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NFS/flexfiles: Avoid unnecessary layout invalidations

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In ff_layout_mirror_valid() we may not want to invalidate the layout
segment despite the call to GETDEVICEINFO failing. The reason is that
a read may still be able to make progress on another mirror.

So instead we let the caller (in this case nfs4_ff_layout_prepare_ds())
decide whether or not it needs to invalidate.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2019-02-27 23:46:04 -05:00
parent 2444ff277a
commit 0a156dd582
1 changed files with 3 additions and 3 deletions
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6
fs/nfs/flexfilelayout/flexfilelayoutdev.c
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@ -196,7 +196,7 @@ static bool ff_layout_mirror_valid(struct pnfs_layout_segment *lseg,
struct nfs4_ff_layout_mirror *mirror,
bool create)
{
if (mirror == NULL || IS_ERR(mirror->mirror_ds))
if (mirror == NULL)
goto outerr;
if (mirror->mirror_ds == NULL) {
if (create) {
@ -229,7 +229,6 @@ static bool ff_layout_mirror_valid(struct pnfs_layout_segment *lseg,
}
return true;
outerr:
pnfs_error_mark_layout_for_return(lseg->pls_layout->plh_inode, lseg);
return false;
}
@ -417,7 +416,7 @@ nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg,
int status;
if (!ff_layout_mirror_valid(lseg, mirror, true))
goto out;
goto noconnect;
ds = mirror->mirror_ds->ds;
/* matching smp_wmb() in _nfs4_pnfs_v3/4_ds_connect */
@ -444,6 +443,7 @@ nfs4_ff_layout_prepare_ds(struct pnfs_layout_segment *lseg,
mirror->mirror_ds->ds_versions[0].wsize = max_payload;
goto out;
}
noconnect:
ff_layout_track_ds_error(FF_LAYOUT_FROM_HDR(lseg->pls_layout),
mirror, lseg->pls_range.offset,
lseg->pls_range.length, NFS4ERR_NXIO,