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