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/smp_lock.h>
19 #include <linux/file.h>
20 #include <linux/vfs.h>
22 #include <asm/system.h>
23 #include <asm/uaccess.h>
26 #include <linux/vmalloc.h>
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>
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);
41 static kmem_cache_t * coda_inode_cachep;
43 static struct inode *coda_alloc_inode(struct super_block *sb)
45 struct coda_inode_info *ei;
46 ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, SLAB_KERNEL);
49 memset(&ei->c_fid, 0, sizeof(struct CodaFid));
52 ei->c_cached_perm = 0;
53 return &ei->vfs_inode;
56 static void coda_destroy_inode(struct inode *inode)
58 kmem_cache_free(coda_inode_cachep, ITOC(inode));
61 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
63 struct coda_inode_info *ei = (struct coda_inode_info *) foo;
65 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
66 SLAB_CTOR_CONSTRUCTOR)
67 inode_init_once(&ei->vfs_inode);
70 int coda_init_inodecache(void)
72 coda_inode_cachep = kmem_cache_create("coda_inode_cache",
73 sizeof(struct coda_inode_info),
74 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD,
76 if (coda_inode_cachep == NULL)
81 void coda_destroy_inodecache(void)
83 kmem_cache_destroy(coda_inode_cachep);
86 static int coda_remount(struct super_block *sb, int *flags, char *data)
88 *flags |= MS_NODIRATIME;
92 /* exported operations */
93 static struct super_operations coda_super_operations =
95 .alloc_inode = coda_alloc_inode,
96 .destroy_inode = coda_destroy_inode,
97 .clear_inode = coda_clear_inode,
98 .put_super = coda_put_super,
99 .statfs = coda_statfs,
100 .remount_fs = coda_remount,
103 static int get_device_index(struct coda_mount_data *data)
110 printk("coda_read_super: Bad mount data\n");
114 if(data->version != CODA_MOUNT_VERSION) {
115 printk("coda_read_super: Bad mount version\n");
119 file = fget(data->fd);
122 inode = file->f_dentry->d_inode;
124 if(!inode || !S_ISCHR(inode->i_mode) ||
125 imajor(inode) != CODA_PSDEV_MAJOR) {
129 printk("coda_read_super: Bad file\n");
136 if(idx < 0 || idx >= MAX_CODADEVS) {
137 printk("coda_read_super: Bad minor number\n");
144 static int coda_fill_super(struct super_block *sb, void *data, int silent)
146 struct inode *root = NULL;
147 struct coda_sb_info *sbi = NULL;
148 struct venus_comm *vc = NULL;
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];
163 printk("coda_read_super: No pseudo device\n");
168 printk("coda_read_super: Device already mounted\n");
172 sbi = kmalloc(sizeof(struct coda_sb_info), GFP_KERNEL);
182 sb->s_flags |= MS_NODIRATIME; /* probably even noatime */
183 sb->s_blocksize = 1024; /* XXXXX what do we put here?? */
184 sb->s_blocksize_bits = 10;
185 sb->s_magic = CODA_SUPER_MAGIC;
186 sb->s_op = &coda_super_operations;
188 /* get root fid from Venus: this needs the root inode */
189 error = venus_rootfid(sb, &fid);
191 printk("coda_read_super: coda_get_rootfid failed with %d\n",
195 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
197 /* make root inode */
198 error = coda_cnode_make(&root, &fid, sb);
199 if ( error || !root ) {
200 printk("Failure of coda_cnode_make for root: error %d\n", error);
204 printk("coda_read_super: rootinode is %ld dev %s\n",
205 root->i_ino, root->i_sb->s_id);
206 sb->s_root = d_alloc_root(root);
223 static void coda_put_super(struct super_block *sb)
225 struct coda_sb_info *sbi;
228 sbi->sbi_vcomm->vc_sb = NULL;
230 printk("Coda: Bye bye.\n");
234 static void coda_clear_inode(struct inode *inode)
236 coda_cache_clear_inode(inode);
239 int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
241 int err = coda_revalidate_inode(dentry);
243 generic_fillattr(dentry->d_inode, stat);
247 int coda_setattr(struct dentry *de, struct iattr *iattr)
249 struct inode *inode = de->d_inode;
250 struct coda_vattr vattr;
255 memset(&vattr, 0, sizeof(vattr));
257 inode->i_ctime = CURRENT_TIME_SEC;
258 coda_iattr_to_vattr(iattr, &vattr);
259 vattr.va_type = C_VNON; /* cannot set type */
261 /* Venus is responsible for truncating the container-file!!! */
262 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
265 coda_vattr_to_iattr(inode, &vattr);
266 coda_cache_clear_inode(inode);
274 struct inode_operations coda_file_inode_operations = {
275 .permission = coda_permission,
276 .getattr = coda_getattr,
277 .setattr = coda_setattr,
280 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf)
286 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 int coda_get_sb(struct file_system_type *fs_type,
310 int flags, const char *dev_name, void *data, struct vfsmount *mnt)
312 return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt);
315 struct file_system_type coda_fs_type = {
316 .owner = THIS_MODULE,
318 .get_sb = coda_get_sb,
319 .kill_sb = kill_anon_super,
320 .fs_flags = FS_BINARY_MOUNTDATA,