/* SPDX-License-Identifier: GPL-2.0 */ #ifndef _SYSV_H #define _SYSV_H #include typedef __u16 __bitwise __fs16; typedef __u32 __bitwise __fs32; #include /* * SystemV/V7/Coherent super-block data in memory * * The SystemV/V7/Coherent superblock contains dynamic data (it gets modified * while the system is running). This is in contrast to the Minix and Berkeley * filesystems (where the superblock is never modified). This affects the * sync() operation: we must keep the superblock in a disk buffer and use this * one as our "working copy". */ struct sysv_sb_info { struct super_block *s_sb; /* VFS superblock */ int s_type; /* file system type: FSTYPE_{XENIX|SYSV|COH} */ char s_bytesex; /* bytesex (le/be/pdp) */ unsigned int s_inodes_per_block; /* number of inodes per block */ unsigned int s_inodes_per_block_1; /* inodes_per_block - 1 */ unsigned int s_inodes_per_block_bits; /* log2(inodes_per_block) */ unsigned int s_ind_per_block; /* number of indirections per block */ unsigned int s_ind_per_block_bits; /* log2(ind_per_block) */ unsigned int s_ind_per_block_2; /* ind_per_block ^ 2 */ unsigned int s_toobig_block; /* 10 + ipb + ipb^2 + ipb^3 */ unsigned int s_block_base; /* physical block number of block 0 */ unsigned short s_fic_size; /* free inode cache size, NICINOD */ unsigned short s_flc_size; /* free block list chunk size, NICFREE */ /* The superblock is kept in one or two disk buffers: */ struct buffer_head *s_bh1; struct buffer_head *s_bh2; /* These are pointers into the disk buffer, to compensate for different superblock layout. */ char * s_sbd1; /* entire superblock data, for part 1 */ char * s_sbd2; /* entire superblock data, for part 2 */ __fs16 *s_sb_fic_count; /* pointer to s_sbd->s_ninode */ sysv_ino_t *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */ __fs16 *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */ __fs16 *s_bcache_count; /* pointer to s_sbd->s_nfree */ sysv_zone_t *s_bcache; /* pointer to s_sbd->s_free */ __fs32 *s_free_blocks; /* pointer to s_sbd->s_tfree */ __fs32 *s_sb_time; /* pointer to s_sbd->s_time */ __fs32 *s_sb_state; /* pointer to s_sbd->s_state, only FSTYPE_SYSV */ /* We keep those superblock entities that don't change here; this saves us an indirection and perhaps a conversion. */ u32 s_firstinodezone; /* index of first inode zone */ u32 s_firstdatazone; /* same as s_sbd->s_isize */ u32 s_ninodes; /* total number of inodes */ u32 s_ndatazones; /* total number of data zones */ u32 s_nzones; /* same as s_sbd->s_fsize */ u16 s_namelen; /* max length of dir entry */ int s_forced_ro; struct mutex s_lock; }; /* * SystemV/V7/Coherent FS inode data in memory */ struct sysv_inode_info { __fs32 i_data[13]; u32 i_dir_start_lookup; struct inode vfs_inode; }; static inline struct sysv_inode_info *SYSV_I(struct inode *inode) { return container_of(inode, struct sysv_inode_info, vfs_inode); } static inline struct sysv_sb_info *SYSV_SB(struct super_block *sb) { return sb->s_fs_info; } /* identify the FS in memory */ enum { FSTYPE_NONE = 0, FSTYPE_XENIX, FSTYPE_SYSV4, FSTYPE_SYSV2, FSTYPE_COH, FSTYPE_V7, FSTYPE_AFS, FSTYPE_END, }; #define SYSV_MAGIC_BASE 0x012FF7B3 #define XENIX_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_XENIX) #define SYSV4_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV4) #define SYSV2_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_SYSV2) #define COH_SUPER_MAGIC (SYSV_MAGIC_BASE+FSTYPE_COH) /* Admissible values for i_nlink: 0.._LINK_MAX */ enum { XENIX_LINK_MAX = 126, /* ?? */ SYSV_LINK_MAX = 126, /* 127? 251? */ V7_LINK_MAX = 126, /* ?? */ COH_LINK_MAX = 10000, }; static inline void dirty_sb(struct super_block *sb) { struct sysv_sb_info *sbi = SYSV_SB(sb); mark_buffer_dirty(sbi->s_bh1); if (sbi->s_bh1 != sbi->s_bh2) mark_buffer_dirty(sbi->s_bh2); } /* ialloc.c */ extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned, struct buffer_head **); extern struct inode * sysv_new_inode(const struct inode *, umode_t); extern void sysv_free_inode(struct inode *); extern unsigned long sysv_count_free_inodes(struct super_block *); /* balloc.c */ extern sysv_zone_t sysv_new_block(struct super_block *); extern void sysv_free_block(struct super_block *, sysv_zone_t); extern unsigned long sysv_count_free_blocks(struct super_block *); /* itree.c */ void sysv_truncate(struct inode *); int sysv_prepare_chunk(struct folio *folio, loff_t pos, unsigned len); /* inode.c */ extern struct inode *sysv_iget(struct super_block *, unsigned int); extern int sysv_write_inode(struct inode *, struct writeback_control *wbc); extern int sysv_sync_inode(struct inode *); extern void sysv_set_inode(struct inode *, dev_t); extern int sysv_getattr(struct mnt_idmap *, const struct path *, struct kstat *, u32, unsigned int); extern int sysv_init_icache(void); extern void sysv_destroy_icache(void); /* dir.c */ struct sysv_dir_entry *sysv_find_entry(struct dentry *, struct folio **); int sysv_add_link(struct dentry *, struct inode *); int sysv_delete_entry(struct sysv_dir_entry *, struct folio *); int sysv_make_empty(struct inode *, struct inode *); int sysv_empty_dir(struct inode *); int sysv_set_link(struct sysv_dir_entry *, struct folio *, struct inode *); struct sysv_dir_entry *sysv_dotdot(struct inode *, struct folio **); ino_t sysv_inode_by_name(struct dentry *); extern const struct inode_operations sysv_file_inode_operations; extern const struct inode_operations sysv_dir_inode_operations; extern const struct file_operations sysv_file_operations; extern const struct file_operations sysv_dir_operations; extern const struct address_space_operations sysv_aops; extern const struct super_operations sysv_sops; enum { BYTESEX_LE, BYTESEX_PDP, BYTESEX_BE, }; static inline u32 PDP_swab(u32 x) { #ifdef __LITTLE_ENDIAN return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16); #else #ifdef __BIG_ENDIAN return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8); #else #error BYTESEX #endif #endif } static inline __u32 fs32_to_cpu(struct sysv_sb_info *sbi, __fs32 n) { if (sbi->s_bytesex == BYTESEX_PDP) return PDP_swab((__force __u32)n); else if (sbi->s_bytesex == BYTESEX_LE) return le32_to_cpu((__force __le32)n); else return be32_to_cpu((__force __be32)n); } static inline __fs32 cpu_to_fs32(struct sysv_sb_info *sbi, __u32 n) { if (sbi->s_bytesex == BYTESEX_PDP) return (__force __fs32)PDP_swab(n); else if (sbi->s_bytesex == BYTESEX_LE) return (__force __fs32)cpu_to_le32(n); else return (__force __fs32)cpu_to_be32(n); } static inline __fs32 fs32_add(struct sysv_sb_info *sbi, __fs32 *n, int d) { if (sbi->s_bytesex == BYTESEX_PDP) *(__u32*)n = PDP_swab(PDP_swab(*(__u32*)n)+d); else if (sbi->s_bytesex == BYTESEX_LE) le32_add_cpu((__le32 *)n, d); else be32_add_cpu((__be32 *)n, d); return *n; } static inline __u16 fs16_to_cpu(struct sysv_sb_info *sbi, __fs16 n) { if (sbi->s_bytesex != BYTESEX_BE) return le16_to_cpu((__force __le16)n); else return be16_to_cpu((__force __be16)n); } static inline __fs16 cpu_to_fs16(struct sysv_sb_info *sbi, __u16 n) { if (sbi->s_bytesex != BYTESEX_BE) return (__force __fs16)cpu_to_le16(n); else return (__force __fs16)cpu_to_be16(n); } static inline __fs16 fs16_add(struct sysv_sb_info *sbi, __fs16 *n, int d) { if (sbi->s_bytesex != BYTESEX_BE) le16_add_cpu((__le16 *)n, d); else be16_add_cpu((__be16 *)n, d); return *n; } #endif /* _SYSV_H */