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Make a cleaner split between config tree and config file functionality. Move

Browse Source 
the latter out of libdm.
This commit is contained in:
Petr Rockai 2011-12-18 21:56:03 +00:00
parent dc1d4e2444
commit e4de6d2ee0
9 changed files with 199 additions and 202 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
lib/cache/lvmcache.c vendored
View File

@ -85,7 +85,7 @@ static void _free_cached_vgmetadata(struct lvmcache_vginfo *vginfo)
/* Release also cached config tree */
if (vginfo->cft) {
destroy_config_tree(vginfo->cft);
dm_config_destroy(vginfo->cft);
vginfo->cft = NULL;
}

20
lib/commands/toolcontext.c
View File

@ -500,7 +500,7 @@ static int _load_config_file(struct cmd_context *cmd, const char *tag)
return 0;
}
if (!(cfl->cft = dm_config_create(config_file, 0))) {
if (!(cfl->cft = config_file_open(config_file, 0))) {
log_error("config_tree allocation failed");
return 0;
}
@ -512,14 +512,14 @@ static int _load_config_file(struct cmd_context *cmd, const char *tag)
goto out;
}
log_sys_error("stat", config_file);
destroy_config_tree(cfl->cft);
config_file_destroy(cfl->cft);
return 0;
}
log_very_verbose("Loading config file: %s", config_file);
if (!read_config_file(cfl->cft)) {
if (!config_file_read(cfl->cft)) {
log_error("Failed to load config file %s", config_file);
destroy_config_tree(cfl->cft);
config_file_destroy(cfl->cft);
return 0;
}
@ -540,7 +540,7 @@ static int _init_lvm_conf(struct cmd_context *cmd)
{
/* No config file if LVM_SYSTEM_DIR is empty */
if (!*cmd->system_dir) {
if (!(cmd->cft = dm_config_create(NULL, 0))) {
if (!(cmd->cft = config_file_open(NULL, 0))) {
log_error("Failed to create config tree");
return 0;
}
@ -573,7 +573,7 @@ static struct dm_config_tree *_merge_config_files(struct cmd_context *cmd, struc
/* Replace temporary duplicate copy of lvm.conf */
if (cft->root) {
if (!(cft = dm_config_create(NULL, 0))) {
if (!(cft = config_file_open(NULL, 0))) {
log_error("Failed to create config tree");
return 0;
}
@ -602,7 +602,7 @@ int config_files_changed(struct cmd_context *cmd)
struct config_tree_list *cfl;
dm_list_iterate_items(cfl, &cmd->config_files) {
if (dm_config_changed(cfl->cft))
if (config_file_changed(cfl->cft))
return 1;
}
@ -627,11 +627,11 @@ static struct dm_config_tree *_destroy_tag_configs(struct cmd_context *cmd)
dm_list_iterate_items(cfl, &cmd->config_files) {
if (cfl->cft == cmd->cft)
cmd->cft = NULL;
destroy_config_tree(cfl->cft);
config_file_destroy(cfl->cft);
}
if (cmd->cft) {
destroy_config_tree(cmd->cft);
config_file_destroy(cmd->cft);
cmd->cft = NULL;
}
@ -852,7 +852,7 @@ static int _init_filters(struct cmd_context *cmd, unsigned load_persistent_cache
*/
if (load_persistent_cache && !cmd->is_long_lived &&
!stat(dev_cache, &st) &&
(st.st_ctime > dm_config_timestamp(cmd->cft)) &&
(st.st_ctime > config_file_timestamp(cmd->cft)) &&
!persistent_filter_load(f4, NULL))
log_verbose("Failed to load existing device cache from %s",
dev_cache);

159
lib/config/config.c
View File

@ -29,13 +29,128 @@
#include <unistd.h>
#include <fcntl.h>
#include <ctype.h>
#include <assert.h>
void destroy_config_tree(struct dm_config_tree *cft)
struct config_file {
time_t timestamp;
off_t st_size;
char *filename;
int exists;
int keep_open;
struct device *dev;
};
/*
* public interface
*/
struct dm_config_tree *config_file_open(const char *filename, int keep_open)
{
struct device *dev = dm_config_get_custom(cft);
struct dm_config_tree *cft = dm_config_create();
struct config_file *cf;
if (!cft)
return NULL;
if (dev)
dev_close(dev);
cf = dm_pool_zalloc(cft->mem, sizeof(struct config_file));
if (!cf) goto fail;
cf->timestamp = 0;
cf->exists = 0;
cf->keep_open = keep_open;
dm_config_set_custom(cft, cf);
if (filename &&
!(cf->filename = dm_pool_strdup(cft->mem, filename))) {
log_error("Failed to duplicate filename.");
goto fail;
}
return cft;
fail:
dm_config_destroy(cft);
return NULL;
}
/*
* Doesn't populate filename if the file is empty.
*/
int config_file_check(struct dm_config_tree *cft, const char **filename, struct stat *info)
{
struct config_file *cf = dm_config_get_custom(cft);
struct stat _info;
if (!info)
info = &_info;
if (stat(cf->filename, info)) {
log_sys_error("stat", cf->filename);
cf->exists = 0;
return 0;
}
if (!S_ISREG(info->st_mode)) {
log_error("%s is not a regular file", cf->filename);
cf->exists = 0;
return 0;
}
cf->exists = 1;
cf->timestamp = info->st_ctime;
cf->st_size = info->st_size;
if (info->st_size == 0)
log_verbose("%s is empty", cf->filename);
else if (filename)
*filename = cf->filename;
return 1;
}
/*
* Return 1 if config files ought to be reloaded
*/
int config_file_changed(struct dm_config_tree *cft)
{
struct config_file *cf = dm_config_get_custom(cft);
struct stat info;
if (!cf->filename)
return 0;
if (stat(cf->filename, &info) == -1) {
/* Ignore a deleted config file: still use original data */
if (errno == ENOENT) {
if (!cf->exists)
return 0;
log_very_verbose("Config file %s has disappeared!",
cf->filename);
goto reload;
}
log_sys_error("stat", cf->filename);
log_error("Failed to reload configuration files");
return 0;
}
if (!S_ISREG(info.st_mode)) {
log_error("Configuration file %s is not a regular file",
cf->filename);
goto reload;
}
/* Unchanged? */
if (cf->timestamp == info.st_ctime && cf->st_size == info.st_size)
return 0;
reload:
log_verbose("Detected config file change to %s", cf->filename);
return 1;
}
void config_file_destroy(struct dm_config_tree *cft)
{
struct config_file *cf = dm_config_get_custom(cft);
if (cf && cf->dev)
dev_close(cf->dev);
dm_config_destroy(cft);
}
@ -74,9 +189,9 @@ int override_config_tree_from_string(struct cmd_context *cmd,
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)
int config_file_read_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;
@ -137,40 +252,46 @@ int read_config_fd(struct dm_config_tree *cft, struct device *dev,
return r;
}
int read_config_file(struct dm_config_tree *cft)
int config_file_read(struct dm_config_tree *cft)
{
const char *filename = NULL;
struct device *dev = dm_config_get_custom(cft);
struct config_file *cf = dm_config_get_custom(cft);
struct stat info;
int r;
if (!dm_config_check_file(cft, &filename, &info))
if (!config_file_check(cft, &filename, &info))
return_0;
/* Nothing to do. E.g. empty file. */
if (!filename)
return 1;
if (!dev) {
if (!(dev = dev_create_file(filename, NULL, NULL, 1)))
if (!cf->dev) {
if (!(cf->dev = dev_create_file(filename, NULL, NULL, 1)))
return_0;
if (!dev_open_readonly_buffered(dev))
if (!dev_open_readonly_buffered(cf->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);
r = config_file_read_fd(cft, cf->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);
if (!cf->keep_open) {
dev_close(cf->dev);
cf->dev = NULL;
}
return r;
}
time_t config_file_timestamp(struct dm_config_tree *cft)
{
struct config_file *cf = dm_config_get_custom(cft);
assert(cf);
return cf->timestamp;
}
const struct dm_config_node *find_config_tree_node(struct cmd_context *cmd,
const char *path)
{

16
lib/config/config.h
View File

@ -23,19 +23,23 @@ struct cmd_context;
int override_config_tree_from_string(struct cmd_context *cmd,
const char *config_settings);
void destroy_config_tree(struct dm_config_tree *cft);
struct dm_config_tree *remove_overridden_config_tree(struct cmd_context *cmd);
typedef uint32_t (*checksum_fn_t) (uint32_t initial, const uint8_t *buf, uint32_t size);
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);
struct dm_config_tree *config_file_open(const char *filename, int keep_open);
int config_file_read_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);
int config_file_read(struct dm_config_tree *cft);
int config_write(struct dm_config_tree *cft, const char *file,
int argc, char **argv);
void config_file_destroy(struct dm_config_tree *cft);
time_t config_file_timestamp(struct dm_config_tree *cft);
int config_file_changed(struct dm_config_tree *cft);
int config_file_check(struct dm_config_tree *cft, const char **filename, struct stat *info);
int read_config_file(struct dm_config_tree *cft);
int merge_config_tree(struct cmd_context *cmd, struct dm_config_tree *cft,
struct dm_config_tree *newdata);

8
lib/filters/filter-persistent.c
View File

@ -122,10 +122,10 @@ int persistent_filter_load(struct dev_filter *f, struct dm_config_tree **cft_out
return_0;
}
if (!(cft = dm_config_create(pf->file, 1)))
if (!(cft = config_file_open(pf->file, 1)))
return_0;
if (!read_config_file(cft))
if (!config_file_read(cft))
goto_out;
_read_array(pf, cft, "persistent_filter_cache/valid_devices",
@ -147,7 +147,7 @@ int persistent_filter_load(struct dev_filter *f, struct dm_config_tree **cft_out
if (r && cft_out)
*cft_out = cft;
else
destroy_config_tree(cft);
config_file_destroy(cft);
return r;
}
@ -271,7 +271,7 @@ out:
fcntl_unlock_file(lockfd);
if (cft)
destroy_config_tree(cft);
config_file_destroy(cft);
return r;
}

20
lib/format_text/import.c
View File

@ -49,12 +49,12 @@ const char *text_vgname_import(const struct format_type *fmt,
_init_text_import();
if (!(cft = dm_config_create(NULL, 0)))
if (!(cft = config_file_open(NULL, 0)))
return_NULL;
if ((!dev && !read_config_file(cft)) ||
(dev && !read_config_fd(cft, dev, offset, size,
offset2, size2, checksum_fn, checksum)))
if ((!dev && !config_file_read(cft)) ||
(dev && !config_file_read_fd(cft, dev, offset, size,
offset2, size2, checksum_fn, checksum)))
goto_out;
/*
@ -72,7 +72,7 @@ const char *text_vgname_import(const struct format_type *fmt,
}
out:
destroy_config_tree(cft);
config_file_destroy(cft);
return vgname;
}
@ -94,12 +94,12 @@ struct volume_group *text_vg_import_fd(struct format_instance *fid,
*desc = NULL;
*when = 0;
if (!(cft = dm_config_create(file, 0)))
if (!(cft = config_file_open(file, 0)))
return_NULL;
if ((!dev && !read_config_file(cft)) ||
(dev && !read_config_fd(cft, dev, offset, size,
offset2, size2, checksum_fn, checksum))) {
if ((!dev && !config_file_read(cft)) ||
(dev && !config_file_read_fd(cft, dev, offset, size,
offset2, size2, checksum_fn, checksum))) {
log_error("Couldn't read volume group metadata.");
goto out;
}
@ -119,7 +119,7 @@ struct volume_group *text_vg_import_fd(struct format_instance *fid,
}
out:
destroy_config_tree(cft);
config_file_destroy(cft);
return vg;
}

10
libdm/libdevmapper.h
View File

@ -1321,16 +1321,15 @@ struct dm_config_node {
struct dm_config_tree {
struct dm_config_node *root;
struct dm_config_tree *cascade;
struct dm_pool *mem;
void *custom;
};
struct dm_config_tree *dm_config_create(const char *filename, int keep_open);
struct dm_config_tree *dm_config_create(void);
struct dm_config_tree *dm_config_from_string(const char *config_settings);
int dm_config_parse(struct dm_config_tree *cft, const char *start, const char *end);
void *dm_config_get_custom(struct dm_config_tree *cft);
int dm_config_check_file(struct dm_config_tree *cft, const char **filename, struct stat *info);
int dm_config_keep_open(struct dm_config_tree *ctf);
void dm_config_set_custom(struct dm_config_tree *cft, void *custom);
/*
@ -1349,9 +1348,6 @@ void dm_config_destroy(struct dm_config_tree *cft);
typedef int (*dm_putline_fn)(const char *line, void *baton);
int dm_config_write_node(const struct dm_config_node *cn, dm_putline_fn putline, void *baton);
time_t dm_config_timestamp(struct dm_config_tree *cft);
int dm_config_changed(struct dm_config_tree *cft);
struct dm_config_node *dm_config_find_node(struct dm_config_node *cn, const char *path);
int dm_config_has_node(const struct dm_config_node *cn, const char *path);
const char *dm_config_find_str(const struct dm_config_node *cn, const char *path, const char *fail);

2
libdm/libdm-common.c
View File

@ -900,7 +900,7 @@ static int _stack_node_op(node_op_t type, const char *dev_name, uint32_t major,
break; /* no other DEL ops */
}
}
else if ((type == NODE_RENAME))
else if (type == NODE_RENAME)
/*
* Ignore any outstanding operations if renaming it.
*

164
libdm/libdm-config.c
View File

@ -50,17 +50,6 @@ struct parser {
struct dm_pool *mem;
};
struct cs {
struct dm_config_tree cft;
struct dm_pool *mem;
time_t timestamp;
off_t st_size;
char *filename;
int exists;
int keep_open; // FIXME AGK Remove this before release
void *custom; /* LVM uses this for a device pointer */
};
struct output_line {
struct dm_pool *mem;
dm_putline_fn putline;
@ -100,12 +89,9 @@ static int _tok_match(const char *str, const char *b, const char *e)
return !(*str || (b != e));
}
/*
* public interface
*/
struct dm_config_tree *dm_config_create(const char *filename, int keep_open)
struct dm_config_tree *dm_config_create()
{
struct cs *c;
struct dm_config_tree *cft;
struct dm_pool *mem = dm_pool_create("config", 10 * 1024);
if (!mem) {
@ -113,54 +99,31 @@ struct dm_config_tree *dm_config_create(const char *filename, int keep_open)
return 0;
}
if (!(c = dm_pool_zalloc(mem, sizeof(*c)))) {
if (!(cft = dm_pool_zalloc(mem, sizeof(*cft)))) {
log_error("Failed to allocate config tree.");
dm_pool_destroy(mem);
return 0;
}
c->mem = mem;
c->cft.root = (struct dm_config_node *) NULL;
c->cft.cascade = NULL;
c->timestamp = 0;
c->exists = 0;
c->keep_open = keep_open;
c->custom = NULL;
if (filename &&
!(c->filename = dm_pool_strdup(c->mem, filename))) {
log_error("Failed to duplicate filename.");
dm_pool_destroy(mem);
return 0;
}
return &c->cft;
cft->root = NULL;
cft->cascade = NULL;
cft->custom = NULL;
cft->mem = mem;
return cft;
}
void dm_config_set_custom(struct dm_config_tree *cft, void *custom)
{
struct cs *c = (struct cs *) cft;
c->custom = custom;
cft->custom = custom;
}
void *dm_config_get_custom(struct dm_config_tree *cft)
{
struct cs *c = (struct cs *) cft;
return c->custom;
}
int dm_config_keep_open(struct dm_config_tree *cft)
{
struct cs *c = (struct cs *) cft;
return c->keep_open;
return cft->custom;
}
void dm_config_destroy(struct dm_config_tree *cft)
{
struct cs *c = (struct cs *) cft;
dm_pool_destroy(c->mem);
dm_pool_destroy(cft->mem);
}
/*
@ -194,12 +157,11 @@ int dm_config_parse(struct dm_config_tree *cft, const char *start, const char *e
{
/* TODO? if (start == end) return 1; */
struct cs *c = (struct cs *) cft;
struct parser *p;
if (!(p = dm_pool_alloc(c->mem, sizeof(*p))))
if (!(p = dm_pool_alloc(cft->mem, sizeof(*p))))
return_0;
p->mem = c->mem;
p->mem = cft->mem;
p->fb = start;
p->fe = end;
p->tb = p->te = p->fb;
@ -216,7 +178,7 @@ struct dm_config_tree *dm_config_from_string(const char *config_settings)
{
struct dm_config_tree *cft;
if (!(cft = dm_config_create(NULL, 0)))
if (!(cft = dm_config_create()))
return_NULL;
if (!dm_config_parse(cft, config_settings, config_settings + strlen(config_settings))) {
@ -227,88 +189,6 @@ struct dm_config_tree *dm_config_from_string(const char *config_settings)
return cft;
}
/*
* Doesn't populate filename if the file is empty.
*/
int dm_config_check_file(struct dm_config_tree *cft, const char **filename, struct stat *info)
{
struct cs *c = (struct cs *) cft;
struct stat _info;
if (!info)
info = &_info;
if (stat(c->filename, info)) {
log_sys_error("stat", c->filename);
c->exists = 0;
return 0;
}
if (!S_ISREG(info->st_mode)) {
log_error("%s is not a regular file", c->filename);
c->exists = 0;
return 0;
}
c->exists = 1;
c->timestamp = info->st_ctime;
c->st_size = info->st_size;
if (info->st_size == 0)
log_verbose("%s is empty", c->filename);
else if (filename)
*filename = c->filename;
return 1;
}
time_t dm_config_timestamp(struct dm_config_tree *cft)
{
struct cs *c = (struct cs *) cft;
return c->timestamp;
}
/*
* Return 1 if config files ought to be reloaded
*/
int dm_config_changed(struct dm_config_tree *cft)
{
struct cs *c = (struct cs *) cft;
struct stat info;
if (!c->filename)
return 0;
if (stat(c->filename, &info) == -1) {
/* Ignore a deleted config file: still use original data */
if (errno == ENOENT) {
if (!c->exists)
return 0;
log_very_verbose("Config file %s has disappeared!",
c->filename);
goto reload;
}
log_sys_error("stat", c->filename);
log_error("Failed to reload configuration files");
return 0;
}
if (!S_ISREG(info.st_mode)) {
log_error("Configuration file %s is not a regular file",
c->filename);
goto reload;
}
/* Unchanged? */
if (c->timestamp == info.st_ctime && c->st_size == info.st_size)
return 0;
reload:
log_verbose("Detected config file change to %s", c->filename);
return 1;
}
static int _line_start(struct output_line *outline)
{
if (!dm_pool_begin_object(outline->mem, 128)) {
@ -1242,24 +1122,22 @@ struct dm_config_node *dm_config_clone_node_with_mem(struct dm_pool *mem, const
struct dm_config_node *dm_config_clone_node(struct dm_config_tree *cft, const struct dm_config_node *node, int sib)
{
struct cs *c = (struct cs *) cft;
return dm_config_clone_node_with_mem(c->mem, node, sib);
return dm_config_clone_node_with_mem(cft->mem, node, sib);
}
struct dm_config_node *dm_config_create_node(struct dm_config_tree *cft, const char *key)
{
struct cs *c = (struct cs *) cft;
struct dm_config_node *cn;
if (!(cn = _create_node(c->mem))) {
if (!(cn = _create_node(cft->mem))) {
log_error("Failed to create config node.");
return NULL;
}
if (!(cn->key = dm_pool_strdup(c->mem, key))) {
if (!(cn->key = dm_pool_strdup(cft->mem, key))) {
log_error("Failed to create config node's key.");
return NULL;
}
if (!(cn->v = _create_value(c->mem))) {
if (!(cn->v = _create_value(cft->mem))) {
log_error("Failed to create config node's value.");
return NULL;
}
@ -1272,12 +1150,10 @@ struct dm_config_node *dm_config_create_node(struct dm_config_tree *cft, const c
struct dm_config_value *dm_config_create_value(struct dm_config_tree *cft)
{
struct cs *c = (struct cs *) cft;
return _create_value(c->mem);
return _create_value(cft->mem);
}
struct dm_pool *dm_config_memory(struct dm_config_tree *cft)
{
struct cs *c = (struct cs *) cft;
return c->mem;
return cft->mem;
}