mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2024-11-26 05:34:13 +08:00
3fc131663c
The current codebase makes use of the zero-length array language
extension to the C90 standard, but the preferred mechanism to declare
variable-length types such as these ones is a flexible array member[1][2],
introduced in C99:
struct foo {
int stuff;
struct boo array[];
};
By making use of the mechanism above, we will get a compiler warning
in case the flexible array does not occur last in the structure, which
will help us prevent some kind of undefined behavior bugs from being
inadvertently introduced[3] to the codebase from now on.
Also, notice that, dynamic memory allocations won't be affected by
this change:
"Flexible array members have incomplete type, and so the sizeof operator
may not be applied. As a quirk of the original implementation of
zero-length arrays, sizeof evaluates to zero."[1]
This issue was found with the help of Coccinelle.
[1] https://gcc.gnu.org/onlinedocs/gcc/Zero-Length.html
[2] https://github.com/KSPP/linux/issues/21
[3] commit 7649773293 ("cxgb3/l2t: Fix undefined behaviour")
Link: https://lore.kernel.org/r/20200309202715.GA9428@embeddedor
Signed-off-by: Gustavo A. R. Silva <gustavo@embeddedor.com>
Signed-off-by: Jan Kara <jack@suse.cz>
182 lines
4.1 KiB
C
182 lines
4.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef __LINUX_UDF_SB_H
|
|
#define __LINUX_UDF_SB_H
|
|
|
|
#include <linux/mutex.h>
|
|
#include <linux/bitops.h>
|
|
#include <linux/magic.h>
|
|
|
|
#define UDF_MAX_READ_VERSION 0x0250
|
|
#define UDF_MAX_WRITE_VERSION 0x0201
|
|
|
|
#define UDF_FLAG_USE_EXTENDED_FE 0
|
|
#define UDF_VERS_USE_EXTENDED_FE 0x0200
|
|
#define UDF_FLAG_USE_STREAMS 1
|
|
#define UDF_VERS_USE_STREAMS 0x0200
|
|
#define UDF_FLAG_USE_SHORT_AD 2
|
|
#define UDF_FLAG_USE_AD_IN_ICB 3
|
|
#define UDF_FLAG_USE_FILE_CTIME_EA 4
|
|
#define UDF_FLAG_STRICT 5
|
|
#define UDF_FLAG_UNDELETE 6
|
|
#define UDF_FLAG_UNHIDE 7
|
|
#define UDF_FLAG_VARCONV 8
|
|
#define UDF_FLAG_NLS_MAP 9
|
|
#define UDF_FLAG_UTF8 10
|
|
#define UDF_FLAG_UID_FORGET 11 /* save -1 for uid to disk */
|
|
#define UDF_FLAG_GID_FORGET 12
|
|
#define UDF_FLAG_UID_SET 13
|
|
#define UDF_FLAG_GID_SET 14
|
|
#define UDF_FLAG_SESSION_SET 15
|
|
#define UDF_FLAG_LASTBLOCK_SET 16
|
|
#define UDF_FLAG_BLOCKSIZE_SET 17
|
|
#define UDF_FLAG_INCONSISTENT 18
|
|
#define UDF_FLAG_RW_INCOMPAT 19 /* Set when we find RW incompatible
|
|
* feature */
|
|
|
|
#define UDF_PART_FLAG_UNALLOC_BITMAP 0x0001
|
|
#define UDF_PART_FLAG_UNALLOC_TABLE 0x0002
|
|
#define UDF_PART_FLAG_READ_ONLY 0x0010
|
|
#define UDF_PART_FLAG_WRITE_ONCE 0x0020
|
|
#define UDF_PART_FLAG_REWRITABLE 0x0040
|
|
#define UDF_PART_FLAG_OVERWRITABLE 0x0080
|
|
|
|
#define UDF_MAX_BLOCK_LOADED 8
|
|
|
|
#define UDF_TYPE1_MAP15 0x1511U
|
|
#define UDF_VIRTUAL_MAP15 0x1512U
|
|
#define UDF_VIRTUAL_MAP20 0x2012U
|
|
#define UDF_SPARABLE_MAP15 0x1522U
|
|
#define UDF_METADATA_MAP25 0x2511U
|
|
|
|
#define UDF_INVALID_MODE ((umode_t)-1)
|
|
|
|
#define MF_DUPLICATE_MD 0x01
|
|
#define MF_MIRROR_FE_LOADED 0x02
|
|
|
|
struct udf_meta_data {
|
|
__u32 s_meta_file_loc;
|
|
__u32 s_mirror_file_loc;
|
|
__u32 s_bitmap_file_loc;
|
|
__u32 s_alloc_unit_size;
|
|
__u16 s_align_unit_size;
|
|
/*
|
|
* Partition Reference Number of the associated physical / sparable
|
|
* partition
|
|
*/
|
|
__u16 s_phys_partition_ref;
|
|
int s_flags;
|
|
struct inode *s_metadata_fe;
|
|
struct inode *s_mirror_fe;
|
|
struct inode *s_bitmap_fe;
|
|
};
|
|
|
|
struct udf_sparing_data {
|
|
__u16 s_packet_len;
|
|
struct buffer_head *s_spar_map[4];
|
|
};
|
|
|
|
struct udf_virtual_data {
|
|
__u32 s_num_entries;
|
|
__u16 s_start_offset;
|
|
};
|
|
|
|
struct udf_bitmap {
|
|
__u32 s_extPosition;
|
|
int s_nr_groups;
|
|
struct buffer_head *s_block_bitmap[];
|
|
};
|
|
|
|
struct udf_part_map {
|
|
union {
|
|
struct udf_bitmap *s_bitmap;
|
|
struct inode *s_table;
|
|
} s_uspace;
|
|
__u32 s_partition_root;
|
|
__u32 s_partition_len;
|
|
__u16 s_partition_type;
|
|
__u16 s_partition_num;
|
|
union {
|
|
struct udf_sparing_data s_sparing;
|
|
struct udf_virtual_data s_virtual;
|
|
struct udf_meta_data s_metadata;
|
|
} s_type_specific;
|
|
__u32 (*s_partition_func)(struct super_block *, __u32, __u16, __u32);
|
|
__u16 s_volumeseqnum;
|
|
__u16 s_partition_flags;
|
|
};
|
|
|
|
#pragma pack()
|
|
|
|
struct udf_sb_info {
|
|
struct udf_part_map *s_partmaps;
|
|
__u8 s_volume_ident[32];
|
|
|
|
/* Overall info */
|
|
__u16 s_partitions;
|
|
__u16 s_partition;
|
|
|
|
/* Sector headers */
|
|
__s32 s_session;
|
|
__u32 s_anchor;
|
|
__u32 s_last_block;
|
|
|
|
struct buffer_head *s_lvid_bh;
|
|
|
|
/* Default permissions */
|
|
umode_t s_umask;
|
|
kgid_t s_gid;
|
|
kuid_t s_uid;
|
|
umode_t s_fmode;
|
|
umode_t s_dmode;
|
|
/* Lock protecting consistency of above permission settings */
|
|
rwlock_t s_cred_lock;
|
|
|
|
/* Root Info */
|
|
struct timespec64 s_record_time;
|
|
|
|
/* Fileset Info */
|
|
__u16 s_serial_number;
|
|
|
|
/* highest UDF revision we have recorded to this media */
|
|
__u16 s_udfrev;
|
|
|
|
/* Miscellaneous flags */
|
|
unsigned long s_flags;
|
|
|
|
/* Encoding info */
|
|
struct nls_table *s_nls_map;
|
|
|
|
/* VAT inode */
|
|
struct inode *s_vat_inode;
|
|
|
|
struct mutex s_alloc_mutex;
|
|
/* Protected by s_alloc_mutex */
|
|
unsigned int s_lvid_dirty;
|
|
};
|
|
|
|
static inline struct udf_sb_info *UDF_SB(struct super_block *sb)
|
|
{
|
|
return sb->s_fs_info;
|
|
}
|
|
|
|
struct logicalVolIntegrityDescImpUse *udf_sb_lvidiu(struct super_block *sb);
|
|
|
|
int udf_compute_nr_groups(struct super_block *sb, u32 partition);
|
|
|
|
static inline int UDF_QUERY_FLAG(struct super_block *sb, int flag)
|
|
{
|
|
return test_bit(flag, &UDF_SB(sb)->s_flags);
|
|
}
|
|
|
|
static inline void UDF_SET_FLAG(struct super_block *sb, int flag)
|
|
{
|
|
set_bit(flag, &UDF_SB(sb)->s_flags);
|
|
}
|
|
|
|
static inline void UDF_CLEAR_FLAG(struct super_block *sb, int flag)
|
|
{
|
|
clear_bit(flag, &UDF_SB(sb)->s_flags);
|
|
}
|
|
|
|
#endif /* __LINUX_UDF_SB_H */
|