b.liu | e958203 | 2025-04-17 19:18:16 +0800 | [diff] [blame^] | 1 | /* SPDX-License-Identifier: GPL-2.0-only */ |
| 2 | /* -*- mode: c; c-basic-offset: 8; -*- |
| 3 | * vim: noexpandtab sw=8 ts=8 sts=0: |
| 4 | * |
| 5 | * extent_map.h |
| 6 | * |
| 7 | * In-memory file extent mappings for OCFS2. |
| 8 | * |
| 9 | * Copyright (C) 2004 Oracle. All rights reserved. |
| 10 | */ |
| 11 | |
| 12 | #ifndef _EXTENT_MAP_H |
| 13 | #define _EXTENT_MAP_H |
| 14 | |
| 15 | struct ocfs2_extent_map_item { |
| 16 | unsigned int ei_cpos; |
| 17 | unsigned int ei_phys; |
| 18 | unsigned int ei_clusters; |
| 19 | unsigned int ei_flags; |
| 20 | |
| 21 | struct list_head ei_list; |
| 22 | }; |
| 23 | |
| 24 | #define OCFS2_MAX_EXTENT_MAP_ITEMS 3 |
| 25 | struct ocfs2_extent_map { |
| 26 | unsigned int em_num_items; |
| 27 | struct list_head em_list; |
| 28 | }; |
| 29 | |
| 30 | void ocfs2_extent_map_init(struct inode *inode); |
| 31 | void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster); |
| 32 | void ocfs2_extent_map_insert_rec(struct inode *inode, |
| 33 | struct ocfs2_extent_rec *rec); |
| 34 | |
| 35 | int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster, |
| 36 | u32 *num_clusters, unsigned int *extent_flags); |
| 37 | int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno, |
| 38 | u64 *ret_count, unsigned int *extent_flags); |
| 39 | |
| 40 | int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, |
| 41 | u64 map_start, u64 map_len); |
| 42 | |
| 43 | int ocfs2_overwrite_io(struct inode *inode, struct buffer_head *di_bh, |
| 44 | u64 map_start, u64 map_len); |
| 45 | |
| 46 | int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int origin); |
| 47 | |
| 48 | int ocfs2_xattr_get_clusters(struct inode *inode, u32 v_cluster, |
| 49 | u32 *p_cluster, u32 *num_clusters, |
| 50 | struct ocfs2_extent_list *el, |
| 51 | unsigned int *extent_flags); |
| 52 | |
| 53 | int ocfs2_read_virt_blocks(struct inode *inode, u64 v_block, int nr, |
| 54 | struct buffer_head *bhs[], int flags, |
| 55 | int (*validate)(struct super_block *sb, |
| 56 | struct buffer_head *bh)); |
| 57 | int ocfs2_figure_hole_clusters(struct ocfs2_caching_info *ci, |
| 58 | struct ocfs2_extent_list *el, |
| 59 | struct buffer_head *eb_bh, |
| 60 | u32 v_cluster, |
| 61 | u32 *num_clusters); |
| 62 | static inline int ocfs2_read_virt_block(struct inode *inode, u64 v_block, |
| 63 | struct buffer_head **bh, |
| 64 | int (*validate)(struct super_block *sb, |
| 65 | struct buffer_head *bh)) |
| 66 | { |
| 67 | int status = 0; |
| 68 | |
| 69 | if (bh == NULL) { |
| 70 | printk("ocfs2: bh == NULL\n"); |
| 71 | status = -EINVAL; |
| 72 | goto bail; |
| 73 | } |
| 74 | |
| 75 | status = ocfs2_read_virt_blocks(inode, v_block, 1, bh, 0, validate); |
| 76 | |
| 77 | bail: |
| 78 | return status; |
| 79 | } |
| 80 | |
| 81 | |
| 82 | #endif /* _EXTENT_MAP_H */ |