On Wed, 15 Jun 2011 11:38:16 -0700, Zahid Chowdhury wrote: > Hello Ryusuke, > Yes, "the data on the partition is important". Please let me know how to > "get a backtrace of the error" and I will send it to you. Thanks a lot. > > Zahid Try the following patch. You will need to install gdb and backtrace script available at: http://samba.org/ftp/unpacked/junkcode/segv_handler/backtrace The modified fsck0.nilfs2 will write a backtrace into "/var/log/bt_fsck0.nilfs2.<pid>.out". Regards, Ryusuke Konishi --- From: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx> fsck0.nilfs2: add backtrace routine Signed-off-by: Ryusuke Konishi <konishi.ryusuke@xxxxxxxxxxxxx> --- sbin/fsck/Makefile.am | 2 +- sbin/fsck/fsck0.nilfs2.c | 30 +++++++++++++++++++++++++++++- 2 files changed, 30 insertions(+), 2 deletions(-) diff --git a/sbin/fsck/Makefile.am b/sbin/fsck/Makefile.am index 789ae1b..5357967 100644 --- a/sbin/fsck/Makefile.am +++ b/sbin/fsck/Makefile.am @@ -1,6 +1,6 @@ ## Makefile.am -AM_CFLAGS = -Wall +AM_CFLAGS = -Wall -g AM_CPPFLAGS = -I$(top_srcdir)/include LDADD = -luuid $(top_builddir)/lib/libnilfsfeature.la \ $(top_builddir)/lib/libmountchk.la \ diff --git a/sbin/fsck/fsck0.nilfs2.c b/sbin/fsck/fsck0.nilfs2.c index 35a010c..6a41766 100644 --- a/sbin/fsck/fsck0.nilfs2.c +++ b/sbin/fsck/fsck0.nilfs2.c @@ -151,6 +151,32 @@ static inline void *nilfs_zalloc(size_t size) } /* + * The following part is based on segv_handler by Andrew Tridgell + * found at http://samba.org/ftp/unpacked/junkcode/segv_handler/ + * + * To enable this feature, install gdb and 'backtrace' script available + * on the above site. + */ +static void nilfs_backtrace(void) +{ + char cmd[100]; + char progname[100]; + char *p; + int n; + + n = readlink("/proc/self/exe", progname, sizeof(progname)); + progname[n] = 0; + + p = strrchr(progname, '/'); + *p = 0; + + snprintf(cmd, sizeof(cmd), + "backtrace %d > /var/log/bt_%s.%d.out 2>&1", + (int)getpid(), p+1, (int)getpid()); + system(cmd); +} + +/* * Block buffer */ static void *block_buffer = NULL; @@ -173,9 +199,11 @@ static void read_block(int fd, __u64 blocknr, void *buf, unsigned long size) { if (lseek64(fd, blocknr * blocksize, SEEK_SET) < 0 || - read(fd, buf, size) < size) + read(fd, buf, size) < size) { + nilfs_backtrace(); die("cannot read block (blocknr = %llu): %s", (unsigned long long)blocknr, strerror(errno)); + } } static inline __u64 segment_start_blocknr(unsigned long segnum) -- 1.7.3.5 -- To unsubscribe from this list: send the line "unsubscribe linux-nilfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
