diff mbox series

[15/24] xfs_db: report parent pointers embedded in xattrs

Message ID 172229850714.1350924.16080767930927648394.stgit@frogsfrogsfrogs (mailing list archive)
State Accepted, archived
Headers show
Series [01/24] libxfs: create attr log item opcodes and formats for parent pointers | expand

Commit Message

Darrick J. Wong July 30, 2024, 1:22 a.m. UTC 
From: Darrick J. Wong <djwong@kernel.org>

Decode the parent pointer inode, generation, and name fields if the
parent pointer passes basic validation checks.

Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
 db/attr.c      |   28 ++++++++++++++++++++++++++++
 db/attrshort.c |   24 ++++++++++++++++++++++++
 db/field.c     |   10 ++++++++++
 db/field.h     |    3 +++
 4 files changed, 65 insertions(+)
diff mbox series

Patch

diff --git a/db/attr.c b/db/attr.c
index 3252f3886..3b556c43d 100644
--- a/db/attr.c
+++ b/db/attr.c
@@ -33,6 +33,8 @@  static int	attr_remote_data_count(void *obj, int startoff);
 static int	attr3_remote_hdr_count(void *obj, int startoff);
 static int	attr3_remote_data_count(void *obj, int startoff);
 
+static int	attr_leaf_value_pptr_count(void *obj, int startoff);
+
 const field_t	attr_hfld[] = {
 	{ "", FLDT_ATTR, OI(0), C1, 0, TYP_NONE },
 	{ NULL }
@@ -118,6 +120,8 @@  const field_t	attr_leaf_name_flds[] = {
 	  attr_leaf_name_local_count, FLD_COUNT, TYP_NONE },
 	{ "name", FLDT_CHARNS, OI(LNOFF(nameval)),
 	  attr_leaf_name_local_name_count, FLD_COUNT, TYP_NONE },
+	{ "parent_dir", FLDT_PARENT_REC, attr_leaf_name_local_value_offset,
+	  attr_leaf_value_pptr_count, FLD_COUNT | FLD_OFFSET, TYP_NONE },
 	{ "value", FLDT_CHARNS, attr_leaf_name_local_value_offset,
 	  attr_leaf_name_local_value_count, FLD_COUNT|FLD_OFFSET, TYP_NONE },
 	{ "valueblk", FLDT_UINT32X, OI(LVOFF(valueblk)),
@@ -307,6 +311,8 @@  __attr_leaf_name_local_value_count(
 
 	if (!(e->flags & XFS_ATTR_LOCAL))
 		return 0;
+	if ((e->flags & XFS_ATTR_NSP_ONDISK_MASK) == XFS_ATTR_PARENT)
+		return 0;
 
 	l = xfs_attr3_leaf_name_local(leaf, i);
 	return be16_to_cpu(l->valuelen);
@@ -514,6 +520,28 @@  attr3_remote_hdr_count(
 	return be32_to_cpu(node->rm_magic) == XFS_ATTR3_RMT_MAGIC;
 }
 
+static int
+__leaf_pptr_count(
+	struct xfs_attr_leafblock	*leaf,
+	struct xfs_attr_leaf_entry      *e,
+	int				i)
+{
+	if (!(e->flags & XFS_ATTR_LOCAL))
+		return 0;
+	if ((e->flags & XFS_ATTR_NSP_ONDISK_MASK) != XFS_ATTR_PARENT)
+		return 0;
+
+	return 1;
+}
+
+static int
+attr_leaf_value_pptr_count(
+	void				*obj,
+	int				startoff)
+{
+	return attr_leaf_entry_walk(obj, startoff, __leaf_pptr_count);
+}
+
 int
 attr_size(
 	void	*obj,
diff --git a/db/attrshort.c b/db/attrshort.c
index 978f58d67..7e5c94ca5 100644
--- a/db/attrshort.c
+++ b/db/attrshort.c
@@ -18,6 +18,8 @@  static int	attr_sf_entry_value_offset(void *obj, int startoff, int idx);
 static int	attr_shortform_list_count(void *obj, int startoff);
 static int	attr_shortform_list_offset(void *obj, int startoff, int idx);
 
+static int	attr_sf_entry_pptr_count(void *obj, int startoff);
+
 const field_t	attr_shortform_flds[] = {
 	{ "hdr", FLDT_ATTR_SF_HDR, OI(0), C1, 0, TYP_NONE },
 	{ "list", FLDT_ATTR_SF_ENTRY, attr_shortform_list_offset,
@@ -48,6 +50,8 @@  const field_t	attr_sf_entry_flds[] = {
 	  TYP_NONE },
 	{ "name", FLDT_CHARNS, OI(EOFF(nameval)), attr_sf_entry_name_count,
 	  FLD_COUNT, TYP_NONE },
+	{ "parent_dir", FLDT_PARENT_REC, attr_sf_entry_value_offset,
+	  attr_sf_entry_pptr_count, FLD_COUNT | FLD_OFFSET, TYP_NONE },
 	{ "value", FLDT_CHARNS, attr_sf_entry_value_offset,
 	  attr_sf_entry_value_count, FLD_COUNT|FLD_OFFSET, TYP_NONE },
 	{ NULL }
@@ -92,6 +96,10 @@  attr_sf_entry_value_count(
 
 	ASSERT(bitoffs(startoff) == 0);
 	e = (struct xfs_attr_sf_entry *)((char *)obj + byteize(startoff));
+
+	if ((e->flags & XFS_ATTR_NSP_ONDISK_MASK) == XFS_ATTR_PARENT)
+		return 0;
+
 	return e->valuelen;
 }
 
@@ -159,3 +167,19 @@  attrshort_size(
 		e = xfs_attr_sf_nextentry(e);
 	return bitize((int)((char *)e - (char *)hdr));
 }
+
+static int
+attr_sf_entry_pptr_count(
+	void				*obj,
+	int				startoff)
+{
+	struct xfs_attr_sf_entry	*e;
+
+	ASSERT(bitoffs(startoff) == 0);
+	e = (struct xfs_attr_sf_entry *)((char *)obj + byteize(startoff));
+
+	if ((e->flags & XFS_ATTR_NSP_ONDISK_MASK) != XFS_ATTR_PARENT)
+		return 0;
+
+	return 1;
+}
diff --git a/db/field.c b/db/field.c
index a3e47ee81..a61ccc9ef 100644
--- a/db/field.c
+++ b/db/field.c
@@ -24,6 +24,14 @@ 
 #include "dir2sf.h"
 #include "symlink.h"
 
+#define	PPOFF(f)	bitize(offsetof(struct xfs_parent_rec, f))
+const field_t		parent_flds[] = {
+	{ "inumber", FLDT_INO, OI(PPOFF(p_ino)), C1, 0, TYP_INODE },
+	{ "gen", FLDT_UINT32D, OI(PPOFF(p_gen)), C1, 0, TYP_NONE },
+	{ NULL }
+};
+#undef PPOFF
+
 const ftattr_t	ftattrtab[] = {
 	{ FLDT_AGBLOCK, "agblock", fp_num, "%u", SI(bitsz(xfs_agblock_t)),
 	  FTARG_DONULL, fa_agblock, NULL },
@@ -384,6 +392,8 @@  const ftattr_t	ftattrtab[] = {
 	{ FLDT_UINT8X, "uint8x", fp_num, "%#x", SI(bitsz(uint8_t)), 0, NULL,
 	  NULL },
 	{ FLDT_UUID, "uuid", fp_uuid, NULL, SI(bitsz(uuid_t)), 0, NULL, NULL },
+	{ FLDT_PARENT_REC, "parent", NULL, (char *)parent_flds,
+	  SI(bitsz(struct xfs_parent_rec)), 0, NULL, parent_flds },
 	{ FLDT_ZZZ, NULL }
 };
 
diff --git a/db/field.h b/db/field.h
index 634742a57..b1bfdbed1 100644
--- a/db/field.h
+++ b/db/field.h
@@ -187,6 +187,9 @@  typedef enum fldt	{
 	FLDT_UINT8O,
 	FLDT_UINT8X,
 	FLDT_UUID,
+
+	FLDT_PARENT_REC,
+
 	FLDT_ZZZ			/* mark last entry */
 } fldt_t;