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

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

Version: ~ [ linux-5.4-rc3 ] ~ [ linux-5.3.6 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.79 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.149 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.196 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.196 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.19.8 ] ~ [ linux-3.18.140 ] ~ [ linux-3.17.8 ] ~ [ linux-3.16.75 ] ~ [ linux-3.15.10 ] ~ [ linux-3.14.79 ] ~ [ linux-3.13.11 ] ~ [ linux-3.12.74 ] ~ [ linux-3.11.10 ] ~ [ linux-3.10.108 ] ~ [ linux-3.9.11 ] ~ [ linux-3.8.13 ] ~ [ linux-3.7.10 ] ~ [ linux-3.6.11 ] ~ [ linux-3.5.7 ] ~ [ linux-3.4.113 ] ~ [ linux-3.3.8 ] ~ [ linux-3.2.102 ] ~ [ linux-3.1.10 ] ~ [ linux-3.0.101 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  1 #ifndef _SYSV_H
  2 #define _SYSV_H
  3 
  4 #include <linux/buffer_head.h>
  5 
  6 typedef __u16 __bitwise __fs16;
  7 typedef __u32 __bitwise __fs32;
  8 
  9 #include <linux/sysv_fs.h>
 10 
 11 /*
 12  * SystemV/V7/Coherent super-block data in memory
 13  *
 14  * The SystemV/V7/Coherent superblock contains dynamic data (it gets modified
 15  * while the system is running). This is in contrast to the Minix and Berkeley
 16  * filesystems (where the superblock is never modified). This affects the
 17  * sync() operation: we must keep the superblock in a disk buffer and use this
 18  * one as our "working copy".
 19  */
 20 
 21 struct sysv_sb_info {
 22         struct super_block *s_sb;       /* VFS superblock */
 23         int            s_type;          /* file system type: FSTYPE_{XENIX|SYSV|COH} */
 24         char           s_bytesex;       /* bytesex (le/be/pdp) */
 25         char           s_truncate;      /* if 1: names > SYSV_NAMELEN chars are truncated */
 26                                         /* if 0: they are disallowed (ENAMETOOLONG) */
 27         unsigned int   s_inodes_per_block;      /* number of inodes per block */
 28         unsigned int   s_inodes_per_block_1;    /* inodes_per_block - 1 */
 29         unsigned int   s_inodes_per_block_bits; /* log2(inodes_per_block) */
 30         unsigned int   s_ind_per_block;         /* number of indirections per block */
 31         unsigned int   s_ind_per_block_bits;    /* log2(ind_per_block) */
 32         unsigned int   s_ind_per_block_2;       /* ind_per_block ^ 2 */
 33         unsigned int   s_toobig_block;          /* 10 + ipb + ipb^2 + ipb^3 */
 34         unsigned int   s_block_base;    /* physical block number of block 0 */
 35         unsigned short s_fic_size;      /* free inode cache size, NICINOD */
 36         unsigned short s_flc_size;      /* free block list chunk size, NICFREE */
 37         /* The superblock is kept in one or two disk buffers: */
 38         struct buffer_head *s_bh1;
 39         struct buffer_head *s_bh2;
 40         /* These are pointers into the disk buffer, to compensate for
 41            different superblock layout. */
 42         char *         s_sbd1;          /* entire superblock data, for part 1 */
 43         char *         s_sbd2;          /* entire superblock data, for part 2 */
 44         __fs16         *s_sb_fic_count; /* pointer to s_sbd->s_ninode */
 45         sysv_ino_t     *s_sb_fic_inodes; /* pointer to s_sbd->s_inode */
 46         __fs16         *s_sb_total_free_inodes; /* pointer to s_sbd->s_tinode */
 47         __fs16         *s_bcache_count; /* pointer to s_sbd->s_nfree */
 48         sysv_zone_t    *s_bcache;       /* pointer to s_sbd->s_free */
 49         __fs32         *s_free_blocks;  /* pointer to s_sbd->s_tfree */
 50         __fs32         *s_sb_time;      /* pointer to s_sbd->s_time */
 51         __fs32         *s_sb_state;     /* pointer to s_sbd->s_state, only FSTYPE_SYSV */
 52         /* We keep those superblock entities that don't change here;
 53            this saves us an indirection and perhaps a conversion. */
 54         u32            s_firstinodezone; /* index of first inode zone */
 55         u32            s_firstdatazone; /* same as s_sbd->s_isize */
 56         u32            s_ninodes;       /* total number of inodes */
 57         u32            s_ndatazones;    /* total number of data zones */
 58         u32            s_nzones;        /* same as s_sbd->s_fsize */
 59         u16            s_namelen;       /* max length of dir entry */
 60         int            s_forced_ro;
 61         struct mutex s_lock;
 62 };
 63 
 64 /*
 65  * SystemV/V7/Coherent FS inode data in memory
 66  */
 67 struct sysv_inode_info {
 68         __fs32          i_data[13];
 69         u32             i_dir_start_lookup;
 70         struct inode    vfs_inode;
 71 };
 72 
 73 
 74 static inline struct sysv_inode_info *SYSV_I(struct inode *inode)
 75 {
 76         return container_of(inode, struct sysv_inode_info, vfs_inode);
 77 }
 78 
 79 static inline struct sysv_sb_info *SYSV_SB(struct super_block *sb)
 80 {
 81         return sb->s_fs_info;
 82 }
 83 
 84 
 85 /* identify the FS in memory */
 86 enum {
 87         FSTYPE_NONE = 0,
 88         FSTYPE_XENIX,
 89         FSTYPE_SYSV4,
 90         FSTYPE_SYSV2,
 91         FSTYPE_COH,
 92         FSTYPE_V7,
 93         FSTYPE_AFS,
 94         FSTYPE_END,
 95 };
 96 
 97 #define SYSV_MAGIC_BASE         0x012FF7B3
 98 
 99 #define XENIX_SUPER_MAGIC       (SYSV_MAGIC_BASE+FSTYPE_XENIX)
100 #define SYSV4_SUPER_MAGIC       (SYSV_MAGIC_BASE+FSTYPE_SYSV4)
101 #define SYSV2_SUPER_MAGIC       (SYSV_MAGIC_BASE+FSTYPE_SYSV2)
102 #define COH_SUPER_MAGIC         (SYSV_MAGIC_BASE+FSTYPE_COH)
103 
104 
105 /* Admissible values for i_nlink: 0.._LINK_MAX */
106 enum {
107         XENIX_LINK_MAX  =       126,    /* ?? */
108         SYSV_LINK_MAX   =       126,    /* 127? 251? */
109         V7_LINK_MAX     =       126,    /* ?? */
110         COH_LINK_MAX    =       10000,
111 };
112 
113 
114 static inline void dirty_sb(struct super_block *sb)
115 {
116         struct sysv_sb_info *sbi = SYSV_SB(sb);
117 
118         mark_buffer_dirty(sbi->s_bh1);
119         if (sbi->s_bh1 != sbi->s_bh2)
120                 mark_buffer_dirty(sbi->s_bh2);
121 }
122 
123 
124 /* ialloc.c */
125 extern struct sysv_inode *sysv_raw_inode(struct super_block *, unsigned,
126                         struct buffer_head **);
127 extern struct inode * sysv_new_inode(const struct inode *, umode_t);
128 extern void sysv_free_inode(struct inode *);
129 extern unsigned long sysv_count_free_inodes(struct super_block *);
130 
131 /* balloc.c */
132 extern sysv_zone_t sysv_new_block(struct super_block *);
133 extern void sysv_free_block(struct super_block *, sysv_zone_t);
134 extern unsigned long sysv_count_free_blocks(struct super_block *);
135 
136 /* itree.c */
137 extern void sysv_truncate(struct inode *);
138 extern int sysv_prepare_chunk(struct page *page, loff_t pos, unsigned len);
139 
140 /* inode.c */
141 extern struct inode *sysv_iget(struct super_block *, unsigned int);
142 extern int sysv_write_inode(struct inode *, struct writeback_control *wbc);
143 extern int sysv_sync_inode(struct inode *);
144 extern void sysv_set_inode(struct inode *, dev_t);
145 extern int sysv_getattr(struct vfsmount *, struct dentry *, struct kstat *);
146 extern int sysv_init_icache(void);
147 extern void sysv_destroy_icache(void);
148 
149 
150 /* dir.c */
151 extern struct sysv_dir_entry *sysv_find_entry(struct dentry *, struct page **);
152 extern int sysv_add_link(struct dentry *, struct inode *);
153 extern int sysv_delete_entry(struct sysv_dir_entry *, struct page *);
154 extern int sysv_make_empty(struct inode *, struct inode *);
155 extern int sysv_empty_dir(struct inode *);
156 extern void sysv_set_link(struct sysv_dir_entry *, struct page *,
157                         struct inode *);
158 extern struct sysv_dir_entry *sysv_dotdot(struct inode *, struct page **);
159 extern ino_t sysv_inode_by_name(struct dentry *);
160 
161 
162 extern const struct inode_operations sysv_file_inode_operations;
163 extern const struct inode_operations sysv_dir_inode_operations;
164 extern const struct file_operations sysv_file_operations;
165 extern const struct file_operations sysv_dir_operations;
166 extern const struct address_space_operations sysv_aops;
167 extern const struct super_operations sysv_sops;
168 extern const struct dentry_operations sysv_dentry_operations;
169 
170 
171 enum {
172         BYTESEX_LE,
173         BYTESEX_PDP,
174         BYTESEX_BE,
175 };
176 
177 static inline u32 PDP_swab(u32 x)
178 {
179 #ifdef __LITTLE_ENDIAN
180         return ((x & 0xffff) << 16) | ((x & 0xffff0000) >> 16);
181 #else
182 #ifdef __BIG_ENDIAN
183         return ((x & 0xff00ff) << 8) | ((x & 0xff00ff00) >> 8);
184 #else
185 #error BYTESEX
186 #endif
187 #endif
188 }
189 
190 static inline __u32 fs32_to_cpu(struct sysv_sb_info *sbi, __fs32 n)
191 {
192         if (sbi->s_bytesex == BYTESEX_PDP)
193                 return PDP_swab((__force __u32)n);
194         else if (sbi->s_bytesex == BYTESEX_LE)
195                 return le32_to_cpu((__force __le32)n);
196         else
197                 return be32_to_cpu((__force __be32)n);
198 }
199 
200 static inline __fs32 cpu_to_fs32(struct sysv_sb_info *sbi, __u32 n)
201 {
202         if (sbi->s_bytesex == BYTESEX_PDP)
203                 return (__force __fs32)PDP_swab(n);
204         else if (sbi->s_bytesex == BYTESEX_LE)
205                 return (__force __fs32)cpu_to_le32(n);
206         else
207                 return (__force __fs32)cpu_to_be32(n);
208 }
209 
210 static inline __fs32 fs32_add(struct sysv_sb_info *sbi, __fs32 *n, int d)
211 {
212         if (sbi->s_bytesex == BYTESEX_PDP)
213                 *(__u32*)n = PDP_swab(PDP_swab(*(__u32*)n)+d);
214         else if (sbi->s_bytesex == BYTESEX_LE)
215                 le32_add_cpu((__le32 *)n, d);
216         else
217                 be32_add_cpu((__be32 *)n, d);
218         return *n;
219 }
220 
221 static inline __u16 fs16_to_cpu(struct sysv_sb_info *sbi, __fs16 n)
222 {
223         if (sbi->s_bytesex != BYTESEX_BE)
224                 return le16_to_cpu((__force __le16)n);
225         else
226                 return be16_to_cpu((__force __be16)n);
227 }
228 
229 static inline __fs16 cpu_to_fs16(struct sysv_sb_info *sbi, __u16 n)
230 {
231         if (sbi->s_bytesex != BYTESEX_BE)
232                 return (__force __fs16)cpu_to_le16(n);
233         else
234                 return (__force __fs16)cpu_to_be16(n);
235 }
236 
237 static inline __fs16 fs16_add(struct sysv_sb_info *sbi, __fs16 *n, int d)
238 {
239         if (sbi->s_bytesex != BYTESEX_BE)
240                 le16_add_cpu((__le16 *)n, d);
241         else
242                 be16_add_cpu((__be16 *)n, d);
243         return *n;
244 }
245 
246 #endif /* _SYSV_H */
247 

~ [ 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