// SPDX-License-Identifier: GPL-2.0
#include "bcachefs.h"
+#include "bbpos.h"
#include "alloc_background.h"
#include "backpointers.h"
#include "btree_cache.h"
#include "btree_update.h"
#include "error.h"
+#include <linux/mm.h>
+
#define MAX_EXTENT_COMPRESS_RATIO_SHIFT 10
/*
u64 bucket_offset)
{
struct bch_dev *ca = bch_dev_bkey_exists(c, bucket.inode);
+ struct bpos ret;
+
+ ret = POS(bucket.inode,
+ (bucket_to_sector(ca, bucket.offset) <<
+ MAX_EXTENT_COMPRESS_RATIO_SHIFT) + bucket_offset);
- return POS(bucket.inode,
- (bucket_to_sector(ca, bucket.offset) <<
- MAX_EXTENT_COMPRESS_RATIO_SHIFT) + bucket_offset);
+ BUG_ON(bkey_cmp(bucket, bp_pos_to_bucket(c, ret)));
+
+ return ret;
}
void bch2_extent_ptr_to_bp(struct bch_fs *c,
int bch2_get_next_backpointer(struct btree_trans *trans,
struct bpos bucket, int gen,
u64 *bp_offset,
- struct bch_backpointer *dst)
+ struct bch_backpointer *dst,
+ unsigned iter_flags)
{
struct bch_fs *c = trans->c;
- struct bpos bp_pos =
- bucket_pos_to_bp(c, bucket,
- max(*bp_offset, BACKPOINTER_OFFSET_MAX) - BACKPOINTER_OFFSET_MAX);
- struct bpos bp_end_pos =
- bucket_pos_to_bp(c, bpos_nosnap_successor(bucket), 0);
+ 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);
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 (extent_matches_bp(c, bp.btree_id, bp.level, k, bucket, bp))
+ if (k.k && extent_matches_bp(c, bp.btree_id, bp.level, k, bucket, bp))
return k;
bch2_trans_iter_exit(trans, iter);
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:
*/
- bch2_backpointer_get_node(trans, iter, bucket, bp_offset, bp);
+ 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;
}
if (IS_ERR(b))
goto err;
- if (extent_matches_bp(c, bp.btree_id, bp.level,
- bkey_i_to_s_c(&b->key),
- bucket, bp))
+ if (b && extent_matches_bp(c, bp.btree_id, bp.level,
+ bkey_i_to_s_c(&b->key),
+ bucket, bp))
return b;
- if (btree_node_will_make_reachable(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,
static int check_bp_exists(struct btree_trans *trans,
struct bpos bucket_pos,
struct bch_backpointer bp,
- struct bkey_s_c orig_k)
+ struct bkey_s_c orig_k,
+ struct bpos bucket_start,
+ struct bpos bucket_end)
{
struct bch_fs *c = trans->c;
struct btree_iter alloc_iter, bp_iter = { NULL };
struct bkey_s_c alloc_k, bp_k;
int ret;
+ if (bpos_cmp(bucket_pos, bucket_start) < 0 ||
+ bpos_cmp(bucket_pos, bucket_end) > 0)
+ return 0;
+
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);
}
static int check_extent_to_backpointers(struct btree_trans *trans,
- struct btree_iter *iter)
+ struct btree_iter *iter,
+ struct bpos bucket_start,
+ struct bpos bucket_end)
{
struct bch_fs *c = trans->c;
struct bkey_ptrs_c ptrs;
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);
+ ret = check_bp_exists(trans, bucket_pos, bp, k, bucket_start, bucket_end);
if (ret)
return ret;
}
}
static int check_btree_root_to_backpointers(struct btree_trans *trans,
- enum btree_id btree_id)
+ enum btree_id btree_id,
+ struct bpos bucket_start,
+ struct bpos bucket_end)
{
struct bch_fs *c = trans->c;
struct btree_iter iter;
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);
+ ret = check_bp_exists(trans, bucket_pos, bp, k, bucket_start, bucket_end);
if (ret)
goto err;
}
return ret;
}
-int bch2_check_extents_to_backpointers(struct bch_fs *c)
+static inline struct bbpos bp_to_bbpos(struct bch_backpointer bp)
+{
+ return (struct bbpos) {
+ .btree = bp.btree_id,
+ .pos = bp.pos,
+ };
+}
+
+static size_t btree_nodes_fit_in_ram(struct bch_fs *c)
+{
+ struct sysinfo i;
+ u64 mem_bytes;
+
+ si_meminfo(&i);
+ mem_bytes = i.totalram * i.mem_unit;
+ return (mem_bytes >> 1) / btree_bytes(c);
+}
+
+int bch2_get_btree_in_memory_pos(struct btree_trans *trans,
+ unsigned btree_leaf_mask,
+ unsigned btree_interior_mask,
+ struct bbpos start, struct bbpos *end)
+{
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ size_t btree_nodes = btree_nodes_fit_in_ram(trans->c);
+ enum btree_id btree;
+ int ret = 0;
+
+ for (btree = start.btree; btree < BTREE_ID_NR && !ret; btree++) {
+ unsigned depth = ((1U << btree) & btree_leaf_mask) ? 1 : 2;
+
+ if (!((1U << btree) & btree_leaf_mask) &&
+ !((1U << btree) & btree_interior_mask))
+ continue;
+
+ bch2_trans_node_iter_init(trans, &iter, btree,
+ btree == start.btree ? start.pos : POS_MIN,
+ 0, depth, 0);
+ /*
+ * for_each_btree_key_contineu() doesn't check the return value
+ * from bch2_btree_iter_advance(), which is needed when
+ * iterating over interior nodes where we'll see keys at
+ * SPOS_MAX:
+ */
+ do {
+ k = __bch2_btree_iter_peek_and_restart(trans, &iter, 0);
+ ret = bkey_err(k);
+ if (!k.k || ret)
+ break;
+
+ --btree_nodes;
+ if (!btree_nodes) {
+ *end = BBPOS(btree, k.k->p);
+ bch2_trans_iter_exit(trans, &iter);
+ return 0;
+ }
+ } while (bch2_btree_iter_advance(&iter));
+ bch2_trans_iter_exit(trans, &iter);
+ }
+
+ *end = BBPOS_MAX;
+ return ret;
+}
+
+static int bch2_check_extents_to_backpointers_pass(struct btree_trans *trans,
+ struct bpos bucket_start,
+ struct bpos bucket_end)
{
- 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++) {
- bch2_trans_node_iter_init(&trans, &iter, btree_id, POS_MIN, 0,
- 0,
+ 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));
+ ret = commit_do(trans, NULL, NULL,
+ BTREE_INSERT_LAZY_RW|
+ BTREE_INSERT_NOFAIL,
+ check_extent_to_backpointers(trans, &iter,
+ bucket_start, bucket_end));
if (ret)
break;
} while (!bch2_btree_iter_advance(&iter));
- bch2_trans_iter_exit(&trans, &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));
+ ret = commit_do(trans, NULL, NULL,
+ BTREE_INSERT_LAZY_RW|
+ BTREE_INSERT_NOFAIL,
+ check_btree_root_to_backpointers(trans, btree_id,
+ bucket_start, bucket_end));
+ if (ret)
+ break;
+ }
+ return ret;
+}
+
+int bch2_get_alloc_in_memory_pos(struct btree_trans *trans,
+ struct bpos start, struct bpos *end)
+{
+ struct btree_iter alloc_iter;
+ struct btree_iter bp_iter;
+ struct bkey_s_c alloc_k, bp_k;
+ size_t btree_nodes = btree_nodes_fit_in_ram(trans->c);
+ bool alloc_end = false, bp_end = false;
+ int ret = 0;
+
+ bch2_trans_node_iter_init(trans, &alloc_iter, BTREE_ID_alloc,
+ start, 0, 1, 0);
+ bch2_trans_node_iter_init(trans, &bp_iter, BTREE_ID_backpointers,
+ bucket_pos_to_bp(trans->c, start, 0), 0, 1, 0);
+ while (1) {
+ alloc_k = !alloc_end
+ ? __bch2_btree_iter_peek_and_restart(trans, &alloc_iter, 0)
+ : bkey_s_c_null;
+ bp_k = !bp_end
+ ? __bch2_btree_iter_peek_and_restart(trans, &bp_iter, 0)
+ : bkey_s_c_null;
+
+ ret = bkey_err(alloc_k) ?: bkey_err(bp_k);
+ if ((!alloc_k.k && !bp_k.k) || ret) {
+ *end = SPOS_MAX;
+ break;
+ }
+
+ --btree_nodes;
+ if (!btree_nodes) {
+ *end = alloc_k.k->p;
+ break;
+ }
+
+ if (bpos_cmp(alloc_iter.pos, SPOS_MAX) &&
+ bpos_cmp(bucket_pos_to_bp(trans->c, alloc_iter.pos, 0), bp_iter.pos) < 0) {
+ if (!bch2_btree_iter_advance(&alloc_iter))
+ alloc_end = true;
+ } else {
+ if (!bch2_btree_iter_advance(&bp_iter))
+ bp_end = true;
+ }
+ }
+ bch2_trans_iter_exit(trans, &bp_iter);
+ bch2_trans_iter_exit(trans, &alloc_iter);
+ return ret;
+}
+
+int bch2_check_extents_to_backpointers(struct bch_fs *c)
+{
+ struct btree_trans trans;
+ struct bpos start = POS_MIN, end;
+ int ret;
+
+ bch2_trans_init(&trans, c, 0, 0);
+ while (1) {
+ ret = bch2_get_alloc_in_memory_pos(&trans, start, &end);
if (ret)
break;
+
+ if (!bpos_cmp(start, POS_MIN) && bpos_cmp(end, SPOS_MAX))
+ bch_verbose(c, "%s(): alloc info does not fit in ram, running in multiple passes with %zu nodes per pass",
+ __func__, btree_nodes_fit_in_ram(c));
+
+ if (bpos_cmp(start, POS_MIN) || bpos_cmp(end, SPOS_MAX)) {
+ struct printbuf buf = PRINTBUF;
+
+ prt_str(&buf, "check_extents_to_backpointers(): ");
+ bch2_bpos_to_text(&buf, start);
+ prt_str(&buf, "-");
+ bch2_bpos_to_text(&buf, end);
+
+ bch_verbose(c, "%s", buf.buf);
+ printbuf_exit(&buf);
+ }
+
+ ret = bch2_check_extents_to_backpointers_pass(&trans, start, end);
+ if (ret || !bpos_cmp(end, SPOS_MAX))
+ break;
+
+ start = bpos_successor(end);
}
bch2_trans_exit(&trans);
+
return ret;
}
static int check_one_backpointer(struct btree_trans *trans,
struct bpos bucket,
- u64 *bp_offset)
+ u64 *bp_offset,
+ struct bbpos start,
+ struct bbpos end)
{
struct btree_iter iter;
struct bch_backpointer bp;
+ struct bbpos pos;
struct bkey_s_c k;
struct printbuf buf = PRINTBUF;
int ret;
- ret = bch2_get_next_backpointer(trans, bucket, -1,
- bp_offset, &bp);
+ ret = bch2_get_next_backpointer(trans, bucket, -1, bp_offset, &bp, 0);
if (ret || *bp_offset == U64_MAX)
return ret;
+ pos = bp_to_bbpos(bp);
+ if (bbpos_cmp(pos, start) < 0 ||
+ bbpos_cmp(pos, end) > 0)
+ return 0;
+
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 ret;
}
-int bch2_check_backpointers_to_extents(struct bch_fs *c)
+static int bch2_check_backpointers_to_extents_pass(struct btree_trans *trans,
+ struct bbpos start,
+ struct bbpos end)
{
- 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,
+ 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))) &&
+ while (!(ret = commit_do(trans, NULL, NULL,
+ BTREE_INSERT_LAZY_RW|
+ BTREE_INSERT_NOFAIL,
+ check_one_backpointer(trans, iter.pos, &bp_offset, start, end))) &&
bp_offset < U64_MAX)
bp_offset++;
if (ret)
break;
}
- bch2_trans_iter_exit(&trans, &iter);
- bch2_trans_exit(&trans);
+ bch2_trans_iter_exit(trans, &iter);
return ret < 0 ? ret : 0;
}
+
+int bch2_check_backpointers_to_extents(struct bch_fs *c)
+{
+ struct btree_trans trans;
+ struct bbpos start = (struct bbpos) { .btree = 0, .pos = POS_MIN, }, end;
+ int ret;
+
+ bch2_trans_init(&trans, c, 0, 0);
+ while (1) {
+ ret = bch2_get_btree_in_memory_pos(&trans,
+ (1U << BTREE_ID_extents)|
+ (1U << BTREE_ID_reflink),
+ ~0,
+ start, &end);
+ if (ret)
+ break;
+
+ if (!bbpos_cmp(start, BBPOS_MIN) &&
+ bbpos_cmp(end, BBPOS_MAX))
+ bch_verbose(c, "%s(): extents do not fit in ram, running in multiple passes with %zu nodes per pass",
+ __func__, btree_nodes_fit_in_ram(c));
+
+ if (bbpos_cmp(start, BBPOS_MIN) ||
+ bbpos_cmp(end, BBPOS_MAX)) {
+ struct printbuf buf = PRINTBUF;
+
+ prt_str(&buf, "check_backpointers_to_extents(): ");
+ bch2_bbpos_to_text(&buf, start);
+ prt_str(&buf, "-");
+ bch2_bbpos_to_text(&buf, end);
+
+ bch_verbose(c, "%s", buf.buf);
+ printbuf_exit(&buf);
+ }
+
+ ret = bch2_check_backpointers_to_extents_pass(&trans, start, end);
+ if (ret || !bbpos_cmp(end, BBPOS_MAX))
+ break;
+
+ start = bbpos_successor(end);
+ }
+ bch2_trans_exit(&trans);
+
+ return ret;
+}
projects / bcachefs-tools-debian / blobdiff