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Commit fb1084e3 authored by Tom Haynes's avatar Tom Haynes Committed by Anna Schumaker
Browse files

nfs/flexfiles: Helper function to detect FF_FLAGS_NO_READ_IO 



The mds can inform the client not to use the IOMODE_RW layout
segment for doing READs. I.e., it is basically a
IOMODE_WRITE layout segment.

It would do this to not interfere with the WRITEs.

Signed-off-by: default avatarTom Haynes <loghyr@primarydata.com>
Signed-off-by: default avatarAnna Schumaker <Anna.Schumaker@Netapp.com>
parent ade8febd

fs/nfs/flexfilelayout/flexfilelayout.h

+10 −1
Original line number Diff line number Diff line
@@ -11,6 +11,7 @@ 


#define FF_FLAGS_NO_LAYOUTCOMMIT 1

#define FF_FLAGS_NO_IO_THRU_MDS  2

#define FF_FLAGS_NO_READ_IO      4



#include "../pnfs.h"
@@ -152,6 +153,12 @@ ff_layout_no_fallback_to_mds(struct pnfs_layout_segment *lseg) 
	return FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_IO_THRU_MDS;

}



static inline bool

ff_layout_no_read_on_rw(struct pnfs_layout_segment *lseg)

{

	return FF_LAYOUT_LSEG(lseg)->flags & FF_FLAGS_NO_READ_IO;

}



static inline bool

ff_layout_test_devid_unavailable(struct nfs4_deviceid_node *node)

{
@@ -192,4 +199,6 @@ struct rpc_cred *ff_layout_get_ds_cred(struct pnfs_layout_segment *lseg, 
				       u32 ds_idx, struct rpc_cred *mdscred);

bool ff_layout_has_available_ds(struct pnfs_layout_segment *lseg);

bool ff_layout_avoid_mds_available_ds(struct pnfs_layout_segment *lseg);

bool ff_layout_avoid_read_on_rw(struct pnfs_layout_segment *lseg);



#endif /* FS_NFS_NFS4FLEXFILELAYOUT_H */

fs/nfs/flexfilelayout/flexfilelayoutdev.c

+6 −0
Original line number Diff line number Diff line
@@ -557,6 +557,12 @@ bool ff_layout_avoid_mds_available_ds(struct pnfs_layout_segment *lseg) 
	       ff_layout_has_available_ds(lseg);

}



bool ff_layout_avoid_read_on_rw(struct pnfs_layout_segment *lseg)

{

	return lseg->pls_range.iomode == IOMODE_RW &&

	       ff_layout_no_read_on_rw(lseg);

}



module_param(dataserver_retrans, uint, 0644);

MODULE_PARM_DESC(dataserver_retrans, "The  number of times the NFSv4.1 client "

			"retries a request before it attempts further "