netns: Teach network device kobjects which namespace they are in.
[linux-2.6/linux-acpi-2.6/ibm-acpi-2.6.git] / fs / coda / inode.c
blobd97f9935a0285ea150f885cb7609b65b4eccc41f
1 /*
2 * Super block/filesystem wide operations
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 */
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 #include <linux/slab.h>
23 #include <asm/system.h>
24 #include <asm/uaccess.h>
26 #include <linux/fs.h>
27 #include <linux/vmalloc.h>
29 #include <linux/coda.h>
30 #include <linux/coda_linux.h>
31 #include <linux/coda_psdev.h>
32 #include <linux/coda_fs_i.h>
33 #include <linux/coda_cache.h>
35 #include "coda_int.h"
37 /* VFS super_block ops */
38 static void coda_clear_inode(struct inode *);
39 static void coda_put_super(struct super_block *);
40 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);
42 static struct kmem_cache * coda_inode_cachep;
44 static struct inode *coda_alloc_inode(struct super_block *sb)
46 struct coda_inode_info *ei;
47 ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
48 if (!ei)
49 return NULL;
50 memset(&ei->c_fid, 0, sizeof(struct CodaFid));
51 ei->c_flags = 0;
52 ei->c_uid = 0;
53 ei->c_cached_perm = 0;
54 return &ei->vfs_inode;
57 static void coda_destroy_inode(struct inode *inode)
59 kmem_cache_free(coda_inode_cachep, ITOC(inode));
62 static void init_once(void *foo)
64 struct coda_inode_info *ei = (struct coda_inode_info *) foo;
66 inode_init_once(&ei->vfs_inode);
69 int coda_init_inodecache(void)
71 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
72 sizeof(struct coda_inode_info),
73 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
74 init_once);
75 if (coda_inode_cachep == NULL)
76 return -ENOMEM;
77 return 0;
80 void coda_destroy_inodecache(void)
82 kmem_cache_destroy(coda_inode_cachep);
85 static int coda_remount(struct super_block *sb, int *flags, char *data)
87 *flags |= MS_NOATIME;
88 return 0;
91 /* exported operations */
92 static const struct super_operations coda_super_operations =
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,
102 static int get_device_index(struct coda_mount_data *data)
104 struct file *file;
105 struct inode *inode;
106 int idx;
108 if(data == NULL) {
109 printk("coda_read_super: Bad mount data\n");
110 return -1;
113 if(data->version != CODA_MOUNT_VERSION) {
114 printk("coda_read_super: Bad mount version\n");
115 return -1;
118 file = fget(data->fd);
119 inode = NULL;
120 if(file)
121 inode = file->f_path.dentry->d_inode;
123 if(!inode || !S_ISCHR(inode->i_mode) ||
124 imajor(inode) != CODA_PSDEV_MAJOR) {
125 if(file)
126 fput(file);
128 printk("coda_read_super: Bad file\n");
129 return -1;
132 idx = iminor(inode);
133 fput(file);
135 if(idx < 0 || idx >= MAX_CODADEVS) {
136 printk("coda_read_super: Bad minor number\n");
137 return -1;
140 return idx;
143 static int coda_fill_super(struct super_block *sb, void *data, int silent)
145 struct inode *root = NULL;
146 struct venus_comm *vc = NULL;
147 struct CodaFid fid;
148 int error;
149 int idx;
151 idx = get_device_index((struct coda_mount_data *) data);
153 /* Ignore errors in data, for backward compatibility */
154 if(idx == -1)
155 idx = 0;
157 printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
159 vc = &coda_comms[idx];
160 if (!vc->vc_inuse) {
161 printk("coda_read_super: No pseudo device\n");
162 return -EINVAL;
165 if ( vc->vc_sb ) {
166 printk("coda_read_super: Device already mounted\n");
167 return -EBUSY;
170 error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
171 if (error)
172 goto bdi_err;
174 vc->vc_sb = sb;
176 sb->s_fs_info = vc;
177 sb->s_flags |= MS_NOATIME;
178 sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
179 sb->s_blocksize_bits = 12;
180 sb->s_magic = CODA_SUPER_MAGIC;
181 sb->s_op = &coda_super_operations;
182 sb->s_bdi = &vc->bdi;
184 /* get root fid from Venus: this needs the root inode */
185 error = venus_rootfid(sb, &fid);
186 if ( error ) {
187 printk("coda_read_super: coda_get_rootfid failed with %d\n",
188 error);
189 goto error;
191 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
193 /* make root inode */
194 error = coda_cnode_make(&root, &fid, sb);
195 if ( error || !root ) {
196 printk("Failure of coda_cnode_make for root: error %d\n", error);
197 goto error;
200 printk("coda_read_super: rootinode is %ld dev %s\n",
201 root->i_ino, root->i_sb->s_id);
202 sb->s_root = d_alloc_root(root);
203 if (!sb->s_root)
204 goto error;
205 return 0;
207 error:
208 bdi_destroy(&vc->bdi);
209 bdi_err:
210 if (root)
211 iput(root);
212 if (vc)
213 vc->vc_sb = NULL;
215 return -EINVAL;
218 static void coda_put_super(struct super_block *sb)
220 bdi_destroy(&coda_vcp(sb)->bdi);
221 coda_vcp(sb)->vc_sb = NULL;
222 sb->s_fs_info = NULL;
224 printk("Coda: Bye bye.\n");
227 static void coda_clear_inode(struct inode *inode)
229 coda_cache_clear_inode(inode);
232 int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
234 int err = coda_revalidate_inode(dentry);
235 if (!err)
236 generic_fillattr(dentry->d_inode, stat);
237 return err;
240 int coda_setattr(struct dentry *de, struct iattr *iattr)
242 struct inode *inode = de->d_inode;
243 struct coda_vattr vattr;
244 int error;
246 lock_kernel();
248 memset(&vattr, 0, sizeof(vattr));
250 inode->i_ctime = CURRENT_TIME_SEC;
251 coda_iattr_to_vattr(iattr, &vattr);
252 vattr.va_type = C_VNON; /* cannot set type */
254 /* Venus is responsible for truncating the container-file!!! */
255 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
257 if ( !error ) {
258 coda_vattr_to_iattr(inode, &vattr);
259 coda_cache_clear_inode(inode);
262 unlock_kernel();
264 return error;
267 const struct inode_operations coda_file_inode_operations = {
268 .permission = coda_permission,
269 .getattr = coda_getattr,
270 .setattr = coda_setattr,
273 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
275 int error;
277 lock_kernel();
279 error = venus_statfs(dentry, buf);
281 unlock_kernel();
283 if (error) {
284 /* fake something like AFS does */
285 buf->f_blocks = 9000000;
286 buf->f_bfree = 9000000;
287 buf->f_bavail = 9000000;
288 buf->f_files = 9000000;
289 buf->f_ffree = 9000000;
292 /* and fill in the rest */
293 buf->f_type = CODA_SUPER_MAGIC;
294 buf->f_bsize = 4096;
295 buf->f_namelen = CODA_MAXNAMLEN;
297 return 0;
300 /* init_coda: used by filesystems.c to register coda */
302 static int coda_get_sb(struct file_system_type *fs_type,
303 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
305 return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt);
308 struct file_system_type coda_fs_type = {
309 .owner = THIS_MODULE,
310 .name = "coda",
311 .get_sb = coda_get_sb,
312 .kill_sb = kill_anon_super,
313 .fs_flags = FS_BINARY_MOUNTDATA,