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Replace dynamic buffer allocations for PATH_MAX

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Use static buffer instead of stack allocated buffer.
This reduces stack size usage of lvm tool and the
change is very simple.

Since the whole library is not thread safe - it should not
add any new problems - and if there will be some conversion
it's easy to convert this to use some preallocated buffer.
This commit is contained in:
Zdenek Kabelac 2011-11-18 19:31:09 +00:00
parent 8deeeb07ea
commit 900f5f8187
6 changed files with 21 additions and 20 deletions
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1
WHATS_NEW
View File

@ -1,5 +1,6 @@
Version 2.02.89 -
==================================
Reduce stack allocation of some PATH_MAX sized char buffers.
Unlock memory before writing metadata.
Add query before removing snapshots when inactive snapshot origin is removed.
Allow changing availability state of snapshots.

4
lib/activate/activate.c
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@ -38,7 +38,7 @@
int lvm1_present(struct cmd_context *cmd)
{
char path[PATH_MAX];
static char path[PATH_MAX];
if (dm_snprintf(path, sizeof(path), "%s/lvm/global", cmd->proc_dir)
< 0) {
@ -294,7 +294,7 @@ static int _passes_activation_filter(struct cmd_context *cmd,
const struct dm_config_node *cn;
const struct dm_config_value *cv;
const char *str;
char path[PATH_MAX];
static char path[PATH_MAX];
if (!(cn = find_config_tree_node(cmd, "activation/volume_list"))) {
log_verbose("activation/volume_list configuration setting "

12
lib/activate/fs.c
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@ -36,7 +36,7 @@ static int _fs_create = 0;
static int _mk_dir(const char *dev_dir, const char *vg_name)
{
char vg_path[PATH_MAX];
static char vg_path[PATH_MAX];
mode_t old_umask;
if (dm_snprintf(vg_path, sizeof(vg_path), "%s%s",
@ -67,7 +67,7 @@ static int _mk_dir(const char *dev_dir, const char *vg_name)
static int _rm_dir(const char *dev_dir, const char *vg_name)
{
char vg_path[PATH_MAX];
static char vg_path[PATH_MAX];
if (dm_snprintf(vg_path, sizeof(vg_path), "%s%s",
dev_dir, vg_name) == -1) {
@ -87,7 +87,7 @@ static int _rm_dir(const char *dev_dir, const char *vg_name)
static void _rm_blks(const char *dir)
{
const char *name;
char path[PATH_MAX];
static char path[PATH_MAX];
struct dirent *dirent;
struct stat buf;
DIR *d;
@ -124,8 +124,8 @@ static void _rm_blks(const char *dir)
static int _mk_link(const char *dev_dir, const char *vg_name,
const char *lv_name, const char *dev, int check_udev)
{
char lv_path[PATH_MAX], link_path[PATH_MAX], lvm1_group_path[PATH_MAX];
char vg_path[PATH_MAX];
static char lv_path[PATH_MAX], link_path[PATH_MAX], lvm1_group_path[PATH_MAX];
static char vg_path[PATH_MAX];
struct stat buf, buf_lp;
if (dm_snprintf(vg_path, sizeof(vg_path), "%s%s",
@ -226,7 +226,7 @@ static int _rm_link(const char *dev_dir, const char *vg_name,
const char *lv_name, int check_udev)
{
struct stat buf;
char lv_path[PATH_MAX];
static char lv_path[PATH_MAX];
if (dm_snprintf(lv_path, sizeof(lv_path), "%s%s/%s",
dev_dir, vg_name, lv_name) == -1) {

6
lib/commands/toolcontext.c
View File

@ -477,7 +477,7 @@ static int _init_tags(struct cmd_context *cmd, struct dm_config_tree *cft)
static int _load_config_file(struct cmd_context *cmd, const char *tag)
{
char config_file[PATH_MAX] = "";
static char config_file[PATH_MAX] = "";
const char *filler = "";
struct stat info;
struct config_tree_list *cfl;
@ -786,10 +786,10 @@ err:
static int _init_filters(struct cmd_context *cmd, unsigned load_persistent_cache)
{
static char cache_file[PATH_MAX];
const char *dev_cache = NULL, *cache_dir, *cache_file_prefix;
struct dev_filter *f3, *f4;
struct stat st;
char cache_file[PATH_MAX];
cmd->dump_filter = 0;
@ -1138,8 +1138,8 @@ static int _init_hostname(struct cmd_context *cmd)
static int _init_backup(struct cmd_context *cmd)
{
static char default_dir[PATH_MAX];
uint32_t days, min;
char default_dir[PATH_MAX];
const char *dir;
if (!cmd->system_dir[0]) {

2
lib/format_text/format-text.c
View File

@ -1791,6 +1791,7 @@ static void *_create_text_context(struct dm_pool *mem, struct text_context *tc)
static int _create_vg_text_instance(struct format_instance *fid,
const struct format_instance_ctx *fic)
{
static char path[PATH_MAX];
uint32_t type = fic->type;
struct text_fid_context *fidtc;
struct metadata_area *mda;
@ -1798,7 +1799,6 @@ static int _create_vg_text_instance(struct format_instance *fid,
struct dir_list *dl;
struct raw_list *rl;
struct dm_list *dir_list, *raw_list;
char path[PATH_MAX];
struct text_context tc;
struct lvmcache_vginfo *vginfo;
struct lvmcache_info *info;

16
lib/metadata/metadata.c
View File

@ -452,12 +452,12 @@ int move_pvs_used_by_lv(struct volume_group *vg_from,
static int validate_new_vg_name(struct cmd_context *cmd, const char *vg_name)
{
char vg_path[PATH_MAX];
static char vg_path[PATH_MAX];
if (!validate_name(vg_name))
return_0;
snprintf(vg_path, PATH_MAX, "%s%s", cmd->dev_dir, vg_name);
snprintf(vg_path, sizeof(vg_path), "%s%s", cmd->dev_dir, vg_name);
if (path_exists(vg_path)) {
log_error("%s: already exists in filesystem", vg_path);
return 0;
@ -4201,7 +4201,7 @@ static int _convert_key_to_string(const char *key, size_t key_len,
int fid_add_mda(struct format_instance *fid, struct metadata_area *mda,
const char *key, size_t key_len, const unsigned sub_key)
{
char full_key[PATH_MAX];
static char full_key[PATH_MAX];
dm_list_add(mda_is_ignored(mda) ? &fid->metadata_areas_ignored :
&fid->metadata_areas_in_use, &mda->list);
@ -4212,7 +4212,7 @@ int fid_add_mda(struct format_instance *fid, struct metadata_area *mda,
/* Add metadata area to index. */
if (fid->type & FMT_INSTANCE_VG) {
if (!_convert_key_to_string(key, key_len, sub_key,
full_key, PATH_MAX))
full_key, sizeof(full_key)))
return_0;
dm_hash_insert(fid->metadata_areas_index.hash,
@ -4246,13 +4246,13 @@ struct metadata_area *fid_get_mda_indexed(struct format_instance *fid,
const char *key, size_t key_len,
const unsigned sub_key)
{
char full_key[PATH_MAX];
static char full_key[PATH_MAX];
struct metadata_area *mda = NULL;
if (fid->type & FMT_INSTANCE_VG) {
if (!_convert_key_to_string(key, key_len, sub_key,
full_key, PATH_MAX))
full_key, sizeof(full_key)))
return_NULL;
mda = (struct metadata_area *) dm_hash_lookup(fid->metadata_areas_index.hash,
full_key);
@ -4266,8 +4266,8 @@ struct metadata_area *fid_get_mda_indexed(struct format_instance *fid,
int fid_remove_mda(struct format_instance *fid, struct metadata_area *mda,
const char *key, size_t key_len, const unsigned sub_key)
{
static char full_key[PATH_MAX];
struct metadata_area *mda_indexed = NULL;
char full_key[PATH_MAX];
/* At least one of mda or key must be specified. */
if (!mda && !key)
@ -4287,7 +4287,7 @@ int fid_remove_mda(struct format_instance *fid, struct metadata_area *mda,
if (fid->type & FMT_INSTANCE_VG) {
if (!_convert_key_to_string(key, key_len, sub_key,
full_key, PATH_MAX))
full_key, sizeof(full_key)))
return_0;
dm_hash_remove(fid->metadata_areas_index.hash, full_key);