summaryrefslogtreecommitdiff
path: root/include/linux/iomap.h
diff options
context:
space:
mode:
authorChristoph Hellwig <hch@lst.de>2018-06-20 01:10:58 +0300
committerDarrick J. Wong <darrick.wong@oracle.com>2018-06-20 19:32:41 +0300
commitc03cea42149de56fbae2301d7123daaa2cfe80e2 (patch)
treefd4293998868758f4e522165babcd4ecbff417a4 /include/linux/iomap.h
parent72b4daa241295440f98e80ae21294a67b27ca091 (diff)
downloadlinux-c03cea42149de56fbae2301d7123daaa2cfe80e2.tar.xz
iomap: add initial support for writes without buffer heads
For now just limited to blocksize == PAGE_SIZE, where we can simply read in the full page in write begin, and just set the whole page dirty after copying data into it. This code is enabled by default and XFS will now be feed pages without buffer heads in ->writepage and ->writepages. If a file system sets the IOMAP_F_BUFFER_HEAD flag on the iomap the old path will still be used, this both helps the transition in XFS and prepares for the gfs2 migration to the iomap infrastructure. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Brian Foster <bfoster@redhat.com> Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Diffstat (limited to 'include/linux/iomap.h')
-rw-r--r--include/linux/iomap.h2
1 files changed, 2 insertions, 0 deletions
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 30d314407f66..5eb9ca8d7ce5 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -30,6 +30,7 @@ struct vm_fault;
*/
#define IOMAP_F_NEW 0x01 /* blocks have been newly allocated */
#define IOMAP_F_DIRTY 0x02 /* uncommitted metadata */
+#define IOMAP_F_BUFFER_HEAD 0x04 /* file system requires buffer heads */
/*
* Flags that only need to be reported for IOMAP_REPORT requests:
@@ -102,6 +103,7 @@ ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
int iomap_readpage(struct page *page, const struct iomap_ops *ops);
int iomap_readpages(struct address_space *mapping, struct list_head *pages,
unsigned nr_pages, const struct iomap_ops *ops);
+int iomap_set_page_dirty(struct page *page);
int iomap_file_dirty(struct inode *inode, loff_t pos, loff_t len,
const struct iomap_ops *ops);
int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len,