diff options
author | Ross Zwisler <ross.zwisler@linux.intel.com> | 2016-11-08 03:31:14 +0300 |
---|---|---|
committer | Dave Chinner <david@fromorbit.com> | 2016-11-08 03:31:14 +0300 |
commit | fa0d3fce7ceff0aae62f3e19678713bc5a7f3377 (patch) | |
tree | bc8d3241926aed790b10ae1a440f2c6298a6ae90 | |
parent | 547edce3ba234a5161c6e1f4389f4a0d2f8451aa (diff) | |
download | linux-fa0d3fce7ceff0aae62f3e19678713bc5a7f3377.tar.xz |
dax: remove buffer_size_valid()
Now that ext4 properly sets bh.b_size when we call get_block() for a hole,
rely on that value and remove the buffer_size_valid() sanity check.
Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Dave Chinner <david@fromorbit.com>
-rw-r--r-- | fs/dax.c | 22 |
1 files changed, 1 insertions, 21 deletions
@@ -123,19 +123,6 @@ static bool buffer_written(struct buffer_head *bh) return buffer_mapped(bh) && !buffer_unwritten(bh); } -/* - * When ext4 encounters a hole, it returns without modifying the buffer_head - * which means that we can't trust b_size. To cope with this, we set b_state - * to 0 before calling get_block and, if any bit is set, we know we can trust - * b_size. Unfortunate, really, since ext4 knows precisely how long a hole is - * and would save us time calling get_block repeatedly. - */ -static bool buffer_size_valid(struct buffer_head *bh) -{ - return bh->b_state != 0; -} - - static sector_t to_sector(const struct buffer_head *bh, const struct inode *inode) { @@ -177,8 +164,6 @@ static ssize_t dax_io(struct inode *inode, struct iov_iter *iter, rc = get_block(inode, block, bh, rw == WRITE); if (rc) break; - if (!buffer_size_valid(bh)) - bh->b_size = 1 << blkbits; bh_max = pos - first + bh->b_size; bdev = bh->b_bdev; /* @@ -1012,12 +997,7 @@ int dax_pmd_fault(struct vm_area_struct *vma, unsigned long address, bdev = bh.b_bdev; - /* - * If the filesystem isn't willing to tell us the length of a hole, - * just fall back to PTEs. Calling get_block 512 times in a loop - * would be silly. - */ - if (!buffer_size_valid(&bh) || bh.b_size < PMD_SIZE) { + if (bh.b_size < PMD_SIZE) { dax_pmd_dbg(&bh, address, "allocated block too small"); return VM_FAULT_FALLBACK; } |