2 * linux/fs/9p/vfs_inode_dotl.c
4 * This file contains vfs inode ops for the 9P2000.L 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 <linux/xattr.h>
39 #include <linux/posix_acl.h>
40 #include <net/9p/9p.h>
41 #include <net/9p/client.h>
51 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
55 * v9fs_get_fsgid_for_create - Helper function to get the gid for creating a
56 * new file system object. This checks the S_ISGID to determine the owning
57 * group of the new file system object.
60 static gid_t v9fs_get_fsgid_for_create(struct inode *dir_inode)
62 BUG_ON(dir_inode == NULL);
64 if (dir_inode->i_mode & S_ISGID) {
65 /* set_gid bit is set.*/
66 return dir_inode->i_gid;
68 return current_fsgid();
72 * v9fs_dentry_from_dir_inode - helper function to get the dentry from
77 static struct dentry *v9fs_dentry_from_dir_inode(struct inode *inode)
79 struct dentry *dentry;
81 spin_lock(&inode->i_lock);
82 /* Directory should have only one entry. */
83 BUG_ON(S_ISDIR(inode->i_mode) && !list_is_singular(&inode->i_dentry));
84 dentry = list_entry(inode->i_dentry.next, struct dentry, d_alias);
85 spin_unlock(&inode->i_lock);
90 v9fs_inode_dotl(struct v9fs_session_info *v9ses, struct p9_fid *fid,
91 struct super_block *sb)
93 struct inode *ret = NULL;
95 struct p9_stat_dotl *st;
97 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
101 ret = v9fs_get_inode(sb, st->st_mode);
107 v9fs_stat2inode_dotl(st, ret);
108 ret->i_ino = v9fs_qid2ino(&st->qid);
109 #ifdef CONFIG_9P_FSCACHE
110 v9fs_vcookie_set_qid(ret, &st->qid);
111 v9fs_cache_inode_get_cookie(ret);
113 err = v9fs_get_acl(ret, fid);
126 * v9fs_vfs_create_dotl - VFS hook to create files for 9P2000.L protocol.
127 * @dir: directory inode that is being created
128 * @dentry: dentry that is being deleted
129 * @mode: create permissions
130 * @nd: path information
135 v9fs_vfs_create_dotl(struct inode *dir, struct dentry *dentry, int omode,
136 struct nameidata *nd)
143 struct v9fs_session_info *v9ses;
144 struct p9_fid *fid = NULL;
145 struct p9_fid *dfid, *ofid;
149 struct posix_acl *pacl = NULL, *dacl = NULL;
151 v9ses = v9fs_inode2v9ses(dir);
152 if (nd && nd->flags & LOOKUP_OPEN)
153 flags = nd->intent.open.flags - 1;
156 * create call without LOOKUP_OPEN is due
157 * to mknod of regular files. So use mknod
160 return v9fs_vfs_mknod_dotl(dir, dentry, omode, 0);
163 name = (char *) dentry->d_name.name;
164 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_create_dotl: name:%s flags:0x%x "
165 "mode:0x%x\n", name, flags, omode);
167 dfid = v9fs_fid_lookup(dentry->d_parent);
170 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
174 /* clone a fid to use for creation */
175 ofid = p9_client_walk(dfid, 0, NULL, 1);
178 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n", err);
182 gid = v9fs_get_fsgid_for_create(dir);
185 /* Update mode based on ACL value */
186 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
188 P9_DPRINTK(P9_DEBUG_VFS,
189 "Failed to get acl values in creat %d\n", err);
192 err = p9_client_create_dotl(ofid, name, flags, mode, gid, &qid);
194 P9_DPRINTK(P9_DEBUG_VFS,
195 "p9_client_open_dotl failed in creat %d\n",
200 /* instantiate inode and assign the unopened fid to the dentry */
201 fid = p9_client_walk(dfid, 1, &name, 1);
204 P9_DPRINTK(P9_DEBUG_VFS, "p9_clinet_walk failed %d\n", err);
208 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
210 err = PTR_ERR(inode);
211 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n", err);
215 dentry->d_op = &v9fs_cached_dentry_operations;
217 dentry->d_op = &v9fs_dentry_operations;
219 d_instantiate(dentry, inode);
220 err = v9fs_fid_add(dentry, fid);
224 /* Now set the ACL based on the default value */
225 v9fs_set_create_acl(dentry, dacl, pacl);
227 /* Since we are opening a file, assign the open fid to the file */
228 filp = lookup_instantiate_filp(nd, dentry, generic_file_open);
230 p9_client_clunk(ofid);
231 return PTR_ERR(filp);
233 filp->private_data = ofid;
238 p9_client_clunk(ofid);
240 p9_client_clunk(fid);
245 * v9fs_vfs_mkdir_dotl - VFS mkdir hook to create a directory
246 * @dir: inode that is being unlinked
247 * @dentry: dentry that is being unlinked
248 * @mode: mode for new directory
252 static int v9fs_vfs_mkdir_dotl(struct inode *dir,
253 struct dentry *dentry, int omode)
256 struct v9fs_session_info *v9ses;
257 struct p9_fid *fid = NULL, *dfid = NULL;
263 struct dentry *dir_dentry;
264 struct posix_acl *dacl = NULL, *pacl = NULL;
266 P9_DPRINTK(P9_DEBUG_VFS, "name %s\n", dentry->d_name.name);
268 v9ses = v9fs_inode2v9ses(dir);
271 if (dir->i_mode & S_ISGID)
274 dir_dentry = v9fs_dentry_from_dir_inode(dir);
275 dfid = v9fs_fid_lookup(dir_dentry);
278 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
283 gid = v9fs_get_fsgid_for_create(dir);
285 /* Update mode based on ACL value */
286 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
288 P9_DPRINTK(P9_DEBUG_VFS,
289 "Failed to get acl values in mkdir %d\n", err);
292 name = (char *) dentry->d_name.name;
293 err = p9_client_mkdir_dotl(dfid, name, mode, gid, &qid);
297 /* instantiate inode and assign the unopened fid to the dentry */
298 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
299 fid = p9_client_walk(dfid, 1, &name, 1);
302 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
308 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
310 err = PTR_ERR(inode);
311 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
315 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
316 d_instantiate(dentry, inode);
317 err = v9fs_fid_add(dentry, fid);
323 * Not in cached mode. No need to populate
324 * inode with stat. We need to get an inode
325 * so that we can set the acl with dentry
327 inode = v9fs_get_inode(dir->i_sb, mode);
329 err = PTR_ERR(inode);
332 d_set_d_op(dentry, &v9fs_dentry_operations);
333 d_instantiate(dentry, inode);
335 /* Now set the ACL based on the default value */
336 v9fs_set_create_acl(dentry, dacl, pacl);
340 p9_client_clunk(fid);
345 v9fs_vfs_getattr_dotl(struct vfsmount *mnt, struct dentry *dentry,
349 struct v9fs_session_info *v9ses;
351 struct p9_stat_dotl *st;
353 P9_DPRINTK(P9_DEBUG_VFS, "dentry: %p\n", dentry);
355 v9ses = v9fs_inode2v9ses(dentry->d_inode);
356 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE)
357 return simple_getattr(mnt, dentry, stat);
359 fid = v9fs_fid_lookup(dentry);
363 /* Ask for all the fields in stat structure. Server will return
364 * whatever it supports
367 st = p9_client_getattr_dotl(fid, P9_STATS_ALL);
371 v9fs_stat2inode_dotl(st, dentry->d_inode);
372 generic_fillattr(dentry->d_inode, stat);
373 /* Change block size to what the server returned */
374 stat->blksize = st->st_blksize;
381 * v9fs_vfs_setattr_dotl - set file metadata
382 * @dentry: file whose metadata to set
383 * @iattr: metadata assignment structure
387 int v9fs_vfs_setattr_dotl(struct dentry *dentry, struct iattr *iattr)
390 struct v9fs_session_info *v9ses;
392 struct p9_iattr_dotl p9attr;
394 P9_DPRINTK(P9_DEBUG_VFS, "\n");
396 retval = inode_change_ok(dentry->d_inode, iattr);
400 p9attr.valid = iattr->ia_valid;
401 p9attr.mode = iattr->ia_mode;
402 p9attr.uid = iattr->ia_uid;
403 p9attr.gid = iattr->ia_gid;
404 p9attr.size = iattr->ia_size;
405 p9attr.atime_sec = iattr->ia_atime.tv_sec;
406 p9attr.atime_nsec = iattr->ia_atime.tv_nsec;
407 p9attr.mtime_sec = iattr->ia_mtime.tv_sec;
408 p9attr.mtime_nsec = iattr->ia_mtime.tv_nsec;
411 v9ses = v9fs_inode2v9ses(dentry->d_inode);
412 fid = v9fs_fid_lookup(dentry);
416 retval = p9_client_setattr(fid, &p9attr);
420 if ((iattr->ia_valid & ATTR_SIZE) &&
421 iattr->ia_size != i_size_read(dentry->d_inode)) {
422 retval = vmtruncate(dentry->d_inode, iattr->ia_size);
427 setattr_copy(dentry->d_inode, iattr);
428 mark_inode_dirty(dentry->d_inode);
429 if (iattr->ia_valid & ATTR_MODE) {
430 /* We also want to update ACL when we update mode bits */
431 retval = v9fs_acl_chmod(dentry);
439 * v9fs_stat2inode_dotl - populate an inode structure with stat info
440 * @stat: stat structure
441 * @inode: inode to populate
442 * @sb: superblock of filesystem
447 v9fs_stat2inode_dotl(struct p9_stat_dotl *stat, struct inode *inode)
450 if ((stat->st_result_mask & P9_STATS_BASIC) == P9_STATS_BASIC) {
451 inode->i_atime.tv_sec = stat->st_atime_sec;
452 inode->i_atime.tv_nsec = stat->st_atime_nsec;
453 inode->i_mtime.tv_sec = stat->st_mtime_sec;
454 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
455 inode->i_ctime.tv_sec = stat->st_ctime_sec;
456 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
457 inode->i_uid = stat->st_uid;
458 inode->i_gid = stat->st_gid;
459 inode->i_nlink = stat->st_nlink;
460 inode->i_mode = stat->st_mode;
461 inode->i_rdev = new_decode_dev(stat->st_rdev);
463 if ((S_ISBLK(inode->i_mode)) || (S_ISCHR(inode->i_mode)))
464 init_special_inode(inode, inode->i_mode, inode->i_rdev);
466 i_size_write(inode, stat->st_size);
467 inode->i_blocks = stat->st_blocks;
469 if (stat->st_result_mask & P9_STATS_ATIME) {
470 inode->i_atime.tv_sec = stat->st_atime_sec;
471 inode->i_atime.tv_nsec = stat->st_atime_nsec;
473 if (stat->st_result_mask & P9_STATS_MTIME) {
474 inode->i_mtime.tv_sec = stat->st_mtime_sec;
475 inode->i_mtime.tv_nsec = stat->st_mtime_nsec;
477 if (stat->st_result_mask & P9_STATS_CTIME) {
478 inode->i_ctime.tv_sec = stat->st_ctime_sec;
479 inode->i_ctime.tv_nsec = stat->st_ctime_nsec;
481 if (stat->st_result_mask & P9_STATS_UID)
482 inode->i_uid = stat->st_uid;
483 if (stat->st_result_mask & P9_STATS_GID)
484 inode->i_gid = stat->st_gid;
485 if (stat->st_result_mask & P9_STATS_NLINK)
486 inode->i_nlink = stat->st_nlink;
487 if (stat->st_result_mask & P9_STATS_MODE) {
488 inode->i_mode = stat->st_mode;
489 if ((S_ISBLK(inode->i_mode)) ||
490 (S_ISCHR(inode->i_mode)))
491 init_special_inode(inode, inode->i_mode,
494 if (stat->st_result_mask & P9_STATS_RDEV)
495 inode->i_rdev = new_decode_dev(stat->st_rdev);
496 if (stat->st_result_mask & P9_STATS_SIZE)
497 i_size_write(inode, stat->st_size);
498 if (stat->st_result_mask & P9_STATS_BLOCKS)
499 inode->i_blocks = stat->st_blocks;
501 if (stat->st_result_mask & P9_STATS_GEN)
502 inode->i_generation = stat->st_gen;
504 /* Currently we don't support P9_STATS_BTIME and P9_STATS_DATA_VERSION
505 * because the inode structure does not have fields for them.
510 v9fs_vfs_symlink_dotl(struct inode *dir, struct dentry *dentry,
513 struct v9fs_session_info *v9ses;
515 struct p9_fid *fid = NULL;
522 name = (char *) dentry->d_name.name;
523 P9_DPRINTK(P9_DEBUG_VFS, "v9fs_vfs_symlink_dotl : %lu,%s,%s\n",
524 dir->i_ino, name, symname);
525 v9ses = v9fs_inode2v9ses(dir);
527 dfid = v9fs_fid_lookup(dentry->d_parent);
530 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
534 gid = v9fs_get_fsgid_for_create(dir);
536 /* Server doesn't alter fid on TSYMLINK. Hence no need to clone it. */
537 err = p9_client_symlink(dfid, name, (char *)symname, gid, &qid);
540 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_symlink failed %d\n", err);
545 /* Now walk from the parent so we can get an unopened fid. */
546 fid = p9_client_walk(dfid, 1, &name, 1);
549 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
555 /* instantiate inode and assign the unopened fid to dentry */
556 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
558 err = PTR_ERR(inode);
559 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
563 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
564 d_instantiate(dentry, inode);
565 err = v9fs_fid_add(dentry, fid);
570 /* Not in cached mode. No need to populate inode with stat */
571 inode = v9fs_get_inode(dir->i_sb, S_IFLNK);
573 err = PTR_ERR(inode);
576 d_set_d_op(dentry, &v9fs_dentry_operations);
577 d_instantiate(dentry, inode);
582 p9_client_clunk(fid);
588 * v9fs_vfs_link_dotl - create a hardlink for dotl
589 * @old_dentry: dentry for file to link to
590 * @dir: inode destination for new link
591 * @dentry: dentry for link
596 v9fs_vfs_link_dotl(struct dentry *old_dentry, struct inode *dir,
597 struct dentry *dentry)
600 struct p9_fid *dfid, *oldfid;
602 struct v9fs_session_info *v9ses;
603 struct dentry *dir_dentry;
605 P9_DPRINTK(P9_DEBUG_VFS, "dir ino: %lu, old_name: %s, new_name: %s\n",
606 dir->i_ino, old_dentry->d_name.name,
607 dentry->d_name.name);
609 v9ses = v9fs_inode2v9ses(dir);
610 dir_dentry = v9fs_dentry_from_dir_inode(dir);
611 dfid = v9fs_fid_lookup(dir_dentry);
613 return PTR_ERR(dfid);
615 oldfid = v9fs_fid_lookup(old_dentry);
617 return PTR_ERR(oldfid);
619 name = (char *) dentry->d_name.name;
621 err = p9_client_link(dfid, oldfid, (char *)dentry->d_name.name);
624 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_link failed %d\n", err);
628 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
629 /* Get the latest stat info from server. */
631 struct p9_stat_dotl *st;
633 fid = v9fs_fid_lookup(old_dentry);
637 st = p9_client_getattr_dotl(fid, P9_STATS_BASIC);
641 v9fs_stat2inode_dotl(st, old_dentry->d_inode);
645 /* Caching disabled. No need to get upto date stat info.
646 * This dentry will be released immediately. So, just hold the
649 ihold(old_dentry->d_inode);
652 d_set_d_op(dentry, old_dentry->d_op);
653 d_instantiate(dentry, old_dentry->d_inode);
659 * v9fs_vfs_mknod_dotl - create a special file
660 * @dir: inode destination for new link
661 * @dentry: dentry for file
662 * @mode: mode for creation
663 * @rdev: device associated with special file
667 v9fs_vfs_mknod_dotl(struct inode *dir, struct dentry *dentry, int omode,
673 struct v9fs_session_info *v9ses;
674 struct p9_fid *fid = NULL, *dfid = NULL;
678 struct dentry *dir_dentry;
679 struct posix_acl *dacl = NULL, *pacl = NULL;
681 P9_DPRINTK(P9_DEBUG_VFS,
682 " %lu,%s mode: %x MAJOR: %u MINOR: %u\n", dir->i_ino,
683 dentry->d_name.name, omode, MAJOR(rdev), MINOR(rdev));
685 if (!new_valid_dev(rdev))
688 v9ses = v9fs_inode2v9ses(dir);
689 dir_dentry = v9fs_dentry_from_dir_inode(dir);
690 dfid = v9fs_fid_lookup(dir_dentry);
693 P9_DPRINTK(P9_DEBUG_VFS, "fid lookup failed %d\n", err);
698 gid = v9fs_get_fsgid_for_create(dir);
700 /* Update mode based on ACL value */
701 err = v9fs_acl_mode(dir, &mode, &dacl, &pacl);
703 P9_DPRINTK(P9_DEBUG_VFS,
704 "Failed to get acl values in mknod %d\n", err);
707 name = (char *) dentry->d_name.name;
709 err = p9_client_mknod_dotl(dfid, name, mode, rdev, gid, &qid);
713 /* instantiate inode and assign the unopened fid to the dentry */
714 if (v9ses->cache == CACHE_LOOSE || v9ses->cache == CACHE_FSCACHE) {
715 fid = p9_client_walk(dfid, 1, &name, 1);
718 P9_DPRINTK(P9_DEBUG_VFS, "p9_client_walk failed %d\n",
724 inode = v9fs_inode_from_fid(v9ses, fid, dir->i_sb);
726 err = PTR_ERR(inode);
727 P9_DPRINTK(P9_DEBUG_VFS, "inode creation failed %d\n",
731 d_set_d_op(dentry, &v9fs_cached_dentry_operations);
732 d_instantiate(dentry, inode);
733 err = v9fs_fid_add(dentry, fid);
739 * Not in cached mode. No need to populate inode with stat.
740 * socket syscall returns a fd, so we need instantiate
742 inode = v9fs_get_inode(dir->i_sb, mode);
744 err = PTR_ERR(inode);
747 d_set_d_op(dentry, &v9fs_dentry_operations);
748 d_instantiate(dentry, inode);
750 /* Now set the ACL based on the default value */
751 v9fs_set_create_acl(dentry, dacl, pacl);
754 p9_client_clunk(fid);
759 * v9fs_vfs_follow_link_dotl - follow a symlink path
760 * @dentry: dentry for symlink
766 v9fs_vfs_follow_link_dotl(struct dentry *dentry, struct nameidata *nd)
770 char *link = __getname();
773 P9_DPRINTK(P9_DEBUG_VFS, "%s\n", dentry->d_name.name);
776 link = ERR_PTR(-ENOMEM);
779 fid = v9fs_fid_lookup(dentry);
782 link = ERR_PTR(PTR_ERR(fid));
785 retval = p9_client_readlink(fid, &target);
787 strcpy(link, target);
792 link = ERR_PTR(retval);
794 nd_set_link(nd, link);
798 const struct inode_operations v9fs_dir_inode_operations_dotl = {
799 .create = v9fs_vfs_create_dotl,
800 .lookup = v9fs_vfs_lookup,
801 .link = v9fs_vfs_link_dotl,
802 .symlink = v9fs_vfs_symlink_dotl,
803 .unlink = v9fs_vfs_unlink,
804 .mkdir = v9fs_vfs_mkdir_dotl,
805 .rmdir = v9fs_vfs_rmdir,
806 .mknod = v9fs_vfs_mknod_dotl,
807 .rename = v9fs_vfs_rename,
808 .getattr = v9fs_vfs_getattr_dotl,
809 .setattr = v9fs_vfs_setattr_dotl,
810 .setxattr = generic_setxattr,
811 .getxattr = generic_getxattr,
812 .removexattr = generic_removexattr,
813 .listxattr = v9fs_listxattr,
814 .check_acl = v9fs_check_acl,
817 const struct inode_operations v9fs_file_inode_operations_dotl = {
818 .getattr = v9fs_vfs_getattr_dotl,
819 .setattr = v9fs_vfs_setattr_dotl,
820 .setxattr = generic_setxattr,
821 .getxattr = generic_getxattr,
822 .removexattr = generic_removexattr,
823 .listxattr = v9fs_listxattr,
824 .check_acl = v9fs_check_acl,
827 const struct inode_operations v9fs_symlink_inode_operations_dotl = {
828 .readlink = generic_readlink,
829 .follow_link = v9fs_vfs_follow_link_dotl,
830 .put_link = v9fs_vfs_put_link,
831 .getattr = v9fs_vfs_getattr_dotl,
832 .setattr = v9fs_vfs_setattr_dotl,
833 .setxattr = generic_setxattr,
834 .getxattr = generic_getxattr,
835 .removexattr = generic_removexattr,
836 .listxattr = v9fs_listxattr,