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libceph: define struct ceph_sparse_extent and add some helpers

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When the OSD sends back a sparse read reply, it contains an array of
these structures. Define the structure and add a couple of helpers for
dealing with them.

Also add a place in struct ceph_osd_req_op to store the extent buffer,
and code to free it if it's populated when the req is torn down.

Signed-off-by: Jeff Layton <jlayton@kernel.org>
Reviewed-by: Xiubo Li <xiubli@redhat.com>
Reviewed-and-tested-by: Luís Henriques <lhenriques@suse.de>
Reviewed-by: Milind Changire <mchangir@redhat.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
This commit is contained in:
Jeff Layton
2022-03-16 15:23:00 -04:00
committed by Ilya Dryomov
parent 08b8a0440e
commit a679e50f72
2 changed files with 55 additions and 1 deletions
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43
include/linux/ceph/osd_client.h
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@@ -29,6 +29,17 @@ typedef void (*ceph_osdc_callback_t)(struct ceph_osd_request *);
#define CEPH_HOMELESS_OSD -1
/*
* A single extent in a SPARSE_READ reply.
*
* Note that these come from the OSD as little-endian values. On BE arches,
* we convert them in-place after receipt.
*/
struct ceph_sparse_extent {
u64 off;
u64 len;
} __packed;
/*
* A given osd we're communicating with.
*
@@ -104,6 +115,8 @@ struct ceph_osd_req_op {
u64 offset, length;
u64 truncate_size;
u32 truncate_seq;
int sparse_ext_cnt;
struct ceph_sparse_extent *sparse_ext;
struct ceph_osd_data osd_data;
} extent;
struct {
@@ -510,6 +523,20 @@ extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
u32 truncate_seq, u64 truncate_size,
bool use_mempool);
int __ceph_alloc_sparse_ext_map(struct ceph_osd_req_op *op, int cnt);
/*
* How big an extent array should we preallocate for a sparse read? This is
* just a starting value. If we get more than this back from the OSD, the
* receiver will reallocate.
*/
#define CEPH_SPARSE_EXT_ARRAY_INITIAL 16
static inline int ceph_alloc_sparse_ext_map(struct ceph_osd_req_op *op)
{
return __ceph_alloc_sparse_ext_map(op, CEPH_SPARSE_EXT_ARRAY_INITIAL);
}
extern void ceph_osdc_get_request(struct ceph_osd_request *req);
extern void ceph_osdc_put_request(struct ceph_osd_request *req);
@@ -564,5 +591,19 @@ int ceph_osdc_list_watchers(struct ceph_osd_client *osdc,
struct ceph_object_locator *oloc,
struct ceph_watch_item **watchers,
u32 *num_watchers);
#endif
/* Find offset into the buffer of the end of the extent map */
static inline u64 ceph_sparse_ext_map_end(struct ceph_osd_req_op *op)
{
struct ceph_sparse_extent *ext;
/* No extents? No data */
if (op->extent.sparse_ext_cnt == 0)
return 0;
ext = &op->extent.sparse_ext[op->extent.sparse_ext_cnt - 1];
return ext->off + ext->len - op->extent.offset;
}
#endif