Trond Myklebust <[email protected]> wrote:
>
Looks good from a quick scan.
> +static int do_posix_truncate(struct dentry *dentry, loff_t length)
> +{
> + int err = 0;
> + struct iattr newattrs;
> +
> + newattrs.ia_size = length;
> + newattrs.ia_valid = ATTR_SIZE;
> +
> + down(&dentry->d_inode->i_sem);
> + /* In SuS/Posix lore, truncate to the current file size is a no-op */
> + if (length != i_size_read(dentry->d_inode))
> + err = notify_change(dentry, &newattrs);
> + up(&dentry->d_inode->i_sem);
> + return err;
> +}
I'm not sure that we really need to bother putting the i_size test inside
i_sem. If somebody is changing the file size in parallel with truncate
then they'll get unpredictable results anyway. Needs deep thought.
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