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author | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
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committer | Linus Torvalds <torvalds@ppc970.osdl.org> | 2005-04-16 22:20:36 (GMT) |
commit | 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch) | |
tree | 0bba044c4ce775e45a88a51686b5d9f90697ea9d /fs/nfs/idmap.c | |
download | linux-fsl-qoriq-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz |
Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history,
even though we have it. We can create a separate "historical" git
archive of that later if we want to, and in the meantime it's about
3.2GB when imported into git - space that would just make the early
git days unnecessarily complicated, when we don't have a lot of good
infrastructure for it.
Let it rip!
Diffstat (limited to 'fs/nfs/idmap.c')
-rw-r--r-- | fs/nfs/idmap.c | 498 |
1 files changed, 498 insertions, 0 deletions
diff --git a/fs/nfs/idmap.c b/fs/nfs/idmap.c new file mode 100644 index 0000000..b74c4e3 --- /dev/null +++ b/fs/nfs/idmap.c @@ -0,0 +1,498 @@ +/* + * fs/nfs/idmap.c + * + * UID and GID to name mapping for clients. + * + * Copyright (c) 2002 The Regents of the University of Michigan. + * All rights reserved. + * + * Marius Aamodt Eriksen <marius@umich.edu> + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. Neither the name of the University nor the names of its + * contributors may be used to endorse or promote products derived + * from this software without specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED + * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF + * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE + * DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR + * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF + * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR + * BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF + * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING + * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS + * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <linux/module.h> +#include <linux/init.h> +#include <linux/types.h> +#include <linux/slab.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/nfs_fs_sb.h> +#include <linux/nfs_fs.h> + +#include <linux/nfs_idmap.h> + +#define IDMAP_HASH_SZ 128 + +struct idmap_hashent { + __u32 ih_id; + int ih_namelen; + char ih_name[IDMAP_NAMESZ]; +}; + +struct idmap_hashtable { + __u8 h_type; + struct idmap_hashent h_entries[IDMAP_HASH_SZ]; +}; + +struct idmap { + char idmap_path[48]; + struct dentry *idmap_dentry; + wait_queue_head_t idmap_wq; + struct idmap_msg idmap_im; + struct semaphore idmap_lock; /* Serializes upcalls */ + struct semaphore idmap_im_lock; /* Protects the hashtable */ + struct idmap_hashtable idmap_user_hash; + struct idmap_hashtable idmap_group_hash; +}; + +static ssize_t idmap_pipe_upcall(struct file *, struct rpc_pipe_msg *, + char __user *, size_t); +static ssize_t idmap_pipe_downcall(struct file *, const char __user *, + size_t); +void idmap_pipe_destroy_msg(struct rpc_pipe_msg *); + +static unsigned int fnvhash32(const void *, size_t); + +static struct rpc_pipe_ops idmap_upcall_ops = { + .upcall = idmap_pipe_upcall, + .downcall = idmap_pipe_downcall, + .destroy_msg = idmap_pipe_destroy_msg, +}; + +void +nfs_idmap_new(struct nfs4_client *clp) +{ + struct idmap *idmap; + + if (clp->cl_idmap != NULL) + return; + if ((idmap = kmalloc(sizeof(*idmap), GFP_KERNEL)) == NULL) + return; + + memset(idmap, 0, sizeof(*idmap)); + + snprintf(idmap->idmap_path, sizeof(idmap->idmap_path), + "%s/idmap", clp->cl_rpcclient->cl_pathname); + + idmap->idmap_dentry = rpc_mkpipe(idmap->idmap_path, + idmap, &idmap_upcall_ops, 0); + if (IS_ERR(idmap->idmap_dentry)) { + kfree(idmap); + return; + } + + init_MUTEX(&idmap->idmap_lock); + init_MUTEX(&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; +} + +void +nfs_idmap_delete(struct nfs4_client *clp) +{ + struct idmap *idmap = clp->cl_idmap; + + if (!idmap) + return; + rpc_unlink(idmap->idmap_path); + clp->cl_idmap = NULL; + kfree(idmap); +} + +/* + * Helper routines for manipulating the hashtable + */ +static inline struct idmap_hashent * +idmap_name_hash(struct idmap_hashtable* h, const char *name, size_t len) +{ + return &h->h_entries[fnvhash32(name, len) % IDMAP_HASH_SZ]; +} + +static struct idmap_hashent * +idmap_lookup_name(struct idmap_hashtable *h, const char *name, size_t len) +{ + struct idmap_hashent *he = idmap_name_hash(h, name, len); + + if (he->ih_namelen != len || memcmp(he->ih_name, name, len) != 0) + return NULL; + return he; +} + +static inline struct idmap_hashent * +idmap_id_hash(struct idmap_hashtable* h, __u32 id) +{ + return &h->h_entries[fnvhash32(&id, sizeof(id)) % IDMAP_HASH_SZ]; +} + +static struct idmap_hashent * +idmap_lookup_id(struct idmap_hashtable *h, __u32 id) +{ + struct idmap_hashent *he = idmap_id_hash(h, id); + if (he->ih_id != id || he->ih_namelen == 0) + 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, unsigned len) +{ + return idmap_name_hash(h, name, len); +} + +static inline struct idmap_hashent * +idmap_alloc_id(struct idmap_hashtable *h, __u32 id) +{ + return idmap_id_hash(h, id); +} + +static void +idmap_update_entry(struct idmap_hashent *he, const char *name, + size_t namelen, __u32 id) +{ + he->ih_id = id; + memcpy(he->ih_name, name, namelen); + he->ih_name[namelen] = '\0'; + he->ih_namelen = namelen; +} + +/* + * 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; + + down(&idmap->idmap_lock); + down(&idmap->idmap_im_lock); + + he = idmap_lookup_name(h, name, namelen); + if (he != NULL) { + *id = he->ih_id; + ret = 0; + goto out; + } + + memset(im, 0, sizeof(*im)); + memcpy(im->im_name, name, namelen); + + im->im_type = h->h_type; + 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_dentry->d_inode, &msg) < 0) { + remove_wait_queue(&idmap->idmap_wq, &wq); + goto out; + } + + set_current_state(TASK_UNINTERRUPTIBLE); + up(&idmap->idmap_im_lock); + schedule(); + current->state = TASK_RUNNING; + remove_wait_queue(&idmap->idmap_wq, &wq); + down(&idmap->idmap_im_lock); + + if (im->im_status & IDMAP_STATUS_SUCCESS) { + *id = im->im_id; + ret = 0; + } + + out: + memset(im, 0, sizeof(*im)); + up(&idmap->idmap_im_lock); + up(&idmap->idmap_lock); + return (ret); +} + +/* + * ID -> Name + */ +static int +nfs_idmap_name(struct idmap *idmap, struct idmap_hashtable *h, + __u32 id, char *name) +{ + struct rpc_pipe_msg msg; + struct idmap_msg *im; + struct idmap_hashent *he; + DECLARE_WAITQUEUE(wq, current); + int ret = -EIO; + unsigned int len; + + im = &idmap->idmap_im; + + down(&idmap->idmap_lock); + down(&idmap->idmap_im_lock); + + he = idmap_lookup_id(h, id); + if (he != 0) { + memcpy(name, he->ih_name, he->ih_namelen); + ret = he->ih_namelen; + goto out; + } + + memset(im, 0, sizeof(*im)); + im->im_type = h->h_type; + im->im_conv = IDMAP_CONV_IDTONAME; + im->im_id = id; + + 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_dentry->d_inode, &msg) < 0) { + remove_wait_queue(&idmap->idmap_wq, &wq); + goto out; + } + + set_current_state(TASK_UNINTERRUPTIBLE); + up(&idmap->idmap_im_lock); + schedule(); + current->state = TASK_RUNNING; + remove_wait_queue(&idmap->idmap_wq, &wq); + down(&idmap->idmap_im_lock); + + if (im->im_status & IDMAP_STATUS_SUCCESS) { + if ((len = strnlen(im->im_name, IDMAP_NAMESZ)) == 0) + goto out; + memcpy(name, im->im_name, len); + ret = len; + } + + out: + memset(im, 0, sizeof(*im)); + up(&idmap->idmap_im_lock); + up(&idmap->idmap_lock); + return ret; +} + +/* RPC pipefs upcall/downcall routines */ +static ssize_t +idmap_pipe_upcall(struct file *filp, struct rpc_pipe_msg *msg, + char __user *dst, size_t buflen) +{ + char *data = (char *)msg->data + msg->copied; + ssize_t mlen = msg->len - msg->copied; + ssize_t left; + + if (mlen > buflen) + mlen = buflen; + + left = copy_to_user(dst, data, mlen); + if (left < 0) { + msg->errno = left; + return left; + } + mlen -= left; + msg->copied += mlen; + msg->errno = 0; + return mlen; +} + +static ssize_t +idmap_pipe_downcall(struct file *filp, const char __user *src, size_t mlen) +{ + struct rpc_inode *rpci = RPC_I(filp->f_dentry->d_inode); + struct idmap *idmap = (struct idmap *)rpci->private; + struct idmap_msg im_in, *im = &idmap->idmap_im; + struct idmap_hashtable *h; + struct idmap_hashent *he = NULL; + int namelen_in; + int ret; + + if (mlen != sizeof(im_in)) + return (-ENOSPC); + + if (copy_from_user(&im_in, src, mlen) != 0) + return (-EFAULT); + + down(&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; + } + + /* Sanity checking of strings */ + ret = -EINVAL; + 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; + } + + /* If the entry is valid, also copy it to the cache */ + if (he != NULL) + idmap_update_entry(he, im_in.im_name, namelen_in, im_in.im_id); + ret = mlen; +out: + up(&idmap->idmap_im_lock); + return ret; +} + +void +idmap_pipe_destroy_msg(struct rpc_pipe_msg *msg) +{ + struct idmap_msg *im = msg->data; + struct idmap *idmap = container_of(im, struct idmap, idmap_im); + + if (msg->errno >= 0) + return; + down(&idmap->idmap_im_lock); + im->im_status = IDMAP_STATUS_LOOKUPFAIL; + wake_up(&idmap->idmap_wq); + up(&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(struct nfs4_client *clp, const char *name, size_t namelen, __u32 *uid) +{ + struct idmap *idmap = clp->cl_idmap; + + return nfs_idmap_id(idmap, &idmap->idmap_user_hash, name, namelen, uid); +} + +int nfs_map_group_to_gid(struct nfs4_client *clp, const char *name, size_t namelen, __u32 *uid) +{ + struct idmap *idmap = clp->cl_idmap; + + return nfs_idmap_id(idmap, &idmap->idmap_group_hash, name, namelen, uid); +} + +int nfs_map_uid_to_name(struct nfs4_client *clp, __u32 uid, char *buf) +{ + struct idmap *idmap = clp->cl_idmap; + + return nfs_idmap_name(idmap, &idmap->idmap_user_hash, uid, buf); +} +int nfs_map_gid_to_group(struct nfs4_client *clp, __u32 uid, char *buf) +{ + struct idmap *idmap = clp->cl_idmap; + + return nfs_idmap_name(idmap, &idmap->idmap_group_hash, uid, buf); +} + |