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authorLachlan McIlroy <lachlan@sgi.com>2007-05-08 13:50:19 +1000
committerTim Shimmin <tes@sgi.com>2007-05-08 13:50:19 +1000
commitf7c66ce3f70d8417de0cfb481ca4e5430382ec5d (patch)
treec9b4d5cb09a9241cb305532edfbd703cd181530d /fs/xfs/xfs_inode.h
parent71dfd5a396d11512aa6c8ed0d35b268bc084bb9b (diff)
downloadop-kernel-dev-f7c66ce3f70d8417de0cfb481ca4e5430382ec5d.zip
op-kernel-dev-f7c66ce3f70d8417de0cfb481ca4e5430382ec5d.tar.gz
[XFS] Add lockdep support for XFS
SGI-PV: 963965 SGI-Modid: xfs-linux-melb:xfs-kern:28485a Signed-off-by: Lachlan McIlroy <lachlan@sgi.com> Signed-off-by: David Chinner <dgc@sgi.com> Signed-off-by: Tim Shimmin <tes@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_inode.h')
-rw-r--r--fs/xfs/xfs_inode.h60
1 files changed, 46 insertions, 14 deletions
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index cfe7b58..f75afec 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -382,26 +382,58 @@ xfs_iflags_test(xfs_inode_t *ip, unsigned short flags)
/*
* Flags for inode locking.
+ * Bit ranges: 1<<1 - 1<<16-1 -- iolock/ilock modes (bitfield)
+ * 1<<16 - 1<<32-1 -- lockdep annotation (integers)
*/
-#define XFS_IOLOCK_EXCL 0x001
-#define XFS_IOLOCK_SHARED 0x002
-#define XFS_ILOCK_EXCL 0x004
-#define XFS_ILOCK_SHARED 0x008
-#define XFS_IUNLOCK_NONOTIFY 0x010
-/* XFS_IOLOCK_NESTED 0x020 */
-#define XFS_EXTENT_TOKEN_RD 0x040
-#define XFS_SIZE_TOKEN_RD 0x080
+#define XFS_IOLOCK_EXCL (1<<0)
+#define XFS_IOLOCK_SHARED (1<<1)
+#define XFS_ILOCK_EXCL (1<<2)
+#define XFS_ILOCK_SHARED (1<<3)
+#define XFS_IUNLOCK_NONOTIFY (1<<4)
+/* #define XFS_IOLOCK_NESTED (1<<5) */
+#define XFS_EXTENT_TOKEN_RD (1<<6)
+#define XFS_SIZE_TOKEN_RD (1<<7)
#define XFS_EXTSIZE_RD (XFS_EXTENT_TOKEN_RD|XFS_SIZE_TOKEN_RD)
-#define XFS_WILLLEND 0x100 /* Always acquire tokens for lending */
+#define XFS_WILLLEND (1<<8) /* Always acquire tokens for lending */
#define XFS_EXTENT_TOKEN_WR (XFS_EXTENT_TOKEN_RD | XFS_WILLLEND)
#define XFS_SIZE_TOKEN_WR (XFS_SIZE_TOKEN_RD | XFS_WILLLEND)
#define XFS_EXTSIZE_WR (XFS_EXTSIZE_RD | XFS_WILLLEND)
-/* XFS_SIZE_TOKEN_WANT 0x200 */
+/* TODO:XFS_SIZE_TOKEN_WANT (1<<9) */
-#define XFS_LOCK_MASK \
- (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED | XFS_ILOCK_EXCL | \
- XFS_ILOCK_SHARED | XFS_EXTENT_TOKEN_RD | XFS_SIZE_TOKEN_RD | \
- XFS_WILLLEND)
+#define XFS_LOCK_MASK (XFS_IOLOCK_EXCL | XFS_IOLOCK_SHARED \
+ | XFS_ILOCK_EXCL | XFS_ILOCK_SHARED \
+ | XFS_EXTENT_TOKEN_RD | XFS_SIZE_TOKEN_RD \
+ | XFS_WILLLEND)
+
+/*
+ * Flags for lockdep annotations.
+ *
+ * XFS_I[O]LOCK_PARENT - for operations that require locking two inodes
+ * (ie directory operations that require locking a directory inode and
+ * an entry inode). The first inode gets locked with this flag so it
+ * gets a lockdep subclass of 1 and the second lock will have a lockdep
+ * subclass of 0.
+ *
+ * XFS_I[O]LOCK_INUMORDER - for locking several inodes at the some time
+ * with xfs_lock_inodes(). This flag is used as the starting subclass
+ * and each subsequent lock acquired will increment the subclass by one.
+ * So the first lock acquired will have a lockdep subclass of 2, the
+ * second lock will have a lockdep subclass of 3, and so on.
+ */
+#define XFS_IOLOCK_SHIFT 16
+#define XFS_IOLOCK_PARENT (1 << XFS_IOLOCK_SHIFT)
+#define XFS_IOLOCK_INUMORDER (2 << XFS_IOLOCK_SHIFT)
+
+#define XFS_ILOCK_SHIFT 24
+#define XFS_ILOCK_PARENT (1 << XFS_ILOCK_SHIFT)
+#define XFS_ILOCK_INUMORDER (2 << XFS_ILOCK_SHIFT)
+
+#define XFS_IOLOCK_DEP_MASK 0x00ff0000
+#define XFS_ILOCK_DEP_MASK 0xff000000
+#define XFS_LOCK_DEP_MASK (XFS_IOLOCK_DEP_MASK | XFS_ILOCK_DEP_MASK)
+
+#define XFS_IOLOCK_DEP(flags) (((flags) & XFS_IOLOCK_DEP_MASK) >> XFS_IOLOCK_SHIFT)
+#define XFS_ILOCK_DEP(flags) (((flags) & XFS_ILOCK_DEP_MASK) >> XFS_ILOCK_SHIFT)
/*
* Flags for xfs_iflush()
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