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| author | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2008-11-01 14:20:50 +0200 |
|---|---|---|
| committer | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2008-12-03 13:13:59 +0200 |
| commit | a1dc080c27ec8ea7ca1c8a9b499362a71ebff792 (patch) | |
| tree | a41c931fb6f7c8bdc0c3481545892216921074eb /fs/ubifs/super.c | |
| parent | 062e4fee4400f283307cf8ac1b7931c939010229 (diff) | |
| download | lwn-a1dc080c27ec8ea7ca1c8a9b499362a71ebff792.tar.gz lwn-a1dc080c27ec8ea7ca1c8a9b499362a71ebff792.zip | |
UBIFS: use bit-fields to store compression type
Save a 4 bytes of RAM per 'struct inode' by stroring inode
compression type in bit-filed, instead of using 'int'.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Diffstat (limited to 'fs/ubifs/super.c')
| -rw-r--r-- | fs/ubifs/super.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/ubifs/super.c b/fs/ubifs/super.c index d80b2aef42b6..21b4103271ec 100644 --- a/fs/ubifs/super.c +++ b/fs/ubifs/super.c @@ -2021,6 +2021,14 @@ static int __init ubifs_init(void) BUILD_BUG_ON(UBIFS_REF_NODE_SZ != 64); /* + * We use 2 bit wide bit-fields to store compression type, which should + * be amended if more compressors are added. The bit-fields are: + * @compr_type in 'struct ubifs_inode' and @default_compr in + * 'struct ubifs_info'. + */ + BUILD_BUG_ON(UBIFS_COMPR_TYPES_CNT > 4); + + /* * We require that PAGE_CACHE_SIZE is greater-than-or-equal-to * UBIFS_BLOCK_SIZE. It is assumed that both are powers of 2. */ |