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![David Howells](/assets/img/avatar_default.png)
When an AFS inode is allocated by afs_alloc_inode(), the allocated afs_vnode struct isn't necessarily reset from the last time it was used as an inode because the slab constructor is only invoked once when the memory is obtained from the page allocator. This means that information can leak from one inode to the next because we're not calling kmem_cache_zalloc(). Some of the information isn't reset, in particular the permit cache pointer. Bring the clearances up to date. Signed-off-by: David Howells <dhowells@redhat.com> Tested-by: Marc Dionne <marc.dionne@auristor.com>
660 lines
15 KiB
C
660 lines
15 KiB
C
/* AFS superblock handling
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*
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* Copyright (c) 2002, 2007 Red Hat, Inc. All rights reserved.
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*
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* This software may be freely redistributed under the terms of the
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* GNU General Public License.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Authors: David Howells <dhowells@redhat.com>
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* David Woodhouse <dwmw2@infradead.org>
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*
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/mount.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/fs.h>
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#include <linux/pagemap.h>
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#include <linux/parser.h>
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#include <linux/statfs.h>
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#include <linux/sched.h>
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#include <linux/nsproxy.h>
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#include <linux/magic.h>
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#include <net/net_namespace.h>
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#include "internal.h"
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static void afs_i_init_once(void *foo);
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static struct dentry *afs_mount(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *data);
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static void afs_kill_super(struct super_block *sb);
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static struct inode *afs_alloc_inode(struct super_block *sb);
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static void afs_destroy_inode(struct inode *inode);
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static int afs_statfs(struct dentry *dentry, struct kstatfs *buf);
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static int afs_show_devname(struct seq_file *m, struct dentry *root);
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static int afs_show_options(struct seq_file *m, struct dentry *root);
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struct file_system_type afs_fs_type = {
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.owner = THIS_MODULE,
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.name = "afs",
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.mount = afs_mount,
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.kill_sb = afs_kill_super,
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.fs_flags = 0,
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};
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MODULE_ALIAS_FS("afs");
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static const struct super_operations afs_super_ops = {
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.statfs = afs_statfs,
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.alloc_inode = afs_alloc_inode,
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.drop_inode = afs_drop_inode,
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.destroy_inode = afs_destroy_inode,
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.evict_inode = afs_evict_inode,
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.show_devname = afs_show_devname,
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.show_options = afs_show_options,
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};
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static struct kmem_cache *afs_inode_cachep;
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static atomic_t afs_count_active_inodes;
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enum {
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afs_no_opt,
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afs_opt_cell,
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afs_opt_rwpath,
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afs_opt_vol,
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afs_opt_autocell,
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};
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static const match_table_t afs_options_list = {
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{ afs_opt_cell, "cell=%s" },
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{ afs_opt_rwpath, "rwpath" },
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{ afs_opt_vol, "vol=%s" },
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{ afs_opt_autocell, "autocell" },
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{ afs_no_opt, NULL },
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};
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/*
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* initialise the filesystem
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*/
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int __init afs_fs_init(void)
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{
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int ret;
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_enter("");
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/* create ourselves an inode cache */
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atomic_set(&afs_count_active_inodes, 0);
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ret = -ENOMEM;
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afs_inode_cachep = kmem_cache_create("afs_inode_cache",
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sizeof(struct afs_vnode),
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0,
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SLAB_HWCACHE_ALIGN|SLAB_ACCOUNT,
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afs_i_init_once);
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if (!afs_inode_cachep) {
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printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
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return ret;
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}
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/* now export our filesystem to lesser mortals */
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ret = register_filesystem(&afs_fs_type);
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if (ret < 0) {
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kmem_cache_destroy(afs_inode_cachep);
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_leave(" = %d", ret);
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return ret;
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}
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_leave(" = 0");
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return 0;
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}
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/*
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* clean up the filesystem
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*/
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void __exit afs_fs_exit(void)
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{
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_enter("");
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afs_mntpt_kill_timer();
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unregister_filesystem(&afs_fs_type);
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if (atomic_read(&afs_count_active_inodes) != 0) {
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printk("kAFS: %d active inode objects still present\n",
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atomic_read(&afs_count_active_inodes));
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BUG();
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}
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/*
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* Make sure all delayed rcu free inodes are flushed before we
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* destroy cache.
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*/
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rcu_barrier();
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kmem_cache_destroy(afs_inode_cachep);
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_leave("");
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}
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/*
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* Display the mount device name in /proc/mounts.
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*/
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static int afs_show_devname(struct seq_file *m, struct dentry *root)
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{
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struct afs_super_info *as = AFS_FS_S(root->d_sb);
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struct afs_volume *volume = as->volume;
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struct afs_cell *cell = as->cell;
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const char *suf = "";
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char pref = '%';
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switch (volume->type) {
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case AFSVL_RWVOL:
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break;
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case AFSVL_ROVOL:
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pref = '#';
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if (volume->type_force)
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suf = ".readonly";
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break;
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case AFSVL_BACKVOL:
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pref = '#';
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suf = ".backup";
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break;
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}
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seq_printf(m, "%c%s:%s%s", pref, cell->name, volume->name, suf);
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return 0;
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}
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/*
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* Display the mount options in /proc/mounts.
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*/
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static int afs_show_options(struct seq_file *m, struct dentry *root)
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{
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if (test_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(d_inode(root))->flags))
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seq_puts(m, "autocell");
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return 0;
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}
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/*
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* parse the mount options
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* - this function has been shamelessly adapted from the ext3 fs which
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* shamelessly adapted it from the msdos fs
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*/
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static int afs_parse_options(struct afs_mount_params *params,
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char *options, const char **devname)
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{
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struct afs_cell *cell;
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substring_t args[MAX_OPT_ARGS];
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char *p;
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int token;
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_enter("%s", options);
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options[PAGE_SIZE - 1] = 0;
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while ((p = strsep(&options, ","))) {
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if (!*p)
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continue;
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token = match_token(p, afs_options_list, args);
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switch (token) {
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case afs_opt_cell:
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rcu_read_lock();
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cell = afs_lookup_cell_rcu(params->net,
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args[0].from,
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args[0].to - args[0].from);
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rcu_read_unlock();
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if (IS_ERR(cell))
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return PTR_ERR(cell);
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afs_put_cell(params->net, params->cell);
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params->cell = cell;
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break;
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case afs_opt_rwpath:
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params->rwpath = 1;
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break;
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case afs_opt_vol:
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*devname = args[0].from;
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break;
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case afs_opt_autocell:
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params->autocell = 1;
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break;
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default:
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printk(KERN_ERR "kAFS:"
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" Unknown or invalid mount option: '%s'\n", p);
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return -EINVAL;
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}
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}
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_leave(" = 0");
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return 0;
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}
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/*
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* parse a device name to get cell name, volume name, volume type and R/W
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* selector
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* - this can be one of the following:
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* "%[cell:]volume[.]" R/W volume
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* "#[cell:]volume[.]" R/O or R/W volume (rwpath=0),
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* or R/W (rwpath=1) volume
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* "%[cell:]volume.readonly" R/O volume
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* "#[cell:]volume.readonly" R/O volume
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* "%[cell:]volume.backup" Backup volume
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* "#[cell:]volume.backup" Backup volume
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*/
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static int afs_parse_device_name(struct afs_mount_params *params,
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const char *name)
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{
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struct afs_cell *cell;
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const char *cellname, *suffix;
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int cellnamesz;
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_enter(",%s", name);
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if (!name) {
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printk(KERN_ERR "kAFS: no volume name specified\n");
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return -EINVAL;
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}
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if ((name[0] != '%' && name[0] != '#') || !name[1]) {
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printk(KERN_ERR "kAFS: unparsable volume name\n");
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return -EINVAL;
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}
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/* determine the type of volume we're looking for */
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params->type = AFSVL_ROVOL;
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params->force = false;
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if (params->rwpath || name[0] == '%') {
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params->type = AFSVL_RWVOL;
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params->force = true;
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}
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name++;
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/* split the cell name out if there is one */
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params->volname = strchr(name, ':');
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if (params->volname) {
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cellname = name;
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cellnamesz = params->volname - name;
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params->volname++;
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} else {
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params->volname = name;
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cellname = NULL;
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cellnamesz = 0;
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}
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/* the volume type is further affected by a possible suffix */
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suffix = strrchr(params->volname, '.');
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if (suffix) {
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if (strcmp(suffix, ".readonly") == 0) {
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params->type = AFSVL_ROVOL;
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params->force = true;
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} else if (strcmp(suffix, ".backup") == 0) {
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params->type = AFSVL_BACKVOL;
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params->force = true;
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} else if (suffix[1] == 0) {
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} else {
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suffix = NULL;
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}
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}
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params->volnamesz = suffix ?
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suffix - params->volname : strlen(params->volname);
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_debug("cell %*.*s [%p]",
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cellnamesz, cellnamesz, cellname ?: "", params->cell);
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/* lookup the cell record */
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if (cellname || !params->cell) {
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cell = afs_lookup_cell(params->net, cellname, cellnamesz,
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NULL, false);
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if (IS_ERR(cell)) {
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printk(KERN_ERR "kAFS: unable to lookup cell '%*.*s'\n",
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cellnamesz, cellnamesz, cellname ?: "");
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return PTR_ERR(cell);
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}
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afs_put_cell(params->net, params->cell);
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params->cell = cell;
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}
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_debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s",
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params->cell->name, params->cell,
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params->volnamesz, params->volnamesz, params->volname,
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suffix ?: "-", params->type, params->force ? " FORCE" : "");
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return 0;
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}
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/*
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* check a superblock to see if it's the one we're looking for
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*/
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static int afs_test_super(struct super_block *sb, void *data)
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{
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struct afs_super_info *as1 = data;
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struct afs_super_info *as = AFS_FS_S(sb);
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return as->net == as1->net && as->volume->vid == as1->volume->vid;
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}
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static int afs_set_super(struct super_block *sb, void *data)
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{
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struct afs_super_info *as = data;
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sb->s_fs_info = as;
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return set_anon_super(sb, NULL);
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}
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/*
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* fill in the superblock
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*/
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static int afs_fill_super(struct super_block *sb,
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struct afs_mount_params *params)
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{
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struct afs_super_info *as = AFS_FS_S(sb);
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struct afs_fid fid;
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struct inode *inode = NULL;
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int ret;
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_enter("");
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/* fill in the superblock */
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sb->s_blocksize = PAGE_SIZE;
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sb->s_blocksize_bits = PAGE_SHIFT;
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sb->s_magic = AFS_FS_MAGIC;
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sb->s_op = &afs_super_ops;
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sb->s_xattr = afs_xattr_handlers;
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ret = super_setup_bdi(sb);
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if (ret)
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return ret;
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sb->s_bdi->ra_pages = VM_MAX_READAHEAD * 1024 / PAGE_SIZE;
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sprintf(sb->s_id, "%u", as->volume->vid);
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afs_activate_volume(as->volume);
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/* allocate the root inode and dentry */
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fid.vid = as->volume->vid;
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fid.vnode = 1;
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fid.unique = 1;
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inode = afs_iget(sb, params->key, &fid, NULL, NULL, NULL);
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if (IS_ERR(inode))
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return PTR_ERR(inode);
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if (params->autocell)
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set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags);
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ret = -ENOMEM;
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sb->s_root = d_make_root(inode);
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if (!sb->s_root)
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goto error;
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sb->s_d_op = &afs_fs_dentry_operations;
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_leave(" = 0");
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return 0;
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error:
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_leave(" = %d", ret);
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return ret;
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}
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static struct afs_super_info *afs_alloc_sbi(struct afs_mount_params *params)
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{
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struct afs_super_info *as;
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as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL);
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if (as) {
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as->net = afs_get_net(params->net);
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as->cell = afs_get_cell(params->cell);
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}
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return as;
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}
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static void afs_destroy_sbi(struct afs_super_info *as)
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{
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if (as) {
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afs_put_volume(as->cell, as->volume);
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afs_put_cell(as->net, as->cell);
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afs_put_net(as->net);
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kfree(as);
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}
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}
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/*
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* get an AFS superblock
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*/
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static struct dentry *afs_mount(struct file_system_type *fs_type,
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int flags, const char *dev_name, void *options)
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{
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struct afs_mount_params params;
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struct super_block *sb;
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struct afs_volume *candidate;
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struct key *key;
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struct afs_super_info *as;
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int ret;
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_enter(",,%s,%p", dev_name, options);
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memset(¶ms, 0, sizeof(params));
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params.net = &__afs_net;
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ret = -EINVAL;
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if (current->nsproxy->net_ns != &init_net)
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goto error;
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/* parse the options and device name */
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if (options) {
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ret = afs_parse_options(¶ms, options, &dev_name);
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if (ret < 0)
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goto error;
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}
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ret = afs_parse_device_name(¶ms, dev_name);
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if (ret < 0)
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goto error;
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/* try and do the mount securely */
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key = afs_request_key(params.cell);
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if (IS_ERR(key)) {
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_leave(" = %ld [key]", PTR_ERR(key));
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ret = PTR_ERR(key);
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goto error;
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}
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params.key = key;
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/* allocate a superblock info record */
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ret = -ENOMEM;
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as = afs_alloc_sbi(¶ms);
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if (!as)
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goto error_key;
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/* Assume we're going to need a volume record; at the very least we can
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* use it to update the volume record if we have one already. This
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* checks that the volume exists within the cell.
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*/
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candidate = afs_create_volume(¶ms);
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if (IS_ERR(candidate)) {
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ret = PTR_ERR(candidate);
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goto error_as;
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}
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as->volume = candidate;
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/* allocate a deviceless superblock */
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sb = sget(fs_type, afs_test_super, afs_set_super, flags, as);
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if (IS_ERR(sb)) {
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ret = PTR_ERR(sb);
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goto error_as;
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}
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if (!sb->s_root) {
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/* initial superblock/root creation */
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_debug("create");
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ret = afs_fill_super(sb, ¶ms);
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if (ret < 0)
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goto error_sb;
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as = NULL;
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sb->s_flags |= SB_ACTIVE;
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} else {
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_debug("reuse");
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ASSERTCMP(sb->s_flags, &, SB_ACTIVE);
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afs_destroy_sbi(as);
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as = NULL;
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}
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afs_put_cell(params.net, params.cell);
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key_put(params.key);
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_leave(" = 0 [%p]", sb);
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return dget(sb->s_root);
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error_sb:
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deactivate_locked_super(sb);
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goto error_key;
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error_as:
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afs_destroy_sbi(as);
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error_key:
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key_put(params.key);
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error:
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afs_put_cell(params.net, params.cell);
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_leave(" = %d", ret);
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return ERR_PTR(ret);
|
|
}
|
|
|
|
static void afs_kill_super(struct super_block *sb)
|
|
{
|
|
struct afs_super_info *as = AFS_FS_S(sb);
|
|
|
|
/* Clear the callback interests (which will do ilookup5) before
|
|
* deactivating the superblock.
|
|
*/
|
|
afs_clear_callback_interests(as->net, as->volume->servers);
|
|
kill_anon_super(sb);
|
|
afs_deactivate_volume(as->volume);
|
|
afs_destroy_sbi(as);
|
|
}
|
|
|
|
/*
|
|
* Initialise an inode cache slab element prior to any use. Note that
|
|
* afs_alloc_inode() *must* reset anything that could incorrectly leak from one
|
|
* inode to another.
|
|
*/
|
|
static void afs_i_init_once(void *_vnode)
|
|
{
|
|
struct afs_vnode *vnode = _vnode;
|
|
|
|
memset(vnode, 0, sizeof(*vnode));
|
|
inode_init_once(&vnode->vfs_inode);
|
|
mutex_init(&vnode->io_lock);
|
|
mutex_init(&vnode->validate_lock);
|
|
spin_lock_init(&vnode->wb_lock);
|
|
spin_lock_init(&vnode->lock);
|
|
INIT_LIST_HEAD(&vnode->wb_keys);
|
|
INIT_LIST_HEAD(&vnode->pending_locks);
|
|
INIT_LIST_HEAD(&vnode->granted_locks);
|
|
INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work);
|
|
seqlock_init(&vnode->cb_lock);
|
|
}
|
|
|
|
/*
|
|
* allocate an AFS inode struct from our slab cache
|
|
*/
|
|
static struct inode *afs_alloc_inode(struct super_block *sb)
|
|
{
|
|
struct afs_vnode *vnode;
|
|
|
|
vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL);
|
|
if (!vnode)
|
|
return NULL;
|
|
|
|
atomic_inc(&afs_count_active_inodes);
|
|
|
|
/* Reset anything that shouldn't leak from one inode to the next. */
|
|
memset(&vnode->fid, 0, sizeof(vnode->fid));
|
|
memset(&vnode->status, 0, sizeof(vnode->status));
|
|
|
|
vnode->volume = NULL;
|
|
vnode->lock_key = NULL;
|
|
vnode->permit_cache = NULL;
|
|
vnode->cb_interest = NULL;
|
|
#ifdef CONFIG_AFS_FSCACHE
|
|
vnode->cache = NULL;
|
|
#endif
|
|
|
|
vnode->flags = 1 << AFS_VNODE_UNSET;
|
|
vnode->cb_type = 0;
|
|
vnode->lock_state = AFS_VNODE_LOCK_NONE;
|
|
|
|
_leave(" = %p", &vnode->vfs_inode);
|
|
return &vnode->vfs_inode;
|
|
}
|
|
|
|
static void afs_i_callback(struct rcu_head *head)
|
|
{
|
|
struct inode *inode = container_of(head, struct inode, i_rcu);
|
|
struct afs_vnode *vnode = AFS_FS_I(inode);
|
|
kmem_cache_free(afs_inode_cachep, vnode);
|
|
}
|
|
|
|
/*
|
|
* destroy an AFS inode struct
|
|
*/
|
|
static void afs_destroy_inode(struct inode *inode)
|
|
{
|
|
struct afs_vnode *vnode = AFS_FS_I(inode);
|
|
|
|
_enter("%p{%x:%u}", inode, vnode->fid.vid, vnode->fid.vnode);
|
|
|
|
_debug("DESTROY INODE %p", inode);
|
|
|
|
ASSERTCMP(vnode->cb_interest, ==, NULL);
|
|
|
|
call_rcu(&inode->i_rcu, afs_i_callback);
|
|
atomic_dec(&afs_count_active_inodes);
|
|
}
|
|
|
|
/*
|
|
* return information about an AFS volume
|
|
*/
|
|
static int afs_statfs(struct dentry *dentry, struct kstatfs *buf)
|
|
{
|
|
struct afs_fs_cursor fc;
|
|
struct afs_volume_status vs;
|
|
struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
|
|
struct key *key;
|
|
int ret;
|
|
|
|
key = afs_request_key(vnode->volume->cell);
|
|
if (IS_ERR(key))
|
|
return PTR_ERR(key);
|
|
|
|
ret = -ERESTARTSYS;
|
|
if (afs_begin_vnode_operation(&fc, vnode, key)) {
|
|
fc.flags |= AFS_FS_CURSOR_NO_VSLEEP;
|
|
while (afs_select_fileserver(&fc)) {
|
|
fc.cb_break = vnode->cb_break + vnode->cb_s_break;
|
|
afs_fs_get_volume_status(&fc, &vs);
|
|
}
|
|
|
|
afs_check_for_remote_deletion(&fc, fc.vnode);
|
|
afs_vnode_commit_status(&fc, vnode, fc.cb_break);
|
|
ret = afs_end_vnode_operation(&fc);
|
|
}
|
|
|
|
key_put(key);
|
|
|
|
if (ret == 0) {
|
|
buf->f_type = dentry->d_sb->s_magic;
|
|
buf->f_bsize = AFS_BLOCK_SIZE;
|
|
buf->f_namelen = AFSNAMEMAX - 1;
|
|
|
|
if (vs.max_quota == 0)
|
|
buf->f_blocks = vs.part_max_blocks;
|
|
else
|
|
buf->f_blocks = vs.max_quota;
|
|
buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use;
|
|
}
|
|
|
|
return ret;
|
|
}
|