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

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  1 /*
  2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
  3  * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
  4  *
  5  * This copyrighted material is made available to anyone wishing to use,
  6  * modify, copy, or redistribute it subject to the terms and conditions
  7  * of the GNU General Public License version 2.
  8  */
  9 
 10 #include <linux/spinlock.h>
 11 #include <linux/completion.h>
 12 #include <linux/buffer_head.h>
 13 #include <linux/gfs2_ondisk.h>
 14 #include <linux/bio.h>
 15 #include <linux/posix_acl.h>
 16 
 17 #include "gfs2.h"
 18 #include "incore.h"
 19 #include "bmap.h"
 20 #include "glock.h"
 21 #include "glops.h"
 22 #include "inode.h"
 23 #include "log.h"
 24 #include "meta_io.h"
 25 #include "recovery.h"
 26 #include "rgrp.h"
 27 #include "util.h"
 28 #include "trans.h"
 29 #include "dir.h"
 30 
 31 static void gfs2_ail_error(struct gfs2_glock *gl, const struct buffer_head *bh)
 32 {
 33         fs_err(gl->gl_sbd, "AIL buffer %p: blocknr %llu state 0x%08lx mapping %p page state 0x%lx\n",
 34                bh, (unsigned long long)bh->b_blocknr, bh->b_state,
 35                bh->b_page->mapping, bh->b_page->flags);
 36         fs_err(gl->gl_sbd, "AIL glock %u:%llu mapping %p\n",
 37                gl->gl_name.ln_type, gl->gl_name.ln_number,
 38                gfs2_glock2aspace(gl));
 39         gfs2_lm_withdraw(gl->gl_sbd, "AIL error\n");
 40 }
 41 
 42 /**
 43  * __gfs2_ail_flush - remove all buffers for a given lock from the AIL
 44  * @gl: the glock
 45  * @fsync: set when called from fsync (not all buffers will be clean)
 46  *
 47  * None of the buffers should be dirty, locked, or pinned.
 48  */
 49 
 50 static void __gfs2_ail_flush(struct gfs2_glock *gl, bool fsync,
 51                              unsigned int nr_revokes)
 52 {
 53         struct gfs2_sbd *sdp = gl->gl_sbd;
 54         struct list_head *head = &gl->gl_ail_list;
 55         struct gfs2_bufdata *bd, *tmp;
 56         struct buffer_head *bh;
 57         const unsigned long b_state = (1UL << BH_Dirty)|(1UL << BH_Pinned)|(1UL << BH_Lock);
 58 
 59         gfs2_log_lock(sdp);
 60         spin_lock(&sdp->sd_ail_lock);
 61         list_for_each_entry_safe_reverse(bd, tmp, head, bd_ail_gl_list) {
 62                 if (nr_revokes == 0)
 63                         break;
 64                 bh = bd->bd_bh;
 65                 if (bh->b_state & b_state) {
 66                         if (fsync)
 67                                 continue;
 68                         gfs2_ail_error(gl, bh);
 69                 }
 70                 gfs2_trans_add_revoke(sdp, bd);
 71                 nr_revokes--;
 72         }
 73         GLOCK_BUG_ON(gl, !fsync && atomic_read(&gl->gl_ail_count));
 74         spin_unlock(&sdp->sd_ail_lock);
 75         gfs2_log_unlock(sdp);
 76 }
 77 
 78 
 79 static void gfs2_ail_empty_gl(struct gfs2_glock *gl)
 80 {
 81         struct gfs2_sbd *sdp = gl->gl_sbd;
 82         struct gfs2_trans tr;
 83 
 84         memset(&tr, 0, sizeof(tr));
 85         tr.tr_revokes = atomic_read(&gl->gl_ail_count);
 86 
 87         if (!tr.tr_revokes)
 88                 return;
 89 
 90         /* A shortened, inline version of gfs2_trans_begin() */
 91         tr.tr_reserved = 1 + gfs2_struct2blk(sdp, tr.tr_revokes, sizeof(u64));
 92         tr.tr_ip = (unsigned long)__builtin_return_address(0);
 93         sb_start_intwrite(sdp->sd_vfs);
 94         gfs2_log_reserve(sdp, tr.tr_reserved);
 95         WARN_ON_ONCE(current->journal_info);
 96         current->journal_info = &tr;
 97 
 98         __gfs2_ail_flush(gl, 0, tr.tr_revokes);
 99 
100         gfs2_trans_end(sdp);
101         gfs2_log_flush(sdp, NULL);
102 }
103 
104 void gfs2_ail_flush(struct gfs2_glock *gl, bool fsync)
105 {
106         struct gfs2_sbd *sdp = gl->gl_sbd;
107         unsigned int revokes = atomic_read(&gl->gl_ail_count);
108         unsigned int max_revokes = (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
109         int ret;
110 
111         if (!revokes)
112                 return;
113 
114         while (revokes > max_revokes)
115                 max_revokes += (sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header)) / sizeof(u64);
116 
117         ret = gfs2_trans_begin(sdp, 0, max_revokes);
118         if (ret)
119                 return;
120         __gfs2_ail_flush(gl, fsync, max_revokes);
121         gfs2_trans_end(sdp);
122         gfs2_log_flush(sdp, NULL);
123 }
124 
125 /**
126  * rgrp_go_sync - sync out the metadata for this glock
127  * @gl: the glock
128  *
129  * Called when demoting or unlocking an EX glock.  We must flush
130  * to disk all dirty buffers/pages relating to this glock, and must not
131  * not return to caller to demote/unlock the glock until I/O is complete.
132  */
133 
134 static void rgrp_go_sync(struct gfs2_glock *gl)
135 {
136         struct address_space *metamapping = gfs2_glock2aspace(gl);
137         struct gfs2_rgrpd *rgd;
138         int error;
139 
140         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
141                 return;
142         GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
143 
144         gfs2_log_flush(gl->gl_sbd, gl);
145         filemap_fdatawrite(metamapping);
146         error = filemap_fdatawait(metamapping);
147         mapping_set_error(metamapping, error);
148         gfs2_ail_empty_gl(gl);
149 
150         spin_lock(&gl->gl_spin);
151         rgd = gl->gl_object;
152         if (rgd)
153                 gfs2_free_clones(rgd);
154         spin_unlock(&gl->gl_spin);
155 }
156 
157 /**
158  * rgrp_go_inval - invalidate the metadata for this glock
159  * @gl: the glock
160  * @flags:
161  *
162  * We never used LM_ST_DEFERRED with resource groups, so that we
163  * should always see the metadata flag set here.
164  *
165  */
166 
167 static void rgrp_go_inval(struct gfs2_glock *gl, int flags)
168 {
169         struct address_space *mapping = gfs2_glock2aspace(gl);
170 
171         WARN_ON_ONCE(!(flags & DIO_METADATA));
172         gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
173         truncate_inode_pages(mapping, 0);
174 
175         if (gl->gl_object) {
176                 struct gfs2_rgrpd *rgd = (struct gfs2_rgrpd *)gl->gl_object;
177                 rgd->rd_flags &= ~GFS2_RDF_UPTODATE;
178         }
179 }
180 
181 /**
182  * inode_go_sync - Sync the dirty data and/or metadata for an inode glock
183  * @gl: the glock protecting the inode
184  *
185  */
186 
187 static void inode_go_sync(struct gfs2_glock *gl)
188 {
189         struct gfs2_inode *ip = gl->gl_object;
190         struct address_space *metamapping = gfs2_glock2aspace(gl);
191         int error;
192 
193         if (ip && !S_ISREG(ip->i_inode.i_mode))
194                 ip = NULL;
195         if (ip && test_and_clear_bit(GIF_SW_PAGED, &ip->i_flags))
196                 unmap_shared_mapping_range(ip->i_inode.i_mapping, 0, 0);
197         if (!test_and_clear_bit(GLF_DIRTY, &gl->gl_flags))
198                 return;
199 
200         GLOCK_BUG_ON(gl, gl->gl_state != LM_ST_EXCLUSIVE);
201 
202         gfs2_log_flush(gl->gl_sbd, gl);
203         filemap_fdatawrite(metamapping);
204         if (ip) {
205                 struct address_space *mapping = ip->i_inode.i_mapping;
206                 filemap_fdatawrite(mapping);
207                 error = filemap_fdatawait(mapping);
208                 mapping_set_error(mapping, error);
209         }
210         error = filemap_fdatawait(metamapping);
211         mapping_set_error(metamapping, error);
212         gfs2_ail_empty_gl(gl);
213         /*
214          * Writeback of the data mapping may cause the dirty flag to be set
215          * so we have to clear it again here.
216          */
217         smp_mb__before_clear_bit();
218         clear_bit(GLF_DIRTY, &gl->gl_flags);
219 }
220 
221 /**
222  * inode_go_inval - prepare a inode glock to be released
223  * @gl: the glock
224  * @flags:
225  * 
226  * Normally we invlidate everything, but if we are moving into
227  * LM_ST_DEFERRED from LM_ST_SHARED or LM_ST_EXCLUSIVE then we
228  * can keep hold of the metadata, since it won't have changed.
229  *
230  */
231 
232 static void inode_go_inval(struct gfs2_glock *gl, int flags)
233 {
234         struct gfs2_inode *ip = gl->gl_object;
235 
236         gfs2_assert_withdraw(gl->gl_sbd, !atomic_read(&gl->gl_ail_count));
237 
238         if (flags & DIO_METADATA) {
239                 struct address_space *mapping = gfs2_glock2aspace(gl);
240                 truncate_inode_pages(mapping, 0);
241                 if (ip) {
242                         set_bit(GIF_INVALID, &ip->i_flags);
243                         forget_all_cached_acls(&ip->i_inode);
244                         gfs2_dir_hash_inval(ip);
245                 }
246         }
247 
248         if (ip == GFS2_I(gl->gl_sbd->sd_rindex)) {
249                 gfs2_log_flush(gl->gl_sbd, NULL);
250                 gl->gl_sbd->sd_rindex_uptodate = 0;
251         }
252         if (ip && S_ISREG(ip->i_inode.i_mode))
253                 truncate_inode_pages(ip->i_inode.i_mapping, 0);
254 }
255 
256 /**
257  * inode_go_demote_ok - Check to see if it's ok to unlock an inode glock
258  * @gl: the glock
259  *
260  * Returns: 1 if it's ok
261  */
262 
263 static int inode_go_demote_ok(const struct gfs2_glock *gl)
264 {
265         struct gfs2_sbd *sdp = gl->gl_sbd;
266         struct gfs2_holder *gh;
267 
268         if (sdp->sd_jindex == gl->gl_object || sdp->sd_rindex == gl->gl_object)
269                 return 0;
270 
271         if (!list_empty(&gl->gl_holders)) {
272                 gh = list_entry(gl->gl_holders.next, struct gfs2_holder, gh_list);
273                 if (gh->gh_list.next != &gl->gl_holders)
274                         return 0;
275         }
276 
277         return 1;
278 }
279 
280 /**
281  * gfs2_set_nlink - Set the inode's link count based on on-disk info
282  * @inode: The inode in question
283  * @nlink: The link count
284  *
285  * If the link count has hit zero, it must never be raised, whatever the
286  * on-disk inode might say. When new struct inodes are created the link
287  * count is set to 1, so that we can safely use this test even when reading
288  * in on disk information for the first time.
289  */
290 
291 static void gfs2_set_nlink(struct inode *inode, u32 nlink)
292 {
293         /*
294          * We will need to review setting the nlink count here in the
295          * light of the forthcoming ro bind mount work. This is a reminder
296          * to do that.
297          */
298         if ((inode->i_nlink != nlink) && (inode->i_nlink != 0)) {
299                 if (nlink == 0)
300                         clear_nlink(inode);
301                 else
302                         set_nlink(inode, nlink);
303         }
304 }
305 
306 static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf)
307 {
308         const struct gfs2_dinode *str = buf;
309         struct timespec atime;
310         u16 height, depth;
311 
312         if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr)))
313                 goto corrupt;
314         ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino);
315         ip->i_inode.i_mode = be32_to_cpu(str->di_mode);
316         ip->i_inode.i_rdev = 0;
317         switch (ip->i_inode.i_mode & S_IFMT) {
318         case S_IFBLK:
319         case S_IFCHR:
320                 ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major),
321                                            be32_to_cpu(str->di_minor));
322                 break;
323         };
324 
325         i_uid_write(&ip->i_inode, be32_to_cpu(str->di_uid));
326         i_gid_write(&ip->i_inode, be32_to_cpu(str->di_gid));
327         gfs2_set_nlink(&ip->i_inode, be32_to_cpu(str->di_nlink));
328         i_size_write(&ip->i_inode, be64_to_cpu(str->di_size));
329         gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks));
330         atime.tv_sec = be64_to_cpu(str->di_atime);
331         atime.tv_nsec = be32_to_cpu(str->di_atime_nsec);
332         if (timespec_compare(&ip->i_inode.i_atime, &atime) < 0)
333                 ip->i_inode.i_atime = atime;
334         ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime);
335         ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec);
336         ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime);
337         ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec);
338 
339         ip->i_goal = be64_to_cpu(str->di_goal_meta);
340         ip->i_generation = be64_to_cpu(str->di_generation);
341 
342         ip->i_diskflags = be32_to_cpu(str->di_flags);
343         ip->i_eattr = be64_to_cpu(str->di_eattr);
344         /* i_diskflags and i_eattr must be set before gfs2_set_inode_flags() */
345         gfs2_set_inode_flags(&ip->i_inode);
346         height = be16_to_cpu(str->di_height);
347         if (unlikely(height > GFS2_MAX_META_HEIGHT))
348                 goto corrupt;
349         ip->i_height = (u8)height;
350 
351         depth = be16_to_cpu(str->di_depth);
352         if (unlikely(depth > GFS2_DIR_MAX_DEPTH))
353                 goto corrupt;
354         ip->i_depth = (u8)depth;
355         ip->i_entries = be32_to_cpu(str->di_entries);
356 
357         if (S_ISREG(ip->i_inode.i_mode))
358                 gfs2_set_aops(&ip->i_inode);
359 
360         return 0;
361 corrupt:
362         gfs2_consist_inode(ip);
363         return -EIO;
364 }
365 
366 /**
367  * gfs2_inode_refresh - Refresh the incore copy of the dinode
368  * @ip: The GFS2 inode
369  *
370  * Returns: errno
371  */
372 
373 int gfs2_inode_refresh(struct gfs2_inode *ip)
374 {
375         struct buffer_head *dibh;
376         int error;
377 
378         error = gfs2_meta_inode_buffer(ip, &dibh);
379         if (error)
380                 return error;
381 
382         error = gfs2_dinode_in(ip, dibh->b_data);
383         brelse(dibh);
384         clear_bit(GIF_INVALID, &ip->i_flags);
385 
386         return error;
387 }
388 
389 /**
390  * inode_go_lock - operation done after an inode lock is locked by a process
391  * @gl: the glock
392  * @flags:
393  *
394  * Returns: errno
395  */
396 
397 static int inode_go_lock(struct gfs2_holder *gh)
398 {
399         struct gfs2_glock *gl = gh->gh_gl;
400         struct gfs2_sbd *sdp = gl->gl_sbd;
401         struct gfs2_inode *ip = gl->gl_object;
402         int error = 0;
403 
404         if (!ip || (gh->gh_flags & GL_SKIP))
405                 return 0;
406 
407         if (test_bit(GIF_INVALID, &ip->i_flags)) {
408                 error = gfs2_inode_refresh(ip);
409                 if (error)
410                         return error;
411         }
412 
413         if ((ip->i_diskflags & GFS2_DIF_TRUNC_IN_PROG) &&
414             (gl->gl_state == LM_ST_EXCLUSIVE) &&
415             (gh->gh_state == LM_ST_EXCLUSIVE)) {
416                 spin_lock(&sdp->sd_trunc_lock);
417                 if (list_empty(&ip->i_trunc_list))
418                         list_add(&sdp->sd_trunc_list, &ip->i_trunc_list);
419                 spin_unlock(&sdp->sd_trunc_lock);
420                 wake_up(&sdp->sd_quota_wait);
421                 return 1;
422         }
423 
424         return error;
425 }
426 
427 /**
428  * inode_go_dump - print information about an inode
429  * @seq: The iterator
430  * @ip: the inode
431  *
432  * Returns: 0 on success, -ENOBUFS when we run out of space
433  */
434 
435 static int inode_go_dump(struct seq_file *seq, const struct gfs2_glock *gl)
436 {
437         const struct gfs2_inode *ip = gl->gl_object;
438         if (ip == NULL)
439                 return 0;
440         gfs2_print_dbg(seq, " I: n:%llu/%llu t:%u f:0x%02lx d:0x%08x s:%llu\n",
441                   (unsigned long long)ip->i_no_formal_ino,
442                   (unsigned long long)ip->i_no_addr,
443                   IF2DT(ip->i_inode.i_mode), ip->i_flags,
444                   (unsigned int)ip->i_diskflags,
445                   (unsigned long long)i_size_read(&ip->i_inode));
446         return 0;
447 }
448 
449 /**
450  * trans_go_sync - promote/demote the transaction glock
451  * @gl: the glock
452  * @state: the requested state
453  * @flags:
454  *
455  */
456 
457 static void trans_go_sync(struct gfs2_glock *gl)
458 {
459         struct gfs2_sbd *sdp = gl->gl_sbd;
460 
461         if (gl->gl_state != LM_ST_UNLOCKED &&
462             test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
463                 gfs2_meta_syncfs(sdp);
464                 gfs2_log_shutdown(sdp);
465         }
466 }
467 
468 /**
469  * trans_go_xmote_bh - After promoting/demoting the transaction glock
470  * @gl: the glock
471  *
472  */
473 
474 static int trans_go_xmote_bh(struct gfs2_glock *gl, struct gfs2_holder *gh)
475 {
476         struct gfs2_sbd *sdp = gl->gl_sbd;
477         struct gfs2_inode *ip = GFS2_I(sdp->sd_jdesc->jd_inode);
478         struct gfs2_glock *j_gl = ip->i_gl;
479         struct gfs2_log_header_host head;
480         int error;
481 
482         if (test_bit(SDF_JOURNAL_LIVE, &sdp->sd_flags)) {
483                 j_gl->gl_ops->go_inval(j_gl, DIO_METADATA);
484 
485                 error = gfs2_find_jhead(sdp->sd_jdesc, &head);
486                 if (error)
487                         gfs2_consist(sdp);
488                 if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT))
489                         gfs2_consist(sdp);
490 
491                 /*  Initialize some head of the log stuff  */
492                 if (!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) {
493                         sdp->sd_log_sequence = head.lh_sequence + 1;
494                         gfs2_log_pointers_init(sdp, head.lh_blkno);
495                 }
496         }
497         return 0;
498 }
499 
500 /**
501  * trans_go_demote_ok
502  * @gl: the glock
503  *
504  * Always returns 0
505  */
506 
507 static int trans_go_demote_ok(const struct gfs2_glock *gl)
508 {
509         return 0;
510 }
511 
512 /**
513  * iopen_go_callback - schedule the dcache entry for the inode to be deleted
514  * @gl: the glock
515  *
516  * gl_spin lock is held while calling this
517  */
518 static void iopen_go_callback(struct gfs2_glock *gl, bool remote)
519 {
520         struct gfs2_inode *ip = (struct gfs2_inode *)gl->gl_object;
521         struct gfs2_sbd *sdp = gl->gl_sbd;
522 
523         if (!remote || (sdp->sd_vfs->s_flags & MS_RDONLY))
524                 return;
525 
526         if (gl->gl_demote_state == LM_ST_UNLOCKED &&
527             gl->gl_state == LM_ST_SHARED && ip) {
528                 gfs2_glock_hold(gl);
529                 if (queue_work(gfs2_delete_workqueue, &gl->gl_delete) == 0)
530                         gfs2_glock_put_nolock(gl);
531         }
532 }
533 
534 const struct gfs2_glock_operations gfs2_meta_glops = {
535         .go_type = LM_TYPE_META,
536 };
537 
538 const struct gfs2_glock_operations gfs2_inode_glops = {
539         .go_sync = inode_go_sync,
540         .go_inval = inode_go_inval,
541         .go_demote_ok = inode_go_demote_ok,
542         .go_lock = inode_go_lock,
543         .go_dump = inode_go_dump,
544         .go_type = LM_TYPE_INODE,
545         .go_flags = GLOF_ASPACE,
546 };
547 
548 const struct gfs2_glock_operations gfs2_rgrp_glops = {
549         .go_sync = rgrp_go_sync,
550         .go_inval = rgrp_go_inval,
551         .go_lock = gfs2_rgrp_go_lock,
552         .go_unlock = gfs2_rgrp_go_unlock,
553         .go_dump = gfs2_rgrp_dump,
554         .go_type = LM_TYPE_RGRP,
555         .go_flags = GLOF_ASPACE | GLOF_LVB,
556 };
557 
558 const struct gfs2_glock_operations gfs2_trans_glops = {
559         .go_sync = trans_go_sync,
560         .go_xmote_bh = trans_go_xmote_bh,
561         .go_demote_ok = trans_go_demote_ok,
562         .go_type = LM_TYPE_NONDISK,
563 };
564 
565 const struct gfs2_glock_operations gfs2_iopen_glops = {
566         .go_type = LM_TYPE_IOPEN,
567         .go_callback = iopen_go_callback,
568 };
569 
570 const struct gfs2_glock_operations gfs2_flock_glops = {
571         .go_type = LM_TYPE_FLOCK,
572 };
573 
574 const struct gfs2_glock_operations gfs2_nondisk_glops = {
575         .go_type = LM_TYPE_NONDISK,
576 };
577 
578 const struct gfs2_glock_operations gfs2_quota_glops = {
579         .go_type = LM_TYPE_QUOTA,
580         .go_flags = GLOF_LVB,
581 };
582 
583 const struct gfs2_glock_operations gfs2_journal_glops = {
584         .go_type = LM_TYPE_JOURNAL,
585 };
586 
587 const struct gfs2_glock_operations *gfs2_glops_list[] = {
588         [LM_TYPE_META] = &gfs2_meta_glops,
589         [LM_TYPE_INODE] = &gfs2_inode_glops,
590         [LM_TYPE_RGRP] = &gfs2_rgrp_glops,
591         [LM_TYPE_IOPEN] = &gfs2_iopen_glops,
592         [LM_TYPE_FLOCK] = &gfs2_flock_glops,
593         [LM_TYPE_NONDISK] = &gfs2_nondisk_glops,
594         [LM_TYPE_QUOTA] = &gfs2_quota_glops,
595         [LM_TYPE_JOURNAL] = &gfs2_journal_glops,
596 };
597 
598 

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