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 LgJHH/F3 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 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: List-Subscribe: List-Unsubscribe: Alistair Popple wrote: > Prior to freeing a block file systems supporting FS DAX must check > that the associated pages are both unmapped from user-space and not > undergoing DMA or other access from eg. get_user_pages(). This is > achieved by unmapping the file range and scanning the FS DAX > page-cache to see if any pages within the mapping have an elevated > refcount. > > This is done using two functions - dax_layout_busy_page_range() which > returns a page to wait for the refcount to become idle on. Rather than > open-code this introduce a common implementation to both unmap and > wait for the page to become idle. > > Signed-off-by: Alistair Popple > > --- > > Changes for v5: > > - Don't wait for idle pages on non-DAX mappings > > Changes for v4: > > - Fixed some build breakage due to missing symbol exports reported by > John Hubbard (thanks!). [..] > diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c > index cc1acb1..ee8e83f 100644 > --- a/fs/ext4/inode.c > +++ b/fs/ext4/inode.c > @@ -3917,15 +3917,7 @@ int ext4_break_layouts(struct inode *inode) > if (WARN_ON_ONCE(!rwsem_is_locked(&inode->i_mapping->invalidate_lock))) > return -EINVAL; > > - do { > - page = dax_layout_busy_page(inode->i_mapping); > - if (!page) > - return 0; > - > - error = dax_wait_page_idle(page, ext4_wait_dax_page, inode); > - } while (error == 0); > - > - return error; > + return dax_break_mapping_inode(inode, ext4_wait_dax_page); I hit this in my compile testing: fs/ext4/inode.c: In function ‘ext4_break_layouts’: fs/ext4/inode.c:3915:13: error: unused variable ‘error’ [-Werror=unused-variable] 3915 | int error; | ^~~~~ fs/ext4/inode.c:3914:22: error: unused variable ‘page’ [-Werror=unused-variable] 3914 | struct page *page; | ^~~~ cc1: all warnings being treated as errors ...which gets fixed up later on, but bisect breakage is unwanted. The bots will probably find this too eventually.