root/fs/ocfs2/refcounttree.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2 /* -*- mode: c; c-basic-offset: 8; -*-
   3  * vim: noexpandtab sw=8 ts=8 sts=0:
   4  *
   5  * refcounttree.h
   6  *
   7  * Copyright (C) 2009 Oracle.  All rights reserved.
   8  */
   9 #ifndef OCFS2_REFCOUNTTREE_H
  10 #define OCFS2_REFCOUNTTREE_H
  11 
  12 struct ocfs2_refcount_tree {
  13         struct rb_node rf_node;
  14         u64 rf_blkno;
  15         u32 rf_generation;
  16         struct kref rf_getcnt;
  17         struct rw_semaphore rf_sem;
  18         struct ocfs2_lock_res rf_lockres;
  19         int rf_removed;
  20 
  21         /* the following 4 fields are used by caching_info. */
  22         spinlock_t rf_lock;
  23         struct ocfs2_caching_info rf_ci;
  24         struct mutex rf_io_mutex;
  25         struct super_block *rf_sb;
  26 };
  27 
  28 void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
  29 int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw,
  30                              struct ocfs2_refcount_tree **tree,
  31                              struct buffer_head **ref_bh);
  32 void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
  33                                 struct ocfs2_refcount_tree *tree,
  34                                 int rw);
  35 
  36 int ocfs2_decrease_refcount(struct inode *inode,
  37                             handle_t *handle, u32 cpos, u32 len,
  38                             struct ocfs2_alloc_context *meta_ac,
  39                             struct ocfs2_cached_dealloc_ctxt *dealloc,
  40                             int delete);
  41 int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
  42                                           u64 refcount_loc,
  43                                           u64 phys_blkno,
  44                                           u32 clusters,
  45                                           int *credits,
  46                                           int *ref_blocks);
  47 int ocfs2_refcount_cow(struct inode *inode,
  48                        struct buffer_head *di_bh,
  49                        u32 cpos, u32 write_len, u32 max_cpos);
  50 
  51 typedef int (ocfs2_post_refcount_func)(struct inode *inode,
  52                                        handle_t *handle,
  53                                        void *para);
  54 /*
  55  * Some refcount caller need to do more work after we modify the data b-tree
  56  * during refcount operation(including CoW and add refcount flag), and make the
  57  * transaction complete. So it must give us this structure so that we can do it
  58  * within our transaction.
  59  *
  60  */
  61 struct ocfs2_post_refcount {
  62         int credits;                    /* credits it need for journal. */
  63         ocfs2_post_refcount_func *func; /* real function. */
  64         void *para;
  65 };
  66 
  67 int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
  68                                        struct ocfs2_caching_info *ref_ci,
  69                                        struct buffer_head *ref_root_bh,
  70                                        struct ocfs2_xattr_value_root *xv,
  71                                        int *meta_add, int *credits);
  72 int ocfs2_refcount_cow_xattr(struct inode *inode,
  73                              struct ocfs2_dinode *di,
  74                              struct ocfs2_xattr_value_buf *vb,
  75                              struct ocfs2_refcount_tree *ref_tree,
  76                              struct buffer_head *ref_root_bh,
  77                              u32 cpos, u32 write_len,
  78                              struct ocfs2_post_refcount *post);
  79 int ocfs2_duplicate_clusters_by_page(handle_t *handle,
  80                                      struct inode *inode,
  81                                      u32 cpos, u32 old_cluster,
  82                                      u32 new_cluster, u32 new_len);
  83 int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
  84                                     struct inode *inode,
  85                                     u32 cpos, u32 old_cluster,
  86                                     u32 new_cluster, u32 new_len);
  87 int ocfs2_cow_sync_writeback(struct super_block *sb,
  88                              struct inode *inode,
  89                              u32 cpos, u32 num_clusters);
  90 int ocfs2_add_refcount_flag(struct inode *inode,
  91                             struct ocfs2_extent_tree *data_et,
  92                             struct ocfs2_caching_info *ref_ci,
  93                             struct buffer_head *ref_root_bh,
  94                             u32 cpos, u32 p_cluster, u32 num_clusters,
  95                             struct ocfs2_cached_dealloc_ctxt *dealloc,
  96                             struct ocfs2_post_refcount *post);
  97 int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
  98 int ocfs2_try_remove_refcount_tree(struct inode *inode,
  99                                    struct buffer_head *di_bh);
 100 int ocfs2_increase_refcount(handle_t *handle,
 101                             struct ocfs2_caching_info *ci,
 102                             struct buffer_head *ref_root_bh,
 103                             u64 cpos, u32 len,
 104                             struct ocfs2_alloc_context *meta_ac,
 105                             struct ocfs2_cached_dealloc_ctxt *dealloc);
 106 int ocfs2_reflink_ioctl(struct inode *inode,
 107                         const char __user *oldname,
 108                         const char __user *newname,
 109                         bool preserve);
 110 loff_t ocfs2_reflink_remap_blocks(struct inode *s_inode,
 111                                   struct buffer_head *s_bh,
 112                                   loff_t pos_in,
 113                                   struct inode *t_inode,
 114                                   struct buffer_head *t_bh,
 115                                   loff_t pos_out,
 116                                   loff_t len);
 117 int ocfs2_reflink_inodes_lock(struct inode *s_inode,
 118                               struct buffer_head **bh1,
 119                               struct inode *t_inode,
 120                               struct buffer_head **bh2);
 121 void ocfs2_reflink_inodes_unlock(struct inode *s_inode,
 122                                  struct buffer_head *s_bh,
 123                                  struct inode *t_inode,
 124                                  struct buffer_head *t_bh);
 125 int ocfs2_reflink_update_dest(struct inode *dest,
 126                               struct buffer_head *d_bh,
 127                               loff_t newlen);
 128 
 129 #endif /* OCFS2_REFCOUNTTREE_H */