On Wed, Apr 16, 2014 at 10:00 AM, Chandan Rajendra
<chan...@linux.vnet.ibm.com> wrote:
> On Tuesday 01 Apr 2014 11:53:19 PM Filipe David Borba Manana wrote:
>> +static int btrfs_tmpfile(struct inode *dir, struct dentry *dentry, umode_t
>> mode)
>> +{
>> + struct btrfs_trans_handle *trans;
>> + struct btrfs_root *root = BTRFS_I(dir)->root;
>> + struct inode *inode = NULL;
>> + u64 objectid;
>> + u64 index;
>> + int ret = 0;
>> +
>> + /*
>> + * 2 for inode item and ref
>> + * 2 for dir items
>> + * 1 for xattr if selinux is on
>> + */
>> + trans = btrfs_start_transaction(root, 5);
>> + if (IS_ERR(trans))
>> + return PTR_ERR(trans);
>> +
>
> Hello,
>
> Any particular reason to reserve space for 5 items? For the O_TMPFILE
> case we seem to allocate and use just the one inode item and none of
> the associated 'inode ref', 'dir item' and 'dir index item' since
> there is no directory entry associated with the file. I am not
> sure about the xattr item though.
Correct, not needed for directory entries.
The xattr is needed for the case where an acl is inherited. And 5
units are required for orphan insertion (see comment on top of
btrfs_orphan_add).
I'll update the comment.
Thanks
>
> Thanks,
> chandan.
>
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