[PATCH 01/17] iomap: Hold state_lock over call to ifs_set_range_uptodate()

Matthew Wilcox (Oracle)
2023-09-15T18:38:18Z

This is really preparation for the next patch, but it lets us call
folio_mark_uptodate() in just one place instead of two.

Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
fs/iomap/buffered-io.c | 20 +++++++++++---------
1 file changed, 11 insertions(+), 9 deletions(-)

diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index ae8673ce08b1..4c05fd457ee7 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -57,30 +57,32 @@ static inline bool ifs_block_is_uptodate(struct iomap_folio_state *ifs,
return test_bit(block, ifs->state);
}

-static void ifs_set_range_uptodate(struct folio *folio,
+static bool ifs_set_range_uptodate(struct folio *folio,
struct iomap_folio_state *ifs, size_t off, size_t len)
{
struct inode *inode = folio->mapping->host;
unsigned int first_blk = off >> inode->i_blkbits;
unsigned int last_blk = (off + len - 1) >> inode->i_blkbits;
unsigned int nr_blks = last_blk - first_blk + 1;
- unsigned long flags;

- spin_lock_irqsave(&ifs->state_lock, flags);
bitmap_set(ifs->state, first_blk, nr_blks);
- if (ifs_is_fully_uptodate(folio, ifs))
- folio_mark_uptodate(folio);
- spin_unlock_irqrestore(&ifs->state_lock, flags);
+ return ifs_is_fully_uptodate(folio, ifs);
}

static void iomap_set_range_uptodate(struct folio *folio, size_t off,
size_t len)
{
struct iomap_folio_state *ifs = folio->private;
+ unsigned long flags;
+ bool uptodate = true;

- if (ifs)
- ifs_set_range_uptodate(folio, ifs, off, len);
- else
+ if (ifs) {
+ spin_lock_irqsave(&ifs->state_lock, flags);
+ uptodate = ifs_set_range_uptodate(folio, ifs, off, len);
+ spin_unlock_irqrestore(&ifs->state_lock, flags);
+ }
+
+ if (uptodate)
folio_mark_uptodate(folio);
}

--
2.40.1