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| author | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2011-05-31 07:03:21 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2011-06-23 15:24:05 -0700 |
| commit | 439aa7dfce5dd2afdc2a9d669d0b147f1a9d8f4f (patch) | |
| tree | c0c605c4d37c1750d3795f3d184150c42e00a3ce /fs | |
| parent | 8b75b31813ea2929108ab0bf963feb9459f16992 (diff) | |
| download | lwn-439aa7dfce5dd2afdc2a9d669d0b147f1a9d8f4f.tar.gz lwn-439aa7dfce5dd2afdc2a9d669d0b147f1a9d8f4f.zip | |
UBIFS: fix shrinker object count reports
commit cf610bf4199770420629d3bc273494bd27ad6c1d upstream.
Sometimes VM asks the shrinker to return amount of objects it can shrink,
and we return the ubifs_clean_zn_cnt in that case. However, it is possible
that this counter is negative for a short period of time, due to the way
UBIFS TNC code updates it. And I can observe the following warnings sometimes:
shrink_slab: ubifs_shrinker+0x0/0x2b7 [ubifs] negative objects to delete nr=-8541616642706119788
This patch makes sure UBIFS never returns negative count of objects.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/ubifs/shrinker.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/fs/ubifs/shrinker.c b/fs/ubifs/shrinker.c index 02feb59cefca..aec66890388c 100644 --- a/fs/ubifs/shrinker.c +++ b/fs/ubifs/shrinker.c @@ -283,7 +283,11 @@ int ubifs_shrinker(int nr, gfp_t gfp_mask) long clean_zn_cnt = atomic_long_read(&ubifs_clean_zn_cnt); if (nr == 0) - return clean_zn_cnt; + /* + * Due to the way UBIFS updates the clean znode counter it may + * temporarily be negative. + */ + return clean_zn_cnt >= 0 ? clean_zn_cnt : 1; if (!clean_zn_cnt) { /* |