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[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>
hifive-unleashed-5.1
Eric W. Biederman 2006-06-26 00:25:47 -07:00 committed by Linus Torvalds
parent 0f2fe20f55
commit 6e66b52bf5
1 changed files with 19 additions and 2 deletions
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21
fs/proc/base.c
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@ -1532,6 +1532,7 @@ out:
static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldir);
static struct dentry *proc_task_lookup(struct inode *dir, struct dentry * dentry, struct nameidata *nd);
static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat);
static struct file_operations proc_fd_operations = {
.read = generic_read_dir,
@ -1552,6 +1553,7 @@ static struct inode_operations proc_fd_inode_operations = {
static struct inode_operations proc_task_inode_operations = {
.lookup = proc_task_lookup,
.getattr = proc_task_getattr,
};
#ifdef CONFIG_SECURITY
@ -1658,7 +1660,7 @@ static struct dentry *proc_pident_lookup(struct inode *dir,
*/
switch(p->type) {
case PROC_TGID_TASK:
inode->i_nlink = 2 + get_tid_list(2, NULL, dir);
inode->i_nlink = 2;
inode->i_op = &proc_task_inode_operations;
inode->i_fop = &proc_task_operations;
break;
@ -2261,7 +2263,6 @@ static int proc_task_readdir(struct file * filp, void * dirent, filldir_t filldi
}
nr_tids = get_tid_list(pos, tid_array, inode);
inode->i_nlink = pos + nr_tids;
for (i = 0; i < nr_tids; i++) {
unsigned long j = PROC_NUMBUF;
@ -2281,3 +2282,19 @@ out:
filp->f_pos = pos;
return retval;
}
static int proc_task_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
{
struct inode *inode = dentry->d_inode;
struct task_struct *p = proc_task(inode);
generic_fillattr(inode, stat);
if (pid_alive(p)) {
task_lock(p);
if (p->signal)
stat->nlink += atomic_read(&p->signal->count);
task_unlock(p);
}
return 0;
}