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Btrfs: add mount -o auto_defrag

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This will detect small random writes into files and
queue the up for an auto defrag process.  It isn't well suited to
database workloads yet, but works for smaller files such as rpm, sqlite
or bdb databases.

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2011-05-24 15:35:30 -04:00
parent d6c0cb379c
commit 4cb5300bc8
8 changed files with 681 additions and 138 deletions
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12
fs/btrfs/inode.c
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@ -342,6 +342,10 @@ static noinline int compress_file_range(struct inode *inode,
int will_compress;
int compress_type = root->fs_info->compress_type;
/* if this is a small write inside eof, kick off a defragbot */
if (end <= BTRFS_I(inode)->disk_i_size && (end - start + 1) < 16 * 1024)
btrfs_add_inode_defrag(NULL, inode);
actual_end = min_t(u64, isize, end + 1);
again:
will_compress = 0;
@ -799,6 +803,10 @@ static noinline int cow_file_range(struct inode *inode,
disk_num_bytes = num_bytes;
ret = 0;
/* if this is a small write inside eof, kick off defrag */
if (end <= BTRFS_I(inode)->disk_i_size && num_bytes < 64 * 1024)
btrfs_add_inode_defrag(trans, inode);
if (start == 0) {
/* lets try to make an inline extent */
ret = cow_file_range_inline(trans, root, inode,
@ -5371,6 +5379,9 @@ static struct extent_map *btrfs_new_extent_direct(struct inode *inode,
if (IS_ERR(trans))
return ERR_CAST(trans);
if (start <= BTRFS_I(inode)->disk_i_size && len < 64 * 1024)
btrfs_add_inode_defrag(trans, inode);
trans->block_rsv = &root->fs_info->delalloc_block_rsv;
alloc_hint = get_extent_allocation_hint(inode, start, len);
@ -6682,6 +6693,7 @@ struct inode *btrfs_alloc_inode(struct super_block *sb)
ei->ordered_data_close = 0;
ei->orphan_meta_reserved = 0;
ei->dummy_inode = 0;
ei->in_defrag = 0;
ei->force_compress = BTRFS_COMPRESS_NONE;
ei->delayed_node = NULL;