1 // SPDX-License-Identifier: GPL-2.0
7 #include "btree_update.h"
14 #include "fs-common.h"
26 #include <linux/aio.h>
27 #include <linux/backing-dev.h>
28 #include <linux/exportfs.h>
29 #include <linux/fiemap.h>
30 #include <linux/module.h>
31 #include <linux/pagemap.h>
32 #include <linux/posix_acl.h>
33 #include <linux/random.h>
34 #include <linux/seq_file.h>
35 #include <linux/statfs.h>
36 #include <linux/string.h>
37 #include <linux/xattr.h>
39 static struct kmem_cache *bch2_inode_cache;
41 static void bch2_vfs_inode_init(struct btree_trans *, subvol_inum,
42 struct bch_inode_info *,
43 struct bch_inode_unpacked *,
44 struct bch_subvolume *);
46 void bch2_inode_update_after_write(struct btree_trans *trans,
47 struct bch_inode_info *inode,
48 struct bch_inode_unpacked *bi,
51 struct bch_fs *c = trans->c;
53 BUG_ON(bi->bi_inum != inode->v.i_ino);
55 bch2_assert_pos_locked(trans, BTREE_ID_inodes,
57 c->opts.inodes_use_key_cache);
59 set_nlink(&inode->v, bch2_inode_nlink_get(bi));
60 i_uid_write(&inode->v, bi->bi_uid);
61 i_gid_write(&inode->v, bi->bi_gid);
62 inode->v.i_mode = bi->bi_mode;
64 if (fields & ATTR_ATIME)
65 inode->v.i_atime = bch2_time_to_timespec(c, bi->bi_atime);
66 if (fields & ATTR_MTIME)
67 inode->v.i_mtime = bch2_time_to_timespec(c, bi->bi_mtime);
68 if (fields & ATTR_CTIME)
69 inode->v.i_ctime = bch2_time_to_timespec(c, bi->bi_ctime);
71 inode->ei_inode = *bi;
73 bch2_inode_flags_to_vfs(inode);
76 int __must_check bch2_write_inode(struct bch_fs *c,
77 struct bch_inode_info *inode,
79 void *p, unsigned fields)
81 struct btree_trans trans;
82 struct btree_iter iter = { NULL };
83 struct bch_inode_unpacked inode_u;
86 bch2_trans_init(&trans, c, 0, 512);
88 bch2_trans_begin(&trans);
90 ret = bch2_inode_peek(&trans, &iter, &inode_u, inode_inum(inode),
92 (set ? set(inode, &inode_u, p) : 0) ?:
93 bch2_inode_write(&trans, &iter, &inode_u) ?:
94 bch2_trans_commit(&trans, NULL, NULL, BTREE_INSERT_NOFAIL);
97 * the btree node lock protects inode->ei_inode, not ei_update_lock;
98 * this is important for inode updates via bchfs_write_index_update
101 bch2_inode_update_after_write(&trans, inode, &inode_u, fields);
103 bch2_trans_iter_exit(&trans, &iter);
105 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
108 bch2_fs_fatal_err_on(ret == -ENOENT, c,
109 "inode %u:%llu not found when updating",
110 inode_inum(inode).subvol,
111 inode_inum(inode).inum);
113 bch2_trans_exit(&trans);
114 return ret < 0 ? ret : 0;
117 int bch2_fs_quota_transfer(struct bch_fs *c,
118 struct bch_inode_info *inode,
119 struct bch_qid new_qid,
121 enum quota_acct_mode mode)
126 qtypes &= enabled_qtypes(c);
128 for (i = 0; i < QTYP_NR; i++)
129 if (new_qid.q[i] == inode->ei_qid.q[i])
130 qtypes &= ~(1U << i);
135 mutex_lock(&inode->ei_quota_lock);
137 ret = bch2_quota_transfer(c, qtypes, new_qid,
140 inode->ei_quota_reserved,
143 for (i = 0; i < QTYP_NR; i++)
144 if (qtypes & (1 << i))
145 inode->ei_qid.q[i] = new_qid.q[i];
147 mutex_unlock(&inode->ei_quota_lock);
152 static int bch2_iget5_test(struct inode *vinode, void *p)
154 struct bch_inode_info *inode = to_bch_ei(vinode);
155 subvol_inum *inum = p;
157 return inode->ei_subvol == inum->subvol &&
158 inode->ei_inode.bi_inum == inum->inum;
161 static int bch2_iget5_set(struct inode *vinode, void *p)
163 struct bch_inode_info *inode = to_bch_ei(vinode);
164 subvol_inum *inum = p;
166 inode->v.i_ino = inum->inum;
167 inode->ei_subvol = inum->subvol;
168 inode->ei_inode.bi_inum = inum->inum;
172 static unsigned bch2_inode_hash(subvol_inum inum)
174 return jhash_3words(inum.subvol, inum.inum >> 32, inum.inum, JHASH_INITVAL);
177 struct inode *bch2_vfs_inode_get(struct bch_fs *c, subvol_inum inum)
179 struct bch_inode_unpacked inode_u;
180 struct bch_inode_info *inode;
181 struct btree_trans trans;
182 struct bch_subvolume subvol;
185 inode = to_bch_ei(iget5_locked(c->vfs_sb,
186 bch2_inode_hash(inum),
190 if (unlikely(!inode))
191 return ERR_PTR(-ENOMEM);
192 if (!(inode->v.i_state & I_NEW))
195 bch2_trans_init(&trans, c, 8, 0);
196 ret = lockrestart_do(&trans,
197 bch2_subvolume_get(&trans, inum.subvol, true, 0, &subvol) ?:
198 bch2_inode_find_by_inum_trans(&trans, inum, &inode_u));
201 bch2_vfs_inode_init(&trans, inum, inode, &inode_u, &subvol);
202 bch2_trans_exit(&trans);
205 iget_failed(&inode->v);
209 mutex_lock(&c->vfs_inodes_lock);
210 list_add(&inode->ei_vfs_inode_list, &c->vfs_inodes_list);
211 mutex_unlock(&c->vfs_inodes_lock);
213 unlock_new_inode(&inode->v);
218 struct bch_inode_info *
219 __bch2_create(struct mnt_idmap *idmap,
220 struct bch_inode_info *dir, struct dentry *dentry,
221 umode_t mode, dev_t rdev, subvol_inum snapshot_src,
224 struct bch_fs *c = dir->v.i_sb->s_fs_info;
225 struct btree_trans trans;
226 struct bch_inode_unpacked dir_u;
227 struct bch_inode_info *inode, *old;
228 struct bch_inode_unpacked inode_u;
229 struct posix_acl *default_acl = NULL, *acl = NULL;
231 struct bch_subvolume subvol;
236 * preallocate acls + vfs inode before btree transaction, so that
237 * nothing can fail after the transaction succeeds:
239 #ifdef CONFIG_BCACHEFS_POSIX_ACL
240 ret = posix_acl_create(&dir->v, &mode, &default_acl, &acl);
244 inode = to_bch_ei(new_inode(c->vfs_sb));
245 if (unlikely(!inode)) {
246 inode = ERR_PTR(-ENOMEM);
250 bch2_inode_init_early(c, &inode_u);
252 if (!(flags & BCH_CREATE_TMPFILE))
253 mutex_lock(&dir->ei_update_lock);
255 bch2_trans_init(&trans, c, 8,
256 2048 + (!(flags & BCH_CREATE_TMPFILE)
257 ? dentry->d_name.len : 0));
259 bch2_trans_begin(&trans);
261 ret = bch2_create_trans(&trans,
262 inode_inum(dir), &dir_u, &inode_u,
263 !(flags & BCH_CREATE_TMPFILE)
264 ? &dentry->d_name : NULL,
265 from_kuid(i_user_ns(&dir->v), current_fsuid()),
266 from_kgid(i_user_ns(&dir->v), current_fsgid()),
268 default_acl, acl, snapshot_src, flags) ?:
269 bch2_quota_acct(c, bch_qid(&inode_u), Q_INO, 1,
270 KEY_TYPE_QUOTA_PREALLOC);
272 goto err_before_quota;
274 inum.subvol = inode_u.bi_subvol ?: dir->ei_subvol;
275 inum.inum = inode_u.bi_inum;
277 ret = bch2_subvolume_get(&trans, inum.subvol, true,
278 BTREE_ITER_WITH_UPDATES, &subvol) ?:
279 bch2_trans_commit(&trans, NULL, &journal_seq, 0);
281 bch2_quota_acct(c, bch_qid(&inode_u), Q_INO, -1,
282 KEY_TYPE_QUOTA_WARN);
284 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
289 if (!(flags & BCH_CREATE_TMPFILE)) {
290 bch2_inode_update_after_write(&trans, dir, &dir_u,
291 ATTR_MTIME|ATTR_CTIME);
292 mutex_unlock(&dir->ei_update_lock);
295 bch2_iget5_set(&inode->v, &inum);
296 bch2_vfs_inode_init(&trans, inum, inode, &inode_u, &subvol);
298 set_cached_acl(&inode->v, ACL_TYPE_ACCESS, acl);
299 set_cached_acl(&inode->v, ACL_TYPE_DEFAULT, default_acl);
302 * we must insert the new inode into the inode cache before calling
303 * bch2_trans_exit() and dropping locks, else we could race with another
304 * thread pulling the inode in and modifying it:
307 inode->v.i_state |= I_CREATING;
309 old = to_bch_ei(inode_insert5(&inode->v,
310 bch2_inode_hash(inum),
316 if (unlikely(old != inode)) {
318 * We raced, another process pulled the new inode into cache
321 make_bad_inode(&inode->v);
326 mutex_lock(&c->vfs_inodes_lock);
327 list_add(&inode->ei_vfs_inode_list, &c->vfs_inodes_list);
328 mutex_unlock(&c->vfs_inodes_lock);
330 * we really don't want insert_inode_locked2() to be setting
333 unlock_new_inode(&inode->v);
336 bch2_trans_exit(&trans);
338 posix_acl_release(default_acl);
339 posix_acl_release(acl);
342 if (!(flags & BCH_CREATE_TMPFILE))
343 mutex_unlock(&dir->ei_update_lock);
345 bch2_trans_exit(&trans);
346 make_bad_inode(&inode->v);
348 inode = ERR_PTR(ret);
354 static struct dentry *bch2_lookup(struct inode *vdir, struct dentry *dentry,
357 struct bch_fs *c = vdir->i_sb->s_fs_info;
358 struct bch_inode_info *dir = to_bch_ei(vdir);
359 struct bch_hash_info hash = bch2_hash_info_init(c, &dir->ei_inode);
360 struct inode *vinode = NULL;
361 subvol_inum inum = { .subvol = 1 };
364 ret = bch2_dirent_lookup(c, inode_inum(dir), &hash,
365 &dentry->d_name, &inum);
368 vinode = bch2_vfs_inode_get(c, inum);
370 return d_splice_alias(vinode, dentry);
373 static int bch2_mknod(struct mnt_idmap *idmap,
374 struct inode *vdir, struct dentry *dentry,
375 umode_t mode, dev_t rdev)
377 struct bch_inode_info *inode =
378 __bch2_create(idmap, to_bch_ei(vdir), dentry, mode, rdev,
379 (subvol_inum) { 0 }, 0);
382 return bch2_err_class(PTR_ERR(inode));
384 d_instantiate(dentry, &inode->v);
388 static int bch2_create(struct mnt_idmap *idmap,
389 struct inode *vdir, struct dentry *dentry,
390 umode_t mode, bool excl)
392 return bch2_mknod(idmap, vdir, dentry, mode|S_IFREG, 0);
395 static int __bch2_link(struct bch_fs *c,
396 struct bch_inode_info *inode,
397 struct bch_inode_info *dir,
398 struct dentry *dentry)
400 struct btree_trans trans;
401 struct bch_inode_unpacked dir_u, inode_u;
404 mutex_lock(&inode->ei_update_lock);
405 bch2_trans_init(&trans, c, 4, 1024);
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_exit(&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_link(c, inode, dir, dentry);
439 d_instantiate(dentry, &inode->v);
443 int __bch2_unlink(struct inode *vdir, struct dentry *dentry,
444 bool deleting_snapshot)
446 struct bch_fs *c = vdir->i_sb->s_fs_info;
447 struct bch_inode_info *dir = to_bch_ei(vdir);
448 struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
449 struct bch_inode_unpacked dir_u, inode_u;
450 struct btree_trans trans;
453 bch2_lock_inodes(INODE_UPDATE_LOCK, dir, inode);
454 bch2_trans_init(&trans, c, 4, 1024);
456 ret = commit_do(&trans, NULL, NULL,
458 bch2_unlink_trans(&trans,
459 inode_inum(dir), &dir_u,
460 &inode_u, &dentry->d_name,
465 bch2_inode_update_after_write(&trans, dir, &dir_u,
466 ATTR_MTIME|ATTR_CTIME);
467 bch2_inode_update_after_write(&trans, inode, &inode_u,
470 if (inode_u.bi_subvol) {
472 * Subvolume deletion is asynchronous, but we still want to tell
473 * the VFS that it's been deleted here:
475 set_nlink(&inode->v, 0);
478 bch2_trans_exit(&trans);
479 bch2_unlock_inodes(INODE_UPDATE_LOCK, dir, inode);
484 static int bch2_unlink(struct inode *vdir, struct dentry *dentry)
486 return __bch2_unlink(vdir, dentry, false);
489 static int bch2_symlink(struct mnt_idmap *idmap,
490 struct inode *vdir, struct dentry *dentry,
493 struct bch_fs *c = vdir->i_sb->s_fs_info;
494 struct bch_inode_info *dir = to_bch_ei(vdir), *inode;
497 inode = __bch2_create(idmap, dir, dentry, S_IFLNK|S_IRWXUGO, 0,
498 (subvol_inum) { 0 }, BCH_CREATE_TMPFILE);
500 return bch2_err_class(PTR_ERR(inode));
502 inode_lock(&inode->v);
503 ret = page_symlink(&inode->v, symname, strlen(symname) + 1);
504 inode_unlock(&inode->v);
509 ret = filemap_write_and_wait_range(inode->v.i_mapping, 0, LLONG_MAX);
513 ret = __bch2_link(c, inode, dir, dentry);
517 d_instantiate(dentry, &inode->v);
524 static int bch2_mkdir(struct mnt_idmap *idmap,
525 struct inode *vdir, struct dentry *dentry, umode_t mode)
527 return bch2_mknod(idmap, vdir, dentry, mode|S_IFDIR, 0);
530 static int bch2_rename2(struct mnt_idmap *idmap,
531 struct inode *src_vdir, struct dentry *src_dentry,
532 struct inode *dst_vdir, struct dentry *dst_dentry,
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;
549 if (flags & ~(RENAME_NOREPLACE|RENAME_EXCHANGE))
552 if (mode == BCH_RENAME_OVERWRITE) {
553 ret = filemap_write_and_wait_range(src_inode->v.i_mapping,
559 bch2_trans_init(&trans, c, 8, 2048);
561 bch2_lock_inodes(INODE_UPDATE_LOCK,
567 if (inode_attr_changing(dst_dir, src_inode, Inode_opt_project)) {
568 ret = bch2_fs_quota_transfer(c, src_inode,
571 KEY_TYPE_QUOTA_PREALLOC);
576 if (mode == BCH_RENAME_EXCHANGE &&
577 inode_attr_changing(src_dir, dst_inode, Inode_opt_project)) {
578 ret = bch2_fs_quota_transfer(c, dst_inode,
581 KEY_TYPE_QUOTA_PREALLOC);
586 ret = commit_do(&trans, NULL, NULL, 0,
587 bch2_rename_trans(&trans,
588 inode_inum(src_dir), &src_dir_u,
589 inode_inum(dst_dir), &dst_dir_u,
598 BUG_ON(src_inode->v.i_ino != src_inode_u.bi_inum);
600 dst_inode->v.i_ino != dst_inode_u.bi_inum);
602 bch2_inode_update_after_write(&trans, src_dir, &src_dir_u,
603 ATTR_MTIME|ATTR_CTIME);
605 if (src_dir != dst_dir)
606 bch2_inode_update_after_write(&trans, dst_dir, &dst_dir_u,
607 ATTR_MTIME|ATTR_CTIME);
609 bch2_inode_update_after_write(&trans, src_inode, &src_inode_u,
613 bch2_inode_update_after_write(&trans, dst_inode, &dst_inode_u,
616 bch2_trans_exit(&trans);
618 bch2_fs_quota_transfer(c, src_inode,
619 bch_qid(&src_inode->ei_inode),
621 KEY_TYPE_QUOTA_NOCHECK);
623 bch2_fs_quota_transfer(c, dst_inode,
624 bch_qid(&dst_inode->ei_inode),
626 KEY_TYPE_QUOTA_NOCHECK);
628 bch2_unlock_inodes(INODE_UPDATE_LOCK,
637 static void bch2_setattr_copy(struct mnt_idmap *idmap,
638 struct bch_inode_info *inode,
639 struct bch_inode_unpacked *bi,
642 struct bch_fs *c = inode->v.i_sb->s_fs_info;
643 unsigned int ia_valid = attr->ia_valid;
645 if (ia_valid & ATTR_UID)
646 bi->bi_uid = from_kuid(i_user_ns(&inode->v), attr->ia_uid);
647 if (ia_valid & ATTR_GID)
648 bi->bi_gid = from_kgid(i_user_ns(&inode->v), attr->ia_gid);
650 if (ia_valid & ATTR_SIZE)
651 bi->bi_size = attr->ia_size;
653 if (ia_valid & ATTR_ATIME)
654 bi->bi_atime = timespec_to_bch2_time(c, attr->ia_atime);
655 if (ia_valid & ATTR_MTIME)
656 bi->bi_mtime = timespec_to_bch2_time(c, attr->ia_mtime);
657 if (ia_valid & ATTR_CTIME)
658 bi->bi_ctime = timespec_to_bch2_time(c, attr->ia_ctime);
660 if (ia_valid & ATTR_MODE) {
661 umode_t mode = attr->ia_mode;
662 kgid_t gid = ia_valid & ATTR_GID
666 if (!in_group_p(gid) &&
667 !capable_wrt_inode_uidgid(idmap, &inode->v, CAP_FSETID))
673 int bch2_setattr_nonsize(struct mnt_idmap *idmap,
674 struct bch_inode_info *inode,
677 struct bch_fs *c = inode->v.i_sb->s_fs_info;
679 struct btree_trans trans;
680 struct btree_iter inode_iter = { NULL };
681 struct bch_inode_unpacked inode_u;
682 struct posix_acl *acl = NULL;
685 mutex_lock(&inode->ei_update_lock);
689 if (attr->ia_valid & ATTR_UID)
690 qid.q[QTYP_USR] = from_kuid(i_user_ns(&inode->v), attr->ia_uid);
692 if (attr->ia_valid & ATTR_GID)
693 qid.q[QTYP_GRP] = from_kgid(i_user_ns(&inode->v), attr->ia_gid);
695 ret = bch2_fs_quota_transfer(c, inode, qid, ~0,
696 KEY_TYPE_QUOTA_PREALLOC);
700 bch2_trans_init(&trans, c, 0, 0);
702 bch2_trans_begin(&trans);
706 ret = bch2_inode_peek(&trans, &inode_iter, &inode_u, inode_inum(inode),
711 bch2_setattr_copy(idmap, inode, &inode_u, attr);
713 if (attr->ia_valid & ATTR_MODE) {
714 ret = bch2_acl_chmod(&trans, inode_inum(inode), &inode_u,
715 inode_u.bi_mode, &acl);
720 ret = bch2_inode_write(&trans, &inode_iter, &inode_u) ?:
721 bch2_trans_commit(&trans, NULL, NULL,
722 BTREE_INSERT_NOFAIL);
724 bch2_trans_iter_exit(&trans, &inode_iter);
726 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
731 bch2_inode_update_after_write(&trans, inode, &inode_u, attr->ia_valid);
734 set_cached_acl(&inode->v, ACL_TYPE_ACCESS, acl);
736 bch2_trans_exit(&trans);
738 mutex_unlock(&inode->ei_update_lock);
740 return bch2_err_class(ret);
743 static int bch2_getattr(struct mnt_idmap *idmap,
744 const struct path *path, struct kstat *stat,
745 u32 request_mask, unsigned query_flags)
747 struct bch_inode_info *inode = to_bch_ei(d_inode(path->dentry));
748 struct bch_fs *c = inode->v.i_sb->s_fs_info;
750 stat->dev = inode->v.i_sb->s_dev;
751 stat->ino = inode->v.i_ino;
752 stat->mode = inode->v.i_mode;
753 stat->nlink = inode->v.i_nlink;
754 stat->uid = inode->v.i_uid;
755 stat->gid = inode->v.i_gid;
756 stat->rdev = inode->v.i_rdev;
757 stat->size = i_size_read(&inode->v);
758 stat->atime = inode->v.i_atime;
759 stat->mtime = inode->v.i_mtime;
760 stat->ctime = inode->v.i_ctime;
761 stat->blksize = block_bytes(c);
762 stat->blocks = inode->v.i_blocks;
764 if (request_mask & STATX_BTIME) {
765 stat->result_mask |= STATX_BTIME;
766 stat->btime = bch2_time_to_timespec(c, inode->ei_inode.bi_otime);
769 if (inode->ei_inode.bi_flags & BCH_INODE_IMMUTABLE)
770 stat->attributes |= STATX_ATTR_IMMUTABLE;
771 stat->attributes_mask |= STATX_ATTR_IMMUTABLE;
773 if (inode->ei_inode.bi_flags & BCH_INODE_APPEND)
774 stat->attributes |= STATX_ATTR_APPEND;
775 stat->attributes_mask |= STATX_ATTR_APPEND;
777 if (inode->ei_inode.bi_flags & BCH_INODE_NODUMP)
778 stat->attributes |= STATX_ATTR_NODUMP;
779 stat->attributes_mask |= STATX_ATTR_NODUMP;
784 static int bch2_setattr(struct mnt_idmap *idmap,
785 struct dentry *dentry, struct iattr *iattr)
787 struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
790 lockdep_assert_held(&inode->v.i_rwsem);
792 ret = setattr_prepare(idmap, dentry, iattr);
796 return iattr->ia_valid & ATTR_SIZE
797 ? bch2_truncate(idmap, inode, iattr)
798 : bch2_setattr_nonsize(idmap, inode, iattr);
801 static int bch2_tmpfile(struct mnt_idmap *idmap,
802 struct inode *vdir, struct file *file, umode_t mode)
804 struct bch_inode_info *inode =
805 __bch2_create(idmap, to_bch_ei(vdir),
806 file->f_path.dentry, mode, 0,
807 (subvol_inum) { 0 }, BCH_CREATE_TMPFILE);
810 return bch2_err_class(PTR_ERR(inode));
812 d_mark_tmpfile(file, &inode->v);
813 d_instantiate(file->f_path.dentry, &inode->v);
814 return finish_open_simple(file, 0);
817 static int bch2_fill_extent(struct bch_fs *c,
818 struct fiemap_extent_info *info,
819 struct bkey_s_c k, unsigned flags)
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;
827 if (k.k->type == KEY_TYPE_reflink_v)
828 flags |= FIEMAP_EXTENT_SHARED;
830 bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
832 u64 offset = p.ptr.offset;
835 flags2 |= FIEMAP_EXTENT_UNWRITTEN;
837 if (p.crc.compression_type)
838 flags2 |= FIEMAP_EXTENT_ENCODED;
840 offset += p.crc.offset;
842 if ((offset & (block_sectors(c) - 1)) ||
843 (k.k->size & (block_sectors(c) - 1)))
844 flags2 |= FIEMAP_EXTENT_NOT_ALIGNED;
846 ret = fiemap_fill_next_extent(info,
847 bkey_start_offset(k.k) << 9,
849 k.k->size << 9, flags|flags2);
855 } else if (bkey_extent_is_inline_data(k.k)) {
856 return fiemap_fill_next_extent(info,
857 bkey_start_offset(k.k) << 9,
860 FIEMAP_EXTENT_DATA_INLINE);
861 } else if (k.k->type == KEY_TYPE_reservation) {
862 return fiemap_fill_next_extent(info,
863 bkey_start_offset(k.k) << 9,
866 FIEMAP_EXTENT_DELALLOC|
867 FIEMAP_EXTENT_UNWRITTEN);
873 static int bch2_fiemap(struct inode *vinode, struct fiemap_extent_info *info,
876 struct bch_fs *c = vinode->i_sb->s_fs_info;
877 struct bch_inode_info *ei = to_bch_ei(vinode);
878 struct btree_trans trans;
879 struct btree_iter iter;
881 struct bkey_buf cur, prev;
882 struct bpos end = POS(ei->v.i_ino, (start + len) >> 9);
883 unsigned offset_into_extent, sectors;
884 bool have_extent = false;
888 ret = fiemap_prep(&ei->v, info, start, &len, FIEMAP_FLAG_SYNC);
892 if (start + len < start)
897 bch2_bkey_buf_init(&cur);
898 bch2_bkey_buf_init(&prev);
899 bch2_trans_init(&trans, c, 0, 0);
901 bch2_trans_begin(&trans);
903 ret = bch2_subvolume_get_snapshot(&trans, ei->ei_subvol, &snapshot);
907 bch2_trans_iter_init(&trans, &iter, BTREE_ID_extents,
908 SPOS(ei->v.i_ino, start, snapshot), 0);
910 while (!(ret = btree_trans_too_many_iters(&trans)) &&
911 (k = bch2_btree_iter_peek_upto(&iter, end)).k &&
912 !(ret = bkey_err(k))) {
913 enum btree_id data_btree = BTREE_ID_extents;
915 if (!bkey_extent_is_data(k.k) &&
916 k.k->type != KEY_TYPE_reservation) {
917 bch2_btree_iter_advance(&iter);
921 offset_into_extent = iter.pos.offset -
922 bkey_start_offset(k.k);
923 sectors = k.k->size - offset_into_extent;
925 bch2_bkey_buf_reassemble(&cur, c, k);
927 ret = bch2_read_indirect_extent(&trans, &data_btree,
928 &offset_into_extent, &cur);
932 k = bkey_i_to_s_c(cur.k);
933 bch2_bkey_buf_realloc(&prev, c, k.k->u64s);
935 sectors = min(sectors, k.k->size - offset_into_extent);
937 bch2_cut_front(POS(k.k->p.inode,
938 bkey_start_offset(k.k) +
941 bch2_key_resize(&cur.k->k, sectors);
942 cur.k->k.p = iter.pos;
943 cur.k->k.p.offset += cur.k->k.size;
946 ret = bch2_fill_extent(c, info,
947 bkey_i_to_s_c(prev.k), 0);
952 bkey_copy(prev.k, cur.k);
955 bch2_btree_iter_set_pos(&iter,
956 POS(iter.pos.inode, iter.pos.offset + sectors));
958 start = iter.pos.offset;
959 bch2_trans_iter_exit(&trans, &iter);
961 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
964 if (!ret && have_extent)
965 ret = bch2_fill_extent(c, info, bkey_i_to_s_c(prev.k),
968 bch2_trans_exit(&trans);
969 bch2_bkey_buf_exit(&cur, c);
970 bch2_bkey_buf_exit(&prev, c);
971 return ret < 0 ? ret : 0;
974 static const struct vm_operations_struct bch_vm_ops = {
975 .fault = bch2_page_fault,
976 .map_pages = filemap_map_pages,
977 .page_mkwrite = bch2_page_mkwrite,
980 static int bch2_mmap(struct file *file, struct vm_area_struct *vma)
984 vma->vm_ops = &bch_vm_ops;
990 static loff_t bch2_dir_llseek(struct file *file, loff_t offset, int whence)
992 return generic_file_llseek_size(file, offset, whence,
996 static int bch2_vfs_readdir(struct file *file, struct dir_context *ctx)
998 struct bch_inode_info *inode = file_bch_inode(file);
999 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1001 if (!dir_emit_dots(file, ctx))
1004 return bch2_readdir(c, inode_inum(inode), ctx);
1007 static const struct file_operations bch_file_operations = {
1008 .llseek = bch2_llseek,
1009 .read_iter = bch2_read_iter,
1010 .write_iter = bch2_write_iter,
1012 .open = generic_file_open,
1013 .fsync = bch2_fsync,
1014 .splice_read = generic_file_splice_read,
1015 .splice_write = iter_file_splice_write,
1016 .fallocate = bch2_fallocate_dispatch,
1017 .unlocked_ioctl = bch2_fs_file_ioctl,
1018 #ifdef CONFIG_COMPAT
1019 .compat_ioctl = bch2_compat_fs_ioctl,
1021 .remap_file_range = bch2_remap_file_range,
1024 static const struct inode_operations bch_file_inode_operations = {
1025 .getattr = bch2_getattr,
1026 .setattr = bch2_setattr,
1027 .fiemap = bch2_fiemap,
1028 .listxattr = bch2_xattr_list,
1029 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1030 .get_acl = bch2_get_acl,
1031 .set_acl = bch2_set_acl,
1035 static const struct inode_operations bch_dir_inode_operations = {
1036 .lookup = bch2_lookup,
1037 .create = bch2_create,
1039 .unlink = bch2_unlink,
1040 .symlink = bch2_symlink,
1041 .mkdir = bch2_mkdir,
1042 .rmdir = bch2_unlink,
1043 .mknod = bch2_mknod,
1044 .rename = bch2_rename2,
1045 .getattr = bch2_getattr,
1046 .setattr = bch2_setattr,
1047 .tmpfile = bch2_tmpfile,
1048 .listxattr = bch2_xattr_list,
1049 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1050 .get_acl = bch2_get_acl,
1051 .set_acl = bch2_set_acl,
1055 static const struct file_operations bch_dir_file_operations = {
1056 .llseek = bch2_dir_llseek,
1057 .read = generic_read_dir,
1058 .iterate_shared = bch2_vfs_readdir,
1059 .fsync = bch2_fsync,
1060 .unlocked_ioctl = bch2_fs_file_ioctl,
1061 #ifdef CONFIG_COMPAT
1062 .compat_ioctl = bch2_compat_fs_ioctl,
1066 static const struct inode_operations bch_symlink_inode_operations = {
1067 .get_link = page_get_link,
1068 .getattr = bch2_getattr,
1069 .setattr = bch2_setattr,
1070 .listxattr = bch2_xattr_list,
1071 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1072 .get_acl = bch2_get_acl,
1073 .set_acl = bch2_set_acl,
1077 static const struct inode_operations bch_special_inode_operations = {
1078 .getattr = bch2_getattr,
1079 .setattr = bch2_setattr,
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 address_space_operations bch_address_space_operations = {
1088 .read_folio = bch2_read_folio,
1089 .writepages = bch2_writepages,
1090 .readahead = bch2_readahead,
1091 .dirty_folio = filemap_dirty_folio,
1092 .write_begin = bch2_write_begin,
1093 .write_end = bch2_write_end,
1094 .invalidate_folio = bch2_invalidate_folio,
1095 .release_folio = bch2_release_folio,
1096 .direct_IO = noop_direct_IO,
1097 #ifdef CONFIG_MIGRATION
1098 .migrate_folio = filemap_migrate_folio,
1100 .error_remove_page = generic_error_remove_page,
1103 struct bcachefs_fid {
1109 struct bcachefs_fid_with_parent {
1110 struct bcachefs_fid fid;
1111 struct bcachefs_fid dir;
1114 static int bcachefs_fid_valid(int fh_len, int fh_type)
1117 case FILEID_BCACHEFS_WITHOUT_PARENT:
1118 return fh_len == sizeof(struct bcachefs_fid) / sizeof(u32);
1119 case FILEID_BCACHEFS_WITH_PARENT:
1120 return fh_len == sizeof(struct bcachefs_fid_with_parent) / sizeof(u32);
1126 static struct bcachefs_fid bch2_inode_to_fid(struct bch_inode_info *inode)
1128 return (struct bcachefs_fid) {
1129 .inum = inode->ei_inode.bi_inum,
1130 .subvol = inode->ei_subvol,
1131 .gen = inode->ei_inode.bi_generation,
1135 static int bch2_encode_fh(struct inode *vinode, u32 *fh, int *len,
1138 struct bch_inode_info *inode = to_bch_ei(vinode);
1139 struct bch_inode_info *dir = to_bch_ei(vdir);
1141 if (*len < sizeof(struct bcachefs_fid_with_parent) / sizeof(u32))
1142 return FILEID_INVALID;
1144 if (!S_ISDIR(inode->v.i_mode) && dir) {
1145 struct bcachefs_fid_with_parent *fid = (void *) fh;
1147 fid->fid = bch2_inode_to_fid(inode);
1148 fid->dir = bch2_inode_to_fid(dir);
1150 *len = sizeof(*fid) / sizeof(u32);
1151 return FILEID_BCACHEFS_WITH_PARENT;
1153 struct bcachefs_fid *fid = (void *) fh;
1155 *fid = bch2_inode_to_fid(inode);
1157 *len = sizeof(*fid) / sizeof(u32);
1158 return FILEID_BCACHEFS_WITHOUT_PARENT;
1162 static struct inode *bch2_nfs_get_inode(struct super_block *sb,
1163 struct bcachefs_fid fid)
1165 struct bch_fs *c = sb->s_fs_info;
1166 struct inode *vinode = bch2_vfs_inode_get(c, (subvol_inum) {
1167 .subvol = fid.subvol,
1170 if (!IS_ERR(vinode) && vinode->i_generation != fid.gen) {
1172 vinode = ERR_PTR(-ESTALE);
1177 static struct dentry *bch2_fh_to_dentry(struct super_block *sb, struct fid *_fid,
1178 int fh_len, int fh_type)
1180 struct bcachefs_fid *fid = (void *) _fid;
1182 if (!bcachefs_fid_valid(fh_len, fh_type))
1185 return d_obtain_alias(bch2_nfs_get_inode(sb, *fid));
1188 static struct dentry *bch2_fh_to_parent(struct super_block *sb, struct fid *_fid,
1189 int fh_len, int fh_type)
1191 struct bcachefs_fid_with_parent *fid = (void *) _fid;
1193 if (!bcachefs_fid_valid(fh_len, fh_type) ||
1194 fh_type != FILEID_BCACHEFS_WITH_PARENT)
1197 return d_obtain_alias(bch2_nfs_get_inode(sb, fid->dir));
1200 static struct dentry *bch2_get_parent(struct dentry *child)
1202 struct bch_inode_info *inode = to_bch_ei(child->d_inode);
1203 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1204 subvol_inum parent_inum = {
1205 .subvol = inode->ei_inode.bi_parent_subvol ?:
1207 .inum = inode->ei_inode.bi_dir,
1210 if (!parent_inum.inum)
1213 return d_obtain_alias(bch2_vfs_inode_get(c, parent_inum));
1216 static int bch2_get_name(struct dentry *parent, char *name, struct dentry *child)
1218 struct bch_inode_info *inode = to_bch_ei(child->d_inode);
1219 struct bch_inode_info *dir = to_bch_ei(parent->d_inode);
1220 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1221 struct btree_trans trans;
1222 struct btree_iter iter1;
1223 struct btree_iter iter2;
1225 struct bkey_s_c_dirent d;
1226 struct bch_inode_unpacked inode_u;
1232 if (!S_ISDIR(dir->v.i_mode))
1235 bch2_trans_init(&trans, c, 0, 0);
1237 bch2_trans_iter_init(&trans, &iter1, BTREE_ID_dirents,
1238 POS(dir->ei_inode.bi_inum, 0), 0);
1239 bch2_trans_iter_init(&trans, &iter2, BTREE_ID_dirents,
1240 POS(dir->ei_inode.bi_inum, 0), 0);
1242 bch2_trans_begin(&trans);
1244 ret = bch2_subvolume_get_snapshot(&trans, dir->ei_subvol, &snapshot);
1248 bch2_btree_iter_set_snapshot(&iter1, snapshot);
1249 bch2_btree_iter_set_snapshot(&iter2, snapshot);
1251 ret = bch2_inode_find_by_inum_trans(&trans, inode_inum(inode), &inode_u);
1255 if (inode_u.bi_dir == dir->ei_inode.bi_inum) {
1256 bch2_btree_iter_set_pos(&iter1, POS(inode_u.bi_dir, inode_u.bi_dir_offset));
1258 k = bch2_btree_iter_peek_slot(&iter1);
1263 if (k.k->type != KEY_TYPE_dirent) {
1268 d = bkey_s_c_to_dirent(k);
1269 ret = bch2_dirent_read_target(&trans, inode_inum(dir), d, &target);
1275 if (target.subvol == inode->ei_subvol &&
1276 target.inum == inode->ei_inode.bi_inum)
1280 * File with multiple hardlinks and our backref is to the wrong
1281 * directory - linear search:
1283 for_each_btree_key_continue_norestart(iter2, 0, k, ret) {
1284 if (k.k->p.inode > dir->ei_inode.bi_inum)
1287 if (k.k->type != KEY_TYPE_dirent)
1290 d = bkey_s_c_to_dirent(k);
1291 ret = bch2_dirent_read_target(&trans, inode_inum(dir), d, &target);
1297 if (target.subvol == inode->ei_subvol &&
1298 target.inum == inode->ei_inode.bi_inum)
1306 name_len = min_t(unsigned, bch2_dirent_name_bytes(d), NAME_MAX);
1308 memcpy(name, d.v->d_name, name_len);
1309 name[name_len] = '\0';
1311 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
1314 bch2_trans_iter_exit(&trans, &iter1);
1315 bch2_trans_iter_exit(&trans, &iter2);
1316 bch2_trans_exit(&trans);
1321 static const struct export_operations bch_export_ops = {
1322 .encode_fh = bch2_encode_fh,
1323 .fh_to_dentry = bch2_fh_to_dentry,
1324 .fh_to_parent = bch2_fh_to_parent,
1325 .get_parent = bch2_get_parent,
1326 .get_name = bch2_get_name,
1329 static void bch2_vfs_inode_init(struct btree_trans *trans, subvol_inum inum,
1330 struct bch_inode_info *inode,
1331 struct bch_inode_unpacked *bi,
1332 struct bch_subvolume *subvol)
1334 bch2_inode_update_after_write(trans, inode, bi, ~0);
1336 if (BCH_SUBVOLUME_SNAP(subvol))
1337 set_bit(EI_INODE_SNAPSHOT, &inode->ei_flags);
1339 clear_bit(EI_INODE_SNAPSHOT, &inode->ei_flags);
1341 inode->v.i_blocks = bi->bi_sectors;
1342 inode->v.i_ino = bi->bi_inum;
1343 inode->v.i_rdev = bi->bi_dev;
1344 inode->v.i_generation = bi->bi_generation;
1345 inode->v.i_size = bi->bi_size;
1347 inode->ei_flags = 0;
1348 inode->ei_quota_reserved = 0;
1349 inode->ei_qid = bch_qid(bi);
1350 inode->ei_subvol = inum.subvol;
1352 inode->v.i_mapping->a_ops = &bch_address_space_operations;
1354 switch (inode->v.i_mode & S_IFMT) {
1356 inode->v.i_op = &bch_file_inode_operations;
1357 inode->v.i_fop = &bch_file_operations;
1360 inode->v.i_op = &bch_dir_inode_operations;
1361 inode->v.i_fop = &bch_dir_file_operations;
1364 inode_nohighmem(&inode->v);
1365 inode->v.i_op = &bch_symlink_inode_operations;
1368 init_special_inode(&inode->v, inode->v.i_mode, inode->v.i_rdev);
1369 inode->v.i_op = &bch_special_inode_operations;
1373 mapping_set_large_folios(inode->v.i_mapping);
1376 static struct inode *bch2_alloc_inode(struct super_block *sb)
1378 struct bch_inode_info *inode;
1380 inode = kmem_cache_alloc(bch2_inode_cache, GFP_NOFS);
1384 inode_init_once(&inode->v);
1385 mutex_init(&inode->ei_update_lock);
1386 two_state_lock_init(&inode->ei_pagecache_lock);
1387 INIT_LIST_HEAD(&inode->ei_vfs_inode_list);
1388 mutex_init(&inode->ei_quota_lock);
1393 static void bch2_i_callback(struct rcu_head *head)
1395 struct inode *vinode = container_of(head, struct inode, i_rcu);
1396 struct bch_inode_info *inode = to_bch_ei(vinode);
1398 kmem_cache_free(bch2_inode_cache, inode);
1401 static void bch2_destroy_inode(struct inode *vinode)
1403 call_rcu(&vinode->i_rcu, bch2_i_callback);
1406 static int inode_update_times_fn(struct bch_inode_info *inode,
1407 struct bch_inode_unpacked *bi,
1410 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1412 bi->bi_atime = timespec_to_bch2_time(c, inode->v.i_atime);
1413 bi->bi_mtime = timespec_to_bch2_time(c, inode->v.i_mtime);
1414 bi->bi_ctime = timespec_to_bch2_time(c, inode->v.i_ctime);
1419 static int bch2_vfs_write_inode(struct inode *vinode,
1420 struct writeback_control *wbc)
1422 struct bch_fs *c = vinode->i_sb->s_fs_info;
1423 struct bch_inode_info *inode = to_bch_ei(vinode);
1426 mutex_lock(&inode->ei_update_lock);
1427 ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
1428 ATTR_ATIME|ATTR_MTIME|ATTR_CTIME);
1429 mutex_unlock(&inode->ei_update_lock);
1431 return bch2_err_class(ret);
1434 static void bch2_evict_inode(struct inode *vinode)
1436 struct bch_fs *c = vinode->i_sb->s_fs_info;
1437 struct bch_inode_info *inode = to_bch_ei(vinode);
1439 truncate_inode_pages_final(&inode->v.i_data);
1441 clear_inode(&inode->v);
1443 BUG_ON(!is_bad_inode(&inode->v) && inode->ei_quota_reserved);
1445 if (!inode->v.i_nlink && !is_bad_inode(&inode->v)) {
1446 bch2_quota_acct(c, inode->ei_qid, Q_SPC, -((s64) inode->v.i_blocks),
1447 KEY_TYPE_QUOTA_WARN);
1448 bch2_quota_acct(c, inode->ei_qid, Q_INO, -1,
1449 KEY_TYPE_QUOTA_WARN);
1450 bch2_inode_rm(c, inode_inum(inode));
1453 mutex_lock(&c->vfs_inodes_lock);
1454 list_del_init(&inode->ei_vfs_inode_list);
1455 mutex_unlock(&c->vfs_inodes_lock);
1458 void bch2_evict_subvolume_inodes(struct bch_fs *c, snapshot_id_list *s)
1460 struct bch_inode_info *inode, **i;
1461 DARRAY(struct bch_inode_info *) grabbed;
1462 bool clean_pass = false, this_pass_clean;
1465 * Initially, we scan for inodes without I_DONTCACHE, then mark them to
1466 * be pruned with d_mark_dontcache().
1468 * Once we've had a clean pass where we didn't find any inodes without
1469 * I_DONTCACHE, we wait for them to be freed:
1472 darray_init(&grabbed);
1473 darray_make_room(&grabbed, 1024);
1476 this_pass_clean = true;
1478 mutex_lock(&c->vfs_inodes_lock);
1479 list_for_each_entry(inode, &c->vfs_inodes_list, ei_vfs_inode_list) {
1480 if (!snapshot_list_has_id(s, inode->ei_subvol))
1483 if (!(inode->v.i_state & I_DONTCACHE) &&
1484 !(inode->v.i_state & I_FREEING)) {
1485 this_pass_clean = false;
1487 d_mark_dontcache(&inode->v);
1488 d_prune_aliases(&inode->v);
1491 * If i_count was zero, we have to take and release a
1492 * ref in order for I_DONTCACHE to be noticed and the
1493 * inode to be dropped;
1496 if (!atomic_read(&inode->v.i_count) &&
1498 darray_push_gfp(&grabbed, inode, GFP_ATOMIC|__GFP_NOWARN))
1500 } else if (clean_pass && this_pass_clean) {
1501 wait_queue_head_t *wq = bit_waitqueue(&inode->v.i_state, __I_NEW);
1502 DEFINE_WAIT_BIT(wait, &inode->v.i_state, __I_NEW);
1504 prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
1505 mutex_unlock(&c->vfs_inodes_lock);
1508 finish_wait(wq, &wait.wq_entry);
1512 mutex_unlock(&c->vfs_inodes_lock);
1514 darray_for_each(grabbed, i)
1518 if (!clean_pass || !this_pass_clean) {
1519 clean_pass = this_pass_clean;
1523 darray_exit(&grabbed);
1526 static int bch2_statfs(struct dentry *dentry, struct kstatfs *buf)
1528 struct super_block *sb = dentry->d_sb;
1529 struct bch_fs *c = sb->s_fs_info;
1530 struct bch_fs_usage_short usage = bch2_fs_usage_read_short(c);
1531 unsigned shift = sb->s_blocksize_bits - 9;
1533 * this assumes inodes take up 64 bytes, which is a decent average
1536 u64 avail_inodes = ((usage.capacity - usage.used) << 3);
1539 buf->f_type = BCACHEFS_STATFS_MAGIC;
1540 buf->f_bsize = sb->s_blocksize;
1541 buf->f_blocks = usage.capacity >> shift;
1542 buf->f_bfree = usage.free >> shift;
1543 buf->f_bavail = avail_factor(usage.free) >> shift;
1545 buf->f_files = usage.nr_inodes + avail_inodes;
1546 buf->f_ffree = avail_inodes;
1548 fsid = le64_to_cpup((void *) c->sb.user_uuid.b) ^
1549 le64_to_cpup((void *) c->sb.user_uuid.b + sizeof(u64));
1550 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1551 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1552 buf->f_namelen = BCH_NAME_MAX;
1557 static int bch2_sync_fs(struct super_block *sb, int wait)
1559 struct bch_fs *c = sb->s_fs_info;
1562 if (c->opts.journal_flush_disabled)
1566 bch2_journal_flush_async(&c->journal, NULL);
1570 ret = bch2_journal_flush(&c->journal);
1571 return bch2_err_class(ret);
1574 static struct bch_fs *bch2_path_to_fs(const char *path)
1580 ret = lookup_bdev(path, &dev);
1582 return ERR_PTR(ret);
1584 c = bch2_dev_to_fs(dev);
1586 closure_put(&c->cl);
1587 return c ?: ERR_PTR(-ENOENT);
1590 static char **split_devs(const char *_dev_name, unsigned *nr)
1592 char *dev_name = NULL, **devs = NULL, *s;
1593 size_t i, nr_devs = 0;
1595 dev_name = kstrdup(_dev_name, GFP_KERNEL);
1599 for (s = dev_name; s; s = strchr(s + 1, ':'))
1602 devs = kcalloc(nr_devs + 1, sizeof(const char *), GFP_KERNEL);
1608 for (i = 0, s = dev_name;
1610 (s = strchr(s, ':')) && (*s++ = '\0'))
1617 static int bch2_remount(struct super_block *sb, int *flags, char *data)
1619 struct bch_fs *c = sb->s_fs_info;
1620 struct bch_opts opts = bch2_opts_empty();
1623 opt_set(opts, read_only, (*flags & SB_RDONLY) != 0);
1625 ret = bch2_parse_mount_opts(c, &opts, data);
1629 if (opts.read_only != c->opts.read_only) {
1630 down_write(&c->state_lock);
1632 if (opts.read_only) {
1633 bch2_fs_read_only(c);
1635 sb->s_flags |= SB_RDONLY;
1637 ret = bch2_fs_read_write(c);
1639 bch_err(c, "error going rw: %i", ret);
1640 up_write(&c->state_lock);
1645 sb->s_flags &= ~SB_RDONLY;
1648 c->opts.read_only = opts.read_only;
1650 up_write(&c->state_lock);
1653 if (opts.errors >= 0)
1654 c->opts.errors = opts.errors;
1656 return bch2_err_class(ret);
1659 static int bch2_show_devname(struct seq_file *seq, struct dentry *root)
1661 struct bch_fs *c = root->d_sb->s_fs_info;
1666 for_each_online_member(ca, c, i) {
1670 seq_puts(seq, "/dev/");
1671 seq_puts(seq, ca->name);
1677 static int bch2_show_options(struct seq_file *seq, struct dentry *root)
1679 struct bch_fs *c = root->d_sb->s_fs_info;
1681 struct printbuf buf = PRINTBUF;
1684 for (i = 0; i < bch2_opts_nr; i++) {
1685 const struct bch_option *opt = &bch2_opt_table[i];
1686 u64 v = bch2_opt_get_by_id(&c->opts, i);
1688 if (!(opt->flags & OPT_MOUNT))
1691 if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
1694 printbuf_reset(&buf);
1695 bch2_opt_to_text(&buf, c, c->disk_sb.sb, opt, v,
1696 OPT_SHOW_MOUNT_STYLE);
1698 seq_puts(seq, buf.buf);
1701 if (buf.allocation_failure)
1703 printbuf_exit(&buf);
1707 static void bch2_put_super(struct super_block *sb)
1709 struct bch_fs *c = sb->s_fs_info;
1714 static const struct super_operations bch_super_operations = {
1715 .alloc_inode = bch2_alloc_inode,
1716 .destroy_inode = bch2_destroy_inode,
1717 .write_inode = bch2_vfs_write_inode,
1718 .evict_inode = bch2_evict_inode,
1719 .sync_fs = bch2_sync_fs,
1720 .statfs = bch2_statfs,
1721 .show_devname = bch2_show_devname,
1722 .show_options = bch2_show_options,
1723 .remount_fs = bch2_remount,
1724 .put_super = bch2_put_super,
1726 .freeze_fs = bch2_freeze,
1727 .unfreeze_fs = bch2_unfreeze,
1731 static int bch2_set_super(struct super_block *s, void *data)
1733 s->s_fs_info = data;
1737 static int bch2_noset_super(struct super_block *s, void *data)
1742 static int bch2_test_super(struct super_block *s, void *data)
1744 struct bch_fs *c = s->s_fs_info;
1745 struct bch_fs **devs = data;
1751 for (i = 0; devs[i]; i++)
1757 static struct dentry *bch2_mount(struct file_system_type *fs_type,
1758 int flags, const char *dev_name, void *data)
1762 struct super_block *sb;
1763 struct inode *vinode;
1764 struct bch_opts opts = bch2_opts_empty();
1766 struct bch_fs **devs_to_fs = NULL;
1767 unsigned i, nr_devs;
1770 opt_set(opts, read_only, (flags & SB_RDONLY) != 0);
1772 ret = bch2_parse_mount_opts(NULL, &opts, data);
1774 return ERR_PTR(ret);
1776 if (!dev_name || strlen(dev_name) == 0)
1777 return ERR_PTR(-EINVAL);
1779 devs = split_devs(dev_name, &nr_devs);
1781 return ERR_PTR(-ENOMEM);
1783 devs_to_fs = kcalloc(nr_devs + 1, sizeof(void *), GFP_KERNEL);
1785 sb = ERR_PTR(-ENOMEM);
1789 for (i = 0; i < nr_devs; i++)
1790 devs_to_fs[i] = bch2_path_to_fs(devs[i]);
1792 sb = sget(fs_type, bch2_test_super, bch2_noset_super,
1793 flags|SB_NOSEC, devs_to_fs);
1797 c = bch2_fs_open(devs, nr_devs, opts);
1803 /* Some options can't be parsed until after the fs is started: */
1804 ret = bch2_parse_mount_opts(c, &opts, data);
1811 bch2_opts_apply(&c->opts, opts);
1813 sb = sget(fs_type, NULL, bch2_set_super, flags|SB_NOSEC, c);
1823 ret = bch2_err_class(ret);
1824 return ERR_PTR(ret);
1830 if ((flags ^ sb->s_flags) & SB_RDONLY) {
1837 sb->s_blocksize = block_bytes(c);
1838 sb->s_blocksize_bits = ilog2(block_bytes(c));
1839 sb->s_maxbytes = MAX_LFS_FILESIZE;
1840 sb->s_op = &bch_super_operations;
1841 sb->s_export_op = &bch_export_ops;
1842 #ifdef CONFIG_BCACHEFS_QUOTA
1843 sb->s_qcop = &bch2_quotactl_operations;
1844 sb->s_quota_types = QTYPE_MASK_USR|QTYPE_MASK_GRP|QTYPE_MASK_PRJ;
1846 sb->s_xattr = bch2_xattr_handlers;
1847 sb->s_magic = BCACHEFS_STATFS_MAGIC;
1848 sb->s_time_gran = c->sb.nsec_per_time_unit;
1849 sb->s_time_min = div_s64(S64_MIN, c->sb.time_units_per_sec) + 1;
1850 sb->s_time_max = div_s64(S64_MAX, c->sb.time_units_per_sec);
1852 strscpy(sb->s_id, c->name, sizeof(sb->s_id));
1854 ret = super_setup_bdi(sb);
1858 sb->s_bdi->ra_pages = VM_READAHEAD_PAGES;
1860 for_each_online_member(ca, c, i) {
1861 struct block_device *bdev = ca->disk_sb.bdev;
1863 /* XXX: create an anonymous device for multi device filesystems */
1865 sb->s_dev = bdev->bd_dev;
1866 percpu_ref_put(&ca->io_ref);
1872 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1874 sb->s_flags |= SB_POSIXACL;
1877 sb->s_shrink.seeks = 0;
1879 vinode = bch2_vfs_inode_get(c, BCACHEFS_ROOT_SUBVOL_INUM);
1880 ret = PTR_ERR_OR_ZERO(vinode);
1882 bch_err(c, "error mounting: error getting root inode: %s", bch2_err_str(ret));
1886 sb->s_root = d_make_root(vinode);
1888 bch_err(c, "error mounting: error allocating root dentry");
1893 sb->s_flags |= SB_ACTIVE;
1895 return dget(sb->s_root);
1898 deactivate_locked_super(sb);
1899 return ERR_PTR(bch2_err_class(ret));
1902 static void bch2_kill_sb(struct super_block *sb)
1904 struct bch_fs *c = sb->s_fs_info;
1906 generic_shutdown_super(sb);
1910 static struct file_system_type bcache_fs_type = {
1911 .owner = THIS_MODULE,
1913 .mount = bch2_mount,
1914 .kill_sb = bch2_kill_sb,
1915 .fs_flags = FS_REQUIRES_DEV,
1918 MODULE_ALIAS_FS("bcachefs");
1920 void bch2_vfs_exit(void)
1922 unregister_filesystem(&bcache_fs_type);
1923 kmem_cache_destroy(bch2_inode_cache);
1926 int __init bch2_vfs_init(void)
1930 bch2_inode_cache = KMEM_CACHE(bch_inode_info, 0);
1931 if (!bch2_inode_cache)
1934 ret = register_filesystem(&bcache_fs_type);
1944 #endif /* NO_BCACHEFS_FS */