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TOMOYO Linux Cross Reference
Linux/fs/jfs/inode.c

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  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
  7  *   the Free Software Foundation; either version 2 of the License, or
  8  *   (at your option) any later version.
  9  *
 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
 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
 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>
 25 #include <linux/uio.h>
 26 #include <linux/writeback.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"
 34 
 35 
 36 struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
 37 {
 38         struct inode *inode;
 39         int ret;
 40 
 41         inode = iget_locked(sb, ino);
 42         if (!inode)
 43                 return ERR_PTR(-ENOMEM);
 44         if (!(inode->i_state & I_NEW))
 45                 return inode;
 46 
 47         ret = diRead(inode);
 48         if (ret < 0) {
 49                 iget_failed(inode);
 50                 return ERR_PTR(ret);
 51         }
 52 
 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_nohighmem(inode);
 64                         inode->i_mapping->a_ops = &jfs_aops;
 65                 } else {
 66                         inode->i_op = &jfs_fast_symlink_inode_operations;
 67                         inode->i_link = JFS_IP(inode)->i_inline;
 68                         /*
 69                          * The inline data should be null-terminated, but
 70                          * don't let on-disk corruption crash the kernel
 71                          */
 72                         inode->i_link[inode->i_size] = '\0';
 73                 }
 74         } else {
 75                 inode->i_op = &jfs_file_inode_operations;
 76                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 77         }
 78         unlock_new_inode(inode);
 79         return inode;
 80 }
 81 
 82 /*
 83  * Workhorse of both fsync & write_inode
 84  */
 85 int jfs_commit_inode(struct inode *inode, int wait)
 86 {
 87         int rc = 0;
 88         tid_t tid;
 89         static int noisy = 5;
 90 
 91         jfs_info("In jfs_commit_inode, inode = 0x%p", inode);
 92 
 93         /*
 94          * Don't commit if inode has been committed since last being
 95          * marked dirty, or if it has been deleted.
 96          */
 97         if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode))
 98                 return 0;
 99 
100         if (isReadOnly(inode)) {
101                 /* kernel allows writes to devices on read-only
102                  * partitions and may think inode is dirty
103                  */
104                 if (!special_file(inode->i_mode) && noisy) {
105                         jfs_err("jfs_commit_inode(0x%p) called on read-only volume",
106                                 inode);
107                         jfs_err("Is remount racy?");
108                         noisy--;
109                 }
110                 return 0;
111         }
112 
113         tid = txBegin(inode->i_sb, COMMIT_INODE);
114         mutex_lock(&JFS_IP(inode)->commit_mutex);
115 
116         /*
117          * Retest inode state after taking commit_mutex
118          */
119         if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
120                 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
121 
122         txEnd(tid);
123         mutex_unlock(&JFS_IP(inode)->commit_mutex);
124         return rc;
125 }
126 
127 int jfs_write_inode(struct inode *inode, struct writeback_control *wbc)
128 {
129         int wait = wbc->sync_mode == WB_SYNC_ALL;
130 
131         if (inode->i_nlink == 0)
132                 return 0;
133         /*
134          * If COMMIT_DIRTY is not set, the inode isn't really dirty.
135          * It has been committed since the last change, but was still
136          * on the dirty inode list.
137          */
138         if (!test_cflag(COMMIT_Dirty, inode)) {
139                 /* Make sure committed changes hit the disk */
140                 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
141                 return 0;
142         }
143 
144         if (jfs_commit_inode(inode, wait)) {
145                 jfs_err("jfs_write_inode: jfs_commit_inode failed!");
146                 return -EIO;
147         } else
148                 return 0;
149 }
150 
151 void jfs_evict_inode(struct inode *inode)
152 {
153         jfs_info("In jfs_evict_inode, inode = 0x%p", inode);
154 
155         if (!inode->i_nlink && !is_bad_inode(inode)) {
156                 dquot_initialize(inode);
157 
158                 if (JFS_IP(inode)->fileset == FILESYSTEM_I) {
159                         truncate_inode_pages_final(&inode->i_data);
160 
161                         if (test_cflag(COMMIT_Freewmap, inode))
162                                 jfs_free_zero_link(inode);
163 
164                         diFree(inode);
165 
166                         /*
167                          * Free the inode from the quota allocation.
168                          */
169                         dquot_initialize(inode);
170                         dquot_free_inode(inode);
171                 }
172         } else {
173                 truncate_inode_pages_final(&inode->i_data);
174         }
175         clear_inode(inode);
176         dquot_drop(inode);
177 }
178 
179 void jfs_dirty_inode(struct inode *inode, int flags)
180 {
181         static int noisy = 5;
182 
183         if (isReadOnly(inode)) {
184                 if (!special_file(inode->i_mode) && noisy) {
185                         /* kernel allows writes to devices on read-only
186                          * partitions and may try to mark inode dirty
187                          */
188                         jfs_err("jfs_dirty_inode called on read-only volume");
189                         jfs_err("Is remount racy?");
190                         noisy--;
191                 }
192                 return;
193         }
194 
195         set_cflag(COMMIT_Dirty, inode);
196 }
197 
198 int jfs_get_block(struct inode *ip, sector_t lblock,
199                   struct buffer_head *bh_result, int create)
200 {
201         s64 lblock64 = lblock;
202         int rc = 0;
203         xad_t xad;
204         s64 xaddr;
205         int xflag;
206         s32 xlen = bh_result->b_size >> ip->i_blkbits;
207 
208         /*
209          * Take appropriate lock on inode
210          */
211         if (create)
212                 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
213         else
214                 IREAD_LOCK(ip, RDWRLOCK_NORMAL);
215 
216         if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
217             (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
218             xaddr) {
219                 if (xflag & XAD_NOTRECORDED) {
220                         if (!create)
221                                 /*
222                                  * Allocated but not recorded, read treats
223                                  * this as a hole
224                                  */
225                                 goto unlock;
226 #ifdef _JFS_4K
227                         XADoffset(&xad, lblock64);
228                         XADlength(&xad, xlen);
229                         XADaddress(&xad, xaddr);
230 #else                           /* _JFS_4K */
231                         /*
232                          * As long as block size = 4K, this isn't a problem.
233                          * We should mark the whole page not ABNR, but how
234                          * will we know to mark the other blocks BH_New?
235                          */
236                         BUG();
237 #endif                          /* _JFS_4K */
238                         rc = extRecord(ip, &xad);
239                         if (rc)
240                                 goto unlock;
241                         set_buffer_new(bh_result);
242                 }
243 
244                 map_bh(bh_result, ip->i_sb, xaddr);
245                 bh_result->b_size = xlen << ip->i_blkbits;
246                 goto unlock;
247         }
248         if (!create)
249                 goto unlock;
250 
251         /*
252          * Allocate a new block
253          */
254 #ifdef _JFS_4K
255         if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
256                 goto unlock;
257         rc = extAlloc(ip, xlen, lblock64, &xad, false);
258         if (rc)
259                 goto unlock;
260 
261         set_buffer_new(bh_result);
262         map_bh(bh_result, ip->i_sb, addressXAD(&xad));
263         bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
264 
265 #else                           /* _JFS_4K */
266         /*
267          * We need to do whatever it takes to keep all but the last buffers
268          * in 4K pages - see jfs_write.c
269          */
270         BUG();
271 #endif                          /* _JFS_4K */
272 
273       unlock:
274         /*
275          * Release lock on inode
276          */
277         if (create)
278                 IWRITE_UNLOCK(ip);
279         else
280                 IREAD_UNLOCK(ip);
281         return rc;
282 }
283 
284 static int jfs_writepage(struct page *page, struct writeback_control *wbc)
285 {
286         return block_write_full_page(page, jfs_get_block, wbc);
287 }
288 
289 static int jfs_writepages(struct address_space *mapping,
290                         struct writeback_control *wbc)
291 {
292         return mpage_writepages(mapping, wbc, jfs_get_block);
293 }
294 
295 static int jfs_readpage(struct file *file, struct page *page)
296 {
297         return mpage_readpage(page, jfs_get_block);
298 }
299 
300 static int jfs_readpages(struct file *file, struct address_space *mapping,
301                 struct list_head *pages, unsigned nr_pages)
302 {
303         return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
304 }
305 
306 static void jfs_write_failed(struct address_space *mapping, loff_t to)
307 {
308         struct inode *inode = mapping->host;
309 
310         if (to > inode->i_size) {
311                 truncate_pagecache(inode, inode->i_size);
312                 jfs_truncate(inode);
313         }
314 }
315 
316 static int jfs_write_begin(struct file *file, struct address_space *mapping,
317                                 loff_t pos, unsigned len, unsigned flags,
318                                 struct page **pagep, void **fsdata)
319 {
320         int ret;
321 
322         ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
323                                 jfs_get_block);
324         if (unlikely(ret))
325                 jfs_write_failed(mapping, pos + len);
326 
327         return ret;
328 }
329 
330 static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
331 {
332         return generic_block_bmap(mapping, block, jfs_get_block);
333 }
334 
335 static ssize_t jfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
336 {
337         struct file *file = iocb->ki_filp;
338         struct address_space *mapping = file->f_mapping;
339         struct inode *inode = file->f_mapping->host;
340         size_t count = iov_iter_count(iter);
341         ssize_t ret;
342 
343         ret = blockdev_direct_IO(iocb, inode, iter, jfs_get_block);
344 
345         /*
346          * In case of error extending write may have instantiated a few
347          * blocks outside i_size. Trim these off again.
348          */
349         if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
350                 loff_t isize = i_size_read(inode);
351                 loff_t end = iocb->ki_pos + count;
352 
353                 if (end > isize)
354                         jfs_write_failed(mapping, end);
355         }
356 
357         return ret;
358 }
359 
360 const struct address_space_operations jfs_aops = {
361         .readpage       = jfs_readpage,
362         .readpages      = jfs_readpages,
363         .writepage      = jfs_writepage,
364         .writepages     = jfs_writepages,
365         .write_begin    = jfs_write_begin,
366         .write_end      = nobh_write_end,
367         .bmap           = jfs_bmap,
368         .direct_IO      = jfs_direct_IO,
369 };
370 
371 /*
372  * Guts of jfs_truncate.  Called with locks already held.  Can be called
373  * with directory for truncating directory index table.
374  */
375 void jfs_truncate_nolock(struct inode *ip, loff_t length)
376 {
377         loff_t newsize;
378         tid_t tid;
379 
380         ASSERT(length >= 0);
381 
382         if (test_cflag(COMMIT_Nolink, ip)) {
383                 xtTruncate(0, ip, length, COMMIT_WMAP);
384                 return;
385         }
386 
387         do {
388                 tid = txBegin(ip->i_sb, 0);
389 
390                 /*
391                  * The commit_mutex cannot be taken before txBegin.
392                  * txBegin may block and there is a chance the inode
393                  * could be marked dirty and need to be committed
394                  * before txBegin unblocks
395                  */
396                 mutex_lock(&JFS_IP(ip)->commit_mutex);
397 
398                 newsize = xtTruncate(tid, ip, length,
399                                      COMMIT_TRUNCATE | COMMIT_PWMAP);
400                 if (newsize < 0) {
401                         txEnd(tid);
402                         mutex_unlock(&JFS_IP(ip)->commit_mutex);
403                         break;
404                 }
405 
406                 ip->i_mtime = ip->i_ctime = CURRENT_TIME;
407                 mark_inode_dirty(ip);
408 
409                 txCommit(tid, 1, &ip, 0);
410                 txEnd(tid);
411                 mutex_unlock(&JFS_IP(ip)->commit_mutex);
412         } while (newsize > length);     /* Truncate isn't always atomic */
413 }
414 
415 void jfs_truncate(struct inode *ip)
416 {
417         jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
418 
419         nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
420 
421         IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
422         jfs_truncate_nolock(ip, ip->i_size);
423         IWRITE_UNLOCK(ip);
424 }
425 

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