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xfs: use a union for i_cowextsize and i_flushiter

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The i_cowextsize field is only used for v3 inodes, and the i_flushiter
field is only used for v1/v2 inodes.  Use a union to pack the inode a
littler better after adding a few missing guards around their usage.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
This commit is contained in:
Christoph Hellwig 2021-03-29 11:11:43 -07:00 • committed by Darrick J. Wong
parent b231b1221b
commit ee7b83fd36
4 changed files with 20 additions and 11 deletions
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3
fs/xfs/libxfs/xfs_inode_buf.c
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@ -193,7 +193,8 @@ xfs_inode_from_disk(
* inode. If the inode is unused, mode is zero and we shouldn't mess
* with the uninitialized part of it.
*/
ip->i_flushiter = be16_to_cpu(from->di_flushiter);
if (!xfs_sb_version_has_v3inode(&ip->i_mount->m_sb))
ip->i_flushiter = be16_to_cpu(from->di_flushiter);
inode->i_generation = be32_to_cpu(from->di_gen);
inode->i_mode = be16_to_cpu(from->di_mode);
if (!inode->i_mode)