From be919cad35548f616ccce979b4ab3d4ed6e1e28d Mon Sep 17 00:00:00 2001
From: David Disseldorp <ddiss@suse.de>
Date: Sat, 22 Aug 2015 18:43:42 +0200
Subject: [PATCH] rbd: add rbd_dev_getxattr() helper
Patch-mainline: Not yet, SES2 clustered LIO/RBD
References: fate#318836
Signed-off-by: David Disseldorp <ddiss@suse.de>
---
drivers/block/rbd.c | 79 ++++++++++++++++++++++++++++++++++++++++++++
include/linux/ceph/librbd.h | 2 +
2 files changed, 81 insertions(+)
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -1851,6 +1851,7 @@ static void rbd_osd_req_callback(struct
break;
case CEPH_OSD_OP_SETXATTR:
case CEPH_OSD_OP_CMPXATTR:
+ case CEPH_OSD_OP_GETXATTR:
obj_request_done_set(obj_request);
break;
default:
@@ -4805,6 +4806,84 @@ out:
}
EXPORT_SYMBOL(rbd_dev_cmpsetxattr);
+int rbd_dev_getxattr(struct rbd_device *rbd_dev, char *key, int max_val_len,
+ void **_val, int *val_len)
+{
+ struct ceph_osd_client *osdc = &rbd_dev->rbd_client->client->osdc;
+ struct rbd_obj_request *obj_request;
+ int page_count;
+ struct page **pages = NULL;
+ void *val;
+ int ret;
+
+ BUG_ON(!key);
+ BUG_ON(!_val || !val_len);
+
+ page_count = calc_pages_for(0, max_val_len);
+ pages = ceph_alloc_page_vector(page_count, GFP_KERNEL);
+ if (IS_ERR(pages))
+ return PTR_ERR(pages);
+
+ obj_request = rbd_obj_request_create(rbd_dev->header_name, 0,
+ max_val_len, OBJ_REQUEST_PAGES);
+ if (!obj_request) {
+ ceph_release_page_vector(pages, page_count);
+ return -ENOMEM;
+ }
+
+ obj_request->pages = pages;
+ obj_request->page_count = page_count;
+
+ obj_request->osd_req = rbd_osd_req_create(rbd_dev, OBJ_OP_READ, 1,
+ obj_request);
+ if (!obj_request->osd_req) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ret = osd_req_op_xattr_init(obj_request->osd_req, 0,
+ CEPH_OSD_OP_GETXATTR,
+ key, NULL, 0, 0, 0);
+ if (ret)
+ goto out;
+
+ osd_req_op_xattr_response_data_pages(obj_request->osd_req, 0,
+ obj_request->pages, max_val_len,
+ 0, false, false);
+ rbd_osd_req_format_read(obj_request);
+
+ ret = rbd_obj_request_submit(osdc, obj_request);
+ if (ret)
+ goto out;
+
+ ret = rbd_obj_request_wait(obj_request);
+ if (ret)
+ goto out;
+
+ ret = obj_request->result;
+ if (ret)
+ goto out;
+
+ rbd_assert(obj_request->xferred <= (u64)max_val_len);
+
+ val = kmalloc(obj_request->xferred, GFP_KERNEL);
+ if (!val) {
+ ret = -ENOMEM;
+ goto out;
+ }
+
+ ceph_copy_from_page_vector(pages, val, 0, obj_request->xferred);
+ *_val = val;
+ *val_len = obj_request->xferred;
+
+ ret = 0;
+out:
+ rbd_obj_request_put(obj_request);
+
+ return ret;
+}
+EXPORT_SYMBOL(rbd_dev_getxattr);
+
/*
* TODO: remove me or move to debugfs for final merge.
*/
--- a/include/linux/ceph/librbd.h
+++ b/include/linux/ceph/librbd.h
@@ -204,5 +204,7 @@ extern int rbd_dev_setxattr(struct rbd_d
extern int rbd_dev_cmpsetxattr(struct rbd_device *rbd_dev, char *key,
void *oldval, int oldval_len, void *newval,
int newval_len);
+extern int rbd_dev_getxattr(struct rbd_device *rbd_dev, char *key, int max_val_len,
+ void **_val, int *val_len);
#endif