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Commit da2f1362 authored by Christoph Hellwig's avatar Christoph Hellwig Committed by Al Viro
Browse files

fs: expose do_unlinkat for built-in callers 



And make it take a struct filename instead of a user pointer.

Signed-off-by: default avatarChristoph Hellwig <hch@lst.de>
Signed-off-by: default avatarAl Viro <viro@zeniv.linux.org.uk>
parent e145b35b

fs/internal.h

+1 −0
Original line number Diff line number Diff line
@@ -55,6 +55,7 @@ extern void __init chrdev_init(void); 
extern int user_path_mountpoint_at(int, const char __user *, unsigned int, struct path *);

extern int vfs_path_lookup(struct dentry *, struct vfsmount *,

			   const char *, unsigned int, struct path *);

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



/*

 * namespace.c

fs/namei.c

+5 −7
Original line number Diff line number Diff line
@@ -4009,10 +4009,9 @@ EXPORT_SYMBOL(vfs_unlink); 
 * writeout happening, and we don't want to prevent access to the directory

 * while waiting on the I/O.

 */

static long do_unlinkat(int dfd, const char __user *pathname)

long do_unlinkat(int dfd, struct filename *name)

{

	int error;

	struct filename *name;

	struct dentry *dentry;

	struct path path;

	struct qstr last;
@@ -4021,8 +4020,7 @@ static long do_unlinkat(int dfd, const char __user *pathname) 
	struct inode *delegated_inode = NULL;

	unsigned int lookup_flags = 0;

retry:

	name = filename_parentat(dfd, getname(pathname), lookup_flags,

				&path, &last, &type);

	name = filename_parentat(dfd, name, lookup_flags, &path, &last, &type);

	if (IS_ERR(name))

		return PTR_ERR(name);
@@ -4064,12 +4062,12 @@ static long do_unlinkat(int dfd, const char __user *pathname) 
	mnt_drop_write(path.mnt);

exit1:

	path_put(&path);

	putname(name);

	if (retry_estale(error, lookup_flags)) {

		lookup_flags |= LOOKUP_REVAL;

		inode = NULL;

		goto retry;

	}

	putname(name);

	return error;



slashes:
@@ -4090,12 +4088,12 @@ SYSCALL_DEFINE3(unlinkat, int, dfd, const char __user *, pathname, int, flag) 
	if (flag & AT_REMOVEDIR)

		return do_rmdir(dfd, pathname);



	return do_unlinkat(dfd, pathname);

	return do_unlinkat(dfd, getname(pathname));

}



SYSCALL_DEFINE1(unlink, const char __user *, pathname)

{

	return do_unlinkat(AT_FDCWD, pathname);

	return do_unlinkat(AT_FDCWD, getname(pathname));

}



int vfs_symlink(struct inode *dir, struct dentry *dentry, const char *oldname)