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12#include <linux/module.h>
13#include <linux/kernel.h>
14#include <linux/mm.h>
15#include <linux/string.h>
16#include <linux/stat.h>
17#include <linux/errno.h>
18#include <linux/unistd.h>
19#include <linux/mutex.h>
20#include <linux/spinlock.h>
21#include <linux/file.h>
22#include <linux/vfs.h>
23#include <linux/slab.h>
24#include <linux/pid_namespace.h>
25#include <linux/uaccess.h>
26#include <linux/fs.h>
27#include <linux/vmalloc.h>
28
29#include <linux/coda.h>
30#include "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 = GLOBAL_ROOT_UID;
52 ei->c_cached_perm = 0;
53 spin_lock_init(&ei->c_lock);
54 return &ei->vfs_inode;
55}
56
57static void coda_free_inode(struct inode *inode)
58{
59 kmem_cache_free(coda_inode_cachep, ITOC(inode));
60}
61
62static void init_once(void *foo)
63{
64 struct coda_inode_info *ei = (struct coda_inode_info *) foo;
65
66 inode_init_once(&ei->vfs_inode);
67}
68
69int __init coda_init_inodecache(void)
70{
71 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
72 sizeof(struct coda_inode_info), 0,
73 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
74 SLAB_ACCOUNT, init_once);
75 if (coda_inode_cachep == NULL)
76 return -ENOMEM;
77 return 0;
78}
79
80void coda_destroy_inodecache(void)
81{
82
83
84
85
86 rcu_barrier();
87 kmem_cache_destroy(coda_inode_cachep);
88}
89
90static int coda_remount(struct super_block *sb, int *flags, char *data)
91{
92 sync_filesystem(sb);
93 *flags |= SB_NOATIME;
94 return 0;
95}
96
97
98static const struct super_operations coda_super_operations =
99{
100 .alloc_inode = coda_alloc_inode,
101 .free_inode = coda_free_inode,
102 .evict_inode = coda_evict_inode,
103 .put_super = coda_put_super,
104 .statfs = coda_statfs,
105 .remount_fs = coda_remount,
106};
107
108static int get_device_index(struct coda_mount_data *data)
109{
110 struct fd f;
111 struct inode *inode;
112 int idx;
113
114 if (data == NULL) {
115 pr_warn("%s: Bad mount data\n", __func__);
116 return -1;
117 }
118
119 if (data->version != CODA_MOUNT_VERSION) {
120 pr_warn("%s: Bad mount version\n", __func__);
121 return -1;
122 }
123
124 f = fdget(data->fd);
125 if (!f.file)
126 goto Ebadf;
127 inode = file_inode(f.file);
128 if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
129 fdput(f);
130 goto Ebadf;
131 }
132
133 idx = iminor(inode);
134 fdput(f);
135
136 if (idx < 0 || idx >= MAX_CODADEVS) {
137 pr_warn("%s: Bad minor number\n", __func__);
138 return -1;
139 }
140
141 return idx;
142Ebadf:
143 pr_warn("%s: Bad file\n", __func__);
144 return -1;
145}
146
147static int coda_fill_super(struct super_block *sb, void *data, int silent)
148{
149 struct inode *root = NULL;
150 struct venus_comm *vc;
151 struct CodaFid fid;
152 int error;
153 int idx;
154
155 if (task_active_pid_ns(current) != &init_pid_ns)
156 return -EINVAL;
157
158 idx = get_device_index((struct coda_mount_data *) data);
159
160
161 if(idx == -1)
162 idx = 0;
163
164 pr_info("%s: device index: %i\n", __func__, idx);
165
166 vc = &coda_comms[idx];
167 mutex_lock(&vc->vc_mutex);
168
169 if (!vc->vc_inuse) {
170 pr_warn("%s: No pseudo device\n", __func__);
171 error = -EINVAL;
172 goto unlock_out;
173 }
174
175 if (vc->vc_sb) {
176 pr_warn("%s: Device already mounted\n", __func__);
177 error = -EBUSY;
178 goto unlock_out;
179 }
180
181 vc->vc_sb = sb;
182 mutex_unlock(&vc->vc_mutex);
183
184 sb->s_fs_info = vc;
185 sb->s_flags |= SB_NOATIME;
186 sb->s_blocksize = 4096;
187 sb->s_blocksize_bits = 12;
188 sb->s_magic = CODA_SUPER_MAGIC;
189 sb->s_op = &coda_super_operations;
190 sb->s_d_op = &coda_dentry_operations;
191
192 error = super_setup_bdi(sb);
193 if (error)
194 goto error;
195
196
197 error = venus_rootfid(sb, &fid);
198 if ( error ) {
199 pr_warn("%s: coda_get_rootfid failed with %d\n",
200 __func__, error);
201 goto error;
202 }
203 pr_info("%s: rootfid is %s\n", __func__, coda_f2s(&fid));
204
205
206 root = coda_cnode_make(&fid, sb);
207 if (IS_ERR(root)) {
208 error = PTR_ERR(root);
209 pr_warn("Failure of coda_cnode_make for root: error %d\n",
210 error);
211 goto error;
212 }
213
214 pr_info("%s: rootinode is %ld dev %s\n",
215 __func__, root->i_ino, root->i_sb->s_id);
216 sb->s_root = d_make_root(root);
217 if (!sb->s_root) {
218 error = -EINVAL;
219 goto error;
220 }
221 return 0;
222
223error:
224 mutex_lock(&vc->vc_mutex);
225 vc->vc_sb = NULL;
226 sb->s_fs_info = NULL;
227unlock_out:
228 mutex_unlock(&vc->vc_mutex);
229 return error;
230}
231
232static void coda_put_super(struct super_block *sb)
233{
234 struct venus_comm *vcp = coda_vcp(sb);
235 mutex_lock(&vcp->vc_mutex);
236 vcp->vc_sb = NULL;
237 sb->s_fs_info = NULL;
238 mutex_unlock(&vcp->vc_mutex);
239 mutex_destroy(&vcp->vc_mutex);
240
241 pr_info("Bye bye.\n");
242}
243
244static void coda_evict_inode(struct inode *inode)
245{
246 truncate_inode_pages_final(&inode->i_data);
247 clear_inode(inode);
248 coda_cache_clear_inode(inode);
249}
250
251int coda_getattr(const struct path *path, struct kstat *stat,
252 u32 request_mask, unsigned int flags)
253{
254 int err = coda_revalidate_inode(d_inode(path->dentry));
255 if (!err)
256 generic_fillattr(d_inode(path->dentry), stat);
257 return err;
258}
259
260int coda_setattr(struct dentry *de, struct iattr *iattr)
261{
262 struct inode *inode = d_inode(de);
263 struct coda_vattr vattr;
264 int error;
265
266 memset(&vattr, 0, sizeof(vattr));
267
268 inode->i_ctime = current_time(inode);
269 coda_iattr_to_vattr(iattr, &vattr);
270 vattr.va_type = C_VNON;
271
272
273 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
274
275 if (!error) {
276 coda_vattr_to_iattr(inode, &vattr);
277 coda_cache_clear_inode(inode);
278 }
279 return error;
280}
281
282const struct inode_operations coda_file_inode_operations = {
283 .permission = coda_permission,
284 .getattr = coda_getattr,
285 .setattr = coda_setattr,
286};
287
288static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
289{
290 int error;
291
292 error = venus_statfs(dentry, buf);
293
294 if (error) {
295
296 buf->f_blocks = 9000000;
297 buf->f_bfree = 9000000;
298 buf->f_bavail = 9000000;
299 buf->f_files = 9000000;
300 buf->f_ffree = 9000000;
301 }
302
303
304 buf->f_type = CODA_SUPER_MAGIC;
305 buf->f_bsize = 4096;
306 buf->f_namelen = CODA_MAXNAMLEN;
307
308 return 0;
309}
310
311
312
313static struct dentry *coda_mount(struct file_system_type *fs_type,
314 int flags, const char *dev_name, void *data)
315{
316 return mount_nodev(fs_type, flags, data, coda_fill_super);
317}
318
319struct file_system_type coda_fs_type = {
320 .owner = THIS_MODULE,
321 .name = "coda",
322 .mount = coda_mount,
323 .kill_sb = kill_anon_super,
324 .fs_flags = FS_BINARY_MOUNTDATA,
325};
326MODULE_ALIAS_FS("coda");
327
328