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https://github.com/torvalds/linux
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ovl: add reflink/copyfile/dedup support
Since set of arguments are so similar, handle in a common helper. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
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@ -389,6 +389,89 @@ static long ovl_compat_ioctl(struct file *file, unsigned int cmd,
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return ovl_ioctl(file, cmd, arg);
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}
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enum ovl_copyop {
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OVL_COPY,
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OVL_CLONE,
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OVL_DEDUPE,
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};
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static ssize_t ovl_copyfile(struct file *file_in, loff_t pos_in,
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struct file *file_out, loff_t pos_out,
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u64 len, unsigned int flags, enum ovl_copyop op)
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{
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struct inode *inode_out = file_inode(file_out);
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struct fd real_in, real_out;
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const struct cred *old_cred;
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ssize_t ret;
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ret = ovl_real_fdget(file_out, &real_out);
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if (ret)
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return ret;
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ret = ovl_real_fdget(file_in, &real_in);
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if (ret) {
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fdput(real_out);
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return ret;
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}
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old_cred = ovl_override_creds(file_inode(file_out)->i_sb);
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switch (op) {
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case OVL_COPY:
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ret = vfs_copy_file_range(real_in.file, pos_in,
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real_out.file, pos_out, len, flags);
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break;
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case OVL_CLONE:
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ret = vfs_clone_file_range(real_in.file, pos_in,
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real_out.file, pos_out, len);
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break;
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case OVL_DEDUPE:
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ret = vfs_dedupe_file_range_one(real_in.file, pos_in,
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real_out.file, pos_out, len);
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break;
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}
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revert_creds(old_cred);
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/* Update size */
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ovl_copyattr(ovl_inode_real(inode_out), inode_out);
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fdput(real_in);
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fdput(real_out);
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return ret;
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}
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static ssize_t ovl_copy_file_range(struct file *file_in, loff_t pos_in,
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struct file *file_out, loff_t pos_out,
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size_t len, unsigned int flags)
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{
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return ovl_copyfile(file_in, pos_in, file_out, pos_out, len, flags,
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OVL_COPY);
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}
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static int ovl_clone_file_range(struct file *file_in, loff_t pos_in,
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struct file *file_out, loff_t pos_out, u64 len)
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{
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return ovl_copyfile(file_in, pos_in, file_out, pos_out, len, 0,
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OVL_CLONE);
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}
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static int ovl_dedupe_file_range(struct file *file_in, loff_t pos_in,
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struct file *file_out, loff_t pos_out, u64 len)
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{
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/*
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* Don't copy up because of a dedupe request, this wouldn't make sense
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* most of the time (data would be duplicated instead of deduplicated).
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*/
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if (!ovl_inode_upper(file_inode(file_in)) ||
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!ovl_inode_upper(file_inode(file_out)))
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return -EPERM;
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return ovl_copyfile(file_in, pos_in, file_out, pos_out, len, 0,
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OVL_DEDUPE);
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}
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const struct file_operations ovl_file_operations = {
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.open = ovl_open,
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.release = ovl_release,
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@ -400,4 +483,8 @@ const struct file_operations ovl_file_operations = {
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.fallocate = ovl_fallocate,
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.unlocked_ioctl = ovl_ioctl,
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.compat_ioctl = ovl_compat_ioctl,
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.copy_file_range = ovl_copy_file_range,
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.clone_file_range = ovl_clone_file_range,
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.dedupe_file_range = ovl_dedupe_file_range,
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};
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