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linux/fs/udf/udfdecl.h
Jan Kara 74584ae509 udf: fix possible leakage of blocks 
We have to take care that when we call udf_discard_prealloc() from
udf_clear_inode() we have to write inode ourselves afterwards (otherwise,
some changes might be lost leading to leakage of blocks, use of free blocks
or improperly aligned extents).

Also udf_discard_prealloc() does two different things - it removes
preallocated blocks and truncates the last extent to exactly match i_size.
We move the latter functionality to udf_truncate_tail_extent(), call
udf_discard_prealloc() when last reference to a file is dropped and call
udf_truncate_tail_extent() when inode is being removed from inode cache
(udf_clear_inode() call).

We cannot call udf_truncate_tail_extent() earlier as subsequent open+write
would find the last block of the file mapped and happily write to the end
of it, although the last extent says it's shorter.

[akpm@linux-foundation.org: Make checkpatch.pl happier]
Signed-off-by: Jan Kara <jack@suse.cz>
Cc: Eric Sandeen <sandeen@sandeen.net>
Cc: Cyrill Gorcunov <gorcunov@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-06-16 13:16:16 -07:00

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#ifndef __UDF_DECL_H
#define __UDF_DECL_H
#include <linux/udf_fs.h>
#include "ecma_167.h"
#include "osta_udf.h"
#include <linux/fs.h>
#include <linux/types.h>
#include <linux/udf_fs_i.h>
#include <linux/udf_fs_sb.h>
#include <linux/buffer_head.h>
#include "udfend.h"
#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
#define udf_file_entry_alloc_offset(inode)\
(UDF_I_USE(inode) ?\
sizeof(struct unallocSpaceEntry) :\
((UDF_I_EFE(inode) ?\
sizeof(struct extendedFileEntry) :\
sizeof(struct fileEntry)) + UDF_I_LENEATTR(inode)))
#define udf_ext0_offset(inode)\
(UDF_I_ALLOCTYPE(inode) == ICBTAG_FLAG_AD_IN_ICB ?\
udf_file_entry_alloc_offset(inode) : 0)
#define udf_get_lb_pblock(sb,loc,offset) udf_get_pblock((sb), (loc).logicalBlockNum, (loc).partitionReferenceNum, (offset))
struct dentry;
struct inode;
struct task_struct;
struct buffer_head;
struct super_block;
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
{
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;
kernel_lb_addr block;
};
/* super.c */
extern void udf_error(struct super_block *, const char *, const char *, ...);
extern void udf_warning(struct super_block *, const char *, const char *, ...);
/* 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 *, 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 *, kernel_long_ad *, sector_t);
extern int8_t inode_bmap(struct inode *, sector_t, struct extent_position *, kernel_lb_addr *, uint32_t *, sector_t *);
extern int8_t udf_add_aext(struct inode *, struct extent_position *, kernel_lb_addr, uint32_t, int);
extern int8_t udf_write_aext(struct inode *, struct extent_position *, kernel_lb_addr, uint32_t, int);
extern int8_t udf_delete_aext(struct inode *, struct extent_position, kernel_lb_addr, uint32_t);
extern int8_t udf_next_aext(struct inode *, struct extent_position *, kernel_lb_addr *, uint32_t *, int);
extern int8_t udf_current_aext(struct inode *, struct extent_position *, 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 *, 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 int udf_relocate_blocks(struct super_block *, long, long *);
/* 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 *, 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 *, 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 *, kernel_lb_addr *, uint32_t *, sector_t *);
extern struct fileIdentDesc * udf_get_fileident(void * buffer, int bufsize, int * offset);
extern long_ad * udf_get_filelongad(uint8_t *, int, int *, int);
extern short_ad * udf_get_fileshortad(uint8_t *, int, int *, int);
/* crc.c */
extern uint16_t udf_crc(uint8_t *, uint32_t, uint16_t);
/* udftime.c */
extern time_t *udf_stamp_to_time(time_t *, long *, kernel_timestamp);
extern kernel_timestamp *udf_time_to_stamp(kernel_timestamp *, struct timespec);
#endif /* __UDF_DECL_H */
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