btrfs: introduce mount option rescue=ignoredatacsums

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There are cases where you can end up with bad data csums because of
misbehaving applications.  This happens when an application modifies a
buffer in-flight when doing an O_DIRECT write.  In order to recover the
file we need a way to turn off data checksums so you can copy the file
off, and then you can delete the file and restore it properly later.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

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Josef Bacik 2020-10-16 11:29:19 -04:00 • committed by David Sterba

parent 42437a6386

commit 882dbe0cec

4 changed files with 25 additions and 10 deletions

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1

fs/btrfs/ctree.h

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21

fs/btrfs/disk-io.c

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12

fs/btrfs/super.c

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1

fs/btrfs/sysfs.c

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