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Btrfs: fix sync subvol/snapshot creation 

We were incorrectly taking the async path even for the sync ioctls by
passing in &transid unconditionally.

There's ample room for further cleanup here, but this keeps the fix simple.

Signed-off-by: Sage Weil <sage@newdream.net>
Reviewed-by: Li Zefan <lizf@cn.fujitsu.com>
Signed-off-by: Chris Mason <chris.mason@oracle.com>
wifi-calibration
Sage Weil 2010-12-10 00:36:28 +00:00 committed by Chris Mason
parent 24ae63656a
commit 75eaa0e22c
1 changed files with 11 additions and 9 deletions
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20
fs/btrfs/ioctl.c
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@ -964,6 +964,15 @@ static noinline int btrfs_ioctl_snap_create(struct file *file,
name = async_vol_args->name;
fd = async_vol_args->fd;
async_vol_args->name[BTRFS_SNAPSHOT_NAME_MAX] = '\0';
ret = btrfs_ioctl_snap_create_transid(file, name, fd,
subvol, &transid);
if (ret == 0 &&
copy_to_user(arg +
offsetof(struct btrfs_ioctl_async_vol_args,
transid), &transid, sizeof(transid)))
ret = -EFAULT;
} else {
vol_args = memdup_user(arg, sizeof(*vol_args));
if (IS_ERR(vol_args))
@ -971,16 +980,9 @@ static noinline int btrfs_ioctl_snap_create(struct file *file,
name = vol_args->name;
fd = vol_args->fd;
vol_args->name[BTRFS_PATH_NAME_MAX] = '\0';
}
ret = btrfs_ioctl_snap_create_transid(file, name, fd,
subvol, &transid);
if (!ret && async) {
if (copy_to_user(arg +
offsetof(struct btrfs_ioctl_async_vol_args,
transid), &transid, sizeof(transid)))
return -EFAULT;
ret = btrfs_ioctl_snap_create_transid(file, name, fd,
subvol, NULL);
}
kfree(vol_args);