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ceeb9c832e
When it's possible for reverse mappings to overlap (data fork extents of files on reflink filesystems), use the interval query function to find the left neighbor of an extent we're trying to add; and be careful to use the lookup functions to update the neighbors and/or add new extents. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
216 lines
6.3 KiB
C
216 lines
6.3 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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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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#endif /* __XFS_RMAP_H__ */
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