Merge tag '6.6-rc-smb3-client-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6

Pull smb client fixes from Steve French:

 - six smb3 client fixes including ones to allow controlling smb3
   directory caching timeout and limits, and one debugging improvement

 - one fix for nls Kconfig (don't need to expose NLS_UCS2_UTILS option)

 - one minor spnego registry update

* tag '6.6-rc-smb3-client-fixes-part2' of git://git.samba.org/sfrench/cifs-2.6:
  spnego: add missing OID to oid registry
  smb3: fix minor typo in SMB2_GLOBAL_CAP_LARGE_MTU
  cifs: update internal module version number for cifs.ko
  smb3: allow controlling maximum number of cached directories
  smb3: add trace point for queryfs (statfs)
  nls: Hide new NLS_UCS2_UTILS
  smb3: allow controlling length of time directory entries are cached with dir leases
  smb: propagate error code of extract_sharename()

Author: torvalds

fs/nls/Kconfig

@@ -618,11 +618,6 @@ config NLS_UTF8
 	  the Unicode/ISO9646 universal character set.
 
 config NLS_UCS2_UTILS
-	tristate "NLS UCS-2 UTILS"
-	help
-	  Set of older UCS-2 conversion utilities and tables used by some
-	  filesystems including SMB/CIFS.  This includes upper case conversion
-	  tables. This will automatically be selected when the filesystem
-	  that uses it is selected.
+	tristate
 
 endif # NLS

fs/smb/client/cached_dir.c

@@ -18,7 +18,8 @@ static void smb2_close_cached_fid(struct kref *ref);
 
 static struct cached_fid *find_or_create_cached_dir(struct cached_fids *cfids,
 						    const char *path,
-						    bool lookup_only)
+						    bool lookup_only,
+						    __u32 max_cached_dirs)
 {
 	struct cached_fid *cfid;
 
@@ -43,7 +44,7 @@ static struct cached_fid *find_or_create_cached_dir(struct cached_fids *cfids,
 		spin_unlock(&cfids->cfid_list_lock);
 		return NULL;
 	}
-	if (cfids->num_entries >= MAX_CACHED_FIDS) {
+	if (cfids->num_entries >= max_cached_dirs) {
 		spin_unlock(&cfids->cfid_list_lock);
 		return NULL;
 	}
@@ -145,7 +146,7 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
 	const char *npath;
 
 	if (tcon == NULL || tcon->cfids == NULL || tcon->nohandlecache ||
-	    is_smb1_server(tcon->ses->server))
+	    is_smb1_server(tcon->ses->server) || (dir_cache_timeout == 0))
 		return -EOPNOTSUPP;
 
 	ses = tcon->ses;
@@ -162,7 +163,7 @@ int open_cached_dir(unsigned int xid, struct cifs_tcon *tcon,
 	if (!utf16_path)
 		return -ENOMEM;
 
-	cfid = find_or_create_cached_dir(cfids, path, lookup_only);
+	cfid = find_or_create_cached_dir(cfids, path, lookup_only, tcon->max_cached_dirs);
 	if (cfid == NULL) {
 		kfree(utf16_path);
 		return -ENOENT;
@@ -582,7 +583,7 @@ cifs_cfids_laundromat_thread(void *p)
 			return 0;
 		spin_lock(&cfids->cfid_list_lock);
 		list_for_each_entry_safe(cfid, q, &cfids->entries, entry) {
-			if (time_after(jiffies, cfid->time + HZ * 30)) {
+			if (time_after(jiffies, cfid->time + HZ * dir_cache_timeout)) {
 				list_del(&cfid->entry);
 				list_add(&cfid->entry, &entry);
 				cfids->num_entries--;

fs/smb/client/cached_dir.h

@@ -49,7 +49,7 @@ struct cached_fid {
 	struct cached_dirents dirents;
 };
 
-#define MAX_CACHED_FIDS 16
+/* default MAX_CACHED_FIDS is 16 */
 struct cached_fids {
 	/* Must be held when:
 	 * - accessing the cfids->entries list

fs/smb/client/cifsfs.c

@@ -117,6 +117,10 @@ module_param(cifs_max_pending, uint, 0444);
 MODULE_PARM_DESC(cifs_max_pending, "Simultaneous requests to server for "
 				   "CIFS/SMB1 dialect (N/A for SMB3) "
 				   "Default: 32767 Range: 2 to 32767.");
+unsigned int dir_cache_timeout = 30;
+module_param(dir_cache_timeout, uint, 0644);
+MODULE_PARM_DESC(dir_cache_timeout, "Number of seconds to cache directory contents for which we have a lease. Default: 30 "
+				 "Range: 1 to 65000 seconds, 0 to disable caching dir contents");
 #ifdef CONFIG_CIFS_STATS2
 unsigned int slow_rsp_threshold = 1;
 module_param(slow_rsp_threshold, uint, 0644);
@@ -695,6 +699,8 @@ cifs_show_options(struct seq_file *s, struct dentry *root)
 		seq_printf(s, ",snapshot=%llu", tcon->snapshot_time);
 	if (tcon->handle_timeout)
 		seq_printf(s, ",handletimeout=%u", tcon->handle_timeout);
+	if (tcon->max_cached_dirs != MAX_CACHED_FIDS)
+		seq_printf(s, ",max_cached_dirs=%u", tcon->max_cached_dirs);
 
 	/*
 	 * Display file and directory attribute timeout in seconds.
@@ -1679,6 +1685,12 @@ init_cifs(void)
 			 CIFS_MAX_REQ);
 	}
 
+	/* Limit max to about 18 hours, and setting to zero disables directory entry caching */
+	if (dir_cache_timeout > 65000) {
+		dir_cache_timeout = 65000;
+		cifs_dbg(VFS, "dir_cache_timeout set to max of 65000 seconds\n");
+	}
+
 	cifsiod_wq = alloc_workqueue("cifsiod", WQ_FREEZABLE|WQ_MEM_RECLAIM, 0);
 	if (!cifsiod_wq) {
 		rc = -ENOMEM;

fs/smb/client/cifsfs.h

@@ -152,6 +152,6 @@ extern const struct export_operations cifs_export_ops;
 #endif /* CONFIG_CIFS_NFSD_EXPORT */
 
 /* when changing internal version - update following two lines at same time */
-#define SMB3_PRODUCT_BUILD 44
-#define CIFS_VERSION   "2.44"
+#define SMB3_PRODUCT_BUILD 45
+#define CIFS_VERSION   "2.45"
 #endif				/* _CIFSFS_H */

fs/smb/client/cifsglob.h

@@ -1210,6 +1210,7 @@ struct cifs_tcon {
 	__u32 max_chunks;
 	__u32 max_bytes_chunk;
 	__u32 max_bytes_copy;
+	__u32 max_cached_dirs;
 #ifdef CONFIG_CIFS_FSCACHE
 	u64 resource_id;		/* server resource id */
 	struct fscache_volume *fscache;	/* cookie for share */
@@ -2016,6 +2017,7 @@ extern unsigned int CIFSMaxBufSize;  /* max size not including hdr */
 extern unsigned int cifs_min_rcv;    /* min size of big ntwrk buf pool */
 extern unsigned int cifs_min_small;  /* min size of small buf pool */
 extern unsigned int cifs_max_pending; /* MAX requests at once to server*/
+extern unsigned int dir_cache_timeout; /* max time for directory lease caching of dir */
 extern bool disable_legacy_dialects;  /* forbid vers=1.0 and vers=2.0 mounts */
 extern atomic_t mid_count;
 

fs/smb/client/connect.c

@@ -2657,6 +2657,7 @@ cifs_get_tcon(struct cifs_ses *ses, struct smb3_fs_context *ctx)
 	tcon->retry = ctx->retry;
 	tcon->nocase = ctx->nocase;
 	tcon->broken_sparse_sup = ctx->no_sparse;
+	tcon->max_cached_dirs = ctx->max_cached_dirs;
 	if (ses->server->capabilities & SMB2_GLOBAL_CAP_DIRECTORY_LEASING)
 		tcon->nohandlecache = ctx->nohandlecache;
 	else

fs/smb/client/fs_context.c

@@ -150,6 +150,7 @@ const struct fs_parameter_spec smb3_fs_parameters[] = {
 	fsparam_u32("closetimeo", Opt_closetimeo),
 	fsparam_u32("echo_interval", Opt_echo_interval),
 	fsparam_u32("max_credits", Opt_max_credits),
+	fsparam_u32("max_cached_dirs", Opt_max_cached_dirs),
 	fsparam_u32("handletimeout", Opt_handletimeout),
 	fsparam_u64("snapshot", Opt_snapshot),
 	fsparam_u32("max_channels", Opt_max_channels),
@@ -1165,6 +1166,14 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
 		if (result.uint_32 > 1)
 			ctx->multichannel = true;
 		break;
+	case Opt_max_cached_dirs:
+		if (result.uint_32 < 1) {
+			cifs_errorf(fc, "%s: Invalid max_cached_dirs, needs to be 1 or more\n",
+				    __func__);
+			goto cifs_parse_mount_err;
+		}
+		ctx->max_cached_dirs = result.uint_32;
+		break;
 	case Opt_handletimeout:
 		ctx->handle_timeout = result.uint_32;
 		if (ctx->handle_timeout > SMB3_MAX_HANDLE_TIMEOUT) {
@@ -1592,7 +1601,7 @@ int smb3_init_fs_context(struct fs_context *fc)
 	ctx->acregmax = CIFS_DEF_ACTIMEO;
 	ctx->acdirmax = CIFS_DEF_ACTIMEO;
 	ctx->closetimeo = SMB3_DEF_DCLOSETIMEO;
-
+	ctx->max_cached_dirs = MAX_CACHED_FIDS;
 	/* Most clients set timeout to 0, allows server to use its default */
 	ctx->handle_timeout = 0; /* See MS-SMB2 spec section 2.2.14.2.12 */
 

fs/smb/client/fs_context.h

@@ -128,6 +128,7 @@ enum cifs_param {
 	Opt_closetimeo,
 	Opt_echo_interval,
 	Opt_max_credits,
+	Opt_max_cached_dirs,
 	Opt_snapshot,
 	Opt_max_channels,
 	Opt_handletimeout,
@@ -261,6 +262,7 @@ struct smb3_fs_context {
 	__u32 handle_timeout; /* persistent and durable handle timeout in ms */
 	unsigned int max_credits; /* smb3 max_credits 10 < credits < 60000 */
 	unsigned int max_channels;
+	unsigned int max_cached_dirs;
 	__u16 compression; /* compression algorithm 0xFFFF default 0=disabled */
 	bool rootfs:1; /* if it's a SMB root file system */
 	bool witness:1; /* use witness protocol */
@@ -287,7 +289,7 @@ extern void smb3_update_mnt_flags(struct cifs_sb_info *cifs_sb);
  */
 #define SMB3_MAX_DCLOSETIMEO (1 << 30)
 #define SMB3_DEF_DCLOSETIMEO (1 * HZ) /* even 1 sec enough to help eg open/write/close/open/read */
-
+#define MAX_CACHED_FIDS 16
 extern char *cifs_sanitize_prepath(char *prepath, gfp_t gfp);
 
 #endif

fs/smb/client/fscache.c

@@ -48,7 +48,7 @@ int cifs_fscache_get_super_cookie(struct cifs_tcon *tcon)
 	sharename = extract_sharename(tcon->tree_name);
 	if (IS_ERR(sharename)) {
 		cifs_dbg(FYI, "%s: couldn't extract sharename\n", __func__);
-		return -EINVAL;
+		return PTR_ERR(sharename);
 	}
 
 	slen = strlen(sharename);