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iomap: add public helpers for uptodate state manipulation

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Add a new iomap_start_folio_write helper to abstract away the
write_bytes_pending handling, and export it and the existing
iomap_finish_folio_write for non-iomap writeback in fuse.

Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
[hch: split from a larger patch]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/20250710133343.399917-7-hch@lst.de
Reviewed-by: Brian Foster <bfoster@redhat.com>
Reviewed-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Joanne Koong
2025-07-10 15:33:30 +02:00
committed by Christian Brauner
parent f4fa7981fa
commit 9caf1ea80c
2 changed files with 20 additions and 5 deletions
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20
fs/iomap/buffered-io.c
View File

@@ -1527,7 +1527,18 @@ vm_fault_t iomap_page_mkwrite(struct vm_fault *vmf, const struct iomap_ops *ops,
}
EXPORT_SYMBOL_GPL(iomap_page_mkwrite);
static void iomap_finish_folio_write(struct inode *inode, struct folio *folio,
void iomap_start_folio_write(struct inode *inode, struct folio *folio,
size_t len)
{
struct iomap_folio_state *ifs = folio->private;
WARN_ON_ONCE(i_blocks_per_folio(inode, folio) > 1 && !ifs);
if (ifs)
atomic_add(len, &ifs->write_bytes_pending);
}
EXPORT_SYMBOL_GPL(iomap_start_folio_write);
void iomap_finish_folio_write(struct inode *inode, struct folio *folio,
size_t len)
{
struct iomap_folio_state *ifs = folio->private;
@@ -1538,6 +1549,7 @@ static void iomap_finish_folio_write(struct inode *inode, struct folio *folio,
if (!ifs || atomic_sub_and_test(len, &ifs->write_bytes_pending))
folio_end_writeback(folio);
}
EXPORT_SYMBOL_GPL(iomap_finish_folio_write);
/*
* We're now finished for good with this ioend structure. Update the page
@@ -1660,7 +1672,6 @@ ssize_t iomap_add_to_ioend(struct iomap_writepage_ctx *wpc, struct folio *folio,
loff_t pos, loff_t end_pos, unsigned int dirty_len)
{
struct iomap_ioend *ioend = wpc->wb_ctx;
struct iomap_folio_state *ifs = folio->private;
size_t poff = offset_in_folio(folio, pos);
unsigned int ioend_flags = 0;
unsigned int map_len = min_t(u64, dirty_len,
@@ -1703,8 +1714,7 @@ ssize_t iomap_add_to_ioend(struct iomap_writepage_ctx *wpc, struct folio *folio,
if (!bio_add_folio(&ioend->io_bio, folio, map_len, poff))
goto new_ioend;
if (ifs)
atomic_add(map_len, &ifs->write_bytes_pending);
iomap_start_folio_write(wpc->inode, folio, map_len);
/*
* Clamp io_offset and io_size to the incore EOF so that ondisk
@@ -1877,7 +1887,7 @@ static int iomap_writepage_map(struct iomap_writepage_ctx *wpc,
* all blocks.
*/
WARN_ON_ONCE(atomic_read(&ifs->write_bytes_pending) != 0);
atomic_inc(&ifs->write_bytes_pending);
iomap_start_folio_write(inode, folio, 1);
}
/*

5
include/linux/iomap.h
View File

@@ -461,6 +461,11 @@ ssize_t iomap_add_to_ioend(struct iomap_writepage_ctx *wpc, struct folio *folio,
loff_t pos, loff_t end_pos, unsigned int dirty_len);
int iomap_ioend_writeback_submit(struct iomap_writepage_ctx *wpc, int error);
void iomap_start_folio_write(struct inode *inode, struct folio *folio,
size_t len);
void iomap_finish_folio_write(struct inode *inode, struct folio *folio,
size_t len);
int iomap_writepages(struct iomap_writepage_ctx *wpc);
/*