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proc: introduce a proc_pid_ns helper

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Factor out retrieving the per-sb pid namespaces from the sb private data
into an easier to understand helper.

Suggested-by: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Christoph Hellwig 2018-05-16 07:19:01 +02:00
parent 441bc62741
commit 76f668be1e
5 changed files with 19 additions and 20 deletions
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7
fs/proc/array.c
View File

@ -677,12 +677,7 @@ get_children_pid(struct inode *inode, struct pid *pid_prev, loff_t pos)
static int children_seq_show(struct seq_file *seq, void *v)
{
struct inode *inode = seq->private;
pid_t pid;
pid = pid_nr_ns(v, inode->i_sb->s_fs_info);
seq_printf(seq, "%d ", pid);
seq_printf(seq, "%d ", pid_nr_ns(v, proc_pid_ns(seq->private)));
return 0;
}

18
fs/proc/base.c
View File

@ -698,7 +698,7 @@ static bool has_pid_permissions(struct pid_namespace *pid,
static int proc_pid_permission(struct inode *inode, int mask)
{
struct pid_namespace *pid = inode->i_sb->s_fs_info;
struct pid_namespace *pid = proc_pid_ns(inode);
struct task_struct *task;
bool has_perms;
@ -733,13 +733,11 @@ static const struct inode_operations proc_def_inode_operations = {
static int proc_single_show(struct seq_file *m, void *v)
{
struct inode *inode = m->private;
struct pid_namespace *ns;
struct pid *pid;
struct pid_namespace *ns = proc_pid_ns(inode);
struct pid *pid = proc_pid(inode);
struct task_struct *task;
int ret;
ns = inode->i_sb->s_fs_info;
pid = proc_pid(inode);
task = get_pid_task(pid, PIDTYPE_PID);
if (!task)
return -ESRCH;
@ -1410,7 +1408,7 @@ static const struct file_operations proc_fail_nth_operations = {
static int sched_show(struct seq_file *m, void *v)
{
struct inode *inode = m->private;
struct pid_namespace *ns = inode->i_sb->s_fs_info;
struct pid_namespace *ns = proc_pid_ns(inode);
struct task_struct *p;
p = get_proc_task(inode);
@ -1782,8 +1780,8 @@ int pid_getattr(const struct path *path, struct kstat *stat,
u32 request_mask, unsigned int query_flags)
{
struct inode *inode = d_inode(path->dentry);
struct pid_namespace *pid = proc_pid_ns(inode);
struct task_struct *task;
struct pid_namespace *pid = path->dentry->d_sb->s_fs_info;
generic_fillattr(inode, stat);
@ -2337,7 +2335,7 @@ static int proc_timers_open(struct inode *inode, struct file *file)
return -ENOMEM;
tp->pid = proc_pid(inode);
tp->ns = inode->i_sb->s_fs_info;
tp->ns = proc_pid_ns(inode);
return 0;
}
@ -3239,7 +3237,7 @@ static struct tgid_iter next_tgid(struct pid_namespace *ns, struct tgid_iter ite
int proc_pid_readdir(struct file *file, struct dir_context *ctx)
{
struct tgid_iter iter;
struct pid_namespace *ns = file_inode(file)->i_sb->s_fs_info;
struct pid_namespace *ns = proc_pid_ns(file_inode(file));
loff_t pos = ctx->pos;
if (pos >= PID_MAX_LIMIT + TGID_OFFSET)
@ -3588,7 +3586,7 @@ static int proc_task_readdir(struct file *file, struct dir_context *ctx)
/* f_version caches the tgid value that the last readdir call couldn't
* return. lseek aka telldir automagically resets f_version to 0.
*/
ns = inode->i_sb->s_fs_info;
ns = proc_pid_ns(inode);
tid = (int)file->f_version;
file->f_version = 0;
for (task = first_tid(proc_pid(inode), tid, ctx->pos - 2, ns);

4
fs/proc/self.c
View File

@ -12,7 +12,7 @@ static const char *proc_self_get_link(struct dentry *dentry,
struct inode *inode,
struct delayed_call *done)
{
struct pid_namespace *ns = inode->i_sb->s_fs_info;
struct pid_namespace *ns = proc_pid_ns(inode);
pid_t tgid = task_tgid_nr_ns(current, ns);
char *name;
@ -36,7 +36,7 @@ static unsigned self_inum __ro_after_init;
int proc_setup_self(struct super_block *s)
{
struct inode *root_inode = d_inode(s->s_root);
struct pid_namespace *ns = s->s_fs_info;
struct pid_namespace *ns = proc_pid_ns(root_inode);
struct dentry *self;
inode_lock(root_inode);

4
fs/proc/thread_self.c
View File

@ -12,7 +12,7 @@ static const char *proc_thread_self_get_link(struct dentry *dentry,
struct inode *inode,
struct delayed_call *done)
{
struct pid_namespace *ns = inode->i_sb->s_fs_info;
struct pid_namespace *ns = proc_pid_ns(inode);
pid_t tgid = task_tgid_nr_ns(current, ns);
pid_t pid = task_pid_nr_ns(current, ns);
char *name;
@ -36,7 +36,7 @@ static unsigned thread_self_inum __ro_after_init;
int proc_setup_thread_self(struct super_block *s)
{
struct inode *root_inode = d_inode(s->s_root);
struct pid_namespace *ns = s->s_fs_info;
struct pid_namespace *ns = proc_pid_ns(root_inode);
struct dentry *thread_self;
inode_lock(root_inode);

6
include/linux/proc_fs.h
View File

@ -83,4 +83,10 @@ struct ns_common;
int open_related_ns(struct ns_common *ns,
struct ns_common *(*get_ns)(struct ns_common *ns));
/* get the associated pid namespace for a file in procfs */
static inline struct pid_namespace *proc_pid_ns(struct inode *inode)
{
return inode->i_sb->s_fs_info;
}
#endif /* _LINUX_PROC_FS_H */