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 zfs_dirty_inode(ip
, flags
);
64 zpl_dirty_inode(struct inode
*ip
)
66 zfs_dirty_inode(ip
, 0);
68 #endif /* HAVE_DIRTY_INODE_WITH_FLAGS */
71 * When ->drop_inode() is called its return value indicates if the
72 * inode should be evicted from the inode cache. If the inode is
73 * unhashed and has no links the default policy is to evict it
76 * Prior to 2.6.36 this eviction was accomplished by the vfs calling
77 * ->delete_inode(). It was ->delete_inode()'s responsibility to
78 * truncate the inode pages and call clear_inode(). The call to
79 * clear_inode() synchronously invalidates all the buffers and
80 * calls ->clear_inode(). It was ->clear_inode()'s responsibility
81 * to cleanup and filesystem specific data before freeing the inode.
83 * This elaborate mechanism was replaced by ->evict_inode() which
84 * does the job of both ->delete_inode() and ->clear_inode(). It
85 * will be called exactly once, and when it returns the inode must
86 * be in a state where it can simply be freed.i
88 * The ->evict_inode() callback must minimally truncate the inode pages,
89 * and call clear_inode(). For 2.6.35 and later kernels this will
90 * simply update the inode state, with the sync occurring before the
91 * truncate in evict(). For earlier kernels clear_inode() maps to
92 * end_writeback() which is responsible for completing all outstanding
93 * write back. In either case, once this is done it is safe to cleanup
94 * any remaining inode specific data via zfs_inactive().
95 * remaining filesystem specific data.
97 #ifdef HAVE_EVICT_INODE
99 zpl_evict_inode(struct inode
*ip
)
101 truncate_setsize(ip
, 0);
109 zpl_clear_inode(struct inode
*ip
)
115 zpl_inode_delete(struct inode
*ip
)
117 truncate_setsize(ip
, 0);
121 #endif /* HAVE_EVICT_INODE */
124 zpl_put_super(struct super_block
*sb
)
128 error
= -zfs_umount(sb
);
129 ASSERT3S(error
, <=, 0);
133 zpl_sync_fs(struct super_block
*sb
, int wait
)
139 error
= -zfs_sync(sb
, wait
, cr
);
141 ASSERT3S(error
, <=, 0);
147 zpl_statfs(struct dentry
*dentry
, struct kstatfs
*statp
)
151 error
= -zfs_statvfs(dentry
, statp
);
152 ASSERT3S(error
, <=, 0);
158 zpl_remount_fs(struct super_block
*sb
, int *flags
, char *data
)
161 error
= -zfs_remount(sb
, flags
, data
);
162 ASSERT3S(error
, <=, 0);
168 zpl_umount_begin(struct super_block
*sb
)
170 zfs_sb_t
*zsb
= sb
->s_fs_info
;
174 * Best effort to unmount snapshots in .zfs/snapshot/. Normally this
175 * isn't required because snapshots have the MNT_SHRINKABLE flag set.
178 (void) zfsctl_unmount_snapshots(zsb
, MNT_FORCE
, &count
);
182 * ZFS specific features must be explicitly handled here, the VFS will
183 * automatically handled the following generic functionality.
197 __zpl_show_options(struct seq_file
*seq
, zfs_sb_t
*zsb
)
199 seq_printf(seq
, ",%s", zsb
->z_flags
& ZSB_XATTR
? "xattr" : "noxattr");
201 #ifdef CONFIG_FS_POSIX_ACL
202 switch (zsb
->z_acl_type
) {
203 case ZFS_ACLTYPE_POSIXACL
:
204 seq_puts(seq
, ",posixacl");
207 seq_puts(seq
, ",noacl");
210 #endif /* CONFIG_FS_POSIX_ACL */
215 #ifdef HAVE_SHOW_OPTIONS_WITH_DENTRY
217 zpl_show_options(struct seq_file
*seq
, struct dentry
*root
)
219 return (__zpl_show_options(seq
, root
->d_sb
->s_fs_info
));
223 zpl_show_options(struct seq_file
*seq
, struct vfsmount
*vfsp
)
225 return (__zpl_show_options(seq
, vfsp
->mnt_sb
->s_fs_info
));
227 #endif /* HAVE_SHOW_OPTIONS_WITH_DENTRY */
230 zpl_fill_super(struct super_block
*sb
, void *data
, int silent
)
234 error
= -zfs_domount(sb
, data
, silent
);
235 ASSERT3S(error
, <=, 0);
240 #ifdef HAVE_MOUNT_NODEV
241 static struct dentry
*
242 zpl_mount(struct file_system_type
*fs_type
, int flags
,
243 const char *osname
, void *data
)
245 zpl_mount_data_t zmd
= { osname
, data
};
247 return (mount_nodev(fs_type
, flags
, &zmd
, zpl_fill_super
));
251 zpl_get_sb(struct file_system_type
*fs_type
, int flags
,
252 const char *osname
, void *data
, struct vfsmount
*mnt
)
254 zpl_mount_data_t zmd
= { osname
, data
};
256 return (get_sb_nodev(fs_type
, flags
, &zmd
, zpl_fill_super
, mnt
));
258 #endif /* HAVE_MOUNT_NODEV */
261 zpl_kill_sb(struct super_block
*sb
)
266 #ifdef HAVE_S_INSTANCES_LIST_HEAD
267 sb
->s_instances
.next
= &(zpl_fs_type
.fs_supers
);
268 #endif /* HAVE_S_INSTANCES_LIST_HEAD */
273 * Linux 3.1 - 3.x API
275 * The Linux 3.1 API introduced per-sb cache shrinkers to replace the
276 * global ones. This allows us a mechanism to cleanly target a specific
277 * zfs file system when the dnode and inode caches grow too large.
279 * In addition, the 3.0 kernel added the iterate_supers_type() helper
280 * function which is used to safely walk all of the zfs file systems.
283 zpl_prune_sb(struct super_block
*sb
, void *arg
)
288 error
= -zfs_sb_prune(sb
, *(unsigned long *)arg
, &objects
);
289 ASSERT3S(error
, <=, 0);
293 zpl_prune_sbs(int64_t bytes_to_scan
, void *private)
295 unsigned long nr_to_scan
= (bytes_to_scan
/ sizeof (znode_t
));
297 iterate_supers_type(&zpl_fs_type
, zpl_prune_sb
, &nr_to_scan
);
302 * Linux 2.6.x - 3.0 API
304 * These are best effort interfaces are provided by the SPL to induce
305 * the Linux VM subsystem to reclaim a fraction of the both dnode and
306 * inode caches. Ideally, we want to just target the zfs file systems
307 * however our only option is to reclaim from them all.
310 zpl_prune_sbs(int64_t bytes_to_scan
, void *private)
312 unsigned long nr_to_scan
= (bytes_to_scan
/ sizeof (znode_t
));
314 shrink_dcache_memory(nr_to_scan
, GFP_KERNEL
);
315 shrink_icache_memory(nr_to_scan
, GFP_KERNEL
);
318 #endif /* HAVE_SHRINK */
320 #ifdef HAVE_NR_CACHED_OBJECTS
322 zpl_nr_cached_objects(struct super_block
*sb
)
324 zfs_sb_t
*zsb
= sb
->s_fs_info
;
327 mutex_enter(&zsb
->z_znodes_lock
);
328 nr
= zsb
->z_nr_znodes
;
329 mutex_exit(&zsb
->z_znodes_lock
);
333 #endif /* HAVE_NR_CACHED_OBJECTS */
335 #ifdef HAVE_FREE_CACHED_OBJECTS
337 * Attempt to evict some meta data from the cache. The ARC operates in
338 * terms of bytes while the Linux VFS uses objects. Now because this is
339 * just a best effort eviction and the exact values aren't critical so we
340 * extrapolate from an object count to a byte size using the znode_t size.
343 zpl_free_cached_objects(struct super_block
*sb
, int nr_to_scan
)
347 #endif /* HAVE_FREE_CACHED_OBJECTS */
349 const struct super_operations zpl_super_operations
= {
350 .alloc_inode
= zpl_inode_alloc
,
351 .destroy_inode
= zpl_inode_destroy
,
352 .dirty_inode
= zpl_dirty_inode
,
355 #ifdef HAVE_EVICT_INODE
356 .evict_inode
= zpl_evict_inode
,
358 .clear_inode
= zpl_clear_inode
,
359 .delete_inode
= zpl_inode_delete
,
360 #endif /* HAVE_EVICT_INODE */
361 .put_super
= zpl_put_super
,
362 .sync_fs
= zpl_sync_fs
,
363 .statfs
= zpl_statfs
,
364 .remount_fs
= zpl_remount_fs
,
365 .umount_begin
= zpl_umount_begin
,
366 .show_options
= zpl_show_options
,
368 #ifdef HAVE_NR_CACHED_OBJECTS
369 .nr_cached_objects
= zpl_nr_cached_objects
,
370 #endif /* HAVE_NR_CACHED_OBJECTS */
371 #ifdef HAVE_FREE_CACHED_OBJECTS
372 .free_cached_objects
= zpl_free_cached_objects
,
373 #endif /* HAVE_FREE_CACHED_OBJECTS */
376 struct file_system_type zpl_fs_type
= {
377 .owner
= THIS_MODULE
,
379 #ifdef HAVE_MOUNT_NODEV
382 .get_sb
= zpl_get_sb
,
383 #endif /* HAVE_MOUNT_NODEV */
384 .kill_sb
= zpl_kill_sb
,