8b4f9a2d55
This patch addresses three issues related to symlinks. 1) Revert the zfs_follow_link() function to a modified version of the original zfs_readlink(). The only changes from the original OpenSolaris version relate to using Linux types. For the moment this means no vnode's and no zfsvfs_t. The caller zpl_follow_link() was also updated accordingly. This change was reverted because it was slightly gratuitious. 2) Update zpl_follow_link() to use local variables for the link buffer. I'd forgotten that iov.iov_base is updated by uiomove() so after the call to zfs_readlink() it can not longer be used. We need our own private copy of the link pointer. 3) Allocate MAXPATHLEN instead of MAXPATHLEN+1. By default MAXPATHLEN is 4096 bytes which is a full page, adding one to it pushes it slightly over a page. That means you'll likely end up allocating 2 pages which is wasteful of memory and possibly slightly slower.
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