f7664b3197
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>
54 lines
2 KiB
C
54 lines
2 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* All Rights Reserved.
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it would be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef __XFS_SB_H__
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#define __XFS_SB_H__
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struct xfs_mount;
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struct xfs_sb;
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struct xfs_dsb;
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struct xfs_trans;
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struct xfs_fsop_geom;
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struct xfs_perag;
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/*
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* perag get/put wrappers for ref counting
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*/
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extern struct xfs_perag *xfs_perag_get(struct xfs_mount *, xfs_agnumber_t);
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extern struct xfs_perag *xfs_perag_get_tag(struct xfs_mount *, xfs_agnumber_t,
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int tag);
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extern void xfs_perag_put(struct xfs_perag *pag);
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extern int xfs_initialize_perag_data(struct xfs_mount *, xfs_agnumber_t);
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extern void xfs_log_sb(struct xfs_trans *tp);
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extern int xfs_sync_sb(struct xfs_mount *mp, bool wait);
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extern int xfs_sync_sb_buf(struct xfs_mount *mp);
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extern void xfs_sb_mount_common(struct xfs_mount *mp, struct xfs_sb *sbp);
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extern void xfs_sb_from_disk(struct xfs_sb *to, struct xfs_dsb *from);
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extern void xfs_sb_to_disk(struct xfs_dsb *to, struct xfs_sb *from);
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extern void xfs_sb_quota_from_disk(struct xfs_sb *sbp);
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extern int xfs_update_secondary_sbs(struct xfs_mount *mp);
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#define XFS_FS_GEOM_MAX_STRUCT_VER (4)
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extern int xfs_fs_geometry(struct xfs_sb *sbp, struct xfs_fsop_geom *geo,
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int struct_version);
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extern int xfs_sb_read_secondary(struct xfs_mount *mp,
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struct xfs_trans *tp, xfs_agnumber_t agno,
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struct xfs_buf **bpp);
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#endif /* __XFS_SB_H__ */
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