ceph_sync_read: stop poking into iov_iter guts

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/ceph/file.c b/fs/ceph/file.c
index c9a24ba..672b0fe 100644 (file)
--- a/fs/ceph/file.c
+++ b/fs/ceph/file.c
@@ -418,7 +418,7 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
        struct page **pages;
        u64 off = iocb->ki_pos;
        int num_pages, ret;
-       size_t len = i->count;
+       size_t len = iov_iter_count(i);
 
        dout("sync_read on file %p %llu~%u %s\n", file, off,
             (unsigned)len,
@@ -436,25 +436,26 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
 
        if (file->f_flags & O_DIRECT) {
                while (iov_iter_count(i)) {
-                       void __user *data = i->iov[0].iov_base + i->iov_offset;
-                       size_t len = i->iov[0].iov_len - i->iov_offset;
+                       size_t start;
+                       ssize_t n;
 
-                       num_pages = calc_pages_for((unsigned long)data, len);
-                       pages = ceph_get_direct_page_vector(data,
-                                                           num_pages, true);
-                       if (IS_ERR(pages))
-                               return PTR_ERR(pages);
+                       n = iov_iter_get_pages_alloc(i, &pages, INT_MAX, &start);
+                       if (n < 0)
+                               return n;
 
-                       ret = striped_read(inode, off, len,
+                       num_pages = (n + start + PAGE_SIZE - 1) / PAGE_SIZE;
+
+                       ret = striped_read(inode, off, n,
                                           pages, num_pages, checkeof,
-                                          1, (unsigned long)data & ~PAGE_MASK);
+                                          1, start);
+
                        ceph_put_page_vector(pages, num_pages, true);
 
                        if (ret <= 0)
                                break;
                        off += ret;
                        iov_iter_advance(i, ret);
-                       if (ret < len)
+                       if (ret < n)
                                break;
                }
        } else {
@@ -466,25 +467,14 @@ static ssize_t ceph_sync_read(struct kiocb *iocb, struct iov_iter *i,
                                        num_pages, checkeof, 0, 0);
                if (ret > 0) {
                        int l, k = 0;
-                       size_t left = len = ret;
+                       size_t left = ret;
 
                        while (left) {
-                               void __user *data = i->iov[0].iov_base
-                                                       + i->iov_offset;
-                               l = min(i->iov[0].iov_len - i->iov_offset,
-                                       left);
-
-                               ret = ceph_copy_page_vector_to_user(&pages[k],
-                                                                   data, off,
-                                                                   l);
-                               if (ret > 0) {
-                                       iov_iter_advance(i, ret);
-                                       left -= ret;
-                                       off += ret;
-                                       k = calc_pages_for(iocb->ki_pos,
-                                                          len - left + 1) - 1;
-                                       BUG_ON(k >= num_pages && left);
-                               } else
+                               int copy = min_t(size_t, PAGE_SIZE, left);
+                               l = copy_page_to_iter(pages[k++], 0, copy, i);
+                               off += l;
+                               left -= l;
+                               if (l < copy)
                                        break;
                        }
                }

diff --git a/include/linux/ceph/libceph.h b/include/linux/ceph/libceph.h
index 2f49aa4..279b0af 100644 (file)
--- a/include/linux/ceph/libceph.h
+++ b/include/linux/ceph/libceph.h
@@ -222,8 +222,6 @@ extern void ceph_copy_to_page_vector(struct page **pages,
 extern void ceph_copy_from_page_vector(struct page **pages,
                                    void *data,
                                    loff_t off, size_t len);
-extern int ceph_copy_page_vector_to_user(struct page **pages, void __user *data,
-                                   loff_t off, size_t len);
 extern void ceph_zero_page_vector_range(int off, int len, struct page **pages);
 
 

diff --git a/net/ceph/pagevec.c b/net/ceph/pagevec.c
index 815a224..5550130 100644 (file)
--- a/net/ceph/pagevec.c
+++ b/net/ceph/pagevec.c
@@ -53,7 +53,10 @@ void ceph_put_page_vector(struct page **pages, int num_pages, bool dirty)
                        set_page_dirty_lock(pages[i]);
                put_page(pages[i]);
        }
-       kfree(pages);
+       if (is_vmalloc_addr(pages))
+               vfree(pages);
+       else
+               kfree(pages);
 }
 EXPORT_SYMBOL(ceph_put_page_vector);
 
@@ -165,36 +168,6 @@ void ceph_copy_from_page_vector(struct page **pages,
 EXPORT_SYMBOL(ceph_copy_from_page_vector);
 
 /*
- * copy user data from a page vector into a user pointer
- */
-int ceph_copy_page_vector_to_user(struct page **pages,
-                                        void __user *data,
-                                        loff_t off, size_t len)
-{
-       int i = 0;
-       int po = off & ~PAGE_CACHE_MASK;
-       int left = len;
-       int l, bad;
-
-       while (left > 0) {
-               l = min_t(int, left, PAGE_CACHE_SIZE-po);
-               bad = copy_to_user(data, page_address(pages[i]) + po, l);
-               if (bad == l)
-                       return -EFAULT;
-               data += l - bad;
-               left -= l - bad;
-               if (po) {
-                       po += l - bad;
-                       if (po == PAGE_CACHE_SIZE)
-                               po = 0;
-               }
-               i++;
-       }
-       return len;
-}
-EXPORT_SYMBOL(ceph_copy_page_vector_to_user);
-
-/*
  * Zero an extent within a page vector.  Offset is relative to the
  * start of the first page.
  */