From: NeilBrown Date: Fri, 9 Sep 2005 23:23:45 +0000 (-0700) Subject: [PATCH] md: all hot-add and hot-remove of md intent logging bitmaps X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=36fa30636fb84b209210299684e1be66d9e58217;p=GitHub%2FLineageOS%2Fandroid_kernel_motorola_exynos9610.git [PATCH] md: all hot-add and hot-remove of md intent logging bitmaps Both file-bitmaps and superblock bitmaps are supported. If you add a bitmap file on the array device, you lose. This introduces a 'default_bitmap_offset' field in mddev, as the ioctl used for adding a superblock bitmap doesn't have room for giving an offset. Later, this value will be setable via sysfs. Signed-off-by: Neil Brown Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- diff --git a/drivers/md/md.c b/drivers/md/md.c index 63c566165189..ae654466dc23 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -623,6 +623,7 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) mddev->size = sb->size; mddev->events = md_event(sb); mddev->bitmap_offset = 0; + mddev->default_bitmap_offset = MD_SB_BYTES >> 9; if (sb->state & (1<recovery_cp = MaxSector; @@ -648,7 +649,7 @@ static int super_90_validate(mddev_t *mddev, mdk_rdev_t *rdev) printk(KERN_WARNING "md: bitmaps only support for raid1\n"); return -EINVAL; } - mddev->bitmap_offset = (MD_SB_BYTES >> 9); + mddev->bitmap_offset = mddev->default_bitmap_offset; } } else if (mddev->pers == NULL) { @@ -939,6 +940,9 @@ static int super_1_validate(mddev_t *mddev, mdk_rdev_t *rdev) mddev->size = le64_to_cpu(sb->size)/2; mddev->events = le64_to_cpu(sb->events); mddev->bitmap_offset = 0; + mddev->default_bitmap_offset = 0; + if (mddev->minor_version == 0) + mddev->default_bitmap_offset = -(64*1024)/512; mddev->recovery_cp = le64_to_cpu(sb->resync_offset); memcpy(mddev->uuid, sb->set_uuid, 16); @@ -2073,6 +2077,8 @@ static int get_array_info(mddev_t * mddev, void __user * arg) info.state = 0; if (mddev->in_sync) info.state = (1<bitmap && mddev->bitmap_offset) + info.state = (1<pers || mddev->bitmap_file) - return -EBUSY; + if (mddev->pers) { + if (!mddev->pers->quiesce) + return -EBUSY; + if (mddev->recovery || mddev->sync_thread) + return -EBUSY; + /* we should be able to change the bitmap.. */ + } - mddev->bitmap_file = fget(fd); - if (mddev->bitmap_file == NULL) { - printk(KERN_ERR "%s: error: failed to get bitmap file\n", - mdname(mddev)); - return -EBADF; - } + if (fd >= 0) { + if (mddev->bitmap) + return -EEXIST; /* cannot add when bitmap is present */ + mddev->bitmap_file = fget(fd); - err = deny_bitmap_write_access(mddev->bitmap_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; - } else + if (mddev->bitmap_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); + if (err) { + printk(KERN_ERR "%s: error: bitmap file is already in use\n", + mdname(mddev)); + fput(mddev->bitmap_file); + mddev->bitmap_file = NULL; + return err; + } mddev->bitmap_offset = 0; /* file overrides offset */ + } else if (mddev->bitmap == NULL) + return -ENOENT; /* cannot remove what isn't there */ + err = 0; + if (mddev->pers) { + mddev->pers->quiesce(mddev, 1); + if (fd >= 0) + err = bitmap_create(mddev); + if (fd < 0 || err) + bitmap_destroy(mddev); + mddev->pers->quiesce(mddev, 0); + } else if (fd < 0) { + if (mddev->bitmap_file) + fput(mddev->bitmap_file); + mddev->bitmap_file = NULL; + } + return err; } @@ -2528,6 +2560,11 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) { int rv = 0; int cnt = 0; + int state = 0; + + /* calculate expected state,ignoring low bits */ + if (mddev->bitmap && mddev->bitmap_offset) + state |= (1 << MD_SB_BITMAP_PRESENT); if (mddev->major_version != info->major_version || mddev->minor_version != info->minor_version || @@ -2536,12 +2573,16 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) mddev->level != info->level || /* mddev->layout != info->layout || */ !mddev->persistent != info->not_persistent|| - mddev->chunk_size != info->chunk_size ) + mddev->chunk_size != info->chunk_size || + /* ignore bottom 8 bits of state, and allow SB_BITMAP_PRESENT to change */ + ((state^info->state) & 0xfffffe00) + ) return -EINVAL; /* Check there is only one change */ if (mddev->size != info->size) cnt++; if (mddev->raid_disks != info->raid_disks) cnt++; if (mddev->layout != info->layout) cnt++; + if ((state ^ info->state) & (1< 1) return -EINVAL; @@ -2620,6 +2661,35 @@ static int update_array_info(mddev_t *mddev, mdu_array_info_t *info) } } } + if ((state ^ info->state) & (1<pers->quiesce == NULL) + return -EINVAL; + if (mddev->recovery || mddev->sync_thread) + return -EBUSY; + if (info->state & (1<bitmap) + return -EEXIST; + if (mddev->default_bitmap_offset == 0) + return -EINVAL; + mddev->bitmap_offset = mddev->default_bitmap_offset; + mddev->pers->quiesce(mddev, 1); + rv = bitmap_create(mddev); + if (rv) + bitmap_destroy(mddev); + mddev->pers->quiesce(mddev, 0); + } else { + /* remove the bitmap */ + if (!mddev->bitmap) + return -ENOENT; + if (mddev->bitmap->file) + return -EINVAL; + mddev->pers->quiesce(mddev, 1); + bitmap_destroy(mddev); + mddev->pers->quiesce(mddev, 0); + mddev->bitmap_offset = 0; + } + } md_update_sb(mddev); return rv; } diff --git a/drivers/md/raid1.c b/drivers/md/raid1.c index ace41c571aeb..ba643e4bfac9 100644 --- a/drivers/md/raid1.c +++ b/drivers/md/raid1.c @@ -1565,6 +1565,35 @@ static int raid1_reshape(mddev_t *mddev, int raid_disks) return 0; } +void raid1_quiesce(mddev_t *mddev, int state) +{ + conf_t *conf = mddev_to_conf(mddev); + + switch(state) { + case 0: + spin_lock_irq(&conf->resync_lock); + conf->barrier++; + wait_event_lock_irq(conf->wait_idle, !conf->nr_pending, + conf->resync_lock, raid1_unplug(mddev->queue)); + spin_unlock_irq(&conf->resync_lock); + break; + case 1: + spin_lock_irq(&conf->resync_lock); + conf->barrier--; + spin_unlock_irq(&conf->resync_lock); + wake_up(&conf->wait_resume); + wake_up(&conf->wait_idle); + break; + } + if (mddev->thread) { + if (mddev->bitmap) + mddev->thread->timeout = mddev->bitmap->daemon_sleep * HZ; + else + mddev->thread->timeout = MAX_SCHEDULE_TIMEOUT; + md_wakeup_thread(mddev->thread); + } +} + static mdk_personality_t raid1_personality = { @@ -1581,6 +1610,7 @@ static mdk_personality_t raid1_personality = .sync_request = sync_request, .resize = raid1_resize, .reshape = raid1_reshape, + .quiesce = raid1_quiesce, }; static int __init raid_init(void) diff --git a/include/linux/raid/md_k.h b/include/linux/raid/md_k.h index 8c14ba565a45..817062bf7352 100644 --- a/include/linux/raid/md_k.h +++ b/include/linux/raid/md_k.h @@ -278,6 +278,10 @@ struct mddev_s * start of bitmap. May be * negative, but not '0' */ + long default_bitmap_offset; /* this is the offset to use when + * hot-adding a bitmap. It should + * eventually be settable by sysfs. + */ struct list_head all_mddevs; }; @@ -314,6 +318,12 @@ struct mdk_personality_s int (*resize) (mddev_t *mddev, sector_t sectors); int (*reshape) (mddev_t *mddev, int raid_disks); int (*reconfig) (mddev_t *mddev, int layout, int chunk_size); + /* quiesce moves between quiescence states + * 0 - fully active + * 1 - no new requests allowed + * others - reserved + */ + void (*quiesce) (mddev_t *mddev, int state); };