tree 9069de0b572857072bc99334b8d5e1bce14ef13f
parent 848ce8f731aed0a2d4ab5884a4f6664af73d2dd0
author Christoph Hellwig <hch@infradead.org> 1255925026 +0000
committer Alex Elder <aelder@sgi.com> 1260565879 -0600

xfs: fix mmap_sem/iolock inversion in xfs_free_eofblocks

When xfs_free_eofblocks is called from ->release the VM might already
hold the mmap_sem, but in the write path we take the iolock before
taking the mmap_sem in the generic write code.

Switch xfs_free_eofblocks to only trylock the iolock if called from
->release and skip trimming the prellocated blocks in that case.
We'll still free them later on the final iput.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Alex Elder <aelder@sgi.com>
Signed-off-by: Alex Elder <aelder@sgi.com>