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