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erofs: fix fsdax partition offset handling

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After seeking time on testing today upstream fsdax, I found it
actually doesn't work well as below:

[  186.492983] ------------[ cut here ]------------
[  186.493629] WARNING: CPU: 1 PID: 205 at fs/iomap/iter.c:33 iomap_iter+0x2f6/0x310

The problem is that m_dax_part_off should be applied to physical
addresses and very sorry about that I didn't catch this eariler.

Anyway, let's fix it up now. Also, I need to find a way to set up
a standalone testcase to look after this later.

Link: https://lore.kernel.org/r/20220113051845.244461-1-hsiangkao@linux.alibaba.com
Fixes: de2051147771 ("fsdax: shift partition offset handling into the file systems")
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Chao Yu <chao@kernel.org>
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
Gao Xiang 2022-01-13 13:18:45 +08:00
parent e783362eb5
commit e33f42b20b
1 changed files with 4 additions and 4 deletions
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8
fs/erofs/data.c
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@ -252,12 +252,10 @@ static int erofs_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
return ret;
iomap->offset = map.m_la;
if (flags & IOMAP_DAX) {
if (flags & IOMAP_DAX)
iomap->dax_dev = mdev.m_daxdev;
iomap->offset += mdev.m_dax_part_off;
} else {
else
iomap->bdev = mdev.m_bdev;
}
iomap->length = map.m_llen;
iomap->flags = 0;
iomap->private = NULL;
@ -284,6 +282,8 @@ static int erofs_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
} else {
iomap->type = IOMAP_MAPPED;
iomap->addr = mdev.m_pa;
if (flags & IOMAP_DAX)
iomap->addr += mdev.m_dax_part_off;
}
return 0;
}