The Linux NFS client must distinguish between referral events (which
it currently supports) and migration events (which it does not yet
support).
In both types of events, an fs_locations array is returned. But upper
layers, not the XDR layer, should make the distinction between a
referral and a migration. There really isn't a way for an XDR decoder
function to distinguish the two, in general.
Slightly adjust the FATTR flags returned by decode_fs_locations()
to set NFS_ATTR_FATTR_V4_LOCATIONS only if a non-empty locations
array was returned from the server. Then have logic in nfs4proc.c
distinguish whether the locations array is for a referral or
something else.
Signed-off-by: Chuck Lever <chuck.lever@xxxxxxxxxx>
---
fs/nfs/nfs4proc.c | 6 +++---
fs/nfs/nfs4xdr.c | 2 +-
include/linux/nfs_xdr.h | 7 ++++---
3 files changed, 8 insertions(+), 7 deletions(-)
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 5629858..aa0d2cd 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -75,6 +75,7 @@ static int _nfs4_proc_open(struct nfs4_opendata *data);
static int _nfs4_recover_proc_open(struct nfs4_opendata *data);
static int nfs4_do_fsinfo(struct nfs_server *, struct nfs_fh *, struct nfs_fsinfo *);
static int nfs4_async_handle_error(struct rpc_task *, const struct nfs_server *, struct nfs4_state *);
+static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
static int _nfs4_proc_getattr(struct nfs_server *server, struct nfs_fh *fhandle, struct nfs_fattr *fattr);
static int nfs4_do_setattr(struct inode *inode, struct rpc_cred *cred,
struct nfs_fattr *fattr, struct iattr *sattr,
@@ -2301,7 +2302,6 @@ static int nfs4_proc_get_root(struct nfs_server *server, struct nfs_fh *fhandle,
return nfs4_map_errors(status);
}
-static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr);
/*
* Get locations and (maybe) other attributes of a referral.
* Note that we'll actually follow the referral later when
@@ -4707,11 +4707,11 @@ static void nfs_fixup_referral_attributes(struct nfs_fattr *fattr)
if (!(((fattr->valid & NFS_ATTR_FATTR_MOUNTED_ON_FILEID) ||
(fattr->valid & NFS_ATTR_FATTR_FILEID)) &&
(fattr->valid & NFS_ATTR_FATTR_FSID) &&
- (fattr->valid & NFS_ATTR_FATTR_V4_REFERRAL)))
+ (fattr->valid & NFS_ATTR_FATTR_V4_LOCATIONS)))
return;
fattr->valid |= NFS_ATTR_FATTR_TYPE | NFS_ATTR_FATTR_MODE |
- NFS_ATTR_FATTR_NLINK;
+ NFS_ATTR_FATTR_NLINK | NFS_ATTR_FATTR_V4_REFERRAL;
fattr->mode = S_IFDIR | S_IRUGO | S_IXUGO;
fattr->nlink = 2;
}
diff --git a/fs/nfs/nfs4xdr.c b/fs/nfs/nfs4xdr.c
index 16ee1cf..6b1052a 100644
--- a/fs/nfs/nfs4xdr.c
+++ b/fs/nfs/nfs4xdr.c
@@ -3614,7 +3614,7 @@ static int decode_attr_fs_locations(struct xdr_stream *xdr, uint32_t *bitmap, st
res->nlocations++;
}
if (res->nlocations != 0)
- status = NFS_ATTR_FATTR_V4_REFERRAL;
+ status = NFS_ATTR_FATTR_V4_LOCATIONS;
out:
dprintk("%s: fs_locations done, error = %d\n", __func__, status);
return status;
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index d409f1c..d609631 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -89,9 +89,10 @@ struct nfs_fattr {
#define NFS_ATTR_FATTR_PRECTIME (1U << 16)
#define NFS_ATTR_FATTR_CHANGE (1U << 17)
#define NFS_ATTR_FATTR_PRECHANGE (1U << 18)
-#define NFS_ATTR_FATTR_V4_REFERRAL (1U << 19) /* NFSv4 referral */
-#define NFS_ATTR_FATTR_MOUNTPOINT (1U << 20) /* Treat as mountpoint */
-#define NFS_ATTR_FATTR_MOUNTED_ON_FILEID (1U << 21)
+#define NFS_ATTR_FATTR_V4_LOCATIONS (1U << 19)
+#define NFS_ATTR_FATTR_V4_REFERRAL (1U << 20) /* NFSv4 referral */
+#define NFS_ATTR_FATTR_MOUNTPOINT (1U << 21) /* Treat as mountpoint */
+#define NFS_ATTR_FATTR_MOUNTED_ON_FILEID (1U << 22)
#define NFS_ATTR_FATTR (NFS_ATTR_FATTR_TYPE \
| NFS_ATTR_FATTR_MODE \
--
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