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1fc548b63a
This flag allows disabling the mincore() syscall introduced in
50fc48ac47. On older ZFS filesystems,
mincore() may trigger a bug related to ZFSÕs own in-memory cache. Mixing
reads from mmap()ed files and direct disk reads can corrupt the ZFS ARC
cache and lead to data read corruption.
Fixes https://github.com/VictoriaMetrics/VictoriaMetrics/issues/10327
25 lines
477 B
Go
25 lines
477 B
Go
//go:build linux
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package fs
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import (
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"unsafe"
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"golang.org/x/sys/unix"
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"github.com/VictoriaMetrics/VictoriaMetrics/lib/logger"
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)
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func supportsMincore() bool {
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return true
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}
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func mincore(ptr *byte) bool {
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var result [1]byte
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_, _, err := unix.Syscall(unix.SYS_MINCORE, uintptr(unsafe.Pointer(ptr)), 1, uintptr(unsafe.Pointer(&result[0])))
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if err != 0 {
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logger.Panicf("FATAL: cannot call mincore(ptr=%p, 1): %s", ptr, err)
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}
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ok := (result[0] & 1) == 1
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return ok
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}
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