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Various fixes & restructure to extract common code.

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This commit is contained in:
Alasdair Kergon 2001-12-05 16:41:52 +00:00
parent 9ade33a235
commit 638754e559
6 changed files with 224 additions and 167 deletions
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4
libdm/Makefile.in
View File

@ -9,7 +9,9 @@ top_srcdir = @top_srcdir@
VPATH = @srcdir@ VPATH = @srcdir@
interface = @interface@ interface = @interface@
SOURCES=$(interface)/libdevmapper.c SOURCES=$(interface)/libdevmapper.c libdm-common.c
INCLUDES=-I$(interface)
TARGETS=$(interface)/libdevmapper.so TARGETS=$(interface)/libdevmapper.so

181
libdm/ioctl/libdevmapper.c
View File

@ -14,74 +14,17 @@
#include <fcntl.h> #include <fcntl.h>
#include <sys/stat.h> #include <sys/stat.h>
#include <sys/types.h> #include <sys/types.h>
#include <sys/ioctl.h>
#include <errno.h> #include <errno.h>
#include <linux/dm-ioctl.h>
#include <linux/kdev_t.h> #include <linux/kdev_t.h>
#define DEV_DIR "/dev/" #include <sys/ioctl.h>
#include <linux/dm-ioctl.h>
#include "libdm-targets.h"
#include "libdm-common.h"
#define ALIGNMENT sizeof(int) #define ALIGNMENT sizeof(int)
static char _dm_dir[PATH_MAX] = DEV_DIR DM_DIR;
/*
* Library users can provide their own logging
* function.
*/
static void _default_log(int level, const char *file, int line,
const char *f, ...)
{
va_list ap;
va_start(ap, f);
vfprintf(stderr, f, ap);
va_end(ap);
fprintf(stderr, "\n");
}
static dm_log_fn _log = _default_log;
void dm_log_init(dm_log_fn fn)
{
_log = fn;
}
#define log(msg, x...) _log(1, __FILE__, __LINE__, msg, ## x)
struct target {
unsigned long long start;
unsigned long long length;
char *type;
char *params;
struct target *next;
};
struct dm_task {
int type;
char *dev_name;
struct target *head, *tail;
struct dm_ioctl *dmi;
};
struct dm_task *dm_task_create(int type)
{
struct dm_task *dmt = malloc(sizeof(*dmt));
if (!dmt)
return NULL;
memset(dmt, 0, sizeof(*dmt));
dmt->type = type;
return dmt;
}
void dm_task_destroy(struct dm_task *dmt) void dm_task_destroy(struct dm_task *dmt)
{ {
struct target *t, *n; struct target *t, *n;
@ -97,14 +40,6 @@ void dm_task_destroy(struct dm_task *dmt)
free(dmt); free(dmt);
} }
int dm_task_set_name(struct dm_task *dmt, const char *name)
{
if (dmt->dev_name)
free(dmt->dev_name);
return (dmt->dev_name = strdup(name)) ? 1 : 0;
}
int dm_task_get_info(struct dm_task *dmt, struct dm_info *info) int dm_task_get_info(struct dm_task *dmt, struct dm_info *info)
{ {
if (!dmt->dmi) if (!dmt->dmi)
@ -119,23 +54,26 @@ int dm_task_get_info(struct dm_task *dmt, struct dm_info *info)
return 1; return 1;
} }
static struct target *_create_target(unsigned long long start, struct target *create_target(uint64_t start,
unsigned long long len, uint64_t len,
const char *type, const char *params) const char *type, const char *params)
{ {
struct target *t = malloc(sizeof(*t)); struct target *t = malloc(sizeof(*t));
if (!t) if (!t) {
log("create_target: malloc(%d) failed", sizeof(*t));
return NULL; return NULL;
}
memset(t, 0, sizeof(*t)); memset(t, 0, sizeof(*t));
if (!(t->params = strdup(params))) { if (!(t->params = strdup(params))) {
log("Out of memory"); log("create_target: strdup(params) failed");
goto bad; goto bad;
} }
if (!(t->type = strdup(type))) { if (!(t->type = strdup(type))) {
log("Out of memory"); log("create_target: strdup(type) failed");
goto bad; goto bad;
} }
@ -150,27 +88,6 @@ static struct target *_create_target(unsigned long long start,
return NULL; return NULL;
} }
int dm_task_add_target(struct dm_task *dmt,
unsigned long long start,
unsigned long long size,
const char *ttype,
const char *params)
{
struct target *t = _create_target(start, size, ttype, params);
if (!t)
return 0;
if (!dmt->head)
dmt->head = dmt->tail = t;
else {
dmt->tail->next = t;
dmt->tail = t;
}
return 1;
}
static void *_align(void *ptr, unsigned int align) static void *_align(void *ptr, unsigned int align)
{ {
align--; align--;
@ -254,60 +171,6 @@ static struct dm_ioctl *_flatten(struct dm_task *dmt)
return NULL; return NULL;
} }
static void _build_dev_path(char *buffer, size_t len, const char *dev_name)
{
snprintf(buffer, len, "/dev/%s/%s", DM_DIR, dev_name);
}
static int _add_dev_node(const char *dev_name, dev_t dev)
{
char path[PATH_MAX];
struct stat info;
_build_dev_path(path, sizeof(path), dev_name);
if (stat(path, &info) >= 0) {
if (!S_ISBLK(info.st_mode)) {
log("A non-block device file at '%s' "
"is already present", path);
return 0;
}
if (info.st_rdev == dev)
return 1;
if (unlink(path) < 0) {
log("Unable to unlink device node for '%s'", dev_name);
return 0;
}
}
if (mknod(path, S_IFBLK | S_IRUSR | S_IWUSR | S_IRGRP, dev) < 0) {
log("Unable to make device node for '%s'", dev_name);
return 0;
}
return 1;
}
static int _rm_dev_node(const char *dev_name)
{
char path[PATH_MAX];
struct stat info;
_build_dev_path(path, sizeof(path), dev_name);
if (stat(path, &info) < 0)
return 1;
if (unlink(path) < 0) {
log("Unable to unlink device node for '%s'", dev_name);
return 0;
}
return 1;
}
int dm_task_run(struct dm_task *dmt) int dm_task_run(struct dm_task *dmt)
{ {
int fd = -1; int fd = -1;
@ -320,7 +183,7 @@ int dm_task_run(struct dm_task *dmt)
return 0; return 0;
} }
snprintf(control, sizeof(control), "%s/control", _dm_dir); snprintf(control, sizeof(control), "%s/control", dm_dir());
if ((fd = open(control, O_RDWR)) < 0) { if ((fd = open(control, O_RDWR)) < 0) {
log("Couldn't open device-mapper control device"); log("Couldn't open device-mapper control device");
@ -366,11 +229,11 @@ int dm_task_run(struct dm_task *dmt)
switch (dmt->type) { switch (dmt->type) {
case DM_DEVICE_CREATE: case DM_DEVICE_CREATE:
_add_dev_node(dmt->dev_name, MKDEV(dmi->major, dmi->minor)); add_dev_node(dmt->dev_name, MKDEV(dmi->major, dmi->minor));
break; break;
case DM_DEVICE_REMOVE: case DM_DEVICE_REMOVE:
_rm_dev_node(dmt->dev_name); rm_dev_node(dmt->dev_name);
break; break;
} }
@ -384,13 +247,3 @@ int dm_task_run(struct dm_task *dmt)
return 0; return 0;
} }
int dm_set_dev_dir(const char *dir)
{
snprintf(_dm_dir, sizeof(_dm_dir), "%s%s", dir, DM_DIR);
return 1;
}
const char *dm_dir(void)
{
return _dm_dir;
}

24
libdm/ioctl/libdm-targets.h Normal file
View File

@ -0,0 +1,24 @@
/*
* Copyright (C) 2001 Sistina Software (UK) Limited.
*
* This file is released under the LGPL.
*/
struct target {
uint64_t start;
uint64_t length;
char *type;
char *params;
struct target *next;
};
struct dm_task {
int type;
char *dev_name;
struct target *head, *tail;
struct dm_ioctl *dmi;
};

6
libdm/libdevmapper.h
View File

@ -7,6 +7,8 @@
#ifndef LIB_DEVICE_MAPPER_H #ifndef LIB_DEVICE_MAPPER_H
#define LIB_DEVICE_MAPPER_H #define LIB_DEVICE_MAPPER_H
#include <inttypes.h>
/* /*
* Since it is quite laborious to build the ioctl * Since it is quite laborious to build the ioctl
* arguments for the device-mapper people are * arguments for the device-mapper people are
@ -64,8 +66,8 @@ int dm_task_get_info(struct dm_task *dmt, struct dm_info *dmi);
* Use these to prepare for a create or reload. * Use these to prepare for a create or reload.
*/ */
int dm_task_add_target(struct dm_task *dmt, int dm_task_add_target(struct dm_task *dmt,
unsigned long long start, uint64_t start,
unsigned long long size, uint64_t size,
const char *ttype, const char *ttype,
const char *params); const char *params);

160
libdm/libdm-common.c Normal file
View File

@ -0,0 +1,160 @@
/*
* Copyright (C) 2001 Sistina Software (UK) Limited.
*
* This file is released under the LGPL.
*/
#include "libdevmapper.h"
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/param.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <errno.h>
#include <linux/kdev_t.h>
#include <linux/device-mapper.h>
#include "libdm-targets.h"
#include "libdm-common.h"
#define DEV_DIR "/dev/"
static char _dm_dir[PATH_MAX] = DEV_DIR DM_DIR;
/*
* Library users can provide their own logging
* function.
*/
void _default_log(int level, const char *file, int line,
const char *f, ...)
{
va_list ap;
va_start(ap, f);
vfprintf(stderr, f, ap);
va_end(ap);
fprintf(stderr, "\n");
}
dm_log_fn _log = _default_log;
void dm_log_init(dm_log_fn fn)
{
_log = fn;
}
struct dm_task *dm_task_create(int type)
{
struct dm_task *dmt = malloc(sizeof(*dmt));
if (!dmt) {
log("dm_task_create: malloc(%d) failed", sizeof(*dmt));
return NULL;
}
memset(dmt, 0, sizeof(*dmt));
dmt->type = type;
return dmt;
}
int dm_task_set_name(struct dm_task *dmt, const char *name)
{
if (dmt->dev_name)
free(dmt->dev_name);
return (dmt->dev_name = strdup(name)) ? 1 : 0;
}
int dm_task_add_target(struct dm_task *dmt,
uint64_t start,
uint64_t size,
const char *ttype,
const char *params)
{
struct target *t = create_target(start, size, ttype, params);
if (!t)
return 0;
if (!dmt->head)
dmt->head = dmt->tail = t;
else {
dmt->tail->next = t;
dmt->tail = t;
}
return 1;
}
void _build_dev_path(char *buffer, size_t len, const char *dev_name)
{
snprintf(buffer, len, "/dev/%s/%s", DM_DIR, dev_name);
}
int add_dev_node(const char *dev_name, dev_t dev)
{
char path[PATH_MAX];
struct stat info;
_build_dev_path(path, sizeof(path), dev_name);
if (stat(path, &info) >= 0) {
if (!S_ISBLK(info.st_mode)) {
log("A non-block device file at '%s' "
"is already present", path);
return 0;
}
if (info.st_rdev == dev)
return 1;
if (unlink(path) < 0) {
log("Unable to unlink device node for '%s'", dev_name);
return 0;
}
}
if (mknod(path, S_IFBLK | S_IRUSR | S_IWUSR | S_IRGRP, dev) < 0) {
log("Unable to make device node for '%s'", dev_name);
return 0;
}
return 1;
}
int rm_dev_node(const char *dev_name)
{
char path[PATH_MAX];
struct stat info;
_build_dev_path(path, sizeof(path), dev_name);
if (stat(path, &info) < 0)
return 1;
if (unlink(path) < 0) {
log("Unable to unlink device node for '%s'", dev_name);
return 0;
}
return 1;
}
int dm_set_dev_dir(const char *dir)
{
snprintf(_dm_dir, sizeof(_dm_dir), "%s%s", dir, DM_DIR);
return 1;
}
const char *dm_dir(void)
{
return _dm_dir;
}

16
libdm/libdm-common.h Normal file
View File

@ -0,0 +1,16 @@
/*
* Copyright (C) 2001 Sistina Software (UK) Limited.
*
* This file is released under the LGPL.
*/
extern dm_log_fn _log;
#define log(msg, x...) _log(1, __FILE__, __LINE__, msg, ## x)
extern struct target *create_target(uint64_t start,
uint64_t len,
const char *type, const char *params);
int add_dev_node(const char *dev_name, dev_t dev);
int rm_dev_node(const char *dev_name);