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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!). > --- > fs/dax.c | 33 +++++++++++++++++++++++++++++++++ > fs/ext4/inode.c | 10 +--------- > fs/fuse/dax.c | 29 +++++------------------------ > fs/xfs/xfs_inode.c | 23 +++++------------------ > fs/xfs/xfs_inode.h | 2 +- > include/linux/dax.h | 21 +++++++++++++++++++++ > mm/madvise.c | 8 ++++---- > 7 files changed, 70 insertions(+), 56 deletions(-) > > diff --git a/fs/dax.c b/fs/dax.c > index d010c10..9c3bd07 100644 > --- a/fs/dax.c > +++ b/fs/dax.c > @@ -845,6 +845,39 @@ int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index) > return ret; > } > > +static int wait_page_idle(struct page *page, > + void (cb)(struct inode *), > + struct inode *inode) > +{ > + return ___wait_var_event(page, page_ref_count(page) == 1, > + TASK_INTERRUPTIBLE, 0, 0, cb(inode)); > +} > + > +/* > + * Unmaps the inode and waits for any DMA to complete prior to deleting the > + * DAX mapping entries for the range. > + */ > +int dax_break_mapping(struct inode *inode, loff_t start, loff_t end, > + void (cb)(struct inode *)) > +{ > + struct page *page; > + int error; > + > + if (!dax_mapping(inode->i_mapping)) > + return 0; > + > + do { > + page = dax_layout_busy_page_range(inode->i_mapping, start, end); > + if (!page) > + break; > + > + error = wait_page_idle(page, cb, inode); This implementations removes logic around @retry found in the XFS and FUSE implementations, I think that is a mistake, and EXT4 has apparently been broken in this regard. wait_page_idle() returns after @page is idle, but that does not mean @inode is DMA idle. After one found page from dax_layout_busy_page_range() is waited upon a new call to dax_break_mapping() needs to made to check if another DMA started, or if there were originally more pages active. > + } while (error == 0); > + > + return error; Surprised that the compiler does not warn about an uninitialized variable here?