SUNRPC: Move procfs-specific stuff out of the generic sunrpc cache code

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>

1 files changed, 190 insertions, 129 deletions

diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index e438352bed7b..1cd82eda56d0 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -291,69 +291,9 @@ static DEFINE_SPINLOCK(cache_list_lock);
 static struct cache_detail *current_detail;
 static int current_index;
 
-static const struct file_operations cache_file_operations;
-static const struct file_operations content_file_operations;
-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);
 
-static void remove_cache_proc_entries(struct cache_detail *cd)
-{
-        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);
-}
-
-#ifdef CONFIG_PROC_FS
-static int create_cache_proc_entries(struct cache_detail *cd)
-{
-        struct proc_dir_entry *p;
-
-        cd->proc_ent = proc_mkdir(cd->name, proc_net_rpc);
-        if (cd->proc_ent == NULL)
-                goto out_nomem;
-        cd->channel_ent = cd->content_ent = NULL;
-
-        p = proc_create_data("flush", S_IFREG|S_IRUSR|S_IWUSR,
-                             cd->proc_ent, &cache_flush_operations, cd);
-        cd->flush_ent = p;
-        if (p == NULL)
-                goto out_nomem;
-
-        if (cd->cache_upcall || cd->cache_parse) {
-                p = proc_create_data("channel", S_IFREG|S_IRUSR|S_IWUSR,
-                                     cd->proc_ent, &cache_file_operations, cd);
-                cd->channel_ent = p;
-                if (p == NULL)
-                        goto out_nomem;
-        }
-        if (cd->cache_show) {
-                p = proc_create_data("content", S_IFREG|S_IRUSR|S_IWUSR,
-                                cd->proc_ent, &content_file_operations, cd);
-                cd->content_ent = p;
-                if (p == NULL)
-                        goto out_nomem;
-        }
-        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
-
 static void sunrpc_init_cache_detail(struct cache_detail *cd)
 {
         rwlock_init(&cd->hash_lock);
@@ -395,25 +335,6 @@ out:
         printk(KERN_ERR "nfsd: failed to unregister %s cache\n", cd->name);
 }
 
-int cache_register(struct cache_detail *cd)
-{
-        int ret;
-
-        sunrpc_init_cache_detail(cd);
-        ret = create_cache_proc_entries(cd);
-        if (ret)
-                sunrpc_destroy_cache_detail(cd);
-        return ret;
-}
-EXPORT_SYMBOL_GPL(cache_register);
-
-void cache_unregister(struct cache_detail *cd)
-{
-        remove_cache_proc_entries(cd);
-        sunrpc_destroy_cache_detail(cd);
-}
-EXPORT_SYMBOL_GPL(cache_unregister);
-
 /* clean cache tries to find something to clean
  * and cleans it.
  * It returns 1 if it cleaned something,
@@ -704,13 +625,12 @@ struct cache_reader {
         int                     offset; /* if non-0, we have a refcnt on next request */
 };
 
-static ssize_t
-cache_read(struct file *filp, char __user *buf, size_t count, loff_t *ppos)
+static ssize_t cache_read(struct file *filp, char __user *buf, size_t count,
+                          loff_t *ppos, struct cache_detail *cd)
 {
         struct cache_reader *rp = filp->private_data;
         struct cache_request *rq;
         struct inode *inode = filp->f_path.dentry->d_inode;
-        struct cache_detail *cd = PDE(inode)->data;
         int err;
 
         if (count == 0)
@@ -834,13 +754,12 @@ out_slow:
         return cache_slow_downcall(buf, count, cd);
 }
 
-static ssize_t
-cache_write(struct file *filp, const char __user *buf, size_t count,
-            loff_t *ppos)
+static ssize_t cache_write(struct file *filp, const char __user *buf,
+                           size_t count, loff_t *ppos,
+                           struct cache_detail *cd)
 {
         struct address_space *mapping = filp->f_mapping;
         struct inode *inode = filp->f_path.dentry->d_inode;
-        struct cache_detail *cd = PDE(inode)->data;
         ssize_t ret = -EINVAL;
 
         if (!cd->cache_parse)
@@ -855,13 +774,12 @@ out:
 
 static DECLARE_WAIT_QUEUE_HEAD(queue_wait);
 
-static unsigned int
-cache_poll(struct file *filp, poll_table *wait)
+static unsigned int cache_poll(struct file *filp, poll_table *wait,
+                               struct cache_detail *cd)
 {
         unsigned int mask;
         struct cache_reader *rp = filp->private_data;
         struct cache_queue *cq;
-        struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data;
 
         poll_wait(filp, &queue_wait, wait);
 
@@ -883,14 +801,13 @@ cache_poll(struct file *filp, poll_table *wait)
         return mask;
 }
 
-static int
-cache_ioctl(struct inode *ino, struct file *filp,
-            unsigned int cmd, unsigned long arg)
+static int cache_ioctl(struct inode *ino, struct file *filp,
+                       unsigned int cmd, unsigned long arg,
+                       struct cache_detail *cd)
 {
         int len = 0;
         struct cache_reader *rp = filp->private_data;
         struct cache_queue *cq;
-        struct cache_detail *cd = PDE(ino)->data;
 
         if (cmd != FIONREAD || !rp)
                 return -EINVAL;
@@ -913,15 +830,13 @@ cache_ioctl(struct inode *ino, struct file *filp,
         return put_user(len, (int __user *)arg);
 }
 
-static int
-cache_open(struct inode *inode, struct file *filp)
+static int cache_open(struct inode *inode, struct file *filp,
+                      struct cache_detail *cd)
 {
         struct cache_reader *rp = NULL;
 
         nonseekable_open(inode, filp);
         if (filp->f_mode & FMODE_READ) {
-                struct cache_detail *cd = PDE(inode)->data;
-
                 rp = kmalloc(sizeof(*rp), GFP_KERNEL);
                 if (!rp)
                         return -ENOMEM;
@@ -936,11 +851,10 @@ cache_open(struct inode *inode, struct file *filp)
         return 0;
 }
 
-static int
-cache_release(struct inode *inode, struct file *filp)
+static int cache_release(struct inode *inode, struct file *filp,
+                         struct cache_detail *cd)
 {
         struct cache_reader *rp = filp->private_data;
-        struct cache_detail *cd = PDE(inode)->data;
 
         if (rp) {
                 spin_lock(&queue_lock);
@@ -969,18 +883,6 @@ cache_release(struct inode *inode, struct file *filp)
 
 
 
-static const struct file_operations cache_file_operations = {
-        .owner          = THIS_MODULE,
-        .llseek         = no_llseek,
-        .read           = cache_read,
-        .write          = cache_write,
-        .poll           = cache_poll,
-        .ioctl          = cache_ioctl, /* for FIONREAD */
-        .open           = cache_open,
-        .release        = cache_release,
-};
-
-
 static void queue_loose(struct cache_detail *detail, struct cache_head *ch)
 {
         struct cache_queue *cq;
@@ -1307,10 +1209,10 @@ static const struct seq_operations cache_content_op = {
         .show   = c_show,
 };
 
-static int content_open(struct inode *inode, struct file *file)
+static int content_open(struct inode *inode, struct file *file,
+                        struct cache_detail *cd)
 {
         struct handle *han;
-        struct cache_detail *cd = PDE(inode)->data;
 
         han = __seq_open_private(file, &cache_content_op, sizeof(*han));
         if (han == NULL)
@@ -1320,17 +1222,10 @@ static int content_open(struct inode *inode, struct file *file)
         return 0;
 }
 
-static const struct file_operations content_file_operations = {
-        .open           = content_open,
-        .read           = seq_read,
-        .llseek         = seq_lseek,
-        .release        = seq_release_private,
-};
-
 static ssize_t read_flush(struct file *file, char __user *buf,
-                            size_t count, loff_t *ppos)
+                          size_t count, loff_t *ppos,
+                          struct cache_detail *cd)
 {
-        struct cache_detail *cd = PDE(file->f_path.dentry->d_inode)->data;
         char tbuf[20];
         unsigned long p = *ppos;
         size_t len;
@@ -1348,10 +1243,10 @@ static ssize_t read_flush(struct file *file, char __user *buf,
         return len;
 }
 
-static ssize_t write_flush(struct file * file, const char __user * buf,
-                             size_t count, loff_t *ppos)
+static ssize_t write_flush(struct file *file, const char __user *buf,
+                           size_t count, loff_t *ppos,
+                           struct cache_detail *cd)
 {
-        struct cache_detail *cd = PDE(file->f_path.dentry->d_inode)->data;
         char tbuf[20];
         char *ep;
         long flushtime;
@@ -1372,8 +1267,174 @@ static ssize_t write_flush(struct file * file, const char __user * buf,
         return count;
 }
 
-static const struct file_operations cache_flush_operations = {
+static ssize_t cache_read_procfs(struct file *filp, char __user *buf,
+                                 size_t count, loff_t *ppos)
+{
+        struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data;
+
+        return cache_read(filp, buf, count, ppos, cd);
+}
+
+static ssize_t cache_write_procfs(struct file *filp, const char __user *buf,
+                                  size_t count, loff_t *ppos)
+{
+        struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data;
+
+        return cache_write(filp, buf, count, ppos, cd);
+}
+
+static unsigned int cache_poll_procfs(struct file *filp, poll_table *wait)
+{
+        struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data;
+
+        return cache_poll(filp, wait, cd);
+}
+
+static int cache_ioctl_procfs(struct inode *inode, struct file *filp,
+                              unsigned int cmd, unsigned long arg)
+{
+        struct cache_detail *cd = PDE(inode)->data;
+
+        return cache_ioctl(inode, filp, cmd, arg, cd);
+}
+
+static int cache_open_procfs(struct inode *inode, struct file *filp)
+{
+        struct cache_detail *cd = PDE(inode)->data;
+
+        return cache_open(inode, filp, cd);
+}
+
+static int cache_release_procfs(struct inode *inode, struct file *filp)
+{
+        struct cache_detail *cd = PDE(inode)->data;
+
+        return cache_release(inode, filp, cd);
+}
+
+static const struct file_operations cache_file_operations_procfs = {
+        .owner          = THIS_MODULE,
+        .llseek         = no_llseek,
+        .read           = cache_read_procfs,
+        .write          = cache_write_procfs,
+        .poll           = cache_poll_procfs,
+        .ioctl          = cache_ioctl_procfs, /* for FIONREAD */
+        .open           = cache_open_procfs,
+        .release        = cache_release_procfs,
+};
+
+static int content_open_procfs(struct inode *inode, struct file *filp)
+{
+        struct cache_detail *cd = PDE(inode)->data;
+
+        return content_open(inode, filp, cd);
+}
+
+static const struct file_operations content_file_operations_procfs = {
+        .open           = content_open_procfs,
+        .read           = seq_read,
+        .llseek         = seq_lseek,
+        .release        = seq_release_private,
+};
+
+static ssize_t read_flush_procfs(struct file *filp, char __user *buf,
+                            size_t count, loff_t *ppos)
+{
+        struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data;
+
+        return read_flush(filp, buf, count, ppos, cd);
+}
+
+static ssize_t write_flush_procfs(struct file *filp,
+                                  const char __user *buf,
+                                  size_t count, loff_t *ppos)
+{
+        struct cache_detail *cd = PDE(filp->f_path.dentry->d_inode)->data;
+
+        return write_flush(filp, buf, count, ppos, cd);
+}
+
+static const struct file_operations cache_flush_operations_procfs = {
         .open           = nonseekable_open,
-        .read           = read_flush,
-        .write          = write_flush,
+        .read           = read_flush_procfs,
+        .write          = write_flush_procfs,
 };
+
+static void remove_cache_proc_entries(struct cache_detail *cd)
+{
+        if (cd->u.procfs.proc_ent == NULL)
+                return;
+        if (cd->u.procfs.flush_ent)
+                remove_proc_entry("flush", cd->u.procfs.proc_ent);
+        if (cd->u.procfs.channel_ent)
+                remove_proc_entry("channel", cd->u.procfs.proc_ent);
+        if (cd->u.procfs.content_ent)
+                remove_proc_entry("content", cd->u.procfs.proc_ent);
+        cd->u.procfs.proc_ent = NULL;
+        remove_proc_entry(cd->name, proc_net_rpc);
+}
+
+#ifdef CONFIG_PROC_FS
+static int create_cache_proc_entries(struct cache_detail *cd)
+{
+        struct proc_dir_entry *p;
+
+        cd->u.procfs.proc_ent = proc_mkdir(cd->name, proc_net_rpc);
+        if (cd->u.procfs.proc_ent == NULL)
+                goto out_nomem;
+        cd->u.procfs.channel_ent = NULL;
+        cd->u.procfs.content_ent = NULL;
+
+        p = proc_create_data("flush", S_IFREG|S_IRUSR|S_IWUSR,
+                             cd->u.procfs.proc_ent,
+                             &cache_flush_operations_procfs, cd);
+        cd->u.procfs.flush_ent = p;
+        if (p == NULL)
+                goto out_nomem;
+
+        if (cd->cache_upcall || cd->cache_parse) {
+                p = proc_create_data("channel", S_IFREG|S_IRUSR|S_IWUSR,
+                                     cd->u.procfs.proc_ent,
+                                     &cache_file_operations_procfs, cd);
+                cd->u.procfs.channel_ent = p;
+                if (p == NULL)
+                        goto out_nomem;
+        }
+        if (cd->cache_show) {
+                p = proc_create_data("content", S_IFREG|S_IRUSR|S_IWUSR,
+                                cd->u.procfs.proc_ent,
+                                &content_file_operations_procfs, cd);
+                cd->u.procfs.content_ent = p;
+                if (p == NULL)
+                        goto out_nomem;
+        }
+        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;
+
+        sunrpc_init_cache_detail(cd);
+        ret = create_cache_proc_entries(cd);
+        if (ret)
+                sunrpc_destroy_cache_detail(cd);
+        return ret;
+}
+EXPORT_SYMBOL_GPL(cache_register);
+
+void cache_unregister(struct cache_detail *cd)
+{
+        remove_cache_proc_entries(cd);
+        sunrpc_destroy_cache_detail(cd);
+}
+EXPORT_SYMBOL_GPL(cache_unregister);