mirror of https://gitee.com/openkylin/linux.git
712 lines
16 KiB
C
712 lines
16 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_dyn,
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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_dyn, "dyn" },
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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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if (as->dyn_root) {
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seq_puts(m, "none");
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return 0;
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}
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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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struct afs_super_info *as = AFS_FS_S(root->d_sb);
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if (as->dyn_root)
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seq_puts(m, ",dyn");
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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 = true;
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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 = true;
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break;
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case afs_opt_dyn:
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params->dyn_root = true;
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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 &&
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as->volume &&
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as->volume->vid == as1->volume->vid);
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}
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static int afs_dynroot_test_super(struct super_block *sb, void *data)
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{
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return false;
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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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if (!as->dyn_root)
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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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/* allocate the root inode and dentry */
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if (as->dyn_root) {
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inode = afs_iget_pseudo_dir(sb, true);
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sb->s_flags |= SB_RDONLY;
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} else {
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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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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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}
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if (IS_ERR(inode))
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return PTR_ERR(inode);
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if (params->autocell || params->dyn_root)
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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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if (params->dyn_root)
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sb->s_d_op = &afs_dynroot_dentry_operations;
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else
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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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if (params->dyn_root)
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as->dyn_root = true;
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else
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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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if (!params.dyn_root) {
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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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}
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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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if (!params.dyn_root) {
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/* Assume we're going to need a volume record; at the very
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* least we can use it to update the volume record if we have
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* one already. This checks that the volume exists within the
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* 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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}
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/* allocate a deviceless superblock */
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sb = sget(fs_type,
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as->dyn_root ? afs_dynroot_test_super : afs_test_super,
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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);
|
|
if (ret < 0)
|
|
goto error_sb;
|
|
as = NULL;
|
|
sb->s_flags |= SB_ACTIVE;
|
|
} else {
|
|
_debug("reuse");
|
|
ASSERTCMP(sb->s_flags, &, SB_ACTIVE);
|
|
afs_destroy_sbi(as);
|
|
as = NULL;
|
|
}
|
|
|
|
afs_put_cell(params.net, params.cell);
|
|
key_put(params.key);
|
|
_leave(" = 0 [%p]", sb);
|
|
return dget(sb->s_root);
|
|
|
|
error_sb:
|
|
deactivate_locked_super(sb);
|
|
goto error_key;
|
|
error_as:
|
|
afs_destroy_sbi(as);
|
|
error_key:
|
|
key_put(params.key);
|
|
error:
|
|
afs_put_cell(params.net, params.cell);
|
|
_leave(" = %d", ret);
|
|
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.
|
|
*/
|
|
if (as->volume)
|
|
afs_clear_callback_interests(as->net, as->volume->servers);
|
|
kill_anon_super(sb);
|
|
if (as->volume)
|
|
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_super_info *as = AFS_FS_S(dentry->d_sb);
|
|
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;
|
|
|
|
buf->f_type = dentry->d_sb->s_magic;
|
|
buf->f_bsize = AFS_BLOCK_SIZE;
|
|
buf->f_namelen = AFSNAMEMAX - 1;
|
|
|
|
if (as->dyn_root) {
|
|
buf->f_blocks = 1;
|
|
buf->f_bavail = 0;
|
|
buf->f_bfree = 0;
|
|
return 0;
|
|
}
|
|
|
|
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) {
|
|
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;
|
|
}
|