diff options
Diffstat (limited to 'fs/fs-writeback.c')
| -rw-r--r-- | fs/fs-writeback.c | 43 |
1 files changed, 10 insertions, 33 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c index 863bfb0eb492..8a5807d2fb9d 100644 --- a/fs/fs-writeback.c +++ b/fs/fs-writeback.c @@ -374,45 +374,22 @@ writeback_single_inode(struct inode *inode, struct writeback_control *wbc) if (mapping_tagged(mapping, PAGECACHE_TAG_DIRTY)) { /* * We didn't write back all the pages. nfs_writepages() - * sometimes bales out without doing anything. Redirty - * the inode; Move it from b_io onto b_more_io/b_dirty. + * sometimes bales out without doing anything. */ - /* - * akpm: if the caller was the kupdate function we put - * this inode at the head of b_dirty so it gets first - * consideration. Otherwise, move it to the tail, for - * the reasons described there. I'm not really sure - * how much sense this makes. Presumably I had a good - * reasons for doing it this way, and I'd rather not - * muck with it at present. - */ - if (wbc->for_kupdate) { + inode->i_state |= I_DIRTY_PAGES; + if (wbc->nr_to_write <= 0) { /* - * For the kupdate function we move the inode - * to b_more_io so it will get more writeout as - * soon as the queue becomes uncongested. + * slice used up: queue for next turn */ - inode->i_state |= I_DIRTY_PAGES; - if (wbc->nr_to_write <= 0) { - /* - * slice used up: queue for next turn - */ - requeue_io(inode); - } else { - /* - * somehow blocked: retry later - */ - redirty_tail(inode); - } + requeue_io(inode); } else { /* - * Otherwise fully redirty the inode so that - * other inodes on this superblock will get some - * writeout. Otherwise heavy writing to one - * file would indefinitely suspend writeout of - * all the other files. + * Writeback blocked by something other than + * congestion. Delay the inode for some time to + * avoid spinning on the CPU (100% iowait) + * retrying writeback of the dirty page/inode + * that cannot be performed immediately. */ - inode->i_state |= I_DIRTY_PAGES; redirty_tail(inode); } } else if (inode->i_state & I_DIRTY) { |