ext4: down i_data_sem only for read when walking tree for fiemap
Not sure why I put this in as down_write originally; all we are doing is walking the tree, nothing will change under us and concurrent reads should be no problem. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
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@ -3312,10 +3312,10 @@ int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
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* Walk the extent tree gathering extent information.
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* ext4_ext_fiemap_cb will push extents back to user.
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*/
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down_write(&EXT4_I(inode)->i_data_sem);
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down_read(&EXT4_I(inode)->i_data_sem);
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error = ext4_ext_walk_space(inode, start_blk, len_blks,
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ext4_ext_fiemap_cb, fieinfo);
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up_write(&EXT4_I(inode)->i_data_sem);
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up_read(&EXT4_I(inode)->i_data_sem);
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}
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return error;
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