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authorLachlan McIlroy <lachlan@sgi.com>2008-08-13 16:51:57 +1000
committerLachlan McIlroy <lachlan@redback.melbourne.sgi.com>2008-08-13 16:51:57 +1000
commit5695ef46ef02ba1c6658daa46e6879a2d4f52f5f (patch)
tree885687ac9cdbba4717f01eef26195fd4eef2ee90 /fs/xfs/linux-2.6/xfs_buf.c
parentd62c251fe4a06144255291cffd68cbadf3bf002f (diff)
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[XFS] Use KM_NOFS for debug trace buffers
Use KM_NOFS to prevent recursion back into the filesystem which can cause deadlocks. In the case of xfs_iread() we hold the lock on the inode cluster buffer while allocating memory for the trace buffers. If we recurse back into XFS to flush data that may require a transaction to allocate extents which needs log space. This can deadlock with the xfsaild thread which can't push the tail of the log because it is trying to get the inode cluster buffer lock. SGI-PV: 981498 SGI-Modid: xfs-linux-melb:xfs-kern:31838a Signed-off-by: Lachlan McIlroy <lachlan@sgi.com> Signed-off-by: David Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/linux-2.6/xfs_buf.c')
-rw-r--r--fs/xfs/linux-2.6/xfs_buf.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c
index a0072d9315a..986061ae1b9 100644
--- a/fs/xfs/linux-2.6/xfs_buf.c
+++ b/fs/xfs/linux-2.6/xfs_buf.c
@@ -1795,7 +1795,7 @@ int __init
xfs_buf_init(void)
{
#ifdef XFS_BUF_TRACE
- xfs_buf_trace_buf = ktrace_alloc(XFS_BUF_TRACE_SIZE, KM_SLEEP);
+ xfs_buf_trace_buf = ktrace_alloc(XFS_BUF_TRACE_SIZE, KM_NOFS);
#endif
xfs_buf_zone = kmem_zone_init_flags(sizeof(xfs_buf_t), "xfs_buf",