The patch titled
Subject: fs: move namespace sysctls and declare fs base directory
has been added to the -mm tree. Its filename is
fs-move-namespace-sysctls-and-declare-fs-base-directory.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/fs-move-namespace-sysctls-and-declare-fs-base-directory.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/fs-move-namespace-sysctls-and-declare-fs-base-directory.patch
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------------------------------------------------------
From: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Subject: fs: move namespace sysctls and declare fs base directory
This moves the namespace sysctls to its own file as part of the
kernel/sysctl.c spring cleaning
Since we have now removed all sysctls for "fs", we now have to declare it
on the filesystem code, we do that using the new helper, which reduces
boiler plate code.
We rename init_fs_shared_sysctls() to init_fs_sysctls() to reflect that
now fs/sysctls.c is taking on the burden of being the first to register
the base directory as well.
Lastly, since init code will load in the order in which we link it we have
to move the sysctl code to be linked in early, so that its early init
routine runs prior to other fs code. This way, other filesystem code can
register their own sysctls using the helpers after this:
* register_sysctl_init()
* register_sysctl()
Link: https://lkml.kernel.org/r/20211129211943.640266-3-mcgrof@xxxxxxxxxx
Signed-off-by: Luis Chamberlain <mcgrof@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@xxxxxxxxx>
Cc: Antti Palosaari <crope@xxxxxx>
Cc: Christian Brauner <christian.brauner@xxxxxxxxxx>
Cc: "David S. Miller" <davem@xxxxxxxxxxxxx>
Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Eric Biggers <ebiggers@xxxxxxxxxx>
Cc: Iurii Zaikin <yzaikin@xxxxxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Lukas Middendorf <kernel@xxxxxxxxxxx>
Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
Cc: Mauro Carvalho Chehab <mchehab@xxxxxxxxxx>
Cc: "Naveen N. Rao" <naveen.n.rao@xxxxxxxxxxxxx>
Cc: Stephen Kitt <steve@xxxxxxx>
Cc: Xiaoming Ni <nixiaoming@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/Makefile | 3 ++-
fs/namespace.c | 24 +++++++++++++++++++++++-
fs/sysctls.c | 9 +++++----
include/linux/mount.h | 3 ---
kernel/sysctl.c | 14 --------------
5 files changed, 30 insertions(+), 23 deletions(-)
--- a/fs/Makefile~fs-move-namespace-sysctls-and-declare-fs-base-directory
+++ a/fs/Makefile
@@ -6,6 +6,8 @@
# Rewritten to use lists instead of if-statements.
#
+obj-$(CONFIG_SYSCTL) += sysctls.o
+
obj-y := open.o read_write.o file_table.o super.o \
char_dev.o stat.o exec.o pipe.o namei.o fcntl.o \
ioctl.o readdir.o select.o dcache.o inode.o \
@@ -28,7 +30,6 @@ obj-y += notify/
obj-$(CONFIG_EPOLL) += eventpoll.o
obj-y += anon_inodes.o
obj-$(CONFIG_SIGNALFD) += signalfd.o
-obj-$(CONFIG_SYSCTL) += sysctls.o
obj-$(CONFIG_TIMERFD) += timerfd.o
obj-$(CONFIG_EVENTFD) += eventfd.o
obj-$(CONFIG_USERFAULTFD) += userfaultfd.o
--- a/fs/namespace.c~fs-move-namespace-sysctls-and-declare-fs-base-directory
+++ a/fs/namespace.c
@@ -36,7 +36,7 @@
#include "internal.h"
/* Maximum number of mounts in a mount namespace */
-unsigned int sysctl_mount_max __read_mostly = 100000;
+static unsigned int sysctl_mount_max __read_mostly = 100000;
static unsigned int m_hash_mask __read_mostly;
static unsigned int m_hash_shift __read_mostly;
@@ -4612,3 +4612,25 @@ const struct proc_ns_operations mntns_op
.install = mntns_install,
.owner = mntns_owner,
};
+
+#ifdef CONFIG_SYSCTL
+static struct ctl_table fs_namespace_sysctls[] = {
+ {
+ .procname = "mount-max",
+ .data = &sysctl_mount_max,
+ .maxlen = sizeof(unsigned int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = SYSCTL_ONE,
+ },
+ { }
+};
+
+static int __init init_fs_namespace_sysctls(void)
+{
+ register_sysctl_init("fs", fs_namespace_sysctls);
+ return 0;
+}
+fs_initcall(init_fs_namespace_sysctls);
+
+#endif /* CONFIG_SYSCTL */
--- a/fs/sysctls.c~fs-move-namespace-sysctls-and-declare-fs-base-directory
+++ a/fs/sysctls.c
@@ -29,10 +29,11 @@ static struct ctl_table fs_shared_sysctl
{ }
};
-static int __init init_fs_shared_sysctls(void)
+DECLARE_SYSCTL_BASE(fs, fs_shared_sysctls);
+
+static int __init init_fs_sysctls(void)
{
- register_sysctl_init("fs", fs_shared_sysctls);
- return 0;
+ return register_sysctl_base(fs);
}
-early_initcall(init_fs_shared_sysctls);
+early_initcall(init_fs_sysctls);
--- a/include/linux/mount.h~fs-move-namespace-sysctls-and-declare-fs-base-directory
+++ a/include/linux/mount.h
@@ -113,9 +113,6 @@ extern void mnt_set_expiry(struct vfsmou
extern void mark_mounts_for_expiry(struct list_head *mounts);
extern dev_t name_to_dev_t(const char *name);
-
-extern unsigned int sysctl_mount_max;
-
extern bool path_is_mountpoint(const struct path *path);
extern void kern_unmount_array(struct vfsmount *mnt[], unsigned int num);
--- a/kernel/sysctl.c~fs-move-namespace-sysctls-and-declare-fs-base-directory
+++ a/kernel/sysctl.c
@@ -2810,18 +2810,6 @@ static struct ctl_table vm_table[] = {
{ }
};
-static struct ctl_table fs_table[] = {
- {
- .procname = "mount-max",
- .data = &sysctl_mount_max,
- .maxlen = sizeof(unsigned int),
- .mode = 0644,
- .proc_handler = proc_dointvec_minmax,
- .extra1 = SYSCTL_ONE,
- },
- { }
-};
-
static struct ctl_table debug_table[] = {
#ifdef CONFIG_SYSCTL_EXCEPTION_TRACE
{
@@ -2852,7 +2840,6 @@ static struct ctl_table dev_table[] = {
DECLARE_SYSCTL_BASE(kernel, kern_table);
DECLARE_SYSCTL_BASE(vm, vm_table);
-DECLARE_SYSCTL_BASE(fs, fs_table);
DECLARE_SYSCTL_BASE(debug, debug_table);
DECLARE_SYSCTL_BASE(dev, dev_table);
@@ -2860,7 +2847,6 @@ int __init sysctl_init(void)
{
register_sysctl_base(kernel);
register_sysctl_base(vm);
- register_sysctl_base(fs);
register_sysctl_base(debug);
register_sysctl_base(dev);
_
Patches currently in -mm which might be from mcgrof@xxxxxxxxxx are
zram-use-attribute_groups.patch
hpet-simplify-subdirectory-registration-with-register_sysctl.patch
i915-simplify-subdirectory-registration-with-register_sysctl.patch
macintosh-mac_hidc-simplify-subdirectory-registration-with-register_sysctl.patch
ocfs2-simplify-subdirectory-registration-with-register_sysctl.patch
test_sysctl-simplify-subdirectory-registration-with-register_sysctl.patch
inotify-simplify-subdirectory-registration-with-register_sysctl-fix.patch
cdrom-simplify-subdirectory-registration-with-register_sysctl.patch
sysctl-add-helper-to-register-a-sysctl-mount-point.patch
fs-move-binfmt_misc-sysctl-to-its-own-file.patch
sysctl-share-unsigned-long-const-values.patch
fs-move-inode-sysctls-to-its-own-file.patch
fs-move-fs-stat-sysctls-to-file_tablec.patch
fs-move-dcache-sysctls-to-its-own-file.patch
sysctl-move-maxolduid-as-a-sysctl-specific-const.patch
fs-move-shared-sysctls-to-fs-sysctlsc.patch
fs-move-locking-sysctls-where-they-are-used.patch
fs-move-namei-sysctls-to-its-own-file.patch
fs-move-fs-execc-sysctls-into-its-own-file.patch
fs-move-pipe-sysctls-to-is-own-file.patch
sysctl-add-and-use-base-directory-declarer-and-registration-helper.patch
fs-move-namespace-sysctls-and-declare-fs-base-directory.patch
kernel-sysctlc-rename-sysctl_init-to-sysctl_init_bases.patch
