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fs/9p: We need not writeback dirty pages during close
[deliverable/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 <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
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;
3cf387d7 145 struct p9_fid *dfid, *ofid, *inode_fid;
53c06f4e
AK		 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 }
53c06f4e 199
af7542fc
AK		 200 /* instantiate inode and assign the unopened fid to the dentry */
201 fid = p9_client_walk(dfid, 1, &name, 1);
202 if (IS_ERR(fid)) {
203 err = PTR_ERR(fid);
c25a61f5 204 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
53c06f4e 205 fid = NULL;
af7542fc 206 goto error;
53c06f4e 207 }
af7542fc
AK		 208 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
209 if (IS_ERR(inode)) {
210 err = PTR_ERR(inode);
211 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
212 goto error;
213 }
af7542fc
AK		 214 d_instantiate(dentry, inode);
215 err = v9fs_fid_add(dentry, fid);
216 if (err < 0)
217 goto error;
218
53c06f4e
AK		 219 /* Now set the ACL based on the default value */
220 v9fs_set_create_acl(dentry, dacl, pacl);
3cf387d7
AK		 221 if (v9ses->cache && !inode->i_private) {
222 /*
223 * clone a fid and add it to inode->i_private
224 * we do it during open time instead of
225 * page dirty time via write_begin/page_mkwrite
226 * because we want write after unlink usecase
227 * to work.
228 */
229 inode_fid = v9fs_writeback_fid(dentry);
230 if (IS_ERR(inode_fid)) {
231 err = PTR_ERR(inode_fid);
232 goto error;
233 }
234 inode->i_private = (void *) inode_fid;
235 }
af7542fc
AK		 236 /* Since we are opening a file, assign the open fid to the file */
237 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
238 if (IS_ERR(filp)) {
53c06f4e 239 p9_client_clunk(ofid);
af7542fc
AK		 240 return PTR_ERR(filp);
241 }
242 filp->private_data = ofid;
46848de0
AK		 243#ifdef CONFIG_9P_FSCACHE
244 if (v9ses->cache)
245 v9fs_cache_inode_set_cookie(inode, filp);
246#endif
53c06f4e
AK		 247 return 0;
248
249error:
250 if (ofid)
251 p9_client_clunk(ofid);
252 if (fid)
253 p9_client_clunk(fid);
254 return err;
255}
256
257/**
258 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
259 * @dir: inode that is being unlinked
260 * @dentry: dentry that is being unlinked
261 * @mode: mode for new directory
262 *
263 */
264
265static int v9fs_vfs_mkdir_dotl(struct inode *dir,
266 struct dentry *dentry, int omode)
267{
268 int err;
269 struct v9fs_session_info *v9ses;
270 struct p9_fid *fid = NULL, *dfid = NULL;
271 gid_t gid;
272 char *name;
273 mode_t mode;
274 struct inode *inode;
275 struct p9_qid qid;
276 struct dentry *dir_dentry;
277 struct posix_acl *dacl = NULL, *pacl = NULL;
278
279 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
280 err = 0;
281 v9ses = v9fs_inode2v9ses(dir);
282
283 omode |= S_IFDIR;
284 if (dir->i_mode & S_ISGID)
285 omode |= S_ISGID;
286
287 dir_dentry = v9fs_dentry_from_dir_inode(dir);
288 dfid = v9fs_fid_lookup(dir_dentry);
289 if (IS_ERR(dfid)) {
290 err = PTR_ERR(dfid);
291 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
292 dfid = NULL;
293 goto error;
294 }
295
296 gid = v9fs_get_fsgid_for_create(dir);
297 mode = omode;
298 /* Update mode based on ACL value */
299 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
300 if (err) {
301 P9_DPRINTK(P9_DEBUG_VFS,
302 "Failed to get acl values in mkdir %d\n", err);
303 goto error;
304 }
305 name = (char *) dentry->d_name.name;
306 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
307 if (err < 0)
308 goto error;
309
310 /* instantiate inode and assign the unopened fid to the dentry */
311 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
312 fid = p9_client_walk(dfid, 1, &name, 1);
313 if (IS_ERR(fid)) {
314 err = PTR_ERR(fid);
315 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
316 err);
317 fid = NULL;
318 goto error;
319 }
320
321 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
322 if (IS_ERR(inode)) {
323 err = PTR_ERR(inode);
324 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
325 err);
326 goto error;
327 }
53c06f4e
AK		 328 d_instantiate(dentry, inode);
329 err = v9fs_fid_add(dentry, fid);
330 if (err < 0)
331 goto error;
332 fid = NULL;
333 } else {
334 /*
335 * Not in cached mode. No need to populate
336 * inode with stat. We need to get an inode
337 * so that we can set the acl with dentry
338 */
339 inode = v9fs_get_inode(dir->i_sb, mode);
340 if (IS_ERR(inode)) {
341 err = PTR_ERR(inode);
342 goto error;
343 }
53c06f4e
AK		 344 d_instantiate(dentry, inode);
345 }
346 /* Now set the ACL based on the default value */
347 v9fs_set_create_acl(dentry, dacl, pacl);
348
349error:
350 if (fid)
351 p9_client_clunk(fid);
352 return err;
353}
354
355static int
356v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
357 struct kstat *stat)
358{
359 int err;
360 struct v9fs_session_info *v9ses;
361 struct p9_fid *fid;
362 struct p9_stat_dotl *st;
363
364 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
365 err = -EPERM;
366 v9ses = v9fs_inode2v9ses(dentry->d_inode);
367 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
368 return simple_getattr(mnt, dentry, stat);
369
370 fid = v9fs_fid_lookup(dentry);
371 if (IS_ERR(fid))
372 return PTR_ERR(fid);
373
374 /* Ask for all the fields in stat structure. Server will return
375 * whatever it supports
376 */
377
378 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
379 if (IS_ERR(st))
380 return PTR_ERR(st);
381
382 v9fs_stat2inode_dotl(st, dentry->d_inode);
383 generic_fillattr(dentry->d_inode, stat);
384 /* Change block size to what the server returned */
385 stat->blksize = st->st_blksize;
386
387 kfree(st);
388 return 0;
389}
390
391/**
392 * v9fs_vfs_setattr_dotl - set file metadata
393 * @dentry: file whose metadata to set
394 * @iattr: metadata assignment structure
395 *
396 */
397
398int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
399{
400 int retval;
401 struct v9fs_session_info *v9ses;
402 struct p9_fid *fid;
403 struct p9_iattr_dotl p9attr;
404
405 P9_DPRINTK(P9_DEBUG_VFS, "\n");
406
407 retval = inode_change_ok(dentry->d_inode, iattr);
408 if (retval)
409 return retval;
410
411 p9attr.valid = iattr->ia_valid;
412 p9attr.mode = iattr->ia_mode;
413 p9attr.uid = iattr->ia_uid;
414 p9attr.gid = iattr->ia_gid;
415 p9attr.size = iattr->ia_size;
416 p9attr.atime_sec = iattr->ia_atime.tv_sec;
417 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
418 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
419 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
420
421 retval = -EPERM;
422 v9ses = v9fs_inode2v9ses(dentry->d_inode);
423 fid = v9fs_fid_lookup(dentry);
424 if (IS_ERR(fid))
425 return PTR_ERR(fid);
426
427 retval = p9_client_setattr(fid, &p9attr);
428 if (retval < 0)
429 return retval;
430
431 if ((iattr->ia_valid & ATTR_SIZE) &&
432 iattr->ia_size != i_size_read(dentry->d_inode)) {
433 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
434 if (retval)
435 return retval;
436 }
437
438 setattr_copy(dentry->d_inode, iattr);
439 mark_inode_dirty(dentry->d_inode);
440 if (iattr->ia_valid & ATTR_MODE) {
441 /* We also want to update ACL when we update mode bits */
442 retval = v9fs_acl_chmod(dentry);
443 if (retval < 0)
444 return retval;
445 }
446 return 0;
447}
448
449/**
450 * v9fs_stat2inode_dotl - populate an inode structure with stat info
451 * @stat: stat structure
452 * @inode: inode to populate
453 * @sb: superblock of filesystem
454 *
455 */
456
457void
458v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
459{
460
461 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
462 inode->i_atime.tv_sec = stat->st_atime_sec;
463 inode->i_atime.tv_nsec = stat->st_atime_nsec;
464 inode->i_mtime.tv_sec = stat->st_mtime_sec;
465 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
466 inode->i_ctime.tv_sec = stat->st_ctime_sec;
467 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
468 inode->i_uid = stat->st_uid;
469 inode->i_gid = stat->st_gid;
470 inode->i_nlink = stat->st_nlink;
471 inode->i_mode = stat->st_mode;
472 inode->i_rdev = new_decode_dev(stat->st_rdev);
473
474 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
475 init_special_inode(inode, inode->i_mode, inode->i_rdev);
476
477 i_size_write(inode, stat->st_size);
478 inode->i_blocks = stat->st_blocks;
479 } else {
480 if (stat->st_result_mask & P9_STATS_ATIME) {
481 inode->i_atime.tv_sec = stat->st_atime_sec;
482 inode->i_atime.tv_nsec = stat->st_atime_nsec;
483 }
484 if (stat->st_result_mask & P9_STATS_MTIME) {
485 inode->i_mtime.tv_sec = stat->st_mtime_sec;
486 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
487 }
488 if (stat->st_result_mask & P9_STATS_CTIME) {
489 inode->i_ctime.tv_sec = stat->st_ctime_sec;
490 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
491 }
492 if (stat->st_result_mask & P9_STATS_UID)
493 inode->i_uid = stat->st_uid;
494 if (stat->st_result_mask & P9_STATS_GID)
495 inode->i_gid = stat->st_gid;
496 if (stat->st_result_mask & P9_STATS_NLINK)
497 inode->i_nlink = stat->st_nlink;
498 if (stat->st_result_mask & P9_STATS_MODE) {
499 inode->i_mode = stat->st_mode;
500 if ((S_ISBLK(inode->i_mode)) ||
501 (S_ISCHR(inode->i_mode)))
502 init_special_inode(inode, inode->i_mode,
503 inode->i_rdev);
504 }
505 if (stat->st_result_mask & P9_STATS_RDEV)
506 inode->i_rdev = new_decode_dev(stat->st_rdev);
507 if (stat->st_result_mask & P9_STATS_SIZE)
508 i_size_write(inode, stat->st_size);
509 if (stat->st_result_mask & P9_STATS_BLOCKS)
510 inode->i_blocks = stat->st_blocks;
511 }
512 if (stat->st_result_mask & P9_STATS_GEN)
513 inode->i_generation = stat->st_gen;
514
515 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
516 * because the inode structure does not have fields for them.
517 */
518}
519
520static int
521v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
522 const char *symname)
523{
524 struct v9fs_session_info *v9ses;
525 struct p9_fid *dfid;
526 struct p9_fid *fid = NULL;
527 struct inode *inode;
528 struct p9_qid qid;
529 char *name;
530 int err;
531 gid_t gid;
532
533 name = (char *) dentry->d_name.name;
534 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
535 dir->i_ino, name, symname);
536 v9ses = v9fs_inode2v9ses(dir);
537
538 dfid = v9fs_fid_lookup(dentry->d_parent);
539 if (IS_ERR(dfid)) {
540 err = PTR_ERR(dfid);
541 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
542 return err;
543 }
544
545 gid = v9fs_get_fsgid_for_create(dir);
546
547 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
548 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
549
550 if (err < 0) {
551 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
552 goto error;
553 }
554
555 if (v9ses->cache) {
556 /* Now walk from the parent so we can get an unopened fid. */
557 fid = p9_client_walk(dfid, 1, &name, 1);
558 if (IS_ERR(fid)) {
559 err = PTR_ERR(fid);
560 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
561 err);
562 fid = NULL;
563 goto error;
564 }
565
566 /* instantiate inode and assign the unopened fid to dentry */
567 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
568 if (IS_ERR(inode)) {
569 err = PTR_ERR(inode);
570 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
571 err);
572 goto error;
573 }
53c06f4e
AK		 574 d_instantiate(dentry, inode);
575 err = v9fs_fid_add(dentry, fid);
576 if (err < 0)
577 goto error;
578 fid = NULL;
579 } else {
580 /* Not in cached mode. No need to populate inode with stat */
581 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
582 if (IS_ERR(inode)) {
583 err = PTR_ERR(inode);
584 goto error;
585 }
53c06f4e
AK		 586 d_instantiate(dentry, inode);
587 }
588
589error:
590 if (fid)
591 p9_client_clunk(fid);
592
593 return err;
594}
595
596/**
597 * v9fs_vfs_link_dotl - create a hardlink for dotl
598 * @old_dentry: dentry for file to link to
599 * @dir: inode destination for new link
600 * @dentry: dentry for link
601 *
602 */
603
604static int
605v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
606 struct dentry *dentry)
607{
608 int err;
609 struct p9_fid *dfid, *oldfid;
610 char *name;
611 struct v9fs_session_info *v9ses;
612 struct dentry *dir_dentry;
613
614 P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
615 dir->i_ino, old_dentry->d_name.name,
616 dentry->d_name.name);
617
618 v9ses = v9fs_inode2v9ses(dir);
619 dir_dentry = v9fs_dentry_from_dir_inode(dir);
620 dfid = v9fs_fid_lookup(dir_dentry);
621 if (IS_ERR(dfid))
622 return PTR_ERR(dfid);
623
624 oldfid = v9fs_fid_lookup(old_dentry);
625 if (IS_ERR(oldfid))
626 return PTR_ERR(oldfid);
627
628 name = (char *) dentry->d_name.name;
629
630 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
631
632 if (err < 0) {
633 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
634 return err;
635 }
636
637 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
638 /* Get the latest stat info from server. */
639 struct p9_fid *fid;
640 struct p9_stat_dotl *st;
641
642 fid = v9fs_fid_lookup(old_dentry);
643 if (IS_ERR(fid))
644 return PTR_ERR(fid);
645
646 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
647 if (IS_ERR(st))
648 return PTR_ERR(st);
649
650 v9fs_stat2inode_dotl(st, old_dentry->d_inode);
651
652 kfree(st);
53c06f4e 653 }
20656a49 654 ihold(old_dentry->d_inode);
53c06f4e
AK		 655 d_instantiate(dentry, old_dentry->d_inode);
656
657 return err;
658}
659
660/**
661 * v9fs_vfs_mknod_dotl - create a special file
662 * @dir: inode destination for new link
663 * @dentry: dentry for file
664 * @mode: mode for creation
665 * @rdev: device associated with special file
666 *
667 */
668static int
669v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
670 dev_t rdev)
671{
672 int err;
673 char *name;
674 mode_t mode;
675 struct v9fs_session_info *v9ses;
676 struct p9_fid *fid = NULL, *dfid = NULL;
677 struct inode *inode;
678 gid_t gid;
679 struct p9_qid qid;
680 struct dentry *dir_dentry;
681 struct posix_acl *dacl = NULL, *pacl = NULL;
682
683 P9_DPRINTK(P9_DEBUG_VFS,
684 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
685 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
686
687 if (!new_valid_dev(rdev))
688 return -EINVAL;
689
690 v9ses = v9fs_inode2v9ses(dir);
691 dir_dentry = v9fs_dentry_from_dir_inode(dir);
692 dfid = v9fs_fid_lookup(dir_dentry);
693 if (IS_ERR(dfid)) {
694 err = PTR_ERR(dfid);
695 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
696 dfid = NULL;
697 goto error;
698 }
699
700 gid = v9fs_get_fsgid_for_create(dir);
701 mode = omode;
702 /* Update mode based on ACL value */
703 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
704 if (err) {
705 P9_DPRINTK(P9_DEBUG_VFS,
706 "Failed to get acl values in mknod %d\n", err);
707 goto error;
708 }
709 name = (char *) dentry->d_name.name;
710
711 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
712 if (err < 0)
713 goto error;
714
715 /* instantiate inode and assign the unopened fid to the dentry */
716 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
717 fid = p9_client_walk(dfid, 1, &name, 1);
718 if (IS_ERR(fid)) {
719 err = PTR_ERR(fid);
720 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
721 err);
722 fid = NULL;
723 goto error;
724 }
725
726 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
727 if (IS_ERR(inode)) {
728 err = PTR_ERR(inode);
729 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
730 err);
731 goto error;
732 }
53c06f4e
AK		 733 d_instantiate(dentry, inode);
734 err = v9fs_fid_add(dentry, fid);
735 if (err < 0)
736 goto error;
737 fid = NULL;
738 } else {
739 /*
740 * Not in cached mode. No need to populate inode with stat.
741 * socket syscall returns a fd, so we need instantiate
742 */
743 inode = v9fs_get_inode(dir->i_sb, mode);
744 if (IS_ERR(inode)) {
745 err = PTR_ERR(inode);
746 goto error;
747 }
53c06f4e
AK		 748 d_instantiate(dentry, inode);
749 }
750 /* Now set the ACL based on the default value */
751 v9fs_set_create_acl(dentry, dacl, pacl);
752error:
753 if (fid)
754 p9_client_clunk(fid);
755 return err;
756}
757
53c06f4e
AK		 758/**
759 * v9fs_vfs_follow_link_dotl - follow a symlink path
760 * @dentry: dentry for symlink
761 * @nd: nameidata
762 *
763 */
764
765static void *
766v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
767{
31b6ceac
MK		 768 int retval;
769 struct p9_fid *fid;
53c06f4e 770 char *link = __getname();
31b6ceac 771 char *target;
53c06f4e 772
31b6ceac 773 P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
53c06f4e 774
31b6ceac 775 if (!link) {
53c06f4e 776 link = ERR_PTR(-ENOMEM);
31b6ceac 777 goto ndset;
53c06f4e 778 }
31b6ceac
MK		 779 fid = v9fs_fid_lookup(dentry);
780 if (IS_ERR(fid)) {
781 __putname(link);
782 link = ERR_PTR(PTR_ERR(fid));
783 goto ndset;
784 }
785 retval = p9_client_readlink(fid, &target);
786 if (!retval) {
787 strcpy(link, target);
788 kfree(target);
789 goto ndset;
790 }
791 __putname(link);
792 link = ERR_PTR(retval);
793ndset:
53c06f4e 794 nd_set_link(nd, link);
53c06f4e
AK		 795 return NULL;
796}
797
798const struct inode_operations v9fs_dir_inode_operations_dotl = {
799 .create = v9fs_vfs_create_dotl,
800 .lookup = v9fs_vfs_lookup,
801 .link = v9fs_vfs_link_dotl,
802 .symlink = v9fs_vfs_symlink_dotl,
803 .unlink = v9fs_vfs_unlink,
804 .mkdir = v9fs_vfs_mkdir_dotl,
805 .rmdir = v9fs_vfs_rmdir,
806 .mknod = v9fs_vfs_mknod_dotl,
807 .rename = v9fs_vfs_rename,
808 .getattr = v9fs_vfs_getattr_dotl,
809 .setattr = v9fs_vfs_setattr_dotl,
810 .setxattr = generic_setxattr,
811 .getxattr = generic_getxattr,
812 .removexattr = generic_removexattr,
813 .listxattr = v9fs_listxattr,
814 .check_acl = v9fs_check_acl,
815};
816
817const struct inode_operations v9fs_file_inode_operations_dotl = {
818 .getattr = v9fs_vfs_getattr_dotl,
819 .setattr = v9fs_vfs_setattr_dotl,
820 .setxattr = generic_setxattr,
821 .getxattr = generic_getxattr,
822 .removexattr = generic_removexattr,
823 .listxattr = v9fs_listxattr,
824 .check_acl = v9fs_check_acl,
825};
826
827const struct inode_operations v9fs_symlink_inode_operations_dotl = {
31b6ceac 828 .readlink = generic_readlink,
53c06f4e
AK		 829 .follow_link = v9fs_vfs_follow_link_dotl,
830 .put_link = v9fs_vfs_put_link,
831 .getattr = v9fs_vfs_getattr_dotl,
832 .setattr = v9fs_vfs_setattr_dotl,
833 .setxattr = generic_setxattr,
834 .getxattr = generic_getxattr,
835 .removexattr = generic_removexattr,
836 .listxattr = v9fs_listxattr,
837};
Linux kernel - Deliverables
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