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 <hch@xxxxxx>
---
block/bdev.c | 30 +++++++++-------------------
block/genhd.c | 44 +++++++++++++++++++++++-------------------
fs/super.c | 8 ++++++--
include/linux/blkdev.h | 2 +-
4 files changed, 40 insertions(+), 44 deletions(-)
diff --git a/block/bdev.c b/block/bdev.c
index b9ca947bd5e405..658d5dd62cac0a 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
diff --git a/block/genhd.c b/block/genhd.c
index afc2cb09eb94b9..cc32a0c704eb84 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -554,7 +554,7 @@ int __must_check device_add_disk(struct device *parent, struct gendisk *disk,
}
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 bbce0fdebf7e52..94d41040584f7b 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 6721595b9f9741..cdd03c612d3957 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;
--
2.39.2
