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Fri, 24 Jul 2020 15:52:55 +0000 (GMT) From: Kanchan Joshi To: axboe@kernel.dk, viro@zeniv.linux.org.uk, bcrl@kvack.org Cc: willy@infradead.org, hch@infradead.org, Damien.LeMoal@wdc.com, asml.silence@gmail.com, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org, linux-aio@kvack.org, io-uring@vger.kernel.org, linux-block@vger.kernel.org, linux-api@vger.kernel.org, Kanchan Joshi , Selvakumar S , Nitesh Shetty , Javier Gonzalez Subject: [PATCH v4 1/6] fs: introduce FMODE_ZONE_APPEND and IOCB_ZONE_APPEND Date: Fri, 24 Jul 2020 21:19:17 +0530 Message-Id: <1595605762-17010-2-git-send-email-joshi.k@samsung.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1595605762-17010-1-git-send-email-joshi.k@samsung.com> X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFlrNKsWRmVeSWpSXmKPExsWy7bCmhu5dLul4gzMnbCx+T5/CajFn1TZG i9V3+9ksuv5tYbFobf/GZHF6wiImi3et51gsHt/5zG5x9P9bNosp05oYLTZ/72Cz2HtL22LP 3pMsFpd3zWGz2PZ7PrPFlSmLmC1e/zjJZnH+73FWi98/5rA5CHvsnHWX3WPzCi2Py2dLPTZ9 msTu0bdlFaPH501yHu0Hupk8Nj15yxTAEcVlk5Kak1mWWqRvl8CVcbT3NGvBNLGKT61n2BsY lwh1MXJySAiYSCxfdZ2li5GLQ0hgN6PE+v5OVpCEkMAnRomv9/kgEt8YJR4t2sgM09H/fgUz RGIvo8Thj2eh2j8zSjzd9R4ow8HBJqApcWFyKYgpImAjsXOJCkgvs8ByZon1a3lBbGEBH4nH QJ+D2CwCqhLXfqwG6+QVcJbY90AHYpWcxM1znWBrOQVcJC5cvMsIsklCYAuHRNu8fWwQRS4S L38cZYSwhSVeHd/CDmFLSXx+txeqplji152jzBDNHYwS1xtmskAk7CUu7vnLBLKYGejk9bv0 IcKyElNPrWOCuJlPovf3EyaIOK/EjnkwtqLEvUlPWSFscYmHM5ZA2R4S37+2s0GCZDqjxJLJ G5gmMMrNQlixgJFxFaNkakFxbnpqsWmBUV5quV5xYm5xaV66XnJ+7iZGcHrS8trB+PDBB71D jEwcjIcYJTiYlUR4V3yTihfiTUmsrEotyo8vKs1JLT7EKM3BoiTOq/TjTJyQQHpiSWp2ampB ahFMlomDU6qB6UDjyR2PD508xReTK/AmPyTjBdMF6R0rxKuELvwyTd5y5f70lHL9tP2Kma9D FA5Objw7X+hC7zJnecZVrz0M82s/OW5Zoq0S47Bv6oycY5N5tGZ2Tzv0ztdPemas6NIHxnv4 lfSL3v6K8vvSmHJwzfot65M4248J6vbw+ZfYnEltafcL6rhStlUqyPZhU/LDScXKtdZ1tbxb GZczbGQRcHnepFa9IurkDr43jhM3T/mbc/Rc0XeTmbnLNVf/2lD7Pl/hmJ5ab+6SSY5vOmbv eyI1/7bg8a97qpR6v7bd19P/Uq8woetAdsuCs7Er3y3brH9S+rPJy4eMFyvmPpP78voN6+nH y5vedS9bnSZpdFKJpTgj0VCLuag4EQBqgvrTvgMAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFrrDLMWRmVeSWpSXmKPExsWy7bCSnO4tZul4g2t95ha/p09htZizahuj xeq7/WwWXf+2sFi0tn9jsjg9YRGTxbvWcywWj+98Zrc4+v8tm8WUaU2MFpu/d7BZ7L2lbbFn 70kWi8u75rBZbPs9n9niypRFzBavf5xkszj/9zirxe8fc9gchD12zrrL7rF5hZbH5bOlHps+ TWL36NuyitHj8yY5j/YD3Uwem568ZQrgiOKySUnNySxLLdK3S+DKONp7mrVgmljFp9Yz7A2M S4S6GDk5JARMJPrfr2AGsYUEdjNKfLiaCxEXl2i+9oMdwhaWWPnvOZDNBVTzkVFizaUdQA4H B5uApsSFyaUgNSICDhJdxx8zgdQwC2xnlvj+Zj4bSEJYwEfiMdCDIDaLgKrEtR+rmUF6eQWc JfY90IGYLydx81wn2A2cAi4SFy7eZQQpEQIqufijfAIj3wJGhlWMkqkFxbnpucWGBYZ5qeV6 xYm5xaV56XrJ+bmbGMERoKW5g3H7qg96hxiZOBgPMUpwMCuJ8K74JhUvxJuSWFmVWpQfX1Sa k1p8iFGag0VJnPdG4cI4IYH0xJLU7NTUgtQimCwTB6dUAxPPYr17/urfnZ7MnDjp2V33i27v 1dKZH6y2nHTAIfsMz9kVXq/essTdOj1Jcd0j3bUb0yQfrvjtVZb0eMPKz6teyhdpcGrr/Zit aj0vgOvp2cBO6zTfia/rsgUYFgbKr/dOmjXtMv8rmdqJ/c8Tf6TxRKac/hu8Izm4ahpH5Tzf 44FXjJIenG6a4LFGgMPU/5Xu/ST7nj159ptcVocL2bkketl6eUc4Zl2c9mTGhZtWv0Xqcs3n aurp7/Ce8Hh6h6rxf49fPI3H/J3e395d/Eo4chPrySar69kXOBeEMX3ZkcAnb52csEDtZviO R2/OKE7coizwLv8sw1OuyQrdp+bK/Xv8xtq9cuHnjmVhc9YqsRRnJBpqMRcVJwIAIwT+6e8C AAA= X-CMS-MailID: 20200724155258epcas5p1a75b926950a18cd1e6c8e7a047e6c589 X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P X-CMS-RootMailID: 20200724155258epcas5p1a75b926950a18cd1e6c8e7a047e6c589 References: <1595605762-17010-1-git-send-email-joshi.k@samsung.com> Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org Enable zone-append using existing O_APPEND and RWF_APPEND. Zone-append is similar to appending writes, but requires written-location to be returned, in order to be effective. Returning completion-result requires bit of additional processing in common path. Also, we guarantee that zone-append does not cause a short write, which is not the case with regular appending-write. Therefore make the feature opt-in by introducing new FMODE_ZONE_APPEND mode (kernel-only) and IOCB_ZONE_APPEND flag. When a file is opened, it can opt in for zone-append by setting FMODE_ZONE_APPEND. If file has opted in, and receives write that meets file-append criteria (RWF_APPEND write or O_APPEND open), set IOCB_ZONE_APPEND in kiocb->ki_flag, apart from existing IOCB_APPEND. IOCB_ZONE_APPEND is meant to isolate the code that returns written-location with appending write. Signed-off-by: Kanchan Joshi Signed-off-by: Selvakumar S Signed-off-by: Nitesh Shetty Signed-off-by: Javier Gonzalez --- include/linux/fs.h | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/include/linux/fs.h b/include/linux/fs.h index 6c4ab4d..ef13df4 100644 --- a/include/linux/fs.h +++ b/include/linux/fs.h @@ -175,6 +175,9 @@ typedef int (dio_iodone_t)(struct kiocb *iocb, loff_t offset, /* File does not contribute to nr_files count */ #define FMODE_NOACCOUNT ((__force fmode_t)0x20000000) +/* File can support zone-append */ +#define FMODE_ZONE_APPEND ((__force fmode_t)0x40000000) + /* * Flag for rw_copy_check_uvector and compat_rw_copy_check_uvector * that indicates that they should check the contents of the iovec are @@ -315,6 +318,7 @@ enum rw_hint { #define IOCB_SYNC (1 << 5) #define IOCB_WRITE (1 << 6) #define IOCB_NOWAIT (1 << 7) +#define IOCB_ZONE_APPEND (1 << 8) struct kiocb { struct file *ki_filp; @@ -3427,8 +3431,11 @@ static inline bool vma_is_fsdax(struct vm_area_struct *vma) static inline int iocb_flags(struct file *file) { int res = 0; - if (file->f_flags & O_APPEND) + if (file->f_flags & O_APPEND) { res |= IOCB_APPEND; + if (file->f_mode & FMODE_ZONE_APPEND) + res |= IOCB_ZONE_APPEND; + } if (file->f_flags & O_DIRECT) res |= IOCB_DIRECT; if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host)) @@ -3454,8 +3461,11 @@ static inline int kiocb_set_rw_flags(struct kiocb *ki, rwf_t flags) ki->ki_flags |= IOCB_DSYNC; if (flags & RWF_SYNC) ki->ki_flags |= (IOCB_DSYNC | IOCB_SYNC); - if (flags & RWF_APPEND) + if (flags & RWF_APPEND) { ki->ki_flags |= IOCB_APPEND; + if (ki->ki_filp->f_mode & FMODE_ZONE_APPEND) + ki->ki_flags |= IOCB_ZONE_APPEND; + } return 0; } -- 2.7.4