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cas_cache: Generic classifier for string conditions.

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Signed-off-by: Michal Mielewczyk <michal.mielewczyk@intel.com>
This commit is contained in:
Michal Mielewczyk 2019-07-17 09:53:52 -04:00
parent 5603a77302
commit e36c8c53c6
2 changed files with 36 additions and 0 deletions
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28
modules/cas_cache/classifier.c
View File

@ -185,6 +185,34 @@ error:
return result; return result;
} }
/* String condition constructor. @data is expected to contain string
* to be matched. */
static int _cas_cls_string_ctr(struct cas_classifier *cls,
struct cas_cls_condition *c, char *data)
{
struct cas_cls_string *ctx;
if (!data || strlen(data) == 0) {
CAS_CLS_MSG(KERN_ERR, "Missing string specifier\n");
return -EINVAL;
}
if (strlen(data) > MAX_STRING_SPECIFIER_LEN) {
CAS_CLS_MSG(KERN_ERR, "String specifier to long: %s\n", data);
return -EINVAL;
}
ctx = kmalloc(sizeof(*ctx), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
strcpy(ctx->string, data);
c->context = ctx;
return 0;
}
/* Unsigned int numeric test function */ /* Unsigned int numeric test function */
static cas_cls_eval_t _cas_cls_numeric_test_u( static cas_cls_eval_t _cas_cls_numeric_test_u(
struct cas_cls_condition *c, uint64_t val) struct cas_cls_condition *c, uint64_t val)

8
modules/cas_cache/classifier_defs.h
View File

@ -6,6 +6,8 @@
#ifndef __CLASSIFIER_DEFS_H__ #ifndef __CLASSIFIER_DEFS_H__
#define __CLASSIFIER_DEFS_H__ #define __CLASSIFIER_DEFS_H__
#define MAX_STRING_SPECIFIER_LEN 256
/* Rule matches 1:1 with io class. It contains multiple conditions with /* Rule matches 1:1 with io class. It contains multiple conditions with
* associated logical operator (and/or) */ * associated logical operator (and/or) */
struct cas_cls_rule { struct cas_cls_rule {
@ -118,6 +120,12 @@ struct cas_cls_numeric {
uint64_t v_u64; uint64_t v_u64;
}; };
/* String condition context */
struct cas_cls_string {
/* String specifier*/
char string[MAX_STRING_SPECIFIER_LEN];
};
/* Directory condition context */ /* Directory condition context */
struct cas_cls_directory { struct cas_cls_directory {
/* 1 if directory had been resolved */ /* 1 if directory had been resolved */