10/12 - user_interface_shares
Adds attr_store and attr_show support for shares file.
--
Signed-Off-By: Chandra Seetharaman <[email protected]>
Signed-Off-By: Shailabh Nagar <[email protected]>
Signed-Off-By: Matt Helsley <[email protected]>
rgcs.c | 136 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 136 insertions(+)
Index: linux-2617-rc3/kernel/res_group/rgcs.c
===================================================================
--- linux-2617-rc3.orig/kernel/res_group/rgcs.c 2006-04-27 10:18:45.000000000 -0700
+++ linux-2617-rc3/kernel/res_group/rgcs.c 2006-04-27 10:18:47.000000000 -0700
@@ -21,6 +21,9 @@
#include "local.h"
#define RES_STRING "res"
+#define MIN_SHARES_STRING "min_shares"
+#define MAX_SHARES_STRING "max_shares"
+#define CHILD_SHARES_DIVISOR_STRING "child_shares_divisor"
static ssize_t show_stats(struct resource_group *rgroup, char *buf)
{
@@ -117,6 +120,128 @@ done:
return rc;
}
+
+enum share_token_t {
+ MIN_SHARES_TOKEN,
+ MAX_SHARES_TOKEN,
+ CHILD_SHARES_DIVISOR_TOKEN,
+ RESOURCE_TYPE_TOKEN,
+ ERROR_TOKEN
+};
+
+/* Token matching for parsing input to this magic file */
+static match_table_t shares_tokens = {
+ {RESOURCE_TYPE_TOKEN, RES_STRING"=%s"},
+ {MIN_SHARES_TOKEN, MIN_SHARES_STRING"=%d"},
+ {MAX_SHARES_TOKEN, MAX_SHARES_STRING"=%d"},
+ {CHILD_SHARES_DIVISOR_TOKEN, CHILD_SHARES_DIVISOR_STRING"=%d"},
+ {ERROR_TOKEN, NULL}
+};
+
+static int shares_parse(const char *options, char **resname,
+ struct res_shares *shares)
+{
+ char *p;
+ int option, rc = -EINVAL;
+
+ *resname = NULL;
+ if (!options)
+ goto done;
+ while ((p = strsep((char **)&options, ",")) != NULL) {
+ substring_t args[MAX_OPT_ARGS];
+ int token;
+
+ if (!*p)
+ continue;
+ token = match_token(p, shares_tokens, args);
+ switch (token) {
+ case RESOURCE_TYPE_TOKEN:
+ if (*resname)
+ goto done;
+ *resname = match_strdup(args);
+ break;
+ case MIN_SHARES_TOKEN:
+ if (match_int(args, &option))
+ goto done;
+ shares->min_shares = option;
+ break;
+ case MAX_SHARES_TOKEN:
+ if (match_int(args, &option))
+ goto done;
+ shares->max_shares = option;
+ break;
+ case CHILD_SHARES_DIVISOR_TOKEN:
+ if (match_int(args, &option))
+ goto done;
+ shares->child_shares_divisor = option;
+ break;
+ default:
+ goto done;
+ }
+ }
+ rc = 0;
+done:
+ if (rc) {
+ kfree(*resname);
+ *resname = NULL;
+ }
+ return rc;
+}
+
+static int set_shares(struct resource_group *rgroup, const char *str)
+{
+ char *resname = NULL;
+ int rc;
+ struct res_controller *ctlr;
+ struct res_shares shares = {
+ .min_shares = SHARE_UNCHANGED,
+ .max_shares = SHARE_UNCHANGED,
+ .child_shares_divisor = SHARE_UNCHANGED,
+ };
+
+ rc = shares_parse(str, &resname, &shares);
+ if (!rc) {
+ ctlr = get_controller_by_name(resname);
+ if (ctlr) {
+ rc = set_controller_shares(rgroup, ctlr, &shares);
+ put_controller(ctlr);
+ } else
+ rc = -EINVAL;
+ kfree(resname);
+ }
+ return rc;
+}
+
+static ssize_t show_shares(struct resource_group *rgroup, char *buf)
+{
+ int i;
+ ssize_t j, rc = 0, bufsize = PAGE_SIZE;
+ struct res_shares *shares;
+ struct res_controller *ctlr;
+
+ for (i = 0; i < MAX_RES_CTLRS; i++) {
+ ctlr = get_controller_by_id(i);
+ if (!ctlr)
+ continue;
+ shares = get_controller_shares(rgroup, ctlr);
+ if (shares) {
+ if (bufsize <= 0)
+ break;
+ j = snprintf(buf, bufsize, "%s=%s,%s=%d,%s=%d,%s=%d\n",
+ RES_STRING, ctlr->name,
+ MIN_SHARES_STRING, shares->min_shares,
+ MAX_SHARES_STRING, shares->max_shares,
+ CHILD_SHARES_DIVISOR_STRING,
+ shares->child_shares_divisor);
+ rc += j; buf += j; bufsize -= j;
+ }
+ put_controller(ctlr);
+ }
+ if (i < MAX_RES_CTLRS)
+ rc = -ENOSPC;
+ return rc;
+}
+
struct rgroup_attribute {
struct configfs_attribute configfs_attr;
ssize_t (*show)(struct resource_group *, char *);
@@ -133,6 +258,16 @@ struct rgroup_attribute stats_attr = {
.store = reset_stats
};
+struct rgroup_attribute shares_attr = {
+ .configfs_attr = {
+ .ca_name = "shares",
+ .ca_owner = THIS_MODULE,
+ .ca_mode = S_IRUGO | S_IWUSR
+ },
+ .show = show_shares,
+ .store = set_shares
+};
+
static struct configfs_subsystem rgcs_subsys;
static struct config_item_type rgcs_item_type;
@@ -281,6 +416,7 @@ static struct configfs_group_operations
static struct configfs_attribute *rgroup_attrs[] = {
&stats_attr.configfs_attr,
+ &shares_attr.configfs_attr,
NULL
};
--
----------------------------------------------------------------------
Chandra Seetharaman | Be careful what you choose....
- [email protected] | .......you may get it.
----------------------------------------------------------------------
-
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