diff options
| author | James Morris <jmorris@namei.org> | 2009-08-20 09:18:42 +1000 |
|---|---|---|
| committer | James Morris <jmorris@namei.org> | 2009-08-20 09:18:42 +1000 |
| commit | ece13879e74313e62109e0755dd3d4f172df89e2 (patch) | |
| tree | 1fe96ab392c1ff203a6fb3f67ed0ed577056572e /drivers/md/md.h | |
| parent | b08dc3eba0c34027010caeda258f495074ae3a54 (diff) | |
| parent | 6c30c53fd5ae6a99a23ad78e90c428d2c8ffb07f (diff) | |
Merge branch 'master' into next
Conflicts:
security/Kconfig
Manual fix.
Signed-off-by: James Morris <jmorris@namei.org>
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 78f03168baf..f8fc188bc76 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 */ |