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linux/fs/udf/udfdecl.h
Jan Kara 146bca72c7 udf: Don't write integrity descriptor too often 
We update information in logical volume integrity descriptor after each
allocation (as LVID contains free space, number of directories and files on
disk etc.). If the filesystem is on some phase change media, this leads to its
quick degradation as such media is able to handle only 10000 overwrites or so.
We solve the problem by writing new information into LVID only on umount,
remount-ro and sync. This solves the problem at the price of longer media
inconsistency (previously media became consistent after pdflush flushed dirty
LVID buffer) but that should be acceptable.

Report by and patch written in cooperation with
Rich Coe <Richard.Coe@med.ge.com>.

Signed-off-by: Jan Kara <jack@suse.cz>
2009-04-02 13:36:28 +02:00

247 lines
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C
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#ifndef __UDF_DECL_H
#define __UDF_DECL_H
#include "ecma_167.h"
#include "osta_udf.h"
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/buffer_head.h>
#include <linux/udf_fs_i.h>
#include "udf_sb.h"
#include "udfend.h"
#include "udf_i.h"
#define UDF_PREALLOCATE
#define UDF_DEFAULT_PREALLOC_BLOCKS 8
#undef UDFFS_DEBUG
#ifdef UDFFS_DEBUG
#define udf_debug(f, a...) \
do { \
printk(KERN_DEBUG "UDF-fs DEBUG %s:%d:%s: ", \
__FILE__, __LINE__, __func__); \
printk(f, ##a); \
} while (0)
#else
#define udf_debug(f, a...) /**/
#endif
#define udf_info(f, a...) \
printk(KERN_INFO "UDF-fs INFO " f, ##a);
#define udf_fixed_to_variable(x) ( ( ( (x) >> 5 ) * 39 ) + ( (x) & 0x0000001F ) )
#define udf_variable_to_fixed(x) ( ( ( (x) / 39 ) << 5 ) + ( (x) % 39 ) )
#define UDF_EXTENT_LENGTH_MASK 0x3FFFFFFF
#define UDF_EXTENT_FLAG_MASK 0xC0000000
#define UDF_NAME_PAD 4
#define UDF_NAME_LEN 256
#define UDF_PATH_LEN 1023
static inline size_t udf_file_entry_alloc_offset(struct inode *inode)
{
struct udf_inode_info *iinfo = UDF_I(inode);
if (iinfo->i_use)
return sizeof(struct unallocSpaceEntry);
else if (iinfo->i_efe)
return sizeof(struct extendedFileEntry) + iinfo->i_lenEAttr;
else
return sizeof(struct fileEntry) + iinfo->i_lenEAttr;
}
static inline size_t udf_ext0_offset(struct inode *inode)
{
if (UDF_I(inode)->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB)
return udf_file_entry_alloc_offset(inode);
else
return 0;
}
/* computes tag checksum */
u8 udf_tag_checksum(const struct tag *t);
struct dentry;
struct inode;
struct task_struct;
struct buffer_head;
struct super_block;
extern const struct export_operations udf_export_ops;
extern const struct inode_operations udf_dir_inode_operations;
extern const struct file_operations udf_dir_operations;
extern const struct inode_operations udf_file_inode_operations;
extern const struct file_operations udf_file_operations;
extern const struct address_space_operations udf_aops;
extern const struct address_space_operations udf_adinicb_aops;
extern const struct address_space_operations udf_symlink_aops;
struct udf_fileident_bh {
struct buffer_head *sbh;
struct buffer_head *ebh;
int soffset;
int eoffset;
};
struct udf_vds_record {
uint32_t block;
uint32_t volDescSeqNum;
};
struct generic_desc {
struct tag descTag;
__le32 volDescSeqNum;
};
struct ustr {
uint8_t u_cmpID;
uint8_t u_name[UDF_NAME_LEN - 2];
uint8_t u_len;
};
struct extent_position {
struct buffer_head *bh;
uint32_t offset;
struct kernel_lb_addr block;
};
/* super.c */
extern void udf_warning(struct super_block *, const char *, const char *, ...);
static inline void udf_updated_lvid(struct super_block *sb)
{
struct buffer_head *bh = UDF_SB(sb)->s_lvid_bh;
BUG_ON(!bh);
WARN_ON_ONCE(((struct logicalVolIntegrityDesc *)
bh->b_data)->integrityType !=
cpu_to_le32(LVID_INTEGRITY_TYPE_OPEN));
sb->s_dirt = 1;
UDF_SB(sb)->s_lvid_dirty = 1;
}
/* namei.c */
extern int udf_write_fi(struct inode *inode, struct fileIdentDesc *,
struct fileIdentDesc *, struct udf_fileident_bh *,
uint8_t *, uint8_t *);
/* file.c */
extern int udf_ioctl(struct inode *, struct file *, unsigned int,
unsigned long);
/* inode.c */
extern struct inode *udf_iget(struct super_block *, struct kernel_lb_addr *);
extern int udf_sync_inode(struct inode *);
extern void udf_expand_file_adinicb(struct inode *, int, int *);
extern struct buffer_head *udf_expand_dir_adinicb(struct inode *, int *, int *);
extern struct buffer_head *udf_bread(struct inode *, int, int, int *);
extern void udf_truncate(struct inode *);
extern void udf_read_inode(struct inode *);
extern void udf_delete_inode(struct inode *);
extern void udf_clear_inode(struct inode *);
extern int udf_write_inode(struct inode *, int);
extern long udf_block_map(struct inode *, sector_t);
extern int udf_extend_file(struct inode *, struct extent_position *,
struct kernel_long_ad *, sector_t);
extern int8_t inode_bmap(struct inode *, sector_t, struct extent_position *,
struct kernel_lb_addr *, uint32_t *, sector_t *);
extern int8_t udf_add_aext(struct inode *, struct extent_position *,
struct kernel_lb_addr *, uint32_t, int);
extern int8_t udf_write_aext(struct inode *, struct extent_position *,
struct kernel_lb_addr *, uint32_t, int);
extern int8_t udf_delete_aext(struct inode *, struct extent_position,
struct kernel_lb_addr, uint32_t);
extern int8_t udf_next_aext(struct inode *, struct extent_position *,
struct kernel_lb_addr *, uint32_t *, int);
extern int8_t udf_current_aext(struct inode *, struct extent_position *,
struct kernel_lb_addr *, uint32_t *, int);
/* misc.c */
extern struct buffer_head *udf_tgetblk(struct super_block *, int);
extern struct buffer_head *udf_tread(struct super_block *, int);
extern struct genericFormat *udf_add_extendedattr(struct inode *, uint32_t,
uint32_t, uint8_t);
extern struct genericFormat *udf_get_extendedattr(struct inode *, uint32_t,
uint8_t);
extern struct buffer_head *udf_read_tagged(struct super_block *, uint32_t,
uint32_t, uint16_t *);
extern struct buffer_head *udf_read_ptagged(struct super_block *,
struct kernel_lb_addr *, uint32_t,
uint16_t *);
extern void udf_update_tag(char *, int);
extern void udf_new_tag(char *, uint16_t, uint16_t, uint16_t, uint32_t, int);
/* lowlevel.c */
extern unsigned int udf_get_last_session(struct super_block *);
extern unsigned long udf_get_last_block(struct super_block *);
/* partition.c */
extern uint32_t udf_get_pblock(struct super_block *, uint32_t, uint16_t,
uint32_t);
extern uint32_t udf_get_pblock_virt15(struct super_block *, uint32_t, uint16_t,
uint32_t);
extern uint32_t udf_get_pblock_virt20(struct super_block *, uint32_t, uint16_t,
uint32_t);
extern uint32_t udf_get_pblock_spar15(struct super_block *, uint32_t, uint16_t,
uint32_t);
extern uint32_t udf_get_pblock_meta25(struct super_block *, uint32_t, uint16_t,
uint32_t);
extern int udf_relocate_blocks(struct super_block *, long, long *);
static inline uint32_t
udf_get_lb_pblock(struct super_block *sb, struct kernel_lb_addr *loc,
uint32_t offset)
{
return udf_get_pblock(sb, loc->logicalBlockNum,
loc->partitionReferenceNum, offset);
}
/* unicode.c */
extern int udf_get_filename(struct super_block *, uint8_t *, uint8_t *, int);
extern int udf_put_filename(struct super_block *, const uint8_t *, uint8_t *,
int);
extern int udf_build_ustr(struct ustr *, dstring *, int);
extern int udf_CS0toUTF8(struct ustr *, const struct ustr *);
/* ialloc.c */
extern void udf_free_inode(struct inode *);
extern struct inode *udf_new_inode(struct inode *, int, int *);
/* truncate.c */
extern void udf_truncate_tail_extent(struct inode *);
extern void udf_discard_prealloc(struct inode *);
extern void udf_truncate_extents(struct inode *);
/* balloc.c */
extern void udf_free_blocks(struct super_block *, struct inode *,
struct kernel_lb_addr *, uint32_t, uint32_t);
extern int udf_prealloc_blocks(struct super_block *, struct inode *, uint16_t,
uint32_t, uint32_t);
extern int udf_new_block(struct super_block *, struct inode *, uint16_t,
uint32_t, int *);
/* fsync.c */
extern int udf_fsync_file(struct file *, struct dentry *, int);
/* directory.c */
extern struct fileIdentDesc *udf_fileident_read(struct inode *, loff_t *,
struct udf_fileident_bh *,
struct fileIdentDesc *,
struct extent_position *,
struct kernel_lb_addr *, uint32_t *,
sector_t *);
extern struct fileIdentDesc *udf_get_fileident(void *buffer, int bufsize,
int *offset);
extern struct long_ad *udf_get_filelongad(uint8_t *, int, uint32_t *, int);
extern struct short_ad *udf_get_fileshortad(uint8_t *, int, uint32_t *, int);
/* udftime.c */
extern struct timespec *udf_disk_stamp_to_time(struct timespec *dest,
struct timestamp src);
extern struct timestamp *udf_time_to_disk_stamp(struct timestamp *dest, struct timespec src);
#endif /* __UDF_DECL_H */
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