zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/fs/ext4/ext4_jbd2.c b/ap/os/linux/linux-3.4.x/fs/ext4/ext4_jbd2.c
new file mode 100644
index 0000000..d0b8f98
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/ext4/ext4_jbd2.c
@@ -0,0 +1,154 @@
+/*
+ * Interface between ext4 and JBD
+ */
+
+#include "ext4_jbd2.h"
+
+#include <trace/events/ext4.h>
+
+int __ext4_journal_get_write_access(const char *where, unsigned int line,
+ handle_t *handle, struct buffer_head *bh)
+{
+ int err = 0;
+
+ if (ext4_handle_valid(handle)) {
+ err = jbd2_journal_get_write_access(handle, bh);
+ if (err)
+ ext4_journal_abort_handle(where, line, __func__, bh,
+ handle, err);
+ }
+ return err;
+}
+
+/*
+ * The ext4 forget function must perform a revoke if we are freeing data
+ * which has been journaled. Metadata (eg. indirect blocks) must be
+ * revoked in all cases.
+ *
+ * "bh" may be NULL: a metadata block may have been freed from memory
+ * but there may still be a record of it in the journal, and that record
+ * still needs to be revoked.
+ *
+ * If the handle isn't valid we're not journaling, but we still need to
+ * call into ext4_journal_revoke() to put the buffer head.
+ */
+int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
+ int is_metadata, struct inode *inode,
+ struct buffer_head *bh, ext4_fsblk_t blocknr)
+{
+ int err;
+
+ might_sleep();
+
+ trace_ext4_forget(inode, is_metadata, blocknr);
+ BUFFER_TRACE(bh, "enter");
+
+ jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
+ "data mode %x\n",
+ bh, is_metadata, inode->i_mode,
+ test_opt(inode->i_sb, DATA_FLAGS));
+
+ /* In the no journal case, we can just do a bforget and return */
+ if (!ext4_handle_valid(handle)) {
+ bforget(bh);
+ return 0;
+ }
+
+ /* Never use the revoke function if we are doing full data
+ * journaling: there is no need to, and a V1 superblock won't
+ * support it. Otherwise, only skip the revoke on un-journaled
+ * data blocks. */
+
+ if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
+ (!is_metadata && !ext4_should_journal_data(inode))) {
+ if (bh) {
+ BUFFER_TRACE(bh, "call jbd2_journal_forget");
+ err = jbd2_journal_forget(handle, bh);
+ if (err)
+ ext4_journal_abort_handle(where, line, __func__,
+ bh, handle, err);
+ return err;
+ }
+ return 0;
+ }
+
+ /*
+ * data!=journal && (is_metadata || should_journal_data(inode))
+ */
+ BUFFER_TRACE(bh, "call jbd2_journal_revoke");
+ err = jbd2_journal_revoke(handle, blocknr, bh);
+ if (err) {
+ ext4_journal_abort_handle(where, line, __func__,
+ bh, handle, err);
+ __ext4_abort(inode->i_sb, where, line,
+ "error %d when attempting revoke", err);
+ }
+ BUFFER_TRACE(bh, "exit");
+ return err;
+}
+
+int __ext4_journal_get_create_access(const char *where, unsigned int line,
+ handle_t *handle, struct buffer_head *bh)
+{
+ int err = 0;
+
+ if (ext4_handle_valid(handle)) {
+ err = jbd2_journal_get_create_access(handle, bh);
+ if (err)
+ ext4_journal_abort_handle(where, line, __func__,
+ bh, handle, err);
+ }
+ return err;
+}
+
+int __ext4_handle_dirty_metadata(const char *where, unsigned int line,
+ handle_t *handle, struct inode *inode,
+ struct buffer_head *bh)
+{
+ int err = 0;
+
+ if (ext4_handle_valid(handle)) {
+ err = jbd2_journal_dirty_metadata(handle, bh);
+ /* Errors can only happen if there is a bug */
+ if (WARN_ON_ONCE(err)) {
+ ext4_journal_abort_handle(where, line, __func__, bh,
+ handle, err);
+ }
+ } else {
+ if (inode)
+ mark_buffer_dirty_inode(bh, inode);
+ else
+ mark_buffer_dirty(bh);
+ if (inode && inode_needs_sync(inode)) {
+ sync_dirty_buffer(bh);
+ if (buffer_req(bh) && !buffer_uptodate(bh)) {
+ struct ext4_super_block *es;
+
+ es = EXT4_SB(inode->i_sb)->s_es;
+ es->s_last_error_block =
+ cpu_to_le64(bh->b_blocknr);
+ ext4_error_inode(inode, where, line,
+ bh->b_blocknr,
+ "IO error syncing itable block");
+ err = -EIO;
+ }
+ }
+ }
+ return err;
+}
+
+int __ext4_handle_dirty_super(const char *where, unsigned int line,
+ handle_t *handle, struct super_block *sb)
+{
+ struct buffer_head *bh = EXT4_SB(sb)->s_sbh;
+ int err = 0;
+
+ if (ext4_handle_valid(handle)) {
+ err = jbd2_journal_dirty_metadata(handle, bh);
+ if (err)
+ ext4_journal_abort_handle(where, line, __func__,
+ bh, handle, err);
+ } else
+ sb->s_dirt = 1;
+ return err;
+}