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iomap: advance the iter directly on unshare range

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Modify unshare range to advance the iter directly. Replace the local
pos and length calculations with direct advances and loop based on
iter state instead.

Signed-off-by: Brian Foster <bfoster@redhat.com>
Link: https://lore.kernel.org/r/20250207143253.314068-10-bfoster@redhat.com
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: "Darrick J. Wong" <djwong@kernel.org>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Brian Foster 2025-02-07 09:32:52 -05:00 committed by Christian Brauner
parent 1a1a3b574b
commit e60837da4d
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GPG Key ID: 91C61BC06578DCA2
1 changed files with 11 additions and 12 deletions
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23
fs/iomap/buffered-io.c
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@ -1263,20 +1263,19 @@ EXPORT_SYMBOL_GPL(iomap_write_delalloc_release);
static loff_t iomap_unshare_iter(struct iomap_iter *iter)
{
struct iomap *iomap = &iter->iomap;
loff_t pos = iter->pos;
loff_t length = iomap_length(iter);
loff_t written = 0;
u64 bytes = iomap_length(iter);
int status;
if (!iomap_want_unshare_iter(iter))
return length;
return iomap_iter_advance(iter, &bytes);
do {
struct folio *folio;
int status;
size_t offset;
size_t bytes = min_t(u64, SIZE_MAX, length);
loff_t pos = iter->pos;
bool ret;
bytes = min_t(u64, SIZE_MAX, bytes);
status = iomap_write_begin(iter, pos, bytes, &folio);
if (unlikely(status))
return status;
@ -1294,14 +1293,14 @@ static loff_t iomap_unshare_iter(struct iomap_iter *iter)
cond_resched();
pos += bytes;
written += bytes;
length -= bytes;
balance_dirty_pages_ratelimited(iter->inode->i_mapping);
} while (length > 0);
return written;
status = iomap_iter_advance(iter, &bytes);
if (status)
break;
} while (bytes > 0);
return status;
}
int