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| author | KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> | 2009-04-09 13:57:59 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@suse.de> | 2009-04-16 16:17:10 -0700 |
| commit | 31b07093c44a7a442394d44423e21d783f5523b8 (patch) | |
| tree | 8569f8450dd2e7560a36a751faeee8d402c031ca | |
| parent | 1af3557abdef34ee036a6de4cb79e24468544b8d (diff) | |
| download | linux-31b07093c44a7a442394d44423e21d783f5523b8.tar.gz | |
proc: mounts_poll() make consistent to mdstat_poll
In recently sysfs_poll discussion, Neil Brown pointed out /proc/mounts also should be fixed. SUSv3 says "Regular files shall always poll TRUE for reading and writing". see http://www.opengroup.org/onlinepubs/009695399/functions/poll.html Then, mounts_poll()'s default should be "POLLIN | POLLRDNORM". it mean always readable. In addition, event trigger should use "POLLERR | POLLPRI" instead POLLERR. it makes consistent to mdstat_poll() and sysfs_poll(). and, select(2) can handle POLLPRI easily. Reported-by: Neil Brown <neilb@suse.de> Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com> Cc: Ram Pai <linuxram@us.ibm.com> Cc: Miklos Szeredi <mszeredi@suse.cz> Cc: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
| -rw-r--r-- | fs/proc/base.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/proc/base.c b/fs/proc/base.c index f71559784bfb..aa763ab00777 100644 --- a/fs/proc/base.c +++ b/fs/proc/base.c @@ -648,14 +648,14 @@ static unsigned mounts_poll(struct file *file, poll_table *wait) { struct proc_mounts *p = file->private_data; struct mnt_namespace *ns = p->ns; - unsigned res = 0; + unsigned res = POLLIN | POLLRDNORM; poll_wait(file, &ns->poll, wait); spin_lock(&vfsmount_lock); if (p->event != ns->event) { p->event = ns->event; - res = POLLERR; + res |= POLLERR | POLLPRI; } spin_unlock(&vfsmount_lock); |