5.4-stable review patch. If anyone has any objections, please let me know.
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From: Baokun Li libaokun1@huawei.com
[ 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@suse.cz Signed-off-by: Baokun Li libaokun1@huawei.com Reviewed-by: Jan Kara jack@suse.cz Link: https://lore.kernel.org/r/20230424033846.4732-8-libaokun1@huawei.com Signed-off-by: Theodore Ts'o tytso@mit.edu Stable-dep-of: 8e387c89e96b ("ext4: make sure allocate pending entry not fail") Signed-off-by: Sasha Levin sashal@kernel.org --- fs/ext4/extents_status.c | 33 ++++++++++++++++++++++----------- 1 file changed, 22 insertions(+), 11 deletions(-)
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; }
/*