linux-kernel - [PATCH RFC 04/10] xfs: Make xfs_find_trim_cow

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Message-Id: <20250204120127.2396727-5-john.g.garry@oracle.com>
Date: Tue,  4 Feb 2025 12:01:21 +0000
From: John Garry <john.g.garry@...cle.com>
To: brauner@...nel.org, djwong@...nel.org, cem@...nel.org, dchinner@...hat.com,
        hch@....de
Cc: linux-xfs@...r.kernel.org, linux-fsdevel@...r.kernel.org,
        linux-kernel@...r.kernel.org, ojaswin@...ux.ibm.com,
        ritesh.list@...il.com, martin.petersen@...cle.com,
        John Garry <john.g.garry@...cle.com>
Subject: [PATCH RFC 04/10] xfs: Make xfs_find_trim_cow_extent() public

This will be required for the iomap code to detect whether a range is
covered by a CoW extent.

Signed-off-by: John Garry <john.g.garry@...cle.com>
---
 fs/xfs/xfs_reflink.c | 2 +-
 fs/xfs/xfs_reflink.h | 2 ++
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 580469668334..b28fb632b9e6 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -357,7 +357,7 @@ xfs_reflink_convert_cow(
  * is not shared we might have a preallocation for it in the COW fork. If so we
  * use it that rather than trigger a new allocation.
  */
-static int
+int
 xfs_find_trim_cow_extent(
 	struct xfs_inode	*ip,
 	struct xfs_bmbt_irec	*imap,
diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h
index cc4e92278279..a328b25e68da 100644
--- a/fs/xfs/xfs_reflink.h
+++ b/fs/xfs/xfs_reflink.h
@@ -35,6 +35,8 @@ int xfs_reflink_allocate_cow(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
 		bool convert_now);
 extern int xfs_reflink_convert_cow(struct xfs_inode *ip, xfs_off_t offset,
 		xfs_off_t count);
+int xfs_find_trim_cow_extent(struct xfs_inode *ip, struct xfs_bmbt_irec *imap,
+	struct xfs_bmbt_irec *cmap, bool *shared, bool *found);
 
 extern int xfs_reflink_cancel_cow_blocks(struct xfs_inode *ip,
 		struct xfs_trans **tpp, xfs_fileoff_t offset_fsb,
-- 
2.31.1