LXR linux/fs/ocfs2/refcounttree.h

   1/* -*- mode: c; c-basic-offset: 8; -*-
   2 * vim: noexpandtab sw=8 ts=8 sts=0:
   3 *
   4 * refcounttree.h
   5 *
   6 * Copyright (C) 2009 Oracle.  All rights reserved.
   7 *
   8 * This program is free software; you can redistribute it and/or
   9 * modify it under the terms of the GNU General Public
  10 * License version 2 as published by the Free Software Foundation.
  11 *
  12 * This program is distributed in the hope that it will be useful,
  13 * but WITHOUT ANY WARRANTY; without even the implied warranty of
  14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  15 * General Public License for more details.
  16 */
  17#ifndef OCFS2_REFCOUNTTREE_H
  18#define OCFS2_REFCOUNTTREE_H
  19
  20struct ocfs2_refcount_tree {
  21        struct rb_node rf_node;
  22        u64 rf_blkno;
  23        u32 rf_generation;
  24        struct kref rf_getcnt;
  25        struct rw_semaphore rf_sem;
  26        struct ocfs2_lock_res rf_lockres;
  27        int rf_removed;
  28
  29        /* the following 4 fields are used by caching_info. */
  30        spinlock_t rf_lock;
  31        struct ocfs2_caching_info rf_ci;
  32        struct mutex rf_io_mutex;
  33        struct super_block *rf_sb;
  34};
  35
  36void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
  37int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw,
  38                             struct ocfs2_refcount_tree **tree,
  39                             struct buffer_head **ref_bh);
  40void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
  41                                struct ocfs2_refcount_tree *tree,
  42                                int rw);
  43
  44int ocfs2_decrease_refcount(struct inode *inode,
  45                            handle_t *handle, u32 cpos, u32 len,
  46                            struct ocfs2_alloc_context *meta_ac,
  47                            struct ocfs2_cached_dealloc_ctxt *dealloc,
  48                            int delete);
  49int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
  50                                          u64 refcount_loc,
  51                                          u64 phys_blkno,
  52                                          u32 clusters,
  53                                          int *credits,
  54                                          int *ref_blocks);
  55int ocfs2_refcount_cow(struct inode *inode,
  56                       struct file *filep, struct buffer_head *di_bh,
  57                       u32 cpos, u32 write_len, u32 max_cpos);
  58
  59typedef int (ocfs2_post_refcount_func)(struct inode *inode,
  60                                       handle_t *handle,
  61                                       void *para);
  62/*
  63 * Some refcount caller need to do more work after we modify the data b-tree
  64 * during refcount operation(including CoW and add refcount flag), and make the
  65 * transaction complete. So it must give us this structure so that we can do it
  66 * within our transaction.
  67 *
  68 */
  69struct ocfs2_post_refcount {
  70        int credits;                    /* credits it need for journal. */
  71        ocfs2_post_refcount_func *func; /* real function. */
  72        void *para;
  73};
  74
  75int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
  76                                       struct ocfs2_caching_info *ref_ci,
  77                                       struct buffer_head *ref_root_bh,
  78                                       struct ocfs2_xattr_value_root *xv,
  79                                       int *meta_add, int *credits);
  80int ocfs2_refcount_cow_xattr(struct inode *inode,
  81                             struct ocfs2_dinode *di,
  82                             struct ocfs2_xattr_value_buf *vb,
  83                             struct ocfs2_refcount_tree *ref_tree,
  84                             struct buffer_head *ref_root_bh,
  85                             u32 cpos, u32 write_len,
  86                             struct ocfs2_post_refcount *post);
  87int ocfs2_duplicate_clusters_by_page(handle_t *handle,
  88                                     struct file *file,
  89                                     u32 cpos, u32 old_cluster,
  90                                     u32 new_cluster, u32 new_len);
  91int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
  92                                    struct file *file,
  93                                    u32 cpos, u32 old_cluster,
  94                                    u32 new_cluster, u32 new_len);
  95int ocfs2_cow_sync_writeback(struct super_block *sb,
  96                             struct inode *inode,
  97                             u32 cpos, u32 num_clusters);
  98int ocfs2_add_refcount_flag(struct inode *inode,
  99                            struct ocfs2_extent_tree *data_et,
 100                            struct ocfs2_caching_info *ref_ci,
 101                            struct buffer_head *ref_root_bh,
 102                            u32 cpos, u32 p_cluster, u32 num_clusters,
 103                            struct ocfs2_cached_dealloc_ctxt *dealloc,
 104                            struct ocfs2_post_refcount *post);
 105int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
 106int ocfs2_try_remove_refcount_tree(struct inode *inode,
 107                                   struct buffer_head *di_bh);
 108int ocfs2_increase_refcount(handle_t *handle,
 109                            struct ocfs2_caching_info *ci,
 110                            struct buffer_head *ref_root_bh,
 111                            u64 cpos, u32 len,
 112                            struct ocfs2_alloc_context *meta_ac,
 113                            struct ocfs2_cached_dealloc_ctxt *dealloc);
 114int ocfs2_reflink_ioctl(struct inode *inode,
 115                        const char __user *oldname,
 116                        const char __user *newname,
 117                        bool preserve);
 118#endif /* OCFS2_REFCOUNTTREE_H */
 119