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