f05b8af71e
Avoid calling sdgetdev() for every I/O. Instead, put the SDunit pointer for #S/sdXX/* files in Chan.aux and keep a reference to SDev between sdopen()/sdclose(). This avoids having to do the sdindex() lookup and qlock(),incref(),decref() on every read/write operation. Removal of SDev's is quite rare and only can happen with pcmcia ide controllers, and i assume that for that we can assume thet fileservers having been exited properly and closed their files before we attempt to remove a device. The rest is improving waserror() codepaths, making sure we release the locks for any of the interface callbacks (verify/online). Also get rid of tas() and instead only change the unit's rawopen flag while holding raw qlock. |
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