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Commit | Line | Data |
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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 LT |
23 | |
24 | #include <asm/system.h> | |
25 | #include <asm/uaccess.h> | |
26 | ||
27 | #include <linux/fs.h> | |
28 | #include <linux/vmalloc.h> | |
29 | ||
30 | #include <linux/coda.h> | |
31 | #include <linux/coda_linux.h> | |
32 | #include <linux/coda_psdev.h> | |
33 | #include <linux/coda_fs_i.h> | |
34 | #include <linux/coda_cache.h> | |
35 | ||
c98d8cfb AB |
36 | #include "coda_int.h" |
37 | ||
1da177e4 | 38 | /* VFS super_block ops */ |
b57922d9 | 39 | static void coda_evict_inode(struct inode *); |
1da177e4 | 40 | static void coda_put_super(struct super_block *); |
726c3342 | 41 | static int coda_statfs(struct dentry *dentry, struct kstatfs *buf); |
1da177e4 | 42 | |
e18b890b | 43 | static struct kmem_cache * coda_inode_cachep; |
1da177e4 LT |
44 | |
45 | static struct inode *coda_alloc_inode(struct super_block *sb) | |
46 | { | |
47 | struct coda_inode_info *ei; | |
e94b1766 | 48 | ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
49 | if (!ei) |
50 | return NULL; | |
51 | memset(&ei->c_fid, 0, sizeof(struct CodaFid)); | |
52 | ei->c_flags = 0; | |
53 | ei->c_uid = 0; | |
54 | ei->c_cached_perm = 0; | |
b5ce1d83 | 55 | spin_lock_init(&ei->c_lock); |
1da177e4 LT |
56 | return &ei->vfs_inode; |
57 | } | |
58 | ||
fa0d7e3d | 59 | static void coda_i_callback(struct rcu_head *head) |
1da177e4 | 60 | { |
fa0d7e3d NP |
61 | struct inode *inode = container_of(head, struct inode, i_rcu); |
62 | INIT_LIST_HEAD(&inode->i_dentry); | |
1da177e4 LT |
63 | kmem_cache_free(coda_inode_cachep, ITOC(inode)); |
64 | } | |
65 | ||
fa0d7e3d NP |
66 | static void coda_destroy_inode(struct inode *inode) |
67 | { | |
68 | call_rcu(&inode->i_rcu, coda_i_callback); | |
69 | } | |
70 | ||
51cc5068 | 71 | static void init_once(void *foo) |
1da177e4 LT |
72 | { |
73 | struct coda_inode_info *ei = (struct coda_inode_info *) foo; | |
74 | ||
a35afb83 | 75 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 76 | } |
20c2df83 | 77 | |
1da177e4 LT |
78 | int coda_init_inodecache(void) |
79 | { | |
80 | coda_inode_cachep = kmem_cache_create("coda_inode_cache", | |
81 | sizeof(struct coda_inode_info), | |
4b6a9316 | 82 | 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, |
20c2df83 | 83 | init_once); |
1da177e4 LT |
84 | if (coda_inode_cachep == NULL) |
85 | return -ENOMEM; | |
86 | return 0; | |
87 | } | |
88 | ||
89 | void coda_destroy_inodecache(void) | |
90 | { | |
1a1d92c1 | 91 | kmem_cache_destroy(coda_inode_cachep); |
1da177e4 LT |
92 | } |
93 | ||
94 | static int coda_remount(struct super_block *sb, int *flags, char *data) | |
95 | { | |
fac1f0e3 | 96 | *flags |= MS_NOATIME; |
1da177e4 LT |
97 | return 0; |
98 | } | |
99 | ||
100 | /* exported operations */ | |
ee9b6d61 | 101 | static const struct super_operations coda_super_operations = |
1da177e4 LT |
102 | { |
103 | .alloc_inode = coda_alloc_inode, | |
104 | .destroy_inode = coda_destroy_inode, | |
b57922d9 | 105 | .evict_inode = coda_evict_inode, |
1da177e4 LT |
106 | .put_super = coda_put_super, |
107 | .statfs = coda_statfs, | |
108 | .remount_fs = coda_remount, | |
109 | }; | |
110 | ||
111 | static int get_device_index(struct coda_mount_data *data) | |
112 | { | |
113 | struct file *file; | |
114 | struct inode *inode; | |
115 | int idx; | |
116 | ||
117 | if(data == NULL) { | |
118 | printk("coda_read_super: Bad mount data\n"); | |
119 | return -1; | |
120 | } | |
121 | ||
122 | if(data->version != CODA_MOUNT_VERSION) { | |
123 | printk("coda_read_super: Bad mount version\n"); | |
124 | return -1; | |
125 | } | |
126 | ||
127 | file = fget(data->fd); | |
128 | inode = NULL; | |
129 | if(file) | |
d4176d32 | 130 | inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
131 | |
132 | if(!inode || !S_ISCHR(inode->i_mode) || | |
133 | imajor(inode) != CODA_PSDEV_MAJOR) { | |
134 | if(file) | |
135 | fput(file); | |
136 | ||
137 | printk("coda_read_super: Bad file\n"); | |
138 | return -1; | |
139 | } | |
140 | ||
141 | idx = iminor(inode); | |
142 | fput(file); | |
143 | ||
144 | if(idx < 0 || idx >= MAX_CODADEVS) { | |
145 | printk("coda_read_super: Bad minor number\n"); | |
146 | return -1; | |
147 | } | |
148 | ||
149 | return idx; | |
150 | } | |
151 | ||
152 | static int coda_fill_super(struct super_block *sb, void *data, int silent) | |
153 | { | |
a1b0aa87 | 154 | struct inode *root = NULL; |
da47c19e | 155 | struct venus_comm *vc; |
1da177e4 | 156 | struct CodaFid fid; |
a1b0aa87 | 157 | int error; |
1da177e4 LT |
158 | int idx; |
159 | ||
160 | idx = get_device_index((struct coda_mount_data *) data); | |
161 | ||
162 | /* Ignore errors in data, for backward compatibility */ | |
163 | if(idx == -1) | |
164 | idx = 0; | |
165 | ||
166 | printk(KERN_INFO "coda_read_super: device index: %i\n", idx); | |
167 | ||
168 | vc = &coda_comms[idx]; | |
da47c19e | 169 | mutex_lock(&vc->vc_mutex); |
f7cc02b8 | 170 | |
1da177e4 LT |
171 | if (!vc->vc_inuse) { |
172 | printk("coda_read_super: No pseudo device\n"); | |
f7cc02b8 YA |
173 | error = -EINVAL; |
174 | goto unlock_out; | |
1da177e4 LT |
175 | } |
176 | ||
f7cc02b8 | 177 | if (vc->vc_sb) { |
1da177e4 | 178 | printk("coda_read_super: Device already mounted\n"); |
f7cc02b8 YA |
179 | error = -EBUSY; |
180 | goto unlock_out; | |
1da177e4 LT |
181 | } |
182 | ||
5163d900 JA |
183 | error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY); |
184 | if (error) | |
f7cc02b8 | 185 | goto unlock_out; |
5163d900 | 186 | |
1da177e4 | 187 | vc->vc_sb = sb; |
da47c19e | 188 | mutex_unlock(&vc->vc_mutex); |
1da177e4 | 189 | |
a1b0aa87 | 190 | sb->s_fs_info = vc; |
fac1f0e3 JH |
191 | sb->s_flags |= MS_NOATIME; |
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; | |
5163d900 | 196 | sb->s_bdi = &vc->bdi; |
1da177e4 LT |
197 | |
198 | /* get root fid from Venus: this needs the root inode */ | |
199 | error = venus_rootfid(sb, &fid); | |
200 | if ( error ) { | |
201 | printk("coda_read_super: coda_get_rootfid failed with %d\n", | |
202 | error); | |
203 | goto error; | |
204 | } | |
205 | printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid)); | |
206 | ||
207 | /* make root inode */ | |
208 | error = coda_cnode_make(&root, &fid, sb); | |
209 | if ( error || !root ) { | |
210 | printk("Failure of coda_cnode_make for root: error %d\n", error); | |
211 | goto error; | |
212 | } | |
213 | ||
214 | printk("coda_read_super: rootinode is %ld dev %s\n", | |
215 | root->i_ino, root->i_sb->s_id); | |
216 | sb->s_root = d_alloc_root(root); | |
f7cc02b8 YA |
217 | if (!sb->s_root) { |
218 | error = -EINVAL; | |
1da177e4 | 219 | goto error; |
f7cc02b8 | 220 | } |
db719222 | 221 | return 0; |
1da177e4 | 222 | |
f7cc02b8 | 223 | error: |
1da177e4 | 224 | if (root) |
a1b0aa87 | 225 | iput(root); |
1da177e4 | 226 | |
da47c19e | 227 | mutex_lock(&vc->vc_mutex); |
f7cc02b8 YA |
228 | bdi_destroy(&vc->bdi); |
229 | vc->vc_sb = NULL; | |
230 | sb->s_fs_info = NULL; | |
231 | unlock_out: | |
da47c19e | 232 | mutex_unlock(&vc->vc_mutex); |
f7cc02b8 | 233 | return error; |
1da177e4 LT |
234 | } |
235 | ||
236 | static void coda_put_super(struct super_block *sb) | |
237 | { | |
da47c19e YA |
238 | struct venus_comm *vcp = coda_vcp(sb); |
239 | mutex_lock(&vcp->vc_mutex); | |
240 | bdi_destroy(&vcp->bdi); | |
241 | vcp->vc_sb = NULL; | |
a1b0aa87 | 242 | sb->s_fs_info = NULL; |
da47c19e | 243 | mutex_unlock(&vcp->vc_mutex); |
1da177e4 LT |
244 | |
245 | printk("Coda: Bye bye.\n"); | |
1da177e4 LT |
246 | } |
247 | ||
b57922d9 | 248 | static void coda_evict_inode(struct inode *inode) |
1da177e4 | 249 | { |
b57922d9 AV |
250 | truncate_inode_pages(&inode->i_data, 0); |
251 | end_writeback(inode); | |
1da177e4 LT |
252 | coda_cache_clear_inode(inode); |
253 | } | |
254 | ||
255 | int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
256 | { | |
257 | int err = coda_revalidate_inode(dentry); | |
258 | if (!err) | |
259 | generic_fillattr(dentry->d_inode, stat); | |
260 | return err; | |
261 | } | |
262 | ||
263 | int coda_setattr(struct dentry *de, struct iattr *iattr) | |
264 | { | |
265 | struct inode *inode = de->d_inode; | |
266 | struct coda_vattr vattr; | |
267 | int error; | |
268 | ||
1da177e4 LT |
269 | memset(&vattr, 0, sizeof(vattr)); |
270 | ||
271 | inode->i_ctime = CURRENT_TIME_SEC; | |
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 | }; | |
329 |