4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
22 * Copyright (C) 2011 Lawrence Livermore National Security, LLC.
23 * Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
25 * Rewritten for Linux by:
26 * Rohan Puri <rohan.puri15@gmail.com>
27 * Brian Behlendorf <behlendorf1@llnl.gov>
30 #include <sys/zfs_vfsops.h>
31 #include <sys/zfs_vnops.h>
32 #include <sys/zfs_znode.h>
33 #include <sys/zfs_ctldir.h>
37 * Common open routine. Disallow any write access.
41 zpl_common_open(struct inode *ip, struct file *filp)
43 if (filp->f_mode & FMODE_WRITE)
46 return generic_file_open(ip, filp);
50 zpl_common_readdir(struct file *filp, void *dirent, filldir_t filldir)
52 struct dentry *dentry = filp->f_path.dentry;
53 struct inode *ip = dentry->d_inode;
56 switch (filp->f_pos) {
58 error = filldir(dirent, ".", 1, 0, ip->i_ino, DT_DIR);
65 error = filldir(dirent, "..", 2, 1, parent_ino(dentry), DT_DIR);
79 * Get root directory contents.
82 zpl_root_readdir(struct file *filp, void *dirent, filldir_t filldir)
84 struct dentry *dentry = filp->f_path.dentry;
85 struct inode *ip = dentry->d_inode;
86 zfs_sb_t *zsb = ITOZSB(ip);
91 switch (filp->f_pos) {
93 error = filldir(dirent, ".", 1, 0, ip->i_ino, DT_DIR);
100 error = filldir(dirent, "..", 2, 1, parent_ino(dentry), DT_DIR);
107 error = filldir(dirent, ZFS_SNAPDIR_NAME,
108 strlen(ZFS_SNAPDIR_NAME), 2, ZFSCTL_INO_SNAPDIR, DT_DIR);
115 error = filldir(dirent, ZFS_SHAREDIR_NAME,
116 strlen(ZFS_SHAREDIR_NAME), 3, ZFSCTL_INO_SHARES, DT_DIR);
130 * Get root directory attributes.
134 zpl_root_getattr(struct vfsmount *mnt, struct dentry *dentry,
139 error = simple_getattr(mnt, dentry, stat);
140 stat->atime = CURRENT_TIME;
145 static struct dentry *
146 #ifdef HAVE_LOOKUP_NAMEIDATA
147 zpl_root_lookup(struct inode *dip, struct dentry *dentry, struct nameidata *nd)
149 zpl_root_lookup(struct inode *dip, struct dentry *dentry, unsigned int flags)
157 error = -zfsctl_root_lookup(dip, dname(dentry), &ip, 0, cr, NULL, NULL);
158 ASSERT3S(error, <=, 0);
162 if (error == -ENOENT)
163 return d_splice_alias(NULL, dentry);
165 return ERR_PTR(error);
168 return d_splice_alias(ip, dentry);
172 * The '.zfs' control directory file and inode operations.
174 const struct file_operations zpl_fops_root = {
175 .open = zpl_common_open,
176 .llseek = generic_file_llseek,
177 .read = generic_read_dir,
178 .readdir = zpl_root_readdir,
181 const struct inode_operations zpl_ops_root = {
182 .lookup = zpl_root_lookup,
183 .getattr = zpl_root_getattr,
186 #ifdef HAVE_AUTOMOUNT
187 static struct vfsmount *
188 zpl_snapdir_automount(struct path *path)
190 struct dentry *dentry = path->dentry;
194 * We must briefly disable automounts for this dentry because the
195 * user space mount utility will trigger another lookup on this
196 * directory. That will result in zpl_snapdir_automount() being
197 * called repeatedly. The DCACHE_NEED_AUTOMOUNT flag can be
198 * safely reset once the mount completes.
200 dentry->d_flags &= ~DCACHE_NEED_AUTOMOUNT;
201 error = -zfsctl_mount_snapshot(path, 0);
202 dentry->d_flags |= DCACHE_NEED_AUTOMOUNT;
204 return ERR_PTR(error);
207 * Rather than returning the new vfsmount for the snapshot we must
208 * return NULL to indicate a mount collision. This is done because
209 * the user space mount calls do_add_mount() which adds the vfsmount
210 * to the name space. If we returned the new mount here it would be
211 * added again to the vfsmount list resulting in list corruption.
215 #endif /* HAVE_AUTOMOUNT */
218 * Revalidate any dentry in the snapshot directory on lookup, since a snapshot
219 * having the same name have been created or destroyed since it was cached.
222 #ifdef HAVE_D_REVALIDATE_NAMEIDATA
223 zpl_snapdir_revalidate(struct dentry *dentry, struct nameidata *i)
225 zpl_snapdir_revalidate(struct dentry *dentry, unsigned int flags)
231 dentry_operations_t zpl_dops_snapdirs = {
233 * Auto mounting of snapshots is only supported for 2.6.37 and
234 * newer kernels. Prior to this kernel the ops->follow_link()
235 * callback was used as a hack to trigger the mount. The
236 * resulting vfsmount was then explicitly grafted in to the
237 * name space. While it might be possible to add compatibility
238 * code to accomplish this it would require considerable care.
240 #ifdef HAVE_AUTOMOUNT
241 .d_automount = zpl_snapdir_automount,
242 #endif /* HAVE_AUTOMOUNT */
243 .d_revalidate = zpl_snapdir_revalidate,
246 static struct dentry *
247 #ifdef HAVE_LOOKUP_NAMEIDATA
248 zpl_snapdir_lookup(struct inode *dip, struct dentry *dentry,
249 struct nameidata *nd)
251 zpl_snapdir_lookup(struct inode *dip, struct dentry *dentry,
257 struct inode *ip = NULL;
261 error = -zfsctl_snapdir_lookup(dip, dname(dentry), &ip,
263 ASSERT3S(error, <=, 0);
266 if (error && error != -ENOENT)
267 return ERR_PTR(error);
269 ASSERT(error == 0 || ip == NULL);
270 d_set_d_op(dentry, &zpl_dops_snapdirs);
272 return d_splice_alias(ip, dentry);
277 zpl_snapdir_readdir(struct file *filp, void *dirent, filldir_t filldir)
279 struct dentry *dentry = filp->f_path.dentry;
280 struct inode *dip = dentry->d_inode;
281 zfs_sb_t *zsb = ITOZSB(dip);
282 char snapname[MAXNAMELEN];
284 boolean_t case_conflict;
289 cookie = filp->f_pos;
290 switch (filp->f_pos) {
292 error = filldir(dirent, ".", 1, 0, dip->i_ino, DT_DIR);
299 error = filldir(dirent, "..", 2, 1, parent_ino(dentry), DT_DIR);
307 error = -dmu_snapshot_list_next(zsb->z_os, MAXNAMELEN,
308 snapname, &id, &cookie, &case_conflict);
312 error = filldir(dirent, snapname, strlen(snapname),
313 filp->f_pos, ZFSCTL_INO_SHARES - id, DT_DIR);
317 filp->f_pos = cookie;
323 if (error == -ENOENT)
330 zpl_snapdir_rename(struct inode *sdip, struct dentry *sdentry,
331 struct inode *tdip, struct dentry *tdentry)
337 error = -zfsctl_snapdir_rename(sdip, dname(sdentry),
338 tdip, dname(tdentry), cr, 0);
339 ASSERT3S(error, <=, 0);
346 zpl_snapdir_rmdir(struct inode *dip, struct dentry *dentry)
352 error = -zfsctl_snapdir_remove(dip, dname(dentry), cr, 0);
353 ASSERT3S(error, <=, 0);
360 zpl_snapdir_mkdir(struct inode *dip, struct dentry *dentry, zpl_umode_t mode)
368 vap = kmem_zalloc(sizeof(vattr_t), KM_SLEEP);
369 zpl_vap_init(vap, dip, dentry, mode | S_IFDIR, cr);
371 error = -zfsctl_snapdir_mkdir(dip, dname(dentry), vap, &ip, cr, 0);
373 d_set_d_op(dentry, &zpl_dops_snapdirs);
374 d_instantiate(dentry, ip);
377 kmem_free(vap, sizeof(vattr_t));
378 ASSERT3S(error, <=, 0);
385 * Get snapshot directory attributes.
389 zpl_snapdir_getattr(struct vfsmount *mnt, struct dentry *dentry,
392 zfs_sb_t *zsb = ITOZSB(dentry->d_inode);
396 error = simple_getattr(mnt, dentry, stat);
397 stat->nlink = stat->size = avl_numnodes(&zsb->z_ctldir_snaps) + 2;
398 stat->ctime = stat->mtime = dmu_objset_snap_cmtime(zsb->z_os);
399 stat->atime = CURRENT_TIME;
406 * The '.zfs/snapshot' directory file operations. These mainly control
407 * generating the list of available snapshots when doing an 'ls' in the
408 * directory. See zpl_snapdir_readdir().
410 const struct file_operations zpl_fops_snapdir = {
411 .open = zpl_common_open,
412 .llseek = generic_file_llseek,
413 .read = generic_read_dir,
414 .readdir = zpl_snapdir_readdir,
418 * The '.zfs/snapshot' directory inode operations. These mainly control
419 * creating an inode for a snapshot directory and initializing the needed
420 * infrastructure to automount the snapshot. See zpl_snapdir_lookup().
422 const struct inode_operations zpl_ops_snapdir = {
423 .lookup = zpl_snapdir_lookup,
424 .getattr = zpl_snapdir_getattr,
425 .rename = zpl_snapdir_rename,
426 .rmdir = zpl_snapdir_rmdir,
427 .mkdir = zpl_snapdir_mkdir,
430 static struct dentry *
431 #ifdef HAVE_LOOKUP_NAMEIDATA
432 zpl_shares_lookup(struct inode *dip, struct dentry *dentry,
433 struct nameidata *nd)
435 zpl_shares_lookup(struct inode *dip, struct dentry *dentry,
440 struct inode *ip = NULL;
444 error = -zfsctl_shares_lookup(dip, dname(dentry), &ip,
446 ASSERT3S(error, <=, 0);
450 if (error == -ENOENT)
451 return d_splice_alias(NULL, dentry);
453 return ERR_PTR(error);
456 return d_splice_alias(ip, dentry);
461 zpl_shares_readdir(struct file *filp, void *dirent, filldir_t filldir)
464 struct dentry *dentry = filp->f_path.dentry;
465 struct inode *ip = dentry->d_inode;
466 zfs_sb_t *zsb = ITOZSB(ip);
472 if (zsb->z_shares_dir == 0) {
473 error = zpl_common_readdir(filp, dirent, filldir);
478 error = -zfs_zget(zsb, zsb->z_shares_dir, &dzp);
485 error = -zfs_readdir(ZTOI(dzp), dirent, filldir, &filp->f_pos, cr);
490 ASSERT3S(error, <=, 0);
497 zpl_shares_getattr(struct vfsmount *mnt, struct dentry *dentry,
500 struct inode *ip = dentry->d_inode;
501 zfs_sb_t *zsb = ITOZSB(ip);
507 if (zsb->z_shares_dir == 0) {
508 error = simple_getattr(mnt, dentry, stat);
509 stat->nlink = stat->size = 2;
510 stat->atime = CURRENT_TIME;
515 error = -zfs_zget(zsb, zsb->z_shares_dir, &dzp);
517 error = -zfs_getattr_fast(dentry->d_inode, stat);
521 ASSERT3S(error, <=, 0);
527 * The '.zfs/shares' directory file operations.
529 const struct file_operations zpl_fops_shares = {
530 .open = zpl_common_open,
531 .llseek = generic_file_llseek,
532 .read = generic_read_dir,
533 .readdir = zpl_shares_readdir,
537 * The '.zfs/shares' directory inode operations.
539 const struct inode_operations zpl_ops_shares = {
540 .lookup = zpl_shares_lookup,
541 .getattr = zpl_shares_getattr,