forked from mirrors/linux
1946b91cee
Start constructing the refcount btree implementation by establishing the on-disk format and everything needed to read, write, and manipulate the refcount btree blocks. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Christoph Hellwig <hch@lst.de>
147 lines
5.2 KiB
C
147 lines
5.2 KiB
C
/*
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* Copyright (c) 2000-2005 Silicon Graphics, Inc.
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* Copyright (c) 2013 Red Hat, 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_SHARED_H__
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#define __XFS_SHARED_H__
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/*
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* Definitions shared between kernel and userspace that don't fit into any other
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* header file that is shared with userspace.
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*/
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struct xfs_ifork;
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struct xfs_buf;
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struct xfs_buf_ops;
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struct xfs_mount;
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struct xfs_trans;
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struct xfs_inode;
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/*
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* Buffer verifier operations are widely used, including userspace tools
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*/
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extern const struct xfs_buf_ops xfs_agf_buf_ops;
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extern const struct xfs_buf_ops xfs_agi_buf_ops;
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extern const struct xfs_buf_ops xfs_agf_buf_ops;
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extern const struct xfs_buf_ops xfs_agfl_buf_ops;
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extern const struct xfs_buf_ops xfs_allocbt_buf_ops;
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extern const struct xfs_buf_ops xfs_rmapbt_buf_ops;
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extern const struct xfs_buf_ops xfs_refcountbt_buf_ops;
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extern const struct xfs_buf_ops xfs_attr3_leaf_buf_ops;
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extern const struct xfs_buf_ops xfs_attr3_rmt_buf_ops;
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extern const struct xfs_buf_ops xfs_bmbt_buf_ops;
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extern const struct xfs_buf_ops xfs_da3_node_buf_ops;
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extern const struct xfs_buf_ops xfs_dquot_buf_ops;
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extern const struct xfs_buf_ops xfs_symlink_buf_ops;
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extern const struct xfs_buf_ops xfs_agi_buf_ops;
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extern const struct xfs_buf_ops xfs_inobt_buf_ops;
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extern const struct xfs_buf_ops xfs_inode_buf_ops;
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extern const struct xfs_buf_ops xfs_inode_buf_ra_ops;
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extern const struct xfs_buf_ops xfs_dquot_buf_ops;
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extern const struct xfs_buf_ops xfs_dquot_buf_ra_ops;
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extern const struct xfs_buf_ops xfs_sb_buf_ops;
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extern const struct xfs_buf_ops xfs_sb_quiet_buf_ops;
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extern const struct xfs_buf_ops xfs_symlink_buf_ops;
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extern const struct xfs_buf_ops xfs_rtbuf_ops;
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/*
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* This structure is used to track log items associated with
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* a transaction. It points to the log item and keeps some
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* flags to track the state of the log item. It also tracks
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* the amount of space needed to log the item it describes
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* once we get to commit processing (see xfs_trans_commit()).
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*/
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struct xfs_log_item_desc {
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struct xfs_log_item *lid_item;
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struct list_head lid_trans;
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unsigned char lid_flags;
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};
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#define XFS_LID_DIRTY 0x1
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/* log size calculation functions */
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int xfs_log_calc_unit_res(struct xfs_mount *mp, int unit_bytes);
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int xfs_log_calc_minimum_size(struct xfs_mount *);
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/*
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* Values for t_flags.
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*/
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#define XFS_TRANS_DIRTY 0x01 /* something needs to be logged */
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#define XFS_TRANS_SB_DIRTY 0x02 /* superblock is modified */
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#define XFS_TRANS_PERM_LOG_RES 0x04 /* xact took a permanent log res */
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#define XFS_TRANS_SYNC 0x08 /* make commit synchronous */
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#define XFS_TRANS_DQ_DIRTY 0x10 /* at least one dquot in trx dirty */
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#define XFS_TRANS_RESERVE 0x20 /* OK to use reserved data blocks */
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#define XFS_TRANS_NO_WRITECOUNT 0x40 /* do not elevate SB writecount */
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#define XFS_TRANS_NOFS 0x80 /* pass KM_NOFS to kmem_alloc */
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/*
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* Field values for xfs_trans_mod_sb.
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*/
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#define XFS_TRANS_SB_ICOUNT 0x00000001
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#define XFS_TRANS_SB_IFREE 0x00000002
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#define XFS_TRANS_SB_FDBLOCKS 0x00000004
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#define XFS_TRANS_SB_RES_FDBLOCKS 0x00000008
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#define XFS_TRANS_SB_FREXTENTS 0x00000010
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#define XFS_TRANS_SB_RES_FREXTENTS 0x00000020
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#define XFS_TRANS_SB_DBLOCKS 0x00000040
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#define XFS_TRANS_SB_AGCOUNT 0x00000080
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#define XFS_TRANS_SB_IMAXPCT 0x00000100
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#define XFS_TRANS_SB_REXTSIZE 0x00000200
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#define XFS_TRANS_SB_RBMBLOCKS 0x00000400
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#define XFS_TRANS_SB_RBLOCKS 0x00000800
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#define XFS_TRANS_SB_REXTENTS 0x00001000
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#define XFS_TRANS_SB_REXTSLOG 0x00002000
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/*
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* Here we centralize the specification of XFS meta-data buffer reference count
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* values. This determines how hard the buffer cache tries to hold onto the
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* buffer.
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*/
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#define XFS_AGF_REF 4
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#define XFS_AGI_REF 4
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#define XFS_AGFL_REF 3
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#define XFS_INO_BTREE_REF 3
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#define XFS_ALLOC_BTREE_REF 2
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#define XFS_BMAP_BTREE_REF 2
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#define XFS_RMAP_BTREE_REF 2
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#define XFS_DIR_BTREE_REF 2
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#define XFS_INO_REF 2
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#define XFS_ATTR_BTREE_REF 1
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#define XFS_DQUOT_REF 1
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#define XFS_REFC_BTREE_REF 1
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/*
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* Flags for xfs_trans_ichgtime().
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*/
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#define XFS_ICHGTIME_MOD 0x1 /* data fork modification timestamp */
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#define XFS_ICHGTIME_CHG 0x2 /* inode field change timestamp */
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#define XFS_ICHGTIME_CREATE 0x4 /* inode create timestamp */
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/*
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* Symlink decoding/encoding functions
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*/
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int xfs_symlink_blocks(struct xfs_mount *mp, int pathlen);
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int xfs_symlink_hdr_set(struct xfs_mount *mp, xfs_ino_t ino, uint32_t offset,
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uint32_t size, struct xfs_buf *bp);
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bool xfs_symlink_hdr_ok(xfs_ino_t ino, uint32_t offset,
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uint32_t size, struct xfs_buf *bp);
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void xfs_symlink_local_to_remote(struct xfs_trans *tp, struct xfs_buf *bp,
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struct xfs_inode *ip, struct xfs_ifork *ifp);
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#endif /* __XFS_SHARED_H__ */
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