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xfs: add a define for statfs magic to uapi 

Needed by userspace programs that call fstatfs().

It'd be natural to publish XFS_SB_MAGIC in uapi, but while these two
have identical values, they have different semantic meaning: one is
an enum cookie meant for statfs, the other a signature of the
on-disk format.

Signed-off-by: Adam Borowski <kilobyte@angband.pl>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Adam Borowski 2018-10-18 17:20:19 +11:00 committed by Dave Chinner
parent 4831822ff1
commit dddde68b8f
2 changed files with 4 additions and 2 deletions
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5
fs/xfs/xfs_super.c
View File

@ -43,6 +43,7 @@
#include <linux/dax.h>
#include <linux/init.h>
#include <linux/slab.h>
#include <linux/magic.h>
#include <linux/mount.h>
#include <linux/mempool.h>
#include <linux/writeback.h>
@ -1128,7 +1129,7 @@ xfs_fs_statfs(
xfs_extlen_t lsize;
int64_t ffree;
statp->f_type = XFS_SB_MAGIC;
statp->f_type = XFS_SUPER_MAGIC;
statp->f_namelen = MAXNAMELEN - 1;
id = huge_encode_dev(mp->m_ddev_targp->bt_dev);
@ -1681,7 +1682,7 @@ xfs_fs_fill_super(
* we must configure the block size in the superblock before we run the
* full mount process as the mount process can lookup and cache inodes.
*/
sb->s_magic = XFS_SB_MAGIC;
sb->s_magic = XFS_SUPER_MAGIC;
sb->s_blocksize = mp->m_sb.sb_blocksize;
sb->s_blocksize_bits = ffs(sb->s_blocksize) - 1;
sb->s_maxbytes = xfs_max_file_offset(sb->s_blocksize_bits);

1
include/uapi/linux/magic.h
View File

@ -29,6 +29,7 @@
#define HPFS_SUPER_MAGIC 0xf995e849
#define ISOFS_SUPER_MAGIC 0x9660
#define JFFS2_SUPER_MAGIC 0x72b6
#define XFS_SUPER_MAGIC 0x58465342 /* "XFSB" */
#define PSTOREFS_MAGIC 0x6165676C
#define EFIVARFS_MAGIC 0xde5e81e4
#define HOSTFS_SUPER_MAGIC 0x00c0ffee