#include "bcachefs.h"
#include "alloc_background.h"
#include "alloc_foreground.h"
+#include "backpointers.h"
#include "btree_cache.h"
#include "btree_io.h"
#include "btree_key_cache.h"
{
struct bkey_s_c_alloc_v4 a = bkey_s_c_to_alloc_v4(k);
- if (bkey_val_bytes(k.k) != sizeof(struct bch_alloc_v4)) {
- prt_printf(err, "bad val size (%zu != %zu)",
- bkey_val_bytes(k.k), sizeof(struct bch_alloc_v4));
+ if (alloc_v4_u64s(a.v) != bkey_val_u64s(k.k)) {
+ prt_printf(err, "bad val size (%lu != %u)",
+ bkey_val_u64s(k.k), alloc_v4_u64s(a.v));
return -BCH_ERR_invalid_bkey;
}
+ if (!BCH_ALLOC_V4_BACKPOINTERS_START(a.v) &&
+ BCH_ALLOC_V4_NR_BACKPOINTERS(a.v)) {
+ prt_printf(err, "invalid backpointers_start");
+ return -BCH_ERR_invalid_bkey;
+ }
+
+ /*
+ * XXX this is wrong, we'll be checking updates that happened from
+ * before BCH_FS_CHECK_BACKPOINTERS_DONE
+ */
+ if (rw == WRITE && test_bit(BCH_FS_CHECK_BACKPOINTERS_DONE, &c->flags)) {
+ unsigned i, bp_len = 0;
+
+ for (i = 0; i < BCH_ALLOC_V4_NR_BACKPOINTERS(a.v); i++)
+ bp_len += alloc_v4_backpointers_c(a.v)[i].bucket_len;
+
+ if (bp_len > a.v->dirty_sectors) {
+ prt_printf(err, "too many backpointers");
+ return -BCH_ERR_invalid_bkey;
+ }
+ }
+
if (rw == WRITE) {
if (alloc_data_type(*a.v, a.v->data_type) != a.v->data_type) {
prt_printf(err, "invalid data type (got %u should be %u)",
return 0;
}
+static inline u64 swab40(u64 x)
+{
+ return (((x & 0x00000000ffULL) << 32)|
+ ((x & 0x000000ff00ULL) << 16)|
+ ((x & 0x0000ff0000ULL) >> 0)|
+ ((x & 0x00ff000000ULL) >> 16)|
+ ((x & 0xff00000000ULL) >> 32));
+}
+
void bch2_alloc_v4_swab(struct bkey_s k)
{
struct bch_alloc_v4 *a = bkey_s_to_alloc_v4(k).v;
+ struct bch_backpointer *bp, *bps;
a->journal_seq = swab64(a->journal_seq);
a->flags = swab32(a->flags);
a->io_time[1] = swab64(a->io_time[1]);
a->stripe = swab32(a->stripe);
a->nr_external_backpointers = swab32(a->nr_external_backpointers);
+
+ bps = alloc_v4_backpointers(a);
+ for (bp = bps; bp < bps + BCH_ALLOC_V4_NR_BACKPOINTERS(a); bp++) {
+ bp->bucket_offset = swab40(bp->bucket_offset);
+ bp->bucket_len = swab32(bp->bucket_len);
+ bch2_bpos_swab(&bp->pos);
+ }
}
void bch2_alloc_to_text(struct printbuf *out, struct bch_fs *c, struct bkey_s_c k)
{
struct bch_alloc_v4 _a;
const struct bch_alloc_v4 *a = bch2_alloc_to_v4(k, &_a);
+ unsigned i;
prt_newline(out);
printbuf_indent_add(out, 2);
prt_newline(out);
prt_printf(out, "io_time[WRITE] %llu", a->io_time[WRITE]);
prt_newline(out);
- prt_printf(out, "backpointers: %llu", BCH_ALLOC_V4_NR_BACKPOINTERS(a));
+ prt_printf(out, "bp_start %llu", BCH_ALLOC_V4_BACKPOINTERS_START(a));
+ prt_newline(out);
- printbuf_indent_sub(out, 2);
-}
+ if (BCH_ALLOC_V4_NR_BACKPOINTERS(a)) {
+ struct bkey_s_c_alloc_v4 a_raw = bkey_s_c_to_alloc_v4(k);
+ const struct bch_backpointer *bps = alloc_v4_backpointers_c(a_raw.v);
-static inline void *alloc_v4_backpointers(struct bch_alloc_v4 *a)
-{
- return (void *) ((u64 *) &a->v + BCH_ALLOC_V4_BACKPOINTERS_START(a));
+ prt_printf(out, "backpointers: %llu", BCH_ALLOC_V4_NR_BACKPOINTERS(a_raw.v));
+ printbuf_indent_add(out, 2);
+
+ for (i = 0; i < BCH_ALLOC_V4_NR_BACKPOINTERS(a_raw.v); i++) {
+ prt_newline(out);
+ bch2_backpointer_to_text(out, &bps[i]);
+ }
+
+ printbuf_indent_sub(out, 2);
+ }
+
+ printbuf_indent_sub(out, 2);
}
void __bch2_alloc_to_v4(struct bkey_s_c k, struct bch_alloc_v4 *out)
__bch2_alloc_to_v4_mut(struct btree_trans *trans, struct bkey_s_c k)
{
struct bkey_i_alloc_v4 *ret;
-
if (k.k->type == KEY_TYPE_alloc_v4) {
- unsigned bytes = min(sizeof(struct bkey_i_alloc_v4), bkey_bytes(k.k));
+ struct bkey_s_c_alloc_v4 a = bkey_s_c_to_alloc_v4(k);
+ unsigned bytes = sizeof(struct bkey_i_alloc_v4) +
+ BCH_ALLOC_V4_NR_BACKPOINTERS(a.v) *
+ sizeof(struct bch_backpointer);
void *src, *dst;
- ret = bch2_trans_kmalloc(trans, bytes);
+ /*
+ * Reserve space for one more backpointer here:
+ * Not sketchy at doing it this way, nope...
+ */
+ ret = bch2_trans_kmalloc(trans, bytes + sizeof(struct bch_backpointer));
if (IS_ERR(ret))
return ret;
SET_BCH_ALLOC_V4_BACKPOINTERS_START(&ret->v, BCH_ALLOC_V4_U64s);
dst = alloc_v4_backpointers(&ret->v);
+ memmove(dst, src, BCH_ALLOC_V4_NR_BACKPOINTERS(&ret->v) *
+ sizeof(struct bch_backpointer));
if (src < dst)
memset(src, 0, dst - src);
set_alloc_v4_u64s(ret);
} else {
- ret = bch2_trans_kmalloc(trans, sizeof(*ret));
- if (!IS_ERR(ret)) {
- bkey_alloc_v4_init(&ret->k_i);
- ret->k.p = k.k->p;
- bch2_alloc_to_v4(k, &ret->v);
- }
+ ret = bch2_trans_kmalloc(trans, sizeof(struct bkey_i_alloc_v4) +
+ sizeof(struct bch_backpointer));
+ if (IS_ERR(ret))
+ return ret;
+
+ bkey_alloc_v4_init(&ret->k_i);
+ ret->k.p = k.k->p;
+ bch2_alloc_to_v4(k, &ret->v);
}
return ret;
}
{
if (likely(k.k->type == KEY_TYPE_alloc_v4) &&
BCH_ALLOC_V4_BACKPOINTERS_START(bkey_s_c_to_alloc_v4(k).v) == BCH_ALLOC_V4_U64s) {
+ /*
+ * Reserve space for one more backpointer here:
+ * Not sketchy at doing it this way, nope...
+ */
struct bkey_i_alloc_v4 *ret =
- bch2_trans_kmalloc_nomemzero(trans, bkey_bytes(k.k));
+ bch2_trans_kmalloc_nomemzero(trans, bkey_bytes(k.k) + sizeof(struct bch_backpointer));
if (!IS_ERR(ret))
bkey_reassemble(&ret->k_i, k);
return ret;
--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+#include "bcachefs.h"
+#include "alloc_background.h"
+#include "backpointers.h"
+#include "btree_cache.h"
+#include "btree_update.h"
+#include "error.h"
+
+static bool extent_matches_bp(struct bch_fs *c,
+ enum btree_id btree_id, unsigned level,
+ struct bkey_s_c k,
+ struct bpos bucket,
+ struct bch_backpointer bp)
+{
+ struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
+ const union bch_extent_entry *entry;
+ struct extent_ptr_decoded p;
+
+ bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
+ struct bpos bucket2;
+ struct bch_backpointer bp2;
+
+ if (p.ptr.cached)
+ continue;
+
+ bch2_extent_ptr_to_bp(c, btree_id, level, k, p,
+ &bucket2, &bp2);
+ if (bpos_eq(bucket, bucket2) &&
+ !memcmp(&bp, &bp2, sizeof(bp)))
+ return true;
+ }
+
+ return false;
+}
+
+int bch2_backpointer_invalid(const struct bch_fs *c, struct bkey_s_c k,
+ int rw, struct printbuf *err)
+{
+ struct bkey_s_c_backpointer bp = bkey_s_c_to_backpointer(k);
+ struct bpos bucket = bp_pos_to_bucket(c, bp.k->p);
+
+ if (bkey_val_bytes(bp.k) < sizeof(*bp.v)) {
+ prt_str(err, "incorrect value size");
+ return -BCH_ERR_invalid_bkey;
+ }
+
+ if (!bpos_eq(bp.k->p, bucket_pos_to_bp(c, bucket, bp.v->bucket_offset))) {
+ prt_str(err, "backpointer at wrong pos");
+ return -BCH_ERR_invalid_bkey;
+ }
+
+ return 0;
+}
+
+void bch2_backpointer_to_text(struct printbuf *out, const struct bch_backpointer *bp)
+{
+ prt_printf(out, "btree=%s l=%u offset=%llu:%u len=%u pos=",
+ bch2_btree_ids[bp->btree_id],
+ bp->level,
+ (u64) (bp->bucket_offset >> MAX_EXTENT_COMPRESS_RATIO_SHIFT),
+ (u32) bp->bucket_offset & ~(~0U << MAX_EXTENT_COMPRESS_RATIO_SHIFT),
+ bp->bucket_len);
+ bch2_bpos_to_text(out, bp->pos);
+}
+
+void bch2_backpointer_k_to_text(struct printbuf *out, struct bch_fs *c, struct bkey_s_c k)
+{
+ bch2_backpointer_to_text(out, bkey_s_c_to_backpointer(k).v);
+}
+
+void bch2_backpointer_swab(struct bkey_s k)
+{
+ struct bkey_s_backpointer bp = bkey_s_to_backpointer(k);
+
+ bp.v->bucket_offset = swab32(bp.v->bucket_offset);
+ bp.v->bucket_len = swab32(bp.v->bucket_len);
+ bch2_bpos_swab(&bp.v->pos);
+}
+
+#define BACKPOINTER_OFFSET_MAX ((1ULL << 40) - 1)
+
+static inline int backpointer_cmp(struct bch_backpointer l, struct bch_backpointer r)
+{
+ return cmp_int(l.bucket_offset, r.bucket_offset);
+}
+
+static int bch2_backpointer_del_by_offset(struct btree_trans *trans,
+ struct bpos bucket,
+ u64 bp_offset,
+ struct bch_backpointer bp)
+{
+ struct bch_fs *c = trans->c;
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ int ret;
+
+ if (bp_offset < BACKPOINTER_OFFSET_MAX) {
+ struct bch_backpointer *bps;
+ struct bkey_i_alloc_v4 *a;
+ unsigned i, nr;
+
+ bch2_trans_iter_init(trans, &iter, BTREE_ID_alloc,
+ bucket,
+ BTREE_ITER_INTENT|
+ BTREE_ITER_SLOTS|
+ BTREE_ITER_WITH_UPDATES);
+ k = bch2_btree_iter_peek_slot(&iter);
+ ret = bkey_err(k);
+ if (ret)
+ goto err;
+
+ if (k.k->type != KEY_TYPE_alloc_v4) {
+ ret = -ENOENT;
+ goto err;
+ }
+
+ a = bch2_alloc_to_v4_mut(trans, k);
+ ret = PTR_ERR_OR_ZERO(a);
+ if (ret)
+ goto err;
+ bps = alloc_v4_backpointers(&a->v);
+ nr = BCH_ALLOC_V4_NR_BACKPOINTERS(&a->v);
+
+ for (i = 0; i < nr; i++) {
+ if (bps[i].bucket_offset == bp_offset)
+ goto found;
+ if (bps[i].bucket_offset > bp_offset)
+ break;
+ }
+
+ ret = -ENOENT;
+ goto err;
+found:
+ if (memcmp(&bps[i], &bp, sizeof(bp))) {
+ ret = -ENOENT;
+ goto err;
+ }
+ array_remove_item(bps, nr, i);
+ SET_BCH_ALLOC_V4_NR_BACKPOINTERS(&a->v, nr);
+ set_alloc_v4_u64s(a);
+ ret = bch2_trans_update(trans, &iter, &a->k_i, 0);
+ } else {
+ bp_offset -= BACKPOINTER_OFFSET_MAX;
+
+ bch2_trans_iter_init(trans, &iter, BTREE_ID_backpointers,
+ bucket_pos_to_bp(c, bucket, bp_offset),
+ BTREE_ITER_INTENT|
+ BTREE_ITER_SLOTS|
+ BTREE_ITER_WITH_UPDATES);
+ k = bch2_btree_iter_peek_slot(&iter);
+ ret = bkey_err(k);
+ if (ret)
+ goto err;
+
+ if (k.k->type != KEY_TYPE_backpointer ||
+ memcmp(bkey_s_c_to_backpointer(k).v, &bp, sizeof(bp))) {
+ ret = -ENOENT;
+ goto err;
+ }
+
+ ret = bch2_btree_delete_at(trans, &iter, 0);
+ }
+err:
+ bch2_trans_iter_exit(trans, &iter);
+ return ret;
+}
+
+bool bch2_bucket_backpointer_del(struct btree_trans *trans,
+ struct bkey_i_alloc_v4 *a,
+ struct bch_backpointer bp)
+{
+ struct bch_backpointer *bps = alloc_v4_backpointers(&a->v);
+ unsigned i, nr = BCH_ALLOC_V4_NR_BACKPOINTERS(&a->v);
+
+ for (i = 0; i < nr; i++) {
+ int cmp = backpointer_cmp(bps[i], bp) ?:
+ memcmp(&bps[i], &bp, sizeof(bp));
+ if (!cmp) {
+ array_remove_item(bps, nr, i);
+ SET_BCH_ALLOC_V4_NR_BACKPOINTERS(&a->v, nr);
+ set_alloc_v4_u64s(a);
+ return true;
+ }
+ if (cmp >= 0)
+ break;
+ }
+
+ return false;
+}
+
+static noinline int backpointer_mod_err(struct btree_trans *trans,
+ struct bch_backpointer bp,
+ struct bkey_s_c bp_k,
+ struct bkey_s_c orig_k,
+ bool insert)
+{
+ struct bch_fs *c = trans->c;
+ struct printbuf buf = PRINTBUF;
+
+ if (insert) {
+ prt_printf(&buf, "existing backpointer found when inserting ");
+ bch2_backpointer_to_text(&buf, &bp);
+ prt_newline(&buf);
+ printbuf_indent_add(&buf, 2);
+
+ prt_printf(&buf, "found ");
+ bch2_bkey_val_to_text(&buf, c, bp_k);
+ prt_newline(&buf);
+
+ prt_printf(&buf, "for ");
+ bch2_bkey_val_to_text(&buf, c, orig_k);
+
+ bch_err(c, "%s", buf.buf);
+ } else if (test_bit(BCH_FS_CHECK_BACKPOINTERS_DONE, &c->flags)) {
+ prt_printf(&buf, "backpointer not found when deleting");
+ prt_newline(&buf);
+ printbuf_indent_add(&buf, 2);
+
+ prt_printf(&buf, "searching for ");
+ bch2_backpointer_to_text(&buf, &bp);
+ prt_newline(&buf);
+
+ prt_printf(&buf, "got ");
+ bch2_bkey_val_to_text(&buf, c, bp_k);
+ prt_newline(&buf);
+
+ prt_printf(&buf, "for ");
+ bch2_bkey_val_to_text(&buf, c, orig_k);
+
+ bch_err(c, "%s", buf.buf);
+ }
+
+ printbuf_exit(&buf);
+
+ if (test_bit(BCH_FS_CHECK_BACKPOINTERS_DONE, &c->flags)) {
+ bch2_inconsistent_error(c);
+ return -EIO;
+ } else {
+ return 0;
+ }
+}
+
+int bch2_bucket_backpointer_mod_nowritebuffer(struct btree_trans *trans,
+ struct bkey_i_alloc_v4 *a,
+ struct bch_backpointer bp,
+ struct bkey_s_c orig_k,
+ bool insert)
+{
+ struct bch_fs *c = trans->c;
+ struct bkey_i_backpointer *bp_k;
+ struct btree_iter bp_iter;
+ struct bkey_s_c k;
+ int ret;
+
+ bp_k = bch2_trans_kmalloc_nomemzero(trans, sizeof(struct bkey_i_backpointer));
+ ret = PTR_ERR_OR_ZERO(bp_k);
+ if (ret)
+ return ret;
+
+ bkey_backpointer_init(&bp_k->k_i);
+ bp_k->k.p = bucket_pos_to_bp(c, a->k.p, bp.bucket_offset);
+ bp_k->v = bp;
+
+ if (!insert) {
+ bp_k->k.type = KEY_TYPE_deleted;
+ set_bkey_val_u64s(&bp_k->k, 0);
+ }
+
+ bch2_trans_iter_init(trans, &bp_iter, BTREE_ID_backpointers,
+ bucket_pos_to_bp(c, a->k.p, bp.bucket_offset),
+ BTREE_ITER_INTENT|
+ BTREE_ITER_SLOTS|
+ BTREE_ITER_WITH_UPDATES);
+ k = bch2_btree_iter_peek_slot(&bp_iter);
+ ret = bkey_err(k);
+ if (ret)
+ goto err;
+
+ if (insert
+ ? k.k->type
+ : (k.k->type != KEY_TYPE_backpointer ||
+ memcmp(bkey_s_c_to_backpointer(k).v, &bp, sizeof(bp)))) {
+ ret = backpointer_mod_err(trans, bp, k, orig_k, insert);
+ if (ret)
+ goto err;
+ }
+
+ ret = bch2_trans_update(trans, &bp_iter, &bp_k->k_i, 0);
+err:
+ bch2_trans_iter_exit(trans, &bp_iter);
+ return ret;
+}
+
+/*
+ * Find the next backpointer >= *bp_offset:
+ */
+int bch2_get_next_backpointer(struct btree_trans *trans,
+ struct bpos bucket, int gen,
+ u64 *bp_offset,
+ struct bch_backpointer *dst)
+{
+ struct bch_fs *c = trans->c;
+ struct bpos bp_pos, bp_end_pos;
+ struct btree_iter alloc_iter, bp_iter = { NULL };
+ struct bkey_s_c k;
+ struct bkey_s_c_alloc_v4 a;
+ size_t i;
+ int ret;
+
+ if (*bp_offset == U64_MAX)
+ return 0;
+
+ bp_pos = bucket_pos_to_bp(c, bucket,
+ max(*bp_offset, BACKPOINTER_OFFSET_MAX) - BACKPOINTER_OFFSET_MAX);
+ bp_end_pos = bucket_pos_to_bp(c, bpos_nosnap_successor(bucket), 0);
+
+ bch2_trans_iter_init(trans, &alloc_iter, BTREE_ID_alloc,
+ bucket, BTREE_ITER_CACHED);
+ k = bch2_btree_iter_peek_slot(&alloc_iter);
+ ret = bkey_err(k);
+ if (ret)
+ goto out;
+
+ if (k.k->type != KEY_TYPE_alloc_v4)
+ goto done;
+
+ a = bkey_s_c_to_alloc_v4(k);
+ if (gen >= 0 && a.v->gen != gen)
+ goto done;
+
+ for (i = 0; i < BCH_ALLOC_V4_NR_BACKPOINTERS(a.v); i++) {
+ if (alloc_v4_backpointers_c(a.v)[i].bucket_offset < *bp_offset)
+ continue;
+
+ *dst = alloc_v4_backpointers_c(a.v)[i];
+ *bp_offset = dst->bucket_offset;
+ goto out;
+ }
+
+ for_each_btree_key_norestart(trans, bp_iter, BTREE_ID_backpointers,
+ bp_pos, 0, k, ret) {
+ if (bpos_ge(k.k->p, bp_end_pos))
+ break;
+
+ if (k.k->type != KEY_TYPE_backpointer)
+ continue;
+
+ *dst = *bkey_s_c_to_backpointer(k).v;
+ *bp_offset = dst->bucket_offset + BACKPOINTER_OFFSET_MAX;
+ goto out;
+ }
+done:
+ *bp_offset = U64_MAX;
+out:
+ bch2_trans_iter_exit(trans, &bp_iter);
+ bch2_trans_iter_exit(trans, &alloc_iter);
+ return ret;
+}
+
+static void backpointer_not_found(struct btree_trans *trans,
+ struct bpos bucket,
+ u64 bp_offset,
+ struct bch_backpointer bp,
+ struct bkey_s_c k,
+ const char *thing_it_points_to)
+{
+ struct bch_fs *c = trans->c;
+ struct printbuf buf = PRINTBUF;
+
+ if (likely(!bch2_backpointers_no_use_write_buffer))
+ return;
+
+ prt_printf(&buf, "backpointer doesn't match %s it points to:\n ",
+ thing_it_points_to);
+ prt_printf(&buf, "bucket: ");
+ bch2_bpos_to_text(&buf, bucket);
+ prt_printf(&buf, "\n ");
+
+ if (bp_offset >= BACKPOINTER_OFFSET_MAX) {
+ struct bpos bp_pos =
+ bucket_pos_to_bp(c, bucket,
+ bp_offset - BACKPOINTER_OFFSET_MAX);
+ prt_printf(&buf, "backpointer pos: ");
+ bch2_bpos_to_text(&buf, bp_pos);
+ prt_printf(&buf, "\n ");
+ }
+
+ bch2_backpointer_to_text(&buf, &bp);
+ prt_printf(&buf, "\n ");
+ bch2_bkey_val_to_text(&buf, c, k);
+ if (!test_bit(BCH_FS_CHECK_BACKPOINTERS_DONE, &c->flags))
+ bch_err_ratelimited(c, "%s", buf.buf);
+ else
+ bch2_trans_inconsistent(trans, "%s", buf.buf);
+
+ printbuf_exit(&buf);
+}
+
+struct bkey_s_c bch2_backpointer_get_key(struct btree_trans *trans,
+ struct btree_iter *iter,
+ struct bpos bucket,
+ u64 bp_offset,
+ struct bch_backpointer bp)
+{
+ struct bch_fs *c = trans->c;
+ struct bkey_s_c k;
+
+ bch2_trans_node_iter_init(trans, iter,
+ bp.btree_id,
+ bp.pos,
+ 0,
+ min(bp.level, c->btree_roots[bp.btree_id].level),
+ 0);
+ k = bch2_btree_iter_peek_slot(iter);
+ if (bkey_err(k)) {
+ bch2_trans_iter_exit(trans, iter);
+ return k;
+ }
+
+ if (bp.level == c->btree_roots[bp.btree_id].level + 1)
+ k = bkey_i_to_s_c(&c->btree_roots[bp.btree_id].key);
+
+ if (k.k && extent_matches_bp(c, bp.btree_id, bp.level, k, bucket, bp))
+ return k;
+
+ bch2_trans_iter_exit(trans, iter);
+
+ if (unlikely(bch2_backpointers_no_use_write_buffer)) {
+ if (bp.level) {
+ struct btree *b;
+
+ /*
+ * If a backpointer for a btree node wasn't found, it may be
+ * because it was overwritten by a new btree node that hasn't
+ * been written out yet - backpointer_get_node() checks for
+ * this:
+ */
+ b = bch2_backpointer_get_node(trans, iter, bucket, bp_offset, bp);
+ if (!IS_ERR_OR_NULL(b))
+ return bkey_i_to_s_c(&b->key);
+
+ bch2_trans_iter_exit(trans, iter);
+
+ if (IS_ERR(b))
+ return bkey_s_c_err(PTR_ERR(b));
+ return bkey_s_c_null;
+ }
+
+ backpointer_not_found(trans, bucket, bp_offset, bp, k, "extent");
+ }
+
+ return bkey_s_c_null;
+}
+
+struct btree *bch2_backpointer_get_node(struct btree_trans *trans,
+ struct btree_iter *iter,
+ struct bpos bucket,
+ u64 bp_offset,
+ struct bch_backpointer bp)
+{
+ struct bch_fs *c = trans->c;
+ struct btree *b;
+
+ BUG_ON(!bp.level);
+
+ bch2_trans_node_iter_init(trans, iter,
+ bp.btree_id,
+ bp.pos,
+ 0,
+ bp.level - 1,
+ 0);
+ b = bch2_btree_iter_peek_node(iter);
+ if (IS_ERR(b))
+ goto err;
+
+ if (b && extent_matches_bp(c, bp.btree_id, bp.level,
+ bkey_i_to_s_c(&b->key),
+ bucket, bp))
+ return b;
+
+ if (b && btree_node_will_make_reachable(b)) {
+ b = ERR_PTR(-BCH_ERR_backpointer_to_overwritten_btree_node);
+ } else {
+ backpointer_not_found(trans, bucket, bp_offset, bp,
+ bkey_i_to_s_c(&b->key), "btree node");
+ b = NULL;
+ }
+err:
+ bch2_trans_iter_exit(trans, iter);
+ return b;
+}
+
+static int bch2_check_btree_backpointer(struct btree_trans *trans, struct btree_iter *bp_iter,
+ struct bkey_s_c k)
+{
+ struct bch_fs *c = trans->c;
+ struct btree_iter alloc_iter = { NULL };
+ struct bch_dev *ca;
+ struct bkey_s_c alloc_k;
+ struct printbuf buf = PRINTBUF;
+ int ret = 0;
+
+ if (fsck_err_on(!bch2_dev_exists2(c, k.k->p.inode), c,
+ "backpointer for mising device:\n%s",
+ (bch2_bkey_val_to_text(&buf, c, k), buf.buf))) {
+ ret = bch2_btree_delete_at(trans, bp_iter, 0);
+ goto out;
+ }
+
+ ca = bch_dev_bkey_exists(c, k.k->p.inode);
+
+ bch2_trans_iter_init(trans, &alloc_iter, BTREE_ID_alloc,
+ bp_pos_to_bucket(c, k.k->p), 0);
+
+ alloc_k = bch2_btree_iter_peek_slot(&alloc_iter);
+ ret = bkey_err(alloc_k);
+ if (ret)
+ goto out;
+
+ if (fsck_err_on(alloc_k.k->type != KEY_TYPE_alloc_v4, c,
+ "backpointer for nonexistent alloc key: %llu:%llu:0\n%s",
+ alloc_iter.pos.inode, alloc_iter.pos.offset,
+ (bch2_bkey_val_to_text(&buf, c, alloc_k), buf.buf))) {
+ ret = bch2_btree_delete_at(trans, bp_iter, 0);
+ goto out;
+ }
+out:
+fsck_err:
+ bch2_trans_iter_exit(trans, &alloc_iter);
+ printbuf_exit(&buf);
+ return ret;
+}
+
+/* verify that every backpointer has a corresponding alloc key */
+int bch2_check_btree_backpointers(struct bch_fs *c)
+{
+ struct btree_iter iter;
+ struct bkey_s_c k;
+
+ return bch2_trans_run(c,
+ for_each_btree_key_commit(&trans, iter,
+ BTREE_ID_backpointers, POS_MIN, 0, k,
+ NULL, NULL, BTREE_INSERT_LAZY_RW|BTREE_INSERT_NOFAIL,
+ bch2_check_btree_backpointer(&trans, &iter, k)));
+}
+
+static int check_bp_exists(struct btree_trans *trans,
+ struct bpos bucket_pos,
+ struct bch_backpointer bp,
+ struct bkey_s_c orig_k)
+{
+ struct bch_fs *c = trans->c;
+ struct btree_iter alloc_iter, bp_iter = { NULL };
+ struct printbuf buf = PRINTBUF;
+ struct bkey_s_c alloc_k, bp_k;
+ int ret;
+
+ bch2_trans_iter_init(trans, &alloc_iter, BTREE_ID_alloc, bucket_pos, 0);
+ alloc_k = bch2_btree_iter_peek_slot(&alloc_iter);
+ ret = bkey_err(alloc_k);
+ if (ret)
+ goto err;
+
+ if (alloc_k.k->type == KEY_TYPE_alloc_v4) {
+ struct bkey_s_c_alloc_v4 a = bkey_s_c_to_alloc_v4(alloc_k);
+ const struct bch_backpointer *bps = alloc_v4_backpointers_c(a.v);
+ unsigned i, nr = BCH_ALLOC_V4_NR_BACKPOINTERS(a.v);
+
+ for (i = 0; i < nr; i++) {
+ int cmp = backpointer_cmp(bps[i], bp) ?:
+ memcmp(&bps[i], &bp, sizeof(bp));
+ if (!cmp)
+ goto out;
+ if (cmp >= 0)
+ break;
+ }
+ } else {
+ goto missing;
+ }
+
+ bch2_trans_iter_init(trans, &bp_iter, BTREE_ID_backpointers,
+ bucket_pos_to_bp(c, bucket_pos, bp.bucket_offset),
+ 0);
+ bp_k = bch2_btree_iter_peek_slot(&bp_iter);
+ ret = bkey_err(bp_k);
+ if (ret)
+ goto err;
+
+ if (bp_k.k->type != KEY_TYPE_backpointer ||
+ memcmp(bkey_s_c_to_backpointer(bp_k).v, &bp, sizeof(bp)))
+ goto missing;
+out:
+err:
+fsck_err:
+ bch2_trans_iter_exit(trans, &bp_iter);
+ bch2_trans_iter_exit(trans, &alloc_iter);
+ printbuf_exit(&buf);
+ return ret;
+missing:
+ prt_printf(&buf, "missing backpointer for btree=%s l=%u ",
+ bch2_btree_ids[bp.btree_id], bp.level);
+ bch2_bkey_val_to_text(&buf, c, orig_k);
+ prt_printf(&buf, "\nbp pos ");
+ bch2_bpos_to_text(&buf, bp_iter.pos);
+
+ if (c->sb.version < bcachefs_metadata_version_backpointers ||
+ c->opts.reconstruct_alloc ||
+ fsck_err(c, "%s", buf.buf)) {
+ struct bkey_i_alloc_v4 *a = bch2_alloc_to_v4_mut(trans, alloc_k);
+
+ ret = PTR_ERR_OR_ZERO(a) ?:
+ bch2_bucket_backpointer_mod(trans, a, bp, orig_k, true);
+ }
+
+ goto out;
+}
+
+static int check_extent_to_backpointers(struct btree_trans *trans,
+ struct btree_iter *iter)
+{
+ struct bch_fs *c = trans->c;
+ struct bkey_ptrs_c ptrs;
+ const union bch_extent_entry *entry;
+ struct extent_ptr_decoded p;
+ struct bkey_s_c k;
+ int ret;
+
+ k = bch2_btree_iter_peek_all_levels(iter);
+ ret = bkey_err(k);
+ if (ret)
+ return ret;
+ if (!k.k)
+ return 0;
+
+ ptrs = bch2_bkey_ptrs_c(k);
+ bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
+ struct bpos bucket_pos;
+ struct bch_backpointer bp;
+
+ if (p.ptr.cached)
+ continue;
+
+ bch2_extent_ptr_to_bp(c, iter->btree_id, iter->path->level,
+ k, p, &bucket_pos, &bp);
+
+ ret = check_bp_exists(trans, bucket_pos, bp, k);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+}
+
+static int check_btree_root_to_backpointers(struct btree_trans *trans,
+ enum btree_id btree_id)
+{
+ struct bch_fs *c = trans->c;
+ struct btree_iter iter;
+ struct btree *b;
+ struct bkey_s_c k;
+ struct bkey_ptrs_c ptrs;
+ struct extent_ptr_decoded p;
+ const union bch_extent_entry *entry;
+ int ret;
+
+ bch2_trans_node_iter_init(trans, &iter, btree_id, POS_MIN, 0,
+ c->btree_roots[btree_id].level, 0);
+ b = bch2_btree_iter_peek_node(&iter);
+ ret = PTR_ERR_OR_ZERO(b);
+ if (ret)
+ goto err;
+
+ BUG_ON(b != btree_node_root(c, b));
+
+ k = bkey_i_to_s_c(&b->key);
+ ptrs = bch2_bkey_ptrs_c(k);
+ bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
+ struct bpos bucket_pos;
+ struct bch_backpointer bp;
+
+ if (p.ptr.cached)
+ continue;
+
+ bch2_extent_ptr_to_bp(c, iter.btree_id, iter.path->level + 1,
+ k, p, &bucket_pos, &bp);
+
+ ret = check_bp_exists(trans, bucket_pos, bp, k);
+ if (ret)
+ goto err;
+ }
+err:
+ bch2_trans_iter_exit(trans, &iter);
+ return ret;
+}
+
+int bch2_check_extents_to_backpointers(struct bch_fs *c)
+{
+ struct btree_trans trans;
+ struct btree_iter iter;
+ enum btree_id btree_id;
+ int ret = 0;
+
+ bch2_trans_init(&trans, c, 0, 0);
+ for (btree_id = 0; btree_id < BTREE_ID_NR; btree_id++) {
+ unsigned depth = btree_type_has_ptrs(btree_id) ? 0 : 1;
+
+ bch2_trans_node_iter_init(&trans, &iter, btree_id, POS_MIN, 0,
+ depth,
+ BTREE_ITER_ALL_LEVELS|
+ BTREE_ITER_PREFETCH);
+
+ do {
+ ret = commit_do(&trans, NULL, NULL,
+ BTREE_INSERT_LAZY_RW|
+ BTREE_INSERT_NOFAIL,
+ check_extent_to_backpointers(&trans, &iter));
+ if (ret)
+ break;
+ } while (!bch2_btree_iter_advance(&iter));
+
+ bch2_trans_iter_exit(&trans, &iter);
+
+ if (ret)
+ break;
+
+ ret = commit_do(&trans, NULL, NULL,
+ BTREE_INSERT_LAZY_RW|
+ BTREE_INSERT_NOFAIL,
+ check_btree_root_to_backpointers(&trans, btree_id));
+ if (ret)
+ break;
+ }
+ bch2_trans_exit(&trans);
+ return ret;
+}
+
+static int check_one_backpointer(struct btree_trans *trans,
+ struct bpos bucket,
+ u64 *bp_offset)
+{
+ struct btree_iter iter;
+ struct bch_backpointer bp;
+ struct bkey_s_c k;
+ struct printbuf buf = PRINTBUF;
+ int ret;
+
+ ret = bch2_get_next_backpointer(trans, bucket, -1,
+ bp_offset, &bp);
+ if (ret || *bp_offset == U64_MAX)
+ return ret;
+
+ k = bch2_backpointer_get_key(trans, &iter, bucket, *bp_offset, bp);
+ ret = bkey_err(k);
+ if (ret == -BCH_ERR_backpointer_to_overwritten_btree_node)
+ return 0;
+ if (ret)
+ return ret;
+
+ if (fsck_err_on(!k.k, trans->c,
+ "%s backpointer points to missing extent\n%s",
+ *bp_offset < BACKPOINTER_OFFSET_MAX ? "alloc" : "btree",
+ (bch2_backpointer_to_text(&buf, &bp), buf.buf))) {
+ ret = bch2_backpointer_del_by_offset(trans, bucket, *bp_offset, bp);
+ if (ret == -ENOENT)
+ bch_err(trans->c, "backpointer at %llu not found", *bp_offset);
+ }
+
+ bch2_trans_iter_exit(trans, &iter);
+fsck_err:
+ printbuf_exit(&buf);
+ return ret;
+}
+
+int bch2_check_backpointers_to_extents(struct bch_fs *c)
+{
+ struct btree_trans trans;
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ int ret = 0;
+
+ bch2_trans_init(&trans, c, 0, 0);
+ for_each_btree_key(&trans, iter, BTREE_ID_alloc, POS_MIN,
+ BTREE_ITER_PREFETCH, k, ret) {
+ u64 bp_offset = 0;
+
+ while (!(ret = commit_do(&trans, NULL, NULL,
+ BTREE_INSERT_LAZY_RW|
+ BTREE_INSERT_NOFAIL,
+ check_one_backpointer(&trans, iter.pos, &bp_offset))) &&
+ bp_offset < U64_MAX)
+ bp_offset++;
+
+ if (ret)
+ break;
+ }
+ bch2_trans_iter_exit(&trans, &iter);
+ bch2_trans_exit(&trans);
+ return ret < 0 ? ret : 0;
+}
projects / linux-block.git / commitdiff