LXR linux/fs/ocfs2/refcounttree.h

   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
  12struct 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
  28void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
  29int 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);
  32void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
  33                                struct ocfs2_refcount_tree *tree,
  34                                int rw);
  35
  36int 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);
  41int 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);
  47int ocfs2_refcount_cow(struct inode *inode,
  48                       struct buffer_head *di_bh,
  49                       u32 cpos, u32 write_len, u32 max_cpos);
  50
  51typedef 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 */
  61struct ocfs2_post_refcount {
  62        int credits;                    /* credits it need for journal. */
  63        ocfs2_post_refcount_func *func; /* real function. */
  64        void *para;
  65};
  66
  67int 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);
  72int 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);
  79int 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);
  83int 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);
  87int ocfs2_cow_sync_writeback(struct super_block *sb,
  88                             struct inode *inode,
  89                             u32 cpos, u32 num_clusters);
  90int 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);
  97int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
  98int ocfs2_try_remove_refcount_tree(struct inode *inode,
  99                                   struct buffer_head *di_bh);
 100int 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);
 106int ocfs2_reflink_ioctl(struct inode *inode,
 107                        const char __user *oldname,
 108                        const char __user *newname,
 109                        bool preserve);
 110loff_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);
 117int ocfs2_reflink_inodes_lock(struct inode *s_inode,
 118                              struct buffer_head **bh1,
 119                              struct inode *t_inode,
 120                              struct buffer_head **bh2);
 121void 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);
 125int ocfs2_reflink_update_dest(struct inode *dest,
 126                              struct buffer_head *d_bh,
 127                              loff_t newlen);
 128
 129#endif /* OCFS2_REFCOUNTTREE_H */
 130