| 1 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 2 | * vim: noexpandtab sw=8 ts=8 sts=0: |
| 3 | * |
| 4 | * refcounttree.h |
| 5 | * |
| 6 | * Copyright (C) 2009 Oracle. All rights reserved. |
| 7 | * |
| 8 | * This program is free software; you can redistribute it and/or |
| 9 | * modify it under the terms of the GNU General Public |
| 10 | * License version 2 as published by the Free Software Foundation. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 15 | * General Public License for more details. |
| 16 | */ |
| 17 | #ifndef OCFS2_REFCOUNTTREE_H |
| 18 | #define OCFS2_REFCOUNTTREE_H |
| 19 | |
| 20 | struct ocfs2_refcount_tree { |
| 21 | struct rb_node rf_node; |
| 22 | u64 rf_blkno; |
| 23 | u32 rf_generation; |
| 24 | struct kref rf_getcnt; |
| 25 | struct rw_semaphore rf_sem; |
| 26 | struct ocfs2_lock_res rf_lockres; |
| 27 | int rf_removed; |
| 28 | |
| 29 | /* the following 4 fields are used by caching_info. */ |
| 30 | spinlock_t rf_lock; |
| 31 | struct ocfs2_caching_info rf_ci; |
| 32 | struct mutex rf_io_mutex; |
| 33 | struct super_block *rf_sb; |
| 34 | }; |
| 35 | |
| 36 | void ocfs2_purge_refcount_trees(struct ocfs2_super *osb); |
| 37 | int ocfs2_lock_refcount_tree(struct ocfs2_super *osb, u64 ref_blkno, int rw, |
| 38 | struct ocfs2_refcount_tree **tree, |
| 39 | struct buffer_head **ref_bh); |
| 40 | void ocfs2_unlock_refcount_tree(struct ocfs2_super *osb, |
| 41 | struct ocfs2_refcount_tree *tree, |
| 42 | int rw); |
| 43 | |
| 44 | int ocfs2_decrease_refcount(struct inode *inode, |
| 45 | handle_t *handle, u32 cpos, u32 len, |
| 46 | struct ocfs2_alloc_context *meta_ac, |
| 47 | struct ocfs2_cached_dealloc_ctxt *dealloc, |
| 48 | int delete); |
| 49 | int ocfs2_prepare_refcount_change_for_del(struct inode *inode, |
| 50 | u64 refcount_loc, |
| 51 | u64 phys_blkno, |
| 52 | u32 clusters, |
| 53 | int *credits, |
| 54 | int *ref_blocks); |
| 55 | int ocfs2_refcount_cow(struct inode *inode, |
| 56 | struct buffer_head *di_bh, |
| 57 | u32 cpos, u32 write_len, u32 max_cpos); |
| 58 | |
| 59 | typedef int (ocfs2_post_refcount_func)(struct inode *inode, |
| 60 | handle_t *handle, |
| 61 | void *para); |
| 62 | /* |
| 63 | * Some refcount caller need to do more work after we modify the data b-tree |
| 64 | * during refcount operation(including CoW and add refcount flag), and make the |
| 65 | * transaction complete. So it must give us this structure so that we can do it |
| 66 | * within our transaction. |
| 67 | * |
| 68 | */ |
| 69 | struct ocfs2_post_refcount { |
| 70 | int credits; /* credits it need for journal. */ |
| 71 | ocfs2_post_refcount_func *func; /* real function. */ |
| 72 | void *para; |
| 73 | }; |
| 74 | |
| 75 | int ocfs2_refcounted_xattr_delete_need(struct inode *inode, |
| 76 | struct ocfs2_caching_info *ref_ci, |
| 77 | struct buffer_head *ref_root_bh, |
| 78 | struct ocfs2_xattr_value_root *xv, |
| 79 | int *meta_add, int *credits); |
| 80 | int ocfs2_refcount_cow_xattr(struct inode *inode, |
| 81 | struct ocfs2_dinode *di, |
| 82 | struct ocfs2_xattr_value_buf *vb, |
| 83 | struct ocfs2_refcount_tree *ref_tree, |
| 84 | struct buffer_head *ref_root_bh, |
| 85 | u32 cpos, u32 write_len, |
| 86 | struct ocfs2_post_refcount *post); |
| 87 | int ocfs2_duplicate_clusters_by_page(handle_t *handle, |
| 88 | struct inode *inode, |
| 89 | u32 cpos, u32 old_cluster, |
| 90 | u32 new_cluster, u32 new_len); |
| 91 | int ocfs2_duplicate_clusters_by_jbd(handle_t *handle, |
| 92 | struct inode *inode, |
| 93 | u32 cpos, u32 old_cluster, |
| 94 | u32 new_cluster, u32 new_len); |
| 95 | int ocfs2_cow_sync_writeback(struct super_block *sb, |
| 96 | struct inode *inode, |
| 97 | u32 cpos, u32 num_clusters); |
| 98 | int ocfs2_add_refcount_flag(struct inode *inode, |
| 99 | struct ocfs2_extent_tree *data_et, |
| 100 | struct ocfs2_caching_info *ref_ci, |
| 101 | struct buffer_head *ref_root_bh, |
| 102 | u32 cpos, u32 p_cluster, u32 num_clusters, |
| 103 | struct ocfs2_cached_dealloc_ctxt *dealloc, |
| 104 | struct ocfs2_post_refcount *post); |
| 105 | int ocfs2_remove_refcount_tree(struct inode *inode, struct buffer_head *di_bh); |
| 106 | int ocfs2_try_remove_refcount_tree(struct inode *inode, |
| 107 | struct buffer_head *di_bh); |
| 108 | int ocfs2_increase_refcount(handle_t *handle, |
| 109 | struct ocfs2_caching_info *ci, |
| 110 | struct buffer_head *ref_root_bh, |
| 111 | u64 cpos, u32 len, |
| 112 | struct ocfs2_alloc_context *meta_ac, |
| 113 | struct ocfs2_cached_dealloc_ctxt *dealloc); |
| 114 | int ocfs2_reflink_ioctl(struct inode *inode, |
| 115 | const char __user *oldname, |
| 116 | const char __user *newname, |
| 117 | bool preserve); |
| 118 | #endif /* OCFS2_REFCOUNTTREE_H */ |