XFS Status Updates
XFS status update for January 2009
January has been an extremely busy month on the userspace front. Many smaller and medium updates went into xfsprogs, xfstests and to a lesser extent xfsdump. xfsprogs and xfsdump are ramping up for getting a 3.0.0 release out in early February which will include the first major re-sync with the kernel code in libxfs, a cleanup of the exported library interfaces and the move of two tools (xfs_fsr and xfs_estimate) from the xfsdump package to xfsprogs. After this the xfsprogs package will contain all tools that use internal libxfs interfaces which fortunately equates to those needed for normal administration. The xfsdump package now only contains the xfsdump/xfsrestore tools needed for backing up and restoring XFS filesystems. In addition it grew a fix to support dump/restore on systems with a 64k page size. A large number of acl/attr package patches was posted to the list, but pending a possible split of these packages from the XFS project these weren't processed yet.
On the kernel side the big excitement in January was an in-memory corruption introduced in the btree refactoring which hit people running 32bit platforms without support for large block devices. This issue was fixed and pushed to the 2.6.29 development tree after a long collaborative debugging effort at linux.conf.au. Besides that about a dozen minor fixes were pushed to 2.6.29 and the first batch of misc patches for the 2.6.30 release cycle was sent out.
At the end of December the SGI group in Melbourne which the previous XFS maintainer and some other developers worked for has been closed down and they will be missed greatly. As a result maintainership has been passed on in a way that has been slightly controversial in the community, and the first patchset of work in progress in Melbourne have been posted to the list to be picked up by others.
The xfs.org wiki has gotten a little facelift on it's front page making it a lot easier to read.
XFS status update for December 2008
On Christmas Eve the 2.6.28 mainline kernel was release, with only minor XFS bug fixes over 2.6.27.
On the development side December has been busy but unspectacular month. All lot of misc fixes and improvements have been sent out, tested and committed especially on the user land side.
XFS status update for November 2008
The mainline kernel is now at 2.6.28-rc6 and includes a small number of XFS fixes. There have been no updates to the XFS development tree during November. Without new regressions that large number of changes that missed 2.6.28 has thus stabilized to be ready for 2.6.29. In the meantime kernel-side development has been slow, with the only major patch set being a wide number of fixes to the compatibility for 32 bit ioctls on a 64 bit kernel.
In the meantime there has been a large number of commits to the user space tree, which mostly consist of smaller fixes. xfsprogs is getting close to have the 3.0.0 release which will be the first full resync with the kernel sources since the year 2005.
XFS status update for October 2008
Linux 2.6.27 released with all the bits covered in last month's report. It did however miss two important fixes for regressions that a few people hit. 188.8.131.52 or later are recommended for use with XFS.
In the meantime the generic btree implementation, the sync reorganization and after a lot of merge pain the XFS and VFS inode unification hit the development tree during the time allocated for the merge window. No XFS updates other than the two regression fixes also in 184.108.40.206 have made it into mainline as of 2.6.28-rc3.
The only new feature on the list in October is support for the fiemap interface that has been added to the VFS during the 2.6.28 merge window. However there was lot of patch traffic consisting of fixes and respun versions of previously known patches. There still is a large backlog of patches on the list that is not applied to the development tree yet.
XFS status update for September 2008
With Linux 2.6.27 still not released but only making slow progress from 2.6.27-rc5 to 2.6.27-rc8 XFS changes in mainline have been minimal in September with only about half a dozen bug fixes patches.
In the meantime the generic btree patch set has been committed to the development tree, but not many other updates yet. On the user space side xfsprogs 2.10.1 has been released on September 5th with a number of important bug fixes. Following the release of xfsprogs 2.10.1 open season for development of the user space code has started. The first full update of the shared kernel / user space code in libxfs since 2005 has been committed. In addition to that the number of headers installed for the regular devel package has been reduced to the required minimum and support for checking the source code for endianess errors using sparse has been added.
The patch sets to unify the XFS and Linux inode structures, and rewrite various bits of the sync code have seen various iterations on the XFS list, but haven't been committed yet. A first set of patches implementing CRCs for various metadata structures has been posted to the list.
XFS status update for August 2008
With the 2.6.27-rc5 release the 2.6.27 cycle is nearing it's end. The major XFS feature in 2.6.27-rc5 is support for case-insensitive file names. At this point it is still limited to 7bit ASCII file names, with updates for utf8 file names expected to follow later. In addition to that 2.6.27-rc5 fixes a long-standing problem with non-EABI arm compiler which pack some XFS data structures wrongly. Besides this 2.6.27-rc5 also contains various cleanups, most notably the removal of the last bhv_vnode_t instances, and most uses of semaphores. As usual the diffstat for XFS from 2.6.26 to 2.6.26-rc5 is negative:
100 files changed, 3819 insertions(+), 4409 deletions(-)
On the user space front a new minor xfsprogs version is about to be released containing various fixes including the user space part of arm packing fix.
Work in progress on the XFS mailing list are a large patch set to unify the alloc, inobt and bmap btree implementation into a single that supports arbitrarily pluggable key and record formats. These btree changes are the first major preparation for adding CRC checks to all metadata structures in XFS, and an even larger patch set to unify the XFS and Linux inode structures, and perform all inode write back from the btree uses instead of an inode cache in XFS.