mke2fs: allow file systems w/ uninit_bg to be recovered with mke2fs -S
The command mke2fs -S is used as a last ditch recovery command to
write new superblock and block group descriptors, but _not_ to destroy
the inode table in hopes of recovering from a badly corrupted file
system. If the uninit_bg feature is enabled, we need to make sure to
clear the unused inodes count field in the block group descriptors or
else e2fsck -fy will leave the file system completely empty.
Thanks to Akira Fujita for reporting this problem.
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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