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Remove some dead ARC code. (#14340)

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Every ARC buffer holds a reference on the header. It means headers with
buffers are never evictable.  When we are evicting a header, there can
be no more buffers to free.  Just assert that.

b_evict_lock seems not protecting anything now.  Remove it.

Buffers checksum should also be freed with the last uncompressed buffer,
so it should not be there also when we are evicting the header.

Signed-off-by:  Alexander Motin <mav@FreeBSD.org>
Sponsored by:   iXsystems, Inc.
This commit is contained in:
Alexander Motin
2023-01-09 13:45:17 -05:00
committed by GitHub
parent a0105f6cd4
commit 289f7e6adb
2 changed files with 26 additions and 75 deletions
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include/sys/arc.h
-1
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@@ -195,7 +195,6 @@ typedef enum arc_buf_flags {
struct arc_buf {
arc_buf_hdr_t *b_hdr;
arc_buf_t *b_next;
kmutex_t b_evict_lock;
void *b_data;
arc_buf_flags_t b_flags;
};