git.sesse.net Git - bcachefs-tools-debian/blob - libbcachefs/fs.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 #ifndef NO_BCACHEFS_FS
   3
   4 #include "bcachefs.h"
   5 #include "acl.h"
   6 #include "bkey_buf.h"
   7 #include "btree_update.h"
   8 #include "buckets.h"
   9 #include "chardev.h"
  10 #include "dirent.h"
  11 #include "extents.h"
  12 #include "fs.h"
  13 #include "fs-common.h"
  14 #include "fs-io.h"
  15 #include "fs-ioctl.h"
  16 #include "fsck.h"
  17 #include "inode.h"
  18 #include "io.h"
  19 #include "journal.h"
  20 #include "keylist.h"
  21 #include "quota.h"
  22 #include "super.h"
  23 #include "xattr.h"
  24
  25 #include <linux/aio.h>
  26 #include <linux/backing-dev.h>
  27 #include <linux/exportfs.h>
  28 #include <linux/fiemap.h>
  29 #include <linux/module.h>
  30 #include <linux/pagemap.h>
  31 #include <linux/posix_acl.h>
  32 #include <linux/random.h>
  33 #include <linux/statfs.h>
  34 #include <linux/string.h>
  35 #include <linux/xattr.h>
  36
  37 static struct kmem_cache *bch2_inode_cache;
  38
  39 static void bch2_vfs_inode_init(struct bch_fs *,
  40                                 struct bch_inode_info *,
  41                                 struct bch_inode_unpacked *);
  42
  43 static void journal_seq_copy(struct bch_fs *c,
  44                              struct bch_inode_info *dst,
  45                              u64 journal_seq)
  46 {
  47         /*
  48          * atomic64_cmpxchg has a fallback for archs that don't support it,
  49          * cmpxchg does not:
  50          */
  51         atomic64_t *dst_seq = (void *) &dst->ei_journal_seq;
  52         u64 old, v = READ_ONCE(dst->ei_journal_seq);
  53
  54         do {
  55                 old = v;
  56
  57                 if (old >= journal_seq)
  58                         break;
  59         } while ((v = atomic64_cmpxchg(dst_seq, old, journal_seq)) != old);
  60
  61         bch2_journal_set_has_inum(&c->journal, dst->v.i_ino, journal_seq);
  62 }
  63
  64 static void __pagecache_lock_put(struct pagecache_lock *lock, long i)
  65 {
  66         BUG_ON(atomic_long_read(&lock->v) == 0);
  67
  68         if (atomic_long_sub_return_release(i, &lock->v) == 0)
  69                 wake_up_all(&lock->wait);
  70 }
  71
  72 static bool __pagecache_lock_tryget(struct pagecache_lock *lock, long i)
  73 {
  74         long v = atomic_long_read(&lock->v), old;
  75
  76         do {
  77                 old = v;
  78
  79                 if (i > 0 ? v < 0 : v > 0)
  80                         return false;
  81         } while ((v = atomic_long_cmpxchg_acquire(&lock->v,
  82                                         old, old + i)) != old);
  83         return true;
  84 }
  85
  86 static void __pagecache_lock_get(struct pagecache_lock *lock, long i)
  87 {
  88         wait_event(lock->wait, __pagecache_lock_tryget(lock, i));
  89 }
  90
  91 void bch2_pagecache_add_put(struct pagecache_lock *lock)
  92 {
  93         __pagecache_lock_put(lock, 1);
  94 }
  95
  96 bool bch2_pagecache_add_tryget(struct pagecache_lock *lock)
  97 {
  98         return __pagecache_lock_tryget(lock, 1);
  99 }
 100
 101 void bch2_pagecache_add_get(struct pagecache_lock *lock)
 102 {
 103         __pagecache_lock_get(lock, 1);
 104 }
 105
 106 void bch2_pagecache_block_put(struct pagecache_lock *lock)
 107 {
 108         __pagecache_lock_put(lock, -1);
 109 }
 110
 111 void bch2_pagecache_block_get(struct pagecache_lock *lock)
 112 {
 113         __pagecache_lock_get(lock, -1);
 114 }
 115
 116 void bch2_inode_update_after_write(struct bch_fs *c,
 117                                    struct bch_inode_info *inode,
 118                                    struct bch_inode_unpacked *bi,
 119                                    unsigned fields)
 120 {
 121         set_nlink(&inode->v, bch2_inode_nlink_get(bi));
 122         i_uid_write(&inode->v, bi->bi_uid);
 123         i_gid_write(&inode->v, bi->bi_gid);
 124         inode->v.i_mode = bi->bi_mode;
 125
 126         if (fields & ATTR_ATIME)
 127                 inode->v.i_atime = bch2_time_to_timespec(c, bi->bi_atime);
 128         if (fields & ATTR_MTIME)
 129                 inode->v.i_mtime = bch2_time_to_timespec(c, bi->bi_mtime);
 130         if (fields & ATTR_CTIME)
 131                 inode->v.i_ctime = bch2_time_to_timespec(c, bi->bi_ctime);
 132
 133         inode->ei_inode         = *bi;
 134
 135         bch2_inode_flags_to_vfs(inode);
 136 }
 137
 138 int __must_check bch2_write_inode(struct bch_fs *c,
 139                                   struct bch_inode_info *inode,
 140                                   inode_set_fn set,
 141                                   void *p, unsigned fields)
 142 {
 143         struct btree_trans trans;
 144         struct btree_iter *iter;
 145         struct bch_inode_unpacked inode_u;
 146         int ret;
 147
 148         bch2_trans_init(&trans, c, 0, 512);
 149 retry:
 150         bch2_trans_begin(&trans);
 151
 152         iter = bch2_inode_peek(&trans, &inode_u, inode->v.i_ino,
 153                                BTREE_ITER_INTENT);
 154         ret   = PTR_ERR_OR_ZERO(iter) ?:
 155                 (set ? set(inode, &inode_u, p) : 0) ?:
 156                 bch2_inode_write(&trans, iter, &inode_u) ?:
 157                 bch2_trans_commit(&trans, NULL,
 158                                   &inode->ei_journal_seq,
 159                                   BTREE_INSERT_NOFAIL);
 160
 161         /*
 162          * the btree node lock protects inode->ei_inode, not ei_update_lock;
 163          * this is important for inode updates via bchfs_write_index_update
 164          */
 165         if (!ret)
 166                 bch2_inode_update_after_write(c, inode, &inode_u, fields);
 167
 168         bch2_trans_iter_put(&trans, iter);
 169
 170         if (ret == -EINTR)
 171                 goto retry;
 172
 173         bch2_trans_exit(&trans);
 174         return ret < 0 ? ret : 0;
 175 }
 176
 177 int bch2_fs_quota_transfer(struct bch_fs *c,
 178                            struct bch_inode_info *inode,
 179                            struct bch_qid new_qid,
 180                            unsigned qtypes,
 181                            enum quota_acct_mode mode)
 182 {
 183         unsigned i;
 184         int ret;
 185
 186         qtypes &= enabled_qtypes(c);
 187
 188         for (i = 0; i < QTYP_NR; i++)
 189                 if (new_qid.q[i] == inode->ei_qid.q[i])
 190                         qtypes &= ~(1U << i);
 191
 192         if (!qtypes)
 193                 return 0;
 194
 195         mutex_lock(&inode->ei_quota_lock);
 196
 197         ret = bch2_quota_transfer(c, qtypes, new_qid,
 198                                   inode->ei_qid,
 199                                   inode->v.i_blocks +
 200                                   inode->ei_quota_reserved,
 201                                   mode);
 202         if (!ret)
 203                 for (i = 0; i < QTYP_NR; i++)
 204                         if (qtypes & (1 << i))
 205                                 inode->ei_qid.q[i] = new_qid.q[i];
 206
 207         mutex_unlock(&inode->ei_quota_lock);
 208
 209         return ret;
 210 }
 211
 212 struct inode *bch2_vfs_inode_get(struct bch_fs *c, u64 inum)
 213 {
 214         struct bch_inode_unpacked inode_u;
 215         struct bch_inode_info *inode;
 216         int ret;
 217
 218         inode = to_bch_ei(iget_locked(c->vfs_sb, inum));
 219         if (unlikely(!inode))
 220                 return ERR_PTR(-ENOMEM);
 221         if (!(inode->v.i_state & I_NEW))
 222                 return &inode->v;
 223
 224         ret = bch2_inode_find_by_inum(c, inum, &inode_u);
 225         if (ret) {
 226                 iget_failed(&inode->v);
 227                 return ERR_PTR(ret);
 228         }
 229
 230         bch2_vfs_inode_init(c, inode, &inode_u);
 231
 232         inode->ei_journal_seq = bch2_inode_journal_seq(&c->journal, inum);
 233
 234         unlock_new_inode(&inode->v);
 235
 236         return &inode->v;
 237 }
 238
 239 static int inum_test(struct inode *inode, void *p)
 240 {
 241         unsigned long *ino = p;
 242
 243         return *ino == inode->i_ino;
 244 }
 245
 246 static struct bch_inode_info *
 247 __bch2_create(struct user_namespace *mnt_userns,
 248               struct bch_inode_info *dir, struct dentry *dentry,
 249               umode_t mode, dev_t rdev, bool tmpfile)
 250 {
 251         struct bch_fs *c = dir->v.i_sb->s_fs_info;
 252         struct btree_trans trans;
 253         struct bch_inode_unpacked dir_u;
 254         struct bch_inode_info *inode, *old;
 255         struct bch_inode_unpacked inode_u;
 256         struct posix_acl *default_acl = NULL, *acl = NULL;
 257         u64 journal_seq = 0;
 258         int ret;
 259
 260         /*
 261          * preallocate acls + vfs inode before btree transaction, so that
 262          * nothing can fail after the transaction succeeds:
 263          */
 264 #ifdef CONFIG_BCACHEFS_POSIX_ACL
 265         ret = posix_acl_create(&dir->v, &mode, &default_acl, &acl);
 266         if (ret)
 267                 return ERR_PTR(ret);
 268 #endif
 269         inode = to_bch_ei(new_inode(c->vfs_sb));
 270         if (unlikely(!inode)) {
 271                 inode = ERR_PTR(-ENOMEM);
 272                 goto err;
 273         }
 274
 275         bch2_inode_init_early(c, &inode_u);
 276
 277         if (!tmpfile)
 278                 mutex_lock(&dir->ei_update_lock);
 279
 280         bch2_trans_init(&trans, c, 8,
 281                         2048 + (!tmpfile ? dentry->d_name.len : 0));
 282 retry:
 283         bch2_trans_begin(&trans);
 284
 285         ret   = bch2_create_trans(&trans, dir->v.i_ino, &dir_u, &inode_u,
 286                                   !tmpfile ? &dentry->d_name : NULL,
 287                                   from_kuid(mnt_userns, current_fsuid()),
 288                                   from_kgid(mnt_userns, current_fsgid()),
 289                                   mode, rdev,
 290                                   default_acl, acl) ?:
 291                 bch2_quota_acct(c, bch_qid(&inode_u), Q_INO, 1,
 292                                 KEY_TYPE_QUOTA_PREALLOC);
 293         if (unlikely(ret))
 294                 goto err_before_quota;
 295
 296         ret   = bch2_trans_commit(&trans, NULL, &journal_seq, 0);
 297         if (unlikely(ret)) {
 298                 bch2_quota_acct(c, bch_qid(&inode_u), Q_INO, -1,
 299                                 KEY_TYPE_QUOTA_WARN);
 300 err_before_quota:
 301                 if (ret == -EINTR)
 302                         goto retry;
 303                 goto err_trans;
 304         }
 305
 306         if (!tmpfile) {
 307                 bch2_inode_update_after_write(c, dir, &dir_u,
 308                                               ATTR_MTIME|ATTR_CTIME);
 309                 journal_seq_copy(c, dir, journal_seq);
 310                 mutex_unlock(&dir->ei_update_lock);
 311         }
 312
 313         bch2_vfs_inode_init(c, inode, &inode_u);
 314         journal_seq_copy(c, inode, journal_seq);
 315
 316         set_cached_acl(&inode->v, ACL_TYPE_ACCESS, acl);
 317         set_cached_acl(&inode->v, ACL_TYPE_DEFAULT, default_acl);
 318
 319         /*
 320          * we must insert the new inode into the inode cache before calling
 321          * bch2_trans_exit() and dropping locks, else we could race with another
 322          * thread pulling the inode in and modifying it:
 323          */
 324
 325         inode->v.i_state |= I_CREATING;
 326         old = to_bch_ei(inode_insert5(&inode->v, inode->v.i_ino,
 327                                       inum_test, NULL, &inode->v.i_ino));
 328         BUG_ON(!old);
 329
 330         if (unlikely(old != inode)) {
 331                 /*
 332                  * We raced, another process pulled the new inode into cache
 333                  * before us:
 334                  */
 335                 journal_seq_copy(c, old, journal_seq);
 336                 make_bad_inode(&inode->v);
 337                 iput(&inode->v);
 338
 339                 inode = old;
 340         } else {
 341                 /*
 342                  * we really don't want insert_inode_locked2() to be setting
 343                  * I_NEW...
 344                  */
 345                 unlock_new_inode(&inode->v);
 346         }
 347
 348         bch2_trans_exit(&trans);
 349 err:
 350         posix_acl_release(default_acl);
 351         posix_acl_release(acl);
 352         return inode;
 353 err_trans:
 354         if (!tmpfile)
 355                 mutex_unlock(&dir->ei_update_lock);
 356
 357         bch2_trans_exit(&trans);
 358         make_bad_inode(&inode->v);
 359         iput(&inode->v);
 360         inode = ERR_PTR(ret);
 361         goto err;
 362 }
 363
 364 /* methods */
 365
 366 static struct dentry *bch2_lookup(struct inode *vdir, struct dentry *dentry,
 367                                   unsigned int flags)
 368 {
 369         struct bch_fs *c = vdir->i_sb->s_fs_info;
 370         struct bch_inode_info *dir = to_bch_ei(vdir);
 371         struct bch_hash_info hash = bch2_hash_info_init(c, &dir->ei_inode);
 372         struct inode *vinode = NULL;
 373         u64 inum;
 374
 375         inum = bch2_dirent_lookup(c, dir->v.i_ino, &hash,
 376                                   &dentry->d_name);
 377
 378         if (inum)
 379                 vinode = bch2_vfs_inode_get(c, inum);
 380
 381         return d_splice_alias(vinode, dentry);
 382 }
 383
 384 static int bch2_mknod(struct user_namespace *mnt_userns,
 385                       struct inode *vdir, struct dentry *dentry,
 386                       umode_t mode, dev_t rdev)
 387 {
 388         struct bch_inode_info *inode =
 389                 __bch2_create(mnt_userns, to_bch_ei(vdir), dentry, mode, rdev, false);
 390
 391         if (IS_ERR(inode))
 392                 return PTR_ERR(inode);
 393
 394         d_instantiate(dentry, &inode->v);
 395         return 0;
 396 }
 397
 398 static int bch2_create(struct user_namespace *mnt_userns,
 399                        struct inode *vdir, struct dentry *dentry,
 400                        umode_t mode, bool excl)
 401 {
 402         return bch2_mknod(mnt_userns, vdir, dentry, mode|S_IFREG, 0);
 403 }
 404
 405 static int __bch2_link(struct bch_fs *c,
 406                        struct bch_inode_info *inode,
 407                        struct bch_inode_info *dir,
 408                        struct dentry *dentry)
 409 {
 410         struct btree_trans trans;
 411         struct bch_inode_unpacked dir_u, inode_u;
 412         int ret;
 413
 414         mutex_lock(&inode->ei_update_lock);
 415         bch2_trans_init(&trans, c, 4, 1024);
 416
 417         ret = __bch2_trans_do(&trans, NULL, &inode->ei_journal_seq, 0,
 418                         bch2_link_trans(&trans,
 419                                         dir->v.i_ino,
 420                                         inode->v.i_ino, &dir_u, &inode_u,
 421                                         &dentry->d_name));
 422
 423         if (likely(!ret)) {
 424                 BUG_ON(inode_u.bi_inum != inode->v.i_ino);
 425
 426                 journal_seq_copy(c, inode, dir->ei_journal_seq);
 427                 bch2_inode_update_after_write(c, dir, &dir_u,
 428                                               ATTR_MTIME|ATTR_CTIME);
 429                 bch2_inode_update_after_write(c, inode, &inode_u, ATTR_CTIME);
 430         }
 431
 432         bch2_trans_exit(&trans);
 433         mutex_unlock(&inode->ei_update_lock);
 434         return ret;
 435 }
 436
 437 static int bch2_link(struct dentry *old_dentry, struct inode *vdir,
 438                      struct dentry *dentry)
 439 {
 440         struct bch_fs *c = vdir->i_sb->s_fs_info;
 441         struct bch_inode_info *dir = to_bch_ei(vdir);
 442         struct bch_inode_info *inode = to_bch_ei(old_dentry->d_inode);
 443         int ret;
 444
 445         lockdep_assert_held(&inode->v.i_rwsem);
 446
 447         ret = __bch2_link(c, inode, dir, dentry);
 448         if (unlikely(ret))
 449                 return ret;
 450
 451         ihold(&inode->v);
 452         d_instantiate(dentry, &inode->v);
 453         return 0;
 454 }
 455
 456 static int bch2_unlink(struct inode *vdir, struct dentry *dentry)
 457 {
 458         struct bch_fs *c = vdir->i_sb->s_fs_info;
 459         struct bch_inode_info *dir = to_bch_ei(vdir);
 460         struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
 461         struct bch_inode_unpacked dir_u, inode_u;
 462         struct btree_trans trans;
 463         int ret;
 464
 465         bch2_lock_inodes(INODE_UPDATE_LOCK, dir, inode);
 466         bch2_trans_init(&trans, c, 4, 1024);
 467
 468         ret = __bch2_trans_do(&trans, NULL, &dir->ei_journal_seq,
 469                               BTREE_INSERT_NOFAIL,
 470                         bch2_unlink_trans(&trans,
 471                                           dir->v.i_ino, &dir_u,
 472                                           &inode_u, &dentry->d_name));
 473
 474         if (likely(!ret)) {
 475                 BUG_ON(inode_u.bi_inum != inode->v.i_ino);
 476
 477                 journal_seq_copy(c, inode, dir->ei_journal_seq);
 478                 bch2_inode_update_after_write(c, dir, &dir_u,
 479                                               ATTR_MTIME|ATTR_CTIME);
 480                 bch2_inode_update_after_write(c, inode, &inode_u,
 481                                               ATTR_MTIME);
 482         }
 483
 484         bch2_trans_exit(&trans);
 485         bch2_unlock_inodes(INODE_UPDATE_LOCK, dir, inode);
 486
 487         return ret;
 488 }
 489
 490 static int bch2_symlink(struct user_namespace *mnt_userns,
 491                         struct inode *vdir, struct dentry *dentry,
 492                         const char *symname)
 493 {
 494         struct bch_fs *c = vdir->i_sb->s_fs_info;
 495         struct bch_inode_info *dir = to_bch_ei(vdir), *inode;
 496         int ret;
 497
 498         inode = __bch2_create(mnt_userns, dir, dentry, S_IFLNK|S_IRWXUGO, 0, true);
 499         if (unlikely(IS_ERR(inode)))
 500                 return PTR_ERR(inode);
 501
 502         inode_lock(&inode->v);
 503         ret = page_symlink(&inode->v, symname, strlen(symname) + 1);
 504         inode_unlock(&inode->v);
 505
 506         if (unlikely(ret))
 507                 goto err;
 508
 509         ret = filemap_write_and_wait_range(inode->v.i_mapping, 0, LLONG_MAX);
 510         if (unlikely(ret))
 511                 goto err;
 512
 513         journal_seq_copy(c, dir, inode->ei_journal_seq);
 514
 515         ret = __bch2_link(c, inode, dir, dentry);
 516         if (unlikely(ret))
 517                 goto err;
 518
 519         d_instantiate(dentry, &inode->v);
 520         return 0;
 521 err:
 522         iput(&inode->v);
 523         return ret;
 524 }
 525
 526 static int bch2_mkdir(struct user_namespace *mnt_userns,
 527                       struct inode *vdir, struct dentry *dentry, umode_t mode)
 528 {
 529         return bch2_mknod(mnt_userns, vdir, dentry, mode|S_IFDIR, 0);
 530 }
 531
 532 static int bch2_rename2(struct user_namespace *mnt_userns,
 533                         struct inode *src_vdir, struct dentry *src_dentry,
 534                         struct inode *dst_vdir, struct dentry *dst_dentry,
 535                         unsigned flags)
 536 {
 537         struct bch_fs *c = src_vdir->i_sb->s_fs_info;
 538         struct bch_inode_info *src_dir = to_bch_ei(src_vdir);
 539         struct bch_inode_info *dst_dir = to_bch_ei(dst_vdir);
 540         struct bch_inode_info *src_inode = to_bch_ei(src_dentry->d_inode);
 541         struct bch_inode_info *dst_inode = to_bch_ei(dst_dentry->d_inode);
 542         struct bch_inode_unpacked dst_dir_u, src_dir_u;
 543         struct bch_inode_unpacked src_inode_u, dst_inode_u;
 544         struct btree_trans trans;
 545         enum bch_rename_mode mode = flags & RENAME_EXCHANGE
 546                 ? BCH_RENAME_EXCHANGE
 547                 : dst_dentry->d_inode
 548                 ? BCH_RENAME_OVERWRITE : BCH_RENAME;
 549         u64 journal_seq = 0;
 550         int ret;
 551
 552         if (flags & ~(RENAME_NOREPLACE|RENAME_EXCHANGE))
 553                 return -EINVAL;
 554
 555         if (mode == BCH_RENAME_OVERWRITE) {
 556                 ret = filemap_write_and_wait_range(src_inode->v.i_mapping,
 557                                                    0, LLONG_MAX);
 558                 if (ret)
 559                         return ret;
 560         }
 561
 562         bch2_trans_init(&trans, c, 8, 2048);
 563
 564         bch2_lock_inodes(INODE_UPDATE_LOCK,
 565                          src_dir,
 566                          dst_dir,
 567                          src_inode,
 568                          dst_inode);
 569
 570         if (inode_attr_changing(dst_dir, src_inode, Inode_opt_project)) {
 571                 ret = bch2_fs_quota_transfer(c, src_inode,
 572                                              dst_dir->ei_qid,
 573                                              1 << QTYP_PRJ,
 574                                              KEY_TYPE_QUOTA_PREALLOC);
 575                 if (ret)
 576                         goto err;
 577         }
 578
 579         if (mode == BCH_RENAME_EXCHANGE &&
 580             inode_attr_changing(src_dir, dst_inode, Inode_opt_project)) {
 581                 ret = bch2_fs_quota_transfer(c, dst_inode,
 582                                              src_dir->ei_qid,
 583                                              1 << QTYP_PRJ,
 584                                              KEY_TYPE_QUOTA_PREALLOC);
 585                 if (ret)
 586                         goto err;
 587         }
 588
 589         ret = __bch2_trans_do(&trans, NULL, &journal_seq, 0,
 590                         bch2_rename_trans(&trans,
 591                                           src_dir->v.i_ino, &src_dir_u,
 592                                           dst_dir->v.i_ino, &dst_dir_u,
 593                                           &src_inode_u,
 594                                           &dst_inode_u,
 595                                           &src_dentry->d_name,
 596                                           &dst_dentry->d_name,
 597                                           mode));
 598         if (unlikely(ret))
 599                 goto err;
 600
 601         BUG_ON(src_inode->v.i_ino != src_inode_u.bi_inum);
 602         BUG_ON(dst_inode &&
 603                dst_inode->v.i_ino != dst_inode_u.bi_inum);
 604
 605         bch2_inode_update_after_write(c, src_dir, &src_dir_u,
 606                                       ATTR_MTIME|ATTR_CTIME);
 607         journal_seq_copy(c, src_dir, journal_seq);
 608
 609         if (src_dir != dst_dir) {
 610                 bch2_inode_update_after_write(c, dst_dir, &dst_dir_u,
 611                                               ATTR_MTIME|ATTR_CTIME);
 612                 journal_seq_copy(c, dst_dir, journal_seq);
 613         }
 614
 615         bch2_inode_update_after_write(c, src_inode, &src_inode_u,
 616                                       ATTR_CTIME);
 617         journal_seq_copy(c, src_inode, journal_seq);
 618
 619         if (dst_inode) {
 620                 bch2_inode_update_after_write(c, dst_inode, &dst_inode_u,
 621                                               ATTR_CTIME);
 622                 journal_seq_copy(c, dst_inode, journal_seq);
 623         }
 624 err:
 625         bch2_trans_exit(&trans);
 626
 627         bch2_fs_quota_transfer(c, src_inode,
 628                                bch_qid(&src_inode->ei_inode),
 629                                1 << QTYP_PRJ,
 630                                KEY_TYPE_QUOTA_NOCHECK);
 631         if (dst_inode)
 632                 bch2_fs_quota_transfer(c, dst_inode,
 633                                        bch_qid(&dst_inode->ei_inode),
 634                                        1 << QTYP_PRJ,
 635                                        KEY_TYPE_QUOTA_NOCHECK);
 636
 637         bch2_unlock_inodes(INODE_UPDATE_LOCK,
 638                            src_dir,
 639                            dst_dir,
 640                            src_inode,
 641                            dst_inode);
 642
 643         return ret;
 644 }
 645
 646 static void bch2_setattr_copy(struct user_namespace *mnt_userns,
 647                               struct bch_inode_info *inode,
 648                               struct bch_inode_unpacked *bi,
 649                               struct iattr *attr)
 650 {
 651         struct bch_fs *c = inode->v.i_sb->s_fs_info;
 652         unsigned int ia_valid = attr->ia_valid;
 653
 654         if (ia_valid & ATTR_UID)
 655                 bi->bi_uid = from_kuid(mnt_userns, attr->ia_uid);
 656         if (ia_valid & ATTR_GID)
 657                 bi->bi_gid = from_kgid(mnt_userns, attr->ia_gid);
 658
 659         if (ia_valid & ATTR_SIZE)
 660                 bi->bi_size = attr->ia_size;
 661
 662         if (ia_valid & ATTR_ATIME)
 663                 bi->bi_atime = timespec_to_bch2_time(c, attr->ia_atime);
 664         if (ia_valid & ATTR_MTIME)
 665                 bi->bi_mtime = timespec_to_bch2_time(c, attr->ia_mtime);
 666         if (ia_valid & ATTR_CTIME)
 667                 bi->bi_ctime = timespec_to_bch2_time(c, attr->ia_ctime);
 668
 669         if (ia_valid & ATTR_MODE) {
 670                 umode_t mode = attr->ia_mode;
 671                 kgid_t gid = ia_valid & ATTR_GID
 672                         ? attr->ia_gid
 673                         : inode->v.i_gid;
 674
 675                 if (!in_group_p(gid) &&
 676                     !capable_wrt_inode_uidgid(mnt_userns, &inode->v, CAP_FSETID))
 677                         mode &= ~S_ISGID;
 678                 bi->bi_mode = mode;
 679         }
 680 }
 681
 682 int bch2_setattr_nonsize(struct user_namespace *mnt_userns,
 683                          struct bch_inode_info *inode,
 684                          struct iattr *attr)
 685 {
 686         struct bch_fs *c = inode->v.i_sb->s_fs_info;
 687         struct bch_qid qid;
 688         struct btree_trans trans;
 689         struct btree_iter *inode_iter;
 690         struct bch_inode_unpacked inode_u;
 691         struct posix_acl *acl = NULL;
 692         int ret;
 693
 694         mutex_lock(&inode->ei_update_lock);
 695
 696         qid = inode->ei_qid;
 697
 698         if (attr->ia_valid & ATTR_UID)
 699                 qid.q[QTYP_USR] = from_kuid(&init_user_ns, attr->ia_uid);
 700
 701         if (attr->ia_valid & ATTR_GID)
 702                 qid.q[QTYP_GRP] = from_kgid(&init_user_ns, attr->ia_gid);
 703
 704         ret = bch2_fs_quota_transfer(c, inode, qid, ~0,
 705                                      KEY_TYPE_QUOTA_PREALLOC);
 706         if (ret)
 707                 goto err;
 708
 709         bch2_trans_init(&trans, c, 0, 0);
 710 retry:
 711         bch2_trans_begin(&trans);
 712         kfree(acl);
 713         acl = NULL;
 714
 715         inode_iter = bch2_inode_peek(&trans, &inode_u, inode->v.i_ino,
 716                                      BTREE_ITER_INTENT);
 717         ret = PTR_ERR_OR_ZERO(inode_iter);
 718         if (ret)
 719                 goto btree_err;
 720
 721         bch2_setattr_copy(mnt_userns, inode, &inode_u, attr);
 722
 723         if (attr->ia_valid & ATTR_MODE) {
 724                 ret = bch2_acl_chmod(&trans, &inode_u, inode_u.bi_mode, &acl);
 725                 if (ret)
 726                         goto btree_err;
 727         }
 728
 729         ret =   bch2_inode_write(&trans, inode_iter, &inode_u) ?:
 730                 bch2_trans_commit(&trans, NULL,
 731                                   &inode->ei_journal_seq,
 732                                   BTREE_INSERT_NOFAIL);
 733 btree_err:
 734         bch2_trans_iter_put(&trans, inode_iter);
 735
 736         if (ret == -EINTR)
 737                 goto retry;
 738         if (unlikely(ret))
 739                 goto err_trans;
 740
 741         bch2_inode_update_after_write(c, inode, &inode_u, attr->ia_valid);
 742
 743         if (acl)
 744                 set_cached_acl(&inode->v, ACL_TYPE_ACCESS, acl);
 745 err_trans:
 746         bch2_trans_exit(&trans);
 747 err:
 748         mutex_unlock(&inode->ei_update_lock);
 749
 750         return ret;
 751 }
 752
 753 static int bch2_getattr(struct user_namespace *mnt_userns,
 754                         const struct path *path, struct kstat *stat,
 755                         u32 request_mask, unsigned query_flags)
 756 {
 757         struct bch_inode_info *inode = to_bch_ei(d_inode(path->dentry));
 758         struct bch_fs *c = inode->v.i_sb->s_fs_info;
 759
 760         stat->dev       = inode->v.i_sb->s_dev;
 761         stat->ino       = inode->v.i_ino;
 762         stat->mode      = inode->v.i_mode;
 763         stat->nlink     = inode->v.i_nlink;
 764         stat->uid       = inode->v.i_uid;
 765         stat->gid       = inode->v.i_gid;
 766         stat->rdev      = inode->v.i_rdev;
 767         stat->size      = i_size_read(&inode->v);
 768         stat->atime     = inode->v.i_atime;
 769         stat->mtime     = inode->v.i_mtime;
 770         stat->ctime     = inode->v.i_ctime;
 771         stat->blksize   = block_bytes(c);
 772         stat->blocks    = inode->v.i_blocks;
 773
 774         if (request_mask & STATX_BTIME) {
 775                 stat->result_mask |= STATX_BTIME;
 776                 stat->btime = bch2_time_to_timespec(c, inode->ei_inode.bi_otime);
 777         }
 778
 779         if (inode->ei_inode.bi_flags & BCH_INODE_IMMUTABLE)
 780                 stat->attributes |= STATX_ATTR_IMMUTABLE;
 781         stat->attributes_mask    |= STATX_ATTR_IMMUTABLE;
 782
 783         if (inode->ei_inode.bi_flags & BCH_INODE_APPEND)
 784                 stat->attributes |= STATX_ATTR_APPEND;
 785         stat->attributes_mask    |= STATX_ATTR_APPEND;
 786
 787         if (inode->ei_inode.bi_flags & BCH_INODE_NODUMP)
 788                 stat->attributes |= STATX_ATTR_NODUMP;
 789         stat->attributes_mask    |= STATX_ATTR_NODUMP;
 790
 791         return 0;
 792 }
 793
 794 static int bch2_setattr(struct user_namespace *mnt_userns,
 795                         struct dentry *dentry, struct iattr *iattr)
 796 {
 797         struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
 798         int ret;
 799
 800         lockdep_assert_held(&inode->v.i_rwsem);
 801
 802         ret = setattr_prepare(mnt_userns, dentry, iattr);
 803         if (ret)
 804                 return ret;
 805
 806         return iattr->ia_valid & ATTR_SIZE
 807                 ? bch2_truncate(mnt_userns, inode, iattr)
 808                 : bch2_setattr_nonsize(mnt_userns, inode, iattr);
 809 }
 810
 811 static int bch2_tmpfile(struct user_namespace *mnt_userns,
 812                         struct inode *vdir, struct dentry *dentry, umode_t mode)
 813 {
 814         struct bch_inode_info *inode =
 815                 __bch2_create(mnt_userns, to_bch_ei(vdir), dentry, mode, 0, true);
 816
 817         if (IS_ERR(inode))
 818                 return PTR_ERR(inode);
 819
 820         d_mark_tmpfile(dentry, &inode->v);
 821         d_instantiate(dentry, &inode->v);
 822         return 0;
 823 }
 824
 825 static int bch2_fill_extent(struct bch_fs *c,
 826                             struct fiemap_extent_info *info,
 827                             struct bkey_s_c k, unsigned flags)
 828 {
 829         if (bkey_extent_is_direct_data(k.k)) {
 830                 struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
 831                 const union bch_extent_entry *entry;
 832                 struct extent_ptr_decoded p;
 833                 int ret;
 834
 835                 if (k.k->type == KEY_TYPE_reflink_v)
 836                         flags |= FIEMAP_EXTENT_SHARED;
 837
 838                 bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
 839                         int flags2 = 0;
 840                         u64 offset = p.ptr.offset;
 841
 842                         if (p.crc.compression_type)
 843                                 flags2 |= FIEMAP_EXTENT_ENCODED;
 844                         else
 845                                 offset += p.crc.offset;
 846
 847                         if ((offset & (c->opts.block_size - 1)) ||
 848                             (k.k->size & (c->opts.block_size - 1)))
 849                                 flags2 |= FIEMAP_EXTENT_NOT_ALIGNED;
 850
 851                         ret = fiemap_fill_next_extent(info,
 852                                                 bkey_start_offset(k.k) << 9,
 853                                                 offset << 9,
 854                                                 k.k->size << 9, flags|flags2);
 855                         if (ret)
 856                                 return ret;
 857                 }
 858
 859                 return 0;
 860         } else if (bkey_extent_is_inline_data(k.k)) {
 861                 return fiemap_fill_next_extent(info,
 862                                                bkey_start_offset(k.k) << 9,
 863                                                0, k.k->size << 9,
 864                                                flags|
 865                                                FIEMAP_EXTENT_DATA_INLINE);
 866         } else if (k.k->type == KEY_TYPE_reservation) {
 867                 return fiemap_fill_next_extent(info,
 868                                                bkey_start_offset(k.k) << 9,
 869                                                0, k.k->size << 9,
 870                                                flags|
 871                                                FIEMAP_EXTENT_DELALLOC|
 872                                                FIEMAP_EXTENT_UNWRITTEN);
 873         } else {
 874                 BUG();
 875         }
 876 }
 877
 878 static int bch2_fiemap(struct inode *vinode, struct fiemap_extent_info *info,
 879                        u64 start, u64 len)
 880 {
 881         struct bch_fs *c = vinode->i_sb->s_fs_info;
 882         struct bch_inode_info *ei = to_bch_ei(vinode);
 883         struct btree_trans trans;
 884         struct btree_iter *iter;
 885         struct bkey_s_c k;
 886         struct bkey_buf cur, prev;
 887         struct bpos end = POS(ei->v.i_ino, (start + len) >> 9);
 888         unsigned offset_into_extent, sectors;
 889         bool have_extent = false;
 890         int ret = 0;
 891
 892         ret = fiemap_prep(&ei->v, info, start, &len, FIEMAP_FLAG_SYNC);
 893         if (ret)
 894                 return ret;
 895
 896         if (start + len < start)
 897                 return -EINVAL;
 898
 899         bch2_bkey_buf_init(&cur);
 900         bch2_bkey_buf_init(&prev);
 901         bch2_trans_init(&trans, c, 0, 0);
 902
 903         iter = bch2_trans_get_iter(&trans, BTREE_ID_extents,
 904                                    POS(ei->v.i_ino, start >> 9), 0);
 905 retry:
 906         bch2_trans_begin(&trans);
 907
 908         while ((k = bch2_btree_iter_peek(iter)).k &&
 909                !(ret = bkey_err(k)) &&
 910                bkey_cmp(iter->pos, end) < 0) {
 911                 enum btree_id data_btree = BTREE_ID_extents;
 912
 913                 if (!bkey_extent_is_data(k.k) &&
 914                     k.k->type != KEY_TYPE_reservation) {
 915                         bch2_btree_iter_advance(iter);
 916                         continue;
 917                 }
 918
 919                 offset_into_extent      = iter->pos.offset -
 920                         bkey_start_offset(k.k);
 921                 sectors                 = k.k->size - offset_into_extent;
 922
 923                 bch2_bkey_buf_reassemble(&cur, c, k);
 924
 925                 ret = bch2_read_indirect_extent(&trans, &data_btree,
 926                                         &offset_into_extent, &cur);
 927                 if (ret)
 928                         break;
 929
 930                 k = bkey_i_to_s_c(cur.k);
 931                 bch2_bkey_buf_realloc(&prev, c, k.k->u64s);
 932
 933                 sectors = min(sectors, k.k->size - offset_into_extent);
 934
 935                 bch2_cut_front(POS(k.k->p.inode,
 936                                    bkey_start_offset(k.k) +
 937                                    offset_into_extent),
 938                                cur.k);
 939                 bch2_key_resize(&cur.k->k, sectors);
 940                 cur.k->k.p = iter->pos;
 941                 cur.k->k.p.offset += cur.k->k.size;
 942
 943                 if (have_extent) {
 944                         ret = bch2_fill_extent(c, info,
 945                                         bkey_i_to_s_c(prev.k), 0);
 946                         if (ret)
 947                                 break;
 948                 }
 949
 950                 bkey_copy(prev.k, cur.k);
 951                 have_extent = true;
 952
 953                 bch2_btree_iter_set_pos(iter,
 954                         POS(iter->pos.inode, iter->pos.offset + sectors));
 955         }
 956
 957         if (ret == -EINTR)
 958                 goto retry;
 959
 960         if (!ret && have_extent)
 961                 ret = bch2_fill_extent(c, info, bkey_i_to_s_c(prev.k),
 962                                        FIEMAP_EXTENT_LAST);
 963
 964         bch2_trans_iter_put(&trans, iter);
 965         ret = bch2_trans_exit(&trans) ?: ret;
 966         bch2_bkey_buf_exit(&cur, c);
 967         bch2_bkey_buf_exit(&prev, c);
 968         return ret < 0 ? ret : 0;
 969 }
 970
 971 static const struct vm_operations_struct bch_vm_ops = {
 972         .fault          = bch2_page_fault,
 973         .map_pages      = filemap_map_pages,
 974         .page_mkwrite   = bch2_page_mkwrite,
 975 };
 976
 977 static int bch2_mmap(struct file *file, struct vm_area_struct *vma)
 978 {
 979         file_accessed(file);
 980
 981         vma->vm_ops = &bch_vm_ops;
 982         return 0;
 983 }
 984
 985 /* Directories: */
 986
 987 static loff_t bch2_dir_llseek(struct file *file, loff_t offset, int whence)
 988 {
 989         return generic_file_llseek_size(file, offset, whence,
 990                                         S64_MAX, S64_MAX);
 991 }
 992
 993 static int bch2_vfs_readdir(struct file *file, struct dir_context *ctx)
 994 {
 995         struct bch_inode_info *inode = file_bch_inode(file);
 996         struct bch_fs *c = inode->v.i_sb->s_fs_info;
 997
 998         if (!dir_emit_dots(file, ctx))
 999                 return 0;
1000
1001         return bch2_readdir(c, inode->v.i_ino, ctx);
1002 }
1003
1004 static const struct file_operations bch_file_operations = {
1005         .llseek         = bch2_llseek,
1006         .read_iter      = bch2_read_iter,
1007         .write_iter     = bch2_write_iter,
1008         .mmap           = bch2_mmap,
1009         .open           = generic_file_open,
1010         .fsync          = bch2_fsync,
1011         .splice_read    = generic_file_splice_read,
1012         .splice_write   = iter_file_splice_write,
1013         .fallocate      = bch2_fallocate_dispatch,
1014         .unlocked_ioctl = bch2_fs_file_ioctl,
1015 #ifdef CONFIG_COMPAT
1016         .compat_ioctl   = bch2_compat_fs_ioctl,
1017 #endif
1018         .remap_file_range = bch2_remap_file_range,
1019 };
1020
1021 static const struct inode_operations bch_file_inode_operations = {
1022         .getattr        = bch2_getattr,
1023         .setattr        = bch2_setattr,
1024         .fiemap         = bch2_fiemap,
1025         .listxattr      = bch2_xattr_list,
1026 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1027         .get_acl        = bch2_get_acl,
1028         .set_acl        = bch2_set_acl,
1029 #endif
1030 };
1031
1032 static const struct inode_operations bch_dir_inode_operations = {
1033         .lookup         = bch2_lookup,
1034         .create         = bch2_create,
1035         .link           = bch2_link,
1036         .unlink         = bch2_unlink,
1037         .symlink        = bch2_symlink,
1038         .mkdir          = bch2_mkdir,
1039         .rmdir          = bch2_unlink,
1040         .mknod          = bch2_mknod,
1041         .rename         = bch2_rename2,
1042         .getattr        = bch2_getattr,
1043         .setattr        = bch2_setattr,
1044         .tmpfile        = bch2_tmpfile,
1045         .listxattr      = bch2_xattr_list,
1046 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1047         .get_acl        = bch2_get_acl,
1048         .set_acl        = bch2_set_acl,
1049 #endif
1050 };
1051
1052 static const struct file_operations bch_dir_file_operations = {
1053         .llseek         = bch2_dir_llseek,
1054         .read           = generic_read_dir,
1055         .iterate_shared = bch2_vfs_readdir,
1056         .fsync          = bch2_fsync,
1057         .unlocked_ioctl = bch2_fs_file_ioctl,
1058 #ifdef CONFIG_COMPAT
1059         .compat_ioctl   = bch2_compat_fs_ioctl,
1060 #endif
1061 };
1062
1063 static const struct inode_operations bch_symlink_inode_operations = {
1064         .get_link       = page_get_link,
1065         .getattr        = bch2_getattr,
1066         .setattr        = bch2_setattr,
1067         .listxattr      = bch2_xattr_list,
1068 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1069         .get_acl        = bch2_get_acl,
1070         .set_acl        = bch2_set_acl,
1071 #endif
1072 };
1073
1074 static const struct inode_operations bch_special_inode_operations = {
1075         .getattr        = bch2_getattr,
1076         .setattr        = bch2_setattr,
1077         .listxattr      = bch2_xattr_list,
1078 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1079         .get_acl        = bch2_get_acl,
1080         .set_acl        = bch2_set_acl,
1081 #endif
1082 };
1083
1084 static const struct address_space_operations bch_address_space_operations = {
1085         .writepage      = bch2_writepage,
1086         .readpage       = bch2_readpage,
1087         .writepages     = bch2_writepages,
1088         .readahead      = bch2_readahead,
1089         .set_page_dirty = __set_page_dirty_nobuffers,
1090         .write_begin    = bch2_write_begin,
1091         .write_end      = bch2_write_end,
1092         .invalidatepage = bch2_invalidatepage,
1093         .releasepage    = bch2_releasepage,
1094         .direct_IO      = noop_direct_IO,
1095 #ifdef CONFIG_MIGRATION
1096         .migratepage    = bch2_migrate_page,
1097 #endif
1098         .error_remove_page = generic_error_remove_page,
1099 };
1100
1101 static struct inode *bch2_nfs_get_inode(struct super_block *sb,
1102                 u64 ino, u32 generation)
1103 {
1104         struct bch_fs *c = sb->s_fs_info;
1105         struct inode *vinode;
1106
1107         if (ino < BCACHEFS_ROOT_INO)
1108                 return ERR_PTR(-ESTALE);
1109
1110         vinode = bch2_vfs_inode_get(c, ino);
1111         if (IS_ERR(vinode))
1112                 return ERR_CAST(vinode);
1113         if (generation && vinode->i_generation != generation) {
1114                 /* we didn't find the right inode.. */
1115                 iput(vinode);
1116                 return ERR_PTR(-ESTALE);
1117         }
1118         return vinode;
1119 }
1120
1121 static struct dentry *bch2_fh_to_dentry(struct super_block *sb, struct fid *fid,
1122                 int fh_len, int fh_type)
1123 {
1124         return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
1125                                     bch2_nfs_get_inode);
1126 }
1127
1128 static struct dentry *bch2_fh_to_parent(struct super_block *sb, struct fid *fid,
1129                 int fh_len, int fh_type)
1130 {
1131         return generic_fh_to_parent(sb, fid, fh_len, fh_type,
1132                                     bch2_nfs_get_inode);
1133 }
1134
1135 static const struct export_operations bch_export_ops = {
1136         .fh_to_dentry   = bch2_fh_to_dentry,
1137         .fh_to_parent   = bch2_fh_to_parent,
1138         //.get_parent   = bch2_get_parent,
1139 };
1140
1141 static void bch2_vfs_inode_init(struct bch_fs *c,
1142                                 struct bch_inode_info *inode,
1143                                 struct bch_inode_unpacked *bi)
1144 {
1145         bch2_inode_update_after_write(c, inode, bi, ~0);
1146
1147         inode->v.i_blocks       = bi->bi_sectors;
1148         inode->v.i_ino          = bi->bi_inum;
1149         inode->v.i_rdev         = bi->bi_dev;
1150         inode->v.i_generation   = bi->bi_generation;
1151         inode->v.i_size         = bi->bi_size;
1152
1153         inode->ei_flags         = 0;
1154         inode->ei_journal_seq   = 0;
1155         inode->ei_quota_reserved = 0;
1156         inode->ei_qid           = bch_qid(bi);
1157
1158         inode->v.i_mapping->a_ops = &bch_address_space_operations;
1159
1160         switch (inode->v.i_mode & S_IFMT) {
1161         case S_IFREG:
1162                 inode->v.i_op   = &bch_file_inode_operations;
1163                 inode->v.i_fop  = &bch_file_operations;
1164                 break;
1165         case S_IFDIR:
1166                 inode->v.i_op   = &bch_dir_inode_operations;
1167                 inode->v.i_fop  = &bch_dir_file_operations;
1168                 break;
1169         case S_IFLNK:
1170                 inode_nohighmem(&inode->v);
1171                 inode->v.i_op   = &bch_symlink_inode_operations;
1172                 break;
1173         default:
1174                 init_special_inode(&inode->v, inode->v.i_mode, inode->v.i_rdev);
1175                 inode->v.i_op   = &bch_special_inode_operations;
1176                 break;
1177         }
1178 }
1179
1180 static struct inode *bch2_alloc_inode(struct super_block *sb)
1181 {
1182         struct bch_inode_info *inode;
1183
1184         inode = kmem_cache_alloc(bch2_inode_cache, GFP_NOFS);
1185         if (!inode)
1186                 return NULL;
1187
1188         inode_init_once(&inode->v);
1189         mutex_init(&inode->ei_update_lock);
1190         pagecache_lock_init(&inode->ei_pagecache_lock);
1191         mutex_init(&inode->ei_quota_lock);
1192         inode->ei_journal_seq = 0;
1193
1194         return &inode->v;
1195 }
1196
1197 static void bch2_i_callback(struct rcu_head *head)
1198 {
1199         struct inode *vinode = container_of(head, struct inode, i_rcu);
1200         struct bch_inode_info *inode = to_bch_ei(vinode);
1201
1202         kmem_cache_free(bch2_inode_cache, inode);
1203 }
1204
1205 static void bch2_destroy_inode(struct inode *vinode)
1206 {
1207         call_rcu(&vinode->i_rcu, bch2_i_callback);
1208 }
1209
1210 static int inode_update_times_fn(struct bch_inode_info *inode,
1211                                  struct bch_inode_unpacked *bi,
1212                                  void *p)
1213 {
1214         struct bch_fs *c = inode->v.i_sb->s_fs_info;
1215
1216         bi->bi_atime    = timespec_to_bch2_time(c, inode->v.i_atime);
1217         bi->bi_mtime    = timespec_to_bch2_time(c, inode->v.i_mtime);
1218         bi->bi_ctime    = timespec_to_bch2_time(c, inode->v.i_ctime);
1219
1220         return 0;
1221 }
1222
1223 static int bch2_vfs_write_inode(struct inode *vinode,
1224                                 struct writeback_control *wbc)
1225 {
1226         struct bch_fs *c = vinode->i_sb->s_fs_info;
1227         struct bch_inode_info *inode = to_bch_ei(vinode);
1228         int ret;
1229
1230         mutex_lock(&inode->ei_update_lock);
1231         ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
1232                                ATTR_ATIME|ATTR_MTIME|ATTR_CTIME);
1233         mutex_unlock(&inode->ei_update_lock);
1234
1235         return ret;
1236 }
1237
1238 static void bch2_evict_inode(struct inode *vinode)
1239 {
1240         struct bch_fs *c = vinode->i_sb->s_fs_info;
1241         struct bch_inode_info *inode = to_bch_ei(vinode);
1242
1243         truncate_inode_pages_final(&inode->v.i_data);
1244
1245         clear_inode(&inode->v);
1246
1247         BUG_ON(!is_bad_inode(&inode->v) && inode->ei_quota_reserved);
1248
1249         if (!inode->v.i_nlink && !is_bad_inode(&inode->v)) {
1250                 bch2_quota_acct(c, inode->ei_qid, Q_SPC, -((s64) inode->v.i_blocks),
1251                                 KEY_TYPE_QUOTA_WARN);
1252                 bch2_quota_acct(c, inode->ei_qid, Q_INO, -1,
1253                                 KEY_TYPE_QUOTA_WARN);
1254                 bch2_inode_rm(c, inode->v.i_ino, true);
1255         }
1256 }
1257
1258 static int bch2_statfs(struct dentry *dentry, struct kstatfs *buf)
1259 {
1260         struct super_block *sb = dentry->d_sb;
1261         struct bch_fs *c = sb->s_fs_info;
1262         struct bch_fs_usage_short usage = bch2_fs_usage_read_short(c);
1263         unsigned shift = sb->s_blocksize_bits - 9;
1264         /*
1265          * this assumes inodes take up 64 bytes, which is a decent average
1266          * number:
1267          */
1268         u64 avail_inodes = ((usage.capacity - usage.used) << 3);
1269         u64 fsid;
1270
1271         buf->f_type     = BCACHEFS_STATFS_MAGIC;
1272         buf->f_bsize    = sb->s_blocksize;
1273         buf->f_blocks   = usage.capacity >> shift;
1274         buf->f_bfree    = usage.free >> shift;
1275         buf->f_bavail   = avail_factor(usage.free) >> shift;
1276
1277         buf->f_files    = usage.nr_inodes + avail_inodes;
1278         buf->f_ffree    = avail_inodes;
1279
1280         fsid = le64_to_cpup((void *) c->sb.user_uuid.b) ^
1281                le64_to_cpup((void *) c->sb.user_uuid.b + sizeof(u64));
1282         buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1283         buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1284         buf->f_namelen  = BCH_NAME_MAX;
1285
1286         return 0;
1287 }
1288
1289 static int bch2_sync_fs(struct super_block *sb, int wait)
1290 {
1291         struct bch_fs *c = sb->s_fs_info;
1292
1293         if (c->opts.journal_flush_disabled)
1294                 return 0;
1295
1296         if (!wait) {
1297                 bch2_journal_flush_async(&c->journal, NULL);
1298                 return 0;
1299         }
1300
1301         return bch2_journal_flush(&c->journal);
1302 }
1303
1304 static struct bch_fs *bch2_path_to_fs(const char *path)
1305 {
1306         struct bch_fs *c;
1307         dev_t dev;
1308         int ret;
1309
1310         ret = lookup_bdev(path, &dev);
1311         if (ret)
1312                 return ERR_PTR(ret);
1313
1314         c = bch2_dev_to_fs(dev);
1315         if (c)
1316                 closure_put(&c->cl);
1317         return c ?: ERR_PTR(-ENOENT);
1318 }
1319
1320 static char **split_devs(const char *_dev_name, unsigned *nr)
1321 {
1322         char *dev_name = NULL, **devs = NULL, *s;
1323         size_t i, nr_devs = 0;
1324
1325         dev_name = kstrdup(_dev_name, GFP_KERNEL);
1326         if (!dev_name)
1327                 return NULL;
1328
1329         for (s = dev_name; s; s = strchr(s + 1, ':'))
1330                 nr_devs++;
1331
1332         devs = kcalloc(nr_devs + 1, sizeof(const char *), GFP_KERNEL);
1333         if (!devs) {
1334                 kfree(dev_name);
1335                 return NULL;
1336         }
1337
1338         for (i = 0, s = dev_name;
1339              s;
1340              (s = strchr(s, ':')) && (*s++ = '\0'))
1341                 devs[i++] = s;
1342
1343         *nr = nr_devs;
1344         return devs;
1345 }
1346
1347 static int bch2_remount(struct super_block *sb, int *flags, char *data)
1348 {
1349         struct bch_fs *c = sb->s_fs_info;
1350         struct bch_opts opts = bch2_opts_empty();
1351         int ret;
1352
1353         opt_set(opts, read_only, (*flags & SB_RDONLY) != 0);
1354
1355         ret = bch2_parse_mount_opts(c, &opts, data);
1356         if (ret)
1357                 return ret;
1358
1359         if (opts.read_only != c->opts.read_only) {
1360                 down_write(&c->state_lock);
1361
1362                 if (opts.read_only) {
1363                         bch2_fs_read_only(c);
1364
1365                         sb->s_flags |= SB_RDONLY;
1366                 } else {
1367                         ret = bch2_fs_read_write(c);
1368                         if (ret) {
1369                                 bch_err(c, "error going rw: %i", ret);
1370                                 up_write(&c->state_lock);
1371                                 return -EINVAL;
1372                         }
1373
1374                         sb->s_flags &= ~SB_RDONLY;
1375                 }
1376
1377                 c->opts.read_only = opts.read_only;
1378
1379                 up_write(&c->state_lock);
1380         }
1381
1382         if (opts.errors >= 0)
1383                 c->opts.errors = opts.errors;
1384
1385         return ret;
1386 }
1387
1388 static int bch2_show_devname(struct seq_file *seq, struct dentry *root)
1389 {
1390         struct bch_fs *c = root->d_sb->s_fs_info;
1391         struct bch_dev *ca;
1392         unsigned i;
1393         bool first = true;
1394
1395         for_each_online_member(ca, c, i) {
1396                 if (!first)
1397                         seq_putc(seq, ':');
1398                 first = false;
1399                 seq_puts(seq, "/dev/");
1400                 seq_puts(seq, ca->name);
1401         }
1402
1403         return 0;
1404 }
1405
1406 static int bch2_show_options(struct seq_file *seq, struct dentry *root)
1407 {
1408         struct bch_fs *c = root->d_sb->s_fs_info;
1409         enum bch_opt_id i;
1410         char buf[512];
1411
1412         for (i = 0; i < bch2_opts_nr; i++) {
1413                 const struct bch_option *opt = &bch2_opt_table[i];
1414                 u64 v = bch2_opt_get_by_id(&c->opts, i);
1415
1416                 if (!(opt->mode & OPT_MOUNT))
1417                         continue;
1418
1419                 if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
1420                         continue;
1421
1422                 bch2_opt_to_text(&PBUF(buf), c, opt, v,
1423                                  OPT_SHOW_MOUNT_STYLE);
1424                 seq_putc(seq, ',');
1425                 seq_puts(seq, buf);
1426         }
1427
1428         return 0;
1429 }
1430
1431 static void bch2_put_super(struct super_block *sb)
1432 {
1433         struct bch_fs *c = sb->s_fs_info;
1434
1435         __bch2_fs_stop(c);
1436 }
1437
1438 static const struct super_operations bch_super_operations = {
1439         .alloc_inode    = bch2_alloc_inode,
1440         .destroy_inode  = bch2_destroy_inode,
1441         .write_inode    = bch2_vfs_write_inode,
1442         .evict_inode    = bch2_evict_inode,
1443         .sync_fs        = bch2_sync_fs,
1444         .statfs         = bch2_statfs,
1445         .show_devname   = bch2_show_devname,
1446         .show_options   = bch2_show_options,
1447         .remount_fs     = bch2_remount,
1448         .put_super      = bch2_put_super,
1449 #if 0
1450         .freeze_fs      = bch2_freeze,
1451         .unfreeze_fs    = bch2_unfreeze,
1452 #endif
1453 };
1454
1455 static int bch2_set_super(struct super_block *s, void *data)
1456 {
1457         s->s_fs_info = data;
1458         return 0;
1459 }
1460
1461 static int bch2_noset_super(struct super_block *s, void *data)
1462 {
1463         return -EBUSY;
1464 }
1465
1466 static int bch2_test_super(struct super_block *s, void *data)
1467 {
1468         struct bch_fs *c = s->s_fs_info;
1469         struct bch_fs **devs = data;
1470         unsigned i;
1471
1472         if (!c)
1473                 return false;
1474
1475         for (i = 0; devs[i]; i++)
1476                 if (c != devs[i])
1477                         return false;
1478         return true;
1479 }
1480
1481 static struct dentry *bch2_mount(struct file_system_type *fs_type,
1482                                  int flags, const char *dev_name, void *data)
1483 {
1484         struct bch_fs *c;
1485         struct bch_dev *ca;
1486         struct super_block *sb;
1487         struct inode *vinode;
1488         struct bch_opts opts = bch2_opts_empty();
1489         char **devs;
1490         struct bch_fs **devs_to_fs = NULL;
1491         unsigned i, nr_devs;
1492         int ret;
1493
1494         opt_set(opts, read_only, (flags & SB_RDONLY) != 0);
1495
1496         ret = bch2_parse_mount_opts(NULL, &opts, data);
1497         if (ret)
1498                 return ERR_PTR(ret);
1499
1500         if (!dev_name || strlen(dev_name) == 0)
1501                 return ERR_PTR(-EINVAL);
1502
1503         devs = split_devs(dev_name, &nr_devs);
1504         if (!devs)
1505                 return ERR_PTR(-ENOMEM);
1506
1507         devs_to_fs = kcalloc(nr_devs + 1, sizeof(void *), GFP_KERNEL);
1508         if (!devs_to_fs) {
1509                 sb = ERR_PTR(-ENOMEM);
1510                 goto got_sb;
1511         }
1512
1513         for (i = 0; i < nr_devs; i++)
1514                 devs_to_fs[i] = bch2_path_to_fs(devs[i]);
1515
1516         sb = sget(fs_type, bch2_test_super, bch2_noset_super,
1517                   flags|SB_NOSEC, devs_to_fs);
1518         if (!IS_ERR(sb))
1519                 goto got_sb;
1520
1521         c = bch2_fs_open(devs, nr_devs, opts);
1522         if (IS_ERR(c)) {
1523                 sb = ERR_CAST(c);
1524                 goto got_sb;
1525         }
1526
1527         /* Some options can't be parsed until after the fs is started: */
1528         ret = bch2_parse_mount_opts(c, &opts, data);
1529         if (ret) {
1530                 bch2_fs_stop(c);
1531                 sb = ERR_PTR(ret);
1532                 goto got_sb;
1533         }
1534
1535         bch2_opts_apply(&c->opts, opts);
1536
1537         sb = sget(fs_type, NULL, bch2_set_super, flags|SB_NOSEC, c);
1538         if (IS_ERR(sb))
1539                 bch2_fs_stop(c);
1540 got_sb:
1541         kfree(devs_to_fs);
1542         kfree(devs[0]);
1543         kfree(devs);
1544
1545         if (IS_ERR(sb))
1546                 return ERR_CAST(sb);
1547
1548         c = sb->s_fs_info;
1549
1550         if (sb->s_root) {
1551                 if ((flags ^ sb->s_flags) & SB_RDONLY) {
1552                         ret = -EBUSY;
1553                         goto err_put_super;
1554                 }
1555                 goto out;
1556         }
1557
1558         sb->s_blocksize         = block_bytes(c);
1559         sb->s_blocksize_bits    = ilog2(block_bytes(c));
1560         sb->s_maxbytes          = MAX_LFS_FILESIZE;
1561         sb->s_op                = &bch_super_operations;
1562         sb->s_export_op         = &bch_export_ops;
1563 #ifdef CONFIG_BCACHEFS_QUOTA
1564         sb->s_qcop              = &bch2_quotactl_operations;
1565         sb->s_quota_types       = QTYPE_MASK_USR|QTYPE_MASK_GRP|QTYPE_MASK_PRJ;
1566 #endif
1567         sb->s_xattr             = bch2_xattr_handlers;
1568         sb->s_magic             = BCACHEFS_STATFS_MAGIC;
1569         sb->s_time_gran         = c->sb.nsec_per_time_unit;
1570         sb->s_time_min          = div_s64(S64_MIN, c->sb.time_units_per_sec) + 1;
1571         sb->s_time_max          = div_s64(S64_MAX, c->sb.time_units_per_sec);
1572         c->vfs_sb               = sb;
1573         strlcpy(sb->s_id, c->name, sizeof(sb->s_id));
1574
1575         ret = super_setup_bdi(sb);
1576         if (ret)
1577                 goto err_put_super;
1578
1579         sb->s_bdi->ra_pages             = VM_READAHEAD_PAGES;
1580
1581         for_each_online_member(ca, c, i) {
1582                 struct block_device *bdev = ca->disk_sb.bdev;
1583
1584                 /* XXX: create an anonymous device for multi device filesystems */
1585                 sb->s_bdev      = bdev;
1586                 sb->s_dev       = bdev->bd_dev;
1587                 percpu_ref_put(&ca->io_ref);
1588                 break;
1589         }
1590
1591         c->dev = sb->s_dev;
1592
1593 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1594         if (c->opts.acl)
1595                 sb->s_flags     |= SB_POSIXACL;
1596 #endif
1597
1598         vinode = bch2_vfs_inode_get(c, BCACHEFS_ROOT_INO);
1599         if (IS_ERR(vinode)) {
1600                 bch_err(c, "error mounting: error getting root inode %i",
1601                         (int) PTR_ERR(vinode));
1602                 ret = PTR_ERR(vinode);
1603                 goto err_put_super;
1604         }
1605
1606         sb->s_root = d_make_root(vinode);
1607         if (!sb->s_root) {
1608                 bch_err(c, "error mounting: error allocating root dentry");
1609                 ret = -ENOMEM;
1610                 goto err_put_super;
1611         }
1612
1613         sb->s_flags |= SB_ACTIVE;
1614 out:
1615         return dget(sb->s_root);
1616
1617 err_put_super:
1618         deactivate_locked_super(sb);
1619         return ERR_PTR(ret);
1620 }
1621
1622 static void bch2_kill_sb(struct super_block *sb)
1623 {
1624         struct bch_fs *c = sb->s_fs_info;
1625
1626         generic_shutdown_super(sb);
1627         bch2_fs_free(c);
1628 }
1629
1630 static struct file_system_type bcache_fs_type = {
1631         .owner          = THIS_MODULE,
1632         .name           = "bcachefs",
1633         .mount          = bch2_mount,
1634         .kill_sb        = bch2_kill_sb,
1635         .fs_flags       = FS_REQUIRES_DEV,
1636 };
1637
1638 MODULE_ALIAS_FS("bcachefs");
1639
1640 void bch2_vfs_exit(void)
1641 {
1642         unregister_filesystem(&bcache_fs_type);
1643         if (bch2_inode_cache)
1644                 kmem_cache_destroy(bch2_inode_cache);
1645 }
1646
1647 int __init bch2_vfs_init(void)
1648 {
1649         int ret = -ENOMEM;
1650
1651         bch2_inode_cache = KMEM_CACHE(bch_inode_info, 0);
1652         if (!bch2_inode_cache)
1653                 goto err;
1654
1655         ret = register_filesystem(&bcache_fs_type);
1656         if (ret)
1657                 goto err;
1658
1659         return 0;
1660 err:
1661         bch2_vfs_exit();
1662         return ret;
1663 }
1664
1665 #endif /* NO_BCACHEFS_FS */