ext4: add checks of block references for non-extent inodes
Check block references in the inode and indorect blocks for non-extent inodes to make sure they are valid, and flag an error if they are invalid. Signed-off-by: NThiemo Nagel <thiemo.nagel@ph.tum.de> Signed-off-by: N"Theodore Ts'o" <tytso@mit.edu>
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