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| author | Trond Myklebust <Trond.Myklebust@netapp.com> | 2009-08-19 18:21:52 -0400 |
|---|---|---|
| committer | Trond Myklebust <Trond.Myklebust@netapp.com> | 2009-08-19 18:21:52 -0400 |
| commit | 6a396f67d2442e30150ffb5e1142dbb2f2181d3f (patch) | |
| tree | 2ea4f3ab1d3766204a55ec26600b848ed3a7e8aa /drivers/md/md.h | |
| parent | f884dcaead5f17bf586ac5fe6a3ad07b5203616a (diff) | |
| parent | cccddf4f5580131c9b963900e1d3400655e633cc (diff) | |
Merge branch 'nfsv4_xdr_cleanups-for-2.6.32' into nfs-for-2.6.32
Conflicts:
fs/nfs/nfs4xdr.c
Diffstat (limited to 'drivers/md/md.h')
| -rw-r--r-- | drivers/md/md.h | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h index 78f03168baf9..f8fc188bc762 100644 --- a/drivers/md/md.h +++ b/drivers/md/md.h @@ -223,6 +223,16 @@ struct mddev_s * so we don't loop trying */ int in_sync; /* know to not need resync */ + /* 'open_mutex' avoids races between 'md_open' and 'do_md_stop', so + * that we are never stopping an array while it is open. + * 'reconfig_mutex' protects all other reconfiguration. + * These locks are separate due to conflicting interactions + * with bdev->bd_mutex. + * Lock ordering is: + * reconfig_mutex -> bd_mutex : e.g. do_md_run -> revalidate_disk + * bd_mutex -> open_mutex: e.g. __blkdev_get -> md_open + */ + struct mutex open_mutex; struct mutex reconfig_mutex; atomic_t active; /* general refcount */ atomic_t openers; /* number of active opens */ |