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NFS: new idmapper

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This patch creates a new idmapper system that uses the request-key function to
place a call into userspace to map user and group ids to names.  The old
idmapper was single threaded, which prevented more than one request from running
at a single time.  This means that a user would have to wait for an upcall to
finish before accessing a cached result.

The upcall result is stored on a keyring of type id_resolver.  See the file
Documentation/filesystems/nfs/idmapper.txt for instructions.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
[Trond: fix up the return value of nfs_idmap_lookup_name and clean up code]
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Bryan Schumaker
2010-09-29 15:41:49 -04:00
committed by Trond Myklebust
parent aa510da5bf
commit 955a857e06
8 changed files with 329 additions and 6 deletions
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31
include/linux/nfs_idmap.h
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@@ -66,13 +66,40 @@ struct idmap_msg {
/* Forward declaration to make this header independent of others */
struct nfs_client;
#ifdef CONFIG_NFS_USE_NEW_IDMAPPER
int nfs_idmap_init(void);
void nfs_idmap_quit(void);
static inline int nfs_idmap_new(struct nfs_client *clp)
{
return 0;
}
static inline void nfs_idmap_delete(struct nfs_client *clp)
{
}
#else /* CONFIG_NFS_USE_NEW_IDMAPPER not set */
static inline int nfs_idmap_init(void)
{
return 0;
}
static inline void nfs_idmap_quit(void)
{
}
int nfs_idmap_new(struct nfs_client *);
void nfs_idmap_delete(struct nfs_client *);
#endif /* CONFIG_NFS_USE_NEW_IDMAPPER */
int nfs_map_name_to_uid(struct nfs_client *, const char *, size_t, __u32 *);
int nfs_map_group_to_gid(struct nfs_client *, const char *, size_t, __u32 *);
int nfs_map_uid_to_name(struct nfs_client *, __u32, char *);
int nfs_map_gid_to_group(struct nfs_client *, __u32, char *);
int nfs_map_uid_to_name(struct nfs_client *, __u32, char *, size_t);
int nfs_map_gid_to_group(struct nfs_client *, __u32, char *, size_t);
extern unsigned int nfs_idmap_cache_timeout;
#endif /* __KERNEL__ */