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Illumos 6214 - zpools going south

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6214 zpools going south
Reviewed by: Igor Kozhukhov <ikozhukhov@gmail.com>
Reviewed by: George Wilson <george.wilson@delphix.com>
Reviewed by: Dan McDonald <danmcd@omniti.com>
Reviewed by: Saso Kiselkov <skiselkov.ml@gmail.com>

References:
  https://www.illumos.org/issues/6214
  http://cr.illumos.org/~webrev/sensille/6214_zpools_going_south/

Porting Notes:

Reintroduce b_compress to the l2arc_buf_hdr_t.  In commit b9541d6
the compression flags were moved to the generic b_flags in the
arc_buf_hdr_t.  This is a problem because l2arc_compress_buf()
may manipulate the compression flags and this can only be done
safely under the hash lock which is not held.  See Illumos 6214
for a detailed analysis of the race.

HDR_GET_COMPRESS() macro was removed from arc_buf_info().

Ported-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #3757
This commit is contained in:
Arne Jansen
2015-09-11 09:18:56 -07:00
committed by Brian Behlendorf
parent 9965059ab9
commit 4e0f33ffe0
3 changed files with 16 additions and 34 deletions
Download Patch File Download Diff File Expand all files Collapse all files
include/sys/arc_impl.h
+1
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@@ -187,6 +187,7 @@ typedef struct l2arc_buf_hdr {
/* real alloc'd buffer size depending on b_compress applied */
uint32_t b_hits;
int32_t b_asize;
uint8_t b_compress;
list_node_t b_l2node;
} l2arc_buf_hdr_t;