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take check for new events in namespace (guts of mounts_poll()) to namespace.c

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2010-02-05 00:40:25 -05:00
parent e21e7095a7
commit 9f5596af44
3 changed files with 18 additions and 8 deletions
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15
fs/namespace.c
View File

@ -737,6 +737,21 @@ static void m_stop(struct seq_file *m, void *v)
up_read(&namespace_sem);
}
int mnt_had_events(struct proc_mounts *p)
{
struct mnt_namespace *ns = p->ns;
int res = 0;
spin_lock(&vfsmount_lock);
if (p->event != ns->event) {
p->event = ns->event;
res = 1;
}
spin_unlock(&vfsmount_lock);
return res;
}
struct proc_fs_info {
int flag;
const char *str;

10
fs/proc/base.c
View File

@ -647,17 +647,11 @@ static int mounts_release(struct inode *inode, struct file *file)
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 = POLLIN | POLLRDNORM;
poll_wait(file, &ns->poll, wait);
spin_lock(&vfsmount_lock);
if (p->event != ns->event) {
p->event = ns->event;
poll_wait(file, &p->ns->poll, wait);
if (mnt_had_events(p))
res |= POLLERR | POLLPRI;
}
spin_unlock(&vfsmount_lock);
return res;
}

1
include/linux/mnt_namespace.h
View File

@ -35,6 +35,7 @@ static inline void get_mnt_ns(struct mnt_namespace *ns)
extern const struct seq_operations mounts_op;
extern const struct seq_operations mountinfo_op;
extern const struct seq_operations mountstats_op;
extern int mnt_had_events(struct proc_mounts *);
#endif
#endif