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fs/9p: Add v9fs_dentry2v9ses
[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);
5a7e0a8c 248 mutex_lock(&v9inode->v_mutex);
7add697a
AK		 249 if (v9ses->cache && !v9inode->writeback_fid &&
250 ((flags & O_ACCMODE) != O_RDONLY)) {
3cf387d7 251 /*
6b39f6d2 252 * clone a fid and add it to writeback_fid
3cf387d7
AK		 253 * we do it during open time instead of
254 * page dirty time via write_begin/page_mkwrite
255 * because we want write after unlink usecase
256 * to work.
257 */
258 inode_fid = v9fs_writeback_fid(dentry);
259 if (IS_ERR(inode_fid)) {
260 err = PTR_ERR(inode_fid);
5a7e0a8c 261 mutex_unlock(&v9inode->v_mutex);
3cf387d7
AK		 262 goto error;
263 }
6b39f6d2 264 v9inode->writeback_fid = (void *) inode_fid;
3cf387d7 265 }
5a7e0a8c 266 mutex_unlock(&v9inode->v_mutex);
af7542fc
AK		 267 /* Since we are opening a file, assign the open fid to the file */
268 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
269 if (IS_ERR(filp)) {
53c06f4e 270 p9_client_clunk(ofid);
af7542fc
AK		 271 return PTR_ERR(filp);
272 }
273 filp->private_data = ofid;
46848de0
AK		 274#ifdef CONFIG_9P_FSCACHE
275 if (v9ses->cache)
276 v9fs_cache_inode_set_cookie(inode, filp);
277#endif
53c06f4e
AK		 278 return 0;
279
280error:
281 if (ofid)
282 p9_client_clunk(ofid);
283 if (fid)
284 p9_client_clunk(fid);
285 return err;
286}
287
288/**
289 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
290 * @dir: inode that is being unlinked
291 * @dentry: dentry that is being unlinked
292 * @mode: mode for new directory
293 *
294 */
295
296static int v9fs_vfs_mkdir_dotl(struct inode *dir,
297 struct dentry *dentry, int omode)
298{
299 int err;
300 struct v9fs_session_info *v9ses;
301 struct p9_fid *fid = NULL, *dfid = NULL;
302 gid_t gid;
303 char *name;
304 mode_t mode;
305 struct inode *inode;
306 struct p9_qid qid;
307 struct dentry *dir_dentry;
308 struct posix_acl *dacl = NULL, *pacl = NULL;
309
310 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
311 err = 0;
312 v9ses = v9fs_inode2v9ses(dir);
313
314 omode |= S_IFDIR;
315 if (dir->i_mode & S_ISGID)
316 omode |= S_ISGID;
317
318 dir_dentry = v9fs_dentry_from_dir_inode(dir);
319 dfid = v9fs_fid_lookup(dir_dentry);
320 if (IS_ERR(dfid)) {
321 err = PTR_ERR(dfid);
322 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
323 dfid = NULL;
324 goto error;
325 }
326
327 gid = v9fs_get_fsgid_for_create(dir);
328 mode = omode;
329 /* Update mode based on ACL value */
330 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
331 if (err) {
332 P9_DPRINTK(P9_DEBUG_VFS,
333 "Failed to get acl values in mkdir %d\n", err);
334 goto error;
335 }
336 name = (char *) dentry->d_name.name;
337 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
338 if (err < 0)
339 goto error;
340
341 /* instantiate inode and assign the unopened fid to the dentry */
342 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
343 fid = p9_client_walk(dfid, 1, &name, 1);
344 if (IS_ERR(fid)) {
345 err = PTR_ERR(fid);
346 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
347 err);
348 fid = NULL;
349 goto error;
350 }
351
a78ce05d 352 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
53c06f4e
AK		 353 if (IS_ERR(inode)) {
354 err = PTR_ERR(inode);
355 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
356 err);
357 goto error;
358 }
53c06f4e
AK		 359 d_instantiate(dentry, inode);
360 err = v9fs_fid_add(dentry, fid);
361 if (err < 0)
362 goto error;
363 fid = NULL;
364 } else {
365 /*
366 * Not in cached mode. No need to populate
367 * inode with stat. We need to get an inode
368 * so that we can set the acl with dentry
369 */
370 inode = v9fs_get_inode(dir->i_sb, mode);
371 if (IS_ERR(inode)) {
372 err = PTR_ERR(inode);
373 goto error;
374 }
53c06f4e
AK		 375 d_instantiate(dentry, inode);
376 }
377 /* Now set the ACL based on the default value */
378 v9fs_set_create_acl(dentry, dacl, pacl);
b271ec47 379 inc_nlink(dir);
d28c61f0 380 v9fs_invalidate_inode_attr(dir);
53c06f4e
AK		 381error:
382 if (fid)
383 p9_client_clunk(fid);
384 return err;
385}
386
387static int
388v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
389 struct kstat *stat)
390{
391 int err;
392 struct v9fs_session_info *v9ses;
393 struct p9_fid *fid;
394 struct p9_stat_dotl *st;
395
396 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
397 err = -EPERM;
42869c8a 398 v9ses = v9fs_dentry2v9ses(dentry);
a1211908
AK		 399 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
400 generic_fillattr(dentry->d_inode, stat);
401 return 0;
402 }
53c06f4e
AK		 403 fid = v9fs_fid_lookup(dentry);
404 if (IS_ERR(fid))
405 return PTR_ERR(fid);
406
407 /* Ask for all the fields in stat structure. Server will return
408 * whatever it supports
409 */
410
411 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
412 if (IS_ERR(st))
413 return PTR_ERR(st);
414
415 v9fs_stat2inode_dotl(st, dentry->d_inode);
416 generic_fillattr(dentry->d_inode, stat);
417 /* Change block size to what the server returned */
418 stat->blksize = st->st_blksize;
419
420 kfree(st);
421 return 0;
422}
423
424/**
425 * v9fs_vfs_setattr_dotl - set file metadata
426 * @dentry: file whose metadata to set
427 * @iattr: metadata assignment structure
428 *
429 */
430
431int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
432{
433 int retval;
434 struct v9fs_session_info *v9ses;
435 struct p9_fid *fid;
436 struct p9_iattr_dotl p9attr;
437
438 P9_DPRINTK(P9_DEBUG_VFS, "\n");
439
440 retval = inode_change_ok(dentry->d_inode, iattr);
441 if (retval)
442 return retval;
443
444 p9attr.valid = iattr->ia_valid;
445 p9attr.mode = iattr->ia_mode;
446 p9attr.uid = iattr->ia_uid;
447 p9attr.gid = iattr->ia_gid;
448 p9attr.size = iattr->ia_size;
449 p9attr.atime_sec = iattr->ia_atime.tv_sec;
450 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
451 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
452 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
453
454 retval = -EPERM;
42869c8a 455 v9ses = v9fs_dentry2v9ses(dentry);
53c06f4e
AK		 456 fid = v9fs_fid_lookup(dentry);
457 if (IS_ERR(fid))
458 return PTR_ERR(fid);
459
3dc5436a
AK		 460 /* Write all dirty data */
461 if (S_ISREG(dentry->d_inode->i_mode))
462 filemap_write_and_wait(dentry->d_inode->i_mapping);
463
f10fc50f
AK		 464 retval = p9_client_setattr(fid, &p9attr);
465 if (retval < 0)
466 return retval;
53c06f4e 467
059c138b
AK		 468 if ((iattr->ia_valid & ATTR_SIZE) &&
469 iattr->ia_size != i_size_read(dentry->d_inode))
470 truncate_setsize(dentry->d_inode, iattr->ia_size);
471
472 v9fs_invalidate_inode_attr(dentry->d_inode);
53c06f4e
AK		 473 setattr_copy(dentry->d_inode, iattr);
474 mark_inode_dirty(dentry->d_inode);
475 if (iattr->ia_valid & ATTR_MODE) {
476 /* We also want to update ACL when we update mode bits */
477 retval = v9fs_acl_chmod(dentry);
478 if (retval < 0)
479 return retval;
480 }
481 return 0;
482}
483
484/**
485 * v9fs_stat2inode_dotl - populate an inode structure with stat info
486 * @stat: stat structure
487 * @inode: inode to populate
488 * @sb: superblock of filesystem
489 *
490 */
491
492void
493v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
494{
b3cbea03 495 struct v9fs_inode *v9inode = V9FS_I(inode);
53c06f4e
AK		 496
497 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
498 inode->i_atime.tv_sec = stat->st_atime_sec;
499 inode->i_atime.tv_nsec = stat->st_atime_nsec;
500 inode->i_mtime.tv_sec = stat->st_mtime_sec;
501 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
502 inode->i_ctime.tv_sec = stat->st_ctime_sec;
503 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
504 inode->i_uid = stat->st_uid;
505 inode->i_gid = stat->st_gid;
506 inode->i_nlink = stat->st_nlink;
507 inode->i_mode = stat->st_mode;
508 inode->i_rdev = new_decode_dev(stat->st_rdev);
509
510 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
511 init_special_inode(inode, inode->i_mode, inode->i_rdev);
512
513 i_size_write(inode, stat->st_size);
514 inode->i_blocks = stat->st_blocks;
515 } else {
516 if (stat->st_result_mask & P9_STATS_ATIME) {
517 inode->i_atime.tv_sec = stat->st_atime_sec;
518 inode->i_atime.tv_nsec = stat->st_atime_nsec;
519 }
520 if (stat->st_result_mask & P9_STATS_MTIME) {
521 inode->i_mtime.tv_sec = stat->st_mtime_sec;
522 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
523 }
524 if (stat->st_result_mask & P9_STATS_CTIME) {
525 inode->i_ctime.tv_sec = stat->st_ctime_sec;
526 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
527 }
528 if (stat->st_result_mask & P9_STATS_UID)
529 inode->i_uid = stat->st_uid;
530 if (stat->st_result_mask & P9_STATS_GID)
531 inode->i_gid = stat->st_gid;
532 if (stat->st_result_mask & P9_STATS_NLINK)
533 inode->i_nlink = stat->st_nlink;
534 if (stat->st_result_mask & P9_STATS_MODE) {
535 inode->i_mode = stat->st_mode;
536 if ((S_ISBLK(inode->i_mode)) ||
537 (S_ISCHR(inode->i_mode)))
538 init_special_inode(inode, inode->i_mode,
539 inode->i_rdev);
540 }
541 if (stat->st_result_mask & P9_STATS_RDEV)
542 inode->i_rdev = new_decode_dev(stat->st_rdev);
543 if (stat->st_result_mask & P9_STATS_SIZE)
544 i_size_write(inode, stat->st_size);
545 if (stat->st_result_mask & P9_STATS_BLOCKS)
546 inode->i_blocks = stat->st_blocks;
547 }
548 if (stat->st_result_mask & P9_STATS_GEN)
549 inode->i_generation = stat->st_gen;
550
551 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
552 * because the inode structure does not have fields for them.
553 */
b3cbea03 554 v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
53c06f4e
AK		 555}
556
557static int
558v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
559 const char *symname)
560{
53c06f4e
AK		 561 int err;
562 gid_t gid;
d28c61f0
AK		 563 char *name;
564 struct p9_qid qid;
565 struct inode *inode;
566 struct p9_fid *dfid;
567 struct p9_fid *fid = NULL;
568 struct v9fs_session_info *v9ses;
53c06f4e
AK		 569
570 name = (char *) dentry->d_name.name;
571 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
572 dir->i_ino, name, symname);
573 v9ses = v9fs_inode2v9ses(dir);
574
575 dfid = v9fs_fid_lookup(dentry->d_parent);
576 if (IS_ERR(dfid)) {
577 err = PTR_ERR(dfid);
578 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
579 return err;
580 }
581
582 gid = v9fs_get_fsgid_for_create(dir);
583
584 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
585 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
586
587 if (err < 0) {
588 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
589 goto error;
590 }
591
d28c61f0 592 v9fs_invalidate_inode_attr(dir);
53c06f4e
AK		 593 if (v9ses->cache) {
594 /* Now walk from the parent so we can get an unopened fid. */
595 fid = p9_client_walk(dfid, 1, &name, 1);
596 if (IS_ERR(fid)) {
597 err = PTR_ERR(fid);
598 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
599 err);
600 fid = NULL;
601 goto error;
602 }
603
604 /* instantiate inode and assign the unopened fid to dentry */
a78ce05d 605 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
53c06f4e
AK		 606 if (IS_ERR(inode)) {
607 err = PTR_ERR(inode);
608 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
609 err);
610 goto error;
611 }
53c06f4e
AK		 612 d_instantiate(dentry, inode);
613 err = v9fs_fid_add(dentry, fid);
614 if (err < 0)
615 goto error;
616 fid = NULL;
617 } else {
618 /* Not in cached mode. No need to populate inode with stat */
619 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
620 if (IS_ERR(inode)) {
621 err = PTR_ERR(inode);
622 goto error;
623 }
53c06f4e
AK		 624 d_instantiate(dentry, inode);
625 }
626
627error:
628 if (fid)
629 p9_client_clunk(fid);
630
631 return err;
632}
633
634/**
635 * v9fs_vfs_link_dotl - create a hardlink for dotl
636 * @old_dentry: dentry for file to link to
637 * @dir: inode destination for new link
638 * @dentry: dentry for link
639 *
640 */
641
642static int
643v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
644 struct dentry *dentry)
645{
646 int err;
53c06f4e 647 char *name;
53c06f4e 648 struct dentry *dir_dentry;
d28c61f0
AK		 649 struct p9_fid *dfid, *oldfid;
650 struct v9fs_session_info *v9ses;
53c06f4e
AK		 651
652 P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
653 dir->i_ino, old_dentry->d_name.name,
654 dentry->d_name.name);
655
656 v9ses = v9fs_inode2v9ses(dir);
657 dir_dentry = v9fs_dentry_from_dir_inode(dir);
658 dfid = v9fs_fid_lookup(dir_dentry);
659 if (IS_ERR(dfid))
660 return PTR_ERR(dfid);
661
662 oldfid = v9fs_fid_lookup(old_dentry);
663 if (IS_ERR(oldfid))
664 return PTR_ERR(oldfid);
665
666 name = (char *) dentry->d_name.name;
667
668 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
669
670 if (err < 0) {
671 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
672 return err;
673 }
674
d28c61f0 675 v9fs_invalidate_inode_attr(dir);
53c06f4e
AK		 676 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
677 /* Get the latest stat info from server. */
678 struct p9_fid *fid;
53c06f4e
AK		 679 fid = v9fs_fid_lookup(old_dentry);
680 if (IS_ERR(fid))
681 return PTR_ERR(fid);
682
c06c066a 683 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
53c06f4e 684 }
20656a49 685 ihold(old_dentry->d_inode);
53c06f4e
AK		 686 d_instantiate(dentry, old_dentry->d_inode);
687
688 return err;
689}
690
691/**
692 * v9fs_vfs_mknod_dotl - create a special file
693 * @dir: inode destination for new link
694 * @dentry: dentry for file
695 * @mode: mode for creation
696 * @rdev: device associated with special file
697 *
698 */
699static int
700v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
701 dev_t rdev)
702{
703 int err;
d28c61f0 704 gid_t gid;
53c06f4e
AK		 705 char *name;
706 mode_t mode;
707 struct v9fs_session_info *v9ses;
708 struct p9_fid *fid = NULL, *dfid = NULL;
709 struct inode *inode;
53c06f4e
AK		 710 struct p9_qid qid;
711 struct dentry *dir_dentry;
712 struct posix_acl *dacl = NULL, *pacl = NULL;
713
714 P9_DPRINTK(P9_DEBUG_VFS,
715 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
716 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
717
718 if (!new_valid_dev(rdev))
719 return -EINVAL;
720
721 v9ses = v9fs_inode2v9ses(dir);
722 dir_dentry = v9fs_dentry_from_dir_inode(dir);
723 dfid = v9fs_fid_lookup(dir_dentry);
724 if (IS_ERR(dfid)) {
725 err = PTR_ERR(dfid);
726 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
727 dfid = NULL;
728 goto error;
729 }
730
731 gid = v9fs_get_fsgid_for_create(dir);
732 mode = omode;
733 /* Update mode based on ACL value */
734 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
735 if (err) {
736 P9_DPRINTK(P9_DEBUG_VFS,
737 "Failed to get acl values in mknod %d\n", err);
738 goto error;
739 }
740 name = (char *) dentry->d_name.name;
741
742 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
743 if (err < 0)
744 goto error;
745
d28c61f0 746 v9fs_invalidate_inode_attr(dir);
53c06f4e
AK		 747 /* instantiate inode and assign the unopened fid to the dentry */
748 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
749 fid = p9_client_walk(dfid, 1, &name, 1);
750 if (IS_ERR(fid)) {
751 err = PTR_ERR(fid);
752 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
753 err);
754 fid = NULL;
755 goto error;
756 }
757
a78ce05d 758 inode = v9fs_get_inode_from_fid(v9ses, fid, dir->i_sb);
53c06f4e
AK		 759 if (IS_ERR(inode)) {
760 err = PTR_ERR(inode);
761 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
762 err);
763 goto error;
764 }
53c06f4e
AK		 765 d_instantiate(dentry, inode);
766 err = v9fs_fid_add(dentry, fid);
767 if (err < 0)
768 goto error;
769 fid = NULL;
770 } else {
771 /*
772 * Not in cached mode. No need to populate inode with stat.
773 * socket syscall returns a fd, so we need instantiate
774 */
775 inode = v9fs_get_inode(dir->i_sb, mode);
776 if (IS_ERR(inode)) {
777 err = PTR_ERR(inode);
778 goto error;
779 }
53c06f4e
AK		 780 d_instantiate(dentry, inode);
781 }
782 /* Now set the ACL based on the default value */
783 v9fs_set_create_acl(dentry, dacl, pacl);
784error:
785 if (fid)
786 p9_client_clunk(fid);
787 return err;
788}
789
53c06f4e
AK		 790/**
791 * v9fs_vfs_follow_link_dotl - follow a symlink path
792 * @dentry: dentry for symlink
793 * @nd: nameidata
794 *
795 */
796
797static void *
798v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
799{
31b6ceac
MK		 800 int retval;
801 struct p9_fid *fid;
53c06f4e 802 char *link = __getname();
31b6ceac 803 char *target;
53c06f4e 804
31b6ceac 805 P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
53c06f4e 806
31b6ceac 807 if (!link) {
53c06f4e 808 link = ERR_PTR(-ENOMEM);
31b6ceac 809 goto ndset;
53c06f4e 810 }
31b6ceac
MK		 811 fid = v9fs_fid_lookup(dentry);
812 if (IS_ERR(fid)) {
813 __putname(link);
814 link = ERR_PTR(PTR_ERR(fid));
815 goto ndset;
816 }
817 retval = p9_client_readlink(fid, &target);
818 if (!retval) {
819 strcpy(link, target);
820 kfree(target);
821 goto ndset;
822 }
823 __putname(link);
824 link = ERR_PTR(retval);
825ndset:
53c06f4e 826 nd_set_link(nd, link);
53c06f4e
AK		 827 return NULL;
828}
829
b3cbea03
AK		 830int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
831{
832 loff_t i_size;
833 struct p9_stat_dotl *st;
834 struct v9fs_session_info *v9ses;
835
836 v9ses = v9fs_inode2v9ses(inode);
837 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
838 if (IS_ERR(st))
839 return PTR_ERR(st);
840
841 spin_lock(&inode->i_lock);
842 /*
843 * We don't want to refresh inode->i_size,
844 * because we may have cached data
845 */
846 i_size = inode->i_size;
847 v9fs_stat2inode_dotl(st, inode);
848 if (v9ses->cache)
849 inode->i_size = i_size;
850 spin_unlock(&inode->i_lock);
851 kfree(st);
852 return 0;
853}
854
53c06f4e
AK		 855const struct inode_operations v9fs_dir_inode_operations_dotl = {
856 .create = v9fs_vfs_create_dotl,
857 .lookup = v9fs_vfs_lookup,
858 .link = v9fs_vfs_link_dotl,
859 .symlink = v9fs_vfs_symlink_dotl,
860 .unlink = v9fs_vfs_unlink,
861 .mkdir = v9fs_vfs_mkdir_dotl,
862 .rmdir = v9fs_vfs_rmdir,
863 .mknod = v9fs_vfs_mknod_dotl,
864 .rename = v9fs_vfs_rename,
865 .getattr = v9fs_vfs_getattr_dotl,
866 .setattr = v9fs_vfs_setattr_dotl,
867 .setxattr = generic_setxattr,
868 .getxattr = generic_getxattr,
869 .removexattr = generic_removexattr,
870 .listxattr = v9fs_listxattr,
871 .check_acl = v9fs_check_acl,
872};
873
874const struct inode_operations v9fs_file_inode_operations_dotl = {
875 .getattr = v9fs_vfs_getattr_dotl,
876 .setattr = v9fs_vfs_setattr_dotl,
877 .setxattr = generic_setxattr,
878 .getxattr = generic_getxattr,
879 .removexattr = generic_removexattr,
880 .listxattr = v9fs_listxattr,
881 .check_acl = v9fs_check_acl,
882};
883
884const struct inode_operations v9fs_symlink_inode_operations_dotl = {
31b6ceac 885 .readlink = generic_readlink,
53c06f4e
AK		 886 .follow_link = v9fs_vfs_follow_link_dotl,
887 .put_link = v9fs_vfs_put_link,
888 .getattr = v9fs_vfs_getattr_dotl,
889 .setattr = v9fs_vfs_setattr_dotl,
890 .setxattr = generic_setxattr,
891 .getxattr = generic_getxattr,
892 .removexattr = generic_removexattr,
893 .listxattr = v9fs_listxattr,
894};
Linux kernel - Deliverables
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