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| author | NeilBrown <neilb@suse.de> | 2008-07-21 17:05:25 +1000 |
|---|---|---|
| committer | NeilBrown <neilb@suse.de> | 2008-07-21 17:05:25 +1000 |
| commit | f2ea68cf42aafdd93393b6b8b20fc3c2b5f4390c (patch) | |
| tree | 00b025b91898ff32dba742b5075dd290fec4dc91 /include/linux/raid | |
| parent | d6e2215052810678bc9782fd980b52706fc71f50 (diff) | |
| download | lwn-f2ea68cf42aafdd93393b6b8b20fc3c2b5f4390c.tar.gz lwn-f2ea68cf42aafdd93393b6b8b20fc3c2b5f4390c.zip | |
md: only count actual openers as access which prevent a 'stop'
Open isn't the only thing that increments ->active. e.g. reading
/proc/mdstat will increment it briefly. So to avoid false positives
in testing for concurrent access, introduce a new counter that counts
just the number of times the md device it open.
Signed-off-by: NeilBrown <neilb@suse.de>
Diffstat (limited to 'include/linux/raid')
| -rw-r--r-- | include/linux/raid/md_k.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h index 6f72b47ae41c..4bef4791d80d 100644 --- a/include/linux/raid/md_k.h +++ b/include/linux/raid/md_k.h @@ -215,7 +215,8 @@ struct mddev_s int in_sync; /* know to not need resync */ struct mutex reconfig_mutex; - atomic_t active; + atomic_t active; /* general refcount */ + atomic_t openers; /* number of active opens */ int changed; /* true if we might need to reread partition info */ int degraded; /* whether md should consider |