Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/nfs/dir.c |
| 3 | * |
| 4 | * Copyright (C) 1992 Rick Sladkey |
| 5 | * |
| 6 | * nfs directory handling functions |
| 7 | * |
| 8 | * 10 Apr 1996 Added silly rename for unlink --okir |
| 9 | * 28 Sep 1996 Improved directory cache --okir |
| 10 | * 23 Aug 1997 Claus Heine claus@momo.math.rwth-aachen.de |
| 11 | * Re-implemented silly rename for unlink, newly implemented |
| 12 | * silly rename for nfs_rename() following the suggestions |
| 13 | * of Olaf Kirch (okir) found in this file. |
| 14 | * Following Linus comments on my original hack, this version |
| 15 | * depends only on the dcache stuff and doesn't touch the inode |
| 16 | * layer (iput() and friends). |
| 17 | * 6 Jun 1999 Cache readdir lookups in the page cache. -DaveM |
| 18 | */ |
| 19 | |
| 20 | #include <linux/time.h> |
| 21 | #include <linux/errno.h> |
| 22 | #include <linux/stat.h> |
| 23 | #include <linux/fcntl.h> |
| 24 | #include <linux/string.h> |
| 25 | #include <linux/kernel.h> |
| 26 | #include <linux/slab.h> |
| 27 | #include <linux/mm.h> |
| 28 | #include <linux/sunrpc/clnt.h> |
| 29 | #include <linux/nfs_fs.h> |
| 30 | #include <linux/nfs_mount.h> |
| 31 | #include <linux/pagemap.h> |
| 32 | #include <linux/smp_lock.h> |
| 33 | #include <linux/namei.h> |
| 34 | |
Trond Myklebust | 4ce7971 | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 35 | #include "nfs4_fs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include "delegation.h" |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 37 | #include "iostat.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
| 39 | #define NFS_PARANOIA 1 |
| 40 | /* #define NFS_DEBUG_VERBOSE 1 */ |
| 41 | |
| 42 | static int nfs_opendir(struct inode *, struct file *); |
| 43 | static int nfs_readdir(struct file *, void *, filldir_t); |
| 44 | static struct dentry *nfs_lookup(struct inode *, struct dentry *, struct nameidata *); |
| 45 | static int nfs_create(struct inode *, struct dentry *, int, struct nameidata *); |
| 46 | static int nfs_mkdir(struct inode *, struct dentry *, int); |
| 47 | static int nfs_rmdir(struct inode *, struct dentry *); |
| 48 | static int nfs_unlink(struct inode *, struct dentry *); |
| 49 | static int nfs_symlink(struct inode *, struct dentry *, const char *); |
| 50 | static int nfs_link(struct dentry *, struct inode *, struct dentry *); |
| 51 | static int nfs_mknod(struct inode *, struct dentry *, int, dev_t); |
| 52 | static int nfs_rename(struct inode *, struct dentry *, |
| 53 | struct inode *, struct dentry *); |
| 54 | static int nfs_fsync_dir(struct file *, struct dentry *, int); |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 55 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 57 | const struct file_operations nfs_dir_operations = { |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 58 | .llseek = nfs_llseek_dir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | .read = generic_read_dir, |
| 60 | .readdir = nfs_readdir, |
| 61 | .open = nfs_opendir, |
| 62 | .release = nfs_release, |
| 63 | .fsync = nfs_fsync_dir, |
| 64 | }; |
| 65 | |
| 66 | struct inode_operations nfs_dir_inode_operations = { |
| 67 | .create = nfs_create, |
| 68 | .lookup = nfs_lookup, |
| 69 | .link = nfs_link, |
| 70 | .unlink = nfs_unlink, |
| 71 | .symlink = nfs_symlink, |
| 72 | .mkdir = nfs_mkdir, |
| 73 | .rmdir = nfs_rmdir, |
| 74 | .mknod = nfs_mknod, |
| 75 | .rename = nfs_rename, |
| 76 | .permission = nfs_permission, |
| 77 | .getattr = nfs_getattr, |
| 78 | .setattr = nfs_setattr, |
| 79 | }; |
| 80 | |
Andreas Gruenbacher | b7fa055 | 2005-06-22 17:16:27 +0000 | [diff] [blame] | 81 | #ifdef CONFIG_NFS_V3 |
| 82 | struct inode_operations nfs3_dir_inode_operations = { |
| 83 | .create = nfs_create, |
| 84 | .lookup = nfs_lookup, |
| 85 | .link = nfs_link, |
| 86 | .unlink = nfs_unlink, |
| 87 | .symlink = nfs_symlink, |
| 88 | .mkdir = nfs_mkdir, |
| 89 | .rmdir = nfs_rmdir, |
| 90 | .mknod = nfs_mknod, |
| 91 | .rename = nfs_rename, |
| 92 | .permission = nfs_permission, |
| 93 | .getattr = nfs_getattr, |
| 94 | .setattr = nfs_setattr, |
| 95 | .listxattr = nfs3_listxattr, |
| 96 | .getxattr = nfs3_getxattr, |
| 97 | .setxattr = nfs3_setxattr, |
| 98 | .removexattr = nfs3_removexattr, |
| 99 | }; |
| 100 | #endif /* CONFIG_NFS_V3 */ |
| 101 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | #ifdef CONFIG_NFS_V4 |
| 103 | |
| 104 | static struct dentry *nfs_atomic_lookup(struct inode *, struct dentry *, struct nameidata *); |
| 105 | struct inode_operations nfs4_dir_inode_operations = { |
| 106 | .create = nfs_create, |
| 107 | .lookup = nfs_atomic_lookup, |
| 108 | .link = nfs_link, |
| 109 | .unlink = nfs_unlink, |
| 110 | .symlink = nfs_symlink, |
| 111 | .mkdir = nfs_mkdir, |
| 112 | .rmdir = nfs_rmdir, |
| 113 | .mknod = nfs_mknod, |
| 114 | .rename = nfs_rename, |
| 115 | .permission = nfs_permission, |
| 116 | .getattr = nfs_getattr, |
| 117 | .setattr = nfs_setattr, |
J. Bruce Fields | 6b3b549 | 2005-06-22 17:16:22 +0000 | [diff] [blame] | 118 | .getxattr = nfs4_getxattr, |
| 119 | .setxattr = nfs4_setxattr, |
| 120 | .listxattr = nfs4_listxattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | }; |
| 122 | |
| 123 | #endif /* CONFIG_NFS_V4 */ |
| 124 | |
| 125 | /* |
| 126 | * Open file |
| 127 | */ |
| 128 | static int |
| 129 | nfs_opendir(struct inode *inode, struct file *filp) |
| 130 | { |
Carsten Otte | 7451c4f | 2006-04-19 13:06:37 -0400 | [diff] [blame^] | 131 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 133 | dfprintk(VFS, "NFS: opendir(%s/%ld)\n", |
| 134 | inode->i_sb->s_id, inode->i_ino); |
| 135 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | lock_kernel(); |
| 137 | /* Call generic open code in order to cache credentials */ |
Carsten Otte | 7451c4f | 2006-04-19 13:06:37 -0400 | [diff] [blame^] | 138 | res = nfs_open(inode, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | unlock_kernel(); |
| 140 | return res; |
| 141 | } |
| 142 | |
| 143 | typedef u32 * (*decode_dirent_t)(u32 *, struct nfs_entry *, int); |
| 144 | typedef struct { |
| 145 | struct file *file; |
| 146 | struct page *page; |
| 147 | unsigned long page_index; |
| 148 | u32 *ptr; |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 149 | u64 *dir_cookie; |
| 150 | loff_t current_index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | struct nfs_entry *entry; |
| 152 | decode_dirent_t decode; |
| 153 | int plus; |
| 154 | int error; |
| 155 | } nfs_readdir_descriptor_t; |
| 156 | |
| 157 | /* Now we cache directories properly, by stuffing the dirent |
| 158 | * data directly in the page cache. |
| 159 | * |
| 160 | * Inode invalidation due to refresh etc. takes care of |
| 161 | * _everything_, no sloppy entry flushing logic, no extraneous |
| 162 | * copying, network direct to page cache, the way it was meant |
| 163 | * to be. |
| 164 | * |
| 165 | * NOTE: Dirent information verification is done always by the |
| 166 | * page-in of the RPC reply, nowhere else, this simplies |
| 167 | * things substantially. |
| 168 | */ |
| 169 | static |
| 170 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page) |
| 171 | { |
| 172 | struct file *file = desc->file; |
| 173 | struct inode *inode = file->f_dentry->d_inode; |
| 174 | struct rpc_cred *cred = nfs_file_cred(file); |
| 175 | unsigned long timestamp; |
| 176 | int error; |
| 177 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 178 | dfprintk(DIRCACHE, "NFS: %s: reading cookie %Lu into page %lu\n", |
| 179 | __FUNCTION__, (long long)desc->entry->cookie, |
| 180 | page->index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 181 | |
| 182 | again: |
| 183 | timestamp = jiffies; |
| 184 | error = NFS_PROTO(inode)->readdir(file->f_dentry, cred, desc->entry->cookie, page, |
| 185 | NFS_SERVER(inode)->dtsize, desc->plus); |
| 186 | if (error < 0) { |
| 187 | /* We requested READDIRPLUS, but the server doesn't grok it */ |
| 188 | if (error == -ENOTSUPP && desc->plus) { |
| 189 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; |
Chuck Lever | 412d582 | 2005-08-18 11:24:11 -0700 | [diff] [blame] | 190 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | desc->plus = 0; |
| 192 | goto again; |
| 193 | } |
| 194 | goto error; |
| 195 | } |
| 196 | SetPageUptodate(page); |
Chuck Lever | dc59250 | 2005-08-18 11:24:12 -0700 | [diff] [blame] | 197 | spin_lock(&inode->i_lock); |
Chuck Lever | 5529680 | 2005-08-18 11:24:09 -0700 | [diff] [blame] | 198 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME; |
Chuck Lever | dc59250 | 2005-08-18 11:24:12 -0700 | [diff] [blame] | 199 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | /* Ensure consistent page alignment of the data. |
| 201 | * Note: assumes we have exclusive access to this mapping either |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 202 | * through inode->i_mutex or some other mechanism. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | */ |
Trond Myklebust | a656db9 | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 204 | if (page->index == 0) |
| 205 | invalidate_inode_pages2_range(inode->i_mapping, PAGE_CACHE_SIZE, -1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | unlock_page(page); |
| 207 | return 0; |
| 208 | error: |
| 209 | SetPageError(page); |
| 210 | unlock_page(page); |
| 211 | nfs_zap_caches(inode); |
| 212 | desc->error = error; |
| 213 | return -EIO; |
| 214 | } |
| 215 | |
| 216 | static inline |
| 217 | int dir_decode(nfs_readdir_descriptor_t *desc) |
| 218 | { |
| 219 | u32 *p = desc->ptr; |
| 220 | p = desc->decode(p, desc->entry, desc->plus); |
| 221 | if (IS_ERR(p)) |
| 222 | return PTR_ERR(p); |
| 223 | desc->ptr = p; |
| 224 | return 0; |
| 225 | } |
| 226 | |
| 227 | static inline |
| 228 | void dir_page_release(nfs_readdir_descriptor_t *desc) |
| 229 | { |
| 230 | kunmap(desc->page); |
| 231 | page_cache_release(desc->page); |
| 232 | desc->page = NULL; |
| 233 | desc->ptr = NULL; |
| 234 | } |
| 235 | |
| 236 | /* |
| 237 | * Given a pointer to a buffer that has already been filled by a call |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 238 | * to readdir, find the next entry with cookie '*desc->dir_cookie'. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 239 | * |
| 240 | * If the end of the buffer has been reached, return -EAGAIN, if not, |
| 241 | * return the offset within the buffer of the next entry to be |
| 242 | * read. |
| 243 | */ |
| 244 | static inline |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 245 | int find_dirent(nfs_readdir_descriptor_t *desc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | { |
| 247 | struct nfs_entry *entry = desc->entry; |
| 248 | int loop_count = 0, |
| 249 | status; |
| 250 | |
| 251 | while((status = dir_decode(desc)) == 0) { |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 252 | dfprintk(DIRCACHE, "NFS: %s: examining cookie %Lu\n", |
| 253 | __FUNCTION__, (unsigned long long)entry->cookie); |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 254 | if (entry->prev_cookie == *desc->dir_cookie) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | break; |
| 256 | if (loop_count++ > 200) { |
| 257 | loop_count = 0; |
| 258 | schedule(); |
| 259 | } |
| 260 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | return status; |
| 262 | } |
| 263 | |
| 264 | /* |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 265 | * Given a pointer to a buffer that has already been filled by a call |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 266 | * to readdir, find the entry at offset 'desc->file->f_pos'. |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 267 | * |
| 268 | * If the end of the buffer has been reached, return -EAGAIN, if not, |
| 269 | * return the offset within the buffer of the next entry to be |
| 270 | * read. |
| 271 | */ |
| 272 | static inline |
| 273 | int find_dirent_index(nfs_readdir_descriptor_t *desc) |
| 274 | { |
| 275 | struct nfs_entry *entry = desc->entry; |
| 276 | int loop_count = 0, |
| 277 | status; |
| 278 | |
| 279 | for(;;) { |
| 280 | status = dir_decode(desc); |
| 281 | if (status) |
| 282 | break; |
| 283 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 284 | dfprintk(DIRCACHE, "NFS: found cookie %Lu at index %Ld\n", |
| 285 | (unsigned long long)entry->cookie, desc->current_index); |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 286 | |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 287 | if (desc->file->f_pos == desc->current_index) { |
| 288 | *desc->dir_cookie = entry->cookie; |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 289 | break; |
| 290 | } |
| 291 | desc->current_index++; |
| 292 | if (loop_count++ > 200) { |
| 293 | loop_count = 0; |
| 294 | schedule(); |
| 295 | } |
| 296 | } |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 297 | return status; |
| 298 | } |
| 299 | |
| 300 | /* |
| 301 | * Find the given page, and call find_dirent() or find_dirent_index in |
| 302 | * order to try to return the next entry. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | */ |
| 304 | static inline |
| 305 | int find_dirent_page(nfs_readdir_descriptor_t *desc) |
| 306 | { |
| 307 | struct inode *inode = desc->file->f_dentry->d_inode; |
| 308 | struct page *page; |
| 309 | int status; |
| 310 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 311 | dfprintk(DIRCACHE, "NFS: %s: searching page %ld for target %Lu\n", |
| 312 | __FUNCTION__, desc->page_index, |
| 313 | (long long) *desc->dir_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | |
| 315 | page = read_cache_page(inode->i_mapping, desc->page_index, |
| 316 | (filler_t *)nfs_readdir_filler, desc); |
| 317 | if (IS_ERR(page)) { |
| 318 | status = PTR_ERR(page); |
| 319 | goto out; |
| 320 | } |
| 321 | if (!PageUptodate(page)) |
| 322 | goto read_error; |
| 323 | |
| 324 | /* NOTE: Someone else may have changed the READDIRPLUS flag */ |
| 325 | desc->page = page; |
| 326 | desc->ptr = kmap(page); /* matching kunmap in nfs_do_filldir */ |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 327 | if (*desc->dir_cookie != 0) |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 328 | status = find_dirent(desc); |
| 329 | else |
| 330 | status = find_dirent_index(desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | if (status < 0) |
| 332 | dir_page_release(desc); |
| 333 | out: |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 334 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __FUNCTION__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | return status; |
| 336 | read_error: |
| 337 | page_cache_release(page); |
| 338 | return -EIO; |
| 339 | } |
| 340 | |
| 341 | /* |
| 342 | * Recurse through the page cache pages, and return a |
| 343 | * filled nfs_entry structure of the next directory entry if possible. |
| 344 | * |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 345 | * The target for the search is '*desc->dir_cookie' if non-0, |
| 346 | * 'desc->file->f_pos' otherwise |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 347 | */ |
| 348 | static inline |
| 349 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) |
| 350 | { |
| 351 | int loop_count = 0; |
| 352 | int res; |
| 353 | |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 354 | /* Always search-by-index from the beginning of the cache */ |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 355 | if (*desc->dir_cookie == 0) { |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 356 | dfprintk(DIRCACHE, "NFS: readdir_search_pagecache() searching for offset %Ld\n", |
| 357 | (long long)desc->file->f_pos); |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 358 | desc->page_index = 0; |
| 359 | desc->entry->cookie = desc->entry->prev_cookie = 0; |
| 360 | desc->entry->eof = 0; |
| 361 | desc->current_index = 0; |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 362 | } else |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 363 | dfprintk(DIRCACHE, "NFS: readdir_search_pagecache() searching for cookie %Lu\n", |
| 364 | (unsigned long long)*desc->dir_cookie); |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 365 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 366 | for (;;) { |
| 367 | res = find_dirent_page(desc); |
| 368 | if (res != -EAGAIN) |
| 369 | break; |
| 370 | /* Align to beginning of next page */ |
| 371 | desc->page_index ++; |
| 372 | if (loop_count++ > 200) { |
| 373 | loop_count = 0; |
| 374 | schedule(); |
| 375 | } |
| 376 | } |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 377 | |
| 378 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __FUNCTION__, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 379 | return res; |
| 380 | } |
| 381 | |
| 382 | static inline unsigned int dt_type(struct inode *inode) |
| 383 | { |
| 384 | return (inode->i_mode >> 12) & 15; |
| 385 | } |
| 386 | |
| 387 | static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc); |
| 388 | |
| 389 | /* |
| 390 | * Once we've found the start of the dirent within a page: fill 'er up... |
| 391 | */ |
| 392 | static |
| 393 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, |
| 394 | filldir_t filldir) |
| 395 | { |
| 396 | struct file *file = desc->file; |
| 397 | struct nfs_entry *entry = desc->entry; |
| 398 | struct dentry *dentry = NULL; |
| 399 | unsigned long fileid; |
| 400 | int loop_count = 0, |
| 401 | res; |
| 402 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 403 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling starting @ cookie %Lu\n", |
| 404 | (unsigned long long)entry->cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 405 | |
| 406 | for(;;) { |
| 407 | unsigned d_type = DT_UNKNOWN; |
| 408 | /* Note: entry->prev_cookie contains the cookie for |
| 409 | * retrieving the current dirent on the server */ |
| 410 | fileid = nfs_fileid_to_ino_t(entry->ino); |
| 411 | |
| 412 | /* Get a dentry if we have one */ |
| 413 | if (dentry != NULL) |
| 414 | dput(dentry); |
| 415 | dentry = nfs_readdir_lookup(desc); |
| 416 | |
| 417 | /* Use readdirplus info */ |
| 418 | if (dentry != NULL && dentry->d_inode != NULL) { |
| 419 | d_type = dt_type(dentry->d_inode); |
| 420 | fileid = dentry->d_inode->i_ino; |
| 421 | } |
| 422 | |
| 423 | res = filldir(dirent, entry->name, entry->len, |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 424 | file->f_pos, fileid, d_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | if (res < 0) |
| 426 | break; |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 427 | file->f_pos++; |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 428 | *desc->dir_cookie = entry->cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | if (dir_decode(desc) != 0) { |
| 430 | desc->page_index ++; |
| 431 | break; |
| 432 | } |
| 433 | if (loop_count++ > 200) { |
| 434 | loop_count = 0; |
| 435 | schedule(); |
| 436 | } |
| 437 | } |
| 438 | dir_page_release(desc); |
| 439 | if (dentry != NULL) |
| 440 | dput(dentry); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 441 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
| 442 | (unsigned long long)*desc->dir_cookie, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | return res; |
| 444 | } |
| 445 | |
| 446 | /* |
| 447 | * If we cannot find a cookie in our cache, we suspect that this is |
| 448 | * because it points to a deleted file, so we ask the server to return |
| 449 | * whatever it thinks is the next entry. We then feed this to filldir. |
| 450 | * If all goes well, we should then be able to find our way round the |
| 451 | * cache on the next call to readdir_search_pagecache(); |
| 452 | * |
| 453 | * NOTE: we cannot add the anonymous page to the pagecache because |
| 454 | * the data it contains might not be page aligned. Besides, |
| 455 | * we should already have a complete representation of the |
| 456 | * directory in the page cache by the time we get here. |
| 457 | */ |
| 458 | static inline |
| 459 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, |
| 460 | filldir_t filldir) |
| 461 | { |
| 462 | struct file *file = desc->file; |
| 463 | struct inode *inode = file->f_dentry->d_inode; |
| 464 | struct rpc_cred *cred = nfs_file_cred(file); |
| 465 | struct page *page = NULL; |
| 466 | int status; |
| 467 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 468 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
| 469 | (unsigned long long)*desc->dir_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 470 | |
| 471 | page = alloc_page(GFP_HIGHUSER); |
| 472 | if (!page) { |
| 473 | status = -ENOMEM; |
| 474 | goto out; |
| 475 | } |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 476 | desc->error = NFS_PROTO(inode)->readdir(file->f_dentry, cred, *desc->dir_cookie, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | page, |
| 478 | NFS_SERVER(inode)->dtsize, |
| 479 | desc->plus); |
Chuck Lever | dc59250 | 2005-08-18 11:24:12 -0700 | [diff] [blame] | 480 | spin_lock(&inode->i_lock); |
Chuck Lever | 5529680 | 2005-08-18 11:24:09 -0700 | [diff] [blame] | 481 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME; |
Chuck Lever | dc59250 | 2005-08-18 11:24:12 -0700 | [diff] [blame] | 482 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | desc->page = page; |
| 484 | desc->ptr = kmap(page); /* matching kunmap in nfs_do_filldir */ |
| 485 | if (desc->error >= 0) { |
| 486 | if ((status = dir_decode(desc)) == 0) |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 487 | desc->entry->prev_cookie = *desc->dir_cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | } else |
| 489 | status = -EIO; |
| 490 | if (status < 0) |
| 491 | goto out_release; |
| 492 | |
| 493 | status = nfs_do_filldir(desc, dirent, filldir); |
| 494 | |
| 495 | /* Reset read descriptor so it searches the page cache from |
| 496 | * the start upon the next call to readdir_search_pagecache() */ |
| 497 | desc->page_index = 0; |
| 498 | desc->entry->cookie = desc->entry->prev_cookie = 0; |
| 499 | desc->entry->eof = 0; |
| 500 | out: |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 501 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
| 502 | __FUNCTION__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | return status; |
| 504 | out_release: |
| 505 | dir_page_release(desc); |
| 506 | goto out; |
| 507 | } |
| 508 | |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 509 | /* The file offset position represents the dirent entry number. A |
| 510 | last cookie cache takes care of the common case of reading the |
| 511 | whole directory. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | */ |
| 513 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) |
| 514 | { |
| 515 | struct dentry *dentry = filp->f_dentry; |
| 516 | struct inode *inode = dentry->d_inode; |
| 517 | nfs_readdir_descriptor_t my_desc, |
| 518 | *desc = &my_desc; |
| 519 | struct nfs_entry my_entry; |
| 520 | struct nfs_fh fh; |
| 521 | struct nfs_fattr fattr; |
| 522 | long res; |
| 523 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 524 | dfprintk(VFS, "NFS: readdir(%s/%s) starting at cookie %Lu\n", |
| 525 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 526 | (long long)filp->f_pos); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 527 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
| 528 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 529 | lock_kernel(); |
| 530 | |
| 531 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| 532 | if (res < 0) { |
| 533 | unlock_kernel(); |
| 534 | return res; |
| 535 | } |
| 536 | |
| 537 | /* |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 538 | * filp->f_pos points to the dirent entry number. |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 539 | * *desc->dir_cookie has the cookie for the next entry. We have |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 540 | * to either find the entry with the appropriate number or |
| 541 | * revalidate the cookie. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 542 | */ |
| 543 | memset(desc, 0, sizeof(*desc)); |
| 544 | |
| 545 | desc->file = filp; |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 546 | desc->dir_cookie = &((struct nfs_open_context *)filp->private_data)->dir_cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
| 548 | desc->plus = NFS_USE_READDIRPLUS(inode); |
| 549 | |
| 550 | my_entry.cookie = my_entry.prev_cookie = 0; |
| 551 | my_entry.eof = 0; |
| 552 | my_entry.fh = &fh; |
| 553 | my_entry.fattr = &fattr; |
Trond Myklebust | 0e574af | 2005-10-27 22:12:38 -0400 | [diff] [blame] | 554 | nfs_fattr_init(&fattr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 555 | desc->entry = &my_entry; |
| 556 | |
| 557 | while(!desc->entry->eof) { |
| 558 | res = readdir_search_pagecache(desc); |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 559 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 560 | if (res == -EBADCOOKIE) { |
| 561 | /* This means either end of directory */ |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 562 | if (*desc->dir_cookie && desc->entry->cookie != *desc->dir_cookie) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 563 | /* Or that the server has 'lost' a cookie */ |
| 564 | res = uncached_readdir(desc, dirent, filldir); |
| 565 | if (res >= 0) |
| 566 | continue; |
| 567 | } |
| 568 | res = 0; |
| 569 | break; |
| 570 | } |
| 571 | if (res == -ETOOSMALL && desc->plus) { |
Chuck Lever | 412d582 | 2005-08-18 11:24:11 -0700 | [diff] [blame] | 572 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | nfs_zap_caches(inode); |
| 574 | desc->plus = 0; |
| 575 | desc->entry->eof = 0; |
| 576 | continue; |
| 577 | } |
| 578 | if (res < 0) |
| 579 | break; |
| 580 | |
| 581 | res = nfs_do_filldir(desc, dirent, filldir); |
| 582 | if (res < 0) { |
| 583 | res = 0; |
| 584 | break; |
| 585 | } |
| 586 | } |
| 587 | unlock_kernel(); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 588 | if (res > 0) |
| 589 | res = 0; |
| 590 | dfprintk(VFS, "NFS: readdir(%s/%s) returns %ld\n", |
| 591 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 592 | res); |
| 593 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 594 | } |
| 595 | |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 596 | loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin) |
| 597 | { |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 598 | mutex_lock(&filp->f_dentry->d_inode->i_mutex); |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 599 | switch (origin) { |
| 600 | case 1: |
| 601 | offset += filp->f_pos; |
| 602 | case 0: |
| 603 | if (offset >= 0) |
| 604 | break; |
| 605 | default: |
| 606 | offset = -EINVAL; |
| 607 | goto out; |
| 608 | } |
| 609 | if (offset != filp->f_pos) { |
| 610 | filp->f_pos = offset; |
| 611 | ((struct nfs_open_context *)filp->private_data)->dir_cookie = 0; |
| 612 | } |
| 613 | out: |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 614 | mutex_unlock(&filp->f_dentry->d_inode->i_mutex); |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 615 | return offset; |
| 616 | } |
| 617 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | /* |
| 619 | * All directory operations under NFS are synchronous, so fsync() |
| 620 | * is a dummy operation. |
| 621 | */ |
| 622 | int nfs_fsync_dir(struct file *filp, struct dentry *dentry, int datasync) |
| 623 | { |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 624 | dfprintk(VFS, "NFS: fsync_dir(%s/%s) datasync %d\n", |
| 625 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 626 | datasync); |
| 627 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | return 0; |
| 629 | } |
| 630 | |
| 631 | /* |
| 632 | * A check for whether or not the parent directory has changed. |
| 633 | * In the case it has, we assume that the dentries are untrustworthy |
| 634 | * and may need to be looked up again. |
| 635 | */ |
| 636 | static inline int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
| 637 | { |
| 638 | if (IS_ROOT(dentry)) |
| 639 | return 1; |
Chuck Lever | 5529680 | 2005-08-18 11:24:09 -0700 | [diff] [blame] | 640 | if ((NFS_I(dir)->cache_validity & NFS_INO_INVALID_ATTR) != 0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 641 | || nfs_attribute_timeout(dir)) |
| 642 | return 0; |
| 643 | return nfs_verify_change_attribute(dir, (unsigned long)dentry->d_fsdata); |
| 644 | } |
| 645 | |
| 646 | static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf) |
| 647 | { |
| 648 | dentry->d_fsdata = (void *)verf; |
| 649 | } |
| 650 | |
| 651 | /* |
| 652 | * Whenever an NFS operation succeeds, we know that the dentry |
| 653 | * is valid, so we update the revalidation timestamp. |
| 654 | */ |
| 655 | static inline void nfs_renew_times(struct dentry * dentry) |
| 656 | { |
| 657 | dentry->d_time = jiffies; |
| 658 | } |
| 659 | |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 660 | /* |
| 661 | * Return the intent data that applies to this particular path component |
| 662 | * |
| 663 | * Note that the current set of intents only apply to the very last |
| 664 | * component of the path. |
| 665 | * We check for this using LOOKUP_CONTINUE and LOOKUP_PARENT. |
| 666 | */ |
| 667 | static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, unsigned int mask) |
| 668 | { |
| 669 | if (nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT)) |
| 670 | return 0; |
| 671 | return nd->flags & mask; |
| 672 | } |
| 673 | |
| 674 | /* |
| 675 | * Inode and filehandle revalidation for lookups. |
| 676 | * |
| 677 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, |
| 678 | * or if the intent information indicates that we're about to open this |
| 679 | * particular file and the "nocto" mount flag is not set. |
| 680 | * |
| 681 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 682 | static inline |
| 683 | int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd) |
| 684 | { |
| 685 | struct nfs_server *server = NFS_SERVER(inode); |
| 686 | |
| 687 | if (nd != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 688 | /* VFS wants an on-the-wire revalidation */ |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 689 | if (nd->flags & LOOKUP_REVAL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 690 | goto out_force; |
| 691 | /* This is an open(2) */ |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 692 | if (nfs_lookup_check_intent(nd, LOOKUP_OPEN) != 0 && |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | !(server->flags & NFS_MOUNT_NOCTO)) |
| 694 | goto out_force; |
| 695 | } |
| 696 | return nfs_revalidate_inode(server, inode); |
| 697 | out_force: |
| 698 | return __nfs_revalidate_inode(server, inode); |
| 699 | } |
| 700 | |
| 701 | /* |
| 702 | * We judge how long we want to trust negative |
| 703 | * dentries by looking at the parent inode mtime. |
| 704 | * |
| 705 | * If parent mtime has changed, we revalidate, else we wait for a |
| 706 | * period corresponding to the parent's attribute cache timeout value. |
| 707 | */ |
| 708 | static inline |
| 709 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, |
| 710 | struct nameidata *nd) |
| 711 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 712 | /* Don't revalidate a negative dentry if we're creating a new file */ |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 713 | if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 714 | return 0; |
| 715 | return !nfs_check_verifier(dir, dentry); |
| 716 | } |
| 717 | |
| 718 | /* |
| 719 | * This is called every time the dcache has a lookup hit, |
| 720 | * and we should check whether we can really trust that |
| 721 | * lookup. |
| 722 | * |
| 723 | * NOTE! The hit can be a negative hit too, don't assume |
| 724 | * we have an inode! |
| 725 | * |
| 726 | * If the parent directory is seen to have changed, we throw out the |
| 727 | * cached dentry and do a new lookup. |
| 728 | */ |
| 729 | static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd) |
| 730 | { |
| 731 | struct inode *dir; |
| 732 | struct inode *inode; |
| 733 | struct dentry *parent; |
| 734 | int error; |
| 735 | struct nfs_fh fhandle; |
| 736 | struct nfs_fattr fattr; |
| 737 | unsigned long verifier; |
| 738 | |
| 739 | parent = dget_parent(dentry); |
| 740 | lock_kernel(); |
| 741 | dir = parent->d_inode; |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 742 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | inode = dentry->d_inode; |
| 744 | |
| 745 | if (!inode) { |
| 746 | if (nfs_neg_need_reval(dir, dentry, nd)) |
| 747 | goto out_bad; |
| 748 | goto out_valid; |
| 749 | } |
| 750 | |
| 751 | if (is_bad_inode(inode)) { |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 752 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
| 753 | __FUNCTION__, dentry->d_parent->d_name.name, |
| 754 | dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 755 | goto out_bad; |
| 756 | } |
| 757 | |
| 758 | /* Revalidate parent directory attribute cache */ |
| 759 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) |
| 760 | goto out_zap_parent; |
| 761 | |
| 762 | /* Force a full look up iff the parent directory has changed */ |
| 763 | if (nfs_check_verifier(dir, dentry)) { |
| 764 | if (nfs_lookup_verify_inode(inode, nd)) |
| 765 | goto out_zap_parent; |
| 766 | goto out_valid; |
| 767 | } |
| 768 | |
| 769 | if (NFS_STALE(inode)) |
| 770 | goto out_bad; |
| 771 | |
| 772 | verifier = nfs_save_change_attribute(dir); |
| 773 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr); |
| 774 | if (error) |
| 775 | goto out_bad; |
| 776 | if (nfs_compare_fh(NFS_FH(inode), &fhandle)) |
| 777 | goto out_bad; |
| 778 | if ((error = nfs_refresh_inode(inode, &fattr)) != 0) |
| 779 | goto out_bad; |
| 780 | |
| 781 | nfs_renew_times(dentry); |
| 782 | nfs_set_verifier(dentry, verifier); |
| 783 | out_valid: |
| 784 | unlock_kernel(); |
| 785 | dput(parent); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 786 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
| 787 | __FUNCTION__, dentry->d_parent->d_name.name, |
| 788 | dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 789 | return 1; |
| 790 | out_zap_parent: |
| 791 | nfs_zap_caches(dir); |
| 792 | out_bad: |
| 793 | NFS_CACHEINV(dir); |
| 794 | if (inode && S_ISDIR(inode->i_mode)) { |
| 795 | /* Purge readdir caches. */ |
| 796 | nfs_zap_caches(inode); |
| 797 | /* If we have submounts, don't unhash ! */ |
| 798 | if (have_submounts(dentry)) |
| 799 | goto out_valid; |
| 800 | shrink_dcache_parent(dentry); |
| 801 | } |
| 802 | d_drop(dentry); |
| 803 | unlock_kernel(); |
| 804 | dput(parent); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 805 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
| 806 | __FUNCTION__, dentry->d_parent->d_name.name, |
| 807 | dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 808 | return 0; |
| 809 | } |
| 810 | |
| 811 | /* |
| 812 | * This is called from dput() when d_count is going to 0. |
| 813 | */ |
| 814 | static int nfs_dentry_delete(struct dentry *dentry) |
| 815 | { |
| 816 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", |
| 817 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 818 | dentry->d_flags); |
| 819 | |
| 820 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
| 821 | /* Unhash it, so that ->d_iput() would be called */ |
| 822 | return 1; |
| 823 | } |
| 824 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { |
| 825 | /* Unhash it, so that ancestors of killed async unlink |
| 826 | * files will be cleaned up during umount */ |
| 827 | return 1; |
| 828 | } |
| 829 | return 0; |
| 830 | |
| 831 | } |
| 832 | |
| 833 | /* |
| 834 | * Called when the dentry loses inode. |
| 835 | * We use it to clean up silly-renamed files. |
| 836 | */ |
| 837 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) |
| 838 | { |
Trond Myklebust | cae7a07 | 2005-10-18 14:20:19 -0700 | [diff] [blame] | 839 | nfs_inode_return_delegation(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 840 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
| 841 | lock_kernel(); |
| 842 | inode->i_nlink--; |
| 843 | nfs_complete_unlink(dentry); |
| 844 | unlock_kernel(); |
| 845 | } |
| 846 | /* When creating a negative dentry, we want to renew d_time */ |
| 847 | nfs_renew_times(dentry); |
| 848 | iput(inode); |
| 849 | } |
| 850 | |
| 851 | struct dentry_operations nfs_dentry_operations = { |
| 852 | .d_revalidate = nfs_lookup_revalidate, |
| 853 | .d_delete = nfs_dentry_delete, |
| 854 | .d_iput = nfs_dentry_iput, |
| 855 | }; |
| 856 | |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 857 | /* |
| 858 | * Use intent information to check whether or not we're going to do |
| 859 | * an O_EXCL create using this path component. |
| 860 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 861 | static inline |
| 862 | int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd) |
| 863 | { |
| 864 | if (NFS_PROTO(dir)->version == 2) |
| 865 | return 0; |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 866 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_CREATE) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 867 | return 0; |
| 868 | return (nd->intent.open.flags & O_EXCL) != 0; |
| 869 | } |
| 870 | |
| 871 | static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| 872 | { |
| 873 | struct dentry *res; |
| 874 | struct inode *inode = NULL; |
| 875 | int error; |
| 876 | struct nfs_fh fhandle; |
| 877 | struct nfs_fattr fattr; |
| 878 | |
| 879 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", |
| 880 | dentry->d_parent->d_name.name, dentry->d_name.name); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 881 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | |
| 883 | res = ERR_PTR(-ENAMETOOLONG); |
| 884 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
| 885 | goto out; |
| 886 | |
| 887 | res = ERR_PTR(-ENOMEM); |
| 888 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; |
| 889 | |
| 890 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | |
| 892 | /* If we're doing an exclusive create, optimize away the lookup */ |
| 893 | if (nfs_is_exclusive_create(dir, nd)) |
| 894 | goto no_entry; |
| 895 | |
| 896 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr); |
| 897 | if (error == -ENOENT) |
| 898 | goto no_entry; |
| 899 | if (error < 0) { |
| 900 | res = ERR_PTR(error); |
| 901 | goto out_unlock; |
| 902 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 903 | inode = nfs_fhget(dentry->d_sb, &fhandle, &fattr); |
Trond Myklebust | 03f28e3 | 2006-03-20 13:44:48 -0500 | [diff] [blame] | 904 | res = (struct dentry *)inode; |
| 905 | if (IS_ERR(res)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | goto out_unlock; |
| 907 | no_entry: |
| 908 | res = d_add_unique(dentry, inode); |
| 909 | if (res != NULL) |
| 910 | dentry = res; |
| 911 | nfs_renew_times(dentry); |
| 912 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 913 | out_unlock: |
| 914 | unlock_kernel(); |
| 915 | out: |
| 916 | return res; |
| 917 | } |
| 918 | |
| 919 | #ifdef CONFIG_NFS_V4 |
| 920 | static int nfs_open_revalidate(struct dentry *, struct nameidata *); |
| 921 | |
| 922 | struct dentry_operations nfs4_dentry_operations = { |
| 923 | .d_revalidate = nfs_open_revalidate, |
| 924 | .d_delete = nfs_dentry_delete, |
| 925 | .d_iput = nfs_dentry_iput, |
| 926 | }; |
| 927 | |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 928 | /* |
| 929 | * Use intent information to determine whether we need to substitute |
| 930 | * the NFSv4-style stateful OPEN for the LOOKUP call |
| 931 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | static int is_atomic_open(struct inode *dir, struct nameidata *nd) |
| 933 | { |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 934 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_OPEN) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 935 | return 0; |
| 936 | /* NFS does not (yet) have a stateful open for directories */ |
| 937 | if (nd->flags & LOOKUP_DIRECTORY) |
| 938 | return 0; |
| 939 | /* Are we trying to write to a read only partition? */ |
| 940 | if (IS_RDONLY(dir) && (nd->intent.open.flags & (O_CREAT|O_TRUNC|FMODE_WRITE))) |
| 941 | return 0; |
| 942 | return 1; |
| 943 | } |
| 944 | |
| 945 | static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
| 946 | { |
| 947 | struct dentry *res = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 948 | int error; |
| 949 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 950 | dfprintk(VFS, "NFS: atomic_lookup(%s/%ld), %s\n", |
| 951 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
| 952 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 953 | /* Check that we are indeed trying to open this file */ |
| 954 | if (!is_atomic_open(dir, nd)) |
| 955 | goto no_open; |
| 956 | |
| 957 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) { |
| 958 | res = ERR_PTR(-ENAMETOOLONG); |
| 959 | goto out; |
| 960 | } |
| 961 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; |
| 962 | |
| 963 | /* Let vfs_create() deal with O_EXCL */ |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 964 | if (nd->intent.open.flags & O_EXCL) { |
| 965 | d_add(dentry, NULL); |
| 966 | goto out; |
| 967 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 968 | |
| 969 | /* Open the file on the server */ |
| 970 | lock_kernel(); |
| 971 | /* Revalidate parent directory attribute cache */ |
| 972 | error = nfs_revalidate_inode(NFS_SERVER(dir), dir); |
| 973 | if (error < 0) { |
| 974 | res = ERR_PTR(error); |
Steve Dickson | 01c314a | 2005-08-19 17:57:48 -0700 | [diff] [blame] | 975 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | goto out; |
| 977 | } |
| 978 | |
| 979 | if (nd->intent.open.flags & O_CREAT) { |
| 980 | nfs_begin_data_update(dir); |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 981 | res = nfs4_atomic_open(dir, dentry, nd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 982 | nfs_end_data_update(dir); |
| 983 | } else |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 984 | res = nfs4_atomic_open(dir, dentry, nd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 985 | unlock_kernel(); |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 986 | if (IS_ERR(res)) { |
| 987 | error = PTR_ERR(res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 988 | switch (error) { |
| 989 | /* Make a negative dentry */ |
| 990 | case -ENOENT: |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 991 | res = NULL; |
| 992 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 993 | /* This turned out not to be a regular file */ |
Trond Myklebust | 6f926b5 | 2005-10-18 14:20:18 -0700 | [diff] [blame] | 994 | case -EISDIR: |
| 995 | case -ENOTDIR: |
| 996 | goto no_open; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 997 | case -ELOOP: |
| 998 | if (!(nd->intent.open.flags & O_NOFOLLOW)) |
| 999 | goto no_open; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | /* case -EINVAL: */ |
| 1001 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1002 | goto out; |
| 1003 | } |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 1004 | } else if (res != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1005 | dentry = res; |
| 1006 | nfs_renew_times(dentry); |
| 1007 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 1008 | out: |
| 1009 | return res; |
| 1010 | no_open: |
| 1011 | return nfs_lookup(dir, dentry, nd); |
| 1012 | } |
| 1013 | |
| 1014 | static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 1015 | { |
| 1016 | struct dentry *parent = NULL; |
| 1017 | struct inode *inode = dentry->d_inode; |
| 1018 | struct inode *dir; |
| 1019 | unsigned long verifier; |
| 1020 | int openflags, ret = 0; |
| 1021 | |
| 1022 | parent = dget_parent(dentry); |
| 1023 | dir = parent->d_inode; |
| 1024 | if (!is_atomic_open(dir, nd)) |
| 1025 | goto no_open; |
| 1026 | /* We can't create new files in nfs_open_revalidate(), so we |
| 1027 | * optimize away revalidation of negative dentries. |
| 1028 | */ |
| 1029 | if (inode == NULL) |
| 1030 | goto out; |
| 1031 | /* NFS only supports OPEN on regular files */ |
| 1032 | if (!S_ISREG(inode->i_mode)) |
| 1033 | goto no_open; |
| 1034 | openflags = nd->intent.open.flags; |
| 1035 | /* We cannot do exclusive creation on a positive dentry */ |
| 1036 | if ((openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) |
| 1037 | goto no_open; |
| 1038 | /* We can't create new files, or truncate existing ones here */ |
| 1039 | openflags &= ~(O_CREAT|O_TRUNC); |
| 1040 | |
| 1041 | /* |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 1042 | * Note: we're not holding inode->i_mutex and so may be racing with |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1043 | * operations that change the directory. We therefore save the |
| 1044 | * change attribute *before* we do the RPC call. |
| 1045 | */ |
| 1046 | lock_kernel(); |
| 1047 | verifier = nfs_save_change_attribute(dir); |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 1048 | ret = nfs4_open_revalidate(dir, dentry, openflags, nd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1049 | if (!ret) |
| 1050 | nfs_set_verifier(dentry, verifier); |
| 1051 | unlock_kernel(); |
| 1052 | out: |
| 1053 | dput(parent); |
| 1054 | if (!ret) |
| 1055 | d_drop(dentry); |
| 1056 | return ret; |
| 1057 | no_open: |
| 1058 | dput(parent); |
| 1059 | if (inode != NULL && nfs_have_delegation(inode, FMODE_READ)) |
| 1060 | return 1; |
| 1061 | return nfs_lookup_revalidate(dentry, nd); |
| 1062 | } |
| 1063 | #endif /* CONFIG_NFSV4 */ |
| 1064 | |
| 1065 | static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc) |
| 1066 | { |
| 1067 | struct dentry *parent = desc->file->f_dentry; |
| 1068 | struct inode *dir = parent->d_inode; |
| 1069 | struct nfs_entry *entry = desc->entry; |
| 1070 | struct dentry *dentry, *alias; |
| 1071 | struct qstr name = { |
| 1072 | .name = entry->name, |
| 1073 | .len = entry->len, |
| 1074 | }; |
| 1075 | struct inode *inode; |
| 1076 | |
| 1077 | switch (name.len) { |
| 1078 | case 2: |
| 1079 | if (name.name[0] == '.' && name.name[1] == '.') |
| 1080 | return dget_parent(parent); |
| 1081 | break; |
| 1082 | case 1: |
| 1083 | if (name.name[0] == '.') |
| 1084 | return dget(parent); |
| 1085 | } |
| 1086 | name.hash = full_name_hash(name.name, name.len); |
| 1087 | dentry = d_lookup(parent, &name); |
| 1088 | if (dentry != NULL) |
| 1089 | return dentry; |
| 1090 | if (!desc->plus || !(entry->fattr->valid & NFS_ATTR_FATTR)) |
| 1091 | return NULL; |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 1092 | /* Note: caller is already holding the dir->i_mutex! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1093 | dentry = d_alloc(parent, &name); |
| 1094 | if (dentry == NULL) |
| 1095 | return NULL; |
| 1096 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; |
| 1097 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); |
Trond Myklebust | 03f28e3 | 2006-03-20 13:44:48 -0500 | [diff] [blame] | 1098 | if (IS_ERR(inode)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1099 | dput(dentry); |
| 1100 | return NULL; |
| 1101 | } |
| 1102 | alias = d_add_unique(dentry, inode); |
| 1103 | if (alias != NULL) { |
| 1104 | dput(dentry); |
| 1105 | dentry = alias; |
| 1106 | } |
| 1107 | nfs_renew_times(dentry); |
| 1108 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 1109 | return dentry; |
| 1110 | } |
| 1111 | |
| 1112 | /* |
| 1113 | * Code common to create, mkdir, and mknod. |
| 1114 | */ |
| 1115 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, |
| 1116 | struct nfs_fattr *fattr) |
| 1117 | { |
| 1118 | struct inode *inode; |
| 1119 | int error = -EACCES; |
| 1120 | |
| 1121 | /* We may have been initialized further down */ |
| 1122 | if (dentry->d_inode) |
| 1123 | return 0; |
| 1124 | if (fhandle->size == 0) { |
| 1125 | struct inode *dir = dentry->d_parent->d_inode; |
| 1126 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
| 1127 | if (error) |
| 1128 | goto out_err; |
| 1129 | } |
| 1130 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
| 1131 | struct nfs_server *server = NFS_SB(dentry->d_sb); |
| 1132 | error = server->rpc_ops->getattr(server, fhandle, fattr); |
| 1133 | if (error < 0) |
| 1134 | goto out_err; |
| 1135 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1136 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
Trond Myklebust | 03f28e3 | 2006-03-20 13:44:48 -0500 | [diff] [blame] | 1137 | error = PTR_ERR(inode); |
| 1138 | if (IS_ERR(inode)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | goto out_err; |
| 1140 | d_instantiate(dentry, inode); |
| 1141 | return 0; |
| 1142 | out_err: |
| 1143 | d_drop(dentry); |
| 1144 | return error; |
| 1145 | } |
| 1146 | |
| 1147 | /* |
| 1148 | * Following a failed create operation, we drop the dentry rather |
| 1149 | * than retain a negative dentry. This avoids a problem in the event |
| 1150 | * that the operation succeeded on the server, but an error in the |
| 1151 | * reply path made it appear to have failed. |
| 1152 | */ |
| 1153 | static int nfs_create(struct inode *dir, struct dentry *dentry, int mode, |
| 1154 | struct nameidata *nd) |
| 1155 | { |
| 1156 | struct iattr attr; |
| 1157 | int error; |
| 1158 | int open_flags = 0; |
| 1159 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1160 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
| 1161 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1162 | |
| 1163 | attr.ia_mode = mode; |
| 1164 | attr.ia_valid = ATTR_MODE; |
| 1165 | |
| 1166 | if (nd && (nd->flags & LOOKUP_CREATE)) |
| 1167 | open_flags = nd->intent.open.flags; |
| 1168 | |
| 1169 | lock_kernel(); |
| 1170 | nfs_begin_data_update(dir); |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 1171 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, nd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | nfs_end_data_update(dir); |
| 1173 | if (error != 0) |
| 1174 | goto out_err; |
| 1175 | nfs_renew_times(dentry); |
| 1176 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 1177 | unlock_kernel(); |
| 1178 | return 0; |
| 1179 | out_err: |
| 1180 | unlock_kernel(); |
| 1181 | d_drop(dentry); |
| 1182 | return error; |
| 1183 | } |
| 1184 | |
| 1185 | /* |
| 1186 | * See comments for nfs_proc_create regarding failed operations. |
| 1187 | */ |
| 1188 | static int |
| 1189 | nfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) |
| 1190 | { |
| 1191 | struct iattr attr; |
| 1192 | int status; |
| 1193 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1194 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
| 1195 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | |
| 1197 | if (!new_valid_dev(rdev)) |
| 1198 | return -EINVAL; |
| 1199 | |
| 1200 | attr.ia_mode = mode; |
| 1201 | attr.ia_valid = ATTR_MODE; |
| 1202 | |
| 1203 | lock_kernel(); |
| 1204 | nfs_begin_data_update(dir); |
| 1205 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
| 1206 | nfs_end_data_update(dir); |
| 1207 | if (status != 0) |
| 1208 | goto out_err; |
| 1209 | nfs_renew_times(dentry); |
| 1210 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 1211 | unlock_kernel(); |
| 1212 | return 0; |
| 1213 | out_err: |
| 1214 | unlock_kernel(); |
| 1215 | d_drop(dentry); |
| 1216 | return status; |
| 1217 | } |
| 1218 | |
| 1219 | /* |
| 1220 | * See comments for nfs_proc_create regarding failed operations. |
| 1221 | */ |
| 1222 | static int nfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 1223 | { |
| 1224 | struct iattr attr; |
| 1225 | int error; |
| 1226 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1227 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
| 1228 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1229 | |
| 1230 | attr.ia_valid = ATTR_MODE; |
| 1231 | attr.ia_mode = mode | S_IFDIR; |
| 1232 | |
| 1233 | lock_kernel(); |
| 1234 | nfs_begin_data_update(dir); |
| 1235 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
| 1236 | nfs_end_data_update(dir); |
| 1237 | if (error != 0) |
| 1238 | goto out_err; |
| 1239 | nfs_renew_times(dentry); |
| 1240 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 1241 | unlock_kernel(); |
| 1242 | return 0; |
| 1243 | out_err: |
| 1244 | d_drop(dentry); |
| 1245 | unlock_kernel(); |
| 1246 | return error; |
| 1247 | } |
| 1248 | |
| 1249 | static int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
| 1250 | { |
| 1251 | int error; |
| 1252 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1253 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
| 1254 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | |
| 1256 | lock_kernel(); |
| 1257 | nfs_begin_data_update(dir); |
| 1258 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
| 1259 | /* Ensure the VFS deletes this inode */ |
| 1260 | if (error == 0 && dentry->d_inode != NULL) |
| 1261 | dentry->d_inode->i_nlink = 0; |
| 1262 | nfs_end_data_update(dir); |
| 1263 | unlock_kernel(); |
| 1264 | |
| 1265 | return error; |
| 1266 | } |
| 1267 | |
| 1268 | static int nfs_sillyrename(struct inode *dir, struct dentry *dentry) |
| 1269 | { |
| 1270 | static unsigned int sillycounter; |
| 1271 | const int i_inosize = sizeof(dir->i_ino)*2; |
| 1272 | const int countersize = sizeof(sillycounter)*2; |
| 1273 | const int slen = sizeof(".nfs") + i_inosize + countersize - 1; |
| 1274 | char silly[slen+1]; |
| 1275 | struct qstr qsilly; |
| 1276 | struct dentry *sdentry; |
| 1277 | int error = -EIO; |
| 1278 | |
| 1279 | dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n", |
| 1280 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 1281 | atomic_read(&dentry->d_count)); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1282 | nfs_inc_stats(dir, NFSIOS_SILLYRENAME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | |
| 1284 | #ifdef NFS_PARANOIA |
| 1285 | if (!dentry->d_inode) |
| 1286 | printk("NFS: silly-renaming %s/%s, negative dentry??\n", |
| 1287 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 1288 | #endif |
| 1289 | /* |
| 1290 | * We don't allow a dentry to be silly-renamed twice. |
| 1291 | */ |
| 1292 | error = -EBUSY; |
| 1293 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) |
| 1294 | goto out; |
| 1295 | |
| 1296 | sprintf(silly, ".nfs%*.*lx", |
| 1297 | i_inosize, i_inosize, dentry->d_inode->i_ino); |
| 1298 | |
Trond Myklebust | 34ea818 | 2005-11-04 15:35:02 -0500 | [diff] [blame] | 1299 | /* Return delegation in anticipation of the rename */ |
| 1300 | nfs_inode_return_delegation(dentry->d_inode); |
| 1301 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1302 | sdentry = NULL; |
| 1303 | do { |
| 1304 | char *suffix = silly + slen - countersize; |
| 1305 | |
| 1306 | dput(sdentry); |
| 1307 | sillycounter++; |
| 1308 | sprintf(suffix, "%*.*x", countersize, countersize, sillycounter); |
| 1309 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1310 | dfprintk(VFS, "NFS: trying to rename %s to %s\n", |
| 1311 | dentry->d_name.name, silly); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | |
| 1313 | sdentry = lookup_one_len(silly, dentry->d_parent, slen); |
| 1314 | /* |
| 1315 | * N.B. Better to return EBUSY here ... it could be |
| 1316 | * dangerous to delete the file while it's in use. |
| 1317 | */ |
| 1318 | if (IS_ERR(sdentry)) |
| 1319 | goto out; |
| 1320 | } while(sdentry->d_inode != NULL); /* need negative lookup */ |
| 1321 | |
| 1322 | qsilly.name = silly; |
| 1323 | qsilly.len = strlen(silly); |
| 1324 | nfs_begin_data_update(dir); |
| 1325 | if (dentry->d_inode) { |
| 1326 | nfs_begin_data_update(dentry->d_inode); |
| 1327 | error = NFS_PROTO(dir)->rename(dir, &dentry->d_name, |
| 1328 | dir, &qsilly); |
Trond Myklebust | 5ba7cc4 | 2005-12-03 15:20:17 -0500 | [diff] [blame] | 1329 | nfs_mark_for_revalidate(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | nfs_end_data_update(dentry->d_inode); |
| 1331 | } else |
| 1332 | error = NFS_PROTO(dir)->rename(dir, &dentry->d_name, |
| 1333 | dir, &qsilly); |
| 1334 | nfs_end_data_update(dir); |
| 1335 | if (!error) { |
| 1336 | nfs_renew_times(dentry); |
| 1337 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 1338 | d_move(dentry, sdentry); |
| 1339 | error = nfs_async_unlink(dentry); |
| 1340 | /* If we return 0 we don't unlink */ |
| 1341 | } |
| 1342 | dput(sdentry); |
| 1343 | out: |
| 1344 | return error; |
| 1345 | } |
| 1346 | |
| 1347 | /* |
| 1348 | * Remove a file after making sure there are no pending writes, |
| 1349 | * and after checking that the file has only one user. |
| 1350 | * |
| 1351 | * We invalidate the attribute cache and free the inode prior to the operation |
| 1352 | * to avoid possible races if the server reuses the inode. |
| 1353 | */ |
| 1354 | static int nfs_safe_remove(struct dentry *dentry) |
| 1355 | { |
| 1356 | struct inode *dir = dentry->d_parent->d_inode; |
| 1357 | struct inode *inode = dentry->d_inode; |
| 1358 | int error = -EBUSY; |
| 1359 | |
| 1360 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", |
| 1361 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 1362 | |
| 1363 | /* If the dentry was sillyrenamed, we simply call d_delete() */ |
| 1364 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
| 1365 | error = 0; |
| 1366 | goto out; |
| 1367 | } |
| 1368 | |
| 1369 | nfs_begin_data_update(dir); |
| 1370 | if (inode != NULL) { |
Trond Myklebust | cae7a07 | 2005-10-18 14:20:19 -0700 | [diff] [blame] | 1371 | nfs_inode_return_delegation(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1372 | nfs_begin_data_update(inode); |
| 1373 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
| 1374 | /* The VFS may want to delete this inode */ |
| 1375 | if (error == 0) |
| 1376 | inode->i_nlink--; |
Trond Myklebust | 5ba7cc4 | 2005-12-03 15:20:17 -0500 | [diff] [blame] | 1377 | nfs_mark_for_revalidate(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1378 | nfs_end_data_update(inode); |
| 1379 | } else |
| 1380 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
| 1381 | nfs_end_data_update(dir); |
| 1382 | out: |
| 1383 | return error; |
| 1384 | } |
| 1385 | |
| 1386 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode |
| 1387 | * belongs to an active ".nfs..." file and we return -EBUSY. |
| 1388 | * |
| 1389 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. |
| 1390 | */ |
| 1391 | static int nfs_unlink(struct inode *dir, struct dentry *dentry) |
| 1392 | { |
| 1393 | int error; |
| 1394 | int need_rehash = 0; |
| 1395 | |
| 1396 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, |
| 1397 | dir->i_ino, dentry->d_name.name); |
| 1398 | |
| 1399 | lock_kernel(); |
| 1400 | spin_lock(&dcache_lock); |
| 1401 | spin_lock(&dentry->d_lock); |
| 1402 | if (atomic_read(&dentry->d_count) > 1) { |
| 1403 | spin_unlock(&dentry->d_lock); |
| 1404 | spin_unlock(&dcache_lock); |
| 1405 | error = nfs_sillyrename(dir, dentry); |
| 1406 | unlock_kernel(); |
| 1407 | return error; |
| 1408 | } |
| 1409 | if (!d_unhashed(dentry)) { |
| 1410 | __d_drop(dentry); |
| 1411 | need_rehash = 1; |
| 1412 | } |
| 1413 | spin_unlock(&dentry->d_lock); |
| 1414 | spin_unlock(&dcache_lock); |
| 1415 | error = nfs_safe_remove(dentry); |
| 1416 | if (!error) { |
| 1417 | nfs_renew_times(dentry); |
| 1418 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 1419 | } else if (need_rehash) |
| 1420 | d_rehash(dentry); |
| 1421 | unlock_kernel(); |
| 1422 | return error; |
| 1423 | } |
| 1424 | |
| 1425 | static int |
| 1426 | nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
| 1427 | { |
| 1428 | struct iattr attr; |
| 1429 | struct nfs_fattr sym_attr; |
| 1430 | struct nfs_fh sym_fh; |
| 1431 | struct qstr qsymname; |
| 1432 | int error; |
| 1433 | |
| 1434 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, |
| 1435 | dir->i_ino, dentry->d_name.name, symname); |
| 1436 | |
| 1437 | #ifdef NFS_PARANOIA |
| 1438 | if (dentry->d_inode) |
| 1439 | printk("nfs_proc_symlink: %s/%s not negative!\n", |
| 1440 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 1441 | #endif |
| 1442 | /* |
| 1443 | * Fill in the sattr for the call. |
| 1444 | * Note: SunOS 4.1.2 crashes if the mode isn't initialized! |
| 1445 | */ |
| 1446 | attr.ia_valid = ATTR_MODE; |
| 1447 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
| 1448 | |
| 1449 | qsymname.name = symname; |
| 1450 | qsymname.len = strlen(symname); |
| 1451 | |
| 1452 | lock_kernel(); |
| 1453 | nfs_begin_data_update(dir); |
| 1454 | error = NFS_PROTO(dir)->symlink(dir, &dentry->d_name, &qsymname, |
| 1455 | &attr, &sym_fh, &sym_attr); |
| 1456 | nfs_end_data_update(dir); |
| 1457 | if (!error) { |
| 1458 | error = nfs_instantiate(dentry, &sym_fh, &sym_attr); |
| 1459 | } else { |
| 1460 | if (error == -EEXIST) |
| 1461 | printk("nfs_proc_symlink: %s/%s already exists??\n", |
| 1462 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 1463 | d_drop(dentry); |
| 1464 | } |
| 1465 | unlock_kernel(); |
| 1466 | return error; |
| 1467 | } |
| 1468 | |
| 1469 | static int |
| 1470 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
| 1471 | { |
| 1472 | struct inode *inode = old_dentry->d_inode; |
| 1473 | int error; |
| 1474 | |
| 1475 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", |
| 1476 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, |
| 1477 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 1478 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1479 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1480 | nfs_begin_data_update(dir); |
| 1481 | nfs_begin_data_update(inode); |
| 1482 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
Trond Myklebust | cf80955 | 2005-10-27 22:12:42 -0400 | [diff] [blame] | 1483 | if (error == 0) { |
| 1484 | atomic_inc(&inode->i_count); |
| 1485 | d_instantiate(dentry, inode); |
| 1486 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1487 | nfs_end_data_update(inode); |
| 1488 | nfs_end_data_update(dir); |
| 1489 | unlock_kernel(); |
| 1490 | return error; |
| 1491 | } |
| 1492 | |
| 1493 | /* |
| 1494 | * RENAME |
| 1495 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a |
| 1496 | * different file handle for the same inode after a rename (e.g. when |
| 1497 | * moving to a different directory). A fail-safe method to do so would |
| 1498 | * be to look up old_dir/old_name, create a link to new_dir/new_name and |
| 1499 | * rename the old file using the sillyrename stuff. This way, the original |
| 1500 | * file in old_dir will go away when the last process iput()s the inode. |
| 1501 | * |
| 1502 | * FIXED. |
| 1503 | * |
| 1504 | * It actually works quite well. One needs to have the possibility for |
| 1505 | * at least one ".nfs..." file in each directory the file ever gets |
| 1506 | * moved or linked to which happens automagically with the new |
| 1507 | * implementation that only depends on the dcache stuff instead of |
| 1508 | * using the inode layer |
| 1509 | * |
| 1510 | * Unfortunately, things are a little more complicated than indicated |
| 1511 | * above. For a cross-directory move, we want to make sure we can get |
| 1512 | * rid of the old inode after the operation. This means there must be |
| 1513 | * no pending writes (if it's a file), and the use count must be 1. |
| 1514 | * If these conditions are met, we can drop the dentries before doing |
| 1515 | * the rename. |
| 1516 | */ |
| 1517 | static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 1518 | struct inode *new_dir, struct dentry *new_dentry) |
| 1519 | { |
| 1520 | struct inode *old_inode = old_dentry->d_inode; |
| 1521 | struct inode *new_inode = new_dentry->d_inode; |
| 1522 | struct dentry *dentry = NULL, *rehash = NULL; |
| 1523 | int error = -EBUSY; |
| 1524 | |
| 1525 | /* |
| 1526 | * To prevent any new references to the target during the rename, |
| 1527 | * we unhash the dentry and free the inode in advance. |
| 1528 | */ |
| 1529 | lock_kernel(); |
| 1530 | if (!d_unhashed(new_dentry)) { |
| 1531 | d_drop(new_dentry); |
| 1532 | rehash = new_dentry; |
| 1533 | } |
| 1534 | |
| 1535 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
| 1536 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, |
| 1537 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, |
| 1538 | atomic_read(&new_dentry->d_count)); |
| 1539 | |
| 1540 | /* |
| 1541 | * First check whether the target is busy ... we can't |
| 1542 | * safely do _any_ rename if the target is in use. |
| 1543 | * |
| 1544 | * For files, make a copy of the dentry and then do a |
| 1545 | * silly-rename. If the silly-rename succeeds, the |
| 1546 | * copied dentry is hashed and becomes the new target. |
| 1547 | */ |
| 1548 | if (!new_inode) |
| 1549 | goto go_ahead; |
Trond Myklebust | 6fe43f9 | 2005-10-18 14:20:22 -0700 | [diff] [blame] | 1550 | if (S_ISDIR(new_inode->i_mode)) { |
| 1551 | error = -EISDIR; |
| 1552 | if (!S_ISDIR(old_inode->i_mode)) |
| 1553 | goto out; |
| 1554 | } else if (atomic_read(&new_dentry->d_count) > 2) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1555 | int err; |
| 1556 | /* copy the target dentry's name */ |
| 1557 | dentry = d_alloc(new_dentry->d_parent, |
| 1558 | &new_dentry->d_name); |
| 1559 | if (!dentry) |
| 1560 | goto out; |
| 1561 | |
| 1562 | /* silly-rename the existing target ... */ |
| 1563 | err = nfs_sillyrename(new_dir, new_dentry); |
| 1564 | if (!err) { |
| 1565 | new_dentry = rehash = dentry; |
| 1566 | new_inode = NULL; |
| 1567 | /* instantiate the replacement target */ |
| 1568 | d_instantiate(new_dentry, NULL); |
| 1569 | } else if (atomic_read(&new_dentry->d_count) > 1) { |
| 1570 | /* dentry still busy? */ |
| 1571 | #ifdef NFS_PARANOIA |
| 1572 | printk("nfs_rename: target %s/%s busy, d_count=%d\n", |
| 1573 | new_dentry->d_parent->d_name.name, |
| 1574 | new_dentry->d_name.name, |
| 1575 | atomic_read(&new_dentry->d_count)); |
| 1576 | #endif |
| 1577 | goto out; |
| 1578 | } |
Trond Myklebust | 20509f1 | 2005-08-25 16:25:34 -0700 | [diff] [blame] | 1579 | } else |
| 1580 | new_inode->i_nlink--; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1581 | |
| 1582 | go_ahead: |
| 1583 | /* |
| 1584 | * ... prune child dentries and writebacks if needed. |
| 1585 | */ |
| 1586 | if (atomic_read(&old_dentry->d_count) > 1) { |
| 1587 | nfs_wb_all(old_inode); |
| 1588 | shrink_dcache_parent(old_dentry); |
| 1589 | } |
Trond Myklebust | cae7a07 | 2005-10-18 14:20:19 -0700 | [diff] [blame] | 1590 | nfs_inode_return_delegation(old_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1591 | |
Trond Myklebust | 2417411 | 2006-01-03 09:55:33 +0100 | [diff] [blame] | 1592 | if (new_inode != NULL) { |
| 1593 | nfs_inode_return_delegation(new_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1594 | d_delete(new_dentry); |
Trond Myklebust | 2417411 | 2006-01-03 09:55:33 +0100 | [diff] [blame] | 1595 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1596 | |
| 1597 | nfs_begin_data_update(old_dir); |
| 1598 | nfs_begin_data_update(new_dir); |
| 1599 | nfs_begin_data_update(old_inode); |
| 1600 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
| 1601 | new_dir, &new_dentry->d_name); |
Trond Myklebust | 5ba7cc4 | 2005-12-03 15:20:17 -0500 | [diff] [blame] | 1602 | nfs_mark_for_revalidate(old_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1603 | nfs_end_data_update(old_inode); |
| 1604 | nfs_end_data_update(new_dir); |
| 1605 | nfs_end_data_update(old_dir); |
| 1606 | out: |
| 1607 | if (rehash) |
| 1608 | d_rehash(rehash); |
| 1609 | if (!error) { |
| 1610 | if (!S_ISDIR(old_inode->i_mode)) |
| 1611 | d_move(old_dentry, new_dentry); |
| 1612 | nfs_renew_times(new_dentry); |
| 1613 | nfs_set_verifier(new_dentry, nfs_save_change_attribute(new_dir)); |
| 1614 | } |
| 1615 | |
| 1616 | /* new dentry created? */ |
| 1617 | if (dentry) |
| 1618 | dput(dentry); |
| 1619 | unlock_kernel(); |
| 1620 | return error; |
| 1621 | } |
| 1622 | |
| 1623 | int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
| 1624 | { |
Chuck Lever | 5529680 | 2005-08-18 11:24:09 -0700 | [diff] [blame] | 1625 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1626 | struct nfs_access_entry *cache = &nfsi->cache_access; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1627 | |
| 1628 | if (cache->cred != cred |
| 1629 | || time_after(jiffies, cache->jiffies + NFS_ATTRTIMEO(inode)) |
Chuck Lever | 5529680 | 2005-08-18 11:24:09 -0700 | [diff] [blame] | 1630 | || (nfsi->cache_validity & NFS_INO_INVALID_ACCESS)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1631 | return -ENOENT; |
| 1632 | memcpy(res, cache, sizeof(*res)); |
| 1633 | return 0; |
| 1634 | } |
| 1635 | |
| 1636 | void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
| 1637 | { |
Chuck Lever | 5529680 | 2005-08-18 11:24:09 -0700 | [diff] [blame] | 1638 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1639 | struct nfs_access_entry *cache = &nfsi->cache_access; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1640 | |
| 1641 | if (cache->cred != set->cred) { |
| 1642 | if (cache->cred) |
| 1643 | put_rpccred(cache->cred); |
| 1644 | cache->cred = get_rpccred(set->cred); |
| 1645 | } |
Chuck Lever | dc59250 | 2005-08-18 11:24:12 -0700 | [diff] [blame] | 1646 | /* FIXME: replace current access_cache BKL reliance with inode->i_lock */ |
| 1647 | spin_lock(&inode->i_lock); |
Chuck Lever | 5529680 | 2005-08-18 11:24:09 -0700 | [diff] [blame] | 1648 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; |
Chuck Lever | dc59250 | 2005-08-18 11:24:12 -0700 | [diff] [blame] | 1649 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | cache->jiffies = set->jiffies; |
| 1651 | cache->mask = set->mask; |
| 1652 | } |
| 1653 | |
| 1654 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) |
| 1655 | { |
| 1656 | struct nfs_access_entry cache; |
| 1657 | int status; |
| 1658 | |
| 1659 | status = nfs_access_get_cached(inode, cred, &cache); |
| 1660 | if (status == 0) |
| 1661 | goto out; |
| 1662 | |
| 1663 | /* Be clever: ask server to check for all possible rights */ |
| 1664 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; |
| 1665 | cache.cred = cred; |
| 1666 | cache.jiffies = jiffies; |
| 1667 | status = NFS_PROTO(inode)->access(inode, &cache); |
| 1668 | if (status != 0) |
| 1669 | return status; |
| 1670 | nfs_access_add_cache(inode, &cache); |
| 1671 | out: |
| 1672 | if ((cache.mask & mask) == mask) |
| 1673 | return 0; |
| 1674 | return -EACCES; |
| 1675 | } |
| 1676 | |
| 1677 | int nfs_permission(struct inode *inode, int mask, struct nameidata *nd) |
| 1678 | { |
| 1679 | struct rpc_cred *cred; |
| 1680 | int res = 0; |
| 1681 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1682 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
| 1683 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1684 | if (mask == 0) |
| 1685 | goto out; |
| 1686 | /* Is this sys_access() ? */ |
| 1687 | if (nd != NULL && (nd->flags & LOOKUP_ACCESS)) |
| 1688 | goto force_lookup; |
| 1689 | |
| 1690 | switch (inode->i_mode & S_IFMT) { |
| 1691 | case S_IFLNK: |
| 1692 | goto out; |
| 1693 | case S_IFREG: |
| 1694 | /* NFSv4 has atomic_open... */ |
| 1695 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) |
| 1696 | && nd != NULL |
| 1697 | && (nd->flags & LOOKUP_OPEN)) |
| 1698 | goto out; |
| 1699 | break; |
| 1700 | case S_IFDIR: |
| 1701 | /* |
| 1702 | * Optimize away all write operations, since the server |
| 1703 | * will check permissions when we perform the op. |
| 1704 | */ |
| 1705 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) |
| 1706 | goto out; |
| 1707 | } |
| 1708 | |
| 1709 | force_lookup: |
| 1710 | lock_kernel(); |
| 1711 | |
| 1712 | if (!NFS_PROTO(inode)->access) |
| 1713 | goto out_notsup; |
| 1714 | |
| 1715 | cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0); |
| 1716 | if (!IS_ERR(cred)) { |
| 1717 | res = nfs_do_access(inode, cred, mask); |
| 1718 | put_rpccred(cred); |
| 1719 | } else |
| 1720 | res = PTR_ERR(cred); |
| 1721 | unlock_kernel(); |
| 1722 | out: |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1723 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
| 1724 | inode->i_sb->s_id, inode->i_ino, mask, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1725 | return res; |
| 1726 | out_notsup: |
| 1727 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| 1728 | if (res == 0) |
| 1729 | res = generic_permission(inode, mask, NULL); |
| 1730 | unlock_kernel(); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1731 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1732 | } |
| 1733 | |
| 1734 | /* |
| 1735 | * Local variables: |
| 1736 | * version-control: t |
| 1737 | * kept-new-versions: 5 |
| 1738 | * End: |
| 1739 | */ |