~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.15-rc5 ] ~ [ linux-5.14.11 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.72 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.152 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.210 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.250 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.286 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.288 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 // SPDX-License-Identifier: GPL-2.0-only
  2 /*
  3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
  4  * Copyright (C) 2004-2007 Red Hat, Inc.  All rights reserved.
  5  */
  6 
  7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
  8 
  9 #include <linux/bio.h>
 10 #include <linux/sched/signal.h>
 11 #include <linux/slab.h>
 12 #include <linux/spinlock.h>
 13 #include <linux/completion.h>
 14 #include <linux/buffer_head.h>
 15 #include <linux/statfs.h>
 16 #include <linux/seq_file.h>
 17 #include <linux/mount.h>
 18 #include <linux/kthread.h>
 19 #include <linux/delay.h>
 20 #include <linux/gfs2_ondisk.h>
 21 #include <linux/crc32.h>
 22 #include <linux/time.h>
 23 #include <linux/wait.h>
 24 #include <linux/writeback.h>
 25 #include <linux/backing-dev.h>
 26 #include <linux/kernel.h>
 27 
 28 #include "gfs2.h"
 29 #include "incore.h"
 30 #include "bmap.h"
 31 #include "dir.h"
 32 #include "glock.h"
 33 #include "glops.h"
 34 #include "inode.h"
 35 #include "log.h"
 36 #include "meta_io.h"
 37 #include "quota.h"
 38 #include "recovery.h"
 39 #include "rgrp.h"
 40 #include "super.h"
 41 #include "trans.h"
 42 #include "util.h"
 43 #include "sys.h"
 44 #include "xattr.h"
 45 #include "lops.h"
 46 
 47 /**
 48  * gfs2_jindex_free - Clear all the journal index information
 49  * @sdp: The GFS2 superblock
 50  *
 51  */
 52 
 53 void gfs2_jindex_free(struct gfs2_sbd *sdp)
 54 {
 55         struct list_head list;
 56         struct gfs2_jdesc *jd;
 57 
 58         spin_lock(&sdp->sd_jindex_spin);
 59         list_add(&list, &sdp->sd_jindex_list);
 60         list_del_init(&sdp->sd_jindex_list);
 61         sdp->sd_journals = 0;
 62         spin_unlock(&sdp->sd_jindex_spin);
 63 
 64         while (!list_empty(&list)) {
 65                 jd = list_entry(list.next, struct gfs2_jdesc, jd_list);
 66                 gfs2_free_journal_extents(jd);
 67                 list_del(&jd->jd_list);
 68                 iput(jd->jd_inode);
 69                 kfree(jd);
 70         }
 71 }
 72 
 73 static struct gfs2_jdesc *jdesc_find_i(struct list_head *head, unsigned int jid)
 74 {
 75         struct gfs2_jdesc *jd;
 76         int found = 0;
 77 
 78         list_for_each_entry(jd, head, jd_list) {
 79                 if (jd->jd_jid == jid) {
 80                         found = 1;
 81                         break;
 82                 }
 83         }
 84 
 85         if (!found)
 86                 jd = NULL;
 87 
 88         return jd;
 89 }
 90 
 91 struct gfs2_jdesc *gfs2_jdesc_find(struct gfs2_sbd *sdp, unsigned int jid)
 92 {
 93         struct gfs2_jdesc *jd;
 94 
 95         spin_lock(&sdp->sd_jindex_spin);
 96         jd = jdesc_find_i(&sdp->sd_jindex_list, jid);
 97         spin_unlock(&sdp->sd_jindex_spin);
 98 
 99         return jd;
100 }
101 
102 int gfs2_jdesc_check(struct gfs2_jdesc *jd)
103 {
104         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
105         struct gfs2_sbd *sdp = GFS2_SB(jd->jd_inode);
106         u64 size = i_size_read(jd->jd_inode);
107 
108         if (gfs2_check_internal_file_size(jd->jd_inode, 8 << 20, BIT(30)))
109                 return -EIO;
110 
111         jd->jd_blocks = size >> sdp->sd_sb.sb_bsize_shift;
112 
113         if (gfs2_write_alloc_required(ip, 0, size)) {
114                 gfs2_consist_inode(ip);
115                 return -EIO;
116         }
117 
118         return 0;
119 }
120 
121 static int init_threads(struct gfs2_sbd *sdp)
122 {
123         struct task_struct *p;
124         int error = 0;
125 
126         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
127         if (IS_ERR(p)) {
128                 error = PTR_ERR(p);
129                 fs_err(sdp, "can't start logd thread: %d\n", error);
130                 return error;
131         }
132         sdp->sd_logd_process = p;
133 
134         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
135         if (IS_ERR(p)) {
136                 error = PTR_ERR(p);
137                 fs_err(sdp, "can't start quotad thread: %d\n", error);
138                 goto fail;
139         }
140         sdp->sd_quotad_process = p;
141         return 0;
142 
143 fail:
144         kthread_stop(sdp->sd_logd_process);
145         sdp->sd_logd_process = NULL;
146         return error;
147 }
148 
149 /**
150  * gfs2_make_fs_rw - Turn a Read-Only FS into a Read-Write one
151  * @sdp: the filesystem
152  *
153  * Returns: errno
154  */
155 
156 int gfs2_make_fs_rw(struct gfs2_sbd *sdp)
157 {
158         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
159         struct gfs2_glock *j_gl = ip->i_gl;
160         struct gfs2_holder freeze_gh;
161         struct gfs2_log_header_host head;
162         int error;
163 
164         error = init_threads(sdp);
165         if (error)
166                 return error;
167 
168         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
169                                    &freeze_gh);
170         if (error)
171                 goto fail_threads;
172 
173         j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
174 
175         error = gfs2_find_jhead(sdp->sd_jdesc, &head, false);
176         if (error)
177                 goto fail;
178 
179         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
180                 gfs2_consist(sdp);
181                 error = -EIO;
182                 goto fail;
183         }
184 
185         /*  Initialize some head of the log stuff  */
186         sdp->sd_log_sequence = head.lh_sequence + 1;
187         gfs2_log_pointers_init(sdp, head.lh_blkno);
188 
189         error = gfs2_quota_init(sdp);
190         if (error)
191                 goto fail;
192 
193         set_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags);
194 
195         gfs2_glock_dq_uninit(&freeze_gh);
196 
197         return 0;
198 
199 fail:
200         freeze_gh.gh_flags |= GL_NOCACHE;
201         gfs2_glock_dq_uninit(&freeze_gh);
202 fail_threads:
203         if (sdp->sd_quotad_process)
204                 kthread_stop(sdp->sd_quotad_process);
205         sdp->sd_quotad_process = NULL;
206         if (sdp->sd_logd_process)
207                 kthread_stop(sdp->sd_logd_process);
208         sdp->sd_logd_process = NULL;
209         return error;
210 }
211 
212 void gfs2_statfs_change_in(struct gfs2_statfs_change_host *sc, const void *buf)
213 {
214         const struct gfs2_statfs_change *str = buf;
215 
216         sc->sc_total = be64_to_cpu(str->sc_total);
217         sc->sc_free = be64_to_cpu(str->sc_free);
218         sc->sc_dinodes = be64_to_cpu(str->sc_dinodes);
219 }
220 
221 static void gfs2_statfs_change_out(const struct gfs2_statfs_change_host *sc, void *buf)
222 {
223         struct gfs2_statfs_change *str = buf;
224 
225         str->sc_total = cpu_to_be64(sc->sc_total);
226         str->sc_free = cpu_to_be64(sc->sc_free);
227         str->sc_dinodes = cpu_to_be64(sc->sc_dinodes);
228 }
229 
230 int gfs2_statfs_init(struct gfs2_sbd *sdp)
231 {
232         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
233         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
234         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
235         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
236         struct buffer_head *m_bh, *l_bh;
237         struct gfs2_holder gh;
238         int error;
239 
240         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
241                                    &gh);
242         if (error)
243                 return error;
244 
245         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
246         if (error)
247                 goto out;
248 
249         if (sdp->sd_args.ar_spectator) {
250                 spin_lock(&sdp->sd_statfs_spin);
251                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
252                                       sizeof(struct gfs2_dinode));
253                 spin_unlock(&sdp->sd_statfs_spin);
254         } else {
255                 error = gfs2_meta_inode_buffer(l_ip, &l_bh);
256                 if (error)
257                         goto out_m_bh;
258 
259                 spin_lock(&sdp->sd_statfs_spin);
260                 gfs2_statfs_change_in(m_sc, m_bh->b_data +
261                                       sizeof(struct gfs2_dinode));
262                 gfs2_statfs_change_in(l_sc, l_bh->b_data +
263                                       sizeof(struct gfs2_dinode));
264                 spin_unlock(&sdp->sd_statfs_spin);
265 
266                 brelse(l_bh);
267         }
268 
269 out_m_bh:
270         brelse(m_bh);
271 out:
272         gfs2_glock_dq_uninit(&gh);
273         return 0;
274 }
275 
276 void gfs2_statfs_change(struct gfs2_sbd *sdp, s64 total, s64 free,
277                         s64 dinodes)
278 {
279         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
280         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
281         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
282         struct buffer_head *l_bh;
283         s64 x, y;
284         int need_sync = 0;
285         int error;
286 
287         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
288         if (error)
289                 return;
290 
291         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
292 
293         spin_lock(&sdp->sd_statfs_spin);
294         l_sc->sc_total += total;
295         l_sc->sc_free += free;
296         l_sc->sc_dinodes += dinodes;
297         gfs2_statfs_change_out(l_sc, l_bh->b_data + sizeof(struct gfs2_dinode));
298         if (sdp->sd_args.ar_statfs_percent) {
299                 x = 100 * l_sc->sc_free;
300                 y = m_sc->sc_free * sdp->sd_args.ar_statfs_percent;
301                 if (x >= y || x <= -y)
302                         need_sync = 1;
303         }
304         spin_unlock(&sdp->sd_statfs_spin);
305 
306         brelse(l_bh);
307         if (need_sync)
308                 gfs2_wake_up_statfs(sdp);
309 }
310 
311 void update_statfs(struct gfs2_sbd *sdp, struct buffer_head *m_bh,
312                    struct buffer_head *l_bh)
313 {
314         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
315         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
316         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
317         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
318 
319         gfs2_trans_add_meta(l_ip->i_gl, l_bh);
320         gfs2_trans_add_meta(m_ip->i_gl, m_bh);
321 
322         spin_lock(&sdp->sd_statfs_spin);
323         m_sc->sc_total += l_sc->sc_total;
324         m_sc->sc_free += l_sc->sc_free;
325         m_sc->sc_dinodes += l_sc->sc_dinodes;
326         memset(l_sc, 0, sizeof(struct gfs2_statfs_change));
327         memset(l_bh->b_data + sizeof(struct gfs2_dinode),
328                0, sizeof(struct gfs2_statfs_change));
329         gfs2_statfs_change_out(m_sc, m_bh->b_data + sizeof(struct gfs2_dinode));
330         spin_unlock(&sdp->sd_statfs_spin);
331 }
332 
333 int gfs2_statfs_sync(struct super_block *sb, int type)
334 {
335         struct gfs2_sbd *sdp = sb->s_fs_info;
336         struct gfs2_inode *m_ip = GFS2_I(sdp->sd_statfs_inode);
337         struct gfs2_inode *l_ip = GFS2_I(sdp->sd_sc_inode);
338         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
339         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
340         struct gfs2_holder gh;
341         struct buffer_head *m_bh, *l_bh;
342         int error;
343 
344         sb_start_write(sb);
345         error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, GL_NOCACHE,
346                                    &gh);
347         if (error)
348                 goto out;
349 
350         error = gfs2_meta_inode_buffer(m_ip, &m_bh);
351         if (error)
352                 goto out_unlock;
353 
354         spin_lock(&sdp->sd_statfs_spin);
355         gfs2_statfs_change_in(m_sc, m_bh->b_data +
356                               sizeof(struct gfs2_dinode));
357         if (!l_sc->sc_total && !l_sc->sc_free && !l_sc->sc_dinodes) {
358                 spin_unlock(&sdp->sd_statfs_spin);
359                 goto out_bh;
360         }
361         spin_unlock(&sdp->sd_statfs_spin);
362 
363         error = gfs2_meta_inode_buffer(l_ip, &l_bh);
364         if (error)
365                 goto out_bh;
366 
367         error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0);
368         if (error)
369                 goto out_bh2;
370 
371         update_statfs(sdp, m_bh, l_bh);
372         sdp->sd_statfs_force_sync = 0;
373 
374         gfs2_trans_end(sdp);
375 
376 out_bh2:
377         brelse(l_bh);
378 out_bh:
379         brelse(m_bh);
380 out_unlock:
381         gfs2_glock_dq_uninit(&gh);
382 out:
383         sb_end_write(sb);
384         return error;
385 }
386 
387 struct lfcc {
388         struct list_head list;
389         struct gfs2_holder gh;
390 };
391 
392 /**
393  * gfs2_lock_fs_check_clean - Stop all writes to the FS and check that all
394  *                            journals are clean
395  * @sdp: the file system
396  * @state: the state to put the transaction lock into
397  * @t_gh: the hold on the transaction lock
398  *
399  * Returns: errno
400  */
401 
402 static int gfs2_lock_fs_check_clean(struct gfs2_sbd *sdp)
403 {
404         struct gfs2_inode *ip;
405         struct gfs2_jdesc *jd;
406         struct lfcc *lfcc;
407         LIST_HEAD(list);
408         struct gfs2_log_header_host lh;
409         int error;
410 
411         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
412                 lfcc = kmalloc(sizeof(struct lfcc), GFP_KERNEL);
413                 if (!lfcc) {
414                         error = -ENOMEM;
415                         goto out;
416                 }
417                 ip = GFS2_I(jd->jd_inode);
418                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &lfcc->gh);
419                 if (error) {
420                         kfree(lfcc);
421                         goto out;
422                 }
423                 list_add(&lfcc->list, &list);
424         }
425 
426         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_EXCLUSIVE,
427                                    GL_NOCACHE, &sdp->sd_freeze_gh);
428         if (error)
429                 goto out;
430 
431         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
432                 error = gfs2_jdesc_check(jd);
433                 if (error)
434                         break;
435                 error = gfs2_find_jhead(jd, &lh, false);
436                 if (error)
437                         break;
438                 if (!(lh.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
439                         error = -EBUSY;
440                         break;
441                 }
442         }
443 
444         if (error)
445                 gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
446 
447 out:
448         while (!list_empty(&list)) {
449                 lfcc = list_entry(list.next, struct lfcc, list);
450                 list_del(&lfcc->list);
451                 gfs2_glock_dq_uninit(&lfcc->gh);
452                 kfree(lfcc);
453         }
454         return error;
455 }
456 
457 void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf)
458 {
459         struct gfs2_dinode *str = buf;
460 
461         str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC);
462         str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI);
463         str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI);
464         str->di_num.no_addr = cpu_to_be64(ip->i_no_addr);
465         str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino);
466         str->di_mode = cpu_to_be32(ip->i_inode.i_mode);
467         str->di_uid = cpu_to_be32(i_uid_read(&ip->i_inode));
468         str->di_gid = cpu_to_be32(i_gid_read(&ip->i_inode));
469         str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink);
470         str->di_size = cpu_to_be64(i_size_read(&ip->i_inode));
471         str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode));
472         str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec);
473         str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec);
474         str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec);
475 
476         str->di_goal_meta = cpu_to_be64(ip->i_goal);
477         str->di_goal_data = cpu_to_be64(ip->i_goal);
478         str->di_generation = cpu_to_be64(ip->i_generation);
479 
480         str->di_flags = cpu_to_be32(ip->i_diskflags);
481         str->di_height = cpu_to_be16(ip->i_height);
482         str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) &&
483                                              !(ip->i_diskflags & GFS2_DIF_EXHASH) ?
484                                              GFS2_FORMAT_DE : 0);
485         str->di_depth = cpu_to_be16(ip->i_depth);
486         str->di_entries = cpu_to_be32(ip->i_entries);
487 
488         str->di_eattr = cpu_to_be64(ip->i_eattr);
489         str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec);
490         str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec);
491         str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec);
492 }
493 
494 /**
495  * gfs2_write_inode - Make sure the inode is stable on the disk
496  * @inode: The inode
497  * @wbc: The writeback control structure
498  *
499  * Returns: errno
500  */
501 
502 static int gfs2_write_inode(struct inode *inode, struct writeback_control *wbc)
503 {
504         struct gfs2_inode *ip = GFS2_I(inode);
505         struct gfs2_sbd *sdp = GFS2_SB(inode);
506         struct address_space *metamapping = gfs2_glock2aspace(ip->i_gl);
507         struct backing_dev_info *bdi = inode_to_bdi(metamapping->host);
508         int ret = 0;
509         bool flush_all = (wbc->sync_mode == WB_SYNC_ALL || gfs2_is_jdata(ip));
510 
511         if (flush_all)
512                 gfs2_log_flush(GFS2_SB(inode), ip->i_gl,
513                                GFS2_LOG_HEAD_FLUSH_NORMAL |
514                                GFS2_LFC_WRITE_INODE);
515         if (bdi->wb.dirty_exceeded)
516                 gfs2_ail1_flush(sdp, wbc);
517         else
518                 filemap_fdatawrite(metamapping);
519         if (flush_all)
520                 ret = filemap_fdatawait(metamapping);
521         if (ret)
522                 mark_inode_dirty_sync(inode);
523         else {
524                 spin_lock(&inode->i_lock);
525                 if (!(inode->i_flags & I_DIRTY))
526                         gfs2_ordered_del_inode(ip);
527                 spin_unlock(&inode->i_lock);
528         }
529         return ret;
530 }
531 
532 /**
533  * gfs2_dirty_inode - check for atime updates
534  * @inode: The inode in question
535  * @flags: The type of dirty
536  *
537  * Unfortunately it can be called under any combination of inode
538  * glock and transaction lock, so we have to check carefully.
539  *
540  * At the moment this deals only with atime - it should be possible
541  * to expand that role in future, once a review of the locking has
542  * been carried out.
543  */
544 
545 static void gfs2_dirty_inode(struct inode *inode, int flags)
546 {
547         struct gfs2_inode *ip = GFS2_I(inode);
548         struct gfs2_sbd *sdp = GFS2_SB(inode);
549         struct buffer_head *bh;
550         struct gfs2_holder gh;
551         int need_unlock = 0;
552         int need_endtrans = 0;
553         int ret;
554 
555         if (!(flags & I_DIRTY_INODE))
556                 return;
557         if (unlikely(gfs2_withdrawn(sdp)))
558                 return;
559         if (!gfs2_glock_is_locked_by_me(ip->i_gl)) {
560                 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
561                 if (ret) {
562                         fs_err(sdp, "dirty_inode: glock %d\n", ret);
563                         return;
564                 }
565                 need_unlock = 1;
566         } else if (WARN_ON_ONCE(ip->i_gl->gl_state != LM_ST_EXCLUSIVE))
567                 return;
568 
569         if (current->journal_info == NULL) {
570                 ret = gfs2_trans_begin(sdp, RES_DINODE, 0);
571                 if (ret) {
572                         fs_err(sdp, "dirty_inode: gfs2_trans_begin %d\n", ret);
573                         goto out;
574                 }
575                 need_endtrans = 1;
576         }
577 
578         ret = gfs2_meta_inode_buffer(ip, &bh);
579         if (ret == 0) {
580                 gfs2_trans_add_meta(ip->i_gl, bh);
581                 gfs2_dinode_out(ip, bh->b_data);
582                 brelse(bh);
583         }
584 
585         if (need_endtrans)
586                 gfs2_trans_end(sdp);
587 out:
588         if (need_unlock)
589                 gfs2_glock_dq_uninit(&gh);
590 }
591 
592 /**
593  * gfs2_make_fs_ro - Turn a Read-Write FS into a Read-Only one
594  * @sdp: the filesystem
595  *
596  * Returns: errno
597  */
598 
599 int gfs2_make_fs_ro(struct gfs2_sbd *sdp)
600 {
601         struct gfs2_holder freeze_gh;
602         int error;
603 
604         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, GL_NOCACHE,
605                                    &freeze_gh);
606         if (error && !gfs2_withdrawn(sdp))
607                 return error;
608 
609         flush_workqueue(gfs2_delete_workqueue);
610         if (sdp->sd_quotad_process)
611                 kthread_stop(sdp->sd_quotad_process);
612         sdp->sd_quotad_process = NULL;
613         if (sdp->sd_logd_process)
614                 kthread_stop(sdp->sd_logd_process);
615         sdp->sd_logd_process = NULL;
616 
617         gfs2_quota_sync(sdp->sd_vfs, 0);
618         gfs2_statfs_sync(sdp->sd_vfs, 0);
619 
620         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SHUTDOWN |
621                        GFS2_LFC_MAKE_FS_RO);
622         wait_event(sdp->sd_reserving_log_wait, atomic_read(&sdp->sd_reserving_log) == 0);
623         gfs2_assert_warn(sdp, atomic_read(&sdp->sd_log_blks_free) == sdp->sd_jdesc->jd_blocks);
624 
625         if (gfs2_holder_initialized(&freeze_gh))
626                 gfs2_glock_dq_uninit(&freeze_gh);
627 
628         gfs2_quota_cleanup(sdp);
629 
630         return error;
631 }
632 
633 /**
634  * gfs2_put_super - Unmount the filesystem
635  * @sb: The VFS superblock
636  *
637  */
638 
639 static void gfs2_put_super(struct super_block *sb)
640 {
641         struct gfs2_sbd *sdp = sb->s_fs_info;
642         int error;
643         struct gfs2_jdesc *jd;
644 
645         /* No more recovery requests */
646         set_bit(SDF_NORECOVERY, &sdp->sd_flags);
647         smp_mb();
648 
649         /* Wait on outstanding recovery */
650 restart:
651         spin_lock(&sdp->sd_jindex_spin);
652         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
653                 if (!test_bit(JDF_RECOVERY, &jd->jd_flags))
654                         continue;
655                 spin_unlock(&sdp->sd_jindex_spin);
656                 wait_on_bit(&jd->jd_flags, JDF_RECOVERY,
657                             TASK_UNINTERRUPTIBLE);
658                 goto restart;
659         }
660         spin_unlock(&sdp->sd_jindex_spin);
661 
662         if (!sb_rdonly(sb)) {
663                 error = gfs2_make_fs_ro(sdp);
664                 if (error)
665                         gfs2_io_error(sdp);
666         }
667         /*  At this point, we're through modifying the disk  */
668 
669         /*  Release stuff  */
670 
671         iput(sdp->sd_jindex);
672         iput(sdp->sd_statfs_inode);
673         iput(sdp->sd_rindex);
674         iput(sdp->sd_quota_inode);
675 
676         gfs2_glock_put(sdp->sd_rename_gl);
677         gfs2_glock_put(sdp->sd_freeze_gl);
678 
679         if (!sdp->sd_args.ar_spectator) {
680                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
681                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
682                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
683                 gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
684                 iput(sdp->sd_sc_inode);
685                 iput(sdp->sd_qc_inode);
686         }
687 
688         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
689         gfs2_clear_rgrpd(sdp);
690         gfs2_jindex_free(sdp);
691         /*  Take apart glock structures and buffer lists  */
692         gfs2_gl_hash_clear(sdp);
693         gfs2_delete_debugfs_file(sdp);
694         /*  Unmount the locking protocol  */
695         gfs2_lm_unmount(sdp);
696 
697         /*  At this point, we're through participating in the lockspace  */
698         gfs2_sys_fs_del(sdp);
699 }
700 
701 /**
702  * gfs2_sync_fs - sync the filesystem
703  * @sb: the superblock
704  *
705  * Flushes the log to disk.
706  */
707 
708 static int gfs2_sync_fs(struct super_block *sb, int wait)
709 {
710         struct gfs2_sbd *sdp = sb->s_fs_info;
711 
712         gfs2_quota_sync(sb, -1);
713         if (wait)
714                 gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_NORMAL |
715                                GFS2_LFC_SYNC_FS);
716         return sdp->sd_log_error;
717 }
718 
719 void gfs2_freeze_func(struct work_struct *work)
720 {
721         int error;
722         struct gfs2_holder freeze_gh;
723         struct gfs2_sbd *sdp = container_of(work, struct gfs2_sbd, sd_freeze_work);
724         struct super_block *sb = sdp->sd_vfs;
725 
726         atomic_inc(&sb->s_active);
727         error = gfs2_glock_nq_init(sdp->sd_freeze_gl, LM_ST_SHARED, 0,
728                                    &freeze_gh);
729         if (error) {
730                 fs_info(sdp, "GFS2: couldn't get freeze lock : %d\n", error);
731                 gfs2_assert_withdraw(sdp, 0);
732         } else {
733                 atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
734                 error = thaw_super(sb);
735                 if (error) {
736                         fs_info(sdp, "GFS2: couldn't thaw filesystem: %d\n",
737                                 error);
738                         gfs2_assert_withdraw(sdp, 0);
739                 }
740                 if (!test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags))
741                         freeze_gh.gh_flags |= GL_NOCACHE;
742                 gfs2_glock_dq_uninit(&freeze_gh);
743         }
744         deactivate_super(sb);
745         clear_bit_unlock(SDF_FS_FROZEN, &sdp->sd_flags);
746         wake_up_bit(&sdp->sd_flags, SDF_FS_FROZEN);
747         return;
748 }
749 
750 /**
751  * gfs2_freeze - prevent further writes to the filesystem
752  * @sb: the VFS structure for the filesystem
753  *
754  */
755 
756 static int gfs2_freeze(struct super_block *sb)
757 {
758         struct gfs2_sbd *sdp = sb->s_fs_info;
759         int error = 0;
760 
761         mutex_lock(&sdp->sd_freeze_mutex);
762         if (atomic_read(&sdp->sd_freeze_state) != SFS_UNFROZEN)
763                 goto out;
764 
765         for (;;) {
766                 if (gfs2_withdrawn(sdp)) {
767                         error = -EINVAL;
768                         goto out;
769                 }
770 
771                 error = gfs2_lock_fs_check_clean(sdp);
772                 if (!error)
773                         break;
774 
775                 if (error == -EBUSY)
776                         fs_err(sdp, "waiting for recovery before freeze\n");
777                 else if (error == -EIO) {
778                         fs_err(sdp, "Fatal IO error: cannot freeze gfs2 due "
779                                "to recovery error.\n");
780                         goto out;
781                 } else {
782                         fs_err(sdp, "error freezing FS: %d\n", error);
783                 }
784                 fs_err(sdp, "retrying...\n");
785                 msleep(1000);
786         }
787         set_bit(SDF_FS_FROZEN, &sdp->sd_flags);
788 out:
789         mutex_unlock(&sdp->sd_freeze_mutex);
790         return error;
791 }
792 
793 /**
794  * gfs2_unfreeze - reallow writes to the filesystem
795  * @sb: the VFS structure for the filesystem
796  *
797  */
798 
799 static int gfs2_unfreeze(struct super_block *sb)
800 {
801         struct gfs2_sbd *sdp = sb->s_fs_info;
802 
803         mutex_lock(&sdp->sd_freeze_mutex);
804         if (atomic_read(&sdp->sd_freeze_state) != SFS_FROZEN ||
805             !gfs2_holder_initialized(&sdp->sd_freeze_gh)) {
806                 mutex_unlock(&sdp->sd_freeze_mutex);
807                 return 0;
808         }
809 
810         gfs2_glock_dq_uninit(&sdp->sd_freeze_gh);
811         mutex_unlock(&sdp->sd_freeze_mutex);
812         return wait_on_bit(&sdp->sd_flags, SDF_FS_FROZEN, TASK_INTERRUPTIBLE);
813 }
814 
815 /**
816  * statfs_fill - fill in the sg for a given RG
817  * @rgd: the RG
818  * @sc: the sc structure
819  *
820  * Returns: 0 on success, -ESTALE if the LVB is invalid
821  */
822 
823 static int statfs_slow_fill(struct gfs2_rgrpd *rgd,
824                             struct gfs2_statfs_change_host *sc)
825 {
826         gfs2_rgrp_verify(rgd);
827         sc->sc_total += rgd->rd_data;
828         sc->sc_free += rgd->rd_free;
829         sc->sc_dinodes += rgd->rd_dinodes;
830         return 0;
831 }
832 
833 /**
834  * gfs2_statfs_slow - Stat a filesystem using asynchronous locking
835  * @sdp: the filesystem
836  * @sc: the sc info that will be returned
837  *
838  * Any error (other than a signal) will cause this routine to fall back
839  * to the synchronous version.
840  *
841  * FIXME: This really shouldn't busy wait like this.
842  *
843  * Returns: errno
844  */
845 
846 static int gfs2_statfs_slow(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
847 {
848         struct gfs2_rgrpd *rgd_next;
849         struct gfs2_holder *gha, *gh;
850         unsigned int slots = 64;
851         unsigned int x;
852         int done;
853         int error = 0, err;
854 
855         memset(sc, 0, sizeof(struct gfs2_statfs_change_host));
856         gha = kmalloc_array(slots, sizeof(struct gfs2_holder), GFP_KERNEL);
857         if (!gha)
858                 return -ENOMEM;
859         for (x = 0; x < slots; x++)
860                 gfs2_holder_mark_uninitialized(gha + x);
861 
862         rgd_next = gfs2_rgrpd_get_first(sdp);
863 
864         for (;;) {
865                 done = 1;
866 
867                 for (x = 0; x < slots; x++) {
868                         gh = gha + x;
869 
870                         if (gfs2_holder_initialized(gh) && gfs2_glock_poll(gh)) {
871                                 err = gfs2_glock_wait(gh);
872                                 if (err) {
873                                         gfs2_holder_uninit(gh);
874                                         error = err;
875                                 } else {
876                                         if (!error) {
877                                                 struct gfs2_rgrpd *rgd =
878                                                         gfs2_glock2rgrp(gh->gh_gl);
879 
880                                                 error = statfs_slow_fill(rgd, sc);
881                                         }
882                                         gfs2_glock_dq_uninit(gh);
883                                 }
884                         }
885 
886                         if (gfs2_holder_initialized(gh))
887                                 done = 0;
888                         else if (rgd_next && !error) {
889                                 error = gfs2_glock_nq_init(rgd_next->rd_gl,
890                                                            LM_ST_SHARED,
891                                                            GL_ASYNC,
892                                                            gh);
893                                 rgd_next = gfs2_rgrpd_get_next(rgd_next);
894                                 done = 0;
895                         }
896 
897                         if (signal_pending(current))
898                                 error = -ERESTARTSYS;
899                 }
900 
901                 if (done)
902                         break;
903 
904                 yield();
905         }
906 
907         kfree(gha);
908         return error;
909 }
910 
911 /**
912  * gfs2_statfs_i - Do a statfs
913  * @sdp: the filesystem
914  * @sg: the sg structure
915  *
916  * Returns: errno
917  */
918 
919 static int gfs2_statfs_i(struct gfs2_sbd *sdp, struct gfs2_statfs_change_host *sc)
920 {
921         struct gfs2_statfs_change_host *m_sc = &sdp->sd_statfs_master;
922         struct gfs2_statfs_change_host *l_sc = &sdp->sd_statfs_local;
923 
924         spin_lock(&sdp->sd_statfs_spin);
925 
926         *sc = *m_sc;
927         sc->sc_total += l_sc->sc_total;
928         sc->sc_free += l_sc->sc_free;
929         sc->sc_dinodes += l_sc->sc_dinodes;
930 
931         spin_unlock(&sdp->sd_statfs_spin);
932 
933         if (sc->sc_free < 0)
934                 sc->sc_free = 0;
935         if (sc->sc_free > sc->sc_total)
936                 sc->sc_free = sc->sc_total;
937         if (sc->sc_dinodes < 0)
938                 sc->sc_dinodes = 0;
939 
940         return 0;
941 }
942 
943 /**
944  * gfs2_statfs - Gather and return stats about the filesystem
945  * @sb: The superblock
946  * @statfsbuf: The buffer
947  *
948  * Returns: 0 on success or error code
949  */
950 
951 static int gfs2_statfs(struct dentry *dentry, struct kstatfs *buf)
952 {
953         struct super_block *sb = dentry->d_sb;
954         struct gfs2_sbd *sdp = sb->s_fs_info;
955         struct gfs2_statfs_change_host sc;
956         int error;
957 
958         error = gfs2_rindex_update(sdp);
959         if (error)
960                 return error;
961 
962         if (gfs2_tune_get(sdp, gt_statfs_slow))
963                 error = gfs2_statfs_slow(sdp, &sc);
964         else
965                 error = gfs2_statfs_i(sdp, &sc);
966 
967         if (error)
968                 return error;
969 
970         buf->f_type = GFS2_MAGIC;
971         buf->f_bsize = sdp->sd_sb.sb_bsize;
972         buf->f_blocks = sc.sc_total;
973         buf->f_bfree = sc.sc_free;
974         buf->f_bavail = sc.sc_free;
975         buf->f_files = sc.sc_dinodes + sc.sc_free;
976         buf->f_ffree = sc.sc_free;
977         buf->f_namelen = GFS2_FNAMESIZE;
978 
979         return 0;
980 }
981 
982 /**
983  * gfs2_drop_inode - Drop an inode (test for remote unlink)
984  * @inode: The inode to drop
985  *
986  * If we've received a callback on an iopen lock then it's because a
987  * remote node tried to deallocate the inode but failed due to this node
988  * still having the inode open. Here we mark the link count zero
989  * since we know that it must have reached zero if the GLF_DEMOTE flag
990  * is set on the iopen glock. If we didn't do a disk read since the
991  * remote node removed the final link then we might otherwise miss
992  * this event. This check ensures that this node will deallocate the
993  * inode's blocks, or alternatively pass the baton on to another
994  * node for later deallocation.
995  */
996 
997 static int gfs2_drop_inode(struct inode *inode)
998 {
999         struct gfs2_inode *ip = GFS2_I(inode);
1000 
1001         if (!test_bit(GIF_FREE_VFS_INODE, &ip->i_flags) &&
1002             inode->i_nlink &&
1003             gfs2_holder_initialized(&ip->i_iopen_gh)) {
1004                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1005                 if (test_bit(GLF_DEMOTE, &gl->gl_flags))
1006                         clear_nlink(inode);
1007         }
1008 
1009         /*
1010          * When under memory pressure when an inode's link count has dropped to
1011          * zero, defer deleting the inode to the delete workqueue.  This avoids
1012          * calling into DLM under memory pressure, which can deadlock.
1013          */
1014         if (!inode->i_nlink &&
1015             unlikely(current->flags & PF_MEMALLOC) &&
1016             gfs2_holder_initialized(&ip->i_iopen_gh)) {
1017                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1018 
1019                 gfs2_glock_hold(gl);
1020                 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
1021                         gfs2_glock_queue_put(gl);
1022                 return false;
1023         }
1024 
1025         return generic_drop_inode(inode);
1026 }
1027 
1028 static int is_ancestor(const struct dentry *d1, const struct dentry *d2)
1029 {
1030         do {
1031                 if (d1 == d2)
1032                         return 1;
1033                 d1 = d1->d_parent;
1034         } while (!IS_ROOT(d1));
1035         return 0;
1036 }
1037 
1038 /**
1039  * gfs2_show_options - Show mount options for /proc/mounts
1040  * @s: seq_file structure
1041  * @root: root of this (sub)tree
1042  *
1043  * Returns: 0 on success or error code
1044  */
1045 
1046 static int gfs2_show_options(struct seq_file *s, struct dentry *root)
1047 {
1048         struct gfs2_sbd *sdp = root->d_sb->s_fs_info;
1049         struct gfs2_args *args = &sdp->sd_args;
1050         int val;
1051 
1052         if (is_ancestor(root, sdp->sd_master_dir))
1053                 seq_puts(s, ",meta");
1054         if (args->ar_lockproto[0])
1055                 seq_show_option(s, "lockproto", args->ar_lockproto);
1056         if (args->ar_locktable[0])
1057                 seq_show_option(s, "locktable", args->ar_locktable);
1058         if (args->ar_hostdata[0])
1059                 seq_show_option(s, "hostdata", args->ar_hostdata);
1060         if (args->ar_spectator)
1061                 seq_puts(s, ",spectator");
1062         if (args->ar_localflocks)
1063                 seq_puts(s, ",localflocks");
1064         if (args->ar_debug)
1065                 seq_puts(s, ",debug");
1066         if (args->ar_posix_acl)
1067                 seq_puts(s, ",acl");
1068         if (args->ar_quota != GFS2_QUOTA_DEFAULT) {
1069                 char *state;
1070                 switch (args->ar_quota) {
1071                 case GFS2_QUOTA_OFF:
1072                         state = "off";
1073                         break;
1074                 case GFS2_QUOTA_ACCOUNT:
1075                         state = "account";
1076                         break;
1077                 case GFS2_QUOTA_ON:
1078                         state = "on";
1079                         break;
1080                 default:
1081                         state = "unknown";
1082                         break;
1083                 }
1084                 seq_printf(s, ",quota=%s", state);
1085         }
1086         if (args->ar_suiddir)
1087                 seq_puts(s, ",suiddir");
1088         if (args->ar_data != GFS2_DATA_DEFAULT) {
1089                 char *state;
1090                 switch (args->ar_data) {
1091                 case GFS2_DATA_WRITEBACK:
1092                         state = "writeback";
1093                         break;
1094                 case GFS2_DATA_ORDERED:
1095                         state = "ordered";
1096                         break;
1097                 default:
1098                         state = "unknown";
1099                         break;
1100                 }
1101                 seq_printf(s, ",data=%s", state);
1102         }
1103         if (args->ar_discard)
1104                 seq_puts(s, ",discard");
1105         val = sdp->sd_tune.gt_logd_secs;
1106         if (val != 30)
1107                 seq_printf(s, ",commit=%d", val);
1108         val = sdp->sd_tune.gt_statfs_quantum;
1109         if (val != 30)
1110                 seq_printf(s, ",statfs_quantum=%d", val);
1111         else if (sdp->sd_tune.gt_statfs_slow)
1112                 seq_puts(s, ",statfs_quantum=0");
1113         val = sdp->sd_tune.gt_quota_quantum;
1114         if (val != 60)
1115                 seq_printf(s, ",quota_quantum=%d", val);
1116         if (args->ar_statfs_percent)
1117                 seq_printf(s, ",statfs_percent=%d", args->ar_statfs_percent);
1118         if (args->ar_errors != GFS2_ERRORS_DEFAULT) {
1119                 const char *state;
1120 
1121                 switch (args->ar_errors) {
1122                 case GFS2_ERRORS_WITHDRAW:
1123                         state = "withdraw";
1124                         break;
1125                 case GFS2_ERRORS_PANIC:
1126                         state = "panic";
1127                         break;
1128                 default:
1129                         state = "unknown";
1130                         break;
1131                 }
1132                 seq_printf(s, ",errors=%s", state);
1133         }
1134         if (test_bit(SDF_NOBARRIERS, &sdp->sd_flags))
1135                 seq_puts(s, ",nobarrier");
1136         if (test_bit(SDF_DEMOTE, &sdp->sd_flags))
1137                 seq_puts(s, ",demote_interface_used");
1138         if (args->ar_rgrplvb)
1139                 seq_puts(s, ",rgrplvb");
1140         if (args->ar_loccookie)
1141                 seq_puts(s, ",loccookie");
1142         return 0;
1143 }
1144 
1145 static void gfs2_final_release_pages(struct gfs2_inode *ip)
1146 {
1147         struct inode *inode = &ip->i_inode;
1148         struct gfs2_glock *gl = ip->i_gl;
1149 
1150         truncate_inode_pages(gfs2_glock2aspace(ip->i_gl), 0);
1151         truncate_inode_pages(&inode->i_data, 0);
1152 
1153         if (atomic_read(&gl->gl_revokes) == 0) {
1154                 clear_bit(GLF_LFLUSH, &gl->gl_flags);
1155                 clear_bit(GLF_DIRTY, &gl->gl_flags);
1156         }
1157 }
1158 
1159 static int gfs2_dinode_dealloc(struct gfs2_inode *ip)
1160 {
1161         struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
1162         struct gfs2_rgrpd *rgd;
1163         struct gfs2_holder gh;
1164         int error;
1165 
1166         if (gfs2_get_inode_blocks(&ip->i_inode) != 1) {
1167                 gfs2_consist_inode(ip);
1168                 return -EIO;
1169         }
1170 
1171         error = gfs2_rindex_update(sdp);
1172         if (error)
1173                 return error;
1174 
1175         error = gfs2_quota_hold(ip, NO_UID_QUOTA_CHANGE, NO_GID_QUOTA_CHANGE);
1176         if (error)
1177                 return error;
1178 
1179         rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr, 1);
1180         if (!rgd) {
1181                 gfs2_consist_inode(ip);
1182                 error = -EIO;
1183                 goto out_qs;
1184         }
1185 
1186         error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, &gh);
1187         if (error)
1188                 goto out_qs;
1189 
1190         error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA,
1191                                  sdp->sd_jdesc->jd_blocks);
1192         if (error)
1193                 goto out_rg_gunlock;
1194 
1195         gfs2_free_di(rgd, ip);
1196 
1197         gfs2_final_release_pages(ip);
1198 
1199         gfs2_trans_end(sdp);
1200 
1201 out_rg_gunlock:
1202         gfs2_glock_dq_uninit(&gh);
1203 out_qs:
1204         gfs2_quota_unhold(ip);
1205         return error;
1206 }
1207 
1208 /**
1209  * gfs2_glock_put_eventually
1210  * @gl: The glock to put
1211  *
1212  * When under memory pressure, trigger a deferred glock put to make sure we
1213  * won't call into DLM and deadlock.  Otherwise, put the glock directly.
1214  */
1215 
1216 static void gfs2_glock_put_eventually(struct gfs2_glock *gl)
1217 {
1218         if (current->flags & PF_MEMALLOC)
1219                 gfs2_glock_queue_put(gl);
1220         else
1221                 gfs2_glock_put(gl);
1222 }
1223 
1224 /**
1225  * gfs2_evict_inode - Remove an inode from cache
1226  * @inode: The inode to evict
1227  *
1228  * There are three cases to consider:
1229  * 1. i_nlink == 0, we are final opener (and must deallocate)
1230  * 2. i_nlink == 0, we are not the final opener (and cannot deallocate)
1231  * 3. i_nlink > 0
1232  *
1233  * If the fs is read only, then we have to treat all cases as per #3
1234  * since we are unable to do any deallocation. The inode will be
1235  * deallocated by the next read/write node to attempt an allocation
1236  * in the same resource group
1237  *
1238  * We have to (at the moment) hold the inodes main lock to cover
1239  * the gap between unlocking the shared lock on the iopen lock and
1240  * taking the exclusive lock. I'd rather do a shared -> exclusive
1241  * conversion on the iopen lock, but we can change that later. This
1242  * is safe, just less efficient.
1243  */
1244 
1245 static void gfs2_evict_inode(struct inode *inode)
1246 {
1247         struct super_block *sb = inode->i_sb;
1248         struct gfs2_sbd *sdp = sb->s_fs_info;
1249         struct gfs2_inode *ip = GFS2_I(inode);
1250         struct gfs2_holder gh;
1251         struct address_space *metamapping;
1252         int error;
1253 
1254         if (test_bit(GIF_FREE_VFS_INODE, &ip->i_flags)) {
1255                 clear_inode(inode);
1256                 return;
1257         }
1258 
1259         if (inode->i_nlink || sb_rdonly(sb))
1260                 goto out;
1261 
1262         if (test_bit(GIF_ALLOC_FAILED, &ip->i_flags)) {
1263                 BUG_ON(!gfs2_glock_is_locked_by_me(ip->i_gl));
1264                 gfs2_holder_mark_uninitialized(&gh);
1265                 goto alloc_failed;
1266         }
1267 
1268         /* Deletes should never happen under memory pressure anymore.  */
1269         if (WARN_ON_ONCE(current->flags & PF_MEMALLOC))
1270                 goto out;
1271 
1272         /* Must not read inode block until block type has been verified */
1273         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_SKIP, &gh);
1274         if (unlikely(error)) {
1275                 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1276                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1277                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1278                 goto out;
1279         }
1280 
1281         error = gfs2_check_blk_type(sdp, ip->i_no_addr, GFS2_BLKST_UNLINKED);
1282         if (error)
1283                 goto out_truncate;
1284 
1285         if (test_bit(GIF_INVALID, &ip->i_flags)) {
1286                 error = gfs2_inode_refresh(ip);
1287                 if (error)
1288                         goto out_truncate;
1289         }
1290 
1291         /*
1292          * The inode may have been recreated in the meantime.
1293          */
1294         if (inode->i_nlink)
1295                 goto out_truncate;
1296 
1297 alloc_failed:
1298         if (gfs2_holder_initialized(&ip->i_iopen_gh) &&
1299             test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1300                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1301                 gfs2_glock_dq_wait(&ip->i_iopen_gh);
1302                 gfs2_holder_reinit(LM_ST_EXCLUSIVE, LM_FLAG_TRY_1CB | GL_NOCACHE,
1303                                    &ip->i_iopen_gh);
1304                 error = gfs2_glock_nq(&ip->i_iopen_gh);
1305                 if (error)
1306                         goto out_truncate;
1307         }
1308 
1309         if (S_ISDIR(inode->i_mode) &&
1310             (ip->i_diskflags & GFS2_DIF_EXHASH)) {
1311                 error = gfs2_dir_exhash_dealloc(ip);
1312                 if (error)
1313                         goto out_unlock;
1314         }
1315 
1316         if (ip->i_eattr) {
1317                 error = gfs2_ea_dealloc(ip);
1318                 if (error)
1319                         goto out_unlock;
1320         }
1321 
1322         if (!gfs2_is_stuffed(ip)) {
1323                 error = gfs2_file_dealloc(ip);
1324                 if (error)
1325                         goto out_unlock;
1326         }
1327 
1328         /* We're about to clear the bitmap for the dinode, but as soon as we
1329            do, gfs2_create_inode can create another inode at the same block
1330            location and try to set gl_object again. We clear gl_object here so
1331            that subsequent inode creates don't see an old gl_object. */
1332         glock_clear_object(ip->i_gl, ip);
1333         error = gfs2_dinode_dealloc(ip);
1334         goto out_unlock;
1335 
1336 out_truncate:
1337         gfs2_log_flush(sdp, ip->i_gl, GFS2_LOG_HEAD_FLUSH_NORMAL |
1338                        GFS2_LFC_EVICT_INODE);
1339         metamapping = gfs2_glock2aspace(ip->i_gl);
1340         if (test_bit(GLF_DIRTY, &ip->i_gl->gl_flags)) {
1341                 filemap_fdatawrite(metamapping);
1342                 filemap_fdatawait(metamapping);
1343         }
1344         write_inode_now(inode, 1);
1345         gfs2_ail_flush(ip->i_gl, 0);
1346 
1347         error = gfs2_trans_begin(sdp, 0, sdp->sd_jdesc->jd_blocks);
1348         if (error)
1349                 goto out_unlock;
1350         /* Needs to be done before glock release & also in a transaction */
1351         truncate_inode_pages(&inode->i_data, 0);
1352         truncate_inode_pages(metamapping, 0);
1353         gfs2_trans_end(sdp);
1354 
1355 out_unlock:
1356         if (gfs2_rs_active(&ip->i_res))
1357                 gfs2_rs_deltree(&ip->i_res);
1358 
1359         if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1360                 glock_clear_object(ip->i_iopen_gh.gh_gl, ip);
1361                 if (test_bit(HIF_HOLDER, &ip->i_iopen_gh.gh_iflags)) {
1362                         ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1363                         gfs2_glock_dq(&ip->i_iopen_gh);
1364                 }
1365                 gfs2_holder_uninit(&ip->i_iopen_gh);
1366         }
1367         if (gfs2_holder_initialized(&gh)) {
1368                 glock_clear_object(ip->i_gl, ip);
1369                 gfs2_glock_dq_uninit(&gh);
1370         }
1371         if (error && error != GLR_TRYFAILED && error != -EROFS)
1372                 fs_warn(sdp, "gfs2_evict_inode: %d\n", error);
1373 out:
1374         truncate_inode_pages_final(&inode->i_data);
1375         gfs2_rsqa_delete(ip, NULL);
1376         gfs2_ordered_del_inode(ip);
1377         clear_inode(inode);
1378         gfs2_dir_hash_inval(ip);
1379         glock_clear_object(ip->i_gl, ip);
1380         wait_on_bit_io(&ip->i_flags, GIF_GLOP_PENDING, TASK_UNINTERRUPTIBLE);
1381         gfs2_glock_add_to_lru(ip->i_gl);
1382         gfs2_glock_put_eventually(ip->i_gl);
1383         ip->i_gl = NULL;
1384         if (gfs2_holder_initialized(&ip->i_iopen_gh)) {
1385                 struct gfs2_glock *gl = ip->i_iopen_gh.gh_gl;
1386 
1387                 glock_clear_object(gl, ip);
1388                 ip->i_iopen_gh.gh_flags |= GL_NOCACHE;
1389                 gfs2_glock_hold(gl);
1390                 gfs2_glock_dq_uninit(&ip->i_iopen_gh);
1391                 gfs2_glock_put_eventually(gl);
1392         }
1393 }
1394 
1395 static struct inode *gfs2_alloc_inode(struct super_block *sb)
1396 {
1397         struct gfs2_inode *ip;
1398 
1399         ip = kmem_cache_alloc(gfs2_inode_cachep, GFP_KERNEL);
1400         if (!ip)
1401                 return NULL;
1402         ip->i_flags = 0;
1403         ip->i_gl = NULL;
1404         memset(&ip->i_res, 0, sizeof(ip->i_res));
1405         RB_CLEAR_NODE(&ip->i_res.rs_node);
1406         ip->i_rahead = 0;
1407         return &ip->i_inode;
1408 }
1409 
1410 static void gfs2_free_inode(struct inode *inode)
1411 {
1412         kmem_cache_free(gfs2_inode_cachep, GFS2_I(inode));
1413 }
1414 
1415 const struct super_operations gfs2_super_ops = {
1416         .alloc_inode            = gfs2_alloc_inode,
1417         .free_inode             = gfs2_free_inode,
1418         .write_inode            = gfs2_write_inode,
1419         .dirty_inode            = gfs2_dirty_inode,
1420         .evict_inode            = gfs2_evict_inode,
1421         .put_super              = gfs2_put_super,
1422         .sync_fs                = gfs2_sync_fs,
1423         .freeze_super           = gfs2_freeze,
1424         .thaw_super             = gfs2_unfreeze,
1425         .statfs                 = gfs2_statfs,
1426         .drop_inode             = gfs2_drop_inode,
1427         .show_options           = gfs2_show_options,
1428 };
1429 
1430 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp