ARM: 7747/1: pcpu: ensure __my_cpu_offset cannot be re-ordered across barrier()
[linux/fpc-iii.git] / fs / jfs / inode.c
blob730f24e282a652029ca14b0f5032411512914beb
1 /*
2 * Copyright (C) International Business Machines Corp., 2000-2004
3 * Portions Copyright (C) Christoph Hellwig, 2001-2002
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
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
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.
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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>
25 #include <linux/writeback.h>
26 #include <linux/aio.h>
27 #include "jfs_incore.h"
28 #include "jfs_inode.h"
29 #include "jfs_filsys.h"
30 #include "jfs_imap.h"
31 #include "jfs_extent.h"
32 #include "jfs_unicode.h"
33 #include "jfs_debug.h"
36 struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
38 struct inode *inode;
39 int ret;
41 inode = iget_locked(sb, ino);
42 if (!inode)
43 return ERR_PTR(-ENOMEM);
44 if (!(inode->i_state & I_NEW))
45 return inode;
47 ret = diRead(inode);
48 if (ret < 0) {
49 iget_failed(inode);
50 return ERR_PTR(ret);
53 if (S_ISREG(inode->i_mode)) {
54 inode->i_op = &jfs_file_inode_operations;
55 inode->i_fop = &jfs_file_operations;
56 inode->i_mapping->a_ops = &jfs_aops;
57 } else if (S_ISDIR(inode->i_mode)) {
58 inode->i_op = &jfs_dir_inode_operations;
59 inode->i_fop = &jfs_dir_operations;
60 } else if (S_ISLNK(inode->i_mode)) {
61 if (inode->i_size >= IDATASIZE) {
62 inode->i_op = &page_symlink_inode_operations;
63 inode->i_mapping->a_ops = &jfs_aops;
64 } else {
65 inode->i_op = &jfs_fast_symlink_inode_operations;
67 * The inline data should be null-terminated, but
68 * don't let on-disk corruption crash the kernel
70 JFS_IP(inode)->i_inline[inode->i_size] = '\0';
72 } else {
73 inode->i_op = &jfs_file_inode_operations;
74 init_special_inode(inode, inode->i_mode, inode->i_rdev);
76 unlock_new_inode(inode);
77 return inode;
81 * Workhorse of both fsync & write_inode
83 int jfs_commit_inode(struct inode *inode, int wait)
85 int rc = 0;
86 tid_t tid;
87 static int noisy = 5;
89 jfs_info("In jfs_commit_inode, inode = 0x%p", inode);
92 * Don't commit if inode has been committed since last being
93 * marked dirty, or if it has been deleted.
95 if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode))
96 return 0;
98 if (isReadOnly(inode)) {
99 /* kernel allows writes to devices on read-only
100 * partitions and may think inode is dirty
102 if (!special_file(inode->i_mode) && noisy) {
103 jfs_err("jfs_commit_inode(0x%p) called on "
104 "read-only volume", inode);
105 jfs_err("Is remount racy?");
106 noisy--;
108 return 0;
111 tid = txBegin(inode->i_sb, COMMIT_INODE);
112 mutex_lock(&JFS_IP(inode)->commit_mutex);
115 * Retest inode state after taking commit_mutex
117 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
118 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
120 txEnd(tid);
121 mutex_unlock(&JFS_IP(inode)->commit_mutex);
122 return rc;
125 int jfs_write_inode(struct inode *inode, struct writeback_control *wbc)
127 int wait = wbc->sync_mode == WB_SYNC_ALL;
129 if (inode->i_nlink == 0)
130 return 0;
132 * If COMMIT_DIRTY is not set, the inode isn't really dirty.
133 * It has been committed since the last change, but was still
134 * on the dirty inode list.
136 if (!test_cflag(COMMIT_Dirty, inode)) {
137 /* Make sure committed changes hit the disk */
138 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
139 return 0;
142 if (jfs_commit_inode(inode, wait)) {
143 jfs_err("jfs_write_inode: jfs_commit_inode failed!");
144 return -EIO;
145 } else
146 return 0;
149 void jfs_evict_inode(struct inode *inode)
151 jfs_info("In jfs_evict_inode, inode = 0x%p", inode);
153 if (!inode->i_nlink && !is_bad_inode(inode)) {
154 dquot_initialize(inode);
156 if (JFS_IP(inode)->fileset == FILESYSTEM_I) {
157 truncate_inode_pages(&inode->i_data, 0);
159 if (test_cflag(COMMIT_Freewmap, inode))
160 jfs_free_zero_link(inode);
162 diFree(inode);
165 * Free the inode from the quota allocation.
167 dquot_initialize(inode);
168 dquot_free_inode(inode);
170 } else {
171 truncate_inode_pages(&inode->i_data, 0);
173 clear_inode(inode);
174 dquot_drop(inode);
177 void jfs_dirty_inode(struct inode *inode, int flags)
179 static int noisy = 5;
181 if (isReadOnly(inode)) {
182 if (!special_file(inode->i_mode) && noisy) {
183 /* kernel allows writes to devices on read-only
184 * partitions and may try to mark inode dirty
186 jfs_err("jfs_dirty_inode called on read-only volume");
187 jfs_err("Is remount racy?");
188 noisy--;
190 return;
193 set_cflag(COMMIT_Dirty, inode);
196 int jfs_get_block(struct inode *ip, sector_t lblock,
197 struct buffer_head *bh_result, int create)
199 s64 lblock64 = lblock;
200 int rc = 0;
201 xad_t xad;
202 s64 xaddr;
203 int xflag;
204 s32 xlen = bh_result->b_size >> ip->i_blkbits;
207 * Take appropriate lock on inode
209 if (create)
210 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
211 else
212 IREAD_LOCK(ip, RDWRLOCK_NORMAL);
214 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
215 (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
216 xaddr) {
217 if (xflag & XAD_NOTRECORDED) {
218 if (!create)
220 * Allocated but not recorded, read treats
221 * this as a hole
223 goto unlock;
224 #ifdef _JFS_4K
225 XADoffset(&xad, lblock64);
226 XADlength(&xad, xlen);
227 XADaddress(&xad, xaddr);
228 #else /* _JFS_4K */
230 * As long as block size = 4K, this isn't a problem.
231 * We should mark the whole page not ABNR, but how
232 * will we know to mark the other blocks BH_New?
234 BUG();
235 #endif /* _JFS_4K */
236 rc = extRecord(ip, &xad);
237 if (rc)
238 goto unlock;
239 set_buffer_new(bh_result);
242 map_bh(bh_result, ip->i_sb, xaddr);
243 bh_result->b_size = xlen << ip->i_blkbits;
244 goto unlock;
246 if (!create)
247 goto unlock;
250 * Allocate a new block
252 #ifdef _JFS_4K
253 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
254 goto unlock;
255 rc = extAlloc(ip, xlen, lblock64, &xad, false);
256 if (rc)
257 goto unlock;
259 set_buffer_new(bh_result);
260 map_bh(bh_result, ip->i_sb, addressXAD(&xad));
261 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
263 #else /* _JFS_4K */
265 * We need to do whatever it takes to keep all but the last buffers
266 * in 4K pages - see jfs_write.c
268 BUG();
269 #endif /* _JFS_4K */
271 unlock:
273 * Release lock on inode
275 if (create)
276 IWRITE_UNLOCK(ip);
277 else
278 IREAD_UNLOCK(ip);
279 return rc;
282 static int jfs_writepage(struct page *page, struct writeback_control *wbc)
284 return block_write_full_page(page, jfs_get_block, wbc);
287 static int jfs_writepages(struct address_space *mapping,
288 struct writeback_control *wbc)
290 return mpage_writepages(mapping, wbc, jfs_get_block);
293 static int jfs_readpage(struct file *file, struct page *page)
295 return mpage_readpage(page, jfs_get_block);
298 static int jfs_readpages(struct file *file, struct address_space *mapping,
299 struct list_head *pages, unsigned nr_pages)
301 return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
304 static void jfs_write_failed(struct address_space *mapping, loff_t to)
306 struct inode *inode = mapping->host;
308 if (to > inode->i_size) {
309 truncate_pagecache(inode, to, inode->i_size);
310 jfs_truncate(inode);
314 static int jfs_write_begin(struct file *file, struct address_space *mapping,
315 loff_t pos, unsigned len, unsigned flags,
316 struct page **pagep, void **fsdata)
318 int ret;
320 ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
321 jfs_get_block);
322 if (unlikely(ret))
323 jfs_write_failed(mapping, pos + len);
325 return ret;
328 static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
330 return generic_block_bmap(mapping, block, jfs_get_block);
333 static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb,
334 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
336 struct file *file = iocb->ki_filp;
337 struct address_space *mapping = file->f_mapping;
338 struct inode *inode = file->f_mapping->host;
339 ssize_t ret;
341 ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
342 jfs_get_block);
345 * In case of error extending write may have instantiated a few
346 * blocks outside i_size. Trim these off again.
348 if (unlikely((rw & WRITE) && ret < 0)) {
349 loff_t isize = i_size_read(inode);
350 loff_t end = offset + iov_length(iov, nr_segs);
352 if (end > isize)
353 jfs_write_failed(mapping, end);
356 return ret;
359 const struct address_space_operations jfs_aops = {
360 .readpage = jfs_readpage,
361 .readpages = jfs_readpages,
362 .writepage = jfs_writepage,
363 .writepages = jfs_writepages,
364 .write_begin = jfs_write_begin,
365 .write_end = nobh_write_end,
366 .bmap = jfs_bmap,
367 .direct_IO = jfs_direct_IO,
371 * Guts of jfs_truncate. Called with locks already held. Can be called
372 * with directory for truncating directory index table.
374 void jfs_truncate_nolock(struct inode *ip, loff_t length)
376 loff_t newsize;
377 tid_t tid;
379 ASSERT(length >= 0);
381 if (test_cflag(COMMIT_Nolink, ip)) {
382 xtTruncate(0, ip, length, COMMIT_WMAP);
383 return;
386 do {
387 tid = txBegin(ip->i_sb, 0);
390 * The commit_mutex cannot be taken before txBegin.
391 * txBegin may block and there is a chance the inode
392 * could be marked dirty and need to be committed
393 * before txBegin unblocks
395 mutex_lock(&JFS_IP(ip)->commit_mutex);
397 newsize = xtTruncate(tid, ip, length,
398 COMMIT_TRUNCATE | COMMIT_PWMAP);
399 if (newsize < 0) {
400 txEnd(tid);
401 mutex_unlock(&JFS_IP(ip)->commit_mutex);
402 break;
405 ip->i_mtime = ip->i_ctime = CURRENT_TIME;
406 mark_inode_dirty(ip);
408 txCommit(tid, 1, &ip, 0);
409 txEnd(tid);
410 mutex_unlock(&JFS_IP(ip)->commit_mutex);
411 } while (newsize > length); /* Truncate isn't always atomic */
414 void jfs_truncate(struct inode *ip)
416 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
418 nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
420 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
421 jfs_truncate_nolock(ip, ip->i_size);
422 IWRITE_UNLOCK(ip);