[PATCH 8/9] xfs: move di_changecount to VFS inode

[Dave Chinner <david@xxxxxxxxxxxxx>]

From: Dave Chinner <dchinner@xxxxxxxxxx>

We can store the di_changecount in the i_version field of the VFS
inode and remove another 8 bytes from the xfs_icdinode.

Signed-off-by: Dave Chinner <dchinner@xxxxxxxxxx>
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
Signed-off-by: Dave Chinner <david@xxxxxxxxxxxxx>
---
 fs/xfs/libxfs/xfs_inode_buf.c | 4 ++--
 fs/xfs/libxfs/xfs_inode_buf.h | 1 -
 fs/xfs/xfs_icache.c           | 6 ++++--
 fs/xfs/xfs_inode.c            | 2 +-
 fs/xfs/xfs_inode_item.c       | 2 +-
 fs/xfs/xfs_trans_inode.c      | 2 +-
 6 files changed, 9 insertions(+), 8 deletions(-)

diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
index 0a3f10b..9807c21 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -251,7 +251,7 @@ xfs_inode_from_disk(
        to->di_flags    = be16_to_cpu(from->di_flags);
 
        if (to->di_version == 3) {
-               to->di_changecount = be64_to_cpu(from->di_changecount);
+               inode->i_version = be64_to_cpu(from->di_changecount);
                to->di_crtime.t_sec = be32_to_cpu(from->di_crtime.t_sec);
                to->di_crtime.t_nsec = be32_to_cpu(from->di_crtime.t_nsec);
                to->di_flags2 = be64_to_cpu(from->di_flags2);
@@ -300,7 +300,7 @@ xfs_inode_to_disk(
        to->di_flags = cpu_to_be16(from->di_flags);
 
        if (from->di_version == 3) {
-               to->di_changecount = cpu_to_be64(from->di_changecount);
+               to->di_changecount = cpu_to_be64(inode->i_version);
                to->di_crtime.t_sec = cpu_to_be32(from->di_crtime.t_sec);
                to->di_crtime.t_nsec = cpu_to_be32(from->di_crtime.t_nsec);
                to->di_flags2 = cpu_to_be64(from->di_flags2);
diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h
index 29fd9f1..c51bd12 100644
--- a/fs/xfs/libxfs/xfs_inode_buf.h
+++ b/fs/xfs/libxfs/xfs_inode_buf.h
@@ -47,7 +47,6 @@ struct xfs_icdinode {
        __uint16_t      di_dmstate;     /* DMIG state info */
        __uint16_t      di_flags;       /* random flags, XFS_DIFLAG_... */
 
-       __uint64_t      di_changecount; /* number of attribute changes */
        __uint64_t      di_flags2;      /* more random flags */
 
        xfs_ictimestamp_t di_crtime;    /* time created */
diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index 6401e3c..30eafad 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -138,9 +138,9 @@ xfs_inode_free(
  * When we recycle a reclaimable inode, we need to re-initialise the VFS inode
  * part of the structure. This is made more complex by the fact we store
  * information about the on-disk values in the VFS inode and so we can't just
- * overwrite it's values unconditionally. Hence we save the parameters we
+ * overwrite the values unconditionally. Hence we save the parameters we
  * need to retain across reinitialisation, and rewrite them into the VFS inode
- * after resetting it's state even if resetting fails.
+ * after reinitialisation even if it fails.
  */
 static int
 xfs_reinit_inode(
@@ -150,11 +150,13 @@ xfs_reinit_inode(
        int             error;
        uint32_t        nlink = inode->i_nlink;
        uint32_t        generation = inode->i_generation;
+       uint64_t        version = inode->i_version;
 
        error = inode_init_always(mp->m_super, inode);
 
        set_nlink(inode, nlink);
        inode->i_generation = generation;
+       inode->i_version = version;
        return error;
 }
 
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index e8f87c7..16fabbf 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -841,7 +841,7 @@ xfs_ialloc(
        ip->i_d.di_flags = 0;
 
        if (ip->i_d.di_version == 3) {
-               ip->i_d.di_changecount = 1;
+               inode->i_version = 1;
                ip->i_d.di_flags2 = 0;
                ip->i_d.di_crtime.t_sec = (__int32_t)tv.tv_sec;
                ip->i_d.di_crtime.t_nsec = (__int32_t)tv.tv_nsec;
diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
index 6367780..3415c63 100644
--- a/fs/xfs/xfs_inode_item.c
+++ b/fs/xfs/xfs_inode_item.c
@@ -364,7 +364,7 @@ xfs_inode_to_log_dinode(
        to->di_flags = from->di_flags;
 
        if (from->di_version == 3) {
-               to->di_changecount = from->di_changecount;
+               to->di_changecount = inode->i_version;
                to->di_crtime.t_sec = from->di_crtime.t_sec;
                to->di_crtime.t_nsec = from->di_crtime.t_nsec;
                to->di_flags2 = from->di_flags2;
diff --git a/fs/xfs/xfs_trans_inode.c b/fs/xfs/xfs_trans_inode.c
index 3f0d466..11a3af0 100644
--- a/fs/xfs/xfs_trans_inode.c
+++ b/fs/xfs/xfs_trans_inode.c
@@ -117,7 +117,7 @@ xfs_trans_log_inode(
         */
        if (!(ip->i_itemp->ili_item.li_desc->lid_flags & XFS_LID_DIRTY) &&
            IS_I_VERSION(VFS_I(ip))) {
-               ip->i_d.di_changecount = ++VFS_I(ip)->i_version;
+               VFS_I(ip)->i_version++;
                flags |= XFS_ILOG_CORE;
        }
 
-- 
2.5.0