Messages in this thread Patch in this message | | | Date | Mon, 12 Nov 2012 14:14:45 +0400 | From | Cyrill Gorcunov <> | Subject | [patch 5/7] fs, eventfd: Add procfs fdinfo helper |
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This allow us to print out raw counter value. The /proc/pid/fdinfo/fd output is
| pos: 0 | flags: 04002 | eventfd-count: 5a
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> CC: Pavel Emelyanov <xemul@parallels.com> CC: Al Viro <viro@ZenIV.linux.org.uk> CC: Alexey Dobriyan <adobriyan@gmail.com> CC: Andrew Morton <akpm@linux-foundation.org> CC: James Bottomley <jbottomley@parallels.com> CC: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> CC: Alexey Dobriyan <adobriyan@gmail.com> CC: Matthew Helsley <matt.helsley@gmail.com> CC: "J. Bruce Fields" <bfields@fieldses.org> CC: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> --- fs/eventfd.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+)
Index: linux-2.6.git/fs/eventfd.c =================================================================== --- linux-2.6.git.orig/fs/eventfd.c +++ linux-2.6.git/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 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,
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