Patch "f2fs: fix error path of __f2fs_build_free_nids" has been added to the 6.6-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    f2fs: fix error path of __f2fs_build_free_nids

to the 6.6-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:
     f2fs-fix-error-path-of-__f2fs_build_free_nids.patch
and it can be found in the queue-6.6 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 5bd02f1102474cacda8734481d728f86736145a8
Author: Zhiguo Niu <zhiguo.niu@xxxxxxxxxx>
Date:   Mon Oct 16 19:27:31 2023 +0800

    f2fs: fix error path of __f2fs_build_free_nids
    
    [ Upstream commit a5e80e18f268ea7c7a36bc4159de0deb3b5a2171 ]
    
    If NAT is corrupted, let scan_nat_page() return EFSCORRUPTED, so that,
    caller can set SBI_NEED_FSCK flag into checkpoint for later repair by
    fsck.
    
    Also, this patch introduces a new fscorrupted error flag, and in above
    scenario, it will persist the error flag into superblock synchronously
    to avoid it has no luck to trigger a checkpoint to record SBI_NEED_FSCK
    
    Signed-off-by: Zhiguo Niu <zhiguo.niu@xxxxxxxxxx>
    Signed-off-by: Chao Yu <chao@xxxxxxxxxx>
    Signed-off-by: Jaegeuk Kim <jaegeuk@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index ee2e1dd64f256..248764badcde8 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -2389,7 +2389,7 @@ static int scan_nat_page(struct f2fs_sb_info *sbi,
 		blk_addr = le32_to_cpu(nat_blk->entries[i].block_addr);
 
 		if (blk_addr == NEW_ADDR)
-			return -EINVAL;
+			return -EFSCORRUPTED;
 
 		if (blk_addr == NULL_ADDR) {
 			add_free_nid(sbi, start_nid, true, true);
@@ -2504,7 +2504,14 @@ static int __f2fs_build_free_nids(struct f2fs_sb_info *sbi,
 
 			if (ret) {
 				f2fs_up_read(&nm_i->nat_tree_lock);
-				f2fs_err(sbi, "NAT is corrupt, run fsck to fix it");
+
+				if (ret == -EFSCORRUPTED) {
+					f2fs_err(sbi, "NAT is corrupt, run fsck to fix it");
+					set_sbi_flag(sbi, SBI_NEED_FSCK);
+					f2fs_handle_error(sbi,
+						ERROR_INCONSISTENT_NAT);
+				}
+
 				return ret;
 			}
 		}
diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h
index a82a4bb6ce68b..cf1adceb02697 100644
--- a/include/linux/f2fs_fs.h
+++ b/include/linux/f2fs_fs.h
@@ -104,6 +104,7 @@ enum f2fs_error {
 	ERROR_CORRUPTED_VERITY_XATTR,
 	ERROR_CORRUPTED_XATTR,
 	ERROR_INVALID_NODE_REFERENCE,
+	ERROR_INCONSISTENT_NAT,
 	ERROR_MAX,
 };