From: Su Yanjun <suyj.fnst@xxxxxxxxxxxxxx>
For test case fsck-tests/001-bad-file-extent-bytenr, we have an
obviously hand crafted image with unaligned file extent:
item 7 key (257 EXTENT_DATA 0) itemoff 3453 itemsize 53
generation 6 type 1 (regular)
extent data disk byte 755944791 nr 1048576
extent data offset 0 nr 1048576 ram 1048576
extent compression 0 (none)
disk bytenr 755944791 is obviously unaligned (not even).
For such obviously corrupted file extent, we should just delete the file
extent.
Signed-off-by: Su Yanjun <suyj.fnst@xxxxxxxxxxxxxx>
[Update commit message and comment]
Signed-off-by: Qu Wenruo <wqu@xxxxxxxx>
---
check/main.c | 271 +++++++++++++++++++++++++++++++++++++++++-
check/mode-original.h | 13 ++
ctree.h | 2 +
disk-io.c | 1 +
4 files changed, 285 insertions(+), 2 deletions(-)
diff --git a/check/main.c b/check/main.c
index 6124a22f7cc9..951a23b1e26a 100644
--- a/check/main.c
+++ b/check/main.c
@@ -462,6 +462,8 @@ static struct inode_record *clone_inode_rec(struct inode_record *orig_rec)
struct inode_backref *tmp;
struct mismatch_dir_hash_record *hash_record;
struct mismatch_dir_hash_record *new_record;
+ struct unaligned_extent_rec_t *src;
+ struct unaligned_extent_rec_t *dst;
struct rb_node *rb;
size_t size;
int ret;
@@ -473,6 +475,7 @@ static struct inode_record *clone_inode_rec(struct inode_record *orig_rec)
rec->refs = 1;
INIT_LIST_HEAD(&rec->backrefs);
INIT_LIST_HEAD(&rec->mismatch_dir_hash);
+ INIT_LIST_HEAD(&rec->unaligned_extent_recs);
rec->holes = RB_ROOT;
list_for_each_entry(orig, &orig_rec->backrefs, list) {
@@ -495,6 +498,17 @@ static struct inode_record *clone_inode_rec(struct inode_record *orig_rec)
memcpy(&new_record, hash_record, size);
list_add_tail(&new_record->list, &rec->mismatch_dir_hash);
}
+ list_for_each_entry(src, &orig_rec->unaligned_extent_recs, list) {
+ size = sizeof(*src);
+ dst = malloc(size);
+ if (!dst) {
+ ret = -ENOMEM;
+ goto cleanup;
+ }
+ memcpy(dst, src, size);
+ list_add_tail(&dst->list, &rec->unaligned_extent_recs);
+ }
+
ret = copy_file_extent_holes(&rec->holes, &orig_rec->holes);
if (ret < 0)
goto cleanup_rb;
@@ -525,6 +539,12 @@ cleanup:
free(hash_record);
}
}
+ if (!list_empty(&rec->unaligned_extent_recs))
+ list_for_each_entry_safe(src, dst, &rec->unaligned_extent_recs,
+ list) {
+ list_del(&src->list);
+ free(src);
+ }
free(rec);
@@ -683,6 +703,7 @@ static struct inode_record *get_inode_rec(struct cache_tree *inode_cache,
rec->refs = 1;
INIT_LIST_HEAD(&rec->backrefs);
INIT_LIST_HEAD(&rec->mismatch_dir_hash);
+ INIT_LIST_HEAD(&rec->unaligned_extent_recs);
rec->holes = RB_ROOT;
node = malloc(sizeof(*node));
@@ -704,6 +725,18 @@ static struct inode_record *get_inode_rec(struct cache_tree *inode_cache,
return rec;
}
+static void free_unaligned_extent_recs(struct list_head *unaligned_extent_recs)
+{
+ struct unaligned_extent_rec_t *urec;
+
+ while (!list_empty(unaligned_extent_recs)) {
+ urec = list_entry(unaligned_extent_recs->next,
+ struct unaligned_extent_rec_t, list);
+ list_del(&urec->list);
+ free(urec);
+ }
+}
+
static void free_inode_rec(struct inode_record *rec)
{
struct inode_backref *backref;
@@ -720,6 +753,7 @@ static void free_inode_rec(struct inode_record *rec)
}
list_for_each_entry_safe(hash, next, &rec->mismatch_dir_hash, list)
free(hash);
+ free_unaligned_extent_recs(&rec->unaligned_extent_recs);
free_file_extent_holes(&rec->holes);
free(rec);
}
@@ -2577,12 +2611,145 @@ static int repair_mismatch_dir_hash(struct btrfs_trans_handle *trans,
return ret;
}
+static int btrfs_delete_item(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root, struct btrfs_key *key)
+{
+ struct btrfs_path path;
+ int ret = 0;
+
+ btrfs_init_path(&path);
+
+ ret = btrfs_search_slot(trans, root, key, &path, -1, 1);
+ if (ret) {
+ if (ret > 0)
+ ret = -ENOENT;
+
+ btrfs_release_path(&path);
+ return ret;
+ }
+
+ ret = btrfs_del_item(trans, root, &path);
+
+ btrfs_release_path(&path);
+ return ret;
+}
+
+static int find_file_extent_offset_by_bytenr(struct btrfs_root *root,
+ u64 owner, u64 bytenr, u64 *offset_ret)
+{
+ int ret = 0;
+ struct btrfs_path path;
+ struct btrfs_key key;
+ struct btrfs_key found_key;
+ struct btrfs_file_extent_item *fi;
+ struct extent_buffer *leaf;
+ u64 disk_bytenr;
+ int slot;
+
+ btrfs_init_path(&path);
+
+ key.objectid = owner;
+ key.type = BTRFS_INODE_ITEM_KEY;
+ key.offset = 0;
+
+ ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+ if (ret) {
+ if (ret > 0)
+ ret = -ENOENT;
+ btrfs_release_path(&path);
+ return ret;
+ }
+
+ btrfs_release_path(&path);
+
+ key.objectid = owner;
+ key.type = BTRFS_EXTENT_DATA_KEY;
+ key.offset = 0;
+
+ ret = btrfs_search_slot(NULL, root, &key, &path, 0, 0);
+ if (ret < 0) {
+ btrfs_release_path(&path);
+ return ret;
+ }
+
+ while (1) {
+ leaf = path.nodes[0];
+ slot = path.slots[0];
+
+ if (slot >= btrfs_header_nritems(leaf)) {
+ ret = btrfs_next_leaf(root, &path);
+ if (ret) {
+ if (ret > 0)
+ ret = 0;
+ break;
+ }
+
+ leaf = path.nodes[0];
+ slot = path.slots[0];
+ }
+
+ btrfs_item_key_to_cpu(leaf, &found_key, slot);
+ if ((found_key.objectid != owner) ||
+ (found_key.type != BTRFS_EXTENT_DATA_KEY))
+ break;
+
+ fi = btrfs_item_ptr(leaf, slot,
+ struct btrfs_file_extent_item);
+
+ disk_bytenr = btrfs_file_extent_disk_bytenr(leaf, fi);
+ if (disk_bytenr == bytenr) {
+ *offset_ret = found_key.offset;
+ ret = 0;
+ break;
+ }
+ path.slots[0]++;
+ }
+
+ btrfs_release_path(&path);
+ return ret;
+}
+
+static int repair_unaligned_extent_recs(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct btrfs_path *path,
+ struct inode_record *rec)
+{
+ int ret = 0;
+ struct btrfs_key key;
+ struct unaligned_extent_rec_t *urec;
+ struct unaligned_extent_rec_t *tmp;
+
+ list_for_each_entry_safe(urec, tmp, &rec->unaligned_extent_recs, list) {
+
+ key.objectid = urec->owner;
+ key.type = BTRFS_EXTENT_DATA_KEY;
+ key.offset = urec->offset;
+ fprintf(stderr, "delete file extent item [%llu,%llu]\n",
+ urec->owner, urec->offset);
+ ret = btrfs_delete_item(trans, root, &key);
+ if (ret)
+ return ret;
+
+ list_del(&urec->list);
+ free(urec);
+ }
+ rec->errors &= ~I_ERR_UNALIGNED_EXTENT_REC;
+
+ return ret;
+}
+
static int try_repair_inode(struct btrfs_root *root, struct inode_record *rec)
{
struct btrfs_trans_handle *trans;
struct btrfs_path path;
int ret = 0;
+ /* unaligned extent recs always lead to csum missing error, clean it */
+ if ((rec->errors & I_ERR_SOME_CSUM_MISSING) &&
+ (rec->errors & I_ERR_UNALIGNED_EXTENT_REC))
+ rec->errors &= ~I_ERR_SOME_CSUM_MISSING;
+
+
if (!(rec->errors & (I_ERR_DIR_ISIZE_WRONG |
I_ERR_NO_ORPHAN_ITEM |
I_ERR_LINK_COUNT_WRONG |
@@ -2590,7 +2757,8 @@ static int try_repair_inode(struct btrfs_root *root, struct inode_record *rec)
I_ERR_FILE_EXTENT_DISCOUNT |
I_ERR_FILE_NBYTES_WRONG |
I_ERR_INLINE_RAM_BYTES_WRONG |
- I_ERR_MISMATCH_DIR_HASH)))
+ I_ERR_MISMATCH_DIR_HASH |
+ I_ERR_UNALIGNED_EXTENT_REC)))
return rec->errors;
/*
@@ -2621,6 +2789,8 @@ static int try_repair_inode(struct btrfs_root *root, struct inode_record *rec)
ret = repair_inode_nbytes(trans, root, &path, rec);
if (!ret && rec->errors & I_ERR_INLINE_RAM_BYTES_WRONG)
ret = repair_inline_ram_bytes(trans, root, &path, rec);
+ if (!ret && rec->errors & I_ERR_UNALIGNED_EXTENT_REC)
+ ret = repair_unaligned_extent_recs(trans, root, &path, rec);
btrfs_commit_transaction(trans, root);
btrfs_release_path(&path);
return ret;
@@ -3239,6 +3409,8 @@ static int check_fs_root(struct btrfs_root *root,
struct cache_tree corrupt_blocks;
enum btrfs_tree_block_status status;
struct node_refs nrefs;
+ struct unaligned_extent_rec_t *urec;
+ struct unaligned_extent_rec_t *tmp;
/*
* Reuse the corrupt_block cache tree to record corrupted tree block
@@ -3262,6 +3434,28 @@ static int check_fs_root(struct btrfs_root *root,
cache_tree_init(&root_node.inode_cache);
memset(&nrefs, 0, sizeof(nrefs));
+ /* Mode unaligned extent recs to corresponding inode record */
+ list_for_each_entry_safe(urec, tmp,
+ &root->unaligned_extent_recs, list) {
+ struct inode_record *inode;
+
+ inode = get_inode_rec(&root_node.inode_cache, urec->owner, 1);
+
+ if (IS_ERR_OR_NULL(inode)) {
+ fprintf(stderr,
+ "fail to get inode rec on [%llu,%llu]\n",
+ urec->objectid, urec->owner);
+
+ list_del(&urec->list);
+ free(urec);
+
+ continue;
+ }
+
+ inode->errors |= I_ERR_UNALIGNED_EXTENT_REC;
+ list_move(&urec->list, &inode->unaligned_extent_recs);
+ }
+
level = btrfs_header_level(root->node);
memset(wc->nodes, 0, sizeof(wc->nodes));
wc->nodes[level] = &root_node;
@@ -7542,6 +7736,66 @@ static int prune_corrupt_blocks(struct btrfs_fs_info *info)
return 0;
}
+static int record_unaligned_extent_rec(struct btrfs_fs_info *fs_info,
+ struct extent_record *rec)
+{
+
+ struct extent_backref *back, *tmp;
+ struct data_backref *dback;
+ struct btrfs_root *dest_root;
+ struct btrfs_key key;
+ struct unaligned_extent_rec_t *urec;
+ LIST_HEAD(entries);
+ int ret = 0;
+
+ fprintf(stderr, "record unaligned extent record on %llu %llu\n",
+ rec->start, rec->nr);
+
+ /*
+ * Metadata is easy and the backrefs should always agree on bytenr and
+ * size, if not we've got bigger issues.
+ */
+ if (rec->metadata)
+ return 0;
+
+ rbtree_postorder_for_each_entry_safe(back, tmp,
+ &rec->backref_tree, node) {
+ if (back->full_backref || !back->is_data)
+ continue;
+
+ dback = to_data_backref(back);
+
+ key.objectid = dback->root;
+ key.type = BTRFS_ROOT_ITEM_KEY;
+ key.offset = (u64)-1;
+
+ dest_root = btrfs_read_fs_root(fs_info, &key);
+
+ /* For non-exist root we just skip it */
+ if (IS_ERR_OR_NULL(dest_root))
+ continue;
+
+ urec = malloc(sizeof(struct unaligned_extent_rec_t));
+ if (!urec)
+ return -ENOMEM;
+
+ INIT_LIST_HEAD(&urec->list);
+ urec->objectid = dest_root->objectid;
+ urec->owner = dback->owner;
+ urec->offset = 0;
+ urec->bytenr = rec->start;
+ ret = find_file_extent_offset_by_bytenr(dest_root,
+ dback->owner, rec->start, &urec->offset);
+ if (ret) {
+ free(urec);
+ return ret;
+ }
+ list_add(&urec->list, &dest_root->unaligned_extent_recs);
+ }
+
+ return ret;
+}
+
static int check_extent_refs(struct btrfs_root *root,
struct cache_tree *extent_cache)
{
@@ -7639,6 +7893,19 @@ static int check_extent_refs(struct btrfs_root *root,
fix = 1;
cur_err = 1;
}
+
+ if (!IS_ALIGNED(rec->start, root->fs_info->sectorsize)) {
+ fprintf(stderr, "unaligned extent rec on [%llu %llu]\n",
+ (unsigned long long)rec->start,
+ (unsigned long long)rec->nr);
+ ret = record_unaligned_extent_rec(root->fs_info, rec);
+ if (ret)
+ goto repair_abort;
+
+ /* No need to check backref */
+ goto next;
+ }
+
if (all_backpointers_checked(rec, 1)) {
fprintf(stderr, "backpointer mismatch on [%llu %llu]\n",
(unsigned long long)rec->start,
@@ -7691,7 +7958,7 @@ static int check_extent_refs(struct btrfs_root *root,
rec->start, rec->start + rec->max_size);
cur_err = 1;
}
-
+next:
err = cur_err;
remove_cache_extent(extent_cache, cache);
free_all_extent_backrefs(rec);
diff --git a/check/mode-original.h b/check/mode-original.h
index 5f9187dc1089..da2b6d811652 100644
--- a/check/mode-original.h
+++ b/check/mode-original.h
@@ -155,6 +155,16 @@ struct file_extent_hole {
u64 len;
};
+struct unaligned_extent_rec_t {
+ struct list_head list;
+
+ u64 objectid;
+ u64 owner;
+ u64 offset;
+
+ u64 bytenr;
+};
+
#define I_ERR_NO_INODE_ITEM (1 << 0)
#define I_ERR_NO_ORPHAN_ITEM (1 << 1)
#define I_ERR_DUP_INODE_ITEM (1 << 2)
@@ -169,6 +179,7 @@ struct file_extent_hole {
#define I_ERR_ODD_CSUM_ITEM (1 << 11)
#define I_ERR_SOME_CSUM_MISSING (1 << 12)
#define I_ERR_LINK_COUNT_WRONG (1 << 13)
+#define I_ERR_UNALIGNED_EXTENT_REC (1 << 14)
#define I_ERR_FILE_EXTENT_TOO_LARGE (1 << 15)
#define I_ERR_ODD_INODE_FLAGS (1 << 16)
#define I_ERR_INLINE_RAM_BYTES_WRONG (1 << 17)
@@ -186,6 +197,8 @@ struct inode_record {
unsigned int nodatasum:1;
int errors;
+ struct list_head unaligned_extent_recs;
+
u64 ino;
u32 nlink;
u32 imode;
diff --git a/ctree.h b/ctree.h
index ff0bacbc127d..35c52dad8c40 100644
--- a/ctree.h
+++ b/ctree.h
@@ -1191,6 +1191,8 @@ struct btrfs_root {
u32 type;
u64 last_inode_alloc;
+ struct list_head unaligned_extent_recs;
+
/* the dirty list is only used by non-reference counted roots */
struct list_head dirty_list;
struct rb_node rb_node;
diff --git a/disk-io.c b/disk-io.c
index 5874685bb8db..a9d58e6c1357 100644
--- a/disk-io.c
+++ b/disk-io.c
@@ -495,6 +495,7 @@ void btrfs_setup_root(struct btrfs_root *root, struct btrfs_fs_info *fs_info,
root->last_inode_alloc = 0;
INIT_LIST_HEAD(&root->dirty_list);
+ INIT_LIST_HEAD(&root->unaligned_extent_recs);
memset(&root->root_key, 0, sizeof(root->root_key));
memset(&root->root_item, 0, sizeof(root->root_item));
root->root_key.objectid = objectid;
--
2.21.0
