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authorAl Viro <viro@zeniv.linux.org.uk>2014-02-05 10:14:01 -0500
committerAl Viro <viro@zeniv.linux.org.uk>2014-04-01 23:19:25 -0400
commit480402e18def5514c9dc8cb04e3c0e7482ff2b86 (patch)
tree905fa58d786565d9ee400102f2d1edfa1e0df1f5 /mm
parentec69557982563c97b3a7d68dd271be5105b83869 (diff)
untangling process_vm_..., part 1
we want to massage it to use of iov_iter. This one is an equivalent transformation - just introduce a local variable mirroring lvec + *lvec_current. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'mm')
-rw-r--r--mm/process_vm_access.c14
1 files changed, 9 insertions, 5 deletions
diff --git a/mm/process_vm_access.c b/mm/process_vm_access.c
index fd26d0433509..7b8d63e6c30b 100644
--- a/mm/process_vm_access.c
+++ b/mm/process_vm_access.c
@@ -60,6 +60,7 @@ static int process_vm_rw_pages(struct task_struct *task,
int ret;
ssize_t bytes_to_copy;
ssize_t rc = 0;
+ const struct iovec *iov = lvec + *lvec_current;
*bytes_copied = 0;
@@ -81,8 +82,10 @@ static int process_vm_rw_pages(struct task_struct *task,
pgs_copied++) {
/* Make sure we have a non zero length iovec */
while (*lvec_current < lvec_cnt
- && lvec[*lvec_current].iov_len == 0)
+ && iov->iov_len == 0) {
+ iov++;
(*lvec_current)++;
+ }
if (*lvec_current == lvec_cnt)
break;
@@ -94,18 +97,18 @@ static int process_vm_rw_pages(struct task_struct *task,
bytes_to_copy = min_t(ssize_t, PAGE_SIZE - start_offset,
len - *bytes_copied);
bytes_to_copy = min_t(ssize_t, bytes_to_copy,
- lvec[*lvec_current].iov_len
+ iov->iov_len
- *lvec_offset);
target_kaddr = kmap(process_pages[pgs_copied]) + start_offset;
if (vm_write)
ret = copy_from_user(target_kaddr,
- lvec[*lvec_current].iov_base
+ iov->iov_base
+ *lvec_offset,
bytes_to_copy);
else
- ret = copy_to_user(lvec[*lvec_current].iov_base
+ ret = copy_to_user(iov->iov_base
+ *lvec_offset,
target_kaddr, bytes_to_copy);
kunmap(process_pages[pgs_copied]);
@@ -117,12 +120,13 @@ static int process_vm_rw_pages(struct task_struct *task,
}
*bytes_copied += bytes_to_copy;
*lvec_offset += bytes_to_copy;
- if (*lvec_offset == lvec[*lvec_current].iov_len) {
+ if (*lvec_offset == iov->iov_len) {
/*
* Need to copy remaining part of page into the
* next iovec if there are any bytes left in page
*/
(*lvec_current)++;
+ iov++;
*lvec_offset = 0;
start_offset = (start_offset + bytes_to_copy)
% PAGE_SIZE;