Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/nfs/unlink.c | |
4 | * | |
5 | * nfs sillydelete handling | |
6 | * | |
1da177e4 LT |
7 | */ |
8 | ||
9 | #include <linux/slab.h> | |
10 | #include <linux/string.h> | |
11 | #include <linux/dcache.h> | |
12 | #include <linux/sunrpc/sched.h> | |
13 | #include <linux/sunrpc/clnt.h> | |
14 | #include <linux/nfs_fs.h> | |
b35e7041 LT |
15 | #include <linux/sched.h> |
16 | #include <linux/wait.h> | |
779c5179 | 17 | #include <linux/namei.h> |
f7be7284 | 18 | #include <linux/fsnotify.h> |
1da177e4 | 19 | |
ef818a28 | 20 | #include "internal.h" |
472cfbd9 | 21 | #include "nfs4_fs.h" |
779c5179 JL |
22 | #include "iostat.h" |
23 | #include "delegation.h" | |
ef818a28 | 24 | |
70ded201 TM |
25 | #include "nfstrace.h" |
26 | ||
1da177e4 | 27 | /** |
e4eff1a6 | 28 | * nfs_free_unlinkdata - release data from a sillydelete operation. |
1da177e4 LT |
29 | * @data: pointer to unlink structure. |
30 | */ | |
31 | static void | |
e4eff1a6 | 32 | nfs_free_unlinkdata(struct nfs_unlinkdata *data) |
1da177e4 | 33 | { |
a52458b4 | 34 | put_cred(data->cred); |
e4eff1a6 TM |
35 | kfree(data->args.name.name); |
36 | kfree(data); | |
1da177e4 LT |
37 | } |
38 | ||
1da177e4 LT |
39 | /** |
40 | * nfs_async_unlink_done - Sillydelete post-processing | |
41 | * @task: rpc_task of the sillydelete | |
302fad7b | 42 | * @calldata: pointer to nfs_unlinkdata |
1da177e4 LT |
43 | * |
44 | * Do the directory attribute update. | |
45 | */ | |
963d8fe5 | 46 | static void nfs_async_unlink_done(struct rpc_task *task, void *calldata) |
1da177e4 | 47 | { |
e4eff1a6 | 48 | struct nfs_unlinkdata *data = calldata; |
884be175 | 49 | struct inode *dir = d_inode(data->dentry->d_parent); |
e4eff1a6 | 50 | |
70ded201 | 51 | trace_nfs_sillyrename_unlink(data, task->tk_status); |
e4eff1a6 | 52 | if (!NFS_PROTO(dir)->unlink_done(task, dir)) |
d00c5d43 | 53 | rpc_restart_call_prepare(task); |
1da177e4 LT |
54 | } |
55 | ||
56 | /** | |
57 | * nfs_async_unlink_release - Release the sillydelete data. | |
302fad7b | 58 | * @calldata: struct nfs_unlinkdata to release |
1da177e4 LT |
59 | * |
60 | * We need to call nfs_put_unlinkdata as a 'tk_release' task since the | |
61 | * rpc_task would be freed too. | |
62 | */ | |
963d8fe5 | 63 | static void nfs_async_unlink_release(void *calldata) |
1da177e4 | 64 | { |
963d8fe5 | 65 | struct nfs_unlinkdata *data = calldata; |
884be175 AV |
66 | struct dentry *dentry = data->dentry; |
67 | struct super_block *sb = dentry->d_sb; | |
565277f6 | 68 | |
884be175 AV |
69 | up_read_non_owner(&NFS_I(d_inode(dentry->d_parent))->rmdir_sem); |
70 | d_lookup_done(dentry); | |
e4eff1a6 | 71 | nfs_free_unlinkdata(data); |
884be175 | 72 | dput(dentry); |
322b2b90 | 73 | nfs_sb_deactive(sb); |
1da177e4 LT |
74 | } |
75 | ||
17280175 | 76 | static void nfs_unlink_prepare(struct rpc_task *task, void *calldata) |
472cfbd9 AA |
77 | { |
78 | struct nfs_unlinkdata *data = calldata; | |
884be175 AV |
79 | struct inode *dir = d_inode(data->dentry->d_parent); |
80 | NFS_PROTO(dir)->unlink_rpc_prepare(task, data); | |
472cfbd9 | 81 | } |
472cfbd9 | 82 | |
963d8fe5 TM |
83 | static const struct rpc_call_ops nfs_unlink_ops = { |
84 | .rpc_call_done = nfs_async_unlink_done, | |
85 | .rpc_release = nfs_async_unlink_release, | |
472cfbd9 | 86 | .rpc_call_prepare = nfs_unlink_prepare, |
963d8fe5 TM |
87 | }; |
88 | ||
ed7e9ad0 | 89 | static void nfs_do_call_unlink(struct inode *inode, struct nfs_unlinkdata *data) |
e4eff1a6 | 90 | { |
5138fde0 TM |
91 | struct rpc_message msg = { |
92 | .rpc_argp = &data->args, | |
93 | .rpc_resp = &data->res, | |
94 | .rpc_cred = data->cred, | |
95 | }; | |
c970aa85 | 96 | struct rpc_task_setup task_setup_data = { |
5138fde0 | 97 | .rpc_message = &msg, |
c970aa85 TM |
98 | .callback_ops = &nfs_unlink_ops, |
99 | .callback_data = data, | |
1daef0a8 | 100 | .workqueue = nfsiod_workqueue, |
c970aa85 TM |
101 | .flags = RPC_TASK_ASYNC, |
102 | }; | |
e4eff1a6 | 103 | struct rpc_task *task; |
884be175 AV |
104 | struct inode *dir = d_inode(data->dentry->d_parent); |
105 | nfs_sb_active(dir->i_sb); | |
106 | data->args.fh = NFS_FH(dir); | |
107 | nfs_fattr_init(data->res.dir_attr); | |
108 | ||
ed7e9ad0 | 109 | NFS_PROTO(dir)->unlink_setup(&msg, data->dentry, inode); |
884be175 AV |
110 | |
111 | task_setup_data.rpc_client = NFS_CLIENT(dir); | |
112 | task = rpc_run_task(&task_setup_data); | |
113 | if (!IS_ERR(task)) | |
114 | rpc_put_task_async(task); | |
115 | } | |
116 | ||
ed7e9ad0 | 117 | static int nfs_call_unlink(struct dentry *dentry, struct inode *inode, struct nfs_unlinkdata *data) |
884be175 AV |
118 | { |
119 | struct inode *dir = d_inode(dentry->d_parent); | |
565277f6 TM |
120 | struct dentry *alias; |
121 | ||
884be175 AV |
122 | down_read_non_owner(&NFS_I(dir)->rmdir_sem); |
123 | alias = d_alloc_parallel(dentry->d_parent, &data->args.name, &data->wq); | |
124 | if (IS_ERR(alias)) { | |
125 | up_read_non_owner(&NFS_I(dir)->rmdir_sem); | |
126 | return 0; | |
127 | } | |
128 | if (!d_in_lookup(alias)) { | |
73ca1001 | 129 | int ret; |
b1942c5f | 130 | void *devname_garbage = NULL; |
609005c3 | 131 | |
565277f6 TM |
132 | /* |
133 | * Hey, we raced with lookup... See if we need to transfer | |
134 | * the sillyrename information to the aliased dentry. | |
135 | */ | |
565277f6 | 136 | spin_lock(&alias->d_lock); |
884be175 | 137 | if (d_really_is_positive(alias) && |
609005c3 | 138 | !(alias->d_flags & DCACHE_NFSFS_RENAMED)) { |
b1942c5f | 139 | devname_garbage = alias->d_fsdata; |
565277f6 | 140 | alias->d_fsdata = data; |
fccca7fc | 141 | alias->d_flags |= DCACHE_NFSFS_RENAMED; |
565277f6 | 142 | ret = 1; |
73ca1001 JL |
143 | } else |
144 | ret = 0; | |
565277f6 | 145 | spin_unlock(&alias->d_lock); |
565277f6 | 146 | dput(alias); |
884be175 | 147 | up_read_non_owner(&NFS_I(dir)->rmdir_sem); |
b1942c5f AV |
148 | /* |
149 | * If we'd displaced old cached devname, free it. At that | |
150 | * point dentry is definitely not a root, so we won't need | |
151 | * that anymore. | |
152 | */ | |
73ca1001 | 153 | kfree(devname_garbage); |
565277f6 TM |
154 | return ret; |
155 | } | |
884be175 | 156 | data->dentry = alias; |
ed7e9ad0 | 157 | nfs_do_call_unlink(inode, data); |
565277f6 TM |
158 | return 1; |
159 | } | |
160 | ||
1da177e4 LT |
161 | /** |
162 | * nfs_async_unlink - asynchronous unlinking of a file | |
302fad7b TM |
163 | * @dentry: parent directory of dentry |
164 | * @name: name of dentry to unlink | |
1da177e4 | 165 | */ |
779c5179 | 166 | static int |
beffb8fe | 167 | nfs_async_unlink(struct dentry *dentry, const struct qstr *name) |
1da177e4 | 168 | { |
e4eff1a6 TM |
169 | struct nfs_unlinkdata *data; |
170 | int status = -ENOMEM; | |
b1942c5f | 171 | void *devname_garbage = NULL; |
1da177e4 | 172 | |
bd647545 | 173 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
e4eff1a6 | 174 | if (data == NULL) |
1da177e4 | 175 | goto out; |
884be175 AV |
176 | data->args.name.name = kstrdup(name->name, GFP_KERNEL); |
177 | if (!data->args.name.name) | |
178 | goto out_free; | |
179 | data->args.name.len = name->len; | |
1da177e4 | 180 | |
a52458b4 | 181 | data->cred = get_current_cred(); |
d346890b | 182 | data->res.dir_attr = &data->dir_attr; |
884be175 | 183 | init_waitqueue_head(&data->wq); |
1da177e4 | 184 | |
e4eff1a6 | 185 | status = -EBUSY; |
1da177e4 | 186 | spin_lock(&dentry->d_lock); |
e4eff1a6 TM |
187 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) |
188 | goto out_unlock; | |
1da177e4 | 189 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; |
b1942c5f | 190 | devname_garbage = dentry->d_fsdata; |
e4eff1a6 | 191 | dentry->d_fsdata = data; |
1da177e4 | 192 | spin_unlock(&dentry->d_lock); |
b1942c5f AV |
193 | /* |
194 | * If we'd displaced old cached devname, free it. At that | |
195 | * point dentry is definitely not a root, so we won't need | |
196 | * that anymore. | |
197 | */ | |
96aa1549 | 198 | kfree(devname_garbage); |
e4eff1a6 TM |
199 | return 0; |
200 | out_unlock: | |
201 | spin_unlock(&dentry->d_lock); | |
a52458b4 | 202 | put_cred(data->cred); |
884be175 | 203 | kfree(data->args.name.name); |
1da177e4 LT |
204 | out_free: |
205 | kfree(data); | |
e4eff1a6 | 206 | out: |
1da177e4 LT |
207 | return status; |
208 | } | |
209 | ||
210 | /** | |
211 | * nfs_complete_unlink - Initialize completion of the sillydelete | |
212 | * @dentry: dentry to delete | |
e4eff1a6 | 213 | * @inode: inode |
1da177e4 LT |
214 | * |
215 | * Since we're most likely to be called by dentry_iput(), we | |
216 | * only use the dentry to find the sillydelete. We then copy the name | |
217 | * into the qstr. | |
218 | */ | |
219 | void | |
e4eff1a6 | 220 | nfs_complete_unlink(struct dentry *dentry, struct inode *inode) |
1da177e4 | 221 | { |
884be175 | 222 | struct nfs_unlinkdata *data; |
1da177e4 | 223 | |
1da177e4 | 224 | spin_lock(&dentry->d_lock); |
884be175 AV |
225 | dentry->d_flags &= ~DCACHE_NFSFS_RENAMED; |
226 | data = dentry->d_fsdata; | |
227 | dentry->d_fsdata = NULL; | |
1da177e4 | 228 | spin_unlock(&dentry->d_lock); |
e4eff1a6 | 229 | |
ed7e9ad0 | 230 | if (NFS_STALE(inode) || !nfs_call_unlink(dentry, inode, data)) |
e4eff1a6 | 231 | nfs_free_unlinkdata(data); |
1da177e4 | 232 | } |
779c5179 | 233 | |
d3d4152a JL |
234 | /* Cancel a queued async unlink. Called when a sillyrename run fails. */ |
235 | static void | |
236 | nfs_cancel_async_unlink(struct dentry *dentry) | |
237 | { | |
238 | spin_lock(&dentry->d_lock); | |
239 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
240 | struct nfs_unlinkdata *data = dentry->d_fsdata; | |
241 | ||
242 | dentry->d_flags &= ~DCACHE_NFSFS_RENAMED; | |
b1942c5f | 243 | dentry->d_fsdata = NULL; |
d3d4152a JL |
244 | spin_unlock(&dentry->d_lock); |
245 | nfs_free_unlinkdata(data); | |
246 | return; | |
247 | } | |
248 | spin_unlock(&dentry->d_lock); | |
249 | } | |
250 | ||
d3d4152a JL |
251 | /** |
252 | * nfs_async_rename_done - Sillyrename post-processing | |
253 | * @task: rpc_task of the sillyrename | |
254 | * @calldata: nfs_renamedata for the sillyrename | |
255 | * | |
256 | * Do the directory attribute updates and the d_move | |
257 | */ | |
258 | static void nfs_async_rename_done(struct rpc_task *task, void *calldata) | |
259 | { | |
260 | struct nfs_renamedata *data = calldata; | |
261 | struct inode *old_dir = data->old_dir; | |
262 | struct inode *new_dir = data->new_dir; | |
73ca1001 | 263 | struct dentry *old_dentry = data->old_dentry; |
d3d4152a | 264 | |
70ded201 TM |
265 | trace_nfs_sillyrename_rename(old_dir, old_dentry, |
266 | new_dir, data->new_dentry, task->tk_status); | |
d3d4152a | 267 | if (!NFS_PROTO(old_dir)->rename_done(task, old_dir, new_dir)) { |
d00c5d43 | 268 | rpc_restart_call_prepare(task); |
d3d4152a JL |
269 | return; |
270 | } | |
271 | ||
96f9d8c0 JL |
272 | if (data->complete) |
273 | data->complete(task, data); | |
d3d4152a JL |
274 | } |
275 | ||
276 | /** | |
277 | * nfs_async_rename_release - Release the sillyrename data. | |
278 | * @calldata: the struct nfs_renamedata to be released | |
279 | */ | |
280 | static void nfs_async_rename_release(void *calldata) | |
281 | { | |
282 | struct nfs_renamedata *data = calldata; | |
283 | struct super_block *sb = data->old_dir->i_sb; | |
284 | ||
2b0143b5 DH |
285 | if (d_really_is_positive(data->old_dentry)) |
286 | nfs_mark_for_revalidate(d_inode(data->old_dentry)); | |
d3d4152a | 287 | |
818a8dbe BC |
288 | /* The result of the rename is unknown. Play it safe by |
289 | * forcing a new lookup */ | |
290 | if (data->cancelled) { | |
291 | spin_lock(&data->old_dir->i_lock); | |
292 | nfs_force_lookup_revalidate(data->old_dir); | |
293 | spin_unlock(&data->old_dir->i_lock); | |
294 | if (data->new_dir != data->old_dir) { | |
295 | spin_lock(&data->new_dir->i_lock); | |
296 | nfs_force_lookup_revalidate(data->new_dir); | |
297 | spin_unlock(&data->new_dir->i_lock); | |
298 | } | |
299 | } | |
300 | ||
d3d4152a JL |
301 | dput(data->old_dentry); |
302 | dput(data->new_dentry); | |
303 | iput(data->old_dir); | |
304 | iput(data->new_dir); | |
305 | nfs_sb_deactive(sb); | |
a52458b4 | 306 | put_cred(data->cred); |
d3d4152a JL |
307 | kfree(data); |
308 | } | |
309 | ||
d3d4152a JL |
310 | static void nfs_rename_prepare(struct rpc_task *task, void *calldata) |
311 | { | |
312 | struct nfs_renamedata *data = calldata; | |
c6bfa1a1 | 313 | NFS_PROTO(data->old_dir)->rename_rpc_prepare(task, data); |
d3d4152a | 314 | } |
d3d4152a JL |
315 | |
316 | static const struct rpc_call_ops nfs_rename_ops = { | |
317 | .rpc_call_done = nfs_async_rename_done, | |
318 | .rpc_release = nfs_async_rename_release, | |
d3d4152a | 319 | .rpc_call_prepare = nfs_rename_prepare, |
d3d4152a JL |
320 | }; |
321 | ||
322 | /** | |
323 | * nfs_async_rename - perform an asynchronous rename operation | |
324 | * @old_dir: directory that currently holds the dentry to be renamed | |
325 | * @new_dir: target directory for the rename | |
326 | * @old_dentry: original dentry to be renamed | |
327 | * @new_dentry: dentry to which the old_dentry should be renamed | |
302fad7b | 328 | * @complete: Function to run on successful completion |
d3d4152a JL |
329 | * |
330 | * It's expected that valid references to the dentries and inodes are held | |
331 | */ | |
0e862a40 | 332 | struct rpc_task * |
d3d4152a | 333 | nfs_async_rename(struct inode *old_dir, struct inode *new_dir, |
96f9d8c0 JL |
334 | struct dentry *old_dentry, struct dentry *new_dentry, |
335 | void (*complete)(struct rpc_task *, struct nfs_renamedata *)) | |
d3d4152a JL |
336 | { |
337 | struct nfs_renamedata *data; | |
338 | struct rpc_message msg = { }; | |
339 | struct rpc_task_setup task_setup_data = { | |
340 | .rpc_message = &msg, | |
341 | .callback_ops = &nfs_rename_ops, | |
342 | .workqueue = nfsiod_workqueue, | |
343 | .rpc_client = NFS_CLIENT(old_dir), | |
344 | .flags = RPC_TASK_ASYNC, | |
345 | }; | |
d3d4152a | 346 | |
dfb4f309 | 347 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
d3d4152a JL |
348 | if (data == NULL) |
349 | return ERR_PTR(-ENOMEM); | |
1174dd1f | 350 | task_setup_data.callback_data = data; |
d3d4152a | 351 | |
a52458b4 | 352 | data->cred = get_current_cred(); |
d3d4152a JL |
353 | |
354 | msg.rpc_argp = &data->args; | |
355 | msg.rpc_resp = &data->res; | |
356 | msg.rpc_cred = data->cred; | |
357 | ||
358 | /* set up nfs_renamedata */ | |
359 | data->old_dir = old_dir; | |
a4118ee1 | 360 | ihold(old_dir); |
d3d4152a | 361 | data->new_dir = new_dir; |
a4118ee1 | 362 | ihold(new_dir); |
d3d4152a JL |
363 | data->old_dentry = dget(old_dentry); |
364 | data->new_dentry = dget(new_dentry); | |
365 | nfs_fattr_init(&data->old_fattr); | |
366 | nfs_fattr_init(&data->new_fattr); | |
96f9d8c0 | 367 | data->complete = complete; |
d3d4152a JL |
368 | |
369 | /* set up nfs_renameargs */ | |
370 | data->args.old_dir = NFS_FH(old_dir); | |
371 | data->args.old_name = &old_dentry->d_name; | |
372 | data->args.new_dir = NFS_FH(new_dir); | |
373 | data->args.new_name = &new_dentry->d_name; | |
374 | ||
375 | /* set up nfs_renameres */ | |
376 | data->res.old_fattr = &data->old_fattr; | |
377 | data->res.new_fattr = &data->new_fattr; | |
378 | ||
379 | nfs_sb_active(old_dir->i_sb); | |
380 | ||
f2c2c552 | 381 | NFS_PROTO(data->old_dir)->rename_setup(&msg, old_dentry, new_dentry); |
d3d4152a | 382 | |
f7732d65 | 383 | return rpc_run_task(&task_setup_data); |
d3d4152a JL |
384 | } |
385 | ||
96f9d8c0 JL |
386 | /* |
387 | * Perform tasks needed when a sillyrename is done such as cancelling the | |
388 | * queued async unlink if it failed. | |
389 | */ | |
390 | static void | |
391 | nfs_complete_sillyrename(struct rpc_task *task, struct nfs_renamedata *data) | |
392 | { | |
f7be7284 JL |
393 | struct dentry *dentry = data->old_dentry; |
394 | ||
395 | if (task->tk_status != 0) { | |
396 | nfs_cancel_async_unlink(dentry); | |
397 | return; | |
398 | } | |
399 | ||
400 | /* | |
401 | * vfs_unlink and the like do not issue this when a file is | |
402 | * sillyrenamed, so do it here. | |
403 | */ | |
404 | fsnotify_nameremove(dentry, 0); | |
96f9d8c0 JL |
405 | } |
406 | ||
c2dd1378 TM |
407 | #define SILLYNAME_PREFIX ".nfs" |
408 | #define SILLYNAME_PREFIX_LEN ((unsigned)sizeof(SILLYNAME_PREFIX) - 1) | |
409 | #define SILLYNAME_FILEID_LEN ((unsigned)sizeof(u64) << 1) | |
410 | #define SILLYNAME_COUNTER_LEN ((unsigned)sizeof(unsigned int) << 1) | |
411 | #define SILLYNAME_LEN (SILLYNAME_PREFIX_LEN + \ | |
412 | SILLYNAME_FILEID_LEN + \ | |
413 | SILLYNAME_COUNTER_LEN) | |
414 | ||
779c5179 JL |
415 | /** |
416 | * nfs_sillyrename - Perform a silly-rename of a dentry | |
417 | * @dir: inode of directory that contains dentry | |
418 | * @dentry: dentry to be sillyrenamed | |
419 | * | |
420 | * NFSv2/3 is stateless and the server doesn't know when the client is | |
421 | * holding a file open. To prevent application problems when a file is | |
422 | * unlinked while it's still open, the client performs a "silly-rename". | |
423 | * That is, it renames the file to a hidden file in the same directory, | |
424 | * and only performs the unlink once the last reference to it is put. | |
425 | * | |
426 | * The final cleanup is done during dentry_iput. | |
674e405b BF |
427 | * |
428 | * (Note: NFSv4 is stateful, and has opens, so in theory an NFSv4 server | |
429 | * could take responsibility for keeping open files referenced. The server | |
430 | * would also need to ensure that opened-but-deleted files were kept over | |
431 | * reboots. However, we may not assume a server does so. (RFC 5661 | |
432 | * does provide an OPEN4_RESULT_PRESERVE_UNLINKED flag that a server can | |
433 | * use to advertise that it does this; some day we may take advantage of | |
434 | * it.)) | |
779c5179 JL |
435 | */ |
436 | int | |
437 | nfs_sillyrename(struct inode *dir, struct dentry *dentry) | |
438 | { | |
439 | static unsigned int sillycounter; | |
c2dd1378 TM |
440 | unsigned char silly[SILLYNAME_LEN + 1]; |
441 | unsigned long long fileid; | |
779c5179 | 442 | struct dentry *sdentry; |
3cb3fd6d | 443 | struct inode *inode = d_inode(dentry); |
d3d4152a | 444 | struct rpc_task *task; |
4f5829d7 | 445 | int error = -EBUSY; |
779c5179 | 446 | |
6de1472f AV |
447 | dfprintk(VFS, "NFS: silly-rename(%pd2, ct=%d)\n", |
448 | dentry, d_count(dentry)); | |
779c5179 JL |
449 | nfs_inc_stats(dir, NFSIOS_SILLYRENAME); |
450 | ||
451 | /* | |
452 | * We don't allow a dentry to be silly-renamed twice. | |
453 | */ | |
779c5179 JL |
454 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) |
455 | goto out; | |
456 | ||
2b0143b5 | 457 | fileid = NFS_FILEID(d_inode(dentry)); |
779c5179 | 458 | |
779c5179 JL |
459 | sdentry = NULL; |
460 | do { | |
c2dd1378 | 461 | int slen; |
779c5179 JL |
462 | dput(sdentry); |
463 | sillycounter++; | |
c2dd1378 TM |
464 | slen = scnprintf(silly, sizeof(silly), |
465 | SILLYNAME_PREFIX "%0*llx%0*x", | |
466 | SILLYNAME_FILEID_LEN, fileid, | |
467 | SILLYNAME_COUNTER_LEN, sillycounter); | |
779c5179 | 468 | |
6de1472f AV |
469 | dfprintk(VFS, "NFS: trying to rename %pd to %s\n", |
470 | dentry, silly); | |
779c5179 JL |
471 | |
472 | sdentry = lookup_one_len(silly, dentry->d_parent, slen); | |
473 | /* | |
474 | * N.B. Better to return EBUSY here ... it could be | |
475 | * dangerous to delete the file while it's in use. | |
476 | */ | |
477 | if (IS_ERR(sdentry)) | |
478 | goto out; | |
2b0143b5 | 479 | } while (d_inode(sdentry) != NULL); /* need negative lookup */ |
779c5179 | 480 | |
3cb3fd6d TM |
481 | ihold(inode); |
482 | ||
d3d4152a JL |
483 | /* queue unlink first. Can't do this from rpc_release as it |
484 | * has to allocate memory | |
485 | */ | |
884be175 | 486 | error = nfs_async_unlink(dentry, &sdentry->d_name); |
d3d4152a JL |
487 | if (error) |
488 | goto out_dput; | |
489 | ||
490 | /* run the rename task, undo unlink if it fails */ | |
96f9d8c0 JL |
491 | task = nfs_async_rename(dir, dir, dentry, sdentry, |
492 | nfs_complete_sillyrename); | |
d3d4152a JL |
493 | if (IS_ERR(task)) { |
494 | error = -EBUSY; | |
495 | nfs_cancel_async_unlink(dentry); | |
496 | goto out_dput; | |
779c5179 | 497 | } |
d3d4152a JL |
498 | |
499 | /* wait for the RPC task to complete, unless a SIGKILL intervenes */ | |
500 | error = rpc_wait_for_completion_task(task); | |
501 | if (error == 0) | |
502 | error = task->tk_status; | |
5a7a613a TM |
503 | switch (error) { |
504 | case 0: | |
505 | /* The rename succeeded */ | |
506 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
3cb3fd6d TM |
507 | spin_lock(&inode->i_lock); |
508 | NFS_I(inode)->attr_gencount = nfs_inc_attr_generation_counter(); | |
509 | NFS_I(inode)->cache_validity |= NFS_INO_INVALID_CHANGE | |
510 | | NFS_INO_INVALID_CTIME | |
511 | | NFS_INO_REVAL_FORCED; | |
512 | spin_unlock(&inode->i_lock); | |
5a7a613a TM |
513 | d_move(dentry, sdentry); |
514 | break; | |
515 | case -ERESTARTSYS: | |
516 | /* The result of the rename is unknown. Play it safe by | |
517 | * forcing a new lookup */ | |
518 | d_drop(dentry); | |
519 | d_drop(sdentry); | |
520 | } | |
d3d4152a JL |
521 | rpc_put_task(task); |
522 | out_dput: | |
3cb3fd6d | 523 | iput(inode); |
779c5179 JL |
524 | dput(sdentry); |
525 | out: | |
526 | return error; | |
527 | } |