diff options
| author |   Christoph Hellwig <hch@lst.de> | 2025-02-06 07:40:05 +0100 |
|---|---|---|
| committer |   Christian Brauner <brauner@kernel.org> | 2025-02-06 13:02:14 +0100 |
| commit | e523f2d4c974a819730830ce1c38834ee0cd7318 (patch) | |
| tree | f1bff056da9fa523e03c3002502395d403dabe17 /include/linux/iomap.h | |
| parent | iomap: factor out a iomap_dio_done helper (diff) | |
| download | wireguard-linux-e523f2d4c974a819730830ce1c38834ee0cd7318.tar.xz wireguard-linux-e523f2d4c974a819730830ce1c38834ee0cd7318.zip | |
iomap: optionally use ioends for direct I/O
struct iomap_ioend currently tracks outstanding buffered writes and has
some really nice code in core iomap and XFS to merge contiguous I/Os
an defer them to userspace for completion in a very efficient way.
For zoned writes we'll also need a per-bio user context completion to
record the written blocks, and the infrastructure for that would look
basically like the ioend handling for buffered I/O.
So instead of reinventing the wheel, reuse the existing infrastructure.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20250206064035.2323428-8-hch@lst.de
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
Diffstat (limited to '')
| -rw-r--r-- | include/linux/iomap.h | 10 |
1 files changed, 6 insertions, 4 deletions
diff --git a/include/linux/iomap.h b/include/linux/iomap.h index 90c27875e39d..5768b9f2a1cc 100644 --- a/include/linux/iomap.h +++ b/include/linux/iomap.h @@ -343,20 +343,22 @@ sector_t iomap_bmap(struct address_space *mapping, sector_t bno, #define IOMAP_IOEND_UNWRITTEN (1U << 1) /* don't merge into previous ioend */ #define IOMAP_IOEND_BOUNDARY (1U << 2) +/* is direct I/O */ +#define IOMAP_IOEND_DIRECT (1U << 3) /* * 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) + (IOMAP_IOEND_SHARED | IOMAP_IOEND_UNWRITTEN | IOMAP_IOEND_DIRECT) /* * Structure for writeback I/O completions. * - * File systems implementing ->submit_ioend can split a bio generated - * by iomap. In that case the parent ioend it was split from is recorded - * in ioend->io_parent. + * File systems implementing ->submit_ioend (for buffered I/O) or ->submit_io + * for direct I/O) can split a bio generated by iomap. In that case the parent + * ioend it was split from is recorded in ioend->io_parent. */ struct iomap_ioend { struct list_head io_list; /* next ioend in chain */ |