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Diffstat (limited to 'fs/gfs2/glock.c')
-rw-r--r--fs/gfs2/glock.c149
1 files changed, 149 insertions, 0 deletions
diff --git a/fs/gfs2/glock.c b/fs/gfs2/glock.c
index c992d53013d3..85352126e662 100644
--- a/fs/gfs2/glock.c
+++ b/fs/gfs2/glock.c
@@ -33,6 +33,9 @@
#include <linux/list_sort.h>
#include <linux/lockref.h>
#include <linux/rhashtable.h>
+#include <linux/pid_namespace.h>
+#include <linux/fdtable.h>
+#include <linux/file.h>
#include "gfs2.h"
#include "incore.h"
@@ -2745,6 +2748,149 @@ static const struct file_operations gfs2_glstats_fops = {
.release = gfs2_glocks_release,
};
+struct gfs2_glockfd_iter {
+ struct super_block *sb;
+ unsigned int tgid;
+ struct task_struct *task;
+ unsigned int fd;
+ struct file *file;
+};
+
+static struct task_struct *gfs2_glockfd_next_task(struct gfs2_glockfd_iter *i)
+{
+ struct pid_namespace *ns = task_active_pid_ns(current);
+ struct pid *pid;
+
+ if (i->task)
+ put_task_struct(i->task);
+
+ rcu_read_lock();
+retry:
+ i->task = NULL;
+ pid = find_ge_pid(i->tgid, ns);
+ if (pid) {
+ i->tgid = pid_nr_ns(pid, ns);
+ i->task = pid_task(pid, PIDTYPE_TGID);
+ if (!i->task) {
+ i->tgid++;
+ goto retry;
+ }
+ get_task_struct(i->task);
+ }
+ rcu_read_unlock();
+ return i->task;
+}
+
+static struct file *gfs2_glockfd_next_file(struct gfs2_glockfd_iter *i)
+{
+ if (i->file) {
+ fput(i->file);
+ i->file = NULL;
+ }
+
+ rcu_read_lock();
+ for(;; i->fd++) {
+ struct inode *inode;
+
+ i->file = task_lookup_next_fd_rcu(i->task, &i->fd);
+ if (!i->file) {
+ i->fd = 0;
+ break;
+ }
+ inode = file_inode(i->file);
+ if (inode->i_sb != i->sb)
+ continue;
+ if (get_file_rcu(i->file))
+ break;
+ }
+ rcu_read_unlock();
+ return i->file;
+}
+
+static void *gfs2_glockfd_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ struct gfs2_glockfd_iter *i = seq->private;
+
+ if (*pos)
+ return NULL;
+ while (gfs2_glockfd_next_task(i)) {
+ if (gfs2_glockfd_next_file(i))
+ return i;
+ i->tgid++;
+ }
+ return NULL;
+}
+
+static void *gfs2_glockfd_seq_next(struct seq_file *seq, void *iter_ptr,
+ loff_t *pos)
+{
+ struct gfs2_glockfd_iter *i = seq->private;
+
+ (*pos)++;
+ i->fd++;
+ do {
+ if (gfs2_glockfd_next_file(i))
+ return i;
+ i->tgid++;
+ } while (gfs2_glockfd_next_task(i));
+ return NULL;
+}
+
+static void gfs2_glockfd_seq_stop(struct seq_file *seq, void *iter_ptr)
+{
+ struct gfs2_glockfd_iter *i = seq->private;
+
+ if (i->file)
+ fput(i->file);
+ if (i->task)
+ put_task_struct(i->task);
+}
+
+static int gfs2_glockfd_seq_show(struct seq_file *seq, void *iter_ptr)
+{
+ struct gfs2_glockfd_iter *i = seq->private;
+ struct inode *inode = file_inode(i->file);
+ struct gfs2_glock *gl;
+
+ inode_lock_shared(inode);
+ gl = GFS2_I(inode)->i_iopen_gh.gh_gl;
+ if (gl) {
+ seq_printf(seq, "%d %u %u/%llx\n",
+ i->tgid, i->fd, gl->gl_name.ln_type,
+ (unsigned long long)gl->gl_name.ln_number);
+ }
+ inode_unlock_shared(inode);
+ return 0;
+}
+
+static const struct seq_operations gfs2_glockfd_seq_ops = {
+ .start = gfs2_glockfd_seq_start,
+ .next = gfs2_glockfd_seq_next,
+ .stop = gfs2_glockfd_seq_stop,
+ .show = gfs2_glockfd_seq_show,
+};
+
+static int gfs2_glockfd_open(struct inode *inode, struct file *file)
+{
+ struct gfs2_glockfd_iter *i;
+ struct gfs2_sbd *sdp = inode->i_private;
+
+ i = __seq_open_private(file, &gfs2_glockfd_seq_ops,
+ sizeof(struct gfs2_glockfd_iter));
+ if (!i)
+ return -ENOMEM;
+ i->sb = sdp->sd_vfs;
+ return 0;
+}
+
+static const struct file_operations gfs2_glockfd_fops = {
+ .owner = THIS_MODULE,
+ .open = gfs2_glockfd_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release_private,
+};
+
DEFINE_SEQ_ATTRIBUTE(gfs2_sbstats);
void gfs2_create_debugfs_file(struct gfs2_sbd *sdp)
@@ -2754,6 +2900,9 @@ void gfs2_create_debugfs_file(struct gfs2_sbd *sdp)
debugfs_create_file("glocks", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp,
&gfs2_glocks_fops);
+ debugfs_create_file("glockfd", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp,
+ &gfs2_glockfd_fops);
+
debugfs_create_file("glstats", S_IFREG | S_IRUGO, sdp->debugfs_dir, sdp,
&gfs2_glstats_fops);