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ext4: Fix small file fragmentation

Bladeren bron 
For small file block allocations, mballoc uses per cpu prealloc
space.  Use goal block when searching for the right prealloc
space.  Also make sure ext4_da_writepages tries to write
all the pages for small files in single attempt

Signed-off-by: Aneesh Kumar K.V <aneesh.kumar@linux.vnet.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Aneesh Kumar K.V
2008-08-18 18:00:57 -04:00
gecommit door Theodore Ts'o
bovenliggende 91246c0090
commit 5e745b041f
2 gewijzigde bestanden met toevoegingen van 61 en 13 verwijderingen
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21
fs/ext4/inode.c
Bestand weergeven

@@ -2282,13 +2282,12 @@ static int ext4_da_writepages_trans_blocks(struct inode *inode)
static int ext4_da_writepages(struct address_space *mapping,
struct writeback_control *wbc)
{
struct inode *inode = mapping->host;
handle_t *handle = NULL;
int needed_blocks;
int ret = 0;
long to_write;
loff_t range_start = 0;
long pages_skipped = 0;
struct inode *inode = mapping->host;
int needed_blocks, ret = 0, nr_to_writebump = 0;
long to_write, pages_skipped = 0;
struct ext4_sb_info *sbi = EXT4_SB(mapping->host->i_sb);
/*
* No pages to write? This is mainly a kludge to avoid starting
@@ -2297,6 +2296,16 @@ static int ext4_da_writepages(struct address_space *mapping,
*/
if (!mapping->nrpages || !mapping_tagged(mapping, PAGECACHE_TAG_DIRTY))
return 0;
/*
* Make sure nr_to_write is >= sbi->s_mb_stream_request
* This make sure small files blocks are allocated in
* single attempt. This ensure that small files
* get less fragmented.
*/
if (wbc->nr_to_write < sbi->s_mb_stream_request) {
nr_to_writebump = sbi->s_mb_stream_request - wbc->nr_to_write;
wbc->nr_to_write = sbi->s_mb_stream_request;
}
if (!wbc->range_cyclic)
/*
@@ -2377,7 +2386,7 @@ restart_loop:
}
out_writepages:
wbc->nr_to_write = to_write;
wbc->nr_to_write = to_write - nr_to_writebump;
wbc->range_start = range_start;
return ret;
}