diff options
Diffstat (limited to 'include/linux/vfs_compat.h')
| -rw-r--r-- | include/linux/vfs_compat.h | 45 |
1 files changed, 29 insertions, 16 deletions
diff --git a/include/linux/vfs_compat.h b/include/linux/vfs_compat.h index cbbf21e61..825a7fd3b 100644 --- a/include/linux/vfs_compat.h +++ b/include/linux/vfs_compat.h @@ -62,23 +62,36 @@ truncate_setsize(struct inode *ip, loff_t new) } #endif /* HAVE_TRUNCATE_SETSIZE */ +#if defined(HAVE_BDI) && !defined(HAVE_BDI_SETUP_AND_REGISTER) /* - * 2.6.32 API change, - * Added backing_device_info (bdi) per super block interfaces. When - * available a bdi must be configured when using a non-device backed - * filesystem for proper writeback. It's safe to leave this code - * dormant for kernels which only support pdflush and not bdi. + * 2.6.34 API change, + * Add bdi_setup_and_register() function if not yet provided by kernel. + * It is used to quickly initialize and register a BDI for the filesystem. */ -#ifdef HAVE_BDI -#define bdi_get_sb(sb) (sb->s_bdi) -#define bdi_put_sb(sb, bdi) (sb->s_bdi = bdi) -#else -#define bdi_init(bdi) (0) -#define bdi_destroy(bdi) (0) -#define bdi_register(bdi, parent, fmt, args) (0) -#define bdi_unregister(bdi) (0) -#define bdi_get_sb(sb) (0) -#define bdi_put_sb(sb, bdi) (0) -#endif /* HAVE_BDI */ +extern atomic_long_t zfs_bdi_seq; + +static inline int +bdi_setup_and_register(struct backing_dev_info *bdi,char *name,unsigned int cap) +{ + char tmp[32]; + int error; + + bdi->name = name; + bdi->capabilities = cap; + error = bdi_init(bdi); + if (error) + return (error); + + sprintf(tmp, "%.28s%s", name, "-%d"); + error = bdi_register(bdi, NULL, tmp, + atomic_long_inc_return(&zfs_bdi_seq)); + if (error) { + bdi_destroy(bdi); + return (error); + } + + return (error); +} +#endif /* HAVE_BDI && !HAVE_BDI_SETUP_AND_REGISTER */ #endif /* _ZFS_VFS_H */ |