/*
   Copyright (c) 2014 Red Hat, Inc. <http://www.redhat.com>
   This file is part of GlusterFS.

   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 __SNAP_VIEW_H__
#define __SNAP_VIEW_H__

#include "dict.h"
#include "defaults.h"
#include "mem-types.h"
#include "call-stub.h"
#include "byte-order.h"
#include "iatt.h"
#include <ctype.h>
#include <sys/uio.h>
#include "glusterfs.h"
#include "xlator.h"
#include "logging.h"
#include "glfs.h"
#include "common-utils.h"
#include "glfs-handles.h"
#include "glfs-internal.h"
#include "glusterfs3-xdr.h"
#include "glusterfs-acl.h"
#include "syncop.h"
#include "list.h"
#include "timer.h"
#include "rpc-clnt.h"
#include "protocol-common.h"
#include "xdr-generic.h"


#define DEFAULT_SVD_LOG_FILE_DIRECTORY DATADIR "/log/glusterfs"

#define SNAP_VIEW_MAX_GLFS_T            256
#define SNAP_VIEW_MAX_GLFS_FDS          1024
#define SNAP_VIEW_MAX_GLFS_OBJ_HANDLES  1024

#define SVS_STACK_DESTROY(_frame)                                   \
        do {                                                        \
                ((call_frame_t *)_frame)->local = NULL;             \
                STACK_DESTROY (((call_frame_t *)_frame)->root);     \
        } while (0)

#define SVS_CHECK_VALID_SNAPSHOT_HANDLE(fs, this)                       \
        do {                                                            \
                svs_private_t *_private = NULL;                         \
                _private = this->private;                               \
                int  i = 0;                                             \
                gf_boolean_t found = _gf_false;                         \
                LOCK (&_private->snaplist_lock);                        \
                {                                                       \
                        for (i = 0; i < _private->num_snaps; i++) {     \
                                if (_private->dirents->fs && fs &&      \
                                    _private->dirents->fs == fs) {      \
                                        found = _gf_true;               \
                                        break;                          \
                                }                                       \
                        }                                               \
                }                                                       \
                UNLOCK (&_private->snaplist_lock);                      \
                                                                        \
                if (!found)                                             \
                        fs = NULL;                                      \
        } while (0)

#define SVS_GET_INODE_CTX_INFO(inode_ctx, fs, object, this, loc, ret,   \
                               op_errno, label)                         \
        do {                                                            \
                fs = inode_ctx->fs;                                     \
                object = inode_ctx->object;                             \
                SVS_CHECK_VALID_SNAPSHOT_HANDLE (fs, this);             \
                if (!fs)                                                \
                        object = NULL;                                  \
                                                                        \
                if (!fs || !object) {                                   \
                        int32_t tmp = -1;                               \
                        char    tmp_uuid[64];                           \
                                                                        \
                        tmp = svs_get_handle (this, loc, inode_ctx,     \
                                              &op_errno);               \
                        if (tmp) {                                      \
                                gf_log (this->name, GF_LOG_ERROR,       \
                                        "failed to get the handle for %s " \
                                        "(gfid: %s)", loc->path,        \
                                        uuid_utoa_r (loc->inode->gfid,  \
                                                     tmp_uuid));        \
                                ret = -1;                               \
                                goto label;                             \
                        }                                               \
                                                                        \
                        fs = inode_ctx->fs;                             \
                        object = inode_ctx->object;                     \
                }                                                       \
        } while(0);

#define SVS_STRDUP(dst, src)                                            \
        do {                                                            \
                if (dst && strcmp (src, dst)) {                         \
                        GF_FREE (dst);                                  \
                        dst = NULL;                                     \
                }                                                       \
                                                                        \
                if (!dst)                                               \
                        dst = gf_strdup (src);                          \
        } while (0)

int
svs_mgmt_submit_request (void *req, call_frame_t *frame,
                         glusterfs_ctx_t *ctx,
                         rpc_clnt_prog_t *prog, int procnum,
                         fop_cbk_fn_t cbkfn, xdrproc_t xdrproc);

int
svs_get_snapshot_list (xlator_t *this);

int
mgmt_get_snapinfo_cbk (struct rpc_req *req, struct iovec *iov,
                       int count, void *myframe);

typedef enum {
        SNAP_VIEW_ENTRY_POINT_INODE = 0,
        SNAP_VIEW_SNAPSHOT_INODE,
        SNAP_VIEW_VIRTUAL_INODE
} inode_type_t;

struct svs_inode {
        glfs_t *fs;
        glfs_object_t *object;
        inode_type_t type;

        /* used only for entry point directory where gfid of the directory
           from where the entry point was entered is saved.
        */
        uuid_t pargfid;

        /* This is used to generate gfid for all sub files/dirs under this
         * snapshot
         */
        char *snapname;
        struct iatt buf;
};
typedef struct svs_inode svs_inode_t;

struct svs_fd {
        glfs_fd_t *fd;
};
typedef struct svs_fd svs_fd_t;

struct snap_dirent {
        char name[NAME_MAX];
        char uuid[UUID_CANONICAL_FORM_LEN + 1];
        char snap_volname[NAME_MAX];
        glfs_t *fs;
};
typedef struct snap_dirent snap_dirent_t;

struct svs_private {
        snap_dirent_t           *dirents;
        int                     num_snaps;
        char                    *volname;
        struct list_head        snaplist;
        gf_lock_t               snaplist_lock;
        struct rpc_clnt         *rpc;
};
typedef struct svs_private svs_private_t;

int
__svs_inode_ctx_set (xlator_t *this, inode_t *inode, svs_inode_t *svs_inode);

svs_inode_t *
__svs_inode_ctx_get (xlator_t *this, inode_t *inode);

svs_inode_t *
svs_inode_ctx_get (xlator_t *this, inode_t *inode);

int32_t
svs_inode_ctx_set (xlator_t *this, inode_t *inode, svs_inode_t *svs_inode);

svs_inode_t *
svs_inode_ctx_get_or_new (xlator_t *this, inode_t *inode);

int
__svs_fd_ctx_set (xlator_t *this, fd_t *fd, svs_fd_t *svs_fd);

svs_fd_t *
__svs_fd_ctx_get (xlator_t *this, fd_t *fd);

svs_fd_t *
svs_fd_ctx_get (xlator_t *this, fd_t *fd);

int32_t
svs_fd_ctx_set (xlator_t *this, fd_t *fd, svs_fd_t *svs_fd);

svs_fd_t *
__svs_fd_ctx_get_or_new (xlator_t *this, fd_t *fd);

svs_fd_t *
svs_fd_ctx_get_or_new (xlator_t *this, fd_t *fd);

void
svs_uuid_generate (uuid_t gfid, char *snapname, uuid_t origin_gfid);

void
svs_fill_ino_from_gfid (struct iatt *buf);

void
svs_iatt_fill (uuid_t gfid, struct iatt *buf);

snap_dirent_t *
svs_get_latest_snap_entry (xlator_t *this);

glfs_t *
svs_get_latest_snapshot (xlator_t *this);

glfs_t *
svs_initialise_snapshot_volume (xlator_t *this, const char *name,
                                int32_t *op_errno);

glfs_t *
__svs_initialise_snapshot_volume (xlator_t *this, const char *name,
                                  int32_t *op_errno);

snap_dirent_t *
__svs_get_snap_dirent (xlator_t *this, const char *name);

int
svs_mgmt_init (xlator_t *this);

int32_t
svs_get_handle (xlator_t *this, loc_t *loc, svs_inode_t *inode_ctx,
                int32_t *op_errno);

#endif /* __SNAP_VIEW_H__ */