fuse: fix large stack use

[safe/jmp/linux-2.6] / fs / fuse / dev.c

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index 368189f..eb7e942 100644 (file)
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -46,6 +46,7 @@ struct fuse_req *fuse_request_alloc(void)
                fuse_request_init(req);
        return req;
 }
+EXPORT_SYMBOL_GPL(fuse_request_alloc);
 
 struct fuse_req *fuse_request_alloc_nofs(void)
 {
@@ -124,6 +125,7 @@ struct fuse_req *fuse_get_req(struct fuse_conn *fc)
        atomic_dec(&fc->num_waiting);
        return ERR_PTR(err);
 }
+EXPORT_SYMBOL_GPL(fuse_get_req);
 
 /*
  * Return request in fuse_file->reserved_req.  However that may
@@ -208,6 +210,7 @@ void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req)
                        fuse_request_free(req);
        }
 }
+EXPORT_SYMBOL_GPL(fuse_put_request);
 
 static unsigned len_args(unsigned numargs, struct fuse_arg *args)
 {
@@ -247,7 +250,7 @@ static void queue_request(struct fuse_conn *fc, struct fuse_req *req)
 
 static void flush_bg_queue(struct fuse_conn *fc)
 {
-       while (fc->active_background < FUSE_MAX_BACKGROUND &&
+       while (fc->active_background < fc->max_background &&
               !list_empty(&fc->bg_queue)) {
                struct fuse_req *req;
 
@@ -277,14 +280,14 @@ __releases(&fc->lock)
        list_del(&req->intr_entry);
        req->state = FUSE_REQ_FINISHED;
        if (req->background) {
-               if (fc->num_background == FUSE_MAX_BACKGROUND) {
+               if (fc->num_background == fc->max_background) {
                        fc->blocked = 0;
                        wake_up_all(&fc->blocked_waitq);
                }
-               if (fc->num_background == FUSE_CONGESTION_THRESHOLD &&
+               if (fc->num_background == fc->congestion_threshold &&
                    fc->connected && fc->bdi_initialized) {
-                       clear_bdi_congested(&fc->bdi, READ);
-                       clear_bdi_congested(&fc->bdi, WRITE);
+                       clear_bdi_congested(&fc->bdi, BLK_RW_SYNC);
+                       clear_bdi_congested(&fc->bdi, BLK_RW_ASYNC);
                }
                fc->num_background--;
                fc->active_background--;
@@ -400,18 +403,19 @@ void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req)
        }
        spin_unlock(&fc->lock);
 }
+EXPORT_SYMBOL_GPL(fuse_request_send);
 
 static void fuse_request_send_nowait_locked(struct fuse_conn *fc,
                                            struct fuse_req *req)
 {
        req->background = 1;
        fc->num_background++;
-       if (fc->num_background == FUSE_MAX_BACKGROUND)
+       if (fc->num_background == fc->max_background)
                fc->blocked = 1;
-       if (fc->num_background == FUSE_CONGESTION_THRESHOLD &&
+       if (fc->num_background == fc->congestion_threshold &&
            fc->bdi_initialized) {
-               set_bdi_congested(&fc->bdi, READ);
-               set_bdi_congested(&fc->bdi, WRITE);
+               set_bdi_congested(&fc->bdi, BLK_RW_SYNC);
+               set_bdi_congested(&fc->bdi, BLK_RW_ASYNC);
        }
        list_add_tail(&req->list, &fc->bg_queue);
        flush_bg_queue(fc);
@@ -440,6 +444,7 @@ void fuse_request_send_background(struct fuse_conn *fc, struct fuse_req *req)
        req->isreply = 1;
        fuse_request_send_nowait(fc, req);
 }
+EXPORT_SYMBOL_GPL(fuse_request_send_background);
 
 /*
  * Called under fc->lock
@@ -844,6 +849,81 @@ err:
        return err;
 }
 
+static int fuse_notify_inval_inode(struct fuse_conn *fc, unsigned int size,
+                                  struct fuse_copy_state *cs)
+{
+       struct fuse_notify_inval_inode_out outarg;
+       int err = -EINVAL;
+
+       if (size != sizeof(outarg))
+               goto err;
+
+       err = fuse_copy_one(cs, &outarg, sizeof(outarg));
+       if (err)
+               goto err;
+       fuse_copy_finish(cs);
+
+       down_read(&fc->killsb);
+       err = -ENOENT;
+       if (fc->sb) {
+               err = fuse_reverse_inval_inode(fc->sb, outarg.ino,
+                                              outarg.off, outarg.len);
+       }
+       up_read(&fc->killsb);
+       return err;
+
+err:
+       fuse_copy_finish(cs);
+       return err;
+}
+
+static int fuse_notify_inval_entry(struct fuse_conn *fc, unsigned int size,
+                                  struct fuse_copy_state *cs)
+{
+       struct fuse_notify_inval_entry_out outarg;
+       int err = -ENOMEM;
+       char *buf;
+       struct qstr name;
+
+       buf = kzalloc(FUSE_NAME_MAX + 1, GFP_KERNEL);
+       if (!buf)
+               goto err;
+
+       err = -EINVAL;
+       if (size < sizeof(outarg))
+               goto err;
+
+       err = fuse_copy_one(cs, &outarg, sizeof(outarg));
+       if (err)
+               goto err;
+
+       err = -ENAMETOOLONG;
+       if (outarg.namelen > FUSE_NAME_MAX)
+               goto err;
+
+       name.name = buf;
+       name.len = outarg.namelen;
+       err = fuse_copy_one(cs, buf, outarg.namelen + 1);
+       if (err)
+               goto err;
+       fuse_copy_finish(cs);
+       buf[outarg.namelen] = 0;
+       name.hash = full_name_hash(name.name, name.len);
+
+       down_read(&fc->killsb);
+       err = -ENOENT;
+       if (fc->sb)
+               err = fuse_reverse_inval_entry(fc->sb, outarg.parent, &name);
+       up_read(&fc->killsb);
+       kfree(buf);
+       return err;
+
+err:
+       kfree(buf);
+       fuse_copy_finish(cs);
+       return err;
+}
+
 static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,
                       unsigned int size, struct fuse_copy_state *cs)
 {
@@ -851,6 +931,12 @@ static int fuse_notify(struct fuse_conn *fc, enum fuse_notify_code code,
        case FUSE_NOTIFY_POLL:
                return fuse_notify_poll(fc, size, cs);
 
+       case FUSE_NOTIFY_INVAL_INODE:
+               return fuse_notify_inval_inode(fc, size, cs);
+
+       case FUSE_NOTIFY_INVAL_ENTRY:
+               return fuse_notify_inval_entry(fc, size, cs);
+
        default:
                fuse_copy_finish(cs);
                return -EINVAL;
@@ -905,7 +991,7 @@ static ssize_t fuse_dev_write(struct kiocb *iocb, const struct iovec *iov,
                               unsigned long nr_segs, loff_t pos)
 {
        int err;
-       unsigned nbytes = iov_length(iov, nr_segs);
+       size_t nbytes = iov_length(iov, nr_segs);
        struct fuse_req *req;
        struct fuse_out_header oh;
        struct fuse_copy_state cs;
@@ -1106,8 +1192,9 @@ void fuse_abort_conn(struct fuse_conn *fc)
        }
        spin_unlock(&fc->lock);
 }
+EXPORT_SYMBOL_GPL(fuse_abort_conn);
 
-static int fuse_dev_release(struct inode *inode, struct file *file)
+int fuse_dev_release(struct inode *inode, struct file *file)
 {
        struct fuse_conn *fc = fuse_get_conn(file);
        if (fc) {
@@ -1121,6 +1208,7 @@ static int fuse_dev_release(struct inode *inode, struct file *file)
 
        return 0;
 }
+EXPORT_SYMBOL_GPL(fuse_dev_release);
 
 static int fuse_dev_fasync(int fd, struct file *file, int on)
 {
@@ -1143,6 +1231,7 @@ const struct file_operations fuse_dev_operations = {
        .release        = fuse_dev_release,
        .fasync         = fuse_dev_fasync,
 };
+EXPORT_SYMBOL_GPL(fuse_dev_operations);
 
 static struct miscdevice fuse_miscdevice = {
        .minor = FUSE_MINOR,