From: Liu Bo <bo.li....@oracle.com>
3.12-stable review patch. If anyone has any objections, please let me know.
===============
commit 6eda71d0c030af0fc2f68aaa676e6d445600855b upstream.
The skinny extents are intepreted incorrectly in scrub_print_warning(),
and end up hitting the BUG() in btrfs_extent_inline_ref_size.
Reported-by: Konstantinos Skarlatos <k.skarla...@gmail.com>
Signed-off-by: Liu Bo <bo.li....@oracle.com>
Signed-off-by: Chris Mason <c...@fb.com>
Signed-off-by: Jiri Slaby <jsl...@suse.cz>
---
fs/btrfs/backref.c | 30 +++++++++++++++++++-----------
fs/btrfs/backref.h | 4 ++--
fs/btrfs/scrub.c | 5 +++--
3 files changed, 24 insertions(+), 15 deletions(-)
diff --git a/fs/btrfs/backref.c b/fs/btrfs/backref.c
index 79559682255a..1f4ce7ac144d 100644
--- a/fs/btrfs/backref.c
+++ b/fs/btrfs/backref.c
@@ -1390,9 +1390,10 @@ int extent_from_logical(struct btrfs_fs_info *fs_info,
u64 logical,
* returns <0 on error
*/
static int __get_extent_inline_ref(unsigned long *ptr, struct extent_buffer
*eb,
- struct btrfs_extent_item *ei, u32 item_size,
- struct btrfs_extent_inline_ref **out_eiref,
- int *out_type)
+ struct btrfs_key *key,
+ struct btrfs_extent_item *ei, u32 item_size,
+ struct btrfs_extent_inline_ref **out_eiref,
+ int *out_type)
{
unsigned long end;
u64 flags;
@@ -1402,9 +1403,16 @@ static int __get_extent_inline_ref(unsigned long *ptr,
struct extent_buffer *eb,
/* first call */
flags = btrfs_extent_flags(eb, ei);
if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
- info = (struct btrfs_tree_block_info *)(ei + 1);
- *out_eiref =
- (struct btrfs_extent_inline_ref *)(info + 1);
+ if (key->type == BTRFS_METADATA_ITEM_KEY) {
+ /* a skinny metadata extent */
+ *out_eiref =
+ (struct btrfs_extent_inline_ref *)(ei + 1);
+ } else {
+ WARN_ON(key->type != BTRFS_EXTENT_ITEM_KEY);
+ info = (struct btrfs_tree_block_info *)(ei + 1);
+ *out_eiref =
+ (struct btrfs_extent_inline_ref *)(info + 1);
+ }
} else {
*out_eiref = (struct btrfs_extent_inline_ref *)(ei + 1);
}
@@ -1414,7 +1422,7 @@ static int __get_extent_inline_ref(unsigned long *ptr,
struct extent_buffer *eb,
}
end = (unsigned long)ei + item_size;
- *out_eiref = (struct btrfs_extent_inline_ref *)*ptr;
+ *out_eiref = (struct btrfs_extent_inline_ref *)(*ptr);
*out_type = btrfs_extent_inline_ref_type(eb, *out_eiref);
*ptr += btrfs_extent_inline_ref_size(*out_type);
@@ -1433,8 +1441,8 @@ static int __get_extent_inline_ref(unsigned long *ptr,
struct extent_buffer *eb,
* <0 on error.
*/
int tree_backref_for_extent(unsigned long *ptr, struct extent_buffer *eb,
- struct btrfs_extent_item *ei, u32 item_size,
- u64 *out_root, u8 *out_level)
+ struct btrfs_key *key, struct btrfs_extent_item *ei,
+ u32 item_size, u64 *out_root, u8 *out_level)
{
int ret;
int type;
@@ -1445,8 +1453,8 @@ int tree_backref_for_extent(unsigned long *ptr, struct
extent_buffer *eb,
return 1;
while (1) {
- ret = __get_extent_inline_ref(ptr, eb, ei, item_size,
- &eiref, &type);
+ ret = __get_extent_inline_ref(ptr, eb, key, ei, item_size,
+ &eiref, &type);
if (ret < 0)
return ret;
diff --git a/fs/btrfs/backref.h b/fs/btrfs/backref.h
index a910b27a8ad9..519b49e51f57 100644
--- a/fs/btrfs/backref.h
+++ b/fs/btrfs/backref.h
@@ -40,8 +40,8 @@ int extent_from_logical(struct btrfs_fs_info *fs_info, u64
logical,
u64 *flags);
int tree_backref_for_extent(unsigned long *ptr, struct extent_buffer *eb,
- struct btrfs_extent_item *ei, u32 item_size,
- u64 *out_root, u8 *out_level);
+ struct btrfs_key *key, struct btrfs_extent_item *ei,
+ u32 item_size, u64 *out_root, u8 *out_level);
int iterate_extent_inodes(struct btrfs_fs_info *fs_info,
u64 extent_item_objectid,
diff --git a/fs/btrfs/scrub.c b/fs/btrfs/scrub.c
index a18e0e23f6a6..0b23100dd8ab 100644
--- a/fs/btrfs/scrub.c
+++ b/fs/btrfs/scrub.c
@@ -553,8 +553,9 @@ static void scrub_print_warning(const char *errstr, struct
scrub_block *sblock)
if (flags & BTRFS_EXTENT_FLAG_TREE_BLOCK) {
do {
- ret = tree_backref_for_extent(&ptr, eb, ei, item_size,
- &ref_root, &ref_level);
+ ret = tree_backref_for_extent(&ptr, eb, &found_key, ei,
+ item_size, &ref_root,
+ &ref_level);
printk_in_rcu(KERN_WARNING
"btrfs: %s at logical %llu on dev %s, "
"sector %llu: metadata %s (level %d) in tree "
--
2.0.0
--
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