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authorRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-11-29 17:03:04 +0300
committerRyusuke Konishi <konishi.ryusuke@lab.ntt.co.jp>2009-11-30 15:17:52 +0300
commita694291a6211537189c6080f77f63cdabfc9b63e (patch)
treeec23d36fc493eeaaedd72f54187652f9df3b4819 /fs/nilfs2/segbuf.c
parente29df395bc6d2d0c89b3d8a5939a24b1b43c2fb6 (diff)
downloadlinux-a694291a6211537189c6080f77f63cdabfc9b63e.tar.xz
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/segbuf.c')
-rw-r--r--fs/nilfs2/segbuf.c16
1 files changed, 16 insertions, 0 deletions
diff --git a/fs/nilfs2/segbuf.c b/fs/nilfs2/segbuf.c
index d856d62bf886..645c78656aa0 100644
--- a/fs/nilfs2/segbuf.c
+++ b/fs/nilfs2/segbuf.c
@@ -100,6 +100,22 @@ void nilfs_segbuf_map(struct nilfs_segment_buffer *segbuf, __u64 segnum,
segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1;
}
+/**
+ * nilfs_segbuf_map_cont - map a new log behind a given log
+ * @segbuf: new segment buffer
+ * @prev: segment buffer containing a log to be continued
+ */
+void nilfs_segbuf_map_cont(struct nilfs_segment_buffer *segbuf,
+ struct nilfs_segment_buffer *prev)
+{
+ segbuf->sb_segnum = prev->sb_segnum;
+ segbuf->sb_fseg_start = prev->sb_fseg_start;
+ segbuf->sb_fseg_end = prev->sb_fseg_end;
+ segbuf->sb_pseg_start = prev->sb_pseg_start + prev->sb_sum.nblocks;
+ segbuf->sb_rest_blocks =
+ segbuf->sb_fseg_end - segbuf->sb_pseg_start + 1;
+}
+
void nilfs_segbuf_set_next_segnum(struct nilfs_segment_buffer *segbuf,
__u64 nextnum, struct the_nilfs *nilfs)
{