git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/fs-common.c

   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 = NULL;
  23         struct btree_iter *inode_iter = NULL;
  24         struct bch_hash_info hash = bch2_hash_info_init(c, new_inode);
  25         u64 now = bch2_current_time(c);
  26         u64 cpu = raw_smp_processor_id();
  27         u64 dir_offset = 0;
  28         int ret;
  29
  30         dir_iter = bch2_inode_peek(trans, dir_u, dir_inum, BTREE_ITER_INTENT);
  31         ret = PTR_ERR_OR_ZERO(dir_iter);
  32         if (ret)
  33                 goto err;
  34
  35         bch2_inode_init_late(new_inode, now, uid, gid, mode, rdev, dir_u);
  36
  37         if (!name)
  38                 new_inode->bi_flags |= BCH_INODE_UNLINKED;
  39
  40         inode_iter = bch2_inode_create(trans, new_inode, U32_MAX, cpu);
  41         ret = PTR_ERR_OR_ZERO(inode_iter);
  42         if (ret)
  43                 goto err;
  44
  45         if (default_acl) {
  46                 ret = bch2_set_acl_trans(trans, new_inode, &hash,
  47                                          default_acl, ACL_TYPE_DEFAULT);
  48                 if (ret)
  49                         goto err;
  50         }
  51
  52         if (acl) {
  53                 ret = bch2_set_acl_trans(trans, new_inode, &hash,
  54                                          acl, ACL_TYPE_ACCESS);
  55                 if (ret)
  56                         goto err;
  57         }
  58
  59         if (name) {
  60                 struct bch_hash_info dir_hash = bch2_hash_info_init(c, dir_u);
  61                 dir_u->bi_mtime = dir_u->bi_ctime = now;
  62
  63                 if (S_ISDIR(new_inode->bi_mode))
  64                         dir_u->bi_nlink++;
  65
  66                 ret = bch2_inode_write(trans, dir_iter, dir_u);
  67                 if (ret)
  68                         goto err;
  69
  70                 ret = bch2_dirent_create(trans, dir_inum, &dir_hash,
  71                                          mode_to_type(new_inode->bi_mode),
  72                                          name, new_inode->bi_inum,
  73                                          &dir_offset,
  74                                          BCH_HASH_SET_MUST_CREATE);
  75                 if (ret)
  76                         goto err;
  77         }
  78
  79         if (c->sb.version >= bcachefs_metadata_version_inode_backpointers) {
  80                 new_inode->bi_dir               = dir_u->bi_inum;
  81                 new_inode->bi_dir_offset        = dir_offset;
  82         }
  83
  84         /* XXX use bch2_btree_iter_set_snapshot() */
  85         inode_iter->snapshot = U32_MAX;
  86         bch2_btree_iter_set_pos(inode_iter, SPOS(0, new_inode->bi_inum, U32_MAX));
  87
  88         ret   = bch2_btree_iter_traverse(inode_iter) ?:
  89                 bch2_inode_write(trans, inode_iter, new_inode);
  90 err:
  91         bch2_trans_iter_put(trans, inode_iter);
  92         bch2_trans_iter_put(trans, dir_iter);
  93         return ret;
  94 }
  95
  96 int bch2_link_trans(struct btree_trans *trans, u64 dir_inum,
  97                     u64 inum, struct bch_inode_unpacked *dir_u,
  98                     struct bch_inode_unpacked *inode_u, const struct qstr *name)
  99 {
 100         struct bch_fs *c = trans->c;
 101         struct btree_iter *dir_iter = NULL, *inode_iter = NULL;
 102         struct bch_hash_info dir_hash;
 103         u64 now = bch2_current_time(c);
 104         u64 dir_offset = 0;
 105         int ret;
 106
 107         inode_iter = bch2_inode_peek(trans, inode_u, inum, BTREE_ITER_INTENT);
 108         ret = PTR_ERR_OR_ZERO(inode_iter);
 109         if (ret)
 110                 goto err;
 111
 112         inode_u->bi_ctime = now;
 113         bch2_inode_nlink_inc(inode_u);
 114
 115         dir_iter = bch2_inode_peek(trans, dir_u, dir_inum, 0);
 116         ret = PTR_ERR_OR_ZERO(dir_iter);
 117         if (ret)
 118                 goto err;
 119
 120         dir_u->bi_mtime = dir_u->bi_ctime = now;
 121
 122         dir_hash = bch2_hash_info_init(c, dir_u);
 123
 124         ret = bch2_dirent_create(trans, dir_inum, &dir_hash,
 125                                  mode_to_type(inode_u->bi_mode),
 126                                  name, inum, &dir_offset,
 127                                  BCH_HASH_SET_MUST_CREATE);
 128         if (ret)
 129                 goto err;
 130
 131         if (c->sb.version >= bcachefs_metadata_version_inode_backpointers) {
 132                 inode_u->bi_dir         = dir_inum;
 133                 inode_u->bi_dir_offset  = dir_offset;
 134         }
 135
 136         ret =   bch2_inode_write(trans, dir_iter, dir_u) ?:
 137                 bch2_inode_write(trans, inode_iter, inode_u);
 138 err:
 139         bch2_trans_iter_put(trans, dir_iter);
 140         bch2_trans_iter_put(trans, inode_iter);
 141         return ret;
 142 }
 143
 144 int bch2_unlink_trans(struct btree_trans *trans,
 145                       u64 dir_inum, struct bch_inode_unpacked *dir_u,
 146                       struct bch_inode_unpacked *inode_u,
 147                       const struct qstr *name)
 148 {
 149         struct bch_fs *c = trans->c;
 150         struct btree_iter *dir_iter = NULL, *dirent_iter = NULL,
 151                           *inode_iter = NULL;
 152         struct bch_hash_info dir_hash;
 153         u64 inum, now = bch2_current_time(c);
 154         struct bkey_s_c k;
 155         int ret;
 156
 157         dir_iter = bch2_inode_peek(trans, dir_u, dir_inum, BTREE_ITER_INTENT);
 158         ret = PTR_ERR_OR_ZERO(dir_iter);
 159         if (ret)
 160                 goto err;
 161
 162         dir_hash = bch2_hash_info_init(c, dir_u);
 163
 164         dirent_iter = __bch2_dirent_lookup_trans(trans, dir_inum, &dir_hash,
 165                                                  name, BTREE_ITER_INTENT);
 166         ret = PTR_ERR_OR_ZERO(dirent_iter);
 167         if (ret)
 168                 goto err;
 169
 170         k = bch2_btree_iter_peek_slot(dirent_iter);
 171         ret = bkey_err(k);
 172         if (ret)
 173                 goto err;
 174
 175         inum = le64_to_cpu(bkey_s_c_to_dirent(k).v->d_inum);
 176
 177         inode_iter = bch2_inode_peek(trans, inode_u, inum, BTREE_ITER_INTENT);
 178         ret = PTR_ERR_OR_ZERO(inode_iter);
 179         if (ret)
 180                 goto err;
 181
 182         if (inode_u->bi_dir             == k.k->p.inode &&
 183             inode_u->bi_dir_offset      == k.k->p.offset) {
 184                 inode_u->bi_dir         = 0;
 185                 inode_u->bi_dir_offset  = 0;
 186         }
 187
 188         dir_u->bi_mtime = dir_u->bi_ctime = inode_u->bi_ctime = now;
 189         dir_u->bi_nlink -= S_ISDIR(inode_u->bi_mode);
 190         bch2_inode_nlink_dec(inode_u);
 191
 192         ret =   (S_ISDIR(inode_u->bi_mode)
 193                  ? bch2_empty_dir_trans(trans, inum)
 194                  : 0) ?:
 195                 bch2_dirent_delete_at(trans, &dir_hash, dirent_iter) ?:
 196                 bch2_inode_write(trans, dir_iter, dir_u) ?:
 197                 bch2_inode_write(trans, inode_iter, inode_u);
 198 err:
 199         bch2_trans_iter_put(trans, inode_iter);
 200         bch2_trans_iter_put(trans, dirent_iter);
 201         bch2_trans_iter_put(trans, dir_iter);
 202         return ret;
 203 }
 204
 205 bool bch2_reinherit_attrs(struct bch_inode_unpacked *dst_u,
 206                           struct bch_inode_unpacked *src_u)
 207 {
 208         u64 src, dst;
 209         unsigned id;
 210         bool ret = false;
 211
 212         for (id = 0; id < Inode_opt_nr; id++) {
 213                 if (dst_u->bi_fields_set & (1 << id))
 214                         continue;
 215
 216                 src = bch2_inode_opt_get(src_u, id);
 217                 dst = bch2_inode_opt_get(dst_u, id);
 218
 219                 if (src == dst)
 220                         continue;
 221
 222                 bch2_inode_opt_set(dst_u, id, src);
 223                 ret = true;
 224         }
 225
 226         return ret;
 227 }
 228
 229 int bch2_rename_trans(struct btree_trans *trans,
 230                       u64 src_dir, struct bch_inode_unpacked *src_dir_u,
 231                       u64 dst_dir, struct bch_inode_unpacked *dst_dir_u,
 232                       struct bch_inode_unpacked *src_inode_u,
 233                       struct bch_inode_unpacked *dst_inode_u,
 234                       const struct qstr *src_name,
 235                       const struct qstr *dst_name,
 236                       enum bch_rename_mode mode)
 237 {
 238         struct bch_fs *c = trans->c;
 239         struct btree_iter *src_dir_iter = NULL, *dst_dir_iter = NULL;
 240         struct btree_iter *src_inode_iter = NULL, *dst_inode_iter = NULL;
 241         struct bch_hash_info src_hash, dst_hash;
 242         u64 src_inode, src_offset, dst_inode, dst_offset;
 243         u64 now = bch2_current_time(c);
 244         int ret;
 245
 246         src_dir_iter = bch2_inode_peek(trans, src_dir_u, src_dir,
 247                                        BTREE_ITER_INTENT);
 248         ret = PTR_ERR_OR_ZERO(src_dir_iter);
 249         if (ret)
 250                 goto err;
 251
 252         src_hash = bch2_hash_info_init(c, src_dir_u);
 253
 254         if (dst_dir != src_dir) {
 255                 dst_dir_iter = bch2_inode_peek(trans, dst_dir_u, dst_dir,
 256                                                BTREE_ITER_INTENT);
 257                 ret = PTR_ERR_OR_ZERO(dst_dir_iter);
 258                 if (ret)
 259                         goto err;
 260
 261                 dst_hash = bch2_hash_info_init(c, dst_dir_u);
 262         } else {
 263                 dst_dir_u = src_dir_u;
 264                 dst_hash = src_hash;
 265         }
 266
 267         ret = bch2_dirent_rename(trans,
 268                                  src_dir, &src_hash,
 269                                  dst_dir, &dst_hash,
 270                                  src_name, &src_inode, &src_offset,
 271                                  dst_name, &dst_inode, &dst_offset,
 272                                  mode);
 273         if (ret)
 274                 goto err;
 275
 276         src_inode_iter = bch2_inode_peek(trans, src_inode_u, src_inode,
 277                                          BTREE_ITER_INTENT);
 278         ret = PTR_ERR_OR_ZERO(src_inode_iter);
 279         if (ret)
 280                 goto err;
 281
 282         if (dst_inode) {
 283                 dst_inode_iter = bch2_inode_peek(trans, dst_inode_u, dst_inode,
 284                                                  BTREE_ITER_INTENT);
 285                 ret = PTR_ERR_OR_ZERO(dst_inode_iter);
 286                 if (ret)
 287                         goto err;
 288         }
 289
 290         if (c->sb.version >= bcachefs_metadata_version_inode_backpointers) {
 291                 src_inode_u->bi_dir             = dst_dir_u->bi_inum;
 292                 src_inode_u->bi_dir_offset      = dst_offset;
 293
 294                 if (mode == BCH_RENAME_EXCHANGE) {
 295                         dst_inode_u->bi_dir             = src_dir_u->bi_inum;
 296                         dst_inode_u->bi_dir_offset      = src_offset;
 297                 }
 298
 299                 if (mode == BCH_RENAME_OVERWRITE &&
 300                     dst_inode_u->bi_dir         == dst_dir_u->bi_inum &&
 301                     dst_inode_u->bi_dir_offset  == src_offset) {
 302                         dst_inode_u->bi_dir             = 0;
 303                         dst_inode_u->bi_dir_offset      = 0;
 304                 }
 305         }
 306
 307         if (mode == BCH_RENAME_OVERWRITE) {
 308                 if (S_ISDIR(src_inode_u->bi_mode) !=
 309                     S_ISDIR(dst_inode_u->bi_mode)) {
 310                         ret = -ENOTDIR;
 311                         goto err;
 312                 }
 313
 314                 if (S_ISDIR(dst_inode_u->bi_mode) &&
 315                     bch2_empty_dir_trans(trans, dst_inode)) {
 316                         ret = -ENOTEMPTY;
 317                         goto err;
 318                 }
 319         }
 320
 321         if (bch2_reinherit_attrs(src_inode_u, dst_dir_u) &&
 322             S_ISDIR(src_inode_u->bi_mode)) {
 323                 ret = -EXDEV;
 324                 goto err;
 325         }
 326
 327         if (mode == BCH_RENAME_EXCHANGE &&
 328             bch2_reinherit_attrs(dst_inode_u, src_dir_u) &&
 329             S_ISDIR(dst_inode_u->bi_mode)) {
 330                 ret = -EXDEV;
 331                 goto err;
 332         }
 333
 334         if (S_ISDIR(src_inode_u->bi_mode)) {
 335                 src_dir_u->bi_nlink--;
 336                 dst_dir_u->bi_nlink++;
 337         }
 338
 339         if (dst_inode && S_ISDIR(dst_inode_u->bi_mode)) {
 340                 dst_dir_u->bi_nlink--;
 341                 src_dir_u->bi_nlink += mode == BCH_RENAME_EXCHANGE;
 342         }
 343
 344         if (mode == BCH_RENAME_OVERWRITE)
 345                 bch2_inode_nlink_dec(dst_inode_u);
 346
 347         src_dir_u->bi_mtime             = now;
 348         src_dir_u->bi_ctime             = now;
 349
 350         if (src_dir != dst_dir) {
 351                 dst_dir_u->bi_mtime     = now;
 352                 dst_dir_u->bi_ctime     = now;
 353         }
 354
 355         src_inode_u->bi_ctime           = now;
 356
 357         if (dst_inode)
 358                 dst_inode_u->bi_ctime   = now;
 359
 360         ret =   bch2_inode_write(trans, src_dir_iter, src_dir_u) ?:
 361                 (src_dir != dst_dir
 362                  ? bch2_inode_write(trans, dst_dir_iter, dst_dir_u)
 363                  : 0 ) ?:
 364                 bch2_inode_write(trans, src_inode_iter, src_inode_u) ?:
 365                 (dst_inode
 366                  ? bch2_inode_write(trans, dst_inode_iter, dst_inode_u)
 367                  : 0 );
 368 err:
 369         bch2_trans_iter_put(trans, dst_inode_iter);
 370         bch2_trans_iter_put(trans, src_inode_iter);
 371         bch2_trans_iter_put(trans, dst_dir_iter);
 372         bch2_trans_iter_put(trans, src_dir_iter);
 373         return ret;
 374 }