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| author | Chao Yu <yuchao0@huawei.com> | 2018-02-26 22:04:13 +0800 |
|---|---|---|
| committer | Jaegeuk Kim <jaegeuk@kernel.org> | 2018-03-13 08:05:48 +0900 |
| commit | 846ae671ad368e344a2b141c0f19e1014b27a0dd (patch) | |
| tree | b220f05ab079e37343b841d368a58916388149ab /include/linux/f2fs_fs.h | |
| parent | 17cd07ae95073c298af92c1ba14ac58ce84de33b (diff) | |
f2fs: expose extension_list sysfs entry
This patch adds a sysfs entry 'extension_list' to support
query/add/del item in extension list.
Query:
cat /sys/fs/f2fs/<device>/extension_list
Add:
echo 'extension' > /sys/fs/f2fs/<device>/extension_list
Del:
echo '!extension' > /sys/fs/f2fs/<device>/extension_list
Signed-off-by: Chao Yu <yuchao0@huawei.com>
Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
Diffstat (limited to 'include/linux/f2fs_fs.h')
| -rw-r--r-- | include/linux/f2fs_fs.h | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/include/linux/f2fs_fs.h b/include/linux/f2fs_fs.h index 96c9bdbace50..d8c241451712 100644 --- a/include/linux/f2fs_fs.h +++ b/include/linux/f2fs_fs.h @@ -21,6 +21,7 @@ #define F2FS_BLKSIZE 4096 /* support only 4KB block */ #define F2FS_BLKSIZE_BITS 12 /* bits for F2FS_BLKSIZE */ #define F2FS_MAX_EXTENSION 64 /* # of extension entries */ +#define F2FS_EXTENSION_LEN 8 /* max size of extension */ #define F2FS_BLK_ALIGN(x) (((x) + F2FS_BLKSIZE - 1) >> F2FS_BLKSIZE_BITS) #define NULL_ADDR ((block_t)0) /* used as block_t addresses */ @@ -101,7 +102,7 @@ struct f2fs_super_block { __u8 uuid[16]; /* 128-bit uuid for volume */ __le16 volume_name[MAX_VOLUME_NAME]; /* volume name */ __le32 extension_count; /* # of extensions below */ - __u8 extension_list[F2FS_MAX_EXTENSION][8]; /* extension array */ + __u8 extension_list[F2FS_MAX_EXTENSION][F2FS_EXTENSION_LEN];/* extension array */ __le32 cp_payload; __u8 version[VERSION_LEN]; /* the kernel version */ __u8 init_version[VERSION_LEN]; /* the initial kernel version */ |