debugfs occasionally fails to read inode data
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I need to get date and time when a file was created. The file is stored at ext4 filesystem so the information is available in the i-node and I use debugfs to read this information:
# debugfs -R "stat <3922>" /dev/sda1 | grep crtime
debugfs 1.43-WIP (18-May-2015)
crtime: 0x5b646acd:b0175ac8 -- Fri Aug 3 14:46:37 2018
That works fine but the command sometimes fails:
# debugfs -R "stat <3922>" /dev/sda1
debugfs 1.43-WIP (18-May-2015)
/dev/sda1: Block bitmap checksum does not match bitmap while reading block bitmap
stat: Filesystem not open
The next debugfs execution returns correct data.
What does exactly mean the error Block bitmap checksum does not match bitmap while reading block bitmap ?
ext4 inode debugfs
asked Aug 3 at 15:09
Zaboj Campula
445516
add a comment |Â
up vote
2
down vote
favorite
I need to get date and time when a file was created. The file is stored at ext4 filesystem so the information is available in the i-node and I use debugfs to read this information:
# debugfs -R "stat <3922>" /dev/sda1 | grep crtime
debugfs 1.43-WIP (18-May-2015)
crtime: 0x5b646acd:b0175ac8 -- Fri Aug 3 14:46:37 2018
That works fine but the command sometimes fails:
# debugfs -R "stat <3922>" /dev/sda1
debugfs 1.43-WIP (18-May-2015)
/dev/sda1: Block bitmap checksum does not match bitmap while reading block bitmap
stat: Filesystem not open
The next debugfs execution returns correct data.
What does exactly mean the error Block bitmap checksum does not match bitmap while reading block bitmap ?
ext4 inode debugfs
asked Aug 3 at 15:09
Zaboj Campula
445516
Modern versions of thestatutility (from coreutils) will show you the birth time, too.
– Mark Plotnick
Aug 3 at 15:47
@MarkPlotnick: Unfortunately it is an embedded linux, that is not easy to upgrade.
– Zaboj Campula
Aug 3 at 17:15
Do you have a C compiler? github.com/torvalds/linux/blob/master/samples/statx/… will do almost the same thing as thestatutility.
– Mark Plotnick
Aug 3 at 18:00
@MarkPlotnick: I have a C compiler but statx is not an option because it was added to the linux kernel 4.11 and I have 3.10.
– Zaboj Campula
yesterday
If your filesystem sits on top of an lvm volume, you could try making a snapshot and then run debugfs on the snapshot. That should reduce, but not eliminate, inconsistencies caused by examining a constantly changing filesystem.
– Mark Plotnick
13 hours ago
add a comment |Â
up vote
2
down vote
favorite
up vote
2
down vote
favorite
I need to get date and time when a file was created. The file is stored at ext4 filesystem so the information is available in the i-node and I use debugfs to read this information:
# debugfs -R "stat <3922>" /dev/sda1 | grep crtime
debugfs 1.43-WIP (18-May-2015)
crtime: 0x5b646acd:b0175ac8 -- Fri Aug 3 14:46:37 2018
That works fine but the command sometimes fails:
# debugfs -R "stat <3922>" /dev/sda1
debugfs 1.43-WIP (18-May-2015)
/dev/sda1: Block bitmap checksum does not match bitmap while reading block bitmap
stat: Filesystem not open
The next debugfs execution returns correct data.
What does exactly mean the error Block bitmap checksum does not match bitmap while reading block bitmap ?
ext4 inode debugfs
asked Aug 3 at 15:09
Zaboj Campula
445516
I need to get date and time when a file was created. The file is stored at ext4 filesystem so the information is available in the i-node and I use debugfs to read this information:
# debugfs -R "stat <3922>" /dev/sda1 | grep crtime
debugfs 1.43-WIP (18-May-2015)
crtime: 0x5b646acd:b0175ac8 -- Fri Aug 3 14:46:37 2018
That works fine but the command sometimes fails:
# debugfs -R "stat <3922>" /dev/sda1
debugfs 1.43-WIP (18-May-2015)
/dev/sda1: Block bitmap checksum does not match bitmap while reading block bitmap
stat: Filesystem not open
The next debugfs execution returns correct data.
What does exactly mean the error Block bitmap checksum does not match bitmap while reading block bitmap ?
ext4 inode debugfs
asked Aug 3 at 15:09
Zaboj Campula
445516
asked Aug 3 at 15:09
Zaboj Campula
445516
asked Aug 3 at 15:09
Zaboj Campula
445516
asked Aug 3 at 15:09
Zaboj Campula
445516
445516
Modern versions of thestatutility (from coreutils) will show you the birth time, too.
– Mark Plotnick
Aug 3 at 15:47
@MarkPlotnick: Unfortunately it is an embedded linux, that is not easy to upgrade.
– Zaboj Campula
Aug 3 at 17:15
Do you have a C compiler? github.com/torvalds/linux/blob/master/samples/statx/… will do almost the same thing as thestatutility.
– Mark Plotnick
Aug 3 at 18:00
@MarkPlotnick: I have a C compiler but statx is not an option because it was added to the linux kernel 4.11 and I have 3.10.
– Zaboj Campula
yesterday
If your filesystem sits on top of an lvm volume, you could try making a snapshot and then run debugfs on the snapshot. That should reduce, but not eliminate, inconsistencies caused by examining a constantly changing filesystem.
– Mark Plotnick
13 hours ago
add a comment |Â
Modern versions of thestatutility (from coreutils) will show you the birth time, too.
– Mark Plotnick
Aug 3 at 15:47
@MarkPlotnick: Unfortunately it is an embedded linux, that is not easy to upgrade.
– Zaboj Campula
Aug 3 at 17:15
Do you have a C compiler? github.com/torvalds/linux/blob/master/samples/statx/… will do almost the same thing as thestatutility.
– Mark Plotnick
Aug 3 at 18:00
@MarkPlotnick: I have a C compiler but statx is not an option because it was added to the linux kernel 4.11 and I have 3.10.
– Zaboj Campula
yesterday
If your filesystem sits on top of an lvm volume, you could try making a snapshot and then run debugfs on the snapshot. That should reduce, but not eliminate, inconsistencies caused by examining a constantly changing filesystem.
– Mark Plotnick
13 hours ago
Modern versions of the
stat utility (from coreutils) will show you the birth time, too.– Mark Plotnick
Aug 3 at 15:47
Modern versions of the
stat utility (from coreutils) will show you the birth time, too.– Mark Plotnick
Aug 3 at 15:47
@MarkPlotnick: Unfortunately it is an embedded linux, that is not easy to upgrade.
– Zaboj Campula
Aug 3 at 17:15
@MarkPlotnick: Unfortunately it is an embedded linux, that is not easy to upgrade.
– Zaboj Campula
Aug 3 at 17:15
Do you have a C compiler? github.com/torvalds/linux/blob/master/samples/statx/… will do almost the same thing as the
stat utility.– Mark Plotnick
Aug 3 at 18:00
Do you have a C compiler? github.com/torvalds/linux/blob/master/samples/statx/… will do almost the same thing as the
stat utility.– Mark Plotnick
Aug 3 at 18:00
@MarkPlotnick: I have a C compiler but statx is not an option because it was added to the linux kernel 4.11 and I have 3.10.
– Zaboj Campula
yesterday
@MarkPlotnick: I have a C compiler but statx is not an option because it was added to the linux kernel 4.11 and I have 3.10.
– Zaboj Campula
yesterday
If your filesystem sits on top of an lvm volume, you could try making a snapshot and then run debugfs on the snapshot. That should reduce, but not eliminate, inconsistencies caused by examining a constantly changing filesystem.
– Mark Plotnick
13 hours ago
If your filesystem sits on top of an lvm volume, you could try making a snapshot and then run debugfs on the snapshot. That should reduce, but not eliminate, inconsistencies caused by examining a constantly changing filesystem.
– Mark Plotnick
13 hours ago
add a comment |Â
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Modern versions of the
statutility (from coreutils) will show you the birth time, too.– Mark Plotnick
Aug 3 at 15:47
@MarkPlotnick: Unfortunately it is an embedded linux, that is not easy to upgrade.
– Zaboj Campula
Aug 3 at 17:15
Do you have a C compiler? github.com/torvalds/linux/blob/master/samples/statx/… will do almost the same thing as the
statutility.– Mark Plotnick
Aug 3 at 18:00
@MarkPlotnick: I have a C compiler but statx is not an option because it was added to the linux kernel 4.11 and I have 3.10.
– Zaboj Campula
yesterday
If your filesystem sits on top of an lvm volume, you could try making a snapshot and then run debugfs on the snapshot. That should reduce, but not eliminate, inconsistencies caused by examining a constantly changing filesystem.
– Mark Plotnick
13 hours ago