From: Darrick J. Wong <djwong@xxxxxxxxxx>
Create a new libxfs function to link an existing inode into a directory.
The upcoming metadata directory feature will need this to create a
metadata directory tree.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
---
libxfs/xfs_dir2.c | 51 +++++++++++++++++++++++++++++++++++++++++++++++++++
libxfs/xfs_dir2.h | 3 +++
2 files changed, 54 insertions(+)
diff --git a/libxfs/xfs_dir2.c b/libxfs/xfs_dir2.c
index ed52969b45d..8755ef615f8 100644
--- a/libxfs/xfs_dir2.c
+++ b/libxfs/xfs_dir2.c
@@ -21,6 +21,7 @@
#include "xfs_shared.h"
#include "xfs_bmap_btree.h"
#include "xfs_trans_space.h"
+#include "xfs_ag.h"
const struct xfs_name xfs_name_dotdot = {
.name = (const unsigned char *)"..",
@@ -825,3 +826,53 @@ xfs_dir_create_new_child(
xfs_bumplink(tp, dp);
return 0;
}
+
+/*
+ * Given a directory @dp, an existing non-directory inode @ip, and a @name,
+ * link @ip into @dp under the given @name. Both inodes must have the ILOCK
+ * held.
+ */
+int
+xfs_dir_link_existing_child(
+ struct xfs_trans *tp,
+ uint resblks,
+ struct xfs_inode *dp,
+ struct xfs_name *name,
+ struct xfs_inode *ip)
+{
+ struct xfs_mount *mp = tp->t_mountp;
+ int error;
+
+ ASSERT(xfs_isilocked(ip, XFS_ILOCK_EXCL));
+ ASSERT(xfs_isilocked(dp, XFS_ILOCK_EXCL));
+ ASSERT(!S_ISDIR(VFS_I(ip)->i_mode));
+
+ if (!resblks) {
+ error = xfs_dir_canenter(tp, dp, name);
+ if (error)
+ return error;
+ }
+
+ /*
+ * Handle initial link state of O_TMPFILE inode
+ */
+ if (VFS_I(ip)->i_nlink == 0) {
+ struct xfs_perag *pag;
+
+ pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
+ error = xfs_iunlink_remove(tp, pag, ip);
+ xfs_perag_put(pag);
+ if (error)
+ return error;
+ }
+
+ error = xfs_dir_createname(tp, dp, name, ip->i_ino, resblks);
+ if (error)
+ return error;
+
+ xfs_trans_ichgtime(tp, dp, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG);
+ xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
+
+ xfs_bumplink(tp, ip);
+ return 0;
+}
diff --git a/libxfs/xfs_dir2.h b/libxfs/xfs_dir2.h
index d3e7607c0e9..4afade8b087 100644
--- a/libxfs/xfs_dir2.h
+++ b/libxfs/xfs_dir2.h
@@ -256,5 +256,8 @@ bool xfs_dir2_namecheck(const void *name, size_t length);
int xfs_dir_create_new_child(struct xfs_trans *tp, uint resblks,
struct xfs_inode *dp, struct xfs_name *name,
struct xfs_inode *ip);
+int xfs_dir_link_existing_child(struct xfs_trans *tp, uint resblks,
+ struct xfs_inode *dp, struct xfs_name *name,
+ struct xfs_inode *ip);
#endif /* __XFS_DIR2_H__ */
