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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> | |
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 | ||
c98d8cfb AB |
34 | #include "coda_int.h" |
35 | ||
1da177e4 LT |
36 | /* VFS super_block ops */ |
37 | static void coda_clear_inode(struct inode *); | |
38 | static void coda_put_super(struct super_block *); | |
39 | static int coda_statfs(struct super_block *sb, struct kstatfs *buf); | |
40 | ||
41 | static kmem_cache_t * coda_inode_cachep; | |
42 | ||
43 | static struct inode *coda_alloc_inode(struct super_block *sb) | |
44 | { | |
45 | struct coda_inode_info *ei; | |
46 | ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, SLAB_KERNEL); | |
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; | |
53 | return &ei->vfs_inode; | |
54 | } | |
55 | ||
56 | static void coda_destroy_inode(struct inode *inode) | |
57 | { | |
58 | kmem_cache_free(coda_inode_cachep, ITOC(inode)); | |
59 | } | |
60 | ||
61 | static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |
62 | { | |
63 | struct coda_inode_info *ei = (struct coda_inode_info *) foo; | |
64 | ||
65 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
66 | SLAB_CTOR_CONSTRUCTOR) | |
67 | inode_init_once(&ei->vfs_inode); | |
68 | } | |
69 | ||
70 | int coda_init_inodecache(void) | |
71 | { | |
72 | coda_inode_cachep = kmem_cache_create("coda_inode_cache", | |
73 | sizeof(struct coda_inode_info), | |
74 | 0, SLAB_RECLAIM_ACCOUNT, | |
75 | init_once, NULL); | |
76 | if (coda_inode_cachep == NULL) | |
77 | return -ENOMEM; | |
78 | return 0; | |
79 | } | |
80 | ||
81 | void coda_destroy_inodecache(void) | |
82 | { | |
83 | if (kmem_cache_destroy(coda_inode_cachep)) | |
84 | printk(KERN_INFO "coda_inode_cache: not all structures were freed\n"); | |
85 | } | |
86 | ||
87 | static int coda_remount(struct super_block *sb, int *flags, char *data) | |
88 | { | |
89 | *flags |= MS_NODIRATIME; | |
90 | return 0; | |
91 | } | |
92 | ||
93 | /* exported operations */ | |
94 | static struct super_operations coda_super_operations = | |
95 | { | |
96 | .alloc_inode = coda_alloc_inode, | |
97 | .destroy_inode = coda_destroy_inode, | |
98 | .clear_inode = coda_clear_inode, | |
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) | |
123 | inode = file->f_dentry->d_inode; | |
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 | { | |
147 | struct inode *root = NULL; | |
148 | struct coda_sb_info *sbi = NULL; | |
149 | struct venus_comm *vc = NULL; | |
150 | struct CodaFid fid; | |
151 | int error; | |
152 | int idx; | |
153 | ||
154 | idx = get_device_index((struct coda_mount_data *) data); | |
155 | ||
156 | /* Ignore errors in data, for backward compatibility */ | |
157 | if(idx == -1) | |
158 | idx = 0; | |
159 | ||
160 | printk(KERN_INFO "coda_read_super: device index: %i\n", idx); | |
161 | ||
162 | vc = &coda_comms[idx]; | |
163 | if (!vc->vc_inuse) { | |
164 | printk("coda_read_super: No pseudo device\n"); | |
165 | return -EINVAL; | |
166 | } | |
167 | ||
168 | if ( vc->vc_sb ) { | |
169 | printk("coda_read_super: Device already mounted\n"); | |
170 | return -EBUSY; | |
171 | } | |
172 | ||
173 | sbi = kmalloc(sizeof(struct coda_sb_info), GFP_KERNEL); | |
174 | if(!sbi) { | |
175 | return -ENOMEM; | |
176 | } | |
177 | ||
178 | vc->vc_sb = sb; | |
179 | ||
180 | sbi->sbi_vcomm = vc; | |
181 | ||
182 | sb->s_fs_info = sbi; | |
183 | sb->s_flags |= MS_NODIRATIME; /* probably even noatime */ | |
184 | sb->s_blocksize = 1024; /* XXXXX what do we put here?? */ | |
185 | sb->s_blocksize_bits = 10; | |
186 | sb->s_magic = CODA_SUPER_MAGIC; | |
187 | sb->s_op = &coda_super_operations; | |
188 | ||
189 | /* get root fid from Venus: this needs the root inode */ | |
190 | error = venus_rootfid(sb, &fid); | |
191 | if ( error ) { | |
192 | printk("coda_read_super: coda_get_rootfid failed with %d\n", | |
193 | error); | |
194 | goto error; | |
195 | } | |
196 | printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid)); | |
197 | ||
198 | /* make root inode */ | |
199 | error = coda_cnode_make(&root, &fid, sb); | |
200 | if ( error || !root ) { | |
201 | printk("Failure of coda_cnode_make for root: error %d\n", error); | |
202 | goto error; | |
203 | } | |
204 | ||
205 | printk("coda_read_super: rootinode is %ld dev %s\n", | |
206 | root->i_ino, root->i_sb->s_id); | |
207 | sb->s_root = d_alloc_root(root); | |
208 | if (!sb->s_root) | |
209 | goto error; | |
210 | return 0; | |
211 | ||
212 | error: | |
213 | if (sbi) { | |
214 | kfree(sbi); | |
215 | if(vc) | |
216 | vc->vc_sb = NULL; | |
217 | } | |
218 | if (root) | |
219 | iput(root); | |
220 | ||
221 | return -EINVAL; | |
222 | } | |
223 | ||
224 | static void coda_put_super(struct super_block *sb) | |
225 | { | |
226 | struct coda_sb_info *sbi; | |
227 | ||
228 | sbi = coda_sbp(sb); | |
229 | sbi->sbi_vcomm->vc_sb = NULL; | |
230 | ||
231 | printk("Coda: Bye bye.\n"); | |
232 | kfree(sbi); | |
233 | } | |
234 | ||
235 | static void coda_clear_inode(struct inode *inode) | |
236 | { | |
237 | coda_cache_clear_inode(inode); | |
238 | } | |
239 | ||
240 | int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) | |
241 | { | |
242 | int err = coda_revalidate_inode(dentry); | |
243 | if (!err) | |
244 | generic_fillattr(dentry->d_inode, stat); | |
245 | return err; | |
246 | } | |
247 | ||
248 | int coda_setattr(struct dentry *de, struct iattr *iattr) | |
249 | { | |
250 | struct inode *inode = de->d_inode; | |
251 | struct coda_vattr vattr; | |
252 | int error; | |
253 | ||
254 | lock_kernel(); | |
255 | ||
256 | memset(&vattr, 0, sizeof(vattr)); | |
257 | ||
258 | inode->i_ctime = CURRENT_TIME_SEC; | |
259 | coda_iattr_to_vattr(iattr, &vattr); | |
260 | vattr.va_type = C_VNON; /* cannot set type */ | |
261 | ||
262 | /* Venus is responsible for truncating the container-file!!! */ | |
263 | error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr); | |
264 | ||
265 | if ( !error ) { | |
266 | coda_vattr_to_iattr(inode, &vattr); | |
267 | coda_cache_clear_inode(inode); | |
268 | } | |
269 | ||
270 | unlock_kernel(); | |
271 | ||
272 | return error; | |
273 | } | |
274 | ||
275 | struct inode_operations coda_file_inode_operations = { | |
276 | .permission = coda_permission, | |
277 | .getattr = coda_getattr, | |
278 | .setattr = coda_setattr, | |
279 | }; | |
280 | ||
281 | static int coda_statfs(struct super_block *sb, struct kstatfs *buf) | |
282 | { | |
283 | int error; | |
284 | ||
285 | lock_kernel(); | |
286 | ||
287 | error = venus_statfs(sb, buf); | |
288 | ||
289 | unlock_kernel(); | |
290 | ||
291 | if (error) { | |
292 | /* fake something like AFS does */ | |
293 | buf->f_blocks = 9000000; | |
294 | buf->f_bfree = 9000000; | |
295 | buf->f_bavail = 9000000; | |
296 | buf->f_files = 9000000; | |
297 | buf->f_ffree = 9000000; | |
298 | } | |
299 | ||
300 | /* and fill in the rest */ | |
301 | buf->f_type = CODA_SUPER_MAGIC; | |
302 | buf->f_bsize = 1024; | |
303 | buf->f_namelen = CODA_MAXNAMLEN; | |
304 | ||
305 | return 0; | |
306 | } | |
307 | ||
308 | /* init_coda: used by filesystems.c to register coda */ | |
309 | ||
310 | static struct super_block *coda_get_sb(struct file_system_type *fs_type, | |
311 | int flags, const char *dev_name, void *data) | |
312 | { | |
313 | return get_sb_nodev(fs_type, flags, data, coda_fill_super); | |
314 | } | |
315 | ||
316 | struct file_system_type coda_fs_type = { | |
317 | .owner = THIS_MODULE, | |
318 | .name = "coda", | |
319 | .get_sb = coda_get_sb, | |
320 | .kill_sb = kill_anon_super, | |
321 | .fs_flags = FS_BINARY_MOUNTDATA, | |
322 | }; | |
323 |