xfs: kill off l_sectbb_mask
There remains only one user of the l_sectbb_mask field in the log
structure. Just kill it off and compute the mask where needed from
the power-of-2 sector size.
(Only update from last post is to accomodate the changes in the
previous patch in the series.)
Signed-off-by: Alex Elder <aelder@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 36e09e3..3038dd5 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -1089,7 +1089,6 @@
}
}
log->l_sectBBsize = 1 << log2_size;
- log->l_sectbb_mask = log->l_sectBBsize - 1;
xlog_get_iclog_buffer_size(mp, log);
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index 56f221d..9cf6951 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -396,9 +396,7 @@
struct xfs_buf_cancel **l_buf_cancel_table;
int l_iclog_hsize; /* size of iclog header */
int l_iclog_heads; /* # of iclog header sectors */
- uint l_sectBBsize; /* sector size in BBs */
- uint l_sectbb_mask; /* sector size (in BBs)
- * alignment mask */
+ uint l_sectBBsize; /* sector size in BBs (2^n) */
int l_iclog_size; /* size of log in bytes */
int l_iclog_size_log; /* log power size of log */
int l_iclog_bufs; /* number of iclog buffers */
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index f1220ec..0de08e3 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -121,6 +121,10 @@
xfs_buf_free(bp);
}
+/*
+ * Return the address of the start of the given block number's data
+ * in a log buffer. The buffer covers a log sector-aligned region.
+ */
STATIC xfs_caddr_t
xlog_align(
xlog_t *log,
@@ -128,14 +132,14 @@
int nbblks,
xfs_buf_t *bp)
{
+ xfs_daddr_t offset;
xfs_caddr_t ptr;
- if (log->l_sectBBsize == 1)
- return XFS_BUF_PTR(bp);
+ offset = blk_no & ((xfs_daddr_t) log->l_sectBBsize - 1);
+ ptr = XFS_BUF_PTR(bp) + BBTOB(offset);
- ptr = XFS_BUF_PTR(bp) + BBTOB((int)blk_no & log->l_sectbb_mask);
- ASSERT(XFS_BUF_SIZE(bp) >=
- BBTOB(nbblks + (blk_no & log->l_sectbb_mask)));
+ ASSERT(ptr + BBTOB(nbblks) <= XFS_BUF_PTR(bp) + XFS_BUF_SIZE(bp));
+
return ptr;
}
