From: Jaegeuk Kim jaegeuk@kernel.org
[ Upstream commit 9d5c4f5c7a2c7677e1b3942772122b032c265aae ]
Assuming the disk layout as below,
disk0: 0 --- 0x00035abfff disk1: 0x00035ac000 --- 0x00037abfff disk2: 0x00037ac000 --- 0x00037ebfff
and we want to read data from offset=13568 having len=128 across the block devices, we can illustrate the block addresses like below.
0 .. 0x00037ac000 ------------------- 0x00037ebfff, 0x00037ec000 ------- | ^ ^ ^ | fofs 0 13568 13568+128 | ------------------------------------------------------ | LBA 0x37e8aa9 0x37ebfa9 0x37ec029 --- map 0x3caa9 0x3ffa9
In this example, we should give the relative map of the target block device ranging from 0x3caa9 to 0x3ffa9 where the length should be calculated by 0x37ebfff + 1 - 0x37ebfa9.
In the below equation, however, map->m_pblk was supposed to be the original address instead of the one from the target block address.
- map->m_len = min(map->m_len, dev->end_blk + 1 - map->m_pblk);
Cc: stable@vger.kernel.org Fixes: 71f2c8206202 ("f2fs: multidevice: support direct IO") Reviewed-by: Chao Yu chao@kernel.org Signed-off-by: Jaegeuk Kim jaegeuk@kernel.org Signed-off-by: Sasha Levin sashal@kernel.org --- fs/f2fs/data.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/fs/f2fs/data.c b/fs/f2fs/data.c index dc1ffdcbae889..3f67b04fdb747 100644 --- a/fs/f2fs/data.c +++ b/fs/f2fs/data.c @@ -1486,8 +1486,8 @@ static bool f2fs_map_blocks_cached(struct inode *inode, struct f2fs_dev_info *dev = &sbi->devs[bidx];
map->m_bdev = dev->bdev; - map->m_pblk -= dev->start_blk; map->m_len = min(map->m_len, dev->end_blk + 1 - map->m_pblk); + map->m_pblk -= dev->start_blk; } else { map->m_bdev = inode->i_sb->s_bdev; }