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