[PATCH] Fix cramfs metadata races
There's a few places that use incorrect exclusion for the cramfs raw data access buffers. The proper lock is "read_mutex" (and BKL does nothing). - fix mount-time read and block number initialization without the mutex held. - cramfs_readdir() needs to copy the name and inode information into a separate buffer since it can't hold the semaphore over the (potentially blocking) user mode access - cramfs_lookup() needs to hold the access lock over the whole function, not just the read itself - use generic_file_llseek on directories to get i_sem exclusion on readdir/lseek
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