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Filesystem: Add readv/writev handlers

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The readv() and writev() support was implemented in terms of multiple
calls to the read and write handlers.  This imposes a problem on device
files which use an IO vector as single request entity.  For example a
low-level network device (e.g. BPF(4)) may use an IO vector to create
one frame from multiple protocol layers each with its own IO vector
entry.
This commit is contained in:
Sebastian Huber
2013-12-16 13:44:13 +01:00
parent 95a57280eb
commit 2f68778f08
28 changed files with 402 additions and 148 deletions
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49
testsuites/fstests/fsimfsgeneric01/init.c
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@@ -20,6 +20,7 @@
#include <sys/stat.h>
#include <sys/ioctl.h>
#include <sys/uio.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
@@ -41,6 +42,8 @@ typedef enum {
TEST_FSYNC,
TEST_FDATASYNC,
TEST_FCNTL,
TEST_READV,
TEST_WRITEV,
TEST_CLOSED,
TEST_FSTAT_UNLINK,
TEST_REMOVED,
@@ -68,7 +71,7 @@ static int handler_close(
{
test_state *state = IMFS_generic_get_context_by_iop(iop);
rtems_test_assert(*state == TEST_FCNTL);
rtems_test_assert(*state == TEST_WRITEV);
*state = TEST_CLOSED;
return 0;
@@ -202,6 +205,36 @@ static int handler_fcntl(
return 0;
}
static ssize_t handler_readv(
rtems_libio_t *iop,
const struct iovec *iov,
int iovcnt,
ssize_t total
)
{
test_state *state = IMFS_generic_get_context_by_iop(iop);
rtems_test_assert(*state == TEST_FCNTL);
*state = TEST_READV;
return 0;
}
static ssize_t handler_writev(
rtems_libio_t *iop,
const struct iovec *iov,
int iovcnt,
ssize_t total
)
{
test_state *state = IMFS_generic_get_context_by_iop(iop);
rtems_test_assert(*state == TEST_READV);
*state = TEST_WRITEV;
return 0;
}
static const rtems_filesystem_file_handlers_r node_handlers = {
.open_h = handler_open,
.close_h = handler_close,
@@ -213,7 +246,9 @@ static const rtems_filesystem_file_handlers_r node_handlers = {
.ftruncate_h = handler_ftruncate,
.fsync_h = handler_fsync,
.fdatasync_h = handler_fdatasync,
.fcntl_h = handler_fcntl
.fcntl_h = handler_fcntl,
.readv_h = handler_readv,
.writev_h = handler_writev
};
static IMFS_jnode_t *node_initialize(
@@ -269,6 +304,10 @@ static void test_imfs_make_generic_node(void)
char buf [1];
ssize_t n = 0;
off_t off = 0;
struct iovec iov = {
.iov_base = &buf [0],
.iov_len = (int) sizeof(buf)
};
rv = IMFS_make_generic_node(
path,
@@ -305,6 +344,12 @@ static void test_imfs_make_generic_node(void)
rv = fcntl(fd, F_GETFD);
rtems_test_assert(rv >= 0);
rv = readv(fd, &iov, 1);
rtems_test_assert(rv == 0);
rv = writev(fd, &iov, 1);
rtems_test_assert(rv == 0);
rv = close(fd);
rtems_test_assert(rv == 0);