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Linux/fs/ocfs2/refcounttree.h

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  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 
 20 struct 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 
 36 void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
 37 int 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);
 40 void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
 41                                 struct ocfs2_refcount_tree *tree,
 42                                 int rw);
 43 
 44 int 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);
 49 int 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);
 55 int ocfs2_refcount_cow(struct inode *inode,
 56                        struct buffer_head *di_bh,
 57                        u32 cpos, u32 write_len, u32 max_cpos);
 58 
 59 typedef 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  */
 69 struct ocfs2_post_refcount {
 70         int credits;                    /* credits it need for journal. */
 71         ocfs2_post_refcount_func *func; /* real function. */
 72         void *para;
 73 };
 74 
 75 int 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);
 80 int 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);
 87 int ocfs2_duplicate_clusters_by_page(handle_t *handle,
 88                                      struct inode *inode,
 89                                      u32 cpos, u32 old_cluster,
 90                                      u32 new_cluster, u32 new_len);
 91 int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
 92                                     struct inode *inode,
 93                                     u32 cpos, u32 old_cluster,
 94                                     u32 new_cluster, u32 new_len);
 95 int ocfs2_cow_sync_writeback(struct super_block *sb,
 96                              struct inode *inode,
 97                              u32 cpos, u32 num_clusters);
 98 int 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);
105 int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
106 int ocfs2_try_remove_refcount_tree(struct inode *inode,
107                                    struct buffer_head *di_bh);
108 int 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);
114 int ocfs2_reflink_ioctl(struct inode *inode,
115                         const char __user *oldname,
116                         const char __user *newname,
117                         bool preserve);
118 int ocfs2_reflink_remap_range(struct file *file_in,
119                               loff_t pos_in,
120                               struct file *file_out,
121                               loff_t pos_out,
122                               u64 len,
123                               bool is_dedupe);
124 
125 #endif /* OCFS2_REFCOUNTTREE_H */
126 

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