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TOMOYO Linux Cross Reference
Linux/fs/9p/vfs_inode_dotl.c

Version: ~ [ linux-5.6-rc3 ] ~ [ linux-5.5.6 ] ~ [ linux-5.4.22 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.106 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.171 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.214 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.214 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.82 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
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  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 
 50 static int
 51 v9fs_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 
 60 static 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 
 77 static 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 
 89 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
 90 {
 91         struct v9fs_inode *v9inode = V9FS_I(inode);
 92         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
 93 
 94         /* don't match inode of different type */
 95         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
 96                 return 0;
 97 
 98         if (inode->i_generation != st->st_gen)
 99                 return 0;
100 
101         /* compare qid details */
102         if (memcmp(&v9inode->qid.version,
103                    &st->qid.version, sizeof(v9inode->qid.version)))
104                 return 0;
105 
106         if (v9inode->qid.type != st->qid.type)
107                 return 0;
108         return 1;
109 }
110 
111 /* Always get a new inode */
112 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
113 {
114         return 0;
115 }
116 
117 static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
118 {
119         struct v9fs_inode *v9inode = V9FS_I(inode);
120         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
121 
122         memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
123         inode->i_generation = st->st_gen;
124         return 0;
125 }
126 
127 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
128                                         struct p9_qid *qid,
129                                         struct p9_fid *fid,
130                                         struct p9_stat_dotl *st,
131                                         int new)
132 {
133         int retval;
134         unsigned long i_ino;
135         struct inode *inode;
136         struct v9fs_session_info *v9ses = sb->s_fs_info;
137         int (*test)(struct inode *, void *);
138 
139         if (new)
140                 test = v9fs_test_new_inode_dotl;
141         else
142                 test = v9fs_test_inode_dotl;
143 
144         i_ino = v9fs_qid2ino(qid);
145         inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
146         if (!inode)
147                 return ERR_PTR(-ENOMEM);
148         if (!(inode->i_state & I_NEW))
149                 return inode;
150         /*
151          * initialize the inode with the stat info
152          * FIXME!! we may need support for stale inodes
153          * later.
154          */
155         inode->i_ino = i_ino;
156         retval = v9fs_init_inode(v9ses, inode,
157                                  st->st_mode, new_decode_dev(st->st_rdev));
158         if (retval)
159                 goto error;
160 
161         v9fs_stat2inode_dotl(st, inode);
162 #ifdef CONFIG_9P_FSCACHE
163         v9fs_cache_inode_get_cookie(inode);
164 #endif
165         retval = v9fs_get_acl(inode, fid);
166         if (retval)
167                 goto error;
168 
169         unlock_new_inode(inode);
170         return inode;
171 error:
172         unlock_new_inode(inode);
173         iput(inode);
174         return ERR_PTR(retval);
175 
176 }
177 
178 struct inode *
179 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
180                          struct super_block *sb, int new)
181 {
182         struct p9_stat_dotl *st;
183         struct inode *inode = NULL;
184 
185         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
186         if (IS_ERR(st))
187                 return ERR_CAST(st);
188 
189         inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
190         kfree(st);
191         return inode;
192 }
193 
194 struct dotl_openflag_map {
195         int open_flag;
196         int dotl_flag;
197 };
198 
199 static int v9fs_mapped_dotl_flags(int flags)
200 {
201         int i;
202         int rflags = 0;
203         struct dotl_openflag_map dotl_oflag_map[] = {
204                 { O_CREAT,      P9_DOTL_CREATE },
205                 { O_EXCL,       P9_DOTL_EXCL },
206                 { O_NOCTTY,     P9_DOTL_NOCTTY },
207                 { O_TRUNC,      P9_DOTL_TRUNC },
208                 { O_APPEND,     P9_DOTL_APPEND },
209                 { O_NONBLOCK,   P9_DOTL_NONBLOCK },
210                 { O_DSYNC,      P9_DOTL_DSYNC },
211                 { FASYNC,       P9_DOTL_FASYNC },
212                 { O_DIRECT,     P9_DOTL_DIRECT },
213                 { O_LARGEFILE,  P9_DOTL_LARGEFILE },
214                 { O_DIRECTORY,  P9_DOTL_DIRECTORY },
215                 { O_NOFOLLOW,   P9_DOTL_NOFOLLOW },
216                 { O_NOATIME,    P9_DOTL_NOATIME },
217                 { O_CLOEXEC,    P9_DOTL_CLOEXEC },
218                 { O_SYNC,       P9_DOTL_SYNC},
219         };
220         for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
221                 if (flags & dotl_oflag_map[i].open_flag)
222                         rflags |= dotl_oflag_map[i].dotl_flag;
223         }
224         return rflags;
225 }
226 
227 /**
228  * v9fs_open_to_dotl_flags- convert Linux specific open flags to
229  * plan 9 open flag.
230  * @flags: flags to convert
231  */
232 int v9fs_open_to_dotl_flags(int flags)
233 {
234         int rflags = 0;
235 
236         /*
237          * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
238          * and P9_DOTL_NOACCESS
239          */
240         rflags |= flags & O_ACCMODE;
241         rflags |= v9fs_mapped_dotl_flags(flags);
242 
243         return rflags;
244 }
245 
246 /**
247  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
248  * @dir: directory inode that is being created
249  * @dentry:  dentry that is being deleted
250  * @mode: create permissions
251  * @nd: path information
252  *
253  */
254 
255 static int
256 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
257                 struct nameidata *nd)
258 {
259         int err = 0;
260         gid_t gid;
261         int flags;
262         umode_t mode;
263         char *name = NULL;
264         struct file *filp;
265         struct p9_qid qid;
266         struct inode *inode;
267         struct p9_fid *fid = NULL;
268         struct v9fs_inode *v9inode;
269         struct p9_fid *dfid, *ofid, *inode_fid;
270         struct v9fs_session_info *v9ses;
271         struct posix_acl *pacl = NULL, *dacl = NULL;
272 
273         v9ses = v9fs_inode2v9ses(dir);
274         if (nd)
275                 flags = nd->intent.open.flags;
276         else {
277                 /*
278                  * create call without LOOKUP_OPEN is due
279                  * to mknod of regular files. So use mknod
280                  * operation.
281                  */
282                 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
283         }
284 
285         name = (char *) dentry->d_name.name;
286         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
287                         "mode:0x%x\n", name, flags, omode);
288 
289         dfid = v9fs_fid_lookup(dentry->d_parent);
290         if (IS_ERR(dfid)) {
291                 err = PTR_ERR(dfid);
292                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
293                 return err;
294         }
295 
296         /* clone a fid to use for creation */
297         ofid = p9_client_walk(dfid, 0, NULL, 1);
298         if (IS_ERR(ofid)) {
299                 err = PTR_ERR(ofid);
300                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
301                 return err;
302         }
303 
304         gid = v9fs_get_fsgid_for_create(dir);
305 
306         mode = omode;
307         /* Update mode based on ACL value */
308         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
309         if (err) {
310                 P9_DPRINTK(P9_DEBUG_VFS,
311                            "Failed to get acl values in creat %d\n", err);
312                 goto error;
313         }
314         err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
315                                     mode, gid, &qid);
316         if (err < 0) {
317                 P9_DPRINTK(P9_DEBUG_VFS,
318                                 "p9_client_open_dotl failed in creat %d\n",
319                                 err);
320                 goto error;
321         }
322         v9fs_invalidate_inode_attr(dir);
323 
324         /* instantiate inode and assign the unopened fid to the dentry */
325         fid = p9_client_walk(dfid, 1, &name, 1);
326         if (IS_ERR(fid)) {
327                 err = PTR_ERR(fid);
328                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
329                 fid = NULL;
330                 goto error;
331         }
332         inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
333         if (IS_ERR(inode)) {
334                 err = PTR_ERR(inode);
335                 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
336                 goto error;
337         }
338         err = v9fs_fid_add(dentry, fid);
339         if (err < 0)
340                 goto error;
341         d_instantiate(dentry, inode);
342 
343         /* Now set the ACL based on the default value */
344         v9fs_set_create_acl(dentry, &dacl, &pacl);
345 
346         v9inode = V9FS_I(inode);
347         mutex_lock(&v9inode->v_mutex);
348         if (v9ses->cache && !v9inode->writeback_fid &&
349             ((flags & O_ACCMODE) != O_RDONLY)) {
350                 /*
351                  * clone a fid and add it to writeback_fid
352                  * we do it during open time instead of
353                  * page dirty time via write_begin/page_mkwrite
354                  * because we want write after unlink usecase
355                  * to work.
356                  */
357                 inode_fid = v9fs_writeback_fid(dentry);
358                 if (IS_ERR(inode_fid)) {
359                         err = PTR_ERR(inode_fid);
360                         mutex_unlock(&v9inode->v_mutex);
361                         goto err_clunk_old_fid;
362                 }
363                 v9inode->writeback_fid = (void *) inode_fid;
364         }
365         mutex_unlock(&v9inode->v_mutex);
366         /* Since we are opening a file, assign the open fid to the file */
367         filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
368         if (IS_ERR(filp)) {
369                 err = PTR_ERR(filp);
370                 goto err_clunk_old_fid;
371         }
372         filp->private_data = ofid;
373 #ifdef CONFIG_9P_FSCACHE
374         if (v9ses->cache)
375                 v9fs_cache_inode_set_cookie(inode, filp);
376 #endif
377         return 0;
378 
379 error:
380         if (fid)
381                 p9_client_clunk(fid);
382 err_clunk_old_fid:
383         if (ofid)
384                 p9_client_clunk(ofid);
385         v9fs_set_create_acl(NULL, &dacl, &pacl);
386         return err;
387 }
388 
389 /**
390  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
391  * @dir:  inode that is being unlinked
392  * @dentry: dentry that is being unlinked
393  * @mode: mode for new directory
394  *
395  */
396 
397 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
398                                struct dentry *dentry, int omode)
399 {
400         int err;
401         struct v9fs_session_info *v9ses;
402         struct p9_fid *fid = NULL, *dfid = NULL;
403         gid_t gid;
404         char *name;
405         umode_t mode;
406         struct inode *inode;
407         struct p9_qid qid;
408         struct dentry *dir_dentry;
409         struct posix_acl *dacl = NULL, *pacl = NULL;
410 
411         P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
412         err = 0;
413         v9ses = v9fs_inode2v9ses(dir);
414 
415         omode |= S_IFDIR;
416         if (dir->i_mode & S_ISGID)
417                 omode |= S_ISGID;
418 
419         dir_dentry = v9fs_dentry_from_dir_inode(dir);
420         dfid = v9fs_fid_lookup(dir_dentry);
421         if (IS_ERR(dfid)) {
422                 err = PTR_ERR(dfid);
423                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
424                 dfid = NULL;
425                 goto error;
426         }
427 
428         gid = v9fs_get_fsgid_for_create(dir);
429         mode = omode;
430         /* Update mode based on ACL value */
431         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
432         if (err) {
433                 P9_DPRINTK(P9_DEBUG_VFS,
434                            "Failed to get acl values in mkdir %d\n", err);
435                 goto error;
436         }
437         name = (char *) dentry->d_name.name;
438         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
439         if (err < 0)
440                 goto error;
441 
442         /* instantiate inode and assign the unopened fid to the dentry */
443         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
444                 fid = p9_client_walk(dfid, 1, &name, 1);
445                 if (IS_ERR(fid)) {
446                         err = PTR_ERR(fid);
447                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
448                                 err);
449                         fid = NULL;
450                         goto error;
451                 }
452 
453                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
454                 if (IS_ERR(inode)) {
455                         err = PTR_ERR(inode);
456                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
457                                 err);
458                         goto error;
459                 }
460                 err = v9fs_fid_add(dentry, fid);
461                 if (err < 0)
462                         goto error;
463                 d_instantiate(dentry, inode);
464                 fid = NULL;
465         } else {
466                 /*
467                  * Not in cached mode. No need to populate
468                  * inode with stat. We need to get an inode
469                  * so that we can set the acl with dentry
470                  */
471                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
472                 if (IS_ERR(inode)) {
473                         err = PTR_ERR(inode);
474                         goto error;
475                 }
476                 d_instantiate(dentry, inode);
477         }
478         /* Now set the ACL based on the default value */
479         v9fs_set_create_acl(dentry, &dacl, &pacl);
480         inc_nlink(dir);
481         v9fs_invalidate_inode_attr(dir);
482 error:
483         if (fid)
484                 p9_client_clunk(fid);
485         v9fs_set_create_acl(NULL, &dacl, &pacl);
486         return err;
487 }
488 
489 static int
490 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
491                  struct kstat *stat)
492 {
493         int err;
494         struct v9fs_session_info *v9ses;
495         struct p9_fid *fid;
496         struct p9_stat_dotl *st;
497 
498         P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
499         err = -EPERM;
500         v9ses = v9fs_dentry2v9ses(dentry);
501         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
502                 generic_fillattr(dentry->d_inode, stat);
503                 return 0;
504         }
505         fid = v9fs_fid_lookup(dentry);
506         if (IS_ERR(fid))
507                 return PTR_ERR(fid);
508 
509         /* Ask for all the fields in stat structure. Server will return
510          * whatever it supports
511          */
512 
513         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
514         if (IS_ERR(st))
515                 return PTR_ERR(st);
516 
517         v9fs_stat2inode_dotl(st, dentry->d_inode);
518         generic_fillattr(dentry->d_inode, stat);
519         /* Change block size to what the server returned */
520         stat->blksize = st->st_blksize;
521 
522         kfree(st);
523         return 0;
524 }
525 
526 /**
527  * v9fs_vfs_setattr_dotl - set file metadata
528  * @dentry: file whose metadata to set
529  * @iattr: metadata assignment structure
530  *
531  */
532 
533 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
534 {
535         int retval;
536         struct v9fs_session_info *v9ses;
537         struct p9_fid *fid;
538         struct p9_iattr_dotl p9attr;
539 
540         P9_DPRINTK(P9_DEBUG_VFS, "\n");
541 
542         retval = inode_change_ok(dentry->d_inode, iattr);
543         if (retval)
544                 return retval;
545 
546         p9attr.valid = iattr->ia_valid;
547         p9attr.mode = iattr->ia_mode;
548         p9attr.uid = iattr->ia_uid;
549         p9attr.gid = iattr->ia_gid;
550         p9attr.size = iattr->ia_size;
551         p9attr.atime_sec = iattr->ia_atime.tv_sec;
552         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
553         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
554         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
555 
556         retval = -EPERM;
557         v9ses = v9fs_dentry2v9ses(dentry);
558         fid = v9fs_fid_lookup(dentry);
559         if (IS_ERR(fid))
560                 return PTR_ERR(fid);
561 
562         /* Write all dirty data */
563         if (S_ISREG(dentry->d_inode->i_mode))
564                 filemap_write_and_wait(dentry->d_inode->i_mapping);
565 
566         retval = p9_client_setattr(fid, &p9attr);
567         if (retval < 0)
568                 return retval;
569 
570         if ((iattr->ia_valid & ATTR_SIZE) &&
571             iattr->ia_size != i_size_read(dentry->d_inode))
572                 truncate_setsize(dentry->d_inode, iattr->ia_size);
573 
574         v9fs_invalidate_inode_attr(dentry->d_inode);
575         setattr_copy(dentry->d_inode, iattr);
576         mark_inode_dirty(dentry->d_inode);
577         if (iattr->ia_valid & ATTR_MODE) {
578                 /* We also want to update ACL when we update mode bits */
579                 retval = v9fs_acl_chmod(dentry);
580                 if (retval < 0)
581                         return retval;
582         }
583         return 0;
584 }
585 
586 /**
587  * v9fs_stat2inode_dotl - populate an inode structure with stat info
588  * @stat: stat structure
589  * @inode: inode to populate
590  * @sb: superblock of filesystem
591  *
592  */
593 
594 void
595 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
596 {
597         mode_t mode;
598         struct v9fs_inode *v9inode = V9FS_I(inode);
599 
600         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
601                 inode->i_atime.tv_sec = stat->st_atime_sec;
602                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
603                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
604                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
605                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
606                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
607                 inode->i_uid = stat->st_uid;
608                 inode->i_gid = stat->st_gid;
609                 inode->i_nlink = stat->st_nlink;
610 
611                 mode = stat->st_mode & S_IALLUGO;
612                 mode |= inode->i_mode & ~S_IALLUGO;
613                 inode->i_mode = mode;
614 
615                 i_size_write(inode, stat->st_size);
616                 inode->i_blocks = stat->st_blocks;
617         } else {
618                 if (stat->st_result_mask & P9_STATS_ATIME) {
619                         inode->i_atime.tv_sec = stat->st_atime_sec;
620                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
621                 }
622                 if (stat->st_result_mask & P9_STATS_MTIME) {
623                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
624                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
625                 }
626                 if (stat->st_result_mask & P9_STATS_CTIME) {
627                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
628                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
629                 }
630                 if (stat->st_result_mask & P9_STATS_UID)
631                         inode->i_uid = stat->st_uid;
632                 if (stat->st_result_mask & P9_STATS_GID)
633                         inode->i_gid = stat->st_gid;
634                 if (stat->st_result_mask & P9_STATS_NLINK)
635                         inode->i_nlink = stat->st_nlink;
636                 if (stat->st_result_mask & P9_STATS_MODE) {
637                         inode->i_mode = stat->st_mode;
638                         if ((S_ISBLK(inode->i_mode)) ||
639                                                 (S_ISCHR(inode->i_mode)))
640                                 init_special_inode(inode, inode->i_mode,
641                                                                 inode->i_rdev);
642                 }
643                 if (stat->st_result_mask & P9_STATS_RDEV)
644                         inode->i_rdev = new_decode_dev(stat->st_rdev);
645                 if (stat->st_result_mask & P9_STATS_SIZE)
646                         i_size_write(inode, stat->st_size);
647                 if (stat->st_result_mask & P9_STATS_BLOCKS)
648                         inode->i_blocks = stat->st_blocks;
649         }
650         if (stat->st_result_mask & P9_STATS_GEN)
651                 inode->i_generation = stat->st_gen;
652 
653         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
654          * because the inode structure does not have fields for them.
655          */
656         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
657 }
658 
659 static int
660 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
661                 const char *symname)
662 {
663         int err;
664         gid_t gid;
665         char *name;
666         struct p9_qid qid;
667         struct inode *inode;
668         struct p9_fid *dfid;
669         struct p9_fid *fid = NULL;
670         struct v9fs_session_info *v9ses;
671 
672         name = (char *) dentry->d_name.name;
673         P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
674                         dir->i_ino, name, symname);
675         v9ses = v9fs_inode2v9ses(dir);
676 
677         dfid = v9fs_fid_lookup(dentry->d_parent);
678         if (IS_ERR(dfid)) {
679                 err = PTR_ERR(dfid);
680                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
681                 return err;
682         }
683 
684         gid = v9fs_get_fsgid_for_create(dir);
685 
686         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
687         err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
688 
689         if (err < 0) {
690                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
691                 goto error;
692         }
693 
694         v9fs_invalidate_inode_attr(dir);
695         if (v9ses->cache) {
696                 /* Now walk from the parent so we can get an unopened fid. */
697                 fid = p9_client_walk(dfid, 1, &name, 1);
698                 if (IS_ERR(fid)) {
699                         err = PTR_ERR(fid);
700                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
701                                         err);
702                         fid = NULL;
703                         goto error;
704                 }
705 
706                 /* instantiate inode and assign the unopened fid to dentry */
707                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
708                 if (IS_ERR(inode)) {
709                         err = PTR_ERR(inode);
710                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
711                                         err);
712                         goto error;
713                 }
714                 err = v9fs_fid_add(dentry, fid);
715                 if (err < 0)
716                         goto error;
717                 d_instantiate(dentry, inode);
718                 fid = NULL;
719         } else {
720                 /* Not in cached mode. No need to populate inode with stat */
721                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
722                 if (IS_ERR(inode)) {
723                         err = PTR_ERR(inode);
724                         goto error;
725                 }
726                 d_instantiate(dentry, inode);
727         }
728 
729 error:
730         if (fid)
731                 p9_client_clunk(fid);
732 
733         return err;
734 }
735 
736 /**
737  * v9fs_vfs_link_dotl - create a hardlink for dotl
738  * @old_dentry: dentry for file to link to
739  * @dir: inode destination for new link
740  * @dentry: dentry for link
741  *
742  */
743 
744 static int
745 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
746                 struct dentry *dentry)
747 {
748         int err;
749         char *name;
750         struct dentry *dir_dentry;
751         struct p9_fid *dfid, *oldfid;
752         struct v9fs_session_info *v9ses;
753 
754         P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
755                         dir->i_ino, old_dentry->d_name.name,
756                         dentry->d_name.name);
757 
758         v9ses = v9fs_inode2v9ses(dir);
759         dir_dentry = v9fs_dentry_from_dir_inode(dir);
760         dfid = v9fs_fid_lookup(dir_dentry);
761         if (IS_ERR(dfid))
762                 return PTR_ERR(dfid);
763 
764         oldfid = v9fs_fid_lookup(old_dentry);
765         if (IS_ERR(oldfid))
766                 return PTR_ERR(oldfid);
767 
768         name = (char *) dentry->d_name.name;
769 
770         err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
771 
772         if (err < 0) {
773                 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
774                 return err;
775         }
776 
777         v9fs_invalidate_inode_attr(dir);
778         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
779                 /* Get the latest stat info from server. */
780                 struct p9_fid *fid;
781                 fid = v9fs_fid_lookup(old_dentry);
782                 if (IS_ERR(fid))
783                         return PTR_ERR(fid);
784 
785                 v9fs_refresh_inode_dotl(fid, old_dentry->d_inode);
786         }
787         ihold(old_dentry->d_inode);
788         d_instantiate(dentry, old_dentry->d_inode);
789 
790         return err;
791 }
792 
793 /**
794  * v9fs_vfs_mknod_dotl - create a special file
795  * @dir: inode destination for new link
796  * @dentry: dentry for file
797  * @mode: mode for creation
798  * @rdev: device associated with special file
799  *
800  */
801 static int
802 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
803                 dev_t rdev)
804 {
805         int err;
806         gid_t gid;
807         char *name;
808         umode_t mode;
809         struct v9fs_session_info *v9ses;
810         struct p9_fid *fid = NULL, *dfid = NULL;
811         struct inode *inode;
812         struct p9_qid qid;
813         struct dentry *dir_dentry;
814         struct posix_acl *dacl = NULL, *pacl = NULL;
815 
816         P9_DPRINTK(P9_DEBUG_VFS,
817                 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
818                 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
819 
820         if (!new_valid_dev(rdev))
821                 return -EINVAL;
822 
823         v9ses = v9fs_inode2v9ses(dir);
824         dir_dentry = v9fs_dentry_from_dir_inode(dir);
825         dfid = v9fs_fid_lookup(dir_dentry);
826         if (IS_ERR(dfid)) {
827                 err = PTR_ERR(dfid);
828                 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
829                 dfid = NULL;
830                 goto error;
831         }
832 
833         gid = v9fs_get_fsgid_for_create(dir);
834         mode = omode;
835         /* Update mode based on ACL value */
836         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
837         if (err) {
838                 P9_DPRINTK(P9_DEBUG_VFS,
839                            "Failed to get acl values in mknod %d\n", err);
840                 goto error;
841         }
842         name = (char *) dentry->d_name.name;
843 
844         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
845         if (err < 0)
846                 goto error;
847 
848         v9fs_invalidate_inode_attr(dir);
849         /* instantiate inode and assign the unopened fid to the dentry */
850         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
851                 fid = p9_client_walk(dfid, 1, &name, 1);
852                 if (IS_ERR(fid)) {
853                         err = PTR_ERR(fid);
854                         P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
855                                 err);
856                         fid = NULL;
857                         goto error;
858                 }
859 
860                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
861                 if (IS_ERR(inode)) {
862                         err = PTR_ERR(inode);
863                         P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
864                                 err);
865                         goto error;
866                 }
867                 err = v9fs_fid_add(dentry, fid);
868                 if (err < 0)
869                         goto error;
870                 d_instantiate(dentry, inode);
871                 fid = NULL;
872         } else {
873                 /*
874                  * Not in cached mode. No need to populate inode with stat.
875                  * socket syscall returns a fd, so we need instantiate
876                  */
877                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
878                 if (IS_ERR(inode)) {
879                         err = PTR_ERR(inode);
880                         goto error;
881                 }
882                 d_instantiate(dentry, inode);
883         }
884         /* Now set the ACL based on the default value */
885         v9fs_set_create_acl(dentry, &dacl, &pacl);
886 error:
887         if (fid)
888                 p9_client_clunk(fid);
889         v9fs_set_create_acl(NULL, &dacl, &pacl);
890         return err;
891 }
892 
893 /**
894  * v9fs_vfs_follow_link_dotl - follow a symlink path
895  * @dentry: dentry for symlink
896  * @nd: nameidata
897  *
898  */
899 
900 static void *
901 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
902 {
903         int retval;
904         struct p9_fid *fid;
905         char *link = __getname();
906         char *target;
907 
908         P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
909 
910         if (!link) {
911                 link = ERR_PTR(-ENOMEM);
912                 goto ndset;
913         }
914         fid = v9fs_fid_lookup(dentry);
915         if (IS_ERR(fid)) {
916                 __putname(link);
917                 link = ERR_CAST(fid);
918                 goto ndset;
919         }
920         retval = p9_client_readlink(fid, &target);
921         if (!retval) {
922                 strcpy(link, target);
923                 kfree(target);
924                 goto ndset;
925         }
926         __putname(link);
927         link = ERR_PTR(retval);
928 ndset:
929         nd_set_link(nd, link);
930         return NULL;
931 }
932 
933 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
934 {
935         loff_t i_size;
936         struct p9_stat_dotl *st;
937         struct v9fs_session_info *v9ses;
938 
939         v9ses = v9fs_inode2v9ses(inode);
940         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
941         if (IS_ERR(st))
942                 return PTR_ERR(st);
943         /*
944          * Don't update inode if the file type is different
945          */
946         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
947                 goto out;
948 
949         spin_lock(&inode->i_lock);
950         /*
951          * We don't want to refresh inode->i_size,
952          * because we may have cached data
953          */
954         i_size = inode->i_size;
955         v9fs_stat2inode_dotl(st, inode);
956         if (v9ses->cache)
957                 inode->i_size = i_size;
958         spin_unlock(&inode->i_lock);
959 out:
960         kfree(st);
961         return 0;
962 }
963 
964 const struct inode_operations v9fs_dir_inode_operations_dotl = {
965         .create = v9fs_vfs_create_dotl,
966         .lookup = v9fs_vfs_lookup,
967         .link = v9fs_vfs_link_dotl,
968         .symlink = v9fs_vfs_symlink_dotl,
969         .unlink = v9fs_vfs_unlink,
970         .mkdir = v9fs_vfs_mkdir_dotl,
971         .rmdir = v9fs_vfs_rmdir,
972         .mknod = v9fs_vfs_mknod_dotl,
973         .rename = v9fs_vfs_rename,
974         .getattr = v9fs_vfs_getattr_dotl,
975         .setattr = v9fs_vfs_setattr_dotl,
976         .setxattr = generic_setxattr,
977         .getxattr = generic_getxattr,
978         .removexattr = generic_removexattr,
979         .listxattr = v9fs_listxattr,
980         .get_acl = v9fs_iop_get_acl,
981 };
982 
983 const struct inode_operations v9fs_file_inode_operations_dotl = {
984         .getattr = v9fs_vfs_getattr_dotl,
985         .setattr = v9fs_vfs_setattr_dotl,
986         .setxattr = generic_setxattr,
987         .getxattr = generic_getxattr,
988         .removexattr = generic_removexattr,
989         .listxattr = v9fs_listxattr,
990         .get_acl = v9fs_iop_get_acl,
991 };
992 
993 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
994         .readlink = generic_readlink,
995         .follow_link = v9fs_vfs_follow_link_dotl,
996         .put_link = v9fs_vfs_put_link,
997         .getattr = v9fs_vfs_getattr_dotl,
998         .setattr = v9fs_vfs_setattr_dotl,
999         .setxattr = generic_setxattr,
1000         .getxattr = generic_getxattr,
1001         .removexattr = generic_removexattr,
1002         .listxattr = v9fs_listxattr,
1003 };
1004 

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