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Btrfs: fix btrfs page_mkwrite to return locked page

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This closes a whole where the page may be written before
the page_mkwrite caller has a chance to dirty it

(thanks to Nick Piggin)

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2009-09-11 12:33:12 -04:00
parent a1ed835e1a
commit 50a9b214bc
1 changed files with 3 additions and 0 deletions
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3
fs/btrfs/inode.c
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@ -4552,11 +4552,14 @@ int btrfs_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
}
ClearPageChecked(page);
set_page_dirty(page);
SetPageUptodate(page);
BTRFS_I(inode)->last_trans = root->fs_info->generation + 1;
unlock_extent(io_tree, page_start, page_end, GFP_NOFS);
out_unlock:
if (!ret)
return VM_FAULT_LOCKED;
unlock_page(page);
out:
return ret;