This gets us support for non-discard efficient write of zeroes (e.g. NVMe)
and preparse for removing the discard_zeroes_data flag.
Also remove a pointless discard support check, which is done in
blkdev_issue_discard already.
Signed-off-by: Christoph Hellwig <h...@lst.de>
---
fs/block_dev.c | 16 +++++-----------
1 file changed, 5 insertions(+), 11 deletions(-)
diff --git a/fs/block_dev.c b/fs/block_dev.c
index 6128283b7830..5c701c16e8ff 100644
--- a/fs/block_dev.c
+++ b/fs/block_dev.c
@@ -2074,10 +2074,10 @@ static long blkdev_fallocate(struct file *file, int
mode, loff_t start,
loff_t len)
{
struct block_device *bdev = I_BDEV(bdev_file_inode(file));
- struct request_queue *q = bdev_get_queue(bdev);
struct address_space *mapping;
loff_t end = start + len - 1;
loff_t isize;
+ unsigned flags = 0;
int error;
/* Fail if we don't recognize the flags. */
@@ -2107,21 +2107,15 @@ static long blkdev_fallocate(struct file *file, int
mode, loff_t start,
truncate_inode_pages_range(mapping, start, end);
switch (mode) {
+ case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE:
+ flags = BLKDEV_ZERO_NOFALLBACK;
+ /*FALLTHRU*/
case FALLOC_FL_ZERO_RANGE:
case FALLOC_FL_ZERO_RANGE | FALLOC_FL_KEEP_SIZE:
error = blkdev_issue_zeroout(bdev, start >> 9, len >> 9,
- GFP_KERNEL, 0);
- break;
- case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE:
- /* Only punch if the device can do zeroing discard. */
- if (!blk_queue_discard(q) || !q->limits.discard_zeroes_data)
- return -EOPNOTSUPP;
- error = blkdev_issue_discard(bdev, start >> 9, len >> 9,
- GFP_KERNEL, 0);
+ GFP_KERNEL, flags);
break;
case FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE |
FALLOC_FL_NO_HIDE_STALE:
- if (!blk_queue_discard(q))
- return -EOPNOTSUPP;
error = blkdev_issue_discard(bdev, start >> 9, len >> 9,
GFP_KERNEL, 0);
break;
--
2.11.0
