diff options
| author | Daeho Jeong <daehojeong@google.com> | 2022-04-28 21:18:09 +0300 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2022-05-12 20:14:03 +0300 |
| commit | 3db1de0e582c358dd013f3703cd55b5fe4076436 (patch) | |
| tree | 230a5fdc8c4699d4b9a5bf7c252d8a2444e5706c /fs/f2fs/node.c | |
| parent | 6213f5d4d23c50d393a31dc8e351e63a1fd10dbe (diff) | |
| download | linux-3db1de0e582c358dd013f3703cd55b5fe4076436.tar.xz | |
f2fs: change the current atomic write way
Current atomic write has three major issues like below.
- keeps the updates in non-reclaimable memory space and they are even
hard to be migrated, which is not good for contiguous memory
allocation.
- disk spaces used for atomic files cannot be garbage collected, so
this makes it difficult for the filesystem to be defragmented.
- If atomic write operations hit the threshold of either memory usage
or garbage collection failure count, All the atomic write operations
will fail immediately.
To resolve the issues, I will keep a COW inode internally for all the
updates to be flushed from memory, when we need to flush them out in a
situation like high memory pressure. These COW inodes will be tagged
as orphan inodes to be reclaimed in case of sudden power-cut or system
failure during atomic writes.
Signed-off-by: Daeho Jeong <daehojeong@google.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'fs/f2fs/node.c')
| -rw-r--r-- | fs/f2fs/node.c | 4 |
1 files changed, 0 insertions, 4 deletions
diff --git a/fs/f2fs/node.c b/fs/f2fs/node.c index 51230cba841b..beda8cbb791d 100644 --- a/fs/f2fs/node.c +++ b/fs/f2fs/node.c @@ -90,10 +90,6 @@ bool f2fs_available_free_memory(struct f2fs_sb_info *sbi, int type) atomic_read(&sbi->total_ext_node) * sizeof(struct extent_node)) >> PAGE_SHIFT; res = mem_size < ((avail_ram * nm_i->ram_thresh / 100) >> 1); - } else if (type == INMEM_PAGES) { - /* it allows 20% / total_ram for inmemory pages */ - mem_size = get_pages(sbi, F2FS_INMEM_PAGES); - res = mem_size < (val.totalram / 5); } else if (type == DISCARD_CACHE) { mem_size = (atomic_read(&dcc->discard_cmd_cnt) * sizeof(struct discard_cmd)) >> PAGE_SHIFT; |