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Commit c3d9714e authored by NeilBrown's avatar NeilBrown
Browse files

md: collect bitmap-specific fields into one structure. 



In preparation for making bitmap fields configurable via sysfs,
start tidying up by making a single structure to contain the
configuration fields.

Signed-off-by: default avatarNeilBrown <neilb@suse.de>
parent 709ae487

drivers/md/bitmap.c

+9 −9
Original line number Diff line number Diff line
@@ -1090,10 +1090,10 @@ void bitmap_daemon_work(mddev_t *mddev) 
	/* Use a mutex to guard daemon_work against

	 * bitmap_destroy.

	 */

	mutex_lock(&mddev->bitmap_mutex);

	mutex_lock(&mddev->bitmap_info.mutex);

	bitmap = mddev->bitmap;

	if (bitmap == NULL) {

		mutex_unlock(&mddev->bitmap_mutex);

		mutex_unlock(&mddev->bitmap_info.mutex);

		return;

	}

	if (time_before(jiffies, bitmap->daemon_lastrun + bitmap->daemon_sleep*HZ))
@@ -1211,7 +1211,7 @@ void bitmap_daemon_work(mddev_t *mddev) 
 done:

	if (bitmap->allclean == 0)

		bitmap->mddev->thread->timeout = bitmap->daemon_sleep * HZ;

	mutex_unlock(&mddev->bitmap_mutex);

	mutex_unlock(&mddev->bitmap_info.mutex);

}



static bitmap_counter_t *bitmap_get_counter(struct bitmap *bitmap,
@@ -1591,9 +1591,9 @@ void bitmap_destroy(mddev_t *mddev) 
	if (!bitmap) /* there was no bitmap */

		return;



	mutex_lock(&mddev->bitmap_mutex);

	mutex_lock(&mddev->bitmap_info.mutex);

	mddev->bitmap = NULL; /* disconnect from the md device */

	mutex_unlock(&mddev->bitmap_mutex);

	mutex_unlock(&mddev->bitmap_info.mutex);

	if (mddev->thread)

		mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT;
@@ -1610,16 +1610,16 @@ int bitmap_create(mddev_t *mddev) 
	sector_t blocks = mddev->resync_max_sectors;

	unsigned long chunks;

	unsigned long pages;

	struct file *file = mddev->bitmap_file;

	struct file *file = mddev->bitmap_info.file;

	int err;

	sector_t start;



	BUILD_BUG_ON(sizeof(bitmap_super_t) != 256);



	if (!file && !mddev->bitmap_offset) /* bitmap disabled, nothing to do */

	if (!file && !mddev->bitmap_info.offset) /* bitmap disabled, nothing to do */

		return 0;



	BUG_ON(file && mddev->bitmap_offset);

	BUG_ON(file && mddev->bitmap_info.offset);



	bitmap = kzalloc(sizeof(*bitmap), GFP_KERNEL);

	if (!bitmap)
@@ -1633,7 +1633,7 @@ int bitmap_create(mddev_t *mddev) 
	bitmap->mddev = mddev;



	bitmap->file = file;

	bitmap->offset = mddev->bitmap_offset;

	bitmap->offset = mddev->bitmap_info.offset;

	if (file) {

		get_file(file);

		/* As future accesses to this file will use bmap,

drivers/md/md.c

+42 −37
Original line number Diff line number Diff line
@@ -463,7 +463,7 @@ static mddev_t * mddev_find(dev_t unit) 


	mutex_init(&new->open_mutex);

	mutex_init(&new->reconfig_mutex);

	mutex_init(&new->bitmap_mutex);

	mutex_init(&new->bitmap_info.mutex);

	INIT_LIST_HEAD(&new->disks);

	INIT_LIST_HEAD(&new->all_mddevs);

	init_timer(&new->safemode_timer);
@@ -850,7 +850,7 @@ struct super_type { 
 */

int md_check_no_bitmap(mddev_t *mddev)

{

	if (!mddev->bitmap_file && !mddev->bitmap_offset)

	if (!mddev->bitmap_info.file && !mddev->bitmap_info.offset)

		return 0;

	printk(KERN_ERR "%s: bitmaps are not supported for %s\n",

		mdname(mddev), mddev->pers->name);
@@ -978,8 +978,8 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) 
		mddev->raid_disks = sb->raid_disks;

		mddev->dev_sectors = sb->size * 2;

		mddev->events = ev1;

		mddev->bitmap_offset = 0;

		mddev->default_bitmap_offset = MD_SB_BYTES >> 9;

		mddev->bitmap_info.offset = 0;

		mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;



		if (mddev->minor_version >= 91) {

			mddev->reshape_position = sb->reshape_position;
@@ -1013,8 +1013,9 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) 
		mddev->max_disks = MD_SB_DISKS;



		if (sb->state & (1<<MD_SB_BITMAP_PRESENT) &&

		    mddev->bitmap_file == NULL)

			mddev->bitmap_offset = mddev->default_bitmap_offset;

		    mddev->bitmap_info.file == NULL)

			mddev->bitmap_info.offset =

				mddev->bitmap_info.default_offset;



	} else if (mddev->pers == NULL) {

		/* Insist on good event counter while assembling */
@@ -1131,7 +1132,7 @@ static void super_90_sync(mddev_t *mddev, mdk_rdev_t *rdev) 
	sb->layout = mddev->layout;

	sb->chunk_size = mddev->chunk_sectors << 9;



	if (mddev->bitmap && mddev->bitmap_file == NULL)

	if (mddev->bitmap && mddev->bitmap_info.file == NULL)

		sb->state |= (1<<MD_SB_BITMAP_PRESENT);



	sb->disks[0].state = (1<<MD_DISK_REMOVED);
@@ -1209,7 +1210,7 @@ super_90_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) 
{

	if (num_sectors && num_sectors < rdev->mddev->dev_sectors)

		return 0; /* component must fit device */

	if (rdev->mddev->bitmap_offset)

	if (rdev->mddev->bitmap_info.offset)

		return 0; /* can't move bitmap */

	rdev->sb_start = calc_dev_sboffset(rdev->bdev);

	if (!num_sectors || num_sectors > rdev->sb_start)
@@ -1388,8 +1389,8 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) 
		mddev->raid_disks = le32_to_cpu(sb->raid_disks);

		mddev->dev_sectors = le64_to_cpu(sb->size);

		mddev->events = ev1;

		mddev->bitmap_offset = 0;

		mddev->default_bitmap_offset = 1024 >> 9;

		mddev->bitmap_info.offset = 0;

		mddev->bitmap_info.default_offset = 1024 >> 9;

		

		mddev->recovery_cp = le64_to_cpu(sb->resync_offset);

		memcpy(mddev->uuid, sb->set_uuid, 16);
@@ -1397,8 +1398,9 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) 
		mddev->max_disks =  (4096-256)/2;



		if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_BITMAP_OFFSET) &&

		    mddev->bitmap_file == NULL )

			mddev->bitmap_offset = (__s32)le32_to_cpu(sb->bitmap_offset);

		    mddev->bitmap_info.file == NULL )

			mddev->bitmap_info.offset =

				(__s32)le32_to_cpu(sb->bitmap_offset);



		if ((le32_to_cpu(sb->feature_map) & MD_FEATURE_RESHAPE_ACTIVE)) {

			mddev->reshape_position = le64_to_cpu(sb->reshape_position);
@@ -1492,8 +1494,8 @@ static void super_1_sync(mddev_t *mddev, mdk_rdev_t *rdev) 
	sb->level = cpu_to_le32(mddev->level);

	sb->layout = cpu_to_le32(mddev->layout);



	if (mddev->bitmap && mddev->bitmap_file == NULL) {

		sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_offset);

	if (mddev->bitmap && mddev->bitmap_info.file == NULL) {

		sb->bitmap_offset = cpu_to_le32((__u32)mddev->bitmap_info.offset);

		sb->feature_map = cpu_to_le32(MD_FEATURE_BITMAP_OFFSET);

	}
@@ -1560,7 +1562,7 @@ super_1_rdev_size_change(mdk_rdev_t *rdev, sector_t num_sectors) 
		max_sectors -= rdev->data_offset;

		if (!num_sectors || num_sectors > max_sectors)

			num_sectors = max_sectors;

	} else if (rdev->mddev->bitmap_offset) {

	} else if (rdev->mddev->bitmap_info.offset) {

		/* minor version 0 with bitmap we can't move */

		return 0;

	} else {
@@ -4507,12 +4509,12 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open) 
		printk(KERN_INFO "md: %s stopped.\n", mdname(mddev));



		bitmap_destroy(mddev);

		if (mddev->bitmap_file) {

			restore_bitmap_write_access(mddev->bitmap_file);

			fput(mddev->bitmap_file);

			mddev->bitmap_file = NULL;

		if (mddev->bitmap_info.file) {

			restore_bitmap_write_access(mddev->bitmap_info.file);

			fput(mddev->bitmap_info.file);

			mddev->bitmap_info.file = NULL;

		}

		mddev->bitmap_offset = 0;

		mddev->bitmap_info.offset = 0;



		/* make sure all md_delayed_delete calls have finished */

		flush_scheduled_work();
@@ -4553,6 +4555,8 @@ static int do_md_stop(mddev_t * mddev, int mode, int is_open) 
		mddev->degraded = 0;

		mddev->barriers_work = 0;

		mddev->safemode = 0;

		mddev->bitmap_info.offset = 0;

		mddev->bitmap_info.default_offset = 0;

		kobject_uevent(&disk_to_dev(mddev->gendisk)->kobj, KOBJ_CHANGE);

		if (mddev->hold_active == UNTIL_STOP)

			mddev->hold_active = 0;
@@ -4738,7 +4742,7 @@ static int get_array_info(mddev_t * mddev, void __user * arg) 
	info.state         = 0;

	if (mddev->in_sync)

		info.state = (1<<MD_SB_CLEAN);

	if (mddev->bitmap && mddev->bitmap_offset)

	if (mddev->bitmap && mddev->bitmap_info.offset)

		info.state = (1<<MD_SB_BITMAP_PRESENT);

	info.active_disks  = insync;

	info.working_disks = working;
@@ -5096,23 +5100,23 @@ static int set_bitmap_file(mddev_t *mddev, int fd) 
	if (fd >= 0) {

		if (mddev->bitmap)

			return -EEXIST; /* cannot add when bitmap is present */

		mddev->bitmap_file = fget(fd);

		mddev->bitmap_info.file = fget(fd);



		if (mddev->bitmap_file == NULL) {

		if (mddev->bitmap_info.file == NULL) {

			printk(KERN_ERR "%s: error: failed to get bitmap file\n",

			       mdname(mddev));

			return -EBADF;

		}



		err = deny_bitmap_write_access(mddev->bitmap_file);

		err = deny_bitmap_write_access(mddev->bitmap_info.file);

		if (err) {

			printk(KERN_ERR "%s: error: bitmap file is already in use\n",

			       mdname(mddev));

			fput(mddev->bitmap_file);

			mddev->bitmap_file = NULL;

			fput(mddev->bitmap_info.file);

			mddev->bitmap_info.file = NULL;

			return err;

		}

		mddev->bitmap_offset = 0; /* file overrides offset */

		mddev->bitmap_info.offset = 0; /* file overrides offset */

	} else if (mddev->bitmap == NULL)

		return -ENOENT; /* cannot remove what isn't there */

	err = 0;
@@ -5127,11 +5131,11 @@ static int set_bitmap_file(mddev_t *mddev, int fd) 
		mddev->pers->quiesce(mddev, 0);

	}

	if (fd < 0) {

		if (mddev->bitmap_file) {

			restore_bitmap_write_access(mddev->bitmap_file);

			fput(mddev->bitmap_file);

		if (mddev->bitmap_info.file) {

			restore_bitmap_write_access(mddev->bitmap_info.file);

			fput(mddev->bitmap_info.file);

		}

		mddev->bitmap_file = NULL;

		mddev->bitmap_info.file = NULL;

	}



	return err;
@@ -5198,8 +5202,8 @@ static int set_array_info(mddev_t * mddev, mdu_array_info_t *info) 
		mddev->flags         = 0;

	set_bit(MD_CHANGE_DEVS, &mddev->flags);



	mddev->default_bitmap_offset = MD_SB_BYTES >> 9;

	mddev->bitmap_offset = 0;

	mddev->bitmap_info.default_offset = MD_SB_BYTES >> 9;

	mddev->bitmap_info.offset = 0;



	mddev->reshape_position = MaxSector;
@@ -5299,7 +5303,7 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) 
	int state = 0;



	/* calculate expected state,ignoring low bits */

	if (mddev->bitmap && mddev->bitmap_offset)

	if (mddev->bitmap && mddev->bitmap_info.offset)

		state |= (1 << MD_SB_BITMAP_PRESENT);



	if (mddev->major_version != info->major_version ||
@@ -5358,9 +5362,10 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) 
			/* add the bitmap */

			if (mddev->bitmap)

				return -EEXIST;

			if (mddev->default_bitmap_offset == 0)

			if (mddev->bitmap_info.default_offset == 0)

				return -EINVAL;

			mddev->bitmap_offset = mddev->default_bitmap_offset;

			mddev->bitmap_info.offset =

				mddev->bitmap_info.default_offset;

			mddev->pers->quiesce(mddev, 1);

			rv = bitmap_create(mddev);

			if (rv)
@@ -5375,7 +5380,7 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) 
			mddev->pers->quiesce(mddev, 1);

			bitmap_destroy(mddev);

			mddev->pers->quiesce(mddev, 0);

			mddev->bitmap_offset = 0;

			mddev->bitmap_info.offset = 0;

		}

	}

	md_update_sb(mddev, 1);

drivers/md/md.h

+12 −10
Original line number Diff line number Diff line
@@ -280,16 +280,18 @@ struct mddev_s 
	unsigned int                    max_write_behind; /* 0 = sync */



	struct bitmap                   *bitmap; /* the bitmap for the device */

	struct file			*bitmap_file; /* the bitmap file */

	long				bitmap_offset; /* offset from superblock of

	struct {

		struct file		*file; /* the bitmap file */

		long			offset; /* offset from superblock of

						 * start of bitmap. May be

						 * negative, but not '0'

						 */

	long				default_bitmap_offset; /* this is the offset to use when

		long			default_offset; /* this is the offset to use when

							 * hot-adding a bitmap.  It should

							 * eventually be settable by sysfs.

							 */

	struct mutex			bitmap_mutex;

		struct mutex		mutex;

	} bitmap_info;



	struct list_head		all_mddevs;