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dax: fix vma_is_fsdax() helper 

Gerd reports that ->i_mode may contain other bits besides S_IFCHR. Use
S_ISCHR() instead. Otherwise, get_user_pages_longterm() may fail on
device-dax instances when those are meant to be explicitly allowed.

Fixes: 2bb6d28370 ("mm: introduce get_user_pages_longterm")
Cc: <stable@vger.kernel.org>
Reported-by: Gerd Rausch <gerd.rausch@oracle.com>
Acked-by: Jane Chu <jane.chu@oracle.com>
Reported-by: Haozhong Zhang <haozhong.zhang@intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Dan Williams 2018-02-21 17:08:01 -08:00
parent 9d4949b493
commit 230f5a8969
1 changed files with 1 additions and 1 deletions
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2
include/linux/fs.h
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@ -3198,7 +3198,7 @@ static inline bool vma_is_fsdax(struct vm_area_struct *vma)
if (!vma_is_dax(vma))
return false;
inode = file_inode(vma->vm_file);
if (inode->i_mode == S_IFCHR)
if (S_ISCHR(inode->i_mode))
return false; /* device-dax */
return true;
}