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xfs: implement online get/set fs label

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The GET ioctl is trivial, just return the current label.

The SET ioctl is more involved:
It transactionally modifies the superblock to write a new filesystem
label to the primary super.

A new variant of xfs_sync_sb then writes the superblock buffer
immediately to disk so that the change is visible from userspace.

It then invalidates any page cache that userspace might have previously
read on the block device so that i.e. blkid can see the change
immediately, and updates all secondary superblocks as userspace relable
does.

Signed-off-by: Eric Sandeen <sandeen@redhat.com>
[darrick: use dchinner's new xfs_update_secondary_sbs function]
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
This commit is contained in:
Eric Sandeen
2018-05-15 13:21:48 -07:00
committed by Darrick J. Wong
parent 62750d040b
commit f7664b3197
4 changed files with 122 additions and 2 deletions
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30
fs/xfs/libxfs/xfs_sb.c
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@@ -961,6 +961,36 @@ xfs_update_secondary_sbs(
return saved_error ? saved_error : error;
}
/*
* Same behavior as xfs_sync_sb, except that it is always synchronous and it
* also writes the superblock buffer to disk sector 0 immediately.
*/
int
xfs_sync_sb_buf(
struct xfs_mount *mp)
{
struct xfs_trans *tp;
int error;
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_sb, 0, 0, 0, &tp);
if (error)
return error;
xfs_log_sb(tp);
xfs_trans_bhold(tp, mp->m_sb_bp);
xfs_trans_set_sync(tp);
error = xfs_trans_commit(tp);
if (error)
goto out;
/*
* write out the sb buffer to get the changes to disk
*/
error = xfs_bwrite(mp->m_sb_bp);
out:
xfs_buf_relse(mp->m_sb_bp);
return error;
}
int
xfs_fs_geometry(
struct xfs_sb *sbp,