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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 | ||
59 | static void coda_destroy_inode(struct inode *inode) | |
60 | { | |
61 | kmem_cache_free(coda_inode_cachep, ITOC(inode)); | |
62 | } | |
63 | ||
51cc5068 | 64 | static void init_once(void *foo) |
1da177e4 LT |
65 | { |
66 | struct coda_inode_info *ei = (struct coda_inode_info *) foo; | |
67 | ||
a35afb83 | 68 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 69 | } |
20c2df83 | 70 | |
1da177e4 LT |
71 | int coda_init_inodecache(void) |
72 | { | |
73 | coda_inode_cachep = kmem_cache_create("coda_inode_cache", | |
74 | sizeof(struct coda_inode_info), | |
4b6a9316 | 75 | 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, |
20c2df83 | 76 | init_once); |
1da177e4 LT |
77 | if (coda_inode_cachep == NULL) |
78 | return -ENOMEM; | |
79 | return 0; | |
80 | } | |
81 | ||
82 | void coda_destroy_inodecache(void) | |
83 | { | |
1a1d92c1 | 84 | kmem_cache_destroy(coda_inode_cachep); |
1da177e4 LT |
85 | } |
86 | ||
87 | static int coda_remount(struct super_block *sb, int *flags, char *data) | |
88 | { | |
fac1f0e3 | 89 | *flags |= MS_NOATIME; |
1da177e4 LT |
90 | return 0; |
91 | } | |
92 | ||
93 | /* exported operations */ | |
ee9b6d61 | 94 | static const struct super_operations coda_super_operations = |
1da177e4 LT |
95 | { |
96 | .alloc_inode = coda_alloc_inode, | |
97 | .destroy_inode = coda_destroy_inode, | |
b57922d9 | 98 | .evict_inode = coda_evict_inode, |
1da177e4 LT |
99 | .put_super = coda_put_super, |
100 | .statfs = coda_statfs, | |
101 | .remount_fs = coda_remount, | |
102 | }; | |
103 | ||
104 | static int get_device_index(struct coda_mount_data *data) | |
105 | { | |
106 | struct file *file; | |
107 | struct inode *inode; | |
108 | int idx; | |
109 | ||
110 | if(data == NULL) { | |
111 | printk("coda_read_super: Bad mount data\n"); | |
112 | return -1; | |
113 | } | |
114 | ||
115 | if(data->version != CODA_MOUNT_VERSION) { | |
116 | printk("coda_read_super: Bad mount version\n"); | |
117 | return -1; | |
118 | } | |
119 | ||
120 | file = fget(data->fd); | |
121 | inode = NULL; | |
122 | if(file) | |
d4176d32 | 123 | inode = file->f_path.dentry->d_inode; |
1da177e4 LT |
124 | |
125 | if(!inode || !S_ISCHR(inode->i_mode) || | |
126 | imajor(inode) != CODA_PSDEV_MAJOR) { | |
127 | if(file) | |
128 | fput(file); | |
129 | ||
130 | printk("coda_read_super: Bad file\n"); | |
131 | return -1; | |
132 | } | |
133 | ||
134 | idx = iminor(inode); | |
135 | fput(file); | |
136 | ||
137 | if(idx < 0 || idx >= MAX_CODADEVS) { | |
138 | printk("coda_read_super: Bad minor number\n"); | |
139 | return -1; | |
140 | } | |
141 | ||
142 | return idx; | |
143 | } | |
144 | ||
145 | static int coda_fill_super(struct super_block *sb, void *data, int silent) | |
146 | { | |
a1b0aa87 | 147 | struct inode *root = NULL; |
da47c19e | 148 | struct venus_comm *vc; |
1da177e4 | 149 | struct CodaFid fid; |
a1b0aa87 | 150 | int error; |
1da177e4 LT |
151 | int idx; |
152 | ||
153 | idx = get_device_index((struct coda_mount_data *) data); | |
154 | ||
155 | /* Ignore errors in data, for backward compatibility */ | |
156 | if(idx == -1) | |
157 | idx = 0; | |
158 | ||
159 | printk(KERN_INFO "coda_read_super: device index: %i\n", idx); | |
160 | ||
161 | vc = &coda_comms[idx]; | |
da47c19e | 162 | mutex_lock(&vc->vc_mutex); |
f7cc02b8 | 163 | |
1da177e4 LT |
164 | if (!vc->vc_inuse) { |
165 | printk("coda_read_super: No pseudo device\n"); | |
f7cc02b8 YA |
166 | error = -EINVAL; |
167 | goto unlock_out; | |
1da177e4 LT |
168 | } |
169 | ||
f7cc02b8 | 170 | if (vc->vc_sb) { |
1da177e4 | 171 | printk("coda_read_super: Device already mounted\n"); |
f7cc02b8 YA |
172 | error = -EBUSY; |
173 | goto unlock_out; | |
1da177e4 LT |
174 | } |
175 | ||
5163d900 JA |
176 | error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY); |
177 | if (error) | |
f7cc02b8 | 178 | goto unlock_out; |
5163d900 | 179 | |
1da177e4 | 180 | vc->vc_sb = sb; |
da47c19e | 181 | mutex_unlock(&vc->vc_mutex); |
1da177e4 | 182 | |
a1b0aa87 | 183 | sb->s_fs_info = vc; |
fac1f0e3 JH |
184 | sb->s_flags |= MS_NOATIME; |
185 | sb->s_blocksize = 4096; /* XXXXX what do we put here?? */ | |
186 | sb->s_blocksize_bits = 12; | |
187 | sb->s_magic = CODA_SUPER_MAGIC; | |
188 | sb->s_op = &coda_super_operations; | |
5163d900 | 189 | sb->s_bdi = &vc->bdi; |
1da177e4 LT |
190 | |
191 | /* get root fid from Venus: this needs the root inode */ | |
192 | error = venus_rootfid(sb, &fid); | |
193 | if ( error ) { | |
194 | printk("coda_read_super: coda_get_rootfid failed with %d\n", | |
195 | error); | |
196 | goto error; | |
197 | } | |
198 | printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid)); | |
199 | ||
200 | /* make root inode */ | |
201 | error = coda_cnode_make(&root, &fid, sb); | |
202 | if ( error || !root ) { | |
203 | printk("Failure of coda_cnode_make for root: error %d\n", error); | |
204 | goto error; | |
205 | } | |
206 | ||
207 | printk("coda_read_super: rootinode is %ld dev %s\n", | |
208 | root->i_ino, root->i_sb->s_id); | |
209 | sb->s_root = d_alloc_root(root); | |
f7cc02b8 YA |
210 | if (!sb->s_root) { |
211 | error = -EINVAL; | |
1da177e4 | 212 | goto error; |
f7cc02b8 | 213 | } |
db719222 | 214 | return 0; |
1da177e4 | 215 | |
f7cc02b8 | 216 | error: |
1da177e4 | 217 | if (root) |
a1b0aa87 | 218 | iput(root); |
1da177e4 | 219 | |
da47c19e | 220 | mutex_lock(&vc->vc_mutex); |
f7cc02b8 YA |
221 | bdi_destroy(&vc->bdi); |
222 | vc->vc_sb = NULL; | |
223 | sb->s_fs_info = NULL; | |
224 | unlock_out: | |
da47c19e | 225 | mutex_unlock(&vc->vc_mutex); |
f7cc02b8 | 226 | return error; |
1da177e4 LT |
227 | } |
228 | ||
229 | static void coda_put_super(struct super_block *sb) | |
230 | { | |
da47c19e YA |
231 | struct venus_comm *vcp = coda_vcp(sb); |
232 | mutex_lock(&vcp->vc_mutex); | |
233 | bdi_destroy(&vcp->bdi); | |
234 | vcp->vc_sb = NULL; | |
a1b0aa87 | 235 | sb->s_fs_info = NULL; |
da47c19e | 236 | mutex_unlock(&vcp->vc_mutex); |
1da177e4 LT |
237 | |
238 | printk("Coda: Bye bye.\n"); | |
1da177e4 LT |
239 | } |
240 | ||
b57922d9 | 241 | static void coda_evict_inode(struct inode *inode) |
1da177e4 | 242 | { |
b57922d9 AV |
243 | truncate_inode_pages(&inode->i_data, 0); |
244 | end_writeback(inode); | |
1da177e4 LT |
245 | coda_cache_clear_inode(inode); |
246 | } | |
247 | ||
248 | int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
249 | { | |
250 | int err = coda_revalidate_inode(dentry); | |
251 | if (!err) | |
252 | generic_fillattr(dentry->d_inode, stat); | |
253 | return err; | |
254 | } | |
255 | ||
256 | int coda_setattr(struct dentry *de, struct iattr *iattr) | |
257 | { | |
258 | struct inode *inode = de->d_inode; | |
259 | struct coda_vattr vattr; | |
260 | int error; | |
261 | ||
1da177e4 LT |
262 | memset(&vattr, 0, sizeof(vattr)); |
263 | ||
264 | inode->i_ctime = CURRENT_TIME_SEC; | |
265 | coda_iattr_to_vattr(iattr, &vattr); | |
266 | vattr.va_type = C_VNON; /* cannot set type */ | |
267 | ||
268 | /* Venus is responsible for truncating the container-file!!! */ | |
269 | error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr); | |
270 | ||
f7cc02b8 | 271 | if (!error) { |
1da177e4 LT |
272 | coda_vattr_to_iattr(inode, &vattr); |
273 | coda_cache_clear_inode(inode); | |
274 | } | |
1da177e4 LT |
275 | return error; |
276 | } | |
277 | ||
754661f1 | 278 | const struct inode_operations coda_file_inode_operations = { |
1da177e4 LT |
279 | .permission = coda_permission, |
280 | .getattr = coda_getattr, | |
281 | .setattr = coda_setattr, | |
282 | }; | |
283 | ||
726c3342 | 284 | static int coda_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 LT |
285 | { |
286 | int error; | |
287 | ||
726c3342 | 288 | error = venus_statfs(dentry, buf); |
1da177e4 | 289 | |
1da177e4 LT |
290 | if (error) { |
291 | /* fake something like AFS does */ | |
292 | buf->f_blocks = 9000000; | |
293 | buf->f_bfree = 9000000; | |
294 | buf->f_bavail = 9000000; | |
295 | buf->f_files = 9000000; | |
296 | buf->f_ffree = 9000000; | |
297 | } | |
298 | ||
299 | /* and fill in the rest */ | |
300 | buf->f_type = CODA_SUPER_MAGIC; | |
fac1f0e3 | 301 | buf->f_bsize = 4096; |
1da177e4 LT |
302 | buf->f_namelen = CODA_MAXNAMLEN; |
303 | ||
304 | return 0; | |
305 | } | |
306 | ||
307 | /* init_coda: used by filesystems.c to register coda */ | |
308 | ||
3c26ff6e AV |
309 | static struct dentry *coda_mount(struct file_system_type *fs_type, |
310 | int flags, const char *dev_name, void *data) | |
1da177e4 | 311 | { |
3c26ff6e | 312 | return mount_nodev(fs_type, flags, data, coda_fill_super); |
1da177e4 LT |
313 | } |
314 | ||
315 | struct file_system_type coda_fs_type = { | |
316 | .owner = THIS_MODULE, | |
317 | .name = "coda", | |
3c26ff6e | 318 | .mount = coda_mount, |
1da177e4 LT |
319 | .kill_sb = kill_anon_super, |
320 | .fs_flags = FS_BINARY_MOUNTDATA, | |
321 | }; | |
322 |