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Message-Id: <20230424054926.26927-8-hch@lst.de> Date: Mon, 24 Apr 2023 07:49:16 +0200 From: Christoph Hellwig <hch@....de> To: Jens Axboe <axboe@...nel.dk> Cc: Miklos Szeredi <miklos@...redi.hu>, "Darrick J. Wong" <djwong@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, David Howells <dhowells@...hat.com>, Matthew Wilcox <willy@...radead.org>, linux-block@...r.kernel.org, linux-fsdevel@...r.kernel.org, ceph-devel@...r.kernel.org, linux-ext4@...r.kernel.org, linux-f2fs-devel@...ts.sourceforge.net, cluster-devel@...hat.com, linux-xfs@...r.kernel.org, linux-nfs@...r.kernel.org, linux-mm@...ck.org, linux-kernel@...r.kernel.org Subject: [PATCH 07/17] filemap: add a kiocb_invalidate_pages helper Factor out a helper that calls filemap_write_and_wait_range and invalidate_inode_pages2_rangefor a the range covered by a write kiocb or returns -EAGAIN if the kiocb is marked as nowait and there would be pages to write or invalidate. Signed-off-by: Christoph Hellwig <hch@....de> --- include/linux/pagemap.h | 1 + mm/filemap.c | 48 ++++++++++++++++++++++++----------------- 2 files changed, 29 insertions(+), 20 deletions(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 51f7aea51169c4..f6c5ef9d3d7646 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 kiocb_invalidate_pages(struct kiocb *iocb, size_t count); int write_inode_now(struct inode *, int sync); int filemap_fdatawrite(struct address_space *); diff --git a/mm/filemap.c b/mm/filemap.c index 28ea9804191d6b..afb3b0169a9173 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -2780,6 +2780,33 @@ int kiocb_write_and_wait(struct kiocb *iocb, size_t count) return filemap_write_and_wait_range(mapping, pos, end); } +int kiocb_invalidate_pages(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; + int ret; + + if (iocb->ki_flags & IOCB_NOWAIT) { + /* we could block if there are any pages in the range */ + if (filemap_range_has_page(mapping, pos, end)) + return -EAGAIN; + } else { + ret = filemap_write_and_wait_range(mapping, pos, end); + if (ret) + return ret; + } + + /* + * After a write we want buffered reads to be sure to go to disk to get + * the new data. We invalidate clean cached page from the region we're + * about to write. We do this *before* the write so that we can return + * without clobbering -EIOCBQUEUED from ->direct_IO(). + */ + return invalidate_inode_pages2_range(mapping, pos >> PAGE_SHIFT, + end >> PAGE_SHIFT); +} + /** * generic_file_read_iter - generic filesystem read routine * @iocb: kernel I/O control block @@ -3823,30 +3850,11 @@ generic_file_direct_write(struct kiocb *iocb, struct iov_iter *from) write_len = iov_iter_count(from); end = (pos + write_len - 1) >> PAGE_SHIFT; - if (iocb->ki_flags & IOCB_NOWAIT) { - /* If there are pages to writeback, return */ - if (filemap_range_has_page(file->f_mapping, pos, - pos + write_len - 1)) - return -EAGAIN; - } else { - written = filemap_write_and_wait_range(mapping, pos, - pos + write_len - 1); - if (written) - goto out; - } - - /* - * After a write we want buffered reads to be sure to go to disk to get - * the new data. We invalidate clean cached page from the region we're - * about to write. We do this *before* the write so that we can return - * without clobbering -EIOCBQUEUED from ->direct_IO(). - */ - written = invalidate_inode_pages2_range(mapping, - pos >> PAGE_SHIFT, end); /* * If a page can not be invalidated, return 0 to fall back * to buffered write. */ + written = kiocb_invalidate_pages(iocb, write_len); if (written) { if (written == -EBUSY) return 0; -- 2.39.2
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