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- /* -*- mode: c; c-basic-offset: 8; -*-
- * vim: noexpandtab sw=8 ts=8 sts=0:
- *
- * refcounttree.h
- *
- * Copyright (C) 2009 Oracle. All rights reserved.
- *
- * This program is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public
- * License version 2 as published by the Free Software Foundation.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
- * General Public License for more details.
- */
- #ifndef OCFS2_REFCOUNTTREE_H
- #define OCFS2_REFCOUNTTREE_H
- struct ocfs2_refcount_tree {
- struct rb_node rf_node;
- u64 rf_blkno;
- u32 rf_generation;
- struct kref rf_getcnt;
- struct rw_semaphore rf_sem;
- struct ocfs2_lock_res rf_lockres;
- int rf_removed;
- /* the following 4 fields are used by caching_info. */
- spinlock_t rf_lock;
- struct ocfs2_caching_info rf_ci;
- struct mutex rf_io_mutex;
- struct super_block *rf_sb;
- };
- void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
- int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw,
- struct ocfs2_refcount_tree **tree,
- struct buffer_head **ref_bh);
- void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
- struct ocfs2_refcount_tree *tree,
- int rw);
- int ocfs2_decrease_refcount(struct inode *inode,
- handle_t *handle, u32 cpos, u32 len,
- struct ocfs2_alloc_context *meta_ac,
- struct ocfs2_cached_dealloc_ctxt *dealloc,
- int delete);
- int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
- u64 refcount_loc,
- u64 phys_blkno,
- u32 clusters,
- int *credits,
- int *ref_blocks);
- int ocfs2_refcount_cow(struct inode *inode,
- struct buffer_head *di_bh,
- u32 cpos, u32 write_len, u32 max_cpos);
- typedef int (ocfs2_post_refcount_func)(struct inode *inode,
- handle_t *handle,
- void *para);
- /*
- * Some refcount caller need to do more work after we modify the data b-tree
- * during refcount operation(including CoW and add refcount flag), and make the
- * transaction complete. So it must give us this structure so that we can do it
- * within our transaction.
- *
- */
- struct ocfs2_post_refcount {
- int credits; /* credits it need for journal. */
- ocfs2_post_refcount_func *func; /* real function. */
- void *para;
- };
- int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
- struct ocfs2_caching_info *ref_ci,
- struct buffer_head *ref_root_bh,
- struct ocfs2_xattr_value_root *xv,
- int *meta_add, int *credits);
- int ocfs2_refcount_cow_xattr(struct inode *inode,
- struct ocfs2_dinode *di,
- struct ocfs2_xattr_value_buf *vb,
- struct ocfs2_refcount_tree *ref_tree,
- struct buffer_head *ref_root_bh,
- u32 cpos, u32 write_len,
- struct ocfs2_post_refcount *post);
- int ocfs2_duplicate_clusters_by_page(handle_t *handle,
- struct inode *inode,
- u32 cpos, u32 old_cluster,
- u32 new_cluster, u32 new_len);
- int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
- struct inode *inode,
- u32 cpos, u32 old_cluster,
- u32 new_cluster, u32 new_len);
- int ocfs2_cow_sync_writeback(struct super_block *sb,
- struct inode *inode,
- u32 cpos, u32 num_clusters);
- int ocfs2_add_refcount_flag(struct inode *inode,
- struct ocfs2_extent_tree *data_et,
- struct ocfs2_caching_info *ref_ci,
- struct buffer_head *ref_root_bh,
- u32 cpos, u32 p_cluster, u32 num_clusters,
- struct ocfs2_cached_dealloc_ctxt *dealloc,
- struct ocfs2_post_refcount *post);
- int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
- int ocfs2_try_remove_refcount_tree(struct inode *inode,
- struct buffer_head *di_bh);
- int ocfs2_increase_refcount(handle_t *handle,
- struct ocfs2_caching_info *ci,
- struct buffer_head *ref_root_bh,
- u64 cpos, u32 len,
- struct ocfs2_alloc_context *meta_ac,
- struct ocfs2_cached_dealloc_ctxt *dealloc);
- int ocfs2_reflink_ioctl(struct inode *inode,
- const char __user *oldname,
- const char __user *newname,
- bool preserve);
- #endif /* OCFS2_REFCOUNTTREE_H */
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