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erofs: rename ctime to mtime 

EROFS images should inherit modification time rather than change time,
since users and host tooling have no easy way to control change time.

To reflect the new timestamp meaning, i_ctime and i_ctime_nsec are
renamed to i_mtime and i_mtime_nsec.

Link: https://lore.kernel.org/r/20220311041829.3109511-1-dvander@google.com # v1
Signed-off-by: David Anderson <dvander@google.com>
[ Gao Xiang: update document as well. ]
Reviewed-by: Chao Yu <chao@kernel.org>
Link: https://lore.kernel.org/r/20220317114959.106787-1-hsiangkao@linux.alibaba.com # v2
Signed-off-by: Gao Xiang <hsiangkao@linux.alibaba.com>
This commit is contained in:
David Anderson 2022-03-17 19:49:59 +08:00 committed by Gao Xiang
parent 500edd0956
commit a1108dcd93
3 changed files with 6 additions and 5 deletions
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2
Documentation/filesystems/erofs.rst
View File

@ -40,7 +40,7 @@ Here is the main features of EROFS:
Inode metadata size 32 bytes 64 bytes
Max file size 4 GB 16 EB (also limited by max. vol size)
Max uids/gids 65536 4294967296
File change time no yes (64 + 32-bit timestamp)
Per-inode timestamp no yes (64 + 32-bit timestamp)
Max hardlinks 65536 4294967296
Metadata reserved 4 bytes 14 bytes
===================== ============ =====================================

5
fs/erofs/erofs_fs.h
View File

@ -12,6 +12,7 @@
#define EROFS_SUPER_OFFSET 1024
#define EROFS_FEATURE_COMPAT_SB_CHKSUM 0x00000001
#define EROFS_FEATURE_COMPAT_MTIME 0x00000002
/*
* Any bits that aren't in EROFS_ALL_FEATURE_INCOMPAT should
@ -186,8 +187,8 @@ struct erofs_inode_extended {
__le32 i_uid;
__le32 i_gid;
__le64 i_ctime;
__le32 i_ctime_nsec;
__le64 i_mtime;
__le32 i_mtime_nsec;
__le32 i_nlink;
__u8 i_reserved2[16];
};

4
fs/erofs/inode.c
View File

@ -113,8 +113,8 @@ static void *erofs_read_inode(struct erofs_buf *buf,
set_nlink(inode, le32_to_cpu(die->i_nlink));
/* extended inode has its own timestamp */
inode->i_ctime.tv_sec = le64_to_cpu(die->i_ctime);
inode->i_ctime.tv_nsec = le32_to_cpu(die->i_ctime_nsec);
inode->i_ctime.tv_sec = le64_to_cpu(die->i_mtime);
inode->i_ctime.tv_nsec = le32_to_cpu(die->i_mtime_nsec);
inode->i_size = le64_to_cpu(die->i_size);