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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: Tom Haynes <loghyr@primarydata.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Tom Haynes 2016-05-25 07:31:12 -07:00 committed by Anna Schumaker
parent ade8febde0
commit fb1084e332
2 changed files with 16 additions and 1 deletions
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11
fs/nfs/flexfilelayout/flexfilelayout.h
View File

@ -10,7 +10,8 @@
#define FS_NFS_NFS4FLEXFILELAYOUT_H
#define FF_FLAGS_NO_LAYOUTCOMMIT 1
#define FF_FLAGS_NO_IO_THRU_MDS 2
#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 */

6
fs/nfs/flexfilelayout/flexfilelayoutdev.c
View File

@ -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 "