[PATCH v3 0/2] squashfs/squashfs-tools: Add posix acl support

From: Geliang Tang
Date: Tue Aug 07 2018 - 05:49:16 EST


When we use mksquashfs tool to create a squashfs image from the files which
have POSIX ACLs(Access Control Lists), we get these errors:

Unrecognised xattr prefix system.posix_acl_access
Unrecognised xattr prefix system.posix_acl_default

This patcheset adds posix acl support to squashfs to fix this problem. Patch
#1 for kerenl tree and patch #2 for squashfs-tools tree.

---

Testcase:

$ mkdir root
$ getfacl root
# file: root
# owner: tgl
# group: tgl
user::rwx
group::r-x
other::r-x
$ setfacl -m u:tgl:rw root
$ setfacl -m d:tgl:rw root
$ getfacl root
# file: root
# owner: tgl
# group: tgl
user::rwx
user:tgl:rw-
group::r-x
mask::rwx
other::r-x
default:user::rwx
default:user:tgl:rw-
default:group::r-x
default:mask::rwx
default:other::r-x
$ getfattr -m . -d root
# file: root
system.posix_acl_access=0sAgAAAAEABwD/////AgAGAOgDAAAEAAUA/////xAABwD/////IAAFAP////8=
system.posix_acl_default=0sAgAAAAEABwD/////AgAGAOgDAAAEAAUA/////xAABwD/////IAAFAP////8=

$ mksquashfs root root.img
$ sudo mount root.img /mnt/squash/

$ cd /mnt
$ getfacl squash
# file: squash
# owner: tgl
# group: tgl
user::rwx
user:tgl:rw-
group::r-x
mask::rwx
other::r-x
default:user::rwx
default:user:tgl:rw-
default:group::r-x
default:mask::rwx
default:other::r-x
$ getfattr -m . -d squash
# file: squash
system.posix_acl_access=0sAgAAAAEABwD/////AgAGAOgDAAAEAAUA/////xAABwD/////IAAFAP////8=
system.posix_acl_default=0sAgAAAAEABwD/////AgAGAOgDAAAEAAUA/////xAABwD/////IAAFAP////8=

---

Geliang Tang (1):
squashfs: Add posix acl support

Documentation/filesystems/squashfs.txt | 2 -
fs/squashfs/Kconfig | 11 ++++
fs/squashfs/Makefile | 1 +
fs/squashfs/acl.c | 69 ++++++++++++++++++++++++++
fs/squashfs/acl.h | 31 ++++++++++++
fs/squashfs/inode.c | 4 +-
fs/squashfs/namei.c | 6 ++-
fs/squashfs/squashfs_fs.h | 12 +++--
fs/squashfs/super.c | 3 ++
fs/squashfs/symlink.c | 6 ++-
fs/squashfs/xattr.c | 31 +++++++++++-
fs/squashfs/xattr.h | 8 +++
12 files changed, 171 insertions(+), 13 deletions(-)
create mode 100644 fs/squashfs/acl.c
create mode 100644 fs/squashfs/acl.h

---

Geliang Tang (1):
squashfs-tools: Add posix acl support

squashfs-tools/read_xattrs.c | 2 ++
squashfs-tools/squashfs_fs.h | 12 +++++++-----
2 files changed, 9 insertions(+), 5 deletions(-)

--
2.17.1