Linux-2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
This commit is contained in:
Linus Torvalds
441
fs/afs/super.c
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441
fs/afs/super.c
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@@ -0,0 +1,441 @@
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/*
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* Copyright (c) 2002 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@cambridge.redhat.com>
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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/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 "vnode.h"
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#include "volume.h"
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#include "cell.h"
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#include "cmservice.h"
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#include "fsclient.h"
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#include "super.h"
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#include "internal.h"
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#define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */
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struct afs_mount_params {
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int rwpath;
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struct afs_cell *default_cell;
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struct afs_volume *volume;
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};
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static void afs_i_init_once(void *foo, kmem_cache_t *cachep,
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unsigned long flags);
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static struct super_block *afs_get_sb(struct file_system_type *fs_type,
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int flags, const char *dev_name,
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void *data);
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static struct inode *afs_alloc_inode(struct super_block *sb);
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static void afs_put_super(struct super_block *sb);
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static void afs_destroy_inode(struct inode *inode);
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static struct file_system_type afs_fs_type = {
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.owner = THIS_MODULE,
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.name = "afs",
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.get_sb = afs_get_sb,
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.kill_sb = kill_anon_super,
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.fs_flags = FS_BINARY_MOUNTDATA,
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};
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static struct super_operations afs_super_ops = {
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.statfs = simple_statfs,
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.alloc_inode = afs_alloc_inode,
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.drop_inode = generic_delete_inode,
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.destroy_inode = afs_destroy_inode,
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.clear_inode = afs_clear_inode,
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.put_super = afs_put_super,
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};
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static kmem_cache_t *afs_inode_cachep;
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static atomic_t afs_count_active_inodes;
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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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afs_timer_init(&afs_mntpt_expiry_timer, &afs_mntpt_expiry_timer_ops);
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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,
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afs_i_init_once,
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NULL);
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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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kleave(" = %d", ret);
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return ret;
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}
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kleave(" = 0");
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return 0;
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} /* end afs_fs_init() */
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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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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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kmem_cache_destroy(afs_inode_cachep);
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} /* end afs_fs_exit() */
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/*****************************************************************************/
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/*
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* check that an argument has a value
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*/
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static int want_arg(char **_value, const char *option)
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{
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if (!_value || !*_value || !**_value) {
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printk(KERN_NOTICE "kAFS: %s: argument missing\n", option);
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return 0;
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}
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return 1;
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} /* end want_arg() */
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/*****************************************************************************/
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/*
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* check that there's no subsequent value
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*/
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static int want_no_value(char *const *_value, const char *option)
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{
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if (*_value && **_value) {
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printk(KERN_NOTICE "kAFS: %s: Invalid argument: %s\n",
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option, *_value);
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return 0;
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}
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return 1;
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} /* end want_no_value() */
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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_super_parse_options(struct afs_mount_params *params,
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char *options,
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const char **devname)
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{
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char *key, *value;
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int ret;
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_enter("%s", options);
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options[PAGE_SIZE - 1] = 0;
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ret = 0;
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while ((key = strsep(&options, ",")) != 0)
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{
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value = strchr(key, '=');
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if (value)
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*value++ = 0;
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printk("kAFS: KEY: %s, VAL:%s\n", key, value ?: "-");
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if (strcmp(key, "rwpath") == 0) {
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if (!want_no_value(&value, "rwpath"))
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return -EINVAL;
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params->rwpath = 1;
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continue;
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}
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else if (strcmp(key, "vol") == 0) {
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if (!want_arg(&value, "vol"))
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return -EINVAL;
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*devname = value;
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continue;
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}
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else if (strcmp(key, "cell") == 0) {
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if (!want_arg(&value, "cell"))
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return -EINVAL;
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afs_put_cell(params->default_cell);
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ret = afs_cell_lookup(value,
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strlen(value),
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¶ms->default_cell);
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if (ret < 0)
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return -EINVAL;
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continue;
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}
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printk("kAFS: Unknown mount option: '%s'\n", key);
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ret = -EINVAL;
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goto error;
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}
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ret = 0;
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error:
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_leave(" = %d", ret);
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return ret;
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} /* end afs_super_parse_options() */
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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_mount_params *params = data;
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struct afs_super_info *as = sb->s_fs_info;
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return as->volume == params->volume;
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} /* end afs_test_super() */
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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, void *data, int silent)
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{
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struct afs_mount_params *params = data;
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struct afs_super_info *as = NULL;
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struct afs_fid fid;
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struct dentry *root = NULL;
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struct inode *inode = NULL;
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int ret;
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kenter("");
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/* allocate a superblock info record */
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as = kmalloc(sizeof(struct afs_super_info), GFP_KERNEL);
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if (!as) {
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_leave(" = -ENOMEM");
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return -ENOMEM;
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}
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memset(as, 0, sizeof(struct afs_super_info));
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afs_get_volume(params->volume);
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as->volume = params->volume;
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/* fill in the superblock */
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sb->s_blocksize = PAGE_CACHE_SIZE;
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sb->s_blocksize_bits = PAGE_CACHE_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_fs_info = as;
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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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ret = afs_iget(sb, &fid, &inode);
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if (ret < 0)
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goto error;
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ret = -ENOMEM;
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root = d_alloc_root(inode);
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if (!root)
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goto error;
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sb->s_root = root;
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kleave(" = 0");
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return 0;
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error:
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iput(inode);
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afs_put_volume(as->volume);
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kfree(as);
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sb->s_fs_info = NULL;
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kleave(" = %d", ret);
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return ret;
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} /* end afs_fill_super() */
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/*****************************************************************************/
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/*
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* get an AFS superblock
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* - TODO: don't use get_sb_nodev(), but rather call sget() directly
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*/
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static struct super_block *afs_get_sb(struct file_system_type *fs_type,
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int flags,
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const char *dev_name,
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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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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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/* start the cache manager */
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ret = afscm_start();
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if (ret < 0) {
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_leave(" = %d", ret);
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return ERR_PTR(ret);
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}
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/* parse the options */
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if (options) {
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ret = afs_super_parse_options(¶ms, options, &dev_name);
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if (ret < 0)
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goto error;
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if (!dev_name) {
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printk("kAFS: no volume name specified\n");
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ret = -EINVAL;
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goto error;
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}
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}
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/* parse the device name */
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ret = afs_volume_lookup(dev_name,
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params.default_cell,
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params.rwpath,
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¶ms.volume);
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if (ret < 0)
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goto error;
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/* allocate a deviceless superblock */
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sb = sget(fs_type, afs_test_super, set_anon_super, ¶ms);
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if (IS_ERR(sb))
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goto error;
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sb->s_flags = flags;
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ret = afs_fill_super(sb, ¶ms, flags & MS_VERBOSE ? 1 : 0);
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if (ret < 0) {
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up_write(&sb->s_umount);
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deactivate_super(sb);
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goto error;
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}
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sb->s_flags |= MS_ACTIVE;
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afs_put_volume(params.volume);
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afs_put_cell(params.default_cell);
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_leave(" = %p", sb);
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return sb;
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error:
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afs_put_volume(params.volume);
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afs_put_cell(params.default_cell);
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afscm_stop();
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_leave(" = %d", ret);
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return ERR_PTR(ret);
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} /* end afs_get_sb() */
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/*****************************************************************************/
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/*
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* finish the unmounting process on the superblock
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*/
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static void afs_put_super(struct super_block *sb)
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{
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struct afs_super_info *as = sb->s_fs_info;
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_enter("");
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afs_put_volume(as->volume);
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afscm_stop();
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_leave("");
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} /* end afs_put_super() */
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/*****************************************************************************/
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/*
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* initialise an inode cache slab element prior to any use
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*/
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static void afs_i_init_once(void *_vnode, kmem_cache_t *cachep,
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unsigned long flags)
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{
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struct afs_vnode *vnode = (struct afs_vnode *) _vnode;
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if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
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SLAB_CTOR_CONSTRUCTOR) {
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memset(vnode, 0, sizeof(*vnode));
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inode_init_once(&vnode->vfs_inode);
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init_waitqueue_head(&vnode->update_waitq);
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spin_lock_init(&vnode->lock);
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INIT_LIST_HEAD(&vnode->cb_link);
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INIT_LIST_HEAD(&vnode->cb_hash_link);
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afs_timer_init(&vnode->cb_timeout,
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&afs_vnode_cb_timed_out_ops);
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}
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} /* end afs_i_init_once() */
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/*****************************************************************************/
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/*
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* allocate an AFS inode struct from our slab cache
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*/
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static struct inode *afs_alloc_inode(struct super_block *sb)
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{
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struct afs_vnode *vnode;
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vnode = (struct afs_vnode *)
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kmem_cache_alloc(afs_inode_cachep, SLAB_KERNEL);
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if (!vnode)
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return NULL;
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atomic_inc(&afs_count_active_inodes);
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memset(&vnode->fid, 0, sizeof(vnode->fid));
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memset(&vnode->status, 0, sizeof(vnode->status));
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vnode->volume = NULL;
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vnode->update_cnt = 0;
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vnode->flags = 0;
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return &vnode->vfs_inode;
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} /* end afs_alloc_inode() */
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/*****************************************************************************/
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/*
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* destroy an AFS inode struct
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*/
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static void afs_destroy_inode(struct inode *inode)
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{
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_enter("{%lu}", inode->i_ino);
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kmem_cache_free(afs_inode_cachep, AFS_FS_I(inode));
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atomic_dec(&afs_count_active_inodes);
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} /* end afs_destroy_inode() */
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