xref: /openbmc/linux/fs/coda/inode.c (revision 64c70b1c) 
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 #include "coda_int.h"
35 
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 dentry *dentry, struct kstatfs *buf);
40 
41 static struct kmem_cache * 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, GFP_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, struct kmem_cache * cachep, unsigned long flags)
62 {
63 	struct coda_inode_info *ei = (struct coda_inode_info *) foo;
64 
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|SLAB_MEM_SPREAD,
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 	kmem_cache_destroy(coda_inode_cachep);
82 }
83 
84 static int coda_remount(struct super_block *sb, int *flags, char *data)
85 {
86 	*flags |= MS_NODIRATIME;
87 	return 0;
88 }
89 
90 /* exported operations */
91 static const struct super_operations coda_super_operations =
92 {
93 	.alloc_inode	= coda_alloc_inode,
94 	.destroy_inode	= coda_destroy_inode,
95 	.clear_inode	= coda_clear_inode,
96 	.put_super	= coda_put_super,
97 	.statfs		= coda_statfs,
98 	.remount_fs	= coda_remount,
99 };
100 
101 static int get_device_index(struct coda_mount_data *data)
102 {
103 	struct file *file;
104 	struct inode *inode;
105 	int idx;
106 
107 	if(data == NULL) {
108 		printk("coda_read_super: Bad mount data\n");
109 		return -1;
110 	}
111 
112 	if(data->version != CODA_MOUNT_VERSION) {
113 		printk("coda_read_super: Bad mount version\n");
114 		return -1;
115 	}
116 
117 	file = fget(data->fd);
118 	inode = NULL;
119 	if(file)
120 		inode = file->f_path.dentry->d_inode;
121 
122 	if(!inode || !S_ISCHR(inode->i_mode) ||
123 	   imajor(inode) != CODA_PSDEV_MAJOR) {
124 		if(file)
125 			fput(file);
126 
127 		printk("coda_read_super: Bad file\n");
128 		return -1;
129 	}
130 
131 	idx = iminor(inode);
132 	fput(file);
133 
134 	if(idx < 0 || idx >= MAX_CODADEVS) {
135 		printk("coda_read_super: Bad minor number\n");
136 		return -1;
137 	}
138 
139 	return idx;
140 }
141 
142 static int coda_fill_super(struct super_block *sb, void *data, int silent)
143 {
144         struct inode *root = NULL;
145 	struct coda_sb_info *sbi = NULL;
146 	struct venus_comm *vc = NULL;
147 	struct CodaFid fid;
148         int error;
149 	int idx;
150 
151 	idx = get_device_index((struct coda_mount_data *) data);
152 
153 	/* Ignore errors in data, for backward compatibility */
154 	if(idx == -1)
155 		idx = 0;
156 
157 	printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
158 
159 	vc = &coda_comms[idx];
160 	if (!vc->vc_inuse) {
161 		printk("coda_read_super: No pseudo device\n");
162 		return -EINVAL;
163 	}
164 
165         if ( vc->vc_sb ) {
166 		printk("coda_read_super: Device already mounted\n");
167 		return -EBUSY;
168 	}
169 
170 	sbi = kmalloc(sizeof(struct coda_sb_info), GFP_KERNEL);
171 	if(!sbi) {
172 		return -ENOMEM;
173 	}
174 
175 	vc->vc_sb = sb;
176 
177 	sbi->sbi_vcomm = vc;
178 
179         sb->s_fs_info = sbi;
180 	sb->s_flags |= MS_NODIRATIME; /* probably even noatime */
181         sb->s_blocksize = 1024;	/* XXXXX  what do we put here?? */
182         sb->s_blocksize_bits = 10;
183         sb->s_magic = CODA_SUPER_MAGIC;
184         sb->s_op = &coda_super_operations;
185 
186 	/* get root fid from Venus: this needs the root inode */
187 	error = venus_rootfid(sb, &fid);
188 	if ( error ) {
189 	        printk("coda_read_super: coda_get_rootfid failed with %d\n",
190 		       error);
191 		goto error;
192 	}
193 	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
194 
195 	/* make root inode */
196         error = coda_cnode_make(&root, &fid, sb);
197         if ( error || !root ) {
198 	    printk("Failure of coda_cnode_make for root: error %d\n", error);
199 	    goto error;
200 	}
201 
202 	printk("coda_read_super: rootinode is %ld dev %s\n",
203 	       root->i_ino, root->i_sb->s_id);
204 	sb->s_root = d_alloc_root(root);
205 	if (!sb->s_root)
206 		goto error;
207         return 0;
208 
209  error:
210 	if (sbi) {
211 		kfree(sbi);
212 		if(vc)
213 			vc->vc_sb = NULL;
214 	}
215 	if (root)
216                 iput(root);
217 
218         return -EINVAL;
219 }
220 
221 static void coda_put_super(struct super_block *sb)
222 {
223         struct coda_sb_info *sbi;
224 
225 	sbi = coda_sbp(sb);
226 	sbi->sbi_vcomm->vc_sb = NULL;
227 
228 	printk("Coda: Bye bye.\n");
229 	kfree(sbi);
230 }
231 
232 static void coda_clear_inode(struct inode *inode)
233 {
234 	coda_cache_clear_inode(inode);
235 }
236 
237 int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
238 {
239 	int err = coda_revalidate_inode(dentry);
240 	if (!err)
241 		generic_fillattr(dentry->d_inode, stat);
242 	return err;
243 }
244 
245 int coda_setattr(struct dentry *de, struct iattr *iattr)
246 {
247 	struct inode *inode = de->d_inode;
248 	struct coda_vattr vattr;
249 	int error;
250 
251 	lock_kernel();
252 
253 	memset(&vattr, 0, sizeof(vattr));
254 
255 	inode->i_ctime = CURRENT_TIME_SEC;
256 	coda_iattr_to_vattr(iattr, &vattr);
257 	vattr.va_type = C_VNON; /* cannot set type */
258 
259 	/* Venus is responsible for truncating the container-file!!! */
260 	error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
261 
262 	if ( !error ) {
263 	        coda_vattr_to_iattr(inode, &vattr);
264 		coda_cache_clear_inode(inode);
265 	}
266 
267 	unlock_kernel();
268 
269 	return error;
270 }
271 
272 const struct inode_operations coda_file_inode_operations = {
273 	.permission	= coda_permission,
274 	.getattr	= coda_getattr,
275 	.setattr	= coda_setattr,
276 };
277 
278 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
279 {
280 	int error;
281 
282 	lock_kernel();
283 
284 	error = venus_statfs(dentry, buf);
285 
286 	unlock_kernel();
287 
288 	if (error) {
289 		/* fake something like AFS does */
290 		buf->f_blocks = 9000000;
291 		buf->f_bfree  = 9000000;
292 		buf->f_bavail = 9000000;
293 		buf->f_files  = 9000000;
294 		buf->f_ffree  = 9000000;
295 	}
296 
297 	/* and fill in the rest */
298 	buf->f_type = CODA_SUPER_MAGIC;
299 	buf->f_bsize = 1024;
300 	buf->f_namelen = CODA_MAXNAMLEN;
301 
302 	return 0;
303 }
304 
305 /* init_coda: used by filesystems.c to register coda */
306 
307 static int coda_get_sb(struct file_system_type *fs_type,
308 	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
309 {
310 	return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt);
311 }
312 
313 struct file_system_type coda_fs_type = {
314 	.owner		= THIS_MODULE,
315 	.name		= "coda",
316 	.get_sb		= coda_get_sb,
317 	.kill_sb	= kill_anon_super,
318 	.fs_flags	= FS_BINARY_MOUNTDATA,
319 };
320 
321