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a765a34a31
In illumos-gate, `zvol_read` and `zvol_write` are both passed uio_t rather than bio_t. Since we are translating from bio to uio for both, we might as well unify the logic and have code more similar to its illumos counterpart. At the same time, we can fix some regressions that occurred versus the original code from illumos-gate. We refactor zvol_write to take uio and also correct the following problems: 1. We did `dnode_hold()` on each IO when we already had a hold. 2. We would attempt to send writes that exceeded `DMU_MAX_ACCESS` to the DMU. 3. We could call `zil_commit()` twice. In this case, this is because Linux uses the `->write` function to send flushes and can aggregate the flush with a write. If a synchronous write occurred with the flush, we effectively flushed twice when there is no need to do that. zvol_read also suffers from the first two problems. Other platforms suffer from the first, so we leave that for a second patch so that there is a discrete patch for them to cherry-pick. Signed-off-by: Richard Yao <ryao@gentoo.org> Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Tim Chase <tim@chase2k.com> Signed-off-by: Chunwei Chen <tuxoko@gmail.com> Closes #4316 |
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Native ZFS for Linux!
ZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the Illumos community.
ZFS on Linux, which is also known as ZoL, is currently feature complete. It includes fully functional and stable SPA, DMU, ZVOL, and ZPL layers.
Full documentation for installing ZoL on your favorite Linux distribution can be found at: http://zfsonlinux.org