Hi,
this is supposed to fix the issue while trying to print a non attr3
block using attr3 type, which ends up on an ASSERT, and crashing xfs_db.
This is based on Eric's suggestion, which an attempt to print the
possible magic number from the current block.
As Eric mentioned, there are other types which need such handling too,
but, this is supposed to be a RFC to get comments on the approach. Once
we agree how to fix it, I'll fix the remaining types accordingly.
This is the following output of an attempt to print a non attr3 type block,
with this patch:
xfs_db> fsblock 2
xfs_db> type attr3
Unknown attribute buffer type!
Unknown attribute buffer type!
xfs_db> p
Unrecognized attr3 block, possible magic number:
Unrecognized attr3 block, possible magic number:
hdr.magic = 0x41423343
While, printing a correct attr3 block, nothing is changed:
xfs_db> fsblock 11
xfs_db> type attr3
xfs_db> p
hdr.info.hdr.forw = 0
hdr.info.hdr.back = 0
hdr.info.hdr.magic = 0x3ebe
hdr.info.crc = 0x6f7911f7 (correct)
hdr.info.bno = 88
.
.
.
Comments?
Cheers
Signed-off-by: Carlos Maiolino <cmaiolino@xxxxxxxxxx>
---
db/attr.c | 22 ++++++++++++++++++++++
db/attr.h | 1 +
db/field.c | 2 ++
db/field.h | 1 +
4 files changed, 26 insertions(+)
diff --git a/db/attr.c b/db/attr.c
index 9cbb20d3..b7692e9e 100644
--- a/db/attr.c
+++ b/db/attr.c
@@ -523,6 +523,21 @@ attr3_remote_hdr_count(
return be32_to_cpu(node->rm_magic) == XFS_ATTR3_RMT_MAGIC;
}
+static int
+attr3_unkown_hdr_count(
+ void *obj,
+ int startoff)
+{
+ if (!attr3_leaf_hdr_count(obj, startoff) &&
+ !attr3_node_hdr_count(obj, startoff) &&
+ !attr3_remote_hdr_count(obj,startoff)) {
+ dbprintf(_("Unrecognized attr3 block, possible magic number:\n"));
+ return 1;
+ }
+
+ return 0;
+}
+
int
attr_size(
void *obj,
@@ -549,6 +564,8 @@ const field_t attr3_flds[] = {
FLD_COUNT, TYP_NONE },
{ "hdr", FLDT_ATTR3_REMOTE_HDR, OI(0), attr3_remote_hdr_count,
FLD_COUNT, TYP_NONE },
+ { "hdr", FLDT_ATTR3_UNKOWN_HDR, OI(0), attr3_unkown_hdr_count,
+ FLD_COUNT, TYP_NONE },
{ "data", FLDT_CHARNS, OI(bitize(sizeof(struct xfs_attr3_rmt_hdr))),
attr3_remote_data_count, FLD_COUNT, TYP_NONE },
{ "entries", FLDT_ATTR_LEAF_ENTRY, OI(L3OFF(entries)),
@@ -606,6 +623,11 @@ const struct field attr3_remote_crc_flds[] = {
{ NULL }
};
+const struct field attr3_unkown_flds[] = {
+ { "magic", FLDT_UINT32X, 0, C1, 0, TYP_NONE},
+ { NULL }
+};
+
/* Set the CRC. */
void
xfs_attr3_set_crc(
diff --git a/db/attr.h b/db/attr.h
index ba23480c..a8566a8c 100644
--- a/db/attr.h
+++ b/db/attr.h
@@ -33,6 +33,7 @@ extern const field_t attr3_node_hdr_flds[];
extern const field_t attr3_blkinfo_flds[];
extern const field_t attr3_node_hdr_flds[];
extern const field_t attr3_remote_crc_flds[];
+extern const field_t attr3_unkown_flds[];
extern int attr_leaf_name_size(void *obj, int startoff, int idx);
extern int attr_size(void *obj, int startoff, int idx);
diff --git a/db/field.c b/db/field.c
index ae4c8057..388bcbe1 100644
--- a/db/field.c
+++ b/db/field.c
@@ -102,6 +102,8 @@ const ftattr_t ftattrtab[] = {
{ FLDT_ATTR3_REMOTE_HDR, "attr3_remote_hdr", NULL,
(char *)attr3_remote_crc_flds, attr_size, FTARG_SIZE, NULL,
attr3_remote_crc_flds },
+ { FLDT_ATTR3_UNKOWN_HDR, "attr3_unkown_hdr", NULL,
+ NULL, NULL, FTARG_SIZE, NULL, attr3_unkown_flds},
{ FLDT_BMAPBTA, "bmapbta", NULL, (char *)bmapbta_flds, btblock_size,
FTARG_SIZE, NULL, bmapbta_flds },
diff --git a/db/field.h b/db/field.h
index a8df29bc..291ef2e5 100644
--- a/db/field.h
+++ b/db/field.h
@@ -48,6 +48,7 @@ typedef enum fldt {
FLDT_ATTR3_LEAF_HDR,
FLDT_ATTR3_NODE_HDR,
FLDT_ATTR3_REMOTE_HDR,
+ FLDT_ATTR3_UNKOWN_HDR,
FLDT_BMAPBTA,
FLDT_BMAPBTA_CRC,
--
2.14.3
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