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CIFS: Introduce credit-based flow control

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and send no more than credits value requests at once. For SMB/CIFS
it's trivial: increment this value by receiving any message and
decrement by sending one.

Reviewed-by: Jeff Layton <jlayton@redhat.com>
Signed-off-by: Pavel Shilovsky <piastry@etersoft.ru>
Signed-off-by: Steve French <sfrench@us.ibm.com>
This commit is contained in:
Pavel Shilovsky
2012-02-06 15:59:18 +04:00
committed by Steve French
parent fc40f9cf82
commit 2d86dbc970
6 changed files with 60 additions and 44 deletions
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19
fs/cifs/misc.c
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@@ -690,3 +690,22 @@ backup_cred(struct cifs_sb_info *cifs_sb)
return false;
}
void
cifs_add_credits(struct TCP_Server_Info *server, const unsigned int add)
{
spin_lock(&server->req_lock);
server->credits += add;
server->in_flight--;
spin_unlock(&server->req_lock);
wake_up(&server->request_q);
}
void
cifs_set_credits(struct TCP_Server_Info *server, const int val)
{
spin_lock(&server->req_lock);
server->credits = val;
server->oplocks = val > 1 ? enable_oplocks : false;
spin_unlock(&server->req_lock);
}