Commit bcc88801 authored by Aurelien Aptel's avatar Aurelien Aptel Committed by Steve French
Browse files

cifs: add multichannel mount options and data structs 



adds:
- [no]multichannel to enable/disable multichannel
- max_channels=N to control how many channels to create

these options are then stored in the volume struct.

- store channels and max_channels in cifs_ses

Signed-off-by: default avatarAurelien Aptel <aaptel@suse.com>
Signed-off-by: default avatarSteve French <stfrench@microsoft.com>
parent 35adffed

fs/cifs/cifsfs.c

+4 −0
Original line number Diff line number Diff line
@@ -613,6 +613,10 @@ cifs_show_options(struct seq_file *s, struct dentry *root) 
	/* convert actimeo and display it in seconds */

	seq_printf(s, ",actimeo=%lu", cifs_sb->actimeo / HZ);



	if (tcon->ses->chan_max > 1)

		seq_printf(s, ",multichannel,max_channel=%zu",

			   tcon->ses->chan_max);



	return 0;

}

fs/cifs/cifsglob.h

+16 −0
Original line number Diff line number Diff line
@@ -591,6 +591,10 @@ struct smb_vol { 
	bool resilient:1; /* noresilient not required since not fored for CA */

	bool domainauto:1;

	bool rdma:1;

	bool multichannel:1;

	bool use_client_guid:1;

	/* reuse existing guid for multichannel */

	u8 client_guid[SMB2_CLIENT_GUID_SIZE];

	unsigned int bsize;

	unsigned int rsize;

	unsigned int wsize;
@@ -607,6 +611,7 @@ struct smb_vol { 
	__u64 snapshot_time; /* needed for timewarp tokens */

	__u32 handle_timeout; /* persistent and durable handle timeout in ms */

	unsigned int max_credits; /* smb3 max_credits 10 < credits < 60000 */

	unsigned int max_channels;

	__u16 compression; /* compression algorithm 0xFFFF default 0=disabled */

	bool rootfs:1; /* if it's a SMB root file system */

};
@@ -953,6 +958,11 @@ struct cifs_server_iface { 
	struct sockaddr_storage sockaddr;

};



struct cifs_chan {

	struct TCP_Server_Info *server;

	__u8 signkey[SMB3_SIGN_KEY_SIZE];

};



/*

 * Session structure.  One of these for each uid session with a particular host

 */
@@ -1002,6 +1012,12 @@ struct cifs_ses { 
	struct cifs_server_iface *iface_list;

	size_t iface_count;

	unsigned long iface_last_update; /* jiffies */



#define CIFS_MAX_CHANNELS 16

	struct cifs_chan chans[CIFS_MAX_CHANNELS];

	size_t chan_count;

	size_t chan_max;

	atomic_t chan_seq; /* round robin state */

};



static inline bool

fs/cifs/connect.c

+36 −2
Original line number Diff line number Diff line
@@ -97,6 +97,7 @@ enum { 
	Opt_persistent, Opt_nopersistent,

	Opt_resilient, Opt_noresilient,

	Opt_domainauto, Opt_rdma, Opt_modesid, Opt_rootfs,

	Opt_multichannel, Opt_nomultichannel,

	Opt_compress,



	/* Mount options which take numeric value */
@@ -106,7 +107,7 @@ enum { 
	Opt_min_enc_offload,

	Opt_blocksize, Opt_rsize, Opt_wsize, Opt_actimeo,

	Opt_echo_interval, Opt_max_credits, Opt_handletimeout,

	Opt_snapshot,

	Opt_snapshot, Opt_max_channels,



	/* Mount options which take string value */

	Opt_user, Opt_pass, Opt_ip,
@@ -199,6 +200,8 @@ static const match_table_t cifs_mount_option_tokens = { 
	{ Opt_noresilient, "noresilienthandles"},

	{ Opt_domainauto, "domainauto"},

	{ Opt_rdma, "rdma"},

	{ Opt_multichannel, "multichannel" },

	{ Opt_nomultichannel, "nomultichannel" },



	{ Opt_backupuid, "backupuid=%s" },

	{ Opt_backupgid, "backupgid=%s" },
@@ -218,6 +221,7 @@ static const match_table_t cifs_mount_option_tokens = { 
	{ Opt_echo_interval, "echo_interval=%s" },

	{ Opt_max_credits, "max_credits=%s" },

	{ Opt_snapshot, "snapshot=%s" },

	{ Opt_max_channels, "max_channels=%s" },

	{ Opt_compress, "compress=%s" },



	{ Opt_blank_user, "user=" },
@@ -1681,6 +1685,10 @@ cifs_parse_mount_options(const char *mountdata, const char *devname, 


	vol->echo_interval = SMB_ECHO_INTERVAL_DEFAULT;



	/* default to no multichannel (single server connection) */

	vol->multichannel = false;

	vol->max_channels = 1;



	if (!mountdata)

		goto cifs_parse_mount_err;
@@ -1974,6 +1982,12 @@ cifs_parse_mount_options(const char *mountdata, const char *devname, 
		case Opt_rdma:

			vol->rdma = true;

			break;

		case Opt_multichannel:

			vol->multichannel = true;

			break;

		case Opt_nomultichannel:

			vol->multichannel = false;

			break;

		case Opt_compress:

			vol->compression = UNKNOWN_TYPE;

			cifs_dbg(VFS,
@@ -2137,6 +2151,15 @@ cifs_parse_mount_options(const char *mountdata, const char *devname, 
			}

			vol->max_credits = option;

			break;

		case Opt_max_channels:

			if (get_option_ul(args, &option) || option < 1 ||

				option > CIFS_MAX_CHANNELS) {

				cifs_dbg(VFS, "%s: Invalid max_channels value, needs to be 1-%d\n",

					 __func__, CIFS_MAX_CHANNELS);

				goto cifs_parse_mount_err;

			}

			vol->max_channels = option;

			break;



		/* String Arguments */
@@ -2781,6 +2804,10 @@ cifs_get_tcp_session(struct smb_vol *volume_info) 
	       sizeof(tcp_ses->srcaddr));

	memcpy(&tcp_ses->dstaddr, &volume_info->dstaddr,

		sizeof(tcp_ses->dstaddr));

	if (volume_info->use_client_guid)

		memcpy(tcp_ses->client_guid, volume_info->client_guid,

		       SMB2_CLIENT_GUID_SIZE);

	else

		generate_random_uuid(tcp_ses->client_guid);

	/*

	 * at this point we are the only ones with the pointer
@@ -2870,6 +2897,13 @@ static int match_session(struct cifs_ses *ses, struct smb_vol *vol) 
	    vol->sectype != ses->sectype)

		return 0;



	/*

	 * If an existing session is limited to less channels than

	 * requested, it should not be reused

	 */

	if (ses->chan_max < vol->max_channels)

		return 0;



	switch (ses->sectype) {

	case Kerberos:

		if (!uid_eq(vol->cred_uid, ses->cred_uid))

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