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