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b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
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> | |
da47c19e | 19 | #include <linux/mutex.h> |
b5ce1d83 | 20 | #include <linux/spinlock.h> |
1da177e4 LT |
21 | #include <linux/file.h> |
22 | #include <linux/vfs.h> | |
5a0e3ad6 | 23 | #include <linux/slab.h> |
9fd973e0 | 24 | #include <linux/pid_namespace.h> |
834b46c3 | 25 | #include <linux/uaccess.h> |
1da177e4 LT |
26 | #include <linux/fs.h> |
27 | #include <linux/vmalloc.h> | |
28 | ||
29 | #include <linux/coda.h> | |
1da177e4 | 30 | #include <linux/coda_psdev.h> |
31a203df AV |
31 | #include "coda_linux.h" |
32 | #include "coda_cache.h" | |
1da177e4 | 33 | |
c98d8cfb AB |
34 | #include "coda_int.h" |
35 | ||
1da177e4 | 36 | /* VFS super_block ops */ |
b57922d9 | 37 | static void coda_evict_inode(struct inode *); |
1da177e4 | 38 | static void coda_put_super(struct super_block *); |
726c3342 | 39 | static int coda_statfs(struct dentry *dentry, struct kstatfs *buf); |
1da177e4 | 40 | |
e18b890b | 41 | static struct kmem_cache * coda_inode_cachep; |
1da177e4 LT |
42 | |
43 | static struct inode *coda_alloc_inode(struct super_block *sb) | |
44 | { | |
45 | struct coda_inode_info *ei; | |
747fecab | 46 | ei = kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
47 | if (!ei) |
48 | return NULL; | |
49 | memset(&ei->c_fid, 0, sizeof(struct CodaFid)); | |
50 | ei->c_flags = 0; | |
17499e33 | 51 | ei->c_uid = GLOBAL_ROOT_UID; |
1da177e4 | 52 | ei->c_cached_perm = 0; |
b5ce1d83 | 53 | spin_lock_init(&ei->c_lock); |
1da177e4 LT |
54 | return &ei->vfs_inode; |
55 | } | |
56 | ||
fa0d7e3d | 57 | static void coda_i_callback(struct rcu_head *head) |
1da177e4 | 58 | { |
fa0d7e3d | 59 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
60 | kmem_cache_free(coda_inode_cachep, ITOC(inode)); |
61 | } | |
62 | ||
fa0d7e3d NP |
63 | static void coda_destroy_inode(struct inode *inode) |
64 | { | |
65 | call_rcu(&inode->i_rcu, coda_i_callback); | |
66 | } | |
67 | ||
51cc5068 | 68 | static void init_once(void *foo) |
1da177e4 LT |
69 | { |
70 | struct coda_inode_info *ei = (struct coda_inode_info *) foo; | |
71 | ||
a35afb83 | 72 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 73 | } |
20c2df83 | 74 | |
5f356fd4 | 75 | int __init coda_init_inodecache(void) |
1da177e4 LT |
76 | { |
77 | coda_inode_cachep = kmem_cache_create("coda_inode_cache", | |
5d097056 VD |
78 | sizeof(struct coda_inode_info), 0, |
79 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| | |
80 | SLAB_ACCOUNT, init_once); | |
1da177e4 LT |
81 | if (coda_inode_cachep == NULL) |
82 | return -ENOMEM; | |
83 | return 0; | |
84 | } | |
85 | ||
86 | void coda_destroy_inodecache(void) | |
87 | { | |
8c0a8537 KS |
88 | /* |
89 | * Make sure all delayed rcu free inodes are flushed before we | |
90 | * destroy cache. | |
91 | */ | |
92 | rcu_barrier(); | |
1a1d92c1 | 93 | kmem_cache_destroy(coda_inode_cachep); |
1da177e4 LT |
94 | } |
95 | ||
96 | static int coda_remount(struct super_block *sb, int *flags, char *data) | |
97 | { | |
02b9984d | 98 | sync_filesystem(sb); |
1751e8a6 | 99 | *flags |= SB_NOATIME; |
1da177e4 LT |
100 | return 0; |
101 | } | |
102 | ||
103 | /* exported operations */ | |
ee9b6d61 | 104 | static const struct super_operations coda_super_operations = |
1da177e4 LT |
105 | { |
106 | .alloc_inode = coda_alloc_inode, | |
107 | .destroy_inode = coda_destroy_inode, | |
b57922d9 | 108 | .evict_inode = coda_evict_inode, |
1da177e4 LT |
109 | .put_super = coda_put_super, |
110 | .statfs = coda_statfs, | |
111 | .remount_fs = coda_remount, | |
112 | }; | |
113 | ||
114 | static int get_device_index(struct coda_mount_data *data) | |
115 | { | |
2903ff01 | 116 | struct fd f; |
1da177e4 | 117 | struct inode *inode; |
2903ff01 | 118 | int idx; |
1da177e4 | 119 | |
78f7d75e | 120 | if (data == NULL) { |
6d6bd94f | 121 | pr_warn("%s: Bad mount data\n", __func__); |
1da177e4 LT |
122 | return -1; |
123 | } | |
124 | ||
78f7d75e | 125 | if (data->version != CODA_MOUNT_VERSION) { |
6d6bd94f | 126 | pr_warn("%s: Bad mount version\n", __func__); |
1da177e4 LT |
127 | return -1; |
128 | } | |
129 | ||
2903ff01 AV |
130 | f = fdget(data->fd); |
131 | if (!f.file) | |
78f7d75e | 132 | goto Ebadf; |
496ad9aa | 133 | inode = file_inode(f.file); |
78f7d75e | 134 | if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) { |
2903ff01 | 135 | fdput(f); |
78f7d75e | 136 | goto Ebadf; |
1da177e4 LT |
137 | } |
138 | ||
139 | idx = iminor(inode); | |
2903ff01 | 140 | fdput(f); |
1da177e4 | 141 | |
78f7d75e | 142 | if (idx < 0 || idx >= MAX_CODADEVS) { |
6d6bd94f | 143 | pr_warn("%s: Bad minor number\n", __func__); |
1da177e4 LT |
144 | return -1; |
145 | } | |
146 | ||
147 | return idx; | |
78f7d75e | 148 | Ebadf: |
6d6bd94f | 149 | pr_warn("%s: Bad file\n", __func__); |
78f7d75e | 150 | return -1; |
1da177e4 LT |
151 | } |
152 | ||
153 | static int coda_fill_super(struct super_block *sb, void *data, int silent) | |
154 | { | |
a1b0aa87 | 155 | struct inode *root = NULL; |
da47c19e | 156 | struct venus_comm *vc; |
1da177e4 | 157 | struct CodaFid fid; |
a1b0aa87 | 158 | int error; |
1da177e4 LT |
159 | int idx; |
160 | ||
9fd973e0 EB |
161 | if (task_active_pid_ns(current) != &init_pid_ns) |
162 | return -EINVAL; | |
163 | ||
1da177e4 LT |
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 | ||
6d6bd94f | 170 | pr_info("%s: device index: %i\n", __func__, idx); |
1da177e4 LT |
171 | |
172 | vc = &coda_comms[idx]; | |
da47c19e | 173 | mutex_lock(&vc->vc_mutex); |
f7cc02b8 | 174 | |
1da177e4 | 175 | if (!vc->vc_inuse) { |
6d6bd94f | 176 | pr_warn("%s: No pseudo device\n", __func__); |
f7cc02b8 YA |
177 | error = -EINVAL; |
178 | goto unlock_out; | |
1da177e4 LT |
179 | } |
180 | ||
f7cc02b8 | 181 | if (vc->vc_sb) { |
6d6bd94f | 182 | pr_warn("%s: Device already mounted\n", __func__); |
f7cc02b8 YA |
183 | error = -EBUSY; |
184 | goto unlock_out; | |
1da177e4 LT |
185 | } |
186 | ||
1da177e4 | 187 | vc->vc_sb = sb; |
da47c19e | 188 | mutex_unlock(&vc->vc_mutex); |
1da177e4 | 189 | |
a1b0aa87 | 190 | sb->s_fs_info = vc; |
1751e8a6 | 191 | sb->s_flags |= SB_NOATIME; |
fac1f0e3 JH |
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; | |
9501e4c4 | 196 | sb->s_d_op = &coda_dentry_operations; |
a5695a79 JK |
197 | |
198 | error = super_setup_bdi(sb); | |
199 | if (error) | |
200 | goto error; | |
1da177e4 LT |
201 | |
202 | /* get root fid from Venus: this needs the root inode */ | |
203 | error = venus_rootfid(sb, &fid); | |
204 | if ( error ) { | |
6d6bd94f FF |
205 | pr_warn("%s: coda_get_rootfid failed with %d\n", |
206 | __func__, error); | |
1da177e4 LT |
207 | goto error; |
208 | } | |
6d6bd94f | 209 | pr_info("%s: rootfid is %s\n", __func__, coda_f2s(&fid)); |
1da177e4 LT |
210 | |
211 | /* make root inode */ | |
f4947fbc AV |
212 | root = coda_cnode_make(&fid, sb); |
213 | if (IS_ERR(root)) { | |
214 | error = PTR_ERR(root); | |
d9b4b319 FF |
215 | pr_warn("Failure of coda_cnode_make for root: error %d\n", |
216 | error); | |
f4947fbc | 217 | goto error; |
1da177e4 LT |
218 | } |
219 | ||
6d6bd94f FF |
220 | pr_info("%s: rootinode is %ld dev %s\n", |
221 | __func__, root->i_ino, root->i_sb->s_id); | |
48fde701 | 222 | sb->s_root = d_make_root(root); |
f7cc02b8 YA |
223 | if (!sb->s_root) { |
224 | error = -EINVAL; | |
1da177e4 | 225 | goto error; |
f7cc02b8 | 226 | } |
db719222 | 227 | return 0; |
1da177e4 | 228 | |
f7cc02b8 | 229 | error: |
da47c19e | 230 | mutex_lock(&vc->vc_mutex); |
f7cc02b8 YA |
231 | vc->vc_sb = NULL; |
232 | sb->s_fs_info = NULL; | |
233 | unlock_out: | |
da47c19e | 234 | mutex_unlock(&vc->vc_mutex); |
f7cc02b8 | 235 | return error; |
1da177e4 LT |
236 | } |
237 | ||
238 | static void coda_put_super(struct super_block *sb) | |
239 | { | |
da47c19e YA |
240 | struct venus_comm *vcp = coda_vcp(sb); |
241 | mutex_lock(&vcp->vc_mutex); | |
da47c19e | 242 | vcp->vc_sb = NULL; |
a1b0aa87 | 243 | sb->s_fs_info = NULL; |
da47c19e | 244 | mutex_unlock(&vcp->vc_mutex); |
1da177e4 | 245 | |
f38cfb25 | 246 | pr_info("Bye bye.\n"); |
1da177e4 LT |
247 | } |
248 | ||
b57922d9 | 249 | static void coda_evict_inode(struct inode *inode) |
1da177e4 | 250 | { |
91b0abe3 | 251 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 252 | clear_inode(inode); |
1da177e4 LT |
253 | coda_cache_clear_inode(inode); |
254 | } | |
255 | ||
a528d35e DH |
256 | int coda_getattr(const struct path *path, struct kstat *stat, |
257 | u32 request_mask, unsigned int flags) | |
1da177e4 | 258 | { |
a528d35e | 259 | int err = coda_revalidate_inode(d_inode(path->dentry)); |
1da177e4 | 260 | if (!err) |
a528d35e | 261 | generic_fillattr(d_inode(path->dentry), stat); |
1da177e4 LT |
262 | return err; |
263 | } | |
264 | ||
265 | int coda_setattr(struct dentry *de, struct iattr *iattr) | |
266 | { | |
2b0143b5 | 267 | struct inode *inode = d_inode(de); |
1da177e4 LT |
268 | struct coda_vattr vattr; |
269 | int error; | |
270 | ||
1da177e4 LT |
271 | memset(&vattr, 0, sizeof(vattr)); |
272 | ||
02027d42 | 273 | inode->i_ctime = current_time(inode); |
1da177e4 LT |
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 | ||
f7cc02b8 | 280 | if (!error) { |
1da177e4 LT |
281 | coda_vattr_to_iattr(inode, &vattr); |
282 | coda_cache_clear_inode(inode); | |
283 | } | |
1da177e4 LT |
284 | return error; |
285 | } | |
286 | ||
754661f1 | 287 | const struct inode_operations coda_file_inode_operations = { |
1da177e4 LT |
288 | .permission = coda_permission, |
289 | .getattr = coda_getattr, | |
290 | .setattr = coda_setattr, | |
291 | }; | |
292 | ||
726c3342 | 293 | static int coda_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 LT |
294 | { |
295 | int error; | |
296 | ||
726c3342 | 297 | error = venus_statfs(dentry, buf); |
1da177e4 | 298 | |
1da177e4 LT |
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; | |
fac1f0e3 | 310 | buf->f_bsize = 4096; |
1da177e4 LT |
311 | buf->f_namelen = CODA_MAXNAMLEN; |
312 | ||
313 | return 0; | |
314 | } | |
315 | ||
316 | /* init_coda: used by filesystems.c to register coda */ | |
317 | ||
3c26ff6e AV |
318 | static struct dentry *coda_mount(struct file_system_type *fs_type, |
319 | int flags, const char *dev_name, void *data) | |
1da177e4 | 320 | { |
3c26ff6e | 321 | return mount_nodev(fs_type, flags, data, coda_fill_super); |
1da177e4 LT |
322 | } |
323 | ||
324 | struct file_system_type coda_fs_type = { | |
325 | .owner = THIS_MODULE, | |
326 | .name = "coda", | |
3c26ff6e | 327 | .mount = coda_mount, |
1da177e4 LT |
328 | .kill_sb = kill_anon_super, |
329 | .fs_flags = FS_BINARY_MOUNTDATA, | |
330 | }; | |
7f78e035 | 331 | MODULE_ALIAS_FS("coda"); |
1da177e4 | 332 |