From 95f0b95e2b686ceaa3f465e9fa079f22e0fe7665 Mon Sep 17 00:00:00 2001 From: Chandan Babu R Date: Mon, 9 Aug 2021 12:05:22 +0530 Subject: 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 Reviewed-by: Darrick J. Wong Reviewed-by: Dave Chinner Signed-off-by: Chandan Babu R --- fs/xfs/libxfs/xfs_trans_resv.c | 11 ++++++----- 1 file changed, 6 insertions(+), 5 deletions(-) (limited to 'fs/xfs/libxfs/xfs_trans_resv.c') diff --git a/fs/xfs/libxfs/xfs_trans_resv.c b/fs/xfs/libxfs/xfs_trans_resv.c index 6f83d9b306ee..8e1d09e8cc9a 100644 --- a/fs/xfs/libxfs/xfs_trans_resv.c +++ b/fs/xfs/libxfs/xfs_trans_resv.c @@ -199,8 +199,8 @@ xfs_calc_inode_chunk_res( /* * Per-extent log reservation for the btree changes involved in freeing or * allocating a realtime extent. We have to be able to log as many rtbitmap - * blocks as needed to mark inuse MAXEXTLEN blocks' worth of realtime extents, - * as well as the realtime summary block. + * blocks as needed to mark inuse XFS_BMBT_MAX_EXTLEN blocks' worth of realtime + * extents, as well as the realtime summary block. */ static unsigned int xfs_rtalloc_log_count( @@ -210,7 +210,7 @@ xfs_rtalloc_log_count( unsigned int blksz = XFS_FSB_TO_B(mp, 1); unsigned int rtbmp_bytes; - rtbmp_bytes = (MAXEXTLEN / mp->m_sb.sb_rextsize) / NBBY; + rtbmp_bytes = (XFS_MAX_BMBT_EXTLEN / mp->m_sb.sb_rextsize) / NBBY; return (howmany(rtbmp_bytes, blksz) + 1) * num_ops; } @@ -247,7 +247,7 @@ xfs_rtalloc_log_count( * the inode's bmap btree: max depth * block size * the agfs of the ags from which the extents are allocated: 2 * sector * the superblock free block counter: sector size - * the realtime bitmap: ((MAXEXTLEN / rtextsize) / NBBY) bytes + * the realtime bitmap: ((XFS_BMBT_MAX_EXTLEN / rtextsize) / NBBY) bytes * the realtime summary: 1 block * the allocation btrees: 2 trees * (2 * max depth - 1) * block size * And the bmap_finish transaction can free bmap blocks in a join (t3): @@ -299,7 +299,8 @@ xfs_calc_write_reservation( * the agf for each of the ags: 2 * sector size * the agfl for each of the ags: 2 * sector size * the super block to reflect the freed blocks: sector size - * the realtime bitmap: 2 exts * ((MAXEXTLEN / rtextsize) / NBBY) bytes + * the realtime bitmap: + * 2 exts * ((XFS_BMBT_MAX_EXTLEN / rtextsize) / NBBY) bytes * the realtime summary: 2 exts * 1 block * worst case split in allocation btrees per extent assuming 2 extents: * 2 exts * 2 trees * (2 * max depth - 1) * block size -- cgit v1.2.3