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 #include "coda_int.h" 35 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); 40 41 static kmem_cache_t * coda_inode_cachep; 42 43 static struct inode *coda_alloc_inode(struct super_block *sb) 44 { 45 struct coda_inode_info *ei; 46 ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, SLAB_KERNEL); 47 if (!ei) 48 return NULL; 49 memset(&ei->c_fid, 0, sizeof(struct CodaFid)); 50 ei->c_flags = 0; 51 ei->c_uid = 0; 52 ei->c_cached_perm = 0; 53 return &ei->vfs_inode; 54 } 55 56 static void coda_destroy_inode(struct inode *inode) 57 { 58 kmem_cache_free(coda_inode_cachep, ITOC(inode)); 59 } 60 61 static void init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) 62 { 63 struct coda_inode_info *ei = (struct coda_inode_info *) foo; 64 65 if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == 66 SLAB_CTOR_CONSTRUCTOR) 67 inode_init_once(&ei->vfs_inode); 68 } 69 70 int coda_init_inodecache(void) 71 { 72 coda_inode_cachep = kmem_cache_create("coda_inode_cache", 73 sizeof(struct coda_inode_info), 74 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 75 init_once, NULL); 76 if (coda_inode_cachep == NULL) 77 return -ENOMEM; 78 return 0; 79 } 80 81 void coda_destroy_inodecache(void) 82 { 83 kmem_cache_destroy(coda_inode_cachep); 84 } 85 86 static int coda_remount(struct super_block *sb, int *flags, char *data) 87 { 88 *flags |= MS_NODIRATIME; 89 return 0; 90 } 91 92 /* exported operations */ 93 static struct super_operations coda_super_operations = 94 { 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, 101 }; 102 103 static int get_device_index(struct coda_mount_data *data) 104 { 105 struct file *file; 106 struct inode *inode; 107 int idx; 108 109 if(data == NULL) { 110 printk("coda_read_super: Bad mount data\n"); 111 return -1; 112 } 113 114 if(data->version != CODA_MOUNT_VERSION) { 115 printk("coda_read_super: Bad mount version\n"); 116 return -1; 117 } 118 119 file = fget(data->fd); 120 inode = NULL; 121 if(file) 122 inode = file->f_dentry->d_inode; 123 124 if(!inode || !S_ISCHR(inode->i_mode) || 125 imajor(inode) != CODA_PSDEV_MAJOR) { 126 if(file) 127 fput(file); 128 129 printk("coda_read_super: Bad file\n"); 130 return -1; 131 } 132 133 idx = iminor(inode); 134 fput(file); 135 136 if(idx < 0 || idx >= MAX_CODADEVS) { 137 printk("coda_read_super: Bad minor number\n"); 138 return -1; 139 } 140 141 return idx; 142 } 143 144 static int coda_fill_super(struct super_block *sb, void *data, int silent) 145 { 146 struct inode *root = NULL; 147 struct coda_sb_info *sbi = NULL; 148 struct venus_comm *vc = NULL; 149 struct CodaFid fid; 150 int error; 151 int idx; 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 return -EINVAL; 165 } 166 167 if ( vc->vc_sb ) { 168 printk("coda_read_super: Device already mounted\n"); 169 return -EBUSY; 170 } 171 172 sbi = kmalloc(sizeof(struct coda_sb_info), GFP_KERNEL); 173 if(!sbi) { 174 return -ENOMEM; 175 } 176 177 vc->vc_sb = sb; 178 179 sbi->sbi_vcomm = vc; 180 181 sb->s_fs_info = sbi; 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; 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 return 0; 210 211 error: 212 if (sbi) { 213 kfree(sbi); 214 if(vc) 215 vc->vc_sb = NULL; 216 } 217 if (root) 218 iput(root); 219 220 return -EINVAL; 221 } 222 223 static void coda_put_super(struct super_block *sb) 224 { 225 struct coda_sb_info *sbi; 226 227 sbi = coda_sbp(sb); 228 sbi->sbi_vcomm->vc_sb = NULL; 229 230 printk("Coda: Bye bye.\n"); 231 kfree(sbi); 232 } 233 234 static void coda_clear_inode(struct inode *inode) 235 { 236 coda_cache_clear_inode(inode); 237 } 238 239 int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 240 { 241 int err = coda_revalidate_inode(dentry); 242 if (!err) 243 generic_fillattr(dentry->d_inode, stat); 244 return err; 245 } 246 247 int coda_setattr(struct dentry *de, struct iattr *iattr) 248 { 249 struct inode *inode = de->d_inode; 250 struct coda_vattr vattr; 251 int error; 252 253 lock_kernel(); 254 255 memset(&vattr, 0, sizeof(vattr)); 256 257 inode->i_ctime = CURRENT_TIME_SEC; 258 coda_iattr_to_vattr(iattr, &vattr); 259 vattr.va_type = C_VNON; /* cannot set type */ 260 261 /* Venus is responsible for truncating the container-file!!! */ 262 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr); 263 264 if ( !error ) { 265 coda_vattr_to_iattr(inode, &vattr); 266 coda_cache_clear_inode(inode); 267 } 268 269 unlock_kernel(); 270 271 return error; 272 } 273 274 struct inode_operations coda_file_inode_operations = { 275 .permission = coda_permission, 276 .getattr = coda_getattr, 277 .setattr = coda_setattr, 278 }; 279 280 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf) 281 { 282 int error; 283 284 lock_kernel(); 285 286 error = venus_statfs(dentry, buf); 287 288 unlock_kernel(); 289 290 if (error) { 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; 297 } 298 299 /* and fill in the rest */ 300 buf->f_type = CODA_SUPER_MAGIC; 301 buf->f_bsize = 1024; 302 buf->f_namelen = CODA_MAXNAMLEN; 303 304 return 0; 305 } 306 307 /* init_coda: used by filesystems.c to register coda */ 308 309 static int coda_get_sb(struct file_system_type *fs_type, 310 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 311 { 312 return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt); 313 } 314 315 struct file_system_type coda_fs_type = { 316 .owner = THIS_MODULE, 317 .name = "coda", 318 .get_sb = coda_get_sb, 319 .kill_sb = kill_anon_super, 320 .fs_flags = FS_BINARY_MOUNTDATA, 321 }; 322 323