Commit | Line | Data |
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b3b94faa DT |
1 | /* |
2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. | |
da6dd40d | 3 | * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved. |
b3b94faa DT |
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 | |
e9fc2aa0 | 7 | * of the GNU General Public License version 2. |
b3b94faa DT |
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> | |
71b86f56 | 15 | #include <linux/crc32.h> |
5c676f6d | 16 | #include <linux/gfs2_ondisk.h> |
f45b7ddd | 17 | #include <linux/bio.h> |
7d308590 | 18 | #include <linux/lm_interface.h> |
b3b94faa DT |
19 | |
20 | #include "gfs2.h" | |
5c676f6d | 21 | #include "incore.h" |
b3b94faa DT |
22 | #include "bmap.h" |
23 | #include "dir.h" | |
b3b94faa DT |
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" | |
5c676f6d | 34 | #include "util.h" |
b3b94faa | 35 | |
fefc03bf SW |
36 | /** |
37 | * gfs2_jindex_free - Clear all the journal index information | |
38 | * @sdp: The GFS2 superblock | |
39 | * | |
40 | */ | |
41 | ||
42 | void gfs2_jindex_free(struct gfs2_sbd *sdp) | |
43 | { | |
44 | struct list_head list, *head; | |
45 | struct gfs2_jdesc *jd; | |
46 | struct gfs2_journal_extent *jext; | |
47 | ||
48 | spin_lock(&sdp->sd_jindex_spin); | |
49 | list_add(&list, &sdp->sd_jindex_list); | |
50 | list_del_init(&sdp->sd_jindex_list); | |
51 | sdp->sd_journals = 0; | |
52 | spin_unlock(&sdp->sd_jindex_spin); | |
53 | ||
54 | while (!list_empty(&list)) { | |
55 | jd = list_entry(list.next, struct gfs2_jdesc, jd_list); | |
56 | head = &jd->extent_list; | |
57 | while (!list_empty(head)) { | |
58 | jext = list_entry(head->next, | |
59 | struct gfs2_journal_extent, | |
60 | extent_list); | |
61 | list_del(&jext->extent_list); | |
62 | kfree(jext); | |
63 | } | |
64 | list_del(&jd->jd_list); | |
65 | iput(jd->jd_inode); | |
66 | kfree(jd); | |
67 | } | |
68 | } | |
69 | ||
b3b94faa DT |
70 | static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid) |
71 | { | |
72 | struct gfs2_jdesc *jd; | |
73 | int found = 0; | |
74 | ||
75 | list_for_each_entry(jd, head, jd_list) { | |
76 | if (jd->jd_jid == jid) { | |
77 | found = 1; | |
78 | break; | |
79 | } | |
80 | } | |
81 | ||
82 | if (!found) | |
83 | jd = NULL; | |
84 | ||
85 | return jd; | |
86 | } | |
87 | ||
88 | struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid) | |
89 | { | |
90 | struct gfs2_jdesc *jd; | |
91 | ||
92 | spin_lock(&sdp->sd_jindex_spin); | |
93 | jd = jdesc_find_i(&sdp->sd_jindex_list, jid); | |
94 | spin_unlock(&sdp->sd_jindex_spin); | |
95 | ||
96 | return jd; | |
97 | } | |
98 | ||
b3b94faa DT |
99 | int gfs2_jdesc_check(struct gfs2_jdesc *jd) |
100 | { | |
feaa7bba SW |
101 | struct gfs2_inode *ip = GFS2_I(jd->jd_inode); |
102 | struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); | |
b3b94faa DT |
103 | int ar; |
104 | int error; | |
105 | ||
c9e98886 SW |
106 | if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) || |
107 | (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) { | |
b3b94faa DT |
108 | gfs2_consist_inode(ip); |
109 | return -EIO; | |
110 | } | |
c9e98886 | 111 | jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; |
b3b94faa | 112 | |
c9e98886 | 113 | error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar); |
b3b94faa DT |
114 | if (!error && ar) { |
115 | gfs2_consist_inode(ip); | |
116 | error = -EIO; | |
117 | } | |
118 | ||
119 | return error; | |
120 | } | |
121 | ||
b3b94faa DT |
122 | /** |
123 | * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one | |
124 | * @sdp: the filesystem | |
125 | * | |
126 | * Returns: errno | |
127 | */ | |
128 | ||
129 | int gfs2_make_fs_rw(struct gfs2_sbd *sdp) | |
130 | { | |
feaa7bba | 131 | struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); |
5c676f6d | 132 | struct gfs2_glock *j_gl = ip->i_gl; |
b3b94faa | 133 | struct gfs2_holder t_gh; |
55167622 | 134 | struct gfs2_log_header_host head; |
b3b94faa DT |
135 | int error; |
136 | ||
1c0f4872 | 137 | error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh); |
b3b94faa DT |
138 | if (error) |
139 | return error; | |
140 | ||
1a14d3a6 | 141 | j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); |
b3b94faa DT |
142 | |
143 | error = gfs2_find_jhead(sdp->sd_jdesc, &head); | |
144 | if (error) | |
145 | goto fail; | |
146 | ||
147 | if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { | |
148 | gfs2_consist(sdp); | |
149 | error = -EIO; | |
150 | goto fail; | |
151 | } | |
152 | ||
153 | /* Initialize some head of the log stuff */ | |
154 | sdp->sd_log_sequence = head.lh_sequence + 1; | |
155 | gfs2_log_pointers_init(sdp, head.lh_blkno); | |
156 | ||
b3b94faa DT |
157 | error = gfs2_quota_init(sdp); |
158 | if (error) | |
a91ea69f | 159 | goto fail; |
b3b94faa DT |
160 | |
161 | set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); | |
162 | ||
163 | gfs2_glock_dq_uninit(&t_gh); | |
164 | ||
165 | return 0; | |
166 | ||
a91ea69f | 167 | fail: |
b3b94faa DT |
168 | t_gh.gh_flags |= GL_NOCACHE; |
169 | gfs2_glock_dq_uninit(&t_gh); | |
170 | ||
171 | return error; | |
172 | } | |
173 | ||
bb8d8a6f SW |
174 | static void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf) |
175 | { | |
176 | const struct gfs2_statfs_change *str = buf; | |
177 | ||
178 | sc->sc_total = be64_to_cpu(str->sc_total); | |
179 | sc->sc_free = be64_to_cpu(str->sc_free); | |
180 | sc->sc_dinodes = be64_to_cpu(str->sc_dinodes); | |
181 | } | |
182 | ||
183 | static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf) | |
184 | { | |
185 | struct gfs2_statfs_change *str = buf; | |
186 | ||
187 | str->sc_total = cpu_to_be64(sc->sc_total); | |
188 | str->sc_free = cpu_to_be64(sc->sc_free); | |
189 | str->sc_dinodes = cpu_to_be64(sc->sc_dinodes); | |
190 | } | |
191 | ||
b3b94faa DT |
192 | int gfs2_statfs_init(struct gfs2_sbd *sdp) |
193 | { | |
feaa7bba | 194 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
bd209cc0 | 195 | struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; |
feaa7bba | 196 | struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); |
bd209cc0 | 197 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; |
b3b94faa DT |
198 | struct buffer_head *m_bh, *l_bh; |
199 | struct gfs2_holder gh; | |
200 | int error; | |
201 | ||
202 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, | |
203 | &gh); | |
204 | if (error) | |
205 | return error; | |
206 | ||
207 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
208 | if (error) | |
209 | goto out; | |
210 | ||
211 | if (sdp->sd_args.ar_spectator) { | |
212 | spin_lock(&sdp->sd_statfs_spin); | |
213 | gfs2_statfs_change_in(m_sc, m_bh->b_data + | |
214 | sizeof(struct gfs2_dinode)); | |
215 | spin_unlock(&sdp->sd_statfs_spin); | |
216 | } else { | |
217 | error = gfs2_meta_inode_buffer(l_ip, &l_bh); | |
218 | if (error) | |
219 | goto out_m_bh; | |
220 | ||
221 | spin_lock(&sdp->sd_statfs_spin); | |
222 | gfs2_statfs_change_in(m_sc, m_bh->b_data + | |
223 | sizeof(struct gfs2_dinode)); | |
224 | gfs2_statfs_change_in(l_sc, l_bh->b_data + | |
225 | sizeof(struct gfs2_dinode)); | |
226 | spin_unlock(&sdp->sd_statfs_spin); | |
227 | ||
228 | brelse(l_bh); | |
229 | } | |
230 | ||
a91ea69f | 231 | out_m_bh: |
b3b94faa | 232 | brelse(m_bh); |
a91ea69f | 233 | out: |
b3b94faa | 234 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
235 | return 0; |
236 | } | |
237 | ||
cd915493 SW |
238 | void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free, |
239 | s64 dinodes) | |
b3b94faa | 240 | { |
feaa7bba | 241 | struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); |
bd209cc0 | 242 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; |
b3b94faa DT |
243 | struct buffer_head *l_bh; |
244 | int error; | |
245 | ||
246 | error = gfs2_meta_inode_buffer(l_ip, &l_bh); | |
247 | if (error) | |
248 | return; | |
249 | ||
d4e9c4c3 | 250 | gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1); |
b3b94faa DT |
251 | |
252 | spin_lock(&sdp->sd_statfs_spin); | |
253 | l_sc->sc_total += total; | |
254 | l_sc->sc_free += free; | |
255 | l_sc->sc_dinodes += dinodes; | |
907b9bce | 256 | gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode)); |
b3b94faa DT |
257 | spin_unlock(&sdp->sd_statfs_spin); |
258 | ||
259 | brelse(l_bh); | |
260 | } | |
261 | ||
262 | int gfs2_statfs_sync(struct gfs2_sbd *sdp) | |
263 | { | |
feaa7bba SW |
264 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
265 | struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); | |
bd209cc0 AV |
266 | struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; |
267 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; | |
b3b94faa DT |
268 | struct gfs2_holder gh; |
269 | struct buffer_head *m_bh, *l_bh; | |
270 | int error; | |
271 | ||
272 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, | |
273 | &gh); | |
274 | if (error) | |
275 | return error; | |
276 | ||
277 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
278 | if (error) | |
279 | goto out; | |
280 | ||
281 | spin_lock(&sdp->sd_statfs_spin); | |
282 | gfs2_statfs_change_in(m_sc, m_bh->b_data + | |
907b9bce | 283 | sizeof(struct gfs2_dinode)); |
b3b94faa DT |
284 | if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) { |
285 | spin_unlock(&sdp->sd_statfs_spin); | |
286 | goto out_bh; | |
287 | } | |
288 | spin_unlock(&sdp->sd_statfs_spin); | |
289 | ||
290 | error = gfs2_meta_inode_buffer(l_ip, &l_bh); | |
291 | if (error) | |
292 | goto out_bh; | |
293 | ||
294 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
295 | if (error) | |
296 | goto out_bh2; | |
297 | ||
d4e9c4c3 | 298 | gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1); |
b3b94faa DT |
299 | |
300 | spin_lock(&sdp->sd_statfs_spin); | |
301 | m_sc->sc_total += l_sc->sc_total; | |
302 | m_sc->sc_free += l_sc->sc_free; | |
303 | m_sc->sc_dinodes += l_sc->sc_dinodes; | |
304 | memset(l_sc, 0, sizeof(struct gfs2_statfs_change)); | |
305 | memset(l_bh->b_data + sizeof(struct gfs2_dinode), | |
306 | 0, sizeof(struct gfs2_statfs_change)); | |
307 | spin_unlock(&sdp->sd_statfs_spin); | |
308 | ||
d4e9c4c3 | 309 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b3b94faa DT |
310 | gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); |
311 | ||
312 | gfs2_trans_end(sdp); | |
313 | ||
a91ea69f | 314 | out_bh2: |
b3b94faa | 315 | brelse(l_bh); |
a91ea69f | 316 | out_bh: |
b3b94faa | 317 | brelse(m_bh); |
a91ea69f | 318 | out: |
b3b94faa | 319 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
320 | return error; |
321 | } | |
322 | ||
b3b94faa DT |
323 | struct lfcc { |
324 | struct list_head list; | |
325 | struct gfs2_holder gh; | |
326 | }; | |
327 | ||
328 | /** | |
329 | * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all | |
330 | * journals are clean | |
331 | * @sdp: the file system | |
332 | * @state: the state to put the transaction lock into | |
333 | * @t_gh: the hold on the transaction lock | |
334 | * | |
335 | * Returns: errno | |
336 | */ | |
337 | ||
08bc2dbc AB |
338 | static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp, |
339 | struct gfs2_holder *t_gh) | |
b3b94faa | 340 | { |
5c676f6d | 341 | struct gfs2_inode *ip; |
b3b94faa DT |
342 | struct gfs2_holder ji_gh; |
343 | struct gfs2_jdesc *jd; | |
344 | struct lfcc *lfcc; | |
345 | LIST_HEAD(list); | |
55167622 | 346 | struct gfs2_log_header_host lh; |
b3b94faa DT |
347 | int error; |
348 | ||
b3b94faa DT |
349 | list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { |
350 | lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL); | |
351 | if (!lfcc) { | |
352 | error = -ENOMEM; | |
353 | goto out; | |
354 | } | |
feaa7bba SW |
355 | ip = GFS2_I(jd->jd_inode); |
356 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh); | |
b3b94faa DT |
357 | if (error) { |
358 | kfree(lfcc); | |
359 | goto out; | |
360 | } | |
361 | list_add(&lfcc->list, &list); | |
362 | } | |
363 | ||
364 | error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED, | |
6802e340 | 365 | GL_NOCACHE, t_gh); |
b3b94faa DT |
366 | |
367 | list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { | |
368 | error = gfs2_jdesc_check(jd); | |
369 | if (error) | |
370 | break; | |
371 | error = gfs2_find_jhead(jd, &lh); | |
372 | if (error) | |
373 | break; | |
374 | if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { | |
375 | error = -EBUSY; | |
376 | break; | |
377 | } | |
378 | } | |
379 | ||
380 | if (error) | |
381 | gfs2_glock_dq_uninit(t_gh); | |
382 | ||
a91ea69f | 383 | out: |
b3b94faa DT |
384 | while (!list_empty(&list)) { |
385 | lfcc = list_entry(list.next, struct lfcc, list); | |
386 | list_del(&lfcc->list); | |
387 | gfs2_glock_dq_uninit(&lfcc->gh); | |
388 | kfree(lfcc); | |
389 | } | |
390 | gfs2_glock_dq_uninit(&ji_gh); | |
b3b94faa DT |
391 | return error; |
392 | } | |
393 | ||
394 | /** | |
395 | * gfs2_freeze_fs - freezes the file system | |
396 | * @sdp: the file system | |
397 | * | |
398 | * This function flushes data and meta data for all machines by | |
399 | * aquiring the transaction log exclusively. All journals are | |
400 | * ensured to be in a clean state as well. | |
401 | * | |
402 | * Returns: errno | |
403 | */ | |
404 | ||
405 | int gfs2_freeze_fs(struct gfs2_sbd *sdp) | |
406 | { | |
407 | int error = 0; | |
408 | ||
f55ab26a | 409 | mutex_lock(&sdp->sd_freeze_lock); |
b3b94faa DT |
410 | |
411 | if (!sdp->sd_freeze_count++) { | |
412 | error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh); | |
413 | if (error) | |
414 | sdp->sd_freeze_count--; | |
415 | } | |
416 | ||
f55ab26a | 417 | mutex_unlock(&sdp->sd_freeze_lock); |
b3b94faa DT |
418 | |
419 | return error; | |
420 | } | |
421 | ||
422 | /** | |
423 | * gfs2_unfreeze_fs - unfreezes the file system | |
424 | * @sdp: the file system | |
425 | * | |
426 | * This function allows the file system to proceed by unlocking | |
427 | * the exclusively held transaction lock. Other GFS2 nodes are | |
428 | * now free to acquire the lock shared and go on with their lives. | |
429 | * | |
430 | */ | |
431 | ||
432 | void gfs2_unfreeze_fs(struct gfs2_sbd *sdp) | |
433 | { | |
f55ab26a | 434 | mutex_lock(&sdp->sd_freeze_lock); |
b3b94faa DT |
435 | |
436 | if (sdp->sd_freeze_count && !--sdp->sd_freeze_count) | |
437 | gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); | |
438 | ||
f55ab26a | 439 | mutex_unlock(&sdp->sd_freeze_lock); |
b3b94faa DT |
440 | } |
441 |