| /* |
| * Copyright (c) 2000-2006 Silicon Graphics, Inc. |
| * All Rights Reserved. |
| * |
| * This program is free software; you can redistribute it and/or |
| * modify it under the terms 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. See the |
| * GNU General Public License for more details. |
| * |
| * You should have received a copy of the GNU General Public License |
| * along with this program; if not, write the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| */ |
| #include "xfs.h" |
| #include "xfs_fs.h" |
| #include "xfs_bit.h" |
| #include "xfs_log.h" |
| #include "xfs_inum.h" |
| #include "xfs_trans.h" |
| #include "xfs_sb.h" |
| #include "xfs_ag.h" |
| #include "xfs_dir2.h" |
| #include "xfs_alloc.h" |
| #include "xfs_dmapi.h" |
| #include "xfs_quota.h" |
| #include "xfs_mount.h" |
| #include "xfs_bmap_btree.h" |
| #include "xfs_alloc_btree.h" |
| #include "xfs_ialloc_btree.h" |
| #include "xfs_dir2_sf.h" |
| #include "xfs_attr_sf.h" |
| #include "xfs_dinode.h" |
| #include "xfs_inode.h" |
| #include "xfs_ialloc.h" |
| #include "xfs_btree.h" |
| #include "xfs_bmap.h" |
| #include "xfs_rtalloc.h" |
| #include "xfs_error.h" |
| #include "xfs_itable.h" |
| #include "xfs_rw.h" |
| #include "xfs_acl.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_inode_t *ip, |
| xfs_off_t offset, |
| ssize_t count) |
| { |
| 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)((ip->i_new_size >> 32) & 0xffffffff)), |
| (void *)((unsigned long)(ip->i_new_size & 0xffffffff)), |
| (void *)((unsigned long)current_pid()), |
| (void *)NULL, |
| (void *)NULL, |
| (void *)NULL, |
| (void *)NULL, |
| (void *)NULL, |
| (void *)NULL); |
| } |
| |
| void |
| xfs_iomap_map_trace( |
| int tag, |
| xfs_inode_t *ip, |
| xfs_off_t offset, |
| ssize_t count, |
| xfs_iomap_t *iomapp, |
| xfs_bmbt_irec_t *imapp, |
| int flags) |
| { |
| 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_inode_t *ip, |
| 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 = ip->i_mount; |
| int pbm; |
| xfs_fsblock_t start_block; |
| |
| |
| for (pbm = 0; imaps && pbm < iomaps; imaps--, iomapp++, imap++, pbm++) { |
| 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; |
| |
| if (XFS_IS_REALTIME_INODE(ip)) { |
| iomapp->iomap_flags |= IOMAP_REALTIME; |
| iomapp->iomap_target = mp->m_rtdev_targp; |
| } else { |
| iomapp->iomap_target = mp->m_ddev_targp; |
| } |
| 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(ip, start_block); |
| if (ISUNWRITTEN(imap)) |
| iomapp->iomap_flags |= IOMAP_UNWRITTEN; |
| } |
| |
| offset += iomapp->iomap_bsize - iomapp->iomap_delta; |
| } |
| return pbm; /* Return the number filled */ |
| } |
| |
| int |
| xfs_iomap( |
| xfs_inode_t *ip, |
| xfs_off_t offset, |
| ssize_t count, |
| int flags, |
| xfs_iomap_t *iomapp, |
| int *niomaps) |
| { |
| xfs_mount_t *mp = ip->i_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; |
| |
| ASSERT((ip->i_d.di_mode & S_IFMT) == S_IFREG); |
| |
| if (XFS_FORCED_SHUTDOWN(mp)) |
| return XFS_ERROR(EIO); |
| |
| switch (flags & (BMAPI_READ | BMAPI_WRITE | BMAPI_ALLOCATE)) { |
| case BMAPI_READ: |
| xfs_iomap_enter_trace(XFS_IOMAP_READ_ENTER, ip, offset, count); |
| lockmode = xfs_ilock_map_shared(ip); |
| bmapi_flags = XFS_BMAPI_ENTIRE; |
| break; |
| case BMAPI_WRITE: |
| xfs_iomap_enter_trace(XFS_IOMAP_WRITE_ENTER, ip, offset, count); |
| lockmode = XFS_ILOCK_EXCL; |
| if (flags & BMAPI_IGNSTATE) |
| bmapi_flags |= XFS_BMAPI_IGSTATE|XFS_BMAPI_ENTIRE; |
| xfs_ilock(ip, lockmode); |
| break; |
| case BMAPI_ALLOCATE: |
| xfs_iomap_enter_trace(XFS_IOMAP_ALLOC_ENTER, ip, offset, count); |
| lockmode = XFS_ILOCK_SHARED; |
| bmapi_flags = XFS_BMAPI_ENTIRE; |
| |
| /* Attempt non-blocking lock */ |
| if (flags & BMAPI_TRYLOCK) { |
| if (!xfs_ilock_nowait(ip, lockmode)) |
| return XFS_ERROR(EAGAIN); |
| } else { |
| xfs_ilock(ip, lockmode); |
| } |
| break; |
| 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(NULL, ip, offset_fsb, |
| (xfs_filblks_t)(end_fsb - offset_fsb), |
| bmapi_flags, NULL, 0, &imap, |
| &nimaps, NULL, NULL); |
| |
| if (error) |
| goto out; |
| |
| switch (flags & (BMAPI_WRITE|BMAPI_ALLOCATE)) { |
| case BMAPI_WRITE: |
| /* If we found an extent, return it */ |
| if (nimaps && |
| (imap.br_startblock != HOLESTARTBLOCK) && |
| (imap.br_startblock != DELAYSTARTBLOCK)) { |
| xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, ip, |
| offset, count, iomapp, &imap, flags); |
| break; |
| } |
| |
| if (flags & (BMAPI_DIRECT|BMAPI_MMAP)) { |
| error = xfs_iomap_write_direct(ip, offset, count, flags, |
| &imap, &nimaps, nimaps); |
| } else { |
| error = xfs_iomap_write_delay(ip, offset, count, flags, |
| &imap, &nimaps); |
| } |
| if (!error) { |
| xfs_iomap_map_trace(XFS_IOMAP_ALLOC_MAP, ip, |
| offset, count, iomapp, &imap, flags); |
| } |
| iomap_flags = IOMAP_NEW; |
| break; |
| case BMAPI_ALLOCATE: |
| /* If we found an extent, return it */ |
| xfs_iunlock(ip, lockmode); |
| lockmode = 0; |
| |
| if (nimaps && !isnullstartblock(imap.br_startblock)) { |
| xfs_iomap_map_trace(XFS_IOMAP_WRITE_MAP, ip, |
| offset, count, iomapp, &imap, flags); |
| break; |
| } |
| |
| error = xfs_iomap_write_allocate(ip, offset, count, |
| &imap, &nimaps); |
| break; |
| } |
| |
| if (nimaps) { |
| *niomaps = xfs_imap_to_bmap(ip, offset, &imap, |
| iomapp, nimaps, *niomaps, iomap_flags); |
| } else if (niomaps) { |
| *niomaps = 0; |
| } |
| |
| out: |
| if (lockmode) |
| xfs_iunlock(ip, lockmode); |
| return XFS_ERROR(error); |
| } |
| |
| |
| STATIC int |
| xfs_iomap_eof_align_last_fsb( |
| xfs_mount_t *mp, |
| xfs_inode_t *ip, |
| xfs_extlen_t extsize, |
| xfs_fileoff_t *last_fsb) |
| { |
| xfs_fileoff_t new_last_fsb = 0; |
| xfs_extlen_t align; |
| int eof, error; |
| |
| if (XFS_IS_REALTIME_INODE(ip)) |
| ; |
| /* |
| * If mounted with the "-o swalloc" option, roundup the allocation |
| * request to a stripe width boundary if the file size is >= |
| * stripe width and we are allocating past the allocation eof. |
| */ |
| else if (mp->m_swidth && (mp->m_flags & XFS_MOUNT_SWALLOC) && |
| (ip->i_size >= XFS_FSB_TO_B(mp, mp->m_swidth))) |
| new_last_fsb = roundup_64(*last_fsb, mp->m_swidth); |
| /* |
| * Roundup the allocation request to a stripe unit (m_dalign) boundary |
| * if the file size is >= stripe unit size, and we are allocating past |
| * the allocation eof. |
| */ |
| else if (mp->m_dalign && (ip->i_size >= XFS_FSB_TO_B(mp, mp->m_dalign))) |
| new_last_fsb = roundup_64(*last_fsb, mp->m_dalign); |
| |
| /* |
| * Always round up the allocation request to an extent boundary |
| * (when file on a real-time subvolume or has di_extsize hint). |
| */ |
| if (extsize) { |
| if (new_last_fsb) |
| align = roundup_64(new_last_fsb, extsize); |
| else |
| align = extsize; |
| new_last_fsb = roundup_64(*last_fsb, align); |
| } |
| |
| if (new_last_fsb) { |
| error = xfs_bmap_eof(ip, new_last_fsb, XFS_DATA_FORK, &eof); |
| if (error) |
| return error; |
| if (eof) |
| *last_fsb = new_last_fsb; |
| } |
| return 0; |
| } |
| |
| 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_inodes(ip); |
| xfs_ilock(ip, XFS_ILOCK_EXCL); |
| *fsynced = 3; |
| return 0; |
| } |
| return 1; |
| } |
| |
| STATIC int |
| xfs_cmn_err_fsblock_zero( |
| xfs_inode_t *ip, |
| xfs_bmbt_irec_t *imap) |
| { |
| xfs_cmn_err(XFS_PTAG_FSBLOCK_ZERO, CE_ALERT, ip->i_mount, |
| "Access to block zero in inode %llu " |
| "start_block: %llx start_off: %llx " |
| "blkcnt: %llx extent-state: %x\n", |
| (unsigned long long)ip->i_ino, |
| (unsigned long long)imap->br_startblock, |
| (unsigned long long)imap->br_startoff, |
| (unsigned long long)imap->br_blockcount, |
| imap->br_state); |
| return EFSCORRUPTED; |
| } |
| |
| int |
| xfs_iomap_write_direct( |
| xfs_inode_t *ip, |
| xfs_off_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_fileoff_t offset_fsb; |
| xfs_fileoff_t last_fsb; |
| xfs_filblks_t count_fsb, resaligned; |
| xfs_fsblock_t firstfsb; |
| xfs_extlen_t extsz, temp; |
| int nimaps; |
| int bmapi_flag; |
| int quota_flag; |
| int rt; |
| xfs_trans_t *tp; |
| xfs_bmbt_irec_t imap; |
| xfs_bmap_free_t free_list; |
| uint qblocks, resblks, resrtextents; |
| int committed; |
| int error; |
| |
| /* |
| * 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); |
| |
| rt = XFS_IS_REALTIME_INODE(ip); |
| extsz = xfs_get_extsz_hint(ip); |
| |
| offset_fsb = XFS_B_TO_FSBT(mp, offset); |
| last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); |
| if ((offset + count) > ip->i_size) { |
| error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); |
| if (error) |
| goto error_out; |
| } else { |
| if (found && (ret_imap->br_startblock == HOLESTARTBLOCK)) |
| last_fsb = MIN(last_fsb, (xfs_fileoff_t) |
| ret_imap->br_blockcount + |
| ret_imap->br_startoff); |
| } |
| count_fsb = last_fsb - offset_fsb; |
| ASSERT(count_fsb > 0); |
| |
| resaligned = count_fsb; |
| if (unlikely(extsz)) { |
| if ((temp = do_mod(offset_fsb, extsz))) |
| resaligned += temp; |
| if ((temp = do_mod(resaligned, extsz))) |
| resaligned += extsz - temp; |
| } |
| |
| if (unlikely(rt)) { |
| resrtextents = qblocks = resaligned; |
| resrtextents /= mp->m_sb.sb_rextsize; |
| resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0); |
| quota_flag = XFS_QMOPT_RES_RTBLKS; |
| } else { |
| resrtextents = 0; |
| resblks = qblocks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned); |
| quota_flag = XFS_QMOPT_RES_REGBLKS; |
| } |
| |
| /* |
| * Allocate and setup the transaction |
| */ |
| xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| tp = xfs_trans_alloc(mp, XFS_TRANS_DIOSTRAT); |
| error = xfs_trans_reserve(tp, resblks, |
| XFS_WRITE_LOG_RES(mp), resrtextents, |
| XFS_TRANS_PERM_LOG_RES, |
| XFS_WRITE_LOG_COUNT); |
| /* |
| * Check for running out of space, note: need lock to return |
| */ |
| if (error) |
| xfs_trans_cancel(tp, 0); |
| xfs_ilock(ip, XFS_ILOCK_EXCL); |
| if (error) |
| goto error_out; |
| |
| error = XFS_TRANS_RESERVE_QUOTA_NBLKS(mp, tp, ip, |
| qblocks, 0, quota_flag); |
| if (error) |
| goto error1; |
| |
| xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); |
| xfs_trans_ihold(tp, ip); |
| |
| bmapi_flag = XFS_BMAPI_WRITE; |
| if ((flags & BMAPI_DIRECT) && (offset < ip->i_size || extsz)) |
| bmapi_flag |= XFS_BMAPI_PREALLOC; |
| |
| /* |
| * Issue the xfs_bmapi() call to allocate the blocks |
| */ |
| xfs_bmap_init(&free_list, &firstfsb); |
| nimaps = 1; |
| error = xfs_bmapi(tp, ip, offset_fsb, count_fsb, bmapi_flag, |
| &firstfsb, 0, &imap, &nimaps, &free_list, NULL); |
| if (error) |
| goto error0; |
| |
| /* |
| * Complete the transaction |
| */ |
| error = xfs_bmap_finish(&tp, &free_list, &committed); |
| if (error) |
| goto error0; |
| error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
| if (error) |
| goto error_out; |
| |
| /* |
| * Copy any maps to caller's array and return any error. |
| */ |
| if (nimaps == 0) { |
| error = ENOSPC; |
| goto error_out; |
| } |
| |
| if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip))) { |
| error = xfs_cmn_err_fsblock_zero(ip, &imap); |
| goto error_out; |
| } |
| |
| *ret_imap = imap; |
| *nmaps = 1; |
| return 0; |
| |
| error0: /* Cancel bmap, unlock inode, unreserve quota blocks, cancel trans */ |
| xfs_bmap_cancel(&free_list); |
| XFS_TRANS_UNRESERVE_QUOTA_NBLKS(mp, tp, ip, qblocks, 0, quota_flag); |
| |
| 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); |
| } |
| |
| /* |
| * If the caller is doing a write at the end of the file, |
| * then extend the allocation out to the file system's write |
| * iosize. We clean up any extra space left over when the |
| * file is closed in xfs_inactive(). |
| * |
| * For sync writes, we are flushing delayed allocate space to |
| * try to make additional space available for allocation near |
| * the filesystem full boundary - preallocation hurts in that |
| * situation, of course. |
| */ |
| STATIC int |
| xfs_iomap_eof_want_preallocate( |
| xfs_mount_t *mp, |
| xfs_inode_t *ip, |
| xfs_off_t offset, |
| size_t count, |
| int ioflag, |
| xfs_bmbt_irec_t *imap, |
| int nimaps, |
| int *prealloc) |
| { |
| xfs_fileoff_t start_fsb; |
| xfs_filblks_t count_fsb; |
| xfs_fsblock_t firstblock; |
| int n, error, imaps; |
| |
| *prealloc = 0; |
| if ((ioflag & BMAPI_SYNC) || (offset + count) <= ip->i_size) |
| return 0; |
| |
| /* |
| * If there are any real blocks past eof, then don't |
| * do any speculative allocation. |
| */ |
| start_fsb = XFS_B_TO_FSBT(mp, ((xfs_ufsize_t)(offset + count - 1))); |
| count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_MAXIOFFSET(mp)); |
| while (count_fsb > 0) { |
| imaps = nimaps; |
| firstblock = NULLFSBLOCK; |
| error = xfs_bmapi(NULL, ip, start_fsb, count_fsb, 0, |
| &firstblock, 0, imap, &imaps, NULL, NULL); |
| if (error) |
| return error; |
| for (n = 0; n < imaps; n++) { |
| if ((imap[n].br_startblock != HOLESTARTBLOCK) && |
| (imap[n].br_startblock != DELAYSTARTBLOCK)) |
| return 0; |
| start_fsb += imap[n].br_blockcount; |
| count_fsb -= imap[n].br_blockcount; |
| } |
| } |
| *prealloc = 1; |
| return 0; |
| } |
| |
| int |
| xfs_iomap_write_delay( |
| xfs_inode_t *ip, |
| xfs_off_t offset, |
| size_t count, |
| int ioflag, |
| xfs_bmbt_irec_t *ret_imap, |
| int *nmaps) |
| { |
| xfs_mount_t *mp = ip->i_mount; |
| xfs_fileoff_t offset_fsb; |
| xfs_fileoff_t last_fsb; |
| xfs_off_t aligned_offset; |
| xfs_fileoff_t ioalign; |
| xfs_fsblock_t firstblock; |
| xfs_extlen_t extsz; |
| int nimaps; |
| xfs_bmbt_irec_t imap[XFS_WRITE_IMAPS]; |
| int prealloc, fsynced = 0; |
| int error; |
| |
| ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL)); |
| |
| /* |
| * 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); |
| |
| extsz = xfs_get_extsz_hint(ip); |
| offset_fsb = XFS_B_TO_FSBT(mp, offset); |
| |
| retry: |
| error = xfs_iomap_eof_want_preallocate(mp, ip, offset, count, |
| ioflag, imap, XFS_WRITE_IMAPS, &prealloc); |
| if (error) |
| return error; |
| |
| if (prealloc) { |
| aligned_offset = XFS_WRITEIO_ALIGN(mp, (offset + count - 1)); |
| ioalign = XFS_B_TO_FSBT(mp, aligned_offset); |
| last_fsb = ioalign + mp->m_writeio_blocks; |
| } else { |
| last_fsb = XFS_B_TO_FSB(mp, ((xfs_ufsize_t)(offset + count))); |
| } |
| |
| if (prealloc || extsz) { |
| error = xfs_iomap_eof_align_last_fsb(mp, ip, extsz, &last_fsb); |
| if (error) |
| return error; |
| } |
| |
| nimaps = XFS_WRITE_IMAPS; |
| firstblock = NULLFSBLOCK; |
| 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, NULL); |
| 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 - flush delalloc, and retry.. |
| */ |
| if (nimaps == 0) { |
| xfs_iomap_enter_trace(XFS_IOMAP_WRITE_NOSPACE, |
| ip, offset, count); |
| if (xfs_flush_space(ip, &fsynced, &ioflag)) |
| return XFS_ERROR(ENOSPC); |
| |
| error = 0; |
| goto retry; |
| } |
| |
| if (!(imap[0].br_startblock || XFS_IS_REALTIME_INODE(ip))) |
| return xfs_cmn_err_fsblock_zero(ip, &imap[0]); |
| |
| *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. |
| * |
| * We no longer bother to look at the incoming map - all we have to |
| * guarantee is that whatever we allocate fills the required range. |
| */ |
| int |
| xfs_iomap_write_allocate( |
| xfs_inode_t *ip, |
| xfs_off_t offset, |
| size_t count, |
| 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_trans_t *tp; |
| int 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 = XFS_B_TO_FSBT(mp, offset); |
| count_fsb = map->br_blockcount; |
| map_start_fsb = map->br_startoff; |
| |
| 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); |
| tp->t_flags |= XFS_TRANS_RESERVE; |
| 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) { |
| 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); |
| |
| /* |
| * it is possible that the extents have changed since |
| * we did the read call as we dropped the ilock for a |
| * while. We have to be careful about truncates or hole |
| * punchs here - we are not allowed to allocate |
| * non-delalloc blocks here. |
| * |
| * The only protection against truncation is the pages |
| * for the range we are being asked to convert are |
| * locked and hence a truncate will block on them |
| * first. |
| * |
| * As a result, if we go beyond the range we really |
| * need and hit an delalloc extent boundary followed by |
| * a hole while we have excess blocks in the map, we |
| * will fill the hole incorrectly and overrun the |
| * transaction reservation. |
| * |
| * Using a single map prevents this as we are forced to |
| * check each map we look for overlap with the desired |
| * range and abort as soon as we find it. Also, given |
| * that we only return a single map, having one beyond |
| * what we can return is probably a bit silly. |
| * |
| * We also need to check that we don't go beyond EOF; |
| * this is a truncate optimisation as a truncate sets |
| * the new file size before block on the pages we |
| * currently have locked under writeback. Because they |
| * are about to be tossed, we don't need to write them |
| * back.... |
| */ |
| nimaps = 1; |
| end_fsb = XFS_B_TO_FSB(mp, ip->i_size); |
| error = xfs_bmap_last_offset(NULL, ip, &last_block, |
| XFS_DATA_FORK); |
| if (error) |
| goto trans_cancel; |
| |
| 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, NULL); |
| if (error) |
| goto trans_cancel; |
| |
| error = xfs_bmap_finish(&tp, &free_list, &committed); |
| if (error) |
| goto trans_cancel; |
| |
| error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
| 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 |
| */ |
| if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip))) |
| return xfs_cmn_err_fsblock_zero(ip, &imap); |
| |
| if ((offset_fsb >= imap.br_startoff) && |
| (offset_fsb < (imap.br_startoff + |
| imap.br_blockcount))) { |
| *map = imap; |
| *retmap = 1; |
| XFS_STATS_INC(xs_xstrat_quick); |
| return 0; |
| } |
| |
| /* |
| * So far we have not mapped the requested part of the |
| * file, just surrounding data, try again. |
| */ |
| count_fsb -= imap.br_blockcount; |
| map_start_fsb = imap.br_startoff + imap.br_blockcount; |
| } |
| |
| 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, |
| xfs_off_t offset, |
| size_t count) |
| { |
| xfs_mount_t *mp = ip->i_mount; |
| xfs_fileoff_t offset_fsb; |
| xfs_filblks_t count_fsb; |
| xfs_filblks_t numblks_fsb; |
| xfs_fsblock_t firstfsb; |
| int nimaps; |
| xfs_trans_t *tp; |
| xfs_bmbt_irec_t imap; |
| xfs_bmap_free_t free_list; |
| uint resblks; |
| int committed; |
| int error; |
| |
| xfs_iomap_enter_trace(XFS_IOMAP_UNWRITTEN, ip, offset, count); |
| |
| offset_fsb = XFS_B_TO_FSBT(mp, offset); |
| count_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)offset + count); |
| count_fsb = (xfs_filblks_t)(count_fsb - offset_fsb); |
| |
| /* |
| * Reserve enough blocks in this transaction for two complete extent |
| * btree splits. We may be converting the middle part of an unwritten |
| * extent and in this case we will insert two new extents in the btree |
| * each of which could cause a full split. |
| * |
| * This reservation amount will be used in the first call to |
| * xfs_bmbt_split() to select an AG with enough space to satisfy the |
| * rest of the operation. |
| */ |
| resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0) << 1; |
| |
| do { |
| /* |
| * 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); |
| tp->t_flags |= XFS_TRANS_RESERVE; |
| error = xfs_trans_reserve(tp, resblks, |
| 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); |
| |
| /* |
| * 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|XFS_BMAPI_CONVERT, &firstfsb, |
| 1, &imap, &nimaps, &free_list, NULL); |
| if (error) |
| goto error_on_bmapi_transaction; |
| |
| error = xfs_bmap_finish(&(tp), &(free_list), &committed); |
| if (error) |
| goto error_on_bmapi_transaction; |
| |
| error = xfs_trans_commit(tp, XFS_TRANS_RELEASE_LOG_RES); |
| xfs_iunlock(ip, XFS_ILOCK_EXCL); |
| if (error) |
| return XFS_ERROR(error); |
| |
| if (!(imap.br_startblock || XFS_IS_REALTIME_INODE(ip))) |
| return xfs_cmn_err_fsblock_zero(ip, &imap); |
| |
| 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); |
| return XFS_ERROR(error); |
| } |