summaryrefslogtreecommitdiffstats
path: root/lib/iov_iter.c
diff options
context:
space:
mode:
Diffstat (limited to 'lib/iov_iter.c')
-rw-r--r--lib/iov_iter.c182
1 files changed, 91 insertions, 91 deletions
diff --git a/lib/iov_iter.c b/lib/iov_iter.c
index 0e04abe9ec49..f4ea04e24e06 100644
--- a/lib/iov_iter.c
+++ b/lib/iov_iter.c
@@ -17,86 +17,86 @@
#define PIPE_PARANOIA /* for now */
/* covers iovec and kvec alike */
-#define iterate_iovec(i, n, __v, __off, __p, skip, STEP) { \
- size_t __off = 0; \
+#define iterate_iovec(i, n, base, len, off, __p, skip, STEP) { \
+ size_t off = 0; \
do { \
- __v.iov_len = min(n, __p->iov_len - skip); \
- if (likely(__v.iov_len)) { \
- __v.iov_base = __p->iov_base + skip; \
- __v.iov_len -= (STEP); \
- __off += __v.iov_len; \
- skip += __v.iov_len; \
- n -= __v.iov_len; \
+ len = min(n, __p->iov_len - skip); \
+ if (likely(len)) { \
+ base = __p->iov_base + skip; \
+ len -= (STEP); \
+ off += len; \
+ skip += len; \
+ n -= len; \
if (skip < __p->iov_len) \
break; \
} \
__p++; \
skip = 0; \
} while (n); \
- n = __off; \
+ n = off; \
}
-#define iterate_bvec(i, n, __v, __off, p, skip, STEP) { \
- size_t __off = 0; \
+#define iterate_bvec(i, n, base, len, off, p, skip, STEP) { \
+ size_t off = 0; \
while (n) { \
unsigned offset = p->bv_offset + skip; \
unsigned left; \
void *kaddr = kmap_local_page(p->bv_page + \
offset / PAGE_SIZE); \
- __v.iov_base = kaddr + offset % PAGE_SIZE; \
- __v.iov_len = min(min(n, p->bv_len - skip), \
+ base = kaddr + offset % PAGE_SIZE; \
+ len = min(min(n, p->bv_len - skip), \
(size_t)(PAGE_SIZE - offset % PAGE_SIZE)); \
left = (STEP); \
kunmap_local(kaddr); \
- __v.iov_len -= left; \
- __off += __v.iov_len; \
- skip += __v.iov_len; \
+ len -= left; \
+ off += len; \
+ skip += len; \
if (skip == p->bv_len) { \
skip = 0; \
p++; \
} \
- n -= __v.iov_len; \
+ n -= len; \
if (left) \
break; \
} \
- n = __off; \
+ n = off; \
}
-#define iterate_xarray(i, n, __v, __off, skip, STEP) { \
+#define iterate_xarray(i, n, base, len, __off, skip, STEP) { \
__label__ __out; \
size_t __off = 0; \
struct page *head = NULL; \
- size_t seg, offset; \
+ size_t offset; \
loff_t start = i->xarray_start + skip; \
pgoff_t index = start >> PAGE_SHIFT; \
int j; \
\
XA_STATE(xas, i->xarray, index); \
\
- rcu_read_lock(); \
- xas_for_each(&xas, head, ULONG_MAX) { \
- unsigned left; \
- if (xas_retry(&xas, head)) \
- continue; \
- if (WARN_ON(xa_is_value(head))) \
- break; \
- if (WARN_ON(PageHuge(head))) \
- break; \
+ rcu_read_lock(); \
+ xas_for_each(&xas, head, ULONG_MAX) { \
+ unsigned left; \
+ if (xas_retry(&xas, head)) \
+ continue; \
+ if (WARN_ON(xa_is_value(head))) \
+ break; \
+ if (WARN_ON(PageHuge(head))) \
+ break; \
for (j = (head->index < index) ? index - head->index : 0; \
- j < thp_nr_pages(head); j++) { \
+ j < thp_nr_pages(head); j++) { \
void *kaddr = kmap_local_page(head + j); \
- offset = (start + __off) % PAGE_SIZE; \
- __v.iov_base = kaddr + offset; \
- seg = PAGE_SIZE - offset; \
- __v.iov_len = min(n, seg); \
- left = (STEP); \
- kunmap_local(kaddr); \
- __v.iov_len -= left; \
- __off += __v.iov_len; \
- n -= __v.iov_len; \
- if (left || n == 0) \
- goto __out; \
- } \
+ offset = (start + __off) % PAGE_SIZE; \
+ base = kaddr + offset; \
+ len = PAGE_SIZE - offset; \
+ len = min(n, len); \
+ left = (STEP); \
+ kunmap_local(kaddr); \
+ len -= left; \
+ __off += len; \
+ n -= len; \
+ if (left || n == 0) \
+ goto __out; \
+ } \
} \
__out: \
rcu_read_unlock(); \
@@ -104,39 +104,47 @@ __out: \
n = __off; \
}
-#define __iterate_and_advance(i, n, v, off, I, K) { \
+#define __iterate_and_advance(i, n, base, len, off, I, K) { \
if (unlikely(i->count < n)) \
n = i->count; \
if (likely(n)) { \
size_t skip = i->iov_offset; \
if (likely(iter_is_iovec(i))) { \
const struct iovec *iov = i->iov; \
- struct iovec v; \
- iterate_iovec(i, n, v, off, iov, skip, (I)) \
+ void __user *base; \
+ size_t len; \
+ iterate_iovec(i, n, base, len, off, \
+ iov, skip, (I)) \
i->nr_segs -= iov - i->iov; \
i->iov = iov; \
} else if (iov_iter_is_bvec(i)) { \
const struct bio_vec *bvec = i->bvec; \
- struct kvec v; \
- iterate_bvec(i, n, v, off, bvec, skip, (K)) \
+ void *base; \
+ size_t len; \
+ iterate_bvec(i, n, base, len, off, \
+ bvec, skip, (K)) \
i->nr_segs -= bvec - i->bvec; \
i->bvec = bvec; \
} else if (iov_iter_is_kvec(i)) { \
const struct kvec *kvec = i->kvec; \
- struct kvec v; \
- iterate_iovec(i, n, v, off, kvec, skip, (K)) \
+ void *base; \
+ size_t len; \
+ iterate_iovec(i, n, base, len, off, \
+ kvec, skip, (K)) \
i->nr_segs -= kvec - i->kvec; \
i->kvec = kvec; \
} else if (iov_iter_is_xarray(i)) { \
- struct kvec v; \
- iterate_xarray(i, n, v, off, skip, (K)) \
+ void *base; \
+ size_t len; \
+ iterate_xarray(i, n, base, len, off, \
+ skip, (K)) \
} \
i->count -= n; \
i->iov_offset = skip; \
} \
}
-#define iterate_and_advance(i, n, v, off, I, K) \
- __iterate_and_advance(i, n, v, off, I, ((void)(K),0))
+#define iterate_and_advance(i, n, base, len, off, I, K) \
+ __iterate_and_advance(i, n, base, len, off, I, ((void)(K),0))
static int copyout(void __user *to, const void *from, size_t n)
{
@@ -613,9 +621,9 @@ size_t _copy_to_iter(const void *addr, size_t bytes, struct iov_iter *i)
return copy_pipe_to_iter(addr, bytes, i);
if (iter_is_iovec(i))
might_fault();
- iterate_and_advance(i, bytes, v, off,
- copyout(v.iov_base, addr + off, v.iov_len),
- memcpy(v.iov_base, addr + off, v.iov_len)
+ iterate_and_advance(i, bytes, base, len, off,
+ copyout(base, addr + off, len),
+ memcpy(base, addr + off, len)
)
return bytes;
@@ -708,9 +716,9 @@ size_t _copy_mc_to_iter(const void *addr, size_t bytes, struct iov_iter *i)
return copy_mc_pipe_to_iter(addr, bytes, i);
if (iter_is_iovec(i))
might_fault();
- __iterate_and_advance(i, bytes, v, off,
- copyout_mc(v.iov_base, addr + off, v.iov_len),
- copy_mc_to_kernel(v.iov_base, addr + off, v.iov_len)
+ __iterate_and_advance(i, bytes, base, len, off,
+ copyout_mc(base, addr + off, len),
+ copy_mc_to_kernel(base, addr + off, len)
)
return bytes;
@@ -726,9 +734,9 @@ size_t _copy_from_iter(void *addr, size_t bytes, struct iov_iter *i)
}
if (iter_is_iovec(i))
might_fault();
- iterate_and_advance(i, bytes, v, off,
- copyin(addr + off, v.iov_base, v.iov_len),
- memcpy(addr + off, v.iov_base, v.iov_len)
+ iterate_and_advance(i, bytes, base, len, off,
+ copyin(addr + off, base, len),
+ memcpy(addr + off, base, len)
)
return bytes;
@@ -741,10 +749,9 @@ size_t _copy_from_iter_nocache(void *addr, size_t bytes, struct iov_iter *i)
WARN_ON(1);
return 0;
}
- iterate_and_advance(i, bytes, v, off,
- __copy_from_user_inatomic_nocache(addr + off,
- v.iov_base, v.iov_len),
- memcpy(addr + off, v.iov_base, v.iov_len)
+ iterate_and_advance(i, bytes, base, len, off,
+ __copy_from_user_inatomic_nocache(addr + off, base, len),
+ memcpy(addr + off, base, len)
)
return bytes;
@@ -772,9 +779,9 @@ size_t _copy_from_iter_flushcache(void *addr, size_t bytes, struct iov_iter *i)
WARN_ON(1);
return 0;
}
- iterate_and_advance(i, bytes, v, off,
- __copy_from_user_flushcache(addr + off, v.iov_base, v.iov_len),
- memcpy_flushcache(addr + off, v.iov_base, v.iov_len)
+ iterate_and_advance(i, bytes, base, len, off,
+ __copy_from_user_flushcache(addr + off, base, len),
+ memcpy_flushcache(addr + off, base, len)
)
return bytes;
@@ -903,9 +910,9 @@ size_t iov_iter_zero(size_t bytes, struct iov_iter *i)
{
if (unlikely(iov_iter_is_pipe(i)))
return pipe_zero(bytes, i);
- iterate_and_advance(i, bytes, v, count,
- clear_user(v.iov_base, v.iov_len),
- memset(v.iov_base, 0, v.iov_len)
+ iterate_and_advance(i, bytes, base, len, count,
+ clear_user(base, len),
+ memset(base, 0, len)
)
return bytes;
@@ -925,9 +932,9 @@ size_t copy_page_from_iter_atomic(struct page *page, unsigned offset, size_t byt
WARN_ON(1);
return 0;
}
- iterate_and_advance(i, bytes, v, off,
- copyin(p + off, v.iov_base, v.iov_len),
- memcpy(p + off, v.iov_base, v.iov_len)
+ iterate_and_advance(i, bytes, base, len, off,
+ copyin(p + off, base, len),
+ memcpy(p + off, base, len)
)
kunmap_atomic(kaddr);
return bytes;
@@ -1654,16 +1661,13 @@ size_t csum_and_copy_from_iter(void *addr, size_t bytes, __wsum *csum,
WARN_ON(1);
return 0;
}
- iterate_and_advance(i, bytes, v, off, ({
- next = csum_and_copy_from_user(v.iov_base,
- addr + off,
- v.iov_len);
+ iterate_and_advance(i, bytes, base, len, off, ({
+ next = csum_and_copy_from_user(base, addr + off, len);
if (next)
sum = csum_block_add(sum, next, off);
- next ? 0 : v.iov_len;
+ next ? 0 : len;
}), ({
- sum = csum_and_memcpy(addr + off, v.iov_base, v.iov_len,
- sum, off);
+ sum = csum_and_memcpy(addr + off, base, len, sum, off);
})
)
*csum = sum;
@@ -1685,17 +1689,13 @@ size_t csum_and_copy_to_iter(const void *addr, size_t bytes, void *_csstate,
WARN_ON(1); /* for now */
return 0;
}
- iterate_and_advance(i, bytes, v, off, ({
- next = csum_and_copy_to_user(addr + off,
- v.iov_base,
- v.iov_len);
+ iterate_and_advance(i, bytes, base, len, off, ({
+ next = csum_and_copy_to_user(addr + off, base, len);
if (next)
sum = csum_block_add(sum, next, off);
- next ? 0 : v.iov_len;
+ next ? 0 : len;
}), ({
- sum = csum_and_memcpy(v.iov_base,
- addr + off,
- v.iov_len, sum, off);
+ sum = csum_and_memcpy(base, addr + off, len, sum, off);
})
)
csstate->csum = csum_shift(sum, csstate->off);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-21 03:56:28 +0100