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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 <[email protected]>
Signed-off-by: Alexander Motin <[email protected]>
Closes #18055
This commit is contained in:
Alexander Motin authored and GitHub committed 2025-12-15 14:52:44 -08:00
1 parent 3b1ff816bd
commit 22e89aca88
1 file changed
+4 -3
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module/zfs/ddt_zap.c
+4 -3
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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);