fs/ocfs2/refcounttree.h

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