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authorAnton Ivanov <aivanov@brocade.com>2015-12-21 18:54:00 +0000
committerRichard Weinberger <richard@nod.at>2016-01-10 21:49:48 +0100
commit8c6157b6b30a765ec233a1be5f9446f24a5283de (patch)
tree81128a9f0252bd4075b6093cf5408eab19d45ce4 /arch/um/drivers
parent470a166e8c5a4da4be88545b1c4dde308abac5b2 (diff)
um: Update UBD to use pread/pwrite family of functions
This decreases the number of syscalls per read/write by half. Signed-off-by: Anton Ivanov <aivanov@brocade.com> Signed-off-by: Richard Weinberger <richard@nod.at>
Diffstat (limited to 'arch/um/drivers')
-rw-r--r--arch/um/drivers/ubd_kern.c27
1 files changed, 5 insertions, 22 deletions
diff --git a/arch/um/drivers/ubd_kern.c b/arch/um/drivers/ubd_kern.c
index e8ab93c3e638..39ba20755e03 100644
--- a/arch/um/drivers/ubd_kern.c
+++ b/arch/um/drivers/ubd_kern.c
@@ -535,11 +535,7 @@ static int read_cow_bitmap(int fd, void *buf, int offset, int len)
{
int err;
- err = os_seek_file(fd, offset);
- if (err < 0)
- return err;
-
- err = os_read_file(fd, buf, len);
+ err = os_pread_file(fd, buf, len, offset);
if (err < 0)
return err;
@@ -1377,14 +1373,8 @@ static int update_bitmap(struct io_thread_req *req)
if(req->cow_offset == -1)
return 0;
- n = os_seek_file(req->fds[1], req->cow_offset);
- if(n < 0){
- printk("do_io - bitmap lseek failed : err = %d\n", -n);
- return 1;
- }
-
- n = os_write_file(req->fds[1], &req->bitmap_words,
- sizeof(req->bitmap_words));
+ n = os_pwrite_file(req->fds[1], &req->bitmap_words,
+ sizeof(req->bitmap_words), req->cow_offset);
if(n != sizeof(req->bitmap_words)){
printk("do_io - bitmap update failed, err = %d fd = %d\n", -n,
req->fds[1]);
@@ -1399,7 +1389,6 @@ static void do_io(struct io_thread_req *req)
char *buf;
unsigned long len;
int n, nsectors, start, end, bit;
- int err;
__u64 off;
if (req->op == UBD_FLUSH) {
@@ -1428,18 +1417,12 @@ static void do_io(struct io_thread_req *req)
len = (end - start) * req->sectorsize;
buf = &req->buffer[start * req->sectorsize];
- err = os_seek_file(req->fds[bit], off);
- if(err < 0){
- printk("do_io - lseek failed : err = %d\n", -err);
- req->error = 1;
- return;
- }
if(req->op == UBD_READ){
n = 0;
do {
buf = &buf[n];
len -= n;
- n = os_read_file(req->fds[bit], buf, len);
+ n = os_pread_file(req->fds[bit], buf, len, off);
if (n < 0) {
printk("do_io - read failed, err = %d "
"fd = %d\n", -n, req->fds[bit]);
@@ -1449,7 +1432,7 @@ static void do_io(struct io_thread_req *req)
} while((n < len) && (n != 0));
if (n < len) memset(&buf[n], 0, len - n);
} else {
- n = os_write_file(req->fds[bit], buf, len);
+ n = os_pwrite_file(req->fds[bit], buf, len, off);
if(n != len){
printk("do_io - write failed err = %d "
"fd = %d\n", -n, req->fds[bit]);