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/mutex.h> 19 #include <linux/spinlock.h> 20 #include <linux/file.h> 21 #include <linux/vfs.h> 22 #include <linux/slab.h> 23 24 #include <asm/system.h> 25 #include <asm/uaccess.h> 26 27 #include <linux/fs.h> 28 #include <linux/vmalloc.h> 29 30 #include <linux/coda.h> 31 #include <linux/coda_linux.h> 32 #include <linux/coda_psdev.h> 33 #include <linux/coda_fs_i.h> 34 #include <linux/coda_cache.h> 35 36 #include "coda_int.h" 37 38 /* VFS super_block ops */ 39 static void coda_evict_inode(struct inode *); 40 static void coda_put_super(struct super_block *); 41 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf); 42 43 static struct kmem_cache * coda_inode_cachep; 44 45 static struct inode *coda_alloc_inode(struct super_block *sb) 46 { 47 struct coda_inode_info *ei; 48 ei = (struct coda_inode_info *)kmem_cache_alloc(coda_inode_cachep, GFP_KERNEL); 49 if (!ei) 50 return NULL; 51 memset(&ei->c_fid, 0, sizeof(struct CodaFid)); 52 ei->c_flags = 0; 53 ei->c_uid = 0; 54 ei->c_cached_perm = 0; 55 spin_lock_init(&ei->c_lock); 56 return &ei->vfs_inode; 57 } 58 59 static void coda_destroy_inode(struct inode *inode) 60 { 61 kmem_cache_free(coda_inode_cachep, ITOC(inode)); 62 } 63 64 static void init_once(void *foo) 65 { 66 struct coda_inode_info *ei = (struct coda_inode_info *) foo; 67 68 inode_init_once(&ei->vfs_inode); 69 } 70 71 int coda_init_inodecache(void) 72 { 73 coda_inode_cachep = kmem_cache_create("coda_inode_cache", 74 sizeof(struct coda_inode_info), 75 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, 76 init_once); 77 if (coda_inode_cachep == NULL) 78 return -ENOMEM; 79 return 0; 80 } 81 82 void coda_destroy_inodecache(void) 83 { 84 kmem_cache_destroy(coda_inode_cachep); 85 } 86 87 static int coda_remount(struct super_block *sb, int *flags, char *data) 88 { 89 *flags |= MS_NOATIME; 90 return 0; 91 } 92 93 /* exported operations */ 94 static const struct super_operations coda_super_operations = 95 { 96 .alloc_inode = coda_alloc_inode, 97 .destroy_inode = coda_destroy_inode, 98 .evict_inode = coda_evict_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_path.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 venus_comm *vc; 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 mutex_lock(&vc->vc_mutex); 163 164 if (!vc->vc_inuse) { 165 printk("coda_read_super: No pseudo device\n"); 166 error = -EINVAL; 167 goto unlock_out; 168 } 169 170 if (vc->vc_sb) { 171 printk("coda_read_super: Device already mounted\n"); 172 error = -EBUSY; 173 goto unlock_out; 174 } 175 176 error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY); 177 if (error) 178 goto unlock_out; 179 180 vc->vc_sb = sb; 181 mutex_unlock(&vc->vc_mutex); 182 183 sb->s_fs_info = vc; 184 sb->s_flags |= MS_NOATIME; 185 sb->s_blocksize = 4096; /* XXXXX what do we put here?? */ 186 sb->s_blocksize_bits = 12; 187 sb->s_magic = CODA_SUPER_MAGIC; 188 sb->s_op = &coda_super_operations; 189 sb->s_bdi = &vc->bdi; 190 191 /* get root fid from Venus: this needs the root inode */ 192 error = venus_rootfid(sb, &fid); 193 if ( error ) { 194 printk("coda_read_super: coda_get_rootfid failed with %d\n", 195 error); 196 goto error; 197 } 198 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid)); 199 200 /* make root inode */ 201 error = coda_cnode_make(&root, &fid, sb); 202 if ( error || !root ) { 203 printk("Failure of coda_cnode_make for root: error %d\n", error); 204 goto error; 205 } 206 207 printk("coda_read_super: rootinode is %ld dev %s\n", 208 root->i_ino, root->i_sb->s_id); 209 sb->s_root = d_alloc_root(root); 210 if (!sb->s_root) { 211 error = -EINVAL; 212 goto error; 213 } 214 return 0; 215 216 error: 217 if (root) 218 iput(root); 219 220 mutex_lock(&vc->vc_mutex); 221 bdi_destroy(&vc->bdi); 222 vc->vc_sb = NULL; 223 sb->s_fs_info = NULL; 224 unlock_out: 225 mutex_unlock(&vc->vc_mutex); 226 return error; 227 } 228 229 static void coda_put_super(struct super_block *sb) 230 { 231 struct venus_comm *vcp = coda_vcp(sb); 232 mutex_lock(&vcp->vc_mutex); 233 bdi_destroy(&vcp->bdi); 234 vcp->vc_sb = NULL; 235 sb->s_fs_info = NULL; 236 mutex_unlock(&vcp->vc_mutex); 237 238 printk("Coda: Bye bye.\n"); 239 } 240 241 static void coda_evict_inode(struct inode *inode) 242 { 243 truncate_inode_pages(&inode->i_data, 0); 244 end_writeback(inode); 245 coda_cache_clear_inode(inode); 246 } 247 248 int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 249 { 250 int err = coda_revalidate_inode(dentry); 251 if (!err) 252 generic_fillattr(dentry->d_inode, stat); 253 return err; 254 } 255 256 int coda_setattr(struct dentry *de, struct iattr *iattr) 257 { 258 struct inode *inode = de->d_inode; 259 struct coda_vattr vattr; 260 int error; 261 262 memset(&vattr, 0, sizeof(vattr)); 263 264 inode->i_ctime = CURRENT_TIME_SEC; 265 coda_iattr_to_vattr(iattr, &vattr); 266 vattr.va_type = C_VNON; /* cannot set type */ 267 268 /* Venus is responsible for truncating the container-file!!! */ 269 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr); 270 271 if (!error) { 272 coda_vattr_to_iattr(inode, &vattr); 273 coda_cache_clear_inode(inode); 274 } 275 return error; 276 } 277 278 const struct inode_operations coda_file_inode_operations = { 279 .permission = coda_permission, 280 .getattr = coda_getattr, 281 .setattr = coda_setattr, 282 }; 283 284 static int coda_statfs(struct dentry *dentry, struct kstatfs *buf) 285 { 286 int error; 287 288 error = venus_statfs(dentry, buf); 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 = 4096; 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