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[RFC,1/8] ext4: Stop searching if PA doesn't satisfy non-extent file

Message ID b4a86ddab5c5ed9495170f3367bdf22027583988.1661632343.git.ojaswin@linux.ibm.com (mailing list archive)
State New, archived
Headers show
Series ext4: Convert inode preallocation list to an rbtree | expand

Commit Message

Ojaswin Mujoo Aug. 28, 2022, 6:46 a.m. UTC 
If we come across a PA that matches the logical offset but is unable to
satisfy a non-extent file due to its physical start being higher than
that supported by non extent files, then simply stop searching for
another PA and break out of loop. This is because, since PAs don't
overlap, we won't be able to find another inode PA which can satisfy the
original request.

Signed-off-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Reviewed-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
---
 fs/ext4/mballoc.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)
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Patch

diff --git a/fs/ext4/mballoc.c b/fs/ext4/mballoc.c
index b02f71f07289..17bf71a3b471 100644
--- a/fs/ext4/mballoc.c
+++ b/fs/ext4/mballoc.c
@@ -4418,8 +4418,13 @@  ext4_mb_use_preallocated(struct ext4_allocation_context *ac)
 		/* non-extent files can't have physical blocks past 2^32 */
 		if (!(ext4_test_inode_flag(ac->ac_inode, EXT4_INODE_EXTENTS)) &&
 		    (pa->pa_pstart + EXT4_C2B(sbi, pa->pa_len) >
-		     EXT4_MAX_BLOCK_FILE_PHYS))
-			continue;
+		     EXT4_MAX_BLOCK_FILE_PHYS)) {
+			/*
+			 * Since PAs don't overlap, we won't find any
+			 * other PA to satisfy this.
+			 */
+			break;
+		}
 
 		/* found preallocated blocks, use them */
 		spin_lock(&pa->pa_lock);