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Diffstat (limited to 'fs/ocfs2/uptodate.c')
-rw-r--r--fs/ocfs2/uptodate.c21
1 files changed, 19 insertions, 2 deletions
diff --git a/fs/ocfs2/uptodate.c b/fs/ocfs2/uptodate.c
index b8a00a793326..9707ed7a3206 100644
--- a/fs/ocfs2/uptodate.c
+++ b/fs/ocfs2/uptodate.c
@@ -206,7 +206,10 @@ static int ocfs2_buffer_cached(struct ocfs2_inode_info *oi,
}
/* Warning: even if it returns true, this does *not* guarantee that
- * the block is stored in our inode metadata cache. */
+ * the block is stored in our inode metadata cache.
+ *
+ * This can be called under lock_buffer()
+ */
int ocfs2_buffer_uptodate(struct inode *inode,
struct buffer_head *bh)
{
@@ -226,6 +229,16 @@ int ocfs2_buffer_uptodate(struct inode *inode,
return ocfs2_buffer_cached(OCFS2_I(inode), bh);
}
+/*
+ * Determine whether a buffer is currently out on a read-ahead request.
+ * ip_io_sem should be held to serialize submitters with the logic here.
+ */
+int ocfs2_buffer_read_ahead(struct inode *inode,
+ struct buffer_head *bh)
+{
+ return buffer_locked(bh) && ocfs2_buffer_cached(OCFS2_I(inode), bh);
+}
+
/* Requires ip_lock */
static void ocfs2_append_cache_array(struct ocfs2_caching_info *ci,
sector_t block)
@@ -403,7 +416,11 @@ out_free:
*
* Note that this function may actually fail to insert the block if
* memory cannot be allocated. This is not fatal however (but may
- * result in a performance penalty) */
+ * result in a performance penalty)
+ *
+ * Readahead buffers can be passed in here before the I/O request is
+ * completed.
+ */
void ocfs2_set_buffer_uptodate(struct inode *inode,
struct buffer_head *bh)
{