diff options
| -rw-r--r-- | drivers/xen/xenfs/super.c | 42 |
1 files changed, 38 insertions, 4 deletions
diff --git a/drivers/xen/xenfs/super.c b/drivers/xen/xenfs/super.c index 8c7462866e9..23f1cca5a2e 100644 --- a/drivers/xen/xenfs/super.c +++ b/drivers/xen/xenfs/super.c @@ -12,6 +12,8 @@ #include <linux/module.h> #include <linux/fs.h> #include <linux/magic.h> +#include <linux/mm.h> +#include <linux/backing-dev.h> #include <xen/xen.h> @@ -22,12 +24,30 @@ MODULE_DESCRIPTION("Xen filesystem"); MODULE_LICENSE("GPL"); +static int xenfs_set_page_dirty(struct page *page) +{ + if (!PageDirty(page)) + SetPageDirty(page); + return 0; +} + +static const struct address_space_operations xenfs_aops = { + .set_page_dirty = xenfs_set_page_dirty, +}; + +static struct backing_dev_info xenfs_backing_dev_info = { + .ra_pages = 0, /* No readahead */ + .capabilities = BDI_CAP_NO_ACCT_AND_WRITEBACK, +}; + static struct inode *xenfs_make_inode(struct super_block *sb, int mode) { struct inode *ret = new_inode(sb); if (ret) { ret->i_mode = mode; + ret->i_mapping->a_ops = &xenfs_aops; + ret->i_mapping->backing_dev_info = &xenfs_backing_dev_info; ret->i_uid = ret->i_gid = 0; ret->i_blocks = 0; ret->i_atime = ret->i_mtime = ret->i_ctime = CURRENT_TIME; @@ -119,11 +139,25 @@ static struct file_system_type xenfs_type = { static int __init xenfs_init(void) { - if (xen_domain()) - return register_filesystem(&xenfs_type); + int err; + if (!xen_domain()) { + printk(KERN_INFO "xenfs: not registering filesystem on non-xen platform\n"); + return 0; + } - printk(KERN_INFO "XENFS: not registering filesystem on non-xen platform\n"); - return 0; + err = register_filesystem(&xenfs_type); + if (err) { + printk(KERN_ERR "xenfs: Unable to register filesystem!\n"); + goto out; + } + + err = bdi_init(&xenfs_backing_dev_info); + if (err) + unregister_filesystem(&xenfs_type); + + out: + + return err; } static void __exit xenfs_exit(void) |