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fs: move namespace sysctls and declare fs base directory

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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@kernel.org
Signed-off-by: Luis Chamberlain <mcgrof@kernel.org>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Cc: Anil S Keshavamurthy <anil.s.keshavamurthy@intel.com>
Cc: Antti Palosaari <crope@iki.fi>
Cc: Christian Brauner <christian.brauner@ubuntu.com>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: Eric Biederman <ebiederm@xmission.com>
Cc: Eric Biggers <ebiggers@google.com>
Cc: Iurii Zaikin <yzaikin@google.com>
Cc: Kees Cook <keescook@chromium.org>
Cc: Lukas Middendorf <kernel@tuxforce.de>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: "Naveen N. Rao" <naveen.n.rao@linux.ibm.com>
Cc: Stephen Kitt <steve@sk2.org>
Cc: Xiaoming Ni <nixiaoming@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Luis Chamberlain 2022-01-21 22:13:27 -08:00 committed by Linus Torvalds
parent 51cb8dfc5a
commit ab171b952c
5 changed files with 30 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

3
fs/Makefile
View File

@ -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

24
fs/namespace.c
View File

@ -37,7 +37,7 @@
#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;
@ -4620,3 +4620,25 @@ const struct proc_ns_operations mntns_operations = {
.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 */

9
fs/sysctls.c
View File

@ -29,10 +29,11 @@ static struct ctl_table fs_shared_sysctls[] = {
{ }
};
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);

3
include/linux/mount.h
View File

@ -113,9 +113,6 @@ extern void mnt_set_expiry(struct vfsmount *mnt, struct list_head *expiry_list);
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);

14
kernel/sysctl.c
View File

@ -2811,18 +2811,6 @@ 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
{
@ -2853,7 +2841,6 @@ 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);
@ -2861,7 +2848,6 @@ 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);