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Wed, 28 Jun 2023 14:55:17 +0900 (KST) Received: from epsmtrp2.samsung.com (unknown [182.195.40.14]) by epcas5p1.samsung.com (KnoxPortal) with ESMTPA id 20230627184020epcas5p13fdcea52edead5ffa3fae444f923439e~smB9H_YYq0172101721epcas5p1r; Tue, 27 Jun 2023 18:40:20 +0000 (GMT) Received: from epsmgms1p1new.samsung.com (unknown [182.195.42.41]) by epsmtrp2.samsung.com (KnoxPortal) with ESMTP id 20230627184020epsmtrp2901427a1af9091266d00b9cedb5989bc~smB9Gzt1c2845228452epsmtrp2Q; Tue, 27 Jun 2023 18:40:20 +0000 (GMT) X-AuditID: b6c32a50-e61c07000001d785-1e-649bcb45da0a Received: from epsmtip2.samsung.com ( [182.195.34.31]) by epsmgms1p1new.samsung.com (Symantec Messaging Gateway) with SMTP id DF.39.34491.41D2B946; Wed, 28 Jun 2023 03:40:20 +0900 (KST) Received: from green245.sa.corp.samsungelectronics.net (unknown [107.99.41.245]) by epsmtip2.samsung.com (KnoxPortal) with ESMTPA id 20230627184016epsmtip27f2682562e4d83a09532283579af691c~smB5KnDhk0383803838epsmtip2d; Tue, 27 Jun 2023 18:40:16 +0000 (GMT) From: Nitesh Shetty To: Jens Axboe , Jonathan Corbet , Alasdair Kergon , Mike Snitzer , dm-devel@redhat.com, Keith Busch , Christoph Hellwig , Sagi Grimberg , Chaitanya Kulkarni , Alexander Viro , Christian Brauner Cc: martin.petersen@oracle.com, linux-scsi@vger.kernel.org, willy@infradead.org, hare@suse.de, djwong@kernel.org, bvanassche@acm.org, ming.lei@redhat.com, dlemoal@kernel.org, nitheshshetty@gmail.com, gost.dev@samsung.com, Nitesh Shetty , Vincent Fu , Anuj Gupta , linux-block@vger.kernel.org, linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, linux-nvme@lists.infradead.org, linux-fsdevel@vger.kernel.org Subject: [PATCH v13 3/9] block: add emulation for copy Date: Wed, 28 Jun 2023 00:06:17 +0530 Message-Id: <20230627183629.26571-4-nj.shetty@samsung.com> X-Mailer: git-send-email 2.35.1.500.gb896f729e2 In-Reply-To: <20230627183629.26571-1-nj.shetty@samsung.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Brightmail-Tracker: H4sIAAAAAAAAA01TaVBbVRTufS95CTjpvLJ5xVaZaHWgBpIawgVBkEXeWJ3iuMzAqDRD3gBC FrOIUm2hLLVlTwWmAU0FlLIILWAbllhMVbYq0yIgWGgdQ2cMZWuVUsJi4gPtv+983znnO+fc uVzc7WuONzdVoaXVCmk6n3BlXbjs6yuIGaqSCX9r80atgz/i6FjpOo6apkoINHv5DkAVi/dx ZO09DtCIdSe6eSkcmeer2GiitxNDPTV6DDU0/YAhvWUMoJlRA4bMk/vQF/l1LNRjHmChka5q Ahm/muGggnETger7NjBkOZWDIZM1G6ALdiOOWmYXWKh/8lH0R8EnAA2v97GRfaWaiNhDjfxy gOo0THGo4enzLKr9rB818pOOams8QVDtdUep7oksgqotPsWminLmCWppZpJFLXw7SlDFHY2A ah86TN1te4xqs85hcWRCWmgKLZXRah9akaSUpSqSw/gHXkuMSgyUCEUCUTAK4vsopHI6jB/9 cpzgxdR0x4n4Pu9L03UOKk6q0fADng9VK3Va2idFqdGG8WmVLF0lVvlrpHKNTpHsr6C1ISKh cH+gI/FQWkp7eTZLZYr84HahgZUF+iUngQsXkmKYc3WWcxK4ct3IHgBnq/UYE9wBsLzw1pay 7FA2buDbJSXTLWxGMANovFcGmCAPg5Zqp8LlEuQ+OLTJdfIeZBYOz3XXAmc1Ts7jsLbMxYnd SQnsWOjFnJhF7oWFg0uEE/PIENhT1YQ5+0AyAJbc2OWkXcjnYPfw92wmZRccOG1lMS0fhznf VOFOL0hOusBbU39izKTRcKC+n2CwO7T1dXAY7A3vzpu3+AzY8OlZginOBdAwbgCMEA7zBktw 5xA46QtbuwIYeg8sH2zBGOOdsMhu3fLiQdPn2/gJ2Nx6Zqv/I3DsXjbB7ELBn0eimFsVA7h6 upVTCnwMD+xjeGAfw//OZwDeCLxplUaeTCcFqkQCBZ3x3zMnKeVt4N9/4xdnAk3n1v0tAOMC C4BcnO/B81qplLnxZNIPM2m1MlGtS6c1FhDoOHgZ7u2ZpHR8PIU2USQOFoolEok4+FmJiP8w bzr2hMyNTJZq6TSaVtHq7TqM6+KdhX20I2BMthBrvBQ8HTVjb99dcLCsC2ijTIvI7lqx6tEG Jiqla89svjA1V56h34y8Pxpbaftdnvt2+Pm/3OqXU9z7EmTG4o9TYzKbv+vceDrx9bKA/fHX Kqre+tLDboxlExGegtjoDkH85Lz2yVdfEYS+h4RBxUc0zYsTeyMX1sjluFbbkfHjtFdN9rUV ju1mzNih4foG6GIzH0zIY8t2t9fySPOQamnVHvFGTZn5erTIXbi8Q9ywVpqveujKS3L9lc+E QdFqsddVQ2/K9V/Fb3rq85+yphUNclwLjl3823w4zb37Ym5SfN3Au0fNJ2ld0Fwmx2YKqoCb nu9sWEJu94v4LE2KVOSHqzXSfwBAUQPYwAQAAA== X-Brightmail-Tracker: H4sIAAAAAAAAA+NgFnrEIsWRmVeSWpSXmKPExsWy7bCSvK6I7uwUgycfBC3WnzrGbNE04S+z xeq7/WwWrw9/YrSY9uEns8WTA+2MFpef8Fk82G9vsffdbFaLmwd2MlnsWTSJyWLl6qNMFpMO XWO0eHp1FpPF3lvaFgvblrBY7Nl7ksXi8q45bBbzlz1lt+i+voPNYvnxf0wWhyY3M1nseNLI aLHt93xmi3Wv37NYnLglbfG4u4PR4vzf46wWv3/MYXOQ9bh8xdtj56y77B7n721k8di8Qsvj 8tlSj02rOtk8Ni+p99h9s4HNY3HfZFaP3uZ3bB4fn95i8Xi/7yqbR9+WVYwem09Xe3zeJOex 6clbpgCBKC6blNSczLLUIn27BK6MzVMbWQp2OFW86ZnF0sB4wqyLkZNDQsBEov/eOtYuRi4O IYHdjBLzX1xhg0hISiz7e4QZwhaWWPnvOTtEUTOTxJFPC1i6GDk42AS0JU7/5wCJiwh0MUt0 7nzHAuIwCzSxSNy88wqsW1jATGLL+wNMIDaLgKpEz6mPYBt4Bawk9sxezQQySEJAX6L/viBI mFPAWmL3+SOsIGEhoJL3xwMgqgUlTs58wgJiMwvISzRvnc08gVFgFpLULCSpBYxMqxglUwuK c9Nziw0LDPNSy/WKE3OLS/PS9ZLzczcxgpOBluYOxu2rPugdYmTiYDzEKMHBrCTCK/ZjeooQ b0piZVVqUX58UWlOavEhRmkOFiVxXvEXvSlCAumJJanZqakFqUUwWSYOTqkGJp2mOl+/hUf+ 7bgS8crjZWiKd8Nrud9cT981NagFBfjwnV3/6k3dD2VhFT7GtNk7ewquPLsa3Xb2VfqnTxO8 NVxTl/u7vVhff3hieuQjXtuXCwub129OXCjm+n39Se7PFWb8bVMd7Q4x1+3S36J7e/v33mN/ 1yfd653XXtXee9XLVerIjcsbvxsHh8+oX/LptznzlfU6lRXrf7v3HmlweTVBtCnxlN3jE19k LB8+Opd5IcpV3ynXc2fqmtUsqww+Tks0/G0ezzxxWcHF0oy0jRXXjRxOxhSsm3hKUGuGz8tZ 9Rq2Bx0Deh4cX1GlNVfC9ct1keD4qUsXtTTNyuVrXjTbdc3ug9ULI85GFLzkmajEUpyRaKjF XFScCAAbHPCQdQMAAA== X-CMS-MailID: 20230627184020epcas5p13fdcea52edead5ffa3fae444f923439e X-Msg-Generator: CA Content-Type: text/plain; charset="utf-8" X-Sendblock-Type: REQ_APPROVE CMS-TYPE: 105P DLP-Filter: Pass X-CFilter-Loop: Reflected X-CMS-RootMailID: 20230627184020epcas5p13fdcea52edead5ffa3fae444f923439e References: <20230627183629.26571-1-nj.shetty@samsung.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org For the devices which does not support copy, copy emulation is added. It is required for in-kernel users like fabrics, where file descriptor is not available and hence they can't use copy_file_range. Copy-emulation is implemented by reading from source into memory and writing to the corresponding destination asynchronously. Also emulation is used, if copy offload fails or partially completes. Signed-off-by: Nitesh Shetty Signed-off-by: Vincent Fu Signed-off-by: Anuj Gupta --- block/blk-lib.c | 183 +++++++++++++++++++++++++++++++++++++- block/blk-map.c | 4 +- include/linux/blk_types.h | 5 ++ include/linux/blkdev.h | 3 + 4 files changed, 192 insertions(+), 3 deletions(-) diff --git a/block/blk-lib.c b/block/blk-lib.c index 10c3eadd5bf6..09e0d5d51d03 100644 --- a/block/blk-lib.c +++ b/block/blk-lib.c @@ -234,6 +234,180 @@ static ssize_t __blkdev_copy_offload( return blkdev_copy_wait_io_completion(cio); } +static void *blkdev_copy_alloc_buf(sector_t req_size, sector_t *alloc_size, + gfp_t gfp_mask) +{ + int min_size = PAGE_SIZE; + void *buf; + + while (req_size >= min_size) { + buf = kvmalloc(req_size, gfp_mask); + if (buf) { + *alloc_size = req_size; + return buf; + } + /* retry half the requested size */ + req_size >>= 1; + } + + return NULL; +} + +static void blkdev_copy_emulate_write_endio(struct bio *bio) +{ + struct copy_ctx *ctx = bio->bi_private; + struct cio *cio = ctx->cio; + sector_t clen; + + if (bio->bi_status) { + clen = (bio->bi_iter.bi_sector << SECTOR_SHIFT) - cio->pos_out; + cio->comp_len = min_t(sector_t, clen, cio->comp_len); + } + kfree(bvec_virt(&bio->bi_io_vec[0])); + bio_map_kern_endio(bio); + kfree(ctx); + if (atomic_dec_and_test(&cio->refcount)) { + if (cio->endio) { + cio->endio(cio->private, cio->comp_len); + kfree(cio); + } else + blk_wake_io_task(cio->waiter); + } +} + +static void blkdev_copy_emulate_read_endio(struct bio *read_bio) +{ + struct copy_ctx *ctx = read_bio->bi_private; + struct cio *cio = ctx->cio; + sector_t clen; + + if (read_bio->bi_status) { + clen = (read_bio->bi_iter.bi_sector << SECTOR_SHIFT) - + cio->pos_in; + cio->comp_len = min_t(sector_t, clen, cio->comp_len); + kfree(bvec_virt(&read_bio->bi_io_vec[0])); + bio_map_kern_endio(read_bio); + kfree(ctx); + + if (atomic_dec_and_test(&cio->refcount)) { + if (cio->endio) { + cio->endio(cio->private, cio->comp_len); + kfree(cio); + } else + blk_wake_io_task(cio->waiter); + } + } + schedule_work(&ctx->dispatch_work); + kfree(read_bio); +} + +static void blkdev_copy_dispatch_work(struct work_struct *work) +{ + struct copy_ctx *ctx = container_of(work, struct copy_ctx, + dispatch_work); + + submit_bio(ctx->write_bio); +} + +/* + * If native copy offload feature is absent, this function tries to emulate, + * by copying data from source to a temporary buffer and from buffer to + * destination device. + * Returns the length of bytes copied or error if encountered + */ +static ssize_t __blkdev_copy_emulate( + struct block_device *bdev_in, loff_t pos_in, + struct block_device *bdev_out, loff_t pos_out, + size_t len, cio_iodone_t endio, void *private, gfp_t gfp_mask) +{ + struct request_queue *in = bdev_get_queue(bdev_in); + struct request_queue *out = bdev_get_queue(bdev_out); + struct bio *read_bio, *write_bio; + void *buf = NULL; + struct copy_ctx *ctx; + struct cio *cio; + sector_t buf_len, req_len, rem = 0; + sector_t max_src_hw_len = min_t(unsigned int, + queue_max_hw_sectors(in), + queue_max_segments(in) << (PAGE_SHIFT - SECTOR_SHIFT)) + << SECTOR_SHIFT; + sector_t max_dst_hw_len = min_t(unsigned int, + queue_max_hw_sectors(out), + queue_max_segments(out) << (PAGE_SHIFT - SECTOR_SHIFT)) + << SECTOR_SHIFT; + sector_t max_hw_len = min_t(unsigned int, + max_src_hw_len, max_dst_hw_len); + + cio = kzalloc(sizeof(struct cio), GFP_KERNEL); + if (!cio) + return -ENOMEM; + atomic_set(&cio->refcount, 0); + cio->pos_in = pos_in; + cio->pos_out = pos_out; + cio->waiter = current; + cio->endio = endio; + cio->private = private; + + for (rem = len; rem > 0; rem -= buf_len) { + req_len = min_t(int, max_hw_len, rem); + + buf = blkdev_copy_alloc_buf(req_len, &buf_len, gfp_mask); + if (!buf) + goto err_alloc_buf; + + ctx = kzalloc(sizeof(struct copy_ctx), gfp_mask); + if (!ctx) + goto err_ctx; + + read_bio = bio_map_kern(in, buf, buf_len, gfp_mask); + if (IS_ERR(read_bio)) + goto err_read_bio; + + write_bio = bio_map_kern(out, buf, buf_len, gfp_mask); + if (IS_ERR(write_bio)) + goto err_write_bio; + + ctx->cio = cio; + ctx->write_bio = write_bio; + INIT_WORK(&ctx->dispatch_work, blkdev_copy_dispatch_work); + + read_bio->bi_iter.bi_sector = pos_in >> SECTOR_SHIFT; + read_bio->bi_iter.bi_size = buf_len; + read_bio->bi_opf = REQ_OP_READ | REQ_SYNC; + bio_set_dev(read_bio, bdev_in); + read_bio->bi_end_io = blkdev_copy_emulate_read_endio; + read_bio->bi_private = ctx; + + write_bio->bi_iter.bi_size = buf_len; + write_bio->bi_opf = REQ_OP_WRITE | REQ_SYNC; + bio_set_dev(write_bio, bdev_out); + write_bio->bi_end_io = blkdev_copy_emulate_write_endio; + write_bio->bi_iter.bi_sector = pos_out >> SECTOR_SHIFT; + write_bio->bi_private = ctx; + + atomic_inc(&cio->refcount); + submit_bio(read_bio); + + pos_in += buf_len; + pos_out += buf_len; + } + return blkdev_copy_wait_io_completion(cio); + +err_write_bio: + bio_put(read_bio); +err_read_bio: + kfree(ctx); +err_ctx: + kvfree(buf); +err_alloc_buf: + cio->comp_len -= min_t(sector_t, cio->comp_len, len - rem); + if (!atomic_read(&cio->refcount)) { + kfree(cio); + return -ENOMEM; + } + return blkdev_copy_wait_io_completion(cio); +} + static inline ssize_t blkdev_copy_sanity_check( struct block_device *bdev_in, loff_t pos_in, struct block_device *bdev_out, loff_t pos_out, @@ -284,9 +458,16 @@ ssize_t blkdev_copy_offload( if (ret) return ret; - if (blk_queue_copy(q_in) && blk_queue_copy(q_out)) + if (blk_queue_copy(q_in) && blk_queue_copy(q_out)) { ret = __blkdev_copy_offload(bdev_in, pos_in, bdev_out, pos_out, len, endio, private, gfp_mask); + if (ret < 0) + ret = 0; + } + + if (ret != len) + ret = __blkdev_copy_emulate(bdev_in, pos_in + ret, bdev_out, + pos_out + ret, len - ret, endio, private, gfp_mask); return ret; } diff --git a/block/blk-map.c b/block/blk-map.c index 44d74a30ddac..ceeb70a95fd1 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -363,7 +363,7 @@ static void bio_invalidate_vmalloc_pages(struct bio *bio) #endif } -static void bio_map_kern_endio(struct bio *bio) +void bio_map_kern_endio(struct bio *bio) { bio_invalidate_vmalloc_pages(bio); bio_uninit(bio); @@ -380,7 +380,7 @@ static void bio_map_kern_endio(struct bio *bio) * Map the kernel address into a bio suitable for io to a block * device. Returns an error pointer in case of error. */ -static struct bio *bio_map_kern(struct request_queue *q, void *data, +struct bio *bio_map_kern(struct request_queue *q, void *data, unsigned int len, gfp_t gfp_mask) { unsigned long kaddr = (unsigned long)data; diff --git a/include/linux/blk_types.h b/include/linux/blk_types.h index 336146798e56..f8c80940c7ad 100644 --- a/include/linux/blk_types.h +++ b/include/linux/blk_types.h @@ -562,4 +562,9 @@ struct cio { atomic_t refcount; }; +struct copy_ctx { + struct cio *cio; + struct work_struct dispatch_work; + struct bio *write_bio; +}; #endif /* __LINUX_BLK_TYPES_H */ diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h index 963f5c97dec0..c176bf6173c5 100644 --- a/include/linux/blkdev.h +++ b/include/linux/blkdev.h @@ -1047,6 +1047,9 @@ ssize_t blkdev_copy_offload( struct block_device *bdev_in, loff_t pos_in, struct block_device *bdev_out, loff_t pos_out, size_t len, cio_iodone_t end_io, void *private, gfp_t gfp_mask); +struct bio *bio_map_kern(struct request_queue *q, void *data, unsigned int len, + gfp_t gfp_mask); +void bio_map_kern_endio(struct bio *bio); #define BLKDEV_ZERO_NOUNMAP (1 << 0) /* do not free blocks */ #define BLKDEV_ZERO_NOFALLBACK (1 << 1) /* don't write explicit zeroes */ -- 2.35.1.500.gb896f729e2