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authorDavid S. Miller <davem@davemloft.net>2010-09-08 23:49:04 -0700
committerDavid S. Miller <davem@davemloft.net>2010-09-08 23:49:04 -0700
commite199e6136ce6b151e6638ae93dca60748424d900 (patch)
tree0d66e0b5d227c36b005e4f5537f4bbcfc6ed4904 /drivers/md/md.h
parent972c40b5bee429c84ba727f8ac0a08292bc5dc3d (diff)
parentd56557af19867edb8c0e96f8e26399698a08857f (diff)
Merge branch 'master' of master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'drivers/md/md.h')
-rw-r--r--drivers/md/md.h61
1 files changed, 57 insertions, 4 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h
index 10597bfec00..3931299788d 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -29,6 +29,26 @@
typedef struct mddev_s mddev_t;
typedef struct mdk_rdev_s mdk_rdev_t;
+/* generic plugging support - like that provided with request_queue,
+ * but does not require a request_queue
+ */
+struct plug_handle {
+ void (*unplug_fn)(struct plug_handle *);
+ struct timer_list unplug_timer;
+ struct work_struct unplug_work;
+ unsigned long unplug_flag;
+};
+#define PLUGGED_FLAG 1
+void plugger_init(struct plug_handle *plug,
+ void (*unplug_fn)(struct plug_handle *));
+void plugger_set_plug(struct plug_handle *plug);
+int plugger_remove_plug(struct plug_handle *plug);
+static inline void plugger_flush(struct plug_handle *plug)
+{
+ del_timer_sync(&plug->unplug_timer);
+ cancel_work_sync(&plug->unplug_work);
+}
+
/*
* MD's 'extended' device
*/
@@ -67,7 +87,7 @@ struct mdk_rdev_s
#define Faulty 1 /* device is known to have a fault */
#define In_sync 2 /* device is in_sync with rest of array */
#define WriteMostly 4 /* Avoid reading if at all possible */
-#define BarriersNotsupp 5 /* BIO_RW_BARRIER is not supported */
+#define BarriersNotsupp 5 /* REQ_HARDBARRIER is not supported */
#define AllReserved 6 /* If whole device is reserved for
* one array */
#define AutoDetected 7 /* added by auto-detect */
@@ -120,11 +140,15 @@ struct mddev_s
unsigned long flags;
#define MD_CHANGE_DEVS 0 /* Some device status has changed */
#define MD_CHANGE_CLEAN 1 /* transition to or from 'clean' */
-#define MD_CHANGE_PENDING 2 /* superblock update in progress */
+#define MD_CHANGE_PENDING 2 /* switch from 'clean' to 'active' in progress */
int suspended;
atomic_t active_io;
int ro;
+ int sysfs_active; /* set when sysfs deletes
+ * are happening, so run/
+ * takeover/stop are not safe
+ */
struct gendisk *gendisk;
@@ -254,7 +278,7 @@ struct mddev_s
* fails. Only supported
*/
struct bio *biolist; /* bios that need to be retried
- * because BIO_RW_BARRIER is not supported
+ * because REQ_HARDBARRIER is not supported
*/
atomic_t recovery_active; /* blocks scheduled, but not written */
@@ -297,9 +321,14 @@ struct mddev_s
* hot-adding a bitmap. It should
* eventually be settable by sysfs.
*/
+ /* When md is serving under dm, it might use a
+ * dirty_log to store the bits.
+ */
+ struct dm_dirty_log *log;
+
struct mutex mutex;
unsigned long chunksize;
- unsigned long daemon_sleep; /* how many seconds between updates? */
+ unsigned long daemon_sleep; /* how many jiffies between updates? */
unsigned long max_write_behind; /* write-behind mode */
int external;
} bitmap_info;
@@ -308,6 +337,8 @@ struct mddev_s
struct list_head all_mddevs;
struct attribute_group *to_remove;
+ struct plug_handle *plug; /* if used by personality */
+
/* Generic barrier handling.
* If there is a pending barrier request, all other
* writes are blocked while the devices are flushed.
@@ -318,6 +349,7 @@ struct mddev_s
struct bio *barrier;
atomic_t flush_pending;
struct work_struct barrier_work;
+ struct work_struct event_work; /* used by dm to report failure event */
};
@@ -382,6 +414,18 @@ struct md_sysfs_entry {
};
extern struct attribute_group md_bitmap_group;
+static inline struct sysfs_dirent *sysfs_get_dirent_safe(struct sysfs_dirent *sd, char *name)
+{
+ if (sd)
+ return sysfs_get_dirent(sd, NULL, name);
+ return sd;
+}
+static inline void sysfs_notify_dirent_safe(struct sysfs_dirent *sd)
+{
+ if (sd)
+ sysfs_notify_dirent(sd);
+}
+
static inline char * mdname (mddev_t * mddev)
{
return mddev->gendisk ? mddev->gendisk->disk_name : "mdX";
@@ -474,5 +518,14 @@ extern int md_integrity_register(mddev_t *mddev);
extern void md_integrity_add_rdev(mdk_rdev_t *rdev, mddev_t *mddev);
extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale);
extern void restore_bitmap_write_access(struct file *file);
+extern void md_unplug(mddev_t *mddev);
+
+extern void mddev_init(mddev_t *mddev);
+extern int md_run(mddev_t *mddev);
+extern void md_stop(mddev_t *mddev);
+extern void md_stop_writes(mddev_t *mddev);
+extern void md_rdev_init(mdk_rdev_t *rdev);
+extern void mddev_suspend(mddev_t *mddev);
+extern void mddev_resume(mddev_t *mddev);
#endif /* _MD_MD_H */