diff options
author | Jeff Layton <jlayton@redhat.com> | 2013-06-21 08:58:21 -0400 |
---|---|---|
committer | Al Viro <viro@zeniv.linux.org.uk> | 2013-07-08 13:36:41 +0400 |
commit | 0bc77381c1b1600e659eb7322c39d1753615722d (patch) | |
tree | 6e2adc4932f0fc136d08da5ba5adb032970a1b05 /fs | |
parent | 99b072bb38c9b398bc7c3fc8a0f30d0801f78750 (diff) | |
download | op-kernel-dev-0bc77381c1b1600e659eb7322c39d1753615722d.zip op-kernel-dev-0bc77381c1b1600e659eb7322c39d1753615722d.tar.gz |
seq_file: add seq_list_*_percpu helpers
When we convert the file_lock_list to a set of percpu lists, we'll need
a way to iterate over them in order to output /proc/locks info. Add
some seq_list_*_percpu helpers to handle that.
Signed-off-by: Jeff Layton <jlayton@redhat.com>
Acked-by: J. Bruce Fields <bfields@fieldses.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/seq_file.c | 54 |
1 files changed, 54 insertions, 0 deletions
diff --git a/fs/seq_file.c b/fs/seq_file.c index 774c1eb..3135c25 100644 --- a/fs/seq_file.c +++ b/fs/seq_file.c @@ -921,3 +921,57 @@ struct hlist_node *seq_hlist_next_rcu(void *v, return rcu_dereference(node->next); } EXPORT_SYMBOL(seq_hlist_next_rcu); + +/** + * seq_hlist_start_precpu - start an iteration of a percpu hlist array + * @head: pointer to percpu array of struct hlist_heads + * @cpu: pointer to cpu "cursor" + * @pos: start position of sequence + * + * Called at seq_file->op->start(). + */ +struct hlist_node * +seq_hlist_start_percpu(struct hlist_head __percpu *head, int *cpu, loff_t pos) +{ + struct hlist_node *node; + + for_each_possible_cpu(*cpu) { + hlist_for_each(node, per_cpu_ptr(head, *cpu)) { + if (pos-- == 0) + return node; + } + } + return NULL; +} +EXPORT_SYMBOL(seq_hlist_start_percpu); + +/** + * seq_hlist_next_percpu - move to the next position of the percpu hlist array + * @v: pointer to current hlist_node + * @head: pointer to percpu array of struct hlist_heads + * @cpu: pointer to cpu "cursor" + * @pos: start position of sequence + * + * Called at seq_file->op->next(). + */ +struct hlist_node * +seq_hlist_next_percpu(void *v, struct hlist_head __percpu *head, + int *cpu, loff_t *pos) +{ + struct hlist_node *node = v; + + ++*pos; + + if (node->next) + return node->next; + + for (*cpu = cpumask_next(*cpu, cpu_possible_mask); *cpu < nr_cpu_ids; + *cpu = cpumask_next(*cpu, cpu_possible_mask)) { + struct hlist_head *bucket = per_cpu_ptr(head, *cpu); + + if (!hlist_empty(bucket)) + return bucket->first; + } + return NULL; +} +EXPORT_SYMBOL(seq_hlist_next_percpu); |