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Etienne Dechamps
089fa91bc5
Currently, when processing DISCARD requests, zvol_discard() calls dmu_free_long_range() with the precise offset and size of the request. Unfortunately, this is not optimal for requests that are not aligned to the zvol block boundaries. Indeed, in the case of an unaligned range, dnode_free_range() will zero out the unaligned parts. Not only is this useless since we are not freeing any space by doing so, it is also slow because it translates to a read-modify-write operation. This patch fixes the issue by rounding up the discard start offset to the next volume block boundary, and rounding down the discard end offset to the previous volume block boundary. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Closes #1010
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
To copy the kernel code inside your kernel source tree for builtin compilation:
$ ./configure --enable-linux-builtin --with-linux=/usr/src/linux-...
$ ./copy-builtin /usr/src/linux-...
Full documentation for building, configuring, and using ZFS can be found at: http://zfsonlinux.org