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Subject[PATCH 2/8] 2.6.0-test2-bk8 - seq_file conversion of /proc/net/atm (vc helpers)
Helpers for seq_file conversion of proc/atm/{pvc/svc/vc}:
- struct atm_vc_state keeps
1) the struct sock from which the current struct atm_vcc is deduced
2) the family to which must belong the vcc (PF_ATM{SVC/PVC/any})
3) the availability of clip module
- atm_vc_common_seq_{start/stop} are responsible for vcc_sklist locking
- atm_vc_common_seq_{open/release} take care of get/put for the clip module.


net/atm/proc.c | 100 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
1 files changed, 100 insertions(+)

diff -puN net/atm/proc.c~atm-proc-seq-vc-utils net/atm/proc.c
--- linux-2.6.0-test2-bk8/net/atm/proc.c~atm-proc-seq-vc-utils Fri Aug 8 20:29:03 2003
+++ linux-2.6.0-test2-bk8-fr/net/atm/proc.c Fri Aug 8 20:29:17 2003
@@ -161,6 +161,106 @@ static void atmarp_info(struct net_devic

#endif

+struct atm_vc_state {
+ struct sock *sk;
+ int family;
+ int clip_info;
+};
+
+static inline int compare_family(struct sock *sk, int family)
+{
+ struct atm_vcc *vcc = atm_sk(sk);
+
+ return !family || (vcc->sk->sk_family == family);
+}
+
+static int __atm_vc_common_walk(struct sock **sock, int family, loff_t l)
+{
+ struct sock *sk = *sock;
+
+ if (sk == (void *)1) {
+ sk = hlist_empty(&vcc_sklist) ? NULL : __sk_head(&vcc_sklist);
+ l--;
+ }
+ for (; sk; sk = sk_next(sk)) {
+ l -= compare_family(sk, family);
+ if (l < 0)
+ goto out;
+ }
+ sk = (void *)1;
+out:
+ *sock = sk;
+ return (l < 0);
+}
+
+static void *atm_vc_common_walk(struct atm_vc_state *state, loff_t l)
+{
+ return __atm_vc_common_walk(&state->sk, state->family, l) ?
+ state : NULL;
+}
+
+static int atm_vc_common_seq_open(struct inode *inode, struct file *file,
+ int family, struct seq_operations *ops)
+{
+ struct atm_vc_state *state;
+ struct seq_file *seq;
+ int rc = -ENOMEM;
+
+ state = kmalloc(sizeof(*state), GFP_KERNEL);
+ if (!state)
+ goto out;
+
+ rc = seq_open(file, ops);
+ if (rc)
+ goto out_kfree;
+
+ state->family = family;
+ state->clip_info = try_atm_clip_ops();
+
+ seq = file->private_data;
+ seq->private = state;
+out:
+ return rc;
+out_kfree:
+ kfree(state);
+ goto out;
+}
+
+static int atm_vc_common_seq_release(struct inode *inode, struct file *file)
+{
+#if defined(CONFIG_ATM_CLIP) || defined(CONFIG_ATM_CLIP_MODULE)
+ struct seq_file *seq = file->private_data;
+ struct atm_vc_state *state = seq->private;
+
+ if (state->clip_info)
+ module_put(atm_clip_ops->owner);
+#endif
+ return seq_release_private(inode, file);
+}
+
+static void *atm_vc_common_seq_start(struct seq_file *seq, loff_t *pos)
+{
+ struct atm_vc_state *state = seq->private;
+ loff_t left = *pos;
+
+ read_lock(&vcc_sklist_lock);
+ state->sk = (void *)1;
+ return left ? atm_vc_common_walk(state, left) : (void *)1;
+}
+
+static void atm_vc_common_seq_stop(struct seq_file *seq, void *v)
+{
+ read_unlock(&vcc_sklist_lock);
+}
+
+static void *atm_vc_common_seq_next(struct seq_file *seq, void *v, loff_t *pos)
+{
+ struct atm_vc_state *state = seq->private;
+
+ v = atm_vc_common_walk(state, 1);
+ *pos += !!PTR_ERR(v);
+ return v;
+}

static void pvc_info(struct atm_vcc *vcc, char *buf, int clip_info)
{
_
-
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