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 kstatfs *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 CodaFid)); 48 ei->c_flags = 0; 49 ei->c_uid = 0; 50 ei->c_cached_perm = 0; 51 return &ei->vfs_inode; 52 } 53 54 static void coda_destroy_inode(struct inode *inode) 55 { 56 kmem_cache_free(coda_inode_cachep, ITOC(inode)); 57 } 58 59 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) 60 { 61 struct coda_inode_info *ei = (struct coda_inode_info *) foo; 62 63 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 64 SLAB_CTOR_CONSTRUCTOR) 65 inode_init_once(&ei->vfs_inode); 66 } 67 68 int coda_init_inodecache(void) 69 { 70 coda_inode_cachep = kmem_cache_create("coda_inode_cache", 71 sizeof(struct coda_inode_info), 72 0, SLAB_RECLAIM_ACCOUNT, 73 init_once, NULL); 74 if (coda_inode_cachep == NULL) 75 return -ENOMEM; 76 return 0; 77 } 78 79 void coda_destroy_inodecache(void) 80 { 81 if (kmem_cache_destroy(coda_inode_cachep)) 82 printk(KERN_INFO "coda_inode_cache: not all structures were freed\n"); 83 } 84 85 static int coda_remount(struct super_block *sb, int *flags, char *data) 86 { 87 *flags |= MS_NODIRATIME; 88 return 0; 89 } 90 91 /* exported operations */ 92 static struct super_operations coda_super_operations = 93 { 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, 100 }; 101 102 static int get_device_index(struct coda_mount_data *data) 103 { 104 struct file *file; 105 struct inode *inode; 106 int idx; 107 108 if(data == NULL) { 109 printk("coda_read_super: Bad mount data\n"); 110 return -1; 111 } 112 113 if(data->version != CODA_MOUNT_VERSION) { 114 printk("coda_read_super: Bad mount version\n"); 115 return -1; 116 } 117 118 file = fget(data->fd); 119 inode = NULL; 120 if(file) 121 inode = file->f_dentry->d_inode; 122 123 if(!inode || !S_ISCHR(inode->i_mode) || 124 imajor(inode) != CODA_PSDEV_MAJOR) { 125 if(file) 126 fput(file); 127 128 printk("coda_read_super: Bad file\n"); 129 return -1; 130 } 131 132 idx = iminor(inode); 133 fput(file); 134 135 if(idx < 0 || idx >= MAX_CODADEVS) { 136 printk("coda_read_super: Bad minor number\n"); 137 return -1; 138 } 139 140 return idx; 141 } 142 143 static int coda_fill_super(struct super_block *sb, void *data, int silent) 144 { 145 struct inode *root = NULL; 146 struct coda_sb_info *sbi = NULL; 147 struct venus_comm *vc = NULL; 148 struct CodaFid fid; 149 int error; 150 int idx; 151 152 idx = get_device_index((struct coda_mount_data *) data); 153 154 /* Ignore errors in data, for backward compatibility */ 155 if(idx == -1) 156 idx = 0; 157 158 printk(KERN_INFO "coda_read_super: device index: %i\n", idx); 159 160 vc = &coda_comms[idx]; 161 if (!vc->vc_inuse) { 162 printk("coda_read_super: No pseudo device\n"); 163 return -EINVAL; 164 } 165 166 if ( vc->vc_sb ) { 167 printk("coda_read_super: Device already mounted\n"); 168 return -EBUSY; 169 } 170 171 sbi = kmalloc(sizeof(struct coda_sb_info), GFP_KERNEL); 172 if(!sbi) { 173 return -ENOMEM; 174 } 175 176 vc->vc_sb = sb; 177 178 sbi->sbi_vcomm = vc; 179 180 sb->s_fs_info = sbi; 181 sb->s_flags |= MS_NODIRATIME; /* probably even noatime */ 182 sb->s_blocksize = 1024; /* XXXXX what do we put here?? */ 183 sb->s_blocksize_bits = 10; 184 sb->s_magic = CODA_SUPER_MAGIC; 185 sb->s_op = &coda_super_operations; 186 187 /* get root fid from Venus: this needs the root inode */ 188 error = venus_rootfid(sb, &fid); 189 if ( error ) { 190 printk("coda_read_super: coda_get_rootfid failed with %d\n", 191 error); 192 goto error; 193 } 194 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid)); 195 196 /* make root inode */ 197 error = coda_cnode_make(&root, &fid, sb); 198 if ( error || !root ) { 199 printk("Failure of coda_cnode_make for root: error %d\n", error); 200 goto error; 201 } 202 203 printk("coda_read_super: rootinode is %ld dev %s\n", 204 root->i_ino, root->i_sb->s_id); 205 sb->s_root = d_alloc_root(root); 206 if (!sb->s_root) 207 goto error; 208 return 0; 209 210 error: 211 if (sbi) { 212 kfree(sbi); 213 if(vc) 214 vc->vc_sb = NULL; 215 } 216 if (root) 217 iput(root); 218 219 return -EINVAL; 220 } 221 222 static void coda_put_super(struct super_block *sb) 223 { 224 struct coda_sb_info *sbi; 225 226 sbi = coda_sbp(sb); 227 sbi->sbi_vcomm->vc_sb = NULL; 228 229 printk("Coda: Bye bye.\n"); 230 kfree(sbi); 231 } 232 233 static void coda_clear_inode(struct inode *inode) 234 { 235 coda_cache_clear_inode(inode); 236 } 237 238 int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 239 { 240 int err = coda_revalidate_inode(dentry); 241 if (!err) 242 generic_fillattr(dentry->d_inode, stat); 243 return err; 244 } 245 246 int coda_setattr(struct dentry *de, struct iattr *iattr) 247 { 248 struct inode *inode = de->d_inode; 249 struct coda_vattr vattr; 250 int error; 251 252 lock_kernel(); 253 254 memset(&vattr, 0, sizeof(vattr)); 255 256 inode->i_ctime = CURRENT_TIME_SEC; 257 coda_iattr_to_vattr(iattr, &vattr); 258 vattr.va_type = C_VNON; /* cannot set type */ 259 260 /* Venus is responsible for truncating the container-file!!! */ 261 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr); 262 263 if ( !error ) { 264 coda_vattr_to_iattr(inode, &vattr); 265 coda_cache_clear_inode(inode); 266 } 267 268 unlock_kernel(); 269 270 return error; 271 } 272 273 struct inode_operations coda_file_inode_operations = { 274 .permission = coda_permission, 275 .getattr = coda_getattr, 276 .setattr = coda_setattr, 277 }; 278 279 static int coda_statfs(struct super_block *sb, struct kstatfs *buf) 280 { 281 int error; 282 283 lock_kernel(); 284 285 error = venus_statfs(sb, buf); 286 287 unlock_kernel(); 288 289 if (error) { 290 /* fake something like AFS does */ 291 buf->f_blocks = 9000000; 292 buf->f_bfree = 9000000; 293 buf->f_bavail = 9000000; 294 buf->f_files = 9000000; 295 buf->f_ffree = 9000000; 296 } 297 298 /* and fill in the rest */ 299 buf->f_type = CODA_SUPER_MAGIC; 300 buf->f_bsize = 1024; 301 buf->f_namelen = CODA_MAXNAMLEN; 302 303 return 0; 304 } 305 306 /* init_coda: used by filesystems.c to register coda */ 307 308 static struct super_block *coda_get_sb(struct file_system_type *fs_type, 309 int flags, const char *dev_name, void *data) 310 { 311 return get_sb_nodev(fs_type, flags, data, coda_fill_super); 312 } 313 314 struct file_system_type coda_fs_type = { 315 .owner = THIS_MODULE, 316 .name = "coda", 317 .get_sb = coda_get_sb, 318 .kill_sb = kill_anon_super, 319 .fs_flags = FS_BINARY_MOUNTDATA, 320 }; 321 322