blob: 8d6864c2a5fa07623e484953e709944c3245cbeb [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/nfs/unlink.c
3 *
4 * nfs sillydelete handling
5 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 */
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>
Linus Torvaldsb35e7042007-10-19 19:59:18 -070014#include <linux/sched.h>
15#include <linux/wait.h>
Jeff Layton779c5172010-09-17 17:31:30 -040016#include <linux/namei.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017
Steve Dicksonef818a22007-11-08 04:05:04 -050018#include "internal.h"
Andy Adamson472cfbd2009-04-01 09:22:24 -040019#include "nfs4_fs.h"
Jeff Layton779c5172010-09-17 17:31:30 -040020#include "iostat.h"
21#include "delegation.h"
Steve Dicksonef818a22007-11-08 04:05:04 -050022
Linus Torvalds1da177e2005-04-16 15:20:36 -070023struct nfs_unlinkdata {
Trond Myklebust565277f2007-10-15 18:17:53 -040024 struct hlist_node list;
Trond Myklebuste4eff1a2007-07-14 15:39:58 -040025 struct nfs_removeargs args;
26 struct nfs_removeres res;
27 struct inode *dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -070028 struct rpc_cred *cred;
Trond Myklebustd3468902010-04-16 16:22:50 -040029 struct nfs_fattr dir_attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -070030};
31
Linus Torvalds1da177e2005-04-16 15:20:36 -070032/**
Trond Myklebuste4eff1a2007-07-14 15:39:58 -040033 * nfs_free_unlinkdata - release data from a sillydelete operation.
Linus Torvalds1da177e2005-04-16 15:20:36 -070034 * @data: pointer to unlink structure.
35 */
36static void
Trond Myklebuste4eff1a2007-07-14 15:39:58 -040037nfs_free_unlinkdata(struct nfs_unlinkdata *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -070038{
Trond Myklebuste4eff1a2007-07-14 15:39:58 -040039 iput(data->dir);
40 put_rpccred(data->cred);
41 kfree(data->args.name.name);
42 kfree(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -070043}
44
45#define NAME_ALLOC_LEN(len) ((len+16) & ~15)
46/**
47 * nfs_copy_dname - copy dentry name to data structure
48 * @dentry: pointer to dentry
49 * @data: nfs_unlinkdata
50 */
Trond Myklebuste4eff1a2007-07-14 15:39:58 -040051static int nfs_copy_dname(struct dentry *dentry, struct nfs_unlinkdata *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -070052{
53 char *str;
54 int len = dentry->d_name.len;
55
Trond Myklebuste4eff1a2007-07-14 15:39:58 -040056 str = kmemdup(dentry->d_name.name, NAME_ALLOC_LEN(len), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 if (!str)
Trond Myklebuste4eff1a2007-07-14 15:39:58 -040058 return -ENOMEM;
59 data->args.name.len = len;
60 data->args.name.name = str;
61 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070062}
63
Trond Myklebust565277f2007-10-15 18:17:53 -040064static void nfs_free_dname(struct nfs_unlinkdata *data)
65{
66 kfree(data->args.name.name);
67 data->args.name.name = NULL;
68 data->args.name.len = 0;
69}
70
71static void nfs_dec_sillycount(struct inode *dir)
72{
73 struct nfs_inode *nfsi = NFS_I(dir);
74 if (atomic_dec_return(&nfsi->silly_count) == 1)
75 wake_up(&nfsi->waitqueue);
76}
77
Linus Torvalds1da177e2005-04-16 15:20:36 -070078/**
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 * nfs_async_unlink_done - Sillydelete post-processing
80 * @task: rpc_task of the sillydelete
81 *
82 * Do the directory attribute update.
83 */
Trond Myklebust963d8fe2006-01-03 09:55:04 +010084static void nfs_async_unlink_done(struct rpc_task *task, void *calldata)
Linus Torvalds1da177e2005-04-16 15:20:36 -070085{
Trond Myklebuste4eff1a2007-07-14 15:39:58 -040086 struct nfs_unlinkdata *data = calldata;
87 struct inode *dir = data->dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
Trond Myklebuste4eff1a2007-07-14 15:39:58 -040089 if (!NFS_PROTO(dir)->unlink_done(task, dir))
Trond Myklebust0110ee12009-12-07 09:00:24 -050090 nfs_restart_rpc(task, NFS_SERVER(dir)->nfs_client);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091}
92
93/**
94 * nfs_async_unlink_release - Release the sillydelete data.
95 * @task: rpc_task of the sillydelete
96 *
97 * We need to call nfs_put_unlinkdata as a 'tk_release' task since the
98 * rpc_task would be freed too.
99 */
Trond Myklebust963d8fe2006-01-03 09:55:04 +0100100static void nfs_async_unlink_release(void *calldata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
Trond Myklebust963d8fe2006-01-03 09:55:04 +0100102 struct nfs_unlinkdata *data = calldata;
Trond Myklebust744d18d2008-07-27 18:03:19 -0400103 struct super_block *sb = data->dir->i_sb;
Trond Myklebust565277f2007-10-15 18:17:53 -0400104
105 nfs_dec_sillycount(data->dir);
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400106 nfs_free_unlinkdata(data);
Trond Myklebust1daef0a2008-07-27 18:19:01 -0400107 nfs_sb_deactive(sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108}
109
Andy Adamson472cfbd2009-04-01 09:22:24 -0400110#if defined(CONFIG_NFS_V4_1)
111void nfs_unlink_prepare(struct rpc_task *task, void *calldata)
112{
113 struct nfs_unlinkdata *data = calldata;
114 struct nfs_server *server = NFS_SERVER(data->dir);
115
Trond Myklebust035168a2010-06-16 09:52:26 -0400116 if (nfs4_setup_sequence(server, &data->args.seq_args,
Andy Adamson472cfbd2009-04-01 09:22:24 -0400117 &data->res.seq_res, 1, task))
118 return;
119 rpc_call_start(task);
120}
121#endif /* CONFIG_NFS_V4_1 */
122
Trond Myklebust963d8fe2006-01-03 09:55:04 +0100123static const struct rpc_call_ops nfs_unlink_ops = {
124 .rpc_call_done = nfs_async_unlink_done,
125 .rpc_release = nfs_async_unlink_release,
Andy Adamson472cfbd2009-04-01 09:22:24 -0400126#if defined(CONFIG_NFS_V4_1)
127 .rpc_call_prepare = nfs_unlink_prepare,
128#endif /* CONFIG_NFS_V4_1 */
Trond Myklebust963d8fe2006-01-03 09:55:04 +0100129};
130
Trond Myklebust565277f2007-10-15 18:17:53 -0400131static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct nfs_unlinkdata *data)
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400132{
Trond Myklebust5138fde2007-07-14 15:40:01 -0400133 struct rpc_message msg = {
134 .rpc_argp = &data->args,
135 .rpc_resp = &data->res,
136 .rpc_cred = data->cred,
137 };
Trond Myklebustc970aa82007-07-14 15:39:59 -0400138 struct rpc_task_setup task_setup_data = {
Trond Myklebust5138fde2007-07-14 15:40:01 -0400139 .rpc_message = &msg,
Trond Myklebustc970aa82007-07-14 15:39:59 -0400140 .callback_ops = &nfs_unlink_ops,
141 .callback_data = data,
Trond Myklebust1daef0a2008-07-27 18:19:01 -0400142 .workqueue = nfsiod_workqueue,
Trond Myklebustc970aa82007-07-14 15:39:59 -0400143 .flags = RPC_TASK_ASYNC,
144 };
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400145 struct rpc_task *task;
Trond Myklebust565277f2007-10-15 18:17:53 -0400146 struct dentry *alias;
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400147
Trond Myklebust565277f2007-10-15 18:17:53 -0400148 alias = d_lookup(parent, &data->args.name);
149 if (alias != NULL) {
150 int ret = 0;
Al Virob1942c52011-03-16 05:44:14 -0400151 void *devname_garbage = NULL;
Trond Myklebust609005c32008-01-28 19:42:59 -0500152
Trond Myklebust565277f2007-10-15 18:17:53 -0400153 /*
154 * Hey, we raced with lookup... See if we need to transfer
155 * the sillyrename information to the aliased dentry.
156 */
157 nfs_free_dname(data);
158 spin_lock(&alias->d_lock);
Trond Myklebust609005c32008-01-28 19:42:59 -0500159 if (alias->d_inode != NULL &&
160 !(alias->d_flags & DCACHE_NFSFS_RENAMED)) {
Al Virob1942c52011-03-16 05:44:14 -0400161 devname_garbage = alias->d_fsdata;
Trond Myklebust565277f2007-10-15 18:17:53 -0400162 alias->d_fsdata = data;
Trond Myklebustfccca7f2008-01-26 17:37:47 -0500163 alias->d_flags |= DCACHE_NFSFS_RENAMED;
Trond Myklebust565277f2007-10-15 18:17:53 -0400164 ret = 1;
165 }
166 spin_unlock(&alias->d_lock);
167 nfs_dec_sillycount(dir);
168 dput(alias);
Al Virob1942c52011-03-16 05:44:14 -0400169 /*
170 * If we'd displaced old cached devname, free it. At that
171 * point dentry is definitely not a root, so we won't need
172 * that anymore.
173 */
174 if (devname_garbage)
175 kfree(devname_garbage);
Trond Myklebust565277f2007-10-15 18:17:53 -0400176 return ret;
177 }
178 data->dir = igrab(dir);
179 if (!data->dir) {
180 nfs_dec_sillycount(dir);
181 return 0;
182 }
Trond Myklebust1daef0a2008-07-27 18:19:01 -0400183 nfs_sb_active(dir->i_sb);
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400184 data->args.fh = NFS_FH(dir);
Trond Myklebustd3468902010-04-16 16:22:50 -0400185 nfs_fattr_init(data->res.dir_attr);
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400186
Trond Myklebust5138fde2007-07-14 15:40:01 -0400187 NFS_PROTO(dir)->unlink_setup(&msg, dir);
Trond Myklebustc970aa82007-07-14 15:39:59 -0400188
Trond Myklebust5138fde2007-07-14 15:40:01 -0400189 task_setup_data.rpc_client = NFS_CLIENT(dir);
Trond Myklebustc970aa82007-07-14 15:39:59 -0400190 task = rpc_run_task(&task_setup_data);
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400191 if (!IS_ERR(task))
Trond Myklebustbf294b42011-02-21 11:05:41 -0800192 rpc_put_task_async(task);
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400193 return 1;
Trond Myklebust565277f2007-10-15 18:17:53 -0400194}
195
196static int nfs_call_unlink(struct dentry *dentry, struct nfs_unlinkdata *data)
197{
198 struct dentry *parent;
199 struct inode *dir;
200 int ret = 0;
201
202
203 parent = dget_parent(dentry);
204 if (parent == NULL)
205 goto out_free;
206 dir = parent->d_inode;
Trond Myklebust55b70a02007-10-21 12:02:22 -0400207 if (nfs_copy_dname(dentry, data) != 0)
Trond Myklebust565277f2007-10-15 18:17:53 -0400208 goto out_dput;
209 /* Non-exclusive lock protects against concurrent lookup() calls */
210 spin_lock(&dir->i_lock);
211 if (atomic_inc_not_zero(&NFS_I(dir)->silly_count) == 0) {
212 /* Deferred delete */
213 hlist_add_head(&data->list, &NFS_I(dir)->silly_list);
214 spin_unlock(&dir->i_lock);
215 ret = 1;
216 goto out_dput;
217 }
218 spin_unlock(&dir->i_lock);
219 ret = nfs_do_call_unlink(parent, dir, data);
220out_dput:
221 dput(parent);
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400222out_free:
Trond Myklebust565277f2007-10-15 18:17:53 -0400223 return ret;
224}
225
226void nfs_block_sillyrename(struct dentry *dentry)
227{
228 struct nfs_inode *nfsi = NFS_I(dentry->d_inode);
229
230 wait_event(nfsi->waitqueue, atomic_cmpxchg(&nfsi->silly_count, 1, 0) == 1);
231}
232
233void nfs_unblock_sillyrename(struct dentry *dentry)
234{
235 struct inode *dir = dentry->d_inode;
236 struct nfs_inode *nfsi = NFS_I(dir);
237 struct nfs_unlinkdata *data;
238
239 atomic_inc(&nfsi->silly_count);
240 spin_lock(&dir->i_lock);
241 while (!hlist_empty(&nfsi->silly_list)) {
242 if (!atomic_inc_not_zero(&nfsi->silly_count))
243 break;
244 data = hlist_entry(nfsi->silly_list.first, struct nfs_unlinkdata, list);
245 hlist_del(&data->list);
246 spin_unlock(&dir->i_lock);
247 if (nfs_do_call_unlink(dentry, dir, data) == 0)
248 nfs_free_unlinkdata(data);
249 spin_lock(&dir->i_lock);
250 }
251 spin_unlock(&dir->i_lock);
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400252}
253
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254/**
255 * nfs_async_unlink - asynchronous unlinking of a file
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400256 * @dir: parent directory of dentry
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 * @dentry: dentry to unlink
258 */
Jeff Layton779c5172010-09-17 17:31:30 -0400259static int
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400260nfs_async_unlink(struct inode *dir, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261{
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400262 struct nfs_unlinkdata *data;
263 int status = -ENOMEM;
Al Virob1942c52011-03-16 05:44:14 -0400264 void *devname_garbage = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265
Eric Sesterhennbd647542006-03-20 13:44:10 -0500266 data = kzalloc(sizeof(*data), GFP_KERNEL);
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400267 if (data == NULL)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269
Trond Myklebust98a8e322008-03-12 12:25:28 -0400270 data->cred = rpc_lookup_cred();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 if (IS_ERR(data->cred)) {
272 status = PTR_ERR(data->cred);
273 goto out_free;
274 }
Trond Myklebustd3468902010-04-16 16:22:50 -0400275 data->res.dir_attr = &data->dir_attr;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400277 status = -EBUSY;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 spin_lock(&dentry->d_lock);
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400279 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
280 goto out_unlock;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 dentry->d_flags |= DCACHE_NFSFS_RENAMED;
Al Virob1942c52011-03-16 05:44:14 -0400282 devname_garbage = dentry->d_fsdata;
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400283 dentry->d_fsdata = data;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284 spin_unlock(&dentry->d_lock);
Al Virob1942c52011-03-16 05:44:14 -0400285 /*
286 * If we'd displaced old cached devname, free it. At that
287 * point dentry is definitely not a root, so we won't need
288 * that anymore.
289 */
290 if (devname_garbage)
291 kfree(devname_garbage);
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400292 return 0;
293out_unlock:
294 spin_unlock(&dentry->d_lock);
295 put_rpccred(data->cred);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296out_free:
297 kfree(data);
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400298out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 return status;
300}
301
302/**
303 * nfs_complete_unlink - Initialize completion of the sillydelete
304 * @dentry: dentry to delete
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400305 * @inode: inode
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 *
307 * Since we're most likely to be called by dentry_iput(), we
308 * only use the dentry to find the sillydelete. We then copy the name
309 * into the qstr.
310 */
311void
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400312nfs_complete_unlink(struct dentry *dentry, struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313{
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400314 struct nfs_unlinkdata *data = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316 spin_lock(&dentry->d_lock);
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400317 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
318 dentry->d_flags &= ~DCACHE_NFSFS_RENAMED;
319 data = dentry->d_fsdata;
Al Virob1942c52011-03-16 05:44:14 -0400320 dentry->d_fsdata = NULL;
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400321 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 spin_unlock(&dentry->d_lock);
Trond Myklebuste4eff1a2007-07-14 15:39:58 -0400323
324 if (data != NULL && (NFS_STALE(inode) || !nfs_call_unlink(dentry, data)))
325 nfs_free_unlinkdata(data);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326}
Jeff Layton779c5172010-09-17 17:31:30 -0400327
Jeff Laytond3d41522010-09-17 17:31:57 -0400328/* Cancel a queued async unlink. Called when a sillyrename run fails. */
329static void
330nfs_cancel_async_unlink(struct dentry *dentry)
331{
332 spin_lock(&dentry->d_lock);
333 if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
334 struct nfs_unlinkdata *data = dentry->d_fsdata;
335
336 dentry->d_flags &= ~DCACHE_NFSFS_RENAMED;
Al Virob1942c52011-03-16 05:44:14 -0400337 dentry->d_fsdata = NULL;
Jeff Laytond3d41522010-09-17 17:31:57 -0400338 spin_unlock(&dentry->d_lock);
339 nfs_free_unlinkdata(data);
340 return;
341 }
342 spin_unlock(&dentry->d_lock);
343}
344
345struct nfs_renamedata {
346 struct nfs_renameargs args;
347 struct nfs_renameres res;
348 struct rpc_cred *cred;
349 struct inode *old_dir;
350 struct dentry *old_dentry;
351 struct nfs_fattr old_fattr;
352 struct inode *new_dir;
353 struct dentry *new_dentry;
354 struct nfs_fattr new_fattr;
355};
356
357/**
358 * nfs_async_rename_done - Sillyrename post-processing
359 * @task: rpc_task of the sillyrename
360 * @calldata: nfs_renamedata for the sillyrename
361 *
362 * Do the directory attribute updates and the d_move
363 */
364static void nfs_async_rename_done(struct rpc_task *task, void *calldata)
365{
366 struct nfs_renamedata *data = calldata;
367 struct inode *old_dir = data->old_dir;
368 struct inode *new_dir = data->new_dir;
369
370 if (!NFS_PROTO(old_dir)->rename_done(task, old_dir, new_dir)) {
371 nfs_restart_rpc(task, NFS_SERVER(old_dir)->nfs_client);
372 return;
373 }
374
375 if (task->tk_status != 0) {
376 nfs_cancel_async_unlink(data->old_dentry);
377 return;
378 }
379
380 nfs_set_verifier(data->old_dentry, nfs_save_change_attribute(old_dir));
381 d_move(data->old_dentry, data->new_dentry);
382}
383
384/**
385 * nfs_async_rename_release - Release the sillyrename data.
386 * @calldata: the struct nfs_renamedata to be released
387 */
388static void nfs_async_rename_release(void *calldata)
389{
390 struct nfs_renamedata *data = calldata;
391 struct super_block *sb = data->old_dir->i_sb;
392
393 if (data->old_dentry->d_inode)
394 nfs_mark_for_revalidate(data->old_dentry->d_inode);
395
396 dput(data->old_dentry);
397 dput(data->new_dentry);
398 iput(data->old_dir);
399 iput(data->new_dir);
400 nfs_sb_deactive(sb);
401 put_rpccred(data->cred);
402 kfree(data);
403}
404
405#if defined(CONFIG_NFS_V4_1)
406static void nfs_rename_prepare(struct rpc_task *task, void *calldata)
407{
408 struct nfs_renamedata *data = calldata;
409 struct nfs_server *server = NFS_SERVER(data->old_dir);
410
411 if (nfs4_setup_sequence(server, &data->args.seq_args,
412 &data->res.seq_res, 1, task))
413 return;
414 rpc_call_start(task);
415}
416#endif /* CONFIG_NFS_V4_1 */
417
418static const struct rpc_call_ops nfs_rename_ops = {
419 .rpc_call_done = nfs_async_rename_done,
420 .rpc_release = nfs_async_rename_release,
421#if defined(CONFIG_NFS_V4_1)
422 .rpc_call_prepare = nfs_rename_prepare,
423#endif /* CONFIG_NFS_V4_1 */
424};
425
426/**
427 * nfs_async_rename - perform an asynchronous rename operation
428 * @old_dir: directory that currently holds the dentry to be renamed
429 * @new_dir: target directory for the rename
430 * @old_dentry: original dentry to be renamed
431 * @new_dentry: dentry to which the old_dentry should be renamed
432 *
433 * It's expected that valid references to the dentries and inodes are held
434 */
435static struct rpc_task *
436nfs_async_rename(struct inode *old_dir, struct inode *new_dir,
437 struct dentry *old_dentry, struct dentry *new_dentry)
438{
439 struct nfs_renamedata *data;
440 struct rpc_message msg = { };
441 struct rpc_task_setup task_setup_data = {
442 .rpc_message = &msg,
443 .callback_ops = &nfs_rename_ops,
444 .workqueue = nfsiod_workqueue,
445 .rpc_client = NFS_CLIENT(old_dir),
446 .flags = RPC_TASK_ASYNC,
447 };
Jeff Laytond3d41522010-09-17 17:31:57 -0400448
Benny Halevydfb4f3092010-09-24 09:17:01 -0400449 data = kzalloc(sizeof(*data), GFP_KERNEL);
Jeff Laytond3d41522010-09-17 17:31:57 -0400450 if (data == NULL)
451 return ERR_PTR(-ENOMEM);
Trond Myklebust1174dd12010-12-21 10:52:24 -0500452 task_setup_data.callback_data = data;
Jeff Laytond3d41522010-09-17 17:31:57 -0400453
454 data->cred = rpc_lookup_cred();
455 if (IS_ERR(data->cred)) {
Trond Myklebustf7732d62010-09-21 16:52:40 -0400456 struct rpc_task *task = ERR_CAST(data->cred);
Jeff Laytond3d41522010-09-17 17:31:57 -0400457 kfree(data);
458 return task;
459 }
460
461 msg.rpc_argp = &data->args;
462 msg.rpc_resp = &data->res;
463 msg.rpc_cred = data->cred;
464
465 /* set up nfs_renamedata */
466 data->old_dir = old_dir;
Al Viroa4118ee2010-10-27 11:00:08 -0400467 ihold(old_dir);
Jeff Laytond3d41522010-09-17 17:31:57 -0400468 data->new_dir = new_dir;
Al Viroa4118ee2010-10-27 11:00:08 -0400469 ihold(new_dir);
Jeff Laytond3d41522010-09-17 17:31:57 -0400470 data->old_dentry = dget(old_dentry);
471 data->new_dentry = dget(new_dentry);
472 nfs_fattr_init(&data->old_fattr);
473 nfs_fattr_init(&data->new_fattr);
474
475 /* set up nfs_renameargs */
476 data->args.old_dir = NFS_FH(old_dir);
477 data->args.old_name = &old_dentry->d_name;
478 data->args.new_dir = NFS_FH(new_dir);
479 data->args.new_name = &new_dentry->d_name;
480
481 /* set up nfs_renameres */
482 data->res.old_fattr = &data->old_fattr;
483 data->res.new_fattr = &data->new_fattr;
484
485 nfs_sb_active(old_dir->i_sb);
486
487 NFS_PROTO(data->old_dir)->rename_setup(&msg, old_dir);
488
Trond Myklebustf7732d62010-09-21 16:52:40 -0400489 return rpc_run_task(&task_setup_data);
Jeff Laytond3d41522010-09-17 17:31:57 -0400490}
491
Jeff Layton779c5172010-09-17 17:31:30 -0400492/**
493 * nfs_sillyrename - Perform a silly-rename of a dentry
494 * @dir: inode of directory that contains dentry
495 * @dentry: dentry to be sillyrenamed
496 *
497 * NFSv2/3 is stateless and the server doesn't know when the client is
498 * holding a file open. To prevent application problems when a file is
499 * unlinked while it's still open, the client performs a "silly-rename".
500 * That is, it renames the file to a hidden file in the same directory,
501 * and only performs the unlink once the last reference to it is put.
502 *
503 * The final cleanup is done during dentry_iput.
504 */
505int
506nfs_sillyrename(struct inode *dir, struct dentry *dentry)
507{
508 static unsigned int sillycounter;
509 const int fileidsize = sizeof(NFS_FILEID(dentry->d_inode))*2;
510 const int countersize = sizeof(sillycounter)*2;
511 const int slen = sizeof(".nfs")+fileidsize+countersize-1;
512 char silly[slen+1];
Jeff Layton779c5172010-09-17 17:31:30 -0400513 struct dentry *sdentry;
Jeff Laytond3d41522010-09-17 17:31:57 -0400514 struct rpc_task *task;
Jeff Layton779c5172010-09-17 17:31:30 -0400515 int error = -EIO;
516
517 dfprintk(VFS, "NFS: silly-rename(%s/%s, ct=%d)\n",
518 dentry->d_parent->d_name.name, dentry->d_name.name,
Nick Pigginb7ab39f2011-01-07 17:49:32 +1100519 dentry->d_count);
Jeff Layton779c5172010-09-17 17:31:30 -0400520 nfs_inc_stats(dir, NFSIOS_SILLYRENAME);
521
522 /*
523 * We don't allow a dentry to be silly-renamed twice.
524 */
525 error = -EBUSY;
526 if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
527 goto out;
528
529 sprintf(silly, ".nfs%*.*Lx",
530 fileidsize, fileidsize,
531 (unsigned long long)NFS_FILEID(dentry->d_inode));
532
533 /* Return delegation in anticipation of the rename */
534 nfs_inode_return_delegation(dentry->d_inode);
535
536 sdentry = NULL;
537 do {
538 char *suffix = silly + slen - countersize;
539
540 dput(sdentry);
541 sillycounter++;
542 sprintf(suffix, "%*.*x", countersize, countersize, sillycounter);
543
544 dfprintk(VFS, "NFS: trying to rename %s to %s\n",
545 dentry->d_name.name, silly);
546
547 sdentry = lookup_one_len(silly, dentry->d_parent, slen);
548 /*
549 * N.B. Better to return EBUSY here ... it could be
550 * dangerous to delete the file while it's in use.
551 */
552 if (IS_ERR(sdentry))
553 goto out;
554 } while (sdentry->d_inode != NULL); /* need negative lookup */
555
Jeff Laytond3d41522010-09-17 17:31:57 -0400556 /* queue unlink first. Can't do this from rpc_release as it
557 * has to allocate memory
558 */
559 error = nfs_async_unlink(dir, dentry);
560 if (error)
561 goto out_dput;
562
563 /* run the rename task, undo unlink if it fails */
564 task = nfs_async_rename(dir, dir, dentry, sdentry);
565 if (IS_ERR(task)) {
566 error = -EBUSY;
567 nfs_cancel_async_unlink(dentry);
568 goto out_dput;
Jeff Layton779c5172010-09-17 17:31:30 -0400569 }
Jeff Laytond3d41522010-09-17 17:31:57 -0400570
571 /* wait for the RPC task to complete, unless a SIGKILL intervenes */
572 error = rpc_wait_for_completion_task(task);
573 if (error == 0)
574 error = task->tk_status;
575 rpc_put_task(task);
576out_dput:
Jeff Layton779c5172010-09-17 17:31:30 -0400577 dput(sdentry);
578out:
579 return error;
580}