x86: fix pageattr-selftest

[linux-2.6] / fs / buffer.c

diff --git a/fs/buffer.c b/fs/buffer.c
index 76403b1764c54e53b5b2cb2660ae11d7352f0319..456c9ab7705b0fce1f7299ee455c26614330fb34 100644 (file)
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -2563,7 +2563,7 @@ int nobh_write_end(struct file *file, struct address_space *mapping,
                        struct page *page, void *fsdata)
 {
        struct inode *inode = page->mapping->host;
-       struct buffer_head *head = NULL;
+       struct buffer_head *head = fsdata;
        struct buffer_head *bh;
 
        if (!PageMappedToDisk(page)) {
@@ -2584,7 +2584,6 @@ int nobh_write_end(struct file *file, struct address_space *mapping,
        unlock_page(page);
        page_cache_release(page);
 
-       head = fsdata;
        while (head) {
                bh = head;
                head = head->b_this_page;
@@ -3214,6 +3213,50 @@ static int buffer_cpu_notify(struct notifier_block *self,
        return NOTIFY_OK;
 }
 
+/**
+ * bh_uptodate_or_lock: Test whether the buffer is uptodate
+ * @bh: struct buffer_head
+ *
+ * Return true if the buffer is up-to-date and false,
+ * with the buffer locked, if not.
+ */
+int bh_uptodate_or_lock(struct buffer_head *bh)
+{
+       if (!buffer_uptodate(bh)) {
+               lock_buffer(bh);
+               if (!buffer_uptodate(bh))
+                       return 0;
+               unlock_buffer(bh);
+       }
+       return 1;
+}
+EXPORT_SYMBOL(bh_uptodate_or_lock);
+
+/**
+ * bh_submit_read: Submit a locked buffer for reading
+ * @bh: struct buffer_head
+ *
+ * Returns zero on success and -EIO on error.
+ */
+int bh_submit_read(struct buffer_head *bh)
+{
+       BUG_ON(!buffer_locked(bh));
+
+       if (buffer_uptodate(bh)) {
+               unlock_buffer(bh);
+               return 0;
+       }
+
+       get_bh(bh);
+       bh->b_end_io = end_buffer_read_sync;
+       submit_bh(READ, bh);
+       wait_on_buffer(bh);
+       if (buffer_uptodate(bh))
+               return 0;
+       return -EIO;
+}
+EXPORT_SYMBOL(bh_submit_read);
+
 void __init buffer_init(void)
 {
        int nrpages;