~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

TOMOYO Linux Cross Reference
Linux/fs/sysv/sysv.h

Version: ~ [ linux-5.19-rc8 ] ~ [ linux-5.18.14 ] ~ [ linux-5.17.15 ] ~ [ linux-5.16.20 ] ~ [ linux-5.15.57 ] ~ [ linux-5.14.21 ] ~ [ linux-5.13.19 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.133 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.207 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.253 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.289 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.324 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.302 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.9 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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         char           s_truncate;      /* if 1: names > SYSV_NAMELEN chars are truncated */
 27                                         /* if 0: they are disallowed (ENAMETOOLONG) */
 28         unsigned int   s_inodes_per_block;      /* number of inodes per block */
 29         unsigned int   s_inodes_per_block_1;    /* inodes_per_block - 1 */
 30         unsigned int   s_inodes_per_block_bits; /* log2(inodes_per_block) */
 31         unsigned int   s_ind_per_block;         /* number of indirections per block */
 32         unsigned int   s_ind_per_block_bits;    /* log2(ind_per_block) */
 33         unsigned int   s_ind_per_block_2;       /* ind_per_block ^ 2 */
 34         unsigned int   s_toobig_block;          /* 10 + ipb + ipb^2 + ipb^3 */
 35         unsigned int   s_block_base;    /* physical block number of block 0 */
 36         unsigned short s_fic_size;      /* free inode cache size, NICINOD */
 37         unsigned short s_flc_size;      /* free block list chunk size, NICFREE */
 38         /* The superblock is kept in one or two disk buffers: */
 39         struct buffer_head *s_bh1;
 40         struct buffer_head *s_bh2;
 41         /* These are pointers into the disk buffer, to compensate for
 42            different superblock layout. */
 43         char *         s_sbd1;          /* entire superblock data, for part 1 */
 44         char *         s_sbd2;          /* entire superblock data, for part 2 */
 45         __fs16         *s_sb_fic_count; /* pointer to s_sbd->s_ninode */
 46         sysv_ino_t     *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */
 47         __fs16         *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */
 48         __fs16         *s_bcache_count; /* pointer to s_sbd->s_nfree */
 49         sysv_zone_t    *s_bcache;       /* pointer to s_sbd->s_free */
 50         __fs32         *s_free_blocks;  /* pointer to s_sbd->s_tfree */
 51         __fs32         *s_sb_time;      /* pointer to s_sbd->s_time */
 52         __fs32         *s_sb_state;     /* pointer to s_sbd->s_state, only FSTYPE_SYSV */
 53         /* We keep those superblock entities that don't change here;
 54            this saves us an indirection and perhaps a conversion. */
 55         u32            s_firstinodezone; /* index of first inode zone */
 56         u32            s_firstdatazone; /* same as s_sbd->s_isize */
 57         u32            s_ninodes;       /* total number of inodes */
 58         u32            s_ndatazones;    /* total number of data zones */
 59         u32            s_nzones;        /* same as s_sbd->s_fsize */
 60         u16            s_namelen;       /* max length of dir entry */
 61         int            s_forced_ro;
 62         struct mutex s_lock;
 63 };
 64 
 65 /*
 66  * SystemV/V7/Coherent FS inode data in memory
 67  */
 68 struct sysv_inode_info {
 69         __fs32          i_data[13];
 70         u32             i_dir_start_lookup;
 71         struct inode    vfs_inode;
 72 };
 73 
 74 
 75 static inline struct sysv_inode_info *SYSV_I(struct inode *inode)
 76 {
 77         return container_of(inode, struct sysv_inode_info, vfs_inode);
 78 }
 79 
 80 static inline struct sysv_sb_info *SYSV_SB(struct super_block *sb)
 81 {
 82         return sb->s_fs_info;
 83 }
 84 
 85 
 86 /* identify the FS in memory */
 87 enum {
 88         FSTYPE_NONE = 0,
 89         FSTYPE_XENIX,
 90         FSTYPE_SYSV4,
 91         FSTYPE_SYSV2,
 92         FSTYPE_COH,
 93         FSTYPE_V7,
 94         FSTYPE_AFS,
 95         FSTYPE_END,
 96 };
 97 
 98 #define SYSV_MAGIC_BASE         0x012FF7B3
 99 
100 #define XENIX_SUPER_MAGIC       (SYSV_MAGIC_BASE+FSTYPE_XENIX)
101 #define SYSV4_SUPER_MAGIC       (SYSV_MAGIC_BASE+FSTYPE_SYSV4)
102 #define SYSV2_SUPER_MAGIC       (SYSV_MAGIC_BASE+FSTYPE_SYSV2)
103 #define COH_SUPER_MAGIC         (SYSV_MAGIC_BASE+FSTYPE_COH)
104 
105 
106 /* Admissible values for i_nlink: 0.._LINK_MAX */
107 enum {
108         XENIX_LINK_MAX  =       126,    /* ?? */
109         SYSV_LINK_MAX   =       126,    /* 127? 251? */
110         V7_LINK_MAX     =       126,    /* ?? */
111         COH_LINK_MAX    =       10000,
112 };
113 
114 
115 static inline void dirty_sb(struct super_block *sb)
116 {
117         struct sysv_sb_info *sbi = SYSV_SB(sb);
118 
119         mark_buffer_dirty(sbi->s_bh1);
120         if (sbi->s_bh1 != sbi->s_bh2)
121                 mark_buffer_dirty(sbi->s_bh2);
122 }
123 
124 
125 /* ialloc.c */
126 extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned,
127                         struct buffer_head **);
128 extern struct inode * sysv_new_inode(const struct inode *, umode_t);
129 extern void sysv_free_inode(struct inode *);
130 extern unsigned long sysv_count_free_inodes(struct super_block *);
131 
132 /* balloc.c */
133 extern sysv_zone_t sysv_new_block(struct super_block *);
134 extern void sysv_free_block(struct super_block *, sysv_zone_t);
135 extern unsigned long sysv_count_free_blocks(struct super_block *);
136 
137 /* itree.c */
138 extern void sysv_truncate(struct inode *);
139 extern int sysv_prepare_chunk(struct page *page, loff_t pos, unsigned len);
140 
141 /* inode.c */
142 extern struct inode *sysv_iget(struct super_block *, unsigned int);
143 extern int sysv_write_inode(struct inode *, struct writeback_control *wbc);
144 extern int sysv_sync_inode(struct inode *);
145 extern void sysv_set_inode(struct inode *, dev_t);
146 extern int sysv_getattr(const struct path *, struct kstat *, u32, unsigned int);
147 extern int sysv_init_icache(void);
148 extern void sysv_destroy_icache(void);
149 
150 
151 /* dir.c */
152 extern struct sysv_dir_entry *sysv_find_entry(struct dentry *, struct page **);
153 extern int sysv_add_link(struct dentry *, struct inode *);
154 extern int sysv_delete_entry(struct sysv_dir_entry *, struct page *);
155 extern int sysv_make_empty(struct inode *, struct inode *);
156 extern int sysv_empty_dir(struct inode *);
157 extern void sysv_set_link(struct sysv_dir_entry *, struct page *,
158                         struct inode *);
159 extern struct sysv_dir_entry *sysv_dotdot(struct inode *, struct page **);
160 extern ino_t sysv_inode_by_name(struct dentry *);
161 
162 
163 extern const struct inode_operations sysv_file_inode_operations;
164 extern const struct inode_operations sysv_dir_inode_operations;
165 extern const struct file_operations sysv_file_operations;
166 extern const struct file_operations sysv_dir_operations;
167 extern const struct address_space_operations sysv_aops;
168 extern const struct super_operations sysv_sops;
169 extern const struct dentry_operations sysv_dentry_operations;
170 
171 
172 enum {
173         BYTESEX_LE,
174         BYTESEX_PDP,
175         BYTESEX_BE,
176 };
177 
178 static inline u32 PDP_swab(u32 x)
179 {
180 #ifdef __LITTLE_ENDIAN
181         return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16);
182 #else
183 #ifdef __BIG_ENDIAN
184         return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8);
185 #else
186 #error BYTESEX
187 #endif
188 #endif
189 }
190 
191 static inline __u32 fs32_to_cpu(struct sysv_sb_info *sbi, __fs32 n)
192 {
193         if (sbi->s_bytesex == BYTESEX_PDP)
194                 return PDP_swab((__force __u32)n);
195         else if (sbi->s_bytesex == BYTESEX_LE)
196                 return le32_to_cpu((__force __le32)n);
197         else
198                 return be32_to_cpu((__force __be32)n);
199 }
200 
201 static inline __fs32 cpu_to_fs32(struct sysv_sb_info *sbi, __u32 n)
202 {
203         if (sbi->s_bytesex == BYTESEX_PDP)
204                 return (__force __fs32)PDP_swab(n);
205         else if (sbi->s_bytesex == BYTESEX_LE)
206                 return (__force __fs32)cpu_to_le32(n);
207         else
208                 return (__force __fs32)cpu_to_be32(n);
209 }
210 
211 static inline __fs32 fs32_add(struct sysv_sb_info *sbi, __fs32 *n, int d)
212 {
213         if (sbi->s_bytesex == BYTESEX_PDP)
214                 *(__u32*)n = PDP_swab(PDP_swab(*(__u32*)n)+d);
215         else if (sbi->s_bytesex == BYTESEX_LE)
216                 le32_add_cpu((__le32 *)n, d);
217         else
218                 be32_add_cpu((__be32 *)n, d);
219         return *n;
220 }
221 
222 static inline __u16 fs16_to_cpu(struct sysv_sb_info *sbi, __fs16 n)
223 {
224         if (sbi->s_bytesex != BYTESEX_BE)
225                 return le16_to_cpu((__force __le16)n);
226         else
227                 return be16_to_cpu((__force __be16)n);
228 }
229 
230 static inline __fs16 cpu_to_fs16(struct sysv_sb_info *sbi, __u16 n)
231 {
232         if (sbi->s_bytesex != BYTESEX_BE)
233                 return (__force __fs16)cpu_to_le16(n);
234         else
235                 return (__force __fs16)cpu_to_be16(n);
236 }
237 
238 static inline __fs16 fs16_add(struct sysv_sb_info *sbi, __fs16 *n, int d)
239 {
240         if (sbi->s_bytesex != BYTESEX_BE)
241                 le16_add_cpu((__le16 *)n, d);
242         else
243                 be16_add_cpu((__be16 *)n, d);
244         return *n;
245 }
246 
247 #endif /* _SYSV_H */
248 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp