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
gfs2_jindex_free(struct gfs2_sbd * sdp)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
jdesc_find_i(struct list_head * head,unsigned int jid)81 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
82 {
83 struct gfs2_jdesc *jd;
84
85 list_for_each_entry(jd, head, jd_list) {
86 if (jd->jd_jid == jid)
87 return jd;
88 }
89 return NULL;
90 }
91
gfs2_jdesc_find(struct gfs2_sbd * sdp,unsigned int jid)92 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
93 {
94 struct gfs2_jdesc *jd;
95
96 spin_lock(&sdp->sd_jindex_spin);
97 jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
98 spin_unlock(&sdp->sd_jindex_spin);
99
100 return jd;
101 }
102
gfs2_jdesc_check(struct gfs2_jdesc * jd)103 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
104 {
105 struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
106 struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
107 u64 size = i_size_read(jd->jd_inode);
108
109 if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30)))
110 return -EIO;
111
112 jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
113
114 if (gfs2_write_alloc_required(ip, 0, size)) {
115 gfs2_consist_inode(ip);
116 return -EIO;
117 }
118
119 return 0;
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_log_header_host head;
134 int error;
135
136 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
137 if (gfs2_withdrawn(sdp))
138 return -EIO;
139
140 error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
141 if (error) {
142 gfs2_consist(sdp);
143 return error;
144 }
145
146 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
147 gfs2_consist(sdp);
148 return -EIO;
149 }
150
151 /* Initialize some head of the log stuff */
152 sdp->sd_log_sequence = head.lh_sequence + 1;
153 gfs2_log_pointers_init(sdp, head.lh_blkno);
154
155 error = gfs2_quota_init(sdp);
156 if (!error && gfs2_withdrawn(sdp))
157 error = -EIO;
158 if (!error)
159 set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
160 return error;
161 }
162
gfs2_statfs_change_in(struct gfs2_statfs_change_host * sc,const void * buf)163 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
164 {
165 const struct gfs2_statfs_change *str = buf;
166
167 sc->sc_total = be64_to_cpu(str->sc_total);
168 sc->sc_free = be64_to_cpu(str->sc_free);
169 sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
170 }
171
gfs2_statfs_change_out(const struct gfs2_statfs_change_host * sc,void * buf)172 void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
173 {
174 struct gfs2_statfs_change *str = buf;
175
176 str->sc_total = cpu_to_be64(sc->sc_total);
177 str->sc_free = cpu_to_be64(sc->sc_free);
178 str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
179 }
180
gfs2_statfs_init(struct gfs2_sbd * sdp)181 int gfs2_statfs_init(struct gfs2_sbd *sdp)
182 {
183 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
184 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
185 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
186 struct buffer_head *m_bh;
187 struct gfs2_holder gh;
188 int error;
189
190 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
191 &gh);
192 if (error)
193 return error;
194
195 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
196 if (error)
197 goto out;
198
199 if (sdp->sd_args.ar_spectator) {
200 spin_lock(&sdp->sd_statfs_spin);
201 gfs2_statfs_change_in(m_sc, m_bh->b_data +
202 sizeof(struct gfs2_dinode));
203 spin_unlock(&sdp->sd_statfs_spin);
204 } else {
205 spin_lock(&sdp->sd_statfs_spin);
206 gfs2_statfs_change_in(m_sc, m_bh->b_data +
207 sizeof(struct gfs2_dinode));
208 gfs2_statfs_change_in(l_sc, sdp->sd_sc_bh->b_data +
209 sizeof(struct gfs2_dinode));
210 spin_unlock(&sdp->sd_statfs_spin);
211
212 }
213
214 brelse(m_bh);
215 out:
216 gfs2_glock_dq_uninit(&gh);
217 return 0;
218 }
219
gfs2_statfs_change(struct gfs2_sbd * sdp,s64 total,s64 free,s64 dinodes)220 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
221 s64 dinodes)
222 {
223 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
224 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
225 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
226 s64 x, y;
227 int need_sync = 0;
228
229 gfs2_trans_add_meta(l_ip->i_gl, sdp->sd_sc_bh);
230
231 spin_lock(&sdp->sd_statfs_spin);
232 l_sc->sc_total += total;
233 l_sc->sc_free += free;
234 l_sc->sc_dinodes += dinodes;
235 gfs2_statfs_change_out(l_sc, sdp->sd_sc_bh->b_data +
236 sizeof(struct gfs2_dinode));
237 if (sdp->sd_args.ar_statfs_percent) {
238 x = 100 * l_sc->sc_free;
239 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
240 if (x >= y || x <= -y)
241 need_sync = 1;
242 }
243 spin_unlock(&sdp->sd_statfs_spin);
244
245 if (need_sync)
246 gfs2_wake_up_statfs(sdp);
247 }
248
update_statfs(struct gfs2_sbd * sdp,struct buffer_head * m_bh)249 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh)
250 {
251 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
252 struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
253 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
254 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
255
256 gfs2_trans_add_meta(l_ip->i_gl, sdp->sd_sc_bh);
257 gfs2_trans_add_meta(m_ip->i_gl, m_bh);
258
259 spin_lock(&sdp->sd_statfs_spin);
260 m_sc->sc_total += l_sc->sc_total;
261 m_sc->sc_free += l_sc->sc_free;
262 m_sc->sc_dinodes += l_sc->sc_dinodes;
263 memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
264 memset(sdp->sd_sc_bh->b_data + sizeof(struct gfs2_dinode),
265 0, sizeof(struct gfs2_statfs_change));
266 gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
267 spin_unlock(&sdp->sd_statfs_spin);
268 }
269
gfs2_statfs_sync(struct super_block * sb,int type)270 int gfs2_statfs_sync(struct super_block *sb, int type)
271 {
272 struct gfs2_sbd *sdp = sb->s_fs_info;
273 struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
274 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
275 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
276 struct gfs2_holder gh;
277 struct buffer_head *m_bh;
278 int error;
279
280 error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
281 &gh);
282 if (error)
283 goto out;
284
285 error = gfs2_meta_inode_buffer(m_ip, &m_bh);
286 if (error)
287 goto out_unlock;
288
289 spin_lock(&sdp->sd_statfs_spin);
290 gfs2_statfs_change_in(m_sc, m_bh->b_data +
291 sizeof(struct gfs2_dinode));
292 if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
293 spin_unlock(&sdp->sd_statfs_spin);
294 goto out_bh;
295 }
296 spin_unlock(&sdp->sd_statfs_spin);
297
298 error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
299 if (error)
300 goto out_bh;
301
302 update_statfs(sdp, m_bh);
303 sdp->sd_statfs_force_sync = 0;
304
305 gfs2_trans_end(sdp);
306
307 out_bh:
308 brelse(m_bh);
309 out_unlock:
310 gfs2_glock_dq_uninit(&gh);
311 out:
312 return error;
313 }
314
315 struct lfcc {
316 struct list_head list;
317 struct gfs2_holder gh;
318 };
319
320 /**
321 * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
322 * journals are clean
323 * @sdp: the file system
324 *
325 * Returns: errno
326 */
327
gfs2_lock_fs_check_clean(struct gfs2_sbd * sdp)328 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp)
329 {
330 struct gfs2_inode *ip;
331 struct gfs2_jdesc *jd;
332 struct lfcc *lfcc;
333 LIST_HEAD(list);
334 struct gfs2_log_header_host lh;
335 int error;
336
337 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
338 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
339 if (!lfcc) {
340 error = -ENOMEM;
341 goto out;
342 }
343 ip = GFS2_I(jd->jd_inode);
344 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
345 if (error) {
346 kfree(lfcc);
347 goto out;
348 }
349 list_add(&lfcc->list, &list);
350 }
351
352 error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
353 LM_FLAG_NOEXP | GL_NOPID,
354 &sdp->sd_freeze_gh);
355 if (error)
356 goto out;
357
358 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
359 error = gfs2_jdesc_check(jd);
360 if (error)
361 break;
362 error = gfs2_find_jhead(jd, &lh, false);
363 if (error)
364 break;
365 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
366 error = -EBUSY;
367 break;
368 }
369 }
370
371 if (error)
372 gfs2_freeze_unlock(&sdp->sd_freeze_gh);
373
374 out:
375 while (!list_empty(&list)) {
376 lfcc = list_first_entry(&list, struct lfcc, list);
377 list_del(&lfcc->list);
378 gfs2_glock_dq_uninit(&lfcc->gh);
379 kfree(lfcc);
380 }
381 return error;
382 }
383
gfs2_dinode_out(const struct gfs2_inode * ip,void * buf)384 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
385 {
386 const struct inode *inode = &ip->i_inode;
387 struct gfs2_dinode *str = buf;
388
389 str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
390 str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
391 str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
392 str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
393 str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
394 str->di_mode = cpu_to_be32(inode->i_mode);
395 str->di_uid = cpu_to_be32(i_uid_read(inode));
396 str->di_gid = cpu_to_be32(i_gid_read(inode));
397 str->di_nlink = cpu_to_be32(inode->i_nlink);
398 str->di_size = cpu_to_be64(i_size_read(inode));
399 str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(inode));
400 str->di_atime = cpu_to_be64(inode->i_atime.tv_sec);
401 str->di_mtime = cpu_to_be64(inode->i_mtime.tv_sec);
402 str->di_ctime = cpu_to_be64(inode->i_ctime.tv_sec);
403
404 str->di_goal_meta = cpu_to_be64(ip->i_goal);
405 str->di_goal_data = cpu_to_be64(ip->i_goal);
406 str->di_generation = cpu_to_be64(ip->i_generation);
407
408 str->di_flags = cpu_to_be32(ip->i_diskflags);
409 str->di_height = cpu_to_be16(ip->i_height);
410 str->di_payload_format = cpu_to_be32(S_ISDIR(inode->i_mode) &&
411 !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
412 GFS2_FORMAT_DE : 0);
413 str->di_depth = cpu_to_be16(ip->i_depth);
414 str->di_entries = cpu_to_be32(ip->i_entries);
415
416 str->di_eattr = cpu_to_be64(ip->i_eattr);
417 str->di_atime_nsec = cpu_to_be32(inode->i_atime.tv_nsec);
418 str->di_mtime_nsec = cpu_to_be32(inode->i_mtime.tv_nsec);
419 str->di_ctime_nsec = cpu_to_be32(inode->i_ctime.tv_nsec);
420 }
421
422 /**
423 * gfs2_write_inode - Make sure the inode is stable on the disk
424 * @inode: The inode
425 * @wbc: The writeback control structure
426 *
427 * Returns: errno
428 */
429
gfs2_write_inode(struct inode * inode,struct writeback_control * wbc)430 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
431 {
432 struct gfs2_inode *ip = GFS2_I(inode);
433 struct gfs2_sbd *sdp = GFS2_SB(inode);
434 struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
435 struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
436 int ret = 0;
437 bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
438
439 if (flush_all)
440 gfs2_log_flush(GFS2_SB(inode), ip->i_gl,
441 GFS2_LOG_HEAD_FLUSH_NORMAL |
442 GFS2_LFC_WRITE_INODE);
443 if (bdi->wb.dirty_exceeded)
444 gfs2_ail1_flush(sdp, wbc);
445 else
446 filemap_fdatawrite(metamapping);
447 if (flush_all)
448 ret = filemap_fdatawait(metamapping);
449 if (ret)
450 mark_inode_dirty_sync(inode);
451 else {
452 spin_lock(&inode->i_lock);
453 if (!(inode->i_flags & I_DIRTY))
454 gfs2_ordered_del_inode(ip);
455 spin_unlock(&inode->i_lock);
456 }
457 return ret;
458 }
459
460 /**
461 * gfs2_dirty_inode - check for atime updates
462 * @inode: The inode in question
463 * @flags: The type of dirty
464 *
465 * Unfortunately it can be called under any combination of inode
466 * glock and transaction lock, so we have to check carefully.
467 *
468 * At the moment this deals only with atime - it should be possible
469 * to expand that role in future, once a review of the locking has
470 * been carried out.
471 */
472
gfs2_dirty_inode(struct inode * inode,int flags)473 static void gfs2_dirty_inode(struct inode *inode, int flags)
474 {
475 struct gfs2_inode *ip = GFS2_I(inode);
476 struct gfs2_sbd *sdp = GFS2_SB(inode);
477 struct buffer_head *bh;
478 struct gfs2_holder gh;
479 int need_unlock = 0;
480 int need_endtrans = 0;
481 int ret;
482
483 if (unlikely(!ip->i_gl)) {
484 /* This can only happen during incomplete inode creation. */
485 BUG_ON(!test_bit(GIF_ALLOC_FAILED, &ip->i_flags));
486 return;
487 }
488
489 if (unlikely(gfs2_withdrawn(sdp)))
490 return;
491 if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
492 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
493 if (ret) {
494 fs_err(sdp, "dirty_inode: glock %d\n", ret);
495 gfs2_dump_glock(NULL, ip->i_gl, true);
496 return;
497 }
498 need_unlock = 1;
499 } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
500 return;
501
502 if (current->journal_info == NULL) {
503 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
504 if (ret) {
505 fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
506 goto out;
507 }
508 need_endtrans = 1;
509 }
510
511 ret = gfs2_meta_inode_buffer(ip, &bh);
512 if (ret == 0) {
513 gfs2_trans_add_meta(ip->i_gl, bh);
514 gfs2_dinode_out(ip, bh->b_data);
515 brelse(bh);
516 }
517
518 if (need_endtrans)
519 gfs2_trans_end(sdp);
520 out:
521 if (need_unlock)
522 gfs2_glock_dq_uninit(&gh);
523 }
524
525 /**
526 * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
527 * @sdp: the filesystem
528 *
529 * Returns: errno
530 */
531
gfs2_make_fs_ro(struct gfs2_sbd * sdp)532 void gfs2_make_fs_ro(struct gfs2_sbd *sdp)
533 {
534 int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
535
536 if (!test_bit(SDF_DEACTIVATING, &sdp->sd_flags))
537 gfs2_flush_delete_work(sdp);
538
539 if (!log_write_allowed && current == sdp->sd_quotad_process)
540 fs_warn(sdp, "The quotad daemon is withdrawing.\n");
541 else if (sdp->sd_quotad_process)
542 kthread_stop(sdp->sd_quotad_process);
543 sdp->sd_quotad_process = NULL;
544
545 if (!log_write_allowed && current == sdp->sd_logd_process)
546 fs_warn(sdp, "The logd daemon is withdrawing.\n");
547 else if (sdp->sd_logd_process)
548 kthread_stop(sdp->sd_logd_process);
549 sdp->sd_logd_process = NULL;
550
551 if (log_write_allowed) {
552 gfs2_quota_sync(sdp->sd_vfs, 0);
553 gfs2_statfs_sync(sdp->sd_vfs, 0);
554
555 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
556 GFS2_LFC_MAKE_FS_RO);
557 wait_event_timeout(sdp->sd_log_waitq,
558 gfs2_log_is_empty(sdp),
559 HZ * 5);
560 gfs2_assert_warn(sdp, gfs2_log_is_empty(sdp));
561 } else {
562 wait_event_timeout(sdp->sd_log_waitq,
563 gfs2_log_is_empty(sdp),
564 HZ * 5);
565 }
566 gfs2_quota_cleanup(sdp);
567
568 if (!log_write_allowed)
569 sdp->sd_vfs->s_flags |= SB_RDONLY;
570 }
571
572 /**
573 * gfs2_put_super - Unmount the filesystem
574 * @sb: The VFS superblock
575 *
576 */
577
gfs2_put_super(struct super_block * sb)578 static void gfs2_put_super(struct super_block *sb)
579 {
580 struct gfs2_sbd *sdp = sb->s_fs_info;
581 struct gfs2_jdesc *jd;
582
583 /* No more recovery requests */
584 set_bit(SDF_NORECOVERY, &sdp->sd_flags);
585 smp_mb();
586
587 /* Wait on outstanding recovery */
588 restart:
589 spin_lock(&sdp->sd_jindex_spin);
590 list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
591 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
592 continue;
593 spin_unlock(&sdp->sd_jindex_spin);
594 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
595 TASK_UNINTERRUPTIBLE);
596 goto restart;
597 }
598 spin_unlock(&sdp->sd_jindex_spin);
599
600 if (!sb_rdonly(sb)) {
601 gfs2_make_fs_ro(sdp);
602 }
603 WARN_ON(gfs2_withdrawing(sdp));
604
605 /* At this point, we're through modifying the disk */
606
607 /* Release stuff */
608
609 iput(sdp->sd_jindex);
610 iput(sdp->sd_statfs_inode);
611 iput(sdp->sd_rindex);
612 iput(sdp->sd_quota_inode);
613
614 gfs2_glock_put(sdp->sd_rename_gl);
615 gfs2_glock_put(sdp->sd_freeze_gl);
616
617 if (!sdp->sd_args.ar_spectator) {
618 if (gfs2_holder_initialized(&sdp->sd_journal_gh))
619 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
620 if (gfs2_holder_initialized(&sdp->sd_jinode_gh))
621 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
622 brelse(sdp->sd_sc_bh);
623 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
624 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
625 free_local_statfs_inodes(sdp);
626 iput(sdp->sd_qc_inode);
627 }
628
629 gfs2_glock_dq_uninit(&sdp->sd_live_gh);
630 gfs2_clear_rgrpd(sdp);
631 gfs2_jindex_free(sdp);
632 /* Take apart glock structures and buffer lists */
633 gfs2_gl_hash_clear(sdp);
634 truncate_inode_pages_final(&sdp->sd_aspace);
635 gfs2_delete_debugfs_file(sdp);
636 /* Unmount the locking protocol */
637 gfs2_lm_unmount(sdp);
638
639 /* At this point, we're through participating in the lockspace */
640 gfs2_sys_fs_del(sdp);
641 free_sbd(sdp);
642 }
643
644 /**
645 * gfs2_sync_fs - sync the filesystem
646 * @sb: the superblock
647 * @wait: true to wait for completion
648 *
649 * Flushes the log to disk.
650 */
651
gfs2_sync_fs(struct super_block * sb,int wait)652 static int gfs2_sync_fs(struct super_block *sb, int wait)
653 {
654 struct gfs2_sbd *sdp = sb->s_fs_info;
655
656 gfs2_quota_sync(sb, -1);
657 if (wait)
658 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
659 GFS2_LFC_SYNC_FS);
660 return sdp->sd_log_error;
661 }
662
gfs2_freeze_func(struct work_struct * work)663 void gfs2_freeze_func(struct work_struct *work)
664 {
665 int error;
666 struct gfs2_holder freeze_gh;
667 struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
668 struct super_block *sb = sdp->sd_vfs;
669
670 atomic_inc(&sb->s_active);
671 error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
672 if (error) {
673 gfs2_assert_withdraw(sdp, 0);
674 } else {
675 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
676 error = thaw_super(sb);
677 if (error) {
678 fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n",
679 error);
680 gfs2_assert_withdraw(sdp, 0);
681 }
682 gfs2_freeze_unlock(&freeze_gh);
683 }
684 deactivate_super(sb);
685 clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags);
686 wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN);
687 return;
688 }
689
690 /**
691 * gfs2_freeze - prevent further writes to the filesystem
692 * @sb: the VFS structure for the filesystem
693 *
694 */
695
gfs2_freeze(struct super_block * sb)696 static int gfs2_freeze(struct super_block *sb)
697 {
698 struct gfs2_sbd *sdp = sb->s_fs_info;
699 int error;
700
701 mutex_lock(&sdp->sd_freeze_mutex);
702 if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN) {
703 error = -EBUSY;
704 goto out;
705 }
706
707 for (;;) {
708 if (gfs2_withdrawn(sdp)) {
709 error = -EINVAL;
710 goto out;
711 }
712
713 error = gfs2_lock_fs_check_clean(sdp);
714 if (!error)
715 break;
716
717 if (error == -EBUSY)
718 fs_err(sdp, "waiting for recovery before freeze\n");
719 else if (error == -EIO) {
720 fs_err(sdp, "Fatal IO error: cannot freeze gfs2 due "
721 "to recovery error.\n");
722 goto out;
723 } else {
724 fs_err(sdp, "error freezing FS: %d\n", error);
725 }
726 fs_err(sdp, "retrying...\n");
727 msleep(1000);
728 }
729 set_bit(SDF_FS_FROZEN, &sdp->sd_flags);
730 out:
731 mutex_unlock(&sdp->sd_freeze_mutex);
732 return error;
733 }
734
735 /**
736 * gfs2_unfreeze - reallow writes to the filesystem
737 * @sb: the VFS structure for the filesystem
738 *
739 */
740
gfs2_unfreeze(struct super_block * sb)741 static int gfs2_unfreeze(struct super_block *sb)
742 {
743 struct gfs2_sbd *sdp = sb->s_fs_info;
744
745 mutex_lock(&sdp->sd_freeze_mutex);
746 if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
747 !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
748 mutex_unlock(&sdp->sd_freeze_mutex);
749 return -EINVAL;
750 }
751
752 gfs2_freeze_unlock(&sdp->sd_freeze_gh);
753 mutex_unlock(&sdp->sd_freeze_mutex);
754 return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE);
755 }
756
757 /**
758 * statfs_slow_fill - fill in the sg for a given RG
759 * @rgd: the RG
760 * @sc: the sc structure
761 *
762 * Returns: 0 on success, -ESTALE if the LVB is invalid
763 */
764
statfs_slow_fill(struct gfs2_rgrpd * rgd,struct gfs2_statfs_change_host * sc)765 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
766 struct gfs2_statfs_change_host *sc)
767 {
768 gfs2_rgrp_verify(rgd);
769 sc->sc_total += rgd->rd_data;
770 sc->sc_free += rgd->rd_free;
771 sc->sc_dinodes += rgd->rd_dinodes;
772 return 0;
773 }
774
775 /**
776 * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
777 * @sdp: the filesystem
778 * @sc: the sc info that will be returned
779 *
780 * Any error (other than a signal) will cause this routine to fall back
781 * to the synchronous version.
782 *
783 * FIXME: This really shouldn't busy wait like this.
784 *
785 * Returns: errno
786 */
787
gfs2_statfs_slow(struct gfs2_sbd * sdp,struct gfs2_statfs_change_host * sc)788 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
789 {
790 struct gfs2_rgrpd *rgd_next;
791 struct gfs2_holder *gha, *gh;
792 unsigned int slots = 64;
793 unsigned int x;
794 int done;
795 int error = 0, err;
796
797 memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
798 gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
799 if (!gha)
800 return -ENOMEM;
801 for (x = 0; x < slots; x++)
802 gfs2_holder_mark_uninitialized(gha + x);
803
804 rgd_next = gfs2_rgrpd_get_first(sdp);
805
806 for (;;) {
807 done = 1;
808
809 for (x = 0; x < slots; x++) {
810 gh = gha + x;
811
812 if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
813 err = gfs2_glock_wait(gh);
814 if (err) {
815 gfs2_holder_uninit(gh);
816 error = err;
817 } else {
818 if (!error) {
819 struct gfs2_rgrpd *rgd =
820 gfs2_glock2rgrp(gh->gh_gl);
821
822 error = statfs_slow_fill(rgd, sc);
823 }
824 gfs2_glock_dq_uninit(gh);
825 }
826 }
827
828 if (gfs2_holder_initialized(gh))
829 done = 0;
830 else if (rgd_next && !error) {
831 error = gfs2_glock_nq_init(rgd_next->rd_gl,
832 LM_ST_SHARED,
833 GL_ASYNC,
834 gh);
835 rgd_next = gfs2_rgrpd_get_next(rgd_next);
836 done = 0;
837 }
838
839 if (signal_pending(current))
840 error = -ERESTARTSYS;
841 }
842
843 if (done)
844 break;
845
846 yield();
847 }
848
849 kfree(gha);
850 return error;
851 }
852
853 /**
854 * gfs2_statfs_i - Do a statfs
855 * @sdp: the filesystem
856 * @sc: the sc structure
857 *
858 * Returns: errno
859 */
860
gfs2_statfs_i(struct gfs2_sbd * sdp,struct gfs2_statfs_change_host * sc)861 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
862 {
863 struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
864 struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
865
866 spin_lock(&sdp->sd_statfs_spin);
867
868 *sc = *m_sc;
869 sc->sc_total += l_sc->sc_total;
870 sc->sc_free += l_sc->sc_free;
871 sc->sc_dinodes += l_sc->sc_dinodes;
872
873 spin_unlock(&sdp->sd_statfs_spin);
874
875 if (sc->sc_free < 0)
876 sc->sc_free = 0;
877 if (sc->sc_free > sc->sc_total)
878 sc->sc_free = sc->sc_total;
879 if (sc->sc_dinodes < 0)
880 sc->sc_dinodes = 0;
881
882 return 0;
883 }
884
885 /**
886 * gfs2_statfs - Gather and return stats about the filesystem
887 * @dentry: The name of the link
888 * @buf: The buffer
889 *
890 * Returns: 0 on success or error code
891 */
892
gfs2_statfs(struct dentry * dentry,struct kstatfs * buf)893 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
894 {
895 struct super_block *sb = dentry->d_sb;
896 struct gfs2_sbd *sdp = sb->s_fs_info;
897 struct gfs2_statfs_change_host sc;
898 int error;
899
900 error = gfs2_rindex_update(sdp);
901 if (error)
902 return error;
903
904 if (gfs2_tune_get(sdp, gt_statfs_slow))
905 error = gfs2_statfs_slow(sdp, &sc);
906 else
907 error = gfs2_statfs_i(sdp, &sc);
908
909 if (error)
910 return error;
911
912 buf->f_type = GFS2_MAGIC;
913 buf->f_bsize = sdp->sd_sb.sb_bsize;
914 buf->f_blocks = sc.sc_total;
915 buf->f_bfree = sc.sc_free;
916 buf->f_bavail = sc.sc_free;
917 buf->f_files = sc.sc_dinodes + sc.sc_free;
918 buf->f_ffree = sc.sc_free;
919 buf->f_namelen = GFS2_FNAMESIZE;
920
921 return 0;
922 }
923
924 /**
925 * gfs2_drop_inode - Drop an inode (test for remote unlink)
926 * @inode: The inode to drop
927 *
928 * If we've received a callback on an iopen lock then it's because a
929 * remote node tried to deallocate the inode but failed due to this node
930 * still having the inode open. Here we mark the link count zero
931 * since we know that it must have reached zero if the GLF_DEMOTE flag
932 * is set on the iopen glock. If we didn't do a disk read since the
933 * remote node removed the final link then we might otherwise miss
934 * this event. This check ensures that this node will deallocate the
935 * inode's blocks, or alternatively pass the baton on to another
936 * node for later deallocation.
937 */
938
gfs2_drop_inode(struct inode * inode)939 static int gfs2_drop_inode(struct inode *inode)
940 {
941 struct gfs2_inode *ip = GFS2_I(inode);
942 struct gfs2_sbd *sdp = GFS2_SB(inode);
943
944 if (inode->i_nlink &&
945 gfs2_holder_initialized(&ip->i_iopen_gh)) {
946 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
947 if (test_bit(GLF_DEMOTE, &gl->gl_flags))
948 clear_nlink(inode);
949 }
950
951 /*
952 * When under memory pressure when an inode's link count has dropped to
953 * zero, defer deleting the inode to the delete workqueue. This avoids
954 * calling into DLM under memory pressure, which can deadlock.
955 */
956 if (!inode->i_nlink &&
957 unlikely(current->flags & PF_MEMALLOC) &&
958 gfs2_holder_initialized(&ip->i_iopen_gh)) {
959 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
960
961 gfs2_glock_hold(gl);
962 if (!gfs2_queue_try_to_evict(gl))
963 gfs2_glock_queue_put(gl);
964 return 0;
965 }
966
967 /*
968 * No longer cache inodes when trying to evict them all.
969 */
970 if (test_bit(SDF_EVICTING, &sdp->sd_flags))
971 return 1;
972
973 return generic_drop_inode(inode);
974 }
975
is_ancestor(const struct dentry * d1,const struct dentry * d2)976 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
977 {
978 do {
979 if (d1 == d2)
980 return 1;
981 d1 = d1->d_parent;
982 } while (!IS_ROOT(d1));
983 return 0;
984 }
985
986 /**
987 * gfs2_show_options - Show mount options for /proc/mounts
988 * @s: seq_file structure
989 * @root: root of this (sub)tree
990 *
991 * Returns: 0 on success or error code
992 */
993
gfs2_show_options(struct seq_file * s,struct dentry * root)994 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
995 {
996 struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
997 struct gfs2_args *args = &sdp->sd_args;
998 int val;
999
1000 if (is_ancestor(root, sdp->sd_master_dir))
1001 seq_puts(s, ",meta");
1002 if (args->ar_lockproto[0])
1003 seq_show_option(s, "lockproto", args->ar_lockproto);
1004 if (args->ar_locktable[0])
1005 seq_show_option(s, "locktable", args->ar_locktable);
1006 if (args->ar_hostdata[0])
1007 seq_show_option(s, "hostdata", args->ar_hostdata);
1008 if (args->ar_spectator)
1009 seq_puts(s, ",spectator");
1010 if (args->ar_localflocks)
1011 seq_puts(s, ",localflocks");
1012 if (args->ar_debug)
1013 seq_puts(s, ",debug");
1014 if (args->ar_posix_acl)
1015 seq_puts(s, ",acl");
1016 if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1017 char *state;
1018 switch (args->ar_quota) {
1019 case GFS2_QUOTA_OFF:
1020 state = "off";
1021 break;
1022 case GFS2_QUOTA_ACCOUNT:
1023 state = "account";
1024 break;
1025 case GFS2_QUOTA_ON:
1026 state = "on";
1027 break;
1028 default:
1029 state = "unknown";
1030 break;
1031 }
1032 seq_printf(s, ",quota=%s", state);
1033 }
1034 if (args->ar_suiddir)
1035 seq_puts(s, ",suiddir");
1036 if (args->ar_data != GFS2_DATA_DEFAULT) {
1037 char *state;
1038 switch (args->ar_data) {
1039 case GFS2_DATA_WRITEBACK:
1040 state = "writeback";
1041 break;
1042 case GFS2_DATA_ORDERED:
1043 state = "ordered";
1044 break;
1045 default:
1046 state = "unknown";
1047 break;
1048 }
1049 seq_printf(s, ",data=%s", state);
1050 }
1051 if (args->ar_discard)
1052 seq_puts(s, ",discard");
1053 val = sdp->sd_tune.gt_logd_secs;
1054 if (val != 30)
1055 seq_printf(s, ",commit=%d", val);
1056 val = sdp->sd_tune.gt_statfs_quantum;
1057 if (val != 30)
1058 seq_printf(s, ",statfs_quantum=%d", val);
1059 else if (sdp->sd_tune.gt_statfs_slow)
1060 seq_puts(s, ",statfs_quantum=0");
1061 val = sdp->sd_tune.gt_quota_quantum;
1062 if (val != 60)
1063 seq_printf(s, ",quota_quantum=%d", val);
1064 if (args->ar_statfs_percent)
1065 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1066 if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1067 const char *state;
1068
1069 switch (args->ar_errors) {
1070 case GFS2_ERRORS_WITHDRAW:
1071 state = "withdraw";
1072 break;
1073 case GFS2_ERRORS_PANIC:
1074 state = "panic";
1075 break;
1076 default:
1077 state = "unknown";
1078 break;
1079 }
1080 seq_printf(s, ",errors=%s", state);
1081 }
1082 if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1083 seq_puts(s, ",nobarrier");
1084 if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1085 seq_puts(s, ",demote_interface_used");
1086 if (args->ar_rgrplvb)
1087 seq_puts(s, ",rgrplvb");
1088 if (args->ar_loccookie)
1089 seq_puts(s, ",loccookie");
1090 return 0;
1091 }
1092
gfs2_final_release_pages(struct gfs2_inode * ip)1093 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1094 {
1095 struct inode *inode = &ip->i_inode;
1096 struct gfs2_glock *gl = ip->i_gl;
1097
1098 if (unlikely(!gl)) {
1099 /* This can only happen during incomplete inode creation. */
1100 BUG_ON(!test_bit(GIF_ALLOC_FAILED, &ip->i_flags));
1101 return;
1102 }
1103
1104 truncate_inode_pages(gfs2_glock2aspace(gl), 0);
1105 truncate_inode_pages(&inode->i_data, 0);
1106
1107 if (atomic_read(&gl->gl_revokes) == 0) {
1108 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1109 clear_bit(GLF_DIRTY, &gl->gl_flags);
1110 }
1111 }
1112
gfs2_dinode_dealloc(struct gfs2_inode * ip)1113 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1114 {
1115 struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1116 struct gfs2_rgrpd *rgd;
1117 struct gfs2_holder gh;
1118 int error;
1119
1120 if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1121 gfs2_consist_inode(ip);
1122 return -EIO;
1123 }
1124
1125 error = gfs2_rindex_update(sdp);
1126 if (error)
1127 return error;
1128
1129 error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1130 if (error)
1131 return error;
1132
1133 rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1134 if (!rgd) {
1135 gfs2_consist_inode(ip);
1136 error = -EIO;
1137 goto out_qs;
1138 }
1139
1140 error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
1141 LM_FLAG_NODE_SCOPE, &gh);
1142 if (error)
1143 goto out_qs;
1144
1145 error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1146 sdp->sd_jdesc->jd_blocks);
1147 if (error)
1148 goto out_rg_gunlock;
1149
1150 gfs2_free_di(rgd, ip);
1151
1152 gfs2_final_release_pages(ip);
1153
1154 gfs2_trans_end(sdp);
1155
1156 out_rg_gunlock:
1157 gfs2_glock_dq_uninit(&gh);
1158 out_qs:
1159 gfs2_quota_unhold(ip);
1160 return error;
1161 }
1162
1163 /**
1164 * gfs2_glock_put_eventually
1165 * @gl: The glock to put
1166 *
1167 * When under memory pressure, trigger a deferred glock put to make sure we
1168 * won't call into DLM and deadlock. Otherwise, put the glock directly.
1169 */
1170
gfs2_glock_put_eventually(struct gfs2_glock * gl)1171 static void gfs2_glock_put_eventually(struct gfs2_glock *gl)
1172 {
1173 if (current->flags & PF_MEMALLOC)
1174 gfs2_glock_queue_put(gl);
1175 else
1176 gfs2_glock_put(gl);
1177 }
1178
gfs2_upgrade_iopen_glock(struct inode * inode)1179 static bool gfs2_upgrade_iopen_glock(struct inode *inode)
1180 {
1181 struct gfs2_inode *ip = GFS2_I(inode);
1182 struct gfs2_sbd *sdp = GFS2_SB(inode);
1183 struct gfs2_holder *gh = &ip->i_iopen_gh;
1184 long timeout = 5 * HZ;
1185 int error;
1186
1187 gh->gh_flags |= GL_NOCACHE;
1188 gfs2_glock_dq_wait(gh);
1189
1190 /*
1191 * If there are no other lock holders, we will immediately get
1192 * exclusive access to the iopen glock here.
1193 *
1194 * Otherwise, the other nodes holding the lock will be notified about
1195 * our locking request. If they do not have the inode open, they are
1196 * expected to evict the cached inode and release the lock, allowing us
1197 * to proceed.
1198 *
1199 * Otherwise, if they cannot evict the inode, they are expected to poke
1200 * the inode glock (note: not the iopen glock). We will notice that
1201 * and stop waiting for the iopen glock immediately. The other node(s)
1202 * are then expected to take care of deleting the inode when they no
1203 * longer use it.
1204 *
1205 * As a last resort, if another node keeps holding the iopen glock
1206 * without showing any activity on the inode glock, we will eventually
1207 * time out and fail the iopen glock upgrade.
1208 *
1209 * Note that we're passing the LM_FLAG_TRY_1CB flag to the first
1210 * locking request as an optimization to notify lock holders as soon as
1211 * possible. Without that flag, they'd be notified implicitly by the
1212 * second locking request.
1213 */
1214
1215 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, gh);
1216 error = gfs2_glock_nq(gh);
1217 if (error != GLR_TRYFAILED)
1218 return !error;
1219
1220 gfs2_holder_reinit(LM_ST_EXCLUSIVE, GL_ASYNC | GL_NOCACHE, gh);
1221 error = gfs2_glock_nq(gh);
1222 if (error)
1223 return false;
1224
1225 timeout = wait_event_interruptible_timeout(sdp->sd_async_glock_wait,
1226 !test_bit(HIF_WAIT, &gh->gh_iflags) ||
1227 test_bit(GLF_DEMOTE, &ip->i_gl->gl_flags),
1228 timeout);
1229 if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) {
1230 gfs2_glock_dq(gh);
1231 return false;
1232 }
1233 return gfs2_glock_holder_ready(gh) == 0;
1234 }
1235
1236 /**
1237 * evict_should_delete - determine whether the inode is eligible for deletion
1238 * @inode: The inode to evict
1239 * @gh: The glock holder structure
1240 *
1241 * This function determines whether the evicted inode is eligible to be deleted
1242 * and locks the inode glock.
1243 *
1244 * Returns: the fate of the dinode
1245 */
evict_should_delete(struct inode * inode,struct gfs2_holder * gh)1246 static enum dinode_demise evict_should_delete(struct inode *inode,
1247 struct gfs2_holder *gh)
1248 {
1249 struct gfs2_inode *ip = GFS2_I(inode);
1250 struct super_block *sb = inode->i_sb;
1251 struct gfs2_sbd *sdp = sb->s_fs_info;
1252 int ret;
1253
1254 if (unlikely(test_bit(GIF_ALLOC_FAILED, &ip->i_flags)))
1255 goto should_delete;
1256
1257 if (test_bit(GIF_DEFERRED_DELETE, &ip->i_flags))
1258 return SHOULD_DEFER_EVICTION;
1259
1260 /* Deletes should never happen under memory pressure anymore. */
1261 if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
1262 return SHOULD_DEFER_EVICTION;
1263
1264 /* Must not read inode block until block type has been verified */
1265 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, gh);
1266 if (unlikely(ret)) {
1267 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1268 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1269 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1270 return SHOULD_DEFER_EVICTION;
1271 }
1272
1273 if (gfs2_inode_already_deleted(ip->i_gl, ip->i_no_formal_ino))
1274 return SHOULD_NOT_DELETE_DINODE;
1275 ret = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1276 if (ret)
1277 return SHOULD_NOT_DELETE_DINODE;
1278
1279 ret = gfs2_instantiate(gh);
1280 if (ret)
1281 return SHOULD_NOT_DELETE_DINODE;
1282
1283 /*
1284 * The inode may have been recreated in the meantime.
1285 */
1286 if (inode->i_nlink)
1287 return SHOULD_NOT_DELETE_DINODE;
1288
1289 should_delete:
1290 if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
1291 test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1292 if (!gfs2_upgrade_iopen_glock(inode)) {
1293 gfs2_holder_uninit(&ip->i_iopen_gh);
1294 return SHOULD_NOT_DELETE_DINODE;
1295 }
1296 }
1297 return SHOULD_DELETE_DINODE;
1298 }
1299
1300 /**
1301 * evict_unlinked_inode - delete the pieces of an unlinked evicted inode
1302 * @inode: The inode to evict
1303 */
evict_unlinked_inode(struct inode * inode)1304 static int evict_unlinked_inode(struct inode *inode)
1305 {
1306 struct gfs2_inode *ip = GFS2_I(inode);
1307 int ret;
1308
1309 if (S_ISDIR(inode->i_mode) &&
1310 (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1311 ret = gfs2_dir_exhash_dealloc(ip);
1312 if (ret)
1313 goto out;
1314 }
1315
1316 if (ip->i_eattr) {
1317 ret = gfs2_ea_dealloc(ip);
1318 if (ret)
1319 goto out;
1320 }
1321
1322 if (!gfs2_is_stuffed(ip)) {
1323 ret = gfs2_file_dealloc(ip);
1324 if (ret)
1325 goto out;
1326 }
1327
1328 if (ip->i_gl)
1329 gfs2_inode_remember_delete(ip->i_gl, ip->i_no_formal_ino);
1330
1331 /*
1332 * As soon as we clear the bitmap for the dinode, gfs2_create_inode()
1333 * can get called to recreate it, or even gfs2_inode_lookup() if the
1334 * inode was recreated on another node in the meantime.
1335 *
1336 * However, inserting the new inode into the inode hash table will not
1337 * succeed until the old inode is removed, and that only happens after
1338 * ->evict_inode() returns. The new inode is attached to its inode and
1339 * iopen glocks after inserting it into the inode hash table, so at
1340 * that point we can be sure that both glocks are unused.
1341 */
1342
1343 ret = gfs2_dinode_dealloc(ip);
1344 out:
1345 return ret;
1346 }
1347
1348 /*
1349 * evict_linked_inode - evict an inode whose dinode has not been unlinked
1350 * @inode: The inode to evict
1351 */
evict_linked_inode(struct inode * inode)1352 static int evict_linked_inode(struct inode *inode)
1353 {
1354 struct super_block *sb = inode->i_sb;
1355 struct gfs2_sbd *sdp = sb->s_fs_info;
1356 struct gfs2_inode *ip = GFS2_I(inode);
1357 struct address_space *metamapping;
1358 int ret;
1359
1360 gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
1361 GFS2_LFC_EVICT_INODE);
1362 metamapping = gfs2_glock2aspace(ip->i_gl);
1363 if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1364 filemap_fdatawrite(metamapping);
1365 filemap_fdatawait(metamapping);
1366 }
1367 write_inode_now(inode, 1);
1368 gfs2_ail_flush(ip->i_gl, 0);
1369
1370 ret = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1371 if (ret)
1372 return ret;
1373
1374 /* Needs to be done before glock release & also in a transaction */
1375 truncate_inode_pages(&inode->i_data, 0);
1376 truncate_inode_pages(metamapping, 0);
1377 gfs2_trans_end(sdp);
1378 return 0;
1379 }
1380
1381 /**
1382 * gfs2_evict_inode - Remove an inode from cache
1383 * @inode: The inode to evict
1384 *
1385 * There are three cases to consider:
1386 * 1. i_nlink == 0, we are final opener (and must deallocate)
1387 * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1388 * 3. i_nlink > 0
1389 *
1390 * If the fs is read only, then we have to treat all cases as per #3
1391 * since we are unable to do any deallocation. The inode will be
1392 * deallocated by the next read/write node to attempt an allocation
1393 * in the same resource group
1394 *
1395 * We have to (at the moment) hold the inodes main lock to cover
1396 * the gap between unlocking the shared lock on the iopen lock and
1397 * taking the exclusive lock. I'd rather do a shared -> exclusive
1398 * conversion on the iopen lock, but we can change that later. This
1399 * is safe, just less efficient.
1400 */
1401
gfs2_evict_inode(struct inode * inode)1402 static void gfs2_evict_inode(struct inode *inode)
1403 {
1404 struct super_block *sb = inode->i_sb;
1405 struct gfs2_sbd *sdp = sb->s_fs_info;
1406 struct gfs2_inode *ip = GFS2_I(inode);
1407 struct gfs2_holder gh;
1408 int ret;
1409
1410 if (inode->i_nlink || sb_rdonly(sb) || !ip->i_no_addr)
1411 goto out;
1412
1413 gfs2_holder_mark_uninitialized(&gh);
1414 ret = evict_should_delete(inode, &gh);
1415 if (ret == SHOULD_DEFER_EVICTION)
1416 goto out;
1417 if (ret == SHOULD_DELETE_DINODE)
1418 ret = evict_unlinked_inode(inode);
1419 else
1420 ret = evict_linked_inode(inode);
1421
1422 if (gfs2_rs_active(&ip->i_res))
1423 gfs2_rs_deltree(&ip->i_res);
1424
1425 if (gfs2_holder_initialized(&gh))
1426 gfs2_glock_dq_uninit(&gh);
1427 if (ret && ret != GLR_TRYFAILED && ret != -EROFS)
1428 fs_warn(sdp, "gfs2_evict_inode: %d\n", ret);
1429 out:
1430 truncate_inode_pages_final(&inode->i_data);
1431 if (ip->i_qadata)
1432 gfs2_assert_warn(sdp, ip->i_qadata->qa_ref == 0);
1433 gfs2_rs_deltree(&ip->i_res);
1434 gfs2_ordered_del_inode(ip);
1435 clear_inode(inode);
1436 gfs2_dir_hash_inval(ip);
1437 if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1438 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1439
1440 glock_clear_object(gl, ip);
1441 gfs2_glock_hold(gl);
1442 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1443 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1444 gfs2_glock_put_eventually(gl);
1445 }
1446 if (ip->i_gl) {
1447 glock_clear_object(ip->i_gl, ip);
1448 wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
1449 gfs2_glock_add_to_lru(ip->i_gl);
1450 gfs2_glock_put_eventually(ip->i_gl);
1451 ip->i_gl = NULL;
1452 }
1453 }
1454
gfs2_alloc_inode(struct super_block * sb)1455 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1456 {
1457 struct gfs2_inode *ip;
1458
1459 ip = alloc_inode_sb(sb, gfs2_inode_cachep, GFP_KERNEL);
1460 if (!ip)
1461 return NULL;
1462 ip->i_no_addr = 0;
1463 ip->i_flags = 0;
1464 ip->i_gl = NULL;
1465 gfs2_holder_mark_uninitialized(&ip->i_iopen_gh);
1466 memset(&ip->i_res, 0, sizeof(ip->i_res));
1467 RB_CLEAR_NODE(&ip->i_res.rs_node);
1468 ip->i_rahead = 0;
1469 return &ip->i_inode;
1470 }
1471
gfs2_free_inode(struct inode * inode)1472 static void gfs2_free_inode(struct inode *inode)
1473 {
1474 kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode));
1475 }
1476
free_local_statfs_inodes(struct gfs2_sbd * sdp)1477 extern void free_local_statfs_inodes(struct gfs2_sbd *sdp)
1478 {
1479 struct local_statfs_inode *lsi, *safe;
1480
1481 /* Run through the statfs inodes list to iput and free memory */
1482 list_for_each_entry_safe(lsi, safe, &sdp->sd_sc_inodes_list, si_list) {
1483 if (lsi->si_jid == sdp->sd_jdesc->jd_jid)
1484 sdp->sd_sc_inode = NULL; /* belongs to this node */
1485 if (lsi->si_sc_inode)
1486 iput(lsi->si_sc_inode);
1487 list_del(&lsi->si_list);
1488 kfree(lsi);
1489 }
1490 }
1491
find_local_statfs_inode(struct gfs2_sbd * sdp,unsigned int index)1492 extern struct inode *find_local_statfs_inode(struct gfs2_sbd *sdp,
1493 unsigned int index)
1494 {
1495 struct local_statfs_inode *lsi;
1496
1497 /* Return the local (per node) statfs inode in the
1498 * sdp->sd_sc_inodes_list corresponding to the 'index'. */
1499 list_for_each_entry(lsi, &sdp->sd_sc_inodes_list, si_list) {
1500 if (lsi->si_jid == index)
1501 return lsi->si_sc_inode;
1502 }
1503 return NULL;
1504 }
1505
1506 const struct super_operations gfs2_super_ops = {
1507 .alloc_inode = gfs2_alloc_inode,
1508 .free_inode = gfs2_free_inode,
1509 .write_inode = gfs2_write_inode,
1510 .dirty_inode = gfs2_dirty_inode,
1511 .evict_inode = gfs2_evict_inode,
1512 .put_super = gfs2_put_super,
1513 .sync_fs = gfs2_sync_fs,
1514 .freeze_super = gfs2_freeze,
1515 .thaw_super = gfs2_unfreeze,
1516 .statfs = gfs2_statfs,
1517 .drop_inode = gfs2_drop_inode,
1518 .show_options = gfs2_show_options,
1519 };
1520
1521