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rbd: support for object-map and fast-diff

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Speed up reads, discards and zeroouts through RBD_OBJ_FLAG_MAY_EXIST
and RBD_OBJ_FLAG_NOOP_FOR_NONEXISTENT based on object map.

Invalid object maps are not trusted, but still updated.  Note that we
never iterate, resize or invalidate object maps.  If object-map feature
is enabled but object map fails to load, we just fail the requester
(either "rbd map" or I/O, by way of post-acquire action).

Signed-off-by: Ilya Dryomov <[email protected]>
This commit is contained in:
Ilya Dryomov 2019-06-05 19:25:11 +02:00
commit 22e8bd51bb
6 changed files with 794 additions and 3 deletions
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45
net/ceph/cls_lock_client.c
View file

@ -6,6 +6,7 @@
#include <linux/ceph/cls_lock_client.h>
#include <linux/ceph/decode.h>
#include <linux/ceph/libceph.h>
/**
* ceph_cls_lock - grab rados lock for object
@ -378,3 +379,47 @@ int ceph_cls_lock_info(struct ceph_osd_client *osdc,
return ret;
}
EXPORT_SYMBOL(ceph_cls_lock_info);
int ceph_cls_assert_locked(struct ceph_osd_request *req, int which,
char *lock_name, u8 type, char *cookie, char *tag)
{
int assert_op_buf_size;
int name_len = strlen(lock_name);
int cookie_len = strlen(cookie);
int tag_len = strlen(tag);
struct page **pages;
void *p, *end;
int ret;
assert_op_buf_size = name_len + sizeof(__le32) +
cookie_len + sizeof(__le32) +
tag_len + sizeof(__le32) +
sizeof(u8) + CEPH_ENCODING_START_BLK_LEN;
if (assert_op_buf_size > PAGE_SIZE)
return -E2BIG;
ret = osd_req_op_cls_init(req, which, "lock", "assert_locked");
if (ret)
return ret;
pages = ceph_alloc_page_vector(1, GFP_NOIO);
if (IS_ERR(pages))
return PTR_ERR(pages);
p = page_address(pages[0]);
end = p + assert_op_buf_size;
/* encode cls_lock_assert_op struct */
ceph_start_encoding(&p, 1, 1,
assert_op_buf_size - CEPH_ENCODING_START_BLK_LEN);
ceph_encode_string(&p, end, lock_name, name_len);
ceph_encode_8(&p, type);
ceph_encode_string(&p, end, cookie, cookie_len);
ceph_encode_string(&p, end, tag, tag_len);
WARN_ON(p != end);
osd_req_op_cls_request_data_pages(req, which, pages, assert_op_buf_size,
0, false, true);
return 0;
}
EXPORT_SYMBOL(ceph_cls_assert_locked);

17
net/ceph/striper.c
View file

@ -259,3 +259,20 @@ int ceph_extent_to_file(struct ceph_file_layout *l,
return 0;
}
EXPORT_SYMBOL(ceph_extent_to_file);
u64 ceph_get_num_objects(struct ceph_file_layout *l, u64 size)
{
u64 period = (u64)l->stripe_count * l->object_size;
u64 num_periods = DIV64_U64_ROUND_UP(size, period);
u64 remainder_bytes;
u64 remainder_objs = 0;
div64_u64_rem(size, period, &remainder_bytes);
if (remainder_bytes > 0 &&
remainder_bytes < (u64)l->stripe_count * l->stripe_unit)
remainder_objs = l->stripe_count -
DIV_ROUND_UP_ULL(remainder_bytes, l->stripe_unit);
return num_periods * l->stripe_count - remainder_objs;
}
EXPORT_SYMBOL(ceph_get_num_objects);