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