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Then call exporter's rw_file callback function. Signed-off-by: wangtao --- drivers/dma-buf/dma-buf.c | 32 ++++++++++++++++++++++++++++++++ include/linux/dma-buf.h | 16 ++++++++++++++++ 2 files changed, 48 insertions(+) diff --git a/drivers/dma-buf/dma-buf.c b/drivers/dma-buf/dma-buf.c index 5baa83b85515..fc9bf54c921a 100644 --- a/drivers/dma-buf/dma-buf.c +++ b/drivers/dma-buf/dma-buf.c @@ -523,7 +523,38 @@ static void dma_buf_show_fdinfo(struct seq_file *m, struct file *file) spin_unlock(&dmabuf->name_lock); } +static ssize_t dma_buf_rw_file(struct dma_buf *dmabuf, loff_t my_pos, + struct file *file, loff_t pos, size_t count, bool is_write) +{ + if (!dmabuf->ops->rw_file) + return -EINVAL; + + if (my_pos >= dmabuf->size) + count = 0; + else + count = min_t(size_t, count, dmabuf->size - my_pos); + if (!count) + return 0; + + return dmabuf->ops->rw_file(dmabuf, my_pos, file, pos, count, is_write); +} + +static ssize_t dma_buf_copy_file_range(struct file *file_in, loff_t pos_in, + struct file *file_out, loff_t pos_out, + size_t count, unsigned int flags) +{ + if (is_dma_buf_file(file_in) && file_out->f_op->write_iter) + return dma_buf_rw_file(file_in->private_data, pos_in, + file_out, pos_out, count, true); + else if (is_dma_buf_file(file_out) && file_in->f_op->read_iter) + return dma_buf_rw_file(file_out->private_data, pos_out, + file_in, pos_in, count, false); + else + return -EINVAL; +} + static const struct file_operations dma_buf_fops = { + .fop_flags = FOP_MEMORY_FILE, .release = dma_buf_file_release, .mmap = dma_buf_mmap_internal, .llseek = dma_buf_llseek, @@ -531,6 +562,7 @@ static const struct file_operations dma_buf_fops = { .unlocked_ioctl = dma_buf_ioctl, .compat_ioctl = compat_ptr_ioctl, .show_fdinfo = dma_buf_show_fdinfo, + .copy_file_range = dma_buf_copy_file_range, }; /* diff --git a/include/linux/dma-buf.h b/include/linux/dma-buf.h index 36216d28d8bd..d3636e985399 100644 --- a/include/linux/dma-buf.h +++ b/include/linux/dma-buf.h @@ -22,6 +22,7 @@ #include #include #include +#include struct device; struct dma_buf; @@ -285,6 +286,21 @@ struct dma_buf_ops { int (*vmap)(struct dma_buf *dmabuf, struct iosys_map *map); void (*vunmap)(struct dma_buf *dmabuf, struct iosys_map *map); + + /** + * @rw_file: + * + * If an Exporter needs to support Direct I/O file operations, it can + * implement this optional callback. The exporter must verify that no + * other objects hold the sg_table, ensure exclusive access to the + * dmabuf's sg_table, and only then proceed with the I/O operation. + * + * Returns: + * + * 0 on success or a negative error code on failure. + */ + ssize_t (*rw_file)(struct dma_buf *dmabuf, loff_t my_pos, + struct file *file, loff_t pos, size_t count, bool is_write); }; /** -- 2.17.1