[PATCH v3 10/14] xfs: Do not free EOF blocks for forcealign

[John Garry <john.g.garry@oracle.com>]

For when forcealign is enabled, we want the EOF to be aligned as well, so
do not free EOF blocks.

Reviewed-by: "Darrick J. Wong" <djwong@kernel.org> #earlier version
Signed-off-by: John Garry <john.g.garry@oracle.com>
---
 fs/xfs/xfs_bmap_util.c |  7 +++++--
 fs/xfs/xfs_inode.c     | 14 ++++++++++++++
 fs/xfs/xfs_inode.h     |  2 ++
 3 files changed, 21 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index fe2e2c930975..60389ac8bd45 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -496,6 +496,7 @@ xfs_can_free_eofblocks(
 	struct xfs_mount	*mp = ip->i_mount;
 	xfs_fileoff_t		end_fsb;
 	xfs_fileoff_t		last_fsb;
+	xfs_fileoff_t		dummy_fsb;
 	int			nimaps = 1;
 	int			error;
 
@@ -537,8 +538,10 @@ xfs_can_free_eofblocks(
 	 * forever.
 	 */
 	end_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)XFS_ISIZE(ip));
-	if (xfs_inode_has_bigrtalloc(ip))
-		end_fsb = xfs_rtb_roundup_rtx(mp, end_fsb);
+
+	/* Only try to free beyond the allocation unit that crosses EOF */
+	xfs_roundout_to_alloc_fsbsize(ip, &dummy_fsb, &end_fsb);
+
 	last_fsb = XFS_B_TO_FSB(mp, mp->m_super->s_maxbytes);
 	if (last_fsb <= end_fsb)
 		return false;
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 5af12f35062d..d765dedebc15 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -3129,6 +3129,20 @@ xfs_inode_alloc_unitsize(
 	return XFS_FSB_TO_B(ip->i_mount, xfs_inode_alloc_fsbsize(ip));
 }
 
+void
+xfs_roundout_to_alloc_fsbsize(
+	struct xfs_inode	*ip,
+	xfs_fileoff_t		*start,
+	xfs_fileoff_t		*end)
+{
+	unsigned int		blocks = xfs_inode_alloc_fsbsize(ip);
+
+	if (blocks == 1)
+		return;
+	*start = rounddown_64(*start, blocks);
+	*end = roundup_64(*end, blocks);
+}
+
 /* Should we always be using copy on write for file writes? */
 bool
 xfs_is_always_cow_inode(
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index 158afad8c7a4..7f86c4781bd8 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -643,6 +643,8 @@ void xfs_inode_count_blocks(struct xfs_trans *tp, struct xfs_inode *ip,
 		xfs_filblks_t *dblocks, xfs_filblks_t *rblocks);
 unsigned int xfs_inode_alloc_fsbsize(struct xfs_inode *ip);
 unsigned int xfs_inode_alloc_unitsize(struct xfs_inode *ip);
+void xfs_roundout_to_alloc_fsbsize(struct xfs_inode *ip,
+		xfs_fileoff_t *start, xfs_fileoff_t *end);
 
 int xfs_icreate_dqalloc(const struct xfs_icreate_args *args,
 		struct xfs_dquot **udqpp, struct xfs_dquot **gdqpp,
-- 
2.31.1