find the target one below. I haven't found the ecryptfs work, but it
is a lot more involved as it only wants to use direct I/O, not aio.
--- a/drivers/target/target_core_file.c
+++ b/drivers/target/target_core_file.c
@@ -31,6 +31,7 @@
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/falloc.h>
+#include <linux/blk_types.h>
#include <scsi/scsi.h>
#include <scsi/scsi_host.h>
#include <asm/unaligned.h>
@@ -120,6 +121,8 @@ static int fd_configure_device(struct se_device *dev)
* of pure timestamp updates.
*/
flags = O_RDWR | O_CREAT | O_LARGEFILE | O_DSYNC;
+ if (1)
+ flags |= O_DIRECT;
/*
* Optionally allow fd_buffered_io=1 to be enabled for people
@@ -546,6 +549,61 @@ fd_execute_unmap(struct se_cmd *cmd)
return sbc_execute_unmap(cmd, fd_do_unmap, file);
}
+static void fd_rw_aio_complete(u64 data, long res)
+{
+ struct se_cmd *cmd = (struct se_cmd *)(uintptr_t)data;
+
+ kfree(cmd->priv);
+
+ if (res < 0)
+ target_complete_cmd(cmd, SAM_STAT_CHECK_CONDITION);
+ else
+ target_complete_cmd(cmd, SAM_STAT_GOOD);
+}
+
+static sense_reason_t
+fd_rw_aio(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
+ enum dma_data_direction data_direction)
+{
+ struct se_device *se_dev = cmd->se_dev;
+ struct fd_dev *dev = FD_DEV(se_dev);
+ struct file *file = dev->fd_file;
+ struct scatterlist *sg;
+ struct kiocb *iocb;
+ unsigned int op;
+ struct iov_iter iter;
+ struct bio_vec *bvec;
+ loff_t pos = (cmd->t_task_lba * se_dev->dev_attrib.block_size);
+ int i;
+
+ iocb = aio_kernel_alloc(GFP_NOIO);
+ if (!iocb)
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+
+ if (data_direction == DMA_TO_DEVICE)
+ op = IOCB_CMD_WRITE_ITER;
+ else
+ op = IOCB_CMD_READ_ITER;
+
+ bvec = cmd->priv = kcalloc(sgl_nents, sizeof(struct bio_vec), GFP_NOIO);
+ if (!bvec) {
+ aio_kernel_free(iocb);
+ return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
+ }
+
+ for_each_sg(sgl, sg, sgl_nents, i) {
+ bvec[i].bv_page = sg_page(sg);
+ bvec[i].bv_len = sg->length;
+ bvec[i].bv_offset = sg->offset;
+ }
+
+ iov_iter_init_bvec(&iter, bvec, sgl_nents, bvec_length(bvec, sgl_nents), 0);
+ aio_kernel_init_rw(iocb, file, iov_iter_count(&iter), pos);
+ aio_kernel_init_callback(iocb, fd_rw_aio_complete, (u64)(uintptr_t)bvec);
+
+ return aio_kernel_submit(iocb, op, &iter);
+}
+
static sense_reason_t
fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
enum dma_data_direction data_direction)
@@ -553,6 +611,9 @@ fd_execute_rw(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
struct se_device *dev = cmd->se_dev;
int ret = 0;
+ if (1)
+ return fd_rw_aio(cmd, sgl, sgl_nents, data_direction);
+
/*
* Call vectorized fileio functions to map struct scatterlist
* physical memory addresses to struct iovec virtual memory.
--
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