Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) 2005, 2006 |
Boaz Harrosh | 27d2e14 | 2009-06-14 17:23:09 +0300 | [diff] [blame] | 3 | * Avishay Traeger (avishay@gmail.com) |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 4 | * Copyright (C) 2008, 2009 |
| 5 | * Boaz Harrosh <bharrosh@panasas.com> |
| 6 | * |
| 7 | * Copyrights for code taken from ext2: |
| 8 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 9 | * Remy Card (card@masi.ibp.fr) |
| 10 | * Laboratoire MASI - Institut Blaise Pascal |
| 11 | * Universite Pierre et Marie Curie (Paris VI) |
| 12 | * from |
| 13 | * linux/fs/minix/inode.c |
| 14 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 15 | * |
| 16 | * This file is part of exofs. |
| 17 | * |
| 18 | * exofs is free software; you can redistribute it and/or modify |
| 19 | * it under the terms of the GNU General Public License as published by |
| 20 | * the Free Software Foundation. Since it is based on ext2, and the only |
| 21 | * valid version of GPL for the Linux kernel is version 2, the only valid |
| 22 | * version of GPL for exofs is version 2. |
| 23 | * |
| 24 | * exofs is distributed in the hope that it will be useful, |
| 25 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 26 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 27 | * GNU General Public License for more details. |
| 28 | * |
| 29 | * You should have received a copy of the GNU General Public License |
| 30 | * along with exofs; if not, write to the Free Software |
| 31 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
| 32 | */ |
| 33 | |
| 34 | #include <linux/string.h> |
| 35 | #include <linux/parser.h> |
| 36 | #include <linux/vfs.h> |
| 37 | #include <linux/random.h> |
Paul Gortmaker | 143cb49 | 2011-07-01 14:23:34 -0400 | [diff] [blame] | 38 | #include <linux/module.h> |
Boaz Harrosh | 8cf74b3 | 2009-03-22 12:47:26 +0200 | [diff] [blame] | 39 | #include <linux/exportfs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 40 | #include <linux/slab.h> |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 41 | |
| 42 | #include "exofs.h" |
| 43 | |
Boaz Harrosh | 85e44df | 2011-05-16 15:26:47 +0300 | [diff] [blame] | 44 | #define EXOFS_DBGMSG2(M...) do {} while (0) |
| 45 | |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 46 | /****************************************************************************** |
| 47 | * MOUNT OPTIONS |
| 48 | *****************************************************************************/ |
| 49 | |
| 50 | /* |
| 51 | * struct to hold what we get from mount options |
| 52 | */ |
| 53 | struct exofs_mountopt { |
Boaz Harrosh | 9ed9648 | 2011-01-31 14:32:14 +0200 | [diff] [blame] | 54 | bool is_osdname; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 55 | const char *dev_name; |
| 56 | uint64_t pid; |
| 57 | int timeout; |
| 58 | }; |
| 59 | |
| 60 | /* |
| 61 | * exofs-specific mount-time options. |
| 62 | */ |
Boaz Harrosh | 9ed9648 | 2011-01-31 14:32:14 +0200 | [diff] [blame] | 63 | enum { Opt_name, Opt_pid, Opt_to, Opt_err }; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 64 | |
| 65 | /* |
| 66 | * Our mount-time options. These should ideally be 64-bit unsigned, but the |
| 67 | * kernel's parsing functions do not currently support that. 32-bit should be |
| 68 | * sufficient for most applications now. |
| 69 | */ |
| 70 | static match_table_t tokens = { |
Boaz Harrosh | 9ed9648 | 2011-01-31 14:32:14 +0200 | [diff] [blame] | 71 | {Opt_name, "osdname=%s"}, |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 72 | {Opt_pid, "pid=%u"}, |
| 73 | {Opt_to, "to=%u"}, |
| 74 | {Opt_err, NULL} |
| 75 | }; |
| 76 | |
| 77 | /* |
| 78 | * The main option parsing method. Also makes sure that all of the mandatory |
| 79 | * mount options were set. |
| 80 | */ |
| 81 | static int parse_options(char *options, struct exofs_mountopt *opts) |
| 82 | { |
| 83 | char *p; |
| 84 | substring_t args[MAX_OPT_ARGS]; |
| 85 | int option; |
| 86 | bool s_pid = false; |
| 87 | |
| 88 | EXOFS_DBGMSG("parse_options %s\n", options); |
| 89 | /* defaults */ |
| 90 | memset(opts, 0, sizeof(*opts)); |
| 91 | opts->timeout = BLK_DEFAULT_SG_TIMEOUT; |
| 92 | |
| 93 | while ((p = strsep(&options, ",")) != NULL) { |
| 94 | int token; |
| 95 | char str[32]; |
| 96 | |
| 97 | if (!*p) |
| 98 | continue; |
| 99 | |
| 100 | token = match_token(p, tokens, args); |
| 101 | switch (token) { |
Boaz Harrosh | 9ed9648 | 2011-01-31 14:32:14 +0200 | [diff] [blame] | 102 | case Opt_name: |
| 103 | opts->dev_name = match_strdup(&args[0]); |
| 104 | if (unlikely(!opts->dev_name)) { |
| 105 | EXOFS_ERR("Error allocating dev_name"); |
| 106 | return -ENOMEM; |
| 107 | } |
| 108 | opts->is_osdname = true; |
| 109 | break; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 110 | case Opt_pid: |
| 111 | if (0 == match_strlcpy(str, &args[0], sizeof(str))) |
| 112 | return -EINVAL; |
| 113 | opts->pid = simple_strtoull(str, NULL, 0); |
| 114 | if (opts->pid < EXOFS_MIN_PID) { |
| 115 | EXOFS_ERR("Partition ID must be >= %u", |
| 116 | EXOFS_MIN_PID); |
| 117 | return -EINVAL; |
| 118 | } |
| 119 | s_pid = 1; |
| 120 | break; |
| 121 | case Opt_to: |
| 122 | if (match_int(&args[0], &option)) |
| 123 | return -EINVAL; |
| 124 | if (option <= 0) { |
| 125 | EXOFS_ERR("Timout must be > 0"); |
| 126 | return -EINVAL; |
| 127 | } |
| 128 | opts->timeout = option * HZ; |
| 129 | break; |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | if (!s_pid) { |
| 134 | EXOFS_ERR("Need to specify the following options:\n"); |
| 135 | EXOFS_ERR(" -o pid=pid_no_to_use\n"); |
| 136 | return -EINVAL; |
| 137 | } |
| 138 | |
| 139 | return 0; |
| 140 | } |
| 141 | |
| 142 | /****************************************************************************** |
| 143 | * INODE CACHE |
| 144 | *****************************************************************************/ |
| 145 | |
| 146 | /* |
| 147 | * Our inode cache. Isn't it pretty? |
| 148 | */ |
| 149 | static struct kmem_cache *exofs_inode_cachep; |
| 150 | |
| 151 | /* |
| 152 | * Allocate an inode in the cache |
| 153 | */ |
| 154 | static struct inode *exofs_alloc_inode(struct super_block *sb) |
| 155 | { |
| 156 | struct exofs_i_info *oi; |
| 157 | |
| 158 | oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL); |
| 159 | if (!oi) |
| 160 | return NULL; |
| 161 | |
| 162 | oi->vfs_inode.i_version = 1; |
| 163 | return &oi->vfs_inode; |
| 164 | } |
| 165 | |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 166 | static void exofs_i_callback(struct rcu_head *head) |
| 167 | { |
| 168 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 169 | kmem_cache_free(exofs_inode_cachep, exofs_i(inode)); |
| 170 | } |
| 171 | |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 172 | /* |
| 173 | * Remove an inode from the cache |
| 174 | */ |
| 175 | static void exofs_destroy_inode(struct inode *inode) |
| 176 | { |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 177 | call_rcu(&inode->i_rcu, exofs_i_callback); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 178 | } |
| 179 | |
| 180 | /* |
| 181 | * Initialize the inode |
| 182 | */ |
| 183 | static void exofs_init_once(void *foo) |
| 184 | { |
| 185 | struct exofs_i_info *oi = foo; |
| 186 | |
| 187 | inode_init_once(&oi->vfs_inode); |
| 188 | } |
| 189 | |
| 190 | /* |
| 191 | * Create and initialize the inode cache |
| 192 | */ |
| 193 | static int init_inodecache(void) |
| 194 | { |
| 195 | exofs_inode_cachep = kmem_cache_create("exofs_inode_cache", |
| 196 | sizeof(struct exofs_i_info), 0, |
| 197 | SLAB_RECLAIM_ACCOUNT | SLAB_MEM_SPREAD, |
| 198 | exofs_init_once); |
| 199 | if (exofs_inode_cachep == NULL) |
| 200 | return -ENOMEM; |
| 201 | return 0; |
| 202 | } |
| 203 | |
| 204 | /* |
| 205 | * Destroy the inode cache |
| 206 | */ |
| 207 | static void destroy_inodecache(void) |
| 208 | { |
| 209 | kmem_cache_destroy(exofs_inode_cachep); |
| 210 | } |
| 211 | |
| 212 | /****************************************************************************** |
Boaz Harrosh | 85e44df | 2011-05-16 15:26:47 +0300 | [diff] [blame] | 213 | * Some osd helpers |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 214 | *****************************************************************************/ |
Boaz Harrosh | 85e44df | 2011-05-16 15:26:47 +0300 | [diff] [blame] | 215 | void exofs_make_credential(u8 cred_a[OSD_CAP_LEN], const struct osd_obj_id *obj) |
| 216 | { |
| 217 | osd_sec_init_nosec_doall_caps(cred_a, obj, false, true); |
| 218 | } |
| 219 | |
| 220 | static int exofs_read_kern(struct osd_dev *od, u8 *cred, struct osd_obj_id *obj, |
| 221 | u64 offset, void *p, unsigned length) |
| 222 | { |
| 223 | struct osd_request *or = osd_start_request(od, GFP_KERNEL); |
| 224 | /* struct osd_sense_info osi = {.key = 0};*/ |
| 225 | int ret; |
| 226 | |
| 227 | if (unlikely(!or)) { |
| 228 | EXOFS_DBGMSG("%s: osd_start_request failed.\n", __func__); |
| 229 | return -ENOMEM; |
| 230 | } |
| 231 | ret = osd_req_read_kern(or, obj, offset, p, length); |
| 232 | if (unlikely(ret)) { |
| 233 | EXOFS_DBGMSG("%s: osd_req_read_kern failed.\n", __func__); |
| 234 | goto out; |
| 235 | } |
| 236 | |
| 237 | ret = osd_finalize_request(or, 0, cred, NULL); |
| 238 | if (unlikely(ret)) { |
| 239 | EXOFS_DBGMSG("Failed to osd_finalize_request() => %d\n", ret); |
| 240 | goto out; |
| 241 | } |
| 242 | |
| 243 | ret = osd_execute_request(or); |
| 244 | if (unlikely(ret)) |
| 245 | EXOFS_DBGMSG("osd_execute_request() => %d\n", ret); |
| 246 | /* osd_req_decode_sense(or, ret); */ |
| 247 | |
| 248 | out: |
| 249 | osd_end_request(or); |
| 250 | EXOFS_DBGMSG2("read_kern(0x%llx) offset=0x%llx " |
| 251 | "length=0x%llx dev=%p ret=>%d\n", |
| 252 | _LLU(obj->id), _LLU(offset), _LLU(length), od, ret); |
| 253 | return ret; |
| 254 | } |
| 255 | |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 256 | static const struct osd_attr g_attr_sb_stats = ATTR_DEF( |
| 257 | EXOFS_APAGE_SB_DATA, |
| 258 | EXOFS_ATTR_SB_STATS, |
| 259 | sizeof(struct exofs_sb_stats)); |
| 260 | |
| 261 | static int __sbi_read_stats(struct exofs_sb_info *sbi) |
| 262 | { |
| 263 | struct osd_attr attrs[] = { |
| 264 | [0] = g_attr_sb_stats, |
| 265 | }; |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 266 | struct ore_io_state *ios; |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 267 | int ret; |
| 268 | |
Boaz Harrosh | 5bf696d | 2011-09-28 11:39:59 +0300 | [diff] [blame] | 269 | ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 270 | if (unlikely(ret)) { |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 271 | EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 272 | return ret; |
| 273 | } |
| 274 | |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 275 | ios->in_attr = attrs; |
| 276 | ios->in_attr_len = ARRAY_SIZE(attrs); |
| 277 | |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 278 | ret = ore_read(ios); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 279 | if (unlikely(ret)) { |
| 280 | EXOFS_ERR("Error reading super_block stats => %d\n", ret); |
| 281 | goto out; |
| 282 | } |
| 283 | |
| 284 | ret = extract_attr_from_ios(ios, &attrs[0]); |
| 285 | if (ret) { |
| 286 | EXOFS_ERR("%s: extract_attr of sb_stats failed\n", __func__); |
| 287 | goto out; |
| 288 | } |
| 289 | if (attrs[0].len) { |
| 290 | struct exofs_sb_stats *ess; |
| 291 | |
| 292 | if (unlikely(attrs[0].len != sizeof(*ess))) { |
| 293 | EXOFS_ERR("%s: Wrong version of exofs_sb_stats " |
| 294 | "size(%d) != expected(%zd)\n", |
| 295 | __func__, attrs[0].len, sizeof(*ess)); |
| 296 | goto out; |
| 297 | } |
| 298 | |
| 299 | ess = attrs[0].val_ptr; |
| 300 | sbi->s_nextid = le64_to_cpu(ess->s_nextid); |
| 301 | sbi->s_numfiles = le32_to_cpu(ess->s_numfiles); |
| 302 | } |
| 303 | |
| 304 | out: |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 305 | ore_put_io_state(ios); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 306 | return ret; |
| 307 | } |
| 308 | |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 309 | static void stats_done(struct ore_io_state *ios, void *p) |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 310 | { |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 311 | ore_put_io_state(ios); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 312 | /* Good thanks nothing to do anymore */ |
| 313 | } |
| 314 | |
| 315 | /* Asynchronously write the stats attribute */ |
| 316 | int exofs_sbi_write_stats(struct exofs_sb_info *sbi) |
| 317 | { |
| 318 | struct osd_attr attrs[] = { |
| 319 | [0] = g_attr_sb_stats, |
| 320 | }; |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 321 | struct ore_io_state *ios; |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 322 | int ret; |
| 323 | |
Boaz Harrosh | 5bf696d | 2011-09-28 11:39:59 +0300 | [diff] [blame] | 324 | ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 325 | if (unlikely(ret)) { |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 326 | EXOFS_ERR("%s: ore_get_io_state failed.\n", __func__); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 327 | return ret; |
| 328 | } |
| 329 | |
| 330 | sbi->s_ess.s_nextid = cpu_to_le64(sbi->s_nextid); |
| 331 | sbi->s_ess.s_numfiles = cpu_to_le64(sbi->s_numfiles); |
| 332 | attrs[0].val_ptr = &sbi->s_ess; |
| 333 | |
Boaz Harrosh | 9e9db45 | 2011-08-05 15:06:04 -0700 | [diff] [blame] | 334 | |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 335 | ios->done = stats_done; |
| 336 | ios->private = sbi; |
| 337 | ios->out_attr = attrs; |
| 338 | ios->out_attr_len = ARRAY_SIZE(attrs); |
| 339 | |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 340 | ret = ore_write(ios); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 341 | if (unlikely(ret)) { |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 342 | EXOFS_ERR("%s: ore_write failed.\n", __func__); |
| 343 | ore_put_io_state(ios); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 344 | } |
| 345 | |
| 346 | return ret; |
| 347 | } |
| 348 | |
Boaz Harrosh | 85e44df | 2011-05-16 15:26:47 +0300 | [diff] [blame] | 349 | /****************************************************************************** |
| 350 | * SUPERBLOCK FUNCTIONS |
| 351 | *****************************************************************************/ |
| 352 | static const struct super_operations exofs_sops; |
| 353 | static const struct export_operations exofs_export_ops; |
| 354 | |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 355 | /* |
| 356 | * Write the superblock to the OSD |
| 357 | */ |
H Hartley Sweeten | de74b05 | 2011-09-23 13:46:51 -0700 | [diff] [blame] | 358 | static int exofs_sync_fs(struct super_block *sb, int wait) |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 359 | { |
| 360 | struct exofs_sb_info *sbi; |
| 361 | struct exofs_fscb *fscb; |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 362 | struct ore_comp one_comp; |
Boaz Harrosh | 5bf696d | 2011-09-28 11:39:59 +0300 | [diff] [blame] | 363 | struct ore_components oc; |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 364 | struct ore_io_state *ios; |
Christoph Hellwig | 80e09fb | 2009-06-08 10:03:58 +0200 | [diff] [blame] | 365 | int ret = -ENOMEM; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 366 | |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 367 | fscb = kmalloc(sizeof(*fscb), GFP_KERNEL); |
| 368 | if (unlikely(!fscb)) |
| 369 | return -ENOMEM; |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 370 | |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 371 | sbi = sb->s_fs_info; |
| 372 | |
| 373 | /* NOTE: We no longer dirty the super_block anywhere in exofs. The |
| 374 | * reason we write the fscb here on unmount is so we can stay backwards |
| 375 | * compatible with fscb->s_version == 1. (What we are not compatible |
| 376 | * with is if a new version FS crashed and then we try to mount an old |
| 377 | * version). Otherwise the exofs_fscb is read-only from mkfs time. All |
| 378 | * the writeable info is set in exofs_sbi_write_stats() above. |
| 379 | */ |
Boaz Harrosh | 9e9db45 | 2011-08-05 15:06:04 -0700 | [diff] [blame] | 380 | |
Boaz Harrosh | 5bf696d | 2011-09-28 11:39:59 +0300 | [diff] [blame] | 381 | exofs_init_comps(&oc, &one_comp, sbi, EXOFS_SUPER_ID); |
Boaz Harrosh | 9e9db45 | 2011-08-05 15:06:04 -0700 | [diff] [blame] | 382 | |
Boaz Harrosh | 5bf696d | 2011-09-28 11:39:59 +0300 | [diff] [blame] | 383 | ret = ore_get_io_state(&sbi->layout, &oc, &ios); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 384 | if (unlikely(ret)) |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 385 | goto out; |
| 386 | |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 387 | lock_super(sb); |
| 388 | |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 389 | ios->length = offsetof(struct exofs_fscb, s_dev_table_oid); |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 390 | memset(fscb, 0, ios->length); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 391 | fscb->s_nextid = cpu_to_le64(sbi->s_nextid); |
Dan Carpenter | b6d1f2d | 2011-11-21 17:43:11 +0300 | [diff] [blame] | 392 | fscb->s_numfiles = cpu_to_le64(sbi->s_numfiles); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 393 | fscb->s_magic = cpu_to_le16(sb->s_magic); |
| 394 | fscb->s_newfs = 0; |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 395 | fscb->s_version = EXOFS_FSCB_VER; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 396 | |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 397 | ios->offset = 0; |
| 398 | ios->kern_buff = fscb; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 399 | |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 400 | ret = ore_write(ios); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 401 | if (unlikely(ret)) |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 402 | EXOFS_ERR("%s: ore_write failed.\n", __func__); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 403 | else |
| 404 | sb->s_dirt = 0; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 405 | |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 406 | |
| 407 | unlock_super(sb); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 408 | out: |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 409 | EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret); |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 410 | ore_put_io_state(ios); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 411 | kfree(fscb); |
Christoph Hellwig | 80e09fb | 2009-06-08 10:03:58 +0200 | [diff] [blame] | 412 | return ret; |
| 413 | } |
| 414 | |
| 415 | static void exofs_write_super(struct super_block *sb) |
| 416 | { |
| 417 | if (!(sb->s_flags & MS_RDONLY)) |
| 418 | exofs_sync_fs(sb, 1); |
| 419 | else |
| 420 | sb->s_dirt = 0; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 421 | } |
| 422 | |
Boaz Harrosh | 19fe294 | 2009-09-03 20:38:02 +0300 | [diff] [blame] | 423 | static void _exofs_print_device(const char *msg, const char *dev_path, |
| 424 | struct osd_dev *od, u64 pid) |
| 425 | { |
| 426 | const struct osd_dev_info *odi = osduld_device_info(od); |
| 427 | |
| 428 | printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n", |
| 429 | msg, dev_path ?: "", odi->osdname, _LLU(pid)); |
| 430 | } |
| 431 | |
H Hartley Sweeten | de74b05 | 2011-09-23 13:46:51 -0700 | [diff] [blame] | 432 | static void exofs_free_sbi(struct exofs_sb_info *sbi) |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 433 | { |
Boaz Harrosh | d866d87 | 2011-09-28 14:43:09 +0300 | [diff] [blame] | 434 | unsigned numdevs = sbi->oc.numdevs; |
| 435 | |
| 436 | while (numdevs) { |
| 437 | unsigned i = --numdevs; |
| 438 | struct osd_dev *od = ore_comp_dev(&sbi->oc, i); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 439 | |
| 440 | if (od) { |
Boaz Harrosh | d866d87 | 2011-09-28 14:43:09 +0300 | [diff] [blame] | 441 | ore_comp_set_dev(&sbi->oc, i, NULL); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 442 | osduld_put_device(od); |
| 443 | } |
| 444 | } |
Boaz Harrosh | d866d87 | 2011-09-28 14:43:09 +0300 | [diff] [blame] | 445 | kfree(sbi->oc.ods); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 446 | kfree(sbi); |
| 447 | } |
| 448 | |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 449 | /* |
| 450 | * This function is called when the vfs is freeing the superblock. We just |
| 451 | * need to free our own part. |
| 452 | */ |
| 453 | static void exofs_put_super(struct super_block *sb) |
| 454 | { |
| 455 | int num_pend; |
| 456 | struct exofs_sb_info *sbi = sb->s_fs_info; |
| 457 | |
| 458 | /* make sure there are no pending commands */ |
| 459 | for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0; |
| 460 | num_pend = atomic_read(&sbi->s_curr_pending)) { |
| 461 | wait_queue_head_t wq; |
Boaz Harrosh | a49fb4c | 2011-02-07 18:12:15 +0200 | [diff] [blame] | 462 | |
| 463 | printk(KERN_NOTICE "%s: !!Pending operations in flight. " |
| 464 | "This is a BUG. please report to osd-dev@open-osd.org\n", |
| 465 | __func__); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 466 | init_waitqueue_head(&wq); |
| 467 | wait_event_timeout(wq, |
| 468 | (atomic_read(&sbi->s_curr_pending) == 0), |
| 469 | msecs_to_jiffies(100)); |
| 470 | } |
| 471 | |
Boaz Harrosh | d866d87 | 2011-09-28 14:43:09 +0300 | [diff] [blame] | 472 | _exofs_print_device("Unmounting", NULL, ore_comp_dev(&sbi->oc, 0), |
Boaz Harrosh | 9e9db45 | 2011-08-05 15:06:04 -0700 | [diff] [blame] | 473 | sbi->one_comp.obj.partition); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 474 | |
Jens Axboe | b3d0ab7 | 2010-04-22 12:26:04 +0200 | [diff] [blame] | 475 | bdi_destroy(&sbi->bdi); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 476 | exofs_free_sbi(sbi); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 477 | sb->s_fs_info = NULL; |
| 478 | } |
| 479 | |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 480 | static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs, |
| 481 | struct exofs_device_table *dt) |
| 482 | { |
Boaz Harrosh | 5a51c0c | 2011-09-28 13:18:45 +0300 | [diff] [blame] | 483 | int ret; |
Boaz Harrosh | 5d952b8 | 2010-02-01 13:35:51 +0200 | [diff] [blame] | 484 | |
Boaz Harrosh | 8d2d83a | 2011-08-10 14:15:02 -0700 | [diff] [blame] | 485 | sbi->layout.stripe_unit = |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 486 | le64_to_cpu(dt->dt_data_map.cb_stripe_unit); |
Boaz Harrosh | 8d2d83a | 2011-08-10 14:15:02 -0700 | [diff] [blame] | 487 | sbi->layout.group_width = |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 488 | le32_to_cpu(dt->dt_data_map.cb_group_width); |
Boaz Harrosh | 8d2d83a | 2011-08-10 14:15:02 -0700 | [diff] [blame] | 489 | sbi->layout.group_depth = |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 490 | le32_to_cpu(dt->dt_data_map.cb_group_depth); |
Boaz Harrosh | 8d2d83a | 2011-08-10 14:15:02 -0700 | [diff] [blame] | 491 | sbi->layout.mirrors_p1 = |
| 492 | le32_to_cpu(dt->dt_data_map.cb_mirror_cnt) + 1; |
| 493 | sbi->layout.raid_algorithm = |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 494 | le32_to_cpu(dt->dt_data_map.cb_raid_algorithm); |
| 495 | |
Boaz Harrosh | 5a51c0c | 2011-09-28 13:18:45 +0300 | [diff] [blame] | 496 | ret = ore_verify_layout(numdevs, &sbi->layout); |
Boaz Harrosh | 5d952b8 | 2010-02-01 13:35:51 +0200 | [diff] [blame] | 497 | |
Boaz Harrosh | 6d4073e | 2011-07-27 17:51:53 -0700 | [diff] [blame] | 498 | EXOFS_DBGMSG("exofs: layout: " |
| 499 | "num_comps=%u stripe_unit=0x%x group_width=%u " |
| 500 | "group_depth=0x%llx mirrors_p1=%u raid_algorithm=%u\n", |
| 501 | numdevs, |
| 502 | sbi->layout.stripe_unit, |
| 503 | sbi->layout.group_width, |
| 504 | _LLU(sbi->layout.group_depth), |
| 505 | sbi->layout.mirrors_p1, |
Boaz Harrosh | 8d2d83a | 2011-08-10 14:15:02 -0700 | [diff] [blame] | 506 | sbi->layout.raid_algorithm); |
Boaz Harrosh | 5a51c0c | 2011-09-28 13:18:45 +0300 | [diff] [blame] | 507 | return ret; |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 508 | } |
| 509 | |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 510 | static unsigned __ra_pages(struct ore_layout *layout) |
bharrosh@panasas.com | 66cd6ca | 2010-10-07 14:28:18 -0400 | [diff] [blame] | 511 | { |
| 512 | const unsigned _MIN_RA = 32; /* min 128K read-ahead */ |
| 513 | unsigned ra_pages = layout->group_width * layout->stripe_unit / |
| 514 | PAGE_SIZE; |
| 515 | unsigned max_io_pages = exofs_max_io_pages(layout, ~0); |
| 516 | |
| 517 | ra_pages *= 2; /* two stripes */ |
| 518 | if (ra_pages < _MIN_RA) |
| 519 | ra_pages = roundup(_MIN_RA, ra_pages / 2); |
| 520 | |
| 521 | if (ra_pages > max_io_pages) |
| 522 | ra_pages = max_io_pages; |
| 523 | |
| 524 | return ra_pages; |
| 525 | } |
| 526 | |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 527 | /* @odi is valid only as long as @fscb_dev is valid */ |
| 528 | static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev, |
| 529 | struct osd_dev_info *odi) |
| 530 | { |
| 531 | odi->systemid_len = le32_to_cpu(dt_dev->systemid_len); |
| 532 | memcpy(odi->systemid, dt_dev->systemid, odi->systemid_len); |
| 533 | |
| 534 | odi->osdname_len = le32_to_cpu(dt_dev->osdname_len); |
| 535 | odi->osdname = dt_dev->osdname; |
| 536 | |
| 537 | /* FIXME support long names. Will need a _put function */ |
| 538 | if (dt_dev->long_name_offset) |
| 539 | return -EINVAL; |
| 540 | |
| 541 | /* Make sure osdname is printable! |
| 542 | * mkexofs should give us space for a null-terminator else the |
| 543 | * device-table is invalid. |
| 544 | */ |
| 545 | if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname))) |
| 546 | odi->osdname_len = sizeof(dt_dev->osdname) - 1; |
| 547 | dt_dev->osdname[odi->osdname_len] = 0; |
| 548 | |
| 549 | /* If it's all zeros something is bad we read past end-of-obj */ |
| 550 | return !(odi->systemid_len || odi->osdname_len); |
| 551 | } |
| 552 | |
Boaz Harrosh | d866d87 | 2011-09-28 14:43:09 +0300 | [diff] [blame] | 553 | int __alloc_dev_table(struct exofs_sb_info *sbi, unsigned numdevs, |
| 554 | struct exofs_dev **peds) |
| 555 | { |
| 556 | struct __alloc_ore_devs_and_exofs_devs { |
| 557 | /* Twice bigger table: See exofs_init_comps() and comment at |
| 558 | * exofs_read_lookup_dev_table() |
| 559 | */ |
| 560 | struct ore_dev *oreds[numdevs * 2 - 1]; |
| 561 | struct exofs_dev eds[numdevs]; |
| 562 | } *aoded; |
| 563 | struct exofs_dev *eds; |
| 564 | unsigned i; |
| 565 | |
| 566 | aoded = kzalloc(sizeof(*aoded), GFP_KERNEL); |
| 567 | if (unlikely(!aoded)) { |
Masanari Iida | 3e57638 | 2012-02-01 23:53:46 +0900 | [diff] [blame^] | 568 | EXOFS_ERR("ERROR: failed allocating Device array[%d]\n", |
Boaz Harrosh | d866d87 | 2011-09-28 14:43:09 +0300 | [diff] [blame] | 569 | numdevs); |
| 570 | return -ENOMEM; |
| 571 | } |
| 572 | |
| 573 | sbi->oc.ods = aoded->oreds; |
| 574 | *peds = eds = aoded->eds; |
| 575 | for (i = 0; i < numdevs; ++i) |
| 576 | aoded->oreds[i] = &eds[i].ored; |
| 577 | return 0; |
| 578 | } |
| 579 | |
Boaz Harrosh | 6d4073e | 2011-07-27 17:51:53 -0700 | [diff] [blame] | 580 | static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi, |
| 581 | struct osd_dev *fscb_od, |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 582 | unsigned table_count) |
| 583 | { |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 584 | struct ore_comp comp; |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 585 | struct exofs_device_table *dt; |
Boaz Harrosh | d866d87 | 2011-09-28 14:43:09 +0300 | [diff] [blame] | 586 | struct exofs_dev *eds; |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 587 | unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) + |
| 588 | sizeof(*dt); |
| 589 | unsigned numdevs, i; |
| 590 | int ret; |
| 591 | |
| 592 | dt = kmalloc(table_bytes, GFP_KERNEL); |
| 593 | if (unlikely(!dt)) { |
| 594 | EXOFS_ERR("ERROR: allocating %x bytes for device table\n", |
| 595 | table_bytes); |
| 596 | return -ENOMEM; |
| 597 | } |
| 598 | |
Boaz Harrosh | 5bf696d | 2011-09-28 11:39:59 +0300 | [diff] [blame] | 599 | sbi->oc.numdevs = 0; |
Boaz Harrosh | 9e9db45 | 2011-08-05 15:06:04 -0700 | [diff] [blame] | 600 | |
| 601 | comp.obj.partition = sbi->one_comp.obj.partition; |
| 602 | comp.obj.id = EXOFS_DEVTABLE_ID; |
| 603 | exofs_make_credential(comp.cred, &comp.obj); |
| 604 | |
| 605 | ret = exofs_read_kern(fscb_od, comp.cred, &comp.obj, 0, dt, |
| 606 | table_bytes); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 607 | if (unlikely(ret)) { |
| 608 | EXOFS_ERR("ERROR: reading device table\n"); |
| 609 | goto out; |
| 610 | } |
| 611 | |
| 612 | numdevs = le64_to_cpu(dt->dt_num_devices); |
| 613 | if (unlikely(!numdevs)) { |
| 614 | ret = -EINVAL; |
| 615 | goto out; |
| 616 | } |
| 617 | WARN_ON(table_count != numdevs); |
| 618 | |
| 619 | ret = _read_and_match_data_map(sbi, numdevs, dt); |
| 620 | if (unlikely(ret)) |
| 621 | goto out; |
| 622 | |
Boaz Harrosh | d866d87 | 2011-09-28 14:43:09 +0300 | [diff] [blame] | 623 | ret = __alloc_dev_table(sbi, numdevs, &eds); |
| 624 | if (unlikely(ret)) |
| 625 | goto out; |
| 626 | /* exofs round-robins the device table view according to inode |
| 627 | * number. We hold a: twice bigger table hence inodes can point |
| 628 | * to any device and have a sequential view of the table |
| 629 | * starting at this device. See exofs_init_comps() |
| 630 | */ |
| 631 | memcpy(&sbi->oc.ods[numdevs], &sbi->oc.ods[0], |
| 632 | (numdevs - 1) * sizeof(sbi->oc.ods[0])); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 633 | |
| 634 | for (i = 0; i < numdevs; i++) { |
| 635 | struct exofs_fscb fscb; |
| 636 | struct osd_dev_info odi; |
| 637 | struct osd_dev *od; |
| 638 | |
| 639 | if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) { |
| 640 | EXOFS_ERR("ERROR: Read all-zeros device entry\n"); |
| 641 | ret = -EINVAL; |
| 642 | goto out; |
| 643 | } |
| 644 | |
| 645 | printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n", |
| 646 | i, odi.osdname); |
| 647 | |
Boaz Harrosh | d866d87 | 2011-09-28 14:43:09 +0300 | [diff] [blame] | 648 | /* the exofs id is currently the table index */ |
| 649 | eds[i].did = i; |
| 650 | |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 651 | /* On all devices the device table is identical. The user can |
| 652 | * specify any one of the participating devices on the command |
| 653 | * line. We always keep them in device-table order. |
| 654 | */ |
| 655 | if (fscb_od && osduld_device_same(fscb_od, &odi)) { |
Boaz Harrosh | d866d87 | 2011-09-28 14:43:09 +0300 | [diff] [blame] | 656 | eds[i].ored.od = fscb_od; |
Boaz Harrosh | 5bf696d | 2011-09-28 11:39:59 +0300 | [diff] [blame] | 657 | ++sbi->oc.numdevs; |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 658 | fscb_od = NULL; |
| 659 | continue; |
| 660 | } |
| 661 | |
| 662 | od = osduld_info_lookup(&odi); |
Tobias Klauser | 2c722c9 | 2010-12-09 15:55:21 +0100 | [diff] [blame] | 663 | if (IS_ERR(od)) { |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 664 | ret = PTR_ERR(od); |
| 665 | EXOFS_ERR("ERROR: device requested is not found " |
| 666 | "osd_name-%s =>%d\n", odi.osdname, ret); |
| 667 | goto out; |
| 668 | } |
| 669 | |
Boaz Harrosh | d866d87 | 2011-09-28 14:43:09 +0300 | [diff] [blame] | 670 | eds[i].ored.od = od; |
Boaz Harrosh | 5bf696d | 2011-09-28 11:39:59 +0300 | [diff] [blame] | 671 | ++sbi->oc.numdevs; |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 672 | |
| 673 | /* Read the fscb of the other devices to make sure the FS |
| 674 | * partition is there. |
| 675 | */ |
Boaz Harrosh | 9e9db45 | 2011-08-05 15:06:04 -0700 | [diff] [blame] | 676 | ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 677 | sizeof(fscb)); |
| 678 | if (unlikely(ret)) { |
| 679 | EXOFS_ERR("ERROR: Malformed participating device " |
| 680 | "error reading fscb osd_name-%s\n", |
| 681 | odi.osdname); |
| 682 | goto out; |
| 683 | } |
| 684 | |
| 685 | /* TODO: verify other information is correct and FS-uuid |
| 686 | * matches. Benny what did you say about device table |
| 687 | * generation and old devices? |
| 688 | */ |
| 689 | } |
| 690 | |
| 691 | out: |
| 692 | kfree(dt); |
Boaz Harrosh | d866d87 | 2011-09-28 14:43:09 +0300 | [diff] [blame] | 693 | if (unlikely(fscb_od && !ret)) { |
Boaz Harrosh | 9e9db45 | 2011-08-05 15:06:04 -0700 | [diff] [blame] | 694 | EXOFS_ERR("ERROR: Bad device-table container device not present\n"); |
| 695 | osduld_put_device(fscb_od); |
| 696 | return -EINVAL; |
Boaz Harrosh | 9e9db45 | 2011-08-05 15:06:04 -0700 | [diff] [blame] | 697 | } |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 698 | return ret; |
| 699 | } |
| 700 | |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 701 | /* |
| 702 | * Read the superblock from the OSD and fill in the fields |
| 703 | */ |
| 704 | static int exofs_fill_super(struct super_block *sb, void *data, int silent) |
| 705 | { |
| 706 | struct inode *root; |
| 707 | struct exofs_mountopt *opts = data; |
| 708 | struct exofs_sb_info *sbi; /*extended info */ |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 709 | struct osd_dev *od; /* Master device */ |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 710 | struct exofs_fscb fscb; /*on-disk superblock info */ |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 711 | struct ore_comp comp; |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 712 | unsigned table_count; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 713 | int ret; |
| 714 | |
| 715 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
| 716 | if (!sbi) |
| 717 | return -ENOMEM; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 718 | |
| 719 | /* use mount options to fill superblock */ |
Boaz Harrosh | 9ed9648 | 2011-01-31 14:32:14 +0200 | [diff] [blame] | 720 | if (opts->is_osdname) { |
| 721 | struct osd_dev_info odi = {.systemid_len = 0}; |
| 722 | |
| 723 | odi.osdname_len = strlen(opts->dev_name); |
| 724 | odi.osdname = (u8 *)opts->dev_name; |
| 725 | od = osduld_info_lookup(&odi); |
Boaz Harrosh | 9ce7304 | 2011-08-03 20:18:01 -0700 | [diff] [blame] | 726 | kfree(opts->dev_name); |
| 727 | opts->dev_name = NULL; |
Boaz Harrosh | 9ed9648 | 2011-01-31 14:32:14 +0200 | [diff] [blame] | 728 | } else { |
| 729 | od = osduld_path_lookup(opts->dev_name); |
| 730 | } |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 731 | if (IS_ERR(od)) { |
Boaz Harrosh | 9ed9648 | 2011-01-31 14:32:14 +0200 | [diff] [blame] | 732 | ret = -EINVAL; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 733 | goto free_sbi; |
| 734 | } |
| 735 | |
Boaz Harrosh | 45d3abc | 2010-01-28 11:46:16 +0200 | [diff] [blame] | 736 | /* Default layout in case we do not have a device-table */ |
Boaz Harrosh | 5d952b8 | 2010-02-01 13:35:51 +0200 | [diff] [blame] | 737 | sbi->layout.stripe_unit = PAGE_SIZE; |
| 738 | sbi->layout.mirrors_p1 = 1; |
| 739 | sbi->layout.group_width = 1; |
Boaz Harrosh | 50a76fd | 2010-02-11 13:01:39 +0200 | [diff] [blame] | 740 | sbi->layout.group_depth = -1; |
| 741 | sbi->layout.group_count = 1; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 742 | sbi->s_timeout = opts->timeout; |
| 743 | |
Boaz Harrosh | 9e9db45 | 2011-08-05 15:06:04 -0700 | [diff] [blame] | 744 | sbi->one_comp.obj.partition = opts->pid; |
| 745 | sbi->one_comp.obj.id = 0; |
| 746 | exofs_make_credential(sbi->one_comp.cred, &sbi->one_comp.obj); |
Boaz Harrosh | 5bf696d | 2011-09-28 11:39:59 +0300 | [diff] [blame] | 747 | sbi->oc.numdevs = 1; |
| 748 | sbi->oc.single_comp = EC_SINGLE_COMP; |
| 749 | sbi->oc.comps = &sbi->one_comp; |
Boaz Harrosh | 9e9db45 | 2011-08-05 15:06:04 -0700 | [diff] [blame] | 750 | |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 751 | /* fill in some other data by hand */ |
| 752 | memset(sb->s_id, 0, sizeof(sb->s_id)); |
| 753 | strcpy(sb->s_id, "exofs"); |
| 754 | sb->s_blocksize = EXOFS_BLKSIZE; |
| 755 | sb->s_blocksize_bits = EXOFS_BLKSHIFT; |
| 756 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
| 757 | atomic_set(&sbi->s_curr_pending, 0); |
| 758 | sb->s_bdev = NULL; |
| 759 | sb->s_dev = 0; |
| 760 | |
Boaz Harrosh | 9e9db45 | 2011-08-05 15:06:04 -0700 | [diff] [blame] | 761 | comp.obj.partition = sbi->one_comp.obj.partition; |
| 762 | comp.obj.id = EXOFS_SUPER_ID; |
| 763 | exofs_make_credential(comp.cred, &comp.obj); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 764 | |
Boaz Harrosh | 9e9db45 | 2011-08-05 15:06:04 -0700 | [diff] [blame] | 765 | ret = exofs_read_kern(od, comp.cred, &comp.obj, 0, &fscb, sizeof(fscb)); |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 766 | if (unlikely(ret)) |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 767 | goto free_sbi; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 768 | |
| 769 | sb->s_magic = le16_to_cpu(fscb.s_magic); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 770 | /* NOTE: we read below to be backward compatible with old versions */ |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 771 | sbi->s_nextid = le64_to_cpu(fscb.s_nextid); |
| 772 | sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles); |
| 773 | |
| 774 | /* make sure what we read from the object store is correct */ |
| 775 | if (sb->s_magic != EXOFS_SUPER_MAGIC) { |
| 776 | if (!silent) |
| 777 | EXOFS_ERR("ERROR: Bad magic value\n"); |
| 778 | ret = -EINVAL; |
| 779 | goto free_sbi; |
| 780 | } |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 781 | if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) { |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 782 | EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n", |
| 783 | EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version)); |
| 784 | ret = -EINVAL; |
| 785 | goto free_sbi; |
| 786 | } |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 787 | |
| 788 | /* start generation numbers from a random point */ |
| 789 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); |
| 790 | spin_lock_init(&sbi->s_next_gen_lock); |
| 791 | |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 792 | table_count = le64_to_cpu(fscb.s_dev_table_count); |
| 793 | if (table_count) { |
Boaz Harrosh | 6d4073e | 2011-07-27 17:51:53 -0700 | [diff] [blame] | 794 | ret = exofs_read_lookup_dev_table(sbi, od, table_count); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 795 | if (unlikely(ret)) |
| 796 | goto free_sbi; |
Boaz Harrosh | 6d4073e | 2011-07-27 17:51:53 -0700 | [diff] [blame] | 797 | } else { |
Boaz Harrosh | d866d87 | 2011-09-28 14:43:09 +0300 | [diff] [blame] | 798 | struct exofs_dev *eds; |
| 799 | |
| 800 | ret = __alloc_dev_table(sbi, 1, &eds); |
| 801 | if (unlikely(ret)) |
| 802 | goto free_sbi; |
| 803 | |
| 804 | ore_comp_set_dev(&sbi->oc, 0, od); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 805 | } |
| 806 | |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 807 | __sbi_read_stats(sbi); |
| 808 | |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 809 | /* set up operation vectors */ |
bharrosh@panasas.com | 66cd6ca | 2010-10-07 14:28:18 -0400 | [diff] [blame] | 810 | sbi->bdi.ra_pages = __ra_pages(&sbi->layout); |
Jens Axboe | b3d0ab7 | 2010-04-22 12:26:04 +0200 | [diff] [blame] | 811 | sb->s_bdi = &sbi->bdi; |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 812 | sb->s_fs_info = sbi; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 813 | sb->s_op = &exofs_sops; |
Boaz Harrosh | 8cf74b3 | 2009-03-22 12:47:26 +0200 | [diff] [blame] | 814 | sb->s_export_op = &exofs_export_ops; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 815 | root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF); |
| 816 | if (IS_ERR(root)) { |
| 817 | EXOFS_ERR("ERROR: exofs_iget failed\n"); |
| 818 | ret = PTR_ERR(root); |
| 819 | goto free_sbi; |
| 820 | } |
| 821 | sb->s_root = d_alloc_root(root); |
| 822 | if (!sb->s_root) { |
| 823 | iput(root); |
| 824 | EXOFS_ERR("ERROR: get root inode failed\n"); |
| 825 | ret = -ENOMEM; |
| 826 | goto free_sbi; |
| 827 | } |
| 828 | |
| 829 | if (!S_ISDIR(root->i_mode)) { |
| 830 | dput(sb->s_root); |
| 831 | sb->s_root = NULL; |
| 832 | EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n", |
| 833 | root->i_mode); |
| 834 | ret = -EINVAL; |
| 835 | goto free_sbi; |
| 836 | } |
| 837 | |
Boaz Harrosh | 6d4073e | 2011-07-27 17:51:53 -0700 | [diff] [blame] | 838 | ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY); |
| 839 | if (ret) { |
| 840 | EXOFS_DBGMSG("Failed to bdi_setup_and_register\n"); |
Al Viro | da01636 | 2012-01-08 19:45:28 -0500 | [diff] [blame] | 841 | dput(sb->s_root); |
| 842 | sb->s_root = NULL; |
Boaz Harrosh | 6d4073e | 2011-07-27 17:51:53 -0700 | [diff] [blame] | 843 | goto free_sbi; |
| 844 | } |
| 845 | |
Boaz Harrosh | d866d87 | 2011-09-28 14:43:09 +0300 | [diff] [blame] | 846 | _exofs_print_device("Mounting", opts->dev_name, |
| 847 | ore_comp_dev(&sbi->oc, 0), |
Boaz Harrosh | 9e9db45 | 2011-08-05 15:06:04 -0700 | [diff] [blame] | 848 | sbi->one_comp.obj.partition); |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 849 | return 0; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 850 | |
| 851 | free_sbi: |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 852 | EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n", |
Boaz Harrosh | 9e9db45 | 2011-08-05 15:06:04 -0700 | [diff] [blame] | 853 | opts->dev_name, sbi->one_comp.obj.partition, ret); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 854 | exofs_free_sbi(sbi); |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 855 | return ret; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 856 | } |
| 857 | |
| 858 | /* |
| 859 | * Set up the superblock (calls exofs_fill_super eventually) |
| 860 | */ |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 861 | static struct dentry *exofs_mount(struct file_system_type *type, |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 862 | int flags, const char *dev_name, |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 863 | void *data) |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 864 | { |
| 865 | struct exofs_mountopt opts; |
| 866 | int ret; |
| 867 | |
| 868 | ret = parse_options(data, &opts); |
| 869 | if (ret) |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 870 | return ERR_PTR(ret); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 871 | |
Boaz Harrosh | 9ed9648 | 2011-01-31 14:32:14 +0200 | [diff] [blame] | 872 | if (!opts.dev_name) |
| 873 | opts.dev_name = dev_name; |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 874 | return mount_nodev(type, flags, &opts, exofs_fill_super); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 875 | } |
| 876 | |
| 877 | /* |
| 878 | * Return information about the file system state in the buffer. This is used |
| 879 | * by the 'df' command, for example. |
| 880 | */ |
| 881 | static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 882 | { |
| 883 | struct super_block *sb = dentry->d_sb; |
| 884 | struct exofs_sb_info *sbi = sb->s_fs_info; |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 885 | struct ore_io_state *ios; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 886 | struct osd_attr attrs[] = { |
| 887 | ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS, |
| 888 | OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)), |
| 889 | ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION, |
| 890 | OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)), |
| 891 | }; |
| 892 | uint64_t capacity = ULLONG_MAX; |
| 893 | uint64_t used = ULLONG_MAX; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 894 | int ret; |
| 895 | |
Boaz Harrosh | 5bf696d | 2011-09-28 11:39:59 +0300 | [diff] [blame] | 896 | ret = ore_get_io_state(&sbi->layout, &sbi->oc, &ios); |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 897 | if (ret) { |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 898 | EXOFS_DBGMSG("ore_get_io_state failed.\n"); |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 899 | return ret; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 900 | } |
| 901 | |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 902 | ios->in_attr = attrs; |
| 903 | ios->in_attr_len = ARRAY_SIZE(attrs); |
| 904 | |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 905 | ret = ore_read(ios); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 906 | if (unlikely(ret)) |
| 907 | goto out; |
| 908 | |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 909 | ret = extract_attr_from_ios(ios, &attrs[0]); |
Boaz Harrosh | cae012d | 2009-11-02 18:19:24 +0200 | [diff] [blame] | 910 | if (likely(!ret)) { |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 911 | capacity = get_unaligned_be64(attrs[0].val_ptr); |
Boaz Harrosh | cae012d | 2009-11-02 18:19:24 +0200 | [diff] [blame] | 912 | if (unlikely(!capacity)) |
| 913 | capacity = ULLONG_MAX; |
| 914 | } else |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 915 | EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n"); |
| 916 | |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 917 | ret = extract_attr_from_ios(ios, &attrs[1]); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 918 | if (likely(!ret)) |
| 919 | used = get_unaligned_be64(attrs[1].val_ptr); |
| 920 | else |
| 921 | EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n"); |
| 922 | |
| 923 | /* fill in the stats buffer */ |
| 924 | buf->f_type = EXOFS_SUPER_MAGIC; |
| 925 | buf->f_bsize = EXOFS_BLKSIZE; |
Boaz Harrosh | cae012d | 2009-11-02 18:19:24 +0200 | [diff] [blame] | 926 | buf->f_blocks = capacity >> 9; |
| 927 | buf->f_bfree = (capacity - used) >> 9; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 928 | buf->f_bavail = buf->f_bfree; |
| 929 | buf->f_files = sbi->s_numfiles; |
| 930 | buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles; |
| 931 | buf->f_namelen = EXOFS_NAME_LEN; |
| 932 | |
| 933 | out: |
Boaz Harrosh | 8ff660a | 2011-08-06 19:26:31 -0700 | [diff] [blame] | 934 | ore_put_io_state(ios); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 935 | return ret; |
| 936 | } |
| 937 | |
| 938 | static const struct super_operations exofs_sops = { |
| 939 | .alloc_inode = exofs_alloc_inode, |
| 940 | .destroy_inode = exofs_destroy_inode, |
| 941 | .write_inode = exofs_write_inode, |
Al Viro | 4ec70c9 | 2010-06-07 11:42:26 -0400 | [diff] [blame] | 942 | .evict_inode = exofs_evict_inode, |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 943 | .put_super = exofs_put_super, |
| 944 | .write_super = exofs_write_super, |
Christoph Hellwig | 80e09fb | 2009-06-08 10:03:58 +0200 | [diff] [blame] | 945 | .sync_fs = exofs_sync_fs, |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 946 | .statfs = exofs_statfs, |
| 947 | }; |
| 948 | |
| 949 | /****************************************************************************** |
Boaz Harrosh | 8cf74b3 | 2009-03-22 12:47:26 +0200 | [diff] [blame] | 950 | * EXPORT OPERATIONS |
| 951 | *****************************************************************************/ |
| 952 | |
H Hartley Sweeten | de74b05 | 2011-09-23 13:46:51 -0700 | [diff] [blame] | 953 | static struct dentry *exofs_get_parent(struct dentry *child) |
Boaz Harrosh | 8cf74b3 | 2009-03-22 12:47:26 +0200 | [diff] [blame] | 954 | { |
| 955 | unsigned long ino = exofs_parent_ino(child); |
| 956 | |
| 957 | if (!ino) |
Al Viro | a803b80 | 2011-07-08 20:56:55 -0400 | [diff] [blame] | 958 | return ERR_PTR(-ESTALE); |
Boaz Harrosh | 8cf74b3 | 2009-03-22 12:47:26 +0200 | [diff] [blame] | 959 | |
| 960 | return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino)); |
| 961 | } |
| 962 | |
| 963 | static struct inode *exofs_nfs_get_inode(struct super_block *sb, |
| 964 | u64 ino, u32 generation) |
| 965 | { |
| 966 | struct inode *inode; |
| 967 | |
| 968 | inode = exofs_iget(sb, ino); |
| 969 | if (IS_ERR(inode)) |
| 970 | return ERR_CAST(inode); |
| 971 | if (generation && inode->i_generation != generation) { |
| 972 | /* we didn't find the right inode.. */ |
| 973 | iput(inode); |
| 974 | return ERR_PTR(-ESTALE); |
| 975 | } |
| 976 | return inode; |
| 977 | } |
| 978 | |
| 979 | static struct dentry *exofs_fh_to_dentry(struct super_block *sb, |
| 980 | struct fid *fid, int fh_len, int fh_type) |
| 981 | { |
| 982 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
| 983 | exofs_nfs_get_inode); |
| 984 | } |
| 985 | |
| 986 | static struct dentry *exofs_fh_to_parent(struct super_block *sb, |
| 987 | struct fid *fid, int fh_len, int fh_type) |
| 988 | { |
| 989 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
| 990 | exofs_nfs_get_inode); |
| 991 | } |
| 992 | |
| 993 | static const struct export_operations exofs_export_ops = { |
| 994 | .fh_to_dentry = exofs_fh_to_dentry, |
| 995 | .fh_to_parent = exofs_fh_to_parent, |
| 996 | .get_parent = exofs_get_parent, |
| 997 | }; |
| 998 | |
| 999 | /****************************************************************************** |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 1000 | * INSMOD/RMMOD |
| 1001 | *****************************************************************************/ |
| 1002 | |
| 1003 | /* |
| 1004 | * struct that describes this file system |
| 1005 | */ |
| 1006 | static struct file_system_type exofs_type = { |
| 1007 | .owner = THIS_MODULE, |
| 1008 | .name = "exofs", |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 1009 | .mount = exofs_mount, |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 1010 | .kill_sb = generic_shutdown_super, |
| 1011 | }; |
| 1012 | |
| 1013 | static int __init init_exofs(void) |
| 1014 | { |
| 1015 | int err; |
| 1016 | |
| 1017 | err = init_inodecache(); |
| 1018 | if (err) |
| 1019 | goto out; |
| 1020 | |
| 1021 | err = register_filesystem(&exofs_type); |
| 1022 | if (err) |
| 1023 | goto out_d; |
| 1024 | |
| 1025 | return 0; |
| 1026 | out_d: |
| 1027 | destroy_inodecache(); |
| 1028 | out: |
| 1029 | return err; |
| 1030 | } |
| 1031 | |
| 1032 | static void __exit exit_exofs(void) |
| 1033 | { |
| 1034 | unregister_filesystem(&exofs_type); |
| 1035 | destroy_inodecache(); |
| 1036 | } |
| 1037 | |
| 1038 | MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>"); |
| 1039 | MODULE_DESCRIPTION("exofs"); |
| 1040 | MODULE_LICENSE("GPL"); |
| 1041 | |
| 1042 | module_init(init_exofs) |
| 1043 | module_exit(exit_exofs) |