~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

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

Version: ~ [ linux-5.14-rc3 ] ~ [ linux-5.13.5 ] ~ [ linux-5.12.19 ] ~ [ linux-5.11.22 ] ~ [ linux-5.10.53 ] ~ [ linux-5.9.16 ] ~ [ linux-5.8.18 ] ~ [ linux-5.7.19 ] ~ [ linux-5.6.19 ] ~ [ linux-5.5.19 ] ~ [ linux-5.4.135 ] ~ [ linux-5.3.18 ] ~ [ linux-5.2.21 ] ~ [ linux-5.1.21 ] ~ [ linux-5.0.21 ] ~ [ linux-4.20.17 ] ~ [ linux-4.19.198 ] ~ [ linux-4.18.20 ] ~ [ linux-4.17.19 ] ~ [ linux-4.16.18 ] ~ [ linux-4.15.18 ] ~ [ linux-4.14.240 ] ~ [ linux-4.13.16 ] ~ [ linux-4.12.14 ] ~ [ linux-4.11.12 ] ~ [ linux-4.10.17 ] ~ [ linux-4.9.276 ] ~ [ linux-4.8.17 ] ~ [ linux-4.7.10 ] ~ [ linux-4.6.7 ] ~ [ linux-4.5.7 ] ~ [ linux-4.4.276 ] ~ [ linux-4.3.6 ] ~ [ linux-4.2.8 ] ~ [ linux-4.1.52 ] ~ [ linux-4.0.9 ] ~ [ linux-3.18.140 ] ~ [ linux-3.16.85 ] ~ [ linux-3.14.79 ] ~ [ linux-3.12.74 ] ~ [ linux-3.10.108 ] ~ [ linux-2.6.32.71 ] ~ [ linux-2.6.0 ] ~ [ linux-2.4.37.11 ] ~ [ unix-v6-master ] ~ [ ccs-tools-1.8.5 ] ~ [ policy-sample ] ~
Architecture: ~ [ i386 ] ~ [ alpha ] ~ [ m68k ] ~ [ mips ] ~ [ ppc ] ~ [ sparc ] ~ [ sparc64 ] ~

  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/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"
 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->i_mapping->a_ops = &jfs_aops;
 64                 } else {
 65                         inode->i_op = &jfs_fast_symlink_inode_operations;
 66                         /*
 67                          * The inline data should be null-terminated, but
 68                          * don't let on-disk corruption crash the kernel
 69                          */
 70                         JFS_IP(inode)->i_inline[inode->i_size] = '\0';
 71                 }
 72         } else {
 73                 inode->i_op = &jfs_file_inode_operations;
 74                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 75         }
 76         unlock_new_inode(inode);
 77         return inode;
 78 }
 79 
 80 /*
 81  * Workhorse of both fsync & write_inode
 82  */
 83 int jfs_commit_inode(struct inode *inode, int wait)
 84 {
 85         int rc = 0;
 86         tid_t tid;
 87         static int noisy = 5;
 88 
 89         jfs_info("In jfs_commit_inode, inode = 0x%p", inode);
 90 
 91         /*
 92          * Don't commit if inode has been committed since last being
 93          * marked dirty, or if it has been deleted.
 94          */
 95         if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode))
 96                 return 0;
 97 
 98         if (isReadOnly(inode)) {
 99                 /* kernel allows writes to devices on read-only
100                  * partitions and may think inode is dirty
101                  */
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--;
107                 }
108                 return 0;
109         }
110 
111         tid = txBegin(inode->i_sb, COMMIT_INODE);
112         mutex_lock(&JFS_IP(inode)->commit_mutex);
113 
114         /*
115          * Retest inode state after taking commit_mutex
116          */
117         if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
118                 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
119 
120         txEnd(tid);
121         mutex_unlock(&JFS_IP(inode)->commit_mutex);
122         return rc;
123 }
124 
125 int jfs_write_inode(struct inode *inode, struct writeback_control *wbc)
126 {
127         int wait = wbc->sync_mode == WB_SYNC_ALL;
128 
129         if (inode->i_nlink == 0)
130                 return 0;
131         /*
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.
135          */
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;
140          }
141 
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;
147 }
148 
149 void jfs_evict_inode(struct inode *inode)
150 {
151         jfs_info("In jfs_evict_inode, inode = 0x%p", inode);
152 
153         if (!inode->i_nlink && !is_bad_inode(inode)) {
154                 dquot_initialize(inode);
155 
156                 if (JFS_IP(inode)->fileset == FILESYSTEM_I) {
157                         truncate_inode_pages(&inode->i_data, 0);
158 
159                         if (test_cflag(COMMIT_Freewmap, inode))
160                                 jfs_free_zero_link(inode);
161 
162                         diFree(inode);
163 
164                         /*
165                          * Free the inode from the quota allocation.
166                          */
167                         dquot_initialize(inode);
168                         dquot_free_inode(inode);
169                 }
170         } else {
171                 truncate_inode_pages(&inode->i_data, 0);
172         }
173         clear_inode(inode);
174         dquot_drop(inode);
175 }
176 
177 void jfs_dirty_inode(struct inode *inode, int flags)
178 {
179         static int noisy = 5;
180 
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
185                          */
186                         jfs_err("jfs_dirty_inode called on read-only volume");
187                         jfs_err("Is remount racy?");
188                         noisy--;
189                 }
190                 return;
191         }
192 
193         set_cflag(COMMIT_Dirty, inode);
194 }
195 
196 int jfs_get_block(struct inode *ip, sector_t lblock,
197                   struct buffer_head *bh_result, int create)
198 {
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;
205 
206         /*
207          * Take appropriate lock on inode
208          */
209         if (create)
210                 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
211         else
212                 IREAD_LOCK(ip, RDWRLOCK_NORMAL);
213 
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)
219                                 /*
220                                  * Allocated but not recorded, read treats
221                                  * this as a hole
222                                  */
223                                 goto unlock;
224 #ifdef _JFS_4K
225                         XADoffset(&xad, lblock64);
226                         XADlength(&xad, xlen);
227                         XADaddress(&xad, xaddr);
228 #else                           /* _JFS_4K */
229                         /*
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?
233                          */
234                         BUG();
235 #endif                          /* _JFS_4K */
236                         rc = extRecord(ip, &xad);
237                         if (rc)
238                                 goto unlock;
239                         set_buffer_new(bh_result);
240                 }
241 
242                 map_bh(bh_result, ip->i_sb, xaddr);
243                 bh_result->b_size = xlen << ip->i_blkbits;
244                 goto unlock;
245         }
246         if (!create)
247                 goto unlock;
248 
249         /*
250          * Allocate a new block
251          */
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;
258 
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;
262 
263 #else                           /* _JFS_4K */
264         /*
265          * We need to do whatever it takes to keep all but the last buffers
266          * in 4K pages - see jfs_write.c
267          */
268         BUG();
269 #endif                          /* _JFS_4K */
270 
271       unlock:
272         /*
273          * Release lock on inode
274          */
275         if (create)
276                 IWRITE_UNLOCK(ip);
277         else
278                 IREAD_UNLOCK(ip);
279         return rc;
280 }
281 
282 static int jfs_writepage(struct page *page, struct writeback_control *wbc)
283 {
284         return block_write_full_page(page, jfs_get_block, wbc);
285 }
286 
287 static int jfs_writepages(struct address_space *mapping,
288                         struct writeback_control *wbc)
289 {
290         return mpage_writepages(mapping, wbc, jfs_get_block);
291 }
292 
293 static int jfs_readpage(struct file *file, struct page *page)
294 {
295         return mpage_readpage(page, jfs_get_block);
296 }
297 
298 static int jfs_readpages(struct file *file, struct address_space *mapping,
299                 struct list_head *pages, unsigned nr_pages)
300 {
301         return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
302 }
303 
304 static void jfs_write_failed(struct address_space *mapping, loff_t to)
305 {
306         struct inode *inode = mapping->host;
307 
308         if (to > inode->i_size) {
309                 truncate_pagecache(inode, inode->i_size);
310                 jfs_truncate(inode);
311         }
312 }
313 
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)
317 {
318         int ret;
319 
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);
324 
325         return ret;
326 }
327 
328 static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
329 {
330         return generic_block_bmap(mapping, block, jfs_get_block);
331 }
332 
333 static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb,
334         const struct iovec *iov, loff_t offset, unsigned long nr_segs)
335 {
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;
340 
341         ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
342                                  jfs_get_block);
343 
344         /*
345          * In case of error extending write may have instantiated a few
346          * blocks outside i_size. Trim these off again.
347          */
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);
351 
352                 if (end > isize)
353                         jfs_write_failed(mapping, end);
354         }
355 
356         return ret;
357 }
358 
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,
368 };
369 
370 /*
371  * Guts of jfs_truncate.  Called with locks already held.  Can be called
372  * with directory for truncating directory index table.
373  */
374 void jfs_truncate_nolock(struct inode *ip, loff_t length)
375 {
376         loff_t newsize;
377         tid_t tid;
378 
379         ASSERT(length >= 0);
380 
381         if (test_cflag(COMMIT_Nolink, ip)) {
382                 xtTruncate(0, ip, length, COMMIT_WMAP);
383                 return;
384         }
385 
386         do {
387                 tid = txBegin(ip->i_sb, 0);
388 
389                 /*
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
394                  */
395                 mutex_lock(&JFS_IP(ip)->commit_mutex);
396 
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;
403                 }
404 
405                 ip->i_mtime = ip->i_ctime = CURRENT_TIME;
406                 mark_inode_dirty(ip);
407 
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 */
412 }
413 
414 void jfs_truncate(struct inode *ip)
415 {
416         jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
417 
418         nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
419 
420         IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
421         jfs_truncate_nolock(ip, ip->i_size);
422         IWRITE_UNLOCK(ip);
423 }
424 

~ [ source navigation ] ~ [ diff markup ] ~ [ identifier search ] ~

kernel.org | git.kernel.org | LWN.net | Project Home | Wiki (Japanese) | Wiki (English) | SVN repository | Mail admin

Linux® is a registered trademark of Linus Torvalds in the United States and other countries.
TOMOYO® is a registered trademark of NTT DATA CORPORATION.

osdn.jp