Merge master.kernel.org:/home/rmk/linux-2.6-arm

[sfrench/cifs-2.6.git] / fs / ntfs / file.c

diff --git a/fs/ntfs/file.c b/fs/ntfs/file.c
index 36e1e136bb0c65bbdf21f0b8b19602c14964dfa1..2e42c2dcae12310d123c13642809219c5cb51126 100644 (file)
--- a/fs/ntfs/file.c
+++ b/fs/ntfs/file.c
@@ -231,8 +231,7 @@ do_non_resident_extend:
                 * Read the page.  If the page is not present, this will zero
                 * the uninitialized regions for us.
                 */
-               page = read_cache_page(mapping, index,
-                               (filler_t*)mapping->a_ops->readpage, NULL);
+               page = read_mapping_page(mapping, index, NULL);
                if (IS_ERR(page)) {
                        err = PTR_ERR(page);
                        goto init_err_out;
@@ -1359,7 +1358,7 @@ err_out:
        goto out;
 }
 
-static size_t __ntfs_copy_from_user_iovec(char *vaddr,
+static size_t __ntfs_copy_from_user_iovec_inatomic(char *vaddr,
                const struct iovec *iov, size_t iov_ofs, size_t bytes)
 {
        size_t total = 0;
@@ -1377,10 +1376,6 @@ static size_t __ntfs_copy_from_user_iovec(char *vaddr,
                bytes -= len;
                vaddr += len;
                if (unlikely(left)) {
-                       /*
-                        * Zero the rest of the target like __copy_from_user().
-                        */
-                       memset(vaddr, 0, bytes);
                        total -= left;
                        break;
                }
@@ -1421,11 +1416,13 @@ static inline void ntfs_set_next_iovec(const struct iovec **iovp,
  * pages (out to offset + bytes), to emulate ntfs_copy_from_user()'s
  * single-segment behaviour.
  *
- * We call the same helper (__ntfs_copy_from_user_iovec()) both when atomic and
- * when not atomic.  This is ok because __ntfs_copy_from_user_iovec() calls
- * __copy_from_user_inatomic() and it is ok to call this when non-atomic.  In
- * fact, the only difference between __copy_from_user_inatomic() and
- * __copy_from_user() is that the latter calls might_sleep().  And on many
+ * We call the same helper (__ntfs_copy_from_user_iovec_inatomic()) both
+ * when atomic and when not atomic.  This is ok because
+ * __ntfs_copy_from_user_iovec_inatomic() calls __copy_from_user_inatomic()
+ * and it is ok to call this when non-atomic.
+ * Infact, the only difference between __copy_from_user_inatomic() and
+ * __copy_from_user() is that the latter calls might_sleep() and the former
+ * should not zero the tail of the buffer on error.  And on many
  * architectures __copy_from_user_inatomic() is just defined to
  * __copy_from_user() so it makes no difference at all on those architectures.
  */
@@ -1442,14 +1439,18 @@ static inline size_t ntfs_copy_from_user_iovec(struct page **pages,
                if (len > bytes)
                        len = bytes;
                kaddr = kmap_atomic(*pages, KM_USER0);
-               copied = __ntfs_copy_from_user_iovec(kaddr + ofs,
+               copied = __ntfs_copy_from_user_iovec_inatomic(kaddr + ofs,
                                *iov, *iov_ofs, len);
                kunmap_atomic(kaddr, KM_USER0);
                if (unlikely(copied != len)) {
                        /* Do it the slow way. */
                        kaddr = kmap(*pages);
-                       copied = __ntfs_copy_from_user_iovec(kaddr + ofs,
+                       copied = __ntfs_copy_from_user_iovec_inatomic(kaddr + ofs,
                                        *iov, *iov_ofs, len);
+                       /*
+                        * Zero the rest of the target like __copy_from_user().
+                        */
+                       memset(kaddr + ofs + copied, 0, len - copied);
                        kunmap(*pages);
                        if (unlikely(copied != len))
                                goto err_out;