3de8d1cf6e52dbd6edb8331b6a6b186e6c860646
Because pipes have no file position. VFS maintained (file) offsets into a buffer internal to PFS and stored them in vnodes for simplicity, mixing the responsibilities of filp and vnode objects. With this patch PFS ignores the position field in REQ_READ and REQ_WRITE requests making VFS' job a lot simpler.
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