xfs: mount API patch series

This patch series adds support to xfs for the new kernel mount API
as described in the LWN article at https://lwn.net/Articles/780267/.

In the article there's a lengthy description of the reasons for
adopting the API and problems expected to be resolved by using it.

The series has been applied to the repository located at
git://git.kernel.org/pub/scm/fs/xfs/xfs-linux.git, and built, and
the xfstests suite run against it.

I didn't see any failures that look like they are related to mounting.

Changes from the initial posting of the series:
- changed .name to uppercase in fs_parameter_description to ensure
  consistent error log messages between the vfs parser and the xfs
  parameter parser.
- clearify comment above xfs_parse_param() about when possibly
  allocated mp->m_logname or mp->m_rtname are freed.
- factor out xfs_remount_rw() and xfs_remount_ro() from  xfs_remount().
- changed xfs_mount_alloc() to not set super block in xfs_mount so it
  can be re-used when switching to the mount-api.
- fixed don't check for NULL when calling kfree() in xfs_fc_free().
- refactored xfs_parseargs() in an attempt to highlight the code
  that actually changes in converting to use the new mount api.
- dropped xfs-mount-api-rename-xfs_fill_super.patch, it didn't seem
  necessary.
- move comment about remount difficulties above xfs_reconfigure()
  and increase line length to try and make the comment managable.
- add patch vfs-Create-fs_context-aware-mount_bdev-replacement.patch
  that adds the vfs_get_block_super() needed by the series.

The patch "vfs: Create fs_context-aware mount_bdev() replacement" is
currently included in linux-next so there will be conflicts if this
series is merged in the next merge window so please be aware of it.

---

David Howells (1):
      vfs: Create fs_context-aware mount_bdev() replacement

Ian Kent (14):
      xfs: mount-api - add fs parameter description
      xfs: mount-api - refactor suffix_kstrtoint()
      xfs: mount-api - refactor xfs_parseags()
      xfs: mount-api - make xfs_parse_param() take context .parse_param() args
      xfs: mount-api - move xfs_parseargs() validation to a helper
      xfs: mount-api - refactor xfs_fs_fill_super()
      xfs: mount-api - add xfs_get_tree()
      xfs: mount-api - add xfs_remount_rw() helper
      xfs: mount-api - add xfs_remount_ro() helper
      xfs: mount api - add xfs_reconfigure()
      xfs: mount-api - add xfs_fc_free()
      xfs: mount-api - dont set sb in xfs_mount_alloc()
      xfs: mount-api - switch to new mount-api
      xfs: mount-api - remove legacy mount functions


 fs/fs_context.c            |    2 
 fs/super.c                 |  111 +++++
 fs/xfs/xfs_super.c         |  949 ++++++++++++++++++++++++--------------------
 include/linux/fs_context.h |    9 
 4 files changed, 631 insertions(+), 440 deletions(-)

--
Ian