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);
431 file_dentry->d_op = &v9fs_dentry_operations;
432 d_instantiate(file_dentry, file_inode);
434 if (perm & V9FS_DMDIR) {
435 if (!v9fs_t_clunk(v9ses, newfid, &fcall))
436 v9fs_put_idpool(newfid, &v9ses->fidpool);
438 dprintk(DEBUG_ERROR, "clunk for mkdir failed: %s\n",
452 if (!v9fs_t_clunk(v9ses, newfid, &fcall))
453 v9fs_put_idpool(newfid, &v9ses->fidpool);
455 dprintk(DEBUG_ERROR, "clunk failed: %s\n",
461 if (!v9fs_t_clunk(v9ses, wfidno, &fcall))
462 v9fs_put_idpool(wfidno, &v9ses->fidpool);
464 dprintk(DEBUG_ERROR, "clunk failed: %s\n",
473 * v9fs_remove - helper function to remove files and directories
474 * @dir: directory inode that is being deleted
475 * @file: dentry that is being deleted
476 * @rmdir: removing a directory
480 static int v9fs_remove(struct inode *dir, struct dentry *file, int rmdir)
482 struct v9fs_fcall *fcall = NULL;
483 struct super_block *sb = NULL;
484 struct v9fs_session_info *v9ses = NULL;
485 struct v9fs_fid *v9fid = NULL;
486 struct inode *file_inode = NULL;
490 dprintk(DEBUG_VFS, "inode: %p dentry: %p rmdir: %d\n", dir, file,
493 file_inode = file->d_inode;
494 sb = file_inode->i_sb;
495 v9ses = v9fs_inode2v9ses(file_inode);
496 v9fid = v9fs_fid_lookup(file);
506 dprintk(DEBUG_ERROR, "inode #%lu, no fid!\n",
511 result = v9fs_t_remove(v9ses, fid, &fcall);
513 dprintk(DEBUG_ERROR, "remove of file fails: %s(%d)\n",
514 FCALL_ERROR(fcall), result);
516 v9fs_put_idpool(fid, &v9ses->fidpool);
517 v9fs_fid_destroy(v9fid);
525 * v9fs_vfs_create - VFS hook to create files
526 * @inode: directory inode that is being deleted
527 * @dentry: dentry that is being deleted
528 * @perm: create permissions
529 * @nd: path information
534 v9fs_vfs_create(struct inode *inode, struct dentry *dentry, int perm,
535 struct nameidata *nd)
537 return v9fs_create(inode, dentry, perm, O_RDWR);
541 * v9fs_vfs_mkdir - VFS mkdir hook to create a directory
542 * @inode: inode that is being unlinked
543 * @dentry: dentry that is being unlinked
544 * @mode: mode for new directory
548 static int v9fs_vfs_mkdir(struct inode *inode, struct dentry *dentry, int mode)
550 return v9fs_create(inode, dentry, mode | S_IFDIR, O_RDONLY);
554 * v9fs_vfs_lookup - VFS lookup hook to "walk" to a new inode
555 * @dir: inode that is being walked from
556 * @dentry: dentry that is being walked to?
557 * @nameidata: path data
561 static struct dentry *v9fs_vfs_lookup(struct inode *dir, struct dentry *dentry,
562 struct nameidata *nameidata)
564 struct super_block *sb;
565 struct v9fs_session_info *v9ses;
566 struct v9fs_fid *dirfid;
567 struct v9fs_fid *fid;
569 struct v9fs_fcall *fcall = NULL;
575 dprintk(DEBUG_VFS, "dir: %p dentry: (%s) %p nameidata: %p\n",
576 dir, dentry->d_iname, dentry, nameidata);
579 v9ses = v9fs_inode2v9ses(dir);
580 dirfid = v9fs_fid_lookup(dentry->d_parent);
583 dprintk(DEBUG_ERROR, "no dirfid\n");
584 return ERR_PTR(-EINVAL);
587 dirfidnum = dirfid->fid;
590 dprintk(DEBUG_ERROR, "no dirfid for inode %p, #%lu\n",
592 return ERR_PTR(-EBADF);
595 newfid = v9fs_get_idpool(&v9ses->fidpool);
597 eprintk(KERN_WARNING, "newfid fails!\n");
598 return ERR_PTR(-ENOSPC);
602 v9fs_t_walk(v9ses, dirfidnum, newfid, (char *)dentry->d_name.name,
605 v9fs_put_idpool(newfid, &v9ses->fidpool);
606 if (result == -ENOENT) {
609 "Return negative dentry %p count %d\n",
610 dentry, atomic_read(&dentry->d_count));
613 dprintk(DEBUG_ERROR, "walk error:%d\n", result);
617 result = v9fs_t_stat(v9ses, newfid, &fcall);
619 dprintk(DEBUG_ERROR, "stat error\n");
623 v9fs_mistat2unix(fcall->params.rstat.stat, &newstat, sb);
624 inode = v9fs_get_inode(sb, newstat.st_mode);
626 if (IS_ERR(inode) && (PTR_ERR(inode) == -ENOSPC)) {
627 eprintk(KERN_WARNING, "inode alloc failes, returns %ld\n",
634 inode->i_ino = v9fs_qid2ino(&fcall->params.rstat.stat->qid);
636 fid = v9fs_fid_create(dentry, v9ses, newfid, 0);
638 dprintk(DEBUG_ERROR, "couldn't insert\n");
643 fid->qid = fcall->params.rstat.stat->qid;
645 dentry->d_op = &v9fs_dentry_operations;
646 v9fs_mistat2inode(fcall->params.rstat.stat, inode, inode->i_sb);
648 d_add(dentry, inode);
655 return ERR_PTR(result);
659 * v9fs_vfs_unlink - VFS unlink hook to delete an inode
660 * @i: inode that is being unlinked
661 * @d: dentry that is being unlinked
665 static int v9fs_vfs_unlink(struct inode *i, struct dentry *d)
667 return v9fs_remove(i, d, 0);
671 * v9fs_vfs_rmdir - VFS unlink hook to delete a directory
672 * @i: inode that is being unlinked
673 * @d: dentry that is being unlinked
677 static int v9fs_vfs_rmdir(struct inode *i, struct dentry *d)
679 return v9fs_remove(i, d, 1);
683 * v9fs_vfs_rename - VFS hook to rename an inode
684 * @old_dir: old dir inode
685 * @old_dentry: old dentry
686 * @new_dir: new dir inode
687 * @new_dentry: new dentry
692 v9fs_vfs_rename(struct inode *old_dir, struct dentry *old_dentry,
693 struct inode *new_dir, struct dentry *new_dentry)
695 struct inode *old_inode = old_dentry->d_inode;
696 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(old_inode);
697 struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
698 struct v9fs_fid *olddirfid =
699 v9fs_fid_lookup(old_dentry->d_parent);
700 struct v9fs_fid *newdirfid =
701 v9fs_fid_lookup(new_dentry->d_parent);
702 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
703 struct v9fs_fcall *fcall = NULL;
705 int olddirfidnum = -1;
706 int newdirfidnum = -1;
709 dprintk(DEBUG_VFS, "\n");
714 if ((!oldfid) || (!olddirfid) || (!newdirfid)) {
715 dprintk(DEBUG_ERROR, "problem with arguments\n");
719 /* 9P can only handle file rename in the same directory */
720 if (memcmp(&olddirfid->qid, &newdirfid->qid, sizeof(newdirfid->qid))) {
721 dprintk(DEBUG_ERROR, "old dir and new dir are different\n");
727 olddirfidnum = olddirfid->fid;
728 newdirfidnum = newdirfid->fid;
731 dprintk(DEBUG_ERROR, "no fid for old file #%lu\n",
737 v9fs_blank_mistat(v9ses, mistat);
739 strcpy(mistat->data + 1, v9ses->name);
740 mistat->name = mistat->data + 1 + strlen(v9ses->name);
742 if (new_dentry->d_name.len >
743 (v9ses->maxdata - strlen(v9ses->name) - sizeof(struct v9fs_stat))) {
744 dprintk(DEBUG_ERROR, "new name too long\n");
748 strcpy(mistat->name, new_dentry->d_name.name);
749 retval = v9fs_t_wstat(v9ses, fid, mistat, &fcall);
755 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
763 * v9fs_vfs_getattr - retreive file metadata
764 * @mnt - mount information
765 * @dentry - file to get attributes on
766 * @stat - metadata structure to populate
771 v9fs_vfs_getattr(struct vfsmount *mnt, struct dentry *dentry,
774 struct v9fs_fcall *fcall = NULL;
775 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
776 struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
779 dprintk(DEBUG_VFS, "dentry: %p\n", dentry);
782 "couldn't find fid associated with dentry\n");
786 err = v9fs_t_stat(v9ses, fid->fid, &fcall);
789 dprintk(DEBUG_ERROR, "stat error\n");
791 v9fs_mistat2inode(fcall->params.rstat.stat, dentry->d_inode,
792 dentry->d_inode->i_sb);
793 generic_fillattr(dentry->d_inode, stat);
801 * v9fs_vfs_setattr - set file metadata
802 * @dentry: file whose metadata to set
803 * @iattr: metadata assignment structure
807 static int v9fs_vfs_setattr(struct dentry *dentry, struct iattr *iattr)
809 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
810 struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
811 struct v9fs_fcall *fcall = NULL;
812 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
815 dprintk(DEBUG_VFS, "\n");
822 "Couldn't find fid associated with dentry\n");
826 v9fs_blank_mistat(v9ses, mistat);
827 if (iattr->ia_valid & ATTR_MODE)
828 mistat->mode = unixmode2p9mode(v9ses, iattr->ia_mode);
830 if (iattr->ia_valid & ATTR_MTIME)
831 mistat->mtime = iattr->ia_mtime.tv_sec;
833 if (iattr->ia_valid & ATTR_ATIME)
834 mistat->atime = iattr->ia_atime.tv_sec;
836 if (iattr->ia_valid & ATTR_SIZE)
837 mistat->length = iattr->ia_size;
839 if (v9ses->extended) {
840 char *ptr = mistat->data+1;
842 if (iattr->ia_valid & ATTR_UID) {
844 ptr += 1+sprintf(ptr, "%08x", iattr->ia_uid);
845 mistat->n_uid = iattr->ia_uid;
848 if (iattr->ia_valid & ATTR_GID) {
850 ptr += 1+sprintf(ptr, "%08x", iattr->ia_gid);
851 mistat->n_gid = iattr->ia_gid;
855 res = v9fs_t_wstat(v9ses, fid->fid, mistat, &fcall);
858 dprintk(DEBUG_ERROR, "wstat error: %s\n", FCALL_ERROR(fcall));
864 res = inode_setattr(dentry->d_inode, iattr);
870 * v9fs_mistat2inode - populate an inode structure with mistat info
871 * @mistat: Plan 9 metadata (mistat) structure
872 * @inode: inode to populate
873 * @sb: superblock of filesystem
878 v9fs_mistat2inode(struct v9fs_stat *mistat, struct inode *inode,
879 struct super_block *sb)
881 struct v9fs_session_info *v9ses = sb->s_fs_info;
885 inode->i_atime.tv_sec = mistat->atime;
886 inode->i_mtime.tv_sec = mistat->mtime;
887 inode->i_ctime.tv_sec = mistat->mtime;
892 if (v9ses->extended) {
893 /* TODO: string to uid mapping via user-space daemon */
894 inode->i_uid = mistat->n_uid;
895 inode->i_gid = mistat->n_gid;
897 if (mistat->n_uid == -1)
898 sscanf(mistat->uid, "%x", &inode->i_uid);
900 if (mistat->n_gid == -1)
901 sscanf(mistat->gid, "%x", &inode->i_gid);
904 if (inode->i_uid == -1)
905 inode->i_uid = v9ses->uid;
906 if (inode->i_gid == -1)
907 inode->i_gid = v9ses->gid;
909 inode->i_mode = p9mode2unixmode(v9ses, mistat->mode);
910 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode))) {
914 sscanf(mistat->extension, "%c %u %u", &type, &major, &minor);
917 inode->i_mode &= ~S_IFBLK;
918 inode->i_mode |= S_IFCHR;
923 dprintk(DEBUG_ERROR, "Unknown special type %c (%s)\n",
924 type, mistat->extension);
926 inode->i_rdev = MKDEV(major, minor);
930 inode->i_size = mistat->length;
932 inode->i_blksize = sb->s_blocksize;
934 (inode->i_size + inode->i_blksize - 1) >> sb->s_blocksize_bits;
938 * v9fs_qid2ino - convert qid into inode number
941 * BUG: potential for inode number collisions?
944 ino_t v9fs_qid2ino(struct v9fs_qid *qid)
946 u64 path = qid->path + 2;
949 if (sizeof(ino_t) == sizeof(path))
950 memcpy(&i, &path, sizeof(ino_t));
952 i = (ino_t) (path ^ (path >> 32));
958 * v9fs_vfs_symlink - helper function to create symlinks
959 * @dir: directory inode containing symlink
960 * @dentry: dentry for symlink
961 * @symname: symlink data
963 * See 9P2000.u RFC for more information
968 v9fs_vfs_symlink(struct inode *dir, struct dentry *dentry, const char *symname)
971 struct v9fs_fid *newfid;
972 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
973 struct v9fs_fcall *fcall = NULL;
974 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
976 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
982 if (!v9ses->extended) {
983 dprintk(DEBUG_ERROR, "not extended\n");
988 retval = v9fs_create(dir, dentry, S_IFLNK, 0);
992 newfid = v9fs_fid_lookup(dentry);
995 v9fs_blank_mistat(v9ses, mistat);
996 strcpy(mistat->data + 1, symname);
997 mistat->extension = mistat->data + 1;
998 retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
1000 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
1001 FCALL_ERROR(fcall));
1007 if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
1008 dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
1009 FCALL_ERROR(fcall));
1013 d_drop(dentry); /* FID - will this also clunk? */
1023 * v9fs_readlink - read a symlink's location (internal version)
1024 * @dentry: dentry for symlink
1025 * @buffer: buffer to load symlink location into
1026 * @buflen: length of buffer
1030 static int v9fs_readlink(struct dentry *dentry, char *buffer, int buflen)
1032 int retval = -EPERM;
1034 struct v9fs_fcall *fcall = NULL;
1035 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dentry->d_inode);
1036 struct v9fs_fid *fid = v9fs_fid_lookup(dentry);
1039 dprintk(DEBUG_ERROR, "could not resolve fid from dentry\n");
1044 if (!v9ses->extended) {
1046 dprintk(DEBUG_ERROR, "not extended\n");
1050 dprintk(DEBUG_VFS, " %s\n", dentry->d_name.name);
1051 retval = v9fs_t_stat(v9ses, fid->fid, &fcall);
1054 dprintk(DEBUG_ERROR, "stat error\n");
1061 if (!(fcall->params.rstat.stat->mode & V9FS_DMSYMLINK)) {
1066 /* copy extension buffer into buffer */
1067 if (strlen(fcall->params.rstat.stat->extension) < buflen)
1068 buflen = strlen(fcall->params.rstat.stat->extension);
1070 memcpy(buffer, fcall->params.rstat.stat->extension, buflen + 1);
1081 * v9fs_vfs_readlink - read a symlink's location
1082 * @dentry: dentry for symlink
1083 * @buf: buffer to load symlink location into
1084 * @buflen: length of buffer
1088 static int v9fs_vfs_readlink(struct dentry *dentry, char __user * buffer,
1093 char *link = __getname();
1095 if (buflen > PATH_MAX)
1098 dprintk(DEBUG_VFS, " dentry: %s (%p)\n", dentry->d_iname, dentry);
1100 retval = v9fs_readlink(dentry, link, buflen);
1103 if ((ret = copy_to_user(buffer, link, retval)) != 0) {
1104 dprintk(DEBUG_ERROR, "problem copying to user: %d\n",
1115 * v9fs_vfs_follow_link - follow a symlink path
1116 * @dentry: dentry for symlink
1121 static void *v9fs_vfs_follow_link(struct dentry *dentry, struct nameidata *nd)
1124 char *link = __getname();
1126 dprintk(DEBUG_VFS, "%s n", dentry->d_name.name);
1129 link = ERR_PTR(-ENOMEM);
1131 len = v9fs_readlink(dentry, link, strlen(link));
1135 link = ERR_PTR(len);
1139 nd_set_link(nd, link);
1145 * v9fs_vfs_put_link - release a symlink path
1146 * @dentry: dentry for symlink
1151 static void v9fs_vfs_put_link(struct dentry *dentry, struct nameidata *nd, void *p)
1153 char *s = nd_get_link(nd);
1155 dprintk(DEBUG_VFS, " %s %s\n", dentry->d_name.name, s);
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
1168 /* XXX - lots of code dup'd from symlink and creates,
1169 * figure out a better reuse strategy
1173 v9fs_vfs_link(struct dentry *old_dentry, struct inode *dir,
1174 struct dentry *dentry)
1176 int retval = -EPERM;
1177 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1178 struct v9fs_fcall *fcall = NULL;
1179 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
1180 struct v9fs_fid *oldfid = v9fs_fid_lookup(old_dentry);
1181 struct v9fs_fid *newfid = NULL;
1182 char *symname = __getname();
1184 dprintk(DEBUG_VFS, " %lu,%s,%s\n", dir->i_ino, dentry->d_name.name,
1185 old_dentry->d_name.name);
1187 if (!v9ses->extended) {
1188 dprintk(DEBUG_ERROR, "not extended\n");
1192 /* get fid of old_dentry */
1193 sprintf(symname, "hardlink(%d)\n", oldfid->fid);
1195 /* issue a create */
1196 retval = v9fs_create(dir, dentry, V9FS_DMLINK, 0);
1200 newfid = v9fs_fid_lookup(dentry);
1202 dprintk(DEBUG_ERROR, "couldn't resolve fid from dentry\n");
1206 /* issue a twstat */
1207 v9fs_blank_mistat(v9ses, mistat);
1208 strcpy(mistat->data + 1, symname);
1209 mistat->extension = mistat->data + 1;
1210 retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
1212 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
1213 FCALL_ERROR(fcall));
1219 if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
1220 dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
1221 FCALL_ERROR(fcall));
1225 d_drop(dentry); /* FID - will this also clunk? */
1238 * v9fs_vfs_mknod - create a special file
1239 * @dir: inode destination for new link
1240 * @dentry: dentry for file
1241 * @mode: mode for creation
1242 * @dev_t: device associated with special file
1247 v9fs_vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t rdev)
1249 int retval = -EPERM;
1250 struct v9fs_fid *newfid;
1251 struct v9fs_session_info *v9ses = v9fs_inode2v9ses(dir);
1252 struct v9fs_fcall *fcall = NULL;
1253 struct v9fs_stat *mistat = kmalloc(v9ses->maxdata, GFP_KERNEL);
1254 char *symname = __getname();
1256 dprintk(DEBUG_VFS, " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
1257 dentry->d_name.name, mode, MAJOR(rdev), MINOR(rdev));
1262 if (!new_valid_dev(rdev)) {
1267 if (!v9ses->extended) {
1268 dprintk(DEBUG_ERROR, "not extended\n");
1272 /* issue a create */
1273 retval = v9fs_create(dir, dentry, mode, 0);
1278 newfid = v9fs_fid_lookup(dentry);
1280 dprintk(DEBUG_ERROR, "coudn't resove fid from dentry\n");
1285 /* build extension */
1287 sprintf(symname, "b %u %u", MAJOR(rdev), MINOR(rdev));
1288 else if (S_ISCHR(mode))
1289 sprintf(symname, "c %u %u", MAJOR(rdev), MINOR(rdev));
1290 else if (S_ISFIFO(mode))
1297 if (!S_ISFIFO(mode)) {
1298 /* issue a twstat */
1299 v9fs_blank_mistat(v9ses, mistat);
1300 strcpy(mistat->data + 1, symname);
1301 mistat->extension = mistat->data + 1;
1302 retval = v9fs_t_wstat(v9ses, newfid->fid, mistat, &fcall);
1304 dprintk(DEBUG_ERROR, "v9fs_t_wstat error: %s\n",
1305 FCALL_ERROR(fcall));
1310 /* need to update dcache so we show up */
1313 if (v9fs_t_clunk(v9ses, newfid->fid, &fcall)) {
1314 dprintk(DEBUG_ERROR, "clunk for symlink failed: %s\n",
1315 FCALL_ERROR(fcall));
1319 d_drop(dentry); /* FID - will this also clunk? */
1329 static struct inode_operations v9fs_dir_inode_operations_ext = {
1330 .create = v9fs_vfs_create,
1331 .lookup = v9fs_vfs_lookup,
1332 .symlink = v9fs_vfs_symlink,
1333 .link = v9fs_vfs_link,
1334 .unlink = v9fs_vfs_unlink,
1335 .mkdir = v9fs_vfs_mkdir,
1336 .rmdir = v9fs_vfs_rmdir,
1337 .mknod = v9fs_vfs_mknod,
1338 .rename = v9fs_vfs_rename,
1339 .readlink = v9fs_vfs_readlink,
1340 .getattr = v9fs_vfs_getattr,
1341 .setattr = v9fs_vfs_setattr,
1344 static struct inode_operations v9fs_dir_inode_operations = {
1345 .create = v9fs_vfs_create,
1346 .lookup = v9fs_vfs_lookup,
1347 .unlink = v9fs_vfs_unlink,
1348 .mkdir = v9fs_vfs_mkdir,
1349 .rmdir = v9fs_vfs_rmdir,
1350 .mknod = v9fs_vfs_mknod,
1351 .rename = v9fs_vfs_rename,
1352 .getattr = v9fs_vfs_getattr,
1353 .setattr = v9fs_vfs_setattr,
1356 static struct inode_operations v9fs_file_inode_operations = {
1357 .getattr = v9fs_vfs_getattr,
1358 .setattr = v9fs_vfs_setattr,
1361 static struct inode_operations v9fs_symlink_inode_operations = {
1362 .readlink = v9fs_vfs_readlink,
1363 .follow_link = v9fs_vfs_follow_link,
1364 .put_link = v9fs_vfs_put_link,
1365 .getattr = v9fs_vfs_getattr,
1366 .setattr = v9fs_vfs_setattr,