[PATCH 09/13] xfs_scrub: fix per-thread counter error communication problems

["Darrick J. Wong" <darrick.wong@oracle.com>]

From: Darrick J. Wong <darrick.wong@oracle.com>

Fix all the places in the per-thread counter functions either we fail to
check for runtime errors or fail to communicate them properly to
callers.  Then fix all the callers to report the error messages instead
of hiding them.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 scrub/counter.c     |   33 ++++++++++++++++++---------------
 scrub/counter.h     |    6 +++---
 scrub/phase3.c      |   23 +++++++++++++++++------
 scrub/progress.c    |   12 +++++++++---
 scrub/read_verify.c |    9 ++++++---
 5 files changed, 53 insertions(+), 30 deletions(-)


diff --git a/scrub/counter.c b/scrub/counter.c
index 49ffbfea..1bb726dc 100644
--- a/scrub/counter.c
+++ b/scrub/counter.c
@@ -26,23 +26,25 @@ struct ptcounter {
 	struct ptvar	*var;
 };
 
-/* Initialize per-thread counter. */
-struct ptcounter *
-ptcounter_init(
-	size_t			nr)
+/* Allocate per-thread counter. */
+int
+ptcounter_alloc(
+	size_t			nr,
+	struct ptcounter	**pp)
 {
 	struct ptcounter	*p;
 	int			ret;
 
 	p = malloc(sizeof(struct ptcounter));
 	if (!p)
-		return NULL;
+		return errno;
 	ret = ptvar_alloc(nr, sizeof(uint64_t), &p->var);
 	if (ret) {
 		free(p);
-		return NULL;
+		return ret;
 	}
-	return p;
+	*pp = p;
+	return 0;
 }
 
 /* Free per-thread counter. */
@@ -55,7 +57,7 @@ ptcounter_free(
 }
 
 /* Add a quantity to the counter. */
-void
+int
 ptcounter_add(
 	struct ptcounter	*ptc,
 	int64_t			nr)
@@ -64,8 +66,10 @@ ptcounter_add(
 	int			ret;
 
 	p = ptvar_get(ptc->var, &ret);
-	assert(ret == 0);
+	if (ret)
+		return ret;
 	*p += nr;
+	return 0;
 }
 
 static int
@@ -82,12 +86,11 @@ ptcounter_val_helper(
 }
 
 /* Return the approximate value of this counter. */
-uint64_t
+int
 ptcounter_value(
-	struct ptcounter	*ptc)
+	struct ptcounter	*ptc,
+	uint64_t		*sum)
 {
-	uint64_t		sum = 0;
-
-	ptvar_foreach(ptc->var, ptcounter_val_helper, &sum);
-	return sum;
+	*sum = 0;
+	return ptvar_foreach(ptc->var, ptcounter_val_helper, sum);
 }
diff --git a/scrub/counter.h b/scrub/counter.h
index 6c501b85..01b65056 100644
--- a/scrub/counter.h
+++ b/scrub/counter.h
@@ -7,9 +7,9 @@
 #define XFS_SCRUB_COUNTER_H_
 
 struct ptcounter;
-struct ptcounter *ptcounter_init(size_t nr);
+int ptcounter_alloc(size_t nr, struct ptcounter **pp);
 void ptcounter_free(struct ptcounter *ptc);
-void ptcounter_add(struct ptcounter *ptc, int64_t nr);
-uint64_t ptcounter_value(struct ptcounter *ptc);
+int ptcounter_add(struct ptcounter *ptc, int64_t nr);
+int ptcounter_value(struct ptcounter *ptc, uint64_t *sum);
 
 #endif /* XFS_SCRUB_COUNTER_H_ */
diff --git a/scrub/phase3.c b/scrub/phase3.c
index a32d1ced..1e908c2c 100644
--- a/scrub/phase3.c
+++ b/scrub/phase3.c
@@ -139,7 +139,12 @@ xfs_scrub_inode(
 		goto out;
 
 out:
-	ptcounter_add(icount, 1);
+	error = ptcounter_add(icount, 1);
+	if (error) {
+		str_liberror(ctx, error,
+				_("incrementing scanned inode counter"));
+		return false;
+	}
 	progress_add(1);
 	xfs_action_list_defer(ctx, agno, &alist);
 	if (fd >= 0) {
@@ -158,12 +163,14 @@ xfs_scan_inodes(
 	struct scrub_ctx	*ctx)
 {
 	struct scrub_inode_ctx	ictx;
+	uint64_t		val;
+	int			err;
 	bool			ret;
 
 	ictx.moveon = true;
-	ictx.icount = ptcounter_init(scrub_nproc(ctx));
-	if (!ictx.icount) {
-		str_info(ctx, ctx->mntpoint, _("Could not create counter."));
+	err = ptcounter_alloc(scrub_nproc(ctx), &ictx.icount);
+	if (err) {
+		str_liberror(ctx, err, _("creating scanned inode counter"));
 		return false;
 	}
 
@@ -173,8 +180,12 @@ xfs_scan_inodes(
 	if (!ictx.moveon)
 		goto free;
 	xfs_scrub_report_preen_triggers(ctx);
-	ctx->inodes_checked = ptcounter_value(ictx.icount);
-
+	err = ptcounter_value(ictx.icount, &val);
+	if (err) {
+		str_liberror(ctx, err, _("summing scanned inode counter"));
+		return false;
+	}
+	ctx->inodes_checked = val;
 free:
 	ptcounter_free(ictx.icount);
 	return ictx.moveon;
diff --git a/scrub/progress.c b/scrub/progress.c
index c9a9d286..08c7233e 100644
--- a/scrub/progress.c
+++ b/scrub/progress.c
@@ -119,6 +119,8 @@ progress_report_thread(void *arg)
 
 	pthread_mutex_lock(&pt.lock);
 	while (1) {
+		uint64_t	progress_val;
+
 		/* Every half second. */
 		ret = clock_gettime(CLOCK_REALTIME, &abstime);
 		if (ret)
@@ -131,7 +133,9 @@ progress_report_thread(void *arg)
 		pthread_cond_timedwait(&pt.wakeup, &pt.lock, &abstime);
 		if (pt.terminate)
 			break;
-		progress_report(ptcounter_value(pt.ptc));
+		ret = ptcounter_value(pt.ptc, &progress_val);
+		if (!ret)
+			progress_report(progress_val);
 	}
 	pthread_mutex_unlock(&pt.lock);
 	return NULL;
@@ -187,9 +191,11 @@ progress_init_phase(
 	pt.twiddle = 0;
 	pt.terminate = false;
 
-	pt.ptc = ptcounter_init(nr_threads);
-	if (!pt.ptc)
+	ret = ptcounter_alloc(nr_threads, &pt.ptc);
+	if (ret) {
+		str_liberror(ctx, ret, _("allocating progress counter"));
 		goto out_max;
+	}
 
 	ret = pthread_create(&pt.thread, NULL, progress_report_thread, NULL);
 	if (ret)
diff --git a/scrub/read_verify.c b/scrub/read_verify.c
index 95987a9b..b890c92f 100644
--- a/scrub/read_verify.c
+++ b/scrub/read_verify.c
@@ -84,8 +84,8 @@ read_verify_pool_init(
 			RVP_IO_MAX_SIZE);
 	if (error || !rvp->readbuf)
 		goto out_free;
-	rvp->verified_bytes = ptcounter_init(nproc);
-	if (!rvp->verified_bytes)
+	error = ptcounter_alloc(nproc, &rvp->verified_bytes);
+	if (error)
 		goto out_buf;
 	rvp->miniosz = miniosz;
 	rvp->ctx = ctx;
@@ -282,5 +282,8 @@ uint64_t
 read_verify_bytes(
 	struct read_verify_pool		*rvp)
 {
-	return ptcounter_value(rvp->verified_bytes);
+	uint64_t			ret;
+
+	ptcounter_value(rvp->verified_bytes, &ret);
+	return ret;
 }