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 71684f39b4SNeilBrown static struct nfs_open_dir_context *alloc_nfs_open_dir_context(struct inode *dir, const struct cred *cred) 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; 81684f39b4SNeilBrown ctx->cred = get_cred(cred); 82311324adSTrond Myklebust spin_lock(&dir->i_lock); 831c341b77STrond Myklebust if (list_empty(&nfsi->open_files) && 841c341b77STrond Myklebust (nfsi->cache_validity & NFS_INO_DATA_INVAL_DEFER)) 851c341b77STrond Myklebust nfsi->cache_validity |= NFS_INO_INVALID_DATA | 861c341b77STrond Myklebust NFS_INO_REVAL_FORCED; 87311324adSTrond Myklebust list_add(&ctx->list, &nfsi->open_files); 88311324adSTrond Myklebust spin_unlock(&dir->i_lock); 89480c2006SBryan Schumaker return ctx; 90480c2006SBryan Schumaker } 910c030806STrond Myklebust return ERR_PTR(-ENOMEM); 920c030806STrond Myklebust } 93480c2006SBryan Schumaker 94311324adSTrond Myklebust static void put_nfs_open_dir_context(struct inode *dir, struct nfs_open_dir_context *ctx) 95480c2006SBryan Schumaker { 96311324adSTrond Myklebust spin_lock(&dir->i_lock); 97311324adSTrond Myklebust list_del(&ctx->list); 98311324adSTrond Myklebust spin_unlock(&dir->i_lock); 99684f39b4SNeilBrown put_cred(ctx->cred); 100480c2006SBryan Schumaker kfree(ctx); 101480c2006SBryan Schumaker } 102480c2006SBryan Schumaker 1031da177e4SLinus Torvalds /* 1041da177e4SLinus Torvalds * Open file 1051da177e4SLinus Torvalds */ 1061da177e4SLinus Torvalds static int 1071da177e4SLinus Torvalds nfs_opendir(struct inode *inode, struct file *filp) 1081da177e4SLinus Torvalds { 109480c2006SBryan Schumaker int res = 0; 110480c2006SBryan Schumaker struct nfs_open_dir_context *ctx; 1111da177e4SLinus Torvalds 1126de1472fSAl Viro dfprintk(FILE, "NFS: open dir(%pD2)\n", filp); 113cc0dd2d1SChuck Lever 114cc0dd2d1SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSOPEN); 1151e7cb3dcSChuck Lever 116684f39b4SNeilBrown ctx = alloc_nfs_open_dir_context(inode, current_cred()); 117480c2006SBryan Schumaker if (IS_ERR(ctx)) { 118480c2006SBryan Schumaker res = PTR_ERR(ctx); 119480c2006SBryan Schumaker goto out; 120480c2006SBryan Schumaker } 121480c2006SBryan Schumaker filp->private_data = ctx; 122480c2006SBryan Schumaker out: 1231da177e4SLinus Torvalds return res; 1241da177e4SLinus Torvalds } 1251da177e4SLinus Torvalds 126480c2006SBryan Schumaker static int 127480c2006SBryan Schumaker nfs_closedir(struct inode *inode, struct file *filp) 128480c2006SBryan Schumaker { 129a455589fSAl Viro put_nfs_open_dir_context(file_inode(filp), filp->private_data); 130480c2006SBryan Schumaker return 0; 131480c2006SBryan Schumaker } 132480c2006SBryan Schumaker 133d1bacf9eSBryan Schumaker struct nfs_cache_array_entry { 134d1bacf9eSBryan Schumaker u64 cookie; 135d1bacf9eSBryan Schumaker u64 ino; 136a52a8a6aSTrond Myklebust const char *name; 137a52a8a6aSTrond Myklebust unsigned int name_len; 1380b26a0bfSTrond Myklebust unsigned char d_type; 139d1bacf9eSBryan Schumaker }; 140d1bacf9eSBryan Schumaker 141d1bacf9eSBryan Schumaker struct nfs_cache_array { 142d1bacf9eSBryan Schumaker u64 last_cookie; 143b1e21c97STrond Myklebust unsigned int size; 144b1e21c97STrond Myklebust unsigned char page_full : 1, 145b1e21c97STrond Myklebust page_is_eof : 1; 1465601cda8SGustavo A. R. Silva struct nfs_cache_array_entry array[]; 147d1bacf9eSBryan Schumaker }; 148d1bacf9eSBryan Schumaker 1492e7a4641STrond Myklebust typedef struct nfs_readdir_descriptor { 1501da177e4SLinus Torvalds struct file *file; 1511da177e4SLinus Torvalds struct page *page; 15223db8620SAl Viro struct dir_context *ctx; 1531f1d4aa4STrond Myklebust pgoff_t page_index; 1542e7a4641STrond Myklebust u64 dir_cookie; 1550aded708STrond Myklebust u64 last_cookie; 1562e7a4641STrond Myklebust u64 dup_cookie; 157f0dd2136STrond Myklebust loff_t current_index; 15859e356a9STrond Myklebust loff_t prev_index; 159d1bacf9eSBryan Schumaker 160a1147b82STrond Myklebust unsigned long dir_verifier; 1611f4eab7eSNeil Brown unsigned long timestamp; 1624704f0e2STrond Myklebust unsigned long gencount; 1632e7a4641STrond Myklebust unsigned long attr_gencount; 164d1bacf9eSBryan Schumaker unsigned int cache_entry_index; 1652e7a4641STrond Myklebust signed char duped; 166a7a3b1e9SBenjamin Coddington bool plus; 167a7a3b1e9SBenjamin Coddington bool eof; 1681da177e4SLinus Torvalds } nfs_readdir_descriptor_t; 1691da177e4SLinus Torvalds 1701f1d4aa4STrond Myklebust static void nfs_readdir_array_init(struct nfs_cache_array *array) 1711f1d4aa4STrond Myklebust { 1721f1d4aa4STrond Myklebust memset(array, 0, sizeof(struct nfs_cache_array)); 1731f1d4aa4STrond Myklebust } 1741f1d4aa4STrond Myklebust 1751f1d4aa4STrond Myklebust static void nfs_readdir_page_init_array(struct page *page, u64 last_cookie) 1764b310319STrond Myklebust { 1774b310319STrond Myklebust struct nfs_cache_array *array; 1784b310319STrond Myklebust 1794b310319STrond Myklebust array = kmap_atomic(page); 1801f1d4aa4STrond Myklebust nfs_readdir_array_init(array); 1811f1d4aa4STrond Myklebust array->last_cookie = last_cookie; 1824b310319STrond Myklebust kunmap_atomic(array); 1834b310319STrond Myklebust } 1844b310319STrond Myklebust 185d1bacf9eSBryan Schumaker /* 186d1bacf9eSBryan Schumaker * we are freeing strings created by nfs_add_to_readdir_array() 187d1bacf9eSBryan Schumaker */ 188d1bacf9eSBryan Schumaker static 18911de3b11STrond Myklebust void nfs_readdir_clear_array(struct page *page) 190d1bacf9eSBryan Schumaker { 19111de3b11STrond Myklebust struct nfs_cache_array *array; 192d1bacf9eSBryan Schumaker int i; 1938cd51a0cSTrond Myklebust 1942b86ce2dSCong Wang array = kmap_atomic(page); 195d1bacf9eSBryan Schumaker for (i = 0; i < array->size; i++) 196a52a8a6aSTrond Myklebust kfree(array->array[i].name); 1971f1d4aa4STrond Myklebust nfs_readdir_array_init(array); 1982b86ce2dSCong Wang kunmap_atomic(array); 199d1bacf9eSBryan Schumaker } 200d1bacf9eSBryan Schumaker 201b1e21c97STrond Myklebust static void nfs_readdir_array_set_eof(struct nfs_cache_array *array) 202b1e21c97STrond Myklebust { 203b1e21c97STrond Myklebust array->page_is_eof = 1; 204b1e21c97STrond Myklebust array->page_full = 1; 205b1e21c97STrond Myklebust } 206b1e21c97STrond Myklebust 207b1e21c97STrond Myklebust static bool nfs_readdir_array_is_full(struct nfs_cache_array *array) 208b1e21c97STrond Myklebust { 209b1e21c97STrond Myklebust return array->page_full; 210b1e21c97STrond Myklebust } 211b1e21c97STrond Myklebust 212d1bacf9eSBryan Schumaker /* 213d1bacf9eSBryan Schumaker * the caller is responsible for freeing qstr.name 214d1bacf9eSBryan Schumaker * when called by nfs_readdir_add_to_array, the strings will be freed in 215d1bacf9eSBryan Schumaker * nfs_clear_readdir_array() 216d1bacf9eSBryan Schumaker */ 217a52a8a6aSTrond Myklebust static const char *nfs_readdir_copy_name(const char *name, unsigned int len) 218d1bacf9eSBryan Schumaker { 219a52a8a6aSTrond Myklebust const char *ret = kmemdup_nul(name, len, GFP_KERNEL); 220a52a8a6aSTrond Myklebust 22104e4bd1cSCatalin Marinas /* 22204e4bd1cSCatalin Marinas * Avoid a kmemleak false positive. The pointer to the name is stored 22304e4bd1cSCatalin Marinas * in a page cache page which kmemleak does not scan. 22404e4bd1cSCatalin Marinas */ 225a52a8a6aSTrond Myklebust if (ret != NULL) 226a52a8a6aSTrond Myklebust kmemleak_not_leak(ret); 227a52a8a6aSTrond Myklebust return ret; 228d1bacf9eSBryan Schumaker } 229d1bacf9eSBryan Schumaker 230b1e21c97STrond Myklebust /* 231b1e21c97STrond Myklebust * Check that the next array entry lies entirely within the page bounds 232b1e21c97STrond Myklebust */ 233b1e21c97STrond Myklebust static int nfs_readdir_array_can_expand(struct nfs_cache_array *array) 234b1e21c97STrond Myklebust { 235b1e21c97STrond Myklebust struct nfs_cache_array_entry *cache_entry; 236b1e21c97STrond Myklebust 237b1e21c97STrond Myklebust if (array->page_full) 238b1e21c97STrond Myklebust return -ENOSPC; 239b1e21c97STrond Myklebust cache_entry = &array->array[array->size + 1]; 240b1e21c97STrond Myklebust if ((char *)cache_entry - (char *)array > PAGE_SIZE) { 241b1e21c97STrond Myklebust array->page_full = 1; 242b1e21c97STrond Myklebust return -ENOSPC; 243b1e21c97STrond Myklebust } 244b1e21c97STrond Myklebust return 0; 245b1e21c97STrond Myklebust } 246b1e21c97STrond Myklebust 247d1bacf9eSBryan Schumaker static 248d1bacf9eSBryan Schumaker int nfs_readdir_add_to_array(struct nfs_entry *entry, struct page *page) 249d1bacf9eSBryan Schumaker { 250a52a8a6aSTrond Myklebust struct nfs_cache_array *array; 2514a201d6eSTrond Myklebust struct nfs_cache_array_entry *cache_entry; 252a52a8a6aSTrond Myklebust const char *name; 2534a201d6eSTrond Myklebust int ret; 2544a201d6eSTrond Myklebust 255a52a8a6aSTrond Myklebust name = nfs_readdir_copy_name(entry->name, entry->len); 256a52a8a6aSTrond Myklebust if (!name) 257a52a8a6aSTrond Myklebust return -ENOMEM; 258a52a8a6aSTrond Myklebust 259a52a8a6aSTrond Myklebust array = kmap_atomic(page); 260b1e21c97STrond Myklebust ret = nfs_readdir_array_can_expand(array); 261a52a8a6aSTrond Myklebust if (ret) { 262a52a8a6aSTrond Myklebust kfree(name); 2633020093fSTrond Myklebust goto out; 264a52a8a6aSTrond Myklebust } 2653020093fSTrond Myklebust 266b1e21c97STrond Myklebust cache_entry = &array->array[array->size]; 2674a201d6eSTrond Myklebust cache_entry->cookie = entry->prev_cookie; 2684a201d6eSTrond Myklebust cache_entry->ino = entry->ino; 2690b26a0bfSTrond Myklebust cache_entry->d_type = entry->d_type; 270a52a8a6aSTrond Myklebust cache_entry->name_len = entry->len; 271a52a8a6aSTrond Myklebust cache_entry->name = name; 272d1bacf9eSBryan Schumaker array->last_cookie = entry->cookie; 2738cd51a0cSTrond Myklebust array->size++; 27447c716cbSTrond Myklebust if (entry->eof != 0) 275b1e21c97STrond Myklebust nfs_readdir_array_set_eof(array); 2764a201d6eSTrond Myklebust out: 277a52a8a6aSTrond Myklebust kunmap_atomic(array); 2784a201d6eSTrond Myklebust return ret; 279d1bacf9eSBryan Schumaker } 280d1bacf9eSBryan Schumaker 2811f1d4aa4STrond Myklebust static struct page *nfs_readdir_page_get_locked(struct address_space *mapping, 2821f1d4aa4STrond Myklebust pgoff_t index, u64 last_cookie) 2831f1d4aa4STrond Myklebust { 2841f1d4aa4STrond Myklebust struct page *page; 2851f1d4aa4STrond Myklebust 2861f1d4aa4STrond Myklebust page = grab_cache_page(mapping, index); 2871f1d4aa4STrond Myklebust if (page && !PageUptodate(page)) { 2881f1d4aa4STrond Myklebust nfs_readdir_page_init_array(page, last_cookie); 2891f1d4aa4STrond Myklebust if (invalidate_inode_pages2_range(mapping, index + 1, -1) < 0) 2901f1d4aa4STrond Myklebust nfs_zap_mapping(mapping->host, mapping); 2911f1d4aa4STrond Myklebust SetPageUptodate(page); 2921f1d4aa4STrond Myklebust } 2931f1d4aa4STrond Myklebust 2941f1d4aa4STrond Myklebust return page; 2951f1d4aa4STrond Myklebust } 2961f1d4aa4STrond Myklebust 2971f1d4aa4STrond Myklebust static u64 nfs_readdir_page_last_cookie(struct page *page) 2981f1d4aa4STrond Myklebust { 2991f1d4aa4STrond Myklebust struct nfs_cache_array *array; 3001f1d4aa4STrond Myklebust u64 ret; 3011f1d4aa4STrond Myklebust 3021f1d4aa4STrond Myklebust array = kmap_atomic(page); 3031f1d4aa4STrond Myklebust ret = array->last_cookie; 3041f1d4aa4STrond Myklebust kunmap_atomic(array); 3051f1d4aa4STrond Myklebust return ret; 3061f1d4aa4STrond Myklebust } 3071f1d4aa4STrond Myklebust 3081f1d4aa4STrond Myklebust static bool nfs_readdir_page_needs_filling(struct page *page) 3091f1d4aa4STrond Myklebust { 3101f1d4aa4STrond Myklebust struct nfs_cache_array *array; 3111f1d4aa4STrond Myklebust bool ret; 3121f1d4aa4STrond Myklebust 3131f1d4aa4STrond Myklebust array = kmap_atomic(page); 3141f1d4aa4STrond Myklebust ret = !nfs_readdir_array_is_full(array); 3151f1d4aa4STrond Myklebust kunmap_atomic(array); 3161f1d4aa4STrond Myklebust return ret; 3171f1d4aa4STrond Myklebust } 3181f1d4aa4STrond Myklebust 319b1e21c97STrond Myklebust static void nfs_readdir_page_set_eof(struct page *page) 320b1e21c97STrond Myklebust { 321b1e21c97STrond Myklebust struct nfs_cache_array *array; 322b1e21c97STrond Myklebust 323b1e21c97STrond Myklebust array = kmap_atomic(page); 324b1e21c97STrond Myklebust nfs_readdir_array_set_eof(array); 325b1e21c97STrond Myklebust kunmap_atomic(array); 326b1e21c97STrond Myklebust } 327b1e21c97STrond Myklebust 3283b2a09f1STrond Myklebust static void nfs_readdir_page_unlock_and_put(struct page *page) 3293b2a09f1STrond Myklebust { 3303b2a09f1STrond Myklebust unlock_page(page); 3313b2a09f1STrond Myklebust put_page(page); 3323b2a09f1STrond Myklebust } 3333b2a09f1STrond Myklebust 3343b2a09f1STrond Myklebust static struct page *nfs_readdir_page_get_next(struct address_space *mapping, 3353b2a09f1STrond Myklebust pgoff_t index, u64 cookie) 3363b2a09f1STrond Myklebust { 3373b2a09f1STrond Myklebust struct page *page; 3383b2a09f1STrond Myklebust 3393b2a09f1STrond Myklebust page = nfs_readdir_page_get_locked(mapping, index, cookie); 3403b2a09f1STrond Myklebust if (page) { 3413b2a09f1STrond Myklebust if (nfs_readdir_page_last_cookie(page) == cookie) 3423b2a09f1STrond Myklebust return page; 3433b2a09f1STrond Myklebust nfs_readdir_page_unlock_and_put(page); 3443b2a09f1STrond Myklebust } 3453b2a09f1STrond Myklebust return NULL; 3463b2a09f1STrond Myklebust } 3473b2a09f1STrond Myklebust 34859e356a9STrond Myklebust static inline 34959e356a9STrond Myklebust int is_32bit_api(void) 35059e356a9STrond Myklebust { 35159e356a9STrond Myklebust #ifdef CONFIG_COMPAT 35259e356a9STrond Myklebust return in_compat_syscall(); 35359e356a9STrond Myklebust #else 35459e356a9STrond Myklebust return (BITS_PER_LONG == 32); 35559e356a9STrond Myklebust #endif 35659e356a9STrond Myklebust } 35759e356a9STrond Myklebust 35859e356a9STrond Myklebust static 35959e356a9STrond Myklebust bool nfs_readdir_use_cookie(const struct file *filp) 36059e356a9STrond Myklebust { 36159e356a9STrond Myklebust if ((filp->f_mode & FMODE_32BITHASH) || 36259e356a9STrond Myklebust (!(filp->f_mode & FMODE_64BITHASH) && is_32bit_api())) 36359e356a9STrond Myklebust return false; 36459e356a9STrond Myklebust return true; 36559e356a9STrond Myklebust } 36659e356a9STrond Myklebust 367d1bacf9eSBryan Schumaker static 368d1bacf9eSBryan Schumaker int nfs_readdir_search_for_pos(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) 369d1bacf9eSBryan Schumaker { 37023db8620SAl Viro loff_t diff = desc->ctx->pos - desc->current_index; 371d1bacf9eSBryan Schumaker unsigned int index; 372d1bacf9eSBryan Schumaker 373d1bacf9eSBryan Schumaker if (diff < 0) 374d1bacf9eSBryan Schumaker goto out_eof; 375d1bacf9eSBryan Schumaker if (diff >= array->size) { 376b1e21c97STrond Myklebust if (array->page_is_eof) 377d1bacf9eSBryan Schumaker goto out_eof; 378d1bacf9eSBryan Schumaker return -EAGAIN; 379d1bacf9eSBryan Schumaker } 380d1bacf9eSBryan Schumaker 381d1bacf9eSBryan Schumaker index = (unsigned int)diff; 3822e7a4641STrond Myklebust desc->dir_cookie = array->array[index].cookie; 383d1bacf9eSBryan Schumaker desc->cache_entry_index = index; 384d1bacf9eSBryan Schumaker return 0; 385d1bacf9eSBryan Schumaker out_eof: 3866089dd0dSThomas Meyer desc->eof = true; 387d1bacf9eSBryan Schumaker return -EBADCOOKIE; 388d1bacf9eSBryan Schumaker } 389d1bacf9eSBryan Schumaker 3904db72b40SJeff Layton static bool 3914db72b40SJeff Layton nfs_readdir_inode_mapping_valid(struct nfs_inode *nfsi) 3924db72b40SJeff Layton { 3934db72b40SJeff Layton if (nfsi->cache_validity & (NFS_INO_INVALID_ATTR|NFS_INO_INVALID_DATA)) 3944db72b40SJeff Layton return false; 3954db72b40SJeff Layton smp_rmb(); 3964db72b40SJeff Layton return !test_bit(NFS_INO_INVALIDATING, &nfsi->flags); 3974db72b40SJeff Layton } 3984db72b40SJeff Layton 399d1bacf9eSBryan Schumaker static 400d1bacf9eSBryan Schumaker int nfs_readdir_search_for_cookie(struct nfs_cache_array *array, nfs_readdir_descriptor_t *desc) 401d1bacf9eSBryan Schumaker { 402d1bacf9eSBryan Schumaker int i; 4038ef2ce3eSBryan Schumaker loff_t new_pos; 404d1bacf9eSBryan Schumaker int status = -EAGAIN; 405d1bacf9eSBryan Schumaker 406d1bacf9eSBryan Schumaker for (i = 0; i < array->size; i++) { 4072e7a4641STrond Myklebust if (array->array[i].cookie == desc->dir_cookie) { 408496ad9aaSAl Viro struct nfs_inode *nfsi = NFS_I(file_inode(desc->file)); 4090c030806STrond Myklebust 4108ef2ce3eSBryan Schumaker new_pos = desc->current_index + i; 4112e7a4641STrond Myklebust if (desc->attr_gencount != nfsi->attr_gencount || 4124db72b40SJeff Layton !nfs_readdir_inode_mapping_valid(nfsi)) { 4132e7a4641STrond Myklebust desc->duped = 0; 4142e7a4641STrond Myklebust desc->attr_gencount = nfsi->attr_gencount; 41559e356a9STrond Myklebust } else if (new_pos < desc->prev_index) { 4162e7a4641STrond Myklebust if (desc->duped > 0 4172e7a4641STrond Myklebust && desc->dup_cookie == desc->dir_cookie) { 4180c030806STrond Myklebust if (printk_ratelimit()) { 4196de1472fSAl Viro pr_notice("NFS: directory %pD2 contains a readdir loop." 4200c030806STrond Myklebust "Please contact your server vendor. " 421a52a8a6aSTrond Myklebust "The file: %s has duplicate cookie %llu\n", 422a52a8a6aSTrond Myklebust desc->file, array->array[i].name, desc->dir_cookie); 4230c030806STrond Myklebust } 4240c030806STrond Myklebust status = -ELOOP; 4250c030806STrond Myklebust goto out; 4260c030806STrond Myklebust } 4272e7a4641STrond Myklebust desc->dup_cookie = desc->dir_cookie; 4282e7a4641STrond Myklebust desc->duped = -1; 4298ef2ce3eSBryan Schumaker } 43059e356a9STrond Myklebust if (nfs_readdir_use_cookie(desc->file)) 4312e7a4641STrond Myklebust desc->ctx->pos = desc->dir_cookie; 43259e356a9STrond Myklebust else 43323db8620SAl Viro desc->ctx->pos = new_pos; 43459e356a9STrond Myklebust desc->prev_index = new_pos; 4358cd51a0cSTrond Myklebust desc->cache_entry_index = i; 43647c716cbSTrond Myklebust return 0; 4378cd51a0cSTrond Myklebust } 4388cd51a0cSTrond Myklebust } 439b1e21c97STrond Myklebust if (array->page_is_eof) { 440d1bacf9eSBryan Schumaker status = -EBADCOOKIE; 4412e7a4641STrond Myklebust if (desc->dir_cookie == array->last_cookie) 4426089dd0dSThomas Meyer desc->eof = true; 443d1bacf9eSBryan Schumaker } 4440c030806STrond Myklebust out: 445d1bacf9eSBryan Schumaker return status; 446d1bacf9eSBryan Schumaker } 447d1bacf9eSBryan Schumaker 448d1bacf9eSBryan Schumaker static 449d1bacf9eSBryan Schumaker int nfs_readdir_search_array(nfs_readdir_descriptor_t *desc) 450d1bacf9eSBryan Schumaker { 451d1bacf9eSBryan Schumaker struct nfs_cache_array *array; 45247c716cbSTrond Myklebust int status; 453d1bacf9eSBryan Schumaker 454ed09222dSTrond Myklebust array = kmap_atomic(desc->page); 455d1bacf9eSBryan Schumaker 4562e7a4641STrond Myklebust if (desc->dir_cookie == 0) 457d1bacf9eSBryan Schumaker status = nfs_readdir_search_for_pos(array, desc); 458d1bacf9eSBryan Schumaker else 459d1bacf9eSBryan Schumaker status = nfs_readdir_search_for_cookie(array, desc); 460d1bacf9eSBryan Schumaker 46147c716cbSTrond Myklebust if (status == -EAGAIN) { 4620aded708STrond Myklebust desc->last_cookie = array->last_cookie; 463e47c085aSTrond Myklebust desc->current_index += array->size; 46447c716cbSTrond Myklebust desc->page_index++; 46547c716cbSTrond Myklebust } 466ed09222dSTrond Myklebust kunmap_atomic(array); 467d1bacf9eSBryan Schumaker return status; 468d1bacf9eSBryan Schumaker } 469d1bacf9eSBryan Schumaker 470d1bacf9eSBryan Schumaker /* Fill a page with xdr information before transferring to the cache page */ 471d1bacf9eSBryan Schumaker static 47256e4ebf8SBryan Schumaker int nfs_readdir_xdr_filler(struct page **pages, nfs_readdir_descriptor_t *desc, 473d1bacf9eSBryan Schumaker struct nfs_entry *entry, struct file *file, struct inode *inode) 474d1bacf9eSBryan Schumaker { 475480c2006SBryan Schumaker struct nfs_open_dir_context *ctx = file->private_data; 476684f39b4SNeilBrown const struct cred *cred = ctx->cred; 4774704f0e2STrond Myklebust unsigned long timestamp, gencount; 4781da177e4SLinus Torvalds int error; 4791da177e4SLinus Torvalds 4801da177e4SLinus Torvalds again: 4811da177e4SLinus Torvalds timestamp = jiffies; 4824704f0e2STrond Myklebust gencount = nfs_inc_attr_generation_counter(); 483a1147b82STrond Myklebust desc->dir_verifier = nfs_save_change_attribute(inode); 484be62a1a8SMiklos Szeredi error = NFS_PROTO(inode)->readdir(file_dentry(file), cred, entry->cookie, pages, 4851da177e4SLinus Torvalds NFS_SERVER(inode)->dtsize, desc->plus); 4861da177e4SLinus Torvalds if (error < 0) { 4871da177e4SLinus Torvalds /* We requested READDIRPLUS, but the server doesn't grok it */ 4881da177e4SLinus Torvalds if (error == -ENOTSUPP && desc->plus) { 4891da177e4SLinus Torvalds NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; 4903a10c30aSBenny Halevy clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); 491a7a3b1e9SBenjamin Coddington desc->plus = false; 4921da177e4SLinus Torvalds goto again; 4931da177e4SLinus Torvalds } 4941da177e4SLinus Torvalds goto error; 4951da177e4SLinus Torvalds } 4961f4eab7eSNeil Brown desc->timestamp = timestamp; 4974704f0e2STrond Myklebust desc->gencount = gencount; 498d1bacf9eSBryan Schumaker error: 499d1bacf9eSBryan Schumaker return error; 500d1bacf9eSBryan Schumaker } 501d1bacf9eSBryan Schumaker 502573c4e1eSChuck Lever static int xdr_decode(nfs_readdir_descriptor_t *desc, 503573c4e1eSChuck Lever struct nfs_entry *entry, struct xdr_stream *xdr) 504d1bacf9eSBryan Schumaker { 50559e356a9STrond Myklebust struct inode *inode = file_inode(desc->file); 506573c4e1eSChuck Lever int error; 507d1bacf9eSBryan Schumaker 50859e356a9STrond Myklebust error = NFS_PROTO(inode)->decode_dirent(xdr, entry, desc->plus); 509573c4e1eSChuck Lever if (error) 510573c4e1eSChuck Lever return error; 511d1bacf9eSBryan Schumaker entry->fattr->time_start = desc->timestamp; 512d1bacf9eSBryan Schumaker entry->fattr->gencount = desc->gencount; 513d1bacf9eSBryan Schumaker return 0; 514d1bacf9eSBryan Schumaker } 515d1bacf9eSBryan Schumaker 516fa923369STrond Myklebust /* Match file and dirent using either filehandle or fileid 517fa923369STrond Myklebust * Note: caller is responsible for checking the fsid 518fa923369STrond Myklebust */ 519d39ab9deSBryan Schumaker static 520d39ab9deSBryan Schumaker int nfs_same_file(struct dentry *dentry, struct nfs_entry *entry) 521d39ab9deSBryan Schumaker { 522d8fdb47fSTrond Myklebust struct inode *inode; 523fa923369STrond Myklebust struct nfs_inode *nfsi; 524fa923369STrond Myklebust 5252b0143b5SDavid Howells if (d_really_is_negative(dentry)) 5262b0143b5SDavid Howells return 0; 527fa923369STrond Myklebust 528d8fdb47fSTrond Myklebust inode = d_inode(dentry); 529d8fdb47fSTrond Myklebust if (is_bad_inode(inode) || NFS_STALE(inode)) 530d8fdb47fSTrond Myklebust return 0; 531d8fdb47fSTrond Myklebust 532d8fdb47fSTrond Myklebust nfsi = NFS_I(inode); 5337dc72d5fSTrond Myklebust if (entry->fattr->fileid != nfsi->fileid) 534d39ab9deSBryan Schumaker return 0; 5357dc72d5fSTrond Myklebust if (entry->fh->size && nfs_compare_fh(entry->fh, &nfsi->fh) != 0) 5367dc72d5fSTrond Myklebust return 0; 5377dc72d5fSTrond Myklebust return 1; 538d39ab9deSBryan Schumaker } 539d39ab9deSBryan Schumaker 540d39ab9deSBryan Schumaker static 54123db8620SAl Viro bool nfs_use_readdirplus(struct inode *dir, struct dir_context *ctx) 542d69ee9b8STrond Myklebust { 543d69ee9b8STrond Myklebust if (!nfs_server_capable(dir, NFS_CAP_READDIRPLUS)) 544d69ee9b8STrond Myklebust return false; 545d69ee9b8STrond Myklebust if (test_and_clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(dir)->flags)) 546d69ee9b8STrond Myklebust return true; 54723db8620SAl Viro if (ctx->pos == 0) 548d69ee9b8STrond Myklebust return true; 549d69ee9b8STrond Myklebust return false; 550d69ee9b8STrond Myklebust } 551d69ee9b8STrond Myklebust 552d69ee9b8STrond Myklebust /* 55363519fbcSTrond Myklebust * This function is called by the lookup and getattr code to request the 55463519fbcSTrond Myklebust * use of readdirplus to accelerate any future lookups in the same 555d69ee9b8STrond Myklebust * directory. 556d69ee9b8STrond Myklebust */ 557d69ee9b8STrond Myklebust void nfs_advise_use_readdirplus(struct inode *dir) 558d69ee9b8STrond Myklebust { 55963519fbcSTrond Myklebust struct nfs_inode *nfsi = NFS_I(dir); 56063519fbcSTrond Myklebust 56163519fbcSTrond Myklebust if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) && 56263519fbcSTrond Myklebust !list_empty(&nfsi->open_files)) 56363519fbcSTrond Myklebust set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); 564d69ee9b8STrond Myklebust } 565d69ee9b8STrond Myklebust 566311324adSTrond Myklebust /* 567311324adSTrond Myklebust * This function is mainly for use by nfs_getattr(). 568311324adSTrond Myklebust * 569311324adSTrond Myklebust * If this is an 'ls -l', we want to force use of readdirplus. 570311324adSTrond Myklebust * Do this by checking if there is an active file descriptor 571311324adSTrond Myklebust * and calling nfs_advise_use_readdirplus, then forcing a 572311324adSTrond Myklebust * cache flush. 573311324adSTrond Myklebust */ 574311324adSTrond Myklebust void nfs_force_use_readdirplus(struct inode *dir) 575311324adSTrond Myklebust { 57663519fbcSTrond Myklebust struct nfs_inode *nfsi = NFS_I(dir); 57763519fbcSTrond Myklebust 57863519fbcSTrond Myklebust if (nfs_server_capable(dir, NFS_CAP_READDIRPLUS) && 57963519fbcSTrond Myklebust !list_empty(&nfsi->open_files)) { 58063519fbcSTrond Myklebust set_bit(NFS_INO_ADVISE_RDPLUS, &nfsi->flags); 581227823d2SDai Ngo invalidate_mapping_pages(dir->i_mapping, 582227823d2SDai Ngo nfsi->page_index + 1, -1); 583311324adSTrond Myklebust } 584311324adSTrond Myklebust } 585311324adSTrond Myklebust 586d69ee9b8STrond Myklebust static 587a1147b82STrond Myklebust void nfs_prime_dcache(struct dentry *parent, struct nfs_entry *entry, 588a1147b82STrond Myklebust unsigned long dir_verifier) 589d39ab9deSBryan Schumaker { 59026fe5750SLinus Torvalds struct qstr filename = QSTR_INIT(entry->name, entry->len); 5919ac3d3e8SAl Viro DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); 5924a201d6eSTrond Myklebust struct dentry *dentry; 5934a201d6eSTrond Myklebust struct dentry *alias; 594d39ab9deSBryan Schumaker struct inode *inode; 595aa9c2669SDavid Quigley int status; 596d39ab9deSBryan Schumaker 597fa923369STrond Myklebust if (!(entry->fattr->valid & NFS_ATTR_FATTR_FILEID)) 598fa923369STrond Myklebust return; 5996c441c25STrond Myklebust if (!(entry->fattr->valid & NFS_ATTR_FATTR_FSID)) 6006c441c25STrond Myklebust return; 60178d04af4STrond Myklebust if (filename.len == 0) 60278d04af4STrond Myklebust return; 60378d04af4STrond Myklebust /* Validate that the name doesn't contain any illegal '\0' */ 60478d04af4STrond Myklebust if (strnlen(filename.name, filename.len) != filename.len) 60578d04af4STrond Myklebust return; 60678d04af4STrond Myklebust /* ...or '/' */ 60778d04af4STrond Myklebust if (strnchr(filename.name, filename.len, '/')) 60878d04af4STrond Myklebust return; 6094a201d6eSTrond Myklebust if (filename.name[0] == '.') { 6104a201d6eSTrond Myklebust if (filename.len == 1) 6114a201d6eSTrond Myklebust return; 6124a201d6eSTrond Myklebust if (filename.len == 2 && filename.name[1] == '.') 6134a201d6eSTrond Myklebust return; 6144a201d6eSTrond Myklebust } 6158387ff25SLinus Torvalds filename.hash = full_name_hash(parent, filename.name, filename.len); 616d39ab9deSBryan Schumaker 6174a201d6eSTrond Myklebust dentry = d_lookup(parent, &filename); 6189ac3d3e8SAl Viro again: 6199ac3d3e8SAl Viro if (!dentry) { 6209ac3d3e8SAl Viro dentry = d_alloc_parallel(parent, &filename, &wq); 6219ac3d3e8SAl Viro if (IS_ERR(dentry)) 6229ac3d3e8SAl Viro return; 6239ac3d3e8SAl Viro } 6249ac3d3e8SAl Viro if (!d_in_lookup(dentry)) { 6256c441c25STrond Myklebust /* Is there a mountpoint here? If so, just exit */ 6266c441c25STrond Myklebust if (!nfs_fsid_equal(&NFS_SB(dentry->d_sb)->fsid, 6276c441c25STrond Myklebust &entry->fattr->fsid)) 6286c441c25STrond Myklebust goto out; 629d39ab9deSBryan Schumaker if (nfs_same_file(dentry, entry)) { 6307dc72d5fSTrond Myklebust if (!entry->fh->size) 6317dc72d5fSTrond Myklebust goto out; 632a1147b82STrond Myklebust nfs_set_verifier(dentry, dir_verifier); 6332b0143b5SDavid Howells status = nfs_refresh_inode(d_inode(dentry), entry->fattr); 634aa9c2669SDavid Quigley if (!status) 6352b0143b5SDavid Howells nfs_setsecurity(d_inode(dentry), entry->fattr, entry->label); 636d39ab9deSBryan Schumaker goto out; 637d39ab9deSBryan Schumaker } else { 6385542aa2fSEric W. Biederman d_invalidate(dentry); 639d39ab9deSBryan Schumaker dput(dentry); 6409ac3d3e8SAl Viro dentry = NULL; 6419ac3d3e8SAl Viro goto again; 642d39ab9deSBryan Schumaker } 643d39ab9deSBryan Schumaker } 6447dc72d5fSTrond Myklebust if (!entry->fh->size) { 6457dc72d5fSTrond Myklebust d_lookup_done(dentry); 6467dc72d5fSTrond Myklebust goto out; 6477dc72d5fSTrond Myklebust } 648d39ab9deSBryan Schumaker 6491775fd3eSDavid Quigley inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr, entry->label); 65041d28bcaSAl Viro alias = d_splice_alias(inode, dentry); 6519ac3d3e8SAl Viro d_lookup_done(dentry); 6529ac3d3e8SAl Viro if (alias) { 653d39ab9deSBryan Schumaker if (IS_ERR(alias)) 654d39ab9deSBryan Schumaker goto out; 6559ac3d3e8SAl Viro dput(dentry); 6569ac3d3e8SAl Viro dentry = alias; 6579ac3d3e8SAl Viro } 658a1147b82STrond Myklebust nfs_set_verifier(dentry, dir_verifier); 659d39ab9deSBryan Schumaker out: 660d39ab9deSBryan Schumaker dput(dentry); 661d39ab9deSBryan Schumaker } 662d39ab9deSBryan Schumaker 663d1bacf9eSBryan Schumaker /* Perform conversion from xdr to cache array */ 6643b2a09f1STrond Myklebust static int nfs_readdir_page_filler(struct nfs_readdir_descriptor *desc, 6653b2a09f1STrond Myklebust struct nfs_entry *entry, 6663b2a09f1STrond Myklebust struct page **xdr_pages, 6673b2a09f1STrond Myklebust struct page *fillme, unsigned int buflen) 668d1bacf9eSBryan Schumaker { 6693b2a09f1STrond Myklebust struct address_space *mapping = desc->file->f_mapping; 670babddc72SBryan Schumaker struct xdr_stream stream; 671f7da7a12SBenny Halevy struct xdr_buf buf; 6723b2a09f1STrond Myklebust struct page *scratch, *new, *page = fillme; 6735c346854STrond Myklebust int status; 674babddc72SBryan Schumaker 6756650239aSTrond Myklebust scratch = alloc_page(GFP_KERNEL); 6766650239aSTrond Myklebust if (scratch == NULL) 6776650239aSTrond Myklebust return -ENOMEM; 678babddc72SBryan Schumaker 679f7da7a12SBenny Halevy xdr_init_decode_pages(&stream, &buf, xdr_pages, buflen); 6806650239aSTrond Myklebust xdr_set_scratch_buffer(&stream, page_address(scratch), PAGE_SIZE); 68199424380SBryan Schumaker 68299424380SBryan Schumaker do { 683d33030e2SJeffrey Mitchell if (entry->label) 684d33030e2SJeffrey Mitchell entry->label->len = NFS4_MAXLABELLEN; 685d33030e2SJeffrey Mitchell 68699424380SBryan Schumaker status = xdr_decode(desc, entry, &stream); 687972bcdf2STrond Myklebust if (status != 0) 68899424380SBryan Schumaker break; 6895c346854STrond Myklebust 690a7a3b1e9SBenjamin Coddington if (desc->plus) 691a1147b82STrond Myklebust nfs_prime_dcache(file_dentry(desc->file), entry, 692a1147b82STrond Myklebust desc->dir_verifier); 6938cd51a0cSTrond Myklebust 694db531db9SMax Kellermann status = nfs_readdir_add_to_array(entry, page); 6953b2a09f1STrond Myklebust if (status != -ENOSPC) 6963b2a09f1STrond Myklebust continue; 6973b2a09f1STrond Myklebust 6983b2a09f1STrond Myklebust if (page->mapping != mapping) 6993b2a09f1STrond Myklebust break; 7003b2a09f1STrond Myklebust new = nfs_readdir_page_get_next(mapping, page->index + 1, 7013b2a09f1STrond Myklebust entry->prev_cookie); 7023b2a09f1STrond Myklebust if (!new) 7033b2a09f1STrond Myklebust break; 7043b2a09f1STrond Myklebust if (page != fillme) 7053b2a09f1STrond Myklebust nfs_readdir_page_unlock_and_put(page); 7063b2a09f1STrond Myklebust page = new; 7073b2a09f1STrond Myklebust status = nfs_readdir_add_to_array(entry, page); 708972bcdf2STrond Myklebust } while (!status && !entry->eof); 70999424380SBryan Schumaker 710972bcdf2STrond Myklebust switch (status) { 711972bcdf2STrond Myklebust case -EBADCOOKIE: 712972bcdf2STrond Myklebust if (entry->eof) { 713b1e21c97STrond Myklebust nfs_readdir_page_set_eof(page); 71499424380SBryan Schumaker status = 0; 71556e4ebf8SBryan Schumaker } 716972bcdf2STrond Myklebust break; 717972bcdf2STrond Myklebust case -ENOSPC: 718972bcdf2STrond Myklebust case -EAGAIN: 719972bcdf2STrond Myklebust status = 0; 720972bcdf2STrond Myklebust break; 721972bcdf2STrond Myklebust } 7226650239aSTrond Myklebust 7233b2a09f1STrond Myklebust if (page != fillme) 7243b2a09f1STrond Myklebust nfs_readdir_page_unlock_and_put(page); 7253b2a09f1STrond Myklebust 7266650239aSTrond Myklebust put_page(scratch); 7278cd51a0cSTrond Myklebust return status; 7288cd51a0cSTrond Myklebust } 72956e4ebf8SBryan Schumaker 730*1a34c8c9STrond Myklebust static void nfs_readdir_free_pages(struct page **pages, size_t npages) 73156e4ebf8SBryan Schumaker { 732*1a34c8c9STrond Myklebust while (npages--) 733*1a34c8c9STrond Myklebust put_page(pages[npages]); 734*1a34c8c9STrond Myklebust kfree(pages); 73556e4ebf8SBryan Schumaker } 73656e4ebf8SBryan Schumaker 73756e4ebf8SBryan Schumaker /* 738bf211ca1Szhangliguang * nfs_readdir_alloc_pages() will allocate pages that must be freed with a call 739bf211ca1Szhangliguang * to nfs_readdir_free_pages() 74056e4ebf8SBryan Schumaker */ 741*1a34c8c9STrond Myklebust static struct page **nfs_readdir_alloc_pages(size_t npages) 74256e4ebf8SBryan Schumaker { 743*1a34c8c9STrond Myklebust struct page **pages; 744*1a34c8c9STrond Myklebust size_t i; 74556e4ebf8SBryan Schumaker 746*1a34c8c9STrond Myklebust pages = kmalloc_array(npages, sizeof(*pages), GFP_KERNEL); 747*1a34c8c9STrond Myklebust if (!pages) 748*1a34c8c9STrond Myklebust return NULL; 74956e4ebf8SBryan Schumaker for (i = 0; i < npages; i++) { 75056e4ebf8SBryan Schumaker struct page *page = alloc_page(GFP_KERNEL); 75156e4ebf8SBryan Schumaker if (page == NULL) 75256e4ebf8SBryan Schumaker goto out_freepages; 75356e4ebf8SBryan Schumaker pages[i] = page; 75456e4ebf8SBryan Schumaker } 755*1a34c8c9STrond Myklebust return pages; 75656e4ebf8SBryan Schumaker 75756e4ebf8SBryan Schumaker out_freepages: 758c7e9668eSAnna Schumaker nfs_readdir_free_pages(pages, i); 759*1a34c8c9STrond Myklebust return NULL; 760d1bacf9eSBryan Schumaker } 761d1bacf9eSBryan Schumaker 762d1bacf9eSBryan Schumaker static 763d1bacf9eSBryan Schumaker int nfs_readdir_xdr_to_array(nfs_readdir_descriptor_t *desc, struct page *page, struct inode *inode) 764d1bacf9eSBryan Schumaker { 765*1a34c8c9STrond Myklebust struct page **pages; 766d1bacf9eSBryan Schumaker struct nfs_entry entry; 767d1bacf9eSBryan Schumaker struct file *file = desc->file; 768*1a34c8c9STrond Myklebust size_t array_size; 769*1a34c8c9STrond Myklebust size_t dtsize = NFS_SERVER(inode)->dtsize; 7708cd51a0cSTrond Myklebust int status = -ENOMEM; 771d1bacf9eSBryan Schumaker 772d1bacf9eSBryan Schumaker entry.prev_cookie = 0; 7731f1d4aa4STrond Myklebust entry.cookie = nfs_readdir_page_last_cookie(page); 774d1bacf9eSBryan Schumaker entry.eof = 0; 775d1bacf9eSBryan Schumaker entry.fh = nfs_alloc_fhandle(); 776d1bacf9eSBryan Schumaker entry.fattr = nfs_alloc_fattr(); 777573c4e1eSChuck Lever entry.server = NFS_SERVER(inode); 778d1bacf9eSBryan Schumaker if (entry.fh == NULL || entry.fattr == NULL) 779d1bacf9eSBryan Schumaker goto out; 780d1bacf9eSBryan Schumaker 78114c43f76SDavid Quigley entry.label = nfs4_label_alloc(NFS_SERVER(inode), GFP_NOWAIT); 78214c43f76SDavid Quigley if (IS_ERR(entry.label)) { 78314c43f76SDavid Quigley status = PTR_ERR(entry.label); 78414c43f76SDavid Quigley goto out; 78514c43f76SDavid Quigley } 78614c43f76SDavid Quigley 787*1a34c8c9STrond Myklebust array_size = (dtsize + PAGE_SIZE - 1) >> PAGE_SHIFT; 788*1a34c8c9STrond Myklebust pages = nfs_readdir_alloc_pages(array_size); 789*1a34c8c9STrond Myklebust if (!pages) 790e762a639STrond Myklebust goto out_release_label; 791*1a34c8c9STrond Myklebust 792d1bacf9eSBryan Schumaker do { 793ac396128STrond Myklebust unsigned int pglen; 79456e4ebf8SBryan Schumaker status = nfs_readdir_xdr_filler(pages, desc, &entry, file, inode); 795babddc72SBryan Schumaker 796d1bacf9eSBryan Schumaker if (status < 0) 797d1bacf9eSBryan Schumaker break; 798972bcdf2STrond Myklebust 799ac396128STrond Myklebust pglen = status; 800972bcdf2STrond Myklebust if (pglen == 0) { 801972bcdf2STrond Myklebust nfs_readdir_page_set_eof(page); 8028cd51a0cSTrond Myklebust break; 8038cd51a0cSTrond Myklebust } 804972bcdf2STrond Myklebust 805972bcdf2STrond Myklebust status = nfs_readdir_page_filler(desc, &entry, pages, page, pglen); 806e762a639STrond Myklebust } while (!status && nfs_readdir_page_needs_filling(page)); 807d1bacf9eSBryan Schumaker 808c7e9668eSAnna Schumaker nfs_readdir_free_pages(pages, array_size); 809e762a639STrond Myklebust out_release_label: 81014c43f76SDavid Quigley nfs4_label_free(entry.label); 811d1bacf9eSBryan Schumaker out: 812d1bacf9eSBryan Schumaker nfs_free_fattr(entry.fattr); 813d1bacf9eSBryan Schumaker nfs_free_fhandle(entry.fh); 814d1bacf9eSBryan Schumaker return status; 815d1bacf9eSBryan Schumaker } 816d1bacf9eSBryan Schumaker 8171f1d4aa4STrond Myklebust static void nfs_readdir_page_put(struct nfs_readdir_descriptor *desc) 8181da177e4SLinus Torvalds { 81909cbfeafSKirill A. Shutemov put_page(desc->page); 8201da177e4SLinus Torvalds desc->page = NULL; 8211da177e4SLinus Torvalds } 8221da177e4SLinus Torvalds 8231f1d4aa4STrond Myklebust static void 8241f1d4aa4STrond Myklebust nfs_readdir_page_unlock_and_put_cached(struct nfs_readdir_descriptor *desc) 8251da177e4SLinus Torvalds { 8261f1d4aa4STrond Myklebust unlock_page(desc->page); 8271f1d4aa4STrond Myklebust nfs_readdir_page_put(desc); 8281f1d4aa4STrond Myklebust } 8291f1d4aa4STrond Myklebust 8301f1d4aa4STrond Myklebust static struct page * 8311f1d4aa4STrond Myklebust nfs_readdir_page_get_cached(struct nfs_readdir_descriptor *desc) 8321f1d4aa4STrond Myklebust { 8331f1d4aa4STrond Myklebust return nfs_readdir_page_get_locked(desc->file->f_mapping, 8341f1d4aa4STrond Myklebust desc->page_index, 8351f1d4aa4STrond Myklebust desc->last_cookie); 8361da177e4SLinus Torvalds } 8371da177e4SLinus Torvalds 8381da177e4SLinus Torvalds /* 839d1bacf9eSBryan Schumaker * Returns 0 if desc->dir_cookie was found on page desc->page_index 840114de382STrond Myklebust * and locks the page to prevent removal from the page cache. 8411da177e4SLinus Torvalds */ 842d1bacf9eSBryan Schumaker static 843114de382STrond Myklebust int find_and_lock_cache_page(nfs_readdir_descriptor_t *desc) 844d1bacf9eSBryan Schumaker { 845227823d2SDai Ngo struct inode *inode = file_inode(desc->file); 846227823d2SDai Ngo struct nfs_inode *nfsi = NFS_I(inode); 847d1bacf9eSBryan Schumaker int res; 848d1bacf9eSBryan Schumaker 8491f1d4aa4STrond Myklebust desc->page = nfs_readdir_page_get_cached(desc); 8501f1d4aa4STrond Myklebust if (!desc->page) 8511f1d4aa4STrond Myklebust return -ENOMEM; 8521f1d4aa4STrond Myklebust if (nfs_readdir_page_needs_filling(desc->page)) { 8531f1d4aa4STrond Myklebust res = nfs_readdir_xdr_to_array(desc, desc->page, inode); 8541f1d4aa4STrond Myklebust if (res < 0) 855114de382STrond Myklebust goto error; 8561f1d4aa4STrond Myklebust } 857114de382STrond Myklebust res = nfs_readdir_search_array(desc); 858227823d2SDai Ngo if (res == 0) { 859227823d2SDai Ngo nfsi->page_index = desc->page_index; 860114de382STrond Myklebust return 0; 861114de382STrond Myklebust } 862114de382STrond Myklebust error: 8631f1d4aa4STrond Myklebust nfs_readdir_page_unlock_and_put_cached(desc); 864d1bacf9eSBryan Schumaker return res; 865d1bacf9eSBryan Schumaker } 866d1bacf9eSBryan Schumaker 867d1bacf9eSBryan Schumaker /* Search for desc->dir_cookie from the beginning of the page cache */ 8681da177e4SLinus Torvalds static inline 8691da177e4SLinus Torvalds int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) 8701da177e4SLinus Torvalds { 8718cd51a0cSTrond Myklebust int res; 872d1bacf9eSBryan Schumaker 8730aded708STrond Myklebust if (desc->page_index == 0) { 8748cd51a0cSTrond Myklebust desc->current_index = 0; 87559e356a9STrond Myklebust desc->prev_index = 0; 8760aded708STrond Myklebust desc->last_cookie = 0; 8770aded708STrond Myklebust } 87847c716cbSTrond Myklebust do { 879114de382STrond Myklebust res = find_and_lock_cache_page(desc); 88047c716cbSTrond Myklebust } while (res == -EAGAIN); 8811da177e4SLinus Torvalds return res; 8821da177e4SLinus Torvalds } 8831da177e4SLinus Torvalds 8841da177e4SLinus Torvalds /* 8851da177e4SLinus Torvalds * Once we've found the start of the dirent within a page: fill 'er up... 8861da177e4SLinus Torvalds */ 8871da177e4SLinus Torvalds static 88823db8620SAl Viro int nfs_do_filldir(nfs_readdir_descriptor_t *desc) 8891da177e4SLinus Torvalds { 8901da177e4SLinus Torvalds struct file *file = desc->file; 891d1bacf9eSBryan Schumaker int i = 0; 892d1bacf9eSBryan Schumaker int res = 0; 893d1bacf9eSBryan Schumaker struct nfs_cache_array *array = NULL; 8948ef2ce3eSBryan Schumaker 8950795bf83SFabian Frederick array = kmap(desc->page); 896d1bacf9eSBryan Schumaker for (i = desc->cache_entry_index; i < array->size; i++) { 897ece0b423STrond Myklebust struct nfs_cache_array_entry *ent; 8981da177e4SLinus Torvalds 899ece0b423STrond Myklebust ent = &array->array[i]; 900a52a8a6aSTrond Myklebust if (!dir_emit(desc->ctx, ent->name, ent->name_len, 90123db8620SAl Viro nfs_compat_user_ino64(ent->ino), ent->d_type)) { 9026089dd0dSThomas Meyer desc->eof = true; 9031da177e4SLinus Torvalds break; 904ece0b423STrond Myklebust } 905d1bacf9eSBryan Schumaker if (i < (array->size-1)) 9062e7a4641STrond Myklebust desc->dir_cookie = array->array[i+1].cookie; 907d1bacf9eSBryan Schumaker else 9082e7a4641STrond Myklebust desc->dir_cookie = array->last_cookie; 90959e356a9STrond Myklebust if (nfs_readdir_use_cookie(file)) 9102e7a4641STrond Myklebust desc->ctx->pos = desc->dir_cookie; 91159e356a9STrond Myklebust else 91259e356a9STrond Myklebust desc->ctx->pos++; 9132e7a4641STrond Myklebust if (desc->duped != 0) 9142e7a4641STrond Myklebust desc->duped = 1; 9158cd51a0cSTrond Myklebust } 916b1e21c97STrond Myklebust if (array->page_is_eof) 9176089dd0dSThomas Meyer desc->eof = true; 918d1bacf9eSBryan Schumaker 9190795bf83SFabian Frederick kunmap(desc->page); 9201e7cb3dcSChuck Lever dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", 9212e7a4641STrond Myklebust (unsigned long long)desc->dir_cookie, res); 9221da177e4SLinus Torvalds return res; 9231da177e4SLinus Torvalds } 9241da177e4SLinus Torvalds 9251da177e4SLinus Torvalds /* 9261da177e4SLinus Torvalds * If we cannot find a cookie in our cache, we suspect that this is 9271da177e4SLinus Torvalds * because it points to a deleted file, so we ask the server to return 9281da177e4SLinus Torvalds * whatever it thinks is the next entry. We then feed this to filldir. 9291da177e4SLinus Torvalds * If all goes well, we should then be able to find our way round the 9301da177e4SLinus Torvalds * cache on the next call to readdir_search_pagecache(); 9311da177e4SLinus Torvalds * 9321da177e4SLinus Torvalds * NOTE: we cannot add the anonymous page to the pagecache because 9331da177e4SLinus Torvalds * the data it contains might not be page aligned. Besides, 9341da177e4SLinus Torvalds * we should already have a complete representation of the 9351da177e4SLinus Torvalds * directory in the page cache by the time we get here. 9361da177e4SLinus Torvalds */ 9371da177e4SLinus Torvalds static inline 93823db8620SAl Viro int uncached_readdir(nfs_readdir_descriptor_t *desc) 9391da177e4SLinus Torvalds { 9401da177e4SLinus Torvalds struct page *page = NULL; 9411da177e4SLinus Torvalds int status; 942496ad9aaSAl Viro struct inode *inode = file_inode(desc->file); 9431da177e4SLinus Torvalds 9441e7cb3dcSChuck Lever dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", 9452e7a4641STrond Myklebust (unsigned long long)desc->dir_cookie); 9461da177e4SLinus Torvalds 9471da177e4SLinus Torvalds page = alloc_page(GFP_HIGHUSER); 9481da177e4SLinus Torvalds if (!page) { 9491da177e4SLinus Torvalds status = -ENOMEM; 9501da177e4SLinus Torvalds goto out; 9511da177e4SLinus Torvalds } 9521da177e4SLinus Torvalds 9537a8e1dc3STrond Myklebust desc->page_index = 0; 9542e7a4641STrond Myklebust desc->last_cookie = desc->dir_cookie; 9557a8e1dc3STrond Myklebust desc->page = page; 9562e7a4641STrond Myklebust desc->duped = 0; 9577a8e1dc3STrond Myklebust 9581f1d4aa4STrond Myklebust nfs_readdir_page_init_array(page, desc->dir_cookie); 95985f8607eSTrond Myklebust status = nfs_readdir_xdr_to_array(desc, page, inode); 96085f8607eSTrond Myklebust if (status < 0) 961d1bacf9eSBryan Schumaker goto out_release; 962d1bacf9eSBryan Schumaker 96323db8620SAl Viro status = nfs_do_filldir(desc); 9641da177e4SLinus Torvalds 965114de382STrond Myklebust out_release: 966114de382STrond Myklebust nfs_readdir_clear_array(desc->page); 9671f1d4aa4STrond Myklebust nfs_readdir_page_put(desc); 9681da177e4SLinus Torvalds out: 9691e7cb3dcSChuck Lever dfprintk(DIRCACHE, "NFS: %s: returns %d\n", 9703110ff80SHarvey Harrison __func__, status); 9711da177e4SLinus Torvalds return status; 9721da177e4SLinus Torvalds } 9731da177e4SLinus Torvalds 97400a92642SOlivier Galibert /* The file offset position represents the dirent entry number. A 97500a92642SOlivier Galibert last cookie cache takes care of the common case of reading the 97600a92642SOlivier Galibert whole directory. 9771da177e4SLinus Torvalds */ 97823db8620SAl Viro static int nfs_readdir(struct file *file, struct dir_context *ctx) 9791da177e4SLinus Torvalds { 980be62a1a8SMiklos Szeredi struct dentry *dentry = file_dentry(file); 9812b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 98223db8620SAl Viro struct nfs_open_dir_context *dir_ctx = file->private_data; 98359e356a9STrond Myklebust nfs_readdir_descriptor_t my_desc = { 98459e356a9STrond Myklebust .file = file, 98559e356a9STrond Myklebust .ctx = ctx, 98659e356a9STrond Myklebust .plus = nfs_use_readdirplus(inode, ctx), 98759e356a9STrond Myklebust }, 98859e356a9STrond Myklebust *desc = &my_desc; 98907b5ce8eSScott Mayhew int res = 0; 9901da177e4SLinus Torvalds 9916de1472fSAl Viro dfprintk(FILE, "NFS: readdir(%pD2) starting at cookie %llu\n", 9926de1472fSAl Viro file, (long long)ctx->pos); 99391d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); 99491d5b470SChuck Lever 9951da177e4SLinus Torvalds /* 99623db8620SAl Viro * ctx->pos points to the dirent entry number. 997f0dd2136STrond Myklebust * *desc->dir_cookie has the cookie for the next entry. We have 99800a92642SOlivier Galibert * to either find the entry with the appropriate number or 99900a92642SOlivier Galibert * revalidate the cookie. 10001da177e4SLinus Torvalds */ 100179f687a3STrond Myklebust if (ctx->pos == 0 || nfs_attribute_cache_expired(inode)) 100223db8620SAl Viro res = nfs_revalidate_mapping(inode, file->f_mapping); 1003fccca7fcSTrond Myklebust if (res < 0) 1004fccca7fcSTrond Myklebust goto out; 1005fccca7fcSTrond Myklebust 10062e7a4641STrond Myklebust spin_lock(&file->f_lock); 10072e7a4641STrond Myklebust desc->dir_cookie = dir_ctx->dir_cookie; 10082e7a4641STrond Myklebust desc->dup_cookie = dir_ctx->dup_cookie; 10092e7a4641STrond Myklebust desc->duped = dir_ctx->duped; 10102e7a4641STrond Myklebust desc->attr_gencount = dir_ctx->attr_gencount; 10112e7a4641STrond Myklebust spin_unlock(&file->f_lock); 10122e7a4641STrond Myklebust 101347c716cbSTrond Myklebust do { 10141da177e4SLinus Torvalds res = readdir_search_pagecache(desc); 101500a92642SOlivier Galibert 10161da177e4SLinus Torvalds if (res == -EBADCOOKIE) { 1017ece0b423STrond Myklebust res = 0; 10181da177e4SLinus Torvalds /* This means either end of directory */ 10192e7a4641STrond Myklebust if (desc->dir_cookie && !desc->eof) { 10201da177e4SLinus Torvalds /* Or that the server has 'lost' a cookie */ 102123db8620SAl Viro res = uncached_readdir(desc); 1022ece0b423STrond Myklebust if (res == 0) 10231da177e4SLinus Torvalds continue; 10241da177e4SLinus Torvalds } 10251da177e4SLinus Torvalds break; 10261da177e4SLinus Torvalds } 10271da177e4SLinus Torvalds if (res == -ETOOSMALL && desc->plus) { 10283a10c30aSBenny Halevy clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_I(inode)->flags); 10291da177e4SLinus Torvalds nfs_zap_caches(inode); 1030baf57a09STrond Myklebust desc->page_index = 0; 1031a7a3b1e9SBenjamin Coddington desc->plus = false; 1032a7a3b1e9SBenjamin Coddington desc->eof = false; 10331da177e4SLinus Torvalds continue; 10341da177e4SLinus Torvalds } 10351da177e4SLinus Torvalds if (res < 0) 10361da177e4SLinus Torvalds break; 10371da177e4SLinus Torvalds 103823db8620SAl Viro res = nfs_do_filldir(desc); 10391f1d4aa4STrond Myklebust nfs_readdir_page_unlock_and_put_cached(desc); 1040ece0b423STrond Myklebust if (res < 0) 10411da177e4SLinus Torvalds break; 104247c716cbSTrond Myklebust } while (!desc->eof); 10432e7a4641STrond Myklebust 10442e7a4641STrond Myklebust spin_lock(&file->f_lock); 10452e7a4641STrond Myklebust dir_ctx->dir_cookie = desc->dir_cookie; 10462e7a4641STrond Myklebust dir_ctx->dup_cookie = desc->dup_cookie; 10472e7a4641STrond Myklebust dir_ctx->duped = desc->duped; 10482e7a4641STrond Myklebust dir_ctx->attr_gencount = desc->attr_gencount; 10492e7a4641STrond Myklebust spin_unlock(&file->f_lock); 10502e7a4641STrond Myklebust 1051fccca7fcSTrond Myklebust out: 10521e7cb3dcSChuck Lever if (res > 0) 10531e7cb3dcSChuck Lever res = 0; 10546de1472fSAl Viro dfprintk(FILE, "NFS: readdir(%pD2) returns %d\n", file, res); 10551da177e4SLinus Torvalds return res; 10561da177e4SLinus Torvalds } 10571da177e4SLinus Torvalds 1058965c8e59SAndrew Morton static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int whence) 1059f0dd2136STrond Myklebust { 1060480c2006SBryan Schumaker struct nfs_open_dir_context *dir_ctx = filp->private_data; 1061b84e06c5SChuck Lever 10626de1472fSAl Viro dfprintk(FILE, "NFS: llseek dir(%pD2, %lld, %d)\n", 10636de1472fSAl Viro filp, offset, whence); 1064b84e06c5SChuck Lever 1065965c8e59SAndrew Morton switch (whence) { 1066f0dd2136STrond Myklebust default: 1067b2b1ff3dSTrond Myklebust return -EINVAL; 1068b2b1ff3dSTrond Myklebust case SEEK_SET: 1069b2b1ff3dSTrond Myklebust if (offset < 0) 1070b2b1ff3dSTrond Myklebust return -EINVAL; 107183f2c45eSTrond Myklebust spin_lock(&filp->f_lock); 1072b2b1ff3dSTrond Myklebust break; 1073b2b1ff3dSTrond Myklebust case SEEK_CUR: 1074b2b1ff3dSTrond Myklebust if (offset == 0) 1075b2b1ff3dSTrond Myklebust return filp->f_pos; 107683f2c45eSTrond Myklebust spin_lock(&filp->f_lock); 1077b2b1ff3dSTrond Myklebust offset += filp->f_pos; 1078b2b1ff3dSTrond Myklebust if (offset < 0) { 107983f2c45eSTrond Myklebust spin_unlock(&filp->f_lock); 1080b2b1ff3dSTrond Myklebust return -EINVAL; 1081b2b1ff3dSTrond Myklebust } 1082f0dd2136STrond Myklebust } 1083f0dd2136STrond Myklebust if (offset != filp->f_pos) { 1084f0dd2136STrond Myklebust filp->f_pos = offset; 108559e356a9STrond Myklebust if (nfs_readdir_use_cookie(filp)) 108659e356a9STrond Myklebust dir_ctx->dir_cookie = offset; 108759e356a9STrond Myklebust else 1088480c2006SBryan Schumaker dir_ctx->dir_cookie = 0; 10898ef2ce3eSBryan Schumaker dir_ctx->duped = 0; 1090f0dd2136STrond Myklebust } 109183f2c45eSTrond Myklebust spin_unlock(&filp->f_lock); 1092f0dd2136STrond Myklebust return offset; 1093f0dd2136STrond Myklebust } 1094f0dd2136STrond Myklebust 10951da177e4SLinus Torvalds /* 10961da177e4SLinus Torvalds * All directory operations under NFS are synchronous, so fsync() 10971da177e4SLinus Torvalds * is a dummy operation. 10981da177e4SLinus Torvalds */ 109902c24a82SJosef Bacik static int nfs_fsync_dir(struct file *filp, loff_t start, loff_t end, 110002c24a82SJosef Bacik int datasync) 11011da177e4SLinus Torvalds { 11026de1472fSAl Viro dfprintk(FILE, "NFS: fsync dir(%pD2) datasync %d\n", filp, datasync); 11031e7cb3dcSChuck Lever 110411decaf8STrond Myklebust nfs_inc_stats(file_inode(filp), NFSIOS_VFSFSYNC); 11051da177e4SLinus Torvalds return 0; 11061da177e4SLinus Torvalds } 11071da177e4SLinus Torvalds 1108bfc69a45STrond Myklebust /** 1109bfc69a45STrond Myklebust * nfs_force_lookup_revalidate - Mark the directory as having changed 1110302fad7bSTrond Myklebust * @dir: pointer to directory inode 1111bfc69a45STrond Myklebust * 1112bfc69a45STrond Myklebust * This forces the revalidation code in nfs_lookup_revalidate() to do a 1113bfc69a45STrond Myklebust * full lookup on all child dentries of 'dir' whenever a change occurs 1114bfc69a45STrond Myklebust * on the server that might have invalidated our dcache. 1115bfc69a45STrond Myklebust * 1116efeda80dSTrond Myklebust * Note that we reserve bit '0' as a tag to let us know when a dentry 1117efeda80dSTrond Myklebust * was revalidated while holding a delegation on its inode. 1118efeda80dSTrond Myklebust * 1119bfc69a45STrond Myklebust * The caller should be holding dir->i_lock 1120bfc69a45STrond Myklebust */ 1121bfc69a45STrond Myklebust void nfs_force_lookup_revalidate(struct inode *dir) 1122bfc69a45STrond Myklebust { 1123efeda80dSTrond Myklebust NFS_I(dir)->cache_change_attribute += 2; 1124bfc69a45STrond Myklebust } 112589d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_force_lookup_revalidate); 1126bfc69a45STrond Myklebust 1127efeda80dSTrond Myklebust /** 1128efeda80dSTrond Myklebust * nfs_verify_change_attribute - Detects NFS remote directory changes 1129efeda80dSTrond Myklebust * @dir: pointer to parent directory inode 1130efeda80dSTrond Myklebust * @verf: previously saved change attribute 1131efeda80dSTrond Myklebust * 1132efeda80dSTrond Myklebust * Return "false" if the verifiers doesn't match the change attribute. 1133efeda80dSTrond Myklebust * This would usually indicate that the directory contents have changed on 1134efeda80dSTrond Myklebust * the server, and that any dentries need revalidating. 1135efeda80dSTrond Myklebust */ 1136efeda80dSTrond Myklebust static bool nfs_verify_change_attribute(struct inode *dir, unsigned long verf) 1137efeda80dSTrond Myklebust { 1138efeda80dSTrond Myklebust return (verf & ~1UL) == nfs_save_change_attribute(dir); 1139efeda80dSTrond Myklebust } 1140efeda80dSTrond Myklebust 1141efeda80dSTrond Myklebust static void nfs_set_verifier_delegated(unsigned long *verf) 1142efeda80dSTrond Myklebust { 1143efeda80dSTrond Myklebust *verf |= 1UL; 1144efeda80dSTrond Myklebust } 1145efeda80dSTrond Myklebust 1146efeda80dSTrond Myklebust #if IS_ENABLED(CONFIG_NFS_V4) 1147efeda80dSTrond Myklebust static void nfs_unset_verifier_delegated(unsigned long *verf) 1148efeda80dSTrond Myklebust { 1149efeda80dSTrond Myklebust *verf &= ~1UL; 1150efeda80dSTrond Myklebust } 1151efeda80dSTrond Myklebust #endif /* IS_ENABLED(CONFIG_NFS_V4) */ 1152efeda80dSTrond Myklebust 1153efeda80dSTrond Myklebust static bool nfs_test_verifier_delegated(unsigned long verf) 1154efeda80dSTrond Myklebust { 1155efeda80dSTrond Myklebust return verf & 1; 1156efeda80dSTrond Myklebust } 1157efeda80dSTrond Myklebust 1158efeda80dSTrond Myklebust static bool nfs_verifier_is_delegated(struct dentry *dentry) 1159efeda80dSTrond Myklebust { 1160efeda80dSTrond Myklebust return nfs_test_verifier_delegated(dentry->d_time); 1161efeda80dSTrond Myklebust } 1162efeda80dSTrond Myklebust 1163efeda80dSTrond Myklebust static void nfs_set_verifier_locked(struct dentry *dentry, unsigned long verf) 1164efeda80dSTrond Myklebust { 1165efeda80dSTrond Myklebust struct inode *inode = d_inode(dentry); 1166efeda80dSTrond Myklebust 1167efeda80dSTrond Myklebust if (!nfs_verifier_is_delegated(dentry) && 1168efeda80dSTrond Myklebust !nfs_verify_change_attribute(d_inode(dentry->d_parent), verf)) 1169efeda80dSTrond Myklebust goto out; 1170efeda80dSTrond Myklebust if (inode && NFS_PROTO(inode)->have_delegation(inode, FMODE_READ)) 1171efeda80dSTrond Myklebust nfs_set_verifier_delegated(&verf); 1172efeda80dSTrond Myklebust out: 1173efeda80dSTrond Myklebust dentry->d_time = verf; 1174efeda80dSTrond Myklebust } 1175efeda80dSTrond Myklebust 1176efeda80dSTrond Myklebust /** 1177efeda80dSTrond Myklebust * nfs_set_verifier - save a parent directory verifier in the dentry 1178efeda80dSTrond Myklebust * @dentry: pointer to dentry 1179efeda80dSTrond Myklebust * @verf: verifier to save 1180efeda80dSTrond Myklebust * 1181efeda80dSTrond Myklebust * Saves the parent directory verifier in @dentry. If the inode has 1182efeda80dSTrond Myklebust * a delegation, we also tag the dentry as having been revalidated 1183efeda80dSTrond Myklebust * while holding a delegation so that we know we don't have to 1184efeda80dSTrond Myklebust * look it up again after a directory change. 1185efeda80dSTrond Myklebust */ 1186efeda80dSTrond Myklebust void nfs_set_verifier(struct dentry *dentry, unsigned long verf) 1187efeda80dSTrond Myklebust { 1188efeda80dSTrond Myklebust 1189efeda80dSTrond Myklebust spin_lock(&dentry->d_lock); 1190efeda80dSTrond Myklebust nfs_set_verifier_locked(dentry, verf); 1191efeda80dSTrond Myklebust spin_unlock(&dentry->d_lock); 1192efeda80dSTrond Myklebust } 1193efeda80dSTrond Myklebust EXPORT_SYMBOL_GPL(nfs_set_verifier); 1194efeda80dSTrond Myklebust 1195efeda80dSTrond Myklebust #if IS_ENABLED(CONFIG_NFS_V4) 1196efeda80dSTrond Myklebust /** 1197efeda80dSTrond Myklebust * nfs_clear_verifier_delegated - clear the dir verifier delegation tag 1198efeda80dSTrond Myklebust * @inode: pointer to inode 1199efeda80dSTrond Myklebust * 1200efeda80dSTrond Myklebust * Iterates through the dentries in the inode alias list and clears 1201efeda80dSTrond Myklebust * the tag used to indicate that the dentry has been revalidated 1202efeda80dSTrond Myklebust * while holding a delegation. 1203efeda80dSTrond Myklebust * This function is intended for use when the delegation is being 1204efeda80dSTrond Myklebust * returned or revoked. 1205efeda80dSTrond Myklebust */ 1206efeda80dSTrond Myklebust void nfs_clear_verifier_delegated(struct inode *inode) 1207efeda80dSTrond Myklebust { 1208efeda80dSTrond Myklebust struct dentry *alias; 1209efeda80dSTrond Myklebust 1210efeda80dSTrond Myklebust if (!inode) 1211efeda80dSTrond Myklebust return; 1212efeda80dSTrond Myklebust spin_lock(&inode->i_lock); 1213efeda80dSTrond Myklebust hlist_for_each_entry(alias, &inode->i_dentry, d_u.d_alias) { 1214efeda80dSTrond Myklebust spin_lock(&alias->d_lock); 1215efeda80dSTrond Myklebust nfs_unset_verifier_delegated(&alias->d_time); 1216efeda80dSTrond Myklebust spin_unlock(&alias->d_lock); 1217efeda80dSTrond Myklebust } 1218efeda80dSTrond Myklebust spin_unlock(&inode->i_lock); 1219efeda80dSTrond Myklebust } 1220efeda80dSTrond Myklebust EXPORT_SYMBOL_GPL(nfs_clear_verifier_delegated); 1221efeda80dSTrond Myklebust #endif /* IS_ENABLED(CONFIG_NFS_V4) */ 1222efeda80dSTrond Myklebust 12231da177e4SLinus Torvalds /* 12241da177e4SLinus Torvalds * A check for whether or not the parent directory has changed. 12251da177e4SLinus Torvalds * In the case it has, we assume that the dentries are untrustworthy 12261da177e4SLinus Torvalds * and may need to be looked up again. 1227912a108dSNeilBrown * If rcu_walk prevents us from performing a full check, return 0. 12281da177e4SLinus Torvalds */ 1229912a108dSNeilBrown static int nfs_check_verifier(struct inode *dir, struct dentry *dentry, 1230912a108dSNeilBrown int rcu_walk) 12311da177e4SLinus Torvalds { 12321da177e4SLinus Torvalds if (IS_ROOT(dentry)) 12331da177e4SLinus Torvalds return 1; 12344eec952eSTrond Myklebust if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONE) 12354eec952eSTrond Myklebust return 0; 1236f2c77f4eSTrond Myklebust if (!nfs_verify_change_attribute(dir, dentry->d_time)) 12376ecc5e8fSTrond Myklebust return 0; 1238f2c77f4eSTrond Myklebust /* Revalidate nfsi->cache_change_attribute before we declare a match */ 12391cd9cb05STrond Myklebust if (nfs_mapping_need_revalidate_inode(dir)) { 1240912a108dSNeilBrown if (rcu_walk) 1241f2c77f4eSTrond Myklebust return 0; 12421cd9cb05STrond Myklebust if (__nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) 12431cd9cb05STrond Myklebust return 0; 12441cd9cb05STrond Myklebust } 1245f2c77f4eSTrond Myklebust if (!nfs_verify_change_attribute(dir, dentry->d_time)) 1246f2c77f4eSTrond Myklebust return 0; 1247f2c77f4eSTrond Myklebust return 1; 12481da177e4SLinus Torvalds } 12491da177e4SLinus Torvalds 12501da177e4SLinus Torvalds /* 1251a12802caSTrond Myklebust * Use intent information to check whether or not we're going to do 1252a12802caSTrond Myklebust * an O_EXCL create using this path component. 1253a12802caSTrond Myklebust */ 1254fa3c56bbSAl Viro static int nfs_is_exclusive_create(struct inode *dir, unsigned int flags) 1255a12802caSTrond Myklebust { 1256a12802caSTrond Myklebust if (NFS_PROTO(dir)->version == 2) 1257a12802caSTrond Myklebust return 0; 1258fa3c56bbSAl Viro return flags & LOOKUP_EXCL; 1259a12802caSTrond Myklebust } 1260a12802caSTrond Myklebust 1261a12802caSTrond Myklebust /* 12621d6757fbSTrond Myklebust * Inode and filehandle revalidation for lookups. 12631d6757fbSTrond Myklebust * 12641d6757fbSTrond Myklebust * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, 12651d6757fbSTrond Myklebust * or if the intent information indicates that we're about to open this 12661d6757fbSTrond Myklebust * particular file and the "nocto" mount flag is not set. 12671d6757fbSTrond Myklebust * 12681d6757fbSTrond Myklebust */ 126965a0c149STrond Myklebust static 1270fa3c56bbSAl Viro int nfs_lookup_verify_inode(struct inode *inode, unsigned int flags) 12711da177e4SLinus Torvalds { 12721da177e4SLinus Torvalds struct nfs_server *server = NFS_SERVER(inode); 127365a0c149STrond Myklebust int ret; 12741da177e4SLinus Torvalds 127536d43a43SDavid Howells if (IS_AUTOMOUNT(inode)) 12764e99a1ffSTrond Myklebust return 0; 127747921921STrond Myklebust 127847921921STrond Myklebust if (flags & LOOKUP_OPEN) { 127947921921STrond Myklebust switch (inode->i_mode & S_IFMT) { 128047921921STrond Myklebust case S_IFREG: 128147921921STrond Myklebust /* A NFSv4 OPEN will revalidate later */ 128247921921STrond Myklebust if (server->caps & NFS_CAP_ATOMIC_OPEN) 128347921921STrond Myklebust goto out; 1284df561f66SGustavo A. R. Silva fallthrough; 128547921921STrond Myklebust case S_IFDIR: 128647921921STrond Myklebust if (server->flags & NFS_MOUNT_NOCTO) 128747921921STrond Myklebust break; 128847921921STrond Myklebust /* NFS close-to-open cache consistency validation */ 128947921921STrond Myklebust goto out_force; 129047921921STrond Myklebust } 129147921921STrond Myklebust } 129247921921STrond Myklebust 12931da177e4SLinus Torvalds /* VFS wants an on-the-wire revalidation */ 1294fa3c56bbSAl Viro if (flags & LOOKUP_REVAL) 12951da177e4SLinus Torvalds goto out_force; 129665a0c149STrond Myklebust out: 1297a61246c9SLance Shelton return (inode->i_nlink == 0) ? -ESTALE : 0; 12981da177e4SLinus Torvalds out_force: 12991fa1e384SNeilBrown if (flags & LOOKUP_RCU) 13001fa1e384SNeilBrown return -ECHILD; 130165a0c149STrond Myklebust ret = __nfs_revalidate_inode(server, inode); 130265a0c149STrond Myklebust if (ret != 0) 130365a0c149STrond Myklebust return ret; 130465a0c149STrond Myklebust goto out; 13051da177e4SLinus Torvalds } 13061da177e4SLinus Torvalds 13071da177e4SLinus Torvalds /* 13081da177e4SLinus Torvalds * We judge how long we want to trust negative 13091da177e4SLinus Torvalds * dentries by looking at the parent inode mtime. 13101da177e4SLinus Torvalds * 13111da177e4SLinus Torvalds * If parent mtime has changed, we revalidate, else we wait for a 13121da177e4SLinus Torvalds * period corresponding to the parent's attribute cache timeout value. 1313912a108dSNeilBrown * 1314912a108dSNeilBrown * If LOOKUP_RCU prevents us from performing a full check, return 1 1315912a108dSNeilBrown * suggesting a reval is needed. 13169f6d44d4STrond Myklebust * 13179f6d44d4STrond Myklebust * Note that when creating a new file, or looking up a rename target, 13189f6d44d4STrond Myklebust * then it shouldn't be necessary to revalidate a negative dentry. 13191da177e4SLinus Torvalds */ 13201da177e4SLinus Torvalds static inline 13211da177e4SLinus Torvalds int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, 1322fa3c56bbSAl Viro unsigned int flags) 13231da177e4SLinus Torvalds { 13249f6d44d4STrond Myklebust if (flags & (LOOKUP_CREATE | LOOKUP_RENAME_TARGET)) 13251da177e4SLinus Torvalds return 0; 13264eec952eSTrond Myklebust if (NFS_SERVER(dir)->flags & NFS_MOUNT_LOOKUP_CACHE_NONEG) 13274eec952eSTrond Myklebust return 1; 1328912a108dSNeilBrown return !nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU); 13291da177e4SLinus Torvalds } 13301da177e4SLinus Torvalds 13315ceb9d7fSTrond Myklebust static int 13325ceb9d7fSTrond Myklebust nfs_lookup_revalidate_done(struct inode *dir, struct dentry *dentry, 13335ceb9d7fSTrond Myklebust struct inode *inode, int error) 13341da177e4SLinus Torvalds { 13355ceb9d7fSTrond Myklebust switch (error) { 13365ceb9d7fSTrond Myklebust case 1: 13376de1472fSAl Viro dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is valid\n", 13386de1472fSAl Viro __func__, dentry); 13391da177e4SLinus Torvalds return 1; 13405ceb9d7fSTrond Myklebust case 0: 1341a1643a92STrond Myklebust nfs_mark_for_revalidate(dir); 13421da177e4SLinus Torvalds if (inode && S_ISDIR(inode->i_mode)) { 13431da177e4SLinus Torvalds /* Purge readdir caches. */ 13441da177e4SLinus Torvalds nfs_zap_caches(inode); 1345a3f432bfSJ. Bruce Fields /* 1346a3f432bfSJ. Bruce Fields * We can't d_drop the root of a disconnected tree: 1347a3f432bfSJ. Bruce Fields * its d_hash is on the s_anon list and d_drop() would hide 1348a3f432bfSJ. Bruce Fields * it from shrink_dcache_for_unmount(), leading to busy 1349a3f432bfSJ. Bruce Fields * inodes on unmount and further oopses. 1350a3f432bfSJ. Bruce Fields */ 1351a3f432bfSJ. Bruce Fields if (IS_ROOT(dentry)) 13525ceb9d7fSTrond Myklebust return 1; 13531da177e4SLinus Torvalds } 13546de1472fSAl Viro dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) is invalid\n", 13556de1472fSAl Viro __func__, dentry); 13561da177e4SLinus Torvalds return 0; 13575ceb9d7fSTrond Myklebust } 13586de1472fSAl Viro dfprintk(LOOKUPCACHE, "NFS: %s(%pd2) lookup returned error %d\n", 13596de1472fSAl Viro __func__, dentry, error); 1360e1fb4d05STrond Myklebust return error; 13611da177e4SLinus Torvalds } 13621da177e4SLinus Torvalds 13635ceb9d7fSTrond Myklebust static int 13645ceb9d7fSTrond Myklebust nfs_lookup_revalidate_negative(struct inode *dir, struct dentry *dentry, 13655ceb9d7fSTrond Myklebust unsigned int flags) 13665ceb9d7fSTrond Myklebust { 13675ceb9d7fSTrond Myklebust int ret = 1; 13685ceb9d7fSTrond Myklebust if (nfs_neg_need_reval(dir, dentry, flags)) { 13695ceb9d7fSTrond Myklebust if (flags & LOOKUP_RCU) 13705ceb9d7fSTrond Myklebust return -ECHILD; 13715ceb9d7fSTrond Myklebust ret = 0; 13725ceb9d7fSTrond Myklebust } 13735ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, NULL, ret); 13745ceb9d7fSTrond Myklebust } 13755ceb9d7fSTrond Myklebust 13765ceb9d7fSTrond Myklebust static int 13775ceb9d7fSTrond Myklebust nfs_lookup_revalidate_delegated(struct inode *dir, struct dentry *dentry, 13785ceb9d7fSTrond Myklebust struct inode *inode) 13795ceb9d7fSTrond Myklebust { 13805ceb9d7fSTrond Myklebust nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 13815ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, inode, 1); 13825ceb9d7fSTrond Myklebust } 13835ceb9d7fSTrond Myklebust 13845ceb9d7fSTrond Myklebust static int 13855ceb9d7fSTrond Myklebust nfs_lookup_revalidate_dentry(struct inode *dir, struct dentry *dentry, 13865ceb9d7fSTrond Myklebust struct inode *inode) 13875ceb9d7fSTrond Myklebust { 13885ceb9d7fSTrond Myklebust struct nfs_fh *fhandle; 13895ceb9d7fSTrond Myklebust struct nfs_fattr *fattr; 13905ceb9d7fSTrond Myklebust struct nfs4_label *label; 1391a1147b82STrond Myklebust unsigned long dir_verifier; 13925ceb9d7fSTrond Myklebust int ret; 13935ceb9d7fSTrond Myklebust 13945ceb9d7fSTrond Myklebust ret = -ENOMEM; 13955ceb9d7fSTrond Myklebust fhandle = nfs_alloc_fhandle(); 13965ceb9d7fSTrond Myklebust fattr = nfs_alloc_fattr(); 13975ceb9d7fSTrond Myklebust label = nfs4_label_alloc(NFS_SERVER(inode), GFP_KERNEL); 13985ceb9d7fSTrond Myklebust if (fhandle == NULL || fattr == NULL || IS_ERR(label)) 13995ceb9d7fSTrond Myklebust goto out; 14005ceb9d7fSTrond Myklebust 1401a1147b82STrond Myklebust dir_verifier = nfs_save_change_attribute(dir); 1402f7b37b8bSTrond Myklebust ret = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr, label); 14035ceb9d7fSTrond Myklebust if (ret < 0) { 1404f7b37b8bSTrond Myklebust switch (ret) { 1405f7b37b8bSTrond Myklebust case -ESTALE: 1406f7b37b8bSTrond Myklebust case -ENOENT: 14075ceb9d7fSTrond Myklebust ret = 0; 1408f7b37b8bSTrond Myklebust break; 1409f7b37b8bSTrond Myklebust case -ETIMEDOUT: 1410f7b37b8bSTrond Myklebust if (NFS_SERVER(inode)->flags & NFS_MOUNT_SOFTREVAL) 1411f7b37b8bSTrond Myklebust ret = 1; 1412f7b37b8bSTrond Myklebust } 14135ceb9d7fSTrond Myklebust goto out; 14145ceb9d7fSTrond Myklebust } 14155ceb9d7fSTrond Myklebust ret = 0; 14165ceb9d7fSTrond Myklebust if (nfs_compare_fh(NFS_FH(inode), fhandle)) 14175ceb9d7fSTrond Myklebust goto out; 14185ceb9d7fSTrond Myklebust if (nfs_refresh_inode(inode, fattr) < 0) 14195ceb9d7fSTrond Myklebust goto out; 14205ceb9d7fSTrond Myklebust 14215ceb9d7fSTrond Myklebust nfs_setsecurity(inode, fattr, label); 1422a1147b82STrond Myklebust nfs_set_verifier(dentry, dir_verifier); 14235ceb9d7fSTrond Myklebust 14245ceb9d7fSTrond Myklebust /* set a readdirplus hint that we had a cache miss */ 14255ceb9d7fSTrond Myklebust nfs_force_use_readdirplus(dir); 14265ceb9d7fSTrond Myklebust ret = 1; 14275ceb9d7fSTrond Myklebust out: 14285ceb9d7fSTrond Myklebust nfs_free_fattr(fattr); 14295ceb9d7fSTrond Myklebust nfs_free_fhandle(fhandle); 14305ceb9d7fSTrond Myklebust nfs4_label_free(label); 14315ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, inode, ret); 14325ceb9d7fSTrond Myklebust } 14335ceb9d7fSTrond Myklebust 14345ceb9d7fSTrond Myklebust /* 14355ceb9d7fSTrond Myklebust * This is called every time the dcache has a lookup hit, 14365ceb9d7fSTrond Myklebust * and we should check whether we can really trust that 14375ceb9d7fSTrond Myklebust * lookup. 14385ceb9d7fSTrond Myklebust * 14395ceb9d7fSTrond Myklebust * NOTE! The hit can be a negative hit too, don't assume 14405ceb9d7fSTrond Myklebust * we have an inode! 14415ceb9d7fSTrond Myklebust * 14425ceb9d7fSTrond Myklebust * If the parent directory is seen to have changed, we throw out the 14435ceb9d7fSTrond Myklebust * cached dentry and do a new lookup. 14445ceb9d7fSTrond Myklebust */ 14455ceb9d7fSTrond Myklebust static int 14465ceb9d7fSTrond Myklebust nfs_do_lookup_revalidate(struct inode *dir, struct dentry *dentry, 14475ceb9d7fSTrond Myklebust unsigned int flags) 14485ceb9d7fSTrond Myklebust { 14495ceb9d7fSTrond Myklebust struct inode *inode; 14505ceb9d7fSTrond Myklebust int error; 14515ceb9d7fSTrond Myklebust 14525ceb9d7fSTrond Myklebust nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); 14535ceb9d7fSTrond Myklebust inode = d_inode(dentry); 14545ceb9d7fSTrond Myklebust 14555ceb9d7fSTrond Myklebust if (!inode) 14565ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_negative(dir, dentry, flags); 14575ceb9d7fSTrond Myklebust 14585ceb9d7fSTrond Myklebust if (is_bad_inode(inode)) { 14595ceb9d7fSTrond Myklebust dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", 14605ceb9d7fSTrond Myklebust __func__, dentry); 14615ceb9d7fSTrond Myklebust goto out_bad; 14625ceb9d7fSTrond Myklebust } 14635ceb9d7fSTrond Myklebust 1464efeda80dSTrond Myklebust if (nfs_verifier_is_delegated(dentry)) 14655ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_delegated(dir, dentry, inode); 14665ceb9d7fSTrond Myklebust 14675ceb9d7fSTrond Myklebust /* Force a full look up iff the parent directory has changed */ 14685ceb9d7fSTrond Myklebust if (!(flags & (LOOKUP_EXCL | LOOKUP_REVAL)) && 14695ceb9d7fSTrond Myklebust nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) { 14705ceb9d7fSTrond Myklebust error = nfs_lookup_verify_inode(inode, flags); 14715ceb9d7fSTrond Myklebust if (error) { 14725ceb9d7fSTrond Myklebust if (error == -ESTALE) 14735ceb9d7fSTrond Myklebust nfs_zap_caches(dir); 14745ceb9d7fSTrond Myklebust goto out_bad; 14755ceb9d7fSTrond Myklebust } 14765ceb9d7fSTrond Myklebust nfs_advise_use_readdirplus(dir); 14775ceb9d7fSTrond Myklebust goto out_valid; 14785ceb9d7fSTrond Myklebust } 14795ceb9d7fSTrond Myklebust 14805ceb9d7fSTrond Myklebust if (flags & LOOKUP_RCU) 14815ceb9d7fSTrond Myklebust return -ECHILD; 14825ceb9d7fSTrond Myklebust 14835ceb9d7fSTrond Myklebust if (NFS_STALE(inode)) 14845ceb9d7fSTrond Myklebust goto out_bad; 14855ceb9d7fSTrond Myklebust 14865ceb9d7fSTrond Myklebust trace_nfs_lookup_revalidate_enter(dir, dentry, flags); 14875ceb9d7fSTrond Myklebust error = nfs_lookup_revalidate_dentry(dir, dentry, inode); 14885ceb9d7fSTrond Myklebust trace_nfs_lookup_revalidate_exit(dir, dentry, flags, error); 14895ceb9d7fSTrond Myklebust return error; 14905ceb9d7fSTrond Myklebust out_valid: 14915ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, inode, 1); 14925ceb9d7fSTrond Myklebust out_bad: 14935ceb9d7fSTrond Myklebust if (flags & LOOKUP_RCU) 14945ceb9d7fSTrond Myklebust return -ECHILD; 14955ceb9d7fSTrond Myklebust return nfs_lookup_revalidate_done(dir, dentry, inode, 0); 14965ceb9d7fSTrond Myklebust } 14975ceb9d7fSTrond Myklebust 14985ceb9d7fSTrond Myklebust static int 1499c7944ebbSTrond Myklebust __nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags, 1500c7944ebbSTrond Myklebust int (*reval)(struct inode *, struct dentry *, unsigned int)) 15015ceb9d7fSTrond Myklebust { 15025ceb9d7fSTrond Myklebust struct dentry *parent; 15035ceb9d7fSTrond Myklebust struct inode *dir; 15045ceb9d7fSTrond Myklebust int ret; 15055ceb9d7fSTrond Myklebust 15065ceb9d7fSTrond Myklebust if (flags & LOOKUP_RCU) { 15075ceb9d7fSTrond Myklebust parent = READ_ONCE(dentry->d_parent); 15085ceb9d7fSTrond Myklebust dir = d_inode_rcu(parent); 15095ceb9d7fSTrond Myklebust if (!dir) 15105ceb9d7fSTrond Myklebust return -ECHILD; 1511c7944ebbSTrond Myklebust ret = reval(dir, dentry, flags); 15125ceb9d7fSTrond Myklebust if (parent != READ_ONCE(dentry->d_parent)) 15135ceb9d7fSTrond Myklebust return -ECHILD; 15145ceb9d7fSTrond Myklebust } else { 15155ceb9d7fSTrond Myklebust parent = dget_parent(dentry); 1516c7944ebbSTrond Myklebust ret = reval(d_inode(parent), dentry, flags); 15175ceb9d7fSTrond Myklebust dput(parent); 15185ceb9d7fSTrond Myklebust } 15195ceb9d7fSTrond Myklebust return ret; 15205ceb9d7fSTrond Myklebust } 15215ceb9d7fSTrond Myklebust 1522c7944ebbSTrond Myklebust static int nfs_lookup_revalidate(struct dentry *dentry, unsigned int flags) 1523c7944ebbSTrond Myklebust { 1524c7944ebbSTrond Myklebust return __nfs_lookup_revalidate(dentry, flags, nfs_do_lookup_revalidate); 1525c7944ebbSTrond Myklebust } 1526c7944ebbSTrond Myklebust 15271da177e4SLinus Torvalds /* 15282b0143b5SDavid Howells * A weaker form of d_revalidate for revalidating just the d_inode(dentry) 1529ecf3d1f1SJeff Layton * when we don't really care about the dentry name. This is called when a 1530ecf3d1f1SJeff Layton * pathwalk ends on a dentry that was not found via a normal lookup in the 1531ecf3d1f1SJeff Layton * parent dir (e.g.: ".", "..", procfs symlinks or mountpoint traversals). 1532ecf3d1f1SJeff Layton * 1533ecf3d1f1SJeff Layton * In this situation, we just want to verify that the inode itself is OK 1534ecf3d1f1SJeff Layton * since the dentry might have changed on the server. 1535ecf3d1f1SJeff Layton */ 1536ecf3d1f1SJeff Layton static int nfs_weak_revalidate(struct dentry *dentry, unsigned int flags) 1537ecf3d1f1SJeff Layton { 15382b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 15399cdd1d3fSTrond Myklebust int error = 0; 1540ecf3d1f1SJeff Layton 1541ecf3d1f1SJeff Layton /* 1542ecf3d1f1SJeff Layton * I believe we can only get a negative dentry here in the case of a 1543ecf3d1f1SJeff Layton * procfs-style symlink. Just assume it's correct for now, but we may 1544ecf3d1f1SJeff Layton * eventually need to do something more here. 1545ecf3d1f1SJeff Layton */ 1546ecf3d1f1SJeff Layton if (!inode) { 15476de1472fSAl Viro dfprintk(LOOKUPCACHE, "%s: %pd2 has negative inode\n", 15486de1472fSAl Viro __func__, dentry); 1549ecf3d1f1SJeff Layton return 1; 1550ecf3d1f1SJeff Layton } 1551ecf3d1f1SJeff Layton 1552ecf3d1f1SJeff Layton if (is_bad_inode(inode)) { 15536de1472fSAl Viro dfprintk(LOOKUPCACHE, "%s: %pd2 has dud inode\n", 15546de1472fSAl Viro __func__, dentry); 1555ecf3d1f1SJeff Layton return 0; 1556ecf3d1f1SJeff Layton } 1557ecf3d1f1SJeff Layton 1558b688741cSNeilBrown error = nfs_lookup_verify_inode(inode, flags); 1559ecf3d1f1SJeff Layton dfprintk(LOOKUPCACHE, "NFS: %s: inode %lu is %s\n", 1560ecf3d1f1SJeff Layton __func__, inode->i_ino, error ? "invalid" : "valid"); 1561ecf3d1f1SJeff Layton return !error; 1562ecf3d1f1SJeff Layton } 1563ecf3d1f1SJeff Layton 1564ecf3d1f1SJeff Layton /* 15651da177e4SLinus Torvalds * This is called from dput() when d_count is going to 0. 15661da177e4SLinus Torvalds */ 1567fe15ce44SNick Piggin static int nfs_dentry_delete(const struct dentry *dentry) 15681da177e4SLinus Torvalds { 15696de1472fSAl Viro dfprintk(VFS, "NFS: dentry_delete(%pd2, %x)\n", 15706de1472fSAl Viro dentry, dentry->d_flags); 15711da177e4SLinus Torvalds 157277f11192STrond Myklebust /* Unhash any dentry with a stale inode */ 15732b0143b5SDavid Howells if (d_really_is_positive(dentry) && NFS_STALE(d_inode(dentry))) 157477f11192STrond Myklebust return 1; 157577f11192STrond Myklebust 15761da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { 15771da177e4SLinus Torvalds /* Unhash it, so that ->d_iput() would be called */ 15781da177e4SLinus Torvalds return 1; 15791da177e4SLinus Torvalds } 15801751e8a6SLinus Torvalds if (!(dentry->d_sb->s_flags & SB_ACTIVE)) { 15811da177e4SLinus Torvalds /* Unhash it, so that ancestors of killed async unlink 15821da177e4SLinus Torvalds * files will be cleaned up during umount */ 15831da177e4SLinus Torvalds return 1; 15841da177e4SLinus Torvalds } 15851da177e4SLinus Torvalds return 0; 15861da177e4SLinus Torvalds 15871da177e4SLinus Torvalds } 15881da177e4SLinus Torvalds 15891f018458STrond Myklebust /* Ensure that we revalidate inode->i_nlink */ 15901b83d707STrond Myklebust static void nfs_drop_nlink(struct inode *inode) 15911b83d707STrond Myklebust { 15921b83d707STrond Myklebust spin_lock(&inode->i_lock); 15931f018458STrond Myklebust /* drop the inode if we're reasonably sure this is the last link */ 159459a707b0STrond Myklebust if (inode->i_nlink > 0) 159559a707b0STrond Myklebust drop_nlink(inode); 159659a707b0STrond Myklebust NFS_I(inode)->attr_gencount = nfs_inc_attr_generation_counter(); 159716e14375STrond Myklebust NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE 159816e14375STrond Myklebust | NFS_INO_INVALID_CTIME 159959a707b0STrond Myklebust | NFS_INO_INVALID_OTHER 160059a707b0STrond Myklebust | NFS_INO_REVAL_FORCED; 16011b83d707STrond Myklebust spin_unlock(&inode->i_lock); 16021b83d707STrond Myklebust } 16031b83d707STrond Myklebust 16041da177e4SLinus Torvalds /* 16051da177e4SLinus Torvalds * Called when the dentry loses inode. 16061da177e4SLinus Torvalds * We use it to clean up silly-renamed files. 16071da177e4SLinus Torvalds */ 16081da177e4SLinus Torvalds static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) 16091da177e4SLinus Torvalds { 161083672d39SNeil Brown if (S_ISDIR(inode->i_mode)) 161183672d39SNeil Brown /* drop any readdir cache as it could easily be old */ 161283672d39SNeil Brown NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; 161383672d39SNeil Brown 16141da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { 1615e4eff1a6STrond Myklebust nfs_complete_unlink(dentry, inode); 16161f018458STrond Myklebust nfs_drop_nlink(inode); 16171da177e4SLinus Torvalds } 16181da177e4SLinus Torvalds iput(inode); 16191da177e4SLinus Torvalds } 16201da177e4SLinus Torvalds 1621b1942c5fSAl Viro static void nfs_d_release(struct dentry *dentry) 1622b1942c5fSAl Viro { 1623b1942c5fSAl Viro /* free cached devname value, if it survived that far */ 1624b1942c5fSAl Viro if (unlikely(dentry->d_fsdata)) { 1625b1942c5fSAl Viro if (dentry->d_flags & DCACHE_NFSFS_RENAMED) 1626b1942c5fSAl Viro WARN_ON(1); 1627b1942c5fSAl Viro else 1628b1942c5fSAl Viro kfree(dentry->d_fsdata); 1629b1942c5fSAl Viro } 1630b1942c5fSAl Viro } 1631b1942c5fSAl Viro 1632f786aa90SAl Viro const struct dentry_operations nfs_dentry_operations = { 16331da177e4SLinus Torvalds .d_revalidate = nfs_lookup_revalidate, 1634ecf3d1f1SJeff Layton .d_weak_revalidate = nfs_weak_revalidate, 16351da177e4SLinus Torvalds .d_delete = nfs_dentry_delete, 16361da177e4SLinus Torvalds .d_iput = nfs_dentry_iput, 163736d43a43SDavid Howells .d_automount = nfs_d_automount, 1638b1942c5fSAl Viro .d_release = nfs_d_release, 16391da177e4SLinus Torvalds }; 1640ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_dentry_operations); 16411da177e4SLinus Torvalds 1642597d9289SBryan Schumaker struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, unsigned int flags) 16431da177e4SLinus Torvalds { 16441da177e4SLinus Torvalds struct dentry *res; 16451da177e4SLinus Torvalds struct inode *inode = NULL; 1646e1fb4d05STrond Myklebust struct nfs_fh *fhandle = NULL; 1647e1fb4d05STrond Myklebust struct nfs_fattr *fattr = NULL; 16481775fd3eSDavid Quigley struct nfs4_label *label = NULL; 1649a1147b82STrond Myklebust unsigned long dir_verifier; 16501da177e4SLinus Torvalds int error; 16511da177e4SLinus Torvalds 16526de1472fSAl Viro dfprintk(VFS, "NFS: lookup(%pd2)\n", dentry); 165391d5b470SChuck Lever nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); 16541da177e4SLinus Torvalds 1655130f9ab7SAl Viro if (unlikely(dentry->d_name.len > NFS_SERVER(dir)->namelen)) 1656130f9ab7SAl Viro return ERR_PTR(-ENAMETOOLONG); 16571da177e4SLinus Torvalds 1658fd684071STrond Myklebust /* 1659fd684071STrond Myklebust * If we're doing an exclusive create, optimize away the lookup 1660fd684071STrond Myklebust * but don't hash the dentry. 1661fd684071STrond Myklebust */ 16629f6d44d4STrond Myklebust if (nfs_is_exclusive_create(dir, flags) || flags & LOOKUP_RENAME_TARGET) 1663130f9ab7SAl Viro return NULL; 16641da177e4SLinus Torvalds 1665e1fb4d05STrond Myklebust res = ERR_PTR(-ENOMEM); 1666e1fb4d05STrond Myklebust fhandle = nfs_alloc_fhandle(); 1667e1fb4d05STrond Myklebust fattr = nfs_alloc_fattr(); 1668e1fb4d05STrond Myklebust if (fhandle == NULL || fattr == NULL) 1669e1fb4d05STrond Myklebust goto out; 1670e1fb4d05STrond Myklebust 167114c43f76SDavid Quigley label = nfs4_label_alloc(NFS_SERVER(dir), GFP_NOWAIT); 167214c43f76SDavid Quigley if (IS_ERR(label)) 167314c43f76SDavid Quigley goto out; 167414c43f76SDavid Quigley 1675a1147b82STrond Myklebust dir_verifier = nfs_save_change_attribute(dir); 16766e0d0be7STrond Myklebust trace_nfs_lookup_enter(dir, dentry, flags); 1677f7b37b8bSTrond Myklebust error = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr, label); 16781da177e4SLinus Torvalds if (error == -ENOENT) 16791da177e4SLinus Torvalds goto no_entry; 16801da177e4SLinus Torvalds if (error < 0) { 16811da177e4SLinus Torvalds res = ERR_PTR(error); 1682bf130914SAl Viro goto out_label; 16831da177e4SLinus Torvalds } 16841775fd3eSDavid Quigley inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); 1685bf0c84f1SNamhyung Kim res = ERR_CAST(inode); 168603f28e3aSTrond Myklebust if (IS_ERR(res)) 1687bf130914SAl Viro goto out_label; 168854ceac45SDavid Howells 168963519fbcSTrond Myklebust /* Notify readdir to use READDIRPLUS */ 169063519fbcSTrond Myklebust nfs_force_use_readdirplus(dir); 1691d69ee9b8STrond Myklebust 16921da177e4SLinus Torvalds no_entry: 169341d28bcaSAl Viro res = d_splice_alias(inode, dentry); 16949eaef27bSTrond Myklebust if (res != NULL) { 16959eaef27bSTrond Myklebust if (IS_ERR(res)) 1696bf130914SAl Viro goto out_label; 16971da177e4SLinus Torvalds dentry = res; 16989eaef27bSTrond Myklebust } 1699a1147b82STrond Myklebust nfs_set_verifier(dentry, dir_verifier); 1700bf130914SAl Viro out_label: 17016e0d0be7STrond Myklebust trace_nfs_lookup_exit(dir, dentry, flags, error); 170214c43f76SDavid Quigley nfs4_label_free(label); 17031da177e4SLinus Torvalds out: 1704e1fb4d05STrond Myklebust nfs_free_fattr(fattr); 1705e1fb4d05STrond Myklebust nfs_free_fhandle(fhandle); 17061da177e4SLinus Torvalds return res; 17071da177e4SLinus Torvalds } 1708ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_lookup); 17091da177e4SLinus Torvalds 171089d77c8fSBryan Schumaker #if IS_ENABLED(CONFIG_NFS_V4) 17110b728e19SAl Viro static int nfs4_lookup_revalidate(struct dentry *, unsigned int); 17121da177e4SLinus Torvalds 1713f786aa90SAl Viro const struct dentry_operations nfs4_dentry_operations = { 17140ef97dcfSMiklos Szeredi .d_revalidate = nfs4_lookup_revalidate, 1715b688741cSNeilBrown .d_weak_revalidate = nfs_weak_revalidate, 17161da177e4SLinus Torvalds .d_delete = nfs_dentry_delete, 17171da177e4SLinus Torvalds .d_iput = nfs_dentry_iput, 171836d43a43SDavid Howells .d_automount = nfs_d_automount, 1719b1942c5fSAl Viro .d_release = nfs_d_release, 17201da177e4SLinus Torvalds }; 172189d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs4_dentry_operations); 17221da177e4SLinus Torvalds 17238a5e929dSAl Viro static fmode_t flags_to_mode(int flags) 17248a5e929dSAl Viro { 17258a5e929dSAl Viro fmode_t res = (__force fmode_t)flags & FMODE_EXEC; 17268a5e929dSAl Viro if ((flags & O_ACCMODE) != O_WRONLY) 17278a5e929dSAl Viro res |= FMODE_READ; 17288a5e929dSAl Viro if ((flags & O_ACCMODE) != O_RDONLY) 17298a5e929dSAl Viro res |= FMODE_WRITE; 17308a5e929dSAl Viro return res; 17318a5e929dSAl Viro } 17328a5e929dSAl Viro 1733532d4defSNeilBrown static struct nfs_open_context *create_nfs_open_context(struct dentry *dentry, int open_flags, struct file *filp) 1734cd9a1c0eSTrond Myklebust { 1735532d4defSNeilBrown return alloc_nfs_open_context(dentry, flags_to_mode(open_flags), filp); 1736cd9a1c0eSTrond Myklebust } 1737cd9a1c0eSTrond Myklebust 1738cd9a1c0eSTrond Myklebust static int do_open(struct inode *inode, struct file *filp) 1739cd9a1c0eSTrond Myklebust { 1740f1fe29b4SDavid Howells nfs_fscache_open_file(inode, filp); 1741cd9a1c0eSTrond Myklebust return 0; 1742cd9a1c0eSTrond Myklebust } 1743cd9a1c0eSTrond Myklebust 1744d9585277SAl Viro static int nfs_finish_open(struct nfs_open_context *ctx, 17450dd2b474SMiklos Szeredi struct dentry *dentry, 1746b452a458SAl Viro struct file *file, unsigned open_flags) 1747cd9a1c0eSTrond Myklebust { 17480dd2b474SMiklos Szeredi int err; 17490dd2b474SMiklos Szeredi 1750be12af3eSAl Viro err = finish_open(file, dentry, do_open); 175130d90494SAl Viro if (err) 1752d9585277SAl Viro goto out; 1753eaa2b82cSNeilBrown if (S_ISREG(file->f_path.dentry->d_inode->i_mode)) 175430d90494SAl Viro nfs_file_set_open_context(file, ctx); 1755eaa2b82cSNeilBrown else 17569821421aSTrond Myklebust err = -EOPENSTALE; 1757cd9a1c0eSTrond Myklebust out: 1758d9585277SAl Viro return err; 1759cd9a1c0eSTrond Myklebust } 1760cd9a1c0eSTrond Myklebust 176173a79706SBryan Schumaker int nfs_atomic_open(struct inode *dir, struct dentry *dentry, 176230d90494SAl Viro struct file *file, unsigned open_flags, 176344907d79SAl Viro umode_t mode) 17641da177e4SLinus Torvalds { 1765c94c0953SAl Viro DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); 1766cd9a1c0eSTrond Myklebust struct nfs_open_context *ctx; 17670dd2b474SMiklos Szeredi struct dentry *res; 17680dd2b474SMiklos Szeredi struct iattr attr = { .ia_valid = ATTR_OPEN }; 1769f46e0bd3STrond Myklebust struct inode *inode; 17701472b83eSTrond Myklebust unsigned int lookup_flags = 0; 1771c94c0953SAl Viro bool switched = false; 177273a09dd9SAl Viro int created = 0; 1773898f635cSTrond Myklebust int err; 17741da177e4SLinus Torvalds 17750dd2b474SMiklos Szeredi /* Expect a negative dentry */ 17762b0143b5SDavid Howells BUG_ON(d_inode(dentry)); 17770dd2b474SMiklos Szeredi 17781e8968c5SNiels de Vos dfprintk(VFS, "NFS: atomic_open(%s/%lu), %pd\n", 17796de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 17801e7cb3dcSChuck Lever 17819597c13bSJeff Layton err = nfs_check_flags(open_flags); 17829597c13bSJeff Layton if (err) 17839597c13bSJeff Layton return err; 17849597c13bSJeff Layton 17850dd2b474SMiklos Szeredi /* NFS only supports OPEN on regular files */ 17860dd2b474SMiklos Szeredi if ((open_flags & O_DIRECTORY)) { 178700699ad8SAl Viro if (!d_in_lookup(dentry)) { 17880dd2b474SMiklos Szeredi /* 17890dd2b474SMiklos Szeredi * Hashed negative dentry with O_DIRECTORY: dentry was 17900dd2b474SMiklos Szeredi * revalidated and is fine, no need to perform lookup 17910dd2b474SMiklos Szeredi * again 17920dd2b474SMiklos Szeredi */ 1793d9585277SAl Viro return -ENOENT; 17940dd2b474SMiklos Szeredi } 17951472b83eSTrond Myklebust lookup_flags = LOOKUP_OPEN|LOOKUP_DIRECTORY; 17961da177e4SLinus Torvalds goto no_open; 17971da177e4SLinus Torvalds } 17981da177e4SLinus Torvalds 17990dd2b474SMiklos Szeredi if (dentry->d_name.len > NFS_SERVER(dir)->namelen) 1800d9585277SAl Viro return -ENAMETOOLONG; 18011da177e4SLinus Torvalds 18020dd2b474SMiklos Szeredi if (open_flags & O_CREAT) { 1803dff25ddbSAndreas Gruenbacher struct nfs_server *server = NFS_SERVER(dir); 1804dff25ddbSAndreas Gruenbacher 1805dff25ddbSAndreas Gruenbacher if (!(server->attr_bitmask[2] & FATTR4_WORD2_MODE_UMASK)) 1806dff25ddbSAndreas Gruenbacher mode &= ~current_umask(); 1807dff25ddbSAndreas Gruenbacher 1808536e43d1STrond Myklebust attr.ia_valid |= ATTR_MODE; 1809dff25ddbSAndreas Gruenbacher attr.ia_mode = mode; 18100dd2b474SMiklos Szeredi } 1811536e43d1STrond Myklebust if (open_flags & O_TRUNC) { 1812536e43d1STrond Myklebust attr.ia_valid |= ATTR_SIZE; 1813536e43d1STrond Myklebust attr.ia_size = 0; 1814cd9a1c0eSTrond Myklebust } 1815cd9a1c0eSTrond Myklebust 1816c94c0953SAl Viro if (!(open_flags & O_CREAT) && !d_in_lookup(dentry)) { 1817c94c0953SAl Viro d_drop(dentry); 1818c94c0953SAl Viro switched = true; 1819c94c0953SAl Viro dentry = d_alloc_parallel(dentry->d_parent, 1820c94c0953SAl Viro &dentry->d_name, &wq); 1821c94c0953SAl Viro if (IS_ERR(dentry)) 1822c94c0953SAl Viro return PTR_ERR(dentry); 1823c94c0953SAl Viro if (unlikely(!d_in_lookup(dentry))) 1824c94c0953SAl Viro return finish_no_open(file, dentry); 1825c94c0953SAl Viro } 1826c94c0953SAl Viro 1827532d4defSNeilBrown ctx = create_nfs_open_context(dentry, open_flags, file); 18280dd2b474SMiklos Szeredi err = PTR_ERR(ctx); 18290dd2b474SMiklos Szeredi if (IS_ERR(ctx)) 1830d9585277SAl Viro goto out; 18310dd2b474SMiklos Szeredi 18326e0d0be7STrond Myklebust trace_nfs_atomic_open_enter(dir, ctx, open_flags); 183373a09dd9SAl Viro inode = NFS_PROTO(dir)->open_context(dir, ctx, open_flags, &attr, &created); 183473a09dd9SAl Viro if (created) 183573a09dd9SAl Viro file->f_mode |= FMODE_CREATED; 1836275bb307STrond Myklebust if (IS_ERR(inode)) { 18370dd2b474SMiklos Szeredi err = PTR_ERR(inode); 18386e0d0be7STrond Myklebust trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); 18392d9db750STrond Myklebust put_nfs_open_context(ctx); 1840d20cb71dSAl Viro d_drop(dentry); 18410dd2b474SMiklos Szeredi switch (err) { 18421da177e4SLinus Torvalds case -ENOENT: 1843774d9513SPeng Tao d_splice_alias(NULL, dentry); 1844809fd143STrond Myklebust nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 18450dd2b474SMiklos Szeredi break; 18461788ea6eSJeff Layton case -EISDIR: 18476f926b5bSTrond Myklebust case -ENOTDIR: 18486f926b5bSTrond Myklebust goto no_open; 18491da177e4SLinus Torvalds case -ELOOP: 18500dd2b474SMiklos Szeredi if (!(open_flags & O_NOFOLLOW)) 18511da177e4SLinus Torvalds goto no_open; 18520dd2b474SMiklos Szeredi break; 18531da177e4SLinus Torvalds /* case -EINVAL: */ 18541da177e4SLinus Torvalds default: 18550dd2b474SMiklos Szeredi break; 18561da177e4SLinus Torvalds } 18571da177e4SLinus Torvalds goto out; 18581da177e4SLinus Torvalds } 18590dd2b474SMiklos Szeredi 1860b452a458SAl Viro err = nfs_finish_open(ctx, ctx->dentry, file, open_flags); 18616e0d0be7STrond Myklebust trace_nfs_atomic_open_exit(dir, ctx, open_flags, err); 18622d9db750STrond Myklebust put_nfs_open_context(ctx); 1863d9585277SAl Viro out: 1864c94c0953SAl Viro if (unlikely(switched)) { 1865c94c0953SAl Viro d_lookup_done(dentry); 1866c94c0953SAl Viro dput(dentry); 1867c94c0953SAl Viro } 1868d9585277SAl Viro return err; 18690dd2b474SMiklos Szeredi 18701da177e4SLinus Torvalds no_open: 18711472b83eSTrond Myklebust res = nfs_lookup(dir, dentry, lookup_flags); 1872c94c0953SAl Viro if (switched) { 1873c94c0953SAl Viro d_lookup_done(dentry); 1874c94c0953SAl Viro if (!res) 1875c94c0953SAl Viro res = dentry; 1876c94c0953SAl Viro else 1877c94c0953SAl Viro dput(dentry); 1878c94c0953SAl Viro } 18790dd2b474SMiklos Szeredi if (IS_ERR(res)) 1880c94c0953SAl Viro return PTR_ERR(res); 1881e45198a6SAl Viro return finish_no_open(file, res); 18821da177e4SLinus Torvalds } 188389d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_atomic_open); 18841da177e4SLinus Torvalds 1885c7944ebbSTrond Myklebust static int 1886c7944ebbSTrond Myklebust nfs4_do_lookup_revalidate(struct inode *dir, struct dentry *dentry, 1887c7944ebbSTrond Myklebust unsigned int flags) 18881da177e4SLinus Torvalds { 1889657e94b6SNick Piggin struct inode *inode; 18901da177e4SLinus Torvalds 1891fa3c56bbSAl Viro if (!(flags & LOOKUP_OPEN) || (flags & LOOKUP_DIRECTORY)) 1892c7944ebbSTrond Myklebust goto full_reval; 1893eda72afbSMiklos Szeredi if (d_mountpoint(dentry)) 1894c7944ebbSTrond Myklebust goto full_reval; 18952b484297STrond Myklebust 18962b0143b5SDavid Howells inode = d_inode(dentry); 18972b484297STrond Myklebust 18981da177e4SLinus Torvalds /* We can't create new files in nfs_open_revalidate(), so we 18991da177e4SLinus Torvalds * optimize away revalidation of negative dentries. 19001da177e4SLinus Torvalds */ 1901c7944ebbSTrond Myklebust if (inode == NULL) 1902c7944ebbSTrond Myklebust goto full_reval; 190349317a7fSNeilBrown 1904efeda80dSTrond Myklebust if (nfs_verifier_is_delegated(dentry)) 1905c7944ebbSTrond Myklebust return nfs_lookup_revalidate_delegated(dir, dentry, inode); 1906216d5d06STrond Myklebust 19071da177e4SLinus Torvalds /* NFS only supports OPEN on regular files */ 19081da177e4SLinus Torvalds if (!S_ISREG(inode->i_mode)) 1909c7944ebbSTrond Myklebust goto full_reval; 1910c7944ebbSTrond Myklebust 19111da177e4SLinus Torvalds /* We cannot do exclusive creation on a positive dentry */ 1912c7944ebbSTrond Myklebust if (flags & (LOOKUP_EXCL | LOOKUP_REVAL)) 1913c7944ebbSTrond Myklebust goto reval_dentry; 1914c7944ebbSTrond Myklebust 1915c7944ebbSTrond Myklebust /* Check if the directory changed */ 1916c7944ebbSTrond Myklebust if (!nfs_check_verifier(dir, dentry, flags & LOOKUP_RCU)) 1917c7944ebbSTrond Myklebust goto reval_dentry; 19181da177e4SLinus Torvalds 19190ef97dcfSMiklos Szeredi /* Let f_op->open() actually open (and revalidate) the file */ 1920c7944ebbSTrond Myklebust return 1; 1921c7944ebbSTrond Myklebust reval_dentry: 1922c7944ebbSTrond Myklebust if (flags & LOOKUP_RCU) 1923c7944ebbSTrond Myklebust return -ECHILD; 192442f72cf3Szhangliguang return nfs_lookup_revalidate_dentry(dir, dentry, inode); 19250ef97dcfSMiklos Szeredi 1926c7944ebbSTrond Myklebust full_reval: 1927c7944ebbSTrond Myklebust return nfs_do_lookup_revalidate(dir, dentry, flags); 1928c7944ebbSTrond Myklebust } 1929535918f1STrond Myklebust 1930c7944ebbSTrond Myklebust static int nfs4_lookup_revalidate(struct dentry *dentry, unsigned int flags) 1931c7944ebbSTrond Myklebust { 1932c7944ebbSTrond Myklebust return __nfs_lookup_revalidate(dentry, flags, 1933c7944ebbSTrond Myklebust nfs4_do_lookup_revalidate); 1934c0204fd2STrond Myklebust } 1935c0204fd2STrond Myklebust 19361da177e4SLinus Torvalds #endif /* CONFIG_NFSV4 */ 19371da177e4SLinus Torvalds 1938406cd915SBenjamin Coddington struct dentry * 1939406cd915SBenjamin Coddington nfs_add_or_obtain(struct dentry *dentry, struct nfs_fh *fhandle, 19401775fd3eSDavid Quigley struct nfs_fattr *fattr, 19411775fd3eSDavid Quigley struct nfs4_label *label) 19421da177e4SLinus Torvalds { 1943fab728e1STrond Myklebust struct dentry *parent = dget_parent(dentry); 19442b0143b5SDavid Howells struct inode *dir = d_inode(parent); 19451da177e4SLinus Torvalds struct inode *inode; 1946b0c6108eSAl Viro struct dentry *d; 1947406cd915SBenjamin Coddington int error; 19481da177e4SLinus Torvalds 1949fab728e1STrond Myklebust d_drop(dentry); 1950fab728e1STrond Myklebust 19511da177e4SLinus Torvalds if (fhandle->size == 0) { 1952f7b37b8bSTrond Myklebust error = NFS_PROTO(dir)->lookup(dir, dentry, fhandle, fattr, NULL); 19531da177e4SLinus Torvalds if (error) 1954fab728e1STrond Myklebust goto out_error; 19551da177e4SLinus Torvalds } 19565724ab37STrond Myklebust nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 19571da177e4SLinus Torvalds if (!(fattr->valid & NFS_ATTR_FATTR)) { 19581da177e4SLinus Torvalds struct nfs_server *server = NFS_SB(dentry->d_sb); 1959a841b54dSTrond Myklebust error = server->nfs_client->rpc_ops->getattr(server, fhandle, 1960a841b54dSTrond Myklebust fattr, NULL, NULL); 19611da177e4SLinus Torvalds if (error < 0) 1962fab728e1STrond Myklebust goto out_error; 19631da177e4SLinus Torvalds } 19641775fd3eSDavid Quigley inode = nfs_fhget(dentry->d_sb, fhandle, fattr, label); 1965b0c6108eSAl Viro d = d_splice_alias(inode, dentry); 1966fab728e1STrond Myklebust out: 1967fab728e1STrond Myklebust dput(parent); 1968406cd915SBenjamin Coddington return d; 1969fab728e1STrond Myklebust out_error: 1970fab728e1STrond Myklebust nfs_mark_for_revalidate(dir); 1971406cd915SBenjamin Coddington d = ERR_PTR(error); 1972406cd915SBenjamin Coddington goto out; 1973406cd915SBenjamin Coddington } 1974406cd915SBenjamin Coddington EXPORT_SYMBOL_GPL(nfs_add_or_obtain); 1975406cd915SBenjamin Coddington 1976406cd915SBenjamin Coddington /* 1977406cd915SBenjamin Coddington * Code common to create, mkdir, and mknod. 1978406cd915SBenjamin Coddington */ 1979406cd915SBenjamin Coddington int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, 1980406cd915SBenjamin Coddington struct nfs_fattr *fattr, 1981406cd915SBenjamin Coddington struct nfs4_label *label) 1982406cd915SBenjamin Coddington { 1983406cd915SBenjamin Coddington struct dentry *d; 1984406cd915SBenjamin Coddington 1985406cd915SBenjamin Coddington d = nfs_add_or_obtain(dentry, fhandle, fattr, label); 1986406cd915SBenjamin Coddington if (IS_ERR(d)) 1987406cd915SBenjamin Coddington return PTR_ERR(d); 1988406cd915SBenjamin Coddington 1989406cd915SBenjamin Coddington /* Callers don't care */ 1990406cd915SBenjamin Coddington dput(d); 1991406cd915SBenjamin Coddington return 0; 19921da177e4SLinus Torvalds } 1993ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_instantiate); 19941da177e4SLinus Torvalds 19951da177e4SLinus Torvalds /* 19961da177e4SLinus Torvalds * Following a failed create operation, we drop the dentry rather 19971da177e4SLinus Torvalds * than retain a negative dentry. This avoids a problem in the event 19981da177e4SLinus Torvalds * that the operation succeeded on the server, but an error in the 19991da177e4SLinus Torvalds * reply path made it appear to have failed. 20001da177e4SLinus Torvalds */ 2001597d9289SBryan Schumaker int nfs_create(struct inode *dir, struct dentry *dentry, 2002ebfc3b49SAl Viro umode_t mode, bool excl) 20031da177e4SLinus Torvalds { 20041da177e4SLinus Torvalds struct iattr attr; 2005ebfc3b49SAl Viro int open_flags = excl ? O_CREAT | O_EXCL : O_CREAT; 20061da177e4SLinus Torvalds int error; 20071da177e4SLinus Torvalds 20081e8968c5SNiels de Vos dfprintk(VFS, "NFS: create(%s/%lu), %pd\n", 20096de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 20101da177e4SLinus Torvalds 20111da177e4SLinus Torvalds attr.ia_mode = mode; 20121da177e4SLinus Torvalds attr.ia_valid = ATTR_MODE; 20131da177e4SLinus Torvalds 20148b0ad3d4STrond Myklebust trace_nfs_create_enter(dir, dentry, open_flags); 20158867fe58SMiklos Szeredi error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags); 20168b0ad3d4STrond Myklebust trace_nfs_create_exit(dir, dentry, open_flags, error); 20171da177e4SLinus Torvalds if (error != 0) 20181da177e4SLinus Torvalds goto out_err; 20191da177e4SLinus Torvalds return 0; 20201da177e4SLinus Torvalds out_err: 20211da177e4SLinus Torvalds d_drop(dentry); 20221da177e4SLinus Torvalds return error; 20231da177e4SLinus Torvalds } 2024ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_create); 20251da177e4SLinus Torvalds 20261da177e4SLinus Torvalds /* 20271da177e4SLinus Torvalds * See comments for nfs_proc_create regarding failed operations. 20281da177e4SLinus Torvalds */ 2029597d9289SBryan Schumaker int 20301a67aafbSAl Viro nfs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev) 20311da177e4SLinus Torvalds { 20321da177e4SLinus Torvalds struct iattr attr; 20331da177e4SLinus Torvalds int status; 20341da177e4SLinus Torvalds 20351e8968c5SNiels de Vos dfprintk(VFS, "NFS: mknod(%s/%lu), %pd\n", 20366de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 20371da177e4SLinus Torvalds 20381da177e4SLinus Torvalds attr.ia_mode = mode; 20391da177e4SLinus Torvalds attr.ia_valid = ATTR_MODE; 20401da177e4SLinus Torvalds 20411ca42382STrond Myklebust trace_nfs_mknod_enter(dir, dentry); 20421da177e4SLinus Torvalds status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); 20431ca42382STrond Myklebust trace_nfs_mknod_exit(dir, dentry, status); 20441da177e4SLinus Torvalds if (status != 0) 20451da177e4SLinus Torvalds goto out_err; 20461da177e4SLinus Torvalds return 0; 20471da177e4SLinus Torvalds out_err: 20481da177e4SLinus Torvalds d_drop(dentry); 20491da177e4SLinus Torvalds return status; 20501da177e4SLinus Torvalds } 2051ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_mknod); 20521da177e4SLinus Torvalds 20531da177e4SLinus Torvalds /* 20541da177e4SLinus Torvalds * See comments for nfs_proc_create regarding failed operations. 20551da177e4SLinus Torvalds */ 2056597d9289SBryan Schumaker int nfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode) 20571da177e4SLinus Torvalds { 20581da177e4SLinus Torvalds struct iattr attr; 20591da177e4SLinus Torvalds int error; 20601da177e4SLinus Torvalds 20611e8968c5SNiels de Vos dfprintk(VFS, "NFS: mkdir(%s/%lu), %pd\n", 20626de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 20631da177e4SLinus Torvalds 20641da177e4SLinus Torvalds attr.ia_valid = ATTR_MODE; 20651da177e4SLinus Torvalds attr.ia_mode = mode | S_IFDIR; 20661da177e4SLinus Torvalds 20671ca42382STrond Myklebust trace_nfs_mkdir_enter(dir, dentry); 20681da177e4SLinus Torvalds error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); 20691ca42382STrond Myklebust trace_nfs_mkdir_exit(dir, dentry, error); 20701da177e4SLinus Torvalds if (error != 0) 20711da177e4SLinus Torvalds goto out_err; 20721da177e4SLinus Torvalds return 0; 20731da177e4SLinus Torvalds out_err: 20741da177e4SLinus Torvalds d_drop(dentry); 20751da177e4SLinus Torvalds return error; 20761da177e4SLinus Torvalds } 2077ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_mkdir); 20781da177e4SLinus Torvalds 2079d45b9d8bSTrond Myklebust static void nfs_dentry_handle_enoent(struct dentry *dentry) 2080d45b9d8bSTrond Myklebust { 2081dc3f4198SAl Viro if (simple_positive(dentry)) 2082d45b9d8bSTrond Myklebust d_delete(dentry); 2083d45b9d8bSTrond Myklebust } 2084d45b9d8bSTrond Myklebust 2085597d9289SBryan Schumaker int nfs_rmdir(struct inode *dir, struct dentry *dentry) 20861da177e4SLinus Torvalds { 20871da177e4SLinus Torvalds int error; 20881da177e4SLinus Torvalds 20891e8968c5SNiels de Vos dfprintk(VFS, "NFS: rmdir(%s/%lu), %pd\n", 20906de1472fSAl Viro dir->i_sb->s_id, dir->i_ino, dentry); 20911da177e4SLinus Torvalds 20921ca42382STrond Myklebust trace_nfs_rmdir_enter(dir, dentry); 20932b0143b5SDavid Howells if (d_really_is_positive(dentry)) { 2094884be175SAl Viro down_write(&NFS_I(d_inode(dentry))->rmdir_sem); 20951da177e4SLinus Torvalds error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); 20961da177e4SLinus Torvalds /* Ensure the VFS deletes this inode */ 2097ba6c0592STrond Myklebust switch (error) { 2098ba6c0592STrond Myklebust case 0: 20992b0143b5SDavid Howells clear_nlink(d_inode(dentry)); 2100ba6c0592STrond Myklebust break; 2101ba6c0592STrond Myklebust case -ENOENT: 2102d45b9d8bSTrond Myklebust nfs_dentry_handle_enoent(dentry); 2103ba6c0592STrond Myklebust } 2104884be175SAl Viro up_write(&NFS_I(d_inode(dentry))->rmdir_sem); 2105ba6c0592STrond Myklebust } else 2106ba6c0592STrond Myklebust error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); 21071ca42382STrond Myklebust trace_nfs_rmdir_exit(dir, dentry, error); 21081da177e4SLinus Torvalds 21091da177e4SLinus Torvalds return error; 21101da177e4SLinus Torvalds } 2111ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_rmdir); 21121da177e4SLinus Torvalds 21131da177e4SLinus Torvalds /* 21141da177e4SLinus Torvalds * Remove a file after making sure there are no pending writes, 21151da177e4SLinus Torvalds * and after checking that the file has only one user. 21161da177e4SLinus Torvalds * 21171da177e4SLinus Torvalds * We invalidate the attribute cache and free the inode prior to the operation 21181da177e4SLinus Torvalds * to avoid possible races if the server reuses the inode. 21191da177e4SLinus Torvalds */ 21201da177e4SLinus Torvalds static int nfs_safe_remove(struct dentry *dentry) 21211da177e4SLinus Torvalds { 21222b0143b5SDavid Howells struct inode *dir = d_inode(dentry->d_parent); 21232b0143b5SDavid Howells struct inode *inode = d_inode(dentry); 21241da177e4SLinus Torvalds int error = -EBUSY; 21251da177e4SLinus Torvalds 21266de1472fSAl Viro dfprintk(VFS, "NFS: safe_remove(%pd2)\n", dentry); 21271da177e4SLinus Torvalds 21281da177e4SLinus Torvalds /* If the dentry was sillyrenamed, we simply call d_delete() */ 21291da177e4SLinus Torvalds if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { 21301da177e4SLinus Torvalds error = 0; 21311da177e4SLinus Torvalds goto out; 21321da177e4SLinus Torvalds } 21331da177e4SLinus Torvalds 21341ca42382STrond Myklebust trace_nfs_remove_enter(dir, dentry); 21351da177e4SLinus Torvalds if (inode != NULL) { 2136912678dbSTrond Myklebust error = NFS_PROTO(dir)->remove(dir, dentry); 21371da177e4SLinus Torvalds if (error == 0) 21381b83d707STrond Myklebust nfs_drop_nlink(inode); 21391da177e4SLinus Torvalds } else 2140912678dbSTrond Myklebust error = NFS_PROTO(dir)->remove(dir, dentry); 2141d45b9d8bSTrond Myklebust if (error == -ENOENT) 2142d45b9d8bSTrond Myklebust nfs_dentry_handle_enoent(dentry); 21431ca42382STrond Myklebust trace_nfs_remove_exit(dir, dentry, error); 21441da177e4SLinus Torvalds out: 21451da177e4SLinus Torvalds return error; 21461da177e4SLinus Torvalds } 21471da177e4SLinus Torvalds 21481da177e4SLinus Torvalds /* We do silly rename. In case sillyrename() returns -EBUSY, the inode 21491da177e4SLinus Torvalds * belongs to an active ".nfs..." file and we return -EBUSY. 21501da177e4SLinus Torvalds * 21511da177e4SLinus Torvalds * If sillyrename() returns 0, we do nothing, otherwise we unlink. 21521da177e4SLinus Torvalds */ 2153597d9289SBryan Schumaker int nfs_unlink(struct inode *dir, struct dentry *dentry) 21541da177e4SLinus Torvalds { 21551da177e4SLinus Torvalds int error; 21561da177e4SLinus Torvalds int need_rehash = 0; 21571da177e4SLinus Torvalds 21581e8968c5SNiels de Vos dfprintk(VFS, "NFS: unlink(%s/%lu, %pd)\n", dir->i_sb->s_id, 21596de1472fSAl Viro dir->i_ino, dentry); 21601da177e4SLinus Torvalds 21611ca42382STrond Myklebust trace_nfs_unlink_enter(dir, dentry); 21621da177e4SLinus Torvalds spin_lock(&dentry->d_lock); 216384d08fa8SAl Viro if (d_count(dentry) > 1) { 21641da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 2165ccfeb506STrond Myklebust /* Start asynchronous writeout of the inode */ 21662b0143b5SDavid Howells write_inode_now(d_inode(dentry), 0); 21671da177e4SLinus Torvalds error = nfs_sillyrename(dir, dentry); 21681ca42382STrond Myklebust goto out; 21691da177e4SLinus Torvalds } 21701da177e4SLinus Torvalds if (!d_unhashed(dentry)) { 21711da177e4SLinus Torvalds __d_drop(dentry); 21721da177e4SLinus Torvalds need_rehash = 1; 21731da177e4SLinus Torvalds } 21741da177e4SLinus Torvalds spin_unlock(&dentry->d_lock); 21751da177e4SLinus Torvalds error = nfs_safe_remove(dentry); 2176d45b9d8bSTrond Myklebust if (!error || error == -ENOENT) { 21771da177e4SLinus Torvalds nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); 21781da177e4SLinus Torvalds } else if (need_rehash) 21791da177e4SLinus Torvalds d_rehash(dentry); 21801ca42382STrond Myklebust out: 21811ca42382STrond Myklebust trace_nfs_unlink_exit(dir, dentry, error); 21821da177e4SLinus Torvalds return error; 21831da177e4SLinus Torvalds } 2184ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_unlink); 21851da177e4SLinus Torvalds 2186873101b3SChuck Lever /* 2187873101b3SChuck Lever * To create a symbolic link, most file systems instantiate a new inode, 2188873101b3SChuck Lever * add a page to it containing the path, then write it out to the disk 2189873101b3SChuck Lever * using prepare_write/commit_write. 2190873101b3SChuck Lever * 2191873101b3SChuck Lever * Unfortunately the NFS client can't create the in-core inode first 2192873101b3SChuck Lever * because it needs a file handle to create an in-core inode (see 2193873101b3SChuck Lever * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the 2194873101b3SChuck Lever * symlink request has completed on the server. 2195873101b3SChuck Lever * 2196873101b3SChuck Lever * So instead we allocate a raw page, copy the symname into it, then do 2197873101b3SChuck Lever * the SYMLINK request with the page as the buffer. If it succeeds, we 2198873101b3SChuck Lever * now have a new file handle and can instantiate an in-core NFS inode 2199873101b3SChuck Lever * and move the raw page into its mapping. 2200873101b3SChuck Lever */ 2201597d9289SBryan Schumaker int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) 22021da177e4SLinus Torvalds { 2203873101b3SChuck Lever struct page *page; 2204873101b3SChuck Lever char *kaddr; 22051da177e4SLinus Torvalds struct iattr attr; 2206873101b3SChuck Lever unsigned int pathlen = strlen(symname); 22071da177e4SLinus Torvalds int error; 22081da177e4SLinus Torvalds 22091e8968c5SNiels de Vos dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s)\n", dir->i_sb->s_id, 22106de1472fSAl Viro dir->i_ino, dentry, symname); 22111da177e4SLinus Torvalds 2212873101b3SChuck Lever if (pathlen > PAGE_SIZE) 2213873101b3SChuck Lever return -ENAMETOOLONG; 22141da177e4SLinus Torvalds 2215873101b3SChuck Lever attr.ia_mode = S_IFLNK | S_IRWXUGO; 2216873101b3SChuck Lever attr.ia_valid = ATTR_MODE; 22171da177e4SLinus Torvalds 2218e8ecde25SAl Viro page = alloc_page(GFP_USER); 221976566991STrond Myklebust if (!page) 2220873101b3SChuck Lever return -ENOMEM; 2221873101b3SChuck Lever 2222e8ecde25SAl Viro kaddr = page_address(page); 2223873101b3SChuck Lever memcpy(kaddr, symname, pathlen); 2224873101b3SChuck Lever if (pathlen < PAGE_SIZE) 2225873101b3SChuck Lever memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); 2226873101b3SChuck Lever 22271ca42382STrond Myklebust trace_nfs_symlink_enter(dir, dentry); 222894a6d753SChuck Lever error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); 22291ca42382STrond Myklebust trace_nfs_symlink_exit(dir, dentry, error); 2230873101b3SChuck Lever if (error != 0) { 22311e8968c5SNiels de Vos dfprintk(VFS, "NFS: symlink(%s/%lu, %pd, %s) error %d\n", 2232873101b3SChuck Lever dir->i_sb->s_id, dir->i_ino, 22336de1472fSAl Viro dentry, symname, error); 22341da177e4SLinus Torvalds d_drop(dentry); 2235873101b3SChuck Lever __free_page(page); 22361da177e4SLinus Torvalds return error; 22371da177e4SLinus Torvalds } 22381da177e4SLinus Torvalds 2239873101b3SChuck Lever /* 2240873101b3SChuck Lever * No big deal if we can't add this page to the page cache here. 2241873101b3SChuck Lever * READLINK will get the missing page from the server if needed. 2242873101b3SChuck Lever */ 22432b0143b5SDavid Howells if (!add_to_page_cache_lru(page, d_inode(dentry)->i_mapping, 0, 2244873101b3SChuck Lever GFP_KERNEL)) { 2245873101b3SChuck Lever SetPageUptodate(page); 2246873101b3SChuck Lever unlock_page(page); 2247a0b54addSRafael Aquini /* 2248a0b54addSRafael Aquini * add_to_page_cache_lru() grabs an extra page refcount. 2249a0b54addSRafael Aquini * Drop it here to avoid leaking this page later. 2250a0b54addSRafael Aquini */ 225109cbfeafSKirill A. Shutemov put_page(page); 2252873101b3SChuck Lever } else 2253873101b3SChuck Lever __free_page(page); 2254873101b3SChuck Lever 2255873101b3SChuck Lever return 0; 2256873101b3SChuck Lever } 2257ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_symlink); 2258873101b3SChuck Lever 2259597d9289SBryan Schumaker int 22601da177e4SLinus Torvalds nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) 22611da177e4SLinus Torvalds { 22622b0143b5SDavid Howells struct inode *inode = d_inode(old_dentry); 22631da177e4SLinus Torvalds int error; 22641da177e4SLinus Torvalds 22656de1472fSAl Viro dfprintk(VFS, "NFS: link(%pd2 -> %pd2)\n", 22666de1472fSAl Viro old_dentry, dentry); 22671da177e4SLinus Torvalds 22681fd1085bSTrond Myklebust trace_nfs_link_enter(inode, dir, dentry); 22699697d234STrond Myklebust d_drop(dentry); 22701da177e4SLinus Torvalds error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); 2271cf809556STrond Myklebust if (error == 0) { 22727de9c6eeSAl Viro ihold(inode); 22739697d234STrond Myklebust d_add(dentry, inode); 2274cf809556STrond Myklebust } 22751fd1085bSTrond Myklebust trace_nfs_link_exit(inode, dir, dentry, error); 22761da177e4SLinus Torvalds return error; 22771da177e4SLinus Torvalds } 2278ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_link); 22791da177e4SLinus Torvalds 22801da177e4SLinus Torvalds /* 22811da177e4SLinus Torvalds * RENAME 22821da177e4SLinus Torvalds * FIXME: Some nfsds, like the Linux user space nfsd, may generate a 22831da177e4SLinus Torvalds * different file handle for the same inode after a rename (e.g. when 22841da177e4SLinus Torvalds * moving to a different directory). A fail-safe method to do so would 22851da177e4SLinus Torvalds * be to look up old_dir/old_name, create a link to new_dir/new_name and 22861da177e4SLinus Torvalds * rename the old file using the sillyrename stuff. This way, the original 22871da177e4SLinus Torvalds * file in old_dir will go away when the last process iput()s the inode. 22881da177e4SLinus Torvalds * 22891da177e4SLinus Torvalds * FIXED. 22901da177e4SLinus Torvalds * 22911da177e4SLinus Torvalds * It actually works quite well. One needs to have the possibility for 22921da177e4SLinus Torvalds * at least one ".nfs..." file in each directory the file ever gets 22931da177e4SLinus Torvalds * moved or linked to which happens automagically with the new 22941da177e4SLinus Torvalds * implementation that only depends on the dcache stuff instead of 22951da177e4SLinus Torvalds * using the inode layer 22961da177e4SLinus Torvalds * 22971da177e4SLinus Torvalds * Unfortunately, things are a little more complicated than indicated 22981da177e4SLinus Torvalds * above. For a cross-directory move, we want to make sure we can get 22991da177e4SLinus Torvalds * rid of the old inode after the operation. This means there must be 23001da177e4SLinus Torvalds * no pending writes (if it's a file), and the use count must be 1. 23011da177e4SLinus Torvalds * If these conditions are met, we can drop the dentries before doing 23021da177e4SLinus Torvalds * the rename. 23031da177e4SLinus Torvalds */ 2304597d9289SBryan Schumaker int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, 23051cd66c93SMiklos Szeredi struct inode *new_dir, struct dentry *new_dentry, 23061cd66c93SMiklos Szeredi unsigned int flags) 23071da177e4SLinus Torvalds { 23082b0143b5SDavid Howells struct inode *old_inode = d_inode(old_dentry); 23092b0143b5SDavid Howells struct inode *new_inode = d_inode(new_dentry); 2310d9f29500SBenjamin Coddington struct dentry *dentry = NULL, *rehash = NULL; 231180a491fdSJeff Layton struct rpc_task *task; 23121da177e4SLinus Torvalds int error = -EBUSY; 23131da177e4SLinus Torvalds 23141cd66c93SMiklos Szeredi if (flags) 23151cd66c93SMiklos Szeredi return -EINVAL; 23161cd66c93SMiklos Szeredi 23176de1472fSAl Viro dfprintk(VFS, "NFS: rename(%pd2 -> %pd2, ct=%d)\n", 23186de1472fSAl Viro old_dentry, new_dentry, 231984d08fa8SAl Viro d_count(new_dentry)); 23201da177e4SLinus Torvalds 232170ded201STrond Myklebust trace_nfs_rename_enter(old_dir, old_dentry, new_dir, new_dentry); 23221da177e4SLinus Torvalds /* 232328f79a1aSMiklos Szeredi * For non-directories, check whether the target is busy and if so, 232428f79a1aSMiklos Szeredi * make a copy of the dentry and then do a silly-rename. If the 232528f79a1aSMiklos Szeredi * silly-rename succeeds, the copied dentry is hashed and becomes 232628f79a1aSMiklos Szeredi * the new target. 23271da177e4SLinus Torvalds */ 232827226104SMiklos Szeredi if (new_inode && !S_ISDIR(new_inode->i_mode)) { 232927226104SMiklos Szeredi /* 233027226104SMiklos Szeredi * To prevent any new references to the target during the 233127226104SMiklos Szeredi * rename, we unhash the dentry in advance. 233227226104SMiklos Szeredi */ 2333d9f29500SBenjamin Coddington if (!d_unhashed(new_dentry)) { 233427226104SMiklos Szeredi d_drop(new_dentry); 2335d9f29500SBenjamin Coddington rehash = new_dentry; 2336d9f29500SBenjamin Coddington } 233727226104SMiklos Szeredi 233884d08fa8SAl Viro if (d_count(new_dentry) > 2) { 23391da177e4SLinus Torvalds int err; 234027226104SMiklos Szeredi 23411da177e4SLinus Torvalds /* copy the target dentry's name */ 23421da177e4SLinus Torvalds dentry = d_alloc(new_dentry->d_parent, 23431da177e4SLinus Torvalds &new_dentry->d_name); 23441da177e4SLinus Torvalds if (!dentry) 23451da177e4SLinus Torvalds goto out; 23461da177e4SLinus Torvalds 23471da177e4SLinus Torvalds /* silly-rename the existing target ... */ 23481da177e4SLinus Torvalds err = nfs_sillyrename(new_dir, new_dentry); 234924e93025SMiklos Szeredi if (err) 23501da177e4SLinus Torvalds goto out; 235124e93025SMiklos Szeredi 235224e93025SMiklos Szeredi new_dentry = dentry; 2353d9f29500SBenjamin Coddington rehash = NULL; 235424e93025SMiklos Szeredi new_inode = NULL; 2355b1e4adf4STrond Myklebust } 235627226104SMiklos Szeredi } 23571da177e4SLinus Torvalds 2358d9f29500SBenjamin Coddington task = nfs_async_rename(old_dir, new_dir, old_dentry, new_dentry, NULL); 235980a491fdSJeff Layton if (IS_ERR(task)) { 236080a491fdSJeff Layton error = PTR_ERR(task); 236180a491fdSJeff Layton goto out; 236280a491fdSJeff Layton } 236380a491fdSJeff Layton 236480a491fdSJeff Layton error = rpc_wait_for_completion_task(task); 2365818a8dbeSBenjamin Coddington if (error != 0) { 2366818a8dbeSBenjamin Coddington ((struct nfs_renamedata *)task->tk_calldata)->cancelled = 1; 2367818a8dbeSBenjamin Coddington /* Paired with the atomic_dec_and_test() barrier in rpc_do_put_task() */ 2368818a8dbeSBenjamin Coddington smp_wmb(); 2369818a8dbeSBenjamin Coddington } else 237080a491fdSJeff Layton error = task->tk_status; 237180a491fdSJeff Layton rpc_put_task(task); 237259a707b0STrond Myklebust /* Ensure the inode attributes are revalidated */ 237359a707b0STrond Myklebust if (error == 0) { 237459a707b0STrond Myklebust spin_lock(&old_inode->i_lock); 237559a707b0STrond Myklebust NFS_I(old_inode)->attr_gencount = nfs_inc_attr_generation_counter(); 237659a707b0STrond Myklebust NFS_I(old_inode)->cache_validity |= NFS_INO_INVALID_CHANGE 237759a707b0STrond Myklebust | NFS_INO_INVALID_CTIME 237859a707b0STrond Myklebust | NFS_INO_REVAL_FORCED; 237959a707b0STrond Myklebust spin_unlock(&old_inode->i_lock); 238059a707b0STrond Myklebust } 23811da177e4SLinus Torvalds out: 2382d9f29500SBenjamin Coddington if (rehash) 2383d9f29500SBenjamin Coddington d_rehash(rehash); 238470ded201STrond Myklebust trace_nfs_rename_exit(old_dir, old_dentry, 238570ded201STrond Myklebust new_dir, new_dentry, error); 2386d9f29500SBenjamin Coddington if (!error) { 2387d9f29500SBenjamin Coddington if (new_inode != NULL) 2388d9f29500SBenjamin Coddington nfs_drop_nlink(new_inode); 2389d9f29500SBenjamin Coddington /* 2390d9f29500SBenjamin Coddington * The d_move() should be here instead of in an async RPC completion 2391d9f29500SBenjamin Coddington * handler because we need the proper locks to move the dentry. If 2392d9f29500SBenjamin Coddington * we're interrupted by a signal, the async RPC completion handler 2393d9f29500SBenjamin Coddington * should mark the directories for revalidation. 2394d9f29500SBenjamin Coddington */ 2395d9f29500SBenjamin Coddington d_move(old_dentry, new_dentry); 2396d803224cSTrond Myklebust nfs_set_verifier(old_dentry, 2397d9f29500SBenjamin Coddington nfs_save_change_attribute(new_dir)); 2398d9f29500SBenjamin Coddington } else if (error == -ENOENT) 2399d9f29500SBenjamin Coddington nfs_dentry_handle_enoent(old_dentry); 2400d9f29500SBenjamin Coddington 24011da177e4SLinus Torvalds /* new dentry created? */ 24021da177e4SLinus Torvalds if (dentry) 24031da177e4SLinus Torvalds dput(dentry); 24041da177e4SLinus Torvalds return error; 24051da177e4SLinus Torvalds } 2406ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_rename); 24071da177e4SLinus Torvalds 2408cfcea3e8STrond Myklebust static DEFINE_SPINLOCK(nfs_access_lru_lock); 2409cfcea3e8STrond Myklebust static LIST_HEAD(nfs_access_lru_list); 2410cfcea3e8STrond Myklebust static atomic_long_t nfs_access_nr_entries; 2411cfcea3e8STrond Myklebust 2412a8b373eeSTrond Myklebust static unsigned long nfs_access_max_cachesize = 4*1024*1024; 24133a505845STrond Myklebust module_param(nfs_access_max_cachesize, ulong, 0644); 24143a505845STrond Myklebust MODULE_PARM_DESC(nfs_access_max_cachesize, "NFS access maximum total cache length"); 24153a505845STrond Myklebust 24161c3c07e9STrond Myklebust static void nfs_access_free_entry(struct nfs_access_entry *entry) 24171c3c07e9STrond Myklebust { 2418b68572e0SNeilBrown put_cred(entry->cred); 2419f682a398SNeilBrown kfree_rcu(entry, rcu_head); 24204e857c58SPeter Zijlstra smp_mb__before_atomic(); 2421cfcea3e8STrond Myklebust atomic_long_dec(&nfs_access_nr_entries); 24224e857c58SPeter Zijlstra smp_mb__after_atomic(); 24231c3c07e9STrond Myklebust } 24241c3c07e9STrond Myklebust 24251a81bb8aSTrond Myklebust static void nfs_access_free_list(struct list_head *head) 24261a81bb8aSTrond Myklebust { 24271a81bb8aSTrond Myklebust struct nfs_access_entry *cache; 24281a81bb8aSTrond Myklebust 24291a81bb8aSTrond Myklebust while (!list_empty(head)) { 24301a81bb8aSTrond Myklebust cache = list_entry(head->next, struct nfs_access_entry, lru); 24311a81bb8aSTrond Myklebust list_del(&cache->lru); 24321a81bb8aSTrond Myklebust nfs_access_free_entry(cache); 24331a81bb8aSTrond Myklebust } 24341a81bb8aSTrond Myklebust } 24351a81bb8aSTrond Myklebust 24363a505845STrond Myklebust static unsigned long 24373a505845STrond Myklebust nfs_do_access_cache_scan(unsigned int nr_to_scan) 2438979df72eSTrond Myklebust { 2439979df72eSTrond Myklebust LIST_HEAD(head); 2440aa510da5STrond Myklebust struct nfs_inode *nfsi, *next; 2441979df72eSTrond Myklebust struct nfs_access_entry *cache; 24421ab6c499SDave Chinner long freed = 0; 2443979df72eSTrond Myklebust 2444a50f7951STrond Myklebust spin_lock(&nfs_access_lru_lock); 2445aa510da5STrond Myklebust list_for_each_entry_safe(nfsi, next, &nfs_access_lru_list, access_cache_inode_lru) { 2446979df72eSTrond Myklebust struct inode *inode; 2447979df72eSTrond Myklebust 2448979df72eSTrond Myklebust if (nr_to_scan-- == 0) 2449979df72eSTrond Myklebust break; 24509c7e7e23STrond Myklebust inode = &nfsi->vfs_inode; 2451979df72eSTrond Myklebust spin_lock(&inode->i_lock); 2452979df72eSTrond Myklebust if (list_empty(&nfsi->access_cache_entry_lru)) 2453979df72eSTrond Myklebust goto remove_lru_entry; 2454979df72eSTrond Myklebust cache = list_entry(nfsi->access_cache_entry_lru.next, 2455979df72eSTrond Myklebust struct nfs_access_entry, lru); 2456979df72eSTrond Myklebust list_move(&cache->lru, &head); 2457979df72eSTrond Myklebust rb_erase(&cache->rb_node, &nfsi->access_cache); 24581ab6c499SDave Chinner freed++; 2459979df72eSTrond Myklebust if (!list_empty(&nfsi->access_cache_entry_lru)) 2460979df72eSTrond Myklebust list_move_tail(&nfsi->access_cache_inode_lru, 2461979df72eSTrond Myklebust &nfs_access_lru_list); 2462979df72eSTrond Myklebust else { 2463979df72eSTrond Myklebust remove_lru_entry: 2464979df72eSTrond Myklebust list_del_init(&nfsi->access_cache_inode_lru); 24654e857c58SPeter Zijlstra smp_mb__before_atomic(); 2466979df72eSTrond Myklebust clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); 24674e857c58SPeter Zijlstra smp_mb__after_atomic(); 2468979df72eSTrond Myklebust } 246959844a9bSTrond Myklebust spin_unlock(&inode->i_lock); 2470979df72eSTrond Myklebust } 2471979df72eSTrond Myklebust spin_unlock(&nfs_access_lru_lock); 24721a81bb8aSTrond Myklebust nfs_access_free_list(&head); 24731ab6c499SDave Chinner return freed; 24741ab6c499SDave Chinner } 24751ab6c499SDave Chinner 24761ab6c499SDave Chinner unsigned long 24773a505845STrond Myklebust nfs_access_cache_scan(struct shrinker *shrink, struct shrink_control *sc) 24783a505845STrond Myklebust { 24793a505845STrond Myklebust int nr_to_scan = sc->nr_to_scan; 24803a505845STrond Myklebust gfp_t gfp_mask = sc->gfp_mask; 24813a505845STrond Myklebust 24823a505845STrond Myklebust if ((gfp_mask & GFP_KERNEL) != GFP_KERNEL) 24833a505845STrond Myklebust return SHRINK_STOP; 24843a505845STrond Myklebust return nfs_do_access_cache_scan(nr_to_scan); 24853a505845STrond Myklebust } 24863a505845STrond Myklebust 24873a505845STrond Myklebust 24883a505845STrond Myklebust unsigned long 24891ab6c499SDave Chinner nfs_access_cache_count(struct shrinker *shrink, struct shrink_control *sc) 24901ab6c499SDave Chinner { 249155f841ceSGlauber Costa return vfs_pressure_ratio(atomic_long_read(&nfs_access_nr_entries)); 2492979df72eSTrond Myklebust } 2493979df72eSTrond Myklebust 24943a505845STrond Myklebust static void 24953a505845STrond Myklebust nfs_access_cache_enforce_limit(void) 24963a505845STrond Myklebust { 24973a505845STrond Myklebust long nr_entries = atomic_long_read(&nfs_access_nr_entries); 24983a505845STrond Myklebust unsigned long diff; 24993a505845STrond Myklebust unsigned int nr_to_scan; 25003a505845STrond Myklebust 25013a505845STrond Myklebust if (nr_entries < 0 || nr_entries <= nfs_access_max_cachesize) 25023a505845STrond Myklebust return; 25033a505845STrond Myklebust nr_to_scan = 100; 25043a505845STrond Myklebust diff = nr_entries - nfs_access_max_cachesize; 25053a505845STrond Myklebust if (diff < nr_to_scan) 25063a505845STrond Myklebust nr_to_scan = diff; 25073a505845STrond Myklebust nfs_do_access_cache_scan(nr_to_scan); 25083a505845STrond Myklebust } 25093a505845STrond Myklebust 25101a81bb8aSTrond Myklebust static void __nfs_access_zap_cache(struct nfs_inode *nfsi, struct list_head *head) 25111c3c07e9STrond Myklebust { 25121c3c07e9STrond Myklebust struct rb_root *root_node = &nfsi->access_cache; 25131a81bb8aSTrond Myklebust struct rb_node *n; 25141c3c07e9STrond Myklebust struct nfs_access_entry *entry; 25151c3c07e9STrond Myklebust 25161c3c07e9STrond Myklebust /* Unhook entries from the cache */ 25171c3c07e9STrond Myklebust while ((n = rb_first(root_node)) != NULL) { 25181c3c07e9STrond Myklebust entry = rb_entry(n, struct nfs_access_entry, rb_node); 25191c3c07e9STrond Myklebust rb_erase(n, root_node); 25201a81bb8aSTrond Myklebust list_move(&entry->lru, head); 25211c3c07e9STrond Myklebust } 25221c3c07e9STrond Myklebust nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; 25231c3c07e9STrond Myklebust } 25241c3c07e9STrond Myklebust 25251c3c07e9STrond Myklebust void nfs_access_zap_cache(struct inode *inode) 25261c3c07e9STrond Myklebust { 25271a81bb8aSTrond Myklebust LIST_HEAD(head); 25281a81bb8aSTrond Myklebust 25291a81bb8aSTrond Myklebust if (test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags) == 0) 25301a81bb8aSTrond Myklebust return; 2531cfcea3e8STrond Myklebust /* Remove from global LRU init */ 2532cfcea3e8STrond Myklebust spin_lock(&nfs_access_lru_lock); 25331a81bb8aSTrond Myklebust if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) 2534cfcea3e8STrond Myklebust list_del_init(&NFS_I(inode)->access_cache_inode_lru); 2535cfcea3e8STrond Myklebust 25361c3c07e9STrond Myklebust spin_lock(&inode->i_lock); 25371a81bb8aSTrond Myklebust __nfs_access_zap_cache(NFS_I(inode), &head); 25381a81bb8aSTrond Myklebust spin_unlock(&inode->i_lock); 25391a81bb8aSTrond Myklebust spin_unlock(&nfs_access_lru_lock); 25401a81bb8aSTrond Myklebust nfs_access_free_list(&head); 25411c3c07e9STrond Myklebust } 25421c606fb7SBryan Schumaker EXPORT_SYMBOL_GPL(nfs_access_zap_cache); 25431c3c07e9STrond Myklebust 2544b68572e0SNeilBrown static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, const struct cred *cred) 25451c3c07e9STrond Myklebust { 25461c3c07e9STrond Myklebust struct rb_node *n = NFS_I(inode)->access_cache.rb_node; 25471c3c07e9STrond Myklebust 25481c3c07e9STrond Myklebust while (n != NULL) { 2549b68572e0SNeilBrown struct nfs_access_entry *entry = 2550b68572e0SNeilBrown rb_entry(n, struct nfs_access_entry, rb_node); 2551b68572e0SNeilBrown int cmp = cred_fscmp(cred, entry->cred); 25521c3c07e9STrond Myklebust 2553b68572e0SNeilBrown if (cmp < 0) 25541c3c07e9STrond Myklebust n = n->rb_left; 2555b68572e0SNeilBrown else if (cmp > 0) 25561c3c07e9STrond Myklebust n = n->rb_right; 25571c3c07e9STrond Myklebust else 25581c3c07e9STrond Myklebust return entry; 25591c3c07e9STrond Myklebust } 25601c3c07e9STrond Myklebust return NULL; 25611c3c07e9STrond Myklebust } 25621c3c07e9STrond Myklebust 2563d2ae4f8bSFrank 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) 25641da177e4SLinus Torvalds { 256555296809SChuck Lever struct nfs_inode *nfsi = NFS_I(inode); 25661c3c07e9STrond Myklebust struct nfs_access_entry *cache; 256757b69181STrond Myklebust bool retry = true; 256857b69181STrond Myklebust int err; 25691da177e4SLinus Torvalds 25701c3c07e9STrond Myklebust spin_lock(&inode->i_lock); 257157b69181STrond Myklebust for(;;) { 25721c3c07e9STrond Myklebust if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) 25731c3c07e9STrond Myklebust goto out_zap; 25741c3c07e9STrond Myklebust cache = nfs_access_search_rbtree(inode, cred); 257557b69181STrond Myklebust err = -ENOENT; 25761c3c07e9STrond Myklebust if (cache == NULL) 25771c3c07e9STrond Myklebust goto out; 257857b69181STrond Myklebust /* Found an entry, is our attribute cache valid? */ 257921c3ba7eSTrond Myklebust if (!nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) 258057b69181STrond Myklebust break; 25815c965db8STrond Myklebust if (!retry) 25825c965db8STrond Myklebust break; 258357b69181STrond Myklebust err = -ECHILD; 258457b69181STrond Myklebust if (!may_block) 258557b69181STrond Myklebust goto out; 258657b69181STrond Myklebust spin_unlock(&inode->i_lock); 258757b69181STrond Myklebust err = __nfs_revalidate_inode(NFS_SERVER(inode), inode); 258857b69181STrond Myklebust if (err) 258957b69181STrond Myklebust return err; 259057b69181STrond Myklebust spin_lock(&inode->i_lock); 259157b69181STrond Myklebust retry = false; 259257b69181STrond Myklebust } 25931c3c07e9STrond Myklebust res->cred = cache->cred; 25941c3c07e9STrond Myklebust res->mask = cache->mask; 2595cfcea3e8STrond Myklebust list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); 25961c3c07e9STrond Myklebust err = 0; 25971c3c07e9STrond Myklebust out: 25981c3c07e9STrond Myklebust spin_unlock(&inode->i_lock); 25991c3c07e9STrond Myklebust return err; 26001c3c07e9STrond Myklebust out_zap: 26011a81bb8aSTrond Myklebust spin_unlock(&inode->i_lock); 26021a81bb8aSTrond Myklebust nfs_access_zap_cache(inode); 26031c3c07e9STrond Myklebust return -ENOENT; 26041c3c07e9STrond Myklebust } 26051c3c07e9STrond Myklebust 2606b68572e0SNeilBrown static int nfs_access_get_cached_rcu(struct inode *inode, const struct cred *cred, struct nfs_access_entry *res) 2607f682a398SNeilBrown { 2608f682a398SNeilBrown /* Only check the most recently returned cache entry, 2609f682a398SNeilBrown * but do it without locking. 2610f682a398SNeilBrown */ 2611f682a398SNeilBrown struct nfs_inode *nfsi = NFS_I(inode); 2612f682a398SNeilBrown struct nfs_access_entry *cache; 2613f682a398SNeilBrown int err = -ECHILD; 2614f682a398SNeilBrown struct list_head *lh; 2615f682a398SNeilBrown 2616f682a398SNeilBrown rcu_read_lock(); 2617f682a398SNeilBrown if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) 2618f682a398SNeilBrown goto out; 26199f01eb5dSMadhuparna Bhowmik lh = rcu_dereference(list_tail_rcu(&nfsi->access_cache_entry_lru)); 2620f682a398SNeilBrown cache = list_entry(lh, struct nfs_access_entry, lru); 2621f682a398SNeilBrown if (lh == &nfsi->access_cache_entry_lru || 26229a206de2STrond Myklebust cred_fscmp(cred, cache->cred) != 0) 2623f682a398SNeilBrown cache = NULL; 2624f682a398SNeilBrown if (cache == NULL) 2625f682a398SNeilBrown goto out; 262621c3ba7eSTrond Myklebust if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_ACCESS)) 2627f682a398SNeilBrown goto out; 2628f682a398SNeilBrown res->cred = cache->cred; 2629f682a398SNeilBrown res->mask = cache->mask; 263021c3ba7eSTrond Myklebust err = 0; 2631f682a398SNeilBrown out: 2632f682a398SNeilBrown rcu_read_unlock(); 2633f682a398SNeilBrown return err; 2634f682a398SNeilBrown } 2635f682a398SNeilBrown 2636d2ae4f8bSFrank van der Linden int nfs_access_get_cached(struct inode *inode, const struct cred *cred, struct 2637d2ae4f8bSFrank van der Linden nfs_access_entry *res, bool may_block) 2638d2ae4f8bSFrank van der Linden { 2639d2ae4f8bSFrank van der Linden int status; 2640d2ae4f8bSFrank van der Linden 2641d2ae4f8bSFrank van der Linden status = nfs_access_get_cached_rcu(inode, cred, res); 2642d2ae4f8bSFrank van der Linden if (status != 0) 2643d2ae4f8bSFrank van der Linden status = nfs_access_get_cached_locked(inode, cred, res, 2644d2ae4f8bSFrank van der Linden may_block); 2645d2ae4f8bSFrank van der Linden 2646d2ae4f8bSFrank van der Linden return status; 2647d2ae4f8bSFrank van der Linden } 2648d2ae4f8bSFrank van der Linden EXPORT_SYMBOL_GPL(nfs_access_get_cached); 2649d2ae4f8bSFrank van der Linden 26501c3c07e9STrond Myklebust static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) 26511c3c07e9STrond Myklebust { 2652cfcea3e8STrond Myklebust struct nfs_inode *nfsi = NFS_I(inode); 2653cfcea3e8STrond Myklebust struct rb_root *root_node = &nfsi->access_cache; 26541c3c07e9STrond Myklebust struct rb_node **p = &root_node->rb_node; 26551c3c07e9STrond Myklebust struct rb_node *parent = NULL; 26561c3c07e9STrond Myklebust struct nfs_access_entry *entry; 2657b68572e0SNeilBrown int cmp; 26581c3c07e9STrond Myklebust 26591c3c07e9STrond Myklebust spin_lock(&inode->i_lock); 26601c3c07e9STrond Myklebust while (*p != NULL) { 26611c3c07e9STrond Myklebust parent = *p; 26621c3c07e9STrond Myklebust entry = rb_entry(parent, struct nfs_access_entry, rb_node); 2663b68572e0SNeilBrown cmp = cred_fscmp(set->cred, entry->cred); 26641c3c07e9STrond Myklebust 2665b68572e0SNeilBrown if (cmp < 0) 26661c3c07e9STrond Myklebust p = &parent->rb_left; 2667b68572e0SNeilBrown else if (cmp > 0) 26681c3c07e9STrond Myklebust p = &parent->rb_right; 26691c3c07e9STrond Myklebust else 26701c3c07e9STrond Myklebust goto found; 26711c3c07e9STrond Myklebust } 26721c3c07e9STrond Myklebust rb_link_node(&set->rb_node, parent, p); 26731c3c07e9STrond Myklebust rb_insert_color(&set->rb_node, root_node); 2674cfcea3e8STrond Myklebust list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); 26751c3c07e9STrond Myklebust spin_unlock(&inode->i_lock); 26761c3c07e9STrond Myklebust return; 26771c3c07e9STrond Myklebust found: 26781c3c07e9STrond Myklebust rb_replace_node(parent, &set->rb_node, root_node); 2679cfcea3e8STrond Myklebust list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); 2680cfcea3e8STrond Myklebust list_del(&entry->lru); 26811c3c07e9STrond Myklebust spin_unlock(&inode->i_lock); 26821c3c07e9STrond Myklebust nfs_access_free_entry(entry); 26831da177e4SLinus Torvalds } 26841da177e4SLinus Torvalds 26856168f62cSWeston Andros Adamson void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) 26861da177e4SLinus Torvalds { 26871c3c07e9STrond Myklebust struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); 26881c3c07e9STrond Myklebust if (cache == NULL) 26891c3c07e9STrond Myklebust return; 26901c3c07e9STrond Myklebust RB_CLEAR_NODE(&cache->rb_node); 2691b68572e0SNeilBrown cache->cred = get_cred(set->cred); 26921da177e4SLinus Torvalds cache->mask = set->mask; 26931c3c07e9STrond Myklebust 2694f682a398SNeilBrown /* The above field assignments must be visible 2695f682a398SNeilBrown * before this item appears on the lru. We cannot easily 2696f682a398SNeilBrown * use rcu_assign_pointer, so just force the memory barrier. 2697f682a398SNeilBrown */ 2698f682a398SNeilBrown smp_wmb(); 26991c3c07e9STrond Myklebust nfs_access_add_rbtree(inode, cache); 2700cfcea3e8STrond Myklebust 2701cfcea3e8STrond Myklebust /* Update accounting */ 27024e857c58SPeter Zijlstra smp_mb__before_atomic(); 2703cfcea3e8STrond Myklebust atomic_long_inc(&nfs_access_nr_entries); 27044e857c58SPeter Zijlstra smp_mb__after_atomic(); 2705cfcea3e8STrond Myklebust 2706cfcea3e8STrond Myklebust /* Add inode to global LRU list */ 27071a81bb8aSTrond Myklebust if (!test_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) { 2708cfcea3e8STrond Myklebust spin_lock(&nfs_access_lru_lock); 27091a81bb8aSTrond Myklebust if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_I(inode)->flags)) 27101a81bb8aSTrond Myklebust list_add_tail(&NFS_I(inode)->access_cache_inode_lru, 27111a81bb8aSTrond Myklebust &nfs_access_lru_list); 2712cfcea3e8STrond Myklebust spin_unlock(&nfs_access_lru_lock); 2713cfcea3e8STrond Myklebust } 27143a505845STrond Myklebust nfs_access_cache_enforce_limit(); 27151da177e4SLinus Torvalds } 27166168f62cSWeston Andros Adamson EXPORT_SYMBOL_GPL(nfs_access_add_cache); 27176168f62cSWeston Andros Adamson 27183c181827SAnna Schumaker #define NFS_MAY_READ (NFS_ACCESS_READ) 27193c181827SAnna Schumaker #define NFS_MAY_WRITE (NFS_ACCESS_MODIFY | \ 27203c181827SAnna Schumaker NFS_ACCESS_EXTEND | \ 27213c181827SAnna Schumaker NFS_ACCESS_DELETE) 27223c181827SAnna Schumaker #define NFS_FILE_MAY_WRITE (NFS_ACCESS_MODIFY | \ 27233c181827SAnna Schumaker NFS_ACCESS_EXTEND) 2724ecbb903cSTrond Myklebust #define NFS_DIR_MAY_WRITE NFS_MAY_WRITE 27253c181827SAnna Schumaker #define NFS_MAY_LOOKUP (NFS_ACCESS_LOOKUP) 27263c181827SAnna Schumaker #define NFS_MAY_EXECUTE (NFS_ACCESS_EXECUTE) 272715d4b73aSTrond Myklebust static int 2728ecbb903cSTrond Myklebust nfs_access_calc_mask(u32 access_result, umode_t umode) 272915d4b73aSTrond Myklebust { 273015d4b73aSTrond Myklebust int mask = 0; 273115d4b73aSTrond Myklebust 273215d4b73aSTrond Myklebust if (access_result & NFS_MAY_READ) 273315d4b73aSTrond Myklebust mask |= MAY_READ; 2734ecbb903cSTrond Myklebust if (S_ISDIR(umode)) { 2735ecbb903cSTrond Myklebust if ((access_result & NFS_DIR_MAY_WRITE) == NFS_DIR_MAY_WRITE) 273615d4b73aSTrond Myklebust mask |= MAY_WRITE; 2737ecbb903cSTrond Myklebust if ((access_result & NFS_MAY_LOOKUP) == NFS_MAY_LOOKUP) 273815d4b73aSTrond Myklebust mask |= MAY_EXEC; 2739ecbb903cSTrond Myklebust } else if (S_ISREG(umode)) { 2740ecbb903cSTrond Myklebust if ((access_result & NFS_FILE_MAY_WRITE) == NFS_FILE_MAY_WRITE) 2741ecbb903cSTrond Myklebust mask |= MAY_WRITE; 2742ecbb903cSTrond Myklebust if ((access_result & NFS_MAY_EXECUTE) == NFS_MAY_EXECUTE) 274315d4b73aSTrond Myklebust mask |= MAY_EXEC; 2744ecbb903cSTrond Myklebust } else if (access_result & NFS_MAY_WRITE) 2745ecbb903cSTrond Myklebust mask |= MAY_WRITE; 274615d4b73aSTrond Myklebust return mask; 274715d4b73aSTrond Myklebust } 274815d4b73aSTrond Myklebust 27496168f62cSWeston Andros Adamson void nfs_access_set_mask(struct nfs_access_entry *entry, u32 access_result) 27506168f62cSWeston Andros Adamson { 2751bd8b2441STrond Myklebust entry->mask = access_result; 27526168f62cSWeston Andros Adamson } 27536168f62cSWeston Andros Adamson EXPORT_SYMBOL_GPL(nfs_access_set_mask); 27541da177e4SLinus Torvalds 2755b68572e0SNeilBrown static int nfs_do_access(struct inode *inode, const struct cred *cred, int mask) 27561da177e4SLinus Torvalds { 27571da177e4SLinus Torvalds struct nfs_access_entry cache; 275857b69181STrond Myklebust bool may_block = (mask & MAY_NOT_BLOCK) == 0; 2759e8194b7dSTrond Myklebust int cache_mask = -1; 27601da177e4SLinus Torvalds int status; 27611da177e4SLinus Torvalds 2762f4ce1299STrond Myklebust trace_nfs_access_enter(inode); 2763f4ce1299STrond Myklebust 276457b69181STrond Myklebust status = nfs_access_get_cached(inode, cred, &cache, may_block); 27651da177e4SLinus Torvalds if (status == 0) 2766f4ce1299STrond Myklebust goto out_cached; 27671da177e4SLinus Torvalds 2768f3324a2aSNeilBrown status = -ECHILD; 276957b69181STrond Myklebust if (!may_block) 2770f3324a2aSNeilBrown goto out; 2771f3324a2aSNeilBrown 27721750d929SAnna Schumaker /* 27731750d929SAnna Schumaker * Determine which access bits we want to ask for... 27741750d929SAnna Schumaker */ 27751750d929SAnna Schumaker cache.mask = NFS_ACCESS_READ | NFS_ACCESS_MODIFY | NFS_ACCESS_EXTEND; 277672832a24SFrank van der Linden if (nfs_server_capable(inode, NFS_CAP_XATTR)) { 277772832a24SFrank van der Linden cache.mask |= NFS_ACCESS_XAREAD | NFS_ACCESS_XAWRITE | 277872832a24SFrank van der Linden NFS_ACCESS_XALIST; 277972832a24SFrank van der Linden } 27801750d929SAnna Schumaker if (S_ISDIR(inode->i_mode)) 27811750d929SAnna Schumaker cache.mask |= NFS_ACCESS_DELETE | NFS_ACCESS_LOOKUP; 27821750d929SAnna Schumaker else 27831750d929SAnna Schumaker cache.mask |= NFS_ACCESS_EXECUTE; 27841da177e4SLinus Torvalds cache.cred = cred; 27851da177e4SLinus Torvalds status = NFS_PROTO(inode)->access(inode, &cache); 2786a71ee337SSuresh Jayaraman if (status != 0) { 2787a71ee337SSuresh Jayaraman if (status == -ESTALE) { 2788a71ee337SSuresh Jayaraman if (!S_ISDIR(inode->i_mode)) 278993ce4af7STrond Myklebust nfs_set_inode_stale(inode); 279093ce4af7STrond Myklebust else 279193ce4af7STrond Myklebust nfs_zap_caches(inode); 2792a71ee337SSuresh Jayaraman } 2793f4ce1299STrond Myklebust goto out; 2794a71ee337SSuresh Jayaraman } 27951da177e4SLinus Torvalds nfs_access_add_cache(inode, &cache); 2796f4ce1299STrond Myklebust out_cached: 2797ecbb903cSTrond Myklebust cache_mask = nfs_access_calc_mask(cache.mask, inode->i_mode); 2798bd8b2441STrond Myklebust if ((mask & ~cache_mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) != 0) 2799f4ce1299STrond Myklebust status = -EACCES; 28001da177e4SLinus Torvalds out: 2801e8194b7dSTrond Myklebust trace_nfs_access_exit(inode, mask, cache_mask, status); 2802f4ce1299STrond Myklebust return status; 28031da177e4SLinus Torvalds } 28041da177e4SLinus Torvalds 2805af22f94aSTrond Myklebust static int nfs_open_permission_mask(int openflags) 2806af22f94aSTrond Myklebust { 2807af22f94aSTrond Myklebust int mask = 0; 2808af22f94aSTrond Myklebust 2809f8d9a897SWeston Andros Adamson if (openflags & __FMODE_EXEC) { 2810f8d9a897SWeston Andros Adamson /* ONLY check exec rights */ 2811f8d9a897SWeston Andros Adamson mask = MAY_EXEC; 2812f8d9a897SWeston Andros Adamson } else { 28138a5e929dSAl Viro if ((openflags & O_ACCMODE) != O_WRONLY) 2814af22f94aSTrond Myklebust mask |= MAY_READ; 28158a5e929dSAl Viro if ((openflags & O_ACCMODE) != O_RDONLY) 2816af22f94aSTrond Myklebust mask |= MAY_WRITE; 2817f8d9a897SWeston Andros Adamson } 2818f8d9a897SWeston Andros Adamson 2819af22f94aSTrond Myklebust return mask; 2820af22f94aSTrond Myklebust } 2821af22f94aSTrond Myklebust 2822b68572e0SNeilBrown int nfs_may_open(struct inode *inode, const struct cred *cred, int openflags) 2823af22f94aSTrond Myklebust { 2824af22f94aSTrond Myklebust return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); 2825af22f94aSTrond Myklebust } 282689d77c8fSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_may_open); 2827af22f94aSTrond Myklebust 28285c5fc09aSTrond Myklebust static int nfs_execute_ok(struct inode *inode, int mask) 28295c5fc09aSTrond Myklebust { 28305c5fc09aSTrond Myklebust struct nfs_server *server = NFS_SERVER(inode); 283121c3ba7eSTrond Myklebust int ret = 0; 28325c5fc09aSTrond Myklebust 28333825827eSTrond Myklebust if (S_ISDIR(inode->i_mode)) 28343825827eSTrond Myklebust return 0; 2835cf834027STrond Myklebust if (nfs_check_cache_invalid(inode, NFS_INO_INVALID_OTHER)) { 28365c5fc09aSTrond Myklebust if (mask & MAY_NOT_BLOCK) 283721c3ba7eSTrond Myklebust return -ECHILD; 283821c3ba7eSTrond Myklebust ret = __nfs_revalidate_inode(server, inode); 283921c3ba7eSTrond Myklebust } 28405c5fc09aSTrond Myklebust if (ret == 0 && !execute_ok(inode)) 28415c5fc09aSTrond Myklebust ret = -EACCES; 28425c5fc09aSTrond Myklebust return ret; 28435c5fc09aSTrond Myklebust } 28445c5fc09aSTrond Myklebust 284510556cb2SAl Viro int nfs_permission(struct inode *inode, int mask) 28461da177e4SLinus Torvalds { 2847b68572e0SNeilBrown const struct cred *cred = current_cred(); 28481da177e4SLinus Torvalds int res = 0; 28491da177e4SLinus Torvalds 285091d5b470SChuck Lever nfs_inc_stats(inode, NFSIOS_VFSACCESS); 285191d5b470SChuck Lever 2852e6305c43SAl Viro if ((mask & (MAY_READ | MAY_WRITE | MAY_EXEC)) == 0) 28531da177e4SLinus Torvalds goto out; 28541da177e4SLinus Torvalds /* Is this sys_access() ? */ 28559cfcac81SEric Paris if (mask & (MAY_ACCESS | MAY_CHDIR)) 28561da177e4SLinus Torvalds goto force_lookup; 28571da177e4SLinus Torvalds 28581da177e4SLinus Torvalds switch (inode->i_mode & S_IFMT) { 28591da177e4SLinus Torvalds case S_IFLNK: 28601da177e4SLinus Torvalds goto out; 28611da177e4SLinus Torvalds case S_IFREG: 2862762674f8STrond Myklebust if ((mask & MAY_OPEN) && 2863762674f8STrond Myklebust nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN)) 2864762674f8STrond Myklebust return 0; 28651da177e4SLinus Torvalds break; 28661da177e4SLinus Torvalds case S_IFDIR: 28671da177e4SLinus Torvalds /* 28681da177e4SLinus Torvalds * Optimize away all write operations, since the server 28691da177e4SLinus Torvalds * will check permissions when we perform the op. 28701da177e4SLinus Torvalds */ 28711da177e4SLinus Torvalds if ((mask & MAY_WRITE) && !(mask & MAY_READ)) 28721da177e4SLinus Torvalds goto out; 28731da177e4SLinus Torvalds } 28741da177e4SLinus Torvalds 28751da177e4SLinus Torvalds force_lookup: 28761da177e4SLinus Torvalds if (!NFS_PROTO(inode)->access) 28771da177e4SLinus Torvalds goto out_notsup; 28781da177e4SLinus Torvalds 28791da177e4SLinus Torvalds res = nfs_do_access(inode, cred, mask); 28801da177e4SLinus Torvalds out: 28815c5fc09aSTrond Myklebust if (!res && (mask & MAY_EXEC)) 28825c5fc09aSTrond Myklebust res = nfs_execute_ok(inode, mask); 2883f696a365SMiklos Szeredi 28841e8968c5SNiels de Vos dfprintk(VFS, "NFS: permission(%s/%lu), mask=0x%x, res=%d\n", 28851e7cb3dcSChuck Lever inode->i_sb->s_id, inode->i_ino, mask, res); 28861da177e4SLinus Torvalds return res; 28871da177e4SLinus Torvalds out_notsup: 2888d51ac1a8SNeilBrown if (mask & MAY_NOT_BLOCK) 2889d51ac1a8SNeilBrown return -ECHILD; 2890d51ac1a8SNeilBrown 28911da177e4SLinus Torvalds res = nfs_revalidate_inode(NFS_SERVER(inode), inode); 28921da177e4SLinus Torvalds if (res == 0) 28932830ba7fSAl Viro res = generic_permission(inode, mask); 28941e7cb3dcSChuck Lever goto out; 28951da177e4SLinus Torvalds } 2896ddda8e0aSBryan Schumaker EXPORT_SYMBOL_GPL(nfs_permission); 28971da177e4SLinus Torvalds 28981da177e4SLinus Torvalds /* 28991da177e4SLinus Torvalds * Local variables: 29001da177e4SLinus Torvalds * version-control: t 29011da177e4SLinus Torvalds * kept-new-versions: 5 29021da177e4SLinus Torvalds * End: 29031da177e4SLinus Torvalds */ 2904