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