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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> | |
8fc8b9df | 30 | #include "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 | ||
d984892b | 57 | static void coda_free_inode(struct inode *inode) |
1da177e4 LT |
58 | { |
59 | kmem_cache_free(coda_inode_cachep, ITOC(inode)); | |
60 | } | |
61 | ||
51cc5068 | 62 | static void init_once(void *foo) |
1da177e4 LT |
63 | { |
64 | struct coda_inode_info *ei = (struct coda_inode_info *) foo; | |
65 | ||
a35afb83 | 66 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 67 | } |
20c2df83 | 68 | |
5f356fd4 | 69 | int __init coda_init_inodecache(void) |
1da177e4 LT |
70 | { |
71 | coda_inode_cachep = kmem_cache_create("coda_inode_cache", | |
5d097056 VD |
72 | sizeof(struct coda_inode_info), 0, |
73 | SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| | |
74 | SLAB_ACCOUNT, init_once); | |
1da177e4 LT |
75 | if (coda_inode_cachep == NULL) |
76 | return -ENOMEM; | |
77 | return 0; | |
78 | } | |
79 | ||
80 | void coda_destroy_inodecache(void) | |
81 | { | |
8c0a8537 KS |
82 | /* |
83 | * Make sure all delayed rcu free inodes are flushed before we | |
84 | * destroy cache. | |
85 | */ | |
86 | rcu_barrier(); | |
1a1d92c1 | 87 | kmem_cache_destroy(coda_inode_cachep); |
1da177e4 LT |
88 | } |
89 | ||
90 | static int coda_remount(struct super_block *sb, int *flags, char *data) | |
91 | { | |
02b9984d | 92 | sync_filesystem(sb); |
1751e8a6 | 93 | *flags |= SB_NOATIME; |
1da177e4 LT |
94 | return 0; |
95 | } | |
96 | ||
97 | /* exported operations */ | |
ee9b6d61 | 98 | static const struct super_operations coda_super_operations = |
1da177e4 LT |
99 | { |
100 | .alloc_inode = coda_alloc_inode, | |
d984892b | 101 | .free_inode = coda_free_inode, |
b57922d9 | 102 | .evict_inode = coda_evict_inode, |
1da177e4 LT |
103 | .put_super = coda_put_super, |
104 | .statfs = coda_statfs, | |
105 | .remount_fs = coda_remount, | |
106 | }; | |
107 | ||
108 | static int get_device_index(struct coda_mount_data *data) | |
109 | { | |
2903ff01 | 110 | struct fd f; |
1da177e4 | 111 | struct inode *inode; |
2903ff01 | 112 | int idx; |
1da177e4 | 113 | |
78f7d75e | 114 | if (data == NULL) { |
6d6bd94f | 115 | pr_warn("%s: Bad mount data\n", __func__); |
1da177e4 LT |
116 | return -1; |
117 | } | |
118 | ||
78f7d75e | 119 | if (data->version != CODA_MOUNT_VERSION) { |
6d6bd94f | 120 | pr_warn("%s: Bad mount version\n", __func__); |
1da177e4 LT |
121 | return -1; |
122 | } | |
123 | ||
2903ff01 AV |
124 | f = fdget(data->fd); |
125 | if (!f.file) | |
78f7d75e | 126 | goto Ebadf; |
496ad9aa | 127 | inode = file_inode(f.file); |
78f7d75e | 128 | if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) { |
2903ff01 | 129 | fdput(f); |
78f7d75e | 130 | goto Ebadf; |
1da177e4 LT |
131 | } |
132 | ||
133 | idx = iminor(inode); | |
2903ff01 | 134 | fdput(f); |
1da177e4 | 135 | |
78f7d75e | 136 | if (idx < 0 || idx >= MAX_CODADEVS) { |
6d6bd94f | 137 | pr_warn("%s: Bad minor number\n", __func__); |
1da177e4 LT |
138 | return -1; |
139 | } | |
140 | ||
141 | return idx; | |
78f7d75e | 142 | Ebadf: |
6d6bd94f | 143 | pr_warn("%s: Bad file\n", __func__); |
78f7d75e | 144 | return -1; |
1da177e4 LT |
145 | } |
146 | ||
147 | static int coda_fill_super(struct super_block *sb, void *data, int silent) | |
148 | { | |
a1b0aa87 | 149 | struct inode *root = NULL; |
da47c19e | 150 | struct venus_comm *vc; |
1da177e4 | 151 | struct CodaFid fid; |
a1b0aa87 | 152 | int error; |
1da177e4 LT |
153 | int idx; |
154 | ||
9fd973e0 EB |
155 | if (task_active_pid_ns(current) != &init_pid_ns) |
156 | return -EINVAL; | |
157 | ||
1da177e4 LT |
158 | idx = get_device_index((struct coda_mount_data *) data); |
159 | ||
160 | /* Ignore errors in data, for backward compatibility */ | |
161 | if(idx == -1) | |
162 | idx = 0; | |
163 | ||
6d6bd94f | 164 | pr_info("%s: device index: %i\n", __func__, idx); |
1da177e4 LT |
165 | |
166 | vc = &coda_comms[idx]; | |
da47c19e | 167 | mutex_lock(&vc->vc_mutex); |
f7cc02b8 | 168 | |
1da177e4 | 169 | if (!vc->vc_inuse) { |
6d6bd94f | 170 | pr_warn("%s: No pseudo device\n", __func__); |
f7cc02b8 YA |
171 | error = -EINVAL; |
172 | goto unlock_out; | |
1da177e4 LT |
173 | } |
174 | ||
f7cc02b8 | 175 | if (vc->vc_sb) { |
6d6bd94f | 176 | pr_warn("%s: Device already mounted\n", __func__); |
f7cc02b8 YA |
177 | error = -EBUSY; |
178 | goto unlock_out; | |
1da177e4 LT |
179 | } |
180 | ||
1da177e4 | 181 | vc->vc_sb = sb; |
da47c19e | 182 | mutex_unlock(&vc->vc_mutex); |
1da177e4 | 183 | |
a1b0aa87 | 184 | sb->s_fs_info = vc; |
1751e8a6 | 185 | sb->s_flags |= SB_NOATIME; |
fac1f0e3 JH |
186 | sb->s_blocksize = 4096; /* XXXXX what do we put here?? */ |
187 | sb->s_blocksize_bits = 12; | |
188 | sb->s_magic = CODA_SUPER_MAGIC; | |
189 | sb->s_op = &coda_super_operations; | |
9501e4c4 | 190 | sb->s_d_op = &coda_dentry_operations; |
22b13969 DD |
191 | sb->s_time_gran = 1; |
192 | sb->s_time_min = S64_MIN; | |
193 | sb->s_time_max = S64_MAX; | |
a5695a79 JK |
194 | |
195 | error = super_setup_bdi(sb); | |
196 | if (error) | |
197 | goto error; | |
1da177e4 LT |
198 | |
199 | /* get root fid from Venus: this needs the root inode */ | |
200 | error = venus_rootfid(sb, &fid); | |
201 | if ( error ) { | |
6d6bd94f FF |
202 | pr_warn("%s: coda_get_rootfid failed with %d\n", |
203 | __func__, error); | |
1da177e4 LT |
204 | goto error; |
205 | } | |
6d6bd94f | 206 | pr_info("%s: rootfid is %s\n", __func__, coda_f2s(&fid)); |
1da177e4 LT |
207 | |
208 | /* make root inode */ | |
f4947fbc AV |
209 | root = coda_cnode_make(&fid, sb); |
210 | if (IS_ERR(root)) { | |
211 | error = PTR_ERR(root); | |
d9b4b319 FF |
212 | pr_warn("Failure of coda_cnode_make for root: error %d\n", |
213 | error); | |
f4947fbc | 214 | goto error; |
1da177e4 LT |
215 | } |
216 | ||
6d6bd94f FF |
217 | pr_info("%s: rootinode is %ld dev %s\n", |
218 | __func__, root->i_ino, root->i_sb->s_id); | |
48fde701 | 219 | sb->s_root = d_make_root(root); |
f7cc02b8 YA |
220 | if (!sb->s_root) { |
221 | error = -EINVAL; | |
1da177e4 | 222 | goto error; |
f7cc02b8 | 223 | } |
db719222 | 224 | return 0; |
1da177e4 | 225 | |
f7cc02b8 | 226 | error: |
da47c19e | 227 | mutex_lock(&vc->vc_mutex); |
f7cc02b8 YA |
228 | vc->vc_sb = NULL; |
229 | sb->s_fs_info = NULL; | |
230 | unlock_out: | |
da47c19e | 231 | mutex_unlock(&vc->vc_mutex); |
f7cc02b8 | 232 | return error; |
1da177e4 LT |
233 | } |
234 | ||
235 | static void coda_put_super(struct super_block *sb) | |
236 | { | |
da47c19e YA |
237 | struct venus_comm *vcp = coda_vcp(sb); |
238 | mutex_lock(&vcp->vc_mutex); | |
da47c19e | 239 | vcp->vc_sb = NULL; |
a1b0aa87 | 240 | sb->s_fs_info = NULL; |
da47c19e | 241 | mutex_unlock(&vcp->vc_mutex); |
79a0d65e | 242 | mutex_destroy(&vcp->vc_mutex); |
1da177e4 | 243 | |
f38cfb25 | 244 | pr_info("Bye bye.\n"); |
1da177e4 LT |
245 | } |
246 | ||
b57922d9 | 247 | static void coda_evict_inode(struct inode *inode) |
1da177e4 | 248 | { |
91b0abe3 | 249 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 250 | clear_inode(inode); |
1da177e4 LT |
251 | coda_cache_clear_inode(inode); |
252 | } | |
253 | ||
a528d35e DH |
254 | int coda_getattr(const struct path *path, struct kstat *stat, |
255 | u32 request_mask, unsigned int flags) | |
1da177e4 | 256 | { |
a528d35e | 257 | int err = coda_revalidate_inode(d_inode(path->dentry)); |
1da177e4 | 258 | if (!err) |
a528d35e | 259 | generic_fillattr(d_inode(path->dentry), stat); |
1da177e4 LT |
260 | return err; |
261 | } | |
262 | ||
263 | int coda_setattr(struct dentry *de, struct iattr *iattr) | |
264 | { | |
2b0143b5 | 265 | struct inode *inode = d_inode(de); |
1da177e4 LT |
266 | struct coda_vattr vattr; |
267 | int error; | |
268 | ||
1da177e4 LT |
269 | memset(&vattr, 0, sizeof(vattr)); |
270 | ||
02027d42 | 271 | inode->i_ctime = current_time(inode); |
1da177e4 LT |
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 | ||
f7cc02b8 | 278 | if (!error) { |
1da177e4 LT |
279 | coda_vattr_to_iattr(inode, &vattr); |
280 | coda_cache_clear_inode(inode); | |
281 | } | |
1da177e4 LT |
282 | return error; |
283 | } | |
284 | ||
754661f1 | 285 | const struct inode_operations coda_file_inode_operations = { |
1da177e4 LT |
286 | .permission = coda_permission, |
287 | .getattr = coda_getattr, | |
288 | .setattr = coda_setattr, | |
289 | }; | |
290 | ||
726c3342 | 291 | static int coda_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 LT |
292 | { |
293 | int error; | |
294 | ||
726c3342 | 295 | error = venus_statfs(dentry, buf); |
1da177e4 | 296 | |
1da177e4 LT |
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; | |
fac1f0e3 | 308 | buf->f_bsize = 4096; |
1da177e4 LT |
309 | buf->f_namelen = CODA_MAXNAMLEN; |
310 | ||
311 | return 0; | |
312 | } | |
313 | ||
314 | /* init_coda: used by filesystems.c to register coda */ | |
315 | ||
3c26ff6e AV |
316 | static struct dentry *coda_mount(struct file_system_type *fs_type, |
317 | int flags, const char *dev_name, void *data) | |
1da177e4 | 318 | { |
3c26ff6e | 319 | return mount_nodev(fs_type, flags, data, coda_fill_super); |
1da177e4 LT |
320 | } |
321 | ||
322 | struct file_system_type coda_fs_type = { | |
323 | .owner = THIS_MODULE, | |
324 | .name = "coda", | |
3c26ff6e | 325 | .mount = coda_mount, |
1da177e4 LT |
326 | .kill_sb = kill_anon_super, |
327 | .fs_flags = FS_BINARY_MOUNTDATA, | |
328 | }; | |
7f78e035 | 329 | MODULE_ALIAS_FS("coda"); |
1da177e4 | 330 |