From 75d1c941e57d4247de4c0ed4064a65cf1a4d3ed8 Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Wed, 13 Mar 2013 20:50:00 -0500 Subject: [PATCH] libceph: pass offset and length out of calc_layout() The purpose of calc_layout() is to determine, given a file offset and length and a layout describing the placement of file data across objects, where in "object space" that data resides. Specifically, it determines which object should hold the first part of the specified range of file data, and the offset and length of data within that object. The length will not exceed the bounds of the object, and the caller is informed of that maximum length. Add two parameters to calc_layout() to allow the object-relative offset and length to be passed back to the caller. This is the first steps toward having ceph_osdc_new_request() build its osd op structure using osd_req_op_extent_init(). Signed-off-by: Alex Elder Reviewed-by: Josh Durgin --- net/ceph/osd_client.c | 32 +++++++++++++++++--------------- 1 file changed, 17 insertions(+), 15 deletions(-) diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c index 02ed72820479..f782aca54daa 100644 --- a/net/ceph/osd_client.c +++ b/net/ceph/osd_client.c @@ -64,32 +64,31 @@ static int op_has_extent(int op) * fill osd op in request message. */ static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen, - struct ceph_osd_req_op *op, u64 *bno) + struct ceph_osd_req_op *op, u64 *objnum, + u64 *objoff, u64 *objlen) { u64 orig_len = *plen; - u64 objoff = 0; - u64 objlen = 0; int r; /* object extent? */ - r = ceph_calc_file_object_mapping(layout, off, orig_len, bno, - &objoff, &objlen); + r = ceph_calc_file_object_mapping(layout, off, orig_len, objnum, + objoff, objlen); if (r < 0) return r; - if (objlen < orig_len) { - *plen = objlen; + if (*objlen < orig_len) { + *plen = *objlen; dout(" skipping last %llu, final file extent %llu~%llu\n", orig_len - *plen, off, *plen); } if (op_has_extent(op->op)) { u32 osize = le32_to_cpu(layout->fl_object_size); - op->extent.offset = objoff; - op->extent.length = objlen; - if (op->extent.truncate_size <= off - objoff) { + op->extent.offset = *objoff; + op->extent.length = *objlen; + if (op->extent.truncate_size <= off - *objoff) { op->extent.truncate_size = 0; } else { - op->extent.truncate_size -= off - objoff; + op->extent.truncate_size -= off - *objoff; if (op->extent.truncate_size > osize) op->extent.truncate_size = osize; } @@ -97,7 +96,7 @@ static int calc_layout(struct ceph_file_layout *layout, u64 off, u64 *plen, if (op->op == CEPH_OSD_OP_WRITE) op->payload_len = *plen; - dout("calc_layout bno=%llx %llu~%llu\n", *bno, objoff, objlen); + dout("calc_layout objnum=%llx %llu~%llu\n", *objnum, *objoff, *objlen); return 0; } @@ -572,7 +571,9 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc, struct ceph_osd_req_op ops[2]; struct ceph_osd_request *req; unsigned int num_op = 1; - u64 bno = 0; + u64 objnum = 0; + u64 objoff = 0; + u64 objlen = 0; int r; memset(&ops, 0, sizeof ops); @@ -593,14 +594,15 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc, req->r_flags = flags; /* calculate max write size */ - r = calc_layout(layout, off, plen, ops, &bno); + r = calc_layout(layout, off, plen, ops, &objnum, &objoff, &objlen); if (r < 0) { ceph_osdc_put_request(req); return ERR_PTR(r); } req->r_file_layout = *layout; /* keep a copy */ - snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx", vino.ino, bno); + snprintf(req->r_oid, sizeof(req->r_oid), "%llx.%08llx", + vino.ino, objnum); req->r_oid_len = strlen(req->r_oid); ceph_osdc_build_request(req, off, num_op, ops, -- 2.20.1