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nilfs2: separate wait function from nilfs_segctor_write

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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>
This commit is contained in:
Ryusuke Konishi
2009-11-29 23:03:04 +09:00
parent e29df395bc
commit a694291a62
4 changed files with 168 additions and 98 deletions
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16
fs/nilfs2/segbuf.c
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@@ -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)
{