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.
26 #include <sys/zfs_vfsops.h>
27 #include <sys/zfs_vnops.h>
28 #include <sys/zfs_znode.h>
29 #include <sys/zfs_ctldir.h>
34 zpl_inode_alloc(struct super_block
*sb
)
38 VERIFY3S(zfs_inode_alloc(sb
, &ip
), ==, 0);
45 zpl_inode_destroy(struct inode
*ip
)
47 ASSERT(atomic_read(&ip
->i_count
) == 0);
48 zfs_inode_destroy(ip
);
52 * Called from __mark_inode_dirty() to reflect that something in the
53 * inode has changed. We use it to ensure the znode system attributes
54 * are always strictly update to date with respect to the inode.
56 #ifdef HAVE_DIRTY_INODE_WITH_FLAGS
58 zpl_dirty_inode(struct inode
*ip
, int flags
)
60 fstrans_cookie_t cookie
;
62 cookie
= spl_fstrans_mark();
63 zfs_dirty_inode(ip
, flags
);
64 spl_fstrans_unmark(cookie
);
68 zpl_dirty_inode(struct inode
*ip
)
70 fstrans_cookie_t cookie
;
72 cookie
= spl_fstrans_mark();
73 zfs_dirty_inode(ip
, 0);
74 spl_fstrans_unmark(cookie
);
76 #endif /* HAVE_DIRTY_INODE_WITH_FLAGS */
79 * When ->drop_inode() is called its return value indicates if the
80 * inode should be evicted from the inode cache. If the inode is
81 * unhashed and has no links the default policy is to evict it
84 * Prior to 2.6.36 this eviction was accomplished by the vfs calling
85 * ->delete_inode(). It was ->delete_inode()'s responsibility to
86 * truncate the inode pages and call clear_inode(). The call to
87 * clear_inode() synchronously invalidates all the buffers and
88 * calls ->clear_inode(). It was ->clear_inode()'s responsibility
89 * to cleanup and filesystem specific data before freeing the inode.
91 * This elaborate mechanism was replaced by ->evict_inode() which
92 * does the job of both ->delete_inode() and ->clear_inode(). It
93 * will be called exactly once, and when it returns the inode must
94 * be in a state where it can simply be freed.i
96 * The ->evict_inode() callback must minimally truncate the inode pages,
97 * and call clear_inode(). For 2.6.35 and later kernels this will
98 * simply update the inode state, with the sync occurring before the
99 * truncate in evict(). For earlier kernels clear_inode() maps to
100 * end_writeback() which is responsible for completing all outstanding
101 * write back. In either case, once this is done it is safe to cleanup
102 * any remaining inode specific data via zfs_inactive().
103 * remaining filesystem specific data.
105 #ifdef HAVE_EVICT_INODE
107 zpl_evict_inode(struct inode
*ip
)
109 fstrans_cookie_t cookie
;
111 cookie
= spl_fstrans_mark();
112 truncate_setsize(ip
, 0);
115 spl_fstrans_unmark(cookie
);
121 zpl_drop_inode(struct inode
*ip
)
123 generic_delete_inode(ip
);
127 zpl_clear_inode(struct inode
*ip
)
129 fstrans_cookie_t cookie
;
131 cookie
= spl_fstrans_mark();
133 spl_fstrans_unmark(cookie
);
137 zpl_inode_delete(struct inode
*ip
)
139 truncate_setsize(ip
, 0);
142 #endif /* HAVE_EVICT_INODE */
145 zpl_put_super(struct super_block
*sb
)
147 fstrans_cookie_t cookie
;
150 cookie
= spl_fstrans_mark();
151 error
= -zfs_umount(sb
);
152 spl_fstrans_unmark(cookie
);
153 ASSERT3S(error
, <=, 0);
157 zpl_sync_fs(struct super_block
*sb
, int wait
)
159 fstrans_cookie_t cookie
;
164 cookie
= spl_fstrans_mark();
165 error
= -zfs_sync(sb
, wait
, cr
);
166 spl_fstrans_unmark(cookie
);
168 ASSERT3S(error
, <=, 0);
174 zpl_statfs(struct dentry
*dentry
, struct kstatfs
*statp
)
176 fstrans_cookie_t cookie
;
179 cookie
= spl_fstrans_mark();
180 error
= -zfs_statvfs(dentry
, statp
);
181 spl_fstrans_unmark(cookie
);
182 ASSERT3S(error
, <=, 0);
188 zpl_remount_fs(struct super_block
*sb
, int *flags
, char *data
)
190 fstrans_cookie_t cookie
;
193 cookie
= spl_fstrans_mark();
194 error
= -zfs_remount(sb
, flags
, data
);
195 spl_fstrans_unmark(cookie
);
196 ASSERT3S(error
, <=, 0);
202 zpl_umount_begin(struct super_block
*sb
)
204 zfs_sb_t
*zsb
= sb
->s_fs_info
;
208 * Best effort to unmount snapshots in .zfs/snapshot/. Normally this
209 * isn't required because snapshots have the MNT_SHRINKABLE flag set.
212 (void) zfsctl_unmount_snapshots(zsb
, MNT_FORCE
, &count
);
216 * ZFS specific features must be explicitly handled here, the VFS will
217 * automatically handled the following generic functionality.
231 __zpl_show_options(struct seq_file
*seq
, zfs_sb_t
*zsb
)
233 seq_printf(seq
, ",%s", zsb
->z_flags
& ZSB_XATTR
? "xattr" : "noxattr");
235 #ifdef CONFIG_FS_POSIX_ACL
236 switch (zsb
->z_acl_type
) {
237 case ZFS_ACLTYPE_POSIXACL
:
238 seq_puts(seq
, ",posixacl");
241 seq_puts(seq
, ",noacl");
244 #endif /* CONFIG_FS_POSIX_ACL */
249 #ifdef HAVE_SHOW_OPTIONS_WITH_DENTRY
251 zpl_show_options(struct seq_file
*seq
, struct dentry
*root
)
253 return (__zpl_show_options(seq
, root
->d_sb
->s_fs_info
));
257 zpl_show_options(struct seq_file
*seq
, struct vfsmount
*vfsp
)
259 return (__zpl_show_options(seq
, vfsp
->mnt_sb
->s_fs_info
));
261 #endif /* HAVE_SHOW_OPTIONS_WITH_DENTRY */
264 zpl_fill_super(struct super_block
*sb
, void *data
, int silent
)
266 fstrans_cookie_t cookie
;
269 cookie
= spl_fstrans_mark();
270 error
= -zfs_domount(sb
, data
, silent
);
271 spl_fstrans_unmark(cookie
);
272 ASSERT3S(error
, <=, 0);
277 #ifdef HAVE_MOUNT_NODEV
278 static struct dentry
*
279 zpl_mount(struct file_system_type
*fs_type
, int flags
,
280 const char *osname
, void *data
)
282 zpl_mount_data_t zmd
= { osname
, data
};
284 return (mount_nodev(fs_type
, flags
, &zmd
, zpl_fill_super
));
288 zpl_get_sb(struct file_system_type
*fs_type
, int flags
,
289 const char *osname
, void *data
, struct vfsmount
*mnt
)
291 zpl_mount_data_t zmd
= { osname
, data
};
293 return (get_sb_nodev(fs_type
, flags
, &zmd
, zpl_fill_super
, mnt
));
295 #endif /* HAVE_MOUNT_NODEV */
298 zpl_kill_sb(struct super_block
*sb
)
303 #ifdef HAVE_S_INSTANCES_LIST_HEAD
304 sb
->s_instances
.next
= &(zpl_fs_type
.fs_supers
);
305 #endif /* HAVE_S_INSTANCES_LIST_HEAD */
309 zpl_prune_sb(int64_t nr_to_scan
, void *arg
)
311 struct super_block
*sb
= (struct super_block
*)arg
;
314 (void) -zfs_sb_prune(sb
, nr_to_scan
, &objects
);
317 #ifdef HAVE_NR_CACHED_OBJECTS
319 zpl_nr_cached_objects(struct super_block
*sb
)
321 zfs_sb_t
*zsb
= sb
->s_fs_info
;
324 mutex_enter(&zsb
->z_znodes_lock
);
325 nr
= zsb
->z_nr_znodes
;
326 mutex_exit(&zsb
->z_znodes_lock
);
330 #endif /* HAVE_NR_CACHED_OBJECTS */
332 #ifdef HAVE_FREE_CACHED_OBJECTS
334 * Attempt to evict some meta data from the cache. The ARC operates in
335 * terms of bytes while the Linux VFS uses objects. Now because this is
336 * just a best effort eviction and the exact values aren't critical so we
337 * extrapolate from an object count to a byte size using the znode_t size.
340 zpl_free_cached_objects(struct super_block
*sb
, int nr_to_scan
)
344 #endif /* HAVE_FREE_CACHED_OBJECTS */
346 const struct super_operations zpl_super_operations
= {
347 .alloc_inode
= zpl_inode_alloc
,
348 .destroy_inode
= zpl_inode_destroy
,
349 .dirty_inode
= zpl_dirty_inode
,
351 #ifdef HAVE_EVICT_INODE
352 .evict_inode
= zpl_evict_inode
,
354 .drop_inode
= zpl_drop_inode
,
355 .clear_inode
= zpl_clear_inode
,
356 .delete_inode
= zpl_inode_delete
,
357 #endif /* HAVE_EVICT_INODE */
358 .put_super
= zpl_put_super
,
359 .sync_fs
= zpl_sync_fs
,
360 .statfs
= zpl_statfs
,
361 .remount_fs
= zpl_remount_fs
,
362 .umount_begin
= zpl_umount_begin
,
363 .show_options
= zpl_show_options
,
365 #ifdef HAVE_NR_CACHED_OBJECTS
366 .nr_cached_objects
= zpl_nr_cached_objects
,
367 #endif /* HAVE_NR_CACHED_OBJECTS */
368 #ifdef HAVE_FREE_CACHED_OBJECTS
369 .free_cached_objects
= zpl_free_cached_objects
,
370 #endif /* HAVE_FREE_CACHED_OBJECTS */
373 struct file_system_type zpl_fs_type
= {
374 .owner
= THIS_MODULE
,
376 #ifdef HAVE_MOUNT_NODEV
379 .get_sb
= zpl_get_sb
,
380 #endif /* HAVE_MOUNT_NODEV */
381 .kill_sb
= zpl_kill_sb
,