Linux-libre 4.2-gnu

1 files changed, 0 insertions, 848 deletions

diff --git a/fs/aufs/vfsub.c b/fs/aufs/vfsub.c
deleted file mode 100644
index d2af7ce8d..000000000
--- a/fs/aufs/vfsub.c
+++ /dev/null
@@ -1,848 +0,0 @@
-/*
- * Copyright (C) 2005-2015 Junjiro R. Okajima
- *
- * This program, aufs is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program.  If not, see <http://www.gnu.org/licenses/>.
- */
-
-/*
- * sub-routines for VFS
- */
-
-#include <linux/namei.h>
-#include <linux/security.h>
-#include <linux/splice.h>
-#include "aufs.h"
-
-int vfsub_update_h_iattr(struct path *h_path, int *did)
-{
-	int err;
-	struct kstat st;
-	struct super_block *h_sb;
-
-	/* for remote fs, leave work for its getattr or d_revalidate */
-	/* for bad i_attr fs, handle them in aufs_getattr() */
-	/* still some fs may acquire i_mutex. we need to skip them */
-	err = 0;
-	if (!did)
-		did = &err;
-	h_sb = h_path->dentry->d_sb;
-	*did = (!au_test_fs_remote(h_sb) && au_test_fs_refresh_iattr(h_sb));
-	if (*did)
-		err = vfs_getattr(h_path, &st);
-
-	return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct file *vfsub_dentry_open(struct path *path, int flags)
-{
-	struct file *file;
-
-	file = dentry_open(path, flags /* | __FMODE_NONOTIFY */,
-			   current_cred());
-	if (!IS_ERR_OR_NULL(file)
-	    && (file->f_mode & (FMODE_READ | FMODE_WRITE)) == FMODE_READ)
-		i_readcount_inc(d_inode(path->dentry));
-
-	return file;
-}
-
-struct file *vfsub_filp_open(const char *path, int oflags, int mode)
-{
-	struct file *file;
-
-	lockdep_off();
-	file = filp_open(path,
-			 oflags /* | __FMODE_NONOTIFY */,
-			 mode);
-	lockdep_on();
-	if (IS_ERR(file))
-		goto out;
-	vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
-
-out:
-	return file;
-}
-
-/*
- * Ideally this function should call VFS:do_last() in order to keep all its
- * checkings. But it is very hard for aufs to regenerate several VFS internal
- * structure such as nameidata. This is a second (or third) best approach.
- * cf. linux/fs/namei.c:do_last(), lookup_open() and atomic_open().
- */
-int vfsub_atomic_open(struct inode *dir, struct dentry *dentry,
-		      struct vfsub_aopen_args *args, struct au_branch *br)
-{
-	int err;
-	struct file *file = args->file;
-	/* copied from linux/fs/namei.c:atomic_open() */
-	struct dentry *const DENTRY_NOT_SET = (void *)-1UL;
-
-	IMustLock(dir);
-	AuDebugOn(!dir->i_op->atomic_open);
-
-	err = au_br_test_oflag(args->open_flag, br);
-	if (unlikely(err))
-		goto out;
-
-	args->file->f_path.dentry = DENTRY_NOT_SET;
-	args->file->f_path.mnt = au_br_mnt(br);
-	err = dir->i_op->atomic_open(dir, dentry, file, args->open_flag,
-				     args->create_mode, args->opened);
-	if (err >= 0) {
-		/* some filesystems don't set FILE_CREATED while succeeded? */
-		if (*args->opened & FILE_CREATED)
-			fsnotify_create(dir, dentry);
-	} else
-		goto out;
-
-
-	if (!err) {
-		/* todo: call VFS:may_open() here */
-		err = open_check_o_direct(file);
-		/* todo: ima_file_check() too? */
-		if (!err && (args->open_flag & __FMODE_EXEC))
-			err = deny_write_access(file);
-		if (unlikely(err))
-			/* note that the file is created and still opened */
-			goto out;
-	}
-
-	atomic_inc(&br->br_count);
-	fsnotify_open(file);
-
-out:
-	return err;
-}
-
-int vfsub_kern_path(const char *name, unsigned int flags, struct path *path)
-{
-	int err;
-
-	err = kern_path(name, flags, path);
-	if (!err && d_is_positive(path->dentry))
-		vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/
-	return err;
-}
-
-struct dentry *vfsub_lookup_one_len(const char *name, struct dentry *parent,
-				    int len)
-{
-	struct path path = {
-		.mnt = NULL
-	};
-
-	/* VFS checks it too, but by WARN_ON_ONCE() */
-	IMustLock(d_inode(parent));
-
-	path.dentry = lookup_one_len(name, parent, len);
-	if (IS_ERR(path.dentry))
-		goto out;
-	if (d_is_positive(path.dentry))
-		vfsub_update_h_iattr(&path, /*did*/NULL); /*ignore*/
-
-out:
-	AuTraceErrPtr(path.dentry);
-	return path.dentry;
-}
-
-void vfsub_call_lkup_one(void *args)
-{
-	struct vfsub_lkup_one_args *a = args;
-	*a->errp = vfsub_lkup_one(a->name, a->parent);
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct dentry *vfsub_lock_rename(struct dentry *d1, struct au_hinode *hdir1,
-				 struct dentry *d2, struct au_hinode *hdir2)
-{
-	struct dentry *d;
-
-	lockdep_off();
-	d = lock_rename(d1, d2);
-	lockdep_on();
-	au_hn_suspend(hdir1);
-	if (hdir1 != hdir2)
-		au_hn_suspend(hdir2);
-
-	return d;
-}
-
-void vfsub_unlock_rename(struct dentry *d1, struct au_hinode *hdir1,
-			 struct dentry *d2, struct au_hinode *hdir2)
-{
-	au_hn_resume(hdir1);
-	if (hdir1 != hdir2)
-		au_hn_resume(hdir2);
-	lockdep_off();
-	unlock_rename(d1, d2);
-	lockdep_on();
-}
-
-/* ---------------------------------------------------------------------- */
-
-int vfsub_create(struct inode *dir, struct path *path, int mode, bool want_excl)
-{
-	int err;
-	struct dentry *d;
-
-	IMustLock(dir);
-
-	d = path->dentry;
-	path->dentry = d->d_parent;
-	err = security_path_mknod(path, d, mode, 0);
-	path->dentry = d;
-	if (unlikely(err))
-		goto out;
-
-	lockdep_off();
-	err = vfs_create(dir, path->dentry, mode, want_excl);
-	lockdep_on();
-	if (!err) {
-		struct path tmp = *path;
-		int did;
-
-		vfsub_update_h_iattr(&tmp, &did);
-		if (did) {
-			tmp.dentry = path->dentry->d_parent;
-			vfsub_update_h_iattr(&tmp, /*did*/NULL);
-		}
-		/*ignore*/
-	}
-
-out:
-	return err;
-}
-
-int vfsub_symlink(struct inode *dir, struct path *path, const char *symname)
-{
-	int err;
-	struct dentry *d;
-
-	IMustLock(dir);
-
-	d = path->dentry;
-	path->dentry = d->d_parent;
-	err = security_path_symlink(path, d, symname);
-	path->dentry = d;
-	if (unlikely(err))
-		goto out;
-
-	lockdep_off();
-	err = vfs_symlink(dir, path->dentry, symname);
-	lockdep_on();
-	if (!err) {
-		struct path tmp = *path;
-		int did;
-
-		vfsub_update_h_iattr(&tmp, &did);
-		if (did) {
-			tmp.dentry = path->dentry->d_parent;
-			vfsub_update_h_iattr(&tmp, /*did*/NULL);
-		}
-		/*ignore*/
-	}
-
-out:
-	return err;
-}
-
-int vfsub_mknod(struct inode *dir, struct path *path, int mode, dev_t dev)
-{
-	int err;
-	struct dentry *d;
-
-	IMustLock(dir);
-
-	d = path->dentry;
-	path->dentry = d->d_parent;
-	err = security_path_mknod(path, d, mode, new_encode_dev(dev));
-	path->dentry = d;
-	if (unlikely(err))
-		goto out;
-
-	lockdep_off();
-	err = vfs_mknod(dir, path->dentry, mode, dev);
-	lockdep_on();
-	if (!err) {
-		struct path tmp = *path;
-		int did;
-
-		vfsub_update_h_iattr(&tmp, &did);
-		if (did) {
-			tmp.dentry = path->dentry->d_parent;
-			vfsub_update_h_iattr(&tmp, /*did*/NULL);
-		}
-		/*ignore*/
-	}
-
-out:
-	return err;
-}
-
-static int au_test_nlink(struct inode *inode)
-{
-	const unsigned int link_max = UINT_MAX >> 1; /* rough margin */
-
-	if (!au_test_fs_no_limit_nlink(inode->i_sb)
-	    || inode->i_nlink < link_max)
-		return 0;
-	return -EMLINK;
-}
-
-int vfsub_link(struct dentry *src_dentry, struct inode *dir, struct path *path,
-	       struct inode **delegated_inode)
-{
-	int err;
-	struct dentry *d;
-
-	IMustLock(dir);
-
-	err = au_test_nlink(d_inode(src_dentry));
-	if (unlikely(err))
-		return err;
-
-	/* we don't call may_linkat() */
-	d = path->dentry;
-	path->dentry = d->d_parent;
-	err = security_path_link(src_dentry, path, d);
-	path->dentry = d;
-	if (unlikely(err))
-		goto out;
-
-	lockdep_off();
-	err = vfs_link(src_dentry, dir, path->dentry, delegated_inode);
-	lockdep_on();
-	if (!err) {
-		struct path tmp = *path;
-		int did;
-
-		/* fuse has different memory inode for the same inumber */
-		vfsub_update_h_iattr(&tmp, &did);
-		if (did) {
-			tmp.dentry = path->dentry->d_parent;
-			vfsub_update_h_iattr(&tmp, /*did*/NULL);
-			tmp.dentry = src_dentry;
-			vfsub_update_h_iattr(&tmp, /*did*/NULL);
-		}
-		/*ignore*/
-	}
-
-out:
-	return err;
-}
-
-int vfsub_rename(struct inode *src_dir, struct dentry *src_dentry,
-		 struct inode *dir, struct path *path,
-		 struct inode **delegated_inode)
-{
-	int err;
-	struct path tmp = {
-		.mnt	= path->mnt
-	};
-	struct dentry *d;
-
-	IMustLock(dir);
-	IMustLock(src_dir);
-
-	d = path->dentry;
-	path->dentry = d->d_parent;
-	tmp.dentry = src_dentry->d_parent;
-	err = security_path_rename(&tmp, src_dentry, path, d, /*flags*/0);
-	path->dentry = d;
-	if (unlikely(err))
-		goto out;
-
-	lockdep_off();
-	err = vfs_rename(src_dir, src_dentry, dir, path->dentry,
-			 delegated_inode, /*flags*/0);
-	lockdep_on();
-	if (!err) {
-		int did;
-
-		tmp.dentry = d->d_parent;
-		vfsub_update_h_iattr(&tmp, &did);
-		if (did) {
-			tmp.dentry = src_dentry;
-			vfsub_update_h_iattr(&tmp, /*did*/NULL);
-			tmp.dentry = src_dentry->d_parent;
-			vfsub_update_h_iattr(&tmp, /*did*/NULL);
-		}
-		/*ignore*/
-	}
-
-out:
-	return err;
-}
-
-int vfsub_mkdir(struct inode *dir, struct path *path, int mode)
-{
-	int err;
-	struct dentry *d;
-
-	IMustLock(dir);
-
-	d = path->dentry;
-	path->dentry = d->d_parent;
-	err = security_path_mkdir(path, d, mode);
-	path->dentry = d;
-	if (unlikely(err))
-		goto out;
-
-	lockdep_off();
-	err = vfs_mkdir(dir, path->dentry, mode);
-	lockdep_on();
-	if (!err) {
-		struct path tmp = *path;
-		int did;
-
-		vfsub_update_h_iattr(&tmp, &did);
-		if (did) {
-			tmp.dentry = path->dentry->d_parent;
-			vfsub_update_h_iattr(&tmp, /*did*/NULL);
-		}
-		/*ignore*/
-	}
-
-out:
-	return err;
-}
-
-int vfsub_rmdir(struct inode *dir, struct path *path)
-{
-	int err;
-	struct dentry *d;
-
-	IMustLock(dir);
-
-	d = path->dentry;
-	path->dentry = d->d_parent;
-	err = security_path_rmdir(path, d);
-	path->dentry = d;
-	if (unlikely(err))
-		goto out;
-
-	lockdep_off();
-	err = vfs_rmdir(dir, path->dentry);
-	lockdep_on();
-	if (!err) {
-		struct path tmp = {
-			.dentry	= path->dentry->d_parent,
-			.mnt	= path->mnt
-		};
-
-		vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/
-	}
-
-out:
-	return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-/* todo: support mmap_sem? */
-ssize_t vfsub_read_u(struct file *file, char __user *ubuf, size_t count,
-		     loff_t *ppos)
-{
-	ssize_t err;
-
-	lockdep_off();
-	err = vfs_read(file, ubuf, count, ppos);
-	lockdep_on();
-	if (err >= 0)
-		vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
-	return err;
-}
-
-/* todo: kernel_read()? */
-ssize_t vfsub_read_k(struct file *file, void *kbuf, size_t count,
-		     loff_t *ppos)
-{
-	ssize_t err;
-	mm_segment_t oldfs;
-	union {
-		void *k;
-		char __user *u;
-	} buf;
-
-	buf.k = kbuf;
-	oldfs = get_fs();
-	set_fs(KERNEL_DS);
-	err = vfsub_read_u(file, buf.u, count, ppos);
-	set_fs(oldfs);
-	return err;
-}
-
-ssize_t vfsub_write_u(struct file *file, const char __user *ubuf, size_t count,
-		      loff_t *ppos)
-{
-	ssize_t err;
-
-	lockdep_off();
-	err = vfs_write(file, ubuf, count, ppos);
-	lockdep_on();
-	if (err >= 0)
-		vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
-	return err;
-}
-
-ssize_t vfsub_write_k(struct file *file, void *kbuf, size_t count, loff_t *ppos)
-{
-	ssize_t err;
-	mm_segment_t oldfs;
-	union {
-		void *k;
-		const char __user *u;
-	} buf;
-
-	buf.k = kbuf;
-	oldfs = get_fs();
-	set_fs(KERNEL_DS);
-	err = vfsub_write_u(file, buf.u, count, ppos);
-	set_fs(oldfs);
-	return err;
-}
-
-int vfsub_flush(struct file *file, fl_owner_t id)
-{
-	int err;
-
-	err = 0;
-	if (file->f_op->flush) {
-		if (!au_test_nfs(file->f_path.dentry->d_sb))
-			err = file->f_op->flush(file, id);
-		else {
-			lockdep_off();
-			err = file->f_op->flush(file, id);
-			lockdep_on();
-		}
-		if (!err)
-			vfsub_update_h_iattr(&file->f_path, /*did*/NULL);
-		/*ignore*/
-	}
-	return err;
-}
-
-int vfsub_iterate_dir(struct file *file, struct dir_context *ctx)
-{
-	int err;
-
-	AuDbg("%pD, ctx{%pf, %llu}\n", file, ctx->actor, ctx->pos);
-
-	lockdep_off();
-	err = iterate_dir(file, ctx);
-	lockdep_on();
-	if (err >= 0)
-		vfsub_update_h_iattr(&file->f_path, /*did*/NULL); /*ignore*/
-	return err;
-}
-
-long vfsub_splice_to(struct file *in, loff_t *ppos,
-		     struct pipe_inode_info *pipe, size_t len,
-		     unsigned int flags)
-{
-	long err;
-
-	lockdep_off();
-	err = do_splice_to(in, ppos, pipe, len, flags);
-	lockdep_on();
-	file_accessed(in);
-	if (err >= 0)
-		vfsub_update_h_iattr(&in->f_path, /*did*/NULL); /*ignore*/
-	return err;
-}
-
-long vfsub_splice_from(struct pipe_inode_info *pipe, struct file *out,
-		       loff_t *ppos, size_t len, unsigned int flags)
-{
-	long err;
-
-	lockdep_off();
-	err = do_splice_from(pipe, out, ppos, len, flags);
-	lockdep_on();
-	if (err >= 0)
-		vfsub_update_h_iattr(&out->f_path, /*did*/NULL); /*ignore*/
-	return err;
-}
-
-int vfsub_fsync(struct file *file, struct path *path, int datasync)
-{
-	int err;
-
-	/* file can be NULL */
-	lockdep_off();
-	err = vfs_fsync(file, datasync);
-	lockdep_on();
-	if (!err) {
-		if (!path) {
-			AuDebugOn(!file);
-			path = &file->f_path;
-		}
-		vfsub_update_h_iattr(path, /*did*/NULL); /*ignore*/
-	}
-	return err;
-}
-
-/* cf. open.c:do_sys_truncate() and do_sys_ftruncate() */
-int vfsub_trunc(struct path *h_path, loff_t length, unsigned int attr,
-		struct file *h_file)
-{
-	int err;
-	struct inode *h_inode;
-	struct super_block *h_sb;
-
-	if (!h_file) {
-		err = vfsub_truncate(h_path, length);
-		goto out;
-	}
-
-	h_inode = d_inode(h_path->dentry);
-	h_sb = h_inode->i_sb;
-	lockdep_off();
-	sb_start_write(h_sb);
-	lockdep_on();
-	err = locks_verify_truncate(h_inode, h_file, length);
-	if (!err)
-		err = security_path_truncate(h_path);
-	if (!err) {
-		lockdep_off();
-		err = do_truncate(h_path->dentry, length, attr, h_file);
-		lockdep_on();
-	}
-	lockdep_off();
-	sb_end_write(h_sb);
-	lockdep_on();
-
-out:
-	return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct au_vfsub_mkdir_args {
-	int *errp;
-	struct inode *dir;
-	struct path *path;
-	int mode;
-};
-
-static void au_call_vfsub_mkdir(void *args)
-{
-	struct au_vfsub_mkdir_args *a = args;
-	*a->errp = vfsub_mkdir(a->dir, a->path, a->mode);
-}
-
-int vfsub_sio_mkdir(struct inode *dir, struct path *path, int mode)
-{
-	int err, do_sio, wkq_err;
-
-	do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE);
-	if (!do_sio) {
-		lockdep_off();
-		err = vfsub_mkdir(dir, path, mode);
-		lockdep_on();
-	} else {
-		struct au_vfsub_mkdir_args args = {
-			.errp	= &err,
-			.dir	= dir,
-			.path	= path,
-			.mode	= mode
-		};
-		wkq_err = au_wkq_wait(au_call_vfsub_mkdir, &args);
-		if (unlikely(wkq_err))
-			err = wkq_err;
-	}
-
-	return err;
-}
-
-struct au_vfsub_rmdir_args {
-	int *errp;
-	struct inode *dir;
-	struct path *path;
-};
-
-static void au_call_vfsub_rmdir(void *args)
-{
-	struct au_vfsub_rmdir_args *a = args;
-	*a->errp = vfsub_rmdir(a->dir, a->path);
-}
-
-int vfsub_sio_rmdir(struct inode *dir, struct path *path)
-{
-	int err, do_sio, wkq_err;
-
-	do_sio = au_test_h_perm_sio(dir, MAY_EXEC | MAY_WRITE);
-	if (!do_sio) {
-		lockdep_off();
-		err = vfsub_rmdir(dir, path);
-		lockdep_on();
-	} else {
-		struct au_vfsub_rmdir_args args = {
-			.errp	= &err,
-			.dir	= dir,
-			.path	= path
-		};
-		wkq_err = au_wkq_wait(au_call_vfsub_rmdir, &args);
-		if (unlikely(wkq_err))
-			err = wkq_err;
-	}
-
-	return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct notify_change_args {
-	int *errp;
-	struct path *path;
-	struct iattr *ia;
-	struct inode **delegated_inode;
-};
-
-static void call_notify_change(void *args)
-{
-	struct notify_change_args *a = args;
-	struct inode *h_inode;
-
-	h_inode = d_inode(a->path->dentry);
-	IMustLock(h_inode);
-
-	*a->errp = -EPERM;
-	if (!IS_IMMUTABLE(h_inode) && !IS_APPEND(h_inode)) {
-		lockdep_off();
-		*a->errp = notify_change(a->path->dentry, a->ia,
-					 a->delegated_inode);
-		lockdep_on();
-		if (!*a->errp)
-			vfsub_update_h_iattr(a->path, /*did*/NULL); /*ignore*/
-	}
-	AuTraceErr(*a->errp);
-}
-
-int vfsub_notify_change(struct path *path, struct iattr *ia,
-			struct inode **delegated_inode)
-{
-	int err;
-	struct notify_change_args args = {
-		.errp			= &err,
-		.path			= path,
-		.ia			= ia,
-		.delegated_inode	= delegated_inode
-	};
-
-	call_notify_change(&args);
-
-	return err;
-}
-
-int vfsub_sio_notify_change(struct path *path, struct iattr *ia,
-			    struct inode **delegated_inode)
-{
-	int err, wkq_err;
-	struct notify_change_args args = {
-		.errp			= &err,
-		.path			= path,
-		.ia			= ia,
-		.delegated_inode	= delegated_inode
-	};
-
-	wkq_err = au_wkq_wait(call_notify_change, &args);
-	if (unlikely(wkq_err))
-		err = wkq_err;
-
-	return err;
-}
-
-/* ---------------------------------------------------------------------- */
-
-struct unlink_args {
-	int *errp;
-	struct inode *dir;
-	struct path *path;
-	struct inode **delegated_inode;
-};
-
-static void call_unlink(void *args)
-{
-	struct unlink_args *a = args;
-	struct dentry *d = a->path->dentry;
-	struct inode *h_inode;
-	const int stop_sillyrename = (au_test_nfs(d->d_sb)
-				      && au_dcount(d) == 1);
-
-	IMustLock(a->dir);
-
-	a->path->dentry = d->d_parent;
-	*a->errp = security_path_unlink(a->path, d);
-	a->path->dentry = d;
-	if (unlikely(*a->errp))
-		return;
-
-	if (!stop_sillyrename)
-		dget(d);
-	h_inode = NULL;
-	if (d_is_positive(d)) {
-		h_inode = d_inode(d);
-		ihold(h_inode);
-	}
-
-	lockdep_off();
-	*a->errp = vfs_unlink(a->dir, d, a->delegated_inode);
-	lockdep_on();
-	if (!*a->errp) {
-		struct path tmp = {
-			.dentry = d->d_parent,
-			.mnt	= a->path->mnt
-		};
-		vfsub_update_h_iattr(&tmp, /*did*/NULL); /*ignore*/
-	}
-
-	if (!stop_sillyrename)
-		dput(d);
-	if (h_inode)
-		iput(h_inode);
-
-	AuTraceErr(*a->errp);
-}
-
-/*
- * @dir: must be locked.
- * @dentry: target dentry.
- */
-int vfsub_unlink(struct inode *dir, struct path *path,
-		 struct inode **delegated_inode, int force)
-{
-	int err;
-	struct unlink_args args = {
-		.errp			= &err,
-		.dir			= dir,
-		.path			= path,
-		.delegated_inode	= delegated_inode
-	};
-
-	if (!force)
-		call_unlink(&args);
-	else {
-		int wkq_err;
-
-		wkq_err = au_wkq_wait(call_unlink, &args);
-		if (unlikely(wkq_err))
-			err = wkq_err;
-	}
-
-	return err;
-}