On 03/09/2012 03:20 PM, Jeff Liu wrote:
Introduce a new disk space parse strategy routine for cgroup quota supports.
disk_space_parse() is simply copied from mmparse() with Petabytes and Terabytes parse.
Signed-off-by: Jie Liu<jeff.liu@xxxxxxxxxx>
---
include/linux/res_counter.h | 3 ++
kernel/res_counter.c | 58 +++++++++++++++++++++++++++++++++++++++++++
2 files changed, 61 insertions(+), 0 deletions(-)
diff --git a/include/linux/res_counter.h b/include/linux/res_counter.h
index c9d625c..f8ce315 100644
--- a/include/linux/res_counter.h
+++ b/include/linux/res_counter.h
@@ -79,6 +79,9 @@ typedef int (*write_strategy_fn)(const char *buf, unsigned long long *val);
int res_counter_memparse_write_strategy(const char *buf,
unsigned long long *res);
+int res_counter_diskspace_parse_write_strategy(const char *buf,
+ unsigned long long *res);
+
int res_counter_write(struct res_counter *counter, int member,
const char *buffer, write_strategy_fn write_strategy);
diff --git a/kernel/res_counter.c b/kernel/res_counter.c
index 34683ef..42c1623 100644
--- a/kernel/res_counter.c
+++ b/kernel/res_counter.c
@@ -145,6 +145,64 @@ u64 res_counter_read_u64(struct res_counter *counter, int member)
}
#endif
+/*
+ * Copy from memparse(), add terabytes, petabytes parse support.
+ */
Don't see a reason for that. It is all bytes and such, just add the
modifiers you want to the normal parse...
+unsigned long long disk_space_parse(const char *ptr, char **retptr)
+{
+ char *endptr; /* local pointer to end of parsed string */
+ unsigned long long ret = kstrtoull(ptr,&endptr, 0);
+
+ switch (*endptr) {
+ case 'P':
+ case 'p':
+ ret<<= 10;
+ case 'T':
+ case 't':
+ ret<<= 10;
+ case 'G':
+ case 'g':
+ ret<<= 10;
+ case 'M':
+ case 'm':
+ ret<<= 10;
+ case 'K':
+ case 'k':
+ ret<<= 10;
+ endptr++;
+ default:
+ break;
+ }
+
+ if (retptr)
+ *retptr = endptr;
+
+ return ret;
+}
+
+int res_counter_diskspace_parse_write_strategy(const char *buf,
+ unsigned long long *res)
+{
+ char *end;
+
+ /* return RESOURCE_MAX(unlimited) if "-1" is specified */
+ if (*buf == '-') {
+ *res = kstrtoull(buf + 1,&end, 10);
+ if (*res != 1 || *end != '\0')
+ return -EINVAL;
+ *res = RESOURCE_MAX;
+ return 0;
+ }
+
+ /* FIXME - make memparse() take const char* args */
+ *res = disk_space_parse((char *)buf,&end);
+ if (*end != '\0')
+ return -EINVAL;
+
+ /* FIXME - need to return *res as block aligned? */
+ return 0;
+}
+
int res_counter_memparse_write_strategy(const char *buf,
unsigned long long *res)
{
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