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| author | Eric W. Biederman <ebiederm@xmission.com> | 2012-08-30 12:24:05 +0400 |
|---|---|---|
| committer | Eric W. Biederman <ebiederm@xmission.com> | 2012-09-18 12:01:37 +0400 |
| commit | f76d207a66c3a53defea67e7d36c3eb1b7d6d61d (patch) | |
| tree | 2d2a459c539d6f0b92e8ca856632e65f6c293af7 /include/linux/user_namespace.h | |
| parent | 69552c0c50f3f950f304fb07a4320e46f7f60c21 (diff) | |
| download | linux-f76d207a66c3a53defea67e7d36c3eb1b7d6d61d.tar.xz | |
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 'include/linux/user_namespace.h')
| -rw-r--r-- | include/linux/user_namespace.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/user_namespace.h b/include/linux/user_namespace.h index 4e72922e5a75..95142cae446a 100644 --- a/include/linux/user_namespace.h +++ b/include/linux/user_namespace.h @@ -20,6 +20,7 @@ struct uid_gid_map { /* 64 bytes -- 1 cache line */ struct user_namespace { struct uid_gid_map uid_map; struct uid_gid_map gid_map; + struct uid_gid_map projid_map; struct kref kref; struct user_namespace *parent; kuid_t owner; @@ -49,8 +50,10 @@ static inline void put_user_ns(struct user_namespace *ns) struct seq_operations; extern struct seq_operations proc_uid_seq_operations; extern struct seq_operations proc_gid_seq_operations; +extern struct seq_operations proc_projid_seq_operations; extern ssize_t proc_uid_map_write(struct file *, const char __user *, size_t, loff_t *); extern ssize_t proc_gid_map_write(struct file *, const char __user *, size_t, loff_t *); +extern ssize_t proc_projid_map_write(struct file *, const char __user *, size_t, loff_t *); #else static inline struct user_namespace *get_user_ns(struct user_namespace *ns) |