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>

1 files changed, 134 insertions, 2 deletions

diff --git a/fs/fuse/control.c b/fs/fuse/control.c
index 218d514924c0..3773fd63d2f9 100644
--- 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;