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author | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-10 15:38:19 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2010-08-10 15:38:19 -0700 |
commit | 3d30701b58970425e1d45994d6cb82f828924fdd (patch) | |
tree | 8b14cf462628bebf8548c1b8c205a674564052d1 /drivers/md/md.h | |
parent | 8cbd84f2dd4e52a8771b191030c374ba3e56d291 (diff) | |
parent | fd8aa2c1811bf60ccb2d5de0579c6f62aec1772d (diff) | |
download | linux-3.10-3d30701b58970425e1d45994d6cb82f828924fdd.tar.gz linux-3.10-3d30701b58970425e1d45994d6cb82f828924fdd.tar.bz2 linux-3.10-3d30701b58970425e1d45994d6cb82f828924fdd.zip |
Merge branch 'for-linus' of git://neil.brown.name/md
* 'for-linus' of git://neil.brown.name/md: (24 commits)
md: clean up do_md_stop
md: fix another deadlock with removing sysfs attributes.
md: move revalidate_disk() back outside open_mutex
md/raid10: fix deadlock with unaligned read during resync
md/bitmap: separate out loading a bitmap from initialising the structures.
md/bitmap: prepare for storing write-intent-bitmap via dm-dirty-log.
md/bitmap: optimise scanning of empty bitmaps.
md/bitmap: clean up plugging calls.
md/bitmap: reduce dependence on sysfs.
md/bitmap: white space clean up and similar.
md/raid5: export raid5 unplugging interface.
md/plug: optionally use plugger to unplug an array during resync/recovery.
md/raid5: add simple plugging infrastructure.
md/raid5: export is_congested test
raid5: Don't set read-ahead when there is no queue
md: add support for raising dm events.
md: export various start/stop interfaces
md: split out md_rdev_init
md: be more careful setting MD_CHANGE_CLEAN
md/raid5: ensure we create a unique name for kmem_cache when mddev has no gendisk
...
Diffstat (limited to 'drivers/md/md.h')
-rw-r--r-- | drivers/md/md.h | 55 |
1 files changed, 54 insertions, 1 deletions
diff --git a/drivers/md/md.h b/drivers/md/md.h index fc56e0f21c8..a953fe2808a 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 */ @@ -125,6 +145,10 @@ struct mddev_s 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; @@ -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 */ |