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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
3 | * Copyright (C) 2004-2005 Red Hat, Inc. All rights reserved. | |
4 | * | |
5 | * This copyrighted material is made available to anyone wishing to use, | |
6 | * modify, copy, or redistribute it subject to the terms and conditions | |
7 | * of the GNU General Public License v.2. | |
8 | */ | |
9 | ||
10 | #include <linux/sched.h> | |
11 | #include <linux/slab.h> | |
12 | #include <linux/spinlock.h> | |
13 | #include <linux/completion.h> | |
14 | #include <linux/buffer_head.h> | |
15 | #include <linux/vmalloc.h> | |
16 | #include <linux/statfs.h> | |
17 | #include <linux/seq_file.h> | |
18 | #include <linux/mount.h> | |
19 | #include <linux/kthread.h> | |
20 | #include <linux/delay.h> | |
21 | #include <asm/semaphore.h> | |
22 | ||
23 | #include "gfs2.h" | |
24 | #include "glock.h" | |
25 | #include "inode.h" | |
26 | #include "lm.h" | |
27 | #include "log.h" | |
28 | #include "mount.h" | |
29 | #include "ops_super.h" | |
30 | #include "page.h" | |
31 | #include "quota.h" | |
32 | #include "recovery.h" | |
33 | #include "rgrp.h" | |
34 | #include "super.h" | |
35 | #include "sys.h" | |
36 | ||
37 | /** | |
38 | * gfs2_write_inode - Make sure the inode is stable on the disk | |
39 | * @inode: The inode | |
40 | * @sync: synchronous write flag | |
41 | * | |
42 | * Returns: errno | |
43 | */ | |
44 | ||
45 | static int gfs2_write_inode(struct inode *inode, int sync) | |
46 | { | |
47 | struct gfs2_inode *ip = get_v2ip(inode); | |
48 | ||
49 | atomic_inc(&ip->i_sbd->sd_ops_super); | |
50 | ||
51 | if (current->flags & PF_MEMALLOC) | |
52 | return 0; | |
53 | if (ip && sync) | |
54 | gfs2_log_flush_glock(ip->i_gl); | |
55 | ||
56 | return 0; | |
57 | } | |
58 | ||
59 | /** | |
60 | * gfs2_put_super - Unmount the filesystem | |
61 | * @sb: The VFS superblock | |
62 | * | |
63 | */ | |
64 | ||
65 | static void gfs2_put_super(struct super_block *sb) | |
66 | { | |
67 | struct gfs2_sbd *sdp = get_v2sdp(sb); | |
68 | int error; | |
69 | ||
70 | if (!sdp) | |
71 | return; | |
72 | ||
73 | atomic_inc(&sdp->sd_ops_super); | |
74 | ||
75 | /* Unfreeze the filesystem, if we need to */ | |
76 | ||
77 | down(&sdp->sd_freeze_lock); | |
78 | if (sdp->sd_freeze_count) | |
79 | gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); | |
80 | up(&sdp->sd_freeze_lock); | |
81 | ||
82 | kthread_stop(sdp->sd_inoded_process); | |
83 | kthread_stop(sdp->sd_quotad_process); | |
84 | kthread_stop(sdp->sd_logd_process); | |
85 | kthread_stop(sdp->sd_recoverd_process); | |
86 | while (sdp->sd_glockd_num--) | |
87 | kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]); | |
88 | kthread_stop(sdp->sd_scand_process); | |
89 | ||
90 | if (!(sb->s_flags & MS_RDONLY)) { | |
91 | error = gfs2_make_fs_ro(sdp); | |
92 | if (error) | |
93 | gfs2_io_error(sdp); | |
94 | } | |
95 | ||
96 | /* At this point, we're through modifying the disk */ | |
97 | ||
98 | /* Release stuff */ | |
99 | ||
100 | gfs2_inode_put(sdp->sd_master_dir); | |
101 | gfs2_inode_put(sdp->sd_jindex); | |
102 | gfs2_inode_put(sdp->sd_inum_inode); | |
103 | gfs2_inode_put(sdp->sd_statfs_inode); | |
104 | gfs2_inode_put(sdp->sd_rindex); | |
105 | gfs2_inode_put(sdp->sd_quota_inode); | |
106 | gfs2_inode_put(sdp->sd_root_dir); | |
107 | ||
108 | gfs2_glock_put(sdp->sd_rename_gl); | |
109 | gfs2_glock_put(sdp->sd_trans_gl); | |
110 | ||
111 | if (!sdp->sd_args.ar_spectator) { | |
112 | gfs2_glock_dq_uninit(&sdp->sd_journal_gh); | |
113 | gfs2_glock_dq_uninit(&sdp->sd_jinode_gh); | |
114 | gfs2_glock_dq_uninit(&sdp->sd_ir_gh); | |
115 | gfs2_glock_dq_uninit(&sdp->sd_sc_gh); | |
116 | gfs2_glock_dq_uninit(&sdp->sd_ut_gh); | |
117 | gfs2_glock_dq_uninit(&sdp->sd_qc_gh); | |
118 | gfs2_inode_put(sdp->sd_ir_inode); | |
119 | gfs2_inode_put(sdp->sd_sc_inode); | |
120 | gfs2_inode_put(sdp->sd_ut_inode); | |
121 | gfs2_inode_put(sdp->sd_qc_inode); | |
122 | } | |
123 | ||
124 | gfs2_glock_dq_uninit(&sdp->sd_live_gh); | |
125 | ||
126 | gfs2_clear_rgrpd(sdp); | |
127 | gfs2_jindex_free(sdp); | |
128 | ||
129 | /* Take apart glock structures and buffer lists */ | |
130 | gfs2_gl_hash_clear(sdp, WAIT); | |
131 | ||
132 | /* Unmount the locking protocol */ | |
133 | gfs2_lm_unmount(sdp); | |
134 | ||
135 | /* At this point, we're through participating in the lockspace */ | |
136 | ||
137 | gfs2_sys_fs_del(sdp); | |
138 | ||
139 | /* Get rid of any extra inodes */ | |
140 | while (invalidate_inodes(sb)) | |
141 | yield(); | |
142 | ||
143 | vfree(sdp); | |
144 | ||
145 | set_v2sdp(sb, NULL); | |
146 | } | |
147 | ||
148 | /** | |
149 | * gfs2_write_super - disk commit all incore transactions | |
150 | * @sb: the filesystem | |
151 | * | |
152 | * This function is called every time sync(2) is called. | |
153 | * After this exits, all dirty buffers and synced. | |
154 | */ | |
155 | ||
156 | static void gfs2_write_super(struct super_block *sb) | |
157 | { | |
158 | struct gfs2_sbd *sdp = get_v2sdp(sb); | |
159 | atomic_inc(&sdp->sd_ops_super); | |
160 | gfs2_log_flush(sdp); | |
161 | } | |
162 | ||
163 | /** | |
164 | * gfs2_write_super_lockfs - prevent further writes to the filesystem | |
165 | * @sb: the VFS structure for the filesystem | |
166 | * | |
167 | */ | |
168 | ||
169 | static void gfs2_write_super_lockfs(struct super_block *sb) | |
170 | { | |
171 | struct gfs2_sbd *sdp = get_v2sdp(sb); | |
172 | int error; | |
173 | ||
174 | atomic_inc(&sdp->sd_ops_super); | |
175 | ||
176 | for (;;) { | |
177 | error = gfs2_freeze_fs(sdp); | |
178 | if (!error) | |
179 | break; | |
180 | ||
181 | switch (error) { | |
182 | case -EBUSY: | |
183 | fs_err(sdp, "waiting for recovery before freeze\n"); | |
184 | break; | |
185 | ||
186 | default: | |
187 | fs_err(sdp, "error freezing FS: %d\n", error); | |
188 | break; | |
189 | } | |
190 | ||
191 | fs_err(sdp, "retrying...\n"); | |
192 | msleep(1000); | |
193 | } | |
194 | } | |
195 | ||
196 | /** | |
197 | * gfs2_unlockfs - reallow writes to the filesystem | |
198 | * @sb: the VFS structure for the filesystem | |
199 | * | |
200 | */ | |
201 | ||
202 | static void gfs2_unlockfs(struct super_block *sb) | |
203 | { | |
204 | struct gfs2_sbd *sdp = get_v2sdp(sb); | |
205 | ||
206 | atomic_inc(&sdp->sd_ops_super); | |
207 | gfs2_unfreeze_fs(sdp); | |
208 | } | |
209 | ||
210 | /** | |
211 | * gfs2_statfs - Gather and return stats about the filesystem | |
212 | * @sb: The superblock | |
213 | * @statfsbuf: The buffer | |
214 | * | |
215 | * Returns: 0 on success or error code | |
216 | */ | |
217 | ||
218 | static int gfs2_statfs(struct super_block *sb, struct kstatfs *buf) | |
219 | { | |
220 | struct gfs2_sbd *sdp = get_v2sdp(sb); | |
221 | struct gfs2_statfs_change sc; | |
222 | int error; | |
223 | ||
224 | atomic_inc(&sdp->sd_ops_super); | |
225 | ||
226 | if (gfs2_tune_get(sdp, gt_statfs_slow)) | |
227 | error = gfs2_statfs_slow(sdp, &sc); | |
228 | else | |
229 | error = gfs2_statfs_i(sdp, &sc); | |
230 | ||
231 | if (error) | |
232 | return error; | |
233 | ||
234 | memset(buf, 0, sizeof(struct kstatfs)); | |
235 | ||
236 | buf->f_type = GFS2_MAGIC; | |
237 | buf->f_bsize = sdp->sd_sb.sb_bsize; | |
238 | buf->f_blocks = sc.sc_total; | |
239 | buf->f_bfree = sc.sc_free; | |
240 | buf->f_bavail = sc.sc_free; | |
241 | buf->f_files = sc.sc_dinodes + sc.sc_free; | |
242 | buf->f_ffree = sc.sc_free; | |
243 | buf->f_namelen = GFS2_FNAMESIZE; | |
244 | ||
245 | return 0; | |
246 | } | |
247 | ||
248 | /** | |
249 | * gfs2_remount_fs - called when the FS is remounted | |
250 | * @sb: the filesystem | |
251 | * @flags: the remount flags | |
252 | * @data: extra data passed in (not used right now) | |
253 | * | |
254 | * Returns: errno | |
255 | */ | |
256 | ||
257 | static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data) | |
258 | { | |
259 | struct gfs2_sbd *sdp = get_v2sdp(sb); | |
260 | int error; | |
261 | ||
262 | atomic_inc(&sdp->sd_ops_super); | |
263 | ||
264 | error = gfs2_mount_args(sdp, data, 1); | |
265 | if (error) | |
266 | return error; | |
267 | ||
268 | if (sdp->sd_args.ar_spectator) | |
269 | *flags |= MS_RDONLY; | |
270 | else { | |
271 | if (*flags & MS_RDONLY) { | |
272 | if (!(sb->s_flags & MS_RDONLY)) | |
273 | error = gfs2_make_fs_ro(sdp); | |
274 | } else if (!(*flags & MS_RDONLY) && | |
275 | (sb->s_flags & MS_RDONLY)) { | |
276 | error = gfs2_make_fs_rw(sdp); | |
277 | } | |
278 | } | |
279 | ||
280 | if (*flags & (MS_NOATIME | MS_NODIRATIME)) | |
281 | set_bit(SDF_NOATIME, &sdp->sd_flags); | |
282 | else | |
283 | clear_bit(SDF_NOATIME, &sdp->sd_flags); | |
284 | ||
285 | /* Don't let the VFS update atimes. GFS2 handles this itself. */ | |
286 | *flags |= MS_NOATIME | MS_NODIRATIME; | |
287 | ||
288 | return error; | |
289 | } | |
290 | ||
291 | /** | |
292 | * gfs2_clear_inode - Deallocate an inode when VFS is done with it | |
293 | * @inode: The VFS inode | |
294 | * | |
295 | */ | |
296 | ||
297 | static void gfs2_clear_inode(struct inode *inode) | |
298 | { | |
299 | struct gfs2_inode *ip = get_v2ip(inode); | |
300 | ||
301 | atomic_inc(&get_v2sdp(inode->i_sb)->sd_ops_super); | |
302 | ||
303 | if (ip) { | |
304 | spin_lock(&ip->i_spin); | |
305 | ip->i_vnode = NULL; | |
306 | set_v2ip(inode, NULL); | |
307 | spin_unlock(&ip->i_spin); | |
308 | ||
309 | gfs2_glock_schedule_for_reclaim(ip->i_gl); | |
310 | gfs2_inode_put(ip); | |
311 | } | |
312 | } | |
313 | ||
314 | /** | |
315 | * gfs2_show_options - Show mount options for /proc/mounts | |
316 | * @s: seq_file structure | |
317 | * @mnt: vfsmount | |
318 | * | |
319 | * Returns: 0 on success or error code | |
320 | */ | |
321 | ||
322 | static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt) | |
323 | { | |
324 | struct gfs2_sbd *sdp = get_v2sdp(mnt->mnt_sb); | |
325 | struct gfs2_args *args = &sdp->sd_args; | |
326 | ||
327 | atomic_inc(&sdp->sd_ops_super); | |
328 | ||
329 | if (args->ar_lockproto[0]) | |
330 | seq_printf(s, ",lockproto=%s", args->ar_lockproto); | |
331 | if (args->ar_locktable[0]) | |
332 | seq_printf(s, ",locktable=%s", args->ar_locktable); | |
333 | if (args->ar_hostdata[0]) | |
334 | seq_printf(s, ",hostdata=%s", args->ar_hostdata); | |
335 | if (args->ar_spectator) | |
336 | seq_printf(s, ",spectator"); | |
337 | if (args->ar_ignore_local_fs) | |
338 | seq_printf(s, ",ignore_local_fs"); | |
339 | if (args->ar_localflocks) | |
340 | seq_printf(s, ",localflocks"); | |
341 | if (args->ar_localcaching) | |
342 | seq_printf(s, ",localcaching"); | |
343 | if (args->ar_debug) | |
344 | seq_printf(s, ",debug"); | |
345 | if (args->ar_upgrade) | |
346 | seq_printf(s, ",upgrade"); | |
347 | if (args->ar_num_glockd != GFS2_GLOCKD_DEFAULT) | |
348 | seq_printf(s, ",num_glockd=%u", args->ar_num_glockd); | |
349 | if (args->ar_posix_acl) | |
350 | seq_printf(s, ",acl"); | |
351 | if (args->ar_quota != GFS2_QUOTA_DEFAULT) { | |
352 | char *state; | |
353 | switch (args->ar_quota) { | |
354 | case GFS2_QUOTA_OFF: | |
355 | state = "off"; | |
356 | break; | |
357 | case GFS2_QUOTA_ACCOUNT: | |
358 | state = "account"; | |
359 | break; | |
360 | case GFS2_QUOTA_ON: | |
361 | state = "on"; | |
362 | break; | |
363 | default: | |
364 | state = "unknown"; | |
365 | break; | |
366 | } | |
367 | seq_printf(s, ",quota=%s", state); | |
368 | } | |
369 | if (args->ar_suiddir) | |
370 | seq_printf(s, ",suiddir"); | |
371 | if (args->ar_data != GFS2_DATA_DEFAULT) { | |
372 | char *state; | |
373 | switch (args->ar_data) { | |
374 | case GFS2_DATA_WRITEBACK: | |
375 | state = "writeback"; | |
376 | break; | |
377 | case GFS2_DATA_ORDERED: | |
378 | state = "ordered"; | |
379 | break; | |
380 | default: | |
381 | state = "unknown"; | |
382 | break; | |
383 | } | |
384 | seq_printf(s, ",data=%s", state); | |
385 | } | |
386 | ||
387 | return 0; | |
388 | } | |
389 | ||
390 | struct super_operations gfs2_super_ops = { | |
391 | .write_inode = gfs2_write_inode, | |
392 | .put_super = gfs2_put_super, | |
393 | .write_super = gfs2_write_super, | |
394 | .write_super_lockfs = gfs2_write_super_lockfs, | |
395 | .unlockfs = gfs2_unlockfs, | |
396 | .statfs = gfs2_statfs, | |
397 | .remount_fs = gfs2_remount_fs, | |
398 | .clear_inode = gfs2_clear_inode, | |
399 | .show_options = gfs2_show_options, | |
400 | }; | |
401 |