blob: 08ce72316bfebee19ef8387b123760439da2636f [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
Olaf Weber3e57ecf2006-06-09 14:48:12 +10002 * Copyright (c) 2000-2006 Silicon Graphics, Inc.
Nathan Scott7b718762005-11-02 14:58:39 +11003 * All Rights Reserved.
Linus Torvalds1da177e2005-04-16 15:20:36 -07004 *
Nathan Scott7b718762005-11-02 14:58:39 +11005 * This program is free software; you can redistribute it and/or
6 * modify it under the terms of the GNU General Public License as
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * published by the Free Software Foundation.
8 *
Nathan Scott7b718762005-11-02 14:58:39 +11009 * This program is distributed in the hope that it would be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
Linus Torvalds1da177e2005-04-16 15:20:36 -070013 *
Nathan Scott7b718762005-11-02 14:58:39 +110014 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write the Free Software Foundation,
16 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 */
Linus Torvalds1da177e2005-04-16 15:20:36 -070018#include "xfs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include "xfs_fs.h"
Nathan Scotta844f452005-11-02 14:38:42 +110020#include "xfs_bit.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070021#include "xfs_log.h"
Nathan Scotta844f452005-11-02 14:38:42 +110022#include "xfs_inum.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070023#include "xfs_trans.h"
24#include "xfs_sb.h"
25#include "xfs_ag.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include "xfs_dir2.h"
27#include "xfs_alloc.h"
28#include "xfs_dmapi.h"
29#include "xfs_quota.h"
30#include "xfs_mount.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include "xfs_bmap_btree.h"
Nathan Scotta844f452005-11-02 14:38:42 +110032#include "xfs_alloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070033#include "xfs_ialloc_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070034#include "xfs_dir2_sf.h"
Nathan Scotta844f452005-11-02 14:38:42 +110035#include "xfs_attr_sf.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070036#include "xfs_dinode.h"
37#include "xfs_inode.h"
Nathan Scotta844f452005-11-02 14:38:42 +110038#include "xfs_ialloc.h"
39#include "xfs_btree.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070040#include "xfs_bmap.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070041#include "xfs_rtalloc.h"
42#include "xfs_error.h"
43#include "xfs_itable.h"
44#include "xfs_rw.h"
45#include "xfs_acl.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070046#include "xfs_attr.h"
47#include "xfs_buf_item.h"
48#include "xfs_trans_space.h"
49#include "xfs_utils.h"
50#include "xfs_iomap.h"
51
52#if defined(XFS_RW_TRACE)
53void
54xfs_iomap_enter_trace(
55 int tag,
Lachlan McIlroy541d7d32007-10-11 17:34:33 +100056 xfs_inode_t *ip,
Linus Torvalds1da177e2005-04-16 15:20:36 -070057 xfs_off_t offset,
58 ssize_t count)
59{
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 if (!ip->i_rwtrace)
61 return;
62
63 ktrace_enter(ip->i_rwtrace,
64 (void *)((unsigned long)tag),
65 (void *)ip,
66 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
67 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
68 (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
69 (void *)((unsigned long)(offset & 0xffffffff)),
70 (void *)((unsigned long)count),
Christoph Hellwig613d7042007-10-11 17:44:08 +100071 (void *)((unsigned long)((ip->i_new_size >> 32) & 0xffffffff)),
72 (void *)((unsigned long)(ip->i_new_size & 0xffffffff)),
Yingping Luf1fdc842006-03-22 12:44:15 +110073 (void *)((unsigned long)current_pid()),
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 (void *)NULL,
75 (void *)NULL,
76 (void *)NULL,
77 (void *)NULL,
78 (void *)NULL,
79 (void *)NULL);
80}
81
82void
83xfs_iomap_map_trace(
84 int tag,
Lachlan McIlroy541d7d32007-10-11 17:34:33 +100085 xfs_inode_t *ip,
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 xfs_off_t offset,
87 ssize_t count,
88 xfs_iomap_t *iomapp,
89 xfs_bmbt_irec_t *imapp,
90 int flags)
91{
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 if (!ip->i_rwtrace)
93 return;
94
95 ktrace_enter(ip->i_rwtrace,
96 (void *)((unsigned long)tag),
97 (void *)ip,
98 (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)),
99 (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)),
100 (void *)((unsigned long)((offset >> 32) & 0xffffffff)),
101 (void *)((unsigned long)(offset & 0xffffffff)),
102 (void *)((unsigned long)count),
103 (void *)((unsigned long)flags),
104 (void *)((unsigned long)((iomapp->iomap_offset >> 32) & 0xffffffff)),
105 (void *)((unsigned long)(iomapp->iomap_offset & 0xffffffff)),
106 (void *)((unsigned long)(iomapp->iomap_delta)),
107 (void *)((unsigned long)(iomapp->iomap_bsize)),
108 (void *)((unsigned long)(iomapp->iomap_bn)),
109 (void *)(__psint_t)(imapp->br_startoff),
110 (void *)((unsigned long)(imapp->br_blockcount)),
111 (void *)(__psint_t)(imapp->br_startblock));
112}
113#else
114#define xfs_iomap_enter_trace(tag, io, offset, count)
115#define xfs_iomap_map_trace(tag, io, offset, count, iomapp, imapp, flags)
116#endif
117
118#define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \
119 << mp->m_writeio_log)
120#define XFS_STRAT_WRITE_IMAPS 2
121#define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP
122
123STATIC int
124xfs_imap_to_bmap(
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000125 xfs_inode_t *ip,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 xfs_off_t offset,
127 xfs_bmbt_irec_t *imap,
128 xfs_iomap_t *iomapp,
129 int imaps, /* Number of imap entries */
130 int iomaps, /* Number of iomap entries */
131 int flags)
132{
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000133 xfs_mount_t *mp = ip->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134 int pbm;
135 xfs_fsblock_t start_block;
136
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137
138 for (pbm = 0; imaps && pbm < iomaps; imaps--, iomapp++, imap++, pbm++) {
139 iomapp->iomap_offset = XFS_FSB_TO_B(mp, imap->br_startoff);
140 iomapp->iomap_delta = offset - iomapp->iomap_offset;
141 iomapp->iomap_bsize = XFS_FSB_TO_B(mp, imap->br_blockcount);
142 iomapp->iomap_flags = flags;
143
Eric Sandeen71ddabb2007-11-23 16:29:42 +1100144 if (XFS_IS_REALTIME_INODE(ip)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 iomapp->iomap_flags |= IOMAP_REALTIME;
146 iomapp->iomap_target = mp->m_rtdev_targp;
147 } else {
148 iomapp->iomap_target = mp->m_ddev_targp;
149 }
150 start_block = imap->br_startblock;
151 if (start_block == HOLESTARTBLOCK) {
152 iomapp->iomap_bn = IOMAP_DADDR_NULL;
153 iomapp->iomap_flags |= IOMAP_HOLE;
154 } else if (start_block == DELAYSTARTBLOCK) {
155 iomapp->iomap_bn = IOMAP_DADDR_NULL;
156 iomapp->iomap_flags |= IOMAP_DELAY;
157 } else {
Eric Sandeenb6e32222009-01-14 23:22:07 -0600158 iomapp->iomap_bn = xfs_fsb_to_db(ip, start_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 if (ISUNWRITTEN(imap))
160 iomapp->iomap_flags |= IOMAP_UNWRITTEN;
161 }
162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 offset += iomapp->iomap_bsize - iomapp->iomap_delta;
164 }
165 return pbm; /* Return the number filled */
166}
167
168int
169xfs_iomap(
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000170 xfs_inode_t *ip,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 xfs_off_t offset,
172 ssize_t count,
173 int flags,
174 xfs_iomap_t *iomapp,
175 int *niomaps)
176{
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000177 xfs_mount_t *mp = ip->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 xfs_fileoff_t offset_fsb, end_fsb;
179 int error = 0;
180 int lockmode = 0;
181 xfs_bmbt_irec_t imap;
182 int nimaps = 1;
183 int bmapi_flags = 0;
184 int iomap_flags = 0;
185
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000186 ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFREG);
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000187
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 if (XFS_FORCED_SHUTDOWN(mp))
189 return XFS_ERROR(EIO);
190
Christoph Hellwig76428612007-09-14 15:23:31 +1000191 switch (flags & (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 case BMAPI_READ:
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000193 xfs_iomap_enter_trace(XFS_IOMAP_READ_ENTER, ip, offset, count);
194 lockmode = xfs_ilock_map_shared(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 bmapi_flags = XFS_BMAPI_ENTIRE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 break;
197 case BMAPI_WRITE:
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000198 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, ip, offset, count);
Christoph Hellwig579aa9c2008-04-22 17:34:00 +1000199 lockmode = XFS_ILOCK_EXCL;
Nathan Scottc31e8872005-09-05 10:06:55 +1000200 if (flags & BMAPI_IGNSTATE)
201 bmapi_flags |= XFS_BMAPI_IGSTATE|XFS_BMAPI_ENTIRE;
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000202 xfs_ilock(ip, lockmode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 break;
204 case BMAPI_ALLOCATE:
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000205 xfs_iomap_enter_trace(XFS_IOMAP_ALLOC_ENTER, ip, offset, count);
Christoph Hellwig579aa9c2008-04-22 17:34:00 +1000206 lockmode = XFS_ILOCK_SHARED;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 bmapi_flags = XFS_BMAPI_ENTIRE;
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000208
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 /* Attempt non-blocking lock */
210 if (flags & BMAPI_TRYLOCK) {
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000211 if (!xfs_ilock_nowait(ip, lockmode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 return XFS_ERROR(EAGAIN);
213 } else {
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000214 xfs_ilock(ip, lockmode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 }
216 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 default:
218 BUG();
219 }
220
221 ASSERT(offset <= mp->m_maxioffset);
222 if ((xfs_fsize_t)offset + count > mp->m_maxioffset)
223 count = mp->m_maxioffset - offset;
224 end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
225 offset_fsb = XFS_B_TO_FSBT(mp, offset);
226
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000227 error = xfs_bmapi(NULL, ip, offset_fsb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 (xfs_filblks_t)(end_fsb - offset_fsb),
229 bmapi_flags, NULL, 0, &imap,
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000230 &nimaps, NULL, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231
232 if (error)
233 goto out;
234
Christoph Hellwig76428612007-09-14 15:23:31 +1000235 switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 case BMAPI_WRITE:
237 /* If we found an extent, return it */
Russell Cattelan68d14982005-05-06 06:42:22 -0700238 if (nimaps &&
Nathan Scottdd9f4382006-01-11 15:28:28 +1100239 (imap.br_startblock != HOLESTARTBLOCK) &&
Russell Cattelan68d14982005-05-06 06:42:22 -0700240 (imap.br_startblock != DELAYSTARTBLOCK)) {
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000241 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, ip,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 offset, count, iomapp, &imap, flags);
243 break;
244 }
245
246 if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) {
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000247 error = xfs_iomap_write_direct(ip, offset, count, flags,
248 &imap, &nimaps, nimaps);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 } else {
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000250 error = xfs_iomap_write_delay(ip, offset, count, flags,
251 &imap, &nimaps);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 }
253 if (!error) {
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000254 xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, ip,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 offset, count, iomapp, &imap, flags);
256 }
257 iomap_flags = IOMAP_NEW;
258 break;
259 case BMAPI_ALLOCATE:
260 /* If we found an extent, return it */
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000261 xfs_iunlock(ip, lockmode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262 lockmode = 0;
263
Eric Sandeenb6e32222009-01-14 23:22:07 -0600264 if (nimaps && !isnullstartblock(imap.br_startblock)) {
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000265 xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, ip,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 offset, count, iomapp, &imap, flags);
267 break;
268 }
269
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000270 error = xfs_iomap_write_allocate(ip, offset, count,
Nathan Scott24e17b52005-05-05 13:33:20 -0700271 &imap, &nimaps);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 }
274
275 if (nimaps) {
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000276 *niomaps = xfs_imap_to_bmap(ip, offset, &imap,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 iomapp, nimaps, *niomaps, iomap_flags);
278 } else if (niomaps) {
279 *niomaps = 0;
280 }
281
282out:
283 if (lockmode)
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000284 xfs_iunlock(ip, lockmode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 return XFS_ERROR(error);
286}
287
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000288
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289STATIC int
Nathan Scottdd9f4382006-01-11 15:28:28 +1100290xfs_iomap_eof_align_last_fsb(
291 xfs_mount_t *mp,
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000292 xfs_inode_t *ip,
Nathan Scottdd9f4382006-01-11 15:28:28 +1100293 xfs_extlen_t extsize,
294 xfs_fileoff_t *last_fsb)
295{
296 xfs_fileoff_t new_last_fsb = 0;
297 xfs_extlen_t align;
298 int eof, error;
299
Eric Sandeen71ddabb2007-11-23 16:29:42 +1100300 if (XFS_IS_REALTIME_INODE(ip))
Nathan Scottdd9f4382006-01-11 15:28:28 +1100301 ;
302 /*
303 * If mounted with the "-o swalloc" option, roundup the allocation
304 * request to a stripe width boundary if the file size is >=
305 * stripe width and we are allocating past the allocation eof.
306 */
307 else if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC) &&
Lachlan McIlroy9f6c92b2008-12-22 17:56:49 +1100308 (ip->i_size >= XFS_FSB_TO_B(mp, mp->m_swidth)))
Nathan Scottdd9f4382006-01-11 15:28:28 +1100309 new_last_fsb = roundup_64(*last_fsb, mp->m_swidth);
310 /*
311 * Roundup the allocation request to a stripe unit (m_dalign) boundary
312 * if the file size is >= stripe unit size, and we are allocating past
313 * the allocation eof.
314 */
Lachlan McIlroy9f6c92b2008-12-22 17:56:49 +1100315 else if (mp->m_dalign && (ip->i_size >= XFS_FSB_TO_B(mp, mp->m_dalign)))
Nathan Scottdd9f4382006-01-11 15:28:28 +1100316 new_last_fsb = roundup_64(*last_fsb, mp->m_dalign);
317
318 /*
319 * Always round up the allocation request to an extent boundary
320 * (when file on a real-time subvolume or has di_extsize hint).
321 */
322 if (extsize) {
323 if (new_last_fsb)
324 align = roundup_64(new_last_fsb, extsize);
325 else
326 align = extsize;
327 new_last_fsb = roundup_64(*last_fsb, align);
328 }
329
330 if (new_last_fsb) {
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000331 error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof);
Nathan Scottdd9f4382006-01-11 15:28:28 +1100332 if (error)
333 return error;
334 if (eof)
335 *last_fsb = new_last_fsb;
336 }
337 return 0;
338}
339
340STATIC int
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341xfs_flush_space(
342 xfs_inode_t *ip,
343 int *fsynced,
344 int *ioflags)
345{
346 switch (*fsynced) {
347 case 0:
348 if (ip->i_delayed_blks) {
349 xfs_iunlock(ip, XFS_ILOCK_EXCL);
350 xfs_flush_inode(ip);
351 xfs_ilock(ip, XFS_ILOCK_EXCL);
352 *fsynced = 1;
353 } else {
354 *ioflags |= BMAPI_SYNC;
355 *fsynced = 2;
356 }
357 return 0;
358 case 1:
359 *fsynced = 2;
360 *ioflags |= BMAPI_SYNC;
361 return 0;
362 case 2:
363 xfs_iunlock(ip, XFS_ILOCK_EXCL);
364 xfs_flush_device(ip);
365 xfs_ilock(ip, XFS_ILOCK_EXCL);
366 *fsynced = 3;
367 return 0;
368 }
369 return 1;
370}
371
Nathan Scott572d95f2006-09-28 11:03:20 +1000372STATIC int
373xfs_cmn_err_fsblock_zero(
374 xfs_inode_t *ip,
375 xfs_bmbt_irec_t *imap)
376{
377 xfs_cmn_err(XFS_PTAG_FSBLOCK_ZERO, CE_ALERT, ip->i_mount,
378 "Access to block zero in inode %llu "
379 "start_block: %llx start_off: %llx "
380 "blkcnt: %llx extent-state: %x\n",
381 (unsigned long long)ip->i_ino,
382 (unsigned long long)imap->br_startblock,
383 (unsigned long long)imap->br_startoff,
384 (unsigned long long)imap->br_blockcount,
385 imap->br_state);
386 return EFSCORRUPTED;
387}
388
Linus Torvalds1da177e2005-04-16 15:20:36 -0700389int
390xfs_iomap_write_direct(
391 xfs_inode_t *ip,
Nathan Scottf403b7f2005-05-05 13:33:40 -0700392 xfs_off_t offset,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 size_t count,
394 int flags,
395 xfs_bmbt_irec_t *ret_imap,
396 int *nmaps,
397 int found)
398{
399 xfs_mount_t *mp = ip->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400 xfs_fileoff_t offset_fsb;
401 xfs_fileoff_t last_fsb;
Nathan Scottdd9f4382006-01-11 15:28:28 +1100402 xfs_filblks_t count_fsb, resaligned;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403 xfs_fsblock_t firstfsb;
Nathan Scottdd9f4382006-01-11 15:28:28 +1100404 xfs_extlen_t extsz, temp;
Eric Sandeen0116d932005-11-02 15:00:01 +1100405 int nimaps;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406 int bmapi_flag;
Nathan Scott06d10dd2005-06-21 15:48:47 +1000407 int quota_flag;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 int rt;
409 xfs_trans_t *tp;
Eric Sandeen0116d932005-11-02 15:00:01 +1100410 xfs_bmbt_irec_t imap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 xfs_bmap_free_t free_list;
Nathan Scottdd9f4382006-01-11 15:28:28 +1100412 uint qblocks, resblks, resrtextents;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 int committed;
Nathan Scottdd9f4382006-01-11 15:28:28 +1100414 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415
416 /*
417 * Make sure that the dquots are there. This doesn't hold
418 * the ilock across a disk read.
419 */
420 error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED);
421 if (error)
422 return XFS_ERROR(error);
423
Nathan Scottdd9f4382006-01-11 15:28:28 +1100424 rt = XFS_IS_REALTIME_INODE(ip);
David Chinner957d0eb2007-06-18 16:50:37 +1000425 extsz = xfs_get_extsz_hint(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
David Chinner957d0eb2007-06-18 16:50:37 +1000427 offset_fsb = XFS_B_TO_FSBT(mp, offset);
428 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
Lachlan McIlroy9f6c92b2008-12-22 17:56:49 +1100429 if ((offset + count) > ip->i_size) {
430 error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb);
Nathan Scottdd9f4382006-01-11 15:28:28 +1100431 if (error)
432 goto error_out;
433 } else {
434 if (found && (ret_imap->br_startblock == HOLESTARTBLOCK))
435 last_fsb = MIN(last_fsb, (xfs_fileoff_t)
436 ret_imap->br_blockcount +
437 ret_imap->br_startoff);
438 }
439 count_fsb = last_fsb - offset_fsb;
440 ASSERT(count_fsb > 0);
441
442 resaligned = count_fsb;
443 if (unlikely(extsz)) {
444 if ((temp = do_mod(offset_fsb, extsz)))
445 resaligned += temp;
446 if ((temp = do_mod(resaligned, extsz)))
447 resaligned += extsz - temp;
448 }
449
450 if (unlikely(rt)) {
451 resrtextents = qblocks = resaligned;
452 resrtextents /= mp->m_sb.sb_rextsize;
David Chinner84e1e992007-06-18 16:50:27 +1000453 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
454 quota_flag = XFS_QMOPT_RES_RTBLKS;
455 } else {
456 resrtextents = 0;
Nathan Scottdd9f4382006-01-11 15:28:28 +1100457 resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
David Chinner84e1e992007-06-18 16:50:27 +1000458 quota_flag = XFS_QMOPT_RES_REGBLKS;
459 }
Nathan Scottdd9f4382006-01-11 15:28:28 +1100460
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461 /*
Nathan Scott06d10dd2005-06-21 15:48:47 +1000462 * Allocate and setup the transaction
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 */
464 xfs_iunlock(ip, XFS_ILOCK_EXCL);
465 tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 error = xfs_trans_reserve(tp, resblks,
Nathan Scottd52b44d2005-09-02 16:41:32 +1000467 XFS_WRITE_LOG_RES(mp), resrtextents,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700468 XFS_TRANS_PERM_LOG_RES,
469 XFS_WRITE_LOG_COUNT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 /*
Nathan Scott06d10dd2005-06-21 15:48:47 +1000471 * Check for running out of space, note: need lock to return
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 */
473 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474 xfs_trans_cancel(tp, 0);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700475 xfs_ilock(ip, XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 if (error)
Nathan Scott06d10dd2005-06-21 15:48:47 +1000477 goto error_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478
Nathan Scottdd9f4382006-01-11 15:28:28 +1100479 error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip,
480 qblocks, 0, quota_flag);
481 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 goto error1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
485 xfs_trans_ihold(tp, ip);
486
Nathan Scottdd9f4382006-01-11 15:28:28 +1100487 bmapi_flag = XFS_BMAPI_WRITE;
Lachlan McIlroyba87ea62007-05-08 13:49:46 +1000488 if ((flags & BMAPI_DIRECT) && (offset < ip->i_size || extsz))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 bmapi_flag |= XFS_BMAPI_PREALLOC;
490
491 /*
Nathan Scottdd9f4382006-01-11 15:28:28 +1100492 * Issue the xfs_bmapi() call to allocate the blocks
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493 */
Eric Sandeenb6e32222009-01-14 23:22:07 -0600494 xfs_bmap_init(&free_list, &firstfsb);
Nathan Scott06d10dd2005-06-21 15:48:47 +1000495 nimaps = 1;
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000496 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, bmapi_flag,
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000497 &firstfsb, 0, &imap, &nimaps, &free_list, NULL);
Nathan Scott06d10dd2005-06-21 15:48:47 +1000498 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499 goto error0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700500
501 /*
Nathan Scott06d10dd2005-06-21 15:48:47 +1000502 * Complete the transaction
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503 */
Eric Sandeenf7c99b62007-02-10 18:37:16 +1100504 error = xfs_bmap_finish(&tp, &free_list, &committed);
Nathan Scott06d10dd2005-06-21 15:48:47 +1000505 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 goto error0;
Eric Sandeen1c72bf92007-05-08 13:48:42 +1000507 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Nathan Scott06d10dd2005-06-21 15:48:47 +1000508 if (error)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700509 goto error_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
Nathan Scott06d10dd2005-06-21 15:48:47 +1000511 /*
512 * Copy any maps to caller's array and return any error.
513 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 if (nimaps == 0) {
Nathan Scott572d95f2006-09-28 11:03:20 +1000515 error = ENOSPC;
516 goto error_out;
517 }
518
David Chinner86c4d622008-04-29 12:53:21 +1000519 if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip))) {
Nathan Scott572d95f2006-09-28 11:03:20 +1000520 error = xfs_cmn_err_fsblock_zero(ip, &imap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700521 goto error_out;
522 }
523
Eric Sandeen0116d932005-11-02 15:00:01 +1100524 *ret_imap = imap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 *nmaps = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 return 0;
527
Nathan Scott06d10dd2005-06-21 15:48:47 +1000528error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529 xfs_bmap_cancel(&free_list);
Nathan Scott06d10dd2005-06-21 15:48:47 +1000530 XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
Nathan Scott06d10dd2005-06-21 15:48:47 +1000532error1: /* Just cancel transaction */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
534 *nmaps = 0; /* nothing set-up here */
535
536error_out:
537 return XFS_ERROR(error);
538}
539
Nathan Scottdd9f4382006-01-11 15:28:28 +1100540/*
541 * If the caller is doing a write at the end of the file,
542 * then extend the allocation out to the file system's write
543 * iosize. We clean up any extra space left over when the
544 * file is closed in xfs_inactive().
545 *
546 * For sync writes, we are flushing delayed allocate space to
547 * try to make additional space available for allocation near
548 * the filesystem full boundary - preallocation hurts in that
549 * situation, of course.
550 */
551STATIC int
552xfs_iomap_eof_want_preallocate(
553 xfs_mount_t *mp,
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000554 xfs_inode_t *ip,
Nathan Scottdd9f4382006-01-11 15:28:28 +1100555 xfs_off_t offset,
556 size_t count,
557 int ioflag,
558 xfs_bmbt_irec_t *imap,
559 int nimaps,
560 int *prealloc)
561{
562 xfs_fileoff_t start_fsb;
563 xfs_filblks_t count_fsb;
564 xfs_fsblock_t firstblock;
565 int n, error, imaps;
566
567 *prealloc = 0;
Lachlan McIlroy9f6c92b2008-12-22 17:56:49 +1100568 if ((ioflag & BMAPI_SYNC) || (offset + count) <= ip->i_size)
Nathan Scottdd9f4382006-01-11 15:28:28 +1100569 return 0;
570
571 /*
572 * If there are any real blocks past eof, then don't
573 * do any speculative allocation.
574 */
575 start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1)));
576 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp));
577 while (count_fsb > 0) {
578 imaps = nimaps;
Nathan Scott3ddb8fa2006-01-11 15:33:02 +1100579 firstblock = NULLFSBLOCK;
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000580 error = xfs_bmapi(NULL, ip, start_fsb, count_fsb, 0,
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000581 &firstblock, 0, imap, &imaps, NULL, NULL);
Nathan Scottdd9f4382006-01-11 15:28:28 +1100582 if (error)
583 return error;
584 for (n = 0; n < imaps; n++) {
585 if ((imap[n].br_startblock != HOLESTARTBLOCK) &&
586 (imap[n].br_startblock != DELAYSTARTBLOCK))
587 return 0;
588 start_fsb += imap[n].br_blockcount;
589 count_fsb -= imap[n].br_blockcount;
590 }
591 }
592 *prealloc = 1;
593 return 0;
594}
595
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596int
597xfs_iomap_write_delay(
598 xfs_inode_t *ip,
Nathan Scottf403b7f2005-05-05 13:33:40 -0700599 xfs_off_t offset,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600 size_t count,
601 int ioflag,
602 xfs_bmbt_irec_t *ret_imap,
603 int *nmaps)
604{
605 xfs_mount_t *mp = ip->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 xfs_fileoff_t offset_fsb;
607 xfs_fileoff_t last_fsb;
Nathan Scottdd9f4382006-01-11 15:28:28 +1100608 xfs_off_t aligned_offset;
609 xfs_fileoff_t ioalign;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700610 xfs_fsblock_t firstblock;
Nathan Scottdd9f4382006-01-11 15:28:28 +1100611 xfs_extlen_t extsz;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 int nimaps;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613 xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS];
Nathan Scottdd9f4382006-01-11 15:28:28 +1100614 int prealloc, fsynced = 0;
615 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
Christoph Hellwig579aa9c2008-04-22 17:34:00 +1000617 ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
619 /*
620 * Make sure that the dquots are there. This doesn't hold
621 * the ilock across a disk read.
622 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700623 error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED);
624 if (error)
625 return XFS_ERROR(error);
626
David Chinner957d0eb2007-06-18 16:50:37 +1000627 extsz = xfs_get_extsz_hint(ip);
Nathan Scottdd9f4382006-01-11 15:28:28 +1100628 offset_fsb = XFS_B_TO_FSBT(mp, offset);
629
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630retry:
Lachlan McIlroy9f6c92b2008-12-22 17:56:49 +1100631 error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count,
Nathan Scottdd9f4382006-01-11 15:28:28 +1100632 ioflag, imap, XFS_WRITE_IMAPS, &prealloc);
633 if (error)
634 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700635
Nathan Scottdd9f4382006-01-11 15:28:28 +1100636 if (prealloc) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1));
638 ioalign = XFS_B_TO_FSBT(mp, aligned_offset);
Nathan Scottdd9f4382006-01-11 15:28:28 +1100639 last_fsb = ioalign + mp->m_writeio_blocks;
640 } else {
641 last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 }
Nathan Scottdd9f4382006-01-11 15:28:28 +1100643
644 if (prealloc || extsz) {
Lachlan McIlroy9f6c92b2008-12-22 17:56:49 +1100645 error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb);
Nathan Scottdd9f4382006-01-11 15:28:28 +1100646 if (error)
647 return error;
648 }
649
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 nimaps = XFS_WRITE_IMAPS;
651 firstblock = NULLFSBLOCK;
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000652 error = xfs_bmapi(NULL, ip, offset_fsb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700653 (xfs_filblks_t)(last_fsb - offset_fsb),
654 XFS_BMAPI_DELAY | XFS_BMAPI_WRITE |
655 XFS_BMAPI_ENTIRE, &firstblock, 1, imap,
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000656 &nimaps, NULL, NULL);
Nathan Scottdd9f4382006-01-11 15:28:28 +1100657 if (error && (error != ENOSPC))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 return XFS_ERROR(error);
Nathan Scottdd9f4382006-01-11 15:28:28 +1100659
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660 /*
661 * If bmapi returned us nothing, and if we didn't get back EDQUOT,
Nathan Scottdd9f4382006-01-11 15:28:28 +1100662 * then we must have run out of space - flush delalloc, and retry..
Linus Torvalds1da177e2005-04-16 15:20:36 -0700663 */
664 if (nimaps == 0) {
665 xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE,
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000666 ip, offset, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667 if (xfs_flush_space(ip, &fsynced, &ioflag))
668 return XFS_ERROR(ENOSPC);
669
670 error = 0;
671 goto retry;
672 }
673
David Chinner86c4d622008-04-29 12:53:21 +1000674 if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip)))
Nathan Scott572d95f2006-09-28 11:03:20 +1000675 return xfs_cmn_err_fsblock_zero(ip, &imap[0]);
Nathan Scottdd9f4382006-01-11 15:28:28 +1100676
677 *ret_imap = imap[0];
678 *nmaps = 1;
679
Linus Torvalds1da177e2005-04-16 15:20:36 -0700680 return 0;
681}
682
683/*
684 * Pass in a delayed allocate extent, convert it to real extents;
685 * return to the caller the extent we create which maps on top of
686 * the originating callers request.
687 *
688 * Called without a lock on the inode.
David Chinnere4143a12007-11-23 16:29:11 +1100689 *
690 * We no longer bother to look at the incoming map - all we have to
691 * guarantee is that whatever we allocate fills the required range.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 */
693int
694xfs_iomap_write_allocate(
695 xfs_inode_t *ip,
Nathan Scottf403b7f2005-05-05 13:33:40 -0700696 xfs_off_t offset,
Nathan Scott24e17b52005-05-05 13:33:20 -0700697 size_t count,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 xfs_bmbt_irec_t *map,
699 int *retmap)
700{
701 xfs_mount_t *mp = ip->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 xfs_fileoff_t offset_fsb, last_block;
703 xfs_fileoff_t end_fsb, map_start_fsb;
704 xfs_fsblock_t first_block;
705 xfs_bmap_free_t free_list;
706 xfs_filblks_t count_fsb;
David Chinnere4143a12007-11-23 16:29:11 +1100707 xfs_bmbt_irec_t imap;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700708 xfs_trans_t *tp;
David Chinnere4143a12007-11-23 16:29:11 +1100709 int nimaps, committed;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700710 int error = 0;
711 int nres;
712
713 *retmap = 0;
714
715 /*
716 * Make sure that the dquots are there.
717 */
718 if ((error = XFS_QM_DQATTACH(mp, ip, 0)))
719 return XFS_ERROR(error);
720
Nathan Scott24e17b52005-05-05 13:33:20 -0700721 offset_fsb = XFS_B_TO_FSBT(mp, offset);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722 count_fsb = map->br_blockcount;
Nathan Scott24e17b52005-05-05 13:33:20 -0700723 map_start_fsb = map->br_startoff;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724
725 XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb));
726
727 while (count_fsb != 0) {
728 /*
729 * Set up a transaction with which to allocate the
730 * backing store for the file. Do allocations in a
731 * loop until we get some space in the range we are
732 * interested in. The other space that might be allocated
733 * is in the delayed allocation extent on which we sit
734 * but before our buffer starts.
735 */
736
737 nimaps = 0;
738 while (nimaps == 0) {
739 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
David Chinner84e1e992007-06-18 16:50:27 +1000740 tp->t_flags |= XFS_TRANS_RESERVE;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700741 nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK);
742 error = xfs_trans_reserve(tp, nres,
743 XFS_WRITE_LOG_RES(mp),
744 0, XFS_TRANS_PERM_LOG_RES,
745 XFS_WRITE_LOG_COUNT);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700746 if (error) {
747 xfs_trans_cancel(tp, 0);
748 return XFS_ERROR(error);
749 }
750 xfs_ilock(ip, XFS_ILOCK_EXCL);
751 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
752 xfs_trans_ihold(tp, ip);
753
Eric Sandeenb6e32222009-01-14 23:22:07 -0600754 xfs_bmap_init(&free_list, &first_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700755
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 /*
David Chinnere4143a12007-11-23 16:29:11 +1100757 * it is possible that the extents have changed since
758 * we did the read call as we dropped the ilock for a
759 * while. We have to be careful about truncates or hole
760 * punchs here - we are not allowed to allocate
761 * non-delalloc blocks here.
762 *
763 * The only protection against truncation is the pages
764 * for the range we are being asked to convert are
765 * locked and hence a truncate will block on them
766 * first.
767 *
768 * As a result, if we go beyond the range we really
769 * need and hit an delalloc extent boundary followed by
770 * a hole while we have excess blocks in the map, we
771 * will fill the hole incorrectly and overrun the
772 * transaction reservation.
773 *
774 * Using a single map prevents this as we are forced to
775 * check each map we look for overlap with the desired
776 * range and abort as soon as we find it. Also, given
777 * that we only return a single map, having one beyond
778 * what we can return is probably a bit silly.
779 *
780 * We also need to check that we don't go beyond EOF;
781 * this is a truncate optimisation as a truncate sets
782 * the new file size before block on the pages we
783 * currently have locked under writeback. Because they
784 * are about to be tossed, we don't need to write them
785 * back....
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 */
David Chinnere4143a12007-11-23 16:29:11 +1100787 nimaps = 1;
Lachlan McIlroyba87ea62007-05-08 13:49:46 +1000788 end_fsb = XFS_B_TO_FSB(mp, ip->i_size);
David Chinner7c9ef852008-04-10 12:21:59 +1000789 error = xfs_bmap_last_offset(NULL, ip, &last_block,
790 XFS_DATA_FORK);
791 if (error)
792 goto trans_cancel;
793
Linus Torvalds1da177e2005-04-16 15:20:36 -0700794 last_block = XFS_FILEOFF_MAX(last_block, end_fsb);
795 if ((map_start_fsb + count_fsb) > last_block) {
796 count_fsb = last_block - map_start_fsb;
797 if (count_fsb == 0) {
798 error = EAGAIN;
799 goto trans_cancel;
800 }
801 }
802
803 /* Go get the actual blocks */
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000804 error = xfs_bmapi(tp, ip, map_start_fsb, count_fsb,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 XFS_BMAPI_WRITE, &first_block, 1,
David Chinnere4143a12007-11-23 16:29:11 +1100806 &imap, &nimaps, &free_list, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 if (error)
808 goto trans_cancel;
809
Eric Sandeenf7c99b62007-02-10 18:37:16 +1100810 error = xfs_bmap_finish(&tp, &free_list, &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700811 if (error)
812 goto trans_cancel;
813
Eric Sandeen1c72bf92007-05-08 13:48:42 +1000814 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 if (error)
816 goto error0;
817
818 xfs_iunlock(ip, XFS_ILOCK_EXCL);
819 }
820
821 /*
822 * See if we were able to allocate an extent that
823 * covers at least part of the callers request
824 */
David Chinner86c4d622008-04-29 12:53:21 +1000825 if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip)))
David Chinnere4143a12007-11-23 16:29:11 +1100826 return xfs_cmn_err_fsblock_zero(ip, &imap);
David Chinner86c4d622008-04-29 12:53:21 +1000827
David Chinnere4143a12007-11-23 16:29:11 +1100828 if ((offset_fsb >= imap.br_startoff) &&
829 (offset_fsb < (imap.br_startoff +
830 imap.br_blockcount))) {
831 *map = imap;
832 *retmap = 1;
833 XFS_STATS_INC(xs_xstrat_quick);
834 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700835 }
836
David Chinnere4143a12007-11-23 16:29:11 +1100837 /*
838 * So far we have not mapped the requested part of the
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 * file, just surrounding data, try again.
840 */
David Chinnere4143a12007-11-23 16:29:11 +1100841 count_fsb -= imap.br_blockcount;
842 map_start_fsb = imap.br_startoff + imap.br_blockcount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 }
844
845trans_cancel:
846 xfs_bmap_cancel(&free_list);
847 xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT);
848error0:
849 xfs_iunlock(ip, XFS_ILOCK_EXCL);
850 return XFS_ERROR(error);
851}
852
853int
854xfs_iomap_write_unwritten(
855 xfs_inode_t *ip,
Nathan Scottf403b7f2005-05-05 13:33:40 -0700856 xfs_off_t offset,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857 size_t count)
858{
859 xfs_mount_t *mp = ip->i_mount;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 xfs_fileoff_t offset_fsb;
861 xfs_filblks_t count_fsb;
862 xfs_filblks_t numblks_fsb;
Nathan Scottdd9f4382006-01-11 15:28:28 +1100863 xfs_fsblock_t firstfsb;
864 int nimaps;
865 xfs_trans_t *tp;
866 xfs_bmbt_irec_t imap;
867 xfs_bmap_free_t free_list;
868 uint resblks;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 int committed;
870 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700871
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000872 xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN, ip, offset, count);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700873
874 offset_fsb = XFS_B_TO_FSBT(mp, offset);
875 count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count);
876 count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb);
877
Lachlan McIlroy4ddd8bb2008-06-27 13:32:53 +1000878 /*
879 * Reserve enough blocks in this transaction for two complete extent
880 * btree splits. We may be converting the middle part of an unwritten
881 * extent and in this case we will insert two new extents in the btree
882 * each of which could cause a full split.
883 *
884 * This reservation amount will be used in the first call to
885 * xfs_bmbt_split() to select an AG with enough space to satisfy the
886 * rest of the operation.
887 */
Nathan Scottdd9f4382006-01-11 15:28:28 +1100888 resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700889
Nathan Scottdd9f4382006-01-11 15:28:28 +1100890 do {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700891 /*
892 * set up a transaction to convert the range of extents
893 * from unwritten to real. Do allocations in a loop until
894 * we have covered the range passed in.
895 */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700896 tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE);
David Chinner84e1e992007-06-18 16:50:27 +1000897 tp->t_flags |= XFS_TRANS_RESERVE;
Nathan Scottdd9f4382006-01-11 15:28:28 +1100898 error = xfs_trans_reserve(tp, resblks,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700899 XFS_WRITE_LOG_RES(mp), 0,
900 XFS_TRANS_PERM_LOG_RES,
901 XFS_WRITE_LOG_COUNT);
902 if (error) {
903 xfs_trans_cancel(tp, 0);
Nathan Scott572d95f2006-09-28 11:03:20 +1000904 return XFS_ERROR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700905 }
906
907 xfs_ilock(ip, XFS_ILOCK_EXCL);
908 xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL);
909 xfs_trans_ihold(tp, ip);
910
911 /*
912 * Modify the unwritten extent state of the buffer.
913 */
Eric Sandeenb6e32222009-01-14 23:22:07 -0600914 xfs_bmap_init(&free_list, &firstfsb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700915 nimaps = 1;
Lachlan McIlroy541d7d32007-10-11 17:34:33 +1000916 error = xfs_bmapi(tp, ip, offset_fsb, count_fsb,
Nathan Scottdd9f4382006-01-11 15:28:28 +1100917 XFS_BMAPI_WRITE|XFS_BMAPI_CONVERT, &firstfsb,
Olaf Weber3e57ecf2006-06-09 14:48:12 +1000918 1, &imap, &nimaps, &free_list, NULL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700919 if (error)
920 goto error_on_bmapi_transaction;
921
Eric Sandeenf7c99b62007-02-10 18:37:16 +1100922 error = xfs_bmap_finish(&(tp), &(free_list), &committed);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700923 if (error)
924 goto error_on_bmapi_transaction;
925
Eric Sandeen1c72bf92007-05-08 13:48:42 +1000926 error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700927 xfs_iunlock(ip, XFS_ILOCK_EXCL);
928 if (error)
Nathan Scott572d95f2006-09-28 11:03:20 +1000929 return XFS_ERROR(error);
Nathan Scottdd9f4382006-01-11 15:28:28 +1100930
David Chinner86c4d622008-04-29 12:53:21 +1000931 if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip)))
Nathan Scott572d95f2006-09-28 11:03:20 +1000932 return xfs_cmn_err_fsblock_zero(ip, &imap);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700933
934 if ((numblks_fsb = imap.br_blockcount) == 0) {
935 /*
936 * The numblks_fsb value should always get
937 * smaller, otherwise the loop is stuck.
938 */
939 ASSERT(imap.br_blockcount);
940 break;
941 }
942 offset_fsb += numblks_fsb;
943 count_fsb -= numblks_fsb;
944 } while (count_fsb > 0);
945
946 return 0;
947
948error_on_bmapi_transaction:
949 xfs_bmap_cancel(&free_list);
950 xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT));
951 xfs_iunlock(ip, XFS_ILOCK_EXCL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700952 return XFS_ERROR(error);
953}