diff options
| author | Daeho Jeong <daehojeong@google.com> | 2022-04-28 11:18:09 -0700 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2022-05-12 10:14:03 -0700 |
| commit | 3db1de0e582c358dd013f3703cd55b5fe4076436 (patch) | |
| tree | 230a5fdc8c4699d4b9a5bf7c252d8a2444e5706c /fs/f2fs/node.h | |
| parent | 6213f5d4d23c50d393a31dc8e351e63a1fd10dbe (diff) | |
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.h')
| -rw-r--r-- | fs/f2fs/node.h | 1 |
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/f2fs/node.h b/fs/f2fs/node.h index 4c1d34bfea78..3c09cae058b0 100644 --- a/fs/f2fs/node.h +++ b/fs/f2fs/node.h @@ -147,7 +147,6 @@ enum mem_type { DIRTY_DENTS, /* indicates dirty dentry pages */ INO_ENTRIES, /* indicates inode entries */ EXTENT_CACHE, /* indicates extent cache */ - INMEM_PAGES, /* indicates inmemory pages */ DISCARD_CACHE, /* indicates memory of cached discard cmds */ COMPRESS_PAGE, /* indicates memory of cached compressed pages */ BASE_CHECK, /* check kernel status */ |