[PATCH V2 0/3] Supporting same fsid mounting through a compat_ro feature

["Guilherme G. Piccoli" <gpiccoli@igalia.com>]

Hi all, this is the 2nd attempt of supporting same fsid mounting
on btrfs. V1 is here:
https://lore.kernel.org/linux-btrfs/20230504170708.787361-1-gpiccoli@igalia.com/

The mechanism used to achieve that in V2 was a mix between the suggestion
from JohnS (spoofed fsid) and Qu (a single-dev compat_ro flag) - it is
still based in the metadata_uuid feature, leveraging that infrastructure
since it prevents lots of corner cases, like sysfs same-fsid crashes.

The patches are based on kernel v6.5-rc3 with Anand's metadata_uuid refactor
part 2 on top of it [0]; the btrfs-progs patch is based on "v6.3.3".

Comments/suggestions and overall feedback is much appreciated - tnx in advance!
Cheers,

Guilherme


[0] https://lore.kernel.org/linux-btrfs/cover.1690792823.git.anand.jain@oracle.com/


Guilherme G. Piccoli (3):
  btrfs-progs: Add the single-dev feature (to both mkfs/tune)
  btrfs: Introduce the single-dev feature
  btrfs: Add parameter to force devices behave as single-dev ones

btrfs-progs:
 common/fsfeatures.c        |  7 ++++
 kernel-shared/ctree.h      |  3 +-
 kernel-shared/uapi/btrfs.h |  7 ++++
 mkfs/main.c                |  4 ++-
 tune/main.c                | 72 +++++++++++++++++++++++---------------
 5 files changed, 63 insertions(+), 30 deletions(-)

kernel:
 fs/btrfs/disk-io.c         |  19 +++++-
 fs/btrfs/fs.h              |   3 +-
 fs/btrfs/ioctl.c           |  18 +++++
 fs/btrfs/super.c           |  13 ++--
 fs/btrfs/super.h           |   2 +
 fs/btrfs/volumes.c         | 136 +++++++++++++++++++++++++++++++------
 fs/btrfs/volumes.h         |   5 +-
 include/uapi/linux/btrfs.h |   7 ++
 8 files changed, 175 insertions(+), 28 deletions(-)

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2.41.0