From: Christoph Hellwig Date: Fri, 11 Aug 2023 10:08:24 +0000 (+0200) Subject: block: consolidate __invalidate_device and fsync_bdev X-Git-Tag: v6.6.17~4097^2~13 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=560e20e4bf6484a0c12f9f3c7a1aa55056948e1e;p=platform%2Fkernel%2Flinux-rpi.git block: consolidate __invalidate_device and fsync_bdev We currently have two interfaces that take a block_devices and the find a mounted file systems to flush or invaldidate data on it. Both are a bit problematic because they only work for the "main" block devices that is used as s_dev for the super_block, and because they don't call into the file system at all. Merge the two into a new bdev_mark_dead helper that does both the syncing and invalidation and which is properly documented. This is in preparation of merging the functionality into the ->mark_dead holder operation so that it will work on additional block devices used by a file systems and give us a single entry point for invalidation of dead devices or media. Note that a single standalone fsync_bdev call for an obscure ioctl remains for now, but that one will also be deal with in a bit. Signed-off-by: Christoph Hellwig Reviewed-by: Josef Bacik Message-Id: <20230811100828.1897174-14-hch@lst.de> Signed-off-by: Christian Brauner --- diff --git a/block/bdev.c b/block/bdev.c index 979e28a..074a9ff 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -221,7 +221,6 @@ int fsync_bdev(struct block_device *bdev) } return sync_blockdev(bdev); } -EXPORT_SYMBOL(fsync_bdev); /** * freeze_bdev - lock a filesystem and force it into a consistent state @@ -960,12 +959,27 @@ out_path_put: } EXPORT_SYMBOL(lookup_bdev); -int __invalidate_device(struct block_device *bdev, bool kill_dirty) +/** + * bdev_mark_dead - mark a block device as dead + * @bdev: block device to operate on + * @surprise: indicate a surprise removal + * + * Tell the file system that this devices or media is dead. If @surprise is set + * to %true the device or media is already gone, if not we are preparing for an + * orderly removal. + * + * This syncs out all dirty data and writes back inodes and then invalidates any + * cached data in the inodes on the file system, the inodes themselves and the + * block device mapping. + */ +void bdev_mark_dead(struct block_device *bdev, bool surprise) { struct super_block *sb = get_super(bdev); int res = 0; if (sb) { + if (!surprise) + sync_filesystem(sb); /* * no need to lock the super, get_super holds the * read mutex so the filesystem cannot go away @@ -973,13 +987,22 @@ int __invalidate_device(struct block_device *bdev, bool kill_dirty) * hold). */ shrink_dcache_sb(sb); - res = invalidate_inodes(sb, kill_dirty); + res = invalidate_inodes(sb, true); drop_super(sb); + } else { + if (!surprise) + sync_blockdev(bdev); } invalidate_bdev(bdev); - return res; } -EXPORT_SYMBOL(__invalidate_device); +#ifdef CONFIG_DASD_MODULE +/* + * Drivers should not use this directly, but the DASD driver has historically + * had a shutdown to offline mode that doesn't actually remove the gendisk + * that otherwise looks a lot like a safe device removal. + */ +EXPORT_SYMBOL_GPL(bdev_mark_dead); +#endif void sync_bdevs(bool wait) { diff --git a/block/disk-events.c b/block/disk-events.c index 6b858d3..422db82 100644 --- a/block/disk-events.c +++ b/block/disk-events.c @@ -281,7 +281,7 @@ bool disk_check_media_change(struct gendisk *disk) if (!(events & DISK_EVENT_MEDIA_CHANGE)) return false; - __invalidate_device(disk->part0, true); + bdev_mark_dead(disk->part0, true); set_bit(GD_NEED_PART_SCAN, &disk->state); return true; } @@ -300,7 +300,7 @@ void disk_force_media_change(struct gendisk *disk) { disk_event_uevent(disk, DISK_EVENT_MEDIA_CHANGE); inc_diskseq(disk); - __invalidate_device(disk->part0, true); + bdev_mark_dead(disk->part0, true); set_bit(GD_NEED_PART_SCAN, &disk->state); } EXPORT_SYMBOL_GPL(disk_force_media_change); diff --git a/block/genhd.c b/block/genhd.c index 3d287b3..afc2cb0 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -647,8 +647,7 @@ void del_gendisk(struct gendisk *disk) mutex_lock(&disk->open_mutex); xa_for_each(&disk->part_tbl, idx, part) { remove_inode_hash(part->bd_inode); - fsync_bdev(part); - __invalidate_device(part, true); + bdev_mark_dead(part, false); } mutex_unlock(&disk->open_mutex); diff --git a/block/partitions/core.c b/block/partitions/core.c index 13a7341..e137a87 100644 --- a/block/partitions/core.c +++ b/block/partitions/core.c @@ -281,10 +281,7 @@ static void delete_partition(struct block_device *part) * looked up any more even when openers still hold references. */ remove_inode_hash(part->bd_inode); - - fsync_bdev(part); - __invalidate_device(part, true); - + bdev_mark_dead(part, false); drop_partition(part); } diff --git a/drivers/s390/block/dasd.c b/drivers/s390/block/dasd.c index 675b38a..1f642be 100644 --- a/drivers/s390/block/dasd.c +++ b/drivers/s390/block/dasd.c @@ -3626,10 +3626,8 @@ int dasd_generic_set_offline(struct ccw_device *cdev) * so sync bdev first and then wait for our queues to become * empty */ - if (device->block) { - fsync_bdev(device->block->bdev); - __invalidate_device(device->block->bdev, true); - } + if (device->block) + bdev_mark_dead(device->block->bdev, false); dasd_schedule_device_bh(device); rc = wait_event_interruptible(shutdown_waitq, _wait_for_empty_queues(device)); diff --git a/fs/super.c b/fs/super.c index f72a111..9b2188e 100644 --- a/fs/super.c +++ b/fs/super.c @@ -1359,7 +1359,7 @@ int get_tree_bdev(struct fs_context *fc, /* * We drop s_umount here because we need to open the bdev and * bdev->open_mutex ranks above s_umount (blkdev_put() -> - * __invalidate_device()). It is safe because we have active sb + * bdev_mark_dead()). It is safe because we have active sb * reference and SB_BORN is not set yet. */ up_write(&s->s_umount); @@ -1411,7 +1411,7 @@ struct dentry *mount_bdev(struct file_system_type *fs_type, /* * We drop s_umount here because we need to open the bdev and * bdev->open_mutex ranks above s_umount (blkdev_put() -> - * __invalidate_device()). It is safe because we have active sb + * bdev_mark_dead()). It is safe because we have active sb * reference and SB_BORN is not set yet. */ up_write(&s->s_umount); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index c8eab6e..6721595 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -751,6 +751,7 @@ static inline int bdev_read_only(struct block_device *bdev) bool set_capacity_and_notify(struct gendisk *disk, sector_t size); void disk_force_media_change(struct gendisk *disk); +void bdev_mark_dead(struct block_device *bdev, bool surprise); void add_disk_randomness(struct gendisk *disk) __latent_entropy; void rand_initialize_disk(struct gendisk *disk); @@ -809,7 +810,6 @@ int __register_blkdev(unsigned int major, const char *name, void unregister_blkdev(unsigned int major, const char *name); bool disk_check_media_change(struct gendisk *disk); -int __invalidate_device(struct block_device *bdev, bool kill_dirty); void set_capacity(struct gendisk *disk, sector_t size); #ifdef CONFIG_BLOCK_HOLDER_DEPRECATED