1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2006 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 version 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/statfs.h>
16 #include <linux/seq_file.h>
17 #include <linux/mount.h>
18 #include <linux/kthread.h>
19 #include <linux/delay.h>
20 #include <linux/gfs2_ondisk.h>
21 #include <linux/crc32.h>
22 #include <linux/lm_interface.h>
23
24 #include "gfs2.h"
25 #include "incore.h"
26 #include "glock.h"
27 #include "inode.h"
28 #include "lm.h"
29 #include "log.h"
30 #include "mount.h"
31 #include "ops_super.h"
32 #include "quota.h"
33 #include "recovery.h"
34 #include "rgrp.h"
35 #include "super.h"
36 #include "sys.h"
37 #include "util.h"
38 #include "trans.h"
39 #include "dir.h"
40 #include "eattr.h"
41 #include "bmap.h"
42
43 /**
44 * gfs2_write_inode - Make sure the inode is stable on the disk
45 * @inode: The inode
46 * @sync: synchronous write flag
47 *
48 * Returns: errno
49 */
50
51 static int gfs2_write_inode(struct inode *inode, int sync)
52 {
53 struct gfs2_inode *ip = GFS2_I(inode);
54
55 /* Check this is a "normal" inode */
56 if (inode->i_private) {
57 if (current->flags & PF_MEMALLOC)
58 return 0;
59 if (sync)
60 gfs2_log_flush(GFS2_SB(inode), ip->i_gl);
61 }
62
63 return 0;
64 }
65
66 /**
67 * gfs2_put_super - Unmount the filesystem
68 * @sb: The VFS superblock
69 *
70 */
71
72 static void gfs2_put_super(struct super_block *sb)
73 {
74 struct gfs2_sbd *sdp = sb->s_fs_info;
75 int error;
76
77 if (!sdp)
78 return;
79
80 if (!strncmp(sb->s_type->name, "gfs2meta", 8))
81 return; /* Nothing to do */
82
83 /* Unfreeze the filesystem, if we need to */
84
85 mutex_lock(&sdp->sd_freeze_lock);
86 if (sdp->sd_freeze_count)
87 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
88 mutex_unlock(&sdp->sd_freeze_lock);
89
90 kthread_stop(sdp->sd_quotad_process);
91 kthread_stop(sdp->sd_logd_process);
92 kthread_stop(sdp->sd_recoverd_process);
93 while (sdp->sd_glockd_num--)
94 kthread_stop(sdp->sd_glockd_process[sdp->sd_glockd_num]);
95
96 if (!(sb->s_flags & MS_RDONLY)) {
97 error = gfs2_make_fs_ro(sdp);
98 if (error)
99 gfs2_io_error(sdp);
100 }
101 /* At this point, we're through modifying the disk */
102
103 /* Release stuff */
104
105 iput(sdp->sd_master_dir);
106 iput(sdp->sd_jindex);
107 iput(sdp->sd_inum_inode);
108 iput(sdp->sd_statfs_inode);
109 iput(sdp->sd_rindex);
110 iput(sdp->sd_quota_inode);
111
112 gfs2_glock_put(sdp->sd_rename_gl);
113 gfs2_glock_put(sdp->sd_trans_gl);
114
115 if (!sdp->sd_args.ar_spectator) {
116 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
117 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
118 gfs2_glock_dq_uninit(&sdp->sd_ir_gh);
119 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
120 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
121 iput(sdp->sd_ir_inode);
122 iput(sdp->sd_sc_inode);
123 iput(sdp->sd_qc_inode);
124 }
125
126 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
127 gfs2_clear_rgrpd(sdp);
128 gfs2_jindex_free(sdp);
129 /* Take apart glock structures and buffer lists */
130 gfs2_gl_hash_clear(sdp, WAIT);
131 /* Unmount the locking protocol */
132 gfs2_lm_unmount(sdp);
133
134 /* At this point, we're through participating in the lockspace */
135 gfs2_sys_fs_del(sdp);
136 kfree(sdp);
137 }
138
139 /**
140 * gfs2_write_super
141 * @sb: the superblock
142 *
143 */
144
145 static void gfs2_write_super(struct super_block *sb)
146 {
147 sb->s_dirt = 0;
148 }
149
150 /**
151 * gfs2_sync_fs - sync the filesystem
152 * @sb: the superblock
153 *
154 * Flushes the log to disk.
155 */
156 static int gfs2_sync_fs(struct super_block *sb, int wait)
157 {
158 sb->s_dirt = 0;
159 if (wait)
160 gfs2_log_flush(sb->s_fs_info, NULL);
161 return 0;
162 }
163
164 /**
165 * gfs2_write_super_lockfs - prevent further writes to the filesystem
166 * @sb: the VFS structure for the filesystem
167 *
168 */
169
170 static void gfs2_write_super_lockfs(struct super_block *sb)
171 {
172 struct gfs2_sbd *sdp = sb->s_fs_info;
173 int error;
174
175 if (test_bit(SDF_SHUTDOWN, &sdp->sd_flags))
176 return;
177
178 for (;;) {
179 error = gfs2_freeze_fs(sdp);
180 if (!error)
181 break;
182
183 switch (error) {
184 case -EBUSY:
185 fs_err(sdp, "waiting for recovery before freeze\n");
186 break;
187
188 default:
189 fs_err(sdp, "error freezing FS: %d\n", error);
190 break;
191 }
192
193 fs_err(sdp, "retrying...\n");
194 msleep(1000);
195 }
196 }
197
198 /**
199 * gfs2_unlockfs - reallow writes to the filesystem
200 * @sb: the VFS structure for the filesystem
201 *
202 */
203
204 static void gfs2_unlockfs(struct super_block *sb)
205 {
206 gfs2_unfreeze_fs(sb->s_fs_info);
207 }
208
209 /**
210 * gfs2_statfs - Gather and return stats about the filesystem
211 * @sb: The superblock
212 * @statfsbuf: The buffer
213 *
214 * Returns: 0 on success or error code
215 */
216
217 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
218 {
219 struct super_block *sb = dentry->d_inode->i_sb;
220 struct gfs2_sbd *sdp = sb->s_fs_info;
221 struct gfs2_statfs_change_host sc;
222 int error;
223
224 if (gfs2_tune_get(sdp, gt_statfs_slow))
225 error = gfs2_statfs_slow(sdp, &sc);
226 else
227 error = gfs2_statfs_i(sdp, &sc);
228
229 if (error)
230 return error;
231
232 buf->f_type = GFS2_MAGIC;
233 buf->f_bsize = sdp->sd_sb.sb_bsize;
234 buf->f_blocks = sc.sc_total;
235 buf->f_bfree = sc.sc_free;
236 buf->f_bavail = sc.sc_free;
237 buf->f_files = sc.sc_dinodes + sc.sc_free;
238 buf->f_ffree = sc.sc_free;
239 buf->f_namelen = GFS2_FNAMESIZE;
240
241 return 0;
242 }
243
244 /**
245 * gfs2_remount_fs - called when the FS is remounted
246 * @sb: the filesystem
247 * @flags: the remount flags
248 * @data: extra data passed in (not used right now)
249 *
250 * Returns: errno
251 */
252
253 static int gfs2_remount_fs(struct super_block *sb, int *flags, char *data)
254 {
255 struct gfs2_sbd *sdp = sb->s_fs_info;
256 int error;
257
258 error = gfs2_mount_args(sdp, data, 1);
259 if (error)
260 return error;
261
262 if (sdp->sd_args.ar_spectator)
263 *flags |= MS_RDONLY;
264 else {
265 if (*flags & MS_RDONLY) {
266 if (!(sb->s_flags & MS_RDONLY))
267 error = gfs2_make_fs_ro(sdp);
268 } else if (!(*flags & MS_RDONLY) &&
269 (sb->s_flags & MS_RDONLY)) {
270 error = gfs2_make_fs_rw(sdp);
271 }
272 }
273
274 if (*flags & (MS_NOATIME | MS_NODIRATIME))
275 set_bit(SDF_NOATIME, &sdp->sd_flags);
276 else
277 clear_bit(SDF_NOATIME, &sdp->sd_flags);
278
279 /* Don't let the VFS update atimes. GFS2 handles this itself. */
280 *flags |= MS_NOATIME | MS_NODIRATIME;
281
282 return error;
283 }
284
285 /**
286 * gfs2_drop_inode - Drop an inode (test for remote unlink)
287 * @inode: The inode to drop
288 *
289 * If we've received a callback on an iopen lock then its because a
290 * remote node tried to deallocate the inode but failed due to this node
291 * still having the inode open. Here we mark the link count zero
292 * since we know that it must have reached zero if the GLF_DEMOTE flag
293 * is set on the iopen glock. If we didn't do a disk read since the
294 * remote node removed the final link then we might otherwise miss
295 * this event. This check ensures that this node will deallocate the
296 * inode's blocks, or alternatively pass the baton on to another
297 * node for later deallocation.
298 */
299 static void gfs2_drop_inode(struct inode *inode)
300 {
301 if (inode->i_private && inode->i_nlink) {
302 struct gfs2_inode *ip = GFS2_I(inode);
303 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
304 if (gl && test_bit(GLF_DEMOTE, &gl->gl_flags))
305 clear_nlink(inode);
306 }
307 generic_drop_inode(inode);
308 }
309
310 /**
311 * gfs2_clear_inode - Deallocate an inode when VFS is done with it
312 * @inode: The VFS inode
313 *
314 */
315
316 static void gfs2_clear_inode(struct inode *inode)
317 {
318 /* This tells us its a "real" inode and not one which only
319 * serves to contain an address space (see rgrp.c, meta_io.c)
320 * which therefore doesn't have its own glocks.
321 */
322 if (inode->i_private) {
323 struct gfs2_inode *ip = GFS2_I(inode);
324 ip->i_gl->gl_object = NULL;
325 gfs2_glock_schedule_for_reclaim(ip->i_gl);
326 gfs2_glock_put(ip->i_gl);
327 ip->i_gl = NULL;
328 if (ip->i_iopen_gh.gh_gl) {
329 ip->i_iopen_gh.gh_gl->gl_object = NULL;
330 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
331 }
332 }
333 }
334
335 /**
336 * gfs2_show_options - Show mount options for /proc/mounts
337 * @s: seq_file structure
338 * @mnt: vfsmount
339 *
340 * Returns: 0 on success or error code
341 */
342
343 static int gfs2_show_options(struct seq_file *s, struct vfsmount *mnt)
344 {
345 struct gfs2_sbd *sdp = mnt->mnt_sb->s_fs_info;
346 struct gfs2_args *args = &sdp->sd_args;
347
348 if (args->ar_lockproto[0])
349 seq_printf(s, ",lockproto=%s", args->ar_lockproto);
350 if (args->ar_locktable[0])
351 seq_printf(s, ",locktable=%s", args->ar_locktable);
352 if (args->ar_hostdata[0])
353 seq_printf(s, ",hostdata=%s", args->ar_hostdata);
354 if (args->ar_spectator)
355 seq_printf(s, ",spectator");
356 if (args->ar_ignore_local_fs)
357 seq_printf(s, ",ignore_local_fs");
358 if (args->ar_localflocks)
359 seq_printf(s, ",localflocks");
360 if (args->ar_localcaching)
361 seq_printf(s, ",localcaching");
362 if (args->ar_debug)
363 seq_printf(s, ",debug");
364 if (args->ar_upgrade)
365 seq_printf(s, ",upgrade");
366 if (args->ar_num_glockd != GFS2_GLOCKD_DEFAULT)
367 seq_printf(s, ",num_glockd=%u", args->ar_num_glockd);
368 if (args->ar_posix_acl)
369 seq_printf(s, ",acl");
370 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
371 char *state;
372 switch (args->ar_quota) {
373 case GFS2_QUOTA_OFF:
374 state = "off";
375 break;
376 case GFS2_QUOTA_ACCOUNT:
377 state = "account";
378 break;
379 case GFS2_QUOTA_ON:
380 state = "on";
381 break;
382 default:
383 state = "unknown";
384 break;
385 }
386 seq_printf(s, ",quota=%s", state);
387 }
388 if (args->ar_suiddir)
389 seq_printf(s, ",suiddir");
390 if (args->ar_data != GFS2_DATA_DEFAULT) {
391 char *state;
392 switch (args->ar_data) {
393 case GFS2_DATA_WRITEBACK:
394 state = "writeback";
395 break;
396 case GFS2_DATA_ORDERED:
397 state = "ordered";
398 break;
399 default:
400 state = "unknown";
401 break;
402 }
403 seq_printf(s, ",data=%s", state);
404 }
405
406 return 0;
407 }
408
409 /*
410 * We have to (at the moment) hold the inodes main lock to cover
411 * the gap between unlocking the shared lock on the iopen lock and
412 * taking the exclusive lock. I'd rather do a shared -> exclusive
413 * conversion on the iopen lock, but we can change that later. This
414 * is safe, just less efficient.
415 */
416 static void gfs2_delete_inode(struct inode *inode)
417 {
418 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
419 struct gfs2_inode *ip = GFS2_I(inode);
420 struct gfs2_holder gh;
421 int error;
422
423 if (!inode->i_private)
424 goto out;
425
426 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
427 if (unlikely(error)) {
428 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
429 goto out;
430 }
431
432 gfs2_glock_dq_wait(&ip->i_iopen_gh);
433 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, &ip->i_iopen_gh);
434 error = gfs2_glock_nq(&ip->i_iopen_gh);
435 if (error)
436 goto out_uninit;
437
438 if (S_ISDIR(inode->i_mode) &&
439 (ip->i_di.di_flags & GFS2_DIF_EXHASH)) {
440 error = gfs2_dir_exhash_dealloc(ip);
441 if (error)
442 goto out_unlock;
443 }
444
445 if (ip->i_di.di_eattr) {
446 error = gfs2_ea_dealloc(ip);
447 if (error)
448 goto out_unlock;
449 }
450
451 if (!gfs2_is_stuffed(ip)) {
452 error = gfs2_file_dealloc(ip);
453 if (error)
454 goto out_unlock;
455 }
456
457 error = gfs2_dinode_dealloc(ip);
458 if (error)
459 goto out_unlock;
460
461 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
462 if (error)
463 goto out_unlock;
464 /* Needs to be done before glock release & also in a transaction */
465 truncate_inode_pages(&inode->i_data, 0);
466 gfs2_trans_end(sdp);
467
468 out_unlock:
469 gfs2_glock_dq(&ip->i_iopen_gh);
470 out_uninit:
471 gfs2_holder_uninit(&ip->i_iopen_gh);
472 gfs2_glock_dq_uninit(&gh);
473 if (error && error != GLR_TRYFAILED)
474 fs_warn(sdp, "gfs2_delete_inode: %d\n", error);
475 out:
476 truncate_inode_pages(&inode->i_data, 0);
477 clear_inode(inode);
478 }
479
480
481
482 static struct inode *gfs2_alloc_inode(struct super_block *sb)
483 {
484 struct gfs2_inode *ip;
485
486 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
487 if (ip) {
488 ip->i_flags = 0;
489 ip->i_gl = NULL;
490 }
491 return &ip->i_inode;
492 }
493
494 static void gfs2_destroy_inode(struct inode *inode)
495 {
496 kmem_cache_free(gfs2_inode_cachep, inode);
497 }
498
499 const struct super_operations gfs2_super_ops = {
500 .alloc_inode = gfs2_alloc_inode,
501 .destroy_inode = gfs2_destroy_inode,
502 .write_inode = gfs2_write_inode,
503 .delete_inode = gfs2_delete_inode,
504 .put_super = gfs2_put_super,
505 .write_super = gfs2_write_super,
506 .sync_fs = gfs2_sync_fs,
507 .write_super_lockfs = gfs2_write_super_lockfs,
508 .unlockfs = gfs2_unlockfs,
509 .statfs = gfs2_statfs,
510 .remount_fs = gfs2_remount_fs,
511 .clear_inode = gfs2_clear_inode,
512 .drop_inode = gfs2_drop_inode,
513 .show_options = gfs2_show_options,
514 };
515
516
|
This page was automatically generated by the
LXR engine.
|