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zcommon: pre-iterate over sysfs instead of statting every feature

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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
This commit is contained in:
наб
2021-12-17 01:43:10 +01:00
committed by GitHub
parent 8fdc6f618c
commit eb51a9d747
7 changed files with 584 additions and 405 deletions
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include/zfs_prop.h
+10 -5
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@@ -28,6 +28,7 @@
#include <sys/fs/zfs.h>
#include <sys/types.h>
#include <sys/zfs_sysfs.h>
#ifdef __cplusplus
extern "C" {
@@ -111,15 +112,19 @@ _ZFS_PROP_H zprop_desc_t *vdev_prop_get_table(void);
*/
_ZFS_PROP_H void zprop_register_impl(int, const char *, zprop_type_t, uint64_t,
const char *, zprop_attr_t, int, const char *, const char *,
boolean_t, boolean_t, const zprop_index_t *);
boolean_t, boolean_t, const zprop_index_t *,
const struct zfs_mod_supported_features *);
_ZFS_PROP_H void zprop_register_string(int, const char *, const char *,
zprop_attr_t attr, int, const char *, const char *);
zprop_attr_t attr, int, const char *, const char *,
const struct zfs_mod_supported_features *);
_ZFS_PROP_H void zprop_register_number(int, const char *, uint64_t,
zprop_attr_t, int, const char *, const char *);
zprop_attr_t, int, const char *, const char *,
const struct zfs_mod_supported_features *);
_ZFS_PROP_H void zprop_register_index(int, const char *, uint64_t, zprop_attr_t,
int, const char *, const char *, const zprop_index_t *);
int, const char *, const char *, const zprop_index_t *,
const struct zfs_mod_supported_features *);
_ZFS_PROP_H void zprop_register_hidden(int, const char *, zprop_type_t,
zprop_attr_t, int, const char *);
zprop_attr_t, int, const char *, const struct zfs_mod_supported_features *);
/*
* Common routines for zfs and zpool property management