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writeback: improve readability of the wb_writeback() continue/break logic

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And throw some comments in there, too.

Reviewed-by: Wu Fengguang <fengguang.wu@intel.com>
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
This commit is contained in:
Jens Axboe
2009-09-23 19:32:26 +02:00
parent ae1b7f7d4b
commit 71fd05a887
1 changed files with 23 additions and 20 deletions
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21
fs/fs-writeback.c
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@@ -750,10 +750,18 @@ static long wb_writeback(struct bdi_writeback *wb,
wrote += MAX_WRITEBACK_PAGES - wbc.nr_to_write; wrote += MAX_WRITEBACK_PAGES - wbc.nr_to_write;
/* /*
* If we ran out of stuff to write, bail unless more_io got set * If we consumed everything, see if we have more
*/
if (wbc.nr_to_write <= 0)
continue;
/*
* Didn't write everything and we don't have more IO, bail
*/
if (!wbc.more_io)
break;
/*
* Did we write something? Try for more
*/ */
if (wbc.nr_to_write > 0) {
if (wbc.more_io) {
if (wbc.nr_to_write < MAX_WRITEBACK_PAGES) if (wbc.nr_to_write < MAX_WRITEBACK_PAGES)
continue; continue;
/* /*
@@ -763,16 +771,11 @@ static long wb_writeback(struct bdi_writeback *wb,
*/ */
spin_lock(&inode_lock); spin_lock(&inode_lock);
if (!list_empty(&wb->b_more_io)) { if (!list_empty(&wb->b_more_io)) {
inode = list_entry( inode = list_entry(wb->b_more_io.prev,
wb->b_more_io.prev,
struct inode, i_list); struct inode, i_list);
inode_wait_for_writeback(inode); inode_wait_for_writeback(inode);
} }
spin_unlock(&inode_lock); spin_unlock(&inode_lock);
continue;
}
break;
}
} }
return wrote; return wrote;