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> |
| 22 | #include <linux/fs.h> |
| 23 | #include <linux/pagemap.h> |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 24 | #include <linux/parser.h> |
David Howells | 45222b9 | 2007-05-10 22:22:20 -0700 | [diff] [blame] | 25 | #include <linux/statfs.h> |
Alexey Dobriyan | e8edc6e | 2007-05-21 01:22:52 +0400 | [diff] [blame] | 26 | #include <linux/sched.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include "internal.h" |
| 28 | |
| 29 | #define AFS_FS_MAGIC 0x6B414653 /* 'kAFS' */ |
| 30 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 31 | static void afs_i_init_once(void *foo); |
Al Viro | f7442b3 | 2010-07-26 14:16:21 +0400 | [diff] [blame] | 32 | static struct dentry *afs_mount(struct file_system_type *fs_type, |
| 33 | int flags, const char *dev_name, void *data); |
Al Viro | dde194a | 2011-06-12 16:01:21 -0400 | [diff] [blame] | 34 | static void afs_kill_super(struct super_block *sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | static struct inode *afs_alloc_inode(struct super_block *sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | static void afs_destroy_inode(struct inode *inode); |
David Howells | 45222b9 | 2007-05-10 22:22:20 -0700 | [diff] [blame] | 37 | static int afs_statfs(struct dentry *dentry, struct kstatfs *buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 38 | |
Trond Myklebust | 1f5ce9e | 2006-06-09 09:34:16 -0400 | [diff] [blame] | 39 | struct file_system_type afs_fs_type = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | .owner = THIS_MODULE, |
| 41 | .name = "afs", |
Al Viro | f7442b3 | 2010-07-26 14:16:21 +0400 | [diff] [blame] | 42 | .mount = afs_mount, |
Al Viro | dde194a | 2011-06-12 16:01:21 -0400 | [diff] [blame] | 43 | .kill_sb = afs_kill_super, |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 44 | .fs_flags = 0, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | }; |
| 46 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 47 | static const struct super_operations afs_super_ops = { |
David Howells | 45222b9 | 2007-05-10 22:22:20 -0700 | [diff] [blame] | 48 | .statfs = afs_statfs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | .alloc_inode = afs_alloc_inode, |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 50 | .drop_inode = afs_drop_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | .destroy_inode = afs_destroy_inode, |
Al Viro | b57922d | 2010-06-07 14:34:48 -0400 | [diff] [blame] | 52 | .evict_inode = afs_evict_inode, |
Miklos Szeredi | 969729d | 2008-02-08 04:21:37 -0800 | [diff] [blame] | 53 | .show_options = generic_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 54 | }; |
| 55 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 56 | static struct kmem_cache *afs_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | static atomic_t afs_count_active_inodes; |
| 58 | |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 59 | enum { |
| 60 | afs_no_opt, |
| 61 | afs_opt_cell, |
| 62 | afs_opt_rwpath, |
| 63 | afs_opt_vol, |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 64 | afs_opt_autocell, |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 65 | }; |
| 66 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 67 | static const match_table_t afs_options_list = { |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 68 | { afs_opt_cell, "cell=%s" }, |
| 69 | { afs_opt_rwpath, "rwpath" }, |
| 70 | { afs_opt_vol, "vol=%s" }, |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 71 | { afs_opt_autocell, "autocell" }, |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 72 | { afs_no_opt, NULL }, |
| 73 | }; |
| 74 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 75 | /* |
| 76 | * initialise the filesystem |
| 77 | */ |
| 78 | int __init afs_fs_init(void) |
| 79 | { |
| 80 | int ret; |
| 81 | |
| 82 | _enter(""); |
| 83 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | /* create ourselves an inode cache */ |
| 85 | atomic_set(&afs_count_active_inodes, 0); |
| 86 | |
| 87 | ret = -ENOMEM; |
| 88 | afs_inode_cachep = kmem_cache_create("afs_inode_cache", |
| 89 | sizeof(struct afs_vnode), |
| 90 | 0, |
| 91 | SLAB_HWCACHE_ALIGN, |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 92 | afs_i_init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 93 | if (!afs_inode_cachep) { |
| 94 | printk(KERN_NOTICE "kAFS: Failed to allocate inode cache\n"); |
| 95 | return ret; |
| 96 | } |
| 97 | |
| 98 | /* now export our filesystem to lesser mortals */ |
| 99 | ret = register_filesystem(&afs_fs_type); |
| 100 | if (ret < 0) { |
| 101 | kmem_cache_destroy(afs_inode_cachep); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 102 | _leave(" = %d", ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 103 | return ret; |
| 104 | } |
| 105 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 106 | _leave(" = 0"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 107 | return 0; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 108 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 109 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 110 | /* |
| 111 | * clean up the filesystem |
| 112 | */ |
| 113 | void __exit afs_fs_exit(void) |
| 114 | { |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 115 | _enter(""); |
| 116 | |
| 117 | afs_mntpt_kill_timer(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 118 | unregister_filesystem(&afs_fs_type); |
| 119 | |
| 120 | if (atomic_read(&afs_count_active_inodes) != 0) { |
| 121 | printk("kAFS: %d active inode objects still present\n", |
| 122 | atomic_read(&afs_count_active_inodes)); |
| 123 | BUG(); |
| 124 | } |
| 125 | |
| 126 | kmem_cache_destroy(afs_inode_cachep); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 127 | _leave(""); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 128 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 129 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 130 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 131 | * parse the mount options |
| 132 | * - this function has been shamelessly adapted from the ext3 fs which |
| 133 | * shamelessly adapted it from the msdos fs |
| 134 | */ |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 135 | static int afs_parse_options(struct afs_mount_params *params, |
| 136 | char *options, const char **devname) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 137 | { |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 138 | struct afs_cell *cell; |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 139 | substring_t args[MAX_OPT_ARGS]; |
| 140 | char *p; |
| 141 | int token; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
| 143 | _enter("%s", options); |
| 144 | |
| 145 | options[PAGE_SIZE - 1] = 0; |
| 146 | |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 147 | while ((p = strsep(&options, ","))) { |
| 148 | if (!*p) |
| 149 | continue; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 150 | |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 151 | token = match_token(p, afs_options_list, args); |
| 152 | switch (token) { |
| 153 | case afs_opt_cell: |
| 154 | cell = afs_cell_lookup(args[0].from, |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 155 | args[0].to - args[0].from, |
| 156 | false); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 157 | if (IS_ERR(cell)) |
| 158 | return PTR_ERR(cell); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 159 | afs_put_cell(params->cell); |
| 160 | params->cell = cell; |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 161 | break; |
| 162 | |
| 163 | case afs_opt_rwpath: |
| 164 | params->rwpath = 1; |
| 165 | break; |
| 166 | |
| 167 | case afs_opt_vol: |
| 168 | *devname = args[0].from; |
| 169 | break; |
| 170 | |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 171 | case afs_opt_autocell: |
| 172 | params->autocell = 1; |
| 173 | break; |
| 174 | |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 175 | default: |
| 176 | printk(KERN_ERR "kAFS:" |
| 177 | " Unknown or invalid mount option: '%s'\n", p); |
| 178 | return -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 180 | } |
| 181 | |
David Howells | 80c72fe | 2007-05-03 03:11:29 -0700 | [diff] [blame] | 182 | _leave(" = 0"); |
| 183 | return 0; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 184 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 185 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 186 | /* |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 187 | * parse a device name to get cell name, volume name, volume type and R/W |
| 188 | * selector |
| 189 | * - this can be one of the following: |
| 190 | * "%[cell:]volume[.]" R/W volume |
| 191 | * "#[cell:]volume[.]" R/O or R/W volume (rwpath=0), |
| 192 | * or R/W (rwpath=1) volume |
| 193 | * "%[cell:]volume.readonly" R/O volume |
| 194 | * "#[cell:]volume.readonly" R/O volume |
| 195 | * "%[cell:]volume.backup" Backup volume |
| 196 | * "#[cell:]volume.backup" Backup volume |
| 197 | */ |
| 198 | static int afs_parse_device_name(struct afs_mount_params *params, |
| 199 | const char *name) |
| 200 | { |
| 201 | struct afs_cell *cell; |
| 202 | const char *cellname, *suffix; |
| 203 | int cellnamesz; |
| 204 | |
| 205 | _enter(",%s", name); |
| 206 | |
| 207 | if (!name) { |
| 208 | printk(KERN_ERR "kAFS: no volume name specified\n"); |
| 209 | return -EINVAL; |
| 210 | } |
| 211 | |
| 212 | if ((name[0] != '%' && name[0] != '#') || !name[1]) { |
| 213 | printk(KERN_ERR "kAFS: unparsable volume name\n"); |
| 214 | return -EINVAL; |
| 215 | } |
| 216 | |
| 217 | /* determine the type of volume we're looking for */ |
| 218 | params->type = AFSVL_ROVOL; |
| 219 | params->force = false; |
| 220 | if (params->rwpath || name[0] == '%') { |
| 221 | params->type = AFSVL_RWVOL; |
| 222 | params->force = true; |
| 223 | } |
| 224 | name++; |
| 225 | |
| 226 | /* split the cell name out if there is one */ |
| 227 | params->volname = strchr(name, ':'); |
| 228 | if (params->volname) { |
| 229 | cellname = name; |
| 230 | cellnamesz = params->volname - name; |
| 231 | params->volname++; |
| 232 | } else { |
| 233 | params->volname = name; |
| 234 | cellname = NULL; |
| 235 | cellnamesz = 0; |
| 236 | } |
| 237 | |
| 238 | /* the volume type is further affected by a possible suffix */ |
| 239 | suffix = strrchr(params->volname, '.'); |
| 240 | if (suffix) { |
| 241 | if (strcmp(suffix, ".readonly") == 0) { |
| 242 | params->type = AFSVL_ROVOL; |
| 243 | params->force = true; |
| 244 | } else if (strcmp(suffix, ".backup") == 0) { |
| 245 | params->type = AFSVL_BACKVOL; |
| 246 | params->force = true; |
| 247 | } else if (suffix[1] == 0) { |
| 248 | } else { |
| 249 | suffix = NULL; |
| 250 | } |
| 251 | } |
| 252 | |
| 253 | params->volnamesz = suffix ? |
| 254 | suffix - params->volname : strlen(params->volname); |
| 255 | |
| 256 | _debug("cell %*.*s [%p]", |
| 257 | cellnamesz, cellnamesz, cellname ?: "", params->cell); |
| 258 | |
| 259 | /* lookup the cell record */ |
| 260 | if (cellname || !params->cell) { |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 261 | cell = afs_cell_lookup(cellname, cellnamesz, true); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 262 | if (IS_ERR(cell)) { |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 263 | printk(KERN_ERR "kAFS: unable to lookup cell '%*.*s'\n", |
| 264 | cellnamesz, cellnamesz, cellname ?: ""); |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 265 | return PTR_ERR(cell); |
| 266 | } |
| 267 | afs_put_cell(params->cell); |
| 268 | params->cell = cell; |
| 269 | } |
| 270 | |
| 271 | _debug("CELL:%s [%p] VOLUME:%*.*s SUFFIX:%s TYPE:%d%s", |
| 272 | params->cell->name, params->cell, |
| 273 | params->volnamesz, params->volnamesz, params->volname, |
| 274 | suffix ?: "-", params->type, params->force ? " FORCE" : ""); |
| 275 | |
| 276 | return 0; |
| 277 | } |
| 278 | |
| 279 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 280 | * check a superblock to see if it's the one we're looking for |
| 281 | */ |
| 282 | static int afs_test_super(struct super_block *sb, void *data) |
| 283 | { |
Al Viro | dde194a | 2011-06-12 16:01:21 -0400 | [diff] [blame] | 284 | struct afs_super_info *as1 = data; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | struct afs_super_info *as = sb->s_fs_info; |
| 286 | |
Al Viro | dde194a | 2011-06-12 16:01:21 -0400 | [diff] [blame] | 287 | return as->volume == as1->volume; |
| 288 | } |
| 289 | |
| 290 | static int afs_set_super(struct super_block *sb, void *data) |
| 291 | { |
| 292 | sb->s_fs_info = data; |
| 293 | return set_anon_super(sb, NULL); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 294 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | /* |
| 297 | * fill in the superblock |
| 298 | */ |
Al Viro | dde194a | 2011-06-12 16:01:21 -0400 | [diff] [blame] | 299 | static int afs_fill_super(struct super_block *sb, |
| 300 | struct afs_mount_params *params) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | { |
Al Viro | dde194a | 2011-06-12 16:01:21 -0400 | [diff] [blame] | 302 | struct afs_super_info *as = sb->s_fs_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | struct afs_fid fid; |
| 304 | struct dentry *root = NULL; |
| 305 | struct inode *inode = NULL; |
| 306 | int ret; |
| 307 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 308 | _enter(""); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 310 | /* fill in the superblock */ |
| 311 | sb->s_blocksize = PAGE_CACHE_SIZE; |
| 312 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
| 313 | sb->s_magic = AFS_FS_MAGIC; |
| 314 | sb->s_op = &afs_super_ops; |
Jens Axboe | e1da022 | 2010-04-22 11:58:18 +0200 | [diff] [blame] | 315 | sb->s_bdi = &as->volume->bdi; |
David Howells | 2e41ae2 | 2011-06-14 00:38:44 +0100 | [diff] [blame] | 316 | strlcpy(sb->s_id, as->volume->vlocation->vldb.name, sizeof(sb->s_id)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | |
| 318 | /* allocate the root inode and dentry */ |
| 319 | fid.vid = as->volume->vid; |
| 320 | fid.vnode = 1; |
| 321 | fid.unique = 1; |
David Howells | 260a980 | 2007-04-26 15:59:35 -0700 | [diff] [blame] | 322 | inode = afs_iget(sb, params->key, &fid, NULL, NULL); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 323 | if (IS_ERR(inode)) |
Al Viro | dde194a | 2011-06-12 16:01:21 -0400 | [diff] [blame] | 324 | return PTR_ERR(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 325 | |
wanglei | bec5eb6 | 2010-08-11 09:38:04 +0100 | [diff] [blame] | 326 | if (params->autocell) |
| 327 | set_bit(AFS_VNODE_AUTOCELL, &AFS_FS_I(inode)->flags); |
| 328 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 329 | ret = -ENOMEM; |
| 330 | root = d_alloc_root(inode); |
| 331 | if (!root) |
| 332 | goto error; |
| 333 | |
Al Viro | d61dcce | 2011-01-12 20:04:20 -0500 | [diff] [blame] | 334 | sb->s_d_op = &afs_fs_dentry_operations; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 335 | sb->s_root = root; |
| 336 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 337 | _leave(" = 0"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 338 | return 0; |
| 339 | |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 340 | error: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 341 | iput(inode); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 342 | _leave(" = %d", ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 343 | return ret; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 344 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 345 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 346 | /* |
| 347 | * get an AFS superblock |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | */ |
Al Viro | f7442b3 | 2010-07-26 14:16:21 +0400 | [diff] [blame] | 349 | static struct dentry *afs_mount(struct file_system_type *fs_type, |
| 350 | int flags, const char *dev_name, void *options) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | { |
| 352 | struct afs_mount_params params; |
| 353 | struct super_block *sb; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 354 | struct afs_volume *vol; |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 355 | struct key *key; |
Miklos Szeredi | 969729d | 2008-02-08 04:21:37 -0800 | [diff] [blame] | 356 | char *new_opts = kstrdup(options, GFP_KERNEL); |
Al Viro | dde194a | 2011-06-12 16:01:21 -0400 | [diff] [blame] | 357 | struct afs_super_info *as; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 358 | int ret; |
| 359 | |
| 360 | _enter(",,%s,%p", dev_name, options); |
| 361 | |
| 362 | memset(¶ms, 0, sizeof(params)); |
| 363 | |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 364 | /* parse the options and device name */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | if (options) { |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 366 | ret = afs_parse_options(¶ms, options, &dev_name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | if (ret < 0) |
| 368 | goto error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 369 | } |
| 370 | |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 371 | ret = afs_parse_device_name(¶ms, dev_name); |
| 372 | if (ret < 0) |
| 373 | goto error; |
| 374 | |
| 375 | /* try and do the mount securely */ |
| 376 | key = afs_request_key(params.cell); |
| 377 | if (IS_ERR(key)) { |
| 378 | _leave(" = %ld [key]", PTR_ERR(key)); |
| 379 | ret = PTR_ERR(key); |
| 380 | goto error; |
| 381 | } |
| 382 | params.key = key; |
| 383 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 384 | /* parse the device name */ |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 385 | vol = afs_volume_lookup(¶ms); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 386 | if (IS_ERR(vol)) { |
| 387 | ret = PTR_ERR(vol); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 388 | goto error; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 389 | } |
Al Viro | dde194a | 2011-06-12 16:01:21 -0400 | [diff] [blame] | 390 | |
| 391 | /* allocate a superblock info record */ |
| 392 | as = kzalloc(sizeof(struct afs_super_info), GFP_KERNEL); |
| 393 | if (!as) { |
| 394 | ret = -ENOMEM; |
| 395 | afs_put_volume(vol); |
| 396 | goto error; |
| 397 | } |
| 398 | as->volume = vol; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 399 | |
| 400 | /* allocate a deviceless superblock */ |
Al Viro | dde194a | 2011-06-12 16:01:21 -0400 | [diff] [blame] | 401 | sb = sget(fs_type, afs_test_super, afs_set_super, as); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 402 | if (IS_ERR(sb)) { |
| 403 | ret = PTR_ERR(sb); |
Al Viro | dde194a | 2011-06-12 16:01:21 -0400 | [diff] [blame] | 404 | afs_put_volume(vol); |
| 405 | kfree(as); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 406 | goto error; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 407 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 408 | |
David Howells | 436058a | 2007-04-26 15:56:24 -0700 | [diff] [blame] | 409 | if (!sb->s_root) { |
| 410 | /* initial superblock/root creation */ |
| 411 | _debug("create"); |
| 412 | sb->s_flags = flags; |
| 413 | ret = afs_fill_super(sb, ¶ms); |
| 414 | if (ret < 0) { |
Al Viro | 6f5bbff | 2009-05-06 01:34:22 -0400 | [diff] [blame] | 415 | deactivate_locked_super(sb); |
David Howells | 436058a | 2007-04-26 15:56:24 -0700 | [diff] [blame] | 416 | goto error; |
| 417 | } |
Al Viro | 2a32ceb | 2009-05-08 16:05:57 -0400 | [diff] [blame] | 418 | save_mount_options(sb, new_opts); |
David Howells | 436058a | 2007-04-26 15:56:24 -0700 | [diff] [blame] | 419 | sb->s_flags |= MS_ACTIVE; |
| 420 | } else { |
| 421 | _debug("reuse"); |
| 422 | ASSERTCMP(sb->s_flags, &, MS_ACTIVE); |
Al Viro | dde194a | 2011-06-12 16:01:21 -0400 | [diff] [blame] | 423 | afs_put_volume(vol); |
| 424 | kfree(as); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 426 | |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 427 | afs_put_cell(params.cell); |
Al Viro | 2a32ceb | 2009-05-08 16:05:57 -0400 | [diff] [blame] | 428 | kfree(new_opts); |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 429 | _leave(" = 0 [%p]", sb); |
Al Viro | f7442b3 | 2010-07-26 14:16:21 +0400 | [diff] [blame] | 430 | return dget(sb->s_root); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 431 | |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 432 | error: |
David Howells | 00d3b7a | 2007-04-26 15:57:07 -0700 | [diff] [blame] | 433 | afs_put_cell(params.cell); |
| 434 | key_put(params.key); |
Miklos Szeredi | 969729d | 2008-02-08 04:21:37 -0800 | [diff] [blame] | 435 | kfree(new_opts); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | _leave(" = %d", ret); |
Al Viro | f7442b3 | 2010-07-26 14:16:21 +0400 | [diff] [blame] | 437 | return ERR_PTR(ret); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 438 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 439 | |
Al Viro | dde194a | 2011-06-12 16:01:21 -0400 | [diff] [blame] | 440 | static void afs_kill_super(struct super_block *sb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 441 | { |
| 442 | struct afs_super_info *as = sb->s_fs_info; |
Al Viro | dde194a | 2011-06-12 16:01:21 -0400 | [diff] [blame] | 443 | kill_anon_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 444 | afs_put_volume(as->volume); |
Al Viro | dde194a | 2011-06-12 16:01:21 -0400 | [diff] [blame] | 445 | kfree(as); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 446 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 447 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 448 | /* |
| 449 | * initialise an inode cache slab element prior to any use |
| 450 | */ |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 451 | static void afs_i_init_once(void *_vnode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 452 | { |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 453 | struct afs_vnode *vnode = _vnode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 454 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 455 | memset(vnode, 0, sizeof(*vnode)); |
| 456 | inode_init_once(&vnode->vfs_inode); |
| 457 | init_waitqueue_head(&vnode->update_waitq); |
| 458 | mutex_init(&vnode->permits_lock); |
| 459 | mutex_init(&vnode->validate_lock); |
| 460 | spin_lock_init(&vnode->writeback_lock); |
| 461 | spin_lock_init(&vnode->lock); |
| 462 | INIT_LIST_HEAD(&vnode->writebacks); |
David Howells | e8d6c55 | 2007-07-15 23:40:12 -0700 | [diff] [blame] | 463 | INIT_LIST_HEAD(&vnode->pending_locks); |
| 464 | INIT_LIST_HEAD(&vnode->granted_locks); |
| 465 | INIT_DELAYED_WORK(&vnode->lock_work, afs_lock_work); |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 466 | INIT_WORK(&vnode->cb_broken_work, afs_broken_callback_work); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 467 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 468 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 469 | /* |
| 470 | * allocate an AFS inode struct from our slab cache |
| 471 | */ |
| 472 | static struct inode *afs_alloc_inode(struct super_block *sb) |
| 473 | { |
| 474 | struct afs_vnode *vnode; |
| 475 | |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 476 | vnode = kmem_cache_alloc(afs_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 477 | if (!vnode) |
| 478 | return NULL; |
| 479 | |
| 480 | atomic_inc(&afs_count_active_inodes); |
| 481 | |
| 482 | memset(&vnode->fid, 0, sizeof(vnode->fid)); |
| 483 | memset(&vnode->status, 0, sizeof(vnode->status)); |
| 484 | |
| 485 | vnode->volume = NULL; |
| 486 | vnode->update_cnt = 0; |
David Howells | 260a980 | 2007-04-26 15:59:35 -0700 | [diff] [blame] | 487 | vnode->flags = 1 << AFS_VNODE_UNSET; |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 488 | vnode->cb_promised = false; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 489 | |
David Howells | 0f300ca | 2007-05-10 22:22:20 -0700 | [diff] [blame] | 490 | _leave(" = %p", &vnode->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 491 | return &vnode->vfs_inode; |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 492 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 493 | |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 494 | static void afs_i_callback(struct rcu_head *head) |
| 495 | { |
| 496 | struct inode *inode = container_of(head, struct inode, i_rcu); |
| 497 | struct afs_vnode *vnode = AFS_FS_I(inode); |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 498 | kmem_cache_free(afs_inode_cachep, vnode); |
| 499 | } |
| 500 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 501 | /* |
| 502 | * destroy an AFS inode struct |
| 503 | */ |
| 504 | static void afs_destroy_inode(struct inode *inode) |
| 505 | { |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 506 | struct afs_vnode *vnode = AFS_FS_I(inode); |
| 507 | |
David Howells | 0f300ca | 2007-05-10 22:22:20 -0700 | [diff] [blame] | 508 | _enter("%p{%x:%u}", inode, vnode->fid.vid, vnode->fid.vnode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 509 | |
David Howells | 08e0e7c | 2007-04-26 15:55:03 -0700 | [diff] [blame] | 510 | _debug("DESTROY INODE %p", inode); |
| 511 | |
| 512 | ASSERTCMP(vnode->server, ==, NULL); |
| 513 | |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 514 | call_rcu(&inode->i_rcu, afs_i_callback); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 515 | atomic_dec(&afs_count_active_inodes); |
David Howells | ec26815 | 2007-04-26 15:49:28 -0700 | [diff] [blame] | 516 | } |
David Howells | 45222b9 | 2007-05-10 22:22:20 -0700 | [diff] [blame] | 517 | |
| 518 | /* |
| 519 | * return information about an AFS volume |
| 520 | */ |
| 521 | static int afs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 522 | { |
| 523 | struct afs_volume_status vs; |
| 524 | struct afs_vnode *vnode = AFS_FS_I(dentry->d_inode); |
| 525 | struct key *key; |
| 526 | int ret; |
| 527 | |
| 528 | key = afs_request_key(vnode->volume->cell); |
| 529 | if (IS_ERR(key)) |
| 530 | return PTR_ERR(key); |
| 531 | |
| 532 | ret = afs_vnode_get_volume_status(vnode, key, &vs); |
| 533 | key_put(key); |
| 534 | if (ret < 0) { |
| 535 | _leave(" = %d", ret); |
| 536 | return ret; |
| 537 | } |
| 538 | |
| 539 | buf->f_type = dentry->d_sb->s_magic; |
| 540 | buf->f_bsize = AFS_BLOCK_SIZE; |
| 541 | buf->f_namelen = AFSNAMEMAX - 1; |
| 542 | |
| 543 | if (vs.max_quota == 0) |
| 544 | buf->f_blocks = vs.part_max_blocks; |
| 545 | else |
| 546 | buf->f_blocks = vs.max_quota; |
| 547 | buf->f_bavail = buf->f_bfree = buf->f_blocks - vs.blocks_in_use; |
| 548 | return 0; |
| 549 | } |