If, after rounding off, the discard request is smaller than alloc_size,
drop it on the floor in __rbd_img_fill_request().
Default alloc_size to 64k. This should cover both HDD and SSD based
bluestore OSDs and somewhat improve things for filestore. For OSDs on
filestore with filestore_punch_hole = false, alloc_size is best set to
object size in order to allow deletes and truncates and disallow zero
op.
Signed-off-by: Ilya Dryomov <idryomov@xxxxxxxxx>
---
drivers/block/rbd.c | 56 +++++++++++++++++++++++++++++++++++++++++++++++------
1 file changed, 50 insertions(+), 6 deletions(-)
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 87f30bf49f1f..1f5517355af3 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -733,6 +733,7 @@ static struct rbd_client *rbd_client_find(struct ceph_options *ceph_opts)
*/
enum {
Opt_queue_depth,
+ Opt_alloc_size,
Opt_lock_timeout,
Opt_last_int,
/* int args above */
@@ -749,6 +750,7 @@ enum {
static match_table_t rbd_opts_tokens = {
{Opt_queue_depth, "queue_depth=%d"},
+ {Opt_alloc_size, "alloc_size=%d"},
{Opt_lock_timeout, "lock_timeout=%d"},
/* int args above */
{Opt_pool_ns, "_pool_ns=%s"},
@@ -765,6 +767,7 @@ static match_table_t rbd_opts_tokens = {
struct rbd_options {
int queue_depth;
+ int alloc_size;
unsigned long lock_timeout;
bool read_only;
bool lock_on_read;
@@ -773,6 +776,7 @@ struct rbd_options {
};
#define RBD_QUEUE_DEPTH_DEFAULT BLKDEV_MAX_RQ
+#define RBD_ALLOC_SIZE_DEFAULT (64 * 1024)
#define RBD_LOCK_TIMEOUT_DEFAULT 0 /* no timeout */
#define RBD_READ_ONLY_DEFAULT false
#define RBD_LOCK_ON_READ_DEFAULT false
@@ -812,6 +816,17 @@ static int parse_rbd_opts_token(char *c, void *private)
}
pctx->opts->queue_depth = intval;
break;
+ case Opt_alloc_size:
+ if (intval < 1) {
+ pr_err("alloc_size out of range\n");
+ return -EINVAL;
+ }
+ if (!is_power_of_2(intval)) {
+ pr_err("alloc_size must be a power of 2\n");
+ return -EINVAL;
+ }
+ pctx->opts->alloc_size = intval;
+ break;
case Opt_lock_timeout:
/* 0 is "wait forever" (i.e. infinite timeout) */
if (intval < 0 || intval > INT_MAX / 1000) {
@@ -1853,6 +1868,26 @@ static u16 truncate_or_zero_opcode(struct rbd_obj_request *obj_req)
static int rbd_obj_setup_discard(struct rbd_obj_request *obj_req)
{
+ struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev;
+ u64 off = obj_req->ex.oe_off;
+ u64 next_off = obj_req->ex.oe_off + obj_req->ex.oe_len;
+
+ /*
+ * Align the range to alloc_size boundary and punt on discards
+ * that are too small to free up any space.
+ *
+ * alloc_size == object_size && is_tail() is a special case for
+ * filestore with filestore_punch_hole = false, needed to allow
+ * truncate (in addition to delete).
+ */
+ if (rbd_dev->opts->alloc_size != rbd_dev->layout.object_size ||
+ !rbd_obj_is_tail(obj_req)) {
+ off = round_up(off, rbd_dev->opts->alloc_size);
+ next_off = round_down(next_off, rbd_dev->opts->alloc_size);
+ if (off >= next_off)
+ return 1;
+ }
+
obj_req->osd_req = rbd_osd_req_create(obj_req, 1);
if (!obj_req->osd_req)
return -ENOMEM;
@@ -1860,10 +1895,12 @@ static int rbd_obj_setup_discard(struct rbd_obj_request *obj_req)
if (rbd_obj_is_entire(obj_req)) {
osd_req_op_init(obj_req->osd_req, 0, CEPH_OSD_OP_DELETE, 0);
} else {
+ dout("%s %p %llu~%llu -> %llu~%llu\n", __func__,
+ obj_req, obj_req->ex.oe_off, obj_req->ex.oe_len,
+ off, next_off - off);
osd_req_op_extent_init(obj_req->osd_req, 0,
truncate_or_zero_opcode(obj_req),
- obj_req->ex.oe_off, obj_req->ex.oe_len,
- 0, 0);
+ off, next_off - off, 0, 0);
}
obj_req->write_state = RBD_OBJ_WRITE_FLAT;
@@ -1946,10 +1983,10 @@ static int rbd_obj_setup_zeroout(struct rbd_obj_request *obj_req)
*/
static int __rbd_img_fill_request(struct rbd_img_request *img_req)
{
- struct rbd_obj_request *obj_req;
+ struct rbd_obj_request *obj_req, *next_obj_req;
int ret;
- for_each_obj_request(img_req, obj_req) {
+ for_each_obj_request_safe(img_req, obj_req, next_obj_req) {
switch (img_req->op_type) {
case OBJ_OP_READ:
ret = rbd_obj_setup_read(obj_req);
@@ -1966,8 +2003,14 @@ static int __rbd_img_fill_request(struct rbd_img_request *img_req)
default:
rbd_assert(0);
}
- if (ret)
+ if (ret < 0)
return ret;
+ if (ret > 0) {
+ img_req->xferred += obj_req->ex.oe_len;
+ img_req->pending_count--;
+ rbd_img_obj_request_del(img_req, obj_req);
+ continue;
+ }
ret = ceph_osdc_alloc_messages(obj_req->osd_req, GFP_NOIO);
if (ret)
@@ -3757,7 +3800,7 @@ static void rbd_queue_workfn(struct work_struct *work)
else
result = rbd_img_fill_from_bio(img_request, offset, length,
rq->bio);
- if (result)
+ if (result || !img_request->pending_count)
goto err_img_request;
rbd_img_request_submit(img_request);
@@ -5418,6 +5461,7 @@ static int rbd_add_parse_args(const char *buf,
pctx.opts->read_only = RBD_READ_ONLY_DEFAULT;
pctx.opts->queue_depth = RBD_QUEUE_DEPTH_DEFAULT;
+ pctx.opts->alloc_size = RBD_ALLOC_SIZE_DEFAULT;
pctx.opts->lock_timeout = RBD_LOCK_TIMEOUT_DEFAULT;
pctx.opts->lock_on_read = RBD_LOCK_ON_READ_DEFAULT;
pctx.opts->exclusive = RBD_EXCLUSIVE_DEFAULT;
--
2.14.4
