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Wire O_DIRECT also to Uncached I/O (#17218)

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Before Direct I/O was implemented, I've implemented lighter version
I called Uncached I/O.  It uses normal DMU/ARC data path with some
optimizations, but evicts data from caches as soon as possible and
reasonable.  Originally I wired it only to a primarycache property,
but now completing the integration all the way up to the VFS.

While Direct I/O has the lowest possible memory bandwidth usage,
it also has a significant number of limitations.  It require I/Os
to be page aligned, does not allow speculative prefetch, etc.  The
Uncached I/O does not have those limitations, but instead require
additional memory copy, though still one less than regular cached
I/O.  As such it should fill the gap in between.  Considering this
I've disabled annoying EINVAL errors on misaligned requests, adding
a tunable for those who wants to test their applications.

To pass the information between the layers I had to change a number
of APIs.  But as side effect upper layers can now control not only
the caching, but also speculative prefetch.  I haven't wired it to
VFS yet, since it require looking on some OS specifics.  But while
there I've implemented speculative prefetch of indirect blocks for
Direct I/O, controllable via all the same mechanisms.

Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Fixes #17027
Reviewed-by: Rob Norris <robn@despairlabs.com>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Alexander Motin
2025-05-13 17:26:55 -04:00
committed by GitHub
parent e2ba0f7643
commit 734eba251d
35 changed files with 397 additions and 294 deletions
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include/sys/dmu_impl.h
+6 -4
View File
@@ -270,11 +270,13 @@ void dmu_object_zapify(objset_t *, uint64_t, dmu_object_type_t, dmu_tx_t *);
void dmu_object_free_zapified(objset_t *, uint64_t, dmu_tx_t *);
int dmu_write_direct(zio_t *, dmu_buf_impl_t *, abd_t *, dmu_tx_t *);
int dmu_read_abd(dnode_t *, uint64_t, uint64_t, abd_t *, uint32_t flags);
int dmu_write_abd(dnode_t *, uint64_t, uint64_t, abd_t *, uint32_t, dmu_tx_t *);
int dmu_read_abd(dnode_t *, uint64_t, uint64_t, abd_t *, dmu_flags_t);
int dmu_write_abd(dnode_t *, uint64_t, uint64_t, abd_t *, dmu_flags_t,
dmu_tx_t *);
#if defined(_KERNEL)
int dmu_read_uio_direct(dnode_t *, zfs_uio_t *, uint64_t);
int dmu_write_uio_direct(dnode_t *, zfs_uio_t *, uint64_t, dmu_tx_t *);
int dmu_read_uio_direct(dnode_t *, zfs_uio_t *, uint64_t, dmu_flags_t);
int dmu_write_uio_direct(dnode_t *, zfs_uio_t *, uint64_t, dmu_flags_t,
dmu_tx_t *);
#endif
#ifdef __cplusplus