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authorDavid Chinner <dgc@sgi.com>2006-03-14 13:29:16 +1100
committerNathan Scott <nathans@sgi.com>2006-03-14 13:29:16 +1100
commit01e1b69cfcdcfdd5b405165eaba29428f8b18a7c (patch)
tree3ca7e8d0047ff03ca532f39b0fc4cd50381e8ecc /fs/xfs/xfs_mount.h
parent87cbc49cd4b773a972bce56c5dd09c4717f3285b (diff)
[XFS] using a spinlock per cpu for superblock counter exclusion results in
a preēmpt counter overflow at 256p and above. Change the exclusion mechanism to use atomic bit operations and busy wait loops to emulate the spin lock exclusion mechanism but without the preempt count issues. SGI-PV: 950027 SGI-Modid: xfs-linux-melb:xfs-kern:25338a Signed-off-by: David Chinner <dgc@sgi.com> Signed-off-by: Nathan Scott <nathans@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_mount.h')
-rw-r--r--fs/xfs/xfs_mount.h4
1 files changed, 3 insertions, 1 deletions
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index 9d2ffbdc37a..29cfcf0c11b 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -280,9 +280,11 @@ typedef struct xfs_icsb_cnts {
uint64_t icsb_fdblocks;
uint64_t icsb_ifree;
uint64_t icsb_icount;
- spinlock_t icsb_lock;
+ unsigned long icsb_flags;
} xfs_icsb_cnts_t;
+#define XFS_ICSB_FLAG_LOCK (1 << 0) /* counter lock bit */
+
#define XFS_ICSB_SB_LOCKED (1 << 0) /* sb already locked */
#define XFS_ICSB_LAZY_COUNT (1 << 1) /* accuracy not needed */