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device_mapper: use on stack allocation

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Reduce number of heap allocation calls and for smaller
locally used string, use on stack allocation.
This commit is contained in:
Zdenek Kabelac 2024-10-21 14:16:23 +02:00
parent d8996a2a12
commit f59fa69507
2 changed files with 32 additions and 18 deletions
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25
device_mapper/libdm-report.c
View File

@ -4484,6 +4484,7 @@ static const char *_get_field_id(struct dm_report *rh, struct dm_report_field *f
static int _output_field_basic_fmt(struct dm_report *rh, struct dm_report_field *field)
{
char buf_local[8192];
char *field_id;
int32_t width;
uint32_t align;
@ -4491,25 +4492,26 @@ static int _output_field_basic_fmt(struct dm_report *rh, struct dm_report_field
size_t buf_size = 0;
if (rh->flags & DM_REPORT_OUTPUT_FIELD_NAME_PREFIX) {
if (!(field_id = strdup(_get_field_id(rh, field)))) {
log_error("dm_report: Failed to copy field name");
buf_size = strlen(_get_field_id(rh, field)) + 1;
if (buf_size >= sizeof(buf_local)) {
/* for field names our buf_local should be enough */
log_error(UNABLE_TO_EXTEND_OUTPUT_LINE_MSG);
return 0;
}
field_id = buf_local;
memcpy(field_id, _get_field_id(rh, field), buf_size);
if (!dm_pool_grow_object(rh->mem, rh->output_field_name_prefix, 0)) {
log_error(UNABLE_TO_EXTEND_OUTPUT_LINE_MSG);
free(field_id);
return 0;
}
if (!dm_pool_grow_object(rh->mem, _toupperstr(field_id), 0)) {
log_error(UNABLE_TO_EXTEND_OUTPUT_LINE_MSG);
free(field_id);
return 0;
}
free(field_id);
if (!dm_pool_grow_object(rh->mem, STANDARD_PAIR, 1)) {
log_error(UNABLE_TO_EXTEND_OUTPUT_LINE_MSG);
return 0;
@ -4532,7 +4534,10 @@ static int _output_field_basic_fmt(struct dm_report *rh, struct dm_report_field
/* Including trailing '\0'! */
buf_size = width + 1;
if (!(buf = malloc(buf_size))) {
if (buf_size < sizeof(buf_local))
/* Use local buffer on stack for smaller strings */
buf = buf_local;
else if (!(buf = malloc(buf_size))) {
log_error("dm_report: Could not allocate memory for output line buffer.");
return 0;
}
@ -4574,10 +4579,12 @@ static int _output_field_basic_fmt(struct dm_report *rh, struct dm_report_field
}
}
free(buf);
if (buf != buf_local)
free(buf);
return 1;
bad:
free(buf);
if (buf != buf_local)
free(buf);
return 0;
}

25
libdm/libdm-report.c
View File

@ -4482,6 +4482,7 @@ static const char *_get_field_id(struct dm_report *rh, struct dm_report_field *f
static int _output_field_basic_fmt(struct dm_report *rh, struct dm_report_field *field)
{
char buf_local[8192];
char *field_id;
int32_t width;
uint32_t align;
@ -4489,25 +4490,26 @@ static int _output_field_basic_fmt(struct dm_report *rh, struct dm_report_field
size_t buf_size = 0;
if (rh->flags & DM_REPORT_OUTPUT_FIELD_NAME_PREFIX) {
if (!(field_id = strdup(_get_field_id(rh, field)))) {
log_error("dm_report: Failed to copy field name");
buf_size = strlen(_get_field_id(rh, field)) + 1;
if (buf_size >= sizeof(buf_local)) {
/* for field names our buf_local should be enough */
log_error(UNABLE_TO_EXTEND_OUTPUT_LINE_MSG);
return 0;
}
field_id = buf_local;
memcpy(field_id, _get_field_id(rh, field), buf_size);
if (!dm_pool_grow_object(rh->mem, rh->output_field_name_prefix, 0)) {
log_error(UNABLE_TO_EXTEND_OUTPUT_LINE_MSG);
dm_free(field_id);
return 0;
}
if (!dm_pool_grow_object(rh->mem, _toupperstr(field_id), 0)) {
log_error(UNABLE_TO_EXTEND_OUTPUT_LINE_MSG);
dm_free(field_id);
return 0;
}
dm_free(field_id);
if (!dm_pool_grow_object(rh->mem, STANDARD_PAIR, 1)) {
log_error(UNABLE_TO_EXTEND_OUTPUT_LINE_MSG);
return 0;
@ -4530,7 +4532,10 @@ static int _output_field_basic_fmt(struct dm_report *rh, struct dm_report_field
/* Including trailing '\0'! */
buf_size = width + 1;
if (!(buf = dm_malloc(buf_size))) {
if (buf_size < sizeof(buf_local))
/* Use local buffer on stack for smaller strings */
buf = buf_local;
else if (!(buf = dm_malloc(buf_size))) {
log_error("dm_report: Could not allocate memory for output line buffer.");
return 0;
}
@ -4572,10 +4577,12 @@ static int _output_field_basic_fmt(struct dm_report *rh, struct dm_report_field
}
}
dm_free(buf);
if (buf != buf_local)
dm_free(buf);
return 1;
bad:
dm_free(buf);
if (buf != buf_local)
dm_free(buf);
return 0;
}