src/configure, branch zfs-0.6.0-rc6

Convert 'if' statements to AS_IF in kernel.m4

2011-09-06T20:20:48Z

The 'if' statements found in kernel.m4 were converted to use the portable alternative provided by autoconf, the AS_IF macro. Signed-off-by: Prakash Surya Signed-off-by: Brian Behlendorf

Fix minor autoconf error message inconsistencies

2011-09-06T20:20:04Z

A few of the autoconf error messages were inconsistent with the rest of the build system. To be specific, the inconsistencies addressed by this commit are the following: * The second line of the error message for the CONFIG_PREEMPT check was missing it's third asterisk. * A few of the error messages were prefixed by two tabs, whereas the majority of error messages are only prefixed by a single tab. Signed-off-by: Prakash Surya Signed-off-by: Brian Behlendorf

Fix autoconf variable substitution in init scripts.

2011-08-19T23:26:14Z

Change the variable substitution in the init script templates according to the method described in the Autoconf manual; Chapter 4.7.2: Installation Directory Variables. Signed-off-by: Brian Behlendorf

Improve HAVE_EVICT_INODE check

2011-08-08T23:42:09Z

The hardened gentoo kernel defines all of the super block operation callbacks as const. This prevents the autoconf test from assigning the callback and results in a false negative. By moving the assignment in to the declaration we can avoid this issue and get a correct result for this patched kernel. Signed-off-by: Brian Behlendorf Closes #296

Autogen refresh for udev changes

2011-08-08T23:30:27Z

Run autogen.sh using the same autotools versions as upstream: * autoconf-2.63 * automake-1.11.1 * libtool-2.2.6b

Add backing_device_info per-filesystem

2011-08-04T20:37:38Z

For a long time now the kernel has been moving away from using the pdflush daemon to write 'old' dirty pages to disk. The primary reason for this is because the pdflush daemon is single threaded and can be a limiting factor for performance. Since pdflush sequentially walks the dirty inode list for each super block any delay in processing can slow down dirty page writeback for all filesystems. The replacement for pdflush is called bdi (backing device info). The bdi system involves creating a per-filesystem control structure each with its own private sets of queues to manage writeback. The advantage is greater parallelism which improves performance and prevents a single filesystem from slowing writeback to the others. For a long time both systems co-existed in the kernel so it wasn't strictly required to implement the bdi scheme. However, as of Linux 2.6.36 kernels the pdflush functionality has been retired. Since ZFS already bypasses the page cache for most I/O this is only an issue for mmap(2) writes which must go through the page cache. Even then adding this missing support for newer kernels was overlooked because there are other mechanisms which can trigger writeback. However, there is one critical case where not implementing the bdi functionality can cause problems. If an application handles a page fault it can enter the balance_dirty_pages() callpath. This will result in the application hanging until the number of dirty pages in the system drops below the dirty ratio. Without a registered backing_device_info for the filesystem the dirty pages will not get written out. Thus the application will hang. As mentioned above this was less of an issue with older kernels because pdflush would eventually write out the dirty pages. This change adds a backing_device_info structure to the zfs_sb_t which is already allocated per-super block. It is then registered when the filesystem mounted and unregistered on unmount. It will not be registered for mounted snapshots which are read-only. This change will result in flush- thread being dynamically created and destroyed per-mounted filesystem for writeback. Signed-off-by: Brian Behlendorf Closes #174

Turn the init.d scripts into autoconf config files

2011-08-01T16:54:44Z

This change ensures the paths used by the provided init scripts always reference the prefixes provided at configure time. The @sbindir@ and @sysconfdir@ prefixes will be correctly replaced at build time. Signed-off-by: Brian Behlendorf Closes #336

Fix the configure CONFIG_* option detection

2011-07-22T22:07:16Z

The latest kernels no longer define AUTOCONF_INCLUDED which was being used to detect the new style autoconf.h kernel configure options. This results in the CONFIG_* checks always failing incorrectly for newer kernels. The fix for this is a simplification of the testing method. Rather than attempting to explicitly include to renamed config header. It is simpler to unconditionally include which must pick up the correctly named header. Signed-off-by: Brian Behlendorf Closes #320

Provide a rc.d script for archlinux

2011-07-11T21:12:23Z

Unlike most other Linux distributions archlinux installs its init scripts in /etc/rc.d insead of /etc/init.d. This commit provides an archlinux rc.d script for zfs and extends the build infrastructure to ensure it get's installed in the correct place. Signed-off-by: Brian Behlendorf Closes #322

Implemented sharing datasets via NFS using libshare.

2011-07-06T16:20:28Z

The sharenfs and sharesmb properties depend on the libshare library to export datasets via NFS and SMB. This commit implements the base libshare functionality as well as support for managing NFS shares. Signed-off-by: Brian Behlendorf