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Date: Mon, 8 Jun 2009 15:22:55 -0400 From: Theodore Ts'o <tytso@....edu> To: Linux Kernel Developers List <linux-kernel@...r.kernel.org> Cc: Theodore Ts'o <tytso@....edu>, Eric Sandeen <sandeen@...hat.com> Subject: [PATCH 37/49] 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@...hat.com> Signed-off-by: "Theodore Ts'o" <tytso@....edu> --- fs/ext4/extents.c | 4 ++-- 1 files changed, 2 insertions(+), 2 deletions(-) diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index d04b779..d4e99e9 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; -- 1.6.3.2.1.gb9f7d.dirty -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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