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-rw-r--r--c_src/libbcachefs/fsck.c2394
1 files changed, 0 insertions, 2394 deletions
diff --git a/c_src/libbcachefs/fsck.c b/c_src/libbcachefs/fsck.c
deleted file mode 100644
index 4f0ecd60..00000000
--- a/c_src/libbcachefs/fsck.c
+++ /dev/null
@@ -1,2394 +0,0 @@
-// 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-common.h"
-#include "fsck.h"
-#include "inode.h"
-#include "keylist.h"
-#include "recovery.h"
-#include "snapshot.h"
-#include "super.h"
-#include "xattr.h"
-
-#include <linux/bsearch.h>
-#include <linux/dcache.h> /* struct qstr */
-
-/*
- * 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;
-
- 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;
-
- bch2_trans_iter_init(trans, &iter, BTREE_ID_inodes,
- POS(0, inode_nr),
- BTREE_ITER_ALL_SNAPSHOTS);
- k = bch2_btree_iter_peek(&iter);
- ret = bkey_err(k);
- if (ret)
- goto err;
-
- if (!k.k || !bkey_eq(k.k->p, POS(0, inode_nr))) {
- ret = -BCH_ERR_ENOENT_inode;
- goto err;
- }
-
- ret = bch2_inode_unpack(k, inode);
-err:
- 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:
- bch_err_msg(trans->c, ret, "fetching inode %llu:%u", inode_nr, *snapshot);
- bch2_trans_iter_exit(trans, &iter);
- return ret;
-}
-
-static int __lookup_dirent(struct btree_trans *trans,
- struct bch_hash_info hash_info,
- subvol_inum dir, struct qstr *name,
- u64 *target, unsigned *type)
-{
- struct btree_iter iter;
- struct bkey_s_c_dirent d;
- int ret;
-
- ret = bch2_hash_lookup(trans, &iter, bch2_dirent_hash_desc,
- &hash_info, dir, name, 0);
- if (ret)
- return ret;
-
- 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 __write_inode(struct btree_trans *trans,
- struct bch_inode_unpacked *inode,
- u32 snapshot)
-{
- struct bkey_inode_buf *inode_p =
- bch2_trans_kmalloc(trans, sizeof(*inode_p));
-
- if (IS_ERR(inode_p))
- return PTR_ERR(inode_p);
-
- bch2_inode_pack(inode_p, inode);
- inode_p->inode.k.p.snapshot = snapshot;
-
- return bch2_btree_insert_nonextent(trans, BTREE_ID_inodes,
- &inode_p->inode.k_i,
- BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE);
-}
-
-static int fsck_write_inode(struct btree_trans *trans,
- struct bch_inode_unpacked *inode,
- u32 snapshot)
-{
- int ret = commit_do(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc,
- __write_inode(trans, inode, snapshot));
- bch_err_fn(trans->c, ret);
- return ret;
-}
-
-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_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)
-{
- 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) };
- u32 subvol_snapshot;
-
- ret = subvol_lookup(trans, le32_to_cpu(st.master_subvol),
- &subvol_snapshot, &root_inum.inum);
- bch_err_msg(c, ret, "looking up root subvol");
- if (ret)
- return ret;
-
- struct bch_inode_unpacked root_inode;
- struct bch_hash_info root_hash_info;
- ret = lookup_inode(trans, root_inum.inum, &root_inode, &snapshot);
- bch_err_msg(c, ret, "looking up root inode");
- if (ret)
- return ret;
-
- root_hash_info = bch2_hash_info_init(c, &root_inode);
-
- ret = __lookup_dirent(trans, root_hash_info, root_inum,
- &lostfound_str, &inum, &d_type);
- 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:
- */
- return lookup_inode(trans, inum, lostfound, &snapshot);
-
-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,
- root_inode.bi_inum, snapshot, &root_hash_info,
- mode_to_type(lostfound->bi_mode),
- &lostfound_str,
- lostfound->bi_inum,
- &lostfound->bi_dir_offset,
- BCH_HASH_SET_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_hash_info dir_hash;
- struct bch_inode_unpacked lostfound;
- char name_buf[20];
- struct qstr name;
- u64 dir_offset = 0;
- int ret;
-
- ret = lookup_lostfound(trans, inode_snapshot, &lostfound);
- if (ret)
- return ret;
-
- if (S_ISDIR(inode->bi_mode)) {
- lostfound.bi_nlink++;
-
- ret = __write_inode(trans, &lostfound, U32_MAX);
- if (ret)
- return ret;
- }
-
- dir_hash = bch2_hash_info_init(trans->c, &lostfound);
-
- snprintf(name_buf, sizeof(name_buf), "%llu", inode->bi_inum);
- name = (struct qstr) QSTR(name_buf);
-
- ret = bch2_dirent_create_snapshot(trans,
- lostfound.bi_inum, inode_snapshot,
- &dir_hash,
- inode_d_type(inode),
- &name, inode->bi_inum, &dir_offset,
- BCH_HASH_SET_MUST_CREATE);
- if (ret)
- return ret;
-
- inode->bi_dir = lostfound.bi_inum;
- inode->bi_dir_offset = dir_offset;
-
- return __write_inode(trans, inode, inode_snapshot);
-}
-
-static int remove_backpointer(struct btree_trans *trans,
- struct bch_inode_unpacked *inode)
-{
- struct btree_iter iter;
- struct bkey_s_c_dirent d;
- int ret;
-
- d = bch2_bkey_get_iter_typed(trans, &iter, BTREE_ID_dirents,
- POS(inode->bi_dir, inode->bi_dir_offset), 0,
- dirent);
- ret = bkey_err(d) ?:
- __remove_dirent(trans, d.k->p);
- bch2_trans_iter_exit(trans, &iter);
- return ret;
-}
-
-struct snapshots_seen_entry {
- u32 id;
- u32 equiv;
-};
-
-struct snapshots_seen {
- struct bpos pos;
- DARRAY(struct snapshots_seen_entry) 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)
-{
- struct snapshots_seen_entry *i, n = {
- .id = id,
- .equiv = bch2_snapshot_equiv(c, id),
- };
- int ret = 0;
-
- __darray_for_each(s->ids, i) {
- if (i->id == id)
- return 0;
- if (i->id > id)
- break;
- }
-
- ret = darray_insert_item(&s->ids, i - s->ids.data, n);
- 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)
-{
- struct snapshots_seen_entry n = {
- .id = pos.snapshot,
- .equiv = bch2_snapshot_equiv(c, pos.snapshot),
- };
- int ret = 0;
-
- if (!bkey_eq(s->pos, pos))
- s->ids.nr = 0;
-
- s->pos = pos;
- s->pos.snapshot = n.equiv;
-
- darray_for_each(s->ids, i) {
- if (i->id == n.id)
- return 0;
-
- /*
- * We currently don't rigorously track for snapshot cleanup
- * needing to be run, so it shouldn't be a fsck error yet:
- */
- if (i->equiv == n.equiv) {
- bch_err(c, "snapshot deletion did not finish:\n"
- " duplicate keys in btree %s at %llu:%llu snapshots %u, %u (equiv %u)\n",
- bch2_btree_id_str(btree_id),
- pos.inode, pos.offset,
- i->id, n.id, n.equiv);
- set_bit(BCH_FS_need_delete_dead_snapshots, &c->flags);
- return bch2_run_explicit_recovery_pass(c, BCH_RECOVERY_PASS_delete_dead_snapshots);
- }
- }
-
- ret = darray_push(&s->ids, n);
- if (ret)
- bch_err(c, "error reallocating snapshots_seen table (size %zu)",
- s->ids.size);
- return ret;
-}
-
-/**
- * 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);
- EBUG_ON(!bch2_snapshot_is_equiv(c, id));
- EBUG_ON(!bch2_snapshot_is_equiv(c, ancestor));
-
- /* @ancestor should be the snapshot most recently added to @seen */
- EBUG_ON(ancestor != seen->pos.snapshot);
- EBUG_ON(ancestor != seen->ids.data[seen->ids.nr - 1].equiv);
-
- 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].equiv >= id;
- --i)
- if (bch2_snapshot_is_ancestor(c, id, seen->ids.data[i].equiv))
- 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)
-{
- src = bch2_snapshot_equiv(c, src);
- dst = bch2_snapshot_equiv(c, dst);
-
- 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;
- bool seen_this_pos;
- u64 count;
-};
-
-struct inode_walker {
- bool first_this_inode;
- 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 = bch2_snapshot_equiv(c, 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;
-
- 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;
- return 0;
-}
-
-static struct inode_walker_entry *
-lookup_inode_for_snapshot(struct bch_fs *c, struct inode_walker *w,
- u32 snapshot, bool is_whiteout)
-{
- struct inode_walker_entry *i;
-
- snapshot = bch2_snapshot_equiv(c, snapshot);
-
- __darray_for_each(w->inodes, i)
- if (bch2_snapshot_is_ancestor(c, snapshot, i->snapshot))
- goto found;
-
- return NULL;
-found:
- BUG_ON(snapshot > i->snapshot);
-
- if (snapshot != i->snapshot && !is_whiteout) {
- struct inode_walker_entry new = *i;
- size_t pos;
- int ret;
-
- new.snapshot = snapshot;
- new.count = 0;
-
- bch_info(c, "have key for inode %llu:%u but have inode in ancestor snapshot %u",
- w->last_pos.inode, snapshot, i->snapshot);
-
- while (i > w->inodes.data && i[-1].snapshot > snapshot)
- --i;
-
- pos = i - w->inodes.data;
- 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 bpos pos,
- bool is_whiteout)
-{
- if (w->last_pos.inode != pos.inode) {
- int ret = get_inodes_all_snapshots(trans, w, pos.inode);
- if (ret)
- return ERR_PTR(ret);
- } else if (bkey_cmp(w->last_pos, pos)) {
- darray_for_each(w->inodes, i)
- i->seen_this_pos = false;
- }
-
- w->last_pos = pos;
-
- return lookup_inode_for_snapshot(trans->c, w, pos.snapshot, is_whiteout);
-}
-
-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) {
- u32 equiv = bch2_snapshot_equiv(c, k.k->p.snapshot);
-
- if (k.k->p.offset != inum)
- break;
-
- if (!ref_visible(c, s, s->pos.snapshot, equiv))
- continue;
-
- if (bkey_is_inode(k.k))
- add_inode(c, w, k);
-
- if (equiv >= s->pos.snapshot)
- break;
- }
- bch2_trans_iter_exit(trans, &iter);
-
- return ret;
-}
-
-static int check_key_has_snapshot(struct btree_trans *trans,
- struct btree_iter *iter,
- struct bkey_s_c k)
-{
- struct bch_fs *c = trans->c;
- struct printbuf buf = PRINTBUF;
- int ret = 0;
-
- if (mustfix_fsck_err_on(!bch2_snapshot_equiv(c, k.k->p.snapshot), c,
- bkey_in_missing_snapshot,
- "key in missing snapshot: %s",
- (bch2_bkey_val_to_text(&buf, c, k), buf.buf)))
- ret = bch2_btree_delete_at(trans, iter,
- BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE) ?: 1;
-fsck_err:
- printbuf_exit(&buf);
- 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_snapshot(trans, desc, hash_info,
- (subvol_inum) { 0, k.k->p.inode },
- k.k->p.snapshot, tmp,
- BCH_HASH_SET_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), c,
- 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(c, 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 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);
- if (ret)
- return ret;
-
- bch2_trans_iter_exit(trans, &iter);
- return k.k->type == KEY_TYPE_set;
-}
-
-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 = 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),
- c, 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 = __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) {
- ret = check_inode_deleted_list(trans, k.k->p);
- if (ret < 0)
- return ret;
-
- fsck_err_on(ret, c, unlinked_inode_not_on_deleted_list,
- "inode %llu:%u unlinked, but not on deleted list",
- u.bi_inum, k.k->p.snapshot);
- ret = 0;
- }
-
- if (u.bi_flags & BCH_INODE_unlinked &&
- (!c->sb.clean ||
- fsck_err(c, inode_unlinked_but_clean,
- "filesystem marked clean, but inode %llu unlinked",
- u.bi_inum))) {
- ret = bch2_inode_rm_snapshot(trans, u.bi_inum, iter->pos.snapshot);
- bch_err_msg(c, ret, "in fsck deleting inode");
- return ret;
- }
-
- if (u.bi_flags & BCH_INODE_i_size_dirty &&
- (!c->sb.clean ||
- fsck_err(c, 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;
- }
-
- if (u.bi_flags & BCH_INODE_i_sectors_dirty &&
- (!c->sb.clean ||
- fsck_err(c, 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 (do_update) {
- ret = __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 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 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(struct bkey_s_c_dirent d,
- struct bch_inode_unpacked *inode)
-{
- return 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;
-}
-
-static int check_i_sectors(struct btree_trans *trans, struct inode_walker *w)
-{
- struct bch_fs *c = trans->c;
- u32 restart_count = trans->restart_count;
- 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(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),
- c, 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 = fsck_write_inode(trans, &i->inode, i->snapshot);
- if (ret)
- break;
- }
- }
-fsck_err:
- bch_err_fn(c, ret);
- return ret ?: 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(c, 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,
- u32 equiv,
- 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;
- }
-
- ret = extent_ends_at(c, extent_ends, seen, k);
- 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 bch_fs *c = trans->c;
- struct inode_walker_entry *i;
- struct printbuf buf = PRINTBUF;
- struct bpos equiv = k.k->p;
- int ret = 0;
-
- equiv.snapshot = bch2_snapshot_equiv(c, k.k->p.snapshot);
-
- ret = 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) {
- ret = check_i_sectors(trans, inode);
- if (ret)
- goto err;
- }
-
- i = walk_inode(trans, inode, equiv, k.k->type == KEY_TYPE_whiteout);
- ret = PTR_ERR_OR_ZERO(i);
- if (ret)
- goto err;
-
- ret = snapshots_seen_update(c, s, iter->btree_id, k.k->p);
- if (ret)
- goto err;
-
- if (k.k->type != KEY_TYPE_whiteout) {
- if (fsck_err_on(!i, c, extent_in_missing_inode,
- "extent 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 &&
- !S_ISREG(i->inode.bi_mode) &&
- !S_ISLNK(i->inode.bi_mode),
- c, extent_in_non_reg_inode,
- "extent in non regular inode mode %o:\n %s",
- i->inode.bi_mode,
- (printbuf_reset(&buf),
- bch2_bkey_val_to_text(&buf, c, k), buf.buf)))
- goto delete;
-
- ret = check_overlapping_extents(trans, s, extent_ends, k,
- equiv.snapshot, 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:
- */
- if (!i)
- i = inode->inodes.data + inode->inodes.nr - 1;
-
- for (;
- inode->inodes.data && i >= inode->inodes.data;
- --i) {
- if (i->snapshot > equiv.snapshot ||
- !key_visible_in_snapshot(c, s, i->snapshot, equiv.snapshot))
- continue;
-
- if (k.k->type != KEY_TYPE_whiteout) {
- 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),
- c, 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;
- }
-
- if (bkey_extent_is_allocation(k.k))
- i->count += k.k->size;
- }
-
- i->seen_this_pos = true;
- }
-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;
-}
-
-/*
- * 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_commit(trans, iter, BTREE_ID_extents,
- POS(BCACHEFS_ROOT_INO, 0),
- BTREE_ITER_PREFETCH|BTREE_ITER_ALL_SNAPSHOTS, k,
- &res, NULL,
- BCH_TRANS_COMMIT_no_enospc, ({
- bch2_disk_reservation_put(c, &res);
- check_extent(trans, &iter, k, &w, &s, &extent_ends) ?:
- check_extent_overbig(trans, &iter, k);
- })) ?:
- check_i_sectors(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(struct btree_trans *trans, struct inode_walker *w)
-{
- struct bch_fs *c = trans->c;
- u32 restart_count = trans->restart_count;
- 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(c, "fsck counted subdirectories wrong: got %llu should be %llu",
- i->count, count2);
- i->count = count2;
- if (i->inode.bi_nlink == i->count)
- continue;
- }
-
- if (fsck_err_on(i->inode.bi_nlink != i->count,
- c, 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 = fsck_write_inode(trans, &i->inode, i->snapshot);
- if (ret)
- break;
- }
- }
-fsck_err:
- bch_err_fn(c, ret);
- return ret ?: trans_was_restarted(trans, restart_count);
-}
-
-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;
- struct btree_iter bp_iter = { NULL };
- int ret = 0;
-
- if (!target->bi_dir &&
- !target->bi_dir_offset) {
- target->bi_dir = d.k->p.inode;
- target->bi_dir_offset = d.k->p.offset;
-
- ret = __write_inode(trans, target, target_snapshot);
- if (ret)
- goto err;
- }
-
- if (!inode_points_to_dirent(target, d)) {
- 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;
-
- 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(S_ISDIR(target->bi_mode) && backpointer_exists,
- c, inode_dir_multiple_links,
- "directory %llu:%u with multiple links\n%s",
- 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,
- c, 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 = __write_inode(trans, target, target_snapshot);
- if (ret)
- goto err;
- }
-
- if (fsck_err_on(!backpointer_exists,
- c, 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 = __write_inode(trans, target, target_snapshot);
- if (ret)
- goto err;
- }
- }
-
- if (fsck_err_on(d.v->d_type != inode_d_type(target),
- c, 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);
-
- ret = bch2_trans_update(trans, iter, &n->k_i, 0);
- if (ret)
- goto err;
-
- d = dirent_i_to_s_c(n);
- }
-
- if (fsck_err_on(d.v->d_type == DT_SUBVOL &&
- target->bi_parent_subvol != le32_to_cpu(d.v->d_parent_subvol),
- c, dirent_d_parent_subvol_wrong,
- "dirent has wrong d_parent_subvol field: got %u, should be %u",
- le32_to_cpu(d.v->d_parent_subvol),
- target->bi_parent_subvol)) {
- 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_parent_subvol = cpu_to_le32(target->bi_parent_subvol);
-
- ret = bch2_trans_update(trans, iter, &n->k_i, 0);
- if (ret)
- goto err;
-
- d = dirent_i_to_s_c(n);
- }
-out:
-err:
-fsck_err:
- bch2_trans_iter_exit(trans, &bp_iter);
- printbuf_exit(&buf);
- bch_err_fn(c, ret);
- 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 bkey_s_c_dirent d;
- struct inode_walker_entry *i;
- struct printbuf buf = PRINTBUF;
- struct bpos equiv;
- int ret = 0;
-
- ret = check_key_has_snapshot(trans, iter, k);
- if (ret) {
- ret = ret < 0 ? ret : 0;
- goto out;
- }
-
- equiv = k.k->p;
- equiv.snapshot = bch2_snapshot_equiv(c, k.k->p.snapshot);
-
- 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) {
- ret = check_subdir_count(trans, dir);
- if (ret)
- goto err;
- }
-
- BUG_ON(!btree_iter_path(trans, iter)->should_be_locked);
-
- i = walk_inode(trans, dir, equiv, k.k->type == KEY_TYPE_whiteout);
- ret = PTR_ERR_OR_ZERO(i);
- if (ret < 0)
- goto err;
-
- if (dir->first_this_inode && dir->inodes.nr)
- *hash_info = bch2_hash_info_init(c, &dir->inodes.data[0].inode);
- dir->first_this_inode = false;
-
- if (fsck_err_on(!i, c, dirent_in_missing_dir_inode,
- "dirent in nonexisting directory:\n%s",
- (printbuf_reset(&buf),
- bch2_bkey_val_to_text(&buf, c, k), buf.buf))) {
- ret = bch2_btree_delete_at(trans, iter,
- BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE);
- goto out;
- }
-
- if (!i)
- goto out;
-
- if (fsck_err_on(!S_ISDIR(i->inode.bi_mode),
- c, dirent_in_non_dir_inode,
- "dirent in non directory inode type %s:\n%s",
- bch2_d_type_str(inode_d_type(&i->inode)),
- (printbuf_reset(&buf),
- bch2_bkey_val_to_text(&buf, c, k), buf.buf))) {
- ret = bch2_btree_delete_at(trans, iter, 0);
- goto out;
- }
-
- 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;
-
- d = bkey_s_c_to_dirent(k);
-
- if (d.v->d_type == DT_SUBVOL) {
- struct bch_inode_unpacked subvol_root;
- u32 target_subvol = le32_to_cpu(d.v->d_child_subvol);
- u32 target_snapshot;
- u64 target_inum;
-
- ret = subvol_lookup(trans, target_subvol,
- &target_snapshot, &target_inum);
- if (ret && !bch2_err_matches(ret, ENOENT))
- goto err;
-
- if (fsck_err_on(ret, c, dirent_to_missing_subvol,
- "dirent points to missing subvolume %u",
- le32_to_cpu(d.v->d_child_subvol))) {
- ret = __remove_dirent(trans, d.k->p);
- goto err;
- }
-
- ret = lookup_inode(trans, target_inum,
- &subvol_root, &target_snapshot);
- if (ret && !bch2_err_matches(ret, ENOENT))
- goto err;
-
- if (fsck_err_on(ret, c, subvol_to_missing_root,
- "subvolume %u points to missing subvolume root %llu",
- target_subvol,
- target_inum)) {
- bch_err(c, "repair not implemented yet");
- ret = -EINVAL;
- goto err;
- }
-
- if (fsck_err_on(subvol_root.bi_subvol != target_subvol,
- c, subvol_root_wrong_bi_subvol,
- "subvol root %llu has wrong bi_subvol field: got %u, should be %u",
- target_inum,
- subvol_root.bi_subvol, target_subvol)) {
- subvol_root.bi_subvol = target_subvol;
- ret = __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;
- } 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,
- c, dirent_to_missing_inode,
- "dirent points to missing inode: (equiv %u)\n%s",
- equiv.snapshot,
- (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;
- }
- }
-
- if (d.v->d_type == DT_DIR)
- for_each_visible_inode(c, s, dir, equiv.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_commit(trans, iter, BTREE_ID_dirents,
- POS(BCACHEFS_ROOT_INO, 0),
- BTREE_ITER_PREFETCH|BTREE_ITER_ALL_SNAPSHOTS,
- k,
- NULL, NULL,
- BCH_TRANS_COMMIT_no_enospc,
- check_dirent(trans, &iter, k, &hash_info, &dir, &target, &s)));
-
- 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 = check_key_has_snapshot(trans, iter, k);
- if (ret)
- return ret;
-
- i = walk_inode(trans, inode, k.k->p, k.k->type == KEY_TYPE_whiteout);
- ret = PTR_ERR_OR_ZERO(i);
- if (ret)
- return ret;
-
- if (inode->first_this_inode && inode->inodes.nr)
- *hash_info = bch2_hash_info_init(c, &inode->inodes.data[0].inode);
- inode->first_this_inode = false;
-
- if (fsck_err_on(!i, c, xattr_in_missing_inode,
- "xattr for missing inode %llu",
- k.k->p.inode))
- return bch2_btree_delete_at(trans, iter, 0);
-
- if (!i)
- return 0;
-
- ret = hash_check_key(trans, bch2_xattr_hash_desc, hash_info, iter, k);
-fsck_err:
- 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)));
- 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, c, root_subvol_missing,
- "root subvol missing")) {
- struct bkey_i_subvolume root_subvol;
-
- 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, c, root_dir_missing,
- "root directory missing") ||
- mustfix_fsck_err_on(!S_ISDIR(root_inode.bi_mode),
- c, 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 = __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;
-}
-
-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;
-}
-
-static int path_down(struct bch_fs *c, pathbuf *p,
- u64 inum, u32 snapshot)
-{
- int ret = darray_push(p, ((struct pathbuf_entry) {
- .inum = inum,
- .snapshot = snapshot,
- }));
-
- if (ret)
- bch_err(c, "fsck: error allocating memory for pathbuf, size %zu",
- p->size);
- return ret;
-}
-
-/*
- * Check that a given inode is reachable from the root:
- *
- * XXX: we should also be verifying that inodes are in the right subvolumes
- */
-static int check_path(struct btree_trans *trans,
- pathbuf *p,
- struct bch_inode_unpacked *inode,
- u32 snapshot)
-{
- struct bch_fs *c = trans->c;
- int ret = 0;
-
- snapshot = bch2_snapshot_equiv(c, snapshot);
- p->nr = 0;
-
- while (!(inode->bi_inum == BCACHEFS_ROOT_INO &&
- inode->bi_subvol == BCACHEFS_ROOT_SUBVOL)) {
- struct btree_iter dirent_iter;
- struct bkey_s_c_dirent d;
- u32 parent_snapshot = snapshot;
-
- if (inode->bi_subvol) {
- u64 inum;
-
- ret = subvol_lookup(trans, inode->bi_parent_subvol,
- &parent_snapshot, &inum);
- if (ret)
- break;
- }
-
- d = dirent_get_by_pos(trans, &dirent_iter,
- SPOS(inode->bi_dir, inode->bi_dir_offset,
- parent_snapshot));
- ret = bkey_err(d.s_c);
- if (ret && !bch2_err_matches(ret, ENOENT))
- break;
-
- if (!ret && !dirent_points_to_inode(d, inode)) {
- bch2_trans_iter_exit(trans, &dirent_iter);
- ret = -BCH_ERR_ENOENT_dirent_doesnt_match_inode;
- }
-
- if (bch2_err_matches(ret, ENOENT)) {
- if (fsck_err(c, inode_unreachable,
- "unreachable inode %llu:%u, type %s nlink %u backptr %llu:%llu",
- inode->bi_inum, snapshot,
- bch2_d_type_str(inode_d_type(inode)),
- inode->bi_nlink,
- inode->bi_dir,
- inode->bi_dir_offset))
- ret = reattach_inode(trans, inode, snapshot);
- break;
- }
-
- bch2_trans_iter_exit(trans, &dirent_iter);
-
- if (!S_ISDIR(inode->bi_mode))
- break;
-
- ret = path_down(c, p, inode->bi_inum, snapshot);
- if (ret) {
- bch_err(c, "memory allocation failure");
- return ret;
- }
-
- snapshot = parent_snapshot;
-
- ret = lookup_inode(trans, inode->bi_dir, inode, &snapshot);
- if (ret) {
- /* Should have been caught in dirents pass */
- if (!bch2_err_matches(ret, BCH_ERR_transaction_restart))
- bch_err(c, "error looking up parent directory: %i", ret);
- break;
- }
-
- 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(c, dir_loop, "directory structure loop"))
- return 0;
-
- ret = remove_backpointer(trans, inode);
- if (ret && !bch2_err_matches(ret, BCH_ERR_transaction_restart))
- bch_err_msg(c, ret, "removing dirent");
- if (ret)
- break;
-
- ret = reattach_inode(trans, inode, snapshot);
- if (ret && !bch2_err_matches(ret, BCH_ERR_transaction_restart))
- bch_err_msg(c, ret, "reattaching inode %llu", inode->bi_inum);
- break;
- }
- }
-fsck_err:
- 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)
-{
- struct bch_inode_unpacked u;
- 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;
-
- BUG_ON(bch2_inode_unpack(k, &u));
-
- if (u.bi_flags & BCH_INODE_unlinked)
- continue;
-
- check_path(trans, &path, &u, iter.pos.snapshot);
- })));
- 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),
- bch2_snapshot_equiv(c, 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_fs *c = trans->c;
- 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,
- c, 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 = __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;
-}
generated by cgit v1.2.3 (git 2.39.1) at 2024-07-02 22:00:48 +0000