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btrfs: Drop EXTENT_UPTODATE check in hole punching and direct locking

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In these instances, we are trying to determine if a page has been accessed
since we began the operation for the sake of retry.  This is easily
accomplished by doing a gang lookup in the page mapping radix tree, and it
saves us the dependency on the flag (so that we might eventually delete
it).

btrfs_page_exists_in_range borrows heavily from find_get_page, replacing
the radix tree look up with a gang lookup of 1, so that we can find the
next highest page >= index and see if it falls into our lock range.

Signed-off-by: Chris Mason <clm@fb.com>
Signed-off-by: Alex Gartrell <agartrell@fb.com>
This commit is contained in:
Alex Gartrell
2014-05-20 13:07:56 -07:00
committed by Chris Mason
parent 0e378df15c
commit fc4adbff82
3 changed files with 71 additions and 7 deletions
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4
fs/btrfs/file.c
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@@ -2266,9 +2266,7 @@ static int btrfs_punch_hole(struct inode *inode, loff_t offset, loff_t len)
if ((!ordered ||
(ordered->file_offset + ordered->len <= lockstart ||
ordered->file_offset > lockend)) &&
!test_range_bit(&BTRFS_I(inode)->io_tree, lockstart,
lockend, EXTENT_UPTODATE, 0,
cached_state)) {
!btrfs_page_exists_in_range(inode, lockstart, lockend)) {
if (ordered)
btrfs_put_ordered_extent(ordered);
break;