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