clean up write_begin usage for directories in pagecache

For filesystem that implement directories in pagecache we call
block_write_begin with an already allocated page for this code, while the
normal regular file write path uses the default block_write_begin behaviour.

Get rid of the __foofs_write_begin helper and opencode the normal write_begin
call in foofs_write_begin, while adding a new foofs_prepare_chunk helper for
the directory code.  The added benefit is that foofs_prepare_chunk has
a much saner calling convention.

Note that the interruptible flag passed into block_write_begin is always
ignored if we already pass in a page (see next patch for details), and
we never were doing truncations of exessive blocks for this case either so we
can switch directly to block_write_begin_newtrunc.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 7 insertions, 14 deletions

diff --git a/fs/minix/dir.c b/fs/minix/dir.c
index 1dbf921ca44b..085a9262c692 100644
--- a/fs/minix/dir.c
+++ b/fs/minix/dir.c
@@ -271,8 +271,7 @@ int minix_add_link(struct dentry *dentry, struct inode *inode)
 
 got_it:
         pos = page_offset(page) + p - (char *)page_address(page);
-        err = __minix_write_begin(NULL, page->mapping, pos, sbi->s_dirsize,
-                                        AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
+        err = minix_prepare_chunk(page, pos, sbi->s_dirsize);
         if (err)
                 goto out_unlock;
         memcpy (namx, name, namelen);
@@ -297,8 +296,7 @@ out_unlock:
 
 int minix_delete_entry(struct minix_dir_entry *de, struct page *page)
 {
-        struct address_space *mapping = page->mapping;
-        struct inode *inode = (struct inode*)mapping->host;
+        struct inode *inode = page->mapping->host;
         char *kaddr = page_address(page);
         loff_t pos = page_offset(page) + (char*)de - kaddr;
         struct minix_sb_info *sbi = minix_sb(inode->i_sb);
@@ -306,8 +304,7 @@ int minix_delete_entry(struct minix_dir_entry *de, struct page *page)
         int err;
 
         lock_page(page);
-        err = __minix_write_begin(NULL, mapping, pos, len,
-                                        AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
+        err = minix_prepare_chunk(page, pos, len);
         if (err == 0) {
                 if (sbi->s_version == MINIX_V3)
                         ((minix3_dirent *) de)->inode = 0;
@@ -325,16 +322,14 @@ int minix_delete_entry(struct minix_dir_entry *de, struct page *page)
 
 int minix_make_empty(struct inode *inode, struct inode *dir)
 {
-        struct address_space *mapping = inode->i_mapping;
-        struct page *page = grab_cache_page(mapping, 0);
+        struct page *page = grab_cache_page(inode->i_mapping, 0);
         struct minix_sb_info *sbi = minix_sb(inode->i_sb);
         char *kaddr;
         int err;
 
         if (!page)
                 return -ENOMEM;
-        err = __minix_write_begin(NULL, mapping, 0, 2 * sbi->s_dirsize,
-                                        AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
+        err = minix_prepare_chunk(page, 0, 2 * sbi->s_dirsize);
         if (err) {
                 unlock_page(page);
                 goto fail;
@@ -425,8 +420,7 @@ not_empty:
 void minix_set_link(struct minix_dir_entry *de, struct page *page,
         struct inode *inode)
 {
-        struct address_space *mapping = page->mapping;
-        struct inode *dir = mapping->host;
+        struct inode *dir = page->mapping->host;
         struct minix_sb_info *sbi = minix_sb(dir->i_sb);
         loff_t pos = page_offset(page) +
                         (char *)de-(char*)page_address(page);
@@ -434,8 +428,7 @@ void minix_set_link(struct minix_dir_entry *de, struct page *page,
 
         lock_page(page);
 
-        err = __minix_write_begin(NULL, mapping, pos, sbi->s_dirsize,
-                                        AOP_FLAG_UNINTERRUPTIBLE, &page, NULL);
+        err = minix_prepare_chunk(page, pos, sbi->s_dirsize);
         if (err == 0) {
                 if (sbi->s_version == MINIX_V3)
                         ((minix3_dirent *) de)->inode = inode->i_ino;