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authorLong Li <longli@microsoft.com>2017-11-22 17:38:45 -0700
committerSteve French <smfrench@gmail.com>2018-01-24 19:49:07 -0600
commitdb223a590d45b5e584a430c46a778699a5825cdd (patch)
tree8f4b315cdc6bcebc33aaae06f125d0f5e8e79ea4 /fs/cifs/cifsglob.h
parentc7398583340a6d82b8bb7f7f21edcde27dc6a898 (diff)
downloadlinux-db223a590d45b5e584a430c46a778699a5825cdd.tar.bz2
CIFS: SMBD: Upper layer performs SMB write via RDMA read through memory registration
When sending I/O, if size is larger than rdma_readwrite_threshold we prepare to send SMB write packet for a RDMA read via memory registration. The actual I/O is done by remote peer through local RDMA hardware. Modify the relevant fields in the packet accordingly, and append a smbd_buffer_descriptor_v1 to the end of the SMB write packet. On write I/O finish, deregister the memory region if this was for a RDMA read. If remote invalidation is not used, the call to smbd_deregister_mr will do local invalidation and possibly wait. Memory region is normally deregistered in MID callback as soon as it's used. There are situations where the MID may not be created on I/O failure, under which memory region is deregistered when write data context is released. Signed-off-by: Long Li <longli@microsoft.com> Signed-off-by: Steve French <smfrench@gmail.com> Reviewed-by: Pavel Shilovsky <pshilov@microsoft.com> Reviewed-by: Ronnie Sahlberg <lsahlber@redhat.com>
Diffstat (limited to 'fs/cifs/cifsglob.h')
-rw-r--r--fs/cifs/cifsglob.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/fs/cifs/cifsglob.h b/fs/cifs/cifsglob.h
index 573a7bef8817..29b5a9bd3128 100644
--- a/fs/cifs/cifsglob.h
+++ b/fs/cifs/cifsglob.h
@@ -1174,6 +1174,9 @@ struct cifs_writedata {
pid_t pid;
unsigned int bytes;
int result;
+#ifdef CONFIG_CIFS_SMB_DIRECT
+ struct smbd_mr *mr;
+#endif
unsigned int pagesz;
unsigned int tailsz;
unsigned int credits;