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Linux/fs/9p/vfs_inode_dotl.c

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  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  *  linux/fs/9p/vfs_inode_dotl.c
  4  *
  5  * This file contains vfs inode ops for the 9P2000.L protocol.
  6  *
  7  *  Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
  8  *  Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
  9  */
 10 
 11 #include <linux/module.h>
 12 #include <linux/errno.h>
 13 #include <linux/fs.h>
 14 #include <linux/file.h>
 15 #include <linux/pagemap.h>
 16 #include <linux/stat.h>
 17 #include <linux/string.h>
 18 #include <linux/inet.h>
 19 #include <linux/namei.h>
 20 #include <linux/idr.h>
 21 #include <linux/sched.h>
 22 #include <linux/slab.h>
 23 #include <linux/xattr.h>
 24 #include <linux/posix_acl.h>
 25 #include <net/9p/9p.h>
 26 #include <net/9p/client.h>
 27 
 28 #include "v9fs.h"
 29 #include "v9fs_vfs.h"
 30 #include "fid.h"
 31 #include "cache.h"
 32 #include "xattr.h"
 33 #include "acl.h"
 34 
 35 static int
 36 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
 37                     dev_t rdev);
 38 
 39 /**
 40  * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
 41  * new file system object. This checks the S_ISGID to determine the owning
 42  * group of the new file system object.
 43  */
 44 
 45 static kgid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
 46 {
 47         BUG_ON(dir_inode == NULL);
 48 
 49         if (dir_inode->i_mode & S_ISGID) {
 50                 /* set_gid bit is set.*/
 51                 return dir_inode->i_gid;
 52         }
 53         return current_fsgid();
 54 }
 55 
 56 static int v9fs_test_inode_dotl(struct inode *inode, void *data)
 57 {
 58         struct v9fs_inode *v9inode = V9FS_I(inode);
 59         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
 60 
 61         /* don't match inode of different type */
 62         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
 63                 return 0;
 64 
 65         if (inode->i_generation != st->st_gen)
 66                 return 0;
 67 
 68         /* compare qid details */
 69         if (memcmp(&v9inode->qid.version,
 70                    &st->qid.version, sizeof(v9inode->qid.version)))
 71                 return 0;
 72 
 73         if (v9inode->qid.type != st->qid.type)
 74                 return 0;
 75 
 76         if (v9inode->qid.path != st->qid.path)
 77                 return 0;
 78         return 1;
 79 }
 80 
 81 /* Always get a new inode */
 82 static int v9fs_test_new_inode_dotl(struct inode *inode, void *data)
 83 {
 84         return 0;
 85 }
 86 
 87 static int v9fs_set_inode_dotl(struct inode *inode,  void *data)
 88 {
 89         struct v9fs_inode *v9inode = V9FS_I(inode);
 90         struct p9_stat_dotl *st = (struct p9_stat_dotl *)data;
 91 
 92         memcpy(&v9inode->qid, &st->qid, sizeof(st->qid));
 93         inode->i_generation = st->st_gen;
 94         return 0;
 95 }
 96 
 97 static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
 98                                         struct p9_qid *qid,
 99                                         struct p9_fid *fid,
100                                         struct p9_stat_dotl *st,
101                                         int new)
102 {
103         int retval;
104         unsigned long i_ino;
105         struct inode *inode;
106         struct v9fs_session_info *v9ses = sb->s_fs_info;
107         int (*test)(struct inode *, void *);
108 
109         if (new)
110                 test = v9fs_test_new_inode_dotl;
111         else
112                 test = v9fs_test_inode_dotl;
113 
114         i_ino = v9fs_qid2ino(qid);
115         inode = iget5_locked(sb, i_ino, test, v9fs_set_inode_dotl, st);
116         if (!inode)
117                 return ERR_PTR(-ENOMEM);
118         if (!(inode->i_state & I_NEW))
119                 return inode;
120         /*
121          * initialize the inode with the stat info
122          * FIXME!! we may need support for stale inodes
123          * later.
124          */
125         inode->i_ino = i_ino;
126         retval = v9fs_init_inode(v9ses, inode,
127                                  st->st_mode, new_decode_dev(st->st_rdev));
128         if (retval)
129                 goto error;
130 
131         v9fs_stat2inode_dotl(st, inode, 0);
132         v9fs_cache_inode_get_cookie(inode);
133         retval = v9fs_get_acl(inode, fid);
134         if (retval)
135                 goto error;
136 
137         unlock_new_inode(inode);
138         return inode;
139 error:
140         iget_failed(inode);
141         return ERR_PTR(retval);
142 
143 }
144 
145 struct inode *
146 v9fs_inode_from_fid_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
147                          struct super_block *sb, int new)
148 {
149         struct p9_stat_dotl *st;
150         struct inode *inode = NULL;
151 
152         st = p9_client_getattr_dotl(fid, P9_STATS_BASIC | P9_STATS_GEN);
153         if (IS_ERR(st))
154                 return ERR_CAST(st);
155 
156         inode = v9fs_qid_iget_dotl(sb, &st->qid, fid, st, new);
157         kfree(st);
158         return inode;
159 }
160 
161 struct dotl_openflag_map {
162         int open_flag;
163         int dotl_flag;
164 };
165 
166 static int v9fs_mapped_dotl_flags(int flags)
167 {
168         int i;
169         int rflags = 0;
170         struct dotl_openflag_map dotl_oflag_map[] = {
171                 { O_CREAT,      P9_DOTL_CREATE },
172                 { O_EXCL,       P9_DOTL_EXCL },
173                 { O_NOCTTY,     P9_DOTL_NOCTTY },
174                 { O_APPEND,     P9_DOTL_APPEND },
175                 { O_NONBLOCK,   P9_DOTL_NONBLOCK },
176                 { O_DSYNC,      P9_DOTL_DSYNC },
177                 { FASYNC,       P9_DOTL_FASYNC },
178                 { O_DIRECT,     P9_DOTL_DIRECT },
179                 { O_LARGEFILE,  P9_DOTL_LARGEFILE },
180                 { O_DIRECTORY,  P9_DOTL_DIRECTORY },
181                 { O_NOFOLLOW,   P9_DOTL_NOFOLLOW },
182                 { O_NOATIME,    P9_DOTL_NOATIME },
183                 { O_CLOEXEC,    P9_DOTL_CLOEXEC },
184                 { O_SYNC,       P9_DOTL_SYNC},
185         };
186         for (i = 0; i < ARRAY_SIZE(dotl_oflag_map); i++) {
187                 if (flags & dotl_oflag_map[i].open_flag)
188                         rflags |= dotl_oflag_map[i].dotl_flag;
189         }
190         return rflags;
191 }
192 
193 /**
194  * v9fs_open_to_dotl_flags- convert Linux specific open flags to
195  * plan 9 open flag.
196  * @flags: flags to convert
197  */
198 int v9fs_open_to_dotl_flags(int flags)
199 {
200         int rflags = 0;
201 
202         /*
203          * We have same bits for P9_DOTL_READONLY, P9_DOTL_WRONLY
204          * and P9_DOTL_NOACCESS
205          */
206         rflags |= flags & O_ACCMODE;
207         rflags |= v9fs_mapped_dotl_flags(flags);
208 
209         return rflags;
210 }
211 
212 /**
213  * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
214  * @dir: directory inode that is being created
215  * @dentry:  dentry that is being deleted
216  * @omode: create permissions
217  *
218  */
219 
220 static int
221 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, umode_t omode,
222                 bool excl)
223 {
224         return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
225 }
226 
227 static int
228 v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
229                           struct file *file, unsigned flags, umode_t omode)
230 {
231         int err = 0;
232         kgid_t gid;
233         umode_t mode;
234         const unsigned char *name = NULL;
235         struct p9_qid qid;
236         struct inode *inode;
237         struct p9_fid *fid = NULL;
238         struct v9fs_inode *v9inode;
239         struct p9_fid *dfid, *ofid, *inode_fid;
240         struct v9fs_session_info *v9ses;
241         struct posix_acl *pacl = NULL, *dacl = NULL;
242         struct dentry *res = NULL;
243 
244         if (d_in_lookup(dentry)) {
245                 res = v9fs_vfs_lookup(dir, dentry, 0);
246                 if (IS_ERR(res))
247                         return PTR_ERR(res);
248 
249                 if (res)
250                         dentry = res;
251         }
252 
253         /* Only creates */
254         if (!(flags & O_CREAT) || d_really_is_positive(dentry))
255                 return  finish_no_open(file, res);
256 
257         v9ses = v9fs_inode2v9ses(dir);
258 
259         name = dentry->d_name.name;
260         p9_debug(P9_DEBUG_VFS, "name:%s flags:0x%x mode:0x%hx\n",
261                  name, flags, omode);
262 
263         dfid = v9fs_parent_fid(dentry);
264         if (IS_ERR(dfid)) {
265                 err = PTR_ERR(dfid);
266                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
267                 goto out;
268         }
269 
270         /* clone a fid to use for creation */
271         ofid = clone_fid(dfid);
272         if (IS_ERR(ofid)) {
273                 err = PTR_ERR(ofid);
274                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
275                 goto out;
276         }
277 
278         gid = v9fs_get_fsgid_for_create(dir);
279 
280         mode = omode;
281         /* Update mode based on ACL value */
282         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
283         if (err) {
284                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in creat %d\n",
285                          err);
286                 goto error;
287         }
288         err = p9_client_create_dotl(ofid, name, v9fs_open_to_dotl_flags(flags),
289                                     mode, gid, &qid);
290         if (err < 0) {
291                 p9_debug(P9_DEBUG_VFS, "p9_client_open_dotl failed in creat %d\n",
292                          err);
293                 goto error;
294         }
295         v9fs_invalidate_inode_attr(dir);
296 
297         /* instantiate inode and assign the unopened fid to the dentry */
298         fid = p9_client_walk(dfid, 1, &name, 1);
299         if (IS_ERR(fid)) {
300                 err = PTR_ERR(fid);
301                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
302                 fid = NULL;
303                 goto error;
304         }
305         inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
306         if (IS_ERR(inode)) {
307                 err = PTR_ERR(inode);
308                 p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n", err);
309                 goto error;
310         }
311         /* Now set the ACL based on the default value */
312         v9fs_set_create_acl(inode, fid, dacl, pacl);
313 
314         v9fs_fid_add(dentry, fid);
315         d_instantiate(dentry, inode);
316 
317         v9inode = V9FS_I(inode);
318         mutex_lock(&v9inode->v_mutex);
319         if ((v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) &&
320             !v9inode->writeback_fid &&
321             ((flags & O_ACCMODE) != O_RDONLY)) {
322                 /*
323                  * clone a fid and add it to writeback_fid
324                  * we do it during open time instead of
325                  * page dirty time via write_begin/page_mkwrite
326                  * because we want write after unlink usecase
327                  * to work.
328                  */
329                 inode_fid = v9fs_writeback_fid(dentry);
330                 if (IS_ERR(inode_fid)) {
331                         err = PTR_ERR(inode_fid);
332                         mutex_unlock(&v9inode->v_mutex);
333                         goto err_clunk_old_fid;
334                 }
335                 v9inode->writeback_fid = (void *) inode_fid;
336         }
337         mutex_unlock(&v9inode->v_mutex);
338         /* Since we are opening a file, assign the open fid to the file */
339         err = finish_open(file, dentry, generic_file_open);
340         if (err)
341                 goto err_clunk_old_fid;
342         file->private_data = ofid;
343         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
344                 v9fs_cache_inode_set_cookie(inode, file);
345         file->f_mode |= FMODE_CREATED;
346 out:
347         v9fs_put_acl(dacl, pacl);
348         dput(res);
349         return err;
350 
351 error:
352         if (fid)
353                 p9_client_clunk(fid);
354 err_clunk_old_fid:
355         if (ofid)
356                 p9_client_clunk(ofid);
357         goto out;
358 }
359 
360 /**
361  * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
362  * @dir:  inode that is being unlinked
363  * @dentry: dentry that is being unlinked
364  * @omode: mode for new directory
365  *
366  */
367 
368 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
369                                struct dentry *dentry, umode_t omode)
370 {
371         int err;
372         struct v9fs_session_info *v9ses;
373         struct p9_fid *fid = NULL, *dfid = NULL;
374         kgid_t gid;
375         const unsigned char *name;
376         umode_t mode;
377         struct inode *inode;
378         struct p9_qid qid;
379         struct posix_acl *dacl = NULL, *pacl = NULL;
380 
381         p9_debug(P9_DEBUG_VFS, "name %pd\n", dentry);
382         err = 0;
383         v9ses = v9fs_inode2v9ses(dir);
384 
385         omode |= S_IFDIR;
386         if (dir->i_mode & S_ISGID)
387                 omode |= S_ISGID;
388 
389         dfid = v9fs_parent_fid(dentry);
390         if (IS_ERR(dfid)) {
391                 err = PTR_ERR(dfid);
392                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
393                 dfid = NULL;
394                 goto error;
395         }
396 
397         gid = v9fs_get_fsgid_for_create(dir);
398         mode = omode;
399         /* Update mode based on ACL value */
400         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
401         if (err) {
402                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mkdir %d\n",
403                          err);
404                 goto error;
405         }
406         name = dentry->d_name.name;
407         err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
408         if (err < 0)
409                 goto error;
410 
411         fid = p9_client_walk(dfid, 1, &name, 1);
412         if (IS_ERR(fid)) {
413                 err = PTR_ERR(fid);
414                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
415                          err);
416                 fid = NULL;
417                 goto error;
418         }
419 
420         /* instantiate inode and assign the unopened fid to the dentry */
421         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
422                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
423                 if (IS_ERR(inode)) {
424                         err = PTR_ERR(inode);
425                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
426                                  err);
427                         goto error;
428                 }
429                 v9fs_fid_add(dentry, fid);
430                 v9fs_set_create_acl(inode, fid, dacl, pacl);
431                 d_instantiate(dentry, inode);
432                 fid = NULL;
433                 err = 0;
434         } else {
435                 /*
436                  * Not in cached mode. No need to populate
437                  * inode with stat. We need to get an inode
438                  * so that we can set the acl with dentry
439                  */
440                 inode = v9fs_get_inode(dir->i_sb, mode, 0);
441                 if (IS_ERR(inode)) {
442                         err = PTR_ERR(inode);
443                         goto error;
444                 }
445                 v9fs_set_create_acl(inode, fid, dacl, pacl);
446                 d_instantiate(dentry, inode);
447         }
448         inc_nlink(dir);
449         v9fs_invalidate_inode_attr(dir);
450 error:
451         if (fid)
452                 p9_client_clunk(fid);
453         v9fs_put_acl(dacl, pacl);
454         return err;
455 }
456 
457 static int
458 v9fs_vfs_getattr_dotl(const struct path *path, struct kstat *stat,
459                  u32 request_mask, unsigned int flags)
460 {
461         struct dentry *dentry = path->dentry;
462         struct v9fs_session_info *v9ses;
463         struct p9_fid *fid;
464         struct p9_stat_dotl *st;
465 
466         p9_debug(P9_DEBUG_VFS, "dentry: %p\n", dentry);
467         v9ses = v9fs_dentry2v9ses(dentry);
468         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
469                 generic_fillattr(d_inode(dentry), stat);
470                 return 0;
471         }
472         fid = v9fs_fid_lookup(dentry);
473         if (IS_ERR(fid))
474                 return PTR_ERR(fid);
475 
476         /* Ask for all the fields in stat structure. Server will return
477          * whatever it supports
478          */
479 
480         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
481         if (IS_ERR(st))
482                 return PTR_ERR(st);
483 
484         v9fs_stat2inode_dotl(st, d_inode(dentry), 0);
485         generic_fillattr(d_inode(dentry), stat);
486         /* Change block size to what the server returned */
487         stat->blksize = st->st_blksize;
488 
489         kfree(st);
490         return 0;
491 }
492 
493 /*
494  * Attribute flags.
495  */
496 #define P9_ATTR_MODE            (1 << 0)
497 #define P9_ATTR_UID             (1 << 1)
498 #define P9_ATTR_GID             (1 << 2)
499 #define P9_ATTR_SIZE            (1 << 3)
500 #define P9_ATTR_ATIME           (1 << 4)
501 #define P9_ATTR_MTIME           (1 << 5)
502 #define P9_ATTR_CTIME           (1 << 6)
503 #define P9_ATTR_ATIME_SET       (1 << 7)
504 #define P9_ATTR_MTIME_SET       (1 << 8)
505 
506 struct dotl_iattr_map {
507         int iattr_valid;
508         int p9_iattr_valid;
509 };
510 
511 static int v9fs_mapped_iattr_valid(int iattr_valid)
512 {
513         int i;
514         int p9_iattr_valid = 0;
515         struct dotl_iattr_map dotl_iattr_map[] = {
516                 { ATTR_MODE,            P9_ATTR_MODE },
517                 { ATTR_UID,             P9_ATTR_UID },
518                 { ATTR_GID,             P9_ATTR_GID },
519                 { ATTR_SIZE,            P9_ATTR_SIZE },
520                 { ATTR_ATIME,           P9_ATTR_ATIME },
521                 { ATTR_MTIME,           P9_ATTR_MTIME },
522                 { ATTR_CTIME,           P9_ATTR_CTIME },
523                 { ATTR_ATIME_SET,       P9_ATTR_ATIME_SET },
524                 { ATTR_MTIME_SET,       P9_ATTR_MTIME_SET },
525         };
526         for (i = 0; i < ARRAY_SIZE(dotl_iattr_map); i++) {
527                 if (iattr_valid & dotl_iattr_map[i].iattr_valid)
528                         p9_iattr_valid |= dotl_iattr_map[i].p9_iattr_valid;
529         }
530         return p9_iattr_valid;
531 }
532 
533 /**
534  * v9fs_vfs_setattr_dotl - set file metadata
535  * @dentry: file whose metadata to set
536  * @iattr: metadata assignment structure
537  *
538  */
539 
540 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
541 {
542         int retval;
543         struct p9_fid *fid;
544         struct p9_iattr_dotl p9attr;
545         struct inode *inode = d_inode(dentry);
546 
547         p9_debug(P9_DEBUG_VFS, "\n");
548 
549         retval = setattr_prepare(dentry, iattr);
550         if (retval)
551                 return retval;
552 
553         p9attr.valid = v9fs_mapped_iattr_valid(iattr->ia_valid);
554         p9attr.mode = iattr->ia_mode;
555         p9attr.uid = iattr->ia_uid;
556         p9attr.gid = iattr->ia_gid;
557         p9attr.size = iattr->ia_size;
558         p9attr.atime_sec = iattr->ia_atime.tv_sec;
559         p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
560         p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
561         p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
562 
563         fid = v9fs_fid_lookup(dentry);
564         if (IS_ERR(fid))
565                 return PTR_ERR(fid);
566 
567         /* Write all dirty data */
568         if (S_ISREG(inode->i_mode))
569                 filemap_write_and_wait(inode->i_mapping);
570 
571         retval = p9_client_setattr(fid, &p9attr);
572         if (retval < 0)
573                 return retval;
574 
575         if ((iattr->ia_valid & ATTR_SIZE) &&
576             iattr->ia_size != i_size_read(inode))
577                 truncate_setsize(inode, iattr->ia_size);
578 
579         v9fs_invalidate_inode_attr(inode);
580         setattr_copy(inode, iattr);
581         mark_inode_dirty(inode);
582         if (iattr->ia_valid & ATTR_MODE) {
583                 /* We also want to update ACL when we update mode bits */
584                 retval = v9fs_acl_chmod(inode, fid);
585                 if (retval < 0)
586                         return retval;
587         }
588         return 0;
589 }
590 
591 /**
592  * v9fs_stat2inode_dotl - populate an inode structure with stat info
593  * @stat: stat structure
594  * @inode: inode to populate
595  * @flags: ctrl flags (e.g. V9FS_STAT2INODE_KEEP_ISIZE)
596  *
597  */
598 
599 void
600 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode,
601                       unsigned int flags)
602 {
603         umode_t mode;
604         struct v9fs_inode *v9inode = V9FS_I(inode);
605 
606         if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
607                 inode->i_atime.tv_sec = stat->st_atime_sec;
608                 inode->i_atime.tv_nsec = stat->st_atime_nsec;
609                 inode->i_mtime.tv_sec = stat->st_mtime_sec;
610                 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
611                 inode->i_ctime.tv_sec = stat->st_ctime_sec;
612                 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
613                 inode->i_uid = stat->st_uid;
614                 inode->i_gid = stat->st_gid;
615                 set_nlink(inode, stat->st_nlink);
616 
617                 mode = stat->st_mode & S_IALLUGO;
618                 mode |= inode->i_mode & ~S_IALLUGO;
619                 inode->i_mode = mode;
620 
621                 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE))
622                         v9fs_i_size_write(inode, stat->st_size);
623                 inode->i_blocks = stat->st_blocks;
624         } else {
625                 if (stat->st_result_mask & P9_STATS_ATIME) {
626                         inode->i_atime.tv_sec = stat->st_atime_sec;
627                         inode->i_atime.tv_nsec = stat->st_atime_nsec;
628                 }
629                 if (stat->st_result_mask & P9_STATS_MTIME) {
630                         inode->i_mtime.tv_sec = stat->st_mtime_sec;
631                         inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
632                 }
633                 if (stat->st_result_mask & P9_STATS_CTIME) {
634                         inode->i_ctime.tv_sec = stat->st_ctime_sec;
635                         inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
636                 }
637                 if (stat->st_result_mask & P9_STATS_UID)
638                         inode->i_uid = stat->st_uid;
639                 if (stat->st_result_mask & P9_STATS_GID)
640                         inode->i_gid = stat->st_gid;
641                 if (stat->st_result_mask & P9_STATS_NLINK)
642                         set_nlink(inode, stat->st_nlink);
643                 if (stat->st_result_mask & P9_STATS_MODE) {
644                         inode->i_mode = stat->st_mode;
645                         if ((S_ISBLK(inode->i_mode)) ||
646                                                 (S_ISCHR(inode->i_mode)))
647                                 init_special_inode(inode, inode->i_mode,
648                                                                 inode->i_rdev);
649                 }
650                 if (stat->st_result_mask & P9_STATS_RDEV)
651                         inode->i_rdev = new_decode_dev(stat->st_rdev);
652                 if (!(flags & V9FS_STAT2INODE_KEEP_ISIZE) &&
653                     stat->st_result_mask & P9_STATS_SIZE)
654                         v9fs_i_size_write(inode, stat->st_size);
655                 if (stat->st_result_mask & P9_STATS_BLOCKS)
656                         inode->i_blocks = stat->st_blocks;
657         }
658         if (stat->st_result_mask & P9_STATS_GEN)
659                 inode->i_generation = stat->st_gen;
660 
661         /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
662          * because the inode structure does not have fields for them.
663          */
664         v9inode->cache_validity &= ~V9FS_INO_INVALID_ATTR;
665 }
666 
667 static int
668 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
669                 const char *symname)
670 {
671         int err;
672         kgid_t gid;
673         const unsigned char *name;
674         struct p9_qid qid;
675         struct inode *inode;
676         struct p9_fid *dfid;
677         struct p9_fid *fid = NULL;
678         struct v9fs_session_info *v9ses;
679 
680         name = dentry->d_name.name;
681         p9_debug(P9_DEBUG_VFS, "%lu,%s,%s\n", dir->i_ino, name, symname);
682         v9ses = v9fs_inode2v9ses(dir);
683 
684         dfid = v9fs_parent_fid(dentry);
685         if (IS_ERR(dfid)) {
686                 err = PTR_ERR(dfid);
687                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
688                 return err;
689         }
690 
691         gid = v9fs_get_fsgid_for_create(dir);
692 
693         /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
694         err = p9_client_symlink(dfid, name, symname, gid, &qid);
695 
696         if (err < 0) {
697                 p9_debug(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
698                 goto error;
699         }
700 
701         v9fs_invalidate_inode_attr(dir);
702         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
703                 /* Now walk from the parent so we can get an unopened fid. */
704                 fid = p9_client_walk(dfid, 1, &name, 1);
705                 if (IS_ERR(fid)) {
706                         err = PTR_ERR(fid);
707                         p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
708                                  err);
709                         fid = NULL;
710                         goto error;
711                 }
712 
713                 /* instantiate inode and assign the unopened fid to dentry */
714                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
715                 if (IS_ERR(inode)) {
716                         err = PTR_ERR(inode);
717                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
718                                  err);
719                         goto error;
720                 }
721                 v9fs_fid_add(dentry, fid);
722                 d_instantiate(dentry, inode);
723                 fid = NULL;
724                 err = 0;
725         } else {
726                 /* Not in cached mode. No need to populate inode with stat */
727                 inode = v9fs_get_inode(dir->i_sb, S_IFLNK, 0);
728                 if (IS_ERR(inode)) {
729                         err = PTR_ERR(inode);
730                         goto error;
731                 }
732                 d_instantiate(dentry, inode);
733         }
734 
735 error:
736         if (fid)
737                 p9_client_clunk(fid);
738 
739         return err;
740 }
741 
742 /**
743  * v9fs_vfs_link_dotl - create a hardlink for dotl
744  * @old_dentry: dentry for file to link to
745  * @dir: inode destination for new link
746  * @dentry: dentry for link
747  *
748  */
749 
750 static int
751 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
752                 struct dentry *dentry)
753 {
754         int err;
755         struct p9_fid *dfid, *oldfid;
756         struct v9fs_session_info *v9ses;
757 
758         p9_debug(P9_DEBUG_VFS, "dir ino: %lu, old_name: %pd, new_name: %pd\n",
759                  dir->i_ino, old_dentry, dentry);
760 
761         v9ses = v9fs_inode2v9ses(dir);
762         dfid = v9fs_parent_fid(dentry);
763         if (IS_ERR(dfid))
764                 return PTR_ERR(dfid);
765 
766         oldfid = v9fs_fid_lookup(old_dentry);
767         if (IS_ERR(oldfid))
768                 return PTR_ERR(oldfid);
769 
770         err = p9_client_link(dfid, oldfid, dentry->d_name.name);
771 
772         if (err < 0) {
773                 p9_debug(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, d_inode(old_dentry));
786         }
787         ihold(d_inode(old_dentry));
788         d_instantiate(dentry, d_inode(old_dentry));
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  * @omode: 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, umode_t omode,
803                 dev_t rdev)
804 {
805         int err;
806         kgid_t gid;
807         const unsigned 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 posix_acl *dacl = NULL, *pacl = NULL;
814 
815         p9_debug(P9_DEBUG_VFS, " %lu,%pd mode: %hx MAJOR: %u MINOR: %u\n",
816                  dir->i_ino, dentry, omode,
817                  MAJOR(rdev), MINOR(rdev));
818 
819         v9ses = v9fs_inode2v9ses(dir);
820         dfid = v9fs_parent_fid(dentry);
821         if (IS_ERR(dfid)) {
822                 err = PTR_ERR(dfid);
823                 p9_debug(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
824                 dfid = NULL;
825                 goto error;
826         }
827 
828         gid = v9fs_get_fsgid_for_create(dir);
829         mode = omode;
830         /* Update mode based on ACL value */
831         err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
832         if (err) {
833                 p9_debug(P9_DEBUG_VFS, "Failed to get acl values in mknod %d\n",
834                          err);
835                 goto error;
836         }
837         name = dentry->d_name.name;
838 
839         err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
840         if (err < 0)
841                 goto error;
842 
843         v9fs_invalidate_inode_attr(dir);
844         fid = p9_client_walk(dfid, 1, &name, 1);
845         if (IS_ERR(fid)) {
846                 err = PTR_ERR(fid);
847                 p9_debug(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
848                          err);
849                 fid = NULL;
850                 goto error;
851         }
852 
853         /* instantiate inode and assign the unopened fid to the dentry */
854         if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
855                 inode = v9fs_get_new_inode_from_fid(v9ses, fid, dir->i_sb);
856                 if (IS_ERR(inode)) {
857                         err = PTR_ERR(inode);
858                         p9_debug(P9_DEBUG_VFS, "inode creation failed %d\n",
859                                  err);
860                         goto error;
861                 }
862                 v9fs_set_create_acl(inode, fid, dacl, pacl);
863                 v9fs_fid_add(dentry, fid);
864                 d_instantiate(dentry, inode);
865                 fid = NULL;
866                 err = 0;
867         } else {
868                 /*
869                  * Not in cached mode. No need to populate inode with stat.
870                  * socket syscall returns a fd, so we need instantiate
871                  */
872                 inode = v9fs_get_inode(dir->i_sb, mode, rdev);
873                 if (IS_ERR(inode)) {
874                         err = PTR_ERR(inode);
875                         goto error;
876                 }
877                 v9fs_set_create_acl(inode, fid, dacl, pacl);
878                 d_instantiate(dentry, inode);
879         }
880 error:
881         if (fid)
882                 p9_client_clunk(fid);
883         v9fs_put_acl(dacl, pacl);
884         return err;
885 }
886 
887 /**
888  * v9fs_vfs_get_link_dotl - follow a symlink path
889  * @dentry: dentry for symlink
890  * @inode: inode for symlink
891  * @done: destructor for return value
892  */
893 
894 static const char *
895 v9fs_vfs_get_link_dotl(struct dentry *dentry,
896                        struct inode *inode,
897                        struct delayed_call *done)
898 {
899         struct p9_fid *fid;
900         char *target;
901         int retval;
902 
903         if (!dentry)
904                 return ERR_PTR(-ECHILD);
905 
906         p9_debug(P9_DEBUG_VFS, "%pd\n", dentry);
907 
908         fid = v9fs_fid_lookup(dentry);
909         if (IS_ERR(fid))
910                 return ERR_CAST(fid);
911         retval = p9_client_readlink(fid, &target);
912         if (retval)
913                 return ERR_PTR(retval);
914         set_delayed_call(done, kfree_link, target);
915         return target;
916 }
917 
918 int v9fs_refresh_inode_dotl(struct p9_fid *fid, struct inode *inode)
919 {
920         struct p9_stat_dotl *st;
921         struct v9fs_session_info *v9ses;
922         unsigned int flags;
923 
924         v9ses = v9fs_inode2v9ses(inode);
925         st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
926         if (IS_ERR(st))
927                 return PTR_ERR(st);
928         /*
929          * Don't update inode if the file type is different
930          */
931         if ((inode->i_mode & S_IFMT) != (st->st_mode & S_IFMT))
932                 goto out;
933 
934         /*
935          * We don't want to refresh inode->i_size,
936          * because we may have cached data
937          */
938         flags = (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) ?
939                 V9FS_STAT2INODE_KEEP_ISIZE : 0;
940         v9fs_stat2inode_dotl(st, inode, flags);
941 out:
942         kfree(st);
943         return 0;
944 }
945 
946 const struct inode_operations v9fs_dir_inode_operations_dotl = {
947         .create = v9fs_vfs_create_dotl,
948         .atomic_open = v9fs_vfs_atomic_open_dotl,
949         .lookup = v9fs_vfs_lookup,
950         .link = v9fs_vfs_link_dotl,
951         .symlink = v9fs_vfs_symlink_dotl,
952         .unlink = v9fs_vfs_unlink,
953         .mkdir = v9fs_vfs_mkdir_dotl,
954         .rmdir = v9fs_vfs_rmdir,
955         .mknod = v9fs_vfs_mknod_dotl,
956         .rename = v9fs_vfs_rename,
957         .getattr = v9fs_vfs_getattr_dotl,
958         .setattr = v9fs_vfs_setattr_dotl,
959         .listxattr = v9fs_listxattr,
960         .get_acl = v9fs_iop_get_acl,
961 };
962 
963 const struct inode_operations v9fs_file_inode_operations_dotl = {
964         .getattr = v9fs_vfs_getattr_dotl,
965         .setattr = v9fs_vfs_setattr_dotl,
966         .listxattr = v9fs_listxattr,
967         .get_acl = v9fs_iop_get_acl,
968 };
969 
970 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
971         .get_link = v9fs_vfs_get_link_dotl,
972         .getattr = v9fs_vfs_getattr_dotl,
973         .setattr = v9fs_vfs_setattr_dotl,
974         .listxattr = v9fs_listxattr,
975 };
976 

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