From e0537c9f828dc9500e5ffc9211099c495b72f402 Mon Sep 17 00:00:00 2001
From: Dai Ngo <dai.ngo@oracle.com>
Date: Tue, 19 Nov 2024 13:43:22 -0800
Subject: [PATCH 01/28] SUNRPC: only put task on cl_tasks list after the RPC
call slot is reserved.
Under heavy write load, we've seen the cl_tasks list grows to
millions of entries. Even though the list is extremely long,
the system still runs fine until the user wants to get the
information of all active RPC tasks by doing:
When this happens, tasks_start acquires the cl_lock to walk the
cl_tasks list, returning one entry at a time to the caller. The
cl_lock is held until all tasks on this list have been processed.
While the cl_lock is held, completed RPC tasks have to spin wait
in rpc_task_release_client for the cl_lock. If there are millions
of entries in the cl_tasks list it will take a long time before
tasks_stop is called and the cl_lock is released.
The spin wait tasks can use up all the available CPUs in the system,
preventing other jobs to run, this causes the system to temporarily
lock up.
This patch fixes this problem by delaying inserting the RPC
task on the cl_tasks list until the RPC call slot is reserved.
This limits the length of the cl_tasks to the number of call
slots available in the system.
Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
include/linux/sunrpc/clnt.h | 1 +
net/sunrpc/clnt.c | 18 +++++++++++++-----
2 files changed, 14 insertions(+), 5 deletions(-)
diff --git a/include/linux/sunrpc/clnt.h b/include/linux/sunrpc/clnt.h
index 5321585c778fc..fec976e581742 100644
--- a/include/linux/sunrpc/clnt.h
+++ b/include/linux/sunrpc/clnt.h
@@ -93,6 +93,7 @@ struct rpc_clnt {
const struct cred *cl_cred;
unsigned int cl_max_connect; /* max number of transports not to the same IP */
struct super_block *pipefs_sb;
+ atomic_t cl_task_count;
};
/*
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 0090162ee8c35..cc5014b58e3b6 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -958,12 +958,17 @@ void rpc_shutdown_client(struct rpc_clnt *clnt)
trace_rpc_clnt_shutdown(clnt);
+ clnt->cl_shutdown = 1;
while (!list_empty(&clnt->cl_tasks)) {
rpc_killall_tasks(clnt);
wait_event_timeout(destroy_wait,
list_empty(&clnt->cl_tasks), 1*HZ);
}
+ /* wait for tasks still in workqueue or waitqueue */
+ wait_event_timeout(destroy_wait,
+ atomic_read(&clnt->cl_task_count) == 0, 1 * HZ);
+
rpc_release_client(clnt);
}
EXPORT_SYMBOL_GPL(rpc_shutdown_client);
@@ -1139,6 +1144,7 @@ void rpc_task_release_client(struct rpc_task *task)
list_del(&task->tk_task);
spin_unlock(&clnt->cl_lock);
task->tk_client = NULL;
+ atomic_dec(&clnt->cl_task_count);
rpc_release_client(clnt);
}
@@ -1189,10 +1195,7 @@ void rpc_task_set_client(struct rpc_task *task, struct rpc_clnt *clnt)
task->tk_flags |= RPC_TASK_TIMEOUT;
if (clnt->cl_noretranstimeo)
task->tk_flags |= RPC_TASK_NO_RETRANS_TIMEOUT;
- /* Add to the client's list of all tasks */
- spin_lock(&clnt->cl_lock);
- list_add_tail(&task->tk_task, &clnt->cl_tasks);
- spin_unlock(&clnt->cl_lock);
+ atomic_inc(&clnt->cl_task_count);
}
static void
@@ -1787,9 +1790,14 @@ call_reserveresult(struct rpc_task *task)
if (status >= 0) {
if (task->tk_rqstp) {
task->tk_action = call_refresh;
+
+ /* Add to the client's list of all tasks */
+ spin_lock(&task->tk_client->cl_lock);
+ if (list_empty(&task->tk_task))
+ list_add_tail(&task->tk_task, &task->tk_client->cl_tasks);
+ spin_unlock(&task->tk_client->cl_lock);
return;
}
-
rpc_call_rpcerror(task, -EIO);
return;
}
From bb504321b96550f9a351920e169de141a3f4c6a1 Mon Sep 17 00:00:00 2001
From: Dai Ngo <dai.ngo@oracle.com>
Date: Tue, 19 Nov 2024 13:43:23 -0800
Subject: [PATCH 02/28] SUNRPC: display total RPC tasks for RPC client
Display the total number of RPC tasks, including tasks waiting
on workqueue and wait queues, for rpc_clnt.
Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
net/sunrpc/clnt.c | 7 +++++--
net/sunrpc/debugfs.c | 3 +++
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index cc5014b58e3b6..79956948ae9d0 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -3327,8 +3327,11 @@ bool rpc_clnt_xprt_switch_has_addr(struct rpc_clnt *clnt,
EXPORT_SYMBOL_GPL(rpc_clnt_xprt_switch_has_addr);
#if IS_ENABLED(CONFIG_SUNRPC_DEBUG)
-static void rpc_show_header(void)
+static void rpc_show_header(struct rpc_clnt *clnt)
{
+ printk(KERN_INFO "clnt[%pISpc] RPC tasks[%d]\n",
+ (struct sockaddr *)&clnt->cl_xprt->addr,
+ atomic_read(&clnt->cl_task_count));
printk(KERN_INFO "-pid- flgs status -client- --rqstp- "
"-timeout ---ops--\n");
}
@@ -3360,7 +3363,7 @@ void rpc_show_tasks(struct net *net)
spin_lock(&clnt->cl_lock);
list_for_each_entry(task, &clnt->cl_tasks, tk_task) {
if (!header) {
- rpc_show_header();
+ rpc_show_header(clnt);
header++;
}
rpc_show_task(clnt, task);
diff --git a/net/sunrpc/debugfs.c b/net/sunrpc/debugfs.c
index a176d5a0b0ee9..e4a4c547c70c1 100644
--- a/net/sunrpc/debugfs.c
+++ b/net/sunrpc/debugfs.c
@@ -74,6 +74,9 @@ tasks_stop(struct seq_file *f, void *v)
{
struct rpc_clnt *clnt = f->private;
spin_unlock(&clnt->cl_lock);
+ seq_printf(f, "clnt[%pISpc] RPC tasks[%d]\n",
+ (struct sockaddr *)&clnt->cl_xprt->addr,
+ atomic_read(&clnt->cl_task_count));
}
static const struct seq_operations tasks_seq_operations = {
From 49fd4e34751e90e6df009b70cd0659dc839e7ca8 Mon Sep 17 00:00:00 2001
From: Zichen Xie <zichenxie0106@gmail.com>
Date: Wed, 18 Dec 2024 00:13:12 +0800
Subject: [PATCH 03/28] NFS: Fix potential buffer overflowin
nfs_sysfs_link_rpc_client()
name is char[64] where the size of clnt->cl_program->name remains
unknown. Invoking strcat() directly will also lead to potential buffer
overflow. Change them to strscpy() and strncat() to fix potential
issues.
Signed-off-by: Zichen Xie <zichenxie0106@gmail.com>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs/sysfs.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/fs/nfs/sysfs.c b/fs/nfs/sysfs.c
index bf378ecd5d9fd..7b59a40d40c06 100644
--- a/fs/nfs/sysfs.c
+++ b/fs/nfs/sysfs.c
@@ -280,9 +280,9 @@ void nfs_sysfs_link_rpc_client(struct nfs_server *server,
char name[RPC_CLIENT_NAME_SIZE];
int ret;
- strcpy(name, clnt->cl_program->name);
- strcat(name, uniq ? uniq : "");
- strcat(name, "_client");
+ strscpy(name, clnt->cl_program->name, sizeof(name));
+ strncat(name, uniq ? uniq : "", sizeof(name) - strlen(name) - 1);
+ strncat(name, "_client", sizeof(name) - strlen(name) - 1);
ret = sysfs_create_link_nowarn(&server->kobj,
&clnt->cl_sysfs->kobject, name);
From 3feec68563dda59517f83d19123aa287a1dfd068 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Fri, 15 Nov 2024 20:40:53 -0500
Subject: [PATCH 04/28] nfs/localio: add direct IO enablement with sync and
async IO support
This commit simply adds the required O_DIRECT plumbing. It doesn't
address the fact that NFS doesn't ensure all writes are page aligned
(nor device logical block size aligned as required by O_DIRECT).
Because NFS will read-modify-write for IO that isn't aligned, LOCALIO
will not use O_DIRECT semantics by default if/when an application
requests the use of O_DIRECT. Allow the use of O_DIRECT semantics by:
1: Adding a flag to the nfs_pgio_header struct to allow the NFS
O_DIRECT layer to signal that O_DIRECT was used by the application
2: Adding a 'localio_O_DIRECT_semantics' NFS module parameter that
when enabled will cause LOCALIO to use O_DIRECT semantics (this may
cause IO to fail if applications do not properly align their IO).
This commit is derived from code developed by Weston Andros Adamson.
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
Documentation/filesystems/nfs/localio.rst | 13 ++++
fs/nfs/direct.c | 1 +
fs/nfs/localio.c | 93 ++++++++++++++++++++---
include/linux/nfs_xdr.h | 1 +
4 files changed, 98 insertions(+), 10 deletions(-)
diff --git a/Documentation/filesystems/nfs/localio.rst b/Documentation/filesystems/nfs/localio.rst
index bd1967e2eab32..20fc901a08f4d 100644
--- a/Documentation/filesystems/nfs/localio.rst
+++ b/Documentation/filesystems/nfs/localio.rst
@@ -306,6 +306,19 @@ is issuing IO to the underlying local filesystem that it is sharing with
the NFS server. See: fs/nfs/localio.c:nfs_local_doio() and
fs/nfs/localio.c:nfs_local_commit().
+With normal NFS that makes use of RPC to issue IO to the server, if an
+application uses O_DIRECT the NFS client will bypass the pagecache but
+the NFS server will not. Because the NFS server's use of buffered IO
+affords applications to be less precise with their alignment when
+issuing IO to the NFS client. LOCALIO can be configured to use O_DIRECT
+semantics by setting the 'localio_O_DIRECT_semantics' nfs module
+parameter to Y, e.g.:
+
+ echo Y > /sys/module/nfs/parameters/localio_O_DIRECT_semantics
+
+Once enabled, it will cause LOCALIO to use O_DIRECT semantics (this may
+cause IO to fail if applications do not properly align their IO).
+
Security
========
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index b08dbe96bc579..f45beea92d034 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -303,6 +303,7 @@ static void nfs_read_sync_pgio_error(struct list_head *head, int error)
static void nfs_direct_pgio_init(struct nfs_pgio_header *hdr)
{
get_dreq(hdr->dreq);
+ set_bit(NFS_IOHDR_ODIRECT, &hdr->flags);
}
static const struct nfs_pgio_completion_ops nfs_direct_read_completion_ops = {
diff --git a/fs/nfs/localio.c b/fs/nfs/localio.c
index 4b8618cf114ca..7637786c5cb70 100644
--- a/fs/nfs/localio.c
+++ b/fs/nfs/localio.c
@@ -35,6 +35,7 @@ struct nfs_local_kiocb {
struct bio_vec *bvec;
struct nfs_pgio_header *hdr;
struct work_struct work;
+ void (*aio_complete_work)(struct work_struct *);
struct nfsd_file *localio;
};
@@ -48,6 +49,11 @@ struct nfs_local_fsync_ctx {
static bool localio_enabled __read_mostly = true;
module_param(localio_enabled, bool, 0644);
+static bool localio_O_DIRECT_semantics __read_mostly = false;
+module_param(localio_O_DIRECT_semantics, bool, 0644);
+MODULE_PARM_DESC(localio_O_DIRECT_semantics,
+ "LOCALIO will use O_DIRECT semantics to filesystem.");
+
static inline bool nfs_client_is_local(const struct nfs_client *clp)
{
return !!test_bit(NFS_CS_LOCAL_IO, &clp->cl_flags);
@@ -285,10 +291,19 @@ nfs_local_iocb_alloc(struct nfs_pgio_header *hdr,
kfree(iocb);
return NULL;
}
- init_sync_kiocb(&iocb->kiocb, file);
+
+ if (localio_O_DIRECT_semantics &&
+ test_bit(NFS_IOHDR_ODIRECT, &hdr->flags)) {
+ iocb->kiocb.ki_filp = file;
+ iocb->kiocb.ki_flags = IOCB_DIRECT;
+ } else
+ init_sync_kiocb(&iocb->kiocb, file);
+
iocb->kiocb.ki_pos = hdr->args.offset;
iocb->hdr = hdr;
iocb->kiocb.ki_flags &= ~IOCB_APPEND;
+ iocb->aio_complete_work = NULL;
+
return iocb;
}
@@ -343,6 +358,18 @@ nfs_local_pgio_release(struct nfs_local_kiocb *iocb)
nfs_local_hdr_release(hdr, hdr->task.tk_ops);
}
+/*
+ * Complete the I/O from iocb->kiocb.ki_complete()
+ *
+ * Note that this function can be called from a bottom half context,
+ * hence we need to queue the rpc_call_done() etc to a workqueue
+ */
+static inline void nfs_local_pgio_aio_complete(struct nfs_local_kiocb *iocb)
+{
+ INIT_WORK(&iocb->work, iocb->aio_complete_work);
+ queue_work(nfsiod_workqueue, &iocb->work);
+}
+
static void
nfs_local_read_done(struct nfs_local_kiocb *iocb, long status)
{
@@ -365,6 +392,23 @@ nfs_local_read_done(struct nfs_local_kiocb *iocb, long status)
status > 0 ? status : 0, hdr->res.eof);
}
+static void nfs_local_read_aio_complete_work(struct work_struct *work)
+{
+ struct nfs_local_kiocb *iocb =
+ container_of(work, struct nfs_local_kiocb, work);
+
+ nfs_local_pgio_release(iocb);
+}
+
+static void nfs_local_read_aio_complete(struct kiocb *kiocb, long ret)
+{
+ struct nfs_local_kiocb *iocb =
+ container_of(kiocb, struct nfs_local_kiocb, kiocb);
+
+ nfs_local_read_done(iocb, ret);
+ nfs_local_pgio_aio_complete(iocb); /* Calls nfs_local_read_aio_complete_work */
+}
+
static void nfs_local_call_read(struct work_struct *work)
{
struct nfs_local_kiocb *iocb =
@@ -379,10 +423,10 @@ static void nfs_local_call_read(struct work_struct *work)
nfs_local_iter_init(&iter, iocb, READ);
status = filp->f_op->read_iter(&iocb->kiocb, &iter);
- WARN_ON_ONCE(status == -EIOCBQUEUED);
-
- nfs_local_read_done(iocb, status);
- nfs_local_pgio_release(iocb);
+ if (status != -EIOCBQUEUED) {
+ nfs_local_read_done(iocb, status);
+ nfs_local_pgio_release(iocb);
+ }
revert_creds(save_cred);
}
@@ -410,6 +454,11 @@ nfs_do_local_read(struct nfs_pgio_header *hdr,
nfs_local_pgio_init(hdr, call_ops);
hdr->res.eof = false;
+ if (iocb->kiocb.ki_flags & IOCB_DIRECT) {
+ iocb->kiocb.ki_complete = nfs_local_read_aio_complete;
+ iocb->aio_complete_work = nfs_local_read_aio_complete_work;
+ }
+
INIT_WORK(&iocb->work, nfs_local_call_read);
queue_work(nfslocaliod_workqueue, &iocb->work);
@@ -534,6 +583,24 @@ nfs_local_write_done(struct nfs_local_kiocb *iocb, long status)
nfs_local_pgio_done(hdr, status);
}
+static void nfs_local_write_aio_complete_work(struct work_struct *work)
+{
+ struct nfs_local_kiocb *iocb =
+ container_of(work, struct nfs_local_kiocb, work);
+
+ nfs_local_vfs_getattr(iocb);
+ nfs_local_pgio_release(iocb);
+}
+
+static void nfs_local_write_aio_complete(struct kiocb *kiocb, long ret)
+{
+ struct nfs_local_kiocb *iocb =
+ container_of(kiocb, struct nfs_local_kiocb, kiocb);
+
+ nfs_local_write_done(iocb, ret);
+ nfs_local_pgio_aio_complete(iocb); /* Calls nfs_local_write_aio_complete_work */
+}
+
static void nfs_local_call_write(struct work_struct *work)
{
struct nfs_local_kiocb *iocb =
@@ -552,11 +619,11 @@ static void nfs_local_call_write(struct work_struct *work)
file_start_write(filp);
status = filp->f_op->write_iter(&iocb->kiocb, &iter);
file_end_write(filp);
- WARN_ON_ONCE(status == -EIOCBQUEUED);
-
- nfs_local_write_done(iocb, status);
- nfs_local_vfs_getattr(iocb);
- nfs_local_pgio_release(iocb);
+ if (status != -EIOCBQUEUED) {
+ nfs_local_write_done(iocb, status);
+ nfs_local_vfs_getattr(iocb);
+ nfs_local_pgio_release(iocb);
+ }
revert_creds(save_cred);
current->flags = old_flags;
@@ -592,10 +659,16 @@ nfs_do_local_write(struct nfs_pgio_header *hdr,
case NFS_FILE_SYNC:
iocb->kiocb.ki_flags |= IOCB_DSYNC|IOCB_SYNC;
}
+
nfs_local_pgio_init(hdr, call_ops);
nfs_set_local_verifier(hdr->inode, hdr->res.verf, hdr->args.stable);
+ if (iocb->kiocb.ki_flags & IOCB_DIRECT) {
+ iocb->kiocb.ki_complete = nfs_local_write_aio_complete;
+ iocb->aio_complete_work = nfs_local_write_aio_complete_work;
+ }
+
INIT_WORK(&iocb->work, nfs_local_call_write);
queue_work(nfslocaliod_workqueue, &iocb->work);
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 559273a0f16d8..80766ff0a47cf 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -1637,6 +1637,7 @@ enum {
NFS_IOHDR_RESEND_PNFS,
NFS_IOHDR_RESEND_MDS,
NFS_IOHDR_UNSTABLE_WRITES,
+ NFS_IOHDR_ODIRECT,
};
struct nfs_io_completion;
From a61466315d7afca032342183a57e62d5e3a3157c Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Fri, 15 Nov 2024 20:40:54 -0500
Subject: [PATCH 05/28] nfsd: add nfsd_file_{get,put} to 'nfs_to'
nfsd_localio_operations
In later a commit LOCALIO must call both nfsd_file_get and
nfsd_file_put to manage extra nfsd_file references.
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfsd/localio.c | 2 ++
include/linux/nfslocalio.h | 2 ++
2 files changed, 4 insertions(+)
diff --git a/fs/nfsd/localio.c b/fs/nfsd/localio.c
index f441cb9f74d56..8beda4c851119 100644
--- a/fs/nfsd/localio.c
+++ b/fs/nfsd/localio.c
@@ -29,6 +29,8 @@ static const struct nfsd_localio_operations nfsd_localio_ops = {
.nfsd_serv_put = nfsd_serv_put,
.nfsd_open_local_fh = nfsd_open_local_fh,
.nfsd_file_put_local = nfsd_file_put_local,
+ .nfsd_file_get = nfsd_file_get,
+ .nfsd_file_put = nfsd_file_put,
.nfsd_file_file = nfsd_file_file,
};
diff --git a/include/linux/nfslocalio.h b/include/linux/nfslocalio.h
index 9202f4b24343d..ab6a2a53f505f 100644
--- a/include/linux/nfslocalio.h
+++ b/include/linux/nfslocalio.h
@@ -56,6 +56,8 @@ struct nfsd_localio_operations {
const struct nfs_fh *,
const fmode_t);
struct net *(*nfsd_file_put_local)(struct nfsd_file *);
+ struct nfsd_file *(*nfsd_file_get)(struct nfsd_file *);
+ void (*nfsd_file_put)(struct nfsd_file *);
struct file *(*nfsd_file_file)(struct nfsd_file *);
} ____cacheline_aligned;
From b49f049a22227df701bfbca083d6cc859496e615 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Fri, 15 Nov 2024 20:40:55 -0500
Subject: [PATCH 06/28] nfs_common: rename functions that invalidate LOCALIO
nfs_clients
Rename nfs_uuid_invalidate_one_client to nfs_localio_disable_client.
Rename nfs_uuid_invalidate_clients to nfs_localio_invalidate_clients.
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: NeilBrown <neilb@suse.de>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs/localio.c | 2 +-
fs/nfs_common/nfslocalio.c | 8 ++++----
fs/nfsd/nfsctl.c | 4 ++--
include/linux/nfslocalio.h | 5 +++--
4 files changed, 10 insertions(+), 9 deletions(-)
diff --git a/fs/nfs/localio.c b/fs/nfs/localio.c
index 7637786c5cb70..94af5d89bb996 100644
--- a/fs/nfs/localio.c
+++ b/fs/nfs/localio.c
@@ -140,7 +140,7 @@ void nfs_local_disable(struct nfs_client *clp)
spin_lock(&clp->cl_localio_lock);
if (test_and_clear_bit(NFS_CS_LOCAL_IO, &clp->cl_flags)) {
trace_nfs_local_disable(clp);
- nfs_uuid_invalidate_one_client(&clp->cl_uuid);
+ nfs_localio_disable_client(&clp->cl_uuid);
}
spin_unlock(&clp->cl_localio_lock);
}
diff --git a/fs/nfs_common/nfslocalio.c b/fs/nfs_common/nfslocalio.c
index a74ec08f6c96d..904439e4bb859 100644
--- a/fs/nfs_common/nfslocalio.c
+++ b/fs/nfs_common/nfslocalio.c
@@ -107,7 +107,7 @@ static void nfs_uuid_put_locked(nfs_uuid_t *nfs_uuid)
list_del_init(&nfs_uuid->list);
}
-void nfs_uuid_invalidate_clients(struct list_head *list)
+void nfs_localio_invalidate_clients(struct list_head *list)
{
nfs_uuid_t *nfs_uuid, *tmp;
@@ -116,9 +116,9 @@ void nfs_uuid_invalidate_clients(struct list_head *list)
nfs_uuid_put_locked(nfs_uuid);
spin_unlock(&nfs_uuid_lock);
}
-EXPORT_SYMBOL_GPL(nfs_uuid_invalidate_clients);
+EXPORT_SYMBOL_GPL(nfs_localio_invalidate_clients);
-void nfs_uuid_invalidate_one_client(nfs_uuid_t *nfs_uuid)
+void nfs_localio_disable_client(nfs_uuid_t *nfs_uuid)
{
if (nfs_uuid->net) {
spin_lock(&nfs_uuid_lock);
@@ -126,7 +126,7 @@ void nfs_uuid_invalidate_one_client(nfs_uuid_t *nfs_uuid)
spin_unlock(&nfs_uuid_lock);
}
}
-EXPORT_SYMBOL_GPL(nfs_uuid_invalidate_one_client);
+EXPORT_SYMBOL_GPL(nfs_localio_disable_client);
struct nfsd_file *nfs_open_local_fh(nfs_uuid_t *uuid,
struct rpc_clnt *rpc_clnt, const struct cred *cred,
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 3adbc05ebaac4..727904d8a4d01 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -2276,14 +2276,14 @@ static __net_init int nfsd_net_init(struct net *net)
* nfsd_net_pre_exit - Disconnect localio clients from net namespace
* @net: a network namespace that is about to be destroyed
*
- * This invalidated ->net pointers held by localio clients
+ * This invalidates ->net pointers held by localio clients
* while they can still safely access nn->counter.
*/
static __net_exit void nfsd_net_pre_exit(struct net *net)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- nfs_uuid_invalidate_clients(&nn->local_clients);
+ nfs_localio_invalidate_clients(&nn->local_clients);
}
#endif
diff --git a/include/linux/nfslocalio.h b/include/linux/nfslocalio.h
index ab6a2a53f505f..a05d1043f2b07 100644
--- a/include/linux/nfslocalio.h
+++ b/include/linux/nfslocalio.h
@@ -37,8 +37,9 @@ bool nfs_uuid_begin(nfs_uuid_t *);
void nfs_uuid_end(nfs_uuid_t *);
void nfs_uuid_is_local(const uuid_t *, struct list_head *,
struct net *, struct auth_domain *, struct module *);
-void nfs_uuid_invalidate_clients(struct list_head *list);
-void nfs_uuid_invalidate_one_client(nfs_uuid_t *nfs_uuid);
+
+void nfs_localio_disable_client(nfs_uuid_t *nfs_uuid);
+void nfs_localio_invalidate_clients(struct list_head *list);
/* localio needs to map filehandle -> struct nfsd_file */
extern struct nfsd_file *
From 4ee7ba40007357a48447a8cbc667480acf9a006a Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Fri, 15 Nov 2024 20:40:56 -0500
Subject: [PATCH 07/28] nfs_common: move localio_lock to new lock member of
nfs_uuid_t
Remove cl_localio_lock from 'struct nfs_client' in favor of adding a
lock to the nfs_uuid_t struct (which is embedded in each nfs_client).
Push nfs_local_{enable,disable} implementation down to nfs_common.
Those methods now call nfs_localio_{enable,disable}_client.
This allows implementing nfs_localio_invalidate_clients in terms of
nfs_localio_disable_client.
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs/client.c | 1 -
fs/nfs/localio.c | 14 +++-------
fs/nfs_common/nfslocalio.c | 55 +++++++++++++++++++++++++++-----------
include/linux/nfs_fs_sb.h | 1 -
include/linux/nfslocalio.h | 8 +++++-
5 files changed, 50 insertions(+), 29 deletions(-)
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 550ca934c9cfc..e83e1ce046130 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -186,7 +186,6 @@ struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
seqlock_init(&clp->cl_boot_lock);
ktime_get_real_ts64(&clp->cl_nfssvc_boot);
nfs_uuid_init(&clp->cl_uuid);
- spin_lock_init(&clp->cl_localio_lock);
#endif /* CONFIG_NFS_LOCALIO */
clp->cl_principal = "*";
diff --git a/fs/nfs/localio.c b/fs/nfs/localio.c
index 94af5d89bb996..7191135b47a42 100644
--- a/fs/nfs/localio.c
+++ b/fs/nfs/localio.c
@@ -126,10 +126,8 @@ const struct rpc_program nfslocalio_program = {
*/
static void nfs_local_enable(struct nfs_client *clp)
{
- spin_lock(&clp->cl_localio_lock);
- set_bit(NFS_CS_LOCAL_IO, &clp->cl_flags);
trace_nfs_local_enable(clp);
- spin_unlock(&clp->cl_localio_lock);
+ nfs_localio_enable_client(clp);
}
/*
@@ -137,12 +135,8 @@ static void nfs_local_enable(struct nfs_client *clp)
*/
void nfs_local_disable(struct nfs_client *clp)
{
- spin_lock(&clp->cl_localio_lock);
- if (test_and_clear_bit(NFS_CS_LOCAL_IO, &clp->cl_flags)) {
- trace_nfs_local_disable(clp);
- nfs_localio_disable_client(&clp->cl_uuid);
- }
- spin_unlock(&clp->cl_localio_lock);
+ trace_nfs_local_disable(clp);
+ nfs_localio_disable_client(clp);
}
/*
@@ -184,7 +178,7 @@ static bool nfs_server_uuid_is_local(struct nfs_client *clp)
rpc_shutdown_client(rpcclient_localio);
/* Server is only local if it initialized required struct members */
- if (status || !clp->cl_uuid.net || !clp->cl_uuid.dom)
+ if (status || !rcu_access_pointer(clp->cl_uuid.net) || !clp->cl_uuid.dom)
return false;
return true;
diff --git a/fs/nfs_common/nfslocalio.c b/fs/nfs_common/nfslocalio.c
index 904439e4bb859..abc132166742e 100644
--- a/fs/nfs_common/nfslocalio.c
+++ b/fs/nfs_common/nfslocalio.c
@@ -7,6 +7,9 @@
#include <linux/module.h>
#include <linux/list.h>
#include <linux/nfslocalio.h>
+#include <linux/nfs3.h>
+#include <linux/nfs4.h>
+#include <linux/nfs_fs_sb.h>
#include <net/netns/generic.h>
MODULE_LICENSE("GPL");
@@ -25,6 +28,7 @@ void nfs_uuid_init(nfs_uuid_t *nfs_uuid)
nfs_uuid->net = NULL;
nfs_uuid->dom = NULL;
INIT_LIST_HEAD(&nfs_uuid->list);
+ spin_lock_init(&nfs_uuid->lock);
}
EXPORT_SYMBOL_GPL(nfs_uuid_init);
@@ -94,12 +98,23 @@ void nfs_uuid_is_local(const uuid_t *uuid, struct list_head *list,
}
EXPORT_SYMBOL_GPL(nfs_uuid_is_local);
+void nfs_localio_enable_client(struct nfs_client *clp)
+{
+ nfs_uuid_t *nfs_uuid = &clp->cl_uuid;
+
+ spin_lock(&nfs_uuid->lock);
+ set_bit(NFS_CS_LOCAL_IO, &clp->cl_flags);
+ spin_unlock(&nfs_uuid->lock);
+}
+EXPORT_SYMBOL_GPL(nfs_localio_enable_client);
+
static void nfs_uuid_put_locked(nfs_uuid_t *nfs_uuid)
{
- if (nfs_uuid->net) {
- module_put(nfsd_mod);
- nfs_uuid->net = NULL;
- }
+ if (!nfs_uuid->net)
+ return;
+ module_put(nfsd_mod);
+ RCU_INIT_POINTER(nfs_uuid->net, NULL);
+
if (nfs_uuid->dom) {
auth_domain_put(nfs_uuid->dom);
nfs_uuid->dom = NULL;
@@ -107,27 +122,35 @@ static void nfs_uuid_put_locked(nfs_uuid_t *nfs_uuid)
list_del_init(&nfs_uuid->list);
}
-void nfs_localio_invalidate_clients(struct list_head *list)
+void nfs_localio_disable_client(struct nfs_client *clp)
{
- nfs_uuid_t *nfs_uuid, *tmp;
-
- spin_lock(&nfs_uuid_lock);
- list_for_each_entry_safe(nfs_uuid, tmp, list, list)
- nfs_uuid_put_locked(nfs_uuid);
- spin_unlock(&nfs_uuid_lock);
-}
-EXPORT_SYMBOL_GPL(nfs_localio_invalidate_clients);
+ nfs_uuid_t *nfs_uuid = &clp->cl_uuid;
-void nfs_localio_disable_client(nfs_uuid_t *nfs_uuid)
-{
- if (nfs_uuid->net) {
+ spin_lock(&nfs_uuid->lock);
+ if (test_and_clear_bit(NFS_CS_LOCAL_IO, &clp->cl_flags)) {
spin_lock(&nfs_uuid_lock);
nfs_uuid_put_locked(nfs_uuid);
spin_unlock(&nfs_uuid_lock);
}
+ spin_unlock(&nfs_uuid->lock);
}
EXPORT_SYMBOL_GPL(nfs_localio_disable_client);
+void nfs_localio_invalidate_clients(struct list_head *cl_uuid_list)
+{
+ nfs_uuid_t *nfs_uuid, *tmp;
+
+ spin_lock(&nfs_uuid_lock);
+ list_for_each_entry_safe(nfs_uuid, tmp, cl_uuid_list, list) {
+ struct nfs_client *clp =
+ container_of(nfs_uuid, struct nfs_client, cl_uuid);
+
+ nfs_localio_disable_client(clp);
+ }
+ spin_unlock(&nfs_uuid_lock);
+}
+EXPORT_SYMBOL_GPL(nfs_localio_invalidate_clients);
+
struct nfsd_file *nfs_open_local_fh(nfs_uuid_t *uuid,
struct rpc_clnt *rpc_clnt, const struct cred *cred,
const struct nfs_fh *nfs_fh, const fmode_t fmode)
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index b804346a97419..239d86ef166c0 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -132,7 +132,6 @@ struct nfs_client {
struct timespec64 cl_nfssvc_boot;
seqlock_t cl_boot_lock;
nfs_uuid_t cl_uuid;
- spinlock_t cl_localio_lock;
#endif /* CONFIG_NFS_LOCALIO */
};
diff --git a/include/linux/nfslocalio.h b/include/linux/nfslocalio.h
index a05d1043f2b07..4d5583873f418 100644
--- a/include/linux/nfslocalio.h
+++ b/include/linux/nfslocalio.h
@@ -6,6 +6,7 @@
#ifndef __LINUX_NFSLOCALIO_H
#define __LINUX_NFSLOCALIO_H
+
/* nfsd_file structure is purposely kept opaque to NFS client */
struct nfsd_file;
@@ -19,6 +20,8 @@ struct nfsd_file;
#include <linux/nfs.h>
#include <net/net_namespace.h>
+struct nfs_client;
+
/*
* Useful to allow a client to negotiate if localio
* possible with its server.
@@ -27,6 +30,8 @@ struct nfsd_file;
*/
typedef struct {
uuid_t uuid;
+ /* sadly this struct is just over a cacheline, avoid bouncing */
+ spinlock_t ____cacheline_aligned lock;
struct list_head list;
struct net __rcu *net; /* nfsd's network namespace */
struct auth_domain *dom; /* auth_domain for localio */
@@ -38,7 +43,8 @@ void nfs_uuid_end(nfs_uuid_t *);
void nfs_uuid_is_local(const uuid_t *, struct list_head *,
struct net *, struct auth_domain *, struct module *);
-void nfs_localio_disable_client(nfs_uuid_t *nfs_uuid);
+void nfs_localio_enable_client(struct nfs_client *clp);
+void nfs_localio_disable_client(struct nfs_client *clp);
void nfs_localio_invalidate_clients(struct list_head *list);
/* localio needs to map filehandle -> struct nfsd_file */
From 86e00412254a717ffd5d38dc5ec0ee1cce6281b3 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Fri, 15 Nov 2024 20:40:57 -0500
Subject: [PATCH 08/28] nfs: cache all open LOCALIO nfsd_file(s) in client
This commit switches from leaning heavily on NFSD's filecache (in
terms of GC'd nfsd_files) back to caching nfsd_files in the
client. A later commit will add the callback mechanism needed to
allow NFSD to force the NFS client to cleanup all cached nfsd_files.
Add nfs_fh_localio_init() and 'struct nfs_fh_localio' to cache opened
nfsd_file(s) (both a RO and RW nfsd_file is able to be opened and
cached for a given nfs_fh).
Update nfs_local_open_fh() to cache the nfsd_file once it is opened
using __nfs_local_open_fh().
Introduce nfs_close_local_fh() to clear the cached open nfsd_files and
call nfs_to_nfsd_file_put_local().
Refcounting is such that:
- nfs_local_open_fh() is paired with nfs_close_local_fh().
- __nfs_local_open_fh() is paired with nfs_to_nfsd_file_put_local().
- nfs_local_file_get() is paired with nfs_local_file_put().
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs/flexfilelayout/flexfilelayout.c | 25 ++++----
fs/nfs/flexfilelayout/flexfilelayout.h | 1 +
fs/nfs/inode.c | 3 +
fs/nfs/internal.h | 4 +-
fs/nfs/localio.c | 89 +++++++++++++++++++++-----
fs/nfs/pagelist.c | 5 +-
fs/nfs/write.c | 3 +-
fs/nfs_common/nfslocalio.c | 52 ++++++++++++++-
include/linux/nfs_fs.h | 22 ++++++-
include/linux/nfslocalio.h | 16 +++--
10 files changed, 176 insertions(+), 44 deletions(-)
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index f78115c6c2c12..ce61bf1ada6c3 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -164,18 +164,17 @@ decode_name(struct xdr_stream *xdr, u32 *id)
}
static struct nfsd_file *
-ff_local_open_fh(struct nfs_client *clp, const struct cred *cred,
+ff_local_open_fh(struct pnfs_layout_segment *lseg, u32 ds_idx,
+ struct nfs_client *clp, const struct cred *cred,
struct nfs_fh *fh, fmode_t mode)
{
- if (mode & FMODE_WRITE) {
- /*
- * Always request read and write access since this corresponds
- * to a rw layout.
- */
- mode |= FMODE_READ;
- }
+#if IS_ENABLED(CONFIG_NFS_LOCALIO)
+ struct nfs4_ff_layout_mirror *mirror = FF_LAYOUT_COMP(lseg, ds_idx);
- return nfs_local_open_fh(clp, cred, fh, mode);
+ return nfs_local_open_fh(clp, cred, fh, &mirror->nfl, mode);
+#else
+ return NULL;
+#endif
}
static bool ff_mirror_match_fh(const struct nfs4_ff_layout_mirror *m1,
@@ -247,6 +246,7 @@ static struct nfs4_ff_layout_mirror *ff_layout_alloc_mirror(gfp_t gfp_flags)
spin_lock_init(&mirror->lock);
refcount_set(&mirror->ref, 1);
INIT_LIST_HEAD(&mirror->mirrors);
+ nfs_localio_file_init(&mirror->nfl);
}
return mirror;
}
@@ -257,6 +257,7 @@ static void ff_layout_free_mirror(struct nfs4_ff_layout_mirror *mirror)
ff_layout_remove_mirror(mirror);
kfree(mirror->fh_versions);
+ nfs_close_local_fh(&mirror->nfl);
cred = rcu_access_pointer(mirror->ro_cred);
put_cred(cred);
cred = rcu_access_pointer(mirror->rw_cred);
@@ -1820,7 +1821,7 @@ ff_layout_read_pagelist(struct nfs_pgio_header *hdr)
hdr->mds_offset = offset;
/* Start IO accounting for local read */
- localio = ff_local_open_fh(ds->ds_clp, ds_cred, fh, FMODE_READ);
+ localio = ff_local_open_fh(lseg, idx, ds->ds_clp, ds_cred, fh, FMODE_READ);
if (localio) {
hdr->task.tk_start = ktime_get();
ff_layout_read_record_layoutstats_start(&hdr->task, hdr);
@@ -1896,7 +1897,7 @@ ff_layout_write_pagelist(struct nfs_pgio_header *hdr, int sync)
hdr->args.offset = offset;
/* Start IO accounting for local write */
- localio = ff_local_open_fh(ds->ds_clp, ds_cred, fh,
+ localio = ff_local_open_fh(lseg, idx, ds->ds_clp, ds_cred, fh,
FMODE_READ|FMODE_WRITE);
if (localio) {
hdr->task.tk_start = ktime_get();
@@ -1981,7 +1982,7 @@ static int ff_layout_initiate_commit(struct nfs_commit_data *data, int how)
data->args.fh = fh;
/* Start IO accounting for local commit */
- localio = ff_local_open_fh(ds->ds_clp, ds_cred, fh,
+ localio = ff_local_open_fh(lseg, idx, ds->ds_clp, ds_cred, fh,
FMODE_READ|FMODE_WRITE);
if (localio) {
data->task.tk_start = ktime_get();
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.h b/fs/nfs/flexfilelayout/flexfilelayout.h
index f84b3fb0dddd8..095df09017a57 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.h
+++ b/fs/nfs/flexfilelayout/flexfilelayout.h
@@ -83,6 +83,7 @@ struct nfs4_ff_layout_mirror {
nfs4_stateid stateid;
const struct cred __rcu *ro_cred;
const struct cred __rcu *rw_cred;
+ struct nfs_file_localio nfl;
refcount_t ref;
spinlock_t lock;
unsigned long flags;
diff --git a/fs/nfs/inode.c b/fs/nfs/inode.c
index 596f351701372..1aa67fca69b2f 100644
--- a/fs/nfs/inode.c
+++ b/fs/nfs/inode.c
@@ -1137,6 +1137,8 @@ struct nfs_open_context *alloc_nfs_open_context(struct dentry *dentry,
ctx->lock_context.open_context = ctx;
INIT_LIST_HEAD(&ctx->list);
ctx->mdsthreshold = NULL;
+ nfs_localio_file_init(&ctx->nfl);
+
return ctx;
}
EXPORT_SYMBOL_GPL(alloc_nfs_open_context);
@@ -1168,6 +1170,7 @@ static void __put_nfs_open_context(struct nfs_open_context *ctx, int is_sync)
nfs_sb_deactive(sb);
put_rpccred(rcu_dereference_protected(ctx->ll_cred, 1));
kfree(ctx->mdsthreshold);
+ nfs_close_local_fh(&ctx->nfl);
kfree_rcu(ctx, rcu_head);
}
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index e564bd11ba607..febf289a9e4c4 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -460,6 +460,7 @@ extern void nfs_local_probe(struct nfs_client *);
extern struct nfsd_file *nfs_local_open_fh(struct nfs_client *,
const struct cred *,
struct nfs_fh *,
+ struct nfs_file_localio *,
const fmode_t);
extern int nfs_local_doio(struct nfs_client *,
struct nfsd_file *,
@@ -475,7 +476,8 @@ static inline void nfs_local_disable(struct nfs_client *clp) {}
static inline void nfs_local_probe(struct nfs_client *clp) {}
static inline struct nfsd_file *
nfs_local_open_fh(struct nfs_client *clp, const struct cred *cred,
- struct nfs_fh *fh, const fmode_t mode)
+ struct nfs_fh *fh, struct nfs_file_localio *nfl,
+ const fmode_t mode)
{
return NULL;
}
diff --git a/fs/nfs/localio.c b/fs/nfs/localio.c
index 7191135b47a42..7e432057c3a1f 100644
--- a/fs/nfs/localio.c
+++ b/fs/nfs/localio.c
@@ -211,27 +211,33 @@ void nfs_local_probe(struct nfs_client *clp)
}
EXPORT_SYMBOL_GPL(nfs_local_probe);
+static inline struct nfsd_file *nfs_local_file_get(struct nfsd_file *nf)
+{
+ return nfs_to->nfsd_file_get(nf);
+}
+
+static inline void nfs_local_file_put(struct nfsd_file *nf)
+{
+ nfs_to->nfsd_file_put(nf);
+}
+
/*
- * nfs_local_open_fh - open a local filehandle in terms of nfsd_file
+ * __nfs_local_open_fh - open a local filehandle in terms of nfsd_file.
*
- * Returns a pointer to a struct nfsd_file or NULL
+ * Returns a pointer to a struct nfsd_file or ERR_PTR.
+ * Caller must release returned nfsd_file with nfs_to_nfsd_file_put_local().
*/
-struct nfsd_file *
-nfs_local_open_fh(struct nfs_client *clp, const struct cred *cred,
- struct nfs_fh *fh, const fmode_t mode)
+static struct nfsd_file *
+__nfs_local_open_fh(struct nfs_client *clp, const struct cred *cred,
+ struct nfs_fh *fh, struct nfs_file_localio *nfl,
+ const fmode_t mode)
{
struct nfsd_file *localio;
- int status;
-
- if (!nfs_server_is_local(clp))
- return NULL;
- if (mode & ~(FMODE_READ | FMODE_WRITE))
- return NULL;
localio = nfs_open_local_fh(&clp->cl_uuid, clp->cl_rpcclient,
- cred, fh, mode);
+ cred, fh, nfl, mode);
if (IS_ERR(localio)) {
- status = PTR_ERR(localio);
+ int status = PTR_ERR(localio);
trace_nfs_local_open_fh(fh, mode, status);
switch (status) {
case -ENOMEM:
@@ -240,10 +246,59 @@ nfs_local_open_fh(struct nfs_client *clp, const struct cred *cred,
/* Revalidate localio, will disable if unsupported */
nfs_local_probe(clp);
}
- return NULL;
}
return localio;
}
+
+/*
+ * nfs_local_open_fh - open a local filehandle in terms of nfsd_file.
+ * First checking if the open nfsd_file is already cached, otherwise
+ * must __nfs_local_open_fh and insert the nfsd_file in nfs_file_localio.
+ *
+ * Returns a pointer to a struct nfsd_file or NULL.
+ */
+struct nfsd_file *
+nfs_local_open_fh(struct nfs_client *clp, const struct cred *cred,
+ struct nfs_fh *fh, struct nfs_file_localio *nfl,
+ const fmode_t mode)
+{
+ struct nfsd_file *nf, *new, __rcu **pnf;
+
+ if (!nfs_server_is_local(clp))
+ return NULL;
+ if (mode & ~(FMODE_READ | FMODE_WRITE))
+ return NULL;
+
+ if (mode & FMODE_WRITE)
+ pnf = &nfl->rw_file;
+ else
+ pnf = &nfl->ro_file;
+
+ new = NULL;
+ rcu_read_lock();
+ nf = rcu_dereference(*pnf);
+ if (!nf) {
+ rcu_read_unlock();
+ new = __nfs_local_open_fh(clp, cred, fh, nfl, mode);
+ if (IS_ERR(new))
+ return NULL;
+ /* try to swap in the pointer */
+ spin_lock(&clp->cl_uuid.lock);
+ nf = rcu_dereference_protected(*pnf, 1);
+ if (!nf) {
+ nf = new;
+ new = NULL;
+ rcu_assign_pointer(*pnf, nf);
+ }
+ spin_unlock(&clp->cl_uuid.lock);
+ rcu_read_lock();
+ }
+ nf = nfs_local_file_get(nf);
+ rcu_read_unlock();
+ if (new)
+ nfs_to_nfsd_file_put_local(new);
+ return nf;
+}
EXPORT_SYMBOL_GPL(nfs_local_open_fh);
static struct bio_vec *
@@ -347,7 +402,7 @@ nfs_local_pgio_release(struct nfs_local_kiocb *iocb)
{
struct nfs_pgio_header *hdr = iocb->hdr;
- nfs_to_nfsd_file_put_local(iocb->localio);
+ nfs_local_file_put(iocb->localio);
nfs_local_iocb_free(iocb);
nfs_local_hdr_release(hdr, hdr->task.tk_ops);
}
@@ -694,7 +749,7 @@ int nfs_local_doio(struct nfs_client *clp, struct nfsd_file *localio,
if (status != 0) {
if (status == -EAGAIN)
nfs_local_disable(clp);
- nfs_to_nfsd_file_put_local(localio);
+ nfs_local_file_put(localio);
hdr->task.tk_status = status;
nfs_local_hdr_release(hdr, call_ops);
}
@@ -745,7 +800,7 @@ nfs_local_release_commit_data(struct nfsd_file *localio,
struct nfs_commit_data *data,
const struct rpc_call_ops *call_ops)
{
- nfs_to_nfsd_file_put_local(localio);
+ nfs_local_file_put(localio);
call_ops->rpc_call_done(&data->task, data);
call_ops->rpc_release(data);
}
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index e27c07bd89290..11968dcb72431 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -961,8 +961,9 @@ static int nfs_generic_pg_pgios(struct nfs_pageio_descriptor *desc)
struct nfs_client *clp = NFS_SERVER(hdr->inode)->nfs_client;
struct nfsd_file *localio =
- nfs_local_open_fh(clp, hdr->cred,
- hdr->args.fh, hdr->args.context->mode);
+ nfs_local_open_fh(clp, hdr->cred, hdr->args.fh,
+ &hdr->args.context->nfl,
+ hdr->args.context->mode);
if (NFS_SERVER(hdr->inode)->nfs_client->cl_minorversion)
task_flags = RPC_TASK_MOVEABLE;
diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 50fa539611f5e..aa3d8bea3ec06 100644
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1826,7 +1826,8 @@ nfs_commit_list(struct inode *inode, struct list_head *head, int how,
task_flags = RPC_TASK_MOVEABLE;
localio = nfs_local_open_fh(NFS_SERVER(inode)->nfs_client, data->cred,
- data->args.fh, data->context->mode);
+ data->args.fh, &data->context->nfl,
+ data->context->mode);
return nfs_initiate_commit(NFS_CLIENT(inode), data, NFS_PROTO(inode),
data->mds_ops, how,
RPC_TASK_CRED_NOREF | task_flags, localio);
diff --git a/fs/nfs_common/nfslocalio.c b/fs/nfs_common/nfslocalio.c
index abc132166742e..35a2e48731df6 100644
--- a/fs/nfs_common/nfslocalio.c
+++ b/fs/nfs_common/nfslocalio.c
@@ -9,7 +9,7 @@
#include <linux/nfslocalio.h>
#include <linux/nfs3.h>
#include <linux/nfs4.h>
-#include <linux/nfs_fs_sb.h>
+#include <linux/nfs_fs.h>
#include <net/netns/generic.h>
MODULE_LICENSE("GPL");
@@ -151,9 +151,18 @@ void nfs_localio_invalidate_clients(struct list_head *cl_uuid_list)
}
EXPORT_SYMBOL_GPL(nfs_localio_invalidate_clients);
+static void nfs_uuid_add_file(nfs_uuid_t *nfs_uuid, struct nfs_file_localio *nfl)
+{
+ spin_lock(&nfs_uuid_lock);
+ if (!nfl->nfs_uuid)
+ rcu_assign_pointer(nfl->nfs_uuid, nfs_uuid);
+ spin_unlock(&nfs_uuid_lock);
+}
+
struct nfsd_file *nfs_open_local_fh(nfs_uuid_t *uuid,
struct rpc_clnt *rpc_clnt, const struct cred *cred,
- const struct nfs_fh *nfs_fh, const fmode_t fmode)
+ const struct nfs_fh *nfs_fh, struct nfs_file_localio *nfl,
+ const fmode_t fmode)
{
struct net *net;
struct nfsd_file *localio;
@@ -180,11 +189,50 @@ struct nfsd_file *nfs_open_local_fh(nfs_uuid_t *uuid,
cred, nfs_fh, fmode);
if (IS_ERR(localio))
nfs_to_nfsd_net_put(net);
+ else
+ nfs_uuid_add_file(uuid, nfl);
return localio;
}
EXPORT_SYMBOL_GPL(nfs_open_local_fh);
+void nfs_close_local_fh(struct nfs_file_localio *nfl)
+{
+ struct nfsd_file *ro_nf = NULL;
+ struct nfsd_file *rw_nf = NULL;
+ nfs_uuid_t *nfs_uuid;
+
+ rcu_read_lock();
+ nfs_uuid = rcu_dereference(nfl->nfs_uuid);
+ if (!nfs_uuid) {
+ /* regular (non-LOCALIO) NFS will hammer this */
+ rcu_read_unlock();
+ return;
+ }
+
+ ro_nf = rcu_access_pointer(nfl->ro_file);
+ rw_nf = rcu_access_pointer(nfl->rw_file);
+ if (ro_nf || rw_nf) {
+ spin_lock(&nfs_uuid_lock);
+ if (ro_nf)
+ ro_nf = rcu_dereference_protected(xchg(&nfl->ro_file, NULL), 1);
+ if (rw_nf)
+ rw_nf = rcu_dereference_protected(xchg(&nfl->rw_file, NULL), 1);
+
+ rcu_assign_pointer(nfl->nfs_uuid, NULL);
+ spin_unlock(&nfs_uuid_lock);
+ rcu_read_unlock();
+
+ if (ro_nf)
+ nfs_to_nfsd_file_put_local(ro_nf);
+ if (rw_nf)
+ nfs_to_nfsd_file_put_local(rw_nf);
+ return;
+ }
+ rcu_read_unlock();
+}
+EXPORT_SYMBOL_GPL(nfs_close_local_fh);
+
/*
* The NFS LOCALIO code needs to call into NFSD using various symbols,
* but cannot be statically linked, because that will make the NFS
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index 039898d70954f..67ae2c3f41d20 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -77,6 +77,23 @@ struct nfs_lock_context {
struct rcu_head rcu_head;
};
+struct nfs_file_localio {
+ struct nfsd_file __rcu *ro_file;
+ struct nfsd_file __rcu *rw_file;
+ struct list_head list;
+ void __rcu *nfs_uuid; /* opaque pointer to 'nfs_uuid_t' */
+};
+
+static inline void nfs_localio_file_init(struct nfs_file_localio *nfl)
+{
+#if IS_ENABLED(CONFIG_NFS_LOCALIO)
+ nfl->ro_file = NULL;
+ nfl->rw_file = NULL;
+ INIT_LIST_HEAD(&nfl->list);
+ nfl->nfs_uuid = NULL;
+#endif
+}
+
struct nfs4_state;
struct nfs_open_context {
struct nfs_lock_context lock_context;
@@ -87,15 +104,16 @@ struct nfs_open_context {
struct nfs4_state *state;
fmode_t mode;
+ int error;
unsigned long flags;
#define NFS_CONTEXT_BAD (2)
#define NFS_CONTEXT_UNLOCK (3)
#define NFS_CONTEXT_FILE_OPEN (4)
- int error;
- struct list_head list;
struct nfs4_threshold *mdsthreshold;
+ struct list_head list;
struct rcu_head rcu_head;
+ struct nfs_file_localio nfl;
};
struct nfs_open_dir_context {
diff --git a/include/linux/nfslocalio.h b/include/linux/nfslocalio.h
index 4d5583873f418..7cfc6720ed26d 100644
--- a/include/linux/nfslocalio.h
+++ b/include/linux/nfslocalio.h
@@ -6,10 +6,6 @@
#ifndef __LINUX_NFSLOCALIO_H
#define __LINUX_NFSLOCALIO_H
-
-/* nfsd_file structure is purposely kept opaque to NFS client */
-struct nfsd_file;
-
#if IS_ENABLED(CONFIG_NFS_LOCALIO)
#include <linux/module.h>
@@ -21,6 +17,7 @@ struct nfsd_file;
#include <net/net_namespace.h>
struct nfs_client;
+struct nfs_file_localio;
/*
* Useful to allow a client to negotiate if localio
@@ -52,6 +49,7 @@ extern struct nfsd_file *
nfsd_open_local_fh(struct net *, struct auth_domain *, struct rpc_clnt *,
const struct cred *, const struct nfs_fh *,
const fmode_t) __must_hold(rcu);
+void nfs_close_local_fh(struct nfs_file_localio *);
struct nfsd_localio_operations {
bool (*nfsd_serv_try_get)(struct net *);
@@ -73,7 +71,8 @@ extern const struct nfsd_localio_operations *nfs_to;
struct nfsd_file *nfs_open_local_fh(nfs_uuid_t *,
struct rpc_clnt *, const struct cred *,
- const struct nfs_fh *, const fmode_t);
+ const struct nfs_fh *, struct nfs_file_localio *,
+ const fmode_t);
static inline void nfs_to_nfsd_net_put(struct net *net)
{
@@ -100,12 +99,15 @@ static inline void nfs_to_nfsd_file_put_local(struct nfsd_file *localio)
}
#else /* CONFIG_NFS_LOCALIO */
-static inline void nfsd_localio_ops_init(void)
+
+struct nfs_file_localio;
+static inline void nfs_close_local_fh(struct nfs_file_localio *nfl)
{
}
-static inline void nfs_to_nfsd_file_put_local(struct nfsd_file *localio)
+static inline void nfsd_localio_ops_init(void)
{
}
+
#endif /* CONFIG_NFS_LOCALIO */
#endif /* __LINUX_NFSLOCALIO_H */
From 39972494e318a21b3059287909fc090186dbe60a Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Fri, 15 Nov 2024 20:40:58 -0500
Subject: [PATCH 09/28] nfsd: update percpu_ref to manage references on
nfsd_net
Holding a reference on nfsd_net is what is required, it was never
actually about ensuring nn->nfsd_serv available.
Move waiting for outstanding percpu references from
nfsd_destroy_serv() to nfsd_shutdown_net().
By moving it later it will be possible to invalidate localio clients
during nfsd_file_cache_shutdown_net() via __nfsd_file_cache_purge().
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfsd/nfssvc.c | 12 +++++++-----
1 file changed, 7 insertions(+), 5 deletions(-)
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 49e2f32102ab5..6ca5540424266 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -436,6 +436,10 @@ static void nfsd_shutdown_net(struct net *net)
if (!nn->nfsd_net_up)
return;
+
+ percpu_ref_kill_and_confirm(&nn->nfsd_serv_ref, nfsd_serv_done);
+ wait_for_completion(&nn->nfsd_serv_confirm_done);
+
nfsd_export_flush(net);
nfs4_state_shutdown_net(net);
nfsd_reply_cache_shutdown(nn);
@@ -444,7 +448,10 @@ static void nfsd_shutdown_net(struct net *net)
lockd_down(net);
nn->lockd_up = false;
}
+
+ wait_for_completion(&nn->nfsd_serv_free_done);
percpu_ref_exit(&nn->nfsd_serv_ref);
+
nn->nfsd_net_up = false;
nfsd_shutdown_generic();
}
@@ -526,11 +533,6 @@ void nfsd_destroy_serv(struct net *net)
lockdep_assert_held(&nfsd_mutex);
- percpu_ref_kill_and_confirm(&nn->nfsd_serv_ref, nfsd_serv_done);
- wait_for_completion(&nn->nfsd_serv_confirm_done);
- wait_for_completion(&nn->nfsd_serv_free_done);
- /* percpu_ref_exit is called in nfsd_shutdown_net */
-
spin_lock(&nfsd_notifier_lock);
nn->nfsd_serv = NULL;
spin_unlock(&nfsd_notifier_lock);
From b33f7dec3a67216123312c7bb752b8f6faa1c465 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Fri, 15 Nov 2024 20:40:59 -0500
Subject: [PATCH 10/28] nfsd: rename nfsd_serv_ prefixed methods and variables
with nfsd_net_
Also update Documentation/filesystems/nfs/localio.rst accordingly
and reduce the technical documentation debt that was previously
captured in that document.
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
Documentation/filesystems/nfs/localio.rst | 85 +++++++----------------
fs/nfs_common/nfslocalio.c | 10 ++-
fs/nfsd/filecache.c | 2 +-
fs/nfsd/localio.c | 4 +-
fs/nfsd/netns.h | 11 +--
fs/nfsd/nfssvc.c | 34 ++++-----
include/linux/nfslocalio.h | 12 ++--
7 files changed, 66 insertions(+), 92 deletions(-)
diff --git a/Documentation/filesystems/nfs/localio.rst b/Documentation/filesystems/nfs/localio.rst
index 20fc901a08f4d..7d2dbf75e96db 100644
--- a/Documentation/filesystems/nfs/localio.rst
+++ b/Documentation/filesystems/nfs/localio.rst
@@ -218,64 +218,30 @@ NFS Client and Server Interlock
===============================
LOCALIO provides the nfs_uuid_t object and associated interfaces to
-allow proper network namespace (net-ns) and NFSD object refcounting:
-
- We don't want to keep a long-term counted reference on each NFSD's
- net-ns in the client because that prevents a server container from
- completely shutting down.
-
- So we avoid taking a reference at all and rely on the per-cpu
- reference to the server (detailed below) being sufficient to keep
- the net-ns active. This involves allowing the NFSD's net-ns exit
- code to iterate all active clients and clear their ->net pointers
- (which are needed to find the per-cpu-refcount for the nfsd_serv).
-
- Details:
-
- - Embed nfs_uuid_t in nfs_client. nfs_uuid_t provides a list_head
- that can be used to find the client. It does add the 16-byte
- uuid_t to nfs_client so it is bigger than needed (given that
- uuid_t is only used during the initial NFS client and server
- LOCALIO handshake to determine if they are local to each other).
- If that is really a problem we can find a fix.
-
- - When the nfs server confirms that the uuid_t is local, it moves
- the nfs_uuid_t onto a per-net-ns list in NFSD's nfsd_net.
-
- - When each server's net-ns is shutting down - in a "pre_exit"
- handler, all these nfs_uuid_t have their ->net cleared. There is
- an rcu_synchronize() call between pre_exit() handlers and exit()
- handlers so any caller that sees nfs_uuid_t ->net as not NULL can
- safely manage the per-cpu-refcount for nfsd_serv.
-
- - The client's nfs_uuid_t is passed to nfsd_open_local_fh() so it
- can safely dereference ->net in a private rcu_read_lock() section
- to allow safe access to the associated nfsd_net and nfsd_serv.
-
-So LOCALIO required the introduction and use of NFSD's percpu_ref to
-interlock nfsd_destroy_serv() and nfsd_open_local_fh(), to ensure each
-nn->nfsd_serv is not destroyed while in use by nfsd_open_local_fh(), and
+allow proper network namespace (net-ns) and NFSD object refcounting.
+
+LOCALIO required the introduction and use of NFSD's percpu nfsd_net_ref
+to interlock nfsd_shutdown_net() and nfsd_open_local_fh(), to ensure
+each net-ns is not destroyed while in use by nfsd_open_local_fh(), and
warrants a more detailed explanation:
- nfsd_open_local_fh() uses nfsd_serv_try_get() before opening its
+ nfsd_open_local_fh() uses nfsd_net_try_get() before opening its
nfsd_file handle and then the caller (NFS client) must drop the
- reference for the nfsd_file and associated nn->nfsd_serv using
- nfs_file_put_local() once it has completed its IO.
+ reference for the nfsd_file and associated net-ns using
+ nfsd_file_put_local() once it has completed its IO.
This interlock working relies heavily on nfsd_open_local_fh() being
afforded the ability to safely deal with the possibility that the
NFSD's net-ns (and nfsd_net by association) may have been destroyed
- by nfsd_destroy_serv() via nfsd_shutdown_net() -- which is only
- possible given the nfs_uuid_t ->net pointer managemenet detailed
- above.
-
-All told, this elaborate interlock of the NFS client and server has been
-verified to fix an easy to hit crash that would occur if an NFSD
-instance running in a container, with a LOCALIO client mounted, is
-shutdown. Upon restart of the container and associated NFSD the client
-would go on to crash due to NULL pointer dereference that occurred due
-to the LOCALIO client's attempting to nfsd_open_local_fh(), using
-nn->nfsd_serv, without having a proper reference on nn->nfsd_serv.
+ by nfsd_destroy_serv() via nfsd_shutdown_net().
+
+This interlock of the NFS client and server has been verified to fix an
+easy to hit crash that would occur if an NFSD instance running in a
+container, with a LOCALIO client mounted, is shutdown. Upon restart of
+the container and associated NFSD, the client would go on to crash due
+to NULL pointer dereference that occurred due to the LOCALIO client's
+attempting to nfsd_open_local_fh() without having a proper reference on
+NFSD's net-ns.
NFS Client issues IO instead of Server
======================================
@@ -308,16 +274,19 @@ fs/nfs/localio.c:nfs_local_commit().
With normal NFS that makes use of RPC to issue IO to the server, if an
application uses O_DIRECT the NFS client will bypass the pagecache but
-the NFS server will not. Because the NFS server's use of buffered IO
-affords applications to be less precise with their alignment when
-issuing IO to the NFS client. LOCALIO can be configured to use O_DIRECT
-semantics by setting the 'localio_O_DIRECT_semantics' nfs module
+the NFS server will not. The NFS server's use of buffered IO affords
+applications to be less precise with their alignment when issuing IO to
+the NFS client. But if all applications properly align their IO, LOCALIO
+can be configured to use end-to-end O_DIRECT semantics from the NFS
+client to the underlying local filesystem, that it is sharing with
+the NFS server, by setting the 'localio_O_DIRECT_semantics' nfs module
parameter to Y, e.g.:
- echo Y > /sys/module/nfs/parameters/localio_O_DIRECT_semantics
+ echo Y > /sys/module/nfs/parameters/localio_O_DIRECT_semantics
-Once enabled, it will cause LOCALIO to use O_DIRECT semantics (this may
-cause IO to fail if applications do not properly align their IO).
+Once enabled, it will cause LOCALIO to use end-to-end O_DIRECT semantics
+(but again, this may cause IO to fail if applications do not properly
+align their IO).
Security
========
diff --git a/fs/nfs_common/nfslocalio.c b/fs/nfs_common/nfslocalio.c
index 35a2e48731df6..e75cd21f4c8bc 100644
--- a/fs/nfs_common/nfslocalio.c
+++ b/fs/nfs_common/nfslocalio.c
@@ -159,6 +159,10 @@ static void nfs_uuid_add_file(nfs_uuid_t *nfs_uuid, struct nfs_file_localio *nfl
spin_unlock(&nfs_uuid_lock);
}
+/*
+ * Caller is responsible for calling nfsd_net_put and
+ * nfsd_file_put (via nfs_to_nfsd_file_put_local).
+ */
struct nfsd_file *nfs_open_local_fh(nfs_uuid_t *uuid,
struct rpc_clnt *rpc_clnt, const struct cred *cred,
const struct nfs_fh *nfs_fh, struct nfs_file_localio *nfl,
@@ -171,7 +175,7 @@ struct nfsd_file *nfs_open_local_fh(nfs_uuid_t *uuid,
* Not running in nfsd context, so must safely get reference on nfsd_serv.
* But the server may already be shutting down, if so disallow new localio.
* uuid->net is NOT a counted reference, but rcu_read_lock() ensures that
- * if uuid->net is not NULL, then calling nfsd_serv_try_get() is safe
+ * if uuid->net is not NULL, then calling nfsd_net_try_get() is safe
* and if it succeeds we will have an implied reference to the net.
*
* Otherwise NFS may not have ref on NFSD and therefore cannot safely
@@ -179,12 +183,12 @@ struct nfsd_file *nfs_open_local_fh(nfs_uuid_t *uuid,
*/
rcu_read_lock();
net = rcu_dereference(uuid->net);
- if (!net || !nfs_to->nfsd_serv_try_get(net)) {
+ if (!net || !nfs_to->nfsd_net_try_get(net)) {
rcu_read_unlock();
return ERR_PTR(-ENXIO);
}
rcu_read_unlock();
- /* We have an implied reference to net thanks to nfsd_serv_try_get */
+ /* We have an implied reference to net thanks to nfsd_net_try_get */
localio = nfs_to->nfsd_open_local_fh(net, uuid->dom, rpc_clnt,
cred, nfs_fh, fmode);
if (IS_ERR(localio))
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index a1cdba42c4fad..1c3baa74e2df8 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -391,7 +391,7 @@ nfsd_file_put(struct nfsd_file *nf)
}
/**
- * nfsd_file_put_local - put nfsd_file reference and arm nfsd_serv_put in caller
+ * nfsd_file_put_local - put nfsd_file reference and arm nfsd_net_put in caller
* @nf: nfsd_file of which to put the reference
*
* First save the associated net to return to caller, then put
diff --git a/fs/nfsd/localio.c b/fs/nfsd/localio.c
index 8beda4c851119..f9a91cd3b5ec7 100644
--- a/fs/nfsd/localio.c
+++ b/fs/nfsd/localio.c
@@ -25,8 +25,8 @@
#include "cache.h"
static const struct nfsd_localio_operations nfsd_localio_ops = {
- .nfsd_serv_try_get = nfsd_serv_try_get,
- .nfsd_serv_put = nfsd_serv_put,
+ .nfsd_net_try_get = nfsd_net_try_get,
+ .nfsd_net_put = nfsd_net_put,
.nfsd_open_local_fh = nfsd_open_local_fh,
.nfsd_file_put_local = nfsd_file_put_local,
.nfsd_file_get = nfsd_file_get,
diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index 26f7b34d1a030..8faef59d71229 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -140,9 +140,10 @@ struct nfsd_net {
struct svc_info nfsd_info;
#define nfsd_serv nfsd_info.serv
- struct percpu_ref nfsd_serv_ref;
- struct completion nfsd_serv_confirm_done;
- struct completion nfsd_serv_free_done;
+
+ struct percpu_ref nfsd_net_ref;
+ struct completion nfsd_net_confirm_done;
+ struct completion nfsd_net_free_done;
/*
* clientid and stateid data for construction of net unique COPY
@@ -229,8 +230,8 @@ struct nfsd_net {
extern bool nfsd_support_version(int vers);
extern unsigned int nfsd_net_id;
-bool nfsd_serv_try_get(struct net *net);
-void nfsd_serv_put(struct net *net);
+bool nfsd_net_try_get(struct net *net);
+void nfsd_net_put(struct net *net);
void nfsd_copy_write_verifier(__be32 verf[2], struct nfsd_net *nn);
void nfsd_reset_write_verifier(struct nfsd_net *nn);
diff --git a/fs/nfsd/nfssvc.c b/fs/nfsd/nfssvc.c
index 6ca5540424266..e937e2d0ce62c 100644
--- a/fs/nfsd/nfssvc.c
+++ b/fs/nfsd/nfssvc.c
@@ -214,32 +214,32 @@ int nfsd_minorversion(struct nfsd_net *nn, u32 minorversion, enum vers_op change
return 0;
}
-bool nfsd_serv_try_get(struct net *net) __must_hold(rcu)
+bool nfsd_net_try_get(struct net *net) __must_hold(rcu)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- return (nn && percpu_ref_tryget_live(&nn->nfsd_serv_ref));
+ return (nn && percpu_ref_tryget_live(&nn->nfsd_net_ref));
}
-void nfsd_serv_put(struct net *net) __must_hold(rcu)
+void nfsd_net_put(struct net *net) __must_hold(rcu)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- percpu_ref_put(&nn->nfsd_serv_ref);
+ percpu_ref_put(&nn->nfsd_net_ref);
}
-static void nfsd_serv_done(struct percpu_ref *ref)
+static void nfsd_net_done(struct percpu_ref *ref)
{
- struct nfsd_net *nn = container_of(ref, struct nfsd_net, nfsd_serv_ref);
+ struct nfsd_net *nn = container_of(ref, struct nfsd_net, nfsd_net_ref);
- complete(&nn->nfsd_serv_confirm_done);
+ complete(&nn->nfsd_net_confirm_done);
}
-static void nfsd_serv_free(struct percpu_ref *ref)
+static void nfsd_net_free(struct percpu_ref *ref)
{
- struct nfsd_net *nn = container_of(ref, struct nfsd_net, nfsd_serv_ref);
+ struct nfsd_net *nn = container_of(ref, struct nfsd_net, nfsd_net_ref);
- complete(&nn->nfsd_serv_free_done);
+ complete(&nn->nfsd_net_free_done);
}
/*
@@ -437,8 +437,8 @@ static void nfsd_shutdown_net(struct net *net)
if (!nn->nfsd_net_up)
return;
- percpu_ref_kill_and_confirm(&nn->nfsd_serv_ref, nfsd_serv_done);
- wait_for_completion(&nn->nfsd_serv_confirm_done);
+ percpu_ref_kill_and_confirm(&nn->nfsd_net_ref, nfsd_net_done);
+ wait_for_completion(&nn->nfsd_net_confirm_done);
nfsd_export_flush(net);
nfs4_state_shutdown_net(net);
@@ -449,8 +449,8 @@ static void nfsd_shutdown_net(struct net *net)
nn->lockd_up = false;
}
- wait_for_completion(&nn->nfsd_serv_free_done);
- percpu_ref_exit(&nn->nfsd_serv_ref);
+ wait_for_completion(&nn->nfsd_net_free_done);
+ percpu_ref_exit(&nn->nfsd_net_ref);
nn->nfsd_net_up = false;
nfsd_shutdown_generic();
@@ -654,12 +654,12 @@ int nfsd_create_serv(struct net *net)
if (nn->nfsd_serv)
return 0;
- error = percpu_ref_init(&nn->nfsd_serv_ref, nfsd_serv_free,
+ error = percpu_ref_init(&nn->nfsd_net_ref, nfsd_net_free,
0, GFP_KERNEL);
if (error)
return error;
- init_completion(&nn->nfsd_serv_free_done);
- init_completion(&nn->nfsd_serv_confirm_done);
+ init_completion(&nn->nfsd_net_free_done);
+ init_completion(&nn->nfsd_net_confirm_done);
if (nfsd_max_blksize == 0)
nfsd_max_blksize = nfsd_get_default_max_blksize();
diff --git a/include/linux/nfslocalio.h b/include/linux/nfslocalio.h
index 7cfc6720ed26d..aa2b5c6561ab0 100644
--- a/include/linux/nfslocalio.h
+++ b/include/linux/nfslocalio.h
@@ -52,8 +52,8 @@ nfsd_open_local_fh(struct net *, struct auth_domain *, struct rpc_clnt *,
void nfs_close_local_fh(struct nfs_file_localio *);
struct nfsd_localio_operations {
- bool (*nfsd_serv_try_get)(struct net *);
- void (*nfsd_serv_put)(struct net *);
+ bool (*nfsd_net_try_get)(struct net *);
+ void (*nfsd_net_put)(struct net *);
struct nfsd_file *(*nfsd_open_local_fh)(struct net *,
struct auth_domain *,
struct rpc_clnt *,
@@ -77,12 +77,12 @@ struct nfsd_file *nfs_open_local_fh(nfs_uuid_t *,
static inline void nfs_to_nfsd_net_put(struct net *net)
{
/*
- * Once reference to nfsd_serv is dropped, NFSD could be
- * unloaded, so ensure safe return from nfsd_file_put_local()
- * by always taking RCU.
+ * Once reference to net (and associated nfsd_serv) is dropped, NFSD
+ * could be unloaded, so ensure safe return from nfsd_net_put() by
+ * always taking RCU.
*/
rcu_read_lock();
- nfs_to->nfsd_serv_put(net);
+ nfs_to->nfsd_net_put(net);
rcu_read_unlock();
}
From f9c3e1ba072d0e21e75f7033d75a134549e8ed43 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Fri, 15 Nov 2024 20:41:00 -0500
Subject: [PATCH 11/28] nfsd: nfsd_file_acquire_local no longer returns GC'd
nfsd_file
Now that LOCALIO no longer leans on NFSD's filecache for caching open
files (and instead uses NFS client-side open nfsd_file caching) there
is no need to use NFSD filecache's GC feature. Avoiding GC will speed
up nfsd_file initial opens.
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Acked-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfsd/filecache.c | 9 ++++-----
1 file changed, 4 insertions(+), 5 deletions(-)
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 1c3baa74e2df8..09dd708584c1f 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -1222,10 +1222,9 @@ nfsd_file_acquire(struct svc_rqst *rqstp, struct svc_fh *fhp,
* a file. The security implications of this should be carefully
* considered before use.
*
- * The nfsd_file object returned by this API is reference-counted
- * and garbage-collected. The object is retained for a few
- * seconds after the final nfsd_file_put() in case the caller
- * wants to re-use it.
+ * The nfsd_file_object returned by this API is reference-counted
+ * but not garbage-collected. The object is unhashed after the
+ * final nfsd_file_put().
*
* Return values:
* %nfs_ok - @pnf points to an nfsd_file with its reference
@@ -1247,7 +1246,7 @@ nfsd_file_acquire_local(struct net *net, struct svc_cred *cred,
__be32 beres;
beres = nfsd_file_do_acquire(NULL, net, cred, client,
- fhp, may_flags, NULL, pnf, true);
+ fhp, may_flags, NULL, pnf, false);
revert_creds(save_cred);
return beres;
}
From e1943f4eb8d531b0b65b22d4181c6a205226b006 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Fri, 15 Nov 2024 20:41:01 -0500
Subject: [PATCH 12/28] nfs_common: rename nfslocalio nfs_uuid_lock to
nfs_uuids_lock
This global spinlock protects all nfs_uuid_t relative to the global
nfs_uuids list. A later commit will split this global spinlock so
prepare by renaming this lock to reflect its intended narrow scope.
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs_common/nfslocalio.c | 34 +++++++++++++++++-----------------
fs/nfsd/localio.c | 2 +-
2 files changed, 18 insertions(+), 18 deletions(-)
diff --git a/fs/nfs_common/nfslocalio.c b/fs/nfs_common/nfslocalio.c
index e75cd21f4c8bc..5fa3f47b442e9 100644
--- a/fs/nfs_common/nfslocalio.c
+++ b/fs/nfs_common/nfslocalio.c
@@ -15,11 +15,11 @@
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("NFS localio protocol bypass support");
-static DEFINE_SPINLOCK(nfs_uuid_lock);
+static DEFINE_SPINLOCK(nfs_uuids_lock);
/*
* Global list of nfs_uuid_t instances
- * that is protected by nfs_uuid_lock.
+ * that is protected by nfs_uuids_lock.
*/
static LIST_HEAD(nfs_uuids);
@@ -34,15 +34,15 @@ EXPORT_SYMBOL_GPL(nfs_uuid_init);
bool nfs_uuid_begin(nfs_uuid_t *nfs_uuid)
{
- spin_lock(&nfs_uuid_lock);
+ spin_lock(&nfs_uuids_lock);
/* Is this nfs_uuid already in use? */
if (!list_empty(&nfs_uuid->list)) {
- spin_unlock(&nfs_uuid_lock);
+ spin_unlock(&nfs_uuids_lock);
return false;
}
uuid_gen(&nfs_uuid->uuid);
list_add_tail(&nfs_uuid->list, &nfs_uuids);
- spin_unlock(&nfs_uuid_lock);
+ spin_unlock(&nfs_uuids_lock);
return true;
}
@@ -51,10 +51,10 @@ EXPORT_SYMBOL_GPL(nfs_uuid_begin);
void nfs_uuid_end(nfs_uuid_t *nfs_uuid)
{
if (nfs_uuid->net == NULL) {
- spin_lock(&nfs_uuid_lock);
+ spin_lock(&nfs_uuids_lock);
if (nfs_uuid->net == NULL)
list_del_init(&nfs_uuid->list);
- spin_unlock(&nfs_uuid_lock);
+ spin_unlock(&nfs_uuids_lock);
}
}
EXPORT_SYMBOL_GPL(nfs_uuid_end);
@@ -78,7 +78,7 @@ void nfs_uuid_is_local(const uuid_t *uuid, struct list_head *list,
{
nfs_uuid_t *nfs_uuid;
- spin_lock(&nfs_uuid_lock);
+ spin_lock(&nfs_uuids_lock);
nfs_uuid = nfs_uuid_lookup_locked(uuid);
if (nfs_uuid) {
kref_get(&dom->ref);
@@ -94,7 +94,7 @@ void nfs_uuid_is_local(const uuid_t *uuid, struct list_head *list,
__module_get(mod);
nfsd_mod = mod;
}
- spin_unlock(&nfs_uuid_lock);
+ spin_unlock(&nfs_uuids_lock);
}
EXPORT_SYMBOL_GPL(nfs_uuid_is_local);
@@ -128,9 +128,9 @@ void nfs_localio_disable_client(struct nfs_client *clp)
spin_lock(&nfs_uuid->lock);
if (test_and_clear_bit(NFS_CS_LOCAL_IO, &clp->cl_flags)) {
- spin_lock(&nfs_uuid_lock);
+ spin_lock(&nfs_uuids_lock);
nfs_uuid_put_locked(nfs_uuid);
- spin_unlock(&nfs_uuid_lock);
+ spin_unlock(&nfs_uuids_lock);
}
spin_unlock(&nfs_uuid->lock);
}
@@ -140,23 +140,23 @@ void nfs_localio_invalidate_clients(struct list_head *cl_uuid_list)
{
nfs_uuid_t *nfs_uuid, *tmp;
- spin_lock(&nfs_uuid_lock);
+ spin_lock(&nfs_uuids_lock);
list_for_each_entry_safe(nfs_uuid, tmp, cl_uuid_list, list) {
struct nfs_client *clp =
container_of(nfs_uuid, struct nfs_client, cl_uuid);
nfs_localio_disable_client(clp);
}
- spin_unlock(&nfs_uuid_lock);
+ spin_unlock(&nfs_uuids_lock);
}
EXPORT_SYMBOL_GPL(nfs_localio_invalidate_clients);
static void nfs_uuid_add_file(nfs_uuid_t *nfs_uuid, struct nfs_file_localio *nfl)
{
- spin_lock(&nfs_uuid_lock);
+ spin_lock(&nfs_uuids_lock);
if (!nfl->nfs_uuid)
rcu_assign_pointer(nfl->nfs_uuid, nfs_uuid);
- spin_unlock(&nfs_uuid_lock);
+ spin_unlock(&nfs_uuids_lock);
}
/*
@@ -217,14 +217,14 @@ void nfs_close_local_fh(struct nfs_file_localio *nfl)
ro_nf = rcu_access_pointer(nfl->ro_file);
rw_nf = rcu_access_pointer(nfl->rw_file);
if (ro_nf || rw_nf) {
- spin_lock(&nfs_uuid_lock);
+ spin_lock(&nfs_uuids_lock);
if (ro_nf)
ro_nf = rcu_dereference_protected(xchg(&nfl->ro_file, NULL), 1);
if (rw_nf)
rw_nf = rcu_dereference_protected(xchg(&nfl->rw_file, NULL), 1);
rcu_assign_pointer(nfl->nfs_uuid, NULL);
- spin_unlock(&nfs_uuid_lock);
+ spin_unlock(&nfs_uuids_lock);
rcu_read_unlock();
if (ro_nf)
diff --git a/fs/nfsd/localio.c b/fs/nfsd/localio.c
index f9a91cd3b5ec7..2ae07161b9195 100644
--- a/fs/nfsd/localio.c
+++ b/fs/nfsd/localio.c
@@ -54,7 +54,7 @@ void nfsd_localio_ops_init(void)
* avoid all the NFS overhead with reads, writes and commits.
*
* On successful return, returned nfsd_file will have its nf_net member
- * set. Caller (NFS client) is responsible for calling nfsd_serv_put and
+ * set. Caller (NFS client) is responsible for calling nfsd_net_put and
* nfsd_file_put (via nfs_to_nfsd_file_put_local).
*/
struct nfsd_file *
From 085804110aa13eac7f763d8d5cfe3a8220e35222 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Fri, 15 Nov 2024 20:41:02 -0500
Subject: [PATCH 13/28] nfs_common: track all open nfsd_files per LOCALIO
nfs_client
This tracking enables __nfsd_file_cache_purge() to call
nfs_localio_invalidate_clients(), upon shutdown or export change, to
nfs_close_local_fh() all open nfsd_files that are still cached by the
LOCALIO nfs clients associated with nfsd_net that is being shutdown.
Now that the client must track all open nfsd_files there was more work
than necessary being done with the global nfs_uuids_lock contended.
This manifested in various RCU issues, e.g.:
hrtimer: interrupt took 47969440 ns
rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
Use nfs_uuid->lock to protect all nfs_uuid_t members, instead of
nfs_uuids_lock, once nfs_uuid_is_local() adds the client to
nn->local_clients.
Also add 'local_clients_lock' to 'struct nfsd_net' to protect
nn->local_clients. And store a pointer to spinlock in the 'list_lock'
member of nfs_uuid_t so nfs_localio_disable_client() can use it to
avoid taking the global nfs_uuids_lock.
In combination, these split out locks eliminate the use of the single
nfslocalio.c global nfs_uuids_lock in the IO paths (open and close).
Also refactored associated fs/nfs_common/nfslocalio.c methods' locking
to reduce work performed with spinlocks held in general.
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs_common/nfslocalio.c | 170 +++++++++++++++++++++++++++----------
fs/nfsd/filecache.c | 9 ++
fs/nfsd/localio.c | 1 +
fs/nfsd/netns.h | 1 +
fs/nfsd/nfsctl.c | 4 +-
include/linux/nfslocalio.h | 8 +-
6 files changed, 145 insertions(+), 48 deletions(-)
diff --git a/fs/nfs_common/nfslocalio.c b/fs/nfs_common/nfslocalio.c
index 5fa3f47b442e9..cfb61871fb1e0 100644
--- a/fs/nfs_common/nfslocalio.c
+++ b/fs/nfs_common/nfslocalio.c
@@ -23,27 +23,49 @@ static DEFINE_SPINLOCK(nfs_uuids_lock);
*/
static LIST_HEAD(nfs_uuids);
+/*
+ * Lock ordering:
+ * 1: nfs_uuid->lock
+ * 2: nfs_uuids_lock
+ * 3: nfs_uuid->list_lock (aka nn->local_clients_lock)
+ *
+ * May skip locks in select cases, but never hold multiple
+ * locks out of order.
+ */
+
void nfs_uuid_init(nfs_uuid_t *nfs_uuid)
{
nfs_uuid->net = NULL;
nfs_uuid->dom = NULL;
+ nfs_uuid->list_lock = NULL;
INIT_LIST_HEAD(&nfs_uuid->list);
+ INIT_LIST_HEAD(&nfs_uuid->files);
spin_lock_init(&nfs_uuid->lock);
}
EXPORT_SYMBOL_GPL(nfs_uuid_init);
bool nfs_uuid_begin(nfs_uuid_t *nfs_uuid)
{
+ spin_lock(&nfs_uuid->lock);
+ if (nfs_uuid->net) {
+ /* This nfs_uuid is already in use */
+ spin_unlock(&nfs_uuid->lock);
+ return false;
+ }
+
spin_lock(&nfs_uuids_lock);
- /* Is this nfs_uuid already in use? */
if (!list_empty(&nfs_uuid->list)) {
+ /* This nfs_uuid is already in use */
spin_unlock(&nfs_uuids_lock);
+ spin_unlock(&nfs_uuid->lock);
return false;
}
- uuid_gen(&nfs_uuid->uuid);
list_add_tail(&nfs_uuid->list, &nfs_uuids);
spin_unlock(&nfs_uuids_lock);
+ uuid_gen(&nfs_uuid->uuid);
+ spin_unlock(&nfs_uuid->lock);
+
return true;
}
EXPORT_SYMBOL_GPL(nfs_uuid_begin);
@@ -51,11 +73,15 @@ EXPORT_SYMBOL_GPL(nfs_uuid_begin);
void nfs_uuid_end(nfs_uuid_t *nfs_uuid)
{
if (nfs_uuid->net == NULL) {
- spin_lock(&nfs_uuids_lock);
- if (nfs_uuid->net == NULL)
+ spin_lock(&nfs_uuid->lock);
+ if (nfs_uuid->net == NULL) {
+ /* Not local, remove from nfs_uuids */
+ spin_lock(&nfs_uuids_lock);
list_del_init(&nfs_uuid->list);
- spin_unlock(&nfs_uuids_lock);
- }
+ spin_unlock(&nfs_uuids_lock);
+ }
+ spin_unlock(&nfs_uuid->lock);
+ }
}
EXPORT_SYMBOL_GPL(nfs_uuid_end);
@@ -73,28 +99,39 @@ static nfs_uuid_t * nfs_uuid_lookup_locked(const uuid_t *uuid)
static struct module *nfsd_mod;
void nfs_uuid_is_local(const uuid_t *uuid, struct list_head *list,
- struct net *net, struct auth_domain *dom,
- struct module *mod)
+ spinlock_t *list_lock, struct net *net,
+ struct auth_domain *dom, struct module *mod)
{
nfs_uuid_t *nfs_uuid;
spin_lock(&nfs_uuids_lock);
nfs_uuid = nfs_uuid_lookup_locked(uuid);
- if (nfs_uuid) {
- kref_get(&dom->ref);
- nfs_uuid->dom = dom;
- /*
- * We don't hold a ref on the net, but instead put
- * ourselves on a list so the net pointer can be
- * invalidated.
- */
- list_move(&nfs_uuid->list, list);
- rcu_assign_pointer(nfs_uuid->net, net);
-
- __module_get(mod);
- nfsd_mod = mod;
+ if (!nfs_uuid) {
+ spin_unlock(&nfs_uuids_lock);
+ return;
}
+
+ /*
+ * We don't hold a ref on the net, but instead put
+ * ourselves on @list (nn->local_clients) so the net
+ * pointer can be invalidated.
+ */
+ spin_lock(list_lock); /* list_lock is nn->local_clients_lock */
+ list_move(&nfs_uuid->list, list);
+ spin_unlock(list_lock);
+
spin_unlock(&nfs_uuids_lock);
+ /* Once nfs_uuid is parented to @list, avoid global nfs_uuids_lock */
+ spin_lock(&nfs_uuid->lock);
+
+ __module_get(mod);
+ nfsd_mod = mod;
+
+ nfs_uuid->list_lock = list_lock;
+ kref_get(&dom->ref);
+ nfs_uuid->dom = dom;
+ rcu_assign_pointer(nfs_uuid->net, net);
+ spin_unlock(&nfs_uuid->lock);
}
EXPORT_SYMBOL_GPL(nfs_uuid_is_local);
@@ -108,55 +145,96 @@ void nfs_localio_enable_client(struct nfs_client *clp)
}
EXPORT_SYMBOL_GPL(nfs_localio_enable_client);
-static void nfs_uuid_put_locked(nfs_uuid_t *nfs_uuid)
+/*
+ * Cleanup the nfs_uuid_t embedded in an nfs_client.
+ * This is the long-form of nfs_uuid_init().
+ */
+static void nfs_uuid_put(nfs_uuid_t *nfs_uuid)
{
- if (!nfs_uuid->net)
+ LIST_HEAD(local_files);
+ struct nfs_file_localio *nfl, *tmp;
+
+ spin_lock(&nfs_uuid->lock);
+ if (unlikely(!nfs_uuid->net)) {
+ spin_unlock(&nfs_uuid->lock);
return;
- module_put(nfsd_mod);
+ }
RCU_INIT_POINTER(nfs_uuid->net, NULL);
if (nfs_uuid->dom) {
auth_domain_put(nfs_uuid->dom);
nfs_uuid->dom = NULL;
}
- list_del_init(&nfs_uuid->list);
+
+ list_splice_init(&nfs_uuid->files, &local_files);
+ spin_unlock(&nfs_uuid->lock);
+
+ /* Walk list of files and ensure their last references dropped */
+ list_for_each_entry_safe(nfl, tmp, &local_files, list) {
+ nfs_close_local_fh(nfl);
+ cond_resched();
+ }
+
+ spin_lock(&nfs_uuid->lock);
+ BUG_ON(!list_empty(&nfs_uuid->files));
+
+ /* Remove client from nn->local_clients */
+ if (nfs_uuid->list_lock) {
+ spin_lock(nfs_uuid->list_lock);
+ BUG_ON(list_empty(&nfs_uuid->list));
+ list_del_init(&nfs_uuid->list);
+ spin_unlock(nfs_uuid->list_lock);
+ nfs_uuid->list_lock = NULL;
+ }
+
+ module_put(nfsd_mod);
+ spin_unlock(&nfs_uuid->lock);
}
void nfs_localio_disable_client(struct nfs_client *clp)
{
- nfs_uuid_t *nfs_uuid = &clp->cl_uuid;
+ nfs_uuid_t *nfs_uuid = NULL;
- spin_lock(&nfs_uuid->lock);
+ spin_lock(&clp->cl_uuid.lock); /* aka &nfs_uuid->lock */
if (test_and_clear_bit(NFS_CS_LOCAL_IO, &clp->cl_flags)) {
- spin_lock(&nfs_uuids_lock);
- nfs_uuid_put_locked(nfs_uuid);
- spin_unlock(&nfs_uuids_lock);
+ /* &clp->cl_uuid is always not NULL, using as bool here */
+ nfs_uuid = &clp->cl_uuid;
}
- spin_unlock(&nfs_uuid->lock);
+ spin_unlock(&clp->cl_uuid.lock);
+
+ if (nfs_uuid)
+ nfs_uuid_put(nfs_uuid);
}
EXPORT_SYMBOL_GPL(nfs_localio_disable_client);
-void nfs_localio_invalidate_clients(struct list_head *cl_uuid_list)
+void nfs_localio_invalidate_clients(struct list_head *nn_local_clients,
+ spinlock_t *nn_local_clients_lock)
{
+ LIST_HEAD(local_clients);
nfs_uuid_t *nfs_uuid, *tmp;
-
- spin_lock(&nfs_uuids_lock);
- list_for_each_entry_safe(nfs_uuid, tmp, cl_uuid_list, list) {
- struct nfs_client *clp =
- container_of(nfs_uuid, struct nfs_client, cl_uuid);
-
+ struct nfs_client *clp;
+
+ spin_lock(nn_local_clients_lock);
+ list_splice_init(nn_local_clients, &local_clients);
+ spin_unlock(nn_local_clients_lock);
+ list_for_each_entry_safe(nfs_uuid, tmp, &local_clients, list) {
+ if (WARN_ON(nfs_uuid->list_lock != nn_local_clients_lock))
+ break;
+ clp = container_of(nfs_uuid, struct nfs_client, cl_uuid);
nfs_localio_disable_client(clp);
}
- spin_unlock(&nfs_uuids_lock);
}
EXPORT_SYMBOL_GPL(nfs_localio_invalidate_clients);
static void nfs_uuid_add_file(nfs_uuid_t *nfs_uuid, struct nfs_file_localio *nfl)
{
- spin_lock(&nfs_uuids_lock);
- if (!nfl->nfs_uuid)
+ /* Add nfl to nfs_uuid->files if it isn't already */
+ spin_lock(&nfs_uuid->lock);
+ if (list_empty(&nfl->list)) {
rcu_assign_pointer(nfl->nfs_uuid, nfs_uuid);
- spin_unlock(&nfs_uuids_lock);
+ list_add_tail(&nfl->list, &nfs_uuid->files);
+ }
+ spin_unlock(&nfs_uuid->lock);
}
/*
@@ -217,14 +295,16 @@ void nfs_close_local_fh(struct nfs_file_localio *nfl)
ro_nf = rcu_access_pointer(nfl->ro_file);
rw_nf = rcu_access_pointer(nfl->rw_file);
if (ro_nf || rw_nf) {
- spin_lock(&nfs_uuids_lock);
+ spin_lock(&nfs_uuid->lock);
if (ro_nf)
ro_nf = rcu_dereference_protected(xchg(&nfl->ro_file, NULL), 1);
if (rw_nf)
rw_nf = rcu_dereference_protected(xchg(&nfl->rw_file, NULL), 1);
- rcu_assign_pointer(nfl->nfs_uuid, NULL);
- spin_unlock(&nfs_uuids_lock);
+ /* Remove nfl from nfs_uuid->files list */
+ RCU_INIT_POINTER(nfl->nfs_uuid, NULL);
+ list_del_init(&nfl->list);
+ spin_unlock(&nfs_uuid->lock);
rcu_read_unlock();
if (ro_nf)
diff --git a/fs/nfsd/filecache.c b/fs/nfsd/filecache.c
index 09dd708584c1f..2adf95e2b3792 100644
--- a/fs/nfsd/filecache.c
+++ b/fs/nfsd/filecache.c
@@ -39,6 +39,7 @@
#include <linux/fsnotify.h>
#include <linux/seq_file.h>
#include <linux/rhashtable.h>
+#include <linux/nfslocalio.h>
#include "vfs.h"
#include "nfsd.h"
@@ -833,6 +834,14 @@ __nfsd_file_cache_purge(struct net *net)
struct nfsd_file *nf;
LIST_HEAD(dispose);
+#if IS_ENABLED(CONFIG_NFS_LOCALIO)
+ if (net) {
+ struct nfsd_net *nn = net_generic(net, nfsd_net_id);
+ nfs_localio_invalidate_clients(&nn->local_clients,
+ &nn->local_clients_lock);
+ }
+#endif
+
rhltable_walk_enter(&nfsd_file_rhltable, &iter);
do {
rhashtable_walk_start(&iter);
diff --git a/fs/nfsd/localio.c b/fs/nfsd/localio.c
index 2ae07161b9195..238647fa379e3 100644
--- a/fs/nfsd/localio.c
+++ b/fs/nfsd/localio.c
@@ -116,6 +116,7 @@ static __be32 localio_proc_uuid_is_local(struct svc_rqst *rqstp)
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
nfs_uuid_is_local(&argp->uuid, &nn->local_clients,
+ &nn->local_clients_lock,
net, rqstp->rq_client, THIS_MODULE);
return rpc_success;
diff --git a/fs/nfsd/netns.h b/fs/nfsd/netns.h
index 8faef59d71229..187c4140b1913 100644
--- a/fs/nfsd/netns.h
+++ b/fs/nfsd/netns.h
@@ -220,6 +220,7 @@ struct nfsd_net {
#if IS_ENABLED(CONFIG_NFS_LOCALIO)
/* Local clients to be invalidated when net is shut down */
+ spinlock_t local_clients_lock;
struct list_head local_clients;
#endif
};
diff --git a/fs/nfsd/nfsctl.c b/fs/nfsd/nfsctl.c
index 727904d8a4d01..70347b0ecdc43 100644
--- a/fs/nfsd/nfsctl.c
+++ b/fs/nfsd/nfsctl.c
@@ -2259,6 +2259,7 @@ static __net_init int nfsd_net_init(struct net *net)
seqlock_init(&nn->writeverf_lock);
nfsd_proc_stat_init(net);
#if IS_ENABLED(CONFIG_NFS_LOCALIO)
+ spin_lock_init(&nn->local_clients_lock);
INIT_LIST_HEAD(&nn->local_clients);
#endif
return 0;
@@ -2283,7 +2284,8 @@ static __net_exit void nfsd_net_pre_exit(struct net *net)
{
struct nfsd_net *nn = net_generic(net, nfsd_net_id);
- nfs_localio_invalidate_clients(&nn->local_clients);
+ nfs_localio_invalidate_clients(&nn->local_clients,
+ &nn->local_clients_lock);
}
#endif
diff --git a/include/linux/nfslocalio.h b/include/linux/nfslocalio.h
index aa2b5c6561ab0..c68a529230c14 100644
--- a/include/linux/nfslocalio.h
+++ b/include/linux/nfslocalio.h
@@ -30,19 +30,23 @@ typedef struct {
/* sadly this struct is just over a cacheline, avoid bouncing */
spinlock_t ____cacheline_aligned lock;
struct list_head list;
+ spinlock_t *list_lock; /* nn->local_clients_lock */
struct net __rcu *net; /* nfsd's network namespace */
struct auth_domain *dom; /* auth_domain for localio */
+ /* Local files to close when net is shut down or exports change */
+ struct list_head files;
} nfs_uuid_t;
void nfs_uuid_init(nfs_uuid_t *);
bool nfs_uuid_begin(nfs_uuid_t *);
void nfs_uuid_end(nfs_uuid_t *);
-void nfs_uuid_is_local(const uuid_t *, struct list_head *,
+void nfs_uuid_is_local(const uuid_t *, struct list_head *, spinlock_t *,
struct net *, struct auth_domain *, struct module *);
void nfs_localio_enable_client(struct nfs_client *clp);
void nfs_localio_disable_client(struct nfs_client *clp);
-void nfs_localio_invalidate_clients(struct list_head *list);
+void nfs_localio_invalidate_clients(struct list_head *nn_local_clients,
+ spinlock_t *nn_local_clients_lock);
/* localio needs to map filehandle -> struct nfsd_file */
extern struct nfsd_file *
From 0dc73141524403f979a9655b4c55d763dbcb2b88 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Fri, 15 Nov 2024 20:41:03 -0500
Subject: [PATCH 14/28] nfs_common: add nfs_localio trace events
The nfs_localio.ko now exposes /sys/kernel/tracing/events/nfs_localio
with nfs_localio_enable_client and nfs_localio_disable_client events.
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs_common/Makefile | 3 +-
fs/nfs_common/localio_trace.c | 10 +++++++
fs/nfs_common/localio_trace.h | 56 +++++++++++++++++++++++++++++++++++
fs/nfs_common/nfslocalio.c | 4 +++
4 files changed, 72 insertions(+), 1 deletion(-)
create mode 100644 fs/nfs_common/localio_trace.c
create mode 100644 fs/nfs_common/localio_trace.h
diff --git a/fs/nfs_common/Makefile b/fs/nfs_common/Makefile
index a5e54809701e3..c10ead273ff2c 100644
--- a/fs/nfs_common/Makefile
+++ b/fs/nfs_common/Makefile
@@ -6,8 +6,9 @@
obj-$(CONFIG_NFS_ACL_SUPPORT) += nfs_acl.o
nfs_acl-objs := nfsacl.o
+CFLAGS_localio_trace.o += -I$(src)
obj-$(CONFIG_NFS_COMMON_LOCALIO_SUPPORT) += nfs_localio.o
-nfs_localio-objs := nfslocalio.o
+nfs_localio-objs := nfslocalio.o localio_trace.o
obj-$(CONFIG_GRACE_PERIOD) += grace.o
obj-$(CONFIG_NFS_V4_2_SSC_HELPER) += nfs_ssc.o
diff --git a/fs/nfs_common/localio_trace.c b/fs/nfs_common/localio_trace.c
new file mode 100644
index 0000000000000..7decfe57abebb
--- /dev/null
+++ b/fs/nfs_common/localio_trace.c
@@ -0,0 +1,10 @@
+// SPDX-License-Identifier: GPL-2.0
+/*
+ * Copyright (c) 2024 Trond Myklebust <trond.myklebust@hammerspace.com>
+ * Copyright (C) 2024 Mike Snitzer <snitzer@hammerspace.com>
+ */
+#include <linux/nfs_fs.h>
+#include <linux/namei.h>
+
+#define CREATE_TRACE_POINTS
+#include "localio_trace.h"
diff --git a/fs/nfs_common/localio_trace.h b/fs/nfs_common/localio_trace.h
new file mode 100644
index 0000000000000..4055aec9ff8dc
--- /dev/null
+++ b/fs/nfs_common/localio_trace.h
@@ -0,0 +1,56 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+/*
+ * Copyright (c) 2024 Trond Myklebust <trond.myklebust@hammerspace.com>
+ * Copyright (C) 2024 Mike Snitzer <snitzer@hammerspace.com>
+ */
+#undef TRACE_SYSTEM
+#define TRACE_SYSTEM nfs_localio
+
+#if !defined(_TRACE_NFS_COMMON_LOCALIO_H) || defined(TRACE_HEADER_MULTI_READ)
+#define _TRACE_NFS_COMMON_LOCALIO_H
+
+#include <linux/tracepoint.h>
+
+#include <trace/misc/fs.h>
+#include <trace/misc/nfs.h>
+#include <trace/misc/sunrpc.h>
+
+DECLARE_EVENT_CLASS(nfs_local_client_event,
+ TP_PROTO(
+ const struct nfs_client *clp
+ ),
+
+ TP_ARGS(clp),
+
+ TP_STRUCT__entry(
+ __field(unsigned int, protocol)
+ __string(server, clp->cl_hostname)
+ ),
+
+ TP_fast_assign(
+ __entry->protocol = clp->rpc_ops->version;
+ __assign_str(server);
+ ),
+
+ TP_printk(
+ "server=%s NFSv%u", __get_str(server), __entry->protocol
+ )
+);
+
+#define DEFINE_NFS_LOCAL_CLIENT_EVENT(name) \
+ DEFINE_EVENT(nfs_local_client_event, name, \
+ TP_PROTO( \
+ const struct nfs_client *clp \
+ ), \
+ TP_ARGS(clp))
+
+DEFINE_NFS_LOCAL_CLIENT_EVENT(nfs_localio_enable_client);
+DEFINE_NFS_LOCAL_CLIENT_EVENT(nfs_localio_disable_client);
+
+#endif /* _TRACE_NFS_COMMON_LOCALIO_H */
+
+#undef TRACE_INCLUDE_PATH
+#define TRACE_INCLUDE_PATH .
+#define TRACE_INCLUDE_FILE localio_trace
+/* This part must be outside protection */
+#include <trace/define_trace.h>
diff --git a/fs/nfs_common/nfslocalio.c b/fs/nfs_common/nfslocalio.c
index cfb61871fb1e0..0decc2fe154c8 100644
--- a/fs/nfs_common/nfslocalio.c
+++ b/fs/nfs_common/nfslocalio.c
@@ -12,6 +12,8 @@
#include <linux/nfs_fs.h>
#include <net/netns/generic.h>
+#include "localio_trace.h"
+
MODULE_LICENSE("GPL");
MODULE_DESCRIPTION("NFS localio protocol bypass support");
@@ -141,6 +143,7 @@ void nfs_localio_enable_client(struct nfs_client *clp)
spin_lock(&nfs_uuid->lock);
set_bit(NFS_CS_LOCAL_IO, &clp->cl_flags);
+ trace_nfs_localio_enable_client(clp);
spin_unlock(&nfs_uuid->lock);
}
EXPORT_SYMBOL_GPL(nfs_localio_enable_client);
@@ -199,6 +202,7 @@ void nfs_localio_disable_client(struct nfs_client *clp)
if (test_and_clear_bit(NFS_CS_LOCAL_IO, &clp->cl_flags)) {
/* &clp->cl_uuid is always not NULL, using as bool here */
nfs_uuid = &clp->cl_uuid;
+ trace_nfs_localio_disable_client(clp);
}
spin_unlock(&clp->cl_uuid.lock);
From 779a395189c692eec0246e7df63e2a3c0f0c8508 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Fri, 15 Nov 2024 20:41:04 -0500
Subject: [PATCH 15/28] nfs/localio: remove redundant code and simplify LOCALIO
enablement
Remove nfs_local_enable and nfs_local_disable, instead use
nfs_localio_enable_client and nfs_localio_disable_client.
Discontinue use of the NFS_CS_LOCAL_IO bit in the nfs_client struct's
cl_flags to reflect that LOCALIO is enabled; instead just test if the
net member of the nfs_uuid_t struct is set.
Also remove NFS_CS_LOCAL_IO.
Lastly, remove trace_nfs_local_enable and trace_nfs_local_disable
because comparable traces are available from nfs_localio.ko.
Suggested-by: NeilBrown <neilb@suse.de>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs/client.c | 4 ++--
fs/nfs/internal.h | 2 --
fs/nfs/localio.c | 28 +++++-----------------------
fs/nfs/nfstrace.h | 32 --------------------------------
fs/nfs_common/nfslocalio.c | 34 +++++++++++-----------------------
include/linux/nfs_fs_sb.h | 1 -
include/linux/nfslocalio.h | 4 ++++
7 files changed, 22 insertions(+), 83 deletions(-)
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index e83e1ce046130..16530c71fd152 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -38,7 +38,7 @@
#include <linux/sunrpc/bc_xprt.h>
#include <linux/nsproxy.h>
#include <linux/pid_namespace.h>
-
+#include <linux/nfslocalio.h>
#include "nfs4_fs.h"
#include "callback.h"
@@ -243,7 +243,7 @@ static void pnfs_init_server(struct nfs_server *server)
*/
void nfs_free_client(struct nfs_client *clp)
{
- nfs_local_disable(clp);
+ nfs_localio_disable_client(clp);
/* -EIO all pending I/O */
if (!IS_ERR(clp->cl_rpcclient))
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index febf289a9e4c4..aea8bcfb221bc 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -455,7 +455,6 @@ extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
#if IS_ENABLED(CONFIG_NFS_LOCALIO)
/* localio.c */
-extern void nfs_local_disable(struct nfs_client *);
extern void nfs_local_probe(struct nfs_client *);
extern struct nfsd_file *nfs_local_open_fh(struct nfs_client *,
const struct cred *,
@@ -472,7 +471,6 @@ extern int nfs_local_commit(struct nfsd_file *,
extern bool nfs_server_is_local(const struct nfs_client *clp);
#else /* CONFIG_NFS_LOCALIO */
-static inline void nfs_local_disable(struct nfs_client *clp) {}
static inline void nfs_local_probe(struct nfs_client *clp) {}
static inline struct nfsd_file *
nfs_local_open_fh(struct nfs_client *clp, const struct cred *cred,
diff --git a/fs/nfs/localio.c b/fs/nfs/localio.c
index 7e432057c3a1f..4b6bf4ea7d7fc 100644
--- a/fs/nfs/localio.c
+++ b/fs/nfs/localio.c
@@ -56,7 +56,7 @@ MODULE_PARM_DESC(localio_O_DIRECT_semantics,
static inline bool nfs_client_is_local(const struct nfs_client *clp)
{
- return !!test_bit(NFS_CS_LOCAL_IO, &clp->cl_flags);
+ return !!rcu_access_pointer(clp->cl_uuid.net);
}
bool nfs_server_is_local(const struct nfs_client *clp)
@@ -121,24 +121,6 @@ const struct rpc_program nfslocalio_program = {
.stats = &nfslocalio_rpcstat,
};
-/*
- * nfs_local_enable - enable local i/o for an nfs_client
- */
-static void nfs_local_enable(struct nfs_client *clp)
-{
- trace_nfs_local_enable(clp);
- nfs_localio_enable_client(clp);
-}
-
-/*
- * nfs_local_disable - disable local i/o for an nfs_client
- */
-void nfs_local_disable(struct nfs_client *clp)
-{
- trace_nfs_local_disable(clp);
- nfs_localio_disable_client(clp);
-}
-
/*
* nfs_init_localioclient - Initialise an NFS localio client connection
*/
@@ -194,19 +176,19 @@ void nfs_local_probe(struct nfs_client *clp)
/* Disallow localio if disabled via sysfs or AUTH_SYS isn't used */
if (!localio_enabled ||
clp->cl_rpcclient->cl_auth->au_flavor != RPC_AUTH_UNIX) {
- nfs_local_disable(clp);
+ nfs_localio_disable_client(clp);
return;
}
if (nfs_client_is_local(clp)) {
/* If already enabled, disable and re-enable */
- nfs_local_disable(clp);
+ nfs_localio_disable_client(clp);
}
if (!nfs_uuid_begin(&clp->cl_uuid))
return;
if (nfs_server_uuid_is_local(clp))
- nfs_local_enable(clp);
+ nfs_localio_enable_client(clp);
nfs_uuid_end(&clp->cl_uuid);
}
EXPORT_SYMBOL_GPL(nfs_local_probe);
@@ -748,7 +730,7 @@ int nfs_local_doio(struct nfs_client *clp, struct nfsd_file *localio,
if (status != 0) {
if (status == -EAGAIN)
- nfs_local_disable(clp);
+ nfs_localio_disable_client(clp);
nfs_local_file_put(localio);
hdr->task.tk_status = status;
nfs_local_hdr_release(hdr, call_ops);
diff --git a/fs/nfs/nfstrace.h b/fs/nfs/nfstrace.h
index 1eab98c277fab..7a058bd8c566e 100644
--- a/fs/nfs/nfstrace.h
+++ b/fs/nfs/nfstrace.h
@@ -1714,38 +1714,6 @@ TRACE_EVENT(nfs_local_open_fh,
)
);
-DECLARE_EVENT_CLASS(nfs_local_client_event,
- TP_PROTO(
- const struct nfs_client *clp
- ),
-
- TP_ARGS(clp),
-
- TP_STRUCT__entry(
- __field(unsigned int, protocol)
- __string(server, clp->cl_hostname)
- ),
-
- TP_fast_assign(
- __entry->protocol = clp->rpc_ops->version;
- __assign_str(server);
- ),
-
- TP_printk(
- "server=%s NFSv%u", __get_str(server), __entry->protocol
- )
-);
-
-#define DEFINE_NFS_LOCAL_CLIENT_EVENT(name) \
- DEFINE_EVENT(nfs_local_client_event, name, \
- TP_PROTO( \
- const struct nfs_client *clp \
- ), \
- TP_ARGS(clp))
-
-DEFINE_NFS_LOCAL_CLIENT_EVENT(nfs_local_enable);
-DEFINE_NFS_LOCAL_CLIENT_EVENT(nfs_local_disable);
-
DECLARE_EVENT_CLASS(nfs_xdr_event,
TP_PROTO(
const struct xdr_stream *xdr,
diff --git a/fs/nfs_common/nfslocalio.c b/fs/nfs_common/nfslocalio.c
index 0decc2fe154c8..bad7691e32b94 100644
--- a/fs/nfs_common/nfslocalio.c
+++ b/fs/nfs_common/nfslocalio.c
@@ -37,7 +37,7 @@ static LIST_HEAD(nfs_uuids);
void nfs_uuid_init(nfs_uuid_t *nfs_uuid)
{
- nfs_uuid->net = NULL;
+ RCU_INIT_POINTER(nfs_uuid->net, NULL);
nfs_uuid->dom = NULL;
nfs_uuid->list_lock = NULL;
INIT_LIST_HEAD(&nfs_uuid->list);
@@ -49,7 +49,7 @@ EXPORT_SYMBOL_GPL(nfs_uuid_init);
bool nfs_uuid_begin(nfs_uuid_t *nfs_uuid)
{
spin_lock(&nfs_uuid->lock);
- if (nfs_uuid->net) {
+ if (rcu_access_pointer(nfs_uuid->net)) {
/* This nfs_uuid is already in use */
spin_unlock(&nfs_uuid->lock);
return false;
@@ -74,9 +74,9 @@ EXPORT_SYMBOL_GPL(nfs_uuid_begin);
void nfs_uuid_end(nfs_uuid_t *nfs_uuid)
{
- if (nfs_uuid->net == NULL) {
+ if (!rcu_access_pointer(nfs_uuid->net)) {
spin_lock(&nfs_uuid->lock);
- if (nfs_uuid->net == NULL) {
+ if (!rcu_access_pointer(nfs_uuid->net)) {
/* Not local, remove from nfs_uuids */
spin_lock(&nfs_uuids_lock);
list_del_init(&nfs_uuid->list);
@@ -139,12 +139,8 @@ EXPORT_SYMBOL_GPL(nfs_uuid_is_local);
void nfs_localio_enable_client(struct nfs_client *clp)
{
- nfs_uuid_t *nfs_uuid = &clp->cl_uuid;
-
- spin_lock(&nfs_uuid->lock);
- set_bit(NFS_CS_LOCAL_IO, &clp->cl_flags);
+ /* nfs_uuid_is_local() does the actual enablement */
trace_nfs_localio_enable_client(clp);
- spin_unlock(&nfs_uuid->lock);
}
EXPORT_SYMBOL_GPL(nfs_localio_enable_client);
@@ -152,15 +148,15 @@ EXPORT_SYMBOL_GPL(nfs_localio_enable_client);
* Cleanup the nfs_uuid_t embedded in an nfs_client.
* This is the long-form of nfs_uuid_init().
*/
-static void nfs_uuid_put(nfs_uuid_t *nfs_uuid)
+static bool nfs_uuid_put(nfs_uuid_t *nfs_uuid)
{
LIST_HEAD(local_files);
struct nfs_file_localio *nfl, *tmp;
spin_lock(&nfs_uuid->lock);
- if (unlikely(!nfs_uuid->net)) {
+ if (unlikely(!rcu_access_pointer(nfs_uuid->net))) {
spin_unlock(&nfs_uuid->lock);
- return;
+ return false;
}
RCU_INIT_POINTER(nfs_uuid->net, NULL);
@@ -192,22 +188,14 @@ static void nfs_uuid_put(nfs_uuid_t *nfs_uuid)
module_put(nfsd_mod);
spin_unlock(&nfs_uuid->lock);
+
+ return true;
}
void nfs_localio_disable_client(struct nfs_client *clp)
{
- nfs_uuid_t *nfs_uuid = NULL;
-
- spin_lock(&clp->cl_uuid.lock); /* aka &nfs_uuid->lock */
- if (test_and_clear_bit(NFS_CS_LOCAL_IO, &clp->cl_flags)) {
- /* &clp->cl_uuid is always not NULL, using as bool here */
- nfs_uuid = &clp->cl_uuid;
+ if (nfs_uuid_put(&clp->cl_uuid))
trace_nfs_localio_disable_client(clp);
- }
- spin_unlock(&clp->cl_uuid.lock);
-
- if (nfs_uuid)
- nfs_uuid_put(nfs_uuid);
}
EXPORT_SYMBOL_GPL(nfs_localio_disable_client);
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index 239d86ef166c0..ed66df1093e89 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -50,7 +50,6 @@ struct nfs_client {
#define NFS_CS_DS 7 /* - Server is a DS */
#define NFS_CS_REUSEPORT 8 /* - reuse src port on reconnect */
#define NFS_CS_PNFS 9 /* - Server used for pnfs */
-#define NFS_CS_LOCAL_IO 10 /* - client is local */
struct sockaddr_storage cl_addr; /* server identifier */
size_t cl_addrlen;
char * cl_hostname; /* hostname of server */
diff --git a/include/linux/nfslocalio.h b/include/linux/nfslocalio.h
index c68a529230c14..05817d6ef3d1e 100644
--- a/include/linux/nfslocalio.h
+++ b/include/linux/nfslocalio.h
@@ -111,6 +111,10 @@ static inline void nfs_close_local_fh(struct nfs_file_localio *nfl)
static inline void nfsd_localio_ops_init(void)
{
}
+struct nfs_client;
+static inline void nfs_localio_disable_client(struct nfs_client *clp)
+{
+}
#endif /* CONFIG_NFS_LOCALIO */
From 76d4cb6345da0f2cd505e552157258325bcc8bcd Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Fri, 15 Nov 2024 20:41:05 -0500
Subject: [PATCH 16/28] nfs: probe for LOCALIO when v4 client reconnects to
server
Introduce nfs_local_probe_async() for the NFS client to initiate
if/when it reconnects with server. For NFSv4 it is a simple matter to
call nfs_local_probe_async() from nfs4_do_reclaim (during NFSv4
grace).
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs/client.c | 1 +
fs/nfs/internal.h | 3 +++
fs/nfs/localio.c | 14 ++++++++++++++
fs/nfs/nfs4state.c | 1 +
include/linux/nfs_fs_sb.h | 1 +
5 files changed, 20 insertions(+)
diff --git a/fs/nfs/client.c b/fs/nfs/client.c
index 16530c71fd152..3b0918ade53cd 100644
--- a/fs/nfs/client.c
+++ b/fs/nfs/client.c
@@ -186,6 +186,7 @@ struct nfs_client *nfs_alloc_client(const struct nfs_client_initdata *cl_init)
seqlock_init(&clp->cl_boot_lock);
ktime_get_real_ts64(&clp->cl_nfssvc_boot);
nfs_uuid_init(&clp->cl_uuid);
+ INIT_WORK(&clp->cl_local_probe_work, nfs_local_probe_async_work);
#endif /* CONFIG_NFS_LOCALIO */
clp->cl_principal = "*";
diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h
index aea8bcfb221bc..fae2c7ae4acc2 100644
--- a/fs/nfs/internal.h
+++ b/fs/nfs/internal.h
@@ -456,6 +456,8 @@ extern int nfs_wait_bit_killable(struct wait_bit_key *key, int mode);
#if IS_ENABLED(CONFIG_NFS_LOCALIO)
/* localio.c */
extern void nfs_local_probe(struct nfs_client *);
+extern void nfs_local_probe_async(struct nfs_client *);
+extern void nfs_local_probe_async_work(struct work_struct *);
extern struct nfsd_file *nfs_local_open_fh(struct nfs_client *,
const struct cred *,
struct nfs_fh *,
@@ -472,6 +474,7 @@ extern bool nfs_server_is_local(const struct nfs_client *clp);
#else /* CONFIG_NFS_LOCALIO */
static inline void nfs_local_probe(struct nfs_client *clp) {}
+static inline void nfs_local_probe_async(struct nfs_client *clp) {}
static inline struct nfsd_file *
nfs_local_open_fh(struct nfs_client *clp, const struct cred *cred,
struct nfs_fh *fh, struct nfs_file_localio *nfl,
diff --git a/fs/nfs/localio.c b/fs/nfs/localio.c
index 4b6bf4ea7d7fc..1eee5aac28843 100644
--- a/fs/nfs/localio.c
+++ b/fs/nfs/localio.c
@@ -193,6 +193,20 @@ void nfs_local_probe(struct nfs_client *clp)
}
EXPORT_SYMBOL_GPL(nfs_local_probe);
+void nfs_local_probe_async_work(struct work_struct *work)
+{
+ struct nfs_client *clp =
+ container_of(work, struct nfs_client, cl_local_probe_work);
+
+ nfs_local_probe(clp);
+}
+
+void nfs_local_probe_async(struct nfs_client *clp)
+{
+ queue_work(nfsiod_workqueue, &clp->cl_local_probe_work);
+}
+EXPORT_SYMBOL_GPL(nfs_local_probe_async);
+
static inline struct nfsd_file *nfs_local_file_get(struct nfsd_file *nf)
{
return nfs_to->nfsd_file_get(nf);
diff --git a/fs/nfs/nfs4state.c b/fs/nfs/nfs4state.c
index 9a9f60a2291b4..542cdf71229fe 100644
--- a/fs/nfs/nfs4state.c
+++ b/fs/nfs/nfs4state.c
@@ -1955,6 +1955,7 @@ static int nfs4_do_reclaim(struct nfs_client *clp, const struct nfs4_state_recov
}
rcu_read_unlock();
nfs4_free_state_owners(&freeme);
+ nfs_local_probe_async(clp);
if (lost_locks)
pr_warn("NFS: %s: lost %d locks\n",
clp->cl_hostname, lost_locks);
diff --git a/include/linux/nfs_fs_sb.h b/include/linux/nfs_fs_sb.h
index ed66df1093e89..f00bfcee7120e 100644
--- a/include/linux/nfs_fs_sb.h
+++ b/include/linux/nfs_fs_sb.h
@@ -131,6 +131,7 @@ struct nfs_client {
struct timespec64 cl_nfssvc_boot;
seqlock_t cl_boot_lock;
nfs_uuid_t cl_uuid;
+ struct work_struct cl_local_probe_work;
#endif /* CONFIG_NFS_LOCALIO */
};
From 4a489220aa8c9daf5f02396c28cebade9f9ab563 Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Fri, 15 Nov 2024 20:41:06 -0500
Subject: [PATCH 17/28] nfs: probe for LOCALIO when v3 client reconnects to
server
Re-enabling NFSv3 LOCALIO is made more complex (than NFSv4) because v3
is stateless. As such, the hueristic used to identify a LOCALIO probe
point is more adhoc by nature: if/when NFSv3 client IO begins to
complete again in terms of normal RPC-based NFSv3 server IO, attempt
nfs_local_probe_async().
Care is taken to throttle the frequency of nfs_local_probe_async(),
otherwise there could be a flood of repeat calls to
nfs_local_probe_async().
The throttle is admin controlled using a new module parameter for
nfsv3, e.g.:
echo 512 > /sys/module/nfsv3/parameters/nfs3_localio_probe_throttle
Probe for NFSv3 LOCALIO every N IO requests (512 in this case). Must
be power-of-2, defaults to 0 (probing disabled).
On systems that expect to use LOCALIO with NFSv3 the admin should
configure the 'nfs3_localio_probe_throttle' module parameter.
This commit backfills module parameter documentation in localio.rst
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
Documentation/filesystems/nfs/localio.rst | 20 +++++++++-
fs/nfs/nfs3proc.c | 46 +++++++++++++++++++++--
fs/nfs_common/nfslocalio.c | 1 +
include/linux/nfslocalio.h | 3 +-
4 files changed, 65 insertions(+), 5 deletions(-)
diff --git a/Documentation/filesystems/nfs/localio.rst b/Documentation/filesystems/nfs/localio.rst
index 7d2dbf75e96db..79808b37d7457 100644
--- a/Documentation/filesystems/nfs/localio.rst
+++ b/Documentation/filesystems/nfs/localio.rst
@@ -291,7 +291,7 @@ align their IO).
Security
========
-Localio is only supported when UNIX-style authentication (AUTH_UNIX, aka
+LOCALIO is only supported when UNIX-style authentication (AUTH_UNIX, aka
AUTH_SYS) is used.
Care is taken to ensure the same NFS security mechanisms are used
@@ -306,6 +306,24 @@ client is afforded this same level of access (albeit in terms of the NFS
protocol via SUNRPC). No other namespaces (user, mount, etc) have been
altered or purposely extended from the server to the client.
+Module Parameters
+=================
+
+/sys/module/nfs/parameters/localio_enabled (bool)
+controls if LOCALIO is enabled, defaults to Y. If client and server are
+local but 'localio_enabled' is set to N then LOCALIO will not be used.
+
+/sys/module/nfs/parameters/localio_O_DIRECT_semantics (bool)
+controls if O_DIRECT extends down to the underlying filesystem, defaults
+to N. Application IO must be logical blocksize aligned, otherwise
+O_DIRECT will fail.
+
+/sys/module/nfsv3/parameters/nfs3_localio_probe_throttle (uint)
+controls if NFSv3 read and write IOs will trigger (re)enabling of
+LOCALIO every N (nfs3_localio_probe_throttle) IOs, defaults to 0
+(disabled). Must be power-of-2, admin keeps all the pieces if they
+misconfigure (too low a value or non-power-of-2).
+
Testing
=======
diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index 1566163c6d85b..7359e1a3bd84c 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -844,6 +844,41 @@ nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
return status;
}
+#if IS_ENABLED(CONFIG_NFS_LOCALIO)
+
+static unsigned nfs3_localio_probe_throttle __read_mostly = 0;
+module_param(nfs3_localio_probe_throttle, uint, 0644);
+MODULE_PARM_DESC(nfs3_localio_probe_throttle,
+ "Probe for NFSv3 LOCALIO every N IO requests. Must be power-of-2, defaults to 0 (probing disabled).");
+
+static void nfs3_localio_probe(struct nfs_server *server)
+{
+ struct nfs_client *clp = server->nfs_client;
+
+ /* Throttled to reduce nfs_local_probe_async() frequency */
+ if (!nfs3_localio_probe_throttle || nfs_server_is_local(clp))
+ return;
+
+ /*
+ * Try (re)enabling LOCALIO if isn't enabled -- admin deems
+ * it worthwhile to periodically check if LOCALIO possible by
+ * setting the 'nfs3_localio_probe_throttle' module parameter.
+ *
+ * This is useful if LOCALIO was previously enabled, but was
+ * disabled due to server restart, and IO has successfully
+ * completed in terms of normal RPC.
+ */
+ if ((clp->cl_uuid.nfs3_localio_probe_count++ &
+ (nfs3_localio_probe_throttle - 1)) == 0) {
+ if (!nfs_server_is_local(clp))
+ nfs_local_probe_async(clp);
+ }
+}
+
+#else
+static void nfs3_localio_probe(struct nfs_server *server) {}
+#endif
+
static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
{
struct inode *inode = hdr->inode;
@@ -855,8 +890,11 @@ static int nfs3_read_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
if (nfs3_async_handle_jukebox(task, inode))
return -EAGAIN;
- if (task->tk_status >= 0 && !server->read_hdrsize)
- cmpxchg(&server->read_hdrsize, 0, hdr->res.replen);
+ if (task->tk_status >= 0) {
+ if (!server->read_hdrsize)
+ cmpxchg(&server->read_hdrsize, 0, hdr->res.replen);
+ nfs3_localio_probe(server);
+ }
nfs_invalidate_atime(inode);
nfs_refresh_inode(inode, &hdr->fattr);
@@ -886,8 +924,10 @@ static int nfs3_write_done(struct rpc_task *task, struct nfs_pgio_header *hdr)
if (nfs3_async_handle_jukebox(task, inode))
return -EAGAIN;
- if (task->tk_status >= 0)
+ if (task->tk_status >= 0) {
nfs_writeback_update_inode(hdr);
+ nfs3_localio_probe(NFS_SERVER(inode));
+ }
return 0;
}
diff --git a/fs/nfs_common/nfslocalio.c b/fs/nfs_common/nfslocalio.c
index bad7691e32b94..6a0bdea6d6449 100644
--- a/fs/nfs_common/nfslocalio.c
+++ b/fs/nfs_common/nfslocalio.c
@@ -43,6 +43,7 @@ void nfs_uuid_init(nfs_uuid_t *nfs_uuid)
INIT_LIST_HEAD(&nfs_uuid->list);
INIT_LIST_HEAD(&nfs_uuid->files);
spin_lock_init(&nfs_uuid->lock);
+ nfs_uuid->nfs3_localio_probe_count = 0;
}
EXPORT_SYMBOL_GPL(nfs_uuid_init);
diff --git a/include/linux/nfslocalio.h b/include/linux/nfslocalio.h
index 05817d6ef3d1e..9aa8a43843d71 100644
--- a/include/linux/nfslocalio.h
+++ b/include/linux/nfslocalio.h
@@ -27,7 +27,8 @@ struct nfs_file_localio;
*/
typedef struct {
uuid_t uuid;
- /* sadly this struct is just over a cacheline, avoid bouncing */
+ unsigned nfs3_localio_probe_count;
+ /* this struct is over a cacheline, avoid bouncing */
spinlock_t ____cacheline_aligned lock;
struct list_head list;
spinlock_t *list_lock; /* nn->local_clients_lock */
From ead11ac50ad4b8ef1b64806e962ea984862d96ad Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Mon, 13 Jan 2025 17:29:03 -0500
Subject: [PATCH 18/28] nfs: fix incorrect error handling in LOCALIO
nfs4_stat_to_errno() expects a NFSv4 error code as an argument and
returns a POSIX errno.
The problem is LOCALIO is passing nfs4_stat_to_errno() the POSIX errno
return values from filp->f_op->read_iter(), filp->f_op->write_iter()
and vfs_fsync_range().
So the POSIX errno that nfs_local_pgio_done() and
nfs_local_commit_done() are passing to nfs4_stat_to_errno() are
failing to match any NFSv4 error code, which results in
nfs4_stat_to_errno() defaulting to returning -EREMOTEIO. This causes
assertions in upper layers due to -EREMOTEIO not being a valid NFSv4
error code.
Fix this by updating nfs_local_pgio_done() and nfs_local_commit_done()
to use the new nfs_localio_errno_to_nfs4_stat() to map a POSIX errno
to an NFSv4 error code.
Care was taken to factor out nfs4_errtbl_common[] to avoid duplicating
the same NFS error to errno table. nfs4_errtbl_common[] is checked
first by both nfs4_stat_to_errno and nfs_localio_errno_to_nfs4_stat
before they check their own more specialized tables (nfs4_errtbl[] and
nfs4_errtbl_localio[] respectively).
While auditing the associated error mapping tables, the (ab)use of -1
for the last table entry was removed in favor of using ARRAY_SIZE to
iterate the nfs_errtbl[] and nfs4_errtbl[]. And 'errno_NFSERR_IO' was
removed because it caused needless obfuscation.
Fixes: 70ba381e1a431 ("nfs: add LOCALIO support")
Reported-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs/localio.c | 4 +-
fs/nfs_common/common.c | 89 +++++++++++++++++++++++++++++++++-----
include/linux/nfs_common.h | 3 +-
3 files changed, 82 insertions(+), 14 deletions(-)
diff --git a/fs/nfs/localio.c b/fs/nfs/localio.c
index 1eee5aac28843..5c21caeae075c 100644
--- a/fs/nfs/localio.c
+++ b/fs/nfs/localio.c
@@ -388,7 +388,7 @@ nfs_local_pgio_done(struct nfs_pgio_header *hdr, long status)
hdr->res.op_status = NFS4_OK;
hdr->task.tk_status = 0;
} else {
- hdr->res.op_status = nfs4_stat_to_errno(status);
+ hdr->res.op_status = nfs_localio_errno_to_nfs4_stat(status);
hdr->task.tk_status = status;
}
}
@@ -786,7 +786,7 @@ nfs_local_commit_done(struct nfs_commit_data *data, int status)
data->task.tk_status = 0;
} else {
nfs_reset_boot_verifier(data->inode);
- data->res.op_status = nfs4_stat_to_errno(status);
+ data->res.op_status = nfs_localio_errno_to_nfs4_stat(status);
data->task.tk_status = status;
}
}
diff --git a/fs/nfs_common/common.c b/fs/nfs_common/common.c
index 34a115176f97e..af09aed09fd27 100644
--- a/fs/nfs_common/common.c
+++ b/fs/nfs_common/common.c
@@ -15,7 +15,7 @@ static const struct {
{ NFS_OK, 0 },
{ NFSERR_PERM, -EPERM },
{ NFSERR_NOENT, -ENOENT },
- { NFSERR_IO, -errno_NFSERR_IO},
+ { NFSERR_IO, -EIO },
{ NFSERR_NXIO, -ENXIO },
/* { NFSERR_EAGAIN, -EAGAIN }, */
{ NFSERR_ACCES, -EACCES },
@@ -45,7 +45,6 @@ static const struct {
{ NFSERR_SERVERFAULT, -EREMOTEIO },
{ NFSERR_BADTYPE, -EBADTYPE },
{ NFSERR_JUKEBOX, -EJUKEBOX },
- { -1, -EIO }
};
/**
@@ -59,26 +58,29 @@ int nfs_stat_to_errno(enum nfs_stat status)
{
int i;
- for (i = 0; nfs_errtbl[i].stat != -1; i++) {
+ for (i = 0; i < ARRAY_SIZE(nfs_errtbl); i++) {
if (nfs_errtbl[i].stat == (int)status)
return nfs_errtbl[i].errno;
}
- return nfs_errtbl[i].errno;
+ return -EIO;
}
EXPORT_SYMBOL_GPL(nfs_stat_to_errno);
/*
* We need to translate between nfs v4 status return values and
* the local errno values which may not be the same.
+ *
+ * nfs4_errtbl_common[] is used before more specialized mappings
+ * available in nfs4_errtbl[] or nfs4_errtbl_localio[].
*/
static const struct {
int stat;
int errno;
-} nfs4_errtbl[] = {
+} nfs4_errtbl_common[] = {
{ NFS4_OK, 0 },
{ NFS4ERR_PERM, -EPERM },
{ NFS4ERR_NOENT, -ENOENT },
- { NFS4ERR_IO, -errno_NFSERR_IO},
+ { NFS4ERR_IO, -EIO },
{ NFS4ERR_NXIO, -ENXIO },
{ NFS4ERR_ACCESS, -EACCES },
{ NFS4ERR_EXIST, -EEXIST },
@@ -98,15 +100,20 @@ static const struct {
{ NFS4ERR_BAD_COOKIE, -EBADCOOKIE },
{ NFS4ERR_NOTSUPP, -ENOTSUPP },
{ NFS4ERR_TOOSMALL, -ETOOSMALL },
- { NFS4ERR_SERVERFAULT, -EREMOTEIO },
{ NFS4ERR_BADTYPE, -EBADTYPE },
- { NFS4ERR_LOCKED, -EAGAIN },
{ NFS4ERR_SYMLINK, -ELOOP },
- { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP },
{ NFS4ERR_DEADLOCK, -EDEADLK },
+};
+
+static const struct {
+ int stat;
+ int errno;
+} nfs4_errtbl[] = {
+ { NFS4ERR_SERVERFAULT, -EREMOTEIO },
+ { NFS4ERR_LOCKED, -EAGAIN },
+ { NFS4ERR_OP_ILLEGAL, -EOPNOTSUPP },
{ NFS4ERR_NOXATTR, -ENODATA },
{ NFS4ERR_XATTR2BIG, -E2BIG },
- { -1, -EIO }
};
/*
@@ -116,7 +123,14 @@ static const struct {
int nfs4_stat_to_errno(int stat)
{
int i;
- for (i = 0; nfs4_errtbl[i].stat != -1; i++) {
+
+ /* First check nfs4_errtbl_common */
+ for (i = 0; i < ARRAY_SIZE(nfs4_errtbl_common); i++) {
+ if (nfs4_errtbl_common[i].stat == stat)
+ return nfs4_errtbl_common[i].errno;
+ }
+ /* Then check nfs4_errtbl */
+ for (i = 0; i < ARRAY_SIZE(nfs4_errtbl); i++) {
if (nfs4_errtbl[i].stat == stat)
return nfs4_errtbl[i].errno;
}
@@ -132,3 +146,56 @@ int nfs4_stat_to_errno(int stat)
return -stat;
}
EXPORT_SYMBOL_GPL(nfs4_stat_to_errno);
+
+/*
+ * This table is useful for conversion from local errno to NFS error.
+ * It provides more logically correct mappings for use with LOCALIO
+ * (which is focused on converting from errno to NFS status).
+ */
+static const struct {
+ int stat;
+ int errno;
+} nfs4_errtbl_localio[] = {
+ /* Map errors differently than nfs4_errtbl */
+ { NFS4ERR_IO, -EREMOTEIO },
+ { NFS4ERR_DELAY, -EAGAIN },
+ { NFS4ERR_FBIG, -E2BIG },
+ /* Map errors not handled by nfs4_errtbl */
+ { NFS4ERR_STALE, -EBADF },
+ { NFS4ERR_STALE, -EOPENSTALE },
+ { NFS4ERR_DELAY, -ETIMEDOUT },
+ { NFS4ERR_DELAY, -ERESTARTSYS },
+ { NFS4ERR_DELAY, -ENOMEM },
+ { NFS4ERR_IO, -ETXTBSY },
+ { NFS4ERR_IO, -EBUSY },
+ { NFS4ERR_SERVERFAULT, -ESERVERFAULT },
+ { NFS4ERR_SERVERFAULT, -ENFILE },
+ { NFS4ERR_IO, -EUCLEAN },
+ { NFS4ERR_PERM, -ENOKEY },
+};
+
+/*
+ * Convert an errno to an NFS error code for LOCALIO.
+ */
+__u32 nfs_localio_errno_to_nfs4_stat(int errno)
+{
+ int i;
+
+ /* First check nfs4_errtbl_common */
+ for (i = 0; i < ARRAY_SIZE(nfs4_errtbl_common); i++) {
+ if (nfs4_errtbl_common[i].errno == errno)
+ return nfs4_errtbl_common[i].stat;
+ }
+ /* Then check nfs4_errtbl_localio */
+ for (i = 0; i < ARRAY_SIZE(nfs4_errtbl_localio); i++) {
+ if (nfs4_errtbl_localio[i].errno == errno)
+ return nfs4_errtbl_localio[i].stat;
+ }
+ /* If we cannot translate the error, the recovery routines should
+ * handle it.
+ * Note: remaining NFSv4 error codes have values > 10000, so should
+ * not conflict with native Linux error codes.
+ */
+ return NFS4ERR_SERVERFAULT;
+}
+EXPORT_SYMBOL_GPL(nfs_localio_errno_to_nfs4_stat);
diff --git a/include/linux/nfs_common.h b/include/linux/nfs_common.h
index 5fc02df882521..a541c3a028875 100644
--- a/include/linux/nfs_common.h
+++ b/include/linux/nfs_common.h
@@ -9,9 +9,10 @@
#include <uapi/linux/nfs.h>
/* Mapping from NFS error code to "errno" error code. */
-#define errno_NFSERR_IO EIO
int nfs_stat_to_errno(enum nfs_stat status);
int nfs4_stat_to_errno(int stat);
+__u32 nfs_localio_errno_to_nfs4_stat(int errno);
+
#endif /* _LINUX_NFS_COMMON_H */
From 90190ba1c3b11687e2c251fda1f5d9893b4bab17 Mon Sep 17 00:00:00 2001
From: Dragan Simic <dsimic@manjaro.org>
Date: Fri, 27 Dec 2024 20:17:58 +0100
Subject: [PATCH 19/28] nfs: Make NFS_FSCACHE select NETFS_SUPPORT instead of
depending on it
Having the NFS_FSCACHE option depend on the NETFS_SUPPORT options makes
selecting NFS_FSCACHE impossible unless another option that additionally
selects NETFS_SUPPORT is already selected.
As a result, for example, being able to reach and select the NFS_FSCACHE
option requires the CEPH_FS or CIFS option to be selected beforehand, which
obviously doesn't make much sense.
Let's correct this by making the NFS_FSCACHE option actually select the
NETFS_SUPPORT option, instead of depending on it.
Fixes: 915cd30cdea8 ("netfs, fscache: Combine fscache with netfs")
Cc: stable@vger.kernel.org
Reported-by: Diederik de Haas <didi.debian@cknow.org>
Signed-off-by: Dragan Simic <dsimic@manjaro.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs/Kconfig | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/fs/nfs/Kconfig b/fs/nfs/Kconfig
index 0eb20012792f0..d3f76101ad4b9 100644
--- a/fs/nfs/Kconfig
+++ b/fs/nfs/Kconfig
@@ -170,7 +170,8 @@ config ROOT_NFS
config NFS_FSCACHE
bool "Provide NFS client caching support"
- depends on NFS_FS=m && NETFS_SUPPORT || NFS_FS=y && NETFS_SUPPORT=y
+ depends on NFS_FS
+ select NETFS_SUPPORT
select FSCACHE
help
Say Y here if you want NFS data to be cached locally on disc through
From d2fc83c5df63f1391006ff7f734bfb794c76badd Mon Sep 17 00:00:00 2001
From: Chuck Lever <chuck.lever@oracle.com>
Date: Mon, 13 Jan 2025 10:32:36 -0500
Subject: [PATCH 20/28] NFS: CB_OFFLOAD can return NFS4ERR_DELAY
RFC 7862 permits the callback service to respond to a CB_OFFLOAD
operation with NFS4ERR_DELAY. Use that instead of
NFS4ERR_SERVERFAULT for temporary memory allocation failure, as that
is more consistent with how other operations report memory
allocation failure.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs/callback_proc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/nfs/callback_proc.c b/fs/nfs/callback_proc.c
index 7832fb0369a12..8397c43358bd1 100644
--- a/fs/nfs/callback_proc.c
+++ b/fs/nfs/callback_proc.c
@@ -718,7 +718,7 @@ __be32 nfs4_callback_offload(void *data, void *dummy,
copy = kzalloc(sizeof(struct nfs4_copy_state), GFP_KERNEL);
if (!copy)
- return htonl(NFS4ERR_SERVERFAULT);
+ return cpu_to_be32(NFS4ERR_DELAY);
spin_lock(&cps->clp->cl_lock);
rcu_read_lock();
From 36f4e9ef84bb334392628bcc21557ddad7dc8e5f Mon Sep 17 00:00:00 2001
From: Chuck Lever <chuck.lever@oracle.com>
Date: Mon, 13 Jan 2025 10:32:37 -0500
Subject: [PATCH 21/28] NFS: Fix typo in OFFLOAD_CANCEL comment
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs/nfs42xdr.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/nfs/nfs42xdr.c b/fs/nfs/nfs42xdr.c
index 9e3ae53e22058..ef5730c5e704f 100644
--- a/fs/nfs/nfs42xdr.c
+++ b/fs/nfs/nfs42xdr.c
@@ -549,7 +549,7 @@ static void nfs4_xdr_enc_copy(struct rpc_rqst *req,
}
/*
- * Encode OFFLOAD_CANEL request
+ * Encode OFFLOAD_CANCEL request
*/
static void nfs4_xdr_enc_offload_cancel(struct rpc_rqst *req,
struct xdr_stream *xdr,
From aa9e4ad0fd87f44748af84616accbd42cfb875aa Mon Sep 17 00:00:00 2001
From: Chuck Lever <chuck.lever@oracle.com>
Date: Mon, 13 Jan 2025 10:32:38 -0500
Subject: [PATCH 22/28] NFS: Rename struct nfs4_offloadcancel_data
Refactor: This struct can be used unchanged for the new
OFFLOAD_STATUS implementation, so give it a more generic name.
Reviewed-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Reviewed-by: Benjamin Coddington <bcodding@redhat.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs/nfs42proc.c | 18 +++++++++---------
1 file changed, 9 insertions(+), 9 deletions(-)
diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index 531c9c20ef1d1..9d716907cf304 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -498,15 +498,15 @@ ssize_t nfs42_proc_copy(struct file *src, loff_t pos_src,
return err;
}
-struct nfs42_offloadcancel_data {
+struct nfs42_offload_data {
struct nfs_server *seq_server;
struct nfs42_offload_status_args args;
struct nfs42_offload_status_res res;
};
-static void nfs42_offload_cancel_prepare(struct rpc_task *task, void *calldata)
+static void nfs42_offload_prepare(struct rpc_task *task, void *calldata)
{
- struct nfs42_offloadcancel_data *data = calldata;
+ struct nfs42_offload_data *data = calldata;
nfs4_setup_sequence(data->seq_server->nfs_client,
&data->args.osa_seq_args,
@@ -515,7 +515,7 @@ static void nfs42_offload_cancel_prepare(struct rpc_task *task, void *calldata)
static void nfs42_offload_cancel_done(struct rpc_task *task, void *calldata)
{
- struct nfs42_offloadcancel_data *data = calldata;
+ struct nfs42_offload_data *data = calldata;
trace_nfs4_offload_cancel(&data->args, task->tk_status);
nfs41_sequence_done(task, &data->res.osr_seq_res);
@@ -525,22 +525,22 @@ static void nfs42_offload_cancel_done(struct rpc_task *task, void *calldata)
rpc_restart_call_prepare(task);
}
-static void nfs42_free_offloadcancel_data(void *data)
+static void nfs42_offload_release(void *data)
{
kfree(data);
}
static const struct rpc_call_ops nfs42_offload_cancel_ops = {
- .rpc_call_prepare = nfs42_offload_cancel_prepare,
+ .rpc_call_prepare = nfs42_offload_prepare,
.rpc_call_done = nfs42_offload_cancel_done,
- .rpc_release = nfs42_free_offloadcancel_data,
+ .rpc_release = nfs42_offload_release,
};
static int nfs42_do_offload_cancel_async(struct file *dst,
nfs4_stateid *stateid)
{
struct nfs_server *dst_server = NFS_SERVER(file_inode(dst));
- struct nfs42_offloadcancel_data *data = NULL;
+ struct nfs42_offload_data *data = NULL;
struct nfs_open_context *ctx = nfs_file_open_context(dst);
struct rpc_task *task;
struct rpc_message msg = {
@@ -559,7 +559,7 @@ static int nfs42_do_offload_cancel_async(struct file *dst,
if (!(dst_server->caps & NFS_CAP_OFFLOAD_CANCEL))
return -EOPNOTSUPP;
- data = kzalloc(sizeof(struct nfs42_offloadcancel_data), GFP_KERNEL);
+ data = kzalloc(sizeof(struct nfs42_offload_data), GFP_KERNEL);
if (data == NULL)
return -ENOMEM;
From e8380c2d06055665b3df6c03964911375d7f9290 Mon Sep 17 00:00:00 2001
From: Olga Kornievskaia <okorniev@redhat.com>
Date: Fri, 13 Dec 2024 11:52:00 -0500
Subject: [PATCH 23/28] NFSv4.2: fix COPY_NOTIFY xdr buf size calculation
We need to include sequence size in the compound.
Fixes: 0491567b51ef ("NFS: add COPY_NOTIFY operation")
Signed-off-by: Olga Kornievskaia <okorniev@redhat.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs/nfs42xdr.c | 2 ++
1 file changed, 2 insertions(+)
diff --git a/fs/nfs/nfs42xdr.c b/fs/nfs/nfs42xdr.c
index ef5730c5e704f..5072d7ea72e9e 100644
--- a/fs/nfs/nfs42xdr.c
+++ b/fs/nfs/nfs42xdr.c
@@ -144,9 +144,11 @@
decode_putfh_maxsz + \
decode_offload_cancel_maxsz)
#define NFS4_enc_copy_notify_sz (compound_encode_hdr_maxsz + \
+ encode_sequence_maxsz + \
encode_putfh_maxsz + \
encode_copy_notify_maxsz)
#define NFS4_dec_copy_notify_sz (compound_decode_hdr_maxsz + \
+ decode_sequence_maxsz + \
decode_putfh_maxsz + \
decode_copy_notify_maxsz)
#define NFS4_enc_deallocate_sz (compound_encode_hdr_maxsz + \
From 668135b9348c53fd205f5e07d11e82b10f31b55b Mon Sep 17 00:00:00 2001
From: Olga Kornievskaia <okorniev@redhat.com>
Date: Fri, 13 Dec 2024 11:52:01 -0500
Subject: [PATCH 24/28] NFSv4.2: mark OFFLOAD_CANCEL MOVEABLE
OFFLOAD_CANCEL should be marked MOVEABLE for when we need to move
tasks off a non-functional transport.
Fixes: c975c2092657 ("NFS send OFFLOAD_CANCEL when COPY killed")
Signed-off-by: Olga Kornievskaia <okorniev@redhat.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs/nfs42proc.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index 9d716907cf304..f01a42965254f 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -552,7 +552,7 @@ static int nfs42_do_offload_cancel_async(struct file *dst,
.rpc_message = &msg,
.callback_ops = &nfs42_offload_cancel_ops,
.workqueue = nfsiod_workqueue,
- .flags = RPC_TASK_ASYNC,
+ .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
};
int status;
From 0b96c75d86560c077d29ce629e9d1ca0258c9cc1 Mon Sep 17 00:00:00 2001
From: Olga Kornievskaia <okorniev@redhat.com>
Date: Fri, 13 Dec 2024 11:52:02 -0500
Subject: [PATCH 25/28] NFSv4.2: make LAYOUTSTATS and LAYOUTERROR MOVEABLE
LAYOUTSTATS and LAYOUTERROR should be marked MOVEABLE for when we
need to move tasks off a non-functional transport.
Signed-off-by: Olga Kornievskaia <okorniev@redhat.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs/nfs42proc.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/fs/nfs/nfs42proc.c b/fs/nfs/nfs42proc.c
index f01a42965254f..1924c4a2077b1 100644
--- a/fs/nfs/nfs42proc.c
+++ b/fs/nfs/nfs42proc.c
@@ -861,7 +861,7 @@ int nfs42_proc_layoutstats_generic(struct nfs_server *server,
.rpc_message = &msg,
.callback_ops = &nfs42_layoutstat_ops,
.callback_data = data,
- .flags = RPC_TASK_ASYNC,
+ .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
};
struct rpc_task *task;
@@ -1016,7 +1016,7 @@ int nfs42_proc_layouterror(struct pnfs_layout_segment *lseg,
struct rpc_task_setup task_setup = {
.rpc_message = &msg,
.callback_ops = &nfs42_layouterror_ops,
- .flags = RPC_TASK_ASYNC,
+ .flags = RPC_TASK_ASYNC | RPC_TASK_MOVEABLE,
};
unsigned int i;
From eb3fabde15bccdf34f1c9b35a83aa4c0dacbb4ca Mon Sep 17 00:00:00 2001
From: Mike Snitzer <snitzer@kernel.org>
Date: Thu, 16 Jan 2025 20:05:39 -0500
Subject: [PATCH 26/28] pnfs/flexfiles: retry getting layout segment for reads
If ff_layout_pg_get_read()'s attempt to get a layout segment results
in -EAGAIN have ff_layout_pg_init_read() retry it after sleeping.
If "softerr" mount is used, use 'io_maxretrans' to limit the number of
attempts to get a layout segment.
This fixes a long-standing issue of O_DIRECT reads failing with
-EAGAIN (11) when using flexfiles Client Side Mirroring (CSM).
Cc: stable@vger.kernel.org
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
fs/nfs/flexfilelayout/flexfilelayout.c | 27 ++++++++++++++++++++------
1 file changed, 21 insertions(+), 6 deletions(-)
diff --git a/fs/nfs/flexfilelayout/flexfilelayout.c b/fs/nfs/flexfilelayout/flexfilelayout.c
index ce61bf1ada6c3..98b45b636be33 100644
--- a/fs/nfs/flexfilelayout/flexfilelayout.c
+++ b/fs/nfs/flexfilelayout/flexfilelayout.c
@@ -848,6 +848,9 @@ ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
struct nfs4_pnfs_ds *ds;
u32 ds_idx;
+ if (NFS_SERVER(pgio->pg_inode)->flags &
+ (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
+ pgio->pg_maxretrans = io_maxretrans;
retry:
pnfs_generic_pg_check_layout(pgio, req);
/* Use full layout for now */
@@ -861,6 +864,8 @@ ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
if (!pgio->pg_lseg)
goto out_nolseg;
}
+ /* Reset wb_nio, since getting layout segment was successful */
+ req->wb_nio = 0;
ds = ff_layout_get_ds_for_read(pgio, &ds_idx);
if (!ds) {
@@ -877,14 +882,24 @@ ff_layout_pg_init_read(struct nfs_pageio_descriptor *pgio,
pgm->pg_bsize = mirror->mirror_ds->ds_versions[0].rsize;
pgio->pg_mirror_idx = ds_idx;
-
- if (NFS_SERVER(pgio->pg_inode)->flags &
- (NFS_MOUNT_SOFT|NFS_MOUNT_SOFTERR))
- pgio->pg_maxretrans = io_maxretrans;
return;
out_nolseg:
- if (pgio->pg_error < 0)
- return;
+ if (pgio->pg_error < 0) {
+ if (pgio->pg_error != -EAGAIN)
+ return;
+ /* Retry getting layout segment if lower layer returned -EAGAIN */
+ if (pgio->pg_maxretrans && req->wb_nio++ > pgio->pg_maxretrans) {
+ if (NFS_SERVER(pgio->pg_inode)->flags & NFS_MOUNT_SOFTERR)
+ pgio->pg_error = -ETIMEDOUT;
+ else
+ pgio->pg_error = -EIO;
+ return;
+ }
+ pgio->pg_error = 0;
+ /* Sleep for 1 second before retrying */
+ ssleep(1);
+ goto retry;
+ }
out_mds:
trace_pnfs_mds_fallback_pg_init_read(pgio->pg_inode,
0, NFS4_MAX_UINT64, IOMODE_READ,
From 918b8e3b3ffda3602a0179b7b9b904f89561c03e Mon Sep 17 00:00:00 2001
From: Jeff Layton <jlayton@kernel.org>
Date: Wed, 22 Jan 2025 10:18:12 -0500
Subject: [PATCH 27/28] sunrpc: add netns inum and srcaddr to debugfs rpc_xprt
info
The output format should provide a value that matches the one in
the /proc/<pid>/ns/net symlink. This makes it simpler to match the
rpc_xprt and rpc_clnt to a particular container.
Also, when the xprt defines the get_srcaddr operation, use that to
display the source address as well.
Signed-off-by: Jeff Layton <jlayton@kernel.org>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
net/sunrpc/debugfs.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/net/sunrpc/debugfs.c b/net/sunrpc/debugfs.c
index e4a4c547c70c1..32417db340de3 100644
--- a/net/sunrpc/debugfs.c
+++ b/net/sunrpc/debugfs.c
@@ -182,6 +182,18 @@ xprt_info_show(struct seq_file *f, void *v)
seq_printf(f, "addr: %s\n", xprt->address_strings[RPC_DISPLAY_ADDR]);
seq_printf(f, "port: %s\n", xprt->address_strings[RPC_DISPLAY_PORT]);
seq_printf(f, "state: 0x%lx\n", xprt->state);
+ seq_printf(f, "netns: %u\n", xprt->xprt_net->ns.inum);
+
+ if (xprt->ops->get_srcaddr) {
+ int ret, buflen;
+ char buf[INET6_ADDRSTRLEN];
+
+ buflen = ARRAY_SIZE(buf);
+ ret = xprt->ops->get_srcaddr(xprt, buf, buflen);
+ if (ret < 0)
+ ret = sprintf(buf, "<closed>");
+ seq_printf(f, "saddr: %.*s\n", ret, buf);
+ }
return 0;
}
From 6f56971841a178e99c502f4150fa28b9d699ed31 Mon Sep 17 00:00:00 2001
From: Dai Ngo <dai.ngo@oracle.com>
Date: Wed, 8 Jan 2025 12:48:12 -0800
Subject: [PATCH 28/28] SUNRPC: do not retry on EKEYEXPIRED when user TGT
ticket expired
When a user TGT ticket expired, gssd returns EKEYEXPIRED to the RPC
layer for the upcall to create the security context. The RPC layer
then retries the upcall twice before returning the EKEYEXPIRED to
the NFS layer.
This results in three separate TCP connections to the NFS server being
created by gssd for each RPC request. These connections are not used
and left in TIME_WAIT state.
Note that for RPC call that uses machine credential, gssd automatically
renews the ticket. But for a regular user the ticket needs to be
renewed by the user before access to the krb5 share is allowed.
This patch removes the retries by RPC on EKEYEXPIRED so that these
unused TCP connections are not created.
Reproducer:
$ kinit -l 1m
$ sleep 65
$ cd /mnt/krb5share
$ netstat -na |grep TIME_WAIT
Signed-off-by: Dai Ngo <dai.ngo@oracle.com>
Signed-off-by: Anna Schumaker <anna.schumaker@oracle.com>
---
net/sunrpc/clnt.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/net/sunrpc/clnt.c b/net/sunrpc/clnt.c
index 79956948ae9d0..2fe88ea79a70c 100644
--- a/net/sunrpc/clnt.c
+++ b/net/sunrpc/clnt.c
@@ -1862,13 +1862,13 @@ call_refreshresult(struct rpc_task *task)
fallthrough;
case -EAGAIN:
status = -EACCES;
- fallthrough;
- case -EKEYEXPIRED:
if (!task->tk_cred_retry)
break;
task->tk_cred_retry--;
trace_rpc_retry_refresh_status(task);
return;
+ case -EKEYEXPIRED:
+ break;
case -ENOMEM:
rpc_delay(task, HZ >> 4);
return;