Chris, I tried some commands and captured what /var/log/message "said" about each. I'm somewhat alarmed that these errors somehow crept into the image. There were NO outages or interruptions during the conversion. smartctl doesn't "say" anything about drive problems either... hence the alarm. Regards, George... from file command on /export/home/ext2_saved/image: Feb 21 18:50:29 fc35 kernel: BTRFS warning (device sda8): csum failed root 256 ino 257 off 0 csum 0xe05b8b2e expected csum 0xc90f1f63 mirror 1 Feb 21 18:50:29 fc35 kernel: BTRFS error (device sda8): bdev /dev/sda8 errs: wr 0, rd 0, flush 0, corrupt 149, gen 0 from the mount -t ext4 -o ro,loop /export/home/ext2_saved/image /mnt/ext4 command: Feb 21 18:55:38 fc35 kernel: BTRFS warning (device sda8): csum failed root 256 ino 257 off 0 csum 0xe05b8b2e expected csum 0xc90f1f63 mirror 1 Feb 21 18:55:38 fc35 kernel: BTRFS error (device sda8): bdev /dev/sda8 errs: wr 0, rd 0, flush 0, corrupt 150, gen 0 Feb 21 18:55:38 fc35 kernel: blk_update_request: I/O error, dev loop0, sector 2 op 0x0:(READ) flags 0x1000 phys_seg 1 prio class 0 Feb 21 18:55:38 fc35 kernel: EXT4-fs (loop0): unable to read superblock from losetup -d /dev/loop0 and losetup -r /dev/loop0 /mnt/btrfs/ext2_saved/image Feb 21 19:34:00 fc35 kernel: loop0: detected capacity change from 3470811312 to 0 Feb 21 19:34:00 fc35 kernel: BTRFS warning (device sda8): csum failed root 256 ino 257 off 0 csum 0xe05b8b2e expected csum 0xc90f1f63 mirror 1 Feb 21 19:34:00 fc35 kernel: BTRFS error (device sda8): bdev /dev/sda8 errs: wr 0, rd 0, flush 0, corrupt 151, gen 0 Feb 21 19:34:00 fc35 kernel: BTRFS warning (device sda8): csum failed root 256 ino 257 off 0 csum 0xe05b8b2e expected csum 0xc90f1f63 mirror 1 Feb 21 19:34:00 fc35 kernel: BTRFS error (device sda8): bdev /dev/sda8 errs: wr 0, rd 0, flush 0, corrupt 152, gen 0 Feb 21 19:34:00 fc35 kernel: blk_update_request: I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0 Feb 21 19:34:00 fc35 kernel: BTRFS warning (device sda8): csum failed root 256 ino 257 off 0 csum 0xe05b8b2e expected csum 0xc90f1f63 mirror 1 Feb 21 19:34:00 fc35 kernel: BTRFS error (device sda8): bdev /dev/sda8 errs: wr 0, rd 0, flush 0, corrupt 153, gen 0 Feb 21 19:34:00 fc35 kernel: blk_update_request: I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 Feb 21 19:34:00 fc35 kernel: Buffer I/O error on dev loop0, logical block 0, async page read Feb 21 19:34:00 fc35 kernel: BTRFS warning (device sda8): csum failed root 256 ino 257 off 0 csum 0xe05b8b2e expected csum 0xc90f1f63 mirror 1 Feb 21 19:34:00 fc35 kernel: BTRFS error (device sda8): bdev /dev/sda8 errs: wr 0, rd 0, flush 0, corrupt 154, gen 0 Feb 21 19:34:00 fc35 kernel: blk_update_request: I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 Feb 21 19:34:00 fc35 kernel: Buffer I/O error on dev loop0, logical block 0, async page read Feb 21 19:34:00 fc35 kernel: BTRFS warning (device sda8): csum failed root 256 ino 257 off 0 csum 0xe05b8b2e expected csum 0xc90f1f63 mirror 1 Feb 21 19:34:00 fc35 kernel: BTRFS error (device sda8): bdev /dev/sda8 errs: wr 0, rd 0, flush 0, corrupt 155, gen 0 Feb 21 19:34:00 fc35 kernel: blk_update_request: I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 Feb 21 19:34:00 fc35 kernel: Buffer I/O error on dev loop0, logical block 0, async page read from file command on /export/home/ext2_saved/image: Feb 21 18:50:29 fc35 kernel: BTRFS warning (device sda8): csum failed root 256 ino 257 off 0 csum 0xe05b8b2e expected csum 0xc90f1f63 mirror 1 Feb 21 18:50:29 fc35 kernel: BTRFS error (device sda8): bdev /dev/sda8 errs: wr 0, rd 0, flush 0, corrupt 149, gen 0 from the mount -t ext4 -o ro,loop /export/home/ext2_saved/image /mnt/ext4 command: Feb 21 18:55:38 fc35 kernel: BTRFS warning (device sda8): csum failed root 256 ino 257 off 0 csum 0xe05b8b2e expected csum 0xc90f1f63 mirror 1 Feb 21 18:55:38 fc35 kernel: BTRFS error (device sda8): bdev /dev/sda8 errs: wr 0, rd 0, flush 0, corrupt 150, gen 0 Feb 21 18:55:38 fc35 kernel: blk_update_request: I/O error, dev loop0, sector 2 op 0x0:(READ) flags 0x1000 phys_seg 1 prio class 0 Feb 21 18:55:38 fc35 kernel: EXT4-fs (loop0): unable to read superblock from losetup -d /dev/loop0 and losetup -r /dev/loop0 /mnt/btrfs/ext2_saved/image Feb 21 19:34:00 fc35 kernel: loop0: detected capacity change from 3470811312 to 0 Feb 21 19:34:00 fc35 kernel: BTRFS warning (device sda8): csum failed root 256 ino 257 off 0 csum 0xe05b8b2e expected csum 0xc90f1f63 mirror 1 Feb 21 19:34:00 fc35 kernel: BTRFS error (device sda8): bdev /dev/sda8 errs: wr 0, rd 0, flush 0, corrupt 151, gen 0 Feb 21 19:34:00 fc35 kernel: BTRFS warning (device sda8): csum failed root 256 ino 257 off 0 csum 0xe05b8b2e expected csum 0xc90f1f63 mirror 1 Feb 21 19:34:00 fc35 kernel: BTRFS error (device sda8): bdev /dev/sda8 errs: wr 0, rd 0, flush 0, corrupt 152, gen 0 Feb 21 19:34:00 fc35 kernel: blk_update_request: I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x80700 phys_seg 1 prio class 0 Feb 21 19:34:00 fc35 kernel: BTRFS warning (device sda8): csum failed root 256 ino 257 off 0 csum 0xe05b8b2e expected csum 0xc90f1f63 mirror 1 Feb 21 19:34:00 fc35 kernel: BTRFS error (device sda8): bdev /dev/sda8 errs: wr 0, rd 0, flush 0, corrupt 153, gen 0 Feb 21 19:34:00 fc35 kernel: blk_update_request: I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 Feb 21 19:34:00 fc35 kernel: Buffer I/O error on dev loop0, logical block 0, async page read Feb 21 19:34:00 fc35 kernel: BTRFS warning (device sda8): csum failed root 256 ino 257 off 0 csum 0xe05b8b2e expected csum 0xc90f1f63 mirror 1 Feb 21 19:34:00 fc35 kernel: BTRFS error (device sda8): bdev /dev/sda8 errs: wr 0, rd 0, flush 0, corrupt 154, gen 0 Feb 21 19:34:00 fc35 kernel: blk_update_request: I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 Feb 21 19:34:00 fc35 kernel: Buffer I/O error on dev loop0, logical block 0, async page read Feb 21 19:34:00 fc35 kernel: BTRFS warning (device sda8): csum failed root 256 ino 257 off 0 csum 0xe05b8b2e expected csum 0xc90f1f63 mirror 1 Feb 21 19:34:00 fc35 kernel: BTRFS error (device sda8): bdev /dev/sda8 errs: wr 0, rd 0, flush 0, corrupt 155, gen 0 Feb 21 19:34:00 fc35 kernel: blk_update_request: I/O error, dev loop0, sector 0 op 0x0:(READ) flags 0x0 phys_seg 1 prio class 0 Feb 21 19:34:00 fc35 kernel: Buffer I/O error on dev loop0, logical block 0, async page read On Sunday, February 21, 2021, 1:48:52 PM PST, Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote: On Sun, Feb 21, 2021 at 2:34 PM Chris Murphy <lists@xxxxxxxxxxxxxxxxx> wrote: > > On Sun, Feb 21, 2021 at 2:16 PM George R Goffe via test > <test@xxxxxxxxxxxxxxxxxxxxxxx> wrote: > > > > fc35-bash 5.1 ~# mount -t ext4 -o loop,ro /ext2_saved/image /ext4 > > mount: /ext4: can't read superblock on /dev/loop0. > > Hmm. That's unexpected though. I'm going to try it in a VM. It should work. Works for me. But I'm confused by your paths, i.e. are you really creating /ext2_saved and /ext4 in the root directory? Assume root user: mount /dev/vdb /mnt/btrfs mount -t ext4 -o ro,loop /mnt/btrfs/ext2_saved/image /mnt/ext4 That works for me. But you could alternatively try: mount /dev/vdb /mnt/btrfs losetup -r /dev/loop0 /mnt/btrfs/ext2_saved/image blkid /dev/loop0 What file system does libblkid think it is? Could be ext2, ext3, or ext4, in which case mount -t ext4 exclusively mounts ext4 and will otherwise fail. -- Chris Murphy _______________________________________________ test mailing list -- test@xxxxxxxxxxxxxxxxxxxxxxx To unsubscribe send an email to test-leave@xxxxxxxxxxxxxxxxxxxxxxx Fedora Code of Conduct: https://docs.fedoraproject.org/en-US/project/code-of-conduct/ List Guidelines: https://fedoraproject.org/wiki/Mailing_list_guidelines List Archives: https://lists.fedoraproject.org/archives/list/test@xxxxxxxxxxxxxxxxxxxxxxx Do not reply to spam on the list, report it: https://pagure.io/fedora-infrastructure
