[RFC PATCH 18/35] libceph, rbd: Convert some page arrays to ceph_databuf

David Howells
2025-03-13T23:35:08Z

Convert some miscellaneous page arrays to ceph_databuf containers.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Viacheslav Dubeyko <slava@dubeyko.com>
cc: Alex Markuze <amarkuze@redhat.com>
cc: Ilya Dryomov <idryomov@gmail.com>
cc: ceph-devel@vger.kernel.org
cc: linux-fsdevel@vger.kernel.org
---
drivers/block/rbd.c | 12 ++++-----
include/linux/ceph/osd_client.h | 3 +++
net/ceph/osd_client.c | 43 +++++++++++++++++++++------------
3 files changed, 36 insertions(+), 22 deletions(-)

diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index 078bb1e3e1da..eea12c7ab2a0 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -2108,7 +2108,7 @@ static int rbd_obj_calc_img_extents(struct rbd_obj_request *obj_req,

static int rbd_osd_setup_stat(struct ceph_osd_request *osd_req, int which)
{
- struct page **pages;
+ struct ceph_databuf *dbuf;

/*
* The response data for a STAT call consists of:
@@ -2118,14 +2118,12 @@ static int rbd_osd_setup_stat(struct ceph_osd_request *osd_req, int which)
* le32 tv_nsec;
* } mtime;
*/
- pages = ceph_alloc_page_vector(1, GFP_NOIO);
- if (IS_ERR(pages))
- return PTR_ERR(pages);
+ dbuf = ceph_databuf_reply_alloc(1, 8 + sizeof(struct ceph_timespec), GFP_NOIO);
+ if (!dbuf)
+ return -ENOMEM;

osd_req_op_init(osd_req, which, CEPH_OSD_OP_STAT, 0);
- osd_req_op_raw_data_in_pages(osd_req, which, pages,
- 8 + sizeof(struct ceph_timespec),
- 0, false, true);
+ osd_req_op_raw_data_in_databuf(osd_req, which, dbuf);
return 0;
}

diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h
index d31e59bd128c..6e126e212271 100644
--- a/include/linux/ceph/osd_client.h
+++ b/include/linux/ceph/osd_client.h
@@ -482,6 +482,9 @@ extern void osd_req_op_extent_osd_data_pages(struct ceph_osd_request *,
struct page **pages, u64 length,
u32 offset, bool pages_from_pool,
bool own_pages);
+void osd_req_op_raw_data_in_databuf(struct ceph_osd_request *osd_req,
+ unsigned int which,
+ struct ceph_databuf *databuf);
extern void osd_req_op_extent_osd_data_pagelist(struct ceph_osd_request *,
unsigned int which,
struct ceph_pagelist *pagelist);
diff --git a/net/ceph/osd_client.c b/net/ceph/osd_client.c
index b4adb299f9cd..64a06267e7b3 100644
--- a/net/ceph/osd_client.c
+++ b/net/ceph/osd_client.c
@@ -182,6 +182,17 @@ osd_req_op_extent_osd_data(struct ceph_osd_request *osd_req,
}
EXPORT_SYMBOL(osd_req_op_extent_osd_data);

+void osd_req_op_raw_data_in_databuf(struct ceph_osd_request *osd_req,
+ unsigned int which,
+ struct ceph_databuf *dbuf)
+{
+ struct ceph_osd_data *osd_data;
+
+ osd_data = osd_req_op_raw_data_in(osd_req, which);
+ ceph_osd_databuf_init(osd_data, dbuf);
+}
+EXPORT_SYMBOL(osd_req_op_raw_data_in_databuf);
+
void osd_req_op_raw_data_in_pages(struct ceph_osd_request *osd_req,
unsigned int which, struct page **pages,
u64 length, u32 offset,
@@ -5000,7 +5011,7 @@ int ceph_osdc_list_watchers(struct ceph_osd_client *osdc,
u32 *num_watchers)
{
struct ceph_osd_request *req;
- struct page **pages;
+ struct ceph_databuf *dbuf;
int ret;

req = ceph_osdc_alloc_request(osdc, NULL, 1, false, GFP_NOIO);
@@ -5011,16 +5022,16 @@ int ceph_osdc_list_watchers(struct ceph_osd_client *osdc,
ceph_oloc_copy(&req->r_base_oloc, oloc);
req->r_flags = CEPH_OSD_FLAG_READ;

- pages = ceph_alloc_page_vector(1, GFP_NOIO);
- if (IS_ERR(pages)) {
- ret = PTR_ERR(pages);
+ dbuf = ceph_databuf_reply_alloc(1, PAGE_SIZE, GFP_NOIO);
+ if (!dbuf) {
+ ret = -ENOMEM;
goto out_put_req;
}

osd_req_op_init(req, 0, CEPH_OSD_OP_LIST_WATCHERS, 0);
- ceph_osd_data_pages_init(osd_req_op_data(req, 0, list_watchers,
- response_data),
- pages, PAGE_SIZE, 0, false, true);
+ ceph_osd_databuf_init(osd_req_op_data(req, 0, list_watchers,
+ response_data),
+ dbuf);

ret = ceph_osdc_alloc_messages(req, GFP_NOIO);
if (ret)
@@ -5029,10 +5040,11 @@ int ceph_osdc_list_watchers(struct ceph_osd_client *osdc,
ceph_osdc_start_request(osdc, req);
ret = ceph_osdc_wait_request(osdc, req);
if (ret >= 0) {
- void *p = page_address(pages[0]);
+ void *p = kmap_ceph_databuf_page(dbuf, 0);
void *const end = p + req->r_ops[0].outdata_len;

ret = decode_watchers(&p, end, watchers, num_watchers);
+ kunmap(p);
}

out_put_req:
@@ -5246,12 +5258,12 @@ int osd_req_op_copy_from_init(struct ceph_osd_request *req,
u8 copy_from_flags)
{
struct ceph_osd_req_op *op;
- struct page **pages;
+ struct ceph_databuf *dbuf;
void *p, *end;

- pages = ceph_alloc_page_vector(1, GFP_KERNEL);
- if (IS_ERR(pages))
- return PTR_ERR(pages);
+ dbuf = ceph_databuf_req_alloc(1, PAGE_SIZE, GFP_KERNEL);
+ if (!dbuf)
+ return -ENOMEM;

op = osd_req_op_init(req, 0, CEPH_OSD_OP_COPY_FROM2,
dst_fadvise_flags);
@@ -5260,16 +5272,17 @@ int osd_req_op_copy_from_init(struct ceph_osd_request *req,
op->copy_from.flags = copy_from_flags;
op->copy_from.src_fadvise_flags = src_fadvise_flags;

- p = page_address(pages[0]);
+ p = kmap_ceph_databuf_page(dbuf, 0);
end = p + PAGE_SIZE;
ceph_encode_string(&p, src_oid->name, src_oid->name_len);
encode_oloc(&p, src_oloc);
ceph_encode_32(&p, truncate_seq);
ceph_encode_64(&p, truncate_size);
op->indata_len = PAGE_SIZE - (end - p);
+ ceph_databuf_added_data(dbuf, op->indata_len);
+ kunmap_local(p);

- ceph_osd_data_pages_init(&op->copy_from.osd_data, pages,
- op->indata_len, 0, false, true);
+ ceph_osd_databuf_init(&op->copy_from.osd_data, dbuf);
return 0;
}
EXPORT_SYMBOL(osd_req_op_copy_from_init);