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Linux/fs/sysv/sysv.h

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  1 /* SPDX-License-Identifier: GPL-2.0 */
  2 #ifndef _SYSV_H
  3 #define _SYSV_H
  4 
  5 #include <linux/buffer_head.h>
  6 
  7 typedef __u16 __bitwise __fs16;
  8 typedef __u32 __bitwise __fs32;
  9 
 10 #include <linux/sysv_fs.h>
 11 
 12 /*
 13  * SystemV/V7/Coherent super-block data in memory
 14  *
 15  * The SystemV/V7/Coherent superblock contains dynamic data (it gets modified
 16  * while the system is running). This is in contrast to the Minix and Berkeley
 17  * filesystems (where the superblock is never modified). This affects the
 18  * sync() operation: we must keep the superblock in a disk buffer and use this
 19  * one as our "working copy".
 20  */
 21 
 22 struct sysv_sb_info {
 23         struct super_block *s_sb;       /* VFS superblock */
 24         int            s_type;          /* file system type: FSTYPE_{XENIX|SYSV|COH} */
 25         char           s_bytesex;       /* bytesex (le/be/pdp) */
 26         unsigned int   s_inodes_per_block;      /* number of inodes per block */
 27         unsigned int   s_inodes_per_block_1;    /* inodes_per_block - 1 */
 28         unsigned int   s_inodes_per_block_bits; /* log2(inodes_per_block) */
 29         unsigned int   s_ind_per_block;         /* number of indirections per block */
 30         unsigned int   s_ind_per_block_bits;    /* log2(ind_per_block) */
 31         unsigned int   s_ind_per_block_2;       /* ind_per_block ^ 2 */
 32         unsigned int   s_toobig_block;          /* 10 + ipb + ipb^2 + ipb^3 */
 33         unsigned int   s_block_base;    /* physical block number of block 0 */
 34         unsigned short s_fic_size;      /* free inode cache size, NICINOD */
 35         unsigned short s_flc_size;      /* free block list chunk size, NICFREE */
 36         /* The superblock is kept in one or two disk buffers: */
 37         struct buffer_head *s_bh1;
 38         struct buffer_head *s_bh2;
 39         /* These are pointers into the disk buffer, to compensate for
 40            different superblock layout. */
 41         char *         s_sbd1;          /* entire superblock data, for part 1 */
 42         char *         s_sbd2;          /* entire superblock data, for part 2 */
 43         __fs16         *s_sb_fic_count; /* pointer to s_sbd->s_ninode */
 44         sysv_ino_t     *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */
 45         __fs16         *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */
 46         __fs16         *s_bcache_count; /* pointer to s_sbd->s_nfree */
 47         sysv_zone_t    *s_bcache;       /* pointer to s_sbd->s_free */
 48         __fs32         *s_free_blocks;  /* pointer to s_sbd->s_tfree */
 49         __fs32         *s_sb_time;      /* pointer to s_sbd->s_time */
 50         __fs32         *s_sb_state;     /* pointer to s_sbd->s_state, only FSTYPE_SYSV */
 51         /* We keep those superblock entities that don't change here;
 52            this saves us an indirection and perhaps a conversion. */
 53         u32            s_firstinodezone; /* index of first inode zone */
 54         u32            s_firstdatazone; /* same as s_sbd->s_isize */
 55         u32            s_ninodes;       /* total number of inodes */
 56         u32            s_ndatazones;    /* total number of data zones */
 57         u32            s_nzones;        /* same as s_sbd->s_fsize */
 58         u16            s_namelen;       /* max length of dir entry */
 59         int            s_forced_ro;
 60         struct mutex s_lock;
 61 };
 62 
 63 /*
 64  * SystemV/V7/Coherent FS inode data in memory
 65  */
 66 struct sysv_inode_info {
 67         __fs32          i_data[13];
 68         u32             i_dir_start_lookup;
 69         struct inode    vfs_inode;
 70 };
 71 
 72 
 73 static inline struct sysv_inode_info *SYSV_I(struct inode *inode)
 74 {
 75         return container_of(inode, struct sysv_inode_info, vfs_inode);
 76 }
 77 
 78 static inline struct sysv_sb_info *SYSV_SB(struct super_block *sb)
 79 {
 80         return sb->s_fs_info;
 81 }
 82 
 83 
 84 /* identify the FS in memory */
 85 enum {
 86         FSTYPE_NONE = 0,
 87         FSTYPE_XENIX,
 88         FSTYPE_SYSV4,
 89         FSTYPE_SYSV2,
 90         FSTYPE_COH,
 91         FSTYPE_V7,
 92         FSTYPE_AFS,
 93         FSTYPE_END,
 94 };
 95 
 96 #define SYSV_MAGIC_BASE         0x012FF7B3
 97 
 98 #define XENIX_SUPER_MAGIC       (SYSV_MAGIC_BASE+FSTYPE_XENIX)
 99 #define SYSV4_SUPER_MAGIC       (SYSV_MAGIC_BASE+FSTYPE_SYSV4)
100 #define SYSV2_SUPER_MAGIC       (SYSV_MAGIC_BASE+FSTYPE_SYSV2)
101 #define COH_SUPER_MAGIC         (SYSV_MAGIC_BASE+FSTYPE_COH)
102 
103 
104 /* Admissible values for i_nlink: 0.._LINK_MAX */
105 enum {
106         XENIX_LINK_MAX  =       126,    /* ?? */
107         SYSV_LINK_MAX   =       126,    /* 127? 251? */
108         V7_LINK_MAX     =       126,    /* ?? */
109         COH_LINK_MAX    =       10000,
110 };
111 
112 
113 static inline void dirty_sb(struct super_block *sb)
114 {
115         struct sysv_sb_info *sbi = SYSV_SB(sb);
116 
117         mark_buffer_dirty(sbi->s_bh1);
118         if (sbi->s_bh1 != sbi->s_bh2)
119                 mark_buffer_dirty(sbi->s_bh2);
120 }
121 
122 
123 /* ialloc.c */
124 extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned,
125                         struct buffer_head **);
126 extern struct inode * sysv_new_inode(const struct inode *, umode_t);
127 extern void sysv_free_inode(struct inode *);
128 extern unsigned long sysv_count_free_inodes(struct super_block *);
129 
130 /* balloc.c */
131 extern sysv_zone_t sysv_new_block(struct super_block *);
132 extern void sysv_free_block(struct super_block *, sysv_zone_t);
133 extern unsigned long sysv_count_free_blocks(struct super_block *);
134 
135 /* itree.c */
136 extern void sysv_truncate(struct inode *);
137 extern int sysv_prepare_chunk(struct page *page, loff_t pos, unsigned len);
138 
139 /* inode.c */
140 extern struct inode *sysv_iget(struct super_block *, unsigned int);
141 extern int sysv_write_inode(struct inode *, struct writeback_control *wbc);
142 extern int sysv_sync_inode(struct inode *);
143 extern void sysv_set_inode(struct inode *, dev_t);
144 extern int sysv_getattr(const struct path *, struct kstat *, u32, unsigned int);
145 extern int sysv_init_icache(void);
146 extern void sysv_destroy_icache(void);
147 
148 
149 /* dir.c */
150 extern struct sysv_dir_entry *sysv_find_entry(struct dentry *, struct page **);
151 extern int sysv_add_link(struct dentry *, struct inode *);
152 extern int sysv_delete_entry(struct sysv_dir_entry *, struct page *);
153 extern int sysv_make_empty(struct inode *, struct inode *);
154 extern int sysv_empty_dir(struct inode *);
155 extern void sysv_set_link(struct sysv_dir_entry *, struct page *,
156                         struct inode *);
157 extern struct sysv_dir_entry *sysv_dotdot(struct inode *, struct page **);
158 extern ino_t sysv_inode_by_name(struct dentry *);
159 
160 
161 extern const struct inode_operations sysv_file_inode_operations;
162 extern const struct inode_operations sysv_dir_inode_operations;
163 extern const struct file_operations sysv_file_operations;
164 extern const struct file_operations sysv_dir_operations;
165 extern const struct address_space_operations sysv_aops;
166 extern const struct super_operations sysv_sops;
167 
168 
169 enum {
170         BYTESEX_LE,
171         BYTESEX_PDP,
172         BYTESEX_BE,
173 };
174 
175 static inline u32 PDP_swab(u32 x)
176 {
177 #ifdef __LITTLE_ENDIAN
178         return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16);
179 #else
180 #ifdef __BIG_ENDIAN
181         return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8);
182 #else
183 #error BYTESEX
184 #endif
185 #endif
186 }
187 
188 static inline __u32 fs32_to_cpu(struct sysv_sb_info *sbi, __fs32 n)
189 {
190         if (sbi->s_bytesex == BYTESEX_PDP)
191                 return PDP_swab((__force __u32)n);
192         else if (sbi->s_bytesex == BYTESEX_LE)
193                 return le32_to_cpu((__force __le32)n);
194         else
195                 return be32_to_cpu((__force __be32)n);
196 }
197 
198 static inline __fs32 cpu_to_fs32(struct sysv_sb_info *sbi, __u32 n)
199 {
200         if (sbi->s_bytesex == BYTESEX_PDP)
201                 return (__force __fs32)PDP_swab(n);
202         else if (sbi->s_bytesex == BYTESEX_LE)
203                 return (__force __fs32)cpu_to_le32(n);
204         else
205                 return (__force __fs32)cpu_to_be32(n);
206 }
207 
208 static inline __fs32 fs32_add(struct sysv_sb_info *sbi, __fs32 *n, int d)
209 {
210         if (sbi->s_bytesex == BYTESEX_PDP)
211                 *(__u32*)n = PDP_swab(PDP_swab(*(__u32*)n)+d);
212         else if (sbi->s_bytesex == BYTESEX_LE)
213                 le32_add_cpu((__le32 *)n, d);
214         else
215                 be32_add_cpu((__be32 *)n, d);
216         return *n;
217 }
218 
219 static inline __u16 fs16_to_cpu(struct sysv_sb_info *sbi, __fs16 n)
220 {
221         if (sbi->s_bytesex != BYTESEX_BE)
222                 return le16_to_cpu((__force __le16)n);
223         else
224                 return be16_to_cpu((__force __be16)n);
225 }
226 
227 static inline __fs16 cpu_to_fs16(struct sysv_sb_info *sbi, __u16 n)
228 {
229         if (sbi->s_bytesex != BYTESEX_BE)
230                 return (__force __fs16)cpu_to_le16(n);
231         else
232                 return (__force __fs16)cpu_to_be16(n);
233 }
234 
235 static inline __fs16 fs16_add(struct sysv_sb_info *sbi, __fs16 *n, int d)
236 {
237         if (sbi->s_bytesex != BYTESEX_BE)
238                 le16_add_cpu((__le16 *)n, d);
239         else
240                 be16_add_cpu((__be16 *)n, d);
241         return *n;
242 }
243 
244 #endif /* _SYSV_H */
245 

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