xfs: xfs_spaceman utility rework

The original kernel patch that Dave wrote for xfs_spaceman implemented FS_IOC_FIEMAPFS ioctl, here is the original fiemap extension patch:

http://oss.sgi.com/archives/xfs/2012-10/msg00363.html

These patches were not posted and were just forward ported to a current 3.18-rc7+ for-next XFS tree and were pushed to the fiemapfs branch in Dave's kernel tree at:

git://git.kernel.org/pub/scm/linux/kernel/git/dgc/linux-xfs.git

The original xfs_spaceman tool that Dave wrote to call the fiemap interface and make use of it is here:

http://oss.sgi.com/archives/xfs/2012-10/msg00366.html

Dave just updated it to the 3.2.2 code base and pushed it to the spaceman branch in this tree:

git://git.kernel.org/pub/scm/fs/xfs/xfsprogs-dev.git

The description of patches in this series are as follows:

1) [PATCH 1/4] xfs: Accounting for AGFL blocks in xfs_spaceman This patch adds functionality in xfs_spaceman allowing it to account for AG Free List blocks. The previous version of xfs_spaceman failed to account for AGFL blocks as they aren't found by walking the free space btrees, so we have to walk each AGFL to find them. A new function xfs_alloc_agfl_freespace_map() is added which will walk the free extents in AGFL and account for these AGFL blocks by using agf_flfirst, agf_fllast and agf_flcount fields.

2) [PATCH 2/4] xfsprogs: Addition in debug option -d of xfs_spaceman This patch allows adding a title for the contents which are printed when xfs_spaceman is run with -d debug option from command line. The titles added are agno, agbno and len.

3) [PATCH 3/4] xfs: Adding XFS_IOC_FIEMAPFS ioctl for use in xfs_spaceman This patch is concerned with the changes made in kernel space code for adding a new XFS specific ioctl XFS_IOC_FIEMAPFS in xfs_spaceman. This ioctl will replace a file based ioctl FS_IOC_FIEMAPFS, and allow us to modify the ioctl as per requirement in the future.

4) [PATCH 4/4] xfprogs: Adding XFS_IOC_FIEMAPFS ioctl for use inxfs_spaceman This patch is concerened with the changes made in user space code for using XFS_IOC_FIEMAPFS ioctl in xfs_spaceman, which will replace FS_IOC_FIEMAPFS and make use of fiemap plumbing.

Comments, thoughts etc are welcome.

Regards,
A-DRS.

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