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