2007-04-26 22:49:28 +00:00
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/* AFS cell and server record management
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2005-04-16 22:20:36 +00:00
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*
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* Copyright (C) 2002 Red Hat, Inc. All Rights Reserved.
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* Written by David Howells (dhowells@redhat.com)
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version
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* 2 of the License, or (at your option) any later version.
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*/
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#include <linux/module.h>
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#include <linux/slab.h>
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2007-04-26 22:57:07 +00:00
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#include <linux/key.h>
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#include <linux/ctype.h>
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Detach sched.h from mm.h
First thing mm.h does is including sched.h solely for can_do_mlock() inline
function which has "current" dereference inside. By dealing with can_do_mlock()
mm.h can be detached from sched.h which is good. See below, why.
This patch
a) removes unconditional inclusion of sched.h from mm.h
b) makes can_do_mlock() normal function in mm/mlock.c
c) exports can_do_mlock() to not break compilation
d) adds sched.h inclusions back to files that were getting it indirectly.
e) adds less bloated headers to some files (asm/signal.h, jiffies.h) that were
getting them indirectly
Net result is:
a) mm.h users would get less code to open, read, preprocess, parse, ... if
they don't need sched.h
b) sched.h stops being dependency for significant number of files:
on x86_64 allmodconfig touching sched.h results in recompile of 4083 files,
after patch it's only 3744 (-8.3%).
Cross-compile tested on
all arm defconfigs, all mips defconfigs, all powerpc defconfigs,
alpha alpha-up
arm
i386 i386-up i386-defconfig i386-allnoconfig
ia64 ia64-up
m68k
mips
parisc parisc-up
powerpc powerpc-up
s390 s390-up
sparc sparc-up
sparc64 sparc64-up
um-x86_64
x86_64 x86_64-up x86_64-defconfig x86_64-allnoconfig
as well as my two usual configs.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-05-20 21:22:52 +00:00
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#include <linux/sched.h>
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2007-04-26 22:57:07 +00:00
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#include <keys/rxrpc-type.h>
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2005-04-16 22:20:36 +00:00
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#include "internal.h"
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DECLARE_RWSEM(afs_proc_cells_sem);
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LIST_HEAD(afs_proc_cells);
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static struct list_head afs_cells = LIST_HEAD_INIT(afs_cells);
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static DEFINE_RWLOCK(afs_cells_lock);
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static DECLARE_RWSEM(afs_cells_sem); /* add/remove serialisation */
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2007-04-26 22:55:03 +00:00
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static DECLARE_WAIT_QUEUE_HEAD(afs_cells_freeable_wq);
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2005-04-16 22:20:36 +00:00
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static struct afs_cell *afs_cell_root;
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/*
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2007-04-26 22:57:07 +00:00
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* allocate a cell record and fill in its name, VL server address list and
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* allocate an anonymous key
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2005-04-16 22:20:36 +00:00
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*/
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2007-04-26 22:57:07 +00:00
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static struct afs_cell *afs_cell_alloc(const char *name, char *vllist)
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2005-04-16 22:20:36 +00:00
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{
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struct afs_cell *cell;
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2007-04-26 22:57:07 +00:00
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size_t namelen;
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char keyname[4 + AFS_MAXCELLNAME + 1], *cp, *dp, *next;
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2005-04-16 22:20:36 +00:00
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int ret;
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2007-04-26 22:55:03 +00:00
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_enter("%s,%s", name, vllist);
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2005-04-16 22:20:36 +00:00
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BUG_ON(!name); /* TODO: want to look up "this cell" in the cache */
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2007-04-26 22:57:07 +00:00
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namelen = strlen(name);
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if (namelen > AFS_MAXCELLNAME)
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return ERR_PTR(-ENAMETOOLONG);
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2005-04-16 22:20:36 +00:00
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/* allocate and initialise a cell record */
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2007-04-26 22:57:07 +00:00
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cell = kzalloc(sizeof(struct afs_cell) + namelen + 1, GFP_KERNEL);
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2005-04-16 22:20:36 +00:00
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if (!cell) {
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_leave(" = -ENOMEM");
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2007-04-26 22:55:03 +00:00
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return ERR_PTR(-ENOMEM);
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2005-04-16 22:20:36 +00:00
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}
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2007-04-26 22:57:07 +00:00
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memcpy(cell->name, name, namelen);
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cell->name[namelen] = 0;
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2005-04-16 22:20:36 +00:00
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2007-04-26 22:55:03 +00:00
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atomic_set(&cell->usage, 1);
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2005-04-16 22:20:36 +00:00
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INIT_LIST_HEAD(&cell->link);
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2007-04-26 22:55:03 +00:00
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rwlock_init(&cell->servers_lock);
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INIT_LIST_HEAD(&cell->servers);
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2005-04-16 22:20:36 +00:00
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init_rwsem(&cell->vl_sem);
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INIT_LIST_HEAD(&cell->vl_list);
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2007-04-26 22:55:03 +00:00
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spin_lock_init(&cell->vl_lock);
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2005-04-16 22:20:36 +00:00
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/* fill in the VL server list from the rest of the string */
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do {
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unsigned a, b, c, d;
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next = strchr(vllist, ':');
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if (next)
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*next++ = 0;
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if (sscanf(vllist, "%u.%u.%u.%u", &a, &b, &c, &d) != 4)
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2007-04-26 22:57:07 +00:00
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goto bad_address;
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2005-04-16 22:20:36 +00:00
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if (a > 255 || b > 255 || c > 255 || d > 255)
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2007-04-26 22:57:07 +00:00
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goto bad_address;
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2005-04-16 22:20:36 +00:00
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cell->vl_addrs[cell->vl_naddrs++].s_addr =
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htonl((a << 24) | (b << 16) | (c << 8) | d);
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2007-04-26 22:57:07 +00:00
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} while (cell->vl_naddrs < AFS_CELL_MAX_ADDRS && (vllist = next));
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/* create a key to represent an anonymous user */
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memcpy(keyname, "afs@", 4);
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dp = keyname + 4;
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cp = cell->name;
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do {
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*dp++ = toupper(*cp);
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} while (*cp++);
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cell->anonymous_key = key_alloc(&key_type_rxrpc, keyname, 0, 0, current,
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KEY_POS_SEARCH, KEY_ALLOC_NOT_IN_QUOTA);
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if (IS_ERR(cell->anonymous_key)) {
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_debug("no key");
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ret = PTR_ERR(cell->anonymous_key);
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goto error;
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}
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ret = key_instantiate_and_link(cell->anonymous_key, NULL, 0,
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NULL, NULL);
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if (ret < 0) {
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_debug("instantiate failed");
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goto error;
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}
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_debug("anon key %p{%x}",
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cell->anonymous_key, key_serial(cell->anonymous_key));
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_leave(" = %p", cell);
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return cell;
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bad_address:
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printk(KERN_ERR "kAFS: bad VL server IP address\n");
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ret = -EINVAL;
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error:
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key_put(cell->anonymous_key);
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kfree(cell);
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_leave(" = %d", ret);
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return ERR_PTR(ret);
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}
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2005-04-16 22:20:36 +00:00
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2007-04-26 22:57:07 +00:00
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/*
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* create a cell record
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* - "name" is the name of the cell
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* - "vllist" is a colon separated list of IP addresses in "a.b.c.d" format
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*/
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struct afs_cell *afs_cell_create(const char *name, char *vllist)
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{
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struct afs_cell *cell;
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int ret;
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_enter("%s,%s", name, vllist);
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cell = afs_cell_alloc(name, vllist);
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if (IS_ERR(cell)) {
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_leave(" = %ld", PTR_ERR(cell));
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return cell;
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}
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down_write(&afs_cells_sem);
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2005-04-16 22:20:36 +00:00
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2007-04-26 22:55:03 +00:00
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/* add a proc directory for this cell */
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2005-04-16 22:20:36 +00:00
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ret = afs_proc_cell_setup(cell);
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if (ret < 0)
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goto error;
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#ifdef AFS_CACHING_SUPPORT
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/* put it up for caching */
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cachefs_acquire_cookie(afs_cache_netfs.primary_index,
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&afs_vlocation_cache_index_def,
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cell,
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&cell->cache);
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#endif
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/* add to the cell lists */
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write_lock(&afs_cells_lock);
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list_add_tail(&cell->link, &afs_cells);
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write_unlock(&afs_cells_lock);
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down_write(&afs_proc_cells_sem);
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list_add_tail(&cell->proc_link, &afs_proc_cells);
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up_write(&afs_proc_cells_sem);
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up_write(&afs_cells_sem);
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2007-04-26 22:55:03 +00:00
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_leave(" = %p", cell);
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return cell;
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2005-04-16 22:20:36 +00:00
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2007-04-26 22:49:28 +00:00
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error:
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2005-04-16 22:20:36 +00:00
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up_write(&afs_cells_sem);
|
2007-04-26 22:57:07 +00:00
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key_put(cell->anonymous_key);
|
2005-04-16 22:20:36 +00:00
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kfree(cell);
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_leave(" = %d", ret);
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2007-04-26 22:55:03 +00:00
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return ERR_PTR(ret);
|
2007-04-26 22:49:28 +00:00
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}
|
2005-04-16 22:20:36 +00:00
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/*
|
2007-04-26 22:55:03 +00:00
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* set the root cell information
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* - can be called with a module parameter string
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* - can be called from a write to /proc/fs/afs/rootcell
|
2005-04-16 22:20:36 +00:00
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*/
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int afs_cell_init(char *rootcell)
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{
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struct afs_cell *old_root, *new_root;
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char *cp;
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_enter("");
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if (!rootcell) {
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/* module is loaded with no parameters, or built statically.
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* - in the future we might initialize cell DB here.
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*/
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2007-04-26 22:55:03 +00:00
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_leave(" = 0 [no root]");
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2005-04-16 22:20:36 +00:00
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return 0;
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}
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cp = strchr(rootcell, ':');
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if (!cp) {
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printk(KERN_ERR "kAFS: no VL server IP addresses specified\n");
|
2007-04-26 22:55:03 +00:00
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_leave(" = -EINVAL");
|
2005-04-16 22:20:36 +00:00
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return -EINVAL;
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}
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/* allocate a cell record for the root cell */
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*cp++ = 0;
|
2007-04-26 22:55:03 +00:00
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new_root = afs_cell_create(rootcell, cp);
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if (IS_ERR(new_root)) {
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_leave(" = %ld", PTR_ERR(new_root));
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return PTR_ERR(new_root);
|
2005-04-16 22:20:36 +00:00
|
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}
|
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2007-04-26 22:55:03 +00:00
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/* install the new cell */
|
2005-04-16 22:20:36 +00:00
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write_lock(&afs_cells_lock);
|
2007-04-26 22:55:03 +00:00
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old_root = afs_cell_root;
|
2005-04-16 22:20:36 +00:00
|
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afs_cell_root = new_root;
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write_unlock(&afs_cells_lock);
|
2007-04-26 22:55:03 +00:00
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afs_put_cell(old_root);
|
2005-04-16 22:20:36 +00:00
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2007-04-26 22:55:03 +00:00
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_leave(" = 0");
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return 0;
|
2007-04-26 22:49:28 +00:00
|
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}
|
2005-04-16 22:20:36 +00:00
|
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/*
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* lookup a cell record
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*/
|
2007-04-26 22:55:03 +00:00
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struct afs_cell *afs_cell_lookup(const char *name, unsigned namesz)
|
2005-04-16 22:20:36 +00:00
|
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{
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struct afs_cell *cell;
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_enter("\"%*.*s\",", namesz, namesz, name ? name : "");
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2007-04-26 22:55:03 +00:00
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down_read(&afs_cells_sem);
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read_lock(&afs_cells_lock);
|
2005-04-16 22:20:36 +00:00
|
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if (name) {
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|
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/* if the cell was named, look for it in the cell record list */
|
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list_for_each_entry(cell, &afs_cells, link) {
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if (strncmp(cell->name, name, namesz) == 0) {
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|
afs_get_cell(cell);
|
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goto found;
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|
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}
|
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|
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}
|
2007-04-26 22:55:03 +00:00
|
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|
cell = ERR_PTR(-ENOENT);
|
2005-04-16 22:20:36 +00:00
|
|
|
found:
|
2007-04-26 22:55:03 +00:00
|
|
|
;
|
2007-04-26 22:49:28 +00:00
|
|
|
} else {
|
2005-04-16 22:20:36 +00:00
|
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cell = afs_cell_root;
|
|
|
|
if (!cell) {
|
|
|
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/* this should not happen unless user tries to mount
|
|
|
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* when root cell is not set. Return an impossibly
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|
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* bizzare errno to alert the user. Things like
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|
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* ENOENT might be "more appropriate" but they happen
|
|
|
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* for other reasons.
|
|
|
|
*/
|
2007-04-26 22:55:03 +00:00
|
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|
cell = ERR_PTR(-EDESTADDRREQ);
|
2007-04-26 22:49:28 +00:00
|
|
|
} else {
|
2005-04-16 22:20:36 +00:00
|
|
|
afs_get_cell(cell);
|
|
|
|
}
|
|
|
|
|
|
|
|
}
|
|
|
|
|
2007-04-26 22:55:03 +00:00
|
|
|
read_unlock(&afs_cells_lock);
|
|
|
|
up_read(&afs_cells_sem);
|
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|
|
_leave(" = %p", cell);
|
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return cell;
|
2007-04-26 22:49:28 +00:00
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* try and get a cell record
|
|
|
|
*/
|
2007-04-26 22:55:03 +00:00
|
|
|
struct afs_cell *afs_get_cell_maybe(struct afs_cell *cell)
|
2005-04-16 22:20:36 +00:00
|
|
|
{
|
|
|
|
write_lock(&afs_cells_lock);
|
|
|
|
|
|
|
|
if (cell && !list_empty(&cell->link))
|
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|
|
afs_get_cell(cell);
|
|
|
|
else
|
|
|
|
cell = NULL;
|
|
|
|
|
|
|
|
write_unlock(&afs_cells_lock);
|
|
|
|
return cell;
|
2007-04-26 22:49:28 +00:00
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* destroy a cell record
|
|
|
|
*/
|
|
|
|
void afs_put_cell(struct afs_cell *cell)
|
|
|
|
{
|
|
|
|
if (!cell)
|
|
|
|
return;
|
|
|
|
|
|
|
|
_enter("%p{%d,%s}", cell, atomic_read(&cell->usage), cell->name);
|
|
|
|
|
2007-04-26 22:55:03 +00:00
|
|
|
ASSERTCMP(atomic_read(&cell->usage), >, 0);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/* to prevent a race, the decrement and the dequeue must be effectively
|
|
|
|
* atomic */
|
|
|
|
write_lock(&afs_cells_lock);
|
|
|
|
|
|
|
|
if (likely(!atomic_dec_and_test(&cell->usage))) {
|
|
|
|
write_unlock(&afs_cells_lock);
|
|
|
|
_leave("");
|
|
|
|
return;
|
|
|
|
}
|
|
|
|
|
2007-04-26 22:55:03 +00:00
|
|
|
ASSERT(list_empty(&cell->servers));
|
|
|
|
ASSERT(list_empty(&cell->vl_list));
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
write_unlock(&afs_cells_lock);
|
|
|
|
|
2007-04-26 22:55:03 +00:00
|
|
|
wake_up(&afs_cells_freeable_wq);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
_leave(" [unused]");
|
2007-04-26 22:49:28 +00:00
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* destroy a cell record
|
2007-04-26 22:55:03 +00:00
|
|
|
* - must be called with the afs_cells_sem write-locked
|
|
|
|
* - cell->link should have been broken by the caller
|
2005-04-16 22:20:36 +00:00
|
|
|
*/
|
|
|
|
static void afs_cell_destroy(struct afs_cell *cell)
|
|
|
|
{
|
|
|
|
_enter("%p{%d,%s}", cell, atomic_read(&cell->usage), cell->name);
|
|
|
|
|
2007-04-26 22:55:03 +00:00
|
|
|
ASSERTCMP(atomic_read(&cell->usage), >=, 0);
|
|
|
|
ASSERT(list_empty(&cell->link));
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2007-04-26 22:55:03 +00:00
|
|
|
/* wait for everyone to stop using the cell */
|
|
|
|
if (atomic_read(&cell->usage) > 0) {
|
|
|
|
DECLARE_WAITQUEUE(myself, current);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2007-04-26 22:55:03 +00:00
|
|
|
_debug("wait for cell %s", cell->name);
|
|
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
|
|
add_wait_queue(&afs_cells_freeable_wq, &myself);
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2007-04-26 22:55:03 +00:00
|
|
|
while (atomic_read(&cell->usage) > 0) {
|
|
|
|
schedule();
|
|
|
|
set_current_state(TASK_UNINTERRUPTIBLE);
|
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
|
2007-04-26 22:55:03 +00:00
|
|
|
remove_wait_queue(&afs_cells_freeable_wq, &myself);
|
|
|
|
set_current_state(TASK_RUNNING);
|
|
|
|
}
|
|
|
|
|
|
|
|
_debug("cell dead");
|
|
|
|
ASSERTCMP(atomic_read(&cell->usage), ==, 0);
|
|
|
|
ASSERT(list_empty(&cell->servers));
|
|
|
|
ASSERT(list_empty(&cell->vl_list));
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
afs_proc_cell_remove(cell);
|
|
|
|
|
|
|
|
down_write(&afs_proc_cells_sem);
|
|
|
|
list_del_init(&cell->proc_link);
|
|
|
|
up_write(&afs_proc_cells_sem);
|
|
|
|
|
|
|
|
#ifdef AFS_CACHING_SUPPORT
|
|
|
|
cachefs_relinquish_cookie(cell->cache, 0);
|
|
|
|
#endif
|
|
|
|
|
2007-04-26 22:57:07 +00:00
|
|
|
key_put(cell->anonymous_key);
|
2005-04-16 22:20:36 +00:00
|
|
|
kfree(cell);
|
|
|
|
|
|
|
|
_leave(" [destroyed]");
|
2007-04-26 22:49:28 +00:00
|
|
|
}
|
2005-04-16 22:20:36 +00:00
|
|
|
|
|
|
|
/*
|
|
|
|
* purge in-memory cell database on module unload or afs_init() failure
|
|
|
|
* - the timeout daemon is stopped before calling this
|
|
|
|
*/
|
|
|
|
void afs_cell_purge(void)
|
|
|
|
{
|
|
|
|
struct afs_cell *cell;
|
|
|
|
|
|
|
|
_enter("");
|
|
|
|
|
|
|
|
afs_put_cell(afs_cell_root);
|
|
|
|
|
2007-04-26 22:55:03 +00:00
|
|
|
down_write(&afs_cells_sem);
|
|
|
|
|
2005-04-16 22:20:36 +00:00
|
|
|
while (!list_empty(&afs_cells)) {
|
|
|
|
cell = NULL;
|
|
|
|
|
|
|
|
/* remove the next cell from the front of the list */
|
|
|
|
write_lock(&afs_cells_lock);
|
|
|
|
|
|
|
|
if (!list_empty(&afs_cells)) {
|
|
|
|
cell = list_entry(afs_cells.next,
|
|
|
|
struct afs_cell, link);
|
|
|
|
list_del_init(&cell->link);
|
|
|
|
}
|
|
|
|
|
|
|
|
write_unlock(&afs_cells_lock);
|
|
|
|
|
|
|
|
if (cell) {
|
|
|
|
_debug("PURGING CELL %s (%d)",
|
|
|
|
cell->name, atomic_read(&cell->usage));
|
|
|
|
|
|
|
|
/* now the cell should be left with no references */
|
|
|
|
afs_cell_destroy(cell);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2007-04-26 22:55:03 +00:00
|
|
|
up_write(&afs_cells_sem);
|
2005-04-16 22:20:36 +00:00
|
|
|
_leave("");
|
2007-04-26 22:49:28 +00:00
|
|
|
}
|