Moved, renamed, and deleted files

The original directory structure was scattered and unorganized.
Changes are basically to make it look like kernel structure.

1 files changed, 0 insertions, 1143 deletions

diff --git a/ANDROID_3.4.5/fs/open.c b/ANDROID_3.4.5/fs/open.c
deleted file mode 100644
index 3f1108b1..00000000
--- a/ANDROID_3.4.5/fs/open.c
+++ /dev/null
@@ -1,1143 +0,0 @@
-/*
- *  linux/fs/open.c
- *
- *  Copyright (C) 1991, 1992  Linus Torvalds
- */
-
-#include <linux/string.h>
-#include <linux/mm.h>
-#include <linux/file.h>
-#include <linux/fdtable.h>
-#include <linux/fsnotify.h>
-#include <linux/module.h>
-#include <linux/tty.h>
-#include <linux/namei.h>
-#include <linux/backing-dev.h>
-#include <linux/capability.h>
-#include <linux/securebits.h>
-#include <linux/security.h>
-#include <linux/mount.h>
-#include <linux/fcntl.h>
-#include <linux/slab.h>
-#include <asm/uaccess.h>
-#include <linux/fs.h>
-#include <linux/personality.h>
-#include <linux/pagemap.h>
-#include <linux/syscalls.h>
-#include <linux/rcupdate.h>
-#include <linux/audit.h>
-#include <linux/falloc.h>
-#include <linux/fs_struct.h>
-#include <linux/ima.h>
-#include <linux/dnotify.h>
-
-#include "internal.h"
-
-int do_truncate(struct dentry *dentry, loff_t length, unsigned int time_attrs,
-	struct file *filp)
-{
-	int ret;
-	struct iattr newattrs;
-
-	/* Not pretty: "inode->i_size" shouldn't really be signed. But it is. */
-	if (length < 0)
-		return -EINVAL;
-
-	newattrs.ia_size = length;
-	newattrs.ia_valid = ATTR_SIZE | time_attrs;
-	if (filp) {
-		newattrs.ia_file = filp;
-		newattrs.ia_valid |= ATTR_FILE;
-	}
-
-	/* Remove suid/sgid on truncate too */
-	ret = should_remove_suid(dentry);
-	if (ret)
-		newattrs.ia_valid |= ret | ATTR_FORCE;
-
-	mutex_lock(&dentry->d_inode->i_mutex);
-	ret = notify_change(dentry, &newattrs);
-	mutex_unlock(&dentry->d_inode->i_mutex);
-	return ret;
-}
-
-static long do_sys_truncate(const char __user *pathname, loff_t length)
-{
-	struct path path;
-	struct inode *inode;
-	int error;
-
-	error = -EINVAL;
-	if (length < 0)	/* sorry, but loff_t says... */
-		goto out;
-
-	error = user_path(pathname, &path);
-	if (error)
-		goto out;
-	inode = path.dentry->d_inode;
-
-	/* For directories it's -EISDIR, for other non-regulars - -EINVAL */
-	error = -EISDIR;
-	if (S_ISDIR(inode->i_mode))
-		goto dput_and_out;
-
-	error = -EINVAL;
-	if (!S_ISREG(inode->i_mode))
-		goto dput_and_out;
-
-	error = mnt_want_write(path.mnt);
-	if (error)
-		goto dput_and_out;
-
-	error = inode_permission(inode, MAY_WRITE);
-	if (error)
-		goto mnt_drop_write_and_out;
-
-	error = -EPERM;
-	if (IS_APPEND(inode))
-		goto mnt_drop_write_and_out;
-
-	error = get_write_access(inode);
-	if (error)
-		goto mnt_drop_write_and_out;
-
-	/*
-	 * Make sure that there are no leases.  get_write_access() protects
-	 * against the truncate racing with a lease-granting setlease().
-	 */
-	error = break_lease(inode, O_WRONLY);
-	if (error)
-		goto put_write_and_out;
-
-	error = locks_verify_truncate(inode, NULL, length);
-	if (!error)
-		error = security_path_truncate(&path);
-	if (!error)
-		error = do_truncate(path.dentry, length, 0, NULL);
-
-put_write_and_out:
-	put_write_access(inode);
-mnt_drop_write_and_out:
-	mnt_drop_write(path.mnt);
-dput_and_out:
-	path_put(&path);
-out:
-	return error;
-}
-
-SYSCALL_DEFINE2(truncate, const char __user *, path, long, length)
-{
-	return do_sys_truncate(path, length);
-}
-
-static long do_sys_ftruncate(unsigned int fd, loff_t length, int small)
-{
-	struct inode * inode;
-	struct dentry *dentry;
-	struct file * file;
-	int error;
-
-	error = -EINVAL;
-	if (length < 0)
-		goto out;
-	error = -EBADF;
-	file = fget(fd);
-	if (!file)
-		goto out;
-
-	/* explicitly opened as large or we are on 64-bit box */
-	if (file->f_flags & O_LARGEFILE)
-		small = 0;
-
-	dentry = file->f_path.dentry;
-	inode = dentry->d_inode;
-	error = -EINVAL;
-	if (!S_ISREG(inode->i_mode) || !(file->f_mode & FMODE_WRITE))
-		goto out_putf;
-
-	error = -EINVAL;
-	/* Cannot ftruncate over 2^31 bytes without large file support */
-	if (small && length > MAX_NON_LFS)
-		goto out_putf;
-
-	error = -EPERM;
-	if (IS_APPEND(inode))
-		goto out_putf;
-
-	error = locks_verify_truncate(inode, file, length);
-	if (!error)
-		error = security_path_truncate(&file->f_path);
-	if (!error)
-		error = do_truncate(dentry, length, ATTR_MTIME|ATTR_CTIME, file);
-out_putf:
-	fput(file);
-out:
-	return error;
-}
-
-SYSCALL_DEFINE2(ftruncate, unsigned int, fd, unsigned long, length)
-{
-	long ret = do_sys_ftruncate(fd, length, 1);
-	/* avoid REGPARM breakage on x86: */
-	asmlinkage_protect(2, ret, fd, length);
-	return ret;
-}
-
-/* LFS versions of truncate are only needed on 32 bit machines */
-#if BITS_PER_LONG == 32
-SYSCALL_DEFINE(truncate64)(const char __user * path, loff_t length)
-{
-	return do_sys_truncate(path, length);
-}
-#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
-asmlinkage long SyS_truncate64(long path, loff_t length)
-{
-	return SYSC_truncate64((const char __user *) path, length);
-}
-SYSCALL_ALIAS(sys_truncate64, SyS_truncate64);
-#endif
-
-SYSCALL_DEFINE(ftruncate64)(unsigned int fd, loff_t length)
-{
-	long ret = do_sys_ftruncate(fd, length, 0);
-	/* avoid REGPARM breakage on x86: */
-	asmlinkage_protect(2, ret, fd, length);
-	return ret;
-}
-#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
-asmlinkage long SyS_ftruncate64(long fd, loff_t length)
-{
-	return SYSC_ftruncate64((unsigned int) fd, length);
-}
-SYSCALL_ALIAS(sys_ftruncate64, SyS_ftruncate64);
-#endif
-#endif /* BITS_PER_LONG == 32 */
-
-
-int do_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
-{
-	struct inode *inode = file->f_path.dentry->d_inode;
-	long ret;
-
-	if (offset < 0 || len <= 0)
-		return -EINVAL;
-
-	/* Return error if mode is not supported */
-	if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
-		return -EOPNOTSUPP;
-
-	/* Punch hole must have keep size set */
-	if ((mode & FALLOC_FL_PUNCH_HOLE) &&
-	    !(mode & FALLOC_FL_KEEP_SIZE))
-		return -EOPNOTSUPP;
-
-	if (!(file->f_mode & FMODE_WRITE))
-		return -EBADF;
-
-	/* It's not possible punch hole on append only file */
-	if (mode & FALLOC_FL_PUNCH_HOLE && IS_APPEND(inode))
-		return -EPERM;
-
-	if (IS_IMMUTABLE(inode))
-		return -EPERM;
-
-	/*
-	 * Revalidate the write permissions, in case security policy has
-	 * changed since the files were opened.
-	 */
-	ret = security_file_permission(file, MAY_WRITE);
-	if (ret)
-		return ret;
-
-	if (S_ISFIFO(inode->i_mode))
-		return -ESPIPE;
-
-	/*
-	 * Let individual file system decide if it supports preallocation
-	 * for directories or not.
-	 */
-	if (!S_ISREG(inode->i_mode) && !S_ISDIR(inode->i_mode))
-		return -ENODEV;
-
-	/* Check for wrap through zero too */
-	if (((offset + len) > inode->i_sb->s_maxbytes) || ((offset + len) < 0))
-		return -EFBIG;
-
-	if (!file->f_op->fallocate)
-		return -EOPNOTSUPP;
-
-	return file->f_op->fallocate(file, mode, offset, len);
-}
-
-SYSCALL_DEFINE(fallocate)(int fd, int mode, loff_t offset, loff_t len)
-{
-	struct file *file;
-	int error = -EBADF;
-
-	file = fget(fd);
-	if (file) {
-		error = do_fallocate(file, mode, offset, len);
-		fput(file);
-	}
-
-	return error;
-}
-
-#ifdef CONFIG_HAVE_SYSCALL_WRAPPERS
-asmlinkage long SyS_fallocate(long fd, long mode, loff_t offset, loff_t len)
-{
-	return SYSC_fallocate((int)fd, (int)mode, offset, len);
-}
-SYSCALL_ALIAS(sys_fallocate, SyS_fallocate);
-#endif
-
-/*
- * access() needs to use the real uid/gid, not the effective uid/gid.
- * We do this by temporarily clearing all FS-related capabilities and
- * switching the fsuid/fsgid around to the real ones.
- */
-SYSCALL_DEFINE3(faccessat, int, dfd, const char __user *, filename, int, mode)
-{
-	const struct cred *old_cred;
-	struct cred *override_cred;
-	struct path path;
-	struct inode *inode;
-	int res;
-
-	if (mode & ~S_IRWXO)	/* where's F_OK, X_OK, W_OK, R_OK? */
-		return -EINVAL;
-
-	override_cred = prepare_creds();
-	if (!override_cred)
-		return -ENOMEM;
-
-	override_cred->fsuid = override_cred->uid;
-	override_cred->fsgid = override_cred->gid;
-
-	if (!issecure(SECURE_NO_SETUID_FIXUP)) {
-		/* Clear the capabilities if we switch to a non-root user */
-		if (override_cred->uid)
-			cap_clear(override_cred->cap_effective);
-		else
-			override_cred->cap_effective =
-				override_cred->cap_permitted;
-	}
-
-	old_cred = override_creds(override_cred);
-
-	res = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
-	if (res)
-		goto out;
-
-	inode = path.dentry->d_inode;
-
-	if ((mode & MAY_EXEC) && S_ISREG(inode->i_mode)) {
-		/*
-		 * MAY_EXEC on regular files is denied if the fs is mounted
-		 * with the "noexec" flag.
-		 */
-		res = -EACCES;
-		if (path.mnt->mnt_flags & MNT_NOEXEC)
-			goto out_path_release;
-	}
-
-	res = inode_permission(inode, mode | MAY_ACCESS);
-	/* SuS v2 requires we report a read only fs too */
-	if (res || !(mode & S_IWOTH) || special_file(inode->i_mode))
-		goto out_path_release;
-	/*
-	 * This is a rare case where using __mnt_is_readonly()
-	 * is OK without a mnt_want/drop_write() pair.  Since
-	 * no actual write to the fs is performed here, we do
-	 * not need to telegraph to that to anyone.
-	 *
-	 * By doing this, we accept that this access is
-	 * inherently racy and know that the fs may change
-	 * state before we even see this result.
-	 */
-	if (__mnt_is_readonly(path.mnt))
-		res = -EROFS;
-
-out_path_release:
-	path_put(&path);
-out:
-	revert_creds(old_cred);
-	put_cred(override_cred);
-	return res;
-}
-
-SYSCALL_DEFINE2(access, const char __user *, filename, int, mode)
-{
-	return sys_faccessat(AT_FDCWD, filename, mode);
-}
-
-SYSCALL_DEFINE1(chdir, const char __user *, filename)
-{
-	struct path path;
-	int error;
-
-	error = user_path_dir(filename, &path);
-	if (error)
-		goto out;
-
-	error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
-	if (error)
-		goto dput_and_out;
-
-	set_fs_pwd(current->fs, &path);
-
-dput_and_out:
-	path_put(&path);
-out:
-	return error;
-}
-
-SYSCALL_DEFINE1(fchdir, unsigned int, fd)
-{
-	struct file *file;
-	struct inode *inode;
-	int error, fput_needed;
-
-	error = -EBADF;
-	file = fget_raw_light(fd, &fput_needed);
-	if (!file)
-		goto out;
-
-	inode = file->f_path.dentry->d_inode;
-
-	error = -ENOTDIR;
-	if (!S_ISDIR(inode->i_mode))
-		goto out_putf;
-
-	error = inode_permission(inode, MAY_EXEC | MAY_CHDIR);
-	if (!error)
-		set_fs_pwd(current->fs, &file->f_path);
-out_putf:
-	fput_light(file, fput_needed);
-out:
-	return error;
-}
-
-SYSCALL_DEFINE1(chroot, const char __user *, filename)
-{
-	struct path path;
-	int error;
-
-	error = user_path_dir(filename, &path);
-	if (error)
-		goto out;
-
-	error = inode_permission(path.dentry->d_inode, MAY_EXEC | MAY_CHDIR);
-	if (error)
-		goto dput_and_out;
-
-	error = -EPERM;
-	if (!capable(CAP_SYS_CHROOT))
-		goto dput_and_out;
-	error = security_path_chroot(&path);
-	if (error)
-		goto dput_and_out;
-
-	set_fs_root(current->fs, &path);
-	error = 0;
-dput_and_out:
-	path_put(&path);
-out:
-	return error;
-}
-
-static int chmod_common(struct path *path, umode_t mode)
-{
-	struct inode *inode = path->dentry->d_inode;
-	struct iattr newattrs;
-	int error;
-
-	error = mnt_want_write(path->mnt);
-	if (error)
-		return error;
-	mutex_lock(&inode->i_mutex);
-	error = security_path_chmod(path, mode);
-	if (error)
-		goto out_unlock;
-	newattrs.ia_mode = (mode & S_IALLUGO) | (inode->i_mode & ~S_IALLUGO);
-	newattrs.ia_valid = ATTR_MODE | ATTR_CTIME;
-	error = notify_change(path->dentry, &newattrs);
-out_unlock:
-	mutex_unlock(&inode->i_mutex);
-	mnt_drop_write(path->mnt);
-	return error;
-}
-
-SYSCALL_DEFINE2(fchmod, unsigned int, fd, umode_t, mode)
-{
-	struct file * file;
-	int err = -EBADF;
-
-	file = fget(fd);
-	if (file) {
-		audit_inode(NULL, file->f_path.dentry);
-		err = chmod_common(&file->f_path, mode);
-		fput(file);
-	}
-	return err;
-}
-
-SYSCALL_DEFINE3(fchmodat, int, dfd, const char __user *, filename, umode_t, mode)
-{
-	struct path path;
-	int error;
-
-	error = user_path_at(dfd, filename, LOOKUP_FOLLOW, &path);
-	if (!error) {
-		error = chmod_common(&path, mode);
-		path_put(&path);
-	}
-	return error;
-}
-
-SYSCALL_DEFINE2(chmod, const char __user *, filename, umode_t, mode)
-{
-	return sys_fchmodat(AT_FDCWD, filename, mode);
-}
-
-static int chown_common(struct path *path, uid_t user, gid_t group)
-{
-	struct inode *inode = path->dentry->d_inode;
-	int error;
-	struct iattr newattrs;
-
-	newattrs.ia_valid =  ATTR_CTIME;
-	if (user != (uid_t) -1) {
-		newattrs.ia_valid |= ATTR_UID;
-		newattrs.ia_uid = user;
-	}
-	if (group != (gid_t) -1) {
-		newattrs.ia_valid |= ATTR_GID;
-		newattrs.ia_gid = group;
-	}
-	if (!S_ISDIR(inode->i_mode))
-		newattrs.ia_valid |=
-			ATTR_KILL_SUID | ATTR_KILL_SGID | ATTR_KILL_PRIV;
-	mutex_lock(&inode->i_mutex);
-	error = security_path_chown(path, user, group);
-	if (!error)
-		error = notify_change(path->dentry, &newattrs);
-	mutex_unlock(&inode->i_mutex);
-
-	return error;
-}
-
-SYSCALL_DEFINE3(chown, const char __user *, filename, uid_t, user, gid_t, group)
-{
-	struct path path;
-	int error;
-
-	error = user_path(filename, &path);
-	if (error)
-		goto out;
-	error = mnt_want_write(path.mnt);
-	if (error)
-		goto out_release;
-	error = chown_common(&path, user, group);
-	mnt_drop_write(path.mnt);
-out_release:
-	path_put(&path);
-out:
-	return error;
-}
-
-SYSCALL_DEFINE5(fchownat, int, dfd, const char __user *, filename, uid_t, user,
-		gid_t, group, int, flag)
-{
-	struct path path;
-	int error = -EINVAL;
-	int lookup_flags;
-
-	if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_EMPTY_PATH)) != 0)
-		goto out;
-
-	lookup_flags = (flag & AT_SYMLINK_NOFOLLOW) ? 0 : LOOKUP_FOLLOW;
-	if (flag & AT_EMPTY_PATH)
-		lookup_flags |= LOOKUP_EMPTY;
-	error = user_path_at(dfd, filename, lookup_flags, &path);
-	if (error)
-		goto out;
-	error = mnt_want_write(path.mnt);
-	if (error)
-		goto out_release;
-	error = chown_common(&path, user, group);
-	mnt_drop_write(path.mnt);
-out_release:
-	path_put(&path);
-out:
-	return error;
-}
-
-SYSCALL_DEFINE3(lchown, const char __user *, filename, uid_t, user, gid_t, group)
-{
-	struct path path;
-	int error;
-
-	error = user_lpath(filename, &path);
-	if (error)
-		goto out;
-	error = mnt_want_write(path.mnt);
-	if (error)
-		goto out_release;
-	error = chown_common(&path, user, group);
-	mnt_drop_write(path.mnt);
-out_release:
-	path_put(&path);
-out:
-	return error;
-}
-
-SYSCALL_DEFINE3(fchown, unsigned int, fd, uid_t, user, gid_t, group)
-{
-	struct file * file;
-	int error = -EBADF;
-	struct dentry * dentry;
-
-	file = fget(fd);
-	if (!file)
-		goto out;
-
-	error = mnt_want_write_file(file);
-	if (error)
-		goto out_fput;
-	dentry = file->f_path.dentry;
-	audit_inode(NULL, dentry);
-	error = chown_common(&file->f_path, user, group);
-	mnt_drop_write_file(file);
-out_fput:
-	fput(file);
-out:
-	return error;
-}
-
-/*
- * You have to be very careful that these write
- * counts get cleaned up in error cases and
- * upon __fput().  This should probably never
- * be called outside of __dentry_open().
- */
-static inline int __get_file_write_access(struct inode *inode,
-					  struct vfsmount *mnt)
-{
-	int error;
-	error = get_write_access(inode);
-	if (error)
-		return error;
-	/*
-	 * Do not take mount writer counts on
-	 * special files since no writes to
-	 * the mount itself will occur.
-	 */
-	if (!special_file(inode->i_mode)) {
-		/*
-		 * Balanced in __fput()
-		 */
-		error = mnt_want_write(mnt);
-		if (error)
-			put_write_access(inode);
-	}
-	return error;
-}
-
-static struct file *__dentry_open(struct dentry *dentry, struct vfsmount *mnt,
-					struct file *f,
-					int (*open)(struct inode *, struct file *),
-					const struct cred *cred)
-{
-	static const struct file_operations empty_fops = {};
-	struct inode *inode;
-	int error;
-
-	f->f_mode = OPEN_FMODE(f->f_flags) | FMODE_LSEEK |
-				FMODE_PREAD | FMODE_PWRITE;
-
-	if (unlikely(f->f_flags & O_PATH))
-		f->f_mode = FMODE_PATH;
-
-	inode = dentry->d_inode;
-	if (f->f_mode & FMODE_WRITE) {
-		error = __get_file_write_access(inode, mnt);
-		if (error)
-			goto cleanup_file;
-		if (!special_file(inode->i_mode))
-			file_take_write(f);
-	}
-
-	f->f_mapping = inode->i_mapping;
-	f->f_path.dentry = dentry;
-	f->f_path.mnt = mnt;
-	f->f_pos = 0;
-	file_sb_list_add(f, inode->i_sb);
-
-	if (unlikely(f->f_mode & FMODE_PATH)) {
-		f->f_op = &empty_fops;
-		return f;
-	}
-
-	f->f_op = fops_get(inode->i_fop);
-
-	error = security_dentry_open(f, cred);
-	if (error)
-		goto cleanup_all;
-
-	error = break_lease(inode, f->f_flags);
-	if (error)
-		goto cleanup_all;
-
-	if (!open && f->f_op)
-		open = f->f_op->open;
-	if (open) {
-		error = open(inode, f);
-		if (error)
-			goto cleanup_all;
-	}
-	if ((f->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
-		i_readcount_inc(inode);
-
-	f->f_flags &= ~(O_CREAT | O_EXCL | O_NOCTTY | O_TRUNC);
-
-	file_ra_state_init(&f->f_ra, f->f_mapping->host->i_mapping);
-
-	/* NB: we're sure to have correct a_ops only after f_op->open */
-	if (f->f_flags & O_DIRECT) {
-		if (!f->f_mapping->a_ops ||
-		    ((!f->f_mapping->a_ops->direct_IO) &&
-		    (!f->f_mapping->a_ops->get_xip_mem))) {
-			fput(f);
-			f = ERR_PTR(-EINVAL);
-		}
-	}
-
-	return f;
-
-cleanup_all:
-	fops_put(f->f_op);
-	if (f->f_mode & FMODE_WRITE) {
-		put_write_access(inode);
-		if (!special_file(inode->i_mode)) {
-			/*
-			 * We don't consider this a real
-			 * mnt_want/drop_write() pair
-			 * because it all happenend right
-			 * here, so just reset the state.
-			 */
-			file_reset_write(f);
-			mnt_drop_write(mnt);
-		}
-	}
-	file_sb_list_del(f);
-	f->f_path.dentry = NULL;
-	f->f_path.mnt = NULL;
-cleanup_file:
-	put_filp(f);
-	dput(dentry);
-	mntput(mnt);
-	return ERR_PTR(error);
-}
-
-/**
- * lookup_instantiate_filp - instantiates the open intent filp
- * @nd: pointer to nameidata
- * @dentry: pointer to dentry
- * @open: open callback
- *
- * Helper for filesystems that want to use lookup open intents and pass back
- * a fully instantiated struct file to the caller.
- * This function is meant to be called from within a filesystem's
- * lookup method.
- * Beware of calling it for non-regular files! Those ->open methods might block
- * (e.g. in fifo_open), leaving you with parent locked (and in case of fifo,
- * leading to a deadlock, as nobody can open that fifo anymore, because
- * another process to open fifo will block on locked parent when doing lookup).
- * Note that in case of error, nd->intent.open.file is destroyed, but the
- * path information remains valid.
- * If the open callback is set to NULL, then the standard f_op->open()
- * filesystem callback is substituted.
- */
-struct file *lookup_instantiate_filp(struct nameidata *nd, struct dentry *dentry,
-		int (*open)(struct inode *, struct file *))
-{
-	const struct cred *cred = current_cred();
-
-	if (IS_ERR(nd->intent.open.file))
-		goto out;
-	if (IS_ERR(dentry))
-		goto out_err;
-	nd->intent.open.file = __dentry_open(dget(dentry), mntget(nd->path.mnt),
-					     nd->intent.open.file,
-					     open, cred);
-out:
-	return nd->intent.open.file;
-out_err:
-	release_open_intent(nd);
-	nd->intent.open.file = ERR_CAST(dentry);
-	goto out;
-}
-EXPORT_SYMBOL_GPL(lookup_instantiate_filp);
-
-/**
- * nameidata_to_filp - convert a nameidata to an open filp.
- * @nd: pointer to nameidata
- * @flags: open flags
- *
- * Note that this function destroys the original nameidata
- */
-struct file *nameidata_to_filp(struct nameidata *nd)
-{
-	const struct cred *cred = current_cred();
-	struct file *filp;
-
-	/* Pick up the filp from the open intent */
-	filp = nd->intent.open.file;
-	nd->intent.open.file = NULL;
-
-	/* Has the filesystem initialised the file for us? */
-	if (filp->f_path.dentry == NULL) {
-		path_get(&nd->path);
-		filp = __dentry_open(nd->path.dentry, nd->path.mnt, filp,
-				     NULL, cred);
-	}
-	return filp;
-}
-
-/*
- * dentry_open() will have done dput(dentry) and mntput(mnt) if it returns an
- * error.
- */
-struct file *dentry_open(struct dentry *dentry, struct vfsmount *mnt, int flags,
-			 const struct cred *cred)
-{
-	int error;
-	struct file *f;
-
-	validate_creds(cred);
-
-	/* We must always pass in a valid mount pointer. */
-	BUG_ON(!mnt);
-
-	error = -ENFILE;
-	f = get_empty_filp();
-	if (f == NULL) {
-		dput(dentry);
-		mntput(mnt);
-		return ERR_PTR(error);
-	}
-
-	f->f_flags = flags;
-	return __dentry_open(dentry, mnt, f, NULL, cred);
-}
-EXPORT_SYMBOL(dentry_open);
-
-static void __put_unused_fd(struct files_struct *files, unsigned int fd)
-{
-	struct fdtable *fdt = files_fdtable(files);
-	__clear_open_fd(fd, fdt);
-	if (fd < files->next_fd)
-		files->next_fd = fd;
-}
-
-void put_unused_fd(unsigned int fd)
-{
-	struct files_struct *files = current->files;
-	spin_lock(&files->file_lock);
-	__put_unused_fd(files, fd);
-	spin_unlock(&files->file_lock);
-}
-
-EXPORT_SYMBOL(put_unused_fd);
-
-/*
- * Install a file pointer in the fd array.
- *
- * The VFS is full of places where we drop the files lock between
- * setting the open_fds bitmap and installing the file in the file
- * array.  At any such point, we are vulnerable to a dup2() race
- * installing a file in the array before us.  We need to detect this and
- * fput() the struct file we are about to overwrite in this case.
- *
- * It should never happen - if we allow dup2() do it, _really_ bad things
- * will follow.
- */
-
-void fd_install(unsigned int fd, struct file *file)
-{
-	struct files_struct *files = current->files;
-	struct fdtable *fdt;
-	spin_lock(&files->file_lock);
-	fdt = files_fdtable(files);
-	BUG_ON(fdt->fd[fd] != NULL);
-	rcu_assign_pointer(fdt->fd[fd], file);
-	spin_unlock(&files->file_lock);
-}
-
-EXPORT_SYMBOL(fd_install);
-
-static inline int build_open_flags(int flags, umode_t mode, struct open_flags *op)
-{
-	int lookup_flags = 0;
-	int acc_mode;
-
-	if (!(flags & O_CREAT))
-		mode = 0;
-	op->mode = mode;
-
-	/* Must never be set by userspace */
-	flags &= ~FMODE_NONOTIFY;
-
-	/*
-	 * O_SYNC is implemented as __O_SYNC|O_DSYNC.  As many places only
-	 * check for O_DSYNC if the need any syncing at all we enforce it's
-	 * always set instead of having to deal with possibly weird behaviour
-	 * for malicious applications setting only __O_SYNC.
-	 */
-	if (flags & __O_SYNC)
-		flags |= O_DSYNC;
-
-	/*
-	 * If we have O_PATH in the open flag. Then we
-	 * cannot have anything other than the below set of flags
-	 */
-	if (flags & O_PATH) {
-		flags &= O_DIRECTORY | O_NOFOLLOW | O_PATH;
-		acc_mode = 0;
-	} else {
-		acc_mode = MAY_OPEN | ACC_MODE(flags);
-	}
-
-	op->open_flag = flags;
-
-	/* O_TRUNC implies we need access checks for write permissions */
-	if (flags & O_TRUNC)
-		acc_mode |= MAY_WRITE;
-
-	/* Allow the LSM permission hook to distinguish append
-	   access from general write access. */
-	if (flags & O_APPEND)
-		acc_mode |= MAY_APPEND;
-
-	op->acc_mode = acc_mode;
-
-	op->intent = flags & O_PATH ? 0 : LOOKUP_OPEN;
-
-	if (flags & O_CREAT) {
-		op->intent |= LOOKUP_CREATE;
-		if (flags & O_EXCL)
-			op->intent |= LOOKUP_EXCL;
-	}
-
-	if (flags & O_DIRECTORY)
-		lookup_flags |= LOOKUP_DIRECTORY;
-	if (!(flags & O_NOFOLLOW))
-		lookup_flags |= LOOKUP_FOLLOW;
-	return lookup_flags;
-}
-
-/**
- * filp_open - open file and return file pointer
- *
- * @filename:	path to open
- * @flags:	open flags as per the open(2) second argument
- * @mode:	mode for the new file if O_CREAT is set, else ignored
- *
- * This is the helper to open a file from kernelspace if you really
- * have to.  But in generally you should not do this, so please move
- * along, nothing to see here..
- */
-struct file *filp_open(const char *filename, int flags, umode_t mode)
-{
-	struct open_flags op;
-	int lookup = build_open_flags(flags, mode, &op);
-	return do_filp_open(AT_FDCWD, filename, &op, lookup);
-}
-EXPORT_SYMBOL(filp_open);
-
-struct file *file_open_root(struct dentry *dentry, struct vfsmount *mnt,
-			    const char *filename, int flags)
-{
-	struct open_flags op;
-	int lookup = build_open_flags(flags, 0, &op);
-	if (flags & O_CREAT)
-		return ERR_PTR(-EINVAL);
-	if (!filename && (flags & O_DIRECTORY))
-		if (!dentry->d_inode->i_op->lookup)
-			return ERR_PTR(-ENOTDIR);
-	return do_file_open_root(dentry, mnt, filename, &op, lookup);
-}
-EXPORT_SYMBOL(file_open_root);
-
-long do_sys_open(int dfd, const char __user *filename, int flags, umode_t mode)
-{
-	struct open_flags op;
-	int lookup = build_open_flags(flags, mode, &op);
-	char *tmp = getname(filename);
-	int fd = PTR_ERR(tmp);
-
-	if (!IS_ERR(tmp)) {
-		fd = get_unused_fd_flags(flags);
-		if (fd >= 0) {
-			struct file *f = do_filp_open(dfd, tmp, &op, lookup);
-			if (IS_ERR(f)) {
-				put_unused_fd(fd);
-				fd = PTR_ERR(f);
-			} else {
-				fsnotify_open(f);
-				fd_install(fd, f);
-			}
-		}
-		putname(tmp);
-	}
-	return fd;
-}
-
-SYSCALL_DEFINE3(open, const char __user *, filename, int, flags, umode_t, mode)
-{
-	long ret;
-
-	if (force_o_largefile())
-		flags |= O_LARGEFILE;
-
-	ret = do_sys_open(AT_FDCWD, filename, flags, mode);
-	/* avoid REGPARM breakage on x86: */
-	asmlinkage_protect(3, ret, filename, flags, mode);
-	return ret;
-}
-
-SYSCALL_DEFINE4(openat, int, dfd, const char __user *, filename, int, flags,
-		umode_t, mode)
-{
-	long ret;
-
-	if (force_o_largefile())
-		flags |= O_LARGEFILE;
-
-	ret = do_sys_open(dfd, filename, flags, mode);
-	/* avoid REGPARM breakage on x86: */
-	asmlinkage_protect(4, ret, dfd, filename, flags, mode);
-	return ret;
-}
-
-#ifndef __alpha__
-
-/*
- * For backward compatibility?  Maybe this should be moved
- * into arch/i386 instead?
- */
-SYSCALL_DEFINE2(creat, const char __user *, pathname, umode_t, mode)
-{
-	return sys_open(pathname, O_CREAT | O_WRONLY | O_TRUNC, mode);
-}
-
-#endif
-
-/*
- * "id" is the POSIX thread ID. We use the
- * files pointer for this..
- */
-int filp_close(struct file *filp, fl_owner_t id)
-{
-	int retval = 0;
-
-	if (!file_count(filp)) {
-		printk(KERN_ERR "VFS: Close: file count is 0\n");
-		return 0;
-	}
-
-	if (filp->f_op && filp->f_op->flush)
-		retval = filp->f_op->flush(filp, id);
-
-	if (likely(!(filp->f_mode & FMODE_PATH))) {
-		dnotify_flush(filp, id);
-		locks_remove_posix(filp, id);
-	}
-	fput(filp);
-	return retval;
-}
-
-EXPORT_SYMBOL(filp_close);
-
-/*
- * Careful here! We test whether the file pointer is NULL before
- * releasing the fd. This ensures that one clone task can't release
- * an fd while another clone is opening it.
- */
-SYSCALL_DEFINE1(close, unsigned int, fd)
-{
-	struct file * filp;
-	struct files_struct *files = current->files;
-	struct fdtable *fdt;
-	int retval;
-
-	spin_lock(&files->file_lock);
-	fdt = files_fdtable(files);
-	if (fd >= fdt->max_fds)
-		goto out_unlock;
-	filp = fdt->fd[fd];
-	if (!filp)
-		goto out_unlock;
-	rcu_assign_pointer(fdt->fd[fd], NULL);
-	__clear_close_on_exec(fd, fdt);
-	__put_unused_fd(files, fd);
-	spin_unlock(&files->file_lock);
-	retval = filp_close(filp, files);
-
-	/* can't restart close syscall because file table entry was cleared */
-	if (unlikely(retval == -ERESTARTSYS ||
-		     retval == -ERESTARTNOINTR ||
-		     retval == -ERESTARTNOHAND ||
-		     retval == -ERESTART_RESTARTBLOCK))
-		retval = -EINTR;
-
-	return retval;
-
-out_unlock:
-	spin_unlock(&files->file_lock);
-	return -EBADF;
-}
-EXPORT_SYMBOL(sys_close);
-
-/*
- * This routine simulates a hangup on the tty, to arrange that users
- * are given clean terminals at login time.
- */
-SYSCALL_DEFINE0(vhangup)
-{
-	if (capable(CAP_SYS_TTY_CONFIG)) {
-		tty_vhangup_self();
-		return 0;
-	}
-	return -EPERM;
-}
-
-/*
- * Called when an inode is about to be open.
- * We use this to disallow opening large files on 32bit systems if
- * the caller didn't specify O_LARGEFILE.  On 64bit systems we force
- * on this flag in sys_open.
- */
-int generic_file_open(struct inode * inode, struct file * filp)
-{
-	if (!(filp->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS)
-		return -EOVERFLOW;
-	return 0;
-}
-
-EXPORT_SYMBOL(generic_file_open);
-
-/*
- * This is used by subsystems that don't want seekable
- * file descriptors. The function is not supposed to ever fail, the only
- * reason it returns an 'int' and not 'void' is so that it can be plugged
- * directly into file_operations structure.
- */
-int nonseekable_open(struct inode *inode, struct file *filp)
-{
-	filp->f_mode &= ~(FMODE_LSEEK | FMODE_PREAD | FMODE_PWRITE);
-	return 0;
-}
-
-EXPORT_SYMBOL(nonseekable_open);