diff options
| author | Chandan Babu R <chandan.babu@oracle.com> | 2021-08-09 12:05:22 +0530 |
|---|---|---|
| committer | Chandan Babu R <chandan.babu@oracle.com> | 2022-04-11 04:11:17 +0000 |
| commit | 95f0b95e2b686ceaa3f465e9fa079f22e0fe7665 (patch) | |
| tree | 6ad802b3e0cc7f9cccc1d7e051bc7d5c6f003955 /fs/xfs/xfs_iomap.c | |
| parent | 3b0d9fd369ea48419ccb578e0bafa4c54df63ba6 (diff) | |
xfs: Define max extent length based on on-disk format definition
The maximum extent length depends on maximum block count that can be stored in
a BMBT record. Hence this commit defines MAXEXTLEN based on
BMBT_BLOCKCOUNT_BITLEN.
While at it, the commit also renames MAXEXTLEN to XFS_MAX_BMBT_EXTLEN.
Suggested-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Chandan Babu R <chandan.babu@oracle.com>
Diffstat (limited to 'fs/xfs/xfs_iomap.c')
| -rw-r--r-- | fs/xfs/xfs_iomap.c | 28 |
1 files changed, 14 insertions, 14 deletions
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c index e552ce541ec2..87e1cf5060bd 100644 --- a/fs/xfs/xfs_iomap.c +++ b/fs/xfs/xfs_iomap.c @@ -402,7 +402,7 @@ xfs_iomap_prealloc_size( */ plen = prev.br_blockcount; while (xfs_iext_prev_extent(ifp, &ncur, &got)) { - if (plen > MAXEXTLEN / 2 || + if (plen > XFS_MAX_BMBT_EXTLEN / 2 || isnullstartblock(got.br_startblock) || got.br_startoff + got.br_blockcount != prev.br_startoff || got.br_startblock + got.br_blockcount != prev.br_startblock) @@ -414,23 +414,23 @@ xfs_iomap_prealloc_size( /* * If the size of the extents is greater than half the maximum extent * length, then use the current offset as the basis. This ensures that - * for large files the preallocation size always extends to MAXEXTLEN - * rather than falling short due to things like stripe unit/width - * alignment of real extents. + * for large files the preallocation size always extends to + * XFS_BMBT_MAX_EXTLEN rather than falling short due to things like stripe + * unit/width alignment of real extents. */ alloc_blocks = plen * 2; - if (alloc_blocks > MAXEXTLEN) + if (alloc_blocks > XFS_MAX_BMBT_EXTLEN) alloc_blocks = XFS_B_TO_FSB(mp, offset); qblocks = alloc_blocks; /* - * MAXEXTLEN is not a power of two value but we round the prealloc down - * to the nearest power of two value after throttling. To prevent the - * round down from unconditionally reducing the maximum supported - * prealloc size, we round up first, apply appropriate throttling, - * round down and cap the value to MAXEXTLEN. + * XFS_BMBT_MAX_EXTLEN is not a power of two value but we round the prealloc + * down to the nearest power of two value after throttling. To prevent + * the round down from unconditionally reducing the maximum supported + * prealloc size, we round up first, apply appropriate throttling, round + * down and cap the value to XFS_BMBT_MAX_EXTLEN. */ - alloc_blocks = XFS_FILEOFF_MIN(roundup_pow_of_two(MAXEXTLEN), + alloc_blocks = XFS_FILEOFF_MIN(roundup_pow_of_two(XFS_MAX_BMBT_EXTLEN), alloc_blocks); freesp = percpu_counter_read_positive(&mp->m_fdblocks); @@ -478,14 +478,14 @@ xfs_iomap_prealloc_size( */ if (alloc_blocks) alloc_blocks = rounddown_pow_of_two(alloc_blocks); - if (alloc_blocks > MAXEXTLEN) - alloc_blocks = MAXEXTLEN; + if (alloc_blocks > XFS_MAX_BMBT_EXTLEN) + alloc_blocks = XFS_MAX_BMBT_EXTLEN; /* * If we are still trying to allocate more space than is * available, squash the prealloc hard. This can happen if we * have a large file on a small filesystem and the above - * lowspace thresholds are smaller than MAXEXTLEN. + * lowspace thresholds are smaller than XFS_BMBT_MAX_EXTLEN. */ while (alloc_blocks && alloc_blocks >= freesp) alloc_blocks >>= 4; |