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authorDave Chinner <dchinner@redhat.com>2013-08-12 14:49:24 +0400
committerBen Myers <bpm@sgi.com>2013-08-13 01:06:37 +0400
commita8da0da25c9fda7cbfd824979e824ac54d8eef07 (patch)
tree5d2fa9ebd3ead259649aa63ec8dc2f79ef0b2c2d /fs/xfs/xfs_log_format.h
parent69432832fd7466c20c7c92cbd92c561ac78988c2 (diff)
downloadlinux-a8da0da25c9fda7cbfd824979e824ac54d8eef07.tar.xz
xfs: split out buf log item format definitions
Signed-off-by: Dave Chinner <dchinner@redhat.com> Reviewed-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Mark Tinguely <tinguely@sgi.com> Signed-off-by: Ben Myers <bpm@sgi.com>
Diffstat (limited to 'fs/xfs/xfs_log_format.h')
-rw-r--r--fs/xfs/xfs_log_format.h97
1 files changed, 97 insertions, 0 deletions
diff --git a/fs/xfs/xfs_log_format.h b/fs/xfs/xfs_log_format.h
index fd46a7f2293a..77a6024d1180 100644
--- a/fs/xfs/xfs_log_format.h
+++ b/fs/xfs/xfs_log_format.h
@@ -364,4 +364,101 @@ static inline uint xfs_icdinode_size(int version)
return sizeof(struct xfs_icdinode);
return offsetof(struct xfs_icdinode, di_next_unlinked);
}
+
+/*
+ * Buffer Log Format defintions
+ *
+ * These are the physical dirty bitmap defintions for the log format structure.
+ */
+#define XFS_BLF_CHUNK 128
+#define XFS_BLF_SHIFT 7
+#define BIT_TO_WORD_SHIFT 5
+#define NBWORD (NBBY * sizeof(unsigned int))
+
+/*
+ * This flag indicates that the buffer contains on disk inodes
+ * and requires special recovery handling.
+ */
+#define XFS_BLF_INODE_BUF (1<<0)
+
+/*
+ * This flag indicates that the buffer should not be replayed
+ * during recovery because its blocks are being freed.
+ */
+#define XFS_BLF_CANCEL (1<<1)
+
+/*
+ * This flag indicates that the buffer contains on disk
+ * user or group dquots and may require special recovery handling.
+ */
+#define XFS_BLF_UDQUOT_BUF (1<<2)
+#define XFS_BLF_PDQUOT_BUF (1<<3)
+#define XFS_BLF_GDQUOT_BUF (1<<4)
+
+/*
+ * This is the structure used to lay out a buf log item in the
+ * log. The data map describes which 128 byte chunks of the buffer
+ * have been logged.
+ */
+#define XFS_BLF_DATAMAP_SIZE ((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD)
+
+typedef struct xfs_buf_log_format {
+ unsigned short blf_type; /* buf log item type indicator */
+ unsigned short blf_size; /* size of this item */
+ ushort blf_flags; /* misc state */
+ ushort blf_len; /* number of blocks in this buf */
+ __int64_t blf_blkno; /* starting blkno of this buf */
+ unsigned int blf_map_size; /* used size of data bitmap in words */
+ unsigned int blf_data_map[XFS_BLF_DATAMAP_SIZE]; /* dirty bitmap */
+} xfs_buf_log_format_t;
+
+/*
+ * All buffers now need to tell recovery where the magic number
+ * is so that it can verify and calculate the CRCs on the buffer correctly
+ * once the changes have been replayed into the buffer.
+ *
+ * The type value is held in the upper 5 bits of the blf_flags field, which is
+ * an unsigned 16 bit field. Hence we need to shift it 11 bits up and down.
+ */
+#define XFS_BLFT_BITS 5
+#define XFS_BLFT_SHIFT 11
+#define XFS_BLFT_MASK (((1 << XFS_BLFT_BITS) - 1) << XFS_BLFT_SHIFT)
+
+enum xfs_blft {
+ XFS_BLFT_UNKNOWN_BUF = 0,
+ XFS_BLFT_UDQUOT_BUF,
+ XFS_BLFT_PDQUOT_BUF,
+ XFS_BLFT_GDQUOT_BUF,
+ XFS_BLFT_BTREE_BUF,
+ XFS_BLFT_AGF_BUF,
+ XFS_BLFT_AGFL_BUF,
+ XFS_BLFT_AGI_BUF,
+ XFS_BLFT_DINO_BUF,
+ XFS_BLFT_SYMLINK_BUF,
+ XFS_BLFT_DIR_BLOCK_BUF,
+ XFS_BLFT_DIR_DATA_BUF,
+ XFS_BLFT_DIR_FREE_BUF,
+ XFS_BLFT_DIR_LEAF1_BUF,
+ XFS_BLFT_DIR_LEAFN_BUF,
+ XFS_BLFT_DA_NODE_BUF,
+ XFS_BLFT_ATTR_LEAF_BUF,
+ XFS_BLFT_ATTR_RMT_BUF,
+ XFS_BLFT_SB_BUF,
+ XFS_BLFT_MAX_BUF = (1 << XFS_BLFT_BITS),
+};
+
+static inline void
+xfs_blft_to_flags(struct xfs_buf_log_format *blf, enum xfs_blft type)
+{
+ ASSERT(type > XFS_BLFT_UNKNOWN_BUF && type < XFS_BLFT_MAX_BUF);
+ blf->blf_flags &= ~XFS_BLFT_MASK;
+ blf->blf_flags |= ((type << XFS_BLFT_SHIFT) & XFS_BLFT_MASK);
+}
+
+static inline __uint16_t
+xfs_blft_from_flags(struct xfs_buf_log_format *blf)
+{
+ return (blf->blf_flags & XFS_BLFT_MASK) >> XFS_BLFT_SHIFT;
+}
+
#endif /* __XFS_LOG_FORMAT_H__ */