Merge master.kernel.org:/home/rmk/linux-2.6-drvmodel
[linux-2.6] / fs / xfs / xfs_inode_item.c
1 /*
2  * Copyright (c) 2000-2002 Silicon Graphics, Inc.  All Rights Reserved.
3  *
4  * This program is free software; you can redistribute it and/or modify it
5  * under the terms of version 2 of the GNU General Public License as
6  * published by the Free Software Foundation.
7  *
8  * This program is distributed in the hope that it would be useful, but
9  * WITHOUT ANY WARRANTY; without even the implied warranty of
10  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
11  *
12  * Further, this software is distributed without any warranty that it is
13  * free of the rightful claim of any third person regarding infringement
14  * or the like.  Any license provided herein, whether implied or
15  * otherwise, applies only to this software file.  Patent licenses, if
16  * any, provided herein do not apply to combinations of this program with
17  * other software, or any other product whatsoever.
18  *
19  * You should have received a copy of the GNU General Public License along
20  * with this program; if not, write the Free Software Foundation, Inc., 59
21  * Temple Place - Suite 330, Boston MA 02111-1307, USA.
22  *
23  * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy,
24  * Mountain View, CA  94043, or:
25  *
26  * http://www.sgi.com
27  *
28  * For further information regarding this notice, see:
29  *
30  * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/
31  */
32
33 /*
34  * This file contains the implementation of the xfs_inode_log_item.
35  * It contains the item operations used to manipulate the inode log
36  * items as well as utility routines used by the inode specific
37  * transaction routines.
38  */
39 #include "xfs.h"
40 #include "xfs_macros.h"
41 #include "xfs_types.h"
42 #include "xfs_inum.h"
43 #include "xfs_log.h"
44 #include "xfs_trans.h"
45 #include "xfs_buf_item.h"
46 #include "xfs_sb.h"
47 #include "xfs_dir.h"
48 #include "xfs_dir2.h"
49 #include "xfs_dmapi.h"
50 #include "xfs_mount.h"
51 #include "xfs_trans_priv.h"
52 #include "xfs_ag.h"
53 #include "xfs_alloc_btree.h"
54 #include "xfs_bmap_btree.h"
55 #include "xfs_ialloc_btree.h"
56 #include "xfs_btree.h"
57 #include "xfs_ialloc.h"
58 #include "xfs_attr_sf.h"
59 #include "xfs_dir_sf.h"
60 #include "xfs_dir2_sf.h"
61 #include "xfs_dinode.h"
62 #include "xfs_inode_item.h"
63 #include "xfs_inode.h"
64 #include "xfs_rw.h"
65
66
67 kmem_zone_t     *xfs_ili_zone;          /* inode log item zone */
68
69 /*
70  * This returns the number of iovecs needed to log the given inode item.
71  *
72  * We need one iovec for the inode log format structure, one for the
73  * inode core, and possibly one for the inode data/extents/b-tree root
74  * and one for the inode attribute data/extents/b-tree root.
75  */
76 STATIC uint
77 xfs_inode_item_size(
78         xfs_inode_log_item_t    *iip)
79 {
80         uint            nvecs;
81         xfs_inode_t     *ip;
82
83         ip = iip->ili_inode;
84         nvecs = 2;
85
86         /*
87          * Only log the data/extents/b-tree root if there is something
88          * left to log.
89          */
90         iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
91
92         switch (ip->i_d.di_format) {
93         case XFS_DINODE_FMT_EXTENTS:
94                 iip->ili_format.ilf_fields &=
95                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
96                           XFS_ILOG_DEV | XFS_ILOG_UUID);
97                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DEXT) &&
98                     (ip->i_d.di_nextents > 0) &&
99                     (ip->i_df.if_bytes > 0)) {
100                         ASSERT(ip->i_df.if_u1.if_extents != NULL);
101                         nvecs++;
102                 } else {
103                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DEXT;
104                 }
105                 break;
106
107         case XFS_DINODE_FMT_BTREE:
108                 ASSERT(ip->i_df.if_ext_max ==
109                        XFS_IFORK_DSIZE(ip) / (uint)sizeof(xfs_bmbt_rec_t));
110                 iip->ili_format.ilf_fields &=
111                         ~(XFS_ILOG_DDATA | XFS_ILOG_DEXT |
112                           XFS_ILOG_DEV | XFS_ILOG_UUID);
113                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) &&
114                     (ip->i_df.if_broot_bytes > 0)) {
115                         ASSERT(ip->i_df.if_broot != NULL);
116                         nvecs++;
117                 } else {
118                         ASSERT(!(iip->ili_format.ilf_fields &
119                                  XFS_ILOG_DBROOT));
120 #ifdef XFS_TRANS_DEBUG
121                         if (iip->ili_root_size > 0) {
122                                 ASSERT(iip->ili_root_size ==
123                                        ip->i_df.if_broot_bytes);
124                                 ASSERT(memcmp(iip->ili_orig_root,
125                                             ip->i_df.if_broot,
126                                             iip->ili_root_size) == 0);
127                         } else {
128                                 ASSERT(ip->i_df.if_broot_bytes == 0);
129                         }
130 #endif
131                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DBROOT;
132                 }
133                 break;
134
135         case XFS_DINODE_FMT_LOCAL:
136                 iip->ili_format.ilf_fields &=
137                         ~(XFS_ILOG_DEXT | XFS_ILOG_DBROOT |
138                           XFS_ILOG_DEV | XFS_ILOG_UUID);
139                 if ((iip->ili_format.ilf_fields & XFS_ILOG_DDATA) &&
140                     (ip->i_df.if_bytes > 0)) {
141                         ASSERT(ip->i_df.if_u1.if_data != NULL);
142                         ASSERT(ip->i_d.di_size > 0);
143                         nvecs++;
144                 } else {
145                         iip->ili_format.ilf_fields &= ~XFS_ILOG_DDATA;
146                 }
147                 break;
148
149         case XFS_DINODE_FMT_DEV:
150                 iip->ili_format.ilf_fields &=
151                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
152                           XFS_ILOG_DEXT | XFS_ILOG_UUID);
153                 break;
154
155         case XFS_DINODE_FMT_UUID:
156                 iip->ili_format.ilf_fields &=
157                         ~(XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
158                           XFS_ILOG_DEXT | XFS_ILOG_DEV);
159                 break;
160
161         default:
162                 ASSERT(0);
163                 break;
164         }
165
166         /*
167          * If there are no attributes associated with this file,
168          * then there cannot be anything more to log.
169          * Clear all attribute-related log flags.
170          */
171         if (!XFS_IFORK_Q(ip)) {
172                 iip->ili_format.ilf_fields &=
173                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT);
174                 return nvecs;
175         }
176
177         /*
178          * Log any necessary attribute data.
179          */
180         switch (ip->i_d.di_aformat) {
181         case XFS_DINODE_FMT_EXTENTS:
182                 iip->ili_format.ilf_fields &=
183                         ~(XFS_ILOG_ADATA | XFS_ILOG_ABROOT);
184                 if ((iip->ili_format.ilf_fields & XFS_ILOG_AEXT) &&
185                     (ip->i_d.di_anextents > 0) &&
186                     (ip->i_afp->if_bytes > 0)) {
187                         ASSERT(ip->i_afp->if_u1.if_extents != NULL);
188                         nvecs++;
189                 } else {
190                         iip->ili_format.ilf_fields &= ~XFS_ILOG_AEXT;
191                 }
192                 break;
193
194         case XFS_DINODE_FMT_BTREE:
195                 iip->ili_format.ilf_fields &=
196                         ~(XFS_ILOG_ADATA | XFS_ILOG_AEXT);
197                 if ((iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) &&
198                     (ip->i_afp->if_broot_bytes > 0)) {
199                         ASSERT(ip->i_afp->if_broot != NULL);
200                         nvecs++;
201                 } else {
202                         iip->ili_format.ilf_fields &= ~XFS_ILOG_ABROOT;
203                 }
204                 break;
205
206         case XFS_DINODE_FMT_LOCAL:
207                 iip->ili_format.ilf_fields &=
208                         ~(XFS_ILOG_AEXT | XFS_ILOG_ABROOT);
209                 if ((iip->ili_format.ilf_fields & XFS_ILOG_ADATA) &&
210                     (ip->i_afp->if_bytes > 0)) {
211                         ASSERT(ip->i_afp->if_u1.if_data != NULL);
212                         nvecs++;
213                 } else {
214                         iip->ili_format.ilf_fields &= ~XFS_ILOG_ADATA;
215                 }
216                 break;
217
218         default:
219                 ASSERT(0);
220                 break;
221         }
222
223         return nvecs;
224 }
225
226 /*
227  * This is called to fill in the vector of log iovecs for the
228  * given inode log item.  It fills the first item with an inode
229  * log format structure, the second with the on-disk inode structure,
230  * and a possible third and/or fourth with the inode data/extents/b-tree
231  * root and inode attributes data/extents/b-tree root.
232  */
233 STATIC void
234 xfs_inode_item_format(
235         xfs_inode_log_item_t    *iip,
236         xfs_log_iovec_t         *log_vector)
237 {
238         uint                    nvecs;
239         xfs_log_iovec_t         *vecp;
240         xfs_inode_t             *ip;
241         size_t                  data_bytes;
242         xfs_bmbt_rec_t          *ext_buffer;
243         int                     nrecs;
244         xfs_mount_t             *mp;
245
246         ip = iip->ili_inode;
247         vecp = log_vector;
248
249         vecp->i_addr = (xfs_caddr_t)&iip->ili_format;
250         vecp->i_len  = sizeof(xfs_inode_log_format_t);
251         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IFORMAT);
252         vecp++;
253         nvecs        = 1;
254
255         /*
256          * Clear i_update_core if the timestamps (or any other
257          * non-transactional modification) need flushing/logging
258          * and we're about to log them with the rest of the core.
259          *
260          * This is the same logic as xfs_iflush() but this code can't
261          * run at the same time as xfs_iflush because we're in commit
262          * processing here and so we have the inode lock held in
263          * exclusive mode.  Although it doesn't really matter
264          * for the timestamps if both routines were to grab the
265          * timestamps or not.  That would be ok.
266          *
267          * We clear i_update_core before copying out the data.
268          * This is for coordination with our timestamp updates
269          * that don't hold the inode lock. They will always
270          * update the timestamps BEFORE setting i_update_core,
271          * so if we clear i_update_core after they set it we
272          * are guaranteed to see their updates to the timestamps
273          * either here.  Likewise, if they set it after we clear it
274          * here, we'll see it either on the next commit of this
275          * inode or the next time the inode gets flushed via
276          * xfs_iflush().  This depends on strongly ordered memory
277          * semantics, but we have that.  We use the SYNCHRONIZE
278          * macro to make sure that the compiler does not reorder
279          * the i_update_core access below the data copy below.
280          */
281         if (ip->i_update_core)  {
282                 ip->i_update_core = 0;
283                 SYNCHRONIZE();
284         }
285
286         /*
287          * We don't have to worry about re-ordering here because
288          * the update_size field is protected by the inode lock
289          * and we have that held in exclusive mode.
290          */
291         if (ip->i_update_size)
292                 ip->i_update_size = 0;
293
294         vecp->i_addr = (xfs_caddr_t)&ip->i_d;
295         vecp->i_len  = sizeof(xfs_dinode_core_t);
296         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ICORE);
297         vecp++;
298         nvecs++;
299         iip->ili_format.ilf_fields |= XFS_ILOG_CORE;
300
301         /*
302          * If this is really an old format inode, then we need to
303          * log it as such.  This means that we have to copy the link
304          * count from the new field to the old.  We don't have to worry
305          * about the new fields, because nothing trusts them as long as
306          * the old inode version number is there.  If the superblock already
307          * has a new version number, then we don't bother converting back.
308          */
309         mp = ip->i_mount;
310         ASSERT(ip->i_d.di_version == XFS_DINODE_VERSION_1 ||
311                XFS_SB_VERSION_HASNLINK(&mp->m_sb));
312         if (ip->i_d.di_version == XFS_DINODE_VERSION_1) {
313                 if (!XFS_SB_VERSION_HASNLINK(&mp->m_sb)) {
314                         /*
315                          * Convert it back.
316                          */
317                         ASSERT(ip->i_d.di_nlink <= XFS_MAXLINK_1);
318                         ip->i_d.di_onlink = ip->i_d.di_nlink;
319                 } else {
320                         /*
321                          * The superblock version has already been bumped,
322                          * so just make the conversion to the new inode
323                          * format permanent.
324                          */
325                         ip->i_d.di_version = XFS_DINODE_VERSION_2;
326                         ip->i_d.di_onlink = 0;
327                         memset(&(ip->i_d.di_pad[0]), 0, sizeof(ip->i_d.di_pad));
328                 }
329         }
330
331         switch (ip->i_d.di_format) {
332         case XFS_DINODE_FMT_EXTENTS:
333                 ASSERT(!(iip->ili_format.ilf_fields &
334                          (XFS_ILOG_DDATA | XFS_ILOG_DBROOT |
335                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
336                 if (iip->ili_format.ilf_fields & XFS_ILOG_DEXT) {
337                         ASSERT(ip->i_df.if_bytes > 0);
338                         ASSERT(ip->i_df.if_u1.if_extents != NULL);
339                         ASSERT(ip->i_d.di_nextents > 0);
340                         ASSERT(iip->ili_extents_buf == NULL);
341                         nrecs = ip->i_df.if_bytes /
342                                 (uint)sizeof(xfs_bmbt_rec_t);
343                         ASSERT(nrecs > 0);
344 #ifdef XFS_NATIVE_HOST
345                         if (nrecs == ip->i_d.di_nextents) {
346                                 /*
347                                  * There are no delayed allocation
348                                  * extents, so just point to the
349                                  * real extents array.
350                                  */
351                                 vecp->i_addr =
352                                         (char *)(ip->i_df.if_u1.if_extents);
353                                 vecp->i_len = ip->i_df.if_bytes;
354                                 XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IEXT);
355                         } else
356 #endif
357                         {
358                                 /*
359                                  * There are delayed allocation extents
360                                  * in the inode, or we need to convert
361                                  * the extents to on disk format.
362                                  * Use xfs_iextents_copy()
363                                  * to copy only the real extents into
364                                  * a separate buffer.  We'll free the
365                                  * buffer in the unlock routine.
366                                  */
367                                 ext_buffer = kmem_alloc(ip->i_df.if_bytes,
368                                         KM_SLEEP);
369                                 iip->ili_extents_buf = ext_buffer;
370                                 vecp->i_addr = (xfs_caddr_t)ext_buffer;
371                                 vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
372                                                 XFS_DATA_FORK);
373                                 XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IEXT);
374                         }
375                         ASSERT(vecp->i_len <= ip->i_df.if_bytes);
376                         iip->ili_format.ilf_dsize = vecp->i_len;
377                         vecp++;
378                         nvecs++;
379                 }
380                 break;
381
382         case XFS_DINODE_FMT_BTREE:
383                 ASSERT(!(iip->ili_format.ilf_fields &
384                          (XFS_ILOG_DDATA | XFS_ILOG_DEXT |
385                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
386                 if (iip->ili_format.ilf_fields & XFS_ILOG_DBROOT) {
387                         ASSERT(ip->i_df.if_broot_bytes > 0);
388                         ASSERT(ip->i_df.if_broot != NULL);
389                         vecp->i_addr = (xfs_caddr_t)ip->i_df.if_broot;
390                         vecp->i_len = ip->i_df.if_broot_bytes;
391                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IBROOT);
392                         vecp++;
393                         nvecs++;
394                         iip->ili_format.ilf_dsize = ip->i_df.if_broot_bytes;
395                 }
396                 break;
397
398         case XFS_DINODE_FMT_LOCAL:
399                 ASSERT(!(iip->ili_format.ilf_fields &
400                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
401                           XFS_ILOG_DEV | XFS_ILOG_UUID)));
402                 if (iip->ili_format.ilf_fields & XFS_ILOG_DDATA) {
403                         ASSERT(ip->i_df.if_bytes > 0);
404                         ASSERT(ip->i_df.if_u1.if_data != NULL);
405                         ASSERT(ip->i_d.di_size > 0);
406
407                         vecp->i_addr = (xfs_caddr_t)ip->i_df.if_u1.if_data;
408                         /*
409                          * Round i_bytes up to a word boundary.
410                          * The underlying memory is guaranteed to
411                          * to be there by xfs_idata_realloc().
412                          */
413                         data_bytes = roundup(ip->i_df.if_bytes, 4);
414                         ASSERT((ip->i_df.if_real_bytes == 0) ||
415                                (ip->i_df.if_real_bytes == data_bytes));
416                         vecp->i_len = (int)data_bytes;
417                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_ILOCAL);
418                         vecp++;
419                         nvecs++;
420                         iip->ili_format.ilf_dsize = (unsigned)data_bytes;
421                 }
422                 break;
423
424         case XFS_DINODE_FMT_DEV:
425                 ASSERT(!(iip->ili_format.ilf_fields &
426                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
427                           XFS_ILOG_DDATA | XFS_ILOG_UUID)));
428                 if (iip->ili_format.ilf_fields & XFS_ILOG_DEV) {
429                         iip->ili_format.ilf_u.ilfu_rdev =
430                                 ip->i_df.if_u2.if_rdev;
431                 }
432                 break;
433
434         case XFS_DINODE_FMT_UUID:
435                 ASSERT(!(iip->ili_format.ilf_fields &
436                          (XFS_ILOG_DBROOT | XFS_ILOG_DEXT |
437                           XFS_ILOG_DDATA | XFS_ILOG_DEV)));
438                 if (iip->ili_format.ilf_fields & XFS_ILOG_UUID) {
439                         iip->ili_format.ilf_u.ilfu_uuid =
440                                 ip->i_df.if_u2.if_uuid;
441                 }
442                 break;
443
444         default:
445                 ASSERT(0);
446                 break;
447         }
448
449         /*
450          * If there are no attributes associated with the file,
451          * then we're done.
452          * Assert that no attribute-related log flags are set.
453          */
454         if (!XFS_IFORK_Q(ip)) {
455                 ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
456                 iip->ili_format.ilf_size = nvecs;
457                 ASSERT(!(iip->ili_format.ilf_fields &
458                          (XFS_ILOG_ADATA | XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
459                 return;
460         }
461
462         switch (ip->i_d.di_aformat) {
463         case XFS_DINODE_FMT_EXTENTS:
464                 ASSERT(!(iip->ili_format.ilf_fields &
465                          (XFS_ILOG_ADATA | XFS_ILOG_ABROOT)));
466                 if (iip->ili_format.ilf_fields & XFS_ILOG_AEXT) {
467                         ASSERT(ip->i_afp->if_bytes > 0);
468                         ASSERT(ip->i_afp->if_u1.if_extents != NULL);
469                         ASSERT(ip->i_d.di_anextents > 0);
470 #ifdef DEBUG
471                         nrecs = ip->i_afp->if_bytes /
472                                 (uint)sizeof(xfs_bmbt_rec_t);
473 #endif
474                         ASSERT(nrecs > 0);
475                         ASSERT(nrecs == ip->i_d.di_anextents);
476 #ifdef XFS_NATIVE_HOST
477                         /*
478                          * There are not delayed allocation extents
479                          * for attributes, so just point at the array.
480                          */
481                         vecp->i_addr = (char *)(ip->i_afp->if_u1.if_extents);
482                         vecp->i_len = ip->i_afp->if_bytes;
483 #else
484                         ASSERT(iip->ili_aextents_buf == NULL);
485                         /*
486                          * Need to endian flip before logging
487                          */
488                         ext_buffer = kmem_alloc(ip->i_afp->if_bytes,
489                                 KM_SLEEP);
490                         iip->ili_aextents_buf = ext_buffer;
491                         vecp->i_addr = (xfs_caddr_t)ext_buffer;
492                         vecp->i_len = xfs_iextents_copy(ip, ext_buffer,
493                                         XFS_ATTR_FORK);
494 #endif
495                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_EXT);
496                         iip->ili_format.ilf_asize = vecp->i_len;
497                         vecp++;
498                         nvecs++;
499                 }
500                 break;
501
502         case XFS_DINODE_FMT_BTREE:
503                 ASSERT(!(iip->ili_format.ilf_fields &
504                          (XFS_ILOG_ADATA | XFS_ILOG_AEXT)));
505                 if (iip->ili_format.ilf_fields & XFS_ILOG_ABROOT) {
506                         ASSERT(ip->i_afp->if_broot_bytes > 0);
507                         ASSERT(ip->i_afp->if_broot != NULL);
508                         vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_broot;
509                         vecp->i_len = ip->i_afp->if_broot_bytes;
510                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_BROOT);
511                         vecp++;
512                         nvecs++;
513                         iip->ili_format.ilf_asize = ip->i_afp->if_broot_bytes;
514                 }
515                 break;
516
517         case XFS_DINODE_FMT_LOCAL:
518                 ASSERT(!(iip->ili_format.ilf_fields &
519                          (XFS_ILOG_ABROOT | XFS_ILOG_AEXT)));
520                 if (iip->ili_format.ilf_fields & XFS_ILOG_ADATA) {
521                         ASSERT(ip->i_afp->if_bytes > 0);
522                         ASSERT(ip->i_afp->if_u1.if_data != NULL);
523
524                         vecp->i_addr = (xfs_caddr_t)ip->i_afp->if_u1.if_data;
525                         /*
526                          * Round i_bytes up to a word boundary.
527                          * The underlying memory is guaranteed to
528                          * to be there by xfs_idata_realloc().
529                          */
530                         data_bytes = roundup(ip->i_afp->if_bytes, 4);
531                         ASSERT((ip->i_afp->if_real_bytes == 0) ||
532                                (ip->i_afp->if_real_bytes == data_bytes));
533                         vecp->i_len = (int)data_bytes;
534                         XLOG_VEC_SET_TYPE(vecp, XLOG_REG_TYPE_IATTR_LOCAL);
535                         vecp++;
536                         nvecs++;
537                         iip->ili_format.ilf_asize = (unsigned)data_bytes;
538                 }
539                 break;
540
541         default:
542                 ASSERT(0);
543                 break;
544         }
545
546         ASSERT(nvecs == iip->ili_item.li_desc->lid_size);
547         iip->ili_format.ilf_size = nvecs;
548 }
549
550
551 /*
552  * This is called to pin the inode associated with the inode log
553  * item in memory so it cannot be written out.  Do this by calling
554  * xfs_ipin() to bump the pin count in the inode while holding the
555  * inode pin lock.
556  */
557 STATIC void
558 xfs_inode_item_pin(
559         xfs_inode_log_item_t    *iip)
560 {
561         ASSERT(ismrlocked(&(iip->ili_inode->i_lock), MR_UPDATE));
562         xfs_ipin(iip->ili_inode);
563 }
564
565
566 /*
567  * This is called to unpin the inode associated with the inode log
568  * item which was previously pinned with a call to xfs_inode_item_pin().
569  * Just call xfs_iunpin() on the inode to do this.
570  */
571 /* ARGSUSED */
572 STATIC void
573 xfs_inode_item_unpin(
574         xfs_inode_log_item_t    *iip,
575         int                     stale)
576 {
577         xfs_iunpin(iip->ili_inode);
578 }
579
580 /* ARGSUSED */
581 STATIC void
582 xfs_inode_item_unpin_remove(
583         xfs_inode_log_item_t    *iip,
584         xfs_trans_t             *tp)
585 {
586         xfs_iunpin(iip->ili_inode);
587 }
588
589 /*
590  * This is called to attempt to lock the inode associated with this
591  * inode log item, in preparation for the push routine which does the actual
592  * iflush.  Don't sleep on the inode lock or the flush lock.
593  *
594  * If the flush lock is already held, indicating that the inode has
595  * been or is in the process of being flushed, then (ideally) we'd like to
596  * see if the inode's buffer is still incore, and if so give it a nudge.
597  * We delay doing so until the pushbuf routine, though, to avoid holding
598  * the AIL lock across a call to the blackhole which is the buffercache.
599  * Also we don't want to sleep in any device strategy routines, which can happen
600  * if we do the subsequent bawrite in here.
601  */
602 STATIC uint
603 xfs_inode_item_trylock(
604         xfs_inode_log_item_t    *iip)
605 {
606         register xfs_inode_t    *ip;
607
608         ip = iip->ili_inode;
609
610         if (xfs_ipincount(ip) > 0) {
611                 return XFS_ITEM_PINNED;
612         }
613
614         if (!xfs_ilock_nowait(ip, XFS_ILOCK_SHARED)) {
615                 return XFS_ITEM_LOCKED;
616         }
617
618         if (!xfs_iflock_nowait(ip)) {
619                 /*
620                  * If someone else isn't already trying to push the inode
621                  * buffer, we get to do it.
622                  */
623                 if (iip->ili_pushbuf_flag == 0) {
624                         iip->ili_pushbuf_flag = 1;
625 #ifdef DEBUG
626                         iip->ili_push_owner = get_thread_id();
627 #endif
628                         /*
629                          * Inode is left locked in shared mode.
630                          * Pushbuf routine gets to unlock it.
631                          */
632                         return XFS_ITEM_PUSHBUF;
633                 } else {
634                         /*
635                          * We hold the AIL_LOCK, so we must specify the
636                          * NONOTIFY flag so that we won't double trip.
637                          */
638                         xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
639                         return XFS_ITEM_FLUSHING;
640                 }
641                 /* NOTREACHED */
642         }
643
644         /* Stale items should force out the iclog */
645         if (ip->i_flags & XFS_ISTALE) {
646                 xfs_ifunlock(ip);
647                 xfs_iunlock(ip, XFS_ILOCK_SHARED|XFS_IUNLOCK_NONOTIFY);
648                 return XFS_ITEM_PINNED;
649         }
650
651 #ifdef DEBUG
652         if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
653                 ASSERT(iip->ili_format.ilf_fields != 0);
654                 ASSERT(iip->ili_logged == 0);
655                 ASSERT(iip->ili_item.li_flags & XFS_LI_IN_AIL);
656         }
657 #endif
658         return XFS_ITEM_SUCCESS;
659 }
660
661 /*
662  * Unlock the inode associated with the inode log item.
663  * Clear the fields of the inode and inode log item that
664  * are specific to the current transaction.  If the
665  * hold flags is set, do not unlock the inode.
666  */
667 STATIC void
668 xfs_inode_item_unlock(
669         xfs_inode_log_item_t    *iip)
670 {
671         uint            hold;
672         uint            iolocked;
673         uint            lock_flags;
674         xfs_inode_t     *ip;
675
676         ASSERT(iip != NULL);
677         ASSERT(iip->ili_inode->i_itemp != NULL);
678         ASSERT(ismrlocked(&(iip->ili_inode->i_lock), MR_UPDATE));
679         ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
680                   XFS_ILI_IOLOCKED_EXCL)) ||
681                ismrlocked(&(iip->ili_inode->i_iolock), MR_UPDATE));
682         ASSERT((!(iip->ili_inode->i_itemp->ili_flags &
683                   XFS_ILI_IOLOCKED_SHARED)) ||
684                ismrlocked(&(iip->ili_inode->i_iolock), MR_ACCESS));
685         /*
686          * Clear the transaction pointer in the inode.
687          */
688         ip = iip->ili_inode;
689         ip->i_transp = NULL;
690
691         /*
692          * If the inode needed a separate buffer with which to log
693          * its extents, then free it now.
694          */
695         if (iip->ili_extents_buf != NULL) {
696                 ASSERT(ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS);
697                 ASSERT(ip->i_d.di_nextents > 0);
698                 ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_DEXT);
699                 ASSERT(ip->i_df.if_bytes > 0);
700                 kmem_free(iip->ili_extents_buf, ip->i_df.if_bytes);
701                 iip->ili_extents_buf = NULL;
702         }
703         if (iip->ili_aextents_buf != NULL) {
704                 ASSERT(ip->i_d.di_aformat == XFS_DINODE_FMT_EXTENTS);
705                 ASSERT(ip->i_d.di_anextents > 0);
706                 ASSERT(iip->ili_format.ilf_fields & XFS_ILOG_AEXT);
707                 ASSERT(ip->i_afp->if_bytes > 0);
708                 kmem_free(iip->ili_aextents_buf, ip->i_afp->if_bytes);
709                 iip->ili_aextents_buf = NULL;
710         }
711
712         /*
713          * Figure out if we should unlock the inode or not.
714          */
715         hold = iip->ili_flags & XFS_ILI_HOLD;
716
717         /*
718          * Before clearing out the flags, remember whether we
719          * are holding the inode's IO lock.
720          */
721         iolocked = iip->ili_flags & XFS_ILI_IOLOCKED_ANY;
722
723         /*
724          * Clear out the fields of the inode log item particular
725          * to the current transaction.
726          */
727         iip->ili_ilock_recur = 0;
728         iip->ili_iolock_recur = 0;
729         iip->ili_flags = 0;
730
731         /*
732          * Unlock the inode if XFS_ILI_HOLD was not set.
733          */
734         if (!hold) {
735                 lock_flags = XFS_ILOCK_EXCL;
736                 if (iolocked & XFS_ILI_IOLOCKED_EXCL) {
737                         lock_flags |= XFS_IOLOCK_EXCL;
738                 } else if (iolocked & XFS_ILI_IOLOCKED_SHARED) {
739                         lock_flags |= XFS_IOLOCK_SHARED;
740                 }
741                 xfs_iput(iip->ili_inode, lock_flags);
742         }
743 }
744
745 /*
746  * This is called to find out where the oldest active copy of the
747  * inode log item in the on disk log resides now that the last log
748  * write of it completed at the given lsn.  Since we always re-log
749  * all dirty data in an inode, the latest copy in the on disk log
750  * is the only one that matters.  Therefore, simply return the
751  * given lsn.
752  */
753 /*ARGSUSED*/
754 STATIC xfs_lsn_t
755 xfs_inode_item_committed(
756         xfs_inode_log_item_t    *iip,
757         xfs_lsn_t               lsn)
758 {
759         return (lsn);
760 }
761
762 /*
763  * The transaction with the inode locked has aborted.  The inode
764  * must not be dirty within the transaction (unless we're forcibly
765  * shutting down).  We simply unlock just as if the transaction
766  * had been cancelled.
767  */
768 STATIC void
769 xfs_inode_item_abort(
770         xfs_inode_log_item_t    *iip)
771 {
772         xfs_inode_item_unlock(iip);
773         return;
774 }
775
776
777 /*
778  * This gets called by xfs_trans_push_ail(), when IOP_TRYLOCK
779  * failed to get the inode flush lock but did get the inode locked SHARED.
780  * Here we're trying to see if the inode buffer is incore, and if so whether it's
781  * marked delayed write. If that's the case, we'll initiate a bawrite on that
782  * buffer to expedite the process.
783  *
784  * We aren't holding the AIL_LOCK (or the flush lock) when this gets called,
785  * so it is inherently race-y.
786  */
787 STATIC void
788 xfs_inode_item_pushbuf(
789         xfs_inode_log_item_t    *iip)
790 {
791         xfs_inode_t     *ip;
792         xfs_mount_t     *mp;
793         xfs_buf_t       *bp;
794         uint            dopush;
795
796         ip = iip->ili_inode;
797
798         ASSERT(ismrlocked(&(ip->i_lock), MR_ACCESS));
799
800         /*
801          * The ili_pushbuf_flag keeps others from
802          * trying to duplicate our effort.
803          */
804         ASSERT(iip->ili_pushbuf_flag != 0);
805         ASSERT(iip->ili_push_owner == get_thread_id());
806
807         /*
808          * If flushlock isn't locked anymore, chances are that the
809          * inode flush completed and the inode was taken off the AIL.
810          * So, just get out.
811          */
812         if ((valusema(&(ip->i_flock)) > 0)  ||
813             ((iip->ili_item.li_flags & XFS_LI_IN_AIL) == 0)) {
814                 iip->ili_pushbuf_flag = 0;
815                 xfs_iunlock(ip, XFS_ILOCK_SHARED);
816                 return;
817         }
818
819         mp = ip->i_mount;
820         bp = xfs_incore(mp->m_ddev_targp, iip->ili_format.ilf_blkno,
821                     iip->ili_format.ilf_len, XFS_INCORE_TRYLOCK);
822
823         if (bp != NULL) {
824                 if (XFS_BUF_ISDELAYWRITE(bp)) {
825                         /*
826                          * We were racing with iflush because we don't hold
827                          * the AIL_LOCK or the flush lock. However, at this point,
828                          * we have the buffer, and we know that it's dirty.
829                          * So, it's possible that iflush raced with us, and
830                          * this item is already taken off the AIL.
831                          * If not, we can flush it async.
832                          */
833                         dopush = ((iip->ili_item.li_flags & XFS_LI_IN_AIL) &&
834                                   (valusema(&(ip->i_flock)) <= 0));
835                         iip->ili_pushbuf_flag = 0;
836                         xfs_iunlock(ip, XFS_ILOCK_SHARED);
837                         xfs_buftrace("INODE ITEM PUSH", bp);
838                         if (XFS_BUF_ISPINNED(bp)) {
839                                 xfs_log_force(mp, (xfs_lsn_t)0,
840                                               XFS_LOG_FORCE);
841                         }
842                         if (dopush) {
843                                 xfs_bawrite(mp, bp);
844                         } else {
845                                 xfs_buf_relse(bp);
846                         }
847                 } else {
848                         iip->ili_pushbuf_flag = 0;
849                         xfs_iunlock(ip, XFS_ILOCK_SHARED);
850                         xfs_buf_relse(bp);
851                 }
852                 return;
853         }
854         /*
855          * We have to be careful about resetting pushbuf flag too early (above).
856          * Even though in theory we can do it as soon as we have the buflock,
857          * we don't want others to be doing work needlessly. They'll come to
858          * this function thinking that pushing the buffer is their
859          * responsibility only to find that the buffer is still locked by
860          * another doing the same thing
861          */
862         iip->ili_pushbuf_flag = 0;
863         xfs_iunlock(ip, XFS_ILOCK_SHARED);
864         return;
865 }
866
867
868 /*
869  * This is called to asynchronously write the inode associated with this
870  * inode log item out to disk. The inode will already have been locked by
871  * a successful call to xfs_inode_item_trylock().
872  */
873 STATIC void
874 xfs_inode_item_push(
875         xfs_inode_log_item_t    *iip)
876 {
877         xfs_inode_t     *ip;
878
879         ip = iip->ili_inode;
880
881         ASSERT(ismrlocked(&(ip->i_lock), MR_ACCESS));
882         ASSERT(valusema(&(ip->i_flock)) <= 0);
883         /*
884          * Since we were able to lock the inode's flush lock and
885          * we found it on the AIL, the inode must be dirty.  This
886          * is because the inode is removed from the AIL while still
887          * holding the flush lock in xfs_iflush_done().  Thus, if
888          * we found it in the AIL and were able to obtain the flush
889          * lock without sleeping, then there must not have been
890          * anyone in the process of flushing the inode.
891          */
892         ASSERT(XFS_FORCED_SHUTDOWN(ip->i_mount) ||
893                iip->ili_format.ilf_fields != 0);
894
895         /*
896          * Write out the inode.  The completion routine ('iflush_done') will
897          * pull it from the AIL, mark it clean, unlock the flush lock.
898          */
899         (void) xfs_iflush(ip, XFS_IFLUSH_ASYNC);
900         xfs_iunlock(ip, XFS_ILOCK_SHARED);
901
902         return;
903 }
904
905 /*
906  * XXX rcc - this one really has to do something.  Probably needs
907  * to stamp in a new field in the incore inode.
908  */
909 /* ARGSUSED */
910 STATIC void
911 xfs_inode_item_committing(
912         xfs_inode_log_item_t    *iip,
913         xfs_lsn_t               lsn)
914 {
915         iip->ili_last_lsn = lsn;
916         return;
917 }
918
919 /*
920  * This is the ops vector shared by all buf log items.
921  */
922 STATIC struct xfs_item_ops xfs_inode_item_ops = {
923         .iop_size       = (uint(*)(xfs_log_item_t*))xfs_inode_item_size,
924         .iop_format     = (void(*)(xfs_log_item_t*, xfs_log_iovec_t*))
925                                         xfs_inode_item_format,
926         .iop_pin        = (void(*)(xfs_log_item_t*))xfs_inode_item_pin,
927         .iop_unpin      = (void(*)(xfs_log_item_t*, int))xfs_inode_item_unpin,
928         .iop_unpin_remove = (void(*)(xfs_log_item_t*, xfs_trans_t*))
929                                         xfs_inode_item_unpin_remove,
930         .iop_trylock    = (uint(*)(xfs_log_item_t*))xfs_inode_item_trylock,
931         .iop_unlock     = (void(*)(xfs_log_item_t*))xfs_inode_item_unlock,
932         .iop_committed  = (xfs_lsn_t(*)(xfs_log_item_t*, xfs_lsn_t))
933                                         xfs_inode_item_committed,
934         .iop_push       = (void(*)(xfs_log_item_t*))xfs_inode_item_push,
935         .iop_abort      = (void(*)(xfs_log_item_t*))xfs_inode_item_abort,
936         .iop_pushbuf    = (void(*)(xfs_log_item_t*))xfs_inode_item_pushbuf,
937         .iop_committing = (void(*)(xfs_log_item_t*, xfs_lsn_t))
938                                         xfs_inode_item_committing
939 };
940
941
942 /*
943  * Initialize the inode log item for a newly allocated (in-core) inode.
944  */
945 void
946 xfs_inode_item_init(
947         xfs_inode_t     *ip,
948         xfs_mount_t     *mp)
949 {
950         xfs_inode_log_item_t    *iip;
951
952         ASSERT(ip->i_itemp == NULL);
953         iip = ip->i_itemp = kmem_zone_zalloc(xfs_ili_zone, KM_SLEEP);
954
955         iip->ili_item.li_type = XFS_LI_INODE;
956         iip->ili_item.li_ops = &xfs_inode_item_ops;
957         iip->ili_item.li_mountp = mp;
958         iip->ili_inode = ip;
959
960         /*
961            We have zeroed memory. No need ...
962            iip->ili_extents_buf = NULL;
963            iip->ili_pushbuf_flag = 0;
964          */
965
966         iip->ili_format.ilf_type = XFS_LI_INODE;
967         iip->ili_format.ilf_ino = ip->i_ino;
968         iip->ili_format.ilf_blkno = ip->i_blkno;
969         iip->ili_format.ilf_len = ip->i_len;
970         iip->ili_format.ilf_boffset = ip->i_boffset;
971 }
972
973 /*
974  * Free the inode log item and any memory hanging off of it.
975  */
976 void
977 xfs_inode_item_destroy(
978         xfs_inode_t     *ip)
979 {
980 #ifdef XFS_TRANS_DEBUG
981         if (ip->i_itemp->ili_root_size != 0) {
982                 kmem_free(ip->i_itemp->ili_orig_root,
983                           ip->i_itemp->ili_root_size);
984         }
985 #endif
986         kmem_zone_free(xfs_ili_zone, ip->i_itemp);
987 }
988
989
990 /*
991  * This is the inode flushing I/O completion routine.  It is called
992  * from interrupt level when the buffer containing the inode is
993  * flushed to disk.  It is responsible for removing the inode item
994  * from the AIL if it has not been re-logged, and unlocking the inode's
995  * flush lock.
996  */
997 /*ARGSUSED*/
998 void
999 xfs_iflush_done(
1000         xfs_buf_t               *bp,
1001         xfs_inode_log_item_t    *iip)
1002 {
1003         xfs_inode_t     *ip;
1004         SPLDECL(s);
1005
1006         ip = iip->ili_inode;
1007
1008         /*
1009          * We only want to pull the item from the AIL if it is
1010          * actually there and its location in the log has not
1011          * changed since we started the flush.  Thus, we only bother
1012          * if the ili_logged flag is set and the inode's lsn has not
1013          * changed.  First we check the lsn outside
1014          * the lock since it's cheaper, and then we recheck while
1015          * holding the lock before removing the inode from the AIL.
1016          */
1017         if (iip->ili_logged &&
1018             (iip->ili_item.li_lsn == iip->ili_flush_lsn)) {
1019                 AIL_LOCK(ip->i_mount, s);
1020                 if (iip->ili_item.li_lsn == iip->ili_flush_lsn) {
1021                         /*
1022                          * xfs_trans_delete_ail() drops the AIL lock.
1023                          */
1024                         xfs_trans_delete_ail(ip->i_mount,
1025                                              (xfs_log_item_t*)iip, s);
1026                 } else {
1027                         AIL_UNLOCK(ip->i_mount, s);
1028                 }
1029         }
1030
1031         iip->ili_logged = 0;
1032
1033         /*
1034          * Clear the ili_last_fields bits now that we know that the
1035          * data corresponding to them is safely on disk.
1036          */
1037         iip->ili_last_fields = 0;
1038
1039         /*
1040          * Release the inode's flush lock since we're done with it.
1041          */
1042         xfs_ifunlock(ip);
1043
1044         return;
1045 }
1046
1047 /*
1048  * This is the inode flushing abort routine.  It is called
1049  * from xfs_iflush when the filesystem is shutting down to clean
1050  * up the inode state.
1051  * It is responsible for removing the inode item
1052  * from the AIL if it has not been re-logged, and unlocking the inode's
1053  * flush lock.
1054  */
1055 void
1056 xfs_iflush_abort(
1057         xfs_inode_t             *ip)
1058 {
1059         xfs_inode_log_item_t    *iip;
1060         xfs_mount_t             *mp;
1061         SPLDECL(s);
1062
1063         iip = ip->i_itemp;
1064         mp = ip->i_mount;
1065         if (iip) {
1066                 if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
1067                         AIL_LOCK(mp, s);
1068                         if (iip->ili_item.li_flags & XFS_LI_IN_AIL) {
1069                                 /*
1070                                  * xfs_trans_delete_ail() drops the AIL lock.
1071                                  */
1072                                 xfs_trans_delete_ail(mp, (xfs_log_item_t *)iip,
1073                                         s);
1074                         } else
1075                                 AIL_UNLOCK(mp, s);
1076                 }
1077                 iip->ili_logged = 0;
1078                 /*
1079                  * Clear the ili_last_fields bits now that we know that the
1080                  * data corresponding to them is safely on disk.
1081                  */
1082                 iip->ili_last_fields = 0;
1083                 /*
1084                  * Clear the inode logging fields so no more flushes are
1085                  * attempted.
1086                  */
1087                 iip->ili_format.ilf_fields = 0;
1088         }
1089         /*
1090          * Release the inode's flush lock since we're done with it.
1091          */
1092         xfs_ifunlock(ip);
1093 }
1094
1095 void
1096 xfs_istale_done(
1097         xfs_buf_t               *bp,
1098         xfs_inode_log_item_t    *iip)
1099 {
1100         xfs_iflush_abort(iip->ili_inode);
1101 }