On Wed, Apr 20, 2011 at 01:15:22AM +0000, Rick Macklem wrote: > Author: rmacklem > Date: Wed Apr 20 01:15:22 2011 > New Revision: 220877 > URL: http://svn.freebsd.org/changeset/base/220877 > > Log: > Modify the offset + size checks for read and write in the > experimental NFS client to take care of overflows for the calls > above the buffer cache layer in a manner similar to r220876. > Thanks go to dillon at apollo.backplane.com for providing the > snippet of code that does this. [...] > + tmp_off = uio->uio_offset + uio->uio_resid; > + mtx_lock(&nmp->nm_mtx); > + if (tmp_off > nmp->nm_maxfilesize || tmp_off < uio->uio_offset) { > + mtx_unlock(&nmp->nm_mtx); > return (EFBIG); > + } > + mtx_unlock(&nmp->nm_mtx);
I don't think you need the lock to protect nm_maxfilesize. Can it change from under us? My guess is that it is set on mount time and is not modified afterwards. -- Pawel Jakub Dawidek http://www.wheelsystems.com FreeBSD committer http://www.FreeBSD.org Am I Evil? Yes, I Am! http://yomoli.com
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