6 files changed, 63 insertions, 17 deletions

diff --git a/fs/ocfs2/aops.c b/fs/ocfs2/aops.c
index f477f18b35d5..5cfeee118158 100644
--- a/fs/ocfs2/aops.c
+++ b/fs/ocfs2/aops.c
@@ -1642,7 +1642,8 @@ static int ocfs2_zero_tail(struct inode *inode, struct buffer_head *di_bh,
         return ret;
 }
 
-int ocfs2_write_begin_nolock(struct address_space *mapping,
+int ocfs2_write_begin_nolock(struct file *filp,
+                             struct address_space *mapping,
                              loff_t pos, unsigned len, unsigned flags,
                              struct page **pagep, void **fsdata,
                              struct buffer_head *di_bh, struct page *mmap_page)
@@ -1692,7 +1693,7 @@ int ocfs2_write_begin_nolock(struct address_space *mapping,
                 mlog_errno(ret);
                 goto out;
         } else if (ret == 1) {
-                ret = ocfs2_refcount_cow(inode, di_bh,
+                ret = ocfs2_refcount_cow(inode, filp, di_bh,
                                          wc->w_cpos, wc->w_clen, UINT_MAX);
                 if (ret) {
                         mlog_errno(ret);
@@ -1854,7 +1855,7 @@ static int ocfs2_write_begin(struct file *file, struct address_space *mapping,
          */
         down_write(&OCFS2_I(inode)->ip_alloc_sem);
 
-        ret = ocfs2_write_begin_nolock(mapping, pos, len, flags, pagep,
+        ret = ocfs2_write_begin_nolock(file, mapping, pos, len, flags, pagep,
                                        fsdata, di_bh, NULL);
         if (ret) {
                 mlog_errno(ret);
diff --git a/fs/ocfs2/aops.h b/fs/ocfs2/aops.h
index c48e93ffc513..7606f663da6d 100644
--- a/fs/ocfs2/aops.h
+++ b/fs/ocfs2/aops.h
@@ -48,7 +48,8 @@ int ocfs2_write_end_nolock(struct address_space *mapping,
                            loff_t pos, unsigned len, unsigned copied,
                            struct page *page, void *fsdata);
 
-int ocfs2_write_begin_nolock(struct address_space *mapping,
+int ocfs2_write_begin_nolock(struct file *filp,
+                             struct address_space *mapping,
                              loff_t pos, unsigned len, unsigned flags,
                              struct page **pagep, void **fsdata,
                              struct buffer_head *di_bh, struct page *mmap_page);
diff --git a/fs/ocfs2/file.c b/fs/ocfs2/file.c
index b03f6601fd71..9a74542e1a05 100644
--- a/fs/ocfs2/file.c
+++ b/fs/ocfs2/file.c
@@ -360,7 +360,7 @@ static int ocfs2_cow_file_pos(struct inode *inode,
         if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
                 goto out;
 
-        return ocfs2_refcount_cow(inode, fe_bh, cpos, 1, cpos+1);
+        return ocfs2_refcount_cow(inode, NULL, fe_bh, cpos, 1, cpos+1);
 
 out:
         return status;
@@ -903,8 +903,8 @@ static int ocfs2_zero_extend_get_range(struct inode *inode,
                 zero_clusters = last_cpos - zero_cpos;
 
         if (needs_cow) {
-                rc = ocfs2_refcount_cow(inode, di_bh, zero_cpos, zero_clusters,
-                                        UINT_MAX);
+                rc = ocfs2_refcount_cow(inode, NULL, di_bh, zero_cpos,
+                                        zero_clusters, UINT_MAX);
                 if (rc) {
                         mlog_errno(rc);
                         goto out;
@@ -2052,6 +2052,7 @@ out:
 }
 
 static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
+                                            struct file *file,
                                             loff_t pos, size_t count,
                                             int *meta_level)
 {
@@ -2069,7 +2070,7 @@ static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
 
         *meta_level = 1;
 
-        ret = ocfs2_refcount_cow(inode, di_bh, cpos, clusters, UINT_MAX);
+        ret = ocfs2_refcount_cow(inode, file, di_bh, cpos, clusters, UINT_MAX);
         if (ret)
                 mlog_errno(ret);
 out:
@@ -2077,7 +2078,7 @@ out:
         return ret;
 }
 
-static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
+static int ocfs2_prepare_inode_for_write(struct file *file,
                                          loff_t *ppos,
                                          size_t count,
                                          int appending,
@@ -2085,6 +2086,7 @@ static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
                                          int *has_refcount)
 {
         int ret = 0, meta_level = 0;
+        struct dentry *dentry = file->f_path.dentry;
         struct inode *inode = dentry->d_inode;
         loff_t saved_pos, end;
 
@@ -2140,6 +2142,7 @@ static int ocfs2_prepare_inode_for_write(struct dentry *dentry,
                         meta_level = -1;
 
                         ret = ocfs2_prepare_inode_for_refcount(inode,
+                                                               file,
                                                                saved_pos,
                                                                count,
                                                                &meta_level);
@@ -2254,7 +2257,7 @@ relock:
         }
 
         can_do_direct = direct_io;
-        ret = ocfs2_prepare_inode_for_write(file->f_path.dentry, ppos,
+        ret = ocfs2_prepare_inode_for_write(file, ppos,
                                             iocb->ki_left, appending,
                                             &can_do_direct, &has_refcount);
         if (ret < 0) {
@@ -2373,7 +2376,7 @@ static int ocfs2_splice_to_file(struct pipe_inode_info *pipe,
 {
         int ret;
 
-        ret = ocfs2_prepare_inode_for_write(out->f_path.dentry, &sd->pos,
+        ret = ocfs2_prepare_inode_for_write(out, &sd->pos,
                                             sd->total_len, 0, NULL, NULL);
         if (ret < 0) {
                 mlog_errno(ret);
diff --git a/fs/ocfs2/mmap.c b/fs/ocfs2/mmap.c
index 4c18f4ad93b4..7e32db9c2c99 100644
--- a/fs/ocfs2/mmap.c
+++ b/fs/ocfs2/mmap.c
@@ -59,10 +59,11 @@ static int ocfs2_fault(struct vm_area_struct *area, struct vm_fault *vmf)
         return ret;
 }
 
-static int __ocfs2_page_mkwrite(struct inode *inode, struct buffer_head *di_bh,
+static int __ocfs2_page_mkwrite(struct file *file, struct buffer_head *di_bh,
                                 struct page *page)
 {
         int ret;
+        struct inode *inode = file->f_path.dentry->d_inode;
         struct address_space *mapping = inode->i_mapping;
         loff_t pos = page_offset(page);
         unsigned int len = PAGE_CACHE_SIZE;
@@ -111,7 +112,7 @@ static int __ocfs2_page_mkwrite(struct inode *inode, struct buffer_head *di_bh,
         if (page->index == last_index)
                 len = ((size - 1) & ~PAGE_CACHE_MASK) + 1;
 
-        ret = ocfs2_write_begin_nolock(mapping, pos, len, 0, &locked_page,
+        ret = ocfs2_write_begin_nolock(file, mapping, pos, len, 0, &locked_page,
                                        &fsdata, di_bh, page);
         if (ret) {
                 if (ret != -ENOSPC)
@@ -159,7 +160,7 @@ static int ocfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
          */
         down_write(&OCFS2_I(inode)->ip_alloc_sem);
 
-        ret = __ocfs2_page_mkwrite(inode, di_bh, page);
+        ret = __ocfs2_page_mkwrite(vma->vm_file, di_bh, page);
 
         up_write(&OCFS2_I(inode)->ip_alloc_sem);
 
diff --git a/fs/ocfs2/refcounttree.c b/fs/ocfs2/refcounttree.c
index 0afeda83120f..a120cfcf69bf 100644
--- a/fs/ocfs2/refcounttree.c
+++ b/fs/ocfs2/refcounttree.c
@@ -49,6 +49,7 @@
 
 struct ocfs2_cow_context {
         struct inode *inode;
+        struct file *file;
         u32 cow_start;
         u32 cow_len;
         struct ocfs2_extent_tree data_et;
@@ -2932,13 +2933,16 @@ static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
         u64 new_block = ocfs2_clusters_to_blocks(sb, new_cluster);
         struct page *page;
         pgoff_t page_index;
-        unsigned int from, to;
+        unsigned int from, to, readahead_pages;
         loff_t offset, end, map_end;
         struct address_space *mapping = context->inode->i_mapping;
 
         mlog(0, "old_cluster %u, new %u, len %u at offset %u\n", old_cluster,
              new_cluster, new_len, cpos);
 
+        readahead_pages =
+                (ocfs2_cow_contig_clusters(sb) <<
+                 OCFS2_SB(sb)->s_clustersize_bits) >> PAGE_CACHE_SHIFT;
         offset = ((loff_t)cpos) << OCFS2_SB(sb)->s_clustersize_bits;
         end = offset + (new_len << OCFS2_SB(sb)->s_clustersize_bits);
         /*
@@ -2969,6 +2973,14 @@ static int ocfs2_duplicate_clusters_by_page(handle_t *handle,
                 if (PAGE_CACHE_SIZE <= OCFS2_SB(sb)->s_clustersize)
                         BUG_ON(PageDirty(page));
 
+                if (PageReadahead(page) && context->file) {
+                        page_cache_async_readahead(mapping,
+                                                   &context->file->f_ra,
+                                                   context->file,
+                                                   page, page_index,
+                                                   readahead_pages);
+                }
+
                 if (!PageUptodate(page)) {
                         ret = block_read_full_page(page, ocfs2_get_block);
                         if (ret) {
@@ -3409,12 +3421,35 @@ static int ocfs2_replace_cow(struct ocfs2_cow_context *context)
         return ret;
 }
 
+static void ocfs2_readahead_for_cow(struct inode *inode,
+                                    struct file *file,
+                                    u32 start, u32 len)
+{
+        struct address_space *mapping;
+        pgoff_t index;
+        unsigned long num_pages;
+        int cs_bits = OCFS2_SB(inode->i_sb)->s_clustersize_bits;
+
+        if (!file)
+                return;
+
+        mapping = file->f_mapping;
+        num_pages = (len << cs_bits) >> PAGE_CACHE_SHIFT;
+        if (!num_pages)
+                num_pages = 1;
+
+        index = ((loff_t)start << cs_bits) >> PAGE_CACHE_SHIFT;
+        page_cache_sync_readahead(mapping, &file->f_ra, file,
+                                  index, num_pages);
+}
+
 /*
  * Starting at cpos, try to CoW write_len clusters.  Don't CoW
  * past max_cpos.  This will stop when it runs into a hole or an
  * unrefcounted extent.
  */
 static int ocfs2_refcount_cow_hunk(struct inode *inode,
+                                   struct file *file,
                                    struct buffer_head *di_bh,
                                    u32 cpos, u32 write_len, u32 max_cpos)
 {
@@ -3443,6 +3478,8 @@ static int ocfs2_refcount_cow_hunk(struct inode *inode,
 
         BUG_ON(cow_len == 0);
 
+        ocfs2_readahead_for_cow(inode, file, cow_start, cow_len);
+
         context = kzalloc(sizeof(struct ocfs2_cow_context), GFP_NOFS);
         if (!context) {
                 ret = -ENOMEM;
@@ -3464,6 +3501,7 @@ static int ocfs2_refcount_cow_hunk(struct inode *inode,
         context->ref_root_bh = ref_root_bh;
         context->cow_duplicate_clusters = ocfs2_duplicate_clusters_by_page;
         context->get_clusters = ocfs2_di_get_clusters;
+        context->file = file;
 
         ocfs2_init_dinode_extent_tree(&context->data_et,
                                       INODE_CACHE(inode), di_bh);
@@ -3492,6 +3530,7 @@ out:
  * clusters between cpos and cpos+write_len are safe to modify.
  */
 int ocfs2_refcount_cow(struct inode *inode,
+                       struct file *file,
                        struct buffer_head *di_bh,
                        u32 cpos, u32 write_len, u32 max_cpos)
 {
@@ -3511,7 +3550,7 @@ int ocfs2_refcount_cow(struct inode *inode,
                         num_clusters = write_len;
 
                 if (ext_flags & OCFS2_EXT_REFCOUNTED) {
-                        ret = ocfs2_refcount_cow_hunk(inode, di_bh, cpos,
+                        ret = ocfs2_refcount_cow_hunk(inode, file, di_bh, cpos,
                                                       num_clusters, max_cpos);
                         if (ret) {
                                 mlog_errno(ret);
diff --git a/fs/ocfs2/refcounttree.h b/fs/ocfs2/refcounttree.h
index f04892d6175d..c8ce46f7d8e3 100644
--- a/fs/ocfs2/refcounttree.h
+++ b/fs/ocfs2/refcounttree.h
@@ -52,7 +52,8 @@ int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
                                           u32 clusters,
                                           int *credits,
                                           int *ref_blocks);
-int ocfs2_refcount_cow(struct inode *inode, struct buffer_head *di_bh,
+int ocfs2_refcount_cow(struct inode *inode,
+                       struct file *filep, struct buffer_head *di_bh,
                        u32 cpos, u32 write_len, u32 max_cpos);
 
 typedef int (ocfs2_post_refcount_func)(struct inode *inode,