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 struct kmem_cache * 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, GFP_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) 62 { 63 struct coda_inode_info *ei = (struct coda_inode_info *) foo; 64 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|SLAB_MEM_SPREAD, 73 init_once); 74 if (coda_inode_cachep == NULL) 75 return -ENOMEM; 76 return 0; 77 } 78 79 void coda_destroy_inodecache(void) 80 { 81 kmem_cache_destroy(coda_inode_cachep); 82 } 83 84 static int coda_remount(struct super_block *sb, int *flags, char *data) 85 { 86 *flags |= MS_NOATIME; 87 return 0; 88 } 89 90 /* exported operations */ 91 static const struct super_operations coda_super_operations = 92 { 93 .alloc_inode = coda_alloc_inode, 94 .destroy_inode = coda_destroy_inode, 95 .clear_inode = coda_clear_inode, 96 .put_super = coda_put_super, 97 .statfs = coda_statfs, 98 .remount_fs = coda_remount, 99 }; 100 101 static int get_device_index(struct coda_mount_data *data) 102 { 103 struct file *file; 104 struct inode *inode; 105 int idx; 106 107 if(data == NULL) { 108 printk("coda_read_super: Bad mount data\n"); 109 return -1; 110 } 111 112 if(data->version != CODA_MOUNT_VERSION) { 113 printk("coda_read_super: Bad mount version\n"); 114 return -1; 115 } 116 117 file = fget(data->fd); 118 inode = NULL; 119 if(file) 120 inode = file->f_path.dentry->d_inode; 121 122 if(!inode || !S_ISCHR(inode->i_mode) || 123 imajor(inode) != CODA_PSDEV_MAJOR) { 124 if(file) 125 fput(file); 126 127 printk("coda_read_super: Bad file\n"); 128 return -1; 129 } 130 131 idx = iminor(inode); 132 fput(file); 133 134 if(idx < 0 || idx >= MAX_CODADEVS) { 135 printk("coda_read_super: Bad minor number\n"); 136 return -1; 137 } 138 139 return idx; 140 } 141 142 static int coda_fill_super(struct super_block *sb, void *data, int silent) 143 { 144 struct inode *root = NULL; 145 struct venus_comm *vc = NULL; 146 struct CodaFid fid; 147 int error; 148 int idx; 149 150 idx = get_device_index((struct coda_mount_data *) data); 151 152 /* Ignore errors in data, for backward compatibility */ 153 if(idx == -1) 154 idx = 0; 155 156 printk(KERN_INFO "coda_read_super: device index: %i\n", idx); 157 158 vc = &coda_comms[idx]; 159 if (!vc->vc_inuse) { 160 printk("coda_read_super: No pseudo device\n"); 161 return -EINVAL; 162 } 163 164 if ( vc->vc_sb ) { 165 printk("coda_read_super: Device already mounted\n"); 166 return -EBUSY; 167 } 168 169 vc->vc_sb = sb; 170 171 sb->s_fs_info = vc; 172 sb->s_flags |= MS_NOATIME; 173 sb->s_blocksize = 4096; /* XXXXX what do we put here?? */ 174 sb->s_blocksize_bits = 12; 175 sb->s_magic = CODA_SUPER_MAGIC; 176 sb->s_op = &coda_super_operations; 177 178 /* get root fid from Venus: this needs the root inode */ 179 error = venus_rootfid(sb, &fid); 180 if ( error ) { 181 printk("coda_read_super: coda_get_rootfid failed with %d\n", 182 error); 183 goto error; 184 } 185 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid)); 186 187 /* make root inode */ 188 error = coda_cnode_make(&root, &fid, sb); 189 if ( error || !root ) { 190 printk("Failure of coda_cnode_make for root: error %d\n", error); 191 goto error; 192 } 193 194 printk("coda_read_super: rootinode is %ld dev %s\n", 195 root->i_ino, root->i_sb->s_id); 196 sb->s_root = d_alloc_root(root); 197 if (!sb->s_root) 198 goto error; 199 return 0; 200 201 error: 202 if (root) 203 iput(root); 204 if (vc) 205 vc->vc_sb = NULL; 206 207 return -EINVAL; 208 } 209 210 static void coda_put_super(struct super_block *sb) 211 { 212 coda_vcp(sb)->vc_sb = NULL; 213 sb->s_fs_info = NULL; 214 215 printk("Coda: Bye bye.\n"); 216 } 217 218 static void coda_clear_inode(struct inode *inode) 219 { 220 coda_cache_clear_inode(inode); 221 } 222 223 int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 224 { 225 int err = coda_revalidate_inode(dentry); 226 if (!err) 227 generic_fillattr(dentry->d_inode, stat); 228 return err; 229 } 230 231 int coda_setattr(struct dentry *de, struct iattr *iattr) 232 { 233 struct inode *inode = de->d_inode; 234 struct coda_vattr vattr; 235 int error; 236 237 lock_kernel(); 238 239 memset(&vattr, 0, sizeof(vattr)); 240 241 inode->i_ctime = CURRENT_TIME_SEC; 242 coda_iattr_to_vattr(iattr, &vattr); 243 vattr.va_type = C_VNON; /* cannot set type */ 244 245 /* Venus is responsible for truncating the container-file!!! */ 246 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr); 247 248 if ( !error ) { 249 coda_vattr_to_iattr(inode, &vattr); 250 coda_cache_clear_inode(inode); 251 } 252 253 unlock_kernel(); 254 255 return error; 256 } 257 258 const struct inode_operations coda_file_inode_operations = { 259 .permission = coda_permission, 260 .getattr = coda_getattr, 261 .setattr = coda_setattr, 262 }; 263 264 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf) 265 { 266 int error; 267 268 lock_kernel(); 269 270 error = venus_statfs(dentry, buf); 271 272 unlock_kernel(); 273 274 if (error) { 275 /* fake something like AFS does */ 276 buf->f_blocks = 9000000; 277 buf->f_bfree = 9000000; 278 buf->f_bavail = 9000000; 279 buf->f_files = 9000000; 280 buf->f_ffree = 9000000; 281 } 282 283 /* and fill in the rest */ 284 buf->f_type = CODA_SUPER_MAGIC; 285 buf->f_bsize = 4096; 286 buf->f_namelen = CODA_MAXNAMLEN; 287 288 return 0; 289 } 290 291 /* init_coda: used by filesystems.c to register coda */ 292 293 static int coda_get_sb(struct file_system_type *fs_type, 294 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 295 { 296 return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt); 297 } 298 299 struct file_system_type coda_fs_type = { 300 .owner = THIS_MODULE, 301 .name = "coda", 302 .get_sb = coda_get_sb, 303 .kill_sb = kill_anon_super, 304 .fs_flags = FS_BINARY_MOUNTDATA, 305 }; 306 307