#include <linux/module.h>
#include <linux/slab.h>
+#include <linux/key.h>
+#include <linux/ctype.h>
+#include <linux/sched.h>
+#include <keys/rxrpc-type.h>
#include "internal.h"
DECLARE_RWSEM(afs_proc_cells_sem);
LIST_HEAD(afs_proc_cells);
-static struct list_head afs_cells = LIST_HEAD_INIT(afs_cells);
+static LIST_HEAD(afs_cells);
static DEFINE_RWLOCK(afs_cells_lock);
static DECLARE_RWSEM(afs_cells_sem); /* add/remove serialisation */
static DECLARE_WAIT_QUEUE_HEAD(afs_cells_freeable_wq);
static struct afs_cell *afs_cell_root;
/*
- * create a cell record
- * - "name" is the name of the cell
- * - "vllist" is a colon separated list of IP addresses in "a.b.c.d" format
+ * allocate a cell record and fill in its name, VL server address list and
+ * allocate an anonymous key
*/
-struct afs_cell *afs_cell_create(const char *name, char *vllist)
+static struct afs_cell *afs_cell_alloc(const char *name, char *vllist)
{
struct afs_cell *cell;
- char *next;
+ struct key *key;
+ size_t namelen;
+ char keyname[4 + AFS_MAXCELLNAME + 1], *cp, *dp, *next;
int ret;
_enter("%s,%s", name, vllist);
BUG_ON(!name); /* TODO: want to look up "this cell" in the cache */
+ namelen = strlen(name);
+ if (namelen > AFS_MAXCELLNAME)
+ return ERR_PTR(-ENAMETOOLONG);
+
/* allocate and initialise a cell record */
- cell = kmalloc(sizeof(struct afs_cell) + strlen(name) + 1, GFP_KERNEL);
+ cell = kzalloc(sizeof(struct afs_cell) + namelen + 1, GFP_KERNEL);
if (!cell) {
_leave(" = -ENOMEM");
return ERR_PTR(-ENOMEM);
}
- down_write(&afs_cells_sem);
+ memcpy(cell->name, name, namelen);
+ cell->name[namelen] = 0;
- memset(cell, 0, sizeof(struct afs_cell));
atomic_set(&cell->usage, 1);
-
INIT_LIST_HEAD(&cell->link);
-
rwlock_init(&cell->servers_lock);
INIT_LIST_HEAD(&cell->servers);
-
init_rwsem(&cell->vl_sem);
INIT_LIST_HEAD(&cell->vl_list);
spin_lock_init(&cell->vl_lock);
- strcpy(cell->name, name);
-
/* fill in the VL server list from the rest of the string */
- ret = -EINVAL;
do {
unsigned a, b, c, d;
*next++ = 0;
if (sscanf(vllist, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
- goto badaddr;
+ goto bad_address;
if (a > 255 || b > 255 || c > 255 || d > 255)
- goto badaddr;
+ goto bad_address;
cell->vl_addrs[cell->vl_naddrs++].s_addr =
htonl((a << 24) | (b << 16) | (c << 8) | d);
- if (cell->vl_naddrs >= AFS_CELL_MAX_ADDRS)
- break;
+ } while (cell->vl_naddrs < AFS_CELL_MAX_ADDRS && (vllist = next));
+
+ /* create a key to represent an anonymous user */
+ memcpy(keyname, "afs@", 4);
+ dp = keyname + 4;
+ cp = cell->name;
+ do {
+ *dp++ = toupper(*cp);
+ } while (*cp++);
+
+ key = rxrpc_get_null_key(keyname);
+ if (IS_ERR(key)) {
+ _debug("no key");
+ ret = PTR_ERR(key);
+ goto error;
+ }
+ cell->anonymous_key = key;
+
+ _debug("anon key %p{%x}",
+ cell->anonymous_key, key_serial(cell->anonymous_key));
+
+ _leave(" = %p", cell);
+ return cell;
+
+bad_address:
+ printk(KERN_ERR "kAFS: bad VL server IP address\n");
+ ret = -EINVAL;
+error:
+ key_put(cell->anonymous_key);
+ kfree(cell);
+ _leave(" = %d", ret);
+ return ERR_PTR(ret);
+}
+
+/*
+ * create a cell record
+ * - "name" is the name of the cell
+ * - "vllist" is a colon separated list of IP addresses in "a.b.c.d" format
+ */
+struct afs_cell *afs_cell_create(const char *name, char *vllist)
+{
+ struct afs_cell *cell;
+ int ret;
- } while ((vllist = next));
+ _enter("%s,%s", name, vllist);
+
+ down_write(&afs_cells_sem);
+ read_lock(&afs_cells_lock);
+ list_for_each_entry(cell, &afs_cells, link) {
+ if (strcasecmp(cell->name, name) == 0)
+ goto duplicate_name;
+ }
+ read_unlock(&afs_cells_lock);
+
+ cell = afs_cell_alloc(name, vllist);
+ if (IS_ERR(cell)) {
+ _leave(" = %ld", PTR_ERR(cell));
+ up_write(&afs_cells_sem);
+ return cell;
+ }
/* add a proc directory for this cell */
ret = afs_proc_cell_setup(cell);
_leave(" = %p", cell);
return cell;
-badaddr:
- printk(KERN_ERR "kAFS: bad VL server IP address\n");
error:
up_write(&afs_cells_sem);
+ key_put(cell->anonymous_key);
kfree(cell);
_leave(" = %d", ret);
return ERR_PTR(ret);
+
+duplicate_name:
+ read_unlock(&afs_cells_lock);
+ up_write(&afs_cells_sem);
+ return ERR_PTR(-EEXIST);
}
/*
return cell;
}
+#if 0
/*
* try and get a cell record
*/
write_unlock(&afs_cells_lock);
return cell;
}
+#endif /* 0 */
/*
* destroy a cell record
cachefs_relinquish_cookie(cell->cache, 0);
#endif
+ key_put(cell->anonymous_key);
kfree(cell);
_leave(" [destroyed]");