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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
57 lines
1.8 KiB
C
57 lines
1.8 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 (c) 2018 by Delphix. All rights reserved.
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*/
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#ifndef _SYS_ZFS_SYSFS_H
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#define _SYS_ZFS_SYSFS_H extern __attribute__((visibility("default")))
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struct zfs_mod_supported_features;
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struct zfs_mod_supported_features *zfs_mod_list_supported(const char *scope);
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void zfs_mod_list_supported_free(struct zfs_mod_supported_features *);
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#ifdef _KERNEL
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void zfs_sysfs_init(void);
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void zfs_sysfs_fini(void);
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#else
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#define zfs_sysfs_init()
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#define zfs_sysfs_fini()
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_SYS_ZFS_SYSFS_H boolean_t zfs_mod_supported(const char *, const char *,
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const struct zfs_mod_supported_features *);
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#endif
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#define ZFS_SYSFS_POOL_PROPERTIES "properties.pool"
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#define ZFS_SYSFS_VDEV_PROPERTIES "properties.vdev"
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#define ZFS_SYSFS_DATASET_PROPERTIES "properties.dataset"
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#define ZFS_SYSFS_KERNEL_FEATURES "features.kernel"
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#define ZFS_SYSFS_POOL_FEATURES "features.pool"
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#define ZFS_SYSFS_DIR "/sys/module/zfs"
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/* Alternate location when ZFS is built as part of the kernel (rare) */
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#define ZFS_SYSFS_ALT_DIR "/sys/fs/zfs"
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#endif /* _SYS_ZFS_SYSFS_H */
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