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Wong" , Trond Myklebust , Anna Schumaker , Damien Le Moal , Andrew Morton , linux-block@vger.kernel.org, ceph-devel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-ext4@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, cluster-devel@redhat.com, linux-xfs@vger.kernel.org, linux-nfs@vger.kernel.org, linux-mm@kvack.org, Hannes Reinecke Subject: [PATCH 4/8] filemap: add a kiocb_write_and_wait helper Date: Wed, 31 May 2023 09:20:02 +0200 Message-Id: <20230531072006.476386-5-hch@lst.de> X-Mailer: git-send-email 2.39.2 In-Reply-To: <20230531072006.476386-1-hch@lst.de> References: <20230531072006.476386-1-hch@lst.de> MIME-Version: 1.0 X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 55329140006 X-Stat-Signature: 86uib34bjgtgp97q5epbjpxtxbugrqjs X-HE-Tag: 1685517635-853177 X-HE-Meta: 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 Tyh8m+vq Na9bUMN0CCdeUsreBN34uBNrf+fjyb6BGWrN0EaGb4wZ6yxYvNp871Pvu6O/b8n0v+ZC7E5uMMrCogMEyizAs3retxa3BElBY4GtVij4EEEF26381r+tgV91i3eQchqVssPvgcOlJyyiLr4POpkP6Y/a2/d46XybTdBmTH71qNRiVvHgFiiBxHg3WQEk3kAX7rsFHRKzesbXlU38pjERcKUvJQXbIx3mF4kLrxO+7RqsLpV9WUMRSO1vvAbtytI46IHf66r4kFq0xIQEvGXJW0qde+2ZpX1FrrCcmMCeeBTiY/wmeak9qZKxjbyBy65QnNqSNVFddRZYJdhicfYFq56JW+qANCTOOqJvZQnqCwEDb5svSsTC7YgcyN6Rz/+MgOUhsdP0xy94qwM3FIczsxwbIlH9qF1d/01wRPOTfII7REOX/u+vrpIwS/gjczU5OiO2dvA8mllc5iMcEfw6VQM/kpvi9TXHkmP4LGb0CUzuWLMuWCNT2F6HvT7jnigQRxKyaE8xjVxeIEy/eyM9O9o0hDnkecgnwKhGPbBAjJ7HiAZo= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: Factor out a helper that does filemap_write_and_wait_range for the range covered by a read kiocb, or returns -EAGAIN if the kiocb is marked as nowait and there would be pages to write. Signed-off-by: Christoph Hellwig Reviewed-by: Damien Le Moal Reviewed-by: Hannes Reinecke Acked-by: Darrick J. Wong --- block/fops.c | 18 +++--------------- include/linux/pagemap.h | 2 ++ mm/filemap.c | 30 ++++++++++++++++++------------ 3 files changed, 23 insertions(+), 27 deletions(-) diff --git a/block/fops.c b/block/fops.c index 58d0aebc7313a8..575171049c5d83 100644 --- a/block/fops.c +++ b/block/fops.c @@ -576,21 +576,9 @@ static ssize_t blkdev_read_iter(struct kiocb *iocb, struct iov_iter *to) goto reexpand; /* skip atime */ if (iocb->ki_flags & IOCB_DIRECT) { - struct address_space *mapping = iocb->ki_filp->f_mapping; - - if (iocb->ki_flags & IOCB_NOWAIT) { - if (filemap_range_needs_writeback(mapping, pos, - pos + count - 1)) { - ret = -EAGAIN; - goto reexpand; - } - } else { - ret = filemap_write_and_wait_range(mapping, pos, - pos + count - 1); - if (ret < 0) - goto reexpand; - } - + ret = kiocb_write_and_wait(iocb, count); + if (ret < 0) + goto reexpand; file_accessed(iocb->ki_filp); ret = blkdev_direct_IO(iocb, to); diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index a56308a9d1a450..36fc2cea13ce20 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -30,6 +30,7 @@ static inline void invalidate_remote_inode(struct inode *inode) int invalidate_inode_pages2(struct address_space *mapping); int invalidate_inode_pages2_range(struct address_space *mapping, pgoff_t start, pgoff_t end); + int write_inode_now(struct inode *, int sync); int filemap_fdatawrite(struct address_space *); int filemap_flush(struct address_space *); @@ -54,6 +55,7 @@ int filemap_check_errors(struct address_space *mapping); void __filemap_set_wb_err(struct address_space *mapping, int err); int filemap_fdatawrite_wbc(struct address_space *mapping, struct writeback_control *wbc); +int kiocb_write_and_wait(struct kiocb *iocb, size_t count); static inline int filemap_write_and_wait(struct address_space *mapping) { diff --git a/mm/filemap.c b/mm/filemap.c index 15907af4a57ff5..5fcd5227f9cae2 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2762,6 +2762,21 @@ ssize_t filemap_read(struct kiocb *iocb, struct iov_iter *iter, } EXPORT_SYMBOL_GPL(filemap_read); +int kiocb_write_and_wait(struct kiocb *iocb, size_t count) +{ + struct address_space *mapping = iocb->ki_filp->f_mapping; + loff_t pos = iocb->ki_pos; + loff_t end = pos + count - 1; + + if (iocb->ki_flags & IOCB_NOWAIT) { + if (filemap_range_needs_writeback(mapping, pos, end)) + return -EAGAIN; + return 0; + } + + return filemap_write_and_wait_range(mapping, pos, end); +} + /** * generic_file_read_iter - generic filesystem read routine * @iocb: kernel I/O control block @@ -2797,18 +2812,9 @@ generic_file_read_iter(struct kiocb *iocb, struct iov_iter *iter) struct address_space *mapping = file->f_mapping; struct inode *inode = mapping->host; - if (iocb->ki_flags & IOCB_NOWAIT) { - if (filemap_range_needs_writeback(mapping, iocb->ki_pos, - iocb->ki_pos + count - 1)) - return -EAGAIN; - } else { - retval = filemap_write_and_wait_range(mapping, - iocb->ki_pos, - iocb->ki_pos + count - 1); - if (retval < 0) - return retval; - } - + retval = kiocb_write_and_wait(iocb, count); + if (retval < 0) + return retval; file_accessed(file); retval = mapping->a_ops->direct_IO(iocb, iter);