proc: implement proc_single_file_operations
Currently many /proc/pid files use a crufty precursor to the current seq_file api, and they don't have direct access to the pid_namespace or the pid of for which they are displaying data. So implement proc_single_file_operations to make the seq_file routines easy to use, and to give access to the full state of the pid of we are displaying data for. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Cc: Oleg Nesterov <oleg@tv-sign.ru> Cc: Alexey Dobriyan <adobriyan@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -121,6 +121,10 @@ struct pid_entry {
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NOD(NAME, (S_IFREG|(MODE)), \
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NULL, &proc_info_file_operations, \
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{ .proc_read = &proc_##OTYPE } )
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#define ONE(NAME, MODE, OTYPE) \
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NOD(NAME, (S_IFREG|(MODE)), \
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NULL, &proc_single_file_operations, \
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{ .proc_show = &proc_##OTYPE } )
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int maps_protect;
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EXPORT_SYMBOL(maps_protect);
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@ -658,6 +662,45 @@ static const struct file_operations proc_info_file_operations = {
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.read = proc_info_read,
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};
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static int proc_single_show(struct seq_file *m, void *v)
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{
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struct inode *inode = m->private;
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struct pid_namespace *ns;
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struct pid *pid;
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struct task_struct *task;
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int ret;
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ns = inode->i_sb->s_fs_info;
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pid = proc_pid(inode);
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task = get_pid_task(pid, PIDTYPE_PID);
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if (!task)
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return -ESRCH;
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ret = PROC_I(inode)->op.proc_show(m, ns, pid, task);
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put_task_struct(task);
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return ret;
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}
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static int proc_single_open(struct inode *inode, struct file *filp)
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{
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int ret;
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ret = single_open(filp, proc_single_show, NULL);
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if (!ret) {
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struct seq_file *m = filp->private_data;
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m->private = inode;
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}
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return ret;
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}
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static const struct file_operations proc_single_file_operations = {
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.open = proc_single_open,
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.read = seq_read,
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.llseek = seq_lseek,
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.release = single_release,
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};
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static int mem_open(struct inode* inode, struct file* file)
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{
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file->private_data = (void*)((long)current->self_exec_id);
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@ -262,6 +262,9 @@ extern void kclist_add(struct kcore_list *, void *, size_t);
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union proc_op {
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int (*proc_get_link)(struct inode *, struct dentry **, struct vfsmount **);
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int (*proc_read)(struct task_struct *task, char *page);
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int (*proc_show)(struct seq_file *m,
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struct pid_namespace *ns, struct pid *pid,
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struct task_struct *task);
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};
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struct proc_inode {
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