Root/fs/coda/coda_linux.c

1/*
2 * Inode operations for Coda filesystem
3 * Original version: (C) 1996 P. Braam and M. Callahan
4 * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
5 *
6 * Carnegie Mellon encourages users to contribute improvements to
7 * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
8 */
9
10#include <linux/types.h>
11#include <linux/kernel.h>
12#include <linux/time.h>
13#include <linux/fs.h>
14#include <linux/stat.h>
15#include <linux/errno.h>
16#include <asm/uaccess.h>
17#include <linux/string.h>
18
19#include <linux/coda.h>
20#include <linux/coda_psdev.h>
21#include "coda_linux.h"
22
23/* initialize the debugging variables */
24int coda_fake_statfs;
25
26/* print a fid */
27char * coda_f2s(struct CodaFid *f)
28{
29    static char s[60];
30
31     sprintf(s, "(%08x.%08x.%08x.%08x)", f->opaque[0], f->opaque[1], f->opaque[2], f->opaque[3]);
32
33    return s;
34}
35
36/* recognize special .CONTROL name */
37int coda_iscontrol(const char *name, size_t length)
38{
39    return ((CODA_CONTROLLEN == length) &&
40                (strncmp(name, CODA_CONTROL, CODA_CONTROLLEN) == 0));
41}
42
43/* recognize /coda inode */
44int coda_isroot(struct inode *i)
45{
46    return ( i->i_sb->s_root->d_inode == i );
47}
48
49unsigned short coda_flags_to_cflags(unsigned short flags)
50{
51    unsigned short coda_flags = 0;
52    
53    if ((flags & O_ACCMODE) == O_RDONLY)
54        coda_flags |= C_O_READ;
55
56    if ((flags & O_ACCMODE) == O_RDWR)
57        coda_flags |= C_O_READ | C_O_WRITE;
58
59    if ((flags & O_ACCMODE) == O_WRONLY)
60        coda_flags |= C_O_WRITE;
61
62    if (flags & O_TRUNC)
63        coda_flags |= C_O_TRUNC;
64
65    if (flags & O_CREAT)
66        coda_flags |= C_O_CREAT;
67
68    if (flags & O_EXCL)
69        coda_flags |= C_O_EXCL;
70
71    return coda_flags;
72}
73
74
75/* utility functions below */
76void coda_vattr_to_iattr(struct inode *inode, struct coda_vattr *attr)
77{
78        int inode_type;
79        /* inode's i_flags, i_ino are set by iget
80           XXX: is this all we need ??
81           */
82        switch (attr->va_type) {
83        case C_VNON:
84                inode_type = 0;
85                break;
86        case C_VREG:
87                inode_type = S_IFREG;
88                break;
89        case C_VDIR:
90                inode_type = S_IFDIR;
91                break;
92        case C_VLNK:
93                inode_type = S_IFLNK;
94                break;
95        default:
96                inode_type = 0;
97        }
98    inode->i_mode |= inode_type;
99
100    if (attr->va_mode != (u_short) -1)
101            inode->i_mode = attr->va_mode | inode_type;
102        if (attr->va_uid != -1)
103            inode->i_uid = (uid_t) attr->va_uid;
104        if (attr->va_gid != -1)
105            inode->i_gid = (gid_t) attr->va_gid;
106    if (attr->va_nlink != -1)
107            inode->i_nlink = attr->va_nlink;
108    if (attr->va_size != -1)
109            inode->i_size = attr->va_size;
110    if (attr->va_size != -1)
111        inode->i_blocks = (attr->va_size + 511) >> 9;
112    if (attr->va_atime.tv_sec != -1)
113            inode->i_atime = attr->va_atime;
114    if (attr->va_mtime.tv_sec != -1)
115            inode->i_mtime = attr->va_mtime;
116        if (attr->va_ctime.tv_sec != -1)
117            inode->i_ctime = attr->va_ctime;
118}
119
120
121/*
122 * BSD sets attributes that need not be modified to -1.
123 * Linux uses the valid field to indicate what should be
124 * looked at. The BSD type field needs to be deduced from linux
125 * mode.
126 * So we have to do some translations here.
127 */
128
129void coda_iattr_to_vattr(struct iattr *iattr, struct coda_vattr *vattr)
130{
131        unsigned int valid;
132
133        /* clean out */
134    vattr->va_mode = -1;
135        vattr->va_uid = (vuid_t) -1;
136        vattr->va_gid = (vgid_t) -1;
137        vattr->va_size = (off_t) -1;
138    vattr->va_atime.tv_sec = (time_t) -1;
139    vattr->va_atime.tv_nsec = (time_t) -1;
140        vattr->va_mtime.tv_sec = (time_t) -1;
141        vattr->va_mtime.tv_nsec = (time_t) -1;
142    vattr->va_ctime.tv_sec = (time_t) -1;
143    vattr->va_ctime.tv_nsec = (time_t) -1;
144        vattr->va_type = C_VNON;
145    vattr->va_fileid = -1;
146    vattr->va_gen = -1;
147    vattr->va_bytes = -1;
148    vattr->va_nlink = -1;
149    vattr->va_blocksize = -1;
150    vattr->va_rdev = -1;
151        vattr->va_flags = 0;
152
153        /* determine the type */
154#if 0
155        mode = iattr->ia_mode;
156                if ( S_ISDIR(mode) ) {
157                vattr->va_type = C_VDIR;
158        } else if ( S_ISREG(mode) ) {
159                vattr->va_type = C_VREG;
160        } else if ( S_ISLNK(mode) ) {
161                vattr->va_type = C_VLNK;
162        } else {
163                /* don't do others */
164                vattr->va_type = C_VNON;
165        }
166#endif
167
168        /* set those vattrs that need change */
169        valid = iattr->ia_valid;
170        if ( valid & ATTR_MODE ) {
171                vattr->va_mode = iattr->ia_mode;
172    }
173        if ( valid & ATTR_UID ) {
174                vattr->va_uid = (vuid_t) iattr->ia_uid;
175    }
176        if ( valid & ATTR_GID ) {
177                vattr->va_gid = (vgid_t) iattr->ia_gid;
178    }
179        if ( valid & ATTR_SIZE ) {
180                vattr->va_size = iattr->ia_size;
181    }
182        if ( valid & ATTR_ATIME ) {
183                vattr->va_atime = iattr->ia_atime;
184    }
185        if ( valid & ATTR_MTIME ) {
186                vattr->va_mtime = iattr->ia_mtime;
187    }
188        if ( valid & ATTR_CTIME ) {
189                vattr->va_ctime = iattr->ia_ctime;
190    }
191}
192
193

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