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[XFS] factor out xfs_read_agf helper

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Add a helper to read the AGF header and perform basic verification.
Based on hunks from a larger patch from Dave Chinner.

(First sent on Juli 23rd)

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <david@fromorbit.com>
Signed-off-by: Niv Sardi <xaiki@sgi.com>
This commit is contained in:
From: Christoph Hellwig
2008-11-28 14:23:38 +11:00
committed by Niv Sardi
parent 5e1be0fb1a
commit 4805621a37
3 changed files with 61 additions and 36 deletions
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26
fs/xfs/xfs_log_recover.c
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@@ -3970,7 +3970,6 @@ xlog_recover_check_summary(
xfs_agf_t *agfp;
xfs_buf_t *agfbp;
xfs_buf_t *agibp;
xfs_daddr_t agfdaddr;
xfs_buf_t *sbbp;
#ifdef XFS_LOUD_RECOVERY
xfs_sb_t *sbp;
@@ -3987,21 +3986,18 @@ xlog_recover_check_summary(
itotal = 0LL;
ifree = 0LL;
for (agno = 0; agno < mp->m_sb.sb_agcount; agno++) {
agfdaddr = XFS_AG_DADDR(mp, agno, XFS_AGF_DADDR(mp));
agfbp = xfs_buf_read(mp->m_ddev_targp, agfdaddr,
XFS_FSS_TO_BB(mp, 1), 0);
if (XFS_BUF_ISERROR(agfbp)) {
xfs_ioerror_alert("xlog_recover_check_summary(agf)",
mp, agfbp, agfdaddr);
error = xfs_read_agf(mp, NULL, agno, 0, &agfbp);
if (error) {
xfs_fs_cmn_err(CE_ALERT, mp,
"xlog_recover_check_summary(agf)"
"agf read failed agno %d error %d",
agno, error);
} else {
agfp = XFS_BUF_TO_AGF(agfbp);
freeblks += be32_to_cpu(agfp->agf_freeblks) +
be32_to_cpu(agfp->agf_flcount);
xfs_buf_relse(agfbp);
}
agfp = XFS_BUF_TO_AGF(agfbp);
ASSERT(XFS_AGF_MAGIC == be32_to_cpu(agfp->agf_magicnum));
ASSERT(XFS_AGF_GOOD_VERSION(be32_to_cpu(agfp->agf_versionnum)));
ASSERT(be32_to_cpu(agfp->agf_seqno) == agno);
freeblks += be32_to_cpu(agfp->agf_freeblks) +
be32_to_cpu(agfp->agf_flcount);
xfs_buf_relse(agfbp);
error = xfs_read_agi(mp, NULL, agno, &agibp);
if (!error) {