Linux-2.6.12-rc2v2.6.12-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!

1 files changed, 588 insertions, 0 deletions

diff --git a/fs/nfsd/nfs4idmap.c b/fs/nfsd/nfs4idmap.c
new file mode 100644
index 00000000000..4ba540841cf
--- /dev/null
+++ b/fs/nfsd/nfs4idmap.c
@@ -0,0 +1,588 @@
+/*
+ *  fs/nfsd/nfs4idmap.c
+ *
+ *  Mapping of UID/GIDs to name and vice versa.
+ *
+ *  Copyright (c) 2002, 2003 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/config.h>
+#include <linux/module.h>
+#include <linux/init.h>
+
+#include <linux/mm.h>
+#include <linux/utsname.h>
+#include <linux/errno.h>
+#include <linux/string.h>
+#include <linux/sunrpc/clnt.h>
+#include <linux/nfs.h>
+#include <linux/nfs4.h>
+#include <linux/nfs_fs.h>
+#include <linux/nfs_page.h>
+#include <linux/smp_lock.h>
+#include <linux/sunrpc/cache.h>
+#include <linux/nfsd_idmap.h>
+#include <linux/list.h>
+#include <linux/sched.h>
+#include <linux/time.h>
+#include <linux/seq_file.h>
+#include <linux/sunrpc/svcauth.h>
+
+/*
+ * Cache entry
+ */
+
+/*
+ * XXX we know that IDMAP_NAMESZ < PAGE_SIZE, but it's ugly to rely on
+ * that.
+ */
+
+#define IDMAP_TYPE_USER  0
+#define IDMAP_TYPE_GROUP 1
+
+struct ent {
+	struct cache_head h;
+	int               type;		       /* User / Group */
+	uid_t             id;
+	char              name[IDMAP_NAMESZ];
+	char              authname[IDMAP_NAMESZ];
+};
+
+#define DefineSimpleCacheLookupMap(STRUCT, FUNC)			\
+        DefineCacheLookup(struct STRUCT, h, FUNC##_lookup,		\
+        (struct STRUCT *item, int set), /*no setup */,			\
+	& FUNC##_cache, FUNC##_hash(item), FUNC##_match(item, tmp),	\
+	STRUCT##_init(new, item), STRUCT##_update(tmp, item), 0)
+
+/* Common entry handling */
+
+#define ENT_HASHBITS          8
+#define ENT_HASHMAX           (1 << ENT_HASHBITS)
+#define ENT_HASHMASK          (ENT_HASHMAX - 1)
+
+static inline void
+ent_init(struct ent *new, struct ent *itm)
+{
+	new->id = itm->id;
+	new->type = itm->type;
+
+	strlcpy(new->name, itm->name, sizeof(new->name));
+	strlcpy(new->authname, itm->authname, sizeof(new->name));
+}
+
+static inline void
+ent_update(struct ent *new, struct ent *itm)
+{
+	ent_init(new, itm);
+}
+
+void
+ent_put(struct cache_head *ch, struct cache_detail *cd)
+{
+	if (cache_put(ch, cd)) {
+		struct ent *map = container_of(ch, struct ent, h);
+		kfree(map);
+	}
+}
+
+/*
+ * ID -> Name cache
+ */
+
+static struct cache_head *idtoname_table[ENT_HASHMAX];
+
+static uint32_t
+idtoname_hash(struct ent *ent)
+{
+	uint32_t hash;
+
+	hash = hash_str(ent->authname, ENT_HASHBITS);
+	hash = hash_long(hash ^ ent->id, ENT_HASHBITS);
+
+	/* Flip LSB for user/group */
+	if (ent->type == IDMAP_TYPE_GROUP)
+		hash ^= 1;
+
+	return hash;
+}
+
+static void
+idtoname_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
+    int *blen)
+{
+ 	struct ent *ent = container_of(ch, struct ent, h);
+	char idstr[11];
+
+	qword_add(bpp, blen, ent->authname);
+	snprintf(idstr, sizeof(idstr), "%d", ent->id);
+	qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
+	qword_add(bpp, blen, idstr);
+
+	(*bpp)[-1] = '\n';
+}
+
+static inline int
+idtoname_match(struct ent *a, struct ent *b)
+{
+	return (a->id == b->id && a->type == b->type &&
+	    strcmp(a->authname, b->authname) == 0);
+}
+
+static int
+idtoname_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
+{
+	struct ent *ent;
+
+	if (h == NULL) {
+		seq_puts(m, "#domain type id [name]\n");
+		return 0;
+	}
+	ent = container_of(h, struct ent, h);
+	seq_printf(m, "%s %s %d", ent->authname,
+			ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
+			ent->id);
+	if (test_bit(CACHE_VALID, &h->flags))
+		seq_printf(m, " %s", ent->name);
+	seq_printf(m, "\n");
+	return 0;
+}
+
+static void
+warn_no_idmapd(struct cache_detail *detail)
+{
+	printk("nfsd: nfsv4 idmapping failing: has idmapd %s?\n",
+			detail->last_close? "died" : "not been started");
+}
+
+
+static int         idtoname_parse(struct cache_detail *, char *, int);
+static struct ent *idtoname_lookup(struct ent *, int);
+
+struct cache_detail idtoname_cache = {
+	.hash_size	= ENT_HASHMAX,
+	.hash_table	= idtoname_table,
+	.name		= "nfs4.idtoname",
+	.cache_put	= ent_put,
+	.cache_request	= idtoname_request,
+	.cache_parse	= idtoname_parse,
+	.cache_show	= idtoname_show,
+	.warn_no_listener = warn_no_idmapd,
+};
+
+int
+idtoname_parse(struct cache_detail *cd, char *buf, int buflen)
+{
+	struct ent ent, *res;
+	char *buf1, *bp;
+	int error = -EINVAL;
+
+	if (buf[buflen - 1] != '\n')
+		return (-EINVAL);
+	buf[buflen - 1]= '\0';
+
+	buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
+	if (buf1 == NULL)
+		return (-ENOMEM);
+
+	memset(&ent, 0, sizeof(ent));
+
+	/* Authentication name */
+	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
+		goto out;
+	memcpy(ent.authname, buf1, sizeof(ent.authname));
+
+	/* Type */
+	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
+		goto out;
+	ent.type = strcmp(buf1, "user") == 0 ?
+		IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
+
+	/* ID */
+	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
+		goto out;
+	ent.id = simple_strtoul(buf1, &bp, 10);
+	if (bp == buf1)
+		goto out;
+
+	/* expiry */
+	ent.h.expiry_time = get_expiry(&buf);
+	if (ent.h.expiry_time == 0)
+		goto out;
+
+	/* Name */
+	error = qword_get(&buf, buf1, PAGE_SIZE);
+	if (error == -EINVAL)
+		goto out;
+	if (error == -ENOENT)
+		set_bit(CACHE_NEGATIVE, &ent.h.flags);
+	else {
+		if (error >= IDMAP_NAMESZ) {
+			error = -EINVAL;
+			goto out;
+		}
+		memcpy(ent.name, buf1, sizeof(ent.name));
+	}
+	error = -ENOMEM;
+	if ((res = idtoname_lookup(&ent, 1)) == NULL)
+		goto out;
+
+	ent_put(&res->h, &idtoname_cache);
+
+	error = 0;
+out:
+	kfree(buf1);
+
+	return error;
+}
+
+static DefineSimpleCacheLookupMap(ent, idtoname);
+
+/*
+ * Name -> ID cache
+ */
+
+static struct cache_head *nametoid_table[ENT_HASHMAX];
+
+static inline int
+nametoid_hash(struct ent *ent)
+{
+	return hash_str(ent->name, ENT_HASHBITS);
+}
+
+void
+nametoid_request(struct cache_detail *cd, struct cache_head *ch, char **bpp,
+    int *blen)
+{
+ 	struct ent *ent = container_of(ch, struct ent, h);
+
+	qword_add(bpp, blen, ent->authname);
+	qword_add(bpp, blen, ent->type == IDMAP_TYPE_GROUP ? "group" : "user");
+	qword_add(bpp, blen, ent->name);
+
+	(*bpp)[-1] = '\n';
+}
+
+static inline int
+nametoid_match(struct ent *a, struct ent *b)
+{
+	return (a->type == b->type && strcmp(a->name, b->name) == 0 &&
+	    strcmp(a->authname, b->authname) == 0);
+}
+
+static int
+nametoid_show(struct seq_file *m, struct cache_detail *cd, struct cache_head *h)
+{
+	struct ent *ent;
+
+	if (h == NULL) {
+		seq_puts(m, "#domain type name [id]\n");
+		return 0;
+	}
+	ent = container_of(h, struct ent, h);
+	seq_printf(m, "%s %s %s", ent->authname,
+			ent->type == IDMAP_TYPE_GROUP ? "group" : "user",
+			ent->name);
+	if (test_bit(CACHE_VALID, &h->flags))
+		seq_printf(m, " %d", ent->id);
+	seq_printf(m, "\n");
+	return 0;
+}
+
+static struct ent *nametoid_lookup(struct ent *, int);
+int                nametoid_parse(struct cache_detail *, char *, int);
+
+struct cache_detail nametoid_cache = {
+	.hash_size	= ENT_HASHMAX,
+	.hash_table	= nametoid_table,
+	.name		= "nfs4.nametoid",
+	.cache_put	= ent_put,
+	.cache_request	= nametoid_request,
+	.cache_parse	= nametoid_parse,
+	.cache_show	= nametoid_show,
+	.warn_no_listener = warn_no_idmapd,
+};
+
+int
+nametoid_parse(struct cache_detail *cd, char *buf, int buflen)
+{
+	struct ent ent, *res;
+	char *buf1;
+	int error = -EINVAL;
+
+	if (buf[buflen - 1] != '\n')
+		return (-EINVAL);
+	buf[buflen - 1]= '\0';
+
+	buf1 = kmalloc(PAGE_SIZE, GFP_KERNEL);
+	if (buf1 == NULL)
+		return (-ENOMEM);
+
+	memset(&ent, 0, sizeof(ent));
+
+	/* Authentication name */
+	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
+		goto out;
+	memcpy(ent.authname, buf1, sizeof(ent.authname));
+
+	/* Type */
+	if (qword_get(&buf, buf1, PAGE_SIZE) <= 0)
+		goto out;
+	ent.type = strcmp(buf1, "user") == 0 ?
+		IDMAP_TYPE_USER : IDMAP_TYPE_GROUP;
+
+	/* Name */
+	error = qword_get(&buf, buf1, PAGE_SIZE);
+	if (error <= 0 || error >= IDMAP_NAMESZ)
+		goto out;
+	memcpy(ent.name, buf1, sizeof(ent.name));
+
+	/* expiry */
+	ent.h.expiry_time = get_expiry(&buf);
+	if (ent.h.expiry_time == 0)
+		goto out;
+
+	/* ID */
+	error = get_int(&buf, &ent.id);
+	if (error == -EINVAL)
+		goto out;
+	if (error == -ENOENT)
+		set_bit(CACHE_NEGATIVE, &ent.h.flags);
+
+	error = -ENOMEM;
+	if ((res = nametoid_lookup(&ent, 1)) == NULL)
+		goto out;
+
+	ent_put(&res->h, &nametoid_cache);
+	error = 0;
+out:
+	kfree(buf1);
+
+	return (error);
+}
+
+static DefineSimpleCacheLookupMap(ent, nametoid);
+
+/*
+ * Exported API
+ */
+
+void
+nfsd_idmap_init(void)
+{
+	cache_register(&idtoname_cache);
+	cache_register(&nametoid_cache);
+}
+
+void
+nfsd_idmap_shutdown(void)
+{
+	cache_unregister(&idtoname_cache);
+	cache_unregister(&nametoid_cache);
+}
+
+/*
+ * Deferred request handling
+ */
+
+struct idmap_defer_req {
+       struct cache_req		req;
+       struct cache_deferred_req deferred_req;
+       wait_queue_head_t	waitq;
+       atomic_t			count;
+};
+
+static inline void
+put_mdr(struct idmap_defer_req *mdr)
+{
+	if (atomic_dec_and_test(&mdr->count))
+		kfree(mdr);
+}
+
+static inline void
+get_mdr(struct idmap_defer_req *mdr)
+{
+	atomic_inc(&mdr->count);
+}
+
+static void
+idmap_revisit(struct cache_deferred_req *dreq, int toomany)
+{
+	struct idmap_defer_req *mdr =
+		container_of(dreq, struct idmap_defer_req, deferred_req);
+
+	wake_up(&mdr->waitq);
+	put_mdr(mdr);
+}
+
+static struct cache_deferred_req *
+idmap_defer(struct cache_req *req)
+{
+	struct idmap_defer_req *mdr =
+		container_of(req, struct idmap_defer_req, req);
+
+	mdr->deferred_req.revisit = idmap_revisit;
+	get_mdr(mdr);
+	return (&mdr->deferred_req);
+}
+
+static inline int
+do_idmap_lookup(struct ent *(*lookup_fn)(struct ent *, int), struct ent *key,
+		struct cache_detail *detail, struct ent **item,
+		struct idmap_defer_req *mdr)
+{
+	*item = lookup_fn(key, 0);
+	if (!*item)
+		return -ENOMEM;
+	return cache_check(detail, &(*item)->h, &mdr->req);
+}
+
+static inline int
+do_idmap_lookup_nowait(struct ent *(*lookup_fn)(struct ent *, int),
+			struct ent *key, struct cache_detail *detail,
+			struct ent **item)
+{
+	int ret = -ENOMEM;
+
+	*item = lookup_fn(key, 0);
+	if (!*item)
+		goto out_err;
+	ret = -ETIMEDOUT;
+	if (!test_bit(CACHE_VALID, &(*item)->h.flags)
+			|| (*item)->h.expiry_time < get_seconds()
+			|| detail->flush_time > (*item)->h.last_refresh)
+		goto out_put;
+	ret = -ENOENT;
+	if (test_bit(CACHE_NEGATIVE, &(*item)->h.flags))
+		goto out_put;
+	return 0;
+out_put:
+	ent_put(&(*item)->h, detail);
+out_err:
+	*item = NULL;
+	return ret;
+}
+
+static int
+idmap_lookup(struct svc_rqst *rqstp,
+		struct ent *(*lookup_fn)(struct ent *, int), struct ent *key,
+		struct cache_detail *detail, struct ent **item)
+{
+	struct idmap_defer_req *mdr;
+	int ret;
+
+	mdr = kmalloc(sizeof(*mdr), GFP_KERNEL);
+	if (!mdr)
+		return -ENOMEM;
+	memset(mdr, 0, sizeof(*mdr));
+	atomic_set(&mdr->count, 1);
+	init_waitqueue_head(&mdr->waitq);
+	mdr->req.defer = idmap_defer;
+	ret = do_idmap_lookup(lookup_fn, key, detail, item, mdr);
+	if (ret == -EAGAIN) {
+		wait_event_interruptible_timeout(mdr->waitq,
+			test_bit(CACHE_VALID, &(*item)->h.flags), 1 * HZ);
+		ret = do_idmap_lookup_nowait(lookup_fn, key, detail, item);
+	}
+	put_mdr(mdr);
+	return ret;
+}
+
+static int
+idmap_name_to_id(struct svc_rqst *rqstp, int type, const char *name, u32 namelen,
+		uid_t *id)
+{
+	struct ent *item, key = {
+		.type = type,
+	};
+	int ret;
+
+	if (namelen + 1 > sizeof(key.name))
+		return -EINVAL;
+	memcpy(key.name, name, namelen);
+	key.name[namelen] = '\0';
+	strlcpy(key.authname, rqstp->rq_client->name, sizeof(key.authname));
+	ret = idmap_lookup(rqstp, nametoid_lookup, &key, &nametoid_cache, &item);
+	if (ret == -ENOENT)
+		ret = -ESRCH; /* nfserr_badname */
+	if (ret)
+		return ret;
+	*id = item->id;
+	ent_put(&item->h, &nametoid_cache);
+	return 0;
+}
+
+static int
+idmap_id_to_name(struct svc_rqst *rqstp, int type, uid_t id, char *name)
+{
+	struct ent *item, key = {
+		.id = id,
+		.type = type,
+	};
+	int ret;
+
+	strlcpy(key.authname, rqstp->rq_client->name, sizeof(key.authname));
+	ret = idmap_lookup(rqstp, idtoname_lookup, &key, &idtoname_cache, &item);
+	if (ret == -ENOENT)
+		return sprintf(name, "%u", id);
+	if (ret)
+		return ret;
+	ret = strlen(item->name);
+	BUG_ON(ret > IDMAP_NAMESZ);
+	memcpy(name, item->name, ret);
+	ent_put(&item->h, &idtoname_cache);
+	return ret;
+}
+
+int
+nfsd_map_name_to_uid(struct svc_rqst *rqstp, const char *name, size_t namelen,
+		__u32 *id)
+{
+	return idmap_name_to_id(rqstp, IDMAP_TYPE_USER, name, namelen, id);
+}
+
+int
+nfsd_map_name_to_gid(struct svc_rqst *rqstp, const char *name, size_t namelen,
+		__u32 *id)
+{
+	return idmap_name_to_id(rqstp, IDMAP_TYPE_GROUP, name, namelen, id);
+}
+
+int
+nfsd_map_uid_to_name(struct svc_rqst *rqstp, __u32 id, char *name)
+{
+	return idmap_id_to_name(rqstp, IDMAP_TYPE_USER, id, name);
+}
+
+int
+nfsd_map_gid_to_name(struct svc_rqst *rqstp, __u32 id, char *name)
+{
+	return idmap_id_to_name(rqstp, IDMAP_TYPE_GROUP, id, name);
+}