--- /dev/null
+// SPDX-License-Identifier: GPL-2.0
+#ifndef NO_BCACHEFS_FS
+
+#include "bcachefs.h"
+#include "acl.h"
+#include "bkey_buf.h"
+#include "btree_update.h"
+#include "buckets.h"
+#include "chardev.h"
+#include "dirent.h"
+#include "errcode.h"
+#include "extents.h"
+#include "fs.h"
+#include "fs-common.h"
+#include "fs-io.h"
+#include "fs-ioctl.h"
+#include "fs-io-buffered.h"
+#include "fs-io-direct.h"
+#include "fs-io-pagecache.h"
+#include "fsck.h"
+#include "inode.h"
+#include "io_read.h"
+#include "journal.h"
+#include "keylist.h"
+#include "quota.h"
+#include "snapshot.h"
+#include "super.h"
+#include "xattr.h"
+
+#include <linux/aio.h>
+#include <linux/backing-dev.h>
+#include <linux/exportfs.h>
+#include <linux/fiemap.h>
+#include <linux/module.h>
+#include <linux/pagemap.h>
+#include <linux/posix_acl.h>
+#include <linux/random.h>
+#include <linux/seq_file.h>
+#include <linux/statfs.h>
+#include <linux/string.h>
+#include <linux/xattr.h>
+
+static struct kmem_cache *bch2_inode_cache;
+
+static void bch2_vfs_inode_init(struct btree_trans *, subvol_inum,
+ struct bch_inode_info *,
+ struct bch_inode_unpacked *,
+ struct bch_subvolume *);
+
+void bch2_inode_update_after_write(struct btree_trans *trans,
+ struct bch_inode_info *inode,
+ struct bch_inode_unpacked *bi,
+ unsigned fields)
+{
+ struct bch_fs *c = trans->c;
+
+ BUG_ON(bi->bi_inum != inode->v.i_ino);
+
+ bch2_assert_pos_locked(trans, BTREE_ID_inodes,
+ POS(0, bi->bi_inum),
+ c->opts.inodes_use_key_cache);
+
+ set_nlink(&inode->v, bch2_inode_nlink_get(bi));
+ i_uid_write(&inode->v, bi->bi_uid);
+ i_gid_write(&inode->v, bi->bi_gid);
+ inode->v.i_mode = bi->bi_mode;
+
+ if (fields & ATTR_ATIME)
+ inode_set_atime_to_ts(&inode->v, bch2_time_to_timespec(c, bi->bi_atime));
+ if (fields & ATTR_MTIME)
+ inode_set_mtime_to_ts(&inode->v, bch2_time_to_timespec(c, bi->bi_mtime));
+ if (fields & ATTR_CTIME)
+ inode_set_ctime_to_ts(&inode->v, bch2_time_to_timespec(c, bi->bi_ctime));
+
+ inode->ei_inode = *bi;
+
+ bch2_inode_flags_to_vfs(inode);
+}
+
+int __must_check bch2_write_inode(struct bch_fs *c,
+ struct bch_inode_info *inode,
+ inode_set_fn set,
+ void *p, unsigned fields)
+{
+ struct btree_trans *trans = bch2_trans_get(c);
+ struct btree_iter iter = { NULL };
+ struct bch_inode_unpacked inode_u;
+ int ret;
+retry:
+ bch2_trans_begin(trans);
+
+ ret = bch2_inode_peek(trans, &iter, &inode_u, inode_inum(inode),
+ BTREE_ITER_INTENT) ?:
+ (set ? set(trans, inode, &inode_u, p) : 0) ?:
+ bch2_inode_write(trans, &iter, &inode_u) ?:
+ bch2_trans_commit(trans, NULL, NULL, BCH_TRANS_COMMIT_no_enospc);
+
+ /*
+ * the btree node lock protects inode->ei_inode, not ei_update_lock;
+ * this is important for inode updates via bchfs_write_index_update
+ */
+ if (!ret)
+ bch2_inode_update_after_write(trans, inode, &inode_u, fields);
+
+ bch2_trans_iter_exit(trans, &iter);
+
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ goto retry;
+
+ bch2_fs_fatal_err_on(bch2_err_matches(ret, ENOENT), c,
+ "inode %u:%llu not found when updating",
+ inode_inum(inode).subvol,
+ inode_inum(inode).inum);
+
+ bch2_trans_put(trans);
+ return ret < 0 ? ret : 0;
+}
+
+int bch2_fs_quota_transfer(struct bch_fs *c,
+ struct bch_inode_info *inode,
+ struct bch_qid new_qid,
+ unsigned qtypes,
+ enum quota_acct_mode mode)
+{
+ unsigned i;
+ int ret;
+
+ qtypes &= enabled_qtypes(c);
+
+ for (i = 0; i < QTYP_NR; i++)
+ if (new_qid.q[i] == inode->ei_qid.q[i])
+ qtypes &= ~(1U << i);
+
+ if (!qtypes)
+ return 0;
+
+ mutex_lock(&inode->ei_quota_lock);
+
+ ret = bch2_quota_transfer(c, qtypes, new_qid,
+ inode->ei_qid,
+ inode->v.i_blocks +
+ inode->ei_quota_reserved,
+ mode);
+ if (!ret)
+ for (i = 0; i < QTYP_NR; i++)
+ if (qtypes & (1 << i))
+ inode->ei_qid.q[i] = new_qid.q[i];
+
+ mutex_unlock(&inode->ei_quota_lock);
+
+ return ret;
+}
+
+static int bch2_iget5_test(struct inode *vinode, void *p)
+{
+ struct bch_inode_info *inode = to_bch_ei(vinode);
+ subvol_inum *inum = p;
+
+ return inode->ei_subvol == inum->subvol &&
+ inode->ei_inode.bi_inum == inum->inum;
+}
+
+static int bch2_iget5_set(struct inode *vinode, void *p)
+{
+ struct bch_inode_info *inode = to_bch_ei(vinode);
+ subvol_inum *inum = p;
+
+ inode->v.i_ino = inum->inum;
+ inode->ei_subvol = inum->subvol;
+ inode->ei_inode.bi_inum = inum->inum;
+ return 0;
+}
+
+static unsigned bch2_inode_hash(subvol_inum inum)
+{
+ return jhash_3words(inum.subvol, inum.inum >> 32, inum.inum, JHASH_INITVAL);
+}
+
+struct inode *bch2_vfs_inode_get(struct bch_fs *c, subvol_inum inum)
+{
+ struct bch_inode_unpacked inode_u;
+ struct bch_inode_info *inode;
+ struct btree_trans *trans;
+ struct bch_subvolume subvol;
+ int ret;
+
+ inode = to_bch_ei(iget5_locked(c->vfs_sb,
+ bch2_inode_hash(inum),
+ bch2_iget5_test,
+ bch2_iget5_set,
+ &inum));
+ if (unlikely(!inode))
+ return ERR_PTR(-ENOMEM);
+ if (!(inode->v.i_state & I_NEW))
+ return &inode->v;
+
+ trans = bch2_trans_get(c);
+ ret = lockrestart_do(trans,
+ bch2_subvolume_get(trans, inum.subvol, true, 0, &subvol) ?:
+ bch2_inode_find_by_inum_trans(trans, inum, &inode_u));
+
+ if (!ret)
+ bch2_vfs_inode_init(trans, inum, inode, &inode_u, &subvol);
+ bch2_trans_put(trans);
+
+ if (ret) {
+ iget_failed(&inode->v);
+ return ERR_PTR(bch2_err_class(ret));
+ }
+
+ mutex_lock(&c->vfs_inodes_lock);
+ list_add(&inode->ei_vfs_inode_list, &c->vfs_inodes_list);
+ mutex_unlock(&c->vfs_inodes_lock);
+
+ unlock_new_inode(&inode->v);
+
+ return &inode->v;
+}
+
+struct bch_inode_info *
+__bch2_create(struct mnt_idmap *idmap,
+ struct bch_inode_info *dir, struct dentry *dentry,
+ umode_t mode, dev_t rdev, subvol_inum snapshot_src,
+ unsigned flags)
+{
+ struct bch_fs *c = dir->v.i_sb->s_fs_info;
+ struct btree_trans *trans;
+ struct bch_inode_unpacked dir_u;
+ struct bch_inode_info *inode, *old;
+ struct bch_inode_unpacked inode_u;
+ struct posix_acl *default_acl = NULL, *acl = NULL;
+ subvol_inum inum;
+ struct bch_subvolume subvol;
+ u64 journal_seq = 0;
+ int ret;
+
+ /*
+ * preallocate acls + vfs inode before btree transaction, so that
+ * nothing can fail after the transaction succeeds:
+ */
+#ifdef CONFIG_BCACHEFS_POSIX_ACL
+ ret = posix_acl_create(&dir->v, &mode, &default_acl, &acl);
+ if (ret)
+ return ERR_PTR(ret);
+#endif
+ inode = to_bch_ei(new_inode(c->vfs_sb));
+ if (unlikely(!inode)) {
+ inode = ERR_PTR(-ENOMEM);
+ goto err;
+ }
+
+ bch2_inode_init_early(c, &inode_u);
+
+ if (!(flags & BCH_CREATE_TMPFILE))
+ mutex_lock(&dir->ei_update_lock);
+
+ trans = bch2_trans_get(c);
+retry:
+ bch2_trans_begin(trans);
+
+ ret = bch2_subvol_is_ro_trans(trans, dir->ei_subvol) ?:
+ bch2_create_trans(trans,
+ inode_inum(dir), &dir_u, &inode_u,
+ !(flags & BCH_CREATE_TMPFILE)
+ ? &dentry->d_name : NULL,
+ from_kuid(i_user_ns(&dir->v), current_fsuid()),
+ from_kgid(i_user_ns(&dir->v), current_fsgid()),
+ mode, rdev,
+ default_acl, acl, snapshot_src, flags) ?:
+ bch2_quota_acct(c, bch_qid(&inode_u), Q_INO, 1,
+ KEY_TYPE_QUOTA_PREALLOC);
+ if (unlikely(ret))
+ goto err_before_quota;
+
+ inum.subvol = inode_u.bi_subvol ?: dir->ei_subvol;
+ inum.inum = inode_u.bi_inum;
+
+ ret = bch2_subvolume_get(trans, inum.subvol, true,
+ BTREE_ITER_WITH_UPDATES, &subvol) ?:
+ bch2_trans_commit(trans, NULL, &journal_seq, 0);
+ if (unlikely(ret)) {
+ bch2_quota_acct(c, bch_qid(&inode_u), Q_INO, -1,
+ KEY_TYPE_QUOTA_WARN);
+err_before_quota:
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ goto retry;
+ goto err_trans;
+ }
+
+ if (!(flags & BCH_CREATE_TMPFILE)) {
+ bch2_inode_update_after_write(trans, dir, &dir_u,
+ ATTR_MTIME|ATTR_CTIME);
+ mutex_unlock(&dir->ei_update_lock);
+ }
+
+ bch2_iget5_set(&inode->v, &inum);
+ bch2_vfs_inode_init(trans, inum, inode, &inode_u, &subvol);
+
+ set_cached_acl(&inode->v, ACL_TYPE_ACCESS, acl);
+ set_cached_acl(&inode->v, ACL_TYPE_DEFAULT, default_acl);
+
+ /*
+ * we must insert the new inode into the inode cache before calling
+ * bch2_trans_exit() and dropping locks, else we could race with another
+ * thread pulling the inode in and modifying it:
+ */
+
+ inode->v.i_state |= I_CREATING;
+
+ old = to_bch_ei(inode_insert5(&inode->v,
+ bch2_inode_hash(inum),
+ bch2_iget5_test,
+ bch2_iget5_set,
+ &inum));
+ BUG_ON(!old);
+
+ if (unlikely(old != inode)) {
+ /*
+ * We raced, another process pulled the new inode into cache
+ * before us:
+ */
+ make_bad_inode(&inode->v);
+ iput(&inode->v);
+
+ inode = old;
+ } else {
+ mutex_lock(&c->vfs_inodes_lock);
+ list_add(&inode->ei_vfs_inode_list, &c->vfs_inodes_list);
+ mutex_unlock(&c->vfs_inodes_lock);
+ /*
+ * we really don't want insert_inode_locked2() to be setting
+ * I_NEW...
+ */
+ unlock_new_inode(&inode->v);
+ }
+
+ bch2_trans_put(trans);
+err:
+ posix_acl_release(default_acl);
+ posix_acl_release(acl);
+ return inode;
+err_trans:
+ if (!(flags & BCH_CREATE_TMPFILE))
+ mutex_unlock(&dir->ei_update_lock);
+
+ bch2_trans_put(trans);
+ make_bad_inode(&inode->v);
+ iput(&inode->v);
+ inode = ERR_PTR(ret);
+ goto err;
+}
+
+/* methods */
+
+static struct dentry *bch2_lookup(struct inode *vdir, struct dentry *dentry,
+ unsigned int flags)
+{
+ struct bch_fs *c = vdir->i_sb->s_fs_info;
+ struct bch_inode_info *dir = to_bch_ei(vdir);
+ struct bch_hash_info hash = bch2_hash_info_init(c, &dir->ei_inode);
+ struct inode *vinode = NULL;
+ subvol_inum inum = { .subvol = 1 };
+ int ret;
+
+ ret = bch2_dirent_lookup(c, inode_inum(dir), &hash,
+ &dentry->d_name, &inum);
+
+ if (!ret)
+ vinode = bch2_vfs_inode_get(c, inum);
+
+ return d_splice_alias(vinode, dentry);
+}
+
+static int bch2_mknod(struct mnt_idmap *idmap,
+ struct inode *vdir, struct dentry *dentry,
+ umode_t mode, dev_t rdev)
+{
+ struct bch_inode_info *inode =
+ __bch2_create(idmap, to_bch_ei(vdir), dentry, mode, rdev,
+ (subvol_inum) { 0 }, 0);
+
+ if (IS_ERR(inode))
+ return bch2_err_class(PTR_ERR(inode));
+
+ d_instantiate(dentry, &inode->v);
+ return 0;
+}
+
+static int bch2_create(struct mnt_idmap *idmap,
+ struct inode *vdir, struct dentry *dentry,
+ umode_t mode, bool excl)
+{
+ return bch2_mknod(idmap, vdir, dentry, mode|S_IFREG, 0);
+}
+
+static int __bch2_link(struct bch_fs *c,
+ struct bch_inode_info *inode,
+ struct bch_inode_info *dir,
+ struct dentry *dentry)
+{
+ struct btree_trans *trans = bch2_trans_get(c);
+ struct bch_inode_unpacked dir_u, inode_u;
+ int ret;
+
+ mutex_lock(&inode->ei_update_lock);
+
+ ret = commit_do(trans, NULL, NULL, 0,
+ bch2_link_trans(trans,
+ inode_inum(dir), &dir_u,
+ inode_inum(inode), &inode_u,
+ &dentry->d_name));
+
+ if (likely(!ret)) {
+ bch2_inode_update_after_write(trans, dir, &dir_u,
+ ATTR_MTIME|ATTR_CTIME);
+ bch2_inode_update_after_write(trans, inode, &inode_u, ATTR_CTIME);
+ }
+
+ bch2_trans_put(trans);
+ mutex_unlock(&inode->ei_update_lock);
+ return ret;
+}
+
+static int bch2_link(struct dentry *old_dentry, struct inode *vdir,
+ struct dentry *dentry)
+{
+ struct bch_fs *c = vdir->i_sb->s_fs_info;
+ struct bch_inode_info *dir = to_bch_ei(vdir);
+ struct bch_inode_info *inode = to_bch_ei(old_dentry->d_inode);
+ int ret;
+
+ lockdep_assert_held(&inode->v.i_rwsem);
+
+ ret = bch2_subvol_is_ro(c, dir->ei_subvol) ?:
+ bch2_subvol_is_ro(c, inode->ei_subvol) ?:
+ __bch2_link(c, inode, dir, dentry);
+ if (unlikely(ret))
+ return ret;
+
+ ihold(&inode->v);
+ d_instantiate(dentry, &inode->v);
+ return 0;
+}
+
+int __bch2_unlink(struct inode *vdir, struct dentry *dentry,
+ bool deleting_snapshot)
+{
+ struct bch_fs *c = vdir->i_sb->s_fs_info;
+ struct bch_inode_info *dir = to_bch_ei(vdir);
+ struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
+ struct bch_inode_unpacked dir_u, inode_u;
+ struct btree_trans *trans = bch2_trans_get(c);
+ int ret;
+
+ bch2_lock_inodes(INODE_UPDATE_LOCK, dir, inode);
+
+ ret = commit_do(trans, NULL, NULL,
+ BCH_TRANS_COMMIT_no_enospc,
+ bch2_unlink_trans(trans,
+ inode_inum(dir), &dir_u,
+ &inode_u, &dentry->d_name,
+ deleting_snapshot));
+ if (unlikely(ret))
+ goto err;
+
+ bch2_inode_update_after_write(trans, dir, &dir_u,
+ ATTR_MTIME|ATTR_CTIME);
+ bch2_inode_update_after_write(trans, inode, &inode_u,
+ ATTR_MTIME);
+
+ if (inode_u.bi_subvol) {
+ /*
+ * Subvolume deletion is asynchronous, but we still want to tell
+ * the VFS that it's been deleted here:
+ */
+ set_nlink(&inode->v, 0);
+ }
+err:
+ bch2_unlock_inodes(INODE_UPDATE_LOCK, dir, inode);
+ bch2_trans_put(trans);
+
+ return ret;
+}
+
+static int bch2_unlink(struct inode *vdir, struct dentry *dentry)
+{
+ struct bch_inode_info *dir= to_bch_ei(vdir);
+ struct bch_fs *c = dir->v.i_sb->s_fs_info;
+
+ return bch2_subvol_is_ro(c, dir->ei_subvol) ?:
+ __bch2_unlink(vdir, dentry, false);
+}
+
+static int bch2_symlink(struct mnt_idmap *idmap,
+ struct inode *vdir, struct dentry *dentry,
+ const char *symname)
+{
+ struct bch_fs *c = vdir->i_sb->s_fs_info;
+ struct bch_inode_info *dir = to_bch_ei(vdir), *inode;
+ int ret;
+
+ inode = __bch2_create(idmap, dir, dentry, S_IFLNK|S_IRWXUGO, 0,
+ (subvol_inum) { 0 }, BCH_CREATE_TMPFILE);
+ if (IS_ERR(inode))
+ return bch2_err_class(PTR_ERR(inode));
+
+ inode_lock(&inode->v);
+ ret = page_symlink(&inode->v, symname, strlen(symname) + 1);
+ inode_unlock(&inode->v);
+
+ if (unlikely(ret))
+ goto err;
+
+ ret = filemap_write_and_wait_range(inode->v.i_mapping, 0, LLONG_MAX);
+ if (unlikely(ret))
+ goto err;
+
+ ret = __bch2_link(c, inode, dir, dentry);
+ if (unlikely(ret))
+ goto err;
+
+ d_instantiate(dentry, &inode->v);
+ return 0;
+err:
+ iput(&inode->v);
+ return ret;
+}
+
+static int bch2_mkdir(struct mnt_idmap *idmap,
+ struct inode *vdir, struct dentry *dentry, umode_t mode)
+{
+ return bch2_mknod(idmap, vdir, dentry, mode|S_IFDIR, 0);
+}
+
+static int bch2_rename2(struct mnt_idmap *idmap,
+ struct inode *src_vdir, struct dentry *src_dentry,
+ struct inode *dst_vdir, struct dentry *dst_dentry,
+ unsigned flags)
+{
+ struct bch_fs *c = src_vdir->i_sb->s_fs_info;
+ struct bch_inode_info *src_dir = to_bch_ei(src_vdir);
+ struct bch_inode_info *dst_dir = to_bch_ei(dst_vdir);
+ struct bch_inode_info *src_inode = to_bch_ei(src_dentry->d_inode);
+ struct bch_inode_info *dst_inode = to_bch_ei(dst_dentry->d_inode);
+ struct bch_inode_unpacked dst_dir_u, src_dir_u;
+ struct bch_inode_unpacked src_inode_u, dst_inode_u;
+ struct btree_trans *trans;
+ enum bch_rename_mode mode = flags & RENAME_EXCHANGE
+ ? BCH_RENAME_EXCHANGE
+ : dst_dentry->d_inode
+ ? BCH_RENAME_OVERWRITE : BCH_RENAME;
+ int ret;
+
+ if (flags & ~(RENAME_NOREPLACE|RENAME_EXCHANGE))
+ return -EINVAL;
+
+ if (mode == BCH_RENAME_OVERWRITE) {
+ ret = filemap_write_and_wait_range(src_inode->v.i_mapping,
+ 0, LLONG_MAX);
+ if (ret)
+ return ret;
+ }
+
+ trans = bch2_trans_get(c);
+
+ bch2_lock_inodes(INODE_UPDATE_LOCK,
+ src_dir,
+ dst_dir,
+ src_inode,
+ dst_inode);
+
+ ret = bch2_subvol_is_ro_trans(trans, src_dir->ei_subvol) ?:
+ bch2_subvol_is_ro_trans(trans, dst_dir->ei_subvol);
+ if (ret)
+ goto err;
+
+ if (inode_attr_changing(dst_dir, src_inode, Inode_opt_project)) {
+ ret = bch2_fs_quota_transfer(c, src_inode,
+ dst_dir->ei_qid,
+ 1 << QTYP_PRJ,
+ KEY_TYPE_QUOTA_PREALLOC);
+ if (ret)
+ goto err;
+ }
+
+ if (mode == BCH_RENAME_EXCHANGE &&
+ inode_attr_changing(src_dir, dst_inode, Inode_opt_project)) {
+ ret = bch2_fs_quota_transfer(c, dst_inode,
+ src_dir->ei_qid,
+ 1 << QTYP_PRJ,
+ KEY_TYPE_QUOTA_PREALLOC);
+ if (ret)
+ goto err;
+ }
+
+ ret = commit_do(trans, NULL, NULL, 0,
+ bch2_rename_trans(trans,
+ inode_inum(src_dir), &src_dir_u,
+ inode_inum(dst_dir), &dst_dir_u,
+ &src_inode_u,
+ &dst_inode_u,
+ &src_dentry->d_name,
+ &dst_dentry->d_name,
+ mode));
+ if (unlikely(ret))
+ goto err;
+
+ BUG_ON(src_inode->v.i_ino != src_inode_u.bi_inum);
+ BUG_ON(dst_inode &&
+ dst_inode->v.i_ino != dst_inode_u.bi_inum);
+
+ bch2_inode_update_after_write(trans, src_dir, &src_dir_u,
+ ATTR_MTIME|ATTR_CTIME);
+
+ if (src_dir != dst_dir)
+ bch2_inode_update_after_write(trans, dst_dir, &dst_dir_u,
+ ATTR_MTIME|ATTR_CTIME);
+
+ bch2_inode_update_after_write(trans, src_inode, &src_inode_u,
+ ATTR_CTIME);
+
+ if (dst_inode)
+ bch2_inode_update_after_write(trans, dst_inode, &dst_inode_u,
+ ATTR_CTIME);
+err:
+ bch2_trans_put(trans);
+
+ bch2_fs_quota_transfer(c, src_inode,
+ bch_qid(&src_inode->ei_inode),
+ 1 << QTYP_PRJ,
+ KEY_TYPE_QUOTA_NOCHECK);
+ if (dst_inode)
+ bch2_fs_quota_transfer(c, dst_inode,
+ bch_qid(&dst_inode->ei_inode),
+ 1 << QTYP_PRJ,
+ KEY_TYPE_QUOTA_NOCHECK);
+
+ bch2_unlock_inodes(INODE_UPDATE_LOCK,
+ src_dir,
+ dst_dir,
+ src_inode,
+ dst_inode);
+
+ return ret;
+}
+
+static void bch2_setattr_copy(struct mnt_idmap *idmap,
+ struct bch_inode_info *inode,
+ struct bch_inode_unpacked *bi,
+ struct iattr *attr)
+{
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ unsigned int ia_valid = attr->ia_valid;
+
+ if (ia_valid & ATTR_UID)
+ bi->bi_uid = from_kuid(i_user_ns(&inode->v), attr->ia_uid);
+ if (ia_valid & ATTR_GID)
+ bi->bi_gid = from_kgid(i_user_ns(&inode->v), attr->ia_gid);
+
+ if (ia_valid & ATTR_SIZE)
+ bi->bi_size = attr->ia_size;
+
+ if (ia_valid & ATTR_ATIME)
+ bi->bi_atime = timespec_to_bch2_time(c, attr->ia_atime);
+ if (ia_valid & ATTR_MTIME)
+ bi->bi_mtime = timespec_to_bch2_time(c, attr->ia_mtime);
+ if (ia_valid & ATTR_CTIME)
+ bi->bi_ctime = timespec_to_bch2_time(c, attr->ia_ctime);
+
+ if (ia_valid & ATTR_MODE) {
+ umode_t mode = attr->ia_mode;
+ kgid_t gid = ia_valid & ATTR_GID
+ ? attr->ia_gid
+ : inode->v.i_gid;
+
+ if (!in_group_p(gid) &&
+ !capable_wrt_inode_uidgid(idmap, &inode->v, CAP_FSETID))
+ mode &= ~S_ISGID;
+ bi->bi_mode = mode;
+ }
+}
+
+int bch2_setattr_nonsize(struct mnt_idmap *idmap,
+ struct bch_inode_info *inode,
+ struct iattr *attr)
+{
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ struct bch_qid qid;
+ struct btree_trans *trans;
+ struct btree_iter inode_iter = { NULL };
+ struct bch_inode_unpacked inode_u;
+ struct posix_acl *acl = NULL;
+ int ret;
+
+ mutex_lock(&inode->ei_update_lock);
+
+ qid = inode->ei_qid;
+
+ if (attr->ia_valid & ATTR_UID)
+ qid.q[QTYP_USR] = from_kuid(i_user_ns(&inode->v), attr->ia_uid);
+
+ if (attr->ia_valid & ATTR_GID)
+ qid.q[QTYP_GRP] = from_kgid(i_user_ns(&inode->v), attr->ia_gid);
+
+ ret = bch2_fs_quota_transfer(c, inode, qid, ~0,
+ KEY_TYPE_QUOTA_PREALLOC);
+ if (ret)
+ goto err;
+
+ trans = bch2_trans_get(c);
+retry:
+ bch2_trans_begin(trans);
+ kfree(acl);
+ acl = NULL;
+
+ ret = bch2_inode_peek(trans, &inode_iter, &inode_u, inode_inum(inode),
+ BTREE_ITER_INTENT);
+ if (ret)
+ goto btree_err;
+
+ bch2_setattr_copy(idmap, inode, &inode_u, attr);
+
+ if (attr->ia_valid & ATTR_MODE) {
+ ret = bch2_acl_chmod(trans, inode_inum(inode), &inode_u,
+ inode_u.bi_mode, &acl);
+ if (ret)
+ goto btree_err;
+ }
+
+ ret = bch2_inode_write(trans, &inode_iter, &inode_u) ?:
+ bch2_trans_commit(trans, NULL, NULL,
+ BCH_TRANS_COMMIT_no_enospc);
+btree_err:
+ bch2_trans_iter_exit(trans, &inode_iter);
+
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ goto retry;
+ if (unlikely(ret))
+ goto err_trans;
+
+ bch2_inode_update_after_write(trans, inode, &inode_u, attr->ia_valid);
+
+ if (acl)
+ set_cached_acl(&inode->v, ACL_TYPE_ACCESS, acl);
+err_trans:
+ bch2_trans_put(trans);
+err:
+ mutex_unlock(&inode->ei_update_lock);
+
+ return bch2_err_class(ret);
+}
+
+static int bch2_getattr(struct mnt_idmap *idmap,
+ const struct path *path, struct kstat *stat,
+ u32 request_mask, unsigned query_flags)
+{
+ struct bch_inode_info *inode = to_bch_ei(d_inode(path->dentry));
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+
+ stat->dev = inode->v.i_sb->s_dev;
+ stat->ino = inode->v.i_ino;
+ stat->mode = inode->v.i_mode;
+ stat->nlink = inode->v.i_nlink;
+ stat->uid = inode->v.i_uid;
+ stat->gid = inode->v.i_gid;
+ stat->rdev = inode->v.i_rdev;
+ stat->size = i_size_read(&inode->v);
+ stat->atime = inode_get_atime(&inode->v);
+ stat->mtime = inode_get_mtime(&inode->v);
+ stat->ctime = inode_get_ctime(&inode->v);
+ stat->blksize = block_bytes(c);
+ stat->blocks = inode->v.i_blocks;
+
+ if (request_mask & STATX_BTIME) {
+ stat->result_mask |= STATX_BTIME;
+ stat->btime = bch2_time_to_timespec(c, inode->ei_inode.bi_otime);
+ }
+
+ if (inode->ei_inode.bi_flags & BCH_INODE_immutable)
+ stat->attributes |= STATX_ATTR_IMMUTABLE;
+ stat->attributes_mask |= STATX_ATTR_IMMUTABLE;
+
+ if (inode->ei_inode.bi_flags & BCH_INODE_append)
+ stat->attributes |= STATX_ATTR_APPEND;
+ stat->attributes_mask |= STATX_ATTR_APPEND;
+
+ if (inode->ei_inode.bi_flags & BCH_INODE_nodump)
+ stat->attributes |= STATX_ATTR_NODUMP;
+ stat->attributes_mask |= STATX_ATTR_NODUMP;
+
+ return 0;
+}
+
+static int bch2_setattr(struct mnt_idmap *idmap,
+ struct dentry *dentry, struct iattr *iattr)
+{
+ struct bch_inode_info *inode = to_bch_ei(dentry->d_inode);
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ int ret;
+
+ lockdep_assert_held(&inode->v.i_rwsem);
+
+ ret = bch2_subvol_is_ro(c, inode->ei_subvol) ?:
+ setattr_prepare(idmap, dentry, iattr);
+ if (ret)
+ return ret;
+
+ return iattr->ia_valid & ATTR_SIZE
+ ? bchfs_truncate(idmap, inode, iattr)
+ : bch2_setattr_nonsize(idmap, inode, iattr);
+}
+
+static int bch2_tmpfile(struct mnt_idmap *idmap,
+ struct inode *vdir, struct file *file, umode_t mode)
+{
+ struct bch_inode_info *inode =
+ __bch2_create(idmap, to_bch_ei(vdir),
+ file->f_path.dentry, mode, 0,
+ (subvol_inum) { 0 }, BCH_CREATE_TMPFILE);
+
+ if (IS_ERR(inode))
+ return bch2_err_class(PTR_ERR(inode));
+
+ d_mark_tmpfile(file, &inode->v);
+ d_instantiate(file->f_path.dentry, &inode->v);
+ return finish_open_simple(file, 0);
+}
+
+static int bch2_fill_extent(struct bch_fs *c,
+ struct fiemap_extent_info *info,
+ struct bkey_s_c k, unsigned flags)
+{
+ if (bkey_extent_is_direct_data(k.k)) {
+ struct bkey_ptrs_c ptrs = bch2_bkey_ptrs_c(k);
+ const union bch_extent_entry *entry;
+ struct extent_ptr_decoded p;
+ int ret;
+
+ if (k.k->type == KEY_TYPE_reflink_v)
+ flags |= FIEMAP_EXTENT_SHARED;
+
+ bkey_for_each_ptr_decode(k.k, ptrs, p, entry) {
+ int flags2 = 0;
+ u64 offset = p.ptr.offset;
+
+ if (p.ptr.unwritten)
+ flags2 |= FIEMAP_EXTENT_UNWRITTEN;
+
+ if (p.crc.compression_type)
+ flags2 |= FIEMAP_EXTENT_ENCODED;
+ else
+ offset += p.crc.offset;
+
+ if ((offset & (block_sectors(c) - 1)) ||
+ (k.k->size & (block_sectors(c) - 1)))
+ flags2 |= FIEMAP_EXTENT_NOT_ALIGNED;
+
+ ret = fiemap_fill_next_extent(info,
+ bkey_start_offset(k.k) << 9,
+ offset << 9,
+ k.k->size << 9, flags|flags2);
+ if (ret)
+ return ret;
+ }
+
+ return 0;
+ } else if (bkey_extent_is_inline_data(k.k)) {
+ return fiemap_fill_next_extent(info,
+ bkey_start_offset(k.k) << 9,
+ 0, k.k->size << 9,
+ flags|
+ FIEMAP_EXTENT_DATA_INLINE);
+ } else if (k.k->type == KEY_TYPE_reservation) {
+ return fiemap_fill_next_extent(info,
+ bkey_start_offset(k.k) << 9,
+ 0, k.k->size << 9,
+ flags|
+ FIEMAP_EXTENT_DELALLOC|
+ FIEMAP_EXTENT_UNWRITTEN);
+ } else {
+ BUG();
+ }
+}
+
+static int bch2_fiemap(struct inode *vinode, struct fiemap_extent_info *info,
+ u64 start, u64 len)
+{
+ struct bch_fs *c = vinode->i_sb->s_fs_info;
+ struct bch_inode_info *ei = to_bch_ei(vinode);
+ struct btree_trans *trans;
+ struct btree_iter iter;
+ struct bkey_s_c k;
+ struct bkey_buf cur, prev;
+ struct bpos end = POS(ei->v.i_ino, (start + len) >> 9);
+ unsigned offset_into_extent, sectors;
+ bool have_extent = false;
+ u32 snapshot;
+ int ret = 0;
+
+ ret = fiemap_prep(&ei->v, info, start, &len, FIEMAP_FLAG_SYNC);
+ if (ret)
+ return ret;
+
+ if (start + len < start)
+ return -EINVAL;
+
+ start >>= 9;
+
+ bch2_bkey_buf_init(&cur);
+ bch2_bkey_buf_init(&prev);
+ trans = bch2_trans_get(c);
+retry:
+ bch2_trans_begin(trans);
+
+ ret = bch2_subvolume_get_snapshot(trans, ei->ei_subvol, &snapshot);
+ if (ret)
+ goto err;
+
+ bch2_trans_iter_init(trans, &iter, BTREE_ID_extents,
+ SPOS(ei->v.i_ino, start, snapshot), 0);
+
+ while (!(ret = btree_trans_too_many_iters(trans)) &&
+ (k = bch2_btree_iter_peek_upto(&iter, end)).k &&
+ !(ret = bkey_err(k))) {
+ enum btree_id data_btree = BTREE_ID_extents;
+
+ if (!bkey_extent_is_data(k.k) &&
+ k.k->type != KEY_TYPE_reservation) {
+ bch2_btree_iter_advance(&iter);
+ continue;
+ }
+
+ offset_into_extent = iter.pos.offset -
+ bkey_start_offset(k.k);
+ sectors = k.k->size - offset_into_extent;
+
+ bch2_bkey_buf_reassemble(&cur, c, k);
+
+ ret = bch2_read_indirect_extent(trans, &data_btree,
+ &offset_into_extent, &cur);
+ if (ret)
+ break;
+
+ k = bkey_i_to_s_c(cur.k);
+ bch2_bkey_buf_realloc(&prev, c, k.k->u64s);
+
+ sectors = min(sectors, k.k->size - offset_into_extent);
+
+ bch2_cut_front(POS(k.k->p.inode,
+ bkey_start_offset(k.k) +
+ offset_into_extent),
+ cur.k);
+ bch2_key_resize(&cur.k->k, sectors);
+ cur.k->k.p = iter.pos;
+ cur.k->k.p.offset += cur.k->k.size;
+
+ if (have_extent) {
+ bch2_trans_unlock(trans);
+ ret = bch2_fill_extent(c, info,
+ bkey_i_to_s_c(prev.k), 0);
+ if (ret)
+ break;
+ }
+
+ bkey_copy(prev.k, cur.k);
+ have_extent = true;
+
+ bch2_btree_iter_set_pos(&iter,
+ POS(iter.pos.inode, iter.pos.offset + sectors));
+ }
+ start = iter.pos.offset;
+ bch2_trans_iter_exit(trans, &iter);
+err:
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ goto retry;
+
+ if (!ret && have_extent) {
+ bch2_trans_unlock(trans);
+ ret = bch2_fill_extent(c, info, bkey_i_to_s_c(prev.k),
+ FIEMAP_EXTENT_LAST);
+ }
+
+ bch2_trans_put(trans);
+ bch2_bkey_buf_exit(&cur, c);
+ bch2_bkey_buf_exit(&prev, c);
+ return ret < 0 ? ret : 0;
+}
+
+static const struct vm_operations_struct bch_vm_ops = {
+ .fault = bch2_page_fault,
+ .map_pages = filemap_map_pages,
+ .page_mkwrite = bch2_page_mkwrite,
+};
+
+static int bch2_mmap(struct file *file, struct vm_area_struct *vma)
+{
+ file_accessed(file);
+
+ vma->vm_ops = &bch_vm_ops;
+ return 0;
+}
+
+/* Directories: */
+
+static loff_t bch2_dir_llseek(struct file *file, loff_t offset, int whence)
+{
+ return generic_file_llseek_size(file, offset, whence,
+ S64_MAX, S64_MAX);
+}
+
+static int bch2_vfs_readdir(struct file *file, struct dir_context *ctx)
+{
+ struct bch_inode_info *inode = file_bch_inode(file);
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+
+ if (!dir_emit_dots(file, ctx))
+ return 0;
+
+ int ret = bch2_readdir(c, inode_inum(inode), ctx);
+
+ bch_err_fn(c, ret);
+ return bch2_err_class(ret);
+}
+
+static int bch2_open(struct inode *vinode, struct file *file)
+{
+ if (file->f_flags & (O_WRONLY|O_RDWR)) {
+ struct bch_inode_info *inode = to_bch_ei(vinode);
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+
+ int ret = bch2_subvol_is_ro(c, inode->ei_subvol);
+ if (ret)
+ return ret;
+ }
+
+ return generic_file_open(vinode, file);
+}
+
+static const struct file_operations bch_file_operations = {
+ .open = bch2_open,
+ .llseek = bch2_llseek,
+ .read_iter = bch2_read_iter,
+ .write_iter = bch2_write_iter,
+ .mmap = bch2_mmap,
+ .fsync = bch2_fsync,
+ .splice_read = filemap_splice_read,
+ .splice_write = iter_file_splice_write,
+ .fallocate = bch2_fallocate_dispatch,
+ .unlocked_ioctl = bch2_fs_file_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = bch2_compat_fs_ioctl,
+#endif
+ .remap_file_range = bch2_remap_file_range,
+};
+
+static const struct inode_operations bch_file_inode_operations = {
+ .getattr = bch2_getattr,
+ .setattr = bch2_setattr,
+ .fiemap = bch2_fiemap,
+ .listxattr = bch2_xattr_list,
+#ifdef CONFIG_BCACHEFS_POSIX_ACL
+ .get_acl = bch2_get_acl,
+ .set_acl = bch2_set_acl,
+#endif
+};
+
+static const struct inode_operations bch_dir_inode_operations = {
+ .lookup = bch2_lookup,
+ .create = bch2_create,
+ .link = bch2_link,
+ .unlink = bch2_unlink,
+ .symlink = bch2_symlink,
+ .mkdir = bch2_mkdir,
+ .rmdir = bch2_unlink,
+ .mknod = bch2_mknod,
+ .rename = bch2_rename2,
+ .getattr = bch2_getattr,
+ .setattr = bch2_setattr,
+ .tmpfile = bch2_tmpfile,
+ .listxattr = bch2_xattr_list,
+#ifdef CONFIG_BCACHEFS_POSIX_ACL
+ .get_acl = bch2_get_acl,
+ .set_acl = bch2_set_acl,
+#endif
+};
+
+static const struct file_operations bch_dir_file_operations = {
+ .llseek = bch2_dir_llseek,
+ .read = generic_read_dir,
+ .iterate_shared = bch2_vfs_readdir,
+ .fsync = bch2_fsync,
+ .unlocked_ioctl = bch2_fs_file_ioctl,
+#ifdef CONFIG_COMPAT
+ .compat_ioctl = bch2_compat_fs_ioctl,
+#endif
+};
+
+static const struct inode_operations bch_symlink_inode_operations = {
+ .get_link = page_get_link,
+ .getattr = bch2_getattr,
+ .setattr = bch2_setattr,
+ .listxattr = bch2_xattr_list,
+#ifdef CONFIG_BCACHEFS_POSIX_ACL
+ .get_acl = bch2_get_acl,
+ .set_acl = bch2_set_acl,
+#endif
+};
+
+static const struct inode_operations bch_special_inode_operations = {
+ .getattr = bch2_getattr,
+ .setattr = bch2_setattr,
+ .listxattr = bch2_xattr_list,
+#ifdef CONFIG_BCACHEFS_POSIX_ACL
+ .get_acl = bch2_get_acl,
+ .set_acl = bch2_set_acl,
+#endif
+};
+
+static const struct address_space_operations bch_address_space_operations = {
+ .read_folio = bch2_read_folio,
+ .writepages = bch2_writepages,
+ .readahead = bch2_readahead,
+ .dirty_folio = filemap_dirty_folio,
+ .write_begin = bch2_write_begin,
+ .write_end = bch2_write_end,
+ .invalidate_folio = bch2_invalidate_folio,
+ .release_folio = bch2_release_folio,
+ .direct_IO = noop_direct_IO,
+#ifdef CONFIG_MIGRATION
+ .migrate_folio = filemap_migrate_folio,
+#endif
+ .error_remove_page = generic_error_remove_page,
+};
+
+struct bcachefs_fid {
+ u64 inum;
+ u32 subvol;
+ u32 gen;
+} __packed;
+
+struct bcachefs_fid_with_parent {
+ struct bcachefs_fid fid;
+ struct bcachefs_fid dir;
+} __packed;
+
+static int bcachefs_fid_valid(int fh_len, int fh_type)
+{
+ switch (fh_type) {
+ case FILEID_BCACHEFS_WITHOUT_PARENT:
+ return fh_len == sizeof(struct bcachefs_fid) / sizeof(u32);
+ case FILEID_BCACHEFS_WITH_PARENT:
+ return fh_len == sizeof(struct bcachefs_fid_with_parent) / sizeof(u32);
+ default:
+ return false;
+ }
+}
+
+static struct bcachefs_fid bch2_inode_to_fid(struct bch_inode_info *inode)
+{
+ return (struct bcachefs_fid) {
+ .inum = inode->ei_inode.bi_inum,
+ .subvol = inode->ei_subvol,
+ .gen = inode->ei_inode.bi_generation,
+ };
+}
+
+static int bch2_encode_fh(struct inode *vinode, u32 *fh, int *len,
+ struct inode *vdir)
+{
+ struct bch_inode_info *inode = to_bch_ei(vinode);
+ struct bch_inode_info *dir = to_bch_ei(vdir);
+ int min_len;
+
+ if (!S_ISDIR(inode->v.i_mode) && dir) {
+ struct bcachefs_fid_with_parent *fid = (void *) fh;
+
+ min_len = sizeof(*fid) / sizeof(u32);
+ if (*len < min_len) {
+ *len = min_len;
+ return FILEID_INVALID;
+ }
+
+ fid->fid = bch2_inode_to_fid(inode);
+ fid->dir = bch2_inode_to_fid(dir);
+
+ *len = min_len;
+ return FILEID_BCACHEFS_WITH_PARENT;
+ } else {
+ struct bcachefs_fid *fid = (void *) fh;
+
+ min_len = sizeof(*fid) / sizeof(u32);
+ if (*len < min_len) {
+ *len = min_len;
+ return FILEID_INVALID;
+ }
+ *fid = bch2_inode_to_fid(inode);
+
+ *len = min_len;
+ return FILEID_BCACHEFS_WITHOUT_PARENT;
+ }
+}
+
+static struct inode *bch2_nfs_get_inode(struct super_block *sb,
+ struct bcachefs_fid fid)
+{
+ struct bch_fs *c = sb->s_fs_info;
+ struct inode *vinode = bch2_vfs_inode_get(c, (subvol_inum) {
+ .subvol = fid.subvol,
+ .inum = fid.inum,
+ });
+ if (!IS_ERR(vinode) && vinode->i_generation != fid.gen) {
+ iput(vinode);
+ vinode = ERR_PTR(-ESTALE);
+ }
+ return vinode;
+}
+
+static struct dentry *bch2_fh_to_dentry(struct super_block *sb, struct fid *_fid,
+ int fh_len, int fh_type)
+{
+ struct bcachefs_fid *fid = (void *) _fid;
+
+ if (!bcachefs_fid_valid(fh_len, fh_type))
+ return NULL;
+
+ return d_obtain_alias(bch2_nfs_get_inode(sb, *fid));
+}
+
+static struct dentry *bch2_fh_to_parent(struct super_block *sb, struct fid *_fid,
+ int fh_len, int fh_type)
+{
+ struct bcachefs_fid_with_parent *fid = (void *) _fid;
+
+ if (!bcachefs_fid_valid(fh_len, fh_type) ||
+ fh_type != FILEID_BCACHEFS_WITH_PARENT)
+ return NULL;
+
+ return d_obtain_alias(bch2_nfs_get_inode(sb, fid->dir));
+}
+
+static struct dentry *bch2_get_parent(struct dentry *child)
+{
+ struct bch_inode_info *inode = to_bch_ei(child->d_inode);
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ subvol_inum parent_inum = {
+ .subvol = inode->ei_inode.bi_parent_subvol ?:
+ inode->ei_subvol,
+ .inum = inode->ei_inode.bi_dir,
+ };
+
+ return d_obtain_alias(bch2_vfs_inode_get(c, parent_inum));
+}
+
+static int bch2_get_name(struct dentry *parent, char *name, struct dentry *child)
+{
+ struct bch_inode_info *inode = to_bch_ei(child->d_inode);
+ struct bch_inode_info *dir = to_bch_ei(parent->d_inode);
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+ struct btree_trans *trans;
+ struct btree_iter iter1;
+ struct btree_iter iter2;
+ struct bkey_s_c k;
+ struct bkey_s_c_dirent d;
+ struct bch_inode_unpacked inode_u;
+ subvol_inum target;
+ u32 snapshot;
+ struct qstr dirent_name;
+ unsigned name_len = 0;
+ int ret;
+
+ if (!S_ISDIR(dir->v.i_mode))
+ return -EINVAL;
+
+ trans = bch2_trans_get(c);
+
+ bch2_trans_iter_init(trans, &iter1, BTREE_ID_dirents,
+ POS(dir->ei_inode.bi_inum, 0), 0);
+ bch2_trans_iter_init(trans, &iter2, BTREE_ID_dirents,
+ POS(dir->ei_inode.bi_inum, 0), 0);
+retry:
+ bch2_trans_begin(trans);
+
+ ret = bch2_subvolume_get_snapshot(trans, dir->ei_subvol, &snapshot);
+ if (ret)
+ goto err;
+
+ bch2_btree_iter_set_snapshot(&iter1, snapshot);
+ bch2_btree_iter_set_snapshot(&iter2, snapshot);
+
+ ret = bch2_inode_find_by_inum_trans(trans, inode_inum(inode), &inode_u);
+ if (ret)
+ goto err;
+
+ if (inode_u.bi_dir == dir->ei_inode.bi_inum) {
+ bch2_btree_iter_set_pos(&iter1, POS(inode_u.bi_dir, inode_u.bi_dir_offset));
+
+ k = bch2_btree_iter_peek_slot(&iter1);
+ ret = bkey_err(k);
+ if (ret)
+ goto err;
+
+ if (k.k->type != KEY_TYPE_dirent) {
+ ret = -BCH_ERR_ENOENT_dirent_doesnt_match_inode;
+ goto err;
+ }
+
+ d = bkey_s_c_to_dirent(k);
+ ret = bch2_dirent_read_target(trans, inode_inum(dir), d, &target);
+ if (ret > 0)
+ ret = -BCH_ERR_ENOENT_dirent_doesnt_match_inode;
+ if (ret)
+ goto err;
+
+ if (target.subvol == inode->ei_subvol &&
+ target.inum == inode->ei_inode.bi_inum)
+ goto found;
+ } else {
+ /*
+ * File with multiple hardlinks and our backref is to the wrong
+ * directory - linear search:
+ */
+ for_each_btree_key_continue_norestart(iter2, 0, k, ret) {
+ if (k.k->p.inode > dir->ei_inode.bi_inum)
+ break;
+
+ if (k.k->type != KEY_TYPE_dirent)
+ continue;
+
+ d = bkey_s_c_to_dirent(k);
+ ret = bch2_dirent_read_target(trans, inode_inum(dir), d, &target);
+ if (ret < 0)
+ break;
+ if (ret)
+ continue;
+
+ if (target.subvol == inode->ei_subvol &&
+ target.inum == inode->ei_inode.bi_inum)
+ goto found;
+ }
+ }
+
+ ret = -ENOENT;
+ goto err;
+found:
+ dirent_name = bch2_dirent_get_name(d);
+
+ name_len = min_t(unsigned, dirent_name.len, NAME_MAX);
+ memcpy(name, dirent_name.name, name_len);
+ name[name_len] = '\0';
+err:
+ if (bch2_err_matches(ret, BCH_ERR_transaction_restart))
+ goto retry;
+
+ bch2_trans_iter_exit(trans, &iter1);
+ bch2_trans_iter_exit(trans, &iter2);
+ bch2_trans_put(trans);
+
+ return ret;
+}
+
+static const struct export_operations bch_export_ops = {
+ .encode_fh = bch2_encode_fh,
+ .fh_to_dentry = bch2_fh_to_dentry,
+ .fh_to_parent = bch2_fh_to_parent,
+ .get_parent = bch2_get_parent,
+ .get_name = bch2_get_name,
+};
+
+static void bch2_vfs_inode_init(struct btree_trans *trans, subvol_inum inum,
+ struct bch_inode_info *inode,
+ struct bch_inode_unpacked *bi,
+ struct bch_subvolume *subvol)
+{
+ bch2_inode_update_after_write(trans, inode, bi, ~0);
+
+ if (BCH_SUBVOLUME_SNAP(subvol))
+ set_bit(EI_INODE_SNAPSHOT, &inode->ei_flags);
+ else
+ clear_bit(EI_INODE_SNAPSHOT, &inode->ei_flags);
+
+ inode->v.i_blocks = bi->bi_sectors;
+ inode->v.i_ino = bi->bi_inum;
+ inode->v.i_rdev = bi->bi_dev;
+ inode->v.i_generation = bi->bi_generation;
+ inode->v.i_size = bi->bi_size;
+
+ inode->ei_flags = 0;
+ inode->ei_quota_reserved = 0;
+ inode->ei_qid = bch_qid(bi);
+ inode->ei_subvol = inum.subvol;
+
+ inode->v.i_mapping->a_ops = &bch_address_space_operations;
+
+ switch (inode->v.i_mode & S_IFMT) {
+ case S_IFREG:
+ inode->v.i_op = &bch_file_inode_operations;
+ inode->v.i_fop = &bch_file_operations;
+ break;
+ case S_IFDIR:
+ inode->v.i_op = &bch_dir_inode_operations;
+ inode->v.i_fop = &bch_dir_file_operations;
+ break;
+ case S_IFLNK:
+ inode_nohighmem(&inode->v);
+ inode->v.i_op = &bch_symlink_inode_operations;
+ break;
+ default:
+ init_special_inode(&inode->v, inode->v.i_mode, inode->v.i_rdev);
+ inode->v.i_op = &bch_special_inode_operations;
+ break;
+ }
+
+ mapping_set_large_folios(inode->v.i_mapping);
+}
+
+static struct inode *bch2_alloc_inode(struct super_block *sb)
+{
+ struct bch_inode_info *inode;
+
+ inode = kmem_cache_alloc(bch2_inode_cache, GFP_NOFS);
+ if (!inode)
+ return NULL;
+
+ inode_init_once(&inode->v);
+ mutex_init(&inode->ei_update_lock);
+ two_state_lock_init(&inode->ei_pagecache_lock);
+ INIT_LIST_HEAD(&inode->ei_vfs_inode_list);
+ mutex_init(&inode->ei_quota_lock);
+
+ return &inode->v;
+}
+
+static void bch2_i_callback(struct rcu_head *head)
+{
+ struct inode *vinode = container_of(head, struct inode, i_rcu);
+ struct bch_inode_info *inode = to_bch_ei(vinode);
+
+ kmem_cache_free(bch2_inode_cache, inode);
+}
+
+static void bch2_destroy_inode(struct inode *vinode)
+{
+ call_rcu(&vinode->i_rcu, bch2_i_callback);
+}
+
+static int inode_update_times_fn(struct btree_trans *trans,
+ struct bch_inode_info *inode,
+ struct bch_inode_unpacked *bi,
+ void *p)
+{
+ struct bch_fs *c = inode->v.i_sb->s_fs_info;
+
+ bi->bi_atime = timespec_to_bch2_time(c, inode_get_atime(&inode->v));
+ bi->bi_mtime = timespec_to_bch2_time(c, inode_get_mtime(&inode->v));
+ bi->bi_ctime = timespec_to_bch2_time(c, inode_get_ctime(&inode->v));
+
+ return 0;
+}
+
+static int bch2_vfs_write_inode(struct inode *vinode,
+ struct writeback_control *wbc)
+{
+ struct bch_fs *c = vinode->i_sb->s_fs_info;
+ struct bch_inode_info *inode = to_bch_ei(vinode);
+ int ret;
+
+ mutex_lock(&inode->ei_update_lock);
+ ret = bch2_write_inode(c, inode, inode_update_times_fn, NULL,
+ ATTR_ATIME|ATTR_MTIME|ATTR_CTIME);
+ mutex_unlock(&inode->ei_update_lock);
+
+ return bch2_err_class(ret);
+}
+
+static void bch2_evict_inode(struct inode *vinode)
+{
+ struct bch_fs *c = vinode->i_sb->s_fs_info;
+ struct bch_inode_info *inode = to_bch_ei(vinode);
+
+ truncate_inode_pages_final(&inode->v.i_data);
+
+ clear_inode(&inode->v);
+
+ BUG_ON(!is_bad_inode(&inode->v) && inode->ei_quota_reserved);
+
+ if (!inode->v.i_nlink && !is_bad_inode(&inode->v)) {
+ bch2_quota_acct(c, inode->ei_qid, Q_SPC, -((s64) inode->v.i_blocks),
+ KEY_TYPE_QUOTA_WARN);
+ bch2_quota_acct(c, inode->ei_qid, Q_INO, -1,
+ KEY_TYPE_QUOTA_WARN);
+ bch2_inode_rm(c, inode_inum(inode));
+ }
+
+ mutex_lock(&c->vfs_inodes_lock);
+ list_del_init(&inode->ei_vfs_inode_list);
+ mutex_unlock(&c->vfs_inodes_lock);
+}
+
+void bch2_evict_subvolume_inodes(struct bch_fs *c, snapshot_id_list *s)
+{
+ struct bch_inode_info *inode;
+ DARRAY(struct bch_inode_info *) grabbed;
+ bool clean_pass = false, this_pass_clean;
+
+ /*
+ * Initially, we scan for inodes without I_DONTCACHE, then mark them to
+ * be pruned with d_mark_dontcache().
+ *
+ * Once we've had a clean pass where we didn't find any inodes without
+ * I_DONTCACHE, we wait for them to be freed:
+ */
+
+ darray_init(&grabbed);
+ darray_make_room(&grabbed, 1024);
+again:
+ cond_resched();
+ this_pass_clean = true;
+
+ mutex_lock(&c->vfs_inodes_lock);
+ list_for_each_entry(inode, &c->vfs_inodes_list, ei_vfs_inode_list) {
+ if (!snapshot_list_has_id(s, inode->ei_subvol))
+ continue;
+
+ if (!(inode->v.i_state & I_DONTCACHE) &&
+ !(inode->v.i_state & I_FREEING) &&
+ igrab(&inode->v)) {
+ this_pass_clean = false;
+
+ if (darray_push_gfp(&grabbed, inode, GFP_ATOMIC|__GFP_NOWARN)) {
+ iput(&inode->v);
+ break;
+ }
+ } else if (clean_pass && this_pass_clean) {
+ wait_queue_head_t *wq = bit_waitqueue(&inode->v.i_state, __I_NEW);
+ DEFINE_WAIT_BIT(wait, &inode->v.i_state, __I_NEW);
+
+ prepare_to_wait(wq, &wait.wq_entry, TASK_UNINTERRUPTIBLE);
+ mutex_unlock(&c->vfs_inodes_lock);
+
+ schedule();
+ finish_wait(wq, &wait.wq_entry);
+ goto again;
+ }
+ }
+ mutex_unlock(&c->vfs_inodes_lock);
+
+ darray_for_each(grabbed, i) {
+ inode = *i;
+ d_mark_dontcache(&inode->v);
+ d_prune_aliases(&inode->v);
+ iput(&inode->v);
+ }
+ grabbed.nr = 0;
+
+ if (!clean_pass || !this_pass_clean) {
+ clean_pass = this_pass_clean;
+ goto again;
+ }
+
+ darray_exit(&grabbed);
+}
+
+static int bch2_statfs(struct dentry *dentry, struct kstatfs *buf)
+{
+ struct super_block *sb = dentry->d_sb;
+ struct bch_fs *c = sb->s_fs_info;
+ struct bch_fs_usage_short usage = bch2_fs_usage_read_short(c);
+ unsigned shift = sb->s_blocksize_bits - 9;
+ /*
+ * this assumes inodes take up 64 bytes, which is a decent average
+ * number:
+ */
+ u64 avail_inodes = ((usage.capacity - usage.used) << 3);
+ u64 fsid;
+
+ buf->f_type = BCACHEFS_STATFS_MAGIC;
+ buf->f_bsize = sb->s_blocksize;
+ buf->f_blocks = usage.capacity >> shift;
+ buf->f_bfree = usage.free >> shift;
+ buf->f_bavail = avail_factor(usage.free) >> shift;
+
+ buf->f_files = usage.nr_inodes + avail_inodes;
+ buf->f_ffree = avail_inodes;
+
+ fsid = le64_to_cpup((void *) c->sb.user_uuid.b) ^
+ le64_to_cpup((void *) c->sb.user_uuid.b + sizeof(u64));
+ buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
+ buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
+ buf->f_namelen = BCH_NAME_MAX;
+
+ return 0;
+}
+
+static int bch2_sync_fs(struct super_block *sb, int wait)
+{
+ struct bch_fs *c = sb->s_fs_info;
+ int ret;
+
+ if (c->opts.journal_flush_disabled)
+ return 0;
+
+ if (!wait) {
+ bch2_journal_flush_async(&c->journal, NULL);
+ return 0;
+ }
+
+ ret = bch2_journal_flush(&c->journal);
+ return bch2_err_class(ret);
+}
+
+static struct bch_fs *bch2_path_to_fs(const char *path)
+{
+ struct bch_fs *c;
+ dev_t dev;
+ int ret;
+
+ ret = lookup_bdev(path, &dev);
+ if (ret)
+ return ERR_PTR(ret);
+
+ c = bch2_dev_to_fs(dev);
+ if (c)
+ closure_put(&c->cl);
+ return c ?: ERR_PTR(-ENOENT);
+}
+
+static int bch2_remount(struct super_block *sb, int *flags, char *data)
+{
+ struct bch_fs *c = sb->s_fs_info;
+ struct bch_opts opts = bch2_opts_empty();
+ int ret;
+
+ ret = bch2_parse_mount_opts(c, &opts, data);
+ if (ret)
+ goto err;
+
+ opt_set(opts, read_only, (*flags & SB_RDONLY) != 0);
+
+ if (opts.read_only != c->opts.read_only) {
+ down_write(&c->state_lock);
+
+ if (opts.read_only) {
+ bch2_fs_read_only(c);
+
+ sb->s_flags |= SB_RDONLY;
+ } else {
+ ret = bch2_fs_read_write(c);
+ if (ret) {
+ bch_err(c, "error going rw: %i", ret);
+ up_write(&c->state_lock);
+ ret = -EINVAL;
+ goto err;
+ }
+
+ sb->s_flags &= ~SB_RDONLY;
+ }
+
+ c->opts.read_only = opts.read_only;
+
+ up_write(&c->state_lock);
+ }
+
+ if (opt_defined(opts, errors))
+ c->opts.errors = opts.errors;
+err:
+ return bch2_err_class(ret);
+}
+
+static int bch2_show_devname(struct seq_file *seq, struct dentry *root)
+{
+ struct bch_fs *c = root->d_sb->s_fs_info;
+ bool first = true;
+
+ for_each_online_member(c, ca) {
+ if (!first)
+ seq_putc(seq, ':');
+ first = false;
+ seq_puts(seq, ca->disk_sb.sb_name);
+ }
+
+ return 0;
+}
+
+static int bch2_show_options(struct seq_file *seq, struct dentry *root)
+{
+ struct bch_fs *c = root->d_sb->s_fs_info;
+ enum bch_opt_id i;
+ struct printbuf buf = PRINTBUF;
+ int ret = 0;
+
+ for (i = 0; i < bch2_opts_nr; i++) {
+ const struct bch_option *opt = &bch2_opt_table[i];
+ u64 v = bch2_opt_get_by_id(&c->opts, i);
+
+ if (!(opt->flags & OPT_MOUNT))
+ continue;
+
+ if (v == bch2_opt_get_by_id(&bch2_opts_default, i))
+ continue;
+
+ printbuf_reset(&buf);
+ bch2_opt_to_text(&buf, c, c->disk_sb.sb, opt, v,
+ OPT_SHOW_MOUNT_STYLE);
+ seq_putc(seq, ',');
+ seq_puts(seq, buf.buf);
+ }
+
+ if (buf.allocation_failure)
+ ret = -ENOMEM;
+ printbuf_exit(&buf);
+ return ret;
+}
+
+static void bch2_put_super(struct super_block *sb)
+{
+ struct bch_fs *c = sb->s_fs_info;
+
+ __bch2_fs_stop(c);
+}
+
+/*
+ * bcachefs doesn't currently integrate intwrite freeze protection but the
+ * internal write references serve the same purpose. Therefore reuse the
+ * read-only transition code to perform the quiesce. The caveat is that we don't
+ * currently have the ability to block tasks that want a write reference while
+ * the superblock is frozen. This is fine for now, but we should either add
+ * blocking support or find a way to integrate sb_start_intwrite() and friends.
+ */
+static int bch2_freeze(struct super_block *sb)
+{
+ struct bch_fs *c = sb->s_fs_info;
+
+ down_write(&c->state_lock);
+ bch2_fs_read_only(c);
+ up_write(&c->state_lock);
+ return 0;
+}
+
+static int bch2_unfreeze(struct super_block *sb)
+{
+ struct bch_fs *c = sb->s_fs_info;
+ int ret;
+
+ if (test_bit(BCH_FS_emergency_ro, &c->flags))
+ return 0;
+
+ down_write(&c->state_lock);
+ ret = bch2_fs_read_write(c);
+ up_write(&c->state_lock);
+ return ret;
+}
+
+static const struct super_operations bch_super_operations = {
+ .alloc_inode = bch2_alloc_inode,
+ .destroy_inode = bch2_destroy_inode,
+ .write_inode = bch2_vfs_write_inode,
+ .evict_inode = bch2_evict_inode,
+ .sync_fs = bch2_sync_fs,
+ .statfs = bch2_statfs,
+ .show_devname = bch2_show_devname,
+ .show_options = bch2_show_options,
+ .remount_fs = bch2_remount,
+ .put_super = bch2_put_super,
+ .freeze_fs = bch2_freeze,
+ .unfreeze_fs = bch2_unfreeze,
+};
+
+static int bch2_set_super(struct super_block *s, void *data)
+{
+ s->s_fs_info = data;
+ return 0;
+}
+
+static int bch2_noset_super(struct super_block *s, void *data)
+{
+ return -EBUSY;
+}
+
+typedef DARRAY(struct bch_fs *) darray_fs;
+
+static int bch2_test_super(struct super_block *s, void *data)
+{
+ struct bch_fs *c = s->s_fs_info;
+ darray_fs *d = data;
+
+ if (!c)
+ return false;
+
+ darray_for_each(*d, i)
+ if (c != *i)
+ return false;
+ return true;
+}
+
+static struct dentry *bch2_mount(struct file_system_type *fs_type,
+ int flags, const char *dev_name, void *data)
+{
+ struct bch_fs *c;
+ struct super_block *sb;
+ struct inode *vinode;
+ struct bch_opts opts = bch2_opts_empty();
+ int ret;
+
+ opt_set(opts, read_only, (flags & SB_RDONLY) != 0);
+
+ ret = bch2_parse_mount_opts(NULL, &opts, data);
+ if (ret)
+ return ERR_PTR(ret);
+
+ if (!dev_name || strlen(dev_name) == 0)
+ return ERR_PTR(-EINVAL);
+
+ darray_str devs;
+ ret = bch2_split_devs(dev_name, &devs);
+ if (ret)
+ return ERR_PTR(ret);
+
+ darray_fs devs_to_fs = {};
+ darray_for_each(devs, i) {
+ ret = darray_push(&devs_to_fs, bch2_path_to_fs(*i));
+ if (ret) {
+ sb = ERR_PTR(ret);
+ goto got_sb;
+ }
+ }
+
+ sb = sget(fs_type, bch2_test_super, bch2_noset_super, flags|SB_NOSEC, &devs_to_fs);
+ if (!IS_ERR(sb))
+ goto got_sb;
+
+ c = bch2_fs_open(devs.data, devs.nr, opts);
+ if (IS_ERR(c)) {
+ sb = ERR_CAST(c);
+ goto got_sb;
+ }
+
+ /* Some options can't be parsed until after the fs is started: */
+ ret = bch2_parse_mount_opts(c, &opts, data);
+ if (ret) {
+ bch2_fs_stop(c);
+ sb = ERR_PTR(ret);
+ goto got_sb;
+ }
+
+ bch2_opts_apply(&c->opts, opts);
+
+ sb = sget(fs_type, NULL, bch2_set_super, flags|SB_NOSEC, c);
+ if (IS_ERR(sb))
+ bch2_fs_stop(c);
+got_sb:
+ darray_exit(&devs_to_fs);
+ bch2_darray_str_exit(&devs);
+
+ if (IS_ERR(sb)) {
+ ret = PTR_ERR(sb);
+ ret = bch2_err_class(ret);
+ return ERR_PTR(ret);
+ }
+
+ c = sb->s_fs_info;
+
+ if (sb->s_root) {
+ if ((flags ^ sb->s_flags) & SB_RDONLY) {
+ ret = -EBUSY;
+ goto err_put_super;
+ }
+ goto out;
+ }
+
+ sb->s_blocksize = block_bytes(c);
+ sb->s_blocksize_bits = ilog2(block_bytes(c));
+ sb->s_maxbytes = MAX_LFS_FILESIZE;
+ sb->s_op = &bch_super_operations;
+ sb->s_export_op = &bch_export_ops;
+#ifdef CONFIG_BCACHEFS_QUOTA
+ sb->s_qcop = &bch2_quotactl_operations;
+ sb->s_quota_types = QTYPE_MASK_USR|QTYPE_MASK_GRP|QTYPE_MASK_PRJ;
+#endif
+ sb->s_xattr = bch2_xattr_handlers;
+ sb->s_magic = BCACHEFS_STATFS_MAGIC;
+ sb->s_time_gran = c->sb.nsec_per_time_unit;
+ sb->s_time_min = div_s64(S64_MIN, c->sb.time_units_per_sec) + 1;
+ sb->s_time_max = div_s64(S64_MAX, c->sb.time_units_per_sec);
+ c->vfs_sb = sb;
+ strscpy(sb->s_id, c->name, sizeof(sb->s_id));
+
+ ret = super_setup_bdi(sb);
+ if (ret)
+ goto err_put_super;
+
+ sb->s_bdi->ra_pages = VM_READAHEAD_PAGES;
+
+ for_each_online_member(c, ca) {
+ struct block_device *bdev = ca->disk_sb.bdev;
+
+ /* XXX: create an anonymous device for multi device filesystems */
+ sb->s_bdev = bdev;
+ sb->s_dev = bdev->bd_dev;
+ percpu_ref_put(&ca->io_ref);
+ break;
+ }
+
+ c->dev = sb->s_dev;
+
+#ifdef CONFIG_BCACHEFS_POSIX_ACL
+ if (c->opts.acl)
+ sb->s_flags |= SB_POSIXACL;
+#endif
+
+ sb->s_shrink->seeks = 0;
+
+ vinode = bch2_vfs_inode_get(c, BCACHEFS_ROOT_SUBVOL_INUM);
+ ret = PTR_ERR_OR_ZERO(vinode);
+ bch_err_msg(c, ret, "mounting: error getting root inode");
+ if (ret)
+ goto err_put_super;
+
+ sb->s_root = d_make_root(vinode);
+ if (!sb->s_root) {
+ bch_err(c, "error mounting: error allocating root dentry");
+ ret = -ENOMEM;
+ goto err_put_super;
+ }
+
+ sb->s_flags |= SB_ACTIVE;
+out:
+ return dget(sb->s_root);
+
+err_put_super:
+ deactivate_locked_super(sb);
+ return ERR_PTR(bch2_err_class(ret));
+}
+
+static void bch2_kill_sb(struct super_block *sb)
+{
+ struct bch_fs *c = sb->s_fs_info;
+
+ generic_shutdown_super(sb);
+ bch2_fs_free(c);
+}
+
+static struct file_system_type bcache_fs_type = {
+ .owner = THIS_MODULE,
+ .name = "bcachefs",
+ .mount = bch2_mount,
+ .kill_sb = bch2_kill_sb,
+ .fs_flags = FS_REQUIRES_DEV,
+};
+
+MODULE_ALIAS_FS("bcachefs");
+
+void bch2_vfs_exit(void)
+{
+ unregister_filesystem(&bcache_fs_type);
+ kmem_cache_destroy(bch2_inode_cache);
+}
+
+int __init bch2_vfs_init(void)
+{
+ int ret = -ENOMEM;
+
+ bch2_inode_cache = KMEM_CACHE(bch_inode_info, SLAB_RECLAIM_ACCOUNT);
+ if (!bch2_inode_cache)
+ goto err;
+
+ ret = register_filesystem(&bcache_fs_type);
+ if (ret)
+ goto err;
+
+ return 0;
+err:
+ bch2_vfs_exit();
+ return ret;
+}
+
+#endif /* NO_BCACHEFS_FS */
projects / bcachefs-tools-debian / blobdiff