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/uaccess.h>
27 #include <linux/vmalloc.h>
29 #include <linux/coda.h>
30 #include <linux/coda_psdev.h>
31 #include "coda_linux.h"
32 #include "coda_cache.h"
36 /* VFS super_block ops */
37 static void coda_evict_inode(struct inode *);
38 static void coda_put_super(struct super_block *);
39 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf);
41 static struct kmem_cache * coda_inode_cachep;
43 static struct inode *coda_alloc_inode(struct super_block *sb)
45 struct coda_inode_info *ei;
46 ei = kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL);
49 memset(&ei->c_fid, 0, sizeof(struct CodaFid));
52 ei->c_cached_perm = 0;
53 spin_lock_init(&ei->c_lock);
54 return &ei->vfs_inode;
57 static void coda_i_callback(struct rcu_head *head)
59 struct inode *inode = container_of(head, struct inode, i_rcu);
60 kmem_cache_free(coda_inode_cachep, ITOC(inode));
63 static void coda_destroy_inode(struct inode *inode)
65 call_rcu(&inode->i_rcu, coda_i_callback);
68 static void init_once(void *foo)
70 struct coda_inode_info *ei = (struct coda_inode_info *) foo;
72 inode_init_once(&ei->vfs_inode);
75 int coda_init_inodecache(void)
77 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
78 sizeof(struct coda_inode_info),
79 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
81 if (coda_inode_cachep == NULL)
86 void coda_destroy_inodecache(void)
89 * Make sure all delayed rcu free inodes are flushed before we
93 kmem_cache_destroy(coda_inode_cachep);
96 static int coda_remount(struct super_block *sb, int *flags, char *data)
102 /* exported operations */
103 static const struct super_operations coda_super_operations =
105 .alloc_inode = coda_alloc_inode,
106 .destroy_inode = coda_destroy_inode,
107 .evict_inode = coda_evict_inode,
108 .put_super = coda_put_super,
109 .statfs = coda_statfs,
110 .remount_fs = coda_remount,
113 static int get_device_index(struct coda_mount_data *data)
120 printk("coda_read_super: Bad mount data\n");
124 if (data->version != CODA_MOUNT_VERSION) {
125 printk("coda_read_super: Bad mount version\n");
132 inode = f.file->f_path.dentry->d_inode;
133 if (!S_ISCHR(inode->i_mode) || imajor(inode) != CODA_PSDEV_MAJOR) {
141 if (idx < 0 || idx >= MAX_CODADEVS) {
142 printk("coda_read_super: Bad minor number\n");
148 printk("coda_read_super: Bad file\n");
152 static int coda_fill_super(struct super_block *sb, void *data, int silent)
154 struct inode *root = NULL;
155 struct venus_comm *vc;
160 idx = get_device_index((struct coda_mount_data *) data);
162 /* Ignore errors in data, for backward compatibility */
166 printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
168 vc = &coda_comms[idx];
169 mutex_lock(&vc->vc_mutex);
172 printk("coda_read_super: No pseudo device\n");
178 printk("coda_read_super: Device already mounted\n");
183 error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY);
188 mutex_unlock(&vc->vc_mutex);
191 sb->s_flags |= MS_NOATIME;
192 sb->s_blocksize = 4096; /* XXXXX what do we put here?? */
193 sb->s_blocksize_bits = 12;
194 sb->s_magic = CODA_SUPER_MAGIC;
195 sb->s_op = &coda_super_operations;
196 sb->s_d_op = &coda_dentry_operations;
197 sb->s_bdi = &vc->bdi;
199 /* get root fid from Venus: this needs the root inode */
200 error = venus_rootfid(sb, &fid);
202 printk("coda_read_super: coda_get_rootfid failed with %d\n",
206 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
208 /* make root inode */
209 root = coda_cnode_make(&fid, sb);
211 error = PTR_ERR(root);
212 printk("Failure of coda_cnode_make for root: error %d\n", error);
216 printk("coda_read_super: rootinode is %ld dev %s\n",
217 root->i_ino, root->i_sb->s_id);
218 sb->s_root = d_make_root(root);
226 mutex_lock(&vc->vc_mutex);
227 bdi_destroy(&vc->bdi);
229 sb->s_fs_info = NULL;
231 mutex_unlock(&vc->vc_mutex);
235 static void coda_put_super(struct super_block *sb)
237 struct venus_comm *vcp = coda_vcp(sb);
238 mutex_lock(&vcp->vc_mutex);
239 bdi_destroy(&vcp->bdi);
241 sb->s_fs_info = NULL;
242 mutex_unlock(&vcp->vc_mutex);
244 printk("Coda: Bye bye.\n");
247 static void coda_evict_inode(struct inode *inode)
249 truncate_inode_pages(&inode->i_data, 0);
251 coda_cache_clear_inode(inode);
254 int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
256 int err = coda_revalidate_inode(dentry);
258 generic_fillattr(dentry->d_inode, stat);
262 int coda_setattr(struct dentry *de, struct iattr *iattr)
264 struct inode *inode = de->d_inode;
265 struct coda_vattr vattr;
268 memset(&vattr, 0, sizeof(vattr));
270 inode->i_ctime = CURRENT_TIME_SEC;
271 coda_iattr_to_vattr(iattr, &vattr);
272 vattr.va_type = C_VNON; /* cannot set type */
274 /* Venus is responsible for truncating the container-file!!! */
275 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
278 coda_vattr_to_iattr(inode, &vattr);
279 coda_cache_clear_inode(inode);
284 const struct inode_operations coda_file_inode_operations = {
285 .permission = coda_permission,
286 .getattr = coda_getattr,
287 .setattr = coda_setattr,
290 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
294 error = venus_statfs(dentry, buf);
297 /* fake something like AFS does */
298 buf->f_blocks = 9000000;
299 buf->f_bfree = 9000000;
300 buf->f_bavail = 9000000;
301 buf->f_files = 9000000;
302 buf->f_ffree = 9000000;
305 /* and fill in the rest */
306 buf->f_type = CODA_SUPER_MAGIC;
308 buf->f_namelen = CODA_MAXNAMLEN;
313 /* init_coda: used by filesystems.c to register coda */
315 static struct dentry *coda_mount(struct file_system_type *fs_type,
316 int flags, const char *dev_name, void *data)
318 return mount_nodev(fs_type, flags, data, coda_fill_super);
321 struct file_system_type coda_fs_type = {
322 .owner = THIS_MODULE,
325 .kill_sb = kill_anon_super,
326 .fs_flags = FS_BINARY_MOUNTDATA,