?  search:
summary | log | graphiclog1 | graphiclog2 | commit | commitdiff | tree | refs | edit | fork
blame | history | raw | HEAD
io_uring: ensure finish_wait() is always called in __io_uring_task_cancel()
[linux/fpc-iii.git] / fs / gfs2 / super.c
blob2f56acc41c0498184ea367085267e95b7c234611
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 enum dinode_demise {
48 SHOULD_DELETE_DINODE,
49 SHOULD_NOT_DELETE_DINODE,
50 SHOULD_DEFER_EVICTION,
51 };
52
53 /**
54 * gfs2_jindex_free - Clear all the journal index information
55 * @sdp: The GFS2 superblock
56 *
57 */
58
59 void gfs2_jindex_free(struct gfs2_sbd *sdp)
60 {
61 struct list_head list;
62 struct gfs2_jdesc *jd;
63
64 spin_lock(&sdp->sd_jindex_spin);
65 list_add(&list, &sdp->sd_jindex_list);
66 list_del_init(&sdp->sd_jindex_list);
67 sdp->sd_journals = 0;
68 spin_unlock(&sdp->sd_jindex_spin);
69
70 sdp->sd_jdesc = NULL;
71 while (!list_empty(&list)) {
72 jd = list_first_entry(&list, struct gfs2_jdesc, jd_list);
73 gfs2_free_journal_extents(jd);
74 list_del(&jd->jd_list);
75 iput(jd->jd_inode);
76 jd->jd_inode = NULL;
77 kfree(jd);
78 }
79 }
80
81 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
82 {
83 struct gfs2_jdesc *jd;
84 int found = 0;
85
86 list_for_each_entry(jd, head, jd_list) {
87 if (jd->jd_jid == jid) {
88 found = 1;
89 break;
90 }
91 }
92
93 if (!found)
94 jd = NULL;
95
96 return jd;
97 }
98
99 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
100 {
101 struct gfs2_jdesc *jd;
102
103 spin_lock(&sdp->sd_jindex_spin);
104 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
105 spin_unlock(&sdp->sd_jindex_spin);
106
107 return jd;
108 }
109
110 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
111 {
112 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
113 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
114 u64 size = i_size_read(jd->jd_inode);
115
116 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30)))
117 return -EIO;
118
119 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
120
121 if (gfs2_write_alloc_required(ip, 0, size)) {
122 gfs2_consist_inode(ip);
123 return -EIO;
124 }
125
126 return 0;
127 }
128
129 static int init_threads(struct gfs2_sbd *sdp)
130 {
131 struct task_struct *p;
132 int error = 0;
133
134 p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
135 if (IS_ERR(p)) {
136 error = PTR_ERR(p);
137 fs_err(sdp, "can't start logd thread: %d\n", error);
138 return error;
139 }
140 sdp->sd_logd_process = p;
141
142 p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
143 if (IS_ERR(p)) {
144 error = PTR_ERR(p);
145 fs_err(sdp, "can't start quotad thread: %d\n", error);
146 goto fail;
147 }
148 sdp->sd_quotad_process = p;
149 return 0;
150
151 fail:
152 kthread_stop(sdp->sd_logd_process);
153 sdp->sd_logd_process = NULL;
154 return error;
155 }
156
157 /**
158 * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
159 * @sdp: the filesystem
160 *
161 * Returns: errno
162 */
163
164 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
165 {
166 struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
167 struct gfs2_glock *j_gl = ip->i_gl;
168 struct gfs2_holder freeze_gh;
169 struct gfs2_log_header_host head;
170 int error;
171
172 error = init_threads(sdp);
173 if (error)
174 return error;
175
176 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED,
177 LM_FLAG_NOEXP | GL_EXACT,
178 &freeze_gh);
179 if (error)
180 goto fail_threads;
181
182 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
183 if (gfs2_withdrawn(sdp)) {
184 error = -EIO;
185 goto fail;
186 }
187
188 error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
189 if (error || gfs2_withdrawn(sdp))
190 goto fail;
191
192 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
193 gfs2_consist(sdp);
194 error = -EIO;
195 goto fail;
196 }
197
198 /* Initialize some head of the log stuff */
199 sdp->sd_log_sequence = head.lh_sequence + 1;
200 gfs2_log_pointers_init(sdp, head.lh_blkno);
201
202 error = gfs2_quota_init(sdp);
203 if (error || gfs2_withdrawn(sdp))
204 goto fail;
205
206 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
207
208 gfs2_glock_dq_uninit(&freeze_gh);
209
210 return 0;
211
212 fail:
213 gfs2_glock_dq_uninit(&freeze_gh);
214 fail_threads:
215 if (sdp->sd_quotad_process)
216 kthread_stop(sdp->sd_quotad_process);
217 sdp->sd_quotad_process = NULL;
218 if (sdp->sd_logd_process)
219 kthread_stop(sdp->sd_logd_process);
220 sdp->sd_logd_process = NULL;
221 return error;
222 }
223
224 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
225 {
226 const struct gfs2_statfs_change *str = buf;
227
228 sc->sc_total = be64_to_cpu(str->sc_total);
229 sc->sc_free = be64_to_cpu(str->sc_free);
230 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
231 }
232
233 void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
234 {
235 struct gfs2_statfs_change *str = buf;
236
237 str->sc_total = cpu_to_be64(sc->sc_total);
238 str->sc_free = cpu_to_be64(sc->sc_free);
239 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
240 }
241
242 int gfs2_statfs_init(struct gfs2_sbd *sdp)
243 {
244 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
245 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
246 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
247 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
248 struct buffer_head *m_bh, *l_bh;
249 struct gfs2_holder gh;
250 int error;
251
252 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
253 &gh);
254 if (error)
255 return error;
256
257 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
258 if (error)
259 goto out;
260
261 if (sdp->sd_args.ar_spectator) {
262 spin_lock(&sdp->sd_statfs_spin);
263 gfs2_statfs_change_in(m_sc, m_bh->b_data +
264 sizeof(struct gfs2_dinode));
265 spin_unlock(&sdp->sd_statfs_spin);
266 } else {
267 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
268 if (error)
269 goto out_m_bh;
270
271 spin_lock(&sdp->sd_statfs_spin);
272 gfs2_statfs_change_in(m_sc, m_bh->b_data +
273 sizeof(struct gfs2_dinode));
274 gfs2_statfs_change_in(l_sc, l_bh->b_data +
275 sizeof(struct gfs2_dinode));
276 spin_unlock(&sdp->sd_statfs_spin);
277
278 brelse(l_bh);
279 }
280
281 out_m_bh:
282 brelse(m_bh);
283 out:
284 gfs2_glock_dq_uninit(&gh);
285 return 0;
286 }
287
288 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
289 s64 dinodes)
290 {
291 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
292 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
293 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
294 struct buffer_head *l_bh;
295 s64 x, y;
296 int need_sync = 0;
297 int error;
298
299 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
300 if (error)
301 return;
302
303 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
304
305 spin_lock(&sdp->sd_statfs_spin);
306 l_sc->sc_total += total;
307 l_sc->sc_free += free;
308 l_sc->sc_dinodes += dinodes;
309 gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
310 if (sdp->sd_args.ar_statfs_percent) {
311 x = 100 * l_sc->sc_free;
312 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
313 if (x >= y || x <= -y)
314 need_sync = 1;
315 }
316 spin_unlock(&sdp->sd_statfs_spin);
317
318 brelse(l_bh);
319 if (need_sync)
320 gfs2_wake_up_statfs(sdp);
321 }
322
323 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
324 struct buffer_head *l_bh)
325 {
326 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
327 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
328 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
329 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
330
331 gfs2_trans_add_meta(l_ip->i_gl, l_bh);
332 gfs2_trans_add_meta(m_ip->i_gl, m_bh);
333
334 spin_lock(&sdp->sd_statfs_spin);
335 m_sc->sc_total += l_sc->sc_total;
336 m_sc->sc_free += l_sc->sc_free;
337 m_sc->sc_dinodes += l_sc->sc_dinodes;
338 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
339 memset(l_bh->b_data + sizeof(struct gfs2_dinode),
340 0, sizeof(struct gfs2_statfs_change));
341 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
342 spin_unlock(&sdp->sd_statfs_spin);
343 }
344
345 int gfs2_statfs_sync(struct super_block *sb, int type)
346 {
347 struct gfs2_sbd *sdp = sb->s_fs_info;
348 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
349 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
350 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
351 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
352 struct gfs2_holder gh;
353 struct buffer_head *m_bh, *l_bh;
354 int error;
355
356 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
357 &gh);
358 if (error)
359 goto out;
360
361 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
362 if (error)
363 goto out_unlock;
364
365 spin_lock(&sdp->sd_statfs_spin);
366 gfs2_statfs_change_in(m_sc, m_bh->b_data +
367 sizeof(struct gfs2_dinode));
368 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
369 spin_unlock(&sdp->sd_statfs_spin);
370 goto out_bh;
371 }
372 spin_unlock(&sdp->sd_statfs_spin);
373
374 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
375 if (error)
376 goto out_bh;
377
378 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
379 if (error)
380 goto out_bh2;
381
382 update_statfs(sdp, m_bh, l_bh);
383 sdp->sd_statfs_force_sync = 0;
384
385 gfs2_trans_end(sdp);
386
387 out_bh2:
388 brelse(l_bh);
389 out_bh:
390 brelse(m_bh);
391 out_unlock:
392 gfs2_glock_dq_uninit(&gh);
393 out:
394 return error;
395 }
396
397 struct lfcc {
398 struct list_head list;
399 struct gfs2_holder gh;
400 };
401
402 /**
403 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
404 * journals are clean
405 * @sdp: the file system
406 * @state: the state to put the transaction lock into
407 * @t_gh: the hold on the transaction lock
408 *
409 * Returns: errno
410 */
411
412 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp)
413 {
414 struct gfs2_inode *ip;
415 struct gfs2_jdesc *jd;
416 struct lfcc *lfcc;
417 LIST_HEAD(list);
418 struct gfs2_log_header_host lh;
419 int error;
420
421 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
422 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
423 if (!lfcc) {
424 error = -ENOMEM;
425 goto out;
426 }
427 ip = GFS2_I(jd->jd_inode);
428 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
429 if (error) {
430 kfree(lfcc);
431 goto out;
432 }
433 list_add(&lfcc->list, &list);
434 }
435
436 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
437 LM_FLAG_NOEXP, &sdp->sd_freeze_gh);
438 if (error)
439 goto out;
440
441 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
442 error = gfs2_jdesc_check(jd);
443 if (error)
444 break;
445 error = gfs2_find_jhead(jd, &lh, false);
446 if (error)
447 break;
448 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
449 error = -EBUSY;
450 break;
451 }
452 }
453
454 if (error)
455 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
456
457 out:
458 while (!list_empty(&list)) {
459 lfcc = list_first_entry(&list, struct lfcc, list);
460 list_del(&lfcc->list);
461 gfs2_glock_dq_uninit(&lfcc->gh);
462 kfree(lfcc);
463 }
464 return error;
465 }
466
467 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
468 {
469 struct gfs2_dinode *str = buf;
470
471 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
472 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
473 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
474 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
475 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
476 str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
477 str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
478 str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
479 str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
480 str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
481 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
482 str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
483 str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
484 str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
485
486 str->di_goal_meta = cpu_to_be64(ip->i_goal);
487 str->di_goal_data = cpu_to_be64(ip->i_goal);
488 str->di_generation = cpu_to_be64(ip->i_generation);
489
490 str->di_flags = cpu_to_be32(ip->i_diskflags);
491 str->di_height = cpu_to_be16(ip->i_height);
492 str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
493 !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
494 GFS2_FORMAT_DE : 0);
495 str->di_depth = cpu_to_be16(ip->i_depth);
496 str->di_entries = cpu_to_be32(ip->i_entries);
497
498 str->di_eattr = cpu_to_be64(ip->i_eattr);
499 str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
500 str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
501 str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
502 }
503
504 /**
505 * gfs2_write_inode - Make sure the inode is stable on the disk
506 * @inode: The inode
507 * @wbc: The writeback control structure
508 *
509 * Returns: errno
510 */
511
512 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
513 {
514 struct gfs2_inode *ip = GFS2_I(inode);
515 struct gfs2_sbd *sdp = GFS2_SB(inode);
516 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
517 struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
518 int ret = 0;
519 bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
520
521 if (flush_all)
522 gfs2_log_flush(GFS2_SB(inode), ip->i_gl,
523 GFS2_LOG_HEAD_FLUSH_NORMAL |
524 GFS2_LFC_WRITE_INODE);
525 if (bdi->wb.dirty_exceeded)
526 gfs2_ail1_flush(sdp, wbc);
527 else
528 filemap_fdatawrite(metamapping);
529 if (flush_all)
530 ret = filemap_fdatawait(metamapping);
531 if (ret)
532 mark_inode_dirty_sync(inode);
533 else {
534 spin_lock(&inode->i_lock);
535 if (!(inode->i_flags & I_DIRTY))
536 gfs2_ordered_del_inode(ip);
537 spin_unlock(&inode->i_lock);
538 }
539 return ret;
540 }
541
542 /**
543 * gfs2_dirty_inode - check for atime updates
544 * @inode: The inode in question
545 * @flags: The type of dirty
546 *
547 * Unfortunately it can be called under any combination of inode
548 * glock and transaction lock, so we have to check carefully.
549 *
550 * At the moment this deals only with atime - it should be possible
551 * to expand that role in future, once a review of the locking has
552 * been carried out.
553 */
554
555 static void gfs2_dirty_inode(struct inode *inode, int flags)
556 {
557 struct gfs2_inode *ip = GFS2_I(inode);
558 struct gfs2_sbd *sdp = GFS2_SB(inode);
559 struct buffer_head *bh;
560 struct gfs2_holder gh;
561 int need_unlock = 0;
562 int need_endtrans = 0;
563 int ret;
564
565 if (!(flags & I_DIRTY_INODE))
566 return;
567 if (unlikely(gfs2_withdrawn(sdp)))
568 return;
569 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
570 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
571 if (ret) {
572 fs_err(sdp, "dirty_inode: glock %d\n", ret);
573 gfs2_dump_glock(NULL, ip->i_gl, true);
574 return;
575 }
576 need_unlock = 1;
577 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
578 return;
579
580 if (current->journal_info == NULL) {
581 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
582 if (ret) {
583 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
584 goto out;
585 }
586 need_endtrans = 1;
587 }
588
589 ret = gfs2_meta_inode_buffer(ip, &bh);
590 if (ret == 0) {
591 gfs2_trans_add_meta(ip->i_gl, bh);
592 gfs2_dinode_out(ip, bh->b_data);
593 brelse(bh);
594 }
595
596 if (need_endtrans)
597 gfs2_trans_end(sdp);
598 out:
599 if (need_unlock)
600 gfs2_glock_dq_uninit(&gh);
601 }
602
603 /**
604 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
605 * @sdp: the filesystem
606 *
607 * Returns: errno
608 */
609
610 int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
611 {
612 struct gfs2_holder freeze_gh;
613 int error = 0;
614 int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
615
616 gfs2_holder_mark_uninitialized(&freeze_gh);
617 if (sdp->sd_freeze_gl &&
618 !gfs2_glock_is_locked_by_me(sdp->sd_freeze_gl)) {
619 if (!log_write_allowed) {
620 error = gfs2_glock_nq_init(sdp->sd_freeze_gl,
621 LM_ST_SHARED, LM_FLAG_TRY |
622 LM_FLAG_NOEXP | GL_EXACT,
623 &freeze_gh);
624 if (error == GLR_TRYFAILED)
625 error = 0;
626 } else {
627 error = gfs2_glock_nq_init(sdp->sd_freeze_gl,
628 LM_ST_SHARED,
629 LM_FLAG_NOEXP | GL_EXACT,
630 &freeze_gh);
631 if (error && !gfs2_withdrawn(sdp))
632 return error;
633 }
634 }
635
636 gfs2_flush_delete_work(sdp);
637 if (!log_write_allowed && current == sdp->sd_quotad_process)
638 fs_warn(sdp, "The quotad daemon is withdrawing.\n");
639 else if (sdp->sd_quotad_process)
640 kthread_stop(sdp->sd_quotad_process);
641 sdp->sd_quotad_process = NULL;
642
643 if (!log_write_allowed && current == sdp->sd_logd_process)
644 fs_warn(sdp, "The logd daemon is withdrawing.\n");
645 else if (sdp->sd_logd_process)
646 kthread_stop(sdp->sd_logd_process);
647 sdp->sd_logd_process = NULL;
648
649 if (log_write_allowed) {
650 gfs2_quota_sync(sdp->sd_vfs, 0);
651 gfs2_statfs_sync(sdp->sd_vfs, 0);
652
653 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
654 GFS2_LFC_MAKE_FS_RO);
655 wait_event(sdp->sd_reserving_log_wait,
656 atomic_read(&sdp->sd_reserving_log) == 0);
657 gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) ==
658 sdp->sd_jdesc->jd_blocks);
659 } else {
660 wait_event_timeout(sdp->sd_reserving_log_wait,
661 atomic_read(&sdp->sd_reserving_log) == 0,
662 HZ * 5);
663 }
664 if (gfs2_holder_initialized(&freeze_gh))
665 gfs2_glock_dq_uninit(&freeze_gh);
666
667 gfs2_quota_cleanup(sdp);
668
669 if (!log_write_allowed)
670 sdp->sd_vfs->s_flags |= SB_RDONLY;
671
672 return error;
673 }
674
675 /**
676 * gfs2_put_super - Unmount the filesystem
677 * @sb: The VFS superblock
678 *
679 */
680
681 static void gfs2_put_super(struct super_block *sb)
682 {
683 struct gfs2_sbd *sdp = sb->s_fs_info;
684 int error;
685 struct gfs2_jdesc *jd;
686
687 /* No more recovery requests */
688 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
689 smp_mb();
690
691 /* Wait on outstanding recovery */
692 restart:
693 spin_lock(&sdp->sd_jindex_spin);
694 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
695 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
696 continue;
697 spin_unlock(&sdp->sd_jindex_spin);
698 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
699 TASK_UNINTERRUPTIBLE);
700 goto restart;
701 }
702 spin_unlock(&sdp->sd_jindex_spin);
703
704 if (!sb_rdonly(sb)) {
705 error = gfs2_make_fs_ro(sdp);
706 if (error)
707 gfs2_io_error(sdp);
708 }
709 WARN_ON(gfs2_withdrawing(sdp));
710
711 /* At this point, we're through modifying the disk */
712
713 /* Release stuff */
714
715 iput(sdp->sd_jindex);
716 iput(sdp->sd_statfs_inode);
717 iput(sdp->sd_rindex);
718 iput(sdp->sd_quota_inode);
719
720 gfs2_glock_put(sdp->sd_rename_gl);
721 gfs2_glock_put(sdp->sd_freeze_gl);
722
723 if (!sdp->sd_args.ar_spectator) {
724 if (gfs2_holder_initialized(&sdp->sd_journal_gh))
725 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
726 if (gfs2_holder_initialized(&sdp->sd_jinode_gh))
727 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
728 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
729 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
730 free_local_statfs_inodes(sdp);
731 iput(sdp->sd_qc_inode);
732 }
733
734 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
735 gfs2_clear_rgrpd(sdp);
736 gfs2_jindex_free(sdp);
737 /* Take apart glock structures and buffer lists */
738 gfs2_gl_hash_clear(sdp);
739 truncate_inode_pages_final(&sdp->sd_aspace);
740 gfs2_delete_debugfs_file(sdp);
741 /* Unmount the locking protocol */
742 gfs2_lm_unmount(sdp);
743
744 /* At this point, we're through participating in the lockspace */
745 gfs2_sys_fs_del(sdp);
746 free_sbd(sdp);
747 }
748
749 /**
750 * gfs2_sync_fs - sync the filesystem
751 * @sb: the superblock
752 *
753 * Flushes the log to disk.
754 */
755
756 static int gfs2_sync_fs(struct super_block *sb, int wait)
757 {
758 struct gfs2_sbd *sdp = sb->s_fs_info;
759
760 gfs2_quota_sync(sb, -1);
761 if (wait)
762 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
763 GFS2_LFC_SYNC_FS);
764 return sdp->sd_log_error;
765 }
766
767 void gfs2_freeze_func(struct work_struct *work)
768 {
769 int error;
770 struct gfs2_holder freeze_gh;
771 struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
772 struct super_block *sb = sdp->sd_vfs;
773
774 atomic_inc(&sb->s_active);
775 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED,
776 LM_FLAG_NOEXP | GL_EXACT, &freeze_gh);
777 if (error) {
778 fs_info(sdp, "GFS2: couldn't get freeze lock : %d\n", error);
779 gfs2_assert_withdraw(sdp, 0);
780 } else {
781 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
782 error = thaw_super(sb);
783 if (error) {
784 fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n",
785 error);
786 gfs2_assert_withdraw(sdp, 0);
787 }
788 gfs2_glock_dq_uninit(&freeze_gh);
789 }
790 deactivate_super(sb);
791 clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags);
792 wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN);
793 return;
794 }
795
796 /**
797 * gfs2_freeze - prevent further writes to the filesystem
798 * @sb: the VFS structure for the filesystem
799 *
800 */
801
802 static int gfs2_freeze(struct super_block *sb)
803 {
804 struct gfs2_sbd *sdp = sb->s_fs_info;
805 int error = 0;
806
807 mutex_lock(&sdp->sd_freeze_mutex);
808 if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
809 goto out;
810
811 for (;;) {
812 if (gfs2_withdrawn(sdp)) {
813 error = -EINVAL;
814 goto out;
815 }
816
817 error = gfs2_lock_fs_check_clean(sdp);
818 if (!error)
819 break;
820
821 if (error == -EBUSY)
822 fs_err(sdp, "waiting for recovery before freeze\n");
823 else if (error == -EIO) {
824 fs_err(sdp, "Fatal IO error: cannot freeze gfs2 due "
825 "to recovery error.\n");
826 goto out;
827 } else {
828 fs_err(sdp, "error freezing FS: %d\n", error);
829 }
830 fs_err(sdp, "retrying...\n");
831 msleep(1000);
832 }
833 set_bit(SDF_FS_FROZEN, &sdp->sd_flags);
834 out:
835 mutex_unlock(&sdp->sd_freeze_mutex);
836 return error;
837 }
838
839 /**
840 * gfs2_unfreeze - reallow writes to the filesystem
841 * @sb: the VFS structure for the filesystem
842 *
843 */
844
845 static int gfs2_unfreeze(struct super_block *sb)
846 {
847 struct gfs2_sbd *sdp = sb->s_fs_info;
848
849 mutex_lock(&sdp->sd_freeze_mutex);
850 if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
851 !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
852 mutex_unlock(&sdp->sd_freeze_mutex);
853 return 0;
854 }
855
856 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
857 mutex_unlock(&sdp->sd_freeze_mutex);
858 return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE);
859 }
860
861 /**
862 * statfs_fill - fill in the sg for a given RG
863 * @rgd: the RG
864 * @sc: the sc structure
865 *
866 * Returns: 0 on success, -ESTALE if the LVB is invalid
867 */
868
869 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
870 struct gfs2_statfs_change_host *sc)
871 {
872 gfs2_rgrp_verify(rgd);
873 sc->sc_total += rgd->rd_data;
874 sc->sc_free += rgd->rd_free;
875 sc->sc_dinodes += rgd->rd_dinodes;
876 return 0;
877 }
878
879 /**
880 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
881 * @sdp: the filesystem
882 * @sc: the sc info that will be returned
883 *
884 * Any error (other than a signal) will cause this routine to fall back
885 * to the synchronous version.
886 *
887 * FIXME: This really shouldn't busy wait like this.
888 *
889 * Returns: errno
890 */
891
892 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
893 {
894 struct gfs2_rgrpd *rgd_next;
895 struct gfs2_holder *gha, *gh;
896 unsigned int slots = 64;
897 unsigned int x;
898 int done;
899 int error = 0, err;
900
901 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
902 gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
903 if (!gha)
904 return -ENOMEM;
905 for (x = 0; x < slots; x++)
906 gfs2_holder_mark_uninitialized(gha + x);
907
908 rgd_next = gfs2_rgrpd_get_first(sdp);
909
910 for (;;) {
911 done = 1;
912
913 for (x = 0; x < slots; x++) {
914 gh = gha + x;
915
916 if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
917 err = gfs2_glock_wait(gh);
918 if (err) {
919 gfs2_holder_uninit(gh);
920 error = err;
921 } else {
922 if (!error) {
923 struct gfs2_rgrpd *rgd =
924 gfs2_glock2rgrp(gh->gh_gl);
925
926 error = statfs_slow_fill(rgd, sc);
927 }
928 gfs2_glock_dq_uninit(gh);
929 }
930 }
931
932 if (gfs2_holder_initialized(gh))
933 done = 0;
934 else if (rgd_next && !error) {
935 error = gfs2_glock_nq_init(rgd_next->rd_gl,
936 LM_ST_SHARED,
937 GL_ASYNC,
938 gh);
939 rgd_next = gfs2_rgrpd_get_next(rgd_next);
940 done = 0;
941 }
942
943 if (signal_pending(current))
944 error = -ERESTARTSYS;
945 }
946
947 if (done)
948 break;
949
950 yield();
951 }
952
953 kfree(gha);
954 return error;
955 }
956
957 /**
958 * gfs2_statfs_i - Do a statfs
959 * @sdp: the filesystem
960 * @sg: the sg structure
961 *
962 * Returns: errno
963 */
964
965 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
966 {
967 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
968 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
969
970 spin_lock(&sdp->sd_statfs_spin);
971
972 *sc = *m_sc;
973 sc->sc_total += l_sc->sc_total;
974 sc->sc_free += l_sc->sc_free;
975 sc->sc_dinodes += l_sc->sc_dinodes;
976
977 spin_unlock(&sdp->sd_statfs_spin);
978
979 if (sc->sc_free < 0)
980 sc->sc_free = 0;
981 if (sc->sc_free > sc->sc_total)
982 sc->sc_free = sc->sc_total;
983 if (sc->sc_dinodes < 0)
984 sc->sc_dinodes = 0;
985
986 return 0;
987 }
988
989 /**
990 * gfs2_statfs - Gather and return stats about the filesystem
991 * @sb: The superblock
992 * @statfsbuf: The buffer
993 *
994 * Returns: 0 on success or error code
995 */
996
997 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
998 {
999 struct super_block *sb = dentry->d_sb;
1000 struct gfs2_sbd *sdp = sb->s_fs_info;
1001 struct gfs2_statfs_change_host sc;
1002 int error;
1003
1004 error = gfs2_rindex_update(sdp);
1005 if (error)
1006 return error;
1007
1008 if (gfs2_tune_get(sdp, gt_statfs_slow))
1009 error = gfs2_statfs_slow(sdp, &sc);
1010 else
1011 error = gfs2_statfs_i(sdp, &sc);
1012
1013 if (error)
1014 return error;
1015
1016 buf->f_type = GFS2_MAGIC;
1017 buf->f_bsize = sdp->sd_sb.sb_bsize;
1018 buf->f_blocks = sc.sc_total;
1019 buf->f_bfree = sc.sc_free;
1020 buf->f_bavail = sc.sc_free;
1021 buf->f_files = sc.sc_dinodes + sc.sc_free;
1022 buf->f_ffree = sc.sc_free;
1023 buf->f_namelen = GFS2_FNAMESIZE;
1024
1025 return 0;
1026 }
1027
1028 /**
1029 * gfs2_drop_inode - Drop an inode (test for remote unlink)
1030 * @inode: The inode to drop
1031 *
1032 * If we've received a callback on an iopen lock then it's because a
1033 * remote node tried to deallocate the inode but failed due to this node
1034 * still having the inode open. Here we mark the link count zero
1035 * since we know that it must have reached zero if the GLF_DEMOTE flag
1036 * is set on the iopen glock. If we didn't do a disk read since the
1037 * remote node removed the final link then we might otherwise miss
1038 * this event. This check ensures that this node will deallocate the
1039 * inode's blocks, or alternatively pass the baton on to another
1040 * node for later deallocation.
1041 */
1042
1043 static int gfs2_drop_inode(struct inode *inode)
1044 {
1045 struct gfs2_inode *ip = GFS2_I(inode);
1046
1047 if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
1048 inode->i_nlink &&
1049 gfs2_holder_initialized(&ip->i_iopen_gh)) {
1050 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1051 if (test_bit(GLF_DEMOTE, &gl->gl_flags))
1052 clear_nlink(inode);
1053 }
1054
1055 /*
1056 * When under memory pressure when an inode's link count has dropped to
1057 * zero, defer deleting the inode to the delete workqueue. This avoids
1058 * calling into DLM under memory pressure, which can deadlock.
1059 */
1060 if (!inode->i_nlink &&
1061 unlikely(current->flags & PF_MEMALLOC) &&
1062 gfs2_holder_initialized(&ip->i_iopen_gh)) {
1063 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1064
1065 gfs2_glock_hold(gl);
1066 if (!gfs2_queue_delete_work(gl, 0))
1067 gfs2_glock_queue_put(gl);
1068 return false;
1069 }
1070
1071 return generic_drop_inode(inode);
1072 }
1073
1074 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1075 {
1076 do {
1077 if (d1 == d2)
1078 return 1;
1079 d1 = d1->d_parent;
1080 } while (!IS_ROOT(d1));
1081 return 0;
1082 }
1083
1084 /**
1085 * gfs2_show_options - Show mount options for /proc/mounts
1086 * @s: seq_file structure
1087 * @root: root of this (sub)tree
1088 *
1089 * Returns: 0 on success or error code
1090 */
1091
1092 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1093 {
1094 struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1095 struct gfs2_args *args = &sdp->sd_args;
1096 int val;
1097
1098 if (is_ancestor(root, sdp->sd_master_dir))
1099 seq_puts(s, ",meta");
1100 if (args->ar_lockproto[0])
1101 seq_show_option(s, "lockproto", args->ar_lockproto);
1102 if (args->ar_locktable[0])
1103 seq_show_option(s, "locktable", args->ar_locktable);
1104 if (args->ar_hostdata[0])
1105 seq_show_option(s, "hostdata", args->ar_hostdata);
1106 if (args->ar_spectator)
1107 seq_puts(s, ",spectator");
1108 if (args->ar_localflocks)
1109 seq_puts(s, ",localflocks");
1110 if (args->ar_debug)
1111 seq_puts(s, ",debug");
1112 if (args->ar_posix_acl)
1113 seq_puts(s, ",acl");
1114 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1115 char *state;
1116 switch (args->ar_quota) {
1117 case GFS2_QUOTA_OFF:
1118 state = "off";
1119 break;
1120 case GFS2_QUOTA_ACCOUNT:
1121 state = "account";
1122 break;
1123 case GFS2_QUOTA_ON:
1124 state = "on";
1125 break;
1126 default:
1127 state = "unknown";
1128 break;
1129 }
1130 seq_printf(s, ",quota=%s", state);
1131 }
1132 if (args->ar_suiddir)
1133 seq_puts(s, ",suiddir");
1134 if (args->ar_data != GFS2_DATA_DEFAULT) {
1135 char *state;
1136 switch (args->ar_data) {
1137 case GFS2_DATA_WRITEBACK:
1138 state = "writeback";
1139 break;
1140 case GFS2_DATA_ORDERED:
1141 state = "ordered";
1142 break;
1143 default:
1144 state = "unknown";
1145 break;
1146 }
1147 seq_printf(s, ",data=%s", state);
1148 }
1149 if (args->ar_discard)
1150 seq_puts(s, ",discard");
1151 val = sdp->sd_tune.gt_logd_secs;
1152 if (val != 30)
1153 seq_printf(s, ",commit=%d", val);
1154 val = sdp->sd_tune.gt_statfs_quantum;
1155 if (val != 30)
1156 seq_printf(s, ",statfs_quantum=%d", val);
1157 else if (sdp->sd_tune.gt_statfs_slow)
1158 seq_puts(s, ",statfs_quantum=0");
1159 val = sdp->sd_tune.gt_quota_quantum;
1160 if (val != 60)
1161 seq_printf(s, ",quota_quantum=%d", val);
1162 if (args->ar_statfs_percent)
1163 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1164 if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1165 const char *state;
1166
1167 switch (args->ar_errors) {
1168 case GFS2_ERRORS_WITHDRAW:
1169 state = "withdraw";
1170 break;
1171 case GFS2_ERRORS_PANIC:
1172 state = "panic";
1173 break;
1174 default:
1175 state = "unknown";
1176 break;
1177 }
1178 seq_printf(s, ",errors=%s", state);
1179 }
1180 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1181 seq_puts(s, ",nobarrier");
1182 if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1183 seq_puts(s, ",demote_interface_used");
1184 if (args->ar_rgrplvb)
1185 seq_puts(s, ",rgrplvb");
1186 if (args->ar_loccookie)
1187 seq_puts(s, ",loccookie");
1188 return 0;
1189 }
1190
1191 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1192 {
1193 struct inode *inode = &ip->i_inode;
1194 struct gfs2_glock *gl = ip->i_gl;
1195
1196 truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1197 truncate_inode_pages(&inode->i_data, 0);
1198
1199 if (atomic_read(&gl->gl_revokes) == 0) {
1200 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1201 clear_bit(GLF_DIRTY, &gl->gl_flags);
1202 }
1203 }
1204
1205 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1206 {
1207 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1208 struct gfs2_rgrpd *rgd;
1209 struct gfs2_holder gh;
1210 int error;
1211
1212 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1213 gfs2_consist_inode(ip);
1214 return -EIO;
1215 }
1216
1217 error = gfs2_rindex_update(sdp);
1218 if (error)
1219 return error;
1220
1221 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1222 if (error)
1223 return error;
1224
1225 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1226 if (!rgd) {
1227 gfs2_consist_inode(ip);
1228 error = -EIO;
1229 goto out_qs;
1230 }
1231
1232 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1233 if (error)
1234 goto out_qs;
1235
1236 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1237 sdp->sd_jdesc->jd_blocks);
1238 if (error)
1239 goto out_rg_gunlock;
1240
1241 gfs2_free_di(rgd, ip);
1242
1243 gfs2_final_release_pages(ip);
1244
1245 gfs2_trans_end(sdp);
1246
1247 out_rg_gunlock:
1248 gfs2_glock_dq_uninit(&gh);
1249 out_qs:
1250 gfs2_quota_unhold(ip);
1251 return error;
1252 }
1253
1254 /**
1255 * gfs2_glock_put_eventually
1256 * @gl: The glock to put
1257 *
1258 * When under memory pressure, trigger a deferred glock put to make sure we
1259 * won't call into DLM and deadlock. Otherwise, put the glock directly.
1260 */
1261
1262 static void gfs2_glock_put_eventually(struct gfs2_glock *gl)
1263 {
1264 if (current->flags & PF_MEMALLOC)
1265 gfs2_glock_queue_put(gl);
1266 else
1267 gfs2_glock_put(gl);
1268 }
1269
1270 static bool gfs2_upgrade_iopen_glock(struct inode *inode)
1271 {
1272 struct gfs2_inode *ip = GFS2_I(inode);
1273 struct gfs2_sbd *sdp = GFS2_SB(inode);
1274 struct gfs2_holder *gh = &ip->i_iopen_gh;
1275 long timeout = 5 * HZ;
1276 int error;
1277
1278 gh->gh_flags |= GL_NOCACHE;
1279 gfs2_glock_dq_wait(gh);
1280
1281 /*
1282 * If there are no other lock holders, we'll get the lock immediately.
1283 * Otherwise, the other nodes holding the lock will be notified about
1284 * our locking request. If they don't have the inode open, they'll
1285 * evict the cached inode and release the lock. Otherwise, if they
1286 * poke the inode glock, we'll take this as an indication that they
1287 * still need the iopen glock and that they'll take care of deleting
1288 * the inode when they're done. As a last resort, if another node
1289 * keeps holding the iopen glock without showing any activity on the
1290 * inode glock, we'll eventually time out.
1291 *
1292 * Note that we're passing the LM_FLAG_TRY_1CB flag to the first
1293 * locking request as an optimization to notify lock holders as soon as
1294 * possible. Without that flag, they'd be notified implicitly by the
1295 * second locking request.
1296 */
1297
1298 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, gh);
1299 error = gfs2_glock_nq(gh);
1300 if (error != GLR_TRYFAILED)
1301 return !error;
1302
1303 gfs2_holder_reinit(LM_ST_EXCLUSIVE, GL_ASYNC | GL_NOCACHE, gh);
1304 error = gfs2_glock_nq(gh);
1305 if (error)
1306 return false;
1307
1308 timeout = wait_event_interruptible_timeout(sdp->sd_async_glock_wait,
1309 !test_bit(HIF_WAIT, &gh->gh_iflags) ||
1310 test_bit(GLF_DEMOTE, &ip->i_gl->gl_flags),
1311 timeout);
1312 if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) {
1313 gfs2_glock_dq(gh);
1314 return false;
1315 }
1316 return true;
1317 }
1318
1319 /**
1320 * evict_should_delete - determine whether the inode is eligible for deletion
1321 * @inode: The inode to evict
1322 *
1323 * This function determines whether the evicted inode is eligible to be deleted
1324 * and locks the inode glock.
1325 *
1326 * Returns: the fate of the dinode
1327 */
1328 static enum dinode_demise evict_should_delete(struct inode *inode,
1329 struct gfs2_holder *gh)
1330 {
1331 struct gfs2_inode *ip = GFS2_I(inode);
1332 struct super_block *sb = inode->i_sb;
1333 struct gfs2_sbd *sdp = sb->s_fs_info;
1334 int ret;
1335
1336 if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1337 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
1338 goto should_delete;
1339 }
1340
1341 if (test_bit(GIF_DEFERRED_DELETE, &ip->i_flags))
1342 return SHOULD_DEFER_EVICTION;
1343
1344 /* Deletes should never happen under memory pressure anymore. */
1345 if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
1346 return SHOULD_DEFER_EVICTION;
1347
1348 /* Must not read inode block until block type has been verified */
1349 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, gh);
1350 if (unlikely(ret)) {
1351 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1352 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1353 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1354 return SHOULD_DEFER_EVICTION;
1355 }
1356
1357 if (gfs2_inode_already_deleted(ip->i_gl, ip->i_no_formal_ino))
1358 return SHOULD_NOT_DELETE_DINODE;
1359 ret = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1360 if (ret)
1361 return SHOULD_NOT_DELETE_DINODE;
1362
1363 if (test_bit(GIF_INVALID, &ip->i_flags)) {
1364 ret = gfs2_inode_refresh(ip);
1365 if (ret)
1366 return SHOULD_NOT_DELETE_DINODE;
1367 }
1368
1369 /*
1370 * The inode may have been recreated in the meantime.
1371 */
1372 if (inode->i_nlink)
1373 return SHOULD_NOT_DELETE_DINODE;
1374
1375 should_delete:
1376 if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
1377 test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1378 if (!gfs2_upgrade_iopen_glock(inode)) {
1379 gfs2_holder_uninit(&ip->i_iopen_gh);
1380 return SHOULD_NOT_DELETE_DINODE;
1381 }
1382 }
1383 return SHOULD_DELETE_DINODE;
1384 }
1385
1386 /**
1387 * evict_unlinked_inode - delete the pieces of an unlinked evicted inode
1388 * @inode: The inode to evict
1389 */
1390 static int evict_unlinked_inode(struct inode *inode)
1391 {
1392 struct gfs2_inode *ip = GFS2_I(inode);
1393 int ret;
1394
1395 if (S_ISDIR(inode->i_mode) &&
1396 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1397 ret = gfs2_dir_exhash_dealloc(ip);
1398 if (ret)
1399 goto out;
1400 }
1401
1402 if (ip->i_eattr) {
1403 ret = gfs2_ea_dealloc(ip);
1404 if (ret)
1405 goto out;
1406 }
1407
1408 if (!gfs2_is_stuffed(ip)) {
1409 ret = gfs2_file_dealloc(ip);
1410 if (ret)
1411 goto out;
1412 }
1413
1414 /* We're about to clear the bitmap for the dinode, but as soon as we
1415 do, gfs2_create_inode can create another inode at the same block
1416 location and try to set gl_object again. We clear gl_object here so
1417 that subsequent inode creates don't see an old gl_object. */
1418 glock_clear_object(ip->i_gl, ip);
1419 ret = gfs2_dinode_dealloc(ip);
1420 gfs2_inode_remember_delete(ip->i_gl, ip->i_no_formal_ino);
1421 out:
1422 return ret;
1423 }
1424
1425 /*
1426 * evict_linked_inode - evict an inode whose dinode has not been unlinked
1427 * @inode: The inode to evict
1428 */
1429 static int evict_linked_inode(struct inode *inode)
1430 {
1431 struct super_block *sb = inode->i_sb;
1432 struct gfs2_sbd *sdp = sb->s_fs_info;
1433 struct gfs2_inode *ip = GFS2_I(inode);
1434 struct address_space *metamapping;
1435 int ret;
1436
1437 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
1438 GFS2_LFC_EVICT_INODE);
1439 metamapping = gfs2_glock2aspace(ip->i_gl);
1440 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1441 filemap_fdatawrite(metamapping);
1442 filemap_fdatawait(metamapping);
1443 }
1444 write_inode_now(inode, 1);
1445 gfs2_ail_flush(ip->i_gl, 0);
1446
1447 ret = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1448 if (ret)
1449 return ret;
1450
1451 /* Needs to be done before glock release & also in a transaction */
1452 truncate_inode_pages(&inode->i_data, 0);
1453 truncate_inode_pages(metamapping, 0);
1454 gfs2_trans_end(sdp);
1455 return 0;
1456 }
1457
1458 /**
1459 * gfs2_evict_inode - Remove an inode from cache
1460 * @inode: The inode to evict
1461 *
1462 * There are three cases to consider:
1463 * 1. i_nlink == 0, we are final opener (and must deallocate)
1464 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1465 * 3. i_nlink > 0
1466 *
1467 * If the fs is read only, then we have to treat all cases as per #3
1468 * since we are unable to do any deallocation. The inode will be
1469 * deallocated by the next read/write node to attempt an allocation
1470 * in the same resource group
1471 *
1472 * We have to (at the moment) hold the inodes main lock to cover
1473 * the gap between unlocking the shared lock on the iopen lock and
1474 * taking the exclusive lock. I'd rather do a shared -> exclusive
1475 * conversion on the iopen lock, but we can change that later. This
1476 * is safe, just less efficient.
1477 */
1478
1479 static void gfs2_evict_inode(struct inode *inode)
1480 {
1481 struct super_block *sb = inode->i_sb;
1482 struct gfs2_sbd *sdp = sb->s_fs_info;
1483 struct gfs2_inode *ip = GFS2_I(inode);
1484 struct gfs2_holder gh;
1485 int ret;
1486
1487 if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1488 clear_inode(inode);
1489 return;
1490 }
1491
1492 if (inode->i_nlink || sb_rdonly(sb))
1493 goto out;
1494
1495 gfs2_holder_mark_uninitialized(&gh);
1496 ret = evict_should_delete(inode, &gh);
1497 if (ret == SHOULD_DEFER_EVICTION)
1498 goto out;
1499 if (ret == SHOULD_DELETE_DINODE)
1500 ret = evict_unlinked_inode(inode);
1501 else
1502 ret = evict_linked_inode(inode);
1503
1504 if (gfs2_rs_active(&ip->i_res))
1505 gfs2_rs_deltree(&ip->i_res);
1506
1507 if (gfs2_holder_initialized(&gh)) {
1508 glock_clear_object(ip->i_gl, ip);
1509 gfs2_glock_dq_uninit(&gh);
1510 }
1511 if (ret && ret != GLR_TRYFAILED && ret != -EROFS)
1512 fs_warn(sdp, "gfs2_evict_inode: %d\n", ret);
1513 out:
1514 truncate_inode_pages_final(&inode->i_data);
1515 if (ip->i_qadata)
1516 gfs2_assert_warn(sdp, ip->i_qadata->qa_ref == 0);
1517 gfs2_rs_delete(ip, NULL);
1518 gfs2_ordered_del_inode(ip);
1519 clear_inode(inode);
1520 gfs2_dir_hash_inval(ip);
1521 if (ip->i_gl) {
1522 glock_clear_object(ip->i_gl, ip);
1523 wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
1524 gfs2_glock_add_to_lru(ip->i_gl);
1525 gfs2_glock_put_eventually(ip->i_gl);
1526 ip->i_gl = NULL;
1527 }
1528 if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1529 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1530
1531 glock_clear_object(gl, ip);
1532 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1533 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1534 gfs2_glock_dq(&ip->i_iopen_gh);
1535 }
1536 gfs2_glock_hold(gl);
1537 gfs2_holder_uninit(&ip->i_iopen_gh);
1538 gfs2_glock_put_eventually(gl);
1539 }
1540 }
1541
1542 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1543 {
1544 struct gfs2_inode *ip;
1545
1546 ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1547 if (!ip)
1548 return NULL;
1549 ip->i_flags = 0;
1550 ip->i_gl = NULL;
1551 gfs2_holder_mark_uninitialized(&ip->i_iopen_gh);
1552 memset(&ip->i_res, 0, sizeof(ip->i_res));
1553 RB_CLEAR_NODE(&ip->i_res.rs_node);
1554 ip->i_rahead = 0;
1555 return &ip->i_inode;
1556 }
1557
1558 static void gfs2_free_inode(struct inode *inode)
1559 {
1560 kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode));
1561 }
1562
1563 extern void free_local_statfs_inodes(struct gfs2_sbd *sdp)
1564 {
1565 struct local_statfs_inode *lsi, *safe;
1566
1567 /* Run through the statfs inodes list to iput and free memory */
1568 list_for_each_entry_safe(lsi, safe, &sdp->sd_sc_inodes_list, si_list) {
1569 if (lsi->si_jid == sdp->sd_jdesc->jd_jid)
1570 sdp->sd_sc_inode = NULL; /* belongs to this node */
1571 if (lsi->si_sc_inode)
1572 iput(lsi->si_sc_inode);
1573 list_del(&lsi->si_list);
1574 kfree(lsi);
1575 }
1576 }
1577
1578 extern struct inode *find_local_statfs_inode(struct gfs2_sbd *sdp,
1579 unsigned int index)
1580 {
1581 struct local_statfs_inode *lsi;
1582
1583 /* Return the local (per node) statfs inode in the
1584 * sdp->sd_sc_inodes_list corresponding to the 'index'. */
1585 list_for_each_entry(lsi, &sdp->sd_sc_inodes_list, si_list) {
1586 if (lsi->si_jid == index)
1587 return lsi->si_sc_inode;
1588 }
1589 return NULL;
1590 }
1591
1592 const struct super_operations gfs2_super_ops = {
1593 .alloc_inode = gfs2_alloc_inode,
1594 .free_inode = gfs2_free_inode,
1595 .write_inode = gfs2_write_inode,
1596 .dirty_inode = gfs2_dirty_inode,
1597 .evict_inode = gfs2_evict_inode,
1598 .put_super = gfs2_put_super,
1599 .sync_fs = gfs2_sync_fs,
1600 .freeze_super = gfs2_freeze,
1601 .thaw_super = gfs2_unfreeze,
1602 .statfs = gfs2_statfs,
1603 .drop_inode = gfs2_drop_inode,
1604 .show_options = gfs2_show_options,
1605 };
1606
Linux with added FPC-III support