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scoutfs-utils: add support for unmount_barrier

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Signed-off-by: Zach Brown <zab@versity.com>
This commit is contained in:
Zach Brown
2019-04-12 10:54:20 -07:00
committed by Zach Brown
parent a9b46213b3
commit 514418421c
2 changed files with 53 additions and 2 deletions
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utils/src/format.h
+27 -1
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@@ -48,6 +48,8 @@
#define SCOUTFS_QUORUM_BLOCKS ((128ULL * 1024) >> SCOUTFS_BLOCK_SHIFT)
#define SCOUTFS_QUORUM_MAX_SLOTS SCOUTFS_QUORUM_BLOCKS
#define SCOUTFS_UNIQUE_NAME_MAX_BYTES 64 /* includes null */
/*
* Base types used by other structures.
*/
@@ -289,6 +291,18 @@ struct scoutfs_trans_seq_btree_key {
__be64 node_id;
} __packed;
/*
* The server keeps a persistent record of mounted clients.
*/
struct scoutfs_mounted_client_btree_key {
__be64 node_id;
} __packed;
struct scoutfs_mounted_client_btree_val {
__u8 name[SCOUTFS_UNIQUE_NAME_MAX_BYTES];
} __packed;
/*
* The max number of links defines the max number of entries that we can
* index in o(log n) and the static list head storage size in the
@@ -395,7 +409,6 @@ struct scoutfs_xattr {
#define member_sizeof(TYPE, MEMBER) (sizeof(((TYPE *)0)->MEMBER))
#define SCOUTFS_UUID_BYTES 16
#define SCOUTFS_UNIQUE_NAME_MAX_BYTES 64 /* includes null */
/*
* During each quorum voting interval the fabric has to process 2 reads
@@ -418,6 +431,7 @@ struct scoutfs_xattr {
* @config_gen: references the config gen in the super block
* @write_nr: incremented for every write, only 0 when never written
* @elected_nr: incremented when elected, 0 otherwise
* @unmount_barrier: incremented by servers when all members have unmounted
* @vote_slot: the active config slot that the writer is voting for
*/
struct scoutfs_quorum_block {
@@ -426,6 +440,7 @@ struct scoutfs_quorum_block {
__le64 config_gen;
__le64 write_nr;
__le64 elected_nr;
__le64 unmount_barrier;
__le32 crc;
__u8 vote_slot;
} __packed;
@@ -475,6 +490,7 @@ struct scoutfs_super_block {
struct scoutfs_quorum_config quorum_config;
struct scoutfs_btree_root lock_clients;
struct scoutfs_btree_root trans_seqs;
struct scoutfs_btree_root mounted_clients;
} __packed;
#define SCOUTFS_ROOT_INO 1
@@ -593,20 +609,30 @@ enum {
* Greetings verify identity of communicating nodes. The sender sends
* their credentials and the receiver verifies them.
*
* @name: The client sends its unique name to the server.
*
* @server_term: The raft term that elected the server. Initially 0
* from the client, sent by the server, then sent by the client as it
* tries to reconnect. Used to identify a client reconnecting to a
* server that has timed out its connection.
*
* @unmount_barrier: Incremented every time the remaining majority of
* quorum members all agree to leave. The server tells a quorum member
* the value that it's connecting under so that if the client sees the
* value increase in a quorum block it knows that the server has
* processed its farewell and can safely unmount.
*
* @node_id: The id of the client. Initially 0 from the client,
* assigned by the server, and sent by the client as it reconnects.
* Used by the server to identify reconnecting clients whose existing
* state must be dealt with.
*/
struct scoutfs_net_greeting {
__u8 name[SCOUTFS_UNIQUE_NAME_MAX_BYTES];
__le64 fsid;
__le64 format_hash;
__le64 server_term;
__le64 unmount_barrier;
__le64 node_id;
__le64 flags;
} __packed;