off-by-one uncompressed invalid ram_bytes corruptions

[Steve Leung <sjleung@shaw.ca>]

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Hi list,

I've got 3-device raid1 btrfs filesystem that's throwing up some
"corrupt leaf" errors in dmesg.  This is a uniquified list I've
observed lately:

   BTRFS critical (device sda1): corrupt leaf: root=1 
block=4970196795392 slot=307 ino=206231 file_offset=0, invalid ram_bytes 
for uncompressed inline extent, have 3468 expect 3469
   BTRFS critical (device sda1): corrupt leaf: root=1 
block=4970552426496 slot=91 ino=209736 file_offset=0, invalid ram_bytes 
for uncompressed inline extent, have 3496 expect 3497
   BTRFS critical (device sda1): corrupt leaf: root=1 
block=4970712399872 slot=221 ino=205230 file_offset=0, invalid ram_bytes 
for uncompressed inline extent, have 1790 expect 1791
   BTRFS critical (device sda1): corrupt leaf: root=1 
block=4970803920896 slot=368 ino=205732 file_offset=0, invalid ram_bytes 
for uncompressed inline extent, have 2475 expect 2476
   BTRFS critical (device sda1): corrupt leaf: root=1 
block=4970987945984 slot=236 ino=208896 file_offset=0, invalid ram_bytes 
for uncompressed inline extent, have 490 expect 491

All of them seem to be 1 short of the expected value.

Some files do seem to be inaccessible on the filesystem, and btrfs
inspect-internal on any of those inode numbers fails with:

  ERROR: ino paths ioctl: Input/output error

and another message for that inode appears.

'btrfs check' (output attached) seems to notice these corruptions (among 
a few others, some of which seem to be related to a problematic attempt 
to build Android I posted about some months ago).

Other information:

Arch Linux x86-64, kernel 4.16.6, btrfs-progs 4.16.  The filesystem has 
about 25 snapshots at the moment, only a handful of compressed files, 
and nothing fancy like qgroups enabled.

btrfs fi show:

  Label: none  uuid: 9d4db9e3-b9c3-4f6d-8cb4-60ff55e96d82
          Total devices 4 FS bytes used 2.48TiB
          devid    1 size 1.36TiB used 1.13TiB path /dev/sdd1
          devid    2 size 464.73GiB used 230.00GiB path /dev/sdc1
          devid    3 size 1.36TiB used 1.13TiB path /dev/sdb1
          devid    4 size 3.49TiB used 2.49TiB path /dev/sda1

btrfs fi df:

  Data, RAID1: total=2.49TiB, used=2.48TiB
  System, RAID1: total=32.00MiB, used=416.00KiB
  Metadata, RAID1: total=7.00GiB, used=5.29GiB
  GlobalReserve, single: total=512.00MiB, used=0.00B

dmesg output attached as well.

Thanks in advance for any assistance!  I have backups of all the 
important stuff here but it would be nice to fix the corruptions in place.

Steve

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