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Commit 91246c00 authored by Aneesh Kumar K.V's avatar Aneesh Kumar K.V Committed by Theodore Ts'o
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ext4: Initialize writeback_index to 0 when allocating a new inode 



The write_cache_pages() function uses the mapping->writeback_index as
the starting index to write out when range_cyclic is set.  Properly
initialize writeback_index so that we start the writeout at index 0.

This was found when debugging the small file fragmentation on ext4.

Signed-off-by: default avatarAneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: default avatar"Theodore Ts'o" <tytso@mit.edu>
parent 16eb7295

fs/ext4/super.c

+1 −0
Original line number Diff line number Diff line
@@ -568,6 +568,7 @@ static struct inode *ext4_alloc_inode(struct super_block *sb) 
#endif

	ei->i_block_alloc_info = NULL;

	ei->vfs_inode.i_version = 1;

	ei->vfs_inode.i_data.writeback_index = 0;

	memset(&ei->i_cached_extent, 0, sizeof(struct ext4_ext_cache));

	INIT_LIST_HEAD(&ei->i_prealloc_list);

	spin_lock_init(&ei->i_prealloc_lock);