blob: 5887e41c0323ae85f867cc9bc83bbdf8c1e41cd1 [file] [log] [blame]
Dave Chinner68988112013-08-12 20:49:42 +10001/*
2 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
Dave Chinnerc24b5df2013-08-12 20:49:45 +10003 * Copyright (c) 2012 Red Hat, Inc.
Dave Chinner68988112013-08-12 20:49:42 +10004 * All Rights Reserved.
5 *
6 * This program is free software; you can redistribute it and/or
7 * modify it under the terms of the GNU General Public License as
8 * published by the Free Software Foundation.
9 *
10 * This program is distributed in the hope that it would be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
13 * GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write the Free Software Foundation,
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
18 */
19#include "xfs.h"
20#include "xfs_fs.h"
Dave Chinner70a9883c2013-10-23 10:36:05 +110021#include "xfs_shared.h"
Dave Chinner239880e2013-10-23 10:50:10 +110022#include "xfs_format.h"
23#include "xfs_log_format.h"
24#include "xfs_trans_resv.h"
Dave Chinner68988112013-08-12 20:49:42 +100025#include "xfs_bit.h"
Dave Chinner68988112013-08-12 20:49:42 +100026#include "xfs_sb.h"
27#include "xfs_ag.h"
28#include "xfs_mount.h"
Dave Chinner57062782013-10-15 09:17:51 +110029#include "xfs_da_format.h"
Dave Chinner68988112013-08-12 20:49:42 +100030#include "xfs_inode.h"
31#include "xfs_btree.h"
Dave Chinner239880e2013-10-23 10:50:10 +110032#include "xfs_trans.h"
Dave Chinner68988112013-08-12 20:49:42 +100033#include "xfs_extfree_item.h"
34#include "xfs_alloc.h"
35#include "xfs_bmap.h"
36#include "xfs_bmap_util.h"
Dave Chinnera4fbe6a2013-10-23 10:51:50 +110037#include "xfs_bmap_btree.h"
Dave Chinner68988112013-08-12 20:49:42 +100038#include "xfs_rtalloc.h"
39#include "xfs_error.h"
40#include "xfs_quota.h"
41#include "xfs_trans_space.h"
42#include "xfs_trace.h"
Dave Chinnerc24b5df2013-08-12 20:49:45 +100043#include "xfs_icache.h"
Dave Chinner239880e2013-10-23 10:50:10 +110044#include "xfs_log.h"
Dave Chinnera4fbe6a2013-10-23 10:51:50 +110045#include "xfs_dinode.h"
Dave Chinner68988112013-08-12 20:49:42 +100046
47/* Kernel only BMAP related definitions and functions */
48
49/*
50 * Convert the given file system block to a disk block. We have to treat it
51 * differently based on whether the file is a real time file or not, because the
52 * bmap code does.
53 */
54xfs_daddr_t
55xfs_fsb_to_db(struct xfs_inode *ip, xfs_fsblock_t fsb)
56{
57 return (XFS_IS_REALTIME_INODE(ip) ? \
58 (xfs_daddr_t)XFS_FSB_TO_BB((ip)->i_mount, (fsb)) : \
59 XFS_FSB_TO_DADDR((ip)->i_mount, (fsb)));
60}
61
62/*
63 * Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
64 * caller. Frees all the extents that need freeing, which must be done
65 * last due to locking considerations. We never free any extents in
66 * the first transaction.
67 *
68 * Return 1 if the given transaction was committed and a new one
69 * started, and 0 otherwise in the committed parameter.
70 */
71int /* error */
72xfs_bmap_finish(
73 xfs_trans_t **tp, /* transaction pointer addr */
74 xfs_bmap_free_t *flist, /* i/o: list extents to free */
75 int *committed) /* xact committed or not */
76{
77 xfs_efd_log_item_t *efd; /* extent free data */
78 xfs_efi_log_item_t *efi; /* extent free intention */
79 int error; /* error return value */
80 xfs_bmap_free_item_t *free; /* free extent item */
Jie Liu3d3c8b52013-08-12 20:49:59 +100081 struct xfs_trans_res tres; /* new log reservation */
Dave Chinner68988112013-08-12 20:49:42 +100082 xfs_mount_t *mp; /* filesystem mount structure */
83 xfs_bmap_free_item_t *next; /* next item on free list */
84 xfs_trans_t *ntp; /* new transaction pointer */
85
86 ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
87 if (flist->xbf_count == 0) {
88 *committed = 0;
89 return 0;
90 }
91 ntp = *tp;
92 efi = xfs_trans_get_efi(ntp, flist->xbf_count);
93 for (free = flist->xbf_first; free; free = free->xbfi_next)
94 xfs_trans_log_efi_extent(ntp, efi, free->xbfi_startblock,
95 free->xbfi_blockcount);
Jie Liu3d3c8b52013-08-12 20:49:59 +100096
97 tres.tr_logres = ntp->t_log_res;
98 tres.tr_logcount = ntp->t_log_count;
99 tres.tr_logflags = XFS_TRANS_PERM_LOG_RES;
Dave Chinner68988112013-08-12 20:49:42 +1000100 ntp = xfs_trans_dup(*tp);
101 error = xfs_trans_commit(*tp, 0);
102 *tp = ntp;
103 *committed = 1;
104 /*
105 * We have a new transaction, so we should return committed=1,
106 * even though we're returning an error.
107 */
108 if (error)
109 return error;
110
111 /*
112 * transaction commit worked ok so we can drop the extra ticket
113 * reference that we gained in xfs_trans_dup()
114 */
115 xfs_log_ticket_put(ntp->t_ticket);
116
Jie Liu3d3c8b52013-08-12 20:49:59 +1000117 error = xfs_trans_reserve(ntp, &tres, 0, 0);
118 if (error)
Dave Chinner68988112013-08-12 20:49:42 +1000119 return error;
120 efd = xfs_trans_get_efd(ntp, efi, flist->xbf_count);
121 for (free = flist->xbf_first; free != NULL; free = next) {
122 next = free->xbfi_next;
123 if ((error = xfs_free_extent(ntp, free->xbfi_startblock,
124 free->xbfi_blockcount))) {
125 /*
126 * The bmap free list will be cleaned up at a
127 * higher level. The EFI will be canceled when
128 * this transaction is aborted.
129 * Need to force shutdown here to make sure it
130 * happens, since this transaction may not be
131 * dirty yet.
132 */
133 mp = ntp->t_mountp;
134 if (!XFS_FORCED_SHUTDOWN(mp))
135 xfs_force_shutdown(mp,
136 (error == EFSCORRUPTED) ?
137 SHUTDOWN_CORRUPT_INCORE :
138 SHUTDOWN_META_IO_ERROR);
139 return error;
140 }
141 xfs_trans_log_efd_extent(ntp, efd, free->xbfi_startblock,
142 free->xbfi_blockcount);
143 xfs_bmap_del_free(flist, NULL, free);
144 }
145 return 0;
146}
147
148int
149xfs_bmap_rtalloc(
150 struct xfs_bmalloca *ap) /* bmap alloc argument struct */
151{
152 xfs_alloctype_t atype = 0; /* type for allocation routines */
153 int error; /* error return value */
154 xfs_mount_t *mp; /* mount point structure */
155 xfs_extlen_t prod = 0; /* product factor for allocators */
156 xfs_extlen_t ralen = 0; /* realtime allocation length */
157 xfs_extlen_t align; /* minimum allocation alignment */
158 xfs_rtblock_t rtb;
159
160 mp = ap->ip->i_mount;
161 align = xfs_get_extsz_hint(ap->ip);
162 prod = align / mp->m_sb.sb_rextsize;
163 error = xfs_bmap_extsize_align(mp, &ap->got, &ap->prev,
164 align, 1, ap->eof, 0,
165 ap->conv, &ap->offset, &ap->length);
166 if (error)
167 return error;
168 ASSERT(ap->length);
169 ASSERT(ap->length % mp->m_sb.sb_rextsize == 0);
170
171 /*
172 * If the offset & length are not perfectly aligned
173 * then kill prod, it will just get us in trouble.
174 */
175 if (do_mod(ap->offset, align) || ap->length % align)
176 prod = 1;
177 /*
178 * Set ralen to be the actual requested length in rtextents.
179 */
180 ralen = ap->length / mp->m_sb.sb_rextsize;
181 /*
182 * If the old value was close enough to MAXEXTLEN that
183 * we rounded up to it, cut it back so it's valid again.
184 * Note that if it's a really large request (bigger than
185 * MAXEXTLEN), we don't hear about that number, and can't
186 * adjust the starting point to match it.
187 */
188 if (ralen * mp->m_sb.sb_rextsize >= MAXEXTLEN)
189 ralen = MAXEXTLEN / mp->m_sb.sb_rextsize;
190
191 /*
192 * Lock out other modifications to the RT bitmap inode.
193 */
194 xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
195 xfs_trans_ijoin(ap->tp, mp->m_rbmip, XFS_ILOCK_EXCL);
196
197 /*
198 * If it's an allocation to an empty file at offset 0,
199 * pick an extent that will space things out in the rt area.
200 */
201 if (ap->eof && ap->offset == 0) {
202 xfs_rtblock_t uninitialized_var(rtx); /* realtime extent no */
203
204 error = xfs_rtpick_extent(mp, ap->tp, ralen, &rtx);
205 if (error)
206 return error;
207 ap->blkno = rtx * mp->m_sb.sb_rextsize;
208 } else {
209 ap->blkno = 0;
210 }
211
212 xfs_bmap_adjacent(ap);
213
214 /*
215 * Realtime allocation, done through xfs_rtallocate_extent.
216 */
217 atype = ap->blkno == 0 ? XFS_ALLOCTYPE_ANY_AG : XFS_ALLOCTYPE_NEAR_BNO;
218 do_div(ap->blkno, mp->m_sb.sb_rextsize);
219 rtb = ap->blkno;
220 ap->length = ralen;
221 if ((error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1, ap->length,
222 &ralen, atype, ap->wasdel, prod, &rtb)))
223 return error;
224 if (rtb == NULLFSBLOCK && prod > 1 &&
225 (error = xfs_rtallocate_extent(ap->tp, ap->blkno, 1,
226 ap->length, &ralen, atype,
227 ap->wasdel, 1, &rtb)))
228 return error;
229 ap->blkno = rtb;
230 if (ap->blkno != NULLFSBLOCK) {
231 ap->blkno *= mp->m_sb.sb_rextsize;
232 ralen *= mp->m_sb.sb_rextsize;
233 ap->length = ralen;
234 ap->ip->i_d.di_nblocks += ralen;
235 xfs_trans_log_inode(ap->tp, ap->ip, XFS_ILOG_CORE);
236 if (ap->wasdel)
237 ap->ip->i_delayed_blks -= ralen;
238 /*
239 * Adjust the disk quota also. This was reserved
240 * earlier.
241 */
242 xfs_trans_mod_dquot_byino(ap->tp, ap->ip,
243 ap->wasdel ? XFS_TRANS_DQ_DELRTBCOUNT :
244 XFS_TRANS_DQ_RTBCOUNT, (long) ralen);
245 } else {
246 ap->length = 0;
247 }
248 return 0;
249}
250
251/*
252 * Stack switching interfaces for allocation
253 */
254static void
255xfs_bmapi_allocate_worker(
256 struct work_struct *work)
257{
258 struct xfs_bmalloca *args = container_of(work,
259 struct xfs_bmalloca, work);
260 unsigned long pflags;
261
262 /* we are in a transaction context here */
263 current_set_flags_nested(&pflags, PF_FSTRANS);
264
265 args->result = __xfs_bmapi_allocate(args);
266 complete(args->done);
267
268 current_restore_flags_nested(&pflags, PF_FSTRANS);
269}
270
271/*
272 * Some allocation requests often come in with little stack to work on. Push
273 * them off to a worker thread so there is lots of stack to use. Otherwise just
274 * call directly to avoid the context switch overhead here.
275 */
276int
277xfs_bmapi_allocate(
278 struct xfs_bmalloca *args)
279{
280 DECLARE_COMPLETION_ONSTACK(done);
281
282 if (!args->stack_switch)
283 return __xfs_bmapi_allocate(args);
284
285
286 args->done = &done;
287 INIT_WORK_ONSTACK(&args->work, xfs_bmapi_allocate_worker);
288 queue_work(xfs_alloc_wq, &args->work);
289 wait_for_completion(&done);
290 return args->result;
291}
292
293/*
294 * Check if the endoff is outside the last extent. If so the caller will grow
295 * the allocation to a stripe unit boundary. All offsets are considered outside
296 * the end of file for an empty fork, so 1 is returned in *eof in that case.
297 */
298int
299xfs_bmap_eof(
300 struct xfs_inode *ip,
301 xfs_fileoff_t endoff,
302 int whichfork,
303 int *eof)
304{
305 struct xfs_bmbt_irec rec;
306 int error;
307
308 error = xfs_bmap_last_extent(NULL, ip, whichfork, &rec, eof);
309 if (error || *eof)
310 return error;
311
312 *eof = endoff >= rec.br_startoff + rec.br_blockcount;
313 return 0;
314}
315
316/*
317 * Extent tree block counting routines.
318 */
319
320/*
321 * Count leaf blocks given a range of extent records.
322 */
323STATIC void
324xfs_bmap_count_leaves(
325 xfs_ifork_t *ifp,
326 xfs_extnum_t idx,
327 int numrecs,
328 int *count)
329{
330 int b;
331
332 for (b = 0; b < numrecs; b++) {
333 xfs_bmbt_rec_host_t *frp = xfs_iext_get_ext(ifp, idx + b);
334 *count += xfs_bmbt_get_blockcount(frp);
335 }
336}
337
338/*
339 * Count leaf blocks given a range of extent records originally
340 * in btree format.
341 */
342STATIC void
343xfs_bmap_disk_count_leaves(
344 struct xfs_mount *mp,
345 struct xfs_btree_block *block,
346 int numrecs,
347 int *count)
348{
349 int b;
350 xfs_bmbt_rec_t *frp;
351
352 for (b = 1; b <= numrecs; b++) {
353 frp = XFS_BMBT_REC_ADDR(mp, block, b);
354 *count += xfs_bmbt_disk_get_blockcount(frp);
355 }
356}
357
358/*
359 * Recursively walks each level of a btree
Zhi Yong Wu8be11e92013-08-12 03:14:52 +0000360 * to count total fsblocks in use.
Dave Chinner68988112013-08-12 20:49:42 +1000361 */
362STATIC int /* error */
363xfs_bmap_count_tree(
364 xfs_mount_t *mp, /* file system mount point */
365 xfs_trans_t *tp, /* transaction pointer */
366 xfs_ifork_t *ifp, /* inode fork pointer */
367 xfs_fsblock_t blockno, /* file system block number */
368 int levelin, /* level in btree */
369 int *count) /* Count of blocks */
370{
371 int error;
372 xfs_buf_t *bp, *nbp;
373 int level = levelin;
374 __be64 *pp;
375 xfs_fsblock_t bno = blockno;
376 xfs_fsblock_t nextbno;
377 struct xfs_btree_block *block, *nextblock;
378 int numrecs;
379
380 error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp, XFS_BMAP_BTREE_REF,
381 &xfs_bmbt_buf_ops);
382 if (error)
383 return error;
384 *count += 1;
385 block = XFS_BUF_TO_BLOCK(bp);
386
387 if (--level) {
388 /* Not at node above leaves, count this level of nodes */
389 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
390 while (nextbno != NULLFSBLOCK) {
391 error = xfs_btree_read_bufl(mp, tp, nextbno, 0, &nbp,
392 XFS_BMAP_BTREE_REF,
393 &xfs_bmbt_buf_ops);
394 if (error)
395 return error;
396 *count += 1;
397 nextblock = XFS_BUF_TO_BLOCK(nbp);
398 nextbno = be64_to_cpu(nextblock->bb_u.l.bb_rightsib);
399 xfs_trans_brelse(tp, nbp);
400 }
401
402 /* Dive to the next level */
403 pp = XFS_BMBT_PTR_ADDR(mp, block, 1, mp->m_bmap_dmxr[1]);
404 bno = be64_to_cpu(*pp);
405 if (unlikely((error =
406 xfs_bmap_count_tree(mp, tp, ifp, bno, level, count)) < 0)) {
407 xfs_trans_brelse(tp, bp);
408 XFS_ERROR_REPORT("xfs_bmap_count_tree(1)",
409 XFS_ERRLEVEL_LOW, mp);
410 return XFS_ERROR(EFSCORRUPTED);
411 }
412 xfs_trans_brelse(tp, bp);
413 } else {
414 /* count all level 1 nodes and their leaves */
415 for (;;) {
416 nextbno = be64_to_cpu(block->bb_u.l.bb_rightsib);
417 numrecs = be16_to_cpu(block->bb_numrecs);
418 xfs_bmap_disk_count_leaves(mp, block, numrecs, count);
419 xfs_trans_brelse(tp, bp);
420 if (nextbno == NULLFSBLOCK)
421 break;
422 bno = nextbno;
423 error = xfs_btree_read_bufl(mp, tp, bno, 0, &bp,
424 XFS_BMAP_BTREE_REF,
425 &xfs_bmbt_buf_ops);
426 if (error)
427 return error;
428 *count += 1;
429 block = XFS_BUF_TO_BLOCK(bp);
430 }
431 }
432 return 0;
433}
434
435/*
436 * Count fsblocks of the given fork.
437 */
438int /* error */
439xfs_bmap_count_blocks(
440 xfs_trans_t *tp, /* transaction pointer */
441 xfs_inode_t *ip, /* incore inode */
442 int whichfork, /* data or attr fork */
443 int *count) /* out: count of blocks */
444{
445 struct xfs_btree_block *block; /* current btree block */
446 xfs_fsblock_t bno; /* block # of "block" */
447 xfs_ifork_t *ifp; /* fork structure */
448 int level; /* btree level, for checking */
449 xfs_mount_t *mp; /* file system mount structure */
450 __be64 *pp; /* pointer to block address */
451
452 bno = NULLFSBLOCK;
453 mp = ip->i_mount;
454 ifp = XFS_IFORK_PTR(ip, whichfork);
455 if ( XFS_IFORK_FORMAT(ip, whichfork) == XFS_DINODE_FMT_EXTENTS ) {
456 xfs_bmap_count_leaves(ifp, 0,
457 ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t),
458 count);
459 return 0;
460 }
461
462 /*
463 * Root level must use BMAP_BROOT_PTR_ADDR macro to get ptr out.
464 */
465 block = ifp->if_broot;
466 level = be16_to_cpu(block->bb_level);
467 ASSERT(level > 0);
468 pp = XFS_BMAP_BROOT_PTR_ADDR(mp, block, 1, ifp->if_broot_bytes);
469 bno = be64_to_cpu(*pp);
470 ASSERT(bno != NULLDFSBNO);
471 ASSERT(XFS_FSB_TO_AGNO(mp, bno) < mp->m_sb.sb_agcount);
472 ASSERT(XFS_FSB_TO_AGBNO(mp, bno) < mp->m_sb.sb_agblocks);
473
474 if (unlikely(xfs_bmap_count_tree(mp, tp, ifp, bno, level, count) < 0)) {
475 XFS_ERROR_REPORT("xfs_bmap_count_blocks(2)", XFS_ERRLEVEL_LOW,
476 mp);
477 return XFS_ERROR(EFSCORRUPTED);
478 }
479
480 return 0;
481}
482
483/*
484 * returns 1 for success, 0 if we failed to map the extent.
485 */
486STATIC int
487xfs_getbmapx_fix_eof_hole(
488 xfs_inode_t *ip, /* xfs incore inode pointer */
489 struct getbmapx *out, /* output structure */
490 int prealloced, /* this is a file with
491 * preallocated data space */
492 __int64_t end, /* last block requested */
493 xfs_fsblock_t startblock)
494{
495 __int64_t fixlen;
496 xfs_mount_t *mp; /* file system mount point */
497 xfs_ifork_t *ifp; /* inode fork pointer */
498 xfs_extnum_t lastx; /* last extent pointer */
499 xfs_fileoff_t fileblock;
500
501 if (startblock == HOLESTARTBLOCK) {
502 mp = ip->i_mount;
503 out->bmv_block = -1;
504 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, XFS_ISIZE(ip)));
505 fixlen -= out->bmv_offset;
506 if (prealloced && out->bmv_offset + out->bmv_length == end) {
507 /* Came to hole at EOF. Trim it. */
508 if (fixlen <= 0)
509 return 0;
510 out->bmv_length = fixlen;
511 }
512 } else {
513 if (startblock == DELAYSTARTBLOCK)
514 out->bmv_block = -2;
515 else
516 out->bmv_block = xfs_fsb_to_db(ip, startblock);
517 fileblock = XFS_BB_TO_FSB(ip->i_mount, out->bmv_offset);
518 ifp = XFS_IFORK_PTR(ip, XFS_DATA_FORK);
519 if (xfs_iext_bno_to_ext(ifp, fileblock, &lastx) &&
520 (lastx == (ifp->if_bytes / (uint)sizeof(xfs_bmbt_rec_t))-1))
521 out->bmv_oflags |= BMV_OF_LAST;
522 }
523
524 return 1;
525}
526
527/*
528 * Get inode's extents as described in bmv, and format for output.
529 * Calls formatter to fill the user's buffer until all extents
530 * are mapped, until the passed-in bmv->bmv_count slots have
531 * been filled, or until the formatter short-circuits the loop,
532 * if it is tracking filled-in extents on its own.
533 */
534int /* error code */
535xfs_getbmap(
536 xfs_inode_t *ip,
537 struct getbmapx *bmv, /* user bmap structure */
538 xfs_bmap_format_t formatter, /* format to user */
539 void *arg) /* formatter arg */
540{
541 __int64_t bmvend; /* last block requested */
542 int error = 0; /* return value */
543 __int64_t fixlen; /* length for -1 case */
544 int i; /* extent number */
545 int lock; /* lock state */
546 xfs_bmbt_irec_t *map; /* buffer for user's data */
547 xfs_mount_t *mp; /* file system mount point */
548 int nex; /* # of user extents can do */
549 int nexleft; /* # of user extents left */
550 int subnex; /* # of bmapi's can do */
551 int nmap; /* number of map entries */
552 struct getbmapx *out; /* output structure */
553 int whichfork; /* data or attr fork */
554 int prealloced; /* this is a file with
555 * preallocated data space */
556 int iflags; /* interface flags */
557 int bmapi_flags; /* flags for xfs_bmapi */
558 int cur_ext = 0;
559
560 mp = ip->i_mount;
561 iflags = bmv->bmv_iflags;
562 whichfork = iflags & BMV_IF_ATTRFORK ? XFS_ATTR_FORK : XFS_DATA_FORK;
563
564 if (whichfork == XFS_ATTR_FORK) {
565 if (XFS_IFORK_Q(ip)) {
566 if (ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS &&
567 ip->i_d.di_aformat != XFS_DINODE_FMT_BTREE &&
568 ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)
569 return XFS_ERROR(EINVAL);
570 } else if (unlikely(
571 ip->i_d.di_aformat != 0 &&
572 ip->i_d.di_aformat != XFS_DINODE_FMT_EXTENTS)) {
573 XFS_ERROR_REPORT("xfs_getbmap", XFS_ERRLEVEL_LOW,
574 ip->i_mount);
575 return XFS_ERROR(EFSCORRUPTED);
576 }
577
578 prealloced = 0;
579 fixlen = 1LL << 32;
580 } else {
581 if (ip->i_d.di_format != XFS_DINODE_FMT_EXTENTS &&
582 ip->i_d.di_format != XFS_DINODE_FMT_BTREE &&
583 ip->i_d.di_format != XFS_DINODE_FMT_LOCAL)
584 return XFS_ERROR(EINVAL);
585
586 if (xfs_get_extsz_hint(ip) ||
587 ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC|XFS_DIFLAG_APPEND)){
588 prealloced = 1;
589 fixlen = mp->m_super->s_maxbytes;
590 } else {
591 prealloced = 0;
592 fixlen = XFS_ISIZE(ip);
593 }
594 }
595
596 if (bmv->bmv_length == -1) {
597 fixlen = XFS_FSB_TO_BB(mp, XFS_B_TO_FSB(mp, fixlen));
598 bmv->bmv_length =
599 max_t(__int64_t, fixlen - bmv->bmv_offset, 0);
600 } else if (bmv->bmv_length == 0) {
601 bmv->bmv_entries = 0;
602 return 0;
603 } else if (bmv->bmv_length < 0) {
604 return XFS_ERROR(EINVAL);
605 }
606
607 nex = bmv->bmv_count - 1;
608 if (nex <= 0)
609 return XFS_ERROR(EINVAL);
610 bmvend = bmv->bmv_offset + bmv->bmv_length;
611
612
613 if (bmv->bmv_count > ULONG_MAX / sizeof(struct getbmapx))
614 return XFS_ERROR(ENOMEM);
Dave Chinnerfdd3cce2013-09-02 20:53:00 +1000615 out = kmem_zalloc_large(bmv->bmv_count * sizeof(struct getbmapx), 0);
616 if (!out)
617 return XFS_ERROR(ENOMEM);
Dave Chinner68988112013-08-12 20:49:42 +1000618
619 xfs_ilock(ip, XFS_IOLOCK_SHARED);
620 if (whichfork == XFS_DATA_FORK && !(iflags & BMV_IF_DELALLOC)) {
621 if (ip->i_delayed_blks || XFS_ISIZE(ip) > ip->i_d.di_size) {
622 error = -filemap_write_and_wait(VFS_I(ip)->i_mapping);
623 if (error)
624 goto out_unlock_iolock;
625 }
626 /*
627 * even after flushing the inode, there can still be delalloc
628 * blocks on the inode beyond EOF due to speculative
629 * preallocation. These are not removed until the release
630 * function is called or the inode is inactivated. Hence we
631 * cannot assert here that ip->i_delayed_blks == 0.
632 */
633 }
634
635 lock = xfs_ilock_map_shared(ip);
636
637 /*
638 * Don't let nex be bigger than the number of extents
639 * we can have assuming alternating holes and real extents.
640 */
641 if (nex > XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1)
642 nex = XFS_IFORK_NEXTENTS(ip, whichfork) * 2 + 1;
643
644 bmapi_flags = xfs_bmapi_aflag(whichfork);
645 if (!(iflags & BMV_IF_PREALLOC))
646 bmapi_flags |= XFS_BMAPI_IGSTATE;
647
648 /*
649 * Allocate enough space to handle "subnex" maps at a time.
650 */
651 error = ENOMEM;
652 subnex = 16;
653 map = kmem_alloc(subnex * sizeof(*map), KM_MAYFAIL | KM_NOFS);
654 if (!map)
655 goto out_unlock_ilock;
656
657 bmv->bmv_entries = 0;
658
659 if (XFS_IFORK_NEXTENTS(ip, whichfork) == 0 &&
660 (whichfork == XFS_ATTR_FORK || !(iflags & BMV_IF_DELALLOC))) {
661 error = 0;
662 goto out_free_map;
663 }
664
665 nexleft = nex;
666
667 do {
668 nmap = (nexleft > subnex) ? subnex : nexleft;
669 error = xfs_bmapi_read(ip, XFS_BB_TO_FSBT(mp, bmv->bmv_offset),
670 XFS_BB_TO_FSB(mp, bmv->bmv_length),
671 map, &nmap, bmapi_flags);
672 if (error)
673 goto out_free_map;
674 ASSERT(nmap <= subnex);
675
676 for (i = 0; i < nmap && nexleft && bmv->bmv_length; i++) {
677 out[cur_ext].bmv_oflags = 0;
678 if (map[i].br_state == XFS_EXT_UNWRITTEN)
679 out[cur_ext].bmv_oflags |= BMV_OF_PREALLOC;
680 else if (map[i].br_startblock == DELAYSTARTBLOCK)
681 out[cur_ext].bmv_oflags |= BMV_OF_DELALLOC;
682 out[cur_ext].bmv_offset =
683 XFS_FSB_TO_BB(mp, map[i].br_startoff);
684 out[cur_ext].bmv_length =
685 XFS_FSB_TO_BB(mp, map[i].br_blockcount);
686 out[cur_ext].bmv_unused1 = 0;
687 out[cur_ext].bmv_unused2 = 0;
688
689 /*
690 * delayed allocation extents that start beyond EOF can
691 * occur due to speculative EOF allocation when the
692 * delalloc extent is larger than the largest freespace
693 * extent at conversion time. These extents cannot be
694 * converted by data writeback, so can exist here even
695 * if we are not supposed to be finding delalloc
696 * extents.
697 */
698 if (map[i].br_startblock == DELAYSTARTBLOCK &&
699 map[i].br_startoff <= XFS_B_TO_FSB(mp, XFS_ISIZE(ip)))
700 ASSERT((iflags & BMV_IF_DELALLOC) != 0);
701
702 if (map[i].br_startblock == HOLESTARTBLOCK &&
703 whichfork == XFS_ATTR_FORK) {
704 /* came to the end of attribute fork */
705 out[cur_ext].bmv_oflags |= BMV_OF_LAST;
706 goto out_free_map;
707 }
708
709 if (!xfs_getbmapx_fix_eof_hole(ip, &out[cur_ext],
710 prealloced, bmvend,
711 map[i].br_startblock))
712 goto out_free_map;
713
714 bmv->bmv_offset =
715 out[cur_ext].bmv_offset +
716 out[cur_ext].bmv_length;
717 bmv->bmv_length =
718 max_t(__int64_t, 0, bmvend - bmv->bmv_offset);
719
720 /*
721 * In case we don't want to return the hole,
722 * don't increase cur_ext so that we can reuse
723 * it in the next loop.
724 */
725 if ((iflags & BMV_IF_NO_HOLES) &&
726 map[i].br_startblock == HOLESTARTBLOCK) {
727 memset(&out[cur_ext], 0, sizeof(out[cur_ext]));
728 continue;
729 }
730
731 nexleft--;
732 bmv->bmv_entries++;
733 cur_ext++;
734 }
735 } while (nmap && nexleft && bmv->bmv_length);
736
737 out_free_map:
738 kmem_free(map);
739 out_unlock_ilock:
740 xfs_iunlock_map_shared(ip, lock);
741 out_unlock_iolock:
742 xfs_iunlock(ip, XFS_IOLOCK_SHARED);
743
744 for (i = 0; i < cur_ext; i++) {
745 int full = 0; /* user array is full */
746
747 /* format results & advance arg */
748 error = formatter(&arg, &out[i], &full);
749 if (error || full)
750 break;
751 }
752
Dave Chinnerfdd3cce2013-09-02 20:53:00 +1000753 kmem_free(out);
Dave Chinner68988112013-08-12 20:49:42 +1000754 return error;
755}
756
757/*
758 * dead simple method of punching delalyed allocation blocks from a range in
759 * the inode. Walks a block at a time so will be slow, but is only executed in
Zhi Yong Wuad4809b2013-08-12 03:14:55 +0000760 * rare error cases so the overhead is not critical. This will always punch out
Dave Chinner68988112013-08-12 20:49:42 +1000761 * both the start and end blocks, even if the ranges only partially overlap
762 * them, so it is up to the caller to ensure that partial blocks are not
763 * passed in.
764 */
765int
766xfs_bmap_punch_delalloc_range(
767 struct xfs_inode *ip,
768 xfs_fileoff_t start_fsb,
769 xfs_fileoff_t length)
770{
771 xfs_fileoff_t remaining = length;
772 int error = 0;
773
774 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
775
776 do {
777 int done;
778 xfs_bmbt_irec_t imap;
779 int nimaps = 1;
780 xfs_fsblock_t firstblock;
781 xfs_bmap_free_t flist;
782
783 /*
784 * Map the range first and check that it is a delalloc extent
785 * before trying to unmap the range. Otherwise we will be
786 * trying to remove a real extent (which requires a
787 * transaction) or a hole, which is probably a bad idea...
788 */
789 error = xfs_bmapi_read(ip, start_fsb, 1, &imap, &nimaps,
790 XFS_BMAPI_ENTIRE);
791
792 if (error) {
793 /* something screwed, just bail */
794 if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
795 xfs_alert(ip->i_mount,
796 "Failed delalloc mapping lookup ino %lld fsb %lld.",
797 ip->i_ino, start_fsb);
798 }
799 break;
800 }
801 if (!nimaps) {
802 /* nothing there */
803 goto next_block;
804 }
805 if (imap.br_startblock != DELAYSTARTBLOCK) {
806 /* been converted, ignore */
807 goto next_block;
808 }
809 WARN_ON(imap.br_blockcount == 0);
810
811 /*
812 * Note: while we initialise the firstblock/flist pair, they
813 * should never be used because blocks should never be
814 * allocated or freed for a delalloc extent and hence we need
815 * don't cancel or finish them after the xfs_bunmapi() call.
816 */
817 xfs_bmap_init(&flist, &firstblock);
818 error = xfs_bunmapi(NULL, ip, start_fsb, 1, 0, 1, &firstblock,
819 &flist, &done);
820 if (error)
821 break;
822
823 ASSERT(!flist.xbf_count && !flist.xbf_first);
824next_block:
825 start_fsb++;
826 remaining--;
827 } while(remaining > 0);
828
829 return error;
830}
Dave Chinnerc24b5df2013-08-12 20:49:45 +1000831
832/*
833 * Test whether it is appropriate to check an inode for and free post EOF
834 * blocks. The 'force' parameter determines whether we should also consider
835 * regular files that are marked preallocated or append-only.
836 */
837bool
838xfs_can_free_eofblocks(struct xfs_inode *ip, bool force)
839{
840 /* prealloc/delalloc exists only on regular files */
841 if (!S_ISREG(ip->i_d.di_mode))
842 return false;
843
844 /*
845 * Zero sized files with no cached pages and delalloc blocks will not
846 * have speculative prealloc/delalloc blocks to remove.
847 */
848 if (VFS_I(ip)->i_size == 0 &&
849 VN_CACHED(VFS_I(ip)) == 0 &&
850 ip->i_delayed_blks == 0)
851 return false;
852
853 /* If we haven't read in the extent list, then don't do it now. */
854 if (!(ip->i_df.if_flags & XFS_IFEXTENTS))
855 return false;
856
857 /*
858 * Do not free real preallocated or append-only files unless the file
859 * has delalloc blocks and we are forced to remove them.
860 */
861 if (ip->i_d.di_flags & (XFS_DIFLAG_PREALLOC | XFS_DIFLAG_APPEND))
862 if (!force || ip->i_delayed_blks == 0)
863 return false;
864
865 return true;
866}
867
868/*
869 * This is called by xfs_inactive to free any blocks beyond eof
870 * when the link count isn't zero and by xfs_dm_punch_hole() when
871 * punching a hole to EOF.
872 */
873int
874xfs_free_eofblocks(
875 xfs_mount_t *mp,
876 xfs_inode_t *ip,
877 bool need_iolock)
878{
879 xfs_trans_t *tp;
880 int error;
881 xfs_fileoff_t end_fsb;
882 xfs_fileoff_t last_fsb;
883 xfs_filblks_t map_len;
884 int nimaps;
885 xfs_bmbt_irec_t imap;
886
887 /*
888 * Figure out if there are any blocks beyond the end
889 * of the file. If not, then there is nothing to do.
890 */
891 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip));
892 last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
893 if (last_fsb <= end_fsb)
894 return 0;
895 map_len = last_fsb - end_fsb;
896
897 nimaps = 1;
898 xfs_ilock(ip, XFS_ILOCK_SHARED);
899 error = xfs_bmapi_read(ip, end_fsb, map_len, &imap, &nimaps, 0);
900 xfs_iunlock(ip, XFS_ILOCK_SHARED);
901
902 if (!error && (nimaps != 0) &&
903 (imap.br_startblock != HOLESTARTBLOCK ||
904 ip->i_delayed_blks)) {
905 /*
906 * Attach the dquots to the inode up front.
907 */
908 error = xfs_qm_dqattach(ip, 0);
909 if (error)
910 return error;
911
912 /*
913 * There are blocks after the end of file.
914 * Free them up now by truncating the file to
915 * its current size.
916 */
917 tp = xfs_trans_alloc(mp, XFS_TRANS_INACTIVE);
918
919 if (need_iolock) {
920 if (!xfs_ilock_nowait(ip, XFS_IOLOCK_EXCL)) {
921 xfs_trans_cancel(tp, 0);
922 return EAGAIN;
923 }
924 }
925
Jie Liu3d3c8b52013-08-12 20:49:59 +1000926 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_itruncate, 0, 0);
Dave Chinnerc24b5df2013-08-12 20:49:45 +1000927 if (error) {
928 ASSERT(XFS_FORCED_SHUTDOWN(mp));
929 xfs_trans_cancel(tp, 0);
930 if (need_iolock)
931 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
932 return error;
933 }
934
935 xfs_ilock(ip, XFS_ILOCK_EXCL);
936 xfs_trans_ijoin(tp, ip, 0);
937
938 /*
939 * Do not update the on-disk file size. If we update the
940 * on-disk file size and then the system crashes before the
941 * contents of the file are flushed to disk then the files
942 * may be full of holes (ie NULL files bug).
943 */
944 error = xfs_itruncate_extents(&tp, ip, XFS_DATA_FORK,
945 XFS_ISIZE(ip));
946 if (error) {
947 /*
948 * If we get an error at this point we simply don't
949 * bother truncating the file.
950 */
951 xfs_trans_cancel(tp,
952 (XFS_TRANS_RELEASE_LOG_RES |
953 XFS_TRANS_ABORT));
954 } else {
955 error = xfs_trans_commit(tp,
956 XFS_TRANS_RELEASE_LOG_RES);
957 if (!error)
958 xfs_inode_clear_eofblocks_tag(ip);
959 }
960
961 xfs_iunlock(ip, XFS_ILOCK_EXCL);
962 if (need_iolock)
963 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
964 }
965 return error;
966}
967
Christoph Hellwig83aee9e2013-10-12 00:55:07 -0700968int
Dave Chinnerc24b5df2013-08-12 20:49:45 +1000969xfs_alloc_file_space(
Christoph Hellwig83aee9e2013-10-12 00:55:07 -0700970 struct xfs_inode *ip,
Dave Chinnerc24b5df2013-08-12 20:49:45 +1000971 xfs_off_t offset,
972 xfs_off_t len,
Christoph Hellwig5f8aca82013-10-12 00:55:06 -0700973 int alloc_type)
Dave Chinnerc24b5df2013-08-12 20:49:45 +1000974{
975 xfs_mount_t *mp = ip->i_mount;
976 xfs_off_t count;
977 xfs_filblks_t allocated_fsb;
978 xfs_filblks_t allocatesize_fsb;
979 xfs_extlen_t extsz, temp;
980 xfs_fileoff_t startoffset_fsb;
981 xfs_fsblock_t firstfsb;
982 int nimaps;
983 int quota_flag;
984 int rt;
985 xfs_trans_t *tp;
986 xfs_bmbt_irec_t imaps[1], *imapp;
987 xfs_bmap_free_t free_list;
988 uint qblocks, resblks, resrtextents;
989 int committed;
990 int error;
991
992 trace_xfs_alloc_file_space(ip);
993
994 if (XFS_FORCED_SHUTDOWN(mp))
995 return XFS_ERROR(EIO);
996
997 error = xfs_qm_dqattach(ip, 0);
998 if (error)
999 return error;
1000
1001 if (len <= 0)
1002 return XFS_ERROR(EINVAL);
1003
1004 rt = XFS_IS_REALTIME_INODE(ip);
1005 extsz = xfs_get_extsz_hint(ip);
1006
1007 count = len;
1008 imapp = &imaps[0];
1009 nimaps = 1;
1010 startoffset_fsb = XFS_B_TO_FSBT(mp, offset);
1011 allocatesize_fsb = XFS_B_TO_FSB(mp, count);
1012
1013 /*
1014 * Allocate file space until done or until there is an error
1015 */
1016 while (allocatesize_fsb && !error) {
1017 xfs_fileoff_t s, e;
1018
1019 /*
1020 * Determine space reservations for data/realtime.
1021 */
1022 if (unlikely(extsz)) {
1023 s = startoffset_fsb;
1024 do_div(s, extsz);
1025 s *= extsz;
1026 e = startoffset_fsb + allocatesize_fsb;
1027 if ((temp = do_mod(startoffset_fsb, extsz)))
1028 e += temp;
1029 if ((temp = do_mod(e, extsz)))
1030 e += extsz - temp;
1031 } else {
1032 s = 0;
1033 e = allocatesize_fsb;
1034 }
1035
1036 /*
1037 * The transaction reservation is limited to a 32-bit block
1038 * count, hence we need to limit the number of blocks we are
1039 * trying to reserve to avoid an overflow. We can't allocate
1040 * more than @nimaps extents, and an extent is limited on disk
1041 * to MAXEXTLEN (21 bits), so use that to enforce the limit.
1042 */
1043 resblks = min_t(xfs_fileoff_t, (e - s), (MAXEXTLEN * nimaps));
1044 if (unlikely(rt)) {
1045 resrtextents = qblocks = resblks;
1046 resrtextents /= mp->m_sb.sb_rextsize;
1047 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
1048 quota_flag = XFS_QMOPT_RES_RTBLKS;
1049 } else {
1050 resrtextents = 0;
1051 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resblks);
1052 quota_flag = XFS_QMOPT_RES_REGBLKS;
1053 }
1054
1055 /*
1056 * Allocate and setup the transaction.
1057 */
1058 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
Jie Liu3d3c8b52013-08-12 20:49:59 +10001059 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write,
1060 resblks, resrtextents);
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001061 /*
1062 * Check for running out of space
1063 */
1064 if (error) {
1065 /*
1066 * Free the transaction structure.
1067 */
1068 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
1069 xfs_trans_cancel(tp, 0);
1070 break;
1071 }
1072 xfs_ilock(ip, XFS_ILOCK_EXCL);
1073 error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks,
1074 0, quota_flag);
1075 if (error)
1076 goto error1;
1077
1078 xfs_trans_ijoin(tp, ip, 0);
1079
1080 xfs_bmap_init(&free_list, &firstfsb);
1081 error = xfs_bmapi_write(tp, ip, startoffset_fsb,
1082 allocatesize_fsb, alloc_type, &firstfsb,
1083 0, imapp, &nimaps, &free_list);
1084 if (error) {
1085 goto error0;
1086 }
1087
1088 /*
1089 * Complete the transaction
1090 */
1091 error = xfs_bmap_finish(&tp, &free_list, &committed);
1092 if (error) {
1093 goto error0;
1094 }
1095
1096 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1097 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1098 if (error) {
1099 break;
1100 }
1101
1102 allocated_fsb = imapp->br_blockcount;
1103
1104 if (nimaps == 0) {
1105 error = XFS_ERROR(ENOSPC);
1106 break;
1107 }
1108
1109 startoffset_fsb += allocated_fsb;
1110 allocatesize_fsb -= allocated_fsb;
1111 }
1112
1113 return error;
1114
1115error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
1116 xfs_bmap_cancel(&free_list);
1117 xfs_trans_unreserve_quota_nblks(tp, ip, (long)qblocks, 0, quota_flag);
1118
1119error1: /* Just cancel transaction */
1120 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
1121 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1122 return error;
1123}
1124
1125/*
1126 * Zero file bytes between startoff and endoff inclusive.
1127 * The iolock is held exclusive and no blocks are buffered.
1128 *
1129 * This function is used by xfs_free_file_space() to zero
1130 * partial blocks when the range to free is not block aligned.
1131 * When unreserving space with boundaries that are not block
1132 * aligned we round up the start and round down the end
1133 * boundaries and then use this function to zero the parts of
1134 * the blocks that got dropped during the rounding.
1135 */
1136STATIC int
1137xfs_zero_remaining_bytes(
1138 xfs_inode_t *ip,
1139 xfs_off_t startoff,
1140 xfs_off_t endoff)
1141{
1142 xfs_bmbt_irec_t imap;
1143 xfs_fileoff_t offset_fsb;
1144 xfs_off_t lastoffset;
1145 xfs_off_t offset;
1146 xfs_buf_t *bp;
1147 xfs_mount_t *mp = ip->i_mount;
1148 int nimap;
1149 int error = 0;
1150
1151 /*
1152 * Avoid doing I/O beyond eof - it's not necessary
1153 * since nothing can read beyond eof. The space will
1154 * be zeroed when the file is extended anyway.
1155 */
1156 if (startoff >= XFS_ISIZE(ip))
1157 return 0;
1158
1159 if (endoff > XFS_ISIZE(ip))
1160 endoff = XFS_ISIZE(ip);
1161
1162 bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ?
1163 mp->m_rtdev_targp : mp->m_ddev_targp,
1164 BTOBB(mp->m_sb.sb_blocksize), 0);
1165 if (!bp)
1166 return XFS_ERROR(ENOMEM);
1167
1168 xfs_buf_unlock(bp);
1169
1170 for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
1171 offset_fsb = XFS_B_TO_FSBT(mp, offset);
1172 nimap = 1;
1173 error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0);
1174 if (error || nimap < 1)
1175 break;
1176 ASSERT(imap.br_blockcount >= 1);
1177 ASSERT(imap.br_startoff == offset_fsb);
1178 lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1;
1179 if (lastoffset > endoff)
1180 lastoffset = endoff;
1181 if (imap.br_startblock == HOLESTARTBLOCK)
1182 continue;
1183 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
1184 if (imap.br_state == XFS_EXT_UNWRITTEN)
1185 continue;
1186 XFS_BUF_UNDONE(bp);
1187 XFS_BUF_UNWRITE(bp);
1188 XFS_BUF_READ(bp);
1189 XFS_BUF_SET_ADDR(bp, xfs_fsb_to_db(ip, imap.br_startblock));
1190 xfsbdstrat(mp, bp);
1191 error = xfs_buf_iowait(bp);
1192 if (error) {
1193 xfs_buf_ioerror_alert(bp,
1194 "xfs_zero_remaining_bytes(read)");
1195 break;
1196 }
1197 memset(bp->b_addr +
1198 (offset - XFS_FSB_TO_B(mp, imap.br_startoff)),
1199 0, lastoffset - offset + 1);
1200 XFS_BUF_UNDONE(bp);
1201 XFS_BUF_UNREAD(bp);
1202 XFS_BUF_WRITE(bp);
1203 xfsbdstrat(mp, bp);
1204 error = xfs_buf_iowait(bp);
1205 if (error) {
1206 xfs_buf_ioerror_alert(bp,
1207 "xfs_zero_remaining_bytes(write)");
1208 break;
1209 }
1210 }
1211 xfs_buf_free(bp);
1212 return error;
1213}
1214
Christoph Hellwig83aee9e2013-10-12 00:55:07 -07001215int
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001216xfs_free_file_space(
Christoph Hellwig83aee9e2013-10-12 00:55:07 -07001217 struct xfs_inode *ip,
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001218 xfs_off_t offset,
Christoph Hellwig5f8aca82013-10-12 00:55:06 -07001219 xfs_off_t len)
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001220{
1221 int committed;
1222 int done;
1223 xfs_fileoff_t endoffset_fsb;
1224 int error;
1225 xfs_fsblock_t firstfsb;
1226 xfs_bmap_free_t free_list;
1227 xfs_bmbt_irec_t imap;
1228 xfs_off_t ioffset;
1229 xfs_extlen_t mod=0;
1230 xfs_mount_t *mp;
1231 int nimap;
1232 uint resblks;
1233 xfs_off_t rounding;
1234 int rt;
1235 xfs_fileoff_t startoffset_fsb;
1236 xfs_trans_t *tp;
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001237
1238 mp = ip->i_mount;
1239
1240 trace_xfs_free_file_space(ip);
1241
1242 error = xfs_qm_dqattach(ip, 0);
1243 if (error)
1244 return error;
1245
1246 error = 0;
1247 if (len <= 0) /* if nothing being freed */
1248 return error;
1249 rt = XFS_IS_REALTIME_INODE(ip);
1250 startoffset_fsb = XFS_B_TO_FSB(mp, offset);
1251 endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len);
1252
Christoph Hellwig5f8aca82013-10-12 00:55:06 -07001253 /* wait for the completion of any pending DIOs */
1254 inode_dio_wait(VFS_I(ip));
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001255
1256 rounding = max_t(xfs_off_t, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
1257 ioffset = offset & ~(rounding - 1);
1258 error = -filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
1259 ioffset, -1);
1260 if (error)
Christoph Hellwig5f8aca82013-10-12 00:55:06 -07001261 goto out;
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001262 truncate_pagecache_range(VFS_I(ip), ioffset, -1);
1263
1264 /*
1265 * Need to zero the stuff we're not freeing, on disk.
1266 * If it's a realtime file & can't use unwritten extents then we
1267 * actually need to zero the extent edges. Otherwise xfs_bunmapi
1268 * will take care of it for us.
1269 */
1270 if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
1271 nimap = 1;
1272 error = xfs_bmapi_read(ip, startoffset_fsb, 1,
1273 &imap, &nimap, 0);
1274 if (error)
Christoph Hellwig5f8aca82013-10-12 00:55:06 -07001275 goto out;
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001276 ASSERT(nimap == 0 || nimap == 1);
1277 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
1278 xfs_daddr_t block;
1279
1280 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
1281 block = imap.br_startblock;
1282 mod = do_div(block, mp->m_sb.sb_rextsize);
1283 if (mod)
1284 startoffset_fsb += mp->m_sb.sb_rextsize - mod;
1285 }
1286 nimap = 1;
1287 error = xfs_bmapi_read(ip, endoffset_fsb - 1, 1,
1288 &imap, &nimap, 0);
1289 if (error)
Christoph Hellwig5f8aca82013-10-12 00:55:06 -07001290 goto out;
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001291 ASSERT(nimap == 0 || nimap == 1);
1292 if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
1293 ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
1294 mod++;
1295 if (mod && (mod != mp->m_sb.sb_rextsize))
1296 endoffset_fsb -= mod;
1297 }
1298 }
1299 if ((done = (endoffset_fsb <= startoffset_fsb)))
1300 /*
1301 * One contiguous piece to clear
1302 */
1303 error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1);
1304 else {
1305 /*
1306 * Some full blocks, possibly two pieces to clear
1307 */
1308 if (offset < XFS_FSB_TO_B(mp, startoffset_fsb))
1309 error = xfs_zero_remaining_bytes(ip, offset,
1310 XFS_FSB_TO_B(mp, startoffset_fsb) - 1);
1311 if (!error &&
1312 XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len)
1313 error = xfs_zero_remaining_bytes(ip,
1314 XFS_FSB_TO_B(mp, endoffset_fsb),
1315 offset + len - 1);
1316 }
1317
1318 /*
1319 * free file space until done or until there is an error
1320 */
1321 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
1322 while (!error && !done) {
1323
1324 /*
1325 * allocate and setup the transaction. Allow this
1326 * transaction to dip into the reserve blocks to ensure
1327 * the freeing of the space succeeds at ENOSPC.
1328 */
1329 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
1330 tp->t_flags |= XFS_TRANS_RESERVE;
Jie Liu3d3c8b52013-08-12 20:49:59 +10001331 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_write, resblks, 0);
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001332
1333 /*
1334 * check for running out of space
1335 */
1336 if (error) {
1337 /*
1338 * Free the transaction structure.
1339 */
1340 ASSERT(error == ENOSPC || XFS_FORCED_SHUTDOWN(mp));
1341 xfs_trans_cancel(tp, 0);
1342 break;
1343 }
1344 xfs_ilock(ip, XFS_ILOCK_EXCL);
1345 error = xfs_trans_reserve_quota(tp, mp,
1346 ip->i_udquot, ip->i_gdquot, ip->i_pdquot,
1347 resblks, 0, XFS_QMOPT_RES_REGBLKS);
1348 if (error)
1349 goto error1;
1350
1351 xfs_trans_ijoin(tp, ip, 0);
1352
1353 /*
1354 * issue the bunmapi() call to free the blocks
1355 */
1356 xfs_bmap_init(&free_list, &firstfsb);
1357 error = xfs_bunmapi(tp, ip, startoffset_fsb,
1358 endoffset_fsb - startoffset_fsb,
1359 0, 2, &firstfsb, &free_list, &done);
1360 if (error) {
1361 goto error0;
1362 }
1363
1364 /*
1365 * complete the transaction
1366 */
1367 error = xfs_bmap_finish(&tp, &free_list, &committed);
1368 if (error) {
1369 goto error0;
1370 }
1371
1372 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
1373 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1374 }
1375
Christoph Hellwig5f8aca82013-10-12 00:55:06 -07001376 out:
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001377 return error;
1378
1379 error0:
1380 xfs_bmap_cancel(&free_list);
1381 error1:
1382 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
Christoph Hellwig5f8aca82013-10-12 00:55:06 -07001383 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1384 goto out;
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001385}
1386
1387
Christoph Hellwig865e9442013-10-12 00:55:08 -07001388int
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001389xfs_zero_file_space(
1390 struct xfs_inode *ip,
1391 xfs_off_t offset,
Christoph Hellwig5f8aca82013-10-12 00:55:06 -07001392 xfs_off_t len)
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001393{
1394 struct xfs_mount *mp = ip->i_mount;
1395 uint granularity;
1396 xfs_off_t start_boundary;
1397 xfs_off_t end_boundary;
1398 int error;
1399
1400 granularity = max_t(uint, 1 << mp->m_sb.sb_blocklog, PAGE_CACHE_SIZE);
1401
1402 /*
1403 * Round the range of extents we are going to convert inwards. If the
1404 * offset is aligned, then it doesn't get changed so we zero from the
1405 * start of the block offset points to.
1406 */
1407 start_boundary = round_up(offset, granularity);
1408 end_boundary = round_down(offset + len, granularity);
1409
1410 ASSERT(start_boundary >= offset);
1411 ASSERT(end_boundary <= offset + len);
1412
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001413 if (start_boundary < end_boundary - 1) {
1414 /* punch out the page cache over the conversion range */
1415 truncate_pagecache_range(VFS_I(ip), start_boundary,
1416 end_boundary - 1);
1417 /* convert the blocks */
1418 error = xfs_alloc_file_space(ip, start_boundary,
1419 end_boundary - start_boundary - 1,
Christoph Hellwig5f8aca82013-10-12 00:55:06 -07001420 XFS_BMAPI_PREALLOC | XFS_BMAPI_CONVERT);
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001421 if (error)
Christoph Hellwig5f8aca82013-10-12 00:55:06 -07001422 goto out;
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001423
1424 /* We've handled the interior of the range, now for the edges */
Christoph Hellwig5f8aca82013-10-12 00:55:06 -07001425 if (start_boundary != offset) {
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001426 error = xfs_iozero(ip, offset, start_boundary - offset);
Christoph Hellwig5f8aca82013-10-12 00:55:06 -07001427 if (error)
1428 goto out;
1429 }
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001430
1431 if (end_boundary != offset + len)
1432 error = xfs_iozero(ip, end_boundary,
1433 offset + len - end_boundary);
1434
1435 } else {
1436 /*
1437 * It's either a sub-granularity range or the range spanned lies
1438 * partially across two adjacent blocks.
1439 */
1440 error = xfs_iozero(ip, offset, len);
1441 }
1442
Christoph Hellwig5f8aca82013-10-12 00:55:06 -07001443out:
Dave Chinnerc24b5df2013-08-12 20:49:45 +10001444 return error;
1445
1446}
1447
1448/*
Dave Chinnera133d952013-08-12 20:49:48 +10001449 * We need to check that the format of the data fork in the temporary inode is
1450 * valid for the target inode before doing the swap. This is not a problem with
1451 * attr1 because of the fixed fork offset, but attr2 has a dynamically sized
1452 * data fork depending on the space the attribute fork is taking so we can get
1453 * invalid formats on the target inode.
1454 *
1455 * E.g. target has space for 7 extents in extent format, temp inode only has
1456 * space for 6. If we defragment down to 7 extents, then the tmp format is a
1457 * btree, but when swapped it needs to be in extent format. Hence we can't just
1458 * blindly swap data forks on attr2 filesystems.
1459 *
1460 * Note that we check the swap in both directions so that we don't end up with
1461 * a corrupt temporary inode, either.
1462 *
1463 * Note that fixing the way xfs_fsr sets up the attribute fork in the source
1464 * inode will prevent this situation from occurring, so all we do here is
1465 * reject and log the attempt. basically we are putting the responsibility on
1466 * userspace to get this right.
1467 */
1468static int
1469xfs_swap_extents_check_format(
1470 xfs_inode_t *ip, /* target inode */
1471 xfs_inode_t *tip) /* tmp inode */
1472{
1473
1474 /* Should never get a local format */
1475 if (ip->i_d.di_format == XFS_DINODE_FMT_LOCAL ||
1476 tip->i_d.di_format == XFS_DINODE_FMT_LOCAL)
1477 return EINVAL;
1478
1479 /*
1480 * if the target inode has less extents that then temporary inode then
1481 * why did userspace call us?
1482 */
1483 if (ip->i_d.di_nextents < tip->i_d.di_nextents)
1484 return EINVAL;
1485
1486 /*
1487 * if the target inode is in extent form and the temp inode is in btree
1488 * form then we will end up with the target inode in the wrong format
1489 * as we already know there are less extents in the temp inode.
1490 */
1491 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1492 tip->i_d.di_format == XFS_DINODE_FMT_BTREE)
1493 return EINVAL;
1494
1495 /* Check temp in extent form to max in target */
1496 if (tip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1497 XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) >
1498 XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK))
1499 return EINVAL;
1500
1501 /* Check target in extent form to max in temp */
1502 if (ip->i_d.di_format == XFS_DINODE_FMT_EXTENTS &&
1503 XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) >
1504 XFS_IFORK_MAXEXT(tip, XFS_DATA_FORK))
1505 return EINVAL;
1506
1507 /*
1508 * If we are in a btree format, check that the temp root block will fit
1509 * in the target and that it has enough extents to be in btree format
1510 * in the target.
1511 *
1512 * Note that we have to be careful to allow btree->extent conversions
1513 * (a common defrag case) which will occur when the temp inode is in
1514 * extent format...
1515 */
1516 if (tip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
1517 if (XFS_IFORK_BOFF(ip) &&
1518 XFS_BMAP_BMDR_SPACE(tip->i_df.if_broot) > XFS_IFORK_BOFF(ip))
1519 return EINVAL;
1520 if (XFS_IFORK_NEXTENTS(tip, XFS_DATA_FORK) <=
1521 XFS_IFORK_MAXEXT(ip, XFS_DATA_FORK))
1522 return EINVAL;
1523 }
1524
1525 /* Reciprocal target->temp btree format checks */
1526 if (ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
1527 if (XFS_IFORK_BOFF(tip) &&
1528 XFS_BMAP_BMDR_SPACE(ip->i_df.if_broot) > XFS_IFORK_BOFF(tip))
1529 return EINVAL;
1530 if (XFS_IFORK_NEXTENTS(ip, XFS_DATA_FORK) <=
1531 XFS_IFORK_MAXEXT(tip, XFS_DATA_FORK))
1532 return EINVAL;
1533 }
1534
1535 return 0;
1536}
1537
1538int
1539xfs_swap_extents(
1540 xfs_inode_t *ip, /* target inode */
1541 xfs_inode_t *tip, /* tmp inode */
1542 xfs_swapext_t *sxp)
1543{
1544 xfs_mount_t *mp = ip->i_mount;
1545 xfs_trans_t *tp;
1546 xfs_bstat_t *sbp = &sxp->sx_stat;
1547 xfs_ifork_t *tempifp, *ifp, *tifp;
1548 int src_log_flags, target_log_flags;
1549 int error = 0;
1550 int aforkblks = 0;
1551 int taforkblks = 0;
1552 __uint64_t tmp;
1553
Dave Chinnera133d952013-08-12 20:49:48 +10001554 tempifp = kmem_alloc(sizeof(xfs_ifork_t), KM_MAYFAIL);
1555 if (!tempifp) {
1556 error = XFS_ERROR(ENOMEM);
1557 goto out;
1558 }
1559
1560 /*
1561 * we have to do two separate lock calls here to keep lockdep
1562 * happy. If we try to get all the locks in one call, lock will
1563 * report false positives when we drop the ILOCK and regain them
1564 * below.
1565 */
1566 xfs_lock_two_inodes(ip, tip, XFS_IOLOCK_EXCL);
1567 xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
1568
1569 /* Verify that both files have the same format */
1570 if ((ip->i_d.di_mode & S_IFMT) != (tip->i_d.di_mode & S_IFMT)) {
1571 error = XFS_ERROR(EINVAL);
1572 goto out_unlock;
1573 }
1574
1575 /* Verify both files are either real-time or non-realtime */
1576 if (XFS_IS_REALTIME_INODE(ip) != XFS_IS_REALTIME_INODE(tip)) {
1577 error = XFS_ERROR(EINVAL);
1578 goto out_unlock;
1579 }
1580
1581 error = -filemap_write_and_wait(VFS_I(tip)->i_mapping);
1582 if (error)
1583 goto out_unlock;
1584 truncate_pagecache_range(VFS_I(tip), 0, -1);
1585
1586 /* Verify O_DIRECT for ftmp */
1587 if (VN_CACHED(VFS_I(tip)) != 0) {
1588 error = XFS_ERROR(EINVAL);
1589 goto out_unlock;
1590 }
1591
1592 /* Verify all data are being swapped */
1593 if (sxp->sx_offset != 0 ||
1594 sxp->sx_length != ip->i_d.di_size ||
1595 sxp->sx_length != tip->i_d.di_size) {
1596 error = XFS_ERROR(EFAULT);
1597 goto out_unlock;
1598 }
1599
1600 trace_xfs_swap_extent_before(ip, 0);
1601 trace_xfs_swap_extent_before(tip, 1);
1602
1603 /* check inode formats now that data is flushed */
1604 error = xfs_swap_extents_check_format(ip, tip);
1605 if (error) {
1606 xfs_notice(mp,
1607 "%s: inode 0x%llx format is incompatible for exchanging.",
1608 __func__, ip->i_ino);
1609 goto out_unlock;
1610 }
1611
1612 /*
1613 * Compare the current change & modify times with that
1614 * passed in. If they differ, we abort this swap.
1615 * This is the mechanism used to ensure the calling
1616 * process that the file was not changed out from
1617 * under it.
1618 */
1619 if ((sbp->bs_ctime.tv_sec != VFS_I(ip)->i_ctime.tv_sec) ||
1620 (sbp->bs_ctime.tv_nsec != VFS_I(ip)->i_ctime.tv_nsec) ||
1621 (sbp->bs_mtime.tv_sec != VFS_I(ip)->i_mtime.tv_sec) ||
1622 (sbp->bs_mtime.tv_nsec != VFS_I(ip)->i_mtime.tv_nsec)) {
1623 error = XFS_ERROR(EBUSY);
1624 goto out_unlock;
1625 }
1626
1627 /* We need to fail if the file is memory mapped. Once we have tossed
1628 * all existing pages, the page fault will have no option
1629 * but to go to the filesystem for pages. By making the page fault call
1630 * vop_read (or write in the case of autogrow) they block on the iolock
1631 * until we have switched the extents.
1632 */
1633 if (VN_MAPPED(VFS_I(ip))) {
1634 error = XFS_ERROR(EBUSY);
1635 goto out_unlock;
1636 }
1637
1638 xfs_iunlock(ip, XFS_ILOCK_EXCL);
1639 xfs_iunlock(tip, XFS_ILOCK_EXCL);
1640
1641 /*
1642 * There is a race condition here since we gave up the
1643 * ilock. However, the data fork will not change since
1644 * we have the iolock (locked for truncation too) so we
1645 * are safe. We don't really care if non-io related
1646 * fields change.
1647 */
1648 truncate_pagecache_range(VFS_I(ip), 0, -1);
1649
1650 tp = xfs_trans_alloc(mp, XFS_TRANS_SWAPEXT);
Jie Liu3d3c8b52013-08-12 20:49:59 +10001651 error = xfs_trans_reserve(tp, &M_RES(mp)->tr_ichange, 0, 0);
1652 if (error) {
Dave Chinnera133d952013-08-12 20:49:48 +10001653 xfs_iunlock(ip, XFS_IOLOCK_EXCL);
1654 xfs_iunlock(tip, XFS_IOLOCK_EXCL);
1655 xfs_trans_cancel(tp, 0);
1656 goto out;
1657 }
1658 xfs_lock_two_inodes(ip, tip, XFS_ILOCK_EXCL);
1659
1660 /*
1661 * Count the number of extended attribute blocks
1662 */
1663 if ( ((XFS_IFORK_Q(ip) != 0) && (ip->i_d.di_anextents > 0)) &&
1664 (ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
1665 error = xfs_bmap_count_blocks(tp, ip, XFS_ATTR_FORK, &aforkblks);
1666 if (error)
1667 goto out_trans_cancel;
1668 }
1669 if ( ((XFS_IFORK_Q(tip) != 0) && (tip->i_d.di_anextents > 0)) &&
1670 (tip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL)) {
1671 error = xfs_bmap_count_blocks(tp, tip, XFS_ATTR_FORK,
1672 &taforkblks);
1673 if (error)
1674 goto out_trans_cancel;
1675 }
1676
Dave Chinner21b5c972013-08-30 10:23:44 +10001677 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1678 xfs_trans_ijoin(tp, tip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1679
1680 /*
1681 * Before we've swapped the forks, lets set the owners of the forks
1682 * appropriately. We have to do this as we are demand paging the btree
1683 * buffers, and so the validation done on read will expect the owner
1684 * field to be correctly set. Once we change the owners, we can swap the
1685 * inode forks.
1686 *
1687 * Note the trickiness in setting the log flags - we set the owner log
1688 * flag on the opposite inode (i.e. the inode we are setting the new
1689 * owner to be) because once we swap the forks and log that, log
1690 * recovery is going to see the fork as owned by the swapped inode,
1691 * not the pre-swapped inodes.
1692 */
1693 src_log_flags = XFS_ILOG_CORE;
1694 target_log_flags = XFS_ILOG_CORE;
1695 if (ip->i_d.di_version == 3 &&
1696 ip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
Dave Chinner638f44162013-08-30 10:23:45 +10001697 target_log_flags |= XFS_ILOG_DOWNER;
1698 error = xfs_bmbt_change_owner(tp, ip, XFS_DATA_FORK,
1699 tip->i_ino, NULL);
Dave Chinner21b5c972013-08-30 10:23:44 +10001700 if (error)
1701 goto out_trans_cancel;
1702 }
1703
1704 if (tip->i_d.di_version == 3 &&
1705 tip->i_d.di_format == XFS_DINODE_FMT_BTREE) {
Dave Chinner638f44162013-08-30 10:23:45 +10001706 src_log_flags |= XFS_ILOG_DOWNER;
1707 error = xfs_bmbt_change_owner(tp, tip, XFS_DATA_FORK,
1708 ip->i_ino, NULL);
Dave Chinner21b5c972013-08-30 10:23:44 +10001709 if (error)
1710 goto out_trans_cancel;
1711 }
1712
Dave Chinnera133d952013-08-12 20:49:48 +10001713 /*
1714 * Swap the data forks of the inodes
1715 */
1716 ifp = &ip->i_df;
1717 tifp = &tip->i_df;
1718 *tempifp = *ifp; /* struct copy */
1719 *ifp = *tifp; /* struct copy */
1720 *tifp = *tempifp; /* struct copy */
1721
1722 /*
1723 * Fix the on-disk inode values
1724 */
1725 tmp = (__uint64_t)ip->i_d.di_nblocks;
1726 ip->i_d.di_nblocks = tip->i_d.di_nblocks - taforkblks + aforkblks;
1727 tip->i_d.di_nblocks = tmp + taforkblks - aforkblks;
1728
1729 tmp = (__uint64_t) ip->i_d.di_nextents;
1730 ip->i_d.di_nextents = tip->i_d.di_nextents;
1731 tip->i_d.di_nextents = tmp;
1732
1733 tmp = (__uint64_t) ip->i_d.di_format;
1734 ip->i_d.di_format = tip->i_d.di_format;
1735 tip->i_d.di_format = tmp;
1736
1737 /*
1738 * The extents in the source inode could still contain speculative
1739 * preallocation beyond EOF (e.g. the file is open but not modified
1740 * while defrag is in progress). In that case, we need to copy over the
1741 * number of delalloc blocks the data fork in the source inode is
1742 * tracking beyond EOF so that when the fork is truncated away when the
1743 * temporary inode is unlinked we don't underrun the i_delayed_blks
1744 * counter on that inode.
1745 */
1746 ASSERT(tip->i_delayed_blks == 0);
1747 tip->i_delayed_blks = ip->i_delayed_blks;
1748 ip->i_delayed_blks = 0;
1749
Dave Chinnera133d952013-08-12 20:49:48 +10001750 switch (ip->i_d.di_format) {
1751 case XFS_DINODE_FMT_EXTENTS:
1752 /* If the extents fit in the inode, fix the
1753 * pointer. Otherwise it's already NULL or
1754 * pointing to the extent.
1755 */
1756 if (ip->i_d.di_nextents <= XFS_INLINE_EXTS) {
1757 ifp->if_u1.if_extents =
1758 ifp->if_u2.if_inline_ext;
1759 }
1760 src_log_flags |= XFS_ILOG_DEXT;
1761 break;
1762 case XFS_DINODE_FMT_BTREE:
Dave Chinner21b5c972013-08-30 10:23:44 +10001763 ASSERT(ip->i_d.di_version < 3 ||
Dave Chinner638f44162013-08-30 10:23:45 +10001764 (src_log_flags & XFS_ILOG_DOWNER));
Dave Chinnera133d952013-08-12 20:49:48 +10001765 src_log_flags |= XFS_ILOG_DBROOT;
1766 break;
1767 }
1768
Dave Chinnera133d952013-08-12 20:49:48 +10001769 switch (tip->i_d.di_format) {
1770 case XFS_DINODE_FMT_EXTENTS:
1771 /* If the extents fit in the inode, fix the
1772 * pointer. Otherwise it's already NULL or
1773 * pointing to the extent.
1774 */
1775 if (tip->i_d.di_nextents <= XFS_INLINE_EXTS) {
1776 tifp->if_u1.if_extents =
1777 tifp->if_u2.if_inline_ext;
1778 }
1779 target_log_flags |= XFS_ILOG_DEXT;
1780 break;
1781 case XFS_DINODE_FMT_BTREE:
1782 target_log_flags |= XFS_ILOG_DBROOT;
Dave Chinner21b5c972013-08-30 10:23:44 +10001783 ASSERT(tip->i_d.di_version < 3 ||
Dave Chinner638f44162013-08-30 10:23:45 +10001784 (target_log_flags & XFS_ILOG_DOWNER));
Dave Chinnera133d952013-08-12 20:49:48 +10001785 break;
1786 }
1787
Dave Chinnera133d952013-08-12 20:49:48 +10001788 xfs_trans_log_inode(tp, ip, src_log_flags);
1789 xfs_trans_log_inode(tp, tip, target_log_flags);
1790
1791 /*
1792 * If this is a synchronous mount, make sure that the
1793 * transaction goes to disk before returning to the user.
1794 */
1795 if (mp->m_flags & XFS_MOUNT_WSYNC)
1796 xfs_trans_set_sync(tp);
1797
1798 error = xfs_trans_commit(tp, 0);
1799
1800 trace_xfs_swap_extent_after(ip, 0);
1801 trace_xfs_swap_extent_after(tip, 1);
1802out:
1803 kmem_free(tempifp);
1804 return error;
1805
1806out_unlock:
1807 xfs_iunlock(ip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1808 xfs_iunlock(tip, XFS_ILOCK_EXCL | XFS_IOLOCK_EXCL);
1809 goto out;
1810
1811out_trans_cancel:
1812 xfs_trans_cancel(tp, 0);
1813 goto out_unlock;
1814}