From 710273330663241d9ca5fbed51909e65807556ad Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Thu, 6 Feb 2025 07:40:00 +0100 Subject: iomap: simplify io_flags and io_type in struct iomap_ioend The ioend fields for distinct types of I/O are a bit complicated. Consolidate them into a single io_flag field with it's own flags decoupled from the iomap flags. This also prepares for adding a new flag that is unrelated to both of the iomap namespaces. Signed-off-by: Christoph Hellwig Link: https://lore.kernel.org/r/20250206064035.2323428-3-hch@lst.de Reviewed-by: "Darrick J. Wong" Signed-off-by: Christian Brauner --- include/linux/iomap.h | 20 ++++++++++++++++++-- 1 file changed, 18 insertions(+), 2 deletions(-) (limited to 'include/linux') diff --git a/include/linux/iomap.h b/include/linux/iomap.h index dc8df4f779d4..9583f6456165 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -327,13 +327,29 @@ loff_t iomap_seek_data(struct inode *inode, loff_t offset, sector_t iomap_bmap(struct address_space *mapping, sector_t bno, const struct iomap_ops *ops); +/* + * Flags for iomap_ioend->io_flags. + */ +/* shared COW extent */ +#define IOMAP_IOEND_SHARED (1U << 0) +/* unwritten extent */ +#define IOMAP_IOEND_UNWRITTEN (1U << 1) +/* don't merge into previous ioend */ +#define IOMAP_IOEND_BOUNDARY (1U << 2) + +/* + * Flags that if set on either ioend prevent the merge of two ioends. + * (IOMAP_IOEND_BOUNDARY also prevents merges, but only one-way) + */ +#define IOMAP_IOEND_NOMERGE_FLAGS \ + (IOMAP_IOEND_SHARED | IOMAP_IOEND_UNWRITTEN) + /* * Structure for writeback I/O completions. */ struct iomap_ioend { struct list_head io_list; /* next ioend in chain */ - u16 io_type; - u16 io_flags; /* IOMAP_F_* */ + u16 io_flags; /* IOMAP_IOEND_* */ struct inode *io_inode; /* file being written to */ size_t io_size; /* size of data within eof */ loff_t io_offset; /* offset in the file */ -- cgit v1.2.3