[PATCH 35/58] xfs: refcount btree add more reserved blocks

Darrick J. Wong
2015-10-07T04:59:03Z

Since XFS reserves a small amount of space in each AG as the minimum
free space needed for an operation, save some more space in case we
touch the refcount btree.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
fs/xfs/libxfs/xfs_alloc.c | 13 +++++++++++++
fs/xfs/libxfs/xfs_format.h | 2 ++
2 files changed, 15 insertions(+)

diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
index 6e7f0a6..bd8aa8c 100644
--- a/fs/xfs/libxfs/xfs_alloc.c
+++ b/fs/xfs/libxfs/xfs_alloc.c
@@ -50,10 +50,23 @@ STATIC int xfs_alloc_ag_vextent_size(xfs_alloc_arg_t *);
STATIC int xfs_alloc_ag_vextent_small(xfs_alloc_arg_t *,
xfs_btree_cur_t *, xfs_agblock_t *, xfs_extlen_t *, int *);

+unsigned int
+xfs_refc_block(
+ struct xfs_mount *mp)
+{
+ if (xfs_sb_version_hasrmapbt(&mp->m_sb))
+ return XFS_RMAP_BLOCK(mp) + 1;
+ if (xfs_sb_version_hasfinobt(&mp->m_sb))
+ return XFS_FIBT_BLOCK(mp) + 1;
+ return XFS_IBT_BLOCK(mp) + 1;
+}
+
xfs_extlen_t
xfs_prealloc_blocks(
struct xfs_mount *mp)
{
+ if (xfs_sb_version_hasreflink(&mp->m_sb))
+ return xfs_refc_block(mp) + 1;
if (xfs_sb_version_hasrmapbt(&mp->m_sb))
return XFS_RMAP_BLOCK(mp) + 1;
if (xfs_sb_version_hasfinobt(&mp->m_sb))
diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index 600b327..5757440 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -1499,6 +1499,8 @@ xfs_owner_info_pack(
*/
#define XFS_REFC_CRC_MAGIC 0x52334643 /* 'R3FC' */

+unsigned int xfs_refc_block(struct xfs_mount *mp);
+

/*
* BMAP Btree format definitions