1 // SPDX-License-Identifier: GPL-2.0
7 #include "btree_update.h"
14 #include "fs-common.h"
17 #include "fs-io-buffered.h"
18 #include "fs-io-direct.h"
19 #include "fs-io-pagecache.h"
30 #include <linux/aio.h>
31 #include <linux/backing-dev.h>
32 #include <linux/exportfs.h>
33 #include <linux/fiemap.h>
34 #include <linux/module.h>
35 #include <linux/pagemap.h>
36 #include <linux/posix_acl.h>
37 #include <linux/random.h>
38 #include <linux/seq_file.h>
39 #include <linux/statfs.h>
40 #include <linux/string.h>
41 #include <linux/xattr.h>
43 static struct kmem_cache *bch2_inode_cache;
45 static void bch2_vfs_inode_init(struct btree_trans *, subvol_inum,
46 struct bch_inode_info *,
47 struct bch_inode_unpacked *,
48 struct bch_subvolume *);
50 void bch2_inode_update_after_write(struct btree_trans *trans,
51 struct bch_inode_info *inode,
52 struct bch_inode_unpacked *bi,
55 struct bch_fs *c = trans->c;
57 BUG_ON(bi->bi_inum != inode->v.i_ino);
59 bch2_assert_pos_locked(trans, BTREE_ID_inodes,
61 c->opts.inodes_use_key_cache);
63 set_nlink(&inode->v, bch2_inode_nlink_get(bi));
64 i_uid_write(&inode->v, bi->bi_uid);
65 i_gid_write(&inode->v, bi->bi_gid);
66 inode->v.i_mode = bi->bi_mode;
68 if (fields & ATTR_ATIME)
69 inode_set_atime_to_ts(&inode->v, bch2_time_to_timespec(c, bi->bi_atime));
70 if (fields & ATTR_MTIME)
71 inode_set_mtime_to_ts(&inode->v, bch2_time_to_timespec(c, bi->bi_mtime));
72 if (fields & ATTR_CTIME)
73 inode_set_ctime_to_ts(&inode->v, bch2_time_to_timespec(c, bi->bi_ctime));
75 inode->ei_inode = *bi;
77 bch2_inode_flags_to_vfs(inode);
80 int __must_check bch2_write_inode(struct bch_fs *c,
81 struct bch_inode_info *inode,
83 void *p, unsigned fields)
85 struct btree_trans *trans = bch2_trans_get(c);
86 struct btree_iter iter = { NULL };
87 struct bch_inode_unpacked inode_u;
90 bch2_trans_begin(trans);
92 ret = bch2_inode_peek(trans, &iter, &inode_u, inode_inum(inode),
94 (set ? set(trans, inode, &inode_u, p) : 0) ?:
95 bch2_inode_write(trans, &iter, &inode_u) ?:
96 bch2_trans_commit(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc);
99 * the btree node lock protects inode->ei_inode, not ei_update_lock;
100 * this is important for inode updates via bchfs_write_index_update
103 bch2_inode_update_after_write(trans, inode, &inode_u, fields);
105 bch2_trans_iter_exit(trans, &iter);
107 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
110 bch2_fs_fatal_err_on(bch2_err_matches(ret, ENOENT), c,
111 "inode %u:%llu not found when updating",
112 inode_inum(inode).subvol,
113 inode_inum(inode).inum);
115 bch2_trans_put(trans);
116 return ret < 0 ? ret : 0;
119 int bch2_fs_quota_transfer(struct bch_fs *c,
120 struct bch_inode_info *inode,
121 struct bch_qid new_qid,
123 enum quota_acct_mode mode)
128 qtypes &= enabled_qtypes(c);
130 for (i = 0; i < QTYP_NR; i++)
131 if (new_qid.q[i] == inode->ei_qid.q[i])
132 qtypes &= ~(1U << i);
137 mutex_lock(&inode->ei_quota_lock);
139 ret = bch2_quota_transfer(c, qtypes, new_qid,
142 inode->ei_quota_reserved,
145 for (i = 0; i < QTYP_NR; i++)
146 if (qtypes & (1 << i))
147 inode->ei_qid.q[i] = new_qid.q[i];
149 mutex_unlock(&inode->ei_quota_lock);
154 static int bch2_iget5_test(struct inode *vinode, void *p)
156 struct bch_inode_info *inode = to_bch_ei(vinode);
157 subvol_inum *inum = p;
159 return inode->ei_subvol == inum->subvol &&
160 inode->ei_inode.bi_inum == inum->inum;
163 static int bch2_iget5_set(struct inode *vinode, void *p)
165 struct bch_inode_info *inode = to_bch_ei(vinode);
166 subvol_inum *inum = p;
168 inode->v.i_ino = inum->inum;
169 inode->ei_subvol = inum->subvol;
170 inode->ei_inode.bi_inum = inum->inum;
174 static unsigned bch2_inode_hash(subvol_inum inum)
176 return jhash_3words(inum.subvol, inum.inum >> 32, inum.inum, JHASH_INITVAL);
179 struct inode *bch2_vfs_inode_get(struct bch_fs *c, subvol_inum inum)
181 struct bch_inode_unpacked inode_u;
182 struct bch_inode_info *inode;
183 struct btree_trans *trans;
184 struct bch_subvolume subvol;
187 inode = to_bch_ei(iget5_locked(c->vfs_sb,
188 bch2_inode_hash(inum),
192 if (unlikely(!inode))
193 return ERR_PTR(-ENOMEM);
194 if (!(inode->v.i_state & I_NEW))
197 trans = bch2_trans_get(c);
198 ret = lockrestart_do(trans,
199 bch2_subvolume_get(trans, inum.subvol, true, 0, &subvol) ?:
200 bch2_inode_find_by_inum_trans(trans, inum, &inode_u));
203 bch2_vfs_inode_init(trans, inum, inode, &inode_u, &subvol);
204 bch2_trans_put(trans);
207 iget_failed(&inode->v);
208 return ERR_PTR(bch2_err_class(ret));
211 mutex_lock(&c->vfs_inodes_lock);
212 list_add(&inode->ei_vfs_inode_list, &c->vfs_inodes_list);
213 mutex_unlock(&c->vfs_inodes_lock);
215 unlock_new_inode(&inode->v);
220 struct bch_inode_info *
221 __bch2_create(struct mnt_idmap *idmap,
222 struct bch_inode_info *dir, struct dentry *dentry,
223 umode_t mode, dev_t rdev, subvol_inum snapshot_src,
226 struct bch_fs *c = dir->v.i_sb->s_fs_info;
227 struct btree_trans *trans;
228 struct bch_inode_unpacked dir_u;
229 struct bch_inode_info *inode, *old;
230 struct bch_inode_unpacked inode_u;
231 struct posix_acl *default_acl = NULL, *acl = NULL;
233 struct bch_subvolume subvol;
238 * preallocate acls + vfs inode before btree transaction, so that
239 * nothing can fail after the transaction succeeds:
241 #ifdef CONFIG_BCACHEFS_POSIX_ACL
242 ret = posix_acl_create(&dir->v, &mode, &default_acl, &acl);
246 inode = to_bch_ei(new_inode(c->vfs_sb));
247 if (unlikely(!inode)) {
248 inode = ERR_PTR(-ENOMEM);
252 bch2_inode_init_early(c, &inode_u);
254 if (!(flags & BCH_CREATE_TMPFILE))
255 mutex_lock(&dir->ei_update_lock);
257 trans = bch2_trans_get(c);
259 bch2_trans_begin(trans);
261 ret = bch2_subvol_is_ro_trans(trans, dir->ei_subvol) ?:
262 bch2_create_trans(trans,
263 inode_inum(dir), &dir_u, &inode_u,
264 !(flags & BCH_CREATE_TMPFILE)
265 ? &dentry->d_name : NULL,
266 from_kuid(i_user_ns(&dir->v), current_fsuid()),
267 from_kgid(i_user_ns(&dir->v), current_fsgid()),
269 default_acl, acl, snapshot_src, flags) ?:
270 bch2_quota_acct(c, bch_qid(&inode_u), Q_INO, 1,
271 KEY_TYPE_QUOTA_PREALLOC);
273 goto err_before_quota;
275 inum.subvol = inode_u.bi_subvol ?: dir->ei_subvol;
276 inum.inum = inode_u.bi_inum;
278 ret = bch2_subvolume_get(trans, inum.subvol, true,
279 BTREE_ITER_WITH_UPDATES, &subvol) ?:
280 bch2_trans_commit(trans, NULL, &journal_seq, 0);
282 bch2_quota_acct(c, bch_qid(&inode_u), Q_INO, -1,
283 KEY_TYPE_QUOTA_WARN);
285 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
290 if (!(flags & BCH_CREATE_TMPFILE)) {
291 bch2_inode_update_after_write(trans, dir, &dir_u,
292 ATTR_MTIME|ATTR_CTIME);
293 mutex_unlock(&dir->ei_update_lock);
296 bch2_iget5_set(&inode->v, &inum);
297 bch2_vfs_inode_init(trans, inum, inode, &inode_u, &subvol);
299 set_cached_acl(&inode->v, ACL_TYPE_ACCESS, acl);
300 set_cached_acl(&inode->v, ACL_TYPE_DEFAULT, default_acl);
303 * we must insert the new inode into the inode cache before calling
304 * bch2_trans_exit() and dropping locks, else we could race with another
305 * thread pulling the inode in and modifying it:
308 inode->v.i_state |= I_CREATING;
310 old = to_bch_ei(inode_insert5(&inode->v,
311 bch2_inode_hash(inum),
317 if (unlikely(old != inode)) {
319 * We raced, another process pulled the new inode into cache
322 make_bad_inode(&inode->v);
327 mutex_lock(&c->vfs_inodes_lock);
328 list_add(&inode->ei_vfs_inode_list, &c->vfs_inodes_list);
329 mutex_unlock(&c->vfs_inodes_lock);
331 * we really don't want insert_inode_locked2() to be setting
334 unlock_new_inode(&inode->v);
337 bch2_trans_put(trans);
339 posix_acl_release(default_acl);
340 posix_acl_release(acl);
343 if (!(flags & BCH_CREATE_TMPFILE))
344 mutex_unlock(&dir->ei_update_lock);
346 bch2_trans_put(trans);
347 make_bad_inode(&inode->v);
349 inode = ERR_PTR(ret);
355 static struct dentry *bch2_lookup(struct inode *vdir, struct dentry *dentry,
358 struct bch_fs *c = vdir->i_sb->s_fs_info;
359 struct bch_inode_info *dir = to_bch_ei(vdir);
360 struct bch_hash_info hash = bch2_hash_info_init(c, &dir->ei_inode);
361 struct inode *vinode = NULL;
362 subvol_inum inum = { .subvol = 1 };
365 ret = bch2_dirent_lookup(c, inode_inum(dir), &hash,
366 &dentry->d_name, &inum);
369 vinode = bch2_vfs_inode_get(c, inum);
371 return d_splice_alias(vinode, dentry);
374 static int bch2_mknod(struct mnt_idmap *idmap,
375 struct inode *vdir, struct dentry *dentry,
376 umode_t mode, dev_t rdev)
378 struct bch_inode_info *inode =
379 __bch2_create(idmap, to_bch_ei(vdir), dentry, mode, rdev,
380 (subvol_inum) { 0 }, 0);
383 return bch2_err_class(PTR_ERR(inode));
385 d_instantiate(dentry, &inode->v);
389 static int bch2_create(struct mnt_idmap *idmap,
390 struct inode *vdir, struct dentry *dentry,
391 umode_t mode, bool excl)
393 return bch2_mknod(idmap, vdir, dentry, mode|S_IFREG, 0);
396 static int __bch2_link(struct bch_fs *c,
397 struct bch_inode_info *inode,
398 struct bch_inode_info *dir,
399 struct dentry *dentry)
401 struct btree_trans *trans = bch2_trans_get(c);
402 struct bch_inode_unpacked dir_u, inode_u;
405 mutex_lock(&inode->ei_update_lock);
407 ret = commit_do(trans, NULL, NULL, 0,
408 bch2_link_trans(trans,
409 inode_inum(dir), &dir_u,
410 inode_inum(inode), &inode_u,
414 bch2_inode_update_after_write(trans, dir, &dir_u,
415 ATTR_MTIME|ATTR_CTIME);
416 bch2_inode_update_after_write(trans, inode, &inode_u, ATTR_CTIME);
419 bch2_trans_put(trans);
420 mutex_unlock(&inode->ei_update_lock);
424 static int bch2_link(struct dentry *old_dentry, struct inode *vdir,
425 struct dentry *dentry)
427 struct bch_fs *c = vdir->i_sb->s_fs_info;
428 struct bch_inode_info *dir = to_bch_ei(vdir);
429 struct bch_inode_info *inode = to_bch_ei(old_dentry->d_inode);
432 lockdep_assert_held(&inode->v.i_rwsem);
434 ret = bch2_subvol_is_ro(c, dir->ei_subvol) ?:
435 bch2_subvol_is_ro(c, inode->ei_subvol) ?:
436 __bch2_link(c, inode, dir, dentry);
441 d_instantiate(dentry, &inode->v);
445 int __bch2_unlink(struct inode *vdir, struct dentry *dentry,
446 bool deleting_snapshot)
448 struct bch_fs *c = vdir->i_sb->s_fs_info;
449 struct bch_inode_info *dir = to_bch_ei(vdir);
450 struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
451 struct bch_inode_unpacked dir_u, inode_u;
452 struct btree_trans *trans = bch2_trans_get(c);
455 bch2_lock_inodes(INODE_UPDATE_LOCK, dir, inode);
457 ret = commit_do(trans, NULL, NULL,
458 BCH_TRANS_COMMIT_no_enospc,
459 bch2_unlink_trans(trans,
460 inode_inum(dir), &dir_u,
461 &inode_u, &dentry->d_name,
466 bch2_inode_update_after_write(trans, dir, &dir_u,
467 ATTR_MTIME|ATTR_CTIME);
468 bch2_inode_update_after_write(trans, inode, &inode_u,
471 if (inode_u.bi_subvol) {
473 * Subvolume deletion is asynchronous, but we still want to tell
474 * the VFS that it's been deleted here:
476 set_nlink(&inode->v, 0);
479 bch2_unlock_inodes(INODE_UPDATE_LOCK, dir, inode);
480 bch2_trans_put(trans);
485 static int bch2_unlink(struct inode *vdir, struct dentry *dentry)
487 struct bch_inode_info *dir= to_bch_ei(vdir);
488 struct bch_fs *c = dir->v.i_sb->s_fs_info;
490 return bch2_subvol_is_ro(c, dir->ei_subvol) ?:
491 __bch2_unlink(vdir, dentry, false);
494 static int bch2_symlink(struct mnt_idmap *idmap,
495 struct inode *vdir, struct dentry *dentry,
498 struct bch_fs *c = vdir->i_sb->s_fs_info;
499 struct bch_inode_info *dir = to_bch_ei(vdir), *inode;
502 inode = __bch2_create(idmap, dir, dentry, S_IFLNK|S_IRWXUGO, 0,
503 (subvol_inum) { 0 }, BCH_CREATE_TMPFILE);
505 return bch2_err_class(PTR_ERR(inode));
507 inode_lock(&inode->v);
508 ret = page_symlink(&inode->v, symname, strlen(symname) + 1);
509 inode_unlock(&inode->v);
514 ret = filemap_write_and_wait_range(inode->v.i_mapping, 0, LLONG_MAX);
518 ret = __bch2_link(c, inode, dir, dentry);
522 d_instantiate(dentry, &inode->v);
529 static int bch2_mkdir(struct mnt_idmap *idmap,
530 struct inode *vdir, struct dentry *dentry, umode_t mode)
532 return bch2_mknod(idmap, vdir, dentry, mode|S_IFDIR, 0);
535 static int bch2_rename2(struct mnt_idmap *idmap,
536 struct inode *src_vdir, struct dentry *src_dentry,
537 struct inode *dst_vdir, struct dentry *dst_dentry,
540 struct bch_fs *c = src_vdir->i_sb->s_fs_info;
541 struct bch_inode_info *src_dir = to_bch_ei(src_vdir);
542 struct bch_inode_info *dst_dir = to_bch_ei(dst_vdir);
543 struct bch_inode_info *src_inode = to_bch_ei(src_dentry->d_inode);
544 struct bch_inode_info *dst_inode = to_bch_ei(dst_dentry->d_inode);
545 struct bch_inode_unpacked dst_dir_u, src_dir_u;
546 struct bch_inode_unpacked src_inode_u, dst_inode_u;
547 struct btree_trans *trans;
548 enum bch_rename_mode mode = flags & RENAME_EXCHANGE
549 ? BCH_RENAME_EXCHANGE
550 : dst_dentry->d_inode
551 ? BCH_RENAME_OVERWRITE : BCH_RENAME;
554 if (flags & ~(RENAME_NOREPLACE|RENAME_EXCHANGE))
557 if (mode == BCH_RENAME_OVERWRITE) {
558 ret = filemap_write_and_wait_range(src_inode->v.i_mapping,
564 trans = bch2_trans_get(c);
566 bch2_lock_inodes(INODE_UPDATE_LOCK,
572 ret = bch2_subvol_is_ro_trans(trans, src_dir->ei_subvol) ?:
573 bch2_subvol_is_ro_trans(trans, dst_dir->ei_subvol);
577 if (inode_attr_changing(dst_dir, src_inode, Inode_opt_project)) {
578 ret = bch2_fs_quota_transfer(c, src_inode,
581 KEY_TYPE_QUOTA_PREALLOC);
586 if (mode == BCH_RENAME_EXCHANGE &&
587 inode_attr_changing(src_dir, dst_inode, Inode_opt_project)) {
588 ret = bch2_fs_quota_transfer(c, dst_inode,
591 KEY_TYPE_QUOTA_PREALLOC);
596 ret = commit_do(trans, NULL, NULL, 0,
597 bch2_rename_trans(trans,
598 inode_inum(src_dir), &src_dir_u,
599 inode_inum(dst_dir), &dst_dir_u,
608 BUG_ON(src_inode->v.i_ino != src_inode_u.bi_inum);
610 dst_inode->v.i_ino != dst_inode_u.bi_inum);
612 bch2_inode_update_after_write(trans, src_dir, &src_dir_u,
613 ATTR_MTIME|ATTR_CTIME);
615 if (src_dir != dst_dir)
616 bch2_inode_update_after_write(trans, dst_dir, &dst_dir_u,
617 ATTR_MTIME|ATTR_CTIME);
619 bch2_inode_update_after_write(trans, src_inode, &src_inode_u,
623 bch2_inode_update_after_write(trans, dst_inode, &dst_inode_u,
626 bch2_trans_put(trans);
628 bch2_fs_quota_transfer(c, src_inode,
629 bch_qid(&src_inode->ei_inode),
631 KEY_TYPE_QUOTA_NOCHECK);
633 bch2_fs_quota_transfer(c, dst_inode,
634 bch_qid(&dst_inode->ei_inode),
636 KEY_TYPE_QUOTA_NOCHECK);
638 bch2_unlock_inodes(INODE_UPDATE_LOCK,
647 static void bch2_setattr_copy(struct mnt_idmap *idmap,
648 struct bch_inode_info *inode,
649 struct bch_inode_unpacked *bi,
652 struct bch_fs *c = inode->v.i_sb->s_fs_info;
653 unsigned int ia_valid = attr->ia_valid;
655 if (ia_valid & ATTR_UID)
656 bi->bi_uid = from_kuid(i_user_ns(&inode->v), attr->ia_uid);
657 if (ia_valid & ATTR_GID)
658 bi->bi_gid = from_kgid(i_user_ns(&inode->v), attr->ia_gid);
660 if (ia_valid & ATTR_SIZE)
661 bi->bi_size = attr->ia_size;
663 if (ia_valid & ATTR_ATIME)
664 bi->bi_atime = timespec_to_bch2_time(c, attr->ia_atime);
665 if (ia_valid & ATTR_MTIME)
666 bi->bi_mtime = timespec_to_bch2_time(c, attr->ia_mtime);
667 if (ia_valid & ATTR_CTIME)
668 bi->bi_ctime = timespec_to_bch2_time(c, attr->ia_ctime);
670 if (ia_valid & ATTR_MODE) {
671 umode_t mode = attr->ia_mode;
672 kgid_t gid = ia_valid & ATTR_GID
676 if (!in_group_p(gid) &&
677 !capable_wrt_inode_uidgid(idmap, &inode->v, CAP_FSETID))
683 int bch2_setattr_nonsize(struct mnt_idmap *idmap,
684 struct bch_inode_info *inode,
687 struct bch_fs *c = inode->v.i_sb->s_fs_info;
689 struct btree_trans *trans;
690 struct btree_iter inode_iter = { NULL };
691 struct bch_inode_unpacked inode_u;
692 struct posix_acl *acl = NULL;
695 mutex_lock(&inode->ei_update_lock);
699 if (attr->ia_valid & ATTR_UID)
700 qid.q[QTYP_USR] = from_kuid(i_user_ns(&inode->v), attr->ia_uid);
702 if (attr->ia_valid & ATTR_GID)
703 qid.q[QTYP_GRP] = from_kgid(i_user_ns(&inode->v), attr->ia_gid);
705 ret = bch2_fs_quota_transfer(c, inode, qid, ~0,
706 KEY_TYPE_QUOTA_PREALLOC);
710 trans = bch2_trans_get(c);
712 bch2_trans_begin(trans);
716 ret = bch2_inode_peek(trans, &inode_iter, &inode_u, inode_inum(inode),
721 bch2_setattr_copy(idmap, inode, &inode_u, attr);
723 if (attr->ia_valid & ATTR_MODE) {
724 ret = bch2_acl_chmod(trans, inode_inum(inode), &inode_u,
725 inode_u.bi_mode, &acl);
730 ret = bch2_inode_write(trans, &inode_iter, &inode_u) ?:
731 bch2_trans_commit(trans, NULL, NULL,
732 BCH_TRANS_COMMIT_no_enospc);
734 bch2_trans_iter_exit(trans, &inode_iter);
736 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
741 bch2_inode_update_after_write(trans, inode, &inode_u, attr->ia_valid);
744 set_cached_acl(&inode->v, ACL_TYPE_ACCESS, acl);
746 bch2_trans_put(trans);
748 mutex_unlock(&inode->ei_update_lock);
750 return bch2_err_class(ret);
753 static int bch2_getattr(struct mnt_idmap *idmap,
754 const struct path *path, struct kstat *stat,
755 u32 request_mask, unsigned query_flags)
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;
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_get_atime(&inode->v);
769 stat->mtime = inode_get_mtime(&inode->v);
770 stat->ctime = inode_get_ctime(&inode->v);
771 stat->blksize = block_bytes(c);
772 stat->blocks = inode->v.i_blocks;
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);
779 if (inode->ei_inode.bi_flags & BCH_INODE_immutable)
780 stat->attributes |= STATX_ATTR_IMMUTABLE;
781 stat->attributes_mask |= STATX_ATTR_IMMUTABLE;
783 if (inode->ei_inode.bi_flags & BCH_INODE_append)
784 stat->attributes |= STATX_ATTR_APPEND;
785 stat->attributes_mask |= STATX_ATTR_APPEND;
787 if (inode->ei_inode.bi_flags & BCH_INODE_nodump)
788 stat->attributes |= STATX_ATTR_NODUMP;
789 stat->attributes_mask |= STATX_ATTR_NODUMP;
794 static int bch2_setattr(struct mnt_idmap *idmap,
795 struct dentry *dentry, struct iattr *iattr)
797 struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
798 struct bch_fs *c = inode->v.i_sb->s_fs_info;
801 lockdep_assert_held(&inode->v.i_rwsem);
803 ret = bch2_subvol_is_ro(c, inode->ei_subvol) ?:
804 setattr_prepare(idmap, dentry, iattr);
808 return iattr->ia_valid & ATTR_SIZE
809 ? bchfs_truncate(idmap, inode, iattr)
810 : bch2_setattr_nonsize(idmap, inode, iattr);
813 static int bch2_tmpfile(struct mnt_idmap *idmap,
814 struct inode *vdir, struct file *file, umode_t mode)
816 struct bch_inode_info *inode =
817 __bch2_create(idmap, to_bch_ei(vdir),
818 file->f_path.dentry, mode, 0,
819 (subvol_inum) { 0 }, BCH_CREATE_TMPFILE);
822 return bch2_err_class(PTR_ERR(inode));
824 d_mark_tmpfile(file, &inode->v);
825 d_instantiate(file->f_path.dentry, &inode->v);
826 return finish_open_simple(file, 0);
829 static int bch2_fill_extent(struct bch_fs *c,
830 struct fiemap_extent_info *info,
831 struct bkey_s_c k, unsigned flags)
833 if (bkey_extent_is_direct_data(k.k)) {
834 struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
835 const union bch_extent_entry *entry;
836 struct extent_ptr_decoded p;
839 if (k.k->type == KEY_TYPE_reflink_v)
840 flags |= FIEMAP_EXTENT_SHARED;
842 bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
844 u64 offset = p.ptr.offset;
847 flags2 |= FIEMAP_EXTENT_UNWRITTEN;
849 if (p.crc.compression_type)
850 flags2 |= FIEMAP_EXTENT_ENCODED;
852 offset += p.crc.offset;
854 if ((offset & (block_sectors(c) - 1)) ||
855 (k.k->size & (block_sectors(c) - 1)))
856 flags2 |= FIEMAP_EXTENT_NOT_ALIGNED;
858 ret = fiemap_fill_next_extent(info,
859 bkey_start_offset(k.k) << 9,
861 k.k->size << 9, flags|flags2);
867 } else if (bkey_extent_is_inline_data(k.k)) {
868 return fiemap_fill_next_extent(info,
869 bkey_start_offset(k.k) << 9,
872 FIEMAP_EXTENT_DATA_INLINE);
873 } else if (k.k->type == KEY_TYPE_reservation) {
874 return fiemap_fill_next_extent(info,
875 bkey_start_offset(k.k) << 9,
878 FIEMAP_EXTENT_DELALLOC|
879 FIEMAP_EXTENT_UNWRITTEN);
885 static int bch2_fiemap(struct inode *vinode, struct fiemap_extent_info *info,
888 struct bch_fs *c = vinode->i_sb->s_fs_info;
889 struct bch_inode_info *ei = to_bch_ei(vinode);
890 struct btree_trans *trans;
891 struct btree_iter iter;
893 struct bkey_buf cur, prev;
894 struct bpos end = POS(ei->v.i_ino, (start + len) >> 9);
895 unsigned offset_into_extent, sectors;
896 bool have_extent = false;
900 ret = fiemap_prep(&ei->v, info, start, &len, FIEMAP_FLAG_SYNC);
904 if (start + len < start)
909 bch2_bkey_buf_init(&cur);
910 bch2_bkey_buf_init(&prev);
911 trans = bch2_trans_get(c);
913 bch2_trans_begin(trans);
915 ret = bch2_subvolume_get_snapshot(trans, ei->ei_subvol, &snapshot);
919 bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
920 SPOS(ei->v.i_ino, start, snapshot), 0);
922 while (!(ret = btree_trans_too_many_iters(trans)) &&
923 (k = bch2_btree_iter_peek_upto(&iter, end)).k &&
924 !(ret = bkey_err(k))) {
925 enum btree_id data_btree = BTREE_ID_extents;
927 if (!bkey_extent_is_data(k.k) &&
928 k.k->type != KEY_TYPE_reservation) {
929 bch2_btree_iter_advance(&iter);
933 offset_into_extent = iter.pos.offset -
934 bkey_start_offset(k.k);
935 sectors = k.k->size - offset_into_extent;
937 bch2_bkey_buf_reassemble(&cur, c, k);
939 ret = bch2_read_indirect_extent(trans, &data_btree,
940 &offset_into_extent, &cur);
944 k = bkey_i_to_s_c(cur.k);
945 bch2_bkey_buf_realloc(&prev, c, k.k->u64s);
947 sectors = min(sectors, k.k->size - offset_into_extent);
949 bch2_cut_front(POS(k.k->p.inode,
950 bkey_start_offset(k.k) +
953 bch2_key_resize(&cur.k->k, sectors);
954 cur.k->k.p = iter.pos;
955 cur.k->k.p.offset += cur.k->k.size;
958 bch2_trans_unlock(trans);
959 ret = bch2_fill_extent(c, info,
960 bkey_i_to_s_c(prev.k), 0);
965 bkey_copy(prev.k, cur.k);
968 bch2_btree_iter_set_pos(&iter,
969 POS(iter.pos.inode, iter.pos.offset + sectors));
971 start = iter.pos.offset;
972 bch2_trans_iter_exit(trans, &iter);
974 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
977 if (!ret && have_extent) {
978 bch2_trans_unlock(trans);
979 ret = bch2_fill_extent(c, info, bkey_i_to_s_c(prev.k),
983 bch2_trans_put(trans);
984 bch2_bkey_buf_exit(&cur, c);
985 bch2_bkey_buf_exit(&prev, c);
986 return ret < 0 ? ret : 0;
989 static const struct vm_operations_struct bch_vm_ops = {
990 .fault = bch2_page_fault,
991 .map_pages = filemap_map_pages,
992 .page_mkwrite = bch2_page_mkwrite,
995 static int bch2_mmap(struct file *file, struct vm_area_struct *vma)
999 vma->vm_ops = &bch_vm_ops;
1005 static loff_t bch2_dir_llseek(struct file *file, loff_t offset, int whence)
1007 return generic_file_llseek_size(file, offset, whence,
1011 static int bch2_vfs_readdir(struct file *file, struct dir_context *ctx)
1013 struct bch_inode_info *inode = file_bch_inode(file);
1014 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1016 if (!dir_emit_dots(file, ctx))
1019 int ret = bch2_readdir(c, inode_inum(inode), ctx);
1022 return bch2_err_class(ret);
1025 static int bch2_open(struct inode *vinode, struct file *file)
1027 if (file->f_flags & (O_WRONLY|O_RDWR)) {
1028 struct bch_inode_info *inode = to_bch_ei(vinode);
1029 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1031 int ret = bch2_subvol_is_ro(c, inode->ei_subvol);
1036 return generic_file_open(vinode, file);
1039 static const struct file_operations bch_file_operations = {
1041 .llseek = bch2_llseek,
1042 .read_iter = bch2_read_iter,
1043 .write_iter = bch2_write_iter,
1045 .fsync = bch2_fsync,
1046 .splice_read = filemap_splice_read,
1047 .splice_write = iter_file_splice_write,
1048 .fallocate = bch2_fallocate_dispatch,
1049 .unlocked_ioctl = bch2_fs_file_ioctl,
1050 #ifdef CONFIG_COMPAT
1051 .compat_ioctl = bch2_compat_fs_ioctl,
1053 .remap_file_range = bch2_remap_file_range,
1056 static const struct inode_operations bch_file_inode_operations = {
1057 .getattr = bch2_getattr,
1058 .setattr = bch2_setattr,
1059 .fiemap = bch2_fiemap,
1060 .listxattr = bch2_xattr_list,
1061 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1062 .get_acl = bch2_get_acl,
1063 .set_acl = bch2_set_acl,
1067 static const struct inode_operations bch_dir_inode_operations = {
1068 .lookup = bch2_lookup,
1069 .create = bch2_create,
1071 .unlink = bch2_unlink,
1072 .symlink = bch2_symlink,
1073 .mkdir = bch2_mkdir,
1074 .rmdir = bch2_unlink,
1075 .mknod = bch2_mknod,
1076 .rename = bch2_rename2,
1077 .getattr = bch2_getattr,
1078 .setattr = bch2_setattr,
1079 .tmpfile = bch2_tmpfile,
1080 .listxattr = bch2_xattr_list,
1081 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1082 .get_acl = bch2_get_acl,
1083 .set_acl = bch2_set_acl,
1087 static const struct file_operations bch_dir_file_operations = {
1088 .llseek = bch2_dir_llseek,
1089 .read = generic_read_dir,
1090 .iterate_shared = bch2_vfs_readdir,
1091 .fsync = bch2_fsync,
1092 .unlocked_ioctl = bch2_fs_file_ioctl,
1093 #ifdef CONFIG_COMPAT
1094 .compat_ioctl = bch2_compat_fs_ioctl,
1098 static const struct inode_operations bch_symlink_inode_operations = {
1099 .get_link = page_get_link,
1100 .getattr = bch2_getattr,
1101 .setattr = bch2_setattr,
1102 .listxattr = bch2_xattr_list,
1103 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1104 .get_acl = bch2_get_acl,
1105 .set_acl = bch2_set_acl,
1109 static const struct inode_operations bch_special_inode_operations = {
1110 .getattr = bch2_getattr,
1111 .setattr = bch2_setattr,
1112 .listxattr = bch2_xattr_list,
1113 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1114 .get_acl = bch2_get_acl,
1115 .set_acl = bch2_set_acl,
1119 static const struct address_space_operations bch_address_space_operations = {
1120 .read_folio = bch2_read_folio,
1121 .writepages = bch2_writepages,
1122 .readahead = bch2_readahead,
1123 .dirty_folio = filemap_dirty_folio,
1124 .write_begin = bch2_write_begin,
1125 .write_end = bch2_write_end,
1126 .invalidate_folio = bch2_invalidate_folio,
1127 .release_folio = bch2_release_folio,
1128 .direct_IO = noop_direct_IO,
1129 #ifdef CONFIG_MIGRATION
1130 .migrate_folio = filemap_migrate_folio,
1132 .error_remove_folio = generic_error_remove_folio,
1135 struct bcachefs_fid {
1141 struct bcachefs_fid_with_parent {
1142 struct bcachefs_fid fid;
1143 struct bcachefs_fid dir;
1146 static int bcachefs_fid_valid(int fh_len, int fh_type)
1149 case FILEID_BCACHEFS_WITHOUT_PARENT:
1150 return fh_len == sizeof(struct bcachefs_fid) / sizeof(u32);
1151 case FILEID_BCACHEFS_WITH_PARENT:
1152 return fh_len == sizeof(struct bcachefs_fid_with_parent) / sizeof(u32);
1158 static struct bcachefs_fid bch2_inode_to_fid(struct bch_inode_info *inode)
1160 return (struct bcachefs_fid) {
1161 .inum = inode->ei_inode.bi_inum,
1162 .subvol = inode->ei_subvol,
1163 .gen = inode->ei_inode.bi_generation,
1167 static int bch2_encode_fh(struct inode *vinode, u32 *fh, int *len,
1170 struct bch_inode_info *inode = to_bch_ei(vinode);
1171 struct bch_inode_info *dir = to_bch_ei(vdir);
1174 if (!S_ISDIR(inode->v.i_mode) && dir) {
1175 struct bcachefs_fid_with_parent *fid = (void *) fh;
1177 min_len = sizeof(*fid) / sizeof(u32);
1178 if (*len < min_len) {
1180 return FILEID_INVALID;
1183 fid->fid = bch2_inode_to_fid(inode);
1184 fid->dir = bch2_inode_to_fid(dir);
1187 return FILEID_BCACHEFS_WITH_PARENT;
1189 struct bcachefs_fid *fid = (void *) fh;
1191 min_len = sizeof(*fid) / sizeof(u32);
1192 if (*len < min_len) {
1194 return FILEID_INVALID;
1196 *fid = bch2_inode_to_fid(inode);
1199 return FILEID_BCACHEFS_WITHOUT_PARENT;
1203 static struct inode *bch2_nfs_get_inode(struct super_block *sb,
1204 struct bcachefs_fid fid)
1206 struct bch_fs *c = sb->s_fs_info;
1207 struct inode *vinode = bch2_vfs_inode_get(c, (subvol_inum) {
1208 .subvol = fid.subvol,
1211 if (!IS_ERR(vinode) && vinode->i_generation != fid.gen) {
1213 vinode = ERR_PTR(-ESTALE);
1218 static struct dentry *bch2_fh_to_dentry(struct super_block *sb, struct fid *_fid,
1219 int fh_len, int fh_type)
1221 struct bcachefs_fid *fid = (void *) _fid;
1223 if (!bcachefs_fid_valid(fh_len, fh_type))
1226 return d_obtain_alias(bch2_nfs_get_inode(sb, *fid));
1229 static struct dentry *bch2_fh_to_parent(struct super_block *sb, struct fid *_fid,
1230 int fh_len, int fh_type)
1232 struct bcachefs_fid_with_parent *fid = (void *) _fid;
1234 if (!bcachefs_fid_valid(fh_len, fh_type) ||
1235 fh_type != FILEID_BCACHEFS_WITH_PARENT)
1238 return d_obtain_alias(bch2_nfs_get_inode(sb, fid->dir));
1241 static struct dentry *bch2_get_parent(struct dentry *child)
1243 struct bch_inode_info *inode = to_bch_ei(child->d_inode);
1244 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1245 subvol_inum parent_inum = {
1246 .subvol = inode->ei_inode.bi_parent_subvol ?:
1248 .inum = inode->ei_inode.bi_dir,
1251 return d_obtain_alias(bch2_vfs_inode_get(c, parent_inum));
1254 static int bch2_get_name(struct dentry *parent, char *name, struct dentry *child)
1256 struct bch_inode_info *inode = to_bch_ei(child->d_inode);
1257 struct bch_inode_info *dir = to_bch_ei(parent->d_inode);
1258 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1259 struct btree_trans *trans;
1260 struct btree_iter iter1;
1261 struct btree_iter iter2;
1263 struct bkey_s_c_dirent d;
1264 struct bch_inode_unpacked inode_u;
1267 struct qstr dirent_name;
1268 unsigned name_len = 0;
1271 if (!S_ISDIR(dir->v.i_mode))
1274 trans = bch2_trans_get(c);
1276 bch2_trans_iter_init(trans, &iter1, BTREE_ID_dirents,
1277 POS(dir->ei_inode.bi_inum, 0), 0);
1278 bch2_trans_iter_init(trans, &iter2, BTREE_ID_dirents,
1279 POS(dir->ei_inode.bi_inum, 0), 0);
1281 bch2_trans_begin(trans);
1283 ret = bch2_subvolume_get_snapshot(trans, dir->ei_subvol, &snapshot);
1287 bch2_btree_iter_set_snapshot(&iter1, snapshot);
1288 bch2_btree_iter_set_snapshot(&iter2, snapshot);
1290 ret = bch2_inode_find_by_inum_trans(trans, inode_inum(inode), &inode_u);
1294 if (inode_u.bi_dir == dir->ei_inode.bi_inum) {
1295 bch2_btree_iter_set_pos(&iter1, POS(inode_u.bi_dir, inode_u.bi_dir_offset));
1297 k = bch2_btree_iter_peek_slot(&iter1);
1302 if (k.k->type != KEY_TYPE_dirent) {
1303 ret = -BCH_ERR_ENOENT_dirent_doesnt_match_inode;
1307 d = bkey_s_c_to_dirent(k);
1308 ret = bch2_dirent_read_target(trans, inode_inum(dir), d, &target);
1310 ret = -BCH_ERR_ENOENT_dirent_doesnt_match_inode;
1314 if (target.subvol == inode->ei_subvol &&
1315 target.inum == inode->ei_inode.bi_inum)
1319 * File with multiple hardlinks and our backref is to the wrong
1320 * directory - linear search:
1322 for_each_btree_key_continue_norestart(iter2, 0, k, ret) {
1323 if (k.k->p.inode > dir->ei_inode.bi_inum)
1326 if (k.k->type != KEY_TYPE_dirent)
1329 d = bkey_s_c_to_dirent(k);
1330 ret = bch2_dirent_read_target(trans, inode_inum(dir), d, &target);
1336 if (target.subvol == inode->ei_subvol &&
1337 target.inum == inode->ei_inode.bi_inum)
1345 dirent_name = bch2_dirent_get_name(d);
1347 name_len = min_t(unsigned, dirent_name.len, NAME_MAX);
1348 memcpy(name, dirent_name.name, name_len);
1349 name[name_len] = '\0';
1351 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
1354 bch2_trans_iter_exit(trans, &iter1);
1355 bch2_trans_iter_exit(trans, &iter2);
1356 bch2_trans_put(trans);
1361 static const struct export_operations bch_export_ops = {
1362 .encode_fh = bch2_encode_fh,
1363 .fh_to_dentry = bch2_fh_to_dentry,
1364 .fh_to_parent = bch2_fh_to_parent,
1365 .get_parent = bch2_get_parent,
1366 .get_name = bch2_get_name,
1369 static void bch2_vfs_inode_init(struct btree_trans *trans, subvol_inum inum,
1370 struct bch_inode_info *inode,
1371 struct bch_inode_unpacked *bi,
1372 struct bch_subvolume *subvol)
1374 bch2_inode_update_after_write(trans, inode, bi, ~0);
1376 if (BCH_SUBVOLUME_SNAP(subvol))
1377 set_bit(EI_INODE_SNAPSHOT, &inode->ei_flags);
1379 clear_bit(EI_INODE_SNAPSHOT, &inode->ei_flags);
1381 inode->v.i_blocks = bi->bi_sectors;
1382 inode->v.i_ino = bi->bi_inum;
1383 inode->v.i_rdev = bi->bi_dev;
1384 inode->v.i_generation = bi->bi_generation;
1385 inode->v.i_size = bi->bi_size;
1387 inode->ei_flags = 0;
1388 inode->ei_quota_reserved = 0;
1389 inode->ei_qid = bch_qid(bi);
1390 inode->ei_subvol = inum.subvol;
1392 inode->v.i_mapping->a_ops = &bch_address_space_operations;
1394 switch (inode->v.i_mode & S_IFMT) {
1396 inode->v.i_op = &bch_file_inode_operations;
1397 inode->v.i_fop = &bch_file_operations;
1400 inode->v.i_op = &bch_dir_inode_operations;
1401 inode->v.i_fop = &bch_dir_file_operations;
1404 inode_nohighmem(&inode->v);
1405 inode->v.i_op = &bch_symlink_inode_operations;
1408 init_special_inode(&inode->v, inode->v.i_mode, inode->v.i_rdev);
1409 inode->v.i_op = &bch_special_inode_operations;
1413 mapping_set_large_folios(inode->v.i_mapping);
1416 static struct inode *bch2_alloc_inode(struct super_block *sb)
1418 struct bch_inode_info *inode;
1420 inode = kmem_cache_alloc(bch2_inode_cache, GFP_NOFS);
1424 inode_init_once(&inode->v);
1425 mutex_init(&inode->ei_update_lock);
1426 two_state_lock_init(&inode->ei_pagecache_lock);
1427 INIT_LIST_HEAD(&inode->ei_vfs_inode_list);
1428 mutex_init(&inode->ei_quota_lock);
1433 static void bch2_i_callback(struct rcu_head *head)
1435 struct inode *vinode = container_of(head, struct inode, i_rcu);
1436 struct bch_inode_info *inode = to_bch_ei(vinode);
1438 kmem_cache_free(bch2_inode_cache, inode);
1441 static void bch2_destroy_inode(struct inode *vinode)
1443 call_rcu(&vinode->i_rcu, bch2_i_callback);
1446 static int inode_update_times_fn(struct btree_trans *trans,
1447 struct bch_inode_info *inode,
1448 struct bch_inode_unpacked *bi,
1451 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1453 bi->bi_atime = timespec_to_bch2_time(c, inode_get_atime(&inode->v));
1454 bi->bi_mtime = timespec_to_bch2_time(c, inode_get_mtime(&inode->v));
1455 bi->bi_ctime = timespec_to_bch2_time(c, inode_get_ctime(&inode->v));
1460 static int bch2_vfs_write_inode(struct inode *vinode,
1461 struct writeback_control *wbc)
1463 struct bch_fs *c = vinode->i_sb->s_fs_info;
1464 struct bch_inode_info *inode = to_bch_ei(vinode);
1467 mutex_lock(&inode->ei_update_lock);
1468 ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
1469 ATTR_ATIME|ATTR_MTIME|ATTR_CTIME);
1470 mutex_unlock(&inode->ei_update_lock);
1472 return bch2_err_class(ret);
1475 static void bch2_evict_inode(struct inode *vinode)
1477 struct bch_fs *c = vinode->i_sb->s_fs_info;
1478 struct bch_inode_info *inode = to_bch_ei(vinode);
1480 truncate_inode_pages_final(&inode->v.i_data);
1482 clear_inode(&inode->v);
1484 BUG_ON(!is_bad_inode(&inode->v) && inode->ei_quota_reserved);
1486 if (!inode->v.i_nlink && !is_bad_inode(&inode->v)) {
1487 bch2_quota_acct(c, inode->ei_qid, Q_SPC, -((s64) inode->v.i_blocks),
1488 KEY_TYPE_QUOTA_WARN);
1489 bch2_quota_acct(c, inode->ei_qid, Q_INO, -1,
1490 KEY_TYPE_QUOTA_WARN);
1491 bch2_inode_rm(c, inode_inum(inode));
1494 mutex_lock(&c->vfs_inodes_lock);
1495 list_del_init(&inode->ei_vfs_inode_list);
1496 mutex_unlock(&c->vfs_inodes_lock);
1499 void bch2_evict_subvolume_inodes(struct bch_fs *c, snapshot_id_list *s)
1501 struct bch_inode_info *inode;
1502 DARRAY(struct bch_inode_info *) grabbed;
1503 bool clean_pass = false, this_pass_clean;
1506 * Initially, we scan for inodes without I_DONTCACHE, then mark them to
1507 * be pruned with d_mark_dontcache().
1509 * Once we've had a clean pass where we didn't find any inodes without
1510 * I_DONTCACHE, we wait for them to be freed:
1513 darray_init(&grabbed);
1514 darray_make_room(&grabbed, 1024);
1517 this_pass_clean = true;
1519 mutex_lock(&c->vfs_inodes_lock);
1520 list_for_each_entry(inode, &c->vfs_inodes_list, ei_vfs_inode_list) {
1521 if (!snapshot_list_has_id(s, inode->ei_subvol))
1524 if (!(inode->v.i_state & I_DONTCACHE) &&
1525 !(inode->v.i_state & I_FREEING) &&
1527 this_pass_clean = false;
1529 if (darray_push_gfp(&grabbed, inode, GFP_ATOMIC|__GFP_NOWARN)) {
1533 } else if (clean_pass && this_pass_clean) {
1534 wait_queue_head_t *wq = bit_waitqueue(&inode->v.i_state, __I_NEW);
1535 DEFINE_WAIT_BIT(wait, &inode->v.i_state, __I_NEW);
1537 prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
1538 mutex_unlock(&c->vfs_inodes_lock);
1541 finish_wait(wq, &wait.wq_entry);
1545 mutex_unlock(&c->vfs_inodes_lock);
1547 darray_for_each(grabbed, i) {
1549 d_mark_dontcache(&inode->v);
1550 d_prune_aliases(&inode->v);
1555 if (!clean_pass || !this_pass_clean) {
1556 clean_pass = this_pass_clean;
1560 darray_exit(&grabbed);
1563 static int bch2_statfs(struct dentry *dentry, struct kstatfs *buf)
1565 struct super_block *sb = dentry->d_sb;
1566 struct bch_fs *c = sb->s_fs_info;
1567 struct bch_fs_usage_short usage = bch2_fs_usage_read_short(c);
1568 unsigned shift = sb->s_blocksize_bits - 9;
1570 * this assumes inodes take up 64 bytes, which is a decent average
1573 u64 avail_inodes = ((usage.capacity - usage.used) << 3);
1576 buf->f_type = BCACHEFS_STATFS_MAGIC;
1577 buf->f_bsize = sb->s_blocksize;
1578 buf->f_blocks = usage.capacity >> shift;
1579 buf->f_bfree = usage.free >> shift;
1580 buf->f_bavail = avail_factor(usage.free) >> shift;
1582 buf->f_files = usage.nr_inodes + avail_inodes;
1583 buf->f_ffree = avail_inodes;
1585 fsid = le64_to_cpup((void *) c->sb.user_uuid.b) ^
1586 le64_to_cpup((void *) c->sb.user_uuid.b + sizeof(u64));
1587 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1588 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1589 buf->f_namelen = BCH_NAME_MAX;
1594 static int bch2_sync_fs(struct super_block *sb, int wait)
1596 struct bch_fs *c = sb->s_fs_info;
1599 if (c->opts.journal_flush_disabled)
1603 bch2_journal_flush_async(&c->journal, NULL);
1607 ret = bch2_journal_flush(&c->journal);
1608 return bch2_err_class(ret);
1611 static struct bch_fs *bch2_path_to_fs(const char *path)
1617 ret = lookup_bdev(path, &dev);
1619 return ERR_PTR(ret);
1621 c = bch2_dev_to_fs(dev);
1623 closure_put(&c->cl);
1624 return c ?: ERR_PTR(-ENOENT);
1627 static int bch2_remount(struct super_block *sb, int *flags, char *data)
1629 struct bch_fs *c = sb->s_fs_info;
1630 struct bch_opts opts = bch2_opts_empty();
1633 ret = bch2_parse_mount_opts(c, &opts, data);
1637 opt_set(opts, read_only, (*flags & SB_RDONLY) != 0);
1639 if (opts.read_only != c->opts.read_only) {
1640 down_write(&c->state_lock);
1642 if (opts.read_only) {
1643 bch2_fs_read_only(c);
1645 sb->s_flags |= SB_RDONLY;
1647 ret = bch2_fs_read_write(c);
1649 bch_err(c, "error going rw: %i", ret);
1650 up_write(&c->state_lock);
1655 sb->s_flags &= ~SB_RDONLY;
1658 c->opts.read_only = opts.read_only;
1660 up_write(&c->state_lock);
1663 if (opt_defined(opts, errors))
1664 c->opts.errors = opts.errors;
1666 return bch2_err_class(ret);
1669 static int bch2_show_devname(struct seq_file *seq, struct dentry *root)
1671 struct bch_fs *c = root->d_sb->s_fs_info;
1674 for_each_online_member(c, ca) {
1678 seq_puts(seq, ca->disk_sb.sb_name);
1684 static int bch2_show_options(struct seq_file *seq, struct dentry *root)
1686 struct bch_fs *c = root->d_sb->s_fs_info;
1688 struct printbuf buf = PRINTBUF;
1691 for (i = 0; i < bch2_opts_nr; i++) {
1692 const struct bch_option *opt = &bch2_opt_table[i];
1693 u64 v = bch2_opt_get_by_id(&c->opts, i);
1695 if (!(opt->flags & OPT_MOUNT))
1698 if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
1701 printbuf_reset(&buf);
1702 bch2_opt_to_text(&buf, c, c->disk_sb.sb, opt, v,
1703 OPT_SHOW_MOUNT_STYLE);
1705 seq_puts(seq, buf.buf);
1708 if (buf.allocation_failure)
1710 printbuf_exit(&buf);
1714 static void bch2_put_super(struct super_block *sb)
1716 struct bch_fs *c = sb->s_fs_info;
1722 * bcachefs doesn't currently integrate intwrite freeze protection but the
1723 * internal write references serve the same purpose. Therefore reuse the
1724 * read-only transition code to perform the quiesce. The caveat is that we don't
1725 * currently have the ability to block tasks that want a write reference while
1726 * the superblock is frozen. This is fine for now, but we should either add
1727 * blocking support or find a way to integrate sb_start_intwrite() and friends.
1729 static int bch2_freeze(struct super_block *sb)
1731 struct bch_fs *c = sb->s_fs_info;
1733 down_write(&c->state_lock);
1734 bch2_fs_read_only(c);
1735 up_write(&c->state_lock);
1739 static int bch2_unfreeze(struct super_block *sb)
1741 struct bch_fs *c = sb->s_fs_info;
1744 if (test_bit(BCH_FS_emergency_ro, &c->flags))
1747 down_write(&c->state_lock);
1748 ret = bch2_fs_read_write(c);
1749 up_write(&c->state_lock);
1753 static const struct super_operations bch_super_operations = {
1754 .alloc_inode = bch2_alloc_inode,
1755 .destroy_inode = bch2_destroy_inode,
1756 .write_inode = bch2_vfs_write_inode,
1757 .evict_inode = bch2_evict_inode,
1758 .sync_fs = bch2_sync_fs,
1759 .statfs = bch2_statfs,
1760 .show_devname = bch2_show_devname,
1761 .show_options = bch2_show_options,
1762 .remount_fs = bch2_remount,
1763 .put_super = bch2_put_super,
1764 .freeze_fs = bch2_freeze,
1765 .unfreeze_fs = bch2_unfreeze,
1768 static int bch2_set_super(struct super_block *s, void *data)
1770 s->s_fs_info = data;
1774 static int bch2_noset_super(struct super_block *s, void *data)
1779 typedef DARRAY(struct bch_fs *) darray_fs;
1781 static int bch2_test_super(struct super_block *s, void *data)
1783 struct bch_fs *c = s->s_fs_info;
1784 darray_fs *d = data;
1789 darray_for_each(*d, i)
1795 static struct dentry *bch2_mount(struct file_system_type *fs_type,
1796 int flags, const char *dev_name, void *data)
1799 struct super_block *sb;
1800 struct inode *vinode;
1801 struct bch_opts opts = bch2_opts_empty();
1804 opt_set(opts, read_only, (flags & SB_RDONLY) != 0);
1806 ret = bch2_parse_mount_opts(NULL, &opts, data);
1808 return ERR_PTR(ret);
1810 if (!dev_name || strlen(dev_name) == 0)
1811 return ERR_PTR(-EINVAL);
1814 ret = bch2_split_devs(dev_name, &devs);
1816 return ERR_PTR(ret);
1818 darray_fs devs_to_fs = {};
1819 darray_for_each(devs, i) {
1820 ret = darray_push(&devs_to_fs, bch2_path_to_fs(*i));
1827 sb = sget(fs_type, bch2_test_super, bch2_noset_super, flags|SB_NOSEC, &devs_to_fs);
1831 c = bch2_fs_open(devs.data, devs.nr, opts);
1837 /* Some options can't be parsed until after the fs is started: */
1838 ret = bch2_parse_mount_opts(c, &opts, data);
1845 bch2_opts_apply(&c->opts, opts);
1847 sb = sget(fs_type, NULL, bch2_set_super, flags|SB_NOSEC, c);
1851 darray_exit(&devs_to_fs);
1852 bch2_darray_str_exit(&devs);
1856 ret = bch2_err_class(ret);
1857 return ERR_PTR(ret);
1863 if ((flags ^ sb->s_flags) & SB_RDONLY) {
1870 sb->s_blocksize = block_bytes(c);
1871 sb->s_blocksize_bits = ilog2(block_bytes(c));
1872 sb->s_maxbytes = MAX_LFS_FILESIZE;
1873 sb->s_op = &bch_super_operations;
1874 sb->s_export_op = &bch_export_ops;
1875 #ifdef CONFIG_BCACHEFS_QUOTA
1876 sb->s_qcop = &bch2_quotactl_operations;
1877 sb->s_quota_types = QTYPE_MASK_USR|QTYPE_MASK_GRP|QTYPE_MASK_PRJ;
1879 sb->s_xattr = bch2_xattr_handlers;
1880 sb->s_magic = BCACHEFS_STATFS_MAGIC;
1881 sb->s_time_gran = c->sb.nsec_per_time_unit;
1882 sb->s_time_min = div_s64(S64_MIN, c->sb.time_units_per_sec) + 1;
1883 sb->s_time_max = div_s64(S64_MAX, c->sb.time_units_per_sec);
1885 strscpy(sb->s_id, c->name, sizeof(sb->s_id));
1887 ret = super_setup_bdi(sb);
1891 sb->s_bdi->ra_pages = VM_READAHEAD_PAGES;
1893 for_each_online_member(c, ca) {
1894 struct block_device *bdev = ca->disk_sb.bdev;
1896 /* XXX: create an anonymous device for multi device filesystems */
1898 sb->s_dev = bdev->bd_dev;
1899 percpu_ref_put(&ca->io_ref);
1905 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1907 sb->s_flags |= SB_POSIXACL;
1910 sb->s_shrink->seeks = 0;
1912 vinode = bch2_vfs_inode_get(c, BCACHEFS_ROOT_SUBVOL_INUM);
1913 ret = PTR_ERR_OR_ZERO(vinode);
1914 bch_err_msg(c, ret, "mounting: error getting root inode");
1918 sb->s_root = d_make_root(vinode);
1920 bch_err(c, "error mounting: error allocating root dentry");
1925 sb->s_flags |= SB_ACTIVE;
1927 return dget(sb->s_root);
1930 deactivate_locked_super(sb);
1931 return ERR_PTR(bch2_err_class(ret));
1934 static void bch2_kill_sb(struct super_block *sb)
1936 struct bch_fs *c = sb->s_fs_info;
1938 generic_shutdown_super(sb);
1942 static struct file_system_type bcache_fs_type = {
1943 .owner = THIS_MODULE,
1945 .mount = bch2_mount,
1946 .kill_sb = bch2_kill_sb,
1947 .fs_flags = FS_REQUIRES_DEV,
1950 MODULE_ALIAS_FS("bcachefs");
1952 void bch2_vfs_exit(void)
1954 unregister_filesystem(&bcache_fs_type);
1955 kmem_cache_destroy(bch2_inode_cache);
1958 int __init bch2_vfs_init(void)
1962 bch2_inode_cache = KMEM_CACHE(bch_inode_info, SLAB_RECLAIM_ACCOUNT);
1963 if (!bch2_inode_cache)
1966 ret = register_filesystem(&bcache_fs_type);
1976 #endif /* NO_BCACHEFS_FS */