1 /*
2 * Super block/filesystem wide operations
3 *
4 * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and
5 * Michael Callahan <callahan@maths.ox.ac.uk>
6 *
7 * Rewritten for Linux 2.1. Peter Braam <braam@cs.cmu.edu>
8 * Copyright (C) Carnegie Mellon University
9 */
10
11 #define __NO_VERSION__
12 #include <linux/module.h>
13 #include <linux/kernel.h>
14 #include <linux/mm.h>
15 #include <linux/string.h>
16 #include <linux/stat.h>
17 #include <linux/errno.h>
18 #include <linux/locks.h>
19 #include <linux/unistd.h>
20 #include <linux/smp_lock.h>
21 #include <linux/file.h>
22
23 #include <asm/system.h>
24 #include <asm/uaccess.h>
25
26 #include <linux/fs.h>
27 #include <linux/vmalloc.h>
28
29 #include <linux/coda.h>
30 #include <linux/coda_linux.h>
31 #include <linux/coda_psdev.h>
32 #include <linux/coda_fs_i.h>
33 #include <linux/coda_cache.h>
34
35 /* VFS super_block ops */
36 static struct super_block *coda_read_super(struct super_block *, void *, int);
37 static void coda_read_inode(struct inode *);
38 static void coda_clear_inode(struct inode *);
39 static void coda_put_super(struct super_block *);
40 static int coda_statfs(struct super_block *sb, struct statfs *buf);
41
42 /* exported operations */
43 struct super_operations coda_super_operations =
44 {
45 read_inode: coda_read_inode,
46 clear_inode: coda_clear_inode,
47 put_super: coda_put_super,
48 statfs: coda_statfs,
49 };
50
get_device_index(struct coda_mount_data * data)51 static int get_device_index(struct coda_mount_data *data)
52 {
53 struct file *file;
54 struct inode *inode;
55 int idx;
56
57 if(data == NULL) {
58 printk("coda_read_super: Bad mount data\n");
59 return -1;
60 }
61
62 if(data->version != CODA_MOUNT_VERSION) {
63 printk("coda_read_super: Bad mount version\n");
64 return -1;
65 }
66
67 file = fget(data->fd);
68 inode = NULL;
69 if(file)
70 inode = file->f_dentry->d_inode;
71
72 if(!inode || !S_ISCHR(inode->i_mode) ||
73 MAJOR(inode->i_rdev) != CODA_PSDEV_MAJOR) {
74 if(file)
75 fput(file);
76
77 printk("coda_read_super: Bad file\n");
78 return -1;
79 }
80
81 idx = MINOR(inode->i_rdev);
82 fput(file);
83
84 if(idx < 0 || idx >= MAX_CODADEVS) {
85 printk("coda_read_super: Bad minor number\n");
86 return -1;
87 }
88
89 return idx;
90 }
91
coda_read_super(struct super_block * sb,void * data,int silent)92 static struct super_block * coda_read_super(struct super_block *sb,
93 void *data, int silent)
94 {
95 struct inode *root = 0;
96 struct coda_sb_info *sbi = NULL;
97 struct venus_comm *vc = NULL;
98 ViceFid fid;
99 int error;
100 int idx;
101
102 idx = get_device_index((struct coda_mount_data *) data);
103
104 /* Ignore errors in data, for backward compatibility */
105 if(idx == -1)
106 idx = 0;
107
108 printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
109
110 vc = &coda_comms[idx];
111 if (!vc->vc_inuse) {
112 printk("coda_read_super: No pseudo device\n");
113 return NULL;
114 }
115
116 if ( vc->vc_sb ) {
117 printk("coda_read_super: Device already mounted\n");
118 return NULL;
119 }
120
121 sbi = kmalloc(sizeof(struct coda_sb_info), GFP_KERNEL);
122 if(!sbi) {
123 return NULL;
124 }
125
126 vc->vc_sb = sb;
127
128 sbi->sbi_sb = sb;
129 sbi->sbi_vcomm = vc;
130 INIT_LIST_HEAD(&sbi->sbi_cihead);
131 init_MUTEX(&sbi->sbi_iget4_mutex);
132
133 sb->u.generic_sbp = sbi;
134 sb->s_blocksize = 1024; /* XXXXX what do we put here?? */
135 sb->s_blocksize_bits = 10;
136 sb->s_magic = CODA_SUPER_MAGIC;
137 sb->s_op = &coda_super_operations;
138
139 /* get root fid from Venus: this needs the root inode */
140 error = venus_rootfid(sb, &fid);
141 if ( error ) {
142 printk("coda_read_super: coda_get_rootfid failed with %d\n",
143 error);
144 goto error;
145 }
146 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
147
148 /* make root inode */
149 error = coda_cnode_make(&root, &fid, sb);
150 if ( error || !root ) {
151 printk("Failure of coda_cnode_make for root: error %d\n", error);
152 goto error;
153 }
154
155 printk("coda_read_super: rootinode is %ld dev %d\n",
156 root->i_ino, root->i_dev);
157 sb->s_root = d_alloc_root(root);
158 return sb;
159
160 error:
161 if (sbi) {
162 kfree(sbi);
163 if(vc)
164 vc->vc_sb = NULL;
165 }
166 if (root)
167 iput(root);
168
169 return NULL;
170 }
171
coda_put_super(struct super_block * sb)172 static void coda_put_super(struct super_block *sb)
173 {
174 struct coda_sb_info *sbi;
175
176 sbi = coda_sbp(sb);
177 sbi->sbi_vcomm->vc_sb = NULL;
178 list_del_init(&sbi->sbi_cihead);
179
180 printk("Coda: Bye bye.\n");
181 kfree(sbi);
182 }
183
184 /* all filling in of inodes postponed until lookup */
coda_read_inode(struct inode * inode)185 static void coda_read_inode(struct inode *inode)
186 {
187 struct coda_sb_info *sbi = coda_sbp(inode->i_sb);
188 struct coda_inode_info *cii;
189
190 if (!sbi) BUG();
191
192 cii = ITOC(inode);
193 if (!coda_isnullfid(&cii->c_fid)) {
194 printk("coda_read_inode: initialized inode");
195 return;
196 }
197
198 cii->c_mapcount = 0;
199 list_add(&cii->c_cilist, &sbi->sbi_cihead);
200 }
201
coda_clear_inode(struct inode * inode)202 static void coda_clear_inode(struct inode *inode)
203 {
204 struct coda_inode_info *cii = ITOC(inode);
205
206 CDEBUG(D_SUPER, " inode->ino: %ld, count: %d\n",
207 inode->i_ino, atomic_read(&inode->i_count));
208 CDEBUG(D_DOWNCALL, "clearing inode: %ld, %x\n", inode->i_ino, cii->c_flags);
209
210 list_del_init(&cii->c_cilist);
211 coda_cache_clear_inode(inode);
212 }
213
coda_notify_change(struct dentry * de,struct iattr * iattr)214 int coda_notify_change(struct dentry *de, struct iattr *iattr)
215 {
216 struct inode *inode = de->d_inode;
217 struct coda_vattr vattr;
218 int error;
219
220 memset(&vattr, 0, sizeof(vattr));
221
222 inode->i_ctime = CURRENT_TIME;
223 coda_iattr_to_vattr(iattr, &vattr);
224 vattr.va_type = C_VNON; /* cannot set type */
225 CDEBUG(D_SUPER, "vattr.va_mode %o\n", vattr.va_mode);
226
227 /* Venus is responsible for truncating the container-file!!! */
228 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
229
230 if ( !error ) {
231 coda_vattr_to_iattr(inode, &vattr);
232 coda_cache_clear_inode(inode);
233 }
234 CDEBUG(D_SUPER, "inode.i_mode %o, error %d\n", inode->i_mode, error);
235
236 return error;
237 }
238
239 struct inode_operations coda_file_inode_operations = {
240 permission: coda_permission,
241 revalidate: coda_revalidate_inode,
242 setattr: coda_notify_change,
243 };
244
coda_statfs(struct super_block * sb,struct statfs * buf)245 static int coda_statfs(struct super_block *sb, struct statfs *buf)
246 {
247 int error;
248
249 error = venus_statfs(sb, buf);
250
251 if (error) {
252 /* fake something like AFS does */
253 buf->f_blocks = 9000000;
254 buf->f_bfree = 9000000;
255 buf->f_bavail = 9000000;
256 buf->f_files = 9000000;
257 buf->f_ffree = 9000000;
258 }
259
260 /* and fill in the rest */
261 buf->f_type = CODA_SUPER_MAGIC;
262 buf->f_bsize = 1024;
263 buf->f_namelen = CODA_MAXNAMLEN;
264
265 return 0;
266 }
267
268 /* init_coda: used by filesystems.c to register coda */
269
270 DECLARE_FSTYPE( coda_fs_type, "coda", coda_read_super, 0);
271
272