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vfs: hoist the btrfs deduplication ioctl to the vfs

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Hoist the btrfs EXTENT_SAME ioctl up to the VFS and make the name
more systematic (FIDEDUPERANGE).

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Darrick J. Wong
2015-12-19 00:55:59 -08:00
committed by Al Viro
parent d79bdd52d8
commit 54dbc15172
5 changed files with 173 additions and 0 deletions
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38
fs/ioctl.c
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@@ -568,6 +568,41 @@ static int ioctl_fsthaw(struct file *filp)
return thaw_super(sb);
}
static long ioctl_file_dedupe_range(struct file *file, void __user *arg)
{
struct file_dedupe_range __user *argp = arg;
struct file_dedupe_range *same = NULL;
int ret;
unsigned long size;
u16 count;
if (get_user(count, &argp->dest_count)) {
ret = -EFAULT;
goto out;
}
size = offsetof(struct file_dedupe_range __user, info[count]);
same = memdup_user(argp, size);
if (IS_ERR(same)) {
ret = PTR_ERR(same);
same = NULL;
goto out;
}
ret = vfs_dedupe_file_range(file, same);
if (ret)
goto out;
ret = copy_to_user(argp, same, size);
if (ret)
ret = -EFAULT;
out:
kfree(same);
return ret;
}
/*
* When you add any new common ioctls to the switches above and below
* please update compat_sys_ioctl() too.
@@ -629,6 +664,9 @@ int do_vfs_ioctl(struct file *filp, unsigned int fd, unsigned int cmd,
case FICLONERANGE:
return ioctl_file_clone_range(filp, argp);
case FIDEDUPERANGE:
return ioctl_file_dedupe_range(filp, argp);
default:
if (S_ISREG(inode->i_mode))
error = file_ioctl(filp, cmd, arg);