blob: 871b27715465fb6c21d408354b478a9a0a318a87 [file] [log] [blame]
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>
Yoshihisa Abeda47c192010-10-25 02:03:46 -040018#include <linux/mutex.h>
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -040019#include <linux/spinlock.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/file.h>
21#include <linux/vfs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090022#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070031#include <linux/coda_psdev.h>
Al Viro31a203d2011-01-12 16:36:09 -050032#include "coda_linux.h"
33#include "coda_cache.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070034
Adrian Bunkc98d8cf2006-03-24 03:15:53 -080035#include "coda_int.h"
36
Linus Torvalds1da177e2005-04-16 15:20:36 -070037/* VFS super_block ops */
Al Virob57922d2010-06-07 14:34:48 -040038static void coda_evict_inode(struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039static void coda_put_super(struct super_block *);
David Howells726c3342006-06-23 02:02:58 -070040static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
Christoph Lametere18b8902006-12-06 20:33:20 -080042static struct kmem_cache * coda_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070043
44static struct inode *coda_alloc_inode(struct super_block *sb)
45{
46 struct coda_inode_info *ei;
Jesper Juhl747feca2010-12-09 23:25:09 +010047 ei = kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070048 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;
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -040054 spin_lock_init(&ei->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055 return &ei->vfs_inode;
56}
57
Nick Pigginfa0d7e32011-01-07 17:49:49 +110058static 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070065static void coda_destroy_inode(struct inode *inode)
66{
Nick Pigginfa0d7e32011-01-07 17:49:49 +110067 call_rcu(&inode->i_rcu, coda_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -070068}
69
Alexey Dobriyan51cc5062008-07-25 19:45:34 -070070static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -070071{
72 struct coda_inode_info *ei = (struct coda_inode_info *) foo;
73
Christoph Lametera35afb82007-05-16 22:10:57 -070074 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070075}
Paul Mundt20c2df82007-07-20 10:11:58 +090076
Linus Torvalds1da177e2005-04-16 15:20:36 -070077int coda_init_inodecache(void)
78{
79 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
80 sizeof(struct coda_inode_info),
Paul Jackson4b6a9312006-03-24 03:16:05 -080081 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
Paul Mundt20c2df82007-07-20 10:11:58 +090082 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 if (coda_inode_cachep == NULL)
84 return -ENOMEM;
85 return 0;
86}
87
88void coda_destroy_inodecache(void)
89{
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -070090 kmem_cache_destroy(coda_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091}
92
93static int coda_remount(struct super_block *sb, int *flags, char *data)
94{
Jan Harkesfac1f0e2007-07-19 01:48:44 -070095 *flags |= MS_NOATIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 return 0;
97}
98
99/* exported operations */
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800100static const struct super_operations coda_super_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101{
102 .alloc_inode = coda_alloc_inode,
103 .destroy_inode = coda_destroy_inode,
Al Virob57922d2010-06-07 14:34:48 -0400104 .evict_inode = coda_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 .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)
Josef Sipekd4176d32006-12-08 02:36:56 -0800129 inode = file->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
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{
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700153 struct inode *root = NULL;
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400154 struct venus_comm *vc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 struct CodaFid fid;
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700156 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 int idx;
158
159 idx = get_device_index((struct coda_mount_data *) data);
160
161 /* Ignore errors in data, for backward compatibility */
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];
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400168 mutex_lock(&vc->vc_mutex);
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400169
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 if (!vc->vc_inuse) {
171 printk("coda_read_super: No pseudo device\n");
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400172 error = -EINVAL;
173 goto unlock_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 }
175
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400176 if (vc->vc_sb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 printk("coda_read_super: Device already mounted\n");
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400178 error = -EBUSY;
179 goto unlock_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180 }
181
Jens Axboe5163d902010-04-22 12:12:40 +0200182 error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
183 if (error)
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400184 goto unlock_out;
Jens Axboe5163d902010-04-22 12:12:40 +0200185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 vc->vc_sb = sb;
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400187 mutex_unlock(&vc->vc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700189 sb->s_fs_info = vc;
Jan Harkesfac1f0e2007-07-19 01:48:44 -0700190 sb->s_flags |= MS_NOATIME;
191 sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
192 sb->s_blocksize_bits = 12;
193 sb->s_magic = CODA_SUPER_MAGIC;
194 sb->s_op = &coda_super_operations;
Al Viro9501e4c2011-01-12 16:25:02 -0500195 sb->s_d_op = &coda_dentry_operations;
Jens Axboe5163d902010-04-22 12:12:40 +0200196 sb->s_bdi = &vc->bdi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
198 /* get root fid from Venus: this needs the root inode */
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 /* make root inode */
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);
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400217 if (!sb->s_root) {
218 error = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 goto error;
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400220 }
Jan Blunckdb719222010-08-15 22:51:10 +0200221 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400223error:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 if (root)
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700225 iput(root);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400227 mutex_lock(&vc->vc_mutex);
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400228 bdi_destroy(&vc->bdi);
229 vc->vc_sb = NULL;
230 sb->s_fs_info = NULL;
231unlock_out:
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400232 mutex_unlock(&vc->vc_mutex);
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400233 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234}
235
236static void coda_put_super(struct super_block *sb)
237{
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400238 struct venus_comm *vcp = coda_vcp(sb);
239 mutex_lock(&vcp->vc_mutex);
240 bdi_destroy(&vcp->bdi);
241 vcp->vc_sb = NULL;
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700242 sb->s_fs_info = NULL;
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400243 mutex_unlock(&vcp->vc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
245 printk("Coda: Bye bye.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246}
247
Al Virob57922d2010-06-07 14:34:48 -0400248static void coda_evict_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
Al Virob57922d2010-06-07 14:34:48 -0400250 truncate_inode_pages(&inode->i_data, 0);
251 end_writeback(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 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
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 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; /* cannot set type */
274
275 /* Venus is responsible for truncating the container-file!!! */
276 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
277
Yoshihisa Abef7cc02b2010-10-25 02:03:45 -0400278 if (!error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 coda_vattr_to_iattr(inode, &vattr);
280 coda_cache_clear_inode(inode);
281 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 return error;
283}
284
Arjan van de Ven754661f2007-02-12 00:55:38 -0800285const struct inode_operations coda_file_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 .permission = coda_permission,
287 .getattr = coda_getattr,
288 .setattr = coda_setattr,
289};
290
David Howells726c3342006-06-23 02:02:58 -0700291static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292{
293 int error;
294
David Howells726c3342006-06-23 02:02:58 -0700295 error = venus_statfs(dentry, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 if (error) {
298 /* fake something like AFS does */
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 /* and fill in the rest */
307 buf->f_type = CODA_SUPER_MAGIC;
Jan Harkesfac1f0e2007-07-19 01:48:44 -0700308 buf->f_bsize = 4096;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309 buf->f_namelen = CODA_MAXNAMLEN;
310
311 return 0;
312}
313
314/* init_coda: used by filesystems.c to register coda */
315
Al Viro3c26ff62010-07-25 11:46:36 +0400316static struct dentry *coda_mount(struct file_system_type *fs_type,
317 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318{
Al Viro3c26ff62010-07-25 11:46:36 +0400319 return mount_nodev(fs_type, flags, data, coda_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320}
321
322struct file_system_type coda_fs_type = {
323 .owner = THIS_MODULE,
324 .name = "coda",
Al Viro3c26ff62010-07-25 11:46:36 +0400325 .mount = coda_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 .kill_sb = kill_anon_super,
327 .fs_flags = FS_BINARY_MOUNTDATA,
328};
329