201 lines
8.2 KiB
PHP
201 lines
8.2 KiB
PHP
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;static char *SCCSID = "@(#)tables.h 12.2 88/12/19";
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ifdef MASM
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BREAK <OFT - Open File Table>
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endif
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;* OFT - Open File Table
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;
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; The OFT contains file specific information which is independent
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; of an instance of use of the file.
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;
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; If the file is open for write access, we keep a pointer to
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; it's directory entry, not just it's
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; FNODE, so that we can update the length and modification time when it's
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; written.
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;
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; We store the directory's FNODE number and the file name, with these
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; we can find the directory entry again even if the directory has
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; been shuffled by creates or deletes of other files. Two advisorys
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; are kept - the Vsector number, cache block address, and cache block
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; offset of the actual directory entry. This information has three
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; levels of validity:
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;
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; 1) Vsector, header address, and offset are valid
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; you can find the dir entry easily
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; 2) the header address is invalid due to cache flushing.
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; Vsector # and offset are still valid, so read the
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; cache block and go directly to the entry
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; In this case the header address points to the wrong
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; Vsector
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; 3) the directory has been altered since we opened the file,
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; so none of this info is accurate. In this case the
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; directory alteration routines located this OFT
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; entry and zeroed the Vsector number. Go to the directory
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; and search the name again.
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;
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OFT struc
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OFT_P db (size DCHDR) dup (?) ; double chain of OFT structures, rooted in OFTHead[i]
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OFT_FHT db (size DCHDR) dup (?) ; double chain of FHT structures
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OFT_RLCK db (size DCHDR) dup (?) ; double chain of RECLOCK structures
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OFT_FN db (size SECPTR) dup (?) ; pointer to file FNODE
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OFT_SBD dw ? ; pointer to SBDIR structure
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OFT_DIRE db (size SECPTR) dup (?) ; pointer to directory block
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OFT_CCNT dd ? ; DB_CCNT value for OFT_DIRE to check OFT_DIRO validity
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OFT_FREEDCNT dd ? ; SD_FREEDCNT value for DIRE to be valid
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;
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; These length fields are used when writing the file.
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; The OFN_ entries will reflect the OFT_ALEN value. These
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; aren't updated in the FNODE until the file closes, whereup
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; they are trimmed back to OFT_LEN which is itself propigated
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; to the file's DIR entry. If write-through is set then the
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; OFN_ entries below will be propigated to the FNODE and
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; then to the disk, but if we crash the cleanup program
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; will deallocate the "extra" sectors.
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;
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OFT_LEN dd ? ; file actual length
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OFT_ALEN dd ? ; file allocated length (SECSIZE multiple)
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OFT_WLEN dd ? ; last byte+1 of valid data in the file
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; (optimization for writing into extended areas
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OFT_LAST dd ? ; Psector # of last sector in file, or 0
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OFT_LRP db (size SECPTR) dup (?) ; last run pointer. Valid if OFT_LAST !=0
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; if OFN_AB.ABF_NODE ==0 this is the address of
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; an OFN_SEC record in this OFT
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; else this is a SECPTR to the SIB
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; containing the last run record
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OFT_VOL dd ? ; pointer to VOLTAB for this guy
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OFT_NAME dd ? ; address of name string len byte
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; followed by name string itself
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; len doesn't include len byte
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OFT_DIRO dw ? ; offset into directory block for entry
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OFT_FILL dw ? ; unused, fill
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OFT_LCKCNT dw ? ; count of guys in OFT_RLCK
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OFT_WCNT dw ? ; # of threads blocked on this OFT
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; the following three fields are used to
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; control access. They're identical in use
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; to the equivalent fields in SBDIR. The
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; Flag byte only contains locking/holding
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; flags, so if DWORD PTR OFT_HCNT is 0 then
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; the OFT is known to be free and clear
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OFT_HCNT dw ? ; held count, has OTF_PND bit also
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OFT_DMY db ? ; unused, must be 0
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OFT_FLAG db ? ; flag byte, high order in OFT_HCNT dword
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OFT_WAITC dd ? ; head of wait chain if locked
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OFT_OPLOCK dd ? ; Oplock value, 0 if none
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OFT_BANDP dd ? ; pointer to BandTab structure in BandList
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; for our last allocation. =0 if unused
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; The following 5 fields hold the accumulation of all FHTs for this OFT.
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; This saves us from having to scan the FHTs to do a sharing check upon
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; open. An OFT is unused when OFT_RD and OFT_WT and OFT_FIND are zero
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OFT_RD dw ? ; # of opens for read
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OFT_WT dw ? ; # of opens for write
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OFT_DR dw ? ; # of opens with deny read
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OFT_DW dw ? ; # of opens with deny write
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OFT_COMPAT dw ? ; # of opens for compatibility mode
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OFT_FIND dw ? ; count of active FINDs using this OFT
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OFT_REALLYBAD db ? ; non-zero if file is unusable due to
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; corrupt disk BUGBUG - FOLD INTO BITS
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OFT_SFLAG db ? ; special flag byte
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OFT_DMY2 dw ? ; unused
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; BUGBUG - rearrange these fields for er offsets dw ?
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;
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; Info copied from the file's FNODE
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;
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; The ALLEAF blocks must follow the ALBLK value
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;
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OFN_AB db (size ALBLK) dup (?) ; allocation block structure
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OFN_ALREC db (8*size ALLEAF) dup (?) ; referenced from FN_AB
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OFT ends
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; flag bits for OFT_FLAG
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OTF_LCK equ 01h ; file is locked against access
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OTF_PLK equ 02h ; pending lock
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OTF_PSO equ 04h ; pending solo
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OTF_PND equ 80h ; lock pending bit
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; flag bits for OFT_SFLAG
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OFS_OPLK equ 01h ; oplocked
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OFS_OPBA equ 02h ; oplock BATCH flag set
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OFS_DASD equ 04h ; DASD file
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ifdef DEBUG
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OFS_SAC equ 08h ; supress OFT_ALEN debug check
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endif
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; The file storage information from the fnode is replicated
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; in the OFT. This saves us from having to blow a cache block
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; keeping the FNODE in ram for every open file. The FNODE
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; is only accessed when a file is open, and when it's closed.
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; (If write-through is set, it's accessed for every growth)
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;
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; These statements are to keep the FNODE and the OFT in sync.
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ifdef MASM
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.errnz (size OFN_ALREC - size FN_ALREC)
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endif
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;* FHT - File Handle Table
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;
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; The FHT contains per-handle informatiuon
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FHT struc
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FHT_SEEK dd ? ; seek pointer
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FHT_OFT dd ? ; pointer to OFT
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FHT_CHN db (size DCHDR) dup (?) ; chain of FHTs for an OFT
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FHT_UID dd ? ; UID and Session ID
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FHT_MODE dw ? ; mode bits from OPEN
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FHT_RAA dw ? ; read ahead advisory
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FHT_HINT dd ? ; hint flags
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FHT ends
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ifdef MASM
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.errnz FHT_CHN-OFT_FHT ; same offset used for both
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endif
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;* FHT_HINT flags
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FHH_SEQ equ 01 ; sequential file
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;* RecLock - Record Locking Records
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;
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; One record per lock, chained to the OFT. These are chained
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; in order RL_BEG
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;
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RECLOCK struc
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RL_BEG dd ? ; begining byte of locked range
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RL_END dd ? ; end byte of locked range
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RL_TYPE db ? ; =1 if read allowed, =0 if full lock
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RL_MEM db ? ; =0 if from heap, =1 if from special list
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RL_DMY dw ? ; padding
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RL_SPID dd ? ; Session/Pid
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RL_CHN db (size DCHDR) dup (?) ; double chain of RECLOCK structures
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RECLOCK ends
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ifdef MASM
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.errnz RL_CHN-OFT_RLCK ; must have same offset to work
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endif
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