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authorH. Peter Anvin <hpa@zytor.com>2010-02-22 19:20:34 -0500
committerH. Peter Anvin <hpa@zytor.com>2010-02-22 19:20:34 -0500
commitd02e30c31c57683a66ed68a1bcff900ca78f6d56 (patch)
treec3ce99a00061bcc1199b50fa838147d876c56717 /mm/truncate.c
parent0fdc7a8022c3eaff6b5ee27ffb9e913e5e58d8e9 (diff)
parentaef55d4922e62a0d887e60d87319f3718aec6ced (diff)
Merge branch 'x86/irq' into x86/apic
Merge reason: Conflicts in arch/x86/kernel/apic/io_apic.c Resolved Conflicts: arch/x86/kernel/apic/io_apic.c Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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