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 #include <linux/module.h>
12 #include <linux/kernel.h>
13 #include <linux/mm.h>
14 #include <linux/string.h>
15 #include <linux/stat.h>
16 #include <linux/errno.h>
17 #include <linux/unistd.h>
18 #include <linux/smp_lock.h>
19 #include <linux/file.h>
20 #include <linux/vfs.h>
21
22 #include <asm/system.h>
23 #include <asm/uaccess.h>
24
25 #include <linux/fs.h>
26 #include <linux/vmalloc.h>
27
28 #include <linux/coda.h>
29 #include <linux/coda_linux.h>
30 #include <linux/coda_psdev.h>
31 #include <linux/coda_fs_i.h>
32 #include <linux/coda_cache.h>
33
34 #include "coda_int.h"
35
36 /* VFS super_block ops */
37 static void coda_clear_inode(struct inode *);
38 static void coda_put_super(struct super_block *);
39 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);
40
41 static struct kmem_cache * coda_inode_cachep;
42
43 static struct inode *coda_alloc_inode(struct super_block *sb)
44 {
45 struct coda_inode_info *ei;
46 ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
47 if (!ei)
48 return NULL;
49 memset(&ei->c_fid, 0, sizeof(struct CodaFid));
50 ei->c_flags = 0;
51 ei->c_uid = 0;
52 ei->c_cached_perm = 0;
53 return &ei->vfs_inode;
54 }
55
56 static void coda_destroy_inode(struct inode *inode)
57 {
58 kmem_cache_free(coda_inode_cachep, ITOC(inode));
59 }
60
61 static void init_once(struct kmem_cache * cachep, void *foo)
62 {
63 struct coda_inode_info *ei = (struct coda_inode_info *) foo;
64
65 inode_init_once(&ei->vfs_inode);
66 }
67
68 int coda_init_inodecache(void)
69 {
70 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
71 sizeof(struct coda_inode_info),
72 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
73 init_once);
74 if (coda_inode_cachep == NULL)
75 return -ENOMEM;
76 return 0;
77 }
78
79 void coda_destroy_inodecache(void)
80 {
81 kmem_cache_destroy(coda_inode_cachep);
82 }
83
84 static int coda_remount(struct super_block *sb, int *flags, char *data)
85 {
86 *flags |= MS_NOATIME;
87 return 0;
88 }
89
90 /* exported operations */
91 static const struct super_operations coda_super_operations =
92 {
93 .alloc_inode = coda_alloc_inode,
94 .destroy_inode = coda_destroy_inode,
95 .clear_inode = coda_clear_inode,
96 .put_super = coda_put_super,
97 .statfs = coda_statfs,
98 .remount_fs = coda_remount,
99 };
100
101 static int get_device_index(struct coda_mount_data *data)
102 {
103 struct file *file;
104 struct inode *inode;
105 int idx;
106
107 if(data == NULL) {
108 printk("coda_read_super: Bad mount data\n");
109 return -1;
110 }
111
112 if(data->version != CODA_MOUNT_VERSION) {
113 printk("coda_read_super: Bad mount version\n");
114 return -1;
115 }
116
117 file = fget(data->fd);
118 inode = NULL;
119 if(file)
120 inode = file->f_path.dentry->d_inode;
121
122 if(!inode || !S_ISCHR(inode->i_mode) ||
123 imajor(inode) != CODA_PSDEV_MAJOR) {
124 if(file)
125 fput(file);
126
127 printk("coda_read_super: Bad file\n");
128 return -1;
129 }
130
131 idx = iminor(inode);
132 fput(file);
133
134 if(idx < 0 || idx >= MAX_CODADEVS) {
135 printk("coda_read_super: Bad minor number\n");
136 return -1;
137 }
138
139 return idx;
140 }
141
142 static int coda_fill_super(struct super_block *sb, void *data, int silent)
143 {
144 struct inode *root = NULL;
145 struct venus_comm *vc = NULL;
146 struct CodaFid fid;
147 int error;
148 int idx;
149
150 idx = get_device_index((struct coda_mount_data *) data);
151
152 /* Ignore errors in data, for backward compatibility */
153 if(idx == -1)
154 idx = 0;
155
156 printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
157
158 vc = &coda_comms[idx];
159 if (!vc->vc_inuse) {
160 printk("coda_read_super: No pseudo device\n");
161 return -EINVAL;
162 }
163
164 if ( vc->vc_sb ) {
165 printk("coda_read_super: Device already mounted\n");
166 return -EBUSY;
167 }
168
169 vc->vc_sb = sb;
170
171 sb->s_fs_info = vc;
172 sb->s_flags |= MS_NOATIME;
173 sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
174 sb->s_blocksize_bits = 12;
175 sb->s_magic = CODA_SUPER_MAGIC;
176 sb->s_op = &coda_super_operations;
177
178 /* get root fid from Venus: this needs the root inode */
179 error = venus_rootfid(sb, &fid);
180 if ( error ) {
181 printk("coda_read_super: coda_get_rootfid failed with %d\n",
182 error);
183 goto error;
184 }
185 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
186
187 /* make root inode */
188 error = coda_cnode_make(&root, &fid, sb);
189 if ( error || !root ) {
190 printk("Failure of coda_cnode_make for root: error %d\n", error);
191 goto error;
192 }
193
194 printk("coda_read_super: rootinode is %ld dev %s\n",
195 root->i_ino, root->i_sb->s_id);
196 sb->s_root = d_alloc_root(root);
197 if (!sb->s_root)
198 goto error;
199 return 0;
200
201 error:
202 if (root)
203 iput(root);
204 if (vc)
205 vc->vc_sb = NULL;
206
207 return -EINVAL;
208 }
209
210 static void coda_put_super(struct super_block *sb)
211 {
212 coda_vcp(sb)->vc_sb = NULL;
213 sb->s_fs_info = NULL;
214
215 printk("Coda: Bye bye.\n");
216 }
217
218 static void coda_clear_inode(struct inode *inode)
219 {
220 coda_cache_clear_inode(inode);
221 }
222
223 int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
224 {
225 int err = coda_revalidate_inode(dentry);
226 if (!err)
227 generic_fillattr(dentry->d_inode, stat);
228 return err;
229 }
230
231 int coda_setattr(struct dentry *de, struct iattr *iattr)
232 {
233 struct inode *inode = de->d_inode;
234 struct coda_vattr vattr;
235 int error;
236
237 lock_kernel();
238
239 memset(&vattr, 0, sizeof(vattr));
240
241 inode->i_ctime = CURRENT_TIME_SEC;
242 coda_iattr_to_vattr(iattr, &vattr);
243 vattr.va_type = C_VNON; /* cannot set type */
244
245 /* Venus is responsible for truncating the container-file!!! */
246 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
247
248 if ( !error ) {
249 coda_vattr_to_iattr(inode, &vattr);
250 coda_cache_clear_inode(inode);
251 }
252
253 unlock_kernel();
254
255 return error;
256 }
257
258 const struct inode_operations coda_file_inode_operations = {
259 .permission = coda_permission,
260 .getattr = coda_getattr,
261 .setattr = coda_setattr,
262 };
263
264 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
265 {
266 int error;
267
268 lock_kernel();
269
270 error = venus_statfs(dentry, buf);
271
272 unlock_kernel();
273
274 if (error) {
275 /* fake something like AFS does */
276 buf->f_blocks = 9000000;
277 buf->f_bfree = 9000000;
278 buf->f_bavail = 9000000;
279 buf->f_files = 9000000;
280 buf->f_ffree = 9000000;
281 }
282
283 /* and fill in the rest */
284 buf->f_type = CODA_SUPER_MAGIC;
285 buf->f_bsize = 4096;
286 buf->f_namelen = CODA_MAXNAMLEN;
287
288 return 0;
289 }
290
291 /* init_coda: used by filesystems.c to register coda */
292
293 static int coda_get_sb(struct file_system_type *fs_type,
294 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
295 {
296 return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt);
297 }
298
299 struct file_system_type coda_fs_type = {
300 .owner = THIS_MODULE,
301 .name = "coda",
302 .get_sb = coda_get_sb,
303 .kill_sb = kill_anon_super,
304 .fs_flags = FS_BINARY_MOUNTDATA,
305 };
306
307
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