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 as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to:
21 * Free Software Foundation
22 * 51 Franklin Street, Fifth Floor
23 * Boston, MA 02111-1301 USA
27 #include <linux/module.h>
28 #include <linux/errno.h>
30 #include <linux/file.h>
31 #include <linux/pagemap.h>
32 #include <linux/stat.h>
33 #include <linux/string.h>
34 #include <linux/smp_lock.h>
35 #include <linux/inet.h>
36 #include <linux/namei.h>
37 #include <linux/idr.h>
46 static struct inode_operations v9fs_dir_inode_operations;
47 static struct inode_operations v9fs_dir_inode_operations_ext;
48 static struct inode_operations v9fs_file_inode_operations;
49 static struct inode_operations v9fs_symlink_inode_operations;
52 * unixmode2p9mode - convert unix mode bits to plan 9
53 * @v9ses: v9fs session information
54 * @mode: mode to convert
58 static int unixmode2p9mode(struct v9fs_session_info *v9ses, int mode)
64 if (v9ses->extended) {
66 res |= V9FS_DMSYMLINK;
67 if (v9ses->nodev == 0) {
71 res |= V9FS_DMNAMEDPIPE;
78 if ((mode & S_ISUID) == S_ISUID)
80 if ((mode & S_ISGID) == S_ISGID)
82 if ((mode & V9FS_DMLINK))
90 * p9mode2unixmode- convert plan9 mode bits to unix mode bits
91 * @v9ses: v9fs session information
92 * @mode: mode to convert
96 static int p9mode2unixmode(struct v9fs_session_info *v9ses, int mode)
102 if ((mode & V9FS_DMDIR) == V9FS_DMDIR)
104 else if ((mode & V9FS_DMSYMLINK) && (v9ses->extended))
106 else if ((mode & V9FS_DMSOCKET) && (v9ses->extended)
107 && (v9ses->nodev == 0))
109 else if ((mode & V9FS_DMNAMEDPIPE) && (v9ses->extended)
110 && (v9ses->nodev == 0))
112 else if ((mode & V9FS_DMDEVICE) && (v9ses->extended)
113 && (v9ses->nodev == 0))
118 if (v9ses->extended) {
119 if ((mode & V9FS_DMSETUID) == V9FS_DMSETUID)
122 if ((mode & V9FS_DMSETGID) == V9FS_DMSETGID)
130 * v9fs_blank_mistat - helper function to setup a 9P stat structure
131 * @v9ses: 9P session info (for determining extended mode)
132 * @mistat: structure to initialize
137 v9fs_blank_mistat(struct v9fs_session_info *v9ses, struct v9fs_stat *mistat)
141 mistat->qid.type = ~0;
142 mistat->qid.version = ~0;
143 *((long long *)&mistat->qid.path) = ~0;
148 mistat->name = mistat->data;
149 mistat->uid = mistat->data;
150 mistat->gid = mistat->data;
151 mistat->muid = mistat->data;
152 if (v9ses->extended) {
156 mistat->extension = mistat->data;
162 * v9fs_mistat2unix - convert mistat to unix stat
163 * @mistat: Plan 9 metadata (mistat) structure
164 * @buf: unix metadata (stat) structure to populate
170 v9fs_mistat2unix(struct v9fs_stat *mistat, struct stat *buf,
171 struct super_block *sb)
173 struct v9fs_session_info *v9ses = sb ? sb->s_fs_info : NULL;
177 buf->st_atime = mistat->atime;
178 buf->st_mtime = mistat->mtime;
179 buf->st_ctime = mistat->mtime;
181 buf->st_uid = (unsigned short)-1;
182 buf->st_gid = (unsigned short)-1;
184 if (v9ses && v9ses->extended) {
185 /* TODO: string to uid mapping via user-space daemon */
186 if (mistat->n_uid != -1)
187 sscanf(mistat->uid, "%x", (unsigned int *)&buf->st_uid);
189 if (mistat->n_gid != -1)
190 sscanf(mistat->gid, "%x", (unsigned int *)&buf->st_gid);
193 if (buf->st_uid == (unsigned short)-1)
194 buf->st_uid = v9ses->uid;
195 if (buf->st_gid == (unsigned short)-1)
196 buf->st_gid = v9ses->gid;
198 buf->st_mode = p9mode2unixmode(v9ses, mistat->mode);
199 if ((S_ISBLK(buf->st_mode)) || (S_ISCHR(buf->st_mode))) {
203 sscanf(mistat->extension, "%c %u %u", &type, &major, &minor);
206 buf->st_mode &= ~S_IFBLK;
207 buf->st_mode |= S_IFCHR;
212 dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n",
213 type, mistat->extension);
215 buf->st_rdev = MKDEV(major, minor);
219 buf->st_size = mistat->length;
221 buf->st_blksize = sb->s_blocksize;
223 (buf->st_size + buf->st_blksize - 1) >> sb->s_blocksize_bits;
227 * v9fs_get_inode - helper function to setup an inode
229 * @mode: mode to setup inode with
233 struct inode *v9fs_get_inode(struct super_block *sb, int mode)
235 struct inode *inode = NULL;
236 struct v9fs_session_info *v9ses = sb->s_fs_info;
238 dprintk(DEBUG_VFS, "super block: %p mode: %o\n", sb, mode);
240 inode = new_inode(sb);
242 inode->i_mode = mode;
243 inode->i_uid = current->fsuid;
244 inode->i_gid = current->fsgid;
245 inode->i_blksize = sb->s_blocksize;
248 inode->i_atime = inode->i_mtime = inode->i_ctime = CURRENT_TIME;
250 switch (mode & S_IFMT) {
255 if(!v9ses->extended) {
256 dprintk(DEBUG_ERROR, "special files without extended mode\n");
257 return ERR_PTR(-EINVAL);
259 init_special_inode(inode, inode->i_mode,
263 inode->i_op = &v9fs_file_inode_operations;
264 inode->i_fop = &v9fs_file_operations;
267 if(!v9ses->extended) {
268 dprintk(DEBUG_ERROR, "extended modes used w/o 9P2000.u\n");
269 return ERR_PTR(-EINVAL);
271 inode->i_op = &v9fs_symlink_inode_operations;
276 inode->i_op = &v9fs_dir_inode_operations_ext;
278 inode->i_op = &v9fs_dir_inode_operations;
279 inode->i_fop = &v9fs_dir_operations;
282 dprintk(DEBUG_ERROR, "BAD mode 0x%x S_IFMT 0x%x\n",
283 mode, mode & S_IFMT);
284 return ERR_PTR(-EINVAL);
287 eprintk(KERN_WARNING, "Problem allocating inode\n");
288 return ERR_PTR(-ENOMEM);
294 * v9fs_create - helper function to create files and directories
295 * @dir: directory inode file is being created in
296 * @file_dentry: dentry file is being created in
297 * @perm: permissions file is being created with
298 * @open_mode: resulting open mode for file
303 v9fs_create(struct inode *dir,
304 struct dentry *file_dentry,
305 unsigned int perm, unsigned int open_mode)
307 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
308 struct super_block *sb = dir->i_sb;
309 struct v9fs_fid *dirfid =
310 v9fs_fid_lookup(file_dentry->d_parent);
311 struct v9fs_fid *fid = NULL;
312 struct inode *file_inode = NULL;
313 struct v9fs_fcall *fcall = NULL;
319 unsigned int iounit = 0;
322 perm = unixmode2p9mode(v9ses, perm);
324 dprintk(DEBUG_VFS, "dir: %p dentry: %p perm: %o mode: %o\n", dir,
325 file_dentry, perm, open_mode);
330 dirfidnum = dirfid->fid;
332 dprintk(DEBUG_ERROR, "No fid for the directory #%lu\n",
337 if (file_dentry->d_inode) {
339 "Odd. There is an inode for dir %lu, name :%s:\n",
340 dir->i_ino, file_dentry->d_name.name);
344 newfid = v9fs_get_idpool(&v9ses->fidpool);
346 eprintk(KERN_WARNING, "no free fids available\n");
350 result = v9fs_t_walk(v9ses, dirfidnum, newfid, NULL, &fcall);
352 dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall));
353 v9fs_put_idpool(newfid, &v9ses->fidpool);
360 result = v9fs_t_create(v9ses, newfid, (char *)file_dentry->d_name.name,
361 perm, open_mode, &fcall);
363 dprintk(DEBUG_ERROR, "create fails: %s(%d)\n",
364 FCALL_ERROR(fcall), result);
369 iounit = fcall->params.rcreate.iounit;
370 qid = fcall->params.rcreate.qid;
373 fid = v9fs_fid_create(file_dentry, v9ses, newfid, 1);
374 dprintk(DEBUG_VFS, "fid %p %d\n", fid, fid->fidcreate);
381 fid->iounit = iounit;
383 /* walk to the newly created file and put the fid in the dentry */
384 wfidno = v9fs_get_idpool(&v9ses->fidpool);
386 eprintk(KERN_WARNING, "no free fids available\n");
390 result = v9fs_t_walk(v9ses, dirfidnum, wfidno,
391 (char *) file_dentry->d_name.name, NULL);
393 dprintk(DEBUG_ERROR, "clone error: %s\n", FCALL_ERROR(fcall));
394 v9fs_put_idpool(wfidno, &v9ses->fidpool);
399 if (!v9fs_fid_create(file_dentry, v9ses, wfidno, 0)) {
400 if (!v9fs_t_clunk(v9ses, newfid, &fcall)) {
401 v9fs_put_idpool(wfidno, &v9ses->fidpool);
407 if ((perm & V9FS_DMSYMLINK) || (perm & V9FS_DMLINK) ||
408 (perm & V9FS_DMNAMEDPIPE) || (perm & V9FS_DMSOCKET) ||
409 (perm & V9FS_DMDEVICE))
412 result = v9fs_t_stat(v9ses, newfid, &fcall);
414 dprintk(DEBUG_ERROR, "stat error: %s(%d)\n", FCALL_ERROR(fcall),
419 v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb);
421 file_inode = v9fs_get_inode(sb, newstat.st_mode);
422 if ((!file_inode) || IS_ERR(file_inode)) {
423 dprintk(DEBUG_ERROR, "create inode failed\n");
428 v9fs_mistat2inode(fcall->params.rstat.stat, file_inode, sb);
430 d_instantiate(file_dentry, file_inode);
432 if (perm & V9FS_DMDIR) {
433 if (!v9fs_t_clunk(v9ses, newfid, &fcall))
434 v9fs_put_idpool(newfid, &v9ses->fidpool);
436 dprintk(DEBUG_ERROR, "clunk for mkdir failed: %s\n",
450 if (!v9fs_t_clunk(v9ses, newfid, &fcall))
451 v9fs_put_idpool(newfid, &v9ses->fidpool);
453 dprintk(DEBUG_ERROR, "clunk failed: %s\n",
459 if (!v9fs_t_clunk(v9ses, wfidno, &fcall))
460 v9fs_put_idpool(wfidno, &v9ses->fidpool);
462 dprintk(DEBUG_ERROR, "clunk failed: %s\n",
471 * v9fs_remove - helper function to remove files and directories
472 * @dir: directory inode that is being deleted
473 * @file: dentry that is being deleted
474 * @rmdir: removing a directory
478 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
480 struct v9fs_fcall *fcall = NULL;
481 struct super_block *sb = NULL;
482 struct v9fs_session_info *v9ses = NULL;
483 struct v9fs_fid *v9fid = NULL;
484 struct inode *file_inode = NULL;
488 dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
491 file_inode = file->d_inode;
492 sb = file_inode->i_sb;
493 v9ses = v9fs_inode2v9ses(file_inode);
494 v9fid = v9fs_fid_lookup(file);
504 dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n",
509 result = v9fs_t_remove(v9ses, fid, &fcall);
511 dprintk(DEBUG_ERROR, "remove of file fails: %s(%d)\n",
512 FCALL_ERROR(fcall), result);
514 v9fs_put_idpool(fid, &v9ses->fidpool);
515 v9fs_fid_destroy(v9fid);
523 * v9fs_vfs_create - VFS hook to create files
524 * @inode: directory inode that is being deleted
525 * @dentry: dentry that is being deleted
526 * @perm: create permissions
527 * @nd: path information
532 v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm,
533 struct nameidata *nd)
535 return v9fs_create(inode, dentry, perm, O_RDWR);
539 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
540 * @inode: inode that is being unlinked
541 * @dentry: dentry that is being unlinked
542 * @mode: mode for new directory
546 static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode)
548 return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY);
552 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
553 * @dir: inode that is being walked from
554 * @dentry: dentry that is being walked to?
555 * @nameidata: path data
559 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
560 struct nameidata *nameidata)
562 struct super_block *sb;
563 struct v9fs_session_info *v9ses;
564 struct v9fs_fid *dirfid;
565 struct v9fs_fid *fid;
567 struct v9fs_fcall *fcall = NULL;
573 dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
574 dir, dentry->d_iname, dentry, nameidata);
577 v9ses = v9fs_inode2v9ses(dir);
578 dirfid = v9fs_fid_lookup(dentry->d_parent);
581 dprintk(DEBUG_ERROR, "no dirfid\n");
582 return ERR_PTR(-EINVAL);
585 dirfidnum = dirfid->fid;
588 dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n",
590 return ERR_PTR(-EBADF);
593 newfid = v9fs_get_idpool(&v9ses->fidpool);
595 eprintk(KERN_WARNING, "newfid fails!\n");
596 return ERR_PTR(-ENOSPC);
600 v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name,
603 v9fs_put_idpool(newfid, &v9ses->fidpool);
604 if (result == -ENOENT) {
607 "Return negative dentry %p count %d\n",
608 dentry, atomic_read(&dentry->d_count));
611 dprintk(DEBUG_ERROR, "walk error:%d\n", result);
615 result = v9fs_t_stat(v9ses, newfid, &fcall);
617 dprintk(DEBUG_ERROR, "stat error\n");
621 v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb);
622 inode = v9fs_get_inode(sb, newstat.st_mode);
624 if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) {
625 eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n",
632 inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat->qid);
634 fid = v9fs_fid_create(dentry, v9ses, newfid, 0);
636 dprintk(DEBUG_ERROR, "couldn't insert\n");
641 fid->qid = fcall->params.rstat.stat->qid;
643 dentry->d_op = &v9fs_dentry_operations;
644 v9fs_mistat2inode(fcall->params.rstat.stat, inode, inode->i_sb);
646 d_add(dentry, inode);
653 return ERR_PTR(result);
657 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
658 * @i: inode that is being unlinked
659 * @d: dentry that is being unlinked
663 static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
665 return v9fs_remove(i, d, 0);
669 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
670 * @i: inode that is being unlinked
671 * @d: dentry that is being unlinked
675 static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
677 return v9fs_remove(i, d, 1);
681 * v9fs_vfs_rename - VFS hook to rename an inode
682 * @old_dir: old dir inode
683 * @old_dentry: old dentry
684 * @new_dir: new dir inode
685 * @new_dentry: new dentry
690 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
691 struct inode *new_dir, struct dentry *new_dentry)
693 struct inode *old_inode = old_dentry->d_inode;
694 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode);
695 struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
696 struct v9fs_fid *olddirfid =
697 v9fs_fid_lookup(old_dentry->d_parent);
698 struct v9fs_fid *newdirfid =
699 v9fs_fid_lookup(new_dentry->d_parent);
700 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
701 struct v9fs_fcall *fcall = NULL;
703 int olddirfidnum = -1;
704 int newdirfidnum = -1;
707 dprintk(DEBUG_VFS, "\n");
712 if ((!oldfid) || (!olddirfid) || (!newdirfid)) {
713 dprintk(DEBUG_ERROR, "problem with arguments\n");
717 /* 9P can only handle file rename in the same directory */
718 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
719 dprintk(DEBUG_ERROR, "old dir and new dir are different\n");
725 olddirfidnum = olddirfid->fid;
726 newdirfidnum = newdirfid->fid;
729 dprintk(DEBUG_ERROR, "no fid for old file #%lu\n",
735 v9fs_blank_mistat(v9ses, mistat);
737 strcpy(mistat->data + 1, v9ses->name);
738 mistat->name = mistat->data + 1 + strlen(v9ses->name);
740 if (new_dentry->d_name.len >
741 (v9ses->maxdata - strlen(v9ses->name) - sizeof(struct v9fs_stat))) {
742 dprintk(DEBUG_ERROR, "new name too long\n");
746 strcpy(mistat->name, new_dentry->d_name.name);
747 retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall);
753 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
761 * v9fs_vfs_getattr - retreive file metadata
762 * @mnt - mount information
763 * @dentry - file to get attributes on
764 * @stat - metadata structure to populate
769 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
772 struct v9fs_fcall *fcall = NULL;
773 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
774 struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
777 dprintk(DEBUG_VFS, "dentry: %p\n", dentry);
780 "couldn't find fid associated with dentry\n");
784 err = v9fs_t_stat(v9ses, fid->fid, &fcall);
787 dprintk(DEBUG_ERROR, "stat error\n");
789 v9fs_mistat2inode(fcall->params.rstat.stat, dentry->d_inode,
790 dentry->d_inode->i_sb);
791 generic_fillattr(dentry->d_inode, stat);
799 * v9fs_vfs_setattr - set file metadata
800 * @dentry: file whose metadata to set
801 * @iattr: metadata assignment structure
805 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
807 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
808 struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
809 struct v9fs_fcall *fcall = NULL;
810 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
813 dprintk(DEBUG_VFS, "\n");
820 "Couldn't find fid associated with dentry\n");
824 v9fs_blank_mistat(v9ses, mistat);
825 if (iattr->ia_valid & ATTR_MODE)
826 mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode);
828 if (iattr->ia_valid & ATTR_MTIME)
829 mistat->mtime = iattr->ia_mtime.tv_sec;
831 if (iattr->ia_valid & ATTR_ATIME)
832 mistat->atime = iattr->ia_atime.tv_sec;
834 if (iattr->ia_valid & ATTR_SIZE)
835 mistat->length = iattr->ia_size;
837 if (v9ses->extended) {
838 char *ptr = mistat->data+1;
840 if (iattr->ia_valid & ATTR_UID) {
842 ptr += 1+sprintf(ptr, "%08x", iattr->ia_uid);
843 mistat->n_uid = iattr->ia_uid;
846 if (iattr->ia_valid & ATTR_GID) {
848 ptr += 1+sprintf(ptr, "%08x", iattr->ia_gid);
849 mistat->n_gid = iattr->ia_gid;
853 res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall);
856 dprintk(DEBUG_ERROR, "wstat error: %s\n", FCALL_ERROR(fcall));
862 res = inode_setattr(dentry->d_inode, iattr);
868 * v9fs_mistat2inode - populate an inode structure with mistat info
869 * @mistat: Plan 9 metadata (mistat) structure
870 * @inode: inode to populate
871 * @sb: superblock of filesystem
876 v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode,
877 struct super_block *sb)
879 struct v9fs_session_info *v9ses = sb->s_fs_info;
883 inode->i_atime.tv_sec = mistat->atime;
884 inode->i_mtime.tv_sec = mistat->mtime;
885 inode->i_ctime.tv_sec = mistat->mtime;
890 if (v9ses->extended) {
891 /* TODO: string to uid mapping via user-space daemon */
892 inode->i_uid = mistat->n_uid;
893 inode->i_gid = mistat->n_gid;
895 if (mistat->n_uid == -1)
896 sscanf(mistat->uid, "%x", &inode->i_uid);
898 if (mistat->n_gid == -1)
899 sscanf(mistat->gid, "%x", &inode->i_gid);
902 if (inode->i_uid == -1)
903 inode->i_uid = v9ses->uid;
904 if (inode->i_gid == -1)
905 inode->i_gid = v9ses->gid;
907 inode->i_mode = p9mode2unixmode(v9ses, mistat->mode);
908 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
912 sscanf(mistat->extension, "%c %u %u", &type, &major, &minor);
915 inode->i_mode &= ~S_IFBLK;
916 inode->i_mode |= S_IFCHR;
921 dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n",
922 type, mistat->extension);
924 inode->i_rdev = MKDEV(major, minor);
928 inode->i_size = mistat->length;
930 inode->i_blksize = sb->s_blocksize;
932 (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits;
936 * v9fs_qid2ino - convert qid into inode number
939 * BUG: potential for inode number collisions?
942 ino_t v9fs_qid2ino(struct v9fs_qid *qid)
944 u64 path = qid->path + 2;
947 if (sizeof(ino_t) == sizeof(path))
948 memcpy(&i, &path, sizeof(ino_t));
950 i = (ino_t) (path ^ (path >> 32));
956 * v9fs_vfs_symlink - helper function to create symlinks
957 * @dir: directory inode containing symlink
958 * @dentry: dentry for symlink
959 * @symname: symlink data
961 * See 9P2000.u RFC for more information
966 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
969 struct v9fs_fid *newfid;
970 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
971 struct v9fs_fcall *fcall = NULL;
972 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
974 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
980 if (!v9ses->extended) {
981 dprintk(DEBUG_ERROR, "not extended\n");
986 retval = v9fs_create(dir, dentry, S_IFLNK, 0);
990 newfid = v9fs_fid_lookup(dentry);
993 v9fs_blank_mistat(v9ses, mistat);
994 strcpy(mistat->data + 1, symname);
995 mistat->extension = mistat->data + 1;
996 retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
998 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
1005 if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
1006 dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
1007 FCALL_ERROR(fcall));
1011 d_drop(dentry); /* FID - will this also clunk? */
1021 * v9fs_readlink - read a symlink's location (internal version)
1022 * @dentry: dentry for symlink
1023 * @buffer: buffer to load symlink location into
1024 * @buflen: length of buffer
1028 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1030 int retval = -EPERM;
1032 struct v9fs_fcall *fcall = NULL;
1033 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
1034 struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
1037 dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n");
1042 if (!v9ses->extended) {
1044 dprintk(DEBUG_ERROR, "not extended\n");
1048 dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name);
1049 retval = v9fs_t_stat(v9ses, fid->fid, &fcall);
1052 dprintk(DEBUG_ERROR, "stat error\n");
1059 if (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) {
1064 /* copy extension buffer into buffer */
1065 if (strlen(fcall->params.rstat.stat->extension) < buflen)
1066 buflen = strlen(fcall->params.rstat.stat->extension);
1068 memcpy(buffer, fcall->params.rstat.stat->extension, buflen + 1);
1079 * v9fs_vfs_readlink - read a symlink's location
1080 * @dentry: dentry for symlink
1081 * @buf: buffer to load symlink location into
1082 * @buflen: length of buffer
1086 static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
1091 char *link = __getname();
1093 if (buflen > PATH_MAX)
1096 dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
1098 retval = v9fs_readlink(dentry, link, buflen);
1101 if ((ret = copy_to_user(buffer, link, retval)) != 0) {
1102 dprintk(DEBUG_ERROR, "problem copying to user: %d\n",
1113 * v9fs_vfs_follow_link - follow a symlink path
1114 * @dentry: dentry for symlink
1119 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1122 char *link = __getname();
1124 dprintk(DEBUG_VFS, "%s n", dentry->d_name.name);
1127 link = ERR_PTR(-ENOMEM);
1129 len = v9fs_readlink(dentry, link, strlen(link));
1133 link = ERR_PTR(len);
1137 nd_set_link(nd, link);
1143 * v9fs_vfs_put_link - release a symlink path
1144 * @dentry: dentry for symlink
1149 static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1151 char *s = nd_get_link(nd);
1153 dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s);
1159 * v9fs_vfs_link - create a hardlink
1160 * @old_dentry: dentry for file to link to
1161 * @dir: inode destination for new link
1162 * @dentry: dentry for link
1166 /* XXX - lots of code dup'd from symlink and creates,
1167 * figure out a better reuse strategy
1171 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1172 struct dentry *dentry)
1174 int retval = -EPERM;
1175 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1176 struct v9fs_fcall *fcall = NULL;
1177 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
1178 struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
1179 struct v9fs_fid *newfid = NULL;
1180 char *symname = __getname();
1182 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1183 old_dentry->d_name.name);
1185 if (!v9ses->extended) {
1186 dprintk(DEBUG_ERROR, "not extended\n");
1190 /* get fid of old_dentry */
1191 sprintf(symname, "hardlink(%d)\n", oldfid->fid);
1193 /* issue a create */
1194 retval = v9fs_create(dir, dentry, V9FS_DMLINK, 0);
1198 newfid = v9fs_fid_lookup(dentry);
1200 dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n");
1204 /* issue a twstat */
1205 v9fs_blank_mistat(v9ses, mistat);
1206 strcpy(mistat->data + 1, symname);
1207 mistat->extension = mistat->data + 1;
1208 retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
1210 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
1211 FCALL_ERROR(fcall));
1217 if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
1218 dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
1219 FCALL_ERROR(fcall));
1223 d_drop(dentry); /* FID - will this also clunk? */
1236 * v9fs_vfs_mknod - create a special file
1237 * @dir: inode destination for new link
1238 * @dentry: dentry for file
1239 * @mode: mode for creation
1240 * @dev_t: device associated with special file
1245 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1247 int retval = -EPERM;
1248 struct v9fs_fid *newfid;
1249 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1250 struct v9fs_fcall *fcall = NULL;
1251 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
1252 char *symname = __getname();
1254 dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1255 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1260 if (!new_valid_dev(rdev)) {
1265 if (!v9ses->extended) {
1266 dprintk(DEBUG_ERROR, "not extended\n");
1270 /* issue a create */
1271 retval = v9fs_create(dir, dentry, mode, 0);
1276 newfid = v9fs_fid_lookup(dentry);
1278 dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n");
1283 /* build extension */
1285 sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev));
1286 else if (S_ISCHR(mode))
1287 sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev));
1288 else if (S_ISFIFO(mode))
1295 if (!S_ISFIFO(mode)) {
1296 /* issue a twstat */
1297 v9fs_blank_mistat(v9ses, mistat);
1298 strcpy(mistat->data + 1, symname);
1299 mistat->extension = mistat->data + 1;
1300 retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
1302 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
1303 FCALL_ERROR(fcall));
1308 /* need to update dcache so we show up */
1311 if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
1312 dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
1313 FCALL_ERROR(fcall));
1317 d_drop(dentry); /* FID - will this also clunk? */
1327 static struct inode_operations v9fs_dir_inode_operations_ext = {
1328 .create = v9fs_vfs_create,
1329 .lookup = v9fs_vfs_lookup,
1330 .symlink = v9fs_vfs_symlink,
1331 .link = v9fs_vfs_link,
1332 .unlink = v9fs_vfs_unlink,
1333 .mkdir = v9fs_vfs_mkdir,
1334 .rmdir = v9fs_vfs_rmdir,
1335 .mknod = v9fs_vfs_mknod,
1336 .rename = v9fs_vfs_rename,
1337 .readlink = v9fs_vfs_readlink,
1338 .getattr = v9fs_vfs_getattr,
1339 .setattr = v9fs_vfs_setattr,
1342 static struct inode_operations v9fs_dir_inode_operations = {
1343 .create = v9fs_vfs_create,
1344 .lookup = v9fs_vfs_lookup,
1345 .unlink = v9fs_vfs_unlink,
1346 .mkdir = v9fs_vfs_mkdir,
1347 .rmdir = v9fs_vfs_rmdir,
1348 .mknod = v9fs_vfs_mknod,
1349 .rename = v9fs_vfs_rename,
1350 .getattr = v9fs_vfs_getattr,
1351 .setattr = v9fs_vfs_setattr,
1354 static struct inode_operations v9fs_file_inode_operations = {
1355 .getattr = v9fs_vfs_getattr,
1356 .setattr = v9fs_vfs_setattr,
1359 static struct inode_operations v9fs_symlink_inode_operations = {
1360 .readlink = v9fs_vfs_readlink,
1361 .follow_link = v9fs_vfs_follow_link,
1362 .put_link = v9fs_vfs_put_link,
1363 .getattr = v9fs_vfs_getattr,
1364 .setattr = v9fs_vfs_setattr,