#include <linux/dcache.h>
-unsigned bch2_dirent_name_bytes(struct bkey_s_c_dirent d)
+static unsigned bch2_dirent_name_bytes(struct bkey_s_c_dirent d)
{
- unsigned len = bkey_val_bytes(d.k) -
- offsetof(struct bch_dirent, d_name);
+ unsigned bkey_u64s = bkey_val_u64s(d.k);
+ unsigned bkey_bytes = bkey_u64s * sizeof(u64);
+ u64 last_u64 = ((u64*)d.v)[bkey_u64s - 1];
+#if CPU_BIG_ENDIAN
+ unsigned trailing_nuls = last_u64 ? __builtin_ctzll(last_u64) / 8 : 64 / 8;
+#else
+ unsigned trailing_nuls = last_u64 ? __builtin_clzll(last_u64) / 8 : 64 / 8;
+#endif
+
+ return bkey_bytes -
+ offsetof(struct bch_dirent, d_name) -
+ trailing_nuls;
+}
- return strnlen(d.v->d_name, len);
+struct qstr bch2_dirent_get_name(struct bkey_s_c_dirent d)
+{
+ return (struct qstr) QSTR_INIT(d.v->d_name, bch2_dirent_name_bytes(d));
}
static u64 bch2_dirent_hash(const struct bch_hash_info *info,
static u64 dirent_hash_bkey(const struct bch_hash_info *info, struct bkey_s_c k)
{
struct bkey_s_c_dirent d = bkey_s_c_to_dirent(k);
- struct qstr name = QSTR_INIT(d.v->d_name, bch2_dirent_name_bytes(d));
+ struct qstr name = bch2_dirent_get_name(d);
return bch2_dirent_hash(info, &name);
}
static bool dirent_cmp_key(struct bkey_s_c _l, const void *_r)
{
struct bkey_s_c_dirent l = bkey_s_c_to_dirent(_l);
- int len = bch2_dirent_name_bytes(l);
- const struct qstr *r = _r;
+ const struct qstr l_name = bch2_dirent_get_name(l);
+ const struct qstr *r_name = _r;
- return len - r->len ?: memcmp(l.v->d_name, r->name, len);
+ return l_name.len - r_name->len ?: memcmp(l_name.name, r_name->name, l_name.len);
}
static bool dirent_cmp_bkey(struct bkey_s_c _l, struct bkey_s_c _r)
{
struct bkey_s_c_dirent l = bkey_s_c_to_dirent(_l);
struct bkey_s_c_dirent r = bkey_s_c_to_dirent(_r);
- int l_len = bch2_dirent_name_bytes(l);
- int r_len = bch2_dirent_name_bytes(r);
+ const struct qstr l_name = bch2_dirent_get_name(l);
+ const struct qstr r_name = bch2_dirent_get_name(r);
- return l_len - r_len ?: memcmp(l.v->d_name, r.v->d_name, l_len);
+ return l_name.len - r_name.len ?: memcmp(l_name.name, r_name.name, l_name.len);
}
static bool dirent_is_visible(subvol_inum inum, struct bkey_s_c k)
.is_visible = dirent_is_visible,
};
-int bch2_dirent_invalid(const struct bch_fs *c, struct bkey_s_c k,
+int bch2_dirent_invalid(struct bch_fs *c, struct bkey_s_c k,
enum bkey_invalid_flags flags,
struct printbuf *err)
{
struct bkey_s_c_dirent d = bkey_s_c_to_dirent(k);
- unsigned len;
-
- len = bch2_dirent_name_bytes(d);
- if (!len) {
- prt_printf(err, "empty name");
- return -BCH_ERR_invalid_bkey;
- }
-
- if (bkey_val_u64s(k.k) > dirent_val_u64s(len)) {
- prt_printf(err, "value too big (%zu > %u)",
- bkey_val_u64s(k.k), dirent_val_u64s(len));
- return -BCH_ERR_invalid_bkey;
- }
-
- if (len > BCH_NAME_MAX) {
- prt_printf(err, "dirent name too big (%u > %u)",
- len, BCH_NAME_MAX);
- return -BCH_ERR_invalid_bkey;
- }
-
- if (len == 1 && !memcmp(d.v->d_name, ".", 1)) {
- prt_printf(err, "invalid name");
- return -BCH_ERR_invalid_bkey;
- }
-
- if (len == 2 && !memcmp(d.v->d_name, "..", 2)) {
- prt_printf(err, "invalid name");
- return -BCH_ERR_invalid_bkey;
- }
+ struct qstr d_name = bch2_dirent_get_name(d);
+ int ret = 0;
- if (memchr(d.v->d_name, '/', len)) {
- prt_printf(err, "invalid name");
- return -BCH_ERR_invalid_bkey;
- }
+ bkey_fsck_err_on(!d_name.len, c, err,
+ dirent_empty_name,
+ "empty name");
- if (d.v->d_type != DT_SUBVOL &&
- le64_to_cpu(d.v->d_inum) == d.k->p.inode) {
- prt_printf(err, "dirent points to own directory");
- return -BCH_ERR_invalid_bkey;
- }
+ bkey_fsck_err_on(bkey_val_u64s(k.k) > dirent_val_u64s(d_name.len), c, err,
+ dirent_val_too_big,
+ "value too big (%zu > %u)",
+ bkey_val_u64s(k.k), dirent_val_u64s(d_name.len));
- return 0;
+ /*
+ * Check new keys don't exceed the max length
+ * (older keys may be larger.)
+ */
+ bkey_fsck_err_on((flags & BKEY_INVALID_COMMIT) && d_name.len > BCH_NAME_MAX, c, err,
+ dirent_name_too_long,
+ "dirent name too big (%u > %u)",
+ d_name.len, BCH_NAME_MAX);
+
+ bkey_fsck_err_on(d_name.len != strnlen(d_name.name, d_name.len), c, err,
+ dirent_name_embedded_nul,
+ "dirent has stray data after name's NUL");
+
+ bkey_fsck_err_on((d_name.len == 1 && !memcmp(d_name.name, ".", 1)) ||
+ (d_name.len == 2 && !memcmp(d_name.name, "..", 2)), c, err,
+ dirent_name_dot_or_dotdot,
+ "invalid name");
+
+ bkey_fsck_err_on(memchr(d_name.name, '/', d_name.len), c, err,
+ dirent_name_has_slash,
+ "name with /");
+
+ bkey_fsck_err_on(d.v->d_type != DT_SUBVOL &&
+ le64_to_cpu(d.v->d_inum) == d.k->p.inode, c, err,
+ dirent_to_itself,
+ "dirent points to own directory");
+fsck_err:
+ return ret;
}
void bch2_dirent_to_text(struct printbuf *out, struct bch_fs *c,
struct bkey_s_c k)
{
struct bkey_s_c_dirent d = bkey_s_c_to_dirent(k);
+ struct qstr d_name = bch2_dirent_get_name(d);
prt_printf(out, "%.*s -> %llu type %s",
- bch2_dirent_name_bytes(d),
- d.v->d_name,
+ d_name.len,
+ d_name.name,
d.v->d_type != DT_SUBVOL
? le64_to_cpu(d.v->d_inum)
: le32_to_cpu(d.v->d_child_subvol),
int bch2_dirent_create(struct btree_trans *trans, subvol_inum dir,
const struct bch_hash_info *hash_info,
u8 type, const struct qstr *name, u64 dst_inum,
- u64 *dir_offset, int flags)
+ u64 *dir_offset,
+ bch_str_hash_flags_t str_hash_flags)
{
struct bkey_i_dirent *dirent;
int ret;
return ret;
ret = bch2_hash_set(trans, bch2_dirent_hash_desc, hash_info,
- dir, &dirent->k_i, flags);
+ dir, &dirent->k_i, str_hash_flags);
*dir_offset = dirent->k.p.offset;
return ret;
const struct bch_hash_info *hash_info,
const struct qstr *name, subvol_inum *inum)
{
- struct btree_trans trans;
+ struct btree_trans *trans = bch2_trans_get(c);
struct btree_iter iter;
int ret;
-
- bch2_trans_init(&trans, c, 0, 0);
retry:
- bch2_trans_begin(&trans);
+ bch2_trans_begin(trans);
- ret = __bch2_dirent_lookup_trans(&trans, &iter, dir, hash_info,
+ ret = __bch2_dirent_lookup_trans(trans, &iter, dir, hash_info,
name, inum, 0);
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
if (!ret)
- bch2_trans_iter_exit(&trans, &iter);
- bch2_trans_exit(&trans);
+ bch2_trans_iter_exit(trans, &iter);
+ bch2_trans_put(trans);
return ret;
}
int bch2_readdir(struct bch_fs *c, subvol_inum inum, struct dir_context *ctx)
{
- struct btree_trans trans;
+ struct btree_trans *trans = bch2_trans_get(c);
struct btree_iter iter;
struct bkey_s_c k;
struct bkey_s_c_dirent dirent;
subvol_inum target;
u32 snapshot;
struct bkey_buf sk;
+ struct qstr name;
int ret;
bch2_bkey_buf_init(&sk);
- bch2_trans_init(&trans, c, 0, 0);
retry:
- bch2_trans_begin(&trans);
+ bch2_trans_begin(trans);
- ret = bch2_subvolume_get_snapshot(&trans, inum.subvol, &snapshot);
+ ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
if (ret)
goto err;
- for_each_btree_key_upto_norestart(&trans, iter, BTREE_ID_dirents,
+ for_each_btree_key_upto_norestart(trans, iter, BTREE_ID_dirents,
SPOS(inum.inum, ctx->pos, snapshot),
POS(inum.inum, U64_MAX), 0, k, ret) {
if (k.k->type != KEY_TYPE_dirent)
dirent = bkey_s_c_to_dirent(k);
- ret = bch2_dirent_read_target(&trans, inum, dirent, &target);
+ ret = bch2_dirent_read_target(trans, inum, dirent, &target);
if (ret < 0)
break;
if (ret)
/* dir_emit() can fault and block: */
bch2_bkey_buf_reassemble(&sk, c, k);
dirent = bkey_i_to_s_c_dirent(sk.k);
- bch2_trans_unlock(&trans);
+ bch2_trans_unlock(trans);
+
+ name = bch2_dirent_get_name(dirent);
ctx->pos = dirent.k->p.offset;
- if (!dir_emit(ctx, dirent.v->d_name,
- bch2_dirent_name_bytes(dirent),
+ if (!dir_emit(ctx, name.name,
+ name.len,
target.inum,
vfs_d_type(dirent.v->d_type)))
break;
* read_target looks up subvolumes, we can overflow paths if the
* directory has many subvolumes in it
*/
- ret = btree_trans_too_many_iters(&trans);
+ ret = btree_trans_too_many_iters(trans);
if (ret)
break;
}
- bch2_trans_iter_exit(&trans, &iter);
+ bch2_trans_iter_exit(trans, &iter);
err:
if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
goto retry;
- bch2_trans_exit(&trans);
+ bch2_trans_put(trans);
bch2_bkey_buf_exit(&sk, c);
return ret;
projects / bcachefs-tools-debian / blobdiff