[PATCH] proc: Fix the link count for /proc/<pid>/task
Use getattr to get an accurate link count when needed. This is cheaper and more accurate than trying to derive it by walking the thread list of a process. Especially as it happens when needed stat instead of at readdir time. Signed-off-by: Eric W. Biederman <ebiederm@xmission.com> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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@ -1532,6 +1532,7 @@ out:
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static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir);
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static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd);
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static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat);
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static struct file_operations proc_fd_operations = {
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.read = generic_read_dir,
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@ -1552,6 +1553,7 @@ static struct inode_operations proc_fd_inode_operations = {
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static struct inode_operations proc_task_inode_operations = {
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.lookup = proc_task_lookup,
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.getattr = proc_task_getattr,
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};
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#ifdef CONFIG_SECURITY
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@ -1658,7 +1660,7 @@ static struct dentry *proc_pident_lookup(struct inode *dir,
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*/
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switch(p->type) {
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case PROC_TGID_TASK:
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inode->i_nlink = 2 + get_tid_list(2, NULL, dir);
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inode->i_nlink = 2;
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inode->i_op = &proc_task_inode_operations;
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inode->i_fop = &proc_task_operations;
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break;
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@ -2261,7 +2263,6 @@ static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldi
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}
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nr_tids = get_tid_list(pos, tid_array, inode);
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inode->i_nlink = pos + nr_tids;
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for (i = 0; i < nr_tids; i++) {
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unsigned long j = PROC_NUMBUF;
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@ -2281,3 +2282,19 @@ out:
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filp->f_pos = pos;
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return retval;
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}
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static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
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{
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struct inode *inode = dentry->d_inode;
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struct task_struct *p = proc_task(inode);
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generic_fillattr(inode, stat);
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if (pid_alive(p)) {
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task_lock(p);
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if (p->signal)
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stat->nlink += atomic_read(&p->signal->count);
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task_unlock(p);
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}
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return 0;
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}
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