From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mga12.intel.com (mga12.intel.com [192.55.52.136]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ml01.01.org (Postfix) with ESMTPS id 0A6A621309D28 for ; Fri, 9 Aug 2019 16:01:31 -0700 (PDT) From: ira.weiny@intel.com Subject: [RFC PATCH v2 06/19] fs/ext4: Teach dax_layout_busy_page() to operate on a sub-range Date: Fri, 9 Aug 2019 15:58:20 -0700 Message-Id: <20190809225833.6657-7-ira.weiny@intel.com> In-Reply-To: <20190809225833.6657-1-ira.weiny@intel.com> References: <20190809225833.6657-1-ira.weiny@intel.com> MIME-Version: 1.0 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: linux-nvdimm-bounces@lists.01.org Sender: "Linux-nvdimm" To: Andrew Morton Cc: Michal Hocko , Jan Kara , linux-nvdimm@lists.01.org, linux-rdma@vger.kernel.org, John Hubbard , Dave Chinner , linux-kernel@vger.kernel.org, Matthew Wilcox , linux-xfs@vger.kernel.org, Jason Gunthorpe , linux-fsdevel@vger.kernel.org, Theodore Ts'o , linux-ext4@vger.kernel.org, linux-mm@kvack.org List-ID: From: Ira Weiny Callers of dax_layout_busy_page() are only rarely operating on the entire file of concern. Teach dax_layout_busy_page() to operate on a sub-range of the address_space provided. Specifying 0 - ULONG_MAX however, will continue to operate on the "entire file" and XFS is split out to a separate patch by this method. This could potentially speed up dax_layout_busy_page() as well. Signed-off-by: Ira Weiny --- Changes from RFC v1 Fix 0-day build errors fs/dax.c | 15 +++++++++++---- fs/ext4/ext4.h | 2 +- fs/ext4/extents.c | 6 +++--- fs/ext4/inode.c | 19 ++++++++++++------- fs/xfs/xfs_file.c | 3 ++- include/linux/dax.h | 6 ++++-- 6 files changed, 33 insertions(+), 18 deletions(-) diff --git a/fs/dax.c b/fs/dax.c index a14ec32255d8..3ad19c384454 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -573,8 +573,11 @@ bool dax_mapping_is_dax(struct address_space *mapping) EXPORT_SYMBOL_GPL(dax_mapping_is_dax); /** - * dax_layout_busy_page - find first pinned page in @mapping + * dax_layout_busy_page - find first pinned page in @mapping within + * the range @off - @off + @len * @mapping: address space to scan for a page with ref count > 1 + * @off: offset to start at + * @len: length to scan through * * DAX requires ZONE_DEVICE mapped pages. These pages are never * 'onlined' to the page allocator so they are considered idle when @@ -587,9 +590,13 @@ EXPORT_SYMBOL_GPL(dax_mapping_is_dax); * to be able to run unmap_mapping_range() and subsequently not race * mapping_mapped() becoming true. */ -struct page *dax_layout_busy_page(struct address_space *mapping) +struct page *dax_layout_busy_page(struct address_space *mapping, + loff_t off, loff_t len) { - XA_STATE(xas, &mapping->i_pages, 0); + unsigned long start_idx = off >> PAGE_SHIFT; + unsigned long end_idx = (len == ULONG_MAX) ? ULONG_MAX + : start_idx + (len >> PAGE_SHIFT); + XA_STATE(xas, &mapping->i_pages, start_idx); void *entry; unsigned int scanned = 0; struct page *page = NULL; @@ -612,7 +619,7 @@ struct page *dax_layout_busy_page(struct address_space *mapping) unmap_mapping_range(mapping, 0, 0, 1); xas_lock_irq(&xas); - xas_for_each(&xas, entry, ULONG_MAX) { + xas_for_each(&xas, entry, end_idx) { if (WARN_ON_ONCE(!xa_is_value(entry))) continue; if (unlikely(dax_is_locked(entry))) diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h index 9c7f4036021b..32738ccdac1d 100644 --- a/fs/ext4/ext4.h +++ b/fs/ext4/ext4.h @@ -2578,7 +2578,7 @@ extern int ext4_get_inode_loc(struct inode *, struct ext4_iloc *); extern int ext4_inode_attach_jinode(struct inode *inode); extern int ext4_can_truncate(struct inode *inode); extern int ext4_truncate(struct inode *); -extern int ext4_break_layouts(struct inode *); +extern int ext4_break_layouts(struct inode *inode, loff_t offset, loff_t len); extern int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length); extern int ext4_truncate_restart_trans(handle_t *, struct inode *, int nblocks); extern void ext4_set_inode_flags(struct inode *); diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 92266a2da7d6..ded4b1d92299 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -4736,7 +4736,7 @@ static long ext4_zero_range(struct file *file, loff_t offset, */ down_write(&EXT4_I(inode)->i_mmap_sem); - ret = ext4_break_layouts(inode); + ret = ext4_break_layouts(inode, offset, len); if (ret) { up_write(&EXT4_I(inode)->i_mmap_sem); goto out_mutex; @@ -5419,7 +5419,7 @@ int ext4_collapse_range(struct inode *inode, loff_t offset, loff_t len) */ down_write(&EXT4_I(inode)->i_mmap_sem); - ret = ext4_break_layouts(inode); + ret = ext4_break_layouts(inode, offset, len); if (ret) goto out_mmap; @@ -5572,7 +5572,7 @@ int ext4_insert_range(struct inode *inode, loff_t offset, loff_t len) */ down_write(&EXT4_I(inode)->i_mmap_sem); - ret = ext4_break_layouts(inode); + ret = ext4_break_layouts(inode, offset, len); if (ret) goto out_mmap; diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index f08f48de52c5..d3fc6035428c 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -4262,7 +4262,7 @@ static void ext4_wait_dax_page(struct ext4_inode_info *ei) down_write(&ei->i_mmap_sem); } -int ext4_break_layouts(struct inode *inode) +int ext4_break_layouts(struct inode *inode, loff_t offset, loff_t len) { struct ext4_inode_info *ei = EXT4_I(inode); struct page *page; @@ -4279,7 +4279,7 @@ int ext4_break_layouts(struct inode *inode) } do { - page = dax_layout_busy_page(inode->i_mapping); + page = dax_layout_busy_page(inode->i_mapping, offset, len); if (!page) return 0; @@ -4366,7 +4366,7 @@ int ext4_punch_hole(struct inode *inode, loff_t offset, loff_t length) */ down_write(&EXT4_I(inode)->i_mmap_sem); - ret = ext4_break_layouts(inode); + ret = ext4_break_layouts(inode, offset, length); if (ret) goto out_dio; @@ -5657,10 +5657,15 @@ int ext4_setattr(struct dentry *dentry, struct iattr *attr) down_write(&EXT4_I(inode)->i_mmap_sem); - rc = ext4_break_layouts(inode); - if (rc) { - up_write(&EXT4_I(inode)->i_mmap_sem); - return rc; + if (shrink) { + loff_t off = attr->ia_size; + loff_t len = inode->i_size - attr->ia_size; + + rc = ext4_break_layouts(inode, off, len); + if (rc) { + up_write(&EXT4_I(inode)->i_mmap_sem); + return rc; + } } if (attr->ia_size != inode->i_size) { diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c index 28101bbc0b78..8f8d478f9ec6 100644 --- a/fs/xfs/xfs_file.c +++ b/fs/xfs/xfs_file.c @@ -740,7 +740,8 @@ xfs_break_dax_layouts( ASSERT(xfs_isilocked(XFS_I(inode), XFS_MMAPLOCK_EXCL)); - page = dax_layout_busy_page(inode->i_mapping); + /* We default to the "whole file" */ + page = dax_layout_busy_page(inode->i_mapping, 0, ULONG_MAX); if (!page) return 0; diff --git a/include/linux/dax.h b/include/linux/dax.h index da0768b34b48..f34616979e45 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -144,7 +144,8 @@ int dax_writeback_mapping_range(struct address_space *mapping, struct block_device *bdev, struct writeback_control *wbc); bool dax_mapping_is_dax(struct address_space *mapping); -struct page *dax_layout_busy_page(struct address_space *mapping); +struct page *dax_layout_busy_page(struct address_space *mapping, + loff_t off, loff_t len); dax_entry_t dax_lock_page(struct page *page); void dax_unlock_page(struct page *page, dax_entry_t cookie); #else @@ -180,7 +181,8 @@ static inline bool dax_mapping_is_dax(struct address_space *mapping) return false; } -static inline struct page *dax_layout_busy_page(struct address_space *mapping) +static inline struct page *dax_layout_busy_page(struct address_space *mapping, + loff_t off, loff_t len) { return NULL; } -- 2.20.1 _______________________________________________ Linux-nvdimm mailing list Linux-nvdimm@lists.01.org https://lists.01.org/mailman/listinfo/linux-nvdimm