1
0
mirror of git://sourceware.org/git/lvm2.git synced 2024-12-22 17:35:59 +03:00
lvm2/lib/config/config.c
Petr Rockai e59e2f7c3c Move the core of the lib/config/config.c functionality into libdevmapper,
leaving behind the LVM-specific parts of the code (convenience wrappers that
handle `struct device` and `struct cmd_context`, basically). A number of
functions have been renamed (in addition to getting a dm_ prefix) -- namely,
all of the config interface now has a dm_config_ prefix.
2011-08-30 14:55:15 +00:00

304 lines
7.0 KiB
C

/*
* Copyright (C) 2001-2004 Sistina Software, Inc. All rights reserved.
* Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser General Public License
* along with this program; if not, write to the Free Software Foundation,
* Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "lib.h"
#include "config.h"
#include "crc.h"
#include "device.h"
#include "str_list.h"
#include "toolcontext.h"
#include "lvm-string.h"
#include "lvm-file.h"
#include <sys/stat.h>
#include <sys/mman.h>
#include <unistd.h>
#include <fcntl.h>
#include <ctype.h>
void destroy_config_tree(struct dm_config_tree *cft)
{
struct device *dev = dm_config_get_custom(cft);
if (dev)
dev_close(dev);
dm_config_destroy(cft);
}
int override_config_tree_from_string(struct cmd_context *cmd,
const char *config_settings)
{
if (!(cmd->cft_override = dm_config_from_string(config_settings))) {
log_error("Failed to set overridden configuration entries.");
return 1;
}
return 0;
}
int read_config_fd(struct dm_config_tree *cft, struct device *dev,
off_t offset, size_t size, off_t offset2, size_t size2,
checksum_fn_t checksum_fn, uint32_t checksum)
{
const char *fb, *fe;
int r = 0;
int use_mmap = 1;
off_t mmap_offset = 0;
char *buf = NULL;
/* Only use mmap with regular files */
if (!(dev->flags & DEV_REGULAR) || size2)
use_mmap = 0;
if (use_mmap) {
mmap_offset = offset % lvm_getpagesize();
/* memory map the file */
fb = mmap((caddr_t) 0, size + mmap_offset, PROT_READ,
MAP_PRIVATE, dev_fd(dev), offset - mmap_offset);
if (fb == (caddr_t) (-1)) {
log_sys_error("mmap", dev_name(dev));
goto out;
}
fb = fb + mmap_offset;
} else {
if (!(buf = dm_malloc(size + size2)))
return_0;
if (!dev_read_circular(dev, (uint64_t) offset, size,
(uint64_t) offset2, size2, buf)) {
goto out;
}
fb = buf;
}
if (checksum_fn && checksum !=
(checksum_fn(checksum_fn(INITIAL_CRC, (const uint8_t *)fb, size),
(const uint8_t *)(fb + size), size2))) {
log_error("%s: Checksum error", dev_name(dev));
goto out;
}
fe = fb + size + size2;
if (!dm_config_parse(cft, fb, fe))
goto_out;
r = 1;
out:
if (!use_mmap)
dm_free(buf);
else {
/* unmap the file */
if (munmap((char *) (fb - mmap_offset), size + mmap_offset)) {
log_sys_error("munmap", dev_name(dev));
r = 0;
}
}
return r;
}
int read_config_file(struct dm_config_tree *cft)
{
const char *filename;
struct device *dev = dm_config_get_custom(cft);
struct stat info;
int r;
if (!dm_config_check_file(cft, &filename, &info))
return 0;
if (!dev) {
if (!(dev = dev_create_file(filename, NULL, NULL, 1)))
return_0;
if (!dev_open_readonly_buffered(dev))
return_0;
}
dm_config_set_custom(cft, dev);
r = read_config_fd(cft, dev, 0, (size_t) info.st_size, 0, 0,
(checksum_fn_t) NULL, 0);
if (!dm_config_keep_open(cft)) {
dev_close(dev);
dm_config_set_custom(cft, NULL);
}
return r;
}
static struct dm_config_tree *_setup_context_tree(struct cmd_context *cmd)
{
struct dm_config_tree *r = cmd->cft_override;
if (r)
r->cascade = cmd->cft;
else
r = cmd->cft;
return r;
}
const struct dm_config_node *find_config_tree_node(struct cmd_context *cmd,
const char *path)
{
return dm_config_tree_find_node(_setup_context_tree(cmd), path);
}
const char *find_config_tree_str(struct cmd_context *cmd,
const char *path, const char *fail)
{
return dm_config_tree_find_str(_setup_context_tree(cmd), path, fail);
}
int find_config_tree_int(struct cmd_context *cmd, const char *path,
int fail)
{
return dm_config_tree_find_int(_setup_context_tree(cmd), path, fail);
}
int64_t find_config_tree_int64(struct cmd_context *cmd, const char *path, int64_t fail)
{
return dm_config_tree_find_int64(_setup_context_tree(cmd), path, fail);
}
float find_config_tree_float(struct cmd_context *cmd, const char *path,
float fail)
{
return dm_config_tree_find_float(_setup_context_tree(cmd), path, fail);
}
int find_config_tree_bool(struct cmd_context *cmd, const char *path, int fail)
{
return dm_config_tree_find_bool(_setup_context_tree(cmd), path, fail);
}
/* Insert cn2 after cn1 */
static void _insert_config_node(struct dm_config_node **cn1,
struct dm_config_node *cn2)
{
if (!*cn1) {
*cn1 = cn2;
cn2->sib = NULL;
} else {
cn2->sib = (*cn1)->sib;
(*cn1)->sib = cn2;
}
}
/*
* Merge section cn2 into section cn1 (which has the same name)
* overwriting any existing cn1 nodes with matching names.
*/
static void _merge_section(struct dm_config_node *cn1, struct dm_config_node *cn2)
{
struct dm_config_node *cn, *nextn, *oldn;
struct dm_config_value *cv;
for (cn = cn2->child; cn; cn = nextn) {
nextn = cn->sib;
/* Skip "tags" */
if (!strcmp(cn->key, "tags"))
continue;
/* Subsection? */
if (!cn->v)
/* Ignore - we don't have any of these yet */
continue;
/* Not already present? */
if (!(oldn = (struct dm_config_node*)dm_config_find_node(cn1->child, cn->key))) {
_insert_config_node(&cn1->child, cn);
continue;
}
/* Merge certain value lists */
if ((!strcmp(cn1->key, "activation") &&
!strcmp(cn->key, "volume_list")) ||
(!strcmp(cn1->key, "devices") &&
(!strcmp(cn->key, "filter") || !strcmp(cn->key, "types")))) {
cv = cn->v;
while (cv->next)
cv = cv->next;
cv->next = oldn->v;
}
/* Replace values */
oldn->v = cn->v;
}
}
static int _match_host_tags(struct dm_list *tags, const struct dm_config_node *tn)
{
const struct dm_config_value *tv;
const char *str;
for (tv = tn->v; tv; tv = tv->next) {
if (tv->type != DM_CFG_STRING)
continue;
str = tv->v.str;
if (*str == '@')
str++;
if (!*str)
continue;
if (str_list_match_item(tags, str))
return 1;
}
return 0;
}
/* Destructively merge a new config tree into an existing one */
int merge_config_tree(struct cmd_context *cmd, struct dm_config_tree *cft,
struct dm_config_tree *newdata)
{
const struct dm_config_node *root = cft->root;
struct dm_config_node *cn, *nextn, *oldn, *cn2;
const struct dm_config_node *tn;
for (cn = newdata->root; cn; cn = nextn) {
nextn = cn->sib;
/* Ignore tags section */
if (!strcmp(cn->key, "tags"))
continue;
/* If there's a tags node, skip if host tags don't match */
if ((tn = dm_config_find_node(cn->child, "tags"))) {
if (!_match_host_tags(&cmd->tags, tn))
continue;
}
if (!(oldn = (struct dm_config_node *)dm_config_find_node(root, cn->key))) {
_insert_config_node(&cft->root, cn);
/* Remove any "tags" nodes */
for (cn2 = cn->child; cn2; cn2 = cn2->sib) {
if (!strcmp(cn2->key, "tags")) {
cn->child = cn2->sib;
continue;
}
if (cn2->sib && !strcmp(cn2->sib->key, "tags")) {
cn2->sib = cn2->sib->sib;
continue;
}
}
continue;
}
_merge_section(oldn, cn);
}
return 1;
}