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[PATCH 12/18] xfs: use unhashed buffers for size checks

To: xfs@xxxxxxxxxxx
Subject: [PATCH 12/18] xfs: use unhashed buffers for size checks
From: Dave Chinner <david@xxxxxxxxxxxxx>
Date: Tue, 14 Sep 2010 20:56:11 +1000
In-reply-to: <1284461777-1496-1-git-send-email-david@xxxxxxxxxxxxx>
References: <1284461777-1496-1-git-send-email-david@xxxxxxxxxxxxx>
From: Dave Chinner <dchinner@xxxxxxxxxx>

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@xxxxxxxxxx>
---
 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..158d5ab 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)));
+       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 4d727d0..d1498a6 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -979,42 +979,35 @@ 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)));
+       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));
+               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..5c5a4c4 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));
+       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));
+       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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