[PATCH 16/38] vfs: Remove unused code after filesystem context changes [ver #10]

David Howells
2018-07-27T17:33:16Z

Remove code that is now unused after the filesystem context changes.

Signed-off-by: David Howells <dhowells@redhat.com>
---

fs/internal.h | 2 -
fs/super.c | 62 --------------------------------------------
include/linux/lsm_hooks.h | 3 --
include/linux/security.h | 7 -----
security/security.c | 5 ----
security/selinux/hooks.c | 20 --------------
security/smack/smack_lsm.c | 33 -----------------------
7 files changed, 132 deletions(-)

diff --git a/fs/internal.h b/fs/internal.h
index 546302e98a04..e5bdfc52b9a1 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -109,8 +109,6 @@ extern struct file *get_empty_filp(void);
extern int do_remount_sb(struct super_block *, int, void *, size_t, int,
struct fs_context *);
extern bool trylock_super(struct super_block *sb);
-extern struct dentry *mount_fs(struct file_system_type *,
- int, const char *, void *, size_t);
extern struct super_block *user_get_super(dev_t);

/*
diff --git a/fs/super.c b/fs/super.c
index 7c5541453081..bbef5a5057c0 100644
--- a/fs/super.c
+++ b/fs/super.c
@@ -1442,68 +1442,6 @@ struct dentry *mount_single(struct file_system_type *fs_type,
}
EXPORT_SYMBOL(mount_single);

-struct dentry *
-mount_fs(struct file_system_type *type, int flags, const char *name,
- void *data, size_t data_size)
-{
- struct dentry *root;
- struct super_block *sb;
- char *secdata = NULL;
- int error = -ENOMEM;
-
- if (data && !(type->fs_flags & FS_BINARY_MOUNTDATA)) {
- secdata = alloc_secdata();
- if (!secdata)
- goto out;
-
- error = security_sb_copy_data(data, data_size, secdata);
- if (error)
- goto out_free_secdata;
- }
-
- root = type->mount(type, flags, name, data, data_size);
- if (IS_ERR(root)) {
- error = PTR_ERR(root);
- goto out_free_secdata;
- }
- sb = root->d_sb;
- BUG_ON(!sb);
- WARN_ON(!sb->s_bdi);
-
- /*
- * Write barrier is for super_cache_count(). We place it before setting
- * SB_BORN as the data dependency between the two functions is the
- * superblock structure contents that we just set up, not the SB_BORN
- * flag.
- */
- smp_wmb();
- sb->s_flags |= SB_BORN;
-
- error = security_sb_kern_mount(sb, flags, secdata, data_size);
- if (error)
- goto out_sb;
-
- /*
- * filesystems should never set s_maxbytes larger than MAX_LFS_FILESIZE
- * but s_maxbytes was an unsigned long long for many releases. Throw
- * this warning for a little while to try and catch filesystems that
- * violate this rule.
- */
- WARN((sb->s_maxbytes < 0), "%s set sb->s_maxbytes to "
- "negative value (%lld)\n", type->name, sb->s_maxbytes);
-
- up_write(&sb->s_umount);
- free_secdata(secdata);
- return root;
-out_sb:
- dput(root);
- deactivate_locked_super(sb);
-out_free_secdata:
- free_secdata(secdata);
-out:
- return ERR_PTR(error);
-}
-
/*
* Setup private BDI for given superblock. It gets automatically cleaned up
* in generic_shutdown_super().
diff --git a/include/linux/lsm_hooks.h b/include/linux/lsm_hooks.h
index 60a9a40bd46c..b1a62dc0b8d9 100644
--- a/include/linux/lsm_hooks.h
+++ b/include/linux/lsm_hooks.h
@@ -1519,8 +1519,6 @@ union security_list_options {
void (*sb_free_security)(struct super_block *sb);
int (*sb_copy_data)(char *orig, size_t orig_size, char *copy);
int (*sb_remount)(struct super_block *sb, void *data, size_t data_size);
- int (*sb_kern_mount)(struct super_block *sb, int flags,
- void *data, size_t data_size);
int (*sb_show_options)(struct seq_file *m, struct super_block *sb);
int (*sb_statfs)(struct dentry *dentry);
int (*sb_mount)(const char *dev_name, const struct path *path,
@@ -1868,7 +1866,6 @@ struct security_hook_heads {
struct hlist_head sb_free_security;
struct hlist_head sb_copy_data;
struct hlist_head sb_remount;
- struct hlist_head sb_kern_mount;
struct hlist_head sb_show_options;
struct hlist_head sb_statfs;
struct hlist_head sb_mount;
diff --git a/include/linux/security.h b/include/linux/security.h
index a8b1056ed6e4..c73d9ba863bc 100644
--- a/include/linux/security.h
+++ b/include/linux/security.h
@@ -241,7 +241,6 @@ int security_sb_alloc(struct super_block *sb);
void security_sb_free(struct super_block *sb);
int security_sb_copy_data(char *orig, size_t orig_size, char *copy);
int security_sb_remount(struct super_block *sb, void *data, size_t data_size);
-int security_sb_kern_mount(struct super_block *sb, int flags, void *data, size_t data_size);
int security_sb_show_options(struct seq_file *m, struct super_block *sb);
int security_sb_statfs(struct dentry *dentry);
int security_sb_mount(const char *dev_name, const struct path *path,
@@ -591,12 +590,6 @@ static inline int security_sb_remount(struct super_block *sb, void *data, size_t
return 0;
}

-static inline int security_sb_kern_mount(struct super_block *sb, int flags,
- void *data, size_t data_size)
-{
- return 0;
-}
-
static inline int security_sb_show_options(struct seq_file *m,
struct super_block *sb)
{
diff --git a/security/security.c b/security/security.c
index 9bdc21ae645c..2439a5613813 100644
--- a/security/security.c
+++ b/security/security.c
@@ -420,11 +420,6 @@ int security_sb_remount(struct super_block *sb, void *data, size_t data_size)
return call_int_hook(sb_remount, 0, sb, data, data_size);
}

-int security_sb_kern_mount(struct super_block *sb, int flags, void *data, size_t data_size)
-{
- return call_int_hook(sb_kern_mount, 0, sb, flags, data, data_size);
-}
-
int security_sb_show_options(struct seq_file *m, struct super_block *sb)
{
return call_int_hook(sb_show_options, 0, m, sb);
diff --git a/security/selinux/hooks.c b/security/selinux/hooks.c
index 9774d1f0e99f..3d5b09c256c1 100644
--- a/security/selinux/hooks.c
+++ b/security/selinux/hooks.c
@@ -2924,25 +2924,6 @@ static int selinux_sb_remount(struct super_block *sb, void *data, size_t data_si
goto out_free_opts;
}

-static int selinux_sb_kern_mount(struct super_block *sb, int flags, void *data, size_t data_size)
-{
- const struct cred *cred = current_cred();
- struct common_audit_data ad;
- int rc;
-
- rc = superblock_doinit(sb, data);
- if (rc)
- return rc;
-
- /* Allow all mounts performed by the kernel */
- if (flags & MS_KERNMOUNT)
- return 0;
-
- ad.type = LSM_AUDIT_DATA_DENTRY;
- ad.u.dentry = sb->s_root;
- return superblock_has_perm(cred, sb, FILESYSTEM__MOUNT, &ad);
-}
-
static int selinux_sb_statfs(struct dentry *dentry)
{
const struct cred *cred = current_cred();
@@ -7200,7 +7181,6 @@ static struct security_hook_list selinux_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(sb_free_security, selinux_sb_free_security),
LSM_HOOK_INIT(sb_copy_data, selinux_sb_copy_data),
LSM_HOOK_INIT(sb_remount, selinux_sb_remount),
- LSM_HOOK_INIT(sb_kern_mount, selinux_sb_kern_mount),
LSM_HOOK_INIT(sb_show_options, selinux_sb_show_options),
LSM_HOOK_INIT(sb_statfs, selinux_sb_statfs),
LSM_HOOK_INIT(sb_mount, selinux_mount),
diff --git a/security/smack/smack_lsm.c b/security/smack/smack_lsm.c
index 339ac4d42785..5f2938325ddf 100644
--- a/security/smack/smack_lsm.c
+++ b/security/smack/smack_lsm.c
@@ -1178,38 +1178,6 @@ static int smack_set_mnt_opts(struct super_block *sb,
return 0;
}

-/**
- * smack_sb_kern_mount - Smack specific mount processing
- * @sb: the file system superblock
- * @flags: the mount flags
- * @data: the smack mount options
- *
- * Returns 0 on success, an error code on failure
- */
-static int smack_sb_kern_mount(struct super_block *sb, int flags,
- void *data, size_t data_size)
-{
- int rc = 0;
- char *options = data;
- struct security_mnt_opts opts;
-
- security_init_mnt_opts(&opts);
-
- if (!options)
- goto out;
-
- rc = smack_parse_opts_str(options, &opts);
- if (rc)
- goto out_err;
-
-out:
- rc = smack_set_mnt_opts(sb, &opts, 0, NULL);
-
-out_err:
- security_free_mnt_opts(&opts);
- return rc;
-}
-
/**
* smack_sb_statfs - Smack check on statfs
* @dentry: identifies the file system in question
@@ -4989,7 +4957,6 @@ static struct security_hook_list smack_hooks[] __lsm_ro_after_init = {
LSM_HOOK_INIT(sb_alloc_security, smack_sb_alloc_security),
LSM_HOOK_INIT(sb_free_security, smack_sb_free_security),
LSM_HOOK_INIT(sb_copy_data, smack_sb_copy_data),
- LSM_HOOK_INIT(sb_kern_mount, smack_sb_kern_mount),
LSM_HOOK_INIT(sb_statfs, smack_sb_statfs),
LSM_HOOK_INIT(sb_set_mnt_opts, smack_set_mnt_opts),
LSM_HOOK_INIT(sb_parse_opts_str, smack_parse_opts_str),