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Subject[PATCH 02/13] vfs: move vfs_parse_sb_flag() calls into filesystems
Date
Move parsing "standard" options into filesystems' ->parse_param().  This
patch doesn't change behavior.

This is in preparation for allowing filesystems to reject options that they
don't support.

Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
---
arch/x86/kernel/cpu/resctrl/rdtgroup.c | 6 +++++-
fs/afs/super.c | 6 +++++-
fs/fs_context.c | 12 +++++++-----
fs/fuse/control.c | 1 +
fs/hugetlbfs/inode.c | 6 +++++-
fs/proc/root.c | 6 +++++-
fs/sysfs/mount.c | 1 +
include/linux/fs_context.h | 1 +
ipc/mqueue.c | 1 +
kernel/cgroup/cgroup-v1.c | 6 +++++-
kernel/cgroup/cgroup.c | 6 +++++-
kernel/cgroup/cpuset.c | 1 +
12 files changed, 42 insertions(+), 11 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 2131b8bbaad7..83d3c358f95e 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2051,7 +2051,11 @@ 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;
+ int ret, opt;
+
+ ret = vfs_parse_sb_flag(fc, param);
+ if (ret != -ENOPARAM)
+ return ret;

opt = fs_parse(fc, &rdt_fs_parameters, param, &result);
if (opt < 0)
diff --git a/fs/afs/super.c b/fs/afs/super.c
index f18911e8d770..7f032d08781b 100644
--- a/fs/afs/super.c
+++ b/fs/afs/super.c
@@ -321,7 +321,11 @@ static int afs_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
struct fs_parse_result result;
struct afs_fs_context *ctx = fc->fs_private;
- int opt;
+ int ret, opt;
+
+ ret = vfs_parse_sb_flag(fc, param);
+ if (ret != -ENOPARAM)
+ return ret;

opt = fs_parse(fc, &afs_fs_parameters, param, &result);
if (opt < 0)
diff --git a/fs/fs_context.c b/fs/fs_context.c
index e56310fd8c75..a9f314390b99 100644
--- a/fs/fs_context.c
+++ b/fs/fs_context.c
@@ -81,7 +81,7 @@ static const char *const forbidden_sb_flag[] = {
/*
* Check for a common mount option that manipulates s_flags.
*/
-static int vfs_parse_sb_flag(struct fs_context *fc, struct fs_parameter *param)
+int vfs_parse_sb_flag(struct fs_context *fc, struct fs_parameter *param)
{
const char *key = param->key;
unsigned int set, clear;
@@ -105,6 +105,7 @@ static int vfs_parse_sb_flag(struct fs_context *fc, struct fs_parameter *param)
fc->sb_flags_mask |= set | clear;
return 0;
}
+EXPORT_SYMBOL(vfs_parse_sb_flag);

/**
* vfs_parse_fs_param - Add a single parameter to a superblock config
@@ -129,10 +130,6 @@ int vfs_parse_fs_param(struct fs_context *fc, struct fs_parameter *param)
if (!param->key)
return invalf(fc, "Unnamed parameter\n");

- ret = vfs_parse_sb_flag(fc, param);
- if (ret != -ENOPARAM)
- return ret;
-
ret = security_fs_context_parse_param(fc, param);
if (ret != -ENOPARAM)
/* Param belongs to the LSM or is disallowed by the LSM; so
@@ -561,6 +558,11 @@ static int legacy_parse_param(struct fs_context *fc, struct fs_parameter *param)
struct legacy_fs_context *ctx = fc->fs_private;
unsigned int size = ctx->data_size;
size_t len = 0;
+ int ret;
+
+ ret = vfs_parse_sb_flag(fc, param);
+ if (ret != -ENOPARAM)
+ return ret;

if (strcmp(param->key, "source") == 0) {
if (param->type != fs_value_is_string)
diff --git a/fs/fuse/control.c b/fs/fuse/control.c
index 14ce1e47f980..c35013ed7f65 100644
--- a/fs/fuse/control.c
+++ b/fs/fuse/control.c
@@ -351,6 +351,7 @@ static int fuse_ctl_get_tree(struct fs_context *fc)

static const struct fs_context_operations fuse_ctl_context_ops = {
.get_tree = fuse_ctl_get_tree,
+ .parse_param = vfs_parse_fs_param,
};

static int fuse_ctl_init_fs_context(struct fs_context *fc)
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 1dcc57189382..89125cc36d0e 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -1149,7 +1149,11 @@ static int hugetlbfs_parse_param(struct fs_context *fc, struct fs_parameter *par
struct fs_parse_result result;
char *rest;
unsigned long ps;
- int opt;
+ int ret, opt;
+
+ ret = vfs_parse_sb_flag(fc, param);
+ if (ret != -ENOPARAM)
+ return ret;

opt = fs_parse(fc, &hugetlb_fs_parameters, param, &result);
if (opt < 0)
diff --git a/fs/proc/root.c b/fs/proc/root.c
index 8b145e7b9661..6ef1527ad975 100644
--- a/fs/proc/root.c
+++ b/fs/proc/root.c
@@ -56,7 +56,11 @@ static int proc_parse_param(struct fs_context *fc, struct fs_parameter *param)
{
struct proc_fs_context *ctx = fc->fs_private;
struct fs_parse_result result;
- int opt;
+ int ret, opt;
+
+ ret = vfs_parse_sb_flag(fc, param);
+ if (ret != -ENOPARAM)
+ return ret;

opt = fs_parse(fc, &proc_fs_parameters, param, &result);
if (opt < 0)
diff --git a/fs/sysfs/mount.c b/fs/sysfs/mount.c
index 1b56686ab178..ba576a976e8c 100644
--- a/fs/sysfs/mount.c
+++ b/fs/sysfs/mount.c
@@ -49,6 +49,7 @@ static void sysfs_fs_context_free(struct fs_context *fc)

static const struct fs_context_operations sysfs_fs_context_ops = {
.free = sysfs_fs_context_free,
+ .parse_param = vfs_parse_sb_flag,
.get_tree = sysfs_get_tree,
};

diff --git a/include/linux/fs_context.h b/include/linux/fs_context.h
index d476ff0c10df..39f4d8b0a390 100644
--- a/include/linux/fs_context.h
+++ b/include/linux/fs_context.h
@@ -127,6 +127,7 @@ extern struct fs_context *fs_context_for_submount(struct file_system_type *fs_ty
struct dentry *reference);

extern struct fs_context *vfs_dup_fs_context(struct fs_context *fc);
+extern int vfs_parse_sb_flag(struct fs_context *fc, struct fs_parameter *param);
extern int vfs_parse_fs_param(struct fs_context *fc, struct fs_parameter *param);
extern int vfs_parse_fs_string(struct fs_context *fc, const char *key,
const char *value, size_t v_size);
diff --git a/ipc/mqueue.c b/ipc/mqueue.c
index 216cad1ff0d0..557aa887996a 100644
--- a/ipc/mqueue.c
+++ b/ipc/mqueue.c
@@ -1577,6 +1577,7 @@ static const struct super_operations mqueue_super_ops = {

static const struct fs_context_operations mqueue_fs_context_ops = {
.free = mqueue_fs_context_free,
+ .parse_param = vfs_parse_sb_flag,
.get_tree = mqueue_get_tree,
};

diff --git a/kernel/cgroup/cgroup-v1.c b/kernel/cgroup/cgroup-v1.c
index 88006be40ea3..f960e6149311 100644
--- a/kernel/cgroup/cgroup-v1.c
+++ b/kernel/cgroup/cgroup-v1.c
@@ -927,7 +927,11 @@ int cgroup1_parse_param(struct fs_context *fc, struct fs_parameter *param)
struct cgroup_fs_context *ctx = cgroup_fc2context(fc);
struct cgroup_subsys *ss;
struct fs_parse_result result;
- int opt, i;
+ int ret, opt, i;
+
+ ret = vfs_parse_sb_flag(fc, param);
+ if (ret != -ENOPARAM)
+ return ret;

opt = fs_parse(fc, &cgroup1_fs_parameters, param, &result);
if (opt == -ENOPARAM) {
diff --git a/kernel/cgroup/cgroup.c b/kernel/cgroup/cgroup.c
index bf9dbffd46b1..93890285b510 100644
--- a/kernel/cgroup/cgroup.c
+++ b/kernel/cgroup/cgroup.c
@@ -1834,7 +1834,11 @@ static int cgroup2_parse_param(struct fs_context *fc, struct fs_parameter *param
{
struct cgroup_fs_context *ctx = cgroup_fc2context(fc);
struct fs_parse_result result;
- int opt;
+ int ret, opt;
+
+ ret = vfs_parse_sb_flag(fc, param);
+ if (ret != -ENOPARAM)
+ return ret;

opt = fs_parse(fc, &cgroup2_fs_parameters, param, &result);
if (opt < 0)
diff --git a/kernel/cgroup/cpuset.c b/kernel/cgroup/cpuset.c
index 515525ff1cfd..025f6c6083a3 100644
--- a/kernel/cgroup/cpuset.c
+++ b/kernel/cgroup/cpuset.c
@@ -394,6 +394,7 @@ static int cpuset_get_tree(struct fs_context *fc)
}

static const struct fs_context_operations cpuset_fs_context_ops = {
+ .parse_param = vfs_parse_sb_flag,
.get_tree = cpuset_get_tree,
};

--
2.21.0
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