fs/ocfs2/refcounttree.h

0001 /* SPDX-License-Identifier: GPL-2.0-only */
0002 /*
0003  * refcounttree.h
0004  *
0005  * Copyright (C) 2009 Oracle.  All rights reserved.
0006  */
0007 #ifndef OCFS2_REFCOUNTTREE_H
0008 #define OCFS2_REFCOUNTTREE_H
0009
0010 struct ocfs2_refcount_tree {
0011     struct rb_node rf_node;
0012     u64 rf_blkno;
0013     u32 rf_generation;
0014     struct kref rf_getcnt;
0015     struct rw_semaphore rf_sem;
0016     struct ocfs2_lock_res rf_lockres;
0017     int rf_removed;
0018
0019     /* the following 4 fields are used by caching_info. */
0020     spinlock_t rf_lock;
0021     struct ocfs2_caching_info rf_ci;
0022     struct mutex rf_io_mutex;
0023     struct super_block *rf_sb;
0024 };
0025
0026 void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
0027 int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw,
0028                  struct ocfs2_refcount_tree **tree,
0029                  struct buffer_head **ref_bh);
0030 void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
0031                 struct ocfs2_refcount_tree *tree,
0032                 int rw);
0033
0034 int ocfs2_decrease_refcount(struct inode *inode,
0035                 handle_t *handle, u32 cpos, u32 len,
0036                 struct ocfs2_alloc_context *meta_ac,
0037                 struct ocfs2_cached_dealloc_ctxt *dealloc,
0038                 int delete);
0039 int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
0040                       u64 refcount_loc,
0041                       u64 phys_blkno,
0042                       u32 clusters,
0043                       int *credits,
0044                       int *ref_blocks);
0045 int ocfs2_refcount_cow(struct inode *inode,
0046                struct buffer_head *di_bh,
0047                u32 cpos, u32 write_len, u32 max_cpos);
0048
0049 typedef int (ocfs2_post_refcount_func)(struct inode *inode,
0050                        handle_t *handle,
0051                        void *para);
0052 /*
0053  * Some refcount caller need to do more work after we modify the data b-tree
0054  * during refcount operation(including CoW and add refcount flag), and make the
0055  * transaction complete. So it must give us this structure so that we can do it
0056  * within our transaction.
0057  *
0058  */
0059 struct ocfs2_post_refcount {
0060     int credits;            /* credits it need for journal. */
0061     ocfs2_post_refcount_func *func; /* real function. */
0062     void *para;
0063 };
0064
0065 int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
0066                        struct ocfs2_caching_info *ref_ci,
0067                        struct buffer_head *ref_root_bh,
0068                        struct ocfs2_xattr_value_root *xv,
0069                        int *meta_add, int *credits);
0070 int ocfs2_refcount_cow_xattr(struct inode *inode,
0071                  struct ocfs2_dinode *di,
0072                  struct ocfs2_xattr_value_buf *vb,
0073                  struct ocfs2_refcount_tree *ref_tree,
0074                  struct buffer_head *ref_root_bh,
0075                  u32 cpos, u32 write_len,
0076                  struct ocfs2_post_refcount *post);
0077 int ocfs2_duplicate_clusters_by_page(handle_t *handle,
0078                      struct inode *inode,
0079                      u32 cpos, u32 old_cluster,
0080                      u32 new_cluster, u32 new_len);
0081 int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
0082                     struct inode *inode,
0083                     u32 cpos, u32 old_cluster,
0084                     u32 new_cluster, u32 new_len);
0085 int ocfs2_cow_sync_writeback(struct super_block *sb,
0086                  struct inode *inode,
0087                  u32 cpos, u32 num_clusters);
0088 int ocfs2_add_refcount_flag(struct inode *inode,
0089                 struct ocfs2_extent_tree *data_et,
0090                 struct ocfs2_caching_info *ref_ci,
0091                 struct buffer_head *ref_root_bh,
0092                 u32 cpos, u32 p_cluster, u32 num_clusters,
0093                 struct ocfs2_cached_dealloc_ctxt *dealloc,
0094                 struct ocfs2_post_refcount *post);
0095 int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
0096 int ocfs2_try_remove_refcount_tree(struct inode *inode,
0097                    struct buffer_head *di_bh);
0098 int ocfs2_increase_refcount(handle_t *handle,
0099                 struct ocfs2_caching_info *ci,
0100                 struct buffer_head *ref_root_bh,
0101                 u64 cpos, u32 len,
0102                 struct ocfs2_alloc_context *meta_ac,
0103                 struct ocfs2_cached_dealloc_ctxt *dealloc);
0104 int ocfs2_reflink_ioctl(struct inode *inode,
0105             const char __user *oldname,
0106             const char __user *newname,
0107             bool preserve);
0108 loff_t ocfs2_reflink_remap_blocks(struct inode *s_inode,
0109                   struct buffer_head *s_bh,
0110                   loff_t pos_in,
0111                   struct inode *t_inode,
0112                   struct buffer_head *t_bh,
0113                   loff_t pos_out,
0114                   loff_t len);
0115 int ocfs2_reflink_inodes_lock(struct inode *s_inode,
0116                   struct buffer_head **bh1,
0117                   struct inode *t_inode,
0118                   struct buffer_head **bh2);
0119 void ocfs2_reflink_inodes_unlock(struct inode *s_inode,
0120                  struct buffer_head *s_bh,
0121                  struct inode *t_inode,
0122                  struct buffer_head *t_bh);
0123 int ocfs2_reflink_update_dest(struct inode *dest,
0124                   struct buffer_head *d_bh,
0125                   loff_t newlen);
0126
0127 #endif /* OCFS2_REFCOUNTTREE_H */