| 1 | /* |
| 2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
| 3 | * Copyright (C) 2004-2006 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/slab.h> |
| 11 | #include <linux/spinlock.h> |
| 12 | #include <linux/completion.h> |
| 13 | #include <linux/buffer_head.h> |
| 14 | #include <linux/pagemap.h> |
| 15 | #include <linux/uio.h> |
| 16 | #include <linux/blkdev.h> |
| 17 | #include <linux/mm.h> |
| 18 | #include <linux/mount.h> |
| 19 | #include <linux/fs.h> |
| 20 | #include <linux/gfs2_ondisk.h> |
| 21 | #include <linux/ext2_fs.h> |
| 22 | #include <linux/crc32.h> |
| 23 | #include <linux/lm_interface.h> |
| 24 | #include <linux/writeback.h> |
| 25 | #include <asm/uaccess.h> |
| 26 | |
| 27 | #include "gfs2.h" |
| 28 | #include "incore.h" |
| 29 | #include "bmap.h" |
| 30 | #include "dir.h" |
| 31 | #include "glock.h" |
| 32 | #include "glops.h" |
| 33 | #include "inode.h" |
| 34 | #include "log.h" |
| 35 | #include "meta_io.h" |
| 36 | #include "quota.h" |
| 37 | #include "rgrp.h" |
| 38 | #include "trans.h" |
| 39 | #include "util.h" |
| 40 | #include "eaops.h" |
| 41 | #include "ops_address.h" |
| 42 | |
| 43 | /** |
| 44 | * gfs2_llseek - seek to a location in a file |
| 45 | * @file: the file |
| 46 | * @offset: the offset |
| 47 | * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END) |
| 48 | * |
| 49 | * SEEK_END requires the glock for the file because it references the |
| 50 | * file's size. |
| 51 | * |
| 52 | * Returns: The new offset, or errno |
| 53 | */ |
| 54 | |
| 55 | static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin) |
| 56 | { |
| 57 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
| 58 | struct gfs2_holder i_gh; |
| 59 | loff_t error; |
| 60 | |
| 61 | if (origin == 2) { |
| 62 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
| 63 | &i_gh); |
| 64 | if (!error) { |
| 65 | error = generic_file_llseek_unlocked(file, offset, origin); |
| 66 | gfs2_glock_dq_uninit(&i_gh); |
| 67 | } |
| 68 | } else |
| 69 | error = generic_file_llseek_unlocked(file, offset, origin); |
| 70 | |
| 71 | return error; |
| 72 | } |
| 73 | |
| 74 | /** |
| 75 | * gfs2_readdir - Read directory entries from a directory |
| 76 | * @file: The directory to read from |
| 77 | * @dirent: Buffer for dirents |
| 78 | * @filldir: Function used to do the copying |
| 79 | * |
| 80 | * Returns: errno |
| 81 | */ |
| 82 | |
| 83 | static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir) |
| 84 | { |
| 85 | struct inode *dir = file->f_mapping->host; |
| 86 | struct gfs2_inode *dip = GFS2_I(dir); |
| 87 | struct gfs2_holder d_gh; |
| 88 | u64 offset = file->f_pos; |
| 89 | int error; |
| 90 | |
| 91 | gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); |
| 92 | error = gfs2_glock_nq(&d_gh); |
| 93 | if (error) { |
| 94 | gfs2_holder_uninit(&d_gh); |
| 95 | return error; |
| 96 | } |
| 97 | |
| 98 | error = gfs2_dir_read(dir, &offset, dirent, filldir); |
| 99 | |
| 100 | gfs2_glock_dq_uninit(&d_gh); |
| 101 | |
| 102 | file->f_pos = offset; |
| 103 | |
| 104 | return error; |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * fsflags_cvt |
| 109 | * @table: A table of 32 u32 flags |
| 110 | * @val: a 32 bit value to convert |
| 111 | * |
| 112 | * This function can be used to convert between fsflags values and |
| 113 | * GFS2's own flags values. |
| 114 | * |
| 115 | * Returns: the converted flags |
| 116 | */ |
| 117 | static u32 fsflags_cvt(const u32 *table, u32 val) |
| 118 | { |
| 119 | u32 res = 0; |
| 120 | while(val) { |
| 121 | if (val & 1) |
| 122 | res |= *table; |
| 123 | table++; |
| 124 | val >>= 1; |
| 125 | } |
| 126 | return res; |
| 127 | } |
| 128 | |
| 129 | static const u32 fsflags_to_gfs2[32] = { |
| 130 | [3] = GFS2_DIF_SYNC, |
| 131 | [4] = GFS2_DIF_IMMUTABLE, |
| 132 | [5] = GFS2_DIF_APPENDONLY, |
| 133 | [7] = GFS2_DIF_NOATIME, |
| 134 | [12] = GFS2_DIF_EXHASH, |
| 135 | [14] = GFS2_DIF_INHERIT_JDATA, |
| 136 | }; |
| 137 | |
| 138 | static const u32 gfs2_to_fsflags[32] = { |
| 139 | [gfs2fl_Sync] = FS_SYNC_FL, |
| 140 | [gfs2fl_Immutable] = FS_IMMUTABLE_FL, |
| 141 | [gfs2fl_AppendOnly] = FS_APPEND_FL, |
| 142 | [gfs2fl_NoAtime] = FS_NOATIME_FL, |
| 143 | [gfs2fl_ExHash] = FS_INDEX_FL, |
| 144 | [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL, |
| 145 | }; |
| 146 | |
| 147 | static int gfs2_get_flags(struct file *filp, u32 __user *ptr) |
| 148 | { |
| 149 | struct inode *inode = filp->f_path.dentry->d_inode; |
| 150 | struct gfs2_inode *ip = GFS2_I(inode); |
| 151 | struct gfs2_holder gh; |
| 152 | int error; |
| 153 | u32 fsflags; |
| 154 | |
| 155 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
| 156 | error = gfs2_glock_nq(&gh); |
| 157 | if (error) |
| 158 | return error; |
| 159 | |
| 160 | fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags); |
| 161 | if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA) |
| 162 | fsflags |= FS_JOURNAL_DATA_FL; |
| 163 | if (put_user(fsflags, ptr)) |
| 164 | error = -EFAULT; |
| 165 | |
| 166 | gfs2_glock_dq(&gh); |
| 167 | gfs2_holder_uninit(&gh); |
| 168 | return error; |
| 169 | } |
| 170 | |
| 171 | void gfs2_set_inode_flags(struct inode *inode) |
| 172 | { |
| 173 | struct gfs2_inode *ip = GFS2_I(inode); |
| 174 | unsigned int flags = inode->i_flags; |
| 175 | |
| 176 | flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); |
| 177 | if (ip->i_diskflags & GFS2_DIF_IMMUTABLE) |
| 178 | flags |= S_IMMUTABLE; |
| 179 | if (ip->i_diskflags & GFS2_DIF_APPENDONLY) |
| 180 | flags |= S_APPEND; |
| 181 | if (ip->i_diskflags & GFS2_DIF_NOATIME) |
| 182 | flags |= S_NOATIME; |
| 183 | if (ip->i_diskflags & GFS2_DIF_SYNC) |
| 184 | flags |= S_SYNC; |
| 185 | inode->i_flags = flags; |
| 186 | } |
| 187 | |
| 188 | /* Flags that can be set by user space */ |
| 189 | #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ |
| 190 | GFS2_DIF_IMMUTABLE| \ |
| 191 | GFS2_DIF_APPENDONLY| \ |
| 192 | GFS2_DIF_NOATIME| \ |
| 193 | GFS2_DIF_SYNC| \ |
| 194 | GFS2_DIF_SYSTEM| \ |
| 195 | GFS2_DIF_INHERIT_JDATA) |
| 196 | |
| 197 | /** |
| 198 | * gfs2_set_flags - set flags on an inode |
| 199 | * @inode: The inode |
| 200 | * @flags: The flags to set |
| 201 | * @mask: Indicates which flags are valid |
| 202 | * |
| 203 | */ |
| 204 | static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) |
| 205 | { |
| 206 | struct inode *inode = filp->f_path.dentry->d_inode; |
| 207 | struct gfs2_inode *ip = GFS2_I(inode); |
| 208 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
| 209 | struct buffer_head *bh; |
| 210 | struct gfs2_holder gh; |
| 211 | int error; |
| 212 | u32 new_flags, flags; |
| 213 | |
| 214 | error = mnt_want_write(filp->f_path.mnt); |
| 215 | if (error) |
| 216 | return error; |
| 217 | |
| 218 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
| 219 | if (error) |
| 220 | goto out_drop_write; |
| 221 | |
| 222 | flags = ip->i_diskflags; |
| 223 | new_flags = (flags & ~mask) | (reqflags & mask); |
| 224 | if ((new_flags ^ flags) == 0) |
| 225 | goto out; |
| 226 | |
| 227 | error = -EINVAL; |
| 228 | if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET) |
| 229 | goto out; |
| 230 | |
| 231 | error = -EPERM; |
| 232 | if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE)) |
| 233 | goto out; |
| 234 | if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY)) |
| 235 | goto out; |
| 236 | if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && |
| 237 | !capable(CAP_LINUX_IMMUTABLE)) |
| 238 | goto out; |
| 239 | if (!IS_IMMUTABLE(inode)) { |
| 240 | error = gfs2_permission(inode, MAY_WRITE); |
| 241 | if (error) |
| 242 | goto out; |
| 243 | } |
| 244 | if ((flags ^ new_flags) & GFS2_DIF_JDATA) { |
| 245 | if (flags & GFS2_DIF_JDATA) |
| 246 | gfs2_log_flush(sdp, ip->i_gl); |
| 247 | error = filemap_fdatawrite(inode->i_mapping); |
| 248 | if (error) |
| 249 | goto out; |
| 250 | error = filemap_fdatawait(inode->i_mapping); |
| 251 | if (error) |
| 252 | goto out; |
| 253 | } |
| 254 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
| 255 | if (error) |
| 256 | goto out; |
| 257 | error = gfs2_meta_inode_buffer(ip, &bh); |
| 258 | if (error) |
| 259 | goto out_trans_end; |
| 260 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
| 261 | ip->i_diskflags = new_flags; |
| 262 | gfs2_dinode_out(ip, bh->b_data); |
| 263 | brelse(bh); |
| 264 | gfs2_set_inode_flags(inode); |
| 265 | gfs2_set_aops(inode); |
| 266 | out_trans_end: |
| 267 | gfs2_trans_end(sdp); |
| 268 | out: |
| 269 | gfs2_glock_dq_uninit(&gh); |
| 270 | out_drop_write: |
| 271 | mnt_drop_write(filp->f_path.mnt); |
| 272 | return error; |
| 273 | } |
| 274 | |
| 275 | static int gfs2_set_flags(struct file *filp, u32 __user *ptr) |
| 276 | { |
| 277 | struct inode *inode = filp->f_path.dentry->d_inode; |
| 278 | u32 fsflags, gfsflags; |
| 279 | if (get_user(fsflags, ptr)) |
| 280 | return -EFAULT; |
| 281 | gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags); |
| 282 | if (!S_ISDIR(inode->i_mode)) { |
| 283 | if (gfsflags & GFS2_DIF_INHERIT_JDATA) |
| 284 | gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA); |
| 285 | return do_gfs2_set_flags(filp, gfsflags, ~0); |
| 286 | } |
| 287 | return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA); |
| 288 | } |
| 289 | |
| 290 | static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
| 291 | { |
| 292 | switch(cmd) { |
| 293 | case FS_IOC_GETFLAGS: |
| 294 | return gfs2_get_flags(filp, (u32 __user *)arg); |
| 295 | case FS_IOC_SETFLAGS: |
| 296 | return gfs2_set_flags(filp, (u32 __user *)arg); |
| 297 | } |
| 298 | return -ENOTTY; |
| 299 | } |
| 300 | |
| 301 | /** |
| 302 | * gfs2_allocate_page_backing - Use bmap to allocate blocks |
| 303 | * @page: The (locked) page to allocate backing for |
| 304 | * |
| 305 | * We try to allocate all the blocks required for the page in |
| 306 | * one go. This might fail for various reasons, so we keep |
| 307 | * trying until all the blocks to back this page are allocated. |
| 308 | * If some of the blocks are already allocated, thats ok too. |
| 309 | */ |
| 310 | |
| 311 | static int gfs2_allocate_page_backing(struct page *page) |
| 312 | { |
| 313 | struct inode *inode = page->mapping->host; |
| 314 | struct buffer_head bh; |
| 315 | unsigned long size = PAGE_CACHE_SIZE; |
| 316 | u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits); |
| 317 | |
| 318 | do { |
| 319 | bh.b_state = 0; |
| 320 | bh.b_size = size; |
| 321 | gfs2_block_map(inode, lblock, &bh, 1); |
| 322 | if (!buffer_mapped(&bh)) |
| 323 | return -EIO; |
| 324 | size -= bh.b_size; |
| 325 | lblock += (bh.b_size >> inode->i_blkbits); |
| 326 | } while(size > 0); |
| 327 | return 0; |
| 328 | } |
| 329 | |
| 330 | /** |
| 331 | * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable |
| 332 | * @vma: The virtual memory area |
| 333 | * @page: The page which is about to become writable |
| 334 | * |
| 335 | * When the page becomes writable, we need to ensure that we have |
| 336 | * blocks allocated on disk to back that page. |
| 337 | */ |
| 338 | |
| 339 | static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct page *page) |
| 340 | { |
| 341 | struct inode *inode = vma->vm_file->f_path.dentry->d_inode; |
| 342 | struct gfs2_inode *ip = GFS2_I(inode); |
| 343 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
| 344 | unsigned long last_index; |
| 345 | u64 pos = page->index << PAGE_CACHE_SHIFT; |
| 346 | unsigned int data_blocks, ind_blocks, rblocks; |
| 347 | int alloc_required = 0; |
| 348 | struct gfs2_holder gh; |
| 349 | struct gfs2_alloc *al; |
| 350 | int ret; |
| 351 | |
| 352 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
| 353 | ret = gfs2_glock_nq(&gh); |
| 354 | if (ret) |
| 355 | goto out; |
| 356 | |
| 357 | set_bit(GIF_SW_PAGED, &ip->i_flags); |
| 358 | ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required); |
| 359 | if (ret || !alloc_required) |
| 360 | goto out_unlock; |
| 361 | ret = -ENOMEM; |
| 362 | al = gfs2_alloc_get(ip); |
| 363 | if (al == NULL) |
| 364 | goto out_unlock; |
| 365 | |
| 366 | ret = gfs2_quota_lock_check(ip); |
| 367 | if (ret) |
| 368 | goto out_alloc_put; |
| 369 | gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks); |
| 370 | al->al_requested = data_blocks + ind_blocks; |
| 371 | ret = gfs2_inplace_reserve(ip); |
| 372 | if (ret) |
| 373 | goto out_quota_unlock; |
| 374 | |
| 375 | rblocks = RES_DINODE + ind_blocks; |
| 376 | if (gfs2_is_jdata(ip)) |
| 377 | rblocks += data_blocks ? data_blocks : 1; |
| 378 | if (ind_blocks || data_blocks) |
| 379 | rblocks += RES_STATFS + RES_QUOTA; |
| 380 | ret = gfs2_trans_begin(sdp, rblocks, 0); |
| 381 | if (ret) |
| 382 | goto out_trans_fail; |
| 383 | |
| 384 | lock_page(page); |
| 385 | ret = -EINVAL; |
| 386 | last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT; |
| 387 | if (page->index > last_index) |
| 388 | goto out_unlock_page; |
| 389 | ret = 0; |
| 390 | if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping) |
| 391 | goto out_unlock_page; |
| 392 | if (gfs2_is_stuffed(ip)) { |
| 393 | ret = gfs2_unstuff_dinode(ip, page); |
| 394 | if (ret) |
| 395 | goto out_unlock_page; |
| 396 | } |
| 397 | ret = gfs2_allocate_page_backing(page); |
| 398 | |
| 399 | out_unlock_page: |
| 400 | unlock_page(page); |
| 401 | gfs2_trans_end(sdp); |
| 402 | out_trans_fail: |
| 403 | gfs2_inplace_release(ip); |
| 404 | out_quota_unlock: |
| 405 | gfs2_quota_unlock(ip); |
| 406 | out_alloc_put: |
| 407 | gfs2_alloc_put(ip); |
| 408 | out_unlock: |
| 409 | gfs2_glock_dq(&gh); |
| 410 | out: |
| 411 | gfs2_holder_uninit(&gh); |
| 412 | return ret; |
| 413 | } |
| 414 | |
| 415 | static struct vm_operations_struct gfs2_vm_ops = { |
| 416 | .fault = filemap_fault, |
| 417 | .page_mkwrite = gfs2_page_mkwrite, |
| 418 | }; |
| 419 | |
| 420 | |
| 421 | /** |
| 422 | * gfs2_mmap - |
| 423 | * @file: The file to map |
| 424 | * @vma: The VMA which described the mapping |
| 425 | * |
| 426 | * Returns: 0 or error code |
| 427 | */ |
| 428 | |
| 429 | static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) |
| 430 | { |
| 431 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
| 432 | struct gfs2_holder i_gh; |
| 433 | int error; |
| 434 | |
| 435 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh); |
| 436 | error = gfs2_glock_nq(&i_gh); |
| 437 | if (error) { |
| 438 | gfs2_holder_uninit(&i_gh); |
| 439 | return error; |
| 440 | } |
| 441 | |
| 442 | vma->vm_ops = &gfs2_vm_ops; |
| 443 | |
| 444 | gfs2_glock_dq_uninit(&i_gh); |
| 445 | |
| 446 | return error; |
| 447 | } |
| 448 | |
| 449 | /** |
| 450 | * gfs2_open - open a file |
| 451 | * @inode: the inode to open |
| 452 | * @file: the struct file for this opening |
| 453 | * |
| 454 | * Returns: errno |
| 455 | */ |
| 456 | |
| 457 | static int gfs2_open(struct inode *inode, struct file *file) |
| 458 | { |
| 459 | struct gfs2_inode *ip = GFS2_I(inode); |
| 460 | struct gfs2_holder i_gh; |
| 461 | struct gfs2_file *fp; |
| 462 | int error; |
| 463 | |
| 464 | fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); |
| 465 | if (!fp) |
| 466 | return -ENOMEM; |
| 467 | |
| 468 | mutex_init(&fp->f_fl_mutex); |
| 469 | |
| 470 | gfs2_assert_warn(GFS2_SB(inode), !file->private_data); |
| 471 | file->private_data = fp; |
| 472 | |
| 473 | if (S_ISREG(ip->i_inode.i_mode)) { |
| 474 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, |
| 475 | &i_gh); |
| 476 | if (error) |
| 477 | goto fail; |
| 478 | |
| 479 | if (!(file->f_flags & O_LARGEFILE) && |
| 480 | ip->i_disksize > MAX_NON_LFS) { |
| 481 | error = -EOVERFLOW; |
| 482 | goto fail_gunlock; |
| 483 | } |
| 484 | |
| 485 | gfs2_glock_dq_uninit(&i_gh); |
| 486 | } |
| 487 | |
| 488 | return 0; |
| 489 | |
| 490 | fail_gunlock: |
| 491 | gfs2_glock_dq_uninit(&i_gh); |
| 492 | fail: |
| 493 | file->private_data = NULL; |
| 494 | kfree(fp); |
| 495 | return error; |
| 496 | } |
| 497 | |
| 498 | /** |
| 499 | * gfs2_close - called to close a struct file |
| 500 | * @inode: the inode the struct file belongs to |
| 501 | * @file: the struct file being closed |
| 502 | * |
| 503 | * Returns: errno |
| 504 | */ |
| 505 | |
| 506 | static int gfs2_close(struct inode *inode, struct file *file) |
| 507 | { |
| 508 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; |
| 509 | struct gfs2_file *fp; |
| 510 | |
| 511 | fp = file->private_data; |
| 512 | file->private_data = NULL; |
| 513 | |
| 514 | if (gfs2_assert_warn(sdp, fp)) |
| 515 | return -EIO; |
| 516 | |
| 517 | kfree(fp); |
| 518 | |
| 519 | return 0; |
| 520 | } |
| 521 | |
| 522 | /** |
| 523 | * gfs2_fsync - sync the dirty data for a file (across the cluster) |
| 524 | * @file: the file that points to the dentry (we ignore this) |
| 525 | * @dentry: the dentry that points to the inode to sync |
| 526 | * |
| 527 | * The VFS will flush "normal" data for us. We only need to worry |
| 528 | * about metadata here. For journaled data, we just do a log flush |
| 529 | * as we can't avoid it. Otherwise we can just bale out if datasync |
| 530 | * is set. For stuffed inodes we must flush the log in order to |
| 531 | * ensure that all data is on disk. |
| 532 | * |
| 533 | * The call to write_inode_now() is there to write back metadata and |
| 534 | * the inode itself. It does also try and write the data, but thats |
| 535 | * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite() |
| 536 | * for us. |
| 537 | * |
| 538 | * Returns: errno |
| 539 | */ |
| 540 | |
| 541 | static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync) |
| 542 | { |
| 543 | struct inode *inode = dentry->d_inode; |
| 544 | int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC); |
| 545 | int ret = 0; |
| 546 | |
| 547 | if (gfs2_is_jdata(GFS2_I(inode))) { |
| 548 | gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); |
| 549 | return 0; |
| 550 | } |
| 551 | |
| 552 | if (sync_state != 0) { |
| 553 | if (!datasync) |
| 554 | ret = write_inode_now(inode, 0); |
| 555 | |
| 556 | if (gfs2_is_stuffed(GFS2_I(inode))) |
| 557 | gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl); |
| 558 | } |
| 559 | |
| 560 | return ret; |
| 561 | } |
| 562 | |
| 563 | /** |
| 564 | * gfs2_setlease - acquire/release a file lease |
| 565 | * @file: the file pointer |
| 566 | * @arg: lease type |
| 567 | * @fl: file lock |
| 568 | * |
| 569 | * Returns: errno |
| 570 | */ |
| 571 | |
| 572 | static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl) |
| 573 | { |
| 574 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); |
| 575 | |
| 576 | /* |
| 577 | * We don't currently have a way to enforce a lease across the whole |
| 578 | * cluster; until we do, disable leases (by just returning -EINVAL), |
| 579 | * unless the administrator has requested purely local locking. |
| 580 | */ |
| 581 | if (!sdp->sd_args.ar_localflocks) |
| 582 | return -EINVAL; |
| 583 | return generic_setlease(file, arg, fl); |
| 584 | } |
| 585 | |
| 586 | static int gfs2_lm_plock_get(struct gfs2_sbd *sdp, struct lm_lockname *name, |
| 587 | struct file *file, struct file_lock *fl) |
| 588 | { |
| 589 | int error = -EIO; |
| 590 | if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
| 591 | error = sdp->sd_lockstruct.ls_ops->lm_plock_get( |
| 592 | sdp->sd_lockstruct.ls_lockspace, name, file, fl); |
| 593 | return error; |
| 594 | } |
| 595 | |
| 596 | static int gfs2_lm_plock(struct gfs2_sbd *sdp, struct lm_lockname *name, |
| 597 | struct file *file, int cmd, struct file_lock *fl) |
| 598 | { |
| 599 | int error = -EIO; |
| 600 | if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
| 601 | error = sdp->sd_lockstruct.ls_ops->lm_plock( |
| 602 | sdp->sd_lockstruct.ls_lockspace, name, file, cmd, fl); |
| 603 | return error; |
| 604 | } |
| 605 | |
| 606 | static int gfs2_lm_punlock(struct gfs2_sbd *sdp, struct lm_lockname *name, |
| 607 | struct file *file, struct file_lock *fl) |
| 608 | { |
| 609 | int error = -EIO; |
| 610 | if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
| 611 | error = sdp->sd_lockstruct.ls_ops->lm_punlock( |
| 612 | sdp->sd_lockstruct.ls_lockspace, name, file, fl); |
| 613 | return error; |
| 614 | } |
| 615 | |
| 616 | /** |
| 617 | * gfs2_lock - acquire/release a posix lock on a file |
| 618 | * @file: the file pointer |
| 619 | * @cmd: either modify or retrieve lock state, possibly wait |
| 620 | * @fl: type and range of lock |
| 621 | * |
| 622 | * Returns: errno |
| 623 | */ |
| 624 | |
| 625 | static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) |
| 626 | { |
| 627 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
| 628 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); |
| 629 | struct lm_lockname name = |
| 630 | { .ln_number = ip->i_no_addr, |
| 631 | .ln_type = LM_TYPE_PLOCK }; |
| 632 | |
| 633 | if (!(fl->fl_flags & FL_POSIX)) |
| 634 | return -ENOLCK; |
| 635 | if (__mandatory_lock(&ip->i_inode)) |
| 636 | return -ENOLCK; |
| 637 | |
| 638 | if (cmd == F_CANCELLK) { |
| 639 | /* Hack: */ |
| 640 | cmd = F_SETLK; |
| 641 | fl->fl_type = F_UNLCK; |
| 642 | } |
| 643 | if (IS_GETLK(cmd)) |
| 644 | return gfs2_lm_plock_get(sdp, &name, file, fl); |
| 645 | else if (fl->fl_type == F_UNLCK) |
| 646 | return gfs2_lm_punlock(sdp, &name, file, fl); |
| 647 | else |
| 648 | return gfs2_lm_plock(sdp, &name, file, cmd, fl); |
| 649 | } |
| 650 | |
| 651 | static int do_flock(struct file *file, int cmd, struct file_lock *fl) |
| 652 | { |
| 653 | struct gfs2_file *fp = file->private_data; |
| 654 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
| 655 | struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode); |
| 656 | struct gfs2_glock *gl; |
| 657 | unsigned int state; |
| 658 | int flags; |
| 659 | int error = 0; |
| 660 | |
| 661 | state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED; |
| 662 | flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE; |
| 663 | |
| 664 | mutex_lock(&fp->f_fl_mutex); |
| 665 | |
| 666 | gl = fl_gh->gh_gl; |
| 667 | if (gl) { |
| 668 | if (fl_gh->gh_state == state) |
| 669 | goto out; |
| 670 | flock_lock_file_wait(file, |
| 671 | &(struct file_lock){.fl_type = F_UNLCK}); |
| 672 | gfs2_glock_dq_wait(fl_gh); |
| 673 | gfs2_holder_reinit(state, flags, fl_gh); |
| 674 | } else { |
| 675 | error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr, |
| 676 | &gfs2_flock_glops, CREATE, &gl); |
| 677 | if (error) |
| 678 | goto out; |
| 679 | gfs2_holder_init(gl, state, flags, fl_gh); |
| 680 | gfs2_glock_put(gl); |
| 681 | } |
| 682 | error = gfs2_glock_nq(fl_gh); |
| 683 | if (error) { |
| 684 | gfs2_holder_uninit(fl_gh); |
| 685 | if (error == GLR_TRYFAILED) |
| 686 | error = -EAGAIN; |
| 687 | } else { |
| 688 | error = flock_lock_file_wait(file, fl); |
| 689 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
| 690 | } |
| 691 | |
| 692 | out: |
| 693 | mutex_unlock(&fp->f_fl_mutex); |
| 694 | return error; |
| 695 | } |
| 696 | |
| 697 | static void do_unflock(struct file *file, struct file_lock *fl) |
| 698 | { |
| 699 | struct gfs2_file *fp = file->private_data; |
| 700 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
| 701 | |
| 702 | mutex_lock(&fp->f_fl_mutex); |
| 703 | flock_lock_file_wait(file, fl); |
| 704 | if (fl_gh->gh_gl) |
| 705 | gfs2_glock_dq_uninit(fl_gh); |
| 706 | mutex_unlock(&fp->f_fl_mutex); |
| 707 | } |
| 708 | |
| 709 | /** |
| 710 | * gfs2_flock - acquire/release a flock lock on a file |
| 711 | * @file: the file pointer |
| 712 | * @cmd: either modify or retrieve lock state, possibly wait |
| 713 | * @fl: type and range of lock |
| 714 | * |
| 715 | * Returns: errno |
| 716 | */ |
| 717 | |
| 718 | static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) |
| 719 | { |
| 720 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
| 721 | |
| 722 | if (!(fl->fl_flags & FL_FLOCK)) |
| 723 | return -ENOLCK; |
| 724 | if (__mandatory_lock(&ip->i_inode)) |
| 725 | return -ENOLCK; |
| 726 | |
| 727 | if (fl->fl_type == F_UNLCK) { |
| 728 | do_unflock(file, fl); |
| 729 | return 0; |
| 730 | } else { |
| 731 | return do_flock(file, cmd, fl); |
| 732 | } |
| 733 | } |
| 734 | |
| 735 | const struct file_operations gfs2_file_fops = { |
| 736 | .llseek = gfs2_llseek, |
| 737 | .read = do_sync_read, |
| 738 | .aio_read = generic_file_aio_read, |
| 739 | .write = do_sync_write, |
| 740 | .aio_write = generic_file_aio_write, |
| 741 | .unlocked_ioctl = gfs2_ioctl, |
| 742 | .mmap = gfs2_mmap, |
| 743 | .open = gfs2_open, |
| 744 | .release = gfs2_close, |
| 745 | .fsync = gfs2_fsync, |
| 746 | .lock = gfs2_lock, |
| 747 | .flock = gfs2_flock, |
| 748 | .splice_read = generic_file_splice_read, |
| 749 | .splice_write = generic_file_splice_write, |
| 750 | .setlease = gfs2_setlease, |
| 751 | }; |
| 752 | |
| 753 | const struct file_operations gfs2_dir_fops = { |
| 754 | .readdir = gfs2_readdir, |
| 755 | .unlocked_ioctl = gfs2_ioctl, |
| 756 | .open = gfs2_open, |
| 757 | .release = gfs2_close, |
| 758 | .fsync = gfs2_fsync, |
| 759 | .lock = gfs2_lock, |
| 760 | .flock = gfs2_flock, |
| 761 | }; |
| 762 | |
| 763 | const struct file_operations gfs2_file_fops_nolock = { |
| 764 | .llseek = gfs2_llseek, |
| 765 | .read = do_sync_read, |
| 766 | .aio_read = generic_file_aio_read, |
| 767 | .write = do_sync_write, |
| 768 | .aio_write = generic_file_aio_write, |
| 769 | .unlocked_ioctl = gfs2_ioctl, |
| 770 | .mmap = gfs2_mmap, |
| 771 | .open = gfs2_open, |
| 772 | .release = gfs2_close, |
| 773 | .fsync = gfs2_fsync, |
| 774 | .splice_read = generic_file_splice_read, |
| 775 | .splice_write = generic_file_splice_write, |
| 776 | .setlease = gfs2_setlease, |
| 777 | }; |
| 778 | |
| 779 | const struct file_operations gfs2_dir_fops_nolock = { |
| 780 | .readdir = gfs2_readdir, |
| 781 | .unlocked_ioctl = gfs2_ioctl, |
| 782 | .open = gfs2_open, |
| 783 | .release = gfs2_close, |
| 784 | .fsync = gfs2_fsync, |
| 785 | }; |
| 786 | |