diff options
Diffstat (limited to 'fs/bcachefs/bkey_methods.c')
-rw-r--r-- | fs/bcachefs/bkey_methods.c | 459 |
1 files changed, 459 insertions, 0 deletions
diff --git a/fs/bcachefs/bkey_methods.c b/fs/bcachefs/bkey_methods.c new file mode 100644 index 0000000000..761f5e33b1 --- /dev/null +++ b/fs/bcachefs/bkey_methods.c @@ -0,0 +1,459 @@ +// SPDX-License-Identifier: GPL-2.0 + +#include "bcachefs.h" +#include "backpointers.h" +#include "bkey_methods.h" +#include "btree_cache.h" +#include "btree_types.h" +#include "alloc_background.h" +#include "dirent.h" +#include "ec.h" +#include "error.h" +#include "extents.h" +#include "inode.h" +#include "io_misc.h" +#include "lru.h" +#include "quota.h" +#include "reflink.h" +#include "snapshot.h" +#include "subvolume.h" +#include "xattr.h" + +const char * const bch2_bkey_types[] = { +#define x(name, nr) #name, + BCH_BKEY_TYPES() +#undef x + NULL +}; + +static int deleted_key_invalid(struct bch_fs *c, struct bkey_s_c k, + enum bkey_invalid_flags flags, struct printbuf *err) +{ + return 0; +} + +#define bch2_bkey_ops_deleted ((struct bkey_ops) { \ + .key_invalid = deleted_key_invalid, \ +}) + +#define bch2_bkey_ops_whiteout ((struct bkey_ops) { \ + .key_invalid = deleted_key_invalid, \ +}) + +static int empty_val_key_invalid(struct bch_fs *c, struct bkey_s_c k, + enum bkey_invalid_flags flags, struct printbuf *err) +{ + int ret = 0; + + bkey_fsck_err_on(bkey_val_bytes(k.k), c, err, + bkey_val_size_nonzero, + "incorrect value size (%zu != 0)", + bkey_val_bytes(k.k)); +fsck_err: + return ret; +} + +#define bch2_bkey_ops_error ((struct bkey_ops) { \ + .key_invalid = empty_val_key_invalid, \ +}) + +static int key_type_cookie_invalid(struct bch_fs *c, struct bkey_s_c k, + enum bkey_invalid_flags flags, struct printbuf *err) +{ + return 0; +} + +#define bch2_bkey_ops_cookie ((struct bkey_ops) { \ + .key_invalid = key_type_cookie_invalid, \ + .min_val_size = 8, \ +}) + +#define bch2_bkey_ops_hash_whiteout ((struct bkey_ops) {\ + .key_invalid = empty_val_key_invalid, \ +}) + +static int key_type_inline_data_invalid(struct bch_fs *c, struct bkey_s_c k, + enum bkey_invalid_flags flags, struct printbuf *err) +{ + return 0; +} + +static void key_type_inline_data_to_text(struct printbuf *out, struct bch_fs *c, + struct bkey_s_c k) +{ + struct bkey_s_c_inline_data d = bkey_s_c_to_inline_data(k); + unsigned datalen = bkey_inline_data_bytes(k.k); + + prt_printf(out, "datalen %u: %*phN", + datalen, min(datalen, 32U), d.v->data); +} + +#define bch2_bkey_ops_inline_data ((struct bkey_ops) { \ + .key_invalid = key_type_inline_data_invalid, \ + .val_to_text = key_type_inline_data_to_text, \ +}) + +static bool key_type_set_merge(struct bch_fs *c, struct bkey_s l, struct bkey_s_c r) +{ + bch2_key_resize(l.k, l.k->size + r.k->size); + return true; +} + +#define bch2_bkey_ops_set ((struct bkey_ops) { \ + .key_invalid = empty_val_key_invalid, \ + .key_merge = key_type_set_merge, \ +}) + +const struct bkey_ops bch2_bkey_ops[] = { +#define x(name, nr) [KEY_TYPE_##name] = bch2_bkey_ops_##name, + BCH_BKEY_TYPES() +#undef x +}; + +const struct bkey_ops bch2_bkey_null_ops = { +}; + +int bch2_bkey_val_invalid(struct bch_fs *c, struct bkey_s_c k, + enum bkey_invalid_flags flags, + struct printbuf *err) +{ + const struct bkey_ops *ops = bch2_bkey_type_ops(k.k->type); + int ret = 0; + + bkey_fsck_err_on(bkey_val_bytes(k.k) < ops->min_val_size, c, err, + bkey_val_size_too_small, + "bad val size (%zu < %u)", + bkey_val_bytes(k.k), ops->min_val_size); + + if (!ops->key_invalid) + return 0; + + ret = ops->key_invalid(c, k, flags, err); +fsck_err: + return ret; +} + +static u64 bch2_key_types_allowed[] = { + [BKEY_TYPE_btree] = + BIT_ULL(KEY_TYPE_deleted)| + BIT_ULL(KEY_TYPE_btree_ptr)| + BIT_ULL(KEY_TYPE_btree_ptr_v2), +#define x(name, nr, flags, keys) [BKEY_TYPE_##name] = BIT_ULL(KEY_TYPE_deleted)|keys, + BCH_BTREE_IDS() +#undef x +}; + +const char *bch2_btree_node_type_str(enum btree_node_type type) +{ + return type == BKEY_TYPE_btree ? "internal btree node" : bch2_btree_id_str(type - 1); +} + +int __bch2_bkey_invalid(struct bch_fs *c, struct bkey_s_c k, + enum btree_node_type type, + enum bkey_invalid_flags flags, + struct printbuf *err) +{ + int ret = 0; + + bkey_fsck_err_on(k.k->u64s < BKEY_U64s, c, err, + bkey_u64s_too_small, + "u64s too small (%u < %zu)", k.k->u64s, BKEY_U64s); + + if (type >= BKEY_TYPE_NR) + return 0; + + bkey_fsck_err_on((flags & BKEY_INVALID_COMMIT) && + !(bch2_key_types_allowed[type] & BIT_ULL(k.k->type)), c, err, + bkey_invalid_type_for_btree, + "invalid key type for btree %s (%s)", + bch2_btree_node_type_str(type), bch2_bkey_types[k.k->type]); + + if (btree_node_type_is_extents(type) && !bkey_whiteout(k.k)) { + bkey_fsck_err_on(k.k->size == 0, c, err, + bkey_extent_size_zero, + "size == 0"); + + bkey_fsck_err_on(k.k->size > k.k->p.offset, c, err, + bkey_extent_size_greater_than_offset, + "size greater than offset (%u > %llu)", + k.k->size, k.k->p.offset); + } else { + bkey_fsck_err_on(k.k->size, c, err, + bkey_size_nonzero, + "size != 0"); + } + + if (type != BKEY_TYPE_btree) { + enum btree_id btree = type - 1; + + if (btree_type_has_snapshots(btree)) { + bkey_fsck_err_on(!k.k->p.snapshot, c, err, + bkey_snapshot_zero, + "snapshot == 0"); + } else if (!btree_type_has_snapshot_field(btree)) { + bkey_fsck_err_on(k.k->p.snapshot, c, err, + bkey_snapshot_nonzero, + "nonzero snapshot"); + } else { + /* + * btree uses snapshot field but it's not required to be + * nonzero + */ + } + + bkey_fsck_err_on(bkey_eq(k.k->p, POS_MAX), c, err, + bkey_at_pos_max, + "key at POS_MAX"); + } +fsck_err: + return ret; +} + +int bch2_bkey_invalid(struct bch_fs *c, struct bkey_s_c k, + enum btree_node_type type, + enum bkey_invalid_flags flags, + struct printbuf *err) +{ + return __bch2_bkey_invalid(c, k, type, flags, err) ?: + bch2_bkey_val_invalid(c, k, flags, err); +} + +int bch2_bkey_in_btree_node(struct bch_fs *c, struct btree *b, + struct bkey_s_c k, struct printbuf *err) +{ + int ret = 0; + + bkey_fsck_err_on(bpos_lt(k.k->p, b->data->min_key), c, err, + bkey_before_start_of_btree_node, + "key before start of btree node"); + + bkey_fsck_err_on(bpos_gt(k.k->p, b->data->max_key), c, err, + bkey_after_end_of_btree_node, + "key past end of btree node"); +fsck_err: + return ret; +} + +void bch2_bpos_to_text(struct printbuf *out, struct bpos pos) +{ + if (bpos_eq(pos, POS_MIN)) + prt_printf(out, "POS_MIN"); + else if (bpos_eq(pos, POS_MAX)) + prt_printf(out, "POS_MAX"); + else if (bpos_eq(pos, SPOS_MAX)) + prt_printf(out, "SPOS_MAX"); + else { + if (pos.inode == U64_MAX) + prt_printf(out, "U64_MAX"); + else + prt_printf(out, "%llu", pos.inode); + prt_printf(out, ":"); + if (pos.offset == U64_MAX) + prt_printf(out, "U64_MAX"); + else + prt_printf(out, "%llu", pos.offset); + prt_printf(out, ":"); + if (pos.snapshot == U32_MAX) + prt_printf(out, "U32_MAX"); + else + prt_printf(out, "%u", pos.snapshot); + } +} + +void bch2_bkey_to_text(struct printbuf *out, const struct bkey *k) +{ + if (k) { + prt_printf(out, "u64s %u type ", k->u64s); + + if (k->type < KEY_TYPE_MAX) + prt_printf(out, "%s ", bch2_bkey_types[k->type]); + else + prt_printf(out, "%u ", k->type); + + bch2_bpos_to_text(out, k->p); + + prt_printf(out, " len %u ver %llu", k->size, k->version.lo); + } else { + prt_printf(out, "(null)"); + } +} + +void bch2_val_to_text(struct printbuf *out, struct bch_fs *c, + struct bkey_s_c k) +{ + const struct bkey_ops *ops = bch2_bkey_type_ops(k.k->type); + + if (likely(ops->val_to_text)) + ops->val_to_text(out, c, k); +} + +void bch2_bkey_val_to_text(struct printbuf *out, struct bch_fs *c, + struct bkey_s_c k) +{ + bch2_bkey_to_text(out, k.k); + + if (bkey_val_bytes(k.k)) { + prt_printf(out, ": "); + bch2_val_to_text(out, c, k); + } +} + +void bch2_bkey_swab_val(struct bkey_s k) +{ + const struct bkey_ops *ops = bch2_bkey_type_ops(k.k->type); + + if (ops->swab) + ops->swab(k); +} + +bool bch2_bkey_normalize(struct bch_fs *c, struct bkey_s k) +{ + const struct bkey_ops *ops = bch2_bkey_type_ops(k.k->type); + + return ops->key_normalize + ? ops->key_normalize(c, k) + : false; +} + +bool bch2_bkey_merge(struct bch_fs *c, struct bkey_s l, struct bkey_s_c r) +{ + const struct bkey_ops *ops = bch2_bkey_type_ops(l.k->type); + + return ops->key_merge && + bch2_bkey_maybe_mergable(l.k, r.k) && + (u64) l.k->size + r.k->size <= KEY_SIZE_MAX && + !bch2_key_merging_disabled && + ops->key_merge(c, l, r); +} + +static const struct old_bkey_type { + u8 btree_node_type; + u8 old; + u8 new; +} bkey_renumber_table[] = { + {BKEY_TYPE_btree, 128, KEY_TYPE_btree_ptr }, + {BKEY_TYPE_extents, 128, KEY_TYPE_extent }, + {BKEY_TYPE_extents, 129, KEY_TYPE_extent }, + {BKEY_TYPE_extents, 130, KEY_TYPE_reservation }, + {BKEY_TYPE_inodes, 128, KEY_TYPE_inode }, + {BKEY_TYPE_inodes, 130, KEY_TYPE_inode_generation }, + {BKEY_TYPE_dirents, 128, KEY_TYPE_dirent }, + {BKEY_TYPE_dirents, 129, KEY_TYPE_hash_whiteout }, + {BKEY_TYPE_xattrs, 128, KEY_TYPE_xattr }, + {BKEY_TYPE_xattrs, 129, KEY_TYPE_hash_whiteout }, + {BKEY_TYPE_alloc, 128, KEY_TYPE_alloc }, + {BKEY_TYPE_quotas, 128, KEY_TYPE_quota }, +}; + +void bch2_bkey_renumber(enum btree_node_type btree_node_type, + struct bkey_packed *k, + int write) +{ + const struct old_bkey_type *i; + + for (i = bkey_renumber_table; + i < bkey_renumber_table + ARRAY_SIZE(bkey_renumber_table); + i++) + if (btree_node_type == i->btree_node_type && + k->type == (write ? i->new : i->old)) { + k->type = write ? i->old : i->new; + break; + } +} + +void __bch2_bkey_compat(unsigned level, enum btree_id btree_id, + unsigned version, unsigned big_endian, + int write, + struct bkey_format *f, + struct bkey_packed *k) +{ + const struct bkey_ops *ops; + struct bkey uk; + unsigned nr_compat = 5; + int i; + + /* + * Do these operations in reverse order in the write path: + */ + + for (i = 0; i < nr_compat; i++) + switch (!write ? i : nr_compat - 1 - i) { + case 0: + if (big_endian != CPU_BIG_ENDIAN) + bch2_bkey_swab_key(f, k); + break; + case 1: + if (version < bcachefs_metadata_version_bkey_renumber) + bch2_bkey_renumber(__btree_node_type(level, btree_id), k, write); + break; + case 2: + if (version < bcachefs_metadata_version_inode_btree_change && + btree_id == BTREE_ID_inodes) { + if (!bkey_packed(k)) { + struct bkey_i *u = packed_to_bkey(k); + + swap(u->k.p.inode, u->k.p.offset); + } else if (f->bits_per_field[BKEY_FIELD_INODE] && + f->bits_per_field[BKEY_FIELD_OFFSET]) { + struct bkey_format tmp = *f, *in = f, *out = &tmp; + + swap(tmp.bits_per_field[BKEY_FIELD_INODE], + tmp.bits_per_field[BKEY_FIELD_OFFSET]); + swap(tmp.field_offset[BKEY_FIELD_INODE], + tmp.field_offset[BKEY_FIELD_OFFSET]); + + if (!write) + swap(in, out); + + uk = __bch2_bkey_unpack_key(in, k); + swap(uk.p.inode, uk.p.offset); + BUG_ON(!bch2_bkey_pack_key(k, &uk, out)); + } + } + break; + case 3: + if (version < bcachefs_metadata_version_snapshot && + (level || btree_type_has_snapshots(btree_id))) { + struct bkey_i *u = packed_to_bkey(k); + + if (u) { + u->k.p.snapshot = write + ? 0 : U32_MAX; + } else { + u64 min_packed = le64_to_cpu(f->field_offset[BKEY_FIELD_SNAPSHOT]); + u64 max_packed = min_packed + + ~(~0ULL << f->bits_per_field[BKEY_FIELD_SNAPSHOT]); + + uk = __bch2_bkey_unpack_key(f, k); + uk.p.snapshot = write + ? min_packed : min_t(u64, U32_MAX, max_packed); + + BUG_ON(!bch2_bkey_pack_key(k, &uk, f)); + } + } + + break; + case 4: { + struct bkey_s u; + + if (!bkey_packed(k)) { + u = bkey_i_to_s(packed_to_bkey(k)); + } else { + uk = __bch2_bkey_unpack_key(f, k); + u.k = &uk; + u.v = bkeyp_val(f, k); + } + + if (big_endian != CPU_BIG_ENDIAN) + bch2_bkey_swab_val(u); + + ops = bch2_bkey_type_ops(k->type); + + if (ops->compat) + ops->compat(btree_id, version, big_endian, write, u); + break; + } + default: + BUG(); + } +} |