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xfs: explicitly define inode timestamp range 

Formally define the inode timestamp ranges that existing filesystems
support, and switch the vfs timetamp ranges to use it.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Allison Collins <allison.henderson@oracle.com>
Reviewed-by: Gao Xiang <hsiangkao@redhat.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2020-08-17 09:58:02 -07:00
parent b896a39faa
commit 876fdc7c4f
2 changed files with 24 additions and 2 deletions
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22
fs/xfs/libxfs/xfs_format.h
View File

@ -848,11 +848,33 @@ struct xfs_agfl {
ASSERT(xfs_daddr_to_agno(mp, d) == \
xfs_daddr_to_agno(mp, (d) + (len) - 1)))
/*
* XFS Timestamps
* ==============
*
* Traditional ondisk inode timestamps consist of signed 32-bit counters for
* seconds and nanoseconds; time zero is the Unix epoch, Jan 1 00:00:00 UTC
* 1970, which means that the timestamp epoch is the same as the Unix epoch.
* Therefore, the ondisk min and max defined here can be used directly to
* constrain the incore timestamps on a Unix system.
*/
typedef struct xfs_timestamp {
__be32 t_sec; /* timestamp seconds */
__be32 t_nsec; /* timestamp nanoseconds */
} xfs_timestamp_t;
/*
* Smallest possible ondisk seconds value with traditional timestamps. This
* corresponds exactly with the incore timestamp Dec 13 20:45:52 UTC 1901.
*/
#define XFS_LEGACY_TIME_MIN ((int64_t)S32_MIN)
/*
* Largest possible ondisk seconds value with traditional timestamps. This
* corresponds exactly with the incore timestamp Jan 19 03:14:07 UTC 2038.
*/
#define XFS_LEGACY_TIME_MAX ((int64_t)S32_MAX)
/*
* On-disk inode structure.
*

4
fs/xfs/xfs_super.c
View File

@ -1484,8 +1484,8 @@ xfs_fc_fill_super(
sb->s_maxbytes = MAX_LFS_FILESIZE;
sb->s_max_links = XFS_MAXLINK;
sb->s_time_gran = 1;
sb->s_time_min = S32_MIN;
sb->s_time_max = S32_MAX;
sb->s_time_min = XFS_LEGACY_TIME_MIN;
sb->s_time_max = XFS_LEGACY_TIME_MAX;
sb->s_iflags |= SB_I_CGROUPWB;
set_posix_acl_flag(sb);