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clamp kernel dump compression level when using gzip

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If the configured compression level for kernel dumps
it outside the supported range, clamp it to the closest
supported level.  Previously, dumpon would fail.

zstd already does this internally, so the compressor
needs no change.

Reviewed by:	cem markj
MFC after:	2 weeks
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D23765
This commit is contained in:
Eric van Gyzen 2020-02-20 23:53:48 +00:00
parent 3ae8839afe
commit 3cd1f28e4a
1 changed files with 7 additions and 0 deletions
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7
sys/kern/subr_compressor.c
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@ -117,6 +117,13 @@ gz_init(size_t maxiosize, int level)
s->gz_stream.next_in = Z_NULL;
s->gz_stream.avail_in = 0;
if (level != Z_DEFAULT_COMPRESSION) {
if (level < Z_BEST_SPEED)
level = Z_BEST_SPEED;
else if (level > Z_BEST_COMPRESSION)
level = Z_BEST_COMPRESSION;
}
error = deflateInit2(&s->gz_stream, level, Z_DEFLATED, -MAX_WBITS,
DEF_MEM_LEVEL, Z_DEFAULT_STRATEGY);
if (error != 0)