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authorDave Chinner <dchinner@redhat.com>2010-09-22 10:47:20 +1000
committerAlex Elder <aelder@sgi.com>2010-10-18 15:07:49 -0500
commit26af655233dd486659235f3049959d2f7dafc5a1 (patch)
tree590b4976871582d6cad34880705a9a4021e204f5 /fs/xfs/xfs_mount.c
parentebad861b5702c3e2332a3e906978f47144d22f70 (diff)
xfs: kill XBF_FS_MANAGED buffers
Filesystem level managed buffers are buffers that have their lifecycle controlled by the filesystem layer, not the buffer cache. We currently cache these buffers, which makes cleanup and cache walking somewhat troublesome. Convert the fs managed buffers to uncached buffers obtained by via xfs_buf_get_uncached(), and remove the XBF_FS_MANAGED special cases from 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_mount.c')
-rw-r--r--fs/xfs/xfs_mount.c55
1 files changed, 16 insertions, 39 deletions
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index 14fc6e9e181..fbca293326e 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -646,7 +646,6 @@ int
xfs_readsb(xfs_mount_t *mp, int flags)
{
unsigned int sector_size;
- unsigned int extra_flags;
xfs_buf_t *bp;
int error;
@@ -659,28 +658,24 @@ xfs_readsb(xfs_mount_t *mp, int flags)
* access to the superblock.
*/
sector_size = xfs_getsize_buftarg(mp->m_ddev_targp);
- extra_flags = XBF_LOCK | XBF_FS_MANAGED | XBF_MAPPED;
- bp = xfs_buf_read(mp->m_ddev_targp, XFS_SB_DADDR, BTOBB(sector_size),
- extra_flags);
- if (!bp || XFS_BUF_ISERROR(bp)) {
- xfs_fs_mount_cmn_err(flags, "SB read failed");
- error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
- goto fail;
+reread:
+ bp = xfs_buf_read_uncached(mp, mp->m_ddev_targp,
+ XFS_SB_DADDR, sector_size, 0);
+ if (!bp) {
+ xfs_fs_mount_cmn_err(flags, "SB buffer read failed");
+ return EIO;
}
- ASSERT(XFS_BUF_ISBUSY(bp));
- ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
/*
* Initialize the mount structure from the superblock.
* But first do some basic consistency checking.
*/
xfs_sb_from_disk(&mp->m_sb, XFS_BUF_TO_SBP(bp));
-
error = xfs_mount_validate_sb(mp, &(mp->m_sb), flags);
if (error) {
xfs_fs_mount_cmn_err(flags, "SB validate failed");
- goto fail;
+ goto release_buf;
}
/*
@@ -691,7 +686,7 @@ xfs_readsb(xfs_mount_t *mp, int flags)
"device supports only %u byte sectors (not %u)",
sector_size, mp->m_sb.sb_sectsize);
error = ENOSYS;
- goto fail;
+ goto release_buf;
}
/*
@@ -699,33 +694,20 @@ xfs_readsb(xfs_mount_t *mp, int flags)
* re-read the superblock so the buffer is correctly sized.
*/
if (sector_size < mp->m_sb.sb_sectsize) {
- XFS_BUF_UNMANAGE(bp);
xfs_buf_relse(bp);
sector_size = mp->m_sb.sb_sectsize;
- bp = xfs_buf_read(mp->m_ddev_targp, XFS_SB_DADDR,
- BTOBB(sector_size), extra_flags);
- if (!bp || XFS_BUF_ISERROR(bp)) {
- xfs_fs_mount_cmn_err(flags, "SB re-read failed");
- error = bp ? XFS_BUF_GETERROR(bp) : ENOMEM;
- goto fail;
- }
- ASSERT(XFS_BUF_ISBUSY(bp));
- ASSERT(XFS_BUF_VALUSEMA(bp) <= 0);
+ goto reread;
}
/* Initialize per-cpu counters */
xfs_icsb_reinit_counters(mp);
mp->m_sb_bp = bp;
- xfs_buf_relse(bp);
- ASSERT(XFS_BUF_VALUSEMA(bp) > 0);
+ xfs_buf_unlock(bp);
return 0;
- fail:
- if (bp) {
- XFS_BUF_UNMANAGE(bp);
- xfs_buf_relse(bp);
- }
+release_buf:
+ xfs_buf_relse(bp);
return error;
}
@@ -2005,18 +1987,13 @@ xfs_getsb(
*/
void
xfs_freesb(
- xfs_mount_t *mp)
+ struct xfs_mount *mp)
{
- xfs_buf_t *bp;
+ struct xfs_buf *bp = mp->m_sb_bp;
- /*
- * Use xfs_getsb() so that the buffer will be locked
- * when we call xfs_buf_relse().
- */
- bp = xfs_getsb(mp, 0);
- XFS_BUF_UNMANAGE(bp);
- xfs_buf_relse(bp);
+ xfs_buf_lock(bp);
mp->m_sb_bp = NULL;
+ xfs_buf_relse(bp);
}
/*