libceph: support the RADOS copy-from operation

Add support for performing remote object copies using the 'copy-from'
operation.

[ Add COPY_FROM to get_num_data_items(). ]

Signed-off-by: Luis Henriques <lhenriques@suse.com>
Reviewed-by: Ilya Dryomov <idryomov@gmail.com>
Signed-off-by: Ilya Dryomov <idryomov@gmail.com>

2 files changed, 45 insertions, 0 deletions

diff --git a/include/linux/ceph/osd_client.h b/include/linux/ceph/osd_client.h
index f3e828460c91..7a2af5034278 100644
--- a/include/linux/ceph/osd_client.h
+++ b/include/linux/ceph/osd_client.h
@@ -136,6 +136,13 @@ struct ceph_osd_req_op {
 			u64 expected_object_size;
 			u64 expected_write_size;
 		} alloc_hint;
+		struct {
+			u64 snapid;
+			u64 src_version;
+			u8 flags;
+			u32 src_fadvise_flags;
+			struct ceph_osd_data osd_data;
+		} copy_from;
 	};
 };
 
@@ -510,6 +517,16 @@ extern int ceph_osdc_writepages(struct ceph_osd_client *osdc,
 				struct timespec64 *mtime,
 				struct page **pages, int nr_pages);
 
+int ceph_osdc_copy_from(struct ceph_osd_client *osdc,
+			u64 src_snapid, u64 src_version,
+			struct ceph_object_id *src_oid,
+			struct ceph_object_locator *src_oloc,
+			u32 src_fadvise_flags,
+			struct ceph_object_id *dst_oid,
+			struct ceph_object_locator *dst_oloc,
+			u32 dst_fadvise_flags,
+			u8 copy_from_flags);
+
 /* watch/notify */
 struct ceph_osd_linger_request *
 ceph_osdc_watch(struct ceph_osd_client *osdc,
diff --git a/include/linux/ceph/rados.h b/include/linux/ceph/rados.h
index f1988387c5ad..3eb0e55665b4 100644
--- a/include/linux/ceph/rados.h
+++ b/include/linux/ceph/rados.h
@@ -410,6 +410,14 @@ enum {
 enum {
 	CEPH_OSD_OP_FLAG_EXCL = 1,      /* EXCL object create */
 	CEPH_OSD_OP_FLAG_FAILOK = 2,    /* continue despite failure */
+	CEPH_OSD_OP_FLAG_FADVISE_RANDOM	    = 0x4, /* the op is random */
+	CEPH_OSD_OP_FLAG_FADVISE_SEQUENTIAL = 0x8, /* the op is sequential */
+	CEPH_OSD_OP_FLAG_FADVISE_WILLNEED   = 0x10,/* data will be accessed in
+						      the near future */
+	CEPH_OSD_OP_FLAG_FADVISE_DONTNEED   = 0x20,/* data will not be accessed
+						      in the near future */
+	CEPH_OSD_OP_FLAG_FADVISE_NOCACHE    = 0x40,/* data will be accessed only
+						      once by this client */
 };
 
 #define EOLDSNAPC    ERESTART  /* ORDERSNAP flag set; writer has old snapc*/
@@ -432,6 +440,15 @@ enum {
 };
 
 enum {
+	CEPH_OSD_COPY_FROM_FLAG_FLUSH = 1,       /* part of a flush operation */
+	CEPH_OSD_COPY_FROM_FLAG_IGNORE_OVERLAY = 2, /* ignore pool overlay */
+	CEPH_OSD_COPY_FROM_FLAG_IGNORE_CACHE = 4,   /* ignore osd cache logic */
+	CEPH_OSD_COPY_FROM_FLAG_MAP_SNAP_CLONE = 8, /* map snap direct to
+						     * cloneid */
+	CEPH_OSD_COPY_FROM_FLAG_RWORDERED = 16,     /* order with write */
+};
+
+enum {
 	CEPH_OSD_WATCH_OP_UNWATCH = 0,
 	CEPH_OSD_WATCH_OP_LEGACY_WATCH = 1,
 	/* note: use only ODD ids to prevent pre-giant code from
@@ -497,6 +514,17 @@ struct ceph_osd_op {
 			__le64 expected_object_size;
 			__le64 expected_write_size;
 		} __attribute__ ((packed)) alloc_hint;
+		struct {
+			__le64 snapid;
+			__le64 src_version;
+			__u8 flags; /* CEPH_OSD_COPY_FROM_FLAG_* */
+			/*
+			 * CEPH_OSD_OP_FLAG_FADVISE_*: fadvise flags
+			 * for src object, flags for dest object are in
+			 * ceph_osd_op::flags.
+			 */
+			__le32 src_fadvise_flags;
+		} __attribute__ ((packed)) copy_from;
 	};
 	__le32 payload_len;
 } __attribute__ ((packed));