ext4: check return value of ext4_get_block() in ext4_load_tail_bh()

ext4_load_tail_bh() ignores the return value of ext4_get_block(), so an
I/O or allocation failure is silently discarded. buffer_mapped(bh) stays
false and the function returns NULL, which callers such as
ext4_block_do_zero_range() treat as "nothing to do" and return success.
This can mask real failures during zero-range, truncate, or punch-hole
operations, potentially exposing stale data if the block was not
actually a hole and needed zeroing. So propagate the error to the
callers.

Signed-off-by: Zhang Yi <yi.zhang@huawei.com>
Reviewed-by: Jan Kara <jack@suse.cz>
Link: https://patch.msgid.link/20260714080044.4038124-4-yi.zhang@huaweicloud.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

0 files changed, 0 insertions, 0 deletions