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Brian Behlendorf bff2361aeb Linux 5.2 compat: rw_tryupgrade()

Commit torvalds/linux@46ad0840b has removed the architecture specific
rwsem source and headers leaving only the generic version.  As part
of this change the RWSEM_ACTIVE_READ_BIAS and RWSEM_ACTIVE_WRITE_BIAS
macros were moved to the private kernel/locking/rwsem.h header.
This results in a build failure because these macros were required
to implement the rw_tryupgrade() compatibility function.

In practice, this isn't a major problem because there are only a
few consumers of rw_tryupgrade() and because consumers of rw_tryupgrade
should be written to retry using rw_enter(RW_WRITER).

After auditing all of the callers only dmu_zfetch() was determined
not to perform a retry.  It has been updated in this commit to
resolve this issue.

That said, the rw_tryupgrade() functionality should be considered
for possible removal in a future release due to the difficultly
in supporting the interface.

Reviewed-by: Tomohiro Kusumi <kusumi.tomohiro@gmail.com>
Reviewed-by: Chunwei Chen <tuxoko@gmail.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #8730

2019-05-23 13:46:33 -07:00

linux

Fix zfs set atime|relatime=off|on behavior on inherited datasets

2019-05-07 10:06:30 -07:00

spl

Linux 5.2 compat: rw_tryupgrade()

2019-05-23 13:46:33 -07:00

sys

zpool import progress kstat

2019-05-09 10:08:05 -07:00

.gitignore

Create /proc/sys/kernel/spl/gitrev with git hash