On Tue, 19 Nov 2013, Al Viro wrote:
>
> seq_file: always clear m->count when we free m->buf
Ok, applied.
What do you think about then just abstracing out that now common sequence
of re-allocating a larger buffer, while clearing m->count?
IOW, something like the appended..
Linus
---
fs/seq_file.c | 18 ++++++++++--------
1 file changed, 10 insertions(+), 8 deletions(-)
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 1d641bb108d2..f513e1efa49d 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -82,6 +82,14 @@ int seq_open(struct file *file, const struct seq_operations *op)
}
EXPORT_SYMBOL(seq_open);
+static int grow_seq_buf(struct seq_file *m)
+{
+ kfree(m->buf);
+ m->count = 0;
+ m->buf = kmalloc(m->size <<= 1, GFP_KERNEL);
+ return m->buf != NULL;
+}
+
static int traverse(struct seq_file *m, loff_t offset)
{
loff_t pos = 0, index;
@@ -135,10 +143,7 @@ static int traverse(struct seq_file *m, loff_t offset)
Eoverflow:
m->op->stop(m, p);
- kfree(m->buf);
- m->count = 0;
- m->buf = kmalloc(m->size <<= 1, GFP_KERNEL);
- return !m->buf ? -ENOMEM : -EAGAIN;
+ return grow_seq_buf(m) ? -EAGAIN : -ENOMEM;
}
/**
@@ -232,10 +237,7 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
if (m->count < m->size)
goto Fill;
m->op->stop(m, p);
- kfree(m->buf);
- m->count = 0;
- m->buf = kmalloc(m->size <<= 1, GFP_KERNEL);
- if (!m->buf)
+ if (!grow_seq_buf(m))
goto Enomem;
m->version = 0;
pos = m->index;
--
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