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