Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/nfs/unlink.c | |
3 | * | |
4 | * nfs sillydelete handling | |
5 | * | |
1da177e4 LT |
6 | */ |
7 | ||
8 | #include <linux/slab.h> | |
9 | #include <linux/string.h> | |
10 | #include <linux/dcache.h> | |
11 | #include <linux/sunrpc/sched.h> | |
12 | #include <linux/sunrpc/clnt.h> | |
13 | #include <linux/nfs_fs.h> | |
b35e7041 LT |
14 | #include <linux/sched.h> |
15 | #include <linux/wait.h> | |
779c5179 | 16 | #include <linux/namei.h> |
1da177e4 | 17 | |
ef818a28 | 18 | #include "internal.h" |
472cfbd9 | 19 | #include "nfs4_fs.h" |
779c5179 JL |
20 | #include "iostat.h" |
21 | #include "delegation.h" | |
ef818a28 | 22 | |
1da177e4 | 23 | /** |
e4eff1a6 | 24 | * nfs_free_unlinkdata - release data from a sillydelete operation. |
1da177e4 LT |
25 | * @data: pointer to unlink structure. |
26 | */ | |
27 | static void | |
e4eff1a6 | 28 | nfs_free_unlinkdata(struct nfs_unlinkdata *data) |
1da177e4 | 29 | { |
e4eff1a6 TM |
30 | iput(data->dir); |
31 | put_rpccred(data->cred); | |
32 | kfree(data->args.name.name); | |
33 | kfree(data); | |
1da177e4 LT |
34 | } |
35 | ||
36 | #define NAME_ALLOC_LEN(len) ((len+16) & ~15) | |
37 | /** | |
38 | * nfs_copy_dname - copy dentry name to data structure | |
39 | * @dentry: pointer to dentry | |
40 | * @data: nfs_unlinkdata | |
41 | */ | |
e4eff1a6 | 42 | static int nfs_copy_dname(struct dentry *dentry, struct nfs_unlinkdata *data) |
1da177e4 LT |
43 | { |
44 | char *str; | |
45 | int len = dentry->d_name.len; | |
46 | ||
e4eff1a6 | 47 | str = kmemdup(dentry->d_name.name, NAME_ALLOC_LEN(len), GFP_KERNEL); |
1da177e4 | 48 | if (!str) |
e4eff1a6 TM |
49 | return -ENOMEM; |
50 | data->args.name.len = len; | |
51 | data->args.name.name = str; | |
52 | return 0; | |
1da177e4 LT |
53 | } |
54 | ||
565277f6 TM |
55 | static void nfs_free_dname(struct nfs_unlinkdata *data) |
56 | { | |
57 | kfree(data->args.name.name); | |
58 | data->args.name.name = NULL; | |
59 | data->args.name.len = 0; | |
60 | } | |
61 | ||
62 | static void nfs_dec_sillycount(struct inode *dir) | |
63 | { | |
64 | struct nfs_inode *nfsi = NFS_I(dir); | |
65 | if (atomic_dec_return(&nfsi->silly_count) == 1) | |
66 | wake_up(&nfsi->waitqueue); | |
67 | } | |
68 | ||
1da177e4 LT |
69 | /** |
70 | * nfs_async_unlink_done - Sillydelete post-processing | |
71 | * @task: rpc_task of the sillydelete | |
72 | * | |
73 | * Do the directory attribute update. | |
74 | */ | |
963d8fe5 | 75 | static void nfs_async_unlink_done(struct rpc_task *task, void *calldata) |
1da177e4 | 76 | { |
e4eff1a6 TM |
77 | struct nfs_unlinkdata *data = calldata; |
78 | struct inode *dir = data->dir; | |
79 | ||
80 | if (!NFS_PROTO(dir)->unlink_done(task, dir)) | |
d00c5d43 | 81 | rpc_restart_call_prepare(task); |
1da177e4 LT |
82 | } |
83 | ||
84 | /** | |
85 | * nfs_async_unlink_release - Release the sillydelete data. | |
86 | * @task: rpc_task of the sillydelete | |
87 | * | |
88 | * We need to call nfs_put_unlinkdata as a 'tk_release' task since the | |
89 | * rpc_task would be freed too. | |
90 | */ | |
963d8fe5 | 91 | static void nfs_async_unlink_release(void *calldata) |
1da177e4 | 92 | { |
963d8fe5 | 93 | struct nfs_unlinkdata *data = calldata; |
744d18db | 94 | struct super_block *sb = data->dir->i_sb; |
565277f6 TM |
95 | |
96 | nfs_dec_sillycount(data->dir); | |
e4eff1a6 | 97 | nfs_free_unlinkdata(data); |
322b2b90 | 98 | nfs_sb_deactive(sb); |
1da177e4 LT |
99 | } |
100 | ||
17280175 | 101 | static void nfs_unlink_prepare(struct rpc_task *task, void *calldata) |
472cfbd9 AA |
102 | { |
103 | struct nfs_unlinkdata *data = calldata; | |
34e137cc | 104 | NFS_PROTO(data->dir)->unlink_rpc_prepare(task, data); |
472cfbd9 | 105 | } |
472cfbd9 | 106 | |
963d8fe5 TM |
107 | static const struct rpc_call_ops nfs_unlink_ops = { |
108 | .rpc_call_done = nfs_async_unlink_done, | |
109 | .rpc_release = nfs_async_unlink_release, | |
472cfbd9 | 110 | .rpc_call_prepare = nfs_unlink_prepare, |
963d8fe5 TM |
111 | }; |
112 | ||
565277f6 | 113 | static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct nfs_unlinkdata *data) |
e4eff1a6 | 114 | { |
5138fde0 TM |
115 | struct rpc_message msg = { |
116 | .rpc_argp = &data->args, | |
117 | .rpc_resp = &data->res, | |
118 | .rpc_cred = data->cred, | |
119 | }; | |
c970aa85 | 120 | struct rpc_task_setup task_setup_data = { |
5138fde0 | 121 | .rpc_message = &msg, |
c970aa85 TM |
122 | .callback_ops = &nfs_unlink_ops, |
123 | .callback_data = data, | |
1daef0a8 | 124 | .workqueue = nfsiod_workqueue, |
c970aa85 TM |
125 | .flags = RPC_TASK_ASYNC, |
126 | }; | |
e4eff1a6 | 127 | struct rpc_task *task; |
565277f6 TM |
128 | struct dentry *alias; |
129 | ||
130 | alias = d_lookup(parent, &data->args.name); | |
131 | if (alias != NULL) { | |
73ca1001 | 132 | int ret; |
b1942c5f | 133 | void *devname_garbage = NULL; |
609005c3 | 134 | |
565277f6 TM |
135 | /* |
136 | * Hey, we raced with lookup... See if we need to transfer | |
137 | * the sillyrename information to the aliased dentry. | |
138 | */ | |
139 | nfs_free_dname(data); | |
73ca1001 | 140 | ret = nfs_copy_dname(alias, data); |
565277f6 | 141 | spin_lock(&alias->d_lock); |
73ca1001 | 142 | if (ret == 0 && alias->d_inode != NULL && |
609005c3 | 143 | !(alias->d_flags & DCACHE_NFSFS_RENAMED)) { |
b1942c5f | 144 | devname_garbage = alias->d_fsdata; |
565277f6 | 145 | alias->d_fsdata = data; |
fccca7fc | 146 | alias->d_flags |= DCACHE_NFSFS_RENAMED; |
565277f6 | 147 | ret = 1; |
73ca1001 JL |
148 | } else |
149 | ret = 0; | |
565277f6 TM |
150 | spin_unlock(&alias->d_lock); |
151 | nfs_dec_sillycount(dir); | |
152 | dput(alias); | |
b1942c5f AV |
153 | /* |
154 | * If we'd displaced old cached devname, free it. At that | |
155 | * point dentry is definitely not a root, so we won't need | |
156 | * that anymore. | |
157 | */ | |
73ca1001 | 158 | kfree(devname_garbage); |
565277f6 TM |
159 | return ret; |
160 | } | |
161 | data->dir = igrab(dir); | |
162 | if (!data->dir) { | |
163 | nfs_dec_sillycount(dir); | |
164 | return 0; | |
165 | } | |
1daef0a8 | 166 | nfs_sb_active(dir->i_sb); |
565277f6 | 167 | data->args.fh = NFS_FH(dir); |
d346890b | 168 | nfs_fattr_init(data->res.dir_attr); |
565277f6 | 169 | |
5138fde0 | 170 | NFS_PROTO(dir)->unlink_setup(&msg, dir); |
c970aa85 | 171 | |
5138fde0 | 172 | task_setup_data.rpc_client = NFS_CLIENT(dir); |
c970aa85 | 173 | task = rpc_run_task(&task_setup_data); |
565277f6 | 174 | if (!IS_ERR(task)) |
bf294b41 | 175 | rpc_put_task_async(task); |
565277f6 TM |
176 | return 1; |
177 | } | |
178 | ||
179 | static int nfs_call_unlink(struct dentry *dentry, struct nfs_unlinkdata *data) | |
180 | { | |
e4eff1a6 TM |
181 | struct dentry *parent; |
182 | struct inode *dir; | |
565277f6 | 183 | int ret = 0; |
e4eff1a6 | 184 | |
e4eff1a6 TM |
185 | |
186 | parent = dget_parent(dentry); | |
187 | if (parent == NULL) | |
188 | goto out_free; | |
565277f6 | 189 | dir = parent->d_inode; |
565277f6 TM |
190 | /* Non-exclusive lock protects against concurrent lookup() calls */ |
191 | spin_lock(&dir->i_lock); | |
192 | if (atomic_inc_not_zero(&NFS_I(dir)->silly_count) == 0) { | |
193 | /* Deferred delete */ | |
194 | hlist_add_head(&data->list, &NFS_I(dir)->silly_list); | |
195 | spin_unlock(&dir->i_lock); | |
196 | ret = 1; | |
197 | goto out_dput; | |
198 | } | |
199 | spin_unlock(&dir->i_lock); | |
200 | ret = nfs_do_call_unlink(parent, dir, data); | |
201 | out_dput: | |
e4eff1a6 | 202 | dput(parent); |
565277f6 TM |
203 | out_free: |
204 | return ret; | |
205 | } | |
e4eff1a6 | 206 | |
565277f6 TM |
207 | void nfs_block_sillyrename(struct dentry *dentry) |
208 | { | |
209 | struct nfs_inode *nfsi = NFS_I(dentry->d_inode); | |
e4eff1a6 | 210 | |
565277f6 TM |
211 | wait_event(nfsi->waitqueue, atomic_cmpxchg(&nfsi->silly_count, 1, 0) == 1); |
212 | } | |
213 | ||
214 | void nfs_unblock_sillyrename(struct dentry *dentry) | |
215 | { | |
216 | struct inode *dir = dentry->d_inode; | |
217 | struct nfs_inode *nfsi = NFS_I(dir); | |
218 | struct nfs_unlinkdata *data; | |
219 | ||
220 | atomic_inc(&nfsi->silly_count); | |
221 | spin_lock(&dir->i_lock); | |
222 | while (!hlist_empty(&nfsi->silly_list)) { | |
223 | if (!atomic_inc_not_zero(&nfsi->silly_count)) | |
224 | break; | |
225 | data = hlist_entry(nfsi->silly_list.first, struct nfs_unlinkdata, list); | |
226 | hlist_del(&data->list); | |
227 | spin_unlock(&dir->i_lock); | |
228 | if (nfs_do_call_unlink(dentry, dir, data) == 0) | |
229 | nfs_free_unlinkdata(data); | |
230 | spin_lock(&dir->i_lock); | |
231 | } | |
232 | spin_unlock(&dir->i_lock); | |
e4eff1a6 TM |
233 | } |
234 | ||
1da177e4 LT |
235 | /** |
236 | * nfs_async_unlink - asynchronous unlinking of a file | |
e4eff1a6 | 237 | * @dir: parent directory of dentry |
1da177e4 LT |
238 | * @dentry: dentry to unlink |
239 | */ | |
779c5179 | 240 | static int |
e4eff1a6 | 241 | nfs_async_unlink(struct inode *dir, struct dentry *dentry) |
1da177e4 | 242 | { |
e4eff1a6 TM |
243 | struct nfs_unlinkdata *data; |
244 | int status = -ENOMEM; | |
b1942c5f | 245 | void *devname_garbage = NULL; |
1da177e4 | 246 | |
bd647545 | 247 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
e4eff1a6 | 248 | if (data == NULL) |
1da177e4 | 249 | goto out; |
1da177e4 | 250 | |
98a8e323 | 251 | data->cred = rpc_lookup_cred(); |
1da177e4 LT |
252 | if (IS_ERR(data->cred)) { |
253 | status = PTR_ERR(data->cred); | |
254 | goto out_free; | |
255 | } | |
d346890b | 256 | data->res.dir_attr = &data->dir_attr; |
1da177e4 | 257 | |
e4eff1a6 | 258 | status = -EBUSY; |
1da177e4 | 259 | spin_lock(&dentry->d_lock); |
e4eff1a6 TM |
260 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) |
261 | goto out_unlock; | |
1da177e4 | 262 | dentry->d_flags |= DCACHE_NFSFS_RENAMED; |
b1942c5f | 263 | devname_garbage = dentry->d_fsdata; |
e4eff1a6 | 264 | dentry->d_fsdata = data; |
1da177e4 | 265 | spin_unlock(&dentry->d_lock); |
b1942c5f AV |
266 | /* |
267 | * If we'd displaced old cached devname, free it. At that | |
268 | * point dentry is definitely not a root, so we won't need | |
269 | * that anymore. | |
270 | */ | |
96aa1549 | 271 | kfree(devname_garbage); |
e4eff1a6 TM |
272 | return 0; |
273 | out_unlock: | |
274 | spin_unlock(&dentry->d_lock); | |
275 | put_rpccred(data->cred); | |
1da177e4 LT |
276 | out_free: |
277 | kfree(data); | |
e4eff1a6 | 278 | out: |
1da177e4 LT |
279 | return status; |
280 | } | |
281 | ||
282 | /** | |
283 | * nfs_complete_unlink - Initialize completion of the sillydelete | |
284 | * @dentry: dentry to delete | |
e4eff1a6 | 285 | * @inode: inode |
1da177e4 LT |
286 | * |
287 | * Since we're most likely to be called by dentry_iput(), we | |
288 | * only use the dentry to find the sillydelete. We then copy the name | |
289 | * into the qstr. | |
290 | */ | |
291 | void | |
e4eff1a6 | 292 | nfs_complete_unlink(struct dentry *dentry, struct inode *inode) |
1da177e4 | 293 | { |
e4eff1a6 | 294 | struct nfs_unlinkdata *data = NULL; |
1da177e4 | 295 | |
1da177e4 | 296 | spin_lock(&dentry->d_lock); |
e4eff1a6 TM |
297 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { |
298 | dentry->d_flags &= ~DCACHE_NFSFS_RENAMED; | |
299 | data = dentry->d_fsdata; | |
b1942c5f | 300 | dentry->d_fsdata = NULL; |
e4eff1a6 | 301 | } |
1da177e4 | 302 | spin_unlock(&dentry->d_lock); |
e4eff1a6 TM |
303 | |
304 | if (data != NULL && (NFS_STALE(inode) || !nfs_call_unlink(dentry, data))) | |
305 | nfs_free_unlinkdata(data); | |
1da177e4 | 306 | } |
779c5179 | 307 | |
d3d4152a JL |
308 | /* Cancel a queued async unlink. Called when a sillyrename run fails. */ |
309 | static void | |
310 | nfs_cancel_async_unlink(struct dentry *dentry) | |
311 | { | |
312 | spin_lock(&dentry->d_lock); | |
313 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) { | |
314 | struct nfs_unlinkdata *data = dentry->d_fsdata; | |
315 | ||
316 | dentry->d_flags &= ~DCACHE_NFSFS_RENAMED; | |
b1942c5f | 317 | dentry->d_fsdata = NULL; |
d3d4152a JL |
318 | spin_unlock(&dentry->d_lock); |
319 | nfs_free_unlinkdata(data); | |
320 | return; | |
321 | } | |
322 | spin_unlock(&dentry->d_lock); | |
323 | } | |
324 | ||
d3d4152a JL |
325 | /** |
326 | * nfs_async_rename_done - Sillyrename post-processing | |
327 | * @task: rpc_task of the sillyrename | |
328 | * @calldata: nfs_renamedata for the sillyrename | |
329 | * | |
330 | * Do the directory attribute updates and the d_move | |
331 | */ | |
332 | static void nfs_async_rename_done(struct rpc_task *task, void *calldata) | |
333 | { | |
334 | struct nfs_renamedata *data = calldata; | |
335 | struct inode *old_dir = data->old_dir; | |
336 | struct inode *new_dir = data->new_dir; | |
73ca1001 | 337 | struct dentry *old_dentry = data->old_dentry; |
d3d4152a JL |
338 | |
339 | if (!NFS_PROTO(old_dir)->rename_done(task, old_dir, new_dir)) { | |
d00c5d43 | 340 | rpc_restart_call_prepare(task); |
d3d4152a JL |
341 | return; |
342 | } | |
343 | ||
5a7a613a | 344 | if (task->tk_status != 0) |
73ca1001 | 345 | nfs_cancel_async_unlink(old_dentry); |
d3d4152a JL |
346 | } |
347 | ||
348 | /** | |
349 | * nfs_async_rename_release - Release the sillyrename data. | |
350 | * @calldata: the struct nfs_renamedata to be released | |
351 | */ | |
352 | static void nfs_async_rename_release(void *calldata) | |
353 | { | |
354 | struct nfs_renamedata *data = calldata; | |
355 | struct super_block *sb = data->old_dir->i_sb; | |
356 | ||
357 | if (data->old_dentry->d_inode) | |
358 | nfs_mark_for_revalidate(data->old_dentry->d_inode); | |
359 | ||
360 | dput(data->old_dentry); | |
361 | dput(data->new_dentry); | |
362 | iput(data->old_dir); | |
363 | iput(data->new_dir); | |
364 | nfs_sb_deactive(sb); | |
365 | put_rpccred(data->cred); | |
366 | kfree(data); | |
367 | } | |
368 | ||
d3d4152a JL |
369 | static void nfs_rename_prepare(struct rpc_task *task, void *calldata) |
370 | { | |
371 | struct nfs_renamedata *data = calldata; | |
c6bfa1a1 | 372 | NFS_PROTO(data->old_dir)->rename_rpc_prepare(task, data); |
d3d4152a | 373 | } |
d3d4152a JL |
374 | |
375 | static const struct rpc_call_ops nfs_rename_ops = { | |
376 | .rpc_call_done = nfs_async_rename_done, | |
377 | .rpc_release = nfs_async_rename_release, | |
d3d4152a | 378 | .rpc_call_prepare = nfs_rename_prepare, |
d3d4152a JL |
379 | }; |
380 | ||
381 | /** | |
382 | * nfs_async_rename - perform an asynchronous rename operation | |
383 | * @old_dir: directory that currently holds the dentry to be renamed | |
384 | * @new_dir: target directory for the rename | |
385 | * @old_dentry: original dentry to be renamed | |
386 | * @new_dentry: dentry to which the old_dentry should be renamed | |
387 | * | |
388 | * It's expected that valid references to the dentries and inodes are held | |
389 | */ | |
390 | static struct rpc_task * | |
391 | nfs_async_rename(struct inode *old_dir, struct inode *new_dir, | |
392 | struct dentry *old_dentry, struct dentry *new_dentry) | |
393 | { | |
394 | struct nfs_renamedata *data; | |
395 | struct rpc_message msg = { }; | |
396 | struct rpc_task_setup task_setup_data = { | |
397 | .rpc_message = &msg, | |
398 | .callback_ops = &nfs_rename_ops, | |
399 | .workqueue = nfsiod_workqueue, | |
400 | .rpc_client = NFS_CLIENT(old_dir), | |
401 | .flags = RPC_TASK_ASYNC, | |
402 | }; | |
d3d4152a | 403 | |
dfb4f309 | 404 | data = kzalloc(sizeof(*data), GFP_KERNEL); |
d3d4152a JL |
405 | if (data == NULL) |
406 | return ERR_PTR(-ENOMEM); | |
1174dd1f | 407 | task_setup_data.callback_data = data; |
d3d4152a JL |
408 | |
409 | data->cred = rpc_lookup_cred(); | |
410 | if (IS_ERR(data->cred)) { | |
f7732d65 | 411 | struct rpc_task *task = ERR_CAST(data->cred); |
d3d4152a JL |
412 | kfree(data); |
413 | return task; | |
414 | } | |
415 | ||
416 | msg.rpc_argp = &data->args; | |
417 | msg.rpc_resp = &data->res; | |
418 | msg.rpc_cred = data->cred; | |
419 | ||
420 | /* set up nfs_renamedata */ | |
421 | data->old_dir = old_dir; | |
a4118ee1 | 422 | ihold(old_dir); |
d3d4152a | 423 | data->new_dir = new_dir; |
a4118ee1 | 424 | ihold(new_dir); |
d3d4152a JL |
425 | data->old_dentry = dget(old_dentry); |
426 | data->new_dentry = dget(new_dentry); | |
427 | nfs_fattr_init(&data->old_fattr); | |
428 | nfs_fattr_init(&data->new_fattr); | |
429 | ||
430 | /* set up nfs_renameargs */ | |
431 | data->args.old_dir = NFS_FH(old_dir); | |
432 | data->args.old_name = &old_dentry->d_name; | |
433 | data->args.new_dir = NFS_FH(new_dir); | |
434 | data->args.new_name = &new_dentry->d_name; | |
435 | ||
436 | /* set up nfs_renameres */ | |
437 | data->res.old_fattr = &data->old_fattr; | |
438 | data->res.new_fattr = &data->new_fattr; | |
439 | ||
440 | nfs_sb_active(old_dir->i_sb); | |
441 | ||
442 | NFS_PROTO(data->old_dir)->rename_setup(&msg, old_dir); | |
443 | ||
f7732d65 | 444 | return rpc_run_task(&task_setup_data); |
d3d4152a JL |
445 | } |
446 | ||
779c5179 JL |
447 | /** |
448 | * nfs_sillyrename - Perform a silly-rename of a dentry | |
449 | * @dir: inode of directory that contains dentry | |
450 | * @dentry: dentry to be sillyrenamed | |
451 | * | |
452 | * NFSv2/3 is stateless and the server doesn't know when the client is | |
453 | * holding a file open. To prevent application problems when a file is | |
454 | * unlinked while it's still open, the client performs a "silly-rename". | |
455 | * That is, it renames the file to a hidden file in the same directory, | |
456 | * and only performs the unlink once the last reference to it is put. | |
457 | * | |
458 | * The final cleanup is done during dentry_iput. | |
674e405b BF |
459 | * |
460 | * (Note: NFSv4 is stateful, and has opens, so in theory an NFSv4 server | |
461 | * could take responsibility for keeping open files referenced. The server | |
462 | * would also need to ensure that opened-but-deleted files were kept over | |
463 | * reboots. However, we may not assume a server does so. (RFC 5661 | |
464 | * does provide an OPEN4_RESULT_PRESERVE_UNLINKED flag that a server can | |
465 | * use to advertise that it does this; some day we may take advantage of | |
466 | * it.)) | |
779c5179 JL |
467 | */ |
468 | int | |
469 | nfs_sillyrename(struct inode *dir, struct dentry *dentry) | |
470 | { | |
471 | static unsigned int sillycounter; | |
472 | const int fileidsize = sizeof(NFS_FILEID(dentry->d_inode))*2; | |
473 | const int countersize = sizeof(sillycounter)*2; | |
474 | const int slen = sizeof(".nfs")+fileidsize+countersize-1; | |
475 | char silly[slen+1]; | |
779c5179 | 476 | struct dentry *sdentry; |
d3d4152a | 477 | struct rpc_task *task; |
779c5179 JL |
478 | int error = -EIO; |
479 | ||
480 | dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n", | |
481 | dentry->d_parent->d_name.name, dentry->d_name.name, | |
b7ab39f6 | 482 | dentry->d_count); |
779c5179 JL |
483 | nfs_inc_stats(dir, NFSIOS_SILLYRENAME); |
484 | ||
485 | /* | |
486 | * We don't allow a dentry to be silly-renamed twice. | |
487 | */ | |
488 | error = -EBUSY; | |
489 | if (dentry->d_flags & DCACHE_NFSFS_RENAMED) | |
490 | goto out; | |
491 | ||
492 | sprintf(silly, ".nfs%*.*Lx", | |
493 | fileidsize, fileidsize, | |
494 | (unsigned long long)NFS_FILEID(dentry->d_inode)); | |
495 | ||
496 | /* Return delegation in anticipation of the rename */ | |
57ec14c5 | 497 | NFS_PROTO(dentry->d_inode)->return_delegation(dentry->d_inode); |
779c5179 JL |
498 | |
499 | sdentry = NULL; | |
500 | do { | |
501 | char *suffix = silly + slen - countersize; | |
502 | ||
503 | dput(sdentry); | |
504 | sillycounter++; | |
505 | sprintf(suffix, "%*.*x", countersize, countersize, sillycounter); | |
506 | ||
507 | dfprintk(VFS, "NFS: trying to rename %s to %s\n", | |
508 | dentry->d_name.name, silly); | |
509 | ||
510 | sdentry = lookup_one_len(silly, dentry->d_parent, slen); | |
511 | /* | |
512 | * N.B. Better to return EBUSY here ... it could be | |
513 | * dangerous to delete the file while it's in use. | |
514 | */ | |
515 | if (IS_ERR(sdentry)) | |
516 | goto out; | |
517 | } while (sdentry->d_inode != NULL); /* need negative lookup */ | |
518 | ||
d3d4152a JL |
519 | /* queue unlink first. Can't do this from rpc_release as it |
520 | * has to allocate memory | |
521 | */ | |
522 | error = nfs_async_unlink(dir, dentry); | |
523 | if (error) | |
524 | goto out_dput; | |
525 | ||
73ca1001 JL |
526 | /* populate unlinkdata with the right dname */ |
527 | error = nfs_copy_dname(sdentry, | |
528 | (struct nfs_unlinkdata *)dentry->d_fsdata); | |
529 | if (error) { | |
530 | nfs_cancel_async_unlink(dentry); | |
531 | goto out_dput; | |
532 | } | |
533 | ||
d3d4152a JL |
534 | /* run the rename task, undo unlink if it fails */ |
535 | task = nfs_async_rename(dir, dir, dentry, sdentry); | |
536 | if (IS_ERR(task)) { | |
537 | error = -EBUSY; | |
538 | nfs_cancel_async_unlink(dentry); | |
539 | goto out_dput; | |
779c5179 | 540 | } |
d3d4152a JL |
541 | |
542 | /* wait for the RPC task to complete, unless a SIGKILL intervenes */ | |
543 | error = rpc_wait_for_completion_task(task); | |
544 | if (error == 0) | |
545 | error = task->tk_status; | |
5a7a613a TM |
546 | switch (error) { |
547 | case 0: | |
548 | /* The rename succeeded */ | |
549 | nfs_set_verifier(dentry, nfs_save_change_attribute(dir)); | |
550 | d_move(dentry, sdentry); | |
551 | break; | |
552 | case -ERESTARTSYS: | |
553 | /* The result of the rename is unknown. Play it safe by | |
554 | * forcing a new lookup */ | |
555 | d_drop(dentry); | |
556 | d_drop(sdentry); | |
557 | } | |
d3d4152a JL |
558 | rpc_put_task(task); |
559 | out_dput: | |
779c5179 JL |
560 | dput(sdentry); |
561 | out: | |
562 | return error; | |
563 | } |