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[/] [or1k/] [tags/] [LINUX_2_4_26_OR32/] [linux/] [linux-2.4/] [fs/] [xfs/] [xfs_iomap.c] - Rev 1780
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/* * Copyright (c) 2000-2004 Silicon Graphics, Inc. All Rights Reserved. * * This program is free software; you can redistribute it and/or modify it * under the terms of version 2 of the GNU General Public License as * published by the Free Software Foundation. * * This program is distributed in the hope that it would be useful, but * WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. * * Further, this software is distributed without any warranty that it is * free of the rightful claim of any third person regarding infringement * or the like. Any license provided herein, whether implied or * otherwise, applies only to this software file. Patent licenses, if * any, provided herein do not apply to combinations of this program with * other software, or any other product whatsoever. * * You should have received a copy of the GNU General Public License along * with this program; if not, write the Free Software Foundation, Inc., 59 * Temple Place - Suite 330, Boston MA 02111-1307, USA. * * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, * Mountain View, CA 94043, or: * * http://www.sgi.com * * For further information regarding this notice, see: * * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ */ #include "xfs.h" #include "xfs_fs.h" #include "xfs_inum.h" #include "xfs_log.h" #include "xfs_trans.h" #include "xfs_sb.h" #include "xfs_ag.h" #include "xfs_dir.h" #include "xfs_dir2.h" #include "xfs_alloc.h" #include "xfs_dmapi.h" #include "xfs_quota.h" #include "xfs_mount.h" #include "xfs_alloc_btree.h" #include "xfs_bmap_btree.h" #include "xfs_ialloc_btree.h" #include "xfs_btree.h" #include "xfs_ialloc.h" #include "xfs_attr_sf.h" #include "xfs_dir_sf.h" #include "xfs_dir2_sf.h" #include "xfs_dinode.h" #include "xfs_inode.h" #include "xfs_bmap.h" #include "xfs_bit.h" #include "xfs_rtalloc.h" #include "xfs_error.h" #include "xfs_itable.h" #include "xfs_rw.h" #include "xfs_acl.h" #include "xfs_cap.h" #include "xfs_mac.h" #include "xfs_attr.h" #include "xfs_buf_item.h" #include "xfs_trans_space.h" #include "xfs_utils.h" #include "xfs_iomap.h" #if defined(XFS_RW_TRACE) void xfs_iomap_enter_trace( int tag, xfs_iocore_t *io, xfs_off_t offset, ssize_t count) { xfs_inode_t *ip = XFS_IO_INODE(io); if (!ip->i_rwtrace) return; ktrace_enter(ip->i_rwtrace, (void *)((unsigned long)tag), (void *)ip, (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)), (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)), (void *)((unsigned long)((offset >> 32) & 0xffffffff)), (void *)((unsigned long)(offset & 0xffffffff)), (void *)((unsigned long)count), (void *)((unsigned long)((io->io_new_size >> 32) & 0xffffffff)), (void *)((unsigned long)(io->io_new_size & 0xffffffff)), (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL, (void *)NULL); } void xfs_iomap_map_trace( int tag, xfs_iocore_t *io, xfs_off_t offset, ssize_t count, xfs_iomap_t *iomapp, xfs_bmbt_irec_t *imapp, int flags) { xfs_inode_t *ip = XFS_IO_INODE(io); if (!ip->i_rwtrace) return; ktrace_enter(ip->i_rwtrace, (void *)((unsigned long)tag), (void *)ip, (void *)((unsigned long)((ip->i_d.di_size >> 32) & 0xffffffff)), (void *)((unsigned long)(ip->i_d.di_size & 0xffffffff)), (void *)((unsigned long)((offset >> 32) & 0xffffffff)), (void *)((unsigned long)(offset & 0xffffffff)), (void *)((unsigned long)count), (void *)((unsigned long)flags), (void *)((unsigned long)((iomapp->iomap_offset >> 32) & 0xffffffff)), (void *)((unsigned long)(iomapp->iomap_offset & 0xffffffff)), (void *)((unsigned long)(iomapp->iomap_delta)), (void *)((unsigned long)(iomapp->iomap_bsize)), (void *)((unsigned long)(iomapp->iomap_bn)), (void *)(__psint_t)(imapp->br_startoff), (void *)((unsigned long)(imapp->br_blockcount)), (void *)(__psint_t)(imapp->br_startblock)); } #else #define xfs_iomap_enter_trace(tag, io, offset, count) #define xfs_iomap_map_trace(tag, io, offset, count, iomapp, imapp, flags) #endif #define XFS_WRITEIO_ALIGN(mp,off) (((off) >> mp->m_writeio_log) \ << mp->m_writeio_log) #define XFS_STRAT_WRITE_IMAPS 2 #define XFS_WRITE_IMAPS XFS_BMAP_MAX_NMAP STATIC int xfs_imap_to_bmap( xfs_iocore_t *io, xfs_off_t offset, xfs_bmbt_irec_t *imap, xfs_iomap_t *iomapp, int imaps, /* Number of imap entries */ int iomaps, /* Number of iomap entries */ int flags) { xfs_mount_t *mp; xfs_fsize_t nisize; int pbm; xfs_fsblock_t start_block; mp = io->io_mount; nisize = XFS_SIZE(mp, io); if (io->io_new_size > nisize) nisize = io->io_new_size; for (pbm = 0; imaps && pbm < iomaps; imaps--, iomapp++, imap++, pbm++) { iomapp->iomap_target = io->io_flags & XFS_IOCORE_RT ? mp->m_rtdev_targp : mp->m_ddev_targp; iomapp->iomap_offset = XFS_FSB_TO_B(mp, imap->br_startoff); iomapp->iomap_delta = offset - iomapp->iomap_offset; iomapp->iomap_bsize = XFS_FSB_TO_B(mp, imap->br_blockcount); iomapp->iomap_flags = flags; start_block = imap->br_startblock; if (start_block == HOLESTARTBLOCK) { iomapp->iomap_bn = IOMAP_DADDR_NULL; iomapp->iomap_flags = IOMAP_HOLE; } else if (start_block == DELAYSTARTBLOCK) { iomapp->iomap_bn = IOMAP_DADDR_NULL; iomapp->iomap_flags = IOMAP_DELAY; } else { iomapp->iomap_bn = XFS_FSB_TO_DB_IO(io, start_block); if (ISUNWRITTEN(imap)) iomapp->iomap_flags |= IOMAP_UNWRITTEN; } if ((iomapp->iomap_offset + iomapp->iomap_bsize) >= nisize) { iomapp->iomap_flags |= IOMAP_EOF; } offset += iomapp->iomap_bsize - iomapp->iomap_delta; } return pbm; /* Return the number filled */ } int xfs_iomap( xfs_iocore_t *io, xfs_off_t offset, ssize_t count, int flags, xfs_iomap_t *iomapp, int *niomaps) { xfs_mount_t *mp = io->io_mount; xfs_fileoff_t offset_fsb, end_fsb; int error = 0; int lockmode = 0; xfs_bmbt_irec_t imap; int nimaps = 1; int bmapi_flags = 0; int iomap_flags = 0; if (XFS_FORCED_SHUTDOWN(mp)) return XFS_ERROR(EIO); switch (flags & (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE | BMAPI_UNWRITTEN | BMAPI_DEVICE)) { case BMAPI_READ: xfs_iomap_enter_trace(XFS_IOMAP_READ_ENTER, io, offset, count); lockmode = XFS_LCK_MAP_SHARED(mp, io); bmapi_flags = XFS_BMAPI_ENTIRE; if (flags & BMAPI_IGNSTATE) bmapi_flags |= XFS_BMAPI_IGSTATE; break; case BMAPI_WRITE: xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, io, offset, count); lockmode = XFS_ILOCK_EXCL|XFS_EXTSIZE_WR; bmapi_flags = 0; XFS_ILOCK(mp, io, lockmode); break; case BMAPI_ALLOCATE: xfs_iomap_enter_trace(XFS_IOMAP_ALLOC_ENTER, io, offset, count); lockmode = XFS_ILOCK_SHARED|XFS_EXTSIZE_RD; bmapi_flags = XFS_BMAPI_ENTIRE; /* Attempt non-blocking lock */ if (flags & BMAPI_TRYLOCK) { if (!XFS_ILOCK_NOWAIT(mp, io, lockmode)) return XFS_ERROR(EAGAIN); } else { XFS_ILOCK(mp, io, lockmode); } break; case BMAPI_UNWRITTEN: goto phase2; case BMAPI_DEVICE: lockmode = XFS_LCK_MAP_SHARED(mp, io); iomapp->iomap_target = io->io_flags & XFS_IOCORE_RT ? mp->m_rtdev_targp : mp->m_ddev_targp; error = 0; *niomaps = 1; goto out; default: BUG(); } ASSERT(offset <= mp->m_maxioffset); if ((xfs_fsize_t)offset + count > mp->m_maxioffset) count = mp->m_maxioffset - offset; end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); offset_fsb = XFS_B_TO_FSBT(mp, offset); error = XFS_BMAPI(mp, NULL, io, offset_fsb, (xfs_filblks_t)(end_fsb - offset_fsb), bmapi_flags, NULL, 0, &imap, &nimaps, NULL); if (error) goto out; phase2: switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE|BMAPI_UNWRITTEN)) { case BMAPI_WRITE: /* If we found an extent, return it */ if (nimaps && (imap.br_startblock != HOLESTARTBLOCK)) { xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io, offset, count, iomapp, &imap, flags); break; } if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) { error = XFS_IOMAP_WRITE_DIRECT(mp, io, offset, count, flags, &imap, &nimaps, nimaps); } else { error = XFS_IOMAP_WRITE_DELAY(mp, io, offset, count, flags, &imap, &nimaps); } if (!error) { xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, io, offset, count, iomapp, &imap, flags); } iomap_flags = IOMAP_NEW; break; case BMAPI_ALLOCATE: /* If we found an extent, return it */ XFS_IUNLOCK(mp, io, lockmode); lockmode = 0; if (nimaps && !ISNULLSTARTBLOCK(imap.br_startblock)) { xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, io, offset, count, iomapp, &imap, flags); break; } error = XFS_IOMAP_WRITE_ALLOCATE(mp, io, &imap, &nimaps); break; case BMAPI_UNWRITTEN: lockmode = 0; error = XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count); nimaps = 0; break; } if (nimaps) { *niomaps = xfs_imap_to_bmap(io, offset, &imap, iomapp, nimaps, *niomaps, iomap_flags); } else if (niomaps) { *niomaps = 0; } out: if (lockmode) XFS_IUNLOCK(mp, io, lockmode); return XFS_ERROR(error); } STATIC int xfs_flush_space( xfs_inode_t *ip, int *fsynced, int *ioflags) { switch (*fsynced) { case 0: if (ip->i_delayed_blks) { xfs_iunlock(ip, XFS_ILOCK_EXCL); xfs_flush_inode(ip); xfs_ilock(ip, XFS_ILOCK_EXCL); *fsynced = 1; } else { *ioflags |= BMAPI_SYNC; *fsynced = 2; } return 0; case 1: *fsynced = 2; *ioflags |= BMAPI_SYNC; return 0; case 2: xfs_iunlock(ip, XFS_ILOCK_EXCL); xfs_flush_device(ip); xfs_ilock(ip, XFS_ILOCK_EXCL); *fsynced = 3; return 0; } return 1; } int xfs_iomap_write_direct( xfs_inode_t *ip, loff_t offset, size_t count, int flags, xfs_bmbt_irec_t *ret_imap, int *nmaps, int found) { xfs_mount_t *mp = ip->i_mount; xfs_iocore_t *io = &ip->i_iocore; xfs_fileoff_t offset_fsb; xfs_fileoff_t last_fsb; xfs_filblks_t count_fsb; xfs_fsize_t isize; xfs_fsblock_t firstfsb; int nimaps, maps; int error; int bmapi_flag; int rt; xfs_trans_t *tp; xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS], *imapp; xfs_bmap_free_t free_list; int aeof; xfs_filblks_t datablocks; int committed; int numrtextents; uint resblks; /* * Make sure that the dquots are there. This doesn't hold * the ilock across a disk read. */ error = XFS_QM_DQATTACH(ip->i_mount, ip, XFS_QMOPT_ILOCKED); if (error) return XFS_ERROR(error); maps = min(XFS_WRITE_IMAPS, *nmaps); nimaps = maps; isize = ip->i_d.di_size; aeof = (offset + count) > isize; if (io->io_new_size > isize) isize = io->io_new_size; offset_fsb = XFS_B_TO_FSBT(mp, offset); last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); count_fsb = last_fsb - offset_fsb; if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) { xfs_fileoff_t map_last_fsb; map_last_fsb = ret_imap->br_blockcount + ret_imap->br_startoff; if (map_last_fsb < last_fsb) { last_fsb = map_last_fsb; count_fsb = last_fsb - offset_fsb; } ASSERT(count_fsb > 0); } /* * determine if reserving space on * the data or realtime partition. */ if ((rt = XFS_IS_REALTIME_INODE(ip))) { int sbrtextsize, iprtextsize; sbrtextsize = mp->m_sb.sb_rextsize; iprtextsize = ip->i_d.di_extsize ? ip->i_d.di_extsize : sbrtextsize; numrtextents = (count_fsb + iprtextsize - 1); do_div(numrtextents, sbrtextsize); datablocks = 0; } else { datablocks = count_fsb; numrtextents = 0; } /* * allocate and setup the transaction */ xfs_iunlock(ip, XFS_ILOCK_EXCL); tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); resblks = XFS_DIOSTRAT_SPACE_RES(mp, datablocks); error = xfs_trans_reserve(tp, resblks, XFS_WRITE_LOG_RES(mp), numrtextents, XFS_TRANS_PERM_LOG_RES, XFS_WRITE_LOG_COUNT); /* * check for running out of space */ if (error) /* * Free the transaction structure. */ xfs_trans_cancel(tp, 0); xfs_ilock(ip, XFS_ILOCK_EXCL); if (error) goto error_out; /* Don't return in above if .. trans .., need lock to return */ if (XFS_TRANS_RESERVE_BLKQUOTA(mp, tp, ip, resblks)) { error = (EDQUOT); goto error1; } nimaps = 1; bmapi_flag = XFS_BMAPI_WRITE; xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); xfs_trans_ihold(tp, ip); if (!(flags & BMAPI_MMAP) && (offset < ip->i_d.di_size || rt)) bmapi_flag |= XFS_BMAPI_PREALLOC; /* * issue the bmapi() call to allocate the blocks */ XFS_BMAP_INIT(&free_list, &firstfsb); imapp = &imap[0]; error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, bmapi_flag, &firstfsb, 0, imapp, &nimaps, &free_list); if (error) { goto error0; } /* * complete the transaction */ error = xfs_bmap_finish(&tp, &free_list, firstfsb, &committed); if (error) { goto error0; } error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); if (error) { goto error_out; } /* copy any maps to caller's array and return any error. */ if (nimaps == 0) { error = (ENOSPC); goto error_out; } *ret_imap = imap[0]; *nmaps = 1; return 0; error0: /* Cancel bmap, unlock inode, and cancel trans */ xfs_bmap_cancel(&free_list); error1: /* Just cancel transaction */ xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); *nmaps = 0; /* nothing set-up here */ error_out: return XFS_ERROR(error); } int xfs_iomap_write_delay( xfs_inode_t *ip, loff_t offset, size_t count, int ioflag, xfs_bmbt_irec_t *ret_imap, int *nmaps) { xfs_mount_t *mp = ip->i_mount; xfs_iocore_t *io = &ip->i_iocore; xfs_fileoff_t offset_fsb; xfs_fileoff_t last_fsb; xfs_fsize_t isize; xfs_fsblock_t firstblock; int nimaps; int error; xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; int aeof; int fsynced = 0; ASSERT(ismrlocked(&ip->i_lock, MR_UPDATE) != 0); /* * Make sure that the dquots are there. This doesn't hold * the ilock across a disk read. */ error = XFS_QM_DQATTACH(mp, ip, XFS_QMOPT_ILOCKED); if (error) return XFS_ERROR(error); retry: isize = ip->i_d.di_size; if (io->io_new_size > isize) { isize = io->io_new_size; } aeof = 0; offset_fsb = XFS_B_TO_FSBT(mp, offset); last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); /* * If the caller is doing a write at the end of the file, * then extend the allocation (and the buffer used for the write) * out to the file system's write iosize. We clean up any extra * space left over when the file is closed in xfs_inactive(). * * We don't bother with this for sync writes, because we need * to minimize the amount we write for good performance. */ if (!(ioflag & BMAPI_SYNC) && ((offset + count) > ip->i_d.di_size)) { xfs_off_t aligned_offset; unsigned int iosize; xfs_fileoff_t ioalign; iosize = mp->m_writeio_blocks; aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); ioalign = XFS_B_TO_FSBT(mp, aligned_offset); last_fsb = ioalign + iosize; aeof = 1; } nimaps = XFS_WRITE_IMAPS; firstblock = NULLFSBLOCK; /* * roundup the allocation request to m_dalign boundary if file size * is greater that 512K and we are allocating past the allocation eof */ if (mp->m_dalign && (isize >= mp->m_dalign) && aeof) { int eof; xfs_fileoff_t new_last_fsb; new_last_fsb = roundup_64(last_fsb, mp->m_dalign); error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); if (error) { return error; } if (eof) { last_fsb = new_last_fsb; } } error = xfs_bmapi(NULL, ip, offset_fsb, (xfs_filblks_t)(last_fsb - offset_fsb), XFS_BMAPI_DELAY | XFS_BMAPI_WRITE | XFS_BMAPI_ENTIRE, &firstblock, 1, imap, &nimaps, NULL); /* * This can be EDQUOT, if nimaps == 0 */ if (error && (error != ENOSPC)) { return XFS_ERROR(error); } /* * If bmapi returned us nothing, and if we didn't get back EDQUOT, * then we must have run out of space. */ if (nimaps == 0) { xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE, io, offset, count); if (xfs_flush_space(ip, &fsynced, &ioflag)) return XFS_ERROR(ENOSPC); error = 0; goto retry; } *ret_imap = imap[0]; *nmaps = 1; return 0; } /* * Pass in a delayed allocate extent, convert it to real extents; * return to the caller the extent we create which maps on top of * the originating callers request. * * Called without a lock on the inode. */ int xfs_iomap_write_allocate( xfs_inode_t *ip, xfs_bmbt_irec_t *map, int *retmap) { xfs_mount_t *mp = ip->i_mount; xfs_fileoff_t offset_fsb, last_block; xfs_fileoff_t end_fsb, map_start_fsb; xfs_fsblock_t first_block; xfs_bmap_free_t free_list; xfs_filblks_t count_fsb; xfs_bmbt_irec_t imap[XFS_STRAT_WRITE_IMAPS]; xfs_trans_t *tp; int i, nimaps, committed; int error = 0; int nres; *retmap = 0; /* * Make sure that the dquots are there. */ if ((error = XFS_QM_DQATTACH(mp, ip, 0))) return XFS_ERROR(error); offset_fsb = map->br_startoff; count_fsb = map->br_blockcount; map_start_fsb = offset_fsb; XFS_STATS_ADD(xs_xstrat_bytes, XFS_FSB_TO_B(mp, count_fsb)); while (count_fsb != 0) { /* * Set up a transaction with which to allocate the * backing store for the file. Do allocations in a * loop until we get some space in the range we are * interested in. The other space that might be allocated * is in the delayed allocation extent on which we sit * but before our buffer starts. */ nimaps = 0; while (nimaps == 0) { tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); nres = XFS_EXTENTADD_SPACE_RES(mp, XFS_DATA_FORK); error = xfs_trans_reserve(tp, nres, XFS_WRITE_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_WRITE_LOG_COUNT); if (error == ENOSPC) { error = xfs_trans_reserve(tp, 0, XFS_WRITE_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_WRITE_LOG_COUNT); } if (error) { xfs_trans_cancel(tp, 0); return XFS_ERROR(error); } xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); xfs_trans_ihold(tp, ip); XFS_BMAP_INIT(&free_list, &first_block); nimaps = XFS_STRAT_WRITE_IMAPS; /* * Ensure we don't go beyond eof - it is possible * the extents changed since we did the read call, * we dropped the ilock in the interim. */ end_fsb = XFS_B_TO_FSB(mp, ip->i_d.di_size); xfs_bmap_last_offset(NULL, ip, &last_block, XFS_DATA_FORK); last_block = XFS_FILEOFF_MAX(last_block, end_fsb); if ((map_start_fsb + count_fsb) > last_block) { count_fsb = last_block - map_start_fsb; if (count_fsb == 0) { error = EAGAIN; goto trans_cancel; } } /* Go get the actual blocks */ error = xfs_bmapi(tp, ip, map_start_fsb, count_fsb, XFS_BMAPI_WRITE, &first_block, 1, imap, &nimaps, &free_list); if (error) goto trans_cancel; error = xfs_bmap_finish(&tp, &free_list, first_block, &committed); if (error) goto trans_cancel; error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); if (error) goto error0; xfs_iunlock(ip, XFS_ILOCK_EXCL); } /* * See if we were able to allocate an extent that * covers at least part of the callers request */ for (i = 0; i < nimaps; i++) { if ((map->br_startoff >= imap[i].br_startoff) && (map->br_startoff < (imap[i].br_startoff + imap[i].br_blockcount))) { *map = imap[i]; *retmap = 1; XFS_STATS_INC(xs_xstrat_quick); return 0; } count_fsb -= imap[i].br_blockcount; } /* So far we have not mapped the requested part of the * file, just surrounding data, try again. */ nimaps--; offset_fsb = imap[nimaps].br_startoff + imap[nimaps].br_blockcount; map_start_fsb = offset_fsb; } trans_cancel: xfs_bmap_cancel(&free_list); xfs_trans_cancel(tp, XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT); error0: xfs_iunlock(ip, XFS_ILOCK_EXCL); return XFS_ERROR(error); } int xfs_iomap_write_unwritten( xfs_inode_t *ip, loff_t offset, size_t count) { xfs_mount_t *mp = ip->i_mount; xfs_trans_t *tp; xfs_fileoff_t offset_fsb; xfs_filblks_t count_fsb; xfs_filblks_t numblks_fsb; xfs_bmbt_irec_t imap; int committed; int error; int nres; int nimaps; xfs_fsblock_t firstfsb; xfs_bmap_free_t free_list; xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN, &ip->i_iocore, offset, count); offset_fsb = XFS_B_TO_FSBT(mp, offset); count_fsb = XFS_B_TO_FSB(mp, count); do { nres = XFS_DIOSTRAT_SPACE_RES(mp, 0); /* * set up a transaction to convert the range of extents * from unwritten to real. Do allocations in a loop until * we have covered the range passed in. */ tp = xfs_trans_alloc(mp, XFS_TRANS_STRAT_WRITE); error = xfs_trans_reserve(tp, nres, XFS_WRITE_LOG_RES(mp), 0, XFS_TRANS_PERM_LOG_RES, XFS_WRITE_LOG_COUNT); if (error) { xfs_trans_cancel(tp, 0); goto error0; } xfs_ilock(ip, XFS_ILOCK_EXCL); xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); xfs_trans_ihold(tp, ip); /* * Modify the unwritten extent state of the buffer. */ XFS_BMAP_INIT(&free_list, &firstfsb); nimaps = 1; error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, XFS_BMAPI_WRITE, &firstfsb, 1, &imap, &nimaps, &free_list); if (error) goto error_on_bmapi_transaction; error = xfs_bmap_finish(&(tp), &(free_list), firstfsb, &committed); if (error) goto error_on_bmapi_transaction; error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES, NULL); xfs_iunlock(ip, XFS_ILOCK_EXCL); if (error) goto error0; if ((numblks_fsb = imap.br_blockcount) == 0) { /* * The numblks_fsb value should always get * smaller, otherwise the loop is stuck. */ ASSERT(imap.br_blockcount); break; } offset_fsb += numblks_fsb; count_fsb -= numblks_fsb; } while (count_fsb > 0); return 0; error_on_bmapi_transaction: xfs_bmap_cancel(&free_list); xfs_trans_cancel(tp, (XFS_TRANS_RELEASE_LOG_RES | XFS_TRANS_ABORT)); xfs_iunlock(ip, XFS_ILOCK_EXCL); error0: return XFS_ERROR(error); }
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