init android origin source code

1 files changed, 1261 insertions, 0 deletions

diff --git a/ANDROID_3.4.5/fs/super.c b/ANDROID_3.4.5/fs/super.c
new file mode 100644
index 00000000..cf001775
--- /dev/null
+++ b/ANDROID_3.4.5/fs/super.c
@@ -0,0 +1,1261 @@
+/*
+ *  linux/fs/super.c
+ *
+ *  Copyright (C) 1991, 1992  Linus Torvalds
+ *
+ *  super.c contains code to handle: - mount structures
+ *                                   - super-block tables
+ *                                   - filesystem drivers list
+ *                                   - mount system call
+ *                                   - umount system call
+ *                                   - ustat system call
+ *
+ * GK 2/5/95  -  Changed to support mounting the root fs via NFS
+ *
+ *  Added kerneld support: Jacques Gelinas and Bjorn Ekwall
+ *  Added change_root: Werner Almesberger & Hans Lermen, Feb '96
+ *  Added options to /proc/mounts:
+ *    Torbjörn Lindh (torbjorn.lindh@gopta.se), April 14, 1996.
+ *  Added devfs support: Richard Gooch <rgooch@atnf.csiro.au>, 13-JAN-1998
+ *  Heavily rewritten for 'one fs - one tree' dcache architecture. AV, Mar 2000
+ */
+
+#include <linux/export.h>
+#include <linux/slab.h>
+#include <linux/acct.h>
+#include <linux/blkdev.h>
+#include <linux/mount.h>
+#include <linux/security.h>
+#include <linux/writeback.h>		/* for the emergency remount stuff */
+#include <linux/idr.h>
+#include <linux/mutex.h>
+#include <linux/backing-dev.h>
+#include <linux/rculist_bl.h>
+#include <linux/cleancache.h>
+#include <linux/fsnotify.h>
+#include "internal.h"
+
+
+LIST_HEAD(super_blocks);
+DEFINE_SPINLOCK(sb_lock);
+
+/*
+ * One thing we have to be careful of with a per-sb shrinker is that we don't
+ * drop the last active reference to the superblock from within the shrinker.
+ * If that happens we could trigger unregistering the shrinker from within the
+ * shrinker path and that leads to deadlock on the shrinker_rwsem. Hence we
+ * take a passive reference to the superblock to avoid this from occurring.
+ */
+static int prune_super(struct shrinker *shrink, struct shrink_control *sc)
+{
+	struct super_block *sb;
+	int	fs_objects = 0;
+	int	total_objects;
+
+	sb = container_of(shrink, struct super_block, s_shrink);
+
+	/*
+	 * Deadlock avoidance.  We may hold various FS locks, and we don't want
+	 * to recurse into the FS that called us in clear_inode() and friends..
+	 */
+	if (sc->nr_to_scan && !(sc->gfp_mask & __GFP_FS))
+		return -1;
+
+	if (!grab_super_passive(sb))
+		return !sc->nr_to_scan ? 0 : -1;
+
+	if (sb->s_op && sb->s_op->nr_cached_objects)
+		fs_objects = sb->s_op->nr_cached_objects(sb);
+
+	total_objects = sb->s_nr_dentry_unused +
+			sb->s_nr_inodes_unused + fs_objects + 1;
+
+	if (sc->nr_to_scan) {
+		int	dentries;
+		int	inodes;
+
+		/* proportion the scan between the caches */
+		dentries = (sc->nr_to_scan * sb->s_nr_dentry_unused) /
+							total_objects;
+		inodes = (sc->nr_to_scan * sb->s_nr_inodes_unused) /
+							total_objects;
+		if (fs_objects)
+			fs_objects = (sc->nr_to_scan * fs_objects) /
+							total_objects;
+		/*
+		 * prune the dcache first as the icache is pinned by it, then
+		 * prune the icache, followed by the filesystem specific caches
+		 */
+		prune_dcache_sb(sb, dentries);
+		prune_icache_sb(sb, inodes);
+
+		if (fs_objects && sb->s_op->free_cached_objects) {
+			sb->s_op->free_cached_objects(sb, fs_objects);
+			fs_objects = sb->s_op->nr_cached_objects(sb);
+		}
+		total_objects = sb->s_nr_dentry_unused +
+				sb->s_nr_inodes_unused + fs_objects;
+	}
+
+	total_objects = (total_objects / 100) * sysctl_vfs_cache_pressure;
+	drop_super(sb);
+	return total_objects;
+}
+
+/**
+ *	alloc_super	-	create new superblock
+ *	@type:	filesystem type superblock should belong to
+ *
+ *	Allocates and initializes a new &struct super_block.  alloc_super()
+ *	returns a pointer new superblock or %NULL if allocation had failed.
+ */
+static struct super_block *alloc_super(struct file_system_type *type)
+{
+	struct super_block *s = kzalloc(sizeof(struct super_block),  GFP_USER);
+	static const struct super_operations default_op;
+
+	if (s) {
+		if (security_sb_alloc(s)) {
+			kfree(s);
+			s = NULL;
+			goto out;
+		}
+#ifdef CONFIG_SMP
+		s->s_files = alloc_percpu(struct list_head);
+		if (!s->s_files) {
+			security_sb_free(s);
+			kfree(s);
+			s = NULL;
+			goto out;
+		} else {
+			int i;
+
+			for_each_possible_cpu(i)
+				INIT_LIST_HEAD(per_cpu_ptr(s->s_files, i));
+		}
+#else
+		INIT_LIST_HEAD(&s->s_files);
+#endif
+		s->s_bdi = &default_backing_dev_info;
+		INIT_HLIST_NODE(&s->s_instances);
+		INIT_HLIST_BL_HEAD(&s->s_anon);
+		INIT_LIST_HEAD(&s->s_inodes);
+		INIT_LIST_HEAD(&s->s_dentry_lru);
+		INIT_LIST_HEAD(&s->s_inode_lru);
+		spin_lock_init(&s->s_inode_lru_lock);
+		INIT_LIST_HEAD(&s->s_mounts);
+		init_rwsem(&s->s_umount);
+		mutex_init(&s->s_lock);
+		lockdep_set_class(&s->s_umount, &type->s_umount_key);
+		/*
+		 * The locking rules for s_lock are up to the
+		 * filesystem. For example ext3fs has different
+		 * lock ordering than usbfs:
+		 */
+		lockdep_set_class(&s->s_lock, &type->s_lock_key);
+		/*
+		 * sget() can have s_umount recursion.
+		 *
+		 * When it cannot find a suitable sb, it allocates a new
+		 * one (this one), and tries again to find a suitable old
+		 * one.
+		 *
+		 * In case that succeeds, it will acquire the s_umount
+		 * lock of the old one. Since these are clearly distrinct
+		 * locks, and this object isn't exposed yet, there's no
+		 * risk of deadlocks.
+		 *
+		 * Annotate this by putting this lock in a different
+		 * subclass.
+		 */
+		down_write_nested(&s->s_umount, SINGLE_DEPTH_NESTING);
+		s->s_count = 1;
+		atomic_set(&s->s_active, 1);
+		mutex_init(&s->s_vfs_rename_mutex);
+		lockdep_set_class(&s->s_vfs_rename_mutex, &type->s_vfs_rename_key);
+		mutex_init(&s->s_dquot.dqio_mutex);
+		mutex_init(&s->s_dquot.dqonoff_mutex);
+		init_rwsem(&s->s_dquot.dqptr_sem);
+		init_waitqueue_head(&s->s_wait_unfrozen);
+		s->s_maxbytes = MAX_NON_LFS;
+		s->s_op = &default_op;
+		s->s_time_gran = 1000000000;
+		s->cleancache_poolid = -1;
+
+		s->s_shrink.seeks = DEFAULT_SEEKS;
+		s->s_shrink.shrink = prune_super;
+		s->s_shrink.batch = 1024;
+	}
+out:
+	return s;
+}
+
+/**
+ *	destroy_super	-	frees a superblock
+ *	@s: superblock to free
+ *
+ *	Frees a superblock.
+ */
+static inline void destroy_super(struct super_block *s)
+{
+#ifdef CONFIG_SMP
+	free_percpu(s->s_files);
+#endif
+	security_sb_free(s);
+	WARN_ON(!list_empty(&s->s_mounts));
+	kfree(s->s_subtype);
+	kfree(s->s_options);
+	kfree(s);
+}
+
+/* Superblock refcounting  */
+
+/*
+ * Drop a superblock's refcount.  The caller must hold sb_lock.
+ */
+static void __put_super(struct super_block *sb)
+{
+	if (!--sb->s_count) {
+		list_del_init(&sb->s_list);
+		destroy_super(sb);
+	}
+}
+
+/**
+ *	put_super	-	drop a temporary reference to superblock
+ *	@sb: superblock in question
+ *
+ *	Drops a temporary reference, frees superblock if there's no
+ *	references left.
+ */
+static void put_super(struct super_block *sb)
+{
+	spin_lock(&sb_lock);
+	__put_super(sb);
+	spin_unlock(&sb_lock);
+}
+
+
+/**
+ *	deactivate_locked_super	-	drop an active reference to superblock
+ *	@s: superblock to deactivate
+ *
+ *	Drops an active reference to superblock, converting it into a temprory
+ *	one if there is no other active references left.  In that case we
+ *	tell fs driver to shut it down and drop the temporary reference we
+ *	had just acquired.
+ *
+ *	Caller holds exclusive lock on superblock; that lock is released.
+ */
+void deactivate_locked_super(struct super_block *s)
+{
+	struct file_system_type *fs = s->s_type;
+	if (atomic_dec_and_test(&s->s_active)) {
+		cleancache_invalidate_fs(s);
+		fs->kill_sb(s);
+
+		/* caches are now gone, we can safely kill the shrinker now */
+		unregister_shrinker(&s->s_shrink);
+
+		/*
+		 * We need to call rcu_barrier so all the delayed rcu free
+		 * inodes are flushed before we release the fs module.
+		 */
+		rcu_barrier();
+		put_filesystem(fs);
+		put_super(s);
+	} else {
+		up_write(&s->s_umount);
+	}
+}
+
+EXPORT_SYMBOL(deactivate_locked_super);
+
+/**
+ *	deactivate_super	-	drop an active reference to superblock
+ *	@s: superblock to deactivate
+ *
+ *	Variant of deactivate_locked_super(), except that superblock is *not*
+ *	locked by caller.  If we are going to drop the final active reference,
+ *	lock will be acquired prior to that.
+ */
+void deactivate_super(struct super_block *s)
+{
+        if (!atomic_add_unless(&s->s_active, -1, 1)) {
+		down_write(&s->s_umount);
+		deactivate_locked_super(s);
+	}
+}
+
+EXPORT_SYMBOL(deactivate_super);
+
+/**
+ *	grab_super - acquire an active reference
+ *	@s: reference we are trying to make active
+ *
+ *	Tries to acquire an active reference.  grab_super() is used when we
+ * 	had just found a superblock in super_blocks or fs_type->fs_supers
+ *	and want to turn it into a full-blown active reference.  grab_super()
+ *	is called with sb_lock held and drops it.  Returns 1 in case of
+ *	success, 0 if we had failed (superblock contents was already dead or
+ *	dying when grab_super() had been called).
+ */
+static int grab_super(struct super_block *s) __releases(sb_lock)
+{
+	if (atomic_inc_not_zero(&s->s_active)) {
+		spin_unlock(&sb_lock);
+		return 1;
+	}
+	/* it's going away */
+	s->s_count++;
+	spin_unlock(&sb_lock);
+	/* wait for it to die */
+	down_write(&s->s_umount);
+	up_write(&s->s_umount);
+	put_super(s);
+	return 0;
+}
+
+/*
+ *	grab_super_passive - acquire a passive reference
+ *	@s: reference we are trying to grab
+ *
+ *	Tries to acquire a passive reference. This is used in places where we
+ *	cannot take an active reference but we need to ensure that the
+ *	superblock does not go away while we are working on it. It returns
+ *	false if a reference was not gained, and returns true with the s_umount
+ *	lock held in read mode if a reference is gained. On successful return,
+ *	the caller must drop the s_umount lock and the passive reference when
+ *	done.
+ */
+bool grab_super_passive(struct super_block *sb)
+{
+	spin_lock(&sb_lock);
+	if (hlist_unhashed(&sb->s_instances)) {
+		spin_unlock(&sb_lock);
+		return false;
+	}
+
+	sb->s_count++;
+	spin_unlock(&sb_lock);
+
+	if (down_read_trylock(&sb->s_umount)) {
+		if (sb->s_root && (sb->s_flags & MS_BORN))
+			return true;
+		up_read(&sb->s_umount);
+	}
+
+	put_super(sb);
+	return false;
+}
+
+/*
+ * Superblock locking.  We really ought to get rid of these two.
+ */
+void lock_super(struct super_block * sb)
+{
+	mutex_lock(&sb->s_lock);
+}
+
+void unlock_super(struct super_block * sb)
+{
+	mutex_unlock(&sb->s_lock);
+}
+
+EXPORT_SYMBOL(lock_super);
+EXPORT_SYMBOL(unlock_super);
+
+/**
+ *	generic_shutdown_super	-	common helper for ->kill_sb()
+ *	@sb: superblock to kill
+ *
+ *	generic_shutdown_super() does all fs-independent work on superblock
+ *	shutdown.  Typical ->kill_sb() should pick all fs-specific objects
+ *	that need destruction out of superblock, call generic_shutdown_super()
+ *	and release aforementioned objects.  Note: dentries and inodes _are_
+ *	taken care of and do not need specific handling.
+ *
+ *	Upon calling this function, the filesystem may no longer alter or
+ *	rearrange the set of dentries belonging to this super_block, nor may it
+ *	change the attachments of dentries to inodes.
+ */
+void generic_shutdown_super(struct super_block *sb)
+{
+	const struct super_operations *sop = sb->s_op;
+
+	if (sb->s_root) {
+		shrink_dcache_for_umount(sb);
+		sync_filesystem(sb);
+		sb->s_flags &= ~MS_ACTIVE;
+
+		fsnotify_unmount_inodes(&sb->s_inodes);
+
+		evict_inodes(sb);
+
+		if (sop->put_super)
+			sop->put_super(sb);
+
+		if (!list_empty(&sb->s_inodes)) {
+			printk("VFS: Busy inodes after unmount of %s. "
+			   "Self-destruct in 5 seconds.  Have a nice day...\n",
+			   sb->s_id);
+		}
+	}
+	spin_lock(&sb_lock);
+	/* should be initialized for __put_super_and_need_restart() */
+	hlist_del_init(&sb->s_instances);
+	spin_unlock(&sb_lock);
+	up_write(&sb->s_umount);
+}
+
+EXPORT_SYMBOL(generic_shutdown_super);
+
+/**
+ *	sget	-	find or create a superblock
+ *	@type:	filesystem type superblock should belong to
+ *	@test:	comparison callback
+ *	@set:	setup callback
+ *	@data:	argument to each of them
+ */
+struct super_block *sget(struct file_system_type *type,
+			int (*test)(struct super_block *,void *),
+			int (*set)(struct super_block *,void *),
+			void *data)
+{
+	struct super_block *s = NULL;
+	struct hlist_node *node;
+	struct super_block *old;
+	int err;
+
+retry:
+	spin_lock(&sb_lock);
+	if (test) {
+		hlist_for_each_entry(old, node, &type->fs_supers, s_instances) {
+			if (!test(old, data))
+				continue;
+			if (!grab_super(old))
+				goto retry;
+			if (s) {
+				up_write(&s->s_umount);
+				destroy_super(s);
+				s = NULL;
+			}
+			down_write(&old->s_umount);
+			if (unlikely(!(old->s_flags & MS_BORN))) {
+				deactivate_locked_super(old);
+				goto retry;
+			}
+			return old;
+		}
+	}
+	if (!s) {
+		spin_unlock(&sb_lock);
+		s = alloc_super(type);
+		if (!s)
+			return ERR_PTR(-ENOMEM);
+		goto retry;
+	}
+		
+	err = set(s, data);
+	if (err) {
+		spin_unlock(&sb_lock);
+		up_write(&s->s_umount);
+		destroy_super(s);
+		return ERR_PTR(err);
+	}
+	s->s_type = type;
+	strlcpy(s->s_id, type->name, sizeof(s->s_id));
+	list_add_tail(&s->s_list, &super_blocks);
+	hlist_add_head(&s->s_instances, &type->fs_supers);
+	spin_unlock(&sb_lock);
+	get_filesystem(type);
+	register_shrinker(&s->s_shrink);
+	return s;
+}
+
+EXPORT_SYMBOL(sget);
+
+void drop_super(struct super_block *sb)
+{
+	up_read(&sb->s_umount);
+	put_super(sb);
+}
+
+EXPORT_SYMBOL(drop_super);
+
+/**
+ * sync_supers - helper for periodic superblock writeback
+ *
+ * Call the write_super method if present on all dirty superblocks in
+ * the system.  This is for the periodic writeback used by most older
+ * filesystems.  For data integrity superblock writeback use
+ * sync_filesystems() instead.
+ *
+ * Note: check the dirty flag before waiting, so we don't
+ * hold up the sync while mounting a device. (The newly
+ * mounted device won't need syncing.)
+ */
+void sync_supers(void)
+{
+	struct super_block *sb, *p = NULL;
+
+	spin_lock(&sb_lock);
+	list_for_each_entry(sb, &super_blocks, s_list) {
+		if (hlist_unhashed(&sb->s_instances))
+			continue;
+		if (sb->s_op->write_super && sb->s_dirt) {
+			sb->s_count++;
+			spin_unlock(&sb_lock);
+
+			down_read(&sb->s_umount);
+			if (sb->s_root && sb->s_dirt && (sb->s_flags & MS_BORN))
+				sb->s_op->write_super(sb);
+			up_read(&sb->s_umount);
+
+			spin_lock(&sb_lock);
+			if (p)
+				__put_super(p);
+			p = sb;
+		}
+	}
+	if (p)
+		__put_super(p);
+	spin_unlock(&sb_lock);
+}
+
+/**
+ *	iterate_supers - call function for all active superblocks
+ *	@f: function to call
+ *	@arg: argument to pass to it
+ *
+ *	Scans the superblock list and calls given function, passing it
+ *	locked superblock and given argument.
+ */
+void iterate_supers(void (*f)(struct super_block *, void *), void *arg)
+{
+	struct super_block *sb, *p = NULL;
+
+	spin_lock(&sb_lock);
+	list_for_each_entry(sb, &super_blocks, s_list) {
+		if (hlist_unhashed(&sb->s_instances))
+			continue;
+		sb->s_count++;
+		spin_unlock(&sb_lock);
+
+		down_read(&sb->s_umount);
+		if (sb->s_root && (sb->s_flags & MS_BORN))
+			f(sb, arg);
+		up_read(&sb->s_umount);
+
+		spin_lock(&sb_lock);
+		if (p)
+			__put_super(p);
+		p = sb;
+	}
+	if (p)
+		__put_super(p);
+	spin_unlock(&sb_lock);
+}
+
+/**
+ *	iterate_supers_type - call function for superblocks of given type
+ *	@type: fs type
+ *	@f: function to call
+ *	@arg: argument to pass to it
+ *
+ *	Scans the superblock list and calls given function, passing it
+ *	locked superblock and given argument.
+ */
+void iterate_supers_type(struct file_system_type *type,
+	void (*f)(struct super_block *, void *), void *arg)
+{
+	struct super_block *sb, *p = NULL;
+	struct hlist_node *node;
+
+	spin_lock(&sb_lock);
+	hlist_for_each_entry(sb, node, &type->fs_supers, s_instances) {
+		sb->s_count++;
+		spin_unlock(&sb_lock);
+
+		down_read(&sb->s_umount);
+		if (sb->s_root && (sb->s_flags & MS_BORN))
+			f(sb, arg);
+		up_read(&sb->s_umount);
+
+		spin_lock(&sb_lock);
+		if (p)
+			__put_super(p);
+		p = sb;
+	}
+	if (p)
+		__put_super(p);
+	spin_unlock(&sb_lock);
+}
+
+EXPORT_SYMBOL(iterate_supers_type);
+
+/**
+ *	get_super - get the superblock of a device
+ *	@bdev: device to get the superblock for
+ *	
+ *	Scans the superblock list and finds the superblock of the file system
+ *	mounted on the device given. %NULL is returned if no match is found.
+ */
+
+struct super_block *get_super(struct block_device *bdev)
+{
+	struct super_block *sb;
+
+	if (!bdev)
+		return NULL;
+
+	spin_lock(&sb_lock);
+rescan:
+	list_for_each_entry(sb, &super_blocks, s_list) {
+		if (hlist_unhashed(&sb->s_instances))
+			continue;
+		if (sb->s_bdev == bdev) {
+			sb->s_count++;
+			spin_unlock(&sb_lock);
+			down_read(&sb->s_umount);
+			/* still alive? */
+			if (sb->s_root && (sb->s_flags & MS_BORN))
+				return sb;
+			up_read(&sb->s_umount);
+			/* nope, got unmounted */
+			spin_lock(&sb_lock);
+			__put_super(sb);
+			goto rescan;
+		}
+	}
+	spin_unlock(&sb_lock);
+	return NULL;
+}
+
+EXPORT_SYMBOL(get_super);
+
+/**
+ *	get_super_thawed - get thawed superblock of a device
+ *	@bdev: device to get the superblock for
+ *
+ *	Scans the superblock list and finds the superblock of the file system
+ *	mounted on the device. The superblock is returned once it is thawed
+ *	(or immediately if it was not frozen). %NULL is returned if no match
+ *	is found.
+ */
+struct super_block *get_super_thawed(struct block_device *bdev)
+{
+	while (1) {
+		struct super_block *s = get_super(bdev);
+		if (!s || s->s_frozen == SB_UNFROZEN)
+			return s;
+		up_read(&s->s_umount);
+		vfs_check_frozen(s, SB_FREEZE_WRITE);
+		put_super(s);
+	}
+}
+EXPORT_SYMBOL(get_super_thawed);
+
+/**
+ * get_active_super - get an active reference to the superblock of a device
+ * @bdev: device to get the superblock for
+ *
+ * Scans the superblock list and finds the superblock of the file system
+ * mounted on the device given.  Returns the superblock with an active
+ * reference or %NULL if none was found.
+ */
+struct super_block *get_active_super(struct block_device *bdev)
+{
+	struct super_block *sb;
+
+	if (!bdev)
+		return NULL;
+
+restart:
+	spin_lock(&sb_lock);
+	list_for_each_entry(sb, &super_blocks, s_list) {
+		if (hlist_unhashed(&sb->s_instances))
+			continue;
+		if (sb->s_bdev == bdev) {
+			if (grab_super(sb)) /* drops sb_lock */
+				return sb;
+			else
+				goto restart;
+		}
+	}
+	spin_unlock(&sb_lock);
+	return NULL;
+}
+ 
+struct super_block *user_get_super(dev_t dev)
+{
+	struct super_block *sb;
+
+	spin_lock(&sb_lock);
+rescan:
+	list_for_each_entry(sb, &super_blocks, s_list) {
+		if (hlist_unhashed(&sb->s_instances))
+			continue;
+		if (sb->s_dev ==  dev) {
+			sb->s_count++;
+			spin_unlock(&sb_lock);
+			down_read(&sb->s_umount);
+			/* still alive? */
+			if (sb->s_root && (sb->s_flags & MS_BORN))
+				return sb;
+			up_read(&sb->s_umount);
+			/* nope, got unmounted */
+			spin_lock(&sb_lock);
+			__put_super(sb);
+			goto rescan;
+		}
+	}
+	spin_unlock(&sb_lock);
+	return NULL;
+}
+
+/**
+ *	do_remount_sb - asks filesystem to change mount options.
+ *	@sb:	superblock in question
+ *	@flags:	numeric part of options
+ *	@data:	the rest of options
+ *      @force: whether or not to force the change
+ *
+ *	Alters the mount options of a mounted file system.
+ */
+int do_remount_sb(struct super_block *sb, int flags, void *data, int force)
+{
+	int retval;
+	int remount_ro;
+
+	if (sb->s_frozen != SB_UNFROZEN)
+		return -EBUSY;
+
+#ifdef CONFIG_BLOCK
+	if (!(flags & MS_RDONLY) && bdev_read_only(sb->s_bdev))
+		return -EACCES;
+#endif
+
+	if (flags & MS_RDONLY)
+		acct_auto_close(sb);
+	shrink_dcache_sb(sb);
+	sync_filesystem(sb);
+
+	remount_ro = (flags & MS_RDONLY) && !(sb->s_flags & MS_RDONLY);
+
+	/* If we are remounting RDONLY and current sb is read/write,
+	   make sure there are no rw files opened */
+	if (remount_ro) {
+		if (force) {
+			mark_files_ro(sb);
+		} else {
+			retval = sb_prepare_remount_readonly(sb);
+			if (retval)
+				return retval;
+		}
+	}
+
+	if (sb->s_op->remount_fs) {
+		retval = sb->s_op->remount_fs(sb, &flags, data);
+		if (retval) {
+			if (!force)
+				goto cancel_readonly;
+			/* If forced remount, go ahead despite any errors */
+			WARN(1, "forced remount of a %s fs returned %i\n",
+			     sb->s_type->name, retval);
+		}
+	}
+	sb->s_flags = (sb->s_flags & ~MS_RMT_MASK) | (flags & MS_RMT_MASK);
+	/* Needs to be ordered wrt mnt_is_readonly() */
+	smp_wmb();
+	sb->s_readonly_remount = 0;
+
+	/*
+	 * Some filesystems modify their metadata via some other path than the
+	 * bdev buffer cache (eg. use a private mapping, or directories in
+	 * pagecache, etc). Also file data modifications go via their own
+	 * mappings. So If we try to mount readonly then copy the filesystem
+	 * from bdev, we could get stale data, so invalidate it to give a best
+	 * effort at coherency.
+	 */
+	if (remount_ro && sb->s_bdev)
+		invalidate_bdev(sb->s_bdev);
+	return 0;
+
+cancel_readonly:
+	sb->s_readonly_remount = 0;
+	return retval;
+}
+
+static void do_emergency_remount(struct work_struct *work)
+{
+	struct super_block *sb, *p = NULL;
+
+	spin_lock(&sb_lock);
+	list_for_each_entry(sb, &super_blocks, s_list) {
+		if (hlist_unhashed(&sb->s_instances))
+			continue;
+		sb->s_count++;
+		spin_unlock(&sb_lock);
+		down_write(&sb->s_umount);
+		if (sb->s_root && sb->s_bdev && (sb->s_flags & MS_BORN) &&
+		    !(sb->s_flags & MS_RDONLY)) {
+			/*
+			 * What lock protects sb->s_flags??
+			 */
+			do_remount_sb(sb, MS_RDONLY, NULL, 1);
+		}
+		up_write(&sb->s_umount);
+		spin_lock(&sb_lock);
+		if (p)
+			__put_super(p);
+		p = sb;
+	}
+	if (p)
+		__put_super(p);
+	spin_unlock(&sb_lock);
+	kfree(work);
+	printk("Emergency Remount complete\n");
+}
+
+void emergency_remount(void)
+{
+	struct work_struct *work;
+
+	work = kmalloc(sizeof(*work), GFP_ATOMIC);
+	if (work) {
+		INIT_WORK(work, do_emergency_remount);
+		schedule_work(work);
+	}
+}
+
+/*
+ * Unnamed block devices are dummy devices used by virtual
+ * filesystems which don't use real block-devices.  -- jrs
+ */
+
+static DEFINE_IDA(unnamed_dev_ida);
+static DEFINE_SPINLOCK(unnamed_dev_lock);/* protects the above */
+static int unnamed_dev_start = 0; /* don't bother trying below it */
+
+int get_anon_bdev(dev_t *p)
+{
+	int dev;
+	int error;
+
+ retry:
+	if (ida_pre_get(&unnamed_dev_ida, GFP_ATOMIC) == 0)
+		return -ENOMEM;
+	spin_lock(&unnamed_dev_lock);
+	error = ida_get_new_above(&unnamed_dev_ida, unnamed_dev_start, &dev);
+	if (!error)
+		unnamed_dev_start = dev + 1;
+	spin_unlock(&unnamed_dev_lock);
+	if (error == -EAGAIN)
+		/* We raced and lost with another CPU. */
+		goto retry;
+	else if (error)
+		return -EAGAIN;
+
+	if ((dev & MAX_ID_MASK) == (1 << MINORBITS)) {
+		spin_lock(&unnamed_dev_lock);
+		ida_remove(&unnamed_dev_ida, dev);
+		if (unnamed_dev_start > dev)
+			unnamed_dev_start = dev;
+		spin_unlock(&unnamed_dev_lock);
+		return -EMFILE;
+	}
+	*p = MKDEV(0, dev & MINORMASK);
+	return 0;
+}
+EXPORT_SYMBOL(get_anon_bdev);
+
+void free_anon_bdev(dev_t dev)
+{
+	int slot = MINOR(dev);
+	spin_lock(&unnamed_dev_lock);
+	ida_remove(&unnamed_dev_ida, slot);
+	if (slot < unnamed_dev_start)
+		unnamed_dev_start = slot;
+	spin_unlock(&unnamed_dev_lock);
+}
+EXPORT_SYMBOL(free_anon_bdev);
+
+int set_anon_super(struct super_block *s, void *data)
+{
+	int error = get_anon_bdev(&s->s_dev);
+	if (!error)
+		s->s_bdi = &noop_backing_dev_info;
+	return error;
+}
+
+EXPORT_SYMBOL(set_anon_super);
+
+void kill_anon_super(struct super_block *sb)
+{
+	dev_t dev = sb->s_dev;
+	generic_shutdown_super(sb);
+	free_anon_bdev(dev);
+}
+
+EXPORT_SYMBOL(kill_anon_super);
+
+void kill_litter_super(struct super_block *sb)
+{
+	if (sb->s_root)
+		d_genocide(sb->s_root);
+	kill_anon_super(sb);
+}
+
+EXPORT_SYMBOL(kill_litter_super);
+
+static int ns_test_super(struct super_block *sb, void *data)
+{
+	return sb->s_fs_info == data;
+}
+
+static int ns_set_super(struct super_block *sb, void *data)
+{
+	sb->s_fs_info = data;
+	return set_anon_super(sb, NULL);
+}
+
+struct dentry *mount_ns(struct file_system_type *fs_type, int flags,
+	void *data, int (*fill_super)(struct super_block *, void *, int))
+{
+	struct super_block *sb;
+
+	sb = sget(fs_type, ns_test_super, ns_set_super, data);
+	if (IS_ERR(sb))
+		return ERR_CAST(sb);
+
+	if (!sb->s_root) {
+		int err;
+		sb->s_flags = flags;
+		err = fill_super(sb, data, flags & MS_SILENT ? 1 : 0);
+		if (err) {
+			deactivate_locked_super(sb);
+			return ERR_PTR(err);
+		}
+
+		sb->s_flags |= MS_ACTIVE;
+	}
+
+	return dget(sb->s_root);
+}
+
+EXPORT_SYMBOL(mount_ns);
+
+#ifdef CONFIG_BLOCK
+static int set_bdev_super(struct super_block *s, void *data)
+{
+	s->s_bdev = data;
+	s->s_dev = s->s_bdev->bd_dev;
+
+	/*
+	 * We set the bdi here to the queue backing, file systems can
+	 * overwrite this in ->fill_super()
+	 */
+	s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info;
+	return 0;
+}
+
+static int test_bdev_super(struct super_block *s, void *data)
+{
+	return (void *)s->s_bdev == data;
+}
+
+struct dentry *mount_bdev(struct file_system_type *fs_type,
+	int flags, const char *dev_name, void *data,
+	int (*fill_super)(struct super_block *, void *, int))
+{
+	struct block_device *bdev;
+	struct super_block *s;
+	fmode_t mode = FMODE_READ | FMODE_EXCL;
+	int error = 0;
+
+	if (!(flags & MS_RDONLY))
+		mode |= FMODE_WRITE;
+
+	bdev = blkdev_get_by_path(dev_name, mode, fs_type);
+	if (IS_ERR(bdev))
+		return ERR_CAST(bdev);
+
+	/*
+	 * once the super is inserted into the list by sget, s_umount
+	 * will protect the lockfs code from trying to start a snapshot
+	 * while we are mounting
+	 */
+	mutex_lock(&bdev->bd_fsfreeze_mutex);
+	if (bdev->bd_fsfreeze_count > 0) {
+		mutex_unlock(&bdev->bd_fsfreeze_mutex);
+		error = -EBUSY;
+		goto error_bdev;
+	}
+	s = sget(fs_type, test_bdev_super, set_bdev_super, bdev);
+	mutex_unlock(&bdev->bd_fsfreeze_mutex);
+	if (IS_ERR(s))
+		goto error_s;
+
+	if (s->s_root) {
+		if ((flags ^ s->s_flags) & MS_RDONLY) {
+			deactivate_locked_super(s);
+			error = -EBUSY;
+			goto error_bdev;
+		}
+
+		/*
+		 * s_umount nests inside bd_mutex during
+		 * __invalidate_device().  blkdev_put() acquires
+		 * bd_mutex and can't be called under s_umount.  Drop
+		 * s_umount temporarily.  This is safe as we're
+		 * holding an active reference.
+		 */
+		up_write(&s->s_umount);
+		blkdev_put(bdev, mode);
+		down_write(&s->s_umount);
+	} else {
+		char b[BDEVNAME_SIZE];
+
+		s->s_flags = flags | MS_NOSEC;
+		s->s_mode = mode;
+		strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
+		sb_set_blocksize(s, block_size(bdev));
+		error = fill_super(s, data, flags & MS_SILENT ? 1 : 0);
+		if (error) {
+			deactivate_locked_super(s);
+			goto error;
+		}
+
+		s->s_flags |= MS_ACTIVE;
+		bdev->bd_super = s;
+	}
+
+	return dget(s->s_root);
+
+error_s:
+	error = PTR_ERR(s);
+error_bdev:
+	blkdev_put(bdev, mode);
+error:
+	return ERR_PTR(error);
+}
+EXPORT_SYMBOL(mount_bdev);
+
+void kill_block_super(struct super_block *sb)
+{
+	struct block_device *bdev = sb->s_bdev;
+	fmode_t mode = sb->s_mode;
+
+	bdev->bd_super = NULL;
+	generic_shutdown_super(sb);
+	sync_blockdev(bdev);
+	WARN_ON_ONCE(!(mode & FMODE_EXCL));
+	blkdev_put(bdev, mode | FMODE_EXCL);
+}
+
+EXPORT_SYMBOL(kill_block_super);
+#endif
+
+struct dentry *mount_nodev(struct file_system_type *fs_type,
+	int flags, void *data,
+	int (*fill_super)(struct super_block *, void *, int))
+{
+	int error;
+	struct super_block *s = sget(fs_type, NULL, set_anon_super, NULL);
+
+	if (IS_ERR(s))
+		return ERR_CAST(s);
+
+	s->s_flags = flags;
+
+	error = fill_super(s, data, flags & MS_SILENT ? 1 : 0);
+	if (error) {
+		deactivate_locked_super(s);
+		return ERR_PTR(error);
+	}
+	s->s_flags |= MS_ACTIVE;
+	return dget(s->s_root);
+}
+EXPORT_SYMBOL(mount_nodev);
+
+static int compare_single(struct super_block *s, void *p)
+{
+	return 1;
+}
+
+struct dentry *mount_single(struct file_system_type *fs_type,
+	int flags, void *data,
+	int (*fill_super)(struct super_block *, void *, int))
+{
+	struct super_block *s;
+	int error;
+
+	s = sget(fs_type, compare_single, set_anon_super, NULL);
+	if (IS_ERR(s))
+		return ERR_CAST(s);
+	if (!s->s_root) {
+		s->s_flags = flags;
+		error = fill_super(s, data, flags & MS_SILENT ? 1 : 0);
+		if (error) {
+			deactivate_locked_super(s);
+			return ERR_PTR(error);
+		}
+		s->s_flags |= MS_ACTIVE;
+	} else {
+		do_remount_sb(s, flags, data, 0);
+	}
+	return dget(s->s_root);
+}
+EXPORT_SYMBOL(mount_single);
+
+struct dentry *
+mount_fs(struct file_system_type *type, int flags, const char *name, void *data)
+{
+	struct dentry *root;
+	struct super_block *sb;
+	char *secdata = NULL;
+	int error = -ENOMEM;
+
+	if (data && !(type->fs_flags & FS_BINARY_MOUNTDATA)) {
+		secdata = alloc_secdata();
+		if (!secdata)
+			goto out;
+
+		error = security_sb_copy_data(data, secdata);
+		if (error)
+			goto out_free_secdata;
+	}
+
+	root = type->mount(type, flags, name, data);
+	if (IS_ERR(root)) {
+		error = PTR_ERR(root);
+		goto out_free_secdata;
+	}
+	sb = root->d_sb;
+	BUG_ON(!sb);
+	WARN_ON(!sb->s_bdi);
+	WARN_ON(sb->s_bdi == &default_backing_dev_info);
+	sb->s_flags |= MS_BORN;
+
+	error = security_sb_kern_mount(sb, flags, secdata);
+	if (error)
+		goto out_sb;
+
+	/*
+	 * filesystems should never set s_maxbytes larger than MAX_LFS_FILESIZE
+	 * but s_maxbytes was an unsigned long long for many releases. Throw
+	 * this warning for a little while to try and catch filesystems that
+	 * violate this rule.
+	 */
+	WARN((sb->s_maxbytes < 0), "%s set sb->s_maxbytes to "
+		"negative value (%lld)\n", type->name, sb->s_maxbytes);
+
+	up_write(&sb->s_umount);
+	free_secdata(secdata);
+	return root;
+out_sb:
+	dput(root);
+	deactivate_locked_super(sb);
+out_free_secdata:
+	free_secdata(secdata);
+out:
+	return ERR_PTR(error);
+}
+
+/**
+ * freeze_super - lock the filesystem and force it into a consistent state
+ * @sb: the super to lock
+ *
+ * Syncs the super to make sure the filesystem is consistent and calls the fs's
+ * freeze_fs.  Subsequent calls to this without first thawing the fs will return
+ * -EBUSY.
+ */
+int freeze_super(struct super_block *sb)
+{
+	int ret;
+
+	atomic_inc(&sb->s_active);
+	down_write(&sb->s_umount);
+	if (sb->s_frozen) {
+		deactivate_locked_super(sb);
+		return -EBUSY;
+	}
+
+	if (!(sb->s_flags & MS_BORN)) {
+		up_write(&sb->s_umount);
+		return 0;	/* sic - it's "nothing to do" */
+	}
+
+	if (sb->s_flags & MS_RDONLY) {
+		sb->s_frozen = SB_FREEZE_TRANS;
+		smp_wmb();
+		up_write(&sb->s_umount);
+		return 0;
+	}
+
+	sb->s_frozen = SB_FREEZE_WRITE;
+	smp_wmb();
+
+	sync_filesystem(sb);
+
+	sb->s_frozen = SB_FREEZE_TRANS;
+	smp_wmb();
+
+	sync_blockdev(sb->s_bdev);
+	if (sb->s_op->freeze_fs) {
+		ret = sb->s_op->freeze_fs(sb);
+		if (ret) {
+			printk(KERN_ERR
+				"VFS:Filesystem freeze failed\n");
+			sb->s_frozen = SB_UNFROZEN;
+			smp_wmb();
+			wake_up(&sb->s_wait_unfrozen);
+			deactivate_locked_super(sb);
+			return ret;
+		}
+	}
+	up_write(&sb->s_umount);
+	return 0;
+}
+EXPORT_SYMBOL(freeze_super);
+
+/**
+ * thaw_super -- unlock filesystem
+ * @sb: the super to thaw
+ *
+ * Unlocks the filesystem and marks it writeable again after freeze_super().
+ */
+int thaw_super(struct super_block *sb)
+{
+	int error;
+
+	down_write(&sb->s_umount);
+	if (sb->s_frozen == SB_UNFROZEN) {
+		up_write(&sb->s_umount);
+		return -EINVAL;
+	}
+
+	if (sb->s_flags & MS_RDONLY)
+		goto out;
+
+	if (sb->s_op->unfreeze_fs) {
+		error = sb->s_op->unfreeze_fs(sb);
+		if (error) {
+			printk(KERN_ERR
+				"VFS:Filesystem thaw failed\n");
+			sb->s_frozen = SB_FREEZE_TRANS;
+			up_write(&sb->s_umount);
+			return error;
+		}
+	}
+
+out:
+	sb->s_frozen = SB_UNFROZEN;
+	smp_wmb();
+	wake_up(&sb->s_wait_unfrozen);
+	deactivate_locked_super(sb);
+
+	return 0;
+}
+EXPORT_SYMBOL(thaw_super);