[Bug 2063369] Re: e2image reports invalid argument when used with big partitions

[Theodore Ts'o]

If the file system has a limit on the size of the file (for example,
ext4 has a maximum file size of 16TB), then when you do a relative seek
via llseek(fd, offset, SEEK_CURR), the system call will return EINVAL.
This is what is causing the error.

If you want to create a raw image of a very large file system, you'll
either to write it to a block device which is sufficiently large, or
you'll have to make sure the destination file system can support a file
size of that particular length.  (And, of course, has sufficient free
space to hold the raw image in the first place.)

Another workaround is to compress the file, e.g., "e2image -pr /dev/md3
- | gzip > md3.e2i.gz"

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https://bugs.launchpad.net/bugs/2063369

Title:
  e2image reports invalid argument when used with big partitions

Status in e2fsprogs package in Ubuntu:
  New

Bug description:
  It seems e2image is unable to work correctly with large filesystems. I
  get the following error with etx4 on top of 48TB RAID5 array.

  # e2image -pr /dev/md3 md3.e2i
  e2image 1.46.5 (30-Dec-2021)
  Scanning inodes...
  Copying 802818 / 1547571 blocks (52%) 00:02:21 remaining at 20.50 MB/sseek_relative: Invalid argument

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