xfs: Check for extent overflow when removing dir entries

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Directory entry removal must always succeed; Hence XFS does the
following during low disk space scenario:
1. Data/Free blocks linger until a future remove operation.
2. Dabtree blocks would be swapped with the last block in the leaf space
   and then the new last block will be unmapped.

This facility is reused during low inode extent count scenario i.e. this
commit causes xfs_bmap_del_extent_real() to return -ENOSPC error code so
that the above mentioned behaviour is exercised causing no change to the
directory's extent count.

Signed-off-by: Chandan Babu R <chandanrlinux@gmail.com>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

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This commit is contained in:

Chandan Babu R 2021-01-22 16:48:12 -08:00 • committed by Darrick J. Wong

parent f5d9274919

commit 0dbc5cb1a9

1 changed files with 18 additions and 0 deletions

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fs/xfs/libxfs/xfs_bmap.c

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