a0bd30e4ea
Reported-by: syzbot+e5292b50f1957164a4b6@syzkaller.appspotmail.com Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
1119 lines
26 KiB
C
1119 lines
26 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "bcachefs.h"
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#include "bkey.h"
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#include "bkey_cmp.h"
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#include "bkey_methods.h"
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#include "bset.h"
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#include "util.h"
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const struct bkey_format bch2_bkey_format_current = BKEY_FORMAT_CURRENT;
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void bch2_bkey_packed_to_binary_text(struct printbuf *out,
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const struct bkey_format *f,
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const struct bkey_packed *k)
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{
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const u64 *p = high_word(f, k);
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unsigned word_bits = 64 - high_bit_offset;
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unsigned nr_key_bits = bkey_format_key_bits(f) + high_bit_offset;
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u64 v = *p & (~0ULL >> high_bit_offset);
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if (!nr_key_bits) {
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prt_str(out, "(empty)");
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return;
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}
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while (1) {
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unsigned next_key_bits = nr_key_bits;
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if (nr_key_bits < 64) {
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v >>= 64 - nr_key_bits;
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next_key_bits = 0;
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} else {
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next_key_bits -= 64;
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}
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bch2_prt_u64_base2_nbits(out, v, min(word_bits, nr_key_bits));
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if (!next_key_bits)
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break;
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prt_char(out, ' ');
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p = next_word(p);
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v = *p;
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word_bits = 64;
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nr_key_bits = next_key_bits;
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}
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}
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#ifdef CONFIG_BCACHEFS_DEBUG
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static void bch2_bkey_pack_verify(const struct bkey_packed *packed,
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const struct bkey *unpacked,
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const struct bkey_format *format)
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{
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struct bkey tmp;
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BUG_ON(bkeyp_val_u64s(format, packed) !=
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bkey_val_u64s(unpacked));
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BUG_ON(packed->u64s < bkeyp_key_u64s(format, packed));
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tmp = __bch2_bkey_unpack_key(format, packed);
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if (memcmp(&tmp, unpacked, sizeof(struct bkey))) {
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struct printbuf buf = PRINTBUF;
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prt_printf(&buf, "keys differ: format u64s %u fields %u %u %u %u %u\n",
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format->key_u64s,
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format->bits_per_field[0],
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format->bits_per_field[1],
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format->bits_per_field[2],
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format->bits_per_field[3],
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format->bits_per_field[4]);
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prt_printf(&buf, "compiled unpack: ");
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bch2_bkey_to_text(&buf, unpacked);
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prt_newline(&buf);
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prt_printf(&buf, "c unpack: ");
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bch2_bkey_to_text(&buf, &tmp);
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prt_newline(&buf);
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prt_printf(&buf, "compiled unpack: ");
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bch2_bkey_packed_to_binary_text(&buf, &bch2_bkey_format_current,
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(struct bkey_packed *) unpacked);
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prt_newline(&buf);
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prt_printf(&buf, "c unpack: ");
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bch2_bkey_packed_to_binary_text(&buf, &bch2_bkey_format_current,
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(struct bkey_packed *) &tmp);
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prt_newline(&buf);
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panic("%s", buf.buf);
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}
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}
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#else
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static inline void bch2_bkey_pack_verify(const struct bkey_packed *packed,
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const struct bkey *unpacked,
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const struct bkey_format *format) {}
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#endif
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struct pack_state {
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const struct bkey_format *format;
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unsigned bits; /* bits remaining in current word */
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u64 w; /* current word */
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u64 *p; /* pointer to next word */
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};
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__always_inline
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static struct pack_state pack_state_init(const struct bkey_format *format,
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struct bkey_packed *k)
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{
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u64 *p = high_word(format, k);
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return (struct pack_state) {
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.format = format,
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.bits = 64 - high_bit_offset,
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.w = 0,
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.p = p,
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};
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}
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__always_inline
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static void pack_state_finish(struct pack_state *state,
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struct bkey_packed *k)
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{
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EBUG_ON(state->p < k->_data);
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EBUG_ON(state->p >= (u64 *) k->_data + state->format->key_u64s);
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*state->p = state->w;
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}
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struct unpack_state {
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const struct bkey_format *format;
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unsigned bits; /* bits remaining in current word */
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u64 w; /* current word */
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const u64 *p; /* pointer to next word */
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};
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__always_inline
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static struct unpack_state unpack_state_init(const struct bkey_format *format,
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const struct bkey_packed *k)
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{
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const u64 *p = high_word(format, k);
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return (struct unpack_state) {
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.format = format,
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.bits = 64 - high_bit_offset,
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.w = *p << high_bit_offset,
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.p = p,
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};
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}
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__always_inline
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static u64 get_inc_field(struct unpack_state *state, unsigned field)
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{
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unsigned bits = state->format->bits_per_field[field];
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u64 v = 0, offset = le64_to_cpu(state->format->field_offset[field]);
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if (bits >= state->bits) {
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v = state->w >> (64 - bits);
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bits -= state->bits;
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state->p = next_word(state->p);
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state->w = *state->p;
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state->bits = 64;
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}
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/* avoid shift by 64 if bits is 0 - bits is never 64 here: */
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v |= (state->w >> 1) >> (63 - bits);
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state->w <<= bits;
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state->bits -= bits;
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return v + offset;
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}
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__always_inline
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static void __set_inc_field(struct pack_state *state, unsigned field, u64 v)
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{
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unsigned bits = state->format->bits_per_field[field];
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if (bits) {
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if (bits > state->bits) {
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bits -= state->bits;
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/* avoid shift by 64 if bits is 64 - bits is never 0 here: */
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state->w |= (v >> 1) >> (bits - 1);
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*state->p = state->w;
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state->p = next_word(state->p);
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state->w = 0;
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state->bits = 64;
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}
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state->bits -= bits;
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state->w |= v << state->bits;
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}
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}
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__always_inline
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static bool set_inc_field(struct pack_state *state, unsigned field, u64 v)
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{
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unsigned bits = state->format->bits_per_field[field];
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u64 offset = le64_to_cpu(state->format->field_offset[field]);
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if (v < offset)
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return false;
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v -= offset;
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if (fls64(v) > bits)
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return false;
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__set_inc_field(state, field, v);
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return true;
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}
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/*
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* Note: does NOT set out->format (we don't know what it should be here!)
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*
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* Also: doesn't work on extents - it doesn't preserve the invariant that
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* if k is packed bkey_start_pos(k) will successfully pack
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*/
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static bool bch2_bkey_transform_key(const struct bkey_format *out_f,
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struct bkey_packed *out,
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const struct bkey_format *in_f,
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const struct bkey_packed *in)
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{
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struct pack_state out_s = pack_state_init(out_f, out);
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struct unpack_state in_s = unpack_state_init(in_f, in);
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u64 *w = out->_data;
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unsigned i;
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*w = 0;
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for (i = 0; i < BKEY_NR_FIELDS; i++)
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if (!set_inc_field(&out_s, i, get_inc_field(&in_s, i)))
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return false;
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/* Can't happen because the val would be too big to unpack: */
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EBUG_ON(in->u64s - in_f->key_u64s + out_f->key_u64s > U8_MAX);
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pack_state_finish(&out_s, out);
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out->u64s = out_f->key_u64s + in->u64s - in_f->key_u64s;
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out->needs_whiteout = in->needs_whiteout;
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out->type = in->type;
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return true;
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}
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bool bch2_bkey_transform(const struct bkey_format *out_f,
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struct bkey_packed *out,
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const struct bkey_format *in_f,
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const struct bkey_packed *in)
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{
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if (!bch2_bkey_transform_key(out_f, out, in_f, in))
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return false;
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memcpy_u64s((u64 *) out + out_f->key_u64s,
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(u64 *) in + in_f->key_u64s,
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(in->u64s - in_f->key_u64s));
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return true;
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}
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struct bkey __bch2_bkey_unpack_key(const struct bkey_format *format,
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const struct bkey_packed *in)
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{
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struct unpack_state state = unpack_state_init(format, in);
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struct bkey out;
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EBUG_ON(format->nr_fields != BKEY_NR_FIELDS);
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EBUG_ON(in->u64s < format->key_u64s);
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EBUG_ON(in->format != KEY_FORMAT_LOCAL_BTREE);
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EBUG_ON(in->u64s - format->key_u64s + BKEY_U64s > U8_MAX);
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out.u64s = BKEY_U64s + in->u64s - format->key_u64s;
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out.format = KEY_FORMAT_CURRENT;
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out.needs_whiteout = in->needs_whiteout;
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out.type = in->type;
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out.pad[0] = 0;
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#define x(id, field) out.field = get_inc_field(&state, id);
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bkey_fields()
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#undef x
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return out;
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}
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#ifndef HAVE_BCACHEFS_COMPILED_UNPACK
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struct bpos __bkey_unpack_pos(const struct bkey_format *format,
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const struct bkey_packed *in)
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{
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struct unpack_state state = unpack_state_init(format, in);
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struct bpos out;
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EBUG_ON(format->nr_fields != BKEY_NR_FIELDS);
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EBUG_ON(in->u64s < format->key_u64s);
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EBUG_ON(in->format != KEY_FORMAT_LOCAL_BTREE);
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out.inode = get_inc_field(&state, BKEY_FIELD_INODE);
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out.offset = get_inc_field(&state, BKEY_FIELD_OFFSET);
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out.snapshot = get_inc_field(&state, BKEY_FIELD_SNAPSHOT);
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return out;
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}
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#endif
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/**
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* bch2_bkey_pack_key -- pack just the key, not the value
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* @out: packed result
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* @in: key to pack
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* @format: format of packed result
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*
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* Returns: true on success, false on failure
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*/
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bool bch2_bkey_pack_key(struct bkey_packed *out, const struct bkey *in,
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const struct bkey_format *format)
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{
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struct pack_state state = pack_state_init(format, out);
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u64 *w = out->_data;
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EBUG_ON((void *) in == (void *) out);
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EBUG_ON(format->nr_fields != BKEY_NR_FIELDS);
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EBUG_ON(in->format != KEY_FORMAT_CURRENT);
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*w = 0;
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#define x(id, field) if (!set_inc_field(&state, id, in->field)) return false;
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bkey_fields()
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#undef x
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pack_state_finish(&state, out);
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out->u64s = format->key_u64s + in->u64s - BKEY_U64s;
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out->format = KEY_FORMAT_LOCAL_BTREE;
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out->needs_whiteout = in->needs_whiteout;
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out->type = in->type;
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bch2_bkey_pack_verify(out, in, format);
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return true;
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}
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/**
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* bch2_bkey_unpack -- unpack the key and the value
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* @b: btree node of @src key (for packed format)
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* @dst: unpacked result
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* @src: packed input
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*/
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void bch2_bkey_unpack(const struct btree *b, struct bkey_i *dst,
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const struct bkey_packed *src)
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{
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__bkey_unpack_key(b, &dst->k, src);
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memcpy_u64s(&dst->v,
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bkeyp_val(&b->format, src),
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bkeyp_val_u64s(&b->format, src));
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}
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/**
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* bch2_bkey_pack -- pack the key and the value
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* @dst: packed result
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* @src: unpacked input
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* @format: format of packed result
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*
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* Returns: true on success, false on failure
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*/
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bool bch2_bkey_pack(struct bkey_packed *dst, const struct bkey_i *src,
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const struct bkey_format *format)
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{
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struct bkey_packed tmp;
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if (!bch2_bkey_pack_key(&tmp, &src->k, format))
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return false;
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memmove_u64s((u64 *) dst + format->key_u64s,
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&src->v,
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bkey_val_u64s(&src->k));
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memcpy_u64s_small(dst, &tmp, format->key_u64s);
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return true;
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}
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__always_inline
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static bool set_inc_field_lossy(struct pack_state *state, unsigned field, u64 v)
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{
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unsigned bits = state->format->bits_per_field[field];
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u64 offset = le64_to_cpu(state->format->field_offset[field]);
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bool ret = true;
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EBUG_ON(v < offset);
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v -= offset;
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if (fls64(v) > bits) {
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v = ~(~0ULL << bits);
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ret = false;
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}
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__set_inc_field(state, field, v);
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return ret;
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}
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#ifdef CONFIG_BCACHEFS_DEBUG
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static bool bkey_packed_successor(struct bkey_packed *out,
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const struct btree *b,
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struct bkey_packed k)
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{
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const struct bkey_format *f = &b->format;
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unsigned nr_key_bits = b->nr_key_bits;
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unsigned first_bit, offset;
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u64 *p;
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EBUG_ON(b->nr_key_bits != bkey_format_key_bits(f));
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if (!nr_key_bits)
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return false;
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*out = k;
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first_bit = high_bit_offset + nr_key_bits - 1;
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p = nth_word(high_word(f, out), first_bit >> 6);
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offset = 63 - (first_bit & 63);
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while (nr_key_bits) {
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unsigned bits = min(64 - offset, nr_key_bits);
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u64 mask = (~0ULL >> (64 - bits)) << offset;
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if ((*p & mask) != mask) {
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*p += 1ULL << offset;
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EBUG_ON(bch2_bkey_cmp_packed(b, out, &k) <= 0);
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return true;
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}
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*p &= ~mask;
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p = prev_word(p);
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nr_key_bits -= bits;
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offset = 0;
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}
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return false;
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}
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static bool bkey_format_has_too_big_fields(const struct bkey_format *f)
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{
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for (unsigned i = 0; i < f->nr_fields; i++) {
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unsigned unpacked_bits = bch2_bkey_format_current.bits_per_field[i];
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u64 unpacked_max = ~((~0ULL << 1) << (unpacked_bits - 1));
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u64 packed_max = f->bits_per_field[i]
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? ~((~0ULL << 1) << (f->bits_per_field[i] - 1))
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: 0;
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u64 field_offset = le64_to_cpu(f->field_offset[i]);
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if (packed_max + field_offset < packed_max ||
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packed_max + field_offset > unpacked_max)
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return true;
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}
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return false;
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}
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#endif
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/*
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* Returns a packed key that compares <= in
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*
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* This is used in bset_search_tree(), where we need a packed pos in order to be
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* able to compare against the keys in the auxiliary search tree - and it's
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* legal to use a packed pos that isn't equivalent to the original pos,
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* _provided_ it compares <= to the original pos.
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*/
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enum bkey_pack_pos_ret bch2_bkey_pack_pos_lossy(struct bkey_packed *out,
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struct bpos in,
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const struct btree *b)
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{
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const struct bkey_format *f = &b->format;
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struct pack_state state = pack_state_init(f, out);
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u64 *w = out->_data;
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#ifdef CONFIG_BCACHEFS_DEBUG
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struct bpos orig = in;
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#endif
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bool exact = true;
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unsigned i;
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/*
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* bch2_bkey_pack_key() will write to all of f->key_u64s, minus the 3
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* byte header, but pack_pos() won't if the len/version fields are big
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* enough - we need to make sure to zero them out:
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*/
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for (i = 0; i < f->key_u64s; i++)
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w[i] = 0;
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if (unlikely(in.snapshot <
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le64_to_cpu(f->field_offset[BKEY_FIELD_SNAPSHOT]))) {
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if (!in.offset-- &&
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!in.inode--)
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return BKEY_PACK_POS_FAIL;
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in.snapshot = KEY_SNAPSHOT_MAX;
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exact = false;
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}
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if (unlikely(in.offset <
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le64_to_cpu(f->field_offset[BKEY_FIELD_OFFSET]))) {
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if (!in.inode--)
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return BKEY_PACK_POS_FAIL;
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in.offset = KEY_OFFSET_MAX;
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in.snapshot = KEY_SNAPSHOT_MAX;
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exact = false;
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}
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if (unlikely(in.inode <
|
|
le64_to_cpu(f->field_offset[BKEY_FIELD_INODE])))
|
|
return BKEY_PACK_POS_FAIL;
|
|
|
|
if (unlikely(!set_inc_field_lossy(&state, BKEY_FIELD_INODE, in.inode))) {
|
|
in.offset = KEY_OFFSET_MAX;
|
|
in.snapshot = KEY_SNAPSHOT_MAX;
|
|
exact = false;
|
|
}
|
|
|
|
if (unlikely(!set_inc_field_lossy(&state, BKEY_FIELD_OFFSET, in.offset))) {
|
|
in.snapshot = KEY_SNAPSHOT_MAX;
|
|
exact = false;
|
|
}
|
|
|
|
if (unlikely(!set_inc_field_lossy(&state, BKEY_FIELD_SNAPSHOT, in.snapshot)))
|
|
exact = false;
|
|
|
|
pack_state_finish(&state, out);
|
|
out->u64s = f->key_u64s;
|
|
out->format = KEY_FORMAT_LOCAL_BTREE;
|
|
out->type = KEY_TYPE_deleted;
|
|
|
|
#ifdef CONFIG_BCACHEFS_DEBUG
|
|
if (exact) {
|
|
BUG_ON(bkey_cmp_left_packed(b, out, &orig));
|
|
} else {
|
|
struct bkey_packed successor;
|
|
|
|
BUG_ON(bkey_cmp_left_packed(b, out, &orig) >= 0);
|
|
BUG_ON(bkey_packed_successor(&successor, b, *out) &&
|
|
bkey_cmp_left_packed(b, &successor, &orig) < 0 &&
|
|
!bkey_format_has_too_big_fields(f));
|
|
}
|
|
#endif
|
|
|
|
return exact ? BKEY_PACK_POS_EXACT : BKEY_PACK_POS_SMALLER;
|
|
}
|
|
|
|
void bch2_bkey_format_init(struct bkey_format_state *s)
|
|
{
|
|
unsigned i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(s->field_min); i++)
|
|
s->field_min[i] = U64_MAX;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(s->field_max); i++)
|
|
s->field_max[i] = 0;
|
|
|
|
/* Make sure we can store a size of 0: */
|
|
s->field_min[BKEY_FIELD_SIZE] = 0;
|
|
}
|
|
|
|
void bch2_bkey_format_add_pos(struct bkey_format_state *s, struct bpos p)
|
|
{
|
|
unsigned field = 0;
|
|
|
|
__bkey_format_add(s, field++, p.inode);
|
|
__bkey_format_add(s, field++, p.offset);
|
|
__bkey_format_add(s, field++, p.snapshot);
|
|
}
|
|
|
|
/*
|
|
* We don't want it to be possible for the packed format to represent fields
|
|
* bigger than a u64... that will cause confusion and issues (like with
|
|
* bkey_packed_successor())
|
|
*/
|
|
static void set_format_field(struct bkey_format *f, enum bch_bkey_fields i,
|
|
unsigned bits, u64 offset)
|
|
{
|
|
unsigned unpacked_bits = bch2_bkey_format_current.bits_per_field[i];
|
|
u64 unpacked_max = ~((~0ULL << 1) << (unpacked_bits - 1));
|
|
|
|
bits = min(bits, unpacked_bits);
|
|
|
|
offset = bits == unpacked_bits ? 0 : min(offset, unpacked_max - ((1ULL << bits) - 1));
|
|
|
|
f->bits_per_field[i] = bits;
|
|
f->field_offset[i] = cpu_to_le64(offset);
|
|
}
|
|
|
|
struct bkey_format bch2_bkey_format_done(struct bkey_format_state *s)
|
|
{
|
|
unsigned i, bits = KEY_PACKED_BITS_START;
|
|
struct bkey_format ret = {
|
|
.nr_fields = BKEY_NR_FIELDS,
|
|
};
|
|
|
|
for (i = 0; i < ARRAY_SIZE(s->field_min); i++) {
|
|
s->field_min[i] = min(s->field_min[i], s->field_max[i]);
|
|
|
|
set_format_field(&ret, i,
|
|
fls64(s->field_max[i] - s->field_min[i]),
|
|
s->field_min[i]);
|
|
|
|
bits += ret.bits_per_field[i];
|
|
}
|
|
|
|
/* allow for extent merging: */
|
|
if (ret.bits_per_field[BKEY_FIELD_SIZE]) {
|
|
unsigned b = min(4U, 32U - ret.bits_per_field[BKEY_FIELD_SIZE]);
|
|
|
|
ret.bits_per_field[BKEY_FIELD_SIZE] += b;
|
|
bits += b;
|
|
}
|
|
|
|
ret.key_u64s = DIV_ROUND_UP(bits, 64);
|
|
|
|
/* if we have enough spare bits, round fields up to nearest byte */
|
|
bits = ret.key_u64s * 64 - bits;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(ret.bits_per_field); i++) {
|
|
unsigned r = round_up(ret.bits_per_field[i], 8) -
|
|
ret.bits_per_field[i];
|
|
|
|
if (r <= bits) {
|
|
set_format_field(&ret, i,
|
|
ret.bits_per_field[i] + r,
|
|
le64_to_cpu(ret.field_offset[i]));
|
|
bits -= r;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_BCACHEFS_DEBUG
|
|
{
|
|
struct printbuf buf = PRINTBUF;
|
|
|
|
BUG_ON(bch2_bkey_format_invalid(NULL, &ret, 0, &buf));
|
|
printbuf_exit(&buf);
|
|
}
|
|
#endif
|
|
return ret;
|
|
}
|
|
|
|
int bch2_bkey_format_invalid(struct bch_fs *c,
|
|
struct bkey_format *f,
|
|
enum bch_validate_flags flags,
|
|
struct printbuf *err)
|
|
{
|
|
unsigned i, bits = KEY_PACKED_BITS_START;
|
|
|
|
if (f->nr_fields != BKEY_NR_FIELDS) {
|
|
prt_printf(err, "incorrect number of fields: got %u, should be %u",
|
|
f->nr_fields, BKEY_NR_FIELDS);
|
|
return -BCH_ERR_invalid;
|
|
}
|
|
|
|
/*
|
|
* Verify that the packed format can't represent fields larger than the
|
|
* unpacked format:
|
|
*/
|
|
for (i = 0; i < f->nr_fields; i++) {
|
|
if ((!c || c->sb.version_min >= bcachefs_metadata_version_snapshot) &&
|
|
bch2_bkey_format_field_overflows(f, i)) {
|
|
unsigned unpacked_bits = bch2_bkey_format_current.bits_per_field[i];
|
|
u64 unpacked_max = ~((~0ULL << 1) << (unpacked_bits - 1));
|
|
unsigned packed_bits = min(64, f->bits_per_field[i]);
|
|
u64 packed_max = packed_bits
|
|
? ~((~0ULL << 1) << (packed_bits - 1))
|
|
: 0;
|
|
|
|
prt_printf(err, "field %u too large: %llu + %llu > %llu",
|
|
i, packed_max, le64_to_cpu(f->field_offset[i]), unpacked_max);
|
|
return -BCH_ERR_invalid;
|
|
}
|
|
|
|
bits += f->bits_per_field[i];
|
|
}
|
|
|
|
if (f->key_u64s != DIV_ROUND_UP(bits, 64)) {
|
|
prt_printf(err, "incorrect key_u64s: got %u, should be %u",
|
|
f->key_u64s, DIV_ROUND_UP(bits, 64));
|
|
return -BCH_ERR_invalid;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
void bch2_bkey_format_to_text(struct printbuf *out, const struct bkey_format *f)
|
|
{
|
|
prt_printf(out, "u64s %u fields ", f->key_u64s);
|
|
|
|
for (unsigned i = 0; i < ARRAY_SIZE(f->bits_per_field); i++) {
|
|
if (i)
|
|
prt_str(out, ", ");
|
|
prt_printf(out, "%u:%llu",
|
|
f->bits_per_field[i],
|
|
le64_to_cpu(f->field_offset[i]));
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Most significant differing bit
|
|
* Bits are indexed from 0 - return is [0, nr_key_bits)
|
|
*/
|
|
__pure
|
|
unsigned bch2_bkey_greatest_differing_bit(const struct btree *b,
|
|
const struct bkey_packed *l_k,
|
|
const struct bkey_packed *r_k)
|
|
{
|
|
const u64 *l = high_word(&b->format, l_k);
|
|
const u64 *r = high_word(&b->format, r_k);
|
|
unsigned nr_key_bits = b->nr_key_bits;
|
|
unsigned word_bits = 64 - high_bit_offset;
|
|
u64 l_v, r_v;
|
|
|
|
EBUG_ON(b->nr_key_bits != bkey_format_key_bits(&b->format));
|
|
|
|
/* for big endian, skip past header */
|
|
l_v = *l & (~0ULL >> high_bit_offset);
|
|
r_v = *r & (~0ULL >> high_bit_offset);
|
|
|
|
while (nr_key_bits) {
|
|
if (nr_key_bits < word_bits) {
|
|
l_v >>= word_bits - nr_key_bits;
|
|
r_v >>= word_bits - nr_key_bits;
|
|
nr_key_bits = 0;
|
|
} else {
|
|
nr_key_bits -= word_bits;
|
|
}
|
|
|
|
if (l_v != r_v)
|
|
return fls64(l_v ^ r_v) - 1 + nr_key_bits;
|
|
|
|
l = next_word(l);
|
|
r = next_word(r);
|
|
|
|
l_v = *l;
|
|
r_v = *r;
|
|
word_bits = 64;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
/*
|
|
* First set bit
|
|
* Bits are indexed from 0 - return is [0, nr_key_bits)
|
|
*/
|
|
__pure
|
|
unsigned bch2_bkey_ffs(const struct btree *b, const struct bkey_packed *k)
|
|
{
|
|
const u64 *p = high_word(&b->format, k);
|
|
unsigned nr_key_bits = b->nr_key_bits;
|
|
unsigned ret = 0, offset;
|
|
|
|
EBUG_ON(b->nr_key_bits != bkey_format_key_bits(&b->format));
|
|
|
|
offset = nr_key_bits;
|
|
while (offset > 64) {
|
|
p = next_word(p);
|
|
offset -= 64;
|
|
}
|
|
|
|
offset = 64 - offset;
|
|
|
|
while (nr_key_bits) {
|
|
unsigned bits = nr_key_bits + offset < 64
|
|
? nr_key_bits
|
|
: 64 - offset;
|
|
|
|
u64 mask = (~0ULL >> (64 - bits)) << offset;
|
|
|
|
if (*p & mask)
|
|
return ret + __ffs64(*p & mask) - offset;
|
|
|
|
p = prev_word(p);
|
|
nr_key_bits -= bits;
|
|
ret += bits;
|
|
offset = 0;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
#ifdef HAVE_BCACHEFS_COMPILED_UNPACK
|
|
|
|
#define I(_x) (*(out)++ = (_x))
|
|
#define I1(i0) I(i0)
|
|
#define I2(i0, i1) (I1(i0), I(i1))
|
|
#define I3(i0, i1, i2) (I2(i0, i1), I(i2))
|
|
#define I4(i0, i1, i2, i3) (I3(i0, i1, i2), I(i3))
|
|
#define I5(i0, i1, i2, i3, i4) (I4(i0, i1, i2, i3), I(i4))
|
|
|
|
static u8 *compile_bkey_field(const struct bkey_format *format, u8 *out,
|
|
enum bch_bkey_fields field,
|
|
unsigned dst_offset, unsigned dst_size,
|
|
bool *eax_zeroed)
|
|
{
|
|
unsigned bits = format->bits_per_field[field];
|
|
u64 offset = le64_to_cpu(format->field_offset[field]);
|
|
unsigned i, byte, bit_offset, align, shl, shr;
|
|
|
|
if (!bits && !offset) {
|
|
if (!*eax_zeroed) {
|
|
/* xor eax, eax */
|
|
I2(0x31, 0xc0);
|
|
}
|
|
|
|
*eax_zeroed = true;
|
|
goto set_field;
|
|
}
|
|
|
|
if (!bits) {
|
|
/* just return offset: */
|
|
|
|
switch (dst_size) {
|
|
case 8:
|
|
if (offset > S32_MAX) {
|
|
/* mov [rdi + dst_offset], offset */
|
|
I3(0xc7, 0x47, dst_offset);
|
|
memcpy(out, &offset, 4);
|
|
out += 4;
|
|
|
|
I3(0xc7, 0x47, dst_offset + 4);
|
|
memcpy(out, (void *) &offset + 4, 4);
|
|
out += 4;
|
|
} else {
|
|
/* mov [rdi + dst_offset], offset */
|
|
/* sign extended */
|
|
I4(0x48, 0xc7, 0x47, dst_offset);
|
|
memcpy(out, &offset, 4);
|
|
out += 4;
|
|
}
|
|
break;
|
|
case 4:
|
|
/* mov [rdi + dst_offset], offset */
|
|
I3(0xc7, 0x47, dst_offset);
|
|
memcpy(out, &offset, 4);
|
|
out += 4;
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
return out;
|
|
}
|
|
|
|
bit_offset = format->key_u64s * 64;
|
|
for (i = 0; i <= field; i++)
|
|
bit_offset -= format->bits_per_field[i];
|
|
|
|
byte = bit_offset / 8;
|
|
bit_offset -= byte * 8;
|
|
|
|
*eax_zeroed = false;
|
|
|
|
if (bit_offset == 0 && bits == 8) {
|
|
/* movzx eax, BYTE PTR [rsi + imm8] */
|
|
I4(0x0f, 0xb6, 0x46, byte);
|
|
} else if (bit_offset == 0 && bits == 16) {
|
|
/* movzx eax, WORD PTR [rsi + imm8] */
|
|
I4(0x0f, 0xb7, 0x46, byte);
|
|
} else if (bit_offset + bits <= 32) {
|
|
align = min(4 - DIV_ROUND_UP(bit_offset + bits, 8), byte & 3);
|
|
byte -= align;
|
|
bit_offset += align * 8;
|
|
|
|
BUG_ON(bit_offset + bits > 32);
|
|
|
|
/* mov eax, [rsi + imm8] */
|
|
I3(0x8b, 0x46, byte);
|
|
|
|
if (bit_offset) {
|
|
/* shr eax, imm8 */
|
|
I3(0xc1, 0xe8, bit_offset);
|
|
}
|
|
|
|
if (bit_offset + bits < 32) {
|
|
unsigned mask = ~0U >> (32 - bits);
|
|
|
|
/* and eax, imm32 */
|
|
I1(0x25);
|
|
memcpy(out, &mask, 4);
|
|
out += 4;
|
|
}
|
|
} else if (bit_offset + bits <= 64) {
|
|
align = min(8 - DIV_ROUND_UP(bit_offset + bits, 8), byte & 7);
|
|
byte -= align;
|
|
bit_offset += align * 8;
|
|
|
|
BUG_ON(bit_offset + bits > 64);
|
|
|
|
/* mov rax, [rsi + imm8] */
|
|
I4(0x48, 0x8b, 0x46, byte);
|
|
|
|
shl = 64 - bit_offset - bits;
|
|
shr = bit_offset + shl;
|
|
|
|
if (shl) {
|
|
/* shl rax, imm8 */
|
|
I4(0x48, 0xc1, 0xe0, shl);
|
|
}
|
|
|
|
if (shr) {
|
|
/* shr rax, imm8 */
|
|
I4(0x48, 0xc1, 0xe8, shr);
|
|
}
|
|
} else {
|
|
align = min(4 - DIV_ROUND_UP(bit_offset + bits, 8), byte & 3);
|
|
byte -= align;
|
|
bit_offset += align * 8;
|
|
|
|
BUG_ON(bit_offset + bits > 96);
|
|
|
|
/* mov rax, [rsi + byte] */
|
|
I4(0x48, 0x8b, 0x46, byte);
|
|
|
|
/* mov edx, [rsi + byte + 8] */
|
|
I3(0x8b, 0x56, byte + 8);
|
|
|
|
/* bits from next word: */
|
|
shr = bit_offset + bits - 64;
|
|
BUG_ON(shr > bit_offset);
|
|
|
|
/* shr rax, bit_offset */
|
|
I4(0x48, 0xc1, 0xe8, shr);
|
|
|
|
/* shl rdx, imm8 */
|
|
I4(0x48, 0xc1, 0xe2, 64 - shr);
|
|
|
|
/* or rax, rdx */
|
|
I3(0x48, 0x09, 0xd0);
|
|
|
|
shr = bit_offset - shr;
|
|
|
|
if (shr) {
|
|
/* shr rax, imm8 */
|
|
I4(0x48, 0xc1, 0xe8, shr);
|
|
}
|
|
}
|
|
|
|
/* rax += offset: */
|
|
if (offset > S32_MAX) {
|
|
/* mov rdx, imm64 */
|
|
I2(0x48, 0xba);
|
|
memcpy(out, &offset, 8);
|
|
out += 8;
|
|
/* add %rdx, %rax */
|
|
I3(0x48, 0x01, 0xd0);
|
|
} else if (offset + (~0ULL >> (64 - bits)) > U32_MAX) {
|
|
/* add rax, imm32 */
|
|
I2(0x48, 0x05);
|
|
memcpy(out, &offset, 4);
|
|
out += 4;
|
|
} else if (offset) {
|
|
/* add eax, imm32 */
|
|
I1(0x05);
|
|
memcpy(out, &offset, 4);
|
|
out += 4;
|
|
}
|
|
set_field:
|
|
switch (dst_size) {
|
|
case 8:
|
|
/* mov [rdi + dst_offset], rax */
|
|
I4(0x48, 0x89, 0x47, dst_offset);
|
|
break;
|
|
case 4:
|
|
/* mov [rdi + dst_offset], eax */
|
|
I3(0x89, 0x47, dst_offset);
|
|
break;
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
return out;
|
|
}
|
|
|
|
int bch2_compile_bkey_format(const struct bkey_format *format, void *_out)
|
|
{
|
|
bool eax_zeroed = false;
|
|
u8 *out = _out;
|
|
|
|
/*
|
|
* rdi: dst - unpacked key
|
|
* rsi: src - packed key
|
|
*/
|
|
|
|
/* k->u64s, k->format, k->type */
|
|
|
|
/* mov eax, [rsi] */
|
|
I2(0x8b, 0x06);
|
|
|
|
/* add eax, BKEY_U64s - format->key_u64s */
|
|
I5(0x05, BKEY_U64s - format->key_u64s, KEY_FORMAT_CURRENT, 0, 0);
|
|
|
|
/* and eax, imm32: mask out k->pad: */
|
|
I5(0x25, 0xff, 0xff, 0xff, 0);
|
|
|
|
/* mov [rdi], eax */
|
|
I2(0x89, 0x07);
|
|
|
|
#define x(id, field) \
|
|
out = compile_bkey_field(format, out, id, \
|
|
offsetof(struct bkey, field), \
|
|
sizeof(((struct bkey *) NULL)->field), \
|
|
&eax_zeroed);
|
|
bkey_fields()
|
|
#undef x
|
|
|
|
/* retq */
|
|
I1(0xc3);
|
|
|
|
return (void *) out - _out;
|
|
}
|
|
|
|
#else
|
|
#endif
|
|
|
|
__pure
|
|
int __bch2_bkey_cmp_packed_format_checked(const struct bkey_packed *l,
|
|
const struct bkey_packed *r,
|
|
const struct btree *b)
|
|
{
|
|
return __bch2_bkey_cmp_packed_format_checked_inlined(l, r, b);
|
|
}
|
|
|
|
__pure __flatten
|
|
int __bch2_bkey_cmp_left_packed_format_checked(const struct btree *b,
|
|
const struct bkey_packed *l,
|
|
const struct bpos *r)
|
|
{
|
|
return bpos_cmp(bkey_unpack_pos_format_checked(b, l), *r);
|
|
}
|
|
|
|
__pure __flatten
|
|
int bch2_bkey_cmp_packed(const struct btree *b,
|
|
const struct bkey_packed *l,
|
|
const struct bkey_packed *r)
|
|
{
|
|
return bch2_bkey_cmp_packed_inlined(b, l, r);
|
|
}
|
|
|
|
__pure __flatten
|
|
int __bch2_bkey_cmp_left_packed(const struct btree *b,
|
|
const struct bkey_packed *l,
|
|
const struct bpos *r)
|
|
{
|
|
const struct bkey *l_unpacked;
|
|
|
|
return unlikely(l_unpacked = packed_to_bkey_c(l))
|
|
? bpos_cmp(l_unpacked->p, *r)
|
|
: __bch2_bkey_cmp_left_packed_format_checked(b, l, r);
|
|
}
|
|
|
|
void bch2_bpos_swab(struct bpos *p)
|
|
{
|
|
u8 *l = (u8 *) p;
|
|
u8 *h = ((u8 *) &p[1]) - 1;
|
|
|
|
while (l < h) {
|
|
swap(*l, *h);
|
|
l++;
|
|
--h;
|
|
}
|
|
}
|
|
|
|
void bch2_bkey_swab_key(const struct bkey_format *_f, struct bkey_packed *k)
|
|
{
|
|
const struct bkey_format *f = bkey_packed(k) ? _f : &bch2_bkey_format_current;
|
|
u8 *l = k->key_start;
|
|
u8 *h = (u8 *) ((u64 *) k->_data + f->key_u64s) - 1;
|
|
|
|
while (l < h) {
|
|
swap(*l, *h);
|
|
l++;
|
|
--h;
|
|
}
|
|
}
|
|
|
|
#ifdef CONFIG_BCACHEFS_DEBUG
|
|
void bch2_bkey_pack_test(void)
|
|
{
|
|
struct bkey t = KEY(4134ULL, 1250629070527416633ULL, 0);
|
|
struct bkey_packed p;
|
|
|
|
struct bkey_format test_format = {
|
|
.key_u64s = 3,
|
|
.nr_fields = BKEY_NR_FIELDS,
|
|
.bits_per_field = {
|
|
13,
|
|
64,
|
|
32,
|
|
},
|
|
};
|
|
|
|
struct unpack_state in_s =
|
|
unpack_state_init(&bch2_bkey_format_current, (void *) &t);
|
|
struct pack_state out_s = pack_state_init(&test_format, &p);
|
|
unsigned i;
|
|
|
|
for (i = 0; i < out_s.format->nr_fields; i++) {
|
|
u64 a, v = get_inc_field(&in_s, i);
|
|
|
|
switch (i) {
|
|
#define x(id, field) case id: a = t.field; break;
|
|
bkey_fields()
|
|
#undef x
|
|
default:
|
|
BUG();
|
|
}
|
|
|
|
if (a != v)
|
|
panic("got %llu actual %llu i %u\n", v, a, i);
|
|
|
|
if (!set_inc_field(&out_s, i, v))
|
|
panic("failed at %u\n", i);
|
|
}
|
|
|
|
BUG_ON(!bch2_bkey_pack_key(&p, &t, &test_format));
|
|
}
|
|
#endif
|