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authorBenjamin Coddington <bcodding@redhat.com>2023-06-15 21:07:26 +0300
committerTrond Myklebust <trond.myklebust@hammerspace.com>2023-06-19 22:03:48 +0300
commit1c7251187dc067a6d460cf33ca67da9c1dd87807 (patch)
treec86be60e2f105095aee986f2edf029cd5652a2a7
parente96f9268eea626126021641eefeed02f8669f584 (diff)
downloadlinux-1c7251187dc067a6d460cf33ca67da9c1dd87807.tar.xz
NFS: add superblock sysfs entries
Create a sysfs directory for each mount that corresponds to the mount's nfs_server struct. As the mount is being constructed, use the name "server-n", but rename it to the "MAJOR:MINOR" of the mount after assigning a device_id. The rename approach allows us to populate the mount's directory with links to the various rpc_client objects during the mount's construction. The naming convention (MAJOR:MINOR) can be used to reference a particular NFS mount's sysfs tree. Signed-off-by: Benjamin Coddington <bcodding@redhat.com> Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
-rw-r--r--fs/nfs/client.c16
-rw-r--r--fs/nfs/nfs4client.c3
-rw-r--r--fs/nfs/super.c6
-rw-r--r--fs/nfs/sysfs.c59
-rw-r--r--fs/nfs/sysfs.h5
-rw-r--r--include/linux/nfs_fs_sb.h2
6 files changed, 90 insertions, 1 deletions
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index d5441e60d7e1..e95672a9bcd6 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -698,6 +698,7 @@ static int nfs_init_server(struct nfs_server *server,
return PTR_ERR(clp);
server->nfs_client = clp;
+ nfs_sysfs_add_server(server);
/* Initialise the client representation from the mount data */
server->flags = ctx->flags;
@@ -952,6 +953,8 @@ void nfs_server_remove_lists(struct nfs_server *server)
}
EXPORT_SYMBOL_GPL(nfs_server_remove_lists);
+static DEFINE_IDA(s_sysfs_ids);
+
/*
* Allocate and initialise a server record
*/
@@ -963,6 +966,12 @@ struct nfs_server *nfs_alloc_server(void)
if (!server)
return NULL;
+ server->s_sysfs_id = ida_alloc(&s_sysfs_ids, GFP_KERNEL);
+ if (server->s_sysfs_id < 0) {
+ kfree(server);
+ return NULL;
+ }
+
server->client = server->client_acl = ERR_PTR(-EINVAL);
/* Zero out the NFS state stuff */
@@ -1009,6 +1018,10 @@ void nfs_free_server(struct nfs_server *server)
nfs_put_client(server->nfs_client);
+ nfs_sysfs_remove_server(server);
+ kobject_put(&server->kobj);
+ ida_free(&s_sysfs_ids, server->s_sysfs_id);
+
ida_destroy(&server->lockowner_id);
ida_destroy(&server->openowner_id);
nfs_free_iostats(server->io_stats);
@@ -1110,6 +1123,8 @@ struct nfs_server *nfs_clone_server(struct nfs_server *source,
server->fsid = fattr->fsid;
+ nfs_sysfs_add_server(server);
+
error = nfs_init_server_rpcclient(server,
source->client->cl_timeout,
flavor);
@@ -1393,6 +1408,7 @@ error_0:
void nfs_fs_proc_exit(void)
{
remove_proc_subtree("fs/nfsfs", NULL);
+ ida_destroy(&s_sysfs_ids);
}
#endif /* CONFIG_PROC_FS */
diff --git a/fs/nfs/nfs4client.c b/fs/nfs/nfs4client.c
index 321854942ce1..a098a41811d6 100644
--- a/fs/nfs/nfs4client.c
+++ b/fs/nfs/nfs4client.c
@@ -18,6 +18,7 @@
#include "nfs4idmap.h"
#include "pnfs.h"
#include "netns.h"
+#include "sysfs.h"
#define NFSDBG_FACILITY NFSDBG_CLIENT
@@ -952,6 +953,8 @@ static int nfs4_set_client(struct nfs_server *server,
set_bit(NFS_CS_CHECK_LEASE_TIME, &clp->cl_res_state);
server->nfs_client = clp;
+ nfs_sysfs_add_server(server);
+
return 0;
}
diff --git a/fs/nfs/super.c b/fs/nfs/super.c
index 059b0beabc1b..2284f749d892 100644
--- a/fs/nfs/super.c
+++ b/fs/nfs/super.c
@@ -70,6 +70,8 @@
#include "nfs4session.h"
#include "pnfs.h"
#include "nfs.h"
+#include "netns.h"
+#include "sysfs.h"
#define NFSDBG_FACILITY NFSDBG_VFS
@@ -1089,6 +1091,7 @@ static void nfs_fill_super(struct super_block *sb, struct nfs_fs_context *ctx)
&sb->s_blocksize_bits);
nfs_super_set_maxbytes(sb, server->maxfilesize);
+ nfs_sysfs_move_server_to_sb(sb);
server->has_sec_mnt_opts = ctx->has_sec_mnt_opts;
}
@@ -1331,13 +1334,14 @@ error_splat_super:
}
/*
- * Destroy an NFS2/3 superblock
+ * Destroy an NFS superblock
*/
void nfs_kill_super(struct super_block *s)
{
struct nfs_server *server = NFS_SB(s);
dev_t dev = s->s_dev;
+ nfs_sysfs_move_sb_to_server(server);
generic_shutdown_super(s);
nfs_fscache_release_super_cookie(s);
diff --git a/fs/nfs/sysfs.c b/fs/nfs/sysfs.c
index 90256a3a714e..0ff24f133a02 100644
--- a/fs/nfs/sysfs.c
+++ b/fs/nfs/sysfs.c
@@ -215,3 +215,62 @@ void nfs_netns_sysfs_destroy(struct nfs_net *netns)
netns->nfs_client = NULL;
}
}
+
+static void nfs_sysfs_sb_release(struct kobject *kobj)
+{
+ /* no-op: why? see lib/kobject.c kobject_cleanup() */
+}
+
+static const void *nfs_netns_server_namespace(const struct kobject *kobj)
+{
+ return container_of(kobj, struct nfs_server, kobj)->nfs_client->cl_net;
+}
+
+static struct kobj_type nfs_sb_ktype = {
+ .release = nfs_sysfs_sb_release,
+ .sysfs_ops = &kobj_sysfs_ops,
+ .namespace = nfs_netns_server_namespace,
+ .child_ns_type = nfs_netns_object_child_ns_type,
+};
+
+void nfs_sysfs_add_server(struct nfs_server *server)
+{
+ int ret;
+
+ ret = kobject_init_and_add(&server->kobj, &nfs_sb_ktype,
+ &nfs_kset->kobj, "server-%d", server->s_sysfs_id);
+ if (ret < 0)
+ pr_warn("NFS: nfs sysfs add server-%d failed (%d)\n",
+ server->s_sysfs_id, ret);
+}
+EXPORT_SYMBOL_GPL(nfs_sysfs_add_server);
+
+void nfs_sysfs_move_server_to_sb(struct super_block *s)
+{
+ struct nfs_server *server = s->s_fs_info;
+ int ret;
+
+ ret = kobject_rename(&server->kobj, s->s_id);
+ if (ret < 0)
+ pr_warn("NFS: rename sysfs %s failed (%d)\n",
+ server->kobj.name, ret);
+}
+
+void nfs_sysfs_move_sb_to_server(struct nfs_server *server)
+{
+ const char *s;
+ int ret = -ENOMEM;
+
+ s = kasprintf(GFP_KERNEL, "server-%d", server->s_sysfs_id);
+ if (s)
+ ret = kobject_rename(&server->kobj, s);
+ if (ret < 0)
+ pr_warn("NFS: rename sysfs %s failed (%d)\n",
+ server->kobj.name, ret);
+}
+
+/* unlink, not dec-ref */
+void nfs_sysfs_remove_server(struct nfs_server *server)
+{
+ kobject_del(&server->kobj);
+}
diff --git a/fs/nfs/sysfs.h b/fs/nfs/sysfs.h
index dc4cc9809d1b..c9f5e3677eb5 100644
--- a/fs/nfs/sysfs.h
+++ b/fs/nfs/sysfs.h
@@ -23,4 +23,9 @@ extern void nfs_sysfs_exit(void);
void nfs_netns_sysfs_setup(struct nfs_net *netns, struct net *net);
void nfs_netns_sysfs_destroy(struct nfs_net *netns);
+void nfs_sysfs_add_server(struct nfs_server *s);
+void nfs_sysfs_move_server_to_sb(struct super_block *s);
+void nfs_sysfs_move_sb_to_server(struct nfs_server *s);
+void nfs_sysfs_remove_server(struct nfs_server *s);
+
#endif
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index fa5a592de798..4bed0b6c79c7 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -184,6 +184,7 @@ struct nfs_server {
change_attr_type;/* Description of change attribute */
struct nfs_fsid fsid;
+ int s_sysfs_id; /* sysfs dentry index */
__u64 maxfilesize; /* maximum file size */
struct timespec64 time_delta; /* smallest time granularity */
unsigned long mount_time; /* when this fs was mounted */
@@ -260,6 +261,7 @@ struct nfs_server {
/* User namespace info */
const struct cred *cred;
bool has_sec_mnt_opts;
+ struct kobject kobj;
};
/* Server capabilities */