30 files changed, 116 insertions, 69 deletions

diff --git a/Documentation/filesystems/Locking b/Documentation/filesystems/Locking
index 0706d32a61e6..cbbac3fa0eb4 100644
--- a/Documentation/filesystems/Locking
+++ b/Documentation/filesystems/Locking
@@ -189,7 +189,7 @@ prototypes:
                                 loff_t pos, unsigned len, unsigned copied,
                                 struct page *page, void *fsdata);
         sector_t (*bmap)(struct address_space *, sector_t);
-        int (*invalidatepage) (struct page *, unsigned long);
+        void (*invalidatepage) (struct page *, unsigned int, unsigned int);
         int (*releasepage) (struct page *, int);
         void (*freepage)(struct page *);
         int (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
@@ -310,8 +310,8 @@ filesystems and by the swapper. The latter will eventually go away.  Please,
 keep it that way and don't breed new callers.
 
         ->invalidatepage() is called when the filesystem must attempt to drop
-some or all of the buffers from the page when it is being truncated.  It
-returns zero on success.  If ->invalidatepage is zero, the kernel uses
+some or all of the buffers from the page when it is being truncated. It
+returns zero on success. If ->invalidatepage is zero, the kernel uses
 block_invalidatepage() instead.
 
         ->releasepage() is called when the kernel is about to try to drop the
diff --git a/Documentation/filesystems/vfs.txt b/Documentation/filesystems/vfs.txt
index bc4b06b3160a..e445b95a002b 100644
--- a/Documentation/filesystems/vfs.txt
+++ b/Documentation/filesystems/vfs.txt
@@ -549,7 +549,7 @@ struct address_space_operations
 -------------------------------
 
 This describes how the VFS can manipulate mapping of a file to page cache in
-your filesystem. As of kernel 2.6.22, the following members are defined:
+your filesystem. The following members are defined:
 
 struct address_space_operations {
         int (*writepage)(struct page *page, struct writeback_control *wbc);
@@ -566,7 +566,7 @@ struct address_space_operations {
                                 loff_t pos, unsigned len, unsigned copied,
                                 struct page *page, void *fsdata);
         sector_t (*bmap)(struct address_space *, sector_t);
-        int (*invalidatepage) (struct page *, unsigned long);
+        void (*invalidatepage) (struct page *, unsigned int, unsigned int);
         int (*releasepage) (struct page *, int);
         void (*freepage)(struct page *);
         ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
@@ -685,14 +685,14 @@ struct address_space_operations {
   invalidatepage: If a page has PagePrivate set, then invalidatepage
         will be called when part or all of the page is to be removed
         from the address space.  This generally corresponds to either a
-        truncation or a complete invalidation of the address space
-        (in the latter case 'offset' will always be 0).
-        Any private data associated with the page should be updated
-        to reflect this truncation.  If offset is 0, then
-        the private data should be released, because the page
-        must be able to be completely discarded.  This may be done by
-        calling the ->releasepage function, but in this case the
-        release MUST succeed.
+        truncation, punch hole  or a complete invalidation of the address
+        space (in the latter case 'offset' will always be 0 and 'length'
+        will be PAGE_CACHE_SIZE). Any private data associated with the page
+        should be updated to reflect this truncation.  If offset is 0 and
+        length is PAGE_CACHE_SIZE, then the private data should be released,
+        because the page must be able to be completely discarded.  This may
+        be done by calling the ->releasepage function, but in this case the
+        release MUST succeed.
 
   releasepage: releasepage is called on PagePrivate pages to indicate
         that the page should be freed if possible.  ->releasepage
diff --git a/fs/9p/vfs_addr.c b/fs/9p/vfs_addr.c
index 055562c580b4..9ff073f4090a 100644
--- a/fs/9p/vfs_addr.c
+++ b/fs/9p/vfs_addr.c
@@ -148,13 +148,14 @@ static int v9fs_release_page(struct page *page, gfp_t gfp)
  * @offset: offset in the page
  */
 
-static void v9fs_invalidate_page(struct page *page, unsigned long offset)
+static void v9fs_invalidate_page(struct page *page, unsigned int offset,
+                                 unsigned int length)
 {
         /*
          * If called with zero offset, we should release
          * the private state assocated with the page
          */
-        if (offset == 0)
+        if (offset == 0 && length == PAGE_CACHE_SIZE)
                 v9fs_fscache_invalidate_page(page);
 }
 
diff --git a/fs/afs/file.c b/fs/afs/file.c
index 8f6e9234d565..66d50fe2ee45 100644
--- a/fs/afs/file.c
+++ b/fs/afs/file.c
@@ -19,7 +19,8 @@
 #include "internal.h"
 
 static int afs_readpage(struct file *file, struct page *page);
-static void afs_invalidatepage(struct page *page, unsigned long offset);
+static void afs_invalidatepage(struct page *page, unsigned int offset,
+                               unsigned int length);
 static int afs_releasepage(struct page *page, gfp_t gfp_flags);
 static int afs_launder_page(struct page *page);
 
@@ -310,16 +311,17 @@ static int afs_launder_page(struct page *page)
  * - release a page and clean up its private data if offset is 0 (indicating
  *   the entire page)
  */
-static void afs_invalidatepage(struct page *page, unsigned long offset)
+static void afs_invalidatepage(struct page *page, unsigned int offset,
+                               unsigned int length)
 {
         struct afs_writeback *wb = (struct afs_writeback *) page_private(page);
 
-        _enter("{%lu},%lu", page->index, offset);
+        _enter("{%lu},%u,%u", page->index, offset, length);
 
         BUG_ON(!PageLocked(page));
 
         /* we clean up only if the entire page is being invalidated */
-        if (offset == 0) {
+        if (offset == 0 && length == PAGE_CACHE_SIZE) {
 #ifdef CONFIG_AFS_FSCACHE
                 if (PageFsCache(page)) {
                         struct afs_vnode *vnode = AFS_FS_I(page->mapping->host);
diff --git a/fs/btrfs/disk-io.c b/fs/btrfs/disk-io.c
index e7b3cb5286a5..40c7bc300075 100644
--- a/fs/btrfs/disk-io.c
+++ b/fs/btrfs/disk-io.c
@@ -1013,7 +1013,8 @@ static int btree_releasepage(struct page *page, gfp_t gfp_flags)
         return try_release_extent_buffer(page);
 }
 
-static void btree_invalidatepage(struct page *page, unsigned long offset)
+static void btree_invalidatepage(struct page *page, unsigned int offset,
+                                 unsigned int length)
 {
         struct extent_io_tree *tree;
         tree = &BTRFS_I(page->mapping->host)->io_tree;
diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index e7e7afb4a872..6bca9472f313 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -2957,7 +2957,7 @@ static int __extent_writepage(struct page *page, struct writeback_control *wbc,
         pg_offset = i_size & (PAGE_CACHE_SIZE - 1);
         if (page->index > end_index ||
            (page->index == end_index && !pg_offset)) {
-                page->mapping->a_ops->invalidatepage(page, 0);
+                page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE);
                 unlock_page(page);
                 return 0;
         }
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index af978f7682b3..db57e6384fbb 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -7510,7 +7510,8 @@ static int btrfs_releasepage(struct page *page, gfp_t gfp_flags)
         return __btrfs_releasepage(page, gfp_flags & GFP_NOFS);
 }
 
-static void btrfs_invalidatepage(struct page *page, unsigned long offset)
+static void btrfs_invalidatepage(struct page *page, unsigned int offset,
+                                 unsigned int length)
 {
         struct inode *inode = page->mapping->host;
         struct extent_io_tree *tree;
diff --git a/fs/buffer.c b/fs/buffer.c
index d2a4d1bb2d57..f93392e2df12 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -1454,7 +1454,8 @@ static void discard_buffer(struct buffer_head * bh)
  * block_invalidatepage - invalidate part or all of a buffer-backed page
  *
  * @page: the page which is affected
- * @offset: the index of the truncation point
+ * @offset: start of the range to invalidate
+ * @length: length of the range to invalidate
  *
  * block_invalidatepage() is called when all or part of the page has become
  * invalidated by a truncate operation.
@@ -1465,15 +1466,22 @@ static void discard_buffer(struct buffer_head * bh)
  * point.  Because the caller is about to free (and possibly reuse) those
  * blocks on-disk.
  */
-void block_invalidatepage(struct page *page, unsigned long offset)
+void block_invalidatepage(struct page *page, unsigned int offset,
+                          unsigned int length)
 {
         struct buffer_head *head, *bh, *next;
         unsigned int curr_off = 0;
+        unsigned int stop = length + offset;
 
         BUG_ON(!PageLocked(page));
         if (!page_has_buffers(page))
                 goto out;
 
+        /*
+         * Check for overflow
+         */
+        BUG_ON(stop > PAGE_CACHE_SIZE || stop < length);
+
         head = page_buffers(page);
         bh = head;
         do {
@@ -1481,6 +1489,12 @@ void block_invalidatepage(struct page *page, unsigned long offset)
                 next = bh->b_this_page;
 
                 /*
+                 * Are we still fully in range ?
+                 */
+                if (next_off > stop)
+                        goto out;
+
+                /*
                  * is this block fully invalidated?
                  */
                 if (offset <= curr_off)
@@ -1501,6 +1515,7 @@ out:
 }
 EXPORT_SYMBOL(block_invalidatepage);
 
+
 /*
  * We attach and possibly dirty the buffers atomically wrt
  * __set_page_dirty_buffers() via private_lock.  try_to_free_buffers
@@ -2841,7 +2856,7 @@ int block_write_full_page_endio(struct page *page, get_block_t *get_block,
                  * they may have been added in ext3_writepage().  Make them
                  * freeable here, so the page does not leak.
                  */
-                do_invalidatepage(page, 0);
+                do_invalidatepage(page, 0, PAGE_CACHE_SIZE);
                 unlock_page(page);
                 return 0; /* don't care */
         }
diff --git a/fs/ceph/addr.c b/fs/ceph/addr.c
index 3e68ac101040..b1899400df1f 100644
--- a/fs/ceph/addr.c
+++ b/fs/ceph/addr.c
@@ -143,7 +143,8 @@ static int ceph_set_page_dirty(struct page *page)
  * dirty page counters appropriately.  Only called if there is private
  * data on the page.
  */
-static void ceph_invalidatepage(struct page *page, unsigned long offset)
+static void ceph_invalidatepage(struct page *page, unsigned int offset,
+                                unsigned int length)
 {
         struct inode *inode;
         struct ceph_inode_info *ci;
@@ -168,7 +169,7 @@ static void ceph_invalidatepage(struct page *page, unsigned long offset)
 
         ci = ceph_inode(inode);
         if (offset == 0) {
-                dout("%p invalidatepage %p idx %lu full dirty page %lu\n",
+                dout("%p invalidatepage %p idx %lu full dirty page %u\n",
                      inode, page, page->index, offset);
                 ceph_put_wrbuffer_cap_refs(ci, 1, snapc);
                 ceph_put_snap_context(snapc);
diff --git a/fs/cifs/file.c b/fs/cifs/file.c
index 48b29d24c9f4..4d8ba8d491e5 100644
--- a/fs/cifs/file.c
+++ b/fs/cifs/file.c
@@ -3546,11 +3546,12 @@ static int cifs_release_page(struct page *page, gfp_t gfp)
         return cifs_fscache_release_page(page, gfp);
 }
 
-static void cifs_invalidate_page(struct page *page, unsigned long offset)
+static void cifs_invalidate_page(struct page *page, unsigned int offset,
+                                 unsigned int length)
 {
         struct cifsInodeInfo *cifsi = CIFS_I(page->mapping->host);
 
-        if (offset == 0)
+        if (offset == 0 && length == PAGE_CACHE_SIZE)
                 cifs_fscache_invalidate_page(page, &cifsi->vfs_inode);
 }
 
diff --git a/fs/exofs/inode.c b/fs/exofs/inode.c
index d1f80abd8828..2ec8eb1ab269 100644
--- a/fs/exofs/inode.c
+++ b/fs/exofs/inode.c
@@ -953,9 +953,11 @@ static int exofs_releasepage(struct page *page, gfp_t gfp)
         return 0;
 }
 
-static void exofs_invalidatepage(struct page *page, unsigned long offset)
+static void exofs_invalidatepage(struct page *page, unsigned int offset,
+                                 unsigned int length)
 {
-        EXOFS_DBGMSG("page 0x%lx offset 0x%lx\n", page->index, offset);
+        EXOFS_DBGMSG("page 0x%lx offset 0x%x length 0x%x\n",
+                     page->index, offset, length);
         WARN_ON(1);
 }
 
diff --git a/fs/ext3/inode.c b/fs/ext3/inode.c
index 23c712825640..b6e5934f5dd6 100644
--- a/fs/ext3/inode.c
+++ b/fs/ext3/inode.c
@@ -1825,7 +1825,8 @@ ext3_readpages(struct file *file, struct address_space *mapping,
         return mpage_readpages(mapping, pages, nr_pages, ext3_get_block);
 }
 
-static void ext3_invalidatepage(struct page *page, unsigned long offset)
+static void ext3_invalidatepage(struct page *page, unsigned int offset,
+                                unsigned int length)
 {
         journal_t *journal = EXT3_JOURNAL(page->mapping->host);
 
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index d6382b89ecbd..19d6ca27c879 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -132,7 +132,8 @@ static inline int ext4_begin_ordered_truncate(struct inode *inode,
                                                    new_size);
 }
 
-static void ext4_invalidatepage(struct page *page, unsigned long offset);
+static void ext4_invalidatepage(struct page *page, unsigned int offset,
+                                unsigned int length);
 static int __ext4_journalled_writepage(struct page *page, unsigned int len);
 static int ext4_bh_delay_or_unwritten(handle_t *handle, struct buffer_head *bh);
 static int ext4_discard_partial_page_buffers_no_lock(handle_t *handle,
@@ -1606,7 +1607,7 @@ static void ext4_da_block_invalidatepages(struct mpage_da_data *mpd)
                                 break;
                         BUG_ON(!PageLocked(page));
                         BUG_ON(PageWriteback(page));
-                        block_invalidatepage(page, 0);
+                        block_invalidatepage(page, 0, PAGE_CACHE_SIZE);
                         ClearPageUptodate(page);
                         unlock_page(page);
                 }
@@ -2829,7 +2830,8 @@ static int ext4_da_write_end(struct file *file,
         return ret ? ret : copied;
 }
 
-static void ext4_da_invalidatepage(struct page *page, unsigned long offset)
+static void ext4_da_invalidatepage(struct page *page, unsigned int offset,
+                                   unsigned int length)
 {
         /*
          * Drop reserved blocks
@@ -2841,7 +2843,7 @@ static void ext4_da_invalidatepage(struct page *page, unsigned long offset)
         ext4_da_page_release_reservation(page, offset);
 
 out:
-        ext4_invalidatepage(page, offset);
+        ext4_invalidatepage(page, offset, length);
 
         return;
 }
@@ -2989,14 +2991,15 @@ ext4_readpages(struct file *file, struct address_space *mapping,
         return mpage_readpages(mapping, pages, nr_pages, ext4_get_block);
 }
 
-static void ext4_invalidatepage(struct page *page, unsigned long offset)
+static void ext4_invalidatepage(struct page *page, unsigned int offset,
+                                unsigned int length)
 {
         trace_ext4_invalidatepage(page, offset);
 
         /* No journalling happens on data buffers when this function is used */
         WARN_ON(page_has_buffers(page) && buffer_jbd(page_buffers(page)));
 
-        block_invalidatepage(page, offset);
+        block_invalidatepage(page, offset, PAGE_CACHE_SIZE - offset);
 }
 
 static int __ext4_journalled_invalidatepage(struct page *page,
@@ -3017,7 +3020,8 @@ static int __ext4_journalled_invalidatepage(struct page *page,
 
 /* Wrapper for aops... */
 static void ext4_journalled_invalidatepage(struct page *page,
-                                           unsigned long offset)
+                                           unsigned int offset,
+                                           unsigned int length)
 {
         WARN_ON(__ext4_journalled_invalidatepage(page, offset) < 0);
 }
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c
index 91ff93b0b0f4..ce11d9a92aed 100644
--- a/fs/f2fs/data.c
+++ b/fs/f2fs/data.c
@@ -698,7 +698,8 @@ static ssize_t f2fs_direct_IO(int rw, struct kiocb *iocb,
                                                   get_data_block_ro);
 }
 
-static void f2fs_invalidate_data_page(struct page *page, unsigned long offset)
+static void f2fs_invalidate_data_page(struct page *page, unsigned int offset,
+                                      unsigned int length)
 {
         struct inode *inode = page->mapping->host;
         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index 3df43b4efd89..74f3c7b03eb2 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1205,7 +1205,8 @@ static int f2fs_set_node_page_dirty(struct page *page)
         return 0;
 }
 
-static void f2fs_invalidate_node_page(struct page *page, unsigned long offset)
+static void f2fs_invalidate_node_page(struct page *page, unsigned int offset,
+                                      unsigned int length)
 {
         struct inode *inode = page->mapping->host;
         struct f2fs_sb_info *sbi = F2FS_SB(inode->i_sb);
diff --git a/fs/gfs2/aops.c b/fs/gfs2/aops.c
index 0bad69ed6336..db0d39f9fba4 100644
--- a/fs/gfs2/aops.c
+++ b/fs/gfs2/aops.c
@@ -110,7 +110,7 @@ static int gfs2_writepage_common(struct page *page,
         /* Is the page fully outside i_size? (truncate in progress) */
         offset = i_size & (PAGE_CACHE_SIZE-1);
         if (page->index > end_index || (page->index == end_index && !offset)) {
-                page->mapping->a_ops->invalidatepage(page, 0);
+                page->mapping->a_ops->invalidatepage(page, 0, PAGE_CACHE_SIZE);
                 goto out;
         }
         return 1;
@@ -299,7 +299,8 @@ static int gfs2_write_jdata_pagevec(struct address_space *mapping,
 
                 /* Is the page fully outside i_size? (truncate in progress) */
                 if (page->index > end_index || (page->index == end_index && !offset)) {
-                        page->mapping->a_ops->invalidatepage(page, 0);
+                        page->mapping->a_ops->invalidatepage(page, 0,
+                                                             PAGE_CACHE_SIZE);
                         unlock_page(page);
                         continue;
                 }
@@ -943,7 +944,8 @@ static void gfs2_discard(struct gfs2_sbd *sdp, struct buffer_head *bh)
         unlock_buffer(bh);
 }
 
-static void gfs2_invalidatepage(struct page *page, unsigned long offset)
+static void gfs2_invalidatepage(struct page *page, unsigned int offset,
+                                unsigned int length)
 {
         struct gfs2_sbd *sdp = GFS2_SB(page->mapping->host);
         struct buffer_head *bh, *head;
diff --git a/fs/jfs/jfs_metapage.c b/fs/jfs/jfs_metapage.c
index 6740d34cd82b..9e3aaff11f89 100644
--- a/fs/jfs/jfs_metapage.c
+++ b/fs/jfs/jfs_metapage.c
@@ -571,9 +571,10 @@ static int metapage_releasepage(struct page *page, gfp_t gfp_mask)
         return ret;
 }
 
-static void metapage_invalidatepage(struct page *page, unsigned long offset)
+static void metapage_invalidatepage(struct page *page, unsigned int offset,
+                                    unsigned int length)
 {
-        BUG_ON(offset);
+        BUG_ON(offset || length < PAGE_CACHE_SIZE);
 
         BUG_ON(PageWriteback(page));
 
diff --git a/fs/logfs/file.c b/fs/logfs/file.c
index c2219a6dd3c8..57914fc32b62 100644
--- a/fs/logfs/file.c
+++ b/fs/logfs/file.c
@@ -159,7 +159,8 @@ static int logfs_writepage(struct page *page, struct writeback_control *wbc)
         return __logfs_writepage(page);
 }
 
-static void logfs_invalidatepage(struct page *page, unsigned long offset)
+static void logfs_invalidatepage(struct page *page, unsigned int offset,
+                                 unsigned int length)
 {
         struct logfs_block *block = logfs_block(page);
 
diff --git a/fs/logfs/segment.c b/fs/logfs/segment.c
index 038da0991794..d448a777166b 100644
--- a/fs/logfs/segment.c
+++ b/fs/logfs/segment.c
@@ -884,7 +884,8 @@ static struct logfs_area *alloc_area(struct super_block *sb)
         return area;
 }
 
-static void map_invalidatepage(struct page *page, unsigned long l)
+static void map_invalidatepage(struct page *page, unsigned int o,
+                               unsigned int l)
 {
         return;
 }
diff --git a/fs/nfs/file.c b/fs/nfs/file.c
index a87a44f84113..6b4a79f4ad1d 100644
--- a/fs/nfs/file.c
+++ b/fs/nfs/file.c
@@ -451,11 +451,13 @@ static int nfs_write_end(struct file *file, struct address_space *mapping,
  * - Called if either PG_private or PG_fscache is set on the page
  * - Caller holds page lock
  */
-static void nfs_invalidate_page(struct page *page, unsigned long offset)
+static void nfs_invalidate_page(struct page *page, unsigned int offset,
+                                unsigned int length)
 {
-        dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %lu)\n", page, offset);
+        dfprintk(PAGECACHE, "NFS: invalidate_page(%p, %u, %u)\n",
+                 page, offset, length);
 
-        if (offset != 0)
+        if (offset != 0 || length < PAGE_CACHE_SIZE)
                 return;
         /* Cancel any unstarted writes on this page */
         nfs_wb_page_cancel(page_file_mapping(page)->host, page);
diff --git a/fs/ntfs/aops.c b/fs/ntfs/aops.c
index fa9c05f97af4..d267ea6aa1a0 100644
--- a/fs/ntfs/aops.c
+++ b/fs/ntfs/aops.c
@@ -1372,7 +1372,7 @@ retry_writepage:
                  * The page may have dirty, unmapped buffers.  Make them
                  * freeable here, so the page does not leak.
                  */
-                block_invalidatepage(page, 0);
+                block_invalidatepage(page, 0, PAGE_CACHE_SIZE);
                 unlock_page(page);
                 ntfs_debug("Write outside i_size - truncated?");
                 return 0;
diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index 20dfec72e903..ecb86ca8b1f1 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -603,7 +603,8 @@ static void ocfs2_dio_end_io(struct kiocb *iocb,
  * from ext3.  PageChecked() bits have been removed as OCFS2 does not
  * do journalled data.
  */
-static void ocfs2_invalidatepage(struct page *page, unsigned long offset)
+static void ocfs2_invalidatepage(struct page *page, unsigned int offset,
+                                 unsigned int length)
 {
         journal_t *journal = OCFS2_SB(page->mapping->host->i_sb)->journal->j_journal;
 
diff --git a/fs/reiserfs/inode.c b/fs/reiserfs/inode.c
index 77d6d47abc83..278c86e3e6c4 100644
--- a/fs/reiserfs/inode.c
+++ b/fs/reiserfs/inode.c
@@ -2970,7 +2970,8 @@ static int invalidatepage_can_drop(struct inode *inode, struct buffer_head *bh)
 }
 
 /* clm -- taken from fs/buffer.c:block_invalidate_page */
-static void reiserfs_invalidatepage(struct page *page, unsigned long offset)
+static void reiserfs_invalidatepage(struct page *page, unsigned int offset,
+                                    unsigned int length)
 {
         struct buffer_head *head, *bh, *next;
         struct inode *inode = page->mapping->host;
diff --git a/fs/ubifs/file.c b/fs/ubifs/file.c
index 14374530784c..123c79b7261e 100644
--- a/fs/ubifs/file.c
+++ b/fs/ubifs/file.c
@@ -1277,13 +1277,14 @@ int ubifs_setattr(struct dentry *dentry, struct iattr *attr)
         return err;
 }
 
-static void ubifs_invalidatepage(struct page *page, unsigned long offset)
+static void ubifs_invalidatepage(struct page *page, unsigned int offset,
+                                 unsigned int length)
 {
         struct inode *inode = page->mapping->host;
         struct ubifs_info *c = inode->i_sb->s_fs_info;
 
         ubifs_assert(PagePrivate(page));
-        if (offset)
+        if (offset || length < PAGE_CACHE_SIZE)
                 /* Partial page remains dirty */
                 return;
 
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 2b2691b73428..a8f63f38b8f7 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -824,10 +824,11 @@ xfs_cluster_write(
 STATIC void
 xfs_vm_invalidatepage(
         struct page             *page,
-        unsigned long           offset)
+        unsigned int            offset,
+        unsigned int            length)
 {
         trace_xfs_invalidatepage(page->mapping->host, page, offset);
-        block_invalidatepage(page, offset);
+        block_invalidatepage(page, offset, PAGE_CACHE_SIZE - offset);
 }
 
 /*
@@ -891,7 +892,7 @@ next_buffer:
 
         xfs_iunlock(ip, XFS_ILOCK_EXCL);
 out_invalidate:
-        xfs_vm_invalidatepage(page, 0);
+        xfs_vm_invalidatepage(page, 0, PAGE_CACHE_SIZE);
         return;
 }
 
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 9e52b0626b39..f5a3b838ddb0 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -198,7 +198,8 @@ extern int buffer_heads_over_limit;
  * Generic address_space_operations implementations for buffer_head-backed
  * address_spaces.
  */
-void block_invalidatepage(struct page *page, unsigned long offset);
+void block_invalidatepage(struct page *page, unsigned int offset,
+                          unsigned int length);
 int block_write_full_page(struct page *page, get_block_t *get_block,
                                 struct writeback_control *wbc);
 int block_write_full_page_endio(struct page *page, get_block_t *get_block,
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 43db02e9c9fa..9f696014988d 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -364,7 +364,7 @@ struct address_space_operations {
 
         /* Unfortunately this kludge is needed for FIBMAP. Don't use it */
         sector_t (*bmap)(struct address_space *, sector_t);
-        void (*invalidatepage) (struct page *, unsigned long);
+        void (*invalidatepage) (struct page *, unsigned int, unsigned int);
         int (*releasepage) (struct page *, gfp_t);
         void (*freepage)(struct page *);
         ssize_t (*direct_IO)(int, struct kiocb *, const struct iovec *iov,
diff --git a/include/linux/mm.h b/include/linux/mm.h
index e0c8528a41a4..66d881f1d576 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -1041,7 +1041,8 @@ int get_kernel_page(unsigned long start, int write, struct page **pages);
 struct page *get_dump_page(unsigned long addr);
 
 extern int try_to_release_page(struct page * page, gfp_t gfp_mask);
-extern void do_invalidatepage(struct page *page, unsigned long offset);
+extern void do_invalidatepage(struct page *page, unsigned int offset,
+                              unsigned int length);
 
 int __set_page_dirty_nobuffers(struct page *page);
 int __set_page_dirty_no_writeback(struct page *page);
diff --git a/mm/readahead.c b/mm/readahead.c
index daed28dd5830..829a77c62834 100644
--- a/mm/readahead.c
+++ b/mm/readahead.c
@@ -48,7 +48,7 @@ static void read_cache_pages_invalidate_page(struct address_space *mapping,
                 if (!trylock_page(page))
                         BUG();
                 page->mapping = mapping;
-                do_invalidatepage(page, 0);
+                do_invalidatepage(page, 0, PAGE_CACHE_SIZE);
                 page->mapping = NULL;
                 unlock_page(page);
         }
diff --git a/mm/truncate.c b/mm/truncate.c
index c75b736e54b7..fdba083f0d71 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -26,7 +26,8 @@
 /**
  * do_invalidatepage - invalidate part or all of a page
  * @page: the page which is affected
- * @offset: the index of the truncation point
+ * @offset: start of the range to invalidate
+ * @length: length of the range to invalidate
  *
  * do_invalidatepage() is called when all or part of the page has become
  * invalidated by a truncate operation.
@@ -37,16 +38,18 @@
  * point.  Because the caller is about to free (and possibly reuse) those
  * blocks on-disk.
  */
-void do_invalidatepage(struct page *page, unsigned long offset)
+void do_invalidatepage(struct page *page, unsigned int offset,
+                       unsigned int length)
 {
-        void (*invalidatepage)(struct page *, unsigned long);
+        void (*invalidatepage)(struct page *, unsigned int, unsigned int);
+
         invalidatepage = page->mapping->a_ops->invalidatepage;
 #ifdef CONFIG_BLOCK
         if (!invalidatepage)
                 invalidatepage = block_invalidatepage;
 #endif
         if (invalidatepage)
-                (*invalidatepage)(page, offset);
+                (*invalidatepage)(page, offset, length);
 }
 
 static inline void truncate_partial_page(struct page *page, unsigned partial)
@@ -54,7 +57,7 @@ static inline void truncate_partial_page(struct page *page, unsigned partial)
         zero_user_segment(page, partial, PAGE_CACHE_SIZE);
         cleancache_invalidate_page(page->mapping, page);
         if (page_has_private(page))
-                do_invalidatepage(page, partial);
+                do_invalidatepage(page, partial, PAGE_CACHE_SIZE - partial);
 }
 
 /*
@@ -103,7 +106,7 @@ truncate_complete_page(struct address_space *mapping, struct page *page)
                 return -EIO;
 
         if (page_has_private(page))
-                do_invalidatepage(page, 0);
+                do_invalidatepage(page, 0, PAGE_CACHE_SIZE);
 
         cancel_dirty_page(page, PAGE_CACHE_SIZE);