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authorEric W. Biederman <ebiederm@xmission.com>2012-02-08 04:20:48 +0400
committerEric W. Biederman <ebiederm@xmission.com>2013-02-13 18:00:51 +0400
commita0a5386ac6400493cc2eb8b58583e56af0708730 (patch)
tree2c46bb450629c4ee3296857ae20d77d902554500 /fs/afs/fsclient.c
parentf74f70f8b10b435f5f20247e70d1d86b53a59685 (diff)
downloadlinux-a0a5386ac6400493cc2eb8b58583e56af0708730.tar.xz
afs: Support interacting with multiple user namespaces
Modify struct afs_file_status to store owner as a kuid_t and group as a kgid_t. In xdr_decode_AFSFetchStatus as owner is now a kuid_t and group is now a kgid_t don't use the EXTRACT macro. Instead perform the work of the extract macro explicitly. Read the value with ntohl and convert it to the appropriate type with make_kuid or make_kgid. Test if the value is different from what is stored in status and update changed. Update the value in status. In xdr_encode_AFS_StoreStatus call from_kuid or from_kgid as we are computing the on the wire encoding. Initialize uids with GLOBAL_ROOT_UID instead of 0. Initialize gids with GLOBAL_ROOT_GID instead of 0. Cc: David Howells <dhowells@redhat.com> Acked-by: Serge Hallyn <serge.hallyn@canonical.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'fs/afs/fsclient.c')
-rw-r--r--fs/afs/fsclient.c14
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/afs/fsclient.c b/fs/afs/fsclient.c
index b960ff05ea0b..c2e930ec2888 100644
--- a/fs/afs/fsclient.c
+++ b/fs/afs/fsclient.c
@@ -42,6 +42,8 @@ static void xdr_decode_AFSFetchStatus(const __be32 **_bp,
umode_t mode;
u64 data_version, size;
u32 changed = 0; /* becomes non-zero if ctime-type changes seen */
+ kuid_t owner;
+ kgid_t group;
#define EXTRACT(DST) \
do { \
@@ -56,7 +58,9 @@ static void xdr_decode_AFSFetchStatus(const __be32 **_bp,
size = ntohl(*bp++);
data_version = ntohl(*bp++);
EXTRACT(status->author);
- EXTRACT(status->owner);
+ owner = make_kuid(&init_user_ns, ntohl(*bp++));
+ changed |= !uid_eq(owner, status->owner);
+ status->owner = owner;
EXTRACT(status->caller_access); /* call ticket dependent */
EXTRACT(status->anon_access);
EXTRACT(status->mode);
@@ -65,7 +69,9 @@ static void xdr_decode_AFSFetchStatus(const __be32 **_bp,
bp++; /* seg size */
status->mtime_client = ntohl(*bp++);
status->mtime_server = ntohl(*bp++);
- EXTRACT(status->group);
+ group = make_kgid(&init_user_ns, ntohl(*bp++));
+ changed |= !gid_eq(group, status->group);
+ status->group = group;
bp++; /* sync counter */
data_version |= (u64) ntohl(*bp++) << 32;
EXTRACT(status->lock_count);
@@ -181,12 +187,12 @@ static void xdr_encode_AFS_StoreStatus(__be32 **_bp, struct iattr *attr)
if (attr->ia_valid & ATTR_UID) {
mask |= AFS_SET_OWNER;
- owner = attr->ia_uid;
+ owner = from_kuid(&init_user_ns, attr->ia_uid);
}
if (attr->ia_valid & ATTR_GID) {
mask |= AFS_SET_GROUP;
- group = attr->ia_gid;
+ group = from_kgid(&init_user_ns, attr->ia_gid);
}
if (attr->ia_valid & ATTR_MODE) {