fs, eventfd: add procfs fdinfo helper
This allows 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> Acked-by: Pavel Emelyanov <xemul@parallels.com> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Andrey Vagin <avagin@openvz.org> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: Alexey Dobriyan <adobriyan@gmail.com> 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> Cc: Tvrtko Ursulin <tvrtko.ursulin@onelan.co.uk> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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fs/eventfd.c
20
fs/eventfd.c
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@ -19,6 +19,8 @@
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#include <linux/export.h>
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#include <linux/export.h>
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#include <linux/kref.h>
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#include <linux/kref.h>
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#include <linux/eventfd.h>
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#include <linux/eventfd.h>
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#include <linux/proc_fs.h>
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#include <linux/seq_file.h>
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struct eventfd_ctx {
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struct eventfd_ctx {
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struct kref kref;
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struct kref kref;
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@ -284,7 +286,25 @@ static ssize_t eventfd_write(struct file *file, const char __user *buf, size_t c
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return res;
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return res;
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}
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}
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#ifdef CONFIG_PROC_FS
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static int eventfd_show_fdinfo(struct seq_file *m, struct file *f)
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{
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struct eventfd_ctx *ctx = f->private_data;
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int ret;
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spin_lock_irq(&ctx->wqh.lock);
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ret = seq_printf(m, "eventfd-count: %16llx\n",
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(unsigned long long)ctx->count);
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spin_unlock_irq(&ctx->wqh.lock);
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return ret;
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}
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#endif
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static const struct file_operations eventfd_fops = {
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static const struct file_operations eventfd_fops = {
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#ifdef CONFIG_PROC_FS
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.show_fdinfo = eventfd_show_fdinfo,
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#endif
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.release = eventfd_release,
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.release = eventfd_release,
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.poll = eventfd_poll,
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.poll = eventfd_poll,
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.read = eventfd_read,
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.read = eventfd_read,
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