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609c5e0081
In ext4_readdir(), page_cache_sync_readahead() is used to readahead mapped physical blocks. With LBS support, this can lead to a negative right shift. To fix this, the page index is now calculated by first converting the physical block number (pblk) to a file position (pos) before converting it to a page index. Also, the correct number of pages to readahead is now passed. Signed-off-by: Baokun Li <libaokun1@huawei.com> Reviewed-by: Zhang Yi <yi.zhang@huawei.com> Reviewed-by: Jan Kara <jack@suse.cz> Reviewed-by: Pankaj Raghav <p.raghav@samsung.com> Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com> Message-ID: <20251121090654.631996-9-libaokun@huaweicloud.com> Signed-off-by: Theodore Ts'o <tytso@mit.edu>