diff options
Diffstat (limited to 'fs/buffer.c')
| -rw-r--r-- | fs/buffer.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/fs/buffer.c b/fs/buffer.c index 480903405789..89c3c6d9d60d 100644 --- a/fs/buffer.c +++ b/fs/buffer.c @@ -168,14 +168,25 @@ static void end_buffer_write(struct buffer_head *bh, int uptodate) unlock_buffer(bh); } -/* The buffers have been marked clean and locked. Just submit the dang things.. */ +/* + * The buffers have been marked clean and locked. Just submit the dang + * things.. + * + * We'll wait for the first one of them - "sync" is not exactly + * performance-critical, and this makes us not hog the IO subsystem + * completely, while still allowing for a fair amount of concurrent IO. + */ static void write_locked_buffers(struct buffer_head **array, unsigned int count) { + struct buffer_head *wait = *array; + atomic_inc(&wait->b_count); do { struct buffer_head * bh = *array++; bh->b_end_io = end_buffer_write; submit_bh(WRITE, bh); } while (--count); + wait_on_buffer(wait); + atomic_dec(&wait->b_count); } #define NRSYNC (32) |