linux-stable.git/fs/nfs/flexfilelayout, branch linux-4.7.y

pNFS/flexfiles: Fix layoutstat periodic reporting

2016-10-07T13:21:25+00:00

commit 1c8d477a77e2d1d3504419e7f2e02e6422becf9a upstream.

Putting the periodicity timer in the mirror instances is causing
non-scalable reporting behaviour and missed reporting intervals.
When you recall layouts and/or implement client side mirroring, it
leads to consecutive reports with only a few ms between RPC calls.

Signed-off-by: Trond Myklebust 
Fixes: d0379a5d066a9 ("pNFS/flexfiles: Support server-supplied...")
Signed-off-by: Greg Kroah-Hartman

pNFS/flexfiles: Fix layoutcommit after a commit to DS

2016-10-07T13:21:24+00:00

commit c001c87a63aa2f35358e33eb05e45e4cbcb34f54 upstream.

We should always do a layoutcommit after commit to DS, except if
the layout segment we're using has set FF_FLAGS_NO_LAYOUTCOMMIT.

Fixes: d67ae825a59d ("pnfs/flexfiles: Add the FlexFile Layout Driver")
Signed-off-by: Trond Myklebust 
Signed-off-by: Greg Kroah-Hartman

pNFS/flexfiles: Fix an Oopsable condition when connection to the DS fails

2016-09-24T08:09:27+00:00

commit 3dc147359e3dcdf0648f1e2c11f62cfae3160df0 upstream.

If the attempt to connect to a DS fails inside ff_layout_pg_init_read or
ff_layout_pg_init_write, then we currently end up clearing the layout
segment carried by the struct nfs_pageio_descriptor, causing an Oops
when we later call into ff_layout_read_pagelist/ff_layout_write_pagelist.

The fix is to ensure we return the layout and then retry.

Fixes: 446ca2195303 ("pNFS/flexfiles: When initing reads or writes, we...")
Signed-off-by: Trond Myklebust 
Signed-off-by: Greg Kroah-Hartman

pnfs: pnfs_update_layout needs to consider if strict iomode checking is on

2016-05-26T12:40:56+00:00

As flexfiles has FF_FLAGS_NO_READ_IO, there is a need to generically
support enforcing that a IOMODE_RW segment will not allow READ I/O.

Signed-off-by: Tom Haynes 
Signed-off-by: Anna Schumaker

nfs/flexfiles: Use the layout segment for reading unless it a IOMODE_RW and reading is disabled

2016-05-26T12:40:51+00:00

Signed-off-by: Tom Haynes 
Signed-off-by: Anna Schumaker

nfs/flexfiles: Helper function to detect FF_FLAGS_NO_READ_IO

2016-05-25T17:35:20+00:00

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 
Signed-off-by: Anna Schumaker

flexfiles: add kerneldoc header to nfs4_ff_layout_prepare_ds

2016-05-17T19:48:11+00:00

Signed-off-by: Jeff Layton 
Signed-off-by: Anna Schumaker

flexfiles: remove pointless setting of NFS_LAYOUT_RETURN_REQUESTED

2016-05-17T19:48:11+00:00

Setting just the NFS_LAYOUT_RETURN_REQUESTED flag doesn't do anything,
unless there are lsegs that are also being marked for return. At the
point where that happens this flag is also set, so these set_bit calls
don't do anything useful.

Signed-off-by: Jeff Layton 
Signed-off-by: Anna Schumaker

pnfs: don't merge new ff lsegs with ones that have LAYOUTRETURN bit set

2016-05-17T19:48:09+00:00

Otherwise, we'll end up returning layouts that we've just received if
the client issues a new LAYOUTGET prior to the LAYOUTRETURN.

Signed-off-by: Jeff Layton 
Signed-off-by: Anna Schumaker

pNFS/flexfiles: When initing reads or writes, we might have to retry connecting to DSes

2016-05-17T19:48:08+00:00

If we are initializing reads or writes and can not connect to a DS, then
check whether or not IO is allowed through the MDS. If it is allowed,
reset to the MDS. Else, fail the layout segment and force a retry
of a new layout segment.

Signed-off-by: Tom Haynes 
Signed-off-by: Anna Schumaker