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Etienne Dechamps
a9f2397ee9
Currently, the SPL tries to determine the hostid at module load. The hostid is usually determined by running the userland program "hostid" during module initialization. Unfortunately, when the module initializes, it may be way too soon to be able to run any userland programs. This is especially true when the module is compiled directly inside the kernel (built-in); in that case, the SPL would try to run hostid when the kernel is still initializing, which of course is doomed to fail. This patch fixes the issue by deferring hostid generation until something actually needs the hostid (that is, when zone_get_hostid() is called), thus switching to a "on-initialization" model to a "on-demand" (lazy loading) model. ZFS only needs the hostid when some pool operations are requested, and this always happens way after the kernel has finished initialization, thus solving the problem. Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Issue zfsonlinux/zfs#851
The Solaris Porting Layer (SPL) is a Linux kernel module which provides many of the Solaris kernel APIs. This shim layer makes it possible to run Solaris kernel code in the Linux kernel with relatively minimal modification. This can be particularly useful when you want to track upstream Solaris development closely and don’t want the overhead of maintaining a large patch which converts Solaris primitives to Linux primitives.
To build packages for your distribution:
$ ./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 the SPL can be found at: http://zfsonlinux.org