2 * linux/fs/9p/vfs_inode_dotl.c
4 * This file contains vfs inode ops for the 9P2000.L protocol.
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.
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.
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
26 #include <linux/module.h>
27 #include <linux/errno.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>
51 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
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.
60 static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
62 BUG_ON(dir_inode == NULL);
64 if (dir_inode->i_mode & S_ISGID) {
65 /* set_gid bit is set.*/
66 return dir_inode->i_gid;
68 return current_fsgid();
72 * v9fs_dentry_from_dir_inode - helper function to get the dentry from
77 static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
79 struct dentry *dentry;
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);
90 v9fs_inode_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
91 struct super_block *sb)
93 struct inode *ret = NULL;
95 struct p9_stat_dotl *st;
97 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
101 ret = v9fs_get_inode(sb, st->st_mode);
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);
113 err = v9fs_get_acl(ret, fid);
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
135 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
136 struct nameidata *nd)
143 struct v9fs_session_info *v9ses;
144 struct p9_fid *fid = NULL;
145 struct p9_fid *dfid, *ofid;
149 struct posix_acl *pacl = NULL, *dacl = NULL;
151 v9ses = v9fs_inode2v9ses(dir);
152 if (nd && nd->flags & LOOKUP_OPEN)
153 flags = nd->intent.open.flags - 1;
156 * create call without LOOKUP_OPEN is due
157 * to mknod of regular files. So use mknod
160 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
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);
167 dfid = v9fs_fid_lookup(dentry->d_parent);
170 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
174 /* clone a fid to use for creation */
175 ofid = p9_client_walk(dfid, 0, NULL, 1);
178 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
182 gid = v9fs_get_fsgid_for_create(dir);
185 /* Update mode based on ACL value */
186 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
188 P9_DPRINTK(P9_DEBUG_VFS,
189 "Failed to get acl values in creat %d\n", err);
192 err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
194 P9_DPRINTK(P9_DEBUG_VFS,
195 "p9_client_open_dotl failed in creat %d\n",
200 /* instantiate inode and assign the unopened fid to the dentry */
201 fid = p9_client_walk(dfid, 1, &name, 1);
204 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
208 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
210 err = PTR_ERR(inode);
211 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
214 d_instantiate(dentry, inode);
215 err = v9fs_fid_add(dentry, fid);
219 /* Now set the ACL based on the default value */
220 v9fs_set_create_acl(dentry, dacl, pacl);
222 /* Since we are opening a file, assign the open fid to the file */
223 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
225 p9_client_clunk(ofid);
226 return PTR_ERR(filp);
228 filp->private_data = ofid;
233 p9_client_clunk(ofid);
235 p9_client_clunk(fid);
240 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
241 * @dir: inode that is being unlinked
242 * @dentry: dentry that is being unlinked
243 * @mode: mode for new directory
247 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
248 struct dentry *dentry, int omode)
251 struct v9fs_session_info *v9ses;
252 struct p9_fid *fid = NULL, *dfid = NULL;
258 struct dentry *dir_dentry;
259 struct posix_acl *dacl = NULL, *pacl = NULL;
261 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
263 v9ses = v9fs_inode2v9ses(dir);
266 if (dir->i_mode & S_ISGID)
269 dir_dentry = v9fs_dentry_from_dir_inode(dir);
270 dfid = v9fs_fid_lookup(dir_dentry);
273 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
278 gid = v9fs_get_fsgid_for_create(dir);
280 /* Update mode based on ACL value */
281 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
283 P9_DPRINTK(P9_DEBUG_VFS,
284 "Failed to get acl values in mkdir %d\n", err);
287 name = (char *) dentry->d_name.name;
288 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
292 /* instantiate inode and assign the unopened fid to the dentry */
293 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
294 fid = p9_client_walk(dfid, 1, &name, 1);
297 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
303 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
305 err = PTR_ERR(inode);
306 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
310 d_instantiate(dentry, inode);
311 err = v9fs_fid_add(dentry, fid);
317 * Not in cached mode. No need to populate
318 * inode with stat. We need to get an inode
319 * so that we can set the acl with dentry
321 inode = v9fs_get_inode(dir->i_sb, mode);
323 err = PTR_ERR(inode);
326 d_instantiate(dentry, inode);
328 /* Now set the ACL based on the default value */
329 v9fs_set_create_acl(dentry, dacl, pacl);
333 p9_client_clunk(fid);
338 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
342 struct v9fs_session_info *v9ses;
344 struct p9_stat_dotl *st;
346 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
348 v9ses = v9fs_inode2v9ses(dentry->d_inode);
349 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
350 return simple_getattr(mnt, dentry, stat);
352 fid = v9fs_fid_lookup(dentry);
356 /* Ask for all the fields in stat structure. Server will return
357 * whatever it supports
360 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
364 v9fs_stat2inode_dotl(st, dentry->d_inode);
365 generic_fillattr(dentry->d_inode, stat);
366 /* Change block size to what the server returned */
367 stat->blksize = st->st_blksize;
374 * v9fs_vfs_setattr_dotl - set file metadata
375 * @dentry: file whose metadata to set
376 * @iattr: metadata assignment structure
380 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
383 struct v9fs_session_info *v9ses;
385 struct p9_iattr_dotl p9attr;
387 P9_DPRINTK(P9_DEBUG_VFS, "\n");
389 retval = inode_change_ok(dentry->d_inode, iattr);
393 p9attr.valid = iattr->ia_valid;
394 p9attr.mode = iattr->ia_mode;
395 p9attr.uid = iattr->ia_uid;
396 p9attr.gid = iattr->ia_gid;
397 p9attr.size = iattr->ia_size;
398 p9attr.atime_sec = iattr->ia_atime.tv_sec;
399 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
400 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
401 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
404 v9ses = v9fs_inode2v9ses(dentry->d_inode);
405 fid = v9fs_fid_lookup(dentry);
409 retval = p9_client_setattr(fid, &p9attr);
413 if ((iattr->ia_valid & ATTR_SIZE) &&
414 iattr->ia_size != i_size_read(dentry->d_inode)) {
415 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
420 setattr_copy(dentry->d_inode, iattr);
421 mark_inode_dirty(dentry->d_inode);
422 if (iattr->ia_valid & ATTR_MODE) {
423 /* We also want to update ACL when we update mode bits */
424 retval = v9fs_acl_chmod(dentry);
432 * v9fs_stat2inode_dotl - populate an inode structure with stat info
433 * @stat: stat structure
434 * @inode: inode to populate
435 * @sb: superblock of filesystem
440 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
443 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
444 inode->i_atime.tv_sec = stat->st_atime_sec;
445 inode->i_atime.tv_nsec = stat->st_atime_nsec;
446 inode->i_mtime.tv_sec = stat->st_mtime_sec;
447 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
448 inode->i_ctime.tv_sec = stat->st_ctime_sec;
449 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
450 inode->i_uid = stat->st_uid;
451 inode->i_gid = stat->st_gid;
452 inode->i_nlink = stat->st_nlink;
453 inode->i_mode = stat->st_mode;
454 inode->i_rdev = new_decode_dev(stat->st_rdev);
456 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
457 init_special_inode(inode, inode->i_mode, inode->i_rdev);
459 i_size_write(inode, stat->st_size);
460 inode->i_blocks = stat->st_blocks;
462 if (stat->st_result_mask & P9_STATS_ATIME) {
463 inode->i_atime.tv_sec = stat->st_atime_sec;
464 inode->i_atime.tv_nsec = stat->st_atime_nsec;
466 if (stat->st_result_mask & P9_STATS_MTIME) {
467 inode->i_mtime.tv_sec = stat->st_mtime_sec;
468 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
470 if (stat->st_result_mask & P9_STATS_CTIME) {
471 inode->i_ctime.tv_sec = stat->st_ctime_sec;
472 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
474 if (stat->st_result_mask & P9_STATS_UID)
475 inode->i_uid = stat->st_uid;
476 if (stat->st_result_mask & P9_STATS_GID)
477 inode->i_gid = stat->st_gid;
478 if (stat->st_result_mask & P9_STATS_NLINK)
479 inode->i_nlink = stat->st_nlink;
480 if (stat->st_result_mask & P9_STATS_MODE) {
481 inode->i_mode = stat->st_mode;
482 if ((S_ISBLK(inode->i_mode)) ||
483 (S_ISCHR(inode->i_mode)))
484 init_special_inode(inode, inode->i_mode,
487 if (stat->st_result_mask & P9_STATS_RDEV)
488 inode->i_rdev = new_decode_dev(stat->st_rdev);
489 if (stat->st_result_mask & P9_STATS_SIZE)
490 i_size_write(inode, stat->st_size);
491 if (stat->st_result_mask & P9_STATS_BLOCKS)
492 inode->i_blocks = stat->st_blocks;
494 if (stat->st_result_mask & P9_STATS_GEN)
495 inode->i_generation = stat->st_gen;
497 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
498 * because the inode structure does not have fields for them.
503 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
506 struct v9fs_session_info *v9ses;
508 struct p9_fid *fid = NULL;
515 name = (char *) dentry->d_name.name;
516 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
517 dir->i_ino, name, symname);
518 v9ses = v9fs_inode2v9ses(dir);
520 dfid = v9fs_fid_lookup(dentry->d_parent);
523 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
527 gid = v9fs_get_fsgid_for_create(dir);
529 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
530 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
533 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
538 /* Now walk from the parent so we can get an unopened fid. */
539 fid = p9_client_walk(dfid, 1, &name, 1);
542 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
548 /* instantiate inode and assign the unopened fid to dentry */
549 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
551 err = PTR_ERR(inode);
552 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
556 d_instantiate(dentry, inode);
557 err = v9fs_fid_add(dentry, fid);
562 /* Not in cached mode. No need to populate inode with stat */
563 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
565 err = PTR_ERR(inode);
568 d_instantiate(dentry, inode);
573 p9_client_clunk(fid);
579 * v9fs_vfs_link_dotl - create a hardlink for dotl
580 * @old_dentry: dentry for file to link to
581 * @dir: inode destination for new link
582 * @dentry: dentry for link
587 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
588 struct dentry *dentry)
591 struct p9_fid *dfid, *oldfid;
593 struct v9fs_session_info *v9ses;
594 struct dentry *dir_dentry;
596 P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
597 dir->i_ino, old_dentry->d_name.name,
598 dentry->d_name.name);
600 v9ses = v9fs_inode2v9ses(dir);
601 dir_dentry = v9fs_dentry_from_dir_inode(dir);
602 dfid = v9fs_fid_lookup(dir_dentry);
604 return PTR_ERR(dfid);
606 oldfid = v9fs_fid_lookup(old_dentry);
608 return PTR_ERR(oldfid);
610 name = (char *) dentry->d_name.name;
612 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
615 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
619 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
620 /* Get the latest stat info from server. */
622 struct p9_stat_dotl *st;
624 fid = v9fs_fid_lookup(old_dentry);
628 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
632 v9fs_stat2inode_dotl(st, old_dentry->d_inode);
636 /* Caching disabled. No need to get upto date stat info.
637 * This dentry will be released immediately. So, just hold the
640 ihold(old_dentry->d_inode);
642 d_instantiate(dentry, old_dentry->d_inode);
648 * v9fs_vfs_mknod_dotl - create a special file
649 * @dir: inode destination for new link
650 * @dentry: dentry for file
651 * @mode: mode for creation
652 * @rdev: device associated with special file
656 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
662 struct v9fs_session_info *v9ses;
663 struct p9_fid *fid = NULL, *dfid = NULL;
667 struct dentry *dir_dentry;
668 struct posix_acl *dacl = NULL, *pacl = NULL;
670 P9_DPRINTK(P9_DEBUG_VFS,
671 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
672 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
674 if (!new_valid_dev(rdev))
677 v9ses = v9fs_inode2v9ses(dir);
678 dir_dentry = v9fs_dentry_from_dir_inode(dir);
679 dfid = v9fs_fid_lookup(dir_dentry);
682 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
687 gid = v9fs_get_fsgid_for_create(dir);
689 /* Update mode based on ACL value */
690 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
692 P9_DPRINTK(P9_DEBUG_VFS,
693 "Failed to get acl values in mknod %d\n", err);
696 name = (char *) dentry->d_name.name;
698 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
702 /* instantiate inode and assign the unopened fid to the dentry */
703 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
704 fid = p9_client_walk(dfid, 1, &name, 1);
707 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
713 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
715 err = PTR_ERR(inode);
716 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
720 d_instantiate(dentry, inode);
721 err = v9fs_fid_add(dentry, fid);
727 * Not in cached mode. No need to populate inode with stat.
728 * socket syscall returns a fd, so we need instantiate
730 inode = v9fs_get_inode(dir->i_sb, mode);
732 err = PTR_ERR(inode);
735 d_instantiate(dentry, inode);
737 /* Now set the ACL based on the default value */
738 v9fs_set_create_acl(dentry, dacl, pacl);
741 p9_client_clunk(fid);
746 * v9fs_vfs_follow_link_dotl - follow a symlink path
747 * @dentry: dentry for symlink
753 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
757 char *link = __getname();
760 P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
763 link = ERR_PTR(-ENOMEM);
766 fid = v9fs_fid_lookup(dentry);
769 link = ERR_PTR(PTR_ERR(fid));
772 retval = p9_client_readlink(fid, &target);
774 strcpy(link, target);
779 link = ERR_PTR(retval);
781 nd_set_link(nd, link);
785 const struct inode_operations v9fs_dir_inode_operations_dotl = {
786 .create = v9fs_vfs_create_dotl,
787 .lookup = v9fs_vfs_lookup,
788 .link = v9fs_vfs_link_dotl,
789 .symlink = v9fs_vfs_symlink_dotl,
790 .unlink = v9fs_vfs_unlink,
791 .mkdir = v9fs_vfs_mkdir_dotl,
792 .rmdir = v9fs_vfs_rmdir,
793 .mknod = v9fs_vfs_mknod_dotl,
794 .rename = v9fs_vfs_rename,
795 .getattr = v9fs_vfs_getattr_dotl,
796 .setattr = v9fs_vfs_setattr_dotl,
797 .setxattr = generic_setxattr,
798 .getxattr = generic_getxattr,
799 .removexattr = generic_removexattr,
800 .listxattr = v9fs_listxattr,
801 .check_acl = v9fs_check_acl,
804 const struct inode_operations v9fs_file_inode_operations_dotl = {
805 .getattr = v9fs_vfs_getattr_dotl,
806 .setattr = v9fs_vfs_setattr_dotl,
807 .setxattr = generic_setxattr,
808 .getxattr = generic_getxattr,
809 .removexattr = generic_removexattr,
810 .listxattr = v9fs_listxattr,
811 .check_acl = v9fs_check_acl,
814 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
815 .readlink = generic_readlink,
816 .follow_link = v9fs_vfs_follow_link_dotl,
817 .put_link = v9fs_vfs_put_link,
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,