diff options
Diffstat (limited to 'fs/seq_file.c')
| -rw-r--r-- | fs/seq_file.c | 36 |
1 files changed, 34 insertions, 2 deletions
diff --git a/fs/seq_file.c b/fs/seq_file.c index f8e1f4ee87ff..9456a2032224 100644 --- a/fs/seq_file.c +++ b/fs/seq_file.c @@ -554,9 +554,9 @@ int seq_dentry(struct seq_file *m, struct dentry *dentry, const char *esc) } EXPORT_SYMBOL(seq_dentry); -static void *single_start(struct seq_file *p, loff_t *pos) +void *single_start(struct seq_file *p, loff_t *pos) { - return NULL + (*pos == 0); + return *pos ? NULL : SEQ_START_TOKEN; } static void *single_next(struct seq_file *p, void *v, loff_t *pos) @@ -931,6 +931,38 @@ struct list_head *seq_list_next(void *v, struct list_head *head, loff_t *ppos) } EXPORT_SYMBOL(seq_list_next); +struct list_head *seq_list_start_rcu(struct list_head *head, loff_t pos) +{ + struct list_head *lh; + + list_for_each_rcu(lh, head) + if (pos-- == 0) + return lh; + + return NULL; +} +EXPORT_SYMBOL(seq_list_start_rcu); + +struct list_head *seq_list_start_head_rcu(struct list_head *head, loff_t pos) +{ + if (!pos) + return head; + + return seq_list_start_rcu(head, pos - 1); +} +EXPORT_SYMBOL(seq_list_start_head_rcu); + +struct list_head *seq_list_next_rcu(void *v, struct list_head *head, + loff_t *ppos) +{ + struct list_head *lh; + + lh = list_next_rcu((struct list_head *)v); + ++*ppos; + return lh == head ? NULL : lh; +} +EXPORT_SYMBOL(seq_list_next_rcu); + /** * seq_hlist_start - start an iteration of a hlist * @head: the head of the hlist |