cregit-Linux how code gets into the kernel

Release 4.10 fs/fat/fat.h

Directory: fs/fat
#ifndef _FAT_H

#define _FAT_H

#include <linux/buffer_head.h>
#include <linux/nls.h>
#include <linux/hash.h>
#include <linux/ratelimit.h>
#include <linux/msdos_fs.h>

 * vfat shortname flags

#define VFAT_SFN_DISPLAY_LOWER	0x0001 
/* convert to lowercase for display */

#define VFAT_SFN_DISPLAY_WIN95	0x0002 
/* emulate win95 rule for display */

#define VFAT_SFN_DISPLAY_WINNT	0x0004 
/* emulate winnt rule for display */

#define VFAT_SFN_CREATE_WIN95	0x0100 
/* emulate win95 rule for create */

#define VFAT_SFN_CREATE_WINNT	0x0200 
/* emulate winnt rule for create */

#define FAT_ERRORS_CONT		1      
/* ignore error and continue */

#define FAT_ERRORS_PANIC	2      
/* panic on error */

#define FAT_ERRORS_RO		3      
/* remount r/o on error */

#define FAT_NFS_STALE_RW	1      
/* NFS RW support, can cause ESTALE */

#define FAT_NFS_NOSTALE_RO	2      
/* NFS RO support, no ESTALE issue */

struct fat_mount_options {
kuid_t fs_uid;
kgid_t fs_gid;
unsigned short fs_fmask;
unsigned short fs_dmask;
unsigned short codepage;   /* Codepage for shortname conversions */
int time_offset;	   /* Offset of timestamps from UTC (in minutes) */
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 char errors;	   /* On error: continue, panic, remount-ro */
unsigned char nfs;	  /* NFS support: nostale_ro, stale_rw */
unsigned short allow_utime;/* permission for setting the [am]time */
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 UTF-8 character set (Default) */
unicode_xlate:1,  /* create escape sequences for unhandled Unicode */
numtail:1,        /* Does first alias have a numeric '~1' type tail? */
flush:1,	   /* write things quickly */
nocase:1,	   /* Does this need case conversion? 0=need case conversion*/
usefree:1,	   /* Use free_clusters for FAT32 */
tz_set:1,	   /* Filesystem timestamps' offset set */
rodir:1,	   /* allow ATTR_RO for directory */
discard:1,	   /* Issue discard requests on deletions */
dos1xfloppy:1;	   /* Assume default BPB for DOS 1.x floppies */

#define FAT_HASH_BITS	8


 * MS-DOS file system in-core superblock data

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 (12,16 or 32) */
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 max_cluster;    /* maximum cluster number */
unsigned long root_cluster;   /* first cluster of the root directory */
unsigned long fsinfo_sector;  /* sector number of FAT32 fsinfo */
struct mutex fat_lock;
struct mutex nfs_build_inode_lock;
struct mutex s_lock;
unsigned int prev_free;      /* previously allocated cluster number */
unsigned int free_clusters;  /* -1 if undefined */
unsigned int free_clus_valid; /* is free_clusters valid? */
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 */
const void *dir_ops;	      /* Opaque; default directory operations */
int dir_per_block;	      /* dir entries per block */
int dir_per_block_bits;	      /* log2(dir_per_block) */
unsigned int vol_id;		/*volume ID*/

int fatent_shift;
const struct fatent_operations *fatent_ops;
struct inode *fat_inode;
struct inode *fsinfo_inode;

struct ratelimit_state ratelimit;

spinlock_t inode_hash_lock;
struct hlist_head inode_hashtable[FAT_HASH_SIZE];

spinlock_t dir_hash_lock;
struct hlist_head dir_hashtable[FAT_HASH_SIZE];

unsigned int dirty;           /* fs state before mount */
struct rcu_head rcu;

#define FAT_CACHE_VALID	0	
/* special case for valid cache */

 * MS-DOS file system inode data in memory

struct msdos_inode_info {
spinlock_t cache_lru_lock;
struct list_head cache_lru;
int nr_caches;
	/* for avoiding the race between fat_free() and fat_get_cluster() */
unsigned int cache_valid_id;

	/* NOTE: mmu_private is 64bits, so must hold ->i_mutex to access */
loff_t mmu_private;	/* physically allocated size */

int i_start;		/* first cluster or 0 */
int i_logstart;		/* logical first cluster */
int i_attrs;		/* unused attribute bits */
loff_t i_pos;		/* on-disk position of directory entry or 0 */
struct hlist_node i_fat_hash;	/* hash by i_location */
struct hlist_node i_dir_hash;	/* hash by i_logstart */
struct rw_semaphore truncate_lock; /* protect bmap against truncate */
struct inode vfs_inode;

struct fat_slot_info {
loff_t i_pos;		/* on-disk position of directory entry */
loff_t slot_off;	/* offset for slot or de start */
int nr_slots;		/* number of slots + 1(de) in filename */
struct msdos_dir_entry *de;
struct buffer_head *bh;

static inline struct msdos_sb_info *MSDOS_SB(struct super_block *sb) { return sb->s_fs_info; }


hirofumi ogawahirofumi ogawa19100.00%1100.00%

static inline struct msdos_inode_info *MSDOS_I(struct inode *inode) { return container_of(inode, struct msdos_inode_info, vfs_inode); }


hirofumi ogawahirofumi ogawa25100.00%1100.00%

/* * If ->i_mode can't hold S_IWUGO (i.e. ATTR_RO), we use ->i_attrs to * save ATTR_RO instead of ->i_mode. * * If it's directory and !sbi->options.rodir, ATTR_RO isn't read-only * bit, it's just used as flag for app. */
static inline int fat_mode_can_hold_ro(struct inode *inode) { struct msdos_sb_info *sbi = MSDOS_SB(inode->i_sb); umode_t mask; if (S_ISDIR(inode->i_mode)) { if (!sbi->options.rodir) return 0; mask = ~sbi->options.fs_dmask; } else mask = ~sbi->options.fs_fmask; if (!(mask & S_IWUGO)) return 0; return 1; }


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/* Convert attribute bits and a mask to the UNIX mode. */
static inline umode_t fat_make_mode(struct msdos_sb_info *sbi, u8 attrs, umode_t mode) { if (attrs & ATTR_RO && !((attrs & ATTR_DIR) && !sbi->options.rodir)) mode &= ~S_IWUGO; if (attrs & ATTR_DIR) return (mode & ~sbi->options.fs_dmask) | S_IFDIR; else return (mode & ~sbi->options.fs_fmask) | S_IFREG; }


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/* Return the FAT attribute byte for this inode */
static inline u8 fat_make_attrs(struct inode *inode) { u8 attrs = MSDOS_I(inode)->i_attrs; if (S_ISDIR(inode->i_mode)) attrs |= ATTR_DIR; if (fat_mode_can_hold_ro(inode) && !(inode->i_mode & S_IWUGO)) attrs |= ATTR_RO; return attrs; }


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static inline void fat_save_attrs(struct inode *inode, u8 attrs) { if (fat_mode_can_hold_ro(inode)) MSDOS_I(inode)->i_attrs = attrs & ATTR_UNUSED; else MSDOS_I(inode)->i_attrs = attrs & (ATTR_UNUSED | ATTR_RO); }


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static inline unsigned char fat_checksum(const __u8 *name) { unsigned char s = name[0]; s = (s<<7) + (s>>1) + name[1]; s = (s<<7) + (s>>1) + name[2]; s = (s<<7) + (s>>1) + name[3]; s = (s<<7) + (s>>1) + name[4]; s = (s<<7) + (s>>1) + name[5]; s = (s<<7) + (s>>1) + name[6]; s = (s<<7) + (s>>1) + name[7]; s = (s<<7) + (s>>1) + name[8]; s = (s<<7) + (s>>1) + name[9]; s = (s<<7) + (s>>1) + name[10]; return s; }


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static inline sector_t fat_clus_to_blknr(struct msdos_sb_info *sbi, int clus) { return ((sector_t)clus - FAT_START_ENT) * sbi->sec_per_clus + sbi->data_start; }


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static inline void fat_get_blknr_offset(struct msdos_sb_info *sbi, loff_t i_pos, sector_t *blknr, int *offset) { *blknr = i_pos >> sbi->dir_per_block_bits; *offset = i_pos & (sbi->dir_per_block - 1); }


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static inline loff_t fat_i_pos_read(struct msdos_sb_info *sbi, struct inode *inode) { loff_t i_pos; #if BITS_PER_LONG == 32 spin_lock(&sbi->inode_hash_lock); #endif i_pos = MSDOS_I(inode)->i_pos; #if BITS_PER_LONG == 32 spin_unlock(&sbi->inode_hash_lock); #endif return i_pos; }


namjae jeonnamjae jeon62100.00%1100.00%

static inline void fat16_towchar(wchar_t *dst, const __u8 *src, size_t len) { #ifdef __BIG_ENDIAN while (len--) { *dst++ = src[0] | (src[1] << 8); src += 2; } #else memcpy(dst, src, len * 2); #endif }


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static inline int fat_get_start(const struct msdos_sb_info *sbi, const struct msdos_dir_entry *de) { int cluster = le16_to_cpu(de->start); if (sbi->fat_bits == 32) cluster |= (le16_to_cpu(de->starthi) << 16); return cluster; }


steven j. magnanisteven j. magnani53100.00%1100.00%

static inline void fat_set_start(struct msdos_dir_entry *de, int cluster) { de->start = cpu_to_le16(cluster); de->starthi = cpu_to_le16(cluster >> 16); }


steven j. magnanisteven j. magnani35100.00%1100.00%

static inline void fatwchar_to16(__u8 *dst, const wchar_t *src, size_t len) { #ifdef __BIG_ENDIAN while (len--) { dst[0] = *src & 0x00FF; dst[1] = (*src & 0xFF00) >> 8; dst += 2; src++; } #else memcpy(dst, src, len * 2); #endif }


hirofumi ogawahirofumi ogawa75100.00%1100.00%

/* fat/cache.c */ extern void fat_cache_inval_inode(struct inode *inode); extern int fat_get_cluster(struct inode *inode, int cluster, int *fclus, int *dclus); extern int fat_get_mapped_cluster(struct inode *inode, sector_t sector, sector_t last_block, unsigned long *mapped_blocks, sector_t *bmap); extern int fat_bmap(struct inode *inode, sector_t sector, sector_t *phys, unsigned long *mapped_blocks, int create, bool from_bmap); /* fat/dir.c */ extern const struct file_operations fat_dir_operations; extern int fat_search_long(struct inode *inode, const unsigned char *name, int name_len, struct fat_slot_info *sinfo); extern int fat_dir_empty(struct inode *dir); extern int fat_subdirs(struct inode *dir); extern int fat_scan(struct inode *dir, const unsigned char *name, struct fat_slot_info *sinfo); extern int fat_scan_logstart(struct inode *dir, int i_logstart, struct fat_slot_info *sinfo); extern int fat_get_dotdot_entry(struct inode *dir, struct buffer_head **bh, struct msdos_dir_entry **de); extern int fat_alloc_new_dir(struct inode *dir, struct timespec *ts); extern int fat_add_entries(struct inode *dir, void *slots, int nr_slots, struct fat_slot_info *sinfo); extern int fat_remove_entries(struct inode *dir, struct fat_slot_info *sinfo); /* fat/fatent.c */ struct fat_entry { int entry; union { u8 *ent12_p[2]; __le16 *ent16_p; __le32 *ent32_p; } u; int nr_bhs; struct buffer_head *bhs[2]; struct inode *fat_inode; };
static inline void fatent_init(struct fat_entry *fatent) { fatent->nr_bhs = 0; fatent->entry = 0; fatent->u.ent32_p = NULL; fatent->bhs[0] = fatent->bhs[1] = NULL; fatent->fat_inode = NULL; }


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static inline void fatent_set_entry(struct fat_entry *fatent, int entry) { fatent->entry = entry; fatent->u.ent32_p = NULL; }


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static inline void fatent_brelse(struct fat_entry *fatent) { int i; fatent->u.ent32_p = NULL; for (i = 0; i < fatent->nr_bhs; i++) brelse(fatent->bhs[i]); fatent->nr_bhs = 0; fatent->bhs[0] = fatent->bhs[1] = NULL; fatent->fat_inode = NULL; }


hirofumi ogawahirofumi ogawa7092.11%150.00%
al viroal viro67.89%150.00%

extern void fat_ent_access_init(struct super_block *sb); extern int fat_ent_read(struct inode *inode, struct fat_entry *fatent, int entry); extern int fat_ent_write(struct inode *inode, struct fat_entry *fatent, int new, int wait); extern int fat_alloc_clusters(struct inode *inode, int *cluster, int nr_cluster); extern int fat_free_clusters(struct inode *inode, int cluster); extern int fat_count_free_clusters(struct super_block *sb); /* fat/file.c */ extern long fat_generic_ioctl(struct file *filp, unsigned int cmd, unsigned long arg); extern const struct file_operations fat_file_operations; extern const struct inode_operations fat_file_inode_operations; extern int fat_setattr(struct dentry *dentry, struct iattr *attr); extern void fat_truncate_blocks(struct inode *inode, loff_t offset); extern int fat_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat); extern int fat_file_fsync(struct file *file, loff_t start, loff_t end, int datasync); /* fat/inode.c */ extern int fat_block_truncate_page(struct inode *inode, loff_t from); extern void fat_attach(struct inode *inode, loff_t i_pos); extern void fat_detach(struct inode *inode); extern struct inode *fat_iget(struct super_block *sb, loff_t i_pos); extern struct inode *fat_build_inode(struct super_block *sb, struct msdos_dir_entry *de, loff_t i_pos); extern int fat_sync_inode(struct inode *inode); extern int fat_fill_super(struct super_block *sb, void *data, int silent, int isvfat, void (*setup)(struct super_block *)); extern int fat_fill_inode(struct inode *inode, struct msdos_dir_entry *de); extern int fat_flush_inodes(struct super_block *sb, struct inode *i1, struct inode *i2);
static inline unsigned long fat_dir_hash(int logstart) { return hash_32(logstart, FAT_HASH_BITS); }


steven j. magnanisteven j. magnani19100.00%2100.00%

extern int fat_add_cluster(struct inode *inode); /* fat/misc.c */ extern __printf(3, 4) __cold void __fat_fs_error(struct super_block *sb, int report, const char *fmt, ...); #define fat_fs_error(sb, fmt, args...) \ __fat_fs_error(sb, 1, fmt , ## args) #define fat_fs_error_ratelimit(sb, fmt, args...) \ __fat_fs_error(sb, __ratelimit(&MSDOS_SB(sb)->ratelimit), fmt , ## args) __printf(3, 4) __cold void fat_msg(struct super_block *sb, const char *level, const char *fmt, ...); #define fat_msg_ratelimit(sb, level, fmt, args...) \ do { \ if (__ratelimit(&MSDOS_SB(sb)->ratelimit)) \ fat_msg(sb, level, fmt, ## args); \ } while (0) extern int fat_clusters_flush(struct super_block *sb); extern int fat_chain_add(struct inode *inode, int new_dclus, int nr_cluster); extern void fat_time_fat2unix(struct msdos_sb_info *sbi, struct timespec *ts, __le16 __time, __le16 __date, u8 time_cs); extern void fat_time_unix2fat(struct msdos_sb_info *sbi, struct timespec *ts, __le16 *time, __le16 *date, u8 *time_cs); extern int fat_sync_bhs(struct buffer_head **bhs, int nr_bhs); int fat_cache_init(void); void fat_cache_destroy(void); /* fat/nfs.c */ extern const struct export_operations fat_export_ops; extern const struct export_operations fat_export_ops_nostale; /* helper for printk */ typedef unsigned long long llu; #endif /* !_FAT_H */

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Directory: fs/fat
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