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| author | Shaohua Li <shaohua.li@intel.com> | 2011-03-22 08:35:35 +0100 |
|---|---|---|
| committer | Jens Axboe <jaxboe@fusionio.com> | 2011-03-22 08:35:35 +0100 |
| commit | 1e9bb8808ac11094d711d20d580e7b45a4992d0c (patch) | |
| tree | d0e228b619664b7f507e37e5eba4a5ebeef103a0 /include/linux/genhd.h | |
| parent | 5e84ea3a9c662dc2d7a48703a4468fad954a3b7f (diff) | |
| download | lwn-1e9bb8808ac11094d711d20d580e7b45a4992d0c.tar.gz lwn-1e9bb8808ac11094d711d20d580e7b45a4992d0c.zip | |
block: fix non-atomic access to genhd inflight structures
After the stack plugging introduction, these are called lockless.
Ensure that the counters are updated atomically.
Signed-off-by: Shaohua Li<shaohua.li@intel.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Diffstat (limited to 'include/linux/genhd.h')
| -rw-r--r-- | include/linux/genhd.h | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/include/linux/genhd.h b/include/linux/genhd.h index c0d5f6945c1e..d764a426e9fd 100644 --- a/include/linux/genhd.h +++ b/include/linux/genhd.h @@ -109,7 +109,7 @@ struct hd_struct { int make_it_fail; #endif unsigned long stamp; - int in_flight[2]; + atomic_t in_flight[2]; #ifdef CONFIG_SMP struct disk_stats __percpu *dkstats; #else @@ -370,21 +370,21 @@ static inline void free_part_stats(struct hd_struct *part) static inline void part_inc_in_flight(struct hd_struct *part, int rw) { - part->in_flight[rw]++; + atomic_inc(&part->in_flight[rw]); if (part->partno) - part_to_disk(part)->part0.in_flight[rw]++; + atomic_inc(&part_to_disk(part)->part0.in_flight[rw]); } static inline void part_dec_in_flight(struct hd_struct *part, int rw) { - part->in_flight[rw]--; + atomic_dec(&part->in_flight[rw]); if (part->partno) - part_to_disk(part)->part0.in_flight[rw]--; + atomic_dec(&part_to_disk(part)->part0.in_flight[rw]); } static inline int part_in_flight(struct hd_struct *part) { - return part->in_flight[0] + part->in_flight[1]; + return atomic_read(&part->in_flight[0]) + atomic_read(&part->in_flight[1]); } static inline struct partition_meta_info *alloc_part_info(struct gendisk *disk) |