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Btrfs: Search for all ordered extents that could span across a page 

In subpagesize-blocksize scenario it is not sufficient to search using the
first byte of the page to make sure that there are no ordered extents
present across the page. Fix this.

Signed-off-by: Chandan Rajendra <chandan@linux.vnet.ibm.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Chandan Rajendra 2016-01-21 15:55:58 +05:30 committed by David Sterba
parent d0b7da88f6
commit dbfdb6d1b3
2 changed files with 20 additions and 8 deletions
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3
fs/btrfs/extent_io.c
View File

@ -3186,7 +3186,8 @@ static int __extent_read_full_page(struct extent_io_tree *tree,
while (1) {
lock_extent(tree, start, end);
ordered = btrfs_lookup_ordered_extent(inode, start);
ordered = btrfs_lookup_ordered_range(inode, start,
PAGE_CACHE_SIZE);
if (!ordered)
break;
unlock_extent(tree, start, end);

25
fs/btrfs/inode.c
View File

@ -2002,7 +2002,8 @@ again:
if (PagePrivate2(page))
goto out;
ordered = btrfs_lookup_ordered_extent(inode, page_start);
ordered = btrfs_lookup_ordered_range(inode, page_start,
PAGE_CACHE_SIZE);
if (ordered) {
unlock_extent_cached(&BTRFS_I(inode)->io_tree, page_start,
page_end, &cached_state, GFP_NOFS);
@ -8683,6 +8684,8 @@ static void btrfs_invalidatepage(struct page *page, unsigned int offset,
struct extent_state *cached_state = NULL;
u64 page_start = page_offset(page);
u64 page_end = page_start + PAGE_CACHE_SIZE - 1;
u64 start;
u64 end;
int inode_evicting = inode->i_state & I_FREEING;
/*
@ -8702,14 +8705,18 @@ static void btrfs_invalidatepage(struct page *page, unsigned int offset,
if (!inode_evicting)
lock_extent_bits(tree, page_start, page_end, &cached_state);
ordered = btrfs_lookup_ordered_extent(inode, page_start);
again:
start = page_start;
ordered = btrfs_lookup_ordered_range(inode, start,
page_end - start + 1);
if (ordered) {
end = min(page_end, ordered->file_offset + ordered->len - 1);
/*
* IO on this page will never be started, so we need
* to account for any ordered extents now
*/
if (!inode_evicting)
clear_extent_bit(tree, page_start, page_end,
clear_extent_bit(tree, start, end,
EXTENT_DIRTY | EXTENT_DELALLOC |
EXTENT_LOCKED | EXTENT_DO_ACCOUNTING |
EXTENT_DEFRAG, 1, 0, &cached_state,
@ -8726,22 +8733,26 @@ static void btrfs_invalidatepage(struct page *page, unsigned int offset,
spin_lock_irq(&tree->lock);
set_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags);
new_len = page_start - ordered->file_offset;
new_len = start - ordered->file_offset;
if (new_len < ordered->truncated_len)
ordered->truncated_len = new_len;
spin_unlock_irq(&tree->lock);
if (btrfs_dec_test_ordered_pending(inode, &ordered,
page_start,
PAGE_CACHE_SIZE, 1))
start,
end - start + 1, 1))
btrfs_finish_ordered_io(ordered);
}
btrfs_put_ordered_extent(ordered);
if (!inode_evicting) {
cached_state = NULL;
lock_extent_bits(tree, page_start, page_end,
lock_extent_bits(tree, start, end,
&cached_state);
}
start = end + 1;
if (start < page_end)
goto again;
}
/*