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authorYingping Lu <yingping@sgi.com>2006-06-09 08:55:18 +0400
committerNathan Scott <nathans@sgi.com>2006-06-09 08:55:18 +0400
commitd210a28cd851082cec9b282443f8cc0e6fc09830 (patch)
tree77b8c843d4cb7e6095b607570c5fd16702e50592 /fs/xfs/xfs_alloc.h
parentd3446eac3f50dade2f09ed212b112609ee78fb33 (diff)
downloadlinux-d210a28cd851082cec9b282443f8cc0e6fc09830.tar.xz
[XFS] In actual allocation of file system blocks and freeing extents, the
transaction within each such operation may involve multiple locking of AGF buffer. While the freeing extent function has sorted the extents based on AGF number before entering into transaction, however, when the file system space is very limited, the allocation of space would try every AGF to get space allocated, this could potentially cause out-of-order locking, thus deadlock could happen. This fix mitigates the scarce space for allocation by setting aside a few blocks without reservation, and avoid deadlock by maintaining ascending order of AGF locking. SGI-PV: 947395 SGI-Modid: xfs-linux-melb:xfs-kern:210801a Signed-off-by: Yingping Lu <yingping@sgi.com> Signed-off-by: Nathan Scott <nathans@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_alloc.h')
-rw-r--r--fs/xfs/xfs_alloc.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/xfs/xfs_alloc.h b/fs/xfs/xfs_alloc.h
index 2d1f8928b267..650591f999ae 100644
--- a/fs/xfs/xfs_alloc.h
+++ b/fs/xfs/xfs_alloc.h
@@ -41,6 +41,7 @@ typedef enum xfs_alloctype
* Flags for xfs_alloc_fix_freelist.
*/
#define XFS_ALLOC_FLAG_TRYLOCK 0x00000001 /* use trylock for buffer locking */
+#define XFS_ALLOC_FLAG_FREEING 0x00000002 /* indicate caller is freeing extents*/
/*
* Argument structure for xfs_alloc routines.
@@ -70,6 +71,7 @@ typedef struct xfs_alloc_arg {
char wasfromfl; /* set if allocation is from freelist */
char isfl; /* set if is freelist blocks - !acctg */
char userdata; /* set if this is user data */
+ xfs_fsblock_t firstblock; /* io first block allocated */
} xfs_alloc_arg_t;
/*