1 files changed, 0 insertions, 603 deletions

diff --git a/c_src/libbcachefs/dirent.c b/c_src/libbcachefs/dirent.c
deleted file mode 100644
index 4ae1e9f0..00000000
--- a/c_src/libbcachefs/dirent.c
+++ /dev/null
@@ -1,603 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-
-#include "bcachefs.h"
-#include "bkey_buf.h"
-#include "bkey_methods.h"
-#include "btree_update.h"
-#include "extents.h"
-#include "dirent.h"
-#include "fs.h"
-#include "keylist.h"
-#include "str_hash.h"
-#include "subvolume.h"
-
-#include <linux/dcache.h>
-
-static unsigned bch2_dirent_name_bytes(struct bkey_s_c_dirent d)
-{
-	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;
-}
-
-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,
-			    const struct qstr *name)
-{
-	struct bch_str_hash_ctx ctx;
-
-	bch2_str_hash_init(&ctx, info);
-	bch2_str_hash_update(&ctx, info, name->name, name->len);
-
-	/* [0,2) reserved for dots */
-	return max_t(u64, bch2_str_hash_end(&ctx, info), 2);
-}
-
-static u64 dirent_hash_key(const struct bch_hash_info *info, const void *key)
-{
-	return bch2_dirent_hash(info, key);
-}
-
-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 = 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);
-	const struct qstr l_name = bch2_dirent_get_name(l);
-	const struct qstr *r_name = _r;
-
-	return !qstr_eq(l_name, *r_name);
-}
-
-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);
-	const struct qstr l_name = bch2_dirent_get_name(l);
-	const struct qstr r_name = bch2_dirent_get_name(r);
-
-	return !qstr_eq(l_name, r_name);
-}
-
-static bool dirent_is_visible(subvol_inum inum, struct bkey_s_c k)
-{
-	struct bkey_s_c_dirent d = bkey_s_c_to_dirent(k);
-
-	if (d.v->d_type == DT_SUBVOL)
-		return le32_to_cpu(d.v->d_parent_subvol) == inum.subvol;
-	return true;
-}
-
-const struct bch_hash_desc bch2_dirent_hash_desc = {
-	.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,
-	.cmp_bkey	= dirent_cmp_bkey,
-	.is_visible	= dirent_is_visible,
-};
-
-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);
-	struct qstr d_name = bch2_dirent_get_name(d);
-	int ret = 0;
-
-	bkey_fsck_err_on(!d_name.len, c, err,
-			 dirent_empty_name,
-			 "empty name");
-
-	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));
-
-	/*
-	 * 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",
-	       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),
-	       bch2_d_type_str(d.v->d_type));
-}
-
-static struct bkey_i_dirent *dirent_create_key(struct btree_trans *trans,
-				subvol_inum dir, u8 type,
-				const struct qstr *name, u64 dst)
-{
-	struct bkey_i_dirent *dirent;
-	unsigned u64s = BKEY_U64s + dirent_val_u64s(name->len);
-
-	if (name->len > BCH_NAME_MAX)
-		return ERR_PTR(-ENAMETOOLONG);
-
-	BUG_ON(u64s > U8_MAX);
-
-	dirent = bch2_trans_kmalloc(trans, u64s * sizeof(u64));
-	if (IS_ERR(dirent))
-		return dirent;
-
-	bkey_dirent_init(&dirent->k_i);
-	dirent->k.u64s = u64s;
-
-	if (type != DT_SUBVOL) {
-		dirent->v.d_inum = cpu_to_le64(dst);
-	} else {
-		dirent->v.d_parent_subvol = cpu_to_le32(dir.subvol);
-		dirent->v.d_child_subvol = cpu_to_le32(dst);
-	}
-
-	dirent->v.d_type = type;
-
-	memcpy(dirent->v.d_name, name->name, name->len);
-	memset(dirent->v.d_name + name->len, 0,
-	       bkey_val_bytes(&dirent->k) -
-	       offsetof(struct bch_dirent, d_name) -
-	       name->len);
-
-	EBUG_ON(bch2_dirent_name_bytes(dirent_i_to_s_c(dirent)) != name->len);
-
-	return dirent;
-}
-
-int bch2_dirent_create_snapshot(struct btree_trans *trans,
-			u64 dir, u32 snapshot,
-			const struct bch_hash_info *hash_info,
-			u8 type, const struct qstr *name, u64 dst_inum,
-			u64 *dir_offset,
-			bch_str_hash_flags_t str_hash_flags)
-{
-	subvol_inum zero_inum = { 0 };
-	struct bkey_i_dirent *dirent;
-	int ret;
-
-	dirent = dirent_create_key(trans, zero_inum, type, name, dst_inum);
-	ret = PTR_ERR_OR_ZERO(dirent);
-	if (ret)
-		return ret;
-
-	dirent->k.p.inode	= dir;
-	dirent->k.p.snapshot	= snapshot;
-
-	ret = bch2_hash_set_snapshot(trans, bch2_dirent_hash_desc, hash_info,
-				     zero_inum, snapshot,
-				     &dirent->k_i, str_hash_flags,
-				     BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE);
-	*dir_offset = dirent->k.p.offset;
-
-	return ret;
-}
-
-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,
-		       bch_str_hash_flags_t str_hash_flags)
-{
-	struct bkey_i_dirent *dirent;
-	int ret;
-
-	dirent = dirent_create_key(trans, dir, type, name, dst_inum);
-	ret = PTR_ERR_OR_ZERO(dirent);
-	if (ret)
-		return ret;
-
-	ret = bch2_hash_set(trans, bch2_dirent_hash_desc, hash_info,
-			    dir, &dirent->k_i, str_hash_flags);
-	*dir_offset = dirent->k.p.offset;
-
-	return ret;
-}
-
-static void dirent_copy_target(struct bkey_i_dirent *dst,
-			       struct bkey_s_c_dirent src)
-{
-	dst->v.d_inum = src.v->d_inum;
-	dst->v.d_type = src.v->d_type;
-}
-
-int bch2_dirent_read_target(struct btree_trans *trans, subvol_inum dir,
-			    struct bkey_s_c_dirent d, subvol_inum *target)
-{
-	struct bch_subvolume s;
-	int ret = 0;
-
-	if (d.v->d_type == DT_SUBVOL &&
-	    le32_to_cpu(d.v->d_parent_subvol) != dir.subvol)
-		return 1;
-
-	if (likely(d.v->d_type != DT_SUBVOL)) {
-		target->subvol	= dir.subvol;
-		target->inum	= le64_to_cpu(d.v->d_inum);
-	} else {
-		target->subvol	= le32_to_cpu(d.v->d_child_subvol);
-
-		ret = bch2_subvolume_get(trans, target->subvol, true, BTREE_ITER_CACHED, &s);
-
-		target->inum	= le64_to_cpu(s.inode);
-	}
-
-	return ret;
-}
-
-int bch2_dirent_rename(struct btree_trans *trans,
-		subvol_inum src_dir, struct bch_hash_info *src_hash,
-		subvol_inum dst_dir, struct bch_hash_info *dst_hash,
-		const struct qstr *src_name, subvol_inum *src_inum, u64 *src_offset,
-		const struct qstr *dst_name, subvol_inum *dst_inum, u64 *dst_offset,
-		enum bch_rename_mode mode)
-{
-	struct btree_iter src_iter = { NULL };
-	struct btree_iter dst_iter = { NULL };
-	struct bkey_s_c old_src, old_dst = bkey_s_c_null;
-	struct bkey_i_dirent *new_src = NULL, *new_dst = NULL;
-	struct bpos dst_pos =
-		POS(dst_dir.inum, bch2_dirent_hash(dst_hash, dst_name));
-	unsigned src_type = 0, dst_type = 0, src_update_flags = 0;
-	int ret = 0;
-
-	if (src_dir.subvol != dst_dir.subvol)
-		return -EXDEV;
-
-	memset(src_inum, 0, sizeof(*src_inum));
-	memset(dst_inum, 0, sizeof(*dst_inum));
-
-	/* Lookup src: */
-	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;
-
-	ret = bch2_dirent_read_target(trans, src_dir,
-			bkey_s_c_to_dirent(old_src), src_inum);
-	if (ret)
-		goto out;
-
-	src_type = bkey_s_c_to_dirent(old_src).v->d_type;
-
-	if (src_type == DT_SUBVOL && mode == BCH_RENAME_EXCHANGE)
-		return -EOPNOTSUPP;
-
-
-	/* Lookup dst: */
-	if (mode == BCH_RENAME) {
-		/*
-		 * Note that we're _not_ checking if the target already exists -
-		 * we're relying on the VFS to do that check for us for
-		 * correctness:
-		 */
-		ret = bch2_hash_hole(trans, &dst_iter, bch2_dirent_hash_desc,
-				     dst_hash, dst_dir, dst_name);
-		if (ret)
-			goto out;
-	} else {
-		ret = bch2_hash_lookup(trans, &dst_iter, bch2_dirent_hash_desc,
-				       dst_hash, dst_dir, dst_name,
-				       BTREE_ITER_INTENT);
-		if (ret)
-			goto out;
-
-		old_dst = bch2_btree_iter_peek_slot(&dst_iter);
-		ret = bkey_err(old_dst);
-		if (ret)
-			goto out;
-
-		ret = bch2_dirent_read_target(trans, dst_dir,
-				bkey_s_c_to_dirent(old_dst), dst_inum);
-		if (ret)
-			goto out;
-
-		dst_type = bkey_s_c_to_dirent(old_dst).v->d_type;
-
-		if (dst_type == DT_SUBVOL)
-			return -EOPNOTSUPP;
-	}
-
-	if (mode != BCH_RENAME_EXCHANGE)
-		*src_offset = dst_iter.pos.offset;
-
-	/* Create new dst key: */
-	new_dst = dirent_create_key(trans, dst_dir, 0, dst_name, 0);
-	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;
-
-	/* Create new src key: */
-	if (mode == BCH_RENAME_EXCHANGE) {
-		new_src = dirent_create_key(trans, src_dir, 0, src_name, 0);
-		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;
-	} else {
-		new_src = bch2_trans_kmalloc(trans, sizeof(struct bkey_i));
-		ret = PTR_ERR_OR_ZERO(new_src);
-		if (ret)
-			goto out;
-
-		bkey_init(&new_src->k);
-		new_src->k.p = src_iter.pos;
-
-		if (bkey_le(dst_pos, src_iter.pos) &&
-		    bkey_lt(src_iter.pos, dst_iter.pos)) {
-			/*
-			 * We have a hash collision for the new dst key,
-			 * and new_src - the key we're deleting - is between
-			 * new_dst's hashed slot and the slot we're going to be
-			 * inserting it into - oops.  This will break the hash
-			 * table if we don't deal with it:
-			 */
-			if (mode == BCH_RENAME) {
-				/*
-				 * If we're not overwriting, we can just insert
-				 * new_dst at the src position:
-				 */
-				new_src = new_dst;
-				new_src->k.p = src_iter.pos;
-				goto out_set_src;
-			} 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 = 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_hash, &src_iter);
-			if (ret < 0)
-				goto out;
-
-			if (ret)
-				new_src->k.type = KEY_TYPE_hash_whiteout;
-		}
-	}
-
-	ret = bch2_trans_update(trans, &dst_iter, &new_dst->k_i, 0);
-	if (ret)
-		goto out;
-out_set_src:
-
-	/*
-	 * If we're deleting a subvolume, we need to really delete the dirent,
-	 * not just emit a whiteout in the current snapshot:
-	 */
-	if (src_type == DT_SUBVOL) {
-		bch2_btree_iter_set_snapshot(&src_iter, old_src.k->p.snapshot);
-		ret = bch2_btree_iter_traverse(&src_iter);
-		if (ret)
-			goto out;
-
-		new_src->k.p = src_iter.pos;
-		src_update_flags |= BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE;
-	}
-
-	ret = bch2_trans_update(trans, &src_iter, &new_src->k_i, src_update_flags);
-	if (ret)
-		goto out;
-
-	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_lookup_trans(struct btree_trans *trans,
-			       struct btree_iter *iter,
-			       subvol_inum dir,
-			       const struct bch_hash_info *hash_info,
-			       const struct qstr *name, subvol_inum *inum,
-			       unsigned flags)
-{
-	struct bkey_s_c k;
-	struct bkey_s_c_dirent d;
-	u32 snapshot;
-	int ret;
-
-	ret = bch2_subvolume_get_snapshot(trans, dir.subvol, &snapshot);
-	if (ret)
-		return ret;
-
-	ret = bch2_hash_lookup(trans, iter, bch2_dirent_hash_desc,
-			       hash_info, dir, name, flags);
-	if (ret)
-		return ret;
-
-	k = bch2_btree_iter_peek_slot(iter);
-	ret = bkey_err(k);
-	if (ret)
-		goto err;
-
-	d = bkey_s_c_to_dirent(k);
-
-	ret = bch2_dirent_read_target(trans, dir, d, inum);
-	if (ret > 0)
-		ret = -ENOENT;
-err:
-	if (ret)
-		bch2_trans_iter_exit(trans, iter);
-
-	return ret;
-}
-
-u64 bch2_dirent_lookup(struct bch_fs *c, subvol_inum dir,
-		       const struct bch_hash_info *hash_info,
-		       const struct qstr *name, subvol_inum *inum)
-{
-	struct btree_trans *trans = bch2_trans_get(c);
-	struct btree_iter iter = { NULL };
-
-	int ret = lockrestart_do(trans,
-		__bch2_dirent_lookup_trans(trans, &iter, dir, hash_info, name, inum, 0));
-	bch2_trans_iter_exit(trans, &iter);
-	bch2_trans_put(trans);
-	return ret;
-}
-
-int bch2_empty_dir_snapshot(struct btree_trans *trans, u64 dir, u32 snapshot)
-{
-	struct btree_iter iter;
-	struct bkey_s_c k;
-	int ret;
-
-	for_each_btree_key_upto_norestart(trans, iter, BTREE_ID_dirents,
-			   SPOS(dir, 0, snapshot),
-			   POS(dir, U64_MAX), 0, k, ret)
-		if (k.k->type == KEY_TYPE_dirent) {
-			ret = -ENOTEMPTY;
-			break;
-		}
-	bch2_trans_iter_exit(trans, &iter);
-
-	return ret;
-}
-
-int bch2_empty_dir_trans(struct btree_trans *trans, subvol_inum dir)
-{
-	u32 snapshot;
-
-	return bch2_subvolume_get_snapshot(trans, dir.subvol, &snapshot) ?:
-		bch2_empty_dir_snapshot(trans, dir.inum, snapshot);
-}
-
-int bch2_readdir(struct bch_fs *c, subvol_inum inum, struct dir_context *ctx)
-{
-	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);
-retry:
-	bch2_trans_begin(trans);
-
-	ret = bch2_subvolume_get_snapshot(trans, inum.subvol, &snapshot);
-	if (ret)
-		goto err;
-
-	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)
-			continue;
-
-		dirent = bkey_s_c_to_dirent(k);
-
-		ret = bch2_dirent_read_target(trans, inum, dirent, &target);
-		if (ret < 0)
-			break;
-		if (ret)
-			continue;
-
-		/* 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);
-
-		name = bch2_dirent_get_name(dirent);
-
-		ctx->pos = dirent.k->p.offset;
-		if (!dir_emit(ctx, name.name,
-			      name.len,
-			      target.inum,
-			      vfs_d_type(dirent.v->d_type)))
-			break;
-		ctx->pos = dirent.k->p.offset + 1;
-
-		/*
-		 * read_target looks up subvolumes, we can overflow paths if the
-		 * directory has many subvolumes in it
-		 */
-		ret = btree_trans_too_many_iters(trans);
-		if (ret)
-			break;
-	}
-	bch2_trans_iter_exit(trans, &iter);
-err:
-	if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
-		goto retry;
-
-	bch2_trans_put(trans);
-	bch2_bkey_buf_exit(&sk, c);
-
-	return ret;
-}