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Introducing a new IO class caching rule - file name prefix

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Signed-off-by: Mariusz Barczak <mariusz.barczak@intel.com>
Signed-off-by: Robert Baldyga <robert.baldyga@intel.com>
This commit is contained in:
Mariusz Barczak 2019-12-11 10:13:09 +01:00 committed by Robert Baldyga
parent 9c7b485cef
commit 7facb1e926
2 changed files with 50 additions and 2 deletions
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49
modules/cas_cache/classifier.c
View File

@ -190,14 +190,21 @@ error:
static int _cas_cls_string_ctr(struct cas_classifier *cls,
struct cas_cls_condition *c, char *data)
{
size_t len;
struct cas_cls_string *ctx;
if (!data || strlen(data) == 0) {
if (!data) {
CAS_CLS_MSG(KERN_ERR, "Missing string specifier\n");
return -EINVAL;
}
if (strlen(data) > MAX_STRING_SPECIFIER_LEN) {
len = strlen(data);
if (len == 0) {
CAS_CLS_MSG(KERN_ERR, "String specifier is empty\n");
return -EINVAL;
}
if (len > MAX_STRING_SPECIFIER_LEN) {
CAS_CLS_MSG(KERN_ERR, "String specifier to long: %s\n", data);
return -EINVAL;
}
@ -207,6 +214,7 @@ static int _cas_cls_string_ctr(struct cas_classifier *cls,
return -ENOMEM;
strcpy(ctx->string, data);
ctx->len = len;
c->context = ctx;
@ -477,6 +485,41 @@ static cas_cls_eval_t _cas_cls_extension_test(
return cas_cls_eval_no;
}
/* File name prefix test function */
static cas_cls_eval_t _cas_cls_file_name_prefix_test(
struct cas_classifier *cls, struct cas_cls_condition *c,
struct cas_cls_io *io, ocf_part_id_t part_id)
{
struct cas_cls_string *ctx;
struct inode *inode;
struct dentry *dentry;
uint32_t len;
ctx = c->context;
inode = io->inode;
if (!inode)
return cas_cls_eval_no;
/* I/O target inode dentry */
dentry = _cas_cls_dir_get_inode_dentry(inode);
/* Check if dentry and its name is valid */
if (!dentry || !dentry->d_name.name)
return cas_cls_eval_no;
/* Check if name is not too short, we expect full prefix in name */
if (dentry->d_name.len < ctx->len)
return cas_cls_eval_no;
/* Final string comparison check */
len = min(ctx->len, dentry->d_name.len);
if (strncmp(dentry->d_name.name, ctx->string, len) == 0)
return cas_cls_eval_yes;
return cas_cls_eval_no;
}
/* LBA test function */
static cas_cls_eval_t _cas_cls_lba_test(
struct cas_classifier *cls, struct cas_cls_condition *c,
@ -566,6 +609,8 @@ static struct cas_cls_condition_handler _handlers[] = {
_cas_cls_directory_dtr },
{ "extension", _cas_cls_extension_test, _cas_cls_string_ctr,
_cas_cls_generic_dtr },
{ "file_name_prefix", _cas_cls_file_name_prefix_test, _cas_cls_string_ctr,
_cas_cls_generic_dtr },
{ "lba", _cas_cls_lba_test, _cas_cls_numeric_ctr, _cas_cls_generic_dtr },
{ "pid", _cas_cls_pid_test, _cas_cls_numeric_ctr, _cas_cls_generic_dtr },
{ "process_name", _cas_cls_process_name_test, _cas_cls_string_ctr,

3
modules/cas_cache/classifier_defs.h
View File

@ -124,6 +124,9 @@ struct cas_cls_numeric {
struct cas_cls_string {
/* String specifier*/
char string[MAX_STRING_SPECIFIER_LEN];
/* String length */
uint32_t len;
};
/* Directory condition context */