text: /* Copyright (C) 2019 MariaDB Corporation Ab
  
     This program is free software; you can redistribute it and/or modify
     it under the terms of the GNU General Public License as published by
     the Free Software Foundation; version 2 of the License.
  
     This program is distributed in the hope that it will be useful,
     but WITHOUT ANY WARRANTY; without even the implied warranty of
     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
     GNU General Public License for more details.
  
     You should have received a copy of the GNU General Public License
     along with this program; if not, write to the Free Software Foundation,
     Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02111-1301 USA */
  
  /*
    Interface function used by S3 storage engine and aria_copy_for_s3
  */
  
  #include "maria_def.h"
  #include "s3_func.h"
  #include <aria_backup.h>
  #include <mysqld_error.h>
  #include <sql_const.h>
  #include <mysys_err.h>
  #include <mysql_com.h>
  #include <zlib.h>
  
  /* number of '.' to print during a copy in verbose mode */
  #define DISPLAY_WITH 79
  
  static void convert_index_to_s3_format(uchar *header, ulong block_size,
                                         int compression);
  static void convert_index_to_disk_format(uchar *header);
  static void convert_frm_to_s3_format(uchar *header);
  static void convert_frm_to_disk_format(uchar *header);
  static int s3_read_file_from_disk(const char *filename, uchar **to,
                                    size_t *to_size, my_bool print_error);
  
  /* Used by ha_s3.cc and tools to define different protocol options */
  
  static const char *protocol_types[]= {"Auto", "Original", "Amazon", NullS};
  TYPELIB s3_protocol_typelib= {array_elements(protocol_types)-1,"",
                                protocol_types, NULL};
  
  /******************************************************************************
   Allocations handler for libmarias3
   To be removed when we do the init allocation in mysqld.cc
  ******************************************************************************/
  
  static void *s3_wrap_malloc(size_t size)
  {
    return my_malloc(PSI_NOT_INSTRUMENTED, size, MYF(MY_WME));
  }
  
  static void *s3_wrap_calloc(size_t nmemb, size_t size)
  {
    return my_malloc(PSI_NOT_INSTRUMENTED, nmemb * size,
                     MYF(MY_WME | MY_ZEROFILL));
  }
  
  static void *s3_wrap_realloc(void *ptr, size_t size)
  {
    return my_realloc(PSI_NOT_INSTRUMENTED, ptr, size,
                      MYF(MY_WME | MY_ALLOW_ZERO_PTR));
  }
  
  static char *s3_wrap_strdup(const char *str)
  {
    return my_strdup(PSI_NOT_INSTRUMENTED, str, MYF(MY_WME));
  }
  
  static void s3_wrap_free(void *ptr)
  {
    if (ptr)                                      /* Avoid tracing of null */
      my_free(ptr);
  }
  
  void s3_init_library()
  {
    ms3_library_init_malloc(s3_wrap_malloc, s3_wrap_free, s3_wrap_realloc,
                            s3_wrap_strdup, s3_wrap_calloc);
  }
  
  void s3_deinit_library()
  {
    ms3_library_deinit();
  }
  
  /******************************************************************************
   Functions on S3_INFO and S3_BLOCK
  ******************************************************************************/
  
  /*
    Free memory allocated by s3_get_object
  */
  
  void s3_free(S3_BLOCK *data)
  {
    my_free(data->alloc_ptr);
    data->alloc_ptr= 0;
  }
  
  
  /*
    Copy a S3_INFO structure
  */
  
  S3_INFO *s3_info_copy(S3_INFO *old)
  {
    S3_INFO *to, tmp;
  
    /* Copy lengths */
    memcpy(&tmp, old, sizeof(tmp));
    /* Allocate new buffers */
    if (!my_multi_malloc(PSI_NOT_INSTRUMENTED, MY_WME, &to, sizeof(S3_INFO),
                         &tmp.access_key.str, old->access_key.length+1,
                         &tmp.secret_key.str, old->secret_key.length+1,
                         &tmp.region.str,     old->region.length+1,
                         &tmp.bucket.str,     old->bucket.length+1,
                         &tmp.database.str,   old->database.length+1,
                         &tmp.table.str,      old->table.length+1,
                         &tmp.base_table.str, old->base_table.length+1,
                         NullS))
      return 0;
    /* Copy lengths and new pointers to to */
    memcpy(to, &tmp, sizeof(tmp));
    /* Copy data */
    strmov((char*) to->access_key.str, old->access_key.str);
    strmov((char*) to->secret_key.str, old->secret_key.str);
    strmov((char*) to->region.str,     old->region.str);
    strmov((char*) to->bucket.str,     old->bucket.str);
    /* Database may not be null terminated */
    strmake((char*) to->database.str,  old->database.str, old->database.length);
    strmov((char*) to->table.str,      old->table.str);
    strmov((char*) to->base_table.str, old->base_table.str);
    return to;
  }
  
  /**
     Open a connection to s3
  */
  
  ms3_st *s3_open_connection(S3_INFO *s3)
  {
    ms3_st *s3_client;
    if (!(s3_client= ms3_init(s3->access_key.str,
                              s3->secret_key.str,
                              s3->region.str,
                              s3->host_name.str)))
    {
      my_printf_error(HA_ERR_NO_SUCH_TABLE,
                      "Can't open connection to S3, error: %d %s", MYF(0),
                      errno, ms3_error(errno));
      my_errno= HA_ERR_NO_SUCH_TABLE;
    }
    if (s3->protocol_version)
      ms3_set_option(s3_client, MS3_OPT_FORCE_PROTOCOL_VERSION,
                     &s3->protocol_version);
    if (s3->port)
      ms3_set_option(s3_client, MS3_OPT_PORT_NUMBER, &s3->port);
  
    if (s3->use_http)
      ms3_set_option(s3_client, MS3_OPT_USE_HTTP, NULL);
  
    return s3_client;
  }
  
  /**
     close a connection to s3
  */
  
  void s3_deinit(ms3_st *s3_client)
  {
    DBUG_PUSH("");                                /* Avoid tracing free calls */
    ms3_deinit(s3_client);
    DBUG_POP();
  }
  
  
  /******************************************************************************
   High level functions to copy tables to and from S3
  ******************************************************************************/
  
  /**
     Create suffix for object name
     @param to_end end of suffix (from previous call or 000000 at start)
  
     The suffix is a 6 length '0' prefixed number. If the number
     gets longer than 6, then it's extended to 7 and more digits.
  */
  
  static void fix_suffix(char *to_end, ulong nr)
  {
    char buff[11];
    uint length= (uint) (int10_to_str(nr, buff, 10) - buff);
    set_if_smaller(length, 6);
    strmov(to_end - length, buff);
  }
  
  /**
     Copy file to 'aws_path' in blocks of block_size
  
     @return 0   ok
     @return 1   error. Error message is printed to stderr
  
     Notes:
     file is always closed before return
  */
  
  static my_bool copy_from_file(ms3_st *s3_client, const char *aws_bucket,
                                char *aws_path,
                                File file, my_off_t start, my_off_t file_end,
                                uchar *block, size_t block_size,
                                my_bool compression, my_bool display)
  {
    my_off_t pos;
    char *path_end= strend(aws_path);
    ulong bnr;
    my_bool print_done= 0;
    size_t length;
  
    for (pos= start, bnr=1 ; pos < file_end ; pos+= length, bnr++)
    {
      if ((length= my_pread(file, block, block_size, pos, MYF(MY_WME))) ==
          MY_FILE_ERROR)
        goto err;
      if (length == 0)
      {
        my_error(EE_EOFERR, MYF(0), my_filename(file), my_errno);
        goto err;
      }
  
      fix_suffix(path_end, bnr);
      if (s3_put_object(s3_client, aws_bucket, aws_path, block, length,
                        compression))
        goto err;
  
      /* Write up to DISPLAY_WITH number of '.' during copy */
      if (display &&
          ((pos + block_size) * DISPLAY_WITH / file_end) >
          (pos * DISPLAY_WITH/file_end))
      {
        fputc('.', stdout); fflush(stdout);
        print_done= 1;
      }
    }
    if (print_done)
    {
      fputc('\n', stdout); fflush(stdout);
    }
    my_close(file, MYF(MY_WME));
    return 0;
  
  err:
    my_close(file, MYF(MY_WME));
    if (print_done)
    {
      fputc('\n', stdout); fflush(stdout);
    }
    return 1;
  }
  
  
  /**
     Copy an Aria table to S3
     @param s3_client    connection to S3
     @param aws_bucket   Aws bucket
     @param path         Path for Aria table (can be temp table)
     @param database     database name
     @param table_name   table name
     @param block_size   Block size in s3. If 0 then use block size
                         and compression as specified in the .MAI file as
                         specified as part of open.
     @param compression  Compression algorithm (0 = none, 1 = zip)
                         If block size is 0 then use .MAI file.
     @return 0  ok
     @return 1  error
  
     The table will be copied in S3 into the following locations:
  
     frm file (for discovery):
     aws_bucket/database/table/frm
  
     First index block (contains description if the Aria file):
     aws_bucket/database/table/aria
  
     Rest of the index file:
     aws_bucket/database/table/index/block_number
  
     Data file:
     aws_bucket/database/table/data/block_number
  
     block_number is 6 digits decimal number, prefixed with 0
     (Can be larger than 6 numbers, the prefix is just for nice output)
  
     frm and base blocks are small (just the needed data).
     index and blocks are of size 's3_block_size'
  
     If compression is used, then original block size is s3_block_size
     but the stored block will be the size of the compressed block.
  */
  
  int aria_copy_to_s3(ms3_st *s3_client, const char *aws_bucket,
                      const char *path,
                      const char *database, const char *table_name,
                      ulong block_size, my_bool compression,
                      my_bool force, my_bool display, my_bool copy_frm)
  {
    ARIA_TABLE_CAPABILITIES cap;
    char aws_path[FN_REFLEN+100];
    char filename[FN_REFLEN];
    char *aws_path_end, *end;
    uchar *alloc_block= 0, *block;
    ms3_status_st status;
    File file= -1;
    my_off_t file_size;
    size_t frm_length;
    int error;
    my_bool frm_created= 0;
    DBUG_ENTER("aria_copy_to_s3");
    DBUG_PRINT("enter",("from: %s  database: %s  table: %s",
                        path, database, table_name));
  
    aws_path_end= strxmov(aws_path, database, "/", table_name, NullS);
    strmov(aws_path_end, "/aria");
  
    if (!ms3_status(s3_client, aws_bucket, aws_path, &status))
    {
      if (!force)
      {
        my_printf_error(EE_CANTCREATEFILE, "File %s exists in s3", MYF(0),
                        aws_path);
        DBUG_RETURN(EE_CANTCREATEFILE);
      }
      if ((error= aria_delete_from_s3(s3_client, aws_bucket, database,
                                      table_name, display)))
        DBUG_RETURN(error);
    }
  
    if (copy_frm)
    {
      /*
        Copy frm file if it exists
        We do this first to ensure that .frm always exists. This is needed to
        ensure that discovery of the table will work.
      */
      fn_format(filename, path, "", ".frm", MY_REPLACE_EXT);
      if (!s3_read_file_from_disk(filename, &alloc_block, &frm_length,0))
      {
        if (display)
          printf("Copying frm file %s\n", filename);
  
        end= strmov(aws_path_end,"/frm");
        convert_frm_to_s3_format(alloc_block);
  
        /* Note that frm is not compressed! */
        if (s3_put_object(s3_client, aws_bucket, aws_path, alloc_block, frm_length,
                          0))
          goto err;
  
        frm_created= 1;
        my_free(alloc_block);
        alloc_block= 0;
      }
    }
  
    if (display)
      printf("Copying aria table: %s.%s to s3\n", database, table_name);
  
    /* Index file name */
    fn_format(filename, path, "", ".MAI", MY_REPLACE_EXT);
    if ((file= my_open(filename,
                       O_RDONLY | O_SHARE | O_NOFOLLOW | O_CLOEXEC,
                       MYF(MY_WME))) < 0)
      DBUG_RETURN(1);
    if ((error= aria_get_capabilities(file, &cap)))
    {
      fprintf(stderr, "Got error %d when reading Aria header from %s\n",
              error, path);
      goto err;
    }
    if (cap.transactional || cap.data_file_type != BLOCK_RECORD ||
        cap.encrypted)
    {
      fprintf(stderr,
              "Aria table %s doesn't match criteria to be copied to S3.\n"
              "It should be non-transactional and should have row_format page\n",
              path);
      goto err;
    }
    /*
      If block size is not specified, use the values specified as part of
      create
    */
    if (block_size == 0)
    {
      block_size=  cap.s3_block_size;
      compression= cap.compression;
    }
  
    /* Align S3_BLOCK size with table block size */
    block_size= (block_size/cap.block_size)*cap.block_size;
  
    /* Allocate block for data + flag for compress header */
    if (!(alloc_block= (uchar*) my_malloc(PSI_NOT_INSTRUMENTED,
                                          block_size+ALIGN_SIZE(1),
                                          MYF(MY_WME))))
      goto err;
    /* Read/write data here, but with prefix space for compression flag */
    block= alloc_block+ ALIGN_SIZE(1);
  
    if (my_pread(file, block, cap.header_size, 0, MYF(MY_WME | MY_FNABP)))
      goto err;
  
    strmov(aws_path_end, "/aria");
  
    if (display)
      printf("Creating aria table information %s\n", aws_path);
  
    convert_index_to_s3_format(block, block_size, compression);
  
    /*
      The first page is not compressed as we need it to know if the rest is
      compressed
    */
    if (s3_put_object(s3_client, aws_bucket, aws_path, block, cap.header_size,
                      0 /* no compression */ ))
      goto err;
  
    file_size= my_seek(file, 0L, MY_SEEK_END, MYF(0));
  
    end= strmov(aws_path_end,"/index");
  
    if (display)
      printf("Copying index information %s\n", aws_path);
  
    /* The 000000 will be update with block number by fix_suffix() */
    end= strmov(end, "/000000");
  
    error= copy_from_file(s3_client, aws_bucket, aws_path, file, cap.header_size,
                          file_size, block, block_size, compression, display);
    file= -1;
    if (error)
      goto err;
  
    /* Copy data file */
    fn_format(filename, path, "", ".MAD", MY_REPLACE_EXT);
    if ((file= my_open(filename,
                             O_RDONLY | O_SHARE | O_NOFOLLOW | O_CLOEXEC,
                             MYF(MY_WME))) < 0)
      DBUG_RETURN(1);
  
    file_size= my_seek(file, 0L, MY_SEEK_END, MYF(0));
  
    end= strmov(aws_path_end, "/data");
  
    if (display)
      printf("Copying data information %s\n", aws_path);
  
    /* The 000000 will be update with block number by fix_suffix() */
    end= strmov(end, "/000000");
  
    error= copy_from_file(s3_client, aws_bucket, aws_path, file, 0, file_size,
                          block, block_size, compression, display);
    file= -1;
    if (error)
      goto err;
  
    my_free(alloc_block);
    DBUG_RETURN(0);
  
  err:
    if (frm_created)
    {
      end= strmov(aws_path_end,"/frm");
      (void) s3_delete_object(s3_client, aws_bucket, aws_path, MYF(ME_NOTE));
    }
    if (file >= 0)
      my_close(file, MYF(0));
    my_free(alloc_block);
    DBUG_RETURN(1);
  }
  
  
  /**
     Copy file to 'aws_path' in blocks of block_size
  
     @return 0   ok
     @return 1   error. Error message is printed to stderr
  
     Notes:
     file is always closed before return
  */
  
  static my_bool copy_to_file(ms3_st *s3_client, const char *aws_bucket,
                              char *aws_path, File file, my_off_t start,
                              my_off_t file_end, my_bool compression,
                              my_bool display)
  {
    my_off_t pos;
    char *path_end= strend(aws_path);
    size_t error;
    ulong bnr;
    my_bool print_done= 0;
    S3_BLOCK block;
    DBUG_ENTER("copy_to_file");
    DBUG_PRINT("enter", ("path: %s  start: %llu  end: %llu",
                         aws_path, (ulonglong) start, (ulonglong) file_end));
  
    for (pos= start, bnr=1 ; pos < file_end ; pos+= block.length, bnr++)
    {
      fix_suffix(path_end, bnr);
      if (s3_get_object(s3_client, aws_bucket, aws_path, &block, compression, 1))
        goto err;
  
      error= my_write(file, block.str, block.length, MYF(MY_WME | MY_FNABP));
      s3_free(&block);
      if (error == MY_FILE_ERROR)
        goto err;
  
      /* Write up to DISPLAY_WITH number of '.' during copy */
      if (display &&
          ((pos + block.length) * DISPLAY_WITH /file_end) >
          (pos * DISPLAY_WITH/file_end))
      {
        fputc('.', stdout); fflush(stdout);
        print_done= 1;
      }
    }
    if (print_done)
    {
      fputc('\n', stdout); fflush(stdout);
    }
    my_close(file, MYF(MY_WME));
    DBUG_RETURN(0);
  
  err:
    my_close(file, MYF(MY_WME));
    if (print_done)
    {
      fputc('\n', stdout); fflush(stdout);
    }
    DBUG_RETURN(1);
  }
  
  
  /**
     Copy a table from S3 to current directory
  */
  
  int aria_copy_from_s3(ms3_st *s3_client, const char *aws_bucket,
                        const char *path, const char *database,
                        my_bool compression, my_bool force, my_bool display)
  
  {
    MARIA_STATE_INFO state;
    MY_STAT stat_info;
    char table_name[FN_REFLEN], aws_path[FN_REFLEN+100];
    char filename[FN_REFLEN];
    char *aws_path_end, *end;
    File file= -1;
    S3_BLOCK block;
    my_off_t index_file_size, data_file_size;
    uint offset;
    int error;
    DBUG_ENTER("aria_copy_from_s3");
  
    /* Check if index file exists */
    fn_format(filename, path, "", ".MAI", MY_REPLACE_EXT);
    if (!force && my_stat(filename, &stat_info, MYF(0)))
    {
      my_printf_error(EE_CANTCREATEFILE, "Table %s already exists on disk",
                      MYF(0), filename);
      DBUG_RETURN(EE_CANTCREATEFILE);
    }
  
    fn_format(table_name, path, "", "", MY_REPLACE_DIR | MY_REPLACE_EXT);
    block.str= 0;
  
    aws_path_end= strxmov(aws_path, database, "/", table_name, NullS);
    strmov(aws_path_end, "/aria");
  
    if (s3_get_object(s3_client, aws_bucket, aws_path, &block, 0, 0))
    {
      my_printf_error(EE_FILENOTFOUND, "File %s/%s doesn't exist in s3", MYF(0),
                      database,filename);
      goto err;
    }
    if (block.length < MARIA_STATE_INFO_SIZE)
    {
      fprintf(stderr, "Wrong block length for first block: %lu\n",
              (ulong) block.length);
      goto err_with_free;
    }
  
    if (display)
      printf("Copying aria table: %s.%s from s3\n", database, table_name);
  
    /* For offset positions, check _ma_state_info_readlength() */
    offset= sizeof(state.header) + 4+ LSN_STORE_SIZE*3 + 8*5;
    index_file_size= mi_sizekorr(block.str + offset);
    data_file_size=  mi_sizekorr(block.str + offset+8);
  
    if ((file= my_create(filename, 0,
                         O_WRONLY | O_TRUNC | O_NOFOLLOW, MYF(MY_WME))) < 0)
      goto err_with_free;
  
    convert_index_to_disk_format(block.str);
  
    if (my_write(file, block.str, block.length, MYF(MY_WME | MY_FNABP)))
      goto err_with_free;
  
    if (display)
      printf("Copying index information %s\n", aws_path);
  
    end= strmov(aws_path_end,"/index/000000");
  
    error= copy_to_file(s3_client, aws_bucket, aws_path, file, block.length,
                        index_file_size, compression, display);
    file= -1;
    if (error)
      goto err_with_free;
  
    /* Copy data file */
    fn_format(filename, path, "", ".MAD", MY_REPLACE_EXT);
    if ((file= my_create(filename, 0,
                         O_WRONLY | O_TRUNC | O_NOFOLLOW, MYF(MY_WME))) < 0)
      DBUG_RETURN(1);
  
    end= strmov(aws_path_end, "/data");
  
    if (display)
      printf("Copying data information %s\n", aws_path);
  
    /* The 000000 will be update with block number by fix_suffix() */
    strmov(end, "/000000");
  
    error= copy_to_file(s3_client, aws_bucket, aws_path, file, 0, data_file_size,
                        compression, display);
    file= -1;
    s3_free(&block);
    block.str= 0;
    if (error)
      goto err;
  
    /* Copy frm file if it exists */
    strmov(aws_path_end, "/frm");
    if (!s3_get_object(s3_client, aws_bucket, aws_path, &block, 0, 0))
    {
      fn_format(filename, path, "", ".frm", MY_REPLACE_EXT);
      if ((file= my_create(filename, 0,
                           O_WRONLY | O_SHARE | O_NOFOLLOW | O_CLOEXEC,
                           MYF(0))) >= 0)
      {
        if (display)
          printf("Copying frm file %s\n", filename);
  
        convert_frm_to_disk_format(block.str);
  
        if (my_write(file, block.str, block.length, MYF(MY_WME | MY_FNABP)))
          goto err_with_free;
      }
      s3_free(&block);
      my_close(file, MYF(MY_WME));
      file= -1;
    }
  
    DBUG_RETURN(0);
  
  err_with_free:
    s3_free(&block);
  err:
    if (file >= 0)
      my_close(file, MYF(0));
    DBUG_RETURN(1);
  }
  
  
  /**
     Drop all files related to a table from S3
  */
  
  int aria_delete_from_s3(ms3_st *s3_client, const char *aws_bucket,
                          const char *database, const char *table,
                          my_bool display)
  {
    ms3_status_st status;
    char aws_path[FN_REFLEN+100];
    char *aws_path_end;
    int error;
    DBUG_ENTER("aria_delete_from_s3");
  
    aws_path_end= strxmov(aws_path, database, "/", table, NullS);
    strmov(aws_path_end, "/aria");
  
    /* Check if either /aria or /frm exists */
  
    if (ms3_status(s3_client, aws_bucket, aws_path, &status))
    {
      strmov(aws_path_end, "/frm");
      if (ms3_status(s3_client, aws_bucket, aws_path, &status))
      {
        my_printf_error(HA_ERR_NO_SUCH_TABLE,
                        "Table %s.%s doesn't exist in s3", MYF(0),
                        database, table);
        my_errno= HA_ERR_NO_SUCH_TABLE;
        DBUG_RETURN(HA_ERR_NO_SUCH_TABLE);
      }
    }
  
    if (display)
      printf("Delete of aria table: %s.%s\n", database, table);
  
    strmov(aws_path_end,"/index");
  
    if (display)
      printf("Delete of index information %s\n", aws_path);
  
    error= s3_delete_directory(s3_client, aws_bucket, aws_path);
  
    strmov(aws_path_end,"/data");
    if (display)
      printf("Delete of data information %s\n", aws_path);
  
    error|= s3_delete_directory(s3_client, aws_bucket, aws_path);
  
    if (display)
      printf("Delete of base information and frm\n");
  
    strmov(aws_path_end,"/aria");
    if (s3_delete_object(s3_client, aws_bucket, aws_path, MYF(MY_WME)))
      error= 1;
  
    /*
      Delete .frm last as this is used by discovery to check if a s3 table
      exists
    */
    strmov(aws_path_end,"/frm");
    /* Ignore error if .frm file doesn't exist */
    s3_delete_object(s3_client, aws_bucket, aws_path, MYF(ME_NOTE));
  
    DBUG_RETURN(error);
  }
  
  
  /**
    Rename a table in s3
  */
  
  int aria_rename_s3(ms3_st *s3_client, const char *aws_bucket,
                     const char *from_database, const char *from_table,
                     const char *to_database, const char *to_table,
                     my_bool rename_frm)
  {
    ms3_status_st status;
    char to_aws_path[FN_REFLEN+100], from_aws_path[FN_REFLEN+100];
    char *to_aws_path_end, *from_aws_path_end;
    int error;
    DBUG_ENTER("aria_rename_s3");
  
    from_aws_path_end= strxmov(from_aws_path, from_database, "/", from_table,
                               NullS);
    to_aws_path_end= strxmov(to_aws_path, to_database, "/", to_table, NullS);
    strmov(from_aws_path_end, "/aria");
  
    if (ms3_status(s3_client, aws_bucket, from_aws_path, &status))
    {
      my_printf_error(HA_ERR_NO_SUCH_TABLE,
                      "Table %s.%s doesn't exist in s3", MYF(0), from_database,
                      from_table);
      my_errno= HA_ERR_NO_SUCH_TABLE;
      DBUG_RETURN(HA_ERR_NO_SUCH_TABLE);
    }
  
    strmov(from_aws_path_end,"/index");
    strmov(to_aws_path_end,"/index");
  
    error= s3_rename_directory(s3_client, aws_bucket, from_aws_path, to_aws_path,
                               MYF(MY_WME));
  
    strmov(from_aws_path_end,"/data");
    strmov(to_aws_path_end,"/data");
  
    error|= s3_rename_directory(s3_client, aws_bucket, from_aws_path,
                                to_aws_path, MYF(MY_WME));
  
    if (rename_frm) {
      strmov(from_aws_path_end, "/frm");
      strmov(to_aws_path_end, "/frm");
  
      s3_rename_object(s3_client, aws_bucket, from_aws_path, to_aws_path,
                       MYF(MY_WME));
    }
  
    strmov(from_aws_path_end,"/aria");
    strmov(to_aws_path_end,"/aria");
    if (s3_rename_object(s3_client, aws_bucket, from_aws_path, to_aws_path,
                         MYF(MY_WME)))
      error= 1;
    DBUG_RETURN(error);
  }
  
  /**
     Copy all partition files related to a table from S3 (.frm and .par)
  
     @param s3_client   s3 client connection
     @param aws_bucket  bucket to use
     @param path        The path to the partitioned table files (no extension)
     @param old_path    In some cases the partioned files are not yet renamed.
                        This points to the temporary files that will later
                        be renamed to the partioned table
     @param database    Database for the partitioned table
     @param database    table name for the partitioned table
  */
  
  int partition_copy_to_s3(ms3_st *s3_client, const char *aws_bucket,
                           const char *path, const char *old_path,
                           const char *database, const char *table_name)
  {
    char aws_path[FN_REFLEN+100];
    char filename[FN_REFLEN];
    char *aws_path_end;
    uchar *alloc_block= 0;
    ms3_status_st status;
    size_t frm_length;
    int error;
    DBUG_ENTER("partition_copy_to_s3");
    DBUG_PRINT("enter",("from: %s  database: %s  table: %s",
                        path, database, table_name));
  
    if (!old_path)
      old_path= path;
  
    aws_path_end= strxmov(aws_path, database, "/", table_name, "/", NullS);
    strmov(aws_path_end, "frm");
    fn_format(filename, old_path, "", ".frm", MY_REPLACE_EXT);
  
    /* Just to be safe, delete any conflicting object */
    if (!ms3_status(s3_client, aws_bucket, aws_path, &status))
    {
      if ((error= s3_delete_object(s3_client, aws_bucket, aws_path,
                                   MYF(ME_FATAL))))
        DBUG_RETURN(error);
    }
    if ((error= s3_read_file_from_disk(filename, &alloc_block, &frm_length, 0)))
    {
      /*
        In case of ADD PARTITION PARTITON the .frm file is already renamed.
        Copy the renamed file if it exists.
      */
      fn_format(filename, path, "", ".frm", MY_REPLACE_EXT);
      if ((error= s3_read_file_from_disk(filename, &alloc_block, &frm_length,
                                         1)))
        goto err;
    }
    if ((error= s3_put_object(s3_client, aws_bucket, aws_path, alloc_block,
                              frm_length, 0)))
      goto err;
  
    /*
      Note that because ha_partiton::rename_table() is called before
      this function, the .par table already has it's final name!
    */
    fn_format(filename, path, "", ".par", MY_REPLACE_EXT);
    strmov(aws_path_end, "par");
    if (!ms3_status(s3_client, aws_bucket, aws_path, &status))
    {
      if ((error= s3_delete_object(s3_client, aws_bucket, aws_path,
                                   MYF(ME_FATAL))))
        goto err;
    }
  
    my_free(alloc_block);
    alloc_block= 0;
    if ((error=s3_read_file_from_disk(filename, &alloc_block, &frm_length, 1)))
      goto err;
    if ((error= s3_put_object(s3_client, aws_bucket, aws_path, alloc_block,
                              frm_length, 0)))
    {
      /* Delete the .frm file created above */
      strmov(aws_path_end, "frm");
      (void) s3_delete_object(s3_client, aws_bucket, aws_path,
                              MYF(ME_FATAL));
      goto err;
    }
    error= 0;
  
  err:
    my_free(alloc_block);
    DBUG_RETURN(error);
  }
  
  
  /**
     Drop all partition files related to a table from S3
  */
  
  int partition_delete_from_s3(ms3_st *s3_client, const char *aws_bucket,
                               const char *database, const char *table,
                               myf error_flags)
  {
    char aws_path[FN_REFLEN+100];
    char *aws_path_end;
    int error=0, res;
    DBUG_ENTER("partition_delete_from_s3");
  
    aws_path_end= strxmov(aws_path, database, "/", table, NullS);
    strmov(aws_path_end, "/par");
  
    if ((res= s3_delete_object(s3_client, aws_bucket, aws_path, error_flags)))
      error= res;
    /*
      Delete .frm last as this is used by discovery to check if a s3 table
      exists
    */
    strmov(aws_path_end, "/frm");
    if ((res= s3_delete_object(s3_client, aws_bucket, aws_path, error_flags)))
      error= res;
  
    DBUG_RETURN(error);
  }
  
  /******************************************************************************
   Low level functions interfacing with libmarias3
  ******************************************************************************/
  
  /**
     Create an object for index or data information
  
     Note that if compression is used, the data may be overwritten and
     there must be COMPRESS_HEADER length of free space before the data!
  
  */
  
  int s3_put_object(ms3_st *s3_client, const char *aws_bucket,
                     const char *name, uchar *data, size_t length,
                     my_bool compression)
  {
    uint8_t error;
    const char *errmsg;
    DBUG_ENTER("s3_put_object");
    DBUG_PRINT("enter", ("name: %s", name));
  
    if (compression)
    {
      size_t comp_len;
  
      data[-COMPRESS_HEADER]= 0;                  // No compression
      if (!my_compress(data, &length, &comp_len))
        data[-COMPRESS_HEADER]= 1;                // Compressed package
      data-=   COMPRESS_HEADER;
      length+= COMPRESS_HEADER;
      int3store(data+1, comp_len);               // Original length or 0
    }
  
    if (likely(!(error= ms3_put(s3_client, aws_bucket, name, data, length))))
      DBUG_RETURN(0);
  
    if (!(errmsg= ms3_server_error(s3_client)))
      errmsg= ms3_error(error);
  
    my_printf_error(EE_WRITE, "Got error from put_object(%s): %d %s", MYF(0),
                    name, error, errmsg);
    DBUG_RETURN(EE_WRITE);
  }
  
  
  /**
     Read an object for index or data information
  
     @param print_error 0  Don't print error
     @param print_error 1  Print error that object doesn't exists
     @param print_error 2  Print error that table doesn't exists
  */
  
  int s3_get_object(ms3_st *s3_client, const char *aws_bucket,
                    const char *name, S3_BLOCK *block,
                    my_bool compression, int print_error)
  {
    uint8_t error;
    int result= 0;
    uchar *data;
    DBUG_ENTER("s3_get_object");
    DBUG_PRINT("enter", ("name: %s  compression: %d", name, compression));
  
    block->str= block->alloc_ptr= 0;
    if (likely(!(error= ms3_get(s3_client, aws_bucket, name,
                                (uint8_t**) &block->alloc_ptr,
                                &block->length))))
    {
      block->str= block->alloc_ptr;
      if (compression)
      {
        ulong length;
  
        /* If not compressed */
        if (!block->str[0])
        {
          block->length-= COMPRESS_HEADER;
          block->str+=    COMPRESS_HEADER;
  
          /* Simple check to ensure that it's a correct block */
          if (block->length % 1024)
          {
            s3_free(block);
            my_printf_error(HA_ERR_NOT_A_TABLE,
                            "Block '%s' is not compressed", MYF(0), name);
            DBUG_RETURN(HA_ERR_NOT_A_TABLE);
          }
          DBUG_RETURN(0);
        }
  
        if (((uchar*)block->str)[0] > 1)
        {
          s3_free(block);
          my_printf_error(HA_ERR_NOT_A_TABLE,
                          "Block '%s' is not compressed", MYF(0), name);
          DBUG_RETURN(HA_ERR_NOT_A_TABLE);
        }
  
        length= uint3korr(block->str+1);
  
        if (!(data= (uchar*) my_malloc(PSI_NOT_INSTRUMENTED,
                                       length, MYF(MY_WME | MY_THREAD_SPECIFIC))))
        {
          s3_free(block);
          DBUG_RETURN(EE_OUTOFMEMORY);
        }
        if (uncompress(data, &length, block->str + COMPRESS_HEADER,
                       block->length - COMPRESS_HEADER))
        {
          my_printf_error(ER_NET_UNCOMPRESS_ERROR,
                          "Got error uncompressing s3 packet", MYF(0));
          s3_free(block);
          my_free(data);
          DBUG_RETURN(ER_NET_UNCOMPRESS_ERROR);
        }
        s3_free(block);
        block->str= block->alloc_ptr= data;
        block->length= length;
      }
      DBUG_RETURN(0);
    }
  
    if (error == 9)
    {
      result= my_errno= (print_error == 1 ? EE_FILENOTFOUND :
                         HA_ERR_NO_SUCH_TABLE);
      if (print_error)
        my_printf_error(my_errno, "Expected object '%s' didn't exist",
                        MYF(0), name);
    }
    else
    {
      result= my_errno= EE_READ;
      if (print_error)
      {
        const char *errmsg;
        if (!(errmsg= ms3_server_error(s3_client)))
          errmsg= ms3_error(error);
  
        my_printf_error(EE_READ, "Got error from get_object(%s): %d %s", MYF(0),
                        name, error, errmsg);
      }
    }
    s3_free(block);
    DBUG_RETURN(result);
  }
  
  
  int s3_delete_object(ms3_st *s3_client, const char *aws_bucket,
                           const char *name, myf error_flags)
  {
    uint8_t error;
    int result= 0;
    DBUG_ENTER("s3_delete_object");
    DBUG_PRINT("enter", ("name: %s", name));
  
    if (likely(!(error= ms3_delete(s3_client, aws_bucket, name))))
      DBUG_RETURN(0);
  
    if (error_flags)
    {
      error_flags&= ~MY_WME;
      if (error == 9)
        my_printf_error(result= EE_FILENOTFOUND,
                        "Expected object '%s' didn't exist",
                        error_flags, name);
      else
      {
        const char *errmsg;
        if (!(errmsg= ms3_server_error(s3_client)))
          errmsg= ms3_error(error);
  
        my_printf_error(result= EE_READ,
                        "Got error from delete_object(%s): %d %s",
                        error_flags, name, error, errmsg);
      }
    }
    DBUG_RETURN(result);
  }
  
  
  /*
    Drop all files in a 'directory' in s3
  */
  
  int s3_delete_directory(ms3_st *s3_client, const char *aws_bucket,
                          const char *path)
  {
    ms3_list_st *list, *org_list= 0;
    my_bool error;
    DBUG_ENTER("delete_directory");
    DBUG_PRINT("enter", ("path: %s", path));
  
    if ((error= ms3_list(s3_client, aws_bucket, path, &org_list)))
    {
      const char *errmsg;
      if (!(errmsg= ms3_server_error(s3_client)))
        errmsg= ms3_error(error);
  
      my_printf_error(EE_FILENOTFOUND,
                      "Can't get list of files from %s. Error: %d %s", MYF(0),
                      path, error, errmsg);
      DBUG_RETURN(EE_FILENOTFOUND);
    }
  
    for (list= org_list ; list ; list= list->next)
      if (s3_delete_object(s3_client, aws_bucket, list->key, MYF(MY_WME)))
        error= 1;
    if (org_list)
      ms3_list_free(org_list);
    DBUG_RETURN(error);
  }
  
  
  my_bool s3_rename_object(ms3_st *s3_client, const char *aws_bucket,
                           const char *from_name, const char *to_name,
                           myf error_flags)
  {
    uint8_t error;
    DBUG_ENTER("s3_rename_object");
    DBUG_PRINT("enter", ("from: %s  to: %s", from_name, to_name));
  
    if (likely(!(error= ms3_move(s3_client,
                                 aws_bucket, from_name,
                                 aws_bucket, to_name))))
      DBUG_RETURN(FALSE);
  
    if (error_flags)
    {
      error_flags&= ~MY_WME;
      if (error == 9)
      {
        my_printf_error(EE_FILENOTFOUND, "Expected object '%s' didn't exist",
                        error_flags, from_name);
      }
      else
      {
        const char *errmsg;
        if (!(errmsg= ms3_server_error(s3_client)))
          errmsg= ms3_error(error);
  
        my_printf_error(EE_READ, "Got error from move_object(%s -> %s): %d %",
                        error_flags,
                        from_name, to_name, error, errmsg);
      }
    }
    DBUG_RETURN(TRUE);
  }
  
  
  int s3_rename_directory(ms3_st *s3_client, const char *aws_bucket,
                          const char *from_name, const char *to_name,
                          myf error_flags)
  {
    ms3_list_st *list, *org_list= 0;
    my_bool error= 0;
    char name[AWS_PATH_LENGTH], *end;
    DBUG_ENTER("s3_delete_directory");
  
    if ((error= ms3_list(s3_client, aws_bucket, from_name, &org_list)))
    {
      const char *errmsg;
      if (!(errmsg= ms3_server_error(s3_client)))
        errmsg= ms3_error(error);
  
      my_printf_error(EE_FILENOTFOUND,
                      "Can't get list of files from %s. Error: %d %s",
                      MYF(error_flags & ~MY_WME),
                      from_name, error, errmsg);
      DBUG_RETURN(EE_FILENOTFOUND);
    }
  
    end= strmov(name, to_name);
    for (list= org_list ; list ; list= list->next)
    {
      const char *sep= strrchr(list->key, '/');
      if (sep)                                    /* Safety */
      {
        strmake(end, sep, (sizeof(name) - (end-name) - 1));
        if (s3_rename_object(s3_client, aws_bucket, list->key, name,
                             error_flags))
          error= 1;
      }
    }
    if (org_list)
      ms3_list_free(org_list);
    DBUG_RETURN(error);
  }
  
  
  /******************************************************************************
   Converting index and frm files to from S3 storage engine
  ******************************************************************************/
  
  /**
    Change index information to be of type s3
  
    @param header      Copy of header in index file
    @param block_size  S3 block size
    @param compression Compression algorithm to use
  
    The position are from _ma_base_info_write()
  */
  
  static void convert_index_to_s3_format(uchar *header, ulong block_size,
                                         int compression)
  {
    MARIA_STATE_INFO state;
    uchar *base_pos;
    uint  base_offset;
  
    memcpy(state.header.file_version, header, sizeof(state.header));
    base_offset= mi_uint2korr(state.header.base_pos);
    base_pos= header + base_offset;
  
    base_pos[107]= (uchar) compression;
    mi_int3store(base_pos+119, block_size);
  }
  
  
  /**
     Change index information to be a normal disk based table
  */
  
  static void convert_index_to_disk_format(uchar *header)
  {
    MARIA_STATE_INFO state;
    uchar *base_pos;
    uint  base_offset;
  
    memcpy(state.header.file_version, header, sizeof(state.header));
    base_offset= mi_uint2korr(state.header.base_pos);
    base_pos= header + base_offset;
  
    base_pos[107]= 0;
    mi_int3store(base_pos+119, 0);
  }
  
  /**
    Change storage engine in the .frm file from Aria to s3
  
    For information about engine types, see legacy_db_type
  */
  
  static void convert_frm_to_s3_format(uchar *header)
  {
    DBUG_ASSERT(header[3] == 42 || header[3] == 41); /* Aria or S3 */
    header[3]= 41;                                   /* S3 */
  }
  
  /**
    Change storage engine in the .frm file from S3 to Aria
  
    For information about engine types, see legacy_db_type
  */
  
  static void convert_frm_to_disk_format(uchar *header)
  {
    DBUG_ASSERT(header[3] == 41);                 /* S3 */
    header[3]= 42;                                /* Aria */
  }
  
  
  /******************************************************************************
   Helper functions
  ******************************************************************************/
  
  /**
    Set database and table name from path
  
    s3->database and s3->table_name will be pointed into path
    Note that s3->database will not be null terminated!
  */
  
  my_bool set_database_and_table_from_path(S3_INFO *s3, const char *path)
  {
    size_t org_length= dirname_length(path);
    size_t length= 0;
  
    if (!org_length)
      return 1;
  
    s3->table.str= path+org_length;
    s3->table.length= strlen(s3->table.str);
    for (length= --org_length; length > 0 ; length --)
    {
      if (path[length-1] == FN_LIBCHAR || path[length-1] == '/')
        break;
  #ifdef FN_DEVCHAR
      if (path[length-1] == FN_DECVHAR)
        break;
  #endif
    }
    if (length &&
        (path[length] != FN_CURLIB || org_length - length != 1))
    {
      s3->database.str= path + length;
      s3->database.length= org_length - length;
      return 0;
    }
    return 1;                                     /* Can't find database */
  }
  
  
  /**
     Read frm from the disk
  */
  
  static int s3_read_file_from_disk(const char *filename, uchar **to,
                                    size_t *to_size, my_bool print_error)
  {
    File file;
    uchar *alloc_block;
    size_t file_size;
    int error;
  
    *to= 0;
    if ((file= my_open(filename,
                       O_RDONLY | O_SHARE | O_NOFOLLOW | O_CLOEXEC,
                       MYF(print_error ? MY_WME: 0))) < 0)
      return(my_errno);
  
    file_size= (size_t) my_seek(file, 0L, MY_SEEK_END, MYF(0));
    if (!(alloc_block= my_malloc(PSI_NOT_INSTRUMENTED, file_size, MYF(MY_WME))))
      goto err;
  
    if (my_pread(file, alloc_block, file_size, 0, MYF(MY_WME | MY_FNABP)))
      goto err;
  
    *to=      alloc_block;
    *to_size= file_size;
    my_close(file, MYF(0));
    return 0;
  
  err:
    error= my_errno;
    my_free(alloc_block);
    my_close(file, MYF(0));
    return error;
  }
  
  
  /**
     Get .frm or par from S3
  
     @return 0 ok
     @return 1 error
  */
  
  my_bool s3_get_def(ms3_st *s3_client, S3_INFO *s3_info, S3_BLOCK *block,
                     const char *ext)
  {
    char aws_path[AWS_PATH_LENGTH];
  
    strxnmov(aws_path, sizeof(aws_path)-1, s3_info->database.str, "/",
             s3_info->table.str, "/", ext, NullS);
  
    return s3_get_object(s3_client, s3_info->bucket.str, aws_path, block,
                         0, 0);
  }
  
  /**
     Check if .frm exits in S3
  
     @return 0 frm exists
     @return 1 error
  */
  
  my_bool s3_frm_exists(ms3_st *s3_client, S3_INFO *s3_info)
  {
    char aws_path[AWS_PATH_LENGTH];
    ms3_status_st status;
  
    strxnmov(aws_path, sizeof(aws_path)-1, s3_info->database.str, "/",
             s3_info->table.str, "/frm", NullS);
  
    return ms3_status(s3_client, s3_info->bucket.str, aws_path, &status);
  }
  
  
  /**
     Get version from frm file
  
     @param out        Store the table_version_here. It's of size MY_UUID_SIZE
     @param frm_image  Frm image
     @param frm_length size of image
  
     @return 0  Was able to read table version
     @return 1  Wrong information in frm file
  */
  
  #define FRM_HEADER_SIZE 64
  #define EXTRA2_TABLEDEF_VERSION 0
  
  static inline my_bool is_binary_frm_header(const uchar *head)
  {
    return head[0] == 254
        && head[1] == 1
        && head[2] >= FRM_VER
        && head[2] <= FRM_VER_CURRENT;
  }
  
  static my_bool get_tabledef_version_from_frm(char *out, const uchar *frm_image,
                                               size_t frm_length)
  {
    uint segment_len;
    const uchar *extra, *extra_end;
    if (!is_binary_frm_header(frm_image) || frm_length <= FRM_HEADER_SIZE)
      return 1;
  
    /* Length of the MariaDB extra2 segment in the form file. */
    segment_len= uint2korr(frm_image + 4);
    if (frm_length < FRM_HEADER_SIZE + segment_len)
      return 1;
  
    extra= frm_image + FRM_HEADER_SIZE;
    if (*extra == '/')   // old frm had '/' there
      return 1;
  
    extra_end= extra + segment_len;
    while (extra + 4 < extra_end)
    {
      uchar type= *extra++;
      size_t length= *extra++;
      if (!length)
      {
        length= uint2korr(extra);
        extra+= 2;
        if (length < 256)
          return 1;                               /* Something is wrong */
      }
      if (extra + length > extra_end)
        return 1;
      if (type == EXTRA2_TABLEDEF_VERSION)
      {
        if (length != MY_UUID_SIZE)
          return 1;
        memcpy(out, extra, length);
        return 0;                                 /* Found it */
      }
      extra+= length;
    }
    return 1;
  }
  
  
  /**
     Check if version in frm file matches what the server expects
  
     @return 0 table definitions matches
     @return 1 table definitions doesn't match
     @return 2 Can't find the frm version
     @return 3 Can't read the frm version
  */
  
  int s3_check_frm_version(ms3_st *s3_client, S3_INFO *s3_info)
  {
    my_bool res= 0;
    char aws_path[AWS_PATH_LENGTH];
    char uuid[MY_UUID_SIZE];
    S3_BLOCK block;
    DBUG_ENTER("s3_check_frm_version");
  
    strxnmov(aws_path, sizeof(aws_path)-1, s3_info->database.str, "/",
             s3_info->base_table.str, "/frm", NullS);
  
    if (s3_get_object(s3_client, s3_info->bucket.str, aws_path, &block, 0, 0))
    {
      DBUG_PRINT("exit", ("No object found"));
      DBUG_RETURN(2);                    /* Ignore check, use old frm */
    }
  
    if (get_tabledef_version_from_frm(uuid, (uchar*) block.str, block.length) ||
        s3_info->tabledef_version.length != MY_UUID_SIZE)
    {
      s3_free(&block);
      DBUG_PRINT("error", ("Wrong definition"));
      DBUG_RETURN(3);                                   /* Wrong definition */
    }
    /* res is set to 1 if versions numbers doesn't match */
    res= bcmp(s3_info->tabledef_version.str, uuid, MY_UUID_SIZE) != 0;
    s3_free(&block);
    if (res)
      DBUG_PRINT("error", ("Wrong table version"));
    else
      DBUG_PRINT("exit", ("Version strings matches"));
    DBUG_RETURN(res);
  }
  
  
  /******************************************************************************
   Reading blocks from index or data from S3
  ******************************************************************************/
  
  /*
    Read the index header (first page) from the index file
  
    In case of error, my_error() is called
  */
  
  my_bool read_index_header(ms3_st *client, S3_INFO *s3, S3_BLOCK *block)
  {
    char aws_path[AWS_PATH_LENGTH];
    DBUG_ENTER("read_index_header");
    strxnmov(aws_path, sizeof(aws_path)-1, s3->database.str, "/", s3->table.str,
             "/aria", NullS);
    DBUG_RETURN(s3_get_object(client, s3->bucket.str, aws_path, block, 0, 2));
  }
  
  
  #ifdef FOR_FUTURE_IF_NEEDED_FOR_DEBUGGING_WITHOUT_S3
  /**
     Read a big block from disk
  */
  
  my_bool s3_block_read(struct st_pagecache *pagecache,
                               PAGECACHE_IO_HOOK_ARGS *args,
                               struct st_pagecache_file *file,
                               LEX_STRING *data)
  {
    MARIA_SHARE *share= (MARIA_SHARE*) file->callback_data;
    my_bool datafile= file != &share->kfile;
  
    DBUG_ASSERT(file->big_block_size > 0);
    DBUG_ASSERT(((((my_off_t) args->pageno - file->head_blocks) <<
                  pagecache->shift) %
                 file->big_block_size) == 0);
  
    if (!(data->str= (char *) my_malloc(file->big_block_size, MYF(MY_WME))))
      return TRUE;
  
    data->length= mysql_file_pread(file->file,
                                   (unsigned char *)data->str,
                                   file->big_block_size,
                                   ((my_off_t) args->pageno << pagecache->shift),
                                   MYF(MY_WME));
    if (data->length == 0 || data->length == MY_FILE_ERROR)
    {
      if (data->length == 0)
      {
        LEX_STRING *file_name= (datafile ?
                                &share->data_file_name :
                                &share->index_file_name);
        my_error(EE_EOFERR, MYF(0), file_name->str, my_errno);
      }
      my_free(data->str);
      data->length= 0;
      data->str= 0;
      return TRUE;
    }
    return FALSE;
  }
  #endif
  
  
  /**
     Read a block from S3 to page cache
  */
  
  my_bool s3_block_read(struct st_pagecache *pagecache,
                        PAGECACHE_IO_HOOK_ARGS *args,
                        struct st_pagecache_file *file,
                        S3_BLOCK *block)
  {
    char aws_path[AWS_PATH_LENGTH];
    MARIA_SHARE *share= (MARIA_SHARE*) file->callback_data;
    my_bool datafile= file->file != share->kfile.file;
    MARIA_HA *info= (MARIA_HA*) my_thread_var->keycache_file;
    ms3_st *client= info->s3;
    const char *path_suffix= datafile ? "/data/" : "/index/";
    char *end;
    S3_INFO *s3= share->s3_path;
    ulong block_number;
    DBUG_ENTER("s3_block_read");
  
    DBUG_ASSERT(file->big_block_size > 0);
    DBUG_ASSERT(((((my_off_t) args->pageno - file->head_blocks) <<
                  pagecache->shift) %
                 file->big_block_size) == 0);
  
    block_number= (((args->pageno - file->head_blocks) << pagecache->shift) /
                   file->big_block_size) + 1;
  
    end= strxnmov(aws_path, sizeof(aws_path)-12, s3->database.str, "/",
                  s3->table.str, path_suffix, "000000", NullS);
    fix_suffix(end, block_number);
  
    DBUG_RETURN(s3_get_object(client, s3->bucket.str, aws_path, block,
                              share->base.compression_algorithm, 1));
  }
  
  /*
    Start file numbers from 1000 to more easily find bugs when the file number
    could be mistaken for a real file
  */
  static volatile int32 unique_file_number= 1000;
  
  int32 s3_unique_file_number()
  {
    return my_atomic_add32_explicit(&unique_file_number, 1,
                                    MY_MEMORY_ORDER_RELAXED);
  }
  