示例#1
0
int
dsl_prop_get_ds(dsl_dataset_t *ds, const char *propname,
    int intsz, int numints, void *buf, char *setpoint)
{
	zfs_prop_t prop = zfs_name_to_prop(propname);
	boolean_t inheritable;
	boolean_t snapshot;
	uint64_t zapobj;

	ASSERT(dsl_pool_config_held(ds->ds_dir->dd_pool));
	inheritable = (prop == ZPROP_INVAL || zfs_prop_inheritable(prop));
	snapshot = (ds->ds_phys != NULL && dsl_dataset_is_snapshot(ds));
	zapobj = (ds->ds_phys == NULL ? 0 : ds->ds_phys->ds_props_obj);

	if (zapobj != 0) {
		objset_t *mos = ds->ds_dir->dd_pool->dp_meta_objset;
		int err;

		ASSERT(snapshot);

		/* Check for a local value. */
		err = zap_lookup(mos, zapobj, propname, intsz, numints, buf);
		if (err != ENOENT) {
			if (setpoint != NULL && err == 0)
				dsl_dataset_name(ds, setpoint);
			return (err);
		}

		/*
		 * Skip the check for a received value if there is an explicit
		 * inheritance entry.
		 */
		if (inheritable) {
			char *inheritstr = kmem_asprintf("%s%s", propname,
			    ZPROP_INHERIT_SUFFIX);
			err = zap_contains(mos, zapobj, inheritstr);
			strfree(inheritstr);
			if (err != 0 && err != ENOENT)
				return (err);
		}

		if (err == ENOENT) {
			/* Check for a received value. */
			char *recvdstr = kmem_asprintf("%s%s", propname,
			    ZPROP_RECVD_SUFFIX);
			err = zap_lookup(mos, zapobj, recvdstr,
			    intsz, numints, buf);
			strfree(recvdstr);
			if (err != ENOENT) {
				if (setpoint != NULL && err == 0)
					(void) strcpy(setpoint,
					    ZPROP_SOURCE_VAL_RECVD);
				return (err);
			}
		}
	}

	return (dsl_prop_get_dd(ds->ds_dir, propname,
	    intsz, numints, buf, setpoint, snapshot));
}
示例#2
0
文件: zfs_ctldir.c 项目: EW1/zfs
static int
__zfsctl_unmount_snapshot(zfs_snapentry_t *sep, int flags)
{
	char *argv[] = { "/bin/sh", "-c", NULL, NULL };
	char *envp[] = { NULL };
	int error;

	argv[2] = kmem_asprintf(SET_UNMOUNT_CMD,
	    flags & MNT_FORCE ? "-f " : "", sep->se_path);
	error = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
	strfree(argv[2]);

	/*
	 * The umount system utility will return 256 on error.  We must
	 * assume this error is because the file system is busy so it is
	 * converted to the more sensible EBUSY.
	 */
	if (error)
		error = EBUSY;

	/*
	 * This was the result of a manual unmount, cancel the delayed work
	 * to prevent zfsctl_expire_snapshot() from attempting a unmount.
	 */
	if ((error == 0) && !(flags & MNT_EXPIRE))
		taskq_cancel_id(zfs_expire_taskq, sep->se_taskqid);


	return (error);
}
示例#3
0
int
dmu_objset_snapshot_one(const char *fsname, const char *snapname)
{
	int err;
	char *longsnap = kmem_asprintf("%s@%s", fsname, snapname);
	nvlist_t *snaps = fnvlist_alloc();

	fnvlist_add_boolean(snaps, longsnap);
	strfree(longsnap);
	err = dsl_dataset_snapshot(snaps, NULL, NULL);
	fnvlist_free(snaps);
	return (err);
}
示例#4
0
static int
__zpl_xattr_security_set(struct inode *ip, const char *name,
    const void *value, size_t size, int flags)
{
	char *xattr_name;
	int error;

	if (strcmp(name, "") == 0)
		return -EINVAL;

	xattr_name = kmem_asprintf("%s%s", XATTR_SECURITY_PREFIX, name);
	error = zpl_xattr_set(ip, xattr_name, value, size, flags);
	strfree(xattr_name);

	return (error);
}
示例#5
0
static int
__zpl_xattr_security_set(struct inode *ip, const char *name,
    const void *value, size_t size, int flags)
{
	char *xattr_name;
	int error;
	/* xattr_resolve_name will do this for us if this is defined */
#ifndef HAVE_XATTR_HANDLER_NAME
	if (strcmp(name, "") == 0)
		return (-EINVAL);
#endif
	xattr_name = kmem_asprintf("%s%s", XATTR_SECURITY_PREFIX, name);
	error = zpl_xattr_set(ip, xattr_name, value, size, flags);
	strfree(xattr_name);

	return (error);
}
示例#6
0
static int
__zpl_xattr_trusted_set(struct inode *ip, const char *name,
    const void *value, size_t size, int flags)
{
	char *xattr_name;
	int error;

	if (!capable(CAP_SYS_ADMIN))
		return -EACCES;

	if (strcmp(name, "") == 0)
		return -EINVAL;

	xattr_name = kmem_asprintf("%s%s", XATTR_TRUSTED_PREFIX, name);
	error = zpl_xattr_set(ip, xattr_name, value, size, flags);
	strfree(xattr_name);

	return (error);
}
示例#7
0
static int
__zpl_xattr_user_set(struct inode *ip, const char *name,
    const void *value, size_t size, int flags)
{
	char *xattr_name;
	int error;

	if (strcmp(name, "") == 0)
		return -EINVAL;

	if (!(ITOZSB(ip)->z_flags & ZSB_XATTR))
		return -EOPNOTSUPP;

	xattr_name = kmem_asprintf("%s%s", XATTR_USER_PREFIX, name);
	error = zpl_xattr_set(ip, xattr_name, value, size, flags);
	strfree(xattr_name);

	return (error);
}
示例#8
0
static int
__zpl_xattr_trusted_set(struct inode *ip, const char *name,
    const void *value, size_t size, int flags)
{
	char *xattr_name;
	int error;

	if (!capable(CAP_SYS_ADMIN))
		return (-EACCES);
	/* xattr_resolve_name will do this for us if this is defined */
#ifndef HAVE_XATTR_HANDLER_NAME
	if (strcmp(name, "") == 0)
		return (-EINVAL);
#endif
	xattr_name = kmem_asprintf("%s%s", XATTR_TRUSTED_PREFIX, name);
	error = zpl_xattr_set(ip, xattr_name, value, size, flags);
	strfree(xattr_name);

	return (error);
}
示例#9
0
static int
__zpl_xattr_user_set(struct inode *ip, const char *name,
    const void *value, size_t size, int flags)
{
	char *xattr_name;
	int error;
	/* xattr_resolve_name will do this for us if this is defined */
#ifndef HAVE_XATTR_HANDLER_NAME
	if (strcmp(name, "") == 0)
		return (-EINVAL);
#endif
	if (!(ITOZSB(ip)->z_flags & ZSB_XATTR))
		return (-EOPNOTSUPP);

	xattr_name = kmem_asprintf("%s%s", XATTR_USER_PREFIX, name);
	error = zpl_xattr_set(ip, xattr_name, value, size, flags);
	strfree(xattr_name);

	return (error);
}
示例#10
0
static int
dsl_dataset_user_release_check_one(dsl_dataset_user_release_arg_t *ddura,
    dsl_dataset_t *ds, nvlist_t *holds, const char *snapname)
{
	uint64_t zapobj;
	nvlist_t *holds_found;
	objset_t *mos;
	int numholds;

	if (!dsl_dataset_is_snapshot(ds))
		return (SET_ERROR(EINVAL));

	if (nvlist_empty(holds))
		return (0);

	numholds = 0;
	mos = ds->ds_dir->dd_pool->dp_meta_objset;
	zapobj = ds->ds_phys->ds_userrefs_obj;
	holds_found = fnvlist_alloc();

	for (nvpair_t *pair = nvlist_next_nvpair(holds, NULL); pair != NULL;
	    pair = nvlist_next_nvpair(holds, pair)) {
		uint64_t tmp;
		int error;
		const char *holdname = nvpair_name(pair);

		if (zapobj != 0)
			error = zap_lookup(mos, zapobj, holdname, 8, 1, &tmp);
		else
			error = SET_ERROR(ENOENT);

		/*
		 * Non-existent holds are put on the errlist, but don't
		 * cause an overall failure.
		 */
		if (error == ENOENT) {
			if (ddura->ddura_errlist != NULL) {
				char *errtag = kmem_asprintf("%s#%s",
				    snapname, holdname);
				fnvlist_add_int32(ddura->ddura_errlist, errtag,
				    ENOENT);
				strfree(errtag);
			}
			continue;
		}

		if (error != 0) {
			fnvlist_free(holds_found);
			return (error);
		}

		fnvlist_add_boolean(holds_found, holdname);
		numholds++;
	}

	if (DS_IS_DEFER_DESTROY(ds) && ds->ds_phys->ds_num_children == 1 &&
	    ds->ds_userrefs == numholds) {
		/* we need to destroy the snapshot as well */
		if (dsl_dataset_long_held(ds)) {
			fnvlist_free(holds_found);
			return (SET_ERROR(EBUSY));
		}
		fnvlist_add_boolean(ddura->ddura_todelete, snapname);
	}

	if (numholds != 0) {
		fnvlist_add_nvlist(ddura->ddura_chkholds, snapname,
		    holds_found);
	}
	fnvlist_free(holds_found);

	return (0);
}
示例#11
0
文件: dsl_prop.c 项目: Alyseo/zfs
int
dsl_prop_get_dd(dsl_dir_t *dd, const char *propname,
    int intsz, int numints, void *buf, char *setpoint, boolean_t snapshot)
{
	int err = ENOENT;
	dsl_dir_t *target = dd;
	objset_t *mos = dd->dd_pool->dp_meta_objset;
	zfs_prop_t prop;
	boolean_t inheritable;
	boolean_t inheriting = B_FALSE;
	char *inheritstr;
	char *recvdstr;

	ASSERT(dsl_pool_config_held(dd->dd_pool));

	if (setpoint)
		setpoint[0] = '\0';

	prop = zfs_name_to_prop(propname);
	inheritable = (prop == ZPROP_INVAL || zfs_prop_inheritable(prop));
	inheritstr = kmem_asprintf("%s%s", propname, ZPROP_INHERIT_SUFFIX);
	recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);

	/*
	 * Note: dd may become NULL, therefore we shouldn't dereference it
	 * after this loop.
	 */
	for (; dd != NULL; dd = dd->dd_parent) {
		if (dd != target || snapshot) {
			if (!inheritable)
				break;
			inheriting = B_TRUE;
		}

		/* Check for a local value. */
		err = zap_lookup(mos, dsl_dir_phys(dd)->dd_props_zapobj,
		    propname, intsz, numints, buf);
		if (err != ENOENT) {
			if (setpoint != NULL && err == 0)
				dsl_dir_name(dd, setpoint);
			break;
		}

		/*
		 * Skip the check for a received value if there is an explicit
		 * inheritance entry.
		 */
		err = zap_contains(mos, dsl_dir_phys(dd)->dd_props_zapobj,
		    inheritstr);
		if (err != 0 && err != ENOENT)
			break;

		if (err == ENOENT) {
			/* Check for a received value. */
			err = zap_lookup(mos, dsl_dir_phys(dd)->dd_props_zapobj,
			    recvdstr, intsz, numints, buf);
			if (err != ENOENT) {
				if (setpoint != NULL && err == 0) {
					if (inheriting) {
						dsl_dir_name(dd, setpoint);
					} else {
						(void) strcpy(setpoint,
						    ZPROP_SOURCE_VAL_RECVD);
					}
				}
				break;
			}
		}

		/*
		 * If we found an explicit inheritance entry, err is zero even
		 * though we haven't yet found the value, so reinitializing err
		 * at the end of the loop (instead of at the beginning) ensures
		 * that err has a valid post-loop value.
		 */
		err = SET_ERROR(ENOENT);
	}

	if (err == ENOENT)
		err = dodefault(propname, intsz, numints, buf);

	strfree(inheritstr);
	strfree(recvdstr);

	return (err);
}
示例#12
0
文件: dsl_prop.c 项目: Alyseo/zfs
/*
 * Predict the effective value of the given special property if it were set with
 * the given value and source. This is not a general purpose function. It exists
 * only to handle the special requirements of the quota and reservation
 * properties. The fact that these properties are non-inheritable greatly
 * simplifies the prediction logic.
 *
 * Returns 0 on success, a positive error code on failure, or -1 if called with
 * a property not handled by this function.
 */
int
dsl_prop_predict(dsl_dir_t *dd, const char *propname,
    zprop_source_t source, uint64_t value, uint64_t *newvalp)
{
	zfs_prop_t prop = zfs_name_to_prop(propname);
	objset_t *mos;
	uint64_t zapobj;
	uint64_t version;
	char *recvdstr;
	int err = 0;

	switch (prop) {
	case ZFS_PROP_QUOTA:
	case ZFS_PROP_RESERVATION:
	case ZFS_PROP_REFQUOTA:
	case ZFS_PROP_REFRESERVATION:
		break;
	default:
		return (-1);
	}

	mos = dd->dd_pool->dp_meta_objset;
	zapobj = dsl_dir_phys(dd)->dd_props_zapobj;
	recvdstr = kmem_asprintf("%s%s", propname, ZPROP_RECVD_SUFFIX);

	version = spa_version(dd->dd_pool->dp_spa);
	if (version < SPA_VERSION_RECVD_PROPS) {
		if (source & ZPROP_SRC_NONE)
			source = ZPROP_SRC_NONE;
		else if (source & ZPROP_SRC_RECEIVED)
			source = ZPROP_SRC_LOCAL;
	}

	switch ((int)source) {
	case ZPROP_SRC_NONE:
		/* Revert to the received value, if any. */
		err = zap_lookup(mos, zapobj, recvdstr, 8, 1, newvalp);
		if (err == ENOENT)
			*newvalp = 0;
		break;
	case ZPROP_SRC_LOCAL:
		*newvalp = value;
		break;
	case ZPROP_SRC_RECEIVED:
		/*
		 * If there's no local setting, then the new received value will
		 * be the effective value.
		 */
		err = zap_lookup(mos, zapobj, propname, 8, 1, newvalp);
		if (err == ENOENT)
			*newvalp = value;
		break;
	case (ZPROP_SRC_NONE | ZPROP_SRC_RECEIVED):
		/*
		 * We're clearing the received value, so the local setting (if
		 * it exists) remains the effective value.
		 */
		err = zap_lookup(mos, zapobj, propname, 8, 1, newvalp);
		if (err == ENOENT)
			*newvalp = 0;
		break;
	default:
		panic("unexpected property source: %d", source);
	}

	strfree(recvdstr);

	if (err == ENOENT)
		return (0);

	return (err);
}
示例#13
0
文件: zfs_ctldir.c 项目: EW1/zfs
int
zfsctl_mount_snapshot(struct path *path, int flags)
{
	struct dentry *dentry = path->dentry;
	struct inode *ip = dentry->d_inode;
	zfs_sb_t *zsb = ITOZSB(ip);
	char *full_name, *full_path;
	zfs_snapentry_t *sep;
	zfs_snapentry_t search;
	char *argv[] = { "/bin/sh", "-c", NULL, NULL };
	char *envp[] = { NULL };
	int error;

	ZFS_ENTER(zsb);

	full_name = kmem_zalloc(MAXNAMELEN, KM_SLEEP);
	full_path = kmem_zalloc(PATH_MAX, KM_SLEEP);

	error = zfsctl_snapshot_zname(ip, dname(dentry), MAXNAMELEN, full_name);
	if (error)
		goto error;

	error = zfsctl_snapshot_zpath(path, PATH_MAX, full_path);
	if (error)
		goto error;

	/*
	 * Attempt to mount the snapshot from user space.  Normally this
	 * would be done using the vfs_kern_mount() function, however that
	 * function is marked GPL-only and cannot be used.  On error we
	 * careful to log the real error to the console and return EISDIR
	 * to safely abort the automount.  This should be very rare.
	 */
	argv[2] = kmem_asprintf(SET_MOUNT_CMD, full_name, full_path);
	error = call_usermodehelper(argv[0], argv, envp, UMH_WAIT_PROC);
	strfree(argv[2]);
	if (error) {
		printk("ZFS: Unable to automount %s at %s: %d\n",
		    full_name, full_path, error);
		error = EISDIR;
		goto error;
	}

	mutex_enter(&zsb->z_ctldir_lock);

	/*
	 * Ensure a previous entry does not exist, if it does safely remove
	 * it any cancel the outstanding expiration.  This can occur when a
	 * snapshot is manually unmounted and then an automount is triggered.
	 */
	search.se_name = full_name;
	sep = avl_find(&zsb->z_ctldir_snaps, &search, NULL);
	if (sep) {
		avl_remove(&zsb->z_ctldir_snaps, sep);
		taskq_cancel_id(zfs_expire_taskq, sep->se_taskqid);
		zfsctl_sep_free(sep);
	}

	sep = zfsctl_sep_alloc();
	sep->se_name = full_name;
	sep->se_path = full_path;
	sep->se_inode = ip;
	avl_add(&zsb->z_ctldir_snaps, sep);

	sep->se_taskqid = taskq_dispatch_delay(zfs_expire_taskq,
	    zfsctl_expire_snapshot, sep, TQ_SLEEP,
	    ddi_get_lbolt() + zfs_expire_snapshot * HZ);

	mutex_exit(&zsb->z_ctldir_lock);
error:
	if (error) {
		kmem_free(full_name, MAXNAMELEN);
		kmem_free(full_path, PATH_MAX);
	}

	ZFS_EXIT(zsb);

	return (error);
}