diff options
author | Ilya Dryomov <idryomov@gmail.com> | 2018-01-29 14:04:08 +0100 |
---|---|---|
committer | Ilya Dryomov <idryomov@gmail.com> | 2018-04-02 10:12:40 +0200 |
commit | 51c3509e5e167cf0fdc82c81f4d85da46b1ee1ee (patch) | |
tree | 0e9e218474ae17bbb1635d2e5e7eeed579ca6f9a /drivers/block/rbd.c | |
parent | rbd: new request handling code (diff) | |
download | linux-51c3509e5e167cf0fdc82c81f4d85da46b1ee1ee.tar.xz linux-51c3509e5e167cf0fdc82c81f4d85da46b1ee1ee.zip |
rbd: remove old request handling code
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>
Diffstat (limited to 'drivers/block/rbd.c')
-rw-r--r-- | drivers/block/rbd.c | 734 |
1 files changed, 4 insertions, 730 deletions
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c index 1bffad122dc2..e7e99e7fd874 100644 --- a/drivers/block/rbd.c +++ b/drivers/block/rbd.c @@ -231,8 +231,6 @@ enum obj_operation_type { enum obj_req_flags { OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */ OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */ - OBJ_REQ_KNOWN, /* EXISTS flag valid: no = 0, yes = 1 */ - OBJ_REQ_EXISTS, /* target exists: no = 0, yes = 1 */ }; /* @@ -271,27 +269,15 @@ struct rbd_obj_request { * An object request associated with an image will have its * img_data flag set; a standalone object request will not. * - * A standalone object request will have which == BAD_WHICH - * and a null obj_request pointer. - * - * An object request initiated in support of a layered image - * object (to check for its existence before a write) will - * have which == BAD_WHICH and a non-null obj_request pointer. - * * Finally, an object request for rbd image data will have * which != BAD_WHICH, and will have a non-null img_request * pointer. The value of which will be in the range * 0..(img_request->obj_request_count-1). */ - union { - struct rbd_obj_request *obj_request; /* STAT op */ - struct { - struct rbd_img_request *img_request; - u64 img_offset; - /* links for img_request->obj_requests list */ - struct list_head links; - }; - }; + struct rbd_img_request *img_request; + u64 img_offset; + /* links for img_request->obj_requests list */ + struct list_head links; u32 which; /* posn image request list */ enum obj_request_type type; @@ -480,8 +466,6 @@ static bool single_major = true; module_param(single_major, bool, S_IRUGO); MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices (default: true)"); -static int rbd_img_request_submit(struct rbd_img_request *img_request); - static ssize_t rbd_add(struct bus_type *bus, const char *buf, size_t count); static ssize_t rbd_remove(struct bus_type *bus, const char *buf, @@ -610,9 +594,6 @@ void rbd_warn(struct rbd_device *rbd_dev, const char *fmt, ...) # define rbd_assert(expr) ((void) 0) #endif /* !RBD_DEBUG */ -static void rbd_osd_copyup_callback(struct rbd_obj_request *obj_request); -static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request); -static void rbd_img_parent_read(struct rbd_obj_request *obj_request); static void rbd_dev_remove_parent(struct rbd_device *rbd_dev); static int rbd_dev_refresh(struct rbd_device *rbd_dev); @@ -1369,37 +1350,6 @@ static bool obj_request_done_test(struct rbd_obj_request *obj_request) return test_bit(OBJ_REQ_DONE, &obj_request->flags) != 0; } -/* - * This sets the KNOWN flag after (possibly) setting the EXISTS - * flag. The latter is set based on the "exists" value provided. - * - * Note that for our purposes once an object exists it never goes - * away again. It's possible that the response from two existence - * checks are separated by the creation of the target object, and - * the first ("doesn't exist") response arrives *after* the second - * ("does exist"). In that case we ignore the second one. - */ -static void obj_request_existence_set(struct rbd_obj_request *obj_request, - bool exists) -{ - if (exists) - set_bit(OBJ_REQ_EXISTS, &obj_request->flags); - set_bit(OBJ_REQ_KNOWN, &obj_request->flags); - smp_mb(); -} - -static bool obj_request_known_test(struct rbd_obj_request *obj_request) -{ - smp_mb(); - return test_bit(OBJ_REQ_KNOWN, &obj_request->flags) != 0; -} - -static bool obj_request_exists_test(struct rbd_obj_request *obj_request) -{ - smp_mb(); - return test_bit(OBJ_REQ_EXISTS, &obj_request->flags) != 0; -} - static bool obj_request_overlaps_parent(struct rbd_obj_request *obj_request) { struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; @@ -1643,42 +1593,6 @@ static bool rbd_img_is_write(struct rbd_img_request *img_req) } } -static void -rbd_img_obj_request_read_callback(struct rbd_obj_request *obj_request) -{ - u64 xferred = obj_request->xferred; - u64 length = obj_request->length; - - dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, - obj_request, obj_request->img_request, obj_request->result, - xferred, length); - /* - * ENOENT means a hole in the image. We zero-fill the entire - * length of the request. A short read also implies zero-fill - * to the end of the request. An error requires the whole - * length of the request to be reported finished with an error - * to the block layer. In each case we update the xferred - * count to indicate the whole request was satisfied. - */ - rbd_assert(obj_request->type != OBJ_REQUEST_NODATA); - if (obj_request->result == -ENOENT) { - if (obj_request->type == OBJ_REQUEST_BIO) - zero_bios(&obj_request->bio_pos, 0, length); - else - zero_bvecs(&obj_request->bvec_pos, 0, length); - obj_request->result = 0; - } else if (xferred < length && !obj_request->result) { - if (obj_request->type == OBJ_REQUEST_BIO) - zero_bios(&obj_request->bio_pos, xferred, - length - xferred); - else - zero_bvecs(&obj_request->bvec_pos, xferred, - length - xferred); - } - obj_request->xferred = length; - obj_request_done_set(obj_request); -} - static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) { dout("%s: obj %p cb %p\n", __func__, obj_request, @@ -1686,93 +1600,6 @@ static void rbd_obj_request_complete(struct rbd_obj_request *obj_request) obj_request->callback(obj_request); } -static void rbd_obj_request_error(struct rbd_obj_request *obj_request, int err) -{ - obj_request->result = err; - obj_request->xferred = 0; - /* - * kludge - mirror rbd_obj_request_submit() to match a put in - * rbd_img_obj_callback() - */ - if (obj_request_img_data_test(obj_request)) { - WARN_ON(obj_request->callback != rbd_img_obj_callback); - rbd_img_request_get(obj_request->img_request); - } - obj_request_done_set(obj_request); - rbd_obj_request_complete(obj_request); -} - -static void rbd_osd_read_callback(struct rbd_obj_request *obj_request) -{ - struct rbd_img_request *img_request = NULL; - struct rbd_device *rbd_dev = NULL; - bool layered = false; - - if (obj_request_img_data_test(obj_request)) { - img_request = obj_request->img_request; - layered = img_request && img_request_layered_test(img_request); - rbd_dev = img_request->rbd_dev; - } - - dout("%s: obj %p img %p result %d %llu/%llu\n", __func__, - obj_request, img_request, obj_request->result, - obj_request->xferred, obj_request->length); - if (layered && obj_request->result == -ENOENT && - obj_request->img_offset < rbd_dev->parent_overlap) - rbd_img_parent_read(obj_request); - else if (img_request) - rbd_img_obj_request_read_callback(obj_request); - else - obj_request_done_set(obj_request); -} - -static void rbd_osd_write_callback(struct rbd_obj_request *obj_request) -{ - dout("%s: obj %p result %d %llu\n", __func__, obj_request, - obj_request->result, obj_request->length); - /* - * There is no such thing as a successful short write. Set - * it to our originally-requested length. - */ - obj_request->xferred = obj_request->length; - obj_request_done_set(obj_request); -} - -static void rbd_osd_discard_callback(struct rbd_obj_request *obj_request) -{ - dout("%s: obj %p result %d %llu\n", __func__, obj_request, - obj_request->result, obj_request->length); - /* - * There is no such thing as a successful short discard. Set - * it to our originally-requested length. - */ - obj_request->xferred = obj_request->length; - /* discarding a non-existent object is not a problem */ - if (obj_request->result == -ENOENT) - obj_request->result = 0; - obj_request_done_set(obj_request); -} - -/* - * For a simple stat call there's nothing to do. We'll do more if - * this is part of a write sequence for a layered image. - */ -static void rbd_osd_stat_callback(struct rbd_obj_request *obj_request) -{ - dout("%s: obj %p\n", __func__, obj_request); - obj_request_done_set(obj_request); -} - -static void rbd_osd_call_callback(struct rbd_obj_request *obj_request) -{ - dout("%s: obj %p\n", __func__, obj_request); - - if (obj_request_img_data_test(obj_request)) - rbd_osd_copyup_callback(obj_request); - else - obj_request_done_set(obj_request); -} - static void rbd_obj_handle_request(struct rbd_obj_request *obj_req); static void rbd_osd_req_callback(struct ceph_osd_request *osd_req) @@ -1871,32 +1698,6 @@ static struct ceph_osd_request *rbd_osd_req_create( CEPH_OSD_FLAG_WRITE : CEPH_OSD_FLAG_READ, obj_request); } -/* - * Create a copyup osd request based on the information in the object - * request supplied. A copyup request has two or three osd ops, a - * copyup method call, potentially a hint op, and a write or truncate - * or zero op. - */ -static struct ceph_osd_request * -rbd_osd_req_create_copyup(struct rbd_obj_request *obj_request) -{ - struct rbd_img_request *img_request; - int num_osd_ops = 3; - - rbd_assert(obj_request_img_data_test(obj_request)); - img_request = obj_request->img_request; - rbd_assert(img_request); - rbd_assert(img_request_write_test(img_request) || - img_request_discard_test(img_request)); - - if (img_request_discard_test(img_request)) - num_osd_ops = 2; - - return __rbd_osd_req_create(img_request->rbd_dev, - img_request->snapc, num_osd_ops, - CEPH_OSD_FLAG_WRITE, obj_request); -} - static void rbd_osd_req_destroy(struct ceph_osd_request *osd_req) { ceph_osdc_put_request(osd_req); @@ -2217,73 +2018,6 @@ out: rbd_img_request_complete(img_request); } -/* - * Add individual osd ops to the given ceph_osd_request and prepare - * them for submission. num_ops is the current number of - * osd operations already to the object request. - */ -static void rbd_img_obj_request_fill(struct rbd_obj_request *obj_request, - struct ceph_osd_request *osd_request, - enum obj_operation_type op_type, - unsigned int num_ops) -{ - struct rbd_img_request *img_request = obj_request->img_request; - struct rbd_device *rbd_dev = img_request->rbd_dev; - u64 object_size = rbd_obj_bytes(&rbd_dev->header); - u64 offset = obj_request->offset; - u64 length = obj_request->length; - u64 img_end; - u16 opcode; - - if (op_type == OBJ_OP_DISCARD) { - if (!offset && length == object_size && - (!img_request_layered_test(img_request) || - !obj_request_overlaps_parent(obj_request))) { - opcode = CEPH_OSD_OP_DELETE; - } else if ((offset + length == object_size)) { - opcode = CEPH_OSD_OP_TRUNCATE; - } else { - down_read(&rbd_dev->header_rwsem); - img_end = rbd_dev->header.image_size; - up_read(&rbd_dev->header_rwsem); - - if (obj_request->img_offset + length == img_end) - opcode = CEPH_OSD_OP_TRUNCATE; - else - opcode = CEPH_OSD_OP_ZERO; - } - } else if (op_type == OBJ_OP_WRITE) { - if (!offset && length == object_size) - opcode = CEPH_OSD_OP_WRITEFULL; - else - opcode = CEPH_OSD_OP_WRITE; - osd_req_op_alloc_hint_init(osd_request, num_ops, - object_size, object_size); - num_ops++; - } else { - opcode = CEPH_OSD_OP_READ; - } - - if (opcode == CEPH_OSD_OP_DELETE) - osd_req_op_init(osd_request, num_ops, opcode, 0); - else - osd_req_op_extent_init(osd_request, num_ops, opcode, - offset, length, 0, 0); - - if (obj_request->type == OBJ_REQUEST_BIO) - osd_req_op_extent_osd_data_bio(osd_request, num_ops, - &obj_request->bio_pos, length); - else if (obj_request->type == OBJ_REQUEST_BVECS) - osd_req_op_extent_osd_data_bvec_pos(osd_request, num_ops, - &obj_request->bvec_pos); - - /* Discards are also writes */ - if (op_type == OBJ_OP_WRITE || op_type == OBJ_OP_DISCARD) - rbd_osd_req_format_write(obj_request); - else - rbd_osd_req_format_read(obj_request); -} - static void rbd_osd_req_setup_data(struct rbd_obj_request *obj_req, u32 which) { switch (obj_req->type) { @@ -2568,366 +2302,6 @@ out_unwind: return -ENOMEM; } -static void -rbd_osd_copyup_callback(struct rbd_obj_request *obj_request) -{ - struct rbd_img_request *img_request; - struct rbd_device *rbd_dev; - - dout("%s: obj %p\n", __func__, obj_request); - - rbd_assert(obj_request->type == OBJ_REQUEST_BIO || - obj_request->type == OBJ_REQUEST_NODATA); - rbd_assert(obj_request_img_data_test(obj_request)); - img_request = obj_request->img_request; - rbd_assert(img_request); - - rbd_dev = img_request->rbd_dev; - rbd_assert(rbd_dev); - - /* - * We want the transfer count to reflect the size of the - * original write request. There is no such thing as a - * successful short write, so if the request was successful - * we can just set it to the originally-requested length. - */ - if (!obj_request->result) - obj_request->xferred = obj_request->length; - - obj_request_done_set(obj_request); -} - -static void -rbd_img_obj_parent_read_full_callback(struct rbd_img_request *img_request) -{ - struct rbd_obj_request *orig_request; - struct ceph_osd_request *osd_req; - struct rbd_device *rbd_dev; - enum obj_operation_type op_type; - int img_result; - u64 parent_length; - - rbd_assert(img_request_child_test(img_request)); - - /* First get what we need from the image request */ - - orig_request = img_request->obj_request; - rbd_assert(orig_request != NULL); - rbd_assert(obj_request_type_valid(orig_request->type)); - img_result = img_request->result; - parent_length = img_request->length; - rbd_assert(img_result || parent_length == img_request->xferred); - rbd_img_request_put(img_request); - - rbd_assert(orig_request->img_request); - rbd_dev = orig_request->img_request->rbd_dev; - rbd_assert(rbd_dev); - - /* - * If the overlap has become 0 (most likely because the - * image has been flattened) we need to free the pages - * and re-submit the original write request. - */ - if (!rbd_dev->parent_overlap) { - rbd_obj_request_submit(orig_request); - return; - } - - if (img_result) - goto out_err; - - /* - * The original osd request is of no use to use any more. - * We need a new one that can hold the three ops in a copyup - * request. Allocate the new copyup osd request for the - * original request, and release the old one. - */ - img_result = -ENOMEM; - osd_req = rbd_osd_req_create_copyup(orig_request); - if (!osd_req) - goto out_err; - rbd_osd_req_destroy(orig_request->osd_req); - orig_request->osd_req = osd_req; - - /* Initialize the copyup op */ - - osd_req_op_cls_init(osd_req, 0, CEPH_OSD_OP_CALL, "rbd", "copyup"); - osd_req_op_cls_request_data_bvecs(osd_req, 0, orig_request->copyup_bvecs, - parent_length); - - /* Add the other op(s) */ - - op_type = rbd_img_request_op_type(orig_request->img_request); - rbd_img_obj_request_fill(orig_request, osd_req, op_type, 1); - - /* All set, send it off. */ - - rbd_obj_request_submit(orig_request); - return; - -out_err: - rbd_obj_request_error(orig_request, img_result); -} - -static int setup_copyup_bvecs(struct rbd_obj_request *obj_req, u64 obj_overlap); - -/* - * Read from the parent image the range of data that covers the - * entire target of the given object request. This is used for - * satisfying a layered image write request when the target of an - * object request from the image request does not exist. - * - * A page array big enough to hold the returned data is allocated - * and supplied to rbd_img_request_fill() as the "data descriptor." - * When the read completes, this page array will be transferred to - * the original object request for the copyup operation. - * - * If an error occurs, it is recorded as the result of the original - * object request in rbd_img_obj_exists_callback(). - */ -static int rbd_img_obj_parent_read_full(struct rbd_obj_request *obj_request) -{ - struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; - struct rbd_img_request *parent_request = NULL; - struct ceph_bvec_iter bvec_it = { 0 }; - u64 img_offset; - u64 length; - int result; - - rbd_assert(rbd_dev->parent != NULL); - - /* - * Determine the byte range covered by the object in the - * child image to which the original request was to be sent. - */ - img_offset = obj_request->img_offset - obj_request->offset; - length = rbd_obj_bytes(&rbd_dev->header); - - /* - * There is no defined parent data beyond the parent - * overlap, so limit what we read at that boundary if - * necessary. - */ - if (img_offset + length > rbd_dev->parent_overlap) { - rbd_assert(img_offset < rbd_dev->parent_overlap); - length = rbd_dev->parent_overlap - img_offset; - } - - /* - * Allocate a page array big enough to receive the data read - * from the parent. - */ - result = setup_copyup_bvecs(obj_request, length); - if (result) - goto out_err; - - result = -ENOMEM; - parent_request = rbd_parent_request_create(obj_request, - img_offset, length); - if (!parent_request) - goto out_err; - - bvec_it.bvecs = obj_request->copyup_bvecs; - bvec_it.iter.bi_size = length; - result = rbd_img_request_fill(parent_request, OBJ_REQUEST_BVECS, - &bvec_it); - if (result) - goto out_err; - - parent_request->callback = rbd_img_obj_parent_read_full_callback; - - result = rbd_img_request_submit(parent_request); - if (!result) - return 0; - -out_err: - if (parent_request) - rbd_img_request_put(parent_request); - return result; -} - -static void rbd_img_obj_exists_callback(struct rbd_obj_request *obj_request) -{ - struct rbd_obj_request *orig_request; - struct rbd_device *rbd_dev; - int result; - - rbd_assert(!obj_request_img_data_test(obj_request)); - - /* - * All we need from the object request is the original - * request and the result of the STAT op. Grab those, then - * we're done with the request. - */ - orig_request = obj_request->obj_request; - obj_request->obj_request = NULL; - rbd_obj_request_put(orig_request); - rbd_assert(orig_request); - rbd_assert(orig_request->img_request); - - result = obj_request->result; - obj_request->result = 0; - - dout("%s: obj %p for obj %p result %d %llu/%llu\n", __func__, - obj_request, orig_request, result, - obj_request->xferred, obj_request->length); - rbd_obj_request_put(obj_request); - - /* - * If the overlap has become 0 (most likely because the - * image has been flattened) we need to re-submit the - * original request. - */ - rbd_dev = orig_request->img_request->rbd_dev; - if (!rbd_dev->parent_overlap) { - rbd_obj_request_submit(orig_request); - return; - } - - /* - * Our only purpose here is to determine whether the object - * exists, and we don't want to treat the non-existence as - * an error. If something else comes back, transfer the - * error to the original request and complete it now. - */ - if (!result) { - obj_request_existence_set(orig_request, true); - } else if (result == -ENOENT) { - obj_request_existence_set(orig_request, false); - } else { - goto fail_orig_request; - } - - /* - * Resubmit the original request now that we have recorded - * whether the target object exists. - */ - result = rbd_img_obj_request_submit(orig_request); - if (result) - goto fail_orig_request; - - return; - -fail_orig_request: - rbd_obj_request_error(orig_request, result); -} - -static int rbd_img_obj_exists_submit(struct rbd_obj_request *obj_request) -{ - struct rbd_device *rbd_dev = obj_request->img_request->rbd_dev; - struct rbd_obj_request *stat_request; - struct page **pages; - int ret; - - stat_request = rbd_obj_request_create(OBJ_REQUEST_NODATA); - if (!stat_request) - return -ENOMEM; - - stat_request->object_no = obj_request->object_no; - - stat_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1, - stat_request); - if (!stat_request->osd_req) { - ret = -ENOMEM; - goto fail_stat_request; - } - - /* - * The response data for a STAT call consists of: - * le64 length; - * struct { - * le32 tv_sec; - * le32 tv_nsec; - * } mtime; - */ - pages = ceph_alloc_page_vector(1, GFP_NOIO); - if (IS_ERR(pages)) { - ret = PTR_ERR(pages); - goto fail_stat_request; - } - - osd_req_op_init(stat_request->osd_req, 0, CEPH_OSD_OP_STAT, 0); - osd_req_op_raw_data_in_pages(stat_request->osd_req, 0, pages, - 8 + sizeof(struct ceph_timespec), - 0, false, true); - - rbd_obj_request_get(obj_request); - stat_request->obj_request = obj_request; - stat_request->callback = rbd_img_obj_exists_callback; - - rbd_obj_request_submit(stat_request); - return 0; - -fail_stat_request: - rbd_obj_request_put(stat_request); - return ret; -} - -static bool img_obj_request_simple(struct rbd_obj_request *obj_request) -{ - struct rbd_img_request *img_request = obj_request->img_request; - struct rbd_device *rbd_dev = img_request->rbd_dev; - - /* Reads */ - if (!img_request_write_test(img_request) && - !img_request_discard_test(img_request)) - return true; - - /* Non-layered writes */ - if (!img_request_layered_test(img_request)) - return true; - - /* - * Layered writes outside of the parent overlap range don't - * share any data with the parent. - */ - if (!obj_request_overlaps_parent(obj_request)) - return true; - - /* - * Entire-object layered writes - we will overwrite whatever - * parent data there is anyway. - */ - if (!obj_request->offset && - obj_request->length == rbd_obj_bytes(&rbd_dev->header)) - return true; - - /* - * If the object is known to already exist, its parent data has - * already been copied. - */ - if (obj_request_known_test(obj_request) && - obj_request_exists_test(obj_request)) - return true; - - return false; -} - -static int rbd_img_obj_request_submit(struct rbd_obj_request *obj_request) -{ - rbd_assert(obj_request_img_data_test(obj_request)); - rbd_assert(obj_request_type_valid(obj_request->type)); - rbd_assert(obj_request->img_request); - - if (img_obj_request_simple(obj_request)) { - rbd_obj_request_submit(obj_request); - return 0; - } - - /* - * It's a layered write. The target object might exist but - * we may not know that yet. If we know it doesn't exist, - * start by reading the data for the full target object from - * the parent so we can use it for a copyup to the target. - */ - if (obj_request_known_test(obj_request)) - return rbd_img_obj_parent_read_full(obj_request); - - /* We don't know whether the target exists. Go find out. */ - - return rbd_img_obj_exists_submit(obj_request); -} - static int rbd_img_request_submit(struct rbd_img_request *img_request) { struct rbd_obj_request *obj_request; @@ -3131,106 +2505,6 @@ static int setup_copyup_bvecs(struct rbd_obj_request *obj_req, u64 obj_overlap) return 0; } -static void rbd_img_parent_read_callback(struct rbd_img_request *img_request) -{ - struct rbd_obj_request *obj_request; - struct rbd_device *rbd_dev; - u64 obj_end; - u64 img_xferred; - int img_result; - - rbd_assert(img_request_child_test(img_request)); - - /* First get what we need from the image request and release it */ - - obj_request = img_request->obj_request; - img_xferred = img_request->xferred; - img_result = img_request->result; - rbd_img_request_put(img_request); - - /* - * If the overlap has become 0 (most likely because the - * image has been flattened) we need to re-submit the - * original request. - */ - rbd_assert(obj_request); - rbd_assert(obj_request->img_request); - rbd_dev = obj_request->img_request->rbd_dev; - if (!rbd_dev->parent_overlap) { - rbd_obj_request_submit(obj_request); - return; - } - - obj_request->result = img_result; - if (obj_request->result) - goto out; - - /* - * We need to zero anything beyond the parent overlap - * boundary. Since rbd_img_obj_request_read_callback() - * will zero anything beyond the end of a short read, an - * easy way to do this is to pretend the data from the - * parent came up short--ending at the overlap boundary. - */ - rbd_assert(obj_request->img_offset < U64_MAX - obj_request->length); - obj_end = obj_request->img_offset + obj_request->length; - if (obj_end > rbd_dev->parent_overlap) { - u64 xferred = 0; - - if (obj_request->img_offset < rbd_dev->parent_overlap) - xferred = rbd_dev->parent_overlap - - obj_request->img_offset; - - obj_request->xferred = min(img_xferred, xferred); - } else { - obj_request->xferred = img_xferred; - } -out: - rbd_img_obj_request_read_callback(obj_request); - rbd_obj_request_complete(obj_request); -} - -static void rbd_img_parent_read(struct rbd_obj_request *obj_request) -{ - struct rbd_img_request *img_request; - int result; - - rbd_assert(obj_request_img_data_test(obj_request)); - rbd_assert(obj_request->img_request != NULL); - rbd_assert(obj_request->result == (s32) -ENOENT); - rbd_assert(obj_request_type_valid(obj_request->type)); - - /* rbd_read_finish(obj_request, obj_request->length); */ - img_request = rbd_parent_request_create(obj_request, - obj_request->img_offset, - obj_request->length); - result = -ENOMEM; - if (!img_request) - goto out_err; - - if (obj_request->type == OBJ_REQUEST_BIO) - result = rbd_img_request_fill(img_request, OBJ_REQUEST_BIO, - &obj_request->bio_pos); - else - result = rbd_img_request_fill(img_request, OBJ_REQUEST_BVECS, - &obj_request->bvec_pos); - if (result) - goto out_err; - - img_request->callback = rbd_img_parent_read_callback; - result = rbd_img_request_submit(img_request); - if (result) - goto out_err; - - return; -out_err: - if (img_request) - rbd_img_request_put(img_request); - obj_request->result = result; - obj_request->xferred = 0; - obj_request_done_set(obj_request); -} - static int rbd_obj_handle_write_guard(struct rbd_obj_request *obj_req) { struct rbd_device *rbd_dev = obj_req->img_request->rbd_dev; |