[PATCH 5.10 03/18] udf: Do not bother looking for prealloc extents if i_lenExtents matches i_size

Greg Kroah-Hartman
2022-12-19T19:27:54Z

From: Jan Kara <jack@suse.cz>

commit 6ad53f0f71c52871202a7bf096feb2c59db33fc5 upstream.

If rounded block-rounded i_lenExtents matches block rounded i_size,
there are no preallocation extents. Do not bother walking extent linked
list.

CC: stable@vger.kernel.org
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
fs/udf/truncate.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)

--- a/fs/udf/truncate.c
+++ b/fs/udf/truncate.c
@@ -127,9 +127,10 @@ void udf_discard_prealloc(struct inode *
uint64_t lbcount = 0;
int8_t etype = -1, netype;
struct udf_inode_info *iinfo = UDF_I(inode);
+ int bsize = 1 << inode->i_blkbits;

if (iinfo->i_alloc_type == ICBTAG_FLAG_AD_IN_ICB ||
- inode->i_size == iinfo->i_lenExtents)
+ ALIGN(inode->i_size, bsize) == ALIGN(iinfo->i_lenExtents, bsize))
return;

epos.block = iinfo->i_location;