[PATCH 06/15] xfs: RT bitmap and summary buffers are not typed

[Dave Chinner]

From: Dave Chinner <dchinner at redhat.com>

Source kernel commit f67ca6eca89cddd355c83639a90109e245f9d5a7

When logging buffers, we attach a type to them that follows the
buffer all the way into the log and is used to identify the buffer
contents in log recovery. Both the realtime summary buffers and the
bitmap buffers do not have types defined or set, so when we try to
log them we see assert failure:

XFS: Assertion failed: (bip->bli_flags & XFS_BLI_STALE) || (xfs_blft_from_flags(&bip->__bli_format) > XFS_BLFT_UNKNOWN_BUF && xfs_blft_from_flags(&bip->__bli_format) < XFS_BLFT_MAX_BUF), file: fs/xfs/xfs_buf_item.c, line: 294

Fix this by adding buffer log format types for these buffers, and
add identification support into log recovery for them. Only build the log
recovery support if CONFIG_XFS_RT=y - we can't get into log recovery for real
time filesystems if support is not built into the kernel, and this avoids
potential build problems.

Signed-off-by: Dave Chinner <dchinner at redhat.com>
Tested-by: Ross Zwisler <ross.zwisler at linux.intel.com>
Reviewed-by: Eric Sandeen <sandeen at redhat.com>
Signed-off-by: Dave Chinner <david at fromorbit.com>
---
 libxfs/xfs_log_format.h | 2 ++
 libxfs/xfs_rtbitmap.c   | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/libxfs/xfs_log_format.h b/libxfs/xfs_log_format.h
index db8ceeb..c860345 100644
--- a/libxfs/xfs_log_format.h
+++ b/libxfs/xfs_log_format.h
@@ -495,6 +495,8 @@ enum xfs_blft {
 	XFS_BLFT_ATTR_LEAF_BUF,
 	XFS_BLFT_ATTR_RMT_BUF,
 	XFS_BLFT_SB_BUF,
+	XFS_BLFT_RTBITMAP_BUF,
+	XFS_BLFT_RTSUMMARY_BUF,
 	XFS_BLFT_MAX_BUF = (1 << XFS_BLFT_BITS),
 };
 
diff --git a/libxfs/xfs_rtbitmap.c b/libxfs/xfs_rtbitmap.c
index 5648ea5..3e61eb2 100644
--- a/libxfs/xfs_rtbitmap.c
+++ b/libxfs/xfs_rtbitmap.c
@@ -66,6 +66,9 @@ xfs_rtbuf_get(
 				   mp->m_bsize, 0, &bp, NULL);
 	if (error)
 		return error;
+
+	xfs_trans_buf_set_type(tp, bp, issum ? XFS_BLFT_RTSUMMARY_BUF
+					     : XFS_BLFT_RTBITMAP_BUF);
 	*bpp = bp;
 	return 0;
 }
-- 
2.7.0