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| author | Al Viro <viro@zeniv.linux.org.uk> | 2022-09-15 20:20:59 -0400 |
|---|---|---|
| committer | Al Viro <viro@zeniv.linux.org.uk> | 2022-11-25 13:01:20 -0500 |
| commit | c67f1fd2b2b79299e617eca1c17f168d19e58510 (patch) | |
| tree | cd45f563ba7b14a808be949c1dea2d5b38a8d5af /lib | |
| parent | 40a86061a5619da8b2840efe1b26696077785cf1 (diff) | |
| download | linux-c67f1fd2b2b79299e617eca1c17f168d19e58510.tar.bz2 | |
csum_and_copy_to_iter(): handle ITER_DISCARD
Not hard to implement - we are not copying anything here, so
csum_and_memcpy() is not usable, but calculating a checksum
of source directly is trivial...
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/iov_iter.c | 8 |
1 files changed, 6 insertions, 2 deletions
diff --git a/lib/iov_iter.c b/lib/iov_iter.c index e9a8fc9ee8ee..020e009d71c5 100644 --- a/lib/iov_iter.c +++ b/lib/iov_iter.c @@ -1549,8 +1549,12 @@ size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *_csstate, __wsum sum, next; if (unlikely(iov_iter_is_discard(i))) { - WARN_ON(1); /* for now */ - return 0; + // can't use csum_memcpy() for that one - data is not copied + csstate->csum = csum_block_add(csstate->csum, + csum_partial(addr, bytes, 0), + csstate->off); + csstate->off += bytes; + return bytes; } sum = csum_shift(csstate->csum, csstate->off); |