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> |
1da177e4 | 23 | |
1da177e4 LT |
24 | #include <asm/uaccess.h> |
25 | ||
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; | |
51 | ei->c_uid = 0; | |
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 | |
1da177e4 LT |
75 | int coda_init_inodecache(void) |
76 | { | |
77 | coda_inode_cachep = kmem_cache_create("coda_inode_cache", | |
78 | sizeof(struct coda_inode_info), | |
4b6a9316 | 79 | 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, |
20c2df83 | 80 | 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 | { | |
1a1d92c1 | 88 | kmem_cache_destroy(coda_inode_cachep); |
1da177e4 LT |
89 | } |
90 | ||
91 | static int coda_remount(struct super_block *sb, int *flags, char *data) | |
92 | { | |
fac1f0e3 | 93 | *flags |= MS_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, | |
101 | .destroy_inode = coda_destroy_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 | { | |
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) | |
d4176d32 | 127 | inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
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 | ||
149 | static int coda_fill_super(struct super_block *sb, void *data, int silent) | |
150 | { | |
a1b0aa87 | 151 | struct inode *root = NULL; |
da47c19e | 152 | struct venus_comm *vc; |
1da177e4 | 153 | struct CodaFid fid; |
a1b0aa87 | 154 | int error; |
1da177e4 LT |
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]; | |
da47c19e | 166 | mutex_lock(&vc->vc_mutex); |
f7cc02b8 | 167 | |
1da177e4 LT |
168 | if (!vc->vc_inuse) { |
169 | printk("coda_read_super: No pseudo device\n"); | |
f7cc02b8 YA |
170 | error = -EINVAL; |
171 | goto unlock_out; | |
1da177e4 LT |
172 | } |
173 | ||
f7cc02b8 | 174 | if (vc->vc_sb) { |
1da177e4 | 175 | printk("coda_read_super: Device already mounted\n"); |
f7cc02b8 YA |
176 | error = -EBUSY; |
177 | goto unlock_out; | |
1da177e4 LT |
178 | } |
179 | ||
5163d900 JA |
180 | error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY); |
181 | if (error) | |
f7cc02b8 | 182 | goto unlock_out; |
5163d900 | 183 | |
1da177e4 | 184 | vc->vc_sb = sb; |
da47c19e | 185 | mutex_unlock(&vc->vc_mutex); |
1da177e4 | 186 | |
a1b0aa87 | 187 | sb->s_fs_info = vc; |
fac1f0e3 JH |
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; | |
9501e4c4 | 193 | sb->s_d_op = &coda_dentry_operations; |
5163d900 | 194 | sb->s_bdi = &vc->bdi; |
1da177e4 LT |
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 */ | |
f4947fbc AV |
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); | |
f4947fbc | 210 | goto error; |
1da177e4 LT |
211 | } |
212 | ||
213 | printk("coda_read_super: rootinode is %ld dev %s\n", | |
214 | root->i_ino, root->i_sb->s_id); | |
48fde701 | 215 | sb->s_root = d_make_root(root); |
f7cc02b8 YA |
216 | if (!sb->s_root) { |
217 | error = -EINVAL; | |
1da177e4 | 218 | goto error; |
f7cc02b8 | 219 | } |
db719222 | 220 | return 0; |
1da177e4 | 221 | |
f7cc02b8 | 222 | error: |
da47c19e | 223 | mutex_lock(&vc->vc_mutex); |
f7cc02b8 YA |
224 | bdi_destroy(&vc->bdi); |
225 | vc->vc_sb = NULL; | |
226 | sb->s_fs_info = NULL; | |
227 | unlock_out: | |
da47c19e | 228 | mutex_unlock(&vc->vc_mutex); |
f7cc02b8 | 229 | return error; |
1da177e4 LT |
230 | } |
231 | ||
232 | static void coda_put_super(struct super_block *sb) | |
233 | { | |
da47c19e YA |
234 | struct venus_comm *vcp = coda_vcp(sb); |
235 | mutex_lock(&vcp->vc_mutex); | |
236 | bdi_destroy(&vcp->bdi); | |
237 | vcp->vc_sb = NULL; | |
a1b0aa87 | 238 | sb->s_fs_info = NULL; |
da47c19e | 239 | mutex_unlock(&vcp->vc_mutex); |
1da177e4 LT |
240 | |
241 | printk("Coda: Bye bye.\n"); | |
1da177e4 LT |
242 | } |
243 | ||
b57922d9 | 244 | static void coda_evict_inode(struct inode *inode) |
1da177e4 | 245 | { |
b57922d9 | 246 | truncate_inode_pages(&inode->i_data, 0); |
dbd5768f | 247 | clear_inode(inode); |
1da177e4 LT |
248 | coda_cache_clear_inode(inode); |
249 | } | |
250 | ||
251 | int 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 | ||
259 | int 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 | ||
1da177e4 LT |
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 | ||
f7cc02b8 | 274 | if (!error) { |
1da177e4 LT |
275 | coda_vattr_to_iattr(inode, &vattr); |
276 | coda_cache_clear_inode(inode); | |
277 | } | |
1da177e4 LT |
278 | return error; |
279 | } | |
280 | ||
754661f1 | 281 | const struct inode_operations coda_file_inode_operations = { |
1da177e4 LT |
282 | .permission = coda_permission, |
283 | .getattr = coda_getattr, | |
284 | .setattr = coda_setattr, | |
285 | }; | |
286 | ||
726c3342 | 287 | static int coda_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 LT |
288 | { |
289 | int error; | |
290 | ||
726c3342 | 291 | error = venus_statfs(dentry, buf); |
1da177e4 | 292 | |
1da177e4 LT |
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; | |
fac1f0e3 | 304 | buf->f_bsize = 4096; |
1da177e4 LT |
305 | buf->f_namelen = CODA_MAXNAMLEN; |
306 | ||
307 | return 0; | |
308 | } | |
309 | ||
310 | /* init_coda: used by filesystems.c to register coda */ | |
311 | ||
3c26ff6e AV |
312 | static struct dentry *coda_mount(struct file_system_type *fs_type, |
313 | int flags, const char *dev_name, void *data) | |
1da177e4 | 314 | { |
3c26ff6e | 315 | return mount_nodev(fs_type, flags, data, coda_fill_super); |
1da177e4 LT |
316 | } |
317 | ||
318 | struct file_system_type coda_fs_type = { | |
319 | .owner = THIS_MODULE, | |
320 | .name = "coda", | |
3c26ff6e | 321 | .mount = coda_mount, |
1da177e4 LT |
322 | .kill_sb = kill_anon_super, |
323 | .fs_flags = FS_BINARY_MOUNTDATA, | |
324 | }; | |
325 |