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 */