示例#1
0
/**
 * mnt_context_next_umount:
 * @cxt: context
 * @itr: iterator
 * @fs: returns the current filesystem
 * @mntrc: returns the return code from mnt_context_umount()
 * @ignored: returns 1 for not matching
 *
 * This function tries to umount the next filesystem from mtab (as returned by
 * mnt_context_get_mtab()).
 *
 * You can filter out filesystems by:
 *	mnt_context_set_options_pattern() to simulate umount -a -O pattern
 *	mnt_context_set_fstype_pattern()  to simulate umount -a -t pattern
 *
 * If the filesystem is not mounted or does not match the defined criteria,
 * then the function mnt_context_next_umount() returns zero, but the @ignored is
 * non-zero. Note that the root filesystem is always ignored.
 *
 * If umount(2) syscall or umount.type helper failed, then the
 * mnt_context_next_umount() function returns zero, but the @mntrc is non-zero.
 * Use also mnt_context_get_status() to check if the filesystem was
 * successfully umounted.
 *
 * Returns: 0 on success,
 *         <0 in case of error (!= umount(2) errors)
 *          1 at the end of the list.
 */
int mnt_context_next_umount(struct libmnt_context *cxt,
			   struct libmnt_iter *itr,
			   struct libmnt_fs **fs,
			   int *mntrc,
			   int *ignored)
{
	struct libmnt_table *mtab;
	const char *tgt;
	int rc;

	if (ignored)
		*ignored = 0;
	if (mntrc)
		*mntrc = 0;

	if (!cxt || !fs || !itr)
		return -EINVAL;

	rc = mnt_context_get_mtab(cxt, &mtab);
	cxt->mtab = NULL;		/* do not reset mtab */
	mnt_reset_context(cxt);
	cxt->mtab = mtab;

	if (rc)
		return rc;

	do {
		rc = mnt_table_next_fs(mtab, itr, fs);
		if (rc != 0)
			return rc;	/* no more filesystems (or error) */

		tgt = mnt_fs_get_target(*fs);
	} while (!tgt);

	DBG(CXT, ul_debugobj(cxt, "next-umount: trying %s [fstype: %s, t-pattern: %s, options: %s, O-pattern: %s]", tgt,
				 mnt_fs_get_fstype(*fs), cxt->fstype_pattern, mnt_fs_get_options(*fs), cxt->optstr_pattern));

	/* ignore filesystems which don't match options patterns */
	if ((cxt->fstype_pattern && !mnt_fs_match_fstype(*fs,
					cxt->fstype_pattern)) ||

	/* ignore filesystems which don't match type patterns */
	   (cxt->optstr_pattern && !mnt_fs_match_options(*fs,
					cxt->optstr_pattern))) {
		if (ignored)
			*ignored = 1;

		DBG(CXT, ul_debugobj(cxt, "next-umount: not-match"));
		return 0;
	}

	rc = mnt_context_set_fs(cxt, *fs);
	if (rc)
		return rc;
	rc = mnt_context_umount(cxt);
	if (mntrc)
		*mntrc = rc;
	return 0;
}
示例#2
0
/**
 * mnt_context_next_mount:
 * @cxt: context
 * @itr: iterator
 * @fs: returns the current filesystem
 * @mntrc: returns the return code from mnt_context_mount()
 * @ignored: returns 1 for not matching and 2 for already mounted filesystems
 *
 * This function tries to mount the next filesystem from fstab (as returned by
 * mnt_context_get_fstab()). See also mnt_context_set_fstab().
 *
 * You can filter out filesystems by:
 *	mnt_context_set_options_pattern() to simulate mount -a -O pattern
 *	mnt_context_set_fstype_pattern()  to simulate mount -a -t pattern
 *
 * If the filesystem is already mounted or does not match defined criteria,
 * then the mnt_context_next_mount() function returns zero, but the @ignored is
 * non-zero. Note that the root filesystem and filesystems with "noauto" option
 * are always ignored.
 *
 * If mount(2) syscall or mount.type helper failed, then the
 * mnt_context_next_mount() function returns zero, but the @mntrc is non-zero.
 * Use also mnt_context_get_status() to check if the filesystem was
 * successfully mounted.
 *
 * Returns: 0 on success,
 *         <0 in case of error (!= mount(2) errors)
 *          1 at the end of the list.
 */
int mnt_context_next_mount(struct libmnt_context *cxt,
			   struct libmnt_iter *itr,
			   struct libmnt_fs **fs,
			   int *mntrc,
			   int *ignored)
{
	struct libmnt_table *fstab, *mtab;
	const char *o, *tgt;
	int rc, mounted = 0;

	if (ignored)
		*ignored = 0;
	if (mntrc)
		*mntrc = 0;

	if (!cxt || !fs || !itr)
		return -EINVAL;

	mtab = cxt->mtab;
	cxt->mtab = NULL;		/* do not reset mtab */
	mnt_reset_context(cxt);
	cxt->mtab = mtab;

	rc = mnt_context_get_fstab(cxt, &fstab);
	if (rc)
		return rc;

	rc = mnt_table_next_fs(fstab, itr, fs);
	if (rc != 0)
		return rc;	/* more filesystems (or error) */

	o = mnt_fs_get_user_options(*fs);
	tgt = mnt_fs_get_target(*fs);

	DBG(CXT, mnt_debug_h(cxt, "next-mount: trying %s", tgt));

	/*  ignore swap */
	if (mnt_fs_is_swaparea(*fs) ||

	/* ignore root filesystem */
	   (tgt && (strcmp(tgt, "/") == 0 || strcmp(tgt, "root") == 0)) ||

	/* ignore noauto filesystems */
	   (o && mnt_optstr_get_option(o, "noauto", NULL, NULL) == 0) ||

	/* ignore filesystems not match with options patterns */
	   (cxt->fstype_pattern && !mnt_fs_match_fstype(*fs,
					cxt->fstype_pattern)) ||

	/* ignore filesystems not match with type patterns */
	   (cxt->optstr_pattern && !mnt_fs_match_options(*fs,
					cxt->optstr_pattern))) {
		if (ignored)
			*ignored = 1;
		DBG(CXT, mnt_debug_h(cxt, "next-mount: not-match "
				"[fstype: %s, t-pattern: %s, options: %s, O-pattern: %s]",
				mnt_fs_get_fstype(*fs),
				cxt->fstype_pattern,
				mnt_fs_get_options(*fs),
				cxt->optstr_pattern));
		return 0;
	}

	/* ignore already mounted filesystems */
	rc = mnt_context_is_fs_mounted(cxt, *fs, &mounted);
	if (rc)
		return rc;
	if (mounted) {
		if (ignored)
			*ignored = 2;
		return 0;
	}

	if (mnt_context_is_fork(cxt)) {
		rc = mnt_fork_context(cxt);
		if (rc)
			return rc;		/* fork error */

		if (mnt_context_is_parent(cxt)) {
			return 0;		/* parent */
		}
	}

	/* child or non-forked */

	rc = mnt_context_set_fs(cxt, *fs);
	if (!rc) {
		rc = mnt_context_mount(cxt);
		if (mntrc)
			*mntrc = rc;
	}

	if (mnt_context_is_child(cxt)) {
		DBG(CXT, mnt_debug_h(cxt, "next-mount: child exit [rc=%d]", rc));
		DBG_FLUSH;
		exit(rc);
	}
	return 0;
}