Qu Wenruo 60651ad9da btrfs-progs: introduce OPEN_CTREE_ALLOW_TRANSID_MISMATCH flag ... [BUG] There is a report that, btrfstune can even work while the fs has transid mismatch problems. $ btrfstune -f -u /dev/sdb1 Current fsid: b2b5ae8d-4c49-45f0-b42e-46fe7dcfcb07 New fsid: b2b5ae8d-4c49-45f0-b42e-46fe7dcfcb07 Set superblock flag CHANGING_FSID Change fsid in extents parent transid verify failed on 792854528 wanted 20103 found 20091 parent transid verify failed on 792854528 wanted 20103 found 20091 parent transid verify failed on 792854528 wanted 20103 found 20091 Ignoring transid failure parent transid verify failed on 792870912 wanted 20103 found 20091 parent transid verify failed on 792870912 wanted 20103 found 20091 parent transid verify failed on 792870912 wanted 20103 found 20091 Ignoring transid failure parent transid verify failed on 792887296 wanted 20103 found 20091 parent transid verify failed on 792887296 wanted 20103 found 20091 parent transid verify failed on 792887296 wanted 20103 found 20091 Ignoring transid failure ERROR: child eb corrupted: parent bytenr=38010880 item=69 parent level=1 child level=1 ERROR: failed to change UUID of metadata: -5 ERROR: btrfstune failed This leaves a corrupted fs even more corrupted, and due to the extra CHANGING_FSID flag, btrfs check will not even try to run on it: Opening filesystem to check... ERROR: Filesystem UUID change in progress ERROR: cannot open file system [CAUSE] Unlike kernel, btrfs-progs has a less strict check on transid mismatch. In read_tree_block() we will fall back to use the tree block even its transid mismatch if we can't find any better copy. However not all commands in btrfs-progs needs this feature, only btrfs-check (which may fix the problem) and btrfs-restore (it just tries to ignore any problems) really utilize this feature. [FIX] Introduce a new open ctree flag, OPEN_CTREE_ALLOW_TRANSID_MISMATCH, to be explicit about whether we really want to ignore transid error. Currently only btrfs-check and btrfs-restore will utilize this new flag. Also add btrfs-image to allow opening such fs with transid error. Link: https://www.reddit.com/r/btrfs/comments/pivpqk/failure_during_btrfstune_u/ Signed-off-by: Qu Wenruo <wqu@suse.com> Signed-off-by: David Sterba <dsterba@suse.com>		2021-09-20 12:17:29 +02:00
..
main.c	btrfs-progs: introduce OPEN_CTREE_ALLOW_TRANSID_MISMATCH flag	2021-09-20 12:17:29 +02:00
Makefile	btrfs-progs: build: add stub makefile to image and mkfs	2019-07-04 15:36:01 +02:00
metadump.h	btrfs-progs: image: introduce framework for more dump versions	2021-08-25 15:38:53 +02:00
sanitize.c	btrfs-progs: move extent_io.c to kernel-shared/	2020-08-31 17:01:04 +02:00
sanitize.h	btrfs-progs: image: move sanitization to new file	2017-11-14 15:59:00 +01:00