From: Chi Zhiling For exFAT filesystems with 4MB read_ahead_size, removing the storage device during read operations can delay EIO error reporting by several minutes. This occurs because the read-ahead implementation in mpage doesn't handle errors. Another reason for the delay is that the filesystem requires metadata to issue file read request. When the storage device is removed, the metadata buffers are invalidated, causing mpage to repeatedly attempt to fetch metadata during each get_block call. The original purpose of this patch is terminate read ahead when we fail to get metadata, to make the patch more generic, implement it by checking folio status, instead of checking the return of get_block(). Signed-off-by: Chi Zhiling --- fs/mpage.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/fs/mpage.c b/fs/mpage.c index c5fd821fd30e..b6510b8dfa2b 100644 --- a/fs/mpage.c +++ b/fs/mpage.c @@ -369,6 +369,9 @@ void mpage_readahead(struct readahead_control *rac, get_block_t get_block) args.folio = folio; args.nr_pages = readahead_count(rac); args.bio = do_mpage_readpage(&args); + if (!folio_test_locked(folio) && + !folio_test_uptodate(folio)) + break; } if (args.bio) mpage_bio_submit_read(args.bio); -- 2.43.0