// SPDX-License-Identifier: GPL-2.0
#include "bcachefs.h"
#include "bkey_buf.h"
#include "btree_cache.h"
#include "btree_update.h"
#include "buckets.h"
#include "darray.h"
#include "dirent.h"
#include "error.h"
#include "fs.h"
#include "fs-common.h"
#include "fsck.h"
#include "inode.h"
#include "keylist.h"
#include "recovery_passes.h"
#include "snapshot.h"
#include "super.h"
#include "xattr.h"
#include <linux/bsearch.h>
#include <linux/dcache.h> /* struct qstr */
static bool inode_points_to_dirent(struct bch_inode_unpacked *inode,
struct bkey_s_c_dirent d)
{
return inode->bi_dir == d.k->p.inode &&
inode->bi_dir_offset == d.k->p.offset;
}
static bool dirent_points_to_inode_nowarn(struct bkey_s_c_dirent d,
struct bch_inode_unpacked *inode)
{
if (d.v->d_type == DT_SUBVOL
? le32_to_cpu(d.v->d_child_subvol) == inode->bi_subvol
: le64_to_cpu(d.v->d_inum) == inode->bi_inum)
return 0;
return -BCH_ERR_ENOENT_dirent_doesnt_match_inode;
}
static void dirent_inode_mismatch_msg(struct printbuf *out,
struct bch_fs *c,
struct bkey_s_c_dirent dirent,
struct bch_inode_unpacked *inode)
{
prt_str(out, "inode points to dirent that does not point back:");
prt_newline(out);
bch2_bkey_val_to_text(out, c, dirent.s_c);
prt_newline(out);
bch2_inode_unpacked_to_text(out, inode);
}
static int dirent_points_to_inode(struct bch_fs *c,
struct bkey_s_c_dirent dirent,
struct bch_inode_unpacked *inode)
{
int ret = dirent_points_to_inode_nowarn(dirent, inode);
if (ret) {
struct printbuf buf = PRINTBUF;
dirent_inode_mismatch_msg(&buf, c, dirent, inode);
bch_warn(c, "%s", buf.buf);
printbuf_exit(&buf);
}
return ret;
}
/*
* XXX: this is handling transaction restarts without returning
* -BCH_ERR_transaction_restart_nested, this is not how we do things anymore:
*/
static s64 bch2_count_inode_sectors(struct btree_trans *trans, u64 inum,
u32 snapshot)
{
u64 sectors = 0;
int ret = for_each_btree_key_upto(trans, iter, BTREE_ID_extents,
SPOS(inum, 0, snapshot),
POS(inum, U64_MAX),
0, k, ({
if (bkey_extent_is_allocation(k.k))
sectors += k.k->size;
0;
}));
return ret ?: sectors;
}
static s64 bch2_count_subdirs(struct btree_trans *trans, u64 inum,
u32 snapshot)
{
u64 subdirs = 0;
int ret = for_each_btree_key_upto(trans, iter, BTREE_ID_dirents,
SPOS(inum, 0, snapshot),
POS(inum, U64_MAX),
0, k, ({
if (k.k->type == KEY_TYPE_dirent &&
bkey_s_c_to_dirent(k).v->d_type == DT_DIR)
subdirs++;
0;
}));
return ret ?: subdirs;
}
static int subvol_lookup(struct btree_trans *trans, u32 subvol,
u32 *snapshot, u64 *inum)
{
struct bch_subvolume s;
int ret = bch2_subvolume_get(trans, subvol, false, 0, &s);
*snapshot = le32_to_cpu(s.snapshot);
*inum = le64_to_cpu(s.inode);
return ret;
}
static int lookup_first_inode(struct btree_trans *trans, u64 inode_nr,
struct bch_inode_unpacked *inode)
{
struct btree_iter iter;
struct bkey_s_c k;
int ret;
for_each_btree_key_norestart(trans, iter, BTREE_ID_inodes, POS(0, inode_nr),
BTREE_ITER_all_snapshots, k, ret) {
if (k.k->p.offset != inode_nr)
break;
if (!bkey_is_inode(k.k))
continue;
ret = bch2_inode_unpack(k, inode);
goto found;
}
ret = -BCH_ERR_ENOENT_inode;
found:
bch_err_msg(trans->c, ret, "fetching inode %llu", inode_nr);
bch2_trans_iter_exit(trans, &iter);
return ret;
}
static int lookup_inode(struct btree_trans *trans, u64 inode_nr,
struct bch_inode_unpacked *inode,
u32 *snapshot)
{
struct btree_iter iter;
struct bkey_s_c k;
int ret;
k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_inodes,
SPOS(0, inode_nr, *snapshot), 0);
ret = bkey_err(k);
if (ret)
goto err;
ret = bkey_is_inode(k.k)
? bch2_inode_unpack(k, inode)
: -BCH_ERR_ENOENT_inode;
if (!ret)
*snapshot = iter.pos.snapshot;
err:
bch2_trans_iter_exit(trans, &iter);
return ret;
}
static int lookup_dirent_in_snapshot(struct btree_trans *trans,
struct bch_hash_info hash_info,
subvol_inum dir, struct qstr *name,
u64 *target, unsigned *type, u32 snapshot)
{
struct btree_iter iter;
struct bkey_s_c k = bch2_hash_lookup_in_snapshot(trans, &iter, bch2_dirent_hash_desc,
&hash_info, dir, name, 0, snapshot);
int ret = bkey_err(k);
if (ret)
return ret;
struct bkey_s_c_dirent d = bkey_s_c_to_dirent(bch2_btree_iter_peek_slot(&iter));
*target = le64_to_cpu(d.v->d_inum);
*type = d.v->d_type;
bch2_trans_iter_exit(trans, &iter);
return 0;
}
static int __remove_dirent(struct btree_trans *trans, struct bpos pos)
{
struct bch_fs *c = trans->c;
struct btree_iter iter;
struct bch_inode_unpacked dir_inode;
struct bch_hash_info dir_hash_info;
int ret;
ret = lookup_first_inode(trans, pos.inode, &dir_inode);
if (ret)
goto err;
dir_hash_info = bch2_hash_info_init(c, &dir_inode);
bch2_trans_iter_init(trans, &iter, BTREE_ID_dirents, pos, BTREE_ITER_intent);
ret = bch2_btree_iter_traverse(&iter) ?:
bch2_hash_delete_at(trans, bch2_dirent_hash_desc,
&dir_hash_info, &iter,
BTREE_UPDATE_internal_snapshot_node);
bch2_trans_iter_exit(trans, &iter);
err:
bch_err_fn(c, ret);
return ret;
}
/* Get lost+found, create if it doesn't exist: */
static int lookup_lostfound(struct btree_trans *trans, u32 snapshot,
struct bch_inode_unpacked *lostfound,
u64 reattaching_inum)
{
struct bch_fs *c = trans->c;
struct qstr lostfound_str = QSTR("lost+found");
u64 inum = 0;
unsigned d_type = 0;
int ret;
struct bch_snapshot_tree st;
ret = bch2_snapshot_tree_lookup(trans,
bch2_snapshot_tree(c, snapshot), &st);
if (ret)
return ret;
subvol_inum root_inum = { .subvol = le32_to_cpu(st.master_subvol) };
struct bch_subvolume subvol;
ret = bch2_subvolume_get(trans, le32_to_cpu(st.master_subvol),
false, 0, &subvol);
bch_err_msg(c, ret, "looking up root subvol %u for snapshot %u",
le32_to_cpu(st.master_subvol), snapshot);
if (ret)
return ret;
if (!subvol.inode) {
struct btree_iter iter;
struct bkey_i_subvolume *subvol = bch2_bkey_get_mut_typed(trans, &iter,
BTREE_ID_subvolumes, POS(0, le32_to_cpu(st.master_subvol)),
0, subvolume);
ret = PTR_ERR_OR_ZERO(subvol);
if (ret)
return ret;
subvol->v.inode = cpu_to_le64(reattaching_inum);
bch2_trans_iter_exit(trans, &iter);
}
root_inum.inum = le64_to_cpu(subvol.inode);
struct bch_inode_unpacked root_inode;
struct bch_hash_info root_hash_info;
u32 root_inode_snapshot = snapshot;
ret = lookup_inode(trans, root_inum.inum, &root_inode, &root_inode_snapshot);
bch_err_msg(c, ret, "looking up root inode %llu for subvol %u",
root_inum.inum, le32_to_cpu(st.master_subvol));
if (ret)
return ret;
root_hash_info = bch2_hash_info_init(c, &root_inode);
ret = lookup_dirent_in_snapshot(trans, root_hash_info, root_inum,
&lostfound_str, &inum, &d_type, snapshot);
if (bch2_err_matches(ret, ENOENT))
goto create_lostfound;
bch_err_fn(c, ret);
if (ret)
return ret;
if (d_type != DT_DIR) {
bch_err(c, "error looking up lost+found: not a directory");
return -BCH_ERR_ENOENT_not_directory;
}
/*
* The bch2_check_dirents pass has already run, dangling dirents
* shouldn't exist here:
*/
ret = lookup_inode(trans, inum, lostfound, &snapshot);
bch_err_msg(c, ret, "looking up lost+found %llu:%u in (root inode %llu, snapshot root %u)",
inum, snapshot, root_inum.inum, bch2_snapshot_root(c, snapshot));
return ret;
create_lostfound:
/*
* XXX: we could have a nicer log message here if we had a nice way to
* walk backpointers to print a path
*/
bch_notice(c, "creating lost+found in snapshot %u", le32_to_cpu(st.root_snapshot));
u64 now = bch2_current_time(c);
struct btree_iter lostfound_iter = { NULL };
u64 cpu = raw_smp_processor_id();
bch2_inode_init_early(c, lostfound);
bch2_inode_init_late(lostfound, now, 0, 0, S_IFDIR|0700, 0, &root_inode);
lostfound->bi_dir = root_inode.bi_inum;
root_inode.bi_nlink++;
ret = bch2_inode_create(trans, &lostfound_iter, lostfound, snapshot, cpu);
if (ret)
goto err;
bch2_btree_iter_set_snapshot(&lostfound_iter, snapshot);
ret = bch2_btree_iter_traverse(&lostfound_iter);
if (ret)
goto err;
ret = bch2_dirent_create_snapshot(trans,
0, root_inode.bi_inum, snapshot, &root_hash_info,
mode_to_type(lostfound->bi_mode),
&lostfound_str,
lostfound->bi_inum,
&lostfound->bi_dir_offset,
STR_HASH_must_create) ?:
bch2_inode_write_flags(trans, &lostfound_iter, lostfound,
BTREE_UPDATE_internal_snapshot_node);
err:
bch_err_msg(c, ret, "creating lost+found");
bch2_trans_iter_exit(trans, &lostfound_iter);
return ret;
}
static int reattach_inode(struct btree_trans *trans,
struct bch_inode_unpacked *inode,
u32 inode_snapshot)
{
struct bch_fs *c = trans->c;
struct bch_hash_info dir_hash;
struct bch_inode_unpacked lostfound;
char name_buf[20];
struct qstr name;
u64 dir_offset = 0;
u32 dirent_snapshot = inode_snapshot;
int ret;
if (inode->bi_subvol) {
inode->bi_parent_subvol = BCACHEFS_ROOT_SUBVOL;
u64 root_inum;
ret = subvol_lookup(trans, inode->bi_parent_subvol,
&dirent_snapshot, &root_inum);
if (ret)
return ret;
snprintf(name_buf, sizeof(name_buf), "subvol-%u", inode->bi_subvol);
} else {
snprintf(name_buf, sizeof(name_buf), "%llu", inode->bi_inum);
}
ret = lookup_lostfound(trans, dirent_snapshot, &lostfound, inode->bi_inum);
if (ret)
return ret;
if (S_ISDIR(inode->bi_mode)) {
lostfound.bi_nlink++;
ret = __bch2_fsck_write_inode(trans, &lostfound, U32_MAX);
if (ret)
return ret;
}
dir_hash = bch2_hash_info_init(c, &lostfound);
name = (struct qstr) QSTR(name_buf);
ret = bch2_dirent_create_snapshot(trans,
inode->bi_parent_subvol, lostfound.bi_inum,
dirent_snapshot,
&dir_hash,
inode_d_type(inode),
&name,
inode->bi_subvol ?: inode->bi_inum,
&dir_offset,
STR_HASH_must_create);
if (ret) {
bch_err_msg(c, ret, "error creating dirent");
return ret;
}
inode->bi_dir = lostfound.bi_inum;
inode->bi_dir_offset = dir_offset;
return __bch2_fsck_write_inode(trans, inode, inode_snapshot);
}
static int remove_backpointer(struct btree_trans *trans,
struct bch_inode_unpacked *inode)
{
if (!inode->bi_dir)
return 0;
struct bch_fs *c = trans->c;
struct btree_iter iter;
struct bkey_s_c_dirent d =
bch2_bkey_get_iter_typed(trans, &iter, BTREE_ID_dirents,
SPOS(inode->bi_dir, inode->bi_dir_offset, inode->bi_snapshot), 0,
dirent);
int ret = bkey_err(d) ?:
dirent_points_to_inode(c, d, inode) ?:
__remove_dirent(trans, d.k->p);
bch2_trans_iter_exit(trans, &iter);
return ret;
}
static int reattach_subvol(struct btree_trans *trans, struct bkey_s_c_subvolume s)
{
struct bch_fs *c = trans->c;
struct bch_inode_unpacked inode;
int ret = bch2_inode_find_by_inum_trans(trans,
(subvol_inum) { s.k->p.offset, le64_to_cpu(s.v->inode) },
&inode);
if (ret)
return ret;
ret = remove_backpointer(trans, &inode);
if (!bch2_err_matches(ret, ENOENT))
bch_err_msg(c, ret, "removing dirent");
if (ret)
return ret;
ret = reattach_inode(trans, &inode, le32_to_cpu(s.v->snapshot));
bch_err_msg(c, ret, "reattaching inode %llu", inode.bi_inum);
return ret;
}
static int reconstruct_subvol(struct btree_trans *trans, u32 snapshotid, u32 subvolid, u64 inum)
{
struct bch_fs *c = trans->c;
if (!bch2_snapshot_is_leaf(c, snapshotid)) {
bch_err(c, "need to reconstruct subvol, but have interior node snapshot");
return -BCH_ERR_fsck_repair_unimplemented;
}
/*
* If inum isn't set, that means we're being called from check_dirents,
* not check_inodes - the root of this subvolume doesn't exist or we
* would have found it there:
*/
if (!inum) {
struct btree_iter inode_iter = {};
struct bch_inode_unpacked new_inode;
u64 cpu = raw_smp_processor_id();
bch2_inode_init_early(c, &new_inode);
bch2_inode_init_late(&new_inode, bch2_current_time(c), 0, 0, S_IFDIR|0755, 0, NULL);
new_inode.bi_subvol = subvolid;
int ret = bch2_inode_create(trans, &inode_iter, &new_inode, snapshotid, cpu) ?:
bch2_btree_iter_traverse(&inode_iter) ?:
bch2_inode_write(trans, &inode_iter, &new_inode);
bch2_trans_iter_exit(trans, &inode_iter);
if (ret)
return ret;
inum = new_inode.bi_inum;
}
bch_info(c, "reconstructing subvol %u with root inode %llu", subvolid, inum);
struct bkey_i_subvolume *new_subvol = bch2_trans_kmalloc(trans, sizeof(*new_subvol));
int ret = PTR_ERR_OR_ZERO(new_subvol);
if (ret)
return ret;
bkey_subvolume_init(&new_subvol->k_i);
new_subvol->k.p.offset = subvolid;
new_subvol->v.snapshot = cpu_to_le32(snapshotid);
new_subvol->v.inode = cpu_to_le64(inum);
ret = bch2_btree_insert_trans(trans, BTREE_ID_subvolumes, &new_subvol->k_i, 0);
if (ret)
return ret;
struct btree_iter iter;
struct bkey_i_snapshot *s = bch2_bkey_get_mut_typed(trans, &iter,
BTREE_ID_snapshots, POS(0, snapshotid),
0, snapshot);
ret = PTR_ERR_OR_ZERO(s);
bch_err_msg(c, ret, "getting snapshot %u", snapshotid);
if (ret)
return ret;
u32 snapshot_tree = le32_to_cpu(s->v.tree);
s->v.subvol = cpu_to_le32(subvolid);
SET_BCH_SNAPSHOT_SUBVOL(&s->v, true);
bch2_trans_iter_exit(trans, &iter);
struct bkey_i_snapshot_tree *st = bch2_bkey_get_mut_typed(trans, &iter,
BTREE_ID_snapshot_trees, POS(0, snapshot_tree),
0, snapshot_tree);
ret = PTR_ERR_OR_ZERO(st);
bch_err_msg(c, ret, "getting snapshot tree %u", snapshot_tree);
if (ret)
return ret;
if (!st->v.master_subvol)
st->v.master_subvol = cpu_to_le32(subvolid);
bch2_trans_iter_exit(trans, &iter);
return 0;
}
static int reconstruct_inode(struct btree_trans *trans, enum btree_id btree, u32 snapshot, u64 inum)
{
struct bch_fs *c = trans->c;
unsigned i_mode = S_IFREG;
u64 i_size = 0;
switch (btree) {
case BTREE_ID_extents: {
struct btree_iter iter = {};
bch2_trans_iter_init(trans, &iter, BTREE_ID_extents, SPOS(inum, U64_MAX, snapshot), 0);
struct bkey_s_c k = bch2_btree_iter_peek_prev(&iter);
bch2_trans_iter_exit(trans, &iter);
int ret = bkey_err(k);
if (ret)
return ret;
i_size = k.k->p.offset << 9;
break;
}
case BTREE_ID_dirents:
i_mode = S_IFDIR;
break;
case BTREE_ID_xattrs:
break;
default:
BUG();
}
struct bch_inode_unpacked new_inode;
bch2_inode_init_early(c, &new_inode);
bch2_inode_init_late(&new_inode, bch2_current_time(c), 0, 0, i_mode|0600, 0, NULL);
new_inode.bi_size = i_size;
new_inode.bi_inum = inum;
return __bch2_fsck_write_inode(trans, &new_inode, snapshot);
}
struct snapshots_seen {
struct bpos pos;
snapshot_id_list ids;
};
static inline void snapshots_seen_exit(struct snapshots_seen *s)
{
darray_exit(&s->ids);
}
static inline void snapshots_seen_init(struct snapshots_seen *s)
{
memset(s, 0, sizeof(*s));
}
static int snapshots_seen_add_inorder(struct bch_fs *c, struct snapshots_seen *s, u32 id)
{
u32 *i;
__darray_for_each(s->ids, i) {
if (*i == id)
return 0;
if (*i > id)
break;
}
int ret = darray_insert_item(&s->ids, i - s->ids.data, id);
if (ret)
bch_err(c, "error reallocating snapshots_seen table (size %zu)",
s->ids.size);
return ret;
}
static int snapshots_seen_update(struct bch_fs *c, struct snapshots_seen *s,
enum btree_id btree_id, struct bpos pos)
{
if (!bkey_eq(s->pos, pos))
s->ids.nr = 0;
s->pos = pos;
return snapshot_list_add_nodup(c, &s->ids, pos.snapshot);
}
/**
* key_visible_in_snapshot - returns true if @id is a descendent of @ancestor,
* and @ancestor hasn't been overwritten in @seen
*
* @c: filesystem handle
* @seen: list of snapshot ids already seen at current position
* @id: descendent snapshot id
* @ancestor: ancestor snapshot id
*
* Returns: whether key in @ancestor snapshot is visible in @id snapshot
*/
static bool key_visible_in_snapshot(struct bch_fs *c, struct snapshots_seen *seen,
u32 id, u32 ancestor)
{
ssize_t i;
EBUG_ON(id > ancestor);
/* @ancestor should be the snapshot most recently added to @seen */
EBUG_ON(ancestor != seen->pos.snapshot);
EBUG_ON(ancestor != darray_last(seen->ids));
if (id == ancestor)
return true;
if (!bch2_snapshot_is_ancestor(c, id, ancestor))
return false;
/*
* We know that @id is a descendant of @ancestor, we're checking if
* we've seen a key that overwrote @ancestor - i.e. also a descendent of
* @ascestor and with @id as a descendent.
*
* But we already know that we're scanning IDs between @id and @ancestor
* numerically, since snapshot ID lists are kept sorted, so if we find
* an id that's an ancestor of @id we're done:
*/
for (i = seen->ids.nr - 2;
i >= 0 && seen->ids.data[i] >= id;
--i)
if (bch2_snapshot_is_ancestor(c, id, seen->ids.data[i]))
return false;
return true;
}
/**
* ref_visible - given a key with snapshot id @src that points to a key with
* snapshot id @dst, test whether there is some snapshot in which @dst is
* visible.
*
* @c: filesystem handle
* @s: list of snapshot IDs already seen at @src
* @src: snapshot ID of src key
* @dst: snapshot ID of dst key
* Returns: true if there is some snapshot in which @dst is visible
*
* Assumes we're visiting @src keys in natural key order
*/
static bool ref_visible(struct bch_fs *c, struct snapshots_seen *s,
u32 src, u32 dst)
{
return dst <= src
? key_visible_in_snapshot(c, s, dst, src)
: bch2_snapshot_is_ancestor(c, src, dst);
}
static int ref_visible2(struct bch_fs *c,
u32 src, struct snapshots_seen *src_seen,
u32 dst, struct snapshots_seen *dst_seen)
{
if (dst > src) {
swap(dst, src);
swap(dst_seen, src_seen);
}
return key_visible_in_snapshot(c, src_seen, dst, src);
}
#define for_each_visible_inode(_c, _s, _w, _snapshot, _i) \
for (_i = (_w)->inodes.data; _i < (_w)->inodes.data + (_w)->inodes.nr && \
(_i)->snapshot <= (_snapshot); _i++) \
if (key_visible_in_snapshot(_c, _s, _i->snapshot, _snapshot))
struct inode_walker_entry {
struct bch_inode_unpacked inode;
u32 snapshot;
u64 count;
};
struct inode_walker {
bool first_this_inode;
bool have_inodes;
bool recalculate_sums;
struct bpos last_pos;
DARRAY(struct inode_walker_entry) inodes;
};
static void inode_walker_exit(struct inode_walker *w)
{
darray_exit(&w->inodes);
}
static struct inode_walker inode_walker_init(void)
{
return (struct inode_walker) { 0, };
}
static int add_inode(struct bch_fs *c, struct inode_walker *w,
struct bkey_s_c inode)
{
struct bch_inode_unpacked u;
BUG_ON(bch2_inode_unpack(inode, &u));
return darray_push(&w->inodes, ((struct inode_walker_entry) {
.inode = u,
.snapshot = inode.k->p.snapshot,
}));
}
static int get_inodes_all_snapshots(struct btree_trans *trans,
struct inode_walker *w, u64 inum)
{
struct bch_fs *c = trans->c;
struct btree_iter iter;
struct bkey_s_c k;
int ret;
/*
* We no longer have inodes for w->last_pos; clear this to avoid
* screwing up check_i_sectors/check_subdir_count if we take a
* transaction restart here:
*/
w->have_inodes = false;
w->recalculate_sums = false;
w->inodes.nr = 0;
for_each_btree_key_norestart(trans, iter, BTREE_ID_inodes, POS(0, inum),
BTREE_ITER_all_snapshots, k, ret) {
if (k.k->p.offset != inum)
break;
if (bkey_is_inode(k.k))
add_inode(c, w, k);
}
bch2_trans_iter_exit(trans, &iter);
if (ret)
return ret;
w->first_this_inode = true;
w->have_inodes = true;
return 0;
}
static struct inode_walker_entry *
lookup_inode_for_snapshot(struct bch_fs *c, struct inode_walker *w, struct bkey_s_c k)
{
bool is_whiteout = k.k->type == KEY_TYPE_whiteout;
struct inode_walker_entry *i;
__darray_for_each(w->inodes, i)
if (bch2_snapshot_is_ancestor(c, k.k->p.snapshot, i->snapshot))
goto found;
return NULL;
found:
BUG_ON(k.k->p.snapshot > i->snapshot);
if (k.k->p.snapshot != i->snapshot && !is_whiteout) {
struct inode_walker_entry new = *i;
new.snapshot = k.k->p.snapshot;
new.count = 0;
struct printbuf buf = PRINTBUF;
bch2_bkey_val_to_text(&buf, c, k);
bch_info(c, "have key for inode %llu:%u but have inode in ancestor snapshot %u\n"
"unexpected because we should always update the inode when we update a key in that inode\n"
"%s",
w->last_pos.inode, k.k->p.snapshot, i->snapshot, buf.buf);
printbuf_exit(&buf);
while (i > w->inodes.data && i[-1].snapshot > k.k->p.snapshot)
--i;
size_t pos = i - w->inodes.data;
int ret = darray_insert_item(&w->inodes, pos, new);
if (ret)
return ERR_PTR(ret);
i = w->inodes.data + pos;
}
return i;
}
static struct inode_walker_entry *walk_inode(struct btree_trans *trans,
struct inode_walker *w,
struct bkey_s_c k)
{
if (w->last_pos.inode != k.k->p.inode) {
int ret = get_inodes_all_snapshots(trans, w, k.k->p.inode);
if (ret)
return ERR_PTR(ret);
}
w->last_pos = k.k->p;
return lookup_inode_for_snapshot(trans->c, w, k);
}
static int get_visible_inodes(struct btree_trans *trans,
struct inode_walker *w,
struct snapshots_seen *s,
u64 inum)
{
struct bch_fs *c = trans->c;
struct btree_iter iter;
struct bkey_s_c k;
int ret;
w->inodes.nr = 0;
for_each_btree_key_norestart(trans, iter, BTREE_ID_inodes, POS(0, inum),
BTREE_ITER_all_snapshots, k, ret) {
if (k.k->p.offset != inum)
break;
if (!ref_visible(c, s, s->pos.snapshot, k.k->p.snapshot))
continue;
if (bkey_is_inode(k.k))
add_inode(c, w, k);
if (k.k->p.snapshot >= s->pos.snapshot)
break;
}
bch2_trans_iter_exit(trans, &iter);
return ret;
}
static int hash_redo_key(struct btree_trans *trans,
const struct bch_hash_desc desc,
struct bch_hash_info *hash_info,
struct btree_iter *k_iter, struct bkey_s_c k)
{
struct bkey_i *delete;
struct bkey_i *tmp;
delete = bch2_trans_kmalloc(trans, sizeof(*delete));
if (IS_ERR(delete))
return PTR_ERR(delete);
tmp = bch2_bkey_make_mut_noupdate(trans, k);
if (IS_ERR(tmp))
return PTR_ERR(tmp);
bkey_init(&delete->k);
delete->k.p = k_iter->pos;
return bch2_btree_iter_traverse(k_iter) ?:
bch2_trans_update(trans, k_iter, delete, 0) ?:
bch2_hash_set_in_snapshot(trans, desc, hash_info,
(subvol_inum) { 0, k.k->p.inode },
k.k->p.snapshot, tmp,
STR_HASH_must_create|
BTREE_UPDATE_internal_snapshot_node) ?:
bch2_trans_commit(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc);
}
static int hash_check_key(struct btree_trans *trans,
const struct bch_hash_desc desc,
struct bch_hash_info *hash_info,
struct btree_iter *k_iter, struct bkey_s_c hash_k)
{
struct bch_fs *c = trans->c;
struct btree_iter iter = { NULL };
struct printbuf buf = PRINTBUF;
struct bkey_s_c k;
u64 hash;
int ret = 0;
if (hash_k.k->type != desc.key_type)
return 0;
hash = desc.hash_bkey(hash_info, hash_k);
if (likely(hash == hash_k.k->p.offset))
return 0;
if (hash_k.k->p.offset < hash)
goto bad_hash;
for_each_btree_key_norestart(trans, iter, desc.btree_id,
SPOS(hash_k.k->p.inode, hash, hash_k.k->p.snapshot),
BTREE_ITER_slots, k, ret) {
if (bkey_eq(k.k->p, hash_k.k->p))
break;
if (fsck_err_on(k.k->type == desc.key_type &&
!desc.cmp_bkey(k, hash_k),
trans, hash_table_key_duplicate,
"duplicate hash table keys:\n%s",
(printbuf_reset(&buf),
bch2_bkey_val_to_text(&buf, c, hash_k),
buf.buf))) {
ret = bch2_hash_delete_at(trans, desc, hash_info, k_iter, 0) ?: 1;
break;
}
if (bkey_deleted(k.k)) {
bch2_trans_iter_exit(trans, &iter);
goto bad_hash;
}
}
out:
bch2_trans_iter_exit(trans, &iter);
printbuf_exit(&buf);
return ret;
bad_hash:
if (fsck_err(trans, hash_table_key_wrong_offset,
"hash table key at wrong offset: btree %s inode %llu offset %llu, hashed to %llu\n%s",
bch2_btree_id_str(desc.btree_id), hash_k.k->p.inode, hash_k.k->p.offset, hash,
(printbuf_reset(&buf),
bch2_bkey_val_to_text(&buf, c, hash_k), buf.buf))) {
ret = hash_redo_key(trans, desc, hash_info, k_iter, hash_k);
bch_err_fn(c, ret);
if (ret)
return ret;
ret = -BCH_ERR_transaction_restart_nested;
}
fsck_err:
goto out;
}
static struct bkey_s_c_dirent dirent_get_by_pos(struct btree_trans *trans,
struct btree_iter *iter,
struct bpos pos)
{
return bch2_bkey_get_iter_typed(trans, iter, BTREE_ID_dirents, pos, 0, dirent);
}
static struct bkey_s_c_dirent inode_get_dirent(struct btree_trans *trans,
struct btree_iter *iter,
struct bch_inode_unpacked *inode,
u32 *snapshot)
{
if (inode->bi_subvol) {
u64 inum;
int ret = subvol_lookup(trans, inode->bi_parent_subvol, snapshot, &inum);
if (ret)
return ((struct bkey_s_c_dirent) { .k = ERR_PTR(ret) });
}
return dirent_get_by_pos(trans, iter, SPOS(inode->bi_dir, inode->bi_dir_offset, *snapshot));
}
static int check_inode_deleted_list(struct btree_trans *trans, struct bpos p)
{
struct btree_iter iter;
struct bkey_s_c k = bch2_bkey_get_iter(trans, &iter, BTREE_ID_deleted_inodes, p, 0);
int ret = bkey_err(k) ?: k.k->type == KEY_TYPE_set;
bch2_trans_iter_exit(trans, &iter);
return ret;
}
static int check_inode_dirent_inode(struct btree_trans *trans,
struct bch_inode_unpacked *inode,
bool *write_inode)
{
struct bch_fs *c = trans->c;
struct printbuf buf = PRINTBUF;
u32 inode_snapshot = inode->bi_snapshot;
struct btree_iter dirent_iter = {};
struct bkey_s_c_dirent d = inode_get_dirent(trans, &dirent_iter, inode, &inode_snapshot);
int ret = bkey_err(d);
if (ret && !bch2_err_matches(ret, ENOENT))
return ret;
if (fsck_err_on(ret,
trans, inode_points_to_missing_dirent,
"inode points to missing dirent\n%s",
(bch2_inode_unpacked_to_text(&buf, inode), buf.buf)) ||
fsck_err_on(!ret && dirent_points_to_inode_nowarn(d, inode),
trans, inode_points_to_wrong_dirent,
"%s",
(printbuf_reset(&buf),
dirent_inode_mismatch_msg(&buf, c, d, inode),
buf.buf))) {
/*
* We just clear the backpointer fields for now. If we find a
* dirent that points to this inode in check_dirents(), we'll
* update it then; then when we get to check_path() if the
* backpointer is still 0 we'll reattach it.
*/
inode->bi_dir = 0;
inode->bi_dir_offset = 0;
inode->bi_flags &= ~BCH_INODE_backptr_untrusted;
*write_inode = true;
}
ret = 0;
fsck_err:
bch2_trans_iter_exit(trans, &dirent_iter);
printbuf_exit(&buf);
bch_err_fn(c, ret);
return ret;
}
static bool bch2_inode_is_open(struct bch_fs *c, struct bpos p)
{
subvol_inum inum = {
.subvol = snapshot_t(c, p.snapshot)->subvol,
.inum = p.offset,
};
/* snapshot tree corruption, can't safely delete */
if (!inum.subvol) {
bch_warn_ratelimited(c, "%s(): snapshot %u has no subvol, unlinked but can't safely delete", __func__, p.snapshot);
return true;
}
return __bch2_inode_hash_find(c, inum) != NULL;
}
static int check_inode(struct btree_trans *trans,
struct btree_iter *iter,
struct bkey_s_c k,
struct bch_inode_unpacked *prev,
struct snapshots_seen *s,
bool full)
{
struct bch_fs *c = trans->c;
struct bch_inode_unpacked u;
bool do_update = false;
int ret;
ret = bch2_check_key_has_snapshot(trans, iter, k);
if (ret < 0)
goto err;
if (ret)
return 0;
ret = snapshots_seen_update(c, s, iter->btree_id, k.k->p);
if (ret)
goto err;
if (!bkey_is_inode(k.k))
return 0;
BUG_ON(bch2_inode_unpack(k, &u));
if (!full &&
!(u.bi_flags & (BCH_INODE_i_size_dirty|
BCH_INODE_i_sectors_dirty|
BCH_INODE_unlinked)))
return 0;
if (prev->bi_inum != u.bi_inum)
*prev = u;
if (fsck_err_on(prev->bi_hash_seed != u.bi_hash_seed ||
inode_d_type(prev) != inode_d_type(&u),
trans, inode_snapshot_mismatch,
"inodes in different snapshots don't match")) {
bch_err(c, "repair not implemented yet");
return -BCH_ERR_fsck_repair_unimplemented;
}
if ((u.bi_flags & (BCH_INODE_i_size_dirty|BCH_INODE_unlinked)) &&
bch2_key_has_snapshot_overwrites(trans, BTREE_ID_inodes, k.k->p)) {
struct bpos new_min_pos;
ret = bch2_propagate_key_to_snapshot_leaves(trans, iter->btree_id, k, &new_min_pos);
if (ret)
goto err;
u.bi_flags &= ~BCH_INODE_i_size_dirty|BCH_INODE_unlinked;
ret = __bch2_fsck_write_inode(trans, &u, iter->pos.snapshot);
bch_err_msg(c, ret, "in fsck updating inode");
if (ret)
return ret;
if (!bpos_eq(new_min_pos, POS_MIN))
bch2_btree_iter_set_pos(iter, bpos_predecessor(new_min_pos));
return 0;
}
if (u.bi_flags & BCH_INODE_unlinked) {
if (!test_bit(BCH_FS_started, &c->flags)) {
/*
* If we're not in online fsck, don't delete unlinked
* inodes, just make sure they're on the deleted list.
*
* They might be referred to by a logged operation -
* i.e. we might have crashed in the middle of a
* truncate on an unlinked but open file - so we want to
* let the delete_dead_inodes kill it after resuming
* logged ops.
*/
ret = check_inode_deleted_list(trans, k.k->p);
if (ret < 0)
return ret;
fsck_err_on(!ret,
trans, unlinked_inode_not_on_deleted_list,
"inode %llu:%u unlinked, but not on deleted list",
u.bi_inum, k.k->p.snapshot);
ret = bch2_btree_bit_mod_buffered(trans, BTREE_ID_deleted_inodes, k.k->p, 1);
if (ret)
goto err;
} else {
if (fsck_err_on(bch2_inode_is_open(c, k.k->p),
trans, inode_unlinked_and_not_open,
"inode %llu%u unlinked and not open",
u.bi_inum, u.bi_snapshot)) {
ret = bch2_inode_rm_snapshot(trans, u.bi_inum, iter->pos.snapshot);
bch_err_msg(c, ret, "in fsck deleting inode");
return ret;
}
}
}
/* i_size_dirty is vestigal, since we now have logged ops for truncate * */
if (u.bi_flags & BCH_INODE_i_size_dirty &&
(!test_bit(BCH_FS_clean_recovery, &c->flags) ||
fsck_err(trans, inode_i_size_dirty_but_clean,
"filesystem marked clean, but inode %llu has i_size dirty",
u.bi_inum))) {
bch_verbose(c, "truncating inode %llu", u.bi_inum);
/*
* XXX: need to truncate partial blocks too here - or ideally
* just switch units to bytes and that issue goes away
*/
ret = bch2_btree_delete_range_trans(trans, BTREE_ID_extents,
SPOS(u.bi_inum, round_up(u.bi_size, block_bytes(c)) >> 9,
iter->pos.snapshot),
POS(u.bi_inum, U64_MAX),
0, NULL);
bch_err_msg(c, ret, "in fsck truncating inode");
if (ret)
return ret;
/*
* We truncated without our normal sector accounting hook, just
* make sure we recalculate it:
*/
u.bi_flags |= BCH_INODE_i_sectors_dirty;
u.bi_flags &= ~BCH_INODE_i_size_dirty;
do_update = true;
}
/* i_sectors_dirty is vestigal, i_sectors is always updated transactionally */
if (u.bi_flags & BCH_INODE_i_sectors_dirty &&
(!test_bit(BCH_FS_clean_recovery, &c->flags) ||
fsck_err(trans, inode_i_sectors_dirty_but_clean,
"filesystem marked clean, but inode %llu has i_sectors dirty",
u.bi_inum))) {
s64 sectors;
bch_verbose(c, "recounting sectors for inode %llu",
u.bi_inum);
sectors = bch2_count_inode_sectors(trans, u.bi_inum, iter->pos.snapshot);
if (sectors < 0) {
bch_err_msg(c, sectors, "in fsck recounting inode sectors");
return sectors;
}
u.bi_sectors = sectors;
u.bi_flags &= ~BCH_INODE_i_sectors_dirty;
do_update = true;
}
if (u.bi_flags & BCH_INODE_backptr_untrusted) {
u.bi_dir = 0;
u.bi_dir_offset = 0;
u.bi_flags &= ~BCH_INODE_backptr_untrusted;
do_update = true;
}
if (u.bi_dir || u.bi_dir_offset) {
ret = check_inode_dirent_inode(trans, &u, &do_update);
if (ret)
goto err;
}
if (fsck_err_on(u.bi_parent_subvol &&
(u.bi_subvol == 0 ||
u.bi_subvol == BCACHEFS_ROOT_SUBVOL),
trans, inode_bi_parent_nonzero,
"inode %llu:%u has subvol %u but nonzero parent subvol %u",
u.bi_inum, k.k->p.snapshot, u.bi_subvol, u.bi_parent_subvol)) {
u.bi_parent_subvol = 0;
do_update = true;
}
if (u.bi_subvol) {
struct bch_subvolume s;
ret = bch2_subvolume_get(trans, u.bi_subvol, false, 0, &s);
if (ret && !bch2_err_matches(ret, ENOENT))
goto err;
if (ret && (c->sb.btrees_lost_data & BIT_ULL(BTREE_ID_subvolumes))) {
ret = reconstruct_subvol(trans, k.k->p.snapshot, u.bi_subvol, u.bi_inum);
goto do_update;
}
if (fsck_err_on(ret,
trans, inode_bi_subvol_missing,
"inode %llu:%u bi_subvol points to missing subvolume %u",
u.bi_inum, k.k->p.snapshot, u.bi_subvol) ||
fsck_err_on(le64_to_cpu(s.inode) != u.bi_inum ||
!bch2_snapshot_is_ancestor(c, le32_to_cpu(s.snapshot),
k.k->p.snapshot),
trans, inode_bi_subvol_wrong,
"inode %llu:%u points to subvol %u, but subvol points to %llu:%u",
u.bi_inum, k.k->p.snapshot, u.bi_subvol,
le64_to_cpu(s.inode),
le32_to_cpu(s.snapshot))) {
u.bi_subvol = 0;
u.bi_parent_subvol = 0;
do_update = true;
}
}
do_update:
if (do_update) {
ret = __bch2_fsck_write_inode(trans, &u, iter->pos.snapshot);
bch_err_msg(c, ret, "in fsck updating inode");
if (ret)
return ret;
}
err:
fsck_err:
bch_err_fn(c, ret);
return ret;
}
int bch2_check_inodes(struct bch_fs *c)
{
bool full = c->opts.fsck;
struct bch_inode_unpacked prev = { 0 };
struct snapshots_seen s;
snapshots_seen_init(&s);
int ret = bch2_trans_run(c,
for_each_btree_key_commit(trans, iter, BTREE_ID_inodes,
POS_MIN,
BTREE_ITER_prefetch|BTREE_ITER_all_snapshots, k,
NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
check_inode(trans, &iter, k, &prev, &s, full)));
snapshots_seen_exit(&s);
bch_err_fn(c, ret);
return ret;
}
static inline bool btree_matches_i_mode(enum btree_id btree, unsigned mode)
{
switch (btree) {
case BTREE_ID_extents:
return S_ISREG(mode) || S_ISLNK(mode);
case BTREE_ID_dirents:
return S_ISDIR(mode);
case BTREE_ID_xattrs:
return true;
default:
BUG();
}
}
static int check_key_has_inode(struct btree_trans *trans,
struct btree_iter *iter,
struct inode_walker *inode,
struct inode_walker_entry *i,
struct bkey_s_c k)
{
struct bch_fs *c = trans->c;
struct printbuf buf = PRINTBUF;
int ret = PTR_ERR_OR_ZERO(i);
if (ret)
return ret;
if (k.k->type == KEY_TYPE_whiteout)
goto out;
if (!i && (c->sb.btrees_lost_data & BIT_ULL(BTREE_ID_inodes))) {
ret = reconstruct_inode(trans, iter->btree_id, k.k->p.snapshot, k.k->p.inode) ?:
bch2_trans_commit(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc);
if (ret)
goto err;
inode->last_pos.inode--;
ret = -BCH_ERR_transaction_restart_nested;
goto err;
}
if (fsck_err_on(!i,
trans, key_in_missing_inode,
"key in missing inode:\n %s",
(printbuf_reset(&buf),
bch2_bkey_val_to_text(&buf, c, k), buf.buf)))
goto delete;
if (fsck_err_on(i && !btree_matches_i_mode(iter->btree_id, i->inode.bi_mode),
trans, key_in_wrong_inode_type,
"key for wrong inode mode %o:\n %s",
i->inode.bi_mode,
(printbuf_reset(&buf),
bch2_bkey_val_to_text(&buf, c, k), buf.buf)))
goto delete;
out:
err:
fsck_err:
printbuf_exit(&buf);
bch_err_fn(c, ret);
return ret;
delete:
ret = bch2_btree_delete_at(trans, iter, BTREE_UPDATE_internal_snapshot_node);
goto out;
}
static int check_i_sectors_notnested(struct btree_trans *trans, struct inode_walker *w)
{
struct bch_fs *c = trans->c;
int ret = 0;
s64 count2;
darray_for_each(w->inodes, i) {
if (i->inode.bi_sectors == i->count)
continue;
count2 = bch2_count_inode_sectors(trans, w->last_pos.inode, i->snapshot);
if (w->recalculate_sums)
i->count = count2;
if (i->count != count2) {
bch_err_ratelimited(c, "fsck counted i_sectors wrong for inode %llu:%u: got %llu should be %llu",
w->last_pos.inode, i->snapshot, i->count, count2);
return -BCH_ERR_internal_fsck_err;
}
if (fsck_err_on(!(i->inode.bi_flags & BCH_INODE_i_sectors_dirty),
trans, inode_i_sectors_wrong,
"inode %llu:%u has incorrect i_sectors: got %llu, should be %llu",
w->last_pos.inode, i->snapshot,
i->inode.bi_sectors, i->count)) {
i->inode.bi_sectors = i->count;
ret = bch2_fsck_write_inode(trans, &i->inode, i->snapshot);
if (ret)
break;
}
}
fsck_err:
bch_err_fn(c, ret);
return ret;
}
static int check_i_sectors(struct btree_trans *trans, struct inode_walker *w)
{
u32 restart_count = trans->restart_count;
return check_i_sectors_notnested(trans, w) ?:
trans_was_restarted(trans, restart_count);
}
struct extent_end {
u32 snapshot;
u64 offset;
struct snapshots_seen seen;
};
struct extent_ends {
struct bpos last_pos;
DARRAY(struct extent_end) e;
};
static void extent_ends_reset(struct extent_ends *extent_ends)
{
darray_for_each(extent_ends->e, i)
snapshots_seen_exit(&i->seen);
extent_ends->e.nr = 0;
}
static void extent_ends_exit(struct extent_ends *extent_ends)
{
extent_ends_reset(extent_ends);
darray_exit(&extent_ends->e);
}
static void extent_ends_init(struct extent_ends *extent_ends)
{
memset(extent_ends, 0, sizeof(*extent_ends));
}
static int extent_ends_at(struct bch_fs *c,
struct extent_ends *extent_ends,
struct snapshots_seen *seen,
struct bkey_s_c k)
{
struct extent_end *i, n = (struct extent_end) {
.offset = k.k->p.offset,
.snapshot = k.k->p.snapshot,
.seen = *seen,
};
n.seen.ids.data = kmemdup(seen->ids.data,
sizeof(seen->ids.data[0]) * seen->ids.size,
GFP_KERNEL);
if (!n.seen.ids.data)
return -BCH_ERR_ENOMEM_fsck_extent_ends_at;
__darray_for_each(extent_ends->e, i) {
if (i->snapshot == k.k->p.snapshot) {
snapshots_seen_exit(&i->seen);
*i = n;
return 0;
}
if (i->snapshot >= k.k->p.snapshot)
break;
}
return darray_insert_item(&extent_ends->e, i - extent_ends->e.data, n);
}
static int overlapping_extents_found(struct btree_trans *trans,
enum btree_id btree,
struct bpos pos1, struct snapshots_seen *pos1_seen,
struct bkey pos2,
bool *fixed,
struct extent_end *extent_end)
{
struct bch_fs *c = trans->c;
struct printbuf buf = PRINTBUF;
struct btree_iter iter1, iter2 = { NULL };
struct bkey_s_c k1, k2;
int ret;
BUG_ON(bkey_le(pos1, bkey_start_pos(&pos2)));
bch2_trans_iter_init(trans, &iter1, btree, pos1,
BTREE_ITER_all_snapshots|
BTREE_ITER_not_extents);
k1 = bch2_btree_iter_peek_upto(&iter1, POS(pos1.inode, U64_MAX));
ret = bkey_err(k1);
if (ret)
goto err;
prt_str(&buf, "\n ");
bch2_bkey_val_to_text(&buf, c, k1);
if (!bpos_eq(pos1, k1.k->p)) {
prt_str(&buf, "\n wanted\n ");
bch2_bpos_to_text(&buf, pos1);
prt_str(&buf, "\n ");
bch2_bkey_to_text(&buf, &pos2);
bch_err(c, "%s: error finding first overlapping extent when repairing, got%s",
__func__, buf.buf);
ret = -BCH_ERR_internal_fsck_err;
goto err;
}
bch2_trans_copy_iter(&iter2, &iter1);
while (1) {
bch2_btree_iter_advance(&iter2);
k2 = bch2_btree_iter_peek_upto(&iter2, POS(pos1.inode, U64_MAX));
ret = bkey_err(k2);
if (ret)
goto err;
if (bpos_ge(k2.k->p, pos2.p))
break;
}
prt_str(&buf, "\n ");
bch2_bkey_val_to_text(&buf, c, k2);
if (bpos_gt(k2.k->p, pos2.p) ||
pos2.size != k2.k->size) {
bch_err(c, "%s: error finding seconding overlapping extent when repairing%s",
__func__, buf.buf);
ret = -BCH_ERR_internal_fsck_err;
goto err;
}
prt_printf(&buf, "\n overwriting %s extent",
pos1.snapshot >= pos2.p.snapshot ? "first" : "second");
if (fsck_err(trans, extent_overlapping,
"overlapping extents%s", buf.buf)) {
struct btree_iter *old_iter = &iter1;
struct disk_reservation res = { 0 };
if (pos1.snapshot < pos2.p.snapshot) {
old_iter = &iter2;
swap(k1, k2);
}
trans->extra_disk_res += bch2_bkey_sectors_compressed(k2);
ret = bch2_trans_update_extent_overwrite(trans, old_iter,
BTREE_UPDATE_internal_snapshot_node,
k1, k2) ?:
bch2_trans_commit(trans, &res, NULL, BCH_TRANS_COMMIT_no_enospc);
bch2_disk_reservation_put(c, &res);
if (ret)
goto err;
*fixed = true;
if (pos1.snapshot == pos2.p.snapshot) {
/*
* We overwrote the first extent, and did the overwrite
* in the same snapshot:
*/
extent_end->offset = bkey_start_offset(&pos2);
} else if (pos1.snapshot > pos2.p.snapshot) {
/*
* We overwrote the first extent in pos2's snapshot:
*/
ret = snapshots_seen_add_inorder(c, pos1_seen, pos2.p.snapshot);
} else {
/*
* We overwrote the second extent - restart
* check_extent() from the top:
*/
ret = -BCH_ERR_transaction_restart_nested;
}
}
fsck_err:
err:
bch2_trans_iter_exit(trans, &iter2);
bch2_trans_iter_exit(trans, &iter1);
printbuf_exit(&buf);
return ret;
}
static int check_overlapping_extents(struct btree_trans *trans,
struct snapshots_seen *seen,
struct extent_ends *extent_ends,
struct bkey_s_c k,
struct btree_iter *iter,
bool *fixed)
{
struct bch_fs *c = trans->c;
int ret = 0;
/* transaction restart, running again */
if (bpos_eq(extent_ends->last_pos, k.k->p))
return 0;
if (extent_ends->last_pos.inode != k.k->p.inode)
extent_ends_reset(extent_ends);
darray_for_each(extent_ends->e, i) {
if (i->offset <= bkey_start_offset(k.k))
continue;
if (!ref_visible2(c,
k.k->p.snapshot, seen,
i->snapshot, &i->seen))
continue;
ret = overlapping_extents_found(trans, iter->btree_id,
SPOS(iter->pos.inode,
i->offset,
i->snapshot),
&i->seen,
*k.k, fixed, i);
if (ret)
goto err;
}
extent_ends->last_pos = k.k->p;
err:
return ret;
}
static int check_extent_overbig(struct btree_trans *trans, struct btree_iter *iter,
struct bkey_s_c k)
{
struct bch_fs *c = trans->c;
struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
struct bch_extent_crc_unpacked crc;
const union bch_extent_entry *i;
unsigned encoded_extent_max_sectors = c->opts.encoded_extent_max >> 9;
bkey_for_each_crc(k.k, ptrs, crc, i)
if (crc_is_encoded(crc) &&
crc.uncompressed_size > encoded_extent_max_sectors) {
struct printbuf buf = PRINTBUF;
bch2_bkey_val_to_text(&buf, c, k);
bch_err(c, "overbig encoded extent, please report this:\n %s", buf.buf);
printbuf_exit(&buf);
}
return 0;
}
static int check_extent(struct btree_trans *trans, struct btree_iter *iter,
struct bkey_s_c k,
struct inode_walker *inode,
struct snapshots_seen *s,
struct extent_ends *extent_ends,
struct disk_reservation *res)
{
struct bch_fs *c = trans->c;
struct printbuf buf = PRINTBUF;
int ret = 0;
ret = bch2_check_key_has_snapshot(trans, iter, k);
if (ret) {
ret = ret < 0 ? ret : 0;
goto out;
}
if (inode->last_pos.inode != k.k->p.inode && inode->have_inodes) {
ret = check_i_sectors(trans, inode);
if (ret)
goto err;
}
ret = snapshots_seen_update(c, s, iter->btree_id, k.k->p);
if (ret)
goto err;
struct inode_walker_entry *extent_i = walk_inode(trans, inode, k);
ret = PTR_ERR_OR_ZERO(extent_i);
if (ret)
goto err;
ret = check_key_has_inode(trans, iter, inode, extent_i, k);
if (ret)
goto err;
if (k.k->type != KEY_TYPE_whiteout) {
ret = check_overlapping_extents(trans, s, extent_ends, k, iter,
&inode->recalculate_sums);
if (ret)
goto err;
/*
* Check inodes in reverse order, from oldest snapshots to
* newest, starting from the inode that matches this extent's
* snapshot. If we didn't have one, iterate over all inodes:
*/
for (struct inode_walker_entry *i = extent_i ?: &darray_last(inode->inodes);
inode->inodes.data && i >= inode->inodes.data;
--i) {
if (i->snapshot > k.k->p.snapshot ||
!key_visible_in_snapshot(c, s, i->snapshot, k.k->p.snapshot))
continue;
if (fsck_err_on(!(i->inode.bi_flags & BCH_INODE_i_size_dirty) &&
k.k->p.offset > round_up(i->inode.bi_size, block_bytes(c)) >> 9 &&
!bkey_extent_is_reservation(k),
trans, extent_past_end_of_inode,
"extent type past end of inode %llu:%u, i_size %llu\n %s",
i->inode.bi_inum, i->snapshot, i->inode.bi_size,
(bch2_bkey_val_to_text(&buf, c, k), buf.buf))) {
struct btree_iter iter2;
bch2_trans_copy_iter(&iter2, iter);
bch2_btree_iter_set_snapshot(&iter2, i->snapshot);
ret = bch2_btree_iter_traverse(&iter2) ?:
bch2_btree_delete_at(trans, &iter2,
BTREE_UPDATE_internal_snapshot_node);
bch2_trans_iter_exit(trans, &iter2);
if (ret)
goto err;
iter->k.type = KEY_TYPE_whiteout;
break;
}
}
}
ret = bch2_trans_commit(trans, res, NULL, BCH_TRANS_COMMIT_no_enospc);
if (ret)
goto err;
if (bkey_extent_is_allocation(k.k)) {
for (struct inode_walker_entry *i = extent_i ?: &darray_last(inode->inodes);
inode->inodes.data && i >= inode->inodes.data;
--i) {
if (i->snapshot > k.k->p.snapshot ||
!key_visible_in_snapshot(c, s, i->snapshot, k.k->p.snapshot))
continue;
i->count += k.k->size;
}
}
if (k.k->type != KEY_TYPE_whiteout) {
ret = extent_ends_at(c, extent_ends, s, k);
if (ret)
goto err;
}
out:
err:
fsck_err:
printbuf_exit(&buf);
bch_err_fn(c, ret);
return ret;
}
/*
* Walk extents: verify that extents have a corresponding S_ISREG inode, and
* that i_size an i_sectors are consistent
*/
int bch2_check_extents(struct bch_fs *c)
{
struct inode_walker w = inode_walker_init();
struct snapshots_seen s;
struct extent_ends extent_ends;
struct disk_reservation res = { 0 };
snapshots_seen_init(&s);
extent_ends_init(&extent_ends);
int ret = bch2_trans_run(c,
for_each_btree_key(trans, iter, BTREE_ID_extents,
POS(BCACHEFS_ROOT_INO, 0),
BTREE_ITER_prefetch|BTREE_ITER_all_snapshots, k, ({
bch2_disk_reservation_put(c, &res);
check_extent(trans, &iter, k, &w, &s, &extent_ends, &res) ?:
check_extent_overbig(trans, &iter, k);
})) ?:
check_i_sectors_notnested(trans, &w));
bch2_disk_reservation_put(c, &res);
extent_ends_exit(&extent_ends);
inode_walker_exit(&w);
snapshots_seen_exit(&s);
bch_err_fn(c, ret);
return ret;
}
int bch2_check_indirect_extents(struct bch_fs *c)
{
struct disk_reservation res = { 0 };
int ret = bch2_trans_run(c,
for_each_btree_key_commit(trans, iter, BTREE_ID_reflink,
POS_MIN,
BTREE_ITER_prefetch, k,
&res, NULL,
BCH_TRANS_COMMIT_no_enospc, ({
bch2_disk_reservation_put(c, &res);
check_extent_overbig(trans, &iter, k);
})));
bch2_disk_reservation_put(c, &res);
bch_err_fn(c, ret);
return ret;
}
static int check_subdir_count_notnested(struct btree_trans *trans, struct inode_walker *w)
{
struct bch_fs *c = trans->c;
int ret = 0;
s64 count2;
darray_for_each(w->inodes, i) {
if (i->inode.bi_nlink == i->count)
continue;
count2 = bch2_count_subdirs(trans, w->last_pos.inode, i->snapshot);
if (count2 < 0)
return count2;
if (i->count != count2) {
bch_err_ratelimited(c, "fsck counted subdirectories wrong for inum %llu:%u: got %llu should be %llu",
w->last_pos.inode, i->snapshot, i->count, count2);
i->count = count2;
if (i->inode.bi_nlink == i->count)
continue;
}
if (fsck_err_on(i->inode.bi_nlink != i->count,
trans, inode_dir_wrong_nlink,
"directory %llu:%u with wrong i_nlink: got %u, should be %llu",
w->last_pos.inode, i->snapshot, i->inode.bi_nlink, i->count)) {
i->inode.bi_nlink = i->count;
ret = bch2_fsck_write_inode(trans, &i->inode, i->snapshot);
if (ret)
break;
}
}
fsck_err:
bch_err_fn(c, ret);
return ret;
}
static int check_subdir_count(struct btree_trans *trans, struct inode_walker *w)
{
u32 restart_count = trans->restart_count;
return check_subdir_count_notnested(trans, w) ?:
trans_was_restarted(trans, restart_count);
}
noinline_for_stack
static int check_dirent_inode_dirent(struct btree_trans *trans,
struct btree_iter *iter,
struct bkey_s_c_dirent d,
struct bch_inode_unpacked *target,
u32 target_snapshot)
{
struct bch_fs *c = trans->c;
struct printbuf buf = PRINTBUF;
struct btree_iter bp_iter = { NULL };
int ret = 0;
if (inode_points_to_dirent(target, d))
return 0;
if (bch2_inode_should_have_bp(target) &&
!fsck_err(trans, inode_wrong_backpointer,
"dirent points to inode that does not point back:\n %s",
(bch2_bkey_val_to_text(&buf, c, d.s_c),
prt_printf(&buf, "\n "),
bch2_inode_unpacked_to_text(&buf, target),
buf.buf)))
goto err;
if (!target->bi_dir &&
!target->bi_dir_offset) {
target->bi_dir = d.k->p.inode;
target->bi_dir_offset = d.k->p.offset;
return __bch2_fsck_write_inode(trans, target, target_snapshot);
}
struct bkey_s_c_dirent bp_dirent = dirent_get_by_pos(trans, &bp_iter,
SPOS(target->bi_dir, target->bi_dir_offset, target_snapshot));
ret = bkey_err(bp_dirent);
if (ret && !bch2_err_matches(ret, ENOENT))
goto err;
bool backpointer_exists = !ret;
ret = 0;
if (fsck_err_on(!backpointer_exists,
trans, inode_wrong_backpointer,
"inode %llu:%u has wrong backpointer:\n"
"got %llu:%llu\n"
"should be %llu:%llu",
target->bi_inum, target_snapshot,
target->bi_dir,
target->bi_dir_offset,
d.k->p.inode,
d.k->p.offset)) {
target->bi_dir = d.k->p.inode;
target->bi_dir_offset = d.k->p.offset;
ret = __bch2_fsck_write_inode(trans, target, target_snapshot);
goto out;
}
bch2_bkey_val_to_text(&buf, c, d.s_c);
prt_newline(&buf);
if (backpointer_exists)
bch2_bkey_val_to_text(&buf, c, bp_dirent.s_c);
if (fsck_err_on(backpointer_exists &&
(S_ISDIR(target->bi_mode) ||
target->bi_subvol),
trans, inode_dir_multiple_links,
"%s %llu:%u with multiple links\n%s",
S_ISDIR(target->bi_mode) ? "directory" : "subvolume",
target->bi_inum, target_snapshot, buf.buf)) {
ret = __remove_dirent(trans, d.k->p);
goto out;
}
/*
* hardlinked file with nlink 0:
* We're just adjusting nlink here so check_nlinks() will pick
* it up, it ignores inodes with nlink 0
*/
if (fsck_err_on(backpointer_exists && !target->bi_nlink,
trans, inode_multiple_links_but_nlink_0,
"inode %llu:%u type %s has multiple links but i_nlink 0\n%s",
target->bi_inum, target_snapshot, bch2_d_types[d.v->d_type], buf.buf)) {
target->bi_nlink++;
target->bi_flags &= ~BCH_INODE_unlinked;
ret = __bch2_fsck_write_inode(trans, target, target_snapshot);
if (ret)
goto err;
}
out:
err:
fsck_err:
bch2_trans_iter_exit(trans, &bp_iter);
printbuf_exit(&buf);
bch_err_fn(c, ret);
return ret;
}
noinline_for_stack
static int check_dirent_target(struct btree_trans *trans,
struct btree_iter *iter,
struct bkey_s_c_dirent d,
struct bch_inode_unpacked *target,
u32 target_snapshot)
{
struct bch_fs *c = trans->c;
struct bkey_i_dirent *n;
struct printbuf buf = PRINTBUF;
int ret = 0;
ret = check_dirent_inode_dirent(trans, iter, d, target, target_snapshot);
if (ret)
goto err;
if (fsck_err_on(d.v->d_type != inode_d_type(target),
trans, dirent_d_type_wrong,
"incorrect d_type: got %s, should be %s:\n%s",
bch2_d_type_str(d.v->d_type),
bch2_d_type_str(inode_d_type(target)),
(printbuf_reset(&buf),
bch2_bkey_val_to_text(&buf, c, d.s_c), buf.buf))) {
n = bch2_trans_kmalloc(trans, bkey_bytes(d.k));
ret = PTR_ERR_OR_ZERO(n);
if (ret)
goto err;
bkey_reassemble(&n->k_i, d.s_c);
n->v.d_type = inode_d_type(target);
if (n->v.d_type == DT_SUBVOL) {
n->v.d_parent_subvol = cpu_to_le32(target->bi_parent_subvol);
n->v.d_child_subvol = cpu_to_le32(target->bi_subvol);
} else {
n->v.d_inum = cpu_to_le64(target->bi_inum);
}
ret = bch2_trans_update(trans, iter, &n->k_i, 0);
if (ret)
goto err;
d = dirent_i_to_s_c(n);
}
err:
fsck_err:
printbuf_exit(&buf);
bch_err_fn(c, ret);
return ret;
}
/* find a subvolume that's a descendent of @snapshot: */
static int find_snapshot_subvol(struct btree_trans *trans, u32 snapshot, u32 *subvolid)
{
struct btree_iter iter;
struct bkey_s_c k;
int ret;
for_each_btree_key_norestart(trans, iter, BTREE_ID_subvolumes, POS_MIN, 0, k, ret) {
if (k.k->type != KEY_TYPE_subvolume)
continue;
struct bkey_s_c_subvolume s = bkey_s_c_to_subvolume(k);
if (bch2_snapshot_is_ancestor(trans->c, le32_to_cpu(s.v->snapshot), snapshot)) {
bch2_trans_iter_exit(trans, &iter);
*subvolid = k.k->p.offset;
goto found;
}
}
if (!ret)
ret = -ENOENT;
found:
bch2_trans_iter_exit(trans, &iter);
return ret;
}
noinline_for_stack
static int check_dirent_to_subvol(struct btree_trans *trans, struct btree_iter *iter,
struct bkey_s_c_dirent d)
{
struct bch_fs *c = trans->c;
struct btree_iter subvol_iter = {};
struct bch_inode_unpacked subvol_root;
u32 parent_subvol = le32_to_cpu(d.v->d_parent_subvol);
u32 target_subvol = le32_to_cpu(d.v->d_child_subvol);
u32 parent_snapshot;
u32 new_parent_subvol = 0;
u64 parent_inum;
struct printbuf buf = PRINTBUF;
int ret = 0;
ret = subvol_lookup(trans, parent_subvol, &parent_snapshot, &parent_inum);
if (ret && !bch2_err_matches(ret, ENOENT))
return ret;
if (ret ||
(!ret && !bch2_snapshot_is_ancestor(c, parent_snapshot, d.k->p.snapshot))) {
int ret2 = find_snapshot_subvol(trans, d.k->p.snapshot, &new_parent_subvol);
if (ret2 && !bch2_err_matches(ret, ENOENT))
return ret2;
}
if (ret &&
!new_parent_subvol &&
(c->sb.btrees_lost_data & BIT_ULL(BTREE_ID_subvolumes))) {
/*
* Couldn't find a subvol for dirent's snapshot - but we lost
* subvols, so we need to reconstruct:
*/
ret = reconstruct_subvol(trans, d.k->p.snapshot, parent_subvol, 0);
if (ret)
return ret;
parent_snapshot = d.k->p.snapshot;
}
if (fsck_err_on(ret,
trans, dirent_to_missing_parent_subvol,
"dirent parent_subvol points to missing subvolume\n%s",
(bch2_bkey_val_to_text(&buf, c, d.s_c), buf.buf)) ||
fsck_err_on(!ret && !bch2_snapshot_is_ancestor(c, parent_snapshot, d.k->p.snapshot),
trans, dirent_not_visible_in_parent_subvol,
"dirent not visible in parent_subvol (not an ancestor of subvol snap %u)\n%s",
parent_snapshot,
(bch2_bkey_val_to_text(&buf, c, d.s_c), buf.buf))) {
if (!new_parent_subvol) {
bch_err(c, "could not find a subvol for snapshot %u", d.k->p.snapshot);
return -BCH_ERR_fsck_repair_unimplemented;
}
struct bkey_i_dirent *new_dirent = bch2_bkey_make_mut_typed(trans, iter, &d.s_c, 0, dirent);
ret = PTR_ERR_OR_ZERO(new_dirent);
if (ret)
goto err;
new_dirent->v.d_parent_subvol = cpu_to_le32(new_parent_subvol);
}
struct bkey_s_c_subvolume s =
bch2_bkey_get_iter_typed(trans, &subvol_iter,
BTREE_ID_subvolumes, POS(0, target_subvol),
0, subvolume);
ret = bkey_err(s.s_c);
if (ret && !bch2_err_matches(ret, ENOENT))
return ret;
if (ret) {
if (fsck_err(trans, dirent_to_missing_subvol,
"dirent points to missing subvolume\n%s",
(bch2_bkey_val_to_text(&buf, c, d.s_c), buf.buf)))
return __remove_dirent(trans, d.k->p);
ret = 0;
goto out;
}
if (fsck_err_on(le32_to_cpu(s.v->fs_path_parent) != parent_subvol,
trans, subvol_fs_path_parent_wrong,
"subvol with wrong fs_path_parent, should be be %u\n%s",
parent_subvol,
(bch2_bkey_val_to_text(&buf, c, s.s_c), buf.buf))) {
struct bkey_i_subvolume *n =
bch2_bkey_make_mut_typed(trans, &subvol_iter, &s.s_c, 0, subvolume);
ret = PTR_ERR_OR_ZERO(n);
if (ret)
goto err;
n->v.fs_path_parent = cpu_to_le32(parent_subvol);
}
u64 target_inum = le64_to_cpu(s.v->inode);
u32 target_snapshot = le32_to_cpu(s.v->snapshot);
ret = lookup_inode(trans, target_inum, &subvol_root, &target_snapshot);
if (ret && !bch2_err_matches(ret, ENOENT))
goto err;
if (ret) {
bch_err(c, "subvol %u points to missing inode root %llu", target_subvol, target_inum);
ret = -BCH_ERR_fsck_repair_unimplemented;
goto err;
}
if (fsck_err_on(!ret && parent_subvol != subvol_root.bi_parent_subvol,
trans, inode_bi_parent_wrong,
"subvol root %llu has wrong bi_parent_subvol: got %u, should be %u",
target_inum,
subvol_root.bi_parent_subvol, parent_subvol)) {
subvol_root.bi_parent_subvol = parent_subvol;
ret = __bch2_fsck_write_inode(trans, &subvol_root, target_snapshot);
if (ret)
goto err;
}
ret = check_dirent_target(trans, iter, d, &subvol_root,
target_snapshot);
if (ret)
goto err;
out:
err:
fsck_err:
bch2_trans_iter_exit(trans, &subvol_iter);
printbuf_exit(&buf);
return ret;
}
static int check_dirent(struct btree_trans *trans, struct btree_iter *iter,
struct bkey_s_c k,
struct bch_hash_info *hash_info,
struct inode_walker *dir,
struct inode_walker *target,
struct snapshots_seen *s)
{
struct bch_fs *c = trans->c;
struct inode_walker_entry *i;
struct printbuf buf = PRINTBUF;
int ret = 0;
ret = bch2_check_key_has_snapshot(trans, iter, k);
if (ret) {
ret = ret < 0 ? ret : 0;
goto out;
}
ret = snapshots_seen_update(c, s, iter->btree_id, k.k->p);
if (ret)
goto err;
if (k.k->type == KEY_TYPE_whiteout)
goto out;
if (dir->last_pos.inode != k.k->p.inode && dir->have_inodes) {
ret = check_subdir_count(trans, dir);
if (ret)
goto err;
}
i = walk_inode(trans, dir, k);
ret = PTR_ERR_OR_ZERO(i);
if (ret < 0)
goto err;
ret = check_key_has_inode(trans, iter, dir, i, k);
if (ret)
goto err;
if (!i)
goto out;
if (dir->first_this_inode)
*hash_info = bch2_hash_info_init(c, &i->inode);
dir->first_this_inode = false;
ret = hash_check_key(trans, bch2_dirent_hash_desc, hash_info, iter, k);
if (ret < 0)
goto err;
if (ret) {
/* dirent has been deleted */
ret = 0;
goto out;
}
if (k.k->type != KEY_TYPE_dirent)
goto out;
struct bkey_s_c_dirent d = bkey_s_c_to_dirent(k);
if (d.v->d_type == DT_SUBVOL) {
ret = check_dirent_to_subvol(trans, iter, d);
if (ret)
goto err;
} else {
ret = get_visible_inodes(trans, target, s, le64_to_cpu(d.v->d_inum));
if (ret)
goto err;
if (fsck_err_on(!target->inodes.nr,
trans, dirent_to_missing_inode,
"dirent points to missing inode:\n%s",
(printbuf_reset(&buf),
bch2_bkey_val_to_text(&buf, c, k),
buf.buf))) {
ret = __remove_dirent(trans, d.k->p);
if (ret)
goto err;
}
darray_for_each(target->inodes, i) {
ret = check_dirent_target(trans, iter, d,
&i->inode, i->snapshot);
if (ret)
goto err;
}
}
ret = bch2_trans_commit(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc);
if (ret)
goto err;
if (d.v->d_type == DT_DIR)
for_each_visible_inode(c, s, dir, d.k->p.snapshot, i)
i->count++;
out:
err:
fsck_err:
printbuf_exit(&buf);
bch_err_fn(c, ret);
return ret;
}
/*
* Walk dirents: verify that they all have a corresponding S_ISDIR inode,
* validate d_type
*/
int bch2_check_dirents(struct bch_fs *c)
{
struct inode_walker dir = inode_walker_init();
struct inode_walker target = inode_walker_init();
struct snapshots_seen s;
struct bch_hash_info hash_info;
snapshots_seen_init(&s);
int ret = bch2_trans_run(c,
for_each_btree_key(trans, iter, BTREE_ID_dirents,
POS(BCACHEFS_ROOT_INO, 0),
BTREE_ITER_prefetch|BTREE_ITER_all_snapshots, k,
check_dirent(trans, &iter, k, &hash_info, &dir, &target, &s)) ?:
check_subdir_count_notnested(trans, &dir));
snapshots_seen_exit(&s);
inode_walker_exit(&dir);
inode_walker_exit(&target);
bch_err_fn(c, ret);
return ret;
}
static int check_xattr(struct btree_trans *trans, struct btree_iter *iter,
struct bkey_s_c k,
struct bch_hash_info *hash_info,
struct inode_walker *inode)
{
struct bch_fs *c = trans->c;
struct inode_walker_entry *i;
int ret;
ret = bch2_check_key_has_snapshot(trans, iter, k);
if (ret < 0)
return ret;
if (ret)
return 0;
i = walk_inode(trans, inode, k);
ret = PTR_ERR_OR_ZERO(i);
if (ret)
return ret;
ret = check_key_has_inode(trans, iter, inode, i, k);
if (ret)
return ret;
if (!i)
return 0;
if (inode->first_this_inode)
*hash_info = bch2_hash_info_init(c, &i->inode);
inode->first_this_inode = false;
ret = hash_check_key(trans, bch2_xattr_hash_desc, hash_info, iter, k);
bch_err_fn(c, ret);
return ret;
}
/*
* Walk xattrs: verify that they all have a corresponding inode
*/
int bch2_check_xattrs(struct bch_fs *c)
{
struct inode_walker inode = inode_walker_init();
struct bch_hash_info hash_info;
int ret = 0;
ret = bch2_trans_run(c,
for_each_btree_key_commit(trans, iter, BTREE_ID_xattrs,
POS(BCACHEFS_ROOT_INO, 0),
BTREE_ITER_prefetch|BTREE_ITER_all_snapshots,
k,
NULL, NULL,
BCH_TRANS_COMMIT_no_enospc,
check_xattr(trans, &iter, k, &hash_info, &inode)));
inode_walker_exit(&inode);
bch_err_fn(c, ret);
return ret;
}
static int check_root_trans(struct btree_trans *trans)
{
struct bch_fs *c = trans->c;
struct bch_inode_unpacked root_inode;
u32 snapshot;
u64 inum;
int ret;
ret = subvol_lookup(trans, BCACHEFS_ROOT_SUBVOL, &snapshot, &inum);
if (ret && !bch2_err_matches(ret, ENOENT))
return ret;
if (mustfix_fsck_err_on(ret, trans, root_subvol_missing,
"root subvol missing")) {
struct bkey_i_subvolume *root_subvol =
bch2_trans_kmalloc(trans, sizeof(*root_subvol));
ret = PTR_ERR_OR_ZERO(root_subvol);
if (ret)
goto err;
snapshot = U32_MAX;
inum = BCACHEFS_ROOT_INO;
bkey_subvolume_init(&root_subvol->k_i);
root_subvol->k.p.offset = BCACHEFS_ROOT_SUBVOL;
root_subvol->v.flags = 0;
root_subvol->v.snapshot = cpu_to_le32(snapshot);
root_subvol->v.inode = cpu_to_le64(inum);
ret = bch2_btree_insert_trans(trans, BTREE_ID_subvolumes, &root_subvol->k_i, 0);
bch_err_msg(c, ret, "writing root subvol");
if (ret)
goto err;
}
ret = lookup_inode(trans, BCACHEFS_ROOT_INO, &root_inode, &snapshot);
if (ret && !bch2_err_matches(ret, ENOENT))
return ret;
if (mustfix_fsck_err_on(ret,
trans, root_dir_missing,
"root directory missing") ||
mustfix_fsck_err_on(!S_ISDIR(root_inode.bi_mode),
trans, root_inode_not_dir,
"root inode not a directory")) {
bch2_inode_init(c, &root_inode, 0, 0, S_IFDIR|0755,
0, NULL);
root_inode.bi_inum = inum;
ret = __bch2_fsck_write_inode(trans, &root_inode, snapshot);
bch_err_msg(c, ret, "writing root inode");
}
err:
fsck_err:
return ret;
}
/* Get root directory, create if it doesn't exist: */
int bch2_check_root(struct bch_fs *c)
{
int ret = bch2_trans_do(c, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
check_root_trans(trans));
bch_err_fn(c, ret);
return ret;
}
typedef DARRAY(u32) darray_u32;
static bool darray_u32_has(darray_u32 *d, u32 v)
{
darray_for_each(*d, i)
if (*i == v)
return true;
return false;
}
static int check_subvol_path(struct btree_trans *trans, struct btree_iter *iter, struct bkey_s_c k)
{
struct bch_fs *c = trans->c;
struct btree_iter parent_iter = {};
darray_u32 subvol_path = {};
struct printbuf buf = PRINTBUF;
int ret = 0;
if (k.k->type != KEY_TYPE_subvolume)
return 0;
while (k.k->p.offset != BCACHEFS_ROOT_SUBVOL) {
ret = darray_push(&subvol_path, k.k->p.offset);
if (ret)
goto err;
struct bkey_s_c_subvolume s = bkey_s_c_to_subvolume(k);
struct bch_inode_unpacked subvol_root;
ret = bch2_inode_find_by_inum_trans(trans,
(subvol_inum) { s.k->p.offset, le64_to_cpu(s.v->inode) },
&subvol_root);
if (ret)
break;
/*
* We've checked that inode backpointers point to valid dirents;
* here, it's sufficient to check that the subvolume root has a
* dirent:
*/
if (fsck_err_on(!subvol_root.bi_dir,
trans, subvol_unreachable,
"unreachable subvolume %s",
(bch2_bkey_val_to_text(&buf, c, s.s_c),
prt_newline(&buf),
bch2_inode_unpacked_to_text(&buf, &subvol_root),
buf.buf))) {
ret = reattach_subvol(trans, s);
break;
}
u32 parent = le32_to_cpu(s.v->fs_path_parent);
if (darray_u32_has(&subvol_path, parent)) {
if (fsck_err(c, subvol_loop, "subvolume loop"))
ret = reattach_subvol(trans, s);
break;
}
bch2_trans_iter_exit(trans, &parent_iter);
bch2_trans_iter_init(trans, &parent_iter,
BTREE_ID_subvolumes, POS(0, parent), 0);
k = bch2_btree_iter_peek_slot(&parent_iter);
ret = bkey_err(k);
if (ret)
goto err;
if (fsck_err_on(k.k->type != KEY_TYPE_subvolume,
trans, subvol_unreachable,
"unreachable subvolume %s",
(bch2_bkey_val_to_text(&buf, c, s.s_c),
buf.buf))) {
ret = reattach_subvol(trans, s);
break;
}
}
fsck_err:
err:
printbuf_exit(&buf);
darray_exit(&subvol_path);
bch2_trans_iter_exit(trans, &parent_iter);
return ret;
}
int bch2_check_subvolume_structure(struct bch_fs *c)
{
int ret = bch2_trans_run(c,
for_each_btree_key_commit(trans, iter,
BTREE_ID_subvolumes, POS_MIN, BTREE_ITER_prefetch, k,
NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
check_subvol_path(trans, &iter, k)));
bch_err_fn(c, ret);
return ret;
}
struct pathbuf_entry {
u64 inum;
u32 snapshot;
};
typedef DARRAY(struct pathbuf_entry) pathbuf;
static bool path_is_dup(pathbuf *p, u64 inum, u32 snapshot)
{
darray_for_each(*p, i)
if (i->inum == inum &&
i->snapshot == snapshot)
return true;
return false;
}
/*
* Check that a given inode is reachable from its subvolume root - we already
* verified subvolume connectivity:
*
* XXX: we should also be verifying that inodes are in the right subvolumes
*/
static int check_path(struct btree_trans *trans, pathbuf *p, struct bkey_s_c inode_k)
{
struct bch_fs *c = trans->c;
struct btree_iter inode_iter = {};
struct bch_inode_unpacked inode;
struct printbuf buf = PRINTBUF;
u32 snapshot = inode_k.k->p.snapshot;
int ret = 0;
p->nr = 0;
BUG_ON(bch2_inode_unpack(inode_k, &inode));
while (!inode.bi_subvol) {
struct btree_iter dirent_iter;
struct bkey_s_c_dirent d;
u32 parent_snapshot = snapshot;
d = inode_get_dirent(trans, &dirent_iter, &inode, &parent_snapshot);
ret = bkey_err(d.s_c);
if (ret && !bch2_err_matches(ret, ENOENT))
break;
if (!ret && (ret = dirent_points_to_inode(c, d, &inode)))
bch2_trans_iter_exit(trans, &dirent_iter);
if (bch2_err_matches(ret, ENOENT)) {
ret = 0;
if (fsck_err(trans, inode_unreachable,
"unreachable inode\n%s",
(printbuf_reset(&buf),
bch2_bkey_val_to_text(&buf, c, inode_k),
buf.buf)))
ret = reattach_inode(trans, &inode, snapshot);
goto out;
}
bch2_trans_iter_exit(trans, &dirent_iter);
if (!S_ISDIR(inode.bi_mode))
break;
ret = darray_push(p, ((struct pathbuf_entry) {
.inum = inode.bi_inum,
.snapshot = snapshot,
}));
if (ret)
return ret;
snapshot = parent_snapshot;
bch2_trans_iter_exit(trans, &inode_iter);
inode_k = bch2_bkey_get_iter(trans, &inode_iter, BTREE_ID_inodes,
SPOS(0, inode.bi_dir, snapshot), 0);
ret = bkey_err(inode_k) ?:
!bkey_is_inode(inode_k.k) ? -BCH_ERR_ENOENT_inode
: bch2_inode_unpack(inode_k, &inode);
if (ret) {
/* Should have been caught in dirents pass */
bch_err_msg(c, ret, "error looking up parent directory");
break;
}
snapshot = inode_k.k->p.snapshot;
if (path_is_dup(p, inode.bi_inum, snapshot)) {
/* XXX print path */
bch_err(c, "directory structure loop");
darray_for_each(*p, i)
pr_err("%llu:%u", i->inum, i->snapshot);
pr_err("%llu:%u", inode.bi_inum, snapshot);
if (fsck_err(trans, dir_loop, "directory structure loop")) {
ret = remove_backpointer(trans, &inode);
bch_err_msg(c, ret, "removing dirent");
if (ret)
break;
ret = reattach_inode(trans, &inode, snapshot);
bch_err_msg(c, ret, "reattaching inode %llu", inode.bi_inum);
}
break;
}
}
out:
fsck_err:
bch2_trans_iter_exit(trans, &inode_iter);
printbuf_exit(&buf);
bch_err_fn(c, ret);
return ret;
}
/*
* Check for unreachable inodes, as well as loops in the directory structure:
* After bch2_check_dirents(), if an inode backpointer doesn't exist that means it's
* unreachable:
*/
int bch2_check_directory_structure(struct bch_fs *c)
{
pathbuf path = { 0, };
int ret;
ret = bch2_trans_run(c,
for_each_btree_key_commit(trans, iter, BTREE_ID_inodes, POS_MIN,
BTREE_ITER_intent|
BTREE_ITER_prefetch|
BTREE_ITER_all_snapshots, k,
NULL, NULL, BCH_TRANS_COMMIT_no_enospc, ({
if (!bkey_is_inode(k.k))
continue;
if (bch2_inode_flags(k) & BCH_INODE_unlinked)
continue;
check_path(trans, &path, k);
})));
darray_exit(&path);
bch_err_fn(c, ret);
return ret;
}
struct nlink_table {
size_t nr;
size_t size;
struct nlink {
u64 inum;
u32 snapshot;
u32 count;
} *d;
};
static int add_nlink(struct bch_fs *c, struct nlink_table *t,
u64 inum, u32 snapshot)
{
if (t->nr == t->size) {
size_t new_size = max_t(size_t, 128UL, t->size * 2);
void *d = kvmalloc_array(new_size, sizeof(t->d[0]), GFP_KERNEL);
if (!d) {
bch_err(c, "fsck: error allocating memory for nlink_table, size %zu",
new_size);
return -BCH_ERR_ENOMEM_fsck_add_nlink;
}
if (t->d)
memcpy(d, t->d, t->size * sizeof(t->d[0]));
kvfree(t->d);
t->d = d;
t->size = new_size;
}
t->d[t->nr++] = (struct nlink) {
.inum = inum,
.snapshot = snapshot,
};
return 0;
}
static int nlink_cmp(const void *_l, const void *_r)
{
const struct nlink *l = _l;
const struct nlink *r = _r;
return cmp_int(l->inum, r->inum);
}
static void inc_link(struct bch_fs *c, struct snapshots_seen *s,
struct nlink_table *links,
u64 range_start, u64 range_end, u64 inum, u32 snapshot)
{
struct nlink *link, key = {
.inum = inum, .snapshot = U32_MAX,
};
if (inum < range_start || inum >= range_end)
return;
link = __inline_bsearch(&key, links->d, links->nr,
sizeof(links->d[0]), nlink_cmp);
if (!link)
return;
while (link > links->d && link[0].inum == link[-1].inum)
--link;
for (; link < links->d + links->nr && link->inum == inum; link++)
if (ref_visible(c, s, snapshot, link->snapshot)) {
link->count++;
if (link->snapshot >= snapshot)
break;
}
}
noinline_for_stack
static int check_nlinks_find_hardlinks(struct bch_fs *c,
struct nlink_table *t,
u64 start, u64 *end)
{
int ret = bch2_trans_run(c,
for_each_btree_key(trans, iter, BTREE_ID_inodes,
POS(0, start),
BTREE_ITER_intent|
BTREE_ITER_prefetch|
BTREE_ITER_all_snapshots, k, ({
if (!bkey_is_inode(k.k))
continue;
/* Should never fail, checked by bch2_inode_invalid: */
struct bch_inode_unpacked u;
BUG_ON(bch2_inode_unpack(k, &u));
/*
* Backpointer and directory structure checks are sufficient for
* directories, since they can't have hardlinks:
*/
if (S_ISDIR(u.bi_mode))
continue;
if (!u.bi_nlink)
continue;
ret = add_nlink(c, t, k.k->p.offset, k.k->p.snapshot);
if (ret) {
*end = k.k->p.offset;
ret = 0;
break;
}
0;
})));
bch_err_fn(c, ret);
return ret;
}
noinline_for_stack
static int check_nlinks_walk_dirents(struct bch_fs *c, struct nlink_table *links,
u64 range_start, u64 range_end)
{
struct snapshots_seen s;
snapshots_seen_init(&s);
int ret = bch2_trans_run(c,
for_each_btree_key(trans, iter, BTREE_ID_dirents, POS_MIN,
BTREE_ITER_intent|
BTREE_ITER_prefetch|
BTREE_ITER_all_snapshots, k, ({
ret = snapshots_seen_update(c, &s, iter.btree_id, k.k->p);
if (ret)
break;
if (k.k->type == KEY_TYPE_dirent) {
struct bkey_s_c_dirent d = bkey_s_c_to_dirent(k);
if (d.v->d_type != DT_DIR &&
d.v->d_type != DT_SUBVOL)
inc_link(c, &s, links, range_start, range_end,
le64_to_cpu(d.v->d_inum), d.k->p.snapshot);
}
0;
})));
snapshots_seen_exit(&s);
bch_err_fn(c, ret);
return ret;
}
static int check_nlinks_update_inode(struct btree_trans *trans, struct btree_iter *iter,
struct bkey_s_c k,
struct nlink_table *links,
size_t *idx, u64 range_end)
{
struct bch_inode_unpacked u;
struct nlink *link = &links->d[*idx];
int ret = 0;
if (k.k->p.offset >= range_end)
return 1;
if (!bkey_is_inode(k.k))
return 0;
BUG_ON(bch2_inode_unpack(k, &u));
if (S_ISDIR(u.bi_mode))
return 0;
if (!u.bi_nlink)
return 0;
while ((cmp_int(link->inum, k.k->p.offset) ?:
cmp_int(link->snapshot, k.k->p.snapshot)) < 0) {
BUG_ON(*idx == links->nr);
link = &links->d[++*idx];
}
if (fsck_err_on(bch2_inode_nlink_get(&u) != link->count,
trans, inode_wrong_nlink,
"inode %llu type %s has wrong i_nlink (%u, should be %u)",
u.bi_inum, bch2_d_types[mode_to_type(u.bi_mode)],
bch2_inode_nlink_get(&u), link->count)) {
bch2_inode_nlink_set(&u, link->count);
ret = __bch2_fsck_write_inode(trans, &u, k.k->p.snapshot);
}
fsck_err:
return ret;
}
noinline_for_stack
static int check_nlinks_update_hardlinks(struct bch_fs *c,
struct nlink_table *links,
u64 range_start, u64 range_end)
{
size_t idx = 0;
int ret = bch2_trans_run(c,
for_each_btree_key_commit(trans, iter, BTREE_ID_inodes,
POS(0, range_start),
BTREE_ITER_intent|BTREE_ITER_prefetch|BTREE_ITER_all_snapshots, k,
NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
check_nlinks_update_inode(trans, &iter, k, links, &idx, range_end)));
if (ret < 0) {
bch_err(c, "error in fsck walking inodes: %s", bch2_err_str(ret));
return ret;
}
return 0;
}
int bch2_check_nlinks(struct bch_fs *c)
{
struct nlink_table links = { 0 };
u64 this_iter_range_start, next_iter_range_start = 0;
int ret = 0;
do {
this_iter_range_start = next_iter_range_start;
next_iter_range_start = U64_MAX;
ret = check_nlinks_find_hardlinks(c, &links,
this_iter_range_start,
&next_iter_range_start);
ret = check_nlinks_walk_dirents(c, &links,
this_iter_range_start,
next_iter_range_start);
if (ret)
break;
ret = check_nlinks_update_hardlinks(c, &links,
this_iter_range_start,
next_iter_range_start);
if (ret)
break;
links.nr = 0;
} while (next_iter_range_start != U64_MAX);
kvfree(links.d);
bch_err_fn(c, ret);
return ret;
}
static int fix_reflink_p_key(struct btree_trans *trans, struct btree_iter *iter,
struct bkey_s_c k)
{
struct bkey_s_c_reflink_p p;
struct bkey_i_reflink_p *u;
if (k.k->type != KEY_TYPE_reflink_p)
return 0;
p = bkey_s_c_to_reflink_p(k);
if (!p.v->front_pad && !p.v->back_pad)
return 0;
u = bch2_trans_kmalloc(trans, sizeof(*u));
int ret = PTR_ERR_OR_ZERO(u);
if (ret)
return ret;
bkey_reassemble(&u->k_i, k);
u->v.front_pad = 0;
u->v.back_pad = 0;
return bch2_trans_update(trans, iter, &u->k_i, BTREE_TRIGGER_norun);
}
int bch2_fix_reflink_p(struct bch_fs *c)
{
if (c->sb.version >= bcachefs_metadata_version_reflink_p_fix)
return 0;
int ret = bch2_trans_run(c,
for_each_btree_key_commit(trans, iter,
BTREE_ID_extents, POS_MIN,
BTREE_ITER_intent|BTREE_ITER_prefetch|
BTREE_ITER_all_snapshots, k,
NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
fix_reflink_p_key(trans, &iter, k)));
bch_err_fn(c, ret);
return ret;
}
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