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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/system.h>
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 = 0;
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 INIT_LIST_HEAD(&inode->i_dentry);
62 kmem_cache_free(coda_inode_cachep, ITOC(inode));
63}
64
65static void coda_destroy_inode(struct inode *inode)
66{
67 call_rcu(&inode->i_rcu, coda_i_callback);
68}
69
70static void init_once(void *foo)
71{
72 struct coda_inode_info *ei = (struct coda_inode_info *) foo;
73
74 inode_init_once(&ei->vfs_inode);
75}
76
77int coda_init_inodecache(void)
78{
79 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
80 sizeof(struct coda_inode_info),
81 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
82 init_once);
83 if (coda_inode_cachep == NULL)
84 return -ENOMEM;
85 return 0;
86}
87
88void coda_destroy_inodecache(void)
89{
90 kmem_cache_destroy(coda_inode_cachep);
91}
92
93static int coda_remount(struct super_block *sb, int *flags, char *data)
94{
95 *flags |= MS_NOATIME;
96 return 0;
97}
98
99
100static const struct super_operations coda_super_operations =
101{
102 .alloc_inode = coda_alloc_inode,
103 .destroy_inode = coda_destroy_inode,
104 .evict_inode = coda_evict_inode,
105 .put_super = coda_put_super,
106 .statfs = coda_statfs,
107 .remount_fs = coda_remount,
108};
109
110static int get_device_index(struct coda_mount_data *data)
111{
112 struct file *file;
113 struct inode *inode;
114 int idx;
115
116 if(data == NULL) {
117 printk("coda_read_super: Bad mount data\n");
118 return -1;
119 }
120
121 if(data->version != CODA_MOUNT_VERSION) {
122 printk("coda_read_super: Bad mount version\n");
123 return -1;
124 }
125
126 file = fget(data->fd);
127 inode = NULL;
128 if(file)
129 inode = file->f_path.dentry->d_inode;
130
131 if(!inode || !S_ISCHR(inode->i_mode) ||
132 imajor(inode) != CODA_PSDEV_MAJOR) {
133 if(file)
134 fput(file);
135
136 printk("coda_read_super: Bad file\n");
137 return -1;
138 }
139
140 idx = iminor(inode);
141 fput(file);
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;
149}
150
151static int coda_fill_super(struct super_block *sb, void *data, int silent)
152{
153 struct inode *root = NULL;
154 struct venus_comm *vc;
155 struct CodaFid fid;
156 int error;
157 int idx;
158
159 idx = get_device_index((struct coda_mount_data *) data);
160
161
162 if(idx == -1)
163 idx = 0;
164
165 printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
166
167 vc = &coda_comms[idx];
168 mutex_lock(&vc->vc_mutex);
169
170 if (!vc->vc_inuse) {
171 printk("coda_read_super: No pseudo device\n");
172 error = -EINVAL;
173 goto unlock_out;
174 }
175
176 if (vc->vc_sb) {
177 printk("coda_read_super: Device already mounted\n");
178 error = -EBUSY;
179 goto unlock_out;
180 }
181
182 error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
183 if (error)
184 goto unlock_out;
185
186 vc->vc_sb = sb;
187 mutex_unlock(&vc->vc_mutex);
188
189 sb->s_fs_info = vc;
190 sb->s_flags |= MS_NOATIME;
191 sb->s_blocksize = 4096;
192 sb->s_blocksize_bits = 12;
193 sb->s_magic = CODA_SUPER_MAGIC;
194 sb->s_op = &coda_super_operations;
195 sb->s_d_op = &coda_dentry_operations;
196 sb->s_bdi = &vc->bdi;
197
198
199 error = venus_rootfid(sb, &fid);
200 if ( error ) {
201 printk("coda_read_super: coda_get_rootfid failed with %d\n",
202 error);
203 goto error;
204 }
205 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
206
207
208 error = coda_cnode_make(&root, &fid, sb);
209 if ( error || !root ) {
210 printk("Failure of coda_cnode_make for root: error %d\n", error);
211 goto error;
212 }
213
214 printk("coda_read_super: rootinode is %ld dev %s\n",
215 root->i_ino, root->i_sb->s_id);
216 sb->s_root = d_alloc_root(root);
217 if (!sb->s_root) {
218 error = -EINVAL;
219 goto error;
220 }
221 return 0;
222
223error:
224 if (root)
225 iput(root);
226
227 mutex_lock(&vc->vc_mutex);
228 bdi_destroy(&vc->bdi);
229 vc->vc_sb = NULL;
230 sb->s_fs_info = NULL;
231unlock_out:
232 mutex_unlock(&vc->vc_mutex);
233 return error;
234}
235
236static void coda_put_super(struct super_block *sb)
237{
238 struct venus_comm *vcp = coda_vcp(sb);
239 mutex_lock(&vcp->vc_mutex);
240 bdi_destroy(&vcp->bdi);
241 vcp->vc_sb = NULL;
242 sb->s_fs_info = NULL;
243 mutex_unlock(&vcp->vc_mutex);
244
245 printk("Coda: Bye bye.\n");
246}
247
248static void coda_evict_inode(struct inode *inode)
249{
250 truncate_inode_pages(&inode->i_data, 0);
251 end_writeback(inode);
252 coda_cache_clear_inode(inode);
253}
254
255int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
256{
257 int err = coda_revalidate_inode(dentry);
258 if (!err)
259 generic_fillattr(dentry->d_inode, stat);
260 return err;
261}
262
263int coda_setattr(struct dentry *de, struct iattr *iattr)
264{
265 struct inode *inode = de->d_inode;
266 struct coda_vattr vattr;
267 int error;
268
269 memset(&vattr, 0, sizeof(vattr));
270
271 inode->i_ctime = CURRENT_TIME_SEC;
272 coda_iattr_to_vattr(iattr, &vattr);
273 vattr.va_type = C_VNON;
274
275
276 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
277
278 if (!error) {
279 coda_vattr_to_iattr(inode, &vattr);
280 coda_cache_clear_inode(inode);
281 }
282 return error;
283}
284
285const struct inode_operations coda_file_inode_operations = {
286 .permission = coda_permission,
287 .getattr = coda_getattr,
288 .setattr = coda_setattr,
289};
290
291static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
292{
293 int error;
294
295 error = venus_statfs(dentry, buf);
296
297 if (error) {
298
299 buf->f_blocks = 9000000;
300 buf->f_bfree = 9000000;
301 buf->f_bavail = 9000000;
302 buf->f_files = 9000000;
303 buf->f_ffree = 9000000;
304 }
305
306
307 buf->f_type = CODA_SUPER_MAGIC;
308 buf->f_bsize = 4096;
309 buf->f_namelen = CODA_MAXNAMLEN;
310
311 return 0;
312}
313
314
315
316static struct dentry *coda_mount(struct file_system_type *fs_type,
317 int flags, const char *dev_name, void *data)
318{
319 return mount_nodev(fs_type, flags, data, coda_fill_super);
320}
321
322struct file_system_type coda_fs_type = {
323 .owner = THIS_MODULE,
324 .name = "coda",
325 .mount = coda_mount,
326 .kill_sb = kill_anon_super,
327 .fs_flags = FS_BINARY_MOUNTDATA,
328};
329
330
