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From: Dave Chinner <david@fromorbit.com>
To: xfs@oss.sgi.com
Subject: [PATCH 10/18] xfs: use unhashed buffers for size checks
Date: Fri, 24 Sep 2010 22:31:08 +1000	[thread overview]
Message-ID: <1285331476-23015-11-git-send-email-david@fromorbit.com> (raw)
In-Reply-To: <1285331476-23015-1-git-send-email-david@fromorbit.com>

From: Dave Chinner <dchinner@redhat.com>

When we are checking we can access the last block of each device, we
do not need to use cached buffers as they will be tossed away
immediately. Use uncached buffers for size checks so that all IO
prior to full in-memory structure initialisation does not use the
buffer cache.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
---
 fs/xfs/xfs_fsops.c   |   11 +++++------
 fs/xfs/xfs_mount.c   |   39 ++++++++++++++++-----------------------
 fs/xfs/xfs_rtalloc.c |   29 +++++++++++++----------------
 3 files changed, 34 insertions(+), 45 deletions(-)

diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index 43b1d56..6a1edb1 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -144,12 +144,11 @@ xfs_growfs_data_private(
 	if ((error = xfs_sb_validate_fsb_count(&mp->m_sb, nb)))
 		return error;
 	dpct = pct - mp->m_sb.sb_imax_pct;
-	error = xfs_read_buf(mp, mp->m_ddev_targp,
-			XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
-			XFS_FSS_TO_BB(mp, 1), 0, &bp);
-	if (error)
-		return error;
-	ASSERT(bp);
+	bp = xfs_buf_read_uncached(mp, mp->m_ddev_targp,
+				XFS_FSB_TO_BB(mp, nb) - XFS_FSS_TO_BB(mp, 1),
+				BBTOB(XFS_FSS_TO_BB(mp, 1)), 0);
+	if (!bp)
+		return EIO;
 	xfs_buf_relse(bp);
 
 	new = nb;	/* use new as a temporary here */
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index fbca293..912101d 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -980,42 +980,35 @@ xfs_check_sizes(xfs_mount_t *mp)
 {
 	xfs_buf_t	*bp;
 	xfs_daddr_t	d;
-	int		error;
 
 	d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_dblocks);
 	if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_dblocks) {
-		cmn_err(CE_WARN, "XFS: size check 1 failed");
+		cmn_err(CE_WARN, "XFS: filesystem size mismatch detected");
 		return XFS_ERROR(EFBIG);
 	}
-	error = xfs_read_buf(mp, mp->m_ddev_targp,
-			     d - XFS_FSS_TO_BB(mp, 1),
-			     XFS_FSS_TO_BB(mp, 1), 0, &bp);
-	if (!error) {
-		xfs_buf_relse(bp);
-	} else {
-		cmn_err(CE_WARN, "XFS: size check 2 failed");
-		if (error == ENOSPC)
-			error = XFS_ERROR(EFBIG);
-		return error;
+	bp = xfs_buf_read_uncached(mp, mp->m_ddev_targp,
+					d - XFS_FSS_TO_BB(mp, 1),
+					BBTOB(XFS_FSS_TO_BB(mp, 1)), 0);
+	if (!bp) {
+		cmn_err(CE_WARN, "XFS: last sector read failed");
+		return EIO;
 	}
+	xfs_buf_relse(bp);
 
 	if (mp->m_logdev_targp != mp->m_ddev_targp) {
 		d = (xfs_daddr_t)XFS_FSB_TO_BB(mp, mp->m_sb.sb_logblocks);
 		if (XFS_BB_TO_FSB(mp, d) != mp->m_sb.sb_logblocks) {
-			cmn_err(CE_WARN, "XFS: size check 3 failed");
+			cmn_err(CE_WARN, "XFS: log size mismatch detected");
 			return XFS_ERROR(EFBIG);
 		}
-		error = xfs_read_buf(mp, mp->m_logdev_targp,
-				     d - XFS_FSB_TO_BB(mp, 1),
-				     XFS_FSB_TO_BB(mp, 1), 0, &bp);
-		if (!error) {
-			xfs_buf_relse(bp);
-		} else {
-			cmn_err(CE_WARN, "XFS: size check 3 failed");
-			if (error == ENOSPC)
-				error = XFS_ERROR(EFBIG);
-			return error;
+		bp = xfs_buf_read_uncached(mp, mp->m_logdev_targp,
+					d - XFS_FSB_TO_BB(mp, 1),
+					XFS_FSB_TO_B(mp, 1), 0);
+		if (!bp) {
+			cmn_err(CE_WARN, "XFS: log device read failed");
+			return EIO;
 		}
+		xfs_buf_relse(bp);
 	}
 	return 0;
 }
diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 891260f..12a1913 100644
--- a/fs/xfs/xfs_rtalloc.c
+++ b/fs/xfs/xfs_rtalloc.c
@@ -39,6 +39,7 @@
 #include "xfs_trans_space.h"
 #include "xfs_utils.h"
 #include "xfs_trace.h"
+#include "xfs_buf.h"
 
 
 /*
@@ -1883,13 +1884,13 @@ xfs_growfs_rt(
 	/*
 	 * Read in the last block of the device, make sure it exists.
 	 */
-	error = xfs_read_buf(mp, mp->m_rtdev_targp,
-			XFS_FSB_TO_BB(mp, nrblocks - 1),
-			XFS_FSB_TO_BB(mp, 1), 0, &bp);
-	if (error)
-		return error;
-	ASSERT(bp);
+	bp = xfs_buf_read_uncached(mp, mp->m_rtdev_targp,
+				XFS_FSB_TO_BB(mp, nrblocks - 1),
+				XFS_FSB_TO_B(mp, 1), 0);
+	if (!bp)
+		return EIO;
 	xfs_buf_relse(bp);
+
 	/*
 	 * Calculate new parameters.  These are the final values to be reached.
 	 */
@@ -2215,7 +2216,6 @@ xfs_rtmount_init(
 {
 	xfs_buf_t	*bp;	/* buffer for last block of subvolume */
 	xfs_daddr_t	d;	/* address of last block of subvolume */
-	int		error;	/* error return value */
 	xfs_sb_t	*sbp;	/* filesystem superblock copy in mount */
 
 	sbp = &mp->m_sb;
@@ -2242,15 +2242,12 @@ xfs_rtmount_init(
 			(unsigned long long) mp->m_sb.sb_rblocks);
 		return XFS_ERROR(EFBIG);
 	}
-	error = xfs_read_buf(mp, mp->m_rtdev_targp,
-				d - XFS_FSB_TO_BB(mp, 1),
-				XFS_FSB_TO_BB(mp, 1), 0, &bp);
-	if (error) {
-		cmn_err(CE_WARN,
-	"XFS: realtime mount -- xfs_read_buf failed, returned %d", error);
-		if (error == ENOSPC)
-			return XFS_ERROR(EFBIG);
-		return error;
+	bp = xfs_buf_read_uncached(mp, mp->m_rtdev_targp,
+					d - XFS_FSB_TO_BB(mp, 1),
+					XFS_FSB_TO_B(mp, 1), 0);
+	if (!bp) {
+		cmn_err(CE_WARN, "XFS: realtime device size check failed");
+		return EIO;
 	}
 	xfs_buf_relse(bp);
 	return 0;
-- 
1.7.1

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  parent reply	other threads:[~2010-09-24 12:30 UTC|newest]

Thread overview: 26+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-09-24 12:30 [PATCH 0/18] xfs: metadata scalability V3 Dave Chinner
2010-09-24 12:30 ` [PATCH 01/18] xfs: force background CIL push under sustained load Dave Chinner
2010-09-24 12:31 ` [PATCH 02/18] xfs: reduce the number of CIL lock round trips during commit Dave Chinner
2010-09-24 12:31 ` [PATCH 03/18] xfs: remove debug assert for per-ag reference counting Dave Chinner
2010-09-24 12:31 ` [PATCH 04/18] xfs: lockless per-ag lookups Dave Chinner
2010-09-24 12:31 ` [PATCH 05/18] xfs: don't use vfs writeback for pure metadata modifications Dave Chinner
2010-09-25 23:42   ` Christoph Hellwig
2010-09-27  1:09     ` Dave Chinner
2010-09-24 12:31 ` [PATCH 06/18] xfs: rename xfs_buf_get_nodaddr to be more appropriate Dave Chinner
2010-09-24 12:31 ` [PATCH 07/18] xfs: introduced uncached buffer read primitve Dave Chinner
2010-09-24 12:31 ` [PATCH 08/18] xfs: store xfs_mount in the buftarg instead of in the xfs_buf Dave Chinner
2010-09-24 12:31 ` [PATCH 09/18] xfs: kill XBF_FS_MANAGED buffers Dave Chinner
2010-09-24 12:31 ` Dave Chinner [this message]
2010-09-24 12:31 ` [PATCH 11/18] xfs: remove buftarg hash for external devices Dave Chinner
2010-09-24 12:31 ` [PATCH 12/18] xfs: split inode AG walking into separate code for reclaim Dave Chinner
2010-09-24 12:31 ` [PATCH 13/18] xfs: split out inode walk inode grabbing Dave Chinner
2010-09-25 16:31   ` Christoph Hellwig
2010-09-24 12:31 ` [PATCH 14/18] xfs: implement batched inode lookups for AG walking Dave Chinner
2010-09-25 16:32   ` Christoph Hellwig
2010-09-24 12:31 ` [PATCH 15/18] xfs: batch inode reclaim lookup Dave Chinner
2010-09-24 12:31 ` [PATCH 16/18] xfs: serialise inode reclaim within an AG Dave Chinner
2010-09-25 23:49   ` Christoph Hellwig
2010-09-27  0:56     ` Dave Chinner
2010-09-24 12:31 ` [PATCH 17/18] xfs: convert buffer cache hash to rbtree Dave Chinner
2010-09-24 12:31 ` [PATCH 18/18] xfs: pack xfs_buf structure more tightly Dave Chinner
  -- strict thread matches above, loose matches on Subject: below --
2010-09-27  1:47 [PATCH 0/18] xfs: metadata scalability V4 Dave Chinner
2010-09-27  1:47 ` [PATCH 10/18] xfs: use unhashed buffers for size checks Dave Chinner

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