Linux-2.6.12-rc2v2.6.12-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!

1 files changed, 441 insertions, 0 deletions

diff --git a/fs/afs/super.c b/fs/afs/super.c
new file mode 100644
index 000000000000..d6fa8e5999df
--- /dev/null
+++ b/fs/afs/super.c
@@ -0,0 +1,441 @@
+/*
+ * Copyright (c) 2002 Red Hat, Inc. All rights reserved.
+ *
+ * This software may be freely redistributed under the terms of the
+ * GNU General Public License.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+ *
+ * Authors: David Howells <dhowells@redhat.com>
+ *          David Woodhouse <dwmw2@cambridge.redhat.com>
+ *
+ */
+
+#include <linux/kernel.h>
+#include <linux/module.h>
+#include <linux/init.h>
+#include <linux/slab.h>
+#include <linux/fs.h>
+#include <linux/pagemap.h>
+#include "vnode.h"
+#include "volume.h"
+#include "cell.h"
+#include "cmservice.h"
+#include "fsclient.h"
+#include "super.h"
+#include "internal.h"
+
+#define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */
+
+struct afs_mount_params {
+        int                     rwpath;
+        struct afs_cell         *default_cell;
+        struct afs_volume       *volume;
+};
+
+static void afs_i_init_once(void *foo, kmem_cache_t *cachep,
+                            unsigned long flags);
+
+static struct super_block *afs_get_sb(struct file_system_type *fs_type,
+                                      int flags, const char *dev_name,
+                                      void *data);
+
+static struct inode *afs_alloc_inode(struct super_block *sb);
+
+static void afs_put_super(struct super_block *sb);
+
+static void afs_destroy_inode(struct inode *inode);
+
+static struct file_system_type afs_fs_type = {
+        .owner          = THIS_MODULE,
+        .name           = "afs",
+        .get_sb         = afs_get_sb,
+        .kill_sb        = kill_anon_super,
+        .fs_flags       = FS_BINARY_MOUNTDATA,
+};
+
+static struct super_operations afs_super_ops = {
+        .statfs         = simple_statfs,
+        .alloc_inode    = afs_alloc_inode,
+        .drop_inode     = generic_delete_inode,
+        .destroy_inode  = afs_destroy_inode,
+        .clear_inode    = afs_clear_inode,
+        .put_super      = afs_put_super,
+};
+
+static kmem_cache_t *afs_inode_cachep;
+static atomic_t afs_count_active_inodes;
+
+/*****************************************************************************/
+/*
+ * initialise the filesystem
+ */
+int __init afs_fs_init(void)
+{
+        int ret;
+
+        _enter("");
+
+        afs_timer_init(&afs_mntpt_expiry_timer, &afs_mntpt_expiry_timer_ops);
+
+        /* create ourselves an inode cache */
+        atomic_set(&afs_count_active_inodes, 0);
+
+        ret = -ENOMEM;
+        afs_inode_cachep = kmem_cache_create("afs_inode_cache",
+                                             sizeof(struct afs_vnode),
+                                             0,
+                                             SLAB_HWCACHE_ALIGN,
+                                             afs_i_init_once,
+                                             NULL);
+        if (!afs_inode_cachep) {
+                printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n");
+                return ret;
+        }
+
+        /* now export our filesystem to lesser mortals */
+        ret = register_filesystem(&afs_fs_type);
+        if (ret < 0) {
+                kmem_cache_destroy(afs_inode_cachep);
+                kleave(" = %d", ret);
+                return ret;
+        }
+
+        kleave(" = 0");
+        return 0;
+} /* end afs_fs_init() */
+
+/*****************************************************************************/
+/*
+ * clean up the filesystem
+ */
+void __exit afs_fs_exit(void)
+{
+        unregister_filesystem(&afs_fs_type);
+
+        if (atomic_read(&afs_count_active_inodes) != 0) {
+                printk("kAFS: %d active inode objects still present\n",
+                       atomic_read(&afs_count_active_inodes));
+                BUG();
+        }
+
+        kmem_cache_destroy(afs_inode_cachep);
+
+} /* end afs_fs_exit() */
+
+/*****************************************************************************/
+/*
+ * check that an argument has a value
+ */
+static int want_arg(char **_value, const char *option)
+{
+        if (!_value || !*_value || !**_value) {
+                printk(KERN_NOTICE "kAFS: %s: argument missing\n", option);
+                return 0;
+        }
+        return 1;
+} /* end want_arg() */
+
+/*****************************************************************************/
+/*
+ * check that there's no subsequent value
+ */
+static int want_no_value(char *const *_value, const char *option)
+{
+        if (*_value && **_value) {
+                printk(KERN_NOTICE "kAFS: %s: Invalid argument: %s\n",
+                       option, *_value);
+                return 0;
+        }
+        return 1;
+} /* end want_no_value() */
+
+/*****************************************************************************/
+/*
+ * parse the mount options
+ * - this function has been shamelessly adapted from the ext3 fs which
+ *   shamelessly adapted it from the msdos fs
+ */
+static int afs_super_parse_options(struct afs_mount_params *params,
+                                   char *options,
+                                   const char **devname)
+{
+        char *key, *value;
+        int ret;
+
+        _enter("%s", options);
+
+        options[PAGE_SIZE - 1] = 0;
+
+        ret = 0;
+        while ((key = strsep(&options, ",")) != 0)
+        {
+                value = strchr(key, '=');
+                if (value)
+                        *value++ = 0;
+
+                printk("kAFS: KEY: %s, VAL:%s\n", key, value ?: "-");
+
+                if (strcmp(key, "rwpath") == 0) {
+                        if (!want_no_value(&value, "rwpath"))
+                                return -EINVAL;
+                        params->rwpath = 1;
+                        continue;
+                }
+                else if (strcmp(key, "vol") == 0) {
+                        if (!want_arg(&value, "vol"))
+                                return -EINVAL;
+                        *devname = value;
+                        continue;
+                }
+                else if (strcmp(key, "cell") == 0) {
+                        if (!want_arg(&value, "cell"))
+                                return -EINVAL;
+                        afs_put_cell(params->default_cell);
+                        ret = afs_cell_lookup(value,
+                                              strlen(value),
+                                              &params->default_cell);
+                        if (ret < 0)
+                                return -EINVAL;
+                        continue;
+                }
+
+                printk("kAFS: Unknown mount option: '%s'\n",  key);
+                ret = -EINVAL;
+                goto error;
+        }
+
+        ret = 0;
+
+ error:
+        _leave(" = %d", ret);
+        return ret;
+} /* end afs_super_parse_options() */
+
+/*****************************************************************************/
+/*
+ * check a superblock to see if it's the one we're looking for
+ */
+static int afs_test_super(struct super_block *sb, void *data)
+{
+        struct afs_mount_params *params = data;
+        struct afs_super_info *as = sb->s_fs_info;
+
+        return as->volume == params->volume;
+} /* end afs_test_super() */
+
+/*****************************************************************************/
+/*
+ * fill in the superblock
+ */
+static int afs_fill_super(struct super_block *sb, void *data, int silent)
+{
+        struct afs_mount_params *params = data;
+        struct afs_super_info *as = NULL;
+        struct afs_fid fid;
+        struct dentry *root = NULL;
+        struct inode *inode = NULL;
+        int ret;
+
+        kenter("");
+
+        /* allocate a superblock info record */
+        as = kmalloc(sizeof(struct afs_super_info), GFP_KERNEL);
+        if (!as) {
+                _leave(" = -ENOMEM");
+                return -ENOMEM;
+        }
+
+        memset(as, 0, sizeof(struct afs_super_info));
+
+        afs_get_volume(params->volume);
+        as->volume = params->volume;
+
+        /* fill in the superblock */
+        sb->s_blocksize         = PAGE_CACHE_SIZE;
+        sb->s_blocksize_bits    = PAGE_CACHE_SHIFT;
+        sb->s_magic             = AFS_FS_MAGIC;
+        sb->s_op                = &afs_super_ops;
+        sb->s_fs_info           = as;
+
+        /* allocate the root inode and dentry */
+        fid.vid         = as->volume->vid;
+        fid.vnode       = 1;
+        fid.unique      = 1;
+        ret = afs_iget(sb, &fid, &inode);
+        if (ret < 0)
+                goto error;
+
+        ret = -ENOMEM;
+        root = d_alloc_root(inode);
+        if (!root)
+                goto error;
+
+        sb->s_root = root;
+
+        kleave(" = 0");
+        return 0;
+
+ error:
+        iput(inode);
+        afs_put_volume(as->volume);
+        kfree(as);
+
+        sb->s_fs_info = NULL;
+
+        kleave(" = %d", ret);
+        return ret;
+} /* end afs_fill_super() */
+
+/*****************************************************************************/
+/*
+ * get an AFS superblock
+ * - TODO: don't use get_sb_nodev(), but rather call sget() directly
+ */
+static struct super_block *afs_get_sb(struct file_system_type *fs_type,
+                                      int flags,
+                                      const char *dev_name,
+                                      void *options)
+{
+        struct afs_mount_params params;
+        struct super_block *sb;
+        int ret;
+
+        _enter(",,%s,%p", dev_name, options);
+
+        memset(&params, 0, sizeof(params));
+
+        /* start the cache manager */
+        ret = afscm_start();
+        if (ret < 0) {
+                _leave(" = %d", ret);
+                return ERR_PTR(ret);
+        }
+
+        /* parse the options */
+        if (options) {
+                ret = afs_super_parse_options(&params, options, &dev_name);
+                if (ret < 0)
+                        goto error;
+                if (!dev_name) {
+                        printk("kAFS: no volume name specified\n");
+                        ret = -EINVAL;
+                        goto error;
+                }
+        }
+
+        /* parse the device name */
+        ret = afs_volume_lookup(dev_name,
+                                params.default_cell,
+                                params.rwpath,
+                                &params.volume);
+        if (ret < 0)
+                goto error;
+
+        /* allocate a deviceless superblock */
+        sb = sget(fs_type, afs_test_super, set_anon_super, &params);
+        if (IS_ERR(sb))
+                goto error;
+
+        sb->s_flags = flags;
+
+        ret = afs_fill_super(sb, &params, flags & MS_VERBOSE ? 1 : 0);
+        if (ret < 0) {
+                up_write(&sb->s_umount);
+                deactivate_super(sb);
+                goto error;
+        }
+        sb->s_flags |= MS_ACTIVE;
+
+        afs_put_volume(params.volume);
+        afs_put_cell(params.default_cell);
+        _leave(" = %p", sb);
+        return sb;
+
+ error:
+        afs_put_volume(params.volume);
+        afs_put_cell(params.default_cell);
+        afscm_stop();
+        _leave(" = %d", ret);
+        return ERR_PTR(ret);
+} /* end afs_get_sb() */
+
+/*****************************************************************************/
+/*
+ * finish the unmounting process on the superblock
+ */
+static void afs_put_super(struct super_block *sb)
+{
+        struct afs_super_info *as = sb->s_fs_info;
+
+        _enter("");
+
+        afs_put_volume(as->volume);
+        afscm_stop();
+
+        _leave("");
+} /* end afs_put_super() */
+
+/*****************************************************************************/
+/*
+ * initialise an inode cache slab element prior to any use
+ */
+static void afs_i_init_once(void *_vnode, kmem_cache_t *cachep,
+                            unsigned long flags)
+{
+        struct afs_vnode *vnode = (struct afs_vnode *) _vnode;
+
+        if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
+            SLAB_CTOR_CONSTRUCTOR) {
+                memset(vnode, 0, sizeof(*vnode));
+                inode_init_once(&vnode->vfs_inode);
+                init_waitqueue_head(&vnode->update_waitq);
+                spin_lock_init(&vnode->lock);
+                INIT_LIST_HEAD(&vnode->cb_link);
+                INIT_LIST_HEAD(&vnode->cb_hash_link);
+                afs_timer_init(&vnode->cb_timeout,
+                               &afs_vnode_cb_timed_out_ops);
+        }
+
+} /* end afs_i_init_once() */
+
+/*****************************************************************************/
+/*
+ * allocate an AFS inode struct from our slab cache
+ */
+static struct inode *afs_alloc_inode(struct super_block *sb)
+{
+        struct afs_vnode *vnode;
+
+        vnode = (struct afs_vnode *)
+                kmem_cache_alloc(afs_inode_cachep, SLAB_KERNEL);
+        if (!vnode)
+                return NULL;
+
+        atomic_inc(&afs_count_active_inodes);
+
+        memset(&vnode->fid, 0, sizeof(vnode->fid));
+        memset(&vnode->status, 0, sizeof(vnode->status));
+
+        vnode->volume           = NULL;
+        vnode->update_cnt       = 0;
+        vnode->flags            = 0;
+
+        return &vnode->vfs_inode;
+} /* end afs_alloc_inode() */
+
+/*****************************************************************************/
+/*
+ * destroy an AFS inode struct
+ */
+static void afs_destroy_inode(struct inode *inode)
+{
+        _enter("{%lu}", inode->i_ino);
+
+        kmem_cache_free(afs_inode_cachep, AFS_FS_I(inode));
+
+        atomic_dec(&afs_count_active_inodes);
+
+} /* end afs_destroy_inode() */