[PATCH 2/3] xfs_scrub: perform media scans of entire devices

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

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

Add a new feature to xfs_scrub where specifying multiple -x will cause
it to perform a media scan of the entire disk, not just the file data
areas.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
 man/man8/xfs_scrub.8 |    3 +++
 scrub/phase6.c       |   60 ++++++++++++++++++++++++++++++++++++++++++++++----
 scrub/phase7.c       |    5 ++++
 scrub/xfs_scrub.c    |    4 ++-
 scrub/xfs_scrub.h    |    1 +
 5 files changed, 66 insertions(+), 7 deletions(-)


diff --git a/man/man8/xfs_scrub.8 b/man/man8/xfs_scrub.8
index 18948a4e..872a088c 100644
--- a/man/man8/xfs_scrub.8
+++ b/man/man8/xfs_scrub.8
@@ -97,6 +97,9 @@ Prints the version number and exits.
 .TP
 .B \-x
 Read all file data extents to look for disk errors.
+If this option is given more than once, scrub all disk contents.
+If this option is given more than twice, report errors even if they have not
+yet caused data loss.
 .B xfs_scrub
 will issue O_DIRECT reads to the block device directly.
 If the block device is a SCSI disk, it will instead issue READ VERIFY commands
diff --git a/scrub/phase6.c b/scrub/phase6.c
index c50fb8fb..7bfb856a 100644
--- a/scrub/phase6.c
+++ b/scrub/phase6.c
@@ -167,7 +167,9 @@ report_data_loss(
 	int				ret;
 
 	/* Only report errors for real extents. */
-	if (bmap->bm_flags & (BMV_OF_PREALLOC | BMV_OF_DELALLOC))
+	if (scrub_data < 3 && (bmap->bm_flags & BMV_OF_PREALLOC))
+		return true;
+	if (bmap->bm_flags & BMV_OF_DELALLOC)
 		return true;
 
 	if (fsx->fsx_xflags & FS_XFLAG_REALTIME)
@@ -355,7 +357,7 @@ ioerr_fsmap_report(
 	uint64_t		err_off;
 
 	/* Don't care about unwritten extents. */
-	if (map->fmr_flags & FMR_OF_PREALLOC)
+	if (scrub_data < 3 && (map->fmr_flags & FMR_OF_PREALLOC))
 		return true;
 
 	if (err_physical > map->fmr_physical)
@@ -602,6 +604,49 @@ clean_pool(
 	return ret;
 }
 
+/* Schedule an entire disk for read verification. */
+static int
+verify_entire_disk(
+	struct read_verify_pool		*rvp,
+	struct disk			*disk,
+	struct media_verify_state	*vs)
+{
+	return read_verify_schedule_io(rvp, 0, disk->d_size, vs);
+}
+
+/* Scan every part of every disk. */
+static bool
+verify_all_disks(
+	struct scrub_ctx		*ctx,
+	struct media_verify_state	*vs)
+{
+	int				ret;
+
+	ret = verify_entire_disk(vs->rvp_data, ctx->datadev, vs);
+	if (ret) {
+		str_liberror(ctx, ret, _("scheduling datadev verify"));
+		return false;
+	}
+
+	if (ctx->logdev) {
+		ret = verify_entire_disk(vs->rvp_log, ctx->logdev, vs);
+		if (ret) {
+			str_liberror(ctx, ret, _("scheduling logdev verify"));
+			return false;
+		}
+	}
+
+	if (ctx->rtdev) {
+		ret = verify_entire_disk(vs->rvp_realtime, ctx->rtdev, vs);
+		if (ret) {
+			str_liberror(ctx, ret, _("scheduling rtdev verify"));
+			return false;
+		}
+	}
+
+	return true;
+}
+
 /*
  * Read verify all the file data blocks in a filesystem.  Since XFS doesn't
  * do data checksums, we trust that the underlying storage will pass back
@@ -657,7 +702,11 @@ xfs_scan_blocks(
 			goto out_logpool;
 		}
 	}
-	moveon = xfs_scan_all_spacemaps(ctx, xfs_check_rmap, &vs);
+
+	if (scrub_data > 1)
+		moveon = verify_all_disks(ctx, &vs);
+	else
+		moveon = xfs_scan_all_spacemaps(ctx, xfs_check_rmap, &vs);
 	if (!moveon)
 		goto out_rtpool;
 
@@ -729,8 +778,9 @@ xfs_estimate_verify_work(
 	if (!moveon)
 		return moveon;
 
-	*items = cvt_off_fsb_to_b(&ctx->mnt,
-			(d_blocks - d_bfree) + (r_blocks - r_bfree));
+	*items = cvt_off_fsb_to_b(&ctx->mnt, d_blocks + r_blocks);
+	if (scrub_data == 1)
+		*items -= cvt_off_fsb_to_b(&ctx->mnt, d_bfree + r_bfree);
 	*nr_threads = disk_heads(ctx->datadev);
 	*rshift = 20;
 	return moveon;
diff --git a/scrub/phase7.c b/scrub/phase7.c
index bc959f5b..570ceb3f 100644
--- a/scrub/phase7.c
+++ b/scrub/phase7.c
@@ -255,6 +255,11 @@ _("%.*f%s inodes counted; %.*f%s inodes checked.\n"),
 		double		b1, b2;
 		char		*b1u, *b2u;
 
+		if (scrub_data > 1) {
+			used_data = cvt_off_fsb_to_b(&ctx->mnt, d_blocks);
+			used_rt = cvt_off_fsb_to_b(&ctx->mnt, r_blocks);
+		}
+
 		b1 = auto_space_units(used_data + used_rt, &b1u);
 		b2 = auto_space_units(ctx->bytes_checked, &b2u);
 		fprintf(stdout,
diff --git a/scrub/xfs_scrub.c b/scrub/xfs_scrub.c
index 2d554340..46876522 100644
--- a/scrub/xfs_scrub.c
+++ b/scrub/xfs_scrub.c
@@ -139,7 +139,7 @@ unsigned int			force_nr_threads;
 bool				verbose;
 
 /* Should we scrub the data blocks? */
-static bool			scrub_data;
+int				scrub_data;
 
 /* Size of a memory page. */
 long				page_size;
@@ -666,7 +666,7 @@ main(
 			fflush(stdout);
 			return SCRUB_RET_SUCCESS;
 		case 'x':
-			scrub_data = true;
+			scrub_data++;
 			break;
 		case '?':
 			/* fall through */
diff --git a/scrub/xfs_scrub.h b/scrub/xfs_scrub.h
index 54876acb..6558bad7 100644
--- a/scrub/xfs_scrub.h
+++ b/scrub/xfs_scrub.h
@@ -21,6 +21,7 @@ extern bool			want_fstrim;
 extern bool			stderr_isatty;
 extern bool			stdout_isatty;
 extern bool			is_service;
+extern int			scrub_data;
 
 enum scrub_mode {
 	SCRUB_MODE_DRY_RUN,