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authorXin Zhong <xin.zhong@intel.com>2010-12-09 09:30:14 +0000
committerChris Mason <chris.mason@oracle.com>2010-12-10 16:29:10 -0500
commit914ee295af418e936ec20a08c1663eaabe4cd07a (patch)
tree2e880ea913b8cbadf22b2288b5c278c2e5eadb60 /fs/logfs
parentf106e82caaa0d943e47cacc184f5b40d538e0044 (diff)
Btrfs: pwrite blocked when writing from the mmaped buffer of the same page
This problem is found in meego testing: http://bugs.meego.com/show_bug.cgi?id=6672 A file in btrfs is mmaped and the mmaped buffer is passed to pwrite to write to the same page of the same file. In btrfs_file_aio_write(), the pages is locked by prepare_pages(). So when btrfs_copy_from_user() is called, page fault happens and the same page needs to be locked again in filemap_fault(). The fix is to move iov_iter_fault_in_readable() before prepage_pages() to make page fault happen before pages are locked. And also disable page fault in critical region in btrfs_copy_from_user(). Reviewed-by: Yan, Zheng<zheng.z.yan@intel.com> Signed-off-by: Zhong, Xin <xin.zhong@intel.com> Signed-off-by: Chris Mason <chris.mason@oracle.com>
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