diff options
| author | Christoph Hellwig <hch@lst.de> | 2017-02-06 19:51:03 +0100 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2017-02-07 02:47:47 +0100 |
| commit | 3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5 (patch) | |
| tree | 5b9681a04b0fddce02510303a33546794f2b0568 /fs/xfs/xfs_iomap.c | |
| parent | xfs: go straight to real allocations for direct I/O COW writes (diff) | |
| download | linux-3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5.tar.xz linux-3c68d44a2b49a0ac9165faa9c191e1e618c8a8d5.zip | |
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>
Diffstat (limited to 'fs/xfs/xfs_iomap.c')
| -rw-r--r-- | fs/xfs/xfs_iomap.c | 31 |
1 files changed, 12 insertions, 19 deletions
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index 06bfc82dd00b..e0bc290396dc 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -995,37 +995,31 @@ xfs_file_iomap_begin( offset_fsb = XFS_B_TO_FSBT(mp, offset); end_fsb = XFS_B_TO_FSB(mp, offset + length); - if (xfs_is_reflink_inode(ip) && - (flags & IOMAP_WRITE) && (flags & IOMAP_DIRECT)) { - shared = xfs_reflink_find_cow_mapping(ip, offset, &imap); - if (shared) { - xfs_iunlock(ip, lockmode); - goto alloc_done; - } - ASSERT(!isnullstartblock(imap.br_startblock)); - } - error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap, &nimaps, 0); if (error) goto out_unlock; - if ((flags & IOMAP_REPORT) || - (xfs_is_reflink_inode(ip) && - (flags & IOMAP_WRITE) && (flags & IOMAP_DIRECT))) { + if (flags & IOMAP_REPORT) { /* Trim the mapping to the nearest shared extent boundary. */ error = xfs_reflink_trim_around_shared(ip, &imap, &shared, &trimmed); if (error) goto out_unlock; - - ASSERT((flags & IOMAP_REPORT) || !shared); } if ((flags & (IOMAP_WRITE | IOMAP_ZERO)) && xfs_is_reflink_inode(ip)) { - error = xfs_reflink_reserve_cow(ip, &imap, &shared); - if (error) - goto out_unlock; + if (flags & IOMAP_DIRECT) { + /* may drop and re-acquire the ilock */ + error = xfs_reflink_allocate_cow(ip, &imap, &shared, + &lockmode); + if (error) + goto out_unlock; + } else { + error = xfs_reflink_reserve_cow(ip, &imap, &shared); + if (error) + goto out_unlock; + } end_fsb = imap.br_startoff + imap.br_blockcount; length = XFS_FSB_TO_B(mp, end_fsb) - offset; @@ -1054,7 +1048,6 @@ xfs_file_iomap_begin( if (error) return error; -alloc_done: iomap->flags = IOMAP_F_NEW; trace_xfs_iomap_alloc(ip, offset, length, 0, &imap); } else { |