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TOMOYO Linux Cross Reference
Linux/fs/gfs2/super.c

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  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 
 85         list_for_each_entry(jd, head, jd_list) {
 86                 if (jd->jd_jid == jid)
 87                         return jd;
 88         }
 89         return NULL;
 90 }
 91 
 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 
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 static int init_threads(struct gfs2_sbd *sdp)
123 {
124         struct task_struct *p;
125         int error = 0;
126 
127         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
128         if (IS_ERR(p)) {
129                 error = PTR_ERR(p);
130                 fs_err(sdp, "can't start logd thread: %d\n", error);
131                 return error;
132         }
133         sdp->sd_logd_process = p;
134 
135         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
136         if (IS_ERR(p)) {
137                 error = PTR_ERR(p);
138                 fs_err(sdp, "can't start quotad thread: %d\n", error);
139                 goto fail;
140         }
141         sdp->sd_quotad_process = p;
142         return 0;
143 
144 fail:
145         kthread_stop(sdp->sd_logd_process);
146         sdp->sd_logd_process = NULL;
147         return error;
148 }
149 
150 /**
151  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
152  * @sdp: the filesystem
153  *
154  * Returns: errno
155  */
156 
157 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
158 {
159         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
160         struct gfs2_glock *j_gl = ip->i_gl;
161         struct gfs2_log_header_host head;
162         int error;
163 
164         error = init_threads(sdp);
165         if (error) {
166                 gfs2_withdraw_delayed(sdp);
167                 return error;
168         }
169 
170         j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
171         if (gfs2_withdrawn(sdp)) {
172                 error = -EIO;
173                 goto fail;
174         }
175 
176         error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
177         if (error || gfs2_withdrawn(sdp))
178                 goto fail;
179 
180         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
181                 gfs2_consist(sdp);
182                 error = -EIO;
183                 goto fail;
184         }
185 
186         /*  Initialize some head of the log stuff  */
187         sdp->sd_log_sequence = head.lh_sequence + 1;
188         gfs2_log_pointers_init(sdp, head.lh_blkno);
189 
190         error = gfs2_quota_init(sdp);
191         if (error || gfs2_withdrawn(sdp))
192                 goto fail;
193 
194         set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
195 
196         return 0;
197 
198 fail:
199         if (sdp->sd_quotad_process)
200                 kthread_stop(sdp->sd_quotad_process);
201         sdp->sd_quotad_process = NULL;
202         if (sdp->sd_logd_process)
203                 kthread_stop(sdp->sd_logd_process);
204         sdp->sd_logd_process = NULL;
205         return error;
206 }
207 
208 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
209 {
210         const struct gfs2_statfs_change *str = buf;
211 
212         sc->sc_total = be64_to_cpu(str->sc_total);
213         sc->sc_free = be64_to_cpu(str->sc_free);
214         sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
215 }
216 
217 void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
218 {
219         struct gfs2_statfs_change *str = buf;
220 
221         str->sc_total = cpu_to_be64(sc->sc_total);
222         str->sc_free = cpu_to_be64(sc->sc_free);
223         str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
224 }
225 
226 int gfs2_statfs_init(struct gfs2_sbd *sdp)
227 {
228         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
229         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
230         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
231         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
232         struct buffer_head *m_bh, *l_bh;
233         struct gfs2_holder gh;
234         int error;
235 
236         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
237                                    &gh);
238         if (error)
239                 return error;
240 
241         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
242         if (error)
243                 goto out;
244 
245         if (sdp->sd_args.ar_spectator) {
246                 spin_lock(&sdp->sd_statfs_spin);
247                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
248                                       sizeof(struct gfs2_dinode));
249                 spin_unlock(&sdp->sd_statfs_spin);
250         } else {
251                 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
252                 if (error)
253                         goto out_m_bh;
254 
255                 spin_lock(&sdp->sd_statfs_spin);
256                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
257                                       sizeof(struct gfs2_dinode));
258                 gfs2_statfs_change_in(l_sc, l_bh->b_data +
259                                       sizeof(struct gfs2_dinode));
260                 spin_unlock(&sdp->sd_statfs_spin);
261 
262                 brelse(l_bh);
263         }
264 
265 out_m_bh:
266         brelse(m_bh);
267 out:
268         gfs2_glock_dq_uninit(&gh);
269         return 0;
270 }
271 
272 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
273                         s64 dinodes)
274 {
275         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
276         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
277         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
278         struct buffer_head *l_bh;
279         s64 x, y;
280         int need_sync = 0;
281         int error;
282 
283         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
284         if (error)
285                 return;
286 
287         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
288 
289         spin_lock(&sdp->sd_statfs_spin);
290         l_sc->sc_total += total;
291         l_sc->sc_free += free;
292         l_sc->sc_dinodes += dinodes;
293         gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
294         if (sdp->sd_args.ar_statfs_percent) {
295                 x = 100 * l_sc->sc_free;
296                 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
297                 if (x >= y || x <= -y)
298                         need_sync = 1;
299         }
300         spin_unlock(&sdp->sd_statfs_spin);
301 
302         brelse(l_bh);
303         if (need_sync)
304                 gfs2_wake_up_statfs(sdp);
305 }
306 
307 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
308                    struct buffer_head *l_bh)
309 {
310         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
311         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
312         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
313         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
314 
315         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
316         gfs2_trans_add_meta(m_ip->i_gl, m_bh);
317 
318         spin_lock(&sdp->sd_statfs_spin);
319         m_sc->sc_total += l_sc->sc_total;
320         m_sc->sc_free += l_sc->sc_free;
321         m_sc->sc_dinodes += l_sc->sc_dinodes;
322         memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
323         memset(l_bh->b_data + sizeof(struct gfs2_dinode),
324                0, sizeof(struct gfs2_statfs_change));
325         gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
326         spin_unlock(&sdp->sd_statfs_spin);
327 }
328 
329 int gfs2_statfs_sync(struct super_block *sb, int type)
330 {
331         struct gfs2_sbd *sdp = sb->s_fs_info;
332         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
333         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
334         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
335         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
336         struct gfs2_holder gh;
337         struct buffer_head *m_bh, *l_bh;
338         int error;
339 
340         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
341                                    &gh);
342         if (error)
343                 goto out;
344 
345         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
346         if (error)
347                 goto out_unlock;
348 
349         spin_lock(&sdp->sd_statfs_spin);
350         gfs2_statfs_change_in(m_sc, m_bh->b_data +
351                               sizeof(struct gfs2_dinode));
352         if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
353                 spin_unlock(&sdp->sd_statfs_spin);
354                 goto out_bh;
355         }
356         spin_unlock(&sdp->sd_statfs_spin);
357 
358         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
359         if (error)
360                 goto out_bh;
361 
362         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
363         if (error)
364                 goto out_bh2;
365 
366         update_statfs(sdp, m_bh, l_bh);
367         sdp->sd_statfs_force_sync = 0;
368 
369         gfs2_trans_end(sdp);
370 
371 out_bh2:
372         brelse(l_bh);
373 out_bh:
374         brelse(m_bh);
375 out_unlock:
376         gfs2_glock_dq_uninit(&gh);
377 out:
378         return error;
379 }
380 
381 struct lfcc {
382         struct list_head list;
383         struct gfs2_holder gh;
384 };
385 
386 /**
387  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
388  *                            journals are clean
389  * @sdp: the file system
390  *
391  * Returns: errno
392  */
393 
394 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp)
395 {
396         struct gfs2_inode *ip;
397         struct gfs2_jdesc *jd;
398         struct lfcc *lfcc;
399         LIST_HEAD(list);
400         struct gfs2_log_header_host lh;
401         int error;
402 
403         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
404                 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
405                 if (!lfcc) {
406                         error = -ENOMEM;
407                         goto out;
408                 }
409                 ip = GFS2_I(jd->jd_inode);
410                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
411                 if (error) {
412                         kfree(lfcc);
413                         goto out;
414                 }
415                 list_add(&lfcc->list, &list);
416         }
417 
418         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
419                                    LM_FLAG_NOEXP, &sdp->sd_freeze_gh);
420         if (error)
421                 goto out;
422 
423         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
424                 error = gfs2_jdesc_check(jd);
425                 if (error)
426                         break;
427                 error = gfs2_find_jhead(jd, &lh, false);
428                 if (error)
429                         break;
430                 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
431                         error = -EBUSY;
432                         break;
433                 }
434         }
435 
436         if (error)
437                 gfs2_freeze_unlock(&sdp->sd_freeze_gh);
438 
439 out:
440         while (!list_empty(&list)) {
441                 lfcc = list_first_entry(&list, struct lfcc, list);
442                 list_del(&lfcc->list);
443                 gfs2_glock_dq_uninit(&lfcc->gh);
444                 kfree(lfcc);
445         }
446         return error;
447 }
448 
449 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
450 {
451         struct gfs2_dinode *str = buf;
452 
453         str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
454         str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
455         str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
456         str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
457         str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
458         str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
459         str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
460         str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
461         str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
462         str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
463         str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
464         str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
465         str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
466         str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
467 
468         str->di_goal_meta = cpu_to_be64(ip->i_goal);
469         str->di_goal_data = cpu_to_be64(ip->i_goal);
470         str->di_generation = cpu_to_be64(ip->i_generation);
471 
472         str->di_flags = cpu_to_be32(ip->i_diskflags);
473         str->di_height = cpu_to_be16(ip->i_height);
474         str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
475                                              !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
476                                              GFS2_FORMAT_DE : 0);
477         str->di_depth = cpu_to_be16(ip->i_depth);
478         str->di_entries = cpu_to_be32(ip->i_entries);
479 
480         str->di_eattr = cpu_to_be64(ip->i_eattr);
481         str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
482         str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
483         str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
484 }
485 
486 /**
487  * gfs2_write_inode - Make sure the inode is stable on the disk
488  * @inode: The inode
489  * @wbc: The writeback control structure
490  *
491  * Returns: errno
492  */
493 
494 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
495 {
496         struct gfs2_inode *ip = GFS2_I(inode);
497         struct gfs2_sbd *sdp = GFS2_SB(inode);
498         struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
499         struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
500         int ret = 0;
501         bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
502 
503         if (flush_all)
504                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl,
505                                GFS2_LOG_HEAD_FLUSH_NORMAL |
506                                GFS2_LFC_WRITE_INODE);
507         if (bdi->wb.dirty_exceeded)
508                 gfs2_ail1_flush(sdp, wbc);
509         else
510                 filemap_fdatawrite(metamapping);
511         if (flush_all)
512                 ret = filemap_fdatawait(metamapping);
513         if (ret)
514                 mark_inode_dirty_sync(inode);
515         else {
516                 spin_lock(&inode->i_lock);
517                 if (!(inode->i_flags & I_DIRTY))
518                         gfs2_ordered_del_inode(ip);
519                 spin_unlock(&inode->i_lock);
520         }
521         return ret;
522 }
523 
524 /**
525  * gfs2_dirty_inode - check for atime updates
526  * @inode: The inode in question
527  * @flags: The type of dirty
528  *
529  * Unfortunately it can be called under any combination of inode
530  * glock and transaction lock, so we have to check carefully.
531  *
532  * At the moment this deals only with atime - it should be possible
533  * to expand that role in future, once a review of the locking has
534  * been carried out.
535  */
536 
537 static void gfs2_dirty_inode(struct inode *inode, int flags)
538 {
539         struct gfs2_inode *ip = GFS2_I(inode);
540         struct gfs2_sbd *sdp = GFS2_SB(inode);
541         struct buffer_head *bh;
542         struct gfs2_holder gh;
543         int need_unlock = 0;
544         int need_endtrans = 0;
545         int ret;
546 
547         if (unlikely(gfs2_withdrawn(sdp)))
548                 return;
549         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
550                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
551                 if (ret) {
552                         fs_err(sdp, "dirty_inode: glock %d\n", ret);
553                         gfs2_dump_glock(NULL, ip->i_gl, true);
554                         return;
555                 }
556                 need_unlock = 1;
557         } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
558                 return;
559 
560         if (current->journal_info == NULL) {
561                 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
562                 if (ret) {
563                         fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
564                         goto out;
565                 }
566                 need_endtrans = 1;
567         }
568 
569         ret = gfs2_meta_inode_buffer(ip, &bh);
570         if (ret == 0) {
571                 gfs2_trans_add_meta(ip->i_gl, bh);
572                 gfs2_dinode_out(ip, bh->b_data);
573                 brelse(bh);
574         }
575 
576         if (need_endtrans)
577                 gfs2_trans_end(sdp);
578 out:
579         if (need_unlock)
580                 gfs2_glock_dq_uninit(&gh);
581 }
582 
583 /**
584  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
585  * @sdp: the filesystem
586  *
587  * Returns: errno
588  */
589 
590 void gfs2_make_fs_ro(struct gfs2_sbd *sdp)
591 {
592         int log_write_allowed = test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
593 
594         gfs2_flush_delete_work(sdp);
595         if (!log_write_allowed && current == sdp->sd_quotad_process)
596                 fs_warn(sdp, "The quotad daemon is withdrawing.\n");
597         else if (sdp->sd_quotad_process)
598                 kthread_stop(sdp->sd_quotad_process);
599         sdp->sd_quotad_process = NULL;
600 
601         if (!log_write_allowed && current == sdp->sd_logd_process)
602                 fs_warn(sdp, "The logd daemon is withdrawing.\n");
603         else if (sdp->sd_logd_process)
604                 kthread_stop(sdp->sd_logd_process);
605         sdp->sd_logd_process = NULL;
606 
607         if (log_write_allowed) {
608                 gfs2_quota_sync(sdp->sd_vfs, 0);
609                 gfs2_statfs_sync(sdp->sd_vfs, 0);
610 
611                 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
612                                GFS2_LFC_MAKE_FS_RO);
613                 wait_event_timeout(sdp->sd_log_waitq,
614                                    gfs2_log_is_empty(sdp),
615                                    HZ * 5);
616                 gfs2_assert_warn(sdp, gfs2_log_is_empty(sdp));
617         } else {
618                 wait_event_timeout(sdp->sd_log_waitq,
619                                    gfs2_log_is_empty(sdp),
620                                    HZ * 5);
621         }
622         gfs2_quota_cleanup(sdp);
623 
624         if (!log_write_allowed)
625                 sdp->sd_vfs->s_flags |= SB_RDONLY;
626 }
627 
628 /**
629  * gfs2_put_super - Unmount the filesystem
630  * @sb: The VFS superblock
631  *
632  */
633 
634 static void gfs2_put_super(struct super_block *sb)
635 {
636         struct gfs2_sbd *sdp = sb->s_fs_info;
637         struct gfs2_jdesc *jd;
638 
639         /* No more recovery requests */
640         set_bit(SDF_NORECOVERY, &sdp->sd_flags);
641         smp_mb();
642 
643         /* Wait on outstanding recovery */
644 restart:
645         spin_lock(&sdp->sd_jindex_spin);
646         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
647                 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
648                         continue;
649                 spin_unlock(&sdp->sd_jindex_spin);
650                 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
651                             TASK_UNINTERRUPTIBLE);
652                 goto restart;
653         }
654         spin_unlock(&sdp->sd_jindex_spin);
655 
656         if (!sb_rdonly(sb)) {
657                 gfs2_make_fs_ro(sdp);
658         }
659         WARN_ON(gfs2_withdrawing(sdp));
660 
661         /*  At this point, we're through modifying the disk  */
662 
663         /*  Release stuff  */
664 
665         iput(sdp->sd_jindex);
666         iput(sdp->sd_statfs_inode);
667         iput(sdp->sd_rindex);
668         iput(sdp->sd_quota_inode);
669 
670         gfs2_glock_put(sdp->sd_rename_gl);
671         gfs2_glock_put(sdp->sd_freeze_gl);
672 
673         if (!sdp->sd_args.ar_spectator) {
674                 if (gfs2_holder_initialized(&sdp->sd_journal_gh))
675                         gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
676                 if (gfs2_holder_initialized(&sdp->sd_jinode_gh))
677                         gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
678                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
679                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
680                 free_local_statfs_inodes(sdp);
681                 iput(sdp->sd_qc_inode);
682         }
683 
684         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
685         gfs2_clear_rgrpd(sdp);
686         gfs2_jindex_free(sdp);
687         /*  Take apart glock structures and buffer lists  */
688         gfs2_gl_hash_clear(sdp);
689         truncate_inode_pages_final(&sdp->sd_aspace);
690         gfs2_delete_debugfs_file(sdp);
691         /*  Unmount the locking protocol  */
692         gfs2_lm_unmount(sdp);
693 
694         /*  At this point, we're through participating in the lockspace  */
695         gfs2_sys_fs_del(sdp);
696         free_sbd(sdp);
697 }
698 
699 /**
700  * gfs2_sync_fs - sync the filesystem
701  * @sb: the superblock
702  * @wait: true to wait for completion
703  *
704  * Flushes the log to disk.
705  */
706 
707 static int gfs2_sync_fs(struct super_block *sb, int wait)
708 {
709         struct gfs2_sbd *sdp = sb->s_fs_info;
710 
711         gfs2_quota_sync(sb, -1);
712         if (wait)
713                 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
714                                GFS2_LFC_SYNC_FS);
715         return sdp->sd_log_error;
716 }
717 
718 void gfs2_freeze_func(struct work_struct *work)
719 {
720         int error;
721         struct gfs2_holder freeze_gh;
722         struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
723         struct super_block *sb = sdp->sd_vfs;
724 
725         atomic_inc(&sb->s_active);
726         error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
727         if (error) {
728                 gfs2_assert_withdraw(sdp, 0);
729         } else {
730                 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
731                 error = thaw_super(sb);
732                 if (error) {
733                         fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n",
734                                 error);
735                         gfs2_assert_withdraw(sdp, 0);
736                 }
737                 gfs2_freeze_unlock(&freeze_gh);
738         }
739         deactivate_super(sb);
740         clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags);
741         wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN);
742         return;
743 }
744 
745 /**
746  * gfs2_freeze - prevent further writes to the filesystem
747  * @sb: the VFS structure for the filesystem
748  *
749  */
750 
751 static int gfs2_freeze(struct super_block *sb)
752 {
753         struct gfs2_sbd *sdp = sb->s_fs_info;
754         int error;
755 
756         mutex_lock(&sdp->sd_freeze_mutex);
757         if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN) {
758                 error = -EBUSY;
759                 goto out;
760         }
761 
762         for (;;) {
763                 if (gfs2_withdrawn(sdp)) {
764                         error = -EINVAL;
765                         goto out;
766                 }
767 
768                 error = gfs2_lock_fs_check_clean(sdp);
769                 if (!error)
770                         break;
771 
772                 if (error == -EBUSY)
773                         fs_err(sdp, "waiting for recovery before freeze\n");
774                 else if (error == -EIO) {
775                         fs_err(sdp, "Fatal IO error: cannot freeze gfs2 due "
776                                "to recovery error.\n");
777                         goto out;
778                 } else {
779                         fs_err(sdp, "error freezing FS: %d\n", error);
780                 }
781                 fs_err(sdp, "retrying...\n");
782                 msleep(1000);
783         }
784         set_bit(SDF_FS_FROZEN, &sdp->sd_flags);
785 out:
786         mutex_unlock(&sdp->sd_freeze_mutex);
787         return error;
788 }
789 
790 /**
791  * gfs2_unfreeze - reallow writes to the filesystem
792  * @sb: the VFS structure for the filesystem
793  *
794  */
795 
796 static int gfs2_unfreeze(struct super_block *sb)
797 {
798         struct gfs2_sbd *sdp = sb->s_fs_info;
799 
800         mutex_lock(&sdp->sd_freeze_mutex);
801         if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
802             !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
803                 mutex_unlock(&sdp->sd_freeze_mutex);
804                 return -EINVAL;
805         }
806 
807         gfs2_freeze_unlock(&sdp->sd_freeze_gh);
808         mutex_unlock(&sdp->sd_freeze_mutex);
809         return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE);
810 }
811 
812 /**
813  * statfs_slow_fill - fill in the sg for a given RG
814  * @rgd: the RG
815  * @sc: the sc structure
816  *
817  * Returns: 0 on success, -ESTALE if the LVB is invalid
818  */
819 
820 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
821                             struct gfs2_statfs_change_host *sc)
822 {
823         gfs2_rgrp_verify(rgd);
824         sc->sc_total += rgd->rd_data;
825         sc->sc_free += rgd->rd_free;
826         sc->sc_dinodes += rgd->rd_dinodes;
827         return 0;
828 }
829 
830 /**
831  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
832  * @sdp: the filesystem
833  * @sc: the sc info that will be returned
834  *
835  * Any error (other than a signal) will cause this routine to fall back
836  * to the synchronous version.
837  *
838  * FIXME: This really shouldn't busy wait like this.
839  *
840  * Returns: errno
841  */
842 
843 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
844 {
845         struct gfs2_rgrpd *rgd_next;
846         struct gfs2_holder *gha, *gh;
847         unsigned int slots = 64;
848         unsigned int x;
849         int done;
850         int error = 0, err;
851 
852         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
853         gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
854         if (!gha)
855                 return -ENOMEM;
856         for (x = 0; x < slots; x++)
857                 gfs2_holder_mark_uninitialized(gha + x);
858 
859         rgd_next = gfs2_rgrpd_get_first(sdp);
860 
861         for (;;) {
862                 done = 1;
863 
864                 for (x = 0; x < slots; x++) {
865                         gh = gha + x;
866 
867                         if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
868                                 err = gfs2_glock_wait(gh);
869                                 if (err) {
870                                         gfs2_holder_uninit(gh);
871                                         error = err;
872                                 } else {
873                                         if (!error) {
874                                                 struct gfs2_rgrpd *rgd =
875                                                         gfs2_glock2rgrp(gh->gh_gl);
876 
877                                                 error = statfs_slow_fill(rgd, sc);
878                                         }
879                                         gfs2_glock_dq_uninit(gh);
880                                 }
881                         }
882 
883                         if (gfs2_holder_initialized(gh))
884                                 done = 0;
885                         else if (rgd_next && !error) {
886                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
887                                                            LM_ST_SHARED,
888                                                            GL_ASYNC,
889                                                            gh);
890                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
891                                 done = 0;
892                         }
893 
894                         if (signal_pending(current))
895                                 error = -ERESTARTSYS;
896                 }
897 
898                 if (done)
899                         break;
900 
901                 yield();
902         }
903 
904         kfree(gha);
905         return error;
906 }
907 
908 /**
909  * gfs2_statfs_i - Do a statfs
910  * @sdp: the filesystem
911  * @sc: the sc structure
912  *
913  * Returns: errno
914  */
915 
916 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
917 {
918         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
919         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
920 
921         spin_lock(&sdp->sd_statfs_spin);
922 
923         *sc = *m_sc;
924         sc->sc_total += l_sc->sc_total;
925         sc->sc_free += l_sc->sc_free;
926         sc->sc_dinodes += l_sc->sc_dinodes;
927 
928         spin_unlock(&sdp->sd_statfs_spin);
929 
930         if (sc->sc_free < 0)
931                 sc->sc_free = 0;
932         if (sc->sc_free > sc->sc_total)
933                 sc->sc_free = sc->sc_total;
934         if (sc->sc_dinodes < 0)
935                 sc->sc_dinodes = 0;
936 
937         return 0;
938 }
939 
940 /**
941  * gfs2_statfs - Gather and return stats about the filesystem
942  * @dentry: The name of the link
943  * @buf: The buffer
944  *
945  * Returns: 0 on success or error code
946  */
947 
948 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
949 {
950         struct super_block *sb = dentry->d_sb;
951         struct gfs2_sbd *sdp = sb->s_fs_info;
952         struct gfs2_statfs_change_host sc;
953         int error;
954 
955         error = gfs2_rindex_update(sdp);
956         if (error)
957                 return error;
958 
959         if (gfs2_tune_get(sdp, gt_statfs_slow))
960                 error = gfs2_statfs_slow(sdp, &sc);
961         else
962                 error = gfs2_statfs_i(sdp, &sc);
963 
964         if (error)
965                 return error;
966 
967         buf->f_type = GFS2_MAGIC;
968         buf->f_bsize = sdp->sd_sb.sb_bsize;
969         buf->f_blocks = sc.sc_total;
970         buf->f_bfree = sc.sc_free;
971         buf->f_bavail = sc.sc_free;
972         buf->f_files = sc.sc_dinodes + sc.sc_free;
973         buf->f_ffree = sc.sc_free;
974         buf->f_namelen = GFS2_FNAMESIZE;
975 
976         return 0;
977 }
978 
979 /**
980  * gfs2_drop_inode - Drop an inode (test for remote unlink)
981  * @inode: The inode to drop
982  *
983  * If we've received a callback on an iopen lock then it's because a
984  * remote node tried to deallocate the inode but failed due to this node
985  * still having the inode open. Here we mark the link count zero
986  * since we know that it must have reached zero if the GLF_DEMOTE flag
987  * is set on the iopen glock. If we didn't do a disk read since the
988  * remote node removed the final link then we might otherwise miss
989  * this event. This check ensures that this node will deallocate the
990  * inode's blocks, or alternatively pass the baton on to another
991  * node for later deallocation.
992  */
993 
994 static int gfs2_drop_inode(struct inode *inode)
995 {
996         struct gfs2_inode *ip = GFS2_I(inode);
997 
998         if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
999             inode->i_nlink &&
1000             gfs2_holder_initialized(&ip->i_iopen_gh)) {
1001                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1002                 if (test_bit(GLF_DEMOTE, &gl->gl_flags))
1003                         clear_nlink(inode);
1004         }
1005 
1006         /*
1007          * When under memory pressure when an inode's link count has dropped to
1008          * zero, defer deleting the inode to the delete workqueue.  This avoids
1009          * calling into DLM under memory pressure, which can deadlock.
1010          */
1011         if (!inode->i_nlink &&
1012             unlikely(current->flags & PF_MEMALLOC) &&
1013             gfs2_holder_initialized(&ip->i_iopen_gh)) {
1014                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1015 
1016                 gfs2_glock_hold(gl);
1017                 if (!gfs2_queue_delete_work(gl, 0))
1018                         gfs2_glock_queue_put(gl);
1019                 return false;
1020         }
1021 
1022         return generic_drop_inode(inode);
1023 }
1024 
1025 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1026 {
1027         do {
1028                 if (d1 == d2)
1029                         return 1;
1030                 d1 = d1->d_parent;
1031         } while (!IS_ROOT(d1));
1032         return 0;
1033 }
1034 
1035 /**
1036  * gfs2_show_options - Show mount options for /proc/mounts
1037  * @s: seq_file structure
1038  * @root: root of this (sub)tree
1039  *
1040  * Returns: 0 on success or error code
1041  */
1042 
1043 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1044 {
1045         struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1046         struct gfs2_args *args = &sdp->sd_args;
1047         int val;
1048 
1049         if (is_ancestor(root, sdp->sd_master_dir))
1050                 seq_puts(s, ",meta");
1051         if (args->ar_lockproto[0])
1052                 seq_show_option(s, "lockproto", args->ar_lockproto);
1053         if (args->ar_locktable[0])
1054                 seq_show_option(s, "locktable", args->ar_locktable);
1055         if (args->ar_hostdata[0])
1056                 seq_show_option(s, "hostdata", args->ar_hostdata);
1057         if (args->ar_spectator)
1058                 seq_puts(s, ",spectator");
1059         if (args->ar_localflocks)
1060                 seq_puts(s, ",localflocks");
1061         if (args->ar_debug)
1062                 seq_puts(s, ",debug");
1063         if (args->ar_posix_acl)
1064                 seq_puts(s, ",acl");
1065         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1066                 char *state;
1067                 switch (args->ar_quota) {
1068                 case GFS2_QUOTA_OFF:
1069                         state = "off";
1070                         break;
1071                 case GFS2_QUOTA_ACCOUNT:
1072                         state = "account";
1073                         break;
1074                 case GFS2_QUOTA_ON:
1075                         state = "on";
1076                         break;
1077                 default:
1078                         state = "unknown";
1079                         break;
1080                 }
1081                 seq_printf(s, ",quota=%s", state);
1082         }
1083         if (args->ar_suiddir)
1084                 seq_puts(s, ",suiddir");
1085         if (args->ar_data != GFS2_DATA_DEFAULT) {
1086                 char *state;
1087                 switch (args->ar_data) {
1088                 case GFS2_DATA_WRITEBACK:
1089                         state = "writeback";
1090                         break;
1091                 case GFS2_DATA_ORDERED:
1092                         state = "ordered";
1093                         break;
1094                 default:
1095                         state = "unknown";
1096                         break;
1097                 }
1098                 seq_printf(s, ",data=%s", state);
1099         }
1100         if (args->ar_discard)
1101                 seq_puts(s, ",discard");
1102         val = sdp->sd_tune.gt_logd_secs;
1103         if (val != 30)
1104                 seq_printf(s, ",commit=%d", val);
1105         val = sdp->sd_tune.gt_statfs_quantum;
1106         if (val != 30)
1107                 seq_printf(s, ",statfs_quantum=%d", val);
1108         else if (sdp->sd_tune.gt_statfs_slow)
1109                 seq_puts(s, ",statfs_quantum=0");
1110         val = sdp->sd_tune.gt_quota_quantum;
1111         if (val != 60)
1112                 seq_printf(s, ",quota_quantum=%d", val);
1113         if (args->ar_statfs_percent)
1114                 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1115         if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1116                 const char *state;
1117 
1118                 switch (args->ar_errors) {
1119                 case GFS2_ERRORS_WITHDRAW:
1120                         state = "withdraw";
1121                         break;
1122                 case GFS2_ERRORS_PANIC:
1123                         state = "panic";
1124                         break;
1125                 default:
1126                         state = "unknown";
1127                         break;
1128                 }
1129                 seq_printf(s, ",errors=%s", state);
1130         }
1131         if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1132                 seq_puts(s, ",nobarrier");
1133         if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1134                 seq_puts(s, ",demote_interface_used");
1135         if (args->ar_rgrplvb)
1136                 seq_puts(s, ",rgrplvb");
1137         if (args->ar_loccookie)
1138                 seq_puts(s, ",loccookie");
1139         return 0;
1140 }
1141 
1142 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1143 {
1144         struct inode *inode = &ip->i_inode;
1145         struct gfs2_glock *gl = ip->i_gl;
1146 
1147         truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1148         truncate_inode_pages(&inode->i_data, 0);
1149 
1150         if (atomic_read(&gl->gl_revokes) == 0) {
1151                 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1152                 clear_bit(GLF_DIRTY, &gl->gl_flags);
1153         }
1154 }
1155 
1156 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1157 {
1158         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1159         struct gfs2_rgrpd *rgd;
1160         struct gfs2_holder gh;
1161         int error;
1162 
1163         if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1164                 gfs2_consist_inode(ip);
1165                 return -EIO;
1166         }
1167 
1168         error = gfs2_rindex_update(sdp);
1169         if (error)
1170                 return error;
1171 
1172         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1173         if (error)
1174                 return error;
1175 
1176         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1177         if (!rgd) {
1178                 gfs2_consist_inode(ip);
1179                 error = -EIO;
1180                 goto out_qs;
1181         }
1182 
1183         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE,
1184                                    LM_FLAG_NODE_SCOPE, &gh);
1185         if (error)
1186                 goto out_qs;
1187 
1188         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1189                                  sdp->sd_jdesc->jd_blocks);
1190         if (error)
1191                 goto out_rg_gunlock;
1192 
1193         gfs2_free_di(rgd, ip);
1194 
1195         gfs2_final_release_pages(ip);
1196 
1197         gfs2_trans_end(sdp);
1198 
1199 out_rg_gunlock:
1200         gfs2_glock_dq_uninit(&gh);
1201 out_qs:
1202         gfs2_quota_unhold(ip);
1203         return error;
1204 }
1205 
1206 /**
1207  * gfs2_glock_put_eventually
1208  * @gl: The glock to put
1209  *
1210  * When under memory pressure, trigger a deferred glock put to make sure we
1211  * won't call into DLM and deadlock.  Otherwise, put the glock directly.
1212  */
1213 
1214 static void gfs2_glock_put_eventually(struct gfs2_glock *gl)
1215 {
1216         if (current->flags & PF_MEMALLOC)
1217                 gfs2_glock_queue_put(gl);
1218         else
1219                 gfs2_glock_put(gl);
1220 }
1221 
1222 static bool gfs2_upgrade_iopen_glock(struct inode *inode)
1223 {
1224         struct gfs2_inode *ip = GFS2_I(inode);
1225         struct gfs2_sbd *sdp = GFS2_SB(inode);
1226         struct gfs2_holder *gh = &ip->i_iopen_gh;
1227         long timeout = 5 * HZ;
1228         int error;
1229 
1230         gh->gh_flags |= GL_NOCACHE;
1231         gfs2_glock_dq_wait(gh);
1232 
1233         /*
1234          * If there are no other lock holders, we'll get the lock immediately.
1235          * Otherwise, the other nodes holding the lock will be notified about
1236          * our locking request.  If they don't have the inode open, they'll
1237          * evict the cached inode and release the lock.  Otherwise, if they
1238          * poke the inode glock, we'll take this as an indication that they
1239          * still need the iopen glock and that they'll take care of deleting
1240          * the inode when they're done.  As a last resort, if another node
1241          * keeps holding the iopen glock without showing any activity on the
1242          * inode glock, we'll eventually time out.
1243          *
1244          * Note that we're passing the LM_FLAG_TRY_1CB flag to the first
1245          * locking request as an optimization to notify lock holders as soon as
1246          * possible.  Without that flag, they'd be notified implicitly by the
1247          * second locking request.
1248          */
1249 
1250         gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE, gh);
1251         error = gfs2_glock_nq(gh);
1252         if (error != GLR_TRYFAILED)
1253                 return !error;
1254 
1255         gfs2_holder_reinit(LM_ST_EXCLUSIVE, GL_ASYNC | GL_NOCACHE, gh);
1256         error = gfs2_glock_nq(gh);
1257         if (error)
1258                 return false;
1259 
1260         timeout = wait_event_interruptible_timeout(sdp->sd_async_glock_wait,
1261                 !test_bit(HIF_WAIT, &gh->gh_iflags) ||
1262                 test_bit(GLF_DEMOTE, &ip->i_gl->gl_flags),
1263                 timeout);
1264         if (!test_bit(HIF_HOLDER, &gh->gh_iflags)) {
1265                 gfs2_glock_dq(gh);
1266                 return false;
1267         }
1268         return true;
1269 }
1270 
1271 /**
1272  * evict_should_delete - determine whether the inode is eligible for deletion
1273  * @inode: The inode to evict
1274  * @gh: The glock holder structure
1275  *
1276  * This function determines whether the evicted inode is eligible to be deleted
1277  * and locks the inode glock.
1278  *
1279  * Returns: the fate of the dinode
1280  */
1281 static enum dinode_demise evict_should_delete(struct inode *inode,
1282                                               struct gfs2_holder *gh)
1283 {
1284         struct gfs2_inode *ip = GFS2_I(inode);
1285         struct super_block *sb = inode->i_sb;
1286         struct gfs2_sbd *sdp = sb->s_fs_info;
1287         int ret;
1288 
1289         if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1290                 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
1291                 goto should_delete;
1292         }
1293 
1294         if (test_bit(GIF_DEFERRED_DELETE, &ip->i_flags))
1295                 return SHOULD_DEFER_EVICTION;
1296 
1297         /* Deletes should never happen under memory pressure anymore.  */
1298         if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
1299                 return SHOULD_DEFER_EVICTION;
1300 
1301         /* Must not read inode block until block type has been verified */
1302         ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, gh);
1303         if (unlikely(ret)) {
1304                 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1305                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1306                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1307                 return SHOULD_DEFER_EVICTION;
1308         }
1309 
1310         if (gfs2_inode_already_deleted(ip->i_gl, ip->i_no_formal_ino))
1311                 return SHOULD_NOT_DELETE_DINODE;
1312         ret = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1313         if (ret)
1314                 return SHOULD_NOT_DELETE_DINODE;
1315 
1316         if (test_bit(GIF_INVALID, &ip->i_flags)) {
1317                 ret = gfs2_inode_refresh(ip);
1318                 if (ret)
1319                         return SHOULD_NOT_DELETE_DINODE;
1320         }
1321 
1322         /*
1323          * The inode may have been recreated in the meantime.
1324          */
1325         if (inode->i_nlink)
1326                 return SHOULD_NOT_DELETE_DINODE;
1327 
1328 should_delete:
1329         if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
1330             test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1331                 if (!gfs2_upgrade_iopen_glock(inode)) {
1332                         gfs2_holder_uninit(&ip->i_iopen_gh);
1333                         return SHOULD_NOT_DELETE_DINODE;
1334                 }
1335         }
1336         return SHOULD_DELETE_DINODE;
1337 }
1338 
1339 /**
1340  * evict_unlinked_inode - delete the pieces of an unlinked evicted inode
1341  * @inode: The inode to evict
1342  */
1343 static int evict_unlinked_inode(struct inode *inode)
1344 {
1345         struct gfs2_inode *ip = GFS2_I(inode);
1346         int ret;
1347 
1348         if (S_ISDIR(inode->i_mode) &&
1349             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1350                 ret = gfs2_dir_exhash_dealloc(ip);
1351                 if (ret)
1352                         goto out;
1353         }
1354 
1355         if (ip->i_eattr) {
1356                 ret = gfs2_ea_dealloc(ip);
1357                 if (ret)
1358                         goto out;
1359         }
1360 
1361         if (!gfs2_is_stuffed(ip)) {
1362                 ret = gfs2_file_dealloc(ip);
1363                 if (ret)
1364                         goto out;
1365         }
1366 
1367         /* We're about to clear the bitmap for the dinode, but as soon as we
1368            do, gfs2_create_inode can create another inode at the same block
1369            location and try to set gl_object again. We clear gl_object here so
1370            that subsequent inode creates don't see an old gl_object. */
1371         glock_clear_object(ip->i_gl, ip);
1372         ret = gfs2_dinode_dealloc(ip);
1373         gfs2_inode_remember_delete(ip->i_gl, ip->i_no_formal_ino);
1374 out:
1375         return ret;
1376 }
1377 
1378 /*
1379  * evict_linked_inode - evict an inode whose dinode has not been unlinked
1380  * @inode: The inode to evict
1381  */
1382 static int evict_linked_inode(struct inode *inode)
1383 {
1384         struct super_block *sb = inode->i_sb;
1385         struct gfs2_sbd *sdp = sb->s_fs_info;
1386         struct gfs2_inode *ip = GFS2_I(inode);
1387         struct address_space *metamapping;
1388         int ret;
1389 
1390         gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
1391                        GFS2_LFC_EVICT_INODE);
1392         metamapping = gfs2_glock2aspace(ip->i_gl);
1393         if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1394                 filemap_fdatawrite(metamapping);
1395                 filemap_fdatawait(metamapping);
1396         }
1397         write_inode_now(inode, 1);
1398         gfs2_ail_flush(ip->i_gl, 0);
1399 
1400         ret = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1401         if (ret)
1402                 return ret;
1403 
1404         /* Needs to be done before glock release & also in a transaction */
1405         truncate_inode_pages(&inode->i_data, 0);
1406         truncate_inode_pages(metamapping, 0);
1407         gfs2_trans_end(sdp);
1408         return 0;
1409 }
1410 
1411 /**
1412  * gfs2_evict_inode - Remove an inode from cache
1413  * @inode: The inode to evict
1414  *
1415  * There are three cases to consider:
1416  * 1. i_nlink == 0, we are final opener (and must deallocate)
1417  * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1418  * 3. i_nlink > 0
1419  *
1420  * If the fs is read only, then we have to treat all cases as per #3
1421  * since we are unable to do any deallocation. The inode will be
1422  * deallocated by the next read/write node to attempt an allocation
1423  * in the same resource group
1424  *
1425  * We have to (at the moment) hold the inodes main lock to cover
1426  * the gap between unlocking the shared lock on the iopen lock and
1427  * taking the exclusive lock. I'd rather do a shared -> exclusive
1428  * conversion on the iopen lock, but we can change that later. This
1429  * is safe, just less efficient.
1430  */
1431 
1432 static void gfs2_evict_inode(struct inode *inode)
1433 {
1434         struct super_block *sb = inode->i_sb;
1435         struct gfs2_sbd *sdp = sb->s_fs_info;
1436         struct gfs2_inode *ip = GFS2_I(inode);
1437         struct gfs2_holder gh;
1438         int ret;
1439 
1440         if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1441                 clear_inode(inode);
1442                 return;
1443         }
1444 
1445         if (inode->i_nlink || sb_rdonly(sb))
1446                 goto out;
1447 
1448         gfs2_holder_mark_uninitialized(&gh);
1449         ret = evict_should_delete(inode, &gh);
1450         if (ret == SHOULD_DEFER_EVICTION)
1451                 goto out;
1452         if (ret == SHOULD_DELETE_DINODE)
1453                 ret = evict_unlinked_inode(inode);
1454         else
1455                 ret = evict_linked_inode(inode);
1456 
1457         if (gfs2_rs_active(&ip->i_res))
1458                 gfs2_rs_deltree(&ip->i_res);
1459 
1460         if (gfs2_holder_initialized(&gh)) {
1461                 glock_clear_object(ip->i_gl, ip);
1462                 gfs2_glock_dq_uninit(&gh);
1463         }
1464         if (ret && ret != GLR_TRYFAILED && ret != -EROFS)
1465                 fs_warn(sdp, "gfs2_evict_inode: %d\n", ret);
1466 out:
1467         truncate_inode_pages_final(&inode->i_data);
1468         if (ip->i_qadata)
1469                 gfs2_assert_warn(sdp, ip->i_qadata->qa_ref == 0);
1470         gfs2_rs_delete(ip, NULL);
1471         gfs2_ordered_del_inode(ip);
1472         clear_inode(inode);
1473         gfs2_dir_hash_inval(ip);
1474         if (ip->i_gl) {
1475                 glock_clear_object(ip->i_gl, ip);
1476                 wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
1477                 gfs2_glock_add_to_lru(ip->i_gl);
1478                 gfs2_glock_put_eventually(ip->i_gl);
1479                 ip->i_gl = NULL;
1480         }
1481         if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1482                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1483 
1484                 glock_clear_object(gl, ip);
1485                 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1486                         ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1487                         gfs2_glock_dq(&ip->i_iopen_gh);
1488                 }
1489                 gfs2_glock_hold(gl);
1490                 gfs2_holder_uninit(&ip->i_iopen_gh);
1491                 gfs2_glock_put_eventually(gl);
1492         }
1493 }
1494 
1495 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1496 {
1497         struct gfs2_inode *ip;
1498 
1499         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1500         if (!ip)
1501                 return NULL;
1502         ip->i_flags = 0;
1503         ip->i_gl = NULL;
1504         gfs2_holder_mark_uninitialized(&ip->i_iopen_gh);
1505         memset(&ip->i_res, 0, sizeof(ip->i_res));
1506         RB_CLEAR_NODE(&ip->i_res.rs_node);
1507         ip->i_rahead = 0;
1508         return &ip->i_inode;
1509 }
1510 
1511 static void gfs2_free_inode(struct inode *inode)
1512 {
1513         kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode));
1514 }
1515 
1516 extern void free_local_statfs_inodes(struct gfs2_sbd *sdp)
1517 {
1518         struct local_statfs_inode *lsi, *safe;
1519 
1520         /* Run through the statfs inodes list to iput and free memory */
1521         list_for_each_entry_safe(lsi, safe, &sdp->sd_sc_inodes_list, si_list) {
1522                 if (lsi->si_jid == sdp->sd_jdesc->jd_jid)
1523                         sdp->sd_sc_inode = NULL; /* belongs to this node */
1524                 if (lsi->si_sc_inode)
1525                         iput(lsi->si_sc_inode);
1526                 list_del(&lsi->si_list);
1527                 kfree(lsi);
1528         }
1529 }
1530 
1531 extern struct inode *find_local_statfs_inode(struct gfs2_sbd *sdp,
1532                                              unsigned int index)
1533 {
1534         struct local_statfs_inode *lsi;
1535 
1536         /* Return the local (per node) statfs inode in the
1537          * sdp->sd_sc_inodes_list corresponding to the 'index'. */
1538         list_for_each_entry(lsi, &sdp->sd_sc_inodes_list, si_list) {
1539                 if (lsi->si_jid == index)
1540                         return lsi->si_sc_inode;
1541         }
1542         return NULL;
1543 }
1544 
1545 const struct super_operations gfs2_super_ops = {
1546         .alloc_inode            = gfs2_alloc_inode,
1547         .free_inode             = gfs2_free_inode,
1548         .write_inode            = gfs2_write_inode,
1549         .dirty_inode            = gfs2_dirty_inode,
1550         .evict_inode            = gfs2_evict_inode,
1551         .put_super              = gfs2_put_super,
1552         .sync_fs                = gfs2_sync_fs,
1553         .freeze_super           = gfs2_freeze,
1554         .thaw_super             = gfs2_unfreeze,
1555         .statfs                 = gfs2_statfs,
1556         .drop_inode             = gfs2_drop_inode,
1557         .show_options           = gfs2_show_options,
1558 };
1559 
1560 

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