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-rw-r--r--net/sunrpc/cache.c152
1 files changed, 93 insertions, 59 deletions
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 73f053d0cc7..636c8e04e0b 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -245,6 +245,7 @@ int cache_check(struct cache_detail *detail,
cache_put(h, detail);
return rv;
}
+EXPORT_SYMBOL(cache_check);
/*
* caches need to be periodically cleaned.
@@ -290,44 +291,78 @@ static const struct file_operations cache_flush_operations;
static void do_cache_clean(struct work_struct *work);
static DECLARE_DELAYED_WORK(cache_cleaner, do_cache_clean);
-void cache_register(struct cache_detail *cd)
+static void remove_cache_proc_entries(struct cache_detail *cd)
{
- cd->proc_ent = proc_mkdir(cd->name, proc_net_rpc);
- if (cd->proc_ent) {
- struct proc_dir_entry *p;
- cd->proc_ent->owner = cd->owner;
- cd->channel_ent = cd->content_ent = NULL;
+ if (cd->proc_ent == NULL)
+ return;
+ if (cd->flush_ent)
+ remove_proc_entry("flush", cd->proc_ent);
+ if (cd->channel_ent)
+ remove_proc_entry("channel", cd->proc_ent);
+ if (cd->content_ent)
+ remove_proc_entry("content", cd->proc_ent);
+ cd->proc_ent = NULL;
+ remove_proc_entry(cd->name, proc_net_rpc);
+}
- p = create_proc_entry("flush", S_IFREG|S_IRUSR|S_IWUSR,
- cd->proc_ent);
- cd->flush_ent = p;
- if (p) {
- p->proc_fops = &cache_flush_operations;
- p->owner = cd->owner;
- p->data = cd;
- }
+#ifdef CONFIG_PROC_FS
+static int create_cache_proc_entries(struct cache_detail *cd)
+{
+ struct proc_dir_entry *p;
- if (cd->cache_request || cd->cache_parse) {
- p = create_proc_entry("channel", S_IFREG|S_IRUSR|S_IWUSR,
- cd->proc_ent);
- cd->channel_ent = p;
- if (p) {
- p->proc_fops = &cache_file_operations;
- p->owner = cd->owner;
- p->data = cd;
- }
- }
- if (cd->cache_show) {
- p = create_proc_entry("content", S_IFREG|S_IRUSR|S_IWUSR,
- cd->proc_ent);
- cd->content_ent = p;
- if (p) {
- p->proc_fops = &content_file_operations;
- p->owner = cd->owner;
- p->data = cd;
- }
- }
+ cd->proc_ent = proc_mkdir(cd->name, proc_net_rpc);
+ if (cd->proc_ent == NULL)
+ goto out_nomem;
+ cd->proc_ent->owner = cd->owner;
+ cd->channel_ent = cd->content_ent = NULL;
+
+ p = create_proc_entry("flush", S_IFREG|S_IRUSR|S_IWUSR, cd->proc_ent);
+ cd->flush_ent = p;
+ if (p == NULL)
+ goto out_nomem;
+ p->proc_fops = &cache_flush_operations;
+ p->owner = cd->owner;
+ p->data = cd;
+
+ if (cd->cache_request || cd->cache_parse) {
+ p = create_proc_entry("channel", S_IFREG|S_IRUSR|S_IWUSR,
+ cd->proc_ent);
+ cd->channel_ent = p;
+ if (p == NULL)
+ goto out_nomem;
+ p->proc_fops = &cache_file_operations;
+ p->owner = cd->owner;
+ p->data = cd;
}
+ if (cd->cache_show) {
+ p = create_proc_entry("content", S_IFREG|S_IRUSR|S_IWUSR,
+ cd->proc_ent);
+ cd->content_ent = p;
+ if (p == NULL)
+ goto out_nomem;
+ p->proc_fops = &content_file_operations;
+ p->owner = cd->owner;
+ p->data = cd;
+ }
+ return 0;
+out_nomem:
+ remove_cache_proc_entries(cd);
+ return -ENOMEM;
+}
+#else /* CONFIG_PROC_FS */
+static int create_cache_proc_entries(struct cache_detail *cd)
+{
+ return 0;
+}
+#endif
+
+int cache_register(struct cache_detail *cd)
+{
+ int ret;
+
+ ret = create_cache_proc_entries(cd);
+ if (ret)
+ return ret;
rwlock_init(&cd->hash_lock);
INIT_LIST_HEAD(&cd->queue);
spin_lock(&cache_list_lock);
@@ -341,9 +376,11 @@ void cache_register(struct cache_detail *cd)
/* start the cleaning process */
schedule_delayed_work(&cache_cleaner, 0);
+ return 0;
}
+EXPORT_SYMBOL(cache_register);
-int cache_unregister(struct cache_detail *cd)
+void cache_unregister(struct cache_detail *cd)
{
cache_purge(cd);
spin_lock(&cache_list_lock);
@@ -351,30 +388,23 @@ int cache_unregister(struct cache_detail *cd)
if (cd->entries || atomic_read(&cd->inuse)) {
write_unlock(&cd->hash_lock);
spin_unlock(&cache_list_lock);
- return -EBUSY;
+ goto out;
}
if (current_detail == cd)
current_detail = NULL;
list_del_init(&cd->others);
write_unlock(&cd->hash_lock);
spin_unlock(&cache_list_lock);
- if (cd->proc_ent) {
- if (cd->flush_ent)
- remove_proc_entry("flush", cd->proc_ent);
- if (cd->channel_ent)
- remove_proc_entry("channel", cd->proc_ent);
- if (cd->content_ent)
- remove_proc_entry("content", cd->proc_ent);
-
- cd->proc_ent = NULL;
- remove_proc_entry(cd->name, proc_net_rpc);
- }
+ remove_cache_proc_entries(cd);
if (list_empty(&cache_list)) {
/* module must be being unloaded so its safe to kill the worker */
cancel_delayed_work_sync(&cache_cleaner);
}
- return 0;
+ return;
+out:
+ printk(KERN_ERR "nfsd: failed to unregister %s cache\n", cd->name);
}
+EXPORT_SYMBOL(cache_unregister);
/* clean cache tries to find something to clean
* and cleans it.
@@ -489,6 +519,7 @@ void cache_flush(void)
while (cache_clean() != -1)
cond_resched();
}
+EXPORT_SYMBOL(cache_flush);
void cache_purge(struct cache_detail *detail)
{
@@ -497,7 +528,7 @@ void cache_purge(struct cache_detail *detail)
cache_flush();
detail->flush_time = 1;
}
-
+EXPORT_SYMBOL(cache_purge);
/*
@@ -634,13 +665,13 @@ void cache_clean_deferred(void *owner)
/*
* communicate with user-space
*
- * We have a magic /proc file - /proc/sunrpc/cache
- * On read, you get a full request, or block
- * On write, an update request is processed
- * Poll works if anything to read, and always allows write
+ * We have a magic /proc file - /proc/sunrpc/<cachename>/channel.
+ * On read, you get a full request, or block.
+ * On write, an update request is processed.
+ * Poll works if anything to read, and always allows write.
*
* Implemented by linked list of requests. Each open file has
- * a ->private that also exists in this list. New request are added
+ * a ->private that also exists in this list. New requests are added
* to the end and may wakeup and preceding readers.
* New readers are added to the head. If, on read, an item is found with
* CACHE_UPCALLING clear, we free it from the list.
@@ -963,6 +994,7 @@ void qword_add(char **bpp, int *lp, char *str)
*bpp = bp;
*lp = len;
}
+EXPORT_SYMBOL(qword_add);
void qword_addhex(char **bpp, int *lp, char *buf, int blen)
{
@@ -991,6 +1023,7 @@ void qword_addhex(char **bpp, int *lp, char *buf, int blen)
*bpp = bp;
*lp = len;
}
+EXPORT_SYMBOL(qword_addhex);
static void warn_no_listener(struct cache_detail *detail)
{
@@ -1113,6 +1146,7 @@ int qword_get(char **bpp, char *dest, int bufsize)
*dest = '\0';
return len;
}
+EXPORT_SYMBOL(qword_get);
/*
@@ -1244,18 +1278,18 @@ static ssize_t read_flush(struct file *file, char __user *buf,
struct cache_detail *cd = PDE(file->f_path.dentry->d_inode)->data;
char tbuf[20];
unsigned long p = *ppos;
- int len;
+ size_t len;
sprintf(tbuf, "%lu\n", cd->flush_time);
len = strlen(tbuf);
if (p >= len)
return 0;
len -= p;
- if (len > count) len = count;
+ if (len > count)
+ len = count;
if (copy_to_user(buf, (void*)(tbuf+p), len))
- len = -EFAULT;
- else
- *ppos += len;
+ return -EFAULT;
+ *ppos += len;
return len;
}
generated by cgit v1.2.3-70-g09d2 (git 2.46.0) at 2024-12-25 05:00:28 +0000