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Merge branch 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs

Browse Source 
Pull vfs mount infrastructure updates from Al Viro:
 "The rest of core infrastructure; no new syscalls in that pile, but the
  old parts are switched to new infrastructure. At that point
  conversions of individual filesystems can happen independently; some
  are done here (afs, cgroup, procfs, etc.), there's also a large series
  outside of that pile dealing with NFS (quite a bit of option-parsing
  stuff is getting used there - it's one of the most convoluted
  filesystems in terms of mount-related logics), but NFS bits are the
  next cycle fodder.

  It got seriously simplified since the last cycle; documentation is
  probably the weakest bit at the moment - I considered dropping the
  commit introducing Documentation/filesystems/mount_api.txt (cutting
  the size increase by quarter ;-), but decided that it would be better
  to fix it up after -rc1 instead.

  That pile allows to do followup work in independent branches, which
  should make life much easier for the next cycle. fs/super.c size
  increase is unpleasant; there's a followup series that allows to
  shrink it considerably, but I decided to leave that until the next
  cycle"

* 'work.mount' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs: (41 commits)
  afs: Use fs_context to pass parameters over automount
  afs: Add fs_context support
  vfs: Add some logging to the core users of the fs_context log
  vfs: Implement logging through fs_context
  vfs: Provide documentation for new mount API
  vfs: Remove kern_mount_data()
  hugetlbfs: Convert to fs_context
  cpuset: Use fs_context
  kernfs, sysfs, cgroup, intel_rdt: Support fs_context
  cgroup: store a reference to cgroup_ns into cgroup_fs_context
  cgroup1_get_tree(): separate "get cgroup_root to use" into a separate helper
  cgroup_do_mount(): massage calling conventions
  cgroup: stash cgroup_root reference into cgroup_fs_context
  cgroup2: switch to option-by-option parsing
  cgroup1: switch to option-by-option parsing
  cgroup: take options parsing into ->parse_monolithic()
  cgroup: fold cgroup1_mount() into cgroup1_get_tree()
  cgroup: start switching to fs_context
  ipc: Convert mqueue fs to fs_context
  proc: Add fs_context support to procfs
  ...
This commit is contained in:
Linus Torvalds
2019-03-12 14:08:19 -07:00
parent dbc2fba3fc c99c2171fc
commit 7b47a9e7c8
45 changed files with 4377 additions and 1352 deletions
Download Patch File Download Diff File Expand all files Collapse all files

16
arch/x86/kernel/cpu/resctrl/internal.h
View File

@@ -4,6 +4,7 @@
#include <linux/sched.h>
#include <linux/kernfs.h>
#include <linux/fs_context.h>
#include <linux/jump_label.h>
#define MSR_IA32_L3_QOS_CFG 0xc81
@@ -40,6 +41,21 @@
#define RMID_VAL_ERROR BIT_ULL(63)
#define RMID_VAL_UNAVAIL BIT_ULL(62)
struct rdt_fs_context {
struct kernfs_fs_context kfc;
bool enable_cdpl2;
bool enable_cdpl3;
bool enable_mba_mbps;
};
static inline struct rdt_fs_context *rdt_fc2context(struct fs_context *fc)
{
struct kernfs_fs_context *kfc = fc->fs_private;
return container_of(kfc, struct rdt_fs_context, kfc);
}
DECLARE_STATIC_KEY_FALSE(rdt_enable_key);
/**

185
arch/x86/kernel/cpu/resctrl/rdtgroup.c
View File

@@ -24,6 +24,7 @@
#include <linux/cpu.h>
#include <linux/debugfs.h>
#include <linux/fs.h>
#include <linux/fs_parser.h>
#include <linux/sysfs.h>
#include <linux/kernfs.h>
#include <linux/seq_buf.h>
@@ -32,6 +33,7 @@
#include <linux/sched/task.h>
#include <linux/slab.h>
#include <linux/task_work.h>
#include <linux/user_namespace.h>
#include <uapi/linux/magic.h>
@@ -1858,46 +1860,6 @@ static void cdp_disable_all(void)
cdpl2_disable();
}
static int parse_rdtgroupfs_options(char *data)
{
char *token, *o = data;
int ret = 0;
while ((token = strsep(&o, ",")) != NULL) {
if (!*token) {
ret = -EINVAL;
goto out;
}
if (!strcmp(token, "cdp")) {
ret = cdpl3_enable();
if (ret)
goto out;
} else if (!strcmp(token, "cdpl2")) {
ret = cdpl2_enable();
if (ret)
goto out;
} else if (!strcmp(token, "mba_MBps")) {
if (boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
ret = set_mba_sc(true);
else
ret = -EINVAL;
if (ret)
goto out;
} else {
ret = -EINVAL;
goto out;
}
}
return 0;
out:
pr_err("Invalid mount option \"%s\"\n", token);
return ret;
}
/*
* We don't allow rdtgroup directories to be created anywhere
* except the root directory. Thus when looking for the rdtgroup
@@ -1969,13 +1931,27 @@ static int mkdir_mondata_all(struct kernfs_node *parent_kn,
struct rdtgroup *prgrp,
struct kernfs_node **mon_data_kn);
static struct dentry *rdt_mount(struct file_system_type *fs_type,
int flags, const char *unused_dev_name,
void *data)
static int rdt_enable_ctx(struct rdt_fs_context *ctx)
{
int ret = 0;
if (ctx->enable_cdpl2)
ret = cdpl2_enable();
if (!ret && ctx->enable_cdpl3)
ret = cdpl3_enable();
if (!ret && ctx->enable_mba_mbps)
ret = set_mba_sc(true);
return ret;
}
static int rdt_get_tree(struct fs_context *fc)
{
struct rdt_fs_context *ctx = rdt_fc2context(fc);
struct rdt_domain *dom;
struct rdt_resource *r;
struct dentry *dentry;
int ret;
cpus_read_lock();
@@ -1984,53 +1960,42 @@ static struct dentry *rdt_mount(struct file_system_type *fs_type,
* resctrl file system can only be mounted once.
*/
if (static_branch_unlikely(&rdt_enable_key)) {
dentry = ERR_PTR(-EBUSY);
ret = -EBUSY;
goto out;
}
ret = parse_rdtgroupfs_options(data);
if (ret) {
dentry = ERR_PTR(ret);
ret = rdt_enable_ctx(ctx);
if (ret < 0)
goto out_cdp;
}
closid_init();
ret = rdtgroup_create_info_dir(rdtgroup_default.kn);
if (ret) {
dentry = ERR_PTR(ret);
goto out_cdp;
}
if (ret < 0)
goto out_mba;
if (rdt_mon_capable) {
ret = mongroup_create_dir(rdtgroup_default.kn,
NULL, "mon_groups",
&kn_mongrp);
if (ret) {
dentry = ERR_PTR(ret);
if (ret < 0)
goto out_info;
}
kernfs_get(kn_mongrp);
ret = mkdir_mondata_all(rdtgroup_default.kn,
&rdtgroup_default, &kn_mondata);
if (ret) {
dentry = ERR_PTR(ret);
if (ret < 0)
goto out_mongrp;
}
kernfs_get(kn_mondata);
rdtgroup_default.mon.mon_data_kn = kn_mondata;
}
ret = rdt_pseudo_lock_init();
if (ret) {
dentry = ERR_PTR(ret);
if (ret)
goto out_mondata;
}
dentry = kernfs_mount(fs_type, flags, rdt_root,
RDTGROUP_SUPER_MAGIC, NULL);
if (IS_ERR(dentry))
ret = kernfs_get_tree(fc);
if (ret < 0)
goto out_psl;
if (rdt_alloc_capable)
@@ -2059,14 +2024,95 @@ out_mongrp:
kernfs_remove(kn_mongrp);
out_info:
kernfs_remove(kn_info);
out_mba:
if (ctx->enable_mba_mbps)
set_mba_sc(false);
out_cdp:
cdp_disable_all();
out:
rdt_last_cmd_clear();
mutex_unlock(&rdtgroup_mutex);
cpus_read_unlock();
return ret;
}
return dentry;
enum rdt_param {
Opt_cdp,
Opt_cdpl2,
Opt_mba_mpbs,
nr__rdt_params
};
static const struct fs_parameter_spec rdt_param_specs[] = {
fsparam_flag("cdp", Opt_cdp),
fsparam_flag("cdpl2", Opt_cdpl2),
fsparam_flag("mba_mpbs", Opt_mba_mpbs),
{}
};
static const struct fs_parameter_description rdt_fs_parameters = {
.name = "rdt",
.specs = rdt_param_specs,
};
static int rdt_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
struct rdt_fs_context *ctx = rdt_fc2context(fc);
struct fs_parse_result result;
int opt;
opt = fs_parse(fc, &rdt_fs_parameters, param, &result);
if (opt < 0)
return opt;
switch (opt) {
case Opt_cdp:
ctx->enable_cdpl3 = true;
return 0;
case Opt_cdpl2:
ctx->enable_cdpl2 = true;
return 0;
case Opt_mba_mpbs:
if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
return -EINVAL;
ctx->enable_mba_mbps = true;
return 0;
}
return -EINVAL;
}
static void rdt_fs_context_free(struct fs_context *fc)
{
struct rdt_fs_context *ctx = rdt_fc2context(fc);
kernfs_free_fs_context(fc);
kfree(ctx);
}
static const struct fs_context_operations rdt_fs_context_ops = {
.free = rdt_fs_context_free,
.parse_param = rdt_parse_param,
.get_tree = rdt_get_tree,
};
static int rdt_init_fs_context(struct fs_context *fc)
{
struct rdt_fs_context *ctx;
ctx = kzalloc(sizeof(struct rdt_fs_context), GFP_KERNEL);
if (!ctx)
return -ENOMEM;
ctx->kfc.root = rdt_root;
ctx->kfc.magic = RDTGROUP_SUPER_MAGIC;
fc->fs_private = &ctx->kfc;
fc->ops = &rdt_fs_context_ops;
if (fc->user_ns)
put_user_ns(fc->user_ns);
fc->user_ns = get_user_ns(&init_user_ns);
fc->global = true;
return 0;
}
static int reset_all_ctrls(struct rdt_resource *r)
@@ -2239,9 +2285,10 @@ static void rdt_kill_sb(struct super_block *sb)
}
static struct file_system_type rdt_fs_type = {
.name = "resctrl",
.mount = rdt_mount,
.kill_sb = rdt_kill_sb,
.name = "resctrl",
.init_fs_context = rdt_init_fs_context,
.parameters = &rdt_fs_parameters,
.kill_sb = rdt_kill_sb,
};
static int mon_addfile(struct kernfs_node *parent_kn, const char *name,