Merge rsync://rsync.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6

1 files changed, 76 insertions, 118 deletions

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 7627022446b2..dcaaabd3b9c4 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -11,25 +11,20 @@
 #include <linux/pagemap.h>
 #include <linux/slab.h>
 #include <linux/file.h>
-#include <linux/mount.h>
 #include <linux/seq_file.h>
 #include <linux/init.h>
 #include <linux/module.h>
 #include <linux/parser.h>
 #include <linux/statfs.h>
+#include <linux/random.h>
 
 MODULE_AUTHOR("Miklos Szeredi <miklos@szeredi.hu>");
 MODULE_DESCRIPTION("Filesystem in Userspace");
 MODULE_LICENSE("GPL");
 
 static kmem_cache_t *fuse_inode_cachep;
-static struct subsystem connections_subsys;
-
-struct fuse_conn_attr {
-	struct attribute attr;
-	ssize_t (*show)(struct fuse_conn *, char *);
-	ssize_t (*store)(struct fuse_conn *, const char *, size_t);
-};
+struct list_head fuse_conn_list;
+DEFINE_MUTEX(fuse_mutex);
 
 #define FUSE_SUPER_MAGIC 0x65735546
 
@@ -104,6 +99,14 @@ static void fuse_clear_inode(struct inode *inode)
 	}
 }
 
+static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
+{
+	if (*flags & MS_MANDLOCK)
+		return -EINVAL;
+
+	return 0;
+}
+
 void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr)
 {
 	if (S_ISREG(inode->i_mode) && i_size_read(inode) != attr->size)
@@ -195,31 +198,29 @@ struct inode *fuse_iget(struct super_block *sb, unsigned long nodeid,
 	return inode;
 }
 
-static void fuse_umount_begin(struct super_block *sb)
+static void fuse_umount_begin(struct vfsmount *vfsmnt, int flags)
 {
-	fuse_abort_conn(get_fuse_conn_super(sb));
+	if (flags & MNT_FORCE)
+		fuse_abort_conn(get_fuse_conn_super(vfsmnt->mnt_sb));
 }
 
 static void fuse_put_super(struct super_block *sb)
 {
 	struct fuse_conn *fc = get_fuse_conn_super(sb);
 
-	down_write(&fc->sbput_sem);
-	while (!list_empty(&fc->background))
-		fuse_release_background(fc,
-					list_entry(fc->background.next,
-						   struct fuse_req, bg_entry));
-
 	spin_lock(&fc->lock);
-	fc->mounted = 0;
 	fc->connected = 0;
+	fc->blocked = 0;
 	spin_unlock(&fc->lock);
-	up_write(&fc->sbput_sem);
 	/* Flush all readers on this fs */
 	kill_fasync(&fc->fasync, SIGIO, POLL_IN);
 	wake_up_all(&fc->waitq);
-	kobject_del(&fc->kobj);
-	kobject_put(&fc->kobj);
+	wake_up_all(&fc->blocked_waitq);
+	mutex_lock(&fuse_mutex);
+	list_del(&fc->entry);
+	fuse_ctl_remove_conn(fc);
+	mutex_unlock(&fuse_mutex);
+	fuse_conn_put(fc);
 }
 
 static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr)
@@ -236,8 +237,9 @@ static void convert_fuse_statfs(struct kstatfs *stbuf, struct fuse_kstatfs *attr
 	/* fsid is left zero */
 }
 
-static int fuse_statfs(struct super_block *sb, struct kstatfs *buf)
+static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
 {
+	struct super_block *sb = dentry->d_sb;
 	struct fuse_conn *fc = get_fuse_conn_super(sb);
 	struct fuse_req *req;
 	struct fuse_statfs_out outarg;
@@ -368,11 +370,6 @@ static int fuse_show_options(struct seq_file *m, struct vfsmount *mnt)
 	return 0;
 }
 
-static void fuse_conn_release(struct kobject *kobj)
-{
-	kfree(get_fuse_conn_kobj(kobj));
-}
-
 static struct fuse_conn *new_conn(void)
 {
 	struct fuse_conn *fc;
@@ -380,24 +377,35 @@ static struct fuse_conn *new_conn(void)
 	fc = kzalloc(sizeof(*fc), GFP_KERNEL);
 	if (fc) {
 		spin_lock_init(&fc->lock);
+		atomic_set(&fc->count, 1);
 		init_waitqueue_head(&fc->waitq);
 		init_waitqueue_head(&fc->blocked_waitq);
 		INIT_LIST_HEAD(&fc->pending);
 		INIT_LIST_HEAD(&fc->processing);
 		INIT_LIST_HEAD(&fc->io);
-		INIT_LIST_HEAD(&fc->background);
-		init_rwsem(&fc->sbput_sem);
-		kobj_set_kset_s(fc, connections_subsys);
-		kobject_init(&fc->kobj);
+		INIT_LIST_HEAD(&fc->interrupts);
 		atomic_set(&fc->num_waiting, 0);
 		fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
 		fc->bdi.unplug_io_fn = default_unplug_io_fn;
 		fc->reqctr = 0;
 		fc->blocked = 1;
+		get_random_bytes(&fc->scramble_key, sizeof(fc->scramble_key));
 	}
 	return fc;
 }
 
+void fuse_conn_put(struct fuse_conn *fc)
+{
+	if (atomic_dec_and_test(&fc->count))
+		kfree(fc);
+}
+
+struct fuse_conn *fuse_conn_get(struct fuse_conn *fc)
+{
+	atomic_inc(&fc->count);
+	return fc;
+}
+
 static struct inode *get_root_inode(struct super_block *sb, unsigned mode)
 {
 	struct fuse_attr attr;
@@ -413,6 +421,7 @@ static struct super_operations fuse_super_operations = {
 	.destroy_inode  = fuse_destroy_inode,
 	.read_inode	= fuse_read_inode,
 	.clear_inode	= fuse_clear_inode,
+	.remount_fs	= fuse_remount_fs,
 	.put_super	= fuse_put_super,
 	.umount_begin	= fuse_umount_begin,
 	.statfs		= fuse_statfs,
@@ -432,8 +441,12 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
 			ra_pages = arg->max_readahead / PAGE_CACHE_SIZE;
 			if (arg->flags & FUSE_ASYNC_READ)
 				fc->async_read = 1;
-		} else
+			if (!(arg->flags & FUSE_POSIX_LOCKS))
+				fc->no_lock = 1;
+		} else {
 			ra_pages = fc->max_read / PAGE_CACHE_SIZE;
+			fc->no_lock = 1;
+		}
 
 		fc->bdi.ra_pages = min(fc->bdi.ra_pages, ra_pages);
 		fc->minor = arg->minor;
@@ -451,7 +464,7 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
 	arg->major = FUSE_KERNEL_VERSION;
 	arg->minor = FUSE_KERNEL_MINOR_VERSION;
 	arg->max_readahead = fc->bdi.ra_pages * PAGE_CACHE_SIZE;
-	arg->flags |= FUSE_ASYNC_READ;
+	arg->flags |= FUSE_ASYNC_READ | FUSE_POSIX_LOCKS;
 	req->in.h.opcode = FUSE_INIT;
 	req->in.numargs = 1;
 	req->in.args[0].size = sizeof(*arg);
@@ -467,10 +480,9 @@ static void fuse_send_init(struct fuse_conn *fc, struct fuse_req *req)
 	request_send_background(fc, req);
 }
 
-static unsigned long long conn_id(void)
+static u64 conn_id(void)
 {
-	/* BKL is held for ->get_sb() */
-	static unsigned long long ctr = 1;
+	static u64 ctr = 1;
 	return ctr++;
 }
 
@@ -484,6 +496,9 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
 	struct fuse_req *init_req;
 	int err;
 
+	if (sb->s_flags & MS_MANDLOCK)
+		return -EINVAL;
+
 	if (!parse_fuse_opt((char *) data, &d))
 		return -EINVAL;
 
@@ -527,25 +542,21 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
 	if (!init_req)
 		goto err_put_root;
 
-	err = kobject_set_name(&fc->kobj, "%llu", conn_id());
-	if (err)
-		goto err_free_req;
-
-	err = kobject_add(&fc->kobj);
-	if (err)
-		goto err_free_req;
-
-	/* Setting file->private_data can't race with other mount()
-	   instances, since BKL is held for ->get_sb() */
+	mutex_lock(&fuse_mutex);
 	err = -EINVAL;
 	if (file->private_data)
-		goto err_kobject_del;
+		goto err_unlock;
 
+	fc->id = conn_id();
+	err = fuse_ctl_add_conn(fc);
+	if (err)
+		goto err_unlock;
+
+	list_add_tail(&fc->entry, &fuse_conn_list);
 	sb->s_root = root_dentry;
-	fc->mounted = 1;
 	fc->connected = 1;
-	kobject_get(&fc->kobj);
-	file->private_data = fc;
+	file->private_data = fuse_conn_get(fc);
+	mutex_unlock(&fuse_mutex);
 	/*
 	 * atomic_dec_and_test() in fput() provides the necessary
 	 * memory barrier for file->private_data to be visible on all
@@ -557,23 +568,22 @@ static int fuse_fill_super(struct super_block *sb, void *data, int silent)
 
 	return 0;
 
- err_kobject_del:
-	kobject_del(&fc->kobj);
- err_free_req:
+ err_unlock:
+	mutex_unlock(&fuse_mutex);
 	fuse_request_free(init_req);
  err_put_root:
 	dput(root_dentry);
  err:
 	fput(file);
-	kobject_put(&fc->kobj);
+	fuse_conn_put(fc);
 	return err;
 }
 
-static struct super_block *fuse_get_sb(struct file_system_type *fs_type,
-				       int flags, const char *dev_name,
-				       void *raw_data)
+static int fuse_get_sb(struct file_system_type *fs_type,
+		       int flags, const char *dev_name,
+		       void *raw_data, struct vfsmount *mnt)
 {
-	return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super);
+	return get_sb_nodev(fs_type, flags, raw_data, fuse_fill_super, mnt);
 }
 
 static struct file_system_type fuse_fs_type = {
@@ -583,68 +593,8 @@ static struct file_system_type fuse_fs_type = {
 	.kill_sb	= kill_anon_super,
 };
 
-static ssize_t fuse_conn_waiting_show(struct fuse_conn *fc, char *page)
-{
-	return sprintf(page, "%i\n", atomic_read(&fc->num_waiting));
-}
-
-static ssize_t fuse_conn_abort_store(struct fuse_conn *fc, const char *page,
-				     size_t count)
-{
-	fuse_abort_conn(fc);
-	return count;
-}
-
-static struct fuse_conn_attr fuse_conn_waiting =
-	__ATTR(waiting, 0400, fuse_conn_waiting_show, NULL);
-static struct fuse_conn_attr fuse_conn_abort =
-	__ATTR(abort, 0600, NULL, fuse_conn_abort_store);
-
-static struct attribute *fuse_conn_attrs[] = {
-	&fuse_conn_waiting.attr,
-	&fuse_conn_abort.attr,
-	NULL,
-};
-
-static ssize_t fuse_conn_attr_show(struct kobject *kobj,
-				   struct attribute *attr,
-				   char *page)
-{
-	struct fuse_conn_attr *fca =
-		container_of(attr, struct fuse_conn_attr, attr);
-
-	if (fca->show)
-		return fca->show(get_fuse_conn_kobj(kobj), page);
-	else
-		return -EACCES;
-}
-
-static ssize_t fuse_conn_attr_store(struct kobject *kobj,
-				    struct attribute *attr,
-				    const char *page, size_t count)
-{
-	struct fuse_conn_attr *fca =
-		container_of(attr, struct fuse_conn_attr, attr);
-
-	if (fca->store)
-		return fca->store(get_fuse_conn_kobj(kobj), page, count);
-	else
-		return -EACCES;
-}
-
-static struct sysfs_ops fuse_conn_sysfs_ops = {
-	.show	= &fuse_conn_attr_show,
-	.store	= &fuse_conn_attr_store,
-};
-
-static struct kobj_type ktype_fuse_conn = {
-	.release	= fuse_conn_release,
-	.sysfs_ops	= &fuse_conn_sysfs_ops,
-	.default_attrs	= fuse_conn_attrs,
-};
-
 static decl_subsys(fuse, NULL, NULL);
-static decl_subsys(connections, &ktype_fuse_conn, NULL);
+static decl_subsys(connections, NULL, NULL);
 
 static void fuse_inode_init_once(void *foo, kmem_cache_t *cachep,
 				 unsigned long flags)
@@ -718,6 +668,7 @@ static int __init fuse_init(void)
 	printk("fuse init (API version %i.%i)\n",
 	       FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION);
 
+	INIT_LIST_HEAD(&fuse_conn_list);
 	res = fuse_fs_init();
 	if (res)
 		goto err;
@@ -730,8 +681,14 @@ static int __init fuse_init(void)
 	if (res)
 		goto err_dev_cleanup;
 
+	res = fuse_ctl_init();
+	if (res)
+		goto err_sysfs_cleanup;
+
 	return 0;
 
+ err_sysfs_cleanup:
+	fuse_sysfs_cleanup();
  err_dev_cleanup:
 	fuse_dev_cleanup();
  err_fs_cleanup:
@@ -744,6 +701,7 @@ static void __exit fuse_exit(void)
 {
 	printk(KERN_DEBUG "fuse exit\n");
 
+	fuse_ctl_cleanup();
 	fuse_sysfs_cleanup();
 	fuse_fs_cleanup();
 	fuse_dev_cleanup();