d34b0a1bac
In msdosfs_read(), mainly reorder the main loop to the same order as in ffs_read(). In msdosfs_write() and extendfile(), use vfs_bio_clrbuf() instead of clrbuf(). I think this just just a bogus optimization, but ffs always does it and msdosfs already did it in one place, and it is what I've tested. In msdosfs_write(), merge good bits from a comment in ffs_write(), and fix 1 style bug. In the main comment for msdosfs_pcbmap(), improve wording and catch up with 13 years of changes in the function. This comment belongs in VOP_BMAP.9 but that doesn't exist. In msdosfs_bmap(), return EFBIG if the requested cluster number is out of bounds instead of blindly truncating it, and fix many style bugs. Approved by: re (hrs)
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