From d1e18b8824dd50cff255e6cecf515ea598eaf9f0 Mon Sep 17 00:00:00 2001 From: Ritesh Harjani Date: Thu, 8 Oct 2020 20:32:48 +0530 Subject: [PATCH] ext4: fix bs < ps issue reported with dioread_nolock mount opt left shifting m_lblk by blkbits was causing value overflow and hence it was not able to convert unwritten to written extent. So, make sure we typecast it to loff_t before do left shift operation. Also in func ext4_convert_unwritten_io_end_vec(), make sure to initialize ret variable to avoid accidentally returning an uninitialized ret. This patch fixes the issue reported in ext4 for bs < ps with dioread_nolock mount option. Fixes: c8cc88163f40df39e50c ("ext4: Add support for blocksize < pagesize in dioread_nolock") Cc: stable@kernel.org Reported-by: Aneesh Kumar K.V Signed-off-by: Ritesh Harjani Reviewed-by: Jan Kara Link: https://lore.kernel.org/r/af902b5db99e8b73980c795d84ad7bb417487e76.1602168865.git.riteshh@linux.ibm.com Signed-off-by: Theodore Ts'o --- fs/ext4/extents.c | 2 +- fs/ext4/inode.c | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index 2baf0debd2b7..e46f3381ba4c 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -4769,7 +4769,7 @@ int ext4_convert_unwritten_extents(handle_t *handle, struct inode *inode, int ext4_convert_unwritten_io_end_vec(handle_t *handle, ext4_io_end_t *io_end) { - int ret, err = 0; + int ret = 0, err = 0; struct ext4_io_end_vec *io_end_vec; /* diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c index 2ac294fc2247..09096fe6170e 100644 --- a/fs/ext4/inode.c +++ b/fs/ext4/inode.c @@ -2258,7 +2258,7 @@ static int mpage_process_page(struct mpage_da_data *mpd, struct page *page, err = PTR_ERR(io_end_vec); goto out; } - io_end_vec->offset = mpd->map.m_lblk << blkbits; + io_end_vec->offset = (loff_t)mpd->map.m_lblk << blkbits; } *map_bh = true; goto out;