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 */ 38static void coda_evict_inode(struct inode *); 39static void coda_put_super(struct super_block *); 40static int coda_statfs(struct dentry *dentry, struct kstatfs *buf); 41 42static struct kmem_cache * coda_inode_cachep; 43 44static 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 57static void coda_destroy_inode(struct inode *inode) 58{ 59 kmem_cache_free(coda_inode_cachep, ITOC(inode)); 60} 61 62static 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 69int 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 80void coda_destroy_inodecache(void) 81{ 82 kmem_cache_destroy(coda_inode_cachep); 83} 84 85static int coda_remount(struct super_block *sb, int *flags, char *data) 86{ 87 *flags |= MS_NOATIME; 88 return 0; 89} 90 91/* exported operations */ 92static 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 102static 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 143static 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 idx = get_device_index((struct coda_mount_data *) data); 152 153 /* Ignore errors in data, for backward compatibility */ 154 if(idx == -1) 155 idx = 0; 156 157 printk(KERN_INFO "coda_read_super: device index: %i\n", idx); 158 159 vc = &coda_comms[idx]; 160 if (!vc->vc_inuse) { 161 printk("coda_read_super: No pseudo device\n"); 162 return -EINVAL; 163 } 164 165 if ( vc->vc_sb ) { 166 printk("coda_read_super: Device already mounted\n"); 167 return -EBUSY; 168 } 169 170 error = bdi_setup_and_register(&vc->bdi, "coda", BDI_CAP_MAP_COPY); 171 if (error) 172 goto bdi_err; 173 174 vc->vc_sb = sb; 175 176 sb->s_fs_info = vc; 177 sb->s_flags |= MS_NOATIME; 178 sb->s_blocksize = 4096; /* XXXXX what do we put here?? */ 179 sb->s_blocksize_bits = 12; 180 sb->s_magic = CODA_SUPER_MAGIC; 181 sb->s_op = &coda_super_operations; 182 sb->s_bdi = &vc->bdi; 183 184 /* get root fid from Venus: this needs the root inode */ 185 error = venus_rootfid(sb, &fid); 186 if ( error ) { 187 printk("coda_read_super: coda_get_rootfid failed with %d\n", 188 error); 189 goto error; 190 } 191 printk("coda_read_super: rootfid is %s\n", coda_f2s(&fid)); 192 193 /* make root inode */ 194 error = coda_cnode_make(&root, &fid, sb); 195 if ( error || !root ) { 196 printk("Failure of coda_cnode_make for root: error %d\n", error); 197 goto error; 198 } 199 200 printk("coda_read_super: rootinode is %ld dev %s\n", 201 root->i_ino, root->i_sb->s_id); 202 sb->s_root = d_alloc_root(root); 203 if (!sb->s_root) 204 goto error; 205 return 0; 206 207 error: 208 bdi_destroy(&vc->bdi); 209 bdi_err: 210 if (root) 211 iput(root); 212 if (vc) 213 vc->vc_sb = NULL; 214 215 return -EINVAL; 216} 217 218static void coda_put_super(struct super_block *sb) 219{ 220 bdi_destroy(&coda_vcp(sb)->bdi); 221 coda_vcp(sb)->vc_sb = NULL; 222 sb->s_fs_info = NULL; 223 224 printk("Coda: Bye bye.\n"); 225} 226 227static void coda_evict_inode(struct inode *inode) 228{ 229 truncate_inode_pages(&inode->i_data, 0); 230 end_writeback(inode); 231 coda_cache_clear_inode(inode); 232} 233 234int coda_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat) 235{ 236 int err = coda_revalidate_inode(dentry); 237 if (!err) 238 generic_fillattr(dentry->d_inode, stat); 239 return err; 240} 241 242int coda_setattr(struct dentry *de, struct iattr *iattr) 243{ 244 struct inode *inode = de->d_inode; 245 struct coda_vattr vattr; 246 int error; 247 248 lock_kernel(); 249 250 memset(&vattr, 0, sizeof(vattr)); 251 252 inode->i_ctime = CURRENT_TIME_SEC; 253 coda_iattr_to_vattr(iattr, &vattr); 254 vattr.va_type = C_VNON; /* cannot set type */ 255 256 /* Venus is responsible for truncating the container-file!!! */ 257 error = venus_setattr(inode->i_sb, coda_i2f(inode), &vattr); 258 259 if ( !error ) { 260 coda_vattr_to_iattr(inode, &vattr); 261 coda_cache_clear_inode(inode); 262 } 263 264 unlock_kernel(); 265 266 return error; 267} 268 269const struct inode_operations coda_file_inode_operations = { 270 .permission = coda_permission, 271 .getattr = coda_getattr, 272 .setattr = coda_setattr, 273}; 274 275static int coda_statfs(struct dentry *dentry, struct kstatfs *buf) 276{ 277 int error; 278 279 lock_kernel(); 280 281 error = venus_statfs(dentry, buf); 282 283 unlock_kernel(); 284 285 if (error) { 286 /* fake something like AFS does */ 287 buf->f_blocks = 9000000; 288 buf->f_bfree = 9000000; 289 buf->f_bavail = 9000000; 290 buf->f_files = 9000000; 291 buf->f_ffree = 9000000; 292 } 293 294 /* and fill in the rest */ 295 buf->f_type = CODA_SUPER_MAGIC; 296 buf->f_bsize = 4096; 297 buf->f_namelen = CODA_MAXNAMLEN; 298 299 return 0; 300} 301 302/* init_coda: used by filesystems.c to register coda */ 303 304static int coda_get_sb(struct file_system_type *fs_type, 305 int flags, const char *dev_name, void *data, struct vfsmount *mnt) 306{ 307 return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt); 308} 309 310struct file_system_type coda_fs_type = { 311 .owner = THIS_MODULE, 312 .name = "coda", 313 .get_sb = coda_get_sb, 314 .kill_sb = kill_anon_super, 315 .fs_flags = FS_BINARY_MOUNTDATA, 316}; 317