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269 lines
7.5 KiB
C++
269 lines
7.5 KiB
C++
/* Copyright (c) 2004, 2010, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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/**
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@file
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@brief
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Functions for discover of frm file from handler
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*/
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#include "sql_priv.h"
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#include "unireg.h"
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#include "discover.h"
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#include <my_dir.h>
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/**
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Read the contents of a .frm file.
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frmdata and len are set to 0 on error.
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@param name path to table-file "db/name"
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@param frmdata frm data
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@param len length of the read frmdata
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@retval
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0 ok
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@retval
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1 Could not open file
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@retval
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2 Could not stat file
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@retval
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3 Could not allocate data for read. Could not read file
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*/
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int readfrm(const char *name, const uchar **frmdata, size_t *len)
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{
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int error;
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char index_file[FN_REFLEN];
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File file;
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size_t read_len;
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uchar *read_data;
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MY_STAT state;
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DBUG_ENTER("readfrm");
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DBUG_PRINT("enter",("name: '%s'",name));
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*frmdata= NULL; // In case of errors
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*len= 0;
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error= 1;
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if ((file= mysql_file_open(key_file_frm,
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fn_format(index_file, name, "", reg_ext,
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MY_UNPACK_FILENAME|MY_APPEND_EXT),
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O_RDONLY | O_SHARE,
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MYF(0))) < 0)
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goto err_end;
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// Get length of file
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error= 2;
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if (mysql_file_fstat(file, &state, MYF(0)))
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goto err;
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read_len= (size_t)MY_MIN(FRM_MAX_SIZE, state.st_size); // safety
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// Read whole frm file
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error= 3;
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if (!(read_data= (uchar*)my_malloc(read_len, MYF(MY_WME))))
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goto err;
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if (mysql_file_read(file, read_data, read_len, MYF(MY_NABP)))
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{
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my_free(read_data);
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goto err;
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}
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// Setup return data
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*frmdata= (uchar*) read_data;
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*len= read_len;
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error= 0;
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err:
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if (file > 0)
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(void) mysql_file_close(file, MYF(MY_WME));
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err_end: /* Here when no file */
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DBUG_RETURN (error);
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} /* readfrm */
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/*
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Write the content of a frm data pointer
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to a frm file.
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@param path path to table-file "db/name"
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@param frmdata frm data
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@param len length of the frmdata
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@retval
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0 ok
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@retval
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2 Could not write file
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*/
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int writefrm(const char *path, const char *db, const char *table,
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bool tmp_table, const uchar *frmdata, size_t len)
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{
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char file_name[FN_REFLEN+1];
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int error;
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int create_flags= O_RDWR | O_TRUNC;
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DBUG_ENTER("writefrm");
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DBUG_PRINT("enter",("name: '%s' len: %lu ",path, (ulong) len));
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if (tmp_table)
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create_flags|= O_EXCL | O_NOFOLLOW;
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strxnmov(file_name, sizeof(file_name)-1, path, reg_ext, NullS);
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File file= mysql_file_create(key_file_frm, file_name,
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CREATE_MODE, create_flags, MYF(0));
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if ((error= file < 0))
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{
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if (my_errno == ENOENT)
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my_error(ER_BAD_DB_ERROR, MYF(0), db);
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else
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my_error(ER_CANT_CREATE_TABLE, MYF(0), db, table, my_errno);
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}
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else
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{
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error= mysql_file_write(file, frmdata, len, MYF(MY_WME | MY_NABP));
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if (!error && !tmp_table && opt_sync_frm)
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error= mysql_file_sync(file, MYF(MY_WME)) ||
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my_sync_dir_by_file(file_name, MYF(MY_WME));
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error|= mysql_file_close(file, MYF(MY_WME));
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}
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DBUG_RETURN(error);
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} /* writefrm */
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static inline void advance(FILEINFO* &from, FILEINFO* &to,
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FILEINFO* cur, bool &skip)
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{
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if (skip) // if not copying
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from= cur; // just advance the start pointer
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else // if copying
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if (to == from) // but to the same place (not shifting the data)
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from= to= cur; // advance both pointers
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else // otherwise
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while (from < cur) // have to copy [from...cur) to [to...)
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*to++ = *from++;
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skip= false;
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}
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/**
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Go through the directory listing looking for files with a specified
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extension and add them to the result list
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@details
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This function may be called many times on the same directory listing
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but with different extensions. To avoid discovering the same table twice,
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whenever a table file is discovered, all files with the same name
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(independently from the extensions) are removed from the list.
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Example: the list contained
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{ "db.opt", "t1.MYD", "t1.MYI", "t1.frm", "t2.ARZ", "t3.ARZ", "t3.frm" }
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on discovering all ".frm" files, tables "t1" and "t3" will be found,
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and list will become
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{ "db.opt", "t2.ARZ" }
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and now ".ARZ" discovery can discover the table "t2"
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@note
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This function assumes that the directory listing is sorted alphabetically.
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@note Partitioning makes this more complicated. A partitioned table t1 might
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have files, like t1.frm, t1#P#part1.ibd, t1#P#foo.ibd, etc.
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That means we need to compare file names only up to the first '#' or '.'
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whichever comes first.
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*/
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int extension_based_table_discovery(MY_DIR *dirp, const char *ext_meta,
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handlerton::discovered_list *result)
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{
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CHARSET_INFO *cs= character_set_filesystem;
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size_t ext_meta_len= strlen(ext_meta);
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FILEINFO *from, *to, *cur, *end;
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bool skip= false;
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from= to= cur= dirp->dir_entry;
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end= cur + dirp->number_of_files;
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while (cur < end)
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{
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char *octothorp= strrchr(cur->name + 1, '#');
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char *ext= strchr(octothorp ? octothorp : cur->name, FN_EXTCHAR);
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if (ext)
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{
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size_t len= (octothorp ? octothorp : ext) - cur->name;
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if (from != cur &&
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(my_strnncoll(cs, (uchar*)from->name, len, (uchar*)cur->name, len) ||
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(from->name[len] != FN_EXTCHAR && from->name[len] != '#')))
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advance(from, to, cur, skip);
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if (my_strnncoll(cs, (uchar*)ext, strlen(ext),
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(uchar*)ext_meta, ext_meta_len) == 0)
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{
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*ext = 0;
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if (result->add_file(cur->name))
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return 1;
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*ext = FN_EXTCHAR;
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skip= true; // table discovered, skip all files with the same name
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}
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}
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else
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{
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advance(from, to, cur, skip);
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from++;
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}
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cur++;
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}
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advance(from, to, cur, skip);
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dirp->number_of_files= to - dirp->dir_entry;
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return 0;
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}
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/**
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Simple, not reusable file-based table discovery
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@details
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simplified version of extension_based_table_discovery(), that does not
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modify the list of files. It cannot be called many times for the same
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directory listing, otherwise it'll produce duplicate results.
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*/
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int ext_table_discovery_simple(MY_DIR *dirp,
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handlerton::discovered_list *result)
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{
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CHARSET_INFO *cs= character_set_filesystem;
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FILEINFO *cur, *end;
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cur= dirp->dir_entry;
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end= cur + dirp->number_of_files;
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while (cur < end)
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{
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char *ext= strrchr(cur->name, FN_EXTCHAR);
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if (ext)
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{
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if (my_strnncoll(cs, (uchar*)ext, strlen(ext),
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(uchar*)reg_ext, reg_ext_length) == 0)
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{
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*ext = 0;
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if (result->add_file(cur->name))
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return 1;
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}
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}
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cur++;
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}
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return 0;
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}
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