File 0020-LU-14195-lustre-remove-fs-from-struct-lvfs_run_ctxt.patch of Package lustre_2_12

From 19aa3db0b39fabc09e12d03fad2c6b4bc27947fa Mon Sep 17 00:00:00 2001
From: Mr NeilBrown <neilb@suse.de>
Date: Wed, 9 Dec 2020 13:11:18 +1100
Subject: [PATCH 20/35] LU-14195 lustre: remove 'fs' from 'struct
 lvfs_run_ctxt'

The code protected by push_ctxt() and pop_ctx() never tries to access
any user-space data, so call set_fs() to KERNEL_DS is not needed.

So remove the 'fs' field and related code.

In linux-5.10 this code fails to compile as set_fs() is deprecated.

Test-Parameters: trivial
Signed-off-by: Mr NeilBrown <neilb@suse.de>
Change-Id: Idb2744d656dc4228375b6da54673e38cc1c112f5
Reviewed-on: https://review.whamcloud.com/40910
Tested-by: jenkins <devops@whamcloud.com>
Tested-by: Maloo <maloo@whamcloud.com>
Reviewed-by: Andreas Dilger <adilger@whamcloud.com>
Reviewed-by: James Simmons <jsimmons@infradead.org>
Reviewed-by: Alex Zhuravlev <bzzz@whamcloud.com>
Reviewed-by: Oleg Drokin <green@whamcloud.com>
---
 lustre/include/lvfs.h           | 1 -
 lustre/osd-ldiskfs/osd_compat.c | 1 -
 lustre/osd-ldiskfs/osd_scrub.c  | 1 -
 lustre/ptlrpc/sec_ctx.c         | 3 ---
 4 files changed, 6 deletions(-)

diff --git a/lustre/include/lvfs.h b/lustre/include/lvfs.h
index 856ee1972aa0..f24aff819f66 100644
--- a/lustre/include/lvfs.h
+++ b/lustre/include/lvfs.h
@@ -52,7 +52,6 @@ struct dt_device;
 struct lvfs_run_ctxt {
 	struct vfsmount		*pwdmnt;
 	struct dentry		*pwd;
-	mm_segment_t		 fs;
 	int			 umask;
 	struct dt_device	*dt;
 #ifdef OBD_CTXT_DEBUG
diff --git a/lustre/osd-ldiskfs/osd_compat.c b/lustre/osd-ldiskfs/osd_compat.c
index 1374f90bd3c1..f39e39a48968 100644
--- a/lustre/osd-ldiskfs/osd_compat.c
+++ b/lustre/osd-ldiskfs/osd_compat.c
@@ -59,7 +59,6 @@ static void osd_push_ctxt(const struct osd_device *dev,
 	OBD_SET_CTXT_MAGIC(newctxt);
 	newctxt->pwdmnt = dev->od_mnt;
 	newctxt->pwd = dev->od_mnt->mnt_root;
-	newctxt->fs = get_ds();
 	newctxt->umask = current_umask();
 	newctxt->dt = NULL;
 
diff --git a/lustre/osd-ldiskfs/osd_scrub.c b/lustre/osd-ldiskfs/osd_scrub.c
index 9e193ee79853..9f0e123fc48f 100644
--- a/lustre/osd-ldiskfs/osd_scrub.c
+++ b/lustre/osd-ldiskfs/osd_scrub.c
@@ -2598,7 +2598,6 @@ int osd_scrub_setup(const struct lu_env *env, struct osd_device *dev,
 	OBD_SET_CTXT_MAGIC(ctxt);
 	ctxt->pwdmnt = dev->od_mnt;
 	ctxt->pwd = dev->od_mnt->mnt_root;
-	ctxt->fs = get_ds();
 
 	init_waitqueue_head(&scrub->os_thread.t_ctl_waitq);
 	init_rwsem(&scrub->os_rwsem);
diff --git a/lustre/ptlrpc/sec_ctx.c b/lustre/ptlrpc/sec_ctx.c
index 5667495752b6..0b3422be584f 100644
--- a/lustre/ptlrpc/sec_ctx.c
+++ b/lustre/ptlrpc/sec_ctx.c
@@ -57,7 +57,6 @@ void push_ctxt(struct lvfs_run_ctxt *save, struct lvfs_run_ctxt *new_ctx)
 	ASSERT_CTXT_MAGIC(new_ctx->magic);
 	OBD_SET_CTXT_MAGIC(save);
 
-	save->fs = get_fs();
 	LASSERT(ll_d_count(current->fs->pwd.dentry));
 	LASSERT(ll_d_count(new_ctx->pwd));
 	save->pwd = dget(current->fs->pwd.dentry);
@@ -70,7 +69,6 @@ void push_ctxt(struct lvfs_run_ctxt *save, struct lvfs_run_ctxt *new_ctx)
 	LASSERT(new_ctx->pwdmnt);
 
 	current->fs->umask = 0; /* umask already applied on client */
-	set_fs(new_ctx->fs);
 	ll_set_fs_pwd(current->fs, new_ctx->pwdmnt, new_ctx->pwd);
 }
 EXPORT_SYMBOL(push_ctxt);
@@ -89,7 +87,6 @@ void pop_ctxt(struct lvfs_run_ctxt *saved, struct lvfs_run_ctxt *new_ctx)
 	LASSERTF(current->fs->pwd.mnt == new_ctx->pwdmnt, "%p != %p\n",
 		 current->fs->pwd.mnt, new_ctx->pwdmnt);
 
-	set_fs(saved->fs);
 	ll_set_fs_pwd(current->fs, saved->pwdmnt, saved->pwd);
 
 	dput(saved->pwd);
-- 
2.41.0