fs/coda/inode.c

   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 /* VFS super_block ops */
  35 static void coda_clear_inode(struct inode *);
  36 static void coda_put_super(struct super_block *);
  37 static int coda_statfs(struct super_block *sb, struct statfs *buf);
  38
  39 static kmem_cache_t * coda_inode_cachep;
  40
  41 static struct inode *coda_alloc_inode(struct super_block *sb)
  42 {
  43         struct coda_inode_info *ei;
  44         ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, SLAB_KERNEL);
  45         if (!ei)
  46                 return NULL;
  47         memset(&ei->c_fid, 0, sizeof(struct ViceFid));
  48         ei->c_flags = 0;
  49         INIT_LIST_HEAD(&ei->c_cilist);
  50         memset(&ei->c_cached_cred, 0, sizeof(struct coda_cred));
  51         ei->c_cached_perm = 0;
  52         return &ei->vfs_inode;
  53 }
  54
  55 static void coda_destroy_inode(struct inode *inode)
  56 {
  57         kmem_cache_free(coda_inode_cachep, ITOC(inode));
  58 }
  59
  60 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags)
  61 {
  62         struct coda_inode_info *ei = (struct coda_inode_info *) foo;
  63
  64         if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) ==
  65             SLAB_CTOR_CONSTRUCTOR)
  66                 inode_init_once(&ei->vfs_inode);
  67 }
  68
  69 int coda_init_inodecache(void)
  70 {
  71         coda_inode_cachep = kmem_cache_create("coda_inode_cache",
  72                                              sizeof(struct coda_inode_info),
  73                                              0, SLAB_HWCACHE_ALIGN||SLAB_RECLAIM_ACCOUNT,
  74                                              init_once, NULL);
  75         if (coda_inode_cachep == NULL)
  76                 return -ENOMEM;
  77         return 0;
  78 }
  79
  80 void coda_destroy_inodecache(void)
  81 {
  82         if (kmem_cache_destroy(coda_inode_cachep))
  83                 printk(KERN_INFO "coda_inode_cache: not all structures were freed\n");
  84 }
  85
  86 /* exported operations */
  87 struct super_operations coda_super_operations =
  88 {
  89         .alloc_inode    = coda_alloc_inode,
  90         .destroy_inode  = coda_destroy_inode,
  91         .clear_inode    = coda_clear_inode,
  92         .put_super      = coda_put_super,
  93         .statfs         = coda_statfs,
  94 };
  95
  96 static int get_device_index(struct coda_mount_data *data)
  97 {
  98         struct file *file;
  99         struct inode *inode;
 100         int idx;
 101
 102         if(data == NULL) {
 103                 printk("coda_read_super: Bad mount data\n");
 104                 return -1;
 105         }
 106
 107         if(data->version != CODA_MOUNT_VERSION) {
 108                 printk("coda_read_super: Bad mount version\n");
 109                 return -1;
 110         }
 111
 112         file = fget(data->fd);
 113         inode = NULL;
 114         if(file)
 115                 inode = file->f_dentry->d_inode;
 116
 117         if(!inode || !S_ISCHR(inode->i_mode) ||
 118            major(inode->i_rdev) != CODA_PSDEV_MAJOR) {
 119                 if(file)
 120                         fput(file);
 121
 122                 printk("coda_read_super: Bad file\n");
 123                 return -1;
 124         }
 125
 126         idx = minor(inode->i_rdev);
 127         fput(file);
 128
 129         if(idx < 0 || idx >= MAX_CODADEVS) {
 130                 printk("coda_read_super: Bad minor number\n");
 131                 return -1;
 132         }
 133
 134         return idx;
 135 }
 136
 137 static int coda_fill_super(struct super_block *sb, void *data, int silent)
 138 {
 139         struct inode *root = 0;
 140         struct coda_sb_info *sbi = NULL;
 141         struct venus_comm *vc = NULL;
 142         ViceFid fid;
 143         int error;
 144         int idx;
 145
 146         idx = get_device_index((struct coda_mount_data *) data);
 147
 148         /* Ignore errors in data, for backward compatibility */
 149         if(idx == -1)
 150                 idx = 0;
 151
 152         printk(KERN_INFO "coda_read_super: device index: %i\n", idx);
 153
 154         vc = &coda_comms[idx];
 155         if (!vc->vc_inuse) {
 156                 printk("coda_read_super: No pseudo device\n");
 157                 return -EINVAL;
 158         }
 159
 160         if ( vc->vc_sb ) {
 161                 printk("coda_read_super: Device already mounted\n");
 162                 return -EBUSY;
 163         }
 164
 165         sbi = kmalloc(sizeof(struct coda_sb_info), GFP_KERNEL);
 166         if(!sbi) {
 167                 return -ENOMEM;
 168         }
 169
 170         vc->vc_sb = sb;
 171
 172         sbi->sbi_sb = sb;
 173         sbi->sbi_vcomm = vc;
 174         INIT_LIST_HEAD(&sbi->sbi_cihead);
 175
 176         sb->s_fs_info = sbi;
 177         sb->s_blocksize = 1024; /* XXXXX  what do we put here?? */
 178         sb->s_blocksize_bits = 10;
 179         sb->s_magic = CODA_SUPER_MAGIC;
 180         sb->s_op = &coda_super_operations;
 181
 182         /* get root fid from Venus: this needs the root inode */
 183         error = venus_rootfid(sb, &fid);
 184         if ( error ) {
 185                 printk("coda_read_super: coda_get_rootfid failed with %d\n",
 186                        error);
 187                 goto error;
 188         }
 189         printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid));
 190
 191         /* make root inode */
 192         error = coda_cnode_make(&root, &fid, sb);
 193         if ( error || !root ) {
 194             printk("Failure of coda_cnode_make for root: error %d\n", error);
 195             goto error;
 196         }
 197
 198         printk("coda_read_super: rootinode is %ld dev %s\n",
 199                root->i_ino, root->i_sb->s_id);
 200         sb->s_root = d_alloc_root(root);
 201         return 0;
 202
 203  error:
 204         if (sbi) {
 205                 kfree(sbi);
 206                 if(vc)
 207                         vc->vc_sb = NULL;
 208         }
 209         if (root)
 210                 iput(root);
 211
 212         return -EINVAL;
 213 }
 214
 215 static void coda_put_super(struct super_block *sb)
 216 {
 217         struct coda_sb_info *sbi;
 218
 219         sbi = coda_sbp(sb);
 220         sbi->sbi_vcomm->vc_sb = NULL;
 221         list_del_init(&sbi->sbi_cihead);
 222
 223         printk("Coda: Bye bye.\n");
 224         kfree(sbi);
 225 }
 226
 227 static void coda_clear_inode(struct inode *inode)
 228 {
 229         struct coda_inode_info *cii = ITOC(inode);
 230
 231         list_del_init(&cii->c_cilist);
 232         coda_cache_clear_inode(inode);
 233 }
 234
 235 int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 236 {
 237         int err = coda_revalidate_inode(dentry);
 238         if (!err)
 239                 generic_fillattr(dentry->d_inode, stat);
 240         return err;
 241 }
 242
 243 int coda_setattr(struct dentry *de, struct iattr *iattr)
 244 {
 245         struct inode *inode = de->d_inode;
 246         struct coda_vattr vattr;
 247         int error;
 248
 249         lock_kernel();
 250
 251         memset(&vattr, 0, sizeof(vattr));
 252
 253         inode->i_ctime = CURRENT_TIME;
 254         coda_iattr_to_vattr(iattr, &vattr);
 255         vattr.va_type = C_VNON; /* cannot set type */
 256
 257         /* Venus is responsible for truncating the container-file!!! */
 258         error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr);
 259
 260         if ( !error ) {
 261                 coda_vattr_to_iattr(inode, &vattr);
 262                 coda_cache_clear_inode(inode);
 263         }
 264
 265         unlock_kernel();
 266
 267         return error;
 268 }
 269
 270 struct inode_operations coda_file_inode_operations = {
 271         .permission     = coda_permission,
 272         .getattr        = coda_getattr,
 273         .setattr        = coda_setattr,
 274 };
 275
 276 static int coda_statfs(struct super_block *sb, struct statfs *buf)
 277 {
 278         int error;
 279
 280         lock_kernel();
 281
 282         error = venus_statfs(sb, buf);
 283
 284         unlock_kernel();
 285
 286         if (error) {
 287                 /* fake something like AFS does */
 288                 buf->f_blocks = 9000000;
 289                 buf->f_bfree  = 9000000;
 290                 buf->f_bavail = 9000000;
 291                 buf->f_files  = 9000000;
 292                 buf->f_ffree  = 9000000;
 293         }
 294
 295         /* and fill in the rest */
 296         buf->f_type = CODA_SUPER_MAGIC;
 297         buf->f_bsize = 1024;
 298         buf->f_namelen = CODA_MAXNAMLEN;
 299
 300         return 0;
 301 }
 302
 303 /* init_coda: used by filesystems.c to register coda */
 304
 305 static struct super_block *coda_get_sb(struct file_system_type *fs_type,
 306         int flags, const char *dev_name, void *data)
 307 {
 308         return get_sb_nodev(fs_type, flags, data, coda_fill_super);
 309 }
 310
 311 struct file_system_type coda_fs_type = {
 312         .owner          = THIS_MODULE,
 313         .name           = "coda",
 314         .get_sb         = coda_get_sb,
 315         .kill_sb        = kill_anon_super,
 316 };
 317