xfs: allocate direct I/O COW blocks in iomap_begin
Instead of preallocating all the required COW blocks in the high-level write code do it inside the iomap code, like we do for all other I/O. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Christoph Hellwig
Darrick J. Wong
Родитель
a14234c72b
Коммит
3c68d44a2b
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@ -561,14 +561,6 @@ xfs_file_dio_aio_write(
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}
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trace_xfs_file_direct_write(ip, count, iocb->ki_pos);
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/* If this is a block-aligned directio CoW, remap immediately. */
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if (xfs_is_reflink_inode(ip) && !unaligned_io) {
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ret = xfs_reflink_allocate_cow_range(ip, iocb->ki_pos, count);
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if (ret)
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goto out;
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}
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ret = iomap_dio_rw(iocb, from, &xfs_iomap_ops, xfs_dio_write_end_io);
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out:
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xfs_iunlock(ip, iolock);
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@ -995,37 +995,31 @@ xfs_file_iomap_begin(
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offset_fsb = XFS_B_TO_FSBT(mp, offset);
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end_fsb = XFS_B_TO_FSB(mp, offset + length);
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if (xfs_is_reflink_inode(ip) &&
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(flags & IOMAP_WRITE) && (flags & IOMAP_DIRECT)) {
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shared = xfs_reflink_find_cow_mapping(ip, offset, &imap);
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if (shared) {
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xfs_iunlock(ip, lockmode);
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goto alloc_done;
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}
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ASSERT(!isnullstartblock(imap.br_startblock));
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}
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error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
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&nimaps, 0);
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if (error)
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goto out_unlock;
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if ((flags & IOMAP_REPORT) ||
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(xfs_is_reflink_inode(ip) &&
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(flags & IOMAP_WRITE) && (flags & IOMAP_DIRECT))) {
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if (flags & IOMAP_REPORT) {
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/* Trim the mapping to the nearest shared extent boundary. */
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error = xfs_reflink_trim_around_shared(ip, &imap, &shared,
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&trimmed);
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if (error)
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goto out_unlock;
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ASSERT((flags & IOMAP_REPORT) || !shared);
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}
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if ((flags & (IOMAP_WRITE | IOMAP_ZERO)) && xfs_is_reflink_inode(ip)) {
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error = xfs_reflink_reserve_cow(ip, &imap, &shared);
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if (error)
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goto out_unlock;
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if (flags & IOMAP_DIRECT) {
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/* may drop and re-acquire the ilock */
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error = xfs_reflink_allocate_cow(ip, &imap, &shared,
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&lockmode);
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if (error)
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goto out_unlock;
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} else {
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error = xfs_reflink_reserve_cow(ip, &imap, &shared);
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if (error)
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goto out_unlock;
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}
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end_fsb = imap.br_startoff + imap.br_blockcount;
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length = XFS_FSB_TO_B(mp, end_fsb) - offset;
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@ -1054,7 +1048,6 @@ xfs_file_iomap_begin(
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if (error)
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return error;
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alloc_done:
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iomap->flags = IOMAP_F_NEW;
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trace_xfs_iomap_alloc(ip, offset, length, 0, &imap);
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} else {
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@ -382,74 +382,75 @@ xfs_reflink_convert_cow(
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}
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/* Allocate all CoW reservations covering a range of blocks in a file. */
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static int
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__xfs_reflink_allocate_cow(
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int
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xfs_reflink_allocate_cow(
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struct xfs_inode *ip,
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xfs_fileoff_t *offset_fsb,
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xfs_fileoff_t end_fsb)
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struct xfs_bmbt_irec *imap,
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bool *shared,
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uint *lockmode)
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{
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struct xfs_mount *mp = ip->i_mount;
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struct xfs_bmbt_irec imap, got;
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xfs_fileoff_t offset_fsb = imap->br_startoff;
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xfs_filblks_t count_fsb = imap->br_blockcount;
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struct xfs_bmbt_irec got;
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struct xfs_defer_ops dfops;
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struct xfs_trans *tp;
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struct xfs_trans *tp = NULL;
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xfs_fsblock_t first_block;
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int nimaps, error, lockmode;
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bool shared, trimmed;
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int nimaps, error = 0;
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bool trimmed;
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xfs_filblks_t resaligned;
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xfs_extlen_t resblks;
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xfs_extlen_t resblks = 0;
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xfs_extnum_t idx;
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resaligned = xfs_aligned_fsb_count(*offset_fsb, end_fsb - *offset_fsb,
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xfs_get_cowextsz_hint(ip));
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resblks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
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error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0, &tp);
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if (error)
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return error;
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lockmode = XFS_ILOCK_EXCL;
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xfs_ilock(ip, lockmode);
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retry:
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ASSERT(xfs_is_reflink_inode(ip));
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ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL | XFS_ILOCK_SHARED));
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/*
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* Even if the extent is not shared we might have a preallocation for
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* it in the COW fork. If so use it.
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*/
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if (xfs_iext_lookup_extent(ip, ip->i_cowfp, *offset_fsb, &idx, &got) &&
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got.br_startoff <= *offset_fsb) {
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if (xfs_iext_lookup_extent(ip, ip->i_cowfp, offset_fsb, &idx, &got) &&
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got.br_startoff <= offset_fsb) {
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*shared = true;
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/* If we have a real allocation in the COW fork we're done. */
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if (!isnullstartblock(got.br_startblock)) {
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xfs_trim_extent(&got, *offset_fsb,
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end_fsb - *offset_fsb);
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*offset_fsb = got.br_startoff + got.br_blockcount;
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goto out_trans_cancel;
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xfs_trim_extent(&got, offset_fsb, count_fsb);
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*imap = got;
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goto convert;
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}
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xfs_trim_extent(imap, got.br_startoff, got.br_blockcount);
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} else {
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nimaps = 1;
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error = xfs_bmapi_read(ip, *offset_fsb, end_fsb - *offset_fsb,
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&imap, &nimaps, 0);
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error = xfs_reflink_trim_around_shared(ip, imap, shared, &trimmed);
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if (error || !*shared)
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goto out;
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}
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if (!tp) {
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resaligned = xfs_aligned_fsb_count(imap->br_startoff,
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imap->br_blockcount, xfs_get_cowextsz_hint(ip));
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resblks = XFS_DIOSTRAT_SPACE_RES(mp, resaligned);
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xfs_iunlock(ip, *lockmode);
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error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0, &tp);
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*lockmode = XFS_ILOCK_EXCL;
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xfs_ilock(ip, *lockmode);
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if (error)
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goto out_trans_cancel;
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ASSERT(nimaps == 1);
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return error;
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/* Trim the mapping to the nearest shared extent boundary. */
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error = xfs_reflink_trim_around_shared(ip, &imap, &shared,
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&trimmed);
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error = xfs_qm_dqattach_locked(ip, 0);
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if (error)
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goto out_trans_cancel;
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if (!shared) {
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*offset_fsb = imap.br_startoff + imap.br_blockcount;
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goto out_trans_cancel;
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}
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*offset_fsb = imap.br_startoff;
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end_fsb = imap.br_startoff + imap.br_blockcount;
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goto out;
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goto retry;
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}
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error = xfs_trans_reserve_quota_nblks(tp, ip, resblks, 0,
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XFS_QMOPT_RES_REGBLKS);
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if (error)
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goto out_trans_cancel;
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goto out;
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xfs_trans_ijoin(tp, ip, 0);
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@ -457,9 +458,9 @@ __xfs_reflink_allocate_cow(
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nimaps = 1;
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/* Allocate the entire reservation as unwritten blocks. */
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error = xfs_bmapi_write(tp, ip, *offset_fsb, end_fsb - *offset_fsb,
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error = xfs_bmapi_write(tp, ip, imap->br_startoff, imap->br_blockcount,
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XFS_BMAPI_COWFORK | XFS_BMAPI_PREALLOC, &first_block,
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resblks, &imap, &nimaps, &dfops);
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resblks, imap, &nimaps, &dfops);
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if (error)
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goto out_bmap_cancel;
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@ -470,57 +471,18 @@ __xfs_reflink_allocate_cow(
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error = xfs_trans_commit(tp);
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if (error)
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goto out_unlock;
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*offset_fsb = imap.br_startoff + imap.br_blockcount;
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out_unlock:
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xfs_iunlock(ip, lockmode);
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return error;
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return error;
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convert:
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return xfs_reflink_convert_cow_extent(ip, imap, offset_fsb, count_fsb,
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&dfops);
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out_bmap_cancel:
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xfs_defer_cancel(&dfops);
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xfs_trans_unreserve_quota_nblks(tp, ip, (long)resblks, 0,
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XFS_QMOPT_RES_REGBLKS);
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out_trans_cancel:
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xfs_trans_cancel(tp);
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goto out_unlock;
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}
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/* Allocate all CoW reservations covering a part of a file. */
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int
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xfs_reflink_allocate_cow_range(
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struct xfs_inode *ip,
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xfs_off_t offset,
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xfs_off_t count)
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{
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struct xfs_mount *mp = ip->i_mount;
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xfs_fileoff_t offset_fsb = XFS_B_TO_FSBT(mp, offset);
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xfs_fileoff_t end_fsb = XFS_B_TO_FSB(mp, offset + count);
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int error;
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ASSERT(xfs_is_reflink_inode(ip));
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trace_xfs_reflink_allocate_cow_range(ip, offset, count);
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/*
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* Make sure that the dquots are there.
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*/
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error = xfs_qm_dqattach(ip, 0);
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if (error)
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return error;
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while (offset_fsb < end_fsb) {
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error = __xfs_reflink_allocate_cow(ip, &offset_fsb, end_fsb);
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if (error) {
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trace_xfs_reflink_allocate_cow_range_error(ip, error,
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_RET_IP_);
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return error;
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}
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}
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/* Convert the CoW extents to regular. */
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return xfs_reflink_convert_cow(ip, offset, count);
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out:
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if (tp)
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xfs_trans_cancel(tp);
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return error;
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}
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/*
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@ -28,8 +28,8 @@ extern int xfs_reflink_trim_around_shared(struct xfs_inode *ip,
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extern int xfs_reflink_reserve_cow(struct xfs_inode *ip,
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struct xfs_bmbt_irec *imap, bool *shared);
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extern int xfs_reflink_allocate_cow_range(struct xfs_inode *ip,
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xfs_off_t offset, xfs_off_t count);
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extern int xfs_reflink_allocate_cow(struct xfs_inode *ip,
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struct xfs_bmbt_irec *imap, bool *shared, uint *lockmode);
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extern int xfs_reflink_convert_cow(struct xfs_inode *ip, xfs_off_t offset,
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xfs_off_t count);
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extern bool xfs_reflink_find_cow_mapping(struct xfs_inode *ip, xfs_off_t offset,
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@ -3247,7 +3247,6 @@ DEFINE_INODE_IREC_EVENT(xfs_reflink_cow_enospc);
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DEFINE_INODE_IREC_EVENT(xfs_reflink_convert_cow);
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DEFINE_RW_EVENT(xfs_reflink_reserve_cow);
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DEFINE_RW_EVENT(xfs_reflink_allocate_cow_range);
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DEFINE_SIMPLE_IO_EVENT(xfs_reflink_bounce_dio_write);
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DEFINE_IOMAP_EVENT(xfs_reflink_find_cow_mapping);
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@ -3257,7 +3256,6 @@ DEFINE_SIMPLE_IO_EVENT(xfs_reflink_cancel_cow_range);
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DEFINE_SIMPLE_IO_EVENT(xfs_reflink_end_cow);
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DEFINE_INODE_IREC_EVENT(xfs_reflink_cow_remap);
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DEFINE_INODE_ERROR_EVENT(xfs_reflink_allocate_cow_range_error);
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DEFINE_INODE_ERROR_EVENT(xfs_reflink_cancel_cow_range_error);
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DEFINE_INODE_ERROR_EVENT(xfs_reflink_end_cow_error);
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