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