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Received: from willy by bombadil.infradead.org with local (Exim 4.92.3 #3 (Red Hat Linux)) id 1ivAMd-0006Va-CG; Sat, 25 Jan 2020 01:35:55 +0000 From: Matthew Wilcox To: linux-fsdevel@vger.kernel.org Cc: "Matthew Wilcox (Oracle)" , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-btrfs@vger.kernel.org Subject: [PATCH 06/12] btrfs: Convert from readpages to readahead Date: Fri, 24 Jan 2020 17:35:47 -0800 Message-Id: <20200125013553.24899-7-willy@infradead.org> X-Mailer: git-send-email 2.21.1 In-Reply-To: <20200125013553.24899-1-willy@infradead.org> References: <20200125013553.24899-1-willy@infradead.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org From: "Matthew Wilcox (Oracle)" Use the new readahead operation in btrfs Signed-off-by: Matthew Wilcox (Oracle) Cc: linux-btrfs@vger.kernel.org --- fs/btrfs/extent_io.c | 15 ++++----------- fs/btrfs/extent_io.h | 2 +- fs/btrfs/inode.c | 18 +++++++++--------- 3 files changed, 14 insertions(+), 21 deletions(-) diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c index 2f4802f405a2..b1e2acbec165 100644 --- a/fs/btrfs/extent_io.c +++ b/fs/btrfs/extent_io.c @@ -4283,7 +4283,7 @@ int extent_writepages(struct address_space *mapping, return ret; } -int extent_readpages(struct address_space *mapping, struct list_head *pages, +unsigned extent_readahead(struct address_space *mapping, pgoff_t start, unsigned nr_pages) { struct bio *bio = NULL; @@ -4294,20 +4294,13 @@ int extent_readpages(struct address_space *mapping, struct list_head *pages, int nr = 0; u64 prev_em_start = (u64)-1; - while (!list_empty(pages)) { + while (nr_pages) { u64 contig_end = 0; - for (nr = 0; nr < ARRAY_SIZE(pagepool) && !list_empty(pages);) { - struct page *page = lru_to_page(pages); + for (nr = 0; nr < ARRAY_SIZE(pagepool) && nr_pages--;) { + struct page *page = readahead_page(mapping, start++); prefetchw(&page->flags); - list_del(&page->lru); - if (add_to_page_cache_lru(page, mapping, page->index, - readahead_gfp_mask(mapping))) { - put_page(page); - break; - } - pagepool[nr++] = page; contig_end = page_offset(page) + PAGE_SIZE - 1; } diff --git a/fs/btrfs/extent_io.h b/fs/btrfs/extent_io.h index a8551a1f56e2..d0f154766a02 100644 --- a/fs/btrfs/extent_io.h +++ b/fs/btrfs/extent_io.h @@ -200,7 +200,7 @@ int extent_writepages(struct address_space *mapping, struct writeback_control *wbc); int btree_write_cache_pages(struct address_space *mapping, struct writeback_control *wbc); -int extent_readpages(struct address_space *mapping, struct list_head *pages, +unsigned extent_readahead(struct address_space *mapping, pgoff_t start, unsigned nr_pages); int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, __u64 start, __u64 len); diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c index c70baafb2a39..4f223b4f7dff 100644 --- a/fs/btrfs/inode.c +++ b/fs/btrfs/inode.c @@ -5395,8 +5395,8 @@ static void evict_inode_truncate_pages(struct inode *inode) /* * Keep looping until we have no more ranges in the io tree. - * We can have ongoing bios started by readpages (called from readahead) - * that have their endio callback (extent_io.c:end_bio_extent_readpage) + * We can have ongoing bios started by readahead that have + * their endio callback (extent_io.c:end_bio_extent_readpage) * still in progress (unlocked the pages in the bio but did not yet * unlocked the ranges in the io tree). Therefore this means some * ranges can still be locked and eviction started because before @@ -7586,11 +7586,11 @@ static int lock_extent_direct(struct inode *inode, u64 lockstart, u64 lockend, * for it to complete) and then invalidate the pages for * this range (through invalidate_inode_pages2_range()), * but that can lead us to a deadlock with a concurrent - * call to readpages() (a buffered read or a defrag call + * call to readahead (a buffered read or a defrag call * triggered a readahead) on a page lock due to an * ordered dio extent we created before but did not have * yet a corresponding bio submitted (whence it can not - * complete), which makes readpages() wait for that + * complete), which makes readahead wait for that * ordered extent to complete while holding a lock on * that page. */ @@ -8829,11 +8829,11 @@ static int btrfs_writepages(struct address_space *mapping, return extent_writepages(mapping, wbc); } -static int -btrfs_readpages(struct file *file, struct address_space *mapping, - struct list_head *pages, unsigned nr_pages) +static unsigned +btrfs_readahead(struct file *file, struct address_space *mapping, + pgoff_t start, unsigned nr_pages) { - return extent_readpages(mapping, pages, nr_pages); + return extent_readahead(mapping, start, nr_pages); } static int __btrfs_releasepage(struct page *page, gfp_t gfp_flags) @@ -11045,7 +11045,7 @@ static const struct address_space_operations btrfs_aops = { .readpage = btrfs_readpage, .writepage = btrfs_writepage, .writepages = btrfs_writepages, - .readpages = btrfs_readpages, + .readahead = btrfs_readahead, .direct_IO = btrfs_direct_IO, .invalidatepage = btrfs_invalidatepage, .releasepage = btrfs_releasepage, -- 2.24.1