Merge branch 'merge'

[pandora-kernel.git] / fs / ufs / util.c

diff --git a/fs/ufs/util.c b/fs/ufs/util.c
index f9556bc..22f820a 100644 (file)
--- a/fs/ufs/util.c
+++ b/fs/ufs/util.c
@@ -14,15 +14,6 @@
 #include "swab.h"
 #include "util.h"
 
-#undef UFS_UTILS_DEBUG
-
-#ifdef UFS_UTILS_DEBUG
-#define UFSD(x) printk("(%s, %d), %s: ", __FILE__, __LINE__, __FUNCTION__); printk x;
-#else
-#define UFSD(x)
-#endif
-
-
 struct ufs_buffer_head * _ubh_bread_ (struct ufs_sb_private_info * uspi,
        struct super_block *sb, u64 fragment, u64 size)
 {
@@ -121,13 +112,12 @@ void ubh_mark_buffer_uptodate (struct ufs_buffer_head * ubh, int flag)
        }
 }
 
-void ubh_ll_rw_block (int rw, unsigned nr, struct ufs_buffer_head * ubh[])
+void ubh_ll_rw_block(int rw, struct ufs_buffer_head *ubh)
 {
-       unsigned i;
        if (!ubh)
                return;
-       for ( i = 0; i < nr; i++ )
-               ll_rw_block (rw, ubh[i]->count, ubh[i]->bh);
+
+       ll_rw_block(rw, ubh->count, ubh->bh);
 }
 
 void ubh_wait_on_buffer (struct ufs_buffer_head * ubh)
@@ -243,3 +233,58 @@ ufs_set_inode_dev(struct super_block *sb, struct ufs_inode_info *ufsi, dev_t dev
        else
                ufsi->i_u1.i_data[0] = fs32;
 }
+
+/**
+ * ufs_get_locked_page() - locate, pin and lock a pagecache page, if not exist
+ * read it from disk.
+ * @mapping: the address_space to search
+ * @index: the page index
+ *
+ * Locates the desired pagecache page, if not exist we'll read it,
+ * locks it, increments its reference
+ * count and returns its address.
+ *
+ */
+
+struct page *ufs_get_locked_page(struct address_space *mapping,
+                                pgoff_t index)
+{
+       struct page *page;
+
+       page = find_lock_page(mapping, index);
+       if (!page) {
+               page = read_cache_page(mapping, index,
+                                      (filler_t*)mapping->a_ops->readpage,
+                                      NULL);
+
+               if (IS_ERR(page)) {
+                       printk(KERN_ERR "ufs_change_blocknr: "
+                              "read_cache_page error: ino %lu, index: %lu\n",
+                              mapping->host->i_ino, index);
+                       goto out;
+               }
+
+               lock_page(page);
+
+               if (unlikely(page->mapping == NULL)) {
+                       /* Truncate got there first */
+                       unlock_page(page);
+                       page_cache_release(page);
+                       page = NULL;
+                       goto out;
+               }
+
+               if (!PageUptodate(page) || PageError(page)) {
+                       unlock_page(page);
+                       page_cache_release(page);
+
+                       printk(KERN_ERR "ufs_change_blocknr: "
+                              "can not read page: ino %lu, index: %lu\n",
+                              mapping->host->i_ino, index);
+
+                       page = ERR_PTR(-EIO);
+               }
+       }
+out:
+       return page;
+}