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-rw-r--r--fs/seq_file.c52
1 files changed, 45 insertions, 7 deletions
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 0ac22af7afe5..bbb19be260ce 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -177,21 +177,23 @@ EXPORT_SYMBOL(seq_read);
static int traverse(struct seq_file *m, loff_t offset)
{
- loff_t pos = 0;
+ loff_t pos = 0, index;
int error = 0;
void *p;
m->version = 0;
- m->index = 0;
+ index = 0;
m->count = m->from = 0;
- if (!offset)
+ if (!offset) {
+ m->index = index;
return 0;
+ }
if (!m->buf) {
m->buf = kmalloc(m->size = PAGE_SIZE, GFP_KERNEL);
if (!m->buf)
return -ENOMEM;
}
- p = m->op->start(m, &m->index);
+ p = m->op->start(m, &index);
while (p) {
error = PTR_ERR(p);
if (IS_ERR(p))
@@ -204,15 +206,17 @@ static int traverse(struct seq_file *m, loff_t offset)
if (pos + m->count > offset) {
m->from = offset - pos;
m->count -= m->from;
+ m->index = index;
break;
}
pos += m->count;
m->count = 0;
if (pos == offset) {
- m->index++;
+ index++;
+ m->index = index;
break;
}
- p = m->op->next(m, p, &m->index);
+ p = m->op->next(m, p, &index);
}
m->op->stop(m, p);
return error;
@@ -260,8 +264,8 @@ loff_t seq_lseek(struct file *file, loff_t offset, int origin)
}
}
}
- mutex_unlock(&m->lock);
file->f_version = m->version;
+ mutex_unlock(&m->lock);
return retval;
}
EXPORT_SYMBOL(seq_lseek);
@@ -447,3 +451,37 @@ int seq_puts(struct seq_file *m, const char *s)
return -1;
}
EXPORT_SYMBOL(seq_puts);
+
+struct list_head *seq_list_start(struct list_head *head, loff_t pos)
+{
+ struct list_head *lh;
+
+ list_for_each(lh, head)
+ if (pos-- == 0)
+ return lh;
+
+ return NULL;
+}
+
+EXPORT_SYMBOL(seq_list_start);
+
+struct list_head *seq_list_start_head(struct list_head *head, loff_t pos)
+{
+ if (!pos)
+ return head;
+
+ return seq_list_start(head, pos - 1);
+}
+
+EXPORT_SYMBOL(seq_list_start_head);
+
+struct list_head *seq_list_next(void *v, struct list_head *head, loff_t *ppos)
+{
+ struct list_head *lh;
+
+ lh = ((struct list_head *)v)->next;
+ ++*ppos;
+ return lh == head ? NULL : lh;
+}
+
+EXPORT_SYMBOL(seq_list_next);
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