}
EXPORT_SYMBOL(fixed_size_llseek);
+/**
+ * no_seek_end_llseek - llseek implementation for fixed-sized devices
+ * @file: file structure to seek on
+ * @offset: file offset to seek to
+ * @whence: type of seek
+ *
+ */
+loff_t no_seek_end_llseek(struct file *file, loff_t offset, int whence)
+{
+ switch (whence) {
+ case SEEK_SET: case SEEK_CUR:
+ return generic_file_llseek_size(file, offset, whence,
+ ~0ULL, 0);
+ default:
+ return -EINVAL;
+ }
+}
+EXPORT_SYMBOL(no_seek_end_llseek);
+
+/**
+ * no_seek_end_llseek_size - llseek implementation for fixed-sized devices
+ * @file: file structure to seek on
+ * @offset: file offset to seek to
+ * @whence: type of seek
+ * @size: maximal offset allowed
+ *
+ */
+loff_t no_seek_end_llseek_size(struct file *file, loff_t offset, int whence, loff_t size)
+{
+ switch (whence) {
+ case SEEK_SET: case SEEK_CUR:
+ return generic_file_llseek_size(file, offset, whence,
+ size, 0);
+ default:
+ return -EINVAL;
+ }
+}
+EXPORT_SYMBOL(no_seek_end_llseek_size);
+
/**
* noop_llseek - No Operation Performed llseek implementation
* @file: file structure to seek on
}
if (unlikely(inode->i_flctx && mandatory_lock(inode))) {
- retval = locks_mandatory_area(
- read_write == READ ? FLOCK_VERIFY_READ : FLOCK_VERIFY_WRITE,
- inode, file, pos, count);
+ retval = locks_mandatory_area(inode, file, pos, pos + count - 1,
+ read_write == READ ? F_RDLCK : F_WRLCK);
if (retval < 0)
return retval;
}
out2:
return ret;
}
+
+static int clone_verify_area(struct file *file, loff_t pos, u64 len, bool write)
+{
+ struct inode *inode = file_inode(file);
+
+ if (unlikely(pos < 0))
+ return -EINVAL;
+
+ if (unlikely((loff_t) (pos + len) < 0))
+ return -EINVAL;
+
+ if (unlikely(inode->i_flctx && mandatory_lock(inode))) {
+ loff_t end = len ? pos + len - 1 : OFFSET_MAX;
+ int retval;
+
+ retval = locks_mandatory_area(inode, file, pos, end,
+ write ? F_WRLCK : F_RDLCK);
+ if (retval < 0)
+ return retval;
+ }
+
+ return security_file_permission(file, write ? MAY_WRITE : MAY_READ);
+}
+
+int vfs_clone_file_range(struct file *file_in, loff_t pos_in,
+ struct file *file_out, loff_t pos_out, u64 len)
+{
+ struct inode *inode_in = file_inode(file_in);
+ struct inode *inode_out = file_inode(file_out);
+ int ret;
+
+ if (inode_in->i_sb != inode_out->i_sb ||
+ file_in->f_path.mnt != file_out->f_path.mnt)
+ return -EXDEV;
+
+ if (S_ISDIR(inode_in->i_mode) || S_ISDIR(inode_out->i_mode))
+ return -EISDIR;
+ if (!S_ISREG(inode_in->i_mode) || !S_ISREG(inode_out->i_mode))
+ return -EINVAL;
+
+ if (!(file_in->f_mode & FMODE_READ) ||
+ !(file_out->f_mode & FMODE_WRITE) ||
+ (file_out->f_flags & O_APPEND) ||
+ !file_in->f_op->clone_file_range)
+ return -EBADF;
+
+ ret = clone_verify_area(file_in, pos_in, len, false);
+ if (ret)
+ return ret;
+
+ ret = clone_verify_area(file_out, pos_out, len, true);
+ if (ret)
+ return ret;
+
+ if (pos_in + len > i_size_read(inode_in))
+ return -EINVAL;
+
+ ret = mnt_want_write_file(file_out);
+ if (ret)
+ return ret;
+
+ ret = file_in->f_op->clone_file_range(file_in, pos_in,
+ file_out, pos_out, len);
+ if (!ret) {
+ fsnotify_access(file_in);
+ fsnotify_modify(file_out);
+ }
+
+ mnt_drop_write_file(file_out);
+ return ret;
+}
+EXPORT_SYMBOL(vfs_clone_file_range);
+
+int vfs_dedupe_file_range(struct file *file, struct file_dedupe_range *same)
+{
+ struct file_dedupe_range_info *info;
+ struct inode *src = file_inode(file);
+ u64 off;
+ u64 len;
+ int i;
+ int ret;
+ bool is_admin = capable(CAP_SYS_ADMIN);
+ u16 count = same->dest_count;
+ struct file *dst_file;
+ loff_t dst_off;
+ ssize_t deduped;
+
+ if (!(file->f_mode & FMODE_READ))
+ return -EINVAL;
+
+ if (same->reserved1 || same->reserved2)
+ return -EINVAL;
+
+ off = same->src_offset;
+ len = same->src_length;
+
+ ret = -EISDIR;
+ if (S_ISDIR(src->i_mode))
+ goto out;
+
+ ret = -EINVAL;
+ if (!S_ISREG(src->i_mode))
+ goto out;
+
+ ret = clone_verify_area(file, off, len, false);
+ if (ret < 0)
+ goto out;
+ ret = 0;
+
+ /* pre-format output fields to sane values */
+ for (i = 0; i < count; i++) {
+ same->info[i].bytes_deduped = 0ULL;
+ same->info[i].status = FILE_DEDUPE_RANGE_SAME;
+ }
+
+ for (i = 0, info = same->info; i < count; i++, info++) {
+ struct inode *dst;
+ struct fd dst_fd = fdget(info->dest_fd);
+
+ dst_file = dst_fd.file;
+ if (!dst_file) {
+ info->status = -EBADF;
+ goto next_loop;
+ }
+ dst = file_inode(dst_file);
+
+ ret = mnt_want_write_file(dst_file);
+ if (ret) {
+ info->status = ret;
+ goto next_loop;
+ }
+
+ dst_off = info->dest_offset;
+ ret = clone_verify_area(dst_file, dst_off, len, true);
+ if (ret < 0) {
+ info->status = ret;
+ goto next_file;
+ }
+ ret = 0;
+
+ if (info->reserved) {
+ info->status = -EINVAL;
+ } else if (!(is_admin || (dst_file->f_mode & FMODE_WRITE))) {
+ info->status = -EINVAL;
+ } else if (file->f_path.mnt != dst_file->f_path.mnt) {
+ info->status = -EXDEV;
+ } else if (S_ISDIR(dst->i_mode)) {
+ info->status = -EISDIR;
+ } else if (dst_file->f_op->dedupe_file_range == NULL) {
+ info->status = -EINVAL;
+ } else {
+ deduped = dst_file->f_op->dedupe_file_range(file, off,
+ len, dst_file,
+ info->dest_offset);
+ if (deduped == -EBADE)
+ info->status = FILE_DEDUPE_RANGE_DIFFERS;
+ else if (deduped < 0)
+ info->status = deduped;
+ else
+ info->bytes_deduped += deduped;
+ }
+
+next_file:
+ mnt_drop_write_file(dst_file);
+next_loop:
+ fdput(dst_fd);
+ }
+
+out:
+ return ret;
+}
+EXPORT_SYMBOL(vfs_dedupe_file_range);
projects / linux-2.6-microblaze.git / blobdiff