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1/*
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/mutex.h>
19#include <linux/spinlock.h>
20#include <linux/file.h>
21#include <linux/vfs.h>
22#include <linux/slab.h>
23
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>
31#include <linux/coda_psdev.h>
32#include "coda_linux.h"
33#include "coda_cache.h"
34
35#include "coda_int.h"
36
37/* VFS super_block ops */
38static void coda_evict_inode(struct inode *);
39static void coda_put_super(struct super_block *);
40static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);
41
42static struct kmem_cache * coda_inode_cachep;
43
44static struct inode *coda_alloc_inode(struct super_block *sb)
45{
46 struct coda_inode_info *ei;
47 ei = kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
48 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;
54 spin_lock_init(&ei->c_lock);
55 return &ei->vfs_inode;
56}
57
58static 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
65static void coda_destroy_inode(struct inode *inode)
66{
67 call_rcu(&inode->i_rcu, coda_i_callback);
68}
69
70static void init_once(void *foo)
71{
72 struct coda_inode_info *ei = (struct coda_inode_info *) foo;
73
74 inode_init_once(&ei->vfs_inode);
75}
76
77int coda_init_inodecache(void)
78{
79 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
80 sizeof(struct coda_inode_info),
81 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
82 init_once);
83 if (coda_inode_cachep == NULL)
84 return -ENOMEM;
85 return 0;
86}
87
88void coda_destroy_inodecache(void)
89{
90 kmem_cache_destroy(coda_inode_cachep);
91}
92
93static int coda_remount(struct super_block *sb, int *flags, char *data)
94{
95 *flags |= MS_NOATIME;
96 return 0;
97}
98
99/* exported operations */
100static const struct super_operations coda_super_operations =
101{
102 .alloc_inode = coda_alloc_inode,
103 .destroy_inode = coda_destroy_inode,
104 .evict_inode = coda_evict_inode,
105 .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)
129 inode = file->f_path.dentry->d_inode;
130
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{
153 struct inode *root = NULL;
154 struct venus_comm *vc;
155 struct CodaFid fid;
156 int error;
157 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];
168 mutex_lock(&vc->vc_mutex);
169
170 if (!vc->vc_inuse) {
171 printk("coda_read_super: No pseudo device\n");
172 error = -EINVAL;
173 goto unlock_out;
174 }
175
176 if (vc->vc_sb) {
177 printk("coda_read_super: Device already mounted\n");
178 error = -EBUSY;
179 goto unlock_out;
180 }
181
182 error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
183 if (error)
184 goto unlock_out;
185
186 vc->vc_sb = sb;
187 mutex_unlock(&vc->vc_mutex);
188
189 sb->s_fs_info = vc;
190 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;
195 sb->s_d_op = &coda_dentry_operations;
196 sb->s_bdi = &vc->bdi;
197
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);
217 if (!sb->s_root) {
218 error = -EINVAL;
219 goto error;
220 }
221 return 0;
222
223error:
224 if (root)
225 iput(root);
226
227 mutex_lock(&vc->vc_mutex);
228 bdi_destroy(&vc->bdi);
229 vc->vc_sb = NULL;
230 sb->s_fs_info = NULL;
231unlock_out:
232 mutex_unlock(&vc->vc_mutex);
233 return error;
234}
235
236static void coda_put_super(struct super_block *sb)
237{
238 struct venus_comm *vcp = coda_vcp(sb);
239 mutex_lock(&vcp->vc_mutex);
240 bdi_destroy(&vcp->bdi);
241 vcp->vc_sb = NULL;
242 sb->s_fs_info = NULL;
243 mutex_unlock(&vcp->vc_mutex);
244
245 printk("Coda: Bye bye.\n");
246}
247
248static void coda_evict_inode(struct inode *inode)
249{
250 truncate_inode_pages(&inode->i_data, 0);
251 end_writeback(inode);
252 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
269 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
278 if (!error) {
279 coda_vattr_to_iattr(inode, &vattr);
280 coda_cache_clear_inode(inode);
281 }
282 return error;
283}
284
285const struct inode_operations coda_file_inode_operations = {
286 .permission = coda_permission,
287 .getattr = coda_getattr,
288 .setattr = coda_setattr,
289};
290
291static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
292{
293 int error;
294
295 error = venus_statfs(dentry, buf);
296
297 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;
308 buf->f_bsize = 4096;
309 buf->f_namelen = CODA_MAXNAMLEN;
310
311 return 0;
312}
313
314/* init_coda: used by filesystems.c to register coda */
315
316static struct dentry *coda_mount(struct file_system_type *fs_type,
317 int flags, const char *dev_name, void *data)
318{
319 return mount_nodev(fs_type, flags, data, coda_fill_super);
320}
321
322struct file_system_type coda_fs_type = {
323 .owner = THIS_MODULE,
324 .name = "coda",
325 .mount = coda_mount,
326 .kill_sb = kill_anon_super,
327 .fs_flags = FS_BINARY_MOUNTDATA,
328};
329
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * Super block/filesystem wide operations
4 *
5 * Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and
6 * Michael Callahan <callahan@maths.ox.ac.uk>
7 *
8 * Rewritten for Linux 2.1. Peter Braam <braam@cs.cmu.edu>
9 * Copyright (C) Carnegie Mellon University
10 */
11
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 <linux/coda_psdev.h>
31#include "coda_linux.h"
32#include "coda_cache.h"
33
34#include "coda_int.h"
35
36/* VFS super_block ops */
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_i_callback(struct rcu_head *head)
58{
59 struct inode *inode = container_of(head, struct inode, i_rcu);
60 kmem_cache_free(coda_inode_cachep, ITOC(inode));
61}
62
63static void coda_destroy_inode(struct inode *inode)
64{
65 call_rcu(&inode->i_rcu, coda_i_callback);
66}
67
68static void init_once(void *foo)
69{
70 struct coda_inode_info *ei = (struct coda_inode_info *) foo;
71
72 inode_init_once(&ei->vfs_inode);
73}
74
75int __init coda_init_inodecache(void)
76{
77 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
78 sizeof(struct coda_inode_info), 0,
79 SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD|
80 SLAB_ACCOUNT, init_once);
81 if (coda_inode_cachep == NULL)
82 return -ENOMEM;
83 return 0;
84}
85
86void coda_destroy_inodecache(void)
87{
88 /*
89 * Make sure all delayed rcu free inodes are flushed before we
90 * destroy cache.
91 */
92 rcu_barrier();
93 kmem_cache_destroy(coda_inode_cachep);
94}
95
96static int coda_remount(struct super_block *sb, int *flags, char *data)
97{
98 sync_filesystem(sb);
99 *flags |= SB_NOATIME;
100 return 0;
101}
102
103/* exported operations */
104static const struct super_operations coda_super_operations =
105{
106 .alloc_inode = coda_alloc_inode,
107 .destroy_inode = coda_destroy_inode,
108 .evict_inode = coda_evict_inode,
109 .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{
116 struct fd f;
117 struct inode *inode;
118 int idx;
119
120 if (data == NULL) {
121 pr_warn("%s: Bad mount data\n", __func__);
122 return -1;
123 }
124
125 if (data->version != CODA_MOUNT_VERSION) {
126 pr_warn("%s: Bad mount version\n", __func__);
127 return -1;
128 }
129
130 f = fdget(data->fd);
131 if (!f.file)
132 goto Ebadf;
133 inode = file_inode(f.file);
134 if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
135 fdput(f);
136 goto Ebadf;
137 }
138
139 idx = iminor(inode);
140 fdput(f);
141
142 if (idx < 0 || idx >= MAX_CODADEVS) {
143 pr_warn("%s: Bad minor number\n", __func__);
144 return -1;
145 }
146
147 return idx;
148Ebadf:
149 pr_warn("%s: Bad file\n", __func__);
150 return -1;
151}
152
153static int coda_fill_super(struct super_block *sb, void *data, int silent)
154{
155 struct inode *root = NULL;
156 struct venus_comm *vc;
157 struct CodaFid fid;
158 int error;
159 int idx;
160
161 if (task_active_pid_ns(current) != &init_pid_ns)
162 return -EINVAL;
163
164 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 pr_info("%s: device index: %i\n", __func__, idx);
171
172 vc = &coda_comms[idx];
173 mutex_lock(&vc->vc_mutex);
174
175 if (!vc->vc_inuse) {
176 pr_warn("%s: No pseudo device\n", __func__);
177 error = -EINVAL;
178 goto unlock_out;
179 }
180
181 if (vc->vc_sb) {
182 pr_warn("%s: Device already mounted\n", __func__);
183 error = -EBUSY;
184 goto unlock_out;
185 }
186
187 vc->vc_sb = sb;
188 mutex_unlock(&vc->vc_mutex);
189
190 sb->s_fs_info = vc;
191 sb->s_flags |= SB_NOATIME;
192 sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
193 sb->s_blocksize_bits = 12;
194 sb->s_magic = CODA_SUPER_MAGIC;
195 sb->s_op = &coda_super_operations;
196 sb->s_d_op = &coda_dentry_operations;
197
198 error = super_setup_bdi(sb);
199 if (error)
200 goto error;
201
202 /* get root fid from Venus: this needs the root inode */
203 error = venus_rootfid(sb, &fid);
204 if ( error ) {
205 pr_warn("%s: coda_get_rootfid failed with %d\n",
206 __func__, error);
207 goto error;
208 }
209 pr_info("%s: rootfid is %s\n", __func__, coda_f2s(&fid));
210
211 /* make root inode */
212 root = coda_cnode_make(&fid, sb);
213 if (IS_ERR(root)) {
214 error = PTR_ERR(root);
215 pr_warn("Failure of coda_cnode_make for root: error %d\n",
216 error);
217 goto error;
218 }
219
220 pr_info("%s: rootinode is %ld dev %s\n",
221 __func__, root->i_ino, root->i_sb->s_id);
222 sb->s_root = d_make_root(root);
223 if (!sb->s_root) {
224 error = -EINVAL;
225 goto error;
226 }
227 return 0;
228
229error:
230 mutex_lock(&vc->vc_mutex);
231 vc->vc_sb = NULL;
232 sb->s_fs_info = NULL;
233unlock_out:
234 mutex_unlock(&vc->vc_mutex);
235 return error;
236}
237
238static void coda_put_super(struct super_block *sb)
239{
240 struct venus_comm *vcp = coda_vcp(sb);
241 mutex_lock(&vcp->vc_mutex);
242 vcp->vc_sb = NULL;
243 sb->s_fs_info = NULL;
244 mutex_unlock(&vcp->vc_mutex);
245
246 pr_info("Bye bye.\n");
247}
248
249static void coda_evict_inode(struct inode *inode)
250{
251 truncate_inode_pages_final(&inode->i_data);
252 clear_inode(inode);
253 coda_cache_clear_inode(inode);
254}
255
256int coda_getattr(const struct path *path, struct kstat *stat,
257 u32 request_mask, unsigned int flags)
258{
259 int err = coda_revalidate_inode(d_inode(path->dentry));
260 if (!err)
261 generic_fillattr(d_inode(path->dentry), stat);
262 return err;
263}
264
265int coda_setattr(struct dentry *de, struct iattr *iattr)
266{
267 struct inode *inode = d_inode(de);
268 struct coda_vattr vattr;
269 int error;
270
271 memset(&vattr, 0, sizeof(vattr));
272
273 inode->i_ctime = current_time(inode);
274 coda_iattr_to_vattr(iattr, &vattr);
275 vattr.va_type = C_VNON; /* cannot set type */
276
277 /* Venus is responsible for truncating the container-file!!! */
278 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
279
280 if (!error) {
281 coda_vattr_to_iattr(inode, &vattr);
282 coda_cache_clear_inode(inode);
283 }
284 return error;
285}
286
287const struct inode_operations coda_file_inode_operations = {
288 .permission = coda_permission,
289 .getattr = coda_getattr,
290 .setattr = coda_setattr,
291};
292
293static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
294{
295 int error;
296
297 error = venus_statfs(dentry, buf);
298
299 if (error) {
300 /* fake something like AFS does */
301 buf->f_blocks = 9000000;
302 buf->f_bfree = 9000000;
303 buf->f_bavail = 9000000;
304 buf->f_files = 9000000;
305 buf->f_ffree = 9000000;
306 }
307
308 /* and fill in the rest */
309 buf->f_type = CODA_SUPER_MAGIC;
310 buf->f_bsize = 4096;
311 buf->f_namelen = CODA_MAXNAMLEN;
312
313 return 0;
314}
315
316/* init_coda: used by filesystems.c to register coda */
317
318static struct dentry *coda_mount(struct file_system_type *fs_type,
319 int flags, const char *dev_name, void *data)
320{
321 return mount_nodev(fs_type, flags, data, coda_fill_super);
322}
323
324struct file_system_type coda_fs_type = {
325 .owner = THIS_MODULE,
326 .name = "coda",
327 .mount = coda_mount,
328 .kill_sb = kill_anon_super,
329 .fs_flags = FS_BINARY_MOUNTDATA,
330};
331MODULE_ALIAS_FS("coda");
332