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[linux-2.6] / fs / xfs / xfs_inode_item.c
1 /*
2  * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
3  * All Rights Reserved.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it would be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write the Free Software Foundation,
16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17  */
18 #include "xfs.h"
19 #include "xfs_fs.h"
20 #include "xfs_types.h"
21 #include "xfs_bit.h"
22 #include "xfs_log.h"
23 #include "xfs_inum.h"
24 #include "xfs_trans.h"
25 #include "xfs_buf_item.h"
26 #include "xfs_sb.h"
27 #include "xfs_ag.h"
28 #include "xfs_dir2.h"
29 #include "xfs_dmapi.h"
30 #include "xfs_mount.h"
31 #include "xfs_trans_priv.h"
32 #include "xfs_bmap_btree.h"
33 #include "xfs_alloc_btree.h"
34 #include "xfs_ialloc_btree.h"
35 #include "xfs_dir2_sf.h"
36 #include "xfs_attr_sf.h"
37 #include "xfs_dinode.h"
38 #include "xfs_inode.h"
39 #include "xfs_inode_item.h"
40 #include "xfs_btree.h"
41 #include "xfs_ialloc.h"
42 #include "xfs_rw.h"
43 #include "xfs_error.h"
44
45
46 kmem_zone_t     *xfs_ili_zone;          /* inode log item zone */
47
48 /*
49  * This returns the number of iovecs needed to log the given inode item.
50  *
51  * We need one iovec for the inode log format structure, one for the
52  * inode core, and possibly one for the inode data/extents/b-tree root
53  * and one for the inode attribute data/extents/b-tree root.
54  */
55 STATIC uint
56 xfs_inode_item_size(
57         xfs_inode_log_item_t    *iip)
58 {
59         uint            nvecs;
60         xfs_inode_t     *ip;
61
62         ip = iip->ili_inode;
63         nvecs = 2;
64
65         /*
66          * Only log the data/extents/b-tree root if there is something
67          * left to log.
68          */
69         iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
70
71         switch (ip->i_d.di_format) {
72         case XFS_DINODE_FMT_EXTENTS:
73                 iip->ili_format.ilf_fields &=
74                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
75                           XFS_ILOG_DEV | XFS_ILOG_UUID);
76                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DEXT) &&
77                     (ip->i_d.di_nextents > 0) &&
78                     (ip->i_df.if_bytes > 0)) {
79                         ASSERT(ip->i_df.if_u1.if_extents != NULL);
80                         nvecs++;
81                 } else {
82                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DEXT;
83                 }
84                 break;
85
86         case XFS_DINODE_FMT_BTREE:
87                 ASSERT(ip->i_df.if_ext_max ==
88                        XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
89                 iip->ili_format.ilf_fields &=
90                         ~(XFS_ILOG_DDATA | XFS_ILOG_DEXT |
91                           XFS_ILOG_DEV | XFS_ILOG_UUID);
92                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) &&
93                     (ip->i_df.if_broot_bytes > 0)) {
94                         ASSERT(ip->i_df.if_broot != NULL);
95                         nvecs++;
96                 } else {
97                         ASSERT(!(iip->ili_format.ilf_fields &
98                                  XFS_ILOG_DBROOT));
99 #ifdef XFS_TRANS_DEBUG
100                         if (iip->ili_root_size > 0) {
101                                 ASSERT(iip->ili_root_size ==
102                                        ip->i_df.if_broot_bytes);
103                                 ASSERT(memcmp(iip->ili_orig_root,
104                                             ip->i_df.if_broot,
105                                             iip->ili_root_size) == 0);
106                         } else {
107                                 ASSERT(ip->i_df.if_broot_bytes == 0);
108                         }
109 #endif
110                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DBROOT;
111                 }
112                 break;
113
114         case XFS_DINODE_FMT_LOCAL:
115                 iip->ili_format.ilf_fields &=
116                         ~(XFS_ILOG_DEXT | XFS_ILOG_DBROOT |
117                           XFS_ILOG_DEV | XFS_ILOG_UUID);
118                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DDATA) &&
119                     (ip->i_df.if_bytes > 0)) {
120                         ASSERT(ip->i_df.if_u1.if_data != NULL);
121                         ASSERT(ip->i_d.di_size > 0);
122                         nvecs++;
123                 } else {
124                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DDATA;
125                 }
126                 break;
127
128         case XFS_DINODE_FMT_DEV:
129                 iip->ili_format.ilf_fields &=
130                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
131                           XFS_ILOG_DEXT | XFS_ILOG_UUID);
132                 break;
133
134         case XFS_DINODE_FMT_UUID:
135                 iip->ili_format.ilf_fields &=
136                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
137                           XFS_ILOG_DEXT | XFS_ILOG_DEV);
138                 break;
139
140         default:
141                 ASSERT(0);
142                 break;
143         }
144
145         /*
146          * If there are no attributes associated with this file,
147          * then there cannot be anything more to log.
148          * Clear all attribute-related log flags.
149          */
150         if (!XFS_IFORK_Q(ip)) {
151                 iip->ili_format.ilf_fields &=
152                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT);
153                 return nvecs;
154         }
155
156         /*
157          * Log any necessary attribute data.
158          */
159         switch (ip->i_d.di_aformat) {
160         case XFS_DINODE_FMT_EXTENTS:
161                 iip->ili_format.ilf_fields &=
162                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT);
163                 if ((iip->ili_format.ilf_fields & XFS_ILOG_AEXT) &&
164                     (ip->i_d.di_anextents > 0) &&
165                     (ip->i_afp->if_bytes > 0)) {
166                         ASSERT(ip->i_afp->if_u1.if_extents != NULL);
167                         nvecs++;
168                 } else {
169                         iip->ili_format.ilf_fields &= ~XFS_ILOG_AEXT;
170                 }
171                 break;
172
173         case XFS_DINODE_FMT_BTREE:
174                 iip->ili_format.ilf_fields &=
175                         ~(XFS_ILOG_ADATA | XFS_ILOG_AEXT);
176                 if ((iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) &&
177                     (ip->i_afp->if_broot_bytes > 0)) {
178                         ASSERT(ip->i_afp->if_broot != NULL);
179                         nvecs++;
180                 } else {
181                         iip->ili_format.ilf_fields &= ~XFS_ILOG_ABROOT;
182                 }
183                 break;
184
185         case XFS_DINODE_FMT_LOCAL:
186                 iip->ili_format.ilf_fields &=
187                         ~(XFS_ILOG_AEXT | XFS_ILOG_ABROOT);
188                 if ((iip->ili_format.ilf_fields & XFS_ILOG_ADATA) &&
189                     (ip->i_afp->if_bytes > 0)) {
190                         ASSERT(ip->i_afp->if_u1.if_data != NULL);
191                         nvecs++;
192                 } else {
193                         iip->ili_format.ilf_fields &= ~XFS_ILOG_ADATA;
194                 }
195                 break;
196
197         default:
198                 ASSERT(0);
199                 break;
200         }
201
202         return nvecs;
203 }
204
205 /*
206  * This is called to fill in the vector of log iovecs for the
207  * given inode log item.  It fills the first item with an inode
208  * log format structure, the second with the on-disk inode structure,
209  * and a possible third and/or fourth with the inode data/extents/b-tree
210  * root and inode attributes data/extents/b-tree root.
211  */
212 STATIC void
213 xfs_inode_item_format(
214         xfs_inode_log_item_t    *iip,
215         xfs_log_iovec_t         *log_vector)
216 {
217         uint                    nvecs;
218         xfs_log_iovec_t         *vecp;
219         xfs_inode_t             *ip;
220         size_t                  data_bytes;
221         xfs_bmbt_rec_t          *ext_buffer;
222         int                     nrecs;
223         xfs_mount_t             *mp;
224
225         ip = iip->ili_inode;
226         vecp = log_vector;
227
228         vecp->i_addr = (xfs_caddr_t)&iip->ili_format;
229         vecp->i_len  = sizeof(xfs_inode_log_format_t);
230         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IFORMAT);
231         vecp++;
232         nvecs        = 1;
233
234         /*
235          * Clear i_update_core if the timestamps (or any other
236          * non-transactional modification) need flushing/logging
237          * and we're about to log them with the rest of the core.
238          *
239          * This is the same logic as xfs_iflush() but this code can't
240          * run at the same time as xfs_iflush because we're in commit
241          * processing here and so we have the inode lock held in
242          * exclusive mode.  Although it doesn't really matter
243          * for the timestamps if both routines were to grab the
244          * timestamps or not.  That would be ok.
245          *
246          * We clear i_update_core before copying out the data.
247          * This is for coordination with our timestamp updates
248          * that don't hold the inode lock. They will always
249          * update the timestamps BEFORE setting i_update_core,
250          * so if we clear i_update_core after they set it we
251          * are guaranteed to see their updates to the timestamps
252          * either here.  Likewise, if they set it after we clear it
253          * here, we'll see it either on the next commit of this
254          * inode or the next time the inode gets flushed via
255          * xfs_iflush().  This depends on strongly ordered memory
256          * semantics, but we have that.  We use the SYNCHRONIZE
257          * macro to make sure that the compiler does not reorder
258          * the i_update_core access below the data copy below.
259          */
260         if (ip->i_update_core)  {
261                 ip->i_update_core = 0;
262                 SYNCHRONIZE();
263         }
264
265         /*
266          * We don't have to worry about re-ordering here because
267          * the update_size field is protected by the inode lock
268          * and we have that held in exclusive mode.
269          */
270         if (ip->i_update_size)
271                 ip->i_update_size = 0;
272
273         /*
274          * Make sure to get the latest atime from the Linux inode.
275          */
276         xfs_synchronize_atime(ip);
277
278         /*
279          * make sure the linux inode is dirty
280          */
281         xfs_mark_inode_dirty_sync(ip);
282
283         vecp->i_addr = (xfs_caddr_t)&ip->i_d;
284         vecp->i_len  = sizeof(xfs_dinode_core_t);
285         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ICORE);
286         vecp++;
287         nvecs++;
288         iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
289
290         /*
291          * If this is really an old format inode, then we need to
292          * log it as such.  This means that we have to copy the link
293          * count from the new field to the old.  We don't have to worry
294          * about the new fields, because nothing trusts them as long as
295          * the old inode version number is there.  If the superblock already
296          * has a new version number, then we don't bother converting back.
297          */
298         mp = ip->i_mount;
299         ASSERT(ip->i_d.di_version == XFS_DINODE_VERSION_1 ||
300                xfs_sb_version_hasnlink(&mp->m_sb));
301         if (ip->i_d.di_version == XFS_DINODE_VERSION_1) {
302                 if (!xfs_sb_version_hasnlink(&mp->m_sb)) {
303                         /*
304                          * Convert it back.
305                          */
306                         ASSERT(ip->i_d.di_nlink <= XFS_MAXLINK_1);
307                         ip->i_d.di_onlink = ip->i_d.di_nlink;
308                 } else {
309                         /*
310                          * The superblock version has already been bumped,
311                          * so just make the conversion to the new inode
312                          * format permanent.
313                          */
314                         ip->i_d.di_version = XFS_DINODE_VERSION_2;
315                         ip->i_d.di_onlink = 0;
316                         memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
317                 }
318         }
319
320         switch (ip->i_d.di_format) {
321         case XFS_DINODE_FMT_EXTENTS:
322                 ASSERT(!(iip->ili_format.ilf_fields &
323                          (XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
324                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
325                 if (iip->ili_format.ilf_fields & XFS_ILOG_DEXT) {
326                         ASSERT(ip->i_df.if_bytes > 0);
327                         ASSERT(ip->i_df.if_u1.if_extents != NULL);
328                         ASSERT(ip->i_d.di_nextents > 0);
329                         ASSERT(iip->ili_extents_buf == NULL);
330                         nrecs = ip->i_df.if_bytes /
331                                 (uint)sizeof(xfs_bmbt_rec_t);
332                         ASSERT(nrecs > 0);
333 #ifdef XFS_NATIVE_HOST
334                         if (nrecs == ip->i_d.di_nextents) {
335                                 /*
336                                  * There are no delayed allocation
337                                  * extents, so just point to the
338                                  * real extents array.
339                                  */
340                                 vecp->i_addr =
341                                         (char *)(ip->i_df.if_u1.if_extents);
342                                 vecp->i_len = ip->i_df.if_bytes;
343                                 XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IEXT);
344                         } else
345 #endif
346                         {
347                                 /*
348                                  * There are delayed allocation extents
349                                  * in the inode, or we need to convert
350                                  * the extents to on disk format.
351                                  * Use xfs_iextents_copy()
352                                  * to copy only the real extents into
353                                  * a separate buffer.  We'll free the
354                                  * buffer in the unlock routine.
355                                  */
356                                 ext_buffer = kmem_alloc(ip->i_df.if_bytes,
357                                         KM_SLEEP);
358                                 iip->ili_extents_buf = ext_buffer;
359                                 vecp->i_addr = (xfs_caddr_t)ext_buffer;
360                                 vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
361                                                 XFS_DATA_FORK);
362                                 XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IEXT);
363                         }
364                         ASSERT(vecp->i_len <= ip->i_df.if_bytes);
365                         iip->ili_format.ilf_dsize = vecp->i_len;
366                         vecp++;
367                         nvecs++;
368                 }
369                 break;
370
371         case XFS_DINODE_FMT_BTREE:
372                 ASSERT(!(iip->ili_format.ilf_fields &
373                          (XFS_ILOG_DDATA | XFS_ILOG_DEXT |
374                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
375                 if (iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) {
376                         ASSERT(ip->i_df.if_broot_bytes > 0);
377                         ASSERT(ip->i_df.if_broot != NULL);
378                         vecp->i_addr = (xfs_caddr_t)ip->i_df.if_broot;
379                         vecp->i_len = ip->i_df.if_broot_bytes;
380                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IBROOT);
381                         vecp++;
382                         nvecs++;
383                         iip->ili_format.ilf_dsize = ip->i_df.if_broot_bytes;
384                 }
385                 break;
386
387         case XFS_DINODE_FMT_LOCAL:
388                 ASSERT(!(iip->ili_format.ilf_fields &
389                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
390                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
391                 if (iip->ili_format.ilf_fields & XFS_ILOG_DDATA) {
392                         ASSERT(ip->i_df.if_bytes > 0);
393                         ASSERT(ip->i_df.if_u1.if_data != NULL);
394                         ASSERT(ip->i_d.di_size > 0);
395
396                         vecp->i_addr = (xfs_caddr_t)ip->i_df.if_u1.if_data;
397                         /*
398                          * Round i_bytes up to a word boundary.
399                          * The underlying memory is guaranteed to
400                          * to be there by xfs_idata_realloc().
401                          */
402                         data_bytes = roundup(ip->i_df.if_bytes, 4);
403                         ASSERT((ip->i_df.if_real_bytes == 0) ||
404                                (ip->i_df.if_real_bytes == data_bytes));
405                         vecp->i_len = (int)data_bytes;
406                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ILOCAL);
407                         vecp++;
408                         nvecs++;
409                         iip->ili_format.ilf_dsize = (unsigned)data_bytes;
410                 }
411                 break;
412
413         case XFS_DINODE_FMT_DEV:
414                 ASSERT(!(iip->ili_format.ilf_fields &
415                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
416                           XFS_ILOG_DDATA | XFS_ILOG_UUID)));
417                 if (iip->ili_format.ilf_fields & XFS_ILOG_DEV) {
418                         iip->ili_format.ilf_u.ilfu_rdev =
419                                 ip->i_df.if_u2.if_rdev;
420                 }
421                 break;
422
423         case XFS_DINODE_FMT_UUID:
424                 ASSERT(!(iip->ili_format.ilf_fields &
425                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
426                           XFS_ILOG_DDATA | XFS_ILOG_DEV)));
427                 if (iip->ili_format.ilf_fields & XFS_ILOG_UUID) {
428                         iip->ili_format.ilf_u.ilfu_uuid =
429                                 ip->i_df.if_u2.if_uuid;
430                 }
431                 break;
432
433         default:
434                 ASSERT(0);
435                 break;
436         }
437
438         /*
439          * If there are no attributes associated with the file,
440          * then we're done.
441          * Assert that no attribute-related log flags are set.
442          */
443         if (!XFS_IFORK_Q(ip)) {
444                 ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
445                 iip->ili_format.ilf_size = nvecs;
446                 ASSERT(!(iip->ili_format.ilf_fields &
447                          (XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
448                 return;
449         }
450
451         switch (ip->i_d.di_aformat) {
452         case XFS_DINODE_FMT_EXTENTS:
453                 ASSERT(!(iip->ili_format.ilf_fields &
454                          (XFS_ILOG_ADATA | XFS_ILOG_ABROOT)));
455                 if (iip->ili_format.ilf_fields & XFS_ILOG_AEXT) {
456                         ASSERT(ip->i_afp->if_bytes > 0);
457                         ASSERT(ip->i_afp->if_u1.if_extents != NULL);
458                         ASSERT(ip->i_d.di_anextents > 0);
459 #ifdef DEBUG
460                         nrecs = ip->i_afp->if_bytes /
461                                 (uint)sizeof(xfs_bmbt_rec_t);
462 #endif
463                         ASSERT(nrecs > 0);
464                         ASSERT(nrecs == ip->i_d.di_anextents);
465 #ifdef XFS_NATIVE_HOST
466                         /*
467                          * There are not delayed allocation extents
468                          * for attributes, so just point at the array.
469                          */
470                         vecp->i_addr = (char *)(ip->i_afp->if_u1.if_extents);
471                         vecp->i_len = ip->i_afp->if_bytes;
472 #else
473                         ASSERT(iip->ili_aextents_buf == NULL);
474                         /*
475                          * Need to endian flip before logging
476                          */
477                         ext_buffer = kmem_alloc(ip->i_afp->if_bytes,
478                                 KM_SLEEP);
479                         iip->ili_aextents_buf = ext_buffer;
480                         vecp->i_addr = (xfs_caddr_t)ext_buffer;
481                         vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
482                                         XFS_ATTR_FORK);
483 #endif
484                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_EXT);
485                         iip->ili_format.ilf_asize = vecp->i_len;
486                         vecp++;
487                         nvecs++;
488                 }
489                 break;
490
491         case XFS_DINODE_FMT_BTREE:
492                 ASSERT(!(iip->ili_format.ilf_fields &
493                          (XFS_ILOG_ADATA | XFS_ILOG_AEXT)));
494                 if (iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) {
495                         ASSERT(ip->i_afp->if_broot_bytes > 0);
496                         ASSERT(ip->i_afp->if_broot != NULL);
497                         vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_broot;
498                         vecp->i_len = ip->i_afp->if_broot_bytes;
499                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_BROOT);
500                         vecp++;
501                         nvecs++;
502                         iip->ili_format.ilf_asize = ip->i_afp->if_broot_bytes;
503                 }
504                 break;
505
506         case XFS_DINODE_FMT_LOCAL:
507                 ASSERT(!(iip->ili_format.ilf_fields &
508                          (XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
509                 if (iip->ili_format.ilf_fields & XFS_ILOG_ADATA) {
510                         ASSERT(ip->i_afp->if_bytes > 0);
511                         ASSERT(ip->i_afp->if_u1.if_data != NULL);
512
513                         vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_u1.if_data;
514                         /*
515                          * Round i_bytes up to a word boundary.
516                          * The underlying memory is guaranteed to
517                          * to be there by xfs_idata_realloc().
518                          */
519                         data_bytes = roundup(ip->i_afp->if_bytes, 4);
520                         ASSERT((ip->i_afp->if_real_bytes == 0) ||
521                                (ip->i_afp->if_real_bytes == data_bytes));
522                         vecp->i_len = (int)data_bytes;
523                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_LOCAL);
524                         vecp++;
525                         nvecs++;
526                         iip->ili_format.ilf_asize = (unsigned)data_bytes;
527                 }
528                 break;
529
530         default:
531                 ASSERT(0);
532                 break;
533         }
534
535         ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
536         iip->ili_format.ilf_size = nvecs;
537 }
538
539
540 /*
541  * This is called to pin the inode associated with the inode log
542  * item in memory so it cannot be written out.  Do this by calling
543  * xfs_ipin() to bump the pin count in the inode while holding the
544  * inode pin lock.
545  */
546 STATIC void
547 xfs_inode_item_pin(
548         xfs_inode_log_item_t    *iip)
549 {
550         ASSERT(xfs_isilocked(iip->ili_inode, XFS_ILOCK_EXCL));
551         xfs_ipin(iip->ili_inode);
552 }
553
554
555 /*
556  * This is called to unpin the inode associated with the inode log
557  * item which was previously pinned with a call to xfs_inode_item_pin().
558  * Just call xfs_iunpin() on the inode to do this.
559  */
560 /* ARGSUSED */
561 STATIC void
562 xfs_inode_item_unpin(
563         xfs_inode_log_item_t    *iip,
564         int                     stale)
565 {
566         xfs_iunpin(iip->ili_inode);
567 }
568
569 /* ARGSUSED */
570 STATIC void
571 xfs_inode_item_unpin_remove(
572         xfs_inode_log_item_t    *iip,
573         xfs_trans_t             *tp)
574 {
575         xfs_iunpin(iip->ili_inode);
576 }
577
578 /*
579  * This is called to attempt to lock the inode associated with this
580  * inode log item, in preparation for the push routine which does the actual
581  * iflush.  Don't sleep on the inode lock or the flush lock.
582  *
583  * If the flush lock is already held, indicating that the inode has
584  * been or is in the process of being flushed, then (ideally) we'd like to
585  * see if the inode's buffer is still incore, and if so give it a nudge.
586  * We delay doing so until the pushbuf routine, though, to avoid holding
587  * the AIL lock across a call to the blackhole which is the buffer cache.
588  * Also we don't want to sleep in any device strategy routines, which can happen
589  * if we do the subsequent bawrite in here.
590  */
591 STATIC uint
592 xfs_inode_item_trylock(
593         xfs_inode_log_item_t    *iip)
594 {
595         register xfs_inode_t    *ip;
596
597         ip = iip->ili_inode;
598
599         if (xfs_ipincount(ip) > 0) {
600                 return XFS_ITEM_PINNED;
601         }
602
603         if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
604                 return XFS_ITEM_LOCKED;
605         }
606
607         if (!xfs_iflock_nowait(ip)) {
608                 /*
609                  * If someone else isn't already trying to push the inode
610                  * buffer, we get to do it.
611                  */
612                 if (iip->ili_pushbuf_flag == 0) {
613                         iip->ili_pushbuf_flag = 1;
614 #ifdef DEBUG
615                         iip->ili_push_owner = current_pid();
616 #endif
617                         /*
618                          * Inode is left locked in shared mode.
619                          * Pushbuf routine gets to unlock it.
620                          */
621                         return XFS_ITEM_PUSHBUF;
622                 } else {
623                         /*
624                          * We hold the AIL lock, so we must specify the
625                          * NONOTIFY flag so that we won't double trip.
626                          */
627                         xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
628                         return XFS_ITEM_FLUSHING;
629                 }
630                 /* NOTREACHED */
631         }
632
633         /* Stale items should force out the iclog */
634         if (ip->i_flags & XFS_ISTALE) {
635                 xfs_ifunlock(ip);
636                 xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
637                 return XFS_ITEM_PINNED;
638         }
639
640 #ifdef DEBUG
641         if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
642                 ASSERT(iip->ili_format.ilf_fields != 0);
643                 ASSERT(iip->ili_logged == 0);
644                 ASSERT(iip->ili_item.li_flags & XFS_LI_IN_AIL);
645         }
646 #endif
647         return XFS_ITEM_SUCCESS;
648 }
649
650 /*
651  * Unlock the inode associated with the inode log item.
652  * Clear the fields of the inode and inode log item that
653  * are specific to the current transaction.  If the
654  * hold flags is set, do not unlock the inode.
655  */
656 STATIC void
657 xfs_inode_item_unlock(
658         xfs_inode_log_item_t    *iip)
659 {
660         uint            hold;
661         uint            iolocked;
662         uint            lock_flags;
663         xfs_inode_t     *ip;
664
665         ASSERT(iip != NULL);
666         ASSERT(iip->ili_inode->i_itemp != NULL);
667         ASSERT(xfs_isilocked(iip->ili_inode, XFS_ILOCK_EXCL));
668         ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
669                   XFS_ILI_IOLOCKED_EXCL)) ||
670                xfs_isilocked(iip->ili_inode, XFS_IOLOCK_EXCL));
671         ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
672                   XFS_ILI_IOLOCKED_SHARED)) ||
673                xfs_isilocked(iip->ili_inode, XFS_IOLOCK_SHARED));
674         /*
675          * Clear the transaction pointer in the inode.
676          */
677         ip = iip->ili_inode;
678         ip->i_transp = NULL;
679
680         /*
681          * If the inode needed a separate buffer with which to log
682          * its extents, then free it now.
683          */
684         if (iip->ili_extents_buf != NULL) {
685                 ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS);
686                 ASSERT(ip->i_d.di_nextents > 0);
687                 ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_DEXT);
688                 ASSERT(ip->i_df.if_bytes > 0);
689                 kmem_free(iip->ili_extents_buf, ip->i_df.if_bytes);
690                 iip->ili_extents_buf = NULL;
691         }
692         if (iip->ili_aextents_buf != NULL) {
693                 ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS);
694                 ASSERT(ip->i_d.di_anextents > 0);
695                 ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_AEXT);
696                 ASSERT(ip->i_afp->if_bytes > 0);
697                 kmem_free(iip->ili_aextents_buf, ip->i_afp->if_bytes);
698                 iip->ili_aextents_buf = NULL;
699         }
700
701         /*
702          * Figure out if we should unlock the inode or not.
703          */
704         hold = iip->ili_flags & XFS_ILI_HOLD;
705
706         /*
707          * Before clearing out the flags, remember whether we
708          * are holding the inode's IO lock.
709          */
710         iolocked = iip->ili_flags & XFS_ILI_IOLOCKED_ANY;
711
712         /*
713          * Clear out the fields of the inode log item particular
714          * to the current transaction.
715          */
716         iip->ili_ilock_recur = 0;
717         iip->ili_iolock_recur = 0;
718         iip->ili_flags = 0;
719
720         /*
721          * Unlock the inode if XFS_ILI_HOLD was not set.
722          */
723         if (!hold) {
724                 lock_flags = XFS_ILOCK_EXCL;
725                 if (iolocked & XFS_ILI_IOLOCKED_EXCL) {
726                         lock_flags |= XFS_IOLOCK_EXCL;
727                 } else if (iolocked & XFS_ILI_IOLOCKED_SHARED) {
728                         lock_flags |= XFS_IOLOCK_SHARED;
729                 }
730                 xfs_iput(iip->ili_inode, lock_flags);
731         }
732 }
733
734 /*
735  * This is called to find out where the oldest active copy of the
736  * inode log item in the on disk log resides now that the last log
737  * write of it completed at the given lsn.  Since we always re-log
738  * all dirty data in an inode, the latest copy in the on disk log
739  * is the only one that matters.  Therefore, simply return the
740  * given lsn.
741  */
742 /*ARGSUSED*/
743 STATIC xfs_lsn_t
744 xfs_inode_item_committed(
745         xfs_inode_log_item_t    *iip,
746         xfs_lsn_t               lsn)
747 {
748         return (lsn);
749 }
750
751 /*
752  * This gets called by xfs_trans_push_ail(), when IOP_TRYLOCK
753  * failed to get the inode flush lock but did get the inode locked SHARED.
754  * Here we're trying to see if the inode buffer is incore, and if so whether it's
755  * marked delayed write. If that's the case, we'll initiate a bawrite on that
756  * buffer to expedite the process.
757  *
758  * We aren't holding the AIL lock (or the flush lock) when this gets called,
759  * so it is inherently race-y.
760  */
761 STATIC void
762 xfs_inode_item_pushbuf(
763         xfs_inode_log_item_t    *iip)
764 {
765         xfs_inode_t     *ip;
766         xfs_mount_t     *mp;
767         xfs_buf_t       *bp;
768         uint            dopush;
769
770         ip = iip->ili_inode;
771
772         ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED));
773
774         /*
775          * The ili_pushbuf_flag keeps others from
776          * trying to duplicate our effort.
777          */
778         ASSERT(iip->ili_pushbuf_flag != 0);
779         ASSERT(iip->ili_push_owner == current_pid());
780
781         /*
782          * If flushlock isn't locked anymore, chances are that the
783          * inode flush completed and the inode was taken off the AIL.
784          * So, just get out.
785          */
786         if (!issemalocked(&(ip->i_flock)) ||
787             ((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0)) {
788                 iip->ili_pushbuf_flag = 0;
789                 xfs_iunlock(ip, XFS_ILOCK_SHARED);
790                 return;
791         }
792
793         mp = ip->i_mount;
794         bp = xfs_incore(mp->m_ddev_targp, iip->ili_format.ilf_blkno,
795                     iip->ili_format.ilf_len, XFS_INCORE_TRYLOCK);
796
797         if (bp != NULL) {
798                 if (XFS_BUF_ISDELAYWRITE(bp)) {
799                         /*
800                          * We were racing with iflush because we don't hold
801                          * the AIL lock or the flush lock. However, at this point,
802                          * we have the buffer, and we know that it's dirty.
803                          * So, it's possible that iflush raced with us, and
804                          * this item is already taken off the AIL.
805                          * If not, we can flush it async.
806                          */
807                         dopush = ((iip->ili_item.li_flags & XFS_LI_IN_AIL) &&
808                                   issemalocked(&(ip->i_flock)));
809                         iip->ili_pushbuf_flag = 0;
810                         xfs_iunlock(ip, XFS_ILOCK_SHARED);
811                         xfs_buftrace("INODE ITEM PUSH", bp);
812                         if (XFS_BUF_ISPINNED(bp)) {
813                                 xfs_log_force(mp, (xfs_lsn_t)0,
814                                               XFS_LOG_FORCE);
815                         }
816                         if (dopush) {
817                                 int     error;
818                                 error = xfs_bawrite(mp, bp);
819                                 if (error)
820                                         xfs_fs_cmn_err(CE_WARN, mp,
821                 "xfs_inode_item_pushbuf: pushbuf error %d on iip %p, bp %p",
822                                                         error, iip, bp);
823                         } else {
824                                 xfs_buf_relse(bp);
825                         }
826                 } else {
827                         iip->ili_pushbuf_flag = 0;
828                         xfs_iunlock(ip, XFS_ILOCK_SHARED);
829                         xfs_buf_relse(bp);
830                 }
831                 return;
832         }
833         /*
834          * We have to be careful about resetting pushbuf flag too early (above).
835          * Even though in theory we can do it as soon as we have the buflock,
836          * we don't want others to be doing work needlessly. They'll come to
837          * this function thinking that pushing the buffer is their
838          * responsibility only to find that the buffer is still locked by
839          * another doing the same thing
840          */
841         iip->ili_pushbuf_flag = 0;
842         xfs_iunlock(ip, XFS_ILOCK_SHARED);
843         return;
844 }
845
846
847 /*
848  * This is called to asynchronously write the inode associated with this
849  * inode log item out to disk. The inode will already have been locked by
850  * a successful call to xfs_inode_item_trylock().
851  */
852 STATIC void
853 xfs_inode_item_push(
854         xfs_inode_log_item_t    *iip)
855 {
856         xfs_inode_t     *ip;
857
858         ip = iip->ili_inode;
859
860         ASSERT(xfs_isilocked(ip, XFS_ILOCK_SHARED));
861         ASSERT(issemalocked(&(ip->i_flock)));
862         /*
863          * Since we were able to lock the inode's flush lock and
864          * we found it on the AIL, the inode must be dirty.  This
865          * is because the inode is removed from the AIL while still
866          * holding the flush lock in xfs_iflush_done().  Thus, if
867          * we found it in the AIL and were able to obtain the flush
868          * lock without sleeping, then there must not have been
869          * anyone in the process of flushing the inode.
870          */
871         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) ||
872                iip->ili_format.ilf_fields != 0);
873
874         /*
875          * Write out the inode.  The completion routine ('iflush_done') will
876          * pull it from the AIL, mark it clean, unlock the flush lock.
877          */
878         (void) xfs_iflush(ip, XFS_IFLUSH_ASYNC);
879         xfs_iunlock(ip, XFS_ILOCK_SHARED);
880
881         return;
882 }
883
884 /*
885  * XXX rcc - this one really has to do something.  Probably needs
886  * to stamp in a new field in the incore inode.
887  */
888 /* ARGSUSED */
889 STATIC void
890 xfs_inode_item_committing(
891         xfs_inode_log_item_t    *iip,
892         xfs_lsn_t               lsn)
893 {
894         iip->ili_last_lsn = lsn;
895         return;
896 }
897
898 /*
899  * This is the ops vector shared by all buf log items.
900  */
901 static struct xfs_item_ops xfs_inode_item_ops = {
902         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_inode_item_size,
903         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
904                                         xfs_inode_item_format,
905         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_inode_item_pin,
906         .iop_unpin      = (void(*)(xfs_log_item_t*, int))xfs_inode_item_unpin,
907         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
908                                         xfs_inode_item_unpin_remove,
909         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_inode_item_trylock,
910         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_inode_item_unlock,
911         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
912                                         xfs_inode_item_committed,
913         .iop_push       = (void(*)(xfs_log_item_t*))xfs_inode_item_push,
914         .iop_pushbuf    = (void(*)(xfs_log_item_t*))xfs_inode_item_pushbuf,
915         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
916                                         xfs_inode_item_committing
917 };
918
919
920 /*
921  * Initialize the inode log item for a newly allocated (in-core) inode.
922  */
923 void
924 xfs_inode_item_init(
925         xfs_inode_t     *ip,
926         xfs_mount_t     *mp)
927 {
928         xfs_inode_log_item_t    *iip;
929
930         ASSERT(ip->i_itemp == NULL);
931         iip = ip->i_itemp = kmem_zone_zalloc(xfs_ili_zone, KM_SLEEP);
932
933         iip->ili_item.li_type = XFS_LI_INODE;
934         iip->ili_item.li_ops = &xfs_inode_item_ops;
935         iip->ili_item.li_mountp = mp;
936         iip->ili_inode = ip;
937
938         /*
939            We have zeroed memory. No need ...
940            iip->ili_extents_buf = NULL;
941            iip->ili_pushbuf_flag = 0;
942          */
943
944         iip->ili_format.ilf_type = XFS_LI_INODE;
945         iip->ili_format.ilf_ino = ip->i_ino;
946         iip->ili_format.ilf_blkno = ip->i_blkno;
947         iip->ili_format.ilf_len = ip->i_len;
948         iip->ili_format.ilf_boffset = ip->i_boffset;
949 }
950
951 /*
952  * Free the inode log item and any memory hanging off of it.
953  */
954 void
955 xfs_inode_item_destroy(
956         xfs_inode_t     *ip)
957 {
958 #ifdef XFS_TRANS_DEBUG
959         if (ip->i_itemp->ili_root_size != 0) {
960                 kmem_free(ip->i_itemp->ili_orig_root,
961                           ip->i_itemp->ili_root_size);
962         }
963 #endif
964         kmem_zone_free(xfs_ili_zone, ip->i_itemp);
965 }
966
967
968 /*
969  * This is the inode flushing I/O completion routine.  It is called
970  * from interrupt level when the buffer containing the inode is
971  * flushed to disk.  It is responsible for removing the inode item
972  * from the AIL if it has not been re-logged, and unlocking the inode's
973  * flush lock.
974  */
975 /*ARGSUSED*/
976 void
977 xfs_iflush_done(
978         xfs_buf_t               *bp,
979         xfs_inode_log_item_t    *iip)
980 {
981         xfs_inode_t     *ip;
982
983         ip = iip->ili_inode;
984
985         /*
986          * We only want to pull the item from the AIL if it is
987          * actually there and its location in the log has not
988          * changed since we started the flush.  Thus, we only bother
989          * if the ili_logged flag is set and the inode's lsn has not
990          * changed.  First we check the lsn outside
991          * the lock since it's cheaper, and then we recheck while
992          * holding the lock before removing the inode from the AIL.
993          */
994         if (iip->ili_logged &&
995             (iip->ili_item.li_lsn == iip->ili_flush_lsn)) {
996                 spin_lock(&ip->i_mount->m_ail_lock);
997                 if (iip->ili_item.li_lsn == iip->ili_flush_lsn) {
998                         /*
999                          * xfs_trans_delete_ail() drops the AIL lock.
1000                          */
1001                         xfs_trans_delete_ail(ip->i_mount,
1002                                              (xfs_log_item_t*)iip);
1003                 } else {
1004                         spin_unlock(&ip->i_mount->m_ail_lock);
1005                 }
1006         }
1007
1008         iip->ili_logged = 0;
1009
1010         /*
1011          * Clear the ili_last_fields bits now that we know that the
1012          * data corresponding to them is safely on disk.
1013          */
1014         iip->ili_last_fields = 0;
1015
1016         /*
1017          * Release the inode's flush lock since we're done with it.
1018          */
1019         xfs_ifunlock(ip);
1020
1021         return;
1022 }
1023
1024 /*
1025  * This is the inode flushing abort routine.  It is called
1026  * from xfs_iflush when the filesystem is shutting down to clean
1027  * up the inode state.
1028  * It is responsible for removing the inode item
1029  * from the AIL if it has not been re-logged, and unlocking the inode's
1030  * flush lock.
1031  */
1032 void
1033 xfs_iflush_abort(
1034         xfs_inode_t             *ip)
1035 {
1036         xfs_inode_log_item_t    *iip;
1037         xfs_mount_t             *mp;
1038
1039         iip = ip->i_itemp;
1040         mp = ip->i_mount;
1041         if (iip) {
1042                 if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
1043                         spin_lock(&mp->m_ail_lock);
1044                         if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
1045                                 /*
1046                                  * xfs_trans_delete_ail() drops the AIL lock.
1047                                  */
1048                                 xfs_trans_delete_ail(mp, (xfs_log_item_t *)iip);
1049                         } else
1050                                 spin_unlock(&mp->m_ail_lock);
1051                 }
1052                 iip->ili_logged = 0;
1053                 /*
1054                  * Clear the ili_last_fields bits now that we know that the
1055                  * data corresponding to them is safely on disk.
1056                  */
1057                 iip->ili_last_fields = 0;
1058                 /*
1059                  * Clear the inode logging fields so no more flushes are
1060                  * attempted.
1061                  */
1062                 iip->ili_format.ilf_fields = 0;
1063         }
1064         /*
1065          * Release the inode's flush lock since we're done with it.
1066          */
1067         xfs_ifunlock(ip);
1068 }
1069
1070 void
1071 xfs_istale_done(
1072         xfs_buf_t               *bp,
1073         xfs_inode_log_item_t    *iip)
1074 {
1075         xfs_iflush_abort(iip->ili_inode);
1076 }
1077
1078 /*
1079  * convert an xfs_inode_log_format struct from either 32 or 64 bit versions
1080  * (which can have different field alignments) to the native version
1081  */
1082 int
1083 xfs_inode_item_format_convert(
1084         xfs_log_iovec_t         *buf,
1085         xfs_inode_log_format_t  *in_f)
1086 {
1087         if (buf->i_len == sizeof(xfs_inode_log_format_32_t)) {
1088                 xfs_inode_log_format_32_t *in_f32;
1089
1090                 in_f32 = (xfs_inode_log_format_32_t *)buf->i_addr;
1091                 in_f->ilf_type = in_f32->ilf_type;
1092                 in_f->ilf_size = in_f32->ilf_size;
1093                 in_f->ilf_fields = in_f32->ilf_fields;
1094                 in_f->ilf_asize = in_f32->ilf_asize;
1095                 in_f->ilf_dsize = in_f32->ilf_dsize;
1096                 in_f->ilf_ino = in_f32->ilf_ino;
1097                 /* copy biggest field of ilf_u */
1098                 memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
1099                        in_f32->ilf_u.ilfu_uuid.__u_bits,
1100                        sizeof(uuid_t));
1101                 in_f->ilf_blkno = in_f32->ilf_blkno;
1102                 in_f->ilf_len = in_f32->ilf_len;
1103                 in_f->ilf_boffset = in_f32->ilf_boffset;
1104                 return 0;
1105         } else if (buf->i_len == sizeof(xfs_inode_log_format_64_t)){
1106                 xfs_inode_log_format_64_t *in_f64;
1107
1108                 in_f64 = (xfs_inode_log_format_64_t *)buf->i_addr;
1109                 in_f->ilf_type = in_f64->ilf_type;
1110                 in_f->ilf_size = in_f64->ilf_size;
1111                 in_f->ilf_fields = in_f64->ilf_fields;
1112                 in_f->ilf_asize = in_f64->ilf_asize;
1113                 in_f->ilf_dsize = in_f64->ilf_dsize;
1114                 in_f->ilf_ino = in_f64->ilf_ino;
1115                 /* copy biggest field of ilf_u */
1116                 memcpy(in_f->ilf_u.ilfu_uuid.__u_bits,
1117                        in_f64->ilf_u.ilfu_uuid.__u_bits,
1118                        sizeof(uuid_t));
1119                 in_f->ilf_blkno = in_f64->ilf_blkno;
1120                 in_f->ilf_len = in_f64->ilf_len;
1121                 in_f->ilf_boffset = in_f64->ilf_boffset;
1122                 return 0;
1123         }
1124         return EFSCORRUPTED;
1125 }