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 */ 130