xfs: add support for large btree blocks

Add support for larger btree blocks that contains a CRC32C checksum,
a filesystem uuid and block number for detecting filesystem
consistency and out of place writes.

[dchinner@redhat.com] Also include an owner field to allow reverse
mappings to be implemented for improved repairability and a LSN
field to so that log recovery can easily determine the last
modification that made it to disk for each buffer.

[dchinner@redhat.com] Add buffer log format flags to indicate the
type of buffer to recovery so that we don't have to do blind magic
number tests to determine what the buffer is.

[dchinner@redhat.com] Modified to fit into the verifier structure.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

1 files changed, 23 insertions, 6 deletions

diff --git a/fs/xfs/xfs_trans_buf.c b/fs/xfs/xfs_trans_buf.c
index 3edf5db..f950edd 100644
--- a/fs/xfs/xfs_trans_buf.c
+++ b/fs/xfs/xfs_trans_buf.c
@@ -659,6 +659,7 @@ xfs_trans_binval(
 		ASSERT(XFS_BUF_ISSTALE(bp));
 		ASSERT(!(bip->bli_flags & (XFS_BLI_LOGGED | XFS_BLI_DIRTY)));
 		ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_INODE_BUF));
+		ASSERT(!(bip->__bli_format.blf_flags & XFS_BLF_TYPE_MASK));
 		ASSERT(bip->__bli_format.blf_flags & XFS_BLF_CANCEL);
 		ASSERT(bip->bli_item.li_desc->lid_flags & XFS_LID_DIRTY);
 		ASSERT(tp->t_flags & XFS_TRANS_DIRTY);
@@ -671,6 +672,7 @@ xfs_trans_binval(
 	bip->bli_flags &= ~(XFS_BLI_INODE_BUF | XFS_BLI_LOGGED | XFS_BLI_DIRTY);
 	bip->__bli_format.blf_flags &= ~XFS_BLF_INODE_BUF;
 	bip->__bli_format.blf_flags |= XFS_BLF_CANCEL;
+	bip->__bli_format.blf_flags &= ~XFS_BLF_TYPE_MASK;
 	for (i = 0; i < bip->bli_format_count; i++) {
 		memset(bip->bli_formats[i].blf_data_map, 0,
 		       (bip->bli_formats[i].blf_map_size * sizeof(uint)));
@@ -751,6 +753,26 @@ xfs_trans_inode_alloc_buf(
 	bip->bli_flags |= XFS_BLI_INODE_ALLOC_BUF;
 }
 
+/*
+ * Set the type of the buffer for log recovery so that it can correctly identify
+ * and hence attach the correct buffer ops to the buffer after replay.
+ */
+void
+xfs_trans_buf_set_type(
+	struct xfs_trans	*tp,
+	struct xfs_buf		*bp,
+	uint			type)
+{
+	struct xfs_buf_log_item	*bip = bp->b_fspriv;
+
+	ASSERT(bp->b_transp == tp);
+	ASSERT(bip != NULL);
+	ASSERT(atomic_read(&bip->bli_refcount) > 0);
+	ASSERT((type & XFS_BLF_TYPE_MASK) != 0);
+
+	bip->__bli_format.blf_flags &= ~XFS_BLF_TYPE_MASK;
+	bip->__bli_format.blf_flags |= type;
+}
 
 /*
  * Similar to xfs_trans_inode_buf(), this marks the buffer as a cluster of
@@ -769,14 +791,9 @@ xfs_trans_dquot_buf(
 	xfs_buf_t	*bp,
 	uint		type)
 {
-	xfs_buf_log_item_t	*bip = bp->b_fspriv;
-
-	ASSERT(bp->b_transp == tp);
-	ASSERT(bip != NULL);
 	ASSERT(type == XFS_BLF_UDQUOT_BUF ||
 	       type == XFS_BLF_PDQUOT_BUF ||
 	       type == XFS_BLF_GDQUOT_BUF);
-	ASSERT(atomic_read(&bip->bli_refcount) > 0);
 
-	bip->__bli_format.blf_flags |= type;
+	xfs_trans_buf_set_type(tp, bp, type);
 }