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NFSv4: Don't use the zero stateid with layoutget 

The NFSv4.1 protocol explicitly forbids us from using the zero stateid
together with layoutget, so when we see that nfs4_select_rw_stateid()
is unable to return a valid delegation, lock or open stateid, then
we should initiate recovery and retry.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
This commit is contained in:
Trond Myklebust 2019-07-16 15:38:28 -04:00
parent 7402a4fedc
commit d9aba2b40d
2 changed files with 12 additions and 5 deletions
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3
fs/nfs/nfs4state.c
View File

@ -1064,8 +1064,7 @@ int nfs4_select_rw_stateid(struct nfs4_state *state,
* choose to use.
*/
goto out;
nfs4_copy_open_stateid(dst, state);
ret = 0;
ret = nfs4_copy_open_stateid(dst, state) ? 0 : -EAGAIN;
out:
if (nfs_server_capable(state->inode, NFS_CAP_STATEID_NFSV41))
dst->seqid = 0;

14
fs/nfs/pnfs.c
View File

@ -1915,6 +1915,7 @@ lookup_again:
* stateid.
*/
if (test_bit(NFS_LAYOUT_INVALID_STID, &lo->plh_flags)) {
int status;
/*
* The first layoutget for the file. Need to serialize per
@ -1934,13 +1935,20 @@ lookup_again:
}
first = true;
if (nfs4_select_rw_stateid(ctx->state,
status = nfs4_select_rw_stateid(ctx->state,
iomode == IOMODE_RW ? FMODE_WRITE : FMODE_READ,
NULL, &stateid, NULL) != 0) {
NULL, &stateid, NULL);
if (status != 0) {
trace_pnfs_update_layout(ino, pos, count,
iomode, lo, lseg,
PNFS_UPDATE_LAYOUT_INVALID_OPEN);
goto out_unlock;
if (status != -EAGAIN)
goto out_unlock;
spin_unlock(&ino->i_lock);
nfs4_schedule_stateid_recovery(server, ctx->state);
pnfs_clear_first_layoutget(lo);
pnfs_put_layout_hdr(lo);
goto lookup_again;
}
} else {
nfs4_stateid_copy(&stateid, &lo->plh_stateid);