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| author | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2011-05-31 07:03:21 +0300 |
|---|---|---|
| committer | Andi Kleen <ak@linux.intel.com> | 2011-08-01 13:54:54 -0700 |
| commit | 6093240b06916ca21216bb4728f79b264fd08e30 (patch) | |
| tree | 5d0ce67fdbd3b64c1be10ae346f7e0fa269eda95 | |
| parent | 6f0a1a45a8ed6c59710605fc763a5d3515a4324a (diff) | |
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>
Signed-off-by: Andi Kleen <ak@linux.intel.com>
| -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 0b201114a5ad..5306c9195ed8 100644 --- a/fs/ubifs/shrinker.c +++ b/fs/ubifs/shrinker.c @@ -283,7 +283,11 @@ int ubifs_shrinker(struct shrinker *shrink, 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) { /* |