+// SPDX-License-Identifier: GPL-2.0
#include "bcachefs.h"
#include "bkey_methods.h"
}
const struct bch_hash_desc bch2_dirent_hash_desc = {
- .btree_id = BTREE_ID_DIRENTS,
- .key_type = BCH_DIRENT,
- .whiteout_type = BCH_DIRENT_WHITEOUT,
+ .btree_id = BTREE_ID_dirents,
+ .key_type = KEY_TYPE_dirent,
.hash_key = dirent_hash_key,
.hash_bkey = dirent_hash_bkey,
.cmp_key = dirent_cmp_key,
const char *bch2_dirent_invalid(const struct bch_fs *c, struct bkey_s_c k)
{
- struct bkey_s_c_dirent d;
+ struct bkey_s_c_dirent d = bkey_s_c_to_dirent(k);
unsigned len;
- switch (k.k->type) {
- case BCH_DIRENT:
- if (bkey_val_bytes(k.k) < sizeof(struct bch_dirent))
- return "value too small";
+ if (bkey_val_bytes(k.k) < sizeof(struct bch_dirent))
+ return "value too small";
- d = bkey_s_c_to_dirent(k);
- len = bch2_dirent_name_bytes(d);
+ len = bch2_dirent_name_bytes(d);
+ if (!len)
+ return "empty name";
- if (!len)
- return "empty name";
+ if (bkey_val_u64s(k.k) > dirent_val_u64s(len))
+ return "value too big";
- /*
- * older versions of bcachefs were buggy and creating dirent
- * keys that were bigger than necessary:
- */
- if (bkey_val_u64s(k.k) > dirent_val_u64s(len + 7))
- return "value too big";
+ if (len > BCH_NAME_MAX)
+ return "dirent name too big";
- if (len > BCH_NAME_MAX)
- return "dirent name too big";
+ if (len == 1 && !memcmp(d.v->d_name, ".", 1))
+ return "invalid name";
- return NULL;
- case BCH_DIRENT_WHITEOUT:
- return bkey_val_bytes(k.k) != 0
- ? "value size should be zero"
- : NULL;
+ if (len == 2 && !memcmp(d.v->d_name, "..", 2))
+ return "invalid name";
- default:
- return "invalid type";
- }
+ if (memchr(d.v->d_name, '/', len))
+ return "invalid name";
+
+ if (le64_to_cpu(d.v->d_inum) == d.k->p.inode)
+ return "dirent points to own directory";
+
+ return NULL;
}
void bch2_dirent_to_text(struct printbuf *out, struct bch_fs *c,
struct bkey_s_c k)
{
- struct bkey_s_c_dirent d;
-
- switch (k.k->type) {
- case BCH_DIRENT:
- d = bkey_s_c_to_dirent(k);
-
- bch_scnmemcpy(out, d.v->d_name,
- bch2_dirent_name_bytes(d));
- pr_buf(out, " -> %llu", d.v->d_inum);
- break;
- case BCH_DIRENT_WHITEOUT:
- pr_buf(out, "whiteout");
- break;
- }
+ struct bkey_s_c_dirent d = bkey_s_c_to_dirent(k);
+
+ bch_scnmemcpy(out, d.v->d_name,
+ bch2_dirent_name_bytes(d));
+ pr_buf(out, " -> %llu type %s", d.v->d_inum,
+ d.v->d_type < DT_MAX
+ ? bch2_d_types[d.v->d_type]
+ : "(bad d_type)");
}
static struct bkey_i_dirent *dirent_create_key(struct btree_trans *trans,
return dirent;
}
-int __bch2_dirent_create(struct btree_trans *trans,
- u64 dir_inum, const struct bch_hash_info *hash_info,
- u8 type, const struct qstr *name, u64 dst_inum,
- int flags)
+int bch2_dirent_create(struct btree_trans *trans,
+ u64 dir_inum, const struct bch_hash_info *hash_info,
+ u8 type, const struct qstr *name, u64 dst_inum,
+ u64 *dir_offset, int flags)
{
struct bkey_i_dirent *dirent;
int ret;
if (ret)
return ret;
- return __bch2_hash_set(trans, bch2_dirent_hash_desc, hash_info,
- dir_inum, &dirent->k_i, flags);
-}
+ ret = bch2_hash_set(trans, bch2_dirent_hash_desc, hash_info,
+ dir_inum, &dirent->k_i, flags);
+ *dir_offset = dirent->k.p.offset;
-int bch2_dirent_create(struct bch_fs *c, u64 dir_inum,
- const struct bch_hash_info *hash_info,
- u8 type, const struct qstr *name, u64 dst_inum,
- u64 *journal_seq, int flags)
-{
- return bch2_trans_do(c, journal_seq, flags,
- __bch2_dirent_create(&trans, dir_inum, hash_info,
- type, name, dst_inum, flags));
+ return ret;
}
static void dirent_copy_target(struct bkey_i_dirent *dst,
dst->v.d_type = src.v->d_type;
}
-static struct bpos bch2_dirent_pos(struct bch_inode_info *inode,
- const struct qstr *name)
-{
- return POS(inode->v.i_ino, bch2_dirent_hash(&inode->ei_str_hash, name));
-}
-
int bch2_dirent_rename(struct btree_trans *trans,
- struct bch_inode_info *src_dir, const struct qstr *src_name,
- struct bch_inode_info *dst_dir, const struct qstr *dst_name,
- enum bch_rename_mode mode)
+ u64 src_dir, struct bch_hash_info *src_hash,
+ u64 dst_dir, struct bch_hash_info *dst_hash,
+ const struct qstr *src_name, u64 *src_inum, u64 *src_offset,
+ const struct qstr *dst_name, u64 *dst_inum, u64 *dst_offset,
+ enum bch_rename_mode mode)
{
- struct btree_iter *src_iter, *dst_iter;
+ struct btree_iter src_iter = { NULL };
+ struct btree_iter dst_iter = { NULL };
struct bkey_s_c old_src, old_dst;
struct bkey_i_dirent *new_src = NULL, *new_dst = NULL;
- struct bpos dst_pos = bch2_dirent_pos(dst_dir, dst_name);
- int ret;
+ struct bpos dst_pos =
+ POS(dst_dir, bch2_dirent_hash(dst_hash, dst_name));
+ int ret = 0;
+
+ *src_inum = *dst_inum = 0;
/*
* Lookup dst:
* the target already exists - we're relying on the VFS
* to do that check for us for correctness:
*/
- dst_iter = mode == BCH_RENAME
- ? bch2_hash_hole(trans, bch2_dirent_hash_desc,
- &dst_dir->ei_str_hash,
- dst_dir->v.i_ino, dst_name)
- : bch2_hash_lookup(trans, bch2_dirent_hash_desc,
- &dst_dir->ei_str_hash,
- dst_dir->v.i_ino, dst_name,
+ ret = mode == BCH_RENAME
+ ? bch2_hash_hole(trans, &dst_iter, bch2_dirent_hash_desc,
+ dst_hash, dst_dir, dst_name)
+ : bch2_hash_lookup(trans, &dst_iter, bch2_dirent_hash_desc,
+ dst_hash, dst_dir, dst_name,
BTREE_ITER_INTENT);
- if (IS_ERR(dst_iter))
- return PTR_ERR(dst_iter);
- old_dst = bch2_btree_iter_peek_slot(dst_iter);
+ if (ret)
+ goto out;
+
+ old_dst = bch2_btree_iter_peek_slot(&dst_iter);
+ ret = bkey_err(old_dst);
+ if (ret)
+ goto out;
+
+ if (mode != BCH_RENAME)
+ *dst_inum = le64_to_cpu(bkey_s_c_to_dirent(old_dst).v->d_inum);
+ if (mode != BCH_RENAME_EXCHANGE)
+ *src_offset = dst_iter.pos.offset;
/* Lookup src: */
- src_iter = bch2_hash_lookup(trans, bch2_dirent_hash_desc,
- &src_dir->ei_str_hash,
- src_dir->v.i_ino, src_name,
- BTREE_ITER_INTENT);
- if (IS_ERR(src_iter))
- return PTR_ERR(src_iter);
- old_src = bch2_btree_iter_peek_slot(src_iter);
+ ret = bch2_hash_lookup(trans, &src_iter, bch2_dirent_hash_desc,
+ src_hash, src_dir, src_name,
+ BTREE_ITER_INTENT);
+ if (ret)
+ goto out;
+
+ old_src = bch2_btree_iter_peek_slot(&src_iter);
+ ret = bkey_err(old_src);
+ if (ret)
+ goto out;
+
+ *src_inum = le64_to_cpu(bkey_s_c_to_dirent(old_src).v->d_inum);
/* Create new dst key: */
new_dst = dirent_create_key(trans, 0, dst_name, 0);
- if (IS_ERR(new_dst))
- return PTR_ERR(new_dst);
+ ret = PTR_ERR_OR_ZERO(new_dst);
+ if (ret)
+ goto out;
dirent_copy_target(new_dst, bkey_s_c_to_dirent(old_src));
- new_dst->k.p = dst_iter->pos;
+ new_dst->k.p = dst_iter.pos;
/* Create new src key: */
if (mode == BCH_RENAME_EXCHANGE) {
new_src = dirent_create_key(trans, 0, src_name, 0);
- if (IS_ERR(new_src))
- return PTR_ERR(new_src);
+ ret = PTR_ERR_OR_ZERO(new_src);
+ if (ret)
+ goto out;
dirent_copy_target(new_src, bkey_s_c_to_dirent(old_dst));
- new_src->k.p = src_iter->pos;
+ new_src->k.p = src_iter.pos;
} else {
new_src = bch2_trans_kmalloc(trans, sizeof(struct bkey_i));
- if (IS_ERR(new_src))
- return PTR_ERR(new_src);
+ ret = PTR_ERR_OR_ZERO(new_src);
+ if (ret)
+ goto out;
+
bkey_init(&new_src->k);
- new_src->k.p = src_iter->pos;
+ new_src->k.p = src_iter.pos;
- if (bkey_cmp(dst_pos, src_iter->pos) <= 0 &&
- bkey_cmp(src_iter->pos, dst_iter->pos) < 0) {
+ if (bkey_cmp(dst_pos, src_iter.pos) <= 0 &&
+ bkey_cmp(src_iter.pos, dst_iter.pos) < 0) {
/*
* We have a hash collision for the new dst key,
* and new_src - the key we're deleting - is between
* If we're not overwriting, we can just insert
* new_dst at the src position:
*/
- new_dst->k.p = src_iter->pos;
- bch2_trans_update(trans,
- BTREE_INSERT_ENTRY(src_iter,
- &new_dst->k_i));
- return 0;
+ new_dst->k.p = src_iter.pos;
+ bch2_trans_update(trans, &src_iter,
+ &new_dst->k_i, 0);
+ goto out_set_offset;
} else {
/* If we're overwriting, we can't insert new_dst
* at a different slot because it has to
* overwrite old_dst - just make sure to use a
* whiteout when deleting src:
*/
- new_src->k.type = BCH_DIRENT_WHITEOUT;
+ new_src->k.type = KEY_TYPE_hash_whiteout;
}
} else {
/* Check if we need a whiteout to delete src: */
ret = bch2_hash_needs_whiteout(trans, bch2_dirent_hash_desc,
- &src_dir->ei_str_hash,
- src_iter);
+ src_hash, &src_iter);
if (ret < 0)
- return ret;
+ goto out;
if (ret)
- new_src->k.type = BCH_DIRENT_WHITEOUT;
+ new_src->k.type = KEY_TYPE_hash_whiteout;
}
}
- bch2_trans_update(trans, BTREE_INSERT_ENTRY(src_iter, &new_src->k_i));
- bch2_trans_update(trans, BTREE_INSERT_ENTRY(dst_iter, &new_dst->k_i));
- return 0;
+ bch2_trans_update(trans, &src_iter, &new_src->k_i, 0);
+ bch2_trans_update(trans, &dst_iter, &new_dst->k_i, 0);
+out_set_offset:
+ if (mode == BCH_RENAME_EXCHANGE)
+ *src_offset = new_src->k.p.offset;
+ *dst_offset = new_dst->k.p.offset;
+out:
+ bch2_trans_iter_exit(trans, &src_iter);
+ bch2_trans_iter_exit(trans, &dst_iter);
+ return ret;
}
-int __bch2_dirent_delete(struct btree_trans *trans, u64 dir_inum,
- const struct bch_hash_info *hash_info,
- const struct qstr *name)
+int bch2_dirent_delete_at(struct btree_trans *trans,
+ const struct bch_hash_info *hash_info,
+ struct btree_iter *iter)
{
- return bch2_hash_delete(trans, bch2_dirent_hash_desc, hash_info,
- dir_inum, name);
+ return bch2_hash_delete_at(trans, bch2_dirent_hash_desc,
+ hash_info, iter);
}
-int bch2_dirent_delete(struct bch_fs *c, u64 dir_inum,
- const struct bch_hash_info *hash_info,
- const struct qstr *name,
- u64 *journal_seq)
+int __bch2_dirent_lookup_trans(struct btree_trans *trans,
+ struct btree_iter *iter,
+ u64 dir_inum,
+ const struct bch_hash_info *hash_info,
+ const struct qstr *name, unsigned flags)
{
- return bch2_trans_do(c, journal_seq,
- BTREE_INSERT_ATOMIC|
- BTREE_INSERT_NOFAIL,
- __bch2_dirent_delete(&trans, dir_inum, hash_info, name));
+ return bch2_hash_lookup(trans, iter, bch2_dirent_hash_desc,
+ hash_info, dir_inum, name, flags);
}
u64 bch2_dirent_lookup(struct bch_fs *c, u64 dir_inum,
const struct qstr *name)
{
struct btree_trans trans;
- struct btree_iter *iter;
+ struct btree_iter iter;
struct bkey_s_c k;
u64 inum = 0;
+ int ret = 0;
- bch2_trans_init(&trans, c);
+ bch2_trans_init(&trans, c, 0, 0);
- iter = bch2_hash_lookup(&trans, bch2_dirent_hash_desc,
- hash_info, dir_inum, name, 0);
- if (IS_ERR(iter)) {
- BUG_ON(PTR_ERR(iter) == -EINTR);
+ ret = __bch2_dirent_lookup_trans(&trans, &iter, dir_inum,
+ hash_info, name, 0);
+ if (ret)
+ goto out;
+
+ k = bch2_btree_iter_peek_slot(&iter);
+ ret = bkey_err(k);
+ if (ret)
goto out;
- }
- k = bch2_btree_iter_peek_slot(iter);
inum = le64_to_cpu(bkey_s_c_to_dirent(k).v->d_inum);
+ bch2_trans_iter_exit(&trans, &iter);
out:
+ BUG_ON(ret == -EINTR);
bch2_trans_exit(&trans);
return inum;
}
-int bch2_empty_dir(struct bch_fs *c, u64 dir_inum)
+int bch2_empty_dir_trans(struct btree_trans *trans, u64 dir_inum)
{
struct btree_iter iter;
struct bkey_s_c k;
- int ret = 0;
+ int ret;
- for_each_btree_key(&iter, c, BTREE_ID_DIRENTS, POS(dir_inum, 0), 0, k) {
+ for_each_btree_key(trans, iter, BTREE_ID_dirents,
+ POS(dir_inum, 0), 0, k, ret) {
if (k.k->p.inode > dir_inum)
break;
- if (k.k->type == BCH_DIRENT) {
+ if (k.k->type == KEY_TYPE_dirent) {
ret = -ENOTEMPTY;
break;
}
}
- bch2_btree_iter_unlock(&iter);
+ bch2_trans_iter_exit(trans, &iter);
return ret;
}
-int bch2_readdir(struct bch_fs *c, struct file *file,
- struct dir_context *ctx)
+int bch2_readdir(struct bch_fs *c, u64 inum, struct dir_context *ctx)
{
- struct bch_inode_info *inode = file_bch_inode(file);
+ struct btree_trans trans;
struct btree_iter iter;
struct bkey_s_c k;
struct bkey_s_c_dirent dirent;
- unsigned len;
-
- if (!dir_emit_dots(file, ctx))
- return 0;
+ int ret;
- for_each_btree_key(&iter, c, BTREE_ID_DIRENTS,
- POS(inode->v.i_ino, ctx->pos), 0, k) {
- if (k.k->type != BCH_DIRENT)
- continue;
+ bch2_trans_init(&trans, c, 0, 0);
- dirent = bkey_s_c_to_dirent(k);
+ for_each_btree_key(&trans, iter, BTREE_ID_dirents,
+ POS(inum, ctx->pos), 0, k, ret) {
+ if (k.k->p.inode > inum)
+ break;
- if (bkey_cmp(k.k->p, POS(inode->v.i_ino, ctx->pos)) < 0)
+ if (k.k->type != KEY_TYPE_dirent)
continue;
- if (k.k->p.inode > inode->v.i_ino)
- break;
-
- len = bch2_dirent_name_bytes(dirent);
+ dirent = bkey_s_c_to_dirent(k);
/*
* XXX: dir_emit() can fault and block, while we're holding
* locks
*/
- if (!dir_emit(ctx, dirent.v->d_name, len,
+ ctx->pos = dirent.k->p.offset;
+ if (!dir_emit(ctx, dirent.v->d_name,
+ bch2_dirent_name_bytes(dirent),
le64_to_cpu(dirent.v->d_inum),
dirent.v->d_type))
break;
-
- ctx->pos = k.k->p.offset + 1;
+ ctx->pos = dirent.k->p.offset + 1;
}
- bch2_btree_iter_unlock(&iter);
+ bch2_trans_iter_exit(&trans, &iter);
+
+ ret = bch2_trans_exit(&trans) ?: ret;
- return 0;
+ return ret;
}
projects / bcachefs-tools-debian / blobdiff