2 * linux/fs/9p/vfs_inode.c
4 * This file contains vfs inode ops for the 9P2000 protocol.
6 * Copyright (C) 2004 by Eric Van Hensbergen <ericvh@gmail.com>
7 * Copyright (C) 2002 by Ron Minnich <rminnich@lanl.gov>
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 <net/9p/9p.h>
39 #include <net/9p/client.h>
46 static const struct inode_operations v9fs_dir_inode_operations
;
47 static const struct inode_operations v9fs_dir_inode_operations_dotu
;
48 static const struct inode_operations v9fs_dir_inode_operations_dotl
;
49 static const struct inode_operations v9fs_file_inode_operations
;
50 static const struct inode_operations v9fs_file_inode_operations_dotl
;
51 static const struct inode_operations v9fs_symlink_inode_operations
;
52 static const struct inode_operations v9fs_symlink_inode_operations_dotl
;
55 * unixmode2p9mode - convert unix mode bits to plan 9
56 * @v9ses: v9fs session information
57 * @mode: mode to convert
61 static int unixmode2p9mode(struct v9fs_session_info
*v9ses
, int mode
)
67 if (v9fs_proto_dotu(v9ses
)) {
70 if (v9ses
->nodev
== 0) {
74 res
|= P9_DMNAMEDPIPE
;
81 if ((mode
& S_ISUID
) == S_ISUID
)
83 if ((mode
& S_ISGID
) == S_ISGID
)
85 if ((mode
& S_ISVTX
) == S_ISVTX
)
87 if ((mode
& P9_DMLINK
))
95 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
96 * @v9ses: v9fs session information
97 * @mode: mode to convert
101 static int p9mode2unixmode(struct v9fs_session_info
*v9ses
, int mode
)
107 if ((mode
& P9_DMDIR
) == P9_DMDIR
)
109 else if ((mode
& P9_DMSYMLINK
) && (v9fs_proto_dotu(v9ses
)))
111 else if ((mode
& P9_DMSOCKET
) && (v9fs_proto_dotu(v9ses
))
112 && (v9ses
->nodev
== 0))
114 else if ((mode
& P9_DMNAMEDPIPE
) && (v9fs_proto_dotu(v9ses
))
115 && (v9ses
->nodev
== 0))
117 else if ((mode
& P9_DMDEVICE
) && (v9fs_proto_dotu(v9ses
))
118 && (v9ses
->nodev
== 0))
123 if (v9fs_proto_dotu(v9ses
)) {
124 if ((mode
& P9_DMSETUID
) == P9_DMSETUID
)
127 if ((mode
& P9_DMSETGID
) == P9_DMSETGID
)
130 if ((mode
& P9_DMSETVTX
) == P9_DMSETVTX
)
138 * v9fs_uflags2omode- convert posix open flags to plan 9 mode bits
139 * @uflags: flags to convert
140 * @extended: if .u extensions are active
143 int v9fs_uflags2omode(int uflags
, int extended
)
163 if (uflags
& O_TRUNC
)
170 if (uflags
& O_APPEND
)
178 * v9fs_blank_wstat - helper function to setup a 9P stat structure
179 * @wstat: structure to initialize
184 v9fs_blank_wstat(struct p9_wstat
*wstat
)
188 wstat
->qid
.type
= ~0;
189 wstat
->qid
.version
= ~0;
190 *((long long *)&wstat
->qid
.path
) = ~0;
202 wstat
->extension
= NULL
;
205 #ifdef CONFIG_9P_FSCACHE
207 * v9fs_alloc_inode - helper function to allocate an inode
208 * This callback is executed before setting up the inode so that we
209 * can associate a vcookie with each inode.
213 struct inode
*v9fs_alloc_inode(struct super_block
*sb
)
215 struct v9fs_cookie
*vcookie
;
216 vcookie
= (struct v9fs_cookie
*)kmem_cache_alloc(vcookie_cache
,
221 vcookie
->fscache
= NULL
;
223 spin_lock_init(&vcookie
->lock
);
224 return &vcookie
->inode
;
228 * v9fs_destroy_inode - destroy an inode
232 void v9fs_destroy_inode(struct inode
*inode
)
234 kmem_cache_free(vcookie_cache
, v9fs_inode2cookie(inode
));
239 * v9fs_get_inode - helper function to setup an inode
241 * @mode: mode to setup inode with
245 struct inode
*v9fs_get_inode(struct super_block
*sb
, int mode
)
249 struct v9fs_session_info
*v9ses
= sb
->s_fs_info
;
251 P9_DPRINTK(P9_DEBUG_VFS
, "super block: %p mode: %o\n", sb
, mode
);
253 inode
= new_inode(sb
);
255 P9_EPRINTK(KERN_WARNING
, "Problem allocating inode\n");
256 return ERR_PTR(-ENOMEM
);
259 inode_init_owner(inode
, NULL
, mode
);
262 inode
->i_atime
= inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
263 inode
->i_mapping
->a_ops
= &v9fs_addr_operations
;
265 switch (mode
& S_IFMT
) {
270 if (!v9fs_proto_dotu(v9ses
)) {
271 P9_DPRINTK(P9_DEBUG_ERROR
,
272 "special files without extended mode\n");
276 init_special_inode(inode
, inode
->i_mode
, inode
->i_rdev
);
279 if (v9fs_proto_dotl(v9ses
)) {
280 inode
->i_op
= &v9fs_file_inode_operations_dotl
;
281 inode
->i_fop
= &v9fs_file_operations_dotl
;
283 inode
->i_op
= &v9fs_file_inode_operations
;
284 inode
->i_fop
= &v9fs_file_operations
;
290 if (!v9fs_proto_dotu(v9ses
) && !v9fs_proto_dotl(v9ses
)) {
291 P9_DPRINTK(P9_DEBUG_ERROR
, "extended modes used with "
292 "legacy protocol.\n");
297 if (v9fs_proto_dotl(v9ses
))
298 inode
->i_op
= &v9fs_symlink_inode_operations_dotl
;
300 inode
->i_op
= &v9fs_symlink_inode_operations
;
305 if (v9fs_proto_dotl(v9ses
))
306 inode
->i_op
= &v9fs_dir_inode_operations_dotl
;
307 else if (v9fs_proto_dotu(v9ses
))
308 inode
->i_op
= &v9fs_dir_inode_operations_dotu
;
310 inode
->i_op
= &v9fs_dir_inode_operations
;
312 if (v9fs_proto_dotl(v9ses
))
313 inode
->i_fop
= &v9fs_dir_operations_dotl
;
315 inode
->i_fop
= &v9fs_dir_operations
;
319 P9_DPRINTK(P9_DEBUG_ERROR
, "BAD mode 0x%x S_IFMT 0x%x\n",
320 mode
, mode
& S_IFMT
);
333 static struct v9fs_fid*
334 v9fs_clone_walk(struct v9fs_session_info *v9ses, u32 fid, struct dentry *dentry)
338 struct v9fs_fid *ret;
339 struct v9fs_fcall *fcall;
341 nfid = v9fs_get_idpool(&v9ses->fidpool);
343 eprintk(KERN_WARNING, "no free fids available\n");
344 return ERR_PTR(-ENOSPC);
347 err = v9fs_t_walk(v9ses, fid, nfid, (char *) dentry->d_name.name,
351 if (fcall && fcall->id == RWALK)
354 PRINT_FCALL_ERROR("walk error", fcall);
355 v9fs_put_idpool(nfid, &v9ses->fidpool);
361 ret = v9fs_fid_create(v9ses, nfid);
367 err = v9fs_fid_insert(ret, dentry);
369 v9fs_fid_destroy(ret);
376 v9fs_t_clunk(v9ses, nfid);
386 * v9fs_clear_inode - release an inode
387 * @inode: inode to release
390 void v9fs_evict_inode(struct inode
*inode
)
392 truncate_inode_pages(inode
->i_mapping
, 0);
393 end_writeback(inode
);
394 filemap_fdatawrite(inode
->i_mapping
);
396 #ifdef CONFIG_9P_FSCACHE
397 v9fs_cache_inode_put_cookie(inode
);
402 * v9fs_inode_from_fid - populate an inode by issuing a attribute request
403 * @v9ses: session information
404 * @fid: fid to issue attribute request for
405 * @sb: superblock on which to create inode
409 static struct inode
*
410 v9fs_inode_from_fid(struct v9fs_session_info
*v9ses
, struct p9_fid
*fid
,
411 struct super_block
*sb
)
418 st
= p9_client_stat(fid
);
422 umode
= p9mode2unixmode(v9ses
, st
->mode
);
423 ret
= v9fs_get_inode(sb
, umode
);
429 v9fs_stat2inode(st
, ret
, sb
);
430 ret
->i_ino
= v9fs_qid2ino(&st
->qid
);
432 #ifdef CONFIG_9P_FSCACHE
433 v9fs_vcookie_set_qid(ret
, &st
->qid
);
434 v9fs_cache_inode_get_cookie(ret
);
448 * v9fs_remove - helper function to remove files and directories
449 * @dir: directory inode that is being deleted
450 * @file: dentry that is being deleted
451 * @rmdir: removing a directory
455 static int v9fs_remove(struct inode
*dir
, struct dentry
*file
, int rmdir
)
458 struct inode
*file_inode
;
459 struct p9_fid
*v9fid
;
461 P9_DPRINTK(P9_DEBUG_VFS
, "inode: %p dentry: %p rmdir: %d\n", dir
, file
,
464 file_inode
= file
->d_inode
;
465 v9fid
= v9fs_fid_clone(file
);
467 return PTR_ERR(v9fid
);
469 retval
= p9_client_remove(v9fid
);
471 drop_nlink(file_inode
);
476 v9fs_open_created(struct inode
*inode
, struct file
*file
)
483 * v9fs_create - Create a file
484 * @v9ses: session information
485 * @dir: directory that dentry is being created in
486 * @dentry: dentry that is being created
487 * @extension: 9p2000.u extension string to support devices, etc.
488 * @perm: create permissions
492 static struct p9_fid
*
493 v9fs_create(struct v9fs_session_info
*v9ses
, struct inode
*dir
,
494 struct dentry
*dentry
, char *extension
, u32 perm
, u8 mode
)
498 struct p9_fid
*dfid
, *ofid
, *fid
;
501 P9_DPRINTK(P9_DEBUG_VFS
, "name %s\n", dentry
->d_name
.name
);
506 name
= (char *) dentry
->d_name
.name
;
507 dfid
= v9fs_fid_lookup(dentry
->d_parent
);
510 P9_DPRINTK(P9_DEBUG_VFS
, "fid lookup failed %d\n", err
);
514 /* clone a fid to use for creation */
515 ofid
= p9_client_walk(dfid
, 0, NULL
, 1);
518 P9_DPRINTK(P9_DEBUG_VFS
, "p9_client_walk failed %d\n", err
);
522 err
= p9_client_fcreate(ofid
, name
, perm
, mode
, extension
);
524 P9_DPRINTK(P9_DEBUG_VFS
, "p9_client_fcreate failed %d\n", err
);
528 /* now walk from the parent so we can get unopened fid */
529 fid
= p9_client_walk(dfid
, 1, &name
, 1);
532 P9_DPRINTK(P9_DEBUG_VFS
, "p9_client_walk failed %d\n", err
);
537 /* instantiate inode and assign the unopened fid to the dentry */
538 inode
= v9fs_inode_from_fid(v9ses
, fid
, dir
->i_sb
);
540 err
= PTR_ERR(inode
);
541 P9_DPRINTK(P9_DEBUG_VFS
, "inode creation failed %d\n", err
);
546 dentry
->d_op
= &v9fs_cached_dentry_operations
;
548 dentry
->d_op
= &v9fs_dentry_operations
;
550 d_instantiate(dentry
, inode
);
551 err
= v9fs_fid_add(dentry
, fid
);
559 p9_client_clunk(ofid
);
562 p9_client_clunk(fid
);
568 * v9fs_vfs_create - VFS hook to create files
569 * @dir: directory inode that is being created
570 * @dentry: dentry that is being deleted
571 * @mode: create permissions
572 * @nd: path information
577 v9fs_vfs_create(struct inode
*dir
, struct dentry
*dentry
, int mode
,
578 struct nameidata
*nd
)
583 struct v9fs_session_info
*v9ses
;
589 v9ses
= v9fs_inode2v9ses(dir
);
590 perm
= unixmode2p9mode(v9ses
, mode
);
591 if (nd
&& nd
->flags
& LOOKUP_OPEN
)
592 flags
= nd
->intent
.open
.flags
- 1;
596 fid
= v9fs_create(v9ses
, dir
, dentry
, NULL
, perm
,
597 v9fs_uflags2omode(flags
,
598 v9fs_proto_dotu(v9ses
)));
605 /* if we are opening a file, assign the open fid to the file */
606 if (nd
&& nd
->flags
& LOOKUP_OPEN
) {
607 filp
= lookup_instantiate_filp(nd
, dentry
, v9fs_open_created
);
613 filp
->private_data
= fid
;
615 p9_client_clunk(fid
);
621 p9_client_clunk(fid
);
627 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
628 * @dir: inode that is being unlinked
629 * @dentry: dentry that is being unlinked
630 * @mode: mode for new directory
634 static int v9fs_vfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
638 struct v9fs_session_info
*v9ses
;
641 P9_DPRINTK(P9_DEBUG_VFS
, "name %s\n", dentry
->d_name
.name
);
643 v9ses
= v9fs_inode2v9ses(dir
);
644 perm
= unixmode2p9mode(v9ses
, mode
| S_IFDIR
);
645 fid
= v9fs_create(v9ses
, dir
, dentry
, NULL
, perm
, P9_OREAD
);
652 p9_client_clunk(fid
);
658 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
659 * @dir: inode that is being walked from
660 * @dentry: dentry that is being walked to?
661 * @nameidata: path data
665 static struct dentry
*v9fs_vfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
666 struct nameidata
*nameidata
)
668 struct super_block
*sb
;
669 struct v9fs_session_info
*v9ses
;
670 struct p9_fid
*dfid
, *fid
;
675 P9_DPRINTK(P9_DEBUG_VFS
, "dir: %p dentry: (%s) %p nameidata: %p\n",
676 dir
, dentry
->d_name
.name
, dentry
, nameidata
);
678 if (dentry
->d_name
.len
> NAME_MAX
)
679 return ERR_PTR(-ENAMETOOLONG
);
682 v9ses
= v9fs_inode2v9ses(dir
);
683 dfid
= v9fs_fid_lookup(dentry
->d_parent
);
685 return ERR_CAST(dfid
);
687 name
= (char *) dentry
->d_name
.name
;
688 fid
= p9_client_walk(dfid
, 1, &name
, 1);
690 result
= PTR_ERR(fid
);
691 if (result
== -ENOENT
) {
696 return ERR_PTR(result
);
699 inode
= v9fs_inode_from_fid(v9ses
, fid
, dir
->i_sb
);
701 result
= PTR_ERR(inode
);
706 result
= v9fs_fid_add(dentry
, fid
);
712 dentry
->d_op
= &v9fs_cached_dentry_operations
;
714 dentry
->d_op
= &v9fs_dentry_operations
;
716 d_add(dentry
, inode
);
720 p9_client_clunk(fid
);
722 return ERR_PTR(result
);
726 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
727 * @i: inode that is being unlinked
728 * @d: dentry that is being unlinked
732 static int v9fs_vfs_unlink(struct inode
*i
, struct dentry
*d
)
734 return v9fs_remove(i
, d
, 0);
738 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
739 * @i: inode that is being unlinked
740 * @d: dentry that is being unlinked
744 static int v9fs_vfs_rmdir(struct inode
*i
, struct dentry
*d
)
746 return v9fs_remove(i
, d
, 1);
750 * v9fs_vfs_rename - VFS hook to rename an inode
751 * @old_dir: old dir inode
752 * @old_dentry: old dentry
753 * @new_dir: new dir inode
754 * @new_dentry: new dentry
759 v9fs_vfs_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
760 struct inode
*new_dir
, struct dentry
*new_dentry
)
762 struct inode
*old_inode
;
763 struct v9fs_session_info
*v9ses
;
764 struct p9_fid
*oldfid
;
765 struct p9_fid
*olddirfid
;
766 struct p9_fid
*newdirfid
;
767 struct p9_wstat wstat
;
770 P9_DPRINTK(P9_DEBUG_VFS
, "\n");
772 old_inode
= old_dentry
->d_inode
;
773 v9ses
= v9fs_inode2v9ses(old_inode
);
774 oldfid
= v9fs_fid_lookup(old_dentry
);
776 return PTR_ERR(oldfid
);
778 olddirfid
= v9fs_fid_clone(old_dentry
->d_parent
);
779 if (IS_ERR(olddirfid
)) {
780 retval
= PTR_ERR(olddirfid
);
784 newdirfid
= v9fs_fid_clone(new_dentry
->d_parent
);
785 if (IS_ERR(newdirfid
)) {
786 retval
= PTR_ERR(newdirfid
);
790 if (v9fs_proto_dotl(v9ses
)) {
791 retval
= p9_client_rename(oldfid
, newdirfid
,
792 (char *) new_dentry
->d_name
.name
);
793 if (retval
!= -ENOSYS
)
797 /* 9P can only handle file rename in the same directory */
798 if (memcmp(&olddirfid
->qid
, &newdirfid
->qid
, sizeof(newdirfid
->qid
))) {
799 P9_DPRINTK(P9_DEBUG_ERROR
,
800 "old dir and new dir are different\n");
805 v9fs_blank_wstat(&wstat
);
806 wstat
.muid
= v9ses
->uname
;
807 wstat
.name
= (char *) new_dentry
->d_name
.name
;
808 retval
= p9_client_wstat(oldfid
, &wstat
);
811 p9_client_clunk(newdirfid
);
814 p9_client_clunk(olddirfid
);
821 * v9fs_vfs_getattr - retrieve file metadata
822 * @mnt: mount information
823 * @dentry: file to get attributes on
824 * @stat: metadata structure to populate
829 v9fs_vfs_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
,
833 struct v9fs_session_info
*v9ses
;
837 P9_DPRINTK(P9_DEBUG_VFS
, "dentry: %p\n", dentry
);
839 v9ses
= v9fs_inode2v9ses(dentry
->d_inode
);
840 if (v9ses
->cache
== CACHE_LOOSE
|| v9ses
->cache
== CACHE_FSCACHE
)
841 return simple_getattr(mnt
, dentry
, stat
);
843 fid
= v9fs_fid_lookup(dentry
);
847 st
= p9_client_stat(fid
);
851 v9fs_stat2inode(st
, dentry
->d_inode
, dentry
->d_inode
->i_sb
);
852 generic_fillattr(dentry
->d_inode
, stat
);
859 * v9fs_vfs_setattr - set file metadata
860 * @dentry: file whose metadata to set
861 * @iattr: metadata assignment structure
865 static int v9fs_vfs_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
868 struct v9fs_session_info
*v9ses
;
870 struct p9_wstat wstat
;
872 P9_DPRINTK(P9_DEBUG_VFS
, "\n");
874 v9ses
= v9fs_inode2v9ses(dentry
->d_inode
);
875 fid
= v9fs_fid_lookup(dentry
);
879 v9fs_blank_wstat(&wstat
);
880 if (iattr
->ia_valid
& ATTR_MODE
)
881 wstat
.mode
= unixmode2p9mode(v9ses
, iattr
->ia_mode
);
883 if (iattr
->ia_valid
& ATTR_MTIME
)
884 wstat
.mtime
= iattr
->ia_mtime
.tv_sec
;
886 if (iattr
->ia_valid
& ATTR_ATIME
)
887 wstat
.atime
= iattr
->ia_atime
.tv_sec
;
889 if (iattr
->ia_valid
& ATTR_SIZE
)
890 wstat
.length
= iattr
->ia_size
;
892 if (v9fs_proto_dotu(v9ses
)) {
893 if (iattr
->ia_valid
& ATTR_UID
)
894 wstat
.n_uid
= iattr
->ia_uid
;
896 if (iattr
->ia_valid
& ATTR_GID
)
897 wstat
.n_gid
= iattr
->ia_gid
;
900 retval
= p9_client_wstat(fid
, &wstat
);
904 if ((iattr
->ia_valid
& ATTR_SIZE
) &&
905 iattr
->ia_size
!= i_size_read(dentry
->d_inode
)) {
906 retval
= vmtruncate(dentry
->d_inode
, iattr
->ia_size
);
911 setattr_copy(dentry
->d_inode
, iattr
);
912 mark_inode_dirty(dentry
->d_inode
);
917 * v9fs_stat2inode - populate an inode structure with mistat info
918 * @stat: Plan 9 metadata (mistat) structure
919 * @inode: inode to populate
920 * @sb: superblock of filesystem
925 v9fs_stat2inode(struct p9_wstat
*stat
, struct inode
*inode
,
926 struct super_block
*sb
)
930 unsigned int i_nlink
;
931 struct v9fs_session_info
*v9ses
= sb
->s_fs_info
;
935 inode
->i_atime
.tv_sec
= stat
->atime
;
936 inode
->i_mtime
.tv_sec
= stat
->mtime
;
937 inode
->i_ctime
.tv_sec
= stat
->mtime
;
939 inode
->i_uid
= v9ses
->dfltuid
;
940 inode
->i_gid
= v9ses
->dfltgid
;
942 if (v9fs_proto_dotu(v9ses
)) {
943 inode
->i_uid
= stat
->n_uid
;
944 inode
->i_gid
= stat
->n_gid
;
946 if ((S_ISREG(inode
->i_mode
)) || (S_ISDIR(inode
->i_mode
))) {
947 if (v9fs_proto_dotu(v9ses
) && (stat
->extension
[0] != '\0')) {
949 * Hadlink support got added later to
950 * to the .u extension. So there can be
951 * server out there that doesn't support
952 * this even with .u extension. So check
953 * for non NULL stat->extension
955 strncpy(ext
, stat
->extension
, sizeof(ext
));
956 /* HARDLINKCOUNT %u */
957 sscanf(ext
, "%13s %u", tag_name
, &i_nlink
);
958 if (!strncmp(tag_name
, "HARDLINKCOUNT", 13))
959 inode
->i_nlink
= i_nlink
;
962 inode
->i_mode
= p9mode2unixmode(v9ses
, stat
->mode
);
963 if ((S_ISBLK(inode
->i_mode
)) || (S_ISCHR(inode
->i_mode
))) {
968 strncpy(ext
, stat
->extension
, sizeof(ext
));
969 sscanf(ext
, "%c %u %u", &type
, &major
, &minor
);
972 inode
->i_mode
&= ~S_IFBLK
;
973 inode
->i_mode
|= S_IFCHR
;
978 P9_DPRINTK(P9_DEBUG_ERROR
,
979 "Unknown special type %c %s\n", type
,
982 inode
->i_rdev
= MKDEV(major
, minor
);
983 init_special_inode(inode
, inode
->i_mode
, inode
->i_rdev
);
987 i_size_write(inode
, stat
->length
);
989 /* not real number of blocks, but 512 byte ones ... */
990 inode
->i_blocks
= (i_size_read(inode
) + 512 - 1) >> 9;
994 * v9fs_qid2ino - convert qid into inode number
997 * BUG: potential for inode number collisions?
1000 ino_t
v9fs_qid2ino(struct p9_qid
*qid
)
1002 u64 path
= qid
->path
+ 2;
1005 if (sizeof(ino_t
) == sizeof(path
))
1006 memcpy(&i
, &path
, sizeof(ino_t
));
1008 i
= (ino_t
) (path
^ (path
>> 32));
1014 * v9fs_readlink - read a symlink's location (internal version)
1015 * @dentry: dentry for symlink
1016 * @buffer: buffer to load symlink location into
1017 * @buflen: length of buffer
1021 static int v9fs_readlink(struct dentry
*dentry
, char *buffer
, int buflen
)
1025 struct v9fs_session_info
*v9ses
;
1027 struct p9_wstat
*st
;
1029 P9_DPRINTK(P9_DEBUG_VFS
, " %s\n", dentry
->d_name
.name
);
1031 v9ses
= v9fs_inode2v9ses(dentry
->d_inode
);
1032 fid
= v9fs_fid_lookup(dentry
);
1034 return PTR_ERR(fid
);
1036 if (!v9fs_proto_dotu(v9ses
))
1039 st
= p9_client_stat(fid
);
1043 if (!(st
->mode
& P9_DMSYMLINK
)) {
1048 /* copy extension buffer into buffer */
1049 strncpy(buffer
, st
->extension
, buflen
);
1051 P9_DPRINTK(P9_DEBUG_VFS
,
1052 "%s -> %s (%s)\n", dentry
->d_name
.name
, st
->extension
, buffer
);
1054 retval
= strnlen(buffer
, buflen
);
1061 * v9fs_vfs_follow_link - follow a symlink path
1062 * @dentry: dentry for symlink
1067 static void *v9fs_vfs_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1070 char *link
= __getname();
1072 P9_DPRINTK(P9_DEBUG_VFS
, "%s n", dentry
->d_name
.name
);
1075 link
= ERR_PTR(-ENOMEM
);
1077 len
= v9fs_readlink(dentry
, link
, PATH_MAX
);
1081 link
= ERR_PTR(len
);
1083 link
[min(len
, PATH_MAX
-1)] = 0;
1085 nd_set_link(nd
, link
);
1091 * v9fs_vfs_put_link - release a symlink path
1092 * @dentry: dentry for symlink
1099 v9fs_vfs_put_link(struct dentry
*dentry
, struct nameidata
*nd
, void *p
)
1101 char *s
= nd_get_link(nd
);
1103 P9_DPRINTK(P9_DEBUG_VFS
, " %s %s\n", dentry
->d_name
.name
,
1104 IS_ERR(s
) ? "<error>" : s
);
1110 * v9fs_vfs_mkspecial - create a special file
1111 * @dir: inode to create special file in
1112 * @dentry: dentry to create
1113 * @mode: mode to create special file
1114 * @extension: 9p2000.u format extension string representing special file
1118 static int v9fs_vfs_mkspecial(struct inode
*dir
, struct dentry
*dentry
,
1119 int mode
, const char *extension
)
1122 struct v9fs_session_info
*v9ses
;
1125 v9ses
= v9fs_inode2v9ses(dir
);
1126 if (!v9fs_proto_dotu(v9ses
)) {
1127 P9_DPRINTK(P9_DEBUG_ERROR
, "not extended\n");
1131 perm
= unixmode2p9mode(v9ses
, mode
);
1132 fid
= v9fs_create(v9ses
, dir
, dentry
, (char *) extension
, perm
,
1135 return PTR_ERR(fid
);
1137 p9_client_clunk(fid
);
1142 * v9fs_vfs_symlink - helper function to create symlinks
1143 * @dir: directory inode containing symlink
1144 * @dentry: dentry for symlink
1145 * @symname: symlink data
1147 * See Also: 9P2000.u RFC for more information
1152 v9fs_vfs_symlink(struct inode
*dir
, struct dentry
*dentry
, const char *symname
)
1154 P9_DPRINTK(P9_DEBUG_VFS
, " %lu,%s,%s\n", dir
->i_ino
,
1155 dentry
->d_name
.name
, symname
);
1157 return v9fs_vfs_mkspecial(dir
, dentry
, S_IFLNK
, symname
);
1161 * v9fs_vfs_link - create a hardlink
1162 * @old_dentry: dentry for file to link to
1163 * @dir: inode destination for new link
1164 * @dentry: dentry for link
1169 v9fs_vfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1170 struct dentry
*dentry
)
1173 struct p9_fid
*oldfid
;
1176 P9_DPRINTK(P9_DEBUG_VFS
,
1177 " %lu,%s,%s\n", dir
->i_ino
, dentry
->d_name
.name
,
1178 old_dentry
->d_name
.name
);
1180 oldfid
= v9fs_fid_clone(old_dentry
);
1182 return PTR_ERR(oldfid
);
1185 if (unlikely(!name
)) {
1190 sprintf(name
, "%d\n", oldfid
->fid
);
1191 retval
= v9fs_vfs_mkspecial(dir
, dentry
, P9_DMLINK
, name
);
1195 p9_client_clunk(oldfid
);
1200 * v9fs_vfs_mknod - create a special file
1201 * @dir: inode destination for new link
1202 * @dentry: dentry for file
1203 * @mode: mode for creation
1204 * @rdev: device associated with special file
1209 v9fs_vfs_mknod(struct inode
*dir
, struct dentry
*dentry
, int mode
, dev_t rdev
)
1214 P9_DPRINTK(P9_DEBUG_VFS
,
1215 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir
->i_ino
,
1216 dentry
->d_name
.name
, mode
, MAJOR(rdev
), MINOR(rdev
));
1218 if (!new_valid_dev(rdev
))
1224 /* build extension */
1226 sprintf(name
, "b %u %u", MAJOR(rdev
), MINOR(rdev
));
1227 else if (S_ISCHR(mode
))
1228 sprintf(name
, "c %u %u", MAJOR(rdev
), MINOR(rdev
));
1229 else if (S_ISFIFO(mode
))
1231 else if (S_ISSOCK(mode
))
1238 retval
= v9fs_vfs_mkspecial(dir
, dentry
, mode
, name
);
1244 static const struct inode_operations v9fs_dir_inode_operations_dotu
= {
1245 .create
= v9fs_vfs_create
,
1246 .lookup
= v9fs_vfs_lookup
,
1247 .symlink
= v9fs_vfs_symlink
,
1248 .link
= v9fs_vfs_link
,
1249 .unlink
= v9fs_vfs_unlink
,
1250 .mkdir
= v9fs_vfs_mkdir
,
1251 .rmdir
= v9fs_vfs_rmdir
,
1252 .mknod
= v9fs_vfs_mknod
,
1253 .rename
= v9fs_vfs_rename
,
1254 .getattr
= v9fs_vfs_getattr
,
1255 .setattr
= v9fs_vfs_setattr
,
1258 static const struct inode_operations v9fs_dir_inode_operations_dotl
= {
1259 .create
= v9fs_vfs_create
,
1260 .lookup
= v9fs_vfs_lookup
,
1261 .symlink
= v9fs_vfs_symlink
,
1262 .link
= v9fs_vfs_link
,
1263 .unlink
= v9fs_vfs_unlink
,
1264 .mkdir
= v9fs_vfs_mkdir
,
1265 .rmdir
= v9fs_vfs_rmdir
,
1266 .mknod
= v9fs_vfs_mknod
,
1267 .rename
= v9fs_vfs_rename
,
1268 .getattr
= v9fs_vfs_getattr
,
1269 .setattr
= v9fs_vfs_setattr
,
1272 static const struct inode_operations v9fs_dir_inode_operations
= {
1273 .create
= v9fs_vfs_create
,
1274 .lookup
= v9fs_vfs_lookup
,
1275 .unlink
= v9fs_vfs_unlink
,
1276 .mkdir
= v9fs_vfs_mkdir
,
1277 .rmdir
= v9fs_vfs_rmdir
,
1278 .mknod
= v9fs_vfs_mknod
,
1279 .rename
= v9fs_vfs_rename
,
1280 .getattr
= v9fs_vfs_getattr
,
1281 .setattr
= v9fs_vfs_setattr
,
1284 static const struct inode_operations v9fs_file_inode_operations
= {
1285 .getattr
= v9fs_vfs_getattr
,
1286 .setattr
= v9fs_vfs_setattr
,
1289 static const struct inode_operations v9fs_file_inode_operations_dotl
= {
1290 .getattr
= v9fs_vfs_getattr
,
1291 .setattr
= v9fs_vfs_setattr
,
1294 static const struct inode_operations v9fs_symlink_inode_operations
= {
1295 .readlink
= generic_readlink
,
1296 .follow_link
= v9fs_vfs_follow_link
,
1297 .put_link
= v9fs_vfs_put_link
,
1298 .getattr
= v9fs_vfs_getattr
,
1299 .setattr
= v9fs_vfs_setattr
,
1302 static const struct inode_operations v9fs_symlink_inode_operations_dotl
= {
1303 .readlink
= generic_readlink
,
1304 .follow_link
= v9fs_vfs_follow_link
,
1305 .put_link
= v9fs_vfs_put_link
,
1306 .getattr
= v9fs_vfs_getattr
,
1307 .setattr
= v9fs_vfs_setattr
,