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NFS: Store the legacy idmapper result in the keyring

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This patch removes the old hashmap-based caching and instead uses a
"request key actor" to place an upcall to the legacy idmapper rather
than going through /sbin/request-key.  This will only be used as a
fallback if /etc/request-key.conf isn't configured to use nfsidmap.

Signed-off-by: Bryan Schumaker <bjschuma@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Bryan Schumaker 2012-02-24 14:14:51 -05:00 committed by Trond Myklebust
parent 59e6b9c113
commit 57e62324e4
2 changed files with 180 additions and 413 deletions
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582
fs/nfs/idmap.c
View File

@ -34,42 +34,28 @@
* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/ */
#include <linux/types.h> #include <linux/types.h>
#include <linux/string.h> #include <linux/parser.h>
#include <linux/kernel.h> #include <linux/fs.h>
#include <linux/slab.h>
#include <linux/nfs_idmap.h> #include <linux/nfs_idmap.h>
#include <linux/nfs_fs.h> #include <net/net_namespace.h>
#include <linux/cred.h>
#include <linux/sunrpc/sched.h>
#include <linux/nfs4.h>
#include <linux/nfs_fs_sb.h>
#include <linux/keyctl.h>
#include <linux/key-type.h>
#include <linux/rcupdate.h>
#include <linux/err.h>
#include <keys/user-type.h>
/* include files needed by legacy idmapper */
#include <linux/module.h>
#include <linux/mutex.h>
#include <linux/init.h>
#include <linux/socket.h>
#include <linux/in.h>
#include <linux/sched.h>
#include <linux/sunrpc/clnt.h>
#include <linux/workqueue.h>
#include <linux/sunrpc/rpc_pipe_fs.h> #include <linux/sunrpc/rpc_pipe_fs.h>
#include <linux/nfs_fs.h> #include <linux/nfs_fs.h>
#include "nfs4_fs.h" #include <linux/nfs_fs_sb.h>
#include <linux/key.h>
#include <linux/keyctl.h>
#include <linux/key-type.h>
#include <keys/user-type.h>
#include <linux/module.h>
#include "internal.h" #include "internal.h"
#include "netns.h" #include "netns.h"
#define NFS_UINT_MAXLEN 11 #define NFS_UINT_MAXLEN 11
#define IDMAP_HASH_SZ 128
/* Default cache timeout is 10 minutes */ /* Default cache timeout is 10 minutes */
unsigned int nfs_idmap_cache_timeout = 600 * HZ; unsigned int nfs_idmap_cache_timeout = 600;
const struct cred *id_resolver_cache; const struct cred *id_resolver_cache;
struct key_type key_type_id_resolver_legacy;
/** /**
@ -261,8 +247,10 @@ static ssize_t nfs_idmap_get_desc(const char *name, size_t namelen,
return desclen; return desclen;
} }
static ssize_t nfs_idmap_request_key(const char *name, size_t namelen, static ssize_t nfs_idmap_request_key(struct key_type *key_type,
const char *type, void *data, size_t data_size) const char *name, size_t namelen,
const char *type, void *data,
size_t data_size, struct idmap *idmap)
{ {
const struct cred *saved_cred; const struct cred *saved_cred;
struct key *rkey; struct key *rkey;
@ -275,8 +263,12 @@ static ssize_t nfs_idmap_request_key(const char *name, size_t namelen,
goto out; goto out;
saved_cred = override_creds(id_resolver_cache); saved_cred = override_creds(id_resolver_cache);
rkey = request_key(&key_type_id_resolver, desc, ""); if (idmap)
rkey = request_key_with_auxdata(key_type, desc, "", 0, idmap);
else
rkey = request_key(&key_type_id_resolver, desc, "");
revert_creds(saved_cred); revert_creds(saved_cred);
kfree(desc); kfree(desc);
if (IS_ERR(rkey)) { if (IS_ERR(rkey)) {
ret = PTR_ERR(rkey); ret = PTR_ERR(rkey);
@ -309,31 +301,46 @@ static ssize_t nfs_idmap_request_key(const char *name, size_t namelen,
return ret; return ret;
} }
static ssize_t nfs_idmap_get_key(const char *name, size_t namelen,
const char *type, void *data,
size_t data_size, struct idmap *idmap)
{
ssize_t ret = nfs_idmap_request_key(&key_type_id_resolver,
name, namelen, type, data,
data_size, NULL);
if (ret < 0) {
ret = nfs_idmap_request_key(&key_type_id_resolver_legacy,
name, namelen, type, data,
data_size, idmap);
}
return ret;
}
/* ID -> Name */ /* ID -> Name */
static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf, size_t buflen) static ssize_t nfs_idmap_lookup_name(__u32 id, const char *type, char *buf,
size_t buflen, struct idmap *idmap)
{ {
char id_str[NFS_UINT_MAXLEN]; char id_str[NFS_UINT_MAXLEN];
int id_len; int id_len;
ssize_t ret; ssize_t ret;
id_len = snprintf(id_str, sizeof(id_str), "%u", id); id_len = snprintf(id_str, sizeof(id_str), "%u", id);
ret = nfs_idmap_request_key(id_str, id_len, type, buf, buflen); ret = nfs_idmap_get_key(id_str, id_len, type, buf, buflen, idmap);
if (ret < 0) if (ret < 0)
return -EINVAL; return -EINVAL;
return ret; return ret;
} }
/* Name -> ID */ /* Name -> ID */
static int nfs_idmap_lookup_id(const char *name, size_t namelen, static int nfs_idmap_lookup_id(const char *name, size_t namelen, const char *type,
const char *type, __u32 *id) __u32 *id, struct idmap *idmap)
{ {
char id_str[NFS_UINT_MAXLEN]; char id_str[NFS_UINT_MAXLEN];
long id_long; long id_long;
ssize_t data_size; ssize_t data_size;
int ret = 0; int ret = 0;
data_size = nfs_idmap_request_key(name, namelen, type, id_str, NFS_UINT_MAXLEN); data_size = nfs_idmap_get_key(name, namelen, type, id_str, NFS_UINT_MAXLEN, idmap);
if (data_size <= 0) { if (data_size <= 0) {
ret = -EINVAL; ret = -EINVAL;
} else { } else {
@ -344,54 +351,47 @@ static int nfs_idmap_lookup_id(const char *name, size_t namelen,
} }
/* idmap classic begins here */ /* idmap classic begins here */
static int param_set_idmap_timeout(const char *val, struct kernel_param *kp) module_param(nfs_idmap_cache_timeout, int, 0644);
{
char *endp;
int num = simple_strtol(val, &endp, 0);
int jif = num * HZ;
if (endp == val || *endp || num < 0 || jif < num)
return -EINVAL;
*((int *)kp->arg) = jif;
return 0;
}
module_param_call(idmap_cache_timeout, param_set_idmap_timeout, param_get_int,
&nfs_idmap_cache_timeout, 0644);
struct idmap_hashent {
unsigned long ih_expires;
__u32 ih_id;
size_t ih_namelen;
const char *ih_name;
};
struct idmap_hashtable {
__u8 h_type;
struct idmap_hashent *h_entries;
};
struct idmap { struct idmap {
struct rpc_pipe *idmap_pipe; struct rpc_pipe *idmap_pipe;
wait_queue_head_t idmap_wq; struct key_construction *idmap_key_cons;
struct idmap_msg idmap_im;
struct mutex idmap_lock; /* Serializes upcalls */
struct mutex idmap_im_lock; /* Protects the hashtable */
struct idmap_hashtable idmap_user_hash;
struct idmap_hashtable idmap_group_hash;
}; };
enum {
Opt_find_uid, Opt_find_gid, Opt_find_user, Opt_find_group, Opt_find_err
};
static const match_table_t nfs_idmap_tokens = {
{ Opt_find_uid, "uid:%s" },
{ Opt_find_gid, "gid:%s" },
{ Opt_find_user, "user:%s" },
{ Opt_find_group, "group:%s" },
{ Opt_find_err, NULL }
};
static int nfs_idmap_legacy_upcall(struct key_construction *, const char *, void *);
static ssize_t idmap_pipe_downcall(struct file *, const char __user *, static ssize_t idmap_pipe_downcall(struct file *, const char __user *,
size_t); size_t);
static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *); static void idmap_pipe_destroy_msg(struct rpc_pipe_msg *);
static unsigned int fnvhash32(const void *, size_t);
static const struct rpc_pipe_ops idmap_upcall_ops = { static const struct rpc_pipe_ops idmap_upcall_ops = {
.upcall = rpc_pipe_generic_upcall, .upcall = rpc_pipe_generic_upcall,
.downcall = idmap_pipe_downcall, .downcall = idmap_pipe_downcall,
.destroy_msg = idmap_pipe_destroy_msg, .destroy_msg = idmap_pipe_destroy_msg,
}; };
struct key_type key_type_id_resolver_legacy = {
.name = "id_resolver",
.instantiate = user_instantiate,
.match = user_match,
.revoke = user_revoke,
.destroy = user_destroy,
.describe = user_describe,
.read = user_read,
.request_key = nfs_idmap_legacy_upcall,
};
static void __nfs_idmap_unregister(struct rpc_pipe *pipe) static void __nfs_idmap_unregister(struct rpc_pipe *pipe)
{ {
if (pipe->dentry) if (pipe->dentry)
@ -468,38 +468,11 @@ nfs_idmap_new(struct nfs_client *clp)
return error; return error;
} }
idmap->idmap_pipe = pipe; idmap->idmap_pipe = pipe;
mutex_init(&idmap->idmap_lock);
mutex_init(&idmap->idmap_im_lock);
init_waitqueue_head(&idmap->idmap_wq);
idmap->idmap_user_hash.h_type = IDMAP_TYPE_USER;
idmap->idmap_group_hash.h_type = IDMAP_TYPE_GROUP;
clp->cl_idmap = idmap; clp->cl_idmap = idmap;
return 0; return 0;
} }
static void
idmap_alloc_hashtable(struct idmap_hashtable *h)
{
if (h->h_entries != NULL)
return;
h->h_entries = kcalloc(IDMAP_HASH_SZ,
sizeof(*h->h_entries),
GFP_KERNEL);
}
static void
idmap_free_hashtable(struct idmap_hashtable *h)
{
int i;
if (h->h_entries == NULL)
return;
for (i = 0; i < IDMAP_HASH_SZ; i++)
kfree(h->h_entries[i].ih_name);
kfree(h->h_entries);
}
void void
nfs_idmap_delete(struct nfs_client *clp) nfs_idmap_delete(struct nfs_client *clp)
{ {
@ -510,8 +483,6 @@ nfs_idmap_delete(struct nfs_client *clp)
nfs_idmap_unregister(clp, idmap->idmap_pipe); nfs_idmap_unregister(clp, idmap->idmap_pipe);
rpc_destroy_pipe_data(idmap->idmap_pipe); rpc_destroy_pipe_data(idmap->idmap_pipe);
clp->cl_idmap = NULL; clp->cl_idmap = NULL;
idmap_free_hashtable(&idmap->idmap_user_hash);
idmap_free_hashtable(&idmap->idmap_group_hash);
kfree(idmap); kfree(idmap);
} }
@ -617,222 +588,107 @@ void nfs_idmap_quit(void)
nfs_idmap_quit_keyring(); nfs_idmap_quit_keyring();
} }
/* static int nfs_idmap_prepare_message(char *desc, struct idmap_msg *im,
* Helper routines for manipulating the hashtable struct rpc_pipe_msg *msg)
*/
static inline struct idmap_hashent *
idmap_name_hash(struct idmap_hashtable* h, const char *name, size_t len)
{ {
if (h->h_entries == NULL) substring_t substr;
return NULL; int token, ret;
return &h->h_entries[fnvhash32(name, len) % IDMAP_HASH_SZ];
}
static struct idmap_hashent * memset(im, 0, sizeof(*im));
idmap_lookup_name(struct idmap_hashtable *h, const char *name, size_t len) memset(msg, 0, sizeof(*msg));
{
struct idmap_hashent *he = idmap_name_hash(h, name, len);
if (he == NULL) im->im_type = IDMAP_TYPE_GROUP;
return NULL; token = match_token(desc, nfs_idmap_tokens, &substr);
if (he->ih_namelen != len || memcmp(he->ih_name, name, len) != 0)
return NULL;
if (time_after(jiffies, he->ih_expires))
return NULL;
return he;
}
static inline struct idmap_hashent * switch (token) {
idmap_id_hash(struct idmap_hashtable* h, __u32 id) case Opt_find_uid:
{ im->im_type = IDMAP_TYPE_USER;
if (h->h_entries == NULL) case Opt_find_gid:
return NULL; im->im_conv = IDMAP_CONV_NAMETOID;
return &h->h_entries[fnvhash32(&id, sizeof(id)) % IDMAP_HASH_SZ]; ret = match_strlcpy(im->im_name, &substr, IDMAP_NAMESZ);
} break;
static struct idmap_hashent * case Opt_find_user:
idmap_lookup_id(struct idmap_hashtable *h, __u32 id) im->im_type = IDMAP_TYPE_USER;
{ case Opt_find_group:
struct idmap_hashent *he = idmap_id_hash(h, id); im->im_conv = IDMAP_CONV_IDTONAME;
ret = match_int(&substr, &im->im_id);
break;
if (he == NULL) default:
return NULL; ret = -EINVAL;
if (he->ih_id != id || he->ih_namelen == 0)
return NULL;
if (time_after(jiffies, he->ih_expires))
return NULL;
return he;
}
/*
* Routines for allocating new entries in the hashtable.
* For now, we just have 1 entry per bucket, so it's all
* pretty trivial.
*/
static inline struct idmap_hashent *
idmap_alloc_name(struct idmap_hashtable *h, char *name, size_t len)
{
idmap_alloc_hashtable(h);
return idmap_name_hash(h, name, len);
}
static inline struct idmap_hashent *
idmap_alloc_id(struct idmap_hashtable *h, __u32 id)
{
idmap_alloc_hashtable(h);
return idmap_id_hash(h, id);
}
static void
idmap_update_entry(struct idmap_hashent *he, const char *name,
size_t namelen, __u32 id)
{
char *str = kmalloc(namelen + 1, GFP_KERNEL);
if (str == NULL)
return;
kfree(he->ih_name);
he->ih_id = id;
memcpy(str, name, namelen);
str[namelen] = '\0';
he->ih_name = str;
he->ih_namelen = namelen;
he->ih_expires = jiffies + nfs_idmap_cache_timeout;
}
/*
* Name -> ID
*/
static int
nfs_idmap_id(struct idmap *idmap, struct idmap_hashtable *h,
const char *name, size_t namelen, __u32 *id)
{
struct rpc_pipe_msg msg;
struct idmap_msg *im;
struct idmap_hashent *he;
DECLARE_WAITQUEUE(wq, current);
int ret = -EIO;
im = &idmap->idmap_im;
/*
* String sanity checks
* Note that the userland daemon expects NUL terminated strings
*/
for (;;) {
if (namelen == 0)
return -EINVAL;
if (name[namelen-1] != '\0')
break;
namelen--;
}
if (namelen >= IDMAP_NAMESZ)
return -EINVAL;
mutex_lock(&idmap->idmap_lock);
mutex_lock(&idmap->idmap_im_lock);
he = idmap_lookup_name(h, name, namelen);
if (he != NULL) {
*id = he->ih_id;
ret = 0;
goto out; goto out;
} }
memset(im, 0, sizeof(*im)); msg->data = im;
memcpy(im->im_name, name, namelen); msg->len = sizeof(struct idmap_msg);
im->im_type = h->h_type; out:
im->im_conv = IDMAP_CONV_NAMETOID;
memset(&msg, 0, sizeof(msg));
msg.data = im;
msg.len = sizeof(*im);
add_wait_queue(&idmap->idmap_wq, &wq);
if (rpc_queue_upcall(idmap->idmap_pipe, &msg) < 0) {
remove_wait_queue(&idmap->idmap_wq, &wq);
goto out;
}
set_current_state(TASK_UNINTERRUPTIBLE);
mutex_unlock(&idmap->idmap_im_lock);
schedule();
__set_current_state(TASK_RUNNING);
remove_wait_queue(&idmap->idmap_wq, &wq);
mutex_lock(&idmap->idmap_im_lock);
if (im->im_status & IDMAP_STATUS_SUCCESS) {
*id = im->im_id;
ret = 0;
}
out:
memset(im, 0, sizeof(*im));
mutex_unlock(&idmap->idmap_im_lock);
mutex_unlock(&idmap->idmap_lock);
return ret; return ret;
} }
/* static int nfs_idmap_legacy_upcall(struct key_construction *cons,
* ID -> Name const char *op,
*/ void *aux)
static int
nfs_idmap_name(struct idmap *idmap, struct idmap_hashtable *h,
__u32 id, char *name)
{ {
struct rpc_pipe_msg msg; struct rpc_pipe_msg *msg;
struct idmap_msg *im; struct idmap_msg *im;
struct idmap_hashent *he; struct idmap *idmap = (struct idmap *)aux;
DECLARE_WAITQUEUE(wq, current); struct key *key = cons->key;
int ret = -EIO; int ret;
unsigned int len;
im = &idmap->idmap_im; /* msg and im are freed in idmap_pipe_destroy_msg */
msg = kmalloc(sizeof(*msg), GFP_KERNEL);
mutex_lock(&idmap->idmap_lock); if (IS_ERR(msg)) {
mutex_lock(&idmap->idmap_im_lock); ret = PTR_ERR(msg);
goto out0;
he = idmap_lookup_id(h, id);
if (he) {
memcpy(name, he->ih_name, he->ih_namelen);
ret = he->ih_namelen;
goto out;
} }
memset(im, 0, sizeof(*im)); im = kmalloc(sizeof(*im), GFP_KERNEL);
im->im_type = h->h_type; if (IS_ERR(im)) {
im->im_conv = IDMAP_CONV_IDTONAME; ret = PTR_ERR(im);
im->im_id = id; goto out1;
memset(&msg, 0, sizeof(msg));
msg.data = im;
msg.len = sizeof(*im);
add_wait_queue(&idmap->idmap_wq, &wq);
if (rpc_queue_upcall(idmap->idmap_pipe, &msg) < 0) {
remove_wait_queue(&idmap->idmap_wq, &wq);
goto out;
} }
set_current_state(TASK_UNINTERRUPTIBLE); ret = nfs_idmap_prepare_message(key->description, im, msg);
mutex_unlock(&idmap->idmap_im_lock); if (ret < 0)
schedule(); goto out2;
__set_current_state(TASK_RUNNING);
remove_wait_queue(&idmap->idmap_wq, &wq);
mutex_lock(&idmap->idmap_im_lock);
if (im->im_status & IDMAP_STATUS_SUCCESS) { idmap->idmap_key_cons = cons;
if ((len = strnlen(im->im_name, IDMAP_NAMESZ)) == 0)
goto out; return rpc_queue_upcall(idmap->idmap_pipe, msg);
memcpy(name, im->im_name, len);
ret = len; out2:
kfree(im);
out1:
kfree(msg);
out0:
complete_request_key(cons, ret);
return ret;
}
static int nfs_idmap_instantiate(struct key *key, struct key *authkey, char *data)
{
return key_instantiate_and_link(key, data, strlen(data) + 1,
id_resolver_cache->thread_keyring,
authkey);
}
static int nfs_idmap_read_message(struct idmap_msg *im, struct key *key, struct key *authkey)
{
char id_str[NFS_UINT_MAXLEN];
int ret = -EINVAL;
switch (im->im_conv) {
case IDMAP_CONV_NAMETOID:
sprintf(id_str, "%d", im->im_id);
ret = nfs_idmap_instantiate(key, authkey, id_str);
break;
case IDMAP_CONV_IDTONAME:
ret = nfs_idmap_instantiate(key, authkey, im->im_name);
break;
} }
out:
memset(im, 0, sizeof(*im));
mutex_unlock(&idmap->idmap_im_lock);
mutex_unlock(&idmap->idmap_lock);
return ret; return ret;
} }
@ -841,141 +697,69 @@ idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen)
{ {
struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode); struct rpc_inode *rpci = RPC_I(filp->f_path.dentry->d_inode);
struct idmap *idmap = (struct idmap *)rpci->private; struct idmap *idmap = (struct idmap *)rpci->private;
struct idmap_msg im_in, *im = &idmap->idmap_im; struct key_construction *cons = idmap->idmap_key_cons;
struct idmap_hashtable *h; struct idmap_msg im;
struct idmap_hashent *he = NULL;
size_t namelen_in; size_t namelen_in;
int ret; int ret;
if (mlen != sizeof(im_in)) if (mlen != sizeof(im)) {
return -ENOSPC; ret = -ENOSPC;
if (copy_from_user(&im_in, src, mlen) != 0)
return -EFAULT;
mutex_lock(&idmap->idmap_im_lock);
ret = mlen;
im->im_status = im_in.im_status;
/* If we got an error, terminate now, and wake up pending upcalls */
if (!(im_in.im_status & IDMAP_STATUS_SUCCESS)) {
wake_up(&idmap->idmap_wq);
goto out; goto out;
} }
/* Sanity checking of strings */ if (copy_from_user(&im, src, mlen) != 0) {
ret = -EINVAL; ret = -EFAULT;
namelen_in = strnlen(im_in.im_name, IDMAP_NAMESZ);
if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ)
goto out;
switch (im_in.im_type) {
case IDMAP_TYPE_USER:
h = &idmap->idmap_user_hash;
break;
case IDMAP_TYPE_GROUP:
h = &idmap->idmap_group_hash;
break;
default:
goto out;
}
switch (im_in.im_conv) {
case IDMAP_CONV_IDTONAME:
/* Did we match the current upcall? */
if (im->im_conv == IDMAP_CONV_IDTONAME
&& im->im_type == im_in.im_type
&& im->im_id == im_in.im_id) {
/* Yes: copy string, including the terminating '\0' */
memcpy(im->im_name, im_in.im_name, namelen_in);
im->im_name[namelen_in] = '\0';
wake_up(&idmap->idmap_wq);
}
he = idmap_alloc_id(h, im_in.im_id);
break;
case IDMAP_CONV_NAMETOID:
/* Did we match the current upcall? */
if (im->im_conv == IDMAP_CONV_NAMETOID
&& im->im_type == im_in.im_type
&& strnlen(im->im_name, IDMAP_NAMESZ) == namelen_in
&& memcmp(im->im_name, im_in.im_name, namelen_in) == 0) {
im->im_id = im_in.im_id;
wake_up(&idmap->idmap_wq);
}
he = idmap_alloc_name(h, im_in.im_name, namelen_in);
break;
default:
goto out; goto out;
} }
/* If the entry is valid, also copy it to the cache */ if (!(im.im_status & IDMAP_STATUS_SUCCESS)) {
if (he != NULL) ret = mlen;
idmap_update_entry(he, im_in.im_name, namelen_in, im_in.im_id); complete_request_key(idmap->idmap_key_cons, -ENOKEY);
ret = mlen; goto out_incomplete;
}
namelen_in = strnlen(im.im_name, IDMAP_NAMESZ);
if (namelen_in == 0 || namelen_in == IDMAP_NAMESZ) {
ret = -EINVAL;
goto out;
}
ret = nfs_idmap_read_message(&im, cons->key, cons->authkey);
if (ret >= 0) {
key_set_timeout(cons->key, nfs_idmap_cache_timeout);
ret = mlen;
}
out: out:
mutex_unlock(&idmap->idmap_im_lock); complete_request_key(idmap->idmap_key_cons, ret);
out_incomplete:
return ret; return ret;
} }
static void static void
idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg) idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg)
{ {
struct idmap_msg *im = msg->data; /* Free memory allocated in nfs_idmap_legacy_upcall() */
struct idmap *idmap = container_of(im, struct idmap, idmap_im); kfree(msg->data);
kfree(msg);
if (msg->errno >= 0)
return;
mutex_lock(&idmap->idmap_im_lock);
im->im_status = IDMAP_STATUS_LOOKUPFAIL;
wake_up(&idmap->idmap_wq);
mutex_unlock(&idmap->idmap_im_lock);
}
/*
* Fowler/Noll/Vo hash
* http://www.isthe.com/chongo/tech/comp/fnv/
*/
#define FNV_P_32 ((unsigned int)0x01000193) /* 16777619 */
#define FNV_1_32 ((unsigned int)0x811c9dc5) /* 2166136261 */
static unsigned int fnvhash32(const void *buf, size_t buflen)
{
const unsigned char *p, *end = (const unsigned char *)buf + buflen;
unsigned int hash = FNV_1_32;
for (p = buf; p < end; p++) {
hash *= FNV_P_32;
hash ^= (unsigned int)*p;
}
return hash;
} }
int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid) int nfs_map_name_to_uid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *uid)
{ {
struct idmap *idmap = server->nfs_client->cl_idmap; struct idmap *idmap = server->nfs_client->cl_idmap;
int ret = -EINVAL;
if (nfs_map_string_to_numeric(name, namelen, uid)) if (nfs_map_string_to_numeric(name, namelen, uid))
return 0; return 0;
ret = nfs_idmap_lookup_id(name, namelen, "uid", uid); return nfs_idmap_lookup_id(name, namelen, "uid", uid, idmap);
if (ret < 0)
ret = nfs_idmap_id(idmap, &idmap->idmap_user_hash, name, namelen, uid);
return ret;
} }
int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *gid) int nfs_map_group_to_gid(const struct nfs_server *server, const char *name, size_t namelen, __u32 *gid)
{ {
struct idmap *idmap = server->nfs_client->cl_idmap; struct idmap *idmap = server->nfs_client->cl_idmap;
int ret = -EINVAL;
if (nfs_map_string_to_numeric(name, namelen, gid)) if (nfs_map_string_to_numeric(name, namelen, gid))
return 0; return 0;
ret = nfs_idmap_lookup_id(name, namelen, "gid", gid); return nfs_idmap_lookup_id(name, namelen, "gid", gid, idmap);
if (ret < 0)
ret = nfs_idmap_id(idmap, &idmap->idmap_group_hash, name, namelen, gid);
return ret;
} }
int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen) int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, size_t buflen)
@ -983,11 +767,8 @@ int nfs_map_uid_to_name(const struct nfs_server *server, __u32 uid, char *buf, s
struct idmap *idmap = server->nfs_client->cl_idmap; struct idmap *idmap = server->nfs_client->cl_idmap;
int ret = -EINVAL; int ret = -EINVAL;
if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) { if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
ret = nfs_idmap_lookup_name(uid, "user", buf, buflen); ret = nfs_idmap_lookup_name(uid, "user", buf, buflen, idmap);
if (ret < 0)
ret = nfs_idmap_name(idmap, &idmap->idmap_user_hash, uid, buf);
}
if (ret < 0) if (ret < 0)
ret = nfs_map_numeric_to_string(uid, buf, buflen); ret = nfs_map_numeric_to_string(uid, buf, buflen);
return ret; return ret;
@ -997,11 +778,8 @@ int nfs_map_gid_to_group(const struct nfs_server *server, __u32 gid, char *buf,
struct idmap *idmap = server->nfs_client->cl_idmap; struct idmap *idmap = server->nfs_client->cl_idmap;
int ret = -EINVAL; int ret = -EINVAL;
if (!(server->caps & NFS_CAP_UIDGID_NOMAP)) { if (!(server->caps & NFS_CAP_UIDGID_NOMAP))
ret = nfs_idmap_lookup_name(gid, "group", buf, buflen); ret = nfs_idmap_lookup_name(gid, "group", buf, buflen, idmap);
if (ret < 0)
ret = nfs_idmap_name(idmap, &idmap->idmap_group_hash, gid, buf);
}
if (ret < 0) if (ret < 0)
ret = nfs_map_numeric_to_string(gid, buf, buflen); ret = nfs_map_numeric_to_string(gid, buf, buflen);
return ret; return ret;

11
include/linux/nfs_idmap.h
View File

@ -69,19 +69,8 @@ struct nfs_server;
struct nfs_fattr; struct nfs_fattr;
struct nfs4_string; struct nfs4_string;
#ifdef CONFIG_NFS_V4
int nfs_idmap_init(void); int nfs_idmap_init(void);
void nfs_idmap_quit(void); void nfs_idmap_quit(void);
#else
static inline int nfs_idmap_init(void)
{
return 0;
}
static inline void nfs_idmap_quit(void)
{}
#endif
int nfs_idmap_new(struct nfs_client *); int nfs_idmap_new(struct nfs_client *);
void nfs_idmap_delete(struct nfs_client *); void nfs_idmap_delete(struct nfs_client *);