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/*
BD translator - Exports Block devices on server side as regular
files to client
Copyright IBM, Corp. 2012
This file is part of GlusterFS.
Author:
M. Mohan Kumar <mohan@in.ibm.com>
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#ifndef _BD_H
#define _BD_H
#ifdef HAVE_LIBAIO
#include <libaio.h>
#endif
#include "xlator.h"
#include "mem-types.h"
#define BD_XLATOR "block device mapper xlator"
#define BACKEND_VG "vg"
#define GF_XATTR "user.glusterfs"
#define BD_XATTR GF_XATTR ".bd"
#define BD_LV "lv"
#define BD_THIN "thin"
#define VOL_TYPE "volume.type"
#define VOL_CAPS "volume.caps"
#define ALIGN_SIZE 4096
#define BD_CAPS_BD 0x01
#define BD_CAPS_THIN 0x02
#define BD_CAPS_OFFLOAD_COPY 0x04
#define BD_CAPS_OFFLOAD_SNAPSHOT 0x08
#define BD_CAPS_OFFLOAD_ZERO 0x20
#define BD_CLONE "clone"
#define BD_SNAPSHOT "snapshot"
#define BD_MERGE "merge"
#define BD_ORIGIN "list-origin"
#define IOV_NR 4
#define IOV_SIZE (64 * 1024)
#define ALIGN_SIZE 4096
#define LINKTO "trusted.glusterfs.dht.linkto"
#define MAX_NO_VECT 1024
#define BD_VALIDATE_MEM_ALLOC(buff, op_errno, label) \
if (!buff) { \
op_errno = ENOMEM; \
gf_log (this->name, GF_LOG_ERROR, "out of memory"); \
goto label; \
}
#define BD_VALIDATE_LOCAL_OR_GOTO(local, op_errno, label) \
if (!local) { \
op_errno = EINVAL; \
goto label; \
}
#define BD_STACK_UNWIND(typ, frame, args ...) do { \
bd_local_t *__local = frame->local; \
xlator_t *__this = frame->this; \
\
frame->local = NULL; \
STACK_UNWIND_STRICT (typ, frame, args); \
if (__local) \
bd_local_free (__this, __local); \
} while (0)
typedef char bd_gfid_t[GF_UUID_BUF_SIZE];
/**
* bd_fd - internal structure
*/
typedef struct bd_fd {
int fd;
int32_t flag;
int odirect;
} bd_fd_t;
typedef struct bd_priv {
lvm_t handle;
char *vg;
char *pool;
int caps;
gf_boolean_t aio_init_done;
gf_boolean_t aio_capable;
gf_boolean_t aio_configured;
#ifdef HAVE_LIBAIO
io_context_t ctxp;
pthread_t aiothread;
#endif
} bd_priv_t;
typedef enum bd_type {
BD_TYPE_NONE,
BD_TYPE_LV,
} bd_type_t;
typedef struct {
struct iatt iatt;
char *type;
} bd_attr_t;
typedef enum {
BD_OF_NONE,
BD_OF_CLONE,
BD_OF_SNAPSHOT,
BD_OF_MERGE,
} bd_offload_t;
typedef struct {
dict_t *dict;
bd_attr_t *bdatt;
inode_t *inode;
loc_t loc;
fd_t *fd;
data_t *data; /* for setxattr */
bd_offload_t offload;
uint64_t size;
loc_t *dloc;
} bd_local_t;
/* Prototypes */
int bd_inode_ctx_set (inode_t *inode, xlator_t *this, bd_attr_t *ctx);
int bd_inode_ctx_get (inode_t *inode, xlator_t *this, bd_attr_t **ctx);
int bd_scan_vg (xlator_t *this, bd_priv_t *priv);
bd_local_t *bd_local_init (call_frame_t *frame, xlator_t *this);
void bd_local_free (xlator_t *this, bd_local_t *local);
int bd_fd_ctx_get (xlator_t *this, fd_t *fd, bd_fd_t **bdfd);
char *page_aligned_alloc (size_t size, char **aligned_buf);
int bd_validate_bd_xattr (xlator_t *this, char *bd, char **type,
uint64_t *lv_size, uuid_t uuid);
uint64_t bd_get_default_extent (bd_priv_t *priv);
uint64_t bd_adjust_size (bd_priv_t *priv, size_t size);
int bd_create (uuid_t uuid, uint64_t size, char *type, bd_priv_t *priv);
int bd_resize (bd_priv_t *priv, uuid_t uuid, size_t size);
int bd_delete_lv (bd_priv_t *priv, const char *lv_name, int *op_errno);
int bd_snapshot_create (bd_local_t *local, bd_priv_t *priv);
int bd_clone (bd_local_t *local, bd_priv_t *priv);
int bd_merge (bd_priv_t *priv, uuid_t gfid);
int bd_get_origin (bd_priv_t *priv, loc_t *loc, fd_t *fd, dict_t *dict);
void bd_update_amtime(struct iatt *iatt, int flag);
int bd_snapshot_create (bd_local_t *local, bd_priv_t *priv);
int bd_clone (bd_local_t *local, bd_priv_t *priv);
int bd_merge (bd_priv_t *priv, uuid_t gfid);
int bd_get_origin (bd_priv_t *priv, loc_t *loc, fd_t *fd, dict_t *dict);
int bd_do_zerofill(call_frame_t *frame, xlator_t *this, fd_t *fd,
off_t offset, size_t len, struct iatt *prebuf,
struct iatt *postbuf);
#endif
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