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-rw-r--r--fs/seq_file.c35
1 files changed, 5 insertions, 30 deletions
diff --git a/fs/seq_file.c b/fs/seq_file.c
index 1600034a929b..70f5fdf99bf6 100644
--- a/fs/seq_file.c
+++ b/fs/seq_file.c
@@ -68,13 +68,6 @@ int seq_open(struct file *file, const struct seq_operations *op)
p->file = file;
/*
- * Wrappers around seq_open(e.g. swaps_open) need to be
- * aware of this. If they set f_version themselves, they
- * should call seq_open first and then set f_version.
- */
- file->f_version = 0;
-
- /*
* seq_files support lseek() and pread(). They do not implement
* write() at all, but we clear FMODE_PWRITE here for historical
* reasons.
@@ -94,7 +87,6 @@ static int traverse(struct seq_file *m, loff_t offset)
int error = 0;
void *p;
- m->version = 0;
m->index = 0;
m->count = m->from = 0;
if (!offset)
@@ -161,25 +153,11 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
mutex_lock(&m->lock);
/*
- * seq_file->op->..m_start/m_stop/m_next may do special actions
- * or optimisations based on the file->f_version, so we want to
- * pass the file->f_version to those methods.
- *
- * seq_file->version is just copy of f_version, and seq_file
- * methods can treat it simply as file version.
- * It is copied in first and copied out after all operations.
- * It is convenient to have it as part of structure to avoid the
- * need of passing another argument to all the seq_file methods.
- */
- m->version = file->f_version;
-
- /*
* if request is to read from zero offset, reset iterator to first
* record as it might have been already advanced by previous requests
*/
if (*ppos == 0) {
m->index = 0;
- m->version = 0;
m->count = 0;
}
@@ -190,7 +168,6 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
if (err) {
/* With prejudice... */
m->read_pos = 0;
- m->version = 0;
m->index = 0;
m->count = 0;
goto Done;
@@ -243,7 +220,6 @@ ssize_t seq_read(struct file *file, char __user *buf, size_t size, loff_t *ppos)
m->buf = seq_buf_alloc(m->size <<= 1);
if (!m->buf)
goto Enomem;
- m->version = 0;
p = m->op->start(m, &m->index);
}
m->op->stop(m, p);
@@ -256,9 +232,12 @@ Fill:
loff_t pos = m->index;
p = m->op->next(m, p, &m->index);
- if (pos == m->index)
- /* Buggy ->next function */
+ if (pos == m->index) {
+ pr_info_ratelimited("buggy seq_file .next function %ps "
+ "did not updated position index\n",
+ m->op->next);
m->index++;
+ }
if (!p || IS_ERR(p)) {
err = PTR_ERR(p);
break;
@@ -287,7 +266,6 @@ Done:
*ppos += copied;
m->read_pos += copied;
}
- file->f_version = m->version;
mutex_unlock(&m->lock);
return copied;
Enomem:
@@ -313,7 +291,6 @@ loff_t seq_lseek(struct file *file, loff_t offset, int whence)
loff_t retval = -EINVAL;
mutex_lock(&m->lock);
- m->version = file->f_version;
switch (whence) {
case SEEK_CUR:
offset += file->f_pos;
@@ -329,7 +306,6 @@ loff_t seq_lseek(struct file *file, loff_t offset, int whence)
/* with extreme prejudice... */
file->f_pos = 0;
m->read_pos = 0;
- m->version = 0;
m->index = 0;
m->count = 0;
} else {
@@ -340,7 +316,6 @@ loff_t seq_lseek(struct file *file, loff_t offset, int whence)
file->f_pos = offset;
}
}
- file->f_version = m->version;
mutex_unlock(&m->lock);
return retval;
}