This is a note to let you know that I've just added the patch titled
ext4: using nofail preallocation in ext4_es_insert_delayed_block()
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_de.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 96f4593003293d3c5a8053fbd20b091b9e0c5db7
Author: Baokun Li <libaokun1@xxxxxxxxxx>
Date: Mon Apr 24 11:38:41 2023 +0800
ext4: using nofail preallocation in ext4_es_insert_delayed_block()
[ Upstream commit 4a2d98447b37bcb68a7f06a1078edcb4f7e6ce7e ]
Similar to in ext4_es_remove_extent(), we use a no-fail preallocation
to avoid inconsistencies, except that here we may have to preallocate
two extent_status.
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/20230424033846.4732-8-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 854d865e9bfa2..fea538a66a16e 100644
--- a/fs/ext4/extents_status.c
+++ b/fs/ext4/extents_status.c
@@ -1992,7 +1992,10 @@ int ext4_es_insert_delayed_block(struct inode *inode, ext4_lblk_t lblk,
bool allocated)
{
struct extent_status newes;
- int err = 0;
+ int err1 = 0;
+ int err2 = 0;
+ struct extent_status *es1 = NULL;
+ struct extent_status *es2 = NULL;
es_debug("add [%u/1) delayed to extent status tree of inode %lu\n",
lblk, inode->i_ino);
@@ -2004,29 +2007,37 @@ int ext4_es_insert_delayed_block(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, lblk, NULL, NULL);
- if (err != 0)
+ err1 = __es_remove_extent(inode, lblk, lblk, NULL, es1);
+ if (err1 != 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 != 0)
+
+ err2 = __es_insert_extent(inode, &newes, es2);
+ if (err2 != 0)
goto error;
if (allocated)
__insert_pending(inode, lblk);
+ /* 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);
ext4_print_pending_tree(inode);
-
- return err;
+ return 0;
}
/*
