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0bfd3e1078
1) ufs_load_cylinder() should return NULL on ufs_read_cylinder() failures. ufs_error() is not enough. As it is, IO failure on attempt to read a part of cylinder group metadata is likely to end up with an oops. 2) we drop the wrong buffer heads when undoing sb_bread() on IO failure halfway through the read - we need to brelse() what we've got from sb_bread(), TYVM... Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>