Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Olaf Weber | 3e57ecf | 2006-06-09 14:48:12 +1000 | [diff] [blame] | 2 | * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 3 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
| 8 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 9 | * This program is distributed in the hope that it would be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write the Free Software Foundation, |
| 16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include "xfs.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include "xfs_fs.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 20 | #include "xfs_bit.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 21 | #include "xfs_log.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 22 | #include "xfs_inum.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include "xfs_trans.h" |
| 24 | #include "xfs_sb.h" |
| 25 | #include "xfs_ag.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include "xfs_alloc.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include "xfs_quota.h" |
| 28 | #include "xfs_mount.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include "xfs_bmap_btree.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 30 | #include "xfs_alloc_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 31 | #include "xfs_ialloc_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include "xfs_dinode.h" |
| 33 | #include "xfs_inode.h" |
Nathan Scott | a844f45 | 2005-11-02 14:38:42 +1100 | [diff] [blame] | 34 | #include "xfs_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include "xfs_bmap.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | #include "xfs_rtalloc.h" |
| 37 | #include "xfs_error.h" |
| 38 | #include "xfs_itable.h" |
| 39 | #include "xfs_rw.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | #include "xfs_attr.h" |
| 41 | #include "xfs_buf_item.h" |
| 42 | #include "xfs_trans_space.h" |
| 43 | #include "xfs_utils.h" |
| 44 | #include "xfs_iomap.h" |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 45 | #include "xfs_trace.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
| 48 | #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \ |
| 49 | << mp->m_writeio_log) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | #define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP |
| 51 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | STATIC int |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 53 | xfs_iomap_eof_align_last_fsb( |
| 54 | xfs_mount_t *mp, |
Lachlan McIlroy | 541d7d3 | 2007-10-11 17:34:33 +1000 | [diff] [blame] | 55 | xfs_inode_t *ip, |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 56 | xfs_extlen_t extsize, |
| 57 | xfs_fileoff_t *last_fsb) |
| 58 | { |
| 59 | xfs_fileoff_t new_last_fsb = 0; |
| 60 | xfs_extlen_t align; |
| 61 | int eof, error; |
| 62 | |
Eric Sandeen | 71ddabb | 2007-11-23 16:29:42 +1100 | [diff] [blame] | 63 | if (XFS_IS_REALTIME_INODE(ip)) |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 64 | ; |
| 65 | /* |
| 66 | * If mounted with the "-o swalloc" option, roundup the allocation |
| 67 | * request to a stripe width boundary if the file size is >= |
| 68 | * stripe width and we are allocating past the allocation eof. |
| 69 | */ |
| 70 | else if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC) && |
Lachlan McIlroy | 9f6c92b | 2008-12-22 17:56:49 +1100 | [diff] [blame] | 71 | (ip->i_size >= XFS_FSB_TO_B(mp, mp->m_swidth))) |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 72 | new_last_fsb = roundup_64(*last_fsb, mp->m_swidth); |
| 73 | /* |
| 74 | * Roundup the allocation request to a stripe unit (m_dalign) boundary |
| 75 | * if the file size is >= stripe unit size, and we are allocating past |
| 76 | * the allocation eof. |
| 77 | */ |
Lachlan McIlroy | 9f6c92b | 2008-12-22 17:56:49 +1100 | [diff] [blame] | 78 | else if (mp->m_dalign && (ip->i_size >= XFS_FSB_TO_B(mp, mp->m_dalign))) |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 79 | new_last_fsb = roundup_64(*last_fsb, mp->m_dalign); |
| 80 | |
| 81 | /* |
| 82 | * Always round up the allocation request to an extent boundary |
| 83 | * (when file on a real-time subvolume or has di_extsize hint). |
| 84 | */ |
| 85 | if (extsize) { |
| 86 | if (new_last_fsb) |
| 87 | align = roundup_64(new_last_fsb, extsize); |
| 88 | else |
| 89 | align = extsize; |
| 90 | new_last_fsb = roundup_64(*last_fsb, align); |
| 91 | } |
| 92 | |
| 93 | if (new_last_fsb) { |
Lachlan McIlroy | 541d7d3 | 2007-10-11 17:34:33 +1000 | [diff] [blame] | 94 | error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 95 | if (error) |
| 96 | return error; |
| 97 | if (eof) |
| 98 | *last_fsb = new_last_fsb; |
| 99 | } |
| 100 | return 0; |
| 101 | } |
| 102 | |
| 103 | STATIC int |
Dave Chinner | 6d4a8ec | 2011-03-07 10:06:35 +1100 | [diff] [blame] | 104 | xfs_alert_fsblock_zero( |
Nathan Scott | 572d95f | 2006-09-28 11:03:20 +1000 | [diff] [blame] | 105 | xfs_inode_t *ip, |
| 106 | xfs_bmbt_irec_t *imap) |
| 107 | { |
Dave Chinner | 6a19d93 | 2011-03-07 10:02:35 +1100 | [diff] [blame] | 108 | xfs_alert_tag(ip->i_mount, XFS_PTAG_FSBLOCK_ZERO, |
Nathan Scott | 572d95f | 2006-09-28 11:03:20 +1000 | [diff] [blame] | 109 | "Access to block zero in inode %llu " |
| 110 | "start_block: %llx start_off: %llx " |
| 111 | "blkcnt: %llx extent-state: %x\n", |
| 112 | (unsigned long long)ip->i_ino, |
| 113 | (unsigned long long)imap->br_startblock, |
| 114 | (unsigned long long)imap->br_startoff, |
| 115 | (unsigned long long)imap->br_blockcount, |
| 116 | imap->br_state); |
| 117 | return EFSCORRUPTED; |
| 118 | } |
| 119 | |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 120 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | xfs_iomap_write_direct( |
| 122 | xfs_inode_t *ip, |
Nathan Scott | f403b7f | 2005-05-05 13:33:40 -0700 | [diff] [blame] | 123 | xfs_off_t offset, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 124 | size_t count, |
Christoph Hellwig | 3070451 | 2010-06-24 11:42:19 +1000 | [diff] [blame] | 125 | xfs_bmbt_irec_t *imap, |
Christoph Hellwig | 405f804 | 2010-12-10 08:42:19 +0000 | [diff] [blame] | 126 | int nmaps) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 127 | { |
| 128 | xfs_mount_t *mp = ip->i_mount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | xfs_fileoff_t offset_fsb; |
| 130 | xfs_fileoff_t last_fsb; |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 131 | xfs_filblks_t count_fsb, resaligned; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | xfs_fsblock_t firstfsb; |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 133 | xfs_extlen_t extsz, temp; |
Eric Sandeen | 0116d93 | 2005-11-02 15:00:01 +1100 | [diff] [blame] | 134 | int nimaps; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 135 | int bmapi_flag; |
Nathan Scott | 06d10dd | 2005-06-21 15:48:47 +1000 | [diff] [blame] | 136 | int quota_flag; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | int rt; |
| 138 | xfs_trans_t *tp; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 139 | xfs_bmap_free_t free_list; |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 140 | uint qblocks, resblks, resrtextents; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 141 | int committed; |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 142 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 143 | |
| 144 | /* |
| 145 | * Make sure that the dquots are there. This doesn't hold |
| 146 | * the ilock across a disk read. |
| 147 | */ |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 148 | error = xfs_qm_dqattach_locked(ip, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | if (error) |
| 150 | return XFS_ERROR(error); |
| 151 | |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 152 | rt = XFS_IS_REALTIME_INODE(ip); |
David Chinner | 957d0eb | 2007-06-18 16:50:37 +1000 | [diff] [blame] | 153 | extsz = xfs_get_extsz_hint(ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | |
David Chinner | 957d0eb | 2007-06-18 16:50:37 +1000 | [diff] [blame] | 155 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
| 156 | last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); |
Lachlan McIlroy | 9f6c92b | 2008-12-22 17:56:49 +1100 | [diff] [blame] | 157 | if ((offset + count) > ip->i_size) { |
| 158 | error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 159 | if (error) |
| 160 | goto error_out; |
| 161 | } else { |
Christoph Hellwig | 405f804 | 2010-12-10 08:42:19 +0000 | [diff] [blame] | 162 | if (nmaps && (imap->br_startblock == HOLESTARTBLOCK)) |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 163 | last_fsb = MIN(last_fsb, (xfs_fileoff_t) |
Christoph Hellwig | 3070451 | 2010-06-24 11:42:19 +1000 | [diff] [blame] | 164 | imap->br_blockcount + |
| 165 | imap->br_startoff); |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 166 | } |
| 167 | count_fsb = last_fsb - offset_fsb; |
| 168 | ASSERT(count_fsb > 0); |
| 169 | |
| 170 | resaligned = count_fsb; |
| 171 | if (unlikely(extsz)) { |
| 172 | if ((temp = do_mod(offset_fsb, extsz))) |
| 173 | resaligned += temp; |
| 174 | if ((temp = do_mod(resaligned, extsz))) |
| 175 | resaligned += extsz - temp; |
| 176 | } |
| 177 | |
| 178 | if (unlikely(rt)) { |
| 179 | resrtextents = qblocks = resaligned; |
| 180 | resrtextents /= mp->m_sb.sb_rextsize; |
David Chinner | 84e1e99 | 2007-06-18 16:50:27 +1000 | [diff] [blame] | 181 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); |
| 182 | quota_flag = XFS_QMOPT_RES_RTBLKS; |
| 183 | } else { |
| 184 | resrtextents = 0; |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 185 | resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned); |
David Chinner | 84e1e99 | 2007-06-18 16:50:27 +1000 | [diff] [blame] | 186 | quota_flag = XFS_QMOPT_RES_REGBLKS; |
| 187 | } |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | /* |
Nathan Scott | 06d10dd | 2005-06-21 15:48:47 +1000 | [diff] [blame] | 190 | * Allocate and setup the transaction |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | */ |
| 192 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 193 | tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | error = xfs_trans_reserve(tp, resblks, |
Nathan Scott | d52b44d | 2005-09-02 16:41:32 +1000 | [diff] [blame] | 195 | XFS_WRITE_LOG_RES(mp), resrtextents, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 196 | XFS_TRANS_PERM_LOG_RES, |
| 197 | XFS_WRITE_LOG_COUNT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 198 | /* |
Nathan Scott | 06d10dd | 2005-06-21 15:48:47 +1000 | [diff] [blame] | 199 | * Check for running out of space, note: need lock to return |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | */ |
| 201 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 202 | xfs_trans_cancel(tp, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 203 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | if (error) |
Nathan Scott | 06d10dd | 2005-06-21 15:48:47 +1000 | [diff] [blame] | 205 | goto error_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 207 | error = xfs_trans_reserve_quota_nblks(tp, ip, qblocks, 0, quota_flag); |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 208 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 209 | goto error1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | |
Christoph Hellwig | ddc3415 | 2011-09-19 15:00:54 +0000 | [diff] [blame^] | 211 | xfs_trans_ijoin(tp, ip, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
Dave Chinner | c0dc782 | 2011-09-18 20:40:52 +0000 | [diff] [blame] | 213 | bmapi_flag = 0; |
Christoph Hellwig | 405f804 | 2010-12-10 08:42:19 +0000 | [diff] [blame] | 214 | if (offset < ip->i_size || extsz) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 215 | bmapi_flag |= XFS_BMAPI_PREALLOC; |
| 216 | |
| 217 | /* |
Christoph Hellwig | 3070451 | 2010-06-24 11:42:19 +1000 | [diff] [blame] | 218 | * From this point onwards we overwrite the imap pointer that the |
| 219 | * caller gave to us. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | */ |
Eric Sandeen | 9d87c31 | 2009-01-14 23:22:07 -0600 | [diff] [blame] | 221 | xfs_bmap_init(&free_list, &firstfsb); |
Nathan Scott | 06d10dd | 2005-06-21 15:48:47 +1000 | [diff] [blame] | 222 | nimaps = 1; |
Dave Chinner | c0dc782 | 2011-09-18 20:40:52 +0000 | [diff] [blame] | 223 | error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, bmapi_flag, |
| 224 | &firstfsb, 0, imap, &nimaps, &free_list); |
Nathan Scott | 06d10dd | 2005-06-21 15:48:47 +1000 | [diff] [blame] | 225 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 226 | goto error0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 227 | |
| 228 | /* |
Nathan Scott | 06d10dd | 2005-06-21 15:48:47 +1000 | [diff] [blame] | 229 | * Complete the transaction |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 230 | */ |
Eric Sandeen | f7c99b6 | 2007-02-10 18:37:16 +1100 | [diff] [blame] | 231 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
Nathan Scott | 06d10dd | 2005-06-21 15:48:47 +1000 | [diff] [blame] | 232 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 233 | goto error0; |
Eric Sandeen | 1c72bf9 | 2007-05-08 13:48:42 +1000 | [diff] [blame] | 234 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
Nathan Scott | 06d10dd | 2005-06-21 15:48:47 +1000 | [diff] [blame] | 235 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 236 | goto error_out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 237 | |
Nathan Scott | 06d10dd | 2005-06-21 15:48:47 +1000 | [diff] [blame] | 238 | /* |
| 239 | * Copy any maps to caller's array and return any error. |
| 240 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 241 | if (nimaps == 0) { |
Nathan Scott | 572d95f | 2006-09-28 11:03:20 +1000 | [diff] [blame] | 242 | error = ENOSPC; |
| 243 | goto error_out; |
| 244 | } |
| 245 | |
Christoph Hellwig | 3070451 | 2010-06-24 11:42:19 +1000 | [diff] [blame] | 246 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) { |
Dave Chinner | 6d4a8ec | 2011-03-07 10:06:35 +1100 | [diff] [blame] | 247 | error = xfs_alert_fsblock_zero(ip, imap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 248 | goto error_out; |
| 249 | } |
| 250 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 251 | return 0; |
| 252 | |
Nathan Scott | 06d10dd | 2005-06-21 15:48:47 +1000 | [diff] [blame] | 253 | error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 254 | xfs_bmap_cancel(&free_list); |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 255 | xfs_trans_unreserve_quota_nblks(tp, ip, qblocks, 0, quota_flag); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 256 | |
Nathan Scott | 06d10dd | 2005-06-21 15:48:47 +1000 | [diff] [blame] | 257 | error1: /* Just cancel transaction */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 258 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | |
| 260 | error_out: |
| 261 | return XFS_ERROR(error); |
| 262 | } |
| 263 | |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 264 | /* |
Dave Chinner | 8de2bf9 | 2009-04-06 18:49:12 +0200 | [diff] [blame] | 265 | * If the caller is doing a write at the end of the file, then extend the |
| 266 | * allocation out to the file system's write iosize. We clean up any extra |
| 267 | * space left over when the file is closed in xfs_inactive(). |
Dave Chinner | 055388a | 2011-01-04 11:35:03 +1100 | [diff] [blame] | 268 | * |
| 269 | * If we find we already have delalloc preallocation beyond EOF, don't do more |
| 270 | * preallocation as it it not needed. |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 271 | */ |
| 272 | STATIC int |
| 273 | xfs_iomap_eof_want_preallocate( |
| 274 | xfs_mount_t *mp, |
Lachlan McIlroy | 541d7d3 | 2007-10-11 17:34:33 +1000 | [diff] [blame] | 275 | xfs_inode_t *ip, |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 276 | xfs_off_t offset, |
| 277 | size_t count, |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 278 | xfs_bmbt_irec_t *imap, |
| 279 | int nimaps, |
| 280 | int *prealloc) |
| 281 | { |
| 282 | xfs_fileoff_t start_fsb; |
| 283 | xfs_filblks_t count_fsb; |
| 284 | xfs_fsblock_t firstblock; |
| 285 | int n, error, imaps; |
Dave Chinner | 055388a | 2011-01-04 11:35:03 +1100 | [diff] [blame] | 286 | int found_delalloc = 0; |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 287 | |
| 288 | *prealloc = 0; |
Dave Chinner | 8de2bf9 | 2009-04-06 18:49:12 +0200 | [diff] [blame] | 289 | if ((offset + count) <= ip->i_size) |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 290 | return 0; |
| 291 | |
| 292 | /* |
| 293 | * If there are any real blocks past eof, then don't |
| 294 | * do any speculative allocation. |
| 295 | */ |
| 296 | start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1))); |
| 297 | count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); |
| 298 | while (count_fsb > 0) { |
| 299 | imaps = nimaps; |
Nathan Scott | 3ddb8fa | 2006-01-11 15:33:02 +1100 | [diff] [blame] | 300 | firstblock = NULLFSBLOCK; |
Dave Chinner | 5c8ed20 | 2011-09-18 20:40:45 +0000 | [diff] [blame] | 301 | error = xfs_bmapi_read(ip, start_fsb, count_fsb, imap, &imaps, |
| 302 | 0); |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 303 | if (error) |
| 304 | return error; |
| 305 | for (n = 0; n < imaps; n++) { |
| 306 | if ((imap[n].br_startblock != HOLESTARTBLOCK) && |
| 307 | (imap[n].br_startblock != DELAYSTARTBLOCK)) |
| 308 | return 0; |
| 309 | start_fsb += imap[n].br_blockcount; |
| 310 | count_fsb -= imap[n].br_blockcount; |
Dave Chinner | 055388a | 2011-01-04 11:35:03 +1100 | [diff] [blame] | 311 | |
| 312 | if (imap[n].br_startblock == DELAYSTARTBLOCK) |
| 313 | found_delalloc = 1; |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 314 | } |
| 315 | } |
Dave Chinner | 055388a | 2011-01-04 11:35:03 +1100 | [diff] [blame] | 316 | if (!found_delalloc) |
| 317 | *prealloc = 1; |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 318 | return 0; |
| 319 | } |
| 320 | |
Dave Chinner | 055388a | 2011-01-04 11:35:03 +1100 | [diff] [blame] | 321 | /* |
| 322 | * If we don't have a user specified preallocation size, dynamically increase |
| 323 | * the preallocation size as the size of the file grows. Cap the maximum size |
| 324 | * at a single extent or less if the filesystem is near full. The closer the |
| 325 | * filesystem is to full, the smaller the maximum prealocation. |
| 326 | */ |
| 327 | STATIC xfs_fsblock_t |
| 328 | xfs_iomap_prealloc_size( |
| 329 | struct xfs_mount *mp, |
| 330 | struct xfs_inode *ip) |
| 331 | { |
| 332 | xfs_fsblock_t alloc_blocks = 0; |
| 333 | |
| 334 | if (!(mp->m_flags & XFS_MOUNT_DFLT_IOSIZE)) { |
| 335 | int shift = 0; |
| 336 | int64_t freesp; |
| 337 | |
Dave Chinner | b8fc8263 | 2011-01-27 12:14:12 +1100 | [diff] [blame] | 338 | /* |
| 339 | * rounddown_pow_of_two() returns an undefined result |
| 340 | * if we pass in alloc_blocks = 0. Hence the "+ 1" to |
| 341 | * ensure we always pass in a non-zero value. |
| 342 | */ |
| 343 | alloc_blocks = XFS_B_TO_FSB(mp, ip->i_size) + 1; |
Dave Chinner | 055388a | 2011-01-04 11:35:03 +1100 | [diff] [blame] | 344 | alloc_blocks = XFS_FILEOFF_MIN(MAXEXTLEN, |
| 345 | rounddown_pow_of_two(alloc_blocks)); |
| 346 | |
| 347 | xfs_icsb_sync_counters(mp, XFS_ICSB_LAZY_COUNT); |
| 348 | freesp = mp->m_sb.sb_fdblocks; |
| 349 | if (freesp < mp->m_low_space[XFS_LOWSP_5_PCNT]) { |
| 350 | shift = 2; |
| 351 | if (freesp < mp->m_low_space[XFS_LOWSP_4_PCNT]) |
| 352 | shift++; |
| 353 | if (freesp < mp->m_low_space[XFS_LOWSP_3_PCNT]) |
| 354 | shift++; |
| 355 | if (freesp < mp->m_low_space[XFS_LOWSP_2_PCNT]) |
| 356 | shift++; |
| 357 | if (freesp < mp->m_low_space[XFS_LOWSP_1_PCNT]) |
| 358 | shift++; |
| 359 | } |
| 360 | if (shift) |
| 361 | alloc_blocks >>= shift; |
| 362 | } |
| 363 | |
| 364 | if (alloc_blocks < mp->m_writeio_blocks) |
| 365 | alloc_blocks = mp->m_writeio_blocks; |
| 366 | |
| 367 | return alloc_blocks; |
| 368 | } |
| 369 | |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 370 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | xfs_iomap_write_delay( |
| 372 | xfs_inode_t *ip, |
Nathan Scott | f403b7f | 2005-05-05 13:33:40 -0700 | [diff] [blame] | 373 | xfs_off_t offset, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | size_t count, |
Christoph Hellwig | 405f804 | 2010-12-10 08:42:19 +0000 | [diff] [blame] | 375 | xfs_bmbt_irec_t *ret_imap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | { |
| 377 | xfs_mount_t *mp = ip->i_mount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 378 | xfs_fileoff_t offset_fsb; |
| 379 | xfs_fileoff_t last_fsb; |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 380 | xfs_off_t aligned_offset; |
| 381 | xfs_fileoff_t ioalign; |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 382 | xfs_extlen_t extsz; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | int nimaps; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; |
Dave Chinner | 8de2bf9 | 2009-04-06 18:49:12 +0200 | [diff] [blame] | 385 | int prealloc, flushed = 0; |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 386 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | |
Christoph Hellwig | 579aa9c | 2008-04-22 17:34:00 +1000 | [diff] [blame] | 388 | ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 389 | |
| 390 | /* |
| 391 | * Make sure that the dquots are there. This doesn't hold |
| 392 | * the ilock across a disk read. |
| 393 | */ |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 394 | error = xfs_qm_dqattach_locked(ip, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | if (error) |
| 396 | return XFS_ERROR(error); |
| 397 | |
David Chinner | 957d0eb | 2007-06-18 16:50:37 +1000 | [diff] [blame] | 398 | extsz = xfs_get_extsz_hint(ip); |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 399 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
| 400 | |
Dave Chinner | 055388a | 2011-01-04 11:35:03 +1100 | [diff] [blame] | 401 | |
Lachlan McIlroy | 9f6c92b | 2008-12-22 17:56:49 +1100 | [diff] [blame] | 402 | error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count, |
Christoph Hellwig | 405f804 | 2010-12-10 08:42:19 +0000 | [diff] [blame] | 403 | imap, XFS_WRITE_IMAPS, &prealloc); |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 404 | if (error) |
| 405 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | |
Dave Chinner | 8de2bf9 | 2009-04-06 18:49:12 +0200 | [diff] [blame] | 407 | retry: |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 408 | if (prealloc) { |
Dave Chinner | 055388a | 2011-01-04 11:35:03 +1100 | [diff] [blame] | 409 | xfs_fsblock_t alloc_blocks = xfs_iomap_prealloc_size(mp, ip); |
| 410 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 411 | aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); |
| 412 | ioalign = XFS_B_TO_FSBT(mp, aligned_offset); |
Dave Chinner | 055388a | 2011-01-04 11:35:03 +1100 | [diff] [blame] | 413 | last_fsb = ioalign + alloc_blocks; |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 414 | } else { |
| 415 | last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 416 | } |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 417 | |
| 418 | if (prealloc || extsz) { |
Lachlan McIlroy | 9f6c92b | 2008-12-22 17:56:49 +1100 | [diff] [blame] | 419 | error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 420 | if (error) |
| 421 | return error; |
| 422 | } |
| 423 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 424 | nimaps = XFS_WRITE_IMAPS; |
Christoph Hellwig | 4403280 | 2011-09-18 20:40:48 +0000 | [diff] [blame] | 425 | error = xfs_bmapi_delay(ip, offset_fsb, last_fsb - offset_fsb, |
| 426 | imap, &nimaps, XFS_BMAPI_ENTIRE); |
Dave Chinner | 055388a | 2011-01-04 11:35:03 +1100 | [diff] [blame] | 427 | switch (error) { |
| 428 | case 0: |
| 429 | case ENOSPC: |
| 430 | case EDQUOT: |
| 431 | break; |
| 432 | default: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 433 | return XFS_ERROR(error); |
Dave Chinner | 055388a | 2011-01-04 11:35:03 +1100 | [diff] [blame] | 434 | } |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 435 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | /* |
Dave Chinner | 055388a | 2011-01-04 11:35:03 +1100 | [diff] [blame] | 437 | * If bmapi returned us nothing, we got either ENOSPC or EDQUOT. For |
| 438 | * ENOSPC, * flush all other inodes with delalloc blocks to free up |
| 439 | * some of the excess reserved metadata space. For both cases, retry |
| 440 | * without EOF preallocation. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | */ |
| 442 | if (nimaps == 0) { |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 443 | trace_xfs_delalloc_enospc(ip, offset, count); |
Dave Chinner | 8de2bf9 | 2009-04-06 18:49:12 +0200 | [diff] [blame] | 444 | if (flushed) |
Dave Chinner | 055388a | 2011-01-04 11:35:03 +1100 | [diff] [blame] | 445 | return XFS_ERROR(error ? error : ENOSPC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
Dave Chinner | 055388a | 2011-01-04 11:35:03 +1100 | [diff] [blame] | 447 | if (error == ENOSPC) { |
| 448 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 449 | xfs_flush_inodes(ip); |
| 450 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
| 451 | } |
Dave Chinner | 8de2bf9 | 2009-04-06 18:49:12 +0200 | [diff] [blame] | 452 | |
| 453 | flushed = 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | error = 0; |
Dave Chinner | 8de2bf9 | 2009-04-06 18:49:12 +0200 | [diff] [blame] | 455 | prealloc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 456 | goto retry; |
| 457 | } |
| 458 | |
David Chinner | 86c4d62 | 2008-04-29 12:53:21 +1000 | [diff] [blame] | 459 | if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip))) |
Dave Chinner | 6d4a8ec | 2011-03-07 10:06:35 +1100 | [diff] [blame] | 460 | return xfs_alert_fsblock_zero(ip, &imap[0]); |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 461 | |
| 462 | *ret_imap = imap[0]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 463 | return 0; |
| 464 | } |
| 465 | |
| 466 | /* |
| 467 | * Pass in a delayed allocate extent, convert it to real extents; |
| 468 | * return to the caller the extent we create which maps on top of |
| 469 | * the originating callers request. |
| 470 | * |
| 471 | * Called without a lock on the inode. |
David Chinner | e4143a1 | 2007-11-23 16:29:11 +1100 | [diff] [blame] | 472 | * |
| 473 | * We no longer bother to look at the incoming map - all we have to |
| 474 | * guarantee is that whatever we allocate fills the required range. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 475 | */ |
Christoph Hellwig | a206c81 | 2010-12-10 08:42:20 +0000 | [diff] [blame] | 476 | int |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | xfs_iomap_write_allocate( |
| 478 | xfs_inode_t *ip, |
Nathan Scott | f403b7f | 2005-05-05 13:33:40 -0700 | [diff] [blame] | 479 | xfs_off_t offset, |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 480 | size_t count, |
Christoph Hellwig | 405f804 | 2010-12-10 08:42:19 +0000 | [diff] [blame] | 481 | xfs_bmbt_irec_t *imap) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 482 | { |
| 483 | xfs_mount_t *mp = ip->i_mount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 484 | xfs_fileoff_t offset_fsb, last_block; |
| 485 | xfs_fileoff_t end_fsb, map_start_fsb; |
| 486 | xfs_fsblock_t first_block; |
| 487 | xfs_bmap_free_t free_list; |
| 488 | xfs_filblks_t count_fsb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | xfs_trans_t *tp; |
David Chinner | e4143a1 | 2007-11-23 16:29:11 +1100 | [diff] [blame] | 490 | int nimaps, committed; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | int error = 0; |
| 492 | int nres; |
| 493 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | /* |
| 495 | * Make sure that the dquots are there. |
| 496 | */ |
Christoph Hellwig | 7d09525 | 2009-06-08 15:33:32 +0200 | [diff] [blame] | 497 | error = xfs_qm_dqattach(ip, 0); |
| 498 | if (error) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 499 | return XFS_ERROR(error); |
| 500 | |
Nathan Scott | 24e17b5 | 2005-05-05 13:33:20 -0700 | [diff] [blame] | 501 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
Christoph Hellwig | 3070451 | 2010-06-24 11:42:19 +1000 | [diff] [blame] | 502 | count_fsb = imap->br_blockcount; |
| 503 | map_start_fsb = imap->br_startoff; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 504 | |
| 505 | XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); |
| 506 | |
| 507 | while (count_fsb != 0) { |
| 508 | /* |
| 509 | * Set up a transaction with which to allocate the |
| 510 | * backing store for the file. Do allocations in a |
| 511 | * loop until we get some space in the range we are |
| 512 | * interested in. The other space that might be allocated |
| 513 | * is in the delayed allocation extent on which we sit |
| 514 | * but before our buffer starts. |
| 515 | */ |
| 516 | |
| 517 | nimaps = 0; |
| 518 | while (nimaps == 0) { |
| 519 | tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); |
David Chinner | 84e1e99 | 2007-06-18 16:50:27 +1000 | [diff] [blame] | 520 | tp->t_flags |= XFS_TRANS_RESERVE; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); |
| 522 | error = xfs_trans_reserve(tp, nres, |
| 523 | XFS_WRITE_LOG_RES(mp), |
| 524 | 0, XFS_TRANS_PERM_LOG_RES, |
| 525 | XFS_WRITE_LOG_COUNT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 526 | if (error) { |
| 527 | xfs_trans_cancel(tp, 0); |
| 528 | return XFS_ERROR(error); |
| 529 | } |
| 530 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
Christoph Hellwig | ddc3415 | 2011-09-19 15:00:54 +0000 | [diff] [blame^] | 531 | xfs_trans_ijoin(tp, ip, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 532 | |
Eric Sandeen | 9d87c31 | 2009-01-14 23:22:07 -0600 | [diff] [blame] | 533 | xfs_bmap_init(&free_list, &first_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 534 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | /* |
David Chinner | e4143a1 | 2007-11-23 16:29:11 +1100 | [diff] [blame] | 536 | * it is possible that the extents have changed since |
| 537 | * we did the read call as we dropped the ilock for a |
| 538 | * while. We have to be careful about truncates or hole |
| 539 | * punchs here - we are not allowed to allocate |
| 540 | * non-delalloc blocks here. |
| 541 | * |
| 542 | * The only protection against truncation is the pages |
| 543 | * for the range we are being asked to convert are |
| 544 | * locked and hence a truncate will block on them |
| 545 | * first. |
| 546 | * |
| 547 | * As a result, if we go beyond the range we really |
| 548 | * need and hit an delalloc extent boundary followed by |
| 549 | * a hole while we have excess blocks in the map, we |
| 550 | * will fill the hole incorrectly and overrun the |
| 551 | * transaction reservation. |
| 552 | * |
| 553 | * Using a single map prevents this as we are forced to |
| 554 | * check each map we look for overlap with the desired |
| 555 | * range and abort as soon as we find it. Also, given |
| 556 | * that we only return a single map, having one beyond |
| 557 | * what we can return is probably a bit silly. |
| 558 | * |
| 559 | * We also need to check that we don't go beyond EOF; |
| 560 | * this is a truncate optimisation as a truncate sets |
| 561 | * the new file size before block on the pages we |
| 562 | * currently have locked under writeback. Because they |
| 563 | * are about to be tossed, we don't need to write them |
| 564 | * back.... |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 565 | */ |
David Chinner | e4143a1 | 2007-11-23 16:29:11 +1100 | [diff] [blame] | 566 | nimaps = 1; |
Lachlan McIlroy | ba87ea6 | 2007-05-08 13:49:46 +1000 | [diff] [blame] | 567 | end_fsb = XFS_B_TO_FSB(mp, ip->i_size); |
David Chinner | 7c9ef85 | 2008-04-10 12:21:59 +1000 | [diff] [blame] | 568 | error = xfs_bmap_last_offset(NULL, ip, &last_block, |
| 569 | XFS_DATA_FORK); |
| 570 | if (error) |
| 571 | goto trans_cancel; |
| 572 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 573 | last_block = XFS_FILEOFF_MAX(last_block, end_fsb); |
| 574 | if ((map_start_fsb + count_fsb) > last_block) { |
| 575 | count_fsb = last_block - map_start_fsb; |
| 576 | if (count_fsb == 0) { |
| 577 | error = EAGAIN; |
| 578 | goto trans_cancel; |
| 579 | } |
| 580 | } |
| 581 | |
Christoph Hellwig | 3070451 | 2010-06-24 11:42:19 +1000 | [diff] [blame] | 582 | /* |
Christoph Hellwig | 3070451 | 2010-06-24 11:42:19 +1000 | [diff] [blame] | 583 | * From this point onwards we overwrite the imap |
| 584 | * pointer that the caller gave to us. |
| 585 | */ |
Dave Chinner | c0dc782 | 2011-09-18 20:40:52 +0000 | [diff] [blame] | 586 | error = xfs_bmapi_write(tp, ip, map_start_fsb, |
| 587 | count_fsb, 0, &first_block, 1, |
| 588 | imap, &nimaps, &free_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 589 | if (error) |
| 590 | goto trans_cancel; |
| 591 | |
Eric Sandeen | f7c99b6 | 2007-02-10 18:37:16 +1100 | [diff] [blame] | 592 | error = xfs_bmap_finish(&tp, &free_list, &committed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 593 | if (error) |
| 594 | goto trans_cancel; |
| 595 | |
Eric Sandeen | 1c72bf9 | 2007-05-08 13:48:42 +1000 | [diff] [blame] | 596 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 597 | if (error) |
| 598 | goto error0; |
| 599 | |
| 600 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 601 | } |
| 602 | |
| 603 | /* |
| 604 | * See if we were able to allocate an extent that |
| 605 | * covers at least part of the callers request |
| 606 | */ |
Christoph Hellwig | 3070451 | 2010-06-24 11:42:19 +1000 | [diff] [blame] | 607 | if (!(imap->br_startblock || XFS_IS_REALTIME_INODE(ip))) |
Dave Chinner | 6d4a8ec | 2011-03-07 10:06:35 +1100 | [diff] [blame] | 608 | return xfs_alert_fsblock_zero(ip, imap); |
David Chinner | 86c4d62 | 2008-04-29 12:53:21 +1000 | [diff] [blame] | 609 | |
Christoph Hellwig | 3070451 | 2010-06-24 11:42:19 +1000 | [diff] [blame] | 610 | if ((offset_fsb >= imap->br_startoff) && |
| 611 | (offset_fsb < (imap->br_startoff + |
| 612 | imap->br_blockcount))) { |
David Chinner | e4143a1 | 2007-11-23 16:29:11 +1100 | [diff] [blame] | 613 | XFS_STATS_INC(xs_xstrat_quick); |
| 614 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | } |
| 616 | |
David Chinner | e4143a1 | 2007-11-23 16:29:11 +1100 | [diff] [blame] | 617 | /* |
| 618 | * So far we have not mapped the requested part of the |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | * file, just surrounding data, try again. |
| 620 | */ |
Christoph Hellwig | 3070451 | 2010-06-24 11:42:19 +1000 | [diff] [blame] | 621 | count_fsb -= imap->br_blockcount; |
| 622 | map_start_fsb = imap->br_startoff + imap->br_blockcount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | } |
| 624 | |
| 625 | trans_cancel: |
| 626 | xfs_bmap_cancel(&free_list); |
| 627 | xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); |
| 628 | error0: |
| 629 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 630 | return XFS_ERROR(error); |
| 631 | } |
| 632 | |
| 633 | int |
| 634 | xfs_iomap_write_unwritten( |
| 635 | xfs_inode_t *ip, |
Nathan Scott | f403b7f | 2005-05-05 13:33:40 -0700 | [diff] [blame] | 636 | xfs_off_t offset, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 637 | size_t count) |
| 638 | { |
| 639 | xfs_mount_t *mp = ip->i_mount; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 640 | xfs_fileoff_t offset_fsb; |
| 641 | xfs_filblks_t count_fsb; |
| 642 | xfs_filblks_t numblks_fsb; |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 643 | xfs_fsblock_t firstfsb; |
| 644 | int nimaps; |
| 645 | xfs_trans_t *tp; |
| 646 | xfs_bmbt_irec_t imap; |
| 647 | xfs_bmap_free_t free_list; |
| 648 | uint resblks; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 649 | int committed; |
| 650 | int error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | |
Christoph Hellwig | 0b1b213 | 2009-12-14 23:14:59 +0000 | [diff] [blame] | 652 | trace_xfs_unwritten_convert(ip, offset, count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 653 | |
| 654 | offset_fsb = XFS_B_TO_FSBT(mp, offset); |
| 655 | count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); |
| 656 | count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); |
| 657 | |
Lachlan McIlroy | 4ddd8bb | 2008-06-27 13:32:53 +1000 | [diff] [blame] | 658 | /* |
| 659 | * Reserve enough blocks in this transaction for two complete extent |
| 660 | * btree splits. We may be converting the middle part of an unwritten |
| 661 | * extent and in this case we will insert two new extents in the btree |
| 662 | * each of which could cause a full split. |
| 663 | * |
| 664 | * This reservation amount will be used in the first call to |
| 665 | * xfs_bmbt_split() to select an AG with enough space to satisfy the |
| 666 | * rest of the operation. |
| 667 | */ |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 668 | resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 670 | do { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 671 | /* |
| 672 | * set up a transaction to convert the range of extents |
| 673 | * from unwritten to real. Do allocations in a loop until |
| 674 | * we have covered the range passed in. |
Christoph Hellwig | 80641dc | 2009-10-19 04:00:03 +0000 | [diff] [blame] | 675 | * |
| 676 | * Note that we open code the transaction allocation here |
| 677 | * to pass KM_NOFS--we can't risk to recursing back into |
| 678 | * the filesystem here as we might be asked to write out |
| 679 | * the same inode that we complete here and might deadlock |
| 680 | * on the iolock. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 681 | */ |
Christoph Hellwig | 80641dc | 2009-10-19 04:00:03 +0000 | [diff] [blame] | 682 | xfs_wait_for_freeze(mp, SB_FREEZE_TRANS); |
| 683 | tp = _xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE, KM_NOFS); |
David Chinner | 84e1e99 | 2007-06-18 16:50:27 +1000 | [diff] [blame] | 684 | tp->t_flags |= XFS_TRANS_RESERVE; |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 685 | error = xfs_trans_reserve(tp, resblks, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 686 | XFS_WRITE_LOG_RES(mp), 0, |
| 687 | XFS_TRANS_PERM_LOG_RES, |
| 688 | XFS_WRITE_LOG_COUNT); |
| 689 | if (error) { |
| 690 | xfs_trans_cancel(tp, 0); |
Nathan Scott | 572d95f | 2006-09-28 11:03:20 +1000 | [diff] [blame] | 691 | return XFS_ERROR(error); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 692 | } |
| 693 | |
| 694 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
Christoph Hellwig | ddc3415 | 2011-09-19 15:00:54 +0000 | [diff] [blame^] | 695 | xfs_trans_ijoin(tp, ip, 0); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 696 | |
| 697 | /* |
| 698 | * Modify the unwritten extent state of the buffer. |
| 699 | */ |
Eric Sandeen | 9d87c31 | 2009-01-14 23:22:07 -0600 | [diff] [blame] | 700 | xfs_bmap_init(&free_list, &firstfsb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 701 | nimaps = 1; |
Dave Chinner | c0dc782 | 2011-09-18 20:40:52 +0000 | [diff] [blame] | 702 | error = xfs_bmapi_write(tp, ip, offset_fsb, count_fsb, |
| 703 | XFS_BMAPI_CONVERT, &firstfsb, |
Christoph Hellwig | b4e9181 | 2010-06-23 18:11:15 +1000 | [diff] [blame] | 704 | 1, &imap, &nimaps, &free_list); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | if (error) |
| 706 | goto error_on_bmapi_transaction; |
| 707 | |
Eric Sandeen | f7c99b6 | 2007-02-10 18:37:16 +1100 | [diff] [blame] | 708 | error = xfs_bmap_finish(&(tp), &(free_list), &committed); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 709 | if (error) |
| 710 | goto error_on_bmapi_transaction; |
| 711 | |
Eric Sandeen | 1c72bf9 | 2007-05-08 13:48:42 +1000 | [diff] [blame] | 712 | error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| 714 | if (error) |
Nathan Scott | 572d95f | 2006-09-28 11:03:20 +1000 | [diff] [blame] | 715 | return XFS_ERROR(error); |
Nathan Scott | dd9f438 | 2006-01-11 15:28:28 +1100 | [diff] [blame] | 716 | |
David Chinner | 86c4d62 | 2008-04-29 12:53:21 +1000 | [diff] [blame] | 717 | if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip))) |
Dave Chinner | 6d4a8ec | 2011-03-07 10:06:35 +1100 | [diff] [blame] | 718 | return xfs_alert_fsblock_zero(ip, &imap); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 719 | |
| 720 | if ((numblks_fsb = imap.br_blockcount) == 0) { |
| 721 | /* |
| 722 | * The numblks_fsb value should always get |
| 723 | * smaller, otherwise the loop is stuck. |
| 724 | */ |
| 725 | ASSERT(imap.br_blockcount); |
| 726 | break; |
| 727 | } |
| 728 | offset_fsb += numblks_fsb; |
| 729 | count_fsb -= numblks_fsb; |
| 730 | } while (count_fsb > 0); |
| 731 | |
| 732 | return 0; |
| 733 | |
| 734 | error_on_bmapi_transaction: |
| 735 | xfs_bmap_cancel(&free_list); |
| 736 | xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT)); |
| 737 | xfs_iunlock(ip, XFS_ILOCK_EXCL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 738 | return XFS_ERROR(error); |
| 739 | } |