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" |
Adrian Bunk | 4c30d56 | 2007-11-21 15:04:31 -0800 | [diff] [blame] | 41 | #include "internal.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 43 | /* #define NFS_DEBUG_VERBOSE 1 */ |
| 44 | |
| 45 | static int nfs_opendir(struct inode *, struct file *); |
| 46 | static int nfs_readdir(struct file *, void *, filldir_t); |
| 47 | static struct dentry *nfs_lookup(struct inode *, struct dentry *, struct nameidata *); |
| 48 | static int nfs_create(struct inode *, struct dentry *, int, struct nameidata *); |
| 49 | static int nfs_mkdir(struct inode *, struct dentry *, int); |
| 50 | static int nfs_rmdir(struct inode *, struct dentry *); |
| 51 | static int nfs_unlink(struct inode *, struct dentry *); |
| 52 | static int nfs_symlink(struct inode *, struct dentry *, const char *); |
| 53 | static int nfs_link(struct dentry *, struct inode *, struct dentry *); |
| 54 | static int nfs_mknod(struct inode *, struct dentry *, int, dev_t); |
| 55 | static int nfs_rename(struct inode *, struct dentry *, |
| 56 | struct inode *, struct dentry *); |
| 57 | static int nfs_fsync_dir(struct file *, struct dentry *, int); |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 58 | static loff_t nfs_llseek_dir(struct file *, loff_t, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 60 | const struct file_operations nfs_dir_operations = { |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 61 | .llseek = nfs_llseek_dir, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 62 | .read = generic_read_dir, |
| 63 | .readdir = nfs_readdir, |
| 64 | .open = nfs_opendir, |
| 65 | .release = nfs_release, |
| 66 | .fsync = nfs_fsync_dir, |
| 67 | }; |
| 68 | |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 69 | const struct inode_operations nfs_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | .create = nfs_create, |
| 71 | .lookup = nfs_lookup, |
| 72 | .link = nfs_link, |
| 73 | .unlink = nfs_unlink, |
| 74 | .symlink = nfs_symlink, |
| 75 | .mkdir = nfs_mkdir, |
| 76 | .rmdir = nfs_rmdir, |
| 77 | .mknod = nfs_mknod, |
| 78 | .rename = nfs_rename, |
| 79 | .permission = nfs_permission, |
| 80 | .getattr = nfs_getattr, |
| 81 | .setattr = nfs_setattr, |
| 82 | }; |
| 83 | |
Andreas Gruenbacher | b7fa055 | 2005-06-22 17:16:27 +0000 | [diff] [blame] | 84 | #ifdef CONFIG_NFS_V3 |
Arjan van de Ven | 92e1d5b | 2007-02-12 00:55:39 -0800 | [diff] [blame] | 85 | const struct inode_operations nfs3_dir_inode_operations = { |
Andreas Gruenbacher | b7fa055 | 2005-06-22 17:16:27 +0000 | [diff] [blame] | 86 | .create = nfs_create, |
| 87 | .lookup = nfs_lookup, |
| 88 | .link = nfs_link, |
| 89 | .unlink = nfs_unlink, |
| 90 | .symlink = nfs_symlink, |
| 91 | .mkdir = nfs_mkdir, |
| 92 | .rmdir = nfs_rmdir, |
| 93 | .mknod = nfs_mknod, |
| 94 | .rename = nfs_rename, |
| 95 | .permission = nfs_permission, |
| 96 | .getattr = nfs_getattr, |
| 97 | .setattr = nfs_setattr, |
| 98 | .listxattr = nfs3_listxattr, |
| 99 | .getxattr = nfs3_getxattr, |
| 100 | .setxattr = nfs3_setxattr, |
| 101 | .removexattr = nfs3_removexattr, |
| 102 | }; |
| 103 | #endif /* CONFIG_NFS_V3 */ |
| 104 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 105 | #ifdef CONFIG_NFS_V4 |
| 106 | |
| 107 | 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] | 108 | const struct inode_operations nfs4_dir_inode_operations = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | .create = nfs_create, |
| 110 | .lookup = nfs_atomic_lookup, |
| 111 | .link = nfs_link, |
| 112 | .unlink = nfs_unlink, |
| 113 | .symlink = nfs_symlink, |
| 114 | .mkdir = nfs_mkdir, |
| 115 | .rmdir = nfs_rmdir, |
| 116 | .mknod = nfs_mknod, |
| 117 | .rename = nfs_rename, |
| 118 | .permission = nfs_permission, |
| 119 | .getattr = nfs_getattr, |
| 120 | .setattr = nfs_setattr, |
J. Bruce Fields | 6b3b549 | 2005-06-22 17:16:22 +0000 | [diff] [blame] | 121 | .getxattr = nfs4_getxattr, |
| 122 | .setxattr = nfs4_setxattr, |
| 123 | .listxattr = nfs4_listxattr, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | }; |
| 125 | |
| 126 | #endif /* CONFIG_NFS_V4 */ |
| 127 | |
| 128 | /* |
| 129 | * Open file |
| 130 | */ |
| 131 | static int |
| 132 | nfs_opendir(struct inode *inode, struct file *filp) |
| 133 | { |
Carsten Otte | 7451c4f | 2006-04-19 13:06:37 -0400 | [diff] [blame] | 134 | int res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 136 | dfprintk(VFS, "NFS: opendir(%s/%ld)\n", |
| 137 | inode->i_sb->s_id, inode->i_ino); |
| 138 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | lock_kernel(); |
| 140 | /* Call generic open code in order to cache credentials */ |
Carsten Otte | 7451c4f | 2006-04-19 13:06:37 -0400 | [diff] [blame] | 141 | res = nfs_open(inode, filp); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | unlock_kernel(); |
| 143 | return res; |
| 144 | } |
| 145 | |
Al Viro | 0dbb4c6 | 2006-10-19 23:28:49 -0700 | [diff] [blame] | 146 | typedef __be32 * (*decode_dirent_t)(__be32 *, struct nfs_entry *, int); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | typedef struct { |
| 148 | struct file *file; |
| 149 | struct page *page; |
| 150 | unsigned long page_index; |
Al Viro | 0dbb4c6 | 2006-10-19 23:28:49 -0700 | [diff] [blame] | 151 | __be32 *ptr; |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 152 | u64 *dir_cookie; |
| 153 | loff_t current_index; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | struct nfs_entry *entry; |
| 155 | decode_dirent_t decode; |
| 156 | int plus; |
| 157 | int error; |
Neil Brown | 1f4eab7 | 2007-04-16 09:35:27 +1000 | [diff] [blame] | 158 | unsigned long timestamp; |
| 159 | int timestamp_valid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 160 | } nfs_readdir_descriptor_t; |
| 161 | |
| 162 | /* Now we cache directories properly, by stuffing the dirent |
| 163 | * data directly in the page cache. |
| 164 | * |
| 165 | * Inode invalidation due to refresh etc. takes care of |
| 166 | * _everything_, no sloppy entry flushing logic, no extraneous |
| 167 | * copying, network direct to page cache, the way it was meant |
| 168 | * to be. |
| 169 | * |
| 170 | * NOTE: Dirent information verification is done always by the |
| 171 | * page-in of the RPC reply, nowhere else, this simplies |
| 172 | * things substantially. |
| 173 | */ |
| 174 | static |
| 175 | int nfs_readdir_filler(nfs_readdir_descriptor_t *desc, struct page *page) |
| 176 | { |
| 177 | struct file *file = desc->file; |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 178 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | struct rpc_cred *cred = nfs_file_cred(file); |
| 180 | unsigned long timestamp; |
| 181 | int error; |
| 182 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 183 | dfprintk(DIRCACHE, "NFS: %s: reading cookie %Lu into page %lu\n", |
| 184 | __FUNCTION__, (long long)desc->entry->cookie, |
| 185 | page->index); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | |
| 187 | again: |
| 188 | timestamp = jiffies; |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 189 | 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] | 190 | NFS_SERVER(inode)->dtsize, desc->plus); |
| 191 | if (error < 0) { |
| 192 | /* We requested READDIRPLUS, but the server doesn't grok it */ |
| 193 | if (error == -ENOTSUPP && desc->plus) { |
| 194 | NFS_SERVER(inode)->caps &= ~NFS_CAP_READDIRPLUS; |
Chuck Lever | 412d582 | 2005-08-18 11:24:11 -0700 | [diff] [blame] | 195 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | desc->plus = 0; |
| 197 | goto again; |
| 198 | } |
| 199 | goto error; |
| 200 | } |
Neil Brown | 1f4eab7 | 2007-04-16 09:35:27 +1000 | [diff] [blame] | 201 | desc->timestamp = timestamp; |
| 202 | desc->timestamp_valid = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | SetPageUptodate(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | /* Ensure consistent page alignment of the data. |
| 205 | * Note: assumes we have exclusive access to this mapping either |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 206 | * through inode->i_mutex or some other mechanism. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 207 | */ |
Trond Myklebust | cd9ae2b | 2006-10-19 23:28:40 -0700 | [diff] [blame] | 208 | if (page->index == 0 && invalidate_inode_pages2_range(inode->i_mapping, PAGE_CACHE_SIZE, -1) < 0) { |
| 209 | /* Should never happen */ |
| 210 | nfs_zap_mapping(inode, inode->i_mapping); |
| 211 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | unlock_page(page); |
| 213 | return 0; |
| 214 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | unlock_page(page); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | desc->error = error; |
| 217 | return -EIO; |
| 218 | } |
| 219 | |
| 220 | static inline |
| 221 | int dir_decode(nfs_readdir_descriptor_t *desc) |
| 222 | { |
Al Viro | 0dbb4c6 | 2006-10-19 23:28:49 -0700 | [diff] [blame] | 223 | __be32 *p = desc->ptr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 224 | p = desc->decode(p, desc->entry, desc->plus); |
| 225 | if (IS_ERR(p)) |
| 226 | return PTR_ERR(p); |
| 227 | desc->ptr = p; |
Neil Brown | 1f4eab7 | 2007-04-16 09:35:27 +1000 | [diff] [blame] | 228 | if (desc->timestamp_valid) |
| 229 | desc->entry->fattr->time_start = desc->timestamp; |
| 230 | else |
| 231 | desc->entry->fattr->valid &= ~NFS_ATTR_FATTR; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 232 | return 0; |
| 233 | } |
| 234 | |
| 235 | static inline |
| 236 | void dir_page_release(nfs_readdir_descriptor_t *desc) |
| 237 | { |
| 238 | kunmap(desc->page); |
| 239 | page_cache_release(desc->page); |
| 240 | desc->page = NULL; |
| 241 | desc->ptr = NULL; |
| 242 | } |
| 243 | |
| 244 | /* |
| 245 | * 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] | 246 | * to readdir, find the next entry with cookie '*desc->dir_cookie'. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 247 | * |
| 248 | * If the end of the buffer has been reached, return -EAGAIN, if not, |
| 249 | * return the offset within the buffer of the next entry to be |
| 250 | * read. |
| 251 | */ |
| 252 | static inline |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 253 | int find_dirent(nfs_readdir_descriptor_t *desc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | { |
| 255 | struct nfs_entry *entry = desc->entry; |
| 256 | int loop_count = 0, |
| 257 | status; |
| 258 | |
| 259 | while((status = dir_decode(desc)) == 0) { |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 260 | dfprintk(DIRCACHE, "NFS: %s: examining cookie %Lu\n", |
| 261 | __FUNCTION__, (unsigned long long)entry->cookie); |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 262 | if (entry->prev_cookie == *desc->dir_cookie) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 263 | break; |
| 264 | if (loop_count++ > 200) { |
| 265 | loop_count = 0; |
| 266 | schedule(); |
| 267 | } |
| 268 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 269 | return status; |
| 270 | } |
| 271 | |
| 272 | /* |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 273 | * 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] | 274 | * to readdir, find the entry at offset 'desc->file->f_pos'. |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 275 | * |
| 276 | * If the end of the buffer has been reached, return -EAGAIN, if not, |
| 277 | * return the offset within the buffer of the next entry to be |
| 278 | * read. |
| 279 | */ |
| 280 | static inline |
| 281 | int find_dirent_index(nfs_readdir_descriptor_t *desc) |
| 282 | { |
| 283 | struct nfs_entry *entry = desc->entry; |
| 284 | int loop_count = 0, |
| 285 | status; |
| 286 | |
| 287 | for(;;) { |
| 288 | status = dir_decode(desc); |
| 289 | if (status) |
| 290 | break; |
| 291 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 292 | dfprintk(DIRCACHE, "NFS: found cookie %Lu at index %Ld\n", |
| 293 | (unsigned long long)entry->cookie, desc->current_index); |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 294 | |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 295 | if (desc->file->f_pos == desc->current_index) { |
| 296 | *desc->dir_cookie = entry->cookie; |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 297 | break; |
| 298 | } |
| 299 | desc->current_index++; |
| 300 | if (loop_count++ > 200) { |
| 301 | loop_count = 0; |
| 302 | schedule(); |
| 303 | } |
| 304 | } |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 305 | return status; |
| 306 | } |
| 307 | |
| 308 | /* |
| 309 | * Find the given page, and call find_dirent() or find_dirent_index in |
| 310 | * order to try to return the next entry. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | */ |
| 312 | static inline |
| 313 | int find_dirent_page(nfs_readdir_descriptor_t *desc) |
| 314 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 315 | struct inode *inode = desc->file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 316 | struct page *page; |
| 317 | int status; |
| 318 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 319 | dfprintk(DIRCACHE, "NFS: %s: searching page %ld for target %Lu\n", |
| 320 | __FUNCTION__, desc->page_index, |
| 321 | (long long) *desc->dir_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 322 | |
Neil Brown | 1f4eab7 | 2007-04-16 09:35:27 +1000 | [diff] [blame] | 323 | /* If we find the page in the page_cache, we cannot be sure |
| 324 | * how fresh the data is, so we will ignore readdir_plus attributes. |
| 325 | */ |
| 326 | desc->timestamp_valid = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 327 | page = read_cache_page(inode->i_mapping, desc->page_index, |
| 328 | (filler_t *)nfs_readdir_filler, desc); |
| 329 | if (IS_ERR(page)) { |
| 330 | status = PTR_ERR(page); |
| 331 | goto out; |
| 332 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 333 | |
| 334 | /* NOTE: Someone else may have changed the READDIRPLUS flag */ |
| 335 | desc->page = page; |
| 336 | desc->ptr = kmap(page); /* matching kunmap in nfs_do_filldir */ |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 337 | if (*desc->dir_cookie != 0) |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 338 | status = find_dirent(desc); |
| 339 | else |
| 340 | status = find_dirent_index(desc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | if (status < 0) |
| 342 | dir_page_release(desc); |
| 343 | out: |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 344 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __FUNCTION__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | return status; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | } |
| 347 | |
| 348 | /* |
| 349 | * Recurse through the page cache pages, and return a |
| 350 | * filled nfs_entry structure of the next directory entry if possible. |
| 351 | * |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 352 | * The target for the search is '*desc->dir_cookie' if non-0, |
| 353 | * 'desc->file->f_pos' otherwise |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 354 | */ |
| 355 | static inline |
| 356 | int readdir_search_pagecache(nfs_readdir_descriptor_t *desc) |
| 357 | { |
| 358 | int loop_count = 0; |
| 359 | int res; |
| 360 | |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 361 | /* Always search-by-index from the beginning of the cache */ |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 362 | if (*desc->dir_cookie == 0) { |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 363 | dfprintk(DIRCACHE, "NFS: readdir_search_pagecache() searching for offset %Ld\n", |
| 364 | (long long)desc->file->f_pos); |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 365 | desc->page_index = 0; |
| 366 | desc->entry->cookie = desc->entry->prev_cookie = 0; |
| 367 | desc->entry->eof = 0; |
| 368 | desc->current_index = 0; |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 369 | } else |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 370 | dfprintk(DIRCACHE, "NFS: readdir_search_pagecache() searching for cookie %Lu\n", |
| 371 | (unsigned long long)*desc->dir_cookie); |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 372 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 373 | for (;;) { |
| 374 | res = find_dirent_page(desc); |
| 375 | if (res != -EAGAIN) |
| 376 | break; |
| 377 | /* Align to beginning of next page */ |
| 378 | desc->page_index ++; |
| 379 | if (loop_count++ > 200) { |
| 380 | loop_count = 0; |
| 381 | schedule(); |
| 382 | } |
| 383 | } |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 384 | |
| 385 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", __FUNCTION__, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 386 | return res; |
| 387 | } |
| 388 | |
| 389 | static inline unsigned int dt_type(struct inode *inode) |
| 390 | { |
| 391 | return (inode->i_mode >> 12) & 15; |
| 392 | } |
| 393 | |
| 394 | static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc); |
| 395 | |
| 396 | /* |
| 397 | * Once we've found the start of the dirent within a page: fill 'er up... |
| 398 | */ |
| 399 | static |
| 400 | int nfs_do_filldir(nfs_readdir_descriptor_t *desc, void *dirent, |
| 401 | filldir_t filldir) |
| 402 | { |
| 403 | struct file *file = desc->file; |
| 404 | struct nfs_entry *entry = desc->entry; |
| 405 | struct dentry *dentry = NULL; |
Peter Staubach | 4e769b9 | 2007-08-03 15:07:10 -0400 | [diff] [blame] | 406 | u64 fileid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | int loop_count = 0, |
| 408 | res; |
| 409 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 410 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling starting @ cookie %Lu\n", |
| 411 | (unsigned long long)entry->cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | |
| 413 | for(;;) { |
| 414 | unsigned d_type = DT_UNKNOWN; |
| 415 | /* Note: entry->prev_cookie contains the cookie for |
| 416 | * retrieving the current dirent on the server */ |
Peter Staubach | 4e769b9 | 2007-08-03 15:07:10 -0400 | [diff] [blame] | 417 | fileid = entry->ino; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 418 | |
| 419 | /* Get a dentry if we have one */ |
| 420 | if (dentry != NULL) |
| 421 | dput(dentry); |
| 422 | dentry = nfs_readdir_lookup(desc); |
| 423 | |
| 424 | /* Use readdirplus info */ |
| 425 | if (dentry != NULL && dentry->d_inode != NULL) { |
| 426 | d_type = dt_type(dentry->d_inode); |
Peter Staubach | 4e769b9 | 2007-08-03 15:07:10 -0400 | [diff] [blame] | 427 | fileid = NFS_FILEID(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | } |
| 429 | |
| 430 | res = filldir(dirent, entry->name, entry->len, |
Trond Myklebust | f43bf0b | 2007-10-09 12:01:04 -0400 | [diff] [blame] | 431 | file->f_pos, nfs_compat_user_ino64(fileid), |
| 432 | d_type); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | if (res < 0) |
| 434 | break; |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 435 | file->f_pos++; |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 436 | *desc->dir_cookie = entry->cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | if (dir_decode(desc) != 0) { |
| 438 | desc->page_index ++; |
| 439 | break; |
| 440 | } |
| 441 | if (loop_count++ > 200) { |
| 442 | loop_count = 0; |
| 443 | schedule(); |
| 444 | } |
| 445 | } |
| 446 | dir_page_release(desc); |
| 447 | if (dentry != NULL) |
| 448 | dput(dentry); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 449 | dfprintk(DIRCACHE, "NFS: nfs_do_filldir() filling ended @ cookie %Lu; returning = %d\n", |
| 450 | (unsigned long long)*desc->dir_cookie, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 451 | return res; |
| 452 | } |
| 453 | |
| 454 | /* |
| 455 | * If we cannot find a cookie in our cache, we suspect that this is |
| 456 | * because it points to a deleted file, so we ask the server to return |
| 457 | * whatever it thinks is the next entry. We then feed this to filldir. |
| 458 | * If all goes well, we should then be able to find our way round the |
| 459 | * cache on the next call to readdir_search_pagecache(); |
| 460 | * |
| 461 | * NOTE: we cannot add the anonymous page to the pagecache because |
| 462 | * the data it contains might not be page aligned. Besides, |
| 463 | * we should already have a complete representation of the |
| 464 | * directory in the page cache by the time we get here. |
| 465 | */ |
| 466 | static inline |
| 467 | int uncached_readdir(nfs_readdir_descriptor_t *desc, void *dirent, |
| 468 | filldir_t filldir) |
| 469 | { |
| 470 | struct file *file = desc->file; |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 471 | struct inode *inode = file->f_path.dentry->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 472 | struct rpc_cred *cred = nfs_file_cred(file); |
| 473 | struct page *page = NULL; |
| 474 | int status; |
Neil Brown | 1f4eab7 | 2007-04-16 09:35:27 +1000 | [diff] [blame] | 475 | unsigned long timestamp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 476 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 477 | dfprintk(DIRCACHE, "NFS: uncached_readdir() searching for cookie %Lu\n", |
| 478 | (unsigned long long)*desc->dir_cookie); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 479 | |
| 480 | page = alloc_page(GFP_HIGHUSER); |
| 481 | if (!page) { |
| 482 | status = -ENOMEM; |
| 483 | goto out; |
| 484 | } |
Neil Brown | 1f4eab7 | 2007-04-16 09:35:27 +1000 | [diff] [blame] | 485 | timestamp = jiffies; |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 486 | 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] | 487 | page, |
| 488 | NFS_SERVER(inode)->dtsize, |
| 489 | desc->plus); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | desc->page = page; |
| 491 | desc->ptr = kmap(page); /* matching kunmap in nfs_do_filldir */ |
| 492 | if (desc->error >= 0) { |
Neil Brown | 1f4eab7 | 2007-04-16 09:35:27 +1000 | [diff] [blame] | 493 | desc->timestamp = timestamp; |
| 494 | desc->timestamp_valid = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 495 | if ((status = dir_decode(desc)) == 0) |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 496 | desc->entry->prev_cookie = *desc->dir_cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 497 | } else |
| 498 | status = -EIO; |
| 499 | if (status < 0) |
| 500 | goto out_release; |
| 501 | |
| 502 | status = nfs_do_filldir(desc, dirent, filldir); |
| 503 | |
| 504 | /* Reset read descriptor so it searches the page cache from |
| 505 | * the start upon the next call to readdir_search_pagecache() */ |
| 506 | desc->page_index = 0; |
| 507 | desc->entry->cookie = desc->entry->prev_cookie = 0; |
| 508 | desc->entry->eof = 0; |
| 509 | out: |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 510 | dfprintk(DIRCACHE, "NFS: %s: returns %d\n", |
| 511 | __FUNCTION__, status); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 512 | return status; |
| 513 | out_release: |
| 514 | dir_page_release(desc); |
| 515 | goto out; |
| 516 | } |
| 517 | |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 518 | /* The file offset position represents the dirent entry number. A |
| 519 | last cookie cache takes care of the common case of reading the |
| 520 | whole directory. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | */ |
| 522 | static int nfs_readdir(struct file *filp, void *dirent, filldir_t filldir) |
| 523 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 524 | struct dentry *dentry = filp->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | struct inode *inode = dentry->d_inode; |
| 526 | nfs_readdir_descriptor_t my_desc, |
| 527 | *desc = &my_desc; |
| 528 | struct nfs_entry my_entry; |
| 529 | struct nfs_fh fh; |
| 530 | struct nfs_fattr fattr; |
| 531 | long res; |
| 532 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 533 | dfprintk(VFS, "NFS: readdir(%s/%s) starting at cookie %Lu\n", |
| 534 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 535 | (long long)filp->f_pos); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 536 | nfs_inc_stats(inode, NFSIOS_VFSGETDENTS); |
| 537 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 538 | lock_kernel(); |
| 539 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 540 | /* |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 541 | * filp->f_pos points to the dirent entry number. |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 542 | * *desc->dir_cookie has the cookie for the next entry. We have |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 543 | * to either find the entry with the appropriate number or |
| 544 | * revalidate the cookie. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 545 | */ |
| 546 | memset(desc, 0, sizeof(*desc)); |
| 547 | |
| 548 | desc->file = filp; |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 549 | desc->dir_cookie = &nfs_file_open_context(filp)->dir_cookie; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 550 | desc->decode = NFS_PROTO(inode)->decode_dirent; |
| 551 | desc->plus = NFS_USE_READDIRPLUS(inode); |
| 552 | |
| 553 | my_entry.cookie = my_entry.prev_cookie = 0; |
| 554 | my_entry.eof = 0; |
| 555 | my_entry.fh = &fh; |
| 556 | my_entry.fattr = &fattr; |
Trond Myklebust | 0e574af | 2005-10-27 22:12:38 -0400 | [diff] [blame] | 557 | nfs_fattr_init(&fattr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 558 | desc->entry = &my_entry; |
| 559 | |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 560 | nfs_block_sillyrename(dentry); |
Trond Myklebust | fccca7f | 2008-01-26 17:37:47 -0500 | [diff] [blame] | 561 | res = nfs_revalidate_mapping_nolock(inode, filp->f_mapping); |
| 562 | if (res < 0) |
| 563 | goto out; |
| 564 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | while(!desc->entry->eof) { |
| 566 | res = readdir_search_pagecache(desc); |
Olivier Galibert | 00a9264 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 567 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | if (res == -EBADCOOKIE) { |
| 569 | /* This means either end of directory */ |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 570 | if (*desc->dir_cookie && desc->entry->cookie != *desc->dir_cookie) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | /* Or that the server has 'lost' a cookie */ |
| 572 | res = uncached_readdir(desc, dirent, filldir); |
| 573 | if (res >= 0) |
| 574 | continue; |
| 575 | } |
| 576 | res = 0; |
| 577 | break; |
| 578 | } |
| 579 | if (res == -ETOOSMALL && desc->plus) { |
Chuck Lever | 412d582 | 2005-08-18 11:24:11 -0700 | [diff] [blame] | 580 | clear_bit(NFS_INO_ADVISE_RDPLUS, &NFS_FLAGS(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 581 | nfs_zap_caches(inode); |
| 582 | desc->plus = 0; |
| 583 | desc->entry->eof = 0; |
| 584 | continue; |
| 585 | } |
| 586 | if (res < 0) |
| 587 | break; |
| 588 | |
| 589 | res = nfs_do_filldir(desc, dirent, filldir); |
| 590 | if (res < 0) { |
| 591 | res = 0; |
| 592 | break; |
| 593 | } |
| 594 | } |
Trond Myklebust | fccca7f | 2008-01-26 17:37:47 -0500 | [diff] [blame] | 595 | out: |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 596 | nfs_unblock_sillyrename(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | unlock_kernel(); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 598 | if (res > 0) |
| 599 | res = 0; |
| 600 | dfprintk(VFS, "NFS: readdir(%s/%s) returns %ld\n", |
| 601 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 602 | res); |
| 603 | return res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 604 | } |
| 605 | |
Trond Myklebust | 10afec9 | 2007-05-14 17:16:04 -0400 | [diff] [blame] | 606 | 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] | 607 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 608 | mutex_lock(&filp->f_path.dentry->d_inode->i_mutex); |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 609 | switch (origin) { |
| 610 | case 1: |
| 611 | offset += filp->f_pos; |
| 612 | case 0: |
| 613 | if (offset >= 0) |
| 614 | break; |
| 615 | default: |
| 616 | offset = -EINVAL; |
| 617 | goto out; |
| 618 | } |
| 619 | if (offset != filp->f_pos) { |
| 620 | filp->f_pos = offset; |
Trond Myklebust | cd3758e | 2007-08-10 17:44:32 -0400 | [diff] [blame] | 621 | nfs_file_open_context(filp)->dir_cookie = 0; |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 622 | } |
| 623 | out: |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 624 | mutex_unlock(&filp->f_path.dentry->d_inode->i_mutex); |
Trond Myklebust | f0dd213 | 2005-06-22 17:16:29 +0000 | [diff] [blame] | 625 | return offset; |
| 626 | } |
| 627 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 628 | /* |
| 629 | * All directory operations under NFS are synchronous, so fsync() |
| 630 | * is a dummy operation. |
| 631 | */ |
Trond Myklebust | 10afec9 | 2007-05-14 17:16:04 -0400 | [diff] [blame] | 632 | 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] | 633 | { |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 634 | dfprintk(VFS, "NFS: fsync_dir(%s/%s) datasync %d\n", |
| 635 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 636 | datasync); |
| 637 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 638 | return 0; |
| 639 | } |
| 640 | |
Trond Myklebust | bfc69a4 | 2007-10-15 18:18:29 -0400 | [diff] [blame^] | 641 | /** |
| 642 | * nfs_force_lookup_revalidate - Mark the directory as having changed |
| 643 | * @dir - pointer to directory inode |
| 644 | * |
| 645 | * This forces the revalidation code in nfs_lookup_revalidate() to do a |
| 646 | * full lookup on all child dentries of 'dir' whenever a change occurs |
| 647 | * on the server that might have invalidated our dcache. |
| 648 | * |
| 649 | * The caller should be holding dir->i_lock |
| 650 | */ |
| 651 | void nfs_force_lookup_revalidate(struct inode *dir) |
| 652 | { |
| 653 | NFS_I(dir)->cache_change_attribute = jiffies; |
| 654 | } |
| 655 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 656 | /* |
| 657 | * A check for whether or not the parent directory has changed. |
| 658 | * In the case it has, we assume that the dentries are untrustworthy |
| 659 | * and may need to be looked up again. |
| 660 | */ |
Trond Myklebust | c79ba78 | 2007-01-31 08:16:24 -0500 | [diff] [blame] | 661 | static int nfs_check_verifier(struct inode *dir, struct dentry *dentry) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 662 | { |
| 663 | if (IS_ROOT(dentry)) |
| 664 | return 1; |
Trond Myklebust | f2c77f4 | 2007-10-02 12:54:39 -0400 | [diff] [blame] | 665 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
| 666 | return 0; |
| 667 | /* Revalidate nfsi->cache_change_attribute before we declare a match */ |
| 668 | if (nfs_revalidate_inode(NFS_SERVER(dir), dir) < 0) |
| 669 | return 0; |
| 670 | if (!nfs_verify_change_attribute(dir, dentry->d_time)) |
| 671 | return 0; |
| 672 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 673 | } |
| 674 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 675 | /* |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 676 | * Return the intent data that applies to this particular path component |
| 677 | * |
| 678 | * Note that the current set of intents only apply to the very last |
| 679 | * component of the path. |
| 680 | * We check for this using LOOKUP_CONTINUE and LOOKUP_PARENT. |
| 681 | */ |
| 682 | static inline unsigned int nfs_lookup_check_intent(struct nameidata *nd, unsigned int mask) |
| 683 | { |
| 684 | if (nd->flags & (LOOKUP_CONTINUE|LOOKUP_PARENT)) |
| 685 | return 0; |
| 686 | return nd->flags & mask; |
| 687 | } |
| 688 | |
| 689 | /* |
Trond Myklebust | a12802c | 2007-10-02 19:13:04 -0400 | [diff] [blame] | 690 | * Use intent information to check whether or not we're going to do |
| 691 | * an O_EXCL create using this path component. |
| 692 | */ |
| 693 | static int nfs_is_exclusive_create(struct inode *dir, struct nameidata *nd) |
| 694 | { |
| 695 | if (NFS_PROTO(dir)->version == 2) |
| 696 | return 0; |
| 697 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_CREATE) == 0) |
| 698 | return 0; |
| 699 | return (nd->intent.open.flags & O_EXCL) != 0; |
| 700 | } |
| 701 | |
| 702 | /* |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 703 | * Inode and filehandle revalidation for lookups. |
| 704 | * |
| 705 | * We force revalidation in the cases where the VFS sets LOOKUP_REVAL, |
| 706 | * or if the intent information indicates that we're about to open this |
| 707 | * particular file and the "nocto" mount flag is not set. |
| 708 | * |
| 709 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 710 | static inline |
| 711 | int nfs_lookup_verify_inode(struct inode *inode, struct nameidata *nd) |
| 712 | { |
| 713 | struct nfs_server *server = NFS_SERVER(inode); |
| 714 | |
| 715 | if (nd != NULL) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | /* VFS wants an on-the-wire revalidation */ |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 717 | if (nd->flags & LOOKUP_REVAL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 718 | goto out_force; |
| 719 | /* This is an open(2) */ |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 720 | if (nfs_lookup_check_intent(nd, LOOKUP_OPEN) != 0 && |
Trond Myklebust | 4e0641a | 2006-07-05 13:05:13 -0400 | [diff] [blame] | 721 | !(server->flags & NFS_MOUNT_NOCTO) && |
| 722 | (S_ISREG(inode->i_mode) || |
| 723 | S_ISDIR(inode->i_mode))) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | goto out_force; |
Trond Myklebust | 4f48af4 | 2007-10-02 23:13:32 -0400 | [diff] [blame] | 725 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 726 | } |
| 727 | return nfs_revalidate_inode(server, inode); |
| 728 | out_force: |
| 729 | return __nfs_revalidate_inode(server, inode); |
| 730 | } |
| 731 | |
| 732 | /* |
| 733 | * We judge how long we want to trust negative |
| 734 | * dentries by looking at the parent inode mtime. |
| 735 | * |
| 736 | * If parent mtime has changed, we revalidate, else we wait for a |
| 737 | * period corresponding to the parent's attribute cache timeout value. |
| 738 | */ |
| 739 | static inline |
| 740 | int nfs_neg_need_reval(struct inode *dir, struct dentry *dentry, |
| 741 | struct nameidata *nd) |
| 742 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 743 | /* 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] | 744 | if (nd != NULL && nfs_lookup_check_intent(nd, LOOKUP_CREATE) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | return 0; |
| 746 | return !nfs_check_verifier(dir, dentry); |
| 747 | } |
| 748 | |
| 749 | /* |
| 750 | * This is called every time the dcache has a lookup hit, |
| 751 | * and we should check whether we can really trust that |
| 752 | * lookup. |
| 753 | * |
| 754 | * NOTE! The hit can be a negative hit too, don't assume |
| 755 | * we have an inode! |
| 756 | * |
| 757 | * If the parent directory is seen to have changed, we throw out the |
| 758 | * cached dentry and do a new lookup. |
| 759 | */ |
| 760 | static int nfs_lookup_revalidate(struct dentry * dentry, struct nameidata *nd) |
| 761 | { |
| 762 | struct inode *dir; |
| 763 | struct inode *inode; |
| 764 | struct dentry *parent; |
| 765 | int error; |
| 766 | struct nfs_fh fhandle; |
| 767 | struct nfs_fattr fattr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 768 | |
| 769 | parent = dget_parent(dentry); |
| 770 | lock_kernel(); |
| 771 | dir = parent->d_inode; |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 772 | nfs_inc_stats(dir, NFSIOS_DENTRYREVALIDATE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 773 | inode = dentry->d_inode; |
| 774 | |
| 775 | if (!inode) { |
| 776 | if (nfs_neg_need_reval(dir, dentry, nd)) |
| 777 | goto out_bad; |
| 778 | goto out_valid; |
| 779 | } |
| 780 | |
| 781 | if (is_bad_inode(inode)) { |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 782 | dfprintk(LOOKUPCACHE, "%s: %s/%s has dud inode\n", |
| 783 | __FUNCTION__, dentry->d_parent->d_name.name, |
| 784 | dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 785 | goto out_bad; |
| 786 | } |
| 787 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 788 | /* Force a full look up iff the parent directory has changed */ |
Trond Myklebust | a12802c | 2007-10-02 19:13:04 -0400 | [diff] [blame] | 789 | if (!nfs_is_exclusive_create(dir, nd) && nfs_check_verifier(dir, dentry)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | if (nfs_lookup_verify_inode(inode, nd)) |
| 791 | goto out_zap_parent; |
| 792 | goto out_valid; |
| 793 | } |
| 794 | |
| 795 | if (NFS_STALE(inode)) |
| 796 | goto out_bad; |
| 797 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 798 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr); |
| 799 | if (error) |
| 800 | goto out_bad; |
| 801 | if (nfs_compare_fh(NFS_FH(inode), &fhandle)) |
| 802 | goto out_bad; |
| 803 | if ((error = nfs_refresh_inode(inode, &fattr)) != 0) |
| 804 | goto out_bad; |
| 805 | |
Trond Myklebust | cf8ba45 | 2007-10-01 13:46:53 -0400 | [diff] [blame] | 806 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 807 | out_valid: |
| 808 | unlock_kernel(); |
| 809 | dput(parent); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 810 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is valid\n", |
| 811 | __FUNCTION__, dentry->d_parent->d_name.name, |
| 812 | dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 813 | return 1; |
| 814 | out_zap_parent: |
| 815 | nfs_zap_caches(dir); |
| 816 | out_bad: |
Trond Myklebust | a1643a9 | 2007-09-29 17:25:43 -0400 | [diff] [blame] | 817 | nfs_mark_for_revalidate(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | if (inode && S_ISDIR(inode->i_mode)) { |
| 819 | /* Purge readdir caches. */ |
| 820 | nfs_zap_caches(inode); |
| 821 | /* If we have submounts, don't unhash ! */ |
| 822 | if (have_submounts(dentry)) |
| 823 | goto out_valid; |
| 824 | shrink_dcache_parent(dentry); |
| 825 | } |
| 826 | d_drop(dentry); |
| 827 | unlock_kernel(); |
| 828 | dput(parent); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 829 | dfprintk(LOOKUPCACHE, "NFS: %s(%s/%s) is invalid\n", |
| 830 | __FUNCTION__, dentry->d_parent->d_name.name, |
| 831 | dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | return 0; |
| 833 | } |
| 834 | |
| 835 | /* |
| 836 | * This is called from dput() when d_count is going to 0. |
| 837 | */ |
| 838 | static int nfs_dentry_delete(struct dentry *dentry) |
| 839 | { |
| 840 | dfprintk(VFS, "NFS: dentry_delete(%s/%s, %x)\n", |
| 841 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 842 | dentry->d_flags); |
| 843 | |
Trond Myklebust | 77f1119 | 2008-01-28 19:43:19 -0500 | [diff] [blame] | 844 | /* Unhash any dentry with a stale inode */ |
| 845 | if (dentry->d_inode != NULL && NFS_STALE(dentry->d_inode)) |
| 846 | return 1; |
| 847 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
| 849 | /* Unhash it, so that ->d_iput() would be called */ |
| 850 | return 1; |
| 851 | } |
| 852 | if (!(dentry->d_sb->s_flags & MS_ACTIVE)) { |
| 853 | /* Unhash it, so that ancestors of killed async unlink |
| 854 | * files will be cleaned up during umount */ |
| 855 | return 1; |
| 856 | } |
| 857 | return 0; |
| 858 | |
| 859 | } |
| 860 | |
| 861 | /* |
| 862 | * Called when the dentry loses inode. |
| 863 | * We use it to clean up silly-renamed files. |
| 864 | */ |
| 865 | static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode) |
| 866 | { |
Trond Myklebust | cae7a07 | 2005-10-18 14:20:19 -0700 | [diff] [blame] | 867 | nfs_inode_return_delegation(inode); |
Neil Brown | 83672d3 | 2007-02-26 12:48:25 +1100 | [diff] [blame] | 868 | if (S_ISDIR(inode->i_mode)) |
| 869 | /* drop any readdir cache as it could easily be old */ |
| 870 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_DATA; |
| 871 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 872 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
| 873 | lock_kernel(); |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 874 | drop_nlink(inode); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 875 | nfs_complete_unlink(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 876 | unlock_kernel(); |
| 877 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 878 | iput(inode); |
| 879 | } |
| 880 | |
| 881 | struct dentry_operations nfs_dentry_operations = { |
| 882 | .d_revalidate = nfs_lookup_revalidate, |
| 883 | .d_delete = nfs_dentry_delete, |
| 884 | .d_iput = nfs_dentry_iput, |
| 885 | }; |
| 886 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 887 | static struct dentry *nfs_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd) |
| 888 | { |
| 889 | struct dentry *res; |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 890 | struct dentry *parent; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 891 | struct inode *inode = NULL; |
| 892 | int error; |
| 893 | struct nfs_fh fhandle; |
| 894 | struct nfs_fattr fattr; |
| 895 | |
| 896 | dfprintk(VFS, "NFS: lookup(%s/%s)\n", |
| 897 | dentry->d_parent->d_name.name, dentry->d_name.name); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 898 | nfs_inc_stats(dir, NFSIOS_VFSLOOKUP); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 899 | |
| 900 | res = ERR_PTR(-ENAMETOOLONG); |
| 901 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) |
| 902 | goto out; |
| 903 | |
| 904 | res = ERR_PTR(-ENOMEM); |
| 905 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; |
| 906 | |
| 907 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | |
Trond Myklebust | fd68407 | 2006-09-05 12:27:44 -0400 | [diff] [blame] | 909 | /* |
| 910 | * If we're doing an exclusive create, optimize away the lookup |
| 911 | * but don't hash the dentry. |
| 912 | */ |
| 913 | if (nfs_is_exclusive_create(dir, nd)) { |
| 914 | d_instantiate(dentry, NULL); |
| 915 | res = NULL; |
| 916 | goto out_unlock; |
| 917 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 918 | |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 919 | parent = dentry->d_parent; |
| 920 | /* Protect against concurrent sillydeletes */ |
| 921 | nfs_block_sillyrename(parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, &fhandle, &fattr); |
| 923 | if (error == -ENOENT) |
| 924 | goto no_entry; |
| 925 | if (error < 0) { |
| 926 | res = ERR_PTR(error); |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 927 | goto out_unblock_sillyrename; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | inode = nfs_fhget(dentry->d_sb, &fhandle, &fattr); |
Trond Myklebust | 03f28e3 | 2006-03-20 13:44:48 -0500 | [diff] [blame] | 930 | res = (struct dentry *)inode; |
| 931 | if (IS_ERR(res)) |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 932 | goto out_unblock_sillyrename; |
David Howells | 54ceac4 | 2006-08-22 20:06:13 -0400 | [diff] [blame] | 933 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | no_entry: |
David Howells | 54ceac4 | 2006-08-22 20:06:13 -0400 | [diff] [blame] | 935 | res = d_materialise_unique(dentry, inode); |
Trond Myklebust | 9eaef27 | 2006-10-21 10:24:20 -0700 | [diff] [blame] | 936 | if (res != NULL) { |
| 937 | if (IS_ERR(res)) |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 938 | goto out_unblock_sillyrename; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 939 | dentry = res; |
Trond Myklebust | 9eaef27 | 2006-10-21 10:24:20 -0700 | [diff] [blame] | 940 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
Trond Myklebust | 565277f | 2007-10-15 18:17:53 -0400 | [diff] [blame] | 942 | out_unblock_sillyrename: |
| 943 | nfs_unblock_sillyrename(parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 944 | out_unlock: |
| 945 | unlock_kernel(); |
| 946 | out: |
| 947 | return res; |
| 948 | } |
| 949 | |
| 950 | #ifdef CONFIG_NFS_V4 |
| 951 | static int nfs_open_revalidate(struct dentry *, struct nameidata *); |
| 952 | |
| 953 | struct dentry_operations nfs4_dentry_operations = { |
| 954 | .d_revalidate = nfs_open_revalidate, |
| 955 | .d_delete = nfs_dentry_delete, |
| 956 | .d_iput = nfs_dentry_iput, |
| 957 | }; |
| 958 | |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 959 | /* |
| 960 | * Use intent information to determine whether we need to substitute |
| 961 | * the NFSv4-style stateful OPEN for the LOOKUP call |
| 962 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 963 | static int is_atomic_open(struct inode *dir, struct nameidata *nd) |
| 964 | { |
Trond Myklebust | 1d6757f | 2005-06-07 18:37:01 -0400 | [diff] [blame] | 965 | if (nd == NULL || nfs_lookup_check_intent(nd, LOOKUP_OPEN) == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 966 | return 0; |
| 967 | /* NFS does not (yet) have a stateful open for directories */ |
| 968 | if (nd->flags & LOOKUP_DIRECTORY) |
| 969 | return 0; |
| 970 | /* Are we trying to write to a read only partition? */ |
| 971 | if (IS_RDONLY(dir) && (nd->intent.open.flags & (O_CREAT|O_TRUNC|FMODE_WRITE))) |
| 972 | return 0; |
| 973 | return 1; |
| 974 | } |
| 975 | |
| 976 | static struct dentry *nfs_atomic_lookup(struct inode *dir, struct dentry *dentry, struct nameidata *nd) |
| 977 | { |
| 978 | struct dentry *res = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 979 | int error; |
| 980 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 981 | dfprintk(VFS, "NFS: atomic_lookup(%s/%ld), %s\n", |
| 982 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
| 983 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 984 | /* Check that we are indeed trying to open this file */ |
| 985 | if (!is_atomic_open(dir, nd)) |
| 986 | goto no_open; |
| 987 | |
| 988 | if (dentry->d_name.len > NFS_SERVER(dir)->namelen) { |
| 989 | res = ERR_PTR(-ENAMETOOLONG); |
| 990 | goto out; |
| 991 | } |
| 992 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; |
| 993 | |
Trond Myklebust | d4d9cdc | 2007-10-02 18:38:53 -0400 | [diff] [blame] | 994 | /* Let vfs_create() deal with O_EXCL. Instantiate, but don't hash |
| 995 | * the dentry. */ |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 996 | if (nd->intent.open.flags & O_EXCL) { |
Trond Myklebust | d4d9cdc | 2007-10-02 18:38:53 -0400 | [diff] [blame] | 997 | d_instantiate(dentry, NULL); |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 998 | goto out; |
| 999 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | |
| 1001 | /* Open the file on the server */ |
| 1002 | lock_kernel(); |
Trond Myklebust | 60ccd4e | 2007-09-29 17:48:19 -0400 | [diff] [blame] | 1003 | res = nfs4_atomic_open(dir, dentry, nd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | unlock_kernel(); |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 1005 | if (IS_ERR(res)) { |
| 1006 | error = PTR_ERR(res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1007 | switch (error) { |
| 1008 | /* Make a negative dentry */ |
| 1009 | case -ENOENT: |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 1010 | res = NULL; |
| 1011 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | /* This turned out not to be a regular file */ |
Trond Myklebust | 6f926b5 | 2005-10-18 14:20:18 -0700 | [diff] [blame] | 1013 | case -EISDIR: |
| 1014 | case -ENOTDIR: |
| 1015 | goto no_open; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1016 | case -ELOOP: |
| 1017 | if (!(nd->intent.open.flags & O_NOFOLLOW)) |
| 1018 | goto no_open; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1019 | /* case -EINVAL: */ |
| 1020 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1021 | goto out; |
| 1022 | } |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 1023 | } else if (res != NULL) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1024 | dentry = res; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | out: |
| 1026 | return res; |
| 1027 | no_open: |
| 1028 | return nfs_lookup(dir, dentry, nd); |
| 1029 | } |
| 1030 | |
| 1031 | static int nfs_open_revalidate(struct dentry *dentry, struct nameidata *nd) |
| 1032 | { |
| 1033 | struct dentry *parent = NULL; |
| 1034 | struct inode *inode = dentry->d_inode; |
| 1035 | struct inode *dir; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1036 | int openflags, ret = 0; |
| 1037 | |
| 1038 | parent = dget_parent(dentry); |
| 1039 | dir = parent->d_inode; |
| 1040 | if (!is_atomic_open(dir, nd)) |
| 1041 | goto no_open; |
| 1042 | /* We can't create new files in nfs_open_revalidate(), so we |
| 1043 | * optimize away revalidation of negative dentries. |
| 1044 | */ |
Trond Myklebust | 216d5d0 | 2007-10-01 20:10:12 -0400 | [diff] [blame] | 1045 | if (inode == NULL) { |
| 1046 | if (!nfs_neg_need_reval(dir, dentry, nd)) |
| 1047 | ret = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1048 | goto out; |
Trond Myklebust | 216d5d0 | 2007-10-01 20:10:12 -0400 | [diff] [blame] | 1049 | } |
| 1050 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1051 | /* NFS only supports OPEN on regular files */ |
| 1052 | if (!S_ISREG(inode->i_mode)) |
| 1053 | goto no_open; |
| 1054 | openflags = nd->intent.open.flags; |
| 1055 | /* We cannot do exclusive creation on a positive dentry */ |
| 1056 | if ((openflags & (O_CREAT|O_EXCL)) == (O_CREAT|O_EXCL)) |
| 1057 | goto no_open; |
| 1058 | /* We can't create new files, or truncate existing ones here */ |
| 1059 | openflags &= ~(O_CREAT|O_TRUNC); |
| 1060 | |
| 1061 | /* |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 1062 | * 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] | 1063 | * operations that change the directory. We therefore save the |
| 1064 | * change attribute *before* we do the RPC call. |
| 1065 | */ |
| 1066 | lock_kernel(); |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 1067 | ret = nfs4_open_revalidate(dir, dentry, openflags, nd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1068 | unlock_kernel(); |
| 1069 | out: |
| 1070 | dput(parent); |
| 1071 | if (!ret) |
| 1072 | d_drop(dentry); |
| 1073 | return ret; |
| 1074 | no_open: |
| 1075 | dput(parent); |
| 1076 | if (inode != NULL && nfs_have_delegation(inode, FMODE_READ)) |
| 1077 | return 1; |
| 1078 | return nfs_lookup_revalidate(dentry, nd); |
| 1079 | } |
| 1080 | #endif /* CONFIG_NFSV4 */ |
| 1081 | |
| 1082 | static struct dentry *nfs_readdir_lookup(nfs_readdir_descriptor_t *desc) |
| 1083 | { |
Josef "Jeff" Sipek | 01cce93 | 2006-12-08 02:36:40 -0800 | [diff] [blame] | 1084 | struct dentry *parent = desc->file->f_path.dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1085 | struct inode *dir = parent->d_inode; |
| 1086 | struct nfs_entry *entry = desc->entry; |
| 1087 | struct dentry *dentry, *alias; |
| 1088 | struct qstr name = { |
| 1089 | .name = entry->name, |
| 1090 | .len = entry->len, |
| 1091 | }; |
| 1092 | struct inode *inode; |
Trond Myklebust | 57fa76f | 2007-09-30 18:01:13 -0400 | [diff] [blame] | 1093 | unsigned long verf = nfs_save_change_attribute(dir); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1094 | |
| 1095 | switch (name.len) { |
| 1096 | case 2: |
| 1097 | if (name.name[0] == '.' && name.name[1] == '.') |
| 1098 | return dget_parent(parent); |
| 1099 | break; |
| 1100 | case 1: |
| 1101 | if (name.name[0] == '.') |
| 1102 | return dget(parent); |
| 1103 | } |
Trond Myklebust | 57fa76f | 2007-09-30 18:01:13 -0400 | [diff] [blame] | 1104 | |
| 1105 | spin_lock(&dir->i_lock); |
| 1106 | if (NFS_I(dir)->cache_validity & NFS_INO_INVALID_DATA) { |
| 1107 | spin_unlock(&dir->i_lock); |
| 1108 | return NULL; |
| 1109 | } |
| 1110 | spin_unlock(&dir->i_lock); |
| 1111 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1112 | name.hash = full_name_hash(name.name, name.len); |
| 1113 | dentry = d_lookup(parent, &name); |
Trond Myklebust | df1d5d2 | 2007-01-15 13:56:29 -0500 | [diff] [blame] | 1114 | if (dentry != NULL) { |
Trond Myklebust | ef75c79 | 2007-01-16 10:09:44 -0500 | [diff] [blame] | 1115 | /* Is this a positive dentry that matches the readdir info? */ |
| 1116 | if (dentry->d_inode != NULL && |
| 1117 | (NFS_FILEID(dentry->d_inode) == entry->ino || |
| 1118 | d_mountpoint(dentry))) { |
| 1119 | if (!desc->plus || entry->fh->size == 0) |
| 1120 | return dentry; |
| 1121 | if (nfs_compare_fh(NFS_FH(dentry->d_inode), |
| 1122 | entry->fh) == 0) |
| 1123 | goto out_renew; |
| 1124 | } |
Trond Myklebust | df1d5d2 | 2007-01-15 13:56:29 -0500 | [diff] [blame] | 1125 | /* No, so d_drop to allow one to be created */ |
| 1126 | d_drop(dentry); |
| 1127 | dput(dentry); |
| 1128 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1129 | if (!desc->plus || !(entry->fattr->valid & NFS_ATTR_FATTR)) |
| 1130 | return NULL; |
Trond Myklebust | 54af3bb | 2007-09-28 12:27:41 -0400 | [diff] [blame] | 1131 | if (name.len > NFS_SERVER(dir)->namelen) |
| 1132 | return NULL; |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 1133 | /* Note: caller is already holding the dir->i_mutex! */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1134 | dentry = d_alloc(parent, &name); |
| 1135 | if (dentry == NULL) |
| 1136 | return NULL; |
| 1137 | dentry->d_op = NFS_PROTO(dir)->dentry_ops; |
| 1138 | inode = nfs_fhget(dentry->d_sb, entry->fh, entry->fattr); |
Trond Myklebust | 03f28e3 | 2006-03-20 13:44:48 -0500 | [diff] [blame] | 1139 | if (IS_ERR(inode)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1140 | dput(dentry); |
| 1141 | return NULL; |
| 1142 | } |
David Howells | 54ceac4 | 2006-08-22 20:06:13 -0400 | [diff] [blame] | 1143 | |
| 1144 | alias = d_materialise_unique(dentry, inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1145 | if (alias != NULL) { |
| 1146 | dput(dentry); |
Trond Myklebust | 9eaef27 | 2006-10-21 10:24:20 -0700 | [diff] [blame] | 1147 | if (IS_ERR(alias)) |
| 1148 | return NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1149 | dentry = alias; |
| 1150 | } |
David Howells | 54ceac4 | 2006-08-22 20:06:13 -0400 | [diff] [blame] | 1151 | |
Trond Myklebust | c79ba78 | 2007-01-31 08:16:24 -0500 | [diff] [blame] | 1152 | out_renew: |
Trond Myklebust | 57fa76f | 2007-09-30 18:01:13 -0400 | [diff] [blame] | 1153 | nfs_set_verifier(dentry, verf); |
Trond Myklebust | c79ba78 | 2007-01-31 08:16:24 -0500 | [diff] [blame] | 1154 | return dentry; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | } |
| 1156 | |
| 1157 | /* |
| 1158 | * Code common to create, mkdir, and mknod. |
| 1159 | */ |
| 1160 | int nfs_instantiate(struct dentry *dentry, struct nfs_fh *fhandle, |
| 1161 | struct nfs_fattr *fattr) |
| 1162 | { |
Trond Myklebust | fab728e | 2007-09-29 17:41:33 -0400 | [diff] [blame] | 1163 | struct dentry *parent = dget_parent(dentry); |
| 1164 | struct inode *dir = parent->d_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1165 | struct inode *inode; |
| 1166 | int error = -EACCES; |
| 1167 | |
Trond Myklebust | fab728e | 2007-09-29 17:41:33 -0400 | [diff] [blame] | 1168 | d_drop(dentry); |
| 1169 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1170 | /* We may have been initialized further down */ |
| 1171 | if (dentry->d_inode) |
Trond Myklebust | fab728e | 2007-09-29 17:41:33 -0400 | [diff] [blame] | 1172 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1173 | if (fhandle->size == 0) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1174 | error = NFS_PROTO(dir)->lookup(dir, &dentry->d_name, fhandle, fattr); |
| 1175 | if (error) |
Trond Myklebust | fab728e | 2007-09-29 17:41:33 -0400 | [diff] [blame] | 1176 | goto out_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1177 | } |
Trond Myklebust | 5724ab3 | 2007-10-01 21:51:38 -0400 | [diff] [blame] | 1178 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1179 | if (!(fattr->valid & NFS_ATTR_FATTR)) { |
| 1180 | struct nfs_server *server = NFS_SB(dentry->d_sb); |
David Howells | 8fa5c00 | 2006-08-22 20:06:12 -0400 | [diff] [blame] | 1181 | error = server->nfs_client->rpc_ops->getattr(server, fhandle, fattr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | if (error < 0) |
Trond Myklebust | fab728e | 2007-09-29 17:41:33 -0400 | [diff] [blame] | 1183 | goto out_error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1184 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | inode = nfs_fhget(dentry->d_sb, fhandle, fattr); |
Trond Myklebust | 03f28e3 | 2006-03-20 13:44:48 -0500 | [diff] [blame] | 1186 | error = PTR_ERR(inode); |
| 1187 | if (IS_ERR(inode)) |
Trond Myklebust | fab728e | 2007-09-29 17:41:33 -0400 | [diff] [blame] | 1188 | goto out_error; |
| 1189 | d_add(dentry, inode); |
| 1190 | out: |
| 1191 | dput(parent); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1192 | return 0; |
Trond Myklebust | fab728e | 2007-09-29 17:41:33 -0400 | [diff] [blame] | 1193 | out_error: |
| 1194 | nfs_mark_for_revalidate(dir); |
| 1195 | dput(parent); |
| 1196 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1197 | } |
| 1198 | |
| 1199 | /* |
| 1200 | * Following a failed create operation, we drop the dentry rather |
| 1201 | * than retain a negative dentry. This avoids a problem in the event |
| 1202 | * that the operation succeeded on the server, but an error in the |
| 1203 | * reply path made it appear to have failed. |
| 1204 | */ |
| 1205 | static int nfs_create(struct inode *dir, struct dentry *dentry, int mode, |
| 1206 | struct nameidata *nd) |
| 1207 | { |
| 1208 | struct iattr attr; |
| 1209 | int error; |
| 1210 | int open_flags = 0; |
| 1211 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1212 | dfprintk(VFS, "NFS: create(%s/%ld), %s\n", |
| 1213 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1214 | |
| 1215 | attr.ia_mode = mode; |
| 1216 | attr.ia_valid = ATTR_MODE; |
| 1217 | |
Trond Myklebust | ad389da | 2007-06-05 12:30:00 -0400 | [diff] [blame] | 1218 | if ((nd->flags & LOOKUP_CREATE) != 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1219 | open_flags = nd->intent.open.flags; |
| 1220 | |
| 1221 | lock_kernel(); |
Trond Myklebust | 02a913a | 2005-10-18 14:20:17 -0700 | [diff] [blame] | 1222 | error = NFS_PROTO(dir)->create(dir, dentry, &attr, open_flags, nd); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1223 | if (error != 0) |
| 1224 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1225 | unlock_kernel(); |
| 1226 | return 0; |
| 1227 | out_err: |
| 1228 | unlock_kernel(); |
| 1229 | d_drop(dentry); |
| 1230 | return error; |
| 1231 | } |
| 1232 | |
| 1233 | /* |
| 1234 | * See comments for nfs_proc_create regarding failed operations. |
| 1235 | */ |
| 1236 | static int |
| 1237 | nfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev) |
| 1238 | { |
| 1239 | struct iattr attr; |
| 1240 | int status; |
| 1241 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1242 | dfprintk(VFS, "NFS: mknod(%s/%ld), %s\n", |
| 1243 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1244 | |
| 1245 | if (!new_valid_dev(rdev)) |
| 1246 | return -EINVAL; |
| 1247 | |
| 1248 | attr.ia_mode = mode; |
| 1249 | attr.ia_valid = ATTR_MODE; |
| 1250 | |
| 1251 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | status = NFS_PROTO(dir)->mknod(dir, dentry, &attr, rdev); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | if (status != 0) |
| 1254 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | unlock_kernel(); |
| 1256 | return 0; |
| 1257 | out_err: |
| 1258 | unlock_kernel(); |
| 1259 | d_drop(dentry); |
| 1260 | return status; |
| 1261 | } |
| 1262 | |
| 1263 | /* |
| 1264 | * See comments for nfs_proc_create regarding failed operations. |
| 1265 | */ |
| 1266 | static int nfs_mkdir(struct inode *dir, struct dentry *dentry, int mode) |
| 1267 | { |
| 1268 | struct iattr attr; |
| 1269 | int error; |
| 1270 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1271 | dfprintk(VFS, "NFS: mkdir(%s/%ld), %s\n", |
| 1272 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | |
| 1274 | attr.ia_valid = ATTR_MODE; |
| 1275 | attr.ia_mode = mode | S_IFDIR; |
| 1276 | |
| 1277 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | error = NFS_PROTO(dir)->mkdir(dir, dentry, &attr); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1279 | if (error != 0) |
| 1280 | goto out_err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1281 | unlock_kernel(); |
| 1282 | return 0; |
| 1283 | out_err: |
| 1284 | d_drop(dentry); |
| 1285 | unlock_kernel(); |
| 1286 | return error; |
| 1287 | } |
| 1288 | |
Trond Myklebust | d45b9d8 | 2008-01-28 19:43:18 -0500 | [diff] [blame] | 1289 | static void nfs_dentry_handle_enoent(struct dentry *dentry) |
| 1290 | { |
| 1291 | if (dentry->d_inode != NULL && !d_unhashed(dentry)) |
| 1292 | d_delete(dentry); |
| 1293 | } |
| 1294 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | static int nfs_rmdir(struct inode *dir, struct dentry *dentry) |
| 1296 | { |
| 1297 | int error; |
| 1298 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1299 | dfprintk(VFS, "NFS: rmdir(%s/%ld), %s\n", |
| 1300 | dir->i_sb->s_id, dir->i_ino, dentry->d_name.name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | |
| 1302 | lock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | error = NFS_PROTO(dir)->rmdir(dir, &dentry->d_name); |
| 1304 | /* Ensure the VFS deletes this inode */ |
| 1305 | if (error == 0 && dentry->d_inode != NULL) |
Dave Hansen | ce71ec3 | 2006-09-30 23:29:06 -0700 | [diff] [blame] | 1306 | clear_nlink(dentry->d_inode); |
Trond Myklebust | d45b9d8 | 2008-01-28 19:43:18 -0500 | [diff] [blame] | 1307 | else if (error == -ENOENT) |
| 1308 | nfs_dentry_handle_enoent(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1309 | unlock_kernel(); |
| 1310 | |
| 1311 | return error; |
| 1312 | } |
| 1313 | |
| 1314 | static int nfs_sillyrename(struct inode *dir, struct dentry *dentry) |
| 1315 | { |
| 1316 | static unsigned int sillycounter; |
Peter Staubach | 4e769b9 | 2007-08-03 15:07:10 -0400 | [diff] [blame] | 1317 | const int fileidsize = sizeof(NFS_FILEID(dentry->d_inode))*2; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1318 | const int countersize = sizeof(sillycounter)*2; |
Peter Staubach | 4e769b9 | 2007-08-03 15:07:10 -0400 | [diff] [blame] | 1319 | const int slen = sizeof(".nfs")+fileidsize+countersize-1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1320 | char silly[slen+1]; |
| 1321 | struct qstr qsilly; |
| 1322 | struct dentry *sdentry; |
| 1323 | int error = -EIO; |
| 1324 | |
| 1325 | dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n", |
| 1326 | dentry->d_parent->d_name.name, dentry->d_name.name, |
| 1327 | atomic_read(&dentry->d_count)); |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1328 | nfs_inc_stats(dir, NFSIOS_SILLYRENAME); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1329 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1330 | /* |
| 1331 | * We don't allow a dentry to be silly-renamed twice. |
| 1332 | */ |
| 1333 | error = -EBUSY; |
| 1334 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) |
| 1335 | goto out; |
| 1336 | |
Peter Staubach | 4e769b9 | 2007-08-03 15:07:10 -0400 | [diff] [blame] | 1337 | sprintf(silly, ".nfs%*.*Lx", |
| 1338 | fileidsize, fileidsize, |
| 1339 | (unsigned long long)NFS_FILEID(dentry->d_inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1340 | |
Trond Myklebust | 34ea818 | 2005-11-04 15:35:02 -0500 | [diff] [blame] | 1341 | /* Return delegation in anticipation of the rename */ |
| 1342 | nfs_inode_return_delegation(dentry->d_inode); |
| 1343 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1344 | sdentry = NULL; |
| 1345 | do { |
| 1346 | char *suffix = silly + slen - countersize; |
| 1347 | |
| 1348 | dput(sdentry); |
| 1349 | sillycounter++; |
| 1350 | sprintf(suffix, "%*.*x", countersize, countersize, sillycounter); |
| 1351 | |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1352 | dfprintk(VFS, "NFS: trying to rename %s to %s\n", |
| 1353 | dentry->d_name.name, silly); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1354 | |
| 1355 | sdentry = lookup_one_len(silly, dentry->d_parent, slen); |
| 1356 | /* |
| 1357 | * N.B. Better to return EBUSY here ... it could be |
| 1358 | * dangerous to delete the file while it's in use. |
| 1359 | */ |
| 1360 | if (IS_ERR(sdentry)) |
| 1361 | goto out; |
| 1362 | } while(sdentry->d_inode != NULL); /* need negative lookup */ |
| 1363 | |
| 1364 | qsilly.name = silly; |
| 1365 | qsilly.len = strlen(silly); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | if (dentry->d_inode) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1367 | error = NFS_PROTO(dir)->rename(dir, &dentry->d_name, |
| 1368 | dir, &qsilly); |
Trond Myklebust | 5ba7cc4 | 2005-12-03 15:20:17 -0500 | [diff] [blame] | 1369 | nfs_mark_for_revalidate(dentry->d_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1370 | } else |
| 1371 | error = NFS_PROTO(dir)->rename(dir, &dentry->d_name, |
| 1372 | dir, &qsilly); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1373 | if (!error) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1374 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 1375 | d_move(dentry, sdentry); |
Trond Myklebust | e4eff1a | 2007-07-14 15:39:58 -0400 | [diff] [blame] | 1376 | error = nfs_async_unlink(dir, dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1377 | /* If we return 0 we don't unlink */ |
| 1378 | } |
| 1379 | dput(sdentry); |
| 1380 | out: |
| 1381 | return error; |
| 1382 | } |
| 1383 | |
| 1384 | /* |
| 1385 | * Remove a file after making sure there are no pending writes, |
| 1386 | * and after checking that the file has only one user. |
| 1387 | * |
| 1388 | * We invalidate the attribute cache and free the inode prior to the operation |
| 1389 | * to avoid possible races if the server reuses the inode. |
| 1390 | */ |
| 1391 | static int nfs_safe_remove(struct dentry *dentry) |
| 1392 | { |
| 1393 | struct inode *dir = dentry->d_parent->d_inode; |
| 1394 | struct inode *inode = dentry->d_inode; |
| 1395 | int error = -EBUSY; |
| 1396 | |
| 1397 | dfprintk(VFS, "NFS: safe_remove(%s/%s)\n", |
| 1398 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 1399 | |
| 1400 | /* If the dentry was sillyrenamed, we simply call d_delete() */ |
| 1401 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
| 1402 | error = 0; |
| 1403 | goto out; |
| 1404 | } |
| 1405 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | if (inode != NULL) { |
Trond Myklebust | cae7a07 | 2005-10-18 14:20:19 -0700 | [diff] [blame] | 1407 | nfs_inode_return_delegation(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1408 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
| 1409 | /* The VFS may want to delete this inode */ |
| 1410 | if (error == 0) |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 1411 | drop_nlink(inode); |
Trond Myklebust | 5ba7cc4 | 2005-12-03 15:20:17 -0500 | [diff] [blame] | 1412 | nfs_mark_for_revalidate(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1413 | } else |
| 1414 | error = NFS_PROTO(dir)->remove(dir, &dentry->d_name); |
Trond Myklebust | d45b9d8 | 2008-01-28 19:43:18 -0500 | [diff] [blame] | 1415 | if (error == -ENOENT) |
| 1416 | nfs_dentry_handle_enoent(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1417 | out: |
| 1418 | return error; |
| 1419 | } |
| 1420 | |
| 1421 | /* We do silly rename. In case sillyrename() returns -EBUSY, the inode |
| 1422 | * belongs to an active ".nfs..." file and we return -EBUSY. |
| 1423 | * |
| 1424 | * If sillyrename() returns 0, we do nothing, otherwise we unlink. |
| 1425 | */ |
| 1426 | static int nfs_unlink(struct inode *dir, struct dentry *dentry) |
| 1427 | { |
| 1428 | int error; |
| 1429 | int need_rehash = 0; |
| 1430 | |
| 1431 | dfprintk(VFS, "NFS: unlink(%s/%ld, %s)\n", dir->i_sb->s_id, |
| 1432 | dir->i_ino, dentry->d_name.name); |
| 1433 | |
| 1434 | lock_kernel(); |
| 1435 | spin_lock(&dcache_lock); |
| 1436 | spin_lock(&dentry->d_lock); |
| 1437 | if (atomic_read(&dentry->d_count) > 1) { |
| 1438 | spin_unlock(&dentry->d_lock); |
| 1439 | spin_unlock(&dcache_lock); |
Trond Myklebust | ccfeb50 | 2007-01-13 02:28:12 -0500 | [diff] [blame] | 1440 | /* Start asynchronous writeout of the inode */ |
| 1441 | write_inode_now(dentry->d_inode, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1442 | error = nfs_sillyrename(dir, dentry); |
| 1443 | unlock_kernel(); |
| 1444 | return error; |
| 1445 | } |
| 1446 | if (!d_unhashed(dentry)) { |
| 1447 | __d_drop(dentry); |
| 1448 | need_rehash = 1; |
| 1449 | } |
| 1450 | spin_unlock(&dentry->d_lock); |
| 1451 | spin_unlock(&dcache_lock); |
| 1452 | error = nfs_safe_remove(dentry); |
Trond Myklebust | d45b9d8 | 2008-01-28 19:43:18 -0500 | [diff] [blame] | 1453 | if (!error || error == -ENOENT) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1454 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); |
| 1455 | } else if (need_rehash) |
| 1456 | d_rehash(dentry); |
| 1457 | unlock_kernel(); |
| 1458 | return error; |
| 1459 | } |
| 1460 | |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1461 | /* |
| 1462 | * To create a symbolic link, most file systems instantiate a new inode, |
| 1463 | * add a page to it containing the path, then write it out to the disk |
| 1464 | * using prepare_write/commit_write. |
| 1465 | * |
| 1466 | * Unfortunately the NFS client can't create the in-core inode first |
| 1467 | * because it needs a file handle to create an in-core inode (see |
| 1468 | * fs/nfs/inode.c:nfs_fhget). We only have a file handle *after* the |
| 1469 | * symlink request has completed on the server. |
| 1470 | * |
| 1471 | * So instead we allocate a raw page, copy the symname into it, then do |
| 1472 | * the SYMLINK request with the page as the buffer. If it succeeds, we |
| 1473 | * now have a new file handle and can instantiate an in-core NFS inode |
| 1474 | * and move the raw page into its mapping. |
| 1475 | */ |
| 1476 | 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] | 1477 | { |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1478 | struct pagevec lru_pvec; |
| 1479 | struct page *page; |
| 1480 | char *kaddr; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1481 | struct iattr attr; |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1482 | unsigned int pathlen = strlen(symname); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1483 | int error; |
| 1484 | |
| 1485 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s)\n", dir->i_sb->s_id, |
| 1486 | dir->i_ino, dentry->d_name.name, symname); |
| 1487 | |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1488 | if (pathlen > PAGE_SIZE) |
| 1489 | return -ENAMETOOLONG; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1490 | |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1491 | attr.ia_mode = S_IFLNK | S_IRWXUGO; |
| 1492 | attr.ia_valid = ATTR_MODE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1493 | |
| 1494 | lock_kernel(); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1495 | |
Jeff Layton | 83d93f2 | 2007-06-07 09:58:08 -0400 | [diff] [blame] | 1496 | page = alloc_page(GFP_HIGHUSER); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1497 | if (!page) { |
| 1498 | unlock_kernel(); |
| 1499 | return -ENOMEM; |
| 1500 | } |
| 1501 | |
| 1502 | kaddr = kmap_atomic(page, KM_USER0); |
| 1503 | memcpy(kaddr, symname, pathlen); |
| 1504 | if (pathlen < PAGE_SIZE) |
| 1505 | memset(kaddr + pathlen, 0, PAGE_SIZE - pathlen); |
| 1506 | kunmap_atomic(kaddr, KM_USER0); |
| 1507 | |
Chuck Lever | 94a6d75 | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1508 | error = NFS_PROTO(dir)->symlink(dir, dentry, page, pathlen, &attr); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1509 | if (error != 0) { |
| 1510 | dfprintk(VFS, "NFS: symlink(%s/%ld, %s, %s) error %d\n", |
| 1511 | dir->i_sb->s_id, dir->i_ino, |
| 1512 | dentry->d_name.name, symname, error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1513 | d_drop(dentry); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1514 | __free_page(page); |
| 1515 | unlock_kernel(); |
| 1516 | return error; |
| 1517 | } |
| 1518 | |
| 1519 | /* |
| 1520 | * No big deal if we can't add this page to the page cache here. |
| 1521 | * READLINK will get the missing page from the server if needed. |
| 1522 | */ |
| 1523 | pagevec_init(&lru_pvec, 0); |
| 1524 | if (!add_to_page_cache(page, dentry->d_inode->i_mapping, 0, |
| 1525 | GFP_KERNEL)) { |
Chuck Lever | 39cf8a1 | 2006-10-19 23:28:41 -0700 | [diff] [blame] | 1526 | pagevec_add(&lru_pvec, page); |
| 1527 | pagevec_lru_add(&lru_pvec); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1528 | SetPageUptodate(page); |
| 1529 | unlock_page(page); |
| 1530 | } else |
| 1531 | __free_page(page); |
| 1532 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1533 | unlock_kernel(); |
Chuck Lever | 873101b | 2006-08-22 20:06:23 -0400 | [diff] [blame] | 1534 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1535 | } |
| 1536 | |
| 1537 | static int |
| 1538 | nfs_link(struct dentry *old_dentry, struct inode *dir, struct dentry *dentry) |
| 1539 | { |
| 1540 | struct inode *inode = old_dentry->d_inode; |
| 1541 | int error; |
| 1542 | |
| 1543 | dfprintk(VFS, "NFS: link(%s/%s -> %s/%s)\n", |
| 1544 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, |
| 1545 | dentry->d_parent->d_name.name, dentry->d_name.name); |
| 1546 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1547 | lock_kernel(); |
Trond Myklebust | 9697d23 | 2007-10-02 21:58:05 -0400 | [diff] [blame] | 1548 | d_drop(dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | error = NFS_PROTO(dir)->link(inode, dir, &dentry->d_name); |
Trond Myklebust | cf80955 | 2005-10-27 22:12:42 -0400 | [diff] [blame] | 1550 | if (error == 0) { |
| 1551 | atomic_inc(&inode->i_count); |
Trond Myklebust | 9697d23 | 2007-10-02 21:58:05 -0400 | [diff] [blame] | 1552 | d_add(dentry, inode); |
Trond Myklebust | cf80955 | 2005-10-27 22:12:42 -0400 | [diff] [blame] | 1553 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1554 | unlock_kernel(); |
| 1555 | return error; |
| 1556 | } |
| 1557 | |
| 1558 | /* |
| 1559 | * RENAME |
| 1560 | * FIXME: Some nfsds, like the Linux user space nfsd, may generate a |
| 1561 | * different file handle for the same inode after a rename (e.g. when |
| 1562 | * moving to a different directory). A fail-safe method to do so would |
| 1563 | * be to look up old_dir/old_name, create a link to new_dir/new_name and |
| 1564 | * rename the old file using the sillyrename stuff. This way, the original |
| 1565 | * file in old_dir will go away when the last process iput()s the inode. |
| 1566 | * |
| 1567 | * FIXED. |
| 1568 | * |
| 1569 | * It actually works quite well. One needs to have the possibility for |
| 1570 | * at least one ".nfs..." file in each directory the file ever gets |
| 1571 | * moved or linked to which happens automagically with the new |
| 1572 | * implementation that only depends on the dcache stuff instead of |
| 1573 | * using the inode layer |
| 1574 | * |
| 1575 | * Unfortunately, things are a little more complicated than indicated |
| 1576 | * above. For a cross-directory move, we want to make sure we can get |
| 1577 | * rid of the old inode after the operation. This means there must be |
| 1578 | * no pending writes (if it's a file), and the use count must be 1. |
| 1579 | * If these conditions are met, we can drop the dentries before doing |
| 1580 | * the rename. |
| 1581 | */ |
| 1582 | static int nfs_rename(struct inode *old_dir, struct dentry *old_dentry, |
| 1583 | struct inode *new_dir, struct dentry *new_dentry) |
| 1584 | { |
| 1585 | struct inode *old_inode = old_dentry->d_inode; |
| 1586 | struct inode *new_inode = new_dentry->d_inode; |
| 1587 | struct dentry *dentry = NULL, *rehash = NULL; |
| 1588 | int error = -EBUSY; |
| 1589 | |
| 1590 | /* |
| 1591 | * To prevent any new references to the target during the rename, |
| 1592 | * we unhash the dentry and free the inode in advance. |
| 1593 | */ |
| 1594 | lock_kernel(); |
| 1595 | if (!d_unhashed(new_dentry)) { |
| 1596 | d_drop(new_dentry); |
| 1597 | rehash = new_dentry; |
| 1598 | } |
| 1599 | |
| 1600 | dfprintk(VFS, "NFS: rename(%s/%s -> %s/%s, ct=%d)\n", |
| 1601 | old_dentry->d_parent->d_name.name, old_dentry->d_name.name, |
| 1602 | new_dentry->d_parent->d_name.name, new_dentry->d_name.name, |
| 1603 | atomic_read(&new_dentry->d_count)); |
| 1604 | |
| 1605 | /* |
| 1606 | * First check whether the target is busy ... we can't |
| 1607 | * safely do _any_ rename if the target is in use. |
| 1608 | * |
| 1609 | * For files, make a copy of the dentry and then do a |
| 1610 | * silly-rename. If the silly-rename succeeds, the |
| 1611 | * copied dentry is hashed and becomes the new target. |
| 1612 | */ |
| 1613 | if (!new_inode) |
| 1614 | goto go_ahead; |
Trond Myklebust | 6fe43f9 | 2005-10-18 14:20:22 -0700 | [diff] [blame] | 1615 | if (S_ISDIR(new_inode->i_mode)) { |
| 1616 | error = -EISDIR; |
| 1617 | if (!S_ISDIR(old_inode->i_mode)) |
| 1618 | goto out; |
| 1619 | } else if (atomic_read(&new_dentry->d_count) > 2) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1620 | int err; |
| 1621 | /* copy the target dentry's name */ |
| 1622 | dentry = d_alloc(new_dentry->d_parent, |
| 1623 | &new_dentry->d_name); |
| 1624 | if (!dentry) |
| 1625 | goto out; |
| 1626 | |
| 1627 | /* silly-rename the existing target ... */ |
| 1628 | err = nfs_sillyrename(new_dir, new_dentry); |
| 1629 | if (!err) { |
| 1630 | new_dentry = rehash = dentry; |
| 1631 | new_inode = NULL; |
| 1632 | /* instantiate the replacement target */ |
| 1633 | d_instantiate(new_dentry, NULL); |
Jesper Juhl | 7a13e93 | 2007-04-26 00:29:02 -0700 | [diff] [blame] | 1634 | } else if (atomic_read(&new_dentry->d_count) > 1) |
| 1635 | /* dentry still busy? */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1636 | goto out; |
Trond Myklebust | 20509f1 | 2005-08-25 16:25:34 -0700 | [diff] [blame] | 1637 | } else |
Dave Hansen | 9a53c3a | 2006-09-30 23:29:03 -0700 | [diff] [blame] | 1638 | drop_nlink(new_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1639 | |
| 1640 | go_ahead: |
| 1641 | /* |
| 1642 | * ... prune child dentries and writebacks if needed. |
| 1643 | */ |
| 1644 | if (atomic_read(&old_dentry->d_count) > 1) { |
Trond Myklebust | e1552e1 | 2007-04-14 19:07:28 -0400 | [diff] [blame] | 1645 | if (S_ISREG(old_inode->i_mode)) |
| 1646 | nfs_wb_all(old_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1647 | shrink_dcache_parent(old_dentry); |
| 1648 | } |
Trond Myklebust | cae7a07 | 2005-10-18 14:20:19 -0700 | [diff] [blame] | 1649 | nfs_inode_return_delegation(old_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1650 | |
Trond Myklebust | 2417411 | 2006-01-03 09:55:33 +0100 | [diff] [blame] | 1651 | if (new_inode != NULL) { |
| 1652 | nfs_inode_return_delegation(new_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1653 | d_delete(new_dentry); |
Trond Myklebust | 2417411 | 2006-01-03 09:55:33 +0100 | [diff] [blame] | 1654 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1655 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1656 | error = NFS_PROTO(old_dir)->rename(old_dir, &old_dentry->d_name, |
| 1657 | new_dir, &new_dentry->d_name); |
Trond Myklebust | 5ba7cc4 | 2005-12-03 15:20:17 -0500 | [diff] [blame] | 1658 | nfs_mark_for_revalidate(old_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1659 | out: |
| 1660 | if (rehash) |
| 1661 | d_rehash(rehash); |
| 1662 | if (!error) { |
Mark Fasheh | 349457c | 2006-09-08 14:22:21 -0700 | [diff] [blame] | 1663 | d_move(old_dentry, new_dentry); |
Chuck Lever | 8fb559f | 2007-09-24 15:40:16 -0400 | [diff] [blame] | 1664 | nfs_set_verifier(new_dentry, |
| 1665 | nfs_save_change_attribute(new_dir)); |
Trond Myklebust | d45b9d8 | 2008-01-28 19:43:18 -0500 | [diff] [blame] | 1666 | } else if (error == -ENOENT) |
| 1667 | nfs_dentry_handle_enoent(old_dentry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1668 | |
| 1669 | /* new dentry created? */ |
| 1670 | if (dentry) |
| 1671 | dput(dentry); |
| 1672 | unlock_kernel(); |
| 1673 | return error; |
| 1674 | } |
| 1675 | |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1676 | static DEFINE_SPINLOCK(nfs_access_lru_lock); |
| 1677 | static LIST_HEAD(nfs_access_lru_list); |
| 1678 | static atomic_long_t nfs_access_nr_entries; |
| 1679 | |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1680 | static void nfs_access_free_entry(struct nfs_access_entry *entry) |
| 1681 | { |
| 1682 | put_rpccred(entry->cred); |
| 1683 | kfree(entry); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1684 | smp_mb__before_atomic_dec(); |
| 1685 | atomic_long_dec(&nfs_access_nr_entries); |
| 1686 | smp_mb__after_atomic_dec(); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1687 | } |
| 1688 | |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1689 | int nfs_access_cache_shrinker(int nr_to_scan, gfp_t gfp_mask) |
| 1690 | { |
| 1691 | LIST_HEAD(head); |
| 1692 | struct nfs_inode *nfsi; |
| 1693 | struct nfs_access_entry *cache; |
| 1694 | |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1695 | restart: |
Trond Myklebust | a50f795 | 2007-06-05 19:23:43 -0400 | [diff] [blame] | 1696 | spin_lock(&nfs_access_lru_lock); |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1697 | list_for_each_entry(nfsi, &nfs_access_lru_list, access_cache_inode_lru) { |
| 1698 | struct inode *inode; |
| 1699 | |
| 1700 | if (nr_to_scan-- == 0) |
| 1701 | break; |
| 1702 | inode = igrab(&nfsi->vfs_inode); |
| 1703 | if (inode == NULL) |
| 1704 | continue; |
| 1705 | spin_lock(&inode->i_lock); |
| 1706 | if (list_empty(&nfsi->access_cache_entry_lru)) |
| 1707 | goto remove_lru_entry; |
| 1708 | cache = list_entry(nfsi->access_cache_entry_lru.next, |
| 1709 | struct nfs_access_entry, lru); |
| 1710 | list_move(&cache->lru, &head); |
| 1711 | rb_erase(&cache->rb_node, &nfsi->access_cache); |
| 1712 | if (!list_empty(&nfsi->access_cache_entry_lru)) |
| 1713 | list_move_tail(&nfsi->access_cache_inode_lru, |
| 1714 | &nfs_access_lru_list); |
| 1715 | else { |
| 1716 | remove_lru_entry: |
| 1717 | list_del_init(&nfsi->access_cache_inode_lru); |
| 1718 | clear_bit(NFS_INO_ACL_LRU_SET, &nfsi->flags); |
| 1719 | } |
| 1720 | spin_unlock(&inode->i_lock); |
Trond Myklebust | a50f795 | 2007-06-05 19:23:43 -0400 | [diff] [blame] | 1721 | spin_unlock(&nfs_access_lru_lock); |
Trond Myklebust | 979df72 | 2006-07-25 11:28:19 -0400 | [diff] [blame] | 1722 | iput(inode); |
| 1723 | goto restart; |
| 1724 | } |
| 1725 | spin_unlock(&nfs_access_lru_lock); |
| 1726 | while (!list_empty(&head)) { |
| 1727 | cache = list_entry(head.next, struct nfs_access_entry, lru); |
| 1728 | list_del(&cache->lru); |
| 1729 | nfs_access_free_entry(cache); |
| 1730 | } |
| 1731 | return (atomic_long_read(&nfs_access_nr_entries) / 100) * sysctl_vfs_cache_pressure; |
| 1732 | } |
| 1733 | |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1734 | static void __nfs_access_zap_cache(struct inode *inode) |
| 1735 | { |
| 1736 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1737 | struct rb_root *root_node = &nfsi->access_cache; |
| 1738 | struct rb_node *n, *dispose = NULL; |
| 1739 | struct nfs_access_entry *entry; |
| 1740 | |
| 1741 | /* Unhook entries from the cache */ |
| 1742 | while ((n = rb_first(root_node)) != NULL) { |
| 1743 | entry = rb_entry(n, struct nfs_access_entry, rb_node); |
| 1744 | rb_erase(n, root_node); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1745 | list_del(&entry->lru); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1746 | n->rb_left = dispose; |
| 1747 | dispose = n; |
| 1748 | } |
| 1749 | nfsi->cache_validity &= ~NFS_INO_INVALID_ACCESS; |
| 1750 | spin_unlock(&inode->i_lock); |
| 1751 | |
| 1752 | /* Now kill them all! */ |
| 1753 | while (dispose != NULL) { |
| 1754 | n = dispose; |
| 1755 | dispose = n->rb_left; |
| 1756 | nfs_access_free_entry(rb_entry(n, struct nfs_access_entry, rb_node)); |
| 1757 | } |
| 1758 | } |
| 1759 | |
| 1760 | void nfs_access_zap_cache(struct inode *inode) |
| 1761 | { |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1762 | /* Remove from global LRU init */ |
| 1763 | if (test_and_clear_bit(NFS_INO_ACL_LRU_SET, &NFS_FLAGS(inode))) { |
| 1764 | spin_lock(&nfs_access_lru_lock); |
| 1765 | list_del_init(&NFS_I(inode)->access_cache_inode_lru); |
| 1766 | spin_unlock(&nfs_access_lru_lock); |
| 1767 | } |
| 1768 | |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1769 | spin_lock(&inode->i_lock); |
| 1770 | /* This will release the spinlock */ |
| 1771 | __nfs_access_zap_cache(inode); |
| 1772 | } |
| 1773 | |
| 1774 | static struct nfs_access_entry *nfs_access_search_rbtree(struct inode *inode, struct rpc_cred *cred) |
| 1775 | { |
| 1776 | struct rb_node *n = NFS_I(inode)->access_cache.rb_node; |
| 1777 | struct nfs_access_entry *entry; |
| 1778 | |
| 1779 | while (n != NULL) { |
| 1780 | entry = rb_entry(n, struct nfs_access_entry, rb_node); |
| 1781 | |
| 1782 | if (cred < entry->cred) |
| 1783 | n = n->rb_left; |
| 1784 | else if (cred > entry->cred) |
| 1785 | n = n->rb_right; |
| 1786 | else |
| 1787 | return entry; |
| 1788 | } |
| 1789 | return NULL; |
| 1790 | } |
| 1791 | |
Trond Myklebust | af22f94 | 2007-08-10 17:45:10 -0400 | [diff] [blame] | 1792 | static int nfs_access_get_cached(struct inode *inode, struct rpc_cred *cred, struct nfs_access_entry *res) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1793 | { |
Chuck Lever | 5529680 | 2005-08-18 11:24:09 -0700 | [diff] [blame] | 1794 | struct nfs_inode *nfsi = NFS_I(inode); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1795 | struct nfs_access_entry *cache; |
| 1796 | int err = -ENOENT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1797 | |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1798 | spin_lock(&inode->i_lock); |
| 1799 | if (nfsi->cache_validity & NFS_INO_INVALID_ACCESS) |
| 1800 | goto out_zap; |
| 1801 | cache = nfs_access_search_rbtree(inode, cred); |
| 1802 | if (cache == NULL) |
| 1803 | goto out; |
Trond Myklebust | c7c2097 | 2007-09-28 19:22:40 -0400 | [diff] [blame] | 1804 | if (!time_in_range(jiffies, cache->jiffies, cache->jiffies + nfsi->attrtimeo)) |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1805 | goto out_stale; |
| 1806 | res->jiffies = cache->jiffies; |
| 1807 | res->cred = cache->cred; |
| 1808 | res->mask = cache->mask; |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1809 | list_move_tail(&cache->lru, &nfsi->access_cache_entry_lru); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1810 | err = 0; |
| 1811 | out: |
| 1812 | spin_unlock(&inode->i_lock); |
| 1813 | return err; |
| 1814 | out_stale: |
| 1815 | rb_erase(&cache->rb_node, &nfsi->access_cache); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1816 | list_del(&cache->lru); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1817 | spin_unlock(&inode->i_lock); |
| 1818 | nfs_access_free_entry(cache); |
| 1819 | return -ENOENT; |
| 1820 | out_zap: |
| 1821 | /* This will release the spinlock */ |
| 1822 | __nfs_access_zap_cache(inode); |
| 1823 | return -ENOENT; |
| 1824 | } |
| 1825 | |
| 1826 | static void nfs_access_add_rbtree(struct inode *inode, struct nfs_access_entry *set) |
| 1827 | { |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1828 | struct nfs_inode *nfsi = NFS_I(inode); |
| 1829 | struct rb_root *root_node = &nfsi->access_cache; |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1830 | struct rb_node **p = &root_node->rb_node; |
| 1831 | struct rb_node *parent = NULL; |
| 1832 | struct nfs_access_entry *entry; |
| 1833 | |
| 1834 | spin_lock(&inode->i_lock); |
| 1835 | while (*p != NULL) { |
| 1836 | parent = *p; |
| 1837 | entry = rb_entry(parent, struct nfs_access_entry, rb_node); |
| 1838 | |
| 1839 | if (set->cred < entry->cred) |
| 1840 | p = &parent->rb_left; |
| 1841 | else if (set->cred > entry->cred) |
| 1842 | p = &parent->rb_right; |
| 1843 | else |
| 1844 | goto found; |
| 1845 | } |
| 1846 | rb_link_node(&set->rb_node, parent, p); |
| 1847 | rb_insert_color(&set->rb_node, root_node); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1848 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1849 | spin_unlock(&inode->i_lock); |
| 1850 | return; |
| 1851 | found: |
| 1852 | rb_replace_node(parent, &set->rb_node, root_node); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1853 | list_add_tail(&set->lru, &nfsi->access_cache_entry_lru); |
| 1854 | list_del(&entry->lru); |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1855 | spin_unlock(&inode->i_lock); |
| 1856 | nfs_access_free_entry(entry); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1857 | } |
| 1858 | |
Trond Myklebust | af22f94 | 2007-08-10 17:45:10 -0400 | [diff] [blame] | 1859 | static void nfs_access_add_cache(struct inode *inode, struct nfs_access_entry *set) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1860 | { |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1861 | struct nfs_access_entry *cache = kmalloc(sizeof(*cache), GFP_KERNEL); |
| 1862 | if (cache == NULL) |
| 1863 | return; |
| 1864 | RB_CLEAR_NODE(&cache->rb_node); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1865 | cache->jiffies = set->jiffies; |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1866 | cache->cred = get_rpccred(set->cred); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1867 | cache->mask = set->mask; |
Trond Myklebust | 1c3c07e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1868 | |
| 1869 | nfs_access_add_rbtree(inode, cache); |
Trond Myklebust | cfcea3e | 2006-07-25 11:28:18 -0400 | [diff] [blame] | 1870 | |
| 1871 | /* Update accounting */ |
| 1872 | smp_mb__before_atomic_inc(); |
| 1873 | atomic_long_inc(&nfs_access_nr_entries); |
| 1874 | smp_mb__after_atomic_inc(); |
| 1875 | |
| 1876 | /* Add inode to global LRU list */ |
| 1877 | if (!test_and_set_bit(NFS_INO_ACL_LRU_SET, &NFS_FLAGS(inode))) { |
| 1878 | spin_lock(&nfs_access_lru_lock); |
| 1879 | list_add_tail(&NFS_I(inode)->access_cache_inode_lru, &nfs_access_lru_list); |
| 1880 | spin_unlock(&nfs_access_lru_lock); |
| 1881 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1882 | } |
| 1883 | |
| 1884 | static int nfs_do_access(struct inode *inode, struct rpc_cred *cred, int mask) |
| 1885 | { |
| 1886 | struct nfs_access_entry cache; |
| 1887 | int status; |
| 1888 | |
| 1889 | status = nfs_access_get_cached(inode, cred, &cache); |
| 1890 | if (status == 0) |
| 1891 | goto out; |
| 1892 | |
| 1893 | /* Be clever: ask server to check for all possible rights */ |
| 1894 | cache.mask = MAY_EXEC | MAY_WRITE | MAY_READ; |
| 1895 | cache.cred = cred; |
| 1896 | cache.jiffies = jiffies; |
| 1897 | status = NFS_PROTO(inode)->access(inode, &cache); |
| 1898 | if (status != 0) |
| 1899 | return status; |
| 1900 | nfs_access_add_cache(inode, &cache); |
| 1901 | out: |
| 1902 | if ((cache.mask & mask) == mask) |
| 1903 | return 0; |
| 1904 | return -EACCES; |
| 1905 | } |
| 1906 | |
Trond Myklebust | af22f94 | 2007-08-10 17:45:10 -0400 | [diff] [blame] | 1907 | static int nfs_open_permission_mask(int openflags) |
| 1908 | { |
| 1909 | int mask = 0; |
| 1910 | |
| 1911 | if (openflags & FMODE_READ) |
| 1912 | mask |= MAY_READ; |
| 1913 | if (openflags & FMODE_WRITE) |
| 1914 | mask |= MAY_WRITE; |
| 1915 | if (openflags & FMODE_EXEC) |
| 1916 | mask |= MAY_EXEC; |
| 1917 | return mask; |
| 1918 | } |
| 1919 | |
| 1920 | int nfs_may_open(struct inode *inode, struct rpc_cred *cred, int openflags) |
| 1921 | { |
| 1922 | return nfs_do_access(inode, cred, nfs_open_permission_mask(openflags)); |
| 1923 | } |
| 1924 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1925 | int nfs_permission(struct inode *inode, int mask, struct nameidata *nd) |
| 1926 | { |
| 1927 | struct rpc_cred *cred; |
| 1928 | int res = 0; |
| 1929 | |
Chuck Lever | 91d5b47 | 2006-03-20 13:44:14 -0500 | [diff] [blame] | 1930 | nfs_inc_stats(inode, NFSIOS_VFSACCESS); |
| 1931 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1932 | if (mask == 0) |
| 1933 | goto out; |
| 1934 | /* Is this sys_access() ? */ |
| 1935 | if (nd != NULL && (nd->flags & LOOKUP_ACCESS)) |
| 1936 | goto force_lookup; |
| 1937 | |
| 1938 | switch (inode->i_mode & S_IFMT) { |
| 1939 | case S_IFLNK: |
| 1940 | goto out; |
| 1941 | case S_IFREG: |
| 1942 | /* NFSv4 has atomic_open... */ |
| 1943 | if (nfs_server_capable(inode, NFS_CAP_ATOMIC_OPEN) |
| 1944 | && nd != NULL |
| 1945 | && (nd->flags & LOOKUP_OPEN)) |
| 1946 | goto out; |
| 1947 | break; |
| 1948 | case S_IFDIR: |
| 1949 | /* |
| 1950 | * Optimize away all write operations, since the server |
| 1951 | * will check permissions when we perform the op. |
| 1952 | */ |
| 1953 | if ((mask & MAY_WRITE) && !(mask & MAY_READ)) |
| 1954 | goto out; |
| 1955 | } |
| 1956 | |
| 1957 | force_lookup: |
| 1958 | lock_kernel(); |
| 1959 | |
| 1960 | if (!NFS_PROTO(inode)->access) |
| 1961 | goto out_notsup; |
| 1962 | |
| 1963 | cred = rpcauth_lookupcred(NFS_CLIENT(inode)->cl_auth, 0); |
| 1964 | if (!IS_ERR(cred)) { |
| 1965 | res = nfs_do_access(inode, cred, mask); |
| 1966 | put_rpccred(cred); |
| 1967 | } else |
| 1968 | res = PTR_ERR(cred); |
| 1969 | unlock_kernel(); |
| 1970 | out: |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1971 | dfprintk(VFS, "NFS: permission(%s/%ld), mask=0x%x, res=%d\n", |
| 1972 | inode->i_sb->s_id, inode->i_ino, mask, res); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1973 | return res; |
| 1974 | out_notsup: |
| 1975 | res = nfs_revalidate_inode(NFS_SERVER(inode), inode); |
| 1976 | if (res == 0) |
| 1977 | res = generic_permission(inode, mask, NULL); |
| 1978 | unlock_kernel(); |
Chuck Lever | 1e7cb3d | 2006-03-20 13:44:24 -0500 | [diff] [blame] | 1979 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1980 | } |
| 1981 | |
| 1982 | /* |
| 1983 | * Local variables: |
| 1984 | * version-control: t |
| 1985 | * kept-new-versions: 5 |
| 1986 | * End: |
| 1987 | */ |