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496 lines
12 KiB
C
496 lines
12 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include "bcachefs.h"
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#include "acl.h"
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#include "btree_update.h"
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#include "dirent.h"
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#include "fs-common.h"
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#include "inode.h"
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#include "subvolume.h"
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#include "xattr.h"
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#include <linux/posix_acl.h>
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static inline int is_subdir_for_nlink(struct bch_inode_unpacked *inode)
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{
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return S_ISDIR(inode->bi_mode) && !inode->bi_subvol;
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}
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int bch2_create_trans(struct btree_trans *trans,
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subvol_inum dir,
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struct bch_inode_unpacked *dir_u,
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struct bch_inode_unpacked *new_inode,
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const struct qstr *name,
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uid_t uid, gid_t gid, umode_t mode, dev_t rdev,
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struct posix_acl *default_acl,
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struct posix_acl *acl,
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subvol_inum snapshot_src,
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unsigned flags)
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{
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struct bch_fs *c = trans->c;
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struct btree_iter dir_iter = { NULL };
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struct btree_iter inode_iter = { NULL };
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subvol_inum new_inum = dir;
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u64 now = bch2_current_time(c);
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u64 cpu = raw_smp_processor_id();
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u64 dir_target;
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u32 snapshot;
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unsigned dir_type = mode_to_type(mode);
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int ret;
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ret = bch2_subvolume_get_snapshot(trans, dir.subvol, &snapshot);
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if (ret)
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goto err;
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ret = bch2_inode_peek(trans, &dir_iter, dir_u, dir, BTREE_ITER_INTENT);
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if (ret)
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goto err;
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if (!(flags & BCH_CREATE_SNAPSHOT)) {
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/* Normal create path - allocate a new inode: */
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bch2_inode_init_late(new_inode, now, uid, gid, mode, rdev, dir_u);
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if (flags & BCH_CREATE_TMPFILE)
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new_inode->bi_flags |= BCH_INODE_unlinked;
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ret = bch2_inode_create(trans, &inode_iter, new_inode, snapshot, cpu);
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if (ret)
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goto err;
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snapshot_src = (subvol_inum) { 0 };
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} else {
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/*
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* Creating a snapshot - we're not allocating a new inode, but
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* we do have to lookup the root inode of the subvolume we're
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* snapshotting and update it (in the new snapshot):
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*/
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if (!snapshot_src.inum) {
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/* Inode wasn't specified, just snapshot: */
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struct bch_subvolume s;
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ret = bch2_subvolume_get(trans, snapshot_src.subvol, true,
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BTREE_ITER_CACHED, &s);
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if (ret)
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goto err;
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snapshot_src.inum = le64_to_cpu(s.inode);
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}
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ret = bch2_inode_peek(trans, &inode_iter, new_inode, snapshot_src,
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BTREE_ITER_INTENT);
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if (ret)
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goto err;
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if (new_inode->bi_subvol != snapshot_src.subvol) {
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/* Not a subvolume root: */
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ret = -EINVAL;
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goto err;
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}
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/*
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* If we're not root, we have to own the subvolume being
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* snapshotted:
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*/
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if (uid && new_inode->bi_uid != uid) {
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ret = -EPERM;
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goto err;
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}
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flags |= BCH_CREATE_SUBVOL;
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}
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new_inum.inum = new_inode->bi_inum;
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dir_target = new_inode->bi_inum;
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if (flags & BCH_CREATE_SUBVOL) {
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u32 new_subvol, dir_snapshot;
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ret = bch2_subvolume_create(trans, new_inode->bi_inum,
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snapshot_src.subvol,
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&new_subvol, &snapshot,
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(flags & BCH_CREATE_SNAPSHOT_RO) != 0);
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if (ret)
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goto err;
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new_inode->bi_parent_subvol = dir.subvol;
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new_inode->bi_subvol = new_subvol;
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new_inum.subvol = new_subvol;
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dir_target = new_subvol;
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dir_type = DT_SUBVOL;
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ret = bch2_subvolume_get_snapshot(trans, dir.subvol, &dir_snapshot);
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if (ret)
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goto err;
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bch2_btree_iter_set_snapshot(&dir_iter, dir_snapshot);
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ret = bch2_btree_iter_traverse(&dir_iter);
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if (ret)
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goto err;
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}
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if (!(flags & BCH_CREATE_SNAPSHOT)) {
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if (default_acl) {
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ret = bch2_set_acl_trans(trans, new_inum, new_inode,
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default_acl, ACL_TYPE_DEFAULT);
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if (ret)
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goto err;
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}
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if (acl) {
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ret = bch2_set_acl_trans(trans, new_inum, new_inode,
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acl, ACL_TYPE_ACCESS);
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if (ret)
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goto err;
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}
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}
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if (!(flags & BCH_CREATE_TMPFILE)) {
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struct bch_hash_info dir_hash = bch2_hash_info_init(c, dir_u);
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u64 dir_offset;
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if (is_subdir_for_nlink(new_inode))
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dir_u->bi_nlink++;
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dir_u->bi_mtime = dir_u->bi_ctime = now;
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ret = bch2_inode_write(trans, &dir_iter, dir_u);
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if (ret)
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goto err;
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ret = bch2_dirent_create(trans, dir, &dir_hash,
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dir_type,
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name,
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dir_target,
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&dir_offset,
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BCH_HASH_SET_MUST_CREATE);
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if (ret)
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goto err;
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new_inode->bi_dir = dir_u->bi_inum;
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new_inode->bi_dir_offset = dir_offset;
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}
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inode_iter.flags &= ~BTREE_ITER_ALL_SNAPSHOTS;
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bch2_btree_iter_set_snapshot(&inode_iter, snapshot);
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ret = bch2_btree_iter_traverse(&inode_iter) ?:
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bch2_inode_write(trans, &inode_iter, new_inode);
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err:
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bch2_trans_iter_exit(trans, &inode_iter);
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bch2_trans_iter_exit(trans, &dir_iter);
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return ret;
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}
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int bch2_link_trans(struct btree_trans *trans,
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subvol_inum dir, struct bch_inode_unpacked *dir_u,
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subvol_inum inum, struct bch_inode_unpacked *inode_u,
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const struct qstr *name)
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{
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struct bch_fs *c = trans->c;
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struct btree_iter dir_iter = { NULL };
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struct btree_iter inode_iter = { NULL };
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struct bch_hash_info dir_hash;
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u64 now = bch2_current_time(c);
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u64 dir_offset = 0;
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int ret;
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if (dir.subvol != inum.subvol)
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return -EXDEV;
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ret = bch2_inode_peek(trans, &inode_iter, inode_u, inum, BTREE_ITER_INTENT);
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if (ret)
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goto err;
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inode_u->bi_ctime = now;
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ret = bch2_inode_nlink_inc(inode_u);
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if (ret)
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return ret;
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ret = bch2_inode_peek(trans, &dir_iter, dir_u, dir, BTREE_ITER_INTENT);
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if (ret)
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goto err;
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if (bch2_reinherit_attrs(inode_u, dir_u)) {
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ret = -EXDEV;
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goto err;
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}
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dir_u->bi_mtime = dir_u->bi_ctime = now;
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dir_hash = bch2_hash_info_init(c, dir_u);
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ret = bch2_dirent_create(trans, dir, &dir_hash,
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mode_to_type(inode_u->bi_mode),
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name, inum.inum, &dir_offset,
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BCH_HASH_SET_MUST_CREATE);
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if (ret)
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goto err;
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inode_u->bi_dir = dir.inum;
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inode_u->bi_dir_offset = dir_offset;
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ret = bch2_inode_write(trans, &dir_iter, dir_u) ?:
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bch2_inode_write(trans, &inode_iter, inode_u);
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err:
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bch2_trans_iter_exit(trans, &dir_iter);
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bch2_trans_iter_exit(trans, &inode_iter);
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return ret;
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}
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int bch2_unlink_trans(struct btree_trans *trans,
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subvol_inum dir,
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struct bch_inode_unpacked *dir_u,
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struct bch_inode_unpacked *inode_u,
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const struct qstr *name,
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bool deleting_snapshot)
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{
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struct bch_fs *c = trans->c;
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struct btree_iter dir_iter = { NULL };
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struct btree_iter dirent_iter = { NULL };
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struct btree_iter inode_iter = { NULL };
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struct bch_hash_info dir_hash;
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subvol_inum inum;
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u64 now = bch2_current_time(c);
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struct bkey_s_c k;
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int ret;
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ret = bch2_inode_peek(trans, &dir_iter, dir_u, dir, BTREE_ITER_INTENT);
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if (ret)
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goto err;
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dir_hash = bch2_hash_info_init(c, dir_u);
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ret = __bch2_dirent_lookup_trans(trans, &dirent_iter, dir, &dir_hash,
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name, &inum, BTREE_ITER_INTENT);
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if (ret)
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goto err;
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ret = bch2_inode_peek(trans, &inode_iter, inode_u, inum,
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BTREE_ITER_INTENT);
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if (ret)
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goto err;
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if (!deleting_snapshot && S_ISDIR(inode_u->bi_mode)) {
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ret = bch2_empty_dir_trans(trans, inum);
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if (ret)
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goto err;
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}
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if (deleting_snapshot && !inode_u->bi_subvol) {
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ret = -BCH_ERR_ENOENT_not_subvol;
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goto err;
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}
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if (deleting_snapshot || inode_u->bi_subvol) {
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ret = bch2_subvolume_unlink(trans, inode_u->bi_subvol);
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if (ret)
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goto err;
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k = bch2_btree_iter_peek_slot(&dirent_iter);
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ret = bkey_err(k);
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if (ret)
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goto err;
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/*
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* If we're deleting a subvolume, we need to really delete the
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* dirent, not just emit a whiteout in the current snapshot:
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*/
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bch2_btree_iter_set_snapshot(&dirent_iter, k.k->p.snapshot);
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ret = bch2_btree_iter_traverse(&dirent_iter);
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if (ret)
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goto err;
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} else {
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bch2_inode_nlink_dec(trans, inode_u);
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}
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if (inode_u->bi_dir == dirent_iter.pos.inode &&
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inode_u->bi_dir_offset == dirent_iter.pos.offset) {
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inode_u->bi_dir = 0;
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inode_u->bi_dir_offset = 0;
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}
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dir_u->bi_mtime = dir_u->bi_ctime = inode_u->bi_ctime = now;
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dir_u->bi_nlink -= is_subdir_for_nlink(inode_u);
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ret = bch2_hash_delete_at(trans, bch2_dirent_hash_desc,
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&dir_hash, &dirent_iter,
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BTREE_UPDATE_INTERNAL_SNAPSHOT_NODE) ?:
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bch2_inode_write(trans, &dir_iter, dir_u) ?:
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bch2_inode_write(trans, &inode_iter, inode_u);
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err:
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bch2_trans_iter_exit(trans, &inode_iter);
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bch2_trans_iter_exit(trans, &dirent_iter);
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bch2_trans_iter_exit(trans, &dir_iter);
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return ret;
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}
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bool bch2_reinherit_attrs(struct bch_inode_unpacked *dst_u,
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struct bch_inode_unpacked *src_u)
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{
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u64 src, dst;
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unsigned id;
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bool ret = false;
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for (id = 0; id < Inode_opt_nr; id++) {
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/* Skip attributes that were explicitly set on this inode */
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if (dst_u->bi_fields_set & (1 << id))
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continue;
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src = bch2_inode_opt_get(src_u, id);
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dst = bch2_inode_opt_get(dst_u, id);
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if (src == dst)
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continue;
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bch2_inode_opt_set(dst_u, id, src);
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ret = true;
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}
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return ret;
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}
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int bch2_rename_trans(struct btree_trans *trans,
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subvol_inum src_dir, struct bch_inode_unpacked *src_dir_u,
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subvol_inum dst_dir, struct bch_inode_unpacked *dst_dir_u,
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struct bch_inode_unpacked *src_inode_u,
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struct bch_inode_unpacked *dst_inode_u,
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const struct qstr *src_name,
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const struct qstr *dst_name,
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enum bch_rename_mode mode)
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{
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struct bch_fs *c = trans->c;
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struct btree_iter src_dir_iter = { NULL };
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struct btree_iter dst_dir_iter = { NULL };
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struct btree_iter src_inode_iter = { NULL };
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struct btree_iter dst_inode_iter = { NULL };
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struct bch_hash_info src_hash, dst_hash;
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subvol_inum src_inum, dst_inum;
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u64 src_offset, dst_offset;
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u64 now = bch2_current_time(c);
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int ret;
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ret = bch2_inode_peek(trans, &src_dir_iter, src_dir_u, src_dir,
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BTREE_ITER_INTENT);
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if (ret)
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goto err;
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src_hash = bch2_hash_info_init(c, src_dir_u);
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if (dst_dir.inum != src_dir.inum ||
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dst_dir.subvol != src_dir.subvol) {
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ret = bch2_inode_peek(trans, &dst_dir_iter, dst_dir_u, dst_dir,
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BTREE_ITER_INTENT);
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if (ret)
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goto err;
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dst_hash = bch2_hash_info_init(c, dst_dir_u);
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} else {
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dst_dir_u = src_dir_u;
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dst_hash = src_hash;
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}
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ret = bch2_dirent_rename(trans,
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src_dir, &src_hash,
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dst_dir, &dst_hash,
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src_name, &src_inum, &src_offset,
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dst_name, &dst_inum, &dst_offset,
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mode);
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if (ret)
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goto err;
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ret = bch2_inode_peek(trans, &src_inode_iter, src_inode_u, src_inum,
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BTREE_ITER_INTENT);
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if (ret)
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goto err;
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if (dst_inum.inum) {
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ret = bch2_inode_peek(trans, &dst_inode_iter, dst_inode_u, dst_inum,
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BTREE_ITER_INTENT);
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if (ret)
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goto err;
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}
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src_inode_u->bi_dir = dst_dir_u->bi_inum;
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src_inode_u->bi_dir_offset = dst_offset;
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if (mode == BCH_RENAME_EXCHANGE) {
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dst_inode_u->bi_dir = src_dir_u->bi_inum;
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dst_inode_u->bi_dir_offset = src_offset;
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}
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if (mode == BCH_RENAME_OVERWRITE &&
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dst_inode_u->bi_dir == dst_dir_u->bi_inum &&
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dst_inode_u->bi_dir_offset == src_offset) {
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dst_inode_u->bi_dir = 0;
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dst_inode_u->bi_dir_offset = 0;
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}
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if (mode == BCH_RENAME_OVERWRITE) {
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if (S_ISDIR(src_inode_u->bi_mode) !=
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S_ISDIR(dst_inode_u->bi_mode)) {
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ret = -ENOTDIR;
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goto err;
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}
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if (S_ISDIR(dst_inode_u->bi_mode) &&
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bch2_empty_dir_trans(trans, dst_inum)) {
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ret = -ENOTEMPTY;
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goto err;
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}
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}
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if (bch2_reinherit_attrs(src_inode_u, dst_dir_u) &&
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S_ISDIR(src_inode_u->bi_mode)) {
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ret = -EXDEV;
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goto err;
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}
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if (mode == BCH_RENAME_EXCHANGE &&
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bch2_reinherit_attrs(dst_inode_u, src_dir_u) &&
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S_ISDIR(dst_inode_u->bi_mode)) {
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ret = -EXDEV;
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goto err;
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}
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if (is_subdir_for_nlink(src_inode_u)) {
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src_dir_u->bi_nlink--;
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dst_dir_u->bi_nlink++;
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}
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if (dst_inum.inum && is_subdir_for_nlink(dst_inode_u)) {
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dst_dir_u->bi_nlink--;
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src_dir_u->bi_nlink += mode == BCH_RENAME_EXCHANGE;
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}
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if (mode == BCH_RENAME_OVERWRITE)
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bch2_inode_nlink_dec(trans, dst_inode_u);
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src_dir_u->bi_mtime = now;
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src_dir_u->bi_ctime = now;
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if (src_dir.inum != dst_dir.inum) {
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dst_dir_u->bi_mtime = now;
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dst_dir_u->bi_ctime = now;
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}
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src_inode_u->bi_ctime = now;
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if (dst_inum.inum)
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dst_inode_u->bi_ctime = now;
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ret = bch2_inode_write(trans, &src_dir_iter, src_dir_u) ?:
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(src_dir.inum != dst_dir.inum
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? bch2_inode_write(trans, &dst_dir_iter, dst_dir_u)
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: 0) ?:
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bch2_inode_write(trans, &src_inode_iter, src_inode_u) ?:
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|
(dst_inum.inum
|
|
? bch2_inode_write(trans, &dst_inode_iter, dst_inode_u)
|
|
: 0);
|
|
err:
|
|
bch2_trans_iter_exit(trans, &dst_inode_iter);
|
|
bch2_trans_iter_exit(trans, &src_inode_iter);
|
|
bch2_trans_iter_exit(trans, &dst_dir_iter);
|
|
bch2_trans_iter_exit(trans, &src_dir_iter);
|
|
return ret;
|
|
}
|