cifs: move [brw]size from cifs_sb to cifs_sb->ctx

Signed-off-by: Ronnie Sahlberg <lsahlber@redhat.com>
Signed-off-by: Steve French <stfrench@microsoft.com>

fs/cifs/cifs_fs_sb.h

@@ -62,9 +62,6 @@ struct cifs_sb_info {
 	struct tcon_link *master_tlink;
 	struct nls_table *local_nls;
 	struct smb3_fs_context *ctx;
-	unsigned int bsize;
-	unsigned int rsize;
-	unsigned int wsize;
 	atomic_t active;
 	unsigned int mnt_cifs_flags;
 	struct delayed_work prune_tlinks;

fs/cifs/cifsfs.c

@@ -218,7 +218,7 @@ cifs_read_super(struct super_block *sb)
 	if (rc)
 		goto out_no_root;
 	/* tune readahead according to rsize */
-	sb->s_bdi->ra_pages = cifs_sb->rsize / PAGE_SIZE;
+	sb->s_bdi->ra_pages = cifs_sb->ctx->rsize / PAGE_SIZE;
 
 	sb->s_blocksize = CIFS_MAX_MSGSIZE;
 	sb->s_blocksize_bits = 14;	/* default 2**14 = CIFS_MAX_MSGSIZE */
@@ -615,9 +615,12 @@ cifs_show_options(struct seq_file *s, struct dentry *root)
 			   from_kgid_munged(&init_user_ns,
 					    cifs_sb->ctx->backupgid));
 
-	seq_printf(s, ",rsize=%u", cifs_sb->rsize);
-	seq_printf(s, ",wsize=%u", cifs_sb->wsize);
-	seq_printf(s, ",bsize=%u", cifs_sb->bsize);
+	if (cifs_sb->ctx->got_rsize)
+		seq_printf(s, ",rsize=%u", cifs_sb->ctx->rsize);
+	if (cifs_sb->ctx->got_wsize)
+		seq_printf(s, ",wsize=%u", cifs_sb->ctx->wsize);
+	if (cifs_sb->ctx->got_bsize)
+		seq_printf(s, ",bsize=%u", cifs_sb->ctx->bsize);
 	if (tcon->ses->server->min_offload)
 		seq_printf(s, ",esize=%u", tcon->ses->server->min_offload);
 	seq_printf(s, ",echo_interval=%lu",

fs/cifs/connect.c

@@ -2248,10 +2248,10 @@ compare_mount_options(struct super_block *sb, struct cifs_mnt_data *mnt_data)
 	 * We want to share sb only if we don't specify an r/wsize or
 	 * specified r/wsize is greater than or equal to existing one.
 	 */
-	if (new->wsize && new->wsize < old->wsize)
+	if (new->ctx->wsize && new->ctx->wsize < old->ctx->wsize)
 		return 0;
 
-	if (new->rsize && new->rsize < old->rsize)
+	if (new->ctx->rsize && new->ctx->rsize < old->ctx->rsize)
 		return 0;
 
 	if (!uid_eq(old->ctx->linux_uid, new->ctx->linux_uid) ||
@@ -2714,14 +2714,6 @@ int cifs_setup_cifs_sb(struct smb3_fs_context *ctx,
 	spin_lock_init(&cifs_sb->tlink_tree_lock);
 	cifs_sb->tlink_tree = RB_ROOT;
 
-	cifs_sb->bsize = ctx->bsize;
-	/*
-	 * Temporarily set r/wsize for matching superblock. If we end up using
-	 * new sb then client will later negotiate it downward if needed.
-	 */
-	cifs_sb->rsize = ctx->rsize;
-	cifs_sb->wsize = ctx->wsize;
-
 	cifs_dbg(FYI, "file mode: %04ho  dir mode: %04ho\n",
 		 cifs_sb->ctx->file_mode, cifs_sb->ctx->dir_mode);
 
@@ -2925,8 +2917,13 @@ static int mount_get_conns(struct smb3_fs_context *ctx, struct cifs_sb_info *cif
 		}
 	}
 
-	cifs_sb->wsize = server->ops->negotiate_wsize(tcon, ctx);
-	cifs_sb->rsize = server->ops->negotiate_rsize(tcon, ctx);
+	/*
+	 * Clamp the rsize/wsize mount arguments if they are too big for the server
+	 */
+	if (cifs_sb->ctx->wsize > server->ops->negotiate_wsize(tcon, ctx))
+		cifs_sb->ctx->wsize = server->ops->negotiate_wsize(tcon, ctx);
+	if (cifs_sb->ctx->rsize > server->ops->negotiate_rsize(tcon, ctx))
+		cifs_sb->ctx->rsize = server->ops->negotiate_rsize(tcon, ctx);
 
 	return 0;
 }

fs/cifs/file.c

@@ -2336,7 +2336,7 @@ static int cifs_writepages(struct address_space *mapping,
 	 * If wsize is smaller than the page cache size, default to writing
 	 * one page at a time via cifs_writepage
 	 */
-	if (cifs_sb->wsize < PAGE_SIZE)
+	if (cifs_sb->ctx->wsize < PAGE_SIZE)
 		return generic_writepages(mapping, wbc);
 
 	xid = get_xid();
@@ -2369,7 +2369,7 @@ static int cifs_writepages(struct address_space *mapping,
 		if (rc)
 			get_file_rc = rc;
 
-		rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize,
+		rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->wsize,
 						   &wsize, credits);
 		if (rc != 0) {
 			done = true;
@@ -2911,7 +2911,7 @@ cifs_write_from_iter(loff_t offset, size_t len, struct iov_iter *from,
 				break;
 		}
 
-		rc = server->ops->wait_mtu_credits(server, cifs_sb->wsize,
+		rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->wsize,
 						   &wsize, credits);
 		if (rc)
 			break;
@@ -3642,7 +3642,7 @@ cifs_send_async_read(loff_t offset, size_t len, struct cifsFileInfo *open_file,
 				break;
 		}
 
-		rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize,
+		rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize,
 						   &rsize, credits);
 		if (rc)
 			break;
@@ -4028,7 +4028,7 @@ cifs_read(struct file *file, char *read_data, size_t read_size, loff_t *offset)
 	cifs_sb = CIFS_FILE_SB(file);
 
 	/* FIXME: set up handlers for larger reads and/or convert to async */
-	rsize = min_t(unsigned int, cifs_sb->rsize, CIFSMaxBufSize);
+	rsize = min_t(unsigned int, cifs_sb->ctx->rsize, CIFSMaxBufSize);
 
 	if (file->private_data == NULL) {
 		rc = -EBADF;
@@ -4413,7 +4413,7 @@ static int cifs_readpages(struct file *file, struct address_space *mapping,
 				break;
 		}
 
-		rc = server->ops->wait_mtu_credits(server, cifs_sb->rsize,
+		rc = server->ops->wait_mtu_credits(server, cifs_sb->ctx->rsize,
 						   &rsize, credits);
 		if (rc)
 			break;

fs/cifs/fs_context.c

@@ -784,12 +784,15 @@ static int smb3_fs_context_parse_param(struct fs_context *fc,
 			goto cifs_parse_mount_err;
 		}
 		ctx->bsize = result.uint_32;
+		ctx->got_bsize = true;
 		break;
 	case Opt_rsize:
 		ctx->rsize = result.uint_32;
+		ctx->got_rsize = true;
 		break;
 	case Opt_wsize:
 		ctx->wsize = result.uint_32;
+		ctx->got_wsize = true;
 		break;
 	case Opt_actimeo:
 		ctx->actimeo = HZ * result.uint_32;

fs/cifs/fs_context.h

@@ -152,6 +152,9 @@ struct smb3_fs_context {
 	char *nodename;
 	bool got_ip;
 	bool got_version;
+	bool got_rsize;
+	bool got_wsize;
+	bool got_bsize;
 	unsigned short port;
 
 	char *username;

fs/cifs/inode.c

@@ -2409,7 +2409,7 @@ int cifs_getattr(const struct path *path, struct kstat *stat,
 	}
 
 	generic_fillattr(inode, stat);
-	stat->blksize = cifs_sb->bsize;
+	stat->blksize = cifs_sb->ctx->bsize;
 	stat->ino = CIFS_I(inode)->uniqueid;
 
 	/* old CIFS Unix Extensions doesn't return create time */

fs/cifs/smb1ops.c

@@ -1006,7 +1006,7 @@ cifs_is_read_op(__u32 oplock)
 static unsigned int
 cifs_wp_retry_size(struct inode *inode)
 {
-	return CIFS_SB(inode->i_sb)->wsize;
+	return CIFS_SB(inode->i_sb)->ctx->wsize;
 }
 
 static bool

fs/cifs/smb2ops.c

@@ -3951,7 +3951,7 @@ smb3_parse_lease_buf(void *buf, unsigned int *epoch, char *lease_key)
 static unsigned int
 smb2_wp_retry_size(struct inode *inode)
 {
-	return min_t(unsigned int, CIFS_SB(inode->i_sb)->wsize,
+	return min_t(unsigned int, CIFS_SB(inode->i_sb)->ctx->wsize,
 		     SMB2_MAX_BUFFER_SIZE);
 }