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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-11-29 23:03:04 +0900
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-11-30 21:17:52 +0900
commita694291a6211537189c6080f77f63cdabfc9b63e (patch)
treeec23d36fc493eeaaedd72f54187652f9df3b4819 /fs/nilfs2/segment.h
parente29df395bc6d2d0c89b3d8a5939a24b1b43c2fb6 (diff)
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op-kernel-dev-a694291a6211537189c6080f77f63cdabfc9b63e.tar.gz
nilfs2: separate wait function from nilfs_segctor_write
This separates wait function for submitted logs from the write function nilfs_segctor_write(). A new list of segment buffers "sc_write_logs" is added to hold logs under writing, and double buffering is partially applied to hide io latency. At this point, the double buffering is disabled for blocksize < pagesize because page dirty flag is turned off during write and dirty buffers are not properly collected for pages crossing over segments. To receive full benefit of the double buffering, further refinement is needed to move the io wait outside the lock section of log writer. Signed-off-by: Ryusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>
Diffstat (limited to 'fs/nilfs2/segment.h')
-rw-r--r--fs/nilfs2/segment.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/fs/nilfs2/segment.h b/fs/nilfs2/segment.h
index 0d2a475..3d3ab2f 100644
--- a/fs/nilfs2/segment.h
+++ b/fs/nilfs2/segment.h
@@ -97,6 +97,7 @@ struct nilfs_segsum_pointer {
* @sc_dsync_start: start byte offset of data pages
* @sc_dsync_end: end byte offset of data pages (inclusive)
* @sc_segbufs: List of segment buffers
+ * @sc_write_logs: List of segment buffers to hold logs under writing
* @sc_segbuf_nblocks: Number of available blocks in segment buffers.
* @sc_curseg: Current segment buffer
* @sc_super_root: Pointer to the super root buffer
@@ -143,6 +144,7 @@ struct nilfs_sc_info {
/* Segment buffers */
struct list_head sc_segbufs;
+ struct list_head sc_write_logs;
unsigned long sc_segbuf_nblocks;
struct nilfs_segment_buffer *sc_curseg;
struct buffer_head *sc_super_root;
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