Blame view
fs/afs/inode.c
12.2 KB
1da177e4c Linux-2.6.12-rc2 |
1 2 3 4 5 6 7 8 9 10 |
/* * Copyright (c) 2002 Red Hat, Inc. All rights reserved. * * This software may be freely redistributed under the terms of the * GNU General Public License. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. * |
44d1b980c Fix various old e... |
11 |
* Authors: David Woodhouse <dwmw2@infradead.org> |
1da177e4c Linux-2.6.12-rc2 |
12 13 14 15 16 17 18 |
* David Howells <dhowells@redhat.com> * */ #include <linux/kernel.h> #include <linux/module.h> #include <linux/init.h> |
1da177e4c Linux-2.6.12-rc2 |
19 20 |
#include <linux/fs.h> #include <linux/pagemap.h> |
e8edc6e03 Detach sched.h fr... |
21 |
#include <linux/sched.h> |
bec5eb614 AFS: Implement an... |
22 23 |
#include <linux/mount.h> #include <linux/namei.h> |
1da177e4c Linux-2.6.12-rc2 |
24 25 26 27 28 29 |
#include "internal.h" struct afs_iget_data { struct afs_fid fid; struct afs_volume *volume; /* volume on which resides */ }; |
1da177e4c Linux-2.6.12-rc2 |
30 31 32 |
/* * map the AFS file status to the inode member variables */ |
00d3b7a45 [AFS]: Add securi... |
33 |
static int afs_inode_map_status(struct afs_vnode *vnode, struct key *key) |
1da177e4c Linux-2.6.12-rc2 |
34 35 |
{ struct inode *inode = AFS_VNODE_TO_I(vnode); |
260a98031 [AFS]: Add "direc... |
36 |
_debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu", |
1da177e4c Linux-2.6.12-rc2 |
37 38 |
vnode->status.type, vnode->status.nlink, |
ba3e0e1ac [AFS]: Fix u64 pr... |
39 |
(unsigned long long) vnode->status.size, |
08e0e7c82 [AF_RXRPC]: Make ... |
40 |
vnode->status.data_version, |
1da177e4c Linux-2.6.12-rc2 |
41 42 43 44 45 46 |
vnode->status.mode); switch (vnode->status.type) { case AFS_FTYPE_FILE: inode->i_mode = S_IFREG | vnode->status.mode; inode->i_op = &afs_file_inode_operations; |
00d3b7a45 [AFS]: Add securi... |
47 |
inode->i_fop = &afs_file_operations; |
1da177e4c Linux-2.6.12-rc2 |
48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 |
break; case AFS_FTYPE_DIR: inode->i_mode = S_IFDIR | vnode->status.mode; inode->i_op = &afs_dir_inode_operations; inode->i_fop = &afs_dir_file_operations; break; case AFS_FTYPE_SYMLINK: inode->i_mode = S_IFLNK | vnode->status.mode; inode->i_op = &page_symlink_inode_operations; break; default: printk("kAFS: AFS vnode with undefined type "); return -EBADMSG; } |
9b3f26c91 FS-Cache: Make kA... |
63 64 65 66 |
#ifdef CONFIG_AFS_FSCACHE if (vnode->status.size != inode->i_size) fscache_attr_changed(vnode->cache); #endif |
bfe868486 filesystems: add ... |
67 |
set_nlink(inode, vnode->status.nlink); |
1da177e4c Linux-2.6.12-rc2 |
68 69 70 71 72 73 |
inode->i_uid = vnode->status.owner; inode->i_gid = 0; inode->i_size = vnode->status.size; inode->i_ctime.tv_sec = vnode->status.mtime_server; inode->i_ctime.tv_nsec = 0; inode->i_atime = inode->i_mtime = inode->i_ctime; |
1da177e4c Linux-2.6.12-rc2 |
74 |
inode->i_blocks = 0; |
d6e43f751 AFS: Use i_genera... |
75 76 |
inode->i_generation = vnode->fid.unique; inode->i_version = vnode->status.data_version; |
1da177e4c Linux-2.6.12-rc2 |
77 78 79 80 |
inode->i_mapping->a_ops = &afs_fs_aops; /* check to see whether a symbolic link is really a mountpoint */ if (vnode->status.type == AFS_FTYPE_SYMLINK) { |
00d3b7a45 [AFS]: Add securi... |
81 |
afs_mntpt_check_symlink(vnode, key); |
1da177e4c Linux-2.6.12-rc2 |
82 |
|
08e0e7c82 [AF_RXRPC]: Make ... |
83 |
if (test_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags)) { |
1da177e4c Linux-2.6.12-rc2 |
84 85 86 87 88 89 90 |
inode->i_mode = S_IFDIR | vnode->status.mode; inode->i_op = &afs_mntpt_inode_operations; inode->i_fop = &afs_mntpt_file_operations; } } return 0; |
ec26815ad [AFS]: Clean up t... |
91 |
} |
1da177e4c Linux-2.6.12-rc2 |
92 |
|
1da177e4c Linux-2.6.12-rc2 |
93 |
/* |
1da177e4c Linux-2.6.12-rc2 |
94 95 96 97 98 99 100 |
* iget5() comparator */ static int afs_iget5_test(struct inode *inode, void *opaque) { struct afs_iget_data *data = opaque; return inode->i_ino == data->fid.vnode && |
d6e43f751 AFS: Use i_genera... |
101 |
inode->i_generation == data->fid.unique; |
ec26815ad [AFS]: Clean up t... |
102 |
} |
1da177e4c Linux-2.6.12-rc2 |
103 |
|
1da177e4c Linux-2.6.12-rc2 |
104 |
/* |
bec5eb614 AFS: Implement an... |
105 106 107 108 109 110 111 112 113 114 |
* iget5() comparator for inode created by autocell operations * * These pseudo inodes don't match anything. */ static int afs_iget5_autocell_test(struct inode *inode, void *opaque) { return 0; } /* |
1da177e4c Linux-2.6.12-rc2 |
115 116 117 118 119 120 121 122 |
* iget5() inode initialiser */ static int afs_iget5_set(struct inode *inode, void *opaque) { struct afs_iget_data *data = opaque; struct afs_vnode *vnode = AFS_FS_I(inode); inode->i_ino = data->fid.vnode; |
d6e43f751 AFS: Use i_genera... |
123 |
inode->i_generation = data->fid.unique; |
1da177e4c Linux-2.6.12-rc2 |
124 125 126 127 |
vnode->fid = data->fid; vnode->volume = data->volume; return 0; |
ec26815ad [AFS]: Clean up t... |
128 |
} |
1da177e4c Linux-2.6.12-rc2 |
129 |
|
1da177e4c Linux-2.6.12-rc2 |
130 |
/* |
bec5eb614 AFS: Implement an... |
131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 |
* inode retrieval for autocell */ struct inode *afs_iget_autocell(struct inode *dir, const char *dev_name, int namesz, struct key *key) { struct afs_iget_data data; struct afs_super_info *as; struct afs_vnode *vnode; struct super_block *sb; struct inode *inode; static atomic_t afs_autocell_ino; _enter("{%x:%u},%*.*s,", AFS_FS_I(dir)->fid.vid, AFS_FS_I(dir)->fid.vnode, namesz, namesz, dev_name ?: ""); sb = dir->i_sb; as = sb->s_fs_info; data.volume = as->volume; data.fid.vid = as->volume->vid; data.fid.unique = 0; data.fid.vnode = 0; inode = iget5_locked(sb, atomic_inc_return(&afs_autocell_ino), afs_iget5_autocell_test, afs_iget5_set, &data); if (!inode) { _leave(" = -ENOMEM"); return ERR_PTR(-ENOMEM); } _debug("GOT INODE %p { ino=%lu, vl=%x, vn=%x, u=%x }", inode, inode->i_ino, data.fid.vid, data.fid.vnode, data.fid.unique); vnode = AFS_FS_I(inode); /* there shouldn't be an existing inode */ BUG_ON(!(inode->i_state & I_NEW)); inode->i_size = 0; inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; inode->i_op = &afs_autocell_inode_operations; |
bfe868486 filesystems: add ... |
174 |
set_nlink(inode, 2); |
bec5eb614 AFS: Implement an... |
175 176 177 178 179 180 181 182 183 184 |
inode->i_uid = 0; inode->i_gid = 0; inode->i_ctime.tv_sec = get_seconds(); inode->i_ctime.tv_nsec = 0; inode->i_atime = inode->i_mtime = inode->i_ctime; inode->i_blocks = 0; inode->i_version = 0; inode->i_generation = 0; set_bit(AFS_VNODE_PSEUDODIR, &vnode->flags); |
d18610b0c AFS: Use d_automo... |
185 186 |
set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags); inode->i_flags |= S_AUTOMOUNT | S_NOATIME; |
bec5eb614 AFS: Implement an... |
187 188 189 190 191 192 |
unlock_new_inode(inode); _leave(" = %p", inode); return inode; } /* |
1da177e4c Linux-2.6.12-rc2 |
193 194 |
* inode retrieval */ |
260a98031 [AFS]: Add "direc... |
195 196 197 |
struct inode *afs_iget(struct super_block *sb, struct key *key, struct afs_fid *fid, struct afs_file_status *status, struct afs_callback *cb) |
1da177e4c Linux-2.6.12-rc2 |
198 199 200 201 202 203 |
{ struct afs_iget_data data = { .fid = *fid }; struct afs_super_info *as; struct afs_vnode *vnode; struct inode *inode; int ret; |
416351f28 AFS: AFS fixups |
204 |
_enter(",{%x:%u.%u},,", fid->vid, fid->vnode, fid->unique); |
1da177e4c Linux-2.6.12-rc2 |
205 206 207 208 209 210 211 212 |
as = sb->s_fs_info; data.volume = as->volume; inode = iget5_locked(sb, fid->vnode, afs_iget5_test, afs_iget5_set, &data); if (!inode) { _leave(" = -ENOMEM"); |
08e0e7c82 [AF_RXRPC]: Make ... |
213 |
return ERR_PTR(-ENOMEM); |
1da177e4c Linux-2.6.12-rc2 |
214 |
} |
08e0e7c82 [AF_RXRPC]: Make ... |
215 216 |
_debug("GOT INODE %p { vl=%x vn=%x, u=%x }", inode, fid->vid, fid->vnode, fid->unique); |
1da177e4c Linux-2.6.12-rc2 |
217 218 219 220 |
vnode = AFS_FS_I(inode); /* deal with an existing inode */ if (!(inode->i_state & I_NEW)) { |
08e0e7c82 [AF_RXRPC]: Make ... |
221 222 |
_leave(" = %p", inode); return inode; |
1da177e4c Linux-2.6.12-rc2 |
223 |
} |
260a98031 [AFS]: Add "direc... |
224 225 226 227 228 229 230 231 232 233 234 235 236 237 238 239 240 241 242 243 244 245 246 247 |
if (!status) { /* it's a remotely extant inode */ set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); ret = afs_vnode_fetch_status(vnode, NULL, key); if (ret < 0) goto bad_inode; } else { /* it's an inode we just created */ memcpy(&vnode->status, status, sizeof(vnode->status)); if (!cb) { /* it's a symlink we just created (the fileserver * didn't give us a callback) */ vnode->cb_version = 0; vnode->cb_expiry = 0; vnode->cb_type = 0; vnode->cb_expires = get_seconds(); } else { vnode->cb_version = cb->version; vnode->cb_expiry = cb->expiry; vnode->cb_type = cb->type; vnode->cb_expires = vnode->cb_expiry + get_seconds(); } } |
9b3f26c91 FS-Cache: Make kA... |
248 249 250 251 252 253 254 255 |
/* set up caching before mapping the status, as map-status reads the * first page of symlinks to see if they're really mountpoints */ inode->i_size = vnode->status.size; #ifdef CONFIG_AFS_FSCACHE vnode->cache = fscache_acquire_cookie(vnode->volume->cache, &afs_vnode_cache_index_def, vnode); #endif |
00d3b7a45 [AFS]: Add securi... |
256 |
ret = afs_inode_map_status(vnode, key); |
08e0e7c82 [AF_RXRPC]: Make ... |
257 |
if (ret < 0) |
1da177e4c Linux-2.6.12-rc2 |
258 259 260 |
goto bad_inode; /* success */ |
260a98031 [AFS]: Add "direc... |
261 |
clear_bit(AFS_VNODE_UNSET, &vnode->flags); |
08e0e7c82 [AF_RXRPC]: Make ... |
262 |
inode->i_flags |= S_NOATIME; |
1da177e4c Linux-2.6.12-rc2 |
263 |
unlock_new_inode(inode); |
08e0e7c82 [AF_RXRPC]: Make ... |
264 265 |
_leave(" = %p [CB { v=%u t=%u }]", inode, vnode->cb_version, vnode->cb_type); return inode; |
1da177e4c Linux-2.6.12-rc2 |
266 267 |
/* failure */ |
ec26815ad [AFS]: Clean up t... |
268 |
bad_inode: |
9b3f26c91 FS-Cache: Make kA... |
269 270 271 272 |
#ifdef CONFIG_AFS_FSCACHE fscache_relinquish_cookie(vnode->cache, 0); vnode->cache = NULL; #endif |
aa7fa240c iget: use iget_fa... |
273 |
iget_failed(inode); |
1da177e4c Linux-2.6.12-rc2 |
274 |
_leave(" = %d [bad]", ret); |
08e0e7c82 [AF_RXRPC]: Make ... |
275 |
return ERR_PTR(ret); |
ec26815ad [AFS]: Clean up t... |
276 |
} |
1da177e4c Linux-2.6.12-rc2 |
277 |
|
1da177e4c Linux-2.6.12-rc2 |
278 |
/* |
416351f28 AFS: AFS fixups |
279 280 281 282 283 |
* mark the data attached to an inode as obsolete due to a write on the server * - might also want to ditch all the outstanding writes and dirty pages */ void afs_zap_data(struct afs_vnode *vnode) { |
0f300ca92 AFS: fix a couple... |
284 |
_enter("{%x:%u}", vnode->fid.vid, vnode->fid.vnode); |
416351f28 AFS: AFS fixups |
285 286 |
/* nuke all the non-dirty pages that aren't locked, mapped or being |
0f300ca92 AFS: fix a couple... |
287 288 289 290 291 292 |
* written back in a regular file and completely discard the pages in a * directory or symlink */ if (S_ISREG(vnode->vfs_inode.i_mode)) invalidate_remote_inode(&vnode->vfs_inode); else invalidate_inode_pages2(vnode->vfs_inode.i_mapping); |
416351f28 AFS: AFS fixups |
293 294 295 |
} /* |
260a98031 [AFS]: Add "direc... |
296 297 298 299 300 301 302 303 304 305 306 307 308 309 310 311 312 313 314 315 316 317 318 319 320 321 322 323 324 325 326 327 328 329 330 331 332 333 334 335 336 337 338 339 340 341 342 343 344 345 346 347 348 349 |
* validate a vnode/inode * - there are several things we need to check * - parent dir data changes (rm, rmdir, rename, mkdir, create, link, * symlink) * - parent dir metadata changed (security changes) * - dentry data changed (write, truncate) * - dentry metadata changed (security changes) */ int afs_validate(struct afs_vnode *vnode, struct key *key) { int ret; _enter("{v={%x:%u} fl=%lx},%x", vnode->fid.vid, vnode->fid.vnode, vnode->flags, key_serial(key)); if (vnode->cb_promised && !test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags) && !test_bit(AFS_VNODE_MODIFIED, &vnode->flags) && !test_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) { if (vnode->cb_expires < get_seconds() + 10) { _debug("callback expired"); set_bit(AFS_VNODE_CB_BROKEN, &vnode->flags); } else { goto valid; } } if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) goto valid; mutex_lock(&vnode->validate_lock); /* if the promise has expired, we need to check the server again to get * a new promise - note that if the (parent) directory's metadata was * changed then the security may be different and we may no longer have * access */ if (!vnode->cb_promised || test_bit(AFS_VNODE_CB_BROKEN, &vnode->flags)) { _debug("not promised"); ret = afs_vnode_fetch_status(vnode, NULL, key); if (ret < 0) goto error_unlock; _debug("new promise [fl=%lx]", vnode->flags); } if (test_bit(AFS_VNODE_DELETED, &vnode->flags)) { _debug("file already deleted"); ret = -ESTALE; goto error_unlock; } /* if the vnode's data version number changed then its contents are * different */ |
416351f28 AFS: AFS fixups |
350 351 |
if (test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags)) afs_zap_data(vnode); |
260a98031 [AFS]: Add "direc... |
352 353 354 355 356 357 358 359 360 361 362 363 364 365 |
clear_bit(AFS_VNODE_MODIFIED, &vnode->flags); mutex_unlock(&vnode->validate_lock); valid: _leave(" = 0"); return 0; error_unlock: mutex_unlock(&vnode->validate_lock); _leave(" = %d", ret); return ret; } /* |
1da177e4c Linux-2.6.12-rc2 |
366 367 |
* read the attributes of an inode */ |
416351f28 AFS: AFS fixups |
368 |
int afs_getattr(struct vfsmount *mnt, struct dentry *dentry, |
1da177e4c Linux-2.6.12-rc2 |
369 370 |
struct kstat *stat) { |
1da177e4c Linux-2.6.12-rc2 |
371 |
struct inode *inode; |
1da177e4c Linux-2.6.12-rc2 |
372 373 |
inode = dentry->d_inode; |
d6e43f751 AFS: Use i_genera... |
374 |
_enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation); |
1da177e4c Linux-2.6.12-rc2 |
375 |
|
1da177e4c Linux-2.6.12-rc2 |
376 |
generic_fillattr(inode, stat); |
1da177e4c Linux-2.6.12-rc2 |
377 |
return 0; |
ec26815ad [AFS]: Clean up t... |
378 |
} |
1da177e4c Linux-2.6.12-rc2 |
379 |
|
1da177e4c Linux-2.6.12-rc2 |
380 |
/* |
bec5eb614 AFS: Implement an... |
381 382 383 384 385 386 387 388 389 390 391 392 393 |
* discard an AFS inode */ int afs_drop_inode(struct inode *inode) { _enter(""); if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags)) return generic_delete_inode(inode); else return generic_drop_inode(inode); } /* |
1da177e4c Linux-2.6.12-rc2 |
394 395 |
* clear an AFS inode */ |
b57922d97 convert remaining... |
396 |
void afs_evict_inode(struct inode *inode) |
1da177e4c Linux-2.6.12-rc2 |
397 |
{ |
00d3b7a45 [AFS]: Add securi... |
398 |
struct afs_permits *permits; |
1da177e4c Linux-2.6.12-rc2 |
399 400 401 |
struct afs_vnode *vnode; vnode = AFS_FS_I(inode); |
416351f28 AFS: AFS fixups |
402 |
_enter("{%x:%u.%d} v=%u x=%u t=%u }", |
260a98031 [AFS]: Add "direc... |
403 |
vnode->fid.vid, |
1da177e4c Linux-2.6.12-rc2 |
404 |
vnode->fid.vnode, |
260a98031 [AFS]: Add "direc... |
405 |
vnode->fid.unique, |
1da177e4c Linux-2.6.12-rc2 |
406 407 |
vnode->cb_version, vnode->cb_expiry, |
08e0e7c82 [AF_RXRPC]: Make ... |
408 |
vnode->cb_type); |
1da177e4c Linux-2.6.12-rc2 |
409 |
|
08e0e7c82 [AF_RXRPC]: Make ... |
410 411 412 |
_debug("CLEAR INODE %p", inode); ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode); |
b57922d97 convert remaining... |
413 414 |
truncate_inode_pages(&inode->i_data, 0); end_writeback(inode); |
08e0e7c82 [AF_RXRPC]: Make ... |
415 416 417 418 419 420 421 422 423 |
afs_give_up_callback(vnode); if (vnode->server) { spin_lock(&vnode->server->fs_lock); rb_erase(&vnode->server_rb, &vnode->server->fs_vnodes); spin_unlock(&vnode->server->fs_lock); afs_put_server(vnode->server); vnode->server = NULL; } |
1da177e4c Linux-2.6.12-rc2 |
424 |
|
31143d5d5 AFS: implement ba... |
425 |
ASSERT(list_empty(&vnode->writebacks)); |
08e0e7c82 [AF_RXRPC]: Make ... |
426 |
ASSERT(!vnode->cb_promised); |
1da177e4c Linux-2.6.12-rc2 |
427 |
|
9b3f26c91 FS-Cache: Make kA... |
428 429 |
#ifdef CONFIG_AFS_FSCACHE fscache_relinquish_cookie(vnode->cache, 0); |
1da177e4c Linux-2.6.12-rc2 |
430 431 |
vnode->cache = NULL; #endif |
00d3b7a45 [AFS]: Add securi... |
432 433 434 435 436 437 |
mutex_lock(&vnode->permits_lock); permits = vnode->permits; rcu_assign_pointer(vnode->permits, NULL); mutex_unlock(&vnode->permits_lock); if (permits) call_rcu(&permits->rcu, afs_zap_permits); |
1da177e4c Linux-2.6.12-rc2 |
438 |
_leave(""); |
ec26815ad [AFS]: Clean up t... |
439 |
} |
31143d5d5 AFS: implement ba... |
440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 |
/* * set the attributes of an inode */ int afs_setattr(struct dentry *dentry, struct iattr *attr) { struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode); struct key *key; int ret; _enter("{%x:%u},{n=%s},%x", vnode->fid.vid, vnode->fid.vnode, dentry->d_name.name, attr->ia_valid); if (!(attr->ia_valid & (ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_MTIME))) { _leave(" = 0 [unsupported]"); return 0; } /* flush any dirty data outstanding on a regular file */ if (S_ISREG(vnode->vfs_inode.i_mode)) { filemap_write_and_wait(vnode->vfs_inode.i_mapping); afs_writeback_all(vnode); } if (attr->ia_valid & ATTR_FILE) { key = attr->ia_file->private_data; } else { key = afs_request_key(vnode->volume->cell); if (IS_ERR(key)) { ret = PTR_ERR(key); goto error; } } ret = afs_vnode_setattr(vnode, key, attr); if (!(attr->ia_valid & ATTR_FILE)) key_put(key); error: _leave(" = %d", ret); return ret; } |