LXR linux/fs/ocfs2/extent

   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
  15struct 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
  25struct ocfs2_extent_map {
  26        unsigned int                    em_num_items;
  27        struct list_head                em_list;
  28};
  29
  30void ocfs2_extent_map_init(struct inode *inode);
  31void ocfs2_extent_map_trunc(struct inode *inode, unsigned int cluster);
  32void ocfs2_extent_map_insert_rec(struct inode *inode,
  33                                 struct ocfs2_extent_rec *rec);
  34
  35int ocfs2_get_clusters(struct inode *inode, u32 v_cluster, u32 *p_cluster,
  36                       u32 *num_clusters, unsigned int *extent_flags);
  37int ocfs2_extent_map_get_blocks(struct inode *inode, u64 v_blkno, u64 *p_blkno,
  38                                u64 *ret_count, unsigned int *extent_flags);
  39
  40int ocfs2_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
  41                 u64 map_start, u64 map_len);
  42
  43int ocfs2_overwrite_io(struct inode *inode, struct buffer_head *di_bh,
  44                       u64 map_start, u64 map_len);
  45
  46int ocfs2_seek_data_hole_offset(struct file *file, loff_t *offset, int origin);
  47
  48int 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
  53int 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));
  57int 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);
  62static 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
  77bail:
  78        return status;
  79}
  80
  81
  82#endif  /* _EXTENT_MAP_H */
  83