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authorDave Chinner <dchinner@redhat.com>2010-09-22 04:47:20 +0400
committerAlex Elder <aelder@sgi.com>2010-10-19 00:07:50 +0400
commit1922c949c59f93beb560d59874bcc6d5c00115ac (patch)
treef680f7cc4a36f9233f2c54c473a69a658ea9e224 /fs/xfs/xfs_rtalloc.c
parent26af655233dd486659235f3049959d2f7dafc5a1 (diff)
downloadlinux-1922c949c59f93beb560d59874bcc6d5c00115ac.tar.xz
xfs: use unhashed buffers for size checks
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>
Diffstat (limited to 'fs/xfs/xfs_rtalloc.c')
-rw-r--r--fs/xfs/xfs_rtalloc.c29
1 files changed, 13 insertions, 16 deletions
diff --git a/fs/xfs/xfs_rtalloc.c b/fs/xfs/xfs_rtalloc.c
index 891260fea11e..12a191385310 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;