1 // SPDX-License-Identifier: GPL-2.0
3 #include "bkey_on_stack.h"
4 #include "btree_update.h"
10 #include <linux/sched/signal.h>
12 /* reflink pointers */
14 const char *bch2_reflink_p_invalid(const struct bch_fs *c, struct bkey_s_c k)
16 struct bkey_s_c_reflink_p p = bkey_s_c_to_reflink_p(k);
18 if (bkey_val_bytes(p.k) != sizeof(*p.v))
19 return "incorrect value size";
24 void bch2_reflink_p_to_text(struct printbuf *out, struct bch_fs *c,
27 struct bkey_s_c_reflink_p p = bkey_s_c_to_reflink_p(k);
29 pr_buf(out, "idx %llu", le64_to_cpu(p.v->idx));
32 enum merge_result bch2_reflink_p_merge(struct bch_fs *c,
33 struct bkey_s _l, struct bkey_s _r)
35 struct bkey_s_reflink_p l = bkey_s_to_reflink_p(_l);
36 struct bkey_s_reflink_p r = bkey_s_to_reflink_p(_r);
38 if (le64_to_cpu(l.v->idx) + l.k->size != le64_to_cpu(r.v->idx))
39 return BCH_MERGE_NOMERGE;
41 if ((u64) l.k->size + r.k->size > KEY_SIZE_MAX) {
42 bch2_key_resize(l.k, KEY_SIZE_MAX);
43 bch2_cut_front_s(l.k->p, _r);
44 return BCH_MERGE_PARTIAL;
47 bch2_key_resize(l.k, l.k->size + r.k->size);
49 return BCH_MERGE_MERGE;
52 /* indirect extents */
54 const char *bch2_reflink_v_invalid(const struct bch_fs *c, struct bkey_s_c k)
56 struct bkey_s_c_reflink_v r = bkey_s_c_to_reflink_v(k);
58 if (bkey_val_bytes(r.k) < sizeof(*r.v))
59 return "incorrect value size";
61 return bch2_bkey_ptrs_invalid(c, k);
64 void bch2_reflink_v_to_text(struct printbuf *out, struct bch_fs *c,
67 struct bkey_s_c_reflink_v r = bkey_s_c_to_reflink_v(k);
69 pr_buf(out, "refcount: %llu ", le64_to_cpu(r.v->refcount));
71 bch2_bkey_ptrs_to_text(out, c, k);
74 static int bch2_make_extent_indirect(struct btree_trans *trans,
75 struct btree_iter *extent_iter,
76 struct bkey_i_extent *e)
78 struct bch_fs *c = trans->c;
79 struct btree_iter *reflink_iter;
81 struct bkey_i_reflink_v *r_v;
82 struct bkey_i_reflink_p *r_p;
85 for_each_btree_key(trans, reflink_iter, BTREE_ID_REFLINK,
86 POS(0, c->reflink_hint),
87 BTREE_ITER_INTENT|BTREE_ITER_SLOTS, k, ret) {
88 if (reflink_iter->pos.inode) {
89 bch2_btree_iter_set_pos(reflink_iter, POS_MIN);
93 if (bkey_deleted(k.k) && e->k.size <= k.k->size)
100 /* rewind iter to start of hole, if necessary: */
101 bch2_btree_iter_set_pos(reflink_iter, bkey_start_pos(k.k));
103 r_v = bch2_trans_kmalloc(trans, sizeof(*r_v) + bkey_val_bytes(&e->k));
104 ret = PTR_ERR_OR_ZERO(r_v);
108 bkey_reflink_v_init(&r_v->k_i);
109 r_v->k.p = reflink_iter->pos;
110 bch2_key_resize(&r_v->k, e->k.size);
111 r_v->k.version = e->k.version;
113 set_bkey_val_u64s(&r_v->k, bkey_val_u64s(&r_v->k) +
114 bkey_val_u64s(&e->k));
116 memcpy(r_v->v.start, e->v.start, bkey_val_bytes(&e->k));
118 bch2_trans_update(trans, reflink_iter, &r_v->k_i);
120 r_p = bch2_trans_kmalloc(trans, sizeof(*r_p));
124 e->k.type = KEY_TYPE_reflink_p;
125 r_p = bkey_i_to_reflink_p(&e->k_i);
126 set_bkey_val_bytes(&r_p->k, sizeof(r_p->v));
127 r_p->v.idx = cpu_to_le64(bkey_start_offset(&r_v->k));
129 bch2_trans_update(trans, extent_iter, &r_p->k_i);
131 if (!IS_ERR(reflink_iter)) {
132 c->reflink_hint = reflink_iter->pos.offset;
133 bch2_trans_iter_put(trans, reflink_iter);
139 static struct bkey_s_c get_next_src(struct btree_iter *iter, struct bpos end)
141 struct bkey_s_c k = bch2_btree_iter_peek(iter);
144 for_each_btree_key_continue(iter, 0, k, ret) {
145 if (bkey_cmp(iter->pos, end) >= 0)
146 return bkey_s_c_null;
148 if (k.k->type == KEY_TYPE_extent ||
149 k.k->type == KEY_TYPE_reflink_p)
156 s64 bch2_remap_range(struct bch_fs *c,
157 struct bpos dst_start, struct bpos src_start,
158 u64 remap_sectors, u64 *journal_seq,
159 u64 new_i_size, s64 *i_sectors_delta)
161 struct btree_trans trans;
162 struct btree_iter *dst_iter, *src_iter;
163 struct bkey_s_c src_k;
164 BKEY_PADDED(k) new_dst;
165 struct bkey_on_stack new_src;
166 struct bpos dst_end = dst_start, src_end = src_start;
167 struct bpos dst_want, src_want;
168 u64 src_done, dst_done;
169 int ret = 0, ret2 = 0;
171 if (!percpu_ref_tryget(&c->writes))
174 bch2_check_set_feature(c, BCH_FEATURE_REFLINK);
176 dst_end.offset += remap_sectors;
177 src_end.offset += remap_sectors;
179 bkey_on_stack_init(&new_src);
180 bch2_trans_init(&trans, c, BTREE_ITER_MAX, 4096);
182 src_iter = bch2_trans_get_iter(&trans, BTREE_ID_EXTENTS, src_start,
184 dst_iter = bch2_trans_get_iter(&trans, BTREE_ID_EXTENTS, dst_start,
188 bch2_trans_reset(&trans, TRANS_RESET_MEM);
192 if (fatal_signal_pending(current)) {
197 src_k = get_next_src(src_iter, src_end);
198 ret = bkey_err(src_k);
202 src_done = bpos_min(src_iter->pos, src_end).offset -
204 dst_want = POS(dst_start.inode, dst_start.offset + src_done);
206 if (bkey_cmp(dst_iter->pos, dst_want) < 0) {
207 ret = bch2_fpunch_at(&trans, dst_iter, dst_want,
208 journal_seq, i_sectors_delta);
214 BUG_ON(bkey_cmp(dst_iter->pos, dst_want));
216 if (!bkey_cmp(dst_iter->pos, dst_end))
219 if (src_k.k->type == KEY_TYPE_extent) {
220 bkey_on_stack_reassemble(&new_src, c, src_k);
221 src_k = bkey_i_to_s_c(new_src.k);
223 bch2_cut_front(src_iter->pos, new_src.k);
224 bch2_cut_back(src_end, new_src.k);
226 ret = bch2_make_extent_indirect(&trans, src_iter,
227 bkey_i_to_extent(new_src.k));
231 BUG_ON(src_k.k->type != KEY_TYPE_reflink_p);
234 if (src_k.k->type == KEY_TYPE_reflink_p) {
235 struct bkey_s_c_reflink_p src_p =
236 bkey_s_c_to_reflink_p(src_k);
237 struct bkey_i_reflink_p *dst_p =
238 bkey_reflink_p_init(&new_dst.k);
240 u64 offset = le64_to_cpu(src_p.v->idx) +
241 (src_iter->pos.offset -
242 bkey_start_offset(src_k.k));
244 dst_p->v.idx = cpu_to_le64(offset);
249 new_dst.k.k.p = dst_iter->pos;
250 bch2_key_resize(&new_dst.k.k,
251 min(src_k.k->p.offset - src_iter->pos.offset,
252 dst_end.offset - dst_iter->pos.offset));
254 ret = bch2_extent_update(&trans, dst_iter, &new_dst.k,
256 new_i_size, i_sectors_delta);
260 dst_done = dst_iter->pos.offset - dst_start.offset;
261 src_want = POS(src_start.inode, src_start.offset + dst_done);
262 bch2_btree_iter_set_pos(src_iter, src_want);
270 BUG_ON(bkey_cmp(dst_iter->pos, dst_end));
272 BUG_ON(bkey_cmp(dst_iter->pos, dst_end) > 0);
274 dst_done = dst_iter->pos.offset - dst_start.offset;
275 new_i_size = min(dst_iter->pos.offset << 9, new_i_size);
277 bch2_trans_begin(&trans);
280 struct bch_inode_unpacked inode_u;
281 struct btree_iter *inode_iter;
283 inode_iter = bch2_inode_peek(&trans, &inode_u,
284 dst_start.inode, BTREE_ITER_INTENT);
285 ret2 = PTR_ERR_OR_ZERO(inode_iter);
288 inode_u.bi_size < new_i_size) {
289 inode_u.bi_size = new_i_size;
290 ret2 = bch2_inode_write(&trans, inode_iter, &inode_u) ?:
291 bch2_trans_commit(&trans, NULL, journal_seq, 0);
293 } while (ret2 == -EINTR);
295 ret = bch2_trans_exit(&trans) ?: ret;
296 bkey_on_stack_exit(&new_src, c);
298 percpu_ref_put(&c->writes);
300 return dst_done ?: ret ?: ret2;