xref: /openbmc/linux/fs/coda/inode.c (revision 9d56dd3b083a3bec56e9da35ce07baca81030b03)
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)
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);
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_NOATIME;
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 venus_comm *vc = NULL;
146 	struct CodaFid fid;
147 	int error;
148 	int idx;
149 
150 	idx = get_device_index((struct coda_mount_data *) data);
151 
152 	/* Ignore errors in data, for backward compatibility */
153 	if(idx == -1)
154 		idx = 0;
155 
156 	printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
157 
158 	vc = &coda_comms[idx];
159 	if (!vc->vc_inuse) {
160 		printk("coda_read_super: No pseudo device\n");
161 		return -EINVAL;
162 	}
163 
164         if ( vc->vc_sb ) {
165 		printk("coda_read_super: Device already mounted\n");
166 		return -EBUSY;
167 	}
168 
169 	vc->vc_sb = sb;
170 
171 	sb->s_fs_info = vc;
172 	sb->s_flags |= MS_NOATIME;
173 	sb->s_blocksize = 4096;	/* XXXXX  what do we put here?? */
174 	sb->s_blocksize_bits = 12;
175 	sb->s_magic = CODA_SUPER_MAGIC;
176 	sb->s_op = &coda_super_operations;
177 
178 	/* get root fid from Venus: this needs the root inode */
179 	error = venus_rootfid(sb, &fid);
180 	if ( error ) {
181 	        printk("coda_read_super: coda_get_rootfid failed with %d\n",
182 		       error);
183 		goto error;
184 	}
185 	printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
186 
187 	/* make root inode */
188         error = coda_cnode_make(&root, &fid, sb);
189         if ( error || !root ) {
190 	    printk("Failure of coda_cnode_make for root: error %d\n", error);
191 	    goto error;
192 	}
193 
194 	printk("coda_read_super: rootinode is %ld dev %s\n",
195 	       root->i_ino, root->i_sb->s_id);
196 	sb->s_root = d_alloc_root(root);
197 	if (!sb->s_root)
198 		goto error;
199         return 0;
200 
201  error:
202 	if (root)
203 		iput(root);
204 	if (vc)
205 		vc->vc_sb = NULL;
206 
207 	return -EINVAL;
208 }
209 
210 static void coda_put_super(struct super_block *sb)
211 {
212 	coda_vcp(sb)->vc_sb = NULL;
213 	sb->s_fs_info = NULL;
214 
215 	printk("Coda: Bye bye.\n");
216 }
217 
218 static void coda_clear_inode(struct inode *inode)
219 {
220 	coda_cache_clear_inode(inode);
221 }
222 
223 int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
224 {
225 	int err = coda_revalidate_inode(dentry);
226 	if (!err)
227 		generic_fillattr(dentry->d_inode, stat);
228 	return err;
229 }
230 
231 int coda_setattr(struct dentry *de, struct iattr *iattr)
232 {
233 	struct inode *inode = de->d_inode;
234 	struct coda_vattr vattr;
235 	int error;
236 
237 	lock_kernel();
238 
239 	memset(&vattr, 0, sizeof(vattr));
240 
241 	inode->i_ctime = CURRENT_TIME_SEC;
242 	coda_iattr_to_vattr(iattr, &vattr);
243 	vattr.va_type = C_VNON; /* cannot set type */
244 
245 	/* Venus is responsible for truncating the container-file!!! */
246 	error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
247 
248 	if ( !error ) {
249 	        coda_vattr_to_iattr(inode, &vattr);
250 		coda_cache_clear_inode(inode);
251 	}
252 
253 	unlock_kernel();
254 
255 	return error;
256 }
257 
258 const struct inode_operations coda_file_inode_operations = {
259 	.permission	= coda_permission,
260 	.getattr	= coda_getattr,
261 	.setattr	= coda_setattr,
262 };
263 
264 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
265 {
266 	int error;
267 
268 	lock_kernel();
269 
270 	error = venus_statfs(dentry, buf);
271 
272 	unlock_kernel();
273 
274 	if (error) {
275 		/* fake something like AFS does */
276 		buf->f_blocks = 9000000;
277 		buf->f_bfree  = 9000000;
278 		buf->f_bavail = 9000000;
279 		buf->f_files  = 9000000;
280 		buf->f_ffree  = 9000000;
281 	}
282 
283 	/* and fill in the rest */
284 	buf->f_type = CODA_SUPER_MAGIC;
285 	buf->f_bsize = 4096;
286 	buf->f_namelen = CODA_MAXNAMLEN;
287 
288 	return 0;
289 }
290 
291 /* init_coda: used by filesystems.c to register coda */
292 
293 static int coda_get_sb(struct file_system_type *fs_type,
294 	int flags, const char *dev_name, void *data, struct vfsmount *mnt)
295 {
296 	return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt);
297 }
298 
299 struct file_system_type coda_fs_type = {
300 	.owner		= THIS_MODULE,
301 	.name		= "coda",
302 	.get_sb		= coda_get_sb,
303 	.kill_sb	= kill_anon_super,
304 	.fs_flags	= FS_BINARY_MOUNTDATA,
305 };
306 
307