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libudev: hide definition of struct udev_list from other libudev components 

In the later commit, udev_list will be just a wrapper of hashmap or LIST.
So, allocating udev_list does not increase much cost.
This commit is contained in:
Yu Watanabe 2019-06-12 13:03:19 +09:00
parent 337405d439
commit dcf557f7b0
7 changed files with 116 additions and 70 deletions
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8
src/libudev/libudev-device-internal.h
View File

@ -23,16 +23,16 @@ struct udev_device {
struct udev_device *parent;
bool parent_set;
struct udev_list properties;
struct udev_list *properties;
uint64_t properties_generation;
struct udev_list tags;
struct udev_list *tags;
uint64_t tags_generation;
struct udev_list devlinks;
struct udev_list *devlinks;
uint64_t devlinks_generation;
bool properties_read:1;
bool tags_read:1;
bool devlinks_read:1;
struct udev_list sysattrs;
struct udev_list *sysattrs;
bool sysattrs_read;
};

55
src/libudev/libudev-device.c
View File

@ -168,10 +168,24 @@ _public_ const char *udev_device_get_property_value(struct udev_device *udev_dev
}
struct udev_device *udev_device_new(struct udev *udev, sd_device *device) {
_cleanup_(udev_list_freep) struct udev_list *properties = NULL, *tags = NULL, *sysattrs = NULL, *devlinks = NULL;
struct udev_device *udev_device;
assert(device);
properties = udev_list_new(true);
if (!properties)
return_with_errno(NULL, ENOMEM);
tags = udev_list_new(true);
if (!tags)
return_with_errno(NULL, ENOMEM);
sysattrs = udev_list_new(true);
if (!sysattrs)
return_with_errno(NULL, ENOMEM);
devlinks = udev_list_new(true);
if (!devlinks)
return_with_errno(NULL, ENOMEM);
udev_device = new(struct udev_device, 1);
if (!udev_device)
return_with_errno(NULL, ENOMEM);
@ -180,13 +194,12 @@ struct udev_device *udev_device_new(struct udev *udev, sd_device *device) {
.n_ref = 1,
.udev = udev,
.device = sd_device_ref(device),
.properties = TAKE_PTR(properties),
.tags = TAKE_PTR(tags),
.sysattrs = TAKE_PTR(sysattrs),
.devlinks = TAKE_PTR(devlinks),
};
udev_list_init(&udev_device->properties, true);
udev_list_init(&udev_device->tags, true);
udev_list_init(&udev_device->sysattrs, true);
udev_list_init(&udev_device->devlinks, true);
return udev_device;
}
@ -429,10 +442,10 @@ static struct udev_device *udev_device_free(struct udev_device *udev_device) {
sd_device_unref(udev_device->device);
udev_device_unref(udev_device->parent);
udev_list_cleanup(&udev_device->properties);
udev_list_cleanup(&udev_device->sysattrs);
udev_list_cleanup(&udev_device->tags);
udev_list_cleanup(&udev_device->devlinks);
udev_list_free(udev_device->properties);
udev_list_free(udev_device->sysattrs);
udev_list_free(udev_device->tags);
udev_list_free(udev_device->devlinks);
return mfree(udev_device);
}
@ -587,17 +600,17 @@ _public_ struct udev_list_entry *udev_device_get_devlinks_list_entry(struct udev
!udev_device->devlinks_read) {
const char *devlink;
udev_list_cleanup(&udev_device->devlinks);
udev_list_cleanup(udev_device->devlinks);
FOREACH_DEVICE_DEVLINK(udev_device->device, devlink)
if (!udev_list_entry_add(&udev_device->devlinks, devlink, NULL))
if (!udev_list_entry_add(udev_device->devlinks, devlink, NULL))
return_with_errno(NULL, ENOMEM);
udev_device->devlinks_read = true;
udev_device->devlinks_generation = device_get_devlinks_generation(udev_device->device);
}
return udev_list_get_entry(&udev_device->devlinks);
return udev_list_get_entry(udev_device->devlinks);
}
/**
@ -619,17 +632,17 @@ _public_ struct udev_list_entry *udev_device_get_properties_list_entry(struct ud
!udev_device->properties_read) {
const char *key, *value;
udev_list_cleanup(&udev_device->properties);
udev_list_cleanup(udev_device->properties);
FOREACH_DEVICE_PROPERTY(udev_device->device, key, value)
if (!udev_list_entry_add(&udev_device->properties, key, value))
if (!udev_list_entry_add(udev_device->properties, key, value))
return_with_errno(NULL, ENOMEM);
udev_device->properties_read = true;
udev_device->properties_generation = device_get_properties_generation(udev_device->device);
}
return udev_list_get_entry(&udev_device->properties);
return udev_list_get_entry(udev_device->properties);
}
/**
@ -739,16 +752,16 @@ _public_ struct udev_list_entry *udev_device_get_sysattr_list_entry(struct udev_
if (!udev_device->sysattrs_read) {
const char *sysattr;
udev_list_cleanup(&udev_device->sysattrs);
udev_list_cleanup(udev_device->sysattrs);
FOREACH_DEVICE_SYSATTR(udev_device->device, sysattr)
if (!udev_list_entry_add(&udev_device->sysattrs, sysattr, NULL))
if (!udev_list_entry_add(udev_device->sysattrs, sysattr, NULL))
return_with_errno(NULL, ENOMEM);
udev_device->sysattrs_read = true;
}
return udev_list_get_entry(&udev_device->sysattrs);
return udev_list_get_entry(udev_device->sysattrs);
}
/**
@ -794,17 +807,17 @@ _public_ struct udev_list_entry *udev_device_get_tags_list_entry(struct udev_dev
!udev_device->tags_read) {
const char *tag;
udev_list_cleanup(&udev_device->tags);
udev_list_cleanup(udev_device->tags);
FOREACH_DEVICE_TAG(udev_device->device, tag)
if (!udev_list_entry_add(&udev_device->tags, tag, NULL))
if (!udev_list_entry_add(udev_device->tags, tag, NULL))
return_with_errno(NULL, ENOMEM);
udev_device->tags_read = true;
udev_device->tags_generation = device_get_tags_generation(udev_device->device);
}
return udev_list_get_entry(&udev_device->tags);
return udev_list_get_entry(udev_device->tags);
}
/**

18
src/libudev/libudev-enumerate.c
View File

@ -34,7 +34,7 @@
struct udev_enumerate {
struct udev *udev;
unsigned n_ref;
struct udev_list devices_list;
struct udev_list *devices_list;
bool devices_uptodate:1;
sd_device_enumerator *enumerator;
@ -50,6 +50,7 @@ struct udev_enumerate {
**/
_public_ struct udev_enumerate *udev_enumerate_new(struct udev *udev) {
_cleanup_(sd_device_enumerator_unrefp) sd_device_enumerator *e = NULL;
_cleanup_(udev_list_freep) struct udev_list *list = NULL;
struct udev_enumerate *udev_enumerate;
int r;
@ -61,6 +62,10 @@ _public_ struct udev_enumerate *udev_enumerate_new(struct udev *udev) {
if (r < 0)
return_with_errno(NULL, r);
list = udev_list_new(false);
if (!list)
return_with_errno(NULL, ENOMEM);
udev_enumerate = new(struct udev_enumerate, 1);
if (!udev_enumerate)
return_with_errno(NULL, ENOMEM);
@ -69,17 +74,16 @@ _public_ struct udev_enumerate *udev_enumerate_new(struct udev *udev) {
.udev = udev,
.n_ref = 1,
.enumerator = TAKE_PTR(e),
.devices_list = TAKE_PTR(list),
};
udev_list_init(&udev_enumerate->devices_list, false);
return udev_enumerate;
}
static struct udev_enumerate *udev_enumerate_free(struct udev_enumerate *udev_enumerate) {
assert(udev_enumerate);
udev_list_cleanup(&udev_enumerate->devices_list);
udev_list_free(udev_enumerate->devices_list);
sd_device_enumerator_unref(udev_enumerate->enumerator);
return mfree(udev_enumerate);
}
@ -134,7 +138,7 @@ _public_ struct udev_list_entry *udev_enumerate_get_list_entry(struct udev_enume
if (!udev_enumerate->devices_uptodate) {
sd_device *device;
udev_list_cleanup(&udev_enumerate->devices_list);
udev_list_cleanup(udev_enumerate->devices_list);
FOREACH_DEVICE_AND_SUBSYSTEM(udev_enumerate->enumerator, device) {
const char *syspath;
@ -144,14 +148,14 @@ _public_ struct udev_list_entry *udev_enumerate_get_list_entry(struct udev_enume
if (r < 0)
return_with_errno(NULL, r);
if (!udev_list_entry_add(&udev_enumerate->devices_list, syspath, NULL))
if (!udev_list_entry_add(udev_enumerate->devices_list, syspath, NULL))
return_with_errno(NULL, ENOMEM);
}
udev_enumerate->devices_uptodate = true;
}
e = udev_list_get_entry(&udev_enumerate->devices_list);
e = udev_list_get_entry(udev_enumerate->devices_list);
if (!e)
return_with_errno(NULL, ENODATA);

18
src/libudev/libudev-hwdb.c
View File

@ -23,7 +23,7 @@
struct udev_hwdb {
unsigned n_ref;
sd_hwdb *hwdb;
struct udev_list properties_list;
struct udev_list *properties_list;
};
/**
@ -35,6 +35,7 @@ struct udev_hwdb {
* Returns: a hwdb context.
**/
_public_ struct udev_hwdb *udev_hwdb_new(struct udev *udev) {
_cleanup_(udev_list_freep) struct udev_list *list = NULL;
_cleanup_(sd_hwdb_unrefp) sd_hwdb *hwdb_internal = NULL;
struct udev_hwdb *hwdb;
int r;
@ -43,6 +44,10 @@ _public_ struct udev_hwdb *udev_hwdb_new(struct udev *udev) {
if (r < 0)
return_with_errno(NULL, r);
list = udev_list_new(true);
if (!list)
return_with_errno(NULL, ENOMEM);
hwdb = new(struct udev_hwdb, 1);
if (!hwdb)
return_with_errno(NULL, ENOMEM);
@ -50,10 +55,9 @@ _public_ struct udev_hwdb *udev_hwdb_new(struct udev *udev) {
*hwdb = (struct udev_hwdb) {
.n_ref = 1,
.hwdb = TAKE_PTR(hwdb_internal),
.properties_list = TAKE_PTR(list),
};
udev_list_init(&hwdb->properties_list, true);
return hwdb;
}
@ -61,7 +65,7 @@ static struct udev_hwdb *udev_hwdb_free(struct udev_hwdb *hwdb) {
assert(hwdb);
sd_hwdb_unref(hwdb->hwdb);
udev_list_cleanup(&hwdb->properties_list);
udev_list_free(hwdb->properties_list);
return mfree(hwdb);
}
@ -105,13 +109,13 @@ _public_ struct udev_list_entry *udev_hwdb_get_properties_list_entry(struct udev
assert_return_errno(hwdb, NULL, EINVAL);
assert_return_errno(modalias, NULL, EINVAL);
udev_list_cleanup(&hwdb->properties_list);
udev_list_cleanup(hwdb->properties_list);
SD_HWDB_FOREACH_PROPERTY(hwdb->hwdb, modalias, key, value)
if (!udev_list_entry_add(&hwdb->properties_list, key, value))
if (!udev_list_entry_add(hwdb->properties_list, key, value))
return_with_errno(NULL, ENOMEM);
e = udev_list_get_entry(&hwdb->properties_list);
e = udev_list_get_entry(hwdb->properties_list);
if (!e)
return_with_errno(NULL, ENODATA);

17
src/libudev/libudev-list-internal.h
View File

@ -3,19 +3,14 @@
#include "libudev.h"
struct udev_list_node {
struct udev_list_node *next, *prev;
};
#include "macro.h"
struct udev_list {
struct udev_list_node node;
struct udev_list_entry **entries;
unsigned entries_cur;
unsigned entries_max;
bool unique;
};
struct udev_list;
void udev_list_init(struct udev_list *list, bool unique);
struct udev_list *udev_list_new(bool unique);
void udev_list_cleanup(struct udev_list *list);
struct udev_list *udev_list_free(struct udev_list *list);
DEFINE_TRIVIAL_CLEANUP_FUNC(struct udev_list *, udev_list_free);
struct udev_list_entry *udev_list_get_entry(struct udev_list *list);
struct udev_list_entry *udev_list_entry_add(struct udev_list *list, const char *name, const char *value);

40
src/libudev/libudev-list.c
View File

@ -16,6 +16,10 @@
* Libudev list operations.
*/
struct udev_list_node {
struct udev_list_node *next, *prev;
};
/**
* udev_list_entry:
*
@ -29,6 +33,14 @@ struct udev_list_entry {
char *value;
};
struct udev_list {
struct udev_list_node node;
struct udev_list_entry **entries;
unsigned entries_cur;
unsigned entries_max;
bool unique;
};
/* the list's head points to itself if empty */
static void udev_list_node_init(struct udev_list_node *list) {
list->next = list;
@ -64,10 +76,20 @@ static struct udev_list_entry *list_node_to_entry(struct udev_list_node *node) {
return container_of(node, struct udev_list_entry, node);
}
void udev_list_init(struct udev_list *list, bool unique) {
memzero(list, sizeof(struct udev_list));
list->unique = unique;
struct udev_list *udev_list_new(bool unique) {
struct udev_list *list;
list = new(struct udev_list, 1);
if (!list)
return NULL;
*list = (struct udev_list) {
.unique = unique,
};
udev_list_node_init(&list->node);
return list;
}
/* insert entry into a list as the last element */
@ -211,8 +233,7 @@ static void udev_list_entry_delete(struct udev_list_entry *entry) {
entry = tmp, tmp = udev_list_entry_get_next(tmp))
void udev_list_cleanup(struct udev_list *list) {
struct udev_list_entry *entry_loop;
struct udev_list_entry *entry_tmp;
struct udev_list_entry *entry_loop, *entry_tmp;
list->entries = mfree(list->entries);
list->entries_cur = 0;
@ -221,6 +242,15 @@ void udev_list_cleanup(struct udev_list *list) {
udev_list_entry_delete(entry_loop);
}
struct udev_list *udev_list_free(struct udev_list *list) {
if (!list)
return NULL;
udev_list_cleanup(list);
return mfree(list);
}
struct udev_list_entry *udev_list_get_entry(struct udev_list *list) {
if (udev_list_node_is_empty(&list->node))
return NULL;

30
src/test/test-libudev.c
View File

@ -433,19 +433,20 @@ static void test_util_resolve_subsys_kernel(void) {
}
static void test_list(void) {
struct udev_list list = {};
_cleanup_(udev_list_freep) struct udev_list *list = NULL;
struct udev_list_entry *e;
/* empty list */
udev_list_init(&list, false);
assert_se(!udev_list_get_entry(&list));
assert_se(list = udev_list_new(false));
assert_se(!udev_list_get_entry(list));
list = udev_list_free(list);
/* unique == false */
udev_list_init(&list, false);
assert_se(udev_list_entry_add(&list, "aaa", "hoge"));
assert_se(udev_list_entry_add(&list, "aaa", "hogehoge"));
assert_se(udev_list_entry_add(&list, "bbb", "foo"));
e = udev_list_get_entry(&list);
assert_se(list = udev_list_new(false));
assert_se(udev_list_entry_add(list, "aaa", "hoge"));
assert_se(udev_list_entry_add(list, "aaa", "hogehoge"));
assert_se(udev_list_entry_add(list, "bbb", "foo"));
e = udev_list_get_entry(list);
assert_se(e);
assert_se(streq_ptr(udev_list_entry_get_name(e), "aaa"));
assert_se(streq_ptr(udev_list_entry_get_value(e), "hoge"));
@ -462,14 +463,14 @@ static void test_list(void) {
assert_se(!udev_list_entry_get_by_name(e, "aaa"));
assert_se(!udev_list_entry_get_by_name(e, "bbb"));
assert_se(!udev_list_entry_get_by_name(e, "ccc"));
udev_list_cleanup(&list);
list = udev_list_free(list);
/* unique == true */
udev_list_init(&list, true);
assert_se(udev_list_entry_add(&list, "aaa", "hoge"));
assert_se(udev_list_entry_add(&list, "aaa", "hogehoge"));
assert_se(udev_list_entry_add(&list, "bbb", "foo"));
e = udev_list_get_entry(&list);
assert_se(list = udev_list_new(true));
assert_se(udev_list_entry_add(list, "aaa", "hoge"));
assert_se(udev_list_entry_add(list, "aaa", "hogehoge"));
assert_se(udev_list_entry_add(list, "bbb", "foo"));
e = udev_list_get_entry(list);
assert_se(e);
assert_se(streq_ptr(udev_list_entry_get_name(e), "aaa"));
assert_se(streq_ptr(udev_list_entry_get_value(e), "hogehoge"));
@ -487,7 +488,6 @@ static void test_list(void) {
assert_se(streq_ptr(udev_list_entry_get_name(e), "aaa"));
assert_se(streq_ptr(udev_list_entry_get_value(e), "hogehoge"));
assert_se(!udev_list_entry_get_by_name(e, "ccc"));
udev_list_cleanup(&list);
}
static int parse_args(int argc, char *argv[], const char **syspath, const char **subsystem) {