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Wong" , Trond Myklebust , Anna Schumaker , Jan Kara , Logan Gunthorpe , , , , , , LKML , John Hubbard Subject: [PATCH 4/6] block, bio, fs: convert most filesystems to pin_user_pages_fast() Date: Sat, 27 Aug 2022 01:36:05 -0700 Message-ID: <20220827083607.2345453-5-jhubbard@nvidia.com> X-Mailer: git-send-email 2.37.2 In-Reply-To: <20220827083607.2345453-1-jhubbard@nvidia.com> References: <20220827083607.2345453-1-jhubbard@nvidia.com> MIME-Version: 1.0 X-NVConfidentiality: public Content-Transfer-Encoding: 8bit Content-Type: text/plain X-EOPAttributedMessage: 0 X-MS-PublicTrafficType: Email X-MS-Office365-Filtering-Correlation-Id: 09c15a54-adf0-42fd-6f7c-08da880733f3 X-MS-TrafficTypeDiagnostic: MWHPR1201MB0158:EE_ X-MS-Exchange-SenderADCheck: 1 X-MS-Exchange-AntiSpam-Relay: 0 X-Microsoft-Antispam: BCL:0; X-Microsoft-Antispam-Message-Info: 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 X-Forefront-Antispam-Report: CIP:12.22.5.236;CTRY:US;LANG:en;SCL:1;SRV:;IPV:NLI;SFV:NSPM;H:mail.nvidia.com;PTR:InfoNoRecords;CAT:NONE;SFS:(13230016)(4636009)(39860400002)(396003)(376002)(136003)(346002)(40470700004)(36840700001)(46966006)(36860700001)(41300700001)(478600001)(2906002)(8936002)(36756003)(4326008)(8676002)(70586007)(30864003)(83380400001)(7416002)(5660300002)(40480700001)(82740400003)(70206006)(82310400005)(47076005)(26005)(1076003)(426003)(336012)(186003)(107886003)(54906003)(2616005)(6666004)(40460700003)(356005)(81166007)(316002)(86362001)(6916009)(36900700001);DIR:OUT;SFP:1101; X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 27 Aug 2022 08:36:14.1587 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: 09c15a54-adf0-42fd-6f7c-08da880733f3 X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=43083d15-7273-40c1-b7db-39efd9ccc17a;Ip=[12.22.5.236];Helo=[mail.nvidia.com] X-MS-Exchange-CrossTenant-AuthSource: BN8NAM11FT061.eop-nam11.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: MWHPR1201MB0158 Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Use dio_w_*() wrapper calls, in place of get_user_pages_fast(), get_page() and put_page(). This converts the Direct IO parts of most filesystems over to using FOLL_PIN (pin_user_page*()) page pinning. Signed-off-by: John Hubbard --- block/bio.c | 27 ++++++++++++++------------- block/blk-map.c | 7 ++++--- fs/direct-io.c | 40 ++++++++++++++++++++-------------------- fs/iomap/direct-io.c | 2 +- 4 files changed, 39 insertions(+), 37 deletions(-) diff --git a/block/bio.c b/block/bio.c index 3d3a2678fea2..6c6110f7054e 100644 --- a/block/bio.c +++ b/block/bio.c @@ -1125,7 +1125,7 @@ void __bio_release_pages(struct bio *bio, bool mark_dirty) bio_for_each_segment_all(bvec, bio, iter_all) { if (mark_dirty && !PageCompound(bvec->bv_page)) set_page_dirty_lock(bvec->bv_page); - put_page(bvec->bv_page); + dio_w_unpin_user_page(bvec->bv_page); } } EXPORT_SYMBOL_GPL(__bio_release_pages); @@ -1162,7 +1162,7 @@ static int bio_iov_add_page(struct bio *bio, struct page *page, } if (same_page) - put_page(page); + dio_w_unpin_user_page(page); return 0; } @@ -1176,7 +1176,7 @@ static int bio_iov_add_zone_append_page(struct bio *bio, struct page *page, queue_max_zone_append_sectors(q), &same_page) != len) return -EINVAL; if (same_page) - put_page(page); + dio_w_unpin_user_page(page); return 0; } @@ -1187,10 +1187,10 @@ static int bio_iov_add_zone_append_page(struct bio *bio, struct page *page, * @bio: bio to add pages to * @iter: iov iterator describing the region to be mapped * - * Pins pages from *iter and appends them to @bio's bvec array. The - * pages will have to be released using put_page() when done. - * For multi-segment *iter, this function only adds pages from the - * next non-empty segment of the iov iterator. + * Pins pages from *iter and appends them to @bio's bvec array. The pages will + * have to be released using dio_w_unpin_user_page when done. For multi-segment + * *iter, this function only adds pages from the next non-empty segment of the + * iov iterator. */ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter) { @@ -1218,8 +1218,9 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter) * result to ensure the bio's total size is correct. The remainder of * the iov data will be picked up in the next bio iteration. */ - size = iov_iter_get_pages2(iter, pages, UINT_MAX - bio->bi_iter.bi_size, - nr_pages, &offset); + size = dio_w_iov_iter_pin_pages(iter, pages, + UINT_MAX - bio->bi_iter.bi_size, + nr_pages, &offset); if (unlikely(size <= 0)) return size ? size : -EFAULT; @@ -1252,7 +1253,7 @@ static int __bio_iov_iter_get_pages(struct bio *bio, struct iov_iter *iter) iov_iter_revert(iter, left); out: while (i < nr_pages) - put_page(pages[i++]); + dio_w_unpin_user_page(pages[i++]); return ret; } @@ -1444,9 +1445,9 @@ void bio_set_pages_dirty(struct bio *bio) * have been written out during the direct-IO read. So we take another ref on * the BIO and re-dirty the pages in process context. * - * It is expected that bio_check_pages_dirty() will wholly own the BIO from - * here on. It will run one put_page() against each page and will run one - * bio_put() against the BIO. + * It is expected that bio_check_pages_dirty() will wholly own the BIO from here + * on. It will run one dio_w_unpin_user_page() against each page and will run + * one bio_put() against the BIO. */ static void bio_dirty_fn(struct work_struct *work); diff --git a/block/blk-map.c b/block/blk-map.c index 7196a6b64c80..4e333ad9776d 100644 --- a/block/blk-map.c +++ b/block/blk-map.c @@ -254,7 +254,8 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter, size_t offs, added = 0; int npages; - bytes = iov_iter_get_pages_alloc2(iter, &pages, LONG_MAX, &offs); + bytes = dio_w_iov_iter_pin_pages_alloc(iter, &pages, LONG_MAX, + &offs); if (unlikely(bytes <= 0)) { ret = bytes ? bytes : -EFAULT; goto out_unmap; @@ -276,7 +277,7 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter, if (!bio_add_hw_page(rq->q, bio, page, n, offs, max_sectors, &same_page)) { if (same_page) - put_page(page); + dio_w_unpin_user_page(page); break; } @@ -289,7 +290,7 @@ static int bio_map_user_iov(struct request *rq, struct iov_iter *iter, * release the pages we didn't map into the bio, if any */ while (j < npages) - put_page(pages[j++]); + dio_w_unpin_user_page(pages[j++]); kvfree(pages); /* couldn't stuff something into bio? */ if (bytes) { diff --git a/fs/direct-io.c b/fs/direct-io.c index f669163d5860..05c044c55374 100644 --- a/fs/direct-io.c +++ b/fs/direct-io.c @@ -169,8 +169,8 @@ static inline int dio_refill_pages(struct dio *dio, struct dio_submit *sdio) const enum req_op dio_op = dio->opf & REQ_OP_MASK; ssize_t ret; - ret = iov_iter_get_pages2(sdio->iter, dio->pages, LONG_MAX, DIO_PAGES, - &sdio->from); + ret = dio_w_iov_iter_pin_pages(sdio->iter, dio->pages, LONG_MAX, + DIO_PAGES, &sdio->from); if (ret < 0 && sdio->blocks_available && dio_op == REQ_OP_WRITE) { struct page *page = ZERO_PAGE(0); @@ -181,7 +181,7 @@ static inline int dio_refill_pages(struct dio *dio, struct dio_submit *sdio) */ if (dio->page_errors == 0) dio->page_errors = ret; - get_page(page); + dio_w_pin_user_page(page); dio->pages[0] = page; sdio->head = 0; sdio->tail = 1; @@ -197,7 +197,7 @@ static inline int dio_refill_pages(struct dio *dio, struct dio_submit *sdio) sdio->to = ((ret - 1) & (PAGE_SIZE - 1)) + 1; return 0; } - return ret; + return ret; } /* @@ -324,7 +324,7 @@ static void dio_aio_complete_work(struct work_struct *work) static blk_status_t dio_bio_complete(struct dio *dio, struct bio *bio); /* - * Asynchronous IO callback. + * Asynchronous IO callback. */ static void dio_bio_end_aio(struct bio *bio) { @@ -449,7 +449,7 @@ static inline void dio_bio_submit(struct dio *dio, struct dio_submit *sdio) static inline void dio_cleanup(struct dio *dio, struct dio_submit *sdio) { while (sdio->head < sdio->tail) - put_page(dio->pages[sdio->head++]); + dio_w_unpin_user_page(dio->pages[sdio->head++]); } /* @@ -716,7 +716,7 @@ static inline int dio_bio_add_page(struct dio_submit *sdio) */ if ((sdio->cur_page_len + sdio->cur_page_offset) == PAGE_SIZE) sdio->pages_in_io--; - get_page(sdio->cur_page); + dio_w_pin_user_page(sdio->cur_page); sdio->final_block_in_bio = sdio->cur_page_block + (sdio->cur_page_len >> sdio->blkbits); ret = 0; @@ -725,7 +725,7 @@ static inline int dio_bio_add_page(struct dio_submit *sdio) } return ret; } - + /* * Put cur_page under IO. The section of cur_page which is described by * cur_page_offset,cur_page_len is put into a BIO. The section of cur_page @@ -787,7 +787,7 @@ static inline int dio_send_cur_page(struct dio *dio, struct dio_submit *sdio, * An autonomous function to put a chunk of a page under deferred IO. * * The caller doesn't actually know (or care) whether this piece of page is in - * a BIO, or is under IO or whatever. We just take care of all possible + * a BIO, or is under IO or whatever. We just take care of all possible * situations here. The separation between the logic of do_direct_IO() and * that of submit_page_section() is important for clarity. Please don't break. * @@ -832,13 +832,13 @@ submit_page_section(struct dio *dio, struct dio_submit *sdio, struct page *page, */ if (sdio->cur_page) { ret = dio_send_cur_page(dio, sdio, map_bh); - put_page(sdio->cur_page); + dio_w_unpin_user_page(sdio->cur_page); sdio->cur_page = NULL; if (ret) return ret; } - get_page(page); /* It is in dio */ + dio_w_pin_user_page(page); /* It is in dio */ sdio->cur_page = page; sdio->cur_page_offset = offset; sdio->cur_page_len = len; @@ -853,7 +853,7 @@ submit_page_section(struct dio *dio, struct dio_submit *sdio, struct page *page, ret = dio_send_cur_page(dio, sdio, map_bh); if (sdio->bio) dio_bio_submit(dio, sdio); - put_page(sdio->cur_page); + dio_w_unpin_user_page(sdio->cur_page); sdio->cur_page = NULL; } return ret; @@ -890,7 +890,7 @@ static inline void dio_zero_block(struct dio *dio, struct dio_submit *sdio, * We need to zero out part of an fs block. It is either at the * beginning or the end of the fs block. */ - if (end) + if (end) this_chunk_blocks = dio_blocks_per_fs_block - this_chunk_blocks; this_chunk_bytes = this_chunk_blocks << sdio->blkbits; @@ -954,7 +954,7 @@ static int do_direct_IO(struct dio *dio, struct dio_submit *sdio, ret = get_more_blocks(dio, sdio, map_bh); if (ret) { - put_page(page); + dio_w_unpin_user_page(page); goto out; } if (!buffer_mapped(map_bh)) @@ -999,7 +999,7 @@ static int do_direct_IO(struct dio *dio, struct dio_submit *sdio, /* AKPM: eargh, -ENOTBLK is a hack */ if (dio_op == REQ_OP_WRITE) { - put_page(page); + dio_w_unpin_user_page(page); return -ENOTBLK; } @@ -1012,7 +1012,7 @@ static int do_direct_IO(struct dio *dio, struct dio_submit *sdio, if (sdio->block_in_file >= i_size_aligned >> blkbits) { /* We hit eof */ - put_page(page); + dio_w_unpin_user_page(page); goto out; } zero_user(page, from, 1 << blkbits); @@ -1052,7 +1052,7 @@ static int do_direct_IO(struct dio *dio, struct dio_submit *sdio, sdio->next_block_for_io, map_bh); if (ret) { - put_page(page); + dio_w_unpin_user_page(page); goto out; } sdio->next_block_for_io += this_chunk_blocks; @@ -1067,8 +1067,8 @@ static int do_direct_IO(struct dio *dio, struct dio_submit *sdio, break; } - /* Drop the ref which was taken in get_user_pages() */ - put_page(page); + /* Drop the ref which was taken in [get|pin]_user_pages() */ + dio_w_unpin_user_page(page); } out: return ret; @@ -1288,7 +1288,7 @@ ssize_t __blockdev_direct_IO(struct kiocb *iocb, struct inode *inode, ret2 = dio_send_cur_page(dio, &sdio, &map_bh); if (retval == 0) retval = ret2; - put_page(sdio.cur_page); + dio_w_unpin_user_page(sdio.cur_page); sdio.cur_page = NULL; } if (sdio.bio) diff --git a/fs/iomap/direct-io.c b/fs/iomap/direct-io.c index 4eb559a16c9e..fc7763c418d1 100644 --- a/fs/iomap/direct-io.c +++ b/fs/iomap/direct-io.c @@ -202,7 +202,7 @@ static void iomap_dio_zero(const struct iomap_iter *iter, struct iomap_dio *dio, bio->bi_private = dio; bio->bi_end_io = iomap_dio_bio_end_io; - get_page(page); + dio_w_pin_user_page(page); __bio_add_page(bio, page, len, 0); iomap_dio_submit_bio(iter, dio, bio, pos); } -- 2.37.2