On Mon, 13 Dec 2010 15:22:14 +0800 Shaohua Li <[email protected]> wrote:
> Add metadata readahead ioctl in vfs. Filesystem can hook to > super_operations.metadata_readahead to handle filesystem specific task. > Next patch will give an example how btrfs implements it. > > Signed-off-by: Shaohua Li <[email protected]> > > --- > fs/compat_ioctl.c | 1 + > fs/ioctl.c | 21 +++++++++++++++++++++ > include/linux/fs.h | 8 ++++++++ > 3 files changed, 30 insertions(+) > > Index: linux/fs/ioctl.c > =================================================================== > --- linux.orig/fs/ioctl.c 2010-12-13 14:01:56.000000000 +0800 > +++ linux/fs/ioctl.c 2010-12-13 14:10:42.000000000 +0800 > @@ -605,6 +605,24 @@ static int ioctl_metadata_incore(struct > return entries; > } > > +static int ioctl_metadata_readahead(struct file *filp, void __user *argp) > +{ > + struct super_block *sb = filp->f_path.dentry->d_inode->i_sb; > + struct metadata_readahead_args args; > + > + if (!sb->s_op->metadata_readahead) > + return -EOPNOTSUPP; -ENOTNETWORKING > + if (copy_from_user(&args, (struct metadata_readahead_args __user *)argp, Unneeded cast. > + sizeof(args))) > + return -EFAULT; > + > + if ((args.offset & ~PAGE_CACHE_MASK) || (args.size & ~PAGE_CACHE_MASK)) Why? > + return -EINVAL; > + > + return sb->s_op->metadata_readahead(sb, args.offset, args.size); > +} > + -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
