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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/uaccess.h>
25
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 = 0;
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 coda_init_inodecache(void)
76{
77 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
78 sizeof(struct coda_inode_info),
79 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
80 init_once);
81 if (coda_inode_cachep == NULL)
82 return -ENOMEM;
83 return 0;
84}
85
86void coda_destroy_inodecache(void)
87{
88 kmem_cache_destroy(coda_inode_cachep);
89}
90
91static int coda_remount(struct super_block *sb, int *flags, char *data)
92{
93 *flags |= MS_NOATIME;
94 return 0;
95}
96
97/* exported operations */
98static const struct super_operations coda_super_operations =
99{
100 .alloc_inode = coda_alloc_inode,
101 .destroy_inode = coda_destroy_inode,
102 .evict_inode = coda_evict_inode,
103 .put_super = coda_put_super,
104 .statfs = coda_statfs,
105 .remount_fs = coda_remount,
106};
107
108static int get_device_index(struct coda_mount_data *data)
109{
110 struct file *file;
111 struct inode *inode;
112 int idx;
113
114 if(data == NULL) {
115 printk("coda_read_super: Bad mount data\n");
116 return -1;
117 }
118
119 if(data->version != CODA_MOUNT_VERSION) {
120 printk("coda_read_super: Bad mount version\n");
121 return -1;
122 }
123
124 file = fget(data->fd);
125 inode = NULL;
126 if(file)
127 inode = file->f_path.dentry->d_inode;
128
129 if(!inode || !S_ISCHR(inode->i_mode) ||
130 imajor(inode) != CODA_PSDEV_MAJOR) {
131 if(file)
132 fput(file);
133
134 printk("coda_read_super: Bad file\n");
135 return -1;
136 }
137
138 idx = iminor(inode);
139 fput(file);
140
141 if(idx < 0 || idx >= MAX_CODADEVS) {
142 printk("coda_read_super: Bad minor number\n");
143 return -1;
144 }
145
146 return idx;
147}
148
149static int coda_fill_super(struct super_block *sb, void *data, int silent)
150{
151 struct inode *root = NULL;
152 struct venus_comm *vc;
153 struct CodaFid fid;
154 int error;
155 int idx;
156
157 idx = get_device_index((struct coda_mount_data *) data);
158
159 /* Ignore errors in data, for backward compatibility */
160 if(idx == -1)
161 idx = 0;
162
163 printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
164
165 vc = &coda_comms[idx];
166 mutex_lock(&vc->vc_mutex);
167
168 if (!vc->vc_inuse) {
169 printk("coda_read_super: No pseudo device\n");
170 error = -EINVAL;
171 goto unlock_out;
172 }
173
174 if (vc->vc_sb) {
175 printk("coda_read_super: Device already mounted\n");
176 error = -EBUSY;
177 goto unlock_out;
178 }
179
180 error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
181 if (error)
182 goto unlock_out;
183
184 vc->vc_sb = sb;
185 mutex_unlock(&vc->vc_mutex);
186
187 sb->s_fs_info = vc;
188 sb->s_flags |= MS_NOATIME;
189 sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
190 sb->s_blocksize_bits = 12;
191 sb->s_magic = CODA_SUPER_MAGIC;
192 sb->s_op = &coda_super_operations;
193 sb->s_d_op = &coda_dentry_operations;
194 sb->s_bdi = &vc->bdi;
195
196 /* get root fid from Venus: this needs the root inode */
197 error = venus_rootfid(sb, &fid);
198 if ( error ) {
199 printk("coda_read_super: coda_get_rootfid failed with %d\n",
200 error);
201 goto error;
202 }
203 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
204
205 /* make root inode */
206 root = coda_cnode_make(&fid, sb);
207 if (IS_ERR(root)) {
208 error = PTR_ERR(root);
209 printk("Failure of coda_cnode_make for root: error %d\n", error);
210 goto error;
211 }
212
213 printk("coda_read_super: rootinode is %ld dev %s\n",
214 root->i_ino, root->i_sb->s_id);
215 sb->s_root = d_make_root(root);
216 if (!sb->s_root) {
217 error = -EINVAL;
218 goto error;
219 }
220 return 0;
221
222error:
223 mutex_lock(&vc->vc_mutex);
224 bdi_destroy(&vc->bdi);
225 vc->vc_sb = NULL;
226 sb->s_fs_info = NULL;
227unlock_out:
228 mutex_unlock(&vc->vc_mutex);
229 return error;
230}
231
232static void coda_put_super(struct super_block *sb)
233{
234 struct venus_comm *vcp = coda_vcp(sb);
235 mutex_lock(&vcp->vc_mutex);
236 bdi_destroy(&vcp->bdi);
237 vcp->vc_sb = NULL;
238 sb->s_fs_info = NULL;
239 mutex_unlock(&vcp->vc_mutex);
240
241 printk("Coda: Bye bye.\n");
242}
243
244static void coda_evict_inode(struct inode *inode)
245{
246 truncate_inode_pages(&inode->i_data, 0);
247 clear_inode(inode);
248 coda_cache_clear_inode(inode);
249}
250
251int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
252{
253 int err = coda_revalidate_inode(dentry);
254 if (!err)
255 generic_fillattr(dentry->d_inode, stat);
256 return err;
257}
258
259int coda_setattr(struct dentry *de, struct iattr *iattr)
260{
261 struct inode *inode = de->d_inode;
262 struct coda_vattr vattr;
263 int error;
264
265 memset(&vattr, 0, sizeof(vattr));
266
267 inode->i_ctime = CURRENT_TIME_SEC;
268 coda_iattr_to_vattr(iattr, &vattr);
269 vattr.va_type = C_VNON; /* cannot set type */
270
271 /* Venus is responsible for truncating the container-file!!! */
272 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
273
274 if (!error) {
275 coda_vattr_to_iattr(inode, &vattr);
276 coda_cache_clear_inode(inode);
277 }
278 return error;
279}
280
281const struct inode_operations coda_file_inode_operations = {
282 .permission = coda_permission,
283 .getattr = coda_getattr,
284 .setattr = coda_setattr,
285};
286
287static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
288{
289 int error;
290
291 error = venus_statfs(dentry, buf);
292
293 if (error) {
294 /* fake something like AFS does */
295 buf->f_blocks = 9000000;
296 buf->f_bfree = 9000000;
297 buf->f_bavail = 9000000;
298 buf->f_files = 9000000;
299 buf->f_ffree = 9000000;
300 }
301
302 /* and fill in the rest */
303 buf->f_type = CODA_SUPER_MAGIC;
304 buf->f_bsize = 4096;
305 buf->f_namelen = CODA_MAXNAMLEN;
306
307 return 0;
308}
309
310/* init_coda: used by filesystems.c to register coda */
311
312static struct dentry *coda_mount(struct file_system_type *fs_type,
313 int flags, const char *dev_name, void *data)
314{
315 return mount_nodev(fs_type, flags, data, coda_fill_super);
316}
317
318struct file_system_type coda_fs_type = {
319 .owner = THIS_MODULE,
320 .name = "coda",
321 .mount = coda_mount,
322 .kill_sb = kill_anon_super,
323 .fs_flags = FS_BINARY_MOUNTDATA,
324};
325
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/fs_context.h>
28#include <linux/fs_parser.h>
29#include <linux/vmalloc.h>
30
31#include <linux/coda.h>
32#include "coda_psdev.h"
33#include "coda_linux.h"
34#include "coda_cache.h"
35
36#include "coda_int.h"
37
38/* VFS super_block ops */
39static void coda_evict_inode(struct inode *);
40static void coda_put_super(struct super_block *);
41static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);
42
43static struct kmem_cache * coda_inode_cachep;
44
45static struct inode *coda_alloc_inode(struct super_block *sb)
46{
47 struct coda_inode_info *ei;
48 ei = alloc_inode_sb(sb, coda_inode_cachep, GFP_KERNEL);
49 if (!ei)
50 return NULL;
51 memset(&ei->c_fid, 0, sizeof(struct CodaFid));
52 ei->c_flags = 0;
53 ei->c_uid = GLOBAL_ROOT_UID;
54 ei->c_cached_perm = 0;
55 spin_lock_init(&ei->c_lock);
56 return &ei->vfs_inode;
57}
58
59static void coda_free_inode(struct inode *inode)
60{
61 kmem_cache_free(coda_inode_cachep, ITOC(inode));
62}
63
64static void init_once(void *foo)
65{
66 struct coda_inode_info *ei = (struct coda_inode_info *) foo;
67
68 inode_init_once(&ei->vfs_inode);
69}
70
71int __init coda_init_inodecache(void)
72{
73 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
74 sizeof(struct coda_inode_info), 0,
75 SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT,
76 init_once);
77 if (coda_inode_cachep == NULL)
78 return -ENOMEM;
79 return 0;
80}
81
82void coda_destroy_inodecache(void)
83{
84 /*
85 * Make sure all delayed rcu free inodes are flushed before we
86 * destroy cache.
87 */
88 rcu_barrier();
89 kmem_cache_destroy(coda_inode_cachep);
90}
91
92static int coda_reconfigure(struct fs_context *fc)
93{
94 sync_filesystem(fc->root->d_sb);
95 fc->sb_flags |= SB_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 .free_inode = coda_free_inode,
104 .evict_inode = coda_evict_inode,
105 .put_super = coda_put_super,
106 .statfs = coda_statfs,
107};
108
109struct coda_fs_context {
110 int idx;
111};
112
113enum {
114 Opt_fd,
115};
116
117static const struct fs_parameter_spec coda_param_specs[] = {
118 fsparam_fd ("fd", Opt_fd),
119 {}
120};
121
122static int coda_set_idx(struct fs_context *fc, struct file *file)
123{
124 struct coda_fs_context *ctx = fc->fs_private;
125 struct inode *inode;
126 int idx;
127
128 inode = file_inode(file);
129 if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
130 return invalf(fc, "coda: Not coda psdev");
131 }
132 idx = iminor(inode);
133 if (idx < 0 || idx >= MAX_CODADEVS)
134 return invalf(fc, "coda: Bad minor number");
135 ctx->idx = idx;
136 return 0;
137}
138
139static int coda_parse_fd(struct fs_context *fc, struct fs_parameter *param,
140 struct fs_parse_result *result)
141{
142 struct file *file;
143 int err;
144
145 if (param->type == fs_value_is_file) {
146 file = param->file;
147 param->file = NULL;
148 } else {
149 file = fget(result->uint_32);
150 }
151 if (!file)
152 return -EBADF;
153
154 err = coda_set_idx(fc, file);
155 fput(file);
156 return err;
157}
158
159static int coda_parse_param(struct fs_context *fc, struct fs_parameter *param)
160{
161 struct fs_parse_result result;
162 int opt;
163
164 opt = fs_parse(fc, coda_param_specs, param, &result);
165 if (opt < 0)
166 return opt;
167
168 switch (opt) {
169 case Opt_fd:
170 return coda_parse_fd(fc, param, &result);
171 }
172
173 return 0;
174}
175
176/*
177 * Parse coda's binary mount data form. We ignore any errors and go with index
178 * 0 if we get one for backward compatibility.
179 */
180static int coda_parse_monolithic(struct fs_context *fc, void *_data)
181{
182 struct file *file;
183 struct coda_mount_data *data = _data;
184
185 if (!data)
186 return invalf(fc, "coda: Bad mount data");
187
188 if (data->version != CODA_MOUNT_VERSION)
189 return invalf(fc, "coda: Bad mount version");
190
191 file = fget(data->fd);
192 if (file) {
193 coda_set_idx(fc, file);
194 fput(file);
195 }
196 return 0;
197}
198
199static int coda_fill_super(struct super_block *sb, struct fs_context *fc)
200{
201 struct coda_fs_context *ctx = fc->fs_private;
202 struct inode *root = NULL;
203 struct venus_comm *vc;
204 struct CodaFid fid;
205 int error;
206
207 infof(fc, "coda: device index: %i\n", ctx->idx);
208
209 vc = &coda_comms[ctx->idx];
210 mutex_lock(&vc->vc_mutex);
211
212 if (!vc->vc_inuse) {
213 errorf(fc, "coda: No pseudo device");
214 error = -EINVAL;
215 goto unlock_out;
216 }
217
218 if (vc->vc_sb) {
219 errorf(fc, "coda: Device already mounted");
220 error = -EBUSY;
221 goto unlock_out;
222 }
223
224 vc->vc_sb = sb;
225 mutex_unlock(&vc->vc_mutex);
226
227 sb->s_fs_info = vc;
228 sb->s_flags |= SB_NOATIME;
229 sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
230 sb->s_blocksize_bits = 12;
231 sb->s_magic = CODA_SUPER_MAGIC;
232 sb->s_op = &coda_super_operations;
233 sb->s_d_op = &coda_dentry_operations;
234 sb->s_time_gran = 1;
235 sb->s_time_min = S64_MIN;
236 sb->s_time_max = S64_MAX;
237
238 error = super_setup_bdi(sb);
239 if (error)
240 goto error;
241
242 /* get root fid from Venus: this needs the root inode */
243 error = venus_rootfid(sb, &fid);
244 if ( error ) {
245 pr_warn("%s: coda_get_rootfid failed with %d\n",
246 __func__, error);
247 goto error;
248 }
249 pr_info("%s: rootfid is %s\n", __func__, coda_f2s(&fid));
250
251 /* make root inode */
252 root = coda_cnode_make(&fid, sb);
253 if (IS_ERR(root)) {
254 error = PTR_ERR(root);
255 pr_warn("Failure of coda_cnode_make for root: error %d\n",
256 error);
257 goto error;
258 }
259
260 pr_info("%s: rootinode is %ld dev %s\n",
261 __func__, root->i_ino, root->i_sb->s_id);
262 sb->s_root = d_make_root(root);
263 if (!sb->s_root) {
264 error = -EINVAL;
265 goto error;
266 }
267 return 0;
268
269error:
270 mutex_lock(&vc->vc_mutex);
271 vc->vc_sb = NULL;
272 sb->s_fs_info = NULL;
273unlock_out:
274 mutex_unlock(&vc->vc_mutex);
275 return error;
276}
277
278static void coda_put_super(struct super_block *sb)
279{
280 struct venus_comm *vcp = coda_vcp(sb);
281 mutex_lock(&vcp->vc_mutex);
282 vcp->vc_sb = NULL;
283 sb->s_fs_info = NULL;
284 mutex_unlock(&vcp->vc_mutex);
285 mutex_destroy(&vcp->vc_mutex);
286
287 pr_info("Bye bye.\n");
288}
289
290static void coda_evict_inode(struct inode *inode)
291{
292 truncate_inode_pages_final(&inode->i_data);
293 clear_inode(inode);
294 coda_cache_clear_inode(inode);
295}
296
297int coda_getattr(struct mnt_idmap *idmap, const struct path *path,
298 struct kstat *stat, u32 request_mask, unsigned int flags)
299{
300 int err = coda_revalidate_inode(d_inode(path->dentry));
301 if (!err)
302 generic_fillattr(&nop_mnt_idmap, request_mask,
303 d_inode(path->dentry), stat);
304 return err;
305}
306
307int coda_setattr(struct mnt_idmap *idmap, struct dentry *de,
308 struct iattr *iattr)
309{
310 struct inode *inode = d_inode(de);
311 struct coda_vattr vattr;
312 int error;
313
314 memset(&vattr, 0, sizeof(vattr));
315
316 inode_set_ctime_current(inode);
317 coda_iattr_to_vattr(iattr, &vattr);
318 vattr.va_type = C_VNON; /* cannot set type */
319
320 /* Venus is responsible for truncating the container-file!!! */
321 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
322
323 if (!error) {
324 coda_vattr_to_iattr(inode, &vattr);
325 coda_cache_clear_inode(inode);
326 }
327 return error;
328}
329
330const struct inode_operations coda_file_inode_operations = {
331 .permission = coda_permission,
332 .getattr = coda_getattr,
333 .setattr = coda_setattr,
334};
335
336static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
337{
338 int error;
339
340 error = venus_statfs(dentry, buf);
341
342 if (error) {
343 /* fake something like AFS does */
344 buf->f_blocks = 9000000;
345 buf->f_bfree = 9000000;
346 buf->f_bavail = 9000000;
347 buf->f_files = 9000000;
348 buf->f_ffree = 9000000;
349 }
350
351 /* and fill in the rest */
352 buf->f_type = CODA_SUPER_MAGIC;
353 buf->f_bsize = 4096;
354 buf->f_namelen = CODA_MAXNAMLEN;
355
356 return 0;
357}
358
359static int coda_get_tree(struct fs_context *fc)
360{
361 if (task_active_pid_ns(current) != &init_pid_ns)
362 return -EINVAL;
363
364 return get_tree_nodev(fc, coda_fill_super);
365}
366
367static void coda_free_fc(struct fs_context *fc)
368{
369 kfree(fc->fs_private);
370}
371
372static const struct fs_context_operations coda_context_ops = {
373 .free = coda_free_fc,
374 .parse_param = coda_parse_param,
375 .parse_monolithic = coda_parse_monolithic,
376 .get_tree = coda_get_tree,
377 .reconfigure = coda_reconfigure,
378};
379
380static int coda_init_fs_context(struct fs_context *fc)
381{
382 struct coda_fs_context *ctx;
383
384 ctx = kzalloc(sizeof(struct coda_fs_context), GFP_KERNEL);
385 if (!ctx)
386 return -ENOMEM;
387
388 fc->fs_private = ctx;
389 fc->ops = &coda_context_ops;
390 return 0;
391}
392
393struct file_system_type coda_fs_type = {
394 .owner = THIS_MODULE,
395 .name = "coda",
396 .init_fs_context = coda_init_fs_context,
397 .parameters = coda_param_specs,
398 .kill_sb = kill_anon_super,
399 .fs_flags = FS_BINARY_MOUNTDATA,
400};
401MODULE_ALIAS_FS("coda");
402