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-rw-r--r--fs/nfs/idmap.c83
1 files changed, 83 insertions, 0 deletions
diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c
index 47d1c6ff2d8e..2c05f1991e1e 100644
--- a/fs/nfs/idmap.c
+++ b/fs/nfs/idmap.c
@@ -38,6 +38,89 @@
38#include <linux/kernel.h> 38#include <linux/kernel.h>
39#include <linux/slab.h> 39#include <linux/slab.h>
40#include <linux/nfs_idmap.h> 40#include <linux/nfs_idmap.h>
41#include <linux/nfs_fs.h>
42
43/**
44 * nfs_fattr_init_names - initialise the nfs_fattr owner_name/group_name fields
45 * @fattr: fully initialised struct nfs_fattr
46 * @owner_name: owner name string cache
47 * @group_name: group name string cache
48 */
49void nfs_fattr_init_names(struct nfs_fattr *fattr,
50 struct nfs4_string *owner_name,
51 struct nfs4_string *group_name)
52{
53 fattr->owner_name = owner_name;
54 fattr->group_name = group_name;
55}
56
57static void nfs_fattr_free_owner_name(struct nfs_fattr *fattr)
58{
59 fattr->valid &= ~NFS_ATTR_FATTR_OWNER_NAME;
60 kfree(fattr->owner_name->data);
61}
62
63static void nfs_fattr_free_group_name(struct nfs_fattr *fattr)
64{
65 fattr->valid &= ~NFS_ATTR_FATTR_GROUP_NAME;
66 kfree(fattr->group_name->data);
67}
68
69static bool nfs_fattr_map_owner_name(struct nfs_server *server, struct nfs_fattr *fattr)
70{
71 struct nfs4_string *owner = fattr->owner_name;
72 __u32 uid;
73
74 if (!(fattr->valid & NFS_ATTR_FATTR_OWNER_NAME))
75 return false;
76 if (nfs_map_name_to_uid(server, owner->data, owner->len, &uid) == 0) {
77 fattr->uid = uid;
78 fattr->valid |= NFS_ATTR_FATTR_OWNER;
79 }
80 return true;
81}
82
83static bool nfs_fattr_map_group_name(struct nfs_server *server, struct nfs_fattr *fattr)
84{
85 struct nfs4_string *group = fattr->group_name;
86 __u32 gid;
87
88 if (!(fattr->valid & NFS_ATTR_FATTR_GROUP_NAME))
89 return false;
90 if (nfs_map_group_to_gid(server, group->data, group->len, &gid) == 0) {
91 fattr->gid = gid;
92 fattr->valid |= NFS_ATTR_FATTR_GROUP;
93 }
94 return true;
95}
96
97/**
98 * nfs_fattr_free_names - free up the NFSv4 owner and group strings
99 * @fattr: a fully initialised nfs_fattr structure
100 */
101void nfs_fattr_free_names(struct nfs_fattr *fattr)
102{
103 if (fattr->valid & NFS_ATTR_FATTR_OWNER_NAME)
104 nfs_fattr_free_owner_name(fattr);
105 if (fattr->valid & NFS_ATTR_FATTR_GROUP_NAME)
106 nfs_fattr_free_group_name(fattr);
107}
108
109/**
110 * nfs_fattr_map_and_free_names - map owner/group strings into uid/gid and free
111 * @server: pointer to the filesystem nfs_server structure
112 * @fattr: a fully initialised nfs_fattr structure
113 *
114 * This helper maps the cached NFSv4 owner/group strings in fattr into
115 * their numeric uid/gid equivalents, and then frees the cached strings.
116 */
117void nfs_fattr_map_and_free_names(struct nfs_server *server, struct nfs_fattr *fattr)
118{
119 if (nfs_fattr_map_owner_name(server, fattr))
120 nfs_fattr_free_owner_name(fattr);
121 if (nfs_fattr_map_group_name(server, fattr))
122 nfs_fattr_free_group_name(fattr);
123}
41 124
42static int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res) 125static int nfs_map_string_to_numeric(const char *name, size_t namelen, __u32 *res)
43{ 126{