fs/ocfs2/extent_map.h

   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 */