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authorJan Kara <jack@suse.cz>2017-02-08 14:30:53 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-02-08 15:41:43 -0800
commit0911d0041c22922228ca52a977d7b0b0159fee4b (patch)
treeecd0e2bd3ec2f1e934409a43dd3b0798860c7d8b /net/sched
parented5bd7dc88edf4a4a9c67130742b1b59aa017a5f (diff)
mm: avoid returning VM_FAULT_RETRY from ->page_mkwrite handlers
Some ->page_mkwrite handlers may return VM_FAULT_RETRY as its return code (GFS2 or Lustre can definitely do this). However VM_FAULT_RETRY from ->page_mkwrite is completely unhandled by the mm code and results in locking and writeably mapping the page which definitely is not what the caller wanted. Fix Lustre and block_page_mkwrite_ret() used by other filesystems (notably GFS2) to return VM_FAULT_NOPAGE instead which results in bailing out from the fault code, the CPU then retries the access, and we fault again effectively doing what the handler wanted. Link: http://lkml.kernel.org/r/20170203150729.15863-1-jack@suse.cz Signed-off-by: Jan Kara <jack@suse.cz> Reported-by: Al Viro <viro@ZenIV.linux.org.uk> Reviewed-by: Jinshan Xiong <jinshan.xiong@intel.com> Cc: Matthew Wilcox <willy@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'net/sched')
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