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f2fs: support multiple devices

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This patch implements multiple devices support for f2fs.
Given multiple devices by mkfs.f2fs, f2fs shows them entirely as one big
volume under one f2fs instance.

Internal block management is very simple, but we will modify block allocation
and background GC policy to boost IO speed by exploiting them accoording to
each device speed.

Signed-off-by: Jaegeuk Kim <jaegeuk@kernel.org>
This commit is contained in:
Jaegeuk Kim 2016-10-06 19:02:05 -07:00
parent e57e9ae5b1
commit 3c62be17d4
5 changed files with 277 additions and 74 deletions
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10
include/linux/f2fs_fs.h
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@ -52,10 +52,17 @@
#define VERSION_LEN 256
#define MAX_VOLUME_NAME 512
#define MAX_PATH_LEN 64
#define MAX_DEVICES 8
/*
* For superblock
*/
struct f2fs_device {
__u8 path[MAX_PATH_LEN];
__le32 total_segments;
} __packed;
struct f2fs_super_block {
__le32 magic; /* Magic Number */
__le16 major_ver; /* Major Version */
@ -94,7 +101,8 @@ struct f2fs_super_block {
__le32 feature; /* defined features */
__u8 encryption_level; /* versioning level for encryption */
__u8 encrypt_pw_salt[16]; /* Salt used for string2key algorithm */
__u8 reserved[871]; /* valid reserved region */
struct f2fs_device devs[MAX_DEVICES]; /* device list */
__u8 reserved[327]; /* valid reserved region */
} __packed;
/*