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authorJaegeuk Kim <jaegeuk.kim@samsung.com>2013-10-24 13:31:34 +0900
committerJaegeuk Kim <jaegeuk.kim@samsung.com>2013-10-25 16:54:37 +0900
commit81eb8d6e2869b119d4a7b8c02091c3779733a3ac (patch)
treecdff776596fa79bfc9c2f2baf7aa59470dc29aec /fs/f2fs/node.c
parentaabe51364f44681cbd83fb1c27ef7d3dbe567c45 (diff)
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f2fs: reclaim prefree segments periodically
Previously, f2fs postpones reclaiming prefree segments into free segments as much as possible. However, if user writes and deletes a bunch of data without any sync or fsync calls, some flash storages can suffer from garbage collections. So, this patch adds the reclaiming codes to f2fs_write_node_pages and background GC thread. If there are a lot of prefree segments, let's do checkpoint so that f2fs submits discard commands for the prefree regions to the flash storage. Signed-off-by: Changman Lee <cm224.lee@samsung.com> Signed-off-by: Jaegeuk Kim <jaegeuk.kim@samsung.com>
Diffstat (limited to 'fs/f2fs/node.c')
-rw-r--r--fs/f2fs/node.c3
1 files changed, 2 insertions, 1 deletions
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c
index cc119b65a0d3..89dd8a5a3ca3 100644
--- a/fs/f2fs/node.c
+++ b/fs/f2fs/node.c
@@ -1206,7 +1206,8 @@ static int f2fs_write_node_pages(struct address_space *mapping,
long nr_to_write = wbc->nr_to_write;
/* First check balancing cached NAT entries */
- if (try_to_free_nats(sbi, NAT_ENTRY_PER_BLOCK)) {
+ if (try_to_free_nats(sbi, NAT_ENTRY_PER_BLOCK) ||
+ excess_prefree_segs(sbi)) {
f2fs_sync_fs(sbi->sb, true);
return 0;
}