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Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi...
[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 }
3dc5436a
AK		 462 /* Write all dirty data */
463 if (S_ISREG(dentry->d_inode->i_mode))
464 filemap_write_and_wait(dentry->d_inode->i_mapping);
465
f10fc50f
AK		 466 retval = p9_client_setattr(fid, &p9attr);
467 if (retval < 0)
468 return retval;
469 v9fs_invalidate_inode_attr(dentry->d_inode);
53c06f4e
AK		 470
471 setattr_copy(dentry->d_inode, iattr);
472 mark_inode_dirty(dentry->d_inode);
473 if (iattr->ia_valid & ATTR_MODE) {
474 /* We also want to update ACL when we update mode bits */
475 retval = v9fs_acl_chmod(dentry);
476 if (retval < 0)
477 return retval;
478 }
479 return 0;
480}
481
482/**
483 * v9fs_stat2inode_dotl - populate an inode structure with stat info
484 * @stat: stat structure
485 * @inode: inode to populate
486 * @sb: superblock of filesystem
487 *
488 */
489
490void
491v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
492{
b3cbea03 493 struct v9fs_inode *v9inode = V9FS_I(inode);
53c06f4e
AK		 494
495 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
496 inode->i_atime.tv_sec = stat->st_atime_sec;
497 inode->i_atime.tv_nsec = stat->st_atime_nsec;
498 inode->i_mtime.tv_sec = stat->st_mtime_sec;
499 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
500 inode->i_ctime.tv_sec = stat->st_ctime_sec;
501 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
502 inode->i_uid = stat->st_uid;
503 inode->i_gid = stat->st_gid;
504 inode->i_nlink = stat->st_nlink;
505 inode->i_mode = stat->st_mode;
506 inode->i_rdev = new_decode_dev(stat->st_rdev);
507
508 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
509 init_special_inode(inode, inode->i_mode, inode->i_rdev);
510
511 i_size_write(inode, stat->st_size);
512 inode->i_blocks = stat->st_blocks;
513 } else {
514 if (stat->st_result_mask & P9_STATS_ATIME) {
515 inode->i_atime.tv_sec = stat->st_atime_sec;
516 inode->i_atime.tv_nsec = stat->st_atime_nsec;
517 }
518 if (stat->st_result_mask & P9_STATS_MTIME) {
519 inode->i_mtime.tv_sec = stat->st_mtime_sec;
520 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
521 }
522 if (stat->st_result_mask & P9_STATS_CTIME) {
523 inode->i_ctime.tv_sec = stat->st_ctime_sec;
524 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
525 }
526 if (stat->st_result_mask & P9_STATS_UID)
527 inode->i_uid = stat->st_uid;
528 if (stat->st_result_mask & P9_STATS_GID)
529 inode->i_gid = stat->st_gid;
530 if (stat->st_result_mask & P9_STATS_NLINK)
531 inode->i_nlink = stat->st_nlink;
532 if (stat->st_result_mask & P9_STATS_MODE) {
533 inode->i_mode = stat->st_mode;
534 if ((S_ISBLK(inode->i_mode)) ||
535 (S_ISCHR(inode->i_mode)))
536 init_special_inode(inode, inode->i_mode,
537 inode->i_rdev);
538 }
539 if (stat->st_result_mask & P9_STATS_RDEV)
540 inode->i_rdev = new_decode_dev(stat->st_rdev);
541 if (stat->st_result_mask & P9_STATS_SIZE)
542 i_size_write(inode, stat->st_size);
543 if (stat->st_result_mask & P9_STATS_BLOCKS)
544 inode->i_blocks = stat->st_blocks;
545 }
546 if (stat->st_result_mask & P9_STATS_GEN)
547 inode->i_generation = stat->st_gen;
548
549 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
550 * because the inode structure does not have fields for them.
551 */
b3cbea03 552 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
53c06f4e
AK		 553}
554
555static int
556v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
557 const char *symname)
558{
53c06f4e
AK		 559 int err;
560 gid_t gid;
d28c61f0
AK		 561 char *name;
562 struct p9_qid qid;
563 struct inode *inode;
564 struct p9_fid *dfid;
565 struct p9_fid *fid = NULL;
566 struct v9fs_session_info *v9ses;
53c06f4e
AK		 567
568 name = (char *) dentry->d_name.name;
569 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
570 dir->i_ino, name, symname);
571 v9ses = v9fs_inode2v9ses(dir);
572
573 dfid = v9fs_fid_lookup(dentry->d_parent);
574 if (IS_ERR(dfid)) {
575 err = PTR_ERR(dfid);
576 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
577 return err;
578 }
579
580 gid = v9fs_get_fsgid_for_create(dir);
581
582 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
583 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
584
585 if (err < 0) {
586 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
587 goto error;
588 }
589
d28c61f0 590 v9fs_invalidate_inode_attr(dir);
53c06f4e
AK		 591 if (v9ses->cache) {
592 /* Now walk from the parent so we can get an unopened fid. */
593 fid = p9_client_walk(dfid, 1, &name, 1);
594 if (IS_ERR(fid)) {
595 err = PTR_ERR(fid);
596 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
597 err);
598 fid = NULL;
599 goto error;
600 }
601
602 /* instantiate inode and assign the unopened fid to dentry */
a78ce05d 603 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
53c06f4e
AK		 604 if (IS_ERR(inode)) {
605 err = PTR_ERR(inode);
606 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
607 err);
608 goto error;
609 }
53c06f4e
AK		 610 d_instantiate(dentry, inode);
611 err = v9fs_fid_add(dentry, fid);
612 if (err < 0)
613 goto error;
614 fid = NULL;
615 } else {
616 /* Not in cached mode. No need to populate inode with stat */
617 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
618 if (IS_ERR(inode)) {
619 err = PTR_ERR(inode);
620 goto error;
621 }
53c06f4e
AK		 622 d_instantiate(dentry, inode);
623 }
624
625error:
626 if (fid)
627 p9_client_clunk(fid);
628
629 return err;
630}
631
632/**
633 * v9fs_vfs_link_dotl - create a hardlink for dotl
634 * @old_dentry: dentry for file to link to
635 * @dir: inode destination for new link
636 * @dentry: dentry for link
637 *
638 */
639
640static int
641v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
642 struct dentry *dentry)
643{
644 int err;
53c06f4e 645 char *name;
53c06f4e 646 struct dentry *dir_dentry;
d28c61f0
AK		 647 struct p9_fid *dfid, *oldfid;
648 struct v9fs_session_info *v9ses;
53c06f4e
AK		 649
650 P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
651 dir->i_ino, old_dentry->d_name.name,
652 dentry->d_name.name);
653
654 v9ses = v9fs_inode2v9ses(dir);
655 dir_dentry = v9fs_dentry_from_dir_inode(dir);
656 dfid = v9fs_fid_lookup(dir_dentry);
657 if (IS_ERR(dfid))
658 return PTR_ERR(dfid);
659
660 oldfid = v9fs_fid_lookup(old_dentry);
661 if (IS_ERR(oldfid))
662 return PTR_ERR(oldfid);
663
664 name = (char *) dentry->d_name.name;
665
666 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
667
668 if (err < 0) {
669 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
670 return err;
671 }
672
d28c61f0 673 v9fs_invalidate_inode_attr(dir);
53c06f4e
AK		 674 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
675 /* Get the latest stat info from server. */
676 struct p9_fid *fid;
53c06f4e
AK		 677 fid = v9fs_fid_lookup(old_dentry);
678 if (IS_ERR(fid))
679 return PTR_ERR(fid);
680
c06c066a 681 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
53c06f4e 682 }
20656a49 683 ihold(old_dentry->d_inode);
53c06f4e
AK		 684 d_instantiate(dentry, old_dentry->d_inode);
685
686 return err;
687}
688
689/**
690 * v9fs_vfs_mknod_dotl - create a special file
691 * @dir: inode destination for new link
692 * @dentry: dentry for file
693 * @mode: mode for creation
694 * @rdev: device associated with special file
695 *
696 */
697static int
698v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
699 dev_t rdev)
700{
701 int err;
d28c61f0 702 gid_t gid;
53c06f4e
AK		 703 char *name;
704 mode_t mode;
705 struct v9fs_session_info *v9ses;
706 struct p9_fid *fid = NULL, *dfid = NULL;
707 struct inode *inode;
53c06f4e
AK		 708 struct p9_qid qid;
709 struct dentry *dir_dentry;
710 struct posix_acl *dacl = NULL, *pacl = NULL;
711
712 P9_DPRINTK(P9_DEBUG_VFS,
713 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
714 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
715
716 if (!new_valid_dev(rdev))
717 return -EINVAL;
718
719 v9ses = v9fs_inode2v9ses(dir);
720 dir_dentry = v9fs_dentry_from_dir_inode(dir);
721 dfid = v9fs_fid_lookup(dir_dentry);
722 if (IS_ERR(dfid)) {
723 err = PTR_ERR(dfid);
724 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
725 dfid = NULL;
726 goto error;
727 }
728
729 gid = v9fs_get_fsgid_for_create(dir);
730 mode = omode;
731 /* Update mode based on ACL value */
732 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
733 if (err) {
734 P9_DPRINTK(P9_DEBUG_VFS,
735 "Failed to get acl values in mknod %d\n", err);
736 goto error;
737 }
738 name = (char *) dentry->d_name.name;
739
740 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
741 if (err < 0)
742 goto error;
743
d28c61f0 744 v9fs_invalidate_inode_attr(dir);
53c06f4e
AK		 745 /* instantiate inode and assign the unopened fid to the dentry */
746 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
747 fid = p9_client_walk(dfid, 1, &name, 1);
748 if (IS_ERR(fid)) {
749 err = PTR_ERR(fid);
750 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
751 err);
752 fid = NULL;
753 goto error;
754 }
755
a78ce05d 756 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
53c06f4e
AK		 757 if (IS_ERR(inode)) {
758 err = PTR_ERR(inode);
759 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
760 err);
761 goto error;
762 }
53c06f4e
AK		 763 d_instantiate(dentry, inode);
764 err = v9fs_fid_add(dentry, fid);
765 if (err < 0)
766 goto error;
767 fid = NULL;
768 } else {
769 /*
770 * Not in cached mode. No need to populate inode with stat.
771 * socket syscall returns a fd, so we need instantiate
772 */
773 inode = v9fs_get_inode(dir->i_sb, mode);
774 if (IS_ERR(inode)) {
775 err = PTR_ERR(inode);
776 goto error;
777 }
53c06f4e
AK		 778 d_instantiate(dentry, inode);
779 }
780 /* Now set the ACL based on the default value */
781 v9fs_set_create_acl(dentry, dacl, pacl);
782error:
783 if (fid)
784 p9_client_clunk(fid);
785 return err;
786}
787
53c06f4e
AK		 788/**
789 * v9fs_vfs_follow_link_dotl - follow a symlink path
790 * @dentry: dentry for symlink
791 * @nd: nameidata
792 *
793 */
794
795static void *
796v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
797{
31b6ceac
MK		 798 int retval;
799 struct p9_fid *fid;
53c06f4e 800 char *link = __getname();
31b6ceac 801 char *target;
53c06f4e 802
31b6ceac 803 P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
53c06f4e 804
31b6ceac 805 if (!link) {
53c06f4e 806 link = ERR_PTR(-ENOMEM);
31b6ceac 807 goto ndset;
53c06f4e 808 }
31b6ceac
MK		 809 fid = v9fs_fid_lookup(dentry);
810 if (IS_ERR(fid)) {
811 __putname(link);
812 link = ERR_PTR(PTR_ERR(fid));
813 goto ndset;
814 }
815 retval = p9_client_readlink(fid, &target);
816 if (!retval) {
817 strcpy(link, target);
818 kfree(target);
819 goto ndset;
820 }
821 __putname(link);
822 link = ERR_PTR(retval);
823ndset:
53c06f4e 824 nd_set_link(nd, link);
53c06f4e
AK		 825 return NULL;
826}
827
b3cbea03
AK		 828int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
829{
830 loff_t i_size;
831 struct p9_stat_dotl *st;
832 struct v9fs_session_info *v9ses;
833
834 v9ses = v9fs_inode2v9ses(inode);
835 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
836 if (IS_ERR(st))
837 return PTR_ERR(st);
838
839 spin_lock(&inode->i_lock);
840 /*
841 * We don't want to refresh inode->i_size,
842 * because we may have cached data
843 */
844 i_size = inode->i_size;
845 v9fs_stat2inode_dotl(st, inode);
846 if (v9ses->cache)
847 inode->i_size = i_size;
848 spin_unlock(&inode->i_lock);
849 kfree(st);
850 return 0;
851}
852
53c06f4e
AK		 853const struct inode_operations v9fs_dir_inode_operations_dotl = {
854 .create = v9fs_vfs_create_dotl,
855 .lookup = v9fs_vfs_lookup,
856 .link = v9fs_vfs_link_dotl,
857 .symlink = v9fs_vfs_symlink_dotl,
858 .unlink = v9fs_vfs_unlink,
859 .mkdir = v9fs_vfs_mkdir_dotl,
860 .rmdir = v9fs_vfs_rmdir,
861 .mknod = v9fs_vfs_mknod_dotl,
862 .rename = v9fs_vfs_rename,
863 .getattr = v9fs_vfs_getattr_dotl,
864 .setattr = v9fs_vfs_setattr_dotl,
865 .setxattr = generic_setxattr,
866 .getxattr = generic_getxattr,
867 .removexattr = generic_removexattr,
868 .listxattr = v9fs_listxattr,
869 .check_acl = v9fs_check_acl,
870};
871
872const struct inode_operations v9fs_file_inode_operations_dotl = {
873 .getattr = v9fs_vfs_getattr_dotl,
874 .setattr = v9fs_vfs_setattr_dotl,
875 .setxattr = generic_setxattr,
876 .getxattr = generic_getxattr,
877 .removexattr = generic_removexattr,
878 .listxattr = v9fs_listxattr,
879 .check_acl = v9fs_check_acl,
880};
881
882const struct inode_operations v9fs_symlink_inode_operations_dotl = {
31b6ceac 883 .readlink = generic_readlink,
53c06f4e
AK		 884 .follow_link = v9fs_vfs_follow_link_dotl,
885 .put_link = v9fs_vfs_put_link,
886 .getattr = v9fs_vfs_getattr_dotl,
887 .setattr = v9fs_vfs_setattr_dotl,
888 .setxattr = generic_setxattr,
889 .getxattr = generic_getxattr,
890 .removexattr = generic_removexattr,
891 .listxattr = v9fs_listxattr,
892};
Linux kernel - Deliverables
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