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fs/9p: Move dotl inode operations into a seperate file
[linux.git] / fs / 9p / vfs_inode_dotl.c
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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 <[email protected]>
7 * Copyright (C) 2002 by Ron Minnich <[email protected]>
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
89struct inode *
90v9fs_inode_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
91 struct super_block *sb)
92{
93 struct inode *ret = NULL;
94 int err;
95 struct p9_stat_dotl *st;
96
97 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
98 if (IS_ERR(st))
99 return ERR_CAST(st);
100
101 ret = v9fs_get_inode(sb, st->st_mode);
102 if (IS_ERR(ret)) {
103 err = PTR_ERR(ret);
104 goto error;
105 }
106
107 v9fs_stat2inode_dotl(st, ret);
108 ret->i_ino = v9fs_qid2ino(&st->qid);
109#ifdef CONFIG_9P_FSCACHE
110 v9fs_vcookie_set_qid(ret, &st->qid);
111 v9fs_cache_inode_get_cookie(ret);
112#endif
113 err = v9fs_get_acl(ret, fid);
114 if (err) {
115 iput(ret);
116 goto error;
117 }
118 kfree(st);
119 return ret;
120error:
121 kfree(st);
122 return ERR_PTR(err);
123}
124
125/**
126 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
127 * @dir: directory inode that is being created
128 * @dentry: dentry that is being deleted
129 * @mode: create permissions
130 * @nd: path information
131 *
132 */
133
134static int
135v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
136 struct nameidata *nd)
137{
138 int err = 0;
139 char *name = NULL;
140 gid_t gid;
141 int flags;
142 mode_t mode;
143 struct v9fs_session_info *v9ses;
144 struct p9_fid *fid = NULL;
145 struct p9_fid *dfid, *ofid;
146 struct file *filp;
147 struct p9_qid qid;
148 struct inode *inode;
149 struct posix_acl *pacl = NULL, *dacl = NULL;
150
151 v9ses = v9fs_inode2v9ses(dir);
152 if (nd && nd->flags & LOOKUP_OPEN)
153 flags = nd->intent.open.flags - 1;
154 else {
155 /*
156 * create call without LOOKUP_OPEN is due
157 * to mknod of regular files. So use mknod
158 * operation.
159 */
160 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
161 }
162
163 name = (char *) dentry->d_name.name;
164 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
165 "mode:0x%x\n", name, flags, omode);
166
167 dfid = v9fs_fid_lookup(dentry->d_parent);
168 if (IS_ERR(dfid)) {
169 err = PTR_ERR(dfid);
170 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
171 return err;
172 }
173
174 /* clone a fid to use for creation */
175 ofid = p9_client_walk(dfid, 0, NULL, 1);
176 if (IS_ERR(ofid)) {
177 err = PTR_ERR(ofid);
178 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
179 return err;
180 }
181
182 gid = v9fs_get_fsgid_for_create(dir);
183
184 mode = omode;
185 /* Update mode based on ACL value */
186 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
187 if (err) {
188 P9_DPRINTK(P9_DEBUG_VFS,
189 "Failed to get acl values in creat %d\n", err);
190 goto error;
191 }
192 err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
193 if (err < 0) {
194 P9_DPRINTK(P9_DEBUG_VFS,
195 "p9_client_open_dotl failed in creat %d\n",
196 err);
197 goto error;
198 }
199 /* instantiate inode and assign the unopened fid to the dentry */
200 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE ||
201 (nd && nd->flags & LOOKUP_OPEN)) {
202 fid = p9_client_walk(dfid, 1, &name, 1);
203 if (IS_ERR(fid)) {
204 err = PTR_ERR(fid);
205 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
206 err);
207 fid = NULL;
208 goto error;
209 }
210
211 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
212 if (IS_ERR(inode)) {
213 err = PTR_ERR(inode);
214 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
215 err);
216 goto error;
217 }
218 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
219 d_instantiate(dentry, inode);
220 err = v9fs_fid_add(dentry, fid);
221 if (err < 0)
222 goto error;
223 /* The fid would get clunked via a dput */
224 fid = NULL;
225 } else {
226 /*
227 * Not in cached mode. No need to populate
228 * inode with stat. We need to get an inode
229 * so that we can set the acl with dentry
230 */
231 inode = v9fs_get_inode(dir->i_sb, mode);
232 if (IS_ERR(inode)) {
233 err = PTR_ERR(inode);
234 goto error;
235 }
236 d_set_d_op(dentry, &v9fs_dentry_operations);
237 d_instantiate(dentry, inode);
238 }
239 /* Now set the ACL based on the default value */
240 v9fs_set_create_acl(dentry, dacl, pacl);
241
242 /* if we are opening a file, assign the open fid to the file */
243 if (nd && nd->flags & LOOKUP_OPEN) {
244 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
245 if (IS_ERR(filp)) {
246 p9_client_clunk(ofid);
247 return PTR_ERR(filp);
248 }
249 filp->private_data = ofid;
250 } else
251 p9_client_clunk(ofid);
252
253 return 0;
254
255error:
256 if (ofid)
257 p9_client_clunk(ofid);
258 if (fid)
259 p9_client_clunk(fid);
260 return err;
261}
262
263/**
264 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
265 * @dir: inode that is being unlinked
266 * @dentry: dentry that is being unlinked
267 * @mode: mode for new directory
268 *
269 */
270
271static int v9fs_vfs_mkdir_dotl(struct inode *dir,
272 struct dentry *dentry, int omode)
273{
274 int err;
275 struct v9fs_session_info *v9ses;
276 struct p9_fid *fid = NULL, *dfid = NULL;
277 gid_t gid;
278 char *name;
279 mode_t mode;
280 struct inode *inode;
281 struct p9_qid qid;
282 struct dentry *dir_dentry;
283 struct posix_acl *dacl = NULL, *pacl = NULL;
284
285 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
286 err = 0;
287 v9ses = v9fs_inode2v9ses(dir);
288
289 omode |= S_IFDIR;
290 if (dir->i_mode & S_ISGID)
291 omode |= S_ISGID;
292
293 dir_dentry = v9fs_dentry_from_dir_inode(dir);
294 dfid = v9fs_fid_lookup(dir_dentry);
295 if (IS_ERR(dfid)) {
296 err = PTR_ERR(dfid);
297 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
298 dfid = NULL;
299 goto error;
300 }
301
302 gid = v9fs_get_fsgid_for_create(dir);
303 mode = omode;
304 /* Update mode based on ACL value */
305 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
306 if (err) {
307 P9_DPRINTK(P9_DEBUG_VFS,
308 "Failed to get acl values in mkdir %d\n", err);
309 goto error;
310 }
311 name = (char *) dentry->d_name.name;
312 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
313 if (err < 0)
314 goto error;
315
316 /* instantiate inode and assign the unopened fid to the dentry */
317 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
318 fid = p9_client_walk(dfid, 1, &name, 1);
319 if (IS_ERR(fid)) {
320 err = PTR_ERR(fid);
321 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
322 err);
323 fid = NULL;
324 goto error;
325 }
326
327 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
328 if (IS_ERR(inode)) {
329 err = PTR_ERR(inode);
330 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
331 err);
332 goto error;
333 }
334 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
335 d_instantiate(dentry, inode);
336 err = v9fs_fid_add(dentry, fid);
337 if (err < 0)
338 goto error;
339 fid = NULL;
340 } else {
341 /*
342 * Not in cached mode. No need to populate
343 * inode with stat. We need to get an inode
344 * so that we can set the acl with dentry
345 */
346 inode = v9fs_get_inode(dir->i_sb, mode);
347 if (IS_ERR(inode)) {
348 err = PTR_ERR(inode);
349 goto error;
350 }
351 d_set_d_op(dentry, &v9fs_dentry_operations);
352 d_instantiate(dentry, inode);
353 }
354 /* Now set the ACL based on the default value */
355 v9fs_set_create_acl(dentry, dacl, pacl);
356
357error:
358 if (fid)
359 p9_client_clunk(fid);
360 return err;
361}
362
363static int
364v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
365 struct kstat *stat)
366{
367 int err;
368 struct v9fs_session_info *v9ses;
369 struct p9_fid *fid;
370 struct p9_stat_dotl *st;
371
372 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
373 err = -EPERM;
374 v9ses = v9fs_inode2v9ses(dentry->d_inode);
375 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
376 return simple_getattr(mnt, dentry, stat);
377
378 fid = v9fs_fid_lookup(dentry);
379 if (IS_ERR(fid))
380 return PTR_ERR(fid);
381
382 /* Ask for all the fields in stat structure. Server will return
383 * whatever it supports
384 */
385
386 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
387 if (IS_ERR(st))
388 return PTR_ERR(st);
389
390 v9fs_stat2inode_dotl(st, dentry->d_inode);
391 generic_fillattr(dentry->d_inode, stat);
392 /* Change block size to what the server returned */
393 stat->blksize = st->st_blksize;
394
395 kfree(st);
396 return 0;
397}
398
399/**
400 * v9fs_vfs_setattr_dotl - set file metadata
401 * @dentry: file whose metadata to set
402 * @iattr: metadata assignment structure
403 *
404 */
405
406int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
407{
408 int retval;
409 struct v9fs_session_info *v9ses;
410 struct p9_fid *fid;
411 struct p9_iattr_dotl p9attr;
412
413 P9_DPRINTK(P9_DEBUG_VFS, "\n");
414
415 retval = inode_change_ok(dentry->d_inode, iattr);
416 if (retval)
417 return retval;
418
419 p9attr.valid = iattr->ia_valid;
420 p9attr.mode = iattr->ia_mode;
421 p9attr.uid = iattr->ia_uid;
422 p9attr.gid = iattr->ia_gid;
423 p9attr.size = iattr->ia_size;
424 p9attr.atime_sec = iattr->ia_atime.tv_sec;
425 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
426 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
427 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
428
429 retval = -EPERM;
430 v9ses = v9fs_inode2v9ses(dentry->d_inode);
431 fid = v9fs_fid_lookup(dentry);
432 if (IS_ERR(fid))
433 return PTR_ERR(fid);
434
435 retval = p9_client_setattr(fid, &p9attr);
436 if (retval < 0)
437 return retval;
438
439 if ((iattr->ia_valid & ATTR_SIZE) &&
440 iattr->ia_size != i_size_read(dentry->d_inode)) {
441 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
442 if (retval)
443 return retval;
444 }
445
446 setattr_copy(dentry->d_inode, iattr);
447 mark_inode_dirty(dentry->d_inode);
448 if (iattr->ia_valid & ATTR_MODE) {
449 /* We also want to update ACL when we update mode bits */
450 retval = v9fs_acl_chmod(dentry);
451 if (retval < 0)
452 return retval;
453 }
454 return 0;
455}
456
457/**
458 * v9fs_stat2inode_dotl - populate an inode structure with stat info
459 * @stat: stat structure
460 * @inode: inode to populate
461 * @sb: superblock of filesystem
462 *
463 */
464
465void
466v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
467{
468
469 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
470 inode->i_atime.tv_sec = stat->st_atime_sec;
471 inode->i_atime.tv_nsec = stat->st_atime_nsec;
472 inode->i_mtime.tv_sec = stat->st_mtime_sec;
473 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
474 inode->i_ctime.tv_sec = stat->st_ctime_sec;
475 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
476 inode->i_uid = stat->st_uid;
477 inode->i_gid = stat->st_gid;
478 inode->i_nlink = stat->st_nlink;
479 inode->i_mode = stat->st_mode;
480 inode->i_rdev = new_decode_dev(stat->st_rdev);
481
482 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
483 init_special_inode(inode, inode->i_mode, inode->i_rdev);
484
485 i_size_write(inode, stat->st_size);
486 inode->i_blocks = stat->st_blocks;
487 } else {
488 if (stat->st_result_mask & P9_STATS_ATIME) {
489 inode->i_atime.tv_sec = stat->st_atime_sec;
490 inode->i_atime.tv_nsec = stat->st_atime_nsec;
491 }
492 if (stat->st_result_mask & P9_STATS_MTIME) {
493 inode->i_mtime.tv_sec = stat->st_mtime_sec;
494 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
495 }
496 if (stat->st_result_mask & P9_STATS_CTIME) {
497 inode->i_ctime.tv_sec = stat->st_ctime_sec;
498 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
499 }
500 if (stat->st_result_mask & P9_STATS_UID)
501 inode->i_uid = stat->st_uid;
502 if (stat->st_result_mask & P9_STATS_GID)
503 inode->i_gid = stat->st_gid;
504 if (stat->st_result_mask & P9_STATS_NLINK)
505 inode->i_nlink = stat->st_nlink;
506 if (stat->st_result_mask & P9_STATS_MODE) {
507 inode->i_mode = stat->st_mode;
508 if ((S_ISBLK(inode->i_mode)) ||
509 (S_ISCHR(inode->i_mode)))
510 init_special_inode(inode, inode->i_mode,
511 inode->i_rdev);
512 }
513 if (stat->st_result_mask & P9_STATS_RDEV)
514 inode->i_rdev = new_decode_dev(stat->st_rdev);
515 if (stat->st_result_mask & P9_STATS_SIZE)
516 i_size_write(inode, stat->st_size);
517 if (stat->st_result_mask & P9_STATS_BLOCKS)
518 inode->i_blocks = stat->st_blocks;
519 }
520 if (stat->st_result_mask & P9_STATS_GEN)
521 inode->i_generation = stat->st_gen;
522
523 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
524 * because the inode structure does not have fields for them.
525 */
526}
527
528static int
529v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
530 const char *symname)
531{
532 struct v9fs_session_info *v9ses;
533 struct p9_fid *dfid;
534 struct p9_fid *fid = NULL;
535 struct inode *inode;
536 struct p9_qid qid;
537 char *name;
538 int err;
539 gid_t gid;
540
541 name = (char *) dentry->d_name.name;
542 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
543 dir->i_ino, name, symname);
544 v9ses = v9fs_inode2v9ses(dir);
545
546 dfid = v9fs_fid_lookup(dentry->d_parent);
547 if (IS_ERR(dfid)) {
548 err = PTR_ERR(dfid);
549 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
550 return err;
551 }
552
553 gid = v9fs_get_fsgid_for_create(dir);
554
555 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
556 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
557
558 if (err < 0) {
559 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
560 goto error;
561 }
562
563 if (v9ses->cache) {
564 /* Now walk from the parent so we can get an unopened fid. */
565 fid = p9_client_walk(dfid, 1, &name, 1);
566 if (IS_ERR(fid)) {
567 err = PTR_ERR(fid);
568 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
569 err);
570 fid = NULL;
571 goto error;
572 }
573
574 /* instantiate inode and assign the unopened fid to dentry */
575 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
576 if (IS_ERR(inode)) {
577 err = PTR_ERR(inode);
578 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
579 err);
580 goto error;
581 }
582 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
583 d_instantiate(dentry, inode);
584 err = v9fs_fid_add(dentry, fid);
585 if (err < 0)
586 goto error;
587 fid = NULL;
588 } else {
589 /* Not in cached mode. No need to populate inode with stat */
590 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
591 if (IS_ERR(inode)) {
592 err = PTR_ERR(inode);
593 goto error;
594 }
595 d_set_d_op(dentry, &v9fs_dentry_operations);
596 d_instantiate(dentry, inode);
597 }
598
599error:
600 if (fid)
601 p9_client_clunk(fid);
602
603 return err;
604}
605
606/**
607 * v9fs_vfs_link_dotl - create a hardlink for dotl
608 * @old_dentry: dentry for file to link to
609 * @dir: inode destination for new link
610 * @dentry: dentry for link
611 *
612 */
613
614static int
615v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
616 struct dentry *dentry)
617{
618 int err;
619 struct p9_fid *dfid, *oldfid;
620 char *name;
621 struct v9fs_session_info *v9ses;
622 struct dentry *dir_dentry;
623
624 P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
625 dir->i_ino, old_dentry->d_name.name,
626 dentry->d_name.name);
627
628 v9ses = v9fs_inode2v9ses(dir);
629 dir_dentry = v9fs_dentry_from_dir_inode(dir);
630 dfid = v9fs_fid_lookup(dir_dentry);
631 if (IS_ERR(dfid))
632 return PTR_ERR(dfid);
633
634 oldfid = v9fs_fid_lookup(old_dentry);
635 if (IS_ERR(oldfid))
636 return PTR_ERR(oldfid);
637
638 name = (char *) dentry->d_name.name;
639
640 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
641
642 if (err < 0) {
643 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
644 return err;
645 }
646
647 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
648 /* Get the latest stat info from server. */
649 struct p9_fid *fid;
650 struct p9_stat_dotl *st;
651
652 fid = v9fs_fid_lookup(old_dentry);
653 if (IS_ERR(fid))
654 return PTR_ERR(fid);
655
656 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
657 if (IS_ERR(st))
658 return PTR_ERR(st);
659
660 v9fs_stat2inode_dotl(st, old_dentry->d_inode);
661
662 kfree(st);
663 } else {
664 /* Caching disabled. No need to get upto date stat info.
665 * This dentry will be released immediately. So, just hold the
666 * inode
667 */
668 ihold(old_dentry->d_inode);
669 }
670
671 d_set_d_op(dentry, old_dentry->d_op);
672 d_instantiate(dentry, old_dentry->d_inode);
673
674 return err;
675}
676
677/**
678 * v9fs_vfs_mknod_dotl - create a special file
679 * @dir: inode destination for new link
680 * @dentry: dentry for file
681 * @mode: mode for creation
682 * @rdev: device associated with special file
683 *
684 */
685static int
686v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
687 dev_t rdev)
688{
689 int err;
690 char *name;
691 mode_t mode;
692 struct v9fs_session_info *v9ses;
693 struct p9_fid *fid = NULL, *dfid = NULL;
694 struct inode *inode;
695 gid_t gid;
696 struct p9_qid qid;
697 struct dentry *dir_dentry;
698 struct posix_acl *dacl = NULL, *pacl = NULL;
699
700 P9_DPRINTK(P9_DEBUG_VFS,
701 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
702 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
703
704 if (!new_valid_dev(rdev))
705 return -EINVAL;
706
707 v9ses = v9fs_inode2v9ses(dir);
708 dir_dentry = v9fs_dentry_from_dir_inode(dir);
709 dfid = v9fs_fid_lookup(dir_dentry);
710 if (IS_ERR(dfid)) {
711 err = PTR_ERR(dfid);
712 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
713 dfid = NULL;
714 goto error;
715 }
716
717 gid = v9fs_get_fsgid_for_create(dir);
718 mode = omode;
719 /* Update mode based on ACL value */
720 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
721 if (err) {
722 P9_DPRINTK(P9_DEBUG_VFS,
723 "Failed to get acl values in mknod %d\n", err);
724 goto error;
725 }
726 name = (char *) dentry->d_name.name;
727
728 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
729 if (err < 0)
730 goto error;
731
732 /* instantiate inode and assign the unopened fid to the dentry */
733 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
734 fid = p9_client_walk(dfid, 1, &name, 1);
735 if (IS_ERR(fid)) {
736 err = PTR_ERR(fid);
737 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
738 err);
739 fid = NULL;
740 goto error;
741 }
742
743 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
744 if (IS_ERR(inode)) {
745 err = PTR_ERR(inode);
746 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
747 err);
748 goto error;
749 }
750 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
751 d_instantiate(dentry, inode);
752 err = v9fs_fid_add(dentry, fid);
753 if (err < 0)
754 goto error;
755 fid = NULL;
756 } else {
757 /*
758 * Not in cached mode. No need to populate inode with stat.
759 * socket syscall returns a fd, so we need instantiate
760 */
761 inode = v9fs_get_inode(dir->i_sb, mode);
762 if (IS_ERR(inode)) {
763 err = PTR_ERR(inode);
764 goto error;
765 }
766 d_set_d_op(dentry, &v9fs_dentry_operations);
767 d_instantiate(dentry, inode);
768 }
769 /* Now set the ACL based on the default value */
770 v9fs_set_create_acl(dentry, dacl, pacl);
771error:
772 if (fid)
773 p9_client_clunk(fid);
774 return err;
775}
776
777static int
778v9fs_vfs_readlink_dotl(struct dentry *dentry, char *buffer, int buflen)
779{
780 int retval;
781 struct p9_fid *fid;
782 char *target = NULL;
783
784 P9_DPRINTK(P9_DEBUG_VFS, " %s\n", dentry->d_name.name);
785 retval = -EPERM;
786 fid = v9fs_fid_lookup(dentry);
787 if (IS_ERR(fid))
788 return PTR_ERR(fid);
789
790 retval = p9_client_readlink(fid, &target);
791 if (retval < 0)
792 return retval;
793
794 strncpy(buffer, target, buflen);
795 P9_DPRINTK(P9_DEBUG_VFS, "%s -> %s\n", dentry->d_name.name, buffer);
796
797 retval = strnlen(buffer, buflen);
798 return retval;
799}
800
801/**
802 * v9fs_vfs_follow_link_dotl - follow a symlink path
803 * @dentry: dentry for symlink
804 * @nd: nameidata
805 *
806 */
807
808static void *
809v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
810{
811 int len = 0;
812 char *link = __getname();
813
814 P9_DPRINTK(P9_DEBUG_VFS, "%s n", dentry->d_name.name);
815
816 if (!link)
817 link = ERR_PTR(-ENOMEM);
818 else {
819 len = v9fs_vfs_readlink_dotl(dentry, link, PATH_MAX);
820 if (len < 0) {
821 __putname(link);
822 link = ERR_PTR(len);
823 } else
824 link[min(len, PATH_MAX-1)] = 0;
825 }
826 nd_set_link(nd, link);
827
828 return NULL;
829}
830
831const struct inode_operations v9fs_dir_inode_operations_dotl = {
832 .create = v9fs_vfs_create_dotl,
833 .lookup = v9fs_vfs_lookup,
834 .link = v9fs_vfs_link_dotl,
835 .symlink = v9fs_vfs_symlink_dotl,
836 .unlink = v9fs_vfs_unlink,
837 .mkdir = v9fs_vfs_mkdir_dotl,
838 .rmdir = v9fs_vfs_rmdir,
839 .mknod = v9fs_vfs_mknod_dotl,
840 .rename = v9fs_vfs_rename,
841 .getattr = v9fs_vfs_getattr_dotl,
842 .setattr = v9fs_vfs_setattr_dotl,
843 .setxattr = generic_setxattr,
844 .getxattr = generic_getxattr,
845 .removexattr = generic_removexattr,
846 .listxattr = v9fs_listxattr,
847 .check_acl = v9fs_check_acl,
848};
849
850const struct inode_operations v9fs_file_inode_operations_dotl = {
851 .getattr = v9fs_vfs_getattr_dotl,
852 .setattr = v9fs_vfs_setattr_dotl,
853 .setxattr = generic_setxattr,
854 .getxattr = generic_getxattr,
855 .removexattr = generic_removexattr,
856 .listxattr = v9fs_listxattr,
857 .check_acl = v9fs_check_acl,
858};
859
860const struct inode_operations v9fs_symlink_inode_operations_dotl = {
861 .readlink = v9fs_vfs_readlink_dotl,
862 .follow_link = v9fs_vfs_follow_link_dotl,
863 .put_link = v9fs_vfs_put_link,
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};
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