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/smp_lock.h>
34 #include <linux/inet.h>
35 #include <linux/namei.h>
36 #include <linux/idr.h>
44 static struct inode_operations v9fs_dir_inode_operations
;
45 static struct inode_operations v9fs_dir_inode_operations_ext
;
46 static struct inode_operations v9fs_file_inode_operations
;
47 static struct inode_operations v9fs_symlink_inode_operations
;
50 * unixmode2p9mode - convert unix mode bits to plan 9
51 * @v9ses: v9fs session information
52 * @mode: mode to convert
56 static int unixmode2p9mode(struct v9fs_session_info
*v9ses
, int mode
)
62 if (v9ses
->extended
) {
64 res
|= V9FS_DMSYMLINK
;
65 if (v9ses
->nodev
== 0) {
69 res
|= V9FS_DMNAMEDPIPE
;
76 if ((mode
& S_ISUID
) == S_ISUID
)
78 if ((mode
& S_ISGID
) == S_ISGID
)
80 if ((mode
& V9FS_DMLINK
))
88 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
89 * @v9ses: v9fs session information
90 * @mode: mode to convert
94 static int p9mode2unixmode(struct v9fs_session_info
*v9ses
, int mode
)
100 if ((mode
& V9FS_DMDIR
) == V9FS_DMDIR
)
102 else if ((mode
& V9FS_DMSYMLINK
) && (v9ses
->extended
))
104 else if ((mode
& V9FS_DMSOCKET
) && (v9ses
->extended
)
105 && (v9ses
->nodev
== 0))
107 else if ((mode
& V9FS_DMNAMEDPIPE
) && (v9ses
->extended
)
108 && (v9ses
->nodev
== 0))
110 else if ((mode
& V9FS_DMDEVICE
) && (v9ses
->extended
)
111 && (v9ses
->nodev
== 0))
116 if (v9ses
->extended
) {
117 if ((mode
& V9FS_DMSETUID
) == V9FS_DMSETUID
)
120 if ((mode
& V9FS_DMSETGID
) == V9FS_DMSETGID
)
127 int v9fs_uflags2omode(int uflags
)
150 if (uflags
& O_TRUNC
)
153 if (uflags
& O_APPEND
)
160 * v9fs_blank_wstat - helper function to setup a 9P stat structure
161 * @v9ses: 9P session info (for determining extended mode)
162 * @wstat: structure to initialize
167 v9fs_blank_wstat(struct v9fs_wstat
*wstat
)
171 wstat
->qid
.type
= ~0;
172 wstat
->qid
.version
= ~0;
173 *((long long *)&wstat
->qid
.path
) = ~0;
185 wstat
->extension
= NULL
;
189 * v9fs_get_inode - helper function to setup an inode
191 * @mode: mode to setup inode with
195 struct inode
*v9fs_get_inode(struct super_block
*sb
, int mode
)
198 struct v9fs_session_info
*v9ses
= sb
->s_fs_info
;
200 dprintk(DEBUG_VFS
, "super block: %p mode: %o\n", sb
, mode
);
202 inode
= new_inode(sb
);
204 inode
->i_mode
= mode
;
205 inode
->i_uid
= current
->fsuid
;
206 inode
->i_gid
= current
->fsgid
;
207 inode
->i_blksize
= sb
->s_blocksize
;
210 inode
->i_atime
= inode
->i_mtime
= inode
->i_ctime
= CURRENT_TIME
;
211 inode
->i_mapping
->a_ops
= &v9fs_addr_operations
;
213 switch (mode
& S_IFMT
) {
218 if(!v9ses
->extended
) {
219 dprintk(DEBUG_ERROR
, "special files without extended mode\n");
220 return ERR_PTR(-EINVAL
);
222 init_special_inode(inode
, inode
->i_mode
,
226 inode
->i_op
= &v9fs_file_inode_operations
;
227 inode
->i_fop
= &v9fs_file_operations
;
230 if(!v9ses
->extended
) {
231 dprintk(DEBUG_ERROR
, "extended modes used w/o 9P2000.u\n");
232 return ERR_PTR(-EINVAL
);
234 inode
->i_op
= &v9fs_symlink_inode_operations
;
239 inode
->i_op
= &v9fs_dir_inode_operations_ext
;
241 inode
->i_op
= &v9fs_dir_inode_operations
;
242 inode
->i_fop
= &v9fs_dir_operations
;
245 dprintk(DEBUG_ERROR
, "BAD mode 0x%x S_IFMT 0x%x\n",
246 mode
, mode
& S_IFMT
);
247 return ERR_PTR(-EINVAL
);
250 eprintk(KERN_WARNING
, "Problem allocating inode\n");
251 return ERR_PTR(-ENOMEM
);
257 v9fs_create(struct v9fs_session_info
*v9ses
, u32 pfid
, char *name
, u32 perm
,
258 u8 mode
, char *extension
, u32
*fidp
, struct v9fs_qid
*qid
, u32
*iounit
)
262 struct v9fs_fcall
*fcall
;
264 fid
= v9fs_get_idpool(&v9ses
->fidpool
);
266 eprintk(KERN_WARNING
, "no free fids available\n");
270 err
= v9fs_t_walk(v9ses
, pfid
, fid
, NULL
, &fcall
);
272 PRINT_FCALL_ERROR("clone error", fcall
);
277 err
= v9fs_t_create(v9ses
, fid
, name
, perm
, mode
, extension
, &fcall
);
279 PRINT_FCALL_ERROR("create fails", fcall
);
284 *iounit
= fcall
->params
.rcreate
.iounit
;
287 *qid
= fcall
->params
.rcreate
.qid
;
296 v9fs_t_clunk(v9ses
, fid
);
301 v9fs_put_idpool(fid
, &v9ses
->fidpool
);
307 static struct v9fs_fid
*
308 v9fs_clone_walk(struct v9fs_session_info
*v9ses
, u32 fid
, struct dentry
*dentry
)
312 struct v9fs_fid
*ret
;
313 struct v9fs_fcall
*fcall
;
315 nfid
= v9fs_get_idpool(&v9ses
->fidpool
);
317 eprintk(KERN_WARNING
, "no free fids available\n");
318 return ERR_PTR(-ENOSPC
);
321 err
= v9fs_t_walk(v9ses
, fid
, nfid
, (char *) dentry
->d_name
.name
,
325 PRINT_FCALL_ERROR("walk error", fcall
);
326 v9fs_put_idpool(nfid
, &v9ses
->fidpool
);
332 ret
= v9fs_fid_create(v9ses
, nfid
);
338 err
= v9fs_fid_insert(ret
, dentry
);
340 v9fs_fid_destroy(ret
);
347 v9fs_t_clunk(v9ses
, nfid
);
354 static struct inode
*
355 v9fs_inode_from_fid(struct v9fs_session_info
*v9ses
, u32 fid
,
356 struct super_block
*sb
)
360 struct v9fs_fcall
*fcall
;
363 err
= v9fs_t_stat(v9ses
, fid
, &fcall
);
365 PRINT_FCALL_ERROR("stat error", fcall
);
369 umode
= p9mode2unixmode(v9ses
, fcall
->params
.rstat
.stat
.mode
);
370 ret
= v9fs_get_inode(sb
, umode
);
377 v9fs_stat2inode(&fcall
->params
.rstat
.stat
, ret
, sb
);
390 * v9fs_remove - helper function to remove files and directories
391 * @dir: directory inode that is being deleted
392 * @file: dentry that is being deleted
393 * @rmdir: removing a directory
397 static int v9fs_remove(struct inode
*dir
, struct dentry
*file
, int rmdir
)
399 struct v9fs_fcall
*fcall
= NULL
;
400 struct super_block
*sb
= NULL
;
401 struct v9fs_session_info
*v9ses
= NULL
;
402 struct v9fs_fid
*v9fid
= NULL
;
403 struct inode
*file_inode
= NULL
;
407 dprintk(DEBUG_VFS
, "inode: %p dentry: %p rmdir: %d\n", dir
, file
,
410 file_inode
= file
->d_inode
;
411 sb
= file_inode
->i_sb
;
412 v9ses
= v9fs_inode2v9ses(file_inode
);
413 v9fid
= v9fs_fid_lookup(file
);
423 dprintk(DEBUG_ERROR
, "inode #%lu, no fid!\n",
428 result
= v9fs_t_remove(v9ses
, fid
, &fcall
);
430 PRINT_FCALL_ERROR("remove fails", fcall
);
432 v9fs_put_idpool(fid
, &v9ses
->fidpool
);
433 v9fs_fid_destroy(v9fid
);
441 v9fs_open_created(struct inode
*inode
, struct file
*file
)
447 * v9fs_vfs_create - VFS hook to create files
448 * @inode: directory inode that is being deleted
449 * @dentry: dentry that is being deleted
450 * @mode: create permissions
451 * @nd: path information
456 v9fs_vfs_create(struct inode
*dir
, struct dentry
*dentry
, int mode
,
457 struct nameidata
*nd
)
460 u32 fid
, perm
, iounit
;
462 struct v9fs_session_info
*v9ses
;
463 struct v9fs_fid
*dfid
, *vfid
, *ffid
;
470 v9ses
= v9fs_inode2v9ses(dir
);
471 dfid
= v9fs_fid_lookup(dentry
->d_parent
);
472 perm
= unixmode2p9mode(v9ses
, mode
);
474 if (nd
&& nd
->flags
& LOOKUP_OPEN
)
475 flags
= nd
->intent
.open
.flags
- 1;
479 err
= v9fs_create(v9ses
, dfid
->fid
, (char *) dentry
->d_name
.name
,
480 perm
, v9fs_uflags2omode(flags
), NULL
, &fid
, &qid
, &iounit
);
485 vfid
= v9fs_clone_walk(v9ses
, dfid
->fid
, dentry
);
492 inode
= v9fs_inode_from_fid(v9ses
, vfid
->fid
, dir
->i_sb
);
494 err
= PTR_ERR(inode
);
499 dentry
->d_op
= &v9fs_dentry_operations
;
500 d_instantiate(dentry
, inode
);
502 if (nd
&& nd
->flags
& LOOKUP_OPEN
) {
503 ffid
= v9fs_fid_create(v9ses
, fid
);
507 filp
= lookup_instantiate_filp(nd
, dentry
, v9fs_open_created
);
509 v9fs_fid_destroy(ffid
);
510 return PTR_ERR(filp
);
514 ffid
->rdir_fcall
= NULL
;
516 ffid
->iounit
= iounit
;
518 filp
->private_data
= ffid
;
525 v9fs_fid_destroy(vfid
);
534 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
535 * @inode: inode that is being unlinked
536 * @dentry: dentry that is being unlinked
537 * @mode: mode for new directory
541 static int v9fs_vfs_mkdir(struct inode
*dir
, struct dentry
*dentry
, int mode
)
545 struct v9fs_session_info
*v9ses
;
546 struct v9fs_fid
*dfid
, *vfid
;
551 v9ses
= v9fs_inode2v9ses(dir
);
552 dfid
= v9fs_fid_lookup(dentry
->d_parent
);
553 perm
= unixmode2p9mode(v9ses
, mode
| S_IFDIR
);
555 err
= v9fs_create(v9ses
, dfid
->fid
, (char *) dentry
->d_name
.name
,
556 perm
, V9FS_OREAD
, NULL
, &fid
, NULL
, NULL
);
559 dprintk(DEBUG_ERROR
, "create error %d\n", err
);
563 err
= v9fs_t_clunk(v9ses
, fid
);
565 dprintk(DEBUG_ERROR
, "clunk error %d\n", err
);
569 vfid
= v9fs_clone_walk(v9ses
, dfid
->fid
, dentry
);
576 inode
= v9fs_inode_from_fid(v9ses
, vfid
->fid
, dir
->i_sb
);
578 err
= PTR_ERR(inode
);
583 dentry
->d_op
= &v9fs_dentry_operations
;
584 d_instantiate(dentry
, inode
);
589 v9fs_fid_destroy(vfid
);
595 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
596 * @dir: inode that is being walked from
597 * @dentry: dentry that is being walked to?
598 * @nameidata: path data
602 static struct dentry
*v9fs_vfs_lookup(struct inode
*dir
, struct dentry
*dentry
,
603 struct nameidata
*nameidata
)
605 struct super_block
*sb
;
606 struct v9fs_session_info
*v9ses
;
607 struct v9fs_fid
*dirfid
;
608 struct v9fs_fid
*fid
;
610 struct v9fs_fcall
*fcall
= NULL
;
615 dprintk(DEBUG_VFS
, "dir: %p dentry: (%s) %p nameidata: %p\n",
616 dir
, dentry
->d_name
.name
, dentry
, nameidata
);
619 v9ses
= v9fs_inode2v9ses(dir
);
620 dentry
->d_op
= &v9fs_dentry_operations
;
621 dirfid
= v9fs_fid_lookup(dentry
->d_parent
);
624 dprintk(DEBUG_ERROR
, "no dirfid\n");
625 return ERR_PTR(-EINVAL
);
628 dirfidnum
= dirfid
->fid
;
631 dprintk(DEBUG_ERROR
, "no dirfid for inode %p, #%lu\n",
633 return ERR_PTR(-EBADF
);
636 newfid
= v9fs_get_idpool(&v9ses
->fidpool
);
638 eprintk(KERN_WARNING
, "newfid fails!\n");
639 return ERR_PTR(-ENOSPC
);
642 result
= v9fs_t_walk(v9ses
, dirfidnum
, newfid
,
643 (char *)dentry
->d_name
.name
, NULL
);
645 v9fs_put_idpool(newfid
, &v9ses
->fidpool
);
646 if (result
== -ENOENT
) {
649 "Return negative dentry %p count %d\n",
650 dentry
, atomic_read(&dentry
->d_count
));
653 dprintk(DEBUG_ERROR
, "walk error:%d\n", result
);
657 result
= v9fs_t_stat(v9ses
, newfid
, &fcall
);
659 dprintk(DEBUG_ERROR
, "stat error\n");
663 inode
= v9fs_get_inode(sb
, p9mode2unixmode(v9ses
,
664 fcall
->params
.rstat
.stat
.mode
));
666 if (IS_ERR(inode
) && (PTR_ERR(inode
) == -ENOSPC
)) {
667 eprintk(KERN_WARNING
, "inode alloc failes, returns %ld\n",
674 inode
->i_ino
= v9fs_qid2ino(&fcall
->params
.rstat
.stat
.qid
);
676 fid
= v9fs_fid_create(v9ses
, newfid
);
678 dprintk(DEBUG_ERROR
, "couldn't insert\n");
683 result
= v9fs_fid_insert(fid
, dentry
);
687 fid
->qid
= fcall
->params
.rstat
.stat
.qid
;
688 v9fs_stat2inode(&fcall
->params
.rstat
.stat
, inode
, inode
->i_sb
);
690 d_add(dentry
, inode
);
697 return ERR_PTR(result
);
701 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
702 * @i: inode that is being unlinked
703 * @d: dentry that is being unlinked
707 static int v9fs_vfs_unlink(struct inode
*i
, struct dentry
*d
)
709 return v9fs_remove(i
, d
, 0);
713 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
714 * @i: inode that is being unlinked
715 * @d: dentry that is being unlinked
719 static int v9fs_vfs_rmdir(struct inode
*i
, struct dentry
*d
)
721 return v9fs_remove(i
, d
, 1);
725 * v9fs_vfs_rename - VFS hook to rename an inode
726 * @old_dir: old dir inode
727 * @old_dentry: old dentry
728 * @new_dir: new dir inode
729 * @new_dentry: new dentry
734 v9fs_vfs_rename(struct inode
*old_dir
, struct dentry
*old_dentry
,
735 struct inode
*new_dir
, struct dentry
*new_dentry
)
737 struct inode
*old_inode
= old_dentry
->d_inode
;
738 struct v9fs_session_info
*v9ses
= v9fs_inode2v9ses(old_inode
);
739 struct v9fs_fid
*oldfid
= v9fs_fid_lookup(old_dentry
);
740 struct v9fs_fid
*olddirfid
=
741 v9fs_fid_lookup(old_dentry
->d_parent
);
742 struct v9fs_fid
*newdirfid
=
743 v9fs_fid_lookup(new_dentry
->d_parent
);
744 struct v9fs_wstat wstat
;
745 struct v9fs_fcall
*fcall
= NULL
;
747 int olddirfidnum
= -1;
748 int newdirfidnum
= -1;
751 dprintk(DEBUG_VFS
, "\n");
753 if ((!oldfid
) || (!olddirfid
) || (!newdirfid
)) {
754 dprintk(DEBUG_ERROR
, "problem with arguments\n");
758 /* 9P can only handle file rename in the same directory */
759 if (memcmp(&olddirfid
->qid
, &newdirfid
->qid
, sizeof(newdirfid
->qid
))) {
760 dprintk(DEBUG_ERROR
, "old dir and new dir are different\n");
766 olddirfidnum
= olddirfid
->fid
;
767 newdirfidnum
= newdirfid
->fid
;
770 dprintk(DEBUG_ERROR
, "no fid for old file #%lu\n",
776 v9fs_blank_wstat(&wstat
);
777 wstat
.muid
= v9ses
->name
;
778 wstat
.name
= (char *) new_dentry
->d_name
.name
;
780 retval
= v9fs_t_wstat(v9ses
, fid
, &wstat
, &fcall
);
784 PRINT_FCALL_ERROR("wstat error", fcall
);
791 * v9fs_vfs_getattr - retrieve file metadata
792 * @mnt - mount information
793 * @dentry - file to get attributes on
794 * @stat - metadata structure to populate
799 v9fs_vfs_getattr(struct vfsmount
*mnt
, struct dentry
*dentry
,
802 struct v9fs_fcall
*fcall
= NULL
;
803 struct v9fs_session_info
*v9ses
= v9fs_inode2v9ses(dentry
->d_inode
);
804 struct v9fs_fid
*fid
= v9fs_fid_lookup(dentry
);
807 dprintk(DEBUG_VFS
, "dentry: %p\n", dentry
);
810 "couldn't find fid associated with dentry\n");
814 err
= v9fs_t_stat(v9ses
, fid
->fid
, &fcall
);
817 dprintk(DEBUG_ERROR
, "stat error\n");
819 v9fs_stat2inode(&fcall
->params
.rstat
.stat
, dentry
->d_inode
,
820 dentry
->d_inode
->i_sb
);
821 generic_fillattr(dentry
->d_inode
, stat
);
829 * v9fs_vfs_setattr - set file metadata
830 * @dentry: file whose metadata to set
831 * @iattr: metadata assignment structure
835 static int v9fs_vfs_setattr(struct dentry
*dentry
, struct iattr
*iattr
)
837 struct v9fs_session_info
*v9ses
= v9fs_inode2v9ses(dentry
->d_inode
);
838 struct v9fs_fid
*fid
= v9fs_fid_lookup(dentry
);
839 struct v9fs_fcall
*fcall
= NULL
;
840 struct v9fs_wstat wstat
;
843 dprintk(DEBUG_VFS
, "\n");
847 "Couldn't find fid associated with dentry\n");
851 v9fs_blank_wstat(&wstat
);
852 if (iattr
->ia_valid
& ATTR_MODE
)
853 wstat
.mode
= unixmode2p9mode(v9ses
, iattr
->ia_mode
);
855 if (iattr
->ia_valid
& ATTR_MTIME
)
856 wstat
.mtime
= iattr
->ia_mtime
.tv_sec
;
858 if (iattr
->ia_valid
& ATTR_ATIME
)
859 wstat
.atime
= iattr
->ia_atime
.tv_sec
;
861 if (iattr
->ia_valid
& ATTR_SIZE
)
862 wstat
.length
= iattr
->ia_size
;
864 if (v9ses
->extended
) {
865 if (iattr
->ia_valid
& ATTR_UID
)
866 wstat
.n_uid
= iattr
->ia_uid
;
868 if (iattr
->ia_valid
& ATTR_GID
)
869 wstat
.n_gid
= iattr
->ia_gid
;
872 res
= v9fs_t_wstat(v9ses
, fid
->fid
, &wstat
, &fcall
);
875 PRINT_FCALL_ERROR("wstat error", fcall
);
879 res
= inode_setattr(dentry
->d_inode
, iattr
);
885 * v9fs_stat2inode - populate an inode structure with mistat info
886 * @stat: Plan 9 metadata (mistat) structure
887 * @inode: inode to populate
888 * @sb: superblock of filesystem
893 v9fs_stat2inode(struct v9fs_stat
*stat
, struct inode
*inode
,
894 struct super_block
*sb
)
898 struct v9fs_session_info
*v9ses
= sb
->s_fs_info
;
902 inode
->i_atime
.tv_sec
= stat
->atime
;
903 inode
->i_mtime
.tv_sec
= stat
->mtime
;
904 inode
->i_ctime
.tv_sec
= stat
->mtime
;
906 inode
->i_uid
= v9ses
->uid
;
907 inode
->i_gid
= v9ses
->gid
;
909 if (v9ses
->extended
) {
910 inode
->i_uid
= stat
->n_uid
;
911 inode
->i_gid
= stat
->n_gid
;
914 inode
->i_mode
= p9mode2unixmode(v9ses
, stat
->mode
);
915 if ((S_ISBLK(inode
->i_mode
)) || (S_ISCHR(inode
->i_mode
))) {
920 n
= stat
->extension
.len
;
921 if (n
> sizeof(ext
)-1)
923 memmove(ext
, stat
->extension
.str
, n
);
925 sscanf(ext
, "%c %u %u", &type
, &major
, &minor
);
928 inode
->i_mode
&= ~S_IFBLK
;
929 inode
->i_mode
|= S_IFCHR
;
934 dprintk(DEBUG_ERROR
, "Unknown special type %c (%.*s)\n",
935 type
, stat
->extension
.len
, stat
->extension
.str
);
937 inode
->i_rdev
= MKDEV(major
, minor
);
941 inode
->i_size
= stat
->length
;
943 inode
->i_blksize
= sb
->s_blocksize
;
945 (inode
->i_size
+ inode
->i_blksize
- 1) >> sb
->s_blocksize_bits
;
949 * v9fs_qid2ino - convert qid into inode number
952 * BUG: potential for inode number collisions?
955 ino_t
v9fs_qid2ino(struct v9fs_qid
*qid
)
957 u64 path
= qid
->path
+ 2;
960 if (sizeof(ino_t
) == sizeof(path
))
961 memcpy(&i
, &path
, sizeof(ino_t
));
963 i
= (ino_t
) (path
^ (path
>> 32));
969 * v9fs_readlink - read a symlink's location (internal version)
970 * @dentry: dentry for symlink
971 * @buffer: buffer to load symlink location into
972 * @buflen: length of buffer
976 static int v9fs_readlink(struct dentry
*dentry
, char *buffer
, int buflen
)
980 struct v9fs_fcall
*fcall
= NULL
;
981 struct v9fs_session_info
*v9ses
= v9fs_inode2v9ses(dentry
->d_inode
);
982 struct v9fs_fid
*fid
= v9fs_fid_lookup(dentry
);
985 dprintk(DEBUG_ERROR
, "could not resolve fid from dentry\n");
990 if (!v9ses
->extended
) {
992 dprintk(DEBUG_ERROR
, "not extended\n");
996 dprintk(DEBUG_VFS
, " %s\n", dentry
->d_name
.name
);
997 retval
= v9fs_t_stat(v9ses
, fid
->fid
, &fcall
);
1000 dprintk(DEBUG_ERROR
, "stat error\n");
1007 if (!(fcall
->params
.rstat
.stat
.mode
& V9FS_DMSYMLINK
)) {
1012 /* copy extension buffer into buffer */
1013 if (fcall
->params
.rstat
.stat
.extension
.len
< buflen
)
1014 buflen
= fcall
->params
.rstat
.stat
.extension
.len
+ 1;
1016 memmove(buffer
, fcall
->params
.rstat
.stat
.extension
.str
, buflen
- 1);
1017 buffer
[buflen
-1] = 0;
1019 dprintk(DEBUG_ERROR
, "%s -> %.*s (%s)\n", dentry
->d_name
.name
, fcall
->params
.rstat
.stat
.extension
.len
,
1020 fcall
->params
.rstat
.stat
.extension
.str
, buffer
);
1030 * v9fs_vfs_readlink - read a symlink's location
1031 * @dentry: dentry for symlink
1032 * @buf: buffer to load symlink location into
1033 * @buflen: length of buffer
1037 static int v9fs_vfs_readlink(struct dentry
*dentry
, char __user
* buffer
,
1042 char *link
= __getname();
1044 if (buflen
> PATH_MAX
)
1047 dprintk(DEBUG_VFS
, " dentry: %s (%p)\n", dentry
->d_iname
, dentry
);
1049 retval
= v9fs_readlink(dentry
, link
, buflen
);
1052 if ((ret
= copy_to_user(buffer
, link
, retval
)) != 0) {
1053 dprintk(DEBUG_ERROR
, "problem copying to user: %d\n",
1064 * v9fs_vfs_follow_link - follow a symlink path
1065 * @dentry: dentry for symlink
1070 static void *v9fs_vfs_follow_link(struct dentry
*dentry
, struct nameidata
*nd
)
1073 char *link
= __getname();
1075 dprintk(DEBUG_VFS
, "%s n", dentry
->d_name
.name
);
1078 link
= ERR_PTR(-ENOMEM
);
1080 len
= v9fs_readlink(dentry
, link
, PATH_MAX
);
1084 link
= ERR_PTR(len
);
1088 nd_set_link(nd
, link
);
1094 * v9fs_vfs_put_link - release a symlink path
1095 * @dentry: dentry for symlink
1100 static void v9fs_vfs_put_link(struct dentry
*dentry
, struct nameidata
*nd
, void *p
)
1102 char *s
= nd_get_link(nd
);
1104 dprintk(DEBUG_VFS
, " %s %s\n", dentry
->d_name
.name
, s
);
1109 static int v9fs_vfs_mkspecial(struct inode
*dir
, struct dentry
*dentry
,
1110 int mode
, const char *extension
)
1114 struct v9fs_session_info
*v9ses
;
1115 struct v9fs_fid
*dfid
, *vfid
;
1116 struct inode
*inode
;
1120 v9ses
= v9fs_inode2v9ses(dir
);
1121 dfid
= v9fs_fid_lookup(dentry
->d_parent
);
1122 perm
= unixmode2p9mode(v9ses
, mode
);
1124 if (!v9ses
->extended
) {
1125 dprintk(DEBUG_ERROR
, "not extended\n");
1129 err
= v9fs_create(v9ses
, dfid
->fid
, (char *) dentry
->d_name
.name
,
1130 perm
, V9FS_OREAD
, (char *) extension
, &fid
, NULL
, NULL
);
1135 err
= v9fs_t_clunk(v9ses
, fid
);
1139 vfid
= v9fs_clone_walk(v9ses
, dfid
->fid
, dentry
);
1141 err
= PTR_ERR(vfid
);
1146 inode
= v9fs_inode_from_fid(v9ses
, vfid
->fid
, dir
->i_sb
);
1147 if (IS_ERR(inode
)) {
1148 err
= PTR_ERR(inode
);
1153 dentry
->d_op
= &v9fs_dentry_operations
;
1154 d_instantiate(dentry
, inode
);
1159 v9fs_fid_destroy(vfid
);
1169 * v9fs_vfs_symlink - helper function to create symlinks
1170 * @dir: directory inode containing symlink
1171 * @dentry: dentry for symlink
1172 * @symname: symlink data
1174 * See 9P2000.u RFC for more information
1179 v9fs_vfs_symlink(struct inode
*dir
, struct dentry
*dentry
, const char *symname
)
1181 dprintk(DEBUG_VFS
, " %lu,%s,%s\n", dir
->i_ino
, dentry
->d_name
.name
,
1184 return v9fs_vfs_mkspecial(dir
, dentry
, S_IFLNK
, symname
);
1188 * v9fs_vfs_link - create a hardlink
1189 * @old_dentry: dentry for file to link to
1190 * @dir: inode destination for new link
1191 * @dentry: dentry for link
1195 /* XXX - lots of code dup'd from symlink and creates,
1196 * figure out a better reuse strategy
1200 v9fs_vfs_link(struct dentry
*old_dentry
, struct inode
*dir
,
1201 struct dentry
*dentry
)
1204 struct v9fs_fid
*oldfid
;
1207 dprintk(DEBUG_VFS
, " %lu,%s,%s\n", dir
->i_ino
, dentry
->d_name
.name
,
1208 old_dentry
->d_name
.name
);
1210 oldfid
= v9fs_fid_lookup(old_dentry
);
1212 dprintk(DEBUG_ERROR
, "can't find oldfid\n");
1217 sprintf(name
, "%d\n", oldfid
->fid
);
1218 retval
= v9fs_vfs_mkspecial(dir
, dentry
, V9FS_DMLINK
, name
);
1225 * v9fs_vfs_mknod - create a special file
1226 * @dir: inode destination for new link
1227 * @dentry: dentry for file
1228 * @mode: mode for creation
1229 * @dev_t: device associated with special file
1234 v9fs_vfs_mknod(struct inode
*dir
, struct dentry
*dentry
, int mode
, dev_t rdev
)
1239 dprintk(DEBUG_VFS
, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir
->i_ino
,
1240 dentry
->d_name
.name
, mode
, MAJOR(rdev
), MINOR(rdev
));
1242 if (!new_valid_dev(rdev
))
1248 /* build extension */
1250 sprintf(name
, "b %u %u", MAJOR(rdev
), MINOR(rdev
));
1251 else if (S_ISCHR(mode
))
1252 sprintf(name
, "c %u %u", MAJOR(rdev
), MINOR(rdev
));
1253 else if (S_ISFIFO(mode
))
1260 retval
= v9fs_vfs_mkspecial(dir
, dentry
, mode
, name
);
1266 static struct inode_operations v9fs_dir_inode_operations_ext
= {
1267 .create
= v9fs_vfs_create
,
1268 .lookup
= v9fs_vfs_lookup
,
1269 .symlink
= v9fs_vfs_symlink
,
1270 .link
= v9fs_vfs_link
,
1271 .unlink
= v9fs_vfs_unlink
,
1272 .mkdir
= v9fs_vfs_mkdir
,
1273 .rmdir
= v9fs_vfs_rmdir
,
1274 .mknod
= v9fs_vfs_mknod
,
1275 .rename
= v9fs_vfs_rename
,
1276 .readlink
= v9fs_vfs_readlink
,
1277 .getattr
= v9fs_vfs_getattr
,
1278 .setattr
= v9fs_vfs_setattr
,
1281 static struct inode_operations v9fs_dir_inode_operations
= {
1282 .create
= v9fs_vfs_create
,
1283 .lookup
= v9fs_vfs_lookup
,
1284 .unlink
= v9fs_vfs_unlink
,
1285 .mkdir
= v9fs_vfs_mkdir
,
1286 .rmdir
= v9fs_vfs_rmdir
,
1287 .mknod
= v9fs_vfs_mknod
,
1288 .rename
= v9fs_vfs_rename
,
1289 .getattr
= v9fs_vfs_getattr
,
1290 .setattr
= v9fs_vfs_setattr
,
1293 static struct inode_operations v9fs_file_inode_operations
= {
1294 .getattr
= v9fs_vfs_getattr
,
1295 .setattr
= v9fs_vfs_setattr
,
1298 static struct inode_operations v9fs_symlink_inode_operations
= {
1299 .readlink
= v9fs_vfs_readlink
,
1300 .follow_link
= v9fs_vfs_follow_link
,
1301 .put_link
= v9fs_vfs_put_link
,
1302 .getattr
= v9fs_vfs_getattr
,
1303 .setattr
= v9fs_vfs_setattr
,