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> |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 33 | #include <linux/pagevec.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 34 | #include <linux/namei.h> |
David Howells | 54ceac4 | 2006-08-22 20:06:13 -0400 | [diff] [blame] | 35 | #include <linux/mount.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 36 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | |
Trond Myklebust | 4ce7971 | 2005-06-22 17:16:21 +0000 | [diff] [blame] | 38 | #include "nfs4_fs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 39 | #include "delegation.h" |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 40 | #include "iostat.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 41 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | /* #define NFS_DEBUG_VERBOSE 1 */ |
| 43 | |
| 44 | static int nfs_opendir(struct inode *, struct file *); |
| 45 | static int nfs_readdir(struct file *, void *, filldir_t); |
| 46 | static struct dentry *nfs_lookup(struct inode *, struct dentry *, struct nameidata *); |
| 47 | static int nfs_create(struct inode *, struct dentry *, int, struct nameidata *); |
| 48 | static int nfs_mkdir(struct inode *, struct dentry *, int); |
| 49 | static int nfs_rmdir(struct inode *, struct dentry *); |
| 50 | static int nfs_unlink(struct inode *, struct dentry *); |
| 51 | static int nfs_symlink(struct inode *, struct dentry *, const char *); |
| 52 | static int nfs_link(struct dentry *, struct inode *, struct dentry *); |
| 53 | static int nfs_mknod(struct inode *, struct dentry *, int, dev_t); |
| 54 | static int nfs_rename(struct inode *, struct dentry *, |
| 55 | struct inode *, struct dentry *); |
| 56 | static int nfs_fsync_dir(struct file *, struct dentry *, int); |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 57 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 58 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 59 | const struct file_operations nfs_dir_operations = { |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 60 | .llseek = nfs_llseek_dir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 61 | .read = generic_read_dir, |
| 62 | .readdir = nfs_readdir, |
| 63 | .open = nfs_opendir, |
| 64 | .release = nfs_release, |
| 65 | .fsync = nfs_fsync_dir, |
| 66 | }; |
| 67 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 68 | const struct inode_operations nfs_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | .create = nfs_create, |
| 70 | .lookup = nfs_lookup, |
| 71 | .link = nfs_link, |
| 72 | .unlink = nfs_unlink, |
| 73 | .symlink = nfs_symlink, |
| 74 | .mkdir = nfs_mkdir, |
| 75 | .rmdir = nfs_rmdir, |
| 76 | .mknod = nfs_mknod, |
| 77 | .rename = nfs_rename, |
| 78 | .permission = nfs_permission, |
| 79 | .getattr = nfs_getattr, |
| 80 | .setattr = nfs_setattr, |
| 81 | }; |
| 82 | |
Andreas Gruenbacher | b7fa055 | 2005-06-22 17:16:27 +0000 | [diff] [blame] | 83 | #ifdef CONFIG_NFS_V3 |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 84 | const struct inode_operations nfs3_dir_inode_operations = { |
Andreas Gruenbacher | b7fa055 | 2005-06-22 17:16:27 +0000 | [diff] [blame] | 85 | .create = nfs_create, |
| 86 | .lookup = nfs_lookup, |
| 87 | .link = nfs_link, |
| 88 | .unlink = nfs_unlink, |
| 89 | .symlink = nfs_symlink, |
| 90 | .mkdir = nfs_mkdir, |
| 91 | .rmdir = nfs_rmdir, |
| 92 | .mknod = nfs_mknod, |
| 93 | .rename = nfs_rename, |
| 94 | .permission = nfs_permission, |
| 95 | .getattr = nfs_getattr, |
| 96 | .setattr = nfs_setattr, |
| 97 | .listxattr = nfs3_listxattr, |
| 98 | .getxattr = nfs3_getxattr, |
| 99 | .setxattr = nfs3_setxattr, |
| 100 | .removexattr = nfs3_removexattr, |
| 101 | }; |
| 102 | #endif /* CONFIG_NFS_V3 */ |
| 103 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 104 | #ifdef CONFIG_NFS_V4 |
| 105 | |
| 106 | static struct dentry *nfs_atomic_lookup(struct inode *, struct dentry *, struct nameidata *); |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 107 | const struct inode_operations nfs4_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | .create = nfs_create, |
| 109 | .lookup = nfs_atomic_lookup, |
| 110 | .link = nfs_link, |
| 111 | .unlink = nfs_unlink, |
| 112 | .symlink = nfs_symlink, |
| 113 | .mkdir = nfs_mkdir, |
| 114 | .rmdir = nfs_rmdir, |
| 115 | .mknod = nfs_mknod, |
| 116 | .rename = nfs_rename, |
| 117 | .permission = nfs_permission, |
| 118 | .getattr = nfs_getattr, |
| 119 | .setattr = nfs_setattr, |
J. Bruce Fields | 6b3b549 | 2005-06-22 17:16:22 +0000 | [diff] [blame] | 120 | .getxattr = nfs4_getxattr, |
| 121 | .setxattr = nfs4_setxattr, |
| 122 | .listxattr = nfs4_listxattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 123 | }; |
| 124 | |
| 125 | #endif /* CONFIG_NFS_V4 */ |
| 126 | |
| 127 | /* |
| 128 | * Open file |
| 129 | */ |
| 130 | static int |
| 131 | nfs_opendir(struct inode *inode, struct file *filp) |
| 132 | { |
Carsten Otte | 7451c4f | 2006-04-19 13:06:37 -0400 | [diff] [blame] | 133 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 135 | dfprintk(VFS, "NFS: opendir(%s/%ld)\n", |
| 136 | inode->i_sb->s_id, inode->i_ino); |
| 137 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 138 | lock_kernel(); |
| 139 | /* Call generic open code in order to cache credentials */ |
Carsten Otte | 7451c4f | 2006-04-19 13:06:37 -0400 | [diff] [blame] | 140 | res = nfs_open(inode, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | unlock_kernel(); |
| 142 | return res; |
| 143 | } |
| 144 | |
Al Viro | 0dbb4c6 | 2006-10-19 23:28:49 -0700 | [diff] [blame] | 145 | typedef __be32 * (*decode_dirent_t)(__be32 *, struct nfs_entry *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 146 | typedef struct { |
| 147 | struct file *file; |
| 148 | struct page *page; |
| 149 | unsigned long page_index; |
Al Viro | 0dbb4c6 | 2006-10-19 23:28:49 -0700 | [diff] [blame] | 150 | __be32 *ptr; |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 151 | u64 *dir_cookie; |
| 152 | loff_t current_index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | struct nfs_entry *entry; |
| 154 | decode_dirent_t decode; |
| 155 | int plus; |
| 156 | int error; |
Neil Brown | 1f4eab7 | 2007-04-16 09:35:27 +1000 | [diff] [blame] | 157 | unsigned long timestamp; |
| 158 | int timestamp_valid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 159 | } nfs_readdir_descriptor_t; |
| 160 | |
| 161 | /* Now we cache directories properly, by stuffing the dirent |
| 162 | * data directly in the page cache. |
| 163 | * |
| 164 | * Inode invalidation due to refresh etc. takes care of |
| 165 | * _everything_, no sloppy entry flushing logic, no extraneous |
| 166 | * copying, network direct to page cache, the way it was meant |
| 167 | * to be. |
| 168 | * |
| 169 | * NOTE: Dirent information verification is done always by the |
| 170 | * page-in of the RPC reply, nowhere else, this simplies |
| 171 | * things substantially. |
| 172 | */ |
| 173 | static |
| 174 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page) |
| 175 | { |
| 176 | struct file *file = desc->file; |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 177 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 178 | struct rpc_cred *cred = nfs_file_cred(file); |
| 179 | unsigned long timestamp; |
| 180 | int error; |
| 181 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 182 | dfprintk(DIRCACHE, "NFS: %s: reading cookie %Lu into page %lu\n", |
| 183 | __FUNCTION__, (long long)desc->entry->cookie, |
| 184 | page->index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
| 186 | again: |
| 187 | timestamp = jiffies; |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 188 | error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, desc->entry->cookie, page, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | NFS_SERVER(inode)->dtsize, desc->plus); |
| 190 | if (error < 0) { |
| 191 | /* We requested READDIRPLUS, but the server doesn't grok it */ |
| 192 | if (error == -ENOTSUPP && desc->plus) { |
| 193 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; |
Chuck Lever | 412d582 | 2005-08-18 11:24:11 -0700 | [diff] [blame] | 194 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | desc->plus = 0; |
| 196 | goto again; |
| 197 | } |
| 198 | goto error; |
| 199 | } |
Neil Brown | 1f4eab7 | 2007-04-16 09:35:27 +1000 | [diff] [blame] | 200 | desc->timestamp = timestamp; |
| 201 | desc->timestamp_valid = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | SetPageUptodate(page); |
Chuck Lever | dc59250 | 2005-08-18 11:24:12 -0700 | [diff] [blame] | 203 | spin_lock(&inode->i_lock); |
Chuck Lever | 5529680 | 2005-08-18 11:24:09 -0700 | [diff] [blame] | 204 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME; |
Chuck Lever | dc59250 | 2005-08-18 11:24:12 -0700 | [diff] [blame] | 205 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | /* Ensure consistent page alignment of the data. |
| 207 | * Note: assumes we have exclusive access to this mapping either |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 208 | * through inode->i_mutex or some other mechanism. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | */ |
Trond Myklebust | cd9ae2b | 2006-10-19 23:28:40 -0700 | [diff] [blame] | 210 | if (page->index == 0 && invalidate_inode_pages2_range(inode->i_mapping, PAGE_CACHE_SIZE, -1) < 0) { |
| 211 | /* Should never happen */ |
| 212 | nfs_zap_mapping(inode, inode->i_mapping); |
| 213 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 214 | unlock_page(page); |
| 215 | return 0; |
| 216 | error: |
| 217 | SetPageError(page); |
| 218 | unlock_page(page); |
| 219 | nfs_zap_caches(inode); |
| 220 | desc->error = error; |
| 221 | return -EIO; |
| 222 | } |
| 223 | |
| 224 | static inline |
| 225 | int dir_decode(nfs_readdir_descriptor_t *desc) |
| 226 | { |
Al Viro | 0dbb4c6 | 2006-10-19 23:28:49 -0700 | [diff] [blame] | 227 | __be32 *p = desc->ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 228 | p = desc->decode(p, desc->entry, desc->plus); |
| 229 | if (IS_ERR(p)) |
| 230 | return PTR_ERR(p); |
| 231 | desc->ptr = p; |
Neil Brown | 1f4eab7 | 2007-04-16 09:35:27 +1000 | [diff] [blame] | 232 | if (desc->timestamp_valid) |
| 233 | desc->entry->fattr->time_start = desc->timestamp; |
| 234 | else |
| 235 | desc->entry->fattr->valid &= ~NFS_ATTR_FATTR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | return 0; |
| 237 | } |
| 238 | |
| 239 | static inline |
| 240 | void dir_page_release(nfs_readdir_descriptor_t *desc) |
| 241 | { |
| 242 | kunmap(desc->page); |
| 243 | page_cache_release(desc->page); |
| 244 | desc->page = NULL; |
| 245 | desc->ptr = NULL; |
| 246 | } |
| 247 | |
| 248 | /* |
| 249 | * 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] | 250 | * to readdir, find the next entry with cookie '*desc->dir_cookie'. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | * |
| 252 | * If the end of the buffer has been reached, return -EAGAIN, if not, |
| 253 | * return the offset within the buffer of the next entry to be |
| 254 | * read. |
| 255 | */ |
| 256 | static inline |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 257 | int find_dirent(nfs_readdir_descriptor_t *desc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | { |
| 259 | struct nfs_entry *entry = desc->entry; |
| 260 | int loop_count = 0, |
| 261 | status; |
| 262 | |
| 263 | while((status = dir_decode(desc)) == 0) { |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 264 | dfprintk(DIRCACHE, "NFS: %s: examining cookie %Lu\n", |
| 265 | __FUNCTION__, (unsigned long long)entry->cookie); |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 266 | if (entry->prev_cookie == *desc->dir_cookie) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 267 | break; |
| 268 | if (loop_count++ > 200) { |
| 269 | loop_count = 0; |
| 270 | schedule(); |
| 271 | } |
| 272 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 273 | return status; |
| 274 | } |
| 275 | |
| 276 | /* |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 277 | * 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] | 278 | * to readdir, find the entry at offset 'desc->file->f_pos'. |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 279 | * |
| 280 | * If the end of the buffer has been reached, return -EAGAIN, if not, |
| 281 | * return the offset within the buffer of the next entry to be |
| 282 | * read. |
| 283 | */ |
| 284 | static inline |
| 285 | int find_dirent_index(nfs_readdir_descriptor_t *desc) |
| 286 | { |
| 287 | struct nfs_entry *entry = desc->entry; |
| 288 | int loop_count = 0, |
| 289 | status; |
| 290 | |
| 291 | for(;;) { |
| 292 | status = dir_decode(desc); |
| 293 | if (status) |
| 294 | break; |
| 295 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 296 | dfprintk(DIRCACHE, "NFS: found cookie %Lu at index %Ld\n", |
| 297 | (unsigned long long)entry->cookie, desc->current_index); |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 298 | |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 299 | if (desc->file->f_pos == desc->current_index) { |
| 300 | *desc->dir_cookie = entry->cookie; |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 301 | break; |
| 302 | } |
| 303 | desc->current_index++; |
| 304 | if (loop_count++ > 200) { |
| 305 | loop_count = 0; |
| 306 | schedule(); |
| 307 | } |
| 308 | } |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 309 | return status; |
| 310 | } |
| 311 | |
| 312 | /* |
| 313 | * Find the given page, and call find_dirent() or find_dirent_index in |
| 314 | * order to try to return the next entry. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 315 | */ |
| 316 | static inline |
| 317 | int find_dirent_page(nfs_readdir_descriptor_t *desc) |
| 318 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 319 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 320 | struct page *page; |
| 321 | int status; |
| 322 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 323 | dfprintk(DIRCACHE, "NFS: %s: searching page %ld for target %Lu\n", |
| 324 | __FUNCTION__, desc->page_index, |
| 325 | (long long) *desc->dir_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 326 | |
Neil Brown | 1f4eab7 | 2007-04-16 09:35:27 +1000 | [diff] [blame] | 327 | /* If we find the page in the page_cache, we cannot be sure |
| 328 | * how fresh the data is, so we will ignore readdir_plus attributes. |
| 329 | */ |
| 330 | desc->timestamp_valid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | page = read_cache_page(inode->i_mapping, desc->page_index, |
| 332 | (filler_t *)nfs_readdir_filler, desc); |
| 333 | if (IS_ERR(page)) { |
| 334 | status = PTR_ERR(page); |
| 335 | goto out; |
| 336 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 337 | |
| 338 | /* NOTE: Someone else may have changed the READDIRPLUS flag */ |
| 339 | desc->page = page; |
| 340 | desc->ptr = kmap(page); /* matching kunmap in nfs_do_filldir */ |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 341 | if (*desc->dir_cookie != 0) |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 342 | status = find_dirent(desc); |
| 343 | else |
| 344 | status = find_dirent_index(desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | if (status < 0) |
| 346 | dir_page_release(desc); |
| 347 | out: |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 348 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __FUNCTION__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 349 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | } |
| 351 | |
| 352 | /* |
| 353 | * Recurse through the page cache pages, and return a |
| 354 | * filled nfs_entry structure of the next directory entry if possible. |
| 355 | * |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 356 | * The target for the search is '*desc->dir_cookie' if non-0, |
| 357 | * 'desc->file->f_pos' otherwise |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | */ |
| 359 | static inline |
| 360 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) |
| 361 | { |
| 362 | int loop_count = 0; |
| 363 | int res; |
| 364 | |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 365 | /* Always search-by-index from the beginning of the cache */ |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 366 | if (*desc->dir_cookie == 0) { |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 367 | dfprintk(DIRCACHE, "NFS: readdir_search_pagecache() searching for offset %Ld\n", |
| 368 | (long long)desc->file->f_pos); |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 369 | desc->page_index = 0; |
| 370 | desc->entry->cookie = desc->entry->prev_cookie = 0; |
| 371 | desc->entry->eof = 0; |
| 372 | desc->current_index = 0; |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 373 | } else |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 374 | dfprintk(DIRCACHE, "NFS: readdir_search_pagecache() searching for cookie %Lu\n", |
| 375 | (unsigned long long)*desc->dir_cookie); |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 376 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 377 | for (;;) { |
| 378 | res = find_dirent_page(desc); |
| 379 | if (res != -EAGAIN) |
| 380 | break; |
| 381 | /* Align to beginning of next page */ |
| 382 | desc->page_index ++; |
| 383 | if (loop_count++ > 200) { |
| 384 | loop_count = 0; |
| 385 | schedule(); |
| 386 | } |
| 387 | } |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 388 | |
| 389 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __FUNCTION__, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 390 | return res; |
| 391 | } |
| 392 | |
| 393 | static inline unsigned int dt_type(struct inode *inode) |
| 394 | { |
| 395 | return (inode->i_mode >> 12) & 15; |
| 396 | } |
| 397 | |
| 398 | static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc); |
| 399 | |
| 400 | /* |
| 401 | * Once we've found the start of the dirent within a page: fill 'er up... |
| 402 | */ |
| 403 | static |
| 404 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, |
| 405 | filldir_t filldir) |
| 406 | { |
| 407 | struct file *file = desc->file; |
| 408 | struct nfs_entry *entry = desc->entry; |
| 409 | struct dentry *dentry = NULL; |
Peter Staubach | 4e769b9 | 2007-08-03 15:07:10 -0400 | [diff] [blame] | 410 | u64 fileid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | int loop_count = 0, |
| 412 | res; |
| 413 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 414 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling starting @ cookie %Lu\n", |
| 415 | (unsigned long long)entry->cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | |
| 417 | for(;;) { |
| 418 | unsigned d_type = DT_UNKNOWN; |
| 419 | /* Note: entry->prev_cookie contains the cookie for |
| 420 | * retrieving the current dirent on the server */ |
Peter Staubach | 4e769b9 | 2007-08-03 15:07:10 -0400 | [diff] [blame] | 421 | fileid = entry->ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 422 | |
| 423 | /* Get a dentry if we have one */ |
| 424 | if (dentry != NULL) |
| 425 | dput(dentry); |
| 426 | dentry = nfs_readdir_lookup(desc); |
| 427 | |
| 428 | /* Use readdirplus info */ |
| 429 | if (dentry != NULL && dentry->d_inode != NULL) { |
| 430 | d_type = dt_type(dentry->d_inode); |
Peter Staubach | 4e769b9 | 2007-08-03 15:07:10 -0400 | [diff] [blame] | 431 | fileid = NFS_FILEID(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | } |
| 433 | |
| 434 | res = filldir(dirent, entry->name, entry->len, |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 435 | file->f_pos, fileid, d_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | if (res < 0) |
| 437 | break; |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 438 | file->f_pos++; |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 439 | *desc->dir_cookie = entry->cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 440 | if (dir_decode(desc) != 0) { |
| 441 | desc->page_index ++; |
| 442 | break; |
| 443 | } |
| 444 | if (loop_count++ > 200) { |
| 445 | loop_count = 0; |
| 446 | schedule(); |
| 447 | } |
| 448 | } |
| 449 | dir_page_release(desc); |
| 450 | if (dentry != NULL) |
| 451 | dput(dentry); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 452 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
| 453 | (unsigned long long)*desc->dir_cookie, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | return res; |
| 455 | } |
| 456 | |
| 457 | /* |
| 458 | * If we cannot find a cookie in our cache, we suspect that this is |
| 459 | * because it points to a deleted file, so we ask the server to return |
| 460 | * whatever it thinks is the next entry. We then feed this to filldir. |
| 461 | * If all goes well, we should then be able to find our way round the |
| 462 | * cache on the next call to readdir_search_pagecache(); |
| 463 | * |
| 464 | * NOTE: we cannot add the anonymous page to the pagecache because |
| 465 | * the data it contains might not be page aligned. Besides, |
| 466 | * we should already have a complete representation of the |
| 467 | * directory in the page cache by the time we get here. |
| 468 | */ |
| 469 | static inline |
| 470 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, |
| 471 | filldir_t filldir) |
| 472 | { |
| 473 | struct file *file = desc->file; |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 474 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | struct rpc_cred *cred = nfs_file_cred(file); |
| 476 | struct page *page = NULL; |
| 477 | int status; |
Neil Brown | 1f4eab7 | 2007-04-16 09:35:27 +1000 | [diff] [blame] | 478 | unsigned long timestamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 480 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
| 481 | (unsigned long long)*desc->dir_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | |
| 483 | page = alloc_page(GFP_HIGHUSER); |
| 484 | if (!page) { |
| 485 | status = -ENOMEM; |
| 486 | goto out; |
| 487 | } |
Neil Brown | 1f4eab7 | 2007-04-16 09:35:27 +1000 | [diff] [blame] | 488 | timestamp = jiffies; |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 489 | desc->error = NFS_PROTO(inode)->readdir(file->f_path.dentry, cred, *desc->dir_cookie, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | page, |
| 491 | NFS_SERVER(inode)->dtsize, |
| 492 | desc->plus); |
Chuck Lever | dc59250 | 2005-08-18 11:24:12 -0700 | [diff] [blame] | 493 | spin_lock(&inode->i_lock); |
Chuck Lever | 5529680 | 2005-08-18 11:24:09 -0700 | [diff] [blame] | 494 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_ATIME; |
Chuck Lever | dc59250 | 2005-08-18 11:24:12 -0700 | [diff] [blame] | 495 | spin_unlock(&inode->i_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 496 | desc->page = page; |
| 497 | desc->ptr = kmap(page); /* matching kunmap in nfs_do_filldir */ |
| 498 | if (desc->error >= 0) { |
Neil Brown | 1f4eab7 | 2007-04-16 09:35:27 +1000 | [diff] [blame] | 499 | desc->timestamp = timestamp; |
| 500 | desc->timestamp_valid = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | if ((status = dir_decode(desc)) == 0) |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 502 | desc->entry->prev_cookie = *desc->dir_cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 503 | } else |
| 504 | status = -EIO; |
| 505 | if (status < 0) |
| 506 | goto out_release; |
| 507 | |
| 508 | status = nfs_do_filldir(desc, dirent, filldir); |
| 509 | |
| 510 | /* Reset read descriptor so it searches the page cache from |
| 511 | * the start upon the next call to readdir_search_pagecache() */ |
| 512 | desc->page_index = 0; |
| 513 | desc->entry->cookie = desc->entry->prev_cookie = 0; |
| 514 | desc->entry->eof = 0; |
| 515 | out: |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 516 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
| 517 | __FUNCTION__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 518 | return status; |
| 519 | out_release: |
| 520 | dir_page_release(desc); |
| 521 | goto out; |
| 522 | } |
| 523 | |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 524 | /* The file offset position represents the dirent entry number. A |
| 525 | last cookie cache takes care of the common case of reading the |
| 526 | whole directory. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 527 | */ |
| 528 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) |
| 529 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 530 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 531 | struct inode *inode = dentry->d_inode; |
| 532 | nfs_readdir_descriptor_t my_desc, |
| 533 | *desc = &my_desc; |
| 534 | struct nfs_entry my_entry; |
| 535 | struct nfs_fh fh; |
| 536 | struct nfs_fattr fattr; |
| 537 | long res; |
| 538 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 539 | dfprintk(VFS, "NFS: readdir(%s/%s) starting at cookie %Lu\n", |
| 540 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 541 | (long long)filp->f_pos); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 542 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
| 543 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 544 | lock_kernel(); |
| 545 | |
Trond Myklebust | 717d44e | 2007-01-24 11:54:55 -0800 | [diff] [blame] | 546 | res = nfs_revalidate_mapping_nolock(inode, filp->f_mapping); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 547 | if (res < 0) { |
| 548 | unlock_kernel(); |
| 549 | return res; |
| 550 | } |
| 551 | |
| 552 | /* |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 553 | * filp->f_pos points to the dirent entry number. |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 554 | * *desc->dir_cookie has the cookie for the next entry. We have |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 555 | * to either find the entry with the appropriate number or |
| 556 | * revalidate the cookie. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 557 | */ |
| 558 | memset(desc, 0, sizeof(*desc)); |
| 559 | |
| 560 | desc->file = filp; |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame^] | 561 | desc->dir_cookie = &nfs_file_open_context(filp)->dir_cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 562 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
| 563 | desc->plus = NFS_USE_READDIRPLUS(inode); |
| 564 | |
| 565 | my_entry.cookie = my_entry.prev_cookie = 0; |
| 566 | my_entry.eof = 0; |
| 567 | my_entry.fh = &fh; |
| 568 | my_entry.fattr = &fattr; |
Trond Myklebust | 0e574af | 2005-10-27 22:12:38 -0400 | [diff] [blame] | 569 | nfs_fattr_init(&fattr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 570 | desc->entry = &my_entry; |
| 571 | |
| 572 | while(!desc->entry->eof) { |
| 573 | res = readdir_search_pagecache(desc); |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 574 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 575 | if (res == -EBADCOOKIE) { |
| 576 | /* This means either end of directory */ |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 577 | if (*desc->dir_cookie && desc->entry->cookie != *desc->dir_cookie) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 578 | /* Or that the server has 'lost' a cookie */ |
| 579 | res = uncached_readdir(desc, dirent, filldir); |
| 580 | if (res >= 0) |
| 581 | continue; |
| 582 | } |
| 583 | res = 0; |
| 584 | break; |
| 585 | } |
| 586 | if (res == -ETOOSMALL && desc->plus) { |
Chuck Lever | 412d582 | 2005-08-18 11:24:11 -0700 | [diff] [blame] | 587 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 588 | nfs_zap_caches(inode); |
| 589 | desc->plus = 0; |
| 590 | desc->entry->eof = 0; |
| 591 | continue; |
| 592 | } |
| 593 | if (res < 0) |
| 594 | break; |
| 595 | |
| 596 | res = nfs_do_filldir(desc, dirent, filldir); |
| 597 | if (res < 0) { |
| 598 | res = 0; |
| 599 | break; |
| 600 | } |
| 601 | } |
| 602 | unlock_kernel(); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 603 | if (res > 0) |
| 604 | res = 0; |
| 605 | dfprintk(VFS, "NFS: readdir(%s/%s) returns %ld\n", |
| 606 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 607 | res); |
| 608 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | } |
| 610 | |
Trond Myklebust | 10afec9 | 2007-05-14 17:16:04 -0400 | [diff] [blame] | 611 | static loff_t nfs_llseek_dir(struct file *filp, loff_t offset, int origin) |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 612 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 613 | mutex_lock(&filp->f_path.dentry->d_inode->i_mutex); |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 614 | switch (origin) { |
| 615 | case 1: |
| 616 | offset += filp->f_pos; |
| 617 | case 0: |
| 618 | if (offset >= 0) |
| 619 | break; |
| 620 | default: |
| 621 | offset = -EINVAL; |
| 622 | goto out; |
| 623 | } |
| 624 | if (offset != filp->f_pos) { |
| 625 | filp->f_pos = offset; |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame^] | 626 | nfs_file_open_context(filp)->dir_cookie = 0; |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 627 | } |
| 628 | out: |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 629 | mutex_unlock(&filp->f_path.dentry->d_inode->i_mutex); |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 630 | return offset; |
| 631 | } |
| 632 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | /* |
| 634 | * All directory operations under NFS are synchronous, so fsync() |
| 635 | * is a dummy operation. |
| 636 | */ |
Trond Myklebust | 10afec9 | 2007-05-14 17:16:04 -0400 | [diff] [blame] | 637 | static int nfs_fsync_dir(struct file *filp, struct dentry *dentry, int datasync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | { |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 639 | dfprintk(VFS, "NFS: fsync_dir(%s/%s) datasync %d\n", |
| 640 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 641 | datasync); |
| 642 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 643 | return 0; |
| 644 | } |
| 645 | |
| 646 | /* |
| 647 | * A check for whether or not the parent directory has changed. |
| 648 | * In the case it has, we assume that the dentries are untrustworthy |
| 649 | * and may need to be looked up again. |
| 650 | */ |
Trond Myklebust | c79ba78 | 2007-01-31 08:16:24 -0500 | [diff] [blame] | 651 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 652 | { |
Trond Myklebust | e62c2bb | 2007-05-09 09:00:17 -0400 | [diff] [blame] | 653 | unsigned long verf; |
| 654 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 655 | if (IS_ROOT(dentry)) |
| 656 | return 1; |
Trond Myklebust | 3062c53 | 2007-07-14 17:36:45 -0400 | [diff] [blame] | 657 | verf = dentry->d_time; |
Trond Myklebust | e70c490 | 2007-05-09 09:00:18 -0400 | [diff] [blame] | 658 | if (nfs_caches_unstable(dir) |
Trond Myklebust | e62c2bb | 2007-05-09 09:00:17 -0400 | [diff] [blame] | 659 | || verf != NFS_I(dir)->cache_change_attribute) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 660 | return 0; |
Trond Myklebust | e62c2bb | 2007-05-09 09:00:17 -0400 | [diff] [blame] | 661 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | } |
| 663 | |
| 664 | static inline void nfs_set_verifier(struct dentry * dentry, unsigned long verf) |
| 665 | { |
Trond Myklebust | 3062c53 | 2007-07-14 17:36:45 -0400 | [diff] [blame] | 666 | dentry->d_time = verf; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 667 | } |
| 668 | |
| 669 | /* |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 670 | * Return the intent data that applies to this particular path component |
| 671 | * |
| 672 | * Note that the current set of intents only apply to the very last |
| 673 | * component of the path. |
| 674 | * We check for this using LOOKUP_CONTINUE and LOOKUP_PARENT. |
| 675 | */ |
| 676 | static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, unsigned int mask) |
| 677 | { |
| 678 | if (nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT)) |
| 679 | return 0; |
| 680 | return nd->flags & mask; |
| 681 | } |
| 682 | |
| 683 | /* |
| 684 | * Inode and filehandle revalidation for lookups. |
| 685 | * |
| 686 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, |
| 687 | * or if the intent information indicates that we're about to open this |
| 688 | * particular file and the "nocto" mount flag is not set. |
| 689 | * |
| 690 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 691 | static inline |
| 692 | int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd) |
| 693 | { |
| 694 | struct nfs_server *server = NFS_SERVER(inode); |
| 695 | |
| 696 | if (nd != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 697 | /* VFS wants an on-the-wire revalidation */ |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 698 | if (nd->flags & LOOKUP_REVAL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 699 | goto out_force; |
| 700 | /* This is an open(2) */ |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 701 | if (nfs_lookup_check_intent(nd, LOOKUP_OPEN) != 0 && |
Trond Myklebust | 4e0641a | 2006-07-05 13:05:13 -0400 | [diff] [blame] | 702 | !(server->flags & NFS_MOUNT_NOCTO) && |
| 703 | (S_ISREG(inode->i_mode) || |
| 704 | S_ISDIR(inode->i_mode))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | goto out_force; |
| 706 | } |
| 707 | return nfs_revalidate_inode(server, inode); |
| 708 | out_force: |
| 709 | return __nfs_revalidate_inode(server, inode); |
| 710 | } |
| 711 | |
| 712 | /* |
| 713 | * We judge how long we want to trust negative |
| 714 | * dentries by looking at the parent inode mtime. |
| 715 | * |
| 716 | * If parent mtime has changed, we revalidate, else we wait for a |
| 717 | * period corresponding to the parent's attribute cache timeout value. |
| 718 | */ |
| 719 | static inline |
| 720 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, |
| 721 | struct nameidata *nd) |
| 722 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 723 | /* 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] | 724 | if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | return 0; |
| 726 | return !nfs_check_verifier(dir, dentry); |
| 727 | } |
| 728 | |
| 729 | /* |
| 730 | * This is called every time the dcache has a lookup hit, |
| 731 | * and we should check whether we can really trust that |
| 732 | * lookup. |
| 733 | * |
| 734 | * NOTE! The hit can be a negative hit too, don't assume |
| 735 | * we have an inode! |
| 736 | * |
| 737 | * If the parent directory is seen to have changed, we throw out the |
| 738 | * cached dentry and do a new lookup. |
| 739 | */ |
| 740 | static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd) |
| 741 | { |
| 742 | struct inode *dir; |
| 743 | struct inode *inode; |
| 744 | struct dentry *parent; |
| 745 | int error; |
| 746 | struct nfs_fh fhandle; |
| 747 | struct nfs_fattr fattr; |
| 748 | unsigned long verifier; |
| 749 | |
| 750 | parent = dget_parent(dentry); |
| 751 | lock_kernel(); |
| 752 | dir = parent->d_inode; |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 753 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 754 | inode = dentry->d_inode; |
| 755 | |
Trond Myklebust | e70c490 | 2007-05-09 09:00:18 -0400 | [diff] [blame] | 756 | /* Revalidate parent directory attribute cache */ |
| 757 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) |
| 758 | goto out_zap_parent; |
| 759 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 760 | if (!inode) { |
| 761 | if (nfs_neg_need_reval(dir, dentry, nd)) |
| 762 | goto out_bad; |
| 763 | goto out_valid; |
| 764 | } |
| 765 | |
| 766 | if (is_bad_inode(inode)) { |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 767 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
| 768 | __FUNCTION__, dentry->d_parent->d_name.name, |
| 769 | dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 770 | goto out_bad; |
| 771 | } |
| 772 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | /* Force a full look up iff the parent directory has changed */ |
| 774 | if (nfs_check_verifier(dir, dentry)) { |
| 775 | if (nfs_lookup_verify_inode(inode, nd)) |
| 776 | goto out_zap_parent; |
| 777 | goto out_valid; |
| 778 | } |
| 779 | |
| 780 | if (NFS_STALE(inode)) |
| 781 | goto out_bad; |
| 782 | |
| 783 | verifier = nfs_save_change_attribute(dir); |
| 784 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr); |
| 785 | if (error) |
| 786 | goto out_bad; |
| 787 | if (nfs_compare_fh(NFS_FH(inode), &fhandle)) |
| 788 | goto out_bad; |
| 789 | if ((error = nfs_refresh_inode(inode, &fattr)) != 0) |
| 790 | goto out_bad; |
| 791 | |
Chuck Lever | 8fb559f | 2007-09-24 15:40:16 -0400 | [diff] [blame] | 792 | nfs_set_verifier(dentry, verifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 793 | out_valid: |
| 794 | unlock_kernel(); |
| 795 | dput(parent); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 796 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
| 797 | __FUNCTION__, dentry->d_parent->d_name.name, |
| 798 | dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 799 | return 1; |
| 800 | out_zap_parent: |
| 801 | nfs_zap_caches(dir); |
| 802 | out_bad: |
| 803 | NFS_CACHEINV(dir); |
| 804 | if (inode && S_ISDIR(inode->i_mode)) { |
| 805 | /* Purge readdir caches. */ |
| 806 | nfs_zap_caches(inode); |
| 807 | /* If we have submounts, don't unhash ! */ |
| 808 | if (have_submounts(dentry)) |
| 809 | goto out_valid; |
| 810 | shrink_dcache_parent(dentry); |
| 811 | } |
| 812 | d_drop(dentry); |
| 813 | unlock_kernel(); |
| 814 | dput(parent); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 815 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
| 816 | __FUNCTION__, dentry->d_parent->d_name.name, |
| 817 | dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | return 0; |
| 819 | } |
| 820 | |
| 821 | /* |
| 822 | * This is called from dput() when d_count is going to 0. |
| 823 | */ |
| 824 | static int nfs_dentry_delete(struct dentry *dentry) |
| 825 | { |
| 826 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", |
| 827 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 828 | dentry->d_flags); |
| 829 | |
| 830 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
| 831 | /* Unhash it, so that ->d_iput() would be called */ |
| 832 | return 1; |
| 833 | } |
| 834 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { |
| 835 | /* Unhash it, so that ancestors of killed async unlink |
| 836 | * files will be cleaned up during umount */ |
| 837 | return 1; |
| 838 | } |
| 839 | return 0; |
| 840 | |
| 841 | } |
| 842 | |
| 843 | /* |
| 844 | * Called when the dentry loses inode. |
| 845 | * We use it to clean up silly-renamed files. |
| 846 | */ |
| 847 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) |
| 848 | { |
Trond Myklebust | cae7a07 | 2005-10-18 14:20:19 -0700 | [diff] [blame] | 849 | nfs_inode_return_delegation(inode); |
Neil Brown | 83672d3 | 2007-02-26 12:48:25 +1100 | [diff] [blame] | 850 | if (S_ISDIR(inode->i_mode)) |
| 851 | /* drop any readdir cache as it could easily be old */ |
| 852 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; |
| 853 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 854 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
| 855 | lock_kernel(); |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 856 | drop_nlink(inode); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 857 | nfs_complete_unlink(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | unlock_kernel(); |
| 859 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 860 | iput(inode); |
| 861 | } |
| 862 | |
| 863 | struct dentry_operations nfs_dentry_operations = { |
| 864 | .d_revalidate = nfs_lookup_revalidate, |
| 865 | .d_delete = nfs_dentry_delete, |
| 866 | .d_iput = nfs_dentry_iput, |
| 867 | }; |
| 868 | |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 869 | /* |
| 870 | * Use intent information to check whether or not we're going to do |
| 871 | * an O_EXCL create using this path component. |
| 872 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 873 | static inline |
| 874 | int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd) |
| 875 | { |
| 876 | if (NFS_PROTO(dir)->version == 2) |
| 877 | return 0; |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 878 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_CREATE) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 879 | return 0; |
| 880 | return (nd->intent.open.flags & O_EXCL) != 0; |
| 881 | } |
| 882 | |
Trond Myklebust | a035686 | 2007-06-05 13:26:15 -0400 | [diff] [blame] | 883 | static inline int nfs_reval_fsid(struct inode *dir, const struct nfs_fattr *fattr) |
Trond Myklebust | 55a9759 | 2006-06-09 09:34:19 -0400 | [diff] [blame] | 884 | { |
| 885 | struct nfs_server *server = NFS_SERVER(dir); |
| 886 | |
| 887 | if (!nfs_fsid_equal(&server->fsid, &fattr->fsid)) |
Trond Myklebust | a035686 | 2007-06-05 13:26:15 -0400 | [diff] [blame] | 888 | /* Revalidate fsid using the parent directory */ |
| 889 | return __nfs_revalidate_inode(server, dir); |
Trond Myklebust | 55a9759 | 2006-06-09 09:34:19 -0400 | [diff] [blame] | 890 | return 0; |
| 891 | } |
| 892 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 893 | static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| 894 | { |
| 895 | struct dentry *res; |
| 896 | struct inode *inode = NULL; |
| 897 | int error; |
| 898 | struct nfs_fh fhandle; |
| 899 | struct nfs_fattr fattr; |
| 900 | |
| 901 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", |
| 902 | dentry->d_parent->d_name.name, dentry->d_name.name); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 903 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 904 | |
| 905 | res = ERR_PTR(-ENAMETOOLONG); |
| 906 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
| 907 | goto out; |
| 908 | |
| 909 | res = ERR_PTR(-ENOMEM); |
| 910 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; |
| 911 | |
| 912 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 913 | |
Trond Myklebust | fd68407 | 2006-09-05 12:27:44 -0400 | [diff] [blame] | 914 | /* |
| 915 | * If we're doing an exclusive create, optimize away the lookup |
| 916 | * but don't hash the dentry. |
| 917 | */ |
| 918 | if (nfs_is_exclusive_create(dir, nd)) { |
| 919 | d_instantiate(dentry, NULL); |
| 920 | res = NULL; |
| 921 | goto out_unlock; |
| 922 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 923 | |
| 924 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr); |
| 925 | if (error == -ENOENT) |
| 926 | goto no_entry; |
| 927 | if (error < 0) { |
| 928 | res = ERR_PTR(error); |
| 929 | goto out_unlock; |
| 930 | } |
Trond Myklebust | a035686 | 2007-06-05 13:26:15 -0400 | [diff] [blame] | 931 | error = nfs_reval_fsid(dir, &fattr); |
Trond Myklebust | 55a9759 | 2006-06-09 09:34:19 -0400 | [diff] [blame] | 932 | if (error < 0) { |
| 933 | res = ERR_PTR(error); |
| 934 | goto out_unlock; |
| 935 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 936 | inode = nfs_fhget(dentry->d_sb, &fhandle, &fattr); |
Trond Myklebust | 03f28e3 | 2006-03-20 13:44:48 -0500 | [diff] [blame] | 937 | res = (struct dentry *)inode; |
| 938 | if (IS_ERR(res)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | goto out_unlock; |
David Howells | 54ceac4 | 2006-08-22 20:06:13 -0400 | [diff] [blame] | 940 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | no_entry: |
David Howells | 54ceac4 | 2006-08-22 20:06:13 -0400 | [diff] [blame] | 942 | res = d_materialise_unique(dentry, inode); |
Trond Myklebust | 9eaef27 | 2006-10-21 10:24:20 -0700 | [diff] [blame] | 943 | if (res != NULL) { |
Trond Myklebust | fc22617 | 2006-10-21 10:24:24 -0700 | [diff] [blame] | 944 | struct dentry *parent; |
Trond Myklebust | 9eaef27 | 2006-10-21 10:24:20 -0700 | [diff] [blame] | 945 | if (IS_ERR(res)) |
| 946 | goto out_unlock; |
Trond Myklebust | fc22617 | 2006-10-21 10:24:24 -0700 | [diff] [blame] | 947 | /* Was a directory renamed! */ |
| 948 | parent = dget_parent(res); |
| 949 | if (!IS_ROOT(parent)) |
| 950 | nfs_mark_for_revalidate(parent->d_inode); |
| 951 | dput(parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 952 | dentry = res; |
Trond Myklebust | 9eaef27 | 2006-10-21 10:24:20 -0700 | [diff] [blame] | 953 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 955 | out_unlock: |
| 956 | unlock_kernel(); |
| 957 | out: |
| 958 | return res; |
| 959 | } |
| 960 | |
| 961 | #ifdef CONFIG_NFS_V4 |
| 962 | static int nfs_open_revalidate(struct dentry *, struct nameidata *); |
| 963 | |
| 964 | struct dentry_operations nfs4_dentry_operations = { |
| 965 | .d_revalidate = nfs_open_revalidate, |
| 966 | .d_delete = nfs_dentry_delete, |
| 967 | .d_iput = nfs_dentry_iput, |
| 968 | }; |
| 969 | |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 970 | /* |
| 971 | * Use intent information to determine whether we need to substitute |
| 972 | * the NFSv4-style stateful OPEN for the LOOKUP call |
| 973 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 974 | static int is_atomic_open(struct inode *dir, struct nameidata *nd) |
| 975 | { |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 976 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_OPEN) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 977 | return 0; |
| 978 | /* NFS does not (yet) have a stateful open for directories */ |
| 979 | if (nd->flags & LOOKUP_DIRECTORY) |
| 980 | return 0; |
| 981 | /* Are we trying to write to a read only partition? */ |
| 982 | if (IS_RDONLY(dir) && (nd->intent.open.flags & (O_CREAT|O_TRUNC|FMODE_WRITE))) |
| 983 | return 0; |
| 984 | return 1; |
| 985 | } |
| 986 | |
| 987 | static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
| 988 | { |
| 989 | struct dentry *res = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 990 | int error; |
| 991 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 992 | dfprintk(VFS, "NFS: atomic_lookup(%s/%ld), %s\n", |
| 993 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
| 994 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | /* Check that we are indeed trying to open this file */ |
| 996 | if (!is_atomic_open(dir, nd)) |
| 997 | goto no_open; |
| 998 | |
| 999 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) { |
| 1000 | res = ERR_PTR(-ENAMETOOLONG); |
| 1001 | goto out; |
| 1002 | } |
| 1003 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; |
| 1004 | |
| 1005 | /* Let vfs_create() deal with O_EXCL */ |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 1006 | if (nd->intent.open.flags & O_EXCL) { |
| 1007 | d_add(dentry, NULL); |
| 1008 | goto out; |
| 1009 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1010 | |
| 1011 | /* Open the file on the server */ |
| 1012 | lock_kernel(); |
| 1013 | /* Revalidate parent directory attribute cache */ |
| 1014 | error = nfs_revalidate_inode(NFS_SERVER(dir), dir); |
| 1015 | if (error < 0) { |
| 1016 | res = ERR_PTR(error); |
Steve Dickson | 01c314a | 2005-08-19 17:57:48 -0700 | [diff] [blame] | 1017 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1018 | goto out; |
| 1019 | } |
| 1020 | |
| 1021 | if (nd->intent.open.flags & O_CREAT) { |
| 1022 | nfs_begin_data_update(dir); |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 1023 | res = nfs4_atomic_open(dir, dentry, nd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | nfs_end_data_update(dir); |
| 1025 | } else |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 1026 | res = nfs4_atomic_open(dir, dentry, nd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1027 | unlock_kernel(); |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 1028 | if (IS_ERR(res)) { |
| 1029 | error = PTR_ERR(res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | switch (error) { |
| 1031 | /* Make a negative dentry */ |
| 1032 | case -ENOENT: |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 1033 | res = NULL; |
| 1034 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1035 | /* This turned out not to be a regular file */ |
Trond Myklebust | 6f926b5 | 2005-10-18 14:20:18 -0700 | [diff] [blame] | 1036 | case -EISDIR: |
| 1037 | case -ENOTDIR: |
| 1038 | goto no_open; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1039 | case -ELOOP: |
| 1040 | if (!(nd->intent.open.flags & O_NOFOLLOW)) |
| 1041 | goto no_open; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1042 | /* case -EINVAL: */ |
| 1043 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1044 | goto out; |
| 1045 | } |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 1046 | } else if (res != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | dentry = res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 1049 | out: |
| 1050 | return res; |
| 1051 | no_open: |
| 1052 | return nfs_lookup(dir, dentry, nd); |
| 1053 | } |
| 1054 | |
| 1055 | static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 1056 | { |
| 1057 | struct dentry *parent = NULL; |
| 1058 | struct inode *inode = dentry->d_inode; |
| 1059 | struct inode *dir; |
| 1060 | unsigned long verifier; |
| 1061 | int openflags, ret = 0; |
| 1062 | |
| 1063 | parent = dget_parent(dentry); |
| 1064 | dir = parent->d_inode; |
| 1065 | if (!is_atomic_open(dir, nd)) |
| 1066 | goto no_open; |
| 1067 | /* We can't create new files in nfs_open_revalidate(), so we |
| 1068 | * optimize away revalidation of negative dentries. |
| 1069 | */ |
| 1070 | if (inode == NULL) |
| 1071 | goto out; |
| 1072 | /* NFS only supports OPEN on regular files */ |
| 1073 | if (!S_ISREG(inode->i_mode)) |
| 1074 | goto no_open; |
| 1075 | openflags = nd->intent.open.flags; |
| 1076 | /* We cannot do exclusive creation on a positive dentry */ |
| 1077 | if ((openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) |
| 1078 | goto no_open; |
| 1079 | /* We can't create new files, or truncate existing ones here */ |
| 1080 | openflags &= ~(O_CREAT|O_TRUNC); |
| 1081 | |
| 1082 | /* |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 1083 | * 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] | 1084 | * operations that change the directory. We therefore save the |
| 1085 | * change attribute *before* we do the RPC call. |
| 1086 | */ |
| 1087 | lock_kernel(); |
| 1088 | verifier = nfs_save_change_attribute(dir); |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 1089 | ret = nfs4_open_revalidate(dir, dentry, openflags, nd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1090 | if (!ret) |
Chuck Lever | 8fb559f | 2007-09-24 15:40:16 -0400 | [diff] [blame] | 1091 | nfs_set_verifier(dentry, verifier); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1092 | unlock_kernel(); |
| 1093 | out: |
| 1094 | dput(parent); |
| 1095 | if (!ret) |
| 1096 | d_drop(dentry); |
| 1097 | return ret; |
| 1098 | no_open: |
| 1099 | dput(parent); |
| 1100 | if (inode != NULL && nfs_have_delegation(inode, FMODE_READ)) |
| 1101 | return 1; |
| 1102 | return nfs_lookup_revalidate(dentry, nd); |
| 1103 | } |
| 1104 | #endif /* CONFIG_NFSV4 */ |
| 1105 | |
| 1106 | static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc) |
| 1107 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 1108 | struct dentry *parent = desc->file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1109 | struct inode *dir = parent->d_inode; |
| 1110 | struct nfs_entry *entry = desc->entry; |
| 1111 | struct dentry *dentry, *alias; |
| 1112 | struct qstr name = { |
| 1113 | .name = entry->name, |
| 1114 | .len = entry->len, |
| 1115 | }; |
| 1116 | struct inode *inode; |
| 1117 | |
| 1118 | switch (name.len) { |
| 1119 | case 2: |
| 1120 | if (name.name[0] == '.' && name.name[1] == '.') |
| 1121 | return dget_parent(parent); |
| 1122 | break; |
| 1123 | case 1: |
| 1124 | if (name.name[0] == '.') |
| 1125 | return dget(parent); |
| 1126 | } |
| 1127 | name.hash = full_name_hash(name.name, name.len); |
| 1128 | dentry = d_lookup(parent, &name); |
Trond Myklebust | df1d5d2 | 2007-01-15 13:56:29 -0500 | [diff] [blame] | 1129 | if (dentry != NULL) { |
Trond Myklebust | ef75c79 | 2007-01-16 10:09:44 -0500 | [diff] [blame] | 1130 | /* Is this a positive dentry that matches the readdir info? */ |
| 1131 | if (dentry->d_inode != NULL && |
| 1132 | (NFS_FILEID(dentry->d_inode) == entry->ino || |
| 1133 | d_mountpoint(dentry))) { |
| 1134 | if (!desc->plus || entry->fh->size == 0) |
| 1135 | return dentry; |
| 1136 | if (nfs_compare_fh(NFS_FH(dentry->d_inode), |
| 1137 | entry->fh) == 0) |
| 1138 | goto out_renew; |
| 1139 | } |
Trond Myklebust | df1d5d2 | 2007-01-15 13:56:29 -0500 | [diff] [blame] | 1140 | /* No, so d_drop to allow one to be created */ |
| 1141 | d_drop(dentry); |
| 1142 | dput(dentry); |
| 1143 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | if (!desc->plus || !(entry->fattr->valid & NFS_ATTR_FATTR)) |
| 1145 | return NULL; |
Trond Myklebust | 54af3bb | 2007-09-28 12:27:41 -0400 | [diff] [blame] | 1146 | if (name.len > NFS_SERVER(dir)->namelen) |
| 1147 | return NULL; |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 1148 | /* Note: caller is already holding the dir->i_mutex! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | dentry = d_alloc(parent, &name); |
| 1150 | if (dentry == NULL) |
| 1151 | return NULL; |
| 1152 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; |
| 1153 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); |
Trond Myklebust | 03f28e3 | 2006-03-20 13:44:48 -0500 | [diff] [blame] | 1154 | if (IS_ERR(inode)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | dput(dentry); |
| 1156 | return NULL; |
| 1157 | } |
David Howells | 54ceac4 | 2006-08-22 20:06:13 -0400 | [diff] [blame] | 1158 | |
| 1159 | alias = d_materialise_unique(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1160 | if (alias != NULL) { |
| 1161 | dput(dentry); |
Trond Myklebust | 9eaef27 | 2006-10-21 10:24:20 -0700 | [diff] [blame] | 1162 | if (IS_ERR(alias)) |
| 1163 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | dentry = alias; |
| 1165 | } |
David Howells | 54ceac4 | 2006-08-22 20:06:13 -0400 | [diff] [blame] | 1166 | |
Trond Myklebust | c79ba78 | 2007-01-31 08:16:24 -0500 | [diff] [blame] | 1167 | out_renew: |
Chuck Lever | 8fb559f | 2007-09-24 15:40:16 -0400 | [diff] [blame] | 1168 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
Trond Myklebust | c79ba78 | 2007-01-31 08:16:24 -0500 | [diff] [blame] | 1169 | return dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | } |
| 1171 | |
| 1172 | /* |
| 1173 | * Code common to create, mkdir, and mknod. |
| 1174 | */ |
| 1175 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, |
| 1176 | struct nfs_fattr *fattr) |
| 1177 | { |
| 1178 | struct inode *inode; |
| 1179 | int error = -EACCES; |
| 1180 | |
| 1181 | /* We may have been initialized further down */ |
| 1182 | if (dentry->d_inode) |
| 1183 | return 0; |
| 1184 | if (fhandle->size == 0) { |
| 1185 | struct inode *dir = dentry->d_parent->d_inode; |
| 1186 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
| 1187 | if (error) |
Chuck Lever | 4f390c1 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 1188 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1189 | } |
| 1190 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
| 1191 | struct nfs_server *server = NFS_SB(dentry->d_sb); |
David Howells | 8fa5c00 | 2006-08-22 20:06:12 -0400 | [diff] [blame] | 1192 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | if (error < 0) |
Chuck Lever | 4f390c1 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 1194 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1195 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1196 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
Trond Myklebust | 03f28e3 | 2006-03-20 13:44:48 -0500 | [diff] [blame] | 1197 | error = PTR_ERR(inode); |
| 1198 | if (IS_ERR(inode)) |
Chuck Lever | 4f390c1 | 2006-08-22 20:06:22 -0400 | [diff] [blame] | 1199 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1200 | d_instantiate(dentry, inode); |
Trond Myklebust | fd68407 | 2006-09-05 12:27:44 -0400 | [diff] [blame] | 1201 | if (d_unhashed(dentry)) |
| 1202 | d_rehash(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1203 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1204 | } |
| 1205 | |
| 1206 | /* |
| 1207 | * Following a failed create operation, we drop the dentry rather |
| 1208 | * than retain a negative dentry. This avoids a problem in the event |
| 1209 | * that the operation succeeded on the server, but an error in the |
| 1210 | * reply path made it appear to have failed. |
| 1211 | */ |
| 1212 | static int nfs_create(struct inode *dir, struct dentry *dentry, int mode, |
| 1213 | struct nameidata *nd) |
| 1214 | { |
| 1215 | struct iattr attr; |
| 1216 | int error; |
| 1217 | int open_flags = 0; |
| 1218 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1219 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
| 1220 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1221 | |
| 1222 | attr.ia_mode = mode; |
| 1223 | attr.ia_valid = ATTR_MODE; |
| 1224 | |
Trond Myklebust | ad389da | 2007-06-05 12:30:00 -0400 | [diff] [blame] | 1225 | if ((nd->flags & LOOKUP_CREATE) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1226 | open_flags = nd->intent.open.flags; |
| 1227 | |
| 1228 | lock_kernel(); |
| 1229 | nfs_begin_data_update(dir); |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 1230 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, nd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1231 | nfs_end_data_update(dir); |
| 1232 | if (error != 0) |
| 1233 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 1235 | unlock_kernel(); |
| 1236 | return 0; |
| 1237 | out_err: |
| 1238 | unlock_kernel(); |
| 1239 | d_drop(dentry); |
| 1240 | return error; |
| 1241 | } |
| 1242 | |
| 1243 | /* |
| 1244 | * See comments for nfs_proc_create regarding failed operations. |
| 1245 | */ |
| 1246 | static int |
| 1247 | nfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) |
| 1248 | { |
| 1249 | struct iattr attr; |
| 1250 | int status; |
| 1251 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1252 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
| 1253 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1254 | |
| 1255 | if (!new_valid_dev(rdev)) |
| 1256 | return -EINVAL; |
| 1257 | |
| 1258 | attr.ia_mode = mode; |
| 1259 | attr.ia_valid = ATTR_MODE; |
| 1260 | |
| 1261 | lock_kernel(); |
| 1262 | nfs_begin_data_update(dir); |
| 1263 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
| 1264 | nfs_end_data_update(dir); |
| 1265 | if (status != 0) |
| 1266 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1267 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 1268 | unlock_kernel(); |
| 1269 | return 0; |
| 1270 | out_err: |
| 1271 | unlock_kernel(); |
| 1272 | d_drop(dentry); |
| 1273 | return status; |
| 1274 | } |
| 1275 | |
| 1276 | /* |
| 1277 | * See comments for nfs_proc_create regarding failed operations. |
| 1278 | */ |
| 1279 | static int nfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 1280 | { |
| 1281 | struct iattr attr; |
| 1282 | int error; |
| 1283 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1284 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
| 1285 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | |
| 1287 | attr.ia_valid = ATTR_MODE; |
| 1288 | attr.ia_mode = mode | S_IFDIR; |
| 1289 | |
| 1290 | lock_kernel(); |
| 1291 | nfs_begin_data_update(dir); |
| 1292 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
| 1293 | nfs_end_data_update(dir); |
| 1294 | if (error != 0) |
| 1295 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 1297 | unlock_kernel(); |
| 1298 | return 0; |
| 1299 | out_err: |
| 1300 | d_drop(dentry); |
| 1301 | unlock_kernel(); |
| 1302 | return error; |
| 1303 | } |
| 1304 | |
| 1305 | static int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
| 1306 | { |
| 1307 | int error; |
| 1308 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1309 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
| 1310 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1311 | |
| 1312 | lock_kernel(); |
| 1313 | nfs_begin_data_update(dir); |
| 1314 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
| 1315 | /* Ensure the VFS deletes this inode */ |
| 1316 | if (error == 0 && dentry->d_inode != NULL) |
Dave Hansen | ce71ec3 | 2006-09-30 23:29:06 -0700 | [diff] [blame] | 1317 | clear_nlink(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | nfs_end_data_update(dir); |
| 1319 | unlock_kernel(); |
| 1320 | |
| 1321 | return error; |
| 1322 | } |
| 1323 | |
| 1324 | static int nfs_sillyrename(struct inode *dir, struct dentry *dentry) |
| 1325 | { |
| 1326 | static unsigned int sillycounter; |
Peter Staubach | 4e769b9 | 2007-08-03 15:07:10 -0400 | [diff] [blame] | 1327 | const int fileidsize = sizeof(NFS_FILEID(dentry->d_inode))*2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1328 | const int countersize = sizeof(sillycounter)*2; |
Peter Staubach | 4e769b9 | 2007-08-03 15:07:10 -0400 | [diff] [blame] | 1329 | const int slen = sizeof(".nfs")+fileidsize+countersize-1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | char silly[slen+1]; |
| 1331 | struct qstr qsilly; |
| 1332 | struct dentry *sdentry; |
| 1333 | int error = -EIO; |
| 1334 | |
| 1335 | dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n", |
| 1336 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 1337 | atomic_read(&dentry->d_count)); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1338 | nfs_inc_stats(dir, NFSIOS_SILLYRENAME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1339 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | /* |
| 1341 | * We don't allow a dentry to be silly-renamed twice. |
| 1342 | */ |
| 1343 | error = -EBUSY; |
| 1344 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) |
| 1345 | goto out; |
| 1346 | |
Peter Staubach | 4e769b9 | 2007-08-03 15:07:10 -0400 | [diff] [blame] | 1347 | sprintf(silly, ".nfs%*.*Lx", |
| 1348 | fileidsize, fileidsize, |
| 1349 | (unsigned long long)NFS_FILEID(dentry->d_inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1350 | |
Trond Myklebust | 34ea818 | 2005-11-04 15:35:02 -0500 | [diff] [blame] | 1351 | /* Return delegation in anticipation of the rename */ |
| 1352 | nfs_inode_return_delegation(dentry->d_inode); |
| 1353 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | sdentry = NULL; |
| 1355 | do { |
| 1356 | char *suffix = silly + slen - countersize; |
| 1357 | |
| 1358 | dput(sdentry); |
| 1359 | sillycounter++; |
| 1360 | sprintf(suffix, "%*.*x", countersize, countersize, sillycounter); |
| 1361 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1362 | dfprintk(VFS, "NFS: trying to rename %s to %s\n", |
| 1363 | dentry->d_name.name, silly); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1364 | |
| 1365 | sdentry = lookup_one_len(silly, dentry->d_parent, slen); |
| 1366 | /* |
| 1367 | * N.B. Better to return EBUSY here ... it could be |
| 1368 | * dangerous to delete the file while it's in use. |
| 1369 | */ |
| 1370 | if (IS_ERR(sdentry)) |
| 1371 | goto out; |
| 1372 | } while(sdentry->d_inode != NULL); /* need negative lookup */ |
| 1373 | |
| 1374 | qsilly.name = silly; |
| 1375 | qsilly.len = strlen(silly); |
| 1376 | nfs_begin_data_update(dir); |
| 1377 | if (dentry->d_inode) { |
| 1378 | nfs_begin_data_update(dentry->d_inode); |
| 1379 | error = NFS_PROTO(dir)->rename(dir, &dentry->d_name, |
| 1380 | dir, &qsilly); |
Trond Myklebust | 5ba7cc4 | 2005-12-03 15:20:17 -0500 | [diff] [blame] | 1381 | nfs_mark_for_revalidate(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1382 | nfs_end_data_update(dentry->d_inode); |
| 1383 | } else |
| 1384 | error = NFS_PROTO(dir)->rename(dir, &dentry->d_name, |
| 1385 | dir, &qsilly); |
| 1386 | nfs_end_data_update(dir); |
| 1387 | if (!error) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1388 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 1389 | d_move(dentry, sdentry); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 1390 | error = nfs_async_unlink(dir, dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1391 | /* If we return 0 we don't unlink */ |
| 1392 | } |
| 1393 | dput(sdentry); |
| 1394 | out: |
| 1395 | return error; |
| 1396 | } |
| 1397 | |
| 1398 | /* |
| 1399 | * Remove a file after making sure there are no pending writes, |
| 1400 | * and after checking that the file has only one user. |
| 1401 | * |
| 1402 | * We invalidate the attribute cache and free the inode prior to the operation |
| 1403 | * to avoid possible races if the server reuses the inode. |
| 1404 | */ |
| 1405 | static int nfs_safe_remove(struct dentry *dentry) |
| 1406 | { |
| 1407 | struct inode *dir = dentry->d_parent->d_inode; |
| 1408 | struct inode *inode = dentry->d_inode; |
| 1409 | int error = -EBUSY; |
| 1410 | |
| 1411 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", |
| 1412 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 1413 | |
| 1414 | /* If the dentry was sillyrenamed, we simply call d_delete() */ |
| 1415 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
| 1416 | error = 0; |
| 1417 | goto out; |
| 1418 | } |
| 1419 | |
| 1420 | nfs_begin_data_update(dir); |
| 1421 | if (inode != NULL) { |
Trond Myklebust | cae7a07 | 2005-10-18 14:20:19 -0700 | [diff] [blame] | 1422 | nfs_inode_return_delegation(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1423 | nfs_begin_data_update(inode); |
| 1424 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
| 1425 | /* The VFS may want to delete this inode */ |
| 1426 | if (error == 0) |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 1427 | drop_nlink(inode); |
Trond Myklebust | 5ba7cc4 | 2005-12-03 15:20:17 -0500 | [diff] [blame] | 1428 | nfs_mark_for_revalidate(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1429 | nfs_end_data_update(inode); |
| 1430 | } else |
| 1431 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
| 1432 | nfs_end_data_update(dir); |
| 1433 | out: |
| 1434 | return error; |
| 1435 | } |
| 1436 | |
| 1437 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode |
| 1438 | * belongs to an active ".nfs..." file and we return -EBUSY. |
| 1439 | * |
| 1440 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. |
| 1441 | */ |
| 1442 | static int nfs_unlink(struct inode *dir, struct dentry *dentry) |
| 1443 | { |
| 1444 | int error; |
| 1445 | int need_rehash = 0; |
| 1446 | |
| 1447 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, |
| 1448 | dir->i_ino, dentry->d_name.name); |
| 1449 | |
| 1450 | lock_kernel(); |
| 1451 | spin_lock(&dcache_lock); |
| 1452 | spin_lock(&dentry->d_lock); |
| 1453 | if (atomic_read(&dentry->d_count) > 1) { |
| 1454 | spin_unlock(&dentry->d_lock); |
| 1455 | spin_unlock(&dcache_lock); |
Trond Myklebust | ccfeb50 | 2007-01-13 02:28:12 -0500 | [diff] [blame] | 1456 | /* Start asynchronous writeout of the inode */ |
| 1457 | write_inode_now(dentry->d_inode, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1458 | error = nfs_sillyrename(dir, dentry); |
| 1459 | unlock_kernel(); |
| 1460 | return error; |
| 1461 | } |
| 1462 | if (!d_unhashed(dentry)) { |
| 1463 | __d_drop(dentry); |
| 1464 | need_rehash = 1; |
| 1465 | } |
| 1466 | spin_unlock(&dentry->d_lock); |
| 1467 | spin_unlock(&dcache_lock); |
| 1468 | error = nfs_safe_remove(dentry); |
| 1469 | if (!error) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1470 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 1471 | } else if (need_rehash) |
| 1472 | d_rehash(dentry); |
| 1473 | unlock_kernel(); |
| 1474 | return error; |
| 1475 | } |
| 1476 | |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1477 | /* |
| 1478 | * To create a symbolic link, most file systems instantiate a new inode, |
| 1479 | * add a page to it containing the path, then write it out to the disk |
| 1480 | * using prepare_write/commit_write. |
| 1481 | * |
| 1482 | * Unfortunately the NFS client can't create the in-core inode first |
| 1483 | * because it needs a file handle to create an in-core inode (see |
| 1484 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the |
| 1485 | * symlink request has completed on the server. |
| 1486 | * |
| 1487 | * So instead we allocate a raw page, copy the symname into it, then do |
| 1488 | * the SYMLINK request with the page as the buffer. If it succeeds, we |
| 1489 | * now have a new file handle and can instantiate an in-core NFS inode |
| 1490 | * and move the raw page into its mapping. |
| 1491 | */ |
| 1492 | static int nfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | { |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1494 | struct pagevec lru_pvec; |
| 1495 | struct page *page; |
| 1496 | char *kaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1497 | struct iattr attr; |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1498 | unsigned int pathlen = strlen(symname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1499 | int error; |
| 1500 | |
| 1501 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, |
| 1502 | dir->i_ino, dentry->d_name.name, symname); |
| 1503 | |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1504 | if (pathlen > PAGE_SIZE) |
| 1505 | return -ENAMETOOLONG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1506 | |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1507 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
| 1508 | attr.ia_valid = ATTR_MODE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1509 | |
| 1510 | lock_kernel(); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1511 | |
Jeff Layton | 83d93f2 | 2007-06-07 09:58:08 -0400 | [diff] [blame] | 1512 | page = alloc_page(GFP_HIGHUSER); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1513 | if (!page) { |
| 1514 | unlock_kernel(); |
| 1515 | return -ENOMEM; |
| 1516 | } |
| 1517 | |
| 1518 | kaddr = kmap_atomic(page, KM_USER0); |
| 1519 | memcpy(kaddr, symname, pathlen); |
| 1520 | if (pathlen < PAGE_SIZE) |
| 1521 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); |
| 1522 | kunmap_atomic(kaddr, KM_USER0); |
| 1523 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1524 | nfs_begin_data_update(dir); |
Chuck Lever | 94a6d75 | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1525 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | nfs_end_data_update(dir); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1527 | if (error != 0) { |
| 1528 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", |
| 1529 | dir->i_sb->s_id, dir->i_ino, |
| 1530 | dentry->d_name.name, symname, error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1531 | d_drop(dentry); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1532 | __free_page(page); |
| 1533 | unlock_kernel(); |
| 1534 | return error; |
| 1535 | } |
| 1536 | |
| 1537 | /* |
| 1538 | * No big deal if we can't add this page to the page cache here. |
| 1539 | * READLINK will get the missing page from the server if needed. |
| 1540 | */ |
| 1541 | pagevec_init(&lru_pvec, 0); |
| 1542 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, |
| 1543 | GFP_KERNEL)) { |
Chuck Lever | 39cf8a1 | 2006-10-19 23:28:41 -0700 | [diff] [blame] | 1544 | pagevec_add(&lru_pvec, page); |
| 1545 | pagevec_lru_add(&lru_pvec); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1546 | SetPageUptodate(page); |
| 1547 | unlock_page(page); |
| 1548 | } else |
| 1549 | __free_page(page); |
| 1550 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1551 | unlock_kernel(); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1552 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1553 | } |
| 1554 | |
| 1555 | static int |
| 1556 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
| 1557 | { |
| 1558 | struct inode *inode = old_dentry->d_inode; |
| 1559 | int error; |
| 1560 | |
| 1561 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", |
| 1562 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, |
| 1563 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 1564 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1565 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1566 | nfs_begin_data_update(dir); |
| 1567 | nfs_begin_data_update(inode); |
| 1568 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
Trond Myklebust | cf80955 | 2005-10-27 22:12:42 -0400 | [diff] [blame] | 1569 | if (error == 0) { |
| 1570 | atomic_inc(&inode->i_count); |
| 1571 | d_instantiate(dentry, inode); |
| 1572 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1573 | nfs_end_data_update(inode); |
| 1574 | nfs_end_data_update(dir); |
| 1575 | unlock_kernel(); |
| 1576 | return error; |
| 1577 | } |
| 1578 | |
| 1579 | /* |
| 1580 | * RENAME |
| 1581 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a |
| 1582 | * different file handle for the same inode after a rename (e.g. when |
| 1583 | * moving to a different directory). A fail-safe method to do so would |
| 1584 | * be to look up old_dir/old_name, create a link to new_dir/new_name and |
| 1585 | * rename the old file using the sillyrename stuff. This way, the original |
| 1586 | * file in old_dir will go away when the last process iput()s the inode. |
| 1587 | * |
| 1588 | * FIXED. |
| 1589 | * |
| 1590 | * It actually works quite well. One needs to have the possibility for |
| 1591 | * at least one ".nfs..." file in each directory the file ever gets |
| 1592 | * moved or linked to which happens automagically with the new |
| 1593 | * implementation that only depends on the dcache stuff instead of |
| 1594 | * using the inode layer |
| 1595 | * |
| 1596 | * Unfortunately, things are a little more complicated than indicated |
| 1597 | * above. For a cross-directory move, we want to make sure we can get |
| 1598 | * rid of the old inode after the operation. This means there must be |
| 1599 | * no pending writes (if it's a file), and the use count must be 1. |
| 1600 | * If these conditions are met, we can drop the dentries before doing |
| 1601 | * the rename. |
| 1602 | */ |
| 1603 | static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 1604 | struct inode *new_dir, struct dentry *new_dentry) |
| 1605 | { |
| 1606 | struct inode *old_inode = old_dentry->d_inode; |
| 1607 | struct inode *new_inode = new_dentry->d_inode; |
| 1608 | struct dentry *dentry = NULL, *rehash = NULL; |
| 1609 | int error = -EBUSY; |
| 1610 | |
| 1611 | /* |
| 1612 | * To prevent any new references to the target during the rename, |
| 1613 | * we unhash the dentry and free the inode in advance. |
| 1614 | */ |
| 1615 | lock_kernel(); |
| 1616 | if (!d_unhashed(new_dentry)) { |
| 1617 | d_drop(new_dentry); |
| 1618 | rehash = new_dentry; |
| 1619 | } |
| 1620 | |
| 1621 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
| 1622 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, |
| 1623 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, |
| 1624 | atomic_read(&new_dentry->d_count)); |
| 1625 | |
| 1626 | /* |
| 1627 | * First check whether the target is busy ... we can't |
| 1628 | * safely do _any_ rename if the target is in use. |
| 1629 | * |
| 1630 | * For files, make a copy of the dentry and then do a |
| 1631 | * silly-rename. If the silly-rename succeeds, the |
| 1632 | * copied dentry is hashed and becomes the new target. |
| 1633 | */ |
| 1634 | if (!new_inode) |
| 1635 | goto go_ahead; |
Trond Myklebust | 6fe43f9 | 2005-10-18 14:20:22 -0700 | [diff] [blame] | 1636 | if (S_ISDIR(new_inode->i_mode)) { |
| 1637 | error = -EISDIR; |
| 1638 | if (!S_ISDIR(old_inode->i_mode)) |
| 1639 | goto out; |
| 1640 | } else if (atomic_read(&new_dentry->d_count) > 2) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1641 | int err; |
| 1642 | /* copy the target dentry's name */ |
| 1643 | dentry = d_alloc(new_dentry->d_parent, |
| 1644 | &new_dentry->d_name); |
| 1645 | if (!dentry) |
| 1646 | goto out; |
| 1647 | |
| 1648 | /* silly-rename the existing target ... */ |
| 1649 | err = nfs_sillyrename(new_dir, new_dentry); |
| 1650 | if (!err) { |
| 1651 | new_dentry = rehash = dentry; |
| 1652 | new_inode = NULL; |
| 1653 | /* instantiate the replacement target */ |
| 1654 | d_instantiate(new_dentry, NULL); |
Jesper Juhl | 7a13e93 | 2007-04-26 00:29:02 -0700 | [diff] [blame] | 1655 | } else if (atomic_read(&new_dentry->d_count) > 1) |
| 1656 | /* dentry still busy? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1657 | goto out; |
Trond Myklebust | 20509f1 | 2005-08-25 16:25:34 -0700 | [diff] [blame] | 1658 | } else |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 1659 | drop_nlink(new_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1660 | |
| 1661 | go_ahead: |
| 1662 | /* |
| 1663 | * ... prune child dentries and writebacks if needed. |
| 1664 | */ |
| 1665 | if (atomic_read(&old_dentry->d_count) > 1) { |
Trond Myklebust | e1552e1 | 2007-04-14 19:07:28 -0400 | [diff] [blame] | 1666 | if (S_ISREG(old_inode->i_mode)) |
| 1667 | nfs_wb_all(old_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | shrink_dcache_parent(old_dentry); |
| 1669 | } |
Trond Myklebust | cae7a07 | 2005-10-18 14:20:19 -0700 | [diff] [blame] | 1670 | nfs_inode_return_delegation(old_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1671 | |
Trond Myklebust | 2417411 | 2006-01-03 09:55:33 +0100 | [diff] [blame] | 1672 | if (new_inode != NULL) { |
| 1673 | nfs_inode_return_delegation(new_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1674 | d_delete(new_dentry); |
Trond Myklebust | 2417411 | 2006-01-03 09:55:33 +0100 | [diff] [blame] | 1675 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1676 | |
| 1677 | nfs_begin_data_update(old_dir); |
| 1678 | nfs_begin_data_update(new_dir); |
| 1679 | nfs_begin_data_update(old_inode); |
| 1680 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
| 1681 | new_dir, &new_dentry->d_name); |
Trond Myklebust | 5ba7cc4 | 2005-12-03 15:20:17 -0500 | [diff] [blame] | 1682 | nfs_mark_for_revalidate(old_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1683 | nfs_end_data_update(old_inode); |
| 1684 | nfs_end_data_update(new_dir); |
| 1685 | nfs_end_data_update(old_dir); |
| 1686 | out: |
| 1687 | if (rehash) |
| 1688 | d_rehash(rehash); |
| 1689 | if (!error) { |
Mark Fasheh | 349457c | 2006-09-08 14:22:21 -0700 | [diff] [blame] | 1690 | d_move(old_dentry, new_dentry); |
Chuck Lever | 8fb559f | 2007-09-24 15:40:16 -0400 | [diff] [blame] | 1691 | nfs_set_verifier(new_dentry, |
| 1692 | nfs_save_change_attribute(new_dir)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1693 | } |
| 1694 | |
| 1695 | /* new dentry created? */ |
| 1696 | if (dentry) |
| 1697 | dput(dentry); |
| 1698 | unlock_kernel(); |
| 1699 | return error; |
| 1700 | } |
| 1701 | |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1702 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
| 1703 | static LIST_HEAD(nfs_access_lru_list); |
| 1704 | static atomic_long_t nfs_access_nr_entries; |
| 1705 | |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1706 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
| 1707 | { |
| 1708 | put_rpccred(entry->cred); |
| 1709 | kfree(entry); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1710 | smp_mb__before_atomic_dec(); |
| 1711 | atomic_long_dec(&nfs_access_nr_entries); |
| 1712 | smp_mb__after_atomic_dec(); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1713 | } |
| 1714 | |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1715 | int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask) |
| 1716 | { |
| 1717 | LIST_HEAD(head); |
| 1718 | struct nfs_inode *nfsi; |
| 1719 | struct nfs_access_entry *cache; |
| 1720 | |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1721 | restart: |
Trond Myklebust | a50f795 | 2007-06-05 19:23:43 -0400 | [diff] [blame] | 1722 | spin_lock(&nfs_access_lru_lock); |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1723 | list_for_each_entry(nfsi, &nfs_access_lru_list, access_cache_inode_lru) { |
| 1724 | struct inode *inode; |
| 1725 | |
| 1726 | if (nr_to_scan-- == 0) |
| 1727 | break; |
| 1728 | inode = igrab(&nfsi->vfs_inode); |
| 1729 | if (inode == NULL) |
| 1730 | continue; |
| 1731 | spin_lock(&inode->i_lock); |
| 1732 | if (list_empty(&nfsi->access_cache_entry_lru)) |
| 1733 | goto remove_lru_entry; |
| 1734 | cache = list_entry(nfsi->access_cache_entry_lru.next, |
| 1735 | struct nfs_access_entry, lru); |
| 1736 | list_move(&cache->lru, &head); |
| 1737 | rb_erase(&cache->rb_node, &nfsi->access_cache); |
| 1738 | if (!list_empty(&nfsi->access_cache_entry_lru)) |
| 1739 | list_move_tail(&nfsi->access_cache_inode_lru, |
| 1740 | &nfs_access_lru_list); |
| 1741 | else { |
| 1742 | remove_lru_entry: |
| 1743 | list_del_init(&nfsi->access_cache_inode_lru); |
| 1744 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
| 1745 | } |
| 1746 | spin_unlock(&inode->i_lock); |
Trond Myklebust | a50f795 | 2007-06-05 19:23:43 -0400 | [diff] [blame] | 1747 | spin_unlock(&nfs_access_lru_lock); |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1748 | iput(inode); |
| 1749 | goto restart; |
| 1750 | } |
| 1751 | spin_unlock(&nfs_access_lru_lock); |
| 1752 | while (!list_empty(&head)) { |
| 1753 | cache = list_entry(head.next, struct nfs_access_entry, lru); |
| 1754 | list_del(&cache->lru); |
| 1755 | nfs_access_free_entry(cache); |
| 1756 | } |
| 1757 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
| 1758 | } |
| 1759 | |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1760 | static void __nfs_access_zap_cache(struct inode *inode) |
| 1761 | { |
| 1762 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1763 | struct rb_root *root_node = &nfsi->access_cache; |
| 1764 | struct rb_node *n, *dispose = NULL; |
| 1765 | struct nfs_access_entry *entry; |
| 1766 | |
| 1767 | /* Unhook entries from the cache */ |
| 1768 | while ((n = rb_first(root_node)) != NULL) { |
| 1769 | entry = rb_entry(n, struct nfs_access_entry, rb_node); |
| 1770 | rb_erase(n, root_node); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1771 | list_del(&entry->lru); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1772 | n->rb_left = dispose; |
| 1773 | dispose = n; |
| 1774 | } |
| 1775 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; |
| 1776 | spin_unlock(&inode->i_lock); |
| 1777 | |
| 1778 | /* Now kill them all! */ |
| 1779 | while (dispose != NULL) { |
| 1780 | n = dispose; |
| 1781 | dispose = n->rb_left; |
| 1782 | nfs_access_free_entry(rb_entry(n, struct nfs_access_entry, rb_node)); |
| 1783 | } |
| 1784 | } |
| 1785 | |
| 1786 | void nfs_access_zap_cache(struct inode *inode) |
| 1787 | { |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1788 | /* Remove from global LRU init */ |
| 1789 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_FLAGS(inode))) { |
| 1790 | spin_lock(&nfs_access_lru_lock); |
| 1791 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
| 1792 | spin_unlock(&nfs_access_lru_lock); |
| 1793 | } |
| 1794 | |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1795 | spin_lock(&inode->i_lock); |
| 1796 | /* This will release the spinlock */ |
| 1797 | __nfs_access_zap_cache(inode); |
| 1798 | } |
| 1799 | |
| 1800 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
| 1801 | { |
| 1802 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; |
| 1803 | struct nfs_access_entry *entry; |
| 1804 | |
| 1805 | while (n != NULL) { |
| 1806 | entry = rb_entry(n, struct nfs_access_entry, rb_node); |
| 1807 | |
| 1808 | if (cred < entry->cred) |
| 1809 | n = n->rb_left; |
| 1810 | else if (cred > entry->cred) |
| 1811 | n = n->rb_right; |
| 1812 | else |
| 1813 | return entry; |
| 1814 | } |
| 1815 | return NULL; |
| 1816 | } |
| 1817 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1818 | int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
| 1819 | { |
Chuck Lever | 5529680 | 2005-08-18 11:24:09 -0700 | [diff] [blame] | 1820 | struct nfs_inode *nfsi = NFS_I(inode); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1821 | struct nfs_access_entry *cache; |
| 1822 | int err = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1823 | |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1824 | spin_lock(&inode->i_lock); |
| 1825 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
| 1826 | goto out_zap; |
| 1827 | cache = nfs_access_search_rbtree(inode, cred); |
| 1828 | if (cache == NULL) |
| 1829 | goto out; |
Fabio Olive Leite | c7e1596 | 2007-07-26 22:59:00 -0300 | [diff] [blame] | 1830 | if (!time_in_range(jiffies, cache->jiffies, cache->jiffies + NFS_ATTRTIMEO(inode))) |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1831 | goto out_stale; |
| 1832 | res->jiffies = cache->jiffies; |
| 1833 | res->cred = cache->cred; |
| 1834 | res->mask = cache->mask; |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1835 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1836 | err = 0; |
| 1837 | out: |
| 1838 | spin_unlock(&inode->i_lock); |
| 1839 | return err; |
| 1840 | out_stale: |
| 1841 | rb_erase(&cache->rb_node, &nfsi->access_cache); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1842 | list_del(&cache->lru); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1843 | spin_unlock(&inode->i_lock); |
| 1844 | nfs_access_free_entry(cache); |
| 1845 | return -ENOENT; |
| 1846 | out_zap: |
| 1847 | /* This will release the spinlock */ |
| 1848 | __nfs_access_zap_cache(inode); |
| 1849 | return -ENOENT; |
| 1850 | } |
| 1851 | |
| 1852 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) |
| 1853 | { |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1854 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1855 | struct rb_root *root_node = &nfsi->access_cache; |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1856 | struct rb_node **p = &root_node->rb_node; |
| 1857 | struct rb_node *parent = NULL; |
| 1858 | struct nfs_access_entry *entry; |
| 1859 | |
| 1860 | spin_lock(&inode->i_lock); |
| 1861 | while (*p != NULL) { |
| 1862 | parent = *p; |
| 1863 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); |
| 1864 | |
| 1865 | if (set->cred < entry->cred) |
| 1866 | p = &parent->rb_left; |
| 1867 | else if (set->cred > entry->cred) |
| 1868 | p = &parent->rb_right; |
| 1869 | else |
| 1870 | goto found; |
| 1871 | } |
| 1872 | rb_link_node(&set->rb_node, parent, p); |
| 1873 | rb_insert_color(&set->rb_node, root_node); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1874 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1875 | spin_unlock(&inode->i_lock); |
| 1876 | return; |
| 1877 | found: |
| 1878 | rb_replace_node(parent, &set->rb_node, root_node); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1879 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
| 1880 | list_del(&entry->lru); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1881 | spin_unlock(&inode->i_lock); |
| 1882 | nfs_access_free_entry(entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1883 | } |
| 1884 | |
| 1885 | void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
| 1886 | { |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1887 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); |
| 1888 | if (cache == NULL) |
| 1889 | return; |
| 1890 | RB_CLEAR_NODE(&cache->rb_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1891 | cache->jiffies = set->jiffies; |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1892 | cache->cred = get_rpccred(set->cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1893 | cache->mask = set->mask; |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1894 | |
| 1895 | nfs_access_add_rbtree(inode, cache); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1896 | |
| 1897 | /* Update accounting */ |
| 1898 | smp_mb__before_atomic_inc(); |
| 1899 | atomic_long_inc(&nfs_access_nr_entries); |
| 1900 | smp_mb__after_atomic_inc(); |
| 1901 | |
| 1902 | /* Add inode to global LRU list */ |
| 1903 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_FLAGS(inode))) { |
| 1904 | spin_lock(&nfs_access_lru_lock); |
| 1905 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, &nfs_access_lru_list); |
| 1906 | spin_unlock(&nfs_access_lru_lock); |
| 1907 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1908 | } |
| 1909 | |
| 1910 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) |
| 1911 | { |
| 1912 | struct nfs_access_entry cache; |
| 1913 | int status; |
| 1914 | |
| 1915 | status = nfs_access_get_cached(inode, cred, &cache); |
| 1916 | if (status == 0) |
| 1917 | goto out; |
| 1918 | |
| 1919 | /* Be clever: ask server to check for all possible rights */ |
| 1920 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; |
| 1921 | cache.cred = cred; |
| 1922 | cache.jiffies = jiffies; |
| 1923 | status = NFS_PROTO(inode)->access(inode, &cache); |
| 1924 | if (status != 0) |
| 1925 | return status; |
| 1926 | nfs_access_add_cache(inode, &cache); |
| 1927 | out: |
| 1928 | if ((cache.mask & mask) == mask) |
| 1929 | return 0; |
| 1930 | return -EACCES; |
| 1931 | } |
| 1932 | |
| 1933 | int nfs_permission(struct inode *inode, int mask, struct nameidata *nd) |
| 1934 | { |
| 1935 | struct rpc_cred *cred; |
| 1936 | int res = 0; |
| 1937 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1938 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
| 1939 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1940 | if (mask == 0) |
| 1941 | goto out; |
| 1942 | /* Is this sys_access() ? */ |
| 1943 | if (nd != NULL && (nd->flags & LOOKUP_ACCESS)) |
| 1944 | goto force_lookup; |
| 1945 | |
| 1946 | switch (inode->i_mode & S_IFMT) { |
| 1947 | case S_IFLNK: |
| 1948 | goto out; |
| 1949 | case S_IFREG: |
| 1950 | /* NFSv4 has atomic_open... */ |
| 1951 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) |
| 1952 | && nd != NULL |
| 1953 | && (nd->flags & LOOKUP_OPEN)) |
| 1954 | goto out; |
| 1955 | break; |
| 1956 | case S_IFDIR: |
| 1957 | /* |
| 1958 | * Optimize away all write operations, since the server |
| 1959 | * will check permissions when we perform the op. |
| 1960 | */ |
| 1961 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) |
| 1962 | goto out; |
| 1963 | } |
| 1964 | |
| 1965 | force_lookup: |
| 1966 | lock_kernel(); |
| 1967 | |
| 1968 | if (!NFS_PROTO(inode)->access) |
| 1969 | goto out_notsup; |
| 1970 | |
| 1971 | cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0); |
| 1972 | if (!IS_ERR(cred)) { |
| 1973 | res = nfs_do_access(inode, cred, mask); |
| 1974 | put_rpccred(cred); |
| 1975 | } else |
| 1976 | res = PTR_ERR(cred); |
| 1977 | unlock_kernel(); |
| 1978 | out: |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1979 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
| 1980 | inode->i_sb->s_id, inode->i_ino, mask, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1981 | return res; |
| 1982 | out_notsup: |
| 1983 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| 1984 | if (res == 0) |
| 1985 | res = generic_permission(inode, mask, NULL); |
| 1986 | unlock_kernel(); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1987 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1988 | } |
| 1989 | |
| 1990 | /* |
| 1991 | * Local variables: |
| 1992 | * version-control: t |
| 1993 | * kept-new-versions: 5 |
| 1994 | * End: |
| 1995 | */ |