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authorDavid Chinner <dgc@sgi.com>2007-07-19 17:39:55 +1000
committerTim Shimmin <tes@chook.melbourne.sgi.com>2007-07-19 19:50:50 +1000
commit5417169026c3df151adf5a65eb061278b0a72e69 (patch)
treee4872a4243e12fe931ff6ac789df181b579b884c /net/packet
parent589f1e81bde732dd0b1bc5d01b6bddd4bcb4527b (diff)
downloadlinux-5417169026c3df151adf5a65eb061278b0a72e69.tar.bz2
[FS] Implement block_page_mkwrite.
Many filesystems need a ->page-mkwrite callout to correctly set up pages that have been written to by mmap. This is especially important when mmap is writing into holes as it allows filesystems to correctly account for and allocate space before the mmap write is allowed to proceed. Protection against truncate races is provided by locking the page and checking to see whether the page mapping is correct and whether it is beyond EOF so we don't end up allowing allocations beyond the current EOF or changing EOF as a result of a mmap write. SGI-PV: 940392 SGI-Modid: 2.6.x-xfs-melb:linux:29146a Signed-off-by: David Chinner <dgc@sgi.com> Signed-off-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Tim Shimmin <tes@sgi.com>
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