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Merge patch series "iomap: make buffered writes work with RWF_DONTCACHE"

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Support buffered writes with RWF_DONTCACHE.

* patches from https://lore.kernel.org/r/20250204184047.356762-2-axboe@kernel.dk:
  xfs: flag as supporting FOP_DONTCACHE
  iomap: make buffered writes work with RWF_DONTCACHE

Link: https://lore.kernel.org/r/20250204184047.356762-2-axboe@kernel.dk
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-02-27 11:28:00 +01:00
commit 13368df520
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GPG Key ID: 91C61BC06578DCA2
5 changed files with 14 additions and 1 deletions
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5
Documentation/filesystems/iomap/design.rst
View File

@ -352,6 +352,11 @@ operations:
``IOMAP_NOWAIT`` is often set on behalf of ``IOCB_NOWAIT`` or
``RWF_NOWAIT``.
* ``IOMAP_DONTCACHE`` is set when the caller wishes to perform a
buffered file I/O and would like the kernel to drop the pagecache
after the I/O completes, if it isn't already being used by another
thread.
If it is necessary to read existing file contents from a `different
<https://lore.kernel.org/all/20191008071527.29304-9-hch@lst.de/>`_
device or address range on a device, the filesystem should return that

2
Documentation/filesystems/iomap/operations.rst
View File

@ -131,6 +131,8 @@ These ``struct kiocb`` flags are significant for buffered I/O with iomap:
* ``IOCB_NOWAIT``: Turns on ``IOMAP_NOWAIT``.
* ``IOCB_DONTCACHE``: Turns on ``IOMAP_DONTCACHE``.
Internal per-Folio State
------------------------

4
fs/iomap/buffered-io.c
View File

@ -603,6 +603,8 @@ struct folio *iomap_get_folio(struct iomap_iter *iter, loff_t pos, size_t len)
if (iter->flags & IOMAP_NOWAIT)
fgp |= FGP_NOWAIT;
if (iter->flags & IOMAP_DONTCACHE)
fgp |= FGP_DONTCACHE;
fgp |= fgf_set_order(len);
return __filemap_get_folio(iter->inode->i_mapping, pos >> PAGE_SHIFT,
@ -1034,6 +1036,8 @@ iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *i,
if (iocb->ki_flags & IOCB_NOWAIT)
iter.flags |= IOMAP_NOWAIT;
if (iocb->ki_flags & IOCB_DONTCACHE)
iter.flags |= IOMAP_DONTCACHE;
while ((ret = iomap_iter(&iter, ops)) > 0)
iter.processed = iomap_write_iter(&iter, i);

3
fs/xfs/xfs_file.c
View File

@ -1626,7 +1626,8 @@ const struct file_operations xfs_file_operations = {
.fadvise = xfs_file_fadvise,
.remap_file_range = xfs_file_remap_range,
.fop_flags = FOP_MMAP_SYNC | FOP_BUFFER_RASYNC |
FOP_BUFFER_WASYNC | FOP_DIO_PARALLEL_WRITE,
FOP_BUFFER_WASYNC | FOP_DIO_PARALLEL_WRITE |
FOP_DONTCACHE,
};
const struct file_operations xfs_dir_file_operations = {

1
include/linux/iomap.h
View File

@ -183,6 +183,7 @@ struct iomap_folio_ops {
#define IOMAP_DAX 0
#endif /* CONFIG_FS_DAX */
#define IOMAP_ATOMIC (1 << 9)
#define IOMAP_DONTCACHE (1 << 10)
struct iomap_ops {
/*