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deny partial write for loop dev fd

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Partial write can be easily supported by LO_CRYPT_NONE mode, but it is not
easy in LO_CRYPT_CRYPTOAPI case, because of its block nature.  I don't know
who still used cryptoapi, but theoretically it is possible.  So let's leave
things as they are.  Loop device doesn't support partial write before
Nick's "write_begin/write_end" patch set, and let's it behave the same way
after.

Signed-off-by: Dmitriy Monakhov <dmonakhov@openvz.org>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Dmitry Monakhov 2007-10-16 01:25:02 -07:00 committed by Linus Torvalds
parent afddba49d1
commit 8268f5a741
1 changed files with 1 additions and 3 deletions
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4
drivers/block/loop.c
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@ -245,10 +245,8 @@ static int do_lo_send_aops(struct loop_device *lo, struct bio_vec *bvec,
ret = pagecache_write_end(file, mapping, pos, size, copied,
page, fsdata);
if (ret < 0)
if (ret < 0 || ret != copied)
goto fail;
if (ret < copied)
copied = ret;
if (unlikely(transfer_result))
goto fail;