Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) International Business Machines Corp., 2000-2004 |
| 3 | * Portions Copyright (C) Christoph Hellwig, 2001-2002 |
| 4 | * |
| 5 | * This program is free software; you can redistribute it and/or modify |
| 6 | * it under the terms of the GNU General Public License as published by |
Dave Kleikamp | 63f83c9 | 2006-10-02 09:55:27 -0500 | [diff] [blame] | 7 | * the Free Software Foundation; either version 2 of the License, or |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 8 | * (at your option) any later version. |
Dave Kleikamp | 63f83c9 | 2006-10-02 09:55:27 -0500 | [diff] [blame] | 9 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 10 | * This program is distributed in the hope that it will be useful, |
| 11 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 12 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See |
| 13 | * the GNU General Public License for more details. |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License |
Dave Kleikamp | 63f83c9 | 2006-10-02 09:55:27 -0500 | [diff] [blame] | 16 | * along with this program; if not, write to the Free Software |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 18 | */ |
| 19 | |
| 20 | #include <linux/fs.h> |
| 21 | #include <linux/mpage.h> |
| 22 | #include <linux/buffer_head.h> |
| 23 | #include <linux/pagemap.h> |
| 24 | #include <linux/quotaops.h> |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 25 | #include <linux/writeback.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include "jfs_incore.h" |
Dave Kleikamp | 1868f4a | 2005-05-04 15:29:35 -0500 | [diff] [blame] | 27 | #include "jfs_inode.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | #include "jfs_filsys.h" |
| 29 | #include "jfs_imap.h" |
| 30 | #include "jfs_extent.h" |
| 31 | #include "jfs_unicode.h" |
| 32 | #include "jfs_debug.h" |
| 33 | |
| 34 | |
David Howells | eab1df7 | 2008-02-07 00:15:43 -0800 | [diff] [blame] | 35 | struct inode *jfs_iget(struct super_block *sb, unsigned long ino) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 36 | { |
David Howells | eab1df7 | 2008-02-07 00:15:43 -0800 | [diff] [blame] | 37 | struct inode *inode; |
| 38 | int ret; |
| 39 | |
| 40 | inode = iget_locked(sb, ino); |
| 41 | if (!inode) |
| 42 | return ERR_PTR(-ENOMEM); |
| 43 | if (!(inode->i_state & I_NEW)) |
| 44 | return inode; |
| 45 | |
| 46 | ret = diRead(inode); |
| 47 | if (ret < 0) { |
| 48 | iget_failed(inode); |
| 49 | return ERR_PTR(ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 50 | } |
| 51 | |
| 52 | if (S_ISREG(inode->i_mode)) { |
| 53 | inode->i_op = &jfs_file_inode_operations; |
| 54 | inode->i_fop = &jfs_file_operations; |
| 55 | inode->i_mapping->a_ops = &jfs_aops; |
| 56 | } else if (S_ISDIR(inode->i_mode)) { |
| 57 | inode->i_op = &jfs_dir_inode_operations; |
| 58 | inode->i_fop = &jfs_dir_operations; |
| 59 | } else if (S_ISLNK(inode->i_mode)) { |
| 60 | if (inode->i_size >= IDATASIZE) { |
| 61 | inode->i_op = &page_symlink_inode_operations; |
| 62 | inode->i_mapping->a_ops = &jfs_aops; |
Dave Kleikamp | d69e83d | 2008-12-16 10:21:34 -0600 | [diff] [blame] | 63 | } else { |
Dmitry Monakhov | c7f2e1f | 2010-04-16 08:05:50 -0500 | [diff] [blame] | 64 | inode->i_op = &jfs_fast_symlink_inode_operations; |
Dave Kleikamp | d69e83d | 2008-12-16 10:21:34 -0600 | [diff] [blame] | 65 | /* |
| 66 | * The inline data should be null-terminated, but |
| 67 | * don't let on-disk corruption crash the kernel |
| 68 | */ |
| 69 | JFS_IP(inode)->i_inline[inode->i_size] = '\0'; |
| 70 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 71 | } else { |
| 72 | inode->i_op = &jfs_file_inode_operations; |
| 73 | init_special_inode(inode, inode->i_mode, inode->i_rdev); |
| 74 | } |
David Howells | eab1df7 | 2008-02-07 00:15:43 -0800 | [diff] [blame] | 75 | unlock_new_inode(inode); |
| 76 | return inode; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | } |
| 78 | |
| 79 | /* |
| 80 | * Workhorse of both fsync & write_inode |
| 81 | */ |
| 82 | int jfs_commit_inode(struct inode *inode, int wait) |
| 83 | { |
| 84 | int rc = 0; |
| 85 | tid_t tid; |
| 86 | static int noisy = 5; |
| 87 | |
| 88 | jfs_info("In jfs_commit_inode, inode = 0x%p", inode); |
| 89 | |
| 90 | /* |
| 91 | * Don't commit if inode has been committed since last being |
| 92 | * marked dirty, or if it has been deleted. |
| 93 | */ |
| 94 | if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode)) |
| 95 | return 0; |
| 96 | |
| 97 | if (isReadOnly(inode)) { |
| 98 | /* kernel allows writes to devices on read-only |
| 99 | * partitions and may think inode is dirty |
| 100 | */ |
| 101 | if (!special_file(inode->i_mode) && noisy) { |
| 102 | jfs_err("jfs_commit_inode(0x%p) called on " |
| 103 | "read-only volume", inode); |
| 104 | jfs_err("Is remount racy?"); |
| 105 | noisy--; |
| 106 | } |
| 107 | return 0; |
| 108 | } |
| 109 | |
| 110 | tid = txBegin(inode->i_sb, COMMIT_INODE); |
Ingo Molnar | 1de8744 | 2006-01-24 15:22:50 -0600 | [diff] [blame] | 111 | mutex_lock(&JFS_IP(inode)->commit_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 112 | |
| 113 | /* |
Ingo Molnar | 1de8744 | 2006-01-24 15:22:50 -0600 | [diff] [blame] | 114 | * Retest inode state after taking commit_mutex |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 115 | */ |
| 116 | if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode)) |
| 117 | rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0); |
| 118 | |
| 119 | txEnd(tid); |
Ingo Molnar | 1de8744 | 2006-01-24 15:22:50 -0600 | [diff] [blame] | 120 | mutex_unlock(&JFS_IP(inode)->commit_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 121 | return rc; |
| 122 | } |
| 123 | |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 124 | int jfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 125 | { |
Christoph Hellwig | a9185b4 | 2010-03-05 09:21:37 +0100 | [diff] [blame] | 126 | int wait = wbc->sync_mode == WB_SYNC_ALL; |
| 127 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | if (test_cflag(COMMIT_Nolink, inode)) |
| 129 | return 0; |
| 130 | /* |
| 131 | * If COMMIT_DIRTY is not set, the inode isn't really dirty. |
| 132 | * It has been committed since the last change, but was still |
| 133 | * on the dirty inode list. |
| 134 | */ |
| 135 | if (!test_cflag(COMMIT_Dirty, inode)) { |
| 136 | /* Make sure committed changes hit the disk */ |
| 137 | jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait); |
| 138 | return 0; |
| 139 | } |
| 140 | |
| 141 | if (jfs_commit_inode(inode, wait)) { |
| 142 | jfs_err("jfs_write_inode: jfs_commit_inode failed!"); |
| 143 | return -EIO; |
| 144 | } else |
| 145 | return 0; |
| 146 | } |
| 147 | |
Al Viro | 62aff86 | 2010-06-07 00:28:54 -0400 | [diff] [blame] | 148 | void jfs_evict_inode(struct inode *inode) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | { |
Al Viro | 62aff86 | 2010-06-07 00:28:54 -0400 | [diff] [blame] | 150 | jfs_info("In jfs_evict_inode, inode = 0x%p", inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 151 | |
Al Viro | 62aff86 | 2010-06-07 00:28:54 -0400 | [diff] [blame] | 152 | if (!inode->i_nlink && !is_bad_inode(inode)) { |
Christoph Hellwig | 871a293 | 2010-03-03 09:05:07 -0500 | [diff] [blame] | 153 | dquot_initialize(inode); |
Christoph Hellwig | 907f455 | 2010-03-03 09:05:06 -0500 | [diff] [blame] | 154 | |
Al Viro | 62aff86 | 2010-06-07 00:28:54 -0400 | [diff] [blame] | 155 | if (JFS_IP(inode)->fileset == FILESYSTEM_I) { |
| 156 | truncate_inode_pages(&inode->i_data, 0); |
| 157 | |
| 158 | if (test_cflag(COMMIT_Freewmap, inode)) |
| 159 | jfs_free_zero_link(inode); |
| 160 | |
| 161 | diFree(inode); |
| 162 | |
| 163 | /* |
| 164 | * Free the inode from the quota allocation. |
| 165 | */ |
| 166 | dquot_initialize(inode); |
| 167 | dquot_free_inode(inode); |
| 168 | } |
| 169 | } else { |
Linus Torvalds | 3298369 | 2005-09-11 10:14:54 -0700 | [diff] [blame] | 170 | truncate_inode_pages(&inode->i_data, 0); |
Dave Kleikamp | b1b5d7f9 | 2005-08-30 14:28:56 -0500 | [diff] [blame] | 171 | } |
Al Viro | 62aff86 | 2010-06-07 00:28:54 -0400 | [diff] [blame] | 172 | end_writeback(inode); |
| 173 | dquot_drop(inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 174 | } |
| 175 | |
Christoph Hellwig | aa38572 | 2011-05-27 06:53:02 -0400 | [diff] [blame] | 176 | void jfs_dirty_inode(struct inode *inode, int flags) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | { |
| 178 | static int noisy = 5; |
| 179 | |
| 180 | if (isReadOnly(inode)) { |
| 181 | if (!special_file(inode->i_mode) && noisy) { |
| 182 | /* kernel allows writes to devices on read-only |
| 183 | * partitions and may try to mark inode dirty |
| 184 | */ |
| 185 | jfs_err("jfs_dirty_inode called on read-only volume"); |
| 186 | jfs_err("Is remount racy?"); |
| 187 | noisy--; |
| 188 | } |
| 189 | return; |
| 190 | } |
| 191 | |
| 192 | set_cflag(COMMIT_Dirty, inode); |
| 193 | } |
| 194 | |
Dave Kleikamp | 115ff50 | 2006-07-26 14:52:13 -0500 | [diff] [blame] | 195 | int jfs_get_block(struct inode *ip, sector_t lblock, |
| 196 | struct buffer_head *bh_result, int create) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 197 | { |
| 198 | s64 lblock64 = lblock; |
| 199 | int rc = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 200 | xad_t xad; |
| 201 | s64 xaddr; |
| 202 | int xflag; |
Dave Kleikamp | 115ff50 | 2006-07-26 14:52:13 -0500 | [diff] [blame] | 203 | s32 xlen = bh_result->b_size >> ip->i_blkbits; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 204 | |
| 205 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 206 | * Take appropriate lock on inode |
| 207 | */ |
Dave Kleikamp | 7fab479 | 2005-05-02 12:25:02 -0600 | [diff] [blame] | 208 | if (create) |
Dave Kleikamp | 82d5b9a | 2007-01-09 14:14:48 -0600 | [diff] [blame] | 209 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
Dave Kleikamp | 7fab479 | 2005-05-02 12:25:02 -0600 | [diff] [blame] | 210 | else |
Dave Kleikamp | 82d5b9a | 2007-01-09 14:14:48 -0600 | [diff] [blame] | 211 | IREAD_LOCK(ip, RDWRLOCK_NORMAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 212 | |
| 213 | if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) && |
Dave Kleikamp | 115ff50 | 2006-07-26 14:52:13 -0500 | [diff] [blame] | 214 | (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) && |
Dave Kleikamp | 6628465 | 2005-05-02 12:25:13 -0600 | [diff] [blame] | 215 | xaddr) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 216 | if (xflag & XAD_NOTRECORDED) { |
| 217 | if (!create) |
| 218 | /* |
| 219 | * Allocated but not recorded, read treats |
| 220 | * this as a hole |
| 221 | */ |
| 222 | goto unlock; |
| 223 | #ifdef _JFS_4K |
| 224 | XADoffset(&xad, lblock64); |
| 225 | XADlength(&xad, xlen); |
| 226 | XADaddress(&xad, xaddr); |
| 227 | #else /* _JFS_4K */ |
| 228 | /* |
| 229 | * As long as block size = 4K, this isn't a problem. |
| 230 | * We should mark the whole page not ABNR, but how |
| 231 | * will we know to mark the other blocks BH_New? |
| 232 | */ |
| 233 | BUG(); |
| 234 | #endif /* _JFS_4K */ |
| 235 | rc = extRecord(ip, &xad); |
| 236 | if (rc) |
| 237 | goto unlock; |
| 238 | set_buffer_new(bh_result); |
| 239 | } |
| 240 | |
| 241 | map_bh(bh_result, ip->i_sb, xaddr); |
| 242 | bh_result->b_size = xlen << ip->i_blkbits; |
| 243 | goto unlock; |
| 244 | } |
| 245 | if (!create) |
| 246 | goto unlock; |
| 247 | |
| 248 | /* |
| 249 | * Allocate a new block |
| 250 | */ |
| 251 | #ifdef _JFS_4K |
| 252 | if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad))) |
| 253 | goto unlock; |
Richard Knutsson | 4d81715 | 2006-09-30 23:27:14 -0700 | [diff] [blame] | 254 | rc = extAlloc(ip, xlen, lblock64, &xad, false); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 255 | if (rc) |
| 256 | goto unlock; |
| 257 | |
| 258 | set_buffer_new(bh_result); |
| 259 | map_bh(bh_result, ip->i_sb, addressXAD(&xad)); |
| 260 | bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits; |
| 261 | |
| 262 | #else /* _JFS_4K */ |
| 263 | /* |
| 264 | * We need to do whatever it takes to keep all but the last buffers |
| 265 | * in 4K pages - see jfs_write.c |
| 266 | */ |
| 267 | BUG(); |
| 268 | #endif /* _JFS_4K */ |
| 269 | |
| 270 | unlock: |
| 271 | /* |
| 272 | * Release lock on inode |
| 273 | */ |
Dave Kleikamp | 7fab479 | 2005-05-02 12:25:02 -0600 | [diff] [blame] | 274 | if (create) |
| 275 | IWRITE_UNLOCK(ip); |
| 276 | else |
| 277 | IREAD_UNLOCK(ip); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | return rc; |
| 279 | } |
| 280 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 281 | static int jfs_writepage(struct page *page, struct writeback_control *wbc) |
| 282 | { |
Nick Piggin | d5c5f84 | 2007-10-16 01:25:22 -0700 | [diff] [blame] | 283 | return block_write_full_page(page, jfs_get_block, wbc); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 284 | } |
| 285 | |
| 286 | static int jfs_writepages(struct address_space *mapping, |
| 287 | struct writeback_control *wbc) |
| 288 | { |
| 289 | return mpage_writepages(mapping, wbc, jfs_get_block); |
| 290 | } |
| 291 | |
| 292 | static int jfs_readpage(struct file *file, struct page *page) |
| 293 | { |
| 294 | return mpage_readpage(page, jfs_get_block); |
| 295 | } |
| 296 | |
| 297 | static int jfs_readpages(struct file *file, struct address_space *mapping, |
| 298 | struct list_head *pages, unsigned nr_pages) |
| 299 | { |
| 300 | return mpage_readpages(mapping, pages, nr_pages, jfs_get_block); |
| 301 | } |
| 302 | |
Nick Piggin | d5c5f84 | 2007-10-16 01:25:22 -0700 | [diff] [blame] | 303 | static int jfs_write_begin(struct file *file, struct address_space *mapping, |
| 304 | loff_t pos, unsigned len, unsigned flags, |
| 305 | struct page **pagep, void **fsdata) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | { |
Christoph Hellwig | ea0f04e | 2010-06-04 11:29:54 +0200 | [diff] [blame] | 307 | int ret; |
| 308 | |
| 309 | ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata, |
Nick Piggin | d5c5f84 | 2007-10-16 01:25:22 -0700 | [diff] [blame] | 310 | jfs_get_block); |
Christoph Hellwig | ea0f04e | 2010-06-04 11:29:54 +0200 | [diff] [blame] | 311 | if (unlikely(ret)) { |
| 312 | loff_t isize = mapping->host->i_size; |
| 313 | if (pos + len > isize) |
| 314 | vmtruncate(mapping->host, isize); |
| 315 | } |
| 316 | |
| 317 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | } |
| 319 | |
| 320 | static sector_t jfs_bmap(struct address_space *mapping, sector_t block) |
| 321 | { |
| 322 | return generic_block_bmap(mapping, block, jfs_get_block); |
| 323 | } |
| 324 | |
| 325 | static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb, |
| 326 | const struct iovec *iov, loff_t offset, unsigned long nr_segs) |
| 327 | { |
| 328 | struct file *file = iocb->ki_filp; |
| 329 | struct inode *inode = file->f_mapping->host; |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 330 | ssize_t ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 331 | |
Christoph Hellwig | aacfc19c | 2011-06-24 14:29:47 -0400 | [diff] [blame] | 332 | ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs, |
| 333 | jfs_get_block); |
Christoph Hellwig | eafdc7d | 2010-06-04 11:29:53 +0200 | [diff] [blame] | 334 | |
| 335 | /* |
| 336 | * In case of error extending write may have instantiated a few |
| 337 | * blocks outside i_size. Trim these off again. |
| 338 | */ |
| 339 | if (unlikely((rw & WRITE) && ret < 0)) { |
| 340 | loff_t isize = i_size_read(inode); |
| 341 | loff_t end = offset + iov_length(iov, nr_segs); |
| 342 | |
| 343 | if (end > isize) |
| 344 | vmtruncate(inode, isize); |
| 345 | } |
| 346 | |
| 347 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 348 | } |
| 349 | |
Christoph Hellwig | f5e54d6 | 2006-06-28 04:26:44 -0700 | [diff] [blame] | 350 | const struct address_space_operations jfs_aops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 351 | .readpage = jfs_readpage, |
| 352 | .readpages = jfs_readpages, |
| 353 | .writepage = jfs_writepage, |
| 354 | .writepages = jfs_writepages, |
Nick Piggin | d5c5f84 | 2007-10-16 01:25:22 -0700 | [diff] [blame] | 355 | .write_begin = jfs_write_begin, |
Nick Piggin | 03158cd | 2007-10-16 01:25:25 -0700 | [diff] [blame] | 356 | .write_end = nobh_write_end, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | .bmap = jfs_bmap, |
| 358 | .direct_IO = jfs_direct_IO, |
| 359 | }; |
| 360 | |
| 361 | /* |
| 362 | * Guts of jfs_truncate. Called with locks already held. Can be called |
| 363 | * with directory for truncating directory index table. |
| 364 | */ |
| 365 | void jfs_truncate_nolock(struct inode *ip, loff_t length) |
| 366 | { |
| 367 | loff_t newsize; |
| 368 | tid_t tid; |
| 369 | |
| 370 | ASSERT(length >= 0); |
| 371 | |
| 372 | if (test_cflag(COMMIT_Nolink, ip)) { |
| 373 | xtTruncate(0, ip, length, COMMIT_WMAP); |
| 374 | return; |
| 375 | } |
| 376 | |
| 377 | do { |
| 378 | tid = txBegin(ip->i_sb, 0); |
| 379 | |
| 380 | /* |
Ingo Molnar | 1de8744 | 2006-01-24 15:22:50 -0600 | [diff] [blame] | 381 | * The commit_mutex cannot be taken before txBegin. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 382 | * txBegin may block and there is a chance the inode |
| 383 | * could be marked dirty and need to be committed |
| 384 | * before txBegin unblocks |
| 385 | */ |
Ingo Molnar | 1de8744 | 2006-01-24 15:22:50 -0600 | [diff] [blame] | 386 | mutex_lock(&JFS_IP(ip)->commit_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 387 | |
| 388 | newsize = xtTruncate(tid, ip, length, |
| 389 | COMMIT_TRUNCATE | COMMIT_PWMAP); |
| 390 | if (newsize < 0) { |
| 391 | txEnd(tid); |
Ingo Molnar | 1de8744 | 2006-01-24 15:22:50 -0600 | [diff] [blame] | 392 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 393 | break; |
| 394 | } |
| 395 | |
| 396 | ip->i_mtime = ip->i_ctime = CURRENT_TIME; |
| 397 | mark_inode_dirty(ip); |
| 398 | |
| 399 | txCommit(tid, 1, &ip, 0); |
| 400 | txEnd(tid); |
Ingo Molnar | 1de8744 | 2006-01-24 15:22:50 -0600 | [diff] [blame] | 401 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 402 | } while (newsize > length); /* Truncate isn't always atomic */ |
| 403 | } |
| 404 | |
| 405 | void jfs_truncate(struct inode *ip) |
| 406 | { |
| 407 | jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size); |
| 408 | |
Nick Piggin | 03158cd | 2007-10-16 01:25:25 -0700 | [diff] [blame] | 409 | nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 410 | |
Dave Kleikamp | 82d5b9a | 2007-01-09 14:14:48 -0600 | [diff] [blame] | 411 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 412 | jfs_truncate_nolock(ip, ip->i_size); |
| 413 | IWRITE_UNLOCK(ip); |
| 414 | } |