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ceph: refactor osdc requests creation functions
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The osd requests creation are being decoupled from the
vino parameter, allowing clients using the osd to use
other arbitrary object names that are not necessarily
vino based. Also, calc_raw_layout now takes a snap id.

Signed-off-by: Yehuda Sadeh <yehuda@hq.newdream.net>
Signed-off-by: Sage Weil <sage@newdream.net>
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Yehuda Sadeh authored and Sage Weil committed Oct 20, 2010
1 parent 7669a2c commit 3499e8a
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Showing 2 changed files with 155 additions and 57 deletions.
187 changes: 130 additions & 57 deletions fs/ceph/osd_client.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -22,6 +22,35 @@ static int __kick_requests(struct ceph_osd_client *osdc,

static void kick_requests(struct ceph_osd_client *osdc, struct ceph_osd *osd);

void ceph_calc_raw_layout(struct ceph_osd_client *osdc,
struct ceph_file_layout *layout,
u64 snapid,
u64 off, u64 len, u64 *bno,
struct ceph_osd_request *req)
{
struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
struct ceph_osd_op *op = (void *)(reqhead + 1);
u64 orig_len = len;
u64 objoff, objlen; /* extent in object */

reqhead->snapid = cpu_to_le64(snapid);

/* object extent? */
ceph_calc_file_object_mapping(layout, off, &len, bno,
&objoff, &objlen);
if (len < orig_len)
dout(" skipping last %llu, final file extent %llu~%llu\n",
orig_len - len, off, len);

op->extent.offset = cpu_to_le64(objoff);
op->extent.length = cpu_to_le64(objlen);
req->r_num_pages = calc_pages_for(off, len);

dout("calc_layout bno=%llx %llu~%llu (%d pages)\n",
*bno, objoff, objlen, req->r_num_pages);

}

/*
* Implement client access to distributed object storage cluster.
*
Expand All @@ -48,34 +77,17 @@ static void kick_requests(struct ceph_osd_client *osdc, struct ceph_osd *osd);
* fill osd op in request message.
*/
static void calc_layout(struct ceph_osd_client *osdc,
struct ceph_vino vino, struct ceph_file_layout *layout,
struct ceph_vino vino,
struct ceph_file_layout *layout,
u64 off, u64 *plen,
struct ceph_osd_request *req)
{
struct ceph_osd_request_head *reqhead = req->r_request->front.iov_base;
struct ceph_osd_op *op = (void *)(reqhead + 1);
u64 orig_len = *plen;
u64 objoff, objlen; /* extent in object */
u64 bno;

reqhead->snapid = cpu_to_le64(vino.snap);

/* object extent? */
ceph_calc_file_object_mapping(layout, off, plen, &bno,
&objoff, &objlen);
if (*plen < orig_len)
dout(" skipping last %llu, final file extent %llu~%llu\n",
orig_len - *plen, off, *plen);
ceph_calc_raw_layout(osdc, layout, vino.snap, off, *plen, &bno, req);

sprintf(req->r_oid, "%llx.%08llx", vino.ino, bno);
req->r_oid_len = strlen(req->r_oid);

op->extent.offset = cpu_to_le64(objoff);
op->extent.length = cpu_to_le64(objlen);
req->r_num_pages = calc_pages_for(off, *plen);

dout("calc_layout %s (%d) %llu~%llu (%d pages)\n",
req->r_oid, req->r_oid_len, objoff, objlen, req->r_num_pages);
}

/*
Expand Down Expand Up @@ -108,43 +120,34 @@ void ceph_osdc_release_request(struct kref *kref)
kfree(req);
}

/*
* build new request AND message, calculate layout, and adjust file
* extent as needed.
*
* if the file was recently truncated, we include information about its
* old and new size so that the object can be updated appropriately. (we
* avoid synchronously deleting truncated objects because it's slow.)
*
* if @do_sync, include a 'startsync' command so that the osd will flush
* data quickly.
*/
struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
struct ceph_file_layout *layout,
struct ceph_vino vino,
u64 off, u64 *plen,
int opcode, int flags,
struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
int flags,
struct ceph_snap_context *snapc,
int do_sync,
u32 truncate_seq,
u64 truncate_size,
struct timespec *mtime,
bool use_mempool, int num_reply)
bool use_mempool,
gfp_t gfp_flags,
struct page **pages)
{
struct ceph_osd_request *req;
struct ceph_msg *msg;
struct ceph_osd_request_head *head;
struct ceph_osd_op *op;
void *p;
int num_op = 1 + do_sync;
size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
int i;
size_t msg_size = sizeof(struct ceph_osd_request_head) +
num_op*sizeof(struct ceph_osd_op);

if (use_mempool) {
req = mempool_alloc(osdc->req_mempool, gfp_flags);
memset(req, 0, sizeof(*req));
} else {
req = kzalloc(sizeof(*req), gfp_flags);
}
if (!req)
return NULL;

if (use_mempool) {
req = mempool_alloc(osdc->req_mempool, GFP_NOFS);
req = mempool_alloc(osdc->req_mempool, gfp_flags);
memset(req, 0, sizeof(*req));
} else {
req = kzalloc(sizeof(*req), GFP_NOFS);
req = kzalloc(sizeof(*req), gfp_flags);
}
if (req == NULL)
return NULL;
Expand All @@ -164,7 +167,7 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
msg = ceph_msgpool_get(&osdc->msgpool_op_reply, 0);
else
msg = ceph_msg_new(CEPH_MSG_OSD_OPREPLY,
OSD_OPREPLY_FRONT_LEN, GFP_NOFS);
OSD_OPREPLY_FRONT_LEN, gfp_flags);
if (!msg) {
ceph_osdc_put_request(req);
return NULL;
Expand All @@ -178,18 +181,48 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
if (use_mempool)
msg = ceph_msgpool_get(&osdc->msgpool_op, 0);
else
msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, GFP_NOFS);
msg = ceph_msg_new(CEPH_MSG_OSD_OP, msg_size, gfp_flags);
if (!msg) {
ceph_osdc_put_request(req);
return NULL;
}
msg->hdr.type = cpu_to_le16(CEPH_MSG_OSD_OP);
memset(msg->front.iov_base, 0, msg->front.iov_len);

req->r_request = msg;
req->r_pages = pages;

return req;
}

/*
* build new request AND message
*
*/
void ceph_osdc_build_request(struct ceph_osd_request *req,
u64 off, u64 *plen,
int opcode,
struct ceph_snap_context *snapc,
int do_sync,
u32 truncate_seq,
u64 truncate_size,
struct timespec *mtime,
const char *oid,
int oid_len)
{
struct ceph_msg *msg = req->r_request;
struct ceph_osd_request_head *head;
struct ceph_osd_op *op;
void *p;
int num_op = 1 + do_sync;
size_t msg_size = sizeof(*head) + num_op*sizeof(*op);
int i;
int flags = req->r_flags;

head = msg->front.iov_base;
op = (void *)(head + 1);
p = (void *)(op + num_op);

req->r_request = msg;
req->r_snapc = ceph_get_snap_context(snapc);

head->client_inc = cpu_to_le32(1); /* always, for now. */
Expand All @@ -199,10 +232,6 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
head->num_ops = cpu_to_le16(num_op);
op->op = cpu_to_le16(opcode);

/* calculate max write size */
calc_layout(osdc, vino, layout, off, plen, req);
req->r_file_layout = *layout; /* keep a copy */

if (flags & CEPH_OSD_FLAG_WRITE) {
req->r_request->hdr.data_off = cpu_to_le16(off);
req->r_request->hdr.data_len = cpu_to_le32(*plen);
Expand All @@ -212,9 +241,9 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
op->extent.truncate_seq = cpu_to_le32(truncate_seq);

/* fill in oid */
head->object_len = cpu_to_le32(req->r_oid_len);
memcpy(p, req->r_oid, req->r_oid_len);
p += req->r_oid_len;
head->object_len = cpu_to_le32(oid_len);
memcpy(p, oid, oid_len);
p += oid_len;

if (do_sync) {
op++;
Expand All @@ -233,6 +262,50 @@ struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
msg_size = p - msg->front.iov_base;
msg->front.iov_len = msg_size;
msg->hdr.front_len = cpu_to_le32(msg_size);
return;
}

/*
* build new request AND message, calculate layout, and adjust file
* extent as needed.
*
* if the file was recently truncated, we include information about its
* old and new size so that the object can be updated appropriately. (we
* avoid synchronously deleting truncated objects because it's slow.)
*
* if @do_sync, include a 'startsync' command so that the osd will flush
* data quickly.
*/
struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *osdc,
struct ceph_file_layout *layout,
struct ceph_vino vino,
u64 off, u64 *plen,
int opcode, int flags,
struct ceph_snap_context *snapc,
int do_sync,
u32 truncate_seq,
u64 truncate_size,
struct timespec *mtime,
bool use_mempool, int num_reply)
{
struct ceph_osd_request *req =
ceph_osdc_alloc_request(osdc, flags,
snapc, do_sync,
use_mempool,
GFP_NOFS, NULL);
if (IS_ERR(req))
return req;

/* calculate max write size */
calc_layout(osdc, vino, layout, off, plen, req);
req->r_file_layout = *layout; /* keep a copy */

ceph_osdc_build_request(req, off, plen, opcode,
snapc, do_sync,
truncate_seq, truncate_size,
mtime,
req->r_oid, req->r_oid_len);

return req;
}

Expand Down
25 changes: 25 additions & 0 deletions fs/ceph/osd_client.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -119,6 +119,31 @@ extern void ceph_osdc_handle_reply(struct ceph_osd_client *osdc,
extern void ceph_osdc_handle_map(struct ceph_osd_client *osdc,
struct ceph_msg *msg);

extern void ceph_calc_raw_layout(struct ceph_osd_client *osdc,
struct ceph_file_layout *layout,
u64 snapid,
u64 off, u64 len, u64 *bno,
struct ceph_osd_request *req);

extern struct ceph_osd_request *ceph_osdc_alloc_request(struct ceph_osd_client *osdc,
int flags,
struct ceph_snap_context *snapc,
int do_sync,
bool use_mempool,
gfp_t gfp_flags,
struct page **pages);

extern void ceph_osdc_build_request(struct ceph_osd_request *req,
u64 off, u64 *plen,
int opcode,
struct ceph_snap_context *snapc,
int do_sync,
u32 truncate_seq,
u64 truncate_size,
struct timespec *mtime,
const char *oid,
int oid_len);

extern struct ceph_osd_request *ceph_osdc_new_request(struct ceph_osd_client *,
struct ceph_file_layout *layout,
struct ceph_vino vino,
Expand Down

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