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172 lines
5 KiB
C
172 lines
5 KiB
C
/* Some of the source code in this file came from "linux/fs/fat/fat.h". */
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/*
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* Copyright (C) 2012-2013 Samsung Electronics Co., Ltd.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program 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 this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*/
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#ifndef _EXFAT_LINUX_H
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#define _EXFAT_LINUX_H
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#include <linux/buffer_head.h>
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#include <linux/string.h>
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#include <linux/nls.h>
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#include <linux/fs.h>
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#include <linux/mutex.h>
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#include <linux/swap.h>
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#include "exfat_config.h"
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#include "exfat_global.h"
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#include "exfat_data.h"
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#include "exfat_oal.h"
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#include "exfat_blkdev.h"
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#include "exfat_cache.h"
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#include "exfat_part.h"
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#include "exfat_nls.h"
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#include "exfat_api.h"
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#include "exfat.h"
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#define EXFAT_ERRORS_CONT 1 /* ignore error and continue */
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#define EXFAT_ERRORS_PANIC 2 /* panic on error */
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#define EXFAT_ERRORS_RO 3 /* remount r/o on error */
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/* ioctl command */
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#define EXFAT_IOCTL_GET_VOLUME_ID _IOR('r', 0x12, __u32)
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struct exfat_mount_options {
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,5,0)
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kuid_t fs_uid;
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kgid_t fs_gid;
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#else
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uid_t fs_uid;
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gid_t fs_gid;
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#endif
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unsigned short fs_fmask;
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unsigned short fs_dmask;
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unsigned short allow_utime; /* permission for setting the [am]time */
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unsigned short codepage; /* codepage for shortname conversions */
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char *iocharset; /* charset for filename input/display */
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unsigned char casesensitive;
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unsigned char errors; /* on error: continue, panic, remount-ro */
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#if EXFAT_CONFIG_DISCARD
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unsigned char discard; /* flag on if -o dicard specified and device support discard() */
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#endif /* EXFAT_CONFIG_DISCARD */
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};
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#define EXFAT_HASH_BITS 8
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#define EXFAT_HASH_SIZE (1UL << EXFAT_HASH_BITS)
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/*
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* EXFAT file system in-core superblock data
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*/
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struct exfat_sb_info {
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FS_INFO_T fs_info;
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BD_INFO_T bd_info;
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struct exfat_mount_options options;
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,7,00)
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int s_dirt;
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struct mutex s_lock;
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#endif
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struct nls_table *nls_disk; /* Codepage used on disk */
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struct nls_table *nls_io; /* Charset used for input and display */
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struct inode *fat_inode;
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spinlock_t inode_hash_lock;
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struct hlist_head inode_hashtable[EXFAT_HASH_SIZE];
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#if EXFAT_CONFIG_KERNEL_DEBUG
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long debug_flags;
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#endif /* EXFAT_CONFIG_KERNEL_DEBUG */
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};
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/*
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* EXFAT file system inode data in memory
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*/
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struct exfat_inode_info {
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FILE_ID_T fid;
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char *target;
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/* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */
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loff_t mmu_private; /* physically allocated size */
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loff_t i_pos; /* on-disk position of directory entry or 0 */
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struct hlist_node i_hash_fat; /* hash by i_location */
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#if LINUX_VERSION_CODE >= KERNEL_VERSION(3,4,00)
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struct rw_semaphore truncate_lock;
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#endif
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struct inode vfs_inode;
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struct rw_semaphore i_alloc_sem; /* protect bmap against truncate */
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};
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#define EXFAT_SB(sb) ((struct exfat_sb_info *)((sb)->s_fs_info))
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static inline struct exfat_inode_info *EXFAT_I(struct inode *inode) {
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return container_of(inode, struct exfat_inode_info, vfs_inode);
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}
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/*
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* If ->i_mode can't hold S_IWUGO (i.e. ATTR_RO), we use ->i_attrs to
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* save ATTR_RO instead of ->i_mode.
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*
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* If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only
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* bit, it's just used as flag for app.
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*/
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static inline int exfat_mode_can_hold_ro(struct inode *inode)
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{
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struct exfat_sb_info *sbi = EXFAT_SB(inode->i_sb);
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if (S_ISDIR(inode->i_mode))
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return 0;
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if ((~sbi->options.fs_fmask) & S_IWUGO)
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return 1;
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return 0;
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}
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/* Convert attribute bits and a mask to the UNIX mode. */
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static inline mode_t exfat_make_mode(struct exfat_sb_info *sbi,
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u32 attr, mode_t mode)
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{
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if ((attr & ATTR_READONLY) && !(attr & ATTR_SUBDIR))
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mode &= ~S_IWUGO;
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if (attr & ATTR_SUBDIR)
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return (mode & ~sbi->options.fs_dmask) | S_IFDIR;
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else if (attr & ATTR_SYMLINK)
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return (mode & ~sbi->options.fs_dmask) | S_IFLNK;
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else
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return (mode & ~sbi->options.fs_fmask) | S_IFREG;
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}
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/* Return the FAT attribute byte for this inode */
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static inline u32 exfat_make_attr(struct inode *inode)
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{
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if (exfat_mode_can_hold_ro(inode) && !(inode->i_mode & S_IWUGO))
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return ((EXFAT_I(inode)->fid.attr) | ATTR_READONLY);
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else
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return (EXFAT_I(inode)->fid.attr);
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}
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static inline void exfat_save_attr(struct inode *inode, u32 attr)
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{
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if (exfat_mode_can_hold_ro(inode))
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EXFAT_I(inode)->fid.attr = attr & ATTR_RWMASK;
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else
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EXFAT_I(inode)->fid.attr = attr & (ATTR_RWMASK | ATTR_READONLY);
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}
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#endif /* _EXFAT_LINUX_H */
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