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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>
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>
Eric W. Biederman9fd973e2013-01-30 18:50:54 -080023#include <linux/pid_namespace.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#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;
Eric W. Biederman17499e32013-01-30 19:36:06 -080052 ei->c_uid = GLOBAL_ROOT_UID;
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 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 Pigginfa0d7e3d2011-01-07 17:49:49 +110058static void coda_i_callback(struct rcu_head *head)
59{
60 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110061 kmem_cache_free(coda_inode_cachep, ITOC(inode));
62}
63
Linus Torvalds1da177e2005-04-16 15:20:36 -070064static void coda_destroy_inode(struct inode *inode)
65{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110066 call_rcu(&inode->i_rcu, coda_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -070067}
68
Alexey Dobriyan51cc5062008-07-25 19:45:34 -070069static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
71 struct coda_inode_info *ei = (struct coda_inode_info *) foo;
72
Christoph Lametera35afb82007-05-16 22:10:57 -070073 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070074}
Paul Mundt20c2df82007-07-20 10:11:58 +090075
Linus Torvalds1da177e2005-04-16 15:20:36 -070076int coda_init_inodecache(void)
77{
78 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
79 sizeof(struct coda_inode_info),
Paul Jackson4b6a9312006-03-24 03:16:05 -080080 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
Paul Mundt20c2df82007-07-20 10:11:58 +090081 init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -070082 if (coda_inode_cachep == NULL)
83 return -ENOMEM;
84 return 0;
85}
86
87void coda_destroy_inodecache(void)
88{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +100089 /*
90 * Make sure all delayed rcu free inodes are flushed before we
91 * destroy cache.
92 */
93 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -070094 kmem_cache_destroy(coda_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -070095}
96
97static int coda_remount(struct super_block *sb, int *flags, char *data)
98{
Jan Harkesfac1f0e2007-07-19 01:48:44 -070099 *flags |= MS_NOATIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 return 0;
101}
102
103/* exported operations */
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800104static const struct super_operations coda_super_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105{
106 .alloc_inode = coda_alloc_inode,
107 .destroy_inode = coda_destroy_inode,
Al Virob57922d2010-06-07 14:34:48 -0400108 .evict_inode = coda_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109 .put_super = coda_put_super,
110 .statfs = coda_statfs,
111 .remount_fs = coda_remount,
112};
113
114static int get_device_index(struct coda_mount_data *data)
115{
Al Viro2903ff02012-08-28 12:52:22 -0400116 struct fd f;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 struct inode *inode;
Al Viro2903ff02012-08-28 12:52:22 -0400118 int idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119
Al Viro78f7d752012-08-27 12:54:13 -0400120 if (data == NULL) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 printk("coda_read_super: Bad mount data\n");
122 return -1;
123 }
124
Al Viro78f7d752012-08-27 12:54:13 -0400125 if (data->version != CODA_MOUNT_VERSION) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 printk("coda_read_super: Bad mount version\n");
127 return -1;
128 }
129
Al Viro2903ff02012-08-28 12:52:22 -0400130 f = fdget(data->fd);
131 if (!f.file)
Al Viro78f7d752012-08-27 12:54:13 -0400132 goto Ebadf;
Al Viro496ad9a2013-01-23 17:07:38 -0500133 inode = file_inode(f.file);
Al Viro78f7d752012-08-27 12:54:13 -0400134 if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
Al Viro2903ff02012-08-28 12:52:22 -0400135 fdput(f);
Al Viro78f7d752012-08-27 12:54:13 -0400136 goto Ebadf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 }
138
139 idx = iminor(inode);
Al Viro2903ff02012-08-28 12:52:22 -0400140 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
Al Viro78f7d752012-08-27 12:54:13 -0400142 if (idx < 0 || idx >= MAX_CODADEVS) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 printk("coda_read_super: Bad minor number\n");
144 return -1;
145 }
146
147 return idx;
Al Viro78f7d752012-08-27 12:54:13 -0400148Ebadf:
149 printk("coda_read_super: Bad file\n");
150 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151}
152
153static int coda_fill_super(struct super_block *sb, void *data, int silent)
154{
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700155 struct inode *root = NULL;
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400156 struct venus_comm *vc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700157 struct CodaFid fid;
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700158 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 int idx;
160
Eric W. Biederman9fd973e2013-01-30 18:50:54 -0800161 if (task_active_pid_ns(current) != &init_pid_ns)
162 return -EINVAL;
163
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 idx = get_device_index((struct coda_mount_data *) data);
165
166 /* Ignore errors in data, for backward compatibility */
167 if(idx == -1)
168 idx = 0;
169
170 printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
171
172 vc = &coda_comms[idx];
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400173 mutex_lock(&vc->vc_mutex);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 if (!vc->vc_inuse) {
176 printk("coda_read_super: No pseudo device\n");
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400177 error = -EINVAL;
178 goto unlock_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 }
180
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400181 if (vc->vc_sb) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182 printk("coda_read_super: Device already mounted\n");
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400183 error = -EBUSY;
184 goto unlock_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 }
186
Jens Axboe5163d902010-04-22 12:12:40 +0200187 error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
188 if (error)
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400189 goto unlock_out;
Jens Axboe5163d902010-04-22 12:12:40 +0200190
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 vc->vc_sb = sb;
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400192 mutex_unlock(&vc->vc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700194 sb->s_fs_info = vc;
Jan Harkesfac1f0e2007-07-19 01:48:44 -0700195 sb->s_flags |= MS_NOATIME;
196 sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
197 sb->s_blocksize_bits = 12;
198 sb->s_magic = CODA_SUPER_MAGIC;
199 sb->s_op = &coda_super_operations;
Al Viro9501e4c2011-01-12 16:25:02 -0500200 sb->s_d_op = &coda_dentry_operations;
Jens Axboe5163d902010-04-22 12:12:40 +0200201 sb->s_bdi = &vc->bdi;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
203 /* get root fid from Venus: this needs the root inode */
204 error = venus_rootfid(sb, &fid);
205 if ( error ) {
206 printk("coda_read_super: coda_get_rootfid failed with %d\n",
207 error);
208 goto error;
209 }
210 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
211
212 /* make root inode */
Al Virof4947fb2012-01-10 11:11:49 -0500213 root = coda_cnode_make(&fid, sb);
214 if (IS_ERR(root)) {
215 error = PTR_ERR(root);
216 printk("Failure of coda_cnode_make for root: error %d\n", error);
Al Virof4947fb2012-01-10 11:11:49 -0500217 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 }
219
220 printk("coda_read_super: rootinode is %ld dev %s\n",
221 root->i_ino, root->i_sb->s_id);
Al Viro48fde702012-01-08 22:15:13 -0500222 sb->s_root = d_make_root(root);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400223 if (!sb->s_root) {
224 error = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 goto error;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400226 }
Jan Blunckdb719222010-08-15 22:51:10 +0200227 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400229error:
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400230 mutex_lock(&vc->vc_mutex);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400231 bdi_destroy(&vc->bdi);
232 vc->vc_sb = NULL;
233 sb->s_fs_info = NULL;
234unlock_out:
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400235 mutex_unlock(&vc->vc_mutex);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400236 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237}
238
239static void coda_put_super(struct super_block *sb)
240{
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400241 struct venus_comm *vcp = coda_vcp(sb);
242 mutex_lock(&vcp->vc_mutex);
243 bdi_destroy(&vcp->bdi);
244 vcp->vc_sb = NULL;
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700245 sb->s_fs_info = NULL;
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400246 mutex_unlock(&vcp->vc_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247
248 printk("Coda: Bye bye.\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249}
250
Al Virob57922d2010-06-07 14:34:48 -0400251static void coda_evict_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252{
Al Virob57922d2010-06-07 14:34:48 -0400253 truncate_inode_pages(&inode->i_data, 0);
Jan Karadbd57682012-05-03 14:48:02 +0200254 clear_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 coda_cache_clear_inode(inode);
256}
257
258int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
259{
260 int err = coda_revalidate_inode(dentry);
261 if (!err)
262 generic_fillattr(dentry->d_inode, stat);
263 return err;
264}
265
266int coda_setattr(struct dentry *de, struct iattr *iattr)
267{
268 struct inode *inode = de->d_inode;
269 struct coda_vattr vattr;
270 int error;
271
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 memset(&vattr, 0, sizeof(vattr));
273
274 inode->i_ctime = CURRENT_TIME_SEC;
275 coda_iattr_to_vattr(iattr, &vattr);
276 vattr.va_type = C_VNON; /* cannot set type */
277
278 /* Venus is responsible for truncating the container-file!!! */
279 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
280
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400281 if (!error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 coda_vattr_to_iattr(inode, &vattr);
283 coda_cache_clear_inode(inode);
284 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 return error;
286}
287
Arjan van de Ven754661f2007-02-12 00:55:38 -0800288const struct inode_operations coda_file_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 .permission = coda_permission,
290 .getattr = coda_getattr,
291 .setattr = coda_setattr,
292};
293
David Howells726c3342006-06-23 02:02:58 -0700294static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295{
296 int error;
297
David Howells726c3342006-06-23 02:02:58 -0700298 error = venus_statfs(dentry, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 if (error) {
301 /* fake something like AFS does */
302 buf->f_blocks = 9000000;
303 buf->f_bfree = 9000000;
304 buf->f_bavail = 9000000;
305 buf->f_files = 9000000;
306 buf->f_ffree = 9000000;
307 }
308
309 /* and fill in the rest */
310 buf->f_type = CODA_SUPER_MAGIC;
Jan Harkesfac1f0e2007-07-19 01:48:44 -0700311 buf->f_bsize = 4096;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 buf->f_namelen = CODA_MAXNAMLEN;
313
314 return 0;
315}
316
317/* init_coda: used by filesystems.c to register coda */
318
Al Viro3c26ff62010-07-25 11:46:36 +0400319static struct dentry *coda_mount(struct file_system_type *fs_type,
320 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321{
Al Viro3c26ff62010-07-25 11:46:36 +0400322 return mount_nodev(fs_type, flags, data, coda_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323}
324
325struct file_system_type coda_fs_type = {
326 .owner = THIS_MODULE,
327 .name = "coda",
Al Viro3c26ff62010-07-25 11:46:36 +0400328 .mount = coda_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329 .kill_sb = kill_anon_super,
330 .fs_flags = FS_BINARY_MOUNTDATA,
331};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800332MODULE_ALIAS_FS("coda");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333