mirror of https://github.com/openzfs/zfs.git
34ae0ae174
If no spl_hostid was set, and no /etc/hostid file existed, the user and kernel would have different values for the hostid. The kernel's would be 0. User space's would depend on the libc implementation. On systems with glibc, it would be a generated value, probably the first 4 bytes of an IP address (see man 3 gethostid and comments above hostid_read in SPL for details). This then causes the hostid stored in the labels and in the pool config not to match the hostid userspace obtains from get_system_hostid(). Since the kernel has no way to know the libc's generated hostid value, it serves no purpose for ZFS to use the value. This patch changes user space's get_system_hostid() to conform to the kernel's method, first checking for the spl_hostid via sysfs, and then reading from /etc/hostid directly. It does not look up spl_hostid_path, because if that is set and the file it pointed to exists, spl_hostid will reflect its contents. It eliminates the call to libc's gethostid(). Reviewed by: Matthew Ahrens <mahrens@delphix.com> Reviewed-by: Giuseppe Di Natale <dinatale2@llnl.gov> Reviewed-by: Ned Bass <bass6@llnl.gov> Reviewed-by: Andreas Dilger <andreas.dilger@intel.com> Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Olaf Faaland <faaland1@llnl.gov> Closes #745 Closes #6279 |
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README.markdown
ZFS on Linux, which is also known as ZoL, is currently feature complete. It includes fully functional and stable SPA, DMU, ZVOL, and ZPL layers. And it's native!
Official Resources
Installation
Full documentation for installing ZoL on your favorite Linux distribution can be found at our site.
Contribute & Develop
We have a separate document with contribution guidelines.