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> |
Boaz Harrosh | 8cf74b3 | 2009-03-22 12:47:26 +0200 | [diff] [blame] | 38 | #include <linux/exportfs.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 39 | #include <linux/slab.h> |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 40 | |
| 41 | #include "exofs.h" |
| 42 | |
Boaz Harrosh | 85e44df | 2011-05-16 15:26:47 +0300 | [diff] [blame^] | 43 | #define EXOFS_DBGMSG2(M...) do {} while (0) |
| 44 | |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 45 | /****************************************************************************** |
| 46 | * MOUNT OPTIONS |
| 47 | *****************************************************************************/ |
| 48 | |
| 49 | /* |
| 50 | * struct to hold what we get from mount options |
| 51 | */ |
| 52 | struct exofs_mountopt { |
Boaz Harrosh | 9ed9648 | 2011-01-31 14:32:14 +0200 | [diff] [blame] | 53 | bool is_osdname; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 54 | const char *dev_name; |
| 55 | uint64_t pid; |
| 56 | int timeout; |
| 57 | }; |
| 58 | |
| 59 | /* |
| 60 | * exofs-specific mount-time options. |
| 61 | */ |
Boaz Harrosh | 9ed9648 | 2011-01-31 14:32:14 +0200 | [diff] [blame] | 62 | enum { Opt_name, Opt_pid, Opt_to, Opt_err }; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 63 | |
| 64 | /* |
| 65 | * Our mount-time options. These should ideally be 64-bit unsigned, but the |
| 66 | * kernel's parsing functions do not currently support that. 32-bit should be |
| 67 | * sufficient for most applications now. |
| 68 | */ |
| 69 | static match_table_t tokens = { |
Boaz Harrosh | 9ed9648 | 2011-01-31 14:32:14 +0200 | [diff] [blame] | 70 | {Opt_name, "osdname=%s"}, |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 71 | {Opt_pid, "pid=%u"}, |
| 72 | {Opt_to, "to=%u"}, |
| 73 | {Opt_err, NULL} |
| 74 | }; |
| 75 | |
| 76 | /* |
| 77 | * The main option parsing method. Also makes sure that all of the mandatory |
| 78 | * mount options were set. |
| 79 | */ |
| 80 | static int parse_options(char *options, struct exofs_mountopt *opts) |
| 81 | { |
| 82 | char *p; |
| 83 | substring_t args[MAX_OPT_ARGS]; |
| 84 | int option; |
| 85 | bool s_pid = false; |
| 86 | |
| 87 | EXOFS_DBGMSG("parse_options %s\n", options); |
| 88 | /* defaults */ |
| 89 | memset(opts, 0, sizeof(*opts)); |
| 90 | opts->timeout = BLK_DEFAULT_SG_TIMEOUT; |
| 91 | |
| 92 | while ((p = strsep(&options, ",")) != NULL) { |
| 93 | int token; |
| 94 | char str[32]; |
| 95 | |
| 96 | if (!*p) |
| 97 | continue; |
| 98 | |
| 99 | token = match_token(p, tokens, args); |
| 100 | switch (token) { |
Boaz Harrosh | 9ed9648 | 2011-01-31 14:32:14 +0200 | [diff] [blame] | 101 | case Opt_name: |
| 102 | opts->dev_name = match_strdup(&args[0]); |
| 103 | if (unlikely(!opts->dev_name)) { |
| 104 | EXOFS_ERR("Error allocating dev_name"); |
| 105 | return -ENOMEM; |
| 106 | } |
| 107 | opts->is_osdname = true; |
| 108 | break; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 109 | case Opt_pid: |
| 110 | if (0 == match_strlcpy(str, &args[0], sizeof(str))) |
| 111 | return -EINVAL; |
| 112 | opts->pid = simple_strtoull(str, NULL, 0); |
| 113 | if (opts->pid < EXOFS_MIN_PID) { |
| 114 | EXOFS_ERR("Partition ID must be >= %u", |
| 115 | EXOFS_MIN_PID); |
| 116 | return -EINVAL; |
| 117 | } |
| 118 | s_pid = 1; |
| 119 | break; |
| 120 | case Opt_to: |
| 121 | if (match_int(&args[0], &option)) |
| 122 | return -EINVAL; |
| 123 | if (option <= 0) { |
| 124 | EXOFS_ERR("Timout must be > 0"); |
| 125 | return -EINVAL; |
| 126 | } |
| 127 | opts->timeout = option * HZ; |
| 128 | break; |
| 129 | } |
| 130 | } |
| 131 | |
| 132 | if (!s_pid) { |
| 133 | EXOFS_ERR("Need to specify the following options:\n"); |
| 134 | EXOFS_ERR(" -o pid=pid_no_to_use\n"); |
| 135 | return -EINVAL; |
| 136 | } |
| 137 | |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | /****************************************************************************** |
| 142 | * INODE CACHE |
| 143 | *****************************************************************************/ |
| 144 | |
| 145 | /* |
| 146 | * Our inode cache. Isn't it pretty? |
| 147 | */ |
| 148 | static struct kmem_cache *exofs_inode_cachep; |
| 149 | |
| 150 | /* |
| 151 | * Allocate an inode in the cache |
| 152 | */ |
| 153 | static struct inode *exofs_alloc_inode(struct super_block *sb) |
| 154 | { |
| 155 | struct exofs_i_info *oi; |
| 156 | |
| 157 | oi = kmem_cache_alloc(exofs_inode_cachep, GFP_KERNEL); |
| 158 | if (!oi) |
| 159 | return NULL; |
| 160 | |
| 161 | oi->vfs_inode.i_version = 1; |
| 162 | return &oi->vfs_inode; |
| 163 | } |
| 164 | |
Nick Piggin | fa0d7e3d | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 165 | static void exofs_i_callback(struct rcu_head *head) |
| 166 | { |
| 167 | struct inode *inode = container_of(head, struct inode, i_rcu); |
| 168 | INIT_LIST_HEAD(&inode->i_dentry); |
| 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 | fa0d7e3d | 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 | |
| 256 | unsigned exofs_layout_od_id(struct exofs_layout *layout, |
| 257 | osd_id obj_no, unsigned layout_index) |
| 258 | { |
| 259 | /* switch (layout->lay_func) { |
| 260 | case LAYOUT_MOVING_WINDOW: |
| 261 | {*/ |
| 262 | unsigned dev_mod = obj_no; |
| 263 | |
| 264 | return (layout_index + dev_mod * layout->mirrors_p1) % |
| 265 | layout->s_numdevs; |
| 266 | /* } |
| 267 | case LAYOUT_FUNC_IMPLICT: |
| 268 | return layout->devs[layout_index]; |
| 269 | }*/ |
| 270 | } |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 271 | |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 272 | static const struct osd_attr g_attr_sb_stats = ATTR_DEF( |
| 273 | EXOFS_APAGE_SB_DATA, |
| 274 | EXOFS_ATTR_SB_STATS, |
| 275 | sizeof(struct exofs_sb_stats)); |
| 276 | |
| 277 | static int __sbi_read_stats(struct exofs_sb_info *sbi) |
| 278 | { |
| 279 | struct osd_attr attrs[] = { |
| 280 | [0] = g_attr_sb_stats, |
| 281 | }; |
| 282 | struct exofs_io_state *ios; |
| 283 | int ret; |
| 284 | |
| 285 | ret = exofs_get_io_state(&sbi->layout, &ios); |
| 286 | if (unlikely(ret)) { |
| 287 | EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__); |
| 288 | return ret; |
| 289 | } |
| 290 | |
| 291 | ios->cred = sbi->s_cred; |
| 292 | |
| 293 | ios->in_attr = attrs; |
| 294 | ios->in_attr_len = ARRAY_SIZE(attrs); |
| 295 | |
| 296 | ret = exofs_sbi_read(ios); |
| 297 | if (unlikely(ret)) { |
| 298 | EXOFS_ERR("Error reading super_block stats => %d\n", ret); |
| 299 | goto out; |
| 300 | } |
| 301 | |
| 302 | ret = extract_attr_from_ios(ios, &attrs[0]); |
| 303 | if (ret) { |
| 304 | EXOFS_ERR("%s: extract_attr of sb_stats failed\n", __func__); |
| 305 | goto out; |
| 306 | } |
| 307 | if (attrs[0].len) { |
| 308 | struct exofs_sb_stats *ess; |
| 309 | |
| 310 | if (unlikely(attrs[0].len != sizeof(*ess))) { |
| 311 | EXOFS_ERR("%s: Wrong version of exofs_sb_stats " |
| 312 | "size(%d) != expected(%zd)\n", |
| 313 | __func__, attrs[0].len, sizeof(*ess)); |
| 314 | goto out; |
| 315 | } |
| 316 | |
| 317 | ess = attrs[0].val_ptr; |
| 318 | sbi->s_nextid = le64_to_cpu(ess->s_nextid); |
| 319 | sbi->s_numfiles = le32_to_cpu(ess->s_numfiles); |
| 320 | } |
| 321 | |
| 322 | out: |
| 323 | exofs_put_io_state(ios); |
| 324 | return ret; |
| 325 | } |
| 326 | |
| 327 | static void stats_done(struct exofs_io_state *ios, void *p) |
| 328 | { |
| 329 | exofs_put_io_state(ios); |
| 330 | /* Good thanks nothing to do anymore */ |
| 331 | } |
| 332 | |
| 333 | /* Asynchronously write the stats attribute */ |
| 334 | int exofs_sbi_write_stats(struct exofs_sb_info *sbi) |
| 335 | { |
| 336 | struct osd_attr attrs[] = { |
| 337 | [0] = g_attr_sb_stats, |
| 338 | }; |
| 339 | struct exofs_io_state *ios; |
| 340 | int ret; |
| 341 | |
| 342 | ret = exofs_get_io_state(&sbi->layout, &ios); |
| 343 | if (unlikely(ret)) { |
| 344 | EXOFS_ERR("%s: exofs_get_io_state failed.\n", __func__); |
| 345 | return ret; |
| 346 | } |
| 347 | |
| 348 | sbi->s_ess.s_nextid = cpu_to_le64(sbi->s_nextid); |
| 349 | sbi->s_ess.s_numfiles = cpu_to_le64(sbi->s_numfiles); |
| 350 | attrs[0].val_ptr = &sbi->s_ess; |
| 351 | |
| 352 | ios->cred = sbi->s_cred; |
| 353 | ios->done = stats_done; |
| 354 | ios->private = sbi; |
| 355 | ios->out_attr = attrs; |
| 356 | ios->out_attr_len = ARRAY_SIZE(attrs); |
| 357 | |
| 358 | ret = exofs_sbi_write(ios); |
| 359 | if (unlikely(ret)) { |
| 360 | EXOFS_ERR("%s: exofs_sbi_write failed.\n", __func__); |
| 361 | exofs_put_io_state(ios); |
| 362 | } |
| 363 | |
| 364 | return ret; |
| 365 | } |
| 366 | |
Boaz Harrosh | 85e44df | 2011-05-16 15:26:47 +0300 | [diff] [blame^] | 367 | /****************************************************************************** |
| 368 | * SUPERBLOCK FUNCTIONS |
| 369 | *****************************************************************************/ |
| 370 | static const struct super_operations exofs_sops; |
| 371 | static const struct export_operations exofs_export_ops; |
| 372 | |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 373 | /* |
| 374 | * Write the superblock to the OSD |
| 375 | */ |
Boaz Harrosh | baaf94c | 2009-06-14 16:52:10 +0300 | [diff] [blame] | 376 | int exofs_sync_fs(struct super_block *sb, int wait) |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 377 | { |
| 378 | struct exofs_sb_info *sbi; |
| 379 | struct exofs_fscb *fscb; |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 380 | struct exofs_io_state *ios; |
Christoph Hellwig | 80e09fb | 2009-06-08 10:03:58 +0200 | [diff] [blame] | 381 | int ret = -ENOMEM; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 382 | |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 383 | fscb = kmalloc(sizeof(*fscb), GFP_KERNEL); |
| 384 | if (unlikely(!fscb)) |
| 385 | return -ENOMEM; |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 386 | |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 387 | sbi = sb->s_fs_info; |
| 388 | |
| 389 | /* NOTE: We no longer dirty the super_block anywhere in exofs. The |
| 390 | * reason we write the fscb here on unmount is so we can stay backwards |
| 391 | * compatible with fscb->s_version == 1. (What we are not compatible |
| 392 | * with is if a new version FS crashed and then we try to mount an old |
| 393 | * version). Otherwise the exofs_fscb is read-only from mkfs time. All |
| 394 | * the writeable info is set in exofs_sbi_write_stats() above. |
| 395 | */ |
Boaz Harrosh | 45d3abc | 2010-01-28 11:46:16 +0200 | [diff] [blame] | 396 | ret = exofs_get_io_state(&sbi->layout, &ios); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 397 | if (unlikely(ret)) |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 398 | goto out; |
| 399 | |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 400 | lock_super(sb); |
| 401 | |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 402 | ios->length = offsetof(struct exofs_fscb, s_dev_table_oid); |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 403 | memset(fscb, 0, ios->length); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 404 | fscb->s_nextid = cpu_to_le64(sbi->s_nextid); |
| 405 | fscb->s_numfiles = cpu_to_le32(sbi->s_numfiles); |
| 406 | fscb->s_magic = cpu_to_le16(sb->s_magic); |
| 407 | fscb->s_newfs = 0; |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 408 | fscb->s_version = EXOFS_FSCB_VER; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 409 | |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 410 | ios->obj.id = EXOFS_SUPER_ID; |
| 411 | ios->offset = 0; |
| 412 | ios->kern_buff = fscb; |
| 413 | ios->cred = sbi->s_cred; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 414 | |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 415 | ret = exofs_sbi_write(ios); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 416 | if (unlikely(ret)) |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 417 | EXOFS_ERR("%s: exofs_sbi_write failed.\n", __func__); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 418 | else |
| 419 | sb->s_dirt = 0; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 420 | |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 421 | |
| 422 | unlock_super(sb); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 423 | out: |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 424 | EXOFS_DBGMSG("s_nextid=0x%llx ret=%d\n", _LLU(sbi->s_nextid), ret); |
| 425 | exofs_put_io_state(ios); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 426 | kfree(fscb); |
Christoph Hellwig | 80e09fb | 2009-06-08 10:03:58 +0200 | [diff] [blame] | 427 | return ret; |
| 428 | } |
| 429 | |
| 430 | static void exofs_write_super(struct super_block *sb) |
| 431 | { |
| 432 | if (!(sb->s_flags & MS_RDONLY)) |
| 433 | exofs_sync_fs(sb, 1); |
| 434 | else |
| 435 | sb->s_dirt = 0; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 436 | } |
| 437 | |
Boaz Harrosh | 19fe294 | 2009-09-03 20:38:02 +0300 | [diff] [blame] | 438 | static void _exofs_print_device(const char *msg, const char *dev_path, |
| 439 | struct osd_dev *od, u64 pid) |
| 440 | { |
| 441 | const struct osd_dev_info *odi = osduld_device_info(od); |
| 442 | |
| 443 | printk(KERN_NOTICE "exofs: %s %s osd_name-%s pid-0x%llx\n", |
| 444 | msg, dev_path ?: "", odi->osdname, _LLU(pid)); |
| 445 | } |
| 446 | |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 447 | void exofs_free_sbi(struct exofs_sb_info *sbi) |
| 448 | { |
Boaz Harrosh | 45d3abc | 2010-01-28 11:46:16 +0200 | [diff] [blame] | 449 | while (sbi->layout.s_numdevs) { |
| 450 | int i = --sbi->layout.s_numdevs; |
| 451 | struct osd_dev *od = sbi->layout.s_ods[i]; |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 452 | |
| 453 | if (od) { |
Boaz Harrosh | 45d3abc | 2010-01-28 11:46:16 +0200 | [diff] [blame] | 454 | sbi->layout.s_ods[i] = NULL; |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 455 | osduld_put_device(od); |
| 456 | } |
| 457 | } |
Boaz Harrosh | 6d4073e | 2011-07-27 17:51:53 -0700 | [diff] [blame] | 458 | if (sbi->layout.s_ods != sbi->_min_one_dev) |
| 459 | kfree(sbi->layout.s_ods); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 460 | kfree(sbi); |
| 461 | } |
| 462 | |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 463 | /* |
| 464 | * This function is called when the vfs is freeing the superblock. We just |
| 465 | * need to free our own part. |
| 466 | */ |
| 467 | static void exofs_put_super(struct super_block *sb) |
| 468 | { |
| 469 | int num_pend; |
| 470 | struct exofs_sb_info *sbi = sb->s_fs_info; |
| 471 | |
| 472 | /* make sure there are no pending commands */ |
| 473 | for (num_pend = atomic_read(&sbi->s_curr_pending); num_pend > 0; |
| 474 | num_pend = atomic_read(&sbi->s_curr_pending)) { |
| 475 | wait_queue_head_t wq; |
Boaz Harrosh | a49fb4c | 2011-02-07 18:12:15 +0200 | [diff] [blame] | 476 | |
| 477 | printk(KERN_NOTICE "%s: !!Pending operations in flight. " |
| 478 | "This is a BUG. please report to osd-dev@open-osd.org\n", |
| 479 | __func__); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 480 | init_waitqueue_head(&wq); |
| 481 | wait_event_timeout(wq, |
| 482 | (atomic_read(&sbi->s_curr_pending) == 0), |
| 483 | msecs_to_jiffies(100)); |
| 484 | } |
| 485 | |
Boaz Harrosh | 45d3abc | 2010-01-28 11:46:16 +0200 | [diff] [blame] | 486 | _exofs_print_device("Unmounting", NULL, sbi->layout.s_ods[0], |
| 487 | sbi->layout.s_pid); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 488 | |
Jens Axboe | b3d0ab7 | 2010-04-22 12:26:04 +0200 | [diff] [blame] | 489 | bdi_destroy(&sbi->bdi); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 490 | exofs_free_sbi(sbi); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 491 | sb->s_fs_info = NULL; |
| 492 | } |
| 493 | |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 494 | static int _read_and_match_data_map(struct exofs_sb_info *sbi, unsigned numdevs, |
| 495 | struct exofs_device_table *dt) |
| 496 | { |
Boaz Harrosh | 5d952b8 | 2010-02-01 13:35:51 +0200 | [diff] [blame] | 497 | u64 stripe_length; |
| 498 | |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 499 | sbi->data_map.odm_num_comps = |
| 500 | le32_to_cpu(dt->dt_data_map.cb_num_comps); |
| 501 | sbi->data_map.odm_stripe_unit = |
| 502 | le64_to_cpu(dt->dt_data_map.cb_stripe_unit); |
| 503 | sbi->data_map.odm_group_width = |
| 504 | le32_to_cpu(dt->dt_data_map.cb_group_width); |
| 505 | sbi->data_map.odm_group_depth = |
| 506 | le32_to_cpu(dt->dt_data_map.cb_group_depth); |
| 507 | sbi->data_map.odm_mirror_cnt = |
| 508 | le32_to_cpu(dt->dt_data_map.cb_mirror_cnt); |
| 509 | sbi->data_map.odm_raid_algorithm = |
| 510 | le32_to_cpu(dt->dt_data_map.cb_raid_algorithm); |
| 511 | |
Boaz Harrosh | 50a76fd | 2010-02-11 13:01:39 +0200 | [diff] [blame] | 512 | /* FIXME: Only raid0 for now. if not so, do not mount */ |
Boaz Harrosh | 5d952b8 | 2010-02-01 13:35:51 +0200 | [diff] [blame] | 513 | if (sbi->data_map.odm_num_comps != numdevs) { |
| 514 | EXOFS_ERR("odm_num_comps(%u) != numdevs(%u)\n", |
| 515 | sbi->data_map.odm_num_comps, numdevs); |
| 516 | return -EINVAL; |
| 517 | } |
| 518 | if (sbi->data_map.odm_raid_algorithm != PNFS_OSD_RAID_0) { |
| 519 | EXOFS_ERR("Only RAID_0 for now\n"); |
| 520 | return -EINVAL; |
| 521 | } |
| 522 | if (0 != (numdevs % (sbi->data_map.odm_mirror_cnt + 1))) { |
| 523 | EXOFS_ERR("Data Map wrong, numdevs=%d mirrors=%d\n", |
| 524 | numdevs, sbi->data_map.odm_mirror_cnt); |
| 525 | return -EINVAL; |
| 526 | } |
| 527 | |
Boaz Harrosh | 5d952b8 | 2010-02-01 13:35:51 +0200 | [diff] [blame] | 528 | if (0 != (sbi->data_map.odm_stripe_unit & ~PAGE_MASK)) { |
| 529 | EXOFS_ERR("Stripe Unit(0x%llx)" |
| 530 | " must be Multples of PAGE_SIZE(0x%lx)\n", |
| 531 | _LLU(sbi->data_map.odm_stripe_unit), PAGE_SIZE); |
| 532 | return -EINVAL; |
| 533 | } |
| 534 | |
| 535 | sbi->layout.stripe_unit = sbi->data_map.odm_stripe_unit; |
| 536 | sbi->layout.mirrors_p1 = sbi->data_map.odm_mirror_cnt + 1; |
Boaz Harrosh | 50a76fd | 2010-02-11 13:01:39 +0200 | [diff] [blame] | 537 | |
| 538 | if (sbi->data_map.odm_group_width) { |
| 539 | sbi->layout.group_width = sbi->data_map.odm_group_width; |
| 540 | sbi->layout.group_depth = sbi->data_map.odm_group_depth; |
| 541 | if (!sbi->layout.group_depth) { |
| 542 | EXOFS_ERR("group_depth == 0 && group_width != 0\n"); |
| 543 | return -EINVAL; |
| 544 | } |
| 545 | sbi->layout.group_count = sbi->data_map.odm_num_comps / |
| 546 | sbi->layout.mirrors_p1 / |
| 547 | sbi->data_map.odm_group_width; |
| 548 | } else { |
| 549 | if (sbi->data_map.odm_group_depth) { |
| 550 | printk(KERN_NOTICE "Warning: group_depth ignored " |
| 551 | "group_width == 0 && group_depth == %d\n", |
| 552 | sbi->data_map.odm_group_depth); |
| 553 | sbi->data_map.odm_group_depth = 0; |
| 554 | } |
| 555 | sbi->layout.group_width = sbi->data_map.odm_num_comps / |
Boaz Harrosh | 5d952b8 | 2010-02-01 13:35:51 +0200 | [diff] [blame] | 556 | sbi->layout.mirrors_p1; |
Boaz Harrosh | 50a76fd | 2010-02-11 13:01:39 +0200 | [diff] [blame] | 557 | sbi->layout.group_depth = -1; |
| 558 | sbi->layout.group_count = 1; |
| 559 | } |
| 560 | |
| 561 | stripe_length = (u64)sbi->layout.group_width * sbi->layout.stripe_unit; |
| 562 | if (stripe_length >= (1ULL << 32)) { |
| 563 | EXOFS_ERR("Total Stripe length(0x%llx)" |
| 564 | " >= 32bit is not supported\n", _LLU(stripe_length)); |
| 565 | return -EINVAL; |
| 566 | } |
Boaz Harrosh | 5d952b8 | 2010-02-01 13:35:51 +0200 | [diff] [blame] | 567 | |
Boaz Harrosh | 6d4073e | 2011-07-27 17:51:53 -0700 | [diff] [blame] | 568 | EXOFS_DBGMSG("exofs: layout: " |
| 569 | "num_comps=%u stripe_unit=0x%x group_width=%u " |
| 570 | "group_depth=0x%llx mirrors_p1=%u raid_algorithm=%u\n", |
| 571 | numdevs, |
| 572 | sbi->layout.stripe_unit, |
| 573 | sbi->layout.group_width, |
| 574 | _LLU(sbi->layout.group_depth), |
| 575 | sbi->layout.mirrors_p1, |
| 576 | sbi->data_map.odm_raid_algorithm); |
Boaz Harrosh | 5d952b8 | 2010-02-01 13:35:51 +0200 | [diff] [blame] | 577 | return 0; |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 578 | } |
| 579 | |
bharrosh@panasas.com | 66cd6ca | 2010-10-07 14:28:18 -0400 | [diff] [blame] | 580 | static unsigned __ra_pages(struct exofs_layout *layout) |
| 581 | { |
| 582 | const unsigned _MIN_RA = 32; /* min 128K read-ahead */ |
| 583 | unsigned ra_pages = layout->group_width * layout->stripe_unit / |
| 584 | PAGE_SIZE; |
| 585 | unsigned max_io_pages = exofs_max_io_pages(layout, ~0); |
| 586 | |
| 587 | ra_pages *= 2; /* two stripes */ |
| 588 | if (ra_pages < _MIN_RA) |
| 589 | ra_pages = roundup(_MIN_RA, ra_pages / 2); |
| 590 | |
| 591 | if (ra_pages > max_io_pages) |
| 592 | ra_pages = max_io_pages; |
| 593 | |
| 594 | return ra_pages; |
| 595 | } |
| 596 | |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 597 | /* @odi is valid only as long as @fscb_dev is valid */ |
| 598 | static int exofs_devs_2_odi(struct exofs_dt_device_info *dt_dev, |
| 599 | struct osd_dev_info *odi) |
| 600 | { |
| 601 | odi->systemid_len = le32_to_cpu(dt_dev->systemid_len); |
| 602 | memcpy(odi->systemid, dt_dev->systemid, odi->systemid_len); |
| 603 | |
| 604 | odi->osdname_len = le32_to_cpu(dt_dev->osdname_len); |
| 605 | odi->osdname = dt_dev->osdname; |
| 606 | |
| 607 | /* FIXME support long names. Will need a _put function */ |
| 608 | if (dt_dev->long_name_offset) |
| 609 | return -EINVAL; |
| 610 | |
| 611 | /* Make sure osdname is printable! |
| 612 | * mkexofs should give us space for a null-terminator else the |
| 613 | * device-table is invalid. |
| 614 | */ |
| 615 | if (unlikely(odi->osdname_len >= sizeof(dt_dev->osdname))) |
| 616 | odi->osdname_len = sizeof(dt_dev->osdname) - 1; |
| 617 | dt_dev->osdname[odi->osdname_len] = 0; |
| 618 | |
| 619 | /* If it's all zeros something is bad we read past end-of-obj */ |
| 620 | return !(odi->systemid_len || odi->osdname_len); |
| 621 | } |
| 622 | |
Boaz Harrosh | 6d4073e | 2011-07-27 17:51:53 -0700 | [diff] [blame] | 623 | static int exofs_read_lookup_dev_table(struct exofs_sb_info *sbi, |
| 624 | struct osd_dev *fscb_od, |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 625 | unsigned table_count) |
| 626 | { |
Boaz Harrosh | 45d3abc | 2010-01-28 11:46:16 +0200 | [diff] [blame] | 627 | struct osd_obj_id obj = {.partition = sbi->layout.s_pid, |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 628 | .id = EXOFS_DEVTABLE_ID}; |
| 629 | struct exofs_device_table *dt; |
| 630 | unsigned table_bytes = table_count * sizeof(dt->dt_dev_table[0]) + |
| 631 | sizeof(*dt); |
| 632 | unsigned numdevs, i; |
| 633 | int ret; |
| 634 | |
| 635 | dt = kmalloc(table_bytes, GFP_KERNEL); |
| 636 | if (unlikely(!dt)) { |
| 637 | EXOFS_ERR("ERROR: allocating %x bytes for device table\n", |
| 638 | table_bytes); |
| 639 | return -ENOMEM; |
| 640 | } |
| 641 | |
Boaz Harrosh | 45d3abc | 2010-01-28 11:46:16 +0200 | [diff] [blame] | 642 | sbi->layout.s_numdevs = 0; |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 643 | ret = exofs_read_kern(fscb_od, sbi->s_cred, &obj, 0, dt, table_bytes); |
| 644 | if (unlikely(ret)) { |
| 645 | EXOFS_ERR("ERROR: reading device table\n"); |
| 646 | goto out; |
| 647 | } |
| 648 | |
| 649 | numdevs = le64_to_cpu(dt->dt_num_devices); |
| 650 | if (unlikely(!numdevs)) { |
| 651 | ret = -EINVAL; |
| 652 | goto out; |
| 653 | } |
| 654 | WARN_ON(table_count != numdevs); |
| 655 | |
| 656 | ret = _read_and_match_data_map(sbi, numdevs, dt); |
| 657 | if (unlikely(ret)) |
| 658 | goto out; |
| 659 | |
| 660 | if (likely(numdevs > 1)) { |
Boaz Harrosh | 45d3abc | 2010-01-28 11:46:16 +0200 | [diff] [blame] | 661 | unsigned size = numdevs * sizeof(sbi->layout.s_ods[0]); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 662 | |
Boaz Harrosh | 6d4073e | 2011-07-27 17:51:53 -0700 | [diff] [blame] | 663 | sbi->layout.s_ods = kzalloc(size, GFP_KERNEL); |
| 664 | if (unlikely(!sbi->layout.s_ods)) { |
| 665 | EXOFS_ERR("ERROR: faild allocating Device array[%d]\n", |
| 666 | numdevs); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 667 | ret = -ENOMEM; |
| 668 | goto out; |
| 669 | } |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 670 | } |
| 671 | |
| 672 | for (i = 0; i < numdevs; i++) { |
| 673 | struct exofs_fscb fscb; |
| 674 | struct osd_dev_info odi; |
| 675 | struct osd_dev *od; |
| 676 | |
| 677 | if (exofs_devs_2_odi(&dt->dt_dev_table[i], &odi)) { |
| 678 | EXOFS_ERR("ERROR: Read all-zeros device entry\n"); |
| 679 | ret = -EINVAL; |
| 680 | goto out; |
| 681 | } |
| 682 | |
| 683 | printk(KERN_NOTICE "Add device[%d]: osd_name-%s\n", |
| 684 | i, odi.osdname); |
| 685 | |
| 686 | /* On all devices the device table is identical. The user can |
| 687 | * specify any one of the participating devices on the command |
| 688 | * line. We always keep them in device-table order. |
| 689 | */ |
| 690 | if (fscb_od && osduld_device_same(fscb_od, &odi)) { |
Boaz Harrosh | 45d3abc | 2010-01-28 11:46:16 +0200 | [diff] [blame] | 691 | sbi->layout.s_ods[i] = fscb_od; |
| 692 | ++sbi->layout.s_numdevs; |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 693 | fscb_od = NULL; |
| 694 | continue; |
| 695 | } |
| 696 | |
| 697 | od = osduld_info_lookup(&odi); |
Tobias Klauser | 2c722c9 | 2010-12-09 15:55:21 +0100 | [diff] [blame] | 698 | if (IS_ERR(od)) { |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 699 | ret = PTR_ERR(od); |
| 700 | EXOFS_ERR("ERROR: device requested is not found " |
| 701 | "osd_name-%s =>%d\n", odi.osdname, ret); |
| 702 | goto out; |
| 703 | } |
| 704 | |
Boaz Harrosh | 45d3abc | 2010-01-28 11:46:16 +0200 | [diff] [blame] | 705 | sbi->layout.s_ods[i] = od; |
| 706 | ++sbi->layout.s_numdevs; |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 707 | |
| 708 | /* Read the fscb of the other devices to make sure the FS |
| 709 | * partition is there. |
| 710 | */ |
| 711 | ret = exofs_read_kern(od, sbi->s_cred, &obj, 0, &fscb, |
| 712 | sizeof(fscb)); |
| 713 | if (unlikely(ret)) { |
| 714 | EXOFS_ERR("ERROR: Malformed participating device " |
| 715 | "error reading fscb osd_name-%s\n", |
| 716 | odi.osdname); |
| 717 | goto out; |
| 718 | } |
| 719 | |
| 720 | /* TODO: verify other information is correct and FS-uuid |
| 721 | * matches. Benny what did you say about device table |
| 722 | * generation and old devices? |
| 723 | */ |
| 724 | } |
| 725 | |
| 726 | out: |
| 727 | kfree(dt); |
| 728 | if (unlikely(!ret && fscb_od)) { |
| 729 | EXOFS_ERR( |
| 730 | "ERROR: Bad device-table container device not present\n"); |
| 731 | osduld_put_device(fscb_od); |
| 732 | ret = -EINVAL; |
| 733 | } |
| 734 | |
| 735 | return ret; |
| 736 | } |
| 737 | |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 738 | /* |
| 739 | * Read the superblock from the OSD and fill in the fields |
| 740 | */ |
| 741 | static int exofs_fill_super(struct super_block *sb, void *data, int silent) |
| 742 | { |
| 743 | struct inode *root; |
| 744 | struct exofs_mountopt *opts = data; |
| 745 | struct exofs_sb_info *sbi; /*extended info */ |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 746 | struct osd_dev *od; /* Master device */ |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 747 | struct exofs_fscb fscb; /*on-disk superblock info */ |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 748 | struct osd_obj_id obj; |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 749 | unsigned table_count; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 750 | int ret; |
| 751 | |
| 752 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
| 753 | if (!sbi) |
| 754 | return -ENOMEM; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 755 | |
| 756 | /* use mount options to fill superblock */ |
Boaz Harrosh | 9ed9648 | 2011-01-31 14:32:14 +0200 | [diff] [blame] | 757 | if (opts->is_osdname) { |
| 758 | struct osd_dev_info odi = {.systemid_len = 0}; |
| 759 | |
| 760 | odi.osdname_len = strlen(opts->dev_name); |
| 761 | odi.osdname = (u8 *)opts->dev_name; |
| 762 | od = osduld_info_lookup(&odi); |
Boaz Harrosh | 9ce7304 | 2011-08-03 20:18:01 -0700 | [diff] [blame] | 763 | kfree(opts->dev_name); |
| 764 | opts->dev_name = NULL; |
Boaz Harrosh | 9ed9648 | 2011-01-31 14:32:14 +0200 | [diff] [blame] | 765 | } else { |
| 766 | od = osduld_path_lookup(opts->dev_name); |
| 767 | } |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 768 | if (IS_ERR(od)) { |
Boaz Harrosh | 9ed9648 | 2011-01-31 14:32:14 +0200 | [diff] [blame] | 769 | ret = -EINVAL; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 770 | goto free_sbi; |
| 771 | } |
| 772 | |
Boaz Harrosh | 45d3abc | 2010-01-28 11:46:16 +0200 | [diff] [blame] | 773 | /* Default layout in case we do not have a device-table */ |
Boaz Harrosh | 5d952b8 | 2010-02-01 13:35:51 +0200 | [diff] [blame] | 774 | sbi->layout.stripe_unit = PAGE_SIZE; |
| 775 | sbi->layout.mirrors_p1 = 1; |
| 776 | sbi->layout.group_width = 1; |
Boaz Harrosh | 50a76fd | 2010-02-11 13:01:39 +0200 | [diff] [blame] | 777 | sbi->layout.group_depth = -1; |
| 778 | sbi->layout.group_count = 1; |
Boaz Harrosh | 6d4073e | 2011-07-27 17:51:53 -0700 | [diff] [blame] | 779 | sbi->layout.s_ods = sbi->_min_one_dev; |
Boaz Harrosh | 45d3abc | 2010-01-28 11:46:16 +0200 | [diff] [blame] | 780 | sbi->layout.s_numdevs = 1; |
| 781 | sbi->layout.s_pid = opts->pid; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 782 | sbi->s_timeout = opts->timeout; |
| 783 | |
| 784 | /* fill in some other data by hand */ |
| 785 | memset(sb->s_id, 0, sizeof(sb->s_id)); |
| 786 | strcpy(sb->s_id, "exofs"); |
| 787 | sb->s_blocksize = EXOFS_BLKSIZE; |
| 788 | sb->s_blocksize_bits = EXOFS_BLKSHIFT; |
| 789 | sb->s_maxbytes = MAX_LFS_FILESIZE; |
| 790 | atomic_set(&sbi->s_curr_pending, 0); |
| 791 | sb->s_bdev = NULL; |
| 792 | sb->s_dev = 0; |
| 793 | |
Boaz Harrosh | 45d3abc | 2010-01-28 11:46:16 +0200 | [diff] [blame] | 794 | obj.partition = sbi->layout.s_pid; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 795 | obj.id = EXOFS_SUPER_ID; |
| 796 | exofs_make_credential(sbi->s_cred, &obj); |
| 797 | |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 798 | ret = exofs_read_kern(od, sbi->s_cred, &obj, 0, &fscb, sizeof(fscb)); |
| 799 | if (unlikely(ret)) |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 800 | goto free_sbi; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 801 | |
| 802 | sb->s_magic = le16_to_cpu(fscb.s_magic); |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 803 | /* NOTE: we read below to be backward compatible with old versions */ |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 804 | sbi->s_nextid = le64_to_cpu(fscb.s_nextid); |
| 805 | sbi->s_numfiles = le32_to_cpu(fscb.s_numfiles); |
| 806 | |
| 807 | /* make sure what we read from the object store is correct */ |
| 808 | if (sb->s_magic != EXOFS_SUPER_MAGIC) { |
| 809 | if (!silent) |
| 810 | EXOFS_ERR("ERROR: Bad magic value\n"); |
| 811 | ret = -EINVAL; |
| 812 | goto free_sbi; |
| 813 | } |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 814 | if (le32_to_cpu(fscb.s_version) > EXOFS_FSCB_VER) { |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 815 | EXOFS_ERR("ERROR: Bad FSCB version expected-%d got-%d\n", |
| 816 | EXOFS_FSCB_VER, le32_to_cpu(fscb.s_version)); |
| 817 | ret = -EINVAL; |
| 818 | goto free_sbi; |
| 819 | } |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 820 | |
| 821 | /* start generation numbers from a random point */ |
| 822 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); |
| 823 | spin_lock_init(&sbi->s_next_gen_lock); |
| 824 | |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 825 | table_count = le64_to_cpu(fscb.s_dev_table_count); |
| 826 | if (table_count) { |
Boaz Harrosh | 6d4073e | 2011-07-27 17:51:53 -0700 | [diff] [blame] | 827 | ret = exofs_read_lookup_dev_table(sbi, od, table_count); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 828 | if (unlikely(ret)) |
| 829 | goto free_sbi; |
Boaz Harrosh | 6d4073e | 2011-07-27 17:51:53 -0700 | [diff] [blame] | 830 | } else { |
| 831 | sbi->layout.s_ods[0] = od; |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 832 | } |
| 833 | |
Boaz Harrosh | 1cea312 | 2011-02-03 17:53:25 +0200 | [diff] [blame] | 834 | __sbi_read_stats(sbi); |
| 835 | |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 836 | /* set up operation vectors */ |
bharrosh@panasas.com | 66cd6ca | 2010-10-07 14:28:18 -0400 | [diff] [blame] | 837 | sbi->bdi.ra_pages = __ra_pages(&sbi->layout); |
Jens Axboe | b3d0ab7 | 2010-04-22 12:26:04 +0200 | [diff] [blame] | 838 | sb->s_bdi = &sbi->bdi; |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 839 | sb->s_fs_info = sbi; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 840 | sb->s_op = &exofs_sops; |
Boaz Harrosh | 8cf74b3 | 2009-03-22 12:47:26 +0200 | [diff] [blame] | 841 | sb->s_export_op = &exofs_export_ops; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 842 | root = exofs_iget(sb, EXOFS_ROOT_ID - EXOFS_OBJ_OFF); |
| 843 | if (IS_ERR(root)) { |
| 844 | EXOFS_ERR("ERROR: exofs_iget failed\n"); |
| 845 | ret = PTR_ERR(root); |
| 846 | goto free_sbi; |
| 847 | } |
| 848 | sb->s_root = d_alloc_root(root); |
| 849 | if (!sb->s_root) { |
| 850 | iput(root); |
| 851 | EXOFS_ERR("ERROR: get root inode failed\n"); |
| 852 | ret = -ENOMEM; |
| 853 | goto free_sbi; |
| 854 | } |
| 855 | |
| 856 | if (!S_ISDIR(root->i_mode)) { |
| 857 | dput(sb->s_root); |
| 858 | sb->s_root = NULL; |
| 859 | EXOFS_ERR("ERROR: corrupt root inode (mode = %hd)\n", |
| 860 | root->i_mode); |
| 861 | ret = -EINVAL; |
| 862 | goto free_sbi; |
| 863 | } |
| 864 | |
Boaz Harrosh | 6d4073e | 2011-07-27 17:51:53 -0700 | [diff] [blame] | 865 | ret = bdi_setup_and_register(&sbi->bdi, "exofs", BDI_CAP_MAP_COPY); |
| 866 | if (ret) { |
| 867 | EXOFS_DBGMSG("Failed to bdi_setup_and_register\n"); |
| 868 | goto free_sbi; |
| 869 | } |
| 870 | |
Boaz Harrosh | 45d3abc | 2010-01-28 11:46:16 +0200 | [diff] [blame] | 871 | _exofs_print_device("Mounting", opts->dev_name, sbi->layout.s_ods[0], |
| 872 | sbi->layout.s_pid); |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 873 | return 0; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 874 | |
| 875 | free_sbi: |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 876 | EXOFS_ERR("Unable to mount exofs on %s pid=0x%llx err=%d\n", |
Boaz Harrosh | 45d3abc | 2010-01-28 11:46:16 +0200 | [diff] [blame] | 877 | opts->dev_name, sbi->layout.s_pid, ret); |
Boaz Harrosh | 04dc1e8 | 2009-11-16 16:03:05 +0200 | [diff] [blame] | 878 | exofs_free_sbi(sbi); |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 879 | return ret; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 880 | } |
| 881 | |
| 882 | /* |
| 883 | * Set up the superblock (calls exofs_fill_super eventually) |
| 884 | */ |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 885 | static struct dentry *exofs_mount(struct file_system_type *type, |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 886 | int flags, const char *dev_name, |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 887 | void *data) |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 888 | { |
| 889 | struct exofs_mountopt opts; |
| 890 | int ret; |
| 891 | |
| 892 | ret = parse_options(data, &opts); |
| 893 | if (ret) |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 894 | return ERR_PTR(ret); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 895 | |
Boaz Harrosh | 9ed9648 | 2011-01-31 14:32:14 +0200 | [diff] [blame] | 896 | if (!opts.dev_name) |
| 897 | opts.dev_name = dev_name; |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 898 | return mount_nodev(type, flags, &opts, exofs_fill_super); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 899 | } |
| 900 | |
| 901 | /* |
| 902 | * Return information about the file system state in the buffer. This is used |
| 903 | * by the 'df' command, for example. |
| 904 | */ |
| 905 | static int exofs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 906 | { |
| 907 | struct super_block *sb = dentry->d_sb; |
| 908 | struct exofs_sb_info *sbi = sb->s_fs_info; |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 909 | struct exofs_io_state *ios; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 910 | struct osd_attr attrs[] = { |
| 911 | ATTR_DEF(OSD_APAGE_PARTITION_QUOTAS, |
| 912 | OSD_ATTR_PQ_CAPACITY_QUOTA, sizeof(__be64)), |
| 913 | ATTR_DEF(OSD_APAGE_PARTITION_INFORMATION, |
| 914 | OSD_ATTR_PI_USED_CAPACITY, sizeof(__be64)), |
| 915 | }; |
| 916 | uint64_t capacity = ULLONG_MAX; |
| 917 | uint64_t used = ULLONG_MAX; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 918 | uint8_t cred_a[OSD_CAP_LEN]; |
| 919 | int ret; |
| 920 | |
Boaz Harrosh | 45d3abc | 2010-01-28 11:46:16 +0200 | [diff] [blame] | 921 | ret = exofs_get_io_state(&sbi->layout, &ios); |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 922 | if (ret) { |
| 923 | EXOFS_DBGMSG("exofs_get_io_state failed.\n"); |
| 924 | return ret; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 925 | } |
| 926 | |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 927 | exofs_make_credential(cred_a, &ios->obj); |
| 928 | ios->cred = sbi->s_cred; |
| 929 | ios->in_attr = attrs; |
| 930 | ios->in_attr_len = ARRAY_SIZE(attrs); |
| 931 | |
| 932 | ret = exofs_sbi_read(ios); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 933 | if (unlikely(ret)) |
| 934 | goto out; |
| 935 | |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 936 | ret = extract_attr_from_ios(ios, &attrs[0]); |
Boaz Harrosh | cae012d | 2009-11-02 18:19:24 +0200 | [diff] [blame] | 937 | if (likely(!ret)) { |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 938 | capacity = get_unaligned_be64(attrs[0].val_ptr); |
Boaz Harrosh | cae012d | 2009-11-02 18:19:24 +0200 | [diff] [blame] | 939 | if (unlikely(!capacity)) |
| 940 | capacity = ULLONG_MAX; |
| 941 | } else |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 942 | EXOFS_DBGMSG("exofs_statfs: get capacity failed.\n"); |
| 943 | |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 944 | ret = extract_attr_from_ios(ios, &attrs[1]); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 945 | if (likely(!ret)) |
| 946 | used = get_unaligned_be64(attrs[1].val_ptr); |
| 947 | else |
| 948 | EXOFS_DBGMSG("exofs_statfs: get used-space failed.\n"); |
| 949 | |
| 950 | /* fill in the stats buffer */ |
| 951 | buf->f_type = EXOFS_SUPER_MAGIC; |
| 952 | buf->f_bsize = EXOFS_BLKSIZE; |
Boaz Harrosh | cae012d | 2009-11-02 18:19:24 +0200 | [diff] [blame] | 953 | buf->f_blocks = capacity >> 9; |
| 954 | buf->f_bfree = (capacity - used) >> 9; |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 955 | buf->f_bavail = buf->f_bfree; |
| 956 | buf->f_files = sbi->s_numfiles; |
| 957 | buf->f_ffree = EXOFS_MAX_ID - sbi->s_numfiles; |
| 958 | buf->f_namelen = EXOFS_NAME_LEN; |
| 959 | |
| 960 | out: |
Boaz Harrosh | 06886a5 | 2009-11-08 14:54:08 +0200 | [diff] [blame] | 961 | exofs_put_io_state(ios); |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 962 | return ret; |
| 963 | } |
| 964 | |
| 965 | static const struct super_operations exofs_sops = { |
| 966 | .alloc_inode = exofs_alloc_inode, |
| 967 | .destroy_inode = exofs_destroy_inode, |
| 968 | .write_inode = exofs_write_inode, |
Al Viro | 4ec70c9 | 2010-06-07 11:42:26 -0400 | [diff] [blame] | 969 | .evict_inode = exofs_evict_inode, |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 970 | .put_super = exofs_put_super, |
| 971 | .write_super = exofs_write_super, |
Christoph Hellwig | 80e09fb | 2009-06-08 10:03:58 +0200 | [diff] [blame] | 972 | .sync_fs = exofs_sync_fs, |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 973 | .statfs = exofs_statfs, |
| 974 | }; |
| 975 | |
| 976 | /****************************************************************************** |
Boaz Harrosh | 8cf74b3 | 2009-03-22 12:47:26 +0200 | [diff] [blame] | 977 | * EXPORT OPERATIONS |
| 978 | *****************************************************************************/ |
| 979 | |
| 980 | struct dentry *exofs_get_parent(struct dentry *child) |
| 981 | { |
| 982 | unsigned long ino = exofs_parent_ino(child); |
| 983 | |
| 984 | if (!ino) |
Al Viro | a803b80 | 2011-07-08 20:56:55 -0400 | [diff] [blame] | 985 | return ERR_PTR(-ESTALE); |
Boaz Harrosh | 8cf74b3 | 2009-03-22 12:47:26 +0200 | [diff] [blame] | 986 | |
| 987 | return d_obtain_alias(exofs_iget(child->d_inode->i_sb, ino)); |
| 988 | } |
| 989 | |
| 990 | static struct inode *exofs_nfs_get_inode(struct super_block *sb, |
| 991 | u64 ino, u32 generation) |
| 992 | { |
| 993 | struct inode *inode; |
| 994 | |
| 995 | inode = exofs_iget(sb, ino); |
| 996 | if (IS_ERR(inode)) |
| 997 | return ERR_CAST(inode); |
| 998 | if (generation && inode->i_generation != generation) { |
| 999 | /* we didn't find the right inode.. */ |
| 1000 | iput(inode); |
| 1001 | return ERR_PTR(-ESTALE); |
| 1002 | } |
| 1003 | return inode; |
| 1004 | } |
| 1005 | |
| 1006 | static struct dentry *exofs_fh_to_dentry(struct super_block *sb, |
| 1007 | struct fid *fid, int fh_len, int fh_type) |
| 1008 | { |
| 1009 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
| 1010 | exofs_nfs_get_inode); |
| 1011 | } |
| 1012 | |
| 1013 | static struct dentry *exofs_fh_to_parent(struct super_block *sb, |
| 1014 | struct fid *fid, int fh_len, int fh_type) |
| 1015 | { |
| 1016 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
| 1017 | exofs_nfs_get_inode); |
| 1018 | } |
| 1019 | |
| 1020 | static const struct export_operations exofs_export_ops = { |
| 1021 | .fh_to_dentry = exofs_fh_to_dentry, |
| 1022 | .fh_to_parent = exofs_fh_to_parent, |
| 1023 | .get_parent = exofs_get_parent, |
| 1024 | }; |
| 1025 | |
| 1026 | /****************************************************************************** |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 1027 | * INSMOD/RMMOD |
| 1028 | *****************************************************************************/ |
| 1029 | |
| 1030 | /* |
| 1031 | * struct that describes this file system |
| 1032 | */ |
| 1033 | static struct file_system_type exofs_type = { |
| 1034 | .owner = THIS_MODULE, |
| 1035 | .name = "exofs", |
Al Viro | 3c26ff6 | 2010-07-25 11:46:36 +0400 | [diff] [blame] | 1036 | .mount = exofs_mount, |
Boaz Harrosh | ba9e5e9 | 2008-10-28 16:11:41 +0200 | [diff] [blame] | 1037 | .kill_sb = generic_shutdown_super, |
| 1038 | }; |
| 1039 | |
| 1040 | static int __init init_exofs(void) |
| 1041 | { |
| 1042 | int err; |
| 1043 | |
| 1044 | err = init_inodecache(); |
| 1045 | if (err) |
| 1046 | goto out; |
| 1047 | |
| 1048 | err = register_filesystem(&exofs_type); |
| 1049 | if (err) |
| 1050 | goto out_d; |
| 1051 | |
| 1052 | return 0; |
| 1053 | out_d: |
| 1054 | destroy_inodecache(); |
| 1055 | out: |
| 1056 | return err; |
| 1057 | } |
| 1058 | |
| 1059 | static void __exit exit_exofs(void) |
| 1060 | { |
| 1061 | unregister_filesystem(&exofs_type); |
| 1062 | destroy_inodecache(); |
| 1063 | } |
| 1064 | |
| 1065 | MODULE_AUTHOR("Avishay Traeger <avishay@gmail.com>"); |
| 1066 | MODULE_DESCRIPTION("exofs"); |
| 1067 | MODULE_LICENSE("GPL"); |
| 1068 | |
| 1069 | module_init(init_exofs) |
| 1070 | module_exit(exit_exofs) |