David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 1 | /* AFS superblock handling |
| 2 | * |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 3 | * Copyright (c) 2002, 2007 Red Hat, Inc. All rights reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
| 5 | * This software may be freely redistributed under the terms of the |
| 6 | * GNU General Public License. |
| 7 | * |
| 8 | * You should have received a copy of the GNU General Public License |
| 9 | * along with this program; if not, write to the Free Software |
| 10 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
| 11 | * |
| 12 | * Authors: David Howells <dhowells@redhat.com> |
David Woodhouse | 44d1b98 | 2008-06-05 22:46:18 -0700 | [diff] [blame] | 13 | * David Woodhouse <dwmw2@infradead.org> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 14 | * |
| 15 | */ |
| 16 | |
| 17 | #include <linux/kernel.h> |
| 18 | #include <linux/module.h> |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 19 | #include <linux/mount.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 20 | #include <linux/init.h> |
| 21 | #include <linux/slab.h> |
Alexey Dobriyan | 405f557 | 2009-07-11 22:08:37 +0400 | [diff] [blame] | 22 | #include <linux/smp_lock.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 23 | #include <linux/fs.h> |
| 24 | #include <linux/pagemap.h> |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 25 | #include <linux/parser.h> |
David Howells | 45222b9 | 2007-05-10 22:22:20 -0700 | [diff] [blame] | 26 | #include <linux/statfs.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 27 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include "internal.h" |
| 29 | |
| 30 | #define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */ |
| 31 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 32 | static void afs_i_init_once(void *foo); |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 33 | static int afs_get_sb(struct file_system_type *fs_type, |
| 34 | int flags, const char *dev_name, |
| 35 | void *data, struct vfsmount *mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | static struct inode *afs_alloc_inode(struct super_block *sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 37 | static void afs_put_super(struct super_block *sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | static void afs_destroy_inode(struct inode *inode); |
David Howells | 45222b9 | 2007-05-10 22:22:20 -0700 | [diff] [blame] | 39 | static int afs_statfs(struct dentry *dentry, struct kstatfs *buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
Trond Myklebust | 1f5ce9e | 2006-06-09 09:34:16 -0400 | [diff] [blame] | 41 | struct file_system_type afs_fs_type = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | .owner = THIS_MODULE, |
| 43 | .name = "afs", |
| 44 | .get_sb = afs_get_sb, |
| 45 | .kill_sb = kill_anon_super, |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 46 | .fs_flags = 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | }; |
| 48 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 49 | static const struct super_operations afs_super_ops = { |
David Howells | 45222b9 | 2007-05-10 22:22:20 -0700 | [diff] [blame] | 50 | .statfs = afs_statfs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | .alloc_inode = afs_alloc_inode, |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 52 | .drop_inode = afs_drop_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 53 | .destroy_inode = afs_destroy_inode, |
Al Viro | b57922d | 2010-06-07 14:34:48 -0400 | [diff] [blame] | 54 | .evict_inode = afs_evict_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 55 | .put_super = afs_put_super, |
Miklos Szeredi | 969729d | 2008-02-08 04:21:37 -0800 | [diff] [blame] | 56 | .show_options = generic_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | }; |
| 58 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 59 | static struct kmem_cache *afs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | static atomic_t afs_count_active_inodes; |
| 61 | |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 62 | enum { |
| 63 | afs_no_opt, |
| 64 | afs_opt_cell, |
| 65 | afs_opt_rwpath, |
| 66 | afs_opt_vol, |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 67 | afs_opt_autocell, |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 68 | }; |
| 69 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 70 | static const match_table_t afs_options_list = { |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 71 | { afs_opt_cell, "cell=%s" }, |
| 72 | { afs_opt_rwpath, "rwpath" }, |
| 73 | { afs_opt_vol, "vol=%s" }, |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 74 | { afs_opt_autocell, "autocell" }, |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 75 | { afs_no_opt, NULL }, |
| 76 | }; |
| 77 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | /* |
| 79 | * initialise the filesystem |
| 80 | */ |
| 81 | int __init afs_fs_init(void) |
| 82 | { |
| 83 | int ret; |
| 84 | |
| 85 | _enter(""); |
| 86 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 87 | /* create ourselves an inode cache */ |
| 88 | atomic_set(&afs_count_active_inodes, 0); |
| 89 | |
| 90 | ret = -ENOMEM; |
| 91 | afs_inode_cachep = kmem_cache_create("afs_inode_cache", |
| 92 | sizeof(struct afs_vnode), |
| 93 | 0, |
| 94 | SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 95 | afs_i_init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | if (!afs_inode_cachep) { |
| 97 | printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n"); |
| 98 | return ret; |
| 99 | } |
| 100 | |
| 101 | /* now export our filesystem to lesser mortals */ |
| 102 | ret = register_filesystem(&afs_fs_type); |
| 103 | if (ret < 0) { |
| 104 | kmem_cache_destroy(afs_inode_cachep); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 105 | _leave(" = %d", ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 106 | return ret; |
| 107 | } |
| 108 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 109 | _leave(" = 0"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | return 0; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 111 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 113 | /* |
| 114 | * clean up the filesystem |
| 115 | */ |
| 116 | void __exit afs_fs_exit(void) |
| 117 | { |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 118 | _enter(""); |
| 119 | |
| 120 | afs_mntpt_kill_timer(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | unregister_filesystem(&afs_fs_type); |
| 122 | |
| 123 | if (atomic_read(&afs_count_active_inodes) != 0) { |
| 124 | printk("kAFS: %d active inode objects still present\n", |
| 125 | atomic_read(&afs_count_active_inodes)); |
| 126 | BUG(); |
| 127 | } |
| 128 | |
| 129 | kmem_cache_destroy(afs_inode_cachep); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 130 | _leave(""); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 131 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 132 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 134 | * parse the mount options |
| 135 | * - this function has been shamelessly adapted from the ext3 fs which |
| 136 | * shamelessly adapted it from the msdos fs |
| 137 | */ |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 138 | static int afs_parse_options(struct afs_mount_params *params, |
| 139 | char *options, const char **devname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 140 | { |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 141 | struct afs_cell *cell; |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 142 | substring_t args[MAX_OPT_ARGS]; |
| 143 | char *p; |
| 144 | int token; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 145 | |
| 146 | _enter("%s", options); |
| 147 | |
| 148 | options[PAGE_SIZE - 1] = 0; |
| 149 | |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 150 | while ((p = strsep(&options, ","))) { |
| 151 | if (!*p) |
| 152 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 153 | |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 154 | token = match_token(p, afs_options_list, args); |
| 155 | switch (token) { |
| 156 | case afs_opt_cell: |
| 157 | cell = afs_cell_lookup(args[0].from, |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 158 | args[0].to - args[0].from, |
| 159 | false); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 160 | if (IS_ERR(cell)) |
| 161 | return PTR_ERR(cell); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 162 | afs_put_cell(params->cell); |
| 163 | params->cell = cell; |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 164 | break; |
| 165 | |
| 166 | case afs_opt_rwpath: |
| 167 | params->rwpath = 1; |
| 168 | break; |
| 169 | |
| 170 | case afs_opt_vol: |
| 171 | *devname = args[0].from; |
| 172 | break; |
| 173 | |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 174 | case afs_opt_autocell: |
| 175 | params->autocell = 1; |
| 176 | break; |
| 177 | |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 178 | default: |
| 179 | printk(KERN_ERR "kAFS:" |
| 180 | " Unknown or invalid mount option: '%s'\n", p); |
| 181 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | } |
| 184 | |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 185 | _leave(" = 0"); |
| 186 | return 0; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 187 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 189 | /* |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 190 | * parse a device name to get cell name, volume name, volume type and R/W |
| 191 | * selector |
| 192 | * - this can be one of the following: |
| 193 | * "%[cell:]volume[.]" R/W volume |
| 194 | * "#[cell:]volume[.]" R/O or R/W volume (rwpath=0), |
| 195 | * or R/W (rwpath=1) volume |
| 196 | * "%[cell:]volume.readonly" R/O volume |
| 197 | * "#[cell:]volume.readonly" R/O volume |
| 198 | * "%[cell:]volume.backup" Backup volume |
| 199 | * "#[cell:]volume.backup" Backup volume |
| 200 | */ |
| 201 | static int afs_parse_device_name(struct afs_mount_params *params, |
| 202 | const char *name) |
| 203 | { |
| 204 | struct afs_cell *cell; |
| 205 | const char *cellname, *suffix; |
| 206 | int cellnamesz; |
| 207 | |
| 208 | _enter(",%s", name); |
| 209 | |
| 210 | if (!name) { |
| 211 | printk(KERN_ERR "kAFS: no volume name specified\n"); |
| 212 | return -EINVAL; |
| 213 | } |
| 214 | |
| 215 | if ((name[0] != '%' && name[0] != '#') || !name[1]) { |
| 216 | printk(KERN_ERR "kAFS: unparsable volume name\n"); |
| 217 | return -EINVAL; |
| 218 | } |
| 219 | |
| 220 | /* determine the type of volume we're looking for */ |
| 221 | params->type = AFSVL_ROVOL; |
| 222 | params->force = false; |
| 223 | if (params->rwpath || name[0] == '%') { |
| 224 | params->type = AFSVL_RWVOL; |
| 225 | params->force = true; |
| 226 | } |
| 227 | name++; |
| 228 | |
| 229 | /* split the cell name out if there is one */ |
| 230 | params->volname = strchr(name, ':'); |
| 231 | if (params->volname) { |
| 232 | cellname = name; |
| 233 | cellnamesz = params->volname - name; |
| 234 | params->volname++; |
| 235 | } else { |
| 236 | params->volname = name; |
| 237 | cellname = NULL; |
| 238 | cellnamesz = 0; |
| 239 | } |
| 240 | |
| 241 | /* the volume type is further affected by a possible suffix */ |
| 242 | suffix = strrchr(params->volname, '.'); |
| 243 | if (suffix) { |
| 244 | if (strcmp(suffix, ".readonly") == 0) { |
| 245 | params->type = AFSVL_ROVOL; |
| 246 | params->force = true; |
| 247 | } else if (strcmp(suffix, ".backup") == 0) { |
| 248 | params->type = AFSVL_BACKVOL; |
| 249 | params->force = true; |
| 250 | } else if (suffix[1] == 0) { |
| 251 | } else { |
| 252 | suffix = NULL; |
| 253 | } |
| 254 | } |
| 255 | |
| 256 | params->volnamesz = suffix ? |
| 257 | suffix - params->volname : strlen(params->volname); |
| 258 | |
| 259 | _debug("cell %*.*s [%p]", |
| 260 | cellnamesz, cellnamesz, cellname ?: "", params->cell); |
| 261 | |
| 262 | /* lookup the cell record */ |
| 263 | if (cellname || !params->cell) { |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 264 | cell = afs_cell_lookup(cellname, cellnamesz, true); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 265 | if (IS_ERR(cell)) { |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 266 | printk(KERN_ERR "kAFS: unable to lookup cell '%*.*s'\n", |
| 267 | cellnamesz, cellnamesz, cellname ?: ""); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 268 | return PTR_ERR(cell); |
| 269 | } |
| 270 | afs_put_cell(params->cell); |
| 271 | params->cell = cell; |
| 272 | } |
| 273 | |
| 274 | _debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s", |
| 275 | params->cell->name, params->cell, |
| 276 | params->volnamesz, params->volnamesz, params->volname, |
| 277 | suffix ?: "-", params->type, params->force ? " FORCE" : ""); |
| 278 | |
| 279 | return 0; |
| 280 | } |
| 281 | |
| 282 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 283 | * check a superblock to see if it's the one we're looking for |
| 284 | */ |
| 285 | static int afs_test_super(struct super_block *sb, void *data) |
| 286 | { |
| 287 | struct afs_mount_params *params = data; |
| 288 | struct afs_super_info *as = sb->s_fs_info; |
| 289 | |
| 290 | return as->volume == params->volume; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 291 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | /* |
| 294 | * fill in the superblock |
| 295 | */ |
David Howells | 436058a | 2007-04-26 15:56:24 -0700 | [diff] [blame] | 296 | static int afs_fill_super(struct super_block *sb, void *data) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | { |
| 298 | struct afs_mount_params *params = data; |
| 299 | struct afs_super_info *as = NULL; |
| 300 | struct afs_fid fid; |
| 301 | struct dentry *root = NULL; |
| 302 | struct inode *inode = NULL; |
| 303 | int ret; |
| 304 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 305 | _enter(""); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | |
| 307 | /* allocate a superblock info record */ |
Yan Burman | b593e48 | 2006-12-06 20:40:32 -0800 | [diff] [blame] | 308 | as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | if (!as) { |
| 310 | _leave(" = -ENOMEM"); |
| 311 | return -ENOMEM; |
| 312 | } |
| 313 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 314 | afs_get_volume(params->volume); |
| 315 | as->volume = params->volume; |
| 316 | |
| 317 | /* fill in the superblock */ |
| 318 | sb->s_blocksize = PAGE_CACHE_SIZE; |
| 319 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 320 | sb->s_magic = AFS_FS_MAGIC; |
| 321 | sb->s_op = &afs_super_ops; |
| 322 | sb->s_fs_info = as; |
Jens Axboe | e1da022 | 2010-04-22 11:58:18 +0200 | [diff] [blame] | 323 | sb->s_bdi = &as->volume->bdi; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 324 | |
| 325 | /* allocate the root inode and dentry */ |
| 326 | fid.vid = as->volume->vid; |
| 327 | fid.vnode = 1; |
| 328 | fid.unique = 1; |
David Howells | 260a980 | 2007-04-26 15:59:35 -0700 | [diff] [blame] | 329 | inode = afs_iget(sb, params->key, &fid, NULL, NULL); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 330 | if (IS_ERR(inode)) |
| 331 | goto error_inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 332 | |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 333 | if (params->autocell) |
| 334 | set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags); |
| 335 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 336 | ret = -ENOMEM; |
| 337 | root = d_alloc_root(inode); |
| 338 | if (!root) |
| 339 | goto error; |
| 340 | |
| 341 | sb->s_root = root; |
| 342 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 343 | _leave(" = 0"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 344 | return 0; |
| 345 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 346 | error_inode: |
| 347 | ret = PTR_ERR(inode); |
| 348 | inode = NULL; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 349 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | iput(inode); |
| 351 | afs_put_volume(as->volume); |
| 352 | kfree(as); |
| 353 | |
| 354 | sb->s_fs_info = NULL; |
| 355 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 356 | _leave(" = %d", ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | return ret; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 358 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 360 | /* |
| 361 | * get an AFS superblock |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 362 | */ |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 363 | static int afs_get_sb(struct file_system_type *fs_type, |
| 364 | int flags, |
| 365 | const char *dev_name, |
| 366 | void *options, |
| 367 | struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 368 | { |
| 369 | struct afs_mount_params params; |
| 370 | struct super_block *sb; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 371 | struct afs_volume *vol; |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 372 | struct key *key; |
Miklos Szeredi | 969729d | 2008-02-08 04:21:37 -0800 | [diff] [blame] | 373 | char *new_opts = kstrdup(options, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 374 | int ret; |
| 375 | |
| 376 | _enter(",,%s,%p", dev_name, options); |
| 377 | |
| 378 | memset(¶ms, 0, sizeof(params)); |
| 379 | |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 380 | /* parse the options and device name */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 381 | if (options) { |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 382 | ret = afs_parse_options(¶ms, options, &dev_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | if (ret < 0) |
| 384 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 385 | } |
| 386 | |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 387 | ret = afs_parse_device_name(¶ms, dev_name); |
| 388 | if (ret < 0) |
| 389 | goto error; |
| 390 | |
| 391 | /* try and do the mount securely */ |
| 392 | key = afs_request_key(params.cell); |
| 393 | if (IS_ERR(key)) { |
| 394 | _leave(" = %ld [key]", PTR_ERR(key)); |
| 395 | ret = PTR_ERR(key); |
| 396 | goto error; |
| 397 | } |
| 398 | params.key = key; |
| 399 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | /* parse the device name */ |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 401 | vol = afs_volume_lookup(¶ms); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 402 | if (IS_ERR(vol)) { |
| 403 | ret = PTR_ERR(vol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 404 | goto error; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 405 | } |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 406 | params.volume = vol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 407 | |
| 408 | /* allocate a deviceless superblock */ |
| 409 | sb = sget(fs_type, afs_test_super, set_anon_super, ¶ms); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 410 | if (IS_ERR(sb)) { |
| 411 | ret = PTR_ERR(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | goto error; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 413 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 414 | |
David Howells | 436058a | 2007-04-26 15:56:24 -0700 | [diff] [blame] | 415 | if (!sb->s_root) { |
| 416 | /* initial superblock/root creation */ |
| 417 | _debug("create"); |
| 418 | sb->s_flags = flags; |
| 419 | ret = afs_fill_super(sb, ¶ms); |
| 420 | if (ret < 0) { |
Al Viro | 6f5bbff | 2009-05-06 01:34:22 -0400 | [diff] [blame] | 421 | deactivate_locked_super(sb); |
David Howells | 436058a | 2007-04-26 15:56:24 -0700 | [diff] [blame] | 422 | goto error; |
| 423 | } |
Al Viro | 2a32ceb | 2009-05-08 16:05:57 -0400 | [diff] [blame] | 424 | save_mount_options(sb, new_opts); |
David Howells | 436058a | 2007-04-26 15:56:24 -0700 | [diff] [blame] | 425 | sb->s_flags |= MS_ACTIVE; |
| 426 | } else { |
| 427 | _debug("reuse"); |
| 428 | ASSERTCMP(sb->s_flags, &, MS_ACTIVE); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 429 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | |
David Howells | 436058a | 2007-04-26 15:56:24 -0700 | [diff] [blame] | 431 | simple_set_mnt(mnt, sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 432 | afs_put_volume(params.volume); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 433 | afs_put_cell(params.cell); |
Al Viro | 2a32ceb | 2009-05-08 16:05:57 -0400 | [diff] [blame] | 434 | kfree(new_opts); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 435 | _leave(" = 0 [%p]", sb); |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 436 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 438 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | afs_put_volume(params.volume); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 440 | afs_put_cell(params.cell); |
| 441 | key_put(params.key); |
Miklos Szeredi | 969729d | 2008-02-08 04:21:37 -0800 | [diff] [blame] | 442 | kfree(new_opts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 443 | _leave(" = %d", ret); |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 444 | return ret; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 445 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 446 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | /* |
| 448 | * finish the unmounting process on the superblock |
| 449 | */ |
| 450 | static void afs_put_super(struct super_block *sb) |
| 451 | { |
| 452 | struct afs_super_info *as = sb->s_fs_info; |
| 453 | |
| 454 | _enter(""); |
| 455 | |
Christoph Hellwig | 6cfd014 | 2009-05-05 15:40:36 +0200 | [diff] [blame] | 456 | lock_kernel(); |
| 457 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 458 | afs_put_volume(as->volume); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 459 | |
Christoph Hellwig | 6cfd014 | 2009-05-05 15:40:36 +0200 | [diff] [blame] | 460 | unlock_kernel(); |
| 461 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 462 | _leave(""); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 463 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 464 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 465 | /* |
| 466 | * initialise an inode cache slab element prior to any use |
| 467 | */ |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 468 | static void afs_i_init_once(void *_vnode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | { |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 470 | struct afs_vnode *vnode = _vnode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 471 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 472 | memset(vnode, 0, sizeof(*vnode)); |
| 473 | inode_init_once(&vnode->vfs_inode); |
| 474 | init_waitqueue_head(&vnode->update_waitq); |
| 475 | mutex_init(&vnode->permits_lock); |
| 476 | mutex_init(&vnode->validate_lock); |
| 477 | spin_lock_init(&vnode->writeback_lock); |
| 478 | spin_lock_init(&vnode->lock); |
| 479 | INIT_LIST_HEAD(&vnode->writebacks); |
David Howells | e8d6c55 | 2007-07-15 23:40:12 -0700 | [diff] [blame] | 480 | INIT_LIST_HEAD(&vnode->pending_locks); |
| 481 | INIT_LIST_HEAD(&vnode->granted_locks); |
| 482 | INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work); |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 483 | INIT_WORK(&vnode->cb_broken_work, afs_broken_callback_work); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 484 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 486 | /* |
| 487 | * allocate an AFS inode struct from our slab cache |
| 488 | */ |
| 489 | static struct inode *afs_alloc_inode(struct super_block *sb) |
| 490 | { |
| 491 | struct afs_vnode *vnode; |
| 492 | |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 493 | vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | if (!vnode) |
| 495 | return NULL; |
| 496 | |
| 497 | atomic_inc(&afs_count_active_inodes); |
| 498 | |
| 499 | memset(&vnode->fid, 0, sizeof(vnode->fid)); |
| 500 | memset(&vnode->status, 0, sizeof(vnode->status)); |
| 501 | |
| 502 | vnode->volume = NULL; |
| 503 | vnode->update_cnt = 0; |
David Howells | 260a980 | 2007-04-26 15:59:35 -0700 | [diff] [blame] | 504 | vnode->flags = 1 << AFS_VNODE_UNSET; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 505 | vnode->cb_promised = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 506 | |
David Howells | 0f300ca | 2007-05-10 22:22:20 -0700 | [diff] [blame] | 507 | _leave(" = %p", &vnode->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 508 | return &vnode->vfs_inode; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 509 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 510 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 511 | /* |
| 512 | * destroy an AFS inode struct |
| 513 | */ |
| 514 | static void afs_destroy_inode(struct inode *inode) |
| 515 | { |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 516 | struct afs_vnode *vnode = AFS_FS_I(inode); |
| 517 | |
David Howells | 0f300ca | 2007-05-10 22:22:20 -0700 | [diff] [blame] | 518 | _enter("%p{%x:%u}", inode, vnode->fid.vid, vnode->fid.vnode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 519 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 520 | _debug("DESTROY INODE %p", inode); |
| 521 | |
| 522 | ASSERTCMP(vnode->server, ==, NULL); |
| 523 | |
| 524 | kmem_cache_free(afs_inode_cachep, vnode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 525 | atomic_dec(&afs_count_active_inodes); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 526 | } |
David Howells | 45222b9 | 2007-05-10 22:22:20 -0700 | [diff] [blame] | 527 | |
| 528 | /* |
| 529 | * return information about an AFS volume |
| 530 | */ |
| 531 | static int afs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 532 | { |
| 533 | struct afs_volume_status vs; |
| 534 | struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode); |
| 535 | struct key *key; |
| 536 | int ret; |
| 537 | |
| 538 | key = afs_request_key(vnode->volume->cell); |
| 539 | if (IS_ERR(key)) |
| 540 | return PTR_ERR(key); |
| 541 | |
| 542 | ret = afs_vnode_get_volume_status(vnode, key, &vs); |
| 543 | key_put(key); |
| 544 | if (ret < 0) { |
| 545 | _leave(" = %d", ret); |
| 546 | return ret; |
| 547 | } |
| 548 | |
| 549 | buf->f_type = dentry->d_sb->s_magic; |
| 550 | buf->f_bsize = AFS_BLOCK_SIZE; |
| 551 | buf->f_namelen = AFSNAMEMAX - 1; |
| 552 | |
| 553 | if (vs.max_quota == 0) |
| 554 | buf->f_blocks = vs.part_max_blocks; |
| 555 | else |
| 556 | buf->f_blocks = vs.max_quota; |
| 557 | buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use; |
| 558 | return 0; |
| 559 | } |