ed97b4447d
This change should wrap up the last of the missing block device support in the vdev_disk layer. With this change I can now successfully create and use zpools which are layered on top of md and lvm virtual devices. The following changes include: 1) The big one, properly handle the case when page cannot be added to a bio due to dynamic limitation of a merge_bdev handler. For example the md device will limit a bio to the configured stripe size. Our bio size may also end up being limited by the maximum request size, and other factors determined during bio construction. To handle all of the above cases the code has been updated to handle failures from bio_add_page(). This had been hardcoded to never fail for the prototype proof of concept implementation. In the case of a failure the number of bytes which still need to be added to a bio are returned. New bio's are allocated and attached to the dio until the entire data buffer is mapped to bios. It is then submitted as before to the request queue, and once all the bio's attached to a dio have finished the completion callback is run. 2) The devid comments have been removed because it is not clear to me that we will not need devid support. They have been replaced with a comment explaining that udev can and should be used. |
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| avl | ||
| nvpair | ||
| unicode | ||
| zcommon | ||
| zfs | ||
| Makefile.in | ||