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);
39 inode_set_iversion(ip
, 1);
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);
185 * If required by a 32-bit system call, dynamically scale the
186 * block size up to 16MiB and decrease the block counts. This
187 * allows for a maximum size of 64EiB to be reported. The file
188 * counts must be artificially capped at 2^32-1.
190 if (unlikely(zpl_is_32bit_api())) {
191 while (statp
->f_blocks
> UINT32_MAX
&&
192 statp
->f_bsize
< SPA_MAXBLOCKSIZE
) {
193 statp
->f_frsize
<<= 1;
194 statp
->f_bsize
<<= 1;
196 statp
->f_blocks
>>= 1;
197 statp
->f_bfree
>>= 1;
198 statp
->f_bavail
>>= 1;
201 uint64_t usedobjs
= statp
->f_files
- statp
->f_ffree
;
202 statp
->f_ffree
= MIN(statp
->f_ffree
, UINT32_MAX
- usedobjs
);
203 statp
->f_files
= statp
->f_ffree
+ usedobjs
;
210 zpl_remount_fs(struct super_block
*sb
, int *flags
, char *data
)
212 zfs_mnt_t zm
= { .mnt_osname
= NULL
, .mnt_data
= data
};
213 fstrans_cookie_t cookie
;
216 cookie
= spl_fstrans_mark();
217 error
= -zfs_remount(sb
, flags
, &zm
);
218 spl_fstrans_unmark(cookie
);
219 ASSERT3S(error
, <=, 0);
225 __zpl_show_options(struct seq_file
*seq
, zfsvfs_t
*zfsvfs
)
227 seq_printf(seq
, ",%s",
228 zfsvfs
->z_flags
& ZSB_XATTR
? "xattr" : "noxattr");
230 #ifdef CONFIG_FS_POSIX_ACL
231 switch (zfsvfs
->z_acl_type
) {
232 case ZFS_ACLTYPE_POSIXACL
:
233 seq_puts(seq
, ",posixacl");
236 seq_puts(seq
, ",noacl");
239 #endif /* CONFIG_FS_POSIX_ACL */
244 #ifdef HAVE_SHOW_OPTIONS_WITH_DENTRY
246 zpl_show_options(struct seq_file
*seq
, struct dentry
*root
)
248 return (__zpl_show_options(seq
, root
->d_sb
->s_fs_info
));
252 zpl_show_options(struct seq_file
*seq
, struct vfsmount
*vfsp
)
254 return (__zpl_show_options(seq
, vfsp
->mnt_sb
->s_fs_info
));
256 #endif /* HAVE_SHOW_OPTIONS_WITH_DENTRY */
259 zpl_fill_super(struct super_block
*sb
, void *data
, int silent
)
261 zfs_mnt_t
*zm
= (zfs_mnt_t
*)data
;
262 fstrans_cookie_t cookie
;
265 cookie
= spl_fstrans_mark();
266 error
= -zfs_domount(sb
, zm
, silent
);
267 spl_fstrans_unmark(cookie
);
268 ASSERT3S(error
, <=, 0);
274 zpl_test_super(struct super_block
*s
, void *data
)
276 zfsvfs_t
*zfsvfs
= s
->s_fs_info
;
282 return (os
== zfsvfs
->z_os
);
285 static struct super_block
*
286 zpl_mount_impl(struct file_system_type
*fs_type
, int flags
, zfs_mnt_t
*zm
)
288 struct super_block
*s
;
292 err
= dmu_objset_hold(zm
->mnt_osname
, FTAG
, &os
);
294 return (ERR_PTR(-err
));
297 * The dsl pool lock must be released prior to calling sget().
298 * It is possible sget() may block on the lock in grab_super()
299 * while deactivate_super() holds that same lock and waits for
300 * a txg sync. If the dsl_pool lock is held over over sget()
301 * this can prevent the pool sync and cause a deadlock.
303 dsl_pool_rele(dmu_objset_pool(os
), FTAG
);
304 s
= zpl_sget(fs_type
, zpl_test_super
, set_anon_super
, flags
, os
);
305 dsl_dataset_rele(dmu_objset_ds(os
), FTAG
);
308 return (ERR_CAST(s
));
310 if (s
->s_root
== NULL
) {
311 err
= zpl_fill_super(s
, zm
, flags
& SB_SILENT
? 1 : 0);
313 deactivate_locked_super(s
);
314 return (ERR_PTR(err
));
316 s
->s_flags
|= SB_ACTIVE
;
317 } else if ((flags
^ s
->s_flags
) & SB_RDONLY
) {
318 deactivate_locked_super(s
);
319 return (ERR_PTR(-EBUSY
));
325 #ifdef HAVE_FST_MOUNT
326 static struct dentry
*
327 zpl_mount(struct file_system_type
*fs_type
, int flags
,
328 const char *osname
, void *data
)
330 zfs_mnt_t zm
= { .mnt_osname
= osname
, .mnt_data
= data
};
332 struct super_block
*sb
= zpl_mount_impl(fs_type
, flags
, &zm
);
334 return (ERR_CAST(sb
));
336 return (dget(sb
->s_root
));
340 zpl_get_sb(struct file_system_type
*fs_type
, int flags
,
341 const char *osname
, void *data
, struct vfsmount
*mnt
)
343 zfs_mnt_t zm
= { .mnt_osname
= osname
, .mnt_data
= data
};
345 struct super_block
*sb
= zpl_mount_impl(fs_type
, flags
, &zm
);
347 return (PTR_ERR(sb
));
349 (void) simple_set_mnt(mnt
, sb
);
353 #endif /* HAVE_FST_MOUNT */
356 zpl_kill_sb(struct super_block
*sb
)
361 #ifdef HAVE_S_INSTANCES_LIST_HEAD
362 sb
->s_instances
.next
= &(zpl_fs_type
.fs_supers
);
363 #endif /* HAVE_S_INSTANCES_LIST_HEAD */
367 zpl_prune_sb(int64_t nr_to_scan
, void *arg
)
369 struct super_block
*sb
= (struct super_block
*)arg
;
372 (void) -zfs_prune(sb
, nr_to_scan
, &objects
);
375 #ifdef HAVE_NR_CACHED_OBJECTS
377 zpl_nr_cached_objects(struct super_block
*sb
)
381 #endif /* HAVE_NR_CACHED_OBJECTS */
383 #ifdef HAVE_FREE_CACHED_OBJECTS
385 zpl_free_cached_objects(struct super_block
*sb
, int nr_to_scan
)
389 #endif /* HAVE_FREE_CACHED_OBJECTS */
391 const struct super_operations zpl_super_operations
= {
392 .alloc_inode
= zpl_inode_alloc
,
393 .destroy_inode
= zpl_inode_destroy
,
394 .dirty_inode
= zpl_dirty_inode
,
396 #ifdef HAVE_EVICT_INODE
397 .evict_inode
= zpl_evict_inode
,
399 .drop_inode
= zpl_drop_inode
,
400 .clear_inode
= zpl_clear_inode
,
401 .delete_inode
= zpl_inode_delete
,
402 #endif /* HAVE_EVICT_INODE */
403 .put_super
= zpl_put_super
,
404 .sync_fs
= zpl_sync_fs
,
405 .statfs
= zpl_statfs
,
406 .remount_fs
= zpl_remount_fs
,
407 .show_options
= zpl_show_options
,
409 #ifdef HAVE_NR_CACHED_OBJECTS
410 .nr_cached_objects
= zpl_nr_cached_objects
,
411 #endif /* HAVE_NR_CACHED_OBJECTS */
412 #ifdef HAVE_FREE_CACHED_OBJECTS
413 .free_cached_objects
= zpl_free_cached_objects
,
414 #endif /* HAVE_FREE_CACHED_OBJECTS */
417 struct file_system_type zpl_fs_type
= {
418 .owner
= THIS_MODULE
,
420 #ifdef HAVE_FST_MOUNT
423 .get_sb
= zpl_get_sb
,
424 #endif /* HAVE_FST_MOUNT */
425 .kill_sb
= zpl_kill_sb
,