diff options
Diffstat (limited to 'fs/smb/server/vfs_cache.c')
| -rw-r--r-- | fs/smb/server/vfs_cache.c | 160 |
1 files changed, 146 insertions, 14 deletions
diff --git a/fs/smb/server/vfs_cache.c b/fs/smb/server/vfs_cache.c index 4e82ff627d..8b2e37c871 100644 --- a/fs/smb/server/vfs_cache.c +++ b/fs/smb/server/vfs_cache.c @@ -165,7 +165,7 @@ static int ksmbd_inode_init(struct ksmbd_inode *ci, struct ksmbd_file *fp) ci->m_fattr = 0; INIT_LIST_HEAD(&ci->m_fp_list); INIT_LIST_HEAD(&ci->m_op_list); - rwlock_init(&ci->m_lock); + init_rwsem(&ci->m_lock); ci->m_de = fp->filp->f_path.dentry; return 0; } @@ -254,21 +254,22 @@ static void __ksmbd_inode_close(struct ksmbd_file *fp) ci->m_flags &= ~S_DEL_ON_CLS_STREAM; err = ksmbd_vfs_remove_xattr(file_mnt_idmap(filp), &filp->f_path, - fp->stream.name); + fp->stream.name, + true); if (err) pr_err("remove xattr failed : %s\n", fp->stream.name); } if (atomic_dec_and_test(&ci->m_count)) { - write_lock(&ci->m_lock); + down_write(&ci->m_lock); if (ci->m_flags & (S_DEL_ON_CLS | S_DEL_PENDING)) { ci->m_flags &= ~(S_DEL_ON_CLS | S_DEL_PENDING); - write_unlock(&ci->m_lock); + up_write(&ci->m_lock); ksmbd_vfs_unlink(filp); - write_lock(&ci->m_lock); + down_write(&ci->m_lock); } - write_unlock(&ci->m_lock); + up_write(&ci->m_lock); ksmbd_inode_free(ci); } @@ -289,9 +290,9 @@ static void __ksmbd_remove_fd(struct ksmbd_file_table *ft, struct ksmbd_file *fp if (!has_file_id(fp->volatile_id)) return; - write_lock(&fp->f_ci->m_lock); + down_write(&fp->f_ci->m_lock); list_del_init(&fp->node); - write_unlock(&fp->f_ci->m_lock); + up_write(&fp->f_ci->m_lock); write_lock(&ft->lock); idr_remove(ft->idr, fp->volatile_id); @@ -305,7 +306,8 @@ static void __ksmbd_close_fd(struct ksmbd_file_table *ft, struct ksmbd_file *fp) fd_limit_close(); __ksmbd_remove_durable_fd(fp); - __ksmbd_remove_fd(ft, fp); + if (ft) + __ksmbd_remove_fd(ft, fp); close_id_del_oplock(fp); filp = fp->filp; @@ -465,11 +467,32 @@ struct ksmbd_file *ksmbd_lookup_fd_slow(struct ksmbd_work *work, u64 id, return fp; } -struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id) +struct ksmbd_file *ksmbd_lookup_global_fd(unsigned long long id) { return __ksmbd_lookup_fd(&global_ft, id); } +struct ksmbd_file *ksmbd_lookup_durable_fd(unsigned long long id) +{ + struct ksmbd_file *fp; + + fp = __ksmbd_lookup_fd(&global_ft, id); + if (fp && fp->conn) { + ksmbd_put_durable_fd(fp); + fp = NULL; + } + + return fp; +} + +void ksmbd_put_durable_fd(struct ksmbd_file *fp) +{ + if (!atomic_dec_and_test(&fp->refcount)) + return; + + __ksmbd_close_fd(NULL, fp); +} + struct ksmbd_file *ksmbd_lookup_fd_cguid(char *cguid) { struct ksmbd_file *fp = NULL; @@ -501,17 +524,17 @@ struct ksmbd_file *ksmbd_lookup_fd_inode(struct dentry *dentry) if (!ci) return NULL; - read_lock(&ci->m_lock); + down_read(&ci->m_lock); list_for_each_entry(lfp, &ci->m_fp_list, node) { if (inode == file_inode(lfp->filp)) { atomic_dec(&ci->m_count); lfp = ksmbd_fp_get(lfp); - read_unlock(&ci->m_lock); + up_read(&ci->m_lock); return lfp; } } atomic_dec(&ci->m_count); - read_unlock(&ci->m_lock); + up_read(&ci->m_lock); return NULL; } @@ -639,6 +662,32 @@ __close_file_table_ids(struct ksmbd_file_table *ft, return num; } +static inline bool is_reconnectable(struct ksmbd_file *fp) +{ + struct oplock_info *opinfo = opinfo_get(fp); + bool reconn = false; + + if (!opinfo) + return false; + + if (opinfo->op_state != OPLOCK_STATE_NONE) { + opinfo_put(opinfo); + return false; + } + + if (fp->is_resilient || fp->is_persistent) + reconn = true; + else if (fp->is_durable && opinfo->is_lease && + opinfo->o_lease->state & SMB2_LEASE_HANDLE_CACHING_LE) + reconn = true; + + else if (fp->is_durable && opinfo->level == SMB2_OPLOCK_LEVEL_BATCH) + reconn = true; + + opinfo_put(opinfo); + return reconn; +} + static bool tree_conn_fd_check(struct ksmbd_tree_connect *tcon, struct ksmbd_file *fp) { @@ -648,7 +697,28 @@ static bool tree_conn_fd_check(struct ksmbd_tree_connect *tcon, static bool session_fd_check(struct ksmbd_tree_connect *tcon, struct ksmbd_file *fp) { - return false; + struct ksmbd_inode *ci; + struct oplock_info *op; + struct ksmbd_conn *conn; + + if (!is_reconnectable(fp)) + return false; + + conn = fp->conn; + ci = fp->f_ci; + down_write(&ci->m_lock); + list_for_each_entry_rcu(op, &ci->m_op_list, op_entry) { + if (op->conn != conn) + continue; + op->conn = NULL; + } + up_write(&ci->m_lock); + + fp->conn = NULL; + fp->tcon = NULL; + fp->volatile_id = KSMBD_NO_FID; + + return true; } void ksmbd_close_tree_conn_fds(struct ksmbd_work *work) @@ -687,6 +757,68 @@ void ksmbd_free_global_file_table(void) ksmbd_destroy_file_table(&global_ft); } +int ksmbd_validate_name_reconnect(struct ksmbd_share_config *share, + struct ksmbd_file *fp, char *name) +{ + char *pathname, *ab_pathname; + int ret = 0; + + pathname = kmalloc(PATH_MAX, GFP_KERNEL); + if (!pathname) + return -EACCES; + + ab_pathname = d_path(&fp->filp->f_path, pathname, PATH_MAX); + if (IS_ERR(ab_pathname)) { + kfree(pathname); + return -EACCES; + } + + if (name && strcmp(&ab_pathname[share->path_sz + 1], name)) { + ksmbd_debug(SMB, "invalid name reconnect %s\n", name); + ret = -EINVAL; + } + + kfree(pathname); + + return ret; +} + +int ksmbd_reopen_durable_fd(struct ksmbd_work *work, struct ksmbd_file *fp) +{ + struct ksmbd_inode *ci; + struct oplock_info *op; + + if (!fp->is_durable || fp->conn || fp->tcon) { + pr_err("Invalid durable fd [%p:%p]\n", fp->conn, fp->tcon); + return -EBADF; + } + + if (has_file_id(fp->volatile_id)) { + pr_err("Still in use durable fd: %llu\n", fp->volatile_id); + return -EBADF; + } + + fp->conn = work->conn; + fp->tcon = work->tcon; + + ci = fp->f_ci; + down_write(&ci->m_lock); + list_for_each_entry_rcu(op, &ci->m_op_list, op_entry) { + if (op->conn) + continue; + op->conn = fp->conn; + } + up_write(&ci->m_lock); + + __open_id(&work->sess->file_table, fp, OPEN_ID_TYPE_VOLATILE_ID); + if (!has_file_id(fp->volatile_id)) { + fp->conn = NULL; + fp->tcon = NULL; + return -EBADF; + } + return 0; +} + int ksmbd_init_file_table(struct ksmbd_file_table *ft) { ft->idr = kzalloc(sizeof(struct idr), GFP_KERNEL); |