1 files changed, 39 insertions, 10 deletions

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index c4fcfd59cd80..7d01c68852a8 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -59,7 +59,11 @@ static struct inode *fuse_alloc_inode(struct super_block *sb)
         fi->nodeid = 0;
         fi->nlookup = 0;
         fi->attr_version = 0;
+        fi->writectr = 0;
         INIT_LIST_HEAD(&fi->write_files);
+        INIT_LIST_HEAD(&fi->queued_writes);
+        INIT_LIST_HEAD(&fi->writepages);
+        init_waitqueue_head(&fi->page_waitq);
         fi->forget_req = fuse_request_alloc();
         if (!fi->forget_req) {
                 kmem_cache_free(fuse_inode_cachep, inode);
@@ -73,6 +77,7 @@ static void fuse_destroy_inode(struct inode *inode)
 {
         struct fuse_inode *fi = get_fuse_inode(inode);
         BUG_ON(!list_empty(&fi->write_files));
+        BUG_ON(!list_empty(&fi->queued_writes));
         if (fi->forget_req)
                 fuse_request_free(fi->forget_req);
         kmem_cache_free(fuse_inode_cachep, inode);
@@ -109,7 +114,7 @@ static int fuse_remount_fs(struct super_block *sb, int *flags, char *data)
         return 0;
 }
 
-static void fuse_truncate(struct address_space *mapping, loff_t offset)
+void fuse_truncate(struct address_space *mapping, loff_t offset)
 {
         /* See vmtruncate() */
         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
@@ -117,19 +122,12 @@ static void fuse_truncate(struct address_space *mapping, loff_t offset)
         unmap_mapping_range(mapping, offset + PAGE_SIZE - 1, 0, 1);
 }
 
-
-void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
-                            u64 attr_valid, u64 attr_version)
+void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
+                                   u64 attr_valid)
 {
         struct fuse_conn *fc = get_fuse_conn(inode);
         struct fuse_inode *fi = get_fuse_inode(inode);
-        loff_t oldsize;
 
-        spin_lock(&fc->lock);
-        if (attr_version != 0 && fi->attr_version > attr_version) {
-                spin_unlock(&fc->lock);
-                return;
-        }
         fi->attr_version = ++fc->attr_version;
         fi->i_time = attr_valid;
 
@@ -159,6 +157,22 @@ void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
         fi->orig_i_mode = inode->i_mode;
         if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
                 inode->i_mode &= ~S_ISVTX;
+}
+
+void fuse_change_attributes(struct inode *inode, struct fuse_attr *attr,
+                            u64 attr_valid, u64 attr_version)
+{
+        struct fuse_conn *fc = get_fuse_conn(inode);
+        struct fuse_inode *fi = get_fuse_inode(inode);
+        loff_t oldsize;
+
+        spin_lock(&fc->lock);
+        if (attr_version != 0 && fi->attr_version > attr_version) {
+                spin_unlock(&fc->lock);
+                return;
+        }
+
+        fuse_change_attributes_common(inode, attr, attr_valid);
 
         oldsize = inode->i_size;
         i_size_write(inode, attr->size);
@@ -468,6 +482,8 @@ static struct fuse_conn *new_conn(struct super_block *sb)
                 atomic_set(&fc->num_waiting, 0);
                 fc->bdi.ra_pages = (VM_MAX_READAHEAD * 1024) / PAGE_CACHE_SIZE;
                 fc->bdi.unplug_io_fn = default_unplug_io_fn;
+                /* fuse does it's own writeback accounting */
+                fc->bdi.capabilities = BDI_CAP_NO_ACCT_WB;
                 fc->dev = sb->s_dev;
                 err = bdi_init(&fc->bdi);
                 if (err)
@@ -475,6 +491,19 @@ static struct fuse_conn *new_conn(struct super_block *sb)
                 err = bdi_register_dev(&fc->bdi, fc->dev);
                 if (err)
                         goto error_bdi_destroy;
+                /*
+                 * For a single fuse filesystem use max 1% of dirty +
+                 * writeback threshold.
+                 *
+                 * This gives about 1M of write buffer for memory maps on a
+                 * machine with 1G and 10% dirty_ratio, which should be more
+                 * than enough.
+                 *
+                 * Privileged users can raise it by writing to
+                 *
+                 *    /sys/class/bdi/<bdi>/max_ratio
+                 */
+                bdi_set_max_ratio(&fc->bdi, 1);
                 fc->reqctr = 0;
                 fc->blocked = 1;
                 fc->attr_version = 1;