提交 4d479cf0 编写于 作者: J Josef Bacik 提交者: Chris Mason

Btrfs: sectorsize align offsets in fiemap

We've been hitting BUG()'s in btrfs_cont_expand and btrfs_fallocate and anywhere
else that calls btrfs_get_extent while running xfstests 13 in a loop.  This is
because fiemap is calling btrfs_get_extent with non-sectorsize aligned offsets,
which will end up adding mappings that are not sectorsize aligned, which will
cause problems in some cases for subsequent calls to btrfs_get_extent for
similar areas that are sectorsize aligned.  With this patch I ran xfstests 13 in
a loop for a couple of hours and didn't hit the problem that I could previously
hit in at most 20 minutes.  Thanks,
Signed-off-by: NJosef Bacik <josef@redhat.com>
上级 f7d61dcd
......@@ -3366,6 +3366,9 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
return -ENOMEM;
path->leave_spinning = 1;
start = ALIGN(start, BTRFS_I(inode)->root->sectorsize);
len = ALIGN(len, BTRFS_I(inode)->root->sectorsize);
/*
* lookup the last file extent. We're not using i_size here
* because there might be preallocation past i_size
......@@ -3413,7 +3416,7 @@ int extent_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
lock_extent_bits(&BTRFS_I(inode)->io_tree, start, start + len, 0,
&cached_state, GFP_NOFS);
em = get_extent_skip_holes(inode, off, last_for_get_extent,
em = get_extent_skip_holes(inode, start, last_for_get_extent,
get_extent);
if (!em)
goto out;
......
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