On Dec 2, 2010, at 3:33 AM, Michael Monnerie wrote:
Good idea, here is the program: Eli #!/bin/bash # # Copyright 2010 Eli Morris, Travis O'Brien, University of California # # remove_bad.sh is free software: you can redistribute it under the terms # of the GNU General Public License as published by the Free Software # Foundation, either version 3 of the License, or (at your option) any later # version. # # 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, see <http://www.gnu.org/licenses/>. # # #remove_bad.sh: A script to determine whether any part of a file falls within a #set of blocks (indicated by arguments 1 and 2). This script is #originally written with the intent to find files on a file system that #exist(ed) on a corrupt section of the file system. It generates a list of files #that are potentially bad, so that they can be removed by another script. # #Check command line arguments; grab arguments 1 and 2 if [ $# -eq 2 ]; then BAD_BLOCK_BEGINNING=$1 BAD_BLOCK_END=$2 echo "bad block beginning $BAD_BLOCK_BEGINNING" echo "bad block ending $BAD_BLOCK_END" #if there aren't exactly 2 arguments then print the usage to the user else echo "usage: remove_bad.sh beginning_block ending_block" exit fi remove file from last run if ( test -e "./naughty_list.txt") then echo "removing the previous naughty list" rm "./naughty_list.txt" fi IFS=$'\n' #set the field separator to the carriage return character ALL_FILES=(`find /export/vol5 -type f`) #A list of all files on the volume, SUBSTITUTE NAME OF YOUR VOLUME NUM_FILES=${#ALL_FILES[@]} #The number of files on the volume echo "number of files is $NUM_FILES" #Report the number of files to the user # for each of the file in vol5 for (( COUNT=0; COUNT<$NUM_FILES; COUNT++)) do #Report which file is being worked on echo "file number: $COUNT is ${ALL_FILES[$COUNT]}" # report number of files to go FILES_TO_GO=$((NUM_FILES-COUNT)) echo "files left: $FILES_TO_GO" #Run xfs_bmap to get the blocks that the file lives within OUTPUT=(`xfs_bmap ${ALL_FILES[$COUNT]}`) # output looks like this # vol5dump: # 0: [0..1053271]: 5200578944..5201632215 BAD_FILE=0 #Initialize the bad file flag NUM_LINES=${#OUTPUT[@]} #The number of lines from xfs_bmap # echo "number of lines for file: $NUM_LINES" #Report the number of lines to the user #Loop through each line for (( LINE=1; LINE < $NUM_LINES; LINE++)) do # echo "line number $LINE: output: ${OUTPUT[$LINE]}" #Report the current working line # get the block range from the line BLOCKS=`echo ${OUTPUT[$LINE]} | cut -d':' -f3` #Report the number of blocks occupied # echo "blocks after cut: '$BLOCKS'" #Use cut to get the first and last block for the file FIRST_BLOCK=`echo $BLOCKS | cut -d'.' -f1` LAST_BLOCK=`echo $BLOCKS | cut -d'.' -f3` #Report these to the user # echo "beginning block: $FIRST_BLOCK" # echo "ending block: $LAST_BLOCK" #TODO: I'm not sure what exactly 'hole' means, but I get the impression that it has something #to do with XFS's way of avoiding file fragmentation. TAO if [ "$BLOCKS" != " hole" ]; then #Don't deal with lines that report 'hole' # compare to bad block region #For now, check whether the blocks for the file fall within the user-given block range #if any of the blocks do, then mark this file as bad. if ( (( "$BAD_BLOCK_BEGINNING" <= "$FIRST_BLOCK")) && (( "$FIRST_BLOCK" <= "$BAD_BLOCK_END")) ); then # echo "hit first criterium" BAD_FILE=1 break elif ( (( "$BAD_BLOCK_BEGINNING" <= "$LAST_BLOCK")) && (( "$LAST_BLOCK" <= "$BAD_BLOCK_END")) ); then # echo "hit second criterium" BAD_FILE=1 break fi fi done # add the file to the list of bad files if (($BAD_FILE == 1)); then #Report to the user that the current file is bad echo "putting file: ${ALL_FILES[$COUNT]} on the naughty list" #Write the file's name to the list echo "${ALL_FILES[$COUNT]}" >> naughty_list.txt fi done echo "program_ended_succesfully" >> naughty_list.txt |
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