libspl: add API for manipulating tunables

Sponsored-by: https://despairlabs.com/sponsor/
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Alexander Motin <mav@FreeBSD.org>
Signed-off-by: Rob Norris <robn@despairlabs.com>
Closes #17537
This commit is contained in:
Rob Norris 2025-07-12 11:32:44 +10:00 committed by Brian Behlendorf
parent 967ce75669
commit cb9742e532
5 changed files with 843 additions and 18 deletions

View File

@ -49,4 +49,12 @@ typedef struct zfs_tunable {
const char *zt_desc;
} zfs_tunable_t;
int zfs_tunable_set(const zfs_tunable_t *tunable, const char *val);
int zfs_tunable_get(const zfs_tunable_t *tunable, char *val, size_t valsz);
const zfs_tunable_t *zfs_tunable_lookup(const char *name);
typedef int (*zfs_tunable_iter_t)(const zfs_tunable_t *tunable, void *arg);
void zfs_tunable_iter(zfs_tunable_iter_t cb, void *arg);
#endif

View File

@ -25,6 +25,12 @@
*/
#include <stddef.h>
#include <string.h>
#include <stdlib.h>
#include <stdio.h>
#include <errno.h>
#include <limits.h>
#include <inttypes.h>
#include <sys/tunables.h>
/*
@ -70,3 +76,244 @@ extern const zfs_tunable_t *__stop_zfs_tunables;
static void *__zfs_tunable__placeholder
__attribute__((__section__("zfs_tunables")))
__attribute__((__used__)) = NULL;
/*
* Find the name tunable by walking through the linker set and comparing names,
* as described above. This is not particularly efficient but it's a fairly
* rare task, so it shouldn't be a big deal.
*/
const zfs_tunable_t *
zfs_tunable_lookup(const char *name)
{
for (const zfs_tunable_t **ztp = &__start_zfs_tunables;
ztp != &__stop_zfs_tunables; ztp++) {
const zfs_tunable_t *zt = *ztp;
if (zt == NULL)
continue;
if (strcmp(name, zt->zt_name) == 0)
return (zt);
}
return (NULL);
}
/*
* Like zfs_tunable_lookup, but call the provided callback for each tunable.
*/
void
zfs_tunable_iter(zfs_tunable_iter_t cb, void *arg)
{
for (const zfs_tunable_t **ztp = &__start_zfs_tunables;
ztp != &__stop_zfs_tunables; ztp++) {
const zfs_tunable_t *zt = *ztp;
if (zt == NULL)
continue;
if (cb(zt, arg))
return;
}
}
/*
* Parse a string into an int or uint. It's easier to have a pair of "generic"
* functions that clamp to a given min and max rather than have multiple
* functions for each width of type.
*/
static int
zfs_tunable_parse_int(const char *val, intmax_t *np,
intmax_t min, intmax_t max)
{
intmax_t n;
char *end;
errno = 0;
n = strtoimax(val, &end, 0);
if (errno != 0)
return (errno);
if (*end != '\0')
return (EINVAL);
if (n < min || n > max)
return (ERANGE);
*np = n;
return (0);
}
static int
zfs_tunable_parse_uint(const char *val, uintmax_t *np,
uintmax_t min, uintmax_t max)
{
uintmax_t n;
char *end;
errno = 0;
n = strtoumax(val, &end, 0);
if (errno != 0)
return (errno);
if (*end != '\0')
return (EINVAL);
if (strchr(val, '-'))
return (ERANGE);
if (n < min || n > max)
return (ERANGE);
*np = n;
return (0);
}
/*
* Set helpers for each tunable type. Parses the string, and if produces a
* valid value for the tunable, sets it. No effort is made to make sure the
* tunable is of the right type; that's done in zfs_tunable_set() below.
*/
static int
zfs_tunable_set_int(const zfs_tunable_t *zt, const char *val)
{
intmax_t n;
int err = zfs_tunable_parse_int(val, &n, INT_MIN, INT_MAX);
if (err != 0)
return (err);
*(int *)zt->zt_varp = n;
return (0);
}
static int
zfs_tunable_set_uint(const zfs_tunable_t *zt, const char *val)
{
uintmax_t n;
int err = zfs_tunable_parse_uint(val, &n, 0, UINT_MAX);
if (err != 0)
return (err);
*(unsigned int *)zt->zt_varp = n;
return (0);
}
static int
zfs_tunable_set_ulong(const zfs_tunable_t *zt, const char *val)
{
uintmax_t n;
int err = zfs_tunable_parse_uint(val, &n, 0, ULONG_MAX);
if (err != 0)
return (err);
*(unsigned long *)zt->zt_varp = n;
return (0);
}
static int
zfs_tunable_set_u64(const zfs_tunable_t *zt, const char *val)
{
uintmax_t n;
int err = zfs_tunable_parse_uint(val, &n, 0, UINT64_MAX);
if (err != 0)
return (err);
*(uint64_t *)zt->zt_varp = n;
return (0);
}
static int
zfs_tunable_set_string(const zfs_tunable_t *zt, const char *val)
{
(void) zt, (void) val;
/*
* We can't currently handle strings. String tunables are pointers
* into read-only memory, so we can update the pointer, but not the
* contents. That would mean taking an allocation, but we don't have
* an obvious place to free it.
*
* For now, it's no big deal as there's only a couple of string
* tunables anyway.
*/
return (ENOTSUP);
}
/*
* Get helpers for each tunable type. Converts the value to a string if
* necessary and writes it into the provided buffer. The type is assumed to
* be correct; zfs_tunable_get() below will call the correct function for the
* type.
*/
static int
zfs_tunable_get_int(const zfs_tunable_t *zt, char *val, size_t valsz)
{
snprintf(val, valsz, "%d", *(int *)zt->zt_varp);
return (0);
}
static int
zfs_tunable_get_uint(const zfs_tunable_t *zt, char *val, size_t valsz)
{
snprintf(val, valsz, "%u", *(unsigned int *)zt->zt_varp);
return (0);
}
static int
zfs_tunable_get_ulong(const zfs_tunable_t *zt, char *val, size_t valsz)
{
snprintf(val, valsz, "%lu", *(unsigned long *)zt->zt_varp);
return (0);
}
static int
zfs_tunable_get_u64(const zfs_tunable_t *zt, char *val, size_t valsz)
{
snprintf(val, valsz, "%"PRIu64, *(uint64_t *)zt->zt_varp);
return (0);
}
static int
zfs_tunable_get_string(const zfs_tunable_t *zt, char *val, size_t valsz)
{
strlcpy(val, *(char **)zt->zt_varp, valsz);
return (0);
}
/* The public set function. Delegates to the type-specific version. */
int
zfs_tunable_set(const zfs_tunable_t *zt, const char *val)
{
int err;
switch (zt->zt_type) {
case ZFS_TUNABLE_TYPE_INT:
err = zfs_tunable_set_int(zt, val);
break;
case ZFS_TUNABLE_TYPE_UINT:
err = zfs_tunable_set_uint(zt, val);
break;
case ZFS_TUNABLE_TYPE_ULONG:
err = zfs_tunable_set_ulong(zt, val);
break;
case ZFS_TUNABLE_TYPE_U64:
err = zfs_tunable_set_u64(zt, val);
break;
case ZFS_TUNABLE_TYPE_STRING:
err = zfs_tunable_set_string(zt, val);
break;
default:
err = EOPNOTSUPP;
break;
}
return (err);
}
/* The public get function. Delegates to the type-specific version. */
int
zfs_tunable_get(const zfs_tunable_t *zt, char *val, size_t valsz)
{
int err;
switch (zt->zt_type) {
case ZFS_TUNABLE_TYPE_INT:
err = zfs_tunable_get_int(zt, val, valsz);
break;
case ZFS_TUNABLE_TYPE_UINT:
err = zfs_tunable_get_uint(zt, val, valsz);
break;
case ZFS_TUNABLE_TYPE_ULONG:
err = zfs_tunable_get_ulong(zt, val, valsz);
break;
case ZFS_TUNABLE_TYPE_U64:
err = zfs_tunable_get_u64(zt, val, valsz);
break;
case ZFS_TUNABLE_TYPE_STRING:
err = zfs_tunable_get_string(zt, val, valsz);
break;
default:
err = EOPNOTSUPP;
break;
}
return (err);
}

View File

@ -244,6 +244,10 @@
<elf-symbol name='uu_strerror' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
<elf-symbol name='uu_strndup' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
<elf-symbol name='uu_zalloc' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
<elf-symbol name='zfs_tunable_get' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
<elf-symbol name='zfs_tunable_iter' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
<elf-symbol name='zfs_tunable_lookup' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
<elf-symbol name='zfs_tunable_set' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
</elf-function-symbols>
<abi-instr address-size='64' path='lib/libspl/assert.c' language='LANG_C99'>
<typedef-decl name='__pid_t' type-id='95e97e5e' id='3629bad8'/>
@ -612,7 +616,6 @@
<array-type-def dimensions='1' type-id='de572c22' size-in-bits='1472' id='6d3c2f42'>
<subrange length='23' type-id='7359adad' id='fdd0f594'/>
</array-type-def>
<type-decl name='long long int' size-in-bits='64' id='1eb56b1e'/>
<array-type-def dimensions='1' type-id='3a47d82b' size-in-bits='256' id='a133ec23'>
<subrange length='4' type-id='7359adad' id='16fe7105'/>
</array-type-def>
@ -978,8 +981,6 @@
</abi-instr>
<abi-instr address-size='64' path='lib/libspl/os/linux/gethostid.c' language='LANG_C99'>
<type-decl name='long long unsigned int' size-in-bits='64' id='3a47d82b'/>
<pointer-type-def type-id='26a90f95' size-in-bits='64' id='9b23c9ad'/>
<qualified-type-def type-id='9b23c9ad' restrict='yes' id='8c85230f'/>
<function-decl name='fclose' visibility='default' binding='global' size-in-bits='64'>
<parameter type-id='822cd80b'/>
<return type-id='95e97e5e'/>
@ -1019,6 +1020,13 @@
<array-type-def dimensions='1' type-id='03085adc' size-in-bits='192' id='083f8d58'>
<subrange length='3' type-id='7359adad' id='56f209d2'/>
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<subrange length='12' type-id='7359adad' id='84827bdc'/>
</array-type-def>
<type-decl name='long long int' size-in-bits='64' id='1eb56b1e'/>
<class-decl name='mnttab' size-in-bits='256' is-struct='yes' visibility='default' id='1b055409'>
<data-member access='public' layout-offset-in-bits='0'>
<var-decl name='mnt_special' type-id='26a90f95' visibility='default'/>
@ -1053,6 +1061,93 @@
<var-decl name='mnt_minor' type-id='3502e3ff' visibility='default'/>
</data-member>
</class-decl>
<typedef-decl name='__u16' type-id='8efea9e5' id='d315442e'/>
<typedef-decl name='__s32' type-id='95e97e5e' id='3158a266'/>
<typedef-decl name='__u32' type-id='f0981eeb' id='3f1a6b60'/>
<typedef-decl name='__s64' type-id='1eb56b1e' id='49659421'/>
<typedef-decl name='__u64' type-id='3a47d82b' id='d3130597'/>
<class-decl name='statx_timestamp' size-in-bits='128' is-struct='yes' visibility='default' id='94101016'>
<data-member access='public' layout-offset-in-bits='0'>
<var-decl name='tv_sec' type-id='49659421' visibility='default'/>
</data-member>
<data-member access='public' layout-offset-in-bits='64'>
<var-decl name='tv_nsec' type-id='3f1a6b60' visibility='default'/>
</data-member>
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<var-decl name='stx_mnt_id' type-id='d3130597' visibility='default'/>
</data-member>
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<var-decl name='__spare3' type-id='f63f23b9' visibility='default'/>
</data-member>
</class-decl>
<class-decl name='mntent' size-in-bits='320' is-struct='yes' visibility='default' id='56fe4a37'>
<data-member access='public' layout-offset-in-bits='0'>
<var-decl name='mnt_fsname' type-id='26a90f95' visibility='default'/>
@ -1142,6 +1237,8 @@
<pointer-type-def type-id='1b055409' size-in-bits='64' id='9d424d31'/>
<pointer-type-def type-id='0bbec9cd' size-in-bits='64' id='62f7a03d'/>
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<qualified-type-def type-id='936b8e35' restrict='yes' id='31d265b7'/>
<function-decl name='getmntent_r' visibility='default' binding='global' size-in-bits='64'>
<parameter type-id='e75a27e9'/>
<parameter type-id='3cad23cd'/>
@ -1157,6 +1254,14 @@
<parameter type-id='95e97e5e'/>
<return type-id='26a90f95'/>
</function-decl>
<function-decl name='statx' visibility='default' binding='global' size-in-bits='64'>
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<parameter type-id='9d26089a'/>
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<parameter type-id='f0981eeb'/>
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<parameter type-id='e75a27e9'/>
<parameter type-id='95e97e5e'/>
@ -1307,6 +1412,91 @@
<return type-id='48b5725f'/>
</function-decl>
</abi-instr>
<abi-instr address-size='64' path='lib/libspl/tunables.c' language='LANG_C99'>
<enum-decl name='zfs_tunable_type_t' naming-typedef-id='f50b1525' id='56905369'>
<underlying-type type-id='9cac1fee'/>
<enumerator name='ZFS_TUNABLE_TYPE_INT' value='0'/>
<enumerator name='ZFS_TUNABLE_TYPE_UINT' value='1'/>
<enumerator name='ZFS_TUNABLE_TYPE_ULONG' value='2'/>
<enumerator name='ZFS_TUNABLE_TYPE_U64' value='3'/>
<enumerator name='ZFS_TUNABLE_TYPE_STRING' value='4'/>
</enum-decl>
<typedef-decl name='zfs_tunable_type_t' type-id='56905369' id='f50b1525'/>
<enum-decl name='zfs_tunable_perm_t' naming-typedef-id='ada7336b' id='e80e6ebf'>
<underlying-type type-id='9cac1fee'/>
<enumerator name='ZFS_TUNABLE_PERM_ZMOD_RW' value='0'/>
<enumerator name='ZFS_TUNABLE_PERM_ZMOD_RD' value='1'/>
</enum-decl>
<typedef-decl name='zfs_tunable_perm_t' type-id='e80e6ebf' id='ada7336b'/>
<class-decl name='zfs_tunable' size-in-bits='320' is-struct='yes' visibility='default' id='1a97ee0e'>
<data-member access='public' layout-offset-in-bits='0'>
<var-decl name='zt_name' type-id='80f4b756' visibility='default'/>
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<var-decl name='zt_varp' type-id='eaa32e2f' visibility='default'/>
</data-member>
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<var-decl name='zt_varsz' type-id='b59d7dce' visibility='default'/>
</data-member>
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<var-decl name='zt_type' type-id='f50b1525' visibility='default'/>
</data-member>
<data-member access='public' layout-offset-in-bits='224'>
<var-decl name='zt_perm' type-id='ada7336b' visibility='default'/>
</data-member>
<data-member access='public' layout-offset-in-bits='256'>
<var-decl name='zt_desc' type-id='80f4b756' visibility='default'/>
</data-member>
</class-decl>
<typedef-decl name='zfs_tunable_t' type-id='1a97ee0e' id='12bf5c5e'/>
<typedef-decl name='zfs_tunable_iter_t' type-id='7ef33f92' id='d8d5f4ab'/>
<typedef-decl name='intmax_t' type-id='5b475db0' id='e104d842'/>
<typedef-decl name='uintmax_t' type-id='04d82f4b' id='f8b828c9'/>
<typedef-decl name='__intmax_t' type-id='bd54fe1a' id='5b475db0'/>
<typedef-decl name='__uintmax_t' type-id='7359adad' id='04d82f4b'/>
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<pointer-type-def type-id='92f86508' size-in-bits='64' id='7ef33f92'/>
<function-decl name='strtoimax' visibility='default' binding='global' size-in-bits='64'>
<parameter type-id='9d26089a'/>
<parameter type-id='8c85230f'/>
<parameter type-id='95e97e5e'/>
<return type-id='e104d842'/>
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<parameter type-id='8c85230f'/>
<parameter type-id='95e97e5e'/>
<return type-id='f8b828c9'/>
</function-decl>
<function-decl name='zfs_tunable_lookup' mangled-name='zfs_tunable_lookup' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_tunable_lookup'>
<parameter type-id='80f4b756' name='name'/>
<return type-id='a27af98c'/>
</function-decl>
<function-decl name='zfs_tunable_set' mangled-name='zfs_tunable_set' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_tunable_set'>
<parameter type-id='a27af98c' name='zt'/>
<parameter type-id='80f4b756' name='val'/>
<return type-id='95e97e5e'/>
</function-decl>
<function-decl name='zfs_tunable_get' mangled-name='zfs_tunable_get' visibility='default' binding='global' size-in-bits='64' elf-symbol-id='zfs_tunable_get'>
<parameter type-id='a27af98c' name='zt'/>
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View File

@ -451,6 +451,10 @@
<elf-symbol name='zfs_strip_partition' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
<elf-symbol name='zfs_strip_path' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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@ -1450,8 +1454,103 @@
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@ -1463,6 +1562,14 @@
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@ -1487,6 +1594,89 @@
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<enumerator name='ZFS_TUNABLE_TYPE_U64' value='3'/>
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<typedef-decl name='zfs_tunable_type_t' type-id='56905369' id='f50b1525'/>
<enum-decl name='zfs_tunable_perm_t' naming-typedef-id='ada7336b' id='e80e6ebf'>
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</enum-decl>
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@ -4135,13 +4325,6 @@
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@ -6630,6 +6813,13 @@
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<return type-id='95e97e5e'/>

View File

@ -222,6 +222,10 @@
<elf-symbol name='spl_pagesize' type='func-type' binding='global-binding' visibility='default-visibility' is-defined='yes'/>
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@ -613,7 +617,6 @@
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@ -974,8 +977,6 @@
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@ -987,6 +988,13 @@
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@ -1021,6 +1029,93 @@
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@ -1096,6 +1191,8 @@
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@ -1107,15 +1204,18 @@
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@ -1258,6 +1358,96 @@
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