1457c8996SThomas Gleixner // SPDX-License-Identifier: GPL-2.0-only 21da177e4SLinus Torvalds /* 31da177e4SLinus Torvalds * linux/fs/nfs/dir.c 41da177e4SLinus Torvalds * 51da177e4SLinus Torvalds * Copyright (C) 1992 Rick Sladkey 61da177e4SLinus Torvalds * 71da177e4SLinus Torvalds * nfs directory handling functions 81da177e4SLinus Torvalds * 91da177e4SLinus Torvalds * 10 Apr 1996 Added silly rename for unlink --okir 101da177e4SLinus Torvalds * 28 Sep 1996 Improved directory cache --okir 111da177e4SLinus Torvalds * 23 Aug 1997 Claus Heine claus@momo.math.rwth-aachen.de 121da177e4SLinus Torvalds * Re-implemented silly rename for unlink, newly implemented 131da177e4SLinus Torvalds * silly rename for nfs_rename() following the suggestions 141da177e4SLinus Torvalds * of Olaf Kirch (okir) found in this file. 151da177e4SLinus Torvalds * Following Linus comments on my original hack, this version 161da177e4SLinus Torvalds * depends only on the dcache stuff and doesn't touch the inode 171da177e4SLinus Torvalds * layer (iput() and friends). 181da177e4SLinus Torvalds * 6 Jun 1999 Cache readdir lookups in the page cache. -DaveM 191da177e4SLinus Torvalds */ 201da177e4SLinus Torvalds 21b6459415SJakub Kicinski #include <linux/compat.h> 22ddda8e0aSBryan Schumaker #include <linux/module.h> 231da177e4SLinus Torvalds #include <linux/time.h> 241da177e4SLinus Torvalds #include <linux/errno.h> 251da177e4SLinus Torvalds #include <linux/stat.h> 261da177e4SLinus Torvalds #include <linux/fcntl.h> 271da177e4SLinus Torvalds #include <linux/string.h> 281da177e4SLinus Torvalds #include <linux/kernel.h> 291da177e4SLinus Torvalds #include <linux/slab.h> 301da177e4SLinus Torvalds #include <linux/mm.h> 311da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 321da177e4SLinus Torvalds #include <linux/nfs_fs.h> 331da177e4SLinus Torvalds #include <linux/nfs_mount.h> 341da177e4SLinus Torvalds #include <linux/pagemap.h> 35873101b3SChuck Lever #include <linux/pagevec.h> 361da177e4SLinus Torvalds #include <linux/namei.h> 3754ceac45SDavid Howells #include <linux/mount.h> 38a0b8cab3SMel Gorman #include <linux/swap.h> 39e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 4004e4bd1cSCatalin Marinas #include <linux/kmemleak.h> 4164c2ce8bSAneesh Kumar K.V #include <linux/xattr.h> 421da177e4SLinus Torvalds 431da177e4SLinus Torvalds #include "delegation.h" 4491d5b470SChuck Lever #include "iostat.h" 454c30d56eSAdrian Bunk #include "internal.h" 46cd9a1c0eSTrond Myklebust #include "fscache.h" 471da177e4SLinus Torvalds 48f4ce1299STrond Myklebust #include "nfstrace.h" 49f4ce1299STrond Myklebust 501da177e4SLinus Torvalds /* #define NFS_DEBUG_VERBOSE 1 */ 511da177e4SLinus Torvalds 521da177e4SLinus Torvalds static int nfs_opendir(struct inode *, struct file *); 53480c2006SBryan Schumaker static int nfs_closedir(struct inode *, struct file *); 5423db8620SAl Viro static int nfs_readdir(struct file *, struct dir_context *); 5502c24a82SJosef Bacik static int nfs_fsync_dir(struct file *, loff_t, loff_t, int); 56f0dd2136STrond Myklebust static loff_t nfs_llseek_dir(struct file *, loff_t, int); 5711de3b11STrond Myklebust static void nfs_readdir_clear_array(struct page*); 581da177e4SLinus Torvalds 594b6f5d20SArjan van de Ven const struct file_operations nfs_dir_operations = { 60f0dd2136STrond Myklebust .llseek = nfs_llseek_dir, 611da177e4SLinus Torvalds .read = generic_read_dir, 6293a6ab7bSTrond Myklebust .iterate_shared = nfs_readdir, 631da177e4SLinus Torvalds .open = nfs_opendir, 64480c2006SBryan Schumaker .release = nfs_closedir, 651da177e4SLinus Torvalds .fsync = nfs_fsync_dir, 661da177e4SLinus Torvalds }; 671da177e4SLinus Torvalds 6811de3b11STrond Myklebust const struct address_space_operations nfs_dir_aops = { 6911de3b11STrond Myklebust .freepage = nfs_readdir_clear_array, 70d1bacf9eSBryan Schumaker }; 71d1bacf9eSBryan Schumaker 72*580f2367STrond Myklebust #define NFS_INIT_DTSIZE PAGE_SIZE 73*580f2367STrond Myklebust 74281f31b2STrond Myklebust static struct nfs_open_dir_context * 75281f31b2STrond Myklebust alloc_nfs_open_dir_context(struct inode *dir) 76480c2006SBryan Schumaker { 77311324adSTrond Myklebust struct nfs_inode *nfsi = NFS_I(dir); 78480c2006SBryan Schumaker struct nfs_open_dir_context *ctx; 79281f31b2STrond Myklebust 80281f31b2STrond Myklebust ctx = kzalloc(sizeof(*ctx), GFP_KERNEL_ACCOUNT); 81480c2006SBryan Schumaker if (ctx != NULL) { 82311324adSTrond Myklebust ctx->attr_gencount = nfsi->attr_gencount; 83*580f2367STrond Myklebust ctx->dtsize = NFS_INIT_DTSIZE; 84311324adSTrond Myklebust spin_lock(&dir->i_lock); 851c341b77STrond Myklebust if (list_empty(&nfsi->open_files) && 861c341b77STrond Myklebust (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)) 87ac46b3d7STrond Myklebust nfs_set_cache_invalid(dir, 88ac46b3d7STrond Myklebust NFS_INO_INVALID_DATA | 89ac46b3d7STrond Myklebust NFS_INO_REVAL_FORCED); 90311324adSTrond Myklebust list_add(&ctx->list, &nfsi->open_files); 91ff81dfb5STrond Myklebust clear_bit(NFS_INO_FORCE_READDIR, &nfsi->flags); 92d1e32ea3STrond Myklebust memcpy(ctx->verf, nfsi->cookieverf, sizeof(ctx->verf)); 93311324adSTrond Myklebust spin_unlock(&dir->i_lock); 94480c2006SBryan Schumaker return ctx; 95480c2006SBryan Schumaker } 960c030806STrond Myklebust return ERR_PTR(-ENOMEM); 970c030806STrond Myklebust } 98480c2006SBryan Schumaker 99311324adSTrond Myklebust static void put_nfs_open_dir_context(struct inode *dir, struct nfs_open_dir_context *ctx) 100480c2006SBryan Schumaker { 101311324adSTrond Myklebust spin_lock(&dir->i_lock); 102311324adSTrond Myklebust list_del(&ctx->list); 103311324adSTrond Myklebust spin_unlock(&dir->i_lock); 104480c2006SBryan Schumaker kfree(ctx); 105480c2006SBryan Schumaker } 106480c2006SBryan Schumaker 1071da177e4SLinus Torvalds /* 1081da177e4SLinus Torvalds * Open file 1091da177e4SLinus Torvalds */ 1101da177e4SLinus Torvalds static int 1111da177e4SLinus Torvalds nfs_opendir(struct inode *inode, struct file *filp) 1121da177e4SLinus Torvalds { 113480c2006SBryan Schumaker int res = 0; 114480c2006SBryan Schumaker struct nfs_open_dir_context *ctx; 1151da177e4SLinus Torvalds 1166de1472fSAl Viro dfprintk(FILE, "NFS: open dir(%pD2)\n", filp); 117cc0dd2d1SChuck Lever 118cc0dd2d1SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSOPEN); 1191e7cb3dcSChuck Lever 12093b8959aSTrond Myklebust ctx = alloc_nfs_open_dir_context(inode); 121480c2006SBryan Schumaker if (IS_ERR(ctx)) { 122480c2006SBryan Schumaker res = PTR_ERR(ctx); 123480c2006SBryan Schumaker goto out; 124480c2006SBryan Schumaker } 125480c2006SBryan Schumaker filp->private_data = ctx; 126480c2006SBryan Schumaker out: 1271da177e4SLinus Torvalds return res; 1281da177e4SLinus Torvalds } 1291da177e4SLinus Torvalds 130480c2006SBryan Schumaker static int 131480c2006SBryan Schumaker nfs_closedir(struct inode *inode, struct file *filp) 132480c2006SBryan Schumaker { 133a455589fSAl Viro put_nfs_open_dir_context(file_inode(filp), filp->private_data); 134480c2006SBryan Schumaker return 0; 135480c2006SBryan Schumaker } 136480c2006SBryan Schumaker 137d1bacf9eSBryan Schumaker struct nfs_cache_array_entry { 138d1bacf9eSBryan Schumaker u64 cookie; 139d1bacf9eSBryan Schumaker u64 ino; 140a52a8a6aSTrond Myklebust const char *name; 141a52a8a6aSTrond Myklebust unsigned int name_len; 1420b26a0bfSTrond Myklebust unsigned char d_type; 143d1bacf9eSBryan Schumaker }; 144d1bacf9eSBryan Schumaker 145d1bacf9eSBryan Schumaker struct nfs_cache_array { 146d09e673fSTrond Myklebust u64 change_attr; 147d1bacf9eSBryan Schumaker u64 last_cookie; 148b1e21c97STrond Myklebust unsigned int size; 149b1e21c97STrond Myklebust unsigned char page_full : 1, 150762567b7STrond Myklebust page_is_eof : 1, 151762567b7STrond Myklebust cookies_are_ordered : 1; 1525601cda8SGustavo A. R. Silva struct nfs_cache_array_entry array[]; 153d1bacf9eSBryan Schumaker }; 154d1bacf9eSBryan Schumaker 1556c981effSTrond Myklebust struct nfs_readdir_descriptor { 1561da177e4SLinus Torvalds struct file *file; 1571da177e4SLinus Torvalds struct page *page; 15823db8620SAl Viro struct dir_context *ctx; 1591f1d4aa4STrond Myklebust pgoff_t page_index; 160*580f2367STrond Myklebust pgoff_t page_index_max; 1612e7a4641STrond Myklebust u64 dir_cookie; 1620aded708STrond Myklebust u64 last_cookie; 1632e7a4641STrond Myklebust u64 dup_cookie; 164f0dd2136STrond Myklebust loff_t current_index; 16559e356a9STrond Myklebust loff_t prev_index; 166d1bacf9eSBryan Schumaker 167b593c09fSTrond Myklebust __be32 verf[NFS_DIR_VERIFIER_SIZE]; 168a1147b82STrond Myklebust unsigned long dir_verifier; 1691f4eab7eSNeil Brown unsigned long timestamp; 1704704f0e2STrond Myklebust unsigned long gencount; 1712e7a4641STrond Myklebust unsigned long attr_gencount; 172d1bacf9eSBryan Schumaker unsigned int cache_entry_index; 173*580f2367STrond Myklebust unsigned int buffer_fills; 174*580f2367STrond Myklebust unsigned int dtsize; 1752e7a4641STrond Myklebust signed char duped; 176a7a3b1e9SBenjamin Coddington bool plus; 177e1d2699bSTrond Myklebust bool eob; 178a7a3b1e9SBenjamin Coddington bool eof; 1796c981effSTrond Myklebust }; 1801da177e4SLinus Torvalds 181*580f2367STrond Myklebust static void nfs_set_dtsize(struct nfs_readdir_descriptor *desc, unsigned int sz) 182*580f2367STrond Myklebust { 183*580f2367STrond Myklebust struct nfs_server *server = NFS_SERVER(file_inode(desc->file)); 184*580f2367STrond Myklebust unsigned int maxsize = server->dtsize; 185*580f2367STrond Myklebust 186*580f2367STrond Myklebust if (sz > maxsize) 187*580f2367STrond Myklebust sz = maxsize; 188*580f2367STrond Myklebust if (sz < NFS_MIN_FILE_IO_SIZE) 189*580f2367STrond Myklebust sz = NFS_MIN_FILE_IO_SIZE; 190*580f2367STrond Myklebust desc->dtsize = sz; 191*580f2367STrond Myklebust } 192*580f2367STrond Myklebust 193*580f2367STrond Myklebust static void nfs_shrink_dtsize(struct nfs_readdir_descriptor *desc) 194*580f2367STrond Myklebust { 195*580f2367STrond Myklebust nfs_set_dtsize(desc, desc->dtsize >> 1); 196*580f2367STrond Myklebust } 197*580f2367STrond Myklebust 198*580f2367STrond Myklebust static void nfs_grow_dtsize(struct nfs_readdir_descriptor *desc) 199*580f2367STrond Myklebust { 200*580f2367STrond Myklebust nfs_set_dtsize(desc, desc->dtsize << 1); 201*580f2367STrond Myklebust } 202*580f2367STrond Myklebust 2031f1d4aa4STrond Myklebust static void nfs_readdir_array_init(struct nfs_cache_array *array) 2041f1d4aa4STrond Myklebust { 2051f1d4aa4STrond Myklebust memset(array, 0, sizeof(struct nfs_cache_array)); 2061f1d4aa4STrond Myklebust } 2071f1d4aa4STrond Myklebust 208d09e673fSTrond Myklebust static void nfs_readdir_page_init_array(struct page *page, u64 last_cookie, 209d09e673fSTrond Myklebust u64 change_attr) 2104b310319STrond Myklebust { 2114b310319STrond Myklebust struct nfs_cache_array *array; 2124b310319STrond Myklebust 2134b310319STrond Myklebust array = kmap_atomic(page); 2141f1d4aa4STrond Myklebust nfs_readdir_array_init(array); 215d09e673fSTrond Myklebust array->change_attr = change_attr; 2161f1d4aa4STrond Myklebust array->last_cookie = last_cookie; 217762567b7STrond Myklebust array->cookies_are_ordered = 1; 2184b310319STrond Myklebust kunmap_atomic(array); 2194b310319STrond Myklebust } 2204b310319STrond Myklebust 221d1bacf9eSBryan Schumaker /* 222d1bacf9eSBryan Schumaker * we are freeing strings created by nfs_add_to_readdir_array() 223d1bacf9eSBryan Schumaker */ 224d1bacf9eSBryan Schumaker static 22511de3b11STrond Myklebust void nfs_readdir_clear_array(struct page *page) 226d1bacf9eSBryan Schumaker { 22711de3b11STrond Myklebust struct nfs_cache_array *array; 228d1bacf9eSBryan Schumaker int i; 2298cd51a0cSTrond Myklebust 2302b86ce2dSCong Wang array = kmap_atomic(page); 231d1bacf9eSBryan Schumaker for (i = 0; i < array->size; i++) 232a52a8a6aSTrond Myklebust kfree(array->array[i].name); 2331f1d4aa4STrond Myklebust nfs_readdir_array_init(array); 2342b86ce2dSCong Wang kunmap_atomic(array); 235d1bacf9eSBryan Schumaker } 236d1bacf9eSBryan Schumaker 23735df59d3STrond Myklebust static struct page * 23835df59d3STrond Myklebust nfs_readdir_page_array_alloc(u64 last_cookie, gfp_t gfp_flags) 23935df59d3STrond Myklebust { 24035df59d3STrond Myklebust struct page *page = alloc_page(gfp_flags); 24135df59d3STrond Myklebust if (page) 242d09e673fSTrond Myklebust nfs_readdir_page_init_array(page, last_cookie, 0); 24335df59d3STrond Myklebust return page; 24435df59d3STrond Myklebust } 24535df59d3STrond Myklebust 24635df59d3STrond Myklebust static void nfs_readdir_page_array_free(struct page *page) 24735df59d3STrond Myklebust { 24835df59d3STrond Myklebust if (page) { 24935df59d3STrond Myklebust nfs_readdir_clear_array(page); 25035df59d3STrond Myklebust put_page(page); 25135df59d3STrond Myklebust } 25235df59d3STrond Myklebust } 25335df59d3STrond Myklebust 254b1e21c97STrond Myklebust static void nfs_readdir_array_set_eof(struct nfs_cache_array *array) 255b1e21c97STrond Myklebust { 256b1e21c97STrond Myklebust array->page_is_eof = 1; 257b1e21c97STrond Myklebust array->page_full = 1; 258b1e21c97STrond Myklebust } 259b1e21c97STrond Myklebust 260b1e21c97STrond Myklebust static bool nfs_readdir_array_is_full(struct nfs_cache_array *array) 261b1e21c97STrond Myklebust { 262b1e21c97STrond Myklebust return array->page_full; 263b1e21c97STrond Myklebust } 264b1e21c97STrond Myklebust 265d1bacf9eSBryan Schumaker /* 266d1bacf9eSBryan Schumaker * the caller is responsible for freeing qstr.name 267d1bacf9eSBryan Schumaker * when called by nfs_readdir_add_to_array, the strings will be freed in 268d1bacf9eSBryan Schumaker * nfs_clear_readdir_array() 269d1bacf9eSBryan Schumaker */ 270a52a8a6aSTrond Myklebust static const char *nfs_readdir_copy_name(const char *name, unsigned int len) 271d1bacf9eSBryan Schumaker { 272a52a8a6aSTrond Myklebust const char *ret = kmemdup_nul(name, len, GFP_KERNEL); 273a52a8a6aSTrond Myklebust 27404e4bd1cSCatalin Marinas /* 27504e4bd1cSCatalin Marinas * Avoid a kmemleak false positive. The pointer to the name is stored 27604e4bd1cSCatalin Marinas * in a page cache page which kmemleak does not scan. 27704e4bd1cSCatalin Marinas */ 278a52a8a6aSTrond Myklebust if (ret != NULL) 279a52a8a6aSTrond Myklebust kmemleak_not_leak(ret); 280a52a8a6aSTrond Myklebust return ret; 281d1bacf9eSBryan Schumaker } 282d1bacf9eSBryan Schumaker 2830b2662b7STrond Myklebust static size_t nfs_readdir_array_maxentries(void) 2840b2662b7STrond Myklebust { 2850b2662b7STrond Myklebust return (PAGE_SIZE - sizeof(struct nfs_cache_array)) / 2860b2662b7STrond Myklebust sizeof(struct nfs_cache_array_entry); 2870b2662b7STrond Myklebust } 2880b2662b7STrond Myklebust 289b1e21c97STrond Myklebust /* 290b1e21c97STrond Myklebust * Check that the next array entry lies entirely within the page bounds 291b1e21c97STrond Myklebust */ 292b1e21c97STrond Myklebust static int nfs_readdir_array_can_expand(struct nfs_cache_array *array) 293b1e21c97STrond Myklebust { 294b1e21c97STrond Myklebust if (array->page_full) 295b1e21c97STrond Myklebust return -ENOSPC; 2960b2662b7STrond Myklebust if (array->size == nfs_readdir_array_maxentries()) { 297b1e21c97STrond Myklebust array->page_full = 1; 298b1e21c97STrond Myklebust return -ENOSPC; 299b1e21c97STrond Myklebust } 300d1bacf9eSBryan Schumaker return 0; 301d1bacf9eSBryan Schumaker } 302d1bacf9eSBryan Schumaker 303d1bacf9eSBryan Schumaker static 304d1bacf9eSBryan Schumaker int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) 305d1bacf9eSBryan Schumaker { 306a52a8a6aSTrond Myklebust struct nfs_cache_array *array; 3074a201d6eSTrond Myklebust struct nfs_cache_array_entry *cache_entry; 308a52a8a6aSTrond Myklebust const char *name; 3094a201d6eSTrond Myklebust int ret; 3104a201d6eSTrond Myklebust 311a52a8a6aSTrond Myklebust name = nfs_readdir_copy_name(entry->name, entry->len); 312a52a8a6aSTrond Myklebust if (!name) 313a52a8a6aSTrond Myklebust return -ENOMEM; 3143020093fSTrond Myklebust 315a52a8a6aSTrond Myklebust array = kmap_atomic(page); 316b1e21c97STrond Myklebust ret = nfs_readdir_array_can_expand(array); 317a52a8a6aSTrond Myklebust if (ret) { 318a52a8a6aSTrond Myklebust kfree(name); 3193020093fSTrond Myklebust goto out; 320a52a8a6aSTrond Myklebust } 3213020093fSTrond Myklebust 322b1e21c97STrond Myklebust cache_entry = &array->array[array->size]; 3234a201d6eSTrond Myklebust cache_entry->cookie = entry->prev_cookie; 3244a201d6eSTrond Myklebust cache_entry->ino = entry->ino; 3250b26a0bfSTrond Myklebust cache_entry->d_type = entry->d_type; 326a52a8a6aSTrond Myklebust cache_entry->name_len = entry->len; 327a52a8a6aSTrond Myklebust cache_entry->name = name; 328d1bacf9eSBryan Schumaker array->last_cookie = entry->cookie; 329762567b7STrond Myklebust if (array->last_cookie <= cache_entry->cookie) 330762567b7STrond Myklebust array->cookies_are_ordered = 0; 3318cd51a0cSTrond Myklebust array->size++; 33247c716cbSTrond Myklebust if (entry->eof != 0) 333b1e21c97STrond Myklebust nfs_readdir_array_set_eof(array); 3344a201d6eSTrond Myklebust out: 335a52a8a6aSTrond Myklebust kunmap_atomic(array); 3364a201d6eSTrond Myklebust return ret; 337d1bacf9eSBryan Schumaker } 338d1bacf9eSBryan Schumaker 339d09e673fSTrond Myklebust static bool nfs_readdir_page_validate(struct page *page, u64 last_cookie, 340d09e673fSTrond Myklebust u64 change_attr) 341d09e673fSTrond Myklebust { 342d09e673fSTrond Myklebust struct nfs_cache_array *array = kmap_atomic(page); 343d09e673fSTrond Myklebust int ret = true; 344d09e673fSTrond Myklebust 345d09e673fSTrond Myklebust if (array->change_attr != change_attr) 346d09e673fSTrond Myklebust ret = false; 347d09e673fSTrond Myklebust if (array->size > 0 && array->array[0].cookie != last_cookie) 348d09e673fSTrond Myklebust ret = false; 349d09e673fSTrond Myklebust kunmap_atomic(array); 350d09e673fSTrond Myklebust return ret; 351d09e673fSTrond Myklebust } 352d09e673fSTrond Myklebust 353d09e673fSTrond Myklebust static void nfs_readdir_page_unlock_and_put(struct page *page) 354d09e673fSTrond Myklebust { 355d09e673fSTrond Myklebust unlock_page(page); 356d09e673fSTrond Myklebust put_page(page); 357d09e673fSTrond Myklebust } 358d09e673fSTrond Myklebust 3591f1d4aa4STrond Myklebust static struct page *nfs_readdir_page_get_locked(struct address_space *mapping, 3601f1d4aa4STrond Myklebust pgoff_t index, u64 last_cookie) 3611f1d4aa4STrond Myklebust { 3621f1d4aa4STrond Myklebust struct page *page; 363d09e673fSTrond Myklebust u64 change_attr; 3641f1d4aa4STrond Myklebust 3651f1d4aa4STrond Myklebust page = grab_cache_page(mapping, index); 366d09e673fSTrond Myklebust if (!page) 367d09e673fSTrond Myklebust return NULL; 368d09e673fSTrond Myklebust change_attr = inode_peek_iversion_raw(mapping->host); 369d09e673fSTrond Myklebust if (PageUptodate(page)) { 370d09e673fSTrond Myklebust if (nfs_readdir_page_validate(page, last_cookie, change_attr)) 371d09e673fSTrond Myklebust return page; 372d09e673fSTrond Myklebust nfs_readdir_clear_array(page); 3731f1d4aa4STrond Myklebust } 374d09e673fSTrond Myklebust nfs_readdir_page_init_array(page, last_cookie, change_attr); 375d09e673fSTrond Myklebust SetPageUptodate(page); 3761f1d4aa4STrond Myklebust return page; 3771f1d4aa4STrond Myklebust } 3781f1d4aa4STrond Myklebust 3790b2662b7STrond Myklebust static loff_t nfs_readdir_page_offset(struct page *page) 3800b2662b7STrond Myklebust { 3810b2662b7STrond Myklebust return (loff_t)page->index * (loff_t)nfs_readdir_array_maxentries(); 3820b2662b7STrond Myklebust } 3830b2662b7STrond Myklebust 3841f1d4aa4STrond Myklebust static u64 nfs_readdir_page_last_cookie(struct page *page) 3851f1d4aa4STrond Myklebust { 3861f1d4aa4STrond Myklebust struct nfs_cache_array *array; 3871f1d4aa4STrond Myklebust u64 ret; 3881f1d4aa4STrond Myklebust 3891f1d4aa4STrond Myklebust array = kmap_atomic(page); 3901f1d4aa4STrond Myklebust ret = array->last_cookie; 3911f1d4aa4STrond Myklebust kunmap_atomic(array); 3921f1d4aa4STrond Myklebust return ret; 3931f1d4aa4STrond Myklebust } 3941f1d4aa4STrond Myklebust 3951f1d4aa4STrond Myklebust static bool nfs_readdir_page_needs_filling(struct page *page) 3961f1d4aa4STrond Myklebust { 3971f1d4aa4STrond Myklebust struct nfs_cache_array *array; 3981f1d4aa4STrond Myklebust bool ret; 3991f1d4aa4STrond Myklebust 4001f1d4aa4STrond Myklebust array = kmap_atomic(page); 4011f1d4aa4STrond Myklebust ret = !nfs_readdir_array_is_full(array); 4021f1d4aa4STrond Myklebust kunmap_atomic(array); 4031f1d4aa4STrond Myklebust return ret; 4041f1d4aa4STrond Myklebust } 4051f1d4aa4STrond Myklebust 406b1e21c97STrond Myklebust static void nfs_readdir_page_set_eof(struct page *page) 407b1e21c97STrond Myklebust { 408b1e21c97STrond Myklebust struct nfs_cache_array *array; 409b1e21c97STrond Myklebust 410b1e21c97STrond Myklebust array = kmap_atomic(page); 411b1e21c97STrond Myklebust nfs_readdir_array_set_eof(array); 412b1e21c97STrond Myklebust kunmap_atomic(array); 413b1e21c97STrond Myklebust } 414b1e21c97STrond Myklebust 4153b2a09f1STrond Myklebust static struct page *nfs_readdir_page_get_next(struct address_space *mapping, 4163b2a09f1STrond Myklebust pgoff_t index, u64 cookie) 4173b2a09f1STrond Myklebust { 4183b2a09f1STrond Myklebust struct page *page; 4193b2a09f1STrond Myklebust 4203b2a09f1STrond Myklebust page = nfs_readdir_page_get_locked(mapping, index, cookie); 4213b2a09f1STrond Myklebust if (page) { 4223b2a09f1STrond Myklebust if (nfs_readdir_page_last_cookie(page) == cookie) 4233b2a09f1STrond Myklebust return page; 4243b2a09f1STrond Myklebust nfs_readdir_page_unlock_and_put(page); 4253b2a09f1STrond Myklebust } 4263b2a09f1STrond Myklebust return NULL; 4273b2a09f1STrond Myklebust } 4283b2a09f1STrond Myklebust 42959e356a9STrond Myklebust static inline 43059e356a9STrond Myklebust int is_32bit_api(void) 43159e356a9STrond Myklebust { 43259e356a9STrond Myklebust #ifdef CONFIG_COMPAT 43359e356a9STrond Myklebust return in_compat_syscall(); 43459e356a9STrond Myklebust #else 43559e356a9STrond Myklebust return (BITS_PER_LONG == 32); 43659e356a9STrond Myklebust #endif 43759e356a9STrond Myklebust } 43859e356a9STrond Myklebust 43959e356a9STrond Myklebust static 44059e356a9STrond Myklebust bool nfs_readdir_use_cookie(const struct file *filp) 44159e356a9STrond Myklebust { 44259e356a9STrond Myklebust if ((filp->f_mode & FMODE_32BITHASH) || 44359e356a9STrond Myklebust (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) 44459e356a9STrond Myklebust return false; 44559e356a9STrond Myklebust return true; 44659e356a9STrond Myklebust } 44759e356a9STrond Myklebust 448c8f0523bSTrond Myklebust static void nfs_readdir_seek_next_array(struct nfs_cache_array *array, 449c8f0523bSTrond Myklebust struct nfs_readdir_descriptor *desc) 450c8f0523bSTrond Myklebust { 451c8f0523bSTrond Myklebust if (array->page_full) { 452c8f0523bSTrond Myklebust desc->last_cookie = array->last_cookie; 453c8f0523bSTrond Myklebust desc->current_index += array->size; 454c8f0523bSTrond Myklebust desc->cache_entry_index = 0; 455c8f0523bSTrond Myklebust desc->page_index++; 456c8f0523bSTrond Myklebust } else 457c8f0523bSTrond Myklebust desc->last_cookie = array->array[0].cookie; 458c8f0523bSTrond Myklebust } 459c8f0523bSTrond Myklebust 4606c981effSTrond Myklebust static int nfs_readdir_search_for_pos(struct nfs_cache_array *array, 4616c981effSTrond Myklebust struct nfs_readdir_descriptor *desc) 462d1bacf9eSBryan Schumaker { 46323db8620SAl Viro loff_t diff = desc->ctx->pos - desc->current_index; 464d1bacf9eSBryan Schumaker unsigned int index; 465d1bacf9eSBryan Schumaker 466d1bacf9eSBryan Schumaker if (diff < 0) 467d1bacf9eSBryan Schumaker goto out_eof; 468d1bacf9eSBryan Schumaker if (diff >= array->size) { 469b1e21c97STrond Myklebust if (array->page_is_eof) 470d1bacf9eSBryan Schumaker goto out_eof; 471c8f0523bSTrond Myklebust nfs_readdir_seek_next_array(array, desc); 472d1bacf9eSBryan Schumaker return -EAGAIN; 473d1bacf9eSBryan Schumaker } 474d1bacf9eSBryan Schumaker 475d1bacf9eSBryan Schumaker index = (unsigned int)diff; 4762e7a4641STrond Myklebust desc->dir_cookie = array->array[index].cookie; 477d1bacf9eSBryan Schumaker desc->cache_entry_index = index; 478d1bacf9eSBryan Schumaker return 0; 479d1bacf9eSBryan Schumaker out_eof: 4806089dd0dSThomas Meyer desc->eof = true; 481d1bacf9eSBryan Schumaker return -EBADCOOKIE; 482d1bacf9eSBryan Schumaker } 483d1bacf9eSBryan Schumaker 484762567b7STrond Myklebust static bool nfs_readdir_array_cookie_in_range(struct nfs_cache_array *array, 485762567b7STrond Myklebust u64 cookie) 486762567b7STrond Myklebust { 487762567b7STrond Myklebust if (!array->cookies_are_ordered) 488762567b7STrond Myklebust return true; 489762567b7STrond Myklebust /* Optimisation for monotonically increasing cookies */ 490762567b7STrond Myklebust if (cookie >= array->last_cookie) 491762567b7STrond Myklebust return false; 492762567b7STrond Myklebust if (array->size && cookie < array->array[0].cookie) 493762567b7STrond Myklebust return false; 494762567b7STrond Myklebust return true; 495762567b7STrond Myklebust } 496762567b7STrond Myklebust 4976c981effSTrond Myklebust static int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, 4986c981effSTrond Myklebust struct nfs_readdir_descriptor *desc) 499d1bacf9eSBryan Schumaker { 500d1bacf9eSBryan Schumaker int i; 5018ef2ce3eSBryan Schumaker loff_t new_pos; 502d1bacf9eSBryan Schumaker int status = -EAGAIN; 503d1bacf9eSBryan Schumaker 504762567b7STrond Myklebust if (!nfs_readdir_array_cookie_in_range(array, desc->dir_cookie)) 505762567b7STrond Myklebust goto check_eof; 506762567b7STrond Myklebust 507d1bacf9eSBryan Schumaker for (i = 0; i < array->size; i++) { 5082e7a4641STrond Myklebust if (array->array[i].cookie == desc->dir_cookie) { 509496ad9aaSAl Viro struct nfs_inode *nfsi = NFS_I(file_inode(desc->file)); 5100c030806STrond Myklebust 5110b2662b7STrond Myklebust new_pos = nfs_readdir_page_offset(desc->page) + i; 512d09e673fSTrond Myklebust if (desc->attr_gencount != nfsi->attr_gencount) { 5132e7a4641STrond Myklebust desc->duped = 0; 5142e7a4641STrond Myklebust desc->attr_gencount = nfsi->attr_gencount; 51559e356a9STrond Myklebust } else if (new_pos < desc->prev_index) { 5162e7a4641STrond Myklebust if (desc->duped > 0 5172e7a4641STrond Myklebust && desc->dup_cookie == desc->dir_cookie) { 5180c030806STrond Myklebust if (printk_ratelimit()) { 5196de1472fSAl Viro pr_notice("NFS: directory %pD2 contains a readdir loop." 5200c030806STrond Myklebust "Please contact your server vendor. " 521a52a8a6aSTrond Myklebust "The file: %s has duplicate cookie %llu\n", 522a52a8a6aSTrond Myklebust desc->file, array->array[i].name, desc->dir_cookie); 5230c030806STrond Myklebust } 5240c030806STrond Myklebust status = -ELOOP; 5250c030806STrond Myklebust goto out; 5260c030806STrond Myklebust } 5272e7a4641STrond Myklebust desc->dup_cookie = desc->dir_cookie; 5282e7a4641STrond Myklebust desc->duped = -1; 5298ef2ce3eSBryan Schumaker } 53059e356a9STrond Myklebust if (nfs_readdir_use_cookie(desc->file)) 5312e7a4641STrond Myklebust desc->ctx->pos = desc->dir_cookie; 53259e356a9STrond Myklebust else 53323db8620SAl Viro desc->ctx->pos = new_pos; 53459e356a9STrond Myklebust desc->prev_index = new_pos; 5358cd51a0cSTrond Myklebust desc->cache_entry_index = i; 53647c716cbSTrond Myklebust return 0; 5378cd51a0cSTrond Myklebust } 5388cd51a0cSTrond Myklebust } 539762567b7STrond Myklebust check_eof: 540b1e21c97STrond Myklebust if (array->page_is_eof) { 541d1bacf9eSBryan Schumaker status = -EBADCOOKIE; 5422e7a4641STrond Myklebust if (desc->dir_cookie == array->last_cookie) 5436089dd0dSThomas Meyer desc->eof = true; 544c8f0523bSTrond Myklebust } else 545c8f0523bSTrond Myklebust nfs_readdir_seek_next_array(array, desc); 5460c030806STrond Myklebust out: 547d1bacf9eSBryan Schumaker return status; 548d1bacf9eSBryan Schumaker } 549d1bacf9eSBryan Schumaker 5506c981effSTrond Myklebust static int nfs_readdir_search_array(struct nfs_readdir_descriptor *desc) 551d1bacf9eSBryan Schumaker { 552d1bacf9eSBryan Schumaker struct nfs_cache_array *array; 55347c716cbSTrond Myklebust int status; 554d1bacf9eSBryan Schumaker 555ed09222dSTrond Myklebust array = kmap_atomic(desc->page); 556d1bacf9eSBryan Schumaker 5572e7a4641STrond Myklebust if (desc->dir_cookie == 0) 558d1bacf9eSBryan Schumaker status = nfs_readdir_search_for_pos(array, desc); 559d1bacf9eSBryan Schumaker else 560d1bacf9eSBryan Schumaker status = nfs_readdir_search_for_cookie(array, desc); 561d1bacf9eSBryan Schumaker 562ed09222dSTrond Myklebust kunmap_atomic(array); 563d1bacf9eSBryan Schumaker return status; 564d1bacf9eSBryan Schumaker } 565d1bacf9eSBryan Schumaker 566d1bacf9eSBryan Schumaker /* Fill a page with xdr information before transferring to the cache page */ 56793b8959aSTrond Myklebust static int nfs_readdir_xdr_filler(struct nfs_readdir_descriptor *desc, 568b593c09fSTrond Myklebust __be32 *verf, u64 cookie, 569b593c09fSTrond Myklebust struct page **pages, size_t bufsize, 570b593c09fSTrond Myklebust __be32 *verf_res) 571d1bacf9eSBryan Schumaker { 57282e22a5eSTrond Myklebust struct inode *inode = file_inode(desc->file); 57382e22a5eSTrond Myklebust struct nfs_readdir_arg arg = { 57482e22a5eSTrond Myklebust .dentry = file_dentry(desc->file), 57582e22a5eSTrond Myklebust .cred = desc->file->f_cred, 576b593c09fSTrond Myklebust .verf = verf, 57782e22a5eSTrond Myklebust .cookie = cookie, 57882e22a5eSTrond Myklebust .pages = pages, 57982e22a5eSTrond Myklebust .page_len = bufsize, 58082e22a5eSTrond Myklebust .plus = desc->plus, 58182e22a5eSTrond Myklebust }; 58282e22a5eSTrond Myklebust struct nfs_readdir_res res = { 58382e22a5eSTrond Myklebust .verf = verf_res, 58482e22a5eSTrond Myklebust }; 5854704f0e2STrond Myklebust unsigned long timestamp, gencount; 5861da177e4SLinus Torvalds int error; 5871da177e4SLinus Torvalds 5881da177e4SLinus Torvalds again: 5891da177e4SLinus Torvalds timestamp = jiffies; 5904704f0e2STrond Myklebust gencount = nfs_inc_attr_generation_counter(); 591a1147b82STrond Myklebust desc->dir_verifier = nfs_save_change_attribute(inode); 59282e22a5eSTrond Myklebust error = NFS_PROTO(inode)->readdir(&arg, &res); 5931da177e4SLinus Torvalds if (error < 0) { 5941da177e4SLinus Torvalds /* We requested READDIRPLUS, but the server doesn't grok it */ 5951da177e4SLinus Torvalds if (error == -ENOTSUPP && desc->plus) { 5961da177e4SLinus Torvalds NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; 5973a10c30aSBenny Halevy clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); 59882e22a5eSTrond Myklebust desc->plus = arg.plus = false; 5991da177e4SLinus Torvalds goto again; 6001da177e4SLinus Torvalds } 6011da177e4SLinus Torvalds goto error; 6021da177e4SLinus Torvalds } 6031f4eab7eSNeil Brown desc->timestamp = timestamp; 6044704f0e2STrond Myklebust desc->gencount = gencount; 605d1bacf9eSBryan Schumaker error: 606d1bacf9eSBryan Schumaker return error; 607d1bacf9eSBryan Schumaker } 608d1bacf9eSBryan Schumaker 6096c981effSTrond Myklebust static int xdr_decode(struct nfs_readdir_descriptor *desc, 610573c4e1eSChuck Lever struct nfs_entry *entry, struct xdr_stream *xdr) 611d1bacf9eSBryan Schumaker { 61259e356a9STrond Myklebust struct inode *inode = file_inode(desc->file); 613573c4e1eSChuck Lever int error; 614d1bacf9eSBryan Schumaker 61559e356a9STrond Myklebust error = NFS_PROTO(inode)->decode_dirent(xdr, entry, desc->plus); 616573c4e1eSChuck Lever if (error) 617573c4e1eSChuck Lever return error; 618d1bacf9eSBryan Schumaker entry->fattr->time_start = desc->timestamp; 619d1bacf9eSBryan Schumaker entry->fattr->gencount = desc->gencount; 620d1bacf9eSBryan Schumaker return 0; 621d1bacf9eSBryan Schumaker } 622d1bacf9eSBryan Schumaker 623fa923369STrond Myklebust /* Match file and dirent using either filehandle or fileid 624fa923369STrond Myklebust * Note: caller is responsible for checking the fsid 625fa923369STrond Myklebust */ 626d39ab9deSBryan Schumaker static 627d39ab9deSBryan Schumaker int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) 628d39ab9deSBryan Schumaker { 629d8fdb47fSTrond Myklebust struct inode *inode; 630fa923369STrond Myklebust struct nfs_inode *nfsi; 631fa923369STrond Myklebust 6322b0143b5SDavid Howells if (d_really_is_negative(dentry)) 6332b0143b5SDavid Howells return 0; 634fa923369STrond Myklebust 635d8fdb47fSTrond Myklebust inode = d_inode(dentry); 636d8fdb47fSTrond Myklebust if (is_bad_inode(inode) || NFS_STALE(inode)) 637d8fdb47fSTrond Myklebust return 0; 638d8fdb47fSTrond Myklebust 639d8fdb47fSTrond Myklebust nfsi = NFS_I(inode); 6407dc72d5fSTrond Myklebust if (entry->fattr->fileid != nfsi->fileid) 641d39ab9deSBryan Schumaker return 0; 6427dc72d5fSTrond Myklebust if (entry->fh->size && nfs_compare_fh(entry->fh, &nfsi->fh) != 0) 6437dc72d5fSTrond Myklebust return 0; 6447dc72d5fSTrond Myklebust return 1; 645d39ab9deSBryan Schumaker } 646d39ab9deSBryan Schumaker 647d39ab9deSBryan Schumaker static 64823db8620SAl Viro bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx) 649d69ee9b8STrond Myklebust { 650d69ee9b8STrond Myklebust if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) 651d69ee9b8STrond Myklebust return false; 652d69ee9b8STrond Myklebust if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) 653d69ee9b8STrond Myklebust return true; 65423db8620SAl Viro if (ctx->pos == 0) 655d69ee9b8STrond Myklebust return true; 656d69ee9b8STrond Myklebust return false; 657d69ee9b8STrond Myklebust } 658d69ee9b8STrond Myklebust 659d69ee9b8STrond Myklebust /* 66063519fbcSTrond Myklebust * This function is called by the lookup and getattr code to request the 66163519fbcSTrond Myklebust * use of readdirplus to accelerate any future lookups in the same 662d69ee9b8STrond Myklebust * directory. 663d69ee9b8STrond Myklebust */ 664d69ee9b8STrond Myklebust void nfs_advise_use_readdirplus(struct inode *dir) 665d69ee9b8STrond Myklebust { 66663519fbcSTrond Myklebust struct nfs_inode *nfsi = NFS_I(dir); 66763519fbcSTrond Myklebust 66863519fbcSTrond Myklebust if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) && 66963519fbcSTrond Myklebust !list_empty(&nfsi->open_files)) 67063519fbcSTrond Myklebust set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); 671d69ee9b8STrond Myklebust } 672d69ee9b8STrond Myklebust 673311324adSTrond Myklebust /* 674311324adSTrond Myklebust * This function is mainly for use by nfs_getattr(). 675311324adSTrond Myklebust * 676311324adSTrond Myklebust * If this is an 'ls -l', we want to force use of readdirplus. 677311324adSTrond Myklebust * Do this by checking if there is an active file descriptor 678311324adSTrond Myklebust * and calling nfs_advise_use_readdirplus, then forcing a 679311324adSTrond Myklebust * cache flush. 680311324adSTrond Myklebust */ 681311324adSTrond Myklebust void nfs_force_use_readdirplus(struct inode *dir) 682311324adSTrond Myklebust { 68363519fbcSTrond Myklebust struct nfs_inode *nfsi = NFS_I(dir); 68463519fbcSTrond Myklebust 68563519fbcSTrond Myklebust if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) && 68663519fbcSTrond Myklebust !list_empty(&nfsi->open_files)) { 68763519fbcSTrond Myklebust set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); 688ff81dfb5STrond Myklebust set_bit(NFS_INO_FORCE_READDIR, &nfsi->flags); 689311324adSTrond Myklebust } 690311324adSTrond Myklebust } 691311324adSTrond Myklebust 692d69ee9b8STrond Myklebust static 693a1147b82STrond Myklebust void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry, 694a1147b82STrond Myklebust unsigned long dir_verifier) 695d39ab9deSBryan Schumaker { 69626fe5750SLinus Torvalds struct qstr filename = QSTR_INIT(entry->name, entry->len); 6979ac3d3e8SAl Viro DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); 6984a201d6eSTrond Myklebust struct dentry *dentry; 6994a201d6eSTrond Myklebust struct dentry *alias; 700d39ab9deSBryan Schumaker struct inode *inode; 701aa9c2669SDavid Quigley int status; 702d39ab9deSBryan Schumaker 703fa923369STrond Myklebust if (!(entry->fattr->valid & NFS_ATTR_FATTR_FILEID)) 704fa923369STrond Myklebust return; 7056c441c25STrond Myklebust if (!(entry->fattr->valid & NFS_ATTR_FATTR_FSID)) 7066c441c25STrond Myklebust return; 70778d04af4STrond Myklebust if (filename.len == 0) 70878d04af4STrond Myklebust return; 70978d04af4STrond Myklebust /* Validate that the name doesn't contain any illegal '\0' */ 71078d04af4STrond Myklebust if (strnlen(filename.name, filename.len) != filename.len) 71178d04af4STrond Myklebust return; 71278d04af4STrond Myklebust /* ...or '/' */ 71378d04af4STrond Myklebust if (strnchr(filename.name, filename.len, '/')) 71478d04af4STrond Myklebust return; 7154a201d6eSTrond Myklebust if (filename.name[0] == '.') { 7164a201d6eSTrond Myklebust if (filename.len == 1) 7174a201d6eSTrond Myklebust return; 7184a201d6eSTrond Myklebust if (filename.len == 2 && filename.name[1] == '.') 7194a201d6eSTrond Myklebust return; 7204a201d6eSTrond Myklebust } 7218387ff25SLinus Torvalds filename.hash = full_name_hash(parent, filename.name, filename.len); 722d39ab9deSBryan Schumaker 7234a201d6eSTrond Myklebust dentry = d_lookup(parent, &filename); 7249ac3d3e8SAl Viro again: 7259ac3d3e8SAl Viro if (!dentry) { 7269ac3d3e8SAl Viro dentry = d_alloc_parallel(parent, &filename, &wq); 7279ac3d3e8SAl Viro if (IS_ERR(dentry)) 7289ac3d3e8SAl Viro return; 7299ac3d3e8SAl Viro } 7309ac3d3e8SAl Viro if (!d_in_lookup(dentry)) { 7316c441c25STrond Myklebust /* Is there a mountpoint here? If so, just exit */ 7326c441c25STrond Myklebust if (!nfs_fsid_equal(&NFS_SB(dentry->d_sb)->fsid, 7336c441c25STrond Myklebust &entry->fattr->fsid)) 7346c441c25STrond Myklebust goto out; 735d39ab9deSBryan Schumaker if (nfs_same_file(dentry, entry)) { 7367dc72d5fSTrond Myklebust if (!entry->fh->size) 7377dc72d5fSTrond Myklebust goto out; 738a1147b82STrond Myklebust nfs_set_verifier(dentry, dir_verifier); 7392b0143b5SDavid Howells status = nfs_refresh_inode(d_inode(dentry), entry->fattr); 740aa9c2669SDavid Quigley if (!status) 741dd225cb3SAnna Schumaker nfs_setsecurity(d_inode(dentry), entry->fattr); 742d39ab9deSBryan Schumaker goto out; 743d39ab9deSBryan Schumaker } else { 7445542aa2fSEric W. Biederman d_invalidate(dentry); 745d39ab9deSBryan Schumaker dput(dentry); 7469ac3d3e8SAl Viro dentry = NULL; 7479ac3d3e8SAl Viro goto again; 748d39ab9deSBryan Schumaker } 749d39ab9deSBryan Schumaker } 7507dc72d5fSTrond Myklebust if (!entry->fh->size) { 7517dc72d5fSTrond Myklebust d_lookup_done(dentry); 7527dc72d5fSTrond Myklebust goto out; 7537dc72d5fSTrond Myklebust } 754d39ab9deSBryan Schumaker 755cf7ab00aSAnna Schumaker inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); 75641d28bcaSAl Viro alias = d_splice_alias(inode, dentry); 7579ac3d3e8SAl Viro d_lookup_done(dentry); 7589ac3d3e8SAl Viro if (alias) { 759d39ab9deSBryan Schumaker if (IS_ERR(alias)) 760d39ab9deSBryan Schumaker goto out; 7619ac3d3e8SAl Viro dput(dentry); 7629ac3d3e8SAl Viro dentry = alias; 7639ac3d3e8SAl Viro } 764a1147b82STrond Myklebust nfs_set_verifier(dentry, dir_verifier); 765d39ab9deSBryan Schumaker out: 766d39ab9deSBryan Schumaker dput(dentry); 767d39ab9deSBryan Schumaker } 768d39ab9deSBryan Schumaker 769d1bacf9eSBryan Schumaker /* Perform conversion from xdr to cache array */ 7703b2a09f1STrond Myklebust static int nfs_readdir_page_filler(struct nfs_readdir_descriptor *desc, 7713b2a09f1STrond Myklebust struct nfs_entry *entry, 7723b2a09f1STrond Myklebust struct page **xdr_pages, 77335df59d3STrond Myklebust unsigned int buflen, 77435df59d3STrond Myklebust struct page **arrays, 77535df59d3STrond Myklebust size_t narrays) 776d1bacf9eSBryan Schumaker { 7773b2a09f1STrond Myklebust struct address_space *mapping = desc->file->f_mapping; 778babddc72SBryan Schumaker struct xdr_stream stream; 779f7da7a12SBenny Halevy struct xdr_buf buf; 78035df59d3STrond Myklebust struct page *scratch, *new, *page = *arrays; 7815c346854STrond Myklebust int status; 782babddc72SBryan Schumaker 7836650239aSTrond Myklebust scratch = alloc_page(GFP_KERNEL); 7846650239aSTrond Myklebust if (scratch == NULL) 7856650239aSTrond Myklebust return -ENOMEM; 786babddc72SBryan Schumaker 787f7da7a12SBenny Halevy xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); 7880ae4c3e8SChuck Lever xdr_set_scratch_page(&stream, scratch); 78999424380SBryan Schumaker 79099424380SBryan Schumaker do { 791b1db9a40SAnna Schumaker if (entry->fattr->label) 792b1db9a40SAnna Schumaker entry->fattr->label->len = NFS4_MAXLABELLEN; 793d33030e2SJeffrey Mitchell 79499424380SBryan Schumaker status = xdr_decode(desc, entry, &stream); 795972bcdf2STrond Myklebust if (status != 0) 79699424380SBryan Schumaker break; 7975c346854STrond Myklebust 798a7a3b1e9SBenjamin Coddington if (desc->plus) 799a1147b82STrond Myklebust nfs_prime_dcache(file_dentry(desc->file), entry, 800a1147b82STrond Myklebust desc->dir_verifier); 8018cd51a0cSTrond Myklebust 802db531db9SMax Kellermann status = nfs_readdir_add_to_array(entry, page); 8033b2a09f1STrond Myklebust if (status != -ENOSPC) 8043b2a09f1STrond Myklebust continue; 80599424380SBryan Schumaker 80635df59d3STrond Myklebust if (page->mapping != mapping) { 80735df59d3STrond Myklebust if (!--narrays) 8083b2a09f1STrond Myklebust break; 80935df59d3STrond Myklebust new = nfs_readdir_page_array_alloc(entry->prev_cookie, 81035df59d3STrond Myklebust GFP_KERNEL); 81135df59d3STrond Myklebust if (!new) 81235df59d3STrond Myklebust break; 81335df59d3STrond Myklebust arrays++; 81435df59d3STrond Myklebust *arrays = page = new; 815*580f2367STrond Myklebust desc->page_index_max++; 81635df59d3STrond Myklebust } else { 81735df59d3STrond Myklebust new = nfs_readdir_page_get_next(mapping, 81835df59d3STrond Myklebust page->index + 1, 8193b2a09f1STrond Myklebust entry->prev_cookie); 8203b2a09f1STrond Myklebust if (!new) 8213b2a09f1STrond Myklebust break; 82235df59d3STrond Myklebust if (page != *arrays) 8233b2a09f1STrond Myklebust nfs_readdir_page_unlock_and_put(page); 8243b2a09f1STrond Myklebust page = new; 825*580f2367STrond Myklebust desc->page_index_max = new->index; 82656e4ebf8SBryan Schumaker } 8273b2a09f1STrond Myklebust status = nfs_readdir_add_to_array(entry, page); 828972bcdf2STrond Myklebust } while (!status && !entry->eof); 82956e4ebf8SBryan Schumaker 830972bcdf2STrond Myklebust switch (status) { 831972bcdf2STrond Myklebust case -EBADCOOKIE: 832972bcdf2STrond Myklebust if (entry->eof) { 833b1e21c97STrond Myklebust nfs_readdir_page_set_eof(page); 8348cd51a0cSTrond Myklebust status = 0; 83556e4ebf8SBryan Schumaker } 836972bcdf2STrond Myklebust break; 837972bcdf2STrond Myklebust case -ENOSPC: 838972bcdf2STrond Myklebust case -EAGAIN: 839972bcdf2STrond Myklebust status = 0; 840972bcdf2STrond Myklebust break; 841972bcdf2STrond Myklebust } 8426650239aSTrond Myklebust 84335df59d3STrond Myklebust if (page != *arrays) 8443b2a09f1STrond Myklebust nfs_readdir_page_unlock_and_put(page); 8456650239aSTrond Myklebust 8466650239aSTrond Myklebust put_page(scratch); 847d1bacf9eSBryan Schumaker return status; 84856e4ebf8SBryan Schumaker } 84956e4ebf8SBryan Schumaker 8501a34c8c9STrond Myklebust static void nfs_readdir_free_pages(struct page **pages, size_t npages) 85156e4ebf8SBryan Schumaker { 8521a34c8c9STrond Myklebust while (npages--) 8531a34c8c9STrond Myklebust put_page(pages[npages]); 8541a34c8c9STrond Myklebust kfree(pages); 85556e4ebf8SBryan Schumaker } 85656e4ebf8SBryan Schumaker 85756e4ebf8SBryan Schumaker /* 858bf211ca1Szhangliguang * nfs_readdir_alloc_pages() will allocate pages that must be freed with a call 859bf211ca1Szhangliguang * to nfs_readdir_free_pages() 86056e4ebf8SBryan Schumaker */ 8611a34c8c9STrond Myklebust static struct page **nfs_readdir_alloc_pages(size_t npages) 86256e4ebf8SBryan Schumaker { 8631a34c8c9STrond Myklebust struct page **pages; 8641a34c8c9STrond Myklebust size_t i; 86556e4ebf8SBryan Schumaker 8661a34c8c9STrond Myklebust pages = kmalloc_array(npages, sizeof(*pages), GFP_KERNEL); 8671a34c8c9STrond Myklebust if (!pages) 8681a34c8c9STrond Myklebust return NULL; 86956e4ebf8SBryan Schumaker for (i = 0; i < npages; i++) { 87056e4ebf8SBryan Schumaker struct page *page = alloc_page(GFP_KERNEL); 87156e4ebf8SBryan Schumaker if (page == NULL) 87256e4ebf8SBryan Schumaker goto out_freepages; 87356e4ebf8SBryan Schumaker pages[i] = page; 87456e4ebf8SBryan Schumaker } 8751a34c8c9STrond Myklebust return pages; 87656e4ebf8SBryan Schumaker 87756e4ebf8SBryan Schumaker out_freepages: 878c7e9668eSAnna Schumaker nfs_readdir_free_pages(pages, i); 8791a34c8c9STrond Myklebust return NULL; 880d1bacf9eSBryan Schumaker } 881d1bacf9eSBryan Schumaker 8826c981effSTrond Myklebust static int nfs_readdir_xdr_to_array(struct nfs_readdir_descriptor *desc, 88335df59d3STrond Myklebust __be32 *verf_arg, __be32 *verf_res, 88435df59d3STrond Myklebust struct page **arrays, size_t narrays) 885d1bacf9eSBryan Schumaker { 8861a34c8c9STrond Myklebust struct page **pages; 88735df59d3STrond Myklebust struct page *page = *arrays; 8886b75cf9eSTrond Myklebust struct nfs_entry *entry; 8891a34c8c9STrond Myklebust size_t array_size; 890b593c09fSTrond Myklebust struct inode *inode = file_inode(desc->file); 891*580f2367STrond Myklebust unsigned int dtsize = desc->dtsize; 8928cd51a0cSTrond Myklebust int status = -ENOMEM; 893d1bacf9eSBryan Schumaker 8946b75cf9eSTrond Myklebust entry = kzalloc(sizeof(*entry), GFP_KERNEL); 8956b75cf9eSTrond Myklebust if (!entry) 8966b75cf9eSTrond Myklebust return -ENOMEM; 8976b75cf9eSTrond Myklebust entry->cookie = nfs_readdir_page_last_cookie(page); 8986b75cf9eSTrond Myklebust entry->fh = nfs_alloc_fhandle(); 899b1db9a40SAnna Schumaker entry->fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 9006b75cf9eSTrond Myklebust entry->server = NFS_SERVER(inode); 9016b75cf9eSTrond Myklebust if (entry->fh == NULL || entry->fattr == NULL) 902d1bacf9eSBryan Schumaker goto out; 903d1bacf9eSBryan Schumaker 9041a34c8c9STrond Myklebust array_size = (dtsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 9051a34c8c9STrond Myklebust pages = nfs_readdir_alloc_pages(array_size); 9061a34c8c9STrond Myklebust if (!pages) 907b1db9a40SAnna Schumaker goto out; 908d1bacf9eSBryan Schumaker 909d1bacf9eSBryan Schumaker do { 910ac396128STrond Myklebust unsigned int pglen; 911b593c09fSTrond Myklebust status = nfs_readdir_xdr_filler(desc, verf_arg, entry->cookie, 912b593c09fSTrond Myklebust pages, dtsize, 913b593c09fSTrond Myklebust verf_res); 914d1bacf9eSBryan Schumaker if (status < 0) 915d1bacf9eSBryan Schumaker break; 916972bcdf2STrond Myklebust 917ac396128STrond Myklebust pglen = status; 918972bcdf2STrond Myklebust if (pglen == 0) { 919972bcdf2STrond Myklebust nfs_readdir_page_set_eof(page); 9208cd51a0cSTrond Myklebust break; 9218cd51a0cSTrond Myklebust } 922972bcdf2STrond Myklebust 923ee3707aeSNagendra S Tomar verf_arg = verf_res; 924ee3707aeSNagendra S Tomar 92535df59d3STrond Myklebust status = nfs_readdir_page_filler(desc, entry, pages, pglen, 92635df59d3STrond Myklebust arrays, narrays); 927*580f2367STrond Myklebust desc->buffer_fills++; 928d9c4e39cStrondmy@kernel.org } while (!status && nfs_readdir_page_needs_filling(page) && 929d9c4e39cStrondmy@kernel.org page_mapping(page)); 930d1bacf9eSBryan Schumaker 931c7e9668eSAnna Schumaker nfs_readdir_free_pages(pages, array_size); 932d1bacf9eSBryan Schumaker out: 9336b75cf9eSTrond Myklebust nfs_free_fattr(entry->fattr); 9346b75cf9eSTrond Myklebust nfs_free_fhandle(entry->fh); 9356b75cf9eSTrond Myklebust kfree(entry); 936d1bacf9eSBryan Schumaker return status; 937d1bacf9eSBryan Schumaker } 938d1bacf9eSBryan Schumaker 9391f1d4aa4STrond Myklebust static void nfs_readdir_page_put(struct nfs_readdir_descriptor *desc) 9401da177e4SLinus Torvalds { 94109cbfeafSKirill A. Shutemov put_page(desc->page); 9421da177e4SLinus Torvalds desc->page = NULL; 9431da177e4SLinus Torvalds } 9441da177e4SLinus Torvalds 9451f1d4aa4STrond Myklebust static void 9461f1d4aa4STrond Myklebust nfs_readdir_page_unlock_and_put_cached(struct nfs_readdir_descriptor *desc) 9471da177e4SLinus Torvalds { 9481f1d4aa4STrond Myklebust unlock_page(desc->page); 9491f1d4aa4STrond Myklebust nfs_readdir_page_put(desc); 9501f1d4aa4STrond Myklebust } 9511f1d4aa4STrond Myklebust 9521f1d4aa4STrond Myklebust static struct page * 9531f1d4aa4STrond Myklebust nfs_readdir_page_get_cached(struct nfs_readdir_descriptor *desc) 9541f1d4aa4STrond Myklebust { 9551f1d4aa4STrond Myklebust return nfs_readdir_page_get_locked(desc->file->f_mapping, 9561f1d4aa4STrond Myklebust desc->page_index, 9571f1d4aa4STrond Myklebust desc->last_cookie); 9581da177e4SLinus Torvalds } 9591da177e4SLinus Torvalds 9601da177e4SLinus Torvalds /* 961d1bacf9eSBryan Schumaker * Returns 0 if desc->dir_cookie was found on page desc->page_index 962114de382STrond Myklebust * and locks the page to prevent removal from the page cache. 9631da177e4SLinus Torvalds */ 9646c981effSTrond Myklebust static int find_and_lock_cache_page(struct nfs_readdir_descriptor *desc) 965d1bacf9eSBryan Schumaker { 966227823d2SDai Ngo struct inode *inode = file_inode(desc->file); 967227823d2SDai Ngo struct nfs_inode *nfsi = NFS_I(inode); 968b593c09fSTrond Myklebust __be32 verf[NFS_DIR_VERIFIER_SIZE]; 969d1bacf9eSBryan Schumaker int res; 970d1bacf9eSBryan Schumaker 9711f1d4aa4STrond Myklebust desc->page = nfs_readdir_page_get_cached(desc); 9721f1d4aa4STrond Myklebust if (!desc->page) 9731f1d4aa4STrond Myklebust return -ENOMEM; 9741f1d4aa4STrond Myklebust if (nfs_readdir_page_needs_filling(desc->page)) { 975*580f2367STrond Myklebust /* Grow the dtsize if we had to go back for more pages */ 976*580f2367STrond Myklebust if (desc->page_index == desc->page_index_max) 977*580f2367STrond Myklebust nfs_grow_dtsize(desc); 978*580f2367STrond Myklebust desc->page_index_max = desc->page_index; 97935df59d3STrond Myklebust res = nfs_readdir_xdr_to_array(desc, nfsi->cookieverf, verf, 98035df59d3STrond Myklebust &desc->page, 1); 9819fff59edSTrond Myklebust if (res < 0) { 9829fff59edSTrond Myklebust nfs_readdir_page_unlock_and_put_cached(desc); 9839fff59edSTrond Myklebust if (res == -EBADCOOKIE || res == -ENOTSYNC) { 9849fff59edSTrond Myklebust invalidate_inode_pages2(desc->file->f_mapping); 9859fff59edSTrond Myklebust desc->page_index = 0; 9869fff59edSTrond Myklebust return -EAGAIN; 9879fff59edSTrond Myklebust } 9889fff59edSTrond Myklebust return res; 9899fff59edSTrond Myklebust } 990f892c41cSTrond Myklebust /* 991f892c41cSTrond Myklebust * Set the cookie verifier if the page cache was empty 992f892c41cSTrond Myklebust */ 993f892c41cSTrond Myklebust if (desc->page_index == 0) 994f892c41cSTrond Myklebust memcpy(nfsi->cookieverf, verf, 995f892c41cSTrond Myklebust sizeof(nfsi->cookieverf)); 9961f1d4aa4STrond Myklebust } 997114de382STrond Myklebust res = nfs_readdir_search_array(desc); 998ff81dfb5STrond Myklebust if (res == 0) 999114de382STrond Myklebust return 0; 10001f1d4aa4STrond Myklebust nfs_readdir_page_unlock_and_put_cached(desc); 1001d1bacf9eSBryan Schumaker return res; 1002d1bacf9eSBryan Schumaker } 1003d1bacf9eSBryan Schumaker 1004794092c5STrond Myklebust static bool nfs_readdir_dont_search_cache(struct nfs_readdir_descriptor *desc) 1005794092c5STrond Myklebust { 1006794092c5STrond Myklebust struct address_space *mapping = desc->file->f_mapping; 1007794092c5STrond Myklebust struct inode *dir = file_inode(desc->file); 1008794092c5STrond Myklebust unsigned int dtsize = NFS_SERVER(dir)->dtsize; 1009794092c5STrond Myklebust loff_t size = i_size_read(dir); 1010794092c5STrond Myklebust 1011794092c5STrond Myklebust /* 1012794092c5STrond Myklebust * Default to uncached readdir if the page cache is empty, and 1013794092c5STrond Myklebust * we're looking for a non-zero cookie in a large directory. 1014794092c5STrond Myklebust */ 1015794092c5STrond Myklebust return desc->dir_cookie != 0 && mapping->nrpages == 0 && size > dtsize; 1016794092c5STrond Myklebust } 1017794092c5STrond Myklebust 1018d1bacf9eSBryan Schumaker /* Search for desc->dir_cookie from the beginning of the page cache */ 10196c981effSTrond Myklebust static int readdir_search_pagecache(struct nfs_readdir_descriptor *desc) 10201da177e4SLinus Torvalds { 10218cd51a0cSTrond Myklebust int res; 1022d1bacf9eSBryan Schumaker 1023794092c5STrond Myklebust if (nfs_readdir_dont_search_cache(desc)) 1024794092c5STrond Myklebust return -EBADCOOKIE; 1025794092c5STrond Myklebust 10269fff59edSTrond Myklebust do { 10270aded708STrond Myklebust if (desc->page_index == 0) { 10288cd51a0cSTrond Myklebust desc->current_index = 0; 102959e356a9STrond Myklebust desc->prev_index = 0; 10300aded708STrond Myklebust desc->last_cookie = 0; 10310aded708STrond Myklebust } 1032114de382STrond Myklebust res = find_and_lock_cache_page(desc); 103347c716cbSTrond Myklebust } while (res == -EAGAIN); 10341da177e4SLinus Torvalds return res; 10351da177e4SLinus Torvalds } 10361da177e4SLinus Torvalds 10371da177e4SLinus Torvalds /* 10381da177e4SLinus Torvalds * Once we've found the start of the dirent within a page: fill 'er up... 10391da177e4SLinus Torvalds */ 104013884ff2STrond Myklebust static void nfs_do_filldir(struct nfs_readdir_descriptor *desc, 104113884ff2STrond Myklebust const __be32 *verf) 10421da177e4SLinus Torvalds { 10431da177e4SLinus Torvalds struct file *file = desc->file; 1044dbeaf8c9STrond Myklebust struct nfs_cache_array *array; 1045c8f0523bSTrond Myklebust unsigned int i; 10468ef2ce3eSBryan Schumaker 10470795bf83SFabian Frederick array = kmap(desc->page); 1048d1bacf9eSBryan Schumaker for (i = desc->cache_entry_index; i < array->size; i++) { 1049ece0b423STrond Myklebust struct nfs_cache_array_entry *ent; 10501da177e4SLinus Torvalds 1051ece0b423STrond Myklebust ent = &array->array[i]; 1052a52a8a6aSTrond Myklebust if (!dir_emit(desc->ctx, ent->name, ent->name_len, 105323db8620SAl Viro nfs_compat_user_ino64(ent->ino), ent->d_type)) { 1054e1d2699bSTrond Myklebust desc->eob = true; 10551da177e4SLinus Torvalds break; 1056ece0b423STrond Myklebust } 105713884ff2STrond Myklebust memcpy(desc->verf, verf, sizeof(desc->verf)); 1058c8f0523bSTrond Myklebust if (i == array->size - 1) { 10592e7a4641STrond Myklebust desc->dir_cookie = array->last_cookie; 1060c8f0523bSTrond Myklebust nfs_readdir_seek_next_array(array, desc); 1061c8f0523bSTrond Myklebust } else { 1062c8f0523bSTrond Myklebust desc->dir_cookie = array->array[i + 1].cookie; 1063c8f0523bSTrond Myklebust desc->last_cookie = array->array[0].cookie; 1064c8f0523bSTrond Myklebust } 106559e356a9STrond Myklebust if (nfs_readdir_use_cookie(file)) 10662e7a4641STrond Myklebust desc->ctx->pos = desc->dir_cookie; 106759e356a9STrond Myklebust else 106859e356a9STrond Myklebust desc->ctx->pos++; 10692e7a4641STrond Myklebust if (desc->duped != 0) 10702e7a4641STrond Myklebust desc->duped = 1; 10718cd51a0cSTrond Myklebust } 1072b1e21c97STrond Myklebust if (array->page_is_eof) 1073e1d2699bSTrond Myklebust desc->eof = !desc->eob; 1074d1bacf9eSBryan Schumaker 10750795bf83SFabian Frederick kunmap(desc->page); 1076dbeaf8c9STrond Myklebust dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %llu\n", 1077dbeaf8c9STrond Myklebust (unsigned long long)desc->dir_cookie); 10781da177e4SLinus Torvalds } 10791da177e4SLinus Torvalds 10801da177e4SLinus Torvalds /* 10811da177e4SLinus Torvalds * If we cannot find a cookie in our cache, we suspect that this is 10821da177e4SLinus Torvalds * because it points to a deleted file, so we ask the server to return 10831da177e4SLinus Torvalds * whatever it thinks is the next entry. We then feed this to filldir. 10841da177e4SLinus Torvalds * If all goes well, we should then be able to find our way round the 10851da177e4SLinus Torvalds * cache on the next call to readdir_search_pagecache(); 10861da177e4SLinus Torvalds * 10871da177e4SLinus Torvalds * NOTE: we cannot add the anonymous page to the pagecache because 10881da177e4SLinus Torvalds * the data it contains might not be page aligned. Besides, 10891da177e4SLinus Torvalds * we should already have a complete representation of the 10901da177e4SLinus Torvalds * directory in the page cache by the time we get here. 10911da177e4SLinus Torvalds */ 10926c981effSTrond Myklebust static int uncached_readdir(struct nfs_readdir_descriptor *desc) 10931da177e4SLinus Torvalds { 109435df59d3STrond Myklebust struct page **arrays; 109535df59d3STrond Myklebust size_t i, sz = 512; 1096b593c09fSTrond Myklebust __be32 verf[NFS_DIR_VERIFIER_SIZE]; 109735df59d3STrond Myklebust int status = -ENOMEM; 10981da177e4SLinus Torvalds 109935df59d3STrond Myklebust dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %llu\n", 11002e7a4641STrond Myklebust (unsigned long long)desc->dir_cookie); 11011da177e4SLinus Torvalds 110235df59d3STrond Myklebust arrays = kcalloc(sz, sizeof(*arrays), GFP_KERNEL); 110335df59d3STrond Myklebust if (!arrays) 11041da177e4SLinus Torvalds goto out; 110535df59d3STrond Myklebust arrays[0] = nfs_readdir_page_array_alloc(desc->dir_cookie, GFP_KERNEL); 110635df59d3STrond Myklebust if (!arrays[0]) 110735df59d3STrond Myklebust goto out; 11081da177e4SLinus Torvalds 11097a8e1dc3STrond Myklebust desc->page_index = 0; 1110ce292d8fStrondmy@kernel.org desc->cache_entry_index = 0; 11112e7a4641STrond Myklebust desc->last_cookie = desc->dir_cookie; 11122e7a4641STrond Myklebust desc->duped = 0; 1113*580f2367STrond Myklebust desc->page_index_max = 0; 11147a8e1dc3STrond Myklebust 111535df59d3STrond Myklebust status = nfs_readdir_xdr_to_array(desc, desc->verf, verf, arrays, sz); 1116d1bacf9eSBryan Schumaker 1117e1d2699bSTrond Myklebust for (i = 0; !desc->eob && i < sz && arrays[i]; i++) { 111835df59d3STrond Myklebust desc->page = arrays[i]; 111913884ff2STrond Myklebust nfs_do_filldir(desc, verf); 112035df59d3STrond Myklebust } 112135df59d3STrond Myklebust desc->page = NULL; 11221da177e4SLinus Torvalds 1123*580f2367STrond Myklebust /* 1124*580f2367STrond Myklebust * Grow the dtsize if we have to go back for more pages, 1125*580f2367STrond Myklebust * or shrink it if we're reading too many. 1126*580f2367STrond Myklebust */ 1127*580f2367STrond Myklebust if (!desc->eof) { 1128*580f2367STrond Myklebust if (!desc->eob) 1129*580f2367STrond Myklebust nfs_grow_dtsize(desc); 1130*580f2367STrond Myklebust else if (desc->buffer_fills == 1 && 1131*580f2367STrond Myklebust i < (desc->page_index_max >> 1)) 1132*580f2367STrond Myklebust nfs_shrink_dtsize(desc); 1133*580f2367STrond Myklebust } 113435df59d3STrond Myklebust 113535df59d3STrond Myklebust for (i = 0; i < sz && arrays[i]; i++) 113635df59d3STrond Myklebust nfs_readdir_page_array_free(arrays[i]); 11371da177e4SLinus Torvalds out: 1138*580f2367STrond Myklebust desc->page_index_max = -1; 113935df59d3STrond Myklebust kfree(arrays); 114035df59d3STrond Myklebust dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __func__, status); 11411da177e4SLinus Torvalds return status; 11421da177e4SLinus Torvalds } 11431da177e4SLinus Torvalds 114400a92642SOlivier Galibert /* The file offset position represents the dirent entry number. A 114500a92642SOlivier Galibert last cookie cache takes care of the common case of reading the 114600a92642SOlivier Galibert whole directory. 11471da177e4SLinus Torvalds */ 114823db8620SAl Viro static int nfs_readdir(struct file *file, struct dir_context *ctx) 11491da177e4SLinus Torvalds { 1150be62a1a8SMiklos Szeredi struct dentry *dentry = file_dentry(file); 11512b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 115213884ff2STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 115323db8620SAl Viro struct nfs_open_dir_context *dir_ctx = file->private_data; 11546b75cf9eSTrond Myklebust struct nfs_readdir_descriptor *desc; 1155ff81dfb5STrond Myklebust pgoff_t page_index; 11566b75cf9eSTrond Myklebust int res; 11571da177e4SLinus Torvalds 11586de1472fSAl Viro dfprintk(FILE, "NFS: readdir(%pD2) starting at cookie %llu\n", 11596de1472fSAl Viro file, (long long)ctx->pos); 116091d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); 116191d5b470SChuck Lever 11621da177e4SLinus Torvalds /* 116323db8620SAl Viro * ctx->pos points to the dirent entry number. 1164f0dd2136STrond Myklebust * *desc->dir_cookie has the cookie for the next entry. We have 116500a92642SOlivier Galibert * to either find the entry with the appropriate number or 116600a92642SOlivier Galibert * revalidate the cookie. 11671da177e4SLinus Torvalds */ 1168d09e673fSTrond Myklebust nfs_revalidate_mapping(inode, file->f_mapping); 11696b75cf9eSTrond Myklebust 11706b75cf9eSTrond Myklebust res = -ENOMEM; 11716b75cf9eSTrond Myklebust desc = kzalloc(sizeof(*desc), GFP_KERNEL); 11726b75cf9eSTrond Myklebust if (!desc) 11736b75cf9eSTrond Myklebust goto out; 11746b75cf9eSTrond Myklebust desc->file = file; 11756b75cf9eSTrond Myklebust desc->ctx = ctx; 11766b75cf9eSTrond Myklebust desc->plus = nfs_use_readdirplus(inode, ctx); 1177*580f2367STrond Myklebust desc->page_index_max = -1; 1178fccca7fcSTrond Myklebust 11792e7a4641STrond Myklebust spin_lock(&file->f_lock); 11802e7a4641STrond Myklebust desc->dir_cookie = dir_ctx->dir_cookie; 11812e7a4641STrond Myklebust desc->dup_cookie = dir_ctx->dup_cookie; 11822e7a4641STrond Myklebust desc->duped = dir_ctx->duped; 1183ff81dfb5STrond Myklebust page_index = dir_ctx->page_index; 1184728dd0abSTrond Myklebust desc->page_index = page_index; 1185728dd0abSTrond Myklebust desc->last_cookie = dir_ctx->last_cookie; 11862e7a4641STrond Myklebust desc->attr_gencount = dir_ctx->attr_gencount; 1187e1d2699bSTrond Myklebust desc->eof = dir_ctx->eof; 1188*580f2367STrond Myklebust nfs_set_dtsize(desc, dir_ctx->dtsize); 1189b593c09fSTrond Myklebust memcpy(desc->verf, dir_ctx->verf, sizeof(desc->verf)); 11902e7a4641STrond Myklebust spin_unlock(&file->f_lock); 1191565277f6STrond Myklebust 1192e1d2699bSTrond Myklebust if (desc->eof) { 1193e1d2699bSTrond Myklebust res = 0; 1194e1d2699bSTrond Myklebust goto out_free; 1195e1d2699bSTrond Myklebust } 1196e1d2699bSTrond Myklebust 1197ff81dfb5STrond Myklebust if (test_and_clear_bit(NFS_INO_FORCE_READDIR, &nfsi->flags) && 1198ff81dfb5STrond Myklebust list_is_singular(&nfsi->open_files)) 1199ff81dfb5STrond Myklebust invalidate_mapping_pages(inode->i_mapping, page_index + 1, -1); 1200ff81dfb5STrond Myklebust 120147c716cbSTrond Myklebust do { 12021da177e4SLinus Torvalds res = readdir_search_pagecache(desc); 120300a92642SOlivier Galibert 12041da177e4SLinus Torvalds if (res == -EBADCOOKIE) { 1205ece0b423STrond Myklebust res = 0; 12061da177e4SLinus Torvalds /* This means either end of directory */ 12072e7a4641STrond Myklebust if (desc->dir_cookie && !desc->eof) { 12081da177e4SLinus Torvalds /* Or that the server has 'lost' a cookie */ 120923db8620SAl Viro res = uncached_readdir(desc); 1210ece0b423STrond Myklebust if (res == 0) 12111da177e4SLinus Torvalds continue; 12129fff59edSTrond Myklebust if (res == -EBADCOOKIE || res == -ENOTSYNC) 12139fff59edSTrond Myklebust res = 0; 12141da177e4SLinus Torvalds } 12151da177e4SLinus Torvalds break; 12161da177e4SLinus Torvalds } 12171da177e4SLinus Torvalds if (res == -ETOOSMALL && desc->plus) { 121813884ff2STrond Myklebust clear_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); 12191da177e4SLinus Torvalds nfs_zap_caches(inode); 1220baf57a09STrond Myklebust desc->page_index = 0; 1221a7a3b1e9SBenjamin Coddington desc->plus = false; 1222a7a3b1e9SBenjamin Coddington desc->eof = false; 12231da177e4SLinus Torvalds continue; 12241da177e4SLinus Torvalds } 12251da177e4SLinus Torvalds if (res < 0) 12261da177e4SLinus Torvalds break; 12271da177e4SLinus Torvalds 122813884ff2STrond Myklebust nfs_do_filldir(desc, nfsi->cookieverf); 12291f1d4aa4STrond Myklebust nfs_readdir_page_unlock_and_put_cached(desc); 1230e1d2699bSTrond Myklebust } while (!desc->eob && !desc->eof); 12312e7a4641STrond Myklebust 12322e7a4641STrond Myklebust spin_lock(&file->f_lock); 12332e7a4641STrond Myklebust dir_ctx->dir_cookie = desc->dir_cookie; 12342e7a4641STrond Myklebust dir_ctx->dup_cookie = desc->dup_cookie; 1235728dd0abSTrond Myklebust dir_ctx->last_cookie = desc->last_cookie; 12362e7a4641STrond Myklebust dir_ctx->duped = desc->duped; 12372e7a4641STrond Myklebust dir_ctx->attr_gencount = desc->attr_gencount; 1238ff81dfb5STrond Myklebust dir_ctx->page_index = desc->page_index; 1239e1d2699bSTrond Myklebust dir_ctx->eof = desc->eof; 1240*580f2367STrond Myklebust dir_ctx->dtsize = desc->dtsize; 1241b593c09fSTrond Myklebust memcpy(dir_ctx->verf, desc->verf, sizeof(dir_ctx->verf)); 12422e7a4641STrond Myklebust spin_unlock(&file->f_lock); 1243e1d2699bSTrond Myklebust out_free: 12446b75cf9eSTrond Myklebust kfree(desc); 12456b75cf9eSTrond Myklebust 1246fccca7fcSTrond Myklebust out: 12476de1472fSAl Viro dfprintk(FILE, "NFS: readdir(%pD2) returns %d\n", file, res); 12481da177e4SLinus Torvalds return res; 12491da177e4SLinus Torvalds } 12501da177e4SLinus Torvalds 1251965c8e59SAndrew Morton static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence) 1252f0dd2136STrond Myklebust { 1253480c2006SBryan Schumaker struct nfs_open_dir_context *dir_ctx = filp->private_data; 1254b84e06c5SChuck Lever 12556de1472fSAl Viro dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n", 12566de1472fSAl Viro filp, offset, whence); 1257b84e06c5SChuck Lever 1258965c8e59SAndrew Morton switch (whence) { 1259f0dd2136STrond Myklebust default: 1260b2b1ff3dSTrond Myklebust return -EINVAL; 1261b2b1ff3dSTrond Myklebust case SEEK_SET: 1262b2b1ff3dSTrond Myklebust if (offset < 0) 1263b2b1ff3dSTrond Myklebust return -EINVAL; 126483f2c45eSTrond Myklebust spin_lock(&filp->f_lock); 1265b2b1ff3dSTrond Myklebust break; 1266b2b1ff3dSTrond Myklebust case SEEK_CUR: 1267b2b1ff3dSTrond Myklebust if (offset == 0) 1268b2b1ff3dSTrond Myklebust return filp->f_pos; 126983f2c45eSTrond Myklebust spin_lock(&filp->f_lock); 1270b2b1ff3dSTrond Myklebust offset += filp->f_pos; 1271b2b1ff3dSTrond Myklebust if (offset < 0) { 127283f2c45eSTrond Myklebust spin_unlock(&filp->f_lock); 1273b2b1ff3dSTrond Myklebust return -EINVAL; 1274b2b1ff3dSTrond Myklebust } 1275f0dd2136STrond Myklebust } 1276f0dd2136STrond Myklebust if (offset != filp->f_pos) { 1277f0dd2136STrond Myklebust filp->f_pos = offset; 1278728dd0abSTrond Myklebust if (!nfs_readdir_use_cookie(filp)) { 1279480c2006SBryan Schumaker dir_ctx->dir_cookie = 0; 1280728dd0abSTrond Myklebust dir_ctx->page_index = 0; 1281728dd0abSTrond Myklebust } else 1282728dd0abSTrond Myklebust dir_ctx->dir_cookie = offset; 1283b593c09fSTrond Myklebust if (offset == 0) 1284b593c09fSTrond Myklebust memset(dir_ctx->verf, 0, sizeof(dir_ctx->verf)); 12858ef2ce3eSBryan Schumaker dir_ctx->duped = 0; 1286e1d2699bSTrond Myklebust dir_ctx->eof = false; 1287f0dd2136STrond Myklebust } 128883f2c45eSTrond Myklebust spin_unlock(&filp->f_lock); 1289f0dd2136STrond Myklebust return offset; 1290f0dd2136STrond Myklebust } 1291f0dd2136STrond Myklebust 12921da177e4SLinus Torvalds /* 12931da177e4SLinus Torvalds * All directory operations under NFS are synchronous, so fsync() 12941da177e4SLinus Torvalds * is a dummy operation. 12951da177e4SLinus Torvalds */ 129602c24a82SJosef Bacik static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, 129702c24a82SJosef Bacik int datasync) 12981da177e4SLinus Torvalds { 12996de1472fSAl Viro dfprintk(FILE, "NFS: fsync dir(%pD2) datasync %d\n", filp, datasync); 13001e7cb3dcSChuck Lever 130111decaf8STrond Myklebust nfs_inc_stats(file_inode(filp), NFSIOS_VFSFSYNC); 13021da177e4SLinus Torvalds return 0; 13031da177e4SLinus Torvalds } 13041da177e4SLinus Torvalds 1305bfc69a45STrond Myklebust /** 1306bfc69a45STrond Myklebust * nfs_force_lookup_revalidate - Mark the directory as having changed 1307302fad7bSTrond Myklebust * @dir: pointer to directory inode 1308bfc69a45STrond Myklebust * 1309bfc69a45STrond Myklebust * This forces the revalidation code in nfs_lookup_revalidate() to do a 1310bfc69a45STrond Myklebust * full lookup on all child dentries of 'dir' whenever a change occurs 1311bfc69a45STrond Myklebust * on the server that might have invalidated our dcache. 1312bfc69a45STrond Myklebust * 1313efeda80dSTrond Myklebust * Note that we reserve bit '0' as a tag to let us know when a dentry 1314efeda80dSTrond Myklebust * was revalidated while holding a delegation on its inode. 1315efeda80dSTrond Myklebust * 1316bfc69a45STrond Myklebust * The caller should be holding dir->i_lock 1317bfc69a45STrond Myklebust */ 1318bfc69a45STrond Myklebust void nfs_force_lookup_revalidate(struct inode *dir) 1319bfc69a45STrond Myklebust { 1320efeda80dSTrond Myklebust NFS_I(dir)->cache_change_attribute += 2; 1321bfc69a45STrond Myklebust } 132289d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate); 1323bfc69a45STrond Myklebust 1324efeda80dSTrond Myklebust /** 1325efeda80dSTrond Myklebust * nfs_verify_change_attribute - Detects NFS remote directory changes 1326efeda80dSTrond Myklebust * @dir: pointer to parent directory inode 1327efeda80dSTrond Myklebust * @verf: previously saved change attribute 1328efeda80dSTrond Myklebust * 1329efeda80dSTrond Myklebust * Return "false" if the verifiers doesn't match the change attribute. 1330efeda80dSTrond Myklebust * This would usually indicate that the directory contents have changed on 1331efeda80dSTrond Myklebust * the server, and that any dentries need revalidating. 1332efeda80dSTrond Myklebust */ 1333efeda80dSTrond Myklebust static bool nfs_verify_change_attribute(struct inode *dir, unsigned long verf) 1334efeda80dSTrond Myklebust { 1335efeda80dSTrond Myklebust return (verf & ~1UL) == nfs_save_change_attribute(dir); 1336efeda80dSTrond Myklebust } 1337efeda80dSTrond Myklebust 1338efeda80dSTrond Myklebust static void nfs_set_verifier_delegated(unsigned long *verf) 1339efeda80dSTrond Myklebust { 1340efeda80dSTrond Myklebust *verf |= 1UL; 1341efeda80dSTrond Myklebust } 1342efeda80dSTrond Myklebust 1343efeda80dSTrond Myklebust #if IS_ENABLED(CONFIG_NFS_V4) 1344efeda80dSTrond Myklebust static void nfs_unset_verifier_delegated(unsigned long *verf) 1345efeda80dSTrond Myklebust { 1346efeda80dSTrond Myklebust *verf &= ~1UL; 1347efeda80dSTrond Myklebust } 1348efeda80dSTrond Myklebust #endif /* IS_ENABLED(CONFIG_NFS_V4) */ 1349efeda80dSTrond Myklebust 1350efeda80dSTrond Myklebust static bool nfs_test_verifier_delegated(unsigned long verf) 1351efeda80dSTrond Myklebust { 1352efeda80dSTrond Myklebust return verf & 1; 1353efeda80dSTrond Myklebust } 1354efeda80dSTrond Myklebust 1355efeda80dSTrond Myklebust static bool nfs_verifier_is_delegated(struct dentry *dentry) 1356efeda80dSTrond Myklebust { 1357efeda80dSTrond Myklebust return nfs_test_verifier_delegated(dentry->d_time); 1358efeda80dSTrond Myklebust } 1359efeda80dSTrond Myklebust 1360efeda80dSTrond Myklebust static void nfs_set_verifier_locked(struct dentry *dentry, unsigned long verf) 1361efeda80dSTrond Myklebust { 1362efeda80dSTrond Myklebust struct inode *inode = d_inode(dentry); 1363cec08f45STrond Myklebust struct inode *dir = d_inode(dentry->d_parent); 1364efeda80dSTrond Myklebust 1365cec08f45STrond Myklebust if (!nfs_verify_change_attribute(dir, verf)) 1366cec08f45STrond Myklebust return; 1367efeda80dSTrond Myklebust if (inode && NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1368efeda80dSTrond Myklebust nfs_set_verifier_delegated(&verf); 1369efeda80dSTrond Myklebust dentry->d_time = verf; 1370efeda80dSTrond Myklebust } 1371efeda80dSTrond Myklebust 1372efeda80dSTrond Myklebust /** 1373efeda80dSTrond Myklebust * nfs_set_verifier - save a parent directory verifier in the dentry 1374efeda80dSTrond Myklebust * @dentry: pointer to dentry 1375efeda80dSTrond Myklebust * @verf: verifier to save 1376efeda80dSTrond Myklebust * 1377efeda80dSTrond Myklebust * Saves the parent directory verifier in @dentry. If the inode has 1378efeda80dSTrond Myklebust * a delegation, we also tag the dentry as having been revalidated 1379efeda80dSTrond Myklebust * while holding a delegation so that we know we don't have to 1380efeda80dSTrond Myklebust * look it up again after a directory change. 1381efeda80dSTrond Myklebust */ 1382efeda80dSTrond Myklebust void nfs_set_verifier(struct dentry *dentry, unsigned long verf) 1383efeda80dSTrond Myklebust { 1384efeda80dSTrond Myklebust 1385efeda80dSTrond Myklebust spin_lock(&dentry->d_lock); 1386efeda80dSTrond Myklebust nfs_set_verifier_locked(dentry, verf); 1387efeda80dSTrond Myklebust spin_unlock(&dentry->d_lock); 1388efeda80dSTrond Myklebust } 1389efeda80dSTrond Myklebust EXPORT_SYMBOL_GPL(nfs_set_verifier); 1390efeda80dSTrond Myklebust 1391efeda80dSTrond Myklebust #if IS_ENABLED(CONFIG_NFS_V4) 1392efeda80dSTrond Myklebust /** 1393efeda80dSTrond Myklebust * nfs_clear_verifier_delegated - clear the dir verifier delegation tag 1394efeda80dSTrond Myklebust * @inode: pointer to inode 1395efeda80dSTrond Myklebust * 1396efeda80dSTrond Myklebust * Iterates through the dentries in the inode alias list and clears 1397efeda80dSTrond Myklebust * the tag used to indicate that the dentry has been revalidated 1398efeda80dSTrond Myklebust * while holding a delegation. 1399efeda80dSTrond Myklebust * This function is intended for use when the delegation is being 1400efeda80dSTrond Myklebust * returned or revoked. 1401efeda80dSTrond Myklebust */ 1402efeda80dSTrond Myklebust void nfs_clear_verifier_delegated(struct inode *inode) 1403efeda80dSTrond Myklebust { 1404efeda80dSTrond Myklebust struct dentry *alias; 1405efeda80dSTrond Myklebust 1406efeda80dSTrond Myklebust if (!inode) 1407efeda80dSTrond Myklebust return; 1408efeda80dSTrond Myklebust spin_lock(&inode->i_lock); 1409efeda80dSTrond Myklebust hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) { 1410efeda80dSTrond Myklebust spin_lock(&alias->d_lock); 1411efeda80dSTrond Myklebust nfs_unset_verifier_delegated(&alias->d_time); 1412efeda80dSTrond Myklebust spin_unlock(&alias->d_lock); 1413efeda80dSTrond Myklebust } 1414efeda80dSTrond Myklebust spin_unlock(&inode->i_lock); 1415efeda80dSTrond Myklebust } 1416efeda80dSTrond Myklebust EXPORT_SYMBOL_GPL(nfs_clear_verifier_delegated); 1417efeda80dSTrond Myklebust #endif /* IS_ENABLED(CONFIG_NFS_V4) */ 1418efeda80dSTrond Myklebust 14198ce37abdSTrond Myklebust static int nfs_dentry_verify_change(struct inode *dir, struct dentry *dentry) 14208ce37abdSTrond Myklebust { 14218ce37abdSTrond Myklebust if (nfs_server_capable(dir, NFS_CAP_CASE_INSENSITIVE) && 14228ce37abdSTrond Myklebust d_really_is_negative(dentry)) 14238ce37abdSTrond Myklebust return dentry->d_time == inode_peek_iversion_raw(dir); 14248ce37abdSTrond Myklebust return nfs_verify_change_attribute(dir, dentry->d_time); 14258ce37abdSTrond Myklebust } 14268ce37abdSTrond Myklebust 14271da177e4SLinus Torvalds /* 14281da177e4SLinus Torvalds * A check for whether or not the parent directory has changed. 14291da177e4SLinus Torvalds * In the case it has, we assume that the dentries are untrustworthy 14301da177e4SLinus Torvalds * and may need to be looked up again. 1431912a108dSNeilBrown * If rcu_walk prevents us from performing a full check, return 0. 14321da177e4SLinus Torvalds */ 1433912a108dSNeilBrown static int nfs_check_verifier(struct inode *dir, struct dentry *dentry, 1434912a108dSNeilBrown int rcu_walk) 14351da177e4SLinus Torvalds { 14361da177e4SLinus Torvalds if (IS_ROOT(dentry)) 14371da177e4SLinus Torvalds return 1; 14384eec952eSTrond Myklebust if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 14394eec952eSTrond Myklebust return 0; 14408ce37abdSTrond Myklebust if (!nfs_dentry_verify_change(dir, dentry)) 14416ecc5e8fSTrond Myklebust return 0; 1442f2c77f4eSTrond Myklebust /* Revalidate nfsi->cache_change_attribute before we declare a match */ 14431cd9cb05STrond Myklebust if (nfs_mapping_need_revalidate_inode(dir)) { 1444912a108dSNeilBrown if (rcu_walk) 1445f2c77f4eSTrond Myklebust return 0; 14461cd9cb05STrond Myklebust if (__nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) 14471cd9cb05STrond Myklebust return 0; 14481cd9cb05STrond Myklebust } 14498ce37abdSTrond Myklebust if (!nfs_dentry_verify_change(dir, dentry)) 1450f2c77f4eSTrond Myklebust return 0; 1451f2c77f4eSTrond Myklebust return 1; 14521da177e4SLinus Torvalds } 14531da177e4SLinus Torvalds 14541da177e4SLinus Torvalds /* 1455a12802caSTrond Myklebust * Use intent information to check whether or not we're going to do 1456a12802caSTrond Myklebust * an O_EXCL create using this path component. 1457a12802caSTrond Myklebust */ 1458fa3c56bbSAl Viro static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) 1459a12802caSTrond Myklebust { 1460a12802caSTrond Myklebust if (NFS_PROTO(dir)->version == 2) 1461a12802caSTrond Myklebust return 0; 1462fa3c56bbSAl Viro return flags & LOOKUP_EXCL; 1463a12802caSTrond Myklebust } 1464a12802caSTrond Myklebust 1465a12802caSTrond Myklebust /* 14661d6757fbSTrond Myklebust * Inode and filehandle revalidation for lookups. 14671d6757fbSTrond Myklebust * 14681d6757fbSTrond Myklebust * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, 14691d6757fbSTrond Myklebust * or if the intent information indicates that we're about to open this 14701d6757fbSTrond Myklebust * particular file and the "nocto" mount flag is not set. 14711d6757fbSTrond Myklebust * 14721d6757fbSTrond Myklebust */ 147365a0c149STrond Myklebust static 1474fa3c56bbSAl Viro int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) 14751da177e4SLinus Torvalds { 14761da177e4SLinus Torvalds struct nfs_server *server = NFS_SERVER(inode); 147765a0c149STrond Myklebust int ret; 14781da177e4SLinus Torvalds 147936d43a43SDavid Howells if (IS_AUTOMOUNT(inode)) 14804e99a1ffSTrond Myklebust return 0; 148147921921STrond Myklebust 148247921921STrond Myklebust if (flags & LOOKUP_OPEN) { 148347921921STrond Myklebust switch (inode->i_mode & S_IFMT) { 148447921921STrond Myklebust case S_IFREG: 148547921921STrond Myklebust /* A NFSv4 OPEN will revalidate later */ 148647921921STrond Myklebust if (server->caps & NFS_CAP_ATOMIC_OPEN) 148747921921STrond Myklebust goto out; 1488df561f66SGustavo A. R. Silva fallthrough; 148947921921STrond Myklebust case S_IFDIR: 149047921921STrond Myklebust if (server->flags & NFS_MOUNT_NOCTO) 149147921921STrond Myklebust break; 149247921921STrond Myklebust /* NFS close-to-open cache consistency validation */ 149347921921STrond Myklebust goto out_force; 149447921921STrond Myklebust } 149547921921STrond Myklebust } 149647921921STrond Myklebust 14971da177e4SLinus Torvalds /* VFS wants an on-the-wire revalidation */ 1498fa3c56bbSAl Viro if (flags & LOOKUP_REVAL) 14991da177e4SLinus Torvalds goto out_force; 150065a0c149STrond Myklebust out: 150143245ecaSOlga Kornievskaia if (inode->i_nlink > 0 || 150243245ecaSOlga Kornievskaia (inode->i_nlink == 0 && 150343245ecaSOlga Kornievskaia test_bit(NFS_INO_PRESERVE_UNLINKED, &NFS_I(inode)->flags))) 150443245ecaSOlga Kornievskaia return 0; 150543245ecaSOlga Kornievskaia else 150643245ecaSOlga Kornievskaia return -ESTALE; 15071da177e4SLinus Torvalds out_force: 15081fa1e384SNeilBrown if (flags & LOOKUP_RCU) 15091fa1e384SNeilBrown return -ECHILD; 151065a0c149STrond Myklebust ret = __nfs_revalidate_inode(server, inode); 151165a0c149STrond Myklebust if (ret != 0) 151265a0c149STrond Myklebust return ret; 151365a0c149STrond Myklebust goto out; 15141da177e4SLinus Torvalds } 15151da177e4SLinus Torvalds 151682e7ca13STrond Myklebust static void nfs_mark_dir_for_revalidate(struct inode *inode) 151782e7ca13STrond Myklebust { 151882e7ca13STrond Myklebust spin_lock(&inode->i_lock); 1519a6a361c4STrond Myklebust nfs_set_cache_invalid(inode, NFS_INO_INVALID_CHANGE); 152082e7ca13STrond Myklebust spin_unlock(&inode->i_lock); 152182e7ca13STrond Myklebust } 152282e7ca13STrond Myklebust 15231da177e4SLinus Torvalds /* 15241da177e4SLinus Torvalds * We judge how long we want to trust negative 15251da177e4SLinus Torvalds * dentries by looking at the parent inode mtime. 15261da177e4SLinus Torvalds * 15271da177e4SLinus Torvalds * If parent mtime has changed, we revalidate, else we wait for a 15281da177e4SLinus Torvalds * period corresponding to the parent's attribute cache timeout value. 1529912a108dSNeilBrown * 1530912a108dSNeilBrown * If LOOKUP_RCU prevents us from performing a full check, return 1 1531912a108dSNeilBrown * suggesting a reval is needed. 15329f6d44d4STrond Myklebust * 15339f6d44d4STrond Myklebust * Note that when creating a new file, or looking up a rename target, 15349f6d44d4STrond Myklebust * then it shouldn't be necessary to revalidate a negative dentry. 15351da177e4SLinus Torvalds */ 15361da177e4SLinus Torvalds static inline 15371da177e4SLinus Torvalds int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, 1538fa3c56bbSAl Viro unsigned int flags) 15391da177e4SLinus Torvalds { 15409f6d44d4STrond Myklebust if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) 15411da177e4SLinus Torvalds return 0; 15424eec952eSTrond Myklebust if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) 15434eec952eSTrond Myklebust return 1; 154498ca3ee6STrond Myklebust /* Case insensitive server? Revalidate negative dentries */ 154598ca3ee6STrond Myklebust if (nfs_server_capable(dir, NFS_CAP_CASE_INSENSITIVE)) 154698ca3ee6STrond Myklebust return 1; 1547912a108dSNeilBrown return !nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU); 15481da177e4SLinus Torvalds } 15491da177e4SLinus Torvalds 15505ceb9d7fSTrond Myklebust static int 15515ceb9d7fSTrond Myklebust nfs_lookup_revalidate_done(struct inode *dir, struct dentry *dentry, 15525ceb9d7fSTrond Myklebust struct inode *inode, int error) 15531da177e4SLinus Torvalds { 15545ceb9d7fSTrond Myklebust switch (error) { 15555ceb9d7fSTrond Myklebust case 1: 15562eef8a31STrond Myklebust break; 15575ceb9d7fSTrond Myklebust case 0: 1558a3f432bfSJ. Bruce Fields /* 1559a3f432bfSJ. Bruce Fields * We can't d_drop the root of a disconnected tree: 1560a3f432bfSJ. Bruce Fields * its d_hash is on the s_anon list and d_drop() would hide 1561a3f432bfSJ. Bruce Fields * it from shrink_dcache_for_unmount(), leading to busy 1562a3f432bfSJ. Bruce Fields * inodes on unmount and further oopses. 1563a3f432bfSJ. Bruce Fields */ 156447397915STrond Myklebust if (inode && IS_ROOT(dentry)) 15652eef8a31STrond Myklebust error = 1; 15662eef8a31STrond Myklebust break; 15675ceb9d7fSTrond Myklebust } 15682eef8a31STrond Myklebust trace_nfs_lookup_revalidate_exit(dir, dentry, 0, error); 1569e1fb4d05STrond Myklebust return error; 15701da177e4SLinus Torvalds } 15711da177e4SLinus Torvalds 15725ceb9d7fSTrond Myklebust static int 15735ceb9d7fSTrond Myklebust nfs_lookup_revalidate_negative(struct inode *dir, struct dentry *dentry, 15745ceb9d7fSTrond Myklebust unsigned int flags) 15755ceb9d7fSTrond Myklebust { 15765ceb9d7fSTrond Myklebust int ret = 1; 15775ceb9d7fSTrond Myklebust if (nfs_neg_need_reval(dir, dentry, flags)) { 15785ceb9d7fSTrond Myklebust if (flags & LOOKUP_RCU) 15795ceb9d7fSTrond Myklebust return -ECHILD; 15805ceb9d7fSTrond Myklebust ret = 0; 15815ceb9d7fSTrond Myklebust } 15825ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, NULL, ret); 15835ceb9d7fSTrond Myklebust } 15845ceb9d7fSTrond Myklebust 15855ceb9d7fSTrond Myklebust static int 15865ceb9d7fSTrond Myklebust nfs_lookup_revalidate_delegated(struct inode *dir, struct dentry *dentry, 15875ceb9d7fSTrond Myklebust struct inode *inode) 15885ceb9d7fSTrond Myklebust { 15895ceb9d7fSTrond Myklebust nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 15905ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, inode, 1); 15915ceb9d7fSTrond Myklebust } 15925ceb9d7fSTrond Myklebust 15935ceb9d7fSTrond Myklebust static int 15945ceb9d7fSTrond Myklebust nfs_lookup_revalidate_dentry(struct inode *dir, struct dentry *dentry, 15955ceb9d7fSTrond Myklebust struct inode *inode) 15965ceb9d7fSTrond Myklebust { 15975ceb9d7fSTrond Myklebust struct nfs_fh *fhandle; 15985ceb9d7fSTrond Myklebust struct nfs_fattr *fattr; 1599a1147b82STrond Myklebust unsigned long dir_verifier; 16005ceb9d7fSTrond Myklebust int ret; 16015ceb9d7fSTrond Myklebust 16025ceb9d7fSTrond Myklebust ret = -ENOMEM; 16035ceb9d7fSTrond Myklebust fhandle = nfs_alloc_fhandle(); 16049558a007SAnna Schumaker fattr = nfs_alloc_fattr_with_label(NFS_SERVER(inode)); 16059558a007SAnna Schumaker if (fhandle == NULL || fattr == NULL) 16065ceb9d7fSTrond Myklebust goto out; 16075ceb9d7fSTrond Myklebust 1608a1147b82STrond Myklebust dir_verifier = nfs_save_change_attribute(dir); 16099558a007SAnna Schumaker ret = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr); 16105ceb9d7fSTrond Myklebust if (ret < 0) { 1611f7b37b8bSTrond Myklebust switch (ret) { 1612f7b37b8bSTrond Myklebust case -ESTALE: 1613f7b37b8bSTrond Myklebust case -ENOENT: 16145ceb9d7fSTrond Myklebust ret = 0; 1615f7b37b8bSTrond Myklebust break; 1616f7b37b8bSTrond Myklebust case -ETIMEDOUT: 1617f7b37b8bSTrond Myklebust if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 1618f7b37b8bSTrond Myklebust ret = 1; 1619f7b37b8bSTrond Myklebust } 16205ceb9d7fSTrond Myklebust goto out; 16215ceb9d7fSTrond Myklebust } 16225ceb9d7fSTrond Myklebust ret = 0; 16235ceb9d7fSTrond Myklebust if (nfs_compare_fh(NFS_FH(inode), fhandle)) 16245ceb9d7fSTrond Myklebust goto out; 16255ceb9d7fSTrond Myklebust if (nfs_refresh_inode(inode, fattr) < 0) 16265ceb9d7fSTrond Myklebust goto out; 16275ceb9d7fSTrond Myklebust 1628dd225cb3SAnna Schumaker nfs_setsecurity(inode, fattr); 1629a1147b82STrond Myklebust nfs_set_verifier(dentry, dir_verifier); 16305ceb9d7fSTrond Myklebust 16315ceb9d7fSTrond Myklebust /* set a readdirplus hint that we had a cache miss */ 16325ceb9d7fSTrond Myklebust nfs_force_use_readdirplus(dir); 16335ceb9d7fSTrond Myklebust ret = 1; 16345ceb9d7fSTrond Myklebust out: 16355ceb9d7fSTrond Myklebust nfs_free_fattr(fattr); 16365ceb9d7fSTrond Myklebust nfs_free_fhandle(fhandle); 163782e7ca13STrond Myklebust 163882e7ca13STrond Myklebust /* 163982e7ca13STrond Myklebust * If the lookup failed despite the dentry change attribute being 164082e7ca13STrond Myklebust * a match, then we should revalidate the directory cache. 164182e7ca13STrond Myklebust */ 16428ce37abdSTrond Myklebust if (!ret && nfs_dentry_verify_change(dir, dentry)) 164382e7ca13STrond Myklebust nfs_mark_dir_for_revalidate(dir); 16445ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, inode, ret); 16455ceb9d7fSTrond Myklebust } 16465ceb9d7fSTrond Myklebust 16475ceb9d7fSTrond Myklebust /* 16485ceb9d7fSTrond Myklebust * This is called every time the dcache has a lookup hit, 16495ceb9d7fSTrond Myklebust * and we should check whether we can really trust that 16505ceb9d7fSTrond Myklebust * lookup. 16515ceb9d7fSTrond Myklebust * 16525ceb9d7fSTrond Myklebust * NOTE! The hit can be a negative hit too, don't assume 16535ceb9d7fSTrond Myklebust * we have an inode! 16545ceb9d7fSTrond Myklebust * 16555ceb9d7fSTrond Myklebust * If the parent directory is seen to have changed, we throw out the 16565ceb9d7fSTrond Myklebust * cached dentry and do a new lookup. 16575ceb9d7fSTrond Myklebust */ 16585ceb9d7fSTrond Myklebust static int 16595ceb9d7fSTrond Myklebust nfs_do_lookup_revalidate(struct inode *dir, struct dentry *dentry, 16605ceb9d7fSTrond Myklebust unsigned int flags) 16615ceb9d7fSTrond Myklebust { 16625ceb9d7fSTrond Myklebust struct inode *inode; 16635ceb9d7fSTrond Myklebust int error; 16645ceb9d7fSTrond Myklebust 16655ceb9d7fSTrond Myklebust nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); 16665ceb9d7fSTrond Myklebust inode = d_inode(dentry); 16675ceb9d7fSTrond Myklebust 16685ceb9d7fSTrond Myklebust if (!inode) 16695ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_negative(dir, dentry, flags); 16705ceb9d7fSTrond Myklebust 16715ceb9d7fSTrond Myklebust if (is_bad_inode(inode)) { 16725ceb9d7fSTrond Myklebust dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", 16735ceb9d7fSTrond Myklebust __func__, dentry); 16745ceb9d7fSTrond Myklebust goto out_bad; 16755ceb9d7fSTrond Myklebust } 16765ceb9d7fSTrond Myklebust 1677efeda80dSTrond Myklebust if (nfs_verifier_is_delegated(dentry)) 16785ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_delegated(dir, dentry, inode); 16795ceb9d7fSTrond Myklebust 16805ceb9d7fSTrond Myklebust /* Force a full look up iff the parent directory has changed */ 16815ceb9d7fSTrond Myklebust if (!(flags & (LOOKUP_EXCL | LOOKUP_REVAL)) && 16825ceb9d7fSTrond Myklebust nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) { 16835ceb9d7fSTrond Myklebust error = nfs_lookup_verify_inode(inode, flags); 16845ceb9d7fSTrond Myklebust if (error) { 16855ceb9d7fSTrond Myklebust if (error == -ESTALE) 168682e7ca13STrond Myklebust nfs_mark_dir_for_revalidate(dir); 16875ceb9d7fSTrond Myklebust goto out_bad; 16885ceb9d7fSTrond Myklebust } 16895ceb9d7fSTrond Myklebust nfs_advise_use_readdirplus(dir); 16905ceb9d7fSTrond Myklebust goto out_valid; 16915ceb9d7fSTrond Myklebust } 16925ceb9d7fSTrond Myklebust 16935ceb9d7fSTrond Myklebust if (flags & LOOKUP_RCU) 16945ceb9d7fSTrond Myklebust return -ECHILD; 16955ceb9d7fSTrond Myklebust 16965ceb9d7fSTrond Myklebust if (NFS_STALE(inode)) 16975ceb9d7fSTrond Myklebust goto out_bad; 16985ceb9d7fSTrond Myklebust 16995ceb9d7fSTrond Myklebust trace_nfs_lookup_revalidate_enter(dir, dentry, flags); 17002eef8a31STrond Myklebust return nfs_lookup_revalidate_dentry(dir, dentry, inode); 17015ceb9d7fSTrond Myklebust out_valid: 17025ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, inode, 1); 17035ceb9d7fSTrond Myklebust out_bad: 17045ceb9d7fSTrond Myklebust if (flags & LOOKUP_RCU) 17055ceb9d7fSTrond Myklebust return -ECHILD; 17065ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, inode, 0); 17075ceb9d7fSTrond Myklebust } 17085ceb9d7fSTrond Myklebust 17095ceb9d7fSTrond Myklebust static int 1710c7944ebbSTrond Myklebust __nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags, 1711c7944ebbSTrond Myklebust int (*reval)(struct inode *, struct dentry *, unsigned int)) 17125ceb9d7fSTrond Myklebust { 17135ceb9d7fSTrond Myklebust struct dentry *parent; 17145ceb9d7fSTrond Myklebust struct inode *dir; 17155ceb9d7fSTrond Myklebust int ret; 17165ceb9d7fSTrond Myklebust 17175ceb9d7fSTrond Myklebust if (flags & LOOKUP_RCU) { 17185ceb9d7fSTrond Myklebust parent = READ_ONCE(dentry->d_parent); 17195ceb9d7fSTrond Myklebust dir = d_inode_rcu(parent); 17205ceb9d7fSTrond Myklebust if (!dir) 17215ceb9d7fSTrond Myklebust return -ECHILD; 1722c7944ebbSTrond Myklebust ret = reval(dir, dentry, flags); 17235ceb9d7fSTrond Myklebust if (parent != READ_ONCE(dentry->d_parent)) 17245ceb9d7fSTrond Myklebust return -ECHILD; 17255ceb9d7fSTrond Myklebust } else { 17265ceb9d7fSTrond Myklebust parent = dget_parent(dentry); 1727c7944ebbSTrond Myklebust ret = reval(d_inode(parent), dentry, flags); 17285ceb9d7fSTrond Myklebust dput(parent); 17295ceb9d7fSTrond Myklebust } 17305ceb9d7fSTrond Myklebust return ret; 17315ceb9d7fSTrond Myklebust } 17325ceb9d7fSTrond Myklebust 1733c7944ebbSTrond Myklebust static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) 1734c7944ebbSTrond Myklebust { 1735c7944ebbSTrond Myklebust return __nfs_lookup_revalidate(dentry, flags, nfs_do_lookup_revalidate); 1736c7944ebbSTrond Myklebust } 1737c7944ebbSTrond Myklebust 17381da177e4SLinus Torvalds /* 17392b0143b5SDavid Howells * A weaker form of d_revalidate for revalidating just the d_inode(dentry) 1740ecf3d1f1SJeff Layton * when we don't really care about the dentry name. This is called when a 1741ecf3d1f1SJeff Layton * pathwalk ends on a dentry that was not found via a normal lookup in the 1742ecf3d1f1SJeff Layton * parent dir (e.g.: ".", "..", procfs symlinks or mountpoint traversals). 1743ecf3d1f1SJeff Layton * 1744ecf3d1f1SJeff Layton * In this situation, we just want to verify that the inode itself is OK 1745ecf3d1f1SJeff Layton * since the dentry might have changed on the server. 1746ecf3d1f1SJeff Layton */ 1747ecf3d1f1SJeff Layton static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags) 1748ecf3d1f1SJeff Layton { 17492b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 17509cdd1d3fSTrond Myklebust int error = 0; 1751ecf3d1f1SJeff Layton 1752ecf3d1f1SJeff Layton /* 1753ecf3d1f1SJeff Layton * I believe we can only get a negative dentry here in the case of a 1754ecf3d1f1SJeff Layton * procfs-style symlink. Just assume it's correct for now, but we may 1755ecf3d1f1SJeff Layton * eventually need to do something more here. 1756ecf3d1f1SJeff Layton */ 1757ecf3d1f1SJeff Layton if (!inode) { 17586de1472fSAl Viro dfprintk(LOOKUPCACHE, "%s: %pd2 has negative inode\n", 17596de1472fSAl Viro __func__, dentry); 1760ecf3d1f1SJeff Layton return 1; 1761ecf3d1f1SJeff Layton } 1762ecf3d1f1SJeff Layton 1763ecf3d1f1SJeff Layton if (is_bad_inode(inode)) { 17646de1472fSAl Viro dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", 17656de1472fSAl Viro __func__, dentry); 1766ecf3d1f1SJeff Layton return 0; 1767ecf3d1f1SJeff Layton } 1768ecf3d1f1SJeff Layton 1769b688741cSNeilBrown error = nfs_lookup_verify_inode(inode, flags); 1770ecf3d1f1SJeff Layton dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n", 1771ecf3d1f1SJeff Layton __func__, inode->i_ino, error ? "invalid" : "valid"); 1772ecf3d1f1SJeff Layton return !error; 1773ecf3d1f1SJeff Layton } 1774ecf3d1f1SJeff Layton 1775ecf3d1f1SJeff Layton /* 17761da177e4SLinus Torvalds * This is called from dput() when d_count is going to 0. 17771da177e4SLinus Torvalds */ 1778fe15ce44SNick Piggin static int nfs_dentry_delete(const struct dentry *dentry) 17791da177e4SLinus Torvalds { 17806de1472fSAl Viro dfprintk(VFS, "NFS: dentry_delete(%pd2, %x)\n", 17816de1472fSAl Viro dentry, dentry->d_flags); 17821da177e4SLinus Torvalds 178377f11192STrond Myklebust /* Unhash any dentry with a stale inode */ 17842b0143b5SDavid Howells if (d_really_is_positive(dentry) && NFS_STALE(d_inode(dentry))) 178577f11192STrond Myklebust return 1; 178677f11192STrond Myklebust 17871da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { 17881da177e4SLinus Torvalds /* Unhash it, so that ->d_iput() would be called */ 17891da177e4SLinus Torvalds return 1; 17901da177e4SLinus Torvalds } 17911751e8a6SLinus Torvalds if (!(dentry->d_sb->s_flags & SB_ACTIVE)) { 17921da177e4SLinus Torvalds /* Unhash it, so that ancestors of killed async unlink 17931da177e4SLinus Torvalds * files will be cleaned up during umount */ 17941da177e4SLinus Torvalds return 1; 17951da177e4SLinus Torvalds } 17961da177e4SLinus Torvalds return 0; 17971da177e4SLinus Torvalds 17981da177e4SLinus Torvalds } 17991da177e4SLinus Torvalds 18001f018458STrond Myklebust /* Ensure that we revalidate inode->i_nlink */ 18011b83d707STrond Myklebust static void nfs_drop_nlink(struct inode *inode) 18021b83d707STrond Myklebust { 18031b83d707STrond Myklebust spin_lock(&inode->i_lock); 18041f018458STrond Myklebust /* drop the inode if we're reasonably sure this is the last link */ 180559a707b0STrond Myklebust if (inode->i_nlink > 0) 180659a707b0STrond Myklebust drop_nlink(inode); 180759a707b0STrond Myklebust NFS_I(inode)->attr_gencount = nfs_inc_attr_generation_counter(); 1808ac46b3d7STrond Myklebust nfs_set_cache_invalid( 1809ac46b3d7STrond Myklebust inode, NFS_INO_INVALID_CHANGE | NFS_INO_INVALID_CTIME | 18101301e421STrond Myklebust NFS_INO_INVALID_NLINK); 18111b83d707STrond Myklebust spin_unlock(&inode->i_lock); 18121b83d707STrond Myklebust } 18131b83d707STrond Myklebust 18141da177e4SLinus Torvalds /* 18151da177e4SLinus Torvalds * Called when the dentry loses inode. 18161da177e4SLinus Torvalds * We use it to clean up silly-renamed files. 18171da177e4SLinus Torvalds */ 18181da177e4SLinus Torvalds static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) 18191da177e4SLinus Torvalds { 18201da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { 1821e4eff1a6STrond Myklebust nfs_complete_unlink(dentry, inode); 18221f018458STrond Myklebust nfs_drop_nlink(inode); 18231da177e4SLinus Torvalds } 18241da177e4SLinus Torvalds iput(inode); 18251da177e4SLinus Torvalds } 18261da177e4SLinus Torvalds 1827b1942c5fSAl Viro static void nfs_d_release(struct dentry *dentry) 1828b1942c5fSAl Viro { 1829b1942c5fSAl Viro /* free cached devname value, if it survived that far */ 1830b1942c5fSAl Viro if (unlikely(dentry->d_fsdata)) { 1831b1942c5fSAl Viro if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 1832b1942c5fSAl Viro WARN_ON(1); 1833b1942c5fSAl Viro else 1834b1942c5fSAl Viro kfree(dentry->d_fsdata); 1835b1942c5fSAl Viro } 1836b1942c5fSAl Viro } 1837b1942c5fSAl Viro 1838f786aa90SAl Viro const struct dentry_operations nfs_dentry_operations = { 18391da177e4SLinus Torvalds .d_revalidate = nfs_lookup_revalidate, 1840ecf3d1f1SJeff Layton .d_weak_revalidate = nfs_weak_revalidate, 18411da177e4SLinus Torvalds .d_delete = nfs_dentry_delete, 18421da177e4SLinus Torvalds .d_iput = nfs_dentry_iput, 184336d43a43SDavid Howells .d_automount = nfs_d_automount, 1844b1942c5fSAl Viro .d_release = nfs_d_release, 18451da177e4SLinus Torvalds }; 1846ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_dentry_operations); 18471da177e4SLinus Torvalds 1848597d9289SBryan Schumaker struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) 18491da177e4SLinus Torvalds { 18501da177e4SLinus Torvalds struct dentry *res; 18511da177e4SLinus Torvalds struct inode *inode = NULL; 1852e1fb4d05STrond Myklebust struct nfs_fh *fhandle = NULL; 1853e1fb4d05STrond Myklebust struct nfs_fattr *fattr = NULL; 1854a1147b82STrond Myklebust unsigned long dir_verifier; 18551da177e4SLinus Torvalds int error; 18561da177e4SLinus Torvalds 18576de1472fSAl Viro dfprintk(VFS, "NFS: lookup(%pd2)\n", dentry); 185891d5b470SChuck Lever nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); 18591da177e4SLinus Torvalds 1860130f9ab7SAl Viro if (unlikely(dentry->d_name.len > NFS_SERVER(dir)->namelen)) 1861130f9ab7SAl Viro return ERR_PTR(-ENAMETOOLONG); 18621da177e4SLinus Torvalds 1863fd684071STrond Myklebust /* 1864fd684071STrond Myklebust * If we're doing an exclusive create, optimize away the lookup 1865fd684071STrond Myklebust * but don't hash the dentry. 1866fd684071STrond Myklebust */ 18679f6d44d4STrond Myklebust if (nfs_is_exclusive_create(dir, flags) || flags & LOOKUP_RENAME_TARGET) 1868130f9ab7SAl Viro return NULL; 18691da177e4SLinus Torvalds 1870e1fb4d05STrond Myklebust res = ERR_PTR(-ENOMEM); 1871e1fb4d05STrond Myklebust fhandle = nfs_alloc_fhandle(); 18729558a007SAnna Schumaker fattr = nfs_alloc_fattr_with_label(NFS_SERVER(dir)); 1873e1fb4d05STrond Myklebust if (fhandle == NULL || fattr == NULL) 1874e1fb4d05STrond Myklebust goto out; 1875e1fb4d05STrond Myklebust 1876a1147b82STrond Myklebust dir_verifier = nfs_save_change_attribute(dir); 18776e0d0be7STrond Myklebust trace_nfs_lookup_enter(dir, dentry, flags); 18789558a007SAnna Schumaker error = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr); 18798ce37abdSTrond Myklebust if (error == -ENOENT) { 18808ce37abdSTrond Myklebust if (nfs_server_capable(dir, NFS_CAP_CASE_INSENSITIVE)) 18818ce37abdSTrond Myklebust dir_verifier = inode_peek_iversion_raw(dir); 18821da177e4SLinus Torvalds goto no_entry; 18838ce37abdSTrond Myklebust } 18841da177e4SLinus Torvalds if (error < 0) { 18851da177e4SLinus Torvalds res = ERR_PTR(error); 18869558a007SAnna Schumaker goto out; 18871da177e4SLinus Torvalds } 1888cf7ab00aSAnna Schumaker inode = nfs_fhget(dentry->d_sb, fhandle, fattr); 1889bf0c84f1SNamhyung Kim res = ERR_CAST(inode); 189003f28e3aSTrond Myklebust if (IS_ERR(res)) 18919558a007SAnna Schumaker goto out; 189254ceac45SDavid Howells 189363519fbcSTrond Myklebust /* Notify readdir to use READDIRPLUS */ 189463519fbcSTrond Myklebust nfs_force_use_readdirplus(dir); 1895d69ee9b8STrond Myklebust 18961da177e4SLinus Torvalds no_entry: 189741d28bcaSAl Viro res = d_splice_alias(inode, dentry); 18989eaef27bSTrond Myklebust if (res != NULL) { 18999eaef27bSTrond Myklebust if (IS_ERR(res)) 19009558a007SAnna Schumaker goto out; 19011da177e4SLinus Torvalds dentry = res; 19029eaef27bSTrond Myklebust } 1903a1147b82STrond Myklebust nfs_set_verifier(dentry, dir_verifier); 19041da177e4SLinus Torvalds out: 19059558a007SAnna Schumaker trace_nfs_lookup_exit(dir, dentry, flags, PTR_ERR_OR_ZERO(res)); 1906e1fb4d05STrond Myklebust nfs_free_fattr(fattr); 1907e1fb4d05STrond Myklebust nfs_free_fhandle(fhandle); 19081da177e4SLinus Torvalds return res; 19091da177e4SLinus Torvalds } 1910ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_lookup); 19111da177e4SLinus Torvalds 191200bdadc7STrond Myklebust void nfs_d_prune_case_insensitive_aliases(struct inode *inode) 191300bdadc7STrond Myklebust { 191400bdadc7STrond Myklebust /* Case insensitive server? Revalidate dentries */ 191500bdadc7STrond Myklebust if (inode && nfs_server_capable(inode, NFS_CAP_CASE_INSENSITIVE)) 191600bdadc7STrond Myklebust d_prune_aliases(inode); 191700bdadc7STrond Myklebust } 191800bdadc7STrond Myklebust EXPORT_SYMBOL_GPL(nfs_d_prune_case_insensitive_aliases); 191900bdadc7STrond Myklebust 192089d77c8fSBryan Schumaker #if IS_ENABLED(CONFIG_NFS_V4) 19210b728e19SAl Viro static int nfs4_lookup_revalidate(struct dentry *, unsigned int); 19221da177e4SLinus Torvalds 1923f786aa90SAl Viro const struct dentry_operations nfs4_dentry_operations = { 19240ef97dcfSMiklos Szeredi .d_revalidate = nfs4_lookup_revalidate, 1925b688741cSNeilBrown .d_weak_revalidate = nfs_weak_revalidate, 19261da177e4SLinus Torvalds .d_delete = nfs_dentry_delete, 19271da177e4SLinus Torvalds .d_iput = nfs_dentry_iput, 192836d43a43SDavid Howells .d_automount = nfs_d_automount, 1929b1942c5fSAl Viro .d_release = nfs_d_release, 19301da177e4SLinus Torvalds }; 193189d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs4_dentry_operations); 19321da177e4SLinus Torvalds 19338a5e929dSAl Viro static fmode_t flags_to_mode(int flags) 19348a5e929dSAl Viro { 19358a5e929dSAl Viro fmode_t res = (__force fmode_t)flags & FMODE_EXEC; 19368a5e929dSAl Viro if ((flags & O_ACCMODE) != O_WRONLY) 19378a5e929dSAl Viro res |= FMODE_READ; 19388a5e929dSAl Viro if ((flags & O_ACCMODE) != O_RDONLY) 19398a5e929dSAl Viro res |= FMODE_WRITE; 19408a5e929dSAl Viro return res; 19418a5e929dSAl Viro } 19428a5e929dSAl Viro 1943532d4defSNeilBrown static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags, struct file *filp) 1944cd9a1c0eSTrond Myklebust { 1945532d4defSNeilBrown return alloc_nfs_open_context(dentry, flags_to_mode(open_flags), filp); 1946cd9a1c0eSTrond Myklebust } 1947cd9a1c0eSTrond Myklebust 1948cd9a1c0eSTrond Myklebust static int do_open(struct inode *inode, struct file *filp) 1949cd9a1c0eSTrond Myklebust { 1950f1fe29b4SDavid Howells nfs_fscache_open_file(inode, filp); 1951cd9a1c0eSTrond Myklebust return 0; 1952cd9a1c0eSTrond Myklebust } 1953cd9a1c0eSTrond Myklebust 1954d9585277SAl Viro static int nfs_finish_open(struct nfs_open_context *ctx, 19550dd2b474SMiklos Szeredi struct dentry *dentry, 1956b452a458SAl Viro struct file *file, unsigned open_flags) 1957cd9a1c0eSTrond Myklebust { 19580dd2b474SMiklos Szeredi int err; 19590dd2b474SMiklos Szeredi 1960be12af3eSAl Viro err = finish_open(file, dentry, do_open); 196130d90494SAl Viro if (err) 1962d9585277SAl Viro goto out; 1963eaa2b82cSNeilBrown if (S_ISREG(file->f_path.dentry->d_inode->i_mode)) 196430d90494SAl Viro nfs_file_set_open_context(file, ctx); 1965eaa2b82cSNeilBrown else 19669821421aSTrond Myklebust err = -EOPENSTALE; 1967cd9a1c0eSTrond Myklebust out: 1968d9585277SAl Viro return err; 1969cd9a1c0eSTrond Myklebust } 1970cd9a1c0eSTrond Myklebust 197173a79706SBryan Schumaker int nfs_atomic_open(struct inode *dir, struct dentry *dentry, 197230d90494SAl Viro struct file *file, unsigned open_flags, 197344907d79SAl Viro umode_t mode) 19741da177e4SLinus Torvalds { 1975c94c0953SAl Viro DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); 1976cd9a1c0eSTrond Myklebust struct nfs_open_context *ctx; 19770dd2b474SMiklos Szeredi struct dentry *res; 19780dd2b474SMiklos Szeredi struct iattr attr = { .ia_valid = ATTR_OPEN }; 1979f46e0bd3STrond Myklebust struct inode *inode; 19801472b83eSTrond Myklebust unsigned int lookup_flags = 0; 198168eaba4cSTrond Myklebust unsigned long dir_verifier; 1982c94c0953SAl Viro bool switched = false; 198373a09dd9SAl Viro int created = 0; 1984898f635cSTrond Myklebust int err; 19851da177e4SLinus Torvalds 19860dd2b474SMiklos Szeredi /* Expect a negative dentry */ 19872b0143b5SDavid Howells BUG_ON(d_inode(dentry)); 19880dd2b474SMiklos Szeredi 19891e8968c5SNiels de Vos dfprintk(VFS, "NFS: atomic_open(%s/%lu), %pd\n", 19906de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 19911e7cb3dcSChuck Lever 19929597c13bSJeff Layton err = nfs_check_flags(open_flags); 19939597c13bSJeff Layton if (err) 19949597c13bSJeff Layton return err; 19959597c13bSJeff Layton 19960dd2b474SMiklos Szeredi /* NFS only supports OPEN on regular files */ 19970dd2b474SMiklos Szeredi if ((open_flags & O_DIRECTORY)) { 199800699ad8SAl Viro if (!d_in_lookup(dentry)) { 19990dd2b474SMiklos Szeredi /* 20000dd2b474SMiklos Szeredi * Hashed negative dentry with O_DIRECTORY: dentry was 20010dd2b474SMiklos Szeredi * revalidated and is fine, no need to perform lookup 20020dd2b474SMiklos Szeredi * again 20030dd2b474SMiklos Szeredi */ 2004d9585277SAl Viro return -ENOENT; 20050dd2b474SMiklos Szeredi } 20061472b83eSTrond Myklebust lookup_flags = LOOKUP_OPEN|LOOKUP_DIRECTORY; 20071da177e4SLinus Torvalds goto no_open; 20081da177e4SLinus Torvalds } 20091da177e4SLinus Torvalds 20100dd2b474SMiklos Szeredi if (dentry->d_name.len > NFS_SERVER(dir)->namelen) 2011d9585277SAl Viro return -ENAMETOOLONG; 20121da177e4SLinus Torvalds 20130dd2b474SMiklos Szeredi if (open_flags & O_CREAT) { 2014dff25ddbSAndreas Gruenbacher struct nfs_server *server = NFS_SERVER(dir); 2015dff25ddbSAndreas Gruenbacher 2016dff25ddbSAndreas Gruenbacher if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 2017dff25ddbSAndreas Gruenbacher mode &= ~current_umask(); 2018dff25ddbSAndreas Gruenbacher 2019536e43d1STrond Myklebust attr.ia_valid |= ATTR_MODE; 2020dff25ddbSAndreas Gruenbacher attr.ia_mode = mode; 20210dd2b474SMiklos Szeredi } 2022536e43d1STrond Myklebust if (open_flags & O_TRUNC) { 2023536e43d1STrond Myklebust attr.ia_valid |= ATTR_SIZE; 2024536e43d1STrond Myklebust attr.ia_size = 0; 2025cd9a1c0eSTrond Myklebust } 2026cd9a1c0eSTrond Myklebust 2027c94c0953SAl Viro if (!(open_flags & O_CREAT) && !d_in_lookup(dentry)) { 2028c94c0953SAl Viro d_drop(dentry); 2029c94c0953SAl Viro switched = true; 2030c94c0953SAl Viro dentry = d_alloc_parallel(dentry->d_parent, 2031c94c0953SAl Viro &dentry->d_name, &wq); 2032c94c0953SAl Viro if (IS_ERR(dentry)) 2033c94c0953SAl Viro return PTR_ERR(dentry); 2034c94c0953SAl Viro if (unlikely(!d_in_lookup(dentry))) 2035c94c0953SAl Viro return finish_no_open(file, dentry); 2036c94c0953SAl Viro } 2037c94c0953SAl Viro 2038532d4defSNeilBrown ctx = create_nfs_open_context(dentry, open_flags, file); 20390dd2b474SMiklos Szeredi err = PTR_ERR(ctx); 20400dd2b474SMiklos Szeredi if (IS_ERR(ctx)) 2041d9585277SAl Viro goto out; 20420dd2b474SMiklos Szeredi 20436e0d0be7STrond Myklebust trace_nfs_atomic_open_enter(dir, ctx, open_flags); 204473a09dd9SAl Viro inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, &created); 204573a09dd9SAl Viro if (created) 204673a09dd9SAl Viro file->f_mode |= FMODE_CREATED; 2047275bb307STrond Myklebust if (IS_ERR(inode)) { 20480dd2b474SMiklos Szeredi err = PTR_ERR(inode); 20496e0d0be7STrond Myklebust trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); 20502d9db750STrond Myklebust put_nfs_open_context(ctx); 2051d20cb71dSAl Viro d_drop(dentry); 20520dd2b474SMiklos Szeredi switch (err) { 20531da177e4SLinus Torvalds case -ENOENT: 2054774d9513SPeng Tao d_splice_alias(NULL, dentry); 205568eaba4cSTrond Myklebust if (nfs_server_capable(dir, NFS_CAP_CASE_INSENSITIVE)) 205668eaba4cSTrond Myklebust dir_verifier = inode_peek_iversion_raw(dir); 205768eaba4cSTrond Myklebust else 205868eaba4cSTrond Myklebust dir_verifier = nfs_save_change_attribute(dir); 205968eaba4cSTrond Myklebust nfs_set_verifier(dentry, dir_verifier); 20600dd2b474SMiklos Szeredi break; 20611788ea6eSJeff Layton case -EISDIR: 20626f926b5bSTrond Myklebust case -ENOTDIR: 20636f926b5bSTrond Myklebust goto no_open; 20641da177e4SLinus Torvalds case -ELOOP: 20650dd2b474SMiklos Szeredi if (!(open_flags & O_NOFOLLOW)) 20661da177e4SLinus Torvalds goto no_open; 20670dd2b474SMiklos Szeredi break; 20681da177e4SLinus Torvalds /* case -EINVAL: */ 20691da177e4SLinus Torvalds default: 20700dd2b474SMiklos Szeredi break; 20711da177e4SLinus Torvalds } 20721da177e4SLinus Torvalds goto out; 20731da177e4SLinus Torvalds } 20740dd2b474SMiklos Szeredi 2075b452a458SAl Viro err = nfs_finish_open(ctx, ctx->dentry, file, open_flags); 20766e0d0be7STrond Myklebust trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); 20772d9db750STrond Myklebust put_nfs_open_context(ctx); 2078d9585277SAl Viro out: 2079c94c0953SAl Viro if (unlikely(switched)) { 2080c94c0953SAl Viro d_lookup_done(dentry); 2081c94c0953SAl Viro dput(dentry); 2082c94c0953SAl Viro } 2083d9585277SAl Viro return err; 20840dd2b474SMiklos Szeredi 20851da177e4SLinus Torvalds no_open: 20861472b83eSTrond Myklebust res = nfs_lookup(dir, dentry, lookup_flags); 2087ac795161STrond Myklebust if (!res) { 2088ac795161STrond Myklebust inode = d_inode(dentry); 2089ac795161STrond Myklebust if ((lookup_flags & LOOKUP_DIRECTORY) && inode && 2090e0caaf75STrond Myklebust !(S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) 2091ac795161STrond Myklebust res = ERR_PTR(-ENOTDIR); 20921751fc1dSTrond Myklebust else if (inode && S_ISREG(inode->i_mode)) 20931751fc1dSTrond Myklebust res = ERR_PTR(-EOPENSTALE); 2094ac795161STrond Myklebust } else if (!IS_ERR(res)) { 2095ac795161STrond Myklebust inode = d_inode(res); 2096ac795161STrond Myklebust if ((lookup_flags & LOOKUP_DIRECTORY) && inode && 2097e0caaf75STrond Myklebust !(S_ISDIR(inode->i_mode) || S_ISLNK(inode->i_mode))) { 2098ac795161STrond Myklebust dput(res); 2099ac795161STrond Myklebust res = ERR_PTR(-ENOTDIR); 21001751fc1dSTrond Myklebust } else if (inode && S_ISREG(inode->i_mode)) { 21011751fc1dSTrond Myklebust dput(res); 21021751fc1dSTrond Myklebust res = ERR_PTR(-EOPENSTALE); 2103ac795161STrond Myklebust } 2104ac795161STrond Myklebust } 2105c94c0953SAl Viro if (switched) { 2106c94c0953SAl Viro d_lookup_done(dentry); 2107c94c0953SAl Viro if (!res) 2108c94c0953SAl Viro res = dentry; 2109c94c0953SAl Viro else 2110c94c0953SAl Viro dput(dentry); 2111c94c0953SAl Viro } 21120dd2b474SMiklos Szeredi if (IS_ERR(res)) 2113c94c0953SAl Viro return PTR_ERR(res); 2114e45198a6SAl Viro return finish_no_open(file, res); 21151da177e4SLinus Torvalds } 211689d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_atomic_open); 21171da177e4SLinus Torvalds 2118c7944ebbSTrond Myklebust static int 2119c7944ebbSTrond Myklebust nfs4_do_lookup_revalidate(struct inode *dir, struct dentry *dentry, 2120c7944ebbSTrond Myklebust unsigned int flags) 21211da177e4SLinus Torvalds { 2122657e94b6SNick Piggin struct inode *inode; 21231da177e4SLinus Torvalds 2124fa3c56bbSAl Viro if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) 2125c7944ebbSTrond Myklebust goto full_reval; 2126eda72afbSMiklos Szeredi if (d_mountpoint(dentry)) 2127c7944ebbSTrond Myklebust goto full_reval; 21282b484297STrond Myklebust 21292b0143b5SDavid Howells inode = d_inode(dentry); 21302b484297STrond Myklebust 21311da177e4SLinus Torvalds /* We can't create new files in nfs_open_revalidate(), so we 21321da177e4SLinus Torvalds * optimize away revalidation of negative dentries. 21331da177e4SLinus Torvalds */ 2134c7944ebbSTrond Myklebust if (inode == NULL) 2135c7944ebbSTrond Myklebust goto full_reval; 213649317a7fSNeilBrown 2137efeda80dSTrond Myklebust if (nfs_verifier_is_delegated(dentry)) 2138c7944ebbSTrond Myklebust return nfs_lookup_revalidate_delegated(dir, dentry, inode); 2139216d5d06STrond Myklebust 21401da177e4SLinus Torvalds /* NFS only supports OPEN on regular files */ 21411da177e4SLinus Torvalds if (!S_ISREG(inode->i_mode)) 2142c7944ebbSTrond Myklebust goto full_reval; 2143c7944ebbSTrond Myklebust 21441da177e4SLinus Torvalds /* We cannot do exclusive creation on a positive dentry */ 2145c7944ebbSTrond Myklebust if (flags & (LOOKUP_EXCL | LOOKUP_REVAL)) 2146c7944ebbSTrond Myklebust goto reval_dentry; 2147c7944ebbSTrond Myklebust 2148c7944ebbSTrond Myklebust /* Check if the directory changed */ 2149c7944ebbSTrond Myklebust if (!nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) 2150c7944ebbSTrond Myklebust goto reval_dentry; 21511da177e4SLinus Torvalds 21520ef97dcfSMiklos Szeredi /* Let f_op->open() actually open (and revalidate) the file */ 2153c7944ebbSTrond Myklebust return 1; 2154c7944ebbSTrond Myklebust reval_dentry: 2155c7944ebbSTrond Myklebust if (flags & LOOKUP_RCU) 2156c7944ebbSTrond Myklebust return -ECHILD; 215742f72cf3Szhangliguang return nfs_lookup_revalidate_dentry(dir, dentry, inode); 21580ef97dcfSMiklos Szeredi 2159c7944ebbSTrond Myklebust full_reval: 2160c7944ebbSTrond Myklebust return nfs_do_lookup_revalidate(dir, dentry, flags); 2161c7944ebbSTrond Myklebust } 2162535918f1STrond Myklebust 2163c7944ebbSTrond Myklebust static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) 2164c7944ebbSTrond Myklebust { 2165c7944ebbSTrond Myklebust return __nfs_lookup_revalidate(dentry, flags, 2166c7944ebbSTrond Myklebust nfs4_do_lookup_revalidate); 2167c0204fd2STrond Myklebust } 2168c0204fd2STrond Myklebust 21691da177e4SLinus Torvalds #endif /* CONFIG_NFSV4 */ 21701da177e4SLinus Torvalds 2171406cd915SBenjamin Coddington struct dentry * 2172406cd915SBenjamin Coddington nfs_add_or_obtain(struct dentry *dentry, struct nfs_fh *fhandle, 2173cc6f3298SAnna Schumaker struct nfs_fattr *fattr) 21741da177e4SLinus Torvalds { 2175fab728e1STrond Myklebust struct dentry *parent = dget_parent(dentry); 21762b0143b5SDavid Howells struct inode *dir = d_inode(parent); 21771da177e4SLinus Torvalds struct inode *inode; 2178b0c6108eSAl Viro struct dentry *d; 2179406cd915SBenjamin Coddington int error; 21801da177e4SLinus Torvalds 2181fab728e1STrond Myklebust d_drop(dentry); 2182fab728e1STrond Myklebust 21831da177e4SLinus Torvalds if (fhandle->size == 0) { 21849558a007SAnna Schumaker error = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr); 21851da177e4SLinus Torvalds if (error) 2186fab728e1STrond Myklebust goto out_error; 21871da177e4SLinus Torvalds } 21885724ab37STrond Myklebust nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 21891da177e4SLinus Torvalds if (!(fattr->valid & NFS_ATTR_FATTR)) { 21901da177e4SLinus Torvalds struct nfs_server *server = NFS_SB(dentry->d_sb); 2191a841b54dSTrond Myklebust error = server->nfs_client->rpc_ops->getattr(server, fhandle, 21922ef61e0eSAnna Schumaker fattr, NULL); 21931da177e4SLinus Torvalds if (error < 0) 2194fab728e1STrond Myklebust goto out_error; 21951da177e4SLinus Torvalds } 2196cf7ab00aSAnna Schumaker inode = nfs_fhget(dentry->d_sb, fhandle, fattr); 2197b0c6108eSAl Viro d = d_splice_alias(inode, dentry); 2198fab728e1STrond Myklebust out: 2199fab728e1STrond Myklebust dput(parent); 2200406cd915SBenjamin Coddington return d; 2201fab728e1STrond Myklebust out_error: 2202406cd915SBenjamin Coddington d = ERR_PTR(error); 2203406cd915SBenjamin Coddington goto out; 2204406cd915SBenjamin Coddington } 2205406cd915SBenjamin Coddington EXPORT_SYMBOL_GPL(nfs_add_or_obtain); 2206406cd915SBenjamin Coddington 2207406cd915SBenjamin Coddington /* 2208406cd915SBenjamin Coddington * Code common to create, mkdir, and mknod. 2209406cd915SBenjamin Coddington */ 2210406cd915SBenjamin Coddington int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, 2211d91bfc46SAnna Schumaker struct nfs_fattr *fattr) 2212406cd915SBenjamin Coddington { 2213406cd915SBenjamin Coddington struct dentry *d; 2214406cd915SBenjamin Coddington 2215cc6f3298SAnna Schumaker d = nfs_add_or_obtain(dentry, fhandle, fattr); 2216406cd915SBenjamin Coddington if (IS_ERR(d)) 2217406cd915SBenjamin Coddington return PTR_ERR(d); 2218406cd915SBenjamin Coddington 2219406cd915SBenjamin Coddington /* Callers don't care */ 2220406cd915SBenjamin Coddington dput(d); 2221406cd915SBenjamin Coddington return 0; 22221da177e4SLinus Torvalds } 2223ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_instantiate); 22241da177e4SLinus Torvalds 22251da177e4SLinus Torvalds /* 22261da177e4SLinus Torvalds * Following a failed create operation, we drop the dentry rather 22271da177e4SLinus Torvalds * than retain a negative dentry. This avoids a problem in the event 22281da177e4SLinus Torvalds * that the operation succeeded on the server, but an error in the 22291da177e4SLinus Torvalds * reply path made it appear to have failed. 22301da177e4SLinus Torvalds */ 2231549c7297SChristian Brauner int nfs_create(struct user_namespace *mnt_userns, struct inode *dir, 2232549c7297SChristian Brauner struct dentry *dentry, umode_t mode, bool excl) 22331da177e4SLinus Torvalds { 22341da177e4SLinus Torvalds struct iattr attr; 2235ebfc3b49SAl Viro int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; 22361da177e4SLinus Torvalds int error; 22371da177e4SLinus Torvalds 22381e8968c5SNiels de Vos dfprintk(VFS, "NFS: create(%s/%lu), %pd\n", 22396de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 22401da177e4SLinus Torvalds 22411da177e4SLinus Torvalds attr.ia_mode = mode; 22421da177e4SLinus Torvalds attr.ia_valid = ATTR_MODE; 22431da177e4SLinus Torvalds 22448b0ad3d4STrond Myklebust trace_nfs_create_enter(dir, dentry, open_flags); 22458867fe58SMiklos Szeredi error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); 22468b0ad3d4STrond Myklebust trace_nfs_create_exit(dir, dentry, open_flags, error); 22471da177e4SLinus Torvalds if (error != 0) 22481da177e4SLinus Torvalds goto out_err; 22491da177e4SLinus Torvalds return 0; 22501da177e4SLinus Torvalds out_err: 22511da177e4SLinus Torvalds d_drop(dentry); 22521da177e4SLinus Torvalds return error; 22531da177e4SLinus Torvalds } 2254ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_create); 22551da177e4SLinus Torvalds 22561da177e4SLinus Torvalds /* 22571da177e4SLinus Torvalds * See comments for nfs_proc_create regarding failed operations. 22581da177e4SLinus Torvalds */ 2259597d9289SBryan Schumaker int 2260549c7297SChristian Brauner nfs_mknod(struct user_namespace *mnt_userns, struct inode *dir, 2261549c7297SChristian Brauner struct dentry *dentry, umode_t mode, dev_t rdev) 22621da177e4SLinus Torvalds { 22631da177e4SLinus Torvalds struct iattr attr; 22641da177e4SLinus Torvalds int status; 22651da177e4SLinus Torvalds 22661e8968c5SNiels de Vos dfprintk(VFS, "NFS: mknod(%s/%lu), %pd\n", 22676de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 22681da177e4SLinus Torvalds 22691da177e4SLinus Torvalds attr.ia_mode = mode; 22701da177e4SLinus Torvalds attr.ia_valid = ATTR_MODE; 22711da177e4SLinus Torvalds 22721ca42382STrond Myklebust trace_nfs_mknod_enter(dir, dentry); 22731da177e4SLinus Torvalds status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); 22741ca42382STrond Myklebust trace_nfs_mknod_exit(dir, dentry, status); 22751da177e4SLinus Torvalds if (status != 0) 22761da177e4SLinus Torvalds goto out_err; 22771da177e4SLinus Torvalds return 0; 22781da177e4SLinus Torvalds out_err: 22791da177e4SLinus Torvalds d_drop(dentry); 22801da177e4SLinus Torvalds return status; 22811da177e4SLinus Torvalds } 2282ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_mknod); 22831da177e4SLinus Torvalds 22841da177e4SLinus Torvalds /* 22851da177e4SLinus Torvalds * See comments for nfs_proc_create regarding failed operations. 22861da177e4SLinus Torvalds */ 2287549c7297SChristian Brauner int nfs_mkdir(struct user_namespace *mnt_userns, struct inode *dir, 2288549c7297SChristian Brauner struct dentry *dentry, umode_t mode) 22891da177e4SLinus Torvalds { 22901da177e4SLinus Torvalds struct iattr attr; 22911da177e4SLinus Torvalds int error; 22921da177e4SLinus Torvalds 22931e8968c5SNiels de Vos dfprintk(VFS, "NFS: mkdir(%s/%lu), %pd\n", 22946de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 22951da177e4SLinus Torvalds 22961da177e4SLinus Torvalds attr.ia_valid = ATTR_MODE; 22971da177e4SLinus Torvalds attr.ia_mode = mode | S_IFDIR; 22981da177e4SLinus Torvalds 22991ca42382STrond Myklebust trace_nfs_mkdir_enter(dir, dentry); 23001da177e4SLinus Torvalds error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); 23011ca42382STrond Myklebust trace_nfs_mkdir_exit(dir, dentry, error); 23021da177e4SLinus Torvalds if (error != 0) 23031da177e4SLinus Torvalds goto out_err; 23041da177e4SLinus Torvalds return 0; 23051da177e4SLinus Torvalds out_err: 23061da177e4SLinus Torvalds d_drop(dentry); 23071da177e4SLinus Torvalds return error; 23081da177e4SLinus Torvalds } 2309ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_mkdir); 23101da177e4SLinus Torvalds 2311d45b9d8bSTrond Myklebust static void nfs_dentry_handle_enoent(struct dentry *dentry) 2312d45b9d8bSTrond Myklebust { 2313dc3f4198SAl Viro if (simple_positive(dentry)) 2314d45b9d8bSTrond Myklebust d_delete(dentry); 2315d45b9d8bSTrond Myklebust } 2316d45b9d8bSTrond Myklebust 23179019fb39STrond Myklebust static void nfs_dentry_remove_handle_error(struct inode *dir, 23189019fb39STrond Myklebust struct dentry *dentry, int error) 23199019fb39STrond Myklebust { 23209019fb39STrond Myklebust switch (error) { 23219019fb39STrond Myklebust case -ENOENT: 23229019fb39STrond Myklebust d_delete(dentry); 232300bdadc7STrond Myklebust nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 232400bdadc7STrond Myklebust break; 23259019fb39STrond Myklebust case 0: 232600bdadc7STrond Myklebust nfs_d_prune_case_insensitive_aliases(d_inode(dentry)); 23279019fb39STrond Myklebust nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 23289019fb39STrond Myklebust } 23299019fb39STrond Myklebust } 23309019fb39STrond Myklebust 2331597d9289SBryan Schumaker int nfs_rmdir(struct inode *dir, struct dentry *dentry) 23321da177e4SLinus Torvalds { 23331da177e4SLinus Torvalds int error; 23341da177e4SLinus Torvalds 23351e8968c5SNiels de Vos dfprintk(VFS, "NFS: rmdir(%s/%lu), %pd\n", 23366de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 23371da177e4SLinus Torvalds 23381ca42382STrond Myklebust trace_nfs_rmdir_enter(dir, dentry); 23392b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 2340884be175SAl Viro down_write(&NFS_I(d_inode(dentry))->rmdir_sem); 23411da177e4SLinus Torvalds error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); 23421da177e4SLinus Torvalds /* Ensure the VFS deletes this inode */ 2343ba6c0592STrond Myklebust switch (error) { 2344ba6c0592STrond Myklebust case 0: 23452b0143b5SDavid Howells clear_nlink(d_inode(dentry)); 2346ba6c0592STrond Myklebust break; 2347ba6c0592STrond Myklebust case -ENOENT: 2348d45b9d8bSTrond Myklebust nfs_dentry_handle_enoent(dentry); 2349ba6c0592STrond Myklebust } 2350884be175SAl Viro up_write(&NFS_I(d_inode(dentry))->rmdir_sem); 2351ba6c0592STrond Myklebust } else 2352ba6c0592STrond Myklebust error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); 23539019fb39STrond Myklebust nfs_dentry_remove_handle_error(dir, dentry, error); 23541ca42382STrond Myklebust trace_nfs_rmdir_exit(dir, dentry, error); 23551da177e4SLinus Torvalds 23561da177e4SLinus Torvalds return error; 23571da177e4SLinus Torvalds } 2358ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_rmdir); 23591da177e4SLinus Torvalds 23601da177e4SLinus Torvalds /* 23611da177e4SLinus Torvalds * Remove a file after making sure there are no pending writes, 23621da177e4SLinus Torvalds * and after checking that the file has only one user. 23631da177e4SLinus Torvalds * 23641da177e4SLinus Torvalds * We invalidate the attribute cache and free the inode prior to the operation 23651da177e4SLinus Torvalds * to avoid possible races if the server reuses the inode. 23661da177e4SLinus Torvalds */ 23671da177e4SLinus Torvalds static int nfs_safe_remove(struct dentry *dentry) 23681da177e4SLinus Torvalds { 23692b0143b5SDavid Howells struct inode *dir = d_inode(dentry->d_parent); 23702b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 23711da177e4SLinus Torvalds int error = -EBUSY; 23721da177e4SLinus Torvalds 23736de1472fSAl Viro dfprintk(VFS, "NFS: safe_remove(%pd2)\n", dentry); 23741da177e4SLinus Torvalds 23751da177e4SLinus Torvalds /* If the dentry was sillyrenamed, we simply call d_delete() */ 23761da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { 23771da177e4SLinus Torvalds error = 0; 23781da177e4SLinus Torvalds goto out; 23791da177e4SLinus Torvalds } 23801da177e4SLinus Torvalds 23811ca42382STrond Myklebust trace_nfs_remove_enter(dir, dentry); 23821da177e4SLinus Torvalds if (inode != NULL) { 2383912678dbSTrond Myklebust error = NFS_PROTO(dir)->remove(dir, dentry); 23841da177e4SLinus Torvalds if (error == 0) 23851b83d707STrond Myklebust nfs_drop_nlink(inode); 23861da177e4SLinus Torvalds } else 2387912678dbSTrond Myklebust error = NFS_PROTO(dir)->remove(dir, dentry); 2388d45b9d8bSTrond Myklebust if (error == -ENOENT) 2389d45b9d8bSTrond Myklebust nfs_dentry_handle_enoent(dentry); 23901ca42382STrond Myklebust trace_nfs_remove_exit(dir, dentry, error); 23911da177e4SLinus Torvalds out: 23921da177e4SLinus Torvalds return error; 23931da177e4SLinus Torvalds } 23941da177e4SLinus Torvalds 23951da177e4SLinus Torvalds /* We do silly rename. In case sillyrename() returns -EBUSY, the inode 23961da177e4SLinus Torvalds * belongs to an active ".nfs..." file and we return -EBUSY. 23971da177e4SLinus Torvalds * 23981da177e4SLinus Torvalds * If sillyrename() returns 0, we do nothing, otherwise we unlink. 23991da177e4SLinus Torvalds */ 2400597d9289SBryan Schumaker int nfs_unlink(struct inode *dir, struct dentry *dentry) 24011da177e4SLinus Torvalds { 24021da177e4SLinus Torvalds int error; 24031da177e4SLinus Torvalds int need_rehash = 0; 24041da177e4SLinus Torvalds 24051e8968c5SNiels de Vos dfprintk(VFS, "NFS: unlink(%s/%lu, %pd)\n", dir->i_sb->s_id, 24066de1472fSAl Viro dir->i_ino, dentry); 24071da177e4SLinus Torvalds 24081ca42382STrond Myklebust trace_nfs_unlink_enter(dir, dentry); 24091da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 241043245ecaSOlga Kornievskaia if (d_count(dentry) > 1 && !test_bit(NFS_INO_PRESERVE_UNLINKED, 241143245ecaSOlga Kornievskaia &NFS_I(d_inode(dentry))->flags)) { 24121da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 2413ccfeb506STrond Myklebust /* Start asynchronous writeout of the inode */ 24142b0143b5SDavid Howells write_inode_now(d_inode(dentry), 0); 24151da177e4SLinus Torvalds error = nfs_sillyrename(dir, dentry); 24161ca42382STrond Myklebust goto out; 24171da177e4SLinus Torvalds } 24181da177e4SLinus Torvalds if (!d_unhashed(dentry)) { 24191da177e4SLinus Torvalds __d_drop(dentry); 24201da177e4SLinus Torvalds need_rehash = 1; 24211da177e4SLinus Torvalds } 24221da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 24231da177e4SLinus Torvalds error = nfs_safe_remove(dentry); 24249019fb39STrond Myklebust nfs_dentry_remove_handle_error(dir, dentry, error); 24259019fb39STrond Myklebust if (need_rehash) 24261da177e4SLinus Torvalds d_rehash(dentry); 24271ca42382STrond Myklebust out: 24281ca42382STrond Myklebust trace_nfs_unlink_exit(dir, dentry, error); 24291da177e4SLinus Torvalds return error; 24301da177e4SLinus Torvalds } 2431ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_unlink); 24321da177e4SLinus Torvalds 2433873101b3SChuck Lever /* 2434873101b3SChuck Lever * To create a symbolic link, most file systems instantiate a new inode, 2435873101b3SChuck Lever * add a page to it containing the path, then write it out to the disk 2436873101b3SChuck Lever * using prepare_write/commit_write. 2437873101b3SChuck Lever * 2438873101b3SChuck Lever * Unfortunately the NFS client can't create the in-core inode first 2439873101b3SChuck Lever * because it needs a file handle to create an in-core inode (see 2440873101b3SChuck Lever * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the 2441873101b3SChuck Lever * symlink request has completed on the server. 2442873101b3SChuck Lever * 2443873101b3SChuck Lever * So instead we allocate a raw page, copy the symname into it, then do 2444873101b3SChuck Lever * the SYMLINK request with the page as the buffer. If it succeeds, we 2445873101b3SChuck Lever * now have a new file handle and can instantiate an in-core NFS inode 2446873101b3SChuck Lever * and move the raw page into its mapping. 2447873101b3SChuck Lever */ 2448549c7297SChristian Brauner int nfs_symlink(struct user_namespace *mnt_userns, struct inode *dir, 2449549c7297SChristian Brauner struct dentry *dentry, const char *symname) 24501da177e4SLinus Torvalds { 2451873101b3SChuck Lever struct page *page; 2452873101b3SChuck Lever char *kaddr; 24531da177e4SLinus Torvalds struct iattr attr; 2454873101b3SChuck Lever unsigned int pathlen = strlen(symname); 24551da177e4SLinus Torvalds int error; 24561da177e4SLinus Torvalds 24571e8968c5SNiels de Vos dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s)\n", dir->i_sb->s_id, 24586de1472fSAl Viro dir->i_ino, dentry, symname); 24591da177e4SLinus Torvalds 2460873101b3SChuck Lever if (pathlen > PAGE_SIZE) 2461873101b3SChuck Lever return -ENAMETOOLONG; 24621da177e4SLinus Torvalds 2463873101b3SChuck Lever attr.ia_mode = S_IFLNK | S_IRWXUGO; 2464873101b3SChuck Lever attr.ia_valid = ATTR_MODE; 24651da177e4SLinus Torvalds 2466e8ecde25SAl Viro page = alloc_page(GFP_USER); 246776566991STrond Myklebust if (!page) 2468873101b3SChuck Lever return -ENOMEM; 2469873101b3SChuck Lever 2470e8ecde25SAl Viro kaddr = page_address(page); 2471873101b3SChuck Lever memcpy(kaddr, symname, pathlen); 2472873101b3SChuck Lever if (pathlen < PAGE_SIZE) 2473873101b3SChuck Lever memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); 2474873101b3SChuck Lever 24751ca42382STrond Myklebust trace_nfs_symlink_enter(dir, dentry); 247694a6d753SChuck Lever error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); 24771ca42382STrond Myklebust trace_nfs_symlink_exit(dir, dentry, error); 2478873101b3SChuck Lever if (error != 0) { 24791e8968c5SNiels de Vos dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s) error %d\n", 2480873101b3SChuck Lever dir->i_sb->s_id, dir->i_ino, 24816de1472fSAl Viro dentry, symname, error); 24821da177e4SLinus Torvalds d_drop(dentry); 2483873101b3SChuck Lever __free_page(page); 24841da177e4SLinus Torvalds return error; 24851da177e4SLinus Torvalds } 24861da177e4SLinus Torvalds 2487342a67f0STrond Myklebust nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 2488342a67f0STrond Myklebust 2489873101b3SChuck Lever /* 2490873101b3SChuck Lever * No big deal if we can't add this page to the page cache here. 2491873101b3SChuck Lever * READLINK will get the missing page from the server if needed. 2492873101b3SChuck Lever */ 24932b0143b5SDavid Howells if (!add_to_page_cache_lru(page, d_inode(dentry)->i_mapping, 0, 2494873101b3SChuck Lever GFP_KERNEL)) { 2495873101b3SChuck Lever SetPageUptodate(page); 2496873101b3SChuck Lever unlock_page(page); 2497a0b54addSRafael Aquini /* 2498a0b54addSRafael Aquini * add_to_page_cache_lru() grabs an extra page refcount. 2499a0b54addSRafael Aquini * Drop it here to avoid leaking this page later. 2500a0b54addSRafael Aquini */ 250109cbfeafSKirill A. Shutemov put_page(page); 2502873101b3SChuck Lever } else 2503873101b3SChuck Lever __free_page(page); 2504873101b3SChuck Lever 2505873101b3SChuck Lever return 0; 2506873101b3SChuck Lever } 2507ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_symlink); 2508873101b3SChuck Lever 2509597d9289SBryan Schumaker int 25101da177e4SLinus Torvalds nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) 25111da177e4SLinus Torvalds { 25122b0143b5SDavid Howells struct inode *inode = d_inode(old_dentry); 25131da177e4SLinus Torvalds int error; 25141da177e4SLinus Torvalds 25156de1472fSAl Viro dfprintk(VFS, "NFS: link(%pd2 -> %pd2)\n", 25166de1472fSAl Viro old_dentry, dentry); 25171da177e4SLinus Torvalds 25181fd1085bSTrond Myklebust trace_nfs_link_enter(inode, dir, dentry); 25199697d234STrond Myklebust d_drop(dentry); 252020497503STrond Myklebust if (S_ISREG(inode->i_mode)) 252120497503STrond Myklebust nfs_sync_inode(inode); 25221da177e4SLinus Torvalds error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); 2523cf809556STrond Myklebust if (error == 0) { 2524342a67f0STrond Myklebust nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 25257de9c6eeSAl Viro ihold(inode); 25269697d234STrond Myklebust d_add(dentry, inode); 2527cf809556STrond Myklebust } 25281fd1085bSTrond Myklebust trace_nfs_link_exit(inode, dir, dentry, error); 25291da177e4SLinus Torvalds return error; 25301da177e4SLinus Torvalds } 2531ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_link); 25321da177e4SLinus Torvalds 25331da177e4SLinus Torvalds /* 25341da177e4SLinus Torvalds * RENAME 25351da177e4SLinus Torvalds * FIXME: Some nfsds, like the Linux user space nfsd, may generate a 25361da177e4SLinus Torvalds * different file handle for the same inode after a rename (e.g. when 25371da177e4SLinus Torvalds * moving to a different directory). A fail-safe method to do so would 25381da177e4SLinus Torvalds * be to look up old_dir/old_name, create a link to new_dir/new_name and 25391da177e4SLinus Torvalds * rename the old file using the sillyrename stuff. This way, the original 25401da177e4SLinus Torvalds * file in old_dir will go away when the last process iput()s the inode. 25411da177e4SLinus Torvalds * 25421da177e4SLinus Torvalds * FIXED. 25431da177e4SLinus Torvalds * 25441da177e4SLinus Torvalds * It actually works quite well. One needs to have the possibility for 25451da177e4SLinus Torvalds * at least one ".nfs..." file in each directory the file ever gets 25461da177e4SLinus Torvalds * moved or linked to which happens automagically with the new 25471da177e4SLinus Torvalds * implementation that only depends on the dcache stuff instead of 25481da177e4SLinus Torvalds * using the inode layer 25491da177e4SLinus Torvalds * 25501da177e4SLinus Torvalds * Unfortunately, things are a little more complicated than indicated 25511da177e4SLinus Torvalds * above. For a cross-directory move, we want to make sure we can get 25521da177e4SLinus Torvalds * rid of the old inode after the operation. This means there must be 25531da177e4SLinus Torvalds * no pending writes (if it's a file), and the use count must be 1. 25541da177e4SLinus Torvalds * If these conditions are met, we can drop the dentries before doing 25551da177e4SLinus Torvalds * the rename. 25561da177e4SLinus Torvalds */ 2557549c7297SChristian Brauner int nfs_rename(struct user_namespace *mnt_userns, struct inode *old_dir, 2558549c7297SChristian Brauner struct dentry *old_dentry, struct inode *new_dir, 2559549c7297SChristian Brauner struct dentry *new_dentry, unsigned int flags) 25601da177e4SLinus Torvalds { 25612b0143b5SDavid Howells struct inode *old_inode = d_inode(old_dentry); 25622b0143b5SDavid Howells struct inode *new_inode = d_inode(new_dentry); 2563d9f29500SBenjamin Coddington struct dentry *dentry = NULL, *rehash = NULL; 256480a491fdSJeff Layton struct rpc_task *task; 25651da177e4SLinus Torvalds int error = -EBUSY; 25661da177e4SLinus Torvalds 25671cd66c93SMiklos Szeredi if (flags) 25681cd66c93SMiklos Szeredi return -EINVAL; 25691cd66c93SMiklos Szeredi 25706de1472fSAl Viro dfprintk(VFS, "NFS: rename(%pd2 -> %pd2, ct=%d)\n", 25716de1472fSAl Viro old_dentry, new_dentry, 257284d08fa8SAl Viro d_count(new_dentry)); 25731da177e4SLinus Torvalds 257470ded201STrond Myklebust trace_nfs_rename_enter(old_dir, old_dentry, new_dir, new_dentry); 25751da177e4SLinus Torvalds /* 257628f79a1aSMiklos Szeredi * For non-directories, check whether the target is busy and if so, 257728f79a1aSMiklos Szeredi * make a copy of the dentry and then do a silly-rename. If the 257828f79a1aSMiklos Szeredi * silly-rename succeeds, the copied dentry is hashed and becomes 257928f79a1aSMiklos Szeredi * the new target. 25801da177e4SLinus Torvalds */ 258127226104SMiklos Szeredi if (new_inode && !S_ISDIR(new_inode->i_mode)) { 258227226104SMiklos Szeredi /* 258327226104SMiklos Szeredi * To prevent any new references to the target during the 258427226104SMiklos Szeredi * rename, we unhash the dentry in advance. 258527226104SMiklos Szeredi */ 2586d9f29500SBenjamin Coddington if (!d_unhashed(new_dentry)) { 258727226104SMiklos Szeredi d_drop(new_dentry); 2588d9f29500SBenjamin Coddington rehash = new_dentry; 2589d9f29500SBenjamin Coddington } 259027226104SMiklos Szeredi 259184d08fa8SAl Viro if (d_count(new_dentry) > 2) { 25921da177e4SLinus Torvalds int err; 259327226104SMiklos Szeredi 25941da177e4SLinus Torvalds /* copy the target dentry's name */ 25951da177e4SLinus Torvalds dentry = d_alloc(new_dentry->d_parent, 25961da177e4SLinus Torvalds &new_dentry->d_name); 25971da177e4SLinus Torvalds if (!dentry) 25981da177e4SLinus Torvalds goto out; 25991da177e4SLinus Torvalds 26001da177e4SLinus Torvalds /* silly-rename the existing target ... */ 26011da177e4SLinus Torvalds err = nfs_sillyrename(new_dir, new_dentry); 260224e93025SMiklos Szeredi if (err) 26031da177e4SLinus Torvalds goto out; 260424e93025SMiklos Szeredi 260524e93025SMiklos Szeredi new_dentry = dentry; 2606d9f29500SBenjamin Coddington rehash = NULL; 260724e93025SMiklos Szeredi new_inode = NULL; 2608b1e4adf4STrond Myklebust } 260927226104SMiklos Szeredi } 26101da177e4SLinus Torvalds 26116ff9d99bSTrond Myklebust if (S_ISREG(old_inode->i_mode)) 26126ff9d99bSTrond Myklebust nfs_sync_inode(old_inode); 2613d9f29500SBenjamin Coddington task = nfs_async_rename(old_dir, new_dir, old_dentry, new_dentry, NULL); 261480a491fdSJeff Layton if (IS_ERR(task)) { 261580a491fdSJeff Layton error = PTR_ERR(task); 261680a491fdSJeff Layton goto out; 261780a491fdSJeff Layton } 261880a491fdSJeff Layton 261980a491fdSJeff Layton error = rpc_wait_for_completion_task(task); 2620818a8dbeSBenjamin Coddington if (error != 0) { 2621818a8dbeSBenjamin Coddington ((struct nfs_renamedata *)task->tk_calldata)->cancelled = 1; 2622818a8dbeSBenjamin Coddington /* Paired with the atomic_dec_and_test() barrier in rpc_do_put_task() */ 2623818a8dbeSBenjamin Coddington smp_wmb(); 2624818a8dbeSBenjamin Coddington } else 262580a491fdSJeff Layton error = task->tk_status; 262680a491fdSJeff Layton rpc_put_task(task); 262759a707b0STrond Myklebust /* Ensure the inode attributes are revalidated */ 262859a707b0STrond Myklebust if (error == 0) { 262959a707b0STrond Myklebust spin_lock(&old_inode->i_lock); 263059a707b0STrond Myklebust NFS_I(old_inode)->attr_gencount = nfs_inc_attr_generation_counter(); 2631ac46b3d7STrond Myklebust nfs_set_cache_invalid(old_inode, NFS_INO_INVALID_CHANGE | 2632ac46b3d7STrond Myklebust NFS_INO_INVALID_CTIME | 2633ac46b3d7STrond Myklebust NFS_INO_REVAL_FORCED); 263459a707b0STrond Myklebust spin_unlock(&old_inode->i_lock); 263559a707b0STrond Myklebust } 26361da177e4SLinus Torvalds out: 2637d9f29500SBenjamin Coddington if (rehash) 2638d9f29500SBenjamin Coddington d_rehash(rehash); 263970ded201STrond Myklebust trace_nfs_rename_exit(old_dir, old_dentry, 264070ded201STrond Myklebust new_dir, new_dentry, error); 2641d9f29500SBenjamin Coddington if (!error) { 2642d9f29500SBenjamin Coddington if (new_inode != NULL) 2643d9f29500SBenjamin Coddington nfs_drop_nlink(new_inode); 2644d9f29500SBenjamin Coddington /* 2645d9f29500SBenjamin Coddington * The d_move() should be here instead of in an async RPC completion 2646d9f29500SBenjamin Coddington * handler because we need the proper locks to move the dentry. If 2647d9f29500SBenjamin Coddington * we're interrupted by a signal, the async RPC completion handler 2648d9f29500SBenjamin Coddington * should mark the directories for revalidation. 2649d9f29500SBenjamin Coddington */ 2650d9f29500SBenjamin Coddington d_move(old_dentry, new_dentry); 2651d803224cSTrond Myklebust nfs_set_verifier(old_dentry, 2652d9f29500SBenjamin Coddington nfs_save_change_attribute(new_dir)); 2653d9f29500SBenjamin Coddington } else if (error == -ENOENT) 2654d9f29500SBenjamin Coddington nfs_dentry_handle_enoent(old_dentry); 2655d9f29500SBenjamin Coddington 26561da177e4SLinus Torvalds /* new dentry created? */ 26571da177e4SLinus Torvalds if (dentry) 26581da177e4SLinus Torvalds dput(dentry); 26591da177e4SLinus Torvalds return error; 26601da177e4SLinus Torvalds } 2661ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_rename); 26621da177e4SLinus Torvalds 2663cfcea3e8STrond Myklebust static DEFINE_SPINLOCK(nfs_access_lru_lock); 2664cfcea3e8STrond Myklebust static LIST_HEAD(nfs_access_lru_list); 2665cfcea3e8STrond Myklebust static atomic_long_t nfs_access_nr_entries; 2666cfcea3e8STrond Myklebust 2667a8b373eeSTrond Myklebust static unsigned long nfs_access_max_cachesize = 4*1024*1024; 26683a505845STrond Myklebust module_param(nfs_access_max_cachesize, ulong, 0644); 26693a505845STrond Myklebust MODULE_PARM_DESC(nfs_access_max_cachesize, "NFS access maximum total cache length"); 26703a505845STrond Myklebust 26711c3c07e9STrond Myklebust static void nfs_access_free_entry(struct nfs_access_entry *entry) 26721c3c07e9STrond Myklebust { 26736238aec8SNeilBrown put_group_info(entry->group_info); 2674f682a398SNeilBrown kfree_rcu(entry, rcu_head); 26754e857c58SPeter Zijlstra smp_mb__before_atomic(); 2676cfcea3e8STrond Myklebust atomic_long_dec(&nfs_access_nr_entries); 26774e857c58SPeter Zijlstra smp_mb__after_atomic(); 26781c3c07e9STrond Myklebust } 26791c3c07e9STrond Myklebust 26801a81bb8aSTrond Myklebust static void nfs_access_free_list(struct list_head *head) 26811a81bb8aSTrond Myklebust { 26821a81bb8aSTrond Myklebust struct nfs_access_entry *cache; 26831a81bb8aSTrond Myklebust 26841a81bb8aSTrond Myklebust while (!list_empty(head)) { 26851a81bb8aSTrond Myklebust cache = list_entry(head->next, struct nfs_access_entry, lru); 26861a81bb8aSTrond Myklebust list_del(&cache->lru); 26871a81bb8aSTrond Myklebust nfs_access_free_entry(cache); 26881a81bb8aSTrond Myklebust } 26891a81bb8aSTrond Myklebust } 26901a81bb8aSTrond Myklebust 26913a505845STrond Myklebust static unsigned long 26923a505845STrond Myklebust nfs_do_access_cache_scan(unsigned int nr_to_scan) 2693979df72eSTrond Myklebust { 2694979df72eSTrond Myklebust LIST_HEAD(head); 2695aa510da5STrond Myklebust struct nfs_inode *nfsi, *next; 2696979df72eSTrond Myklebust struct nfs_access_entry *cache; 26971ab6c499SDave Chinner long freed = 0; 2698979df72eSTrond Myklebust 2699a50f7951STrond Myklebust spin_lock(&nfs_access_lru_lock); 2700aa510da5STrond Myklebust list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { 2701979df72eSTrond Myklebust struct inode *inode; 2702979df72eSTrond Myklebust 2703979df72eSTrond Myklebust if (nr_to_scan-- == 0) 2704979df72eSTrond Myklebust break; 27059c7e7e23STrond Myklebust inode = &nfsi->vfs_inode; 2706979df72eSTrond Myklebust spin_lock(&inode->i_lock); 2707979df72eSTrond Myklebust if (list_empty(&nfsi->access_cache_entry_lru)) 2708979df72eSTrond Myklebust goto remove_lru_entry; 2709979df72eSTrond Myklebust cache = list_entry(nfsi->access_cache_entry_lru.next, 2710979df72eSTrond Myklebust struct nfs_access_entry, lru); 2711979df72eSTrond Myklebust list_move(&cache->lru, &head); 2712979df72eSTrond Myklebust rb_erase(&cache->rb_node, &nfsi->access_cache); 27131ab6c499SDave Chinner freed++; 2714979df72eSTrond Myklebust if (!list_empty(&nfsi->access_cache_entry_lru)) 2715979df72eSTrond Myklebust list_move_tail(&nfsi->access_cache_inode_lru, 2716979df72eSTrond Myklebust &nfs_access_lru_list); 2717979df72eSTrond Myklebust else { 2718979df72eSTrond Myklebust remove_lru_entry: 2719979df72eSTrond Myklebust list_del_init(&nfsi->access_cache_inode_lru); 27204e857c58SPeter Zijlstra smp_mb__before_atomic(); 2721979df72eSTrond Myklebust clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); 27224e857c58SPeter Zijlstra smp_mb__after_atomic(); 2723979df72eSTrond Myklebust } 272459844a9bSTrond Myklebust spin_unlock(&inode->i_lock); 2725979df72eSTrond Myklebust } 2726979df72eSTrond Myklebust spin_unlock(&nfs_access_lru_lock); 27271a81bb8aSTrond Myklebust nfs_access_free_list(&head); 27281ab6c499SDave Chinner return freed; 27291ab6c499SDave Chinner } 27301ab6c499SDave Chinner 27311ab6c499SDave Chinner unsigned long 27323a505845STrond Myklebust nfs_access_cache_scan(struct shrinker *shrink, struct shrink_control *sc) 27333a505845STrond Myklebust { 27343a505845STrond Myklebust int nr_to_scan = sc->nr_to_scan; 27353a505845STrond Myklebust gfp_t gfp_mask = sc->gfp_mask; 27363a505845STrond Myklebust 27373a505845STrond Myklebust if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) 27383a505845STrond Myklebust return SHRINK_STOP; 27393a505845STrond Myklebust return nfs_do_access_cache_scan(nr_to_scan); 27403a505845STrond Myklebust } 27413a505845STrond Myklebust 27423a505845STrond Myklebust 27433a505845STrond Myklebust unsigned long 27441ab6c499SDave Chinner nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc) 27451ab6c499SDave Chinner { 274655f841ceSGlauber Costa return vfs_pressure_ratio(atomic_long_read(&nfs_access_nr_entries)); 2747979df72eSTrond Myklebust } 2748979df72eSTrond Myklebust 27493a505845STrond Myklebust static void 27503a505845STrond Myklebust nfs_access_cache_enforce_limit(void) 27513a505845STrond Myklebust { 27523a505845STrond Myklebust long nr_entries = atomic_long_read(&nfs_access_nr_entries); 27533a505845STrond Myklebust unsigned long diff; 27543a505845STrond Myklebust unsigned int nr_to_scan; 27553a505845STrond Myklebust 27563a505845STrond Myklebust if (nr_entries < 0 || nr_entries <= nfs_access_max_cachesize) 27573a505845STrond Myklebust return; 27583a505845STrond Myklebust nr_to_scan = 100; 27593a505845STrond Myklebust diff = nr_entries - nfs_access_max_cachesize; 27603a505845STrond Myklebust if (diff < nr_to_scan) 27613a505845STrond Myklebust nr_to_scan = diff; 27623a505845STrond Myklebust nfs_do_access_cache_scan(nr_to_scan); 27633a505845STrond Myklebust } 27643a505845STrond Myklebust 27651a81bb8aSTrond Myklebust static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) 27661c3c07e9STrond Myklebust { 27671c3c07e9STrond Myklebust struct rb_root *root_node = &nfsi->access_cache; 27681a81bb8aSTrond Myklebust struct rb_node *n; 27691c3c07e9STrond Myklebust struct nfs_access_entry *entry; 27701c3c07e9STrond Myklebust 27711c3c07e9STrond Myklebust /* Unhook entries from the cache */ 27721c3c07e9STrond Myklebust while ((n = rb_first(root_node)) != NULL) { 27731c3c07e9STrond Myklebust entry = rb_entry(n, struct nfs_access_entry, rb_node); 27741c3c07e9STrond Myklebust rb_erase(n, root_node); 27751a81bb8aSTrond Myklebust list_move(&entry->lru, head); 27761c3c07e9STrond Myklebust } 27771c3c07e9STrond Myklebust nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; 27781c3c07e9STrond Myklebust } 27791c3c07e9STrond Myklebust 27801c3c07e9STrond Myklebust void nfs_access_zap_cache(struct inode *inode) 27811c3c07e9STrond Myklebust { 27821a81bb8aSTrond Myklebust LIST_HEAD(head); 27831a81bb8aSTrond Myklebust 27841a81bb8aSTrond Myklebust if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) 27851a81bb8aSTrond Myklebust return; 2786cfcea3e8STrond Myklebust /* Remove from global LRU init */ 2787cfcea3e8STrond Myklebust spin_lock(&nfs_access_lru_lock); 27881a81bb8aSTrond Myklebust if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) 2789cfcea3e8STrond Myklebust list_del_init(&NFS_I(inode)->access_cache_inode_lru); 2790cfcea3e8STrond Myklebust 27911c3c07e9STrond Myklebust spin_lock(&inode->i_lock); 27921a81bb8aSTrond Myklebust __nfs_access_zap_cache(NFS_I(inode), &head); 27931a81bb8aSTrond Myklebust spin_unlock(&inode->i_lock); 27941a81bb8aSTrond Myklebust spin_unlock(&nfs_access_lru_lock); 27951a81bb8aSTrond Myklebust nfs_access_free_list(&head); 27961c3c07e9STrond Myklebust } 27971c606fb7SBryan Schumaker EXPORT_SYMBOL_GPL(nfs_access_zap_cache); 27981c3c07e9STrond Myklebust 27996238aec8SNeilBrown static int access_cmp(const struct cred *a, const struct nfs_access_entry *b) 28006238aec8SNeilBrown { 28016238aec8SNeilBrown struct group_info *ga, *gb; 28026238aec8SNeilBrown int g; 28036238aec8SNeilBrown 28046238aec8SNeilBrown if (uid_lt(a->fsuid, b->fsuid)) 28056238aec8SNeilBrown return -1; 28066238aec8SNeilBrown if (uid_gt(a->fsuid, b->fsuid)) 28076238aec8SNeilBrown return 1; 28086238aec8SNeilBrown 28096238aec8SNeilBrown if (gid_lt(a->fsgid, b->fsgid)) 28106238aec8SNeilBrown return -1; 28116238aec8SNeilBrown if (gid_gt(a->fsgid, b->fsgid)) 28126238aec8SNeilBrown return 1; 28136238aec8SNeilBrown 28146238aec8SNeilBrown ga = a->group_info; 28156238aec8SNeilBrown gb = b->group_info; 28166238aec8SNeilBrown if (ga == gb) 28176238aec8SNeilBrown return 0; 28186238aec8SNeilBrown if (ga == NULL) 28196238aec8SNeilBrown return -1; 28206238aec8SNeilBrown if (gb == NULL) 28216238aec8SNeilBrown return 1; 28226238aec8SNeilBrown if (ga->ngroups < gb->ngroups) 28236238aec8SNeilBrown return -1; 28246238aec8SNeilBrown if (ga->ngroups > gb->ngroups) 28256238aec8SNeilBrown return 1; 28266238aec8SNeilBrown 28276238aec8SNeilBrown for (g = 0; g < ga->ngroups; g++) { 28286238aec8SNeilBrown if (gid_lt(ga->gid[g], gb->gid[g])) 28296238aec8SNeilBrown return -1; 28306238aec8SNeilBrown if (gid_gt(ga->gid[g], gb->gid[g])) 28316238aec8SNeilBrown return 1; 28326238aec8SNeilBrown } 28336238aec8SNeilBrown return 0; 28346238aec8SNeilBrown } 28356238aec8SNeilBrown 2836b68572e0SNeilBrown static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, const struct cred *cred) 28371c3c07e9STrond Myklebust { 28381c3c07e9STrond Myklebust struct rb_node *n = NFS_I(inode)->access_cache.rb_node; 28391c3c07e9STrond Myklebust 28401c3c07e9STrond Myklebust while (n != NULL) { 2841b68572e0SNeilBrown struct nfs_access_entry *entry = 2842b68572e0SNeilBrown rb_entry(n, struct nfs_access_entry, rb_node); 28436238aec8SNeilBrown int cmp = access_cmp(cred, entry); 28441c3c07e9STrond Myklebust 2845b68572e0SNeilBrown if (cmp < 0) 28461c3c07e9STrond Myklebust n = n->rb_left; 2847b68572e0SNeilBrown else if (cmp > 0) 28481c3c07e9STrond Myklebust n = n->rb_right; 28491c3c07e9STrond Myklebust else 28501c3c07e9STrond Myklebust return entry; 28511c3c07e9STrond Myklebust } 28521c3c07e9STrond Myklebust return NULL; 28531c3c07e9STrond Myklebust } 28541c3c07e9STrond Myklebust 2855b5e7b59cSNeilBrown static int nfs_access_get_cached_locked(struct inode *inode, const struct cred *cred, u32 *mask, bool may_block) 28561da177e4SLinus Torvalds { 285755296809SChuck Lever struct nfs_inode *nfsi = NFS_I(inode); 28581c3c07e9STrond Myklebust struct nfs_access_entry *cache; 285957b69181STrond Myklebust bool retry = true; 286057b69181STrond Myklebust int err; 28611da177e4SLinus Torvalds 28621c3c07e9STrond Myklebust spin_lock(&inode->i_lock); 286357b69181STrond Myklebust for(;;) { 28641c3c07e9STrond Myklebust if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) 28651c3c07e9STrond Myklebust goto out_zap; 28661c3c07e9STrond Myklebust cache = nfs_access_search_rbtree(inode, cred); 286757b69181STrond Myklebust err = -ENOENT; 28681c3c07e9STrond Myklebust if (cache == NULL) 28691c3c07e9STrond Myklebust goto out; 287057b69181STrond Myklebust /* Found an entry, is our attribute cache valid? */ 287121c3ba7eSTrond Myklebust if (!nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) 287257b69181STrond Myklebust break; 28735c965db8STrond Myklebust if (!retry) 28745c965db8STrond Myklebust break; 287557b69181STrond Myklebust err = -ECHILD; 287657b69181STrond Myklebust if (!may_block) 287757b69181STrond Myklebust goto out; 287857b69181STrond Myklebust spin_unlock(&inode->i_lock); 287957b69181STrond Myklebust err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 288057b69181STrond Myklebust if (err) 288157b69181STrond Myklebust return err; 288257b69181STrond Myklebust spin_lock(&inode->i_lock); 288357b69181STrond Myklebust retry = false; 288457b69181STrond Myklebust } 2885b5e7b59cSNeilBrown *mask = cache->mask; 2886cfcea3e8STrond Myklebust list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); 28871c3c07e9STrond Myklebust err = 0; 28881c3c07e9STrond Myklebust out: 28891c3c07e9STrond Myklebust spin_unlock(&inode->i_lock); 28901c3c07e9STrond Myklebust return err; 28911c3c07e9STrond Myklebust out_zap: 28921a81bb8aSTrond Myklebust spin_unlock(&inode->i_lock); 28931a81bb8aSTrond Myklebust nfs_access_zap_cache(inode); 28941c3c07e9STrond Myklebust return -ENOENT; 28951c3c07e9STrond Myklebust } 28961c3c07e9STrond Myklebust 2897b5e7b59cSNeilBrown static int nfs_access_get_cached_rcu(struct inode *inode, const struct cred *cred, u32 *mask) 2898f682a398SNeilBrown { 2899f682a398SNeilBrown /* Only check the most recently returned cache entry, 2900f682a398SNeilBrown * but do it without locking. 2901f682a398SNeilBrown */ 2902f682a398SNeilBrown struct nfs_inode *nfsi = NFS_I(inode); 2903f682a398SNeilBrown struct nfs_access_entry *cache; 2904f682a398SNeilBrown int err = -ECHILD; 2905f682a398SNeilBrown struct list_head *lh; 2906f682a398SNeilBrown 2907f682a398SNeilBrown rcu_read_lock(); 2908f682a398SNeilBrown if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) 2909f682a398SNeilBrown goto out; 29109f01eb5dSMadhuparna Bhowmik lh = rcu_dereference(list_tail_rcu(&nfsi->access_cache_entry_lru)); 2911f682a398SNeilBrown cache = list_entry(lh, struct nfs_access_entry, lru); 2912f682a398SNeilBrown if (lh == &nfsi->access_cache_entry_lru || 29136238aec8SNeilBrown access_cmp(cred, cache) != 0) 2914f682a398SNeilBrown cache = NULL; 2915f682a398SNeilBrown if (cache == NULL) 2916f682a398SNeilBrown goto out; 291721c3ba7eSTrond Myklebust if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) 2918f682a398SNeilBrown goto out; 2919b5e7b59cSNeilBrown *mask = cache->mask; 292021c3ba7eSTrond Myklebust err = 0; 2921f682a398SNeilBrown out: 2922f682a398SNeilBrown rcu_read_unlock(); 2923f682a398SNeilBrown return err; 2924f682a398SNeilBrown } 2925f682a398SNeilBrown 2926b5e7b59cSNeilBrown int nfs_access_get_cached(struct inode *inode, const struct cred *cred, 2927b5e7b59cSNeilBrown u32 *mask, bool may_block) 2928d2ae4f8bSFrank van der Linden { 2929d2ae4f8bSFrank van der Linden int status; 2930d2ae4f8bSFrank van der Linden 2931b5e7b59cSNeilBrown status = nfs_access_get_cached_rcu(inode, cred, mask); 2932d2ae4f8bSFrank van der Linden if (status != 0) 2933b5e7b59cSNeilBrown status = nfs_access_get_cached_locked(inode, cred, mask, 2934d2ae4f8bSFrank van der Linden may_block); 2935d2ae4f8bSFrank van der Linden 2936d2ae4f8bSFrank van der Linden return status; 2937d2ae4f8bSFrank van der Linden } 2938d2ae4f8bSFrank van der Linden EXPORT_SYMBOL_GPL(nfs_access_get_cached); 2939d2ae4f8bSFrank van der Linden 294073fbb3faSNeilBrown static void nfs_access_add_rbtree(struct inode *inode, 294173fbb3faSNeilBrown struct nfs_access_entry *set, 294273fbb3faSNeilBrown const struct cred *cred) 29431c3c07e9STrond Myklebust { 2944cfcea3e8STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 2945cfcea3e8STrond Myklebust struct rb_root *root_node = &nfsi->access_cache; 29461c3c07e9STrond Myklebust struct rb_node **p = &root_node->rb_node; 29471c3c07e9STrond Myklebust struct rb_node *parent = NULL; 29481c3c07e9STrond Myklebust struct nfs_access_entry *entry; 2949b68572e0SNeilBrown int cmp; 29501c3c07e9STrond Myklebust 29511c3c07e9STrond Myklebust spin_lock(&inode->i_lock); 29521c3c07e9STrond Myklebust while (*p != NULL) { 29531c3c07e9STrond Myklebust parent = *p; 29541c3c07e9STrond Myklebust entry = rb_entry(parent, struct nfs_access_entry, rb_node); 29556238aec8SNeilBrown cmp = access_cmp(cred, entry); 29561c3c07e9STrond Myklebust 2957b68572e0SNeilBrown if (cmp < 0) 29581c3c07e9STrond Myklebust p = &parent->rb_left; 2959b68572e0SNeilBrown else if (cmp > 0) 29601c3c07e9STrond Myklebust p = &parent->rb_right; 29611c3c07e9STrond Myklebust else 29621c3c07e9STrond Myklebust goto found; 29631c3c07e9STrond Myklebust } 29641c3c07e9STrond Myklebust rb_link_node(&set->rb_node, parent, p); 29651c3c07e9STrond Myklebust rb_insert_color(&set->rb_node, root_node); 2966cfcea3e8STrond Myklebust list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); 29671c3c07e9STrond Myklebust spin_unlock(&inode->i_lock); 29681c3c07e9STrond Myklebust return; 29691c3c07e9STrond Myklebust found: 29701c3c07e9STrond Myklebust rb_replace_node(parent, &set->rb_node, root_node); 2971cfcea3e8STrond Myklebust list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); 2972cfcea3e8STrond Myklebust list_del(&entry->lru); 29731c3c07e9STrond Myklebust spin_unlock(&inode->i_lock); 29741c3c07e9STrond Myklebust nfs_access_free_entry(entry); 29751da177e4SLinus Torvalds } 29761da177e4SLinus Torvalds 297773fbb3faSNeilBrown void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set, 297873fbb3faSNeilBrown const struct cred *cred) 29791da177e4SLinus Torvalds { 29801c3c07e9STrond Myklebust struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); 29811c3c07e9STrond Myklebust if (cache == NULL) 29821c3c07e9STrond Myklebust return; 29831c3c07e9STrond Myklebust RB_CLEAR_NODE(&cache->rb_node); 29846238aec8SNeilBrown cache->fsuid = cred->fsuid; 29856238aec8SNeilBrown cache->fsgid = cred->fsgid; 29866238aec8SNeilBrown cache->group_info = get_group_info(cred->group_info); 29871da177e4SLinus Torvalds cache->mask = set->mask; 29881c3c07e9STrond Myklebust 2989f682a398SNeilBrown /* The above field assignments must be visible 2990f682a398SNeilBrown * before this item appears on the lru. We cannot easily 2991f682a398SNeilBrown * use rcu_assign_pointer, so just force the memory barrier. 2992f682a398SNeilBrown */ 2993f682a398SNeilBrown smp_wmb(); 299473fbb3faSNeilBrown nfs_access_add_rbtree(inode, cache, cred); 2995cfcea3e8STrond Myklebust 2996cfcea3e8STrond Myklebust /* Update accounting */ 29974e857c58SPeter Zijlstra smp_mb__before_atomic(); 2998cfcea3e8STrond Myklebust atomic_long_inc(&nfs_access_nr_entries); 29994e857c58SPeter Zijlstra smp_mb__after_atomic(); 3000cfcea3e8STrond Myklebust 3001cfcea3e8STrond Myklebust /* Add inode to global LRU list */ 30021a81bb8aSTrond Myklebust if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { 3003cfcea3e8STrond Myklebust spin_lock(&nfs_access_lru_lock); 30041a81bb8aSTrond Myklebust if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) 30051a81bb8aSTrond Myklebust list_add_tail(&NFS_I(inode)->access_cache_inode_lru, 30061a81bb8aSTrond Myklebust &nfs_access_lru_list); 3007cfcea3e8STrond Myklebust spin_unlock(&nfs_access_lru_lock); 3008cfcea3e8STrond Myklebust } 30093a505845STrond Myklebust nfs_access_cache_enforce_limit(); 30101da177e4SLinus Torvalds } 30116168f62cSWeston Andros Adamson EXPORT_SYMBOL_GPL(nfs_access_add_cache); 30126168f62cSWeston Andros Adamson 30133c181827SAnna Schumaker #define NFS_MAY_READ (NFS_ACCESS_READ) 30143c181827SAnna Schumaker #define NFS_MAY_WRITE (NFS_ACCESS_MODIFY | \ 30153c181827SAnna Schumaker NFS_ACCESS_EXTEND | \ 30163c181827SAnna Schumaker NFS_ACCESS_DELETE) 30173c181827SAnna Schumaker #define NFS_FILE_MAY_WRITE (NFS_ACCESS_MODIFY | \ 30183c181827SAnna Schumaker NFS_ACCESS_EXTEND) 3019ecbb903cSTrond Myklebust #define NFS_DIR_MAY_WRITE NFS_MAY_WRITE 30203c181827SAnna Schumaker #define NFS_MAY_LOOKUP (NFS_ACCESS_LOOKUP) 30213c181827SAnna Schumaker #define NFS_MAY_EXECUTE (NFS_ACCESS_EXECUTE) 302215d4b73aSTrond Myklebust static int 3023ecbb903cSTrond Myklebust nfs_access_calc_mask(u32 access_result, umode_t umode) 302415d4b73aSTrond Myklebust { 302515d4b73aSTrond Myklebust int mask = 0; 302615d4b73aSTrond Myklebust 302715d4b73aSTrond Myklebust if (access_result & NFS_MAY_READ) 302815d4b73aSTrond Myklebust mask |= MAY_READ; 3029ecbb903cSTrond Myklebust if (S_ISDIR(umode)) { 3030ecbb903cSTrond Myklebust if ((access_result & NFS_DIR_MAY_WRITE) == NFS_DIR_MAY_WRITE) 303115d4b73aSTrond Myklebust mask |= MAY_WRITE; 3032ecbb903cSTrond Myklebust if ((access_result & NFS_MAY_LOOKUP) == NFS_MAY_LOOKUP) 303315d4b73aSTrond Myklebust mask |= MAY_EXEC; 3034ecbb903cSTrond Myklebust } else if (S_ISREG(umode)) { 3035ecbb903cSTrond Myklebust if ((access_result & NFS_FILE_MAY_WRITE) == NFS_FILE_MAY_WRITE) 3036ecbb903cSTrond Myklebust mask |= MAY_WRITE; 3037ecbb903cSTrond Myklebust if ((access_result & NFS_MAY_EXECUTE) == NFS_MAY_EXECUTE) 303815d4b73aSTrond Myklebust mask |= MAY_EXEC; 3039ecbb903cSTrond Myklebust } else if (access_result & NFS_MAY_WRITE) 3040ecbb903cSTrond Myklebust mask |= MAY_WRITE; 304115d4b73aSTrond Myklebust return mask; 304215d4b73aSTrond Myklebust } 304315d4b73aSTrond Myklebust 30446168f62cSWeston Andros Adamson void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result) 30456168f62cSWeston Andros Adamson { 3046bd8b2441STrond Myklebust entry->mask = access_result; 30476168f62cSWeston Andros Adamson } 30486168f62cSWeston Andros Adamson EXPORT_SYMBOL_GPL(nfs_access_set_mask); 30491da177e4SLinus Torvalds 3050b68572e0SNeilBrown static int nfs_do_access(struct inode *inode, const struct cred *cred, int mask) 30511da177e4SLinus Torvalds { 30521da177e4SLinus Torvalds struct nfs_access_entry cache; 305357b69181STrond Myklebust bool may_block = (mask & MAY_NOT_BLOCK) == 0; 3054e8194b7dSTrond Myklebust int cache_mask = -1; 30551da177e4SLinus Torvalds int status; 30561da177e4SLinus Torvalds 3057f4ce1299STrond Myklebust trace_nfs_access_enter(inode); 3058f4ce1299STrond Myklebust 3059b5e7b59cSNeilBrown status = nfs_access_get_cached(inode, cred, &cache.mask, may_block); 30601da177e4SLinus Torvalds if (status == 0) 3061f4ce1299STrond Myklebust goto out_cached; 30621da177e4SLinus Torvalds 3063f3324a2aSNeilBrown status = -ECHILD; 306457b69181STrond Myklebust if (!may_block) 3065f3324a2aSNeilBrown goto out; 3066f3324a2aSNeilBrown 30671750d929SAnna Schumaker /* 30681750d929SAnna Schumaker * Determine which access bits we want to ask for... 30691750d929SAnna Schumaker */ 307084631f84STrond Myklebust cache.mask = NFS_ACCESS_READ | NFS_ACCESS_MODIFY | NFS_ACCESS_EXTEND | 307184631f84STrond Myklebust nfs_access_xattr_mask(NFS_SERVER(inode)); 30721750d929SAnna Schumaker if (S_ISDIR(inode->i_mode)) 30731750d929SAnna Schumaker cache.mask |= NFS_ACCESS_DELETE | NFS_ACCESS_LOOKUP; 30741750d929SAnna Schumaker else 30751750d929SAnna Schumaker cache.mask |= NFS_ACCESS_EXECUTE; 307673fbb3faSNeilBrown status = NFS_PROTO(inode)->access(inode, &cache, cred); 3077a71ee337SSuresh Jayaraman if (status != 0) { 3078a71ee337SSuresh Jayaraman if (status == -ESTALE) { 3079a71ee337SSuresh Jayaraman if (!S_ISDIR(inode->i_mode)) 308093ce4af7STrond Myklebust nfs_set_inode_stale(inode); 308193ce4af7STrond Myklebust else 308293ce4af7STrond Myklebust nfs_zap_caches(inode); 3083a71ee337SSuresh Jayaraman } 3084f4ce1299STrond Myklebust goto out; 3085a71ee337SSuresh Jayaraman } 308673fbb3faSNeilBrown nfs_access_add_cache(inode, &cache, cred); 3087f4ce1299STrond Myklebust out_cached: 3088ecbb903cSTrond Myklebust cache_mask = nfs_access_calc_mask(cache.mask, inode->i_mode); 3089bd8b2441STrond Myklebust if ((mask & ~cache_mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) != 0) 3090f4ce1299STrond Myklebust status = -EACCES; 30911da177e4SLinus Torvalds out: 3092e8194b7dSTrond Myklebust trace_nfs_access_exit(inode, mask, cache_mask, status); 3093f4ce1299STrond Myklebust return status; 30941da177e4SLinus Torvalds } 30951da177e4SLinus Torvalds 3096af22f94aSTrond Myklebust static int nfs_open_permission_mask(int openflags) 3097af22f94aSTrond Myklebust { 3098af22f94aSTrond Myklebust int mask = 0; 3099af22f94aSTrond Myklebust 3100f8d9a897SWeston Andros Adamson if (openflags & __FMODE_EXEC) { 3101f8d9a897SWeston Andros Adamson /* ONLY check exec rights */ 3102f8d9a897SWeston Andros Adamson mask = MAY_EXEC; 3103f8d9a897SWeston Andros Adamson } else { 31048a5e929dSAl Viro if ((openflags & O_ACCMODE) != O_WRONLY) 3105af22f94aSTrond Myklebust mask |= MAY_READ; 31068a5e929dSAl Viro if ((openflags & O_ACCMODE) != O_RDONLY) 3107af22f94aSTrond Myklebust mask |= MAY_WRITE; 3108f8d9a897SWeston Andros Adamson } 3109f8d9a897SWeston Andros Adamson 3110af22f94aSTrond Myklebust return mask; 3111af22f94aSTrond Myklebust } 3112af22f94aSTrond Myklebust 3113b68572e0SNeilBrown int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags) 3114af22f94aSTrond Myklebust { 3115af22f94aSTrond Myklebust return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); 3116af22f94aSTrond Myklebust } 311789d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_may_open); 3118af22f94aSTrond Myklebust 31195c5fc09aSTrond Myklebust static int nfs_execute_ok(struct inode *inode, int mask) 31205c5fc09aSTrond Myklebust { 31215c5fc09aSTrond Myklebust struct nfs_server *server = NFS_SERVER(inode); 312221c3ba7eSTrond Myklebust int ret = 0; 31235c5fc09aSTrond Myklebust 31243825827eSTrond Myklebust if (S_ISDIR(inode->i_mode)) 31253825827eSTrond Myklebust return 0; 3126720869ebSTrond Myklebust if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_MODE)) { 31275c5fc09aSTrond Myklebust if (mask & MAY_NOT_BLOCK) 312821c3ba7eSTrond Myklebust return -ECHILD; 312921c3ba7eSTrond Myklebust ret = __nfs_revalidate_inode(server, inode); 313021c3ba7eSTrond Myklebust } 31315c5fc09aSTrond Myklebust if (ret == 0 && !execute_ok(inode)) 31325c5fc09aSTrond Myklebust ret = -EACCES; 31335c5fc09aSTrond Myklebust return ret; 31345c5fc09aSTrond Myklebust } 31355c5fc09aSTrond Myklebust 3136549c7297SChristian Brauner int nfs_permission(struct user_namespace *mnt_userns, 3137549c7297SChristian Brauner struct inode *inode, 3138549c7297SChristian Brauner int mask) 31391da177e4SLinus Torvalds { 3140b68572e0SNeilBrown const struct cred *cred = current_cred(); 31411da177e4SLinus Torvalds int res = 0; 31421da177e4SLinus Torvalds 314391d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSACCESS); 314491d5b470SChuck Lever 3145e6305c43SAl Viro if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) 31461da177e4SLinus Torvalds goto out; 31471da177e4SLinus Torvalds /* Is this sys_access() ? */ 31489cfcac81SEric Paris if (mask & (MAY_ACCESS | MAY_CHDIR)) 31491da177e4SLinus Torvalds goto force_lookup; 31501da177e4SLinus Torvalds 31511da177e4SLinus Torvalds switch (inode->i_mode & S_IFMT) { 31521da177e4SLinus Torvalds case S_IFLNK: 31531da177e4SLinus Torvalds goto out; 31541da177e4SLinus Torvalds case S_IFREG: 3155762674f8STrond Myklebust if ((mask & MAY_OPEN) && 3156762674f8STrond Myklebust nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN)) 3157762674f8STrond Myklebust return 0; 31581da177e4SLinus Torvalds break; 31591da177e4SLinus Torvalds case S_IFDIR: 31601da177e4SLinus Torvalds /* 31611da177e4SLinus Torvalds * Optimize away all write operations, since the server 31621da177e4SLinus Torvalds * will check permissions when we perform the op. 31631da177e4SLinus Torvalds */ 31641da177e4SLinus Torvalds if ((mask & MAY_WRITE) && !(mask & MAY_READ)) 31651da177e4SLinus Torvalds goto out; 31661da177e4SLinus Torvalds } 31671da177e4SLinus Torvalds 31681da177e4SLinus Torvalds force_lookup: 31691da177e4SLinus Torvalds if (!NFS_PROTO(inode)->access) 31701da177e4SLinus Torvalds goto out_notsup; 31711da177e4SLinus Torvalds 31721da177e4SLinus Torvalds res = nfs_do_access(inode, cred, mask); 31731da177e4SLinus Torvalds out: 31745c5fc09aSTrond Myklebust if (!res && (mask & MAY_EXEC)) 31755c5fc09aSTrond Myklebust res = nfs_execute_ok(inode, mask); 3176f696a365SMiklos Szeredi 31771e8968c5SNiels de Vos dfprintk(VFS, "NFS: permission(%s/%lu), mask=0x%x, res=%d\n", 31781e7cb3dcSChuck Lever inode->i_sb->s_id, inode->i_ino, mask, res); 31791da177e4SLinus Torvalds return res; 31801da177e4SLinus Torvalds out_notsup: 3181d51ac1a8SNeilBrown if (mask & MAY_NOT_BLOCK) 3182d51ac1a8SNeilBrown return -ECHILD; 3183d51ac1a8SNeilBrown 3184720869ebSTrond Myklebust res = nfs_revalidate_inode(inode, NFS_INO_INVALID_MODE | 3185720869ebSTrond Myklebust NFS_INO_INVALID_OTHER); 31861da177e4SLinus Torvalds if (res == 0) 318747291baaSChristian Brauner res = generic_permission(&init_user_ns, inode, mask); 31881e7cb3dcSChuck Lever goto out; 31891da177e4SLinus Torvalds } 3190ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_permission); 3191