From: Baokun Li Use the EXT4_PG_TO_LBLK() macro to convert folio indexes to blocks to avoid negative left shifts after supporting blocksize greater than PAGE_SIZE. Signed-off-by: Baokun Li Reviewed-by: Zhang Yi Reviewed-by: Jan Kara --- fs/ext4/inode.c | 7 +++---- 1 file changed, 3 insertions(+), 4 deletions(-) diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 1153a26ff963..80c2860abed2 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -1168,8 +1168,7 @@ int ext4_block_write_begin(handle_t *handle, struct folio *folio, unsigned block_start, block_end; sector_t block; int err = 0; - unsigned blocksize = inode->i_sb->s_blocksize; - unsigned bbits; + unsigned int blocksize = i_blocksize(inode); struct buffer_head *bh, *head, *wait[2]; int nr_wait = 0; int i; @@ -1178,12 +1177,12 @@ int ext4_block_write_begin(handle_t *handle, struct folio *folio, BUG_ON(!folio_test_locked(folio)); BUG_ON(to > folio_size(folio)); BUG_ON(from > to); + WARN_ON_ONCE(blocksize > folio_size(folio)); head = folio_buffers(folio); if (!head) head = create_empty_buffers(folio, blocksize, 0); - bbits = ilog2(blocksize); - block = (sector_t)folio->index << (PAGE_SHIFT - bbits); + block = EXT4_PG_TO_LBLK(inode, folio->index); for (bh = head, block_start = 0; bh != head || !block_start; block++, block_start = block_end, bh = bh->b_this_page) { -- 2.46.1