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| author | Darrick J. Wong <darrick.wong@oracle.com> | 2018-05-14 06:34:31 -0700 |
|---|---|---|
| committer | Darrick J. Wong <darrick.wong@oracle.com> | 2018-05-15 17:57:05 -0700 |
| commit | 689e11c84b15866619e7582486acacaf79d7e3e2 (patch) | |
| tree | 9d27a9b8ed45ea0603bd7f7bd205d2d4855d178c /fs/xfs/libxfs/xfs_sb.c | |
| parent | 8389f3ffa22a119b37dc7c2217cd2862bb2ed9da (diff) | |
| download | lwn-689e11c84b15866619e7582486acacaf79d7e3e2.tar.gz lwn-689e11c84b15866619e7582486acacaf79d7e3e2.zip | |
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: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Brian Foster <bfoster@redhat.com>
Diffstat (limited to 'fs/xfs/libxfs/xfs_sb.c')
| -rw-r--r-- | fs/xfs/libxfs/xfs_sb.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/fs/xfs/libxfs/xfs_sb.c b/fs/xfs/libxfs/xfs_sb.c index d9b94bd5f689..d9bef41a3f26 100644 --- a/fs/xfs/libxfs/xfs_sb.c +++ b/fs/xfs/libxfs/xfs_sb.c @@ -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; +} |