1
2
3
4
5
6
7
8
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/mutex.h>
19#include <linux/spinlock.h>
20#include <linux/file.h>
21#include <linux/vfs.h>
22#include <linux/slab.h>
23#include <linux/pid_namespace.h>
24
25#include <asm/uaccess.h>
26
27#include <linux/fs.h>
28#include <linux/vmalloc.h>
29
30#include <linux/coda.h>
31#include <linux/coda_psdev.h>
32#include "coda_linux.h"
33#include "coda_cache.h"
34
35#include "coda_int.h"
36
37
38static void coda_evict_inode(struct inode *);
39static void coda_put_super(struct super_block *);
40static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);
41
42static struct kmem_cache * coda_inode_cachep;
43
44static struct inode *coda_alloc_inode(struct super_block *sb)
45{
46 struct coda_inode_info *ei;
47 ei = kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
48 if (!ei)
49 return NULL;
50 memset(&ei->c_fid, 0, sizeof(struct CodaFid));
51 ei->c_flags = 0;
52 ei->c_uid = GLOBAL_ROOT_UID;
53 ei->c_cached_perm = 0;
54 spin_lock_init(&ei->c_lock);
55 return &ei->vfs_inode;
56}
57
58static void coda_i_callback(struct rcu_head *head)
59{
60 struct inode *inode = container_of(head, struct inode, i_rcu);
61 kmem_cache_free(coda_inode_cachep, ITOC(inode));
62}
63
64static void coda_destroy_inode(struct inode *inode)
65{
66 call_rcu(&inode->i_rcu, coda_i_callback);
67}
68
69static void init_once(void *foo)
70{
71 struct coda_inode_info *ei = (struct coda_inode_info *) foo;
72
73 inode_init_once(&ei->vfs_inode);
74}
75
76int __init coda_init_inodecache(void)
77{
78 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
79 sizeof(struct coda_inode_info),
80 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
81 init_once);
82 if (coda_inode_cachep == NULL)
83 return -ENOMEM;
84 return 0;
85}
86
87void coda_destroy_inodecache(void)
88{
89
90
91
92
93 rcu_barrier();
94 kmem_cache_destroy(coda_inode_cachep);
95}
96
97static int coda_remount(struct super_block *sb, int *flags, char *data)
98{
99 sync_filesystem(sb);
100 *flags |= MS_NOATIME;
101 return 0;
102}
103
104
105static const struct super_operations coda_super_operations =
106{
107 .alloc_inode = coda_alloc_inode,
108 .destroy_inode = coda_destroy_inode,
109 .evict_inode = coda_evict_inode,
110 .put_super = coda_put_super,
111 .statfs = coda_statfs,
112 .remount_fs = coda_remount,
113};
114
115static int get_device_index(struct coda_mount_data *data)
116{
117 struct fd f;
118 struct inode *inode;
119 int idx;
120
121 if (data == NULL) {
122 printk("coda_read_super: Bad mount data\n");
123 return -1;
124 }
125
126 if (data->version != CODA_MOUNT_VERSION) {
127 printk("coda_read_super: Bad mount version\n");
128 return -1;
129 }
130
131 f = fdget(data->fd);
132 if (!f.file)
133 goto Ebadf;
134 inode = file_inode(f.file);
135 if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
136 fdput(f);
137 goto Ebadf;
138 }
139
140 idx = iminor(inode);
141 fdput(f);
142
143 if (idx < 0 || idx >= MAX_CODADEVS) {
144 printk("coda_read_super: Bad minor number\n");
145 return -1;
146 }
147
148 return idx;
149Ebadf:
150 printk("coda_read_super: Bad file\n");
151 return -1;
152}
153
154static int coda_fill_super(struct super_block *sb, void *data, int silent)
155{
156 struct inode *root = NULL;
157 struct venus_comm *vc;
158 struct CodaFid fid;
159 int error;
160 int idx;
161
162 if (task_active_pid_ns(current) != &init_pid_ns)
163 return -EINVAL;
164
165 idx = get_device_index((struct coda_mount_data *) data);
166
167
168 if(idx == -1)
169 idx = 0;
170
171 printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
172
173 vc = &coda_comms[idx];
174 mutex_lock(&vc->vc_mutex);
175
176 if (!vc->vc_inuse) {
177 printk("coda_read_super: No pseudo device\n");
178 error = -EINVAL;
179 goto unlock_out;
180 }
181
182 if (vc->vc_sb) {
183 printk("coda_read_super: Device already mounted\n");
184 error = -EBUSY;
185 goto unlock_out;
186 }
187
188 error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
189 if (error)
190 goto unlock_out;
191
192 vc->vc_sb = sb;
193 mutex_unlock(&vc->vc_mutex);
194
195 sb->s_fs_info = vc;
196 sb->s_flags |= MS_NOATIME;
197 sb->s_blocksize = 4096;
198 sb->s_blocksize_bits = 12;
199 sb->s_magic = CODA_SUPER_MAGIC;
200 sb->s_op = &coda_super_operations;
201 sb->s_d_op = &coda_dentry_operations;
202 sb->s_bdi = &vc->bdi;
203
204
205 error = venus_rootfid(sb, &fid);
206 if ( error ) {
207 printk("coda_read_super: coda_get_rootfid failed with %d\n",
208 error);
209 goto error;
210 }
211 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
212
213
214 root = coda_cnode_make(&fid, sb);
215 if (IS_ERR(root)) {
216 error = PTR_ERR(root);
217 printk("Failure of coda_cnode_make for root: error %d\n", error);
218 goto error;
219 }
220
221 printk("coda_read_super: rootinode is %ld dev %s\n",
222 root->i_ino, root->i_sb->s_id);
223 sb->s_root = d_make_root(root);
224 if (!sb->s_root) {
225 error = -EINVAL;
226 goto error;
227 }
228 return 0;
229
230error:
231 mutex_lock(&vc->vc_mutex);
232 bdi_destroy(&vc->bdi);
233 vc->vc_sb = NULL;
234 sb->s_fs_info = NULL;
235unlock_out:
236 mutex_unlock(&vc->vc_mutex);
237 return error;
238}
239
240static void coda_put_super(struct super_block *sb)
241{
242 struct venus_comm *vcp = coda_vcp(sb);
243 mutex_lock(&vcp->vc_mutex);
244 bdi_destroy(&vcp->bdi);
245 vcp->vc_sb = NULL;
246 sb->s_fs_info = NULL;
247 mutex_unlock(&vcp->vc_mutex);
248
249 printk("Coda: Bye bye.\n");
250}
251
252static void coda_evict_inode(struct inode *inode)
253{
254 truncate_inode_pages_final(&inode->i_data);
255 clear_inode(inode);
256 coda_cache_clear_inode(inode);
257}
258
259int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
260{
261 int err = coda_revalidate_inode(dentry->d_inode);
262 if (!err)
263 generic_fillattr(dentry->d_inode, stat);
264 return err;
265}
266
267int coda_setattr(struct dentry *de, struct iattr *iattr)
268{
269 struct inode *inode = de->d_inode;
270 struct coda_vattr vattr;
271 int error;
272
273 memset(&vattr, 0, sizeof(vattr));
274
275 inode->i_ctime = CURRENT_TIME_SEC;
276 coda_iattr_to_vattr(iattr, &vattr);
277 vattr.va_type = C_VNON;
278
279
280 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
281
282 if (!error) {
283 coda_vattr_to_iattr(inode, &vattr);
284 coda_cache_clear_inode(inode);
285 }
286 return error;
287}
288
289const struct inode_operations coda_file_inode_operations = {
290 .permission = coda_permission,
291 .getattr = coda_getattr,
292 .setattr = coda_setattr,
293};
294
295static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
296{
297 int error;
298
299 error = venus_statfs(dentry, buf);
300
301 if (error) {
302
303 buf->f_blocks = 9000000;
304 buf->f_bfree = 9000000;
305 buf->f_bavail = 9000000;
306 buf->f_files = 9000000;
307 buf->f_ffree = 9000000;
308 }
309
310
311 buf->f_type = CODA_SUPER_MAGIC;
312 buf->f_bsize = 4096;
313 buf->f_namelen = CODA_MAXNAMLEN;
314
315 return 0;
316}
317
318
319
320static struct dentry *coda_mount(struct file_system_type *fs_type,
321 int flags, const char *dev_name, void *data)
322{
323 return mount_nodev(fs_type, flags, data, coda_fill_super);
324}
325
326struct file_system_type coda_fs_type = {
327 .owner = THIS_MODULE,
328 .name = "coda",
329 .mount = coda_mount,
330 .kill_sb = kill_anon_super,
331 .fs_flags = FS_BINARY_MOUNTDATA,
332};
333MODULE_ALIAS_FS("coda");
334
335
