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Linux/fs/freevxfs/vxfs.h

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  1 /*
  2  * Copyright (c) 2000-2001 Christoph Hellwig.
  3  * Copyright (c) 2016 Krzysztof Blaszkowski
  4  * All rights reserved.
  5  *
  6  * Redistribution and use in source and binary forms, with or without
  7  * modification, are permitted provided that the following conditions
  8  * are met:
  9  * 1. Redistributions of source code must retain the above copyright
 10  *    notice, this list of conditions, and the following disclaimer,
 11  *    without modification.
 12  * 2. The name of the author may not be used to endorse or promote products
 13  *    derived from this software without specific prior written permission.
 14  *
 15  * Alternatively, this software may be distributed under the terms of the
 16  * GNU General Public License ("GPL").
 17  *
 18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
 19  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 20  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 21  * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
 22  * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 23  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 24  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 25  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
 26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
 27  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
 28  * SUCH DAMAGE.
 29  *
 30  */
 31 #ifndef _VXFS_SUPER_H_
 32 #define _VXFS_SUPER_H_
 33 
 34 /*
 35  * Veritas filesystem driver - superblock structure.
 36  *
 37  * This file contains the definition of the disk and core
 38  * superblocks of the Veritas Filesystem.
 39  */
 40 #include <linux/types.h>
 41 
 42 /*
 43  * Superblock magic number (vxfs_super->vs_magic).
 44  */
 45 #define VXFS_SUPER_MAGIC        0xa501FCF5
 46 
 47 /*
 48  * The root inode.
 49  */
 50 #define VXFS_ROOT_INO           2
 51 
 52 /*
 53  * Num of entries in free extent array
 54  */
 55 #define VXFS_NEFREE             32
 56 
 57 enum vxfs_byte_order {
 58         VXFS_BO_LE,
 59         VXFS_BO_BE,
 60 };
 61 
 62 typedef __u16 __bitwise __fs16;
 63 typedef __u32 __bitwise __fs32;
 64 typedef __u64 __bitwise __fs64;
 65 
 66 /*
 67  * VxFS superblock (disk).
 68  */
 69 struct vxfs_sb {
 70         /*
 71          * Readonly fields for the version 1 superblock.
 72          *
 73          * Lots of this fields are no more used by version 2
 74          * and never filesystems.
 75          */
 76         __fs32          vs_magic;               /* Magic number */
 77         __fs32          vs_version;             /* VxFS version */
 78         __fs32          vs_ctime;               /* create time - secs */
 79         __fs32          vs_cutime;              /* create time - usecs */
 80         __fs32          __unused1;              /* unused */
 81         __fs32          __unused2;              /* unused */
 82         __fs32          vs_old_logstart;        /* obsolete */
 83         __fs32          vs_old_logend;          /* obsolete */
 84         __fs32          vs_bsize;               /* block size */
 85         __fs32          vs_size;                /* number of blocks */
 86         __fs32          vs_dsize;               /* number of data blocks */
 87         __fs32          vs_old_ninode;          /* obsolete */
 88         __fs32          vs_old_nau;             /* obsolete */
 89         __fs32          __unused3;              /* unused */
 90         __fs32          vs_old_defiextsize;     /* obsolete */
 91         __fs32          vs_old_ilbsize;         /* obsolete */
 92         __fs32          vs_immedlen;            /* size of immediate data area */
 93         __fs32          vs_ndaddr;              /* number of direct extentes */
 94         __fs32          vs_firstau;             /* address of first AU */
 95         __fs32          vs_emap;                /* offset of extent map in AU */
 96         __fs32          vs_imap;                /* offset of inode map in AU */
 97         __fs32          vs_iextop;              /* offset of ExtOp. map in AU */
 98         __fs32          vs_istart;              /* offset of inode list in AU */
 99         __fs32          vs_bstart;              /* offset of fdblock in AU */
100         __fs32          vs_femap;               /* aufirst + emap */
101         __fs32          vs_fimap;               /* aufirst + imap */
102         __fs32          vs_fiextop;             /* aufirst + iextop */
103         __fs32          vs_fistart;             /* aufirst + istart */
104         __fs32          vs_fbstart;             /* aufirst + bstart */
105         __fs32          vs_nindir;              /* number of entries in indir */
106         __fs32          vs_aulen;               /* length of AU in blocks */
107         __fs32          vs_auimlen;             /* length of imap in blocks */
108         __fs32          vs_auemlen;             /* length of emap in blocks */
109         __fs32          vs_auilen;              /* length of ilist in blocks */
110         __fs32          vs_aupad;               /* length of pad in blocks */
111         __fs32          vs_aublocks;            /* data blocks in AU */
112         __fs32          vs_maxtier;             /* log base 2 of aublocks */
113         __fs32          vs_inopb;               /* number of inodes per blk */
114         __fs32          vs_old_inopau;          /* obsolete */
115         __fs32          vs_old_inopilb;         /* obsolete */
116         __fs32          vs_old_ndiripau;        /* obsolete */
117         __fs32          vs_iaddrlen;            /* size of indirect addr ext. */
118         __fs32          vs_bshift;              /* log base 2 of bsize */
119         __fs32          vs_inoshift;            /* log base 2 of inobp */
120         __fs32          vs_bmask;               /* ~( bsize - 1 ) */
121         __fs32          vs_boffmask;            /* bsize - 1 */
122         __fs32          vs_old_inomask;         /* old_inopilb - 1 */
123         __fs32          vs_checksum;            /* checksum of V1 data */
124         
125         /*
126          * Version 1, writable
127          */
128         __fs32          vs_free;                /* number of free blocks */
129         __fs32          vs_ifree;               /* number of free inodes */
130         __fs32          vs_efree[VXFS_NEFREE];  /* number of free extents by size */
131         __fs32          vs_flags;               /* flags ?!? */
132         __u8            vs_mod;                 /* filesystem has been changed */
133         __u8            vs_clean;               /* clean FS */
134         __fs16          __unused4;              /* unused */
135         __fs32          vs_firstlogid;          /* mount time log ID */
136         __fs32          vs_wtime;               /* last time written - sec */
137         __fs32          vs_wutime;              /* last time written - usec */
138         __u8            vs_fname[6];            /* FS name */
139         __u8            vs_fpack[6];            /* FS pack name */
140         __fs32          vs_logversion;          /* log format version */
141         __u32           __unused5;              /* unused */
142         
143         /*
144          * Version 2, Read-only
145          */
146         __fs32          vs_oltext[2];           /* OLT extent and replica */
147         __fs32          vs_oltsize;             /* OLT extent size */
148         __fs32          vs_iauimlen;            /* size of inode map */
149         __fs32          vs_iausize;             /* size of IAU in blocks */
150         __fs32          vs_dinosize;            /* size of inode in bytes */
151         __fs32          vs_old_dniaddr;         /* indir levels per inode */
152         __fs32          vs_checksum2;           /* checksum of V2 RO */
153 
154         /*
155          * Actually much more...
156          */
157 };
158 
159 
160 /*
161  * In core superblock filesystem private data for VxFS.
162  */
163 struct vxfs_sb_info {
164         struct vxfs_sb          *vsi_raw;       /* raw (on disk) superblock */
165         struct buffer_head      *vsi_bp;        /* buffer for raw superblock*/
166         struct inode            *vsi_fship;     /* fileset header inode */
167         struct inode            *vsi_ilist;     /* inode list inode */
168         struct inode            *vsi_stilist;   /* structural inode list inode */
169         u_long                  vsi_iext;       /* initial inode list */
170         ino_t                   vsi_fshino;     /* fileset header inode */
171         daddr_t                 vsi_oltext;     /* OLT extent */
172         daddr_t                 vsi_oltsize;    /* OLT size */
173         enum vxfs_byte_order    byte_order;
174 };
175 
176 static inline u16 fs16_to_cpu(struct vxfs_sb_info *sbi, __fs16 a)
177 {
178         if (sbi->byte_order == VXFS_BO_BE)
179                 return be16_to_cpu((__force __be16)a);
180         else
181                 return le16_to_cpu((__force __le16)a);
182 }
183 
184 static inline u32 fs32_to_cpu(struct vxfs_sb_info *sbi, __fs32 a)
185 {
186         if (sbi->byte_order == VXFS_BO_BE)
187                 return be32_to_cpu((__force __be32)a);
188         else
189                 return le32_to_cpu((__force __le32)a);
190 }
191 
192 static inline u64 fs64_to_cpu(struct vxfs_sb_info *sbi, __fs64 a)
193 {
194         if (sbi->byte_order == VXFS_BO_BE)
195                 return be64_to_cpu((__force __be64)a);
196         else
197                 return le64_to_cpu((__force __le64)a);
198 }
199 
200 /*
201  * File modes.  File types above 0xf000 are vxfs internal only, they should
202  * not be passed back to higher levels of the system.  vxfs file types must
203  * never have one of the regular file type bits set.
204  */
205 enum vxfs_mode {
206         VXFS_ISUID = 0x00000800,        /* setuid */
207         VXFS_ISGID = 0x00000400,        /* setgid */
208         VXFS_ISVTX = 0x00000200,        /* sticky bit */
209         VXFS_IREAD = 0x00000100,        /* read */
210         VXFS_IWRITE = 0x00000080,       /* write */
211         VXFS_IEXEC = 0x00000040,        /* exec */
212 
213         VXFS_IFIFO = 0x00001000,        /* Named pipe */
214         VXFS_IFCHR = 0x00002000,        /* Character device */
215         VXFS_IFDIR = 0x00004000,        /* Directory */
216         VXFS_IFNAM = 0x00005000,        /* Xenix device ?? */
217         VXFS_IFBLK = 0x00006000,        /* Block device */
218         VXFS_IFREG = 0x00008000,        /* Regular file */
219         VXFS_IFCMP = 0x00009000,        /* Compressed file ?!? */
220         VXFS_IFLNK = 0x0000a000,        /* Symlink */
221         VXFS_IFSOC = 0x0000c000,        /* Socket */
222 
223         /* VxFS internal */
224         VXFS_IFFSH = 0x10000000,        /* Fileset header */
225         VXFS_IFILT = 0x20000000,        /* Inode list */
226         VXFS_IFIAU = 0x30000000,        /* Inode allocation unit */
227         VXFS_IFCUT = 0x40000000,        /* Current usage table */
228         VXFS_IFATT = 0x50000000,        /* Attr. inode */
229         VXFS_IFLCT = 0x60000000,        /* Link count table */
230         VXFS_IFIAT = 0x70000000,        /* Indirect attribute file */
231         VXFS_IFEMR = 0x80000000,        /* Extent map reorg file */
232         VXFS_IFQUO = 0x90000000,        /* BSD quota file */
233         VXFS_IFPTI = 0xa0000000,        /* "Pass through" inode */
234         VXFS_IFLAB = 0x11000000,        /* Device label file */
235         VXFS_IFOLT = 0x12000000,        /* OLT file */
236         VXFS_IFLOG = 0x13000000,        /* Log file */
237         VXFS_IFEMP = 0x14000000,        /* Extent map file */
238         VXFS_IFEAU = 0x15000000,        /* Extent AU file */
239         VXFS_IFAUS = 0x16000000,        /* Extent AU summary file */
240         VXFS_IFDEV = 0x17000000,        /* Device config file */
241 
242 };
243 
244 #define VXFS_TYPE_MASK          0xfffff000
245 
246 #define VXFS_IS_TYPE(ip,type)   (((ip)->vii_mode & VXFS_TYPE_MASK) == (type))
247 #define VXFS_ISFIFO(x)          VXFS_IS_TYPE((x),VXFS_IFIFO)
248 #define VXFS_ISCHR(x)           VXFS_IS_TYPE((x),VXFS_IFCHR)
249 #define VXFS_ISDIR(x)           VXFS_IS_TYPE((x),VXFS_IFDIR)
250 #define VXFS_ISNAM(x)           VXFS_IS_TYPE((x),VXFS_IFNAM)
251 #define VXFS_ISBLK(x)           VXFS_IS_TYPE((x),VXFS_IFBLK)
252 #define VXFS_ISLNK(x)           VXFS_IS_TYPE((x),VXFS_IFLNK)
253 #define VXFS_ISREG(x)           VXFS_IS_TYPE((x),VXFS_IFREG)
254 #define VXFS_ISCMP(x)           VXFS_IS_TYPE((x),VXFS_IFCMP)
255 #define VXFS_ISSOC(x)           VXFS_IS_TYPE((x),VXFS_IFSOC)
256 
257 #define VXFS_ISFSH(x)           VXFS_IS_TYPE((x),VXFS_IFFSH)
258 #define VXFS_ISILT(x)           VXFS_IS_TYPE((x),VXFS_IFILT)
259 
260 /*
261  * Inmode organisation types.
262  */
263 enum {
264         VXFS_ORG_NONE   = 0,    /* Inode has *no* format ?!? */
265         VXFS_ORG_EXT4   = 1,    /* Ext4 */
266         VXFS_ORG_IMMED  = 2,    /* All data stored in inode */
267         VXFS_ORG_TYPED  = 3,    /* Typed extents */
268 };
269 
270 #define VXFS_IS_ORG(ip,org)     ((ip)->vii_orgtype == (org))
271 #define VXFS_ISNONE(ip)         VXFS_IS_ORG((ip), VXFS_ORG_NONE)
272 #define VXFS_ISEXT4(ip)         VXFS_IS_ORG((ip), VXFS_ORG_EXT4)
273 #define VXFS_ISIMMED(ip)        VXFS_IS_ORG((ip), VXFS_ORG_IMMED)
274 #define VXFS_ISTYPED(ip)        VXFS_IS_ORG((ip), VXFS_ORG_TYPED)
275 
276 /*
277  * Get filesystem private data from VFS superblock.
278  */
279 #define VXFS_SBI(sbp) \
280         ((struct vxfs_sb_info *)(sbp)->s_fs_info)
281 
282 #endif /* _VXFS_SUPER_H_ */
283 

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