diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h index 1849e29099d01c4e2e6b235243f6a723dbd7c6fa..28bd477f6e57390bf1a26e78866b744cabfe850d 100644 --- a/fs/cifs/cifsglob.h +++ b/fs/cifs/cifsglob.h @@ -897,6 +897,7 @@ struct cifs_tcon { bool broken_posix_open; /* e.g. Samba server versions < 3.3.2, 3.2.9 */ bool broken_sparse_sup; /* if server or share does not support sparse */ bool need_reconnect:1; /* connection reset, tid now invalid */ + bool use_persistent:1; /* use persistent instead of durable handles */ #ifdef CONFIG_CIFS_SMB2 bool print:1; /* set if connection to printer share */ bool bad_network_name:1; /* set if ret status STATUS_BAD_NETWORK_NAME */ diff --git a/fs/cifs/connect.c b/fs/cifs/connect.c index 9a9a543ddf4e310d1472906e31839dd9c9040290..bb35ae735a8e4b67a7a2dd81464b144f244f7fda 100644 --- a/fs/cifs/connect.c +++ b/fs/cifs/connect.c @@ -2673,6 +2673,30 @@ cifs_get_tcon(struct cifs_ses *ses, struct smb_vol *volume_info) cifs_dbg(FYI, "DFS disabled (%d)\n", tcon->Flags); } tcon->seal = volume_info->seal; + tcon->use_persistent = false; + /* check if SMB2 or later, CIFS does not support persistent handles */ + if (volume_info->persistent) { + if (ses->server->vals->protocol_id == 0) { + cifs_dbg(VFS, + "SMB3 or later required for persistent handles\n"); + rc = -EOPNOTSUPP; + goto out_fail; + } else if (ses->server->capabilities & + SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) + tcon->use_persistent = true; + else /* persistent handles requested but not supported */ { + cifs_dbg(VFS, + "Persistent handles not supported on share\n"); + rc = -EOPNOTSUPP; + goto out_fail; + } + } else if ((tcon->capabilities & SMB2_SHARE_CAP_CONTINUOUS_AVAILABILITY) + && (ses->server->capabilities & SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) + && (volume_info->nopersistent == false)) { + cifs_dbg(FYI, "enabling persistent handles\n"); + tcon->use_persistent = true; + } + /* * We can have only one retry value for a connection to a share so for * resources mounted more than once to the same server share the last @@ -3521,6 +3545,12 @@ cifs_mount(struct cifs_sb_info *cifs_sb, struct smb_vol *volume_info) goto mount_fail_check; } + if ((volume_info->persistent == true) && ((ses->server->capabilities & + SMB2_GLOBAL_CAP_PERSISTENT_HANDLES) == 0)) { + cifs_dbg(VFS, "persistent handles not supported by server\n"); + rc = -EOPNOTSUPP; + goto mount_fail_check; + } /* search for existing tcon to this server share */ tcon = cifs_get_tcon(ses, volume_info); if (IS_ERR(tcon)) { diff --git a/fs/cifs/smb2ops.c b/fs/cifs/smb2ops.c index 2f169eb79b4a487b75d8e617826aa08ac946a6b1..53ccdde6ff187c16084e10dd07372d6516d25139 100644 --- a/fs/cifs/smb2ops.c +++ b/fs/cifs/smb2ops.c @@ -1838,7 +1838,7 @@ struct smb_version_values smb21_values = { struct smb_version_values smb30_values = { .version_string = SMB30_VERSION_STRING, .protocol_id = SMB30_PROT_ID, - .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU, + .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES, .large_lock_type = 0, .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK, .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK, @@ -1858,7 +1858,7 @@ struct smb_version_values smb30_values = { struct smb_version_values smb302_values = { .version_string = SMB302_VERSION_STRING, .protocol_id = SMB302_PROT_ID, - .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU, + .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES, .large_lock_type = 0, .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK, .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK, @@ -1879,7 +1879,7 @@ struct smb_version_values smb302_values = { struct smb_version_values smb311_values = { .version_string = SMB311_VERSION_STRING, .protocol_id = SMB311_PROT_ID, - .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU, + .req_capabilities = SMB2_GLOBAL_CAP_DFS | SMB2_GLOBAL_CAP_LEASING | SMB2_GLOBAL_CAP_LARGE_MTU | SMB2_GLOBAL_CAP_PERSISTENT_HANDLES, .large_lock_type = 0, .exclusive_lock_type = SMB2_LOCKFLAG_EXCLUSIVE_LOCK, .shared_lock_type = SMB2_LOCKFLAG_SHARED_LOCK,