Commit | Line | Data |
---|---|---|
1da177e4 LT |
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> | |
da47c19e | 18 | #include <linux/mutex.h> |
b5ce1d83 | 19 | #include <linux/spinlock.h> |
1da177e4 LT |
20 | #include <linux/file.h> |
21 | #include <linux/vfs.h> | |
5a0e3ad6 | 22 | #include <linux/slab.h> |
9fd973e0 | 23 | #include <linux/pid_namespace.h> |
1da177e4 | 24 | |
1da177e4 LT |
25 | #include <asm/uaccess.h> |
26 | ||
27 | #include <linux/fs.h> | |
28 | #include <linux/vmalloc.h> | |
29 | ||
30 | #include <linux/coda.h> | |
1da177e4 | 31 | #include <linux/coda_psdev.h> |
31a203df AV |
32 | #include "coda_linux.h" |
33 | #include "coda_cache.h" | |
1da177e4 | 34 | |
c98d8cfb AB |
35 | #include "coda_int.h" |
36 | ||
1da177e4 | 37 | /* VFS super_block ops */ |
b57922d9 | 38 | static void coda_evict_inode(struct inode *); |
1da177e4 | 39 | static void coda_put_super(struct super_block *); |
726c3342 | 40 | static int coda_statfs(struct dentry *dentry, struct kstatfs *buf); |
1da177e4 | 41 | |
e18b890b | 42 | static struct kmem_cache * coda_inode_cachep; |
1da177e4 LT |
43 | |
44 | static struct inode *coda_alloc_inode(struct super_block *sb) | |
45 | { | |
46 | struct coda_inode_info *ei; | |
747fecab | 47 | ei = kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
48 | if (!ei) |
49 | return NULL; | |
50 | memset(&ei->c_fid, 0, sizeof(struct CodaFid)); | |
51 | ei->c_flags = 0; | |
17499e33 | 52 | ei->c_uid = GLOBAL_ROOT_UID; |
1da177e4 | 53 | ei->c_cached_perm = 0; |
b5ce1d83 | 54 | spin_lock_init(&ei->c_lock); |
1da177e4 LT |
55 | return &ei->vfs_inode; |
56 | } | |
57 | ||
fa0d7e3d | 58 | static void coda_i_callback(struct rcu_head *head) |
1da177e4 | 59 | { |
fa0d7e3d | 60 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
61 | kmem_cache_free(coda_inode_cachep, ITOC(inode)); |
62 | } | |
63 | ||
fa0d7e3d NP |
64 | static void coda_destroy_inode(struct inode *inode) |
65 | { | |
66 | call_rcu(&inode->i_rcu, coda_i_callback); | |
67 | } | |
68 | ||
51cc5068 | 69 | static void init_once(void *foo) |
1da177e4 LT |
70 | { |
71 | struct coda_inode_info *ei = (struct coda_inode_info *) foo; | |
72 | ||
a35afb83 | 73 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 74 | } |
20c2df83 | 75 | |
5f356fd4 | 76 | int __init coda_init_inodecache(void) |
1da177e4 LT |
77 | { |
78 | coda_inode_cachep = kmem_cache_create("coda_inode_cache", | |
79 | sizeof(struct coda_inode_info), | |
4b6a9316 | 80 | 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, |
20c2df83 | 81 | init_once); |
1da177e4 LT |
82 | if (coda_inode_cachep == NULL) |
83 | return -ENOMEM; | |
84 | return 0; | |
85 | } | |
86 | ||
87 | void coda_destroy_inodecache(void) | |
88 | { | |
8c0a8537 KS |
89 | /* |
90 | * Make sure all delayed rcu free inodes are flushed before we | |
91 | * destroy cache. | |
92 | */ | |
93 | rcu_barrier(); | |
1a1d92c1 | 94 | kmem_cache_destroy(coda_inode_cachep); |
1da177e4 LT |
95 | } |
96 | ||
97 | static int coda_remount(struct super_block *sb, int *flags, char *data) | |
98 | { | |
02b9984d | 99 | sync_filesystem(sb); |
fac1f0e3 | 100 | *flags |= MS_NOATIME; |
1da177e4 LT |
101 | return 0; |
102 | } | |
103 | ||
104 | /* exported operations */ | |
ee9b6d61 | 105 | static const struct super_operations coda_super_operations = |
1da177e4 LT |
106 | { |
107 | .alloc_inode = coda_alloc_inode, | |
108 | .destroy_inode = coda_destroy_inode, | |
b57922d9 | 109 | .evict_inode = coda_evict_inode, |
1da177e4 LT |
110 | .put_super = coda_put_super, |
111 | .statfs = coda_statfs, | |
112 | .remount_fs = coda_remount, | |
113 | }; | |
114 | ||
115 | static int get_device_index(struct coda_mount_data *data) | |
116 | { | |
2903ff01 | 117 | struct fd f; |
1da177e4 | 118 | struct inode *inode; |
2903ff01 | 119 | int idx; |
1da177e4 | 120 | |
78f7d75e | 121 | if (data == NULL) { |
6d6bd94f | 122 | pr_warn("%s: Bad mount data\n", __func__); |
1da177e4 LT |
123 | return -1; |
124 | } | |
125 | ||
78f7d75e | 126 | if (data->version != CODA_MOUNT_VERSION) { |
6d6bd94f | 127 | pr_warn("%s: Bad mount version\n", __func__); |
1da177e4 LT |
128 | return -1; |
129 | } | |
130 | ||
2903ff01 AV |
131 | f = fdget(data->fd); |
132 | if (!f.file) | |
78f7d75e | 133 | goto Ebadf; |
496ad9aa | 134 | inode = file_inode(f.file); |
78f7d75e | 135 | if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) { |
2903ff01 | 136 | fdput(f); |
78f7d75e | 137 | goto Ebadf; |
1da177e4 LT |
138 | } |
139 | ||
140 | idx = iminor(inode); | |
2903ff01 | 141 | fdput(f); |
1da177e4 | 142 | |
78f7d75e | 143 | if (idx < 0 || idx >= MAX_CODADEVS) { |
6d6bd94f | 144 | pr_warn("%s: Bad minor number\n", __func__); |
1da177e4 LT |
145 | return -1; |
146 | } | |
147 | ||
148 | return idx; | |
78f7d75e | 149 | Ebadf: |
6d6bd94f | 150 | pr_warn("%s: Bad file\n", __func__); |
78f7d75e | 151 | return -1; |
1da177e4 LT |
152 | } |
153 | ||
154 | static int coda_fill_super(struct super_block *sb, void *data, int silent) | |
155 | { | |
a1b0aa87 | 156 | struct inode *root = NULL; |
da47c19e | 157 | struct venus_comm *vc; |
1da177e4 | 158 | struct CodaFid fid; |
a1b0aa87 | 159 | int error; |
1da177e4 LT |
160 | int idx; |
161 | ||
9fd973e0 EB |
162 | if (task_active_pid_ns(current) != &init_pid_ns) |
163 | return -EINVAL; | |
164 | ||
1da177e4 LT |
165 | idx = get_device_index((struct coda_mount_data *) data); |
166 | ||
167 | /* Ignore errors in data, for backward compatibility */ | |
168 | if(idx == -1) | |
169 | idx = 0; | |
170 | ||
6d6bd94f | 171 | pr_info("%s: device index: %i\n", __func__, idx); |
1da177e4 LT |
172 | |
173 | vc = &coda_comms[idx]; | |
da47c19e | 174 | mutex_lock(&vc->vc_mutex); |
f7cc02b8 | 175 | |
1da177e4 | 176 | if (!vc->vc_inuse) { |
6d6bd94f | 177 | pr_warn("%s: No pseudo device\n", __func__); |
f7cc02b8 YA |
178 | error = -EINVAL; |
179 | goto unlock_out; | |
1da177e4 LT |
180 | } |
181 | ||
f7cc02b8 | 182 | if (vc->vc_sb) { |
6d6bd94f | 183 | pr_warn("%s: Device already mounted\n", __func__); |
f7cc02b8 YA |
184 | error = -EBUSY; |
185 | goto unlock_out; | |
1da177e4 LT |
186 | } |
187 | ||
5163d900 JA |
188 | error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY); |
189 | if (error) | |
f7cc02b8 | 190 | goto unlock_out; |
5163d900 | 191 | |
1da177e4 | 192 | vc->vc_sb = sb; |
da47c19e | 193 | mutex_unlock(&vc->vc_mutex); |
1da177e4 | 194 | |
a1b0aa87 | 195 | sb->s_fs_info = vc; |
fac1f0e3 JH |
196 | sb->s_flags |= MS_NOATIME; |
197 | sb->s_blocksize = 4096; /* XXXXX what do we put here?? */ | |
198 | sb->s_blocksize_bits = 12; | |
199 | sb->s_magic = CODA_SUPER_MAGIC; | |
200 | sb->s_op = &coda_super_operations; | |
9501e4c4 | 201 | sb->s_d_op = &coda_dentry_operations; |
5163d900 | 202 | sb->s_bdi = &vc->bdi; |
1da177e4 LT |
203 | |
204 | /* get root fid from Venus: this needs the root inode */ | |
205 | error = venus_rootfid(sb, &fid); | |
206 | if ( error ) { | |
6d6bd94f FF |
207 | pr_warn("%s: coda_get_rootfid failed with %d\n", |
208 | __func__, error); | |
1da177e4 LT |
209 | goto error; |
210 | } | |
6d6bd94f | 211 | pr_info("%s: rootfid is %s\n", __func__, coda_f2s(&fid)); |
1da177e4 LT |
212 | |
213 | /* make root inode */ | |
f4947fbc AV |
214 | root = coda_cnode_make(&fid, sb); |
215 | if (IS_ERR(root)) { | |
216 | error = PTR_ERR(root); | |
d9b4b319 FF |
217 | pr_warn("Failure of coda_cnode_make for root: error %d\n", |
218 | error); | |
f4947fbc | 219 | goto error; |
1da177e4 LT |
220 | } |
221 | ||
6d6bd94f FF |
222 | pr_info("%s: rootinode is %ld dev %s\n", |
223 | __func__, root->i_ino, root->i_sb->s_id); | |
48fde701 | 224 | sb->s_root = d_make_root(root); |
f7cc02b8 YA |
225 | if (!sb->s_root) { |
226 | error = -EINVAL; | |
1da177e4 | 227 | goto error; |
f7cc02b8 | 228 | } |
db719222 | 229 | return 0; |
1da177e4 | 230 | |
f7cc02b8 | 231 | error: |
da47c19e | 232 | mutex_lock(&vc->vc_mutex); |
f7cc02b8 YA |
233 | bdi_destroy(&vc->bdi); |
234 | vc->vc_sb = NULL; | |
235 | sb->s_fs_info = NULL; | |
236 | unlock_out: | |
da47c19e | 237 | mutex_unlock(&vc->vc_mutex); |
f7cc02b8 | 238 | return error; |
1da177e4 LT |
239 | } |
240 | ||
241 | static void coda_put_super(struct super_block *sb) | |
242 | { | |
da47c19e YA |
243 | struct venus_comm *vcp = coda_vcp(sb); |
244 | mutex_lock(&vcp->vc_mutex); | |
245 | bdi_destroy(&vcp->bdi); | |
246 | vcp->vc_sb = NULL; | |
a1b0aa87 | 247 | sb->s_fs_info = NULL; |
da47c19e | 248 | mutex_unlock(&vcp->vc_mutex); |
1da177e4 | 249 | |
f38cfb25 | 250 | pr_info("Bye bye.\n"); |
1da177e4 LT |
251 | } |
252 | ||
b57922d9 | 253 | static void coda_evict_inode(struct inode *inode) |
1da177e4 | 254 | { |
91b0abe3 | 255 | truncate_inode_pages_final(&inode->i_data); |
dbd5768f | 256 | clear_inode(inode); |
1da177e4 LT |
257 | coda_cache_clear_inode(inode); |
258 | } | |
259 | ||
260 | int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
261 | { | |
11d100d9 | 262 | int err = coda_revalidate_inode(dentry->d_inode); |
1da177e4 LT |
263 | if (!err) |
264 | generic_fillattr(dentry->d_inode, stat); | |
265 | return err; | |
266 | } | |
267 | ||
268 | int coda_setattr(struct dentry *de, struct iattr *iattr) | |
269 | { | |
270 | struct inode *inode = de->d_inode; | |
271 | struct coda_vattr vattr; | |
272 | int error; | |
273 | ||
1da177e4 LT |
274 | memset(&vattr, 0, sizeof(vattr)); |
275 | ||
276 | inode->i_ctime = CURRENT_TIME_SEC; | |
277 | coda_iattr_to_vattr(iattr, &vattr); | |
278 | vattr.va_type = C_VNON; /* cannot set type */ | |
279 | ||
280 | /* Venus is responsible for truncating the container-file!!! */ | |
281 | error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr); | |
282 | ||
f7cc02b8 | 283 | if (!error) { |
1da177e4 LT |
284 | coda_vattr_to_iattr(inode, &vattr); |
285 | coda_cache_clear_inode(inode); | |
286 | } | |
1da177e4 LT |
287 | return error; |
288 | } | |
289 | ||
754661f1 | 290 | const struct inode_operations coda_file_inode_operations = { |
1da177e4 LT |
291 | .permission = coda_permission, |
292 | .getattr = coda_getattr, | |
293 | .setattr = coda_setattr, | |
294 | }; | |
295 | ||
726c3342 | 296 | static int coda_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 LT |
297 | { |
298 | int error; | |
299 | ||
726c3342 | 300 | error = venus_statfs(dentry, buf); |
1da177e4 | 301 | |
1da177e4 LT |
302 | if (error) { |
303 | /* fake something like AFS does */ | |
304 | buf->f_blocks = 9000000; | |
305 | buf->f_bfree = 9000000; | |
306 | buf->f_bavail = 9000000; | |
307 | buf->f_files = 9000000; | |
308 | buf->f_ffree = 9000000; | |
309 | } | |
310 | ||
311 | /* and fill in the rest */ | |
312 | buf->f_type = CODA_SUPER_MAGIC; | |
fac1f0e3 | 313 | buf->f_bsize = 4096; |
1da177e4 LT |
314 | buf->f_namelen = CODA_MAXNAMLEN; |
315 | ||
316 | return 0; | |
317 | } | |
318 | ||
319 | /* init_coda: used by filesystems.c to register coda */ | |
320 | ||
3c26ff6e AV |
321 | static struct dentry *coda_mount(struct file_system_type *fs_type, |
322 | int flags, const char *dev_name, void *data) | |
1da177e4 | 323 | { |
3c26ff6e | 324 | return mount_nodev(fs_type, flags, data, coda_fill_super); |
1da177e4 LT |
325 | } |
326 | ||
327 | struct file_system_type coda_fs_type = { | |
328 | .owner = THIS_MODULE, | |
329 | .name = "coda", | |
3c26ff6e | 330 | .mount = coda_mount, |
1da177e4 LT |
331 | .kill_sb = kill_anon_super, |
332 | .fs_flags = FS_BINARY_MOUNTDATA, | |
333 | }; | |
7f78e035 | 334 | MODULE_ALIAS_FS("coda"); |
1da177e4 | 335 |