fuse: add fusectl interface to max_background

Make the max_background and congestion_threshold parameters of a FUSE
mount tunable at runtime by adding the respective knobs to its directory
within the fusectl filesystem.

Signed-off-by: Csaba Henk <csaba@gluster.com>
Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>

diff --git a/fs/fuse/control.c b/fs/fuse/control.c
index 218d514..3773fd6 100644 (file)
--- a/fs/fuse/control.c
+++ b/fs/fuse/control.c
@@ -61,6 +61,121 @@ static ssize_t fuse_conn_waiting_read(struct file *file, char __user *buf,
        return simple_read_from_buffer(buf, len, ppos, tmp, size);
 }
 
+static ssize_t fuse_conn_limit_read(struct file *file, char __user *buf,
+                                   size_t len, loff_t *ppos, unsigned val)
+{
+       char tmp[32];
+       size_t size = sprintf(tmp, "%u\n", val);
+
+       return simple_read_from_buffer(buf, len, ppos, tmp, size);
+}
+
+static ssize_t fuse_conn_limit_write(struct file *file, const char __user *buf,
+                                    size_t count, loff_t *ppos, unsigned *val,
+                                    unsigned global_limit)
+{
+       unsigned long t;
+       char tmp[32];
+       unsigned limit = (1 << 16) - 1;
+       int err;
+
+       if (*ppos || count >= sizeof(tmp) - 1)
+               return -EINVAL;
+
+       if (copy_from_user(tmp, buf, count))
+               return -EINVAL;
+
+       tmp[count] = '\0';
+
+       err = strict_strtoul(tmp, 0, &t);
+       if (err)
+               return err;
+
+       if (!capable(CAP_SYS_ADMIN))
+               limit = min(limit, global_limit);
+
+       if (t > limit)
+               return -EINVAL;
+
+       *val = t;
+
+       return count;
+}
+
+static ssize_t fuse_conn_max_background_read(struct file *file,
+                                            char __user *buf, size_t len,
+                                            loff_t *ppos)
+{
+       struct fuse_conn *fc;
+       unsigned val;
+
+       fc = fuse_ctl_file_conn_get(file);
+       if (!fc)
+               return 0;
+
+       val = fc->max_background;
+       fuse_conn_put(fc);
+
+       return fuse_conn_limit_read(file, buf, len, ppos, val);
+}
+
+static ssize_t fuse_conn_max_background_write(struct file *file,
+                                             const char __user *buf,
+                                             size_t count, loff_t *ppos)
+{
+       unsigned val;
+       ssize_t ret;
+
+       ret = fuse_conn_limit_write(file, buf, count, ppos, &val,
+                                   max_user_bgreq);
+       if (ret > 0) {
+               struct fuse_conn *fc = fuse_ctl_file_conn_get(file);
+               if (fc) {
+                       fc->max_background = val;
+                       fuse_conn_put(fc);
+               }
+       }
+
+       return ret;
+}
+
+static ssize_t fuse_conn_congestion_threshold_read(struct file *file,
+                                                  char __user *buf, size_t len,
+                                                  loff_t *ppos)
+{
+       struct fuse_conn *fc;
+       unsigned val;
+
+       fc = fuse_ctl_file_conn_get(file);
+       if (!fc)
+               return 0;
+
+       val = fc->congestion_threshold;
+       fuse_conn_put(fc);
+
+       return fuse_conn_limit_read(file, buf, len, ppos, val);
+}
+
+static ssize_t fuse_conn_congestion_threshold_write(struct file *file,
+                                                   const char __user *buf,
+                                                   size_t count, loff_t *ppos)
+{
+       unsigned val;
+       ssize_t ret;
+
+       ret = fuse_conn_limit_write(file, buf, count, ppos, &val,
+                                   max_user_congthresh);
+       if (ret > 0) {
+               struct fuse_conn *fc = fuse_ctl_file_conn_get(file);
+               if (fc) {
+                       fc->congestion_threshold = val;
+                       fuse_conn_put(fc);
+               }
+       }
+
+       return ret;
+}
+
 static const struct file_operations fuse_ctl_abort_ops = {
        .open = nonseekable_open,
        .write = fuse_conn_abort_write,
@@ -71,6 +186,18 @@ static const struct file_operations fuse_ctl_waiting_ops = {
        .read = fuse_conn_waiting_read,
 };
 
+static const struct file_operations fuse_conn_max_background_ops = {
+       .open = nonseekable_open,
+       .read = fuse_conn_max_background_read,
+       .write = fuse_conn_max_background_write,
+};
+
+static const struct file_operations fuse_conn_congestion_threshold_ops = {
+       .open = nonseekable_open,
+       .read = fuse_conn_congestion_threshold_read,
+       .write = fuse_conn_congestion_threshold_write,
+};
+
 static struct dentry *fuse_ctl_add_dentry(struct dentry *parent,
                                          struct fuse_conn *fc,
                                          const char *name,
@@ -127,9 +254,14 @@ int fuse_ctl_add_conn(struct fuse_conn *fc)
                goto err;
 
        if (!fuse_ctl_add_dentry(parent, fc, "waiting", S_IFREG | 0400, 1,
-                               NULL, &fuse_ctl_waiting_ops) ||
+                                NULL, &fuse_ctl_waiting_ops) ||
            !fuse_ctl_add_dentry(parent, fc, "abort", S_IFREG | 0200, 1,
-                                NULL, &fuse_ctl_abort_ops))
+                                NULL, &fuse_ctl_abort_ops) ||
+           !fuse_ctl_add_dentry(parent, fc, "max_background", S_IFREG | 0600,
+                                1, NULL, &fuse_conn_max_background_ops) ||
+           !fuse_ctl_add_dentry(parent, fc, "congestion_threshold",
+                                S_IFREG | 0600, 1, NULL,
+                                &fuse_conn_congestion_threshold_ops))
                goto err;
 
        return 0;

diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index 6bcfab0..fc9c79f 100644 (file)
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -32,7 +32,7 @@
 #define FUSE_NAME_MAX 1024
 
 /** Number of dentries for each connection in the control filesystem */
-#define FUSE_CTL_NUM_DENTRIES 3
+#define FUSE_CTL_NUM_DENTRIES 5
 
 /** If the FUSE_DEFAULT_PERMISSIONS flag is given, the filesystem
     module will check permissions based on the file mode.  Otherwise no
@@ -49,6 +49,10 @@ extern struct list_head fuse_conn_list;
 /** Global mutex protecting fuse_conn_list and the control filesystem */
 extern struct mutex fuse_mutex;
 
+/** Module parameters */
+extern unsigned max_user_bgreq;
+extern unsigned max_user_congthresh;
+
 /** FUSE inode */
 struct fuse_inode {
        /** Inode data */

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index e54ddbd..8f9aca8 100644 (file)
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -31,7 +31,7 @@ DEFINE_MUTEX(fuse_mutex);
 
 static int set_global_limit(const char *val, struct kernel_param *kp);
 
-static unsigned max_user_bgreq;
+unsigned max_user_bgreq;
 module_param_call(max_user_bgreq, set_global_limit, param_get_uint,
                  &max_user_bgreq, 0644);
 __MODULE_PARM_TYPE(max_user_bgreq, "uint");
@@ -39,7 +39,7 @@ MODULE_PARM_DESC(max_user_bgreq,
  "Global limit for the maximum number of backgrounded requests an "
  "unprivileged user can set");
 
-static unsigned max_user_congthresh;
+unsigned max_user_congthresh;
 module_param_call(max_user_congthresh, set_global_limit, param_get_uint,
                  &max_user_congthresh, 0644);
 __MODULE_PARM_TYPE(max_user_congthresh, "uint");