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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 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 *flags |= MS_NOATIME;
100 return 0;
101}
102
103
104static const struct super_operations coda_super_operations =
105{
106 .alloc_inode = coda_alloc_inode,
107 .destroy_inode = coda_destroy_inode,
108 .evict_inode = coda_evict_inode,
109 .put_super = coda_put_super,
110 .statfs = coda_statfs,
111 .remount_fs = coda_remount,
112};
113
114static int get_device_index(struct coda_mount_data *data)
115{
116 struct fd f;
117 struct inode *inode;
118 int idx;
119
120 if (data == NULL) {
121 printk("coda_read_super: Bad mount data\n");
122 return -1;
123 }
124
125 if (data->version != CODA_MOUNT_VERSION) {
126 printk("coda_read_super: Bad mount version\n");
127 return -1;
128 }
129
130 f = fdget(data->fd);
131 if (!f.file)
132 goto Ebadf;
133 inode = file_inode(f.file);
134 if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
135 fdput(f);
136 goto Ebadf;
137 }
138
139 idx = iminor(inode);
140 fdput(f);
141
142 if (idx < 0 || idx >= MAX_CODADEVS) {
143 printk("coda_read_super: Bad minor number\n");
144 return -1;
145 }
146
147 return idx;
148Ebadf:
149 printk("coda_read_super: Bad file\n");
150 return -1;
151}
152
153static int coda_fill_super(struct super_block *sb, void *data, int silent)
154{
155 struct inode *root = NULL;
156 struct venus_comm *vc;
157 struct CodaFid fid;
158 int error;
159 int idx;
160
161 if (task_active_pid_ns(current) != &init_pid_ns)
162 return -EINVAL;
163
164 idx = get_device_index((struct coda_mount_data *) data);
165
166
167 if(idx == -1)
168 idx = 0;
169
170 printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
171
172 vc = &coda_comms[idx];
173 mutex_lock(&vc->vc_mutex);
174
175 if (!vc->vc_inuse) {
176 printk("coda_read_super: No pseudo device\n");
177 error = -EINVAL;
178 goto unlock_out;
179 }
180
181 if (vc->vc_sb) {
182 printk("coda_read_super: Device already mounted\n");
183 error = -EBUSY;
184 goto unlock_out;
185 }
186
187 error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
188 if (error)
189 goto unlock_out;
190
191 vc->vc_sb = sb;
192 mutex_unlock(&vc->vc_mutex);
193
194 sb->s_fs_info = vc;
195 sb->s_flags |= MS_NOATIME;
196 sb->s_blocksize = 4096;
197 sb->s_blocksize_bits = 12;
198 sb->s_magic = CODA_SUPER_MAGIC;
199 sb->s_op = &coda_super_operations;
200 sb->s_d_op = &coda_dentry_operations;
201 sb->s_bdi = &vc->bdi;
202
203
204 error = venus_rootfid(sb, &fid);
205 if ( error ) {
206 printk("coda_read_super: coda_get_rootfid failed with %d\n",
207 error);
208 goto error;
209 }
210 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
211
212
213 root = coda_cnode_make(&fid, sb);
214 if (IS_ERR(root)) {
215 error = PTR_ERR(root);
216 printk("Failure of coda_cnode_make for root: error %d\n", error);
217 goto error;
218 }
219
220 printk("coda_read_super: rootinode is %ld dev %s\n",
221 root->i_ino, root->i_sb->s_id);
222 sb->s_root = d_make_root(root);
223 if (!sb->s_root) {
224 error = -EINVAL;
225 goto error;
226 }
227 return 0;
228
229error:
230 mutex_lock(&vc->vc_mutex);
231 bdi_destroy(&vc->bdi);
232 vc->vc_sb = NULL;
233 sb->s_fs_info = NULL;
234unlock_out:
235 mutex_unlock(&vc->vc_mutex);
236 return error;
237}
238
239static void coda_put_super(struct super_block *sb)
240{
241 struct venus_comm *vcp = coda_vcp(sb);
242 mutex_lock(&vcp->vc_mutex);
243 bdi_destroy(&vcp->bdi);
244 vcp->vc_sb = NULL;
245 sb->s_fs_info = NULL;
246 mutex_unlock(&vcp->vc_mutex);
247
248 printk("Coda: Bye bye.\n");
249}
250
251static void coda_evict_inode(struct inode *inode)
252{
253 truncate_inode_pages(&inode->i_data, 0);
254 clear_inode(inode);
255 coda_cache_clear_inode(inode);
256}
257
258int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
259{
260 int err = coda_revalidate_inode(dentry);
261 if (!err)
262 generic_fillattr(dentry->d_inode, stat);
263 return err;
264}
265
266int coda_setattr(struct dentry *de, struct iattr *iattr)
267{
268 struct inode *inode = de->d_inode;
269 struct coda_vattr vattr;
270 int error;
271
272 memset(&vattr, 0, sizeof(vattr));
273
274 inode->i_ctime = CURRENT_TIME_SEC;
275 coda_iattr_to_vattr(iattr, &vattr);
276 vattr.va_type = C_VNON;
277
278
279 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
280
281 if (!error) {
282 coda_vattr_to_iattr(inode, &vattr);
283 coda_cache_clear_inode(inode);
284 }
285 return error;
286}
287
288const struct inode_operations coda_file_inode_operations = {
289 .permission = coda_permission,
290 .getattr = coda_getattr,
291 .setattr = coda_setattr,
292};
293
294static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
295{
296 int error;
297
298 error = venus_statfs(dentry, buf);
299
300 if (error) {
301
302 buf->f_blocks = 9000000;
303 buf->f_bfree = 9000000;
304 buf->f_bavail = 9000000;
305 buf->f_files = 9000000;
306 buf->f_ffree = 9000000;
307 }
308
309
310 buf->f_type = CODA_SUPER_MAGIC;
311 buf->f_bsize = 4096;
312 buf->f_namelen = CODA_MAXNAMLEN;
313
314 return 0;
315}
316
317
318
319static struct dentry *coda_mount(struct file_system_type *fs_type,
320 int flags, const char *dev_name, void *data)
321{
322 return mount_nodev(fs_type, flags, data, coda_fill_super);
323}
324
325struct file_system_type coda_fs_type = {
326 .owner = THIS_MODULE,
327 .name = "coda",
328 .mount = coda_mount,
329 .kill_sb = kill_anon_super,
330 .fs_flags = FS_BINARY_MOUNTDATA,
331};
332MODULE_ALIAS_FS("coda");
333
334
