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Merge tag 'io_uring-5.7-2020-05-22' of git://git.kernel.dk/linux-block
[thirdparty/linux.git] / fs / gfs2 / super.c
1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
4 * Copyright (C) 2004-2007 Red Hat, Inc. All rights reserved.
5 */
6
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8
9 #include <linux/bio.h>
10 #include <linux/sched/signal.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/statfs.h>
16 #include <linux/seq_file.h>
17 #include <linux/mount.h>
18 #include <linux/kthread.h>
19 #include <linux/delay.h>
20 #include <linux/gfs2_ondisk.h>
21 #include <linux/crc32.h>
22 #include <linux/time.h>
23 #include <linux/wait.h>
24 #include <linux/writeback.h>
25 #include <linux/backing-dev.h>
26 #include <linux/kernel.h>
27
28 #include "gfs2.h"
29 #include "incore.h"
30 #include "bmap.h"
31 #include "dir.h"
32 #include "glock.h"
33 #include "glops.h"
34 #include "inode.h"
35 #include "log.h"
36 #include "meta_io.h"
37 #include "quota.h"
38 #include "recovery.h"
39 #include "rgrp.h"
40 #include "super.h"
41 #include "trans.h"
42 #include "util.h"
43 #include "sys.h"
44 #include "xattr.h"
45 #include "lops.h"
46
47 /**
48 * gfs2_jindex_free - Clear all the journal index information
49 * @sdp: The GFS2 superblock
50 *
51 */
52
53 void gfs2_jindex_free(struct gfs2_sbd *sdp)
54 {
55 struct list_head list;
56 struct gfs2_jdesc *jd;
57
58 spin_lock(&sdp->sd_jindex_spin);
59 list_add(&list, &sdp->sd_jindex_list);
60 list_del_init(&sdp->sd_jindex_list);
61 sdp->sd_journals = 0;
62 spin_unlock(&sdp->sd_jindex_spin);
63
64 sdp->sd_jdesc = NULL;
65 while (!list_empty(&list)) {
66 jd = list_first_entry(&list, struct gfs2_jdesc, jd_list);
67 gfs2_free_journal_extents(jd);
68 list_del(&jd->jd_list);
69 iput(jd->jd_inode);
70 jd->jd_inode = NULL;
71 kfree(jd);
72 }
73 }
74
75 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
76 {
77 struct gfs2_jdesc *jd;
78 int found = 0;
79
80 list_for_each_entry(jd, head, jd_list) {
81 if (jd->jd_jid == jid) {
82 found = 1;
83 break;
84 }
85 }
86
87 if (!found)
88 jd = NULL;
89
90 return jd;
91 }
92
93 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
94 {
95 struct gfs2_jdesc *jd;
96
97 spin_lock(&sdp->sd_jindex_spin);
98 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
99 spin_unlock(&sdp->sd_jindex_spin);
100
101 return jd;
102 }
103
104 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
105 {
106 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
107 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
108 u64 size = i_size_read(jd->jd_inode);
109
110 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30)))
111 return -EIO;
112
113 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
114
115 if (gfs2_write_alloc_required(ip, 0, size)) {
116 gfs2_consist_inode(ip);
117 return -EIO;
118 }
119
120 return 0;
121 }
122
123 static int init_threads(struct gfs2_sbd *sdp)
124 {
125 struct task_struct *p;
126 int error = 0;
127
128 p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
129 if (IS_ERR(p)) {
130 error = PTR_ERR(p);
131 fs_err(sdp, "can't start logd thread: %d\n", error);
132 return error;
133 }
134 sdp->sd_logd_process = p;
135
136 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
137 if (IS_ERR(p)) {
138 error = PTR_ERR(p);
139 fs_err(sdp, "can't start quotad thread: %d\n", error);
140 goto fail;
141 }
142 sdp->sd_quotad_process = p;
143 return 0;
144
145 fail:
146 kthread_stop(sdp->sd_logd_process);
147 sdp->sd_logd_process = NULL;
148 return error;
149 }
150
151 /**
152 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
153 * @sdp: the filesystem
154 *
155 * Returns: errno
156 */
157
158 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
159 {
160 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
161 struct gfs2_glock *j_gl = ip->i_gl;
162 struct gfs2_holder freeze_gh;
163 struct gfs2_log_header_host head;
164 int error;
165
166 error = init_threads(sdp);
167 if (error)
168 return error;
169
170 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
171 &freeze_gh);
172 if (error)
173 goto fail_threads;
174
175 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
176 if (gfs2_withdrawn(sdp)) {
177 error = -EIO;
178 goto fail;
179 }
180
181 error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
182 if (error || gfs2_withdrawn(sdp))
183 goto fail;
184
185 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
186 gfs2_consist(sdp);
187 error = -EIO;
188 goto fail;
189 }
190
191 /* Initialize some head of the log stuff */
192 sdp->sd_log_sequence = head.lh_sequence + 1;
193 gfs2_log_pointers_init(sdp, head.lh_blkno);
194
195 error = gfs2_quota_init(sdp);
196 if (error || gfs2_withdrawn(sdp))
197 goto fail;
198
199 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
200
201 gfs2_glock_dq_uninit(&freeze_gh);
202
203 return 0;
204
205 fail:
206 freeze_gh.gh_flags |= GL_NOCACHE;
207 gfs2_glock_dq_uninit(&freeze_gh);
208 fail_threads:
209 if (sdp->sd_quotad_process)
210 kthread_stop(sdp->sd_quotad_process);
211 sdp->sd_quotad_process = NULL;
212 if (sdp->sd_logd_process)
213 kthread_stop(sdp->sd_logd_process);
214 sdp->sd_logd_process = NULL;
215 return error;
216 }
217
218 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
219 {
220 const struct gfs2_statfs_change *str = buf;
221
222 sc->sc_total = be64_to_cpu(str->sc_total);
223 sc->sc_free = be64_to_cpu(str->sc_free);
224 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
225 }
226
227 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
228 {
229 struct gfs2_statfs_change *str = buf;
230
231 str->sc_total = cpu_to_be64(sc->sc_total);
232 str->sc_free = cpu_to_be64(sc->sc_free);
233 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
234 }
235
236 int gfs2_statfs_init(struct gfs2_sbd *sdp)
237 {
238 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
239 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
240 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
241 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
242 struct buffer_head *m_bh, *l_bh;
243 struct gfs2_holder gh;
244 int error;
245
246 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
247 &gh);
248 if (error)
249 return error;
250
251 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
252 if (error)
253 goto out;
254
255 if (sdp->sd_args.ar_spectator) {
256 spin_lock(&sdp->sd_statfs_spin);
257 gfs2_statfs_change_in(m_sc, m_bh->b_data +
258 sizeof(struct gfs2_dinode));
259 spin_unlock(&sdp->sd_statfs_spin);
260 } else {
261 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
262 if (error)
263 goto out_m_bh;
264
265 spin_lock(&sdp->sd_statfs_spin);
266 gfs2_statfs_change_in(m_sc, m_bh->b_data +
267 sizeof(struct gfs2_dinode));
268 gfs2_statfs_change_in(l_sc, l_bh->b_data +
269 sizeof(struct gfs2_dinode));
270 spin_unlock(&sdp->sd_statfs_spin);
271
272 brelse(l_bh);
273 }
274
275 out_m_bh:
276 brelse(m_bh);
277 out:
278 gfs2_glock_dq_uninit(&gh);
279 return 0;
280 }
281
282 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
283 s64 dinodes)
284 {
285 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
286 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
287 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
288 struct buffer_head *l_bh;
289 s64 x, y;
290 int need_sync = 0;
291 int error;
292
293 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
294 if (error)
295 return;
296
297 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
298
299 spin_lock(&sdp->sd_statfs_spin);
300 l_sc->sc_total += total;
301 l_sc->sc_free += free;
302 l_sc->sc_dinodes += dinodes;
303 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
304 if (sdp->sd_args.ar_statfs_percent) {
305 x = 100 * l_sc->sc_free;
306 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
307 if (x >= y || x <= -y)
308 need_sync = 1;
309 }
310 spin_unlock(&sdp->sd_statfs_spin);
311
312 brelse(l_bh);
313 if (need_sync)
314 gfs2_wake_up_statfs(sdp);
315 }
316
317 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
318 struct buffer_head *l_bh)
319 {
320 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
321 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
322 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
323 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
324
325 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
326 gfs2_trans_add_meta(m_ip->i_gl, m_bh);
327
328 spin_lock(&sdp->sd_statfs_spin);
329 m_sc->sc_total += l_sc->sc_total;
330 m_sc->sc_free += l_sc->sc_free;
331 m_sc->sc_dinodes += l_sc->sc_dinodes;
332 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
333 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
334 0, sizeof(struct gfs2_statfs_change));
335 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
336 spin_unlock(&sdp->sd_statfs_spin);
337 }
338
339 int gfs2_statfs_sync(struct super_block *sb, int type)
340 {
341 struct gfs2_sbd *sdp = sb->s_fs_info;
342 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
343 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
344 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
345 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
346 struct gfs2_holder gh;
347 struct buffer_head *m_bh, *l_bh;
348 int error;
349
350 sb_start_write(sb);
351 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
352 &gh);
353 if (error)
354 goto out;
355
356 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
357 if (error)
358 goto out_unlock;
359
360 spin_lock(&sdp->sd_statfs_spin);
361 gfs2_statfs_change_in(m_sc, m_bh->b_data +
362 sizeof(struct gfs2_dinode));
363 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
364 spin_unlock(&sdp->sd_statfs_spin);
365 goto out_bh;
366 }
367 spin_unlock(&sdp->sd_statfs_spin);
368
369 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
370 if (error)
371 goto out_bh;
372
373 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
374 if (error)
375 goto out_bh2;
376
377 update_statfs(sdp, m_bh, l_bh);
378 sdp->sd_statfs_force_sync = 0;
379
380 gfs2_trans_end(sdp);
381
382 out_bh2:
383 brelse(l_bh);
384 out_bh:
385 brelse(m_bh);
386 out_unlock:
387 gfs2_glock_dq_uninit(&gh);
388 out:
389 sb_end_write(sb);
390 return error;
391 }
392
393 struct lfcc {
394 struct list_head list;
395 struct gfs2_holder gh;
396 };
397
398 /**
399 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
400 * journals are clean
401 * @sdp: the file system
402 * @state: the state to put the transaction lock into
403 * @t_gh: the hold on the transaction lock
404 *
405 * Returns: errno
406 */
407
408 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp)
409 {
410 struct gfs2_inode *ip;
411 struct gfs2_jdesc *jd;
412 struct lfcc *lfcc;
413 LIST_HEAD(list);
414 struct gfs2_log_header_host lh;
415 int error;
416
417 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
418 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
419 if (!lfcc) {
420 error = -ENOMEM;
421 goto out;
422 }
423 ip = GFS2_I(jd->jd_inode);
424 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
425 if (error) {
426 kfree(lfcc);
427 goto out;
428 }
429 list_add(&lfcc->list, &list);
430 }
431
432 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
433 GL_NOCACHE, &sdp->sd_freeze_gh);
434 if (error)
435 goto out;
436
437 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
438 error = gfs2_jdesc_check(jd);
439 if (error)
440 break;
441 error = gfs2_find_jhead(jd, &lh, false);
442 if (error)
443 break;
444 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
445 error = -EBUSY;
446 break;
447 }
448 }
449
450 if (error)
451 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
452
453 out:
454 while (!list_empty(&list)) {
455 lfcc = list_first_entry(&list, struct lfcc, list);
456 list_del(&lfcc->list);
457 gfs2_glock_dq_uninit(&lfcc->gh);
458 kfree(lfcc);
459 }
460 return error;
461 }
462
463 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
464 {
465 struct gfs2_dinode *str = buf;
466
467 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
468 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
469 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
470 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
471 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
472 str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
473 str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
474 str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
475 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
476 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
477 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
478 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
479 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
480 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
481
482 str->di_goal_meta = cpu_to_be64(ip->i_goal);
483 str->di_goal_data = cpu_to_be64(ip->i_goal);
484 str->di_generation = cpu_to_be64(ip->i_generation);
485
486 str->di_flags = cpu_to_be32(ip->i_diskflags);
487 str->di_height = cpu_to_be16(ip->i_height);
488 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
489 !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
490 GFS2_FORMAT_DE : 0);
491 str->di_depth = cpu_to_be16(ip->i_depth);
492 str->di_entries = cpu_to_be32(ip->i_entries);
493
494 str->di_eattr = cpu_to_be64(ip->i_eattr);
495 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
496 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
497 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
498 }
499
500 /**
501 * gfs2_write_inode - Make sure the inode is stable on the disk
502 * @inode: The inode
503 * @wbc: The writeback control structure
504 *
505 * Returns: errno
506 */
507
508 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
509 {
510 struct gfs2_inode *ip = GFS2_I(inode);
511 struct gfs2_sbd *sdp = GFS2_SB(inode);
512 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
513 struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
514 int ret = 0;
515 bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
516
517 if (flush_all)
518 gfs2_log_flush(GFS2_SB(inode), ip->i_gl,
519 GFS2_LOG_HEAD_FLUSH_NORMAL |
520 GFS2_LFC_WRITE_INODE);
521 if (bdi->wb.dirty_exceeded)
522 gfs2_ail1_flush(sdp, wbc);
523 else
524 filemap_fdatawrite(metamapping);
525 if (flush_all)
526 ret = filemap_fdatawait(metamapping);
527 if (ret)
528 mark_inode_dirty_sync(inode);
529 else {
530 spin_lock(&inode->i_lock);
531 if (!(inode->i_flags & I_DIRTY))
532 gfs2_ordered_del_inode(ip);
533 spin_unlock(&inode->i_lock);
534 }
535 return ret;
536 }
537
538 /**
539 * gfs2_dirty_inode - check for atime updates
540 * @inode: The inode in question
541 * @flags: The type of dirty
542 *
543 * Unfortunately it can be called under any combination of inode
544 * glock and transaction lock, so we have to check carefully.
545 *
546 * At the moment this deals only with atime - it should be possible
547 * to expand that role in future, once a review of the locking has
548 * been carried out.
549 */
550
551 static void gfs2_dirty_inode(struct inode *inode, int flags)
552 {
553 struct gfs2_inode *ip = GFS2_I(inode);
554 struct gfs2_sbd *sdp = GFS2_SB(inode);
555 struct buffer_head *bh;
556 struct gfs2_holder gh;
557 int need_unlock = 0;
558 int need_endtrans = 0;
559 int ret;
560
561 if (!(flags & I_DIRTY_INODE))
562 return;
563 if (unlikely(gfs2_withdrawn(sdp)))
564 return;
565 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
566 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
567 if (ret) {
568 fs_err(sdp, "dirty_inode: glock %d\n", ret);
569 return;
570 }
571 need_unlock = 1;
572 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
573 return;
574
575 if (current->journal_info == NULL) {
576 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
577 if (ret) {
578 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
579 goto out;
580 }
581 need_endtrans = 1;
582 }
583
584 ret = gfs2_meta_inode_buffer(ip, &bh);
585 if (ret == 0) {
586 gfs2_trans_add_meta(ip->i_gl, bh);
587 gfs2_dinode_out(ip, bh->b_data);
588 brelse(bh);
589 }
590
591 if (need_endtrans)
592 gfs2_trans_end(sdp);
593 out:
594 if (need_unlock)
595 gfs2_glock_dq_uninit(&gh);
596 }
597
598 /**
599 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
600 * @sdp: the filesystem
601 *
602 * Returns: errno
603 */
604
605 int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
606 {
607 struct gfs2_holder freeze_gh;
608 int error = 0;
609 int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
610
611 gfs2_holder_mark_uninitialized(&freeze_gh);
612 if (sdp->sd_freeze_gl &&
613 !gfs2_glock_is_locked_by_me(sdp->sd_freeze_gl)) {
614 if (!log_write_allowed) {
615 error = gfs2_glock_nq_init(sdp->sd_freeze_gl,
616 LM_ST_SHARED, GL_NOCACHE |
617 LM_FLAG_TRY, &freeze_gh);
618 if (error == GLR_TRYFAILED)
619 error = 0;
620 } else {
621 error = gfs2_glock_nq_init(sdp->sd_freeze_gl,
622 LM_ST_SHARED, GL_NOCACHE,
623 &freeze_gh);
624 if (error && !gfs2_withdrawn(sdp))
625 return error;
626 }
627 }
628
629 flush_workqueue(gfs2_delete_workqueue);
630 if (!log_write_allowed && current == sdp->sd_quotad_process)
631 fs_warn(sdp, "The quotad daemon is withdrawing.\n");
632 else if (sdp->sd_quotad_process)
633 kthread_stop(sdp->sd_quotad_process);
634 sdp->sd_quotad_process = NULL;
635
636 if (!log_write_allowed && current == sdp->sd_logd_process)
637 fs_warn(sdp, "The logd daemon is withdrawing.\n");
638 else if (sdp->sd_logd_process)
639 kthread_stop(sdp->sd_logd_process);
640 sdp->sd_logd_process = NULL;
641
642 if (log_write_allowed) {
643 gfs2_quota_sync(sdp->sd_vfs, 0);
644 gfs2_statfs_sync(sdp->sd_vfs, 0);
645
646 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
647 GFS2_LFC_MAKE_FS_RO);
648 wait_event(sdp->sd_reserving_log_wait,
649 atomic_read(&sdp->sd_reserving_log) == 0);
650 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) ==
651 sdp->sd_jdesc->jd_blocks);
652 } else {
653 wait_event_timeout(sdp->sd_reserving_log_wait,
654 atomic_read(&sdp->sd_reserving_log) == 0,
655 HZ * 5);
656 }
657 if (gfs2_holder_initialized(&freeze_gh))
658 gfs2_glock_dq_uninit(&freeze_gh);
659
660 gfs2_quota_cleanup(sdp);
661
662 if (!log_write_allowed)
663 sdp->sd_vfs->s_flags |= SB_RDONLY;
664
665 return error;
666 }
667
668 /**
669 * gfs2_put_super - Unmount the filesystem
670 * @sb: The VFS superblock
671 *
672 */
673
674 static void gfs2_put_super(struct super_block *sb)
675 {
676 struct gfs2_sbd *sdp = sb->s_fs_info;
677 int error;
678 struct gfs2_jdesc *jd;
679
680 /* No more recovery requests */
681 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
682 smp_mb();
683
684 /* Wait on outstanding recovery */
685 restart:
686 spin_lock(&sdp->sd_jindex_spin);
687 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
688 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
689 continue;
690 spin_unlock(&sdp->sd_jindex_spin);
691 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
692 TASK_UNINTERRUPTIBLE);
693 goto restart;
694 }
695 spin_unlock(&sdp->sd_jindex_spin);
696
697 if (!sb_rdonly(sb)) {
698 error = gfs2_make_fs_ro(sdp);
699 if (error)
700 gfs2_io_error(sdp);
701 }
702 /* At this point, we're through modifying the disk */
703
704 /* Release stuff */
705
706 iput(sdp->sd_jindex);
707 iput(sdp->sd_statfs_inode);
708 iput(sdp->sd_rindex);
709 iput(sdp->sd_quota_inode);
710
711 gfs2_glock_put(sdp->sd_rename_gl);
712 gfs2_glock_put(sdp->sd_freeze_gl);
713
714 if (!sdp->sd_args.ar_spectator) {
715 if (gfs2_holder_initialized(&sdp->sd_journal_gh))
716 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
717 if (gfs2_holder_initialized(&sdp->sd_jinode_gh))
718 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
719 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
720 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
721 iput(sdp->sd_sc_inode);
722 iput(sdp->sd_qc_inode);
723 }
724
725 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
726 gfs2_clear_rgrpd(sdp);
727 gfs2_jindex_free(sdp);
728 /* Take apart glock structures and buffer lists */
729 gfs2_gl_hash_clear(sdp);
730 gfs2_delete_debugfs_file(sdp);
731 /* Unmount the locking protocol */
732 gfs2_lm_unmount(sdp);
733
734 /* At this point, we're through participating in the lockspace */
735 gfs2_sys_fs_del(sdp);
736 }
737
738 /**
739 * gfs2_sync_fs - sync the filesystem
740 * @sb: the superblock
741 *
742 * Flushes the log to disk.
743 */
744
745 static int gfs2_sync_fs(struct super_block *sb, int wait)
746 {
747 struct gfs2_sbd *sdp = sb->s_fs_info;
748
749 gfs2_quota_sync(sb, -1);
750 if (wait)
751 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
752 GFS2_LFC_SYNC_FS);
753 return sdp->sd_log_error;
754 }
755
756 void gfs2_freeze_func(struct work_struct *work)
757 {
758 int error;
759 struct gfs2_holder freeze_gh;
760 struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
761 struct super_block *sb = sdp->sd_vfs;
762
763 atomic_inc(&sb->s_active);
764 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
765 &freeze_gh);
766 if (error) {
767 fs_info(sdp, "GFS2: couldn't get freeze lock : %d\n", error);
768 gfs2_assert_withdraw(sdp, 0);
769 } else {
770 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
771 error = thaw_super(sb);
772 if (error) {
773 fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n",
774 error);
775 gfs2_assert_withdraw(sdp, 0);
776 }
777 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
778 freeze_gh.gh_flags |= GL_NOCACHE;
779 gfs2_glock_dq_uninit(&freeze_gh);
780 }
781 deactivate_super(sb);
782 clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags);
783 wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN);
784 return;
785 }
786
787 /**
788 * gfs2_freeze - prevent further writes to the filesystem
789 * @sb: the VFS structure for the filesystem
790 *
791 */
792
793 static int gfs2_freeze(struct super_block *sb)
794 {
795 struct gfs2_sbd *sdp = sb->s_fs_info;
796 int error = 0;
797
798 mutex_lock(&sdp->sd_freeze_mutex);
799 if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
800 goto out;
801
802 for (;;) {
803 if (gfs2_withdrawn(sdp)) {
804 error = -EINVAL;
805 goto out;
806 }
807
808 error = gfs2_lock_fs_check_clean(sdp);
809 if (!error)
810 break;
811
812 if (error == -EBUSY)
813 fs_err(sdp, "waiting for recovery before freeze\n");
814 else if (error == -EIO) {
815 fs_err(sdp, "Fatal IO error: cannot freeze gfs2 due "
816 "to recovery error.\n");
817 goto out;
818 } else {
819 fs_err(sdp, "error freezing FS: %d\n", error);
820 }
821 fs_err(sdp, "retrying...\n");
822 msleep(1000);
823 }
824 set_bit(SDF_FS_FROZEN, &sdp->sd_flags);
825 out:
826 mutex_unlock(&sdp->sd_freeze_mutex);
827 return error;
828 }
829
830 /**
831 * gfs2_unfreeze - reallow writes to the filesystem
832 * @sb: the VFS structure for the filesystem
833 *
834 */
835
836 static int gfs2_unfreeze(struct super_block *sb)
837 {
838 struct gfs2_sbd *sdp = sb->s_fs_info;
839
840 mutex_lock(&sdp->sd_freeze_mutex);
841 if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
842 !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
843 mutex_unlock(&sdp->sd_freeze_mutex);
844 return 0;
845 }
846
847 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
848 mutex_unlock(&sdp->sd_freeze_mutex);
849 return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE);
850 }
851
852 /**
853 * statfs_fill - fill in the sg for a given RG
854 * @rgd: the RG
855 * @sc: the sc structure
856 *
857 * Returns: 0 on success, -ESTALE if the LVB is invalid
858 */
859
860 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
861 struct gfs2_statfs_change_host *sc)
862 {
863 gfs2_rgrp_verify(rgd);
864 sc->sc_total += rgd->rd_data;
865 sc->sc_free += rgd->rd_free;
866 sc->sc_dinodes += rgd->rd_dinodes;
867 return 0;
868 }
869
870 /**
871 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
872 * @sdp: the filesystem
873 * @sc: the sc info that will be returned
874 *
875 * Any error (other than a signal) will cause this routine to fall back
876 * to the synchronous version.
877 *
878 * FIXME: This really shouldn't busy wait like this.
879 *
880 * Returns: errno
881 */
882
883 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
884 {
885 struct gfs2_rgrpd *rgd_next;
886 struct gfs2_holder *gha, *gh;
887 unsigned int slots = 64;
888 unsigned int x;
889 int done;
890 int error = 0, err;
891
892 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
893 gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
894 if (!gha)
895 return -ENOMEM;
896 for (x = 0; x < slots; x++)
897 gfs2_holder_mark_uninitialized(gha + x);
898
899 rgd_next = gfs2_rgrpd_get_first(sdp);
900
901 for (;;) {
902 done = 1;
903
904 for (x = 0; x < slots; x++) {
905 gh = gha + x;
906
907 if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
908 err = gfs2_glock_wait(gh);
909 if (err) {
910 gfs2_holder_uninit(gh);
911 error = err;
912 } else {
913 if (!error) {
914 struct gfs2_rgrpd *rgd =
915 gfs2_glock2rgrp(gh->gh_gl);
916
917 error = statfs_slow_fill(rgd, sc);
918 }
919 gfs2_glock_dq_uninit(gh);
920 }
921 }
922
923 if (gfs2_holder_initialized(gh))
924 done = 0;
925 else if (rgd_next && !error) {
926 error = gfs2_glock_nq_init(rgd_next->rd_gl,
927 LM_ST_SHARED,
928 GL_ASYNC,
929 gh);
930 rgd_next = gfs2_rgrpd_get_next(rgd_next);
931 done = 0;
932 }
933
934 if (signal_pending(current))
935 error = -ERESTARTSYS;
936 }
937
938 if (done)
939 break;
940
941 yield();
942 }
943
944 kfree(gha);
945 return error;
946 }
947
948 /**
949 * gfs2_statfs_i - Do a statfs
950 * @sdp: the filesystem
951 * @sg: the sg structure
952 *
953 * Returns: errno
954 */
955
956 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
957 {
958 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
959 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
960
961 spin_lock(&sdp->sd_statfs_spin);
962
963 *sc = *m_sc;
964 sc->sc_total += l_sc->sc_total;
965 sc->sc_free += l_sc->sc_free;
966 sc->sc_dinodes += l_sc->sc_dinodes;
967
968 spin_unlock(&sdp->sd_statfs_spin);
969
970 if (sc->sc_free < 0)
971 sc->sc_free = 0;
972 if (sc->sc_free > sc->sc_total)
973 sc->sc_free = sc->sc_total;
974 if (sc->sc_dinodes < 0)
975 sc->sc_dinodes = 0;
976
977 return 0;
978 }
979
980 /**
981 * gfs2_statfs - Gather and return stats about the filesystem
982 * @sb: The superblock
983 * @statfsbuf: The buffer
984 *
985 * Returns: 0 on success or error code
986 */
987
988 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
989 {
990 struct super_block *sb = dentry->d_sb;
991 struct gfs2_sbd *sdp = sb->s_fs_info;
992 struct gfs2_statfs_change_host sc;
993 int error;
994
995 error = gfs2_rindex_update(sdp);
996 if (error)
997 return error;
998
999 if (gfs2_tune_get(sdp, gt_statfs_slow))
1000 error = gfs2_statfs_slow(sdp, &sc);
1001 else
1002 error = gfs2_statfs_i(sdp, &sc);
1003
1004 if (error)
1005 return error;
1006
1007 buf->f_type = GFS2_MAGIC;
1008 buf->f_bsize = sdp->sd_sb.sb_bsize;
1009 buf->f_blocks = sc.sc_total;
1010 buf->f_bfree = sc.sc_free;
1011 buf->f_bavail = sc.sc_free;
1012 buf->f_files = sc.sc_dinodes + sc.sc_free;
1013 buf->f_ffree = sc.sc_free;
1014 buf->f_namelen = GFS2_FNAMESIZE;
1015
1016 return 0;
1017 }
1018
1019 /**
1020 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1021 * @inode: The inode to drop
1022 *
1023 * If we've received a callback on an iopen lock then it's because a
1024 * remote node tried to deallocate the inode but failed due to this node
1025 * still having the inode open. Here we mark the link count zero
1026 * since we know that it must have reached zero if the GLF_DEMOTE flag
1027 * is set on the iopen glock. If we didn't do a disk read since the
1028 * remote node removed the final link then we might otherwise miss
1029 * this event. This check ensures that this node will deallocate the
1030 * inode's blocks, or alternatively pass the baton on to another
1031 * node for later deallocation.
1032 */
1033
1034 static int gfs2_drop_inode(struct inode *inode)
1035 {
1036 struct gfs2_inode *ip = GFS2_I(inode);
1037
1038 if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
1039 inode->i_nlink &&
1040 gfs2_holder_initialized(&ip->i_iopen_gh)) {
1041 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1042 if (test_bit(GLF_DEMOTE, &gl->gl_flags))
1043 clear_nlink(inode);
1044 }
1045
1046 /*
1047 * When under memory pressure when an inode's link count has dropped to
1048 * zero, defer deleting the inode to the delete workqueue. This avoids
1049 * calling into DLM under memory pressure, which can deadlock.
1050 */
1051 if (!inode->i_nlink &&
1052 unlikely(current->flags & PF_MEMALLOC) &&
1053 gfs2_holder_initialized(&ip->i_iopen_gh)) {
1054 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1055
1056 gfs2_glock_hold(gl);
1057 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
1058 gfs2_glock_queue_put(gl);
1059 return false;
1060 }
1061
1062 return generic_drop_inode(inode);
1063 }
1064
1065 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1066 {
1067 do {
1068 if (d1 == d2)
1069 return 1;
1070 d1 = d1->d_parent;
1071 } while (!IS_ROOT(d1));
1072 return 0;
1073 }
1074
1075 /**
1076 * gfs2_show_options - Show mount options for /proc/mounts
1077 * @s: seq_file structure
1078 * @root: root of this (sub)tree
1079 *
1080 * Returns: 0 on success or error code
1081 */
1082
1083 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1084 {
1085 struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1086 struct gfs2_args *args = &sdp->sd_args;
1087 int val;
1088
1089 if (is_ancestor(root, sdp->sd_master_dir))
1090 seq_puts(s, ",meta");
1091 if (args->ar_lockproto[0])
1092 seq_show_option(s, "lockproto", args->ar_lockproto);
1093 if (args->ar_locktable[0])
1094 seq_show_option(s, "locktable", args->ar_locktable);
1095 if (args->ar_hostdata[0])
1096 seq_show_option(s, "hostdata", args->ar_hostdata);
1097 if (args->ar_spectator)
1098 seq_puts(s, ",spectator");
1099 if (args->ar_localflocks)
1100 seq_puts(s, ",localflocks");
1101 if (args->ar_debug)
1102 seq_puts(s, ",debug");
1103 if (args->ar_posix_acl)
1104 seq_puts(s, ",acl");
1105 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1106 char *state;
1107 switch (args->ar_quota) {
1108 case GFS2_QUOTA_OFF:
1109 state = "off";
1110 break;
1111 case GFS2_QUOTA_ACCOUNT:
1112 state = "account";
1113 break;
1114 case GFS2_QUOTA_ON:
1115 state = "on";
1116 break;
1117 default:
1118 state = "unknown";
1119 break;
1120 }
1121 seq_printf(s, ",quota=%s", state);
1122 }
1123 if (args->ar_suiddir)
1124 seq_puts(s, ",suiddir");
1125 if (args->ar_data != GFS2_DATA_DEFAULT) {
1126 char *state;
1127 switch (args->ar_data) {
1128 case GFS2_DATA_WRITEBACK:
1129 state = "writeback";
1130 break;
1131 case GFS2_DATA_ORDERED:
1132 state = "ordered";
1133 break;
1134 default:
1135 state = "unknown";
1136 break;
1137 }
1138 seq_printf(s, ",data=%s", state);
1139 }
1140 if (args->ar_discard)
1141 seq_puts(s, ",discard");
1142 val = sdp->sd_tune.gt_logd_secs;
1143 if (val != 30)
1144 seq_printf(s, ",commit=%d", val);
1145 val = sdp->sd_tune.gt_statfs_quantum;
1146 if (val != 30)
1147 seq_printf(s, ",statfs_quantum=%d", val);
1148 else if (sdp->sd_tune.gt_statfs_slow)
1149 seq_puts(s, ",statfs_quantum=0");
1150 val = sdp->sd_tune.gt_quota_quantum;
1151 if (val != 60)
1152 seq_printf(s, ",quota_quantum=%d", val);
1153 if (args->ar_statfs_percent)
1154 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1155 if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1156 const char *state;
1157
1158 switch (args->ar_errors) {
1159 case GFS2_ERRORS_WITHDRAW:
1160 state = "withdraw";
1161 break;
1162 case GFS2_ERRORS_PANIC:
1163 state = "panic";
1164 break;
1165 default:
1166 state = "unknown";
1167 break;
1168 }
1169 seq_printf(s, ",errors=%s", state);
1170 }
1171 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1172 seq_puts(s, ",nobarrier");
1173 if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1174 seq_puts(s, ",demote_interface_used");
1175 if (args->ar_rgrplvb)
1176 seq_puts(s, ",rgrplvb");
1177 if (args->ar_loccookie)
1178 seq_puts(s, ",loccookie");
1179 return 0;
1180 }
1181
1182 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1183 {
1184 struct inode *inode = &ip->i_inode;
1185 struct gfs2_glock *gl = ip->i_gl;
1186
1187 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1188 truncate_inode_pages(&inode->i_data, 0);
1189
1190 if (atomic_read(&gl->gl_revokes) == 0) {
1191 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1192 clear_bit(GLF_DIRTY, &gl->gl_flags);
1193 }
1194 }
1195
1196 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1197 {
1198 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1199 struct gfs2_rgrpd *rgd;
1200 struct gfs2_holder gh;
1201 int error;
1202
1203 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1204 gfs2_consist_inode(ip);
1205 return -EIO;
1206 }
1207
1208 error = gfs2_rindex_update(sdp);
1209 if (error)
1210 return error;
1211
1212 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1213 if (error)
1214 return error;
1215
1216 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1217 if (!rgd) {
1218 gfs2_consist_inode(ip);
1219 error = -EIO;
1220 goto out_qs;
1221 }
1222
1223 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1224 if (error)
1225 goto out_qs;
1226
1227 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1228 sdp->sd_jdesc->jd_blocks);
1229 if (error)
1230 goto out_rg_gunlock;
1231
1232 gfs2_free_di(rgd, ip);
1233
1234 gfs2_final_release_pages(ip);
1235
1236 gfs2_trans_end(sdp);
1237
1238 out_rg_gunlock:
1239 gfs2_glock_dq_uninit(&gh);
1240 out_qs:
1241 gfs2_quota_unhold(ip);
1242 return error;
1243 }
1244
1245 /**
1246 * gfs2_glock_put_eventually
1247 * @gl: The glock to put
1248 *
1249 * When under memory pressure, trigger a deferred glock put to make sure we
1250 * won't call into DLM and deadlock. Otherwise, put the glock directly.
1251 */
1252
1253 static void gfs2_glock_put_eventually(struct gfs2_glock *gl)
1254 {
1255 if (current->flags & PF_MEMALLOC)
1256 gfs2_glock_queue_put(gl);
1257 else
1258 gfs2_glock_put(gl);
1259 }
1260
1261 /**
1262 * gfs2_evict_inode - Remove an inode from cache
1263 * @inode: The inode to evict
1264 *
1265 * There are three cases to consider:
1266 * 1. i_nlink == 0, we are final opener (and must deallocate)
1267 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1268 * 3. i_nlink > 0
1269 *
1270 * If the fs is read only, then we have to treat all cases as per #3
1271 * since we are unable to do any deallocation. The inode will be
1272 * deallocated by the next read/write node to attempt an allocation
1273 * in the same resource group
1274 *
1275 * We have to (at the moment) hold the inodes main lock to cover
1276 * the gap between unlocking the shared lock on the iopen lock and
1277 * taking the exclusive lock. I'd rather do a shared -> exclusive
1278 * conversion on the iopen lock, but we can change that later. This
1279 * is safe, just less efficient.
1280 */
1281
1282 static void gfs2_evict_inode(struct inode *inode)
1283 {
1284 struct super_block *sb = inode->i_sb;
1285 struct gfs2_sbd *sdp = sb->s_fs_info;
1286 struct gfs2_inode *ip = GFS2_I(inode);
1287 struct gfs2_holder gh;
1288 struct address_space *metamapping;
1289 int error;
1290
1291 if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1292 clear_inode(inode);
1293 return;
1294 }
1295
1296 if (inode->i_nlink || sb_rdonly(sb))
1297 goto out;
1298
1299 if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1300 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
1301 gfs2_holder_mark_uninitialized(&gh);
1302 goto alloc_failed;
1303 }
1304
1305 /* Deletes should never happen under memory pressure anymore. */
1306 if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
1307 goto out;
1308
1309 /* Must not read inode block until block type has been verified */
1310 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1311 if (unlikely(error)) {
1312 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1313 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1314 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1315 goto out;
1316 }
1317
1318 error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1319 if (error)
1320 goto out_truncate;
1321
1322 if (test_bit(GIF_INVALID, &ip->i_flags)) {
1323 error = gfs2_inode_refresh(ip);
1324 if (error)
1325 goto out_truncate;
1326 }
1327
1328 /*
1329 * The inode may have been recreated in the meantime.
1330 */
1331 if (inode->i_nlink)
1332 goto out_truncate;
1333
1334 alloc_failed:
1335 if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
1336 test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1337 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1338 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1339 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE,
1340 &ip->i_iopen_gh);
1341 error = gfs2_glock_nq(&ip->i_iopen_gh);
1342 if (error)
1343 goto out_truncate;
1344 }
1345
1346 if (S_ISDIR(inode->i_mode) &&
1347 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1348 error = gfs2_dir_exhash_dealloc(ip);
1349 if (error)
1350 goto out_unlock;
1351 }
1352
1353 if (ip->i_eattr) {
1354 error = gfs2_ea_dealloc(ip);
1355 if (error)
1356 goto out_unlock;
1357 }
1358
1359 if (!gfs2_is_stuffed(ip)) {
1360 error = gfs2_file_dealloc(ip);
1361 if (error)
1362 goto out_unlock;
1363 }
1364
1365 /* We're about to clear the bitmap for the dinode, but as soon as we
1366 do, gfs2_create_inode can create another inode at the same block
1367 location and try to set gl_object again. We clear gl_object here so
1368 that subsequent inode creates don't see an old gl_object. */
1369 glock_clear_object(ip->i_gl, ip);
1370 error = gfs2_dinode_dealloc(ip);
1371 goto out_unlock;
1372
1373 out_truncate:
1374 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
1375 GFS2_LFC_EVICT_INODE);
1376 metamapping = gfs2_glock2aspace(ip->i_gl);
1377 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1378 filemap_fdatawrite(metamapping);
1379 filemap_fdatawait(metamapping);
1380 }
1381 write_inode_now(inode, 1);
1382 gfs2_ail_flush(ip->i_gl, 0);
1383
1384 error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1385 if (error)
1386 goto out_unlock;
1387 /* Needs to be done before glock release & also in a transaction */
1388 truncate_inode_pages(&inode->i_data, 0);
1389 truncate_inode_pages(metamapping, 0);
1390 gfs2_trans_end(sdp);
1391
1392 out_unlock:
1393 if (gfs2_rs_active(&ip->i_res))
1394 gfs2_rs_deltree(&ip->i_res);
1395
1396 if (gfs2_holder_initialized(&gh)) {
1397 glock_clear_object(ip->i_gl, ip);
1398 gfs2_glock_dq_uninit(&gh);
1399 }
1400 if (error && error != GLR_TRYFAILED && error != -EROFS)
1401 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1402 out:
1403 truncate_inode_pages_final(&inode->i_data);
1404 if (ip->i_qadata)
1405 gfs2_assert_warn(sdp, ip->i_qadata->qa_ref == 0);
1406 gfs2_rs_delete(ip, NULL);
1407 gfs2_ordered_del_inode(ip);
1408 clear_inode(inode);
1409 gfs2_dir_hash_inval(ip);
1410 if (ip->i_gl) {
1411 glock_clear_object(ip->i_gl, ip);
1412 wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
1413 gfs2_glock_add_to_lru(ip->i_gl);
1414 gfs2_glock_put_eventually(ip->i_gl);
1415 ip->i_gl = NULL;
1416 }
1417 if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1418 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1419
1420 glock_clear_object(gl, ip);
1421 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1422 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1423 gfs2_glock_dq(&ip->i_iopen_gh);
1424 }
1425 gfs2_glock_hold(gl);
1426 gfs2_holder_uninit(&ip->i_iopen_gh);
1427 gfs2_glock_put_eventually(gl);
1428 }
1429 }
1430
1431 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1432 {
1433 struct gfs2_inode *ip;
1434
1435 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1436 if (!ip)
1437 return NULL;
1438 ip->i_flags = 0;
1439 ip->i_gl = NULL;
1440 gfs2_holder_mark_uninitialized(&ip->i_iopen_gh);
1441 memset(&ip->i_res, 0, sizeof(ip->i_res));
1442 RB_CLEAR_NODE(&ip->i_res.rs_node);
1443 ip->i_rahead = 0;
1444 return &ip->i_inode;
1445 }
1446
1447 static void gfs2_free_inode(struct inode *inode)
1448 {
1449 kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode));
1450 }
1451
1452 const struct super_operations gfs2_super_ops = {
1453 .alloc_inode = gfs2_alloc_inode,
1454 .free_inode = gfs2_free_inode,
1455 .write_inode = gfs2_write_inode,
1456 .dirty_inode = gfs2_dirty_inode,
1457 .evict_inode = gfs2_evict_inode,
1458 .put_super = gfs2_put_super,
1459 .sync_fs = gfs2_sync_fs,
1460 .freeze_super = gfs2_freeze,
1461 .thaw_super = gfs2_unfreeze,
1462 .statfs = gfs2_statfs,
1463 .drop_inode = gfs2_drop_inode,
1464 .show_options = gfs2_show_options,
1465 };
1466
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