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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-24 22:20:50 +07:00
btrfs: Factor out the main deletion process from btrfs_ioctl_snap_destroy()
Factor out the second half of btrfs_ioctl_snap_destroy() as btrfs_delete_subvolume(), which performs some subvolume specific checks before deletion: 1. send is not in progress 2. the subvolume is not the default subvolume 3. the subvolume does not contain other subvolumes and actual deletion process. btrfs_delete_subvolume() requires inode_lock for both @dir and inode of @dentry. The remaining part of btrfs_ioctl_snap_destroy() is mainly permission checks. Note that call of d_delete() is not included in btrfs_delete_subvolume() as this function will also be used by btrfs_rmdir() to delete an empty subvolume and in that case d_delete() is called in VFS layer. As a result, btrfs_unlink_subvol() and may_destroy_subvol() become static functions. No functional changes. Signed-off-by: Tomohiro Misono <misono.tomohiro@jp.fujitsu.com> Reviewed-by: David Sterba <dsterba@suse.com> [ minor comment updates ] Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Misono Tomohiro
David Sterba
parent
ec42f16734
commit
f60a2364a4
@ -3193,11 +3193,7 @@ int btrfs_unlink_inode(struct btrfs_trans_handle *trans,
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int btrfs_add_link(struct btrfs_trans_handle *trans,
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struct btrfs_inode *parent_inode, struct btrfs_inode *inode,
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const char *name, int name_len, int add_backref, u64 index);
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int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct inode *dir, u64 objectid,
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const char *name, int name_len);
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noinline int may_destroy_subvol(struct btrfs_root *root);
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int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry);
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int btrfs_truncate_block(struct inode *inode, loff_t from, loff_t len,
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int front);
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int btrfs_truncate_inode_items(struct btrfs_trans_handle *trans,
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143
fs/btrfs/inode.c
143
fs/btrfs/inode.c
@ -4245,7 +4245,7 @@ static int btrfs_unlink(struct inode *dir, struct dentry *dentry)
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return ret;
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}
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int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
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static int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
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struct btrfs_root *root,
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struct inode *dir, u64 objectid,
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const char *name, int name_len)
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@ -4330,7 +4330,7 @@ int btrfs_unlink_subvol(struct btrfs_trans_handle *trans,
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* Helper to check if the subvolume references other subvolumes or if it's
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* default.
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*/
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noinline int may_destroy_subvol(struct btrfs_root *root)
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static noinline int may_destroy_subvol(struct btrfs_root *root)
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{
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struct btrfs_fs_info *fs_info = root->fs_info;
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struct btrfs_path *path;
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@ -4381,6 +4381,145 @@ noinline int may_destroy_subvol(struct btrfs_root *root)
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return ret;
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}
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int btrfs_delete_subvolume(struct inode *dir, struct dentry *dentry)
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{
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struct btrfs_fs_info *fs_info = btrfs_sb(dentry->d_sb);
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struct btrfs_root *root = BTRFS_I(dir)->root;
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struct inode *inode = d_inode(dentry);
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struct btrfs_root *dest = BTRFS_I(inode)->root;
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struct btrfs_trans_handle *trans;
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struct btrfs_block_rsv block_rsv;
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u64 root_flags;
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u64 qgroup_reserved;
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int ret;
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int err;
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/*
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* Don't allow to delete a subvolume with send in progress. This is
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* inside the inode lock so the error handling that has to drop the bit
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* again is not run concurrently.
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*/
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spin_lock(&dest->root_item_lock);
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root_flags = btrfs_root_flags(&dest->root_item);
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if (dest->send_in_progress == 0) {
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btrfs_set_root_flags(&dest->root_item,
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root_flags | BTRFS_ROOT_SUBVOL_DEAD);
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spin_unlock(&dest->root_item_lock);
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} else {
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spin_unlock(&dest->root_item_lock);
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btrfs_warn(fs_info,
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"attempt to delete subvolume %llu during send",
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dest->root_key.objectid);
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return -EPERM;
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}
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down_write(&fs_info->subvol_sem);
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err = may_destroy_subvol(dest);
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if (err)
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goto out_up_write;
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btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
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/*
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* One for dir inode,
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* two for dir entries,
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* two for root ref/backref.
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*/
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err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
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5, &qgroup_reserved, true);
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if (err)
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goto out_up_write;
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trans = btrfs_start_transaction(root, 0);
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if (IS_ERR(trans)) {
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err = PTR_ERR(trans);
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goto out_release;
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}
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trans->block_rsv = &block_rsv;
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trans->bytes_reserved = block_rsv.size;
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btrfs_record_snapshot_destroy(trans, BTRFS_I(dir));
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ret = btrfs_unlink_subvol(trans, root, dir,
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dest->root_key.objectid,
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dentry->d_name.name,
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dentry->d_name.len);
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if (ret) {
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err = ret;
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btrfs_abort_transaction(trans, ret);
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goto out_end_trans;
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}
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btrfs_record_root_in_trans(trans, dest);
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memset(&dest->root_item.drop_progress, 0,
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sizeof(dest->root_item.drop_progress));
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dest->root_item.drop_level = 0;
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btrfs_set_root_refs(&dest->root_item, 0);
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if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) {
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ret = btrfs_insert_orphan_item(trans,
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fs_info->tree_root,
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dest->root_key.objectid);
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if (ret) {
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btrfs_abort_transaction(trans, ret);
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err = ret;
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goto out_end_trans;
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}
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}
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ret = btrfs_uuid_tree_rem(trans, fs_info, dest->root_item.uuid,
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BTRFS_UUID_KEY_SUBVOL,
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dest->root_key.objectid);
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if (ret && ret != -ENOENT) {
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btrfs_abort_transaction(trans, ret);
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err = ret;
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goto out_end_trans;
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}
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if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) {
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ret = btrfs_uuid_tree_rem(trans, fs_info,
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dest->root_item.received_uuid,
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BTRFS_UUID_KEY_RECEIVED_SUBVOL,
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dest->root_key.objectid);
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if (ret && ret != -ENOENT) {
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btrfs_abort_transaction(trans, ret);
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err = ret;
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goto out_end_trans;
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}
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}
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out_end_trans:
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trans->block_rsv = NULL;
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trans->bytes_reserved = 0;
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ret = btrfs_end_transaction(trans);
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if (ret && !err)
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err = ret;
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inode->i_flags |= S_DEAD;
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out_release:
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btrfs_subvolume_release_metadata(fs_info, &block_rsv);
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out_up_write:
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up_write(&fs_info->subvol_sem);
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if (err) {
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spin_lock(&dest->root_item_lock);
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root_flags = btrfs_root_flags(&dest->root_item);
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btrfs_set_root_flags(&dest->root_item,
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root_flags & ~BTRFS_ROOT_SUBVOL_DEAD);
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spin_unlock(&dest->root_item_lock);
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} else {
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d_invalidate(dentry);
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btrfs_invalidate_inodes(dest);
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ASSERT(dest->send_in_progress == 0);
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/* the last ref */
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if (dest->ino_cache_inode) {
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iput(dest->ino_cache_inode);
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dest->ino_cache_inode = NULL;
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}
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}
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return err;
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}
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static int btrfs_rmdir(struct inode *dir, struct dentry *dentry)
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{
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struct inode *inode = d_inode(dentry);
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131
fs/btrfs/ioctl.c
131
fs/btrfs/ioctl.c
@ -2255,12 +2255,7 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
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struct btrfs_root *root = BTRFS_I(dir)->root;
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struct btrfs_root *dest = NULL;
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struct btrfs_ioctl_vol_args *vol_args;
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struct btrfs_trans_handle *trans;
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struct btrfs_block_rsv block_rsv;
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u64 root_flags;
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u64 qgroup_reserved;
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int namelen;
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int ret;
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int err = 0;
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if (!S_ISDIR(dir->i_mode))
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@ -2344,133 +2339,11 @@ static noinline int btrfs_ioctl_snap_destroy(struct file *file,
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}
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inode_lock(inode);
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/*
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* Don't allow to delete a subvolume with send in progress. This is
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* inside the i_mutex so the error handling that has to drop the bit
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* again is not run concurrently.
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*/
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spin_lock(&dest->root_item_lock);
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root_flags = btrfs_root_flags(&dest->root_item);
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if (dest->send_in_progress == 0) {
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btrfs_set_root_flags(&dest->root_item,
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root_flags | BTRFS_ROOT_SUBVOL_DEAD);
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spin_unlock(&dest->root_item_lock);
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} else {
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spin_unlock(&dest->root_item_lock);
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btrfs_warn(fs_info,
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"Attempt to delete subvolume %llu during send",
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dest->root_key.objectid);
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err = -EPERM;
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goto out_unlock_inode;
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}
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down_write(&fs_info->subvol_sem);
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err = may_destroy_subvol(dest);
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if (err)
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goto out_up_write;
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btrfs_init_block_rsv(&block_rsv, BTRFS_BLOCK_RSV_TEMP);
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/*
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* One for dir inode, two for dir entries, two for root
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* ref/backref.
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*/
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err = btrfs_subvolume_reserve_metadata(root, &block_rsv,
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5, &qgroup_reserved, true);
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if (err)
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goto out_up_write;
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trans = btrfs_start_transaction(root, 0);
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if (IS_ERR(trans)) {
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err = PTR_ERR(trans);
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goto out_release;
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}
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trans->block_rsv = &block_rsv;
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trans->bytes_reserved = block_rsv.size;
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btrfs_record_snapshot_destroy(trans, BTRFS_I(dir));
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ret = btrfs_unlink_subvol(trans, root, dir,
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dest->root_key.objectid,
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dentry->d_name.name,
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dentry->d_name.len);
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if (ret) {
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err = ret;
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btrfs_abort_transaction(trans, ret);
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goto out_end_trans;
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}
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btrfs_record_root_in_trans(trans, dest);
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memset(&dest->root_item.drop_progress, 0,
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sizeof(dest->root_item.drop_progress));
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dest->root_item.drop_level = 0;
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btrfs_set_root_refs(&dest->root_item, 0);
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if (!test_and_set_bit(BTRFS_ROOT_ORPHAN_ITEM_INSERTED, &dest->state)) {
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ret = btrfs_insert_orphan_item(trans,
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fs_info->tree_root,
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dest->root_key.objectid);
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if (ret) {
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btrfs_abort_transaction(trans, ret);
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err = ret;
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goto out_end_trans;
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}
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}
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ret = btrfs_uuid_tree_rem(trans, fs_info, dest->root_item.uuid,
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BTRFS_UUID_KEY_SUBVOL,
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dest->root_key.objectid);
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if (ret && ret != -ENOENT) {
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btrfs_abort_transaction(trans, ret);
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err = ret;
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goto out_end_trans;
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}
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if (!btrfs_is_empty_uuid(dest->root_item.received_uuid)) {
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ret = btrfs_uuid_tree_rem(trans, fs_info,
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dest->root_item.received_uuid,
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BTRFS_UUID_KEY_RECEIVED_SUBVOL,
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dest->root_key.objectid);
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if (ret && ret != -ENOENT) {
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btrfs_abort_transaction(trans, ret);
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err = ret;
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goto out_end_trans;
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}
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}
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out_end_trans:
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trans->block_rsv = NULL;
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trans->bytes_reserved = 0;
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ret = btrfs_end_transaction(trans);
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if (ret && !err)
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err = ret;
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inode->i_flags |= S_DEAD;
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out_release:
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btrfs_subvolume_release_metadata(fs_info, &block_rsv);
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out_up_write:
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up_write(&fs_info->subvol_sem);
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if (err) {
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spin_lock(&dest->root_item_lock);
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root_flags = btrfs_root_flags(&dest->root_item);
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btrfs_set_root_flags(&dest->root_item,
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root_flags & ~BTRFS_ROOT_SUBVOL_DEAD);
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spin_unlock(&dest->root_item_lock);
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}
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out_unlock_inode:
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err = btrfs_delete_subvolume(dir, dentry);
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inode_unlock(inode);
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if (!err) {
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d_invalidate(dentry);
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btrfs_invalidate_inodes(dest);
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if (!err)
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d_delete(dentry);
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ASSERT(dest->send_in_progress == 0);
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/* the last ref */
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if (dest->ino_cache_inode) {
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iput(dest->ino_cache_inode);
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dest->ino_cache_inode = NULL;
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}
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}
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out_dput:
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dput(dentry);
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out_unlock_dir:
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