This is a note to let you know that I've just added the patch titled
iomap: turn iomap_want_unshare_iter into an inline function
to the 6.1-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
iomap-turn-iomap_want_unshare_iter-into-an-inline-fu.patch
and it can be found in the queue-6.1 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 6867f8cfd3e33f545c3150b8453db5ff809f0738
Author: Christoph Hellwig <hch@xxxxxx>
Date: Tue Oct 15 06:13:50 2024 +0200
iomap: turn iomap_want_unshare_iter into an inline function
[ Upstream commit 6db388585e486c0261aeef55f8bc63a9b45756c0 ]
iomap_want_unshare_iter currently sits in fs/iomap/buffered-io.c, which
depends on CONFIG_BLOCK. It is also in used in fs/dax.c whіch has no
such dependency. Given that it is a trivial check turn it into an inline
in include/linux/iomap.h to fix the DAX && !BLOCK build.
Fixes: 6ef6a0e821d3 ("iomap: share iomap_unshare_iter predicate code with fsdax")
Reported-by: kernel test robot <lkp@xxxxxxxxx>
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Link: https://lore.kernel.org/r/20241015041350.118403-1-hch@xxxxxx
Reviewed-by: Brian Foster <bfoster@xxxxxxxxxx>
Signed-off-by: Christian Brauner <brauner@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c
index 876273db711d1..47f44b02c17de 100644
--- a/fs/iomap/buffered-io.c
+++ b/fs/iomap/buffered-io.c
@@ -1084,23 +1084,6 @@ int iomap_file_buffered_write_punch_delalloc(struct inode *inode,
}
EXPORT_SYMBOL_GPL(iomap_file_buffered_write_punch_delalloc);
-bool iomap_want_unshare_iter(const struct iomap_iter *iter)
-{
- /*
- * Don't bother with blocks that are not shared to start with; or
- * mappings that cannot be shared, such as inline data, delalloc
- * reservations, holes or unwritten extents.
- *
- * Note that we use srcmap directly instead of iomap_iter_srcmap as
- * unsharing requires providing a separate source map, and the presence
- * of one is a good indicator that unsharing is needed, unlike
- * IOMAP_F_SHARED which can be set for any data that goes into the COW
- * fork for XFS.
- */
- return (iter->iomap.flags & IOMAP_F_SHARED) &&
- iter->srcmap.type == IOMAP_MAPPED;
-}
-
static loff_t iomap_unshare_iter(struct iomap_iter *iter)
{
struct iomap *iomap = &iter->iomap;
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
index 0a37b54e24926..1de65d5d79d4d 100644
--- a/include/linux/iomap.h
+++ b/include/linux/iomap.h
@@ -251,6 +251,25 @@ static inline const struct iomap *iomap_iter_srcmap(const struct iomap_iter *i)
return &i->iomap;
}
+/*
+ * Check if the range needs to be unshared for a FALLOC_FL_UNSHARE_RANGE
+ * operation.
+ *
+ * Don't bother with blocks that are not shared to start with; or mappings that
+ * cannot be shared, such as inline data, delalloc reservations, holes or
+ * unwritten extents.
+ *
+ * Note that we use srcmap directly instead of iomap_iter_srcmap as unsharing
+ * requires providing a separate source map, and the presence of one is a good
+ * indicator that unsharing is needed, unlike IOMAP_F_SHARED which can be set
+ * for any data that goes into the COW fork for XFS.
+ */
+static inline bool iomap_want_unshare_iter(const struct iomap_iter *iter)
+{
+ return (iter->iomap.flags & IOMAP_F_SHARED) &&
+ iter->srcmap.type == IOMAP_MAPPED;
+}
+
ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
const struct iomap_ops *ops);
int iomap_file_buffered_write_punch_delalloc(struct inode *inode,
@@ -264,7 +283,6 @@ bool iomap_release_folio(struct folio *folio, gfp_t gfp_flags);
void iomap_invalidate_folio(struct folio *folio, size_t offset, size_t len);
int iomap_file_unshare(struct inode *inode, loff_t pos, loff_t len,
const struct iomap_ops *ops);
-bool iomap_want_unshare_iter(const struct iomap_iter *iter);
int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len,
bool *did_zero, const struct iomap_ops *ops);
int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
