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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>
This commit is contained in:
Theodore Ts'o 2009-05-17 23:31:23 -04:00
parent 6fd058f779
commit 0568c51893
1 changed files with 2 additions and 2 deletions
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4
fs/ext4/extents.c
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@ -3312,10 +3312,10 @@ int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
* Walk the extent tree gathering extent information. * Walk the extent tree gathering extent information.
* ext4_ext_fiemap_cb will push extents back to user. * ext4_ext_fiemap_cb will push extents back to user.
*/ */
down_write(&EXT4_I(inode)->i_data_sem); down_read(&EXT4_I(inode)->i_data_sem);
error = ext4_ext_walk_space(inode, start_blk, len_blks, error = ext4_ext_walk_space(inode, start_blk, len_blks,
ext4_ext_fiemap_cb, fieinfo); ext4_ext_fiemap_cb, fieinfo);
up_write(&EXT4_I(inode)->i_data_sem); up_read(&EXT4_I(inode)->i_data_sem);
} }
return error; return error;