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fs/9p: call vmtruncate before setattr 9p opeation
[deliverable/linux.git] / fs / 9p / vfs_inode_dotl.c
CommitLineData
53c06f4e
AK		 1/*
2 * linux/fs/9p/vfs_inode_dotl.c
3 *
4 * This file contains vfs inode ops for the 9P2000.L protocol.
5 *
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
8 *
9 * This program is free software; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License version 2
11 * as published by the Free Software Foundation.
12 *
13 * This program is distributed in the hope that it will be useful,
14 * but WITHOUT ANY WARRANTY; without even the implied warranty of
15 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 * GNU General Public License for more details.
17 *
18 * You should have received a copy of the GNU General Public License
19 * along with this program; if not, write to:
20 * Free Software Foundation
21 * 51 Franklin Street, Fifth Floor
22 * Boston, MA 02111-1301 USA
23 *
24 */
25
26#include <linux/module.h>
27#include <linux/errno.h>
28#include <linux/fs.h>
29#include <linux/file.h>
30#include <linux/pagemap.h>
31#include <linux/stat.h>
32#include <linux/string.h>
33#include <linux/inet.h>
34#include <linux/namei.h>
35#include <linux/idr.h>
36#include <linux/sched.h>
37#include <linux/slab.h>
38#include <linux/xattr.h>
39#include <linux/posix_acl.h>
40#include <net/9p/9p.h>
41#include <net/9p/client.h>
42
43#include "v9fs.h"
44#include "v9fs_vfs.h"
45#include "fid.h"
46#include "cache.h"
47#include "xattr.h"
48#include "acl.h"
49
50static int
51v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
52 dev_t rdev);
53
54/**
55 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
56 * new file system object. This checks the S_ISGID to determine the owning
57 * group of the new file system object.
58 */
59
60static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
61{
62 BUG_ON(dir_inode == NULL);
63
64 if (dir_inode->i_mode & S_ISGID) {
65 /* set_gid bit is set.*/
66 return dir_inode->i_gid;
67 }
68 return current_fsgid();
69}
70
71/**
72 * v9fs_dentry_from_dir_inode - helper function to get the dentry from
73 * dir inode.
74 *
75 */
76
77static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
78{
79 struct dentry *dentry;
80
81 spin_lock(&inode->i_lock);
82 /* Directory should have only one entry. */
83 BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
84 dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
85 spin_unlock(&inode->i_lock);
86 return dentry;
87}
88
5ffc0cb3
AK		 89static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
90 struct p9_qid *qid,
91 struct p9_fid *fid,
92 struct p9_stat_dotl *st)
93{
94 int retval;
95 unsigned long i_ino;
96 struct inode *inode;
97 struct v9fs_session_info *v9ses = sb->s_fs_info;
98
99 i_ino = v9fs_qid2ino(qid);
100 inode = iget_locked(sb, i_ino);
101 if (!inode)
102 return ERR_PTR(-ENOMEM);
103 if (!(inode->i_state & I_NEW))
104 return inode;
105 /*
106 * initialize the inode with the stat info
107 * FIXME!! we may need support for stale inodes
108 * later.
109 */
110 retval = v9fs_init_inode(v9ses, inode, st->st_mode);
111 if (retval)
112 goto error;
113
114 v9fs_stat2inode_dotl(st, inode);
115#ifdef CONFIG_9P_FSCACHE
a78ce05d 116 v9fs_fscache_set_key(inode, &st->qid);
5ffc0cb3
AK		 117 v9fs_cache_inode_get_cookie(inode);
118#endif
119 retval = v9fs_get_acl(inode, fid);
120 if (retval)
121 goto error;
122
123 unlock_new_inode(inode);
124 return inode;
125error:
126 unlock_new_inode(inode);
127 iput(inode);
128 return ERR_PTR(retval);
129
130}
131
53c06f4e 132struct inode *
a78ce05d
AK		 133v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
134 struct super_block *sb)
53c06f4e 135{
53c06f4e 136 struct p9_stat_dotl *st;
5ffc0cb3 137 struct inode *inode = NULL;
53c06f4e
AK		 138
139 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
140 if (IS_ERR(st))
141 return ERR_CAST(st);
142
5ffc0cb3 143 inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st);
53c06f4e 144 kfree(st);
5ffc0cb3 145 return inode;
53c06f4e
AK		 146}
147
148/**
149 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
150 * @dir: directory inode that is being created
151 * @dentry: dentry that is being deleted
152 * @mode: create permissions
153 * @nd: path information
154 *
155 */
156
157static int
158v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
159 struct nameidata *nd)
160{
161 int err = 0;
53c06f4e
AK		 162 gid_t gid;
163 int flags;
164 mode_t mode;
6b39f6d2 165 char *name = NULL;
53c06f4e
AK		 166 struct file *filp;
167 struct p9_qid qid;
168 struct inode *inode;
6b39f6d2
AK		 169 struct p9_fid *fid = NULL;
170 struct v9fs_inode *v9inode;
171 struct p9_fid *dfid, *ofid, *inode_fid;
172 struct v9fs_session_info *v9ses;
53c06f4e
AK		 173 struct posix_acl *pacl = NULL, *dacl = NULL;
174
175 v9ses = v9fs_inode2v9ses(dir);
176 if (nd && nd->flags & LOOKUP_OPEN)
177 flags = nd->intent.open.flags - 1;
178 else {
179 /*
180 * create call without LOOKUP_OPEN is due
181 * to mknod of regular files. So use mknod
182 * operation.
183 */
184 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
185 }
186
187 name = (char *) dentry->d_name.name;
188 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
189 "mode:0x%x\n", name, flags, omode);
190
191 dfid = v9fs_fid_lookup(dentry->d_parent);
192 if (IS_ERR(dfid)) {
193 err = PTR_ERR(dfid);
194 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
195 return err;
196 }
197
198 /* clone a fid to use for creation */
199 ofid = p9_client_walk(dfid, 0, NULL, 1);
200 if (IS_ERR(ofid)) {
201 err = PTR_ERR(ofid);
202 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
203 return err;
204 }
205
206 gid = v9fs_get_fsgid_for_create(dir);
207
208 mode = omode;
209 /* Update mode based on ACL value */
210 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
211 if (err) {
212 P9_DPRINTK(P9_DEBUG_VFS,
213 "Failed to get acl values in creat %d\n", err);
214 goto error;
215 }
216 err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
217 if (err < 0) {
218 P9_DPRINTK(P9_DEBUG_VFS,
219 "p9_client_open_dotl failed in creat %d\n",
220 err);
221 goto error;
222 }
d28c61f0 223 v9fs_invalidate_inode_attr(dir);
53c06f4e 224
af7542fc
AK		 225 /* instantiate inode and assign the unopened fid to the dentry */
226 fid = p9_client_walk(dfid, 1, &name, 1);
227 if (IS_ERR(fid)) {
228 err = PTR_ERR(fid);
c25a61f5 229 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
53c06f4e 230 fid = NULL;
af7542fc 231 goto error;
53c06f4e 232 }
a78ce05d 233 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
af7542fc
AK		 234 if (IS_ERR(inode)) {
235 err = PTR_ERR(inode);
236 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
237 goto error;
238 }
af7542fc
AK		 239 d_instantiate(dentry, inode);
240 err = v9fs_fid_add(dentry, fid);
241 if (err < 0)
242 goto error;
243
53c06f4e
AK		 244 /* Now set the ACL based on the default value */
245 v9fs_set_create_acl(dentry, dacl, pacl);
6b39f6d2
AK		 246
247 v9inode = V9FS_I(inode);
248 if (v9ses->cache && !v9inode->writeback_fid) {
3cf387d7 249 /*
6b39f6d2 250 * clone a fid and add it to writeback_fid
3cf387d7
AK		 251 * we do it during open time instead of
252 * page dirty time via write_begin/page_mkwrite
253 * because we want write after unlink usecase
254 * to work.
255 */
256 inode_fid = v9fs_writeback_fid(dentry);
257 if (IS_ERR(inode_fid)) {
258 err = PTR_ERR(inode_fid);
259 goto error;
260 }
6b39f6d2 261 v9inode->writeback_fid = (void *) inode_fid;
3cf387d7 262 }
af7542fc
AK		 263 /* Since we are opening a file, assign the open fid to the file */
264 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
265 if (IS_ERR(filp)) {
53c06f4e 266 p9_client_clunk(ofid);
af7542fc
AK		 267 return PTR_ERR(filp);
268 }
269 filp->private_data = ofid;
46848de0
AK		 270#ifdef CONFIG_9P_FSCACHE
271 if (v9ses->cache)
272 v9fs_cache_inode_set_cookie(inode, filp);
273#endif
53c06f4e
AK		 274 return 0;
275
276error:
277 if (ofid)
278 p9_client_clunk(ofid);
279 if (fid)
280 p9_client_clunk(fid);
281 return err;
282}
283
284/**
285 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
286 * @dir: inode that is being unlinked
287 * @dentry: dentry that is being unlinked
288 * @mode: mode for new directory
289 *
290 */
291
292static int v9fs_vfs_mkdir_dotl(struct inode *dir,
293 struct dentry *dentry, int omode)
294{
295 int err;
296 struct v9fs_session_info *v9ses;
297 struct p9_fid *fid = NULL, *dfid = NULL;
298 gid_t gid;
299 char *name;
300 mode_t mode;
301 struct inode *inode;
302 struct p9_qid qid;
303 struct dentry *dir_dentry;
304 struct posix_acl *dacl = NULL, *pacl = NULL;
305
306 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
307 err = 0;
308 v9ses = v9fs_inode2v9ses(dir);
309
310 omode |= S_IFDIR;
311 if (dir->i_mode & S_ISGID)
312 omode |= S_ISGID;
313
314 dir_dentry = v9fs_dentry_from_dir_inode(dir);
315 dfid = v9fs_fid_lookup(dir_dentry);
316 if (IS_ERR(dfid)) {
317 err = PTR_ERR(dfid);
318 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
319 dfid = NULL;
320 goto error;
321 }
322
323 gid = v9fs_get_fsgid_for_create(dir);
324 mode = omode;
325 /* Update mode based on ACL value */
326 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
327 if (err) {
328 P9_DPRINTK(P9_DEBUG_VFS,
329 "Failed to get acl values in mkdir %d\n", err);
330 goto error;
331 }
332 name = (char *) dentry->d_name.name;
333 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
334 if (err < 0)
335 goto error;
336
337 /* instantiate inode and assign the unopened fid to the dentry */
338 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
339 fid = p9_client_walk(dfid, 1, &name, 1);
340 if (IS_ERR(fid)) {
341 err = PTR_ERR(fid);
342 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
343 err);
344 fid = NULL;
345 goto error;
346 }
347
a78ce05d 348 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
53c06f4e
AK		 349 if (IS_ERR(inode)) {
350 err = PTR_ERR(inode);
351 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
352 err);
353 goto error;
354 }
53c06f4e
AK		 355 d_instantiate(dentry, inode);
356 err = v9fs_fid_add(dentry, fid);
357 if (err < 0)
358 goto error;
359 fid = NULL;
360 } else {
361 /*
362 * Not in cached mode. No need to populate
363 * inode with stat. We need to get an inode
364 * so that we can set the acl with dentry
365 */
366 inode = v9fs_get_inode(dir->i_sb, mode);
367 if (IS_ERR(inode)) {
368 err = PTR_ERR(inode);
369 goto error;
370 }
53c06f4e
AK		 371 d_instantiate(dentry, inode);
372 }
373 /* Now set the ACL based on the default value */
374 v9fs_set_create_acl(dentry, dacl, pacl);
b271ec47 375 inc_nlink(dir);
d28c61f0 376 v9fs_invalidate_inode_attr(dir);
53c06f4e
AK		 377error:
378 if (fid)
379 p9_client_clunk(fid);
380 return err;
381}
382
383static int
384v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
385 struct kstat *stat)
386{
387 int err;
388 struct v9fs_session_info *v9ses;
389 struct p9_fid *fid;
390 struct p9_stat_dotl *st;
391
392 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
393 err = -EPERM;
394 v9ses = v9fs_inode2v9ses(dentry->d_inode);
a1211908
AK		 395 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
396 generic_fillattr(dentry->d_inode, stat);
397 return 0;
398 }
53c06f4e
AK		 399 fid = v9fs_fid_lookup(dentry);
400 if (IS_ERR(fid))
401 return PTR_ERR(fid);
402
403 /* Ask for all the fields in stat structure. Server will return
404 * whatever it supports
405 */
406
407 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
408 if (IS_ERR(st))
409 return PTR_ERR(st);
410
411 v9fs_stat2inode_dotl(st, dentry->d_inode);
412 generic_fillattr(dentry->d_inode, stat);
413 /* Change block size to what the server returned */
414 stat->blksize = st->st_blksize;
415
416 kfree(st);
417 return 0;
418}
419
420/**
421 * v9fs_vfs_setattr_dotl - set file metadata
422 * @dentry: file whose metadata to set
423 * @iattr: metadata assignment structure
424 *
425 */
426
427int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
428{
429 int retval;
430 struct v9fs_session_info *v9ses;
431 struct p9_fid *fid;
432 struct p9_iattr_dotl p9attr;
433
434 P9_DPRINTK(P9_DEBUG_VFS, "\n");
435
436 retval = inode_change_ok(dentry->d_inode, iattr);
437 if (retval)
438 return retval;
439
440 p9attr.valid = iattr->ia_valid;
441 p9attr.mode = iattr->ia_mode;
442 p9attr.uid = iattr->ia_uid;
443 p9attr.gid = iattr->ia_gid;
444 p9attr.size = iattr->ia_size;
445 p9attr.atime_sec = iattr->ia_atime.tv_sec;
446 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
447 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
448 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
449
450 retval = -EPERM;
451 v9ses = v9fs_inode2v9ses(dentry->d_inode);
452 fid = v9fs_fid_lookup(dentry);
453 if (IS_ERR(fid))
454 return PTR_ERR(fid);
455
53c06f4e
AK		 456 if ((iattr->ia_valid & ATTR_SIZE) &&
457 iattr->ia_size != i_size_read(dentry->d_inode)) {
458 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
459 if (retval)
460 return retval;
461 }
f10fc50f
AK		 462 retval = p9_client_setattr(fid, &p9attr);
463 if (retval < 0)
464 return retval;
465 v9fs_invalidate_inode_attr(dentry->d_inode);
53c06f4e
AK		 466
467 setattr_copy(dentry->d_inode, iattr);
468 mark_inode_dirty(dentry->d_inode);
469 if (iattr->ia_valid & ATTR_MODE) {
470 /* We also want to update ACL when we update mode bits */
471 retval = v9fs_acl_chmod(dentry);
472 if (retval < 0)
473 return retval;
474 }
475 return 0;
476}
477
478/**
479 * v9fs_stat2inode_dotl - populate an inode structure with stat info
480 * @stat: stat structure
481 * @inode: inode to populate
482 * @sb: superblock of filesystem
483 *
484 */
485
486void
487v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
488{
b3cbea03 489 struct v9fs_inode *v9inode = V9FS_I(inode);
53c06f4e
AK		 490
491 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
492 inode->i_atime.tv_sec = stat->st_atime_sec;
493 inode->i_atime.tv_nsec = stat->st_atime_nsec;
494 inode->i_mtime.tv_sec = stat->st_mtime_sec;
495 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
496 inode->i_ctime.tv_sec = stat->st_ctime_sec;
497 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
498 inode->i_uid = stat->st_uid;
499 inode->i_gid = stat->st_gid;
500 inode->i_nlink = stat->st_nlink;
501 inode->i_mode = stat->st_mode;
502 inode->i_rdev = new_decode_dev(stat->st_rdev);
503
504 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
505 init_special_inode(inode, inode->i_mode, inode->i_rdev);
506
507 i_size_write(inode, stat->st_size);
508 inode->i_blocks = stat->st_blocks;
509 } else {
510 if (stat->st_result_mask & P9_STATS_ATIME) {
511 inode->i_atime.tv_sec = stat->st_atime_sec;
512 inode->i_atime.tv_nsec = stat->st_atime_nsec;
513 }
514 if (stat->st_result_mask & P9_STATS_MTIME) {
515 inode->i_mtime.tv_sec = stat->st_mtime_sec;
516 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
517 }
518 if (stat->st_result_mask & P9_STATS_CTIME) {
519 inode->i_ctime.tv_sec = stat->st_ctime_sec;
520 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
521 }
522 if (stat->st_result_mask & P9_STATS_UID)
523 inode->i_uid = stat->st_uid;
524 if (stat->st_result_mask & P9_STATS_GID)
525 inode->i_gid = stat->st_gid;
526 if (stat->st_result_mask & P9_STATS_NLINK)
527 inode->i_nlink = stat->st_nlink;
528 if (stat->st_result_mask & P9_STATS_MODE) {
529 inode->i_mode = stat->st_mode;
530 if ((S_ISBLK(inode->i_mode)) ||
531 (S_ISCHR(inode->i_mode)))
532 init_special_inode(inode, inode->i_mode,
533 inode->i_rdev);
534 }
535 if (stat->st_result_mask & P9_STATS_RDEV)
536 inode->i_rdev = new_decode_dev(stat->st_rdev);
537 if (stat->st_result_mask & P9_STATS_SIZE)
538 i_size_write(inode, stat->st_size);
539 if (stat->st_result_mask & P9_STATS_BLOCKS)
540 inode->i_blocks = stat->st_blocks;
541 }
542 if (stat->st_result_mask & P9_STATS_GEN)
543 inode->i_generation = stat->st_gen;
544
545 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
546 * because the inode structure does not have fields for them.
547 */
b3cbea03 548 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
53c06f4e
AK		 549}
550
551static int
552v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
553 const char *symname)
554{
53c06f4e
AK		 555 int err;
556 gid_t gid;
d28c61f0
AK		 557 char *name;
558 struct p9_qid qid;
559 struct inode *inode;
560 struct p9_fid *dfid;
561 struct p9_fid *fid = NULL;
562 struct v9fs_session_info *v9ses;
53c06f4e
AK		 563
564 name = (char *) dentry->d_name.name;
565 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
566 dir->i_ino, name, symname);
567 v9ses = v9fs_inode2v9ses(dir);
568
569 dfid = v9fs_fid_lookup(dentry->d_parent);
570 if (IS_ERR(dfid)) {
571 err = PTR_ERR(dfid);
572 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
573 return err;
574 }
575
576 gid = v9fs_get_fsgid_for_create(dir);
577
578 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
579 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
580
581 if (err < 0) {
582 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
583 goto error;
584 }
585
d28c61f0 586 v9fs_invalidate_inode_attr(dir);
53c06f4e
AK		 587 if (v9ses->cache) {
588 /* Now walk from the parent so we can get an unopened fid. */
589 fid = p9_client_walk(dfid, 1, &name, 1);
590 if (IS_ERR(fid)) {
591 err = PTR_ERR(fid);
592 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
593 err);
594 fid = NULL;
595 goto error;
596 }
597
598 /* instantiate inode and assign the unopened fid to dentry */
a78ce05d 599 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
53c06f4e
AK		 600 if (IS_ERR(inode)) {
601 err = PTR_ERR(inode);
602 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
603 err);
604 goto error;
605 }
53c06f4e
AK		 606 d_instantiate(dentry, inode);
607 err = v9fs_fid_add(dentry, fid);
608 if (err < 0)
609 goto error;
610 fid = NULL;
611 } else {
612 /* Not in cached mode. No need to populate inode with stat */
613 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
614 if (IS_ERR(inode)) {
615 err = PTR_ERR(inode);
616 goto error;
617 }
53c06f4e
AK		 618 d_instantiate(dentry, inode);
619 }
620
621error:
622 if (fid)
623 p9_client_clunk(fid);
624
625 return err;
626}
627
628/**
629 * v9fs_vfs_link_dotl - create a hardlink for dotl
630 * @old_dentry: dentry for file to link to
631 * @dir: inode destination for new link
632 * @dentry: dentry for link
633 *
634 */
635
636static int
637v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
638 struct dentry *dentry)
639{
640 int err;
53c06f4e 641 char *name;
53c06f4e 642 struct dentry *dir_dentry;
d28c61f0
AK		 643 struct p9_fid *dfid, *oldfid;
644 struct v9fs_session_info *v9ses;
53c06f4e
AK		 645
646 P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
647 dir->i_ino, old_dentry->d_name.name,
648 dentry->d_name.name);
649
650 v9ses = v9fs_inode2v9ses(dir);
651 dir_dentry = v9fs_dentry_from_dir_inode(dir);
652 dfid = v9fs_fid_lookup(dir_dentry);
653 if (IS_ERR(dfid))
654 return PTR_ERR(dfid);
655
656 oldfid = v9fs_fid_lookup(old_dentry);
657 if (IS_ERR(oldfid))
658 return PTR_ERR(oldfid);
659
660 name = (char *) dentry->d_name.name;
661
662 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
663
664 if (err < 0) {
665 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
666 return err;
667 }
668
d28c61f0 669 v9fs_invalidate_inode_attr(dir);
53c06f4e
AK		 670 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
671 /* Get the latest stat info from server. */
672 struct p9_fid *fid;
53c06f4e
AK		 673 fid = v9fs_fid_lookup(old_dentry);
674 if (IS_ERR(fid))
675 return PTR_ERR(fid);
676
c06c066a 677 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
53c06f4e 678 }
20656a49 679 ihold(old_dentry->d_inode);
53c06f4e
AK		 680 d_instantiate(dentry, old_dentry->d_inode);
681
682 return err;
683}
684
685/**
686 * v9fs_vfs_mknod_dotl - create a special file
687 * @dir: inode destination for new link
688 * @dentry: dentry for file
689 * @mode: mode for creation
690 * @rdev: device associated with special file
691 *
692 */
693static int
694v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
695 dev_t rdev)
696{
697 int err;
d28c61f0 698 gid_t gid;
53c06f4e
AK		 699 char *name;
700 mode_t mode;
701 struct v9fs_session_info *v9ses;
702 struct p9_fid *fid = NULL, *dfid = NULL;
703 struct inode *inode;
53c06f4e
AK		 704 struct p9_qid qid;
705 struct dentry *dir_dentry;
706 struct posix_acl *dacl = NULL, *pacl = NULL;
707
708 P9_DPRINTK(P9_DEBUG_VFS,
709 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
710 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
711
712 if (!new_valid_dev(rdev))
713 return -EINVAL;
714
715 v9ses = v9fs_inode2v9ses(dir);
716 dir_dentry = v9fs_dentry_from_dir_inode(dir);
717 dfid = v9fs_fid_lookup(dir_dentry);
718 if (IS_ERR(dfid)) {
719 err = PTR_ERR(dfid);
720 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
721 dfid = NULL;
722 goto error;
723 }
724
725 gid = v9fs_get_fsgid_for_create(dir);
726 mode = omode;
727 /* Update mode based on ACL value */
728 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
729 if (err) {
730 P9_DPRINTK(P9_DEBUG_VFS,
731 "Failed to get acl values in mknod %d\n", err);
732 goto error;
733 }
734 name = (char *) dentry->d_name.name;
735
736 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
737 if (err < 0)
738 goto error;
739
d28c61f0 740 v9fs_invalidate_inode_attr(dir);
53c06f4e
AK		 741 /* instantiate inode and assign the unopened fid to the dentry */
742 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
743 fid = p9_client_walk(dfid, 1, &name, 1);
744 if (IS_ERR(fid)) {
745 err = PTR_ERR(fid);
746 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
747 err);
748 fid = NULL;
749 goto error;
750 }
751
a78ce05d 752 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
53c06f4e
AK		 753 if (IS_ERR(inode)) {
754 err = PTR_ERR(inode);
755 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
756 err);
757 goto error;
758 }
53c06f4e
AK		 759 d_instantiate(dentry, inode);
760 err = v9fs_fid_add(dentry, fid);
761 if (err < 0)
762 goto error;
763 fid = NULL;
764 } else {
765 /*
766 * Not in cached mode. No need to populate inode with stat.
767 * socket syscall returns a fd, so we need instantiate
768 */
769 inode = v9fs_get_inode(dir->i_sb, mode);
770 if (IS_ERR(inode)) {
771 err = PTR_ERR(inode);
772 goto error;
773 }
53c06f4e
AK		 774 d_instantiate(dentry, inode);
775 }
776 /* Now set the ACL based on the default value */
777 v9fs_set_create_acl(dentry, dacl, pacl);
778error:
779 if (fid)
780 p9_client_clunk(fid);
781 return err;
782}
783
53c06f4e
AK		 784/**
785 * v9fs_vfs_follow_link_dotl - follow a symlink path
786 * @dentry: dentry for symlink
787 * @nd: nameidata
788 *
789 */
790
791static void *
792v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
793{
31b6ceac
MK		 794 int retval;
795 struct p9_fid *fid;
53c06f4e 796 char *link = __getname();
31b6ceac 797 char *target;
53c06f4e 798
31b6ceac 799 P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
53c06f4e 800
31b6ceac 801 if (!link) {
53c06f4e 802 link = ERR_PTR(-ENOMEM);
31b6ceac 803 goto ndset;
53c06f4e 804 }
31b6ceac
MK		 805 fid = v9fs_fid_lookup(dentry);
806 if (IS_ERR(fid)) {
807 __putname(link);
808 link = ERR_PTR(PTR_ERR(fid));
809 goto ndset;
810 }
811 retval = p9_client_readlink(fid, &target);
812 if (!retval) {
813 strcpy(link, target);
814 kfree(target);
815 goto ndset;
816 }
817 __putname(link);
818 link = ERR_PTR(retval);
819ndset:
53c06f4e 820 nd_set_link(nd, link);
53c06f4e
AK		 821 return NULL;
822}
823
b3cbea03
AK		 824int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
825{
826 loff_t i_size;
827 struct p9_stat_dotl *st;
828 struct v9fs_session_info *v9ses;
829
830 v9ses = v9fs_inode2v9ses(inode);
831 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
832 if (IS_ERR(st))
833 return PTR_ERR(st);
834
835 spin_lock(&inode->i_lock);
836 /*
837 * We don't want to refresh inode->i_size,
838 * because we may have cached data
839 */
840 i_size = inode->i_size;
841 v9fs_stat2inode_dotl(st, inode);
842 if (v9ses->cache)
843 inode->i_size = i_size;
844 spin_unlock(&inode->i_lock);
845 kfree(st);
846 return 0;
847}
848
53c06f4e
AK		 849const struct inode_operations v9fs_dir_inode_operations_dotl = {
850 .create = v9fs_vfs_create_dotl,
851 .lookup = v9fs_vfs_lookup,
852 .link = v9fs_vfs_link_dotl,
853 .symlink = v9fs_vfs_symlink_dotl,
854 .unlink = v9fs_vfs_unlink,
855 .mkdir = v9fs_vfs_mkdir_dotl,
856 .rmdir = v9fs_vfs_rmdir,
857 .mknod = v9fs_vfs_mknod_dotl,
858 .rename = v9fs_vfs_rename,
859 .getattr = v9fs_vfs_getattr_dotl,
860 .setattr = v9fs_vfs_setattr_dotl,
861 .setxattr = generic_setxattr,
862 .getxattr = generic_getxattr,
863 .removexattr = generic_removexattr,
864 .listxattr = v9fs_listxattr,
865 .check_acl = v9fs_check_acl,
866};
867
868const struct inode_operations v9fs_file_inode_operations_dotl = {
869 .getattr = v9fs_vfs_getattr_dotl,
870 .setattr = v9fs_vfs_setattr_dotl,
871 .setxattr = generic_setxattr,
872 .getxattr = generic_getxattr,
873 .removexattr = generic_removexattr,
874 .listxattr = v9fs_listxattr,
875 .check_acl = v9fs_check_acl,
876};
877
878const struct inode_operations v9fs_symlink_inode_operations_dotl = {
31b6ceac 879 .readlink = generic_readlink,
53c06f4e
AK		 880 .follow_link = v9fs_vfs_follow_link_dotl,
881 .put_link = v9fs_vfs_put_link,
882 .getattr = v9fs_vfs_getattr_dotl,
883 .setattr = v9fs_vfs_setattr_dotl,
884 .setxattr = generic_setxattr,
885 .getxattr = generic_getxattr,
886 .removexattr = generic_removexattr,
887 .listxattr = v9fs_listxattr,
888};
Linux kernel - Deliverables
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