From: Darrick J. Wong <djwong@xxxxxxxxxx>
Source kernel commit: 5769aa41ee34d4d1cc2b35376107b8e9694698f0
Add a couple of utility functions to set or remove parent pointers from
a file. These functions will be used by repair code, hence they skip
the xattr logging that regular parent pointer updates use.
Signed-off-by: Darrick J. Wong <djwong@xxxxxxxxxx>
Reviewed-by: Christoph Hellwig <hch@xxxxxx>
---
libxfs/xfs_dir2.c | 2 +-
libxfs/xfs_dir2.h | 2 +-
libxfs/xfs_parent.c | 64 +++++++++++++++++++++++++++++++++++++++++++++++++++
libxfs/xfs_parent.h | 6 +++++
4 files changed, 72 insertions(+), 2 deletions(-)
diff --git a/libxfs/xfs_dir2.c b/libxfs/xfs_dir2.c
index 803fb82b2..e309e1e58 100644
--- a/libxfs/xfs_dir2.c
+++ b/libxfs/xfs_dir2.c
@@ -433,7 +433,7 @@ int
xfs_dir_removename(
struct xfs_trans *tp,
struct xfs_inode *dp,
- struct xfs_name *name,
+ const struct xfs_name *name,
xfs_ino_t ino,
xfs_extlen_t total) /* bmap's total block count */
{
diff --git a/libxfs/xfs_dir2.h b/libxfs/xfs_dir2.h
index eb3a5c350..b580a78bc 100644
--- a/libxfs/xfs_dir2.h
+++ b/libxfs/xfs_dir2.h
@@ -58,7 +58,7 @@ extern int xfs_dir_lookup(struct xfs_trans *tp, struct xfs_inode *dp,
const struct xfs_name *name, xfs_ino_t *inum,
struct xfs_name *ci_name);
extern int xfs_dir_removename(struct xfs_trans *tp, struct xfs_inode *dp,
- struct xfs_name *name, xfs_ino_t ino,
+ const struct xfs_name *name, xfs_ino_t ino,
xfs_extlen_t tot);
extern int xfs_dir_replace(struct xfs_trans *tp, struct xfs_inode *dp,
const struct xfs_name *name, xfs_ino_t inum,
diff --git a/libxfs/xfs_parent.c b/libxfs/xfs_parent.c
index 8c29ba61c..84220f10a 100644
--- a/libxfs/xfs_parent.c
+++ b/libxfs/xfs_parent.c
@@ -310,3 +310,67 @@ xfs_parent_lookup(
xfs_parent_da_args_init(scratch, tp, pptr, ip, ip->i_ino, parent_name);
return xfs_attr_get_ilocked(scratch);
}
+
+/* Sanity-check a parent pointer before we try to perform repairs. */
+static inline bool
+xfs_parent_sanity_check(
+ struct xfs_mount *mp,
+ const struct xfs_name *parent_name,
+ const struct xfs_parent_rec *pptr)
+{
+ if (!xfs_parent_namecheck(XFS_ATTR_PARENT, parent_name->name,
+ parent_name->len))
+ return false;
+
+ if (!xfs_parent_valuecheck(mp, pptr, sizeof(*pptr)))
+ return false;
+
+ return true;
+}
+
+
+/*
+ * Attach the parent pointer (@parent_name -> @pptr) to @ip immediately.
+ * Caller must not have a transaction or hold the ILOCK. This is for
+ * specialized repair functions only. The scratchpad need not be initialized.
+ */
+int
+xfs_parent_set(
+ struct xfs_inode *ip,
+ xfs_ino_t owner,
+ const struct xfs_name *parent_name,
+ struct xfs_parent_rec *pptr,
+ struct xfs_da_args *scratch)
+{
+ if (!xfs_parent_sanity_check(ip->i_mount, parent_name, pptr)) {
+ ASSERT(0);
+ return -EFSCORRUPTED;
+ }
+
+ memset(scratch, 0, sizeof(struct xfs_da_args));
+ xfs_parent_da_args_init(scratch, NULL, pptr, ip, owner, parent_name);
+ return xfs_attr_set(scratch, XFS_ATTRUPDATE_CREATE, false);
+}
+
+/*
+ * Remove the parent pointer (@parent_name -> @pptr) from @ip immediately.
+ * Caller must not have a transaction or hold the ILOCK. This is for
+ * specialized repair functions only. The scratchpad need not be initialized.
+ */
+int
+xfs_parent_unset(
+ struct xfs_inode *ip,
+ xfs_ino_t owner,
+ const struct xfs_name *parent_name,
+ struct xfs_parent_rec *pptr,
+ struct xfs_da_args *scratch)
+{
+ if (!xfs_parent_sanity_check(ip->i_mount, parent_name, pptr)) {
+ ASSERT(0);
+ return -EFSCORRUPTED;
+ }
+
+ memset(scratch, 0, sizeof(struct xfs_da_args));
+ xfs_parent_da_args_init(scratch, NULL, pptr, ip, owner, parent_name);
+ return xfs_attr_set(scratch, XFS_ATTRUPDATE_REMOVE, false);
+}
diff --git a/libxfs/xfs_parent.h b/libxfs/xfs_parent.h
index 977885823..b8036527c 100644
--- a/libxfs/xfs_parent.h
+++ b/libxfs/xfs_parent.h
@@ -100,5 +100,11 @@ int xfs_parent_from_attr(struct xfs_mount *mp, unsigned int attr_flags,
int xfs_parent_lookup(struct xfs_trans *tp, struct xfs_inode *ip,
const struct xfs_name *name, struct xfs_parent_rec *pptr,
struct xfs_da_args *scratch);
+int xfs_parent_set(struct xfs_inode *ip, xfs_ino_t owner,
+ const struct xfs_name *name, struct xfs_parent_rec *pptr,
+ struct xfs_da_args *scratch);
+int xfs_parent_unset(struct xfs_inode *ip, xfs_ino_t owner,
+ const struct xfs_name *name, struct xfs_parent_rec *pptr,
+ struct xfs_da_args *scratch);
#endif /* __XFS_PARENT_H__ */
