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authorEric W. Biederman <ebiederm@xmission.com>2012-08-30 01:24:05 -0700
committerEric W. Biederman <ebiederm@xmission.com>2012-09-18 01:01:37 -0700
commitf76d207a66c3a53defea67e7d36c3eb1b7d6d61d (patch)
tree2d2a459c539d6f0b92e8ca856632e65f6c293af7 /kernel/user.c
parent69552c0c50f3f950f304fb07a4320e46f7f60c21 (diff)
userns: Add kprojid_t and associated infrastructure in projid.h
Implement kprojid_t a cousin of the kuid_t and kgid_t. The per user namespace mapping of project id values can be set with /proc/<pid>/projid_map. A full compliment of helpers is provided: make_kprojid, from_kprojid, from_kprojid_munged, kporjid_has_mapping, projid_valid, projid_eq, projid_eq, projid_lt. Project identifiers are part of the generic disk quota interface, although it appears only xfs implements project identifiers currently. The xfs code allows anyone who has permission to set the project identifier on a file to use any project identifier so when setting up the user namespace project identifier mappings I do not require a capability. Cc: Dave Chinner <david@fromorbit.com> Cc: Jan Kara <jack@suse.cz> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
Diffstat (limited to 'kernel/user.c')
-rw-r--r--kernel/user.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/kernel/user.c b/kernel/user.c
index b815fefbe76..750acffbe9e 100644
--- a/kernel/user.c
+++ b/kernel/user.c
@@ -38,6 +38,14 @@ struct user_namespace init_user_ns = {
.count = 4294967295U,
},
},
+ .projid_map = {
+ .nr_extents = 1,
+ .extent[0] = {
+ .first = 0,
+ .lower_first = 0,
+ .count = 4294967295U,
+ },
+ },
.kref = {
.refcount = ATOMIC_INIT(3),
},