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authorJ. Bruce Fields <bfields@redhat.com>2011-09-21 10:58:13 -0400
committerroot <root@serles.lst.de>2011-10-28 14:59:00 +0200
commitf3c7691e8d30d88899b514675c7c86d19057b5fd (patch)
tree0065bcc05b19a99d8785ce523f992a48fe573e79 /fs/compat.c
parent79835a710d6ff811659c8de46f89c7577c3b8cc6 (diff)
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leases: fix write-open/read-lease race
In setlease, we use i_writecount to decide whether we can give out a read lease. In open, we break leases before incrementing i_writecount. There is therefore a window between the break lease and the i_writecount increment when setlease could add a new read lease. This would leave us with a simultaneous write open and read lease, which shouldn't happen. Signed-off-by: J. Bruce Fields <bfields@redhat.com> Signed-off-by: Christoph Hellwig <hch@lst.de>
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