On Sat, Sep 08, 2012 at 05:41:05PM +0800, Jianpeng Ma wrote: > Hi: > At present,i used blktrace to trace block io.But i always met error, > the message like: > >BLKTRACESETUP(2) /dev/sdc failed: 2/No such file or directory > >Thread 0 failed open /sys/kernel/debug/block/(null)/trace0: 2/No such file > >or directory > >Thread 2 failed open /sys/kernel/debug/block/(null)/trace2: 2/No such file > >or directory > >Thread 3 failed open /sys/kernel/debug/block/(null)/trace3: 2/No such file > >or directory > > >Thread 1 failed open /sys/kernel/debug/block/(null)/trace1: 2/No such file > >or directory > >FAILED to start thread on CPU 0: 1/Operation not permitted > >FAILED to start thread on CPU 1: 1/Operation not permitted > >FAILED to start thread on CPU 2: 1/Operation not permitted > >FAILED to start thread on CPU 3: 1/Operation not permitted > > But those isn't important. I add some message in kernel and found the reason > is inode already existed. > But the function __create_file dosen't return correctly errno.So blktrace > tool can't print correctly message. > I think func __create_file should return correctly message(ERR_PTR(error)) > not NULL.
Patches are always welcome :) greg k-h -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
