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 #include <linux/slab.h> 22 23 #include <asm/system.h> 24 #include <asm/uaccess.h> 25 26 #include <linux/fs.h> 27 #include <linux/vmalloc.h> 28 29 #include <linux/coda.h> 30 #include <linux/coda_linux.h> 31 #include <linux/coda_psdev.h> 32 #include <linux/coda_fs_i.h> 33 #include <linux/coda_cache.h> 34 35 #include "coda_int.h" 36 37 /* VFS super_block ops */ 38 static void coda_evict_inode(struct inode *); 39 static void coda_put_super(struct super_block *); 40 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf); 41 42 static struct kmem_cache * coda_inode_cachep; 43 44 static struct inode *coda_alloc_inode(struct super_block *sb) 45 { 46 struct coda_inode_info *ei; 47 ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL); 48 if (!ei) 49 return NULL; 50 memset(&ei->c_fid, 0, sizeof(struct CodaFid)); 51 ei->c_flags = 0; 52 ei->c_uid = 0; 53 ei->c_cached_perm = 0; 54 return &ei->vfs_inode; 55 } 56 57 static void coda_destroy_inode(struct inode *inode) 58 { 59 kmem_cache_free(coda_inode_cachep, ITOC(inode)); 60 } 61 62 static void init_once(void *foo) 63 { 64 struct coda_inode_info *ei = (struct coda_inode_info *) foo; 65 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_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 74 init_once); 75 if (coda_inode_cachep == NULL) 76 return -ENOMEM; 77 return 0; 78 } 79 80 void coda_destroy_inodecache(void) 81 { 82 kmem_cache_destroy(coda_inode_cachep); 83 } 84 85 static int coda_remount(struct super_block *sb, int *flags, char *data) 86 { 87 *flags |= MS_NOATIME; 88 return 0; 89 } 90 91 /* exported operations */ 92 static const struct super_operations coda_super_operations = 93 { 94 .alloc_inode = coda_alloc_inode, 95 .destroy_inode = coda_destroy_inode, 96 .evict_inode = coda_evict_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_path.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 venus_comm *vc = NULL; 147 struct CodaFid fid; 148 int error; 149 int idx; 150 151 lock_kernel(); 152 153 idx = get_device_index((struct coda_mount_data *) data); 154 155 /* Ignore errors in data, for backward compatibility */ 156 if(idx == -1) 157 idx = 0; 158 159 printk(KERN_INFO "coda_read_super: device index: %i\n", idx); 160 161 vc = &coda_comms[idx]; 162 if (!vc->vc_inuse) { 163 printk("coda_read_super: No pseudo device\n"); 164 unlock_kernel(); 165 return -EINVAL; 166 } 167 168 if ( vc->vc_sb ) { 169 printk("coda_read_super: Device already mounted\n"); 170 unlock_kernel(); 171 return -EBUSY; 172 } 173 174 error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY); 175 if (error) 176 goto bdi_err; 177 178 vc->vc_sb = sb; 179 180 sb->s_fs_info = vc; 181 sb->s_flags |= MS_NOATIME; 182 sb->s_blocksize = 4096; /* XXXXX what do we put here?? */ 183 sb->s_blocksize_bits = 12; 184 sb->s_magic = CODA_SUPER_MAGIC; 185 sb->s_op = &coda_super_operations; 186 sb->s_bdi = &vc->bdi; 187 188 /* get root fid from Venus: this needs the root inode */ 189 error = venus_rootfid(sb, &fid); 190 if ( error ) { 191 printk("coda_read_super: coda_get_rootfid failed with %d\n", 192 error); 193 goto error; 194 } 195 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid)); 196 197 /* 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); 201 goto error; 202 } 203 204 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); 207 if (!sb->s_root) 208 goto error; 209 unlock_kernel(); 210 return 0; 211 212 error: 213 bdi_destroy(&vc->bdi); 214 bdi_err: 215 if (root) 216 iput(root); 217 if (vc) 218 vc->vc_sb = NULL; 219 220 unlock_kernel(); 221 return -EINVAL; 222 } 223 224 static void coda_put_super(struct super_block *sb) 225 { 226 bdi_destroy(&coda_vcp(sb)->bdi); 227 coda_vcp(sb)->vc_sb = NULL; 228 sb->s_fs_info = NULL; 229 230 printk("Coda: Bye bye.\n"); 231 } 232 233 static void coda_evict_inode(struct inode *inode) 234 { 235 truncate_inode_pages(&inode->i_data, 0); 236 end_writeback(inode); 237 coda_cache_clear_inode(inode); 238 } 239 240 int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 241 { 242 int err = coda_revalidate_inode(dentry); 243 if (!err) 244 generic_fillattr(dentry->d_inode, stat); 245 return err; 246 } 247 248 int coda_setattr(struct dentry *de, struct iattr *iattr) 249 { 250 struct inode *inode = de->d_inode; 251 struct coda_vattr vattr; 252 int error; 253 254 lock_kernel(); 255 256 memset(&vattr, 0, sizeof(vattr)); 257 258 inode->i_ctime = CURRENT_TIME_SEC; 259 coda_iattr_to_vattr(iattr, &vattr); 260 vattr.va_type = C_VNON; /* cannot set type */ 261 262 /* Venus is responsible for truncating the container-file!!! */ 263 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr); 264 265 if ( !error ) { 266 coda_vattr_to_iattr(inode, &vattr); 267 coda_cache_clear_inode(inode); 268 } 269 270 unlock_kernel(); 271 272 return error; 273 } 274 275 const struct inode_operations coda_file_inode_operations = { 276 .permission = coda_permission, 277 .getattr = coda_getattr, 278 .setattr = coda_setattr, 279 }; 280 281 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf) 282 { 283 int error; 284 285 lock_kernel(); 286 287 error = venus_statfs(dentry, buf); 288 289 unlock_kernel(); 290 291 if (error) { 292 /* fake something like AFS does */ 293 buf->f_blocks = 9000000; 294 buf->f_bfree = 9000000; 295 buf->f_bavail = 9000000; 296 buf->f_files = 9000000; 297 buf->f_ffree = 9000000; 298 } 299 300 /* and fill in the rest */ 301 buf->f_type = CODA_SUPER_MAGIC; 302 buf->f_bsize = 4096; 303 buf->f_namelen = CODA_MAXNAMLEN; 304 305 return 0; 306 } 307 308 /* init_coda: used by filesystems.c to register coda */ 309 310 static int coda_get_sb(struct file_system_type *fs_type, 311 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 312 { 313 return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt); 314 } 315 316 struct file_system_type coda_fs_type = { 317 .owner = THIS_MODULE, 318 .name = "coda", 319 .get_sb = coda_get_sb, 320 .kill_sb = kill_anon_super, 321 .fs_flags = FS_BINARY_MOUNTDATA, 322 }; 323 324