diff options
| -rw-r--r-- | fs/eventfd.c | 20 |
1 files changed, 20 insertions, 0 deletions
diff --git a/fs/eventfd.c b/fs/eventfd.c index d81b9f654086..35470d9b96e6 100644 --- a/fs/eventfd.c +++ b/fs/eventfd.c @@ -19,6 +19,8 @@ #include <linux/export.h> #include <linux/kref.h> #include <linux/eventfd.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> struct eventfd_ctx { struct kref kref; @@ -284,7 +286,25 @@ static ssize_t eventfd_write(struct file *file, const char __user *buf, size_t c return res; } +#ifdef CONFIG_PROC_FS +static int eventfd_show_fdinfo(struct seq_file *m, struct file *f) +{ + struct eventfd_ctx *ctx = f->private_data; + int ret; + + spin_lock_irq(&ctx->wqh.lock); + ret = seq_printf(m, "eventfd-count: %16llx\n", + (unsigned long long)ctx->count); + spin_unlock_irq(&ctx->wqh.lock); + + return ret; +} +#endif + static const struct file_operations eventfd_fops = { +#ifdef CONFIG_PROC_FS + .show_fdinfo = eventfd_show_fdinfo, +#endif .release = eventfd_release, .poll = eventfd_poll, .read = eventfd_read, |