[PATCH v6 09/13] xfs: add XFS_REFLINK_ALLOC_EXTSZALIGN

John Garry
2025-03-13T17:13:52Z

Add a flag for the xfs_reflink_allocate_cow() API to allow the caller
indirectly set XFS_BMAPI_EXTSZALIGN.

Signed-off-by: John Garry <john.g.garry@oracle.com>
---
fs/xfs/xfs_reflink.c | 8 ++++++--
fs/xfs/xfs_reflink.h | 2 ++
2 files changed, 8 insertions(+), 2 deletions(-)

diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index 690b1eefeb0e..9a419af89949 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -444,6 +444,11 @@ xfs_reflink_fill_cow_hole(
int nimaps;
int error;
bool found;
+ uint32_t bmapi_flags = XFS_BMAPI_COWFORK |
+ XFS_BMAPI_PREALLOC;
+
+ if (flags & XFS_REFLINK_ALLOC_EXTSZALIGN)
+ bmapi_flags |= XFS_BMAPI_EXTSZALIGN;

resaligned = xfs_aligned_fsb_count(imap->br_startoff,
imap->br_blockcount, xfs_get_cowextsz_hint(ip));
@@ -477,8 +482,7 @@ xfs_reflink_fill_cow_hole(
/* Allocate the entire reservation as unwritten blocks. */
nimaps = 1;
error = xfs_bmapi_write(tp, ip, imap->br_startoff, imap->br_blockcount,
- XFS_BMAPI_COWFORK | XFS_BMAPI_PREALLOC, 0, cmap,
- &nimaps);
+ bmapi_flags, 0, cmap, &nimaps);
if (error)
goto out_trans_cancel;

diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h
index f4115836064b..0ab1857074e5 100644
--- a/fs/xfs/xfs_reflink.h
+++ b/fs/xfs/xfs_reflink.h
@@ -13,6 +13,8 @@
#define XFS_REFLINK_CONVERT_UNWRITTEN (1u << 0)
/* force a new COW mapping to be allocated */
#define XFS_REFLINK_FORCE_COW (1u << 1)
+/* request block allocations aligned to extszhint */
+#define XFS_REFLINK_ALLOC_EXTSZALIGN (1u << 2)

/*
* Check whether it is safe to free COW fork blocks from an inode. It is unsafe
--
2.31.1