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Groups > linux.kernel > #1351660
| From | David Howells <dhowells@redhat.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 02/11] rxrpc: Do procfs lists through objcache |
| Date | 2016-03-07 15:50 +0100 |
| Message-ID | <ra4DU-46c-9@gated-at.bofh.it> (permalink) |
| References | <ra4ue-42s-17@gated-at.bofh.it> |
| Organization | Red Hat UK Ltd. Registered Address: Red Hat UK Ltd, Amberley Place, 107-111 Peascod Street, Windsor, Berkshire, SI4 1TE, United Kingdom. Registered in England and Wales under Company Registration No. 3798903 |
Use the object cache primary hash to provide lists of RxRPC objects through
/proc/net/ for all caches where desired. Each user of the cache just needs
to provide a show function in its objcache struct and register the proc
file with objcache_seq_fops as its file operations.
Signed-off-by: David Howells <dhowells@redhat.com>
---
net/rxrpc/objcache.c | 104 ++++++++++++++++++++++++++++++++++++++++++++++++++
net/rxrpc/objcache.h | 8 ++++
2 files changed, 112 insertions(+)
diff --git a/net/rxrpc/objcache.c b/net/rxrpc/objcache.c
index 74eed8ce5894..e74f8c3c4119 100644
--- a/net/rxrpc/objcache.c
+++ b/net/rxrpc/objcache.c
@@ -11,6 +11,8 @@
#include <linux/sched.h>
#include <linux/hash.h>
+#include <linux/proc_fs.h>
+#include <linux/seq_file.h>
#include "ar-internal.h"
#include "objcache.h"
@@ -475,3 +477,105 @@ void objcache_clear(struct objcache *cache)
_leave("");
}
+
+/*
+ * Generate a list of cached objects in /proc/net/x
+ */
+static void *objcache_seq_start(struct seq_file *seq, loff_t *_pos)
+ __acquires(rcu)
+{
+ struct objcache *cache = seq->private;
+ struct hlist_head *hash;
+ loff_t pos_l = *_pos;
+ unsigned pos = pos_l, bucket;
+ void *ret;
+
+ if (*_pos > UINT_MAX)
+ return NULL;
+ bucket = pos >> 16;
+ pos &= 0xffff;
+
+ rcu_read_lock();
+
+ do {
+ hash = &cache->hash_table[bucket];
+ if (bucket == 0)
+ ret = seq_hlist_start_head(hash, pos);
+ else
+ ret = seq_hlist_start(hash, pos);
+ } while (!ret && (bucket++,
+ *_pos = bucket << 16,
+ bucket < cache->nr_buckets));
+
+ return ret;
+}
+
+static void *objcache_seq_next(struct seq_file *seq, void *v, loff_t *_pos)
+{
+ struct objcache *cache = seq->private;
+ struct hlist_head *hash;
+ unsigned bucket;
+ void *ret;
+
+ if (*_pos > UINT_MAX)
+ return NULL;
+ bucket = *_pos >> 16;
+ hash = &cache->hash_table[bucket];
+ ret = seq_hlist_next(v, hash, _pos);
+ if (ret)
+ return ret;
+
+ while (bucket++,
+ *_pos = bucket << 16,
+ bucket < cache->nr_buckets
+ ) {
+ hash = &cache->hash_table[bucket];
+ ret = seq_hlist_start(hash, 0);
+ if (ret)
+ break;
+ }
+ return ret;
+}
+
+static void objcache_seq_stop(struct seq_file *seq, void *v)
+ __releases(rcu)
+{
+ rcu_read_unlock();
+}
+
+static int objcache_seq_show(struct seq_file *seq, void *v)
+{
+ struct objcache *cache = seq->private;
+ struct obj_node *obj = v;
+
+ return cache->seq_show(seq, obj);
+}
+
+static const struct seq_operations objcache_seq_ops = {
+ .start = objcache_seq_start,
+ .next = objcache_seq_next,
+ .stop = objcache_seq_stop,
+ .show = objcache_seq_show,
+};
+
+static int objcache_seq_open(struct inode *inode, struct file *file)
+{
+ struct objcache *cache = PDE_DATA(inode);
+ struct seq_file *seq;
+ int ret;
+
+ ret = seq_open(file, &objcache_seq_ops);
+ if (ret == 0) {
+ seq = file->private_data;
+ seq->private = cache;
+ }
+ return ret;
+}
+
+const struct file_operations objcache_seq_fops = {
+ .owner = THIS_MODULE,
+ .open = objcache_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
diff --git a/net/rxrpc/objcache.h b/net/rxrpc/objcache.h
index 770ec924a6d2..a3799eb4c857 100644
--- a/net/rxrpc/objcache.h
+++ b/net/rxrpc/objcache.h
@@ -52,6 +52,11 @@ struct objcache {
unsigned long (*hash_key_2)(const void *);
int (*cmp_key_2)(const struct obj_node *, const void *);
+ /* If the cache should be visible through /proc, the following
+ * should be implemented.
+ */
+ int (*seq_show)(struct seq_file *, void *);
+
/* Internal data */
spinlock_t lock;
atomic_t count;
@@ -64,6 +69,7 @@ struct objcache {
time64_t gc_next_run;
unsigned gc_bucket;
unsigned gc_last_bucket;
+ struct seq_operations seq_ops;
};
static inline bool objcache_get_maybe(struct obj_node *obj)
@@ -86,4 +92,6 @@ extern void objcache_put(struct objcache *, struct obj_node *);
extern void objcache_obj_rcu_done(struct objcache *);
extern void objcache_clear(struct objcache *);
+extern const struct file_operations objcache_seq_fops;
+
#endif /* _OBJCACHE_H */
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[PATCH 00/11] RxRPC: Rewrite part 2 David Howells <dhowells@redhat.com> - 2016-03-07 15:40 +0100
[PATCH 11/11] rxrpc: Rename rxrpc_UDP_error_report() to rxrpc_error_report() David Howells <dhowells@redhat.com> - 2016-03-07 15:40 +0100
[PATCH 07/11] rxrpc: Rename ar-peer.c to peer-object.c David Howells <dhowells@redhat.com> - 2016-03-07 15:40 +0100
[PATCH 05/11] rxrpc: procfs file to list local endpoints David Howells <dhowells@redhat.com> - 2016-03-07 15:40 +0100
[PATCH 02/11] rxrpc: Do procfs lists through objcache David Howells <dhowells@redhat.com> - 2016-03-07 15:50 +0100
[PATCH 09/11] rxrpc: Add /proc/net/rxrpc_peers to display the known remote endpoints David Howells <dhowells@redhat.com> - 2016-03-07 15:50 +0100
[PATCH 06/11] rxrpc: Rename ar-local.c to local-event.c David Howells <dhowells@redhat.com> - 2016-03-07 15:50 +0100
[PATCH 10/11] rxrpc: Rename ar-error.c to peer-event.c David Howells <dhowells@redhat.com> - 2016-03-07 15:50 +0100
[PATCH 01/11] rxrpc: Add a common object cache David Howells <dhowells@redhat.com> - 2016-03-07 15:50 +0100
Re: [PATCH 01/11] rxrpc: Add a common object cache David Miller <davem@davemloft.net> - 2016-03-07 19:50 +0100
Re: [PATCH 01/11] rxrpc: Add a common object cache David Howells <dhowells@redhat.com> - 2016-03-07 23:50 +0100
Re: [PATCH 01/11] rxrpc: Add a common object cache David Miller <davem@davemloft.net> - 2016-03-08 05:10 +0100
Re: [PATCH 01/11] rxrpc: Add a common object cache David Howells <dhowells@redhat.com> - 2016-03-08 12:50 +0100
Re: [PATCH 01/11] rxrpc: Add a common object cache David Howells <dhowells@redhat.com> - 2016-03-08 14:10 +0100
Re: [PATCH 01/11] rxrpc: Add a common object cache David Miller <davem@davemloft.net> - 2016-03-08 21:20 +0100
Re: [PATCH 01/11] rxrpc: Add a common object cache David Miller <davem@davemloft.net> - 2016-03-08 21:20 +0100
Re: [PATCH 01/11] rxrpc: Add a common object cache David Howells <dhowells@redhat.com> - 2016-03-08 22:20 +0100
Re: [PATCH 01/11] rxrpc: Add a common object cache David Miller <davem@davemloft.net> - 2016-03-09 04:10 +0100
[PATCH 04/11] rxrpc: Implement local endpoint cache David Howells <dhowells@redhat.com> - 2016-03-07 15:50 +0100
[PATCH 03/11] rxrpc: Separate local endpoint object handling out into its own file David Howells <dhowells@redhat.com> - 2016-03-07 15:50 +0100
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