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authorTrond Myklebust <trond.myklebust@hammerspace.com>2019-07-16 15:38:28 -0400
committerTrond Myklebust <trond.myklebust@hammerspace.com>2019-07-18 14:43:52 -0400
commitd9aba2b40de6fddd83f2fe3a5ac2bcd2c98fa66b (patch)
treeb69a831696a3769da3fcbe28f5957b83dbfc18d5 /fs/nfs
parent7402a4fedc2bc448100c2d086406c708451b16dc (diff)
downloadlinux-stericsson-d9aba2b40de6fddd83f2fe3a5ac2bcd2c98fa66b.tar.gz
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>
Diffstat (limited to 'fs/nfs')
-rw-r--r--fs/nfs/nfs4state.c3
-rw-r--r--fs/nfs/pnfs.c14
2 files changed, 12 insertions, 5 deletions
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index f32b02c2bc73..9afd051a4876 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -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;
diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 56e423cd8180..5b9145c62fd9 100644
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -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);