eb51a9d747
If sufficient memory (<2K, realistically) is available, libzfs_init() can be significantly shorted by iterating over the correct sysfs directory before registrations, we can turn 168 stats into 15/18 syscalls (3 opens (6 if built in), 3 fstats, 6 getdentses, and 3 closes), a tenfoldish reduction; this is probably a bit faster, too. The list is always optional, and registration functions (and one-off users) can simply pass NULL, which will fall back to the previous mechanism Also, don't allocate in zfs_mod_supported_impl, and use use access() instead of stat(), since existence is really what we care about Also, fix pre-prop-checking compat in fallback for built-in ZFS Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Reviewed-by: Tony Nguyen <tony.nguyen@delphix.com> Signed-off-by: Ahelenia Ziemiańska <nabijaczleweli@nabijaczleweli.xyz> Closes #12089
150 lines
5.2 KiB
C
150 lines
5.2 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 2010 Sun Microsystems, Inc. All rights reserved.
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* Use is subject to license terms.
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*/
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#ifndef _ZFS_PROP_H
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#define _ZFS_PROP_H extern __attribute__((visibility("default")))
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#include <sys/fs/zfs.h>
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#include <sys/types.h>
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#include <sys/zfs_sysfs.h>
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#ifdef __cplusplus
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extern "C" {
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#endif
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/*
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* For index types (e.g. compression and checksum), we want the numeric value
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* in the kernel, but the string value in userland.
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*/
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typedef enum {
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PROP_TYPE_NUMBER, /* numeric value */
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PROP_TYPE_STRING, /* string value */
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PROP_TYPE_INDEX /* numeric value indexed by string */
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} zprop_type_t;
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typedef enum {
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PROP_DEFAULT,
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PROP_READONLY,
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PROP_INHERIT,
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/*
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* ONETIME properties are a sort of conglomeration of READONLY
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* and INHERIT. They can be set only during object creation,
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* after that they are READONLY. If not explicitly set during
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* creation, they can be inherited. ONETIME_DEFAULT properties
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* work the same way, but they will default instead of
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* inheriting a value.
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*/
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PROP_ONETIME,
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PROP_ONETIME_DEFAULT
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} zprop_attr_t;
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typedef struct zfs_index {
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const char *pi_name;
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uint64_t pi_value;
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} zprop_index_t;
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typedef struct {
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const char *pd_name; /* human-readable property name */
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int pd_propnum; /* property number */
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zprop_type_t pd_proptype; /* string, boolean, index, number */
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const char *pd_strdefault; /* default for strings */
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uint64_t pd_numdefault; /* for boolean / index / number */
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zprop_attr_t pd_attr; /* default, readonly, inherit */
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int pd_types; /* bitfield of valid dataset types */
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/* fs | vol | snap; or pool */
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const char *pd_values; /* string telling acceptable values */
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const char *pd_colname; /* column header for "zfs list" */
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boolean_t pd_rightalign; /* column alignment for "zfs list" */
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boolean_t pd_visible; /* do we list this property with the */
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/* "zfs get" help message */
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boolean_t pd_zfs_mod_supported; /* supported by running zfs module */
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const zprop_index_t *pd_table; /* for index properties, a table */
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/* defining the possible values */
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size_t pd_table_size; /* number of entries in pd_table[] */
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} zprop_desc_t;
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/*
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* zfs dataset property functions
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*/
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_ZFS_PROP_H void zfs_prop_init(void);
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_ZFS_PROP_H zprop_type_t zfs_prop_get_type(zfs_prop_t);
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_ZFS_PROP_H boolean_t zfs_prop_delegatable(zfs_prop_t prop);
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_ZFS_PROP_H zprop_desc_t *zfs_prop_get_table(void);
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/*
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* zpool property functions
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*/
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_ZFS_PROP_H void zpool_prop_init(void);
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_ZFS_PROP_H zprop_type_t zpool_prop_get_type(zpool_prop_t);
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_ZFS_PROP_H zprop_desc_t *zpool_prop_get_table(void);
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/*
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* vdev property functions
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*/
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_ZFS_PROP_H void vdev_prop_init(void);
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_ZFS_PROP_H zprop_type_t vdev_prop_get_type(vdev_prop_t prop);
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_ZFS_PROP_H zprop_desc_t *vdev_prop_get_table(void);
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/*
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* Common routines to initialize property tables
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*/
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_ZFS_PROP_H void zprop_register_impl(int, const char *, zprop_type_t, uint64_t,
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const char *, zprop_attr_t, int, const char *, const char *,
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boolean_t, boolean_t, const zprop_index_t *,
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const struct zfs_mod_supported_features *);
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_ZFS_PROP_H void zprop_register_string(int, const char *, const char *,
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zprop_attr_t attr, int, const char *, const char *,
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const struct zfs_mod_supported_features *);
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_ZFS_PROP_H void zprop_register_number(int, const char *, uint64_t,
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zprop_attr_t, int, const char *, const char *,
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const struct zfs_mod_supported_features *);
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_ZFS_PROP_H void zprop_register_index(int, const char *, uint64_t, zprop_attr_t,
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int, const char *, const char *, const zprop_index_t *,
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const struct zfs_mod_supported_features *);
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_ZFS_PROP_H void zprop_register_hidden(int, const char *, zprop_type_t,
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zprop_attr_t, int, const char *, const struct zfs_mod_supported_features *);
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/*
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* Common routines for zfs and zpool property management
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*/
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_ZFS_PROP_H int zprop_iter_common(zprop_func, void *, boolean_t, boolean_t,
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zfs_type_t);
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_ZFS_PROP_H int zprop_name_to_prop(const char *, zfs_type_t);
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_ZFS_PROP_H int zprop_string_to_index(int, const char *, uint64_t *,
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zfs_type_t);
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_ZFS_PROP_H int zprop_index_to_string(int, uint64_t, const char **,
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zfs_type_t);
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_ZFS_PROP_H uint64_t zprop_random_value(int, uint64_t, zfs_type_t);
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_ZFS_PROP_H const char *zprop_values(int, zfs_type_t);
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_ZFS_PROP_H size_t zprop_width(int, boolean_t *, zfs_type_t);
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_ZFS_PROP_H boolean_t zprop_valid_for_type(int, zfs_type_t, boolean_t);
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_ZFS_PROP_H int zprop_valid_char(char c);
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#ifdef __cplusplus
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}
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#endif
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#endif /* _ZFS_PROP_H */
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