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ext4: Check for atomic writes support in write iter

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Let's validate the given constraints for atomic write request.
Otherwise it will fail with -EINVAL. Currently atomic write is only
supported on DIO, so for buffered-io it will return -EOPNOTSUPP.

Reviewed-by: John Garry <john.g.garry@oracle.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Ritesh Harjani (IBM) 2024-11-04 16:22:58 -08:00 committed by Darrick J. Wong
parent 6dfc1c1d59
commit 43c696f9d0
1 changed files with 14 additions and 0 deletions
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14
fs/ext4/file.c
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@ -692,6 +692,20 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
if (IS_DAX(inode))
return ext4_dax_write_iter(iocb, from);
#endif
if (iocb->ki_flags & IOCB_ATOMIC) {
size_t len = iov_iter_count(from);
int ret;
if (len < EXT4_SB(inode->i_sb)->s_awu_min ||
len > EXT4_SB(inode->i_sb)->s_awu_max)
return -EINVAL;
ret = generic_atomic_write_valid(iocb, from);
if (ret)
return ret;
}
if (iocb->ki_flags & IOCB_DIRECT)
return ext4_dio_write_iter(iocb, from);
else