[PATCH 2/4] xfsprogs: add xlog_is_empty() helper

[Eric Sandeen <sandeen@sandeen.net>]

xfs_repair and xfs_db both check for a dirty log, using roughly
the same cut and pasted code.

Add a new helper to do this, xlog_is_dirty(), and use it instead.

Note, the helper (and the code before it) is a little odd in that
it (re-)initializes some libxfs_init_t members before proceeding,
I haven't yet worked out if that's necessary or correct, so I've
just kept the same behavior for now.  Still, it seems like this
should be done in libxfs_init, or not at all.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
---
 db/sb.c           |   21 ++++---------------
 include/libxlog.h |    2 +
 libxlog/util.c    |   56 +++++++++++++++++++++++++++++++++++++++++++++++++++++
 repair/phase2.c   |   55 +++++++++++----------------------------------------
 4 files changed, 75 insertions(+), 59 deletions(-)

diff --git a/db/sb.c b/db/sb.c
index 991478d..f9d39e6 100644
--- a/db/sb.c
+++ b/db/sb.c
@@ -225,8 +225,7 @@ int xlog_recover_do_trans(struct xlog *log, xlog_recover_t *t, int p)
 int
 sb_logcheck(void)
 {
-	struct xlog	log;
-	xfs_daddr_t	head_blk, tail_blk;
+	int		dirty;
 
 	if (mp->m_sb.sb_logstart) {
 		if (x.logdev && x.logdev != x.ddev) {
@@ -242,25 +241,14 @@ sb_logcheck(void)
 		}
 	}
 
-	memset(&log, 0, sizeof(log));
 	libxfs_buftarg_init(mp, x.ddev, x.logdev, x.rtdev);
-	x.logBBsize = XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
-	x.logBBstart = XFS_FSB_TO_DADDR(mp, mp->m_sb.sb_logstart);
-	x.lbsize = BBSIZE;
-	if (xfs_sb_version_hassector(&mp->m_sb))
-		x.lbsize <<= (mp->m_sb.sb_logsectlog - BBSHIFT);
-
-	log.l_dev = mp->m_logdev_targp;
-	log.l_logBBsize = x.logBBsize;
-	log.l_logBBstart = x.logBBstart;
-	log.l_sectBBsize  = BTOBB(x.lbsize);
-	log.l_mp = mp;
-
-	if (xlog_find_tail(&log, &head_blk, &tail_blk)) {
+
+	dirty = xlog_is_dirty(mp, &x, 0);
+
+	if (dirty == -1) {
 		dbprintf(_("ERROR: cannot find log head/tail, run xfs_repair\n"));
 		return 0;
-	}
-	if (head_blk != tail_blk) {
+	} else if (dirty == 1) {
 		dbprintf(_(
 "ERROR: The filesystem has valuable metadata changes in a log which needs to\n"
 "be replayed.  Mount the filesystem to replay the log, and unmount it before\n"
@@ -270,6 +258,7 @@ sb_logcheck(void)
 "of the filesystem before doing this.\n"), progname);
 		return 0;
 	}
+	/* Log is clean */
 	return 1;
 }
 
diff --git a/include/libxlog.h b/include/libxlog.h
index e6d915c..c6640a8 100644
--- a/include/libxlog.h
+++ b/include/libxlog.h
@@ -83,6 +83,8 @@ extern int	print_record_header;
 /* libxfs parameters */
 extern libxfs_init_t	x;
 
+
+extern int xlog_is_dirty(xfs_mount_t *mp, libxfs_init_t *x, int verbose);
 extern struct xfs_buf *xlog_get_bp(struct xlog *, int);
 extern void	xlog_put_bp(struct xfs_buf *);
 extern int	xlog_bread(struct xlog *log, xfs_daddr_t blk_no, int nbblks,
diff --git a/libxlog/util.c b/libxlog/util.c
index 053cf04..498c06c 100644
--- a/libxlog/util.c
+++ b/libxlog/util.c
@@ -24,6 +24,62 @@ int print_skip_uuid;
 int print_record_header;
 libxfs_init_t x;
 
+/*
+ * Return 1 for dirty, 0 for clean, -1 for errors
+ */
+int
+xlog_is_dirty(
+	xfs_mount_t *mp,
+	libxfs_init_t *x,
+	int verbose)
+{
+	int error;
+	struct xlog	log;
+	xfs_daddr_t head_blk, tail_blk;
+
+	memset(&log, 0, sizeof(log));
+
+	/* We (re-)init members of libxfs_init_t here?  really? */
+	x->logBBsize = XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
+	x->logBBstart = XFS_FSB_TO_DADDR(mp, mp->m_sb.sb_logstart);
+	x->lbsize = BBSIZE;
+	if (xfs_sb_version_hassector(&mp->m_sb))
+		x->lbsize <<= (mp->m_sb.sb_logsectlog - BBSHIFT);
+
+	log.l_dev = mp->m_logdev_targp;
+	log.l_logBBsize = x->logBBsize;
+	log.l_logBBstart = x->logBBstart;
+	log.l_sectBBsize = BTOBB(x->lbsize);
+	log.l_mp = mp;
+	if (xfs_sb_version_hassector(&mp->m_sb)) {
+		log.l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT;
+		ASSERT(log.l_sectbb_log <= mp->m_sectbb_log);
+		/* for larger sector sizes, must have v2 or external log */
+		ASSERT(log.l_sectbb_log == 0 ||
+			log.l_logBBstart == 0 ||
+			xfs_sb_version_haslogv2(&mp->m_sb));
+		ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT);
+	}
+	log.l_sectbb_mask = (1 << log.l_sectbb_log) - 1;
+
+	if ((error = xlog_find_tail(&log, &head_blk, &tail_blk))) {
+		xlog_warn(_("%s: cannot find log head/tail "
+			  "(xlog_find_tail=%d)\n"),
+			__func__, error);
+		return -1;
+	}
+
+	if (verbose)
+		xlog_warn(
+	_("%s: head block %" PRId64 " tail block %" PRId64 "\n"),
+			__func__, head_blk, tail_blk);
+
+	if (head_blk != tail_blk)
+		return 1;
+
+	return 0;
+}
+
 static int
 header_check_uuid(xfs_mount_t *mp, xlog_rec_header_t *head)
 {
diff --git a/repair/phase2.c b/repair/phase2.c
index 983aaa7..a23f472 100644
--- a/repair/phase2.c
+++ b/repair/phase2.c
@@ -38,62 +38,31 @@ int xlog_recover_do_trans(struct xlog *log, xlog_recover_t *t, int p)
 static void
 zero_log(xfs_mount_t *mp)
 {
-	int error;
-	struct xlog	log;
-	xfs_daddr_t head_blk, tail_blk;
-
-	memset(&log, 0, sizeof(log));
-	x.logBBsize = XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
-	x.logBBstart = XFS_FSB_TO_DADDR(mp, mp->m_sb.sb_logstart);
-	x.lbsize = BBSIZE;
-	if (xfs_sb_version_hassector(&mp->m_sb))
-		x.lbsize <<= (mp->m_sb.sb_logsectlog - BBSHIFT);
-
-	log.l_dev = mp->m_logdev_targp;
-	log.l_logBBsize = x.logBBsize;
-	log.l_logBBstart = x.logBBstart;
-	log.l_sectBBsize  = BTOBB(x.lbsize);
-	log.l_mp = mp;
-	if (xfs_sb_version_hassector(&mp->m_sb)) {
-		log.l_sectbb_log = mp->m_sb.sb_logsectlog - BBSHIFT;
-		ASSERT(log.l_sectbb_log <= mp->m_sectbb_log);
-		/* for larger sector sizes, must have v2 or external log */
-		ASSERT(log.l_sectbb_log == 0 ||
-			log.l_logBBstart == 0 ||
-			xfs_sb_version_haslogv2(&mp->m_sb));
-		ASSERT(mp->m_sb.sb_logsectlog >= BBSHIFT);
-	}
-	log.l_sectbb_mask = (1 << log.l_sectbb_log) - 1;
-
-	if ((error = xlog_find_tail(&log, &head_blk, &tail_blk))) {
-		do_warn(_("zero_log: cannot find log head/tail "
-			  "(xlog_find_tail=%d), zeroing it anyway\n"),
-			error);
-	} else {
-		if (verbose) {
-			do_warn(
-	_("zero_log: head block %" PRId64 " tail block %" PRId64 "\n"),
-				head_blk, tail_blk);
-		}
-		if (head_blk != tail_blk) {
-			if (zap_log) {
-				do_warn(_(
+	int		dirty;
+
+	dirty = xlog_is_dirty(mp, &x, verbose);
+
+	if (dirty == -1)
+		do_warn(_("zero_log: cannot find log head/tail, "
+			  "zeroing it anyway\n"));
+	else if (dirty == 1) {
+		if (zap_log) {
+			do_warn(_(
 "ALERT: The filesystem has valuable metadata changes in a log which is being\n"
 "destroyed because the -L option was used.\n"));
-			} else {
-				do_warn(_(
+		} else {
+			do_warn(_(
 "ERROR: The filesystem has valuable metadata changes in a log which needs to\n"
 "be replayed.  Mount the filesystem to replay the log, and unmount it before\n"
 "re-running xfs_repair.  If you are unable to mount the filesystem, then use\n"
 "the -L option to destroy the log and attempt a repair.\n"
 "Note that destroying the log may cause corruption -- please attempt a mount\n"
 "of the filesystem before doing this.\n"));
-				exit(2);
-			}
+			exit(2);
 		}
 	}
 
-	libxfs_log_clear(log.l_dev,
+	libxfs_log_clear(mp->m_logdev_targp,
 		XFS_FSB_TO_DADDR(mp, mp->m_sb.sb_logstart),
 		(xfs_extlen_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks),
 		&mp->m_sb.sb_uuid,
-- 1.7.1

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