os_unlink.c

File system using stacked.

/*-
 * See the file LICENSE for redistribution information.
 *
 * Copyright (c) 1997-2002
 *	Sleepycat Software.  All rights reserved.
 */

#include "db_config.h"

#ifndef lint
static const char revid[] = "$Id: os_unlink.c,v 1.1.1.1 2004/08/19 23:53:56 gopalan Exp $";
#endif /* not lint */

#ifndef __KERNEL__

#ifndef NO_SYSTEM_INCLUDES
#include <sys/types.h>

#include <string.h>
#include <unistd.h>
#endif

#else

#include <linux/types.h>
#include <linux/string.h>
#include <linux/slab.h>
#endif /* __KERNEL__ */

#include "db_int.h"

/*
 * __os_region_unlink --
 *	Remove a shared memory object file.
 *
 * PUBLIC: int __os_region_unlink __P((DB_ENV *, const char *));
 */
int
__os_region_unlink(dbenv, path)
	DB_ENV *dbenv;
	const char *path;
{
#ifdef HAVE_QNX
	int ret;
	char *newname;

	if ((ret = __os_shmname(dbenv, path, &newname)) != 0)
		goto err;

	if ((ret = shm_unlink(newname)) != 0) {
		ret = __os_get_errno();
		if (ret != ENOENT)
			__db_err(dbenv, "shm_unlink: %s: %s",
			    newname, strerror(ret));
	}
err:
	if (newname != NULL)
		__os_free(dbenv, newname);
	return (ret);
#else
	if (F_ISSET(dbenv, DB_ENV_OVERWRITE))
		(void)__db_overwrite(dbenv, path);

	return (__os_unlink(dbenv, path));
#endif
}



#ifdef __KERNEL__
int kdb3_unlink(const char * name)
{
	int error = 0;
	struct dentry *dentry;
	struct nameidata nd;
	
        if(IS_ERR(name))
		return PTR_ERR(name);
	
	error = kdb3_path_lookup(name, LOOKUP_PARENT, &nd);
	if (error)
		goto exit;
	error = -EISDIR;
	if (nd.last_type != LAST_NORM)
		goto exit1;
	down(&nd.dentry->d_inode->i_sem);
	dentry = lookup_hash(&nd.last, nd.dentry);
	error = PTR_ERR(dentry);
	if (!IS_ERR(dentry)) {
		if (nd.last.name[nd.last.len])
			goto slashes;
		error = vfs_unlink(nd.dentry->d_inode, dentry);
	exit2:
		dput(dentry);
	}
	up(&nd.dentry->d_inode->i_sem);
exit1:
	path_release(&nd);
exit:
	return error;
	
slashes:
         error = !dentry->d_inode ? -ENOENT :
                 S_ISDIR(dentry->d_inode->i_mode) ? -EISDIR : -ENOTDIR;
         goto exit2;
}
#endif







/*
 * __os_unlink --
 *	Remove a file.
 *
 * PUBLIC: int __os_unlink __P((DB_ENV *, const char *));
 */
int
__os_unlink(dbenv, path)
	DB_ENV *dbenv;
	const char *path;
{
	int ret;

retry:	ret = DB_GLOBAL(j_unlink) != NULL ?
	    DB_GLOBAL(j_unlink)(path) :
#ifdef HAVE_VXWORKS
	    unlink((char *)path);
#else

#ifndef __KERNEL__
	    unlink(path);
#else
	    kdb3_unlink(path);
#endif
#endif
	if (ret == -1) {
		if ((ret = __os_get_errno()) == EINTR)
			goto retry;
		/*
		 * XXX
		 * We really shouldn't be looking at this value ourselves,
		 * but ENOENT usually signals that a file is missing, and
		 * we attempt to unlink things (such as v. 2.x environment
		 * regions, in DB_ENV->remove) that we're expecting not to
		 * be there.  Reporting errors in these cases is annoying.
		 */
#ifdef HAVE_VXWORKS
		/*
		 * XXX
		 * The results of unlink are file system driver specific
		 * on VxWorks.  In the case of removing a file that did
		 * not exist, some, at least, return an error, but with
		 * an errno of 0, not ENOENT.
		 *
		 * Code below falls through to original if-statement only
		 * we didn't get a "successful" error.
		 */
		if (ret != 0)
		/* FALLTHROUGH */
#endif

#ifndef __KERNEL__
		if (ret != ENOENT)
			__db_err(dbenv, "unlink: %s: %s", path, strerror(ret));
#endif
	}

	return (ret);
}