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 if (kmem_cache_destroy(coda_inode_cachep)) 84 printk(KERN_INFO "coda_inode_cache: not all structures were freed\n"); 85 } 86 87 static int coda_remount(struct super_block *sb, int *flags, char *data) 88 { 89 *flags |= MS_NODIRATIME; 90 return 0; 91 } 92 93 /* exported operations */ 94 static struct super_operations coda_super_operations = 95 { 96 .alloc_inode = coda_alloc_inode, 97 .destroy_inode = coda_destroy_inode, 98 .clear_inode = coda_clear_inode, 99 .put_super = coda_put_super, 100 .statfs = coda_statfs, 101 .remount_fs = coda_remount, 102 }; 103 104 static int get_device_index(struct coda_mount_data *data) 105 { 106 struct file *file; 107 struct inode *inode; 108 int idx; 109 110 if(data == NULL) { 111 printk("coda_read_super: Bad mount data\n"); 112 return -1; 113 } 114 115 if(data->version != CODA_MOUNT_VERSION) { 116 printk("coda_read_super: Bad mount version\n"); 117 return -1; 118 } 119 120 file = fget(data->fd); 121 inode = NULL; 122 if(file) 123 inode = file->f_dentry->d_inode; 124 125 if(!inode || !S_ISCHR(inode->i_mode) || 126 imajor(inode) != CODA_PSDEV_MAJOR) { 127 if(file) 128 fput(file); 129 130 printk("coda_read_super: Bad file\n"); 131 return -1; 132 } 133 134 idx = iminor(inode); 135 fput(file); 136 137 if(idx < 0 || idx >= MAX_CODADEVS) { 138 printk("coda_read_super: Bad minor number\n"); 139 return -1; 140 } 141 142 return idx; 143 } 144 145 static int coda_fill_super(struct super_block *sb, void *data, int silent) 146 { 147 struct inode *root = NULL; 148 struct coda_sb_info *sbi = NULL; 149 struct venus_comm *vc = NULL; 150 struct CodaFid fid; 151 int error; 152 int idx; 153 154 idx = get_device_index((struct coda_mount_data *) data); 155 156 /* Ignore errors in data, for backward compatibility */ 157 if(idx == -1) 158 idx = 0; 159 160 printk(KERN_INFO "coda_read_super: device index: %i\n", idx); 161 162 vc = &coda_comms[idx]; 163 if (!vc->vc_inuse) { 164 printk("coda_read_super: No pseudo device\n"); 165 return -EINVAL; 166 } 167 168 if ( vc->vc_sb ) { 169 printk("coda_read_super: Device already mounted\n"); 170 return -EBUSY; 171 } 172 173 sbi = kmalloc(sizeof(struct coda_sb_info), GFP_KERNEL); 174 if(!sbi) { 175 return -ENOMEM; 176 } 177 178 vc->vc_sb = sb; 179 180 sbi->sbi_vcomm = vc; 181 182 sb->s_fs_info = sbi; 183 sb->s_flags |= MS_NODIRATIME; /* probably even noatime */ 184 sb->s_blocksize = 1024; /* XXXXX what do we put here?? */ 185 sb->s_blocksize_bits = 10; 186 sb->s_magic = CODA_SUPER_MAGIC; 187 sb->s_op = &coda_super_operations; 188 189 /* get root fid from Venus: this needs the root inode */ 190 error = venus_rootfid(sb, &fid); 191 if ( error ) { 192 printk("coda_read_super: coda_get_rootfid failed with %d\n", 193 error); 194 goto error; 195 } 196 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid)); 197 198 /* make root inode */ 199 error = coda_cnode_make(&root, &fid, sb); 200 if ( error || !root ) { 201 printk("Failure of coda_cnode_make for root: error %d\n", error); 202 goto error; 203 } 204 205 printk("coda_read_super: rootinode is %ld dev %s\n", 206 root->i_ino, root->i_sb->s_id); 207 sb->s_root = d_alloc_root(root); 208 if (!sb->s_root) 209 goto error; 210 return 0; 211 212 error: 213 if (sbi) { 214 kfree(sbi); 215 if(vc) 216 vc->vc_sb = NULL; 217 } 218 if (root) 219 iput(root); 220 221 return -EINVAL; 222 } 223 224 static void coda_put_super(struct super_block *sb) 225 { 226 struct coda_sb_info *sbi; 227 228 sbi = coda_sbp(sb); 229 sbi->sbi_vcomm->vc_sb = NULL; 230 231 printk("Coda: Bye bye.\n"); 232 kfree(sbi); 233 } 234 235 static void coda_clear_inode(struct inode *inode) 236 { 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 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 = 1024; 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