From 1a89734d4057066344356e9c7e13b6379497aebe Mon Sep 17 00:00:00 2001 From: "Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com> Date: Tue, 29 Apr 2008 08:11:12 -0400 Subject: [PATCH] ext4: Return unwritten buffer head when trying to read from prealloc space. ext4_ext_get_blocks() returns the number of blocks allocated with buffer head unmapped for a read from prealloc space. This is needed so that delayed allocation doesn't do block reservation for prealloc space since the blocks are already reserved on disk. Mark the buffer head unwritten. Some code paths try to read the block if the buffer_head is not new and no uptodate. Marking the buffer head unwritten avoids this reading. Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com> Signed-off-by: "Theodore Ts'o" <tytso@mit.edu> --- fs/ext4/extents.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/fs/ext4/extents.c b/fs/ext4/extents.c index f4ef0b745a53..7733e2943367 100644 --- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -2580,6 +2580,8 @@ int ext4_ext_get_blocks(handle_t *handle, struct inode *inode, */ if (allocated > max_blocks) allocated = max_blocks; + /* mark the buffer unwritten */ + __set_bit(BH_Unwritten, &bh_result->b_state); goto out2; } -- GitLab