From: Chao Yu Date: Fri, 28 Feb 2014 02:12:05 +0000 (+0800) Subject: f2fs: fix dirty page accounting when redirty X-Git-Tag: v4.14-rc1~7734^2~36 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=9cf3c3898a274ca637b88ad01b0830550ee2d318;p=platform%2Fkernel%2Flinux-rpi.git f2fs: fix dirty page accounting when redirty We should de-account dirty counters for page when redirty in ->writepage(). Wu Fengguang described in 'commit 971767caf632190f77a40b4011c19948232eed75': "writeback: fix dirtied pages accounting on redirty De-account the accumulative dirty counters on page redirty. Page redirties (very common in ext4) will introduce mismatch between counters (a) and (b) a) NR_DIRTIED, BDI_DIRTIED, tsk->nr_dirtied b) NR_WRITTEN, BDI_WRITTEN This will introduce systematic errors in balanced_rate and result in dirty page position errors (ie. the dirty pages are no longer balanced around the global/bdi setpoints)." Signed-off-by: Chao Yu Signed-off-by: Jaegeuk Kim --- diff --git a/fs/f2fs/checkpoint.c b/fs/f2fs/checkpoint.c index c8516ee..f069249 100644 --- a/fs/f2fs/checkpoint.c +++ b/fs/f2fs/checkpoint.c @@ -178,6 +178,7 @@ no_write: redirty_out: dec_page_count(sbi, F2FS_DIRTY_META); wbc->pages_skipped++; + account_page_redirty(page); set_page_dirty(page); return AOP_WRITEPAGE_ACTIVATE; } diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index 93d80ea..101b4cd4 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -839,6 +839,7 @@ out: redirty_out: wbc->pages_skipped++; + account_page_redirty(page); set_page_dirty(page); return AOP_WRITEPAGE_ACTIVATE; } diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 1f9cf21..8c14110 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -1193,6 +1193,7 @@ static int f2fs_write_node_page(struct page *page, redirty_out: dec_page_count(sbi, F2FS_DIRTY_NODES); wbc->pages_skipped++; + account_page_redirty(page); set_page_dirty(page); return AOP_WRITEPAGE_ACTIVATE; }