Messages in this thread | | | Date | Thu, 18 Dec 2014 13:22:20 +0100 | From | leroy christophe <> | Subject | Re: algif_hash: splice of data > 2**16 |
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Le 18/12/2014 13:15, Stephan Mueller a écrit : > Hi Herbert, > > While testing the vmsplice/splice interface of algif_hash I was made > aware of the problem that data blobs larger than 16 pages do not seem to > be hashed properly. > > For testing, a file is mmap()ed and handed to vmsplice / splice. If the > file is smaller than 2**16, the interface returns the proper hash. > However, when the file is larger, only the first 2**16 bytes seem to be > used. > > When adding printk's to hash_sendpage, I see that this function is > invoked exactly 16 times where the first 15 invocations have the > MSG_MORE flag set and the last invocation does not have MSG_MORE. > > Hi Stephan,
I have already noticed the same issue and proposed a patch, but I never got any feedback and it has never been merged, allthought I pinged it a few times.
See https://lkml.org/lkml/2014/4/18/276
Christophe
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