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- don't allow swapon on files on the realtime device, because the swap
   code will swap pages out to blocks on the data device, thereby
   corrupting the filesystem
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Merge tag 'xfs-4.12-fixes-5' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

Pull xfs fixes from Darrick Wong:
 "I have one more bugfix for you for 4.12-rc7 to fix a disk corruption
  problem:

   - don't allow swapon on files on the realtime device, because the
     swap code will swap pages out to blocks on the data device, thereby
     corrupting the filesystem"

* tag 'xfs-4.12-fixes-5' of git://git.kernel.org/pub/scm/fs/xfs/xfs-linux:
  xfs: don't allow bmap on rt files
This commit is contained in:
Linus Torvalds 2017-06-23 12:23:06 -07:00
commit 7b249bdc3d
1 changed files with 5 additions and 2 deletions
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7
fs/xfs/xfs_aops.c
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@ -1316,9 +1316,12 @@ xfs_vm_bmap(
* The swap code (ab-)uses ->bmap to get a block mapping and then * The swap code (ab-)uses ->bmap to get a block mapping and then
* bypasseѕ the file system for actual I/O. We really can't allow * bypasseѕ the file system for actual I/O. We really can't allow
* that on reflinks inodes, so we have to skip out here. And yes, * that on reflinks inodes, so we have to skip out here. And yes,
* 0 is the magic code for a bmap error.. * 0 is the magic code for a bmap error.
*
* Since we don't pass back blockdev info, we can't return bmap
* information for rt files either.
*/ */
if (xfs_is_reflink_inode(ip)) if (xfs_is_reflink_inode(ip) || XFS_IS_REALTIME_INODE(ip))
return 0; return 0;
filemap_write_and_wait(mapping); filemap_write_and_wait(mapping);