This is a note to let you know that I've just added the patch titled
ext4: using nofail preallocation in ext4_es_insert_extent()
to the 5.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
ext4-using-nofail-preallocation-in-ext4_es_insert_ex.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit b59d92a4166924e458b87567de310bbd5c2f4bd2
Author: Baokun Li <libaokun1@xxxxxxxxxx>
Date: Mon Apr 24 11:38:42 2023 +0800
ext4: using nofail preallocation in ext4_es_insert_extent()
[ Upstream commit 2a69c450083db164596c75c0f5b4d9c4c0e18eba ]
Similar to in ext4_es_insert_delayed_block(), we use preallocations that
do not fail to avoid inconsistencies, but we do not care about es that are
not must be kept, and we return 0 even if such es memory allocation fails.
Suggested-by: Jan Kara <jack@xxxxxxx>
Signed-off-by: Baokun Li <libaokun1@xxxxxxxxxx>
Reviewed-by: Jan Kara <jack@xxxxxxx>
Link: https://lore.kernel.org/r/20230424033846.4732-9-libaokun1@xxxxxxxxxx
Signed-off-by: Theodore Ts'o <tytso@xxxxxxx>
Stable-dep-of: 8e387c89e96b ("ext4: make sure allocate pending entry not fail")
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
diff --git a/fs/ext4/extents_status.c b/fs/ext4/extents_status.c
index fea538a66a16e..c4922b8c9d333 100644
--- a/fs/ext4/extents_status.c
+++ b/fs/ext4/extents_status.c
@@ -832,8 +832,11 @@ int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
{
struct extent_status newes;
ext4_lblk_t end = lblk + len - 1;
- int err = 0;
+ int err1 = 0;
+ int err2 = 0;
struct ext4_sb_info *sbi = EXT4_SB(inode->i_sb);
+ struct extent_status *es1 = NULL;
+ struct extent_status *es2 = NULL;
es_debug("add [%u/%u) %llu %x to extent status tree of inode %lu\n",
lblk, len, pblk, status, inode->i_ino);
@@ -858,29 +861,40 @@ int ext4_es_insert_extent(struct inode *inode, ext4_lblk_t lblk,
ext4_es_insert_extent_check(inode, &newes);
+retry:
+ if (err1 && !es1)
+ es1 = __es_alloc_extent(true);
+ if ((err1 || err2) && !es2)
+ es2 = __es_alloc_extent(true);
write_lock(&EXT4_I(inode)->i_es_lock);
- err = __es_remove_extent(inode, lblk, end, NULL, NULL);
- if (err != 0)
+
+ err1 = __es_remove_extent(inode, lblk, end, NULL, es1);
+ if (err1 != 0)
+ goto error;
+
+ err2 = __es_insert_extent(inode, &newes, es2);
+ if (err2 == -ENOMEM && !ext4_es_must_keep(&newes))
+ err2 = 0;
+ if (err2 != 0)
goto error;
-retry:
- err = __es_insert_extent(inode, &newes, NULL);
- if (err == -ENOMEM && __es_shrink(EXT4_SB(inode->i_sb),
- 128, EXT4_I(inode)))
- goto retry;
- if (err == -ENOMEM && !ext4_es_must_keep(&newes))
- err = 0;
if (sbi->s_cluster_ratio > 1 && test_opt(inode->i_sb, DELALLOC) &&
(status & EXTENT_STATUS_WRITTEN ||
status & EXTENT_STATUS_UNWRITTEN))
__revise_pending(inode, lblk, len);
+ /* es is pre-allocated but not used, free it. */
+ if (es1 && !es1->es_len)
+ __es_free_extent(es1);
+ if (es2 && !es2->es_len)
+ __es_free_extent(es2);
error:
write_unlock(&EXT4_I(inode)->i_es_lock);
+ if (err1 || err2)
+ goto retry;
ext4_es_print_tree(inode);
-
- return err;
+ return 0;
}
/*
