ext4: convert fault handler to use vm_fault_t type

Return type of ext4_page_mkwrite and ext4_filemap_fault are
changed to use vm_fault_t type.

With this patch all the callers of block_page_mkwrite_return()
are changed to handle vm_fault_t. So converting the return type
of block_page_mkwrite_return() to vm_fault_t.

Signed-off-by: Souptick Joarder <jrdr.linux@gmail.com>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Reviewed-by: Matthew Wilcox <willy@infradead.org>

3 files changed, 18 insertions, 17 deletions

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 57cbc98d730f..86e1bacac757 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -2487,8 +2487,8 @@ extern int ext4_writepage_trans_blocks(struct inode *);
 extern int ext4_chunk_trans_blocks(struct inode *, int nrblocks);
 extern int ext4_zero_partial_blocks(handle_t *handle, struct inode *inode,
                              loff_t lstart, loff_t lend);
-extern int ext4_page_mkwrite(struct vm_fault *vmf);
-extern int ext4_filemap_fault(struct vm_fault *vmf);
+extern vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf);
+extern vm_fault_t ext4_filemap_fault(struct vm_fault *vmf);
 extern qsize_t *ext4_get_reserved_space(struct inode *inode);
 extern int ext4_get_projid(struct inode *inode, kprojid_t *projid);
 extern void ext4_da_release_space(struct inode *inode, int to_free);
diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 9b69f88bdacc..c3d9a42c561e 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -6184,13 +6184,14 @@ static int ext4_bh_unmapped(handle_t *handle, struct buffer_head *bh)
         return !buffer_mapped(bh);
 }
 
-int ext4_page_mkwrite(struct vm_fault *vmf)
+vm_fault_t ext4_page_mkwrite(struct vm_fault *vmf)
 {
         struct vm_area_struct *vma = vmf->vma;
         struct page *page = vmf->page;
         loff_t size;
         unsigned long len;
-        int ret;
+        int err;
+        vm_fault_t ret;
         struct file *file = vma->vm_file;
         struct inode *inode = file_inode(file);
         struct address_space *mapping = inode->i_mapping;
@@ -6203,8 +6204,8 @@ int ext4_page_mkwrite(struct vm_fault *vmf)
 
         down_read(&EXT4_I(inode)->i_mmap_sem);
 
-        ret = ext4_convert_inline_data(inode);
-        if (ret)
+        err = ext4_convert_inline_data(inode);
+        if (err)
                 goto out_ret;
 
         /* Delalloc case is easy... */
@@ -6212,9 +6213,9 @@ int ext4_page_mkwrite(struct vm_fault *vmf)
             !ext4_should_journal_data(inode) &&
             !ext4_nonda_switch(inode->i_sb)) {
                 do {
-                        ret = block_page_mkwrite(vma, vmf,
+                        err = block_page_mkwrite(vma, vmf,
                                                    ext4_da_get_block_prep);
-                } while (ret == -ENOSPC &&
+                } while (err == -ENOSPC &&
                        ext4_should_retry_alloc(inode->i_sb, &retries));
                 goto out_ret;
         }
@@ -6259,8 +6260,8 @@ retry_alloc:
                 ret = VM_FAULT_SIGBUS;
                 goto out;
         }
-        ret = block_page_mkwrite(vma, vmf, get_block);
-        if (!ret && ext4_should_journal_data(inode)) {
+        err = block_page_mkwrite(vma, vmf, get_block);
+        if (!err && ext4_should_journal_data(inode)) {
                 if (ext4_walk_page_buffers(handle, page_buffers(page), 0,
                           PAGE_SIZE, NULL, do_journal_get_write_access)) {
                         unlock_page(page);
@@ -6271,24 +6272,24 @@ retry_alloc:
                 ext4_set_inode_state(inode, EXT4_STATE_JDATA);
         }
         ext4_journal_stop(handle);
-        if (ret == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
+        if (err == -ENOSPC && ext4_should_retry_alloc(inode->i_sb, &retries))
                 goto retry_alloc;
 out_ret:
-        ret = block_page_mkwrite_return(ret);
+        ret = block_page_mkwrite_return(err);
 out:
         up_read(&EXT4_I(inode)->i_mmap_sem);
         sb_end_pagefault(inode->i_sb);
         return ret;
 }
 
-int ext4_filemap_fault(struct vm_fault *vmf)
+vm_fault_t ext4_filemap_fault(struct vm_fault *vmf)
 {
         struct inode *inode = file_inode(vmf->vma->vm_file);
-        int err;
+        vm_fault_t ret;
 
         down_read(&EXT4_I(inode)->i_mmap_sem);
-        err = filemap_fault(vmf);
+        ret = filemap_fault(vmf);
         up_read(&EXT4_I(inode)->i_mmap_sem);
 
-        return err;
+        return ret;
 }
diff --git a/include/linux/buffer_head.h b/include/linux/buffer_head.h
index 96225a77c112..7b73ef7f902d 100644
--- a/include/linux/buffer_head.h
+++ b/include/linux/buffer_head.h
@@ -242,7 +242,7 @@ int block_commit_write(struct page *page, unsigned from, unsigned to);
 int block_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
                                 get_block_t get_block);
 /* Convert errno to return value from ->page_mkwrite() call */
-static inline int block_page_mkwrite_return(int err)
+static inline vm_fault_t block_page_mkwrite_return(int err)
 {
         if (err == 0)
                 return VM_FAULT_LOCKED;