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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * Super block/filesystem wide operations
3 *
4 * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and
5 * Michael Callahan <callahan@maths.ox.ac.uk>
6 *
7 * Rewritten for Linux 2.1. Peter Braam <braam@cs.cmu.edu>
8 * Copyright (C) Carnegie Mellon University
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/smp_lock.h>
19#include <linux/file.h>
20#include <linux/vfs.h>
21
22#include <asm/system.h>
23#include <asm/uaccess.h>
24
25#include <linux/fs.h>
26#include <linux/vmalloc.h>
27
28#include <linux/coda.h>
29#include <linux/coda_linux.h>
30#include <linux/coda_psdev.h>
31#include <linux/coda_fs_i.h>
32#include <linux/coda_cache.h>
33
Adrian Bunkc98d8cf2006-03-24 03:15:53 -080034#include "coda_int.h"
35
Linus Torvalds1da177e2005-04-16 15:20:36 -070036/* VFS super_block ops */
37static void coda_clear_inode(struct inode *);
38static void coda_put_super(struct super_block *);
David Howells726c3342006-06-23 02:02:58 -070039static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070040
Christoph Lametere18b8902006-12-06 20:33:20 -080041static struct kmem_cache * coda_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070042
43static struct inode *coda_alloc_inode(struct super_block *sb)
44{
45 struct coda_inode_info *ei;
Christoph Lametere94b1762006-12-06 20:33:17 -080046 ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 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 return &ei->vfs_inode;
54}
55
56static void coda_destroy_inode(struct inode *inode)
57{
58 kmem_cache_free(coda_inode_cachep, ITOC(inode));
59}
60
Christoph Lametere18b8902006-12-06 20:33:20 -080061static void init_once(void * foo, struct kmem_cache * cachep, unsigned long flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
63 struct coda_inode_info *ei = (struct coda_inode_info *) foo;
64
Christoph Lametera35afb82007-05-16 22:10:57 -070065 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070066}
67
68int coda_init_inodecache(void)
69{
70 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
71 sizeof(struct coda_inode_info),
Paul Jackson4b6a9312006-03-24 03:16:05 -080072 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
Linus Torvalds1da177e2005-04-16 15:20:36 -070073 init_once, NULL);
74 if (coda_inode_cachep == NULL)
75 return -ENOMEM;
76 return 0;
77}
78
79void coda_destroy_inodecache(void)
80{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -070081 kmem_cache_destroy(coda_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082}
83
84static int coda_remount(struct super_block *sb, int *flags, char *data)
85{
86 *flags |= MS_NODIRATIME;
87 return 0;
88}
89
90/* exported operations */
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -080091static const struct super_operations coda_super_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070092{
93 .alloc_inode = coda_alloc_inode,
94 .destroy_inode = coda_destroy_inode,
95 .clear_inode = coda_clear_inode,
96 .put_super = coda_put_super,
97 .statfs = coda_statfs,
98 .remount_fs = coda_remount,
99};
100
101static int get_device_index(struct coda_mount_data *data)
102{
103 struct file *file;
104 struct inode *inode;
105 int idx;
106
107 if(data == NULL) {
108 printk("coda_read_super: Bad mount data\n");
109 return -1;
110 }
111
112 if(data->version != CODA_MOUNT_VERSION) {
113 printk("coda_read_super: Bad mount version\n");
114 return -1;
115 }
116
117 file = fget(data->fd);
118 inode = NULL;
119 if(file)
Josef Sipekd4176d32006-12-08 02:36:56 -0800120 inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121
122 if(!inode || !S_ISCHR(inode->i_mode) ||
123 imajor(inode) != CODA_PSDEV_MAJOR) {
124 if(file)
125 fput(file);
126
127 printk("coda_read_super: Bad file\n");
128 return -1;
129 }
130
131 idx = iminor(inode);
132 fput(file);
133
134 if(idx < 0 || idx >= MAX_CODADEVS) {
135 printk("coda_read_super: Bad minor number\n");
136 return -1;
137 }
138
139 return idx;
140}
141
142static int coda_fill_super(struct super_block *sb, void *data, int silent)
143{
144 struct inode *root = NULL;
145 struct coda_sb_info *sbi = NULL;
146 struct venus_comm *vc = NULL;
147 struct CodaFid fid;
148 int error;
149 int idx;
150
151 idx = get_device_index((struct coda_mount_data *) data);
152
153 /* Ignore errors in data, for backward compatibility */
154 if(idx == -1)
155 idx = 0;
156
157 printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
158
159 vc = &coda_comms[idx];
160 if (!vc->vc_inuse) {
161 printk("coda_read_super: No pseudo device\n");
162 return -EINVAL;
163 }
164
165 if ( vc->vc_sb ) {
166 printk("coda_read_super: Device already mounted\n");
167 return -EBUSY;
168 }
169
170 sbi = kmalloc(sizeof(struct coda_sb_info), GFP_KERNEL);
171 if(!sbi) {
172 return -ENOMEM;
173 }
174
175 vc->vc_sb = sb;
176
177 sbi->sbi_vcomm = vc;
178
179 sb->s_fs_info = sbi;
180 sb->s_flags |= MS_NODIRATIME; /* probably even noatime */
181 sb->s_blocksize = 1024; /* XXXXX what do we put here?? */
182 sb->s_blocksize_bits = 10;
183 sb->s_magic = CODA_SUPER_MAGIC;
184 sb->s_op = &coda_super_operations;
185
186 /* get root fid from Venus: this needs the root inode */
187 error = venus_rootfid(sb, &fid);
188 if ( error ) {
189 printk("coda_read_super: coda_get_rootfid failed with %d\n",
190 error);
191 goto error;
192 }
193 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
194
195 /* make root inode */
196 error = coda_cnode_make(&root, &fid, sb);
197 if ( error || !root ) {
198 printk("Failure of coda_cnode_make for root: error %d\n", error);
199 goto error;
200 }
201
202 printk("coda_read_super: rootinode is %ld dev %s\n",
203 root->i_ino, root->i_sb->s_id);
204 sb->s_root = d_alloc_root(root);
205 if (!sb->s_root)
206 goto error;
207 return 0;
208
209 error:
210 if (sbi) {
211 kfree(sbi);
212 if(vc)
213 vc->vc_sb = NULL;
214 }
215 if (root)
216 iput(root);
217
218 return -EINVAL;
219}
220
221static void coda_put_super(struct super_block *sb)
222{
223 struct coda_sb_info *sbi;
224
225 sbi = coda_sbp(sb);
226 sbi->sbi_vcomm->vc_sb = NULL;
227
228 printk("Coda: Bye bye.\n");
229 kfree(sbi);
230}
231
232static void coda_clear_inode(struct inode *inode)
233{
234 coda_cache_clear_inode(inode);
235}
236
237int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
238{
239 int err = coda_revalidate_inode(dentry);
240 if (!err)
241 generic_fillattr(dentry->d_inode, stat);
242 return err;
243}
244
245int coda_setattr(struct dentry *de, struct iattr *iattr)
246{
247 struct inode *inode = de->d_inode;
248 struct coda_vattr vattr;
249 int error;
250
251 lock_kernel();
252
253 memset(&vattr, 0, sizeof(vattr));
254
255 inode->i_ctime = CURRENT_TIME_SEC;
256 coda_iattr_to_vattr(iattr, &vattr);
257 vattr.va_type = C_VNON; /* cannot set type */
258
259 /* Venus is responsible for truncating the container-file!!! */
260 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
261
262 if ( !error ) {
263 coda_vattr_to_iattr(inode, &vattr);
264 coda_cache_clear_inode(inode);
265 }
266
267 unlock_kernel();
268
269 return error;
270}
271
Arjan van de Ven754661f2007-02-12 00:55:38 -0800272const struct inode_operations coda_file_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 .permission = coda_permission,
274 .getattr = coda_getattr,
275 .setattr = coda_setattr,
276};
277
David Howells726c3342006-06-23 02:02:58 -0700278static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279{
280 int error;
281
282 lock_kernel();
283
David Howells726c3342006-06-23 02:02:58 -0700284 error = venus_statfs(dentry, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285
286 unlock_kernel();
287
288 if (error) {
289 /* fake something like AFS does */
290 buf->f_blocks = 9000000;
291 buf->f_bfree = 9000000;
292 buf->f_bavail = 9000000;
293 buf->f_files = 9000000;
294 buf->f_ffree = 9000000;
295 }
296
297 /* and fill in the rest */
298 buf->f_type = CODA_SUPER_MAGIC;
299 buf->f_bsize = 1024;
300 buf->f_namelen = CODA_MAXNAMLEN;
301
302 return 0;
303}
304
305/* init_coda: used by filesystems.c to register coda */
306
David Howells454e2392006-06-23 02:02:57 -0700307static int coda_get_sb(struct file_system_type *fs_type,
308 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309{
David Howells454e2392006-06-23 02:02:57 -0700310 return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311}
312
313struct file_system_type coda_fs_type = {
314 .owner = THIS_MODULE,
315 .name = "coda",
316 .get_sb = coda_get_sb,
317 .kill_sb = kill_anon_super,
318 .fs_flags = FS_BINARY_MOUNTDATA,
319};
320