blob: 6058df380cc00ed0d4be8cb81a0a87369cb9aac3 [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>
Eric W. Biederman9fd973e2013-01-30 18:50:54 -080023#include <linux/pid_namespace.h>
Fabian Frederick834b46c2014-08-08 14:20:33 -070024#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/fs.h>
26#include <linux/vmalloc.h>
27
28#include <linux/coda.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#include <linux/coda_psdev.h>
Al Viro31a203d2011-01-12 16:36:09 -050030#include "coda_linux.h"
31#include "coda_cache.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070032
Adrian Bunkc98d8cf2006-03-24 03:15:53 -080033#include "coda_int.h"
34
Linus Torvalds1da177e2005-04-16 15:20:36 -070035/* VFS super_block ops */
Al Virob57922d2010-06-07 14:34:48 -040036static void coda_evict_inode(struct inode *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037static void coda_put_super(struct super_block *);
David Howells726c3342006-06-23 02:02:58 -070038static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Christoph Lametere18b8902006-12-06 20:33:20 -080040static struct kmem_cache * coda_inode_cachep;
Linus Torvalds1da177e2005-04-16 15:20:36 -070041
42static struct inode *coda_alloc_inode(struct super_block *sb)
43{
44 struct coda_inode_info *ei;
Jesper Juhl747feca2010-12-09 23:25:09 +010045 ei = kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046 if (!ei)
47 return NULL;
48 memset(&ei->c_fid, 0, sizeof(struct CodaFid));
49 ei->c_flags = 0;
Eric W. Biederman17499e32013-01-30 19:36:06 -080050 ei->c_uid = GLOBAL_ROOT_UID;
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 ei->c_cached_perm = 0;
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -040052 spin_lock_init(&ei->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 return &ei->vfs_inode;
54}
55
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110056static void coda_i_callback(struct rcu_head *head)
57{
58 struct inode *inode = container_of(head, struct inode, i_rcu);
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110059 kmem_cache_free(coda_inode_cachep, ITOC(inode));
60}
61
Linus Torvalds1da177e2005-04-16 15:20:36 -070062static void coda_destroy_inode(struct inode *inode)
63{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +110064 call_rcu(&inode->i_rcu, coda_i_callback);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065}
66
Alexey Dobriyan51cc5062008-07-25 19:45:34 -070067static void init_once(void *foo)
Linus Torvalds1da177e2005-04-16 15:20:36 -070068{
69 struct coda_inode_info *ei = (struct coda_inode_info *) foo;
70
Christoph Lametera35afb82007-05-16 22:10:57 -070071 inode_init_once(&ei->vfs_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072}
Paul Mundt20c2df82007-07-20 10:11:58 +090073
Fabian Frederick5f356fd2014-04-03 14:50:24 -070074int __init coda_init_inodecache(void)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075{
76 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
Vladimir Davydov5d097052016-01-14 15:18:21 -080077 sizeof(struct coda_inode_info), 0,
78 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
79 SLAB_ACCOUNT, init_once);
Linus Torvalds1da177e2005-04-16 15:20:36 -070080 if (coda_inode_cachep == NULL)
81 return -ENOMEM;
82 return 0;
83}
84
85void coda_destroy_inodecache(void)
86{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +100087 /*
88 * Make sure all delayed rcu free inodes are flushed before we
89 * destroy cache.
90 */
91 rcu_barrier();
Alexey Dobriyan1a1d92c2006-09-27 01:49:40 -070092 kmem_cache_destroy(coda_inode_cachep);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093}
94
95static int coda_remount(struct super_block *sb, int *flags, char *data)
96{
Theodore Ts'o02b99842014-03-13 10:14:33 -040097 sync_filesystem(sb);
Jan Harkesfac1f0e2007-07-19 01:48:44 -070098 *flags |= MS_NOATIME;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 return 0;
100}
101
102/* exported operations */
Josef 'Jeff' Sipekee9b6d62007-02-12 00:55:41 -0800103static const struct super_operations coda_super_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104{
105 .alloc_inode = coda_alloc_inode,
106 .destroy_inode = coda_destroy_inode,
Al Virob57922d2010-06-07 14:34:48 -0400107 .evict_inode = coda_evict_inode,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 .put_super = coda_put_super,
109 .statfs = coda_statfs,
110 .remount_fs = coda_remount,
111};
112
113static int get_device_index(struct coda_mount_data *data)
114{
Al Viro2903ff02012-08-28 12:52:22 -0400115 struct fd f;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 struct inode *inode;
Al Viro2903ff02012-08-28 12:52:22 -0400117 int idx;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Al Viro78f7d752012-08-27 12:54:13 -0400119 if (data == NULL) {
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700120 pr_warn("%s: Bad mount data\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 return -1;
122 }
123
Al Viro78f7d752012-08-27 12:54:13 -0400124 if (data->version != CODA_MOUNT_VERSION) {
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700125 pr_warn("%s: Bad mount version\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126 return -1;
127 }
128
Al Viro2903ff02012-08-28 12:52:22 -0400129 f = fdget(data->fd);
130 if (!f.file)
Al Viro78f7d752012-08-27 12:54:13 -0400131 goto Ebadf;
Al Viro496ad9a2013-01-23 17:07:38 -0500132 inode = file_inode(f.file);
Al Viro78f7d752012-08-27 12:54:13 -0400133 if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
Al Viro2903ff02012-08-28 12:52:22 -0400134 fdput(f);
Al Viro78f7d752012-08-27 12:54:13 -0400135 goto Ebadf;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 }
137
138 idx = iminor(inode);
Al Viro2903ff02012-08-28 12:52:22 -0400139 fdput(f);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
Al Viro78f7d752012-08-27 12:54:13 -0400141 if (idx < 0 || idx >= MAX_CODADEVS) {
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700142 pr_warn("%s: Bad minor number\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 return -1;
144 }
145
146 return idx;
Al Viro78f7d752012-08-27 12:54:13 -0400147Ebadf:
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700148 pr_warn("%s: Bad file\n", __func__);
Al Viro78f7d752012-08-27 12:54:13 -0400149 return -1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150}
151
152static int coda_fill_super(struct super_block *sb, void *data, int silent)
153{
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700154 struct inode *root = NULL;
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400155 struct venus_comm *vc;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 struct CodaFid fid;
Jan Harkesa1b0aa82007-07-19 01:48:50 -0700157 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 int idx;
159
Eric W. Biederman9fd973e2013-01-30 18:50:54 -0800160 if (task_active_pid_ns(current) != &init_pid_ns)
161 return -EINVAL;
162
Linus Torvalds1da177e2005-04-16 15:20:36 -0700163 idx = get_device_index((struct coda_mount_data *) data);
164
165 /* Ignore errors in data, for backward compatibility */
166 if(idx == -1)
167 idx = 0;
168
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700169 pr_info("%s: device index: %i\n", __func__, idx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170
171 vc = &coda_comms[idx];
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400172 mutex_lock(&vc->vc_mutex);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400173
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174 if (!vc->vc_inuse) {
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700175 pr_warn("%s: No pseudo device\n", __func__);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400176 error = -EINVAL;
177 goto unlock_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 }
179
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400180 if (vc->vc_sb) {
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700181 pr_warn("%s: Device already mounted\n", __func__);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400182 error = -EBUSY;
183 goto unlock_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184 }
185
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;
Jan Karaa5695a72017-04-12 12:24:38 +0200196
197 error = super_setup_bdi(sb);
198 if (error)
199 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
201 /* get root fid from Venus: this needs the root inode */
202 error = venus_rootfid(sb, &fid);
203 if ( error ) {
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700204 pr_warn("%s: coda_get_rootfid failed with %d\n",
205 __func__, error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 goto error;
207 }
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700208 pr_info("%s: rootfid is %s\n", __func__, coda_f2s(&fid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210 /* make root inode */
Al Virof4947fb2012-01-10 11:11:49 -0500211 root = coda_cnode_make(&fid, sb);
212 if (IS_ERR(root)) {
213 error = PTR_ERR(root);
Fabian Frederickd9b4b312014-06-06 14:36:18 -0700214 pr_warn("Failure of coda_cnode_make for root: error %d\n",
215 error);
Al Virof4947fb2012-01-10 11:11:49 -0500216 goto error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 }
218
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700219 pr_info("%s: rootinode is %ld dev %s\n",
220 __func__, root->i_ino, root->i_sb->s_id);
Al Viro48fde702012-01-08 22:15:13 -0500221 sb->s_root = d_make_root(root);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400222 if (!sb->s_root) {
223 error = -EINVAL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224 goto error;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400225 }
Jan Blunckdb719222010-08-15 22:51:10 +0200226 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400228error:
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400229 mutex_lock(&vc->vc_mutex);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400230 vc->vc_sb = NULL;
231 sb->s_fs_info = NULL;
232unlock_out:
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400233 mutex_unlock(&vc->vc_mutex);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400234 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235}
236
237static void coda_put_super(struct super_block *sb)
238{
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400239 struct venus_comm *vcp = coda_vcp(sb);
240 mutex_lock(&vcp->vc_mutex);
Yoshihisa Abeda47c192010-10-25 02:03:46 -0400241 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
Fabian Frederickf38cfb22014-06-06 14:36:19 -0700245 pr_info("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{
Johannes Weiner91b0abe2014-04-03 14:47:49 -0700250 truncate_inode_pages_final(&inode->i_data);
Jan Karadbd57682012-05-03 14:48:02 +0200251 clear_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 coda_cache_clear_inode(inode);
253}
254
David Howellsa528d352017-01-31 16:46:22 +0000255int coda_getattr(const struct path *path, struct kstat *stat,
256 u32 request_mask, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257{
David Howellsa528d352017-01-31 16:46:22 +0000258 int err = coda_revalidate_inode(d_inode(path->dentry));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 if (!err)
David Howellsa528d352017-01-31 16:46:22 +0000260 generic_fillattr(d_inode(path->dentry), stat);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700261 return err;
262}
263
264int coda_setattr(struct dentry *de, struct iattr *iattr)
265{
David Howells2b0143b2015-03-17 22:25:59 +0000266 struct inode *inode = d_inode(de);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 struct coda_vattr vattr;
268 int error;
269
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 memset(&vattr, 0, sizeof(vattr));
271
Deepa Dinamani02027d42016-09-14 07:48:05 -0700272 inode->i_ctime = current_time(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 coda_iattr_to_vattr(iattr, &vattr);
274 vattr.va_type = C_VNON; /* cannot set type */
275
276 /* Venus is responsible for truncating the container-file!!! */
277 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
278
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400279 if (!error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 coda_vattr_to_iattr(inode, &vattr);
281 coda_cache_clear_inode(inode);
282 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 return error;
284}
285
Arjan van de Ven754661f2007-02-12 00:55:38 -0800286const struct inode_operations coda_file_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 .permission = coda_permission,
288 .getattr = coda_getattr,
289 .setattr = coda_setattr,
290};
291
David Howells726c3342006-06-23 02:02:58 -0700292static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293{
294 int error;
295
David Howells726c3342006-06-23 02:02:58 -0700296 error = venus_statfs(dentry, buf);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 if (error) {
299 /* fake something like AFS does */
300 buf->f_blocks = 9000000;
301 buf->f_bfree = 9000000;
302 buf->f_bavail = 9000000;
303 buf->f_files = 9000000;
304 buf->f_ffree = 9000000;
305 }
306
307 /* and fill in the rest */
308 buf->f_type = CODA_SUPER_MAGIC;
Jan Harkesfac1f0e2007-07-19 01:48:44 -0700309 buf->f_bsize = 4096;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 buf->f_namelen = CODA_MAXNAMLEN;
311
312 return 0;
313}
314
315/* init_coda: used by filesystems.c to register coda */
316
Al Viro3c26ff62010-07-25 11:46:36 +0400317static struct dentry *coda_mount(struct file_system_type *fs_type,
318 int flags, const char *dev_name, void *data)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319{
Al Viro3c26ff62010-07-25 11:46:36 +0400320 return mount_nodev(fs_type, flags, data, coda_fill_super);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321}
322
323struct file_system_type coda_fs_type = {
324 .owner = THIS_MODULE,
325 .name = "coda",
Al Viro3c26ff62010-07-25 11:46:36 +0400326 .mount = coda_mount,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 .kill_sb = kill_anon_super,
328 .fs_flags = FS_BINARY_MOUNTDATA,
329};
Eric W. Biederman7f78e032013-03-02 19:39:14 -0800330MODULE_ALIAS_FS("coda");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331