[PATCH AUTOSEL 5.16 08/52] NFSv4.1 query for fs_location attr on a new file system

Sasha Levin
2022-02-03T20:30:13Z

From: Olga Kornievskaia <kolga@netapp.com>

[ Upstream commit 1976b2b31462151403c9fc110204fcc2a77bdfd1 ]

Query the server for other possible trunkable locations for a given
file system on a 4.1+ mount.

v2:
-- added missing static to nfs4_discover_trunking,
reported by the kernel test robot

Signed-off-by: Olga Kornievskaia <kolga@netapp.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
fs/nfs/client.c | 7 ++++
fs/nfs/nfs4_fs.h | 9 ++---
fs/nfs/nfs4proc.c | 76 +++++++++++++++++++++++++++++++++++------
fs/nfs/nfs4state.c | 3 +-
include/linux/nfs_xdr.h | 1 +
5 files changed, 81 insertions(+), 15 deletions(-)

diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 1e4dc1ab9312c..f7e39cc4472ba 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -860,6 +860,13 @@ static int nfs_probe_fsinfo(struct nfs_server *server, struct nfs_fh *mntfh, str
server->namelen = pathinfo.max_namelen;
}

+ if (clp->rpc_ops->discover_trunking != NULL &&
+ (server->caps & NFS_CAP_FS_LOCATIONS)) {
+ error = clp->rpc_ops->discover_trunking(server, mntfh);
+ if (error < 0)
+ return error;
+ }
+
return 0;
}

diff --git a/fs/nfs/nfs4_fs.h b/fs/nfs/nfs4_fs.h
index ed5eaca6801ee..2402a3d8ba997 100644
--- a/fs/nfs/nfs4_fs.h
+++ b/fs/nfs/nfs4_fs.h
@@ -260,8 +260,8 @@ struct nfs4_state_maintenance_ops {
};

struct nfs4_mig_recovery_ops {
- int (*get_locations)(struct inode *, struct nfs4_fs_locations *,
- struct page *, const struct cred *);
+ int (*get_locations)(struct nfs_server *, struct nfs_fh *,
+ struct nfs4_fs_locations *, struct page *, const struct cred *);
int (*fsid_present)(struct inode *, const struct cred *);
};

@@ -302,8 +302,9 @@ extern int nfs4_do_close(struct nfs4_state *state, gfp_t gfp_mask, int wait);
extern int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle);
extern int nfs4_proc_fs_locations(struct rpc_clnt *, struct inode *, const struct qstr *,
struct nfs4_fs_locations *, struct page *);
-extern int nfs4_proc_get_locations(struct inode *, struct nfs4_fs_locations *,
- struct page *page, const struct cred *);
+extern int nfs4_proc_get_locations(struct nfs_server *, struct nfs_fh *,
+ struct nfs4_fs_locations *,
+ struct page *page, const struct cred *);
extern int nfs4_proc_fsid_present(struct inode *, const struct cred *);
extern struct rpc_clnt *nfs4_proc_lookup_mountpoint(struct inode *,
struct dentry *,
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index f924d3029d13b..9a94e758212c8 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -3934,6 +3934,60 @@ int nfs4_server_capabilities(struct nfs_server *server, struct nfs_fh *fhandle)
return err;
}

+static int _nfs4_discover_trunking(struct nfs_server *server,
+ struct nfs_fh *fhandle)
+{
+ struct nfs4_fs_locations *locations = NULL;
+ struct page *page;
+ const struct cred *cred;
+ struct nfs_client *clp = server->nfs_client;
+ const struct nfs4_state_maintenance_ops *ops =
+ clp->cl_mvops->state_renewal_ops;
+ int status = -ENOMEM;
+
+ cred = ops->get_state_renewal_cred(clp);
+ if (cred == NULL) {
+ cred = nfs4_get_clid_cred(clp);
+ if (cred == NULL)
+ return -ENOKEY;
+ }
+
+ page = alloc_page(GFP_KERNEL);
+ locations = kmalloc(sizeof(struct nfs4_fs_locations), GFP_KERNEL);
+ if (page == NULL || locations == NULL)
+ goto out;
+
+ status = nfs4_proc_get_locations(server, fhandle, locations, page,
+ cred);
+ if (status)
+ goto out;
+out:
+ if (page)
+ __free_page(page);
+ kfree(locations);
+ return status;
+}
+
+static int nfs4_discover_trunking(struct nfs_server *server,
+ struct nfs_fh *fhandle)
+{
+ struct nfs4_exception exception = {
+ .interruptible = true,
+ };
+ struct nfs_client *clp = server->nfs_client;
+ int err = 0;
+
+ if (!nfs4_has_session(clp))
+ goto out;
+ do {
+ err = nfs4_handle_exception(server,
+ _nfs4_discover_trunking(server, fhandle),
+ &exception);
+ } while (exception.retry);
+out:
+ return err;
+}
+
static int _nfs4_lookup_root(struct nfs_server *server, struct nfs_fh *fhandle,
struct nfs_fsinfo *info)
{
@@ -7820,18 +7874,18 @@ int nfs4_proc_fs_locations(struct rpc_clnt *client, struct inode *dir,
* appended to this compound to identify the client ID which is
* performing recovery.
*/
-static int _nfs40_proc_get_locations(struct inode *inode,
+static int _nfs40_proc_get_locations(struct nfs_server *server,
+ struct nfs_fh *fhandle,
struct nfs4_fs_locations *locations,
struct page *page, const struct cred *cred)
{
- struct nfs_server *server = NFS_SERVER(inode);
struct rpc_clnt *clnt = server->client;
u32 bitmask[2] = {
[0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
};
struct nfs4_fs_locations_arg args = {
.clientid = server->nfs_client->cl_clientid,
- .fh = NFS_FH(inode),
+ .fh = fhandle,
.page = page,
.bitmask = bitmask,
.migration = 1, /* skip LOOKUP */
@@ -7877,17 +7931,17 @@ static int _nfs40_proc_get_locations(struct inode *inode,
* When the client supports GETATTR(fs_locations_info), it can
* be plumbed in here.
*/
-static int _nfs41_proc_get_locations(struct inode *inode,
+static int _nfs41_proc_get_locations(struct nfs_server *server,
+ struct nfs_fh *fhandle,
struct nfs4_fs_locations *locations,
struct page *page, const struct cred *cred)
{
- struct nfs_server *server = NFS_SERVER(inode);
struct rpc_clnt *clnt = server->client;
u32 bitmask[2] = {
[0] = FATTR4_WORD0_FSID | FATTR4_WORD0_FS_LOCATIONS,
};
struct nfs4_fs_locations_arg args = {
- .fh = NFS_FH(inode),
+ .fh = fhandle,
.page = page,
.bitmask = bitmask,
.migration = 1, /* skip LOOKUP */
@@ -7936,11 +7990,11 @@ static int _nfs41_proc_get_locations(struct inode *inode,
* -NFS4ERR_LEASE_MOVED is returned if the server still has leases
* from this client that require migration recovery.
*/
-int nfs4_proc_get_locations(struct inode *inode,
+int nfs4_proc_get_locations(struct nfs_server *server,
+ struct nfs_fh *fhandle,
struct nfs4_fs_locations *locations,
struct page *page, const struct cred *cred)
{
- struct nfs_server *server = NFS_SERVER(inode);
struct nfs_client *clp = server->nfs_client;
const struct nfs4_mig_recovery_ops *ops =
clp->cl_mvops->mig_recovery_ops;
@@ -7953,10 +8007,11 @@ int nfs4_proc_get_locations(struct inode *inode,
(unsigned long long)server->fsid.major,
(unsigned long long)server->fsid.minor,
clp->cl_hostname);
- nfs_display_fhandle(NFS_FH(inode), __func__);
+ nfs_display_fhandle(fhandle, __func__);

do {
- status = ops->get_locations(inode, locations, page, cred);
+ status = ops->get_locations(server, fhandle, locations, page,
+ cred);
if (status != -NFS4ERR_DELAY)
break;
nfs4_handle_exception(server, status, &exception);
@@ -10425,6 +10480,7 @@ const struct nfs_rpc_ops nfs_v4_clientops = {
.free_client = nfs4_free_client,
.create_server = nfs4_create_server,
.clone_server = nfs_clone_server,
+ .discover_trunking = nfs4_discover_trunking,
};

static const struct xattr_handler nfs4_xattr_nfs4_acl_handler = {
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index f3265575c28d2..499bef9fe1186 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -2098,7 +2098,8 @@ static int nfs4_try_migration(struct nfs_server *server, const struct cred *cred
}

inode = d_inode(server->super->s_root);
- result = nfs4_proc_get_locations(inode, locations, page, cred);
+ result = nfs4_proc_get_locations(server, NFS_FH(inode), locations,
+ page, cred);
if (result) {
dprintk("<-- %s: failed to retrieve fs_locations: %d\n",
__func__, result);
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 967a0098f0a97..695fa84611b66 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1795,6 +1795,7 @@ struct nfs_rpc_ops {
struct nfs_server *(*create_server)(struct fs_context *);
struct nfs_server *(*clone_server)(struct nfs_server *, struct nfs_fh *,
struct nfs_fattr *, rpc_authflavor_t);
+ int (*discover_trunking)(struct nfs_server *, struct nfs_fh *);
};

/*
--
2.34.1