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 | |
b3b94faa DT |
36 | /** |
37 | * gfs2_jindex_hold - Grab a lock on the jindex | |
38 | * @sdp: The GFS2 superblock | |
39 | * @ji_gh: the holder for the jindex glock | |
40 | * | |
41 | * This is very similar to the gfs2_rindex_hold() function, except that | |
42 | * in general we hold the jindex lock for longer periods of time and | |
43 | * we grab it far less frequently (in general) then the rgrp lock. | |
44 | * | |
45 | * Returns: errno | |
46 | */ | |
47 | ||
48 | int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh) | |
49 | { | |
feaa7bba | 50 | struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex); |
b3b94faa DT |
51 | struct qstr name; |
52 | char buf[20]; | |
53 | struct gfs2_jdesc *jd; | |
54 | int error; | |
55 | ||
56 | name.name = buf; | |
57 | ||
f55ab26a | 58 | mutex_lock(&sdp->sd_jindex_mutex); |
b3b94faa DT |
59 | |
60 | for (;;) { | |
1c0f4872 | 61 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh); |
b3b94faa DT |
62 | if (error) |
63 | break; | |
64 | ||
65 | name.len = sprintf(buf, "journal%u", sdp->sd_journals); | |
c752666c | 66 | name.hash = gfs2_disk_hash(name.name, name.len); |
b3b94faa | 67 | |
dbb7cae2 | 68 | error = gfs2_dir_check(sdp->sd_jindex, &name, NULL); |
b3b94faa DT |
69 | if (error == -ENOENT) { |
70 | error = 0; | |
71 | break; | |
72 | } | |
73 | ||
74 | gfs2_glock_dq_uninit(ji_gh); | |
75 | ||
76 | if (error) | |
77 | break; | |
78 | ||
79 | error = -ENOMEM; | |
80 | jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL); | |
81 | if (!jd) | |
82 | break; | |
83 | ||
0811a127 | 84 | INIT_LIST_HEAD(&jd->extent_list); |
a569c711 | 85 | jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1); |
c752666c SW |
86 | if (!jd->jd_inode || IS_ERR(jd->jd_inode)) { |
87 | if (!jd->jd_inode) | |
88 | error = -ENOENT; | |
89 | else | |
90 | error = PTR_ERR(jd->jd_inode); | |
b3b94faa DT |
91 | kfree(jd); |
92 | break; | |
93 | } | |
94 | ||
95 | spin_lock(&sdp->sd_jindex_spin); | |
96 | jd->jd_jid = sdp->sd_journals++; | |
97 | list_add_tail(&jd->jd_list, &sdp->sd_jindex_list); | |
98 | spin_unlock(&sdp->sd_jindex_spin); | |
99 | } | |
100 | ||
f55ab26a | 101 | mutex_unlock(&sdp->sd_jindex_mutex); |
b3b94faa DT |
102 | |
103 | return error; | |
104 | } | |
105 | ||
106 | /** | |
107 | * gfs2_jindex_free - Clear all the journal index information | |
108 | * @sdp: The GFS2 superblock | |
109 | * | |
110 | */ | |
111 | ||
112 | void gfs2_jindex_free(struct gfs2_sbd *sdp) | |
113 | { | |
da6dd40d | 114 | struct list_head list, *head; |
b3b94faa | 115 | struct gfs2_jdesc *jd; |
da6dd40d | 116 | struct gfs2_journal_extent *jext; |
b3b94faa DT |
117 | |
118 | spin_lock(&sdp->sd_jindex_spin); | |
119 | list_add(&list, &sdp->sd_jindex_list); | |
120 | list_del_init(&sdp->sd_jindex_list); | |
121 | sdp->sd_journals = 0; | |
122 | spin_unlock(&sdp->sd_jindex_spin); | |
123 | ||
124 | while (!list_empty(&list)) { | |
125 | jd = list_entry(list.next, struct gfs2_jdesc, jd_list); | |
da6dd40d BP |
126 | head = &jd->extent_list; |
127 | while (!list_empty(head)) { | |
128 | jext = list_entry(head->next, | |
129 | struct gfs2_journal_extent, | |
130 | extent_list); | |
131 | list_del(&jext->extent_list); | |
132 | kfree(jext); | |
133 | } | |
b3b94faa | 134 | list_del(&jd->jd_list); |
7359a19c | 135 | iput(jd->jd_inode); |
b3b94faa DT |
136 | kfree(jd); |
137 | } | |
138 | } | |
139 | ||
140 | static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid) | |
141 | { | |
142 | struct gfs2_jdesc *jd; | |
143 | int found = 0; | |
144 | ||
145 | list_for_each_entry(jd, head, jd_list) { | |
146 | if (jd->jd_jid == jid) { | |
147 | found = 1; | |
148 | break; | |
149 | } | |
150 | } | |
151 | ||
152 | if (!found) | |
153 | jd = NULL; | |
154 | ||
155 | return jd; | |
156 | } | |
157 | ||
158 | struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid) | |
159 | { | |
160 | struct gfs2_jdesc *jd; | |
161 | ||
162 | spin_lock(&sdp->sd_jindex_spin); | |
163 | jd = jdesc_find_i(&sdp->sd_jindex_list, jid); | |
164 | spin_unlock(&sdp->sd_jindex_spin); | |
165 | ||
166 | return jd; | |
167 | } | |
168 | ||
169 | void gfs2_jdesc_make_dirty(struct gfs2_sbd *sdp, unsigned int jid) | |
170 | { | |
171 | struct gfs2_jdesc *jd; | |
172 | ||
173 | spin_lock(&sdp->sd_jindex_spin); | |
174 | jd = jdesc_find_i(&sdp->sd_jindex_list, jid); | |
175 | if (jd) | |
176 | jd->jd_dirty = 1; | |
177 | spin_unlock(&sdp->sd_jindex_spin); | |
178 | } | |
179 | ||
180 | struct gfs2_jdesc *gfs2_jdesc_find_dirty(struct gfs2_sbd *sdp) | |
181 | { | |
182 | struct gfs2_jdesc *jd; | |
183 | int found = 0; | |
184 | ||
185 | spin_lock(&sdp->sd_jindex_spin); | |
186 | ||
187 | list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { | |
188 | if (jd->jd_dirty) { | |
189 | jd->jd_dirty = 0; | |
190 | found = 1; | |
191 | break; | |
192 | } | |
193 | } | |
194 | spin_unlock(&sdp->sd_jindex_spin); | |
195 | ||
196 | if (!found) | |
197 | jd = NULL; | |
198 | ||
199 | return jd; | |
200 | } | |
201 | ||
202 | int gfs2_jdesc_check(struct gfs2_jdesc *jd) | |
203 | { | |
feaa7bba SW |
204 | struct gfs2_inode *ip = GFS2_I(jd->jd_inode); |
205 | struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode); | |
b3b94faa DT |
206 | int ar; |
207 | int error; | |
208 | ||
c9e98886 SW |
209 | if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) || |
210 | (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) { | |
b3b94faa DT |
211 | gfs2_consist_inode(ip); |
212 | return -EIO; | |
213 | } | |
c9e98886 | 214 | jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift; |
b3b94faa | 215 | |
c9e98886 | 216 | error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar); |
b3b94faa DT |
217 | if (!error && ar) { |
218 | gfs2_consist_inode(ip); | |
219 | error = -EIO; | |
220 | } | |
221 | ||
222 | return error; | |
223 | } | |
224 | ||
b3b94faa DT |
225 | /** |
226 | * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one | |
227 | * @sdp: the filesystem | |
228 | * | |
229 | * Returns: errno | |
230 | */ | |
231 | ||
232 | int gfs2_make_fs_rw(struct gfs2_sbd *sdp) | |
233 | { | |
feaa7bba | 234 | struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode); |
5c676f6d | 235 | struct gfs2_glock *j_gl = ip->i_gl; |
b3b94faa | 236 | struct gfs2_holder t_gh; |
55167622 | 237 | struct gfs2_log_header_host head; |
b3b94faa DT |
238 | int error; |
239 | ||
1c0f4872 | 240 | error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh); |
b3b94faa DT |
241 | if (error) |
242 | return error; | |
243 | ||
1a14d3a6 | 244 | j_gl->gl_ops->go_inval(j_gl, DIO_METADATA); |
b3b94faa DT |
245 | |
246 | error = gfs2_find_jhead(sdp->sd_jdesc, &head); | |
247 | if (error) | |
248 | goto fail; | |
249 | ||
250 | if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { | |
251 | gfs2_consist(sdp); | |
252 | error = -EIO; | |
253 | goto fail; | |
254 | } | |
255 | ||
256 | /* Initialize some head of the log stuff */ | |
257 | sdp->sd_log_sequence = head.lh_sequence + 1; | |
258 | gfs2_log_pointers_init(sdp, head.lh_blkno); | |
259 | ||
b3b94faa DT |
260 | error = gfs2_quota_init(sdp); |
261 | if (error) | |
a91ea69f | 262 | goto fail; |
b3b94faa DT |
263 | |
264 | set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags); | |
265 | ||
266 | gfs2_glock_dq_uninit(&t_gh); | |
267 | ||
268 | return 0; | |
269 | ||
a91ea69f | 270 | fail: |
b3b94faa DT |
271 | t_gh.gh_flags |= GL_NOCACHE; |
272 | gfs2_glock_dq_uninit(&t_gh); | |
273 | ||
274 | return error; | |
275 | } | |
276 | ||
bb8d8a6f SW |
277 | static void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf) |
278 | { | |
279 | const struct gfs2_statfs_change *str = buf; | |
280 | ||
281 | sc->sc_total = be64_to_cpu(str->sc_total); | |
282 | sc->sc_free = be64_to_cpu(str->sc_free); | |
283 | sc->sc_dinodes = be64_to_cpu(str->sc_dinodes); | |
284 | } | |
285 | ||
286 | static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf) | |
287 | { | |
288 | struct gfs2_statfs_change *str = buf; | |
289 | ||
290 | str->sc_total = cpu_to_be64(sc->sc_total); | |
291 | str->sc_free = cpu_to_be64(sc->sc_free); | |
292 | str->sc_dinodes = cpu_to_be64(sc->sc_dinodes); | |
293 | } | |
294 | ||
b3b94faa DT |
295 | int gfs2_statfs_init(struct gfs2_sbd *sdp) |
296 | { | |
feaa7bba | 297 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
bd209cc0 | 298 | struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; |
feaa7bba | 299 | struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); |
bd209cc0 | 300 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; |
b3b94faa DT |
301 | struct buffer_head *m_bh, *l_bh; |
302 | struct gfs2_holder gh; | |
303 | int error; | |
304 | ||
305 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, | |
306 | &gh); | |
307 | if (error) | |
308 | return error; | |
309 | ||
310 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
311 | if (error) | |
312 | goto out; | |
313 | ||
314 | if (sdp->sd_args.ar_spectator) { | |
315 | spin_lock(&sdp->sd_statfs_spin); | |
316 | gfs2_statfs_change_in(m_sc, m_bh->b_data + | |
317 | sizeof(struct gfs2_dinode)); | |
318 | spin_unlock(&sdp->sd_statfs_spin); | |
319 | } else { | |
320 | error = gfs2_meta_inode_buffer(l_ip, &l_bh); | |
321 | if (error) | |
322 | goto out_m_bh; | |
323 | ||
324 | spin_lock(&sdp->sd_statfs_spin); | |
325 | gfs2_statfs_change_in(m_sc, m_bh->b_data + | |
326 | sizeof(struct gfs2_dinode)); | |
327 | gfs2_statfs_change_in(l_sc, l_bh->b_data + | |
328 | sizeof(struct gfs2_dinode)); | |
329 | spin_unlock(&sdp->sd_statfs_spin); | |
330 | ||
331 | brelse(l_bh); | |
332 | } | |
333 | ||
a91ea69f | 334 | out_m_bh: |
b3b94faa | 335 | brelse(m_bh); |
a91ea69f | 336 | out: |
b3b94faa | 337 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
338 | return 0; |
339 | } | |
340 | ||
cd915493 SW |
341 | void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free, |
342 | s64 dinodes) | |
b3b94faa | 343 | { |
feaa7bba | 344 | struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); |
bd209cc0 | 345 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; |
b3b94faa DT |
346 | struct buffer_head *l_bh; |
347 | int error; | |
348 | ||
349 | error = gfs2_meta_inode_buffer(l_ip, &l_bh); | |
350 | if (error) | |
351 | return; | |
352 | ||
d4e9c4c3 | 353 | gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1); |
b3b94faa DT |
354 | |
355 | spin_lock(&sdp->sd_statfs_spin); | |
356 | l_sc->sc_total += total; | |
357 | l_sc->sc_free += free; | |
358 | l_sc->sc_dinodes += dinodes; | |
907b9bce | 359 | gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode)); |
b3b94faa DT |
360 | spin_unlock(&sdp->sd_statfs_spin); |
361 | ||
362 | brelse(l_bh); | |
363 | } | |
364 | ||
365 | int gfs2_statfs_sync(struct gfs2_sbd *sdp) | |
366 | { | |
feaa7bba SW |
367 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode); |
368 | struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode); | |
bd209cc0 AV |
369 | struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; |
370 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; | |
b3b94faa DT |
371 | struct gfs2_holder gh; |
372 | struct buffer_head *m_bh, *l_bh; | |
373 | int error; | |
374 | ||
375 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE, | |
376 | &gh); | |
377 | if (error) | |
378 | return error; | |
379 | ||
380 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); | |
381 | if (error) | |
382 | goto out; | |
383 | ||
384 | spin_lock(&sdp->sd_statfs_spin); | |
385 | gfs2_statfs_change_in(m_sc, m_bh->b_data + | |
907b9bce | 386 | sizeof(struct gfs2_dinode)); |
b3b94faa DT |
387 | if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) { |
388 | spin_unlock(&sdp->sd_statfs_spin); | |
389 | goto out_bh; | |
390 | } | |
391 | spin_unlock(&sdp->sd_statfs_spin); | |
392 | ||
393 | error = gfs2_meta_inode_buffer(l_ip, &l_bh); | |
394 | if (error) | |
395 | goto out_bh; | |
396 | ||
397 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); | |
398 | if (error) | |
399 | goto out_bh2; | |
400 | ||
d4e9c4c3 | 401 | gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1); |
b3b94faa DT |
402 | |
403 | spin_lock(&sdp->sd_statfs_spin); | |
404 | m_sc->sc_total += l_sc->sc_total; | |
405 | m_sc->sc_free += l_sc->sc_free; | |
406 | m_sc->sc_dinodes += l_sc->sc_dinodes; | |
407 | memset(l_sc, 0, sizeof(struct gfs2_statfs_change)); | |
408 | memset(l_bh->b_data + sizeof(struct gfs2_dinode), | |
409 | 0, sizeof(struct gfs2_statfs_change)); | |
410 | spin_unlock(&sdp->sd_statfs_spin); | |
411 | ||
d4e9c4c3 | 412 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
b3b94faa DT |
413 | gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode)); |
414 | ||
415 | gfs2_trans_end(sdp); | |
416 | ||
a91ea69f | 417 | out_bh2: |
b3b94faa | 418 | brelse(l_bh); |
a91ea69f | 419 | out_bh: |
b3b94faa | 420 | brelse(m_bh); |
a91ea69f | 421 | out: |
b3b94faa | 422 | gfs2_glock_dq_uninit(&gh); |
b3b94faa DT |
423 | return error; |
424 | } | |
425 | ||
426 | /** | |
427 | * gfs2_statfs_i - Do a statfs | |
428 | * @sdp: the filesystem | |
429 | * @sg: the sg structure | |
430 | * | |
431 | * Returns: errno | |
432 | */ | |
433 | ||
bd209cc0 | 434 | int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) |
b3b94faa | 435 | { |
bd209cc0 AV |
436 | struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master; |
437 | struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local; | |
b3b94faa DT |
438 | |
439 | spin_lock(&sdp->sd_statfs_spin); | |
440 | ||
441 | *sc = *m_sc; | |
442 | sc->sc_total += l_sc->sc_total; | |
443 | sc->sc_free += l_sc->sc_free; | |
444 | sc->sc_dinodes += l_sc->sc_dinodes; | |
445 | ||
446 | spin_unlock(&sdp->sd_statfs_spin); | |
447 | ||
448 | if (sc->sc_free < 0) | |
449 | sc->sc_free = 0; | |
450 | if (sc->sc_free > sc->sc_total) | |
451 | sc->sc_free = sc->sc_total; | |
452 | if (sc->sc_dinodes < 0) | |
453 | sc->sc_dinodes = 0; | |
454 | ||
455 | return 0; | |
456 | } | |
457 | ||
458 | /** | |
459 | * statfs_fill - fill in the sg for a given RG | |
460 | * @rgd: the RG | |
461 | * @sc: the sc structure | |
462 | * | |
463 | * Returns: 0 on success, -ESTALE if the LVB is invalid | |
464 | */ | |
465 | ||
466 | static int statfs_slow_fill(struct gfs2_rgrpd *rgd, | |
bd209cc0 | 467 | struct gfs2_statfs_change_host *sc) |
b3b94faa DT |
468 | { |
469 | gfs2_rgrp_verify(rgd); | |
bb8d8a6f | 470 | sc->sc_total += rgd->rd_data; |
b3b94faa DT |
471 | sc->sc_free += rgd->rd_rg.rg_free; |
472 | sc->sc_dinodes += rgd->rd_rg.rg_dinodes; | |
473 | return 0; | |
474 | } | |
475 | ||
476 | /** | |
477 | * gfs2_statfs_slow - Stat a filesystem using asynchronous locking | |
478 | * @sdp: the filesystem | |
479 | * @sc: the sc info that will be returned | |
480 | * | |
481 | * Any error (other than a signal) will cause this routine to fall back | |
482 | * to the synchronous version. | |
483 | * | |
484 | * FIXME: This really shouldn't busy wait like this. | |
485 | * | |
486 | * Returns: errno | |
487 | */ | |
488 | ||
bd209cc0 | 489 | int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc) |
b3b94faa DT |
490 | { |
491 | struct gfs2_holder ri_gh; | |
492 | struct gfs2_rgrpd *rgd_next; | |
493 | struct gfs2_holder *gha, *gh; | |
494 | unsigned int slots = 64; | |
495 | unsigned int x; | |
496 | int done; | |
497 | int error = 0, err; | |
498 | ||
bd209cc0 | 499 | memset(sc, 0, sizeof(struct gfs2_statfs_change_host)); |
b3b94faa DT |
500 | gha = kcalloc(slots, sizeof(struct gfs2_holder), GFP_KERNEL); |
501 | if (!gha) | |
502 | return -ENOMEM; | |
503 | ||
504 | error = gfs2_rindex_hold(sdp, &ri_gh); | |
505 | if (error) | |
506 | goto out; | |
507 | ||
508 | rgd_next = gfs2_rgrpd_get_first(sdp); | |
509 | ||
510 | for (;;) { | |
511 | done = 1; | |
512 | ||
513 | for (x = 0; x < slots; x++) { | |
514 | gh = gha + x; | |
515 | ||
516 | if (gh->gh_gl && gfs2_glock_poll(gh)) { | |
517 | err = gfs2_glock_wait(gh); | |
518 | if (err) { | |
519 | gfs2_holder_uninit(gh); | |
520 | error = err; | |
521 | } else { | |
522 | if (!error) | |
5c676f6d SW |
523 | error = statfs_slow_fill( |
524 | gh->gh_gl->gl_object, sc); | |
b3b94faa DT |
525 | gfs2_glock_dq_uninit(gh); |
526 | } | |
527 | } | |
528 | ||
529 | if (gh->gh_gl) | |
530 | done = 0; | |
531 | else if (rgd_next && !error) { | |
532 | error = gfs2_glock_nq_init(rgd_next->rd_gl, | |
533 | LM_ST_SHARED, | |
534 | GL_ASYNC, | |
535 | gh); | |
536 | rgd_next = gfs2_rgrpd_get_next(rgd_next); | |
537 | done = 0; | |
538 | } | |
539 | ||
540 | if (signal_pending(current)) | |
541 | error = -ERESTARTSYS; | |
542 | } | |
543 | ||
544 | if (done) | |
545 | break; | |
546 | ||
547 | yield(); | |
548 | } | |
549 | ||
550 | gfs2_glock_dq_uninit(&ri_gh); | |
551 | ||
a91ea69f | 552 | out: |
b3b94faa | 553 | kfree(gha); |
b3b94faa DT |
554 | return error; |
555 | } | |
556 | ||
557 | struct lfcc { | |
558 | struct list_head list; | |
559 | struct gfs2_holder gh; | |
560 | }; | |
561 | ||
562 | /** | |
563 | * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all | |
564 | * journals are clean | |
565 | * @sdp: the file system | |
566 | * @state: the state to put the transaction lock into | |
567 | * @t_gh: the hold on the transaction lock | |
568 | * | |
569 | * Returns: errno | |
570 | */ | |
571 | ||
08bc2dbc AB |
572 | static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp, |
573 | struct gfs2_holder *t_gh) | |
b3b94faa | 574 | { |
5c676f6d | 575 | struct gfs2_inode *ip; |
b3b94faa DT |
576 | struct gfs2_holder ji_gh; |
577 | struct gfs2_jdesc *jd; | |
578 | struct lfcc *lfcc; | |
579 | LIST_HEAD(list); | |
55167622 | 580 | struct gfs2_log_header_host lh; |
b3b94faa DT |
581 | int error; |
582 | ||
583 | error = gfs2_jindex_hold(sdp, &ji_gh); | |
584 | if (error) | |
585 | return error; | |
586 | ||
587 | list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { | |
588 | lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL); | |
589 | if (!lfcc) { | |
590 | error = -ENOMEM; | |
591 | goto out; | |
592 | } | |
feaa7bba SW |
593 | ip = GFS2_I(jd->jd_inode); |
594 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh); | |
b3b94faa DT |
595 | if (error) { |
596 | kfree(lfcc); | |
597 | goto out; | |
598 | } | |
599 | list_add(&lfcc->list, &list); | |
600 | } | |
601 | ||
602 | error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_DEFERRED, | |
6802e340 | 603 | GL_NOCACHE, t_gh); |
b3b94faa DT |
604 | |
605 | list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) { | |
606 | error = gfs2_jdesc_check(jd); | |
607 | if (error) | |
608 | break; | |
609 | error = gfs2_find_jhead(jd, &lh); | |
610 | if (error) | |
611 | break; | |
612 | if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) { | |
613 | error = -EBUSY; | |
614 | break; | |
615 | } | |
616 | } | |
617 | ||
618 | if (error) | |
619 | gfs2_glock_dq_uninit(t_gh); | |
620 | ||
a91ea69f | 621 | out: |
b3b94faa DT |
622 | while (!list_empty(&list)) { |
623 | lfcc = list_entry(list.next, struct lfcc, list); | |
624 | list_del(&lfcc->list); | |
625 | gfs2_glock_dq_uninit(&lfcc->gh); | |
626 | kfree(lfcc); | |
627 | } | |
628 | gfs2_glock_dq_uninit(&ji_gh); | |
b3b94faa DT |
629 | return error; |
630 | } | |
631 | ||
632 | /** | |
633 | * gfs2_freeze_fs - freezes the file system | |
634 | * @sdp: the file system | |
635 | * | |
636 | * This function flushes data and meta data for all machines by | |
637 | * aquiring the transaction log exclusively. All journals are | |
638 | * ensured to be in a clean state as well. | |
639 | * | |
640 | * Returns: errno | |
641 | */ | |
642 | ||
643 | int gfs2_freeze_fs(struct gfs2_sbd *sdp) | |
644 | { | |
645 | int error = 0; | |
646 | ||
f55ab26a | 647 | mutex_lock(&sdp->sd_freeze_lock); |
b3b94faa DT |
648 | |
649 | if (!sdp->sd_freeze_count++) { | |
650 | error = gfs2_lock_fs_check_clean(sdp, &sdp->sd_freeze_gh); | |
651 | if (error) | |
652 | sdp->sd_freeze_count--; | |
653 | } | |
654 | ||
f55ab26a | 655 | mutex_unlock(&sdp->sd_freeze_lock); |
b3b94faa DT |
656 | |
657 | return error; | |
658 | } | |
659 | ||
660 | /** | |
661 | * gfs2_unfreeze_fs - unfreezes the file system | |
662 | * @sdp: the file system | |
663 | * | |
664 | * This function allows the file system to proceed by unlocking | |
665 | * the exclusively held transaction lock. Other GFS2 nodes are | |
666 | * now free to acquire the lock shared and go on with their lives. | |
667 | * | |
668 | */ | |
669 | ||
670 | void gfs2_unfreeze_fs(struct gfs2_sbd *sdp) | |
671 | { | |
f55ab26a | 672 | mutex_lock(&sdp->sd_freeze_lock); |
b3b94faa DT |
673 | |
674 | if (sdp->sd_freeze_count && !--sdp->sd_freeze_count) | |
675 | gfs2_glock_dq_uninit(&sdp->sd_freeze_gh); | |
676 | ||
f55ab26a | 677 | mutex_unlock(&sdp->sd_freeze_lock); |
b3b94faa DT |
678 | } |
679 |