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authorJ. Bruce Fields <bfields@citi.umich.edu>2010-03-04 12:03:16 -0500
committerJ. Bruce Fields <bfields@citi.umich.edu>2010-03-04 12:04:51 -0500
commit4ea41e2de5bba756858bb40f964e3490b6d1a25c (patch)
tree51a688be321dd42f80d8a0c966eb6a60408d50b3 /mm/truncate.c
parent8d75da8afd068fa58b35e69c7c8c46770d9e7a98 (diff)
parent398007f863a4af2b4a5a07219c5a617f1a098115 (diff)
Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs into for-2.6.34-incoming
Resolve merge conflict in fs/xfs/linux-2.6/xfs_export.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 342deee22684..e87e37244829 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