[linux-block.git] / fs / bcachefs / fs-common.c

// SPDX-License-Identifier: GPL-2.0

#include "bcachefs.h"
#include "acl.h"
#include "btree_update.h"
#include "dirent.h"
#include "fs-common.h"
#include "inode.h"
#include "xattr.h"

#include <linux/posix_acl.h>

int bch2_create_trans(struct btree_trans *trans, u64 dir_inum,
		      struct bch_inode_unpacked *dir_u,
		      struct bch_inode_unpacked *new_inode,
		      const struct qstr *name,
		      uid_t uid, gid_t gid, umode_t mode, dev_t rdev,
		      struct posix_acl *default_acl,
		      struct posix_acl *acl)
{
	struct bch_fs *c = trans->c;
	struct btree_iter *dir_iter;
	struct bch_hash_info hash = bch2_hash_info_init(c, new_inode);
	u64 now = bch2_current_time(trans->c);
	int ret;

	dir_iter = bch2_inode_peek(trans, dir_u, dir_inum, BTREE_ITER_INTENT);
	if (IS_ERR(dir_iter))
		return PTR_ERR(dir_iter);

	bch2_inode_init_late(new_inode, now, uid, gid, mode, rdev, dir_u);

	if (!name)
		new_inode->bi_flags |= BCH_INODE_UNLINKED;

	ret = bch2_inode_create(trans, new_inode,
				BLOCKDEV_INODE_MAX, 0,
				&c->unused_inode_hint);
	if (ret)
		return ret;

	if (default_acl) {
		ret = bch2_set_acl_trans(trans, new_inode, &hash,
					 default_acl, ACL_TYPE_DEFAULT);
		if (ret)
			return ret;
	}

	if (acl) {
		ret = bch2_set_acl_trans(trans, new_inode, &hash,
					 acl, ACL_TYPE_ACCESS);
		if (ret)
			return ret;
	}

	if (name) {
		struct bch_hash_info dir_hash = bch2_hash_info_init(c, dir_u);
		dir_u->bi_mtime = dir_u->bi_ctime = now;

		if (S_ISDIR(new_inode->bi_mode))
			dir_u->bi_nlink++;

		ret = bch2_inode_write(trans, dir_iter, dir_u);
		if (ret)
			return ret;

		ret = bch2_dirent_create(trans, dir_inum, &dir_hash,
					 mode_to_type(new_inode->bi_mode),
					 name, new_inode->bi_inum,
					 BCH_HASH_SET_MUST_CREATE);
		if (ret)
			return ret;
	}

	return 0;
}

int bch2_link_trans(struct btree_trans *trans, u64 dir_inum,
		    u64 inum, struct bch_inode_unpacked *inode_u,
		    const struct qstr *name)
{
	struct btree_iter *dir_iter, *inode_iter;
	struct bch_inode_unpacked dir_u;
	struct bch_hash_info dir_hash;
	u64 now = bch2_current_time(trans->c);

	inode_iter = bch2_inode_peek(trans, inode_u, inum, BTREE_ITER_INTENT);
	if (IS_ERR(inode_iter))
		return PTR_ERR(inode_iter);

	inode_u->bi_ctime = now;
	bch2_inode_nlink_inc(inode_u);

	dir_iter = bch2_inode_peek(trans, &dir_u, dir_inum, 0);
	if (IS_ERR(dir_iter))
		return PTR_ERR(dir_iter);

	/* XXX: shouldn't we be updating mtime/ctime on the directory? */

	dir_hash = bch2_hash_info_init(trans->c, &dir_u);
	bch2_trans_iter_put(trans, dir_iter);

	return bch2_dirent_create(trans, dir_inum, &dir_hash,
				  mode_to_type(inode_u->bi_mode),
				  name, inum, BCH_HASH_SET_MUST_CREATE) ?:
		bch2_inode_write(trans, inode_iter, inode_u);
}

int bch2_unlink_trans(struct btree_trans *trans,
		      u64 dir_inum, struct bch_inode_unpacked *dir_u,
		      struct bch_inode_unpacked *inode_u,
		      const struct qstr *name)
{
	struct btree_iter *dir_iter, *dirent_iter, *inode_iter;
	struct bch_hash_info dir_hash;
	u64 inum, now = bch2_current_time(trans->c);
	struct bkey_s_c k;

	dir_iter = bch2_inode_peek(trans, dir_u, dir_inum, BTREE_ITER_INTENT);
	if (IS_ERR(dir_iter))
		return PTR_ERR(dir_iter);

	dir_hash = bch2_hash_info_init(trans->c, dir_u);

	dirent_iter = __bch2_dirent_lookup_trans(trans, dir_inum, &dir_hash,
						 name, BTREE_ITER_INTENT);
	if (IS_ERR(dirent_iter))
		return PTR_ERR(dirent_iter);

	k = bch2_btree_iter_peek_slot(dirent_iter);
	inum = le64_to_cpu(bkey_s_c_to_dirent(k).v->d_inum);

	inode_iter = bch2_inode_peek(trans, inode_u, inum, BTREE_ITER_INTENT);
	if (IS_ERR(inode_iter))
		return PTR_ERR(inode_iter);

	dir_u->bi_mtime = dir_u->bi_ctime = inode_u->bi_ctime = now;
	dir_u->bi_nlink -= S_ISDIR(inode_u->bi_mode);
	bch2_inode_nlink_dec(inode_u);

	return  (S_ISDIR(inode_u->bi_mode)
		 ? bch2_empty_dir_trans(trans, inum)
		 : 0) ?:
		bch2_dirent_delete_at(trans, &dir_hash, dirent_iter) ?:
		bch2_inode_write(trans, dir_iter, dir_u) ?:
		bch2_inode_write(trans, inode_iter, inode_u);
}

bool bch2_reinherit_attrs(struct bch_inode_unpacked *dst_u,
			  struct bch_inode_unpacked *src_u)
{
	u64 src, dst;
	unsigned id;
	bool ret = false;

	for (id = 0; id < Inode_opt_nr; id++) {
		if (dst_u->bi_fields_set & (1 << id))
			continue;

		src = bch2_inode_opt_get(src_u, id);
		dst = bch2_inode_opt_get(dst_u, id);

		if (src == dst)
			continue;

		bch2_inode_opt_set(dst_u, id, src);
		ret = true;
	}

	return ret;
}

int bch2_rename_trans(struct btree_trans *trans,
		      u64 src_dir, struct bch_inode_unpacked *src_dir_u,
		      u64 dst_dir, struct bch_inode_unpacked *dst_dir_u,
		      struct bch_inode_unpacked *src_inode_u,
		      struct bch_inode_unpacked *dst_inode_u,
		      const struct qstr *src_name,
		      const struct qstr *dst_name,
		      enum bch_rename_mode mode)
{
	struct btree_iter *src_dir_iter, *dst_dir_iter = NULL;
	struct btree_iter *src_inode_iter, *dst_inode_iter = NULL;
	struct bch_hash_info src_hash, dst_hash;
	u64 src_inode, dst_inode, now = bch2_current_time(trans->c);
	int ret;

	src_dir_iter = bch2_inode_peek(trans, src_dir_u, src_dir,
				       BTREE_ITER_INTENT);
	if (IS_ERR(src_dir_iter))
		return PTR_ERR(src_dir_iter);

	src_hash = bch2_hash_info_init(trans->c, src_dir_u);

	if (dst_dir != src_dir) {
		dst_dir_iter = bch2_inode_peek(trans, dst_dir_u, dst_dir,
					       BTREE_ITER_INTENT);
		if (IS_ERR(dst_dir_iter))
			return PTR_ERR(dst_dir_iter);

		dst_hash = bch2_hash_info_init(trans->c, dst_dir_u);
	} else {
		dst_dir_u = src_dir_u;
		dst_hash = src_hash;
	}

	ret = bch2_dirent_rename(trans,
				 src_dir, &src_hash,
				 dst_dir, &dst_hash,
				 src_name, &src_inode,
				 dst_name, &dst_inode,
				 mode);
	if (ret)
		return ret;

	src_inode_iter = bch2_inode_peek(trans, src_inode_u, src_inode,
					 BTREE_ITER_INTENT);
	if (IS_ERR(src_inode_iter))
		return PTR_ERR(src_inode_iter);

	if (dst_inode) {
		dst_inode_iter = bch2_inode_peek(trans, dst_inode_u, dst_inode,
						 BTREE_ITER_INTENT);
		if (IS_ERR(dst_inode_iter))
			return PTR_ERR(dst_inode_iter);
	}

	if (mode == BCH_RENAME_OVERWRITE) {
		if (S_ISDIR(src_inode_u->bi_mode) !=
		    S_ISDIR(dst_inode_u->bi_mode))
			return -ENOTDIR;

		if (S_ISDIR(dst_inode_u->bi_mode) &&
		    bch2_empty_dir_trans(trans, dst_inode))
			return -ENOTEMPTY;
	}

	if (bch2_reinherit_attrs(src_inode_u, dst_dir_u) &&
	    S_ISDIR(src_inode_u->bi_mode))
		return -EXDEV;

	if (mode == BCH_RENAME_EXCHANGE &&
	    bch2_reinherit_attrs(dst_inode_u, src_dir_u) &&
	    S_ISDIR(dst_inode_u->bi_mode))
		return -EXDEV;

	if (S_ISDIR(src_inode_u->bi_mode)) {
		src_dir_u->bi_nlink--;
		dst_dir_u->bi_nlink++;
	}

	if (dst_inode && S_ISDIR(dst_inode_u->bi_mode)) {
		dst_dir_u->bi_nlink--;
		src_dir_u->bi_nlink += mode == BCH_RENAME_EXCHANGE;
	}

	if (mode == BCH_RENAME_OVERWRITE)
		bch2_inode_nlink_dec(dst_inode_u);

	src_dir_u->bi_mtime		= now;
	src_dir_u->bi_ctime		= now;

	if (src_dir != dst_dir) {
		dst_dir_u->bi_mtime	= now;
		dst_dir_u->bi_ctime	= now;
	}

	src_inode_u->bi_ctime		= now;

	if (dst_inode)
		dst_inode_u->bi_ctime	= now;

	return  bch2_inode_write(trans, src_dir_iter, src_dir_u) ?:
		(src_dir != dst_dir
		 ? bch2_inode_write(trans, dst_dir_iter, dst_dir_u)
		 : 0 ) ?:
		bch2_inode_write(trans, src_inode_iter, src_inode_u) ?:
		(dst_inode
		 ? bch2_inode_write(trans, dst_inode_iter, dst_inode_u)
		 : 0 );
}
Commit	Line	Data
96385742 KO	1	// SPDX-License-Identifier: GPL-2.0
	2
	3	#include "bcachefs.h"
	4	#include "acl.h"
	5	#include "btree_update.h"
	6	#include "dirent.h"
	7	#include "fs-common.h"
	8	#include "inode.h"
	9	#include "xattr.h"
	10
	11	#include <linux/posix_acl.h>
	12
	13	int bch2_create_trans(struct btree_trans *trans, u64 dir_inum,
	14	struct bch_inode_unpacked *dir_u,
	15	struct bch_inode_unpacked *new_inode,
	16	const struct qstr *name,
	17	uid_t uid, gid_t gid, umode_t mode, dev_t rdev,
	18	struct posix_acl *default_acl,
	19	struct posix_acl *acl)
	20	{
	21	struct bch_fs *c = trans->c;
	22	struct btree_iter *dir_iter;
	23	struct bch_hash_info hash = bch2_hash_info_init(c, new_inode);
	24	u64 now = bch2_current_time(trans->c);
	25	int ret;
	26
63fbf458	27	dir_iter = bch2_inode_peek(trans, dir_u, dir_inum, BTREE_ITER_INTENT);
96385742 KO	28	if (IS_ERR(dir_iter))
	29	return PTR_ERR(dir_iter);
	30
	31	bch2_inode_init_late(new_inode, now, uid, gid, mode, rdev, dir_u);
	32
	33	if (!name)
	34	new_inode->bi_flags \|= BCH_INODE_UNLINKED;
	35
	36	ret = bch2_inode_create(trans, new_inode,
	37	BLOCKDEV_INODE_MAX, 0,
	38	&c->unused_inode_hint);
	39	if (ret)
	40	return ret;
	41
	42	if (default_acl) {
	43	ret = bch2_set_acl_trans(trans, new_inode, &hash,
	44	default_acl, ACL_TYPE_DEFAULT);
	45	if (ret)
	46	return ret;
	47	}
	48
	49	if (acl) {
	50	ret = bch2_set_acl_trans(trans, new_inode, &hash,
	51	acl, ACL_TYPE_ACCESS);
	52	if (ret)
	53	return ret;
	54	}
	55
	56	if (name) {
	57	struct bch_hash_info dir_hash = bch2_hash_info_init(c, dir_u);
	58	dir_u->bi_mtime = dir_u->bi_ctime = now;
	59
	60	if (S_ISDIR(new_inode->bi_mode))
	61	dir_u->bi_nlink++;
	62
	63	ret = bch2_inode_write(trans, dir_iter, dir_u);
	64	if (ret)
	65	return ret;
	66
	67	ret = bch2_dirent_create(trans, dir_inum, &dir_hash,
	68	mode_to_type(new_inode->bi_mode),
	69	name, new_inode->bi_inum,
	70	BCH_HASH_SET_MUST_CREATE);
	71	if (ret)
	72	return ret;
	73	}
	74
	75	return 0;
	76	}
	77
63fbf458	78	int bch2_link_trans(struct btree_trans *trans, u64 dir_inum,
96385742 KO	79	u64 inum, struct bch_inode_unpacked *inode_u,
	80	const struct qstr *name)
	81	{
	82	struct btree_iter dir_iter, inode_iter;
	83	struct bch_inode_unpacked dir_u;
	84	struct bch_hash_info dir_hash;
	85	u64 now = bch2_current_time(trans->c);
	86
96385742 KO	87	inode_iter = bch2_inode_peek(trans, inode_u, inum, BTREE_ITER_INTENT);
	88	if (IS_ERR(inode_iter))
	89	return PTR_ERR(inode_iter);
	90
96385742 KO	91	inode_u->bi_ctime = now;
	92	bch2_inode_nlink_inc(inode_u);
	93
63fbf458 KO	94	dir_iter = bch2_inode_peek(trans, &dir_u, dir_inum, 0);
	95	if (IS_ERR(dir_iter))
	96	return PTR_ERR(dir_iter);
	97
	98	/* XXX: shouldn't we be updating mtime/ctime on the directory? */
	99
	100	dir_hash = bch2_hash_info_init(trans->c, &dir_u);
	101	bch2_trans_iter_put(trans, dir_iter);
	102
96385742 KO	103	return bch2_dirent_create(trans, dir_inum, &dir_hash,
	104	mode_to_type(inode_u->bi_mode),
	105	name, inum, BCH_HASH_SET_MUST_CREATE) ?:
	106	bch2_inode_write(trans, inode_iter, inode_u);
	107	}
	108
	109	int bch2_unlink_trans(struct btree_trans *trans,
	110	u64 dir_inum, struct bch_inode_unpacked *dir_u,
	111	struct bch_inode_unpacked *inode_u,
	112	const struct qstr *name)
	113	{
	114	struct btree_iter dir_iter, dirent_iter, *inode_iter;
	115	struct bch_hash_info dir_hash;
	116	u64 inum, now = bch2_current_time(trans->c);
	117	struct bkey_s_c k;
	118
	119	dir_iter = bch2_inode_peek(trans, dir_u, dir_inum, BTREE_ITER_INTENT);
	120	if (IS_ERR(dir_iter))
	121	return PTR_ERR(dir_iter);
	122
	123	dir_hash = bch2_hash_info_init(trans->c, dir_u);
	124
63fbf458 KO	125	dirent_iter = __bch2_dirent_lookup_trans(trans, dir_inum, &dir_hash,
63fbf458 KO	126	name, BTREE_ITER_INTENT);
96385742 KO	127	if (IS_ERR(dirent_iter))
	128	return PTR_ERR(dirent_iter);
	129
	130	k = bch2_btree_iter_peek_slot(dirent_iter);
	131	inum = le64_to_cpu(bkey_s_c_to_dirent(k).v->d_inum);
	132
	133	inode_iter = bch2_inode_peek(trans, inode_u, inum, BTREE_ITER_INTENT);
	134	if (IS_ERR(inode_iter))
	135	return PTR_ERR(inode_iter);
	136
	137	dir_u->bi_mtime = dir_u->bi_ctime = inode_u->bi_ctime = now;
	138	dir_u->bi_nlink -= S_ISDIR(inode_u->bi_mode);
	139	bch2_inode_nlink_dec(inode_u);
	140
	141	return (S_ISDIR(inode_u->bi_mode)
	142	? bch2_empty_dir_trans(trans, inum)
	143	: 0) ?:
	144	bch2_dirent_delete_at(trans, &dir_hash, dirent_iter) ?:
	145	bch2_inode_write(trans, dir_iter, dir_u) ?:
	146	bch2_inode_write(trans, inode_iter, inode_u);
	147	}
	148
	149	bool bch2_reinherit_attrs(struct bch_inode_unpacked *dst_u,
	150	struct bch_inode_unpacked *src_u)
	151	{
	152	u64 src, dst;
	153	unsigned id;
	154	bool ret = false;
	155
	156	for (id = 0; id < Inode_opt_nr; id++) {
	157	if (dst_u->bi_fields_set & (1 << id))
	158	continue;
	159
	160	src = bch2_inode_opt_get(src_u, id);
	161	dst = bch2_inode_opt_get(dst_u, id);
	162
	163	if (src == dst)
	164	continue;
	165
	166	bch2_inode_opt_set(dst_u, id, src);
	167	ret = true;
	168	}
	169
	170	return ret;
	171	}
	172
	173	int bch2_rename_trans(struct btree_trans *trans,
	174	u64 src_dir, struct bch_inode_unpacked *src_dir_u,
	175	u64 dst_dir, struct bch_inode_unpacked *dst_dir_u,
	176	struct bch_inode_unpacked *src_inode_u,
	177	struct bch_inode_unpacked *dst_inode_u,
	178	const struct qstr *src_name,
	179	const struct qstr *dst_name,
	180	enum bch_rename_mode mode)
	181	{
	182	struct btree_iter src_dir_iter, dst_dir_iter = NULL;
	183	struct btree_iter src_inode_iter, dst_inode_iter = NULL;
	184	struct bch_hash_info src_hash, dst_hash;
	185	u64 src_inode, dst_inode, now = bch2_current_time(trans->c);
	186	int ret;
	187
	188	src_dir_iter = bch2_inode_peek(trans, src_dir_u, src_dir,
	189	BTREE_ITER_INTENT);
	190	if (IS_ERR(src_dir_iter))
191	return PTR_ERR(src_dir_iter);
192
193	src_hash = bch2_hash_info_init(trans->c, src_dir_u);
194
195	if (dst_dir != src_dir) {
196	dst_dir_iter = bch2_inode_peek(trans, dst_dir_u, dst_dir,
197	BTREE_ITER_INTENT);
198	if (IS_ERR(dst_dir_iter))
199	return PTR_ERR(dst_dir_iter);
200
201	dst_hash = bch2_hash_info_init(trans->c, dst_dir_u);
202	} else {
203	dst_dir_u = src_dir_u;
204	dst_hash = src_hash;
205	}
206
207	ret = bch2_dirent_rename(trans,
208	src_dir, &src_hash,
209	dst_dir, &dst_hash,
210	src_name, &src_inode,
211	dst_name, &dst_inode,
212	mode);
213	if (ret)
214	return ret;
215
216	src_inode_iter = bch2_inode_peek(trans, src_inode_u, src_inode,
217	BTREE_ITER_INTENT);
218	if (IS_ERR(src_inode_iter))
219	return PTR_ERR(src_inode_iter);
220
221	if (dst_inode) {
222	dst_inode_iter = bch2_inode_peek(trans, dst_inode_u, dst_inode,
223	BTREE_ITER_INTENT);
224	if (IS_ERR(dst_inode_iter))
225	return PTR_ERR(dst_inode_iter);
226	}
227
228	if (mode == BCH_RENAME_OVERWRITE) {
229	if (S_ISDIR(src_inode_u->bi_mode) !=
230	S_ISDIR(dst_inode_u->bi_mode))
231	return -ENOTDIR;
232
233	if (S_ISDIR(dst_inode_u->bi_mode) &&
234	bch2_empty_dir_trans(trans, dst_inode))
235	return -ENOTEMPTY;
236	}
237
238	if (bch2_reinherit_attrs(src_inode_u, dst_dir_u) &&
239	S_ISDIR(src_inode_u->bi_mode))
240	return -EXDEV;
241
242	if (mode == BCH_RENAME_EXCHANGE &&
243	bch2_reinherit_attrs(dst_inode_u, src_dir_u) &&
244	S_ISDIR(dst_inode_u->bi_mode))
245	return -EXDEV;
246
247	if (S_ISDIR(src_inode_u->bi_mode)) {
248	src_dir_u->bi_nlink--;
249	dst_dir_u->bi_nlink++;
250	}
251
252	if (dst_inode && S_ISDIR(dst_inode_u->bi_mode)) {
253	dst_dir_u->bi_nlink--;
254	src_dir_u->bi_nlink += mode == BCH_RENAME_EXCHANGE;
255	}
256
257	if (mode == BCH_RENAME_OVERWRITE)
258	bch2_inode_nlink_dec(dst_inode_u);
259
260	src_dir_u->bi_mtime = now;
261	src_dir_u->bi_ctime = now;
262
263	if (src_dir != dst_dir) {
264	dst_dir_u->bi_mtime = now;
265	dst_dir_u->bi_ctime = now;
266	}
267
268	src_inode_u->bi_ctime = now;
269
270	if (dst_inode)
271	dst_inode_u->bi_ctime = now;
272
273	return bch2_inode_write(trans, src_dir_iter, src_dir_u) ?:
274	(src_dir != dst_dir
275	? bch2_inode_write(trans, dst_dir_iter, dst_dir_u)
276	: 0 ) ?:
277	bch2_inode_write(trans, src_inode_iter, src_inode_u) ?:
278	(dst_inode
279	? bch2_inode_write(trans, dst_inode_iter, dst_inode_u)
280	: 0 );
281	}