xref: /openbmc/linux/fs/coda/inode.c (revision d5cb9783536a41df9f9cba5b0a1d78047ed787f7)
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 
322