Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |
Adrian Bunk | c98d8cf | 2006-03-24 03:15:53 -0800 | [diff] [blame] | 34 | #include "coda_int.h" |
| 35 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 super_block *sb, 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), |
Paul Jackson | 4b6a931 | 2006-03-24 03:16:05 -0800 | [diff] [blame] | 74 | 0, SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 super_block *sb, struct kstatfs *buf) |
| 282 | { |
| 283 | int error; |
| 284 | |
| 285 | lock_kernel(); |
| 286 | |
| 287 | error = venus_statfs(sb, 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 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame^] | 310 | static int coda_get_sb(struct file_system_type *fs_type, |
| 311 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame^] | 313 | return get_sb_nodev(fs_type, flags, data, coda_fill_super, mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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 | |