From: short <> Date: Mon, 5 Aug 2002 20:19:01 +0000 (+0000) Subject: +GNU licensing accompanion X-Git-Url: http://git.jankratochvil.net/?p=badblock-guess.git;a=commitdiff_plain;h=bf17104b55bd5232d6564047ecd6dc8cbb397328 +GNU licensing accompanion --- diff --git a/COPYING b/COPYING new file mode 100644 index 0000000..5b6e7c6 --- /dev/null +++ b/COPYING @@ -0,0 +1,340 @@ + GNU GENERAL PUBLIC LICENSE + Version 2, June 1991 + + Copyright (C) 1989, 1991 Free Software Foundation, Inc. + 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + Everyone is permitted to copy and distribute verbatim copies + of this license document, but changing it is not allowed. + + Preamble + + The licenses for most software are designed to take away your +freedom to share and change it. By contrast, the GNU General Public +License is intended to guarantee your freedom to share and change free +software--to make sure the software is free for all its users. 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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + + +Also add information on how to contact you by electronic and paper mail. + +If the program is interactive, make it output a short notice like this +when it starts in an interactive mode: + + Gnomovision version 69, Copyright (C) year name of author + Gnomovision comes with ABSOLUTELY NO WARRANTY; for details type `show w'. + This is free software, and you are welcome to redistribute it + under certain conditions; type `show c' for details. + +The hypothetical commands `show w' and `show c' should show the appropriate +parts of the General Public License. Of course, the commands you use may +be called something other than `show w' and `show c'; they could even be +mouse-clicks or menu items--whatever suits your program. + +You should also get your employer (if you work as a programmer) or your +school, if any, to sign a "copyright disclaimer" for the program, if +necessary. Here is a sample; alter the names: + + Yoyodyne, Inc., hereby disclaims all copyright interest in the program + `Gnomovision' (which makes passes at compilers) written by James Hacker. + + , 1 April 1989 + Ty Coon, President of Vice + +This General Public License does not permit incorporating your program into +proprietary programs. If your program is a subroutine library, you may +consider it more useful to permit linking proprietary applications with the +library. If this is what you want to do, use the GNU Library General +Public License instead of this License. diff --git a/Makefile b/Makefile index fd02f7e..16d5e69 100644 --- a/Makefile +++ b/Makefile @@ -1,5 +1,22 @@ # $Id$ +# badblock-guess: Quickly recover most of the data from a damaged disk +# Copyright (C) 2002 Jan Kratochvil +# +# 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; exactly version 2 of the License required +# +# 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + + TARGETS=badblock-guess all: $(TARGETS) diff --git a/README b/README new file mode 100644 index 0000000..fee9795 --- /dev/null +++ b/README @@ -0,0 +1,174 @@ +$Id$ + + +badblock-guess: Quickly recover most of the data from a damaged disk + + +Purpose +------- + +badblock-guess will try to find all readable sectors of the disk in minimal +time. It is similiar to: + dd if= of= bs=512 conv=noerror,sync + +but dd(1) solution can last for many weeks/months on heavily corrupted disk +media as each bad sector attempted to be read costs about 5secs (your disk +bad-blocks performance may significantly vary). badblock-guess tries to first +find and recover most of the data from healthy zones of the disk and later it +will start trying to recover smaller bits of information spread between/around +badblock zones - the principle of its operation is the fact that badblocks +usually occur in chunks. If you don't user-terminate badblock-guess and leave +it to finish completely itself, its execution time should be approx. the same +as for dd(1). You may also use it to guess the remaining execution time as +during its later execution phases it will be showing the remaining number of +sectors ("TODO=x") while most of them are probably badblocks in this phase of +execution. + +This program will not recover data of any sector with failing read command. +If dd(1) command above finishes for you in a reasonable time, you don't need +this program. No special read methods are used. No vendor-specific dependencies +exist. No IDE, SCSI or any other specific device is required. + + +License +------- + +GNU GENERAL PUBLIC LICENSE, Version 2, June 1991. + +See the file COPYING for its details. It is also available at: + http://www.gnu.org/licenses/gpl.txt + + +Usage +----- + +Syntax: badblock-guess [] + +Possible device cases (watch out for vs. differences!): + + No is specified: Just the is scanned for errors and + the detected badblocks list is output. + + is a harddrive (/dev/hdc): Other harddrive of equal or higher + capacity is recommended + + is a partition (/dev/hdc1): Partition on any other physical + drive in the system with the exactly same partition size is + recommended + + is a file: File must exist but it will be enlarged when + needed. Commands: + rm -f /tmp/hdc1.img; touch /tmp/hdc1.img + are recommended to specify file "/tmp/hdc1.img" for + +All the numbers are always expressed as sector (that means 512 bytes) +number/count! + +Never terminate badblock-guess by CTRL-C or kill(1) if you want to utilize its +results - always use 'f' followed by ENTER ('f' for 'finish'). You may not see +'f' while typing it - type it blindly (without quotes - just the one letter!). +During finishing the program will produce the badblocks list output to its +stdout while it will be clearing the 'bad' or 'not-yet-done' zones of the +target disk (if any specified). + +TODO: Resuming of the operation from the badblocks list to continue the + scanning is not yet implemented. + + +hdparm +------ + +Although not required it is strongly recommended to turn of drive readahead +during severe disk failure recoveries. You can use + + /sbin/hdparm -A0a0 /dev/hdX (or /dev/sdX etc.) + +for your drive to do it. You may need to install some extra package with +hdparm(8) for your Linux distribution. + +Be aware that the disk performance will be critically hit - you may expect read +performance about 90KB/s (approx. 7.5GB/24hours if no badblocks read retrying +is needed). YMMV. + + +Compilation +----------- + +Type: + make + +And you should have now the binary file "badblock-guess" compiled out. +You may need to install the following packages of your Linux distribution: + e2fsprogs, e2fsprogs-devel + glib, glib-devel (this is NOT glibc!) + other standard C compilation tools and libraries... + +Compiled out binary is fully statically linked, you can bring it with you on +the floppy everywhere (running Linux is still required, of course!). + + +Operation description +--------------------- + +During its run it will update its progress line. All the numbers are always +expressed as sector (that means 512 bytes) number/count. + + @342342/819223,TODO=8192,bad=0,largest=8192,hunks=1 + ^A ^B ^C ^D ^E ^F + +A=currently reding sector 342342 ... +B=... out of total sector 819223 of the disk (or partition) +C=8192 secters weren't yet attempted to be read +D=0 sectors were found with proof of read failure +E=currently read hunk of 8192 sectors + =also there is a maximum size of hunk 8192 sectors +F=total remaining hunks to be processed + +Initially there is just one hunk (0-media_size) to be read. When no errors on +the disk are found, this one hunk is finished and no output (bad sectors list) +is generated. + +When we find bad a sector, we divide our todo-listed hunks by the schema: + +> successfuly read 10 ->[1 bad]|end + +We always read the biggest hunk "todo", "todo" hunks of the size are read in +backwards order (to approach the found bad blocks from the other side). + +In this case the program would start with the status line (*): + +@27/46,TODO=35,bad=1,largest=19,hunks=5 + ^A ^B ^C ^D ^E ^F + +A=we start reading the first sector of the largest hunk (10+1+1+2+4+9) +B=total number of sectors on the disk (10+1+1+2+4+9+19) +C=still have to read all hunks (1+2+4+9+19) +D=we found just one confirmed bad sector (1) +E=the largest hunk "todo" on the disk is (19) +F=total number of the remaining "todo" hunks (1+1+1+1+1) + +If you terminate badblock-guess run (by 'f' key, see above!), you can be sure +that you will loose the data of at most sectors after any bad sector +found. But you still can loose sectors of data. + +(*) The status line is printed once per a second and thus in real you can't + predict the exact states of the progress status line, of course. + + +Output badblock list format +--------------------------- + +Output badblock list has form + +first_sector-behind_last_sector ; + +"behind_last_sector" is last_bad_sector+1. Thus single bad sector would be: + 5678-5679 + +The following three types of output lines can occur. The first one is just +a shortcut for the second+third - such output is chosen when TODO blocks are +consequently following BAD blocks. + +1000-9192 ;BAD=100, TODO(@1100-@9192)=8092 +1000-1100 ;BAD=100 +1100-9192 ;TODO=8092 diff --git a/badblock-guess.c b/badblock-guess.c index 56ed478..f715cd1 100644 --- a/badblock-guess.c +++ b/badblock-guess.c @@ -1,5 +1,23 @@ /* $Id$ */ +/* + * badblock-guess: Quickly recover most of the data from a damaged disk + * Copyright (C) 2002 Jan Kratochvil + * + * 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; exactly version 2 of the License required + * + * 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA + */ + #define _LARGEFILE_SOURCE #define _LARGEFILE64_SOURCE @@ -390,7 +408,15 @@ int main(int argc,char **argv) setlinebuf(stderr); if (argc!=2 && argc!=3) { - fprintf(stderr,"Syntax: badblock-guess []\n"); + fprintf(stderr,"\ +badblock-guess, Copyright (C) 2002 Jan Kratochvil \n\ +$Id$\n\ +badblock-guess comes with ABSOLUTELY NO WARRANTY.\n\ +This is free software, and you are welcome to redistribute it\n\ +under certain conditions.\n\ +\n\ +Syntax: badblock-guess []\n\ +\n"); exit(EXIT_FAILURE); } if (-1==(src_fd=open64((src_name=argv[1]),O_RDONLY|O_BINARY))) {