@@ -22,5 +22,4 @@ extern void xfs_diflags_to_iflags(struct xfs_inode *ip, bool init);
void xfs_get_atomic_write_attr(struct xfs_inode *ip,
unsigned int *unit_min, unsigned int *unit_max);
-
No need to remove a blank line.
ok
#endif /* __XFS_IOPS_H__ */
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 477c5262cf91..af3ed135be4d 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -651,6 +651,32 @@ xfs_agbtree_compute_maxlevels(
levels = max(levels, mp->m_rmap_maxlevels);
mp->m_agbtree_maxlevels = max(levels, mp->m_refc_maxlevels);
}
+static inline void
+xfs_compute_awu_max(
+ struct xfs_mount *mp)
+{
+ xfs_agblock_t agsize = mp->m_sb.sb_agblocks;
+ xfs_agblock_t awu_max;
+
+ if (!xfs_has_reflink(mp)) {
+ mp->awu_max = 1;
+ return;
+ }
+
+ /*
+ * Find highest power-of-2 evenly divisible into agsize and which
+ * also fits into an unsigned int field.
+ */
+ awu_max = 1;
+ while (1) {
+ if (agsize % (awu_max * 2))
+ break;
+ if (XFS_FSB_TO_B(mp, awu_max * 2) > UINT_MAX)
+ break;
+ awu_max *= 2;
+ }
+ mp->awu_max = awu_max;
+}
/* Compute maximum possible height for realtime btree types for this fs. */
static inline void
@@ -736,6 +762,8 @@ xfs_mountfs(
xfs_agbtree_compute_maxlevels(mp);
xfs_rtbtree_compute_maxlevels(mp);
+ xfs_compute_awu_max(mp);
+
/*
* Check if sb_agblocks is aligned at stripe boundary. If sb_agblocks
* is NOT aligned turn off m_dalign since allocator alignment is within
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index fbed172d6770..34286c87ac4a 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -198,6 +198,7 @@ typedef struct xfs_mount {
bool m_fail_unmount;
bool m_finobt_nores; /* no per-AG finobt resv. */
bool m_update_sb; /* sb needs update in mount */
+ xfs_extlen_t awu_max; /* max atomic write */
Might want to clarify that this is for the *data* device.
sure
/* max atomic write to datadev */
With those two things fixed,
Reviewed-by: "Darrick J. Wong" <djwong@xxxxxxxxxx>
cheers
