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On some older kernels, i.e. 2.6.18, zvol_ioctl_by_inode() may get passed a NULL file pointer if the user tries to mount a zvol without a filesystem on it. This change adds checks to prevent a null pointer dereference. Closes #73. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Native ZFS for Linux! ZFS is an advanced file system and volume manager which was originally developed for Solaris. It has been successfully ported to FreeBSD and now there is a functional Linux ZFS kernel port too. The port currently includes a fully functional and stable SPA, DMU, and ZVOL with a ZFS Posix Layer (ZPL) on the way!
$ ./configure
$ make pkg
Full documentation for building, configuring, and using ZFS can be found at: http://zfsonlinux.org
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