From: Darrick J. Wong <djwong@xxxxxxxxxx>
Source kernel commit: c1f0bad4232fd309b2fe849153fcf473e775b1f7
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>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
libxfs/xfs_dir2.c | 71 +++++++++++++++++++++++++++++++++++++++++++++++++++--
libxfs/xfs_dir2.h | 4 ++-
2 files changed, 71 insertions(+), 4 deletions(-)
diff --git a/libxfs/xfs_dir2.c b/libxfs/xfs_dir2.c
index e98b28024..802b9a1b3 100644
--- a/libxfs/xfs_dir2.c
+++ b/libxfs/xfs_dir2.c
@@ -21,6 +21,7 @@
#include "xfs_bmap_btree.h"
#include "xfs_trans_space.h"
#include "xfs_parent.h"
+#include "xfs_ag.h"
const struct xfs_name xfs_name_dotdot = {
.name = (const unsigned char *)"..",
@@ -586,9 +587,9 @@ xfs_dir_replace(
*/
int
xfs_dir_canenter(
- xfs_trans_t *tp,
- xfs_inode_t *dp,
- struct xfs_name *name) /* name of entry to add */
+ struct xfs_trans *tp,
+ struct xfs_inode *dp,
+ const struct xfs_name *name) /* name of entry to add */
{
return xfs_dir_createname(tp, dp, name, 0, 0);
}
@@ -808,3 +809,67 @@ xfs_dir_create_child(
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_add_child(
+ struct xfs_trans *tp,
+ unsigned int resblks,
+ struct xfs_dir_update *du)
+{
+ struct xfs_inode *dp = du->dp;
+ const struct xfs_name *name = du->name;
+ struct xfs_inode *ip = du->ip;
+ struct xfs_mount *mp = tp->t_mountp;
+ int error;
+
+ xfs_assert_ilocked(ip, XFS_ILOCK_EXCL);
+ xfs_assert_ilocked(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);
+
+ /*
+ * If we have parent pointers, we now need to add the parent record to
+ * the attribute fork of the inode. If this is the initial parent
+ * attribute, we need to create it correctly, otherwise we can just add
+ * the parent to the inode.
+ */
+ if (du->ppargs) {
+ error = xfs_parent_addname(tp, du->ppargs, dp, name, ip);
+ if (error)
+ return error;
+ }
+
+ return 0;
+}
diff --git a/libxfs/xfs_dir2.h b/libxfs/xfs_dir2.h
index a1ba6fd0a..4f9711509 100644
--- a/libxfs/xfs_dir2.h
+++ b/libxfs/xfs_dir2.h
@@ -74,7 +74,7 @@ extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp,
const struct xfs_name *name, xfs_ino_t inum,
xfs_extlen_t tot);
extern int xfs_dir_canenter(struct xfs_trans *tp, struct xfs_inode *dp,
- struct xfs_name *name);
+ const struct xfs_name *name);
int xfs_dir_lookup_args(struct xfs_da_args *args);
int xfs_dir_createname_args(struct xfs_da_args *args);
@@ -320,5 +320,7 @@ struct xfs_dir_update {
int xfs_dir_create_child(struct xfs_trans *tp, unsigned int resblks,
struct xfs_dir_update *du);
+int xfs_dir_add_child(struct xfs_trans *tp, unsigned int resblks,
+ struct xfs_dir_update *du);
#endif /* __XFS_DIR2_H__ */
