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btrfs-progs: super-recover: fix the broken sb detection 

Commit 3296d058b7 ("btrfs-progs: super-recover: Reuse
 btrfs_read_dev_super function") changed the logic when a superblock
is added to the bad block list to depend on -EIO. However currently
btrfs_read_dev_super doesn't return -EIO when the fist super block
is broken. Instead it returns -1. This causes the super-recovery
logic to miss the fact that the first super block is completely broken.

Fix this by considering any error code from btrfs_read_dev_super other
than -ENOENT to mean that the super block is corrupted. -ENOENT
means that the superblock copy is not part of the fs i.e. it's smaller
than the offset of the block. This can only occur for the 2nd copy at
256gb mark.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2017-12-05 10:39:49 +02:00 committed by David Sterba
parent 90a16b10b3
commit 4487aa64e7
1 changed files with 1 additions and 1 deletions
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2
super-recover.c
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@ -136,7 +136,7 @@ read_dev_supers(char *filename, struct btrfs_recover_superblock *recover)
max_gen = btrfs_super_generation(sb);
if (max_gen > recover->max_generation)
recover->max_generation = max_gen;
} else if (ret == -EIO){
} else if (ret != -ENOENT){
/*
* Skip superblock which doesn't exist, only adds
* really corrupted superblock