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authorTheodore Ts'o <tytso@mit.edu>2009-05-17 23:31:23 -0400
committerTheodore Ts'o <tytso@mit.edu>2009-05-17 23:31:23 -0400
commit0568c518937ee3a9b6a94d18bae9c150fe5d6832 (patch)
treeb6392f24142e9199a7a0b34e29ac2f6c82a221d7 /fs/ext4/extents.c
parent6fd058f7791087648c683eb8572edf3be3c4c23c (diff)
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>
Diffstat (limited to 'fs/ext4/extents.c')
-rw-r--r--fs/ext4/extents.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c
index d04b779b780..d4e99e96fdd 100644
--- a/fs/ext4/extents.c
+++ b/fs/ext4/extents.c
@@ -3312,10 +3312,10 @@ int ext4_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
* Walk the extent tree gathering extent information.
* 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,
ext4_ext_fiemap_cb, fieinfo);
- up_write(&EXT4_I(inode)->i_data_sem);
+ up_read(&EXT4_I(inode)->i_data_sem);
}
return error;