1 /*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
3 * Copyright (C) 2004-2007 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/crc32.h>
16 #include <linux/gfs2_ondisk.h>
17 #include <linux/bio.h>
18 #include <linux/lm_interface.h>
19
20 #include "gfs2.h"
21 #include "incore.h"
22 #include "bmap.h"
23 #include "dir.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 "util.h"
35
36 /**
37 * gfs2_jindex_free - Clear all the journal index information
38 * @sdp: The GFS2 superblock
39 *
40 */
41
gfs2_jindex_free(struct gfs2_sbd * sdp)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
jdesc_find_i(struct list_head * head,unsigned int jid)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
gfs2_jdesc_find(struct gfs2_sbd * sdp,unsigned int jid)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
gfs2_jdesc_check(struct gfs2_jdesc * jd)99 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
100 {
101 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
102 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
103 int ar;
104 int error;
105
106 if (ip->i_disksize < (8 << 20) || ip->i_disksize > (1 << 30) ||
107 (ip->i_disksize & (sdp->sd_sb.sb_bsize - 1))) {
108 gfs2_consist_inode(ip);
109 return -EIO;
110 }
111 jd->jd_blocks = ip->i_disksize >> sdp->sd_sb.sb_bsize_shift;
112
113 error = gfs2_write_alloc_required(ip, 0, ip->i_disksize, &ar);
114 if (!error && ar) {
115 gfs2_consist_inode(ip);
116 error = -EIO;
117 }
118
119 return error;
120 }
121
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
gfs2_make_fs_rw(struct gfs2_sbd * sdp)129 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
130 {
131 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
132 struct gfs2_glock *j_gl = ip->i_gl;
133 struct gfs2_holder t_gh;
134 struct gfs2_log_header_host head;
135 int error;
136
137 error = gfs2_glock_nq_init(sdp->sd_trans_gl, LM_ST_SHARED, 0, &t_gh);
138 if (error)
139 return error;
140
141 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
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
157 error = gfs2_quota_init(sdp);
158 if (error)
159 goto fail;
160
161 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
162
163 gfs2_glock_dq_uninit(&t_gh);
164
165 return 0;
166
167 fail:
168 t_gh.gh_flags |= GL_NOCACHE;
169 gfs2_glock_dq_uninit(&t_gh);
170
171 return error;
172 }
173
gfs2_statfs_change_in(struct gfs2_statfs_change_host * sc,const void * buf)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
gfs2_statfs_change_out(const struct gfs2_statfs_change_host * sc,void * buf)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
gfs2_statfs_init(struct gfs2_sbd * sdp)192 int gfs2_statfs_init(struct gfs2_sbd *sdp)
193 {
194 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
195 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
196 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
197 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
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
231 out_m_bh:
232 brelse(m_bh);
233 out:
234 gfs2_glock_dq_uninit(&gh);
235 return 0;
236 }
237
gfs2_statfs_change(struct gfs2_sbd * sdp,s64 total,s64 free,s64 dinodes)238 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
239 s64 dinodes)
240 {
241 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
242 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
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
250 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
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;
256 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
257 spin_unlock(&sdp->sd_statfs_spin);
258
259 brelse(l_bh);
260 }
261
gfs2_statfs_sync(struct gfs2_sbd * sdp)262 int gfs2_statfs_sync(struct gfs2_sbd *sdp)
263 {
264 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
265 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
266 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
267 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
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 +
283 sizeof(struct gfs2_dinode));
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
298 gfs2_trans_add_bh(l_ip->i_gl, l_bh, 1);
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
309 gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1);
310 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
311
312 gfs2_trans_end(sdp);
313
314 out_bh2:
315 brelse(l_bh);
316 out_bh:
317 brelse(m_bh);
318 out:
319 gfs2_glock_dq_uninit(&gh);
320 return error;
321 }
322
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
gfs2_lock_fs_check_clean(struct gfs2_sbd * sdp,struct gfs2_holder * t_gh)338 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp,
339 struct gfs2_holder *t_gh)
340 {
341 struct gfs2_inode *ip;
342 struct gfs2_holder ji_gh;
343 struct gfs2_jdesc *jd;
344 struct lfcc *lfcc;
345 LIST_HEAD(list);
346 struct gfs2_log_header_host lh;
347 int error;
348
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 }
355 ip = GFS2_I(jd->jd_inode);
356 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
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,
365 GL_NOCACHE, t_gh);
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
383 out:
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);
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
gfs2_freeze_fs(struct gfs2_sbd * sdp)405 int gfs2_freeze_fs(struct gfs2_sbd *sdp)
406 {
407 int error = 0;
408
409 mutex_lock(&sdp->sd_freeze_lock);
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
417 mutex_unlock(&sdp->sd_freeze_lock);
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
gfs2_unfreeze_fs(struct gfs2_sbd * sdp)432 void gfs2_unfreeze_fs(struct gfs2_sbd *sdp)
433 {
434 mutex_lock(&sdp->sd_freeze_lock);
435
436 if (sdp->sd_freeze_count && !--sdp->sd_freeze_count)
437 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
438
439 mutex_unlock(&sdp->sd_freeze_lock);
440 }
441
442