1 // SPDX-License-Identifier: GPL-2.0
5 #include "btree_update.h"
12 #include <linux/posix_acl.h>
14 static inline int is_subdir_for_nlink(struct bch_inode_unpacked *inode)
16 return S_ISDIR(inode->bi_mode) && !inode->bi_subvol;
19 int bch2_create_trans(struct btree_trans *trans,
21 struct bch_inode_unpacked *dir_u,
22 struct bch_inode_unpacked *new_inode,
23 const struct qstr *name,
24 uid_t uid, gid_t gid, umode_t mode, dev_t rdev,
25 struct posix_acl *default_acl,
26 struct posix_acl *acl,
27 subvol_inum snapshot_src,
30 struct bch_fs *c = trans->c;
31 struct btree_iter dir_iter = { NULL };
32 struct btree_iter inode_iter = { NULL };
33 subvol_inum new_inum = dir;
34 u64 now = bch2_current_time(c);
35 u64 cpu = raw_smp_processor_id();
38 unsigned dir_type = mode_to_type(mode);
41 ret = bch2_subvolume_get_snapshot(trans, dir.subvol, &snapshot);
45 ret = bch2_inode_peek(trans, &dir_iter, dir_u, dir, BTREE_ITER_INTENT);
49 if (!(flags & BCH_CREATE_SNAPSHOT)) {
50 /* Normal create path - allocate a new inode: */
51 bch2_inode_init_late(new_inode, now, uid, gid, mode, rdev, dir_u);
53 if (flags & BCH_CREATE_TMPFILE)
54 new_inode->bi_flags |= BCH_INODE_UNLINKED;
56 ret = bch2_inode_create(trans, &inode_iter, new_inode, snapshot, cpu);
60 snapshot_src = (subvol_inum) { 0 };
63 * Creating a snapshot - we're not allocating a new inode, but
64 * we do have to lookup the root inode of the subvolume we're
65 * snapshotting and update it (in the new snapshot):
68 if (!snapshot_src.inum) {
69 /* Inode wasn't specified, just snapshot: */
70 struct bch_subvolume s;
72 ret = bch2_subvolume_get(trans, snapshot_src.subvol, true,
73 BTREE_ITER_CACHED, &s);
77 snapshot_src.inum = le64_to_cpu(s.inode);
80 ret = bch2_inode_peek(trans, &inode_iter, new_inode, snapshot_src,
85 if (new_inode->bi_subvol != snapshot_src.subvol) {
86 /* Not a subvolume root: */
92 * If we're not root, we have to own the subvolume being
95 if (uid && new_inode->bi_uid != uid) {
100 flags |= BCH_CREATE_SUBVOL;
103 new_inum.inum = new_inode->bi_inum;
104 dir_target = new_inode->bi_inum;
106 if (flags & BCH_CREATE_SUBVOL) {
107 u32 new_subvol, dir_snapshot;
109 ret = bch2_subvolume_create(trans, new_inode->bi_inum,
111 &new_subvol, &snapshot,
112 (flags & BCH_CREATE_SNAPSHOT_RO) != 0);
116 new_inode->bi_parent_subvol = dir.subvol;
117 new_inode->bi_subvol = new_subvol;
118 new_inum.subvol = new_subvol;
119 dir_target = new_subvol;
120 dir_type = DT_SUBVOL;
122 ret = bch2_subvolume_get_snapshot(trans, dir.subvol, &dir_snapshot);
126 bch2_btree_iter_set_snapshot(&dir_iter, dir_snapshot);
127 ret = bch2_btree_iter_traverse(&dir_iter);
132 if (!(flags & BCH_CREATE_SNAPSHOT)) {
134 ret = bch2_set_acl_trans(trans, new_inum, new_inode,
135 default_acl, ACL_TYPE_DEFAULT);
141 ret = bch2_set_acl_trans(trans, new_inum, new_inode,
142 acl, ACL_TYPE_ACCESS);
148 if (!(flags & BCH_CREATE_TMPFILE)) {
149 struct bch_hash_info dir_hash = bch2_hash_info_init(c, dir_u);
152 if (is_subdir_for_nlink(new_inode))
154 dir_u->bi_mtime = dir_u->bi_ctime = now;
156 ret = bch2_inode_write(trans, &dir_iter, dir_u);
160 ret = bch2_dirent_create(trans, dir, &dir_hash,
165 BCH_HASH_SET_MUST_CREATE);
169 if (c->sb.version >= bcachefs_metadata_version_inode_backpointers) {
170 new_inode->bi_dir = dir_u->bi_inum;
171 new_inode->bi_dir_offset = dir_offset;
175 inode_iter.flags &= ~BTREE_ITER_ALL_SNAPSHOTS;
176 bch2_btree_iter_set_snapshot(&inode_iter, snapshot);
178 ret = bch2_btree_iter_traverse(&inode_iter) ?:
179 bch2_inode_write(trans, &inode_iter, new_inode);
181 bch2_trans_iter_exit(trans, &inode_iter);
182 bch2_trans_iter_exit(trans, &dir_iter);
186 int bch2_link_trans(struct btree_trans *trans,
187 subvol_inum dir, struct bch_inode_unpacked *dir_u,
188 subvol_inum inum, struct bch_inode_unpacked *inode_u,
189 const struct qstr *name)
191 struct bch_fs *c = trans->c;
192 struct btree_iter dir_iter = { NULL };
193 struct btree_iter inode_iter = { NULL };
194 struct bch_hash_info dir_hash;
195 u64 now = bch2_current_time(c);
199 if (dir.subvol != inum.subvol)
202 ret = bch2_inode_peek(trans, &inode_iter, inode_u, inum, BTREE_ITER_INTENT);
206 inode_u->bi_ctime = now;
207 ret = bch2_inode_nlink_inc(inode_u);
211 ret = bch2_inode_peek(trans, &dir_iter, dir_u, dir, BTREE_ITER_INTENT);
215 if (bch2_reinherit_attrs(inode_u, dir_u)) {
220 dir_u->bi_mtime = dir_u->bi_ctime = now;
222 dir_hash = bch2_hash_info_init(c, dir_u);
224 ret = bch2_dirent_create(trans, dir, &dir_hash,
225 mode_to_type(inode_u->bi_mode),
226 name, inum.inum, &dir_offset,
227 BCH_HASH_SET_MUST_CREATE);
231 if (c->sb.version >= bcachefs_metadata_version_inode_backpointers) {
232 inode_u->bi_dir = dir.inum;
233 inode_u->bi_dir_offset = dir_offset;
236 ret = bch2_inode_write(trans, &dir_iter, dir_u) ?:
237 bch2_inode_write(trans, &inode_iter, inode_u);
239 bch2_trans_iter_exit(trans, &dir_iter);
240 bch2_trans_iter_exit(trans, &inode_iter);
244 int bch2_unlink_trans(struct btree_trans *trans,
246 struct bch_inode_unpacked *dir_u,
247 struct bch_inode_unpacked *inode_u,
248 const struct qstr *name,
249 bool deleting_snapshot)
251 struct bch_fs *c = trans->c;
252 struct btree_iter dir_iter = { NULL };
253 struct btree_iter dirent_iter = { NULL };
254 struct btree_iter inode_iter = { NULL };
255 struct bch_hash_info dir_hash;
257 u64 now = bch2_current_time(c);
261 ret = bch2_inode_peek(trans, &dir_iter, dir_u, dir, BTREE_ITER_INTENT);
265 dir_hash = bch2_hash_info_init(c, dir_u);
267 ret = __bch2_dirent_lookup_trans(trans, &dirent_iter, dir, &dir_hash,
268 name, &inum, BTREE_ITER_INTENT);
272 ret = bch2_inode_peek(trans, &inode_iter, inode_u, inum,
277 if (!deleting_snapshot && S_ISDIR(inode_u->bi_mode)) {
278 ret = bch2_empty_dir_trans(trans, inum);
283 if (deleting_snapshot && !inode_u->bi_subvol) {
288 if (deleting_snapshot || inode_u->bi_subvol) {
289 ret = bch2_subvolume_unlink(trans, inode_u->bi_subvol);
293 k = bch2_btree_iter_peek_slot(&dirent_iter);
299 * If we're deleting a subvolume, we need to really delete the
300 * dirent, not just emit a whiteout in the current snapshot:
302 bch2_btree_iter_set_snapshot(&dirent_iter, k.k->p.snapshot);
303 ret = bch2_btree_iter_traverse(&dirent_iter);
307 bch2_inode_nlink_dec(trans, inode_u);
310 if (inode_u->bi_dir == dirent_iter.pos.inode &&
311 inode_u->bi_dir_offset == dirent_iter.pos.offset) {
313 inode_u->bi_dir_offset = 0;
316 dir_u->bi_mtime = dir_u->bi_ctime = inode_u->bi_ctime = now;
317 dir_u->bi_nlink -= is_subdir_for_nlink(inode_u);
319 ret = bch2_hash_delete_at(trans, bch2_dirent_hash_desc,
320 &dir_hash, &dirent_iter,
321 BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE) ?:
322 bch2_inode_write(trans, &dir_iter, dir_u) ?:
323 bch2_inode_write(trans, &inode_iter, inode_u);
325 bch2_trans_iter_exit(trans, &inode_iter);
326 bch2_trans_iter_exit(trans, &dirent_iter);
327 bch2_trans_iter_exit(trans, &dir_iter);
331 bool bch2_reinherit_attrs(struct bch_inode_unpacked *dst_u,
332 struct bch_inode_unpacked *src_u)
338 for (id = 0; id < Inode_opt_nr; id++) {
339 /* Skip attributes that were explicitly set on this inode */
340 if (dst_u->bi_fields_set & (1 << id))
343 src = bch2_inode_opt_get(src_u, id);
344 dst = bch2_inode_opt_get(dst_u, id);
349 bch2_inode_opt_set(dst_u, id, src);
356 int bch2_rename_trans(struct btree_trans *trans,
357 subvol_inum src_dir, struct bch_inode_unpacked *src_dir_u,
358 subvol_inum dst_dir, struct bch_inode_unpacked *dst_dir_u,
359 struct bch_inode_unpacked *src_inode_u,
360 struct bch_inode_unpacked *dst_inode_u,
361 const struct qstr *src_name,
362 const struct qstr *dst_name,
363 enum bch_rename_mode mode)
365 struct bch_fs *c = trans->c;
366 struct btree_iter src_dir_iter = { NULL };
367 struct btree_iter dst_dir_iter = { NULL };
368 struct btree_iter src_inode_iter = { NULL };
369 struct btree_iter dst_inode_iter = { NULL };
370 struct bch_hash_info src_hash, dst_hash;
371 subvol_inum src_inum, dst_inum;
372 u64 src_offset, dst_offset;
373 u64 now = bch2_current_time(c);
376 ret = bch2_inode_peek(trans, &src_dir_iter, src_dir_u, src_dir,
381 src_hash = bch2_hash_info_init(c, src_dir_u);
383 if (dst_dir.inum != src_dir.inum ||
384 dst_dir.subvol != src_dir.subvol) {
385 ret = bch2_inode_peek(trans, &dst_dir_iter, dst_dir_u, dst_dir,
390 dst_hash = bch2_hash_info_init(c, dst_dir_u);
392 dst_dir_u = src_dir_u;
396 ret = bch2_dirent_rename(trans,
399 src_name, &src_inum, &src_offset,
400 dst_name, &dst_inum, &dst_offset,
405 ret = bch2_inode_peek(trans, &src_inode_iter, src_inode_u, src_inum,
411 ret = bch2_inode_peek(trans, &dst_inode_iter, dst_inode_u, dst_inum,
417 if (c->sb.version >= bcachefs_metadata_version_inode_backpointers) {
418 src_inode_u->bi_dir = dst_dir_u->bi_inum;
419 src_inode_u->bi_dir_offset = dst_offset;
421 if (mode == BCH_RENAME_EXCHANGE) {
422 dst_inode_u->bi_dir = src_dir_u->bi_inum;
423 dst_inode_u->bi_dir_offset = src_offset;
426 if (mode == BCH_RENAME_OVERWRITE &&
427 dst_inode_u->bi_dir == dst_dir_u->bi_inum &&
428 dst_inode_u->bi_dir_offset == src_offset) {
429 dst_inode_u->bi_dir = 0;
430 dst_inode_u->bi_dir_offset = 0;
434 if (mode == BCH_RENAME_OVERWRITE) {
435 if (S_ISDIR(src_inode_u->bi_mode) !=
436 S_ISDIR(dst_inode_u->bi_mode)) {
441 if (S_ISDIR(dst_inode_u->bi_mode) &&
442 bch2_empty_dir_trans(trans, dst_inum)) {
448 if (bch2_reinherit_attrs(src_inode_u, dst_dir_u) &&
449 S_ISDIR(src_inode_u->bi_mode)) {
454 if (mode == BCH_RENAME_EXCHANGE &&
455 bch2_reinherit_attrs(dst_inode_u, src_dir_u) &&
456 S_ISDIR(dst_inode_u->bi_mode)) {
461 if (is_subdir_for_nlink(src_inode_u)) {
462 src_dir_u->bi_nlink--;
463 dst_dir_u->bi_nlink++;
466 if (dst_inum.inum && is_subdir_for_nlink(dst_inode_u)) {
467 dst_dir_u->bi_nlink--;
468 src_dir_u->bi_nlink += mode == BCH_RENAME_EXCHANGE;
471 if (mode == BCH_RENAME_OVERWRITE)
472 bch2_inode_nlink_dec(trans, dst_inode_u);
474 src_dir_u->bi_mtime = now;
475 src_dir_u->bi_ctime = now;
477 if (src_dir.inum != dst_dir.inum) {
478 dst_dir_u->bi_mtime = now;
479 dst_dir_u->bi_ctime = now;
482 src_inode_u->bi_ctime = now;
485 dst_inode_u->bi_ctime = now;
487 ret = bch2_inode_write(trans, &src_dir_iter, src_dir_u) ?:
488 (src_dir.inum != dst_dir.inum
489 ? bch2_inode_write(trans, &dst_dir_iter, dst_dir_u)
491 bch2_inode_write(trans, &src_inode_iter, src_inode_u) ?:
493 ? bch2_inode_write(trans, &dst_inode_iter, dst_inode_u)
496 bch2_trans_iter_exit(trans, &dst_inode_iter);
497 bch2_trans_iter_exit(trans, &src_inode_iter);
498 bch2_trans_iter_exit(trans, &dst_dir_iter);
499 bch2_trans_iter_exit(trans, &src_dir_iter);