xfs: use a union for i_cowextsize and i_flushiter
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>
diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
index 3c7eb01..88ec7be 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -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)
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 06d779c..e483c38 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -3483,8 +3483,10 @@ xfs_iflush(
xfs_inode_to_disk(ip, dip, iip->ili_item.li_lsn);
/* Wrap, we never let the log put out DI_MAX_FLUSH */
- if (ip->i_flushiter == DI_MAX_FLUSH)
- ip->i_flushiter = 0;
+ if (!xfs_sb_version_has_v3inode(&mp->m_sb)) {
+ if (ip->i_flushiter == DI_MAX_FLUSH)
+ ip->i_flushiter = 0;
+ }
xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK);
if (XFS_IFORK_Q(ip))
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index a76ca91..7a877db 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -58,8 +58,11 @@ typedef struct xfs_inode {
xfs_rfsblock_t i_nblocks; /* # of direct & btree blocks */
prid_t i_projid; /* owner's project id */
xfs_extlen_t i_extsize; /* basic/minimum extent size */
- xfs_extlen_t i_cowextsize; /* basic cow extent size */
- uint16_t i_flushiter; /* incremented on flush */
+ /* cowextsize is only used for v3 inodes, flushiter for v1/2 */
+ union {
+ xfs_extlen_t i_cowextsize; /* basic cow extent size */
+ uint16_t i_flushiter; /* incremented on flush */
+ };
struct xfs_icdinode i_d; /* most of ondisk inode */
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 7909e46..2028a4a 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -1123,7 +1123,8 @@ xfs_fill_fsxattr(
simple_fill_fsxattr(fa, xfs_ip2xflags(ip));
fa->fsx_extsize = XFS_FSB_TO_B(mp, ip->i_extsize);
- fa->fsx_cowextsize = XFS_FSB_TO_B(mp, ip->i_cowextsize);
+ if (ip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE)
+ fa->fsx_cowextsize = XFS_FSB_TO_B(mp, ip->i_cowextsize);
fa->fsx_projid = ip->i_projid;
if (ifp && (ifp->if_flags & XFS_IFEXTENTS))
fa->fsx_nextents = xfs_iext_count(ifp);
@@ -1523,11 +1524,13 @@ xfs_ioctl_setattr(
ip->i_extsize = XFS_B_TO_FSB(mp, fa->fsx_extsize);
else
ip->i_extsize = 0;
- if (xfs_sb_version_has_v3inode(&mp->m_sb) &&
- (ip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE))
- ip->i_cowextsize = XFS_B_TO_FSB(mp, fa->fsx_cowextsize);
- else
- ip->i_cowextsize = 0;
+
+ if (xfs_sb_version_has_v3inode(&mp->m_sb)) {
+ if (ip->i_d.di_flags2 & XFS_DIFLAG2_COWEXTSIZE)
+ ip->i_cowextsize = XFS_B_TO_FSB(mp, fa->fsx_cowextsize);
+ else
+ ip->i_cowextsize = 0;
+ }
error = xfs_trans_commit(tp);
