3e19a25e05
The original goal of commonizing these funcs is to benefit defraging/extent_moving codes in the future, based on the fact that reflink and defragmentation having the same Copy-On-Wrtie mechanism. Signed-off-by: Tristan Ye <tristan.ye@oracle.com>
118 lines
4.2 KiB
C
118 lines
4.2 KiB
C
/* -*- mode: c; c-basic-offset: 8; -*-
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* vim: noexpandtab sw=8 ts=8 sts=0:
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*
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* refcounttree.h
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*
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* Copyright (C) 2009 Oracle. All rights reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public
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* License version 2 as published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*/
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#ifndef OCFS2_REFCOUNTTREE_H
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#define OCFS2_REFCOUNTTREE_H
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struct ocfs2_refcount_tree {
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struct rb_node rf_node;
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u64 rf_blkno;
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u32 rf_generation;
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struct kref rf_getcnt;
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struct rw_semaphore rf_sem;
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struct ocfs2_lock_res rf_lockres;
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int rf_removed;
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/* the following 4 fields are used by caching_info. */
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spinlock_t rf_lock;
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struct ocfs2_caching_info rf_ci;
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struct mutex rf_io_mutex;
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struct super_block *rf_sb;
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};
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void ocfs2_purge_refcount_trees(struct ocfs2_super *osb);
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int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw,
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struct ocfs2_refcount_tree **tree,
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struct buffer_head **ref_bh);
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void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb,
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struct ocfs2_refcount_tree *tree,
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int rw);
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int ocfs2_decrease_refcount(struct inode *inode,
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handle_t *handle, u32 cpos, u32 len,
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struct ocfs2_alloc_context *meta_ac,
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struct ocfs2_cached_dealloc_ctxt *dealloc,
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int delete);
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int ocfs2_prepare_refcount_change_for_del(struct inode *inode,
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u64 refcount_loc,
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u64 phys_blkno,
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u32 clusters,
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int *credits,
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int *ref_blocks);
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int ocfs2_refcount_cow(struct inode *inode,
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struct file *filep, struct buffer_head *di_bh,
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u32 cpos, u32 write_len, u32 max_cpos);
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typedef int (ocfs2_post_refcount_func)(struct inode *inode,
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handle_t *handle,
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void *para);
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/*
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* Some refcount caller need to do more work after we modify the data b-tree
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* during refcount operation(including CoW and add refcount flag), and make the
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* transaction complete. So it must give us this structure so that we can do it
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* within our transaction.
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*
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*/
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struct ocfs2_post_refcount {
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int credits; /* credits it need for journal. */
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ocfs2_post_refcount_func *func; /* real function. */
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void *para;
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};
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int ocfs2_refcounted_xattr_delete_need(struct inode *inode,
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struct ocfs2_caching_info *ref_ci,
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struct buffer_head *ref_root_bh,
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struct ocfs2_xattr_value_root *xv,
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int *meta_add, int *credits);
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int ocfs2_refcount_cow_xattr(struct inode *inode,
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struct ocfs2_dinode *di,
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struct ocfs2_xattr_value_buf *vb,
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struct ocfs2_refcount_tree *ref_tree,
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struct buffer_head *ref_root_bh,
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u32 cpos, u32 write_len,
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struct ocfs2_post_refcount *post);
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int ocfs2_duplicate_clusters_by_page(handle_t *handle,
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struct file *file,
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u32 cpos, u32 old_cluster,
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u32 new_cluster, u32 new_len);
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int ocfs2_duplicate_clusters_by_jbd(handle_t *handle,
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struct file *file,
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u32 cpos, u32 old_cluster,
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u32 new_cluster, u32 new_len);
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int ocfs2_cow_sync_writeback(struct super_block *sb,
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struct inode *inode,
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u32 cpos, u32 num_clusters);
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int ocfs2_add_refcount_flag(struct inode *inode,
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struct ocfs2_extent_tree *data_et,
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struct ocfs2_caching_info *ref_ci,
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struct buffer_head *ref_root_bh,
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u32 cpos, u32 p_cluster, u32 num_clusters,
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struct ocfs2_cached_dealloc_ctxt *dealloc,
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struct ocfs2_post_refcount *post);
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int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh);
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int ocfs2_try_remove_refcount_tree(struct inode *inode,
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struct buffer_head *di_bh);
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int ocfs2_increase_refcount(handle_t *handle,
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struct ocfs2_caching_info *ci,
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struct buffer_head *ref_root_bh,
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u64 cpos, u32 len,
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struct ocfs2_alloc_context *meta_ac,
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struct ocfs2_cached_dealloc_ctxt *dealloc);
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int ocfs2_reflink_ioctl(struct inode *inode,
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const char __user *oldname,
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const char __user *newname,
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bool preserve);
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#endif /* OCFS2_REFCOUNTTREE_H */
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