[04/64] xfs: hoist extent size helpers to libxfs

Commit Message

Darrick J. Wong Oct. 2, 2024, 1:08 a.m. UTC

From: Darrick J. Wong <[e-mail]>

Source kernel commit: acdddbe168040372a8b6b9b5876b92b715322910

Move the extent size helpers to xfs_bmap.c in libxfs since they're used
there already.

Signed-off-by: Darrick J. Wong <[e-mail]>
Reviewed-by: Christoph Hellwig <[e-mail]>
---
 include/xfs_inode.h  |    7 +++++++
 libxfs/libxfs_priv.h |    2 --
 libxfs/xfs_bmap.c    |   42 ++++++++++++++++++++++++++++++++++++++++++
 libxfs/xfs_bmap.h    |    3 +++
 4 files changed, 52 insertions(+), 2 deletions(-)

Patch

diff --git a/include/xfs_inode.h b/include/xfs_inode.h
index 9bbf37225..ec4eada81 100644
--- a/include/xfs_inode.h
+++ b/include/xfs_inode.h
@@ -345,6 +345,11 @@  static inline bool xfs_inode_has_bigrtalloc(struct xfs_inode *ip)
 	return XFS_IS_REALTIME_INODE(ip) && ip->i_mount->m_sb.sb_rextsize > 1;
 }
 
+static inline bool xfs_is_always_cow_inode(struct xfs_inode *ip)
+{
+	return false;
+}
+
 /* Always set the child's GID to this value, even if the parent is setgid. */
 #define CRED_FORCE_GID	(1U << 0)
 struct cred {
@@ -370,4 +375,6 @@  extern int	libxfs_iget(struct xfs_mount *, struct xfs_trans *, xfs_ino_t,
 				uint, struct xfs_inode **);
 extern void	libxfs_irele(struct xfs_inode *ip);
 
+#define XFS_DEFAULT_COWEXTSZ_HINT	32
+
 #endif /* __XFS_INODE_H__ */
diff --git a/libxfs/libxfs_priv.h b/libxfs/libxfs_priv.h
index 5d1aa23c7..0bf0c54ac 100644
--- a/libxfs/libxfs_priv.h
+++ b/libxfs/libxfs_priv.h
@@ -468,8 +468,6 @@  xfs_buf_readahead(
 
 #define xfs_rotorstep				1
 #define xfs_bmap_rtalloc(a)			(-ENOSYS)
-#define xfs_get_extsz_hint(ip)			(0)
-#define xfs_get_cowextsz_hint(ip)		(0)
 #define xfs_inode_is_filestream(ip)		(0)
 #define xfs_filestream_lookup_ag(ip)		(0)
 #define xfs_filestream_new_ag(ip,ag)		(0)
diff --git a/libxfs/xfs_bmap.c b/libxfs/xfs_bmap.c
index e60d11470..befbe0b07 100644
--- a/libxfs/xfs_bmap.c
+++ b/libxfs/xfs_bmap.c
@@ -6448,3 +6448,45 @@  xfs_bmap_query_all(
 
 	return xfs_btree_query_all(cur, xfs_bmap_query_range_helper, &query);
 }
+
+/* Helper function to extract extent size hint from inode */
+xfs_extlen_t
+xfs_get_extsz_hint(
+	struct xfs_inode	*ip)
+{
+	/*
+	 * No point in aligning allocations if we need to COW to actually
+	 * write to them.
+	 */
+	if (xfs_is_always_cow_inode(ip))
+		return 0;
+	if ((ip->i_diflags & XFS_DIFLAG_EXTSIZE) && ip->i_extsize)
+		return ip->i_extsize;
+	if (XFS_IS_REALTIME_INODE(ip) &&
+	    ip->i_mount->m_sb.sb_rextsize > 1)
+		return ip->i_mount->m_sb.sb_rextsize;
+	return 0;
+}
+
+/*
+ * Helper function to extract CoW extent size hint from inode.
+ * Between the extent size hint and the CoW extent size hint, we
+ * return the greater of the two.  If the value is zero (automatic),
+ * use the default size.
+ */
+xfs_extlen_t
+xfs_get_cowextsz_hint(
+	struct xfs_inode	*ip)
+{
+	xfs_extlen_t		a, b;
+
+	a = 0;
+	if (ip->i_diflags2 & XFS_DIFLAG2_COWEXTSIZE)
+		a = ip->i_cowextsize;
+	b = xfs_get_extsz_hint(ip);
+
+	a = max(a, b);
+	if (a == 0)
+		return XFS_DEFAULT_COWEXTSZ_HINT;
+	return a;
+}
diff --git a/libxfs/xfs_bmap.h b/libxfs/xfs_bmap.h
index 667b0c2b3..7592d46e9 100644
--- a/libxfs/xfs_bmap.h
+++ b/libxfs/xfs_bmap.h
@@ -296,4 +296,7 @@  typedef int (*xfs_bmap_query_range_fn)(
 int xfs_bmap_query_all(struct xfs_btree_cur *cur, xfs_bmap_query_range_fn fn,
 		void *priv);
 
+xfs_extlen_t	xfs_get_extsz_hint(struct xfs_inode *ip);
+xfs_extlen_t	xfs_get_cowextsz_hint(struct xfs_inode *ip);
+
 #endif	/* __XFS_BMAP_H__ */