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fs/locks: print full locks information

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Commit fd7732e033 ("fs/locks: create a tree of dependent requests.")
has put blocked locks into a tree.

So, with a for loop, we can't check all locks information.

To solve this problem, we should traverse the tree.

Signed-off-by: Luo Longjun <luolongjun@huawei.com>
Signed-off-by: Jeff Layton <jlayton@kernel.org>
This commit is contained in:
Luo Longjun 2021-02-25 22:58:29 -05:00 committed by Jeff Layton
parent a38fd87484
commit b8da9b10e2
1 changed files with 56 additions and 9 deletions
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65
fs/locks.c
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@ -2828,7 +2828,7 @@ struct locks_iterator {
};
static void lock_get_status(struct seq_file *f, struct file_lock *fl,
loff_t id, char *pfx)
loff_t id, char *pfx, int repeat)
{
struct inode *inode = NULL;
unsigned int fl_pid;
@ -2844,7 +2844,11 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
if (fl->fl_file != NULL)
inode = locks_inode(fl->fl_file);
seq_printf(f, "%lld:%s ", id, pfx);
seq_printf(f, "%lld: ", id);
if (repeat)
seq_printf(f, "%*s", repeat - 1 + (int)strlen(pfx), pfx);
if (IS_POSIX(fl)) {
if (fl->fl_flags & FL_ACCESS)
seq_puts(f, "ACCESS");
@ -2906,21 +2910,64 @@ static void lock_get_status(struct seq_file *f, struct file_lock *fl,
}
}
static struct file_lock *get_next_blocked_member(struct file_lock *node)
{
struct file_lock *tmp;
/* NULL node or root node */
if (node == NULL || node->fl_blocker == NULL)
return NULL;
/* Next member in the linked list could be itself */
tmp = list_next_entry(node, fl_blocked_member);
if (list_entry_is_head(tmp, &node->fl_blocker->fl_blocked_requests, fl_blocked_member)
|| tmp == node) {
return NULL;
}
return tmp;
}
static int locks_show(struct seq_file *f, void *v)
{
struct locks_iterator *iter = f->private;
struct file_lock *fl, *bfl;
struct file_lock *cur, *tmp;
struct pid_namespace *proc_pidns = proc_pid_ns(file_inode(f->file)->i_sb);
int level = 0;
fl = hlist_entry(v, struct file_lock, fl_link);
cur = hlist_entry(v, struct file_lock, fl_link);
if (locks_translate_pid(fl, proc_pidns) == 0)
if (locks_translate_pid(cur, proc_pidns) == 0)
return 0;
lock_get_status(f, fl, iter->li_pos, "");
/* View this crossed linked list as a binary tree, the first member of fl_blocked_requests
* is the left child of current node, the next silibing in fl_blocked_member is the
* right child, we can alse get the parent of current node from fl_blocker, so this
* question becomes traversal of a binary tree
*/
while (cur != NULL) {
if (level)
lock_get_status(f, cur, iter->li_pos, "-> ", level);
else
lock_get_status(f, cur, iter->li_pos, "", level);
list_for_each_entry(bfl, &fl->fl_blocked_requests, fl_blocked_member)
lock_get_status(f, bfl, iter->li_pos, " ->");
if (!list_empty(&cur->fl_blocked_requests)) {
/* Turn left */
cur = list_first_entry_or_null(&cur->fl_blocked_requests,
struct file_lock, fl_blocked_member);
level++;
} else {
/* Turn right */
tmp = get_next_blocked_member(cur);
/* Fall back to parent node */
while (tmp == NULL && cur->fl_blocker != NULL) {
cur = cur->fl_blocker;
level--;
tmp = get_next_blocked_member(cur);
}
cur = tmp;
}
}
return 0;
}
@ -2941,7 +2988,7 @@ static void __show_fd_locks(struct seq_file *f,
(*id)++;
seq_puts(f, "lock:\t");
lock_get_status(f, fl, *id, "");
lock_get_status(f, fl, *id, "", 0);
}
}