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(bch2_err_matches(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 bch2_trans_unlock(&trans);
947 ret = bch2_fill_extent(c, info,
948 bkey_i_to_s_c(prev.k), 0);
953 bkey_copy(prev.k, cur.k);
956 bch2_btree_iter_set_pos(&iter,
957 POS(iter.pos.inode, iter.pos.offset + sectors));
959 start = iter.pos.offset;
960 bch2_trans_iter_exit(&trans, &iter);
962 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
965 if (!ret && have_extent) {
966 bch2_trans_unlock(&trans);
967 ret = bch2_fill_extent(c, info, bkey_i_to_s_c(prev.k),
971 bch2_trans_exit(&trans);
972 bch2_bkey_buf_exit(&cur, c);
973 bch2_bkey_buf_exit(&prev, c);
974 return ret < 0 ? ret : 0;
977 static const struct vm_operations_struct bch_vm_ops = {
978 .fault = bch2_page_fault,
979 .map_pages = filemap_map_pages,
980 .page_mkwrite = bch2_page_mkwrite,
983 static int bch2_mmap(struct file *file, struct vm_area_struct *vma)
987 vma->vm_ops = &bch_vm_ops;
993 static loff_t bch2_dir_llseek(struct file *file, loff_t offset, int whence)
995 return generic_file_llseek_size(file, offset, whence,
999 static int bch2_vfs_readdir(struct file *file, struct dir_context *ctx)
1001 struct bch_inode_info *inode = file_bch_inode(file);
1002 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1004 if (!dir_emit_dots(file, ctx))
1007 return bch2_readdir(c, inode_inum(inode), ctx);
1010 static const struct file_operations bch_file_operations = {
1011 .llseek = bch2_llseek,
1012 .read_iter = bch2_read_iter,
1013 .write_iter = bch2_write_iter,
1015 .open = generic_file_open,
1016 .fsync = bch2_fsync,
1017 .splice_read = filemap_splice_read,
1018 .splice_write = iter_file_splice_write,
1019 .fallocate = bch2_fallocate_dispatch,
1020 .unlocked_ioctl = bch2_fs_file_ioctl,
1021 #ifdef CONFIG_COMPAT
1022 .compat_ioctl = bch2_compat_fs_ioctl,
1024 .remap_file_range = bch2_remap_file_range,
1027 static const struct inode_operations bch_file_inode_operations = {
1028 .getattr = bch2_getattr,
1029 .setattr = bch2_setattr,
1030 .fiemap = bch2_fiemap,
1031 .listxattr = bch2_xattr_list,
1032 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1033 .get_acl = bch2_get_acl,
1034 .set_acl = bch2_set_acl,
1038 static const struct inode_operations bch_dir_inode_operations = {
1039 .lookup = bch2_lookup,
1040 .create = bch2_create,
1042 .unlink = bch2_unlink,
1043 .symlink = bch2_symlink,
1044 .mkdir = bch2_mkdir,
1045 .rmdir = bch2_unlink,
1046 .mknod = bch2_mknod,
1047 .rename = bch2_rename2,
1048 .getattr = bch2_getattr,
1049 .setattr = bch2_setattr,
1050 .tmpfile = bch2_tmpfile,
1051 .listxattr = bch2_xattr_list,
1052 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1053 .get_acl = bch2_get_acl,
1054 .set_acl = bch2_set_acl,
1058 static const struct file_operations bch_dir_file_operations = {
1059 .llseek = bch2_dir_llseek,
1060 .read = generic_read_dir,
1061 .iterate_shared = bch2_vfs_readdir,
1062 .fsync = bch2_fsync,
1063 .unlocked_ioctl = bch2_fs_file_ioctl,
1064 #ifdef CONFIG_COMPAT
1065 .compat_ioctl = bch2_compat_fs_ioctl,
1069 static const struct inode_operations bch_symlink_inode_operations = {
1070 .get_link = page_get_link,
1071 .getattr = bch2_getattr,
1072 .setattr = bch2_setattr,
1073 .listxattr = bch2_xattr_list,
1074 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1075 .get_acl = bch2_get_acl,
1076 .set_acl = bch2_set_acl,
1080 static const struct inode_operations bch_special_inode_operations = {
1081 .getattr = bch2_getattr,
1082 .setattr = bch2_setattr,
1083 .listxattr = bch2_xattr_list,
1084 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1085 .get_acl = bch2_get_acl,
1086 .set_acl = bch2_set_acl,
1090 static const struct address_space_operations bch_address_space_operations = {
1091 .read_folio = bch2_read_folio,
1092 .writepages = bch2_writepages,
1093 .readahead = bch2_readahead,
1094 .dirty_folio = filemap_dirty_folio,
1095 .write_begin = bch2_write_begin,
1096 .write_end = bch2_write_end,
1097 .invalidate_folio = bch2_invalidate_folio,
1098 .release_folio = bch2_release_folio,
1099 .direct_IO = noop_direct_IO,
1100 #ifdef CONFIG_MIGRATION
1101 .migrate_folio = filemap_migrate_folio,
1103 .error_remove_page = generic_error_remove_page,
1106 struct bcachefs_fid {
1112 struct bcachefs_fid_with_parent {
1113 struct bcachefs_fid fid;
1114 struct bcachefs_fid dir;
1117 static int bcachefs_fid_valid(int fh_len, int fh_type)
1120 case FILEID_BCACHEFS_WITHOUT_PARENT:
1121 return fh_len == sizeof(struct bcachefs_fid) / sizeof(u32);
1122 case FILEID_BCACHEFS_WITH_PARENT:
1123 return fh_len == sizeof(struct bcachefs_fid_with_parent) / sizeof(u32);
1129 static struct bcachefs_fid bch2_inode_to_fid(struct bch_inode_info *inode)
1131 return (struct bcachefs_fid) {
1132 .inum = inode->ei_inode.bi_inum,
1133 .subvol = inode->ei_subvol,
1134 .gen = inode->ei_inode.bi_generation,
1138 static int bch2_encode_fh(struct inode *vinode, u32 *fh, int *len,
1141 struct bch_inode_info *inode = to_bch_ei(vinode);
1142 struct bch_inode_info *dir = to_bch_ei(vdir);
1144 if (*len < sizeof(struct bcachefs_fid_with_parent) / sizeof(u32))
1145 return FILEID_INVALID;
1147 if (!S_ISDIR(inode->v.i_mode) && dir) {
1148 struct bcachefs_fid_with_parent *fid = (void *) fh;
1150 fid->fid = bch2_inode_to_fid(inode);
1151 fid->dir = bch2_inode_to_fid(dir);
1153 *len = sizeof(*fid) / sizeof(u32);
1154 return FILEID_BCACHEFS_WITH_PARENT;
1156 struct bcachefs_fid *fid = (void *) fh;
1158 *fid = bch2_inode_to_fid(inode);
1160 *len = sizeof(*fid) / sizeof(u32);
1161 return FILEID_BCACHEFS_WITHOUT_PARENT;
1165 static struct inode *bch2_nfs_get_inode(struct super_block *sb,
1166 struct bcachefs_fid fid)
1168 struct bch_fs *c = sb->s_fs_info;
1169 struct inode *vinode = bch2_vfs_inode_get(c, (subvol_inum) {
1170 .subvol = fid.subvol,
1173 if (!IS_ERR(vinode) && vinode->i_generation != fid.gen) {
1175 vinode = ERR_PTR(-ESTALE);
1180 static struct dentry *bch2_fh_to_dentry(struct super_block *sb, struct fid *_fid,
1181 int fh_len, int fh_type)
1183 struct bcachefs_fid *fid = (void *) _fid;
1185 if (!bcachefs_fid_valid(fh_len, fh_type))
1188 return d_obtain_alias(bch2_nfs_get_inode(sb, *fid));
1191 static struct dentry *bch2_fh_to_parent(struct super_block *sb, struct fid *_fid,
1192 int fh_len, int fh_type)
1194 struct bcachefs_fid_with_parent *fid = (void *) _fid;
1196 if (!bcachefs_fid_valid(fh_len, fh_type) ||
1197 fh_type != FILEID_BCACHEFS_WITH_PARENT)
1200 return d_obtain_alias(bch2_nfs_get_inode(sb, fid->dir));
1203 static struct dentry *bch2_get_parent(struct dentry *child)
1205 struct bch_inode_info *inode = to_bch_ei(child->d_inode);
1206 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1207 subvol_inum parent_inum = {
1208 .subvol = inode->ei_inode.bi_parent_subvol ?:
1210 .inum = inode->ei_inode.bi_dir,
1213 if (!parent_inum.inum)
1216 return d_obtain_alias(bch2_vfs_inode_get(c, parent_inum));
1219 static int bch2_get_name(struct dentry *parent, char *name, struct dentry *child)
1221 struct bch_inode_info *inode = to_bch_ei(child->d_inode);
1222 struct bch_inode_info *dir = to_bch_ei(parent->d_inode);
1223 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1224 struct btree_trans trans;
1225 struct btree_iter iter1;
1226 struct btree_iter iter2;
1228 struct bkey_s_c_dirent d;
1229 struct bch_inode_unpacked inode_u;
1235 if (!S_ISDIR(dir->v.i_mode))
1238 bch2_trans_init(&trans, c, 0, 0);
1240 bch2_trans_iter_init(&trans, &iter1, BTREE_ID_dirents,
1241 POS(dir->ei_inode.bi_inum, 0), 0);
1242 bch2_trans_iter_init(&trans, &iter2, BTREE_ID_dirents,
1243 POS(dir->ei_inode.bi_inum, 0), 0);
1245 bch2_trans_begin(&trans);
1247 ret = bch2_subvolume_get_snapshot(&trans, dir->ei_subvol, &snapshot);
1251 bch2_btree_iter_set_snapshot(&iter1, snapshot);
1252 bch2_btree_iter_set_snapshot(&iter2, snapshot);
1254 ret = bch2_inode_find_by_inum_trans(&trans, inode_inum(inode), &inode_u);
1258 if (inode_u.bi_dir == dir->ei_inode.bi_inum) {
1259 bch2_btree_iter_set_pos(&iter1, POS(inode_u.bi_dir, inode_u.bi_dir_offset));
1261 k = bch2_btree_iter_peek_slot(&iter1);
1266 if (k.k->type != KEY_TYPE_dirent) {
1267 ret = -BCH_ERR_ENOENT_dirent_doesnt_match_inode;
1271 d = bkey_s_c_to_dirent(k);
1272 ret = bch2_dirent_read_target(&trans, inode_inum(dir), d, &target);
1274 ret = -BCH_ERR_ENOENT_dirent_doesnt_match_inode;
1278 if (target.subvol == inode->ei_subvol &&
1279 target.inum == inode->ei_inode.bi_inum)
1283 * File with multiple hardlinks and our backref is to the wrong
1284 * directory - linear search:
1286 for_each_btree_key_continue_norestart(iter2, 0, k, ret) {
1287 if (k.k->p.inode > dir->ei_inode.bi_inum)
1290 if (k.k->type != KEY_TYPE_dirent)
1293 d = bkey_s_c_to_dirent(k);
1294 ret = bch2_dirent_read_target(&trans, inode_inum(dir), d, &target);
1300 if (target.subvol == inode->ei_subvol &&
1301 target.inum == inode->ei_inode.bi_inum)
1309 name_len = min_t(unsigned, bch2_dirent_name_bytes(d), NAME_MAX);
1311 memcpy(name, d.v->d_name, name_len);
1312 name[name_len] = '\0';
1314 if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
1317 bch2_trans_iter_exit(&trans, &iter1);
1318 bch2_trans_iter_exit(&trans, &iter2);
1319 bch2_trans_exit(&trans);
1324 static const struct export_operations bch_export_ops = {
1325 .encode_fh = bch2_encode_fh,
1326 .fh_to_dentry = bch2_fh_to_dentry,
1327 .fh_to_parent = bch2_fh_to_parent,
1328 .get_parent = bch2_get_parent,
1329 .get_name = bch2_get_name,
1332 static void bch2_vfs_inode_init(struct btree_trans *trans, subvol_inum inum,
1333 struct bch_inode_info *inode,
1334 struct bch_inode_unpacked *bi,
1335 struct bch_subvolume *subvol)
1337 bch2_inode_update_after_write(trans, inode, bi, ~0);
1339 if (BCH_SUBVOLUME_SNAP(subvol))
1340 set_bit(EI_INODE_SNAPSHOT, &inode->ei_flags);
1342 clear_bit(EI_INODE_SNAPSHOT, &inode->ei_flags);
1344 inode->v.i_blocks = bi->bi_sectors;
1345 inode->v.i_ino = bi->bi_inum;
1346 inode->v.i_rdev = bi->bi_dev;
1347 inode->v.i_generation = bi->bi_generation;
1348 inode->v.i_size = bi->bi_size;
1350 inode->ei_flags = 0;
1351 inode->ei_quota_reserved = 0;
1352 inode->ei_qid = bch_qid(bi);
1353 inode->ei_subvol = inum.subvol;
1355 inode->v.i_mapping->a_ops = &bch_address_space_operations;
1357 switch (inode->v.i_mode & S_IFMT) {
1359 inode->v.i_op = &bch_file_inode_operations;
1360 inode->v.i_fop = &bch_file_operations;
1363 inode->v.i_op = &bch_dir_inode_operations;
1364 inode->v.i_fop = &bch_dir_file_operations;
1367 inode_nohighmem(&inode->v);
1368 inode->v.i_op = &bch_symlink_inode_operations;
1371 init_special_inode(&inode->v, inode->v.i_mode, inode->v.i_rdev);
1372 inode->v.i_op = &bch_special_inode_operations;
1376 mapping_set_large_folios(inode->v.i_mapping);
1379 static struct inode *bch2_alloc_inode(struct super_block *sb)
1381 struct bch_inode_info *inode;
1383 inode = kmem_cache_alloc(bch2_inode_cache, GFP_NOFS);
1387 inode_init_once(&inode->v);
1388 mutex_init(&inode->ei_update_lock);
1389 two_state_lock_init(&inode->ei_pagecache_lock);
1390 INIT_LIST_HEAD(&inode->ei_vfs_inode_list);
1391 mutex_init(&inode->ei_quota_lock);
1396 static void bch2_i_callback(struct rcu_head *head)
1398 struct inode *vinode = container_of(head, struct inode, i_rcu);
1399 struct bch_inode_info *inode = to_bch_ei(vinode);
1401 kmem_cache_free(bch2_inode_cache, inode);
1404 static void bch2_destroy_inode(struct inode *vinode)
1406 call_rcu(&vinode->i_rcu, bch2_i_callback);
1409 static int inode_update_times_fn(struct bch_inode_info *inode,
1410 struct bch_inode_unpacked *bi,
1413 struct bch_fs *c = inode->v.i_sb->s_fs_info;
1415 bi->bi_atime = timespec_to_bch2_time(c, inode->v.i_atime);
1416 bi->bi_mtime = timespec_to_bch2_time(c, inode->v.i_mtime);
1417 bi->bi_ctime = timespec_to_bch2_time(c, inode->v.i_ctime);
1422 static int bch2_vfs_write_inode(struct inode *vinode,
1423 struct writeback_control *wbc)
1425 struct bch_fs *c = vinode->i_sb->s_fs_info;
1426 struct bch_inode_info *inode = to_bch_ei(vinode);
1429 mutex_lock(&inode->ei_update_lock);
1430 ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
1431 ATTR_ATIME|ATTR_MTIME|ATTR_CTIME);
1432 mutex_unlock(&inode->ei_update_lock);
1434 return bch2_err_class(ret);
1437 static void bch2_evict_inode(struct inode *vinode)
1439 struct bch_fs *c = vinode->i_sb->s_fs_info;
1440 struct bch_inode_info *inode = to_bch_ei(vinode);
1442 truncate_inode_pages_final(&inode->v.i_data);
1444 clear_inode(&inode->v);
1446 BUG_ON(!is_bad_inode(&inode->v) && inode->ei_quota_reserved);
1448 if (!inode->v.i_nlink && !is_bad_inode(&inode->v)) {
1449 bch2_quota_acct(c, inode->ei_qid, Q_SPC, -((s64) inode->v.i_blocks),
1450 KEY_TYPE_QUOTA_WARN);
1451 bch2_quota_acct(c, inode->ei_qid, Q_INO, -1,
1452 KEY_TYPE_QUOTA_WARN);
1453 bch2_inode_rm(c, inode_inum(inode));
1456 mutex_lock(&c->vfs_inodes_lock);
1457 list_del_init(&inode->ei_vfs_inode_list);
1458 mutex_unlock(&c->vfs_inodes_lock);
1461 void bch2_evict_subvolume_inodes(struct bch_fs *c, snapshot_id_list *s)
1463 struct bch_inode_info *inode, **i;
1464 DARRAY(struct bch_inode_info *) grabbed;
1465 bool clean_pass = false, this_pass_clean;
1468 * Initially, we scan for inodes without I_DONTCACHE, then mark them to
1469 * be pruned with d_mark_dontcache().
1471 * Once we've had a clean pass where we didn't find any inodes without
1472 * I_DONTCACHE, we wait for them to be freed:
1475 darray_init(&grabbed);
1476 darray_make_room(&grabbed, 1024);
1479 this_pass_clean = true;
1481 mutex_lock(&c->vfs_inodes_lock);
1482 list_for_each_entry(inode, &c->vfs_inodes_list, ei_vfs_inode_list) {
1483 if (!snapshot_list_has_id(s, inode->ei_subvol))
1486 if (!(inode->v.i_state & I_DONTCACHE) &&
1487 !(inode->v.i_state & I_FREEING) &&
1489 this_pass_clean = false;
1491 if (darray_push_gfp(&grabbed, inode, GFP_ATOMIC|__GFP_NOWARN)) {
1495 } else if (clean_pass && this_pass_clean) {
1496 wait_queue_head_t *wq = bit_waitqueue(&inode->v.i_state, __I_NEW);
1497 DEFINE_WAIT_BIT(wait, &inode->v.i_state, __I_NEW);
1499 prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
1500 mutex_unlock(&c->vfs_inodes_lock);
1503 finish_wait(wq, &wait.wq_entry);
1507 mutex_unlock(&c->vfs_inodes_lock);
1509 darray_for_each(grabbed, i) {
1511 d_mark_dontcache(&inode->v);
1512 d_prune_aliases(&inode->v);
1517 if (!clean_pass || !this_pass_clean) {
1518 clean_pass = this_pass_clean;
1522 darray_exit(&grabbed);
1525 static int bch2_statfs(struct dentry *dentry, struct kstatfs *buf)
1527 struct super_block *sb = dentry->d_sb;
1528 struct bch_fs *c = sb->s_fs_info;
1529 struct bch_fs_usage_short usage = bch2_fs_usage_read_short(c);
1530 unsigned shift = sb->s_blocksize_bits - 9;
1532 * this assumes inodes take up 64 bytes, which is a decent average
1535 u64 avail_inodes = ((usage.capacity - usage.used) << 3);
1538 buf->f_type = BCACHEFS_STATFS_MAGIC;
1539 buf->f_bsize = sb->s_blocksize;
1540 buf->f_blocks = usage.capacity >> shift;
1541 buf->f_bfree = usage.free >> shift;
1542 buf->f_bavail = avail_factor(usage.free) >> shift;
1544 buf->f_files = usage.nr_inodes + avail_inodes;
1545 buf->f_ffree = avail_inodes;
1547 fsid = le64_to_cpup((void *) c->sb.user_uuid.b) ^
1548 le64_to_cpup((void *) c->sb.user_uuid.b + sizeof(u64));
1549 buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
1550 buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
1551 buf->f_namelen = BCH_NAME_MAX;
1556 static int bch2_sync_fs(struct super_block *sb, int wait)
1558 struct bch_fs *c = sb->s_fs_info;
1561 if (c->opts.journal_flush_disabled)
1565 bch2_journal_flush_async(&c->journal, NULL);
1569 ret = bch2_journal_flush(&c->journal);
1570 return bch2_err_class(ret);
1573 static struct bch_fs *bch2_path_to_fs(const char *path)
1579 ret = lookup_bdev(path, &dev);
1581 return ERR_PTR(ret);
1583 c = bch2_dev_to_fs(dev);
1585 closure_put(&c->cl);
1586 return c ?: ERR_PTR(-ENOENT);
1589 static char **split_devs(const char *_dev_name, unsigned *nr)
1591 char *dev_name = NULL, **devs = NULL, *s;
1592 size_t i, nr_devs = 0;
1594 dev_name = kstrdup(_dev_name, GFP_KERNEL);
1598 for (s = dev_name; s; s = strchr(s + 1, ':'))
1601 devs = kcalloc(nr_devs + 1, sizeof(const char *), GFP_KERNEL);
1607 for (i = 0, s = dev_name;
1609 (s = strchr(s, ':')) && (*s++ = '\0'))
1616 static int bch2_remount(struct super_block *sb, int *flags, char *data)
1618 struct bch_fs *c = sb->s_fs_info;
1619 struct bch_opts opts = bch2_opts_empty();
1622 opt_set(opts, read_only, (*flags & SB_RDONLY) != 0);
1624 ret = bch2_parse_mount_opts(c, &opts, data);
1628 if (opts.read_only != c->opts.read_only) {
1629 down_write(&c->state_lock);
1631 if (opts.read_only) {
1632 bch2_fs_read_only(c);
1634 sb->s_flags |= SB_RDONLY;
1636 ret = bch2_fs_read_write(c);
1638 bch_err(c, "error going rw: %i", ret);
1639 up_write(&c->state_lock);
1644 sb->s_flags &= ~SB_RDONLY;
1647 c->opts.read_only = opts.read_only;
1649 up_write(&c->state_lock);
1652 if (opts.errors >= 0)
1653 c->opts.errors = opts.errors;
1655 return bch2_err_class(ret);
1658 static int bch2_show_devname(struct seq_file *seq, struct dentry *root)
1660 struct bch_fs *c = root->d_sb->s_fs_info;
1665 for_each_online_member(ca, c, i) {
1669 seq_puts(seq, "/dev/");
1670 seq_puts(seq, ca->name);
1676 static int bch2_show_options(struct seq_file *seq, struct dentry *root)
1678 struct bch_fs *c = root->d_sb->s_fs_info;
1680 struct printbuf buf = PRINTBUF;
1683 for (i = 0; i < bch2_opts_nr; i++) {
1684 const struct bch_option *opt = &bch2_opt_table[i];
1685 u64 v = bch2_opt_get_by_id(&c->opts, i);
1687 if (!(opt->flags & OPT_MOUNT))
1690 if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
1693 printbuf_reset(&buf);
1694 bch2_opt_to_text(&buf, c, c->disk_sb.sb, opt, v,
1695 OPT_SHOW_MOUNT_STYLE);
1697 seq_puts(seq, buf.buf);
1700 if (buf.allocation_failure)
1702 printbuf_exit(&buf);
1706 static void bch2_put_super(struct super_block *sb)
1708 struct bch_fs *c = sb->s_fs_info;
1713 static const struct super_operations bch_super_operations = {
1714 .alloc_inode = bch2_alloc_inode,
1715 .destroy_inode = bch2_destroy_inode,
1716 .write_inode = bch2_vfs_write_inode,
1717 .evict_inode = bch2_evict_inode,
1718 .sync_fs = bch2_sync_fs,
1719 .statfs = bch2_statfs,
1720 .show_devname = bch2_show_devname,
1721 .show_options = bch2_show_options,
1722 .remount_fs = bch2_remount,
1723 .put_super = bch2_put_super,
1725 .freeze_fs = bch2_freeze,
1726 .unfreeze_fs = bch2_unfreeze,
1730 static int bch2_set_super(struct super_block *s, void *data)
1732 s->s_fs_info = data;
1736 static int bch2_noset_super(struct super_block *s, void *data)
1741 static int bch2_test_super(struct super_block *s, void *data)
1743 struct bch_fs *c = s->s_fs_info;
1744 struct bch_fs **devs = data;
1750 for (i = 0; devs[i]; i++)
1756 static struct dentry *bch2_mount(struct file_system_type *fs_type,
1757 int flags, const char *dev_name, void *data)
1761 struct super_block *sb;
1762 struct inode *vinode;
1763 struct bch_opts opts = bch2_opts_empty();
1765 struct bch_fs **devs_to_fs = NULL;
1766 unsigned i, nr_devs;
1769 opt_set(opts, read_only, (flags & SB_RDONLY) != 0);
1771 ret = bch2_parse_mount_opts(NULL, &opts, data);
1773 return ERR_PTR(ret);
1775 if (!dev_name || strlen(dev_name) == 0)
1776 return ERR_PTR(-EINVAL);
1778 devs = split_devs(dev_name, &nr_devs);
1780 return ERR_PTR(-ENOMEM);
1782 devs_to_fs = kcalloc(nr_devs + 1, sizeof(void *), GFP_KERNEL);
1784 sb = ERR_PTR(-ENOMEM);
1788 for (i = 0; i < nr_devs; i++)
1789 devs_to_fs[i] = bch2_path_to_fs(devs[i]);
1791 sb = sget(fs_type, bch2_test_super, bch2_noset_super,
1792 flags|SB_NOSEC, devs_to_fs);
1796 c = bch2_fs_open(devs, nr_devs, opts);
1802 /* Some options can't be parsed until after the fs is started: */
1803 ret = bch2_parse_mount_opts(c, &opts, data);
1810 bch2_opts_apply(&c->opts, opts);
1812 sb = sget(fs_type, NULL, bch2_set_super, flags|SB_NOSEC, c);
1822 ret = bch2_err_class(ret);
1823 return ERR_PTR(ret);
1829 if ((flags ^ sb->s_flags) & SB_RDONLY) {
1836 sb->s_blocksize = block_bytes(c);
1837 sb->s_blocksize_bits = ilog2(block_bytes(c));
1838 sb->s_maxbytes = MAX_LFS_FILESIZE;
1839 sb->s_op = &bch_super_operations;
1840 sb->s_export_op = &bch_export_ops;
1841 #ifdef CONFIG_BCACHEFS_QUOTA
1842 sb->s_qcop = &bch2_quotactl_operations;
1843 sb->s_quota_types = QTYPE_MASK_USR|QTYPE_MASK_GRP|QTYPE_MASK_PRJ;
1845 sb->s_xattr = bch2_xattr_handlers;
1846 sb->s_magic = BCACHEFS_STATFS_MAGIC;
1847 sb->s_time_gran = c->sb.nsec_per_time_unit;
1848 sb->s_time_min = div_s64(S64_MIN, c->sb.time_units_per_sec) + 1;
1849 sb->s_time_max = div_s64(S64_MAX, c->sb.time_units_per_sec);
1851 strscpy(sb->s_id, c->name, sizeof(sb->s_id));
1853 ret = super_setup_bdi(sb);
1857 sb->s_bdi->ra_pages = VM_READAHEAD_PAGES;
1859 for_each_online_member(ca, c, i) {
1860 struct block_device *bdev = ca->disk_sb.bdev;
1862 /* XXX: create an anonymous device for multi device filesystems */
1864 sb->s_dev = bdev->bd_dev;
1865 percpu_ref_put(&ca->io_ref);
1871 #ifdef CONFIG_BCACHEFS_POSIX_ACL
1873 sb->s_flags |= SB_POSIXACL;
1876 sb->s_shrink.seeks = 0;
1878 vinode = bch2_vfs_inode_get(c, BCACHEFS_ROOT_SUBVOL_INUM);
1879 ret = PTR_ERR_OR_ZERO(vinode);
1881 bch_err(c, "error mounting: error getting root inode: %s", bch2_err_str(ret));
1885 sb->s_root = d_make_root(vinode);
1887 bch_err(c, "error mounting: error allocating root dentry");
1892 sb->s_flags |= SB_ACTIVE;
1894 return dget(sb->s_root);
1897 deactivate_locked_super(sb);
1898 return ERR_PTR(bch2_err_class(ret));
1901 static void bch2_kill_sb(struct super_block *sb)
1903 struct bch_fs *c = sb->s_fs_info;
1905 generic_shutdown_super(sb);
1909 static struct file_system_type bcache_fs_type = {
1910 .owner = THIS_MODULE,
1912 .mount = bch2_mount,
1913 .kill_sb = bch2_kill_sb,
1914 .fs_flags = FS_REQUIRES_DEV,
1917 MODULE_ALIAS_FS("bcachefs");
1919 void bch2_vfs_exit(void)
1921 unregister_filesystem(&bcache_fs_type);
1922 kmem_cache_destroy(bch2_inode_cache);
1925 int __init bch2_vfs_init(void)
1929 bch2_inode_cache = KMEM_CACHE(bch_inode_info, SLAB_RECLAIM_ACCOUNT);
1930 if (!bch2_inode_cache)
1933 ret = register_filesystem(&bcache_fs_type);
1943 #endif /* NO_BCACHEFS_FS */