326 lines
8.8 KiB
C
326 lines
8.8 KiB
C
#include <linux/ceph/ceph_debug.h>
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#include <linux/types.h>
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#include <linux/slab.h>
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#include <linux/ceph/cls_lock_client.h>
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#include <linux/ceph/decode.h>
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/**
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* ceph_cls_lock - grab rados lock for object
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* @oid, @oloc: object to lock
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* @lock_name: the name of the lock
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* @type: lock type (CEPH_CLS_LOCK_EXCLUSIVE or CEPH_CLS_LOCK_SHARED)
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* @cookie: user-defined identifier for this instance of the lock
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* @tag: user-defined tag
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* @desc: user-defined lock description
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* @flags: lock flags
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*
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* All operations on the same lock should use the same tag.
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*/
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int ceph_cls_lock(struct ceph_osd_client *osdc,
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struct ceph_object_id *oid,
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struct ceph_object_locator *oloc,
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char *lock_name, u8 type, char *cookie,
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char *tag, char *desc, u8 flags)
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{
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int lock_op_buf_size;
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int name_len = strlen(lock_name);
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int cookie_len = strlen(cookie);
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int tag_len = strlen(tag);
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int desc_len = strlen(desc);
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void *p, *end;
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struct page *lock_op_page;
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struct timespec mtime;
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int ret;
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lock_op_buf_size = name_len + sizeof(__le32) +
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cookie_len + sizeof(__le32) +
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tag_len + sizeof(__le32) +
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desc_len + sizeof(__le32) +
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sizeof(struct ceph_timespec) +
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/* flag and type */
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sizeof(u8) + sizeof(u8) +
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CEPH_ENCODING_START_BLK_LEN;
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if (lock_op_buf_size > PAGE_SIZE)
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return -E2BIG;
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lock_op_page = alloc_page(GFP_NOIO);
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if (!lock_op_page)
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return -ENOMEM;
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p = page_address(lock_op_page);
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end = p + lock_op_buf_size;
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/* encode cls_lock_lock_op struct */
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ceph_start_encoding(&p, 1, 1,
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lock_op_buf_size - CEPH_ENCODING_START_BLK_LEN);
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ceph_encode_string(&p, end, lock_name, name_len);
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ceph_encode_8(&p, type);
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ceph_encode_string(&p, end, cookie, cookie_len);
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ceph_encode_string(&p, end, tag, tag_len);
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ceph_encode_string(&p, end, desc, desc_len);
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/* only support infinite duration */
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memset(&mtime, 0, sizeof(mtime));
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ceph_encode_timespec(p, &mtime);
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p += sizeof(struct ceph_timespec);
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ceph_encode_8(&p, flags);
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dout("%s lock_name %s type %d cookie %s tag %s desc %s flags 0x%x\n",
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__func__, lock_name, type, cookie, tag, desc, flags);
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ret = ceph_osdc_call(osdc, oid, oloc, "lock", "lock",
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CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
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lock_op_page, lock_op_buf_size, NULL, NULL);
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dout("%s: status %d\n", __func__, ret);
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__free_page(lock_op_page);
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return ret;
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}
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EXPORT_SYMBOL(ceph_cls_lock);
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/**
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* ceph_cls_unlock - release rados lock for object
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* @oid, @oloc: object to lock
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* @lock_name: the name of the lock
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* @cookie: user-defined identifier for this instance of the lock
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*/
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int ceph_cls_unlock(struct ceph_osd_client *osdc,
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struct ceph_object_id *oid,
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struct ceph_object_locator *oloc,
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char *lock_name, char *cookie)
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{
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int unlock_op_buf_size;
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int name_len = strlen(lock_name);
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int cookie_len = strlen(cookie);
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void *p, *end;
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struct page *unlock_op_page;
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int ret;
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unlock_op_buf_size = name_len + sizeof(__le32) +
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cookie_len + sizeof(__le32) +
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CEPH_ENCODING_START_BLK_LEN;
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if (unlock_op_buf_size > PAGE_SIZE)
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return -E2BIG;
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unlock_op_page = alloc_page(GFP_NOIO);
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if (!unlock_op_page)
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return -ENOMEM;
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p = page_address(unlock_op_page);
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end = p + unlock_op_buf_size;
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/* encode cls_lock_unlock_op struct */
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ceph_start_encoding(&p, 1, 1,
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unlock_op_buf_size - CEPH_ENCODING_START_BLK_LEN);
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ceph_encode_string(&p, end, lock_name, name_len);
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ceph_encode_string(&p, end, cookie, cookie_len);
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dout("%s lock_name %s cookie %s\n", __func__, lock_name, cookie);
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ret = ceph_osdc_call(osdc, oid, oloc, "lock", "unlock",
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CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
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unlock_op_page, unlock_op_buf_size, NULL, NULL);
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dout("%s: status %d\n", __func__, ret);
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__free_page(unlock_op_page);
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return ret;
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}
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EXPORT_SYMBOL(ceph_cls_unlock);
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/**
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* ceph_cls_break_lock - release rados lock for object for specified client
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* @oid, @oloc: object to lock
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* @lock_name: the name of the lock
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* @cookie: user-defined identifier for this instance of the lock
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* @locker: current lock owner
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*/
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int ceph_cls_break_lock(struct ceph_osd_client *osdc,
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struct ceph_object_id *oid,
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struct ceph_object_locator *oloc,
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char *lock_name, char *cookie,
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struct ceph_entity_name *locker)
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{
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int break_op_buf_size;
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int name_len = strlen(lock_name);
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int cookie_len = strlen(cookie);
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struct page *break_op_page;
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void *p, *end;
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int ret;
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break_op_buf_size = name_len + sizeof(__le32) +
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cookie_len + sizeof(__le32) +
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sizeof(u8) + sizeof(__le64) +
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CEPH_ENCODING_START_BLK_LEN;
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if (break_op_buf_size > PAGE_SIZE)
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return -E2BIG;
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break_op_page = alloc_page(GFP_NOIO);
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if (!break_op_page)
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return -ENOMEM;
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p = page_address(break_op_page);
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end = p + break_op_buf_size;
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/* encode cls_lock_break_op struct */
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ceph_start_encoding(&p, 1, 1,
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break_op_buf_size - CEPH_ENCODING_START_BLK_LEN);
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ceph_encode_string(&p, end, lock_name, name_len);
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ceph_encode_copy(&p, locker, sizeof(*locker));
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ceph_encode_string(&p, end, cookie, cookie_len);
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dout("%s lock_name %s cookie %s locker %s%llu\n", __func__, lock_name,
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cookie, ENTITY_NAME(*locker));
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ret = ceph_osdc_call(osdc, oid, oloc, "lock", "break_lock",
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CEPH_OSD_FLAG_WRITE | CEPH_OSD_FLAG_ONDISK,
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break_op_page, break_op_buf_size, NULL, NULL);
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dout("%s: status %d\n", __func__, ret);
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__free_page(break_op_page);
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return ret;
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}
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EXPORT_SYMBOL(ceph_cls_break_lock);
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void ceph_free_lockers(struct ceph_locker *lockers, u32 num_lockers)
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{
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int i;
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for (i = 0; i < num_lockers; i++)
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kfree(lockers[i].id.cookie);
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kfree(lockers);
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}
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EXPORT_SYMBOL(ceph_free_lockers);
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static int decode_locker(void **p, void *end, struct ceph_locker *locker)
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{
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u8 struct_v;
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u32 len;
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char *s;
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int ret;
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ret = ceph_start_decoding(p, end, 1, "locker_id_t", &struct_v, &len);
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if (ret)
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return ret;
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ceph_decode_copy(p, &locker->id.name, sizeof(locker->id.name));
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s = ceph_extract_encoded_string(p, end, NULL, GFP_NOIO);
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if (IS_ERR(s))
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return PTR_ERR(s);
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locker->id.cookie = s;
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ret = ceph_start_decoding(p, end, 1, "locker_info_t", &struct_v, &len);
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if (ret)
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return ret;
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*p += sizeof(struct ceph_timespec); /* skip expiration */
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ceph_decode_copy(p, &locker->info.addr, sizeof(locker->info.addr));
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ceph_decode_addr(&locker->info.addr);
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len = ceph_decode_32(p);
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*p += len; /* skip description */
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dout("%s %s%llu cookie %s addr %s\n", __func__,
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ENTITY_NAME(locker->id.name), locker->id.cookie,
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ceph_pr_addr(&locker->info.addr.in_addr));
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return 0;
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}
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static int decode_lockers(void **p, void *end, u8 *type, char **tag,
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struct ceph_locker **lockers, u32 *num_lockers)
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{
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u8 struct_v;
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u32 struct_len;
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char *s;
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int i;
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int ret;
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ret = ceph_start_decoding(p, end, 1, "cls_lock_get_info_reply",
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&struct_v, &struct_len);
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if (ret)
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return ret;
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*num_lockers = ceph_decode_32(p);
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*lockers = kcalloc(*num_lockers, sizeof(**lockers), GFP_NOIO);
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if (!*lockers)
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return -ENOMEM;
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for (i = 0; i < *num_lockers; i++) {
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ret = decode_locker(p, end, *lockers + i);
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if (ret)
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goto err_free_lockers;
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}
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*type = ceph_decode_8(p);
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s = ceph_extract_encoded_string(p, end, NULL, GFP_NOIO);
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if (IS_ERR(s)) {
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ret = PTR_ERR(s);
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goto err_free_lockers;
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}
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*tag = s;
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return 0;
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err_free_lockers:
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ceph_free_lockers(*lockers, *num_lockers);
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return ret;
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}
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/*
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* On success, the caller is responsible for:
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*
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* kfree(tag);
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* ceph_free_lockers(lockers, num_lockers);
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*/
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int ceph_cls_lock_info(struct ceph_osd_client *osdc,
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struct ceph_object_id *oid,
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struct ceph_object_locator *oloc,
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char *lock_name, u8 *type, char **tag,
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struct ceph_locker **lockers, u32 *num_lockers)
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{
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int get_info_op_buf_size;
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int name_len = strlen(lock_name);
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struct page *get_info_op_page, *reply_page;
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size_t reply_len;
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void *p, *end;
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int ret;
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get_info_op_buf_size = name_len + sizeof(__le32) +
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CEPH_ENCODING_START_BLK_LEN;
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if (get_info_op_buf_size > PAGE_SIZE)
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return -E2BIG;
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get_info_op_page = alloc_page(GFP_NOIO);
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if (!get_info_op_page)
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return -ENOMEM;
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reply_page = alloc_page(GFP_NOIO);
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if (!reply_page) {
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__free_page(get_info_op_page);
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return -ENOMEM;
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}
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p = page_address(get_info_op_page);
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end = p + get_info_op_buf_size;
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/* encode cls_lock_get_info_op struct */
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ceph_start_encoding(&p, 1, 1,
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get_info_op_buf_size - CEPH_ENCODING_START_BLK_LEN);
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ceph_encode_string(&p, end, lock_name, name_len);
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dout("%s lock_name %s\n", __func__, lock_name);
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ret = ceph_osdc_call(osdc, oid, oloc, "lock", "get_info",
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CEPH_OSD_FLAG_READ, get_info_op_page,
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get_info_op_buf_size, reply_page, &reply_len);
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dout("%s: status %d\n", __func__, ret);
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if (ret >= 0) {
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p = page_address(reply_page);
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end = p + reply_len;
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ret = decode_lockers(&p, end, type, tag, lockers, num_lockers);
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}
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__free_page(get_info_op_page);
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__free_page(reply_page);
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return ret;
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}
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EXPORT_SYMBOL(ceph_cls_lock_info);
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