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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 = iocb->private;
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         /* check whether we do a DIO overwrite or not */
122         if (ext4_should_dioread_nolock(inode) && !unaligned_aio &&
123             !file->f_mapping->nrpages && pos + length <= i_size_read(inode)) {
124                 struct ext4_map_blocks map;
125                 unsigned int blkbits = inode->i_blkbits;
126                 int err, len;
127 
128                 map.m_lblk = pos >> blkbits;
129                 map.m_len = (EXT4_BLOCK_ALIGN(pos + length, blkbits) >> blkbits)
130                         - map.m_lblk;
131                 len = map.m_len;
132 
133                 err = ext4_map_blocks(NULL, inode, &map, 0);
134                 /*
135                  * 'err==len' means that all of blocks has been preallocated no
136                  * matter they are initialized or not.  For excluding
137                  * uninitialized extents, we need to check m_flags.  There are
138                  * two conditions that indicate for initialized extents.
139                  * 1) If we hit extent cache, EXT4_MAP_MAPPED flag is returned;
140                  * 2) If we do a real lookup, non-flags are returned.
141                  * So we should check these two conditions.
142                  */
143                 if (err == len && (map.m_flags & EXT4_MAP_MAPPED))
144                         *overwrite = 1;
145         }
146 
147         ret = __generic_file_aio_write(iocb, iov, nr_segs, &iocb->ki_pos);
148         mutex_unlock(&inode->i_mutex);
149 
150         if (ret > 0) {
151                 ssize_t err;
152 
153                 err = generic_write_sync(file, iocb->ki_pos - ret, ret);
154                 if (err < 0 && ret > 0)
155                         ret = err;
156         }
157         blk_finish_plug(&plug);
158 
159         if (unaligned_aio)
160                 mutex_unlock(ext4_aio_mutex(inode));
161 
162         return ret;
163 }
164 
165 static ssize_t
166 ext4_file_write(struct kiocb *iocb, const struct iovec *iov,
167                 unsigned long nr_segs, loff_t pos)
168 {
169         struct inode *inode = file_inode(iocb->ki_filp);
170         ssize_t ret;
171         int overwrite = 0;
172 
173         /*
174          * If we have encountered a bitmap-format file, the size limit
175          * is smaller than s_maxbytes, which is for extent-mapped files.
176          */
177 
178         if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS))) {
179                 struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
180                 size_t length = iov_length(iov, nr_segs);
181 
182                 if ((pos > sbi->s_bitmap_maxbytes ||
183                     (pos == sbi->s_bitmap_maxbytes && length > 0)))
184                         return -EFBIG;
185 
186                 if (pos + length > sbi->s_bitmap_maxbytes) {
187                         nr_segs = iov_shorten((struct iovec *)iov, nr_segs,
188                                               sbi->s_bitmap_maxbytes - pos);
189                 }
190         }
191 
192         iocb->private = &overwrite;
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         .page_mkwrite   = ext4_page_mkwrite,
204         .remap_pages    = generic_file_remap_pages,
205 };
206 
207 static int ext4_file_mmap(struct file *file, struct vm_area_struct *vma)
208 {
209         struct address_space *mapping = file->f_mapping;
210 
211         if (!mapping->a_ops->readpage)
212                 return -ENOEXEC;
213         file_accessed(file);
214         vma->vm_ops = &ext4_file_vm_ops;
215         return 0;
216 }
217 
218 static int ext4_file_open(struct inode * inode, struct file * filp)
219 {
220         struct super_block *sb = inode->i_sb;
221         struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
222         struct vfsmount *mnt = filp->f_path.mnt;
223         struct path path;
224         char buf[64], *cp;
225 
226         if (unlikely(!(sbi->s_mount_flags & EXT4_MF_MNTDIR_SAMPLED) &&
227                      !(sb->s_flags & MS_RDONLY))) {
228                 sbi->s_mount_flags |= EXT4_MF_MNTDIR_SAMPLED;
229                 /*
230                  * Sample where the filesystem has been mounted and
231                  * store it in the superblock for sysadmin convenience
232                  * when trying to sort through large numbers of block
233                  * devices or filesystem images.
234                  */
235                 memset(buf, 0, sizeof(buf));
236                 path.mnt = mnt;
237                 path.dentry = mnt->mnt_root;
238                 cp = d_path(&path, buf, sizeof(buf));
239                 if (!IS_ERR(cp)) {
240                         handle_t *handle;
241                         int err;
242 
243                         handle = ext4_journal_start_sb(sb, EXT4_HT_MISC, 1);
244                         if (IS_ERR(handle))
245                                 return PTR_ERR(handle);
246                         err = ext4_journal_get_write_access(handle, sbi->s_sbh);
247                         if (err) {
248                                 ext4_journal_stop(handle);
249                                 return err;
250                         }
251                         strlcpy(sbi->s_es->s_last_mounted, cp,
252                                 sizeof(sbi->s_es->s_last_mounted));
253                         ext4_handle_dirty_super(handle, sb);
254                         ext4_journal_stop(handle);
255                 }
256         }
257         /*
258          * Set up the jbd2_inode if we are opening the inode for
259          * writing and the journal is present
260          */
261         if (filp->f_mode & FMODE_WRITE) {
262                 int ret = ext4_inode_attach_jinode(inode);
263                 if (ret < 0)
264                         return ret;
265         }
266         return dquot_file_open(inode, filp);
267 }
268 
269 /*
270  * Here we use ext4_map_blocks() to get a block mapping for a extent-based
271  * file rather than ext4_ext_walk_space() because we can introduce
272  * SEEK_DATA/SEEK_HOLE for block-mapped and extent-mapped file at the same
273  * function.  When extent status tree has been fully implemented, it will
274  * track all extent status for a file and we can directly use it to
275  * retrieve the offset for SEEK_DATA/SEEK_HOLE.
276  */
277 
278 /*
279  * When we retrieve the offset for SEEK_DATA/SEEK_HOLE, we would need to
280  * lookup page cache to check whether or not there has some data between
281  * [startoff, endoff] because, if this range contains an unwritten extent,
282  * we determine this extent as a data or a hole according to whether the
283  * page cache has data or not.
284  */
285 static int ext4_find_unwritten_pgoff(struct inode *inode,
286                                      int whence,
287                                      struct ext4_map_blocks *map,
288                                      loff_t *offset)
289 {
290         struct pagevec pvec;
291         unsigned int blkbits;
292         pgoff_t index;
293         pgoff_t end;
294         loff_t endoff;
295         loff_t startoff;
296         loff_t lastoff;
297         int found = 0;
298 
299         blkbits = inode->i_sb->s_blocksize_bits;
300         startoff = *offset;
301         lastoff = startoff;
302         endoff = (loff_t)(map->m_lblk + map->m_len) << blkbits;
303 
304         index = startoff >> PAGE_CACHE_SHIFT;
305         end = endoff >> PAGE_CACHE_SHIFT;
306 
307         pagevec_init(&pvec, 0);
308         do {
309                 int i, num;
310                 unsigned long nr_pages;
311 
312                 num = min_t(pgoff_t, end - index, PAGEVEC_SIZE);
313                 nr_pages = pagevec_lookup(&pvec, inode->i_mapping, index,
314                                           (pgoff_t)num);
315                 if (nr_pages == 0) {
316                         if (whence == SEEK_DATA)
317                                 break;
318 
319                         BUG_ON(whence != SEEK_HOLE);
320                         /*
321                          * If this is the first time to go into the loop and
322                          * offset is not beyond the end offset, it will be a
323                          * hole at this offset
324                          */
325                         if (lastoff == startoff || lastoff < endoff)
326                                 found = 1;
327                         break;
328                 }
329 
330                 /*
331                  * If this is the first time to go into the loop and
332                  * offset is smaller than the first page offset, it will be a
333                  * hole at this offset.
334                  */
335                 if (lastoff == startoff && whence == SEEK_HOLE &&
336                     lastoff < page_offset(pvec.pages[0])) {
337                         found = 1;
338                         break;
339                 }
340 
341                 for (i = 0; i < nr_pages; i++) {
342                         struct page *page = pvec.pages[i];
343                         struct buffer_head *bh, *head;
344 
345                         /*
346                          * If the current offset is not beyond the end of given
347                          * range, it will be a hole.
348                          */
349                         if (lastoff < endoff && whence == SEEK_HOLE &&
350                             page->index > end) {
351                                 found = 1;
352                                 *offset = lastoff;
353                                 goto out;
354                         }
355 
356                         lock_page(page);
357 
358                         if (unlikely(page->mapping != inode->i_mapping)) {
359                                 unlock_page(page);
360                                 continue;
361                         }
362 
363                         if (!page_has_buffers(page)) {
364                                 unlock_page(page);
365                                 continue;
366                         }
367 
368                         if (page_has_buffers(page)) {
369                                 lastoff = page_offset(page);
370                                 bh = head = page_buffers(page);
371                                 do {
372                                         if (buffer_uptodate(bh) ||
373                                             buffer_unwritten(bh)) {
374                                                 if (whence == SEEK_DATA)
375                                                         found = 1;
376                                         } else {
377                                                 if (whence == SEEK_HOLE)
378                                                         found = 1;
379                                         }
380                                         if (found) {
381                                                 *offset = max_t(loff_t,
382                                                         startoff, lastoff);
383                                                 unlock_page(page);
384                                                 goto out;
385                                         }
386                                         lastoff += bh->b_size;
387                                         bh = bh->b_this_page;
388                                 } while (bh != head);
389                         }
390 
391                         lastoff = page_offset(page) + PAGE_SIZE;
392                         unlock_page(page);
393                 }
394 
395                 /*
396                  * The no. of pages is less than our desired, that would be a
397                  * hole in there.
398                  */
399                 if (nr_pages < num && whence == SEEK_HOLE) {
400                         found = 1;
401                         *offset = lastoff;
402                         break;
403                 }
404 
405                 index = pvec.pages[i - 1]->index + 1;
406                 pagevec_release(&pvec);
407         } while (index <= end);
408 
409 out:
410         pagevec_release(&pvec);
411         return found;
412 }
413 
414 /*
415  * ext4_seek_data() retrieves the offset for SEEK_DATA.
416  */
417 static loff_t ext4_seek_data(struct file *file, loff_t offset, loff_t maxsize)
418 {
419         struct inode *inode = file->f_mapping->host;
420         struct ext4_map_blocks map;
421         struct extent_status es;
422         ext4_lblk_t start, last, end;
423         loff_t dataoff, isize;
424         int blkbits;
425         int ret = 0;
426 
427         mutex_lock(&inode->i_mutex);
428 
429         isize = i_size_read(inode);
430         if (offset >= isize) {
431                 mutex_unlock(&inode->i_mutex);
432                 return -ENXIO;
433         }
434 
435         blkbits = inode->i_sb->s_blocksize_bits;
436         start = offset >> blkbits;
437         last = start;
438         end = isize >> blkbits;
439         dataoff = offset;
440 
441         do {
442                 map.m_lblk = last;
443                 map.m_len = end - last + 1;
444                 ret = ext4_map_blocks(NULL, inode, &map, 0);
445                 if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) {
446                         if (last != start)
447                                 dataoff = (loff_t)last << blkbits;
448                         break;
449                 }
450 
451                 /*
452                  * If there is a delay extent at this offset,
453                  * it will be as a data.
454                  */
455                 ext4_es_find_delayed_extent_range(inode, last, last, &es);
456                 if (es.es_len != 0 && in_range(last, es.es_lblk, es.es_len)) {
457                         if (last != start)
458                                 dataoff = (loff_t)last << blkbits;
459                         break;
460                 }
461 
462                 /*
463                  * If there is a unwritten extent at this offset,
464                  * it will be as a data or a hole according to page
465                  * cache that has data or not.
466                  */
467                 if (map.m_flags & EXT4_MAP_UNWRITTEN) {
468                         int unwritten;
469                         unwritten = ext4_find_unwritten_pgoff(inode, SEEK_DATA,
470                                                               &map, &dataoff);
471                         if (unwritten)
472                                 break;
473                 }
474 
475                 last++;
476                 dataoff = (loff_t)last << blkbits;
477         } while (last <= end);
478 
479         mutex_unlock(&inode->i_mutex);
480 
481         if (dataoff > isize)
482                 return -ENXIO;
483 
484         return vfs_setpos(file, dataoff, maxsize);
485 }
486 
487 /*
488  * ext4_seek_hole() retrieves the offset for SEEK_HOLE.
489  */
490 static loff_t ext4_seek_hole(struct file *file, loff_t offset, loff_t maxsize)
491 {
492         struct inode *inode = file->f_mapping->host;
493         struct ext4_map_blocks map;
494         struct extent_status es;
495         ext4_lblk_t start, last, end;
496         loff_t holeoff, isize;
497         int blkbits;
498         int ret = 0;
499 
500         mutex_lock(&inode->i_mutex);
501 
502         isize = i_size_read(inode);
503         if (offset >= isize) {
504                 mutex_unlock(&inode->i_mutex);
505                 return -ENXIO;
506         }
507 
508         blkbits = inode->i_sb->s_blocksize_bits;
509         start = offset >> blkbits;
510         last = start;
511         end = isize >> blkbits;
512         holeoff = offset;
513 
514         do {
515                 map.m_lblk = last;
516                 map.m_len = end - last + 1;
517                 ret = ext4_map_blocks(NULL, inode, &map, 0);
518                 if (ret > 0 && !(map.m_flags & EXT4_MAP_UNWRITTEN)) {
519                         last += ret;
520                         holeoff = (loff_t)last << blkbits;
521                         continue;
522                 }
523 
524                 /*
525                  * If there is a delay extent at this offset,
526                  * we will skip this extent.
527                  */
528                 ext4_es_find_delayed_extent_range(inode, last, last, &es);
529                 if (es.es_len != 0 && in_range(last, es.es_lblk, es.es_len)) {
530                         last = es.es_lblk + es.es_len;
531                         holeoff = (loff_t)last << blkbits;
532                         continue;
533                 }
534 
535                 /*
536                  * If there is a unwritten extent at this offset,
537                  * it will be as a data or a hole according to page
538                  * cache that has data or not.
539                  */
540                 if (map.m_flags & EXT4_MAP_UNWRITTEN) {
541                         int unwritten;
542                         unwritten = ext4_find_unwritten_pgoff(inode, SEEK_HOLE,
543                                                               &map, &holeoff);
544                         if (!unwritten) {
545                                 last += ret;
546                                 holeoff = (loff_t)last << blkbits;
547                                 continue;
548                         }
549                 }
550 
551                 /* find a hole */
552                 break;
553         } while (last <= end);
554 
555         mutex_unlock(&inode->i_mutex);
556 
557         if (holeoff > isize)
558                 holeoff = isize;
559 
560         return vfs_setpos(file, holeoff, maxsize);
561 }
562 
563 /*
564  * ext4_llseek() handles both block-mapped and extent-mapped maxbytes values
565  * by calling generic_file_llseek_size() with the appropriate maxbytes
566  * value for each.
567  */
568 loff_t ext4_llseek(struct file *file, loff_t offset, int whence)
569 {
570         struct inode *inode = file->f_mapping->host;
571         loff_t maxbytes;
572 
573         if (!(ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS)))
574                 maxbytes = EXT4_SB(inode->i_sb)->s_bitmap_maxbytes;
575         else
576                 maxbytes = inode->i_sb->s_maxbytes;
577 
578         switch (whence) {
579         case SEEK_SET:
580         case SEEK_CUR:
581         case SEEK_END:
582                 return generic_file_llseek_size(file, offset, whence,
583                                                 maxbytes, i_size_read(inode));
584         case SEEK_DATA:
585                 return ext4_seek_data(file, offset, maxbytes);
586         case SEEK_HOLE:
587                 return ext4_seek_hole(file, offset, maxbytes);
588         }
589 
590         return -EINVAL;
591 }
592 
593 const struct file_operations ext4_file_operations = {
594         .llseek         = ext4_llseek,
595         .read           = do_sync_read,
596         .write          = do_sync_write,
597         .aio_read       = generic_file_aio_read,
598         .aio_write      = ext4_file_write,
599         .unlocked_ioctl = ext4_ioctl,
600 #ifdef CONFIG_COMPAT
601         .compat_ioctl   = ext4_compat_ioctl,
602 #endif
603         .mmap           = ext4_file_mmap,
604         .open           = ext4_file_open,
605         .release        = ext4_release_file,
606         .fsync          = ext4_sync_file,
607         .splice_read    = generic_file_splice_read,
608         .splice_write   = generic_file_splice_write,
609         .fallocate      = ext4_fallocate,
610 };
611 
612 const struct inode_operations ext4_file_inode_operations = {
613         .setattr        = ext4_setattr,
614         .getattr        = ext4_getattr,
615         .setxattr       = generic_setxattr,
616         .getxattr       = generic_getxattr,
617         .listxattr      = ext4_listxattr,
618         .removexattr    = generic_removexattr,
619         .get_acl        = ext4_get_acl,
620         .fiemap         = ext4_fiemap,
621 };
622 
623 

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