From: Mike Christie <micha...@cs.wisc.edu>
This moves structs and other definitions needed by the lio rbd
backend module to a header.
Signed-off-by: Mike Christie <micha...@cs.wisc.edu>
---
drivers/block/rbd.c | 146 +------------------------------------
include/linux/ceph/librbd.h | 174 ++++++++++++++++++++++++++++++++++++++++++++
2 files changed, 175 insertions(+), 145 deletions(-)
create mode 100644 include/linux/ceph/librbd.h
diff --git a/drivers/block/rbd.c b/drivers/block/rbd.c
index d89749c..248af2b 100644
--- a/drivers/block/rbd.c
+++ b/drivers/block/rbd.c
@@ -32,6 +32,7 @@
#include <linux/ceph/osd_client.h>
#include <linux/ceph/mon_client.h>
#include <linux/ceph/decode.h>
+#include <linux/ceph/librbd.h>
#include <linux/parser.h>
#include <linux/bsearch.h>
@@ -51,15 +52,6 @@
#define RBD_DEBUG /* Activate rbd_assert() calls */
/*
- * The basic unit of block I/O is a sector. It is interpreted in a
- * number of contexts in Linux (blk, bio, genhd), but the default is
- * universally 512 bytes. These symbols are just slightly more
- * meaningful than the bare numbers they represent.
- */
-#define SECTOR_SHIFT 9
-#define SECTOR_SIZE (1ULL << SECTOR_SHIFT)
-
-/*
* Increment the given counter and return its updated value.
* If the counter is already 0 it will not be incremented.
* If the counter is already at its maximum value returns
@@ -92,8 +84,6 @@ static int atomic_dec_return_safe(atomic_t *v)
return -EINVAL;
}
-#define RBD_DRV_NAME "rbd"
-
#define RBD_MINORS_PER_MAJOR 256
#define RBD_SINGLE_MAJOR_PART_SHIFT 4
@@ -125,35 +115,6 @@ static int atomic_dec_return_safe(atomic_t *v)
#define RBD_FEATURES_SUPPORTED (RBD_FEATURES_ALL)
/*
- * An RBD device name will be "rbd#", where the "rbd" comes from
- * RBD_DRV_NAME above, and # is a unique integer identifier.
- * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big
- * enough to hold all possible device names.
- */
-#define DEV_NAME_LEN 32
-#define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1)
-
-/*
- * block device image metadata (in-memory version)
- */
-struct rbd_image_header {
- /* These six fields never change for a given rbd image */
- char *object_prefix;
- __u8 obj_order;
- __u8 crypt_type;
- __u8 comp_type;
- u64 stripe_unit;
- u64 stripe_count;
- u64 features; /* Might be changeable someday? */
-
- /* The remaining fields need to be updated occasionally */
- u64 image_size;
- struct ceph_snap_context *snapc;
- char *snap_names; /* format 1 only */
- u64 *snap_sizes; /* format 1 only */
-};
-
-/*
* An rbd image specification.
*
* The tuple (pool_id, image_id, snap_id) is sufficient to uniquely
@@ -200,26 +161,11 @@ struct rbd_client {
struct list_head node;
};
-struct rbd_img_request;
-typedef void (*rbd_img_callback_t)(struct rbd_img_request *);
-
#define BAD_WHICH U32_MAX /* Good which or bad which,
which? */
struct rbd_obj_request;
typedef void (*rbd_obj_callback_t)(struct rbd_obj_request *);
-enum obj_request_type {
- OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES, OBJ_REQUEST_SG,
-};
-
-enum obj_operation_type {
- OBJ_OP_WRITE,
- OBJ_OP_READ,
- OBJ_OP_DISCARD,
- OBJ_OP_CMP_AND_WRITE,
- OBJ_OP_WRITESAME,
-};
-
enum obj_req_flags {
OBJ_REQ_DONE, /* completion flag: not done = 0, done = 1 */
OBJ_REQ_IMG_DATA, /* object usage: standalone = 0, image = 1 */
@@ -295,39 +241,6 @@ enum img_req_flags {
IMG_REQ_WRITESAME, /* normal = 0, write same = 1 */
};
-struct rbd_img_request {
- struct rbd_device *rbd_dev;
- u64 offset; /* starting image byte offset */
- u64 length; /* byte count from offset */
- unsigned long flags;
-
- u64 snap_id; /* for reads */
- struct ceph_snap_context *snapc; /* for writes */
-
- struct request *rq; /* block request */
- struct rbd_obj_request *obj_request; /* obj req initiator */
- void *lio_cmd_data; /* lio specific data */
-
- struct page **copyup_pages;
- u32 copyup_page_count;
- spinlock_t completion_lock;/* protects next_completion */
- u32 next_completion;
- rbd_img_callback_t callback;
- /*
- * xferred is the bytes that have successfully been transferred.
- * completed is the bytes that have been accounted for and includes
- * both failed and successfully transffered bytes.
- */
- u64 xferred;/* aggregate bytes transferred */
- u64 completed;
- int result; /* first nonzero obj_request result */
-
- u32 obj_request_count;
- struct list_head obj_requests; /* rbd_obj_request structs */
-
- struct kref kref;
-};
-
#define for_each_obj_request(ireq, oreq) \
list_for_each_entry(oreq, &(ireq)->obj_requests, links)
#define for_each_obj_request_from(ireq, oreq) \
@@ -335,61 +248,6 @@ struct rbd_img_request {
#define for_each_obj_request_safe(ireq, oreq, n) \
list_for_each_entry_safe_reverse(oreq, n, &(ireq)->obj_requests, links)
-struct rbd_mapping {
- u64 size;
- u64 features;
- bool read_only;
-};
-
-/*
- * a single device
- */
-struct rbd_device {
- int dev_id; /* blkdev unique id */
-
- int major; /* blkdev assigned major */
- int minor;
- struct gendisk *disk; /* blkdev's gendisk and rq */
-
- u32 image_format; /* Either 1 or 2 */
- struct rbd_client *rbd_client;
-
- char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */
-
- spinlock_t lock; /* queue, flags, open_count */
-
- struct rbd_image_header header;
- unsigned long flags; /* possibly lock protected */
- struct rbd_spec *spec;
- struct rbd_options *opts;
-
- char *header_name;
-
- struct ceph_file_layout layout;
-
- struct ceph_osd_event *watch_event;
- struct rbd_obj_request *watch_request;
-
- struct rbd_spec *parent_spec;
- u64 parent_overlap;
- atomic_t parent_ref;
- struct rbd_device *parent;
-
- /* Block layer tags. */
- struct blk_mq_tag_set tag_set;
-
- /* protects updating the header */
- struct rw_semaphore header_rwsem;
-
- struct rbd_mapping mapping;
-
- struct list_head node;
-
- /* sysfs related */
- struct device dev;
- unsigned long open_count; /* protected by lock */
-};
-
/*
* Flag bits for rbd_dev->flags. If atomicity is required,
* rbd_dev->lock is used to protect access.
@@ -429,8 +287,6 @@ static bool single_major = false;
module_param(single_major, bool, S_IRUGO);
MODULE_PARM_DESC(single_major, "Use a single major number for all rbd devices
(default: false)");
-static int rbd_img_request_submit(struct rbd_img_request *img_request);
-
static void rbd_dev_device_release(struct device *dev);
static ssize_t rbd_add(struct bus_type *bus, const char *buf,
diff --git a/include/linux/ceph/librbd.h b/include/linux/ceph/librbd.h
new file mode 100644
index 0000000..6e25dfd
--- /dev/null
+++ b/include/linux/ceph/librbd.h
@@ -0,0 +1,174 @@
+#ifndef _LIBRBD_H
+#define _LIBRBD_H
+
+#include <linux/blk-mq.h>
+#include <linux/device.h>
+
+/*
+ * The basic unit of block I/O is a sector. It is interpreted in a
+ * number of contexts in Linux (blk, bio, genhd), but the default is
+ * universally 512 bytes. These symbols are just slightly more
+ * meaningful than the bare numbers they represent.
+ */
+#define SECTOR_SHIFT 9
+#define SECTOR_SIZE (1ULL << SECTOR_SHIFT)
+
+#define RBD_DRV_NAME "rbd"
+
+/*
+ * An RBD device name will be "rbd#", where the "rbd" comes from
+ * RBD_DRV_NAME above, and # is a unique integer identifier.
+ * MAX_INT_FORMAT_WIDTH is used in ensuring DEV_NAME_LEN is big
+ * enough to hold all possible device names.
+ */
+#define DEV_NAME_LEN 32
+#define MAX_INT_FORMAT_WIDTH ((5 * sizeof (int)) / 2 + 1)
+
+/*
+ * block device image metadata (in-memory version)
+ */
+struct rbd_image_header {
+ /* These six fields never change for a given rbd image */
+ char *object_prefix;
+ __u8 obj_order;
+ __u8 crypt_type;
+ __u8 comp_type;
+ u64 stripe_unit;
+ u64 stripe_count;
+ u64 features; /* Might be changeable someday? */
+
+ /* The remaining fields need to be updated occasionally */
+ u64 image_size;
+ struct ceph_snap_context *snapc;
+ char *snap_names; /* format 1 only */
+ u64 *snap_sizes; /* format 1 only */
+};
+
+enum obj_request_type {
+ OBJ_REQUEST_NODATA, OBJ_REQUEST_BIO, OBJ_REQUEST_PAGES, OBJ_REQUEST_SG,
+};
+
+enum obj_operation_type {
+ OBJ_OP_WRITE,
+ OBJ_OP_READ,
+ OBJ_OP_DISCARD,
+ OBJ_OP_CMP_AND_WRITE,
+ OBJ_OP_WRITESAME,
+};
+
+struct rbd_img_request;
+typedef void (*rbd_img_callback_t)(struct rbd_img_request *);
+
+struct rbd_obj_request;
+
+struct rbd_img_request {
+ struct rbd_device *rbd_dev;
+ u64 offset; /* starting image byte offset */
+ u64 length; /* byte count from offset */
+ unsigned long flags;
+
+ u64 snap_id; /* for reads */
+ struct ceph_snap_context *snapc; /* for writes */
+
+ struct request *rq; /* block request */
+ struct rbd_obj_request *obj_request; /* obj req initiator */
+ void *lio_cmd_data; /* lio specific data */
+
+ struct page **copyup_pages;
+ u32 copyup_page_count;
+ spinlock_t completion_lock;/* protects next_completion */
+ u32 next_completion;
+ rbd_img_callback_t callback;
+ /*
+ * xferred is the bytes that have successfully been transferred.
+ * completed is the bytes that have been accounted for and includes
+ * failures.
+ */
+ u64 xferred;/* aggregate bytes transferred */
+ u64 completed;/* aggregate bytes completed */
+ int result; /* first nonzero obj_request result */
+
+ u32 obj_request_count;
+ struct list_head obj_requests; /* rbd_obj_request structs */
+
+ struct kref kref;
+};
+
+struct rbd_mapping {
+ u64 size;
+ u64 features;
+ bool read_only;
+};
+
+struct rbd_client;
+struct rbd_spec;
+struct rbd_options;
+
+/*
+ * a single device
+ */
+struct rbd_device {
+ int dev_id; /* blkdev unique id */
+
+ int major; /* blkdev assigned major */
+ int minor;
+ struct gendisk *disk; /* blkdev's gendisk and rq */
+
+ u32 image_format; /* Either 1 or 2 */
+ struct rbd_client *rbd_client;
+
+ char name[DEV_NAME_LEN]; /* blkdev name, e.g. rbd3 */
+
+ spinlock_t lock; /* queue, flags, open_count */
+
+ struct rbd_image_header header;
+ unsigned long flags; /* possibly lock protected */
+ struct rbd_spec *spec;
+ struct rbd_options *opts;
+
+ char *header_name;
+
+ struct ceph_file_layout layout;
+
+ struct ceph_osd_event *watch_event;
+ struct rbd_obj_request *watch_request;
+
+ struct rbd_spec *parent_spec;
+ u64 parent_overlap;
+ atomic_t parent_ref;
+ struct rbd_device *parent;
+
+ /* Block layer tags. */
+ struct blk_mq_tag_set tag_set;
+
+ /* protects updating the header */
+ struct rw_semaphore header_rwsem;
+
+ struct rbd_mapping mapping;
+
+ struct list_head node;
+
+ /* sysfs related */
+ struct device dev;
+ unsigned long open_count; /* protected by lock */
+};
+
+extern struct rbd_img_request *rbd_img_request_create(
+ struct rbd_device *rbd_dev,
+ u64 offset, u64 length,
+ enum obj_operation_type op_type,
+ struct ceph_snap_context *snapc);
+extern int rbd_img_cmp_and_write_request_fill(
+ struct rbd_img_request *img_request,
+ struct scatterlist *cmp_sgl,
+ u64 cmp_length,
+ struct scatterlist *write_sgl,
+ u64 write_length,
+ struct page **response_pages,
+ u64 response_length);
+extern int rbd_img_request_fill(struct rbd_img_request *img_request,
+ enum obj_request_type type, void *data_desc);
+extern int rbd_img_request_submit(struct rbd_img_request *img_request);
+extern void rbd_img_request_put(struct rbd_img_request *img_request);
+
+#endif
--
1.8.3.1
--
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