diff options
| author | Cyrill Gorcunov <gorcunov@openvz.org> | 2012-12-17 16:05:02 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-12-17 17:15:27 -0800 |
| commit | 138d22b58696c506799f8de759804083ff9effae (patch) | |
| tree | 4c2af24ab90ececcfd30693cb6e17ab60e30bb86 /fs/eventpoll.c | |
| parent | cbac5542d48127b546a23d816380a7926eee1c25 (diff) | |
| download | linux-stable-138d22b58696c506799f8de759804083ff9effae.tar.gz linux-stable-138d22b58696c506799f8de759804083ff9effae.tar.bz2 linux-stable-138d22b58696c506799f8de759804083ff9effae.zip | |
fs, epoll: add procfs fdinfo helper
This allows us to print out eventpoll target file descriptor, events and
data, the /proc/pid/fdinfo/fd consists of
| pos: 0
| flags: 02
| tfd: 5 events: 1d data: ffffffffffffffff enabled: 1
[avagin@: fix for unitialized ret variable]
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>
Diffstat (limited to 'fs/eventpoll.c')
| -rw-r--r-- | fs/eventpoll.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/fs/eventpoll.c b/fs/eventpoll.c index cd96649bfe62..be56b21435f8 100644 --- a/fs/eventpoll.c +++ b/fs/eventpoll.c @@ -38,6 +38,8 @@ #include <asm/io.h> #include <asm/mman.h> #include <linux/atomic.h> +#include <linux/proc_fs.h> +#include <linux/seq_file.h> /* * LOCKING: @@ -783,8 +785,34 @@ static unsigned int ep_eventpoll_poll(struct file *file, poll_table *wait) return pollflags != -1 ? pollflags : 0; } +#ifdef CONFIG_PROC_FS +static int ep_show_fdinfo(struct seq_file *m, struct file *f) +{ + struct eventpoll *ep = f->private_data; + struct rb_node *rbp; + int ret = 0; + + mutex_lock(&ep->mtx); + for (rbp = rb_first(&ep->rbr); rbp; rbp = rb_next(rbp)) { + struct epitem *epi = rb_entry(rbp, struct epitem, rbn); + + ret = seq_printf(m, "tfd: %8d events: %8x data: %16llx\n", + epi->ffd.fd, epi->event.events, + (long long)epi->event.data); + if (ret) + break; + } + mutex_unlock(&ep->mtx); + + return ret; +} +#endif + /* File callbacks that implement the eventpoll file behaviour */ static const struct file_operations eventpoll_fops = { +#ifdef CONFIG_PROC_FS + .show_fdinfo = ep_show_fdinfo, +#endif .release = ep_eventpoll_release, .poll = ep_eventpoll_poll, .llseek = noop_llseek, |