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-rw-r--r--fs/seq_file.c25
1 files changed, 23 insertions, 2 deletions
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 3f54dbd..bd20f7f 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -108,9 +108,9 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
goto Done;
}
/* we need at least one record in buffer */
+ pos = m->index;
+ p = m->op->start(m, &pos);
while (1) {
- pos = m->index;
- p = m->op->start(m, &pos);
err = PTR_ERR(p);
if (!p || IS_ERR(p))
break;
@@ -119,6 +119,11 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
break;
if (unlikely(err))
m->count = 0;
+ if (unlikely(!m->count)) {
+ p = m->op->next(m, p, &pos);
+ m->index = pos;
+ continue;
+ }
if (m->count < m->size)
goto Fill;
m->op->stop(m, p);
@@ -128,6 +133,8 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
goto Enomem;
m->count = 0;
m->version = 0;
+ pos = m->index;
+ p = m->op->start(m, &pos);
}
m->op->stop(m, p);
m->count = 0;
@@ -443,6 +450,20 @@ int seq_dentry(struct seq_file *m, struct dentry *dentry, char *esc)
return -1;
}
+int seq_bitmap(struct seq_file *m, unsigned long *bits, unsigned int nr_bits)
+{
+ size_t len = bitmap_scnprintf_len(nr_bits);
+
+ if (m->count + len < m->size) {
+ bitmap_scnprintf(m->buf + m->count, m->size - m->count,
+ bits, nr_bits);
+ m->count += len;
+ return 0;
+ }
+ m->count = m->size;
+ return -1;
+}
+
static void *single_start(struct seq_file *p, loff_t *pos)
{
return NULL + (*pos == 0);
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