Commit 689e11c8 authored by Darrick J. Wong's avatar Darrick J. Wong

xfs: superblock scrub should use short-lived buffers

Secondary superblocks are rarely used, so create a helper to read a
given non-primary AG's superblock and ensure that it won't stick around
hogging memory.
Signed-off-by: default avatarDarrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: default avatarBrian Foster <bfoster@redhat.com>
parent 8389f3ff
......@@ -972,3 +972,25 @@ xfs_fs_geometry(
return 0;
}
/* Read a secondary superblock. */
int
xfs_sb_read_secondary(
struct xfs_mount *mp,
struct xfs_trans *tp,
xfs_agnumber_t agno,
struct xfs_buf **bpp)
{
struct xfs_buf *bp;
int error;
ASSERT(agno != 0 && agno != NULLAGNUMBER);
error = xfs_trans_read_buf(mp, tp, mp->m_ddev_targp,
XFS_AG_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops);
if (error)
return error;
xfs_buf_set_ref(bp, XFS_SSB_REF);
*bpp = bp;
return 0;
}
......@@ -37,5 +37,8 @@ extern void xfs_sb_quota_from_disk(struct xfs_sb *sbp);
#define XFS_FS_GEOM_MAX_STRUCT_VER (4)
extern int xfs_fs_geometry(struct xfs_sb *sbp, struct xfs_fsop_geom *geo,
int struct_version);
extern int xfs_sb_read_secondary(struct xfs_mount *mp,
struct xfs_trans *tp, xfs_agnumber_t agno,
struct xfs_buf **bpp);
#endif /* __XFS_SB_H__ */
......@@ -112,6 +112,7 @@ void xfs_log_get_max_trans_res(struct xfs_mount *mp,
#define XFS_ATTR_BTREE_REF 1
#define XFS_DQUOT_REF 1
#define XFS_REFC_BTREE_REF 1
#define XFS_SSB_REF 0
/*
* Flags for xfs_trans_ichgtime().
......
......@@ -157,9 +157,7 @@ xfs_scrub_superblock(
if (agno == 0)
return 0;
error = xfs_trans_read_buf(mp, sc->tp, mp->m_ddev_targp,
XFS_AGB_TO_DADDR(mp, agno, XFS_SB_BLOCK(mp)),
XFS_FSS_TO_BB(mp, 1), 0, &bp, &xfs_sb_buf_ops);
error = xfs_sb_read_secondary(mp, sc->tp, agno, &bp);
/*
* The superblock verifier can return several different error codes
* if it thinks the superblock doesn't look right. For a mount these
......
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