/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _LINUX_SYSV_FS_H #define _LINUX_SYSV_FS_H #define __packed2__ … #ifndef __KERNEL__ typedef u16 __fs16; typedef u32 __fs16; #endif /* inode numbers are 16 bit */ sysv_ino_t; /* Block numbers are 24 bit, sometimes stored in 32 bit. On Coherent FS, they are always stored in PDP-11 manner: the least significant 16 bits come last. */ sysv_zone_t; /* 0 is non-existent */ #define SYSV_BADBL_INO … #define SYSV_ROOT_INO … /* Xenix super-block data on disk */ #define XENIX_NICINOD … #define XENIX_NICFREE … struct xenix_super_block { … }; /* * SystemV FS comes in two variants: * sysv2: System V Release 2 (e.g. Microport), structure elements aligned(2). * sysv4: System V Release 4 (e.g. Consensys), structure elements aligned(4). */ #define SYSV_NICINOD … #define SYSV_NICFREE … /* SystemV4 super-block data on disk */ struct sysv4_super_block { … }; /* SystemV2 super-block data on disk */ struct sysv2_super_block { … }; /* V7 super-block data on disk */ #define V7_NICINOD … #define V7_NICFREE … struct v7_super_block { … }; /* Constants to aid sanity checking */ /* This is not a hard limit, nor enforced by v7 kernel. It's actually just * the limit used by Seventh Edition's ls, though is high enough to assume * that no reasonable file system would have that much entries in root * directory. Thus, if we see anything higher, we just probably got the * endiannes wrong. */ #define V7_NFILES … /* The disk addresses are three-byte (despite direct block addresses being * aligned word-wise in inode). If the most significant byte is non-zero, * something is most likely wrong (not a filesystem, bad bytesex). */ #define V7_MAXSIZE … /* Coherent super-block data on disk */ #define COH_NICINOD … #define COH_NICFREE … struct coh_super_block { … }; /* SystemV/Coherent inode data on disk */ struct sysv_inode { … }; /* SystemV/Coherent directory entry on disk */ #define SYSV_NAMELEN … struct sysv_dir_entry { … }; #define SYSV_DIRSIZE … #endif /* _LINUX_SYSV_FS_H */
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