kernel/fs/nfs/flexfilelayout/flexfilelayout.c, branch linux-5.1.y

pNFS/flexfiles: Fix layoutstats handling during read failovers

2019-03-23T16:03:58Z

During a read failover, we may end up changing the value of the pgio_mirror_idx, so make sure that we record the layout stats before that update. Signed-off-by: Trond Myklebust

NFS/flexfile: Simplify nfs4_ff_layout_select_ds_stateid()

2019-03-02T03:37:38Z

Pass in a pointer to the mirror rather than forcing another array access. Signed-off-by: Trond Myklebust

NFS/flexfile: Simplify nfs4_ff_layout_ds_version()

2019-03-02T03:37:38Z

Pass in a pointer to the mirror rather than forcing another array access. Signed-off-by: Trond Myklebust

NFS/flexfiles: Simplify ff_layout_get_ds_cred()

2019-03-02T03:37:38Z

Pass in a pointer to the mirror rather than forcing another array access. Signed-off-by: Trond Myklebust

NFS/flexfiles: Simplify nfs4_ff_find_or_create_ds_client()

2019-03-02T03:37:38Z

Pass in a pointer to the mirror rather than forcing another array access. Signed-off-by: Trond Myklebust

NFS/flexfiles: Simplify nfs4_ff_layout_select_ds_fh()

2019-03-02T03:37:38Z

Pass in a pointer to the mirror rather than having to retrieve it from the array and then verify the resulting pointer. Signed-off-by: Trond Myklebust

NFS/flexfiles: Speed up read failover when DSes are down

2019-03-02T03:37:38Z

If we notice that a DS may be down, we should attempt to read from the other mirrors first before we go back to retry the dead DS. Signed-off-by: Trond Myklebust

NFS/flexfiles: Remove bogus checks for invalid deviceids

2019-03-02T03:37:38Z

We already check the deviceids before we start the RPC call. Signed-off-by: Trond Myklebust

NFS/flexfiles: refactor calls to fs4_ff_layout_prepare_ds()

2019-03-02T03:37:37Z

While we may want to skip attempting to connect to a downed mirror when we're deciding which mirror to select for a read, we do not want to do so once we've committed to attempting the I/O in ff_layout_read/write_pagelist(), or ff_layout_initiate_commit() Signed-off-by: Trond Myklebust

NFS/flexfiles: Send LAYOUTERROR when failing over mirrored reads

2019-03-02T03:37:37Z

When a read to the preferred mirror returns an error, the flexfiles driver records the error in the inode list and currently marks the layout for return before failing over the attempted read to the next mirror. What we actually want to do is fire off a LAYOUTERROR to notify the MDS that there is an issue with the preferred mirror, then we fail over. Only once we've failed to read from all mirrors should we return the layout. Signed-off-by: Trond Myklebust