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URL:
  <http://savannah.cern.ch/bugs/?97560>

                 Summary: bad rc for XrdPosix_Read with bad checksum file
                 Project: XROOTD
            Submitted by: kotlyar
            Submitted on: 2012-09-18 09:54
                Severity: 3 - Normal
                Priority: 5 - Normal
                  Status: None
                 Privacy: Public
             Assigned to: None
        Originator Email: 
             Open/Closed: Open
         Discussion Lock: Any
      Fixed by commit(s): 

    _______________________________________________________

Details:

Hi,

There is a problem with CASTOR xrootd (xrootd-xcastor2fs-1.2.0-1.castor2113)
behavior considering checksum checking.


I read a small file with read. rc=XrdPosix_Read(fd,buf,SIZEb);

For the "good" file I have rc="the file size" and errno=0

For the "bad" file (wrong checksum attributes) I have rc=0 and errno=0
In the log (/var/log/xroot/server/xrdlog.server)  for the bad file I have

120914 14:12:09 17814 castor2ofs_verifychecksum: kotlyar.10818:8@lxc2dev5
Unable to verify checksum - checksum wrong! ; Input/output error
120914 14:12:09 17814 kotlyar.10818:8@lxc2dev5 XrootdResponse: 0100 sending
err 3005: Unable to verify checksum - checksum wrong! ; Input/output error

So rc is zero but should be -1 as soon as there is an Input\output error. 

To make a "bad" file:
setfattr -n user.castor.checksum.value -v 9fb8f533
[log in to unmask]



Here is a small program to check it


cc -D_LARGEFILE64_SOURCE -DCTHREAD_POSIX -D_THREAD_SAFE -D_REENTRANT
-D_FILE_OFFSET_BITS=64 -fPIC -D_LARGEFILE_SOURCE -I/usr/include/xrootd 
-lXrdPosixPreload xrd_read.c



#include <XrdPosix/XrdPosixExtern.hh>
#include <stdio.h>
#include <sys/stat.h>
#include <errno.h>
#include <fcntl.h>

int main(int argc, char *argv[])
{
     int fd,rc;
     #define SIZEb 12321
    char buf[SIZEb];
     int flags=O_RDONLY ;
    errno =0;
    rc=XrdPosix_Open(argv[1],flags,0666);
    printf("open rc = %d errno %d\n", rc, errno);

    if (-1 == rc) { printf("error open:
%s(%d)\n",strerror(errno),errno);return 1;}
    fd=rc;
    errno=0;
    rc=XrdPosix_Read(fd,buf,SIZEb);
    if (-1 == rc) { printf("error read:
%s(%d)\n",strerror(errno),errno);return 1;}

    printf("read rc = %d errno %d\n", rc, errno);

    printf("done\n");

    XrdPosix_Close(fd);
    return 0;
}


For the "good" file we have:

[root@lxc2dev5 rtcpd]# runuser kotlyar -c "./a.out
root://lxc2dev5d1.cern.ch:1095///nothing\[log in to unmask]\&castor2fs.pfn2=tpsrv"
open rc = 7 errno 2
read rc = 774 errno 0
done


For the "bad" file we have:

[root@lxc2dev5 rtcpd]# runuser kotlyar -c "./a.out
root://lxc2dev5d1.cern.ch:1095///nothing\[log in to unmask]\&castor2fs.pfn2=tpsrv"
open rc = 7 errno 2
read rc = 0 errno 0
done


Regards,
Victor




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