linux-kernel - Re: [LTP] [linus:master] [iomap] 219580eea1: ltp.writev07.fail

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Message-ID: <ZLAUT_19ST-47Wed@yuki>
Date:   Thu, 13 Jul 2023 17:12:15 +0200
From:   Cyril Hrubis <chrubis@...e.cz>
To:     kernel test robot <oliver.sang@...el.com>
Cc:     Christoph Hellwig <hch@....de>,
        "Darrick J. Wong" <djwong@...nel.org>,
        Andreas Gruenbacher <agruenba@...hat.com>,
        Miklos Szeredi <miklos@...redi.hu>,
        Matthew Wilcox <willy@...radead.org>, cluster-devel@...hat.com,
        Ilya Dryomov <idryomov@...il.com>,
        Miklos Szeredi <mszeredi@...hat.com>,
        Chao Yu <chao@...nel.org>, linux-fsdevel@...r.kernel.org,
        Al Viro <viro@...iv.linux.org.uk>,
        Jaegeuk Kim <jaegeuk@...nel.org>, Xiubo Li <xiubli@...hat.com>,
        Trond Myklebust <trond.myklebust@...merspace.com>,
        ltp@...ts.linux.it, lkp@...el.com, Jens Axboe <axboe@...nel.dk>,
        Christian Brauner <brauner@...nel.org>,
        Theodore Ts'o <tytso@....edu>,
        Johannes Thumshirn <johannes.thumshirn@....com>,
        linux-kernel@...r.kernel.org, linux-xfs@...r.kernel.org,
        Anna Schumaker <anna@...nel.org>, oe-lkp@...ts.linux.dev,
        Andrew Morton <akpm@...ux-foundation.org>,
        Hannes Reinecke <hare@...e.de>
Subject: Re: [LTP] [linus:master] [iomap]  219580eea1: ltp.writev07.fail

Hi!
The test description:

 Verify writev() behaviour with partially valid iovec list.
 Kernel <4.8 used to shorten write up to first bad invalid
 iovec. Starting with 4.8, a writev with short data (under
 page size) is likely to get shorten to 0 bytes and return
 EFAULT.

 This test doesn't make assumptions how much will write get
 shortened. It only tests that file content/offset after
 syscall corresponds to return value of writev().

 See: [RFC] writev() semantics with invalid iovec in the middle
      https://marc.info/?l=linux-kernel&m=147388891614289&w=2

-- 
Cyril Hrubis
chrubis@...e.cz