Finix1979 320f0c6022 Add Linux posix_fadvise support ... The purpose of this PR is to accepts fadvise ioctl from userland to do read-ahead by demand. It could dramatically improve sequential read performance especially when primarycache is set to metadata or zfs_prefetch_disable is 1. If the file is mmaped, generic_fadvise is also called for page cache read-ahead besides dmu_prefetch. Only POSIX_FADV_WILLNEED and POSIX_FADV_SEQUENTIAL are supported in this PR currently. Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov> Signed-off-by: Finix Yan <yancw@info2soft.com> Closes #13694		2022-09-08 10:29:41 -07:00
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freebsd	FreeBSD: add kqfilter support for zvol cdev	2022-09-06 09:49:33 -07:00
linux	Add Linux posix_fadvise support	2022-09-08 10:29:41 -07:00