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authorTakashi Iwai <tiwai@suse.de>2010-02-17 08:24:46 -0500
committerTakashi Iwai <tiwai@suse.de>2010-02-17 08:24:46 -0500
commit7fb3a069bc5d3577409c2ae89f89cd264ff85816 (patch)
tree7fe3ba3b95faeecb01e4feafb9288ef4b523c6b3 /mm/truncate.c
parent291186e049d7f8178ad31d43c38a53889f25d79e (diff)
parent9d3415a8cc76ff65c6602a121ac318432c5cd7ba (diff)
Merge branch 'fix/misc' into topic/misc
Conflicts: sound/pci/hda/patch_realtek.c
Diffstat (limited to 'mm/truncate.c')
-rw-r--r--mm/truncate.c30
1 files changed, 14 insertions, 16 deletions
diff --git a/mm/truncate.c b/mm/truncate.c
index 342deee2268..e87e3724482 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -522,22 +522,20 @@ EXPORT_SYMBOL_GPL(invalidate_inode_pages2);
522 */ 522 */
523void truncate_pagecache(struct inode *inode, loff_t old, loff_t new) 523void truncate_pagecache(struct inode *inode, loff_t old, loff_t new)
524{ 524{
525 if (new < old) { 525 struct address_space *mapping = inode->i_mapping;
526 struct address_space *mapping = inode->i_mapping; 526
527 527 /*
528 /* 528 * unmap_mapping_range is called twice, first simply for
529 * unmap_mapping_range is called twice, first simply for 529 * efficiency so that truncate_inode_pages does fewer
530 * efficiency so that truncate_inode_pages does fewer 530 * single-page unmaps. However after this first call, and
531 * single-page unmaps. However after this first call, and 531 * before truncate_inode_pages finishes, it is possible for
532 * before truncate_inode_pages finishes, it is possible for 532 * private pages to be COWed, which remain after
533 * private pages to be COWed, which remain after 533 * truncate_inode_pages finishes, hence the second
534 * truncate_inode_pages finishes, hence the second 534 * unmap_mapping_range call must be made for correctness.
535 * unmap_mapping_range call must be made for correctness. 535 */
536 */ 536 unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
537 unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1); 537 truncate_inode_pages(mapping, new);
538 truncate_inode_pages(mapping, new); 538 unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
539 unmap_mapping_range(mapping, new + PAGE_SIZE - 1, 0, 1);
540 }
541} 539}
542EXPORT_SYMBOL(truncate_pagecache); 540EXPORT_SYMBOL(truncate_pagecache);
543 541