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 21ddda8e0aSBryan Schumaker #include <linux/module.h> 221da177e4SLinus Torvalds #include <linux/time.h> 231da177e4SLinus Torvalds #include <linux/errno.h> 241da177e4SLinus Torvalds #include <linux/stat.h> 251da177e4SLinus Torvalds #include <linux/fcntl.h> 261da177e4SLinus Torvalds #include <linux/string.h> 271da177e4SLinus Torvalds #include <linux/kernel.h> 281da177e4SLinus Torvalds #include <linux/slab.h> 291da177e4SLinus Torvalds #include <linux/mm.h> 301da177e4SLinus Torvalds #include <linux/sunrpc/clnt.h> 311da177e4SLinus Torvalds #include <linux/nfs_fs.h> 321da177e4SLinus Torvalds #include <linux/nfs_mount.h> 331da177e4SLinus Torvalds #include <linux/pagemap.h> 34873101b3SChuck Lever #include <linux/pagevec.h> 351da177e4SLinus Torvalds #include <linux/namei.h> 3654ceac45SDavid Howells #include <linux/mount.h> 37a0b8cab3SMel Gorman #include <linux/swap.h> 38e8edc6e0SAlexey Dobriyan #include <linux/sched.h> 3904e4bd1cSCatalin Marinas #include <linux/kmemleak.h> 4064c2ce8bSAneesh Kumar K.V #include <linux/xattr.h> 411da177e4SLinus Torvalds 421da177e4SLinus Torvalds #include "delegation.h" 4391d5b470SChuck Lever #include "iostat.h" 444c30d56eSAdrian Bunk #include "internal.h" 45cd9a1c0eSTrond Myklebust #include "fscache.h" 461da177e4SLinus Torvalds 47f4ce1299STrond Myklebust #include "nfstrace.h" 48f4ce1299STrond Myklebust 491da177e4SLinus Torvalds /* #define NFS_DEBUG_VERBOSE 1 */ 501da177e4SLinus Torvalds 511da177e4SLinus Torvalds static int nfs_opendir(struct inode *, struct file *); 52480c2006SBryan Schumaker static int nfs_closedir(struct inode *, struct file *); 5323db8620SAl Viro static int nfs_readdir(struct file *, struct dir_context *); 5402c24a82SJosef Bacik static int nfs_fsync_dir(struct file *, loff_t, loff_t, int); 55f0dd2136STrond Myklebust static loff_t nfs_llseek_dir(struct file *, loff_t, int); 5611de3b11STrond Myklebust static void nfs_readdir_clear_array(struct page*); 571da177e4SLinus Torvalds 584b6f5d20SArjan van de Ven const struct file_operations nfs_dir_operations = { 59f0dd2136STrond Myklebust .llseek = nfs_llseek_dir, 601da177e4SLinus Torvalds .read = generic_read_dir, 6193a6ab7bSTrond Myklebust .iterate_shared = nfs_readdir, 621da177e4SLinus Torvalds .open = nfs_opendir, 63480c2006SBryan Schumaker .release = nfs_closedir, 641da177e4SLinus Torvalds .fsync = nfs_fsync_dir, 651da177e4SLinus Torvalds }; 661da177e4SLinus Torvalds 6711de3b11STrond Myklebust const struct address_space_operations nfs_dir_aops = { 6811de3b11STrond Myklebust .freepage = nfs_readdir_clear_array, 69d1bacf9eSBryan Schumaker }; 70d1bacf9eSBryan Schumaker 71*93b8959aSTrond Myklebust static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir) 72480c2006SBryan Schumaker { 73311324adSTrond Myklebust struct nfs_inode *nfsi = NFS_I(dir); 74480c2006SBryan Schumaker struct nfs_open_dir_context *ctx; 75480c2006SBryan Schumaker ctx = kmalloc(sizeof(*ctx), GFP_KERNEL); 76480c2006SBryan Schumaker if (ctx != NULL) { 778ef2ce3eSBryan Schumaker ctx->duped = 0; 78311324adSTrond Myklebust ctx->attr_gencount = nfsi->attr_gencount; 79480c2006SBryan Schumaker ctx->dir_cookie = 0; 808ef2ce3eSBryan Schumaker ctx->dup_cookie = 0; 81311324adSTrond Myklebust spin_lock(&dir->i_lock); 821c341b77STrond Myklebust if (list_empty(&nfsi->open_files) && 831c341b77STrond Myklebust (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)) 841c341b77STrond Myklebust nfsi->cache_validity |= NFS_INO_INVALID_DATA | 851c341b77STrond Myklebust NFS_INO_REVAL_FORCED; 86311324adSTrond Myklebust list_add(&ctx->list, &nfsi->open_files); 87311324adSTrond Myklebust spin_unlock(&dir->i_lock); 88480c2006SBryan Schumaker return ctx; 89480c2006SBryan Schumaker } 900c030806STrond Myklebust return ERR_PTR(-ENOMEM); 910c030806STrond Myklebust } 92480c2006SBryan Schumaker 93311324adSTrond Myklebust static void put_nfs_open_dir_context(struct inode *dir, struct nfs_open_dir_context *ctx) 94480c2006SBryan Schumaker { 95311324adSTrond Myklebust spin_lock(&dir->i_lock); 96311324adSTrond Myklebust list_del(&ctx->list); 97311324adSTrond Myklebust spin_unlock(&dir->i_lock); 98480c2006SBryan Schumaker kfree(ctx); 99480c2006SBryan Schumaker } 100480c2006SBryan Schumaker 1011da177e4SLinus Torvalds /* 1021da177e4SLinus Torvalds * Open file 1031da177e4SLinus Torvalds */ 1041da177e4SLinus Torvalds static int 1051da177e4SLinus Torvalds nfs_opendir(struct inode *inode, struct file *filp) 1061da177e4SLinus Torvalds { 107480c2006SBryan Schumaker int res = 0; 108480c2006SBryan Schumaker struct nfs_open_dir_context *ctx; 1091da177e4SLinus Torvalds 1106de1472fSAl Viro dfprintk(FILE, "NFS: open dir(%pD2)\n", filp); 111cc0dd2d1SChuck Lever 112cc0dd2d1SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSOPEN); 1131e7cb3dcSChuck Lever 114*93b8959aSTrond Myklebust ctx = alloc_nfs_open_dir_context(inode); 115480c2006SBryan Schumaker if (IS_ERR(ctx)) { 116480c2006SBryan Schumaker res = PTR_ERR(ctx); 117480c2006SBryan Schumaker goto out; 118480c2006SBryan Schumaker } 119480c2006SBryan Schumaker filp->private_data = ctx; 120480c2006SBryan Schumaker out: 1211da177e4SLinus Torvalds return res; 1221da177e4SLinus Torvalds } 1231da177e4SLinus Torvalds 124480c2006SBryan Schumaker static int 125480c2006SBryan Schumaker nfs_closedir(struct inode *inode, struct file *filp) 126480c2006SBryan Schumaker { 127a455589fSAl Viro put_nfs_open_dir_context(file_inode(filp), filp->private_data); 128480c2006SBryan Schumaker return 0; 129480c2006SBryan Schumaker } 130480c2006SBryan Schumaker 131d1bacf9eSBryan Schumaker struct nfs_cache_array_entry { 132d1bacf9eSBryan Schumaker u64 cookie; 133d1bacf9eSBryan Schumaker u64 ino; 134a52a8a6aSTrond Myklebust const char *name; 135a52a8a6aSTrond Myklebust unsigned int name_len; 1360b26a0bfSTrond Myklebust unsigned char d_type; 137d1bacf9eSBryan Schumaker }; 138d1bacf9eSBryan Schumaker 139d1bacf9eSBryan Schumaker struct nfs_cache_array { 140d1bacf9eSBryan Schumaker u64 last_cookie; 141b1e21c97STrond Myklebust unsigned int size; 142b1e21c97STrond Myklebust unsigned char page_full : 1, 143b1e21c97STrond Myklebust page_is_eof : 1; 1445601cda8SGustavo A. R. Silva struct nfs_cache_array_entry array[]; 145d1bacf9eSBryan Schumaker }; 146d1bacf9eSBryan Schumaker 1472e7a4641STrond Myklebust typedef struct nfs_readdir_descriptor { 1481da177e4SLinus Torvalds struct file *file; 1491da177e4SLinus Torvalds struct page *page; 15023db8620SAl Viro struct dir_context *ctx; 1511f1d4aa4STrond Myklebust pgoff_t page_index; 1522e7a4641STrond Myklebust u64 dir_cookie; 1530aded708STrond Myklebust u64 last_cookie; 1542e7a4641STrond Myklebust u64 dup_cookie; 155f0dd2136STrond Myklebust loff_t current_index; 15659e356a9STrond Myklebust loff_t prev_index; 157d1bacf9eSBryan Schumaker 158a1147b82STrond Myklebust unsigned long dir_verifier; 1591f4eab7eSNeil Brown unsigned long timestamp; 1604704f0e2STrond Myklebust unsigned long gencount; 1612e7a4641STrond Myklebust unsigned long attr_gencount; 162d1bacf9eSBryan Schumaker unsigned int cache_entry_index; 1632e7a4641STrond Myklebust signed char duped; 164a7a3b1e9SBenjamin Coddington bool plus; 165a7a3b1e9SBenjamin Coddington bool eof; 1661da177e4SLinus Torvalds } nfs_readdir_descriptor_t; 1671da177e4SLinus Torvalds 1681f1d4aa4STrond Myklebust static void nfs_readdir_array_init(struct nfs_cache_array *array) 1691f1d4aa4STrond Myklebust { 1701f1d4aa4STrond Myklebust memset(array, 0, sizeof(struct nfs_cache_array)); 1711f1d4aa4STrond Myklebust } 1721f1d4aa4STrond Myklebust 1731f1d4aa4STrond Myklebust static void nfs_readdir_page_init_array(struct page *page, u64 last_cookie) 1744b310319STrond Myklebust { 1754b310319STrond Myklebust struct nfs_cache_array *array; 1764b310319STrond Myklebust 1774b310319STrond Myklebust array = kmap_atomic(page); 1781f1d4aa4STrond Myklebust nfs_readdir_array_init(array); 1791f1d4aa4STrond Myklebust array->last_cookie = last_cookie; 1804b310319STrond Myklebust kunmap_atomic(array); 1814b310319STrond Myklebust } 1824b310319STrond Myklebust 183d1bacf9eSBryan Schumaker /* 184d1bacf9eSBryan Schumaker * we are freeing strings created by nfs_add_to_readdir_array() 185d1bacf9eSBryan Schumaker */ 186d1bacf9eSBryan Schumaker static 18711de3b11STrond Myklebust void nfs_readdir_clear_array(struct page *page) 188d1bacf9eSBryan Schumaker { 18911de3b11STrond Myklebust struct nfs_cache_array *array; 190d1bacf9eSBryan Schumaker int i; 1918cd51a0cSTrond Myklebust 1922b86ce2dSCong Wang array = kmap_atomic(page); 193d1bacf9eSBryan Schumaker for (i = 0; i < array->size; i++) 194a52a8a6aSTrond Myklebust kfree(array->array[i].name); 1951f1d4aa4STrond Myklebust nfs_readdir_array_init(array); 1962b86ce2dSCong Wang kunmap_atomic(array); 197d1bacf9eSBryan Schumaker } 198d1bacf9eSBryan Schumaker 199b1e21c97STrond Myklebust static void nfs_readdir_array_set_eof(struct nfs_cache_array *array) 200b1e21c97STrond Myklebust { 201b1e21c97STrond Myklebust array->page_is_eof = 1; 202b1e21c97STrond Myklebust array->page_full = 1; 203b1e21c97STrond Myklebust } 204b1e21c97STrond Myklebust 205b1e21c97STrond Myklebust static bool nfs_readdir_array_is_full(struct nfs_cache_array *array) 206b1e21c97STrond Myklebust { 207b1e21c97STrond Myklebust return array->page_full; 208b1e21c97STrond Myklebust } 209b1e21c97STrond Myklebust 210d1bacf9eSBryan Schumaker /* 211d1bacf9eSBryan Schumaker * the caller is responsible for freeing qstr.name 212d1bacf9eSBryan Schumaker * when called by nfs_readdir_add_to_array, the strings will be freed in 213d1bacf9eSBryan Schumaker * nfs_clear_readdir_array() 214d1bacf9eSBryan Schumaker */ 215a52a8a6aSTrond Myklebust static const char *nfs_readdir_copy_name(const char *name, unsigned int len) 216d1bacf9eSBryan Schumaker { 217a52a8a6aSTrond Myklebust const char *ret = kmemdup_nul(name, len, GFP_KERNEL); 218a52a8a6aSTrond Myklebust 21904e4bd1cSCatalin Marinas /* 22004e4bd1cSCatalin Marinas * Avoid a kmemleak false positive. The pointer to the name is stored 22104e4bd1cSCatalin Marinas * in a page cache page which kmemleak does not scan. 22204e4bd1cSCatalin Marinas */ 223a52a8a6aSTrond Myklebust if (ret != NULL) 224a52a8a6aSTrond Myklebust kmemleak_not_leak(ret); 225a52a8a6aSTrond Myklebust return ret; 226d1bacf9eSBryan Schumaker } 227d1bacf9eSBryan Schumaker 228b1e21c97STrond Myklebust /* 229b1e21c97STrond Myklebust * Check that the next array entry lies entirely within the page bounds 230b1e21c97STrond Myklebust */ 231b1e21c97STrond Myklebust static int nfs_readdir_array_can_expand(struct nfs_cache_array *array) 232b1e21c97STrond Myklebust { 233b1e21c97STrond Myklebust struct nfs_cache_array_entry *cache_entry; 234b1e21c97STrond Myklebust 235b1e21c97STrond Myklebust if (array->page_full) 236b1e21c97STrond Myklebust return -ENOSPC; 237b1e21c97STrond Myklebust cache_entry = &array->array[array->size + 1]; 238b1e21c97STrond Myklebust if ((char *)cache_entry - (char *)array > PAGE_SIZE) { 239b1e21c97STrond Myklebust array->page_full = 1; 240b1e21c97STrond Myklebust return -ENOSPC; 241b1e21c97STrond Myklebust } 242b1e21c97STrond Myklebust return 0; 243b1e21c97STrond Myklebust } 244b1e21c97STrond Myklebust 245d1bacf9eSBryan Schumaker static 246d1bacf9eSBryan Schumaker int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) 247d1bacf9eSBryan Schumaker { 248a52a8a6aSTrond Myklebust struct nfs_cache_array *array; 2494a201d6eSTrond Myklebust struct nfs_cache_array_entry *cache_entry; 250a52a8a6aSTrond Myklebust const char *name; 2514a201d6eSTrond Myklebust int ret; 2524a201d6eSTrond Myklebust 253a52a8a6aSTrond Myklebust name = nfs_readdir_copy_name(entry->name, entry->len); 254a52a8a6aSTrond Myklebust if (!name) 255a52a8a6aSTrond Myklebust return -ENOMEM; 256a52a8a6aSTrond Myklebust 257a52a8a6aSTrond Myklebust array = kmap_atomic(page); 258b1e21c97STrond Myklebust ret = nfs_readdir_array_can_expand(array); 259a52a8a6aSTrond Myklebust if (ret) { 260a52a8a6aSTrond Myklebust kfree(name); 2613020093fSTrond Myklebust goto out; 262a52a8a6aSTrond Myklebust } 2633020093fSTrond Myklebust 264b1e21c97STrond Myklebust cache_entry = &array->array[array->size]; 2654a201d6eSTrond Myklebust cache_entry->cookie = entry->prev_cookie; 2664a201d6eSTrond Myklebust cache_entry->ino = entry->ino; 2670b26a0bfSTrond Myklebust cache_entry->d_type = entry->d_type; 268a52a8a6aSTrond Myklebust cache_entry->name_len = entry->len; 269a52a8a6aSTrond Myklebust cache_entry->name = name; 270d1bacf9eSBryan Schumaker array->last_cookie = entry->cookie; 2718cd51a0cSTrond Myklebust array->size++; 27247c716cbSTrond Myklebust if (entry->eof != 0) 273b1e21c97STrond Myklebust nfs_readdir_array_set_eof(array); 2744a201d6eSTrond Myklebust out: 275a52a8a6aSTrond Myklebust kunmap_atomic(array); 2764a201d6eSTrond Myklebust return ret; 277d1bacf9eSBryan Schumaker } 278d1bacf9eSBryan Schumaker 2791f1d4aa4STrond Myklebust static struct page *nfs_readdir_page_get_locked(struct address_space *mapping, 2801f1d4aa4STrond Myklebust pgoff_t index, u64 last_cookie) 2811f1d4aa4STrond Myklebust { 2821f1d4aa4STrond Myklebust struct page *page; 2831f1d4aa4STrond Myklebust 2841f1d4aa4STrond Myklebust page = grab_cache_page(mapping, index); 2851f1d4aa4STrond Myklebust if (page && !PageUptodate(page)) { 2861f1d4aa4STrond Myklebust nfs_readdir_page_init_array(page, last_cookie); 2871f1d4aa4STrond Myklebust if (invalidate_inode_pages2_range(mapping, index + 1, -1) < 0) 2881f1d4aa4STrond Myklebust nfs_zap_mapping(mapping->host, mapping); 2891f1d4aa4STrond Myklebust SetPageUptodate(page); 2901f1d4aa4STrond Myklebust } 2911f1d4aa4STrond Myklebust 2921f1d4aa4STrond Myklebust return page; 2931f1d4aa4STrond Myklebust } 2941f1d4aa4STrond Myklebust 2951f1d4aa4STrond Myklebust static u64 nfs_readdir_page_last_cookie(struct page *page) 2961f1d4aa4STrond Myklebust { 2971f1d4aa4STrond Myklebust struct nfs_cache_array *array; 2981f1d4aa4STrond Myklebust u64 ret; 2991f1d4aa4STrond Myklebust 3001f1d4aa4STrond Myklebust array = kmap_atomic(page); 3011f1d4aa4STrond Myklebust ret = array->last_cookie; 3021f1d4aa4STrond Myklebust kunmap_atomic(array); 3031f1d4aa4STrond Myklebust return ret; 3041f1d4aa4STrond Myklebust } 3051f1d4aa4STrond Myklebust 3061f1d4aa4STrond Myklebust static bool nfs_readdir_page_needs_filling(struct page *page) 3071f1d4aa4STrond Myklebust { 3081f1d4aa4STrond Myklebust struct nfs_cache_array *array; 3091f1d4aa4STrond Myklebust bool ret; 3101f1d4aa4STrond Myklebust 3111f1d4aa4STrond Myklebust array = kmap_atomic(page); 3121f1d4aa4STrond Myklebust ret = !nfs_readdir_array_is_full(array); 3131f1d4aa4STrond Myklebust kunmap_atomic(array); 3141f1d4aa4STrond Myklebust return ret; 3151f1d4aa4STrond Myklebust } 3161f1d4aa4STrond Myklebust 317b1e21c97STrond Myklebust static void nfs_readdir_page_set_eof(struct page *page) 318b1e21c97STrond Myklebust { 319b1e21c97STrond Myklebust struct nfs_cache_array *array; 320b1e21c97STrond Myklebust 321b1e21c97STrond Myklebust array = kmap_atomic(page); 322b1e21c97STrond Myklebust nfs_readdir_array_set_eof(array); 323b1e21c97STrond Myklebust kunmap_atomic(array); 324b1e21c97STrond Myklebust } 325b1e21c97STrond Myklebust 3263b2a09f1STrond Myklebust static void nfs_readdir_page_unlock_and_put(struct page *page) 3273b2a09f1STrond Myklebust { 3283b2a09f1STrond Myklebust unlock_page(page); 3293b2a09f1STrond Myklebust put_page(page); 3303b2a09f1STrond Myklebust } 3313b2a09f1STrond Myklebust 3323b2a09f1STrond Myklebust static struct page *nfs_readdir_page_get_next(struct address_space *mapping, 3333b2a09f1STrond Myklebust pgoff_t index, u64 cookie) 3343b2a09f1STrond Myklebust { 3353b2a09f1STrond Myklebust struct page *page; 3363b2a09f1STrond Myklebust 3373b2a09f1STrond Myklebust page = nfs_readdir_page_get_locked(mapping, index, cookie); 3383b2a09f1STrond Myklebust if (page) { 3393b2a09f1STrond Myklebust if (nfs_readdir_page_last_cookie(page) == cookie) 3403b2a09f1STrond Myklebust return page; 3413b2a09f1STrond Myklebust nfs_readdir_page_unlock_and_put(page); 3423b2a09f1STrond Myklebust } 3433b2a09f1STrond Myklebust return NULL; 3443b2a09f1STrond Myklebust } 3453b2a09f1STrond Myklebust 34659e356a9STrond Myklebust static inline 34759e356a9STrond Myklebust int is_32bit_api(void) 34859e356a9STrond Myklebust { 34959e356a9STrond Myklebust #ifdef CONFIG_COMPAT 35059e356a9STrond Myklebust return in_compat_syscall(); 35159e356a9STrond Myklebust #else 35259e356a9STrond Myklebust return (BITS_PER_LONG == 32); 35359e356a9STrond Myklebust #endif 35459e356a9STrond Myklebust } 35559e356a9STrond Myklebust 35659e356a9STrond Myklebust static 35759e356a9STrond Myklebust bool nfs_readdir_use_cookie(const struct file *filp) 35859e356a9STrond Myklebust { 35959e356a9STrond Myklebust if ((filp->f_mode & FMODE_32BITHASH) || 36059e356a9STrond Myklebust (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) 36159e356a9STrond Myklebust return false; 36259e356a9STrond Myklebust return true; 36359e356a9STrond Myklebust } 36459e356a9STrond Myklebust 365d1bacf9eSBryan Schumaker static 366d1bacf9eSBryan Schumaker int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) 367d1bacf9eSBryan Schumaker { 36823db8620SAl Viro loff_t diff = desc->ctx->pos - desc->current_index; 369d1bacf9eSBryan Schumaker unsigned int index; 370d1bacf9eSBryan Schumaker 371d1bacf9eSBryan Schumaker if (diff < 0) 372d1bacf9eSBryan Schumaker goto out_eof; 373d1bacf9eSBryan Schumaker if (diff >= array->size) { 374b1e21c97STrond Myklebust if (array->page_is_eof) 375d1bacf9eSBryan Schumaker goto out_eof; 376d1bacf9eSBryan Schumaker return -EAGAIN; 377d1bacf9eSBryan Schumaker } 378d1bacf9eSBryan Schumaker 379d1bacf9eSBryan Schumaker index = (unsigned int)diff; 3802e7a4641STrond Myklebust desc->dir_cookie = array->array[index].cookie; 381d1bacf9eSBryan Schumaker desc->cache_entry_index = index; 382d1bacf9eSBryan Schumaker return 0; 383d1bacf9eSBryan Schumaker out_eof: 3846089dd0dSThomas Meyer desc->eof = true; 385d1bacf9eSBryan Schumaker return -EBADCOOKIE; 386d1bacf9eSBryan Schumaker } 387d1bacf9eSBryan Schumaker 3884db72b40SJeff Layton static bool 3894db72b40SJeff Layton nfs_readdir_inode_mapping_valid(struct nfs_inode *nfsi) 3904db72b40SJeff Layton { 3914db72b40SJeff Layton if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA)) 3924db72b40SJeff Layton return false; 3934db72b40SJeff Layton smp_rmb(); 3944db72b40SJeff Layton return !test_bit(NFS_INO_INVALIDATING, &nfsi->flags); 3954db72b40SJeff Layton } 3964db72b40SJeff Layton 397d1bacf9eSBryan Schumaker static 398d1bacf9eSBryan Schumaker int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) 399d1bacf9eSBryan Schumaker { 400d1bacf9eSBryan Schumaker int i; 4018ef2ce3eSBryan Schumaker loff_t new_pos; 402d1bacf9eSBryan Schumaker int status = -EAGAIN; 403d1bacf9eSBryan Schumaker 404d1bacf9eSBryan Schumaker for (i = 0; i < array->size; i++) { 4052e7a4641STrond Myklebust if (array->array[i].cookie == desc->dir_cookie) { 406496ad9aaSAl Viro struct nfs_inode *nfsi = NFS_I(file_inode(desc->file)); 4070c030806STrond Myklebust 4088ef2ce3eSBryan Schumaker new_pos = desc->current_index + i; 4092e7a4641STrond Myklebust if (desc->attr_gencount != nfsi->attr_gencount || 4104db72b40SJeff Layton !nfs_readdir_inode_mapping_valid(nfsi)) { 4112e7a4641STrond Myklebust desc->duped = 0; 4122e7a4641STrond Myklebust desc->attr_gencount = nfsi->attr_gencount; 41359e356a9STrond Myklebust } else if (new_pos < desc->prev_index) { 4142e7a4641STrond Myklebust if (desc->duped > 0 4152e7a4641STrond Myklebust && desc->dup_cookie == desc->dir_cookie) { 4160c030806STrond Myklebust if (printk_ratelimit()) { 4176de1472fSAl Viro pr_notice("NFS: directory %pD2 contains a readdir loop." 4180c030806STrond Myklebust "Please contact your server vendor. " 419a52a8a6aSTrond Myklebust "The file: %s has duplicate cookie %llu\n", 420a52a8a6aSTrond Myklebust desc->file, array->array[i].name, desc->dir_cookie); 4210c030806STrond Myklebust } 4220c030806STrond Myklebust status = -ELOOP; 4230c030806STrond Myklebust goto out; 4240c030806STrond Myklebust } 4252e7a4641STrond Myklebust desc->dup_cookie = desc->dir_cookie; 4262e7a4641STrond Myklebust desc->duped = -1; 4278ef2ce3eSBryan Schumaker } 42859e356a9STrond Myklebust if (nfs_readdir_use_cookie(desc->file)) 4292e7a4641STrond Myklebust desc->ctx->pos = desc->dir_cookie; 43059e356a9STrond Myklebust else 43123db8620SAl Viro desc->ctx->pos = new_pos; 43259e356a9STrond Myklebust desc->prev_index = new_pos; 4338cd51a0cSTrond Myklebust desc->cache_entry_index = i; 43447c716cbSTrond Myklebust return 0; 4358cd51a0cSTrond Myklebust } 4368cd51a0cSTrond Myklebust } 437b1e21c97STrond Myklebust if (array->page_is_eof) { 438d1bacf9eSBryan Schumaker status = -EBADCOOKIE; 4392e7a4641STrond Myklebust if (desc->dir_cookie == array->last_cookie) 4406089dd0dSThomas Meyer desc->eof = true; 441d1bacf9eSBryan Schumaker } 4420c030806STrond Myklebust out: 443d1bacf9eSBryan Schumaker return status; 444d1bacf9eSBryan Schumaker } 445d1bacf9eSBryan Schumaker 446d1bacf9eSBryan Schumaker static 447d1bacf9eSBryan Schumaker int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) 448d1bacf9eSBryan Schumaker { 449d1bacf9eSBryan Schumaker struct nfs_cache_array *array; 45047c716cbSTrond Myklebust int status; 451d1bacf9eSBryan Schumaker 452ed09222dSTrond Myklebust array = kmap_atomic(desc->page); 453d1bacf9eSBryan Schumaker 4542e7a4641STrond Myklebust if (desc->dir_cookie == 0) 455d1bacf9eSBryan Schumaker status = nfs_readdir_search_for_pos(array, desc); 456d1bacf9eSBryan Schumaker else 457d1bacf9eSBryan Schumaker status = nfs_readdir_search_for_cookie(array, desc); 458d1bacf9eSBryan Schumaker 45947c716cbSTrond Myklebust if (status == -EAGAIN) { 4600aded708STrond Myklebust desc->last_cookie = array->last_cookie; 461e47c085aSTrond Myklebust desc->current_index += array->size; 46247c716cbSTrond Myklebust desc->page_index++; 46347c716cbSTrond Myklebust } 464ed09222dSTrond Myklebust kunmap_atomic(array); 465d1bacf9eSBryan Schumaker return status; 466d1bacf9eSBryan Schumaker } 467d1bacf9eSBryan Schumaker 468d1bacf9eSBryan Schumaker /* Fill a page with xdr information before transferring to the cache page */ 469*93b8959aSTrond Myklebust static int nfs_readdir_xdr_filler(struct nfs_readdir_descriptor *desc, 470*93b8959aSTrond Myklebust u64 cookie, struct page **pages, 471*93b8959aSTrond Myklebust size_t bufsize) 472d1bacf9eSBryan Schumaker { 473*93b8959aSTrond Myklebust struct file *file = desc->file; 474*93b8959aSTrond Myklebust struct inode *inode = file_inode(file); 4754704f0e2STrond Myklebust unsigned long timestamp, gencount; 4761da177e4SLinus Torvalds int error; 4771da177e4SLinus Torvalds 4781da177e4SLinus Torvalds again: 4791da177e4SLinus Torvalds timestamp = jiffies; 4804704f0e2STrond Myklebust gencount = nfs_inc_attr_generation_counter(); 481a1147b82STrond Myklebust desc->dir_verifier = nfs_save_change_attribute(inode); 482*93b8959aSTrond Myklebust error = NFS_PROTO(inode)->readdir(file_dentry(file), file->f_cred, 483*93b8959aSTrond Myklebust cookie, pages, bufsize, desc->plus); 4841da177e4SLinus Torvalds if (error < 0) { 4851da177e4SLinus Torvalds /* We requested READDIRPLUS, but the server doesn't grok it */ 4861da177e4SLinus Torvalds if (error == -ENOTSUPP && desc->plus) { 4871da177e4SLinus Torvalds NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; 4883a10c30aSBenny Halevy clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); 489a7a3b1e9SBenjamin Coddington desc->plus = false; 4901da177e4SLinus Torvalds goto again; 4911da177e4SLinus Torvalds } 4921da177e4SLinus Torvalds goto error; 4931da177e4SLinus Torvalds } 4941f4eab7eSNeil Brown desc->timestamp = timestamp; 4954704f0e2STrond Myklebust desc->gencount = gencount; 496d1bacf9eSBryan Schumaker error: 497d1bacf9eSBryan Schumaker return error; 498d1bacf9eSBryan Schumaker } 499d1bacf9eSBryan Schumaker 500573c4e1eSChuck Lever static int xdr_decode(nfs_readdir_descriptor_t *desc, 501573c4e1eSChuck Lever struct nfs_entry *entry, struct xdr_stream *xdr) 502d1bacf9eSBryan Schumaker { 50359e356a9STrond Myklebust struct inode *inode = file_inode(desc->file); 504573c4e1eSChuck Lever int error; 505d1bacf9eSBryan Schumaker 50659e356a9STrond Myklebust error = NFS_PROTO(inode)->decode_dirent(xdr, entry, desc->plus); 507573c4e1eSChuck Lever if (error) 508573c4e1eSChuck Lever return error; 509d1bacf9eSBryan Schumaker entry->fattr->time_start = desc->timestamp; 510d1bacf9eSBryan Schumaker entry->fattr->gencount = desc->gencount; 511d1bacf9eSBryan Schumaker return 0; 512d1bacf9eSBryan Schumaker } 513d1bacf9eSBryan Schumaker 514fa923369STrond Myklebust /* Match file and dirent using either filehandle or fileid 515fa923369STrond Myklebust * Note: caller is responsible for checking the fsid 516fa923369STrond Myklebust */ 517d39ab9deSBryan Schumaker static 518d39ab9deSBryan Schumaker int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) 519d39ab9deSBryan Schumaker { 520d8fdb47fSTrond Myklebust struct inode *inode; 521fa923369STrond Myklebust struct nfs_inode *nfsi; 522fa923369STrond Myklebust 5232b0143b5SDavid Howells if (d_really_is_negative(dentry)) 5242b0143b5SDavid Howells return 0; 525fa923369STrond Myklebust 526d8fdb47fSTrond Myklebust inode = d_inode(dentry); 527d8fdb47fSTrond Myklebust if (is_bad_inode(inode) || NFS_STALE(inode)) 528d8fdb47fSTrond Myklebust return 0; 529d8fdb47fSTrond Myklebust 530d8fdb47fSTrond Myklebust nfsi = NFS_I(inode); 5317dc72d5fSTrond Myklebust if (entry->fattr->fileid != nfsi->fileid) 532d39ab9deSBryan Schumaker return 0; 5337dc72d5fSTrond Myklebust if (entry->fh->size && nfs_compare_fh(entry->fh, &nfsi->fh) != 0) 5347dc72d5fSTrond Myklebust return 0; 5357dc72d5fSTrond Myklebust return 1; 536d39ab9deSBryan Schumaker } 537d39ab9deSBryan Schumaker 538d39ab9deSBryan Schumaker static 53923db8620SAl Viro bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx) 540d69ee9b8STrond Myklebust { 541d69ee9b8STrond Myklebust if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) 542d69ee9b8STrond Myklebust return false; 543d69ee9b8STrond Myklebust if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) 544d69ee9b8STrond Myklebust return true; 54523db8620SAl Viro if (ctx->pos == 0) 546d69ee9b8STrond Myklebust return true; 547d69ee9b8STrond Myklebust return false; 548d69ee9b8STrond Myklebust } 549d69ee9b8STrond Myklebust 550d69ee9b8STrond Myklebust /* 55163519fbcSTrond Myklebust * This function is called by the lookup and getattr code to request the 55263519fbcSTrond Myklebust * use of readdirplus to accelerate any future lookups in the same 553d69ee9b8STrond Myklebust * directory. 554d69ee9b8STrond Myklebust */ 555d69ee9b8STrond Myklebust void nfs_advise_use_readdirplus(struct inode *dir) 556d69ee9b8STrond Myklebust { 55763519fbcSTrond Myklebust struct nfs_inode *nfsi = NFS_I(dir); 55863519fbcSTrond Myklebust 55963519fbcSTrond Myklebust if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) && 56063519fbcSTrond Myklebust !list_empty(&nfsi->open_files)) 56163519fbcSTrond Myklebust set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); 562d69ee9b8STrond Myklebust } 563d69ee9b8STrond Myklebust 564311324adSTrond Myklebust /* 565311324adSTrond Myklebust * This function is mainly for use by nfs_getattr(). 566311324adSTrond Myklebust * 567311324adSTrond Myklebust * If this is an 'ls -l', we want to force use of readdirplus. 568311324adSTrond Myklebust * Do this by checking if there is an active file descriptor 569311324adSTrond Myklebust * and calling nfs_advise_use_readdirplus, then forcing a 570311324adSTrond Myklebust * cache flush. 571311324adSTrond Myklebust */ 572311324adSTrond Myklebust void nfs_force_use_readdirplus(struct inode *dir) 573311324adSTrond Myklebust { 57463519fbcSTrond Myklebust struct nfs_inode *nfsi = NFS_I(dir); 57563519fbcSTrond Myklebust 57663519fbcSTrond Myklebust if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) && 57763519fbcSTrond Myklebust !list_empty(&nfsi->open_files)) { 57863519fbcSTrond Myklebust set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); 579227823d2SDai Ngo invalidate_mapping_pages(dir->i_mapping, 580227823d2SDai Ngo nfsi->page_index + 1, -1); 581311324adSTrond Myklebust } 582311324adSTrond Myklebust } 583311324adSTrond Myklebust 584d69ee9b8STrond Myklebust static 585a1147b82STrond Myklebust void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry, 586a1147b82STrond Myklebust unsigned long dir_verifier) 587d39ab9deSBryan Schumaker { 58826fe5750SLinus Torvalds struct qstr filename = QSTR_INIT(entry->name, entry->len); 5899ac3d3e8SAl Viro DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); 5904a201d6eSTrond Myklebust struct dentry *dentry; 5914a201d6eSTrond Myklebust struct dentry *alias; 592d39ab9deSBryan Schumaker struct inode *inode; 593aa9c2669SDavid Quigley int status; 594d39ab9deSBryan Schumaker 595fa923369STrond Myklebust if (!(entry->fattr->valid & NFS_ATTR_FATTR_FILEID)) 596fa923369STrond Myklebust return; 5976c441c25STrond Myklebust if (!(entry->fattr->valid & NFS_ATTR_FATTR_FSID)) 5986c441c25STrond Myklebust return; 59978d04af4STrond Myklebust if (filename.len == 0) 60078d04af4STrond Myklebust return; 60178d04af4STrond Myklebust /* Validate that the name doesn't contain any illegal '\0' */ 60278d04af4STrond Myklebust if (strnlen(filename.name, filename.len) != filename.len) 60378d04af4STrond Myklebust return; 60478d04af4STrond Myklebust /* ...or '/' */ 60578d04af4STrond Myklebust if (strnchr(filename.name, filename.len, '/')) 60678d04af4STrond Myklebust return; 6074a201d6eSTrond Myklebust if (filename.name[0] == '.') { 6084a201d6eSTrond Myklebust if (filename.len == 1) 6094a201d6eSTrond Myklebust return; 6104a201d6eSTrond Myklebust if (filename.len == 2 && filename.name[1] == '.') 6114a201d6eSTrond Myklebust return; 6124a201d6eSTrond Myklebust } 6138387ff25SLinus Torvalds filename.hash = full_name_hash(parent, filename.name, filename.len); 614d39ab9deSBryan Schumaker 6154a201d6eSTrond Myklebust dentry = d_lookup(parent, &filename); 6169ac3d3e8SAl Viro again: 6179ac3d3e8SAl Viro if (!dentry) { 6189ac3d3e8SAl Viro dentry = d_alloc_parallel(parent, &filename, &wq); 6199ac3d3e8SAl Viro if (IS_ERR(dentry)) 6209ac3d3e8SAl Viro return; 6219ac3d3e8SAl Viro } 6229ac3d3e8SAl Viro if (!d_in_lookup(dentry)) { 6236c441c25STrond Myklebust /* Is there a mountpoint here? If so, just exit */ 6246c441c25STrond Myklebust if (!nfs_fsid_equal(&NFS_SB(dentry->d_sb)->fsid, 6256c441c25STrond Myklebust &entry->fattr->fsid)) 6266c441c25STrond Myklebust goto out; 627d39ab9deSBryan Schumaker if (nfs_same_file(dentry, entry)) { 6287dc72d5fSTrond Myklebust if (!entry->fh->size) 6297dc72d5fSTrond Myklebust goto out; 630a1147b82STrond Myklebust nfs_set_verifier(dentry, dir_verifier); 6312b0143b5SDavid Howells status = nfs_refresh_inode(d_inode(dentry), entry->fattr); 632aa9c2669SDavid Quigley if (!status) 6332b0143b5SDavid Howells nfs_setsecurity(d_inode(dentry), entry->fattr, entry->label); 634d39ab9deSBryan Schumaker goto out; 635d39ab9deSBryan Schumaker } else { 6365542aa2fSEric W. Biederman d_invalidate(dentry); 637d39ab9deSBryan Schumaker dput(dentry); 6389ac3d3e8SAl Viro dentry = NULL; 6399ac3d3e8SAl Viro goto again; 640d39ab9deSBryan Schumaker } 641d39ab9deSBryan Schumaker } 6427dc72d5fSTrond Myklebust if (!entry->fh->size) { 6437dc72d5fSTrond Myklebust d_lookup_done(dentry); 6447dc72d5fSTrond Myklebust goto out; 6457dc72d5fSTrond Myklebust } 646d39ab9deSBryan Schumaker 6471775fd3eSDavid Quigley inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr, entry->label); 64841d28bcaSAl Viro alias = d_splice_alias(inode, dentry); 6499ac3d3e8SAl Viro d_lookup_done(dentry); 6509ac3d3e8SAl Viro if (alias) { 651d39ab9deSBryan Schumaker if (IS_ERR(alias)) 652d39ab9deSBryan Schumaker goto out; 6539ac3d3e8SAl Viro dput(dentry); 6549ac3d3e8SAl Viro dentry = alias; 6559ac3d3e8SAl Viro } 656a1147b82STrond Myklebust nfs_set_verifier(dentry, dir_verifier); 657d39ab9deSBryan Schumaker out: 658d39ab9deSBryan Schumaker dput(dentry); 659d39ab9deSBryan Schumaker } 660d39ab9deSBryan Schumaker 661d1bacf9eSBryan Schumaker /* Perform conversion from xdr to cache array */ 6623b2a09f1STrond Myklebust static int nfs_readdir_page_filler(struct nfs_readdir_descriptor *desc, 6633b2a09f1STrond Myklebust struct nfs_entry *entry, 6643b2a09f1STrond Myklebust struct page **xdr_pages, 6653b2a09f1STrond Myklebust struct page *fillme, unsigned int buflen) 666d1bacf9eSBryan Schumaker { 6673b2a09f1STrond Myklebust struct address_space *mapping = desc->file->f_mapping; 668babddc72SBryan Schumaker struct xdr_stream stream; 669f7da7a12SBenny Halevy struct xdr_buf buf; 6703b2a09f1STrond Myklebust struct page *scratch, *new, *page = fillme; 6715c346854STrond Myklebust int status; 672babddc72SBryan Schumaker 6736650239aSTrond Myklebust scratch = alloc_page(GFP_KERNEL); 6746650239aSTrond Myklebust if (scratch == NULL) 6756650239aSTrond Myklebust return -ENOMEM; 676babddc72SBryan Schumaker 677f7da7a12SBenny Halevy xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); 6786650239aSTrond Myklebust xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); 67999424380SBryan Schumaker 68099424380SBryan Schumaker do { 681d33030e2SJeffrey Mitchell if (entry->label) 682d33030e2SJeffrey Mitchell entry->label->len = NFS4_MAXLABELLEN; 683d33030e2SJeffrey Mitchell 68499424380SBryan Schumaker status = xdr_decode(desc, entry, &stream); 685972bcdf2STrond Myklebust if (status != 0) 68699424380SBryan Schumaker break; 6875c346854STrond Myklebust 688a7a3b1e9SBenjamin Coddington if (desc->plus) 689a1147b82STrond Myklebust nfs_prime_dcache(file_dentry(desc->file), entry, 690a1147b82STrond Myklebust desc->dir_verifier); 6918cd51a0cSTrond Myklebust 692db531db9SMax Kellermann status = nfs_readdir_add_to_array(entry, page); 6933b2a09f1STrond Myklebust if (status != -ENOSPC) 6943b2a09f1STrond Myklebust continue; 6953b2a09f1STrond Myklebust 6963b2a09f1STrond Myklebust if (page->mapping != mapping) 6973b2a09f1STrond Myklebust break; 6983b2a09f1STrond Myklebust new = nfs_readdir_page_get_next(mapping, page->index + 1, 6993b2a09f1STrond Myklebust entry->prev_cookie); 7003b2a09f1STrond Myklebust if (!new) 7013b2a09f1STrond Myklebust break; 7023b2a09f1STrond Myklebust if (page != fillme) 7033b2a09f1STrond Myklebust nfs_readdir_page_unlock_and_put(page); 7043b2a09f1STrond Myklebust page = new; 7053b2a09f1STrond Myklebust status = nfs_readdir_add_to_array(entry, page); 706972bcdf2STrond Myklebust } while (!status && !entry->eof); 70799424380SBryan Schumaker 708972bcdf2STrond Myklebust switch (status) { 709972bcdf2STrond Myklebust case -EBADCOOKIE: 710972bcdf2STrond Myklebust if (entry->eof) { 711b1e21c97STrond Myklebust nfs_readdir_page_set_eof(page); 71299424380SBryan Schumaker status = 0; 71356e4ebf8SBryan Schumaker } 714972bcdf2STrond Myklebust break; 715972bcdf2STrond Myklebust case -ENOSPC: 716972bcdf2STrond Myklebust case -EAGAIN: 717972bcdf2STrond Myklebust status = 0; 718972bcdf2STrond Myklebust break; 719972bcdf2STrond Myklebust } 7206650239aSTrond Myklebust 7213b2a09f1STrond Myklebust if (page != fillme) 7223b2a09f1STrond Myklebust nfs_readdir_page_unlock_and_put(page); 7233b2a09f1STrond Myklebust 7246650239aSTrond Myklebust put_page(scratch); 7258cd51a0cSTrond Myklebust return status; 7268cd51a0cSTrond Myklebust } 72756e4ebf8SBryan Schumaker 7281a34c8c9STrond Myklebust static void nfs_readdir_free_pages(struct page **pages, size_t npages) 72956e4ebf8SBryan Schumaker { 7301a34c8c9STrond Myklebust while (npages--) 7311a34c8c9STrond Myklebust put_page(pages[npages]); 7321a34c8c9STrond Myklebust kfree(pages); 73356e4ebf8SBryan Schumaker } 73456e4ebf8SBryan Schumaker 73556e4ebf8SBryan Schumaker /* 736bf211ca1Szhangliguang * nfs_readdir_alloc_pages() will allocate pages that must be freed with a call 737bf211ca1Szhangliguang * to nfs_readdir_free_pages() 73856e4ebf8SBryan Schumaker */ 7391a34c8c9STrond Myklebust static struct page **nfs_readdir_alloc_pages(size_t npages) 74056e4ebf8SBryan Schumaker { 7411a34c8c9STrond Myklebust struct page **pages; 7421a34c8c9STrond Myklebust size_t i; 74356e4ebf8SBryan Schumaker 7441a34c8c9STrond Myklebust pages = kmalloc_array(npages, sizeof(*pages), GFP_KERNEL); 7451a34c8c9STrond Myklebust if (!pages) 7461a34c8c9STrond Myklebust return NULL; 74756e4ebf8SBryan Schumaker for (i = 0; i < npages; i++) { 74856e4ebf8SBryan Schumaker struct page *page = alloc_page(GFP_KERNEL); 74956e4ebf8SBryan Schumaker if (page == NULL) 75056e4ebf8SBryan Schumaker goto out_freepages; 75156e4ebf8SBryan Schumaker pages[i] = page; 75256e4ebf8SBryan Schumaker } 7531a34c8c9STrond Myklebust return pages; 75456e4ebf8SBryan Schumaker 75556e4ebf8SBryan Schumaker out_freepages: 756c7e9668eSAnna Schumaker nfs_readdir_free_pages(pages, i); 7571a34c8c9STrond Myklebust return NULL; 758d1bacf9eSBryan Schumaker } 759d1bacf9eSBryan Schumaker 760d1bacf9eSBryan Schumaker static 761d1bacf9eSBryan Schumaker int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) 762d1bacf9eSBryan Schumaker { 7631a34c8c9STrond Myklebust struct page **pages; 764d1bacf9eSBryan Schumaker struct nfs_entry entry; 7651a34c8c9STrond Myklebust size_t array_size; 7661a34c8c9STrond Myklebust size_t dtsize = NFS_SERVER(inode)->dtsize; 7678cd51a0cSTrond Myklebust int status = -ENOMEM; 768d1bacf9eSBryan Schumaker 769d1bacf9eSBryan Schumaker entry.prev_cookie = 0; 7701f1d4aa4STrond Myklebust entry.cookie = nfs_readdir_page_last_cookie(page); 771d1bacf9eSBryan Schumaker entry.eof = 0; 772d1bacf9eSBryan Schumaker entry.fh = nfs_alloc_fhandle(); 773d1bacf9eSBryan Schumaker entry.fattr = nfs_alloc_fattr(); 774573c4e1eSChuck Lever entry.server = NFS_SERVER(inode); 775d1bacf9eSBryan Schumaker if (entry.fh == NULL || entry.fattr == NULL) 776d1bacf9eSBryan Schumaker goto out; 777d1bacf9eSBryan Schumaker 77814c43f76SDavid Quigley entry.label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); 77914c43f76SDavid Quigley if (IS_ERR(entry.label)) { 78014c43f76SDavid Quigley status = PTR_ERR(entry.label); 78114c43f76SDavid Quigley goto out; 78214c43f76SDavid Quigley } 78314c43f76SDavid Quigley 7841a34c8c9STrond Myklebust array_size = (dtsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 7851a34c8c9STrond Myklebust pages = nfs_readdir_alloc_pages(array_size); 7861a34c8c9STrond Myklebust if (!pages) 787e762a639STrond Myklebust goto out_release_label; 7881a34c8c9STrond Myklebust 789d1bacf9eSBryan Schumaker do { 790ac396128STrond Myklebust unsigned int pglen; 791*93b8959aSTrond Myklebust status = nfs_readdir_xdr_filler(desc, entry.cookie, 792*93b8959aSTrond Myklebust pages, dtsize); 793d1bacf9eSBryan Schumaker if (status < 0) 794d1bacf9eSBryan Schumaker break; 795972bcdf2STrond Myklebust 796ac396128STrond Myklebust pglen = status; 797972bcdf2STrond Myklebust if (pglen == 0) { 798972bcdf2STrond Myklebust nfs_readdir_page_set_eof(page); 7998cd51a0cSTrond Myklebust break; 8008cd51a0cSTrond Myklebust } 801972bcdf2STrond Myklebust 802972bcdf2STrond Myklebust status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); 803e762a639STrond Myklebust } while (!status && nfs_readdir_page_needs_filling(page)); 804d1bacf9eSBryan Schumaker 805c7e9668eSAnna Schumaker nfs_readdir_free_pages(pages, array_size); 806e762a639STrond Myklebust out_release_label: 80714c43f76SDavid Quigley nfs4_label_free(entry.label); 808d1bacf9eSBryan Schumaker out: 809d1bacf9eSBryan Schumaker nfs_free_fattr(entry.fattr); 810d1bacf9eSBryan Schumaker nfs_free_fhandle(entry.fh); 811d1bacf9eSBryan Schumaker return status; 812d1bacf9eSBryan Schumaker } 813d1bacf9eSBryan Schumaker 8141f1d4aa4STrond Myklebust static void nfs_readdir_page_put(struct nfs_readdir_descriptor *desc) 8151da177e4SLinus Torvalds { 81609cbfeafSKirill A. Shutemov put_page(desc->page); 8171da177e4SLinus Torvalds desc->page = NULL; 8181da177e4SLinus Torvalds } 8191da177e4SLinus Torvalds 8201f1d4aa4STrond Myklebust static void 8211f1d4aa4STrond Myklebust nfs_readdir_page_unlock_and_put_cached(struct nfs_readdir_descriptor *desc) 8221da177e4SLinus Torvalds { 8231f1d4aa4STrond Myklebust unlock_page(desc->page); 8241f1d4aa4STrond Myklebust nfs_readdir_page_put(desc); 8251f1d4aa4STrond Myklebust } 8261f1d4aa4STrond Myklebust 8271f1d4aa4STrond Myklebust static struct page * 8281f1d4aa4STrond Myklebust nfs_readdir_page_get_cached(struct nfs_readdir_descriptor *desc) 8291f1d4aa4STrond Myklebust { 8301f1d4aa4STrond Myklebust return nfs_readdir_page_get_locked(desc->file->f_mapping, 8311f1d4aa4STrond Myklebust desc->page_index, 8321f1d4aa4STrond Myklebust desc->last_cookie); 8331da177e4SLinus Torvalds } 8341da177e4SLinus Torvalds 8351da177e4SLinus Torvalds /* 836d1bacf9eSBryan Schumaker * Returns 0 if desc->dir_cookie was found on page desc->page_index 837114de382STrond Myklebust * and locks the page to prevent removal from the page cache. 8381da177e4SLinus Torvalds */ 839d1bacf9eSBryan Schumaker static 840114de382STrond Myklebust int find_and_lock_cache_page(nfs_readdir_descriptor_t *desc) 841d1bacf9eSBryan Schumaker { 842227823d2SDai Ngo struct inode *inode = file_inode(desc->file); 843227823d2SDai Ngo struct nfs_inode *nfsi = NFS_I(inode); 844d1bacf9eSBryan Schumaker int res; 845d1bacf9eSBryan Schumaker 8461f1d4aa4STrond Myklebust desc->page = nfs_readdir_page_get_cached(desc); 8471f1d4aa4STrond Myklebust if (!desc->page) 8481f1d4aa4STrond Myklebust return -ENOMEM; 8491f1d4aa4STrond Myklebust if (nfs_readdir_page_needs_filling(desc->page)) { 8501f1d4aa4STrond Myklebust res = nfs_readdir_xdr_to_array(desc, desc->page, inode); 8511f1d4aa4STrond Myklebust if (res < 0) 852114de382STrond Myklebust goto error; 8531f1d4aa4STrond Myklebust } 854114de382STrond Myklebust res = nfs_readdir_search_array(desc); 855227823d2SDai Ngo if (res == 0) { 856227823d2SDai Ngo nfsi->page_index = desc->page_index; 857114de382STrond Myklebust return 0; 858114de382STrond Myklebust } 859114de382STrond Myklebust error: 8601f1d4aa4STrond Myklebust nfs_readdir_page_unlock_and_put_cached(desc); 861d1bacf9eSBryan Schumaker return res; 862d1bacf9eSBryan Schumaker } 863d1bacf9eSBryan Schumaker 864d1bacf9eSBryan Schumaker /* Search for desc->dir_cookie from the beginning of the page cache */ 8651da177e4SLinus Torvalds static inline 8661da177e4SLinus Torvalds int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) 8671da177e4SLinus Torvalds { 8688cd51a0cSTrond Myklebust int res; 869d1bacf9eSBryan Schumaker 8700aded708STrond Myklebust if (desc->page_index == 0) { 8718cd51a0cSTrond Myklebust desc->current_index = 0; 87259e356a9STrond Myklebust desc->prev_index = 0; 8730aded708STrond Myklebust desc->last_cookie = 0; 8740aded708STrond Myklebust } 87547c716cbSTrond Myklebust do { 876114de382STrond Myklebust res = find_and_lock_cache_page(desc); 87747c716cbSTrond Myklebust } while (res == -EAGAIN); 8781da177e4SLinus Torvalds return res; 8791da177e4SLinus Torvalds } 8801da177e4SLinus Torvalds 8811da177e4SLinus Torvalds /* 8821da177e4SLinus Torvalds * Once we've found the start of the dirent within a page: fill 'er up... 8831da177e4SLinus Torvalds */ 8841da177e4SLinus Torvalds static 88523db8620SAl Viro int nfs_do_filldir(nfs_readdir_descriptor_t *desc) 8861da177e4SLinus Torvalds { 8871da177e4SLinus Torvalds struct file *file = desc->file; 888d1bacf9eSBryan Schumaker int i = 0; 889d1bacf9eSBryan Schumaker int res = 0; 890d1bacf9eSBryan Schumaker struct nfs_cache_array *array = NULL; 8918ef2ce3eSBryan Schumaker 8920795bf83SFabian Frederick array = kmap(desc->page); 893d1bacf9eSBryan Schumaker for (i = desc->cache_entry_index; i < array->size; i++) { 894ece0b423STrond Myklebust struct nfs_cache_array_entry *ent; 8951da177e4SLinus Torvalds 896ece0b423STrond Myklebust ent = &array->array[i]; 897a52a8a6aSTrond Myklebust if (!dir_emit(desc->ctx, ent->name, ent->name_len, 89823db8620SAl Viro nfs_compat_user_ino64(ent->ino), ent->d_type)) { 8996089dd0dSThomas Meyer desc->eof = true; 9001da177e4SLinus Torvalds break; 901ece0b423STrond Myklebust } 902d1bacf9eSBryan Schumaker if (i < (array->size-1)) 9032e7a4641STrond Myklebust desc->dir_cookie = array->array[i+1].cookie; 904d1bacf9eSBryan Schumaker else 9052e7a4641STrond Myklebust desc->dir_cookie = array->last_cookie; 90659e356a9STrond Myklebust if (nfs_readdir_use_cookie(file)) 9072e7a4641STrond Myklebust desc->ctx->pos = desc->dir_cookie; 90859e356a9STrond Myklebust else 90959e356a9STrond Myklebust desc->ctx->pos++; 9102e7a4641STrond Myklebust if (desc->duped != 0) 9112e7a4641STrond Myklebust desc->duped = 1; 9128cd51a0cSTrond Myklebust } 913b1e21c97STrond Myklebust if (array->page_is_eof) 9146089dd0dSThomas Meyer desc->eof = true; 915d1bacf9eSBryan Schumaker 9160795bf83SFabian Frederick kunmap(desc->page); 9171e7cb3dcSChuck Lever dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", 9182e7a4641STrond Myklebust (unsigned long long)desc->dir_cookie, res); 9191da177e4SLinus Torvalds return res; 9201da177e4SLinus Torvalds } 9211da177e4SLinus Torvalds 9221da177e4SLinus Torvalds /* 9231da177e4SLinus Torvalds * If we cannot find a cookie in our cache, we suspect that this is 9241da177e4SLinus Torvalds * because it points to a deleted file, so we ask the server to return 9251da177e4SLinus Torvalds * whatever it thinks is the next entry. We then feed this to filldir. 9261da177e4SLinus Torvalds * If all goes well, we should then be able to find our way round the 9271da177e4SLinus Torvalds * cache on the next call to readdir_search_pagecache(); 9281da177e4SLinus Torvalds * 9291da177e4SLinus Torvalds * NOTE: we cannot add the anonymous page to the pagecache because 9301da177e4SLinus Torvalds * the data it contains might not be page aligned. Besides, 9311da177e4SLinus Torvalds * we should already have a complete representation of the 9321da177e4SLinus Torvalds * directory in the page cache by the time we get here. 9331da177e4SLinus Torvalds */ 9341da177e4SLinus Torvalds static inline 93523db8620SAl Viro int uncached_readdir(nfs_readdir_descriptor_t *desc) 9361da177e4SLinus Torvalds { 9371da177e4SLinus Torvalds struct page *page = NULL; 9381da177e4SLinus Torvalds int status; 939496ad9aaSAl Viro struct inode *inode = file_inode(desc->file); 9401da177e4SLinus Torvalds 9411e7cb3dcSChuck Lever dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", 9422e7a4641STrond Myklebust (unsigned long long)desc->dir_cookie); 9431da177e4SLinus Torvalds 9441da177e4SLinus Torvalds page = alloc_page(GFP_HIGHUSER); 9451da177e4SLinus Torvalds if (!page) { 9461da177e4SLinus Torvalds status = -ENOMEM; 9471da177e4SLinus Torvalds goto out; 9481da177e4SLinus Torvalds } 9491da177e4SLinus Torvalds 9507a8e1dc3STrond Myklebust desc->page_index = 0; 9512e7a4641STrond Myklebust desc->last_cookie = desc->dir_cookie; 9527a8e1dc3STrond Myklebust desc->page = page; 9532e7a4641STrond Myklebust desc->duped = 0; 9547a8e1dc3STrond Myklebust 9551f1d4aa4STrond Myklebust nfs_readdir_page_init_array(page, desc->dir_cookie); 95685f8607eSTrond Myklebust status = nfs_readdir_xdr_to_array(desc, page, inode); 95785f8607eSTrond Myklebust if (status < 0) 958d1bacf9eSBryan Schumaker goto out_release; 959d1bacf9eSBryan Schumaker 96023db8620SAl Viro status = nfs_do_filldir(desc); 9611da177e4SLinus Torvalds 962114de382STrond Myklebust out_release: 963114de382STrond Myklebust nfs_readdir_clear_array(desc->page); 9641f1d4aa4STrond Myklebust nfs_readdir_page_put(desc); 9651da177e4SLinus Torvalds out: 9661e7cb3dcSChuck Lever dfprintk(DIRCACHE, "NFS: %s: returns %d\n", 9673110ff80SHarvey Harrison __func__, status); 9681da177e4SLinus Torvalds return status; 9691da177e4SLinus Torvalds } 9701da177e4SLinus Torvalds 97100a92642SOlivier Galibert /* The file offset position represents the dirent entry number. A 97200a92642SOlivier Galibert last cookie cache takes care of the common case of reading the 97300a92642SOlivier Galibert whole directory. 9741da177e4SLinus Torvalds */ 97523db8620SAl Viro static int nfs_readdir(struct file *file, struct dir_context *ctx) 9761da177e4SLinus Torvalds { 977be62a1a8SMiklos Szeredi struct dentry *dentry = file_dentry(file); 9782b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 97923db8620SAl Viro struct nfs_open_dir_context *dir_ctx = file->private_data; 98059e356a9STrond Myklebust nfs_readdir_descriptor_t my_desc = { 98159e356a9STrond Myklebust .file = file, 98259e356a9STrond Myklebust .ctx = ctx, 98359e356a9STrond Myklebust .plus = nfs_use_readdirplus(inode, ctx), 98459e356a9STrond Myklebust }, 98559e356a9STrond Myklebust *desc = &my_desc; 98607b5ce8eSScott Mayhew int res = 0; 9871da177e4SLinus Torvalds 9886de1472fSAl Viro dfprintk(FILE, "NFS: readdir(%pD2) starting at cookie %llu\n", 9896de1472fSAl Viro file, (long long)ctx->pos); 99091d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); 99191d5b470SChuck Lever 9921da177e4SLinus Torvalds /* 99323db8620SAl Viro * ctx->pos points to the dirent entry number. 994f0dd2136STrond Myklebust * *desc->dir_cookie has the cookie for the next entry. We have 99500a92642SOlivier Galibert * to either find the entry with the appropriate number or 99600a92642SOlivier Galibert * revalidate the cookie. 9971da177e4SLinus Torvalds */ 99879f687a3STrond Myklebust if (ctx->pos == 0 || nfs_attribute_cache_expired(inode)) 99923db8620SAl Viro res = nfs_revalidate_mapping(inode, file->f_mapping); 1000fccca7fcSTrond Myklebust if (res < 0) 1001fccca7fcSTrond Myklebust goto out; 1002fccca7fcSTrond Myklebust 10032e7a4641STrond Myklebust spin_lock(&file->f_lock); 10042e7a4641STrond Myklebust desc->dir_cookie = dir_ctx->dir_cookie; 10052e7a4641STrond Myklebust desc->dup_cookie = dir_ctx->dup_cookie; 10062e7a4641STrond Myklebust desc->duped = dir_ctx->duped; 10072e7a4641STrond Myklebust desc->attr_gencount = dir_ctx->attr_gencount; 10082e7a4641STrond Myklebust spin_unlock(&file->f_lock); 10092e7a4641STrond Myklebust 101047c716cbSTrond Myklebust do { 10111da177e4SLinus Torvalds res = readdir_search_pagecache(desc); 101200a92642SOlivier Galibert 10131da177e4SLinus Torvalds if (res == -EBADCOOKIE) { 1014ece0b423STrond Myklebust res = 0; 10151da177e4SLinus Torvalds /* This means either end of directory */ 10162e7a4641STrond Myklebust if (desc->dir_cookie && !desc->eof) { 10171da177e4SLinus Torvalds /* Or that the server has 'lost' a cookie */ 101823db8620SAl Viro res = uncached_readdir(desc); 1019ece0b423STrond Myklebust if (res == 0) 10201da177e4SLinus Torvalds continue; 10211da177e4SLinus Torvalds } 10221da177e4SLinus Torvalds break; 10231da177e4SLinus Torvalds } 10241da177e4SLinus Torvalds if (res == -ETOOSMALL && desc->plus) { 10253a10c30aSBenny Halevy clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); 10261da177e4SLinus Torvalds nfs_zap_caches(inode); 1027baf57a09STrond Myklebust desc->page_index = 0; 1028a7a3b1e9SBenjamin Coddington desc->plus = false; 1029a7a3b1e9SBenjamin Coddington desc->eof = false; 10301da177e4SLinus Torvalds continue; 10311da177e4SLinus Torvalds } 10321da177e4SLinus Torvalds if (res < 0) 10331da177e4SLinus Torvalds break; 10341da177e4SLinus Torvalds 103523db8620SAl Viro res = nfs_do_filldir(desc); 10361f1d4aa4STrond Myklebust nfs_readdir_page_unlock_and_put_cached(desc); 1037ece0b423STrond Myklebust if (res < 0) 10381da177e4SLinus Torvalds break; 103947c716cbSTrond Myklebust } while (!desc->eof); 10402e7a4641STrond Myklebust 10412e7a4641STrond Myklebust spin_lock(&file->f_lock); 10422e7a4641STrond Myklebust dir_ctx->dir_cookie = desc->dir_cookie; 10432e7a4641STrond Myklebust dir_ctx->dup_cookie = desc->dup_cookie; 10442e7a4641STrond Myklebust dir_ctx->duped = desc->duped; 10452e7a4641STrond Myklebust dir_ctx->attr_gencount = desc->attr_gencount; 10462e7a4641STrond Myklebust spin_unlock(&file->f_lock); 10472e7a4641STrond Myklebust 1048fccca7fcSTrond Myklebust out: 10491e7cb3dcSChuck Lever if (res > 0) 10501e7cb3dcSChuck Lever res = 0; 10516de1472fSAl Viro dfprintk(FILE, "NFS: readdir(%pD2) returns %d\n", file, res); 10521da177e4SLinus Torvalds return res; 10531da177e4SLinus Torvalds } 10541da177e4SLinus Torvalds 1055965c8e59SAndrew Morton static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence) 1056f0dd2136STrond Myklebust { 1057480c2006SBryan Schumaker struct nfs_open_dir_context *dir_ctx = filp->private_data; 1058b84e06c5SChuck Lever 10596de1472fSAl Viro dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n", 10606de1472fSAl Viro filp, offset, whence); 1061b84e06c5SChuck Lever 1062965c8e59SAndrew Morton switch (whence) { 1063f0dd2136STrond Myklebust default: 1064b2b1ff3dSTrond Myklebust return -EINVAL; 1065b2b1ff3dSTrond Myklebust case SEEK_SET: 1066b2b1ff3dSTrond Myklebust if (offset < 0) 1067b2b1ff3dSTrond Myklebust return -EINVAL; 106883f2c45eSTrond Myklebust spin_lock(&filp->f_lock); 1069b2b1ff3dSTrond Myklebust break; 1070b2b1ff3dSTrond Myklebust case SEEK_CUR: 1071b2b1ff3dSTrond Myklebust if (offset == 0) 1072b2b1ff3dSTrond Myklebust return filp->f_pos; 107383f2c45eSTrond Myklebust spin_lock(&filp->f_lock); 1074b2b1ff3dSTrond Myklebust offset += filp->f_pos; 1075b2b1ff3dSTrond Myklebust if (offset < 0) { 107683f2c45eSTrond Myklebust spin_unlock(&filp->f_lock); 1077b2b1ff3dSTrond Myklebust return -EINVAL; 1078b2b1ff3dSTrond Myklebust } 1079f0dd2136STrond Myklebust } 1080f0dd2136STrond Myklebust if (offset != filp->f_pos) { 1081f0dd2136STrond Myklebust filp->f_pos = offset; 108259e356a9STrond Myklebust if (nfs_readdir_use_cookie(filp)) 108359e356a9STrond Myklebust dir_ctx->dir_cookie = offset; 108459e356a9STrond Myklebust else 1085480c2006SBryan Schumaker dir_ctx->dir_cookie = 0; 10868ef2ce3eSBryan Schumaker dir_ctx->duped = 0; 1087f0dd2136STrond Myklebust } 108883f2c45eSTrond Myklebust spin_unlock(&filp->f_lock); 1089f0dd2136STrond Myklebust return offset; 1090f0dd2136STrond Myklebust } 1091f0dd2136STrond Myklebust 10921da177e4SLinus Torvalds /* 10931da177e4SLinus Torvalds * All directory operations under NFS are synchronous, so fsync() 10941da177e4SLinus Torvalds * is a dummy operation. 10951da177e4SLinus Torvalds */ 109602c24a82SJosef Bacik static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, 109702c24a82SJosef Bacik int datasync) 10981da177e4SLinus Torvalds { 10996de1472fSAl Viro dfprintk(FILE, "NFS: fsync dir(%pD2) datasync %d\n", filp, datasync); 11001e7cb3dcSChuck Lever 110111decaf8STrond Myklebust nfs_inc_stats(file_inode(filp), NFSIOS_VFSFSYNC); 11021da177e4SLinus Torvalds return 0; 11031da177e4SLinus Torvalds } 11041da177e4SLinus Torvalds 1105bfc69a45STrond Myklebust /** 1106bfc69a45STrond Myklebust * nfs_force_lookup_revalidate - Mark the directory as having changed 1107302fad7bSTrond Myklebust * @dir: pointer to directory inode 1108bfc69a45STrond Myklebust * 1109bfc69a45STrond Myklebust * This forces the revalidation code in nfs_lookup_revalidate() to do a 1110bfc69a45STrond Myklebust * full lookup on all child dentries of 'dir' whenever a change occurs 1111bfc69a45STrond Myklebust * on the server that might have invalidated our dcache. 1112bfc69a45STrond Myklebust * 1113efeda80dSTrond Myklebust * Note that we reserve bit '0' as a tag to let us know when a dentry 1114efeda80dSTrond Myklebust * was revalidated while holding a delegation on its inode. 1115efeda80dSTrond Myklebust * 1116bfc69a45STrond Myklebust * The caller should be holding dir->i_lock 1117bfc69a45STrond Myklebust */ 1118bfc69a45STrond Myklebust void nfs_force_lookup_revalidate(struct inode *dir) 1119bfc69a45STrond Myklebust { 1120efeda80dSTrond Myklebust NFS_I(dir)->cache_change_attribute += 2; 1121bfc69a45STrond Myklebust } 112289d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate); 1123bfc69a45STrond Myklebust 1124efeda80dSTrond Myklebust /** 1125efeda80dSTrond Myklebust * nfs_verify_change_attribute - Detects NFS remote directory changes 1126efeda80dSTrond Myklebust * @dir: pointer to parent directory inode 1127efeda80dSTrond Myklebust * @verf: previously saved change attribute 1128efeda80dSTrond Myklebust * 1129efeda80dSTrond Myklebust * Return "false" if the verifiers doesn't match the change attribute. 1130efeda80dSTrond Myklebust * This would usually indicate that the directory contents have changed on 1131efeda80dSTrond Myklebust * the server, and that any dentries need revalidating. 1132efeda80dSTrond Myklebust */ 1133efeda80dSTrond Myklebust static bool nfs_verify_change_attribute(struct inode *dir, unsigned long verf) 1134efeda80dSTrond Myklebust { 1135efeda80dSTrond Myklebust return (verf & ~1UL) == nfs_save_change_attribute(dir); 1136efeda80dSTrond Myklebust } 1137efeda80dSTrond Myklebust 1138efeda80dSTrond Myklebust static void nfs_set_verifier_delegated(unsigned long *verf) 1139efeda80dSTrond Myklebust { 1140efeda80dSTrond Myklebust *verf |= 1UL; 1141efeda80dSTrond Myklebust } 1142efeda80dSTrond Myklebust 1143efeda80dSTrond Myklebust #if IS_ENABLED(CONFIG_NFS_V4) 1144efeda80dSTrond Myklebust static void nfs_unset_verifier_delegated(unsigned long *verf) 1145efeda80dSTrond Myklebust { 1146efeda80dSTrond Myklebust *verf &= ~1UL; 1147efeda80dSTrond Myklebust } 1148efeda80dSTrond Myklebust #endif /* IS_ENABLED(CONFIG_NFS_V4) */ 1149efeda80dSTrond Myklebust 1150efeda80dSTrond Myklebust static bool nfs_test_verifier_delegated(unsigned long verf) 1151efeda80dSTrond Myklebust { 1152efeda80dSTrond Myklebust return verf & 1; 1153efeda80dSTrond Myklebust } 1154efeda80dSTrond Myklebust 1155efeda80dSTrond Myklebust static bool nfs_verifier_is_delegated(struct dentry *dentry) 1156efeda80dSTrond Myklebust { 1157efeda80dSTrond Myklebust return nfs_test_verifier_delegated(dentry->d_time); 1158efeda80dSTrond Myklebust } 1159efeda80dSTrond Myklebust 1160efeda80dSTrond Myklebust static void nfs_set_verifier_locked(struct dentry *dentry, unsigned long verf) 1161efeda80dSTrond Myklebust { 1162efeda80dSTrond Myklebust struct inode *inode = d_inode(dentry); 1163efeda80dSTrond Myklebust 1164efeda80dSTrond Myklebust if (!nfs_verifier_is_delegated(dentry) && 1165efeda80dSTrond Myklebust !nfs_verify_change_attribute(d_inode(dentry->d_parent), verf)) 1166efeda80dSTrond Myklebust goto out; 1167efeda80dSTrond Myklebust if (inode && NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1168efeda80dSTrond Myklebust nfs_set_verifier_delegated(&verf); 1169efeda80dSTrond Myklebust out: 1170efeda80dSTrond Myklebust dentry->d_time = verf; 1171efeda80dSTrond Myklebust } 1172efeda80dSTrond Myklebust 1173efeda80dSTrond Myklebust /** 1174efeda80dSTrond Myklebust * nfs_set_verifier - save a parent directory verifier in the dentry 1175efeda80dSTrond Myklebust * @dentry: pointer to dentry 1176efeda80dSTrond Myklebust * @verf: verifier to save 1177efeda80dSTrond Myklebust * 1178efeda80dSTrond Myklebust * Saves the parent directory verifier in @dentry. If the inode has 1179efeda80dSTrond Myklebust * a delegation, we also tag the dentry as having been revalidated 1180efeda80dSTrond Myklebust * while holding a delegation so that we know we don't have to 1181efeda80dSTrond Myklebust * look it up again after a directory change. 1182efeda80dSTrond Myklebust */ 1183efeda80dSTrond Myklebust void nfs_set_verifier(struct dentry *dentry, unsigned long verf) 1184efeda80dSTrond Myklebust { 1185efeda80dSTrond Myklebust 1186efeda80dSTrond Myklebust spin_lock(&dentry->d_lock); 1187efeda80dSTrond Myklebust nfs_set_verifier_locked(dentry, verf); 1188efeda80dSTrond Myklebust spin_unlock(&dentry->d_lock); 1189efeda80dSTrond Myklebust } 1190efeda80dSTrond Myklebust EXPORT_SYMBOL_GPL(nfs_set_verifier); 1191efeda80dSTrond Myklebust 1192efeda80dSTrond Myklebust #if IS_ENABLED(CONFIG_NFS_V4) 1193efeda80dSTrond Myklebust /** 1194efeda80dSTrond Myklebust * nfs_clear_verifier_delegated - clear the dir verifier delegation tag 1195efeda80dSTrond Myklebust * @inode: pointer to inode 1196efeda80dSTrond Myklebust * 1197efeda80dSTrond Myklebust * Iterates through the dentries in the inode alias list and clears 1198efeda80dSTrond Myklebust * the tag used to indicate that the dentry has been revalidated 1199efeda80dSTrond Myklebust * while holding a delegation. 1200efeda80dSTrond Myklebust * This function is intended for use when the delegation is being 1201efeda80dSTrond Myklebust * returned or revoked. 1202efeda80dSTrond Myklebust */ 1203efeda80dSTrond Myklebust void nfs_clear_verifier_delegated(struct inode *inode) 1204efeda80dSTrond Myklebust { 1205efeda80dSTrond Myklebust struct dentry *alias; 1206efeda80dSTrond Myklebust 1207efeda80dSTrond Myklebust if (!inode) 1208efeda80dSTrond Myklebust return; 1209efeda80dSTrond Myklebust spin_lock(&inode->i_lock); 1210efeda80dSTrond Myklebust hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) { 1211efeda80dSTrond Myklebust spin_lock(&alias->d_lock); 1212efeda80dSTrond Myklebust nfs_unset_verifier_delegated(&alias->d_time); 1213efeda80dSTrond Myklebust spin_unlock(&alias->d_lock); 1214efeda80dSTrond Myklebust } 1215efeda80dSTrond Myklebust spin_unlock(&inode->i_lock); 1216efeda80dSTrond Myklebust } 1217efeda80dSTrond Myklebust EXPORT_SYMBOL_GPL(nfs_clear_verifier_delegated); 1218efeda80dSTrond Myklebust #endif /* IS_ENABLED(CONFIG_NFS_V4) */ 1219efeda80dSTrond Myklebust 12201da177e4SLinus Torvalds /* 12211da177e4SLinus Torvalds * A check for whether or not the parent directory has changed. 12221da177e4SLinus Torvalds * In the case it has, we assume that the dentries are untrustworthy 12231da177e4SLinus Torvalds * and may need to be looked up again. 1224912a108dSNeilBrown * If rcu_walk prevents us from performing a full check, return 0. 12251da177e4SLinus Torvalds */ 1226912a108dSNeilBrown static int nfs_check_verifier(struct inode *dir, struct dentry *dentry, 1227912a108dSNeilBrown int rcu_walk) 12281da177e4SLinus Torvalds { 12291da177e4SLinus Torvalds if (IS_ROOT(dentry)) 12301da177e4SLinus Torvalds return 1; 12314eec952eSTrond Myklebust if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 12324eec952eSTrond Myklebust return 0; 1233f2c77f4eSTrond Myklebust if (!nfs_verify_change_attribute(dir, dentry->d_time)) 12346ecc5e8fSTrond Myklebust return 0; 1235f2c77f4eSTrond Myklebust /* Revalidate nfsi->cache_change_attribute before we declare a match */ 12361cd9cb05STrond Myklebust if (nfs_mapping_need_revalidate_inode(dir)) { 1237912a108dSNeilBrown if (rcu_walk) 1238f2c77f4eSTrond Myklebust return 0; 12391cd9cb05STrond Myklebust if (__nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) 12401cd9cb05STrond Myklebust return 0; 12411cd9cb05STrond Myklebust } 1242f2c77f4eSTrond Myklebust if (!nfs_verify_change_attribute(dir, dentry->d_time)) 1243f2c77f4eSTrond Myklebust return 0; 1244f2c77f4eSTrond Myklebust return 1; 12451da177e4SLinus Torvalds } 12461da177e4SLinus Torvalds 12471da177e4SLinus Torvalds /* 1248a12802caSTrond Myklebust * Use intent information to check whether or not we're going to do 1249a12802caSTrond Myklebust * an O_EXCL create using this path component. 1250a12802caSTrond Myklebust */ 1251fa3c56bbSAl Viro static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) 1252a12802caSTrond Myklebust { 1253a12802caSTrond Myklebust if (NFS_PROTO(dir)->version == 2) 1254a12802caSTrond Myklebust return 0; 1255fa3c56bbSAl Viro return flags & LOOKUP_EXCL; 1256a12802caSTrond Myklebust } 1257a12802caSTrond Myklebust 1258a12802caSTrond Myklebust /* 12591d6757fbSTrond Myklebust * Inode and filehandle revalidation for lookups. 12601d6757fbSTrond Myklebust * 12611d6757fbSTrond Myklebust * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, 12621d6757fbSTrond Myklebust * or if the intent information indicates that we're about to open this 12631d6757fbSTrond Myklebust * particular file and the "nocto" mount flag is not set. 12641d6757fbSTrond Myklebust * 12651d6757fbSTrond Myklebust */ 126665a0c149STrond Myklebust static 1267fa3c56bbSAl Viro int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) 12681da177e4SLinus Torvalds { 12691da177e4SLinus Torvalds struct nfs_server *server = NFS_SERVER(inode); 127065a0c149STrond Myklebust int ret; 12711da177e4SLinus Torvalds 127236d43a43SDavid Howells if (IS_AUTOMOUNT(inode)) 12734e99a1ffSTrond Myklebust return 0; 127447921921STrond Myklebust 127547921921STrond Myklebust if (flags & LOOKUP_OPEN) { 127647921921STrond Myklebust switch (inode->i_mode & S_IFMT) { 127747921921STrond Myklebust case S_IFREG: 127847921921STrond Myklebust /* A NFSv4 OPEN will revalidate later */ 127947921921STrond Myklebust if (server->caps & NFS_CAP_ATOMIC_OPEN) 128047921921STrond Myklebust goto out; 1281df561f66SGustavo A. R. Silva fallthrough; 128247921921STrond Myklebust case S_IFDIR: 128347921921STrond Myklebust if (server->flags & NFS_MOUNT_NOCTO) 128447921921STrond Myklebust break; 128547921921STrond Myklebust /* NFS close-to-open cache consistency validation */ 128647921921STrond Myklebust goto out_force; 128747921921STrond Myklebust } 128847921921STrond Myklebust } 128947921921STrond Myklebust 12901da177e4SLinus Torvalds /* VFS wants an on-the-wire revalidation */ 1291fa3c56bbSAl Viro if (flags & LOOKUP_REVAL) 12921da177e4SLinus Torvalds goto out_force; 129365a0c149STrond Myklebust out: 1294a61246c9SLance Shelton return (inode->i_nlink == 0) ? -ESTALE : 0; 12951da177e4SLinus Torvalds out_force: 12961fa1e384SNeilBrown if (flags & LOOKUP_RCU) 12971fa1e384SNeilBrown return -ECHILD; 129865a0c149STrond Myklebust ret = __nfs_revalidate_inode(server, inode); 129965a0c149STrond Myklebust if (ret != 0) 130065a0c149STrond Myklebust return ret; 130165a0c149STrond Myklebust goto out; 13021da177e4SLinus Torvalds } 13031da177e4SLinus Torvalds 13041da177e4SLinus Torvalds /* 13051da177e4SLinus Torvalds * We judge how long we want to trust negative 13061da177e4SLinus Torvalds * dentries by looking at the parent inode mtime. 13071da177e4SLinus Torvalds * 13081da177e4SLinus Torvalds * If parent mtime has changed, we revalidate, else we wait for a 13091da177e4SLinus Torvalds * period corresponding to the parent's attribute cache timeout value. 1310912a108dSNeilBrown * 1311912a108dSNeilBrown * If LOOKUP_RCU prevents us from performing a full check, return 1 1312912a108dSNeilBrown * suggesting a reval is needed. 13139f6d44d4STrond Myklebust * 13149f6d44d4STrond Myklebust * Note that when creating a new file, or looking up a rename target, 13159f6d44d4STrond Myklebust * then it shouldn't be necessary to revalidate a negative dentry. 13161da177e4SLinus Torvalds */ 13171da177e4SLinus Torvalds static inline 13181da177e4SLinus Torvalds int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, 1319fa3c56bbSAl Viro unsigned int flags) 13201da177e4SLinus Torvalds { 13219f6d44d4STrond Myklebust if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) 13221da177e4SLinus Torvalds return 0; 13234eec952eSTrond Myklebust if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) 13244eec952eSTrond Myklebust return 1; 1325912a108dSNeilBrown return !nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU); 13261da177e4SLinus Torvalds } 13271da177e4SLinus Torvalds 13285ceb9d7fSTrond Myklebust static int 13295ceb9d7fSTrond Myklebust nfs_lookup_revalidate_done(struct inode *dir, struct dentry *dentry, 13305ceb9d7fSTrond Myklebust struct inode *inode, int error) 13311da177e4SLinus Torvalds { 13325ceb9d7fSTrond Myklebust switch (error) { 13335ceb9d7fSTrond Myklebust case 1: 13346de1472fSAl Viro dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is valid\n", 13356de1472fSAl Viro __func__, dentry); 13361da177e4SLinus Torvalds return 1; 13375ceb9d7fSTrond Myklebust case 0: 1338a1643a92STrond Myklebust nfs_mark_for_revalidate(dir); 13391da177e4SLinus Torvalds if (inode && S_ISDIR(inode->i_mode)) { 13401da177e4SLinus Torvalds /* Purge readdir caches. */ 13411da177e4SLinus Torvalds nfs_zap_caches(inode); 1342a3f432bfSJ. Bruce Fields /* 1343a3f432bfSJ. Bruce Fields * We can't d_drop the root of a disconnected tree: 1344a3f432bfSJ. Bruce Fields * its d_hash is on the s_anon list and d_drop() would hide 1345a3f432bfSJ. Bruce Fields * it from shrink_dcache_for_unmount(), leading to busy 1346a3f432bfSJ. Bruce Fields * inodes on unmount and further oopses. 1347a3f432bfSJ. Bruce Fields */ 1348a3f432bfSJ. Bruce Fields if (IS_ROOT(dentry)) 13495ceb9d7fSTrond Myklebust return 1; 13501da177e4SLinus Torvalds } 13516de1472fSAl Viro dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is invalid\n", 13526de1472fSAl Viro __func__, dentry); 13531da177e4SLinus Torvalds return 0; 13545ceb9d7fSTrond Myklebust } 13556de1472fSAl Viro dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) lookup returned error %d\n", 13566de1472fSAl Viro __func__, dentry, error); 1357e1fb4d05STrond Myklebust return error; 13581da177e4SLinus Torvalds } 13591da177e4SLinus Torvalds 13605ceb9d7fSTrond Myklebust static int 13615ceb9d7fSTrond Myklebust nfs_lookup_revalidate_negative(struct inode *dir, struct dentry *dentry, 13625ceb9d7fSTrond Myklebust unsigned int flags) 13635ceb9d7fSTrond Myklebust { 13645ceb9d7fSTrond Myklebust int ret = 1; 13655ceb9d7fSTrond Myklebust if (nfs_neg_need_reval(dir, dentry, flags)) { 13665ceb9d7fSTrond Myklebust if (flags & LOOKUP_RCU) 13675ceb9d7fSTrond Myklebust return -ECHILD; 13685ceb9d7fSTrond Myklebust ret = 0; 13695ceb9d7fSTrond Myklebust } 13705ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, NULL, ret); 13715ceb9d7fSTrond Myklebust } 13725ceb9d7fSTrond Myklebust 13735ceb9d7fSTrond Myklebust static int 13745ceb9d7fSTrond Myklebust nfs_lookup_revalidate_delegated(struct inode *dir, struct dentry *dentry, 13755ceb9d7fSTrond Myklebust struct inode *inode) 13765ceb9d7fSTrond Myklebust { 13775ceb9d7fSTrond Myklebust nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 13785ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, inode, 1); 13795ceb9d7fSTrond Myklebust } 13805ceb9d7fSTrond Myklebust 13815ceb9d7fSTrond Myklebust static int 13825ceb9d7fSTrond Myklebust nfs_lookup_revalidate_dentry(struct inode *dir, struct dentry *dentry, 13835ceb9d7fSTrond Myklebust struct inode *inode) 13845ceb9d7fSTrond Myklebust { 13855ceb9d7fSTrond Myklebust struct nfs_fh *fhandle; 13865ceb9d7fSTrond Myklebust struct nfs_fattr *fattr; 13875ceb9d7fSTrond Myklebust struct nfs4_label *label; 1388a1147b82STrond Myklebust unsigned long dir_verifier; 13895ceb9d7fSTrond Myklebust int ret; 13905ceb9d7fSTrond Myklebust 13915ceb9d7fSTrond Myklebust ret = -ENOMEM; 13925ceb9d7fSTrond Myklebust fhandle = nfs_alloc_fhandle(); 13935ceb9d7fSTrond Myklebust fattr = nfs_alloc_fattr(); 13945ceb9d7fSTrond Myklebust label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 13955ceb9d7fSTrond Myklebust if (fhandle == NULL || fattr == NULL || IS_ERR(label)) 13965ceb9d7fSTrond Myklebust goto out; 13975ceb9d7fSTrond Myklebust 1398a1147b82STrond Myklebust dir_verifier = nfs_save_change_attribute(dir); 1399f7b37b8bSTrond Myklebust ret = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr, label); 14005ceb9d7fSTrond Myklebust if (ret < 0) { 1401f7b37b8bSTrond Myklebust switch (ret) { 1402f7b37b8bSTrond Myklebust case -ESTALE: 1403f7b37b8bSTrond Myklebust case -ENOENT: 14045ceb9d7fSTrond Myklebust ret = 0; 1405f7b37b8bSTrond Myklebust break; 1406f7b37b8bSTrond Myklebust case -ETIMEDOUT: 1407f7b37b8bSTrond Myklebust if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 1408f7b37b8bSTrond Myklebust ret = 1; 1409f7b37b8bSTrond Myklebust } 14105ceb9d7fSTrond Myklebust goto out; 14115ceb9d7fSTrond Myklebust } 14125ceb9d7fSTrond Myklebust ret = 0; 14135ceb9d7fSTrond Myklebust if (nfs_compare_fh(NFS_FH(inode), fhandle)) 14145ceb9d7fSTrond Myklebust goto out; 14155ceb9d7fSTrond Myklebust if (nfs_refresh_inode(inode, fattr) < 0) 14165ceb9d7fSTrond Myklebust goto out; 14175ceb9d7fSTrond Myklebust 14185ceb9d7fSTrond Myklebust nfs_setsecurity(inode, fattr, label); 1419a1147b82STrond Myklebust nfs_set_verifier(dentry, dir_verifier); 14205ceb9d7fSTrond Myklebust 14215ceb9d7fSTrond Myklebust /* set a readdirplus hint that we had a cache miss */ 14225ceb9d7fSTrond Myklebust nfs_force_use_readdirplus(dir); 14235ceb9d7fSTrond Myklebust ret = 1; 14245ceb9d7fSTrond Myklebust out: 14255ceb9d7fSTrond Myklebust nfs_free_fattr(fattr); 14265ceb9d7fSTrond Myklebust nfs_free_fhandle(fhandle); 14275ceb9d7fSTrond Myklebust nfs4_label_free(label); 14285ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, inode, ret); 14295ceb9d7fSTrond Myklebust } 14305ceb9d7fSTrond Myklebust 14315ceb9d7fSTrond Myklebust /* 14325ceb9d7fSTrond Myklebust * This is called every time the dcache has a lookup hit, 14335ceb9d7fSTrond Myklebust * and we should check whether we can really trust that 14345ceb9d7fSTrond Myklebust * lookup. 14355ceb9d7fSTrond Myklebust * 14365ceb9d7fSTrond Myklebust * NOTE! The hit can be a negative hit too, don't assume 14375ceb9d7fSTrond Myklebust * we have an inode! 14385ceb9d7fSTrond Myklebust * 14395ceb9d7fSTrond Myklebust * If the parent directory is seen to have changed, we throw out the 14405ceb9d7fSTrond Myklebust * cached dentry and do a new lookup. 14415ceb9d7fSTrond Myklebust */ 14425ceb9d7fSTrond Myklebust static int 14435ceb9d7fSTrond Myklebust nfs_do_lookup_revalidate(struct inode *dir, struct dentry *dentry, 14445ceb9d7fSTrond Myklebust unsigned int flags) 14455ceb9d7fSTrond Myklebust { 14465ceb9d7fSTrond Myklebust struct inode *inode; 14475ceb9d7fSTrond Myklebust int error; 14485ceb9d7fSTrond Myklebust 14495ceb9d7fSTrond Myklebust nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); 14505ceb9d7fSTrond Myklebust inode = d_inode(dentry); 14515ceb9d7fSTrond Myklebust 14525ceb9d7fSTrond Myklebust if (!inode) 14535ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_negative(dir, dentry, flags); 14545ceb9d7fSTrond Myklebust 14555ceb9d7fSTrond Myklebust if (is_bad_inode(inode)) { 14565ceb9d7fSTrond Myklebust dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", 14575ceb9d7fSTrond Myklebust __func__, dentry); 14585ceb9d7fSTrond Myklebust goto out_bad; 14595ceb9d7fSTrond Myklebust } 14605ceb9d7fSTrond Myklebust 1461efeda80dSTrond Myklebust if (nfs_verifier_is_delegated(dentry)) 14625ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_delegated(dir, dentry, inode); 14635ceb9d7fSTrond Myklebust 14645ceb9d7fSTrond Myklebust /* Force a full look up iff the parent directory has changed */ 14655ceb9d7fSTrond Myklebust if (!(flags & (LOOKUP_EXCL | LOOKUP_REVAL)) && 14665ceb9d7fSTrond Myklebust nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) { 14675ceb9d7fSTrond Myklebust error = nfs_lookup_verify_inode(inode, flags); 14685ceb9d7fSTrond Myklebust if (error) { 14695ceb9d7fSTrond Myklebust if (error == -ESTALE) 14705ceb9d7fSTrond Myklebust nfs_zap_caches(dir); 14715ceb9d7fSTrond Myklebust goto out_bad; 14725ceb9d7fSTrond Myklebust } 14735ceb9d7fSTrond Myklebust nfs_advise_use_readdirplus(dir); 14745ceb9d7fSTrond Myklebust goto out_valid; 14755ceb9d7fSTrond Myklebust } 14765ceb9d7fSTrond Myklebust 14775ceb9d7fSTrond Myklebust if (flags & LOOKUP_RCU) 14785ceb9d7fSTrond Myklebust return -ECHILD; 14795ceb9d7fSTrond Myklebust 14805ceb9d7fSTrond Myklebust if (NFS_STALE(inode)) 14815ceb9d7fSTrond Myklebust goto out_bad; 14825ceb9d7fSTrond Myklebust 14835ceb9d7fSTrond Myklebust trace_nfs_lookup_revalidate_enter(dir, dentry, flags); 14845ceb9d7fSTrond Myklebust error = nfs_lookup_revalidate_dentry(dir, dentry, inode); 14855ceb9d7fSTrond Myklebust trace_nfs_lookup_revalidate_exit(dir, dentry, flags, error); 14865ceb9d7fSTrond Myklebust return error; 14875ceb9d7fSTrond Myklebust out_valid: 14885ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, inode, 1); 14895ceb9d7fSTrond Myklebust out_bad: 14905ceb9d7fSTrond Myklebust if (flags & LOOKUP_RCU) 14915ceb9d7fSTrond Myklebust return -ECHILD; 14925ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, inode, 0); 14935ceb9d7fSTrond Myklebust } 14945ceb9d7fSTrond Myklebust 14955ceb9d7fSTrond Myklebust static int 1496c7944ebbSTrond Myklebust __nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags, 1497c7944ebbSTrond Myklebust int (*reval)(struct inode *, struct dentry *, unsigned int)) 14985ceb9d7fSTrond Myklebust { 14995ceb9d7fSTrond Myklebust struct dentry *parent; 15005ceb9d7fSTrond Myklebust struct inode *dir; 15015ceb9d7fSTrond Myklebust int ret; 15025ceb9d7fSTrond Myklebust 15035ceb9d7fSTrond Myklebust if (flags & LOOKUP_RCU) { 15045ceb9d7fSTrond Myklebust parent = READ_ONCE(dentry->d_parent); 15055ceb9d7fSTrond Myklebust dir = d_inode_rcu(parent); 15065ceb9d7fSTrond Myklebust if (!dir) 15075ceb9d7fSTrond Myklebust return -ECHILD; 1508c7944ebbSTrond Myklebust ret = reval(dir, dentry, flags); 15095ceb9d7fSTrond Myklebust if (parent != READ_ONCE(dentry->d_parent)) 15105ceb9d7fSTrond Myklebust return -ECHILD; 15115ceb9d7fSTrond Myklebust } else { 15125ceb9d7fSTrond Myklebust parent = dget_parent(dentry); 1513c7944ebbSTrond Myklebust ret = reval(d_inode(parent), dentry, flags); 15145ceb9d7fSTrond Myklebust dput(parent); 15155ceb9d7fSTrond Myklebust } 15165ceb9d7fSTrond Myklebust return ret; 15175ceb9d7fSTrond Myklebust } 15185ceb9d7fSTrond Myklebust 1519c7944ebbSTrond Myklebust static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) 1520c7944ebbSTrond Myklebust { 1521c7944ebbSTrond Myklebust return __nfs_lookup_revalidate(dentry, flags, nfs_do_lookup_revalidate); 1522c7944ebbSTrond Myklebust } 1523c7944ebbSTrond Myklebust 15241da177e4SLinus Torvalds /* 15252b0143b5SDavid Howells * A weaker form of d_revalidate for revalidating just the d_inode(dentry) 1526ecf3d1f1SJeff Layton * when we don't really care about the dentry name. This is called when a 1527ecf3d1f1SJeff Layton * pathwalk ends on a dentry that was not found via a normal lookup in the 1528ecf3d1f1SJeff Layton * parent dir (e.g.: ".", "..", procfs symlinks or mountpoint traversals). 1529ecf3d1f1SJeff Layton * 1530ecf3d1f1SJeff Layton * In this situation, we just want to verify that the inode itself is OK 1531ecf3d1f1SJeff Layton * since the dentry might have changed on the server. 1532ecf3d1f1SJeff Layton */ 1533ecf3d1f1SJeff Layton static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags) 1534ecf3d1f1SJeff Layton { 15352b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 15369cdd1d3fSTrond Myklebust int error = 0; 1537ecf3d1f1SJeff Layton 1538ecf3d1f1SJeff Layton /* 1539ecf3d1f1SJeff Layton * I believe we can only get a negative dentry here in the case of a 1540ecf3d1f1SJeff Layton * procfs-style symlink. Just assume it's correct for now, but we may 1541ecf3d1f1SJeff Layton * eventually need to do something more here. 1542ecf3d1f1SJeff Layton */ 1543ecf3d1f1SJeff Layton if (!inode) { 15446de1472fSAl Viro dfprintk(LOOKUPCACHE, "%s: %pd2 has negative inode\n", 15456de1472fSAl Viro __func__, dentry); 1546ecf3d1f1SJeff Layton return 1; 1547ecf3d1f1SJeff Layton } 1548ecf3d1f1SJeff Layton 1549ecf3d1f1SJeff Layton if (is_bad_inode(inode)) { 15506de1472fSAl Viro dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", 15516de1472fSAl Viro __func__, dentry); 1552ecf3d1f1SJeff Layton return 0; 1553ecf3d1f1SJeff Layton } 1554ecf3d1f1SJeff Layton 1555b688741cSNeilBrown error = nfs_lookup_verify_inode(inode, flags); 1556ecf3d1f1SJeff Layton dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n", 1557ecf3d1f1SJeff Layton __func__, inode->i_ino, error ? "invalid" : "valid"); 1558ecf3d1f1SJeff Layton return !error; 1559ecf3d1f1SJeff Layton } 1560ecf3d1f1SJeff Layton 1561ecf3d1f1SJeff Layton /* 15621da177e4SLinus Torvalds * This is called from dput() when d_count is going to 0. 15631da177e4SLinus Torvalds */ 1564fe15ce44SNick Piggin static int nfs_dentry_delete(const struct dentry *dentry) 15651da177e4SLinus Torvalds { 15666de1472fSAl Viro dfprintk(VFS, "NFS: dentry_delete(%pd2, %x)\n", 15676de1472fSAl Viro dentry, dentry->d_flags); 15681da177e4SLinus Torvalds 156977f11192STrond Myklebust /* Unhash any dentry with a stale inode */ 15702b0143b5SDavid Howells if (d_really_is_positive(dentry) && NFS_STALE(d_inode(dentry))) 157177f11192STrond Myklebust return 1; 157277f11192STrond Myklebust 15731da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { 15741da177e4SLinus Torvalds /* Unhash it, so that ->d_iput() would be called */ 15751da177e4SLinus Torvalds return 1; 15761da177e4SLinus Torvalds } 15771751e8a6SLinus Torvalds if (!(dentry->d_sb->s_flags & SB_ACTIVE)) { 15781da177e4SLinus Torvalds /* Unhash it, so that ancestors of killed async unlink 15791da177e4SLinus Torvalds * files will be cleaned up during umount */ 15801da177e4SLinus Torvalds return 1; 15811da177e4SLinus Torvalds } 15821da177e4SLinus Torvalds return 0; 15831da177e4SLinus Torvalds 15841da177e4SLinus Torvalds } 15851da177e4SLinus Torvalds 15861f018458STrond Myklebust /* Ensure that we revalidate inode->i_nlink */ 15871b83d707STrond Myklebust static void nfs_drop_nlink(struct inode *inode) 15881b83d707STrond Myklebust { 15891b83d707STrond Myklebust spin_lock(&inode->i_lock); 15901f018458STrond Myklebust /* drop the inode if we're reasonably sure this is the last link */ 159159a707b0STrond Myklebust if (inode->i_nlink > 0) 159259a707b0STrond Myklebust drop_nlink(inode); 159359a707b0STrond Myklebust NFS_I(inode)->attr_gencount = nfs_inc_attr_generation_counter(); 159416e14375STrond Myklebust NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE 159516e14375STrond Myklebust | NFS_INO_INVALID_CTIME 159659a707b0STrond Myklebust | NFS_INO_INVALID_OTHER 159759a707b0STrond Myklebust | NFS_INO_REVAL_FORCED; 15981b83d707STrond Myklebust spin_unlock(&inode->i_lock); 15991b83d707STrond Myklebust } 16001b83d707STrond Myklebust 16011da177e4SLinus Torvalds /* 16021da177e4SLinus Torvalds * Called when the dentry loses inode. 16031da177e4SLinus Torvalds * We use it to clean up silly-renamed files. 16041da177e4SLinus Torvalds */ 16051da177e4SLinus Torvalds static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) 16061da177e4SLinus Torvalds { 160783672d39SNeil Brown if (S_ISDIR(inode->i_mode)) 160883672d39SNeil Brown /* drop any readdir cache as it could easily be old */ 160983672d39SNeil Brown NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; 161083672d39SNeil Brown 16111da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { 1612e4eff1a6STrond Myklebust nfs_complete_unlink(dentry, inode); 16131f018458STrond Myklebust nfs_drop_nlink(inode); 16141da177e4SLinus Torvalds } 16151da177e4SLinus Torvalds iput(inode); 16161da177e4SLinus Torvalds } 16171da177e4SLinus Torvalds 1618b1942c5fSAl Viro static void nfs_d_release(struct dentry *dentry) 1619b1942c5fSAl Viro { 1620b1942c5fSAl Viro /* free cached devname value, if it survived that far */ 1621b1942c5fSAl Viro if (unlikely(dentry->d_fsdata)) { 1622b1942c5fSAl Viro if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 1623b1942c5fSAl Viro WARN_ON(1); 1624b1942c5fSAl Viro else 1625b1942c5fSAl Viro kfree(dentry->d_fsdata); 1626b1942c5fSAl Viro } 1627b1942c5fSAl Viro } 1628b1942c5fSAl Viro 1629f786aa90SAl Viro const struct dentry_operations nfs_dentry_operations = { 16301da177e4SLinus Torvalds .d_revalidate = nfs_lookup_revalidate, 1631ecf3d1f1SJeff Layton .d_weak_revalidate = nfs_weak_revalidate, 16321da177e4SLinus Torvalds .d_delete = nfs_dentry_delete, 16331da177e4SLinus Torvalds .d_iput = nfs_dentry_iput, 163436d43a43SDavid Howells .d_automount = nfs_d_automount, 1635b1942c5fSAl Viro .d_release = nfs_d_release, 16361da177e4SLinus Torvalds }; 1637ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_dentry_operations); 16381da177e4SLinus Torvalds 1639597d9289SBryan Schumaker struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) 16401da177e4SLinus Torvalds { 16411da177e4SLinus Torvalds struct dentry *res; 16421da177e4SLinus Torvalds struct inode *inode = NULL; 1643e1fb4d05STrond Myklebust struct nfs_fh *fhandle = NULL; 1644e1fb4d05STrond Myklebust struct nfs_fattr *fattr = NULL; 16451775fd3eSDavid Quigley struct nfs4_label *label = NULL; 1646a1147b82STrond Myklebust unsigned long dir_verifier; 16471da177e4SLinus Torvalds int error; 16481da177e4SLinus Torvalds 16496de1472fSAl Viro dfprintk(VFS, "NFS: lookup(%pd2)\n", dentry); 165091d5b470SChuck Lever nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); 16511da177e4SLinus Torvalds 1652130f9ab7SAl Viro if (unlikely(dentry->d_name.len > NFS_SERVER(dir)->namelen)) 1653130f9ab7SAl Viro return ERR_PTR(-ENAMETOOLONG); 16541da177e4SLinus Torvalds 1655fd684071STrond Myklebust /* 1656fd684071STrond Myklebust * If we're doing an exclusive create, optimize away the lookup 1657fd684071STrond Myklebust * but don't hash the dentry. 1658fd684071STrond Myklebust */ 16599f6d44d4STrond Myklebust if (nfs_is_exclusive_create(dir, flags) || flags & LOOKUP_RENAME_TARGET) 1660130f9ab7SAl Viro return NULL; 16611da177e4SLinus Torvalds 1662e1fb4d05STrond Myklebust res = ERR_PTR(-ENOMEM); 1663e1fb4d05STrond Myklebust fhandle = nfs_alloc_fhandle(); 1664e1fb4d05STrond Myklebust fattr = nfs_alloc_fattr(); 1665e1fb4d05STrond Myklebust if (fhandle == NULL || fattr == NULL) 1666e1fb4d05STrond Myklebust goto out; 1667e1fb4d05STrond Myklebust 166814c43f76SDavid Quigley label = nfs4_label_alloc(NFS_SERVER(dir), GFP_NOWAIT); 166914c43f76SDavid Quigley if (IS_ERR(label)) 167014c43f76SDavid Quigley goto out; 167114c43f76SDavid Quigley 1672a1147b82STrond Myklebust dir_verifier = nfs_save_change_attribute(dir); 16736e0d0be7STrond Myklebust trace_nfs_lookup_enter(dir, dentry, flags); 1674f7b37b8bSTrond Myklebust error = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr, label); 16751da177e4SLinus Torvalds if (error == -ENOENT) 16761da177e4SLinus Torvalds goto no_entry; 16771da177e4SLinus Torvalds if (error < 0) { 16781da177e4SLinus Torvalds res = ERR_PTR(error); 1679bf130914SAl Viro goto out_label; 16801da177e4SLinus Torvalds } 16811775fd3eSDavid Quigley inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); 1682bf0c84f1SNamhyung Kim res = ERR_CAST(inode); 168303f28e3aSTrond Myklebust if (IS_ERR(res)) 1684bf130914SAl Viro goto out_label; 168554ceac45SDavid Howells 168663519fbcSTrond Myklebust /* Notify readdir to use READDIRPLUS */ 168763519fbcSTrond Myklebust nfs_force_use_readdirplus(dir); 1688d69ee9b8STrond Myklebust 16891da177e4SLinus Torvalds no_entry: 169041d28bcaSAl Viro res = d_splice_alias(inode, dentry); 16919eaef27bSTrond Myklebust if (res != NULL) { 16929eaef27bSTrond Myklebust if (IS_ERR(res)) 1693bf130914SAl Viro goto out_label; 16941da177e4SLinus Torvalds dentry = res; 16959eaef27bSTrond Myklebust } 1696a1147b82STrond Myklebust nfs_set_verifier(dentry, dir_verifier); 1697bf130914SAl Viro out_label: 16986e0d0be7STrond Myklebust trace_nfs_lookup_exit(dir, dentry, flags, error); 169914c43f76SDavid Quigley nfs4_label_free(label); 17001da177e4SLinus Torvalds out: 1701e1fb4d05STrond Myklebust nfs_free_fattr(fattr); 1702e1fb4d05STrond Myklebust nfs_free_fhandle(fhandle); 17031da177e4SLinus Torvalds return res; 17041da177e4SLinus Torvalds } 1705ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_lookup); 17061da177e4SLinus Torvalds 170789d77c8fSBryan Schumaker #if IS_ENABLED(CONFIG_NFS_V4) 17080b728e19SAl Viro static int nfs4_lookup_revalidate(struct dentry *, unsigned int); 17091da177e4SLinus Torvalds 1710f786aa90SAl Viro const struct dentry_operations nfs4_dentry_operations = { 17110ef97dcfSMiklos Szeredi .d_revalidate = nfs4_lookup_revalidate, 1712b688741cSNeilBrown .d_weak_revalidate = nfs_weak_revalidate, 17131da177e4SLinus Torvalds .d_delete = nfs_dentry_delete, 17141da177e4SLinus Torvalds .d_iput = nfs_dentry_iput, 171536d43a43SDavid Howells .d_automount = nfs_d_automount, 1716b1942c5fSAl Viro .d_release = nfs_d_release, 17171da177e4SLinus Torvalds }; 171889d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs4_dentry_operations); 17191da177e4SLinus Torvalds 17208a5e929dSAl Viro static fmode_t flags_to_mode(int flags) 17218a5e929dSAl Viro { 17228a5e929dSAl Viro fmode_t res = (__force fmode_t)flags & FMODE_EXEC; 17238a5e929dSAl Viro if ((flags & O_ACCMODE) != O_WRONLY) 17248a5e929dSAl Viro res |= FMODE_READ; 17258a5e929dSAl Viro if ((flags & O_ACCMODE) != O_RDONLY) 17268a5e929dSAl Viro res |= FMODE_WRITE; 17278a5e929dSAl Viro return res; 17288a5e929dSAl Viro } 17298a5e929dSAl Viro 1730532d4defSNeilBrown static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags, struct file *filp) 1731cd9a1c0eSTrond Myklebust { 1732532d4defSNeilBrown return alloc_nfs_open_context(dentry, flags_to_mode(open_flags), filp); 1733cd9a1c0eSTrond Myklebust } 1734cd9a1c0eSTrond Myklebust 1735cd9a1c0eSTrond Myklebust static int do_open(struct inode *inode, struct file *filp) 1736cd9a1c0eSTrond Myklebust { 1737f1fe29b4SDavid Howells nfs_fscache_open_file(inode, filp); 1738cd9a1c0eSTrond Myklebust return 0; 1739cd9a1c0eSTrond Myklebust } 1740cd9a1c0eSTrond Myklebust 1741d9585277SAl Viro static int nfs_finish_open(struct nfs_open_context *ctx, 17420dd2b474SMiklos Szeredi struct dentry *dentry, 1743b452a458SAl Viro struct file *file, unsigned open_flags) 1744cd9a1c0eSTrond Myklebust { 17450dd2b474SMiklos Szeredi int err; 17460dd2b474SMiklos Szeredi 1747be12af3eSAl Viro err = finish_open(file, dentry, do_open); 174830d90494SAl Viro if (err) 1749d9585277SAl Viro goto out; 1750eaa2b82cSNeilBrown if (S_ISREG(file->f_path.dentry->d_inode->i_mode)) 175130d90494SAl Viro nfs_file_set_open_context(file, ctx); 1752eaa2b82cSNeilBrown else 17539821421aSTrond Myklebust err = -EOPENSTALE; 1754cd9a1c0eSTrond Myklebust out: 1755d9585277SAl Viro return err; 1756cd9a1c0eSTrond Myklebust } 1757cd9a1c0eSTrond Myklebust 175873a79706SBryan Schumaker int nfs_atomic_open(struct inode *dir, struct dentry *dentry, 175930d90494SAl Viro struct file *file, unsigned open_flags, 176044907d79SAl Viro umode_t mode) 17611da177e4SLinus Torvalds { 1762c94c0953SAl Viro DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); 1763cd9a1c0eSTrond Myklebust struct nfs_open_context *ctx; 17640dd2b474SMiklos Szeredi struct dentry *res; 17650dd2b474SMiklos Szeredi struct iattr attr = { .ia_valid = ATTR_OPEN }; 1766f46e0bd3STrond Myklebust struct inode *inode; 17671472b83eSTrond Myklebust unsigned int lookup_flags = 0; 1768c94c0953SAl Viro bool switched = false; 176973a09dd9SAl Viro int created = 0; 1770898f635cSTrond Myklebust int err; 17711da177e4SLinus Torvalds 17720dd2b474SMiklos Szeredi /* Expect a negative dentry */ 17732b0143b5SDavid Howells BUG_ON(d_inode(dentry)); 17740dd2b474SMiklos Szeredi 17751e8968c5SNiels de Vos dfprintk(VFS, "NFS: atomic_open(%s/%lu), %pd\n", 17766de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 17771e7cb3dcSChuck Lever 17789597c13bSJeff Layton err = nfs_check_flags(open_flags); 17799597c13bSJeff Layton if (err) 17809597c13bSJeff Layton return err; 17819597c13bSJeff Layton 17820dd2b474SMiklos Szeredi /* NFS only supports OPEN on regular files */ 17830dd2b474SMiklos Szeredi if ((open_flags & O_DIRECTORY)) { 178400699ad8SAl Viro if (!d_in_lookup(dentry)) { 17850dd2b474SMiklos Szeredi /* 17860dd2b474SMiklos Szeredi * Hashed negative dentry with O_DIRECTORY: dentry was 17870dd2b474SMiklos Szeredi * revalidated and is fine, no need to perform lookup 17880dd2b474SMiklos Szeredi * again 17890dd2b474SMiklos Szeredi */ 1790d9585277SAl Viro return -ENOENT; 17910dd2b474SMiklos Szeredi } 17921472b83eSTrond Myklebust lookup_flags = LOOKUP_OPEN|LOOKUP_DIRECTORY; 17931da177e4SLinus Torvalds goto no_open; 17941da177e4SLinus Torvalds } 17951da177e4SLinus Torvalds 17960dd2b474SMiklos Szeredi if (dentry->d_name.len > NFS_SERVER(dir)->namelen) 1797d9585277SAl Viro return -ENAMETOOLONG; 17981da177e4SLinus Torvalds 17990dd2b474SMiklos Szeredi if (open_flags & O_CREAT) { 1800dff25ddbSAndreas Gruenbacher struct nfs_server *server = NFS_SERVER(dir); 1801dff25ddbSAndreas Gruenbacher 1802dff25ddbSAndreas Gruenbacher if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 1803dff25ddbSAndreas Gruenbacher mode &= ~current_umask(); 1804dff25ddbSAndreas Gruenbacher 1805536e43d1STrond Myklebust attr.ia_valid |= ATTR_MODE; 1806dff25ddbSAndreas Gruenbacher attr.ia_mode = mode; 18070dd2b474SMiklos Szeredi } 1808536e43d1STrond Myklebust if (open_flags & O_TRUNC) { 1809536e43d1STrond Myklebust attr.ia_valid |= ATTR_SIZE; 1810536e43d1STrond Myklebust attr.ia_size = 0; 1811cd9a1c0eSTrond Myklebust } 1812cd9a1c0eSTrond Myklebust 1813c94c0953SAl Viro if (!(open_flags & O_CREAT) && !d_in_lookup(dentry)) { 1814c94c0953SAl Viro d_drop(dentry); 1815c94c0953SAl Viro switched = true; 1816c94c0953SAl Viro dentry = d_alloc_parallel(dentry->d_parent, 1817c94c0953SAl Viro &dentry->d_name, &wq); 1818c94c0953SAl Viro if (IS_ERR(dentry)) 1819c94c0953SAl Viro return PTR_ERR(dentry); 1820c94c0953SAl Viro if (unlikely(!d_in_lookup(dentry))) 1821c94c0953SAl Viro return finish_no_open(file, dentry); 1822c94c0953SAl Viro } 1823c94c0953SAl Viro 1824532d4defSNeilBrown ctx = create_nfs_open_context(dentry, open_flags, file); 18250dd2b474SMiklos Szeredi err = PTR_ERR(ctx); 18260dd2b474SMiklos Szeredi if (IS_ERR(ctx)) 1827d9585277SAl Viro goto out; 18280dd2b474SMiklos Szeredi 18296e0d0be7STrond Myklebust trace_nfs_atomic_open_enter(dir, ctx, open_flags); 183073a09dd9SAl Viro inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, &created); 183173a09dd9SAl Viro if (created) 183273a09dd9SAl Viro file->f_mode |= FMODE_CREATED; 1833275bb307STrond Myklebust if (IS_ERR(inode)) { 18340dd2b474SMiklos Szeredi err = PTR_ERR(inode); 18356e0d0be7STrond Myklebust trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); 18362d9db750STrond Myklebust put_nfs_open_context(ctx); 1837d20cb71dSAl Viro d_drop(dentry); 18380dd2b474SMiklos Szeredi switch (err) { 18391da177e4SLinus Torvalds case -ENOENT: 1840774d9513SPeng Tao d_splice_alias(NULL, dentry); 1841809fd143STrond Myklebust nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 18420dd2b474SMiklos Szeredi break; 18431788ea6eSJeff Layton case -EISDIR: 18446f926b5bSTrond Myklebust case -ENOTDIR: 18456f926b5bSTrond Myklebust goto no_open; 18461da177e4SLinus Torvalds case -ELOOP: 18470dd2b474SMiklos Szeredi if (!(open_flags & O_NOFOLLOW)) 18481da177e4SLinus Torvalds goto no_open; 18490dd2b474SMiklos Szeredi break; 18501da177e4SLinus Torvalds /* case -EINVAL: */ 18511da177e4SLinus Torvalds default: 18520dd2b474SMiklos Szeredi break; 18531da177e4SLinus Torvalds } 18541da177e4SLinus Torvalds goto out; 18551da177e4SLinus Torvalds } 18560dd2b474SMiklos Szeredi 1857b452a458SAl Viro err = nfs_finish_open(ctx, ctx->dentry, file, open_flags); 18586e0d0be7STrond Myklebust trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); 18592d9db750STrond Myklebust put_nfs_open_context(ctx); 1860d9585277SAl Viro out: 1861c94c0953SAl Viro if (unlikely(switched)) { 1862c94c0953SAl Viro d_lookup_done(dentry); 1863c94c0953SAl Viro dput(dentry); 1864c94c0953SAl Viro } 1865d9585277SAl Viro return err; 18660dd2b474SMiklos Szeredi 18671da177e4SLinus Torvalds no_open: 18681472b83eSTrond Myklebust res = nfs_lookup(dir, dentry, lookup_flags); 1869c94c0953SAl Viro if (switched) { 1870c94c0953SAl Viro d_lookup_done(dentry); 1871c94c0953SAl Viro if (!res) 1872c94c0953SAl Viro res = dentry; 1873c94c0953SAl Viro else 1874c94c0953SAl Viro dput(dentry); 1875c94c0953SAl Viro } 18760dd2b474SMiklos Szeredi if (IS_ERR(res)) 1877c94c0953SAl Viro return PTR_ERR(res); 1878e45198a6SAl Viro return finish_no_open(file, res); 18791da177e4SLinus Torvalds } 188089d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_atomic_open); 18811da177e4SLinus Torvalds 1882c7944ebbSTrond Myklebust static int 1883c7944ebbSTrond Myklebust nfs4_do_lookup_revalidate(struct inode *dir, struct dentry *dentry, 1884c7944ebbSTrond Myklebust unsigned int flags) 18851da177e4SLinus Torvalds { 1886657e94b6SNick Piggin struct inode *inode; 18871da177e4SLinus Torvalds 1888fa3c56bbSAl Viro if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) 1889c7944ebbSTrond Myklebust goto full_reval; 1890eda72afbSMiklos Szeredi if (d_mountpoint(dentry)) 1891c7944ebbSTrond Myklebust goto full_reval; 18922b484297STrond Myklebust 18932b0143b5SDavid Howells inode = d_inode(dentry); 18942b484297STrond Myklebust 18951da177e4SLinus Torvalds /* We can't create new files in nfs_open_revalidate(), so we 18961da177e4SLinus Torvalds * optimize away revalidation of negative dentries. 18971da177e4SLinus Torvalds */ 1898c7944ebbSTrond Myklebust if (inode == NULL) 1899c7944ebbSTrond Myklebust goto full_reval; 190049317a7fSNeilBrown 1901efeda80dSTrond Myklebust if (nfs_verifier_is_delegated(dentry)) 1902c7944ebbSTrond Myklebust return nfs_lookup_revalidate_delegated(dir, dentry, inode); 1903216d5d06STrond Myklebust 19041da177e4SLinus Torvalds /* NFS only supports OPEN on regular files */ 19051da177e4SLinus Torvalds if (!S_ISREG(inode->i_mode)) 1906c7944ebbSTrond Myklebust goto full_reval; 1907c7944ebbSTrond Myklebust 19081da177e4SLinus Torvalds /* We cannot do exclusive creation on a positive dentry */ 1909c7944ebbSTrond Myklebust if (flags & (LOOKUP_EXCL | LOOKUP_REVAL)) 1910c7944ebbSTrond Myklebust goto reval_dentry; 1911c7944ebbSTrond Myklebust 1912c7944ebbSTrond Myklebust /* Check if the directory changed */ 1913c7944ebbSTrond Myklebust if (!nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) 1914c7944ebbSTrond Myklebust goto reval_dentry; 19151da177e4SLinus Torvalds 19160ef97dcfSMiklos Szeredi /* Let f_op->open() actually open (and revalidate) the file */ 1917c7944ebbSTrond Myklebust return 1; 1918c7944ebbSTrond Myklebust reval_dentry: 1919c7944ebbSTrond Myklebust if (flags & LOOKUP_RCU) 1920c7944ebbSTrond Myklebust return -ECHILD; 192142f72cf3Szhangliguang return nfs_lookup_revalidate_dentry(dir, dentry, inode); 19220ef97dcfSMiklos Szeredi 1923c7944ebbSTrond Myklebust full_reval: 1924c7944ebbSTrond Myklebust return nfs_do_lookup_revalidate(dir, dentry, flags); 1925c7944ebbSTrond Myklebust } 1926535918f1STrond Myklebust 1927c7944ebbSTrond Myklebust static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) 1928c7944ebbSTrond Myklebust { 1929c7944ebbSTrond Myklebust return __nfs_lookup_revalidate(dentry, flags, 1930c7944ebbSTrond Myklebust nfs4_do_lookup_revalidate); 1931c0204fd2STrond Myklebust } 1932c0204fd2STrond Myklebust 19331da177e4SLinus Torvalds #endif /* CONFIG_NFSV4 */ 19341da177e4SLinus Torvalds 1935406cd915SBenjamin Coddington struct dentry * 1936406cd915SBenjamin Coddington nfs_add_or_obtain(struct dentry *dentry, struct nfs_fh *fhandle, 19371775fd3eSDavid Quigley struct nfs_fattr *fattr, 19381775fd3eSDavid Quigley struct nfs4_label *label) 19391da177e4SLinus Torvalds { 1940fab728e1STrond Myklebust struct dentry *parent = dget_parent(dentry); 19412b0143b5SDavid Howells struct inode *dir = d_inode(parent); 19421da177e4SLinus Torvalds struct inode *inode; 1943b0c6108eSAl Viro struct dentry *d; 1944406cd915SBenjamin Coddington int error; 19451da177e4SLinus Torvalds 1946fab728e1STrond Myklebust d_drop(dentry); 1947fab728e1STrond Myklebust 19481da177e4SLinus Torvalds if (fhandle->size == 0) { 1949f7b37b8bSTrond Myklebust error = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr, NULL); 19501da177e4SLinus Torvalds if (error) 1951fab728e1STrond Myklebust goto out_error; 19521da177e4SLinus Torvalds } 19535724ab37STrond Myklebust nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 19541da177e4SLinus Torvalds if (!(fattr->valid & NFS_ATTR_FATTR)) { 19551da177e4SLinus Torvalds struct nfs_server *server = NFS_SB(dentry->d_sb); 1956a841b54dSTrond Myklebust error = server->nfs_client->rpc_ops->getattr(server, fhandle, 1957a841b54dSTrond Myklebust fattr, NULL, NULL); 19581da177e4SLinus Torvalds if (error < 0) 1959fab728e1STrond Myklebust goto out_error; 19601da177e4SLinus Torvalds } 19611775fd3eSDavid Quigley inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); 1962b0c6108eSAl Viro d = d_splice_alias(inode, dentry); 1963fab728e1STrond Myklebust out: 1964fab728e1STrond Myklebust dput(parent); 1965406cd915SBenjamin Coddington return d; 1966fab728e1STrond Myklebust out_error: 1967fab728e1STrond Myklebust nfs_mark_for_revalidate(dir); 1968406cd915SBenjamin Coddington d = ERR_PTR(error); 1969406cd915SBenjamin Coddington goto out; 1970406cd915SBenjamin Coddington } 1971406cd915SBenjamin Coddington EXPORT_SYMBOL_GPL(nfs_add_or_obtain); 1972406cd915SBenjamin Coddington 1973406cd915SBenjamin Coddington /* 1974406cd915SBenjamin Coddington * Code common to create, mkdir, and mknod. 1975406cd915SBenjamin Coddington */ 1976406cd915SBenjamin Coddington int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, 1977406cd915SBenjamin Coddington struct nfs_fattr *fattr, 1978406cd915SBenjamin Coddington struct nfs4_label *label) 1979406cd915SBenjamin Coddington { 1980406cd915SBenjamin Coddington struct dentry *d; 1981406cd915SBenjamin Coddington 1982406cd915SBenjamin Coddington d = nfs_add_or_obtain(dentry, fhandle, fattr, label); 1983406cd915SBenjamin Coddington if (IS_ERR(d)) 1984406cd915SBenjamin Coddington return PTR_ERR(d); 1985406cd915SBenjamin Coddington 1986406cd915SBenjamin Coddington /* Callers don't care */ 1987406cd915SBenjamin Coddington dput(d); 1988406cd915SBenjamin Coddington return 0; 19891da177e4SLinus Torvalds } 1990ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_instantiate); 19911da177e4SLinus Torvalds 19921da177e4SLinus Torvalds /* 19931da177e4SLinus Torvalds * Following a failed create operation, we drop the dentry rather 19941da177e4SLinus Torvalds * than retain a negative dentry. This avoids a problem in the event 19951da177e4SLinus Torvalds * that the operation succeeded on the server, but an error in the 19961da177e4SLinus Torvalds * reply path made it appear to have failed. 19971da177e4SLinus Torvalds */ 1998597d9289SBryan Schumaker int nfs_create(struct inode *dir, struct dentry *dentry, 1999ebfc3b49SAl Viro umode_t mode, bool excl) 20001da177e4SLinus Torvalds { 20011da177e4SLinus Torvalds struct iattr attr; 2002ebfc3b49SAl Viro int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; 20031da177e4SLinus Torvalds int error; 20041da177e4SLinus Torvalds 20051e8968c5SNiels de Vos dfprintk(VFS, "NFS: create(%s/%lu), %pd\n", 20066de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 20071da177e4SLinus Torvalds 20081da177e4SLinus Torvalds attr.ia_mode = mode; 20091da177e4SLinus Torvalds attr.ia_valid = ATTR_MODE; 20101da177e4SLinus Torvalds 20118b0ad3d4STrond Myklebust trace_nfs_create_enter(dir, dentry, open_flags); 20128867fe58SMiklos Szeredi error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); 20138b0ad3d4STrond Myklebust trace_nfs_create_exit(dir, dentry, open_flags, error); 20141da177e4SLinus Torvalds if (error != 0) 20151da177e4SLinus Torvalds goto out_err; 20161da177e4SLinus Torvalds return 0; 20171da177e4SLinus Torvalds out_err: 20181da177e4SLinus Torvalds d_drop(dentry); 20191da177e4SLinus Torvalds return error; 20201da177e4SLinus Torvalds } 2021ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_create); 20221da177e4SLinus Torvalds 20231da177e4SLinus Torvalds /* 20241da177e4SLinus Torvalds * See comments for nfs_proc_create regarding failed operations. 20251da177e4SLinus Torvalds */ 2026597d9289SBryan Schumaker int 20271a67aafbSAl Viro nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 20281da177e4SLinus Torvalds { 20291da177e4SLinus Torvalds struct iattr attr; 20301da177e4SLinus Torvalds int status; 20311da177e4SLinus Torvalds 20321e8968c5SNiels de Vos dfprintk(VFS, "NFS: mknod(%s/%lu), %pd\n", 20336de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 20341da177e4SLinus Torvalds 20351da177e4SLinus Torvalds attr.ia_mode = mode; 20361da177e4SLinus Torvalds attr.ia_valid = ATTR_MODE; 20371da177e4SLinus Torvalds 20381ca42382STrond Myklebust trace_nfs_mknod_enter(dir, dentry); 20391da177e4SLinus Torvalds status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); 20401ca42382STrond Myklebust trace_nfs_mknod_exit(dir, dentry, status); 20411da177e4SLinus Torvalds if (status != 0) 20421da177e4SLinus Torvalds goto out_err; 20431da177e4SLinus Torvalds return 0; 20441da177e4SLinus Torvalds out_err: 20451da177e4SLinus Torvalds d_drop(dentry); 20461da177e4SLinus Torvalds return status; 20471da177e4SLinus Torvalds } 2048ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_mknod); 20491da177e4SLinus Torvalds 20501da177e4SLinus Torvalds /* 20511da177e4SLinus Torvalds * See comments for nfs_proc_create regarding failed operations. 20521da177e4SLinus Torvalds */ 2053597d9289SBryan Schumaker int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 20541da177e4SLinus Torvalds { 20551da177e4SLinus Torvalds struct iattr attr; 20561da177e4SLinus Torvalds int error; 20571da177e4SLinus Torvalds 20581e8968c5SNiels de Vos dfprintk(VFS, "NFS: mkdir(%s/%lu), %pd\n", 20596de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 20601da177e4SLinus Torvalds 20611da177e4SLinus Torvalds attr.ia_valid = ATTR_MODE; 20621da177e4SLinus Torvalds attr.ia_mode = mode | S_IFDIR; 20631da177e4SLinus Torvalds 20641ca42382STrond Myklebust trace_nfs_mkdir_enter(dir, dentry); 20651da177e4SLinus Torvalds error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); 20661ca42382STrond Myklebust trace_nfs_mkdir_exit(dir, dentry, error); 20671da177e4SLinus Torvalds if (error != 0) 20681da177e4SLinus Torvalds goto out_err; 20691da177e4SLinus Torvalds return 0; 20701da177e4SLinus Torvalds out_err: 20711da177e4SLinus Torvalds d_drop(dentry); 20721da177e4SLinus Torvalds return error; 20731da177e4SLinus Torvalds } 2074ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_mkdir); 20751da177e4SLinus Torvalds 2076d45b9d8bSTrond Myklebust static void nfs_dentry_handle_enoent(struct dentry *dentry) 2077d45b9d8bSTrond Myklebust { 2078dc3f4198SAl Viro if (simple_positive(dentry)) 2079d45b9d8bSTrond Myklebust d_delete(dentry); 2080d45b9d8bSTrond Myklebust } 2081d45b9d8bSTrond Myklebust 2082597d9289SBryan Schumaker int nfs_rmdir(struct inode *dir, struct dentry *dentry) 20831da177e4SLinus Torvalds { 20841da177e4SLinus Torvalds int error; 20851da177e4SLinus Torvalds 20861e8968c5SNiels de Vos dfprintk(VFS, "NFS: rmdir(%s/%lu), %pd\n", 20876de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 20881da177e4SLinus Torvalds 20891ca42382STrond Myklebust trace_nfs_rmdir_enter(dir, dentry); 20902b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 2091884be175SAl Viro down_write(&NFS_I(d_inode(dentry))->rmdir_sem); 20921da177e4SLinus Torvalds error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); 20931da177e4SLinus Torvalds /* Ensure the VFS deletes this inode */ 2094ba6c0592STrond Myklebust switch (error) { 2095ba6c0592STrond Myklebust case 0: 20962b0143b5SDavid Howells clear_nlink(d_inode(dentry)); 2097ba6c0592STrond Myklebust break; 2098ba6c0592STrond Myklebust case -ENOENT: 2099d45b9d8bSTrond Myklebust nfs_dentry_handle_enoent(dentry); 2100ba6c0592STrond Myklebust } 2101884be175SAl Viro up_write(&NFS_I(d_inode(dentry))->rmdir_sem); 2102ba6c0592STrond Myklebust } else 2103ba6c0592STrond Myklebust error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); 21041ca42382STrond Myklebust trace_nfs_rmdir_exit(dir, dentry, error); 21051da177e4SLinus Torvalds 21061da177e4SLinus Torvalds return error; 21071da177e4SLinus Torvalds } 2108ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_rmdir); 21091da177e4SLinus Torvalds 21101da177e4SLinus Torvalds /* 21111da177e4SLinus Torvalds * Remove a file after making sure there are no pending writes, 21121da177e4SLinus Torvalds * and after checking that the file has only one user. 21131da177e4SLinus Torvalds * 21141da177e4SLinus Torvalds * We invalidate the attribute cache and free the inode prior to the operation 21151da177e4SLinus Torvalds * to avoid possible races if the server reuses the inode. 21161da177e4SLinus Torvalds */ 21171da177e4SLinus Torvalds static int nfs_safe_remove(struct dentry *dentry) 21181da177e4SLinus Torvalds { 21192b0143b5SDavid Howells struct inode *dir = d_inode(dentry->d_parent); 21202b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 21211da177e4SLinus Torvalds int error = -EBUSY; 21221da177e4SLinus Torvalds 21236de1472fSAl Viro dfprintk(VFS, "NFS: safe_remove(%pd2)\n", dentry); 21241da177e4SLinus Torvalds 21251da177e4SLinus Torvalds /* If the dentry was sillyrenamed, we simply call d_delete() */ 21261da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { 21271da177e4SLinus Torvalds error = 0; 21281da177e4SLinus Torvalds goto out; 21291da177e4SLinus Torvalds } 21301da177e4SLinus Torvalds 21311ca42382STrond Myklebust trace_nfs_remove_enter(dir, dentry); 21321da177e4SLinus Torvalds if (inode != NULL) { 2133912678dbSTrond Myklebust error = NFS_PROTO(dir)->remove(dir, dentry); 21341da177e4SLinus Torvalds if (error == 0) 21351b83d707STrond Myklebust nfs_drop_nlink(inode); 21361da177e4SLinus Torvalds } else 2137912678dbSTrond Myklebust error = NFS_PROTO(dir)->remove(dir, dentry); 2138d45b9d8bSTrond Myklebust if (error == -ENOENT) 2139d45b9d8bSTrond Myklebust nfs_dentry_handle_enoent(dentry); 21401ca42382STrond Myklebust trace_nfs_remove_exit(dir, dentry, error); 21411da177e4SLinus Torvalds out: 21421da177e4SLinus Torvalds return error; 21431da177e4SLinus Torvalds } 21441da177e4SLinus Torvalds 21451da177e4SLinus Torvalds /* We do silly rename. In case sillyrename() returns -EBUSY, the inode 21461da177e4SLinus Torvalds * belongs to an active ".nfs..." file and we return -EBUSY. 21471da177e4SLinus Torvalds * 21481da177e4SLinus Torvalds * If sillyrename() returns 0, we do nothing, otherwise we unlink. 21491da177e4SLinus Torvalds */ 2150597d9289SBryan Schumaker int nfs_unlink(struct inode *dir, struct dentry *dentry) 21511da177e4SLinus Torvalds { 21521da177e4SLinus Torvalds int error; 21531da177e4SLinus Torvalds int need_rehash = 0; 21541da177e4SLinus Torvalds 21551e8968c5SNiels de Vos dfprintk(VFS, "NFS: unlink(%s/%lu, %pd)\n", dir->i_sb->s_id, 21566de1472fSAl Viro dir->i_ino, dentry); 21571da177e4SLinus Torvalds 21581ca42382STrond Myklebust trace_nfs_unlink_enter(dir, dentry); 21591da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 216084d08fa8SAl Viro if (d_count(dentry) > 1) { 21611da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 2162ccfeb506STrond Myklebust /* Start asynchronous writeout of the inode */ 21632b0143b5SDavid Howells write_inode_now(d_inode(dentry), 0); 21641da177e4SLinus Torvalds error = nfs_sillyrename(dir, dentry); 21651ca42382STrond Myklebust goto out; 21661da177e4SLinus Torvalds } 21671da177e4SLinus Torvalds if (!d_unhashed(dentry)) { 21681da177e4SLinus Torvalds __d_drop(dentry); 21691da177e4SLinus Torvalds need_rehash = 1; 21701da177e4SLinus Torvalds } 21711da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 21721da177e4SLinus Torvalds error = nfs_safe_remove(dentry); 2173d45b9d8bSTrond Myklebust if (!error || error == -ENOENT) { 21741da177e4SLinus Torvalds nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 21751da177e4SLinus Torvalds } else if (need_rehash) 21761da177e4SLinus Torvalds d_rehash(dentry); 21771ca42382STrond Myklebust out: 21781ca42382STrond Myklebust trace_nfs_unlink_exit(dir, dentry, error); 21791da177e4SLinus Torvalds return error; 21801da177e4SLinus Torvalds } 2181ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_unlink); 21821da177e4SLinus Torvalds 2183873101b3SChuck Lever /* 2184873101b3SChuck Lever * To create a symbolic link, most file systems instantiate a new inode, 2185873101b3SChuck Lever * add a page to it containing the path, then write it out to the disk 2186873101b3SChuck Lever * using prepare_write/commit_write. 2187873101b3SChuck Lever * 2188873101b3SChuck Lever * Unfortunately the NFS client can't create the in-core inode first 2189873101b3SChuck Lever * because it needs a file handle to create an in-core inode (see 2190873101b3SChuck Lever * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the 2191873101b3SChuck Lever * symlink request has completed on the server. 2192873101b3SChuck Lever * 2193873101b3SChuck Lever * So instead we allocate a raw page, copy the symname into it, then do 2194873101b3SChuck Lever * the SYMLINK request with the page as the buffer. If it succeeds, we 2195873101b3SChuck Lever * now have a new file handle and can instantiate an in-core NFS inode 2196873101b3SChuck Lever * and move the raw page into its mapping. 2197873101b3SChuck Lever */ 2198597d9289SBryan Schumaker int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 21991da177e4SLinus Torvalds { 2200873101b3SChuck Lever struct page *page; 2201873101b3SChuck Lever char *kaddr; 22021da177e4SLinus Torvalds struct iattr attr; 2203873101b3SChuck Lever unsigned int pathlen = strlen(symname); 22041da177e4SLinus Torvalds int error; 22051da177e4SLinus Torvalds 22061e8968c5SNiels de Vos dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s)\n", dir->i_sb->s_id, 22076de1472fSAl Viro dir->i_ino, dentry, symname); 22081da177e4SLinus Torvalds 2209873101b3SChuck Lever if (pathlen > PAGE_SIZE) 2210873101b3SChuck Lever return -ENAMETOOLONG; 22111da177e4SLinus Torvalds 2212873101b3SChuck Lever attr.ia_mode = S_IFLNK | S_IRWXUGO; 2213873101b3SChuck Lever attr.ia_valid = ATTR_MODE; 22141da177e4SLinus Torvalds 2215e8ecde25SAl Viro page = alloc_page(GFP_USER); 221676566991STrond Myklebust if (!page) 2217873101b3SChuck Lever return -ENOMEM; 2218873101b3SChuck Lever 2219e8ecde25SAl Viro kaddr = page_address(page); 2220873101b3SChuck Lever memcpy(kaddr, symname, pathlen); 2221873101b3SChuck Lever if (pathlen < PAGE_SIZE) 2222873101b3SChuck Lever memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); 2223873101b3SChuck Lever 22241ca42382STrond Myklebust trace_nfs_symlink_enter(dir, dentry); 222594a6d753SChuck Lever error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); 22261ca42382STrond Myklebust trace_nfs_symlink_exit(dir, dentry, error); 2227873101b3SChuck Lever if (error != 0) { 22281e8968c5SNiels de Vos dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s) error %d\n", 2229873101b3SChuck Lever dir->i_sb->s_id, dir->i_ino, 22306de1472fSAl Viro dentry, symname, error); 22311da177e4SLinus Torvalds d_drop(dentry); 2232873101b3SChuck Lever __free_page(page); 22331da177e4SLinus Torvalds return error; 22341da177e4SLinus Torvalds } 22351da177e4SLinus Torvalds 2236873101b3SChuck Lever /* 2237873101b3SChuck Lever * No big deal if we can't add this page to the page cache here. 2238873101b3SChuck Lever * READLINK will get the missing page from the server if needed. 2239873101b3SChuck Lever */ 22402b0143b5SDavid Howells if (!add_to_page_cache_lru(page, d_inode(dentry)->i_mapping, 0, 2241873101b3SChuck Lever GFP_KERNEL)) { 2242873101b3SChuck Lever SetPageUptodate(page); 2243873101b3SChuck Lever unlock_page(page); 2244a0b54addSRafael Aquini /* 2245a0b54addSRafael Aquini * add_to_page_cache_lru() grabs an extra page refcount. 2246a0b54addSRafael Aquini * Drop it here to avoid leaking this page later. 2247a0b54addSRafael Aquini */ 224809cbfeafSKirill A. Shutemov put_page(page); 2249873101b3SChuck Lever } else 2250873101b3SChuck Lever __free_page(page); 2251873101b3SChuck Lever 2252873101b3SChuck Lever return 0; 2253873101b3SChuck Lever } 2254ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_symlink); 2255873101b3SChuck Lever 2256597d9289SBryan Schumaker int 22571da177e4SLinus Torvalds nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) 22581da177e4SLinus Torvalds { 22592b0143b5SDavid Howells struct inode *inode = d_inode(old_dentry); 22601da177e4SLinus Torvalds int error; 22611da177e4SLinus Torvalds 22626de1472fSAl Viro dfprintk(VFS, "NFS: link(%pd2 -> %pd2)\n", 22636de1472fSAl Viro old_dentry, dentry); 22641da177e4SLinus Torvalds 22651fd1085bSTrond Myklebust trace_nfs_link_enter(inode, dir, dentry); 22669697d234STrond Myklebust d_drop(dentry); 22671da177e4SLinus Torvalds error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); 2268cf809556STrond Myklebust if (error == 0) { 22697de9c6eeSAl Viro ihold(inode); 22709697d234STrond Myklebust d_add(dentry, inode); 2271cf809556STrond Myklebust } 22721fd1085bSTrond Myklebust trace_nfs_link_exit(inode, dir, dentry, error); 22731da177e4SLinus Torvalds return error; 22741da177e4SLinus Torvalds } 2275ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_link); 22761da177e4SLinus Torvalds 22771da177e4SLinus Torvalds /* 22781da177e4SLinus Torvalds * RENAME 22791da177e4SLinus Torvalds * FIXME: Some nfsds, like the Linux user space nfsd, may generate a 22801da177e4SLinus Torvalds * different file handle for the same inode after a rename (e.g. when 22811da177e4SLinus Torvalds * moving to a different directory). A fail-safe method to do so would 22821da177e4SLinus Torvalds * be to look up old_dir/old_name, create a link to new_dir/new_name and 22831da177e4SLinus Torvalds * rename the old file using the sillyrename stuff. This way, the original 22841da177e4SLinus Torvalds * file in old_dir will go away when the last process iput()s the inode. 22851da177e4SLinus Torvalds * 22861da177e4SLinus Torvalds * FIXED. 22871da177e4SLinus Torvalds * 22881da177e4SLinus Torvalds * It actually works quite well. One needs to have the possibility for 22891da177e4SLinus Torvalds * at least one ".nfs..." file in each directory the file ever gets 22901da177e4SLinus Torvalds * moved or linked to which happens automagically with the new 22911da177e4SLinus Torvalds * implementation that only depends on the dcache stuff instead of 22921da177e4SLinus Torvalds * using the inode layer 22931da177e4SLinus Torvalds * 22941da177e4SLinus Torvalds * Unfortunately, things are a little more complicated than indicated 22951da177e4SLinus Torvalds * above. For a cross-directory move, we want to make sure we can get 22961da177e4SLinus Torvalds * rid of the old inode after the operation. This means there must be 22971da177e4SLinus Torvalds * no pending writes (if it's a file), and the use count must be 1. 22981da177e4SLinus Torvalds * If these conditions are met, we can drop the dentries before doing 22991da177e4SLinus Torvalds * the rename. 23001da177e4SLinus Torvalds */ 2301597d9289SBryan Schumaker int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, 23021cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 23031cd66c93SMiklos Szeredi unsigned int flags) 23041da177e4SLinus Torvalds { 23052b0143b5SDavid Howells struct inode *old_inode = d_inode(old_dentry); 23062b0143b5SDavid Howells struct inode *new_inode = d_inode(new_dentry); 2307d9f29500SBenjamin Coddington struct dentry *dentry = NULL, *rehash = NULL; 230880a491fdSJeff Layton struct rpc_task *task; 23091da177e4SLinus Torvalds int error = -EBUSY; 23101da177e4SLinus Torvalds 23111cd66c93SMiklos Szeredi if (flags) 23121cd66c93SMiklos Szeredi return -EINVAL; 23131cd66c93SMiklos Szeredi 23146de1472fSAl Viro dfprintk(VFS, "NFS: rename(%pd2 -> %pd2, ct=%d)\n", 23156de1472fSAl Viro old_dentry, new_dentry, 231684d08fa8SAl Viro d_count(new_dentry)); 23171da177e4SLinus Torvalds 231870ded201STrond Myklebust trace_nfs_rename_enter(old_dir, old_dentry, new_dir, new_dentry); 23191da177e4SLinus Torvalds /* 232028f79a1aSMiklos Szeredi * For non-directories, check whether the target is busy and if so, 232128f79a1aSMiklos Szeredi * make a copy of the dentry and then do a silly-rename. If the 232228f79a1aSMiklos Szeredi * silly-rename succeeds, the copied dentry is hashed and becomes 232328f79a1aSMiklos Szeredi * the new target. 23241da177e4SLinus Torvalds */ 232527226104SMiklos Szeredi if (new_inode && !S_ISDIR(new_inode->i_mode)) { 232627226104SMiklos Szeredi /* 232727226104SMiklos Szeredi * To prevent any new references to the target during the 232827226104SMiklos Szeredi * rename, we unhash the dentry in advance. 232927226104SMiklos Szeredi */ 2330d9f29500SBenjamin Coddington if (!d_unhashed(new_dentry)) { 233127226104SMiklos Szeredi d_drop(new_dentry); 2332d9f29500SBenjamin Coddington rehash = new_dentry; 2333d9f29500SBenjamin Coddington } 233427226104SMiklos Szeredi 233584d08fa8SAl Viro if (d_count(new_dentry) > 2) { 23361da177e4SLinus Torvalds int err; 233727226104SMiklos Szeredi 23381da177e4SLinus Torvalds /* copy the target dentry's name */ 23391da177e4SLinus Torvalds dentry = d_alloc(new_dentry->d_parent, 23401da177e4SLinus Torvalds &new_dentry->d_name); 23411da177e4SLinus Torvalds if (!dentry) 23421da177e4SLinus Torvalds goto out; 23431da177e4SLinus Torvalds 23441da177e4SLinus Torvalds /* silly-rename the existing target ... */ 23451da177e4SLinus Torvalds err = nfs_sillyrename(new_dir, new_dentry); 234624e93025SMiklos Szeredi if (err) 23471da177e4SLinus Torvalds goto out; 234824e93025SMiklos Szeredi 234924e93025SMiklos Szeredi new_dentry = dentry; 2350d9f29500SBenjamin Coddington rehash = NULL; 235124e93025SMiklos Szeredi new_inode = NULL; 2352b1e4adf4STrond Myklebust } 235327226104SMiklos Szeredi } 23541da177e4SLinus Torvalds 2355d9f29500SBenjamin Coddington task = nfs_async_rename(old_dir, new_dir, old_dentry, new_dentry, NULL); 235680a491fdSJeff Layton if (IS_ERR(task)) { 235780a491fdSJeff Layton error = PTR_ERR(task); 235880a491fdSJeff Layton goto out; 235980a491fdSJeff Layton } 236080a491fdSJeff Layton 236180a491fdSJeff Layton error = rpc_wait_for_completion_task(task); 2362818a8dbeSBenjamin Coddington if (error != 0) { 2363818a8dbeSBenjamin Coddington ((struct nfs_renamedata *)task->tk_calldata)->cancelled = 1; 2364818a8dbeSBenjamin Coddington /* Paired with the atomic_dec_and_test() barrier in rpc_do_put_task() */ 2365818a8dbeSBenjamin Coddington smp_wmb(); 2366818a8dbeSBenjamin Coddington } else 236780a491fdSJeff Layton error = task->tk_status; 236880a491fdSJeff Layton rpc_put_task(task); 236959a707b0STrond Myklebust /* Ensure the inode attributes are revalidated */ 237059a707b0STrond Myklebust if (error == 0) { 237159a707b0STrond Myklebust spin_lock(&old_inode->i_lock); 237259a707b0STrond Myklebust NFS_I(old_inode)->attr_gencount = nfs_inc_attr_generation_counter(); 237359a707b0STrond Myklebust NFS_I(old_inode)->cache_validity |= NFS_INO_INVALID_CHANGE 237459a707b0STrond Myklebust | NFS_INO_INVALID_CTIME 237559a707b0STrond Myklebust | NFS_INO_REVAL_FORCED; 237659a707b0STrond Myklebust spin_unlock(&old_inode->i_lock); 237759a707b0STrond Myklebust } 23781da177e4SLinus Torvalds out: 2379d9f29500SBenjamin Coddington if (rehash) 2380d9f29500SBenjamin Coddington d_rehash(rehash); 238170ded201STrond Myklebust trace_nfs_rename_exit(old_dir, old_dentry, 238270ded201STrond Myklebust new_dir, new_dentry, error); 2383d9f29500SBenjamin Coddington if (!error) { 2384d9f29500SBenjamin Coddington if (new_inode != NULL) 2385d9f29500SBenjamin Coddington nfs_drop_nlink(new_inode); 2386d9f29500SBenjamin Coddington /* 2387d9f29500SBenjamin Coddington * The d_move() should be here instead of in an async RPC completion 2388d9f29500SBenjamin Coddington * handler because we need the proper locks to move the dentry. If 2389d9f29500SBenjamin Coddington * we're interrupted by a signal, the async RPC completion handler 2390d9f29500SBenjamin Coddington * should mark the directories for revalidation. 2391d9f29500SBenjamin Coddington */ 2392d9f29500SBenjamin Coddington d_move(old_dentry, new_dentry); 2393d803224cSTrond Myklebust nfs_set_verifier(old_dentry, 2394d9f29500SBenjamin Coddington nfs_save_change_attribute(new_dir)); 2395d9f29500SBenjamin Coddington } else if (error == -ENOENT) 2396d9f29500SBenjamin Coddington nfs_dentry_handle_enoent(old_dentry); 2397d9f29500SBenjamin Coddington 23981da177e4SLinus Torvalds /* new dentry created? */ 23991da177e4SLinus Torvalds if (dentry) 24001da177e4SLinus Torvalds dput(dentry); 24011da177e4SLinus Torvalds return error; 24021da177e4SLinus Torvalds } 2403ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_rename); 24041da177e4SLinus Torvalds 2405cfcea3e8STrond Myklebust static DEFINE_SPINLOCK(nfs_access_lru_lock); 2406cfcea3e8STrond Myklebust static LIST_HEAD(nfs_access_lru_list); 2407cfcea3e8STrond Myklebust static atomic_long_t nfs_access_nr_entries; 2408cfcea3e8STrond Myklebust 2409a8b373eeSTrond Myklebust static unsigned long nfs_access_max_cachesize = 4*1024*1024; 24103a505845STrond Myklebust module_param(nfs_access_max_cachesize, ulong, 0644); 24113a505845STrond Myklebust MODULE_PARM_DESC(nfs_access_max_cachesize, "NFS access maximum total cache length"); 24123a505845STrond Myklebust 24131c3c07e9STrond Myklebust static void nfs_access_free_entry(struct nfs_access_entry *entry) 24141c3c07e9STrond Myklebust { 2415b68572e0SNeilBrown put_cred(entry->cred); 2416f682a398SNeilBrown kfree_rcu(entry, rcu_head); 24174e857c58SPeter Zijlstra smp_mb__before_atomic(); 2418cfcea3e8STrond Myklebust atomic_long_dec(&nfs_access_nr_entries); 24194e857c58SPeter Zijlstra smp_mb__after_atomic(); 24201c3c07e9STrond Myklebust } 24211c3c07e9STrond Myklebust 24221a81bb8aSTrond Myklebust static void nfs_access_free_list(struct list_head *head) 24231a81bb8aSTrond Myklebust { 24241a81bb8aSTrond Myklebust struct nfs_access_entry *cache; 24251a81bb8aSTrond Myklebust 24261a81bb8aSTrond Myklebust while (!list_empty(head)) { 24271a81bb8aSTrond Myklebust cache = list_entry(head->next, struct nfs_access_entry, lru); 24281a81bb8aSTrond Myklebust list_del(&cache->lru); 24291a81bb8aSTrond Myklebust nfs_access_free_entry(cache); 24301a81bb8aSTrond Myklebust } 24311a81bb8aSTrond Myklebust } 24321a81bb8aSTrond Myklebust 24333a505845STrond Myklebust static unsigned long 24343a505845STrond Myklebust nfs_do_access_cache_scan(unsigned int nr_to_scan) 2435979df72eSTrond Myklebust { 2436979df72eSTrond Myklebust LIST_HEAD(head); 2437aa510da5STrond Myklebust struct nfs_inode *nfsi, *next; 2438979df72eSTrond Myklebust struct nfs_access_entry *cache; 24391ab6c499SDave Chinner long freed = 0; 2440979df72eSTrond Myklebust 2441a50f7951STrond Myklebust spin_lock(&nfs_access_lru_lock); 2442aa510da5STrond Myklebust list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { 2443979df72eSTrond Myklebust struct inode *inode; 2444979df72eSTrond Myklebust 2445979df72eSTrond Myklebust if (nr_to_scan-- == 0) 2446979df72eSTrond Myklebust break; 24479c7e7e23STrond Myklebust inode = &nfsi->vfs_inode; 2448979df72eSTrond Myklebust spin_lock(&inode->i_lock); 2449979df72eSTrond Myklebust if (list_empty(&nfsi->access_cache_entry_lru)) 2450979df72eSTrond Myklebust goto remove_lru_entry; 2451979df72eSTrond Myklebust cache = list_entry(nfsi->access_cache_entry_lru.next, 2452979df72eSTrond Myklebust struct nfs_access_entry, lru); 2453979df72eSTrond Myklebust list_move(&cache->lru, &head); 2454979df72eSTrond Myklebust rb_erase(&cache->rb_node, &nfsi->access_cache); 24551ab6c499SDave Chinner freed++; 2456979df72eSTrond Myklebust if (!list_empty(&nfsi->access_cache_entry_lru)) 2457979df72eSTrond Myklebust list_move_tail(&nfsi->access_cache_inode_lru, 2458979df72eSTrond Myklebust &nfs_access_lru_list); 2459979df72eSTrond Myklebust else { 2460979df72eSTrond Myklebust remove_lru_entry: 2461979df72eSTrond Myklebust list_del_init(&nfsi->access_cache_inode_lru); 24624e857c58SPeter Zijlstra smp_mb__before_atomic(); 2463979df72eSTrond Myklebust clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); 24644e857c58SPeter Zijlstra smp_mb__after_atomic(); 2465979df72eSTrond Myklebust } 246659844a9bSTrond Myklebust spin_unlock(&inode->i_lock); 2467979df72eSTrond Myklebust } 2468979df72eSTrond Myklebust spin_unlock(&nfs_access_lru_lock); 24691a81bb8aSTrond Myklebust nfs_access_free_list(&head); 24701ab6c499SDave Chinner return freed; 24711ab6c499SDave Chinner } 24721ab6c499SDave Chinner 24731ab6c499SDave Chinner unsigned long 24743a505845STrond Myklebust nfs_access_cache_scan(struct shrinker *shrink, struct shrink_control *sc) 24753a505845STrond Myklebust { 24763a505845STrond Myklebust int nr_to_scan = sc->nr_to_scan; 24773a505845STrond Myklebust gfp_t gfp_mask = sc->gfp_mask; 24783a505845STrond Myklebust 24793a505845STrond Myklebust if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) 24803a505845STrond Myklebust return SHRINK_STOP; 24813a505845STrond Myklebust return nfs_do_access_cache_scan(nr_to_scan); 24823a505845STrond Myklebust } 24833a505845STrond Myklebust 24843a505845STrond Myklebust 24853a505845STrond Myklebust unsigned long 24861ab6c499SDave Chinner nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc) 24871ab6c499SDave Chinner { 248855f841ceSGlauber Costa return vfs_pressure_ratio(atomic_long_read(&nfs_access_nr_entries)); 2489979df72eSTrond Myklebust } 2490979df72eSTrond Myklebust 24913a505845STrond Myklebust static void 24923a505845STrond Myklebust nfs_access_cache_enforce_limit(void) 24933a505845STrond Myklebust { 24943a505845STrond Myklebust long nr_entries = atomic_long_read(&nfs_access_nr_entries); 24953a505845STrond Myklebust unsigned long diff; 24963a505845STrond Myklebust unsigned int nr_to_scan; 24973a505845STrond Myklebust 24983a505845STrond Myklebust if (nr_entries < 0 || nr_entries <= nfs_access_max_cachesize) 24993a505845STrond Myklebust return; 25003a505845STrond Myklebust nr_to_scan = 100; 25013a505845STrond Myklebust diff = nr_entries - nfs_access_max_cachesize; 25023a505845STrond Myklebust if (diff < nr_to_scan) 25033a505845STrond Myklebust nr_to_scan = diff; 25043a505845STrond Myklebust nfs_do_access_cache_scan(nr_to_scan); 25053a505845STrond Myklebust } 25063a505845STrond Myklebust 25071a81bb8aSTrond Myklebust static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) 25081c3c07e9STrond Myklebust { 25091c3c07e9STrond Myklebust struct rb_root *root_node = &nfsi->access_cache; 25101a81bb8aSTrond Myklebust struct rb_node *n; 25111c3c07e9STrond Myklebust struct nfs_access_entry *entry; 25121c3c07e9STrond Myklebust 25131c3c07e9STrond Myklebust /* Unhook entries from the cache */ 25141c3c07e9STrond Myklebust while ((n = rb_first(root_node)) != NULL) { 25151c3c07e9STrond Myklebust entry = rb_entry(n, struct nfs_access_entry, rb_node); 25161c3c07e9STrond Myklebust rb_erase(n, root_node); 25171a81bb8aSTrond Myklebust list_move(&entry->lru, head); 25181c3c07e9STrond Myklebust } 25191c3c07e9STrond Myklebust nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; 25201c3c07e9STrond Myklebust } 25211c3c07e9STrond Myklebust 25221c3c07e9STrond Myklebust void nfs_access_zap_cache(struct inode *inode) 25231c3c07e9STrond Myklebust { 25241a81bb8aSTrond Myklebust LIST_HEAD(head); 25251a81bb8aSTrond Myklebust 25261a81bb8aSTrond Myklebust if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) 25271a81bb8aSTrond Myklebust return; 2528cfcea3e8STrond Myklebust /* Remove from global LRU init */ 2529cfcea3e8STrond Myklebust spin_lock(&nfs_access_lru_lock); 25301a81bb8aSTrond Myklebust if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) 2531cfcea3e8STrond Myklebust list_del_init(&NFS_I(inode)->access_cache_inode_lru); 2532cfcea3e8STrond Myklebust 25331c3c07e9STrond Myklebust spin_lock(&inode->i_lock); 25341a81bb8aSTrond Myklebust __nfs_access_zap_cache(NFS_I(inode), &head); 25351a81bb8aSTrond Myklebust spin_unlock(&inode->i_lock); 25361a81bb8aSTrond Myklebust spin_unlock(&nfs_access_lru_lock); 25371a81bb8aSTrond Myklebust nfs_access_free_list(&head); 25381c3c07e9STrond Myklebust } 25391c606fb7SBryan Schumaker EXPORT_SYMBOL_GPL(nfs_access_zap_cache); 25401c3c07e9STrond Myklebust 2541b68572e0SNeilBrown static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, const struct cred *cred) 25421c3c07e9STrond Myklebust { 25431c3c07e9STrond Myklebust struct rb_node *n = NFS_I(inode)->access_cache.rb_node; 25441c3c07e9STrond Myklebust 25451c3c07e9STrond Myklebust while (n != NULL) { 2546b68572e0SNeilBrown struct nfs_access_entry *entry = 2547b68572e0SNeilBrown rb_entry(n, struct nfs_access_entry, rb_node); 2548b68572e0SNeilBrown int cmp = cred_fscmp(cred, entry->cred); 25491c3c07e9STrond Myklebust 2550b68572e0SNeilBrown if (cmp < 0) 25511c3c07e9STrond Myklebust n = n->rb_left; 2552b68572e0SNeilBrown else if (cmp > 0) 25531c3c07e9STrond Myklebust n = n->rb_right; 25541c3c07e9STrond Myklebust else 25551c3c07e9STrond Myklebust return entry; 25561c3c07e9STrond Myklebust } 25571c3c07e9STrond Myklebust return NULL; 25581c3c07e9STrond Myklebust } 25591c3c07e9STrond Myklebust 2560d2ae4f8bSFrank van der Linden static int nfs_access_get_cached_locked(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res, bool may_block) 25611da177e4SLinus Torvalds { 256255296809SChuck Lever struct nfs_inode *nfsi = NFS_I(inode); 25631c3c07e9STrond Myklebust struct nfs_access_entry *cache; 256457b69181STrond Myklebust bool retry = true; 256557b69181STrond Myklebust int err; 25661da177e4SLinus Torvalds 25671c3c07e9STrond Myklebust spin_lock(&inode->i_lock); 256857b69181STrond Myklebust for(;;) { 25691c3c07e9STrond Myklebust if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) 25701c3c07e9STrond Myklebust goto out_zap; 25711c3c07e9STrond Myklebust cache = nfs_access_search_rbtree(inode, cred); 257257b69181STrond Myklebust err = -ENOENT; 25731c3c07e9STrond Myklebust if (cache == NULL) 25741c3c07e9STrond Myklebust goto out; 257557b69181STrond Myklebust /* Found an entry, is our attribute cache valid? */ 257621c3ba7eSTrond Myklebust if (!nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) 257757b69181STrond Myklebust break; 25785c965db8STrond Myklebust if (!retry) 25795c965db8STrond Myklebust break; 258057b69181STrond Myklebust err = -ECHILD; 258157b69181STrond Myklebust if (!may_block) 258257b69181STrond Myklebust goto out; 258357b69181STrond Myklebust spin_unlock(&inode->i_lock); 258457b69181STrond Myklebust err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 258557b69181STrond Myklebust if (err) 258657b69181STrond Myklebust return err; 258757b69181STrond Myklebust spin_lock(&inode->i_lock); 258857b69181STrond Myklebust retry = false; 258957b69181STrond Myklebust } 25901c3c07e9STrond Myklebust res->cred = cache->cred; 25911c3c07e9STrond Myklebust res->mask = cache->mask; 2592cfcea3e8STrond Myklebust list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); 25931c3c07e9STrond Myklebust err = 0; 25941c3c07e9STrond Myklebust out: 25951c3c07e9STrond Myklebust spin_unlock(&inode->i_lock); 25961c3c07e9STrond Myklebust return err; 25971c3c07e9STrond Myklebust out_zap: 25981a81bb8aSTrond Myklebust spin_unlock(&inode->i_lock); 25991a81bb8aSTrond Myklebust nfs_access_zap_cache(inode); 26001c3c07e9STrond Myklebust return -ENOENT; 26011c3c07e9STrond Myklebust } 26021c3c07e9STrond Myklebust 2603b68572e0SNeilBrown static int nfs_access_get_cached_rcu(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res) 2604f682a398SNeilBrown { 2605f682a398SNeilBrown /* Only check the most recently returned cache entry, 2606f682a398SNeilBrown * but do it without locking. 2607f682a398SNeilBrown */ 2608f682a398SNeilBrown struct nfs_inode *nfsi = NFS_I(inode); 2609f682a398SNeilBrown struct nfs_access_entry *cache; 2610f682a398SNeilBrown int err = -ECHILD; 2611f682a398SNeilBrown struct list_head *lh; 2612f682a398SNeilBrown 2613f682a398SNeilBrown rcu_read_lock(); 2614f682a398SNeilBrown if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) 2615f682a398SNeilBrown goto out; 26169f01eb5dSMadhuparna Bhowmik lh = rcu_dereference(list_tail_rcu(&nfsi->access_cache_entry_lru)); 2617f682a398SNeilBrown cache = list_entry(lh, struct nfs_access_entry, lru); 2618f682a398SNeilBrown if (lh == &nfsi->access_cache_entry_lru || 26199a206de2STrond Myklebust cred_fscmp(cred, cache->cred) != 0) 2620f682a398SNeilBrown cache = NULL; 2621f682a398SNeilBrown if (cache == NULL) 2622f682a398SNeilBrown goto out; 262321c3ba7eSTrond Myklebust if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) 2624f682a398SNeilBrown goto out; 2625f682a398SNeilBrown res->cred = cache->cred; 2626f682a398SNeilBrown res->mask = cache->mask; 262721c3ba7eSTrond Myklebust err = 0; 2628f682a398SNeilBrown out: 2629f682a398SNeilBrown rcu_read_unlock(); 2630f682a398SNeilBrown return err; 2631f682a398SNeilBrown } 2632f682a398SNeilBrown 2633d2ae4f8bSFrank van der Linden int nfs_access_get_cached(struct inode *inode, const struct cred *cred, struct 2634d2ae4f8bSFrank van der Linden nfs_access_entry *res, bool may_block) 2635d2ae4f8bSFrank van der Linden { 2636d2ae4f8bSFrank van der Linden int status; 2637d2ae4f8bSFrank van der Linden 2638d2ae4f8bSFrank van der Linden status = nfs_access_get_cached_rcu(inode, cred, res); 2639d2ae4f8bSFrank van der Linden if (status != 0) 2640d2ae4f8bSFrank van der Linden status = nfs_access_get_cached_locked(inode, cred, res, 2641d2ae4f8bSFrank van der Linden may_block); 2642d2ae4f8bSFrank van der Linden 2643d2ae4f8bSFrank van der Linden return status; 2644d2ae4f8bSFrank van der Linden } 2645d2ae4f8bSFrank van der Linden EXPORT_SYMBOL_GPL(nfs_access_get_cached); 2646d2ae4f8bSFrank van der Linden 26471c3c07e9STrond Myklebust static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) 26481c3c07e9STrond Myklebust { 2649cfcea3e8STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 2650cfcea3e8STrond Myklebust struct rb_root *root_node = &nfsi->access_cache; 26511c3c07e9STrond Myklebust struct rb_node **p = &root_node->rb_node; 26521c3c07e9STrond Myklebust struct rb_node *parent = NULL; 26531c3c07e9STrond Myklebust struct nfs_access_entry *entry; 2654b68572e0SNeilBrown int cmp; 26551c3c07e9STrond Myklebust 26561c3c07e9STrond Myklebust spin_lock(&inode->i_lock); 26571c3c07e9STrond Myklebust while (*p != NULL) { 26581c3c07e9STrond Myklebust parent = *p; 26591c3c07e9STrond Myklebust entry = rb_entry(parent, struct nfs_access_entry, rb_node); 2660b68572e0SNeilBrown cmp = cred_fscmp(set->cred, entry->cred); 26611c3c07e9STrond Myklebust 2662b68572e0SNeilBrown if (cmp < 0) 26631c3c07e9STrond Myklebust p = &parent->rb_left; 2664b68572e0SNeilBrown else if (cmp > 0) 26651c3c07e9STrond Myklebust p = &parent->rb_right; 26661c3c07e9STrond Myklebust else 26671c3c07e9STrond Myklebust goto found; 26681c3c07e9STrond Myklebust } 26691c3c07e9STrond Myklebust rb_link_node(&set->rb_node, parent, p); 26701c3c07e9STrond Myklebust rb_insert_color(&set->rb_node, root_node); 2671cfcea3e8STrond Myklebust list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); 26721c3c07e9STrond Myklebust spin_unlock(&inode->i_lock); 26731c3c07e9STrond Myklebust return; 26741c3c07e9STrond Myklebust found: 26751c3c07e9STrond Myklebust rb_replace_node(parent, &set->rb_node, root_node); 2676cfcea3e8STrond Myklebust list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); 2677cfcea3e8STrond Myklebust list_del(&entry->lru); 26781c3c07e9STrond Myklebust spin_unlock(&inode->i_lock); 26791c3c07e9STrond Myklebust nfs_access_free_entry(entry); 26801da177e4SLinus Torvalds } 26811da177e4SLinus Torvalds 26826168f62cSWeston Andros Adamson void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) 26831da177e4SLinus Torvalds { 26841c3c07e9STrond Myklebust struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); 26851c3c07e9STrond Myklebust if (cache == NULL) 26861c3c07e9STrond Myklebust return; 26871c3c07e9STrond Myklebust RB_CLEAR_NODE(&cache->rb_node); 2688b68572e0SNeilBrown cache->cred = get_cred(set->cred); 26891da177e4SLinus Torvalds cache->mask = set->mask; 26901c3c07e9STrond Myklebust 2691f682a398SNeilBrown /* The above field assignments must be visible 2692f682a398SNeilBrown * before this item appears on the lru. We cannot easily 2693f682a398SNeilBrown * use rcu_assign_pointer, so just force the memory barrier. 2694f682a398SNeilBrown */ 2695f682a398SNeilBrown smp_wmb(); 26961c3c07e9STrond Myklebust nfs_access_add_rbtree(inode, cache); 2697cfcea3e8STrond Myklebust 2698cfcea3e8STrond Myklebust /* Update accounting */ 26994e857c58SPeter Zijlstra smp_mb__before_atomic(); 2700cfcea3e8STrond Myklebust atomic_long_inc(&nfs_access_nr_entries); 27014e857c58SPeter Zijlstra smp_mb__after_atomic(); 2702cfcea3e8STrond Myklebust 2703cfcea3e8STrond Myklebust /* Add inode to global LRU list */ 27041a81bb8aSTrond Myklebust if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { 2705cfcea3e8STrond Myklebust spin_lock(&nfs_access_lru_lock); 27061a81bb8aSTrond Myklebust if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) 27071a81bb8aSTrond Myklebust list_add_tail(&NFS_I(inode)->access_cache_inode_lru, 27081a81bb8aSTrond Myklebust &nfs_access_lru_list); 2709cfcea3e8STrond Myklebust spin_unlock(&nfs_access_lru_lock); 2710cfcea3e8STrond Myklebust } 27113a505845STrond Myklebust nfs_access_cache_enforce_limit(); 27121da177e4SLinus Torvalds } 27136168f62cSWeston Andros Adamson EXPORT_SYMBOL_GPL(nfs_access_add_cache); 27146168f62cSWeston Andros Adamson 27153c181827SAnna Schumaker #define NFS_MAY_READ (NFS_ACCESS_READ) 27163c181827SAnna Schumaker #define NFS_MAY_WRITE (NFS_ACCESS_MODIFY | \ 27173c181827SAnna Schumaker NFS_ACCESS_EXTEND | \ 27183c181827SAnna Schumaker NFS_ACCESS_DELETE) 27193c181827SAnna Schumaker #define NFS_FILE_MAY_WRITE (NFS_ACCESS_MODIFY | \ 27203c181827SAnna Schumaker NFS_ACCESS_EXTEND) 2721ecbb903cSTrond Myklebust #define NFS_DIR_MAY_WRITE NFS_MAY_WRITE 27223c181827SAnna Schumaker #define NFS_MAY_LOOKUP (NFS_ACCESS_LOOKUP) 27233c181827SAnna Schumaker #define NFS_MAY_EXECUTE (NFS_ACCESS_EXECUTE) 272415d4b73aSTrond Myklebust static int 2725ecbb903cSTrond Myklebust nfs_access_calc_mask(u32 access_result, umode_t umode) 272615d4b73aSTrond Myklebust { 272715d4b73aSTrond Myklebust int mask = 0; 272815d4b73aSTrond Myklebust 272915d4b73aSTrond Myklebust if (access_result & NFS_MAY_READ) 273015d4b73aSTrond Myklebust mask |= MAY_READ; 2731ecbb903cSTrond Myklebust if (S_ISDIR(umode)) { 2732ecbb903cSTrond Myklebust if ((access_result & NFS_DIR_MAY_WRITE) == NFS_DIR_MAY_WRITE) 273315d4b73aSTrond Myklebust mask |= MAY_WRITE; 2734ecbb903cSTrond Myklebust if ((access_result & NFS_MAY_LOOKUP) == NFS_MAY_LOOKUP) 273515d4b73aSTrond Myklebust mask |= MAY_EXEC; 2736ecbb903cSTrond Myklebust } else if (S_ISREG(umode)) { 2737ecbb903cSTrond Myklebust if ((access_result & NFS_FILE_MAY_WRITE) == NFS_FILE_MAY_WRITE) 2738ecbb903cSTrond Myklebust mask |= MAY_WRITE; 2739ecbb903cSTrond Myklebust if ((access_result & NFS_MAY_EXECUTE) == NFS_MAY_EXECUTE) 274015d4b73aSTrond Myklebust mask |= MAY_EXEC; 2741ecbb903cSTrond Myklebust } else if (access_result & NFS_MAY_WRITE) 2742ecbb903cSTrond Myklebust mask |= MAY_WRITE; 274315d4b73aSTrond Myklebust return mask; 274415d4b73aSTrond Myklebust } 274515d4b73aSTrond Myklebust 27466168f62cSWeston Andros Adamson void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result) 27476168f62cSWeston Andros Adamson { 2748bd8b2441STrond Myklebust entry->mask = access_result; 27496168f62cSWeston Andros Adamson } 27506168f62cSWeston Andros Adamson EXPORT_SYMBOL_GPL(nfs_access_set_mask); 27511da177e4SLinus Torvalds 2752b68572e0SNeilBrown static int nfs_do_access(struct inode *inode, const struct cred *cred, int mask) 27531da177e4SLinus Torvalds { 27541da177e4SLinus Torvalds struct nfs_access_entry cache; 275557b69181STrond Myklebust bool may_block = (mask & MAY_NOT_BLOCK) == 0; 2756e8194b7dSTrond Myklebust int cache_mask = -1; 27571da177e4SLinus Torvalds int status; 27581da177e4SLinus Torvalds 2759f4ce1299STrond Myklebust trace_nfs_access_enter(inode); 2760f4ce1299STrond Myklebust 276157b69181STrond Myklebust status = nfs_access_get_cached(inode, cred, &cache, may_block); 27621da177e4SLinus Torvalds if (status == 0) 2763f4ce1299STrond Myklebust goto out_cached; 27641da177e4SLinus Torvalds 2765f3324a2aSNeilBrown status = -ECHILD; 276657b69181STrond Myklebust if (!may_block) 2767f3324a2aSNeilBrown goto out; 2768f3324a2aSNeilBrown 27691750d929SAnna Schumaker /* 27701750d929SAnna Schumaker * Determine which access bits we want to ask for... 27711750d929SAnna Schumaker */ 27721750d929SAnna Schumaker cache.mask = NFS_ACCESS_READ | NFS_ACCESS_MODIFY | NFS_ACCESS_EXTEND; 277372832a24SFrank van der Linden if (nfs_server_capable(inode, NFS_CAP_XATTR)) { 277472832a24SFrank van der Linden cache.mask |= NFS_ACCESS_XAREAD | NFS_ACCESS_XAWRITE | 277572832a24SFrank van der Linden NFS_ACCESS_XALIST; 277672832a24SFrank van der Linden } 27771750d929SAnna Schumaker if (S_ISDIR(inode->i_mode)) 27781750d929SAnna Schumaker cache.mask |= NFS_ACCESS_DELETE | NFS_ACCESS_LOOKUP; 27791750d929SAnna Schumaker else 27801750d929SAnna Schumaker cache.mask |= NFS_ACCESS_EXECUTE; 27811da177e4SLinus Torvalds cache.cred = cred; 27821da177e4SLinus Torvalds status = NFS_PROTO(inode)->access(inode, &cache); 2783a71ee337SSuresh Jayaraman if (status != 0) { 2784a71ee337SSuresh Jayaraman if (status == -ESTALE) { 2785a71ee337SSuresh Jayaraman if (!S_ISDIR(inode->i_mode)) 278693ce4af7STrond Myklebust nfs_set_inode_stale(inode); 278793ce4af7STrond Myklebust else 278893ce4af7STrond Myklebust nfs_zap_caches(inode); 2789a71ee337SSuresh Jayaraman } 2790f4ce1299STrond Myklebust goto out; 2791a71ee337SSuresh Jayaraman } 27921da177e4SLinus Torvalds nfs_access_add_cache(inode, &cache); 2793f4ce1299STrond Myklebust out_cached: 2794ecbb903cSTrond Myklebust cache_mask = nfs_access_calc_mask(cache.mask, inode->i_mode); 2795bd8b2441STrond Myklebust if ((mask & ~cache_mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) != 0) 2796f4ce1299STrond Myklebust status = -EACCES; 27971da177e4SLinus Torvalds out: 2798e8194b7dSTrond Myklebust trace_nfs_access_exit(inode, mask, cache_mask, status); 2799f4ce1299STrond Myklebust return status; 28001da177e4SLinus Torvalds } 28011da177e4SLinus Torvalds 2802af22f94aSTrond Myklebust static int nfs_open_permission_mask(int openflags) 2803af22f94aSTrond Myklebust { 2804af22f94aSTrond Myklebust int mask = 0; 2805af22f94aSTrond Myklebust 2806f8d9a897SWeston Andros Adamson if (openflags & __FMODE_EXEC) { 2807f8d9a897SWeston Andros Adamson /* ONLY check exec rights */ 2808f8d9a897SWeston Andros Adamson mask = MAY_EXEC; 2809f8d9a897SWeston Andros Adamson } else { 28108a5e929dSAl Viro if ((openflags & O_ACCMODE) != O_WRONLY) 2811af22f94aSTrond Myklebust mask |= MAY_READ; 28128a5e929dSAl Viro if ((openflags & O_ACCMODE) != O_RDONLY) 2813af22f94aSTrond Myklebust mask |= MAY_WRITE; 2814f8d9a897SWeston Andros Adamson } 2815f8d9a897SWeston Andros Adamson 2816af22f94aSTrond Myklebust return mask; 2817af22f94aSTrond Myklebust } 2818af22f94aSTrond Myklebust 2819b68572e0SNeilBrown int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags) 2820af22f94aSTrond Myklebust { 2821af22f94aSTrond Myklebust return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); 2822af22f94aSTrond Myklebust } 282389d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_may_open); 2824af22f94aSTrond Myklebust 28255c5fc09aSTrond Myklebust static int nfs_execute_ok(struct inode *inode, int mask) 28265c5fc09aSTrond Myklebust { 28275c5fc09aSTrond Myklebust struct nfs_server *server = NFS_SERVER(inode); 282821c3ba7eSTrond Myklebust int ret = 0; 28295c5fc09aSTrond Myklebust 28303825827eSTrond Myklebust if (S_ISDIR(inode->i_mode)) 28313825827eSTrond Myklebust return 0; 2832cf834027STrond Myklebust if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_OTHER)) { 28335c5fc09aSTrond Myklebust if (mask & MAY_NOT_BLOCK) 283421c3ba7eSTrond Myklebust return -ECHILD; 283521c3ba7eSTrond Myklebust ret = __nfs_revalidate_inode(server, inode); 283621c3ba7eSTrond Myklebust } 28375c5fc09aSTrond Myklebust if (ret == 0 && !execute_ok(inode)) 28385c5fc09aSTrond Myklebust ret = -EACCES; 28395c5fc09aSTrond Myklebust return ret; 28405c5fc09aSTrond Myklebust } 28415c5fc09aSTrond Myklebust 284210556cb2SAl Viro int nfs_permission(struct inode *inode, int mask) 28431da177e4SLinus Torvalds { 2844b68572e0SNeilBrown const struct cred *cred = current_cred(); 28451da177e4SLinus Torvalds int res = 0; 28461da177e4SLinus Torvalds 284791d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSACCESS); 284891d5b470SChuck Lever 2849e6305c43SAl Viro if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) 28501da177e4SLinus Torvalds goto out; 28511da177e4SLinus Torvalds /* Is this sys_access() ? */ 28529cfcac81SEric Paris if (mask & (MAY_ACCESS | MAY_CHDIR)) 28531da177e4SLinus Torvalds goto force_lookup; 28541da177e4SLinus Torvalds 28551da177e4SLinus Torvalds switch (inode->i_mode & S_IFMT) { 28561da177e4SLinus Torvalds case S_IFLNK: 28571da177e4SLinus Torvalds goto out; 28581da177e4SLinus Torvalds case S_IFREG: 2859762674f8STrond Myklebust if ((mask & MAY_OPEN) && 2860762674f8STrond Myklebust nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN)) 2861762674f8STrond Myklebust return 0; 28621da177e4SLinus Torvalds break; 28631da177e4SLinus Torvalds case S_IFDIR: 28641da177e4SLinus Torvalds /* 28651da177e4SLinus Torvalds * Optimize away all write operations, since the server 28661da177e4SLinus Torvalds * will check permissions when we perform the op. 28671da177e4SLinus Torvalds */ 28681da177e4SLinus Torvalds if ((mask & MAY_WRITE) && !(mask & MAY_READ)) 28691da177e4SLinus Torvalds goto out; 28701da177e4SLinus Torvalds } 28711da177e4SLinus Torvalds 28721da177e4SLinus Torvalds force_lookup: 28731da177e4SLinus Torvalds if (!NFS_PROTO(inode)->access) 28741da177e4SLinus Torvalds goto out_notsup; 28751da177e4SLinus Torvalds 28761da177e4SLinus Torvalds res = nfs_do_access(inode, cred, mask); 28771da177e4SLinus Torvalds out: 28785c5fc09aSTrond Myklebust if (!res && (mask & MAY_EXEC)) 28795c5fc09aSTrond Myklebust res = nfs_execute_ok(inode, mask); 2880f696a365SMiklos Szeredi 28811e8968c5SNiels de Vos dfprintk(VFS, "NFS: permission(%s/%lu), mask=0x%x, res=%d\n", 28821e7cb3dcSChuck Lever inode->i_sb->s_id, inode->i_ino, mask, res); 28831da177e4SLinus Torvalds return res; 28841da177e4SLinus Torvalds out_notsup: 2885d51ac1a8SNeilBrown if (mask & MAY_NOT_BLOCK) 2886d51ac1a8SNeilBrown return -ECHILD; 2887d51ac1a8SNeilBrown 28881da177e4SLinus Torvalds res = nfs_revalidate_inode(NFS_SERVER(inode), inode); 28891da177e4SLinus Torvalds if (res == 0) 28902830ba7fSAl Viro res = generic_permission(inode, mask); 28911e7cb3dcSChuck Lever goto out; 28921da177e4SLinus Torvalds } 2893ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_permission); 28941da177e4SLinus Torvalds 28951da177e4SLinus Torvalds /* 28961da177e4SLinus Torvalds * Local variables: 28971da177e4SLinus Torvalds * version-control: t 28981da177e4SLinus Torvalds * kept-new-versions: 5 28991da177e4SLinus Torvalds * End: 29001da177e4SLinus Torvalds */ 2901