xfs: track cowblocks separately in i_flags

The EOFBLOCKS/COWBLOCKS tags are totally separate things, so track them
with separate i_flags.  Right now we're abusing IEOFBLOCKS for both,
which is totally bogus because we won't tag the inode with COWBLOCKS if
IEOFBLOCKS was set by a previous tagging of the inode with EOFBLOCKS.
Found by wiring up clonerange to fsstress in xfs/017.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>

2 files changed, 25 insertions, 9 deletions

diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index 43005fbe8b1e..58d2d4253c8e 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -1536,8 +1536,23 @@ xfs_inode_free_quota_eofblocks(
         return __xfs_inode_free_quota_eofblocks(ip, xfs_icache_free_eofblocks);
 }
 
+static inline unsigned long
+xfs_iflag_for_tag(
+        int             tag)
+{
+        switch (tag) {
+        case XFS_ICI_EOFBLOCKS_TAG:
+                return XFS_IEOFBLOCKS;
+        case XFS_ICI_COWBLOCKS_TAG:
+                return XFS_ICOWBLOCKS;
+        default:
+                ASSERT(0);
+                return 0;
+        }
+}
+
 static void
-__xfs_inode_set_eofblocks_tag(
+__xfs_inode_set_blocks_tag(
         xfs_inode_t     *ip,
         void            (*execute)(struct xfs_mount *mp),
         void            (*set_tp)(struct xfs_mount *mp, xfs_agnumber_t agno,
@@ -1552,10 +1567,10 @@ __xfs_inode_set_eofblocks_tag(
          * Don't bother locking the AG and looking up in the radix trees
          * if we already know that we have the tag set.
          */
-        if (ip->i_flags & XFS_IEOFBLOCKS)
+        if (ip->i_flags & xfs_iflag_for_tag(tag))
                 return;
         spin_lock(&ip->i_flags_lock);
-        ip->i_flags |= XFS_IEOFBLOCKS;
+        ip->i_flags |= xfs_iflag_for_tag(tag);
         spin_unlock(&ip->i_flags_lock);
 
         pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
@@ -1587,13 +1602,13 @@ xfs_inode_set_eofblocks_tag(
         xfs_inode_t     *ip)
 {
         trace_xfs_inode_set_eofblocks_tag(ip);
-        return __xfs_inode_set_eofblocks_tag(ip, xfs_queue_eofblocks,
+        return __xfs_inode_set_blocks_tag(ip, xfs_queue_eofblocks,
                         trace_xfs_perag_set_eofblocks,
                         XFS_ICI_EOFBLOCKS_TAG);
 }
 
 static void
-__xfs_inode_clear_eofblocks_tag(
+__xfs_inode_clear_blocks_tag(
         xfs_inode_t     *ip,
         void            (*clear_tp)(struct xfs_mount *mp, xfs_agnumber_t agno,
                                     int error, unsigned long caller_ip),
@@ -1603,7 +1618,7 @@ __xfs_inode_clear_eofblocks_tag(
         struct xfs_perag *pag;
 
         spin_lock(&ip->i_flags_lock);
-        ip->i_flags &= ~XFS_IEOFBLOCKS;
+        ip->i_flags &= ~xfs_iflag_for_tag(tag);
         spin_unlock(&ip->i_flags_lock);
 
         pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
@@ -1630,7 +1645,7 @@ xfs_inode_clear_eofblocks_tag(
         xfs_inode_t     *ip)
 {
         trace_xfs_inode_clear_eofblocks_tag(ip);
-        return __xfs_inode_clear_eofblocks_tag(ip,
+        return __xfs_inode_clear_blocks_tag(ip,
                         trace_xfs_perag_clear_eofblocks, XFS_ICI_EOFBLOCKS_TAG);
 }
 
@@ -1724,7 +1739,7 @@ xfs_inode_set_cowblocks_tag(
         xfs_inode_t     *ip)
 {
         trace_xfs_inode_set_cowblocks_tag(ip);
-        return __xfs_inode_set_eofblocks_tag(ip, xfs_queue_cowblocks,
+        return __xfs_inode_set_blocks_tag(ip, xfs_queue_cowblocks,
                         trace_xfs_perag_set_cowblocks,
                         XFS_ICI_COWBLOCKS_TAG);
 }
@@ -1734,6 +1749,6 @@ xfs_inode_clear_cowblocks_tag(
         xfs_inode_t     *ip)
 {
         trace_xfs_inode_clear_cowblocks_tag(ip);
-        return __xfs_inode_clear_eofblocks_tag(ip,
+        return __xfs_inode_clear_blocks_tag(ip,
                         trace_xfs_perag_clear_cowblocks, XFS_ICI_COWBLOCKS_TAG);
 }
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index b2136af9289f..d383e392ec9d 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -232,6 +232,7 @@ static inline bool xfs_is_reflink_inode(struct xfs_inode *ip)
  * log recovery to replay a bmap operation on the inode.
  */
 #define XFS_IRECOVERY           (1 << 11)
+#define XFS_ICOWBLOCKS          (1 << 12)/* has the cowblocks tag set */
 
 /*
  * Per-lifetime flags need to be reset when re-using a reclaimable inode during