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a7ed98d8b5
Datasets that are deeply nested (~100 levels) are impractical. We just
put a limit of 50 levels to newly created datasets. Existing datasets
should work without a problem.
The problem can be seen by attempting to create a dataset using the -p
option with many levels:
panic[cpu0]/thread=ffffff01cd282c20: BAD TRAP: type=8 (#df Double fault) rp=ffffffff
fffffffffbc3aa60 unix:die+100 ()
fffffffffbc3ab70 unix:trap+157d ()
ffffff00083d7020 unix:_patch_xrstorq_rbx+196 ()
ffffff00083d7050 zfs:dbuf_rele+2e ()
...
ffffff00083d7080 zfs:dsl_dir_close+32 ()
ffffff00083d70b0 zfs:dsl_dir_evict+30 ()
ffffff00083d70d0 zfs:dbuf_evict_user+4a ()
ffffff00083d7100 zfs:dbuf_rele_and_unlock+87 ()
ffffff00083d7130 zfs:dbuf_rele+2e ()
... The block above repeats once per directory in the ...
... create -p command, working towards the root ...
ffffff00083db9f0 zfs:dsl_dataset_drop_ref+19 ()
ffffff00083dba20 zfs:dsl_dataset_rele+42 ()
ffffff00083dba70 zfs:dmu_objset_prefetch+e4 ()
ffffff00083dbaa0 zfs:findfunc+23 ()
ffffff00083dbb80 zfs:dmu_objset_find_spa+38c ()
ffffff00083dbbc0 zfs:dmu_objset_find+40 ()
ffffff00083dbc20 zfs:zfs_ioc_snapshot_list_next+4b ()
ffffff00083dbcc0 zfs:zfsdev_ioctl+347 ()
ffffff00083dbd00 genunix:cdev_ioctl+45 ()
ffffff00083dbd40 specfs:spec_ioctl+5a ()
ffffff00083dbdc0 genunix:fop_ioctl+7b ()
ffffff00083dbec0 genunix:ioctl+18e ()
ffffff00083dbf10 unix:brand_sys_sysenter+1c9 ()
Porting notes:
* Added zfs_max_dataset_nesting module option with documentation.
* Updated zfs_rename_014_neg.ksh for Linux.
* Increase the zfs.sh stack warning to 15K. Enough time has passed
that 16K can be reasonably assumed to be the default value. It
was increased in the 3.15 kernel released in June of 2014.
Authored by: Serapheim Dimitropoulos <serapheim.dimitro@delphix.com>
Reviewed by: John Kennedy <john.kennedy@delphix.com>
Reviewed by: Matt Ahrens <matt@delphix.com>
Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Approved by: Garrett D'Amore <garrett@damore.org>
OpenZFS-issue: https://www.illumos.org/issues/9330
OpenZFS-commit: https://github.com/openzfs/openzfs/commit/757a75a
Closes #7681
67 lines
2.2 KiB
C
67 lines
2.2 KiB
C
/*
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* CDDL HEADER START
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*
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* The contents of this file are subject to the terms of the
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* Common Development and Distribution License (the "License").
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* You may not use this file except in compliance with the License.
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*
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* You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
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* or http://www.opensolaris.org/os/licensing.
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* See the License for the specific language governing permissions
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* and limitations under the License.
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*
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* When distributing Covered Code, include this CDDL HEADER in each
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* file and include the License file at usr/src/OPENSOLARIS.LICENSE.
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* If applicable, add the following below this CDDL HEADER, with the
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* fields enclosed by brackets "[]" replaced with your own identifying
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* information: Portions Copyright [yyyy] [name of copyright owner]
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*
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* CDDL HEADER END
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*/
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/*
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* Copyright 2009 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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/*
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* Copyright (c) 2013, 2016 by Delphix. All rights reserved.
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*/
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#ifndef _ZFS_NAMECHECK_H
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#define _ZFS_NAMECHECK_H
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#ifdef __cplusplus
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extern "C" {
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#endif
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typedef enum {
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NAME_ERR_LEADING_SLASH, /* name begins with leading slash */
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NAME_ERR_EMPTY_COMPONENT, /* name contains an empty component */
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NAME_ERR_TRAILING_SLASH, /* name ends with a slash */
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NAME_ERR_INVALCHAR, /* invalid character found */
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NAME_ERR_MULTIPLE_DELIMITERS, /* multiple '@'/'#' delimiters found */
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NAME_ERR_NOLETTER, /* pool doesn't begin with a letter */
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NAME_ERR_RESERVED, /* entire name is reserved */
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NAME_ERR_DISKLIKE, /* reserved disk name (c[0-9].*) */
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NAME_ERR_TOOLONG, /* name is too long */
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NAME_ERR_NO_AT, /* permission set is missing '@' */
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} namecheck_err_t;
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#define ZFS_PERMSET_MAXLEN 64
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extern int zfs_max_dataset_nesting;
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int get_dataset_depth(const char *);
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int pool_namecheck(const char *, namecheck_err_t *, char *);
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int entity_namecheck(const char *, namecheck_err_t *, char *);
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int dataset_namecheck(const char *, namecheck_err_t *, char *);
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int dataset_nestcheck(const char *);
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int mountpoint_namecheck(const char *, namecheck_err_t *);
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int zfs_component_namecheck(const char *, namecheck_err_t *, char *);
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int permset_namecheck(const char *, namecheck_err_t *, char *);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ZFS_NAMECHECK_H */
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