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> | |
18 | #include <linux/smp_lock.h> | |
19 | #include <linux/file.h> | |
20 | #include <linux/vfs.h> | |
21 | ||
22 | #include <asm/system.h> | |
23 | #include <asm/uaccess.h> | |
24 | ||
25 | #include <linux/fs.h> | |
26 | #include <linux/vmalloc.h> | |
27 | ||
28 | #include <linux/coda.h> | |
29 | #include <linux/coda_linux.h> | |
30 | #include <linux/coda_psdev.h> | |
31 | #include <linux/coda_fs_i.h> | |
32 | #include <linux/coda_cache.h> | |
33 | ||
34 | /* VFS super_block ops */ | |
35 | static void coda_clear_inode(struct inode *); | |
36 | static void coda_put_super(struct super_block *); | |
37 | static int coda_statfs(struct super_block *sb, struct kstatfs *buf); | |
38 | ||
39 | static kmem_cache_t * coda_inode_cachep; | |
40 | ||
41 | static struct inode *coda_alloc_inode(struct super_block *sb) | |
42 | { | |
43 | struct coda_inode_info *ei; | |
44 | ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, SLAB_KERNEL); | |
45 | if (!ei) | |
46 | return NULL; | |
47 | memset(&ei->c_fid, 0, sizeof(struct CodaFid)); | |
48 | ei->c_flags = 0; | |
49 | ei->c_uid = 0; | |
50 | ei->c_cached_perm = 0; | |
51 | return &ei->vfs_inode; | |
52 | } | |
53 | ||
54 | static void coda_destroy_inode(struct inode *inode) | |
55 | { | |
56 | kmem_cache_free(coda_inode_cachep, ITOC(inode)); | |
57 | } | |
58 | ||
59 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |
60 | { | |
61 | struct coda_inode_info *ei = (struct coda_inode_info *) foo; | |
62 | ||
63 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
64 | SLAB_CTOR_CONSTRUCTOR) | |
65 | inode_init_once(&ei->vfs_inode); | |
66 | } | |
67 | ||
68 | int coda_init_inodecache(void) | |
69 | { | |
70 | coda_inode_cachep = kmem_cache_create("coda_inode_cache", | |
71 | sizeof(struct coda_inode_info), | |
72 | 0, SLAB_RECLAIM_ACCOUNT, | |
73 | init_once, NULL); | |
74 | if (coda_inode_cachep == NULL) | |
75 | return -ENOMEM; | |
76 | return 0; | |
77 | } | |
78 | ||
79 | void coda_destroy_inodecache(void) | |
80 | { | |
81 | if (kmem_cache_destroy(coda_inode_cachep)) | |
82 | printk(KERN_INFO "coda_inode_cache: not all structures were freed\n"); | |
83 | } | |
84 | ||
85 | static int coda_remount(struct super_block *sb, int *flags, char *data) | |
86 | { | |
87 | *flags |= MS_NODIRATIME; | |
88 | return 0; | |
89 | } | |
90 | ||
91 | /* exported operations */ | |
92 | static struct super_operations coda_super_operations = | |
93 | { | |
94 | .alloc_inode = coda_alloc_inode, | |
95 | .destroy_inode = coda_destroy_inode, | |
96 | .clear_inode = coda_clear_inode, | |
97 | .put_super = coda_put_super, | |
98 | .statfs = coda_statfs, | |
99 | .remount_fs = coda_remount, | |
100 | }; | |
101 | ||
102 | static int get_device_index(struct coda_mount_data *data) | |
103 | { | |
104 | struct file *file; | |
105 | struct inode *inode; | |
106 | int idx; | |
107 | ||
108 | if(data == NULL) { | |
109 | printk("coda_read_super: Bad mount data\n"); | |
110 | return -1; | |
111 | } | |
112 | ||
113 | if(data->version != CODA_MOUNT_VERSION) { | |
114 | printk("coda_read_super: Bad mount version\n"); | |
115 | return -1; | |
116 | } | |
117 | ||
118 | file = fget(data->fd); | |
119 | inode = NULL; | |
120 | if(file) | |
121 | inode = file->f_dentry->d_inode; | |
122 | ||
123 | if(!inode || !S_ISCHR(inode->i_mode) || | |
124 | imajor(inode) != CODA_PSDEV_MAJOR) { | |
125 | if(file) | |
126 | fput(file); | |
127 | ||
128 | printk("coda_read_super: Bad file\n"); | |
129 | return -1; | |
130 | } | |
131 | ||
132 | idx = iminor(inode); | |
133 | fput(file); | |
134 | ||
135 | if(idx < 0 || idx >= MAX_CODADEVS) { | |
136 | printk("coda_read_super: Bad minor number\n"); | |
137 | return -1; | |
138 | } | |
139 | ||
140 | return idx; | |
141 | } | |
142 | ||
143 | static int coda_fill_super(struct super_block *sb, void *data, int silent) | |
144 | { | |
145 | struct inode *root = NULL; | |
146 | struct coda_sb_info *sbi = NULL; | |
147 | struct venus_comm *vc = NULL; | |
148 | struct CodaFid fid; | |
149 | int error; | |
150 | int idx; | |
151 | ||
152 | idx = get_device_index((struct coda_mount_data *) data); | |
153 | ||
154 | /* Ignore errors in data, for backward compatibility */ | |
155 | if(idx == -1) | |
156 | idx = 0; | |
157 | ||
158 | printk(KERN_INFO "coda_read_super: device index: %i\n", idx); | |
159 | ||
160 | vc = &coda_comms[idx]; | |
161 | if (!vc->vc_inuse) { | |
162 | printk("coda_read_super: No pseudo device\n"); | |
163 | return -EINVAL; | |
164 | } | |
165 | ||
166 | if ( vc->vc_sb ) { | |
167 | printk("coda_read_super: Device already mounted\n"); | |
168 | return -EBUSY; | |
169 | } | |
170 | ||
171 | sbi = kmalloc(sizeof(struct coda_sb_info), GFP_KERNEL); | |
172 | if(!sbi) { | |
173 | return -ENOMEM; | |
174 | } | |
175 | ||
176 | vc->vc_sb = sb; | |
177 | ||
178 | sbi->sbi_vcomm = vc; | |
179 | ||
180 | sb->s_fs_info = sbi; | |
181 | sb->s_flags |= MS_NODIRATIME; /* probably even noatime */ | |
182 | sb->s_blocksize = 1024; /* XXXXX what do we put here?? */ | |
183 | sb->s_blocksize_bits = 10; | |
184 | sb->s_magic = CODA_SUPER_MAGIC; | |
185 | sb->s_op = &coda_super_operations; | |
186 | ||
187 | /* get root fid from Venus: this needs the root inode */ | |
188 | error = venus_rootfid(sb, &fid); | |
189 | if ( error ) { | |
190 | printk("coda_read_super: coda_get_rootfid failed with %d\n", | |
191 | error); | |
192 | goto error; | |
193 | } | |
194 | printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid)); | |
195 | ||
196 | /* make root inode */ | |
197 | error = coda_cnode_make(&root, &fid, sb); | |
198 | if ( error || !root ) { | |
199 | printk("Failure of coda_cnode_make for root: error %d\n", error); | |
200 | goto error; | |
201 | } | |
202 | ||
203 | printk("coda_read_super: rootinode is %ld dev %s\n", | |
204 | root->i_ino, root->i_sb->s_id); | |
205 | sb->s_root = d_alloc_root(root); | |
206 | if (!sb->s_root) | |
207 | goto error; | |
208 | return 0; | |
209 | ||
210 | error: | |
211 | if (sbi) { | |
212 | kfree(sbi); | |
213 | if(vc) | |
214 | vc->vc_sb = NULL; | |
215 | } | |
216 | if (root) | |
217 | iput(root); | |
218 | ||
219 | return -EINVAL; | |
220 | } | |
221 | ||
222 | static void coda_put_super(struct super_block *sb) | |
223 | { | |
224 | struct coda_sb_info *sbi; | |
225 | ||
226 | sbi = coda_sbp(sb); | |
227 | sbi->sbi_vcomm->vc_sb = NULL; | |
228 | ||
229 | printk("Coda: Bye bye.\n"); | |
230 | kfree(sbi); | |
231 | } | |
232 | ||
233 | static void coda_clear_inode(struct inode *inode) | |
234 | { | |
235 | coda_cache_clear_inode(inode); | |
236 | } | |
237 | ||
238 | int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
239 | { | |
240 | int err = coda_revalidate_inode(dentry); | |
241 | if (!err) | |
242 | generic_fillattr(dentry->d_inode, stat); | |
243 | return err; | |
244 | } | |
245 | ||
246 | int coda_setattr(struct dentry *de, struct iattr *iattr) | |
247 | { | |
248 | struct inode *inode = de->d_inode; | |
249 | struct coda_vattr vattr; | |
250 | int error; | |
251 | ||
252 | lock_kernel(); | |
253 | ||
254 | memset(&vattr, 0, sizeof(vattr)); | |
255 | ||
256 | inode->i_ctime = CURRENT_TIME_SEC; | |
257 | coda_iattr_to_vattr(iattr, &vattr); | |
258 | vattr.va_type = C_VNON; /* cannot set type */ | |
259 | ||
260 | /* Venus is responsible for truncating the container-file!!! */ | |
261 | error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr); | |
262 | ||
263 | if ( !error ) { | |
264 | coda_vattr_to_iattr(inode, &vattr); | |
265 | coda_cache_clear_inode(inode); | |
266 | } | |
267 | ||
268 | unlock_kernel(); | |
269 | ||
270 | return error; | |
271 | } | |
272 | ||
273 | struct inode_operations coda_file_inode_operations = { | |
274 | .permission = coda_permission, | |
275 | .getattr = coda_getattr, | |
276 | .setattr = coda_setattr, | |
277 | }; | |
278 | ||
279 | static int coda_statfs(struct super_block *sb, struct kstatfs *buf) | |
280 | { | |
281 | int error; | |
282 | ||
283 | lock_kernel(); | |
284 | ||
285 | error = venus_statfs(sb, buf); | |
286 | ||
287 | unlock_kernel(); | |
288 | ||
289 | if (error) { | |
290 | /* fake something like AFS does */ | |
291 | buf->f_blocks = 9000000; | |
292 | buf->f_bfree = 9000000; | |
293 | buf->f_bavail = 9000000; | |
294 | buf->f_files = 9000000; | |
295 | buf->f_ffree = 9000000; | |
296 | } | |
297 | ||
298 | /* and fill in the rest */ | |
299 | buf->f_type = CODA_SUPER_MAGIC; | |
300 | buf->f_bsize = 1024; | |
301 | buf->f_namelen = CODA_MAXNAMLEN; | |
302 | ||
303 | return 0; | |
304 | } | |
305 | ||
306 | /* init_coda: used by filesystems.c to register coda */ | |
307 | ||
308 | static struct super_block *coda_get_sb(struct file_system_type *fs_type, | |
309 | int flags, const char *dev_name, void *data) | |
310 | { | |
311 | return get_sb_nodev(fs_type, flags, data, coda_fill_super); | |
312 | } | |
313 | ||
314 | struct file_system_type coda_fs_type = { | |
315 | .owner = THIS_MODULE, | |
316 | .name = "coda", | |
317 | .get_sb = coda_get_sb, | |
318 | .kill_sb = kill_anon_super, | |
319 | .fs_flags = FS_BINARY_MOUNTDATA, | |
320 | }; | |
321 |