If reread partitions of disk, the paths are:
blkdev_ioctl->blkdev_reread_part->rescan_partitions->drop_partitions
->invalidate_partition->__invalidate_device
In func __invalidate_device, if disk already mounted, it will do
shrink_dcache_sb and invalidate_inodes.
This operation will effect the fs.
So add a judgement before doing rescan_partiontions to judge disk
whether mounted.
Signed-off-by: Jianpeng Ma <[email protected]>
---
block/ioctl.c | 8 ++++++++
1 file changed, 8 insertions(+)
diff --git a/block/ioctl.c b/block/ioctl.c
index a31d91d..374af7e 100644
--- a/block/ioctl.c
+++ b/block/ioctl.c
@@ -154,11 +154,19 @@ static int blkdev_reread_part(struct block_device *bdev)
{
struct gendisk *disk = bdev->bd_disk;
int res;
+ struct super_block *sb;
if (!disk_part_scan_enabled(disk) || bdev != bdev->bd_contains)
return -EINVAL;
if (!capable(CAP_SYS_ADMIN))
return -EACCES;
+
+ sb = get_super(bdev);
+ if (sb) {
+ drop_super(sb);
+ return -EBUSY;
+ }
+
if (!mutex_trylock(&bdev->bd_mutex))
return -EBUSY;
res = rescan_partitions(disk, bdev);
--
1.8.4
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