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132 lines
4.0 KiB
C
132 lines
4.0 KiB
C
/* fs.h - filesystem manager */
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/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2002,2003,2004,2007,2008,2009 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef GRUB_FS_HEADER
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#define GRUB_FS_HEADER 1
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#include <grub/device.h>
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#include <grub/symbol.h>
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#include <grub/types.h>
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#include <grub/list.h>
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/* For embedding types. */
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#ifdef GRUB_UTIL
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#include <grub/partition.h>
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#endif
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/* Forward declaration is required, because of mutual reference. */
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struct grub_file;
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struct grub_dirhook_info
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{
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unsigned dir:1;
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unsigned mtimeset:1;
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unsigned case_insensitive:1;
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unsigned inodeset:1;
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grub_int32_t mtime;
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grub_uint64_t inode;
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};
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typedef int (*grub_fs_dir_hook_t) (const char *filename,
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const struct grub_dirhook_info *info,
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void *data);
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/* Filesystem descriptor. */
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struct grub_fs
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{
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/* The next filesystem. */
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struct grub_fs *next;
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struct grub_fs **prev;
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/* My name. */
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const char *name;
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/* Call HOOK with each file under DIR. */
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grub_err_t (*dir) (grub_device_t device, const char *path,
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grub_fs_dir_hook_t hook, void *hook_data);
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/* Open a file named NAME and initialize FILE. */
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grub_err_t (*open) (struct grub_file *file, const char *name);
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/* Read LEN bytes data from FILE into BUF. */
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grub_ssize_t (*read) (struct grub_file *file, char *buf, grub_size_t len);
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/* Close the file FILE. */
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grub_err_t (*close) (struct grub_file *file);
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/* Return the label of the device DEVICE in LABEL. The label is
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returned in a grub_malloc'ed buffer and should be freed by the
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caller. */
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grub_err_t (*label) (grub_device_t device, char **label);
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/* Return the uuid of the device DEVICE in UUID. The uuid is
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returned in a grub_malloc'ed buffer and should be freed by the
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caller. */
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grub_err_t (*uuid) (grub_device_t device, char **uuid);
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/* Get writing time of filesystem. */
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grub_err_t (*mtime) (grub_device_t device, grub_int32_t *timebuf);
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#ifdef GRUB_UTIL
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/* Determine sectors available for embedding. */
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grub_err_t (*embed) (grub_device_t device, unsigned int *nsectors,
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unsigned int max_nsectors,
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grub_embed_type_t embed_type,
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grub_disk_addr_t **sectors);
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/* Whether this filesystem reserves first sector for DOS-style boot. */
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int reserved_first_sector;
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/* Whether blocklist installs have a chance to work. */
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int blocklist_install;
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#endif
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};
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typedef struct grub_fs *grub_fs_t;
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/* This is special, because block lists are not files in usual sense. */
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extern struct grub_fs grub_fs_blocklist;
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/* This hook is used to automatically load filesystem modules.
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If this hook loads a module, return non-zero. Otherwise return zero.
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The newly loaded filesystem is assumed to be inserted into the head of
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the linked list GRUB_FS_LIST through the function grub_fs_register. */
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typedef int (*grub_fs_autoload_hook_t) (void);
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extern grub_fs_autoload_hook_t EXPORT_VAR(grub_fs_autoload_hook);
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extern grub_fs_t EXPORT_VAR (grub_fs_list);
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#ifndef GRUB_LST_GENERATOR
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static inline void
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grub_fs_register (grub_fs_t fs)
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{
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grub_list_push (GRUB_AS_LIST_P (&grub_fs_list), GRUB_AS_LIST (fs));
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}
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#endif
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static inline void
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grub_fs_unregister (grub_fs_t fs)
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{
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grub_list_remove (GRUB_AS_LIST (fs));
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}
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#define FOR_FILESYSTEMS(var) FOR_LIST_ELEMENTS((var), (grub_fs_list))
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grub_fs_t EXPORT_FUNC(grub_fs_probe) (grub_device_t device);
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#endif /* ! GRUB_FS_HEADER */
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