| 1 | /* |
| 2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
| 3 | * Copyright (C) 2004-2008 Red Hat, Inc. All rights reserved. |
| 4 | * |
| 5 | * This copyrighted material is made available to anyone wishing to use, |
| 6 | * modify, copy, or redistribute it subject to the terms and conditions |
| 7 | * of the GNU General Public License version 2. |
| 8 | */ |
| 9 | |
| 10 | #include <linux/sched.h> |
| 11 | #include <linux/slab.h> |
| 12 | #include <linux/spinlock.h> |
| 13 | #include <linux/completion.h> |
| 14 | #include <linux/buffer_head.h> |
| 15 | #include <linux/posix_acl.h> |
| 16 | #include <linux/sort.h> |
| 17 | #include <linux/gfs2_ondisk.h> |
| 18 | #include <linux/crc32.h> |
| 19 | #include <linux/lm_interface.h> |
| 20 | #include <linux/security.h> |
| 21 | #include <linux/time.h> |
| 22 | |
| 23 | #include "gfs2.h" |
| 24 | #include "incore.h" |
| 25 | #include "acl.h" |
| 26 | #include "bmap.h" |
| 27 | #include "dir.h" |
| 28 | #include "eattr.h" |
| 29 | #include "glock.h" |
| 30 | #include "glops.h" |
| 31 | #include "inode.h" |
| 32 | #include "log.h" |
| 33 | #include "meta_io.h" |
| 34 | #include "ops_address.h" |
| 35 | #include "quota.h" |
| 36 | #include "rgrp.h" |
| 37 | #include "trans.h" |
| 38 | #include "util.h" |
| 39 | |
| 40 | struct gfs2_inum_range_host { |
| 41 | u64 ir_start; |
| 42 | u64 ir_length; |
| 43 | }; |
| 44 | |
| 45 | static int iget_test(struct inode *inode, void *opaque) |
| 46 | { |
| 47 | struct gfs2_inode *ip = GFS2_I(inode); |
| 48 | u64 *no_addr = opaque; |
| 49 | |
| 50 | if (ip->i_no_addr == *no_addr && test_bit(GIF_USER, &ip->i_flags)) |
| 51 | return 1; |
| 52 | |
| 53 | return 0; |
| 54 | } |
| 55 | |
| 56 | static int iget_set(struct inode *inode, void *opaque) |
| 57 | { |
| 58 | struct gfs2_inode *ip = GFS2_I(inode); |
| 59 | u64 *no_addr = opaque; |
| 60 | |
| 61 | inode->i_ino = (unsigned long)*no_addr; |
| 62 | ip->i_no_addr = *no_addr; |
| 63 | set_bit(GIF_USER, &ip->i_flags); |
| 64 | return 0; |
| 65 | } |
| 66 | |
| 67 | struct inode *gfs2_ilookup(struct super_block *sb, u64 no_addr) |
| 68 | { |
| 69 | unsigned long hash = (unsigned long)no_addr; |
| 70 | return ilookup5(sb, hash, iget_test, &no_addr); |
| 71 | } |
| 72 | |
| 73 | static struct inode *gfs2_iget(struct super_block *sb, u64 no_addr) |
| 74 | { |
| 75 | unsigned long hash = (unsigned long)no_addr; |
| 76 | return iget5_locked(sb, hash, iget_test, iget_set, &no_addr); |
| 77 | } |
| 78 | |
| 79 | struct gfs2_skip_data { |
| 80 | u64 no_addr; |
| 81 | int skipped; |
| 82 | }; |
| 83 | |
| 84 | static int iget_skip_test(struct inode *inode, void *opaque) |
| 85 | { |
| 86 | struct gfs2_inode *ip = GFS2_I(inode); |
| 87 | struct gfs2_skip_data *data = opaque; |
| 88 | |
| 89 | if (ip->i_no_addr == data->no_addr && test_bit(GIF_USER, &ip->i_flags)){ |
| 90 | if (inode->i_state & (I_FREEING|I_CLEAR|I_WILL_FREE)){ |
| 91 | data->skipped = 1; |
| 92 | return 0; |
| 93 | } |
| 94 | return 1; |
| 95 | } |
| 96 | return 0; |
| 97 | } |
| 98 | |
| 99 | static int iget_skip_set(struct inode *inode, void *opaque) |
| 100 | { |
| 101 | struct gfs2_inode *ip = GFS2_I(inode); |
| 102 | struct gfs2_skip_data *data = opaque; |
| 103 | |
| 104 | if (data->skipped) |
| 105 | return 1; |
| 106 | inode->i_ino = (unsigned long)(data->no_addr); |
| 107 | ip->i_no_addr = data->no_addr; |
| 108 | set_bit(GIF_USER, &ip->i_flags); |
| 109 | return 0; |
| 110 | } |
| 111 | |
| 112 | static struct inode *gfs2_iget_skip(struct super_block *sb, |
| 113 | u64 no_addr) |
| 114 | { |
| 115 | struct gfs2_skip_data data; |
| 116 | unsigned long hash = (unsigned long)no_addr; |
| 117 | |
| 118 | data.no_addr = no_addr; |
| 119 | data.skipped = 0; |
| 120 | return iget5_locked(sb, hash, iget_skip_test, iget_skip_set, &data); |
| 121 | } |
| 122 | |
| 123 | /** |
| 124 | * GFS2 lookup code fills in vfs inode contents based on info obtained |
| 125 | * from directory entry inside gfs2_inode_lookup(). This has caused issues |
| 126 | * with NFS code path since its get_dentry routine doesn't have the relevant |
| 127 | * directory entry when gfs2_inode_lookup() is invoked. Part of the code |
| 128 | * segment inside gfs2_inode_lookup code needs to get moved around. |
| 129 | * |
| 130 | * Clean up I_LOCK and I_NEW as well. |
| 131 | **/ |
| 132 | |
| 133 | void gfs2_set_iop(struct inode *inode) |
| 134 | { |
| 135 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
| 136 | umode_t mode = inode->i_mode; |
| 137 | |
| 138 | if (S_ISREG(mode)) { |
| 139 | inode->i_op = &gfs2_file_iops; |
| 140 | if (sdp->sd_args.ar_localflocks) |
| 141 | inode->i_fop = &gfs2_file_fops_nolock; |
| 142 | else |
| 143 | inode->i_fop = &gfs2_file_fops; |
| 144 | } else if (S_ISDIR(mode)) { |
| 145 | inode->i_op = &gfs2_dir_iops; |
| 146 | if (sdp->sd_args.ar_localflocks) |
| 147 | inode->i_fop = &gfs2_dir_fops_nolock; |
| 148 | else |
| 149 | inode->i_fop = &gfs2_dir_fops; |
| 150 | } else if (S_ISLNK(mode)) { |
| 151 | inode->i_op = &gfs2_symlink_iops; |
| 152 | } else { |
| 153 | inode->i_op = &gfs2_file_iops; |
| 154 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
| 155 | } |
| 156 | |
| 157 | unlock_new_inode(inode); |
| 158 | } |
| 159 | |
| 160 | /** |
| 161 | * gfs2_inode_lookup - Lookup an inode |
| 162 | * @sb: The super block |
| 163 | * @no_addr: The inode number |
| 164 | * @type: The type of the inode |
| 165 | * @skip_freeing: set this not return an inode if it is currently being freed. |
| 166 | * |
| 167 | * Returns: A VFS inode, or an error |
| 168 | */ |
| 169 | |
| 170 | struct inode *gfs2_inode_lookup(struct super_block *sb, |
| 171 | unsigned int type, |
| 172 | u64 no_addr, |
| 173 | u64 no_formal_ino, int skip_freeing) |
| 174 | { |
| 175 | struct inode *inode; |
| 176 | struct gfs2_inode *ip; |
| 177 | struct gfs2_glock *io_gl; |
| 178 | int error; |
| 179 | |
| 180 | if (skip_freeing) |
| 181 | inode = gfs2_iget_skip(sb, no_addr); |
| 182 | else |
| 183 | inode = gfs2_iget(sb, no_addr); |
| 184 | ip = GFS2_I(inode); |
| 185 | |
| 186 | if (!inode) |
| 187 | return ERR_PTR(-ENOBUFS); |
| 188 | |
| 189 | if (inode->i_state & I_NEW) { |
| 190 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
| 191 | ip->i_no_formal_ino = no_formal_ino; |
| 192 | |
| 193 | error = gfs2_glock_get(sdp, no_addr, &gfs2_inode_glops, CREATE, &ip->i_gl); |
| 194 | if (unlikely(error)) |
| 195 | goto fail; |
| 196 | ip->i_gl->gl_object = ip; |
| 197 | |
| 198 | error = gfs2_glock_get(sdp, no_addr, &gfs2_iopen_glops, CREATE, &io_gl); |
| 199 | if (unlikely(error)) |
| 200 | goto fail_put; |
| 201 | |
| 202 | set_bit(GIF_INVALID, &ip->i_flags); |
| 203 | error = gfs2_glock_nq_init(io_gl, LM_ST_SHARED, GL_EXACT, &ip->i_iopen_gh); |
| 204 | if (unlikely(error)) |
| 205 | goto fail_iopen; |
| 206 | ip->i_iopen_gh.gh_gl->gl_object = ip; |
| 207 | |
| 208 | gfs2_glock_put(io_gl); |
| 209 | |
| 210 | if ((type == DT_UNKNOWN) && (no_formal_ino == 0)) |
| 211 | goto gfs2_nfsbypass; |
| 212 | |
| 213 | inode->i_mode = DT2IF(type); |
| 214 | |
| 215 | /* |
| 216 | * We must read the inode in order to work out its type in |
| 217 | * this case. Note that this doesn't happen often as we normally |
| 218 | * know the type beforehand. This code path only occurs during |
| 219 | * unlinked inode recovery (where it is safe to do this glock, |
| 220 | * which is not true in the general case). |
| 221 | */ |
| 222 | if (type == DT_UNKNOWN) { |
| 223 | struct gfs2_holder gh; |
| 224 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
| 225 | if (unlikely(error)) |
| 226 | goto fail_glock; |
| 227 | /* Inode is now uptodate */ |
| 228 | gfs2_glock_dq_uninit(&gh); |
| 229 | } |
| 230 | |
| 231 | gfs2_set_iop(inode); |
| 232 | } |
| 233 | |
| 234 | gfs2_nfsbypass: |
| 235 | return inode; |
| 236 | fail_glock: |
| 237 | gfs2_glock_dq(&ip->i_iopen_gh); |
| 238 | fail_iopen: |
| 239 | gfs2_glock_put(io_gl); |
| 240 | fail_put: |
| 241 | ip->i_gl->gl_object = NULL; |
| 242 | gfs2_glock_put(ip->i_gl); |
| 243 | fail: |
| 244 | iget_failed(inode); |
| 245 | return ERR_PTR(error); |
| 246 | } |
| 247 | |
| 248 | static int gfs2_dinode_in(struct gfs2_inode *ip, const void *buf) |
| 249 | { |
| 250 | const struct gfs2_dinode *str = buf; |
| 251 | struct timespec atime; |
| 252 | u16 height, depth; |
| 253 | |
| 254 | if (unlikely(ip->i_no_addr != be64_to_cpu(str->di_num.no_addr))) |
| 255 | goto corrupt; |
| 256 | ip->i_no_formal_ino = be64_to_cpu(str->di_num.no_formal_ino); |
| 257 | ip->i_inode.i_mode = be32_to_cpu(str->di_mode); |
| 258 | ip->i_inode.i_rdev = 0; |
| 259 | switch (ip->i_inode.i_mode & S_IFMT) { |
| 260 | case S_IFBLK: |
| 261 | case S_IFCHR: |
| 262 | ip->i_inode.i_rdev = MKDEV(be32_to_cpu(str->di_major), |
| 263 | be32_to_cpu(str->di_minor)); |
| 264 | break; |
| 265 | }; |
| 266 | |
| 267 | ip->i_inode.i_uid = be32_to_cpu(str->di_uid); |
| 268 | ip->i_inode.i_gid = be32_to_cpu(str->di_gid); |
| 269 | /* |
| 270 | * We will need to review setting the nlink count here in the |
| 271 | * light of the forthcoming ro bind mount work. This is a reminder |
| 272 | * to do that. |
| 273 | */ |
| 274 | ip->i_inode.i_nlink = be32_to_cpu(str->di_nlink); |
| 275 | ip->i_disksize = be64_to_cpu(str->di_size); |
| 276 | i_size_write(&ip->i_inode, ip->i_disksize); |
| 277 | gfs2_set_inode_blocks(&ip->i_inode, be64_to_cpu(str->di_blocks)); |
| 278 | atime.tv_sec = be64_to_cpu(str->di_atime); |
| 279 | atime.tv_nsec = be32_to_cpu(str->di_atime_nsec); |
| 280 | if (timespec_compare(&ip->i_inode.i_atime, &atime) < 0) |
| 281 | ip->i_inode.i_atime = atime; |
| 282 | ip->i_inode.i_mtime.tv_sec = be64_to_cpu(str->di_mtime); |
| 283 | ip->i_inode.i_mtime.tv_nsec = be32_to_cpu(str->di_mtime_nsec); |
| 284 | ip->i_inode.i_ctime.tv_sec = be64_to_cpu(str->di_ctime); |
| 285 | ip->i_inode.i_ctime.tv_nsec = be32_to_cpu(str->di_ctime_nsec); |
| 286 | |
| 287 | ip->i_goal = be64_to_cpu(str->di_goal_meta); |
| 288 | ip->i_generation = be64_to_cpu(str->di_generation); |
| 289 | |
| 290 | ip->i_diskflags = be32_to_cpu(str->di_flags); |
| 291 | gfs2_set_inode_flags(&ip->i_inode); |
| 292 | height = be16_to_cpu(str->di_height); |
| 293 | if (unlikely(height > GFS2_MAX_META_HEIGHT)) |
| 294 | goto corrupt; |
| 295 | ip->i_height = (u8)height; |
| 296 | |
| 297 | depth = be16_to_cpu(str->di_depth); |
| 298 | if (unlikely(depth > GFS2_DIR_MAX_DEPTH)) |
| 299 | goto corrupt; |
| 300 | ip->i_depth = (u8)depth; |
| 301 | ip->i_entries = be32_to_cpu(str->di_entries); |
| 302 | |
| 303 | ip->i_eattr = be64_to_cpu(str->di_eattr); |
| 304 | if (S_ISREG(ip->i_inode.i_mode)) |
| 305 | gfs2_set_aops(&ip->i_inode); |
| 306 | |
| 307 | return 0; |
| 308 | corrupt: |
| 309 | if (gfs2_consist_inode(ip)) |
| 310 | gfs2_dinode_print(ip); |
| 311 | return -EIO; |
| 312 | } |
| 313 | |
| 314 | /** |
| 315 | * gfs2_inode_refresh - Refresh the incore copy of the dinode |
| 316 | * @ip: The GFS2 inode |
| 317 | * |
| 318 | * Returns: errno |
| 319 | */ |
| 320 | |
| 321 | int gfs2_inode_refresh(struct gfs2_inode *ip) |
| 322 | { |
| 323 | struct buffer_head *dibh; |
| 324 | int error; |
| 325 | |
| 326 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 327 | if (error) |
| 328 | return error; |
| 329 | |
| 330 | if (gfs2_metatype_check(GFS2_SB(&ip->i_inode), dibh, GFS2_METATYPE_DI)) { |
| 331 | brelse(dibh); |
| 332 | return -EIO; |
| 333 | } |
| 334 | |
| 335 | error = gfs2_dinode_in(ip, dibh->b_data); |
| 336 | brelse(dibh); |
| 337 | clear_bit(GIF_INVALID, &ip->i_flags); |
| 338 | |
| 339 | return error; |
| 340 | } |
| 341 | |
| 342 | int gfs2_dinode_dealloc(struct gfs2_inode *ip) |
| 343 | { |
| 344 | struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode); |
| 345 | struct gfs2_alloc *al; |
| 346 | struct gfs2_rgrpd *rgd; |
| 347 | int error; |
| 348 | |
| 349 | if (gfs2_get_inode_blocks(&ip->i_inode) != 1) { |
| 350 | if (gfs2_consist_inode(ip)) |
| 351 | gfs2_dinode_print(ip); |
| 352 | return -EIO; |
| 353 | } |
| 354 | |
| 355 | al = gfs2_alloc_get(ip); |
| 356 | if (!al) |
| 357 | return -ENOMEM; |
| 358 | |
| 359 | error = gfs2_quota_hold(ip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); |
| 360 | if (error) |
| 361 | goto out; |
| 362 | |
| 363 | error = gfs2_rindex_hold(sdp, &al->al_ri_gh); |
| 364 | if (error) |
| 365 | goto out_qs; |
| 366 | |
| 367 | rgd = gfs2_blk2rgrpd(sdp, ip->i_no_addr); |
| 368 | if (!rgd) { |
| 369 | gfs2_consist_inode(ip); |
| 370 | error = -EIO; |
| 371 | goto out_rindex_relse; |
| 372 | } |
| 373 | |
| 374 | error = gfs2_glock_nq_init(rgd->rd_gl, LM_ST_EXCLUSIVE, 0, |
| 375 | &al->al_rgd_gh); |
| 376 | if (error) |
| 377 | goto out_rindex_relse; |
| 378 | |
| 379 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS + RES_QUOTA, 1); |
| 380 | if (error) |
| 381 | goto out_rg_gunlock; |
| 382 | |
| 383 | set_bit(GLF_DIRTY, &ip->i_gl->gl_flags); |
| 384 | set_bit(GLF_LFLUSH, &ip->i_gl->gl_flags); |
| 385 | |
| 386 | gfs2_free_di(rgd, ip); |
| 387 | |
| 388 | gfs2_trans_end(sdp); |
| 389 | |
| 390 | out_rg_gunlock: |
| 391 | gfs2_glock_dq_uninit(&al->al_rgd_gh); |
| 392 | out_rindex_relse: |
| 393 | gfs2_glock_dq_uninit(&al->al_ri_gh); |
| 394 | out_qs: |
| 395 | gfs2_quota_unhold(ip); |
| 396 | out: |
| 397 | gfs2_alloc_put(ip); |
| 398 | return error; |
| 399 | } |
| 400 | |
| 401 | /** |
| 402 | * gfs2_change_nlink - Change nlink count on inode |
| 403 | * @ip: The GFS2 inode |
| 404 | * @diff: The change in the nlink count required |
| 405 | * |
| 406 | * Returns: errno |
| 407 | */ |
| 408 | int gfs2_change_nlink(struct gfs2_inode *ip, int diff) |
| 409 | { |
| 410 | struct buffer_head *dibh; |
| 411 | u32 nlink; |
| 412 | int error; |
| 413 | |
| 414 | BUG_ON(diff != 1 && diff != -1); |
| 415 | nlink = ip->i_inode.i_nlink + diff; |
| 416 | |
| 417 | /* If we are reducing the nlink count, but the new value ends up being |
| 418 | bigger than the old one, we must have underflowed. */ |
| 419 | if (diff < 0 && nlink > ip->i_inode.i_nlink) { |
| 420 | if (gfs2_consist_inode(ip)) |
| 421 | gfs2_dinode_print(ip); |
| 422 | return -EIO; |
| 423 | } |
| 424 | |
| 425 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 426 | if (error) |
| 427 | return error; |
| 428 | |
| 429 | if (diff > 0) |
| 430 | inc_nlink(&ip->i_inode); |
| 431 | else |
| 432 | drop_nlink(&ip->i_inode); |
| 433 | |
| 434 | ip->i_inode.i_ctime = CURRENT_TIME; |
| 435 | |
| 436 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| 437 | gfs2_dinode_out(ip, dibh->b_data); |
| 438 | brelse(dibh); |
| 439 | mark_inode_dirty(&ip->i_inode); |
| 440 | |
| 441 | if (ip->i_inode.i_nlink == 0) |
| 442 | gfs2_unlink_di(&ip->i_inode); /* mark inode unlinked */ |
| 443 | |
| 444 | return error; |
| 445 | } |
| 446 | |
| 447 | struct inode *gfs2_lookup_simple(struct inode *dip, const char *name) |
| 448 | { |
| 449 | struct qstr qstr; |
| 450 | struct inode *inode; |
| 451 | gfs2_str2qstr(&qstr, name); |
| 452 | inode = gfs2_lookupi(dip, &qstr, 1); |
| 453 | /* gfs2_lookupi has inconsistent callers: vfs |
| 454 | * related routines expect NULL for no entry found, |
| 455 | * gfs2_lookup_simple callers expect ENOENT |
| 456 | * and do not check for NULL. |
| 457 | */ |
| 458 | if (inode == NULL) |
| 459 | return ERR_PTR(-ENOENT); |
| 460 | else |
| 461 | return inode; |
| 462 | } |
| 463 | |
| 464 | |
| 465 | /** |
| 466 | * gfs2_lookupi - Look up a filename in a directory and return its inode |
| 467 | * @d_gh: An initialized holder for the directory glock |
| 468 | * @name: The name of the inode to look for |
| 469 | * @is_root: If 1, ignore the caller's permissions |
| 470 | * @i_gh: An uninitialized holder for the new inode glock |
| 471 | * |
| 472 | * This can be called via the VFS filldir function when NFS is doing |
| 473 | * a readdirplus and the inode which its intending to stat isn't |
| 474 | * already in cache. In this case we must not take the directory glock |
| 475 | * again, since the readdir call will have already taken that lock. |
| 476 | * |
| 477 | * Returns: errno |
| 478 | */ |
| 479 | |
| 480 | struct inode *gfs2_lookupi(struct inode *dir, const struct qstr *name, |
| 481 | int is_root) |
| 482 | { |
| 483 | struct super_block *sb = dir->i_sb; |
| 484 | struct gfs2_inode *dip = GFS2_I(dir); |
| 485 | struct gfs2_holder d_gh; |
| 486 | int error = 0; |
| 487 | struct inode *inode = NULL; |
| 488 | int unlock = 0; |
| 489 | |
| 490 | if (!name->len || name->len > GFS2_FNAMESIZE) |
| 491 | return ERR_PTR(-ENAMETOOLONG); |
| 492 | |
| 493 | if ((name->len == 1 && memcmp(name->name, ".", 1) == 0) || |
| 494 | (name->len == 2 && memcmp(name->name, "..", 2) == 0 && |
| 495 | dir == sb->s_root->d_inode)) { |
| 496 | igrab(dir); |
| 497 | return dir; |
| 498 | } |
| 499 | |
| 500 | if (gfs2_glock_is_locked_by_me(dip->i_gl) == NULL) { |
| 501 | error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); |
| 502 | if (error) |
| 503 | return ERR_PTR(error); |
| 504 | unlock = 1; |
| 505 | } |
| 506 | |
| 507 | if (!is_root) { |
| 508 | error = gfs2_permission(dir, MAY_EXEC); |
| 509 | if (error) |
| 510 | goto out; |
| 511 | } |
| 512 | |
| 513 | inode = gfs2_dir_search(dir, name); |
| 514 | if (IS_ERR(inode)) |
| 515 | error = PTR_ERR(inode); |
| 516 | out: |
| 517 | if (unlock) |
| 518 | gfs2_glock_dq_uninit(&d_gh); |
| 519 | if (error == -ENOENT) |
| 520 | return NULL; |
| 521 | return inode ? inode : ERR_PTR(error); |
| 522 | } |
| 523 | |
| 524 | static void gfs2_inum_range_in(struct gfs2_inum_range_host *ir, const void *buf) |
| 525 | { |
| 526 | const struct gfs2_inum_range *str = buf; |
| 527 | |
| 528 | ir->ir_start = be64_to_cpu(str->ir_start); |
| 529 | ir->ir_length = be64_to_cpu(str->ir_length); |
| 530 | } |
| 531 | |
| 532 | static void gfs2_inum_range_out(const struct gfs2_inum_range_host *ir, void *buf) |
| 533 | { |
| 534 | struct gfs2_inum_range *str = buf; |
| 535 | |
| 536 | str->ir_start = cpu_to_be64(ir->ir_start); |
| 537 | str->ir_length = cpu_to_be64(ir->ir_length); |
| 538 | } |
| 539 | |
| 540 | static int pick_formal_ino_1(struct gfs2_sbd *sdp, u64 *formal_ino) |
| 541 | { |
| 542 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
| 543 | struct buffer_head *bh; |
| 544 | struct gfs2_inum_range_host ir; |
| 545 | int error; |
| 546 | |
| 547 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
| 548 | if (error) |
| 549 | return error; |
| 550 | mutex_lock(&sdp->sd_inum_mutex); |
| 551 | |
| 552 | error = gfs2_meta_inode_buffer(ip, &bh); |
| 553 | if (error) { |
| 554 | mutex_unlock(&sdp->sd_inum_mutex); |
| 555 | gfs2_trans_end(sdp); |
| 556 | return error; |
| 557 | } |
| 558 | |
| 559 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
| 560 | |
| 561 | if (ir.ir_length) { |
| 562 | *formal_ino = ir.ir_start++; |
| 563 | ir.ir_length--; |
| 564 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
| 565 | gfs2_inum_range_out(&ir, |
| 566 | bh->b_data + sizeof(struct gfs2_dinode)); |
| 567 | brelse(bh); |
| 568 | mutex_unlock(&sdp->sd_inum_mutex); |
| 569 | gfs2_trans_end(sdp); |
| 570 | return 0; |
| 571 | } |
| 572 | |
| 573 | brelse(bh); |
| 574 | |
| 575 | mutex_unlock(&sdp->sd_inum_mutex); |
| 576 | gfs2_trans_end(sdp); |
| 577 | |
| 578 | return 1; |
| 579 | } |
| 580 | |
| 581 | static int pick_formal_ino_2(struct gfs2_sbd *sdp, u64 *formal_ino) |
| 582 | { |
| 583 | struct gfs2_inode *ip = GFS2_I(sdp->sd_ir_inode); |
| 584 | struct gfs2_inode *m_ip = GFS2_I(sdp->sd_inum_inode); |
| 585 | struct gfs2_holder gh; |
| 586 | struct buffer_head *bh; |
| 587 | struct gfs2_inum_range_host ir; |
| 588 | int error; |
| 589 | |
| 590 | error = gfs2_glock_nq_init(m_ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
| 591 | if (error) |
| 592 | return error; |
| 593 | |
| 594 | error = gfs2_trans_begin(sdp, 2 * RES_DINODE, 0); |
| 595 | if (error) |
| 596 | goto out; |
| 597 | mutex_lock(&sdp->sd_inum_mutex); |
| 598 | |
| 599 | error = gfs2_meta_inode_buffer(ip, &bh); |
| 600 | if (error) |
| 601 | goto out_end_trans; |
| 602 | |
| 603 | gfs2_inum_range_in(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
| 604 | |
| 605 | if (!ir.ir_length) { |
| 606 | struct buffer_head *m_bh; |
| 607 | u64 x, y; |
| 608 | __be64 z; |
| 609 | |
| 610 | error = gfs2_meta_inode_buffer(m_ip, &m_bh); |
| 611 | if (error) |
| 612 | goto out_brelse; |
| 613 | |
| 614 | z = *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)); |
| 615 | x = y = be64_to_cpu(z); |
| 616 | ir.ir_start = x; |
| 617 | ir.ir_length = GFS2_INUM_QUANTUM; |
| 618 | x += GFS2_INUM_QUANTUM; |
| 619 | if (x < y) |
| 620 | gfs2_consist_inode(m_ip); |
| 621 | z = cpu_to_be64(x); |
| 622 | gfs2_trans_add_bh(m_ip->i_gl, m_bh, 1); |
| 623 | *(__be64 *)(m_bh->b_data + sizeof(struct gfs2_dinode)) = z; |
| 624 | |
| 625 | brelse(m_bh); |
| 626 | } |
| 627 | |
| 628 | *formal_ino = ir.ir_start++; |
| 629 | ir.ir_length--; |
| 630 | |
| 631 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
| 632 | gfs2_inum_range_out(&ir, bh->b_data + sizeof(struct gfs2_dinode)); |
| 633 | |
| 634 | out_brelse: |
| 635 | brelse(bh); |
| 636 | out_end_trans: |
| 637 | mutex_unlock(&sdp->sd_inum_mutex); |
| 638 | gfs2_trans_end(sdp); |
| 639 | out: |
| 640 | gfs2_glock_dq_uninit(&gh); |
| 641 | return error; |
| 642 | } |
| 643 | |
| 644 | static int pick_formal_ino(struct gfs2_sbd *sdp, u64 *inum) |
| 645 | { |
| 646 | int error; |
| 647 | |
| 648 | error = pick_formal_ino_1(sdp, inum); |
| 649 | if (error <= 0) |
| 650 | return error; |
| 651 | |
| 652 | error = pick_formal_ino_2(sdp, inum); |
| 653 | |
| 654 | return error; |
| 655 | } |
| 656 | |
| 657 | /** |
| 658 | * create_ok - OK to create a new on-disk inode here? |
| 659 | * @dip: Directory in which dinode is to be created |
| 660 | * @name: Name of new dinode |
| 661 | * @mode: |
| 662 | * |
| 663 | * Returns: errno |
| 664 | */ |
| 665 | |
| 666 | static int create_ok(struct gfs2_inode *dip, const struct qstr *name, |
| 667 | unsigned int mode) |
| 668 | { |
| 669 | int error; |
| 670 | |
| 671 | error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); |
| 672 | if (error) |
| 673 | return error; |
| 674 | |
| 675 | /* Don't create entries in an unlinked directory */ |
| 676 | if (!dip->i_inode.i_nlink) |
| 677 | return -EPERM; |
| 678 | |
| 679 | error = gfs2_dir_check(&dip->i_inode, name, NULL); |
| 680 | switch (error) { |
| 681 | case -ENOENT: |
| 682 | error = 0; |
| 683 | break; |
| 684 | case 0: |
| 685 | return -EEXIST; |
| 686 | default: |
| 687 | return error; |
| 688 | } |
| 689 | |
| 690 | if (dip->i_entries == (u32)-1) |
| 691 | return -EFBIG; |
| 692 | if (S_ISDIR(mode) && dip->i_inode.i_nlink == (u32)-1) |
| 693 | return -EMLINK; |
| 694 | |
| 695 | return 0; |
| 696 | } |
| 697 | |
| 698 | static void munge_mode_uid_gid(struct gfs2_inode *dip, unsigned int *mode, |
| 699 | unsigned int *uid, unsigned int *gid) |
| 700 | { |
| 701 | if (GFS2_SB(&dip->i_inode)->sd_args.ar_suiddir && |
| 702 | (dip->i_inode.i_mode & S_ISUID) && dip->i_inode.i_uid) { |
| 703 | if (S_ISDIR(*mode)) |
| 704 | *mode |= S_ISUID; |
| 705 | else if (dip->i_inode.i_uid != current_fsuid()) |
| 706 | *mode &= ~07111; |
| 707 | *uid = dip->i_inode.i_uid; |
| 708 | } else |
| 709 | *uid = current_fsuid(); |
| 710 | |
| 711 | if (dip->i_inode.i_mode & S_ISGID) { |
| 712 | if (S_ISDIR(*mode)) |
| 713 | *mode |= S_ISGID; |
| 714 | *gid = dip->i_inode.i_gid; |
| 715 | } else |
| 716 | *gid = current_fsgid(); |
| 717 | } |
| 718 | |
| 719 | static int alloc_dinode(struct gfs2_inode *dip, u64 *no_addr, u64 *generation) |
| 720 | { |
| 721 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
| 722 | int error; |
| 723 | |
| 724 | if (gfs2_alloc_get(dip) == NULL) |
| 725 | return -ENOMEM; |
| 726 | |
| 727 | dip->i_alloc->al_requested = RES_DINODE; |
| 728 | error = gfs2_inplace_reserve(dip); |
| 729 | if (error) |
| 730 | goto out; |
| 731 | |
| 732 | error = gfs2_trans_begin(sdp, RES_RG_BIT + RES_STATFS, 0); |
| 733 | if (error) |
| 734 | goto out_ipreserv; |
| 735 | |
| 736 | *no_addr = gfs2_alloc_di(dip, generation); |
| 737 | |
| 738 | gfs2_trans_end(sdp); |
| 739 | |
| 740 | out_ipreserv: |
| 741 | gfs2_inplace_release(dip); |
| 742 | out: |
| 743 | gfs2_alloc_put(dip); |
| 744 | return error; |
| 745 | } |
| 746 | |
| 747 | /** |
| 748 | * init_dinode - Fill in a new dinode structure |
| 749 | * @dip: the directory this inode is being created in |
| 750 | * @gl: The glock covering the new inode |
| 751 | * @inum: the inode number |
| 752 | * @mode: the file permissions |
| 753 | * @uid: |
| 754 | * @gid: |
| 755 | * |
| 756 | */ |
| 757 | |
| 758 | static void init_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, |
| 759 | const struct gfs2_inum_host *inum, unsigned int mode, |
| 760 | unsigned int uid, unsigned int gid, |
| 761 | const u64 *generation, dev_t dev, struct buffer_head **bhp) |
| 762 | { |
| 763 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
| 764 | struct gfs2_dinode *di; |
| 765 | struct buffer_head *dibh; |
| 766 | struct timespec tv = CURRENT_TIME; |
| 767 | |
| 768 | dibh = gfs2_meta_new(gl, inum->no_addr); |
| 769 | gfs2_trans_add_bh(gl, dibh, 1); |
| 770 | gfs2_metatype_set(dibh, GFS2_METATYPE_DI, GFS2_FORMAT_DI); |
| 771 | gfs2_buffer_clear_tail(dibh, sizeof(struct gfs2_dinode)); |
| 772 | di = (struct gfs2_dinode *)dibh->b_data; |
| 773 | |
| 774 | di->di_num.no_formal_ino = cpu_to_be64(inum->no_formal_ino); |
| 775 | di->di_num.no_addr = cpu_to_be64(inum->no_addr); |
| 776 | di->di_mode = cpu_to_be32(mode); |
| 777 | di->di_uid = cpu_to_be32(uid); |
| 778 | di->di_gid = cpu_to_be32(gid); |
| 779 | di->di_nlink = 0; |
| 780 | di->di_size = 0; |
| 781 | di->di_blocks = cpu_to_be64(1); |
| 782 | di->di_atime = di->di_mtime = di->di_ctime = cpu_to_be64(tv.tv_sec); |
| 783 | di->di_major = cpu_to_be32(MAJOR(dev)); |
| 784 | di->di_minor = cpu_to_be32(MINOR(dev)); |
| 785 | di->di_goal_meta = di->di_goal_data = cpu_to_be64(inum->no_addr); |
| 786 | di->di_generation = cpu_to_be64(*generation); |
| 787 | di->di_flags = 0; |
| 788 | |
| 789 | if (S_ISREG(mode)) { |
| 790 | if ((dip->i_diskflags & GFS2_DIF_INHERIT_JDATA) || |
| 791 | gfs2_tune_get(sdp, gt_new_files_jdata)) |
| 792 | di->di_flags |= cpu_to_be32(GFS2_DIF_JDATA); |
| 793 | } else if (S_ISDIR(mode)) { |
| 794 | di->di_flags |= cpu_to_be32(dip->i_diskflags & |
| 795 | GFS2_DIF_INHERIT_JDATA); |
| 796 | } |
| 797 | |
| 798 | di->__pad1 = 0; |
| 799 | di->di_payload_format = cpu_to_be32(S_ISDIR(mode) ? GFS2_FORMAT_DE : 0); |
| 800 | di->di_height = 0; |
| 801 | di->__pad2 = 0; |
| 802 | di->__pad3 = 0; |
| 803 | di->di_depth = 0; |
| 804 | di->di_entries = 0; |
| 805 | memset(&di->__pad4, 0, sizeof(di->__pad4)); |
| 806 | di->di_eattr = 0; |
| 807 | di->di_atime_nsec = cpu_to_be32(tv.tv_nsec); |
| 808 | di->di_mtime_nsec = cpu_to_be32(tv.tv_nsec); |
| 809 | di->di_ctime_nsec = cpu_to_be32(tv.tv_nsec); |
| 810 | memset(&di->di_reserved, 0, sizeof(di->di_reserved)); |
| 811 | |
| 812 | set_buffer_uptodate(dibh); |
| 813 | |
| 814 | *bhp = dibh; |
| 815 | } |
| 816 | |
| 817 | static int make_dinode(struct gfs2_inode *dip, struct gfs2_glock *gl, |
| 818 | unsigned int mode, const struct gfs2_inum_host *inum, |
| 819 | const u64 *generation, dev_t dev, struct buffer_head **bhp) |
| 820 | { |
| 821 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
| 822 | unsigned int uid, gid; |
| 823 | int error; |
| 824 | |
| 825 | munge_mode_uid_gid(dip, &mode, &uid, &gid); |
| 826 | if (!gfs2_alloc_get(dip)) |
| 827 | return -ENOMEM; |
| 828 | |
| 829 | error = gfs2_quota_lock(dip, uid, gid); |
| 830 | if (error) |
| 831 | goto out; |
| 832 | |
| 833 | error = gfs2_quota_check(dip, uid, gid); |
| 834 | if (error) |
| 835 | goto out_quota; |
| 836 | |
| 837 | error = gfs2_trans_begin(sdp, RES_DINODE + RES_QUOTA, 0); |
| 838 | if (error) |
| 839 | goto out_quota; |
| 840 | |
| 841 | init_dinode(dip, gl, inum, mode, uid, gid, generation, dev, bhp); |
| 842 | gfs2_quota_change(dip, +1, uid, gid); |
| 843 | gfs2_trans_end(sdp); |
| 844 | |
| 845 | out_quota: |
| 846 | gfs2_quota_unlock(dip); |
| 847 | out: |
| 848 | gfs2_alloc_put(dip); |
| 849 | return error; |
| 850 | } |
| 851 | |
| 852 | static int link_dinode(struct gfs2_inode *dip, const struct qstr *name, |
| 853 | struct gfs2_inode *ip) |
| 854 | { |
| 855 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
| 856 | struct gfs2_alloc *al; |
| 857 | int alloc_required; |
| 858 | struct buffer_head *dibh; |
| 859 | int error; |
| 860 | |
| 861 | al = gfs2_alloc_get(dip); |
| 862 | if (!al) |
| 863 | return -ENOMEM; |
| 864 | |
| 865 | error = gfs2_quota_lock(dip, NO_QUOTA_CHANGE, NO_QUOTA_CHANGE); |
| 866 | if (error) |
| 867 | goto fail; |
| 868 | |
| 869 | error = alloc_required = gfs2_diradd_alloc_required(&dip->i_inode, name); |
| 870 | if (alloc_required < 0) |
| 871 | goto fail_quota_locks; |
| 872 | if (alloc_required) { |
| 873 | error = gfs2_quota_check(dip, dip->i_inode.i_uid, dip->i_inode.i_gid); |
| 874 | if (error) |
| 875 | goto fail_quota_locks; |
| 876 | |
| 877 | al->al_requested = sdp->sd_max_dirres; |
| 878 | |
| 879 | error = gfs2_inplace_reserve(dip); |
| 880 | if (error) |
| 881 | goto fail_quota_locks; |
| 882 | |
| 883 | error = gfs2_trans_begin(sdp, sdp->sd_max_dirres + |
| 884 | al->al_rgd->rd_length + |
| 885 | 2 * RES_DINODE + |
| 886 | RES_STATFS + RES_QUOTA, 0); |
| 887 | if (error) |
| 888 | goto fail_ipreserv; |
| 889 | } else { |
| 890 | error = gfs2_trans_begin(sdp, RES_LEAF + 2 * RES_DINODE, 0); |
| 891 | if (error) |
| 892 | goto fail_quota_locks; |
| 893 | } |
| 894 | |
| 895 | error = gfs2_dir_add(&dip->i_inode, name, ip, IF2DT(ip->i_inode.i_mode)); |
| 896 | if (error) |
| 897 | goto fail_end_trans; |
| 898 | |
| 899 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 900 | if (error) |
| 901 | goto fail_end_trans; |
| 902 | ip->i_inode.i_nlink = 1; |
| 903 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| 904 | gfs2_dinode_out(ip, dibh->b_data); |
| 905 | brelse(dibh); |
| 906 | return 0; |
| 907 | |
| 908 | fail_end_trans: |
| 909 | gfs2_trans_end(sdp); |
| 910 | |
| 911 | fail_ipreserv: |
| 912 | if (dip->i_alloc->al_rgd) |
| 913 | gfs2_inplace_release(dip); |
| 914 | |
| 915 | fail_quota_locks: |
| 916 | gfs2_quota_unlock(dip); |
| 917 | |
| 918 | fail: |
| 919 | gfs2_alloc_put(dip); |
| 920 | return error; |
| 921 | } |
| 922 | |
| 923 | static int gfs2_security_init(struct gfs2_inode *dip, struct gfs2_inode *ip) |
| 924 | { |
| 925 | int err; |
| 926 | size_t len; |
| 927 | void *value; |
| 928 | char *name; |
| 929 | struct gfs2_ea_request er; |
| 930 | |
| 931 | err = security_inode_init_security(&ip->i_inode, &dip->i_inode, |
| 932 | &name, &value, &len); |
| 933 | |
| 934 | if (err) { |
| 935 | if (err == -EOPNOTSUPP) |
| 936 | return 0; |
| 937 | return err; |
| 938 | } |
| 939 | |
| 940 | memset(&er, 0, sizeof(struct gfs2_ea_request)); |
| 941 | |
| 942 | er.er_type = GFS2_EATYPE_SECURITY; |
| 943 | er.er_name = name; |
| 944 | er.er_data = value; |
| 945 | er.er_name_len = strlen(name); |
| 946 | er.er_data_len = len; |
| 947 | |
| 948 | err = gfs2_ea_set_i(ip, &er); |
| 949 | |
| 950 | kfree(value); |
| 951 | kfree(name); |
| 952 | |
| 953 | return err; |
| 954 | } |
| 955 | |
| 956 | /** |
| 957 | * gfs2_createi - Create a new inode |
| 958 | * @ghs: An array of two holders |
| 959 | * @name: The name of the new file |
| 960 | * @mode: the permissions on the new inode |
| 961 | * |
| 962 | * @ghs[0] is an initialized holder for the directory |
| 963 | * @ghs[1] is the holder for the inode lock |
| 964 | * |
| 965 | * If the return value is not NULL, the glocks on both the directory and the new |
| 966 | * file are held. A transaction has been started and an inplace reservation |
| 967 | * is held, as well. |
| 968 | * |
| 969 | * Returns: An inode |
| 970 | */ |
| 971 | |
| 972 | struct inode *gfs2_createi(struct gfs2_holder *ghs, const struct qstr *name, |
| 973 | unsigned int mode, dev_t dev) |
| 974 | { |
| 975 | struct inode *inode = NULL; |
| 976 | struct gfs2_inode *dip = ghs->gh_gl->gl_object; |
| 977 | struct inode *dir = &dip->i_inode; |
| 978 | struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); |
| 979 | struct gfs2_inum_host inum = { .no_addr = 0, .no_formal_ino = 0 }; |
| 980 | int error; |
| 981 | u64 generation; |
| 982 | struct buffer_head *bh = NULL; |
| 983 | |
| 984 | if (!name->len || name->len > GFS2_FNAMESIZE) |
| 985 | return ERR_PTR(-ENAMETOOLONG); |
| 986 | |
| 987 | gfs2_holder_reinit(LM_ST_EXCLUSIVE, 0, ghs); |
| 988 | error = gfs2_glock_nq(ghs); |
| 989 | if (error) |
| 990 | goto fail; |
| 991 | |
| 992 | error = create_ok(dip, name, mode); |
| 993 | if (error) |
| 994 | goto fail_gunlock; |
| 995 | |
| 996 | error = pick_formal_ino(sdp, &inum.no_formal_ino); |
| 997 | if (error) |
| 998 | goto fail_gunlock; |
| 999 | |
| 1000 | error = alloc_dinode(dip, &inum.no_addr, &generation); |
| 1001 | if (error) |
| 1002 | goto fail_gunlock; |
| 1003 | |
| 1004 | error = gfs2_glock_nq_num(sdp, inum.no_addr, &gfs2_inode_glops, |
| 1005 | LM_ST_EXCLUSIVE, GL_SKIP, ghs + 1); |
| 1006 | if (error) |
| 1007 | goto fail_gunlock; |
| 1008 | |
| 1009 | error = make_dinode(dip, ghs[1].gh_gl, mode, &inum, &generation, dev, &bh); |
| 1010 | if (error) |
| 1011 | goto fail_gunlock2; |
| 1012 | |
| 1013 | inode = gfs2_inode_lookup(dir->i_sb, IF2DT(mode), |
| 1014 | inum.no_addr, |
| 1015 | inum.no_formal_ino, 0); |
| 1016 | if (IS_ERR(inode)) |
| 1017 | goto fail_gunlock2; |
| 1018 | |
| 1019 | error = gfs2_inode_refresh(GFS2_I(inode)); |
| 1020 | if (error) |
| 1021 | goto fail_gunlock2; |
| 1022 | |
| 1023 | error = gfs2_acl_create(dip, GFS2_I(inode)); |
| 1024 | if (error) |
| 1025 | goto fail_gunlock2; |
| 1026 | |
| 1027 | error = gfs2_security_init(dip, GFS2_I(inode)); |
| 1028 | if (error) |
| 1029 | goto fail_gunlock2; |
| 1030 | |
| 1031 | error = link_dinode(dip, name, GFS2_I(inode)); |
| 1032 | if (error) |
| 1033 | goto fail_gunlock2; |
| 1034 | |
| 1035 | if (bh) |
| 1036 | brelse(bh); |
| 1037 | return inode; |
| 1038 | |
| 1039 | fail_gunlock2: |
| 1040 | gfs2_glock_dq_uninit(ghs + 1); |
| 1041 | if (inode && !IS_ERR(inode)) |
| 1042 | iput(inode); |
| 1043 | fail_gunlock: |
| 1044 | gfs2_glock_dq(ghs); |
| 1045 | fail: |
| 1046 | if (bh) |
| 1047 | brelse(bh); |
| 1048 | return ERR_PTR(error); |
| 1049 | } |
| 1050 | |
| 1051 | /** |
| 1052 | * gfs2_rmdiri - Remove a directory |
| 1053 | * @dip: The parent directory of the directory to be removed |
| 1054 | * @name: The name of the directory to be removed |
| 1055 | * @ip: The GFS2 inode of the directory to be removed |
| 1056 | * |
| 1057 | * Assumes Glocks on dip and ip are held |
| 1058 | * |
| 1059 | * Returns: errno |
| 1060 | */ |
| 1061 | |
| 1062 | int gfs2_rmdiri(struct gfs2_inode *dip, const struct qstr *name, |
| 1063 | struct gfs2_inode *ip) |
| 1064 | { |
| 1065 | struct qstr dotname; |
| 1066 | int error; |
| 1067 | |
| 1068 | if (ip->i_entries != 2) { |
| 1069 | if (gfs2_consist_inode(ip)) |
| 1070 | gfs2_dinode_print(ip); |
| 1071 | return -EIO; |
| 1072 | } |
| 1073 | |
| 1074 | error = gfs2_dir_del(dip, name); |
| 1075 | if (error) |
| 1076 | return error; |
| 1077 | |
| 1078 | error = gfs2_change_nlink(dip, -1); |
| 1079 | if (error) |
| 1080 | return error; |
| 1081 | |
| 1082 | gfs2_str2qstr(&dotname, "."); |
| 1083 | error = gfs2_dir_del(ip, &dotname); |
| 1084 | if (error) |
| 1085 | return error; |
| 1086 | |
| 1087 | gfs2_str2qstr(&dotname, ".."); |
| 1088 | error = gfs2_dir_del(ip, &dotname); |
| 1089 | if (error) |
| 1090 | return error; |
| 1091 | |
| 1092 | /* It looks odd, but it really should be done twice */ |
| 1093 | error = gfs2_change_nlink(ip, -1); |
| 1094 | if (error) |
| 1095 | return error; |
| 1096 | |
| 1097 | error = gfs2_change_nlink(ip, -1); |
| 1098 | if (error) |
| 1099 | return error; |
| 1100 | |
| 1101 | return error; |
| 1102 | } |
| 1103 | |
| 1104 | /* |
| 1105 | * gfs2_unlink_ok - check to see that a inode is still in a directory |
| 1106 | * @dip: the directory |
| 1107 | * @name: the name of the file |
| 1108 | * @ip: the inode |
| 1109 | * |
| 1110 | * Assumes that the lock on (at least) @dip is held. |
| 1111 | * |
| 1112 | * Returns: 0 if the parent/child relationship is correct, errno if it isn't |
| 1113 | */ |
| 1114 | |
| 1115 | int gfs2_unlink_ok(struct gfs2_inode *dip, const struct qstr *name, |
| 1116 | const struct gfs2_inode *ip) |
| 1117 | { |
| 1118 | int error; |
| 1119 | |
| 1120 | if (IS_IMMUTABLE(&ip->i_inode) || IS_APPEND(&ip->i_inode)) |
| 1121 | return -EPERM; |
| 1122 | |
| 1123 | if ((dip->i_inode.i_mode & S_ISVTX) && |
| 1124 | dip->i_inode.i_uid != current_fsuid() && |
| 1125 | ip->i_inode.i_uid != current_fsuid() && !capable(CAP_FOWNER)) |
| 1126 | return -EPERM; |
| 1127 | |
| 1128 | if (IS_APPEND(&dip->i_inode)) |
| 1129 | return -EPERM; |
| 1130 | |
| 1131 | error = gfs2_permission(&dip->i_inode, MAY_WRITE | MAY_EXEC); |
| 1132 | if (error) |
| 1133 | return error; |
| 1134 | |
| 1135 | error = gfs2_dir_check(&dip->i_inode, name, ip); |
| 1136 | if (error) |
| 1137 | return error; |
| 1138 | |
| 1139 | return 0; |
| 1140 | } |
| 1141 | |
| 1142 | /** |
| 1143 | * gfs2_readlinki - return the contents of a symlink |
| 1144 | * @ip: the symlink's inode |
| 1145 | * @buf: a pointer to the buffer to be filled |
| 1146 | * @len: a pointer to the length of @buf |
| 1147 | * |
| 1148 | * If @buf is too small, a piece of memory is kmalloc()ed and needs |
| 1149 | * to be freed by the caller. |
| 1150 | * |
| 1151 | * Returns: errno |
| 1152 | */ |
| 1153 | |
| 1154 | int gfs2_readlinki(struct gfs2_inode *ip, char **buf, unsigned int *len) |
| 1155 | { |
| 1156 | struct gfs2_holder i_gh; |
| 1157 | struct buffer_head *dibh; |
| 1158 | unsigned int x; |
| 1159 | int error; |
| 1160 | |
| 1161 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); |
| 1162 | error = gfs2_glock_nq(&i_gh); |
| 1163 | if (error) { |
| 1164 | gfs2_holder_uninit(&i_gh); |
| 1165 | return error; |
| 1166 | } |
| 1167 | |
| 1168 | if (!ip->i_disksize) { |
| 1169 | gfs2_consist_inode(ip); |
| 1170 | error = -EIO; |
| 1171 | goto out; |
| 1172 | } |
| 1173 | |
| 1174 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 1175 | if (error) |
| 1176 | goto out; |
| 1177 | |
| 1178 | x = ip->i_disksize + 1; |
| 1179 | if (x > *len) { |
| 1180 | *buf = kmalloc(x, GFP_NOFS); |
| 1181 | if (!*buf) { |
| 1182 | error = -ENOMEM; |
| 1183 | goto out_brelse; |
| 1184 | } |
| 1185 | } |
| 1186 | |
| 1187 | memcpy(*buf, dibh->b_data + sizeof(struct gfs2_dinode), x); |
| 1188 | *len = x; |
| 1189 | |
| 1190 | out_brelse: |
| 1191 | brelse(dibh); |
| 1192 | out: |
| 1193 | gfs2_glock_dq_uninit(&i_gh); |
| 1194 | return error; |
| 1195 | } |
| 1196 | |
| 1197 | static int |
| 1198 | __gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) |
| 1199 | { |
| 1200 | struct buffer_head *dibh; |
| 1201 | int error; |
| 1202 | |
| 1203 | error = gfs2_meta_inode_buffer(ip, &dibh); |
| 1204 | if (!error) { |
| 1205 | error = inode_setattr(&ip->i_inode, attr); |
| 1206 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
| 1207 | gfs2_trans_add_bh(ip->i_gl, dibh, 1); |
| 1208 | gfs2_dinode_out(ip, dibh->b_data); |
| 1209 | brelse(dibh); |
| 1210 | } |
| 1211 | return error; |
| 1212 | } |
| 1213 | |
| 1214 | /** |
| 1215 | * gfs2_setattr_simple - |
| 1216 | * @ip: |
| 1217 | * @attr: |
| 1218 | * |
| 1219 | * Called with a reference on the vnode. |
| 1220 | * |
| 1221 | * Returns: errno |
| 1222 | */ |
| 1223 | |
| 1224 | int gfs2_setattr_simple(struct gfs2_inode *ip, struct iattr *attr) |
| 1225 | { |
| 1226 | int error; |
| 1227 | |
| 1228 | if (current->journal_info) |
| 1229 | return __gfs2_setattr_simple(ip, attr); |
| 1230 | |
| 1231 | error = gfs2_trans_begin(GFS2_SB(&ip->i_inode), RES_DINODE, 0); |
| 1232 | if (error) |
| 1233 | return error; |
| 1234 | |
| 1235 | error = __gfs2_setattr_simple(ip, attr); |
| 1236 | gfs2_trans_end(GFS2_SB(&ip->i_inode)); |
| 1237 | return error; |
| 1238 | } |
| 1239 | |
| 1240 | void gfs2_dinode_out(const struct gfs2_inode *ip, void *buf) |
| 1241 | { |
| 1242 | struct gfs2_dinode *str = buf; |
| 1243 | |
| 1244 | str->di_header.mh_magic = cpu_to_be32(GFS2_MAGIC); |
| 1245 | str->di_header.mh_type = cpu_to_be32(GFS2_METATYPE_DI); |
| 1246 | str->di_header.__pad0 = 0; |
| 1247 | str->di_header.mh_format = cpu_to_be32(GFS2_FORMAT_DI); |
| 1248 | str->di_header.__pad1 = 0; |
| 1249 | str->di_num.no_addr = cpu_to_be64(ip->i_no_addr); |
| 1250 | str->di_num.no_formal_ino = cpu_to_be64(ip->i_no_formal_ino); |
| 1251 | str->di_mode = cpu_to_be32(ip->i_inode.i_mode); |
| 1252 | str->di_uid = cpu_to_be32(ip->i_inode.i_uid); |
| 1253 | str->di_gid = cpu_to_be32(ip->i_inode.i_gid); |
| 1254 | str->di_nlink = cpu_to_be32(ip->i_inode.i_nlink); |
| 1255 | str->di_size = cpu_to_be64(ip->i_disksize); |
| 1256 | str->di_blocks = cpu_to_be64(gfs2_get_inode_blocks(&ip->i_inode)); |
| 1257 | str->di_atime = cpu_to_be64(ip->i_inode.i_atime.tv_sec); |
| 1258 | str->di_mtime = cpu_to_be64(ip->i_inode.i_mtime.tv_sec); |
| 1259 | str->di_ctime = cpu_to_be64(ip->i_inode.i_ctime.tv_sec); |
| 1260 | |
| 1261 | str->di_goal_meta = cpu_to_be64(ip->i_goal); |
| 1262 | str->di_goal_data = cpu_to_be64(ip->i_goal); |
| 1263 | str->di_generation = cpu_to_be64(ip->i_generation); |
| 1264 | |
| 1265 | str->di_flags = cpu_to_be32(ip->i_diskflags); |
| 1266 | str->di_height = cpu_to_be16(ip->i_height); |
| 1267 | str->di_payload_format = cpu_to_be32(S_ISDIR(ip->i_inode.i_mode) && |
| 1268 | !(ip->i_diskflags & GFS2_DIF_EXHASH) ? |
| 1269 | GFS2_FORMAT_DE : 0); |
| 1270 | str->di_depth = cpu_to_be16(ip->i_depth); |
| 1271 | str->di_entries = cpu_to_be32(ip->i_entries); |
| 1272 | |
| 1273 | str->di_eattr = cpu_to_be64(ip->i_eattr); |
| 1274 | str->di_atime_nsec = cpu_to_be32(ip->i_inode.i_atime.tv_nsec); |
| 1275 | str->di_mtime_nsec = cpu_to_be32(ip->i_inode.i_mtime.tv_nsec); |
| 1276 | str->di_ctime_nsec = cpu_to_be32(ip->i_inode.i_ctime.tv_nsec); |
| 1277 | } |
| 1278 | |
| 1279 | void gfs2_dinode_print(const struct gfs2_inode *ip) |
| 1280 | { |
| 1281 | printk(KERN_INFO " no_formal_ino = %llu\n", |
| 1282 | (unsigned long long)ip->i_no_formal_ino); |
| 1283 | printk(KERN_INFO " no_addr = %llu\n", |
| 1284 | (unsigned long long)ip->i_no_addr); |
| 1285 | printk(KERN_INFO " i_disksize = %llu\n", |
| 1286 | (unsigned long long)ip->i_disksize); |
| 1287 | printk(KERN_INFO " blocks = %llu\n", |
| 1288 | (unsigned long long)gfs2_get_inode_blocks(&ip->i_inode)); |
| 1289 | printk(KERN_INFO " i_goal = %llu\n", |
| 1290 | (unsigned long long)ip->i_goal); |
| 1291 | printk(KERN_INFO " i_diskflags = 0x%.8X\n", ip->i_diskflags); |
| 1292 | printk(KERN_INFO " i_height = %u\n", ip->i_height); |
| 1293 | printk(KERN_INFO " i_depth = %u\n", ip->i_depth); |
| 1294 | printk(KERN_INFO " i_entries = %u\n", ip->i_entries); |
| 1295 | printk(KERN_INFO " i_eattr = %llu\n", |
| 1296 | (unsigned long long)ip->i_eattr); |
| 1297 | } |
| 1298 | |