xfs: introduce new internal log vector structure
The current log IO vector structure is a flat array and not
extensible. To make it possible to keep separate log IO vectors for
individual log items, we need a method of chaining log IO vectors
together.
Introduce a new log vector type that can be used to wrap the
existing log IO vectors on use that internally to the log. This
means that the existing external interface (xfs_log_write) does not
change and hence no changes to the transaction commit code are
required.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
diff --git a/fs/xfs/xfs_log.h b/fs/xfs/xfs_log.h
index f3a564d..229d1f3 100644
--- a/fs/xfs/xfs_log.h
+++ b/fs/xfs/xfs_log.h
@@ -110,6 +110,12 @@
uint i_type; /* type of region */
} xfs_log_iovec_t;
+struct xfs_log_vec {
+ struct xfs_log_vec *lv_next; /* next lv in build list */
+ int lv_niovecs; /* number of iovecs in lv */
+ struct xfs_log_iovec *lv_iovecp; /* iovec array */
+};
+
/*
* Structure used to pass callback function and the function's argument
* to the log manager.