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DDT: Fix compressed entry buffer size

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The first byte of the entry after compression is used for algorithm
and byte order flag.  We should decrement when calling compression/
decompression algorithm.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by: Alexander Motin <alexander.motin@TrueNAS.com>
Closes #18055
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Alexander Motin 2025-12-15 17:52:44 -05:00 committed by GitHub
parent 3b1ff816bd
commit 22e89aca88
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1 changed files with 4 additions and 3 deletions
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7
module/zfs/ddt_zap.c
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@ -57,7 +57,7 @@ ddt_zap_compress(const void *src, uchar_t *dst, size_t s_len, size_t d_len)
/* Call compress function directly to avoid hole detection. */
abd_t sabd, dabd;
abd_get_from_buf_struct(&sabd, (void *)src, s_len);
abd_get_from_buf_struct(&dabd, dst, d_len);
abd_get_from_buf_struct(&dabd, dst, d_len - 1);
c_len = ci->ci_compress(&sabd, &dabd, s_len, d_len - 1, ci->ci_level);
abd_free(&dabd);
abd_free(&sabd);
@ -86,9 +86,10 @@ ddt_zap_decompress(uchar_t *src, void *dst, size_t s_len, size_t d_len)
}
abd_t sabd, dabd;
abd_get_from_buf_struct(&sabd, src, s_len);
size_t c_len = s_len - 1;
abd_get_from_buf_struct(&sabd, src, c_len);
abd_get_from_buf_struct(&dabd, dst, d_len);
VERIFY0(zio_decompress_data(cpfunc, &sabd, &dabd, s_len, d_len, NULL));
VERIFY0(zio_decompress_data(cpfunc, &sabd, &dabd, c_len, d_len, NULL));
abd_free(&dabd);
abd_free(&sabd);