mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-27 11:15:07 +07:00
cac45b062c
makes ->d_hash() and ->d_compare() safety in RCU mode independent from vfsmount_lock. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
422 lines
14 KiB
C
422 lines
14 KiB
C
#ifndef _FAT_H
|
|
#define _FAT_H
|
|
|
|
#include <linux/buffer_head.h>
|
|
#include <linux/string.h>
|
|
#include <linux/nls.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/hash.h>
|
|
#include <linux/mutex.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 */
|
|
};
|
|
|
|
#define FAT_HASH_BITS 8
|
|
#define FAT_HASH_SIZE (1UL << FAT_HASH_BITS)
|
|
|
|
/*
|
|
* 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 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 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;
|
|
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;
|
|
}
|
|
|
|
static inline struct msdos_inode_info *MSDOS_I(struct inode *inode)
|
|
{
|
|
return container_of(inode, struct msdos_inode_info, vfs_inode);
|
|
}
|
|
|
|
/*
|
|
* 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;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
/* 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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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);
|
|
}
|
|
|
|
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
|
|
}
|
|
|
|
/* 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_bmap(struct inode *inode, sector_t sector, sector_t *phys,
|
|
unsigned long *mapped_blocks, int create);
|
|
|
|
/* 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;
|
|
}
|
|
|
|
static inline void fatent_set_entry(struct fat_entry *fatent, int entry)
|
|
{
|
|
fatent->entry = entry;
|
|
fatent->u.ent32_p = NULL;
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
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 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);
|
|
}
|
|
|
|
/* 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 */
|