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Proposed changes to the ioctl interface to fix alignment issues on some

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architectures and specify an explicit width for every numeric field.
This commit is contained in:
Alasdair Kergon
2003-03-28 18:58:59 +00:00
parent e78d985cdf
commit 7e46192f67
5 changed files with 51 additions and 56 deletions
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78
libdm/ioctl/libdevmapper.c
View File

@@ -23,7 +23,7 @@
*/ */
#if !((DM_VERSION_MAJOR == 1 && DM_VERSION_MINOR >= 0) || \ #if !((DM_VERSION_MAJOR == 1 && DM_VERSION_MINOR >= 0) || \
(DM_VERSION_MAJOR == 2 && DM_VERSION_MINOR >= 0)) (DM_VERSION_MAJOR == 3 && DM_VERSION_MINOR >= 0))
#error The version of dm-ioctl.h included is incompatible. #error The version of dm-ioctl.h included is incompatible.
#endif #endif
@@ -35,7 +35,7 @@ static int _log_suppress = 0;
* Support both old and new major numbers to ease the transition. * Support both old and new major numbers to ease the transition.
* Clumsy, but only temporary. * Clumsy, but only temporary.
*/ */
#if DM_VERSION_MAJOR == 2 && defined(DM_COMPAT) #if DM_VERSION_MAJOR == 3 && defined(DM_COMPAT)
const int _dm_compat = 1; const int _dm_compat = 1;
#else #else
const int _dm_compat = 0; const int _dm_compat = 0;
@@ -43,20 +43,20 @@ const int _dm_compat = 0;
/* *INDENT-OFF* */ /* *INDENT-OFF* */
static struct cmd_data _cmd_data_v2[] = { static struct cmd_data _cmd_data_v3[] = {
{"create", DM_DEV_CREATE, {2, 0, 0}}, {"create", DM_DEV_CREATE, {3, 0, 0}},
{"reload", DM_DEV_RELOAD, {2, 0, 0}}, {"reload", DM_DEV_RELOAD, {3, 0, 0}},
{"remove", DM_DEV_REMOVE, {2, 0, 0}}, {"remove", DM_DEV_REMOVE, {3, 0, 0}},
{"remove_all", DM_REMOVE_ALL, {2, 0, 0}}, {"remove_all", DM_REMOVE_ALL, {3, 0, 0}},
{"suspend", DM_DEV_SUSPEND, {2, 0, 0}}, {"suspend", DM_DEV_SUSPEND, {3, 0, 0}},
{"resume", DM_DEV_SUSPEND, {2, 0, 0}}, {"resume", DM_DEV_SUSPEND, {3, 0, 0}},
{"info", DM_DEV_STATUS, {2, 0, 0}}, {"info", DM_DEV_STATUS, {3, 0, 0}},
{"deps", DM_DEV_DEPS, {2, 0, 0}}, {"deps", DM_DEV_DEPS, {3, 0, 0}},
{"rename", DM_DEV_RENAME, {2, 0, 0}}, {"rename", DM_DEV_RENAME, {3, 0, 0}},
{"version", DM_VERSION, {2, 0, 0}}, {"version", DM_VERSION, {3, 0, 0}},
{"status", DM_TARGET_STATUS, {2, 0, 0}}, {"status", DM_TARGET_STATUS, {3, 0, 0}},
{"table", DM_TARGET_STATUS, {2, 0, 0}}, {"table", DM_TARGET_STATUS, {3, 0, 0}},
{"waitevent", DM_TARGET_WAIT, {2, 0, 0}}, {"waitevent", DM_TARGET_WAIT, {3, 0, 0}},
}; };
/* *INDENT-ON* */ /* *INDENT-ON* */
@@ -89,7 +89,7 @@ static int _unmarshal_status_v1(struct dm_task *dmt, struct dm_ioctl_v1 *dmi)
{ {
char *outbuf = (char *) dmi + sizeof(struct dm_ioctl_v1); char *outbuf = (char *) dmi + sizeof(struct dm_ioctl_v1);
char *outptr = outbuf; char *outptr = outbuf;
uint32_t i; int32_t i;
struct dm_target_spec_v1 *spec; struct dm_target_spec_v1 *spec;
for (i = 0; i < dmi->target_count; i++) { for (i = 0; i < dmi->target_count; i++) {
@@ -138,8 +138,8 @@ static const char *_dm_task_get_uuid_v1(struct dm_task *dmt)
static struct dm_deps *_dm_task_get_deps_v1(struct dm_task *dmt) static struct dm_deps *_dm_task_get_deps_v1(struct dm_task *dmt)
{ {
return (struct dm_deps *) (((void *) dmt->dmi.v1) + log_error("deps version 1 no longer supported by libdevmapper");
dmt->dmi.v1->data_start); return NULL;
} }
static void *_add_target_v1(struct target *t, void *out, void *end) static void *_add_target_v1(struct target *t, void *out, void *end)
@@ -356,8 +356,8 @@ void dm_task_destroy(struct dm_task *dmt)
if (dmt->newname) if (dmt->newname)
free(dmt->newname); free(dmt->newname);
if (dmt->dmi.v2) if (dmt->dmi.v3)
free(dmt->dmi.v2); free(dmt->dmi.v3);
if (dmt->uuid) if (dmt->uuid)
free(dmt->uuid); free(dmt->uuid);
@@ -372,12 +372,12 @@ int dm_task_get_driver_version(struct dm_task *dmt, char *version, size_t size)
if (_dm_version == 1) if (_dm_version == 1)
return _dm_task_get_driver_version_v1(dmt, version, size); return _dm_task_get_driver_version_v1(dmt, version, size);
if (!dmt->dmi.v2) { if (!dmt->dmi.v3) {
version[0] = '\0'; version[0] = '\0';
return 0; return 0;
} }
v = dmt->dmi.v2->version; v = dmt->dmi.v3->version;
snprintf(version, size, "%u.%u.%u", v[0], v[1], v[2]); snprintf(version, size, "%u.%u.%u", v[0], v[1], v[2]);
return 1; return 1;
} }
@@ -496,21 +496,21 @@ int dm_task_get_info(struct dm_task *dmt, struct dm_info *info)
if (_dm_version == 1) if (_dm_version == 1)
return _dm_task_get_info_v1(dmt, info); return _dm_task_get_info_v1(dmt, info);
if (!dmt->dmi.v2) if (!dmt->dmi.v3)
return 0; return 0;
memset(info, 0, sizeof(*info)); memset(info, 0, sizeof(*info));
info->exists = dmt->dmi.v2->flags & DM_EXISTS_FLAG ? 1 : 0; info->exists = dmt->dmi.v3->flags & DM_EXISTS_FLAG ? 1 : 0;
if (!info->exists) if (!info->exists)
return 1; return 1;
info->suspended = dmt->dmi.v2->flags & DM_SUSPEND_FLAG ? 1 : 0; info->suspended = dmt->dmi.v3->flags & DM_SUSPEND_FLAG ? 1 : 0;
info->read_only = dmt->dmi.v2->flags & DM_READONLY_FLAG ? 1 : 0; info->read_only = dmt->dmi.v3->flags & DM_READONLY_FLAG ? 1 : 0;
info->target_count = dmt->dmi.v2->target_count; info->target_count = dmt->dmi.v3->target_count;
info->open_count = dmt->dmi.v2->open_count; info->open_count = dmt->dmi.v3->open_count;
info->major = MAJOR(dmt->dmi.v2->dev); info->major = MAJOR(dmt->dmi.v3->dev);
info->minor = MINOR(dmt->dmi.v2->dev); info->minor = MINOR(dmt->dmi.v3->dev);
return 1; return 1;
} }
@@ -520,7 +520,7 @@ const char *dm_task_get_uuid(struct dm_task *dmt)
if (_dm_version == 1) if (_dm_version == 1)
return _dm_task_get_uuid_v1(dmt); return _dm_task_get_uuid_v1(dmt);
return (dmt->dmi.v2->uuid); return (dmt->dmi.v3->uuid);
} }
struct dm_deps *dm_task_get_deps(struct dm_task *dmt) struct dm_deps *dm_task_get_deps(struct dm_task *dmt)
@@ -528,8 +528,8 @@ struct dm_deps *dm_task_get_deps(struct dm_task *dmt)
if (_dm_version == 1) if (_dm_version == 1)
return _dm_task_get_deps_v1(dmt); return _dm_task_get_deps_v1(dmt);
return (struct dm_deps *) (((void *) dmt->dmi.v2) + return (struct dm_deps *) (((void *) dmt->dmi.v3) +
dmt->dmi.v2->data_start); dmt->dmi.v3->data_start);
} }
int dm_task_set_ro(struct dm_task *dmt) int dm_task_set_ro(struct dm_task *dmt)
@@ -657,7 +657,7 @@ static struct dm_ioctl *_flatten(struct dm_task *dmt)
memset(dmi, 0, len); memset(dmi, 0, len);
version = &_cmd_data_v2[dmt->type].version; version = &_cmd_data_v3[dmt->type].version;
dmi->version[0] = (*version)[0]; dmi->version[0] = (*version)[0];
dmi->version[1] = (*version)[1]; dmi->version[1] = (*version)[1];
@@ -726,18 +726,18 @@ int dm_task_run(struct dm_task *dmt)
} }
if ((unsigned) dmt->type >= if ((unsigned) dmt->type >=
(sizeof(_cmd_data_v2) / sizeof(*_cmd_data_v2))) { (sizeof(_cmd_data_v3) / sizeof(*_cmd_data_v3))) {
log_error("Internal error: unknown device-mapper task %d", log_error("Internal error: unknown device-mapper task %d",
dmt->type); dmt->type);
goto bad; goto bad;
} }
command = _cmd_data_v2[dmt->type].cmd; command = _cmd_data_v3[dmt->type].cmd;
if (dmt->type == DM_DEVICE_TABLE) if (dmt->type == DM_DEVICE_TABLE)
dmi->flags |= DM_STATUS_TABLE_FLAG; dmi->flags |= DM_STATUS_TABLE_FLAG;
log_debug("dm %s %s %s %s", _cmd_data_v2[dmt->type].name, dmi->name, log_debug("dm %s %s %s %s", _cmd_data_v3[dmt->type].name, dmi->name,
dmi->uuid, dmt->newname ? dmt->newname : ""); dmi->uuid, dmt->newname ? dmt->newname : "");
if (ioctl(fd, command, dmi) < 0) { if (ioctl(fd, command, dmi) < 0) {
if (_log_suppress) if (_log_suppress)
@@ -769,7 +769,7 @@ int dm_task_run(struct dm_task *dmt)
break; break;
} }
dmt->dmi.v2 = dmi; dmt->dmi.v3 = dmi;
close(fd); close(fd);
return 1; return 1;

4
libdm/ioctl/libdm-compat.h
View File

@@ -27,8 +27,8 @@ struct dm_ioctl_v1 {
uint32_t data_start; /* offset to start of data uint32_t data_start; /* offset to start of data
* relative to start of this struct */ * relative to start of this struct */
uint32_t target_count; /* in/out */ int32_t target_count; /* in/out */
uint32_t open_count; /* out */ int32_t open_count; /* out */
uint32_t flags; /* in/out */ uint32_t flags; /* in/out */
__kernel_dev_t dev; /* in/out */ __kernel_dev_t dev; /* in/out */

2
libdm/ioctl/libdm-targets.h
View File

@@ -30,7 +30,7 @@ struct dm_task {
int read_only; int read_only;
int minor; int minor;
union { union {
struct dm_ioctl *v2; struct dm_ioctl *v3;
struct dm_ioctl_v1 *v1; struct dm_ioctl_v1 *v1;
} dmi; } dmi;
char *newname; char *newname;

13
libdm/libdevmapper.h
View File

@@ -65,17 +65,18 @@ int dm_task_set_uuid(struct dm_task *dmt, const char *uuid);
struct dm_info { struct dm_info {
int exists; int exists;
int suspended; int suspended;
unsigned int open_count; int32_t open_count;
int major; uint32_t major;
int minor; /* minor device number */ uint32_t minor; /* minor device number */
int read_only; /* 0:read-write; 1:read-only */ int read_only; /* 0:read-write; 1:read-only */
unsigned int target_count; int32_t target_count;
}; };
struct dm_deps { struct dm_deps {
unsigned int count; uint32_t count;
__kernel_dev_t device[0]; uint32_t filler;
uint64_t device[0];
}; };
int dm_get_library_version(char *version, size_t size); int dm_get_library_version(char *version, size_t size);

10
tools/dmsetup.c
View File

@@ -8,15 +8,8 @@
#include <stdio.h> #include <stdio.h>
#include <stdlib.h> #include <stdlib.h>
#include <stdarg.h>
#include <string.h> #include <string.h>
#include <unistd.h>
#include <fcntl.h>
#include <sys/stat.h>
#include <sys/types.h>
#include <ctype.h> #include <ctype.h>
#include <errno.h>
#include <unistd.h>
#include <getopt.h> #include <getopt.h>
#include <linux/kdev_t.h> #include <linux/kdev_t.h>
@@ -327,7 +320,8 @@ static int _info(int argc, char **argv)
static int _deps(int argc, char **argv) static int _deps(int argc, char **argv)
{ {
int r = 0, i; int r = 0;
uint32_t i;
struct dm_deps *deps; struct dm_deps *deps;
/* remove <dev_name> */ /* remove <dev_name> */