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>
7 * Rewritten for Linux 2.1. Peter Braam <braam@cs.cmu.edu>
8 * Copyright (C) Carnegie Mellon University
11 #include <linux/module.h>
12 #include <linux/kernel.h>
14 #include <linux/string.h>
15 #include <linux/stat.h>
16 #include <linux/errno.h>
17 #include <linux/unistd.h>
18 #include <linux/mutex.h>
19 #include <linux/spinlock.h>
20 #include <linux/file.h>
21 #include <linux/vfs.h>
22 #include <linux/slab.h>
24 #include <asm/system.h>
25 #include <asm/uaccess.h>
28 #include <linux/vmalloc.h>
30 #include <linux/coda.h>
31 #include <linux/coda_linux.h>
32 #include <linux/coda_psdev.h>
33 #include <linux/coda_fs_i.h>
34 #include <linux/coda_cache.h>
38 /* VFS super_block ops */
39 static void coda_evict_inode(struct inode *);
40 static void coda_put_super(struct super_block *);
41 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);
43 static struct kmem_cache * coda_inode_cachep;
45 static struct inode *coda_alloc_inode(struct super_block *sb)
47 struct coda_inode_info *ei;
48 ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
51 memset(&ei->c_fid, 0, sizeof(struct CodaFid));
54 ei->c_cached_perm = 0;
55 spin_lock_init(&ei->c_lock);
56 return &ei->vfs_inode;
59 static void coda_destroy_inode(struct inode *inode)
61 kmem_cache_free(coda_inode_cachep, ITOC(inode));
64 static void init_once(void *foo)
66 struct coda_inode_info *ei = (struct coda_inode_info *) foo;
68 inode_init_once(&ei->vfs_inode);
71 int coda_init_inodecache(void)
73 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
74 sizeof(struct coda_inode_info),
75 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
77 if (coda_inode_cachep == NULL)
82 void coda_destroy_inodecache(void)
84 kmem_cache_destroy(coda_inode_cachep);
87 static int coda_remount(struct super_block *sb, int *flags, char *data)
93 /* exported operations */
94 static const struct super_operations coda_super_operations =
96 .alloc_inode = coda_alloc_inode,
97 .destroy_inode = coda_destroy_inode,
98 .evict_inode = coda_evict_inode,
99 .put_super = coda_put_super,
100 .statfs = coda_statfs,
101 .remount_fs = coda_remount,
104 static int get_device_index(struct coda_mount_data *data)
111 printk("coda_read_super: Bad mount data\n");
115 if(data->version != CODA_MOUNT_VERSION) {
116 printk("coda_read_super: Bad mount version\n");
120 file = fget(data->fd);
123 inode = file->f_path.dentry->d_inode;
125 if(!inode || !S_ISCHR(inode->i_mode) ||
126 imajor(inode) != CODA_PSDEV_MAJOR) {
130 printk("coda_read_super: Bad file\n");
137 if(idx < 0 || idx >= MAX_CODADEVS) {
138 printk("coda_read_super: Bad minor number\n");
145 static int coda_fill_super(struct super_block *sb, void *data, int silent)
147 struct inode *root = NULL;
148 struct venus_comm *vc;
153 idx = get_device_index((struct coda_mount_data *) data);
155 /* Ignore errors in data, for backward compatibility */
159 printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
161 vc = &coda_comms[idx];
162 mutex_lock(&vc->vc_mutex);
165 printk("coda_read_super: No pseudo device\n");
171 printk("coda_read_super: Device already mounted\n");
176 error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
181 mutex_unlock(&vc->vc_mutex);
184 sb->s_flags |= MS_NOATIME;
185 sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
186 sb->s_blocksize_bits = 12;
187 sb->s_magic = CODA_SUPER_MAGIC;
188 sb->s_op = &coda_super_operations;
189 sb->s_bdi = &vc->bdi;
191 /* get root fid from Venus: this needs the root inode */
192 error = venus_rootfid(sb, &fid);
194 printk("coda_read_super: coda_get_rootfid failed with %d\n",
198 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
200 /* make root inode */
201 error = coda_cnode_make(&root, &fid, sb);
202 if ( error || !root ) {
203 printk("Failure of coda_cnode_make for root: error %d\n", error);
207 printk("coda_read_super: rootinode is %ld dev %s\n",
208 root->i_ino, root->i_sb->s_id);
209 sb->s_root = d_alloc_root(root);
220 mutex_lock(&vc->vc_mutex);
221 bdi_destroy(&vc->bdi);
223 sb->s_fs_info = NULL;
225 mutex_unlock(&vc->vc_mutex);
229 static void coda_put_super(struct super_block *sb)
231 struct venus_comm *vcp = coda_vcp(sb);
232 mutex_lock(&vcp->vc_mutex);
233 bdi_destroy(&vcp->bdi);
235 sb->s_fs_info = NULL;
236 mutex_unlock(&vcp->vc_mutex);
238 printk("Coda: Bye bye.\n");
241 static void coda_evict_inode(struct inode *inode)
243 truncate_inode_pages(&inode->i_data, 0);
244 end_writeback(inode);
245 coda_cache_clear_inode(inode);
248 int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
250 int err = coda_revalidate_inode(dentry);
252 generic_fillattr(dentry->d_inode, stat);
256 int coda_setattr(struct dentry *de, struct iattr *iattr)
258 struct inode *inode = de->d_inode;
259 struct coda_vattr vattr;
262 memset(&vattr, 0, sizeof(vattr));
264 inode->i_ctime = CURRENT_TIME_SEC;
265 coda_iattr_to_vattr(iattr, &vattr);
266 vattr.va_type = C_VNON; /* cannot set type */
268 /* Venus is responsible for truncating the container-file!!! */
269 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
272 coda_vattr_to_iattr(inode, &vattr);
273 coda_cache_clear_inode(inode);
278 const struct inode_operations coda_file_inode_operations = {
279 .permission = coda_permission,
280 .getattr = coda_getattr,
281 .setattr = coda_setattr,
284 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
288 error = venus_statfs(dentry, buf);
291 /* fake something like AFS does */
292 buf->f_blocks = 9000000;
293 buf->f_bfree = 9000000;
294 buf->f_bavail = 9000000;
295 buf->f_files = 9000000;
296 buf->f_ffree = 9000000;
299 /* and fill in the rest */
300 buf->f_type = CODA_SUPER_MAGIC;
302 buf->f_namelen = CODA_MAXNAMLEN;
307 /* init_coda: used by filesystems.c to register coda */
309 static struct dentry *coda_mount(struct file_system_type *fs_type,
310 int flags, const char *dev_name, void *data)
312 return mount_nodev(fs_type, flags, data, coda_fill_super);
315 struct file_system_type coda_fs_type = {
316 .owner = THIS_MODULE,
319 .kill_sb = kill_anon_super,
320 .fs_flags = FS_BINARY_MOUNTDATA,