include/exfat_fs.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  *   Copyright (C) 2021 LG Electronics.
   4  *
   5  *   Author(s): Hyunchul Lee <hyc.lee@gmail.com>
   6  */
   7 #ifndef _EXFAT_FS_H_
   8 #define _EXFAT_FS_H_
   9
  10 #include "list.h"
  11
  12 struct exfat_dentry;
  13
  14 struct exfat_inode {
  15         struct exfat_inode      *parent;
  16         struct list_head        children;
  17         struct list_head        sibling;
  18         struct list_head        list;
  19         clus_t                  first_clus;
  20         __u16                   attr;
  21         uint64_t                size;
  22         bool                    is_contiguous;
  23         struct exfat_dentry     *dentry_set;
  24         int                     dentry_count;
  25         off_t                   dev_offset;
  26         __le16                  name[0];        /* only for directory */
  27 };
  28
  29 #define EXFAT_NAME_MAX                  255
  30 #define NAME_BUFFER_SIZE                ((EXFAT_NAME_MAX + 1) * 2)
  31
  32 struct exfat {
  33         struct exfat_blk_dev    *blk_dev;
  34         struct pbr              *bs;
  35         char                    volume_label[VOLUME_LABEL_BUFFER_SIZE];
  36         struct exfat_inode      *root;
  37         struct list_head        dir_list;
  38         clus_t                  clus_count;
  39         unsigned int            clus_size;
  40         unsigned int            sect_size;
  41         char                    *disk_bitmap;
  42         char                    *alloc_bitmap;
  43         char                    *ohead_bitmap;
  44         clus_t                  disk_bitmap_clus;
  45         unsigned int            disk_bitmap_size;
  46         __u16                   *upcase_table;
  47         clus_t                  start_clu;
  48         unsigned int            buffer_count;
  49         struct buffer_desc      *lookup_buffer; /* for dentry set lookup */
  50 };
  51
  52 struct exfat_dentry_loc {
  53         struct exfat_inode      *parent;
  54         off_t                   file_offset;
  55         off_t                   dev_offset;
  56 };
  57
  58 struct path_resolve_ctx {
  59         struct exfat_inode      *ancestors[255];
  60         __le16                  utf16_path[PATH_MAX + 2];
  61         char                    local_path[PATH_MAX * MB_LEN_MAX + 1];
  62 };
  63
  64 struct buffer_desc {
  65         __u32           p_clus;
  66         unsigned int    offset;
  67         char            *buffer;
  68         char            dirty[EXFAT_BITMAP_SIZE(4 * KB / 512)];
  69 };
  70
  71 struct exfat *exfat_alloc_exfat(struct exfat_blk_dev *blk_dev, struct pbr *bs);
  72 void exfat_free_exfat(struct exfat *exfat);
  73
  74 struct exfat_inode *exfat_alloc_inode(__u16 attr);
  75 void exfat_free_inode(struct exfat_inode *node);
  76
  77 void exfat_free_children(struct exfat_inode *dir, bool file_only);
  78 void exfat_free_file_children(struct exfat_inode *dir);
  79 void exfat_free_ancestors(struct exfat_inode *child);
  80 void exfat_free_dir_list(struct exfat *exfat);
  81
  82 int exfat_resolve_path(struct path_resolve_ctx *ctx, struct exfat_inode *child);
  83 int exfat_resolve_path_parent(struct path_resolve_ctx *ctx,
  84                               struct exfat_inode *parent, struct exfat_inode *child);
  85
  86 struct buffer_desc *exfat_alloc_buffer(struct exfat *exfat);
  87 void exfat_free_buffer(const struct exfat *exfat, struct buffer_desc *bd);
  88
  89 static inline unsigned int exfat_get_read_size(const struct exfat *exfat)
  90 {
  91         return MIN(exfat->clus_size, 4 * KB);
  92 }
  93 #endif