Commit e886663c authored by Jens Axboe's avatar Jens Axboe
Browse files

fs: make do_renameat2() take struct filename 



Pass in the struct filename pointers instead of the user string, and
update the three callers to do the same.

This behaves like do_unlinkat(), which also takes a filename struct and
puts it when it is done. Converting callers is then trivial.

Signed-off-by: default avatarJens Axboe <axboe@kernel.dk>
parent 14587a46

fs/internal.h

+2 −0
Original line number Diff line number Diff line
@@ -78,6 +78,8 @@ extern int vfs_path_lookup(struct dentry *, struct vfsmount *, 
long do_rmdir(int dfd, struct filename *name);

long do_unlinkat(int dfd, struct filename *name);

int may_linkat(struct path *link);

int do_renameat2(int olddfd, struct filename *oldname, int newdfd,

		 struct filename *newname, unsigned int flags);



/*

 * namespace.c

fs/namei.c

+22 −18
Original line number Diff line number Diff line
@@ -4346,8 +4346,8 @@ out: 
}

EXPORT_SYMBOL(vfs_rename);



static int do_renameat2(int olddfd, const char __user *oldname, int newdfd,

			const char __user *newname, unsigned int flags)

int do_renameat2(int olddfd, struct filename *from, int newdfd,

		 struct filename *to, unsigned int flags)

{

	struct dentry *old_dentry, *new_dentry;

	struct dentry *trap;
@@ -4355,32 +4355,30 @@ static int do_renameat2(int olddfd, const char __user *oldname, int newdfd, 
	struct qstr old_last, new_last;

	int old_type, new_type;

	struct inode *delegated_inode = NULL;

	struct filename *from;

	struct filename *to;

	unsigned int lookup_flags = 0, target_flags = LOOKUP_RENAME_TARGET;

	bool should_retry = false;

	int error;

	int error = -EINVAL;



	if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))

		return -EINVAL;

		goto put_both;



	if ((flags & (RENAME_NOREPLACE | RENAME_WHITEOUT)) &&

	    (flags & RENAME_EXCHANGE))

		return -EINVAL;

		goto put_both;



	if (flags & RENAME_EXCHANGE)

		target_flags = 0;



retry:

	from = filename_parentat(olddfd, getname(oldname), lookup_flags,

				&old_path, &old_last, &old_type);

	from = filename_parentat(olddfd, from, lookup_flags, &old_path,

					&old_last, &old_type);

	if (IS_ERR(from)) {

		error = PTR_ERR(from);

		goto exit;

		goto put_new;

	}



	to = filename_parentat(newdfd, getname(newname), lookup_flags,

				&new_path, &new_last, &new_type);

	to = filename_parentat(newdfd, to, lookup_flags, &new_path, &new_last,

				&new_type);

	if (IS_ERR(to)) {

		error = PTR_ERR(to);

		goto exit1;
@@ -4473,34 +4471,40 @@ exit2: 
	if (retry_estale(error, lookup_flags))

		should_retry = true;

	path_put(&new_path);

	putname(to);

exit1:

	path_put(&old_path);

	putname(from);

	if (should_retry) {

		should_retry = false;

		lookup_flags |= LOOKUP_REVAL;

		goto retry;

	}

exit:

put_both:

	if (!IS_ERR(from))

		putname(from);

put_new:

	if (!IS_ERR(to))

		putname(to);

	return error;

}



SYSCALL_DEFINE5(renameat2, int, olddfd, const char __user *, oldname,

		int, newdfd, const char __user *, newname, unsigned int, flags)

{

	return do_renameat2(olddfd, oldname, newdfd, newname, flags);

	return do_renameat2(olddfd, getname(oldname), newdfd, getname(newname),

				flags);

}



SYSCALL_DEFINE4(renameat, int, olddfd, const char __user *, oldname,

		int, newdfd, const char __user *, newname)

{

	return do_renameat2(olddfd, oldname, newdfd, newname, 0);

	return do_renameat2(olddfd, getname(oldname), newdfd, getname(newname),

				0);

}



SYSCALL_DEFINE2(rename, const char __user *, oldname, const char __user *, newname)

{

	return do_renameat2(AT_FDCWD, oldname, AT_FDCWD, newname, 0);

	return do_renameat2(AT_FDCWD, getname(oldname), AT_FDCWD,

				getname(newname), 0);

}



int readlink_copy(char __user *buffer, int buflen, const char *link)

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