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

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  1 // SPDX-License-Identifier: GPL-2.0-or-later
  2 /*
  3  *   Copyright (C) International Business Machines Corp., 2000-2004
  4  *   Portions Copyright (C) Christoph Hellwig, 2001-2002
  5  */
  6 
  7 #include <linux/fs.h>
  8 #include <linux/mpage.h>
  9 #include <linux/buffer_head.h>
 10 #include <linux/pagemap.h>
 11 #include <linux/quotaops.h>
 12 #include <linux/uio.h>
 13 #include <linux/writeback.h>
 14 #include "jfs_incore.h"
 15 #include "jfs_inode.h"
 16 #include "jfs_filsys.h"
 17 #include "jfs_imap.h"
 18 #include "jfs_extent.h"
 19 #include "jfs_unicode.h"
 20 #include "jfs_debug.h"
 21 #include "jfs_dmap.h"
 22 
 23 
 24 struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
 25 {
 26         struct inode *inode;
 27         int ret;
 28 
 29         inode = iget_locked(sb, ino);
 30         if (!inode)
 31                 return ERR_PTR(-ENOMEM);
 32         if (!(inode->i_state & I_NEW))
 33                 return inode;
 34 
 35         ret = diRead(inode);
 36         if (ret < 0) {
 37                 iget_failed(inode);
 38                 return ERR_PTR(ret);
 39         }
 40 
 41         if (S_ISREG(inode->i_mode)) {
 42                 inode->i_op = &jfs_file_inode_operations;
 43                 inode->i_fop = &jfs_file_operations;
 44                 inode->i_mapping->a_ops = &jfs_aops;
 45         } else if (S_ISDIR(inode->i_mode)) {
 46                 inode->i_op = &jfs_dir_inode_operations;
 47                 inode->i_fop = &jfs_dir_operations;
 48         } else if (S_ISLNK(inode->i_mode)) {
 49                 if (inode->i_size >= IDATASIZE) {
 50                         inode->i_op = &page_symlink_inode_operations;
 51                         inode_nohighmem(inode);
 52                         inode->i_mapping->a_ops = &jfs_aops;
 53                 } else {
 54                         inode->i_op = &jfs_fast_symlink_inode_operations;
 55                         inode->i_link = JFS_IP(inode)->i_inline;
 56                         /*
 57                          * The inline data should be null-terminated, but
 58                          * don't let on-disk corruption crash the kernel
 59                          */
 60                         inode->i_link[inode->i_size] = '\0';
 61                 }
 62         } else {
 63                 inode->i_op = &jfs_file_inode_operations;
 64                 init_special_inode(inode, inode->i_mode, inode->i_rdev);
 65         }
 66         unlock_new_inode(inode);
 67         return inode;
 68 }
 69 
 70 /*
 71  * Workhorse of both fsync & write_inode
 72  */
 73 int jfs_commit_inode(struct inode *inode, int wait)
 74 {
 75         int rc = 0;
 76         tid_t tid;
 77         static int noisy = 5;
 78 
 79         jfs_info("In jfs_commit_inode, inode = 0x%p", inode);
 80 
 81         /*
 82          * Don't commit if inode has been committed since last being
 83          * marked dirty, or if it has been deleted.
 84          */
 85         if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode))
 86                 return 0;
 87 
 88         if (isReadOnly(inode)) {
 89                 /* kernel allows writes to devices on read-only
 90                  * partitions and may think inode is dirty
 91                  */
 92                 if (!special_file(inode->i_mode) && noisy) {
 93                         jfs_err("jfs_commit_inode(0x%p) called on read-only volume",
 94                                 inode);
 95                         jfs_err("Is remount racy?");
 96                         noisy--;
 97                 }
 98                 return 0;
 99         }
100 
101         tid = txBegin(inode->i_sb, COMMIT_INODE);
102         mutex_lock(&JFS_IP(inode)->commit_mutex);
103 
104         /*
105          * Retest inode state after taking commit_mutex
106          */
107         if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
108                 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
109 
110         txEnd(tid);
111         mutex_unlock(&JFS_IP(inode)->commit_mutex);
112         return rc;
113 }
114 
115 int jfs_write_inode(struct inode *inode, struct writeback_control *wbc)
116 {
117         int wait = wbc->sync_mode == WB_SYNC_ALL;
118 
119         if (inode->i_nlink == 0)
120                 return 0;
121         /*
122          * If COMMIT_DIRTY is not set, the inode isn't really dirty.
123          * It has been committed since the last change, but was still
124          * on the dirty inode list.
125          */
126         if (!test_cflag(COMMIT_Dirty, inode)) {
127                 /* Make sure committed changes hit the disk */
128                 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
129                 return 0;
130         }
131 
132         if (jfs_commit_inode(inode, wait)) {
133                 jfs_err("jfs_write_inode: jfs_commit_inode failed!");
134                 return -EIO;
135         } else
136                 return 0;
137 }
138 
139 void jfs_evict_inode(struct inode *inode)
140 {
141         struct jfs_inode_info *ji = JFS_IP(inode);
142 
143         jfs_info("In jfs_evict_inode, inode = 0x%p", inode);
144 
145         if (!inode->i_nlink && !is_bad_inode(inode)) {
146                 dquot_initialize(inode);
147 
148                 if (JFS_IP(inode)->fileset == FILESYSTEM_I) {
149                         truncate_inode_pages_final(&inode->i_data);
150 
151                         if (test_cflag(COMMIT_Freewmap, inode))
152                                 jfs_free_zero_link(inode);
153 
154                         diFree(inode);
155 
156                         /*
157                          * Free the inode from the quota allocation.
158                          */
159                         dquot_free_inode(inode);
160                 }
161         } else {
162                 truncate_inode_pages_final(&inode->i_data);
163         }
164         clear_inode(inode);
165         dquot_drop(inode);
166 
167         BUG_ON(!list_empty(&ji->anon_inode_list));
168 
169         spin_lock_irq(&ji->ag_lock);
170         if (ji->active_ag != -1) {
171                 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
172                 atomic_dec(&bmap->db_active[ji->active_ag]);
173                 ji->active_ag = -1;
174         }
175         spin_unlock_irq(&ji->ag_lock);
176 }
177 
178 void jfs_dirty_inode(struct inode *inode, int flags)
179 {
180         static int noisy = 5;
181 
182         if (isReadOnly(inode)) {
183                 if (!special_file(inode->i_mode) && noisy) {
184                         /* kernel allows writes to devices on read-only
185                          * partitions and may try to mark inode dirty
186                          */
187                         jfs_err("jfs_dirty_inode called on read-only volume");
188                         jfs_err("Is remount racy?");
189                         noisy--;
190                 }
191                 return;
192         }
193 
194         set_cflag(COMMIT_Dirty, inode);
195 }
196 
197 int jfs_get_block(struct inode *ip, sector_t lblock,
198                   struct buffer_head *bh_result, int create)
199 {
200         s64 lblock64 = lblock;
201         int rc = 0;
202         xad_t xad;
203         s64 xaddr;
204         int xflag;
205         s32 xlen = bh_result->b_size >> ip->i_blkbits;
206 
207         /*
208          * Take appropriate lock on inode
209          */
210         if (create)
211                 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
212         else
213                 IREAD_LOCK(ip, RDWRLOCK_NORMAL);
214 
215         if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
216             (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
217             xaddr) {
218                 if (xflag & XAD_NOTRECORDED) {
219                         if (!create)
220                                 /*
221                                  * Allocated but not recorded, read treats
222                                  * this as a hole
223                                  */
224                                 goto unlock;
225 #ifdef _JFS_4K
226                         XADoffset(&xad, lblock64);
227                         XADlength(&xad, xlen);
228                         XADaddress(&xad, xaddr);
229 #else                           /* _JFS_4K */
230                         /*
231                          * As long as block size = 4K, this isn't a problem.
232                          * We should mark the whole page not ABNR, but how
233                          * will we know to mark the other blocks BH_New?
234                          */
235                         BUG();
236 #endif                          /* _JFS_4K */
237                         rc = extRecord(ip, &xad);
238                         if (rc)
239                                 goto unlock;
240                         set_buffer_new(bh_result);
241                 }
242 
243                 map_bh(bh_result, ip->i_sb, xaddr);
244                 bh_result->b_size = xlen << ip->i_blkbits;
245                 goto unlock;
246         }
247         if (!create)
248                 goto unlock;
249 
250         /*
251          * Allocate a new block
252          */
253 #ifdef _JFS_4K
254         if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
255                 goto unlock;
256         rc = extAlloc(ip, xlen, lblock64, &xad, false);
257         if (rc)
258                 goto unlock;
259 
260         set_buffer_new(bh_result);
261         map_bh(bh_result, ip->i_sb, addressXAD(&xad));
262         bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
263 
264 #else                           /* _JFS_4K */
265         /*
266          * We need to do whatever it takes to keep all but the last buffers
267          * in 4K pages - see jfs_write.c
268          */
269         BUG();
270 #endif                          /* _JFS_4K */
271 
272       unlock:
273         /*
274          * Release lock on inode
275          */
276         if (create)
277                 IWRITE_UNLOCK(ip);
278         else
279                 IREAD_UNLOCK(ip);
280         return rc;
281 }
282 
283 static int jfs_writepage(struct page *page, struct writeback_control *wbc)
284 {
285         return block_write_full_page(page, jfs_get_block, wbc);
286 }
287 
288 static int jfs_writepages(struct address_space *mapping,
289                         struct writeback_control *wbc)
290 {
291         return mpage_writepages(mapping, wbc, jfs_get_block);
292 }
293 
294 static int jfs_readpage(struct file *file, struct page *page)
295 {
296         return mpage_readpage(page, jfs_get_block);
297 }
298 
299 static int jfs_readpages(struct file *file, struct address_space *mapping,
300                 struct list_head *pages, unsigned nr_pages)
301 {
302         return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
303 }
304 
305 static void jfs_write_failed(struct address_space *mapping, loff_t to)
306 {
307         struct inode *inode = mapping->host;
308 
309         if (to > inode->i_size) {
310                 truncate_pagecache(inode, inode->i_size);
311                 jfs_truncate(inode);
312         }
313 }
314 
315 static int jfs_write_begin(struct file *file, struct address_space *mapping,
316                                 loff_t pos, unsigned len, unsigned flags,
317                                 struct page **pagep, void **fsdata)
318 {
319         int ret;
320 
321         ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
322                                 jfs_get_block);
323         if (unlikely(ret))
324                 jfs_write_failed(mapping, pos + len);
325 
326         return ret;
327 }
328 
329 static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
330 {
331         return generic_block_bmap(mapping, block, jfs_get_block);
332 }
333 
334 static ssize_t jfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
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         size_t count = iov_iter_count(iter);
340         ssize_t ret;
341 
342         ret = blockdev_direct_IO(iocb, inode, iter, 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(iov_iter_rw(iter) == WRITE && ret < 0)) {
349                 loff_t isize = i_size_read(inode);
350                 loff_t end = iocb->ki_pos + count;
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(ip);
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 

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