Merge tag 'for-5.15/drivers-2021-08-30' of git://git.kernel.dk/linux-block
[linux-2.6-microblaze.git] / 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 */