forked from mirrors/linux
e89c041338
Introduce a new ioctl that uses the reverse mapping btree to return information about the physical layout of the filesystem. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Brian Foster <bfoster@redhat.com>
220 lines
6.4 KiB
C
220 lines
6.4 KiB
C
/*
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* Copyright (C) 2016 Oracle. All Rights Reserved.
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*
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* Author: Darrick J. Wong <darrick.wong@oracle.com>
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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
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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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_RMAP_H__
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#define __XFS_RMAP_H__
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static inline void
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xfs_rmap_ag_owner(
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struct xfs_owner_info *oi,
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uint64_t owner)
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{
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oi->oi_owner = owner;
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oi->oi_offset = 0;
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oi->oi_flags = 0;
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}
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static inline void
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xfs_rmap_ino_bmbt_owner(
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struct xfs_owner_info *oi,
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xfs_ino_t ino,
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int whichfork)
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{
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oi->oi_owner = ino;
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oi->oi_offset = 0;
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oi->oi_flags = XFS_OWNER_INFO_BMBT_BLOCK;
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if (whichfork == XFS_ATTR_FORK)
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oi->oi_flags |= XFS_OWNER_INFO_ATTR_FORK;
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}
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static inline void
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xfs_rmap_ino_owner(
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struct xfs_owner_info *oi,
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xfs_ino_t ino,
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int whichfork,
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xfs_fileoff_t offset)
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{
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oi->oi_owner = ino;
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oi->oi_offset = offset;
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oi->oi_flags = 0;
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if (whichfork == XFS_ATTR_FORK)
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oi->oi_flags |= XFS_OWNER_INFO_ATTR_FORK;
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}
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static inline void
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xfs_rmap_skip_owner_update(
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struct xfs_owner_info *oi)
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{
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oi->oi_owner = XFS_RMAP_OWN_UNKNOWN;
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}
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/* Reverse mapping functions. */
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struct xfs_buf;
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static inline __u64
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xfs_rmap_irec_offset_pack(
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const struct xfs_rmap_irec *irec)
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{
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__u64 x;
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x = XFS_RMAP_OFF(irec->rm_offset);
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if (irec->rm_flags & XFS_RMAP_ATTR_FORK)
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x |= XFS_RMAP_OFF_ATTR_FORK;
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if (irec->rm_flags & XFS_RMAP_BMBT_BLOCK)
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x |= XFS_RMAP_OFF_BMBT_BLOCK;
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if (irec->rm_flags & XFS_RMAP_UNWRITTEN)
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x |= XFS_RMAP_OFF_UNWRITTEN;
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return x;
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}
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static inline int
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xfs_rmap_irec_offset_unpack(
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__u64 offset,
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struct xfs_rmap_irec *irec)
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{
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if (offset & ~(XFS_RMAP_OFF_MASK | XFS_RMAP_OFF_FLAGS))
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return -EFSCORRUPTED;
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irec->rm_offset = XFS_RMAP_OFF(offset);
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if (offset & XFS_RMAP_OFF_ATTR_FORK)
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irec->rm_flags |= XFS_RMAP_ATTR_FORK;
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if (offset & XFS_RMAP_OFF_BMBT_BLOCK)
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irec->rm_flags |= XFS_RMAP_BMBT_BLOCK;
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if (offset & XFS_RMAP_OFF_UNWRITTEN)
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irec->rm_flags |= XFS_RMAP_UNWRITTEN;
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return 0;
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}
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static inline void
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xfs_owner_info_unpack(
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struct xfs_owner_info *oinfo,
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uint64_t *owner,
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uint64_t *offset,
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unsigned int *flags)
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{
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unsigned int r = 0;
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*owner = oinfo->oi_owner;
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*offset = oinfo->oi_offset;
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if (oinfo->oi_flags & XFS_OWNER_INFO_ATTR_FORK)
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r |= XFS_RMAP_ATTR_FORK;
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if (oinfo->oi_flags & XFS_OWNER_INFO_BMBT_BLOCK)
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r |= XFS_RMAP_BMBT_BLOCK;
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*flags = r;
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}
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static inline void
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xfs_owner_info_pack(
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struct xfs_owner_info *oinfo,
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uint64_t owner,
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uint64_t offset,
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unsigned int flags)
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{
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oinfo->oi_owner = owner;
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oinfo->oi_offset = XFS_RMAP_OFF(offset);
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oinfo->oi_flags = 0;
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if (flags & XFS_RMAP_ATTR_FORK)
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oinfo->oi_flags |= XFS_OWNER_INFO_ATTR_FORK;
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if (flags & XFS_RMAP_BMBT_BLOCK)
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oinfo->oi_flags |= XFS_OWNER_INFO_BMBT_BLOCK;
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}
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int xfs_rmap_alloc(struct xfs_trans *tp, struct xfs_buf *agbp,
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xfs_agnumber_t agno, xfs_agblock_t bno, xfs_extlen_t len,
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struct xfs_owner_info *oinfo);
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int xfs_rmap_free(struct xfs_trans *tp, struct xfs_buf *agbp,
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xfs_agnumber_t agno, xfs_agblock_t bno, xfs_extlen_t len,
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struct xfs_owner_info *oinfo);
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int xfs_rmap_lookup_le(struct xfs_btree_cur *cur, xfs_agblock_t bno,
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xfs_extlen_t len, uint64_t owner, uint64_t offset,
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unsigned int flags, int *stat);
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int xfs_rmap_lookup_eq(struct xfs_btree_cur *cur, xfs_agblock_t bno,
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xfs_extlen_t len, uint64_t owner, uint64_t offset,
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unsigned int flags, int *stat);
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int xfs_rmap_insert(struct xfs_btree_cur *rcur, xfs_agblock_t agbno,
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xfs_extlen_t len, uint64_t owner, uint64_t offset,
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unsigned int flags);
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int xfs_rmap_get_rec(struct xfs_btree_cur *cur, struct xfs_rmap_irec *irec,
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int *stat);
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typedef int (*xfs_rmap_query_range_fn)(
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struct xfs_btree_cur *cur,
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struct xfs_rmap_irec *rec,
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void *priv);
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int xfs_rmap_query_range(struct xfs_btree_cur *cur,
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struct xfs_rmap_irec *low_rec, struct xfs_rmap_irec *high_rec,
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xfs_rmap_query_range_fn fn, void *priv);
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int xfs_rmap_query_all(struct xfs_btree_cur *cur, xfs_rmap_query_range_fn fn,
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void *priv);
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enum xfs_rmap_intent_type {
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XFS_RMAP_MAP,
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XFS_RMAP_MAP_SHARED,
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XFS_RMAP_UNMAP,
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XFS_RMAP_UNMAP_SHARED,
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XFS_RMAP_CONVERT,
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XFS_RMAP_CONVERT_SHARED,
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XFS_RMAP_ALLOC,
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XFS_RMAP_FREE,
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};
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struct xfs_rmap_intent {
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struct list_head ri_list;
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enum xfs_rmap_intent_type ri_type;
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__uint64_t ri_owner;
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int ri_whichfork;
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struct xfs_bmbt_irec ri_bmap;
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};
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/* functions for updating the rmapbt based on bmbt map/unmap operations */
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int xfs_rmap_map_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
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struct xfs_inode *ip, int whichfork,
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struct xfs_bmbt_irec *imap);
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int xfs_rmap_unmap_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
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struct xfs_inode *ip, int whichfork,
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struct xfs_bmbt_irec *imap);
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int xfs_rmap_convert_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
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struct xfs_inode *ip, int whichfork,
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struct xfs_bmbt_irec *imap);
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int xfs_rmap_alloc_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
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xfs_agnumber_t agno, xfs_agblock_t bno, xfs_extlen_t len,
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__uint64_t owner);
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int xfs_rmap_free_extent(struct xfs_mount *mp, struct xfs_defer_ops *dfops,
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xfs_agnumber_t agno, xfs_agblock_t bno, xfs_extlen_t len,
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__uint64_t owner);
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void xfs_rmap_finish_one_cleanup(struct xfs_trans *tp,
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struct xfs_btree_cur *rcur, int error);
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int xfs_rmap_finish_one(struct xfs_trans *tp, enum xfs_rmap_intent_type type,
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__uint64_t owner, int whichfork, xfs_fileoff_t startoff,
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xfs_fsblock_t startblock, xfs_filblks_t blockcount,
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xfs_exntst_t state, struct xfs_btree_cur **pcur);
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int xfs_rmap_find_left_neighbor(struct xfs_btree_cur *cur, xfs_agblock_t bno,
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uint64_t owner, uint64_t offset, unsigned int flags,
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struct xfs_rmap_irec *irec, int *stat);
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int xfs_rmap_lookup_le_range(struct xfs_btree_cur *cur, xfs_agblock_t bno,
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uint64_t owner, uint64_t offset, unsigned int flags,
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struct xfs_rmap_irec *irec, int *stat);
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int xfs_rmap_compare(const struct xfs_rmap_irec *a,
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const struct xfs_rmap_irec *b);
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#endif /* __XFS_RMAP_H__ */
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