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btrfs: consolidate auto defrag kick off policies

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As of now writes smaller than 64k for non compressed extents and 16k
for compressed extents inside eof are considered as candidate
for auto defrag, put them together at a place.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2016-12-19 19:09:06 +08:00 committed by David Sterba
parent 8c3e6b1f0c
commit 26d30f8529
1 changed files with 11 additions and 8 deletions
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19
fs/btrfs/inode.c
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@ -388,6 +388,15 @@ static inline int inode_need_compress(struct inode *inode)
return 0;
}
static inline void inode_should_defrag(struct inode *inode,
u64 start, u64 end, u64 num_bytes, u64 small_write)
{
/* If this is a small write inside eof, kick off a defrag */
if (num_bytes < small_write &&
(start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size))
btrfs_add_inode_defrag(NULL, inode);
}
/*
* we create compressed extents in two phases. The first
* phase compresses a range of pages that have already been
@ -430,10 +439,7 @@ static noinline void compress_file_range(struct inode *inode,
int compress_type = fs_info->compress_type;
int redirty = 0;
/* if this is a small write inside eof, kick off a defrag */
if ((end - start + 1) < SZ_16K &&
(start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size))
btrfs_add_inode_defrag(NULL, inode);
inode_should_defrag(inode, start, end, end - start + 1, SZ_16K);
actual_end = min_t(u64, isize, end + 1);
again:
@ -965,10 +971,7 @@ static noinline int cow_file_range(struct inode *inode,
num_bytes = max(blocksize, num_bytes);
disk_num_bytes = num_bytes;
/* if this is a small write inside eof, kick off defrag */
if (num_bytes < SZ_64K &&
(start > 0 || end + 1 < BTRFS_I(inode)->disk_i_size))
btrfs_add_inode_defrag(NULL, inode);
inode_should_defrag(inode, start, end, num_bytes, SZ_64K);
if (start == 0) {
/* lets try to make an inline extent */