Commit | Line | Data |
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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> | |
5c676f6d | 15 | #include <linux/gfs2_ondisk.h> |
b3b94faa DT |
16 | #include <asm/semaphore.h> |
17 | ||
18 | #include "gfs2.h" | |
5c676f6d SW |
19 | #include "lm_interface.h" |
20 | #include "incore.h" | |
b3b94faa DT |
21 | #include "bmap.h" |
22 | #include "dir.h" | |
23 | #include "format.h" | |
24 | #include "glock.h" | |
25 | #include "glops.h" | |
26 | #include "inode.h" | |
27 | #include "log.h" | |
28 | #include "meta_io.h" | |
29 | #include "quota.h" | |
30 | #include "recovery.h" | |
31 | #include "rgrp.h" | |
32 | #include "super.h" | |
33 | #include "trans.h" | |
34 | #include "unlinked.h" | |
5c676f6d | 35 | #include "util.h" |
b3b94faa DT |
36 | |
37 | /** | |
38 | * gfs2_tune_init - Fill a gfs2_tune structure with default values | |
39 | * @gt: tune | |
40 | * | |
41 | */ | |
42 | ||
43 | void gfs2_tune_init(struct gfs2_tune *gt) | |
44 | { | |
45 | spin_lock_init(>->gt_spin); | |
46 | ||
47 | gt->gt_ilimit = 100; | |
48 | gt->gt_ilimit_tries = 3; | |
49 | gt->gt_ilimit_min = 1; | |
50 | gt->gt_demote_secs = 300; | |
51 | gt->gt_incore_log_blocks = 1024; | |
52 | gt->gt_log_flush_secs = 60; | |
53 | gt->gt_jindex_refresh_secs = 60; | |
54 | gt->gt_scand_secs = 15; | |
55 | gt->gt_recoverd_secs = 60; | |
56 | gt->gt_logd_secs = 1; | |
57 | gt->gt_quotad_secs = 5; | |
58 | gt->gt_inoded_secs = 15; | |
59 | gt->gt_quota_simul_sync = 64; | |
60 | gt->gt_quota_warn_period = 10; | |
61 | gt->gt_quota_scale_num = 1; | |
62 | gt->gt_quota_scale_den = 1; | |
63 | gt->gt_quota_cache_secs = 300; | |
64 | gt->gt_quota_quantum = 60; | |
65 | gt->gt_atime_quantum = 3600; | |
66 | gt->gt_new_files_jdata = 0; | |
67 | gt->gt_new_files_directio = 0; | |
68 | gt->gt_max_atomic_write = 4 << 20; | |
69 | gt->gt_max_readahead = 1 << 18; | |
70 | gt->gt_lockdump_size = 131072; | |
71 | gt->gt_stall_secs = 600; | |
72 | gt->gt_complain_secs = 10; | |
73 | gt->gt_reclaim_limit = 5000; | |
74 | gt->gt_entries_per_readdir = 32; | |
75 | gt->gt_prefetch_secs = 10; | |
76 | gt->gt_greedy_default = HZ / 10; | |
77 | gt->gt_greedy_quantum = HZ / 40; | |
78 | gt->gt_greedy_max = HZ / 4; | |
79 | gt->gt_statfs_quantum = 30; | |
80 | gt->gt_statfs_slow = 0; | |
81 | } | |
82 | ||
83 | /** | |
84 | * gfs2_check_sb - Check superblock | |
85 | * @sdp: the filesystem | |
86 | * @sb: The superblock | |
87 | * @silent: Don't print a message if the check fails | |
88 | * | |
89 | * Checks the version code of the FS is one that we understand how to | |
90 | * read and that the sizes of the various on-disk structures have not | |
91 | * changed. | |
92 | */ | |
93 | ||
94 | int gfs2_check_sb(struct gfs2_sbd *sdp, struct gfs2_sb *sb, int silent) | |
95 | { | |
96 | unsigned int x; | |
97 | ||
98 | if (sb->sb_header.mh_magic != GFS2_MAGIC || | |
99 | sb->sb_header.mh_type != GFS2_METATYPE_SB) { | |
100 | if (!silent) | |
d92a8d48 | 101 | printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n"); |
b3b94faa DT |
102 | return -EINVAL; |
103 | } | |
104 | ||
105 | /* If format numbers match exactly, we're done. */ | |
106 | ||
107 | if (sb->sb_fs_format == GFS2_FORMAT_FS && | |
108 | sb->sb_multihost_format == GFS2_FORMAT_MULTI) | |
109 | return 0; | |
110 | ||
111 | if (sb->sb_fs_format != GFS2_FORMAT_FS) { | |
112 | for (x = 0; gfs2_old_fs_formats[x]; x++) | |
113 | if (gfs2_old_fs_formats[x] == sb->sb_fs_format) | |
114 | break; | |
115 | ||
116 | if (!gfs2_old_fs_formats[x]) { | |
568f4c96 SW |
117 | printk(KERN_WARNING |
118 | "GFS2: code version (%u, %u) is incompatible " | |
b3b94faa DT |
119 | "with ondisk format (%u, %u)\n", |
120 | GFS2_FORMAT_FS, GFS2_FORMAT_MULTI, | |
121 | sb->sb_fs_format, sb->sb_multihost_format); | |
568f4c96 SW |
122 | printk(KERN_WARNING |
123 | "GFS2: I don't know how to upgrade this FS\n"); | |
b3b94faa DT |
124 | return -EINVAL; |
125 | } | |
126 | } | |
127 | ||
128 | if (sb->sb_multihost_format != GFS2_FORMAT_MULTI) { | |
129 | for (x = 0; gfs2_old_multihost_formats[x]; x++) | |
568f4c96 SW |
130 | if (gfs2_old_multihost_formats[x] == |
131 | sb->sb_multihost_format) | |
b3b94faa DT |
132 | break; |
133 | ||
134 | if (!gfs2_old_multihost_formats[x]) { | |
568f4c96 SW |
135 | printk(KERN_WARNING |
136 | "GFS2: code version (%u, %u) is incompatible " | |
b3b94faa DT |
137 | "with ondisk format (%u, %u)\n", |
138 | GFS2_FORMAT_FS, GFS2_FORMAT_MULTI, | |
139 | sb->sb_fs_format, sb->sb_multihost_format); | |
568f4c96 SW |
140 | printk(KERN_WARNING |
141 | "GFS2: I don't know how to upgrade this FS\n"); | |
b3b94faa DT |
142 | return -EINVAL; |
143 | } | |
144 | } | |
145 | ||
146 | if (!sdp->sd_args.ar_upgrade) { | |
568f4c96 SW |
147 | printk(KERN_WARNING |
148 | "GFS2: code version (%u, %u) is incompatible " | |
b3b94faa DT |
149 | "with ondisk format (%u, %u)\n", |
150 | GFS2_FORMAT_FS, GFS2_FORMAT_MULTI, | |
151 | sb->sb_fs_format, sb->sb_multihost_format); | |
568f4c96 SW |
152 | printk(KERN_INFO |
153 | "GFS2: Use the \"upgrade\" mount option to upgrade " | |
b3b94faa | 154 | "the FS\n"); |
d92a8d48 | 155 | printk(KERN_INFO "GFS2: See the manual for more details\n"); |
b3b94faa DT |
156 | return -EINVAL; |
157 | } | |
158 | ||
159 | return 0; | |
160 | } | |
161 | ||
162 | /** | |
163 | * gfs2_read_sb - Read super block | |
164 | * @sdp: The GFS2 superblock | |
165 | * @gl: the glock for the superblock (assumed to be held) | |
166 | * @silent: Don't print message if mount fails | |
167 | * | |
168 | */ | |
169 | ||
170 | int gfs2_read_sb(struct gfs2_sbd *sdp, struct gfs2_glock *gl, int silent) | |
171 | { | |
172 | struct buffer_head *bh; | |
173 | uint32_t hash_blocks, ind_blocks, leaf_blocks; | |
174 | uint32_t tmp_blocks; | |
175 | unsigned int x; | |
176 | int error; | |
177 | ||
178 | error = gfs2_meta_read(gl, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, | |
179 | DIO_FORCE | DIO_START | DIO_WAIT, &bh); | |
180 | if (error) { | |
181 | if (!silent) | |
182 | fs_err(sdp, "can't read superblock\n"); | |
183 | return error; | |
184 | } | |
185 | ||
186 | gfs2_assert(sdp, sizeof(struct gfs2_sb) <= bh->b_size); | |
187 | gfs2_sb_in(&sdp->sd_sb, bh->b_data); | |
188 | brelse(bh); | |
189 | ||
190 | error = gfs2_check_sb(sdp, &sdp->sd_sb, silent); | |
191 | if (error) | |
192 | return error; | |
193 | ||
194 | sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - | |
195 | GFS2_BASIC_BLOCK_SHIFT; | |
196 | sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift; | |
197 | sdp->sd_diptrs = (sdp->sd_sb.sb_bsize - | |
198 | sizeof(struct gfs2_dinode)) / sizeof(uint64_t); | |
199 | sdp->sd_inptrs = (sdp->sd_sb.sb_bsize - | |
200 | sizeof(struct gfs2_meta_header)) / sizeof(uint64_t); | |
201 | sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header); | |
202 | sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2; | |
203 | sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1; | |
204 | sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(uint64_t); | |
205 | sdp->sd_ut_per_block = (sdp->sd_sb.sb_bsize - | |
206 | sizeof(struct gfs2_meta_header)) / | |
207 | sizeof(struct gfs2_unlinked_tag); | |
208 | sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize - | |
209 | sizeof(struct gfs2_meta_header)) / | |
210 | sizeof(struct gfs2_quota_change); | |
211 | ||
212 | /* Compute maximum reservation required to add a entry to a directory */ | |
213 | ||
5c676f6d | 214 | hash_blocks = DIV_ROUND_UP(sizeof(uint64_t) * (1 << GFS2_DIR_MAX_DEPTH), |
b3b94faa DT |
215 | sdp->sd_jbsize); |
216 | ||
217 | ind_blocks = 0; | |
218 | for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) { | |
5c676f6d | 219 | tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs); |
b3b94faa DT |
220 | ind_blocks += tmp_blocks; |
221 | } | |
222 | ||
223 | leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH; | |
224 | ||
225 | sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks; | |
226 | ||
227 | sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize - | |
228 | sizeof(struct gfs2_dinode); | |
229 | sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs; | |
230 | for (x = 2;; x++) { | |
231 | uint64_t space, d; | |
232 | uint32_t m; | |
233 | ||
234 | space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs; | |
235 | d = space; | |
236 | m = do_div(d, sdp->sd_inptrs); | |
237 | ||
238 | if (d != sdp->sd_heightsize[x - 1] || m) | |
239 | break; | |
240 | sdp->sd_heightsize[x] = space; | |
241 | } | |
242 | sdp->sd_max_height = x; | |
243 | gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT); | |
244 | ||
245 | sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize - | |
246 | sizeof(struct gfs2_dinode); | |
247 | sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs; | |
248 | for (x = 2;; x++) { | |
249 | uint64_t space, d; | |
250 | uint32_t m; | |
251 | ||
252 | space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs; | |
253 | d = space; | |
254 | m = do_div(d, sdp->sd_inptrs); | |
255 | ||
256 | if (d != sdp->sd_jheightsize[x - 1] || m) | |
257 | break; | |
258 | sdp->sd_jheightsize[x] = space; | |
259 | } | |
260 | sdp->sd_max_jheight = x; | |
261 | gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT); | |
262 | ||
263 | return 0; | |
264 | } | |
265 | ||
266 | int gfs2_do_upgrade(struct gfs2_sbd *sdp, struct gfs2_glock *sb_gl) | |
267 | { | |
268 | return 0; | |
269 | } | |
270 | ||
271 | /** | |
272 | * gfs2_jindex_hold - Grab a lock on the jindex | |
273 | * @sdp: The GFS2 superblock | |
274 | * @ji_gh: the holder for the jindex glock | |
275 | * | |
276 | * This is very similar to the gfs2_rindex_hold() function, except that | |
277 | * in general we hold the jindex lock for longer periods of time and | |
278 | * we grab it far less frequently (in general) then the rgrp lock. | |
279 | * | |
280 | * Returns: errno | |
281 | */ | |
282 | ||
283 | int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) | |
284 | { | |
5c676f6d | 285 | struct gfs2_inode *dip = sdp->sd_jindex->u.generic_ip; |
b3b94faa DT |
286 | struct qstr name; |
287 | char buf[20]; | |
288 | struct gfs2_jdesc *jd; | |
289 | int error; | |
290 | ||
291 | name.name = buf; | |
292 | ||
f55ab26a | 293 | mutex_lock(&sdp->sd_jindex_mutex); |
b3b94faa DT |
294 | |
295 | for (;;) { | |
296 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, | |
297 | GL_LOCAL_EXCL, ji_gh); | |
298 | if (error) | |
299 | break; | |
300 | ||
301 | name.len = sprintf(buf, "journal%u", sdp->sd_journals); | |
302 | ||
5c676f6d | 303 | error = gfs2_dir_search(sdp->sd_jindex->u.generic_ip, |
568f4c96 | 304 | &name, NULL, NULL); |
b3b94faa DT |
305 | if (error == -ENOENT) { |
306 | error = 0; | |
307 | break; | |
308 | } | |
309 | ||
310 | gfs2_glock_dq_uninit(ji_gh); | |
311 | ||
312 | if (error) | |
313 | break; | |
314 | ||
315 | error = -ENOMEM; | |
316 | jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); | |
317 | if (!jd) | |
318 | break; | |
319 | ||
7359a19c | 320 | error = gfs2_lookupi(sdp->sd_jindex, &name, 1, &jd->jd_inode); |
b3b94faa DT |
321 | if (error) { |
322 | kfree(jd); | |
323 | break; | |
324 | } | |
325 | ||
326 | spin_lock(&sdp->sd_jindex_spin); | |
327 | jd->jd_jid = sdp->sd_journals++; | |
328 | list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); | |
329 | spin_unlock(&sdp->sd_jindex_spin); | |
330 | } | |
331 | ||
f55ab26a | 332 | mutex_unlock(&sdp->sd_jindex_mutex); |
b3b94faa DT |
333 | |
334 | return error; | |
335 | } | |
336 | ||
337 | /** | |
338 | * gfs2_jindex_free - Clear all the journal index information | |
339 | * @sdp: The GFS2 superblock | |
340 | * | |
341 | */ | |
342 | ||
343 | void gfs2_jindex_free(struct gfs2_sbd *sdp) | |
344 | { | |
345 | struct list_head list; | |
346 | struct gfs2_jdesc *jd; | |
347 | ||
348 | spin_lock(&sdp->sd_jindex_spin); | |
349 | list_add(&list, &sdp->sd_jindex_list); | |
350 | list_del_init(&sdp->sd_jindex_list); | |
351 | sdp->sd_journals = 0; | |
352 | spin_unlock(&sdp->sd_jindex_spin); | |
353 | ||
354 | while (!list_empty(&list)) { | |
355 | jd = list_entry(list.next, struct gfs2_jdesc, jd_list); | |
356 | list_del(&jd->jd_list); | |
7359a19c | 357 | iput(jd->jd_inode); |
b3b94faa DT |
358 | kfree(jd); |
359 | } | |
360 | } | |
361 | ||
362 | static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid) | |
363 | { | |
364 | struct gfs2_jdesc *jd; | |
365 | int found = 0; | |
366 | ||
367 | list_for_each_entry(jd, head, jd_list) { | |
368 | if (jd->jd_jid == jid) { | |
369 | found = 1; | |
370 | break; | |
371 | } | |
372 | } | |
373 | ||
374 | if (!found) | |
375 | jd = NULL; | |
376 | ||
377 | return jd; | |
378 | } | |
379 | ||
380 | struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid) | |
381 | { | |
382 | struct gfs2_jdesc *jd; | |
383 | ||
384 | spin_lock(&sdp->sd_jindex_spin); | |
385 | jd = jdesc_find_i(&sdp->sd_jindex_list, jid); | |
386 | spin_unlock(&sdp->sd_jindex_spin); | |
387 | ||
388 | return jd; | |
389 | } | |
390 | ||
391 | void gfs2_jdesc_make_dirty(struct gfs2_sbd *sdp, unsigned int jid) | |
392 | { | |
393 | struct gfs2_jdesc *jd; | |
394 | ||
395 | spin_lock(&sdp->sd_jindex_spin); | |
396 | jd = jdesc_find_i(&sdp->sd_jindex_list, jid); | |
397 | if (jd) | |
398 | jd->jd_dirty = 1; | |
399 | spin_unlock(&sdp->sd_jindex_spin); | |
400 | } | |
401 | ||
402 | struct gfs2_jdesc *gfs2_jdesc_find_dirty(struct gfs2_sbd *sdp) | |
403 | { | |
404 | struct gfs2_jdesc *jd; | |
405 | int found = 0; | |
406 | ||
407 | spin_lock(&sdp->sd_jindex_spin); | |
408 | ||
409 | list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { | |
410 | if (jd->jd_dirty) { | |
411 | jd->jd_dirty = 0; | |
412 | found = 1; | |
413 | break; | |
414 | } | |
415 | } | |
416 | spin_unlock(&sdp->sd_jindex_spin); | |
417 | ||
418 | if (!found) | |
419 | jd = NULL; | |
420 | ||
421 | return jd; | |
422 | } | |
423 | ||
424 | int gfs2_jdesc_check(struct gfs2_jdesc *jd) | |
425 | { | |
5c676f6d | 426 | struct gfs2_inode *ip = jd->jd_inode->u.generic_ip; |
b3b94faa DT |
427 | struct gfs2_sbd *sdp = ip->i_sbd; |
428 | int ar; | |
429 | int error; | |
430 | ||
431 | if (ip->i_di.di_size < (8 << 20) || | |
432 | ip->i_di.di_size > (1 << 30) || | |
433 | (ip->i_di.di_size & (sdp->sd_sb.sb_bsize - 1))) { | |
434 | gfs2_consist_inode(ip); | |
435 | return -EIO; | |
436 | } | |
437 | jd->jd_blocks = ip->i_di.di_size >> sdp->sd_sb.sb_bsize_shift; | |
438 | ||
439 | error = gfs2_write_alloc_required(ip, | |
440 | 0, ip->i_di.di_size, | |
441 | &ar); | |
442 | if (!error && ar) { | |
443 | gfs2_consist_inode(ip); | |
444 | error = -EIO; | |
445 | } | |
446 | ||
447 | return error; | |
448 | } | |
449 | ||
450 | int gfs2_lookup_master_dir(struct gfs2_sbd *sdp) | |
451 | { | |
f42faf4f | 452 | struct inode *inode = NULL; |
b3b94faa DT |
453 | struct gfs2_glock *gl; |
454 | int error; | |
455 | ||
456 | error = gfs2_glock_get(sdp, | |
457 | sdp->sd_sb.sb_master_dir.no_addr, | |
458 | &gfs2_inode_glops, CREATE, &gl); | |
459 | if (!error) { | |
568f4c96 SW |
460 | error = gfs2_lookup_simple(sdp->sd_root_dir, ".gfs2_admin", |
461 | &inode); | |
f42faf4f | 462 | sdp->sd_master_dir = inode; |
b3b94faa DT |
463 | gfs2_glock_put(gl); |
464 | } | |
465 | ||
466 | return error; | |
467 | } | |
468 | ||
469 | /** | |
470 | * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one | |
471 | * @sdp: the filesystem | |
472 | * | |
473 | * Returns: errno | |
474 | */ | |
475 | ||
476 | int gfs2_make_fs_rw(struct gfs2_sbd *sdp) | |
477 | { | |
5c676f6d SW |
478 | struct gfs2_inode *ip = sdp->sd_jdesc->jd_inode->u.generic_ip; |
479 | struct gfs2_glock *j_gl = ip->i_gl; | |
b3b94faa DT |
480 | struct gfs2_holder t_gh; |
481 | struct gfs2_log_header head; | |
482 | int error; | |
483 | ||
484 | error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, | |
485 | GL_LOCAL_EXCL | GL_NEVER_RECURSE, &t_gh); | |
486 | if (error) | |
487 | return error; | |
488 | ||
5c676f6d | 489 | gfs2_meta_cache_flush(ip); |
b3b94faa DT |
490 | j_gl->gl_ops->go_inval(j_gl, DIO_METADATA | DIO_DATA); |
491 | ||
492 | error = gfs2_find_jhead(sdp->sd_jdesc, &head); | |
493 | if (error) | |
494 | goto fail; | |
495 | ||
496 | if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { | |
497 | gfs2_consist(sdp); | |
498 | error = -EIO; | |
499 | goto fail; | |
500 | } | |
501 | ||
502 | /* Initialize some head of the log stuff */ | |
503 | sdp->sd_log_sequence = head.lh_sequence + 1; | |
504 | gfs2_log_pointers_init(sdp, head.lh_blkno); | |
505 | ||
506 | error = gfs2_unlinked_init(sdp); | |
507 | if (error) | |
508 | goto fail; | |
509 | error = gfs2_quota_init(sdp); | |
510 | if (error) | |
511 | goto fail_unlinked; | |
512 | ||
513 | set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); | |
514 | ||
515 | gfs2_glock_dq_uninit(&t_gh); | |
516 | ||
517 | return 0; | |
518 | ||
519 | fail_unlinked: | |
520 | gfs2_unlinked_cleanup(sdp); | |
521 | ||
522 | fail: | |
523 | t_gh.gh_flags |= GL_NOCACHE; | |
524 | gfs2_glock_dq_uninit(&t_gh); | |
525 | ||
526 | return error; | |
527 | } | |
528 | ||
529 | /** | |
530 | * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one | |
531 | * @sdp: the filesystem | |
532 | * | |
533 | * Returns: errno | |
534 | */ | |
535 | ||
536 | int gfs2_make_fs_ro(struct gfs2_sbd *sdp) | |
537 | { | |
538 | struct gfs2_holder t_gh; | |
539 | int error; | |
540 | ||
541 | gfs2_unlinked_dealloc(sdp); | |
542 | gfs2_quota_sync(sdp); | |
543 | gfs2_statfs_sync(sdp); | |
544 | ||
545 | error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, | |
546 | GL_LOCAL_EXCL | GL_NEVER_RECURSE | GL_NOCACHE, | |
547 | &t_gh); | |
548 | if (error && !test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) | |
549 | return error; | |
550 | ||
551 | gfs2_meta_syncfs(sdp); | |
552 | gfs2_log_shutdown(sdp); | |
553 | ||
554 | clear_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); | |
555 | ||
556 | if (t_gh.gh_gl) | |
557 | gfs2_glock_dq_uninit(&t_gh); | |
558 | ||
559 | gfs2_unlinked_cleanup(sdp); | |
560 | gfs2_quota_cleanup(sdp); | |
561 | ||
562 | return error; | |
563 | } | |
564 | ||
565 | int gfs2_statfs_init(struct gfs2_sbd *sdp) | |
566 | { | |
5c676f6d | 567 | struct gfs2_inode *m_ip = sdp->sd_statfs_inode->u.generic_ip; |
b3b94faa | 568 | struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master; |
5c676f6d | 569 | struct gfs2_inode *l_ip = sdp->sd_sc_inode->u.generic_ip; |
b3b94faa DT |
570 | struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local; |
571 | struct buffer_head *m_bh, *l_bh; | |
572 | struct gfs2_holder gh; | |
573 | int error; | |
574 | ||
575 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, | |
576 | &gh); | |
577 | if (error) | |
578 | return error; | |
579 | ||
580 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
581 | if (error) | |
582 | goto out; | |
583 | ||
584 | if (sdp->sd_args.ar_spectator) { | |
585 | spin_lock(&sdp->sd_statfs_spin); | |
586 | gfs2_statfs_change_in(m_sc, m_bh->b_data + | |
587 | sizeof(struct gfs2_dinode)); | |
588 | spin_unlock(&sdp->sd_statfs_spin); | |
589 | } else { | |
590 | error = gfs2_meta_inode_buffer(l_ip, &l_bh); | |
591 | if (error) | |
592 | goto out_m_bh; | |
593 | ||
594 | spin_lock(&sdp->sd_statfs_spin); | |
595 | gfs2_statfs_change_in(m_sc, m_bh->b_data + | |
596 | sizeof(struct gfs2_dinode)); | |
597 | gfs2_statfs_change_in(l_sc, l_bh->b_data + | |
598 | sizeof(struct gfs2_dinode)); | |
599 | spin_unlock(&sdp->sd_statfs_spin); | |
600 | ||
601 | brelse(l_bh); | |
602 | } | |
603 | ||
604 | out_m_bh: | |
605 | brelse(m_bh); | |
606 | ||
607 | out: | |
608 | gfs2_glock_dq_uninit(&gh); | |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
613 | void gfs2_statfs_change(struct gfs2_sbd *sdp, int64_t total, int64_t free, | |
614 | int64_t dinodes) | |
615 | { | |
5c676f6d | 616 | struct gfs2_inode *l_ip = sdp->sd_sc_inode->u.generic_ip; |
b3b94faa DT |
617 | struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local; |
618 | struct buffer_head *l_bh; | |
619 | int error; | |
620 | ||
621 | error = gfs2_meta_inode_buffer(l_ip, &l_bh); | |
622 | if (error) | |
623 | return; | |
624 | ||
f55ab26a | 625 | mutex_lock(&sdp->sd_statfs_mutex); |
d4e9c4c3 | 626 | gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1); |
f55ab26a | 627 | mutex_unlock(&sdp->sd_statfs_mutex); |
b3b94faa DT |
628 | |
629 | spin_lock(&sdp->sd_statfs_spin); | |
630 | l_sc->sc_total += total; | |
631 | l_sc->sc_free += free; | |
632 | l_sc->sc_dinodes += dinodes; | |
633 | gfs2_statfs_change_out(l_sc, l_bh->b_data + | |
634 | sizeof(struct gfs2_dinode)); | |
635 | spin_unlock(&sdp->sd_statfs_spin); | |
636 | ||
637 | brelse(l_bh); | |
638 | } | |
639 | ||
640 | int gfs2_statfs_sync(struct gfs2_sbd *sdp) | |
641 | { | |
5c676f6d SW |
642 | struct gfs2_inode *m_ip = sdp->sd_statfs_inode->u.generic_ip; |
643 | struct gfs2_inode *l_ip = sdp->sd_sc_inode->u.generic_ip; | |
b3b94faa DT |
644 | struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master; |
645 | struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local; | |
646 | struct gfs2_holder gh; | |
647 | struct buffer_head *m_bh, *l_bh; | |
648 | int error; | |
649 | ||
650 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, | |
651 | &gh); | |
652 | if (error) | |
653 | return error; | |
654 | ||
655 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
656 | if (error) | |
657 | goto out; | |
658 | ||
659 | spin_lock(&sdp->sd_statfs_spin); | |
660 | gfs2_statfs_change_in(m_sc, m_bh->b_data + | |
661 | sizeof(struct gfs2_dinode)); | |
662 | if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) { | |
663 | spin_unlock(&sdp->sd_statfs_spin); | |
664 | goto out_bh; | |
665 | } | |
666 | spin_unlock(&sdp->sd_statfs_spin); | |
667 | ||
668 | error = gfs2_meta_inode_buffer(l_ip, &l_bh); | |
669 | if (error) | |
670 | goto out_bh; | |
671 | ||
672 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
673 | if (error) | |
674 | goto out_bh2; | |
675 | ||
f55ab26a | 676 | mutex_lock(&sdp->sd_statfs_mutex); |
d4e9c4c3 | 677 | gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1); |
f55ab26a | 678 | mutex_unlock(&sdp->sd_statfs_mutex); |
b3b94faa DT |
679 | |
680 | spin_lock(&sdp->sd_statfs_spin); | |
681 | m_sc->sc_total += l_sc->sc_total; | |
682 | m_sc->sc_free += l_sc->sc_free; | |
683 | m_sc->sc_dinodes += l_sc->sc_dinodes; | |
684 | memset(l_sc, 0, sizeof(struct gfs2_statfs_change)); | |
685 | memset(l_bh->b_data + sizeof(struct gfs2_dinode), | |
686 | 0, sizeof(struct gfs2_statfs_change)); | |
687 | spin_unlock(&sdp->sd_statfs_spin); | |
688 | ||
d4e9c4c3 | 689 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b3b94faa DT |
690 | gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); |
691 | ||
692 | gfs2_trans_end(sdp); | |
693 | ||
694 | out_bh2: | |
695 | brelse(l_bh); | |
696 | ||
697 | out_bh: | |
698 | brelse(m_bh); | |
699 | ||
700 | out: | |
701 | gfs2_glock_dq_uninit(&gh); | |
702 | ||
703 | return error; | |
704 | } | |
705 | ||
706 | /** | |
707 | * gfs2_statfs_i - Do a statfs | |
708 | * @sdp: the filesystem | |
709 | * @sg: the sg structure | |
710 | * | |
711 | * Returns: errno | |
712 | */ | |
713 | ||
714 | int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change *sc) | |
715 | { | |
716 | struct gfs2_statfs_change *m_sc = &sdp->sd_statfs_master; | |
717 | struct gfs2_statfs_change *l_sc = &sdp->sd_statfs_local; | |
718 | ||
719 | spin_lock(&sdp->sd_statfs_spin); | |
720 | ||
721 | *sc = *m_sc; | |
722 | sc->sc_total += l_sc->sc_total; | |
723 | sc->sc_free += l_sc->sc_free; | |
724 | sc->sc_dinodes += l_sc->sc_dinodes; | |
725 | ||
726 | spin_unlock(&sdp->sd_statfs_spin); | |
727 | ||
728 | if (sc->sc_free < 0) | |
729 | sc->sc_free = 0; | |
730 | if (sc->sc_free > sc->sc_total) | |
731 | sc->sc_free = sc->sc_total; | |
732 | if (sc->sc_dinodes < 0) | |
733 | sc->sc_dinodes = 0; | |
734 | ||
735 | return 0; | |
736 | } | |
737 | ||
738 | /** | |
739 | * statfs_fill - fill in the sg for a given RG | |
740 | * @rgd: the RG | |
741 | * @sc: the sc structure | |
742 | * | |
743 | * Returns: 0 on success, -ESTALE if the LVB is invalid | |
744 | */ | |
745 | ||
746 | static int statfs_slow_fill(struct gfs2_rgrpd *rgd, | |
747 | struct gfs2_statfs_change *sc) | |
748 | { | |
749 | gfs2_rgrp_verify(rgd); | |
750 | sc->sc_total += rgd->rd_ri.ri_data; | |
751 | sc->sc_free += rgd->rd_rg.rg_free; | |
752 | sc->sc_dinodes += rgd->rd_rg.rg_dinodes; | |
753 | return 0; | |
754 | } | |
755 | ||
756 | /** | |
757 | * gfs2_statfs_slow - Stat a filesystem using asynchronous locking | |
758 | * @sdp: the filesystem | |
759 | * @sc: the sc info that will be returned | |
760 | * | |
761 | * Any error (other than a signal) will cause this routine to fall back | |
762 | * to the synchronous version. | |
763 | * | |
764 | * FIXME: This really shouldn't busy wait like this. | |
765 | * | |
766 | * Returns: errno | |
767 | */ | |
768 | ||
769 | int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change *sc) | |
770 | { | |
771 | struct gfs2_holder ri_gh; | |
772 | struct gfs2_rgrpd *rgd_next; | |
773 | struct gfs2_holder *gha, *gh; | |
774 | unsigned int slots = 64; | |
775 | unsigned int x; | |
776 | int done; | |
777 | int error = 0, err; | |
778 | ||
779 | memset(sc, 0, sizeof(struct gfs2_statfs_change)); | |
780 | gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL); | |
781 | if (!gha) | |
782 | return -ENOMEM; | |
783 | ||
784 | error = gfs2_rindex_hold(sdp, &ri_gh); | |
785 | if (error) | |
786 | goto out; | |
787 | ||
788 | rgd_next = gfs2_rgrpd_get_first(sdp); | |
789 | ||
790 | for (;;) { | |
791 | done = 1; | |
792 | ||
793 | for (x = 0; x < slots; x++) { | |
794 | gh = gha + x; | |
795 | ||
796 | if (gh->gh_gl && gfs2_glock_poll(gh)) { | |
797 | err = gfs2_glock_wait(gh); | |
798 | if (err) { | |
799 | gfs2_holder_uninit(gh); | |
800 | error = err; | |
801 | } else { | |
802 | if (!error) | |
5c676f6d SW |
803 | error = statfs_slow_fill( |
804 | gh->gh_gl->gl_object, sc); | |
b3b94faa DT |
805 | gfs2_glock_dq_uninit(gh); |
806 | } | |
807 | } | |
808 | ||
809 | if (gh->gh_gl) | |
810 | done = 0; | |
811 | else if (rgd_next && !error) { | |
812 | error = gfs2_glock_nq_init(rgd_next->rd_gl, | |
813 | LM_ST_SHARED, | |
814 | GL_ASYNC, | |
815 | gh); | |
816 | rgd_next = gfs2_rgrpd_get_next(rgd_next); | |
817 | done = 0; | |
818 | } | |
819 | ||
820 | if (signal_pending(current)) | |
821 | error = -ERESTARTSYS; | |
822 | } | |
823 | ||
824 | if (done) | |
825 | break; | |
826 | ||
827 | yield(); | |
828 | } | |
829 | ||
830 | gfs2_glock_dq_uninit(&ri_gh); | |
831 | ||
832 | out: | |
833 | kfree(gha); | |
834 | ||
835 | return error; | |
836 | } | |
837 | ||
838 | struct lfcc { | |
839 | struct list_head list; | |
840 | struct gfs2_holder gh; | |
841 | }; | |
842 | ||
843 | /** | |
844 | * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all | |
845 | * journals are clean | |
846 | * @sdp: the file system | |
847 | * @state: the state to put the transaction lock into | |
848 | * @t_gh: the hold on the transaction lock | |
849 | * | |
850 | * Returns: errno | |
851 | */ | |
852 | ||
853 | int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp, struct gfs2_holder *t_gh) | |
854 | { | |
5c676f6d | 855 | struct gfs2_inode *ip; |
b3b94faa DT |
856 | struct gfs2_holder ji_gh; |
857 | struct gfs2_jdesc *jd; | |
858 | struct lfcc *lfcc; | |
859 | LIST_HEAD(list); | |
860 | struct gfs2_log_header lh; | |
861 | int error; | |
862 | ||
863 | error = gfs2_jindex_hold(sdp, &ji_gh); | |
864 | if (error) | |
865 | return error; | |
866 | ||
867 | list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { | |
868 | lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL); | |
869 | if (!lfcc) { | |
870 | error = -ENOMEM; | |
871 | goto out; | |
872 | } | |
5c676f6d SW |
873 | ip = jd->jd_inode->u.generic_ip; |
874 | error = gfs2_glock_nq_init(ip->i_gl, | |
568f4c96 | 875 | LM_ST_SHARED, 0, |
b3b94faa DT |
876 | &lfcc->gh); |
877 | if (error) { | |
878 | kfree(lfcc); | |
879 | goto out; | |
880 | } | |
881 | list_add(&lfcc->list, &list); | |
882 | } | |
883 | ||
884 | error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED, | |
885 | LM_FLAG_PRIORITY | GL_NEVER_RECURSE | GL_NOCACHE, | |
886 | t_gh); | |
887 | ||
888 | list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { | |
889 | error = gfs2_jdesc_check(jd); | |
890 | if (error) | |
891 | break; | |
892 | error = gfs2_find_jhead(jd, &lh); | |
893 | if (error) | |
894 | break; | |
895 | if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { | |
896 | error = -EBUSY; | |
897 | break; | |
898 | } | |
899 | } | |
900 | ||
901 | if (error) | |
902 | gfs2_glock_dq_uninit(t_gh); | |
903 | ||
904 | out: | |
905 | while (!list_empty(&list)) { | |
906 | lfcc = list_entry(list.next, struct lfcc, list); | |
907 | list_del(&lfcc->list); | |
908 | gfs2_glock_dq_uninit(&lfcc->gh); | |
909 | kfree(lfcc); | |
910 | } | |
911 | gfs2_glock_dq_uninit(&ji_gh); | |
912 | ||
913 | return error; | |
914 | } | |
915 | ||
916 | /** | |
917 | * gfs2_freeze_fs - freezes the file system | |
918 | * @sdp: the file system | |
919 | * | |
920 | * This function flushes data and meta data for all machines by | |
921 | * aquiring the transaction log exclusively. All journals are | |
922 | * ensured to be in a clean state as well. | |
923 | * | |
924 | * Returns: errno | |
925 | */ | |
926 | ||
927 | int gfs2_freeze_fs(struct gfs2_sbd *sdp) | |
928 | { | |
929 | int error = 0; | |
930 | ||
f55ab26a | 931 | mutex_lock(&sdp->sd_freeze_lock); |
b3b94faa DT |
932 | |
933 | if (!sdp->sd_freeze_count++) { | |
934 | error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh); | |
935 | if (error) | |
936 | sdp->sd_freeze_count--; | |
937 | } | |
938 | ||
f55ab26a | 939 | mutex_unlock(&sdp->sd_freeze_lock); |
b3b94faa DT |
940 | |
941 | return error; | |
942 | } | |
943 | ||
944 | /** | |
945 | * gfs2_unfreeze_fs - unfreezes the file system | |
946 | * @sdp: the file system | |
947 | * | |
948 | * This function allows the file system to proceed by unlocking | |
949 | * the exclusively held transaction lock. Other GFS2 nodes are | |
950 | * now free to acquire the lock shared and go on with their lives. | |
951 | * | |
952 | */ | |
953 | ||
954 | void gfs2_unfreeze_fs(struct gfs2_sbd *sdp) | |
955 | { | |
f55ab26a | 956 | mutex_lock(&sdp->sd_freeze_lock); |
b3b94faa DT |
957 | |
958 | if (sdp->sd_freeze_count && !--sdp->sd_freeze_count) | |
959 | gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); | |
960 | ||
f55ab26a | 961 | mutex_unlock(&sdp->sd_freeze_lock); |
b3b94faa DT |
962 | } |
963 |