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0001 /* SPDX-License-Identifier: GPL-2.0 */
0002 #ifndef _SYSV_H
0003 #define _SYSV_H
0004 
0005 #include <linux/buffer_head.h>
0006 
0007 typedef __u16 __bitwise __fs16;
0008 typedef __u32 __bitwise __fs32;
0009 
0010 #include <linux/sysv_fs.h>
0011 
0012 /*
0013  * SystemV/V7/Coherent super-block data in memory
0014  *
0015  * The SystemV/V7/Coherent superblock contains dynamic data (it gets modified
0016  * while the system is running). This is in contrast to the Minix and Berkeley
0017  * filesystems (where the superblock is never modified). This affects the
0018  * sync() operation: we must keep the superblock in a disk buffer and use this
0019  * one as our "working copy".
0020  */
0021 
0022 struct sysv_sb_info {
0023     struct super_block *s_sb;   /* VFS superblock */
0024     int        s_type;      /* file system type: FSTYPE_{XENIX|SYSV|COH} */
0025     char           s_bytesex;   /* bytesex (le/be/pdp) */
0026     unsigned int   s_inodes_per_block;  /* number of inodes per block */
0027     unsigned int   s_inodes_per_block_1;    /* inodes_per_block - 1 */
0028     unsigned int   s_inodes_per_block_bits; /* log2(inodes_per_block) */
0029     unsigned int   s_ind_per_block;     /* number of indirections per block */
0030     unsigned int   s_ind_per_block_bits;    /* log2(ind_per_block) */
0031     unsigned int   s_ind_per_block_2;   /* ind_per_block ^ 2 */
0032     unsigned int   s_toobig_block;      /* 10 + ipb + ipb^2 + ipb^3 */
0033     unsigned int   s_block_base;    /* physical block number of block 0 */
0034     unsigned short s_fic_size;  /* free inode cache size, NICINOD */
0035     unsigned short s_flc_size;  /* free block list chunk size, NICFREE */
0036     /* The superblock is kept in one or two disk buffers: */
0037     struct buffer_head *s_bh1;
0038     struct buffer_head *s_bh2;
0039     /* These are pointers into the disk buffer, to compensate for
0040        different superblock layout. */
0041     char *         s_sbd1;      /* entire superblock data, for part 1 */
0042     char *         s_sbd2;      /* entire superblock data, for part 2 */
0043     __fs16         *s_sb_fic_count; /* pointer to s_sbd->s_ninode */
0044         sysv_ino_t     *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */
0045     __fs16         *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */
0046     __fs16         *s_bcache_count; /* pointer to s_sbd->s_nfree */
0047     sysv_zone_t    *s_bcache;   /* pointer to s_sbd->s_free */
0048     __fs32         *s_free_blocks;  /* pointer to s_sbd->s_tfree */
0049     __fs32         *s_sb_time;  /* pointer to s_sbd->s_time */
0050     __fs32         *s_sb_state; /* pointer to s_sbd->s_state, only FSTYPE_SYSV */
0051     /* We keep those superblock entities that don't change here;
0052        this saves us an indirection and perhaps a conversion. */
0053     u32            s_firstinodezone; /* index of first inode zone */
0054     u32            s_firstdatazone; /* same as s_sbd->s_isize */
0055     u32            s_ninodes;   /* total number of inodes */
0056     u32            s_ndatazones;    /* total number of data zones */
0057     u32            s_nzones;    /* same as s_sbd->s_fsize */
0058     u16        s_namelen;       /* max length of dir entry */
0059     int        s_forced_ro;
0060     struct mutex s_lock;
0061 };
0062 
0063 /*
0064  * SystemV/V7/Coherent FS inode data in memory
0065  */
0066 struct sysv_inode_info {
0067     __fs32      i_data[13];
0068     u32     i_dir_start_lookup;
0069     struct inode    vfs_inode;
0070 };
0071 
0072 
0073 static inline struct sysv_inode_info *SYSV_I(struct inode *inode)
0074 {
0075     return container_of(inode, struct sysv_inode_info, vfs_inode);
0076 }
0077 
0078 static inline struct sysv_sb_info *SYSV_SB(struct super_block *sb)
0079 {
0080     return sb->s_fs_info;
0081 }
0082 
0083 
0084 /* identify the FS in memory */
0085 enum {
0086     FSTYPE_NONE = 0,
0087     FSTYPE_XENIX,
0088     FSTYPE_SYSV4,
0089     FSTYPE_SYSV2,
0090     FSTYPE_COH,
0091     FSTYPE_V7,
0092     FSTYPE_AFS,
0093     FSTYPE_END,
0094 };
0095 
0096 #define SYSV_MAGIC_BASE     0x012FF7B3
0097 
0098 #define XENIX_SUPER_MAGIC   (SYSV_MAGIC_BASE+FSTYPE_XENIX)
0099 #define SYSV4_SUPER_MAGIC   (SYSV_MAGIC_BASE+FSTYPE_SYSV4)
0100 #define SYSV2_SUPER_MAGIC   (SYSV_MAGIC_BASE+FSTYPE_SYSV2)
0101 #define COH_SUPER_MAGIC     (SYSV_MAGIC_BASE+FSTYPE_COH)
0102 
0103 
0104 /* Admissible values for i_nlink: 0.._LINK_MAX */
0105 enum {
0106     XENIX_LINK_MAX  =   126,    /* ?? */
0107     SYSV_LINK_MAX   =   126,    /* 127? 251? */
0108     V7_LINK_MAX     =   126,    /* ?? */
0109     COH_LINK_MAX    =   10000,
0110 };
0111 
0112 
0113 static inline void dirty_sb(struct super_block *sb)
0114 {
0115     struct sysv_sb_info *sbi = SYSV_SB(sb);
0116 
0117     mark_buffer_dirty(sbi->s_bh1);
0118     if (sbi->s_bh1 != sbi->s_bh2)
0119         mark_buffer_dirty(sbi->s_bh2);
0120 }
0121 
0122 
0123 /* ialloc.c */
0124 extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned,
0125             struct buffer_head **);
0126 extern struct inode * sysv_new_inode(const struct inode *, umode_t);
0127 extern void sysv_free_inode(struct inode *);
0128 extern unsigned long sysv_count_free_inodes(struct super_block *);
0129 
0130 /* balloc.c */
0131 extern sysv_zone_t sysv_new_block(struct super_block *);
0132 extern void sysv_free_block(struct super_block *, sysv_zone_t);
0133 extern unsigned long sysv_count_free_blocks(struct super_block *);
0134 
0135 /* itree.c */
0136 extern void sysv_truncate(struct inode *);
0137 extern int sysv_prepare_chunk(struct page *page, loff_t pos, unsigned len);
0138 
0139 /* inode.c */
0140 extern struct inode *sysv_iget(struct super_block *, unsigned int);
0141 extern int sysv_write_inode(struct inode *, struct writeback_control *wbc);
0142 extern int sysv_sync_inode(struct inode *);
0143 extern void sysv_set_inode(struct inode *, dev_t);
0144 extern int sysv_getattr(struct user_namespace *, const struct path *,
0145             struct kstat *, u32, unsigned int);
0146 extern int sysv_init_icache(void);
0147 extern void sysv_destroy_icache(void);
0148 
0149 
0150 /* dir.c */
0151 extern struct sysv_dir_entry *sysv_find_entry(struct dentry *, struct page **);
0152 extern int sysv_add_link(struct dentry *, struct inode *);
0153 extern int sysv_delete_entry(struct sysv_dir_entry *, struct page *);
0154 extern int sysv_make_empty(struct inode *, struct inode *);
0155 extern int sysv_empty_dir(struct inode *);
0156 extern void sysv_set_link(struct sysv_dir_entry *, struct page *,
0157             struct inode *);
0158 extern struct sysv_dir_entry *sysv_dotdot(struct inode *, struct page **);
0159 extern ino_t sysv_inode_by_name(struct dentry *);
0160 
0161 
0162 extern const struct inode_operations sysv_file_inode_operations;
0163 extern const struct inode_operations sysv_dir_inode_operations;
0164 extern const struct file_operations sysv_file_operations;
0165 extern const struct file_operations sysv_dir_operations;
0166 extern const struct address_space_operations sysv_aops;
0167 extern const struct super_operations sysv_sops;
0168 
0169 
0170 enum {
0171     BYTESEX_LE,
0172     BYTESEX_PDP,
0173     BYTESEX_BE,
0174 };
0175 
0176 static inline u32 PDP_swab(u32 x)
0177 {
0178 #ifdef __LITTLE_ENDIAN
0179     return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16);
0180 #else
0181 #ifdef __BIG_ENDIAN
0182     return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8);
0183 #else
0184 #error BYTESEX
0185 #endif
0186 #endif
0187 }
0188 
0189 static inline __u32 fs32_to_cpu(struct sysv_sb_info *sbi, __fs32 n)
0190 {
0191     if (sbi->s_bytesex == BYTESEX_PDP)
0192         return PDP_swab((__force __u32)n);
0193     else if (sbi->s_bytesex == BYTESEX_LE)
0194         return le32_to_cpu((__force __le32)n);
0195     else
0196         return be32_to_cpu((__force __be32)n);
0197 }
0198 
0199 static inline __fs32 cpu_to_fs32(struct sysv_sb_info *sbi, __u32 n)
0200 {
0201     if (sbi->s_bytesex == BYTESEX_PDP)
0202         return (__force __fs32)PDP_swab(n);
0203     else if (sbi->s_bytesex == BYTESEX_LE)
0204         return (__force __fs32)cpu_to_le32(n);
0205     else
0206         return (__force __fs32)cpu_to_be32(n);
0207 }
0208 
0209 static inline __fs32 fs32_add(struct sysv_sb_info *sbi, __fs32 *n, int d)
0210 {
0211     if (sbi->s_bytesex == BYTESEX_PDP)
0212         *(__u32*)n = PDP_swab(PDP_swab(*(__u32*)n)+d);
0213     else if (sbi->s_bytesex == BYTESEX_LE)
0214         le32_add_cpu((__le32 *)n, d);
0215     else
0216         be32_add_cpu((__be32 *)n, d);
0217     return *n;
0218 }
0219 
0220 static inline __u16 fs16_to_cpu(struct sysv_sb_info *sbi, __fs16 n)
0221 {
0222     if (sbi->s_bytesex != BYTESEX_BE)
0223         return le16_to_cpu((__force __le16)n);
0224     else
0225         return be16_to_cpu((__force __be16)n);
0226 }
0227 
0228 static inline __fs16 cpu_to_fs16(struct sysv_sb_info *sbi, __u16 n)
0229 {
0230     if (sbi->s_bytesex != BYTESEX_BE)
0231         return (__force __fs16)cpu_to_le16(n);
0232     else
0233         return (__force __fs16)cpu_to_be16(n);
0234 }
0235 
0236 static inline __fs16 fs16_add(struct sysv_sb_info *sbi, __fs16 *n, int d)
0237 {
0238     if (sbi->s_bytesex != BYTESEX_BE)
0239         le16_add_cpu((__le16 *)n, d);
0240     else
0241         be16_add_cpu((__be16 *)n, d);
0242     return *n;
0243 }
0244 
0245 #endif /* _SYSV_H */
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