xfs: Validate atomic writes

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Validate that an atomic write adheres to length/offset rules. Currently
we can only write a single FS block.

For an IOCB with IOCB_ATOMIC set to get as far as xfs_file_write_iter(),
FMODE_CAN_ATOMIC_WRITE will need to be set for the file; for this,
ATOMICWRITES flags would also need to be set for the inode.

Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: John Garry <john.g.garry@oracle.com>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>

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John Garry 2024-11-04 16:14:04 -08:00 • committed by Darrick J. Wong

parent 6432c6e723

commit f096207d32

1 changed files with 14 additions and 0 deletions

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fs/xfs/xfs_file.c

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