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btrfs-progs: check: original, detect and repair ram_bytes mismatch 

For non-compressed non-hole file extent items, the ram_bytes should
match disk_num_bytes.

But due to kernel bugs, we have several cases where ram_bytes is not
correctly updated.

Thankfully this is really a very minor mismatch and can never cause data
corruption since the kernel does not utilize ram_bytes for
non-compressed extents at all.

So here we just detect and repair it for original mode.

Signed-off-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Qu Wenruo 2024-05-02 18:37:54 +09:30 committed by David Sterba
parent 97bf7a5969
commit 7313573c19
2 changed files with 130 additions and 4 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

126
check/main.c
View File

@ -493,6 +493,33 @@ static int device_record_compare(const struct rb_node *node1, const struct rb_no
return 0;
}
static int add_mismatch_ram_bytes_record(struct inode_record *inode_rec,
struct btrfs_key *key)
{
struct mismatch_ram_bytes_record *record;
record = malloc(sizeof(*record));
if (!record) {
error_msg(ERROR_MSG_MEMORY, "mismatch ram bytes record");
return -ENOMEM;
}
memcpy(&record->key, key, sizeof(*key));
list_add_tail(&record->list, &inode_rec->mismatch_ram_bytes);
return 0;
}
static void free_mismatch_ram_bytes_records(struct inode_record *inode_rec)
{
if (!list_empty(&inode_rec->mismatch_ram_bytes)) {
struct mismatch_ram_bytes_record *ram;
ram = list_entry(inode_rec->mismatch_ram_bytes.next,
struct mismatch_ram_bytes_record, list);
list_del(&ram->list);
free(ram);
}
}
static struct inode_record *clone_inode_rec(struct inode_record *orig_rec)
{
struct inode_record *rec;
@ -501,6 +528,7 @@ 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 mismatch_ram_bytes_record *ram_record;
struct unaligned_extent_rec_t *src;
struct unaligned_extent_rec_t *dst;
struct rb_node *rb;
@ -514,6 +542,7 @@ 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->mismatch_ram_bytes);
INIT_LIST_HEAD(&rec->unaligned_extent_recs);
rec->holes = RB_ROOT;
@ -537,6 +566,11 @@ 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(ram_record, &orig_rec->mismatch_ram_bytes, list) {
ret = add_mismatch_ram_bytes_record(rec, &ram_record->key);
if (ret < 0)
goto cleanup;
}
list_for_each_entry(src, &orig_rec->unaligned_extent_recs, list) {
size = sizeof(*src);
dst = malloc(size);
@ -578,6 +612,7 @@ cleanup:
free(hash_record);
}
}
free_mismatch_ram_bytes_records(rec);
if (!list_empty(&rec->unaligned_extent_recs))
list_for_each_entry_safe(src, dst, &rec->unaligned_extent_recs,
list) {
@ -619,6 +654,8 @@ static void print_inode_error(struct btrfs_root *root, struct inode_record *rec)
fprintf(stderr, ", odd file extent");
if (errors & I_ERR_BAD_FILE_EXTENT)
fprintf(stderr, ", bad file extent");
if (errors & I_ERR_RAM_BYTES_MISMATCH)
fprintf(stderr, ", bad ram bytes for non-compressed extents");
if (errors & I_ERR_FILE_EXTENT_OVERLAP)
fprintf(stderr, ", file extent overlap");
if (errors & I_ERR_FILE_EXTENT_TOO_LARGE)
@ -637,8 +674,6 @@ static void print_inode_error(struct btrfs_root *root, struct inode_record *rec)
fprintf(stderr, ", link count wrong");
if (errors & I_ERR_ODD_INODE_FLAGS)
fprintf(stderr, ", odd inode flags");
if (errors & I_ERR_INLINE_RAM_BYTES_WRONG)
fprintf(stderr, ", invalid inline ram bytes");
if (errors & I_ERR_INVALID_IMODE)
fprintf(stderr, ", invalid inode mode bit 0%o",
rec->imode & ~07777);
@ -699,6 +734,17 @@ static void print_inode_error(struct btrfs_root *root, struct inode_record *rec)
hash_record->key.offset);
}
}
if (errors & I_ERR_RAM_BYTES_MISMATCH) {
struct mismatch_ram_bytes_record *ram_record;
fprintf(stderr,
"Non-compressed file extents with invalid ram_bytes (minor errors):\n");
list_for_each_entry(ram_record, &rec->mismatch_ram_bytes, list) {
fprintf(stderr, "\tino=%llu offset=%llu\n",
ram_record->key.objectid,
ram_record->key.offset);
}
}
}
static void print_ref_error(int errors)
@ -760,6 +806,7 @@ 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->mismatch_ram_bytes);
INIT_LIST_HEAD(&rec->unaligned_extent_recs);
rec->holes = RB_ROOT;
@ -811,6 +858,14 @@ static void free_inode_rec(struct inode_record *rec)
list_del(&backref->list);
free(backref);
}
while (!list_empty(&rec->mismatch_ram_bytes)) {
struct mismatch_ram_bytes_record *ram;
ram = list_entry(rec->mismatch_ram_bytes.next,
struct mismatch_ram_bytes_record, list);
list_del(&ram->list);
free(ram);
}
list_for_each_entry_safe(hash, next, &rec->mismatch_dir_hash, list)
free(hash);
free_unaligned_extent_recs(&rec->unaligned_extent_recs);
@ -821,7 +876,8 @@ static void free_inode_rec(struct inode_record *rec)
static bool can_free_inode_rec(struct inode_record *rec)
{
if (!rec->errors && rec->checked && rec->found_inode_item &&
rec->nlink == rec->found_link && list_empty(&rec->backrefs))
rec->nlink == rec->found_link && list_empty(&rec->backrefs) &&
list_empty(&rec->mismatch_ram_bytes))
return true;
return false;
}
@ -1742,6 +1798,14 @@ static int process_file_extent(struct btrfs_root *root,
rec->errors |= I_ERR_BAD_FILE_EXTENT;
if (compression && rec->nodatasum)
rec->errors |= I_ERR_BAD_FILE_EXTENT;
if (disk_bytenr && !compression &&
btrfs_file_extent_ram_bytes(eb, fi) !=
btrfs_file_extent_disk_num_bytes(eb, fi)) {
rec->errors |= I_ERR_RAM_BYTES_MISMATCH;
ret = add_mismatch_ram_bytes_record(rec, key);
if (ret < 0)
return ret;
}
if (disk_bytenr > 0)
rec->found_size += num_bytes;
} else {
@ -3012,6 +3076,57 @@ static int repair_inode_gen_original(struct btrfs_trans_handle *trans,
return 0;
}
static int repair_ram_bytes(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct btrfs_path *path,
struct inode_record *rec)
{
struct mismatch_ram_bytes_record *record;
struct mismatch_ram_bytes_record *tmp;
int ret = 0;
btrfs_release_path(path);
list_for_each_entry_safe(record, tmp, &rec->mismatch_ram_bytes, list) {
struct btrfs_file_extent_item *fi;
struct extent_buffer *leaf;
int type;
int slot;
int search_ret;
search_ret = btrfs_search_slot(trans, root, &record->key, path, 0, 1);
if (search_ret > 0)
search_ret = -ENOENT;
if (search_ret < 0) {
ret = search_ret;
btrfs_release_path(path);
continue;
}
leaf = path->nodes[0];
slot = path->slots[0];
fi = btrfs_item_ptr(leaf, slot, struct btrfs_file_extent_item);
type = btrfs_file_extent_type(leaf, fi);
if (type != BTRFS_FILE_EXTENT_REG &&
type != BTRFS_FILE_EXTENT_PREALLOC) {
ret = -EUCLEAN;
btrfs_release_path(path);
continue;
}
if (btrfs_file_extent_disk_bytenr(path->nodes[0], fi) == 0 ||
btrfs_file_extent_compression(path->nodes[0], fi)) {
ret = -EUCLEAN;
btrfs_release_path(path);
continue;
}
btrfs_set_file_extent_ram_bytes(leaf, fi,
btrfs_file_extent_disk_num_bytes(leaf, fi));
btrfs_mark_buffer_dirty(leaf);
btrfs_release_path(path);
}
if (!ret)
rec->errors &= ~I_ERR_RAM_BYTES_MISMATCH;
return ret;
}
static int try_repair_inode(struct btrfs_root *root, struct inode_record *rec)
{
struct btrfs_trans_handle *trans;
@ -3034,7 +3149,8 @@ static int try_repair_inode(struct btrfs_root *root, struct inode_record *rec)
I_ERR_MISMATCH_DIR_HASH |
I_ERR_UNALIGNED_EXTENT_REC |
I_ERR_INVALID_IMODE |
I_ERR_INVALID_GEN)))
I_ERR_INVALID_GEN |
I_ERR_RAM_BYTES_MISMATCH)))
return rec->errors;
/*
@ -3074,6 +3190,8 @@ static int try_repair_inode(struct btrfs_root *root, struct inode_record *rec)
ret = repair_unaligned_extent_recs(trans, root, &path, rec);
if (!ret && rec->errors & I_ERR_INVALID_GEN)
ret = repair_inode_gen_original(trans, root, &path, rec);
if (!ret && rec->errors & I_ERR_RAM_BYTES_MISMATCH)
ret = repair_ram_bytes(trans, root, &path, rec);
btrfs_commit_transaction(trans, root);
btrfs_release_path(&path);
return ret;

8
check/mode-original.h
View File

@ -189,6 +189,8 @@ struct unaligned_extent_rec_t {
#define I_ERR_INVALID_GEN (1U << 20)
#define I_ERR_INVALID_NLINK (1U << 21)
#define I_ERR_INVALID_XATTR (1U << 22)
/* Ram_bytes mismatch for non-compressed data extents. */
#define I_ERR_RAM_BYTES_MISMATCH (1U << 23)
struct inode_record {
struct list_head backrefs;
@ -216,6 +218,7 @@ struct inode_record {
u64 extent_end;
struct rb_root holes;
struct list_head mismatch_dir_hash;
struct list_head mismatch_ram_bytes;
u32 refs;
};
@ -232,6 +235,11 @@ struct mismatch_dir_hash_record {
/* namebuf follows here */
};
struct mismatch_ram_bytes_record {
struct list_head list;
struct btrfs_key key;
};
struct root_backref {
struct list_head list;
unsigned int found_dir_item:1;