Commit d18a8679 authored by Al Viro's avatar Al Viro
Browse files

make set_blocksize() fail unless block device is opened exclusive 



Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent ead083ae

Documentation/filesystems/porting.rst

+7 −0
Original line number Diff line number Diff line
@@ -1134,3 +1134,10 @@ superblock of the main block device, i.e., the one stored in sb->s_bdev. Block 
device freezing now works for any block device owned by a given superblock, not

just the main block device. The get_active_super() helper and bd_fsfreeze_sb

pointer are gone.



---



**mandatory**



set_blocksize() takes opened struct file instead of struct block_device now

and it *must* be opened exclusive.

block/bdev.c

+3 −0
Original line number Diff line number Diff line
@@ -157,6 +157,9 @@ int set_blocksize(struct file *file, int size) 
	if (size < bdev_logical_block_size(bdev))

		return -EINVAL;



	if (!file->private_data)

		return -EINVAL;



	/* Don't change the size if it is same as current */

	if (inode->i_blkbits != blksize_bits(size)) {

		sync_blockdev(bdev);