msdos_fs_sb.h

来自「Linux Kernel 2.6.9 for OMAP1710」· C头文件 代码 · 共 66 行

#ifndef _MSDOS_FS_SB
#define _MSDOS_FS_SB

/*
 * MS-DOS file system in-core superblock data
 */

struct fat_mount_options {
	uid_t fs_uid;
	gid_t fs_gid;
	unsigned short fs_fmask;
	unsigned short fs_dmask;
	unsigned short codepage;  /* Codepage for shortname conversions */
	char *iocharset;          /* Charset used for filename input/display */
	unsigned short shortname; /* flags for shortname display/create rule */
	unsigned char name_check; /* r = relaxed, n = normal, s = strict */
	unsigned quiet:1,         /* set = fake successful chmods and chowns */
		 showexec:1,      /* set = only set x bit for com/exe/bat */
		 sys_immutable:1, /* set = system files are immutable */
		 dotsOK:1,        /* set = hidden and system files are named '.filename' */
		 isvfat:1,        /* 0=no vfat long filename support, 1=vfat support */
		 utf8:1,	  /* Use of UTF8 character set (Default) */
		 unicode_xlate:1, /* create escape sequences for unhandled Unicode */
		 numtail:1,       /* Does first alias have a numeric '~1' type tail? */
		 atari:1,         /* Use Atari GEMDOS variation of MS-DOS fs */
		 nocase:1;	  /* Does this need case conversion? 0=need case conversion*/
};

#define FAT_CACHE_NR	8 /* number of FAT cache */

struct fat_cache {
	int start_cluster; /* first cluster of the chain. */
	int file_cluster; /* cluster number in the file. */
	int disk_cluster; /* cluster number on disk. */
	struct fat_cache *next; /* next cache entry */
};

struct msdos_sb_info {
	unsigned short sec_per_clus; /* sectors/cluster */
	unsigned short cluster_bits; /* log2(cluster_size) */
	unsigned int cluster_size;   /* cluster size */
	unsigned char fats,fat_bits; /* number of FATs, FAT bits (12 or 16) */
	unsigned short fat_start;
	unsigned long fat_length;    /* FAT start & length (sec.) */
	unsigned long dir_start;
	unsigned short dir_entries;  /* root dir start & entries */
	unsigned long data_start;    /* first data sector */
	unsigned long clusters;      /* number of clusters */
	unsigned long root_cluster;  /* first cluster of the root directory */
	unsigned long fsinfo_sector; /* sector number of FAT32 fsinfo */
	struct semaphore fat_lock;
	int prev_free;               /* previously allocated cluster number */
	int free_clusters;           /* -1 if undefined */
	struct fat_mount_options options;
	struct nls_table *nls_disk;  /* Codepage used on disk */
	struct nls_table *nls_io;    /* Charset used for input and display */
	void *dir_ops;		     /* Opaque; default directory operations */
	int dir_per_block;	     /* dir entries per block */
	int dir_per_block_bits;	     /* log2(dir_per_block) */

	spinlock_t cache_lock;
	struct fat_cache cache_array[FAT_CACHE_NR], *cache;
};

#endif