From: Douglas Fuller <dfuller@xxxxxxxxxx>
Add an interface for the Ceph OSD lock.lock_info method and associated
data structures.
Based heavily on code by Mike Christie <michaelc@xxxxxxxxxxx>.
Signed-off-by: Douglas Fuller <dfuller@xxxxxxxxxx>
[idryomov@xxxxxxxxx: refactor, misc fixes throughout]
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
---
include/linux/ceph/cls_lock_client.h | 22 ++++++
net/ceph/cls_lock_client.c | 145 +++++++++++++++++++++++++++++++++++
2 files changed, 167 insertions(+)
diff --git a/include/linux/ceph/cls_lock_client.h b/include/linux/ceph/cls_lock_client.h
index 4e4dffef22bb..84884d8d4710 100644
--- a/include/linux/ceph/cls_lock_client.h
+++ b/include/linux/ceph/cls_lock_client.h
@@ -9,6 +9,20 @@ enum ceph_cls_lock_type {
CEPH_CLS_LOCK_SHARED = 2,
};
+struct ceph_locker_id {
+ struct ceph_entity_name name; /* locker's client name */
+ char *cookie; /* locker's cookie */
+};
+
+struct ceph_locker_info {
+ struct ceph_entity_addr addr; /* locker's address */
+};
+
+struct ceph_locker {
+ struct ceph_locker_id id;
+ struct ceph_locker_info info;
+};
+
int ceph_cls_lock(struct ceph_osd_client *osdc,
struct ceph_object_id *oid,
struct ceph_object_locator *oloc,
@@ -24,4 +38,12 @@ int ceph_cls_break_lock(struct ceph_osd_client *osdc,
char *lock_name, char *cookie,
struct ceph_entity_name *locker);
+void ceph_free_lockers(struct ceph_locker *lockers, u32 num_lockers);
+
+int ceph_cls_lock_info(struct ceph_osd_client *osdc,
+ struct ceph_object_id *oid,
+ struct ceph_object_locator *oloc,
+ char *lock_name, u8 *type, char **tag,
+ struct ceph_locker **lockers, u32 *num_lockers);
+
#endif
diff --git a/net/ceph/cls_lock_client.c b/net/ceph/cls_lock_client.c
index 2a314537f958..50f040fdb2a9 100644
--- a/net/ceph/cls_lock_client.c
+++ b/net/ceph/cls_lock_client.c
@@ -178,3 +178,148 @@ int ceph_cls_break_lock(struct ceph_osd_client *osdc,
return ret;
}
EXPORT_SYMBOL(ceph_cls_break_lock);
+
+void ceph_free_lockers(struct ceph_locker *lockers, u32 num_lockers)
+{
+ int i;
+
+ for (i = 0; i < num_lockers; i++)
+ kfree(lockers[i].id.cookie);
+ kfree(lockers);
+}
+EXPORT_SYMBOL(ceph_free_lockers);
+
+static int decode_locker(void **p, void *end, struct ceph_locker *locker)
+{
+ u8 struct_v;
+ u32 len;
+ char *s;
+ int ret;
+
+ ret = ceph_start_decoding(p, end, 1, "locker_id_t", &struct_v, &len);
+ if (ret)
+ return ret;
+
+ ceph_decode_copy(p, &locker->id.name, sizeof(locker->id.name));
+ s = ceph_extract_encoded_string(p, end, NULL, GFP_NOIO);
+ if (IS_ERR(s))
+ return PTR_ERR(s);
+
+ locker->id.cookie = s;
+
+ ret = ceph_start_decoding(p, end, 1, "locker_info_t", &struct_v, &len);
+ if (ret)
+ return ret;
+
+ *p += sizeof(struct ceph_timespec); /* skip expiration */
+ ceph_decode_copy(p, &locker->info.addr, sizeof(locker->info.addr));
+ ceph_decode_addr(&locker->info.addr);
+ len = ceph_decode_32(p);
+ *p += len; /* skip description */
+
+ dout("%s %s%llu cookie %s addr %s\n", __func__,
+ ENTITY_NAME(locker->id.name), locker->id.cookie,
+ ceph_pr_addr(&locker->info.addr.in_addr));
+ return 0;
+}
+
+static int decode_lockers(void **p, void *end, u8 *type, char **tag,
+ struct ceph_locker **lockers, u32 *num_lockers)
+{
+ u8 struct_v;
+ u32 struct_len;
+ char *s;
+ int i;
+ int ret;
+
+ ret = ceph_start_decoding(p, end, 1, "cls_lock_get_info_reply",
+ &struct_v, &struct_len);
+ if (ret)
+ return ret;
+
+ *num_lockers = ceph_decode_32(p);
+ *lockers = kcalloc(*num_lockers, sizeof(**lockers), GFP_NOIO);
+ if (!*lockers)
+ return -ENOMEM;
+
+ for (i = 0; i < *num_lockers; i++) {
+ ret = decode_locker(p, end, *lockers + i);
+ if (ret)
+ goto err_free_lockers;
+ }
+
+ *type = ceph_decode_8(p);
+ s = ceph_extract_encoded_string(p, end, NULL, GFP_NOIO);
+ if (IS_ERR(s)) {
+ ret = PTR_ERR(s);
+ goto err_free_lockers;
+ }
+
+ *tag = s;
+ return 0;
+
+err_free_lockers:
+ ceph_free_lockers(*lockers, *num_lockers);
+ return ret;
+}
+
+/*
+ * On success, the caller is responsible for:
+ *
+ * kfree(tag);
+ * ceph_free_lockers(lockers, num_lockers);
+ */
+int ceph_cls_lock_info(struct ceph_osd_client *osdc,
+ struct ceph_object_id *oid,
+ struct ceph_object_locator *oloc,
+ char *lock_name, u8 *type, char **tag,
+ struct ceph_locker **lockers, u32 *num_lockers)
+{
+ int get_info_op_buf_size;
+ int name_len = strlen(lock_name);
+ struct page *get_info_op_page, *reply_page;
+ size_t reply_len;
+ void *p, *end;
+ int ret;
+
+ get_info_op_buf_size = name_len + sizeof(__le32) +
+ CEPH_ENCODING_START_BLK_LEN;
+ if (get_info_op_buf_size > PAGE_SIZE)
+ return -E2BIG;
+
+ get_info_op_page = alloc_page(GFP_NOIO);
+ if (!get_info_op_page)
+ return -ENOMEM;
+
+ reply_page = alloc_page(GFP_NOIO);
+ if (!reply_page) {
+ __free_page(get_info_op_page);
+ return -ENOMEM;
+ }
+
+ p = page_address(get_info_op_page);
+ end = p + get_info_op_buf_size;
+
+ /* encode cls_lock_get_info_op struct */
+ ceph_start_encoding(&p, 1, 1,
+ get_info_op_buf_size - CEPH_ENCODING_START_BLK_LEN);
+ ceph_encode_string(&p, end, lock_name, name_len);
+
+ dout("%s lock_name %s\n", __func__, lock_name);
+ ret = ceph_osdc_call(osdc, oid, oloc, "lock", "get_info",
+ CEPH_OSD_FLAG_READ, get_info_op_page,
+ get_info_op_buf_size, reply_page, &reply_len);
+
+ dout("%s: status %d\n", __func__, ret);
+ if (ret >= 0) {
+ p = page_address(reply_page);
+ end = p + reply_len;
+
+ ret = decode_lockers(&p, end, type, tag, lockers, num_lockers);
+ }
+
+ __free_page(get_info_op_page);
+ __free_page(reply_page);
+ return ret;
+}
+EXPORT_SYMBOL(ceph_cls_lock_info);
--
2.4.3
--
To unsubscribe from this list: send the line "unsubscribe ceph-devel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
