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Linux/fs/ext4/file.c

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  1 /*
  2  *  linux/fs/ext4/file.c
  3  *
  4  * Copyright (C) 1992, 1993, 1994, 1995
  5  * Remy Card (card@masi.ibp.fr)
  6  * Laboratoire MASI - Institut Blaise Pascal
  7  * Universite Pierre et Marie Curie (Paris VI)
  8  *
  9  *  from
 10  *
 11  *  linux/fs/minix/file.c
 12  *
 13  *  Copyright (C) 1991, 1992  Linus Torvalds
 14  *
 15  *  ext4 fs regular file handling primitives
 16  *
 17  *  64-bit file support on 64-bit platforms by Jakub Jelinek
 18  *      (jj@sunsite.ms.mff.cuni.cz)
 19  */
 20 
 21 #include <linux/time.h>
 22 #include <linux/fs.h>
 23 #include <linux/jbd2.h>
 24 #include <linux/mount.h>
 25 #include <linux/path.h>
 26 #include <linux/aio.h>
 27 #include <linux/quotaops.h>
 28 #include <linux/pagevec.h>
 29 #include "ext4.h"
 30 #include "ext4_jbd2.h"
 31 #include "xattr.h"
 32 #include "acl.h"
 33 
 34 /*
 35  * Called when an inode is released. Note that this is different
 36  * from ext4_file_open: open gets called at every open, but release
 37  * gets called only when /all/ the files are closed.
 38  */
 39 static int ext4_release_file(struct inode *inode, struct file *filp)
 40 {
 41         if (ext4_test_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE)) {
 42                 ext4_alloc_da_blocks(inode);
 43                 ext4_clear_inode_state(inode, EXT4_STATE_DA_ALLOC_CLOSE);
 44         }
 45         /* if we are the last writer on the inode, drop the block reservation */
 46         if ((filp->f_mode & FMODE_WRITE) &&
 47                         (atomic_read(&inode->i_writecount) == 1) &&
 48                         !EXT4_I(inode)->i_reserved_data_blocks)
 49         {
 50                 down_write(&EXT4_I(inode)->i_data_sem);
 51                 ext4_discard_preallocations(inode);
 52                 up_write(&EXT4_I(inode)->i_data_sem);
 53         }
 54         if (is_dx(inode) && filp->private_data)
 55                 ext4_htree_free_dir_info(filp->private_data);
 56 
 57         return 0;
 58 }
 59 
 60 void ext4_unwritten_wait(struct inode *inode)
 61 {
 62         wait_queue_head_t *wq = ext4_ioend_wq(inode);
 63 
 64         wait_event(*wq, (atomic_read(&EXT4_I(inode)->i_unwritten) == 0));
 65 }
 66 
 67 /*
 68  * This tests whether the IO in question is block-aligned or not.
 69  * Ext4 utilizes unwritten extents when hole-filling during direct IO, and they
 70  * are converted to written only after the IO is complete.  Until they are
 71  * mapped, these blocks appear as holes, so dio_zero_block() will assume that
 72  * it needs to zero out portions of the start and/or end block.  If 2 AIO
 73  * threads are at work on the same unwritten block, they must be synchronized
 74  * or one thread will zero the other's data, causing corruption.
 75  */
 76 static int
 77 ext4_unaligned_aio(struct inode *inode, const struct iovec *iov,
 78                    unsigned long nr_segs, loff_t pos)
 79 {
 80         struct super_block *sb = inode->i_sb;
 81         int blockmask = sb->s_blocksize - 1;
 82         size_t count = iov_length(iov, nr_segs);
 83         loff_t final_size = pos + count;
 84 
 85         if (pos >= i_size_read(inode))
 86                 return 0;
 87 
 88         if ((pos & blockmask) || (final_size & blockmask))
 89                 return 1;
 90 
 91         return 0;
 92 }
 93 
 94 static ssize_t
 95 ext4_file_dio_write(struct kiocb *iocb, const struct iovec *iov,
 96                     unsigned long nr_segs, loff_t pos)
 97 {
 98         struct file *file = iocb->ki_filp;
 99         struct inode *inode = file->f_mapping->host;
100         struct blk_plug plug;
101         int unaligned_aio = 0;
102         ssize_t ret;
103         int overwrite = 0;
104         size_t length = iov_length(iov, nr_segs);
105 
106         if (ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
107             !is_sync_kiocb(iocb))
108                 unaligned_aio = ext4_unaligned_aio(inode, iov, nr_segs, pos);
109 
110         /* Unaligned direct AIO must be serialized; see comment above */
111         if (unaligned_aio) {
112                 mutex_lock(ext4_aio_mutex(inode));
113                 ext4_unwritten_wait(inode);
114         }
115 
116         BUG_ON(iocb->ki_pos != pos);
117 
118         mutex_lock(&inode->i_mutex);
119         blk_start_plug(&plug);
120 
121         iocb->private = &overwrite;
122 
123         /* check whether we do a DIO overwrite or not */
124         if (ext4_should_dioread_nolock(inode) && !unaligned_aio &&
125             !file->f_mapping->nrpages && pos + length <= i_size_read(inode)) {
126                 struct ext4_map_blocks map;
127                 unsigned int blkbits = inode->i_blkbits;
128                 int err, len;
129 
130                 map.m_lblk = pos >> blkbits;
131                 map.m_len = (EXT4_BLOCK_ALIGN(pos + length, blkbits) >> blkbits)
132                         - map.m_lblk;
133                 len = map.m_len;
134 
135                 err = ext4_map_blocks(NULL, inode, &map, 0);
136                 /*
137                  * 'err==len' means that all of blocks has been preallocated no
138                  * matter they are initialized or not.  For excluding
139                  * uninitialized extents, we need to check m_flags.  There are
140                  * two conditions that indicate for initialized extents.
141                  * 1) If we hit extent cache, EXT4_MAP_MAPPED flag is returned;
142                  * 2) If we do a real lookup, non-flags are returned.
143                  * So we should check these two conditions.
144                  */
145                 if (err == len && (map.m_flags & EXT4_MAP_MAPPED))
146                         overwrite = 1;
147         }
148 
149         ret = __generic_file_aio_write(iocb, iov, nr_segs);
150         mutex_unlock(&inode->i_mutex);
151 
152         if (ret > 0) {
153                 ssize_t err;
154 
155                 err = generic_write_sync(file, iocb->ki_pos - ret, ret);
156                 if (err < 0)
157                         ret = err;
158         }
159         blk_finish_plug(&plug);
160 
161         if (unaligned_aio)
162                 mutex_unlock(ext4_aio_mutex(inode));
163 
164         return ret;
165 }
166 
167 static ssize_t
168 ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
169                 unsigned long nr_segs, loff_t pos)
170 {
171         struct inode *inode = file_inode(iocb->ki_filp);
172         ssize_t ret;
173 
174         /*
175          * If we have encountered a bitmap-format file, the size limit
176          * is smaller than s_maxbytes, which is for extent-mapped files.
177          */
178 
179         if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
180                 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
181                 size_t length = iov_length(iov, nr_segs);
182 
183                 if ((pos > sbi->s_bitmap_maxbytes ||
184                     (pos == sbi->s_bitmap_maxbytes && length > 0)))
185                         return -EFBIG;
186 
187                 if (pos + length > sbi->s_bitmap_maxbytes) {
188                         nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
189                                               sbi->s_bitmap_maxbytes - pos);
190                 }
191         }
192 
193         if (unlikely(iocb->ki_filp->f_flags & O_DIRECT))
194                 ret = ext4_file_dio_write(iocb, iov, nr_segs, pos);
195         else
196                 ret = generic_file_aio_write(iocb, iov, nr_segs, pos);
197 
198         return ret;
199 }
200 
201 static const struct vm_operations_struct ext4_file_vm_ops = {
202         .fault          = filemap_fault,
203         .map_pages      = filemap_map_pages,
204         .page_mkwrite   = ext4_page_mkwrite,
205         .remap_pages    = generic_file_remap_pages,
206 };
207 
208 static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
209 {
210         struct address_space *mapping = file->f_mapping;
211 
212         if (!mapping->a_ops->readpage)
213                 return -ENOEXEC;
214         file_accessed(file);
215         vma->vm_ops = &ext4_file_vm_ops;
216         return 0;
217 }
218 
219 static int ext4_file_open(struct inode * inode, struct file * filp)
220 {
221         struct super_block *sb = inode->i_sb;
222         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
223         struct vfsmount *mnt = filp->f_path.mnt;
224         struct path path;
225         char buf[64], *cp;
226 
227         if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) &&
228                      !(sb->s_flags & MS_RDONLY))) {
229                 sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED;
230                 /*
231                  * Sample where the filesystem has been mounted and
232                  * store it in the superblock for sysadmin convenience
233                  * when trying to sort through large numbers of block
234                  * devices or filesystem images.
235                  */
236                 memset(buf, 0, sizeof(buf));
237                 path.mnt = mnt;
238                 path.dentry = mnt->mnt_root;
239                 cp = d_path(&path, buf, sizeof(buf));
240                 if (!IS_ERR(cp)) {
241                         handle_t *handle;
242                         int err;
243 
244                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
245                         if (IS_ERR(handle))
246                                 return PTR_ERR(handle);
247                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
248                         if (err) {
249                                 ext4_journal_stop(handle);
250                                 return err;
251                         }
252                         strlcpy(sbi->s_es->s_last_mounted, cp,
253                                 sizeof(sbi->s_es->s_last_mounted));
254                         ext4_handle_dirty_super(handle, sb);
255                         ext4_journal_stop(handle);
256                 }
257         }
258         /*
259          * Set up the jbd2_inode if we are opening the inode for
260          * writing and the journal is present
261          */
262         if (filp->f_mode & FMODE_WRITE) {
263                 int ret = ext4_inode_attach_jinode(inode);
264                 if (ret < 0)
265                         return ret;
266         }
267         return dquot_file_open(inode, filp);
268 }
269 
270 /*
271  * Here we use ext4_map_blocks() to get a block mapping for a extent-based
272  * file rather than ext4_ext_walk_space() because we can introduce
273  * SEEK_DATA/SEEK_HOLE for block-mapped and extent-mapped file at the same
274  * function.  When extent status tree has been fully implemented, it will
275  * track all extent status for a file and we can directly use it to
276  * retrieve the offset for SEEK_DATA/SEEK_HOLE.
277  */
278 
279 /*
280  * When we retrieve the offset for SEEK_DATA/SEEK_HOLE, we would need to
281  * lookup page cache to check whether or not there has some data between
282  * [startoff, endoff] because, if this range contains an unwritten extent,
283  * we determine this extent as a data or a hole according to whether the
284  * page cache has data or not.
285  */
286 static int ext4_find_unwritten_pgoff(struct inode *inode,
287                                      int whence,
288                                      struct ext4_map_blocks *map,
289                                      loff_t *offset)
290 {
291         struct pagevec pvec;
292         unsigned int blkbits;
293         pgoff_t index;
294         pgoff_t end;
295         loff_t endoff;
296         loff_t startoff;
297         loff_t lastoff;
298         int found = 0;
299 
300         blkbits = inode->i_sb->s_blocksize_bits;
301         startoff = *offset;
302         lastoff = startoff;
303         endoff = (loff_t)(map->m_lblk + map->m_len) << blkbits;
304 
305         index = startoff >> PAGE_CACHE_SHIFT;
306         end = endoff >> PAGE_CACHE_SHIFT;
307 
308         pagevec_init(&pvec, 0);
309         do {
310                 int i, num;
311                 unsigned long nr_pages;
312 
313                 num = min_t(pgoff_t, end - index, PAGEVEC_SIZE);
314                 nr_pages = pagevec_lookup(&pvec, inode->i_mapping, index,
315                                           (pgoff_t)num);
316                 if (nr_pages == 0) {
317                         if (whence == SEEK_DATA)
318                                 break;
319 
320                         BUG_ON(whence != SEEK_HOLE);
321                         /*
322                          * If this is the first time to go into the loop and
323                          * offset is not beyond the end offset, it will be a
324                          * hole at this offset
325                          */
326                         if (lastoff == startoff || lastoff < endoff)
327                                 found = 1;
328                         break;
329                 }
330 
331                 /*
332                  * If this is the first time to go into the loop and
333                  * offset is smaller than the first page offset, it will be a
334                  * hole at this offset.
335                  */
336                 if (lastoff == startoff && whence == SEEK_HOLE &&
337                     lastoff < page_offset(pvec.pages[0])) {
338                         found = 1;
339                         break;
340                 }
341 
342                 for (i = 0; i < nr_pages; i++) {
343                         struct page *page = pvec.pages[i];
344                         struct buffer_head *bh, *head;
345 
346                         /*
347                          * If the current offset is not beyond the end of given
348                          * range, it will be a hole.
349                          */
350                         if (lastoff < endoff && whence == SEEK_HOLE &&
351                             page->index > end) {
352                                 found = 1;
353                                 *offset = lastoff;
354                                 goto out;
355                         }
356 
357                         lock_page(page);
358 
359                         if (unlikely(page->mapping != inode->i_mapping)) {
360                                 unlock_page(page);
361                                 continue;
362                         }
363 
364                         if (!page_has_buffers(page)) {
365                                 unlock_page(page);
366                                 continue;
367                         }
368 
369                         if (page_has_buffers(page)) {
370                                 lastoff = page_offset(page);
371                                 bh = head = page_buffers(page);
372                                 do {
373                                         if (buffer_uptodate(bh) ||
374                                             buffer_unwritten(bh)) {
375                                                 if (whence == SEEK_DATA)
376                                                         found = 1;
377                                         } else {
378                                                 if (whence == SEEK_HOLE)
379                                                         found = 1;
380                                         }
381                                         if (found) {
382                                                 *offset = max_t(loff_t,
383                                                         startoff, lastoff);
384                                                 unlock_page(page);
385                                                 goto out;
386                                         }
387                                         lastoff += bh->b_size;
388                                         bh = bh->b_this_page;
389                                 } while (bh != head);
390                         }
391 
392                         lastoff = page_offset(page) + PAGE_SIZE;
393                         unlock_page(page);
394                 }
395 
396                 /*
397                  * The no. of pages is less than our desired, that would be a
398                  * hole in there.
399                  */
400                 if (nr_pages < num && whence == SEEK_HOLE) {
401                         found = 1;
402                         *offset = lastoff;
403                         break;
404                 }
405 
406                 index = pvec.pages[i - 1]->index + 1;
407                 pagevec_release(&pvec);
408         } while (index <= end);
409 
410 out:
411         pagevec_release(&pvec);
412         return found;
413 }
414 
415 /*
416  * ext4_seek_data() retrieves the offset for SEEK_DATA.
417  */
418 static loff_t ext4_seek_data(struct file *file, loff_t offset, loff_t maxsize)
419 {
420         struct inode *inode = file->f_mapping->host;
421         struct ext4_map_blocks map;
422         struct extent_status es;
423         ext4_lblk_t start, last, end;
424         loff_t dataoff, isize;
425         int blkbits;
426         int ret = 0;
427 
428         mutex_lock(&inode->i_mutex);
429 
430         isize = i_size_read(inode);
431         if (offset >= isize) {
432                 mutex_unlock(&inode->i_mutex);
433                 return -ENXIO;
434         }
435 
436         blkbits = inode->i_sb->s_blocksize_bits;
437         start = offset >> blkbits;
438         last = start;
439         end = isize >> blkbits;
440         dataoff = offset;
441 
442         do {
443                 map.m_lblk = last;
444                 map.m_len = end - last + 1;
445                 ret = ext4_map_blocks(NULL, inode, &map, 0);
446                 if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) {
447                         if (last != start)
448                                 dataoff = (loff_t)last << blkbits;
449                         break;
450                 }
451 
452                 /*
453                  * If there is a delay extent at this offset,
454                  * it will be as a data.
455                  */
456                 ext4_es_find_delayed_extent_range(inode, last, last, &es);
457                 if (es.es_len != 0 && in_range(last, es.es_lblk, es.es_len)) {
458                         if (last != start)
459                                 dataoff = (loff_t)last << blkbits;
460                         break;
461                 }
462 
463                 /*
464                  * If there is a unwritten extent at this offset,
465                  * it will be as a data or a hole according to page
466                  * cache that has data or not.
467                  */
468                 if (map.m_flags & EXT4_MAP_UNWRITTEN) {
469                         int unwritten;
470                         unwritten = ext4_find_unwritten_pgoff(inode, SEEK_DATA,
471                                                               &map, &dataoff);
472                         if (unwritten)
473                                 break;
474                 }
475 
476                 last++;
477                 dataoff = (loff_t)last << blkbits;
478         } while (last <= end);
479 
480         mutex_unlock(&inode->i_mutex);
481 
482         if (dataoff > isize)
483                 return -ENXIO;
484 
485         return vfs_setpos(file, dataoff, maxsize);
486 }
487 
488 /*
489  * ext4_seek_hole() retrieves the offset for SEEK_HOLE.
490  */
491 static loff_t ext4_seek_hole(struct file *file, loff_t offset, loff_t maxsize)
492 {
493         struct inode *inode = file->f_mapping->host;
494         struct ext4_map_blocks map;
495         struct extent_status es;
496         ext4_lblk_t start, last, end;
497         loff_t holeoff, isize;
498         int blkbits;
499         int ret = 0;
500 
501         mutex_lock(&inode->i_mutex);
502 
503         isize = i_size_read(inode);
504         if (offset >= isize) {
505                 mutex_unlock(&inode->i_mutex);
506                 return -ENXIO;
507         }
508 
509         blkbits = inode->i_sb->s_blocksize_bits;
510         start = offset >> blkbits;
511         last = start;
512         end = isize >> blkbits;
513         holeoff = offset;
514 
515         do {
516                 map.m_lblk = last;
517                 map.m_len = end - last + 1;
518                 ret = ext4_map_blocks(NULL, inode, &map, 0);
519                 if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) {
520                         last += ret;
521                         holeoff = (loff_t)last << blkbits;
522                         continue;
523                 }
524 
525                 /*
526                  * If there is a delay extent at this offset,
527                  * we will skip this extent.
528                  */
529                 ext4_es_find_delayed_extent_range(inode, last, last, &es);
530                 if (es.es_len != 0 && in_range(last, es.es_lblk, es.es_len)) {
531                         last = es.es_lblk + es.es_len;
532                         holeoff = (loff_t)last << blkbits;
533                         continue;
534                 }
535 
536                 /*
537                  * If there is a unwritten extent at this offset,
538                  * it will be as a data or a hole according to page
539                  * cache that has data or not.
540                  */
541                 if (map.m_flags & EXT4_MAP_UNWRITTEN) {
542                         int unwritten;
543                         unwritten = ext4_find_unwritten_pgoff(inode, SEEK_HOLE,
544                                                               &map, &holeoff);
545                         if (!unwritten) {
546                                 last += ret;
547                                 holeoff = (loff_t)last << blkbits;
548                                 continue;
549                         }
550                 }
551 
552                 /* find a hole */
553                 break;
554         } while (last <= end);
555 
556         mutex_unlock(&inode->i_mutex);
557 
558         if (holeoff > isize)
559                 holeoff = isize;
560 
561         return vfs_setpos(file, holeoff, maxsize);
562 }
563 
564 /*
565  * ext4_llseek() handles both block-mapped and extent-mapped maxbytes values
566  * by calling generic_file_llseek_size() with the appropriate maxbytes
567  * value for each.
568  */
569 loff_t ext4_llseek(struct file *file, loff_t offset, int whence)
570 {
571         struct inode *inode = file->f_mapping->host;
572         loff_t maxbytes;
573 
574         if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
575                 maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
576         else
577                 maxbytes = inode->i_sb->s_maxbytes;
578 
579         switch (whence) {
580         case SEEK_SET:
581         case SEEK_CUR:
582         case SEEK_END:
583                 return generic_file_llseek_size(file, offset, whence,
584                                                 maxbytes, i_size_read(inode));
585         case SEEK_DATA:
586                 return ext4_seek_data(file, offset, maxbytes);
587         case SEEK_HOLE:
588                 return ext4_seek_hole(file, offset, maxbytes);
589         }
590 
591         return -EINVAL;
592 }
593 
594 const struct file_operations ext4_file_operations = {
595         .llseek         = ext4_llseek,
596         .read           = do_sync_read,
597         .write          = do_sync_write,
598         .aio_read       = generic_file_aio_read,
599         .aio_write      = ext4_file_write,
600         .unlocked_ioctl = ext4_ioctl,
601 #ifdef CONFIG_COMPAT
602         .compat_ioctl   = ext4_compat_ioctl,
603 #endif
604         .mmap           = ext4_file_mmap,
605         .open           = ext4_file_open,
606         .release        = ext4_release_file,
607         .fsync          = ext4_sync_file,
608         .splice_read    = generic_file_splice_read,
609         .splice_write   = generic_file_splice_write,
610         .fallocate      = ext4_fallocate,
611 };
612 
613 const struct inode_operations ext4_file_inode_operations = {
614         .setattr        = ext4_setattr,
615         .getattr        = ext4_getattr,
616         .setxattr       = generic_setxattr,
617         .getxattr       = generic_getxattr,
618         .listxattr      = ext4_listxattr,
619         .removexattr    = generic_removexattr,
620         .get_acl        = ext4_get_acl,
621         .set_acl        = ext4_set_acl,
622         .fiemap         = ext4_fiemap,
623 };
624 
625 

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