zte's code,first commit
Change-Id: I9a04da59e459a9bc0d67f101f700d9d7dc8d681b
diff --git a/ap/os/linux/linux-3.4.x/fs/btrfs/ordered-data.h b/ap/os/linux/linux-3.4.x/fs/btrfs/ordered-data.h
new file mode 100644
index 0000000..c355ad4
--- /dev/null
+++ b/ap/os/linux/linux-3.4.x/fs/btrfs/ordered-data.h
@@ -0,0 +1,179 @@
+/*
+ * Copyright (C) 2007 Oracle. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public
+ * License v2 as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
+ * General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public
+ * License along with this program; if not, write to the
+ * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
+ * Boston, MA 021110-1307, USA.
+ */
+
+#ifndef __BTRFS_ORDERED_DATA__
+#define __BTRFS_ORDERED_DATA__
+
+/* one of these per inode */
+struct btrfs_ordered_inode_tree {
+ spinlock_t lock;
+ struct rb_root tree;
+ struct rb_node *last;
+};
+
+/*
+ * these are used to collect checksums done just before bios submission.
+ * They are attached via a list into the ordered extent, and
+ * checksum items are inserted into the tree after all the blocks in
+ * the ordered extent are on disk
+ */
+struct btrfs_sector_sum {
+ /* bytenr on disk */
+ u64 bytenr;
+ u32 sum;
+};
+
+struct btrfs_ordered_sum {
+ /* bytenr is the start of this extent on disk */
+ u64 bytenr;
+
+ /*
+ * this is the length in bytes covered by the sums array below.
+ */
+ unsigned long len;
+ struct list_head list;
+ /* last field is a variable length array of btrfs_sector_sums */
+ struct btrfs_sector_sum sums[];
+};
+
+/*
+ * bits for the flags field:
+ *
+ * BTRFS_ORDERED_IO_DONE is set when all of the blocks are written.
+ * It is used to make sure metadata is inserted into the tree only once
+ * per extent.
+ *
+ * BTRFS_ORDERED_COMPLETE is set when the extent is removed from the
+ * rbtree, just before waking any waiters. It is used to indicate the
+ * IO is done and any metadata is inserted into the tree.
+ */
+#define BTRFS_ORDERED_IO_DONE 0 /* set when all the pages are written */
+
+#define BTRFS_ORDERED_COMPLETE 1 /* set when removed from the tree */
+
+#define BTRFS_ORDERED_NOCOW 2 /* set when we want to write in place */
+
+#define BTRFS_ORDERED_COMPRESSED 3 /* writing a zlib compressed extent */
+
+#define BTRFS_ORDERED_PREALLOC 4 /* set when writing to prealloced extent */
+
+#define BTRFS_ORDERED_DIRECT 5 /* set when we're doing DIO with this extent */
+
+struct btrfs_ordered_extent {
+ /* logical offset in the file */
+ u64 file_offset;
+
+ /* disk byte number */
+ u64 start;
+
+ /* ram length of the extent in bytes */
+ u64 len;
+
+ /* extent length on disk */
+ u64 disk_len;
+
+ /* number of bytes that still need writing */
+ u64 bytes_left;
+
+ /* flags (described above) */
+ unsigned long flags;
+
+ /* compression algorithm */
+ int compress_type;
+
+ /* reference count */
+ atomic_t refs;
+
+ /* the inode we belong to */
+ struct inode *inode;
+
+ /* list of checksums for insertion when the extent io is done */
+ struct list_head list;
+
+ /* used to wait for the BTRFS_ORDERED_COMPLETE bit */
+ wait_queue_head_t wait;
+
+ /* our friendly rbtree entry */
+ struct rb_node rb_node;
+
+ /* a per root list of all the pending ordered extents */
+ struct list_head root_extent_list;
+};
+
+
+/*
+ * calculates the total size you need to allocate for an ordered sum
+ * structure spanning 'bytes' in the file
+ */
+static inline int btrfs_ordered_sum_size(struct btrfs_root *root,
+ unsigned long bytes)
+{
+ unsigned long num_sectors = (bytes + root->sectorsize - 1) /
+ root->sectorsize;
+ num_sectors++;
+ return sizeof(struct btrfs_ordered_sum) +
+ num_sectors * sizeof(struct btrfs_sector_sum);
+}
+
+static inline void
+btrfs_ordered_inode_tree_init(struct btrfs_ordered_inode_tree *t)
+{
+ spin_lock_init(&t->lock);
+ t->tree = RB_ROOT;
+ t->last = NULL;
+}
+
+void btrfs_put_ordered_extent(struct btrfs_ordered_extent *entry);
+void btrfs_remove_ordered_extent(struct inode *inode,
+ struct btrfs_ordered_extent *entry);
+int btrfs_dec_test_ordered_pending(struct inode *inode,
+ struct btrfs_ordered_extent **cached,
+ u64 file_offset, u64 io_size);
+int btrfs_dec_test_first_ordered_pending(struct inode *inode,
+ struct btrfs_ordered_extent **cached,
+ u64 *file_offset, u64 io_size);
+int btrfs_add_ordered_extent(struct inode *inode, u64 file_offset,
+ u64 start, u64 len, u64 disk_len, int type);
+int btrfs_add_ordered_extent_dio(struct inode *inode, u64 file_offset,
+ u64 start, u64 len, u64 disk_len, int type);
+int btrfs_add_ordered_extent_compress(struct inode *inode, u64 file_offset,
+ u64 start, u64 len, u64 disk_len,
+ int type, int compress_type);
+void btrfs_add_ordered_sum(struct inode *inode,
+ struct btrfs_ordered_extent *entry,
+ struct btrfs_ordered_sum *sum);
+struct btrfs_ordered_extent *btrfs_lookup_ordered_extent(struct inode *inode,
+ u64 file_offset);
+void btrfs_start_ordered_extent(struct inode *inode,
+ struct btrfs_ordered_extent *entry, int wait);
+void btrfs_wait_ordered_range(struct inode *inode, u64 start, u64 len);
+struct btrfs_ordered_extent *
+btrfs_lookup_first_ordered_extent(struct inode * inode, u64 file_offset);
+struct btrfs_ordered_extent *btrfs_lookup_ordered_range(struct inode *inode,
+ u64 file_offset,
+ u64 len);
+int btrfs_ordered_update_i_size(struct inode *inode, u64 offset,
+ struct btrfs_ordered_extent *ordered);
+int btrfs_find_ordered_sum(struct inode *inode, u64 offset, u64 disk_bytenr, u32 *sum);
+void btrfs_run_ordered_operations(struct btrfs_root *root, int wait);
+void btrfs_add_ordered_operation(struct btrfs_trans_handle *trans,
+ struct btrfs_root *root,
+ struct inode *inode);
+void btrfs_wait_ordered_extents(struct btrfs_root *root,
+ int nocow_only, int delay_iput);
+#endif