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btrfs: Add graceful handling of V0 extents

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Following the removal of the v0 handling code let's be courteous and
print an error message when such extents are handled. In the cases
where we have a transaction just abort it, otherwise just call
btrfs_handle_fs_error. Both cases result in the FS being re-mounted RO.

In case the error handling would be too intrusive, leave the BUG_ON in
place, like extent_data_ref_count, other proper handling would catch
that earlier.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2018-06-26 16:57:36 +03:00 committed by David Sterba
parent a79865c680
commit ba3c2b196b
4 changed files with 72 additions and 10 deletions
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7
fs/btrfs/ctree.h
View File

@ -3432,6 +3432,13 @@ static inline void assfail(char *expr, char *file, int line)
#define ASSERT(expr) ((void)0)
#endif
__cold
static inline void btrfs_print_v0_err(struct btrfs_fs_info *fs_info)
{
btrfs_err(fs_info,
"Unsupported V0 extent filesystem detected. Aborting. Please re-create your filesystem with a newer kernel");
}
__printf(5, 6)
__cold
void __btrfs_handle_fs_error(struct btrfs_fs_info *fs_info, const char *function,

39
fs/btrfs/extent-tree.c
View File

@ -867,8 +867,16 @@ int btrfs_lookup_extent_info(struct btrfs_trans_handle *trans,
num_refs = btrfs_extent_refs(leaf, ei);
extent_flags = btrfs_extent_flags(leaf, ei);
} else {
BUG();
ret = -EINVAL;
btrfs_print_v0_err(fs_info);
if (trans)
btrfs_abort_transaction(trans, ret);
else
btrfs_handle_fs_error(fs_info, ret, NULL);
goto out_free;
}
BUG_ON(num_refs == 0);
} else {
num_refs = 0;
@ -1296,6 +1304,10 @@ static noinline int remove_extent_data_ref(struct btrfs_trans_handle *trans,
ref2 = btrfs_item_ptr(leaf, path->slots[0],
struct btrfs_shared_data_ref);
num_refs = btrfs_shared_data_ref_count(leaf, ref2);
} else if (key.type == BTRFS_EXTENT_REF_V0_KEY) {
btrfs_print_v0_err(trans->fs_info);
btrfs_abort_transaction(trans, -EINVAL);
return -EINVAL;
} else {
BUG();
}
@ -1328,6 +1340,8 @@ static noinline u32 extent_data_ref_count(struct btrfs_path *path,
leaf = path->nodes[0];
btrfs_item_key_to_cpu(leaf, &key, path->slots[0]);
BUG_ON(key.type == BTRFS_EXTENT_REF_V0_KEY);
if (iref) {
/*
* If type is invalid, we should have bailed out earlier than
@ -1541,7 +1555,12 @@ int lookup_inline_extent_backref(struct btrfs_trans_handle *trans,
leaf = path->nodes[0];
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
BUG_ON(item_size < sizeof(*ei));
if (item_size < sizeof(*ei)) {
err = -EINVAL;
btrfs_print_v0_err(fs_info);
btrfs_abort_transaction(trans, err);
goto out;
}
ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
flags = btrfs_extent_flags(leaf, ei);
@ -2265,7 +2284,14 @@ static int run_delayed_extent_op(struct btrfs_trans_handle *trans,
leaf = path->nodes[0];
item_size = btrfs_item_size_nr(leaf, path->slots[0]);
BUG_ON(item_size < sizeof(*ei));
if (item_size < sizeof(*ei)) {
err = -EINVAL;
btrfs_print_v0_err(fs_info);
btrfs_abort_transaction(trans, err);
goto out;
}
ei = btrfs_item_ptr(leaf, path->slots[0], struct btrfs_extent_item);
__run_delayed_extent_op(extent_op, leaf, ei);
@ -6796,7 +6822,12 @@ static int __btrfs_free_extent(struct btrfs_trans_handle *trans,
leaf = path->nodes[0];
item_size = btrfs_item_size_nr(leaf, extent_slot);
BUG_ON(item_size < sizeof(*ei));
if (item_size < sizeof(*ei)) {
ret = -EINVAL;
btrfs_print_v0_err(info);
btrfs_abort_transaction(trans, ret);
goto out;
}
ei = btrfs_item_ptr(leaf, extent_slot,
struct btrfs_extent_item);
if (owner_objectid < BTRFS_FIRST_FREE_OBJECTID &&

9
fs/btrfs/print-tree.c
View File

@ -52,8 +52,10 @@ static void print_extent_item(struct extent_buffer *eb, int slot, int type)
u64 offset;
int ref_index = 0;
if (item_size < sizeof(*ei))
BUG();
if (item_size < sizeof(*ei)) {
btrfs_print_v0_err(eb->fs_info);
btrfs_handle_fs_error(eb->fs_info, -EINVAL, NULL);
}
ei = btrfs_item_ptr(eb, slot, struct btrfs_extent_item);
flags = btrfs_extent_flags(eb, ei);
@ -256,7 +258,8 @@ void btrfs_print_leaf(struct extent_buffer *l)
btrfs_file_extent_ram_bytes(l, fi));
break;
case BTRFS_EXTENT_REF_V0_KEY:
BUG();
btrfs_print_v0_err(fs_info);
btrfs_handle_fs_error(fs_info, -EINVAL, NULL);
break;
case BTRFS_BLOCK_GROUP_ITEM_KEY:
bi = btrfs_item_ptr(l, i,

27
fs/btrfs/relocation.c
View File

@ -598,6 +598,11 @@ int find_inline_backref(struct extent_buffer *leaf, int slot,
btrfs_item_key_to_cpu(leaf, &key, slot);
item_size = btrfs_item_size_nr(leaf, slot);
if (item_size < sizeof(*ei)) {
btrfs_print_v0_err(leaf->fs_info);
btrfs_handle_fs_error(leaf->fs_info, -EINVAL, NULL);
return 1;
}
ei = btrfs_item_ptr(leaf, slot, struct btrfs_extent_item);
WARN_ON(!(btrfs_extent_flags(leaf, ei) &
BTRFS_EXTENT_FLAG_TREE_BLOCK));
@ -782,7 +787,6 @@ struct backref_node *build_backref_tree(struct reloc_control *rc,
goto next;
}
ASSERT(key.type != BTRFS_EXTENT_REF_V0_KEY);
if (key.type == BTRFS_SHARED_BLOCK_REF_KEY) {
if (key.objectid == key.offset) {
/*
@ -826,6 +830,12 @@ struct backref_node *build_backref_tree(struct reloc_control *rc,
edge->node[UPPER] = upper;
goto next;
} else if (key.type == BTRFS_EXTENT_REF_V0_KEY) {
err = -EINVAL;
btrfs_print_v0_err(rc->extent_root->fs_info);
btrfs_handle_fs_error(rc->extent_root->fs_info, err,
NULL);
goto out;
} else if (key.type != BTRFS_TREE_BLOCK_REF_KEY) {
goto next;
}
@ -3315,6 +3325,10 @@ static int add_tree_block(struct reloc_control *rc,
level = (int)extent_key->offset;
}
generation = btrfs_extent_generation(eb, ei);
} else if (item_size == sizeof(struct btrfs_extent_item_v0)) {
btrfs_print_v0_err(eb->fs_info);
btrfs_handle_fs_error(eb->fs_info, -EINVAL, NULL);
return -EINVAL;
} else {
BUG();
}
@ -3720,7 +3734,6 @@ int add_data_references(struct reloc_control *rc,
if (key.objectid != extent_key->objectid)
break;
BUG_ON(key.type == BTRFS_EXTENT_REF_V0_KEY);
if (key.type == BTRFS_SHARED_DATA_REF_KEY) {
ret = __add_tree_block(rc, key.offset, blocksize,
blocks);
@ -3729,6 +3742,10 @@ int add_data_references(struct reloc_control *rc,
struct btrfs_extent_data_ref);
ret = find_data_references(rc, extent_key,
eb, dref, blocks);
} else if (key.type == BTRFS_EXTENT_REF_V0_KEY) {
btrfs_print_v0_err(eb->fs_info);
btrfs_handle_fs_error(eb->fs_info, -EINVAL, NULL);
ret = -EINVAL;
} else {
ret = 0;
}
@ -3967,7 +3984,11 @@ static noinline_for_stack int relocate_block_group(struct reloc_control *rc)
flags = btrfs_extent_flags(path->nodes[0], ei);
ret = check_extent_flags(flags);
BUG_ON(ret);
} else if (item_size == sizeof(struct btrfs_extent_item_v0)) {
err = -EINVAL;
btrfs_print_v0_err(trans->fs_info);
btrfs_abort_transaction(trans, err);
break;
} else {
BUG();
}