From: Christoph Hellwig Date: Fri, 11 Aug 2023 10:08:25 +0000 (+0200) Subject: block: call into the file system for bdev_mark_dead X-Git-Tag: v6.6.17~4097^2~12 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=d8530de5a6e82be0ce17a5fdf727a394bcf6444c;p=platform%2Fkernel%2Flinux-rpi.git block: call into the file system for bdev_mark_dead Combine the newly merged bdev_mark_dead helper with the existing mark_dead holder operation so that all operations that invalidate a device that is dead or being removed now go through the holder ops. This allows file systems to explicitly shutdown either ASAP (for a surprise removal) or after writing back data (for an orderly removal), and do so not only for the main device. Signed-off-by: Christoph Hellwig Reviewed-by: Josef Bacik Message-Id: <20230811100828.1897174-15-hch@lst.de> Signed-off-by: Christian Brauner --- diff --git a/block/bdev.c b/block/bdev.c index 074a9ff..4d58008 100644 --- a/block/bdev.c +++ b/block/bdev.c @@ -968,31 +968,19 @@ EXPORT_SYMBOL(lookup_bdev); * 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. + * This calls into the file system, which then typicall syncs out all dirty data + * and writes back inodes and then invalidates any cached data in the inodes on + * the file system. In addition we also invalidate the block device mapping. */ void bdev_mark_dead(struct block_device *bdev, bool surprise) { - struct super_block *sb = get_super(bdev); - int res = 0; + mutex_lock(&bdev->bd_holder_lock); + if (bdev->bd_holder_ops && bdev->bd_holder_ops->mark_dead) + bdev->bd_holder_ops->mark_dead(bdev, surprise); + else + sync_blockdev(bdev); + mutex_unlock(&bdev->bd_holder_lock); - 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 - * under us (->put_super runs with the write lock - * hold). - */ - shrink_dcache_sb(sb); - res = invalidate_inodes(sb, true); - drop_super(sb); - } else { - if (!surprise) - sync_blockdev(bdev); - } invalidate_bdev(bdev); } #ifdef CONFIG_DASD_MODULE diff --git a/block/genhd.c b/block/genhd.c index afc2cb0..cc32a0c 100644 --- a/block/genhd.c +++ b/block/genhd.c @@ -554,7 +554,7 @@ out_exit_elevator: } EXPORT_SYMBOL(device_add_disk); -static void blk_report_disk_dead(struct gendisk *disk) +static void blk_report_disk_dead(struct gendisk *disk, bool surprise) { struct block_device *bdev; unsigned long idx; @@ -565,10 +565,7 @@ static void blk_report_disk_dead(struct gendisk *disk) continue; rcu_read_unlock(); - mutex_lock(&bdev->bd_holder_lock); - if (bdev->bd_holder_ops && bdev->bd_holder_ops->mark_dead) - bdev->bd_holder_ops->mark_dead(bdev); - mutex_unlock(&bdev->bd_holder_lock); + bdev_mark_dead(bdev, surprise); put_device(&bdev->bd_device); rcu_read_lock(); @@ -576,14 +573,7 @@ static void blk_report_disk_dead(struct gendisk *disk) rcu_read_unlock(); } -/** - * blk_mark_disk_dead - mark a disk as dead - * @disk: disk to mark as dead - * - * Mark as disk as dead (e.g. surprise removed) and don't accept any new I/O - * to this disk. - */ -void blk_mark_disk_dead(struct gendisk *disk) +static void __blk_mark_disk_dead(struct gendisk *disk) { /* * Fail any new I/O. @@ -603,8 +593,19 @@ void blk_mark_disk_dead(struct gendisk *disk) * Prevent new I/O from crossing bio_queue_enter(). */ blk_queue_start_drain(disk->queue); +} - blk_report_disk_dead(disk); +/** + * blk_mark_disk_dead - mark a disk as dead + * @disk: disk to mark as dead + * + * Mark as disk as dead (e.g. surprise removed) and don't accept any new I/O + * to this disk. + */ +void blk_mark_disk_dead(struct gendisk *disk) +{ + __blk_mark_disk_dead(disk); + blk_report_disk_dead(disk, true); } EXPORT_SYMBOL_GPL(blk_mark_disk_dead); @@ -641,17 +642,20 @@ void del_gendisk(struct gendisk *disk) disk_del_events(disk); /* - * Prevent new openers by unlinked the bdev inode, and write out - * dirty data before marking the disk dead and stopping all I/O. + * Prevent new openers by unlinked the bdev inode. */ mutex_lock(&disk->open_mutex); - xa_for_each(&disk->part_tbl, idx, part) { + xa_for_each(&disk->part_tbl, idx, part) remove_inode_hash(part->bd_inode); - bdev_mark_dead(part, false); - } mutex_unlock(&disk->open_mutex); - blk_mark_disk_dead(disk); + /* + * Tell the file system to write back all dirty data and shut down if + * it hasn't been notified earlier. + */ + if (!test_bit(GD_DEAD, &disk->state)) + blk_report_disk_dead(disk, false); + __blk_mark_disk_dead(disk); /* * Drop all partitions now that the disk is marked dead. diff --git a/fs/super.c b/fs/super.c index 9b2188e..11fa21d 100644 --- a/fs/super.c +++ b/fs/super.c @@ -1228,7 +1228,7 @@ static bool lock_active_super(struct super_block *sb) return true; } -static void fs_mark_dead(struct block_device *bdev) +static void fs_bdev_mark_dead(struct block_device *bdev, bool surprise) { struct super_block *sb = bdev->bd_holder; @@ -1238,6 +1238,10 @@ static void fs_mark_dead(struct block_device *bdev) if (!lock_active_super(sb)) return; + if (!surprise) + sync_filesystem(sb); + shrink_dcache_sb(sb); + invalidate_inodes(sb, true); if (sb->s_op->shutdown) sb->s_op->shutdown(sb); @@ -1245,7 +1249,7 @@ static void fs_mark_dead(struct block_device *bdev) } const struct blk_holder_ops fs_holder_ops = { - .mark_dead = fs_mark_dead, + .mark_dead = fs_bdev_mark_dead, }; EXPORT_SYMBOL_GPL(fs_holder_ops); diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 6721595..cdd03c6 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1461,7 +1461,7 @@ void blkdev_show(struct seq_file *seqf, off_t offset); #endif struct blk_holder_ops { - void (*mark_dead)(struct block_device *bdev); + void (*mark_dead)(struct block_device *bdev, bool surprise); }; extern const struct blk_holder_ops fs_holder_ops;