[PATCH v7 0/3] XFS realtime device tweaks

[Richard Wareing <rwareing@fb.com>]

This is an nearly identical patch set to the v6 patch set.  The only change is
a small tweak for the first patch in the series (see patch change log), and a
suitable update to the commit description/title for this patch.

Patch 1 in this series is independent and can be merged before the others.

There is some feedback requested for patch 2 in this series, re-posting from
v5/v6 cover letters to save some digging in your mailbox.

====

(from v5/v6 cover letter)

1. Inode flag now correctly set when locks are held via XFS_BMAPI_RTDATA
   flag.
2. Realtime flag is honored when set by user via ioctl or inherit flag on
   directory.
3. Misc changes around formatting & bounds checks on sysfs options.

See individual patches for more details.

Please pay close attention to the change in xfs_file_iomap_begin (patch 2),
the new version of the patch by-passes the xfs_file_iomap_begin_delay function
in the "realtime" case, since the realtime code here is not reachable/dead
(see assert in this function).  Instead, we by-pass this, hit
xfs_iomap_write_direct where the XFS_BMAPI_RTDATA will be passed on to the
xfs_bmapi_write function where it's set.

I'm curious if there is a better approach, and/or verification this is
sane/safe.

Patch set based off Linux 4.14-rc8 (commit
39dae59d66acd86d1de24294bd2f343fd5e7a625) located @
https://git.kernel.org/pub/scm/fs/xfs/xfs-linux.git .

Richard Wareing (3):
  xfs: Show realtime device stats on statfs calls if realtime flags set
  xfs: Set realtime flag based on initial allocation size
  xfs: Add realtime fallback if data device full

 Documentation/filesystems/xfs.txt | 27 +++++++++++-
 fs/xfs/libxfs/xfs_bmap.c          | 35 +++++++++++++++
 fs/xfs/libxfs/xfs_bmap.h          |  3 ++
 fs/xfs/xfs_bmap_util.c            |  3 ++
 fs/xfs/xfs_fsops.c                |  2 +
 fs/xfs/xfs_inode.c                |  6 +++
 fs/xfs/xfs_iomap.c                | 18 +++++++-
 fs/xfs/xfs_linux.h                |  2 +
 fs/xfs/xfs_mount.c                | 24 +++++++++++
 fs/xfs/xfs_mount.h                |  8 ++++
 fs/xfs/xfs_rtalloc.c              | 90 +++++++++++++++++++++++++++++++++++++++
 fs/xfs/xfs_rtalloc.h              |  2 +
 fs/xfs/xfs_super.c                |  8 ++++
 fs/xfs/xfs_sysfs.c                | 80 ++++++++++++++++++++++++++++++++++
 14 files changed, 305 insertions(+), 3 deletions(-)

-- 
2.9.5