mirror of
https://github.com/Divested-Mobile/DivestOS-Build.git
synced 2024-10-01 01:35:54 -04:00
153 lines
3.8 KiB
Diff
153 lines
3.8 KiB
Diff
diff --git a/fs/pipe.c b/fs/pipe.c
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index 125f32f..a6321e0 100644
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--- a/fs/pipe.c
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+++ b/fs/pipe.c
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@@ -104,25 +104,27 @@
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}
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static int
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-pipe_iov_copy_from_user(void *to, struct iovec *iov, unsigned long len,
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- int atomic)
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+pipe_iov_copy_from_user(void *addr, int *offset, struct iovec *iov,
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+ size_t *remaining, int atomic)
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{
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unsigned long copy;
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- while (len > 0) {
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+ while (*remaining > 0) {
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while (!iov->iov_len)
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iov++;
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- copy = min_t(unsigned long, len, iov->iov_len);
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+ copy = min_t(unsigned long, *remaining, iov->iov_len);
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if (atomic) {
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- if (__copy_from_user_inatomic(to, iov->iov_base, copy))
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+ if (__copy_from_user_inatomic(addr + *offset,
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+ iov->iov_base, copy))
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return -EFAULT;
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} else {
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- if (copy_from_user(to, iov->iov_base, copy))
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+ if (copy_from_user(addr + *offset,
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+ iov->iov_base, copy))
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return -EFAULT;
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}
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- to += copy;
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- len -= copy;
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+ *offset += copy;
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+ *remaining -= copy;
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iov->iov_base += copy;
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iov->iov_len -= copy;
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}
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@@ -130,25 +132,27 @@
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}
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static int
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-pipe_iov_copy_to_user(struct iovec *iov, const void *from, unsigned long len,
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- int atomic)
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+pipe_iov_copy_to_user(struct iovec *iov, void *addr, int *offset,
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+ size_t *remaining, int atomic)
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{
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unsigned long copy;
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- while (len > 0) {
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+ while (*remaining > 0) {
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while (!iov->iov_len)
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iov++;
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- copy = min_t(unsigned long, len, iov->iov_len);
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+ copy = min_t(unsigned long, *remaining, iov->iov_len);
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if (atomic) {
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- if (__copy_to_user_inatomic(iov->iov_base, from, copy))
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+ if (__copy_to_user_inatomic(iov->iov_base,
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+ addr + *offset, copy))
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return -EFAULT;
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} else {
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- if (copy_to_user(iov->iov_base, from, copy))
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+ if (copy_to_user(iov->iov_base,
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+ addr + *offset, copy))
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return -EFAULT;
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}
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- from += copy;
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- len -= copy;
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+ *offset += copy;
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+ *remaining -= copy;
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iov->iov_base += copy;
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iov->iov_len -= copy;
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}
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@@ -384,7 +388,7 @@
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struct pipe_buffer *buf = pipe->bufs + curbuf;
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const struct pipe_buf_operations *ops = buf->ops;
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void *addr;
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- size_t chars = buf->len;
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+ size_t chars = buf->len, remaining;
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int error, atomic;
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if (chars > total_len)
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@@ -398,9 +402,11 @@
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}
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atomic = !iov_fault_in_pages_write(iov, chars);
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+ remaining = chars;
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redo:
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addr = ops->map(pipe, buf, atomic);
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- error = pipe_iov_copy_to_user(iov, addr + buf->offset, chars, atomic);
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+ error = pipe_iov_copy_to_user(iov, addr, &buf->offset,
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+ &remaining, atomic);
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ops->unmap(pipe, buf, addr);
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if (unlikely(error)) {
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/*
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@@ -415,7 +421,6 @@
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break;
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}
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ret += chars;
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- buf->offset += chars;
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buf->len -= chars;
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/* Was it a packet buffer? Clean up and exit */
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@@ -522,6 +527,7 @@
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if (ops->can_merge && offset + chars <= PAGE_SIZE) {
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int error, atomic = 1;
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void *addr;
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+ size_t remaining = chars;
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error = ops->confirm(pipe, buf);
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if (error)
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@@ -530,8 +536,8 @@
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iov_fault_in_pages_read(iov, chars);
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redo1:
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addr = ops->map(pipe, buf, atomic);
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- error = pipe_iov_copy_from_user(offset + addr, iov,
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- chars, atomic);
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+ error = pipe_iov_copy_from_user(addr, &offset, iov,
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+ &remaining, atomic);
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ops->unmap(pipe, buf, addr);
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ret = error;
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do_wakeup = 1;
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@@ -566,6 +572,8 @@
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struct page *page = pipe->tmp_page;
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char *src;
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int error, atomic = 1;
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+ int offset = 0;
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+ size_t remaining;
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if (!page) {
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page = alloc_page(GFP_HIGHUSER);
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@@ -586,14 +594,15 @@
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chars = total_len;
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iov_fault_in_pages_read(iov, chars);
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+ remaining = chars;
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redo2:
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if (atomic)
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src = kmap_atomic(page);
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else
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src = kmap(page);
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- error = pipe_iov_copy_from_user(src, iov, chars,
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- atomic);
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+ error = pipe_iov_copy_from_user(src, &offset, iov,
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+ &remaining, atomic);
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if (atomic)
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kunmap_atomic(src);
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else
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