This is a note to let you know that I've just added the patch titled
bcache: Fix dirty_data accounting
to the 3.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
bcache-fix-dirty_data-accounting.patch
and it can be found in the queue-3.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1fa8455deb92e9ec7756df23030e73b2d28eeca7 Mon Sep 17 00:00:00 2001
From: Kent Overstreet <kmo@xxxxxxxxxxxxx>
Date: Sun, 10 Nov 2013 21:55:27 -0800
Subject: bcache: Fix dirty_data accounting
From: Kent Overstreet <kmo@xxxxxxxxxxxxx>
commit 1fa8455deb92e9ec7756df23030e73b2d28eeca7 upstream.
Dirty data accounting wasn't quite right - firstly, we were adding the key we're
inserting after it could have merged with another dirty key already in the
btree, and secondly we could sometimes pass the wrong offset to
bcache_dev_sectors_dirty_add() for dirty data we were overwriting - which is
important when tracking dirty data by stripe.
Signed-off-by: Kent Overstreet <kmo@xxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/md/bcache/btree.c | 11 +++++++----
1 file changed, 7 insertions(+), 4 deletions(-)
--- a/drivers/md/bcache/btree.c
+++ b/drivers/md/bcache/btree.c
@@ -1742,6 +1742,9 @@ static bool fix_overlapping_extents(stru
if (bkey_cmp(insert, k) < 0) {
bch_cut_front(insert, k);
} else {
+ if (bkey_cmp(&START_KEY(insert), &START_KEY(k)) > 0)
+ old_offset = KEY_START(insert);
+
if (bkey_written(b, k) &&
bkey_cmp(&START_KEY(insert), &START_KEY(k)) <= 0) {
/*
@@ -1803,6 +1806,10 @@ static bool btree_insert_key(struct btre
if (fix_overlapping_extents(b, k, &iter, op))
return false;
+ if (KEY_DIRTY(k))
+ bcache_dev_sectors_dirty_add(b->c, KEY_INODE(k),
+ KEY_START(k), KEY_SIZE(k));
+
while (m != end(i) &&
bkey_cmp(k, &START_KEY(m)) > 0)
prev = m, m = bkey_next(m);
@@ -1831,10 +1838,6 @@ static bool btree_insert_key(struct btre
insert: shift_keys(b, m, k);
copy: bkey_copy(m, k);
merged:
- if (KEY_DIRTY(k))
- bcache_dev_sectors_dirty_add(b->c, KEY_INODE(k),
- KEY_START(k), KEY_SIZE(k));
-
bch_check_keys(b, "%u for %s", status, op_type(op));
if (b->level && !KEY_OFFSET(k))
Patches currently in stable-queue which might be from kmo@xxxxxxxxxxxxx are
queue-3.12/bcache-fix-dirty_data-accounting.patch
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