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