mirror of https://gitee.com/openkylin/linux.git
173 lines
5.4 KiB
C
173 lines
5.4 KiB
C
/*
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* Copyright (c) 2000-2001,2005 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_BUF_ITEM_H__
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#define __XFS_BUF_ITEM_H__
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extern kmem_zone_t *xfs_buf_item_zone;
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/*
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* This flag indicates that the buffer contains on disk inodes
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* and requires special recovery handling.
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*/
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#define XFS_BLF_INODE_BUF (1<<0)
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/*
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* This flag indicates that the buffer should not be replayed
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* during recovery because its blocks are being freed.
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*/
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#define XFS_BLF_CANCEL (1<<1)
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/*
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* This flag indicates that the buffer contains on disk
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* user or group dquots and may require special recovery handling.
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*/
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#define XFS_BLF_UDQUOT_BUF (1<<2)
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#define XFS_BLF_PDQUOT_BUF (1<<3)
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#define XFS_BLF_GDQUOT_BUF (1<<4)
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#define XFS_BLF_CHUNK 128
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#define XFS_BLF_SHIFT 7
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#define BIT_TO_WORD_SHIFT 5
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#define NBWORD (NBBY * sizeof(unsigned int))
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/*
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* This is the structure used to lay out a buf log item in the
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* log. The data map describes which 128 byte chunks of the buffer
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* have been logged.
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*/
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#define XFS_BLF_DATAMAP_SIZE ((XFS_MAX_BLOCKSIZE / XFS_BLF_CHUNK) / NBWORD)
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typedef struct xfs_buf_log_format {
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unsigned short blf_type; /* buf log item type indicator */
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unsigned short blf_size; /* size of this item */
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ushort blf_flags; /* misc state */
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ushort blf_len; /* number of blocks in this buf */
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__int64_t blf_blkno; /* starting blkno of this buf */
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unsigned int blf_map_size; /* used size of data bitmap in words */
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unsigned int blf_data_map[XFS_BLF_DATAMAP_SIZE]; /* dirty bitmap */
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} xfs_buf_log_format_t;
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/*
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* All buffers now need to tell recovery where the magic number
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* is so that it can verify and calculate the CRCs on the buffer correctly
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* once the changes have been replayed into the buffer.
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*
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* The type value is held in the upper 5 bits of the blf_flags field, which is
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* an unsigned 16 bit field. Hence we need to shift it 11 bits up and down.
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*/
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#define XFS_BLFT_BITS 5
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#define XFS_BLFT_SHIFT 11
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#define XFS_BLFT_MASK (((1 << XFS_BLFT_BITS) - 1) << XFS_BLFT_SHIFT)
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enum xfs_blft {
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XFS_BLFT_UNKNOWN_BUF = 0,
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XFS_BLFT_UDQUOT_BUF,
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XFS_BLFT_PDQUOT_BUF,
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XFS_BLFT_GDQUOT_BUF,
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XFS_BLFT_BTREE_BUF,
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XFS_BLFT_AGF_BUF,
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XFS_BLFT_AGFL_BUF,
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XFS_BLFT_AGI_BUF,
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XFS_BLFT_DINO_BUF,
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XFS_BLFT_SYMLINK_BUF,
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XFS_BLFT_DIR_BLOCK_BUF,
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XFS_BLFT_DIR_DATA_BUF,
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XFS_BLFT_DIR_FREE_BUF,
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XFS_BLFT_DIR_LEAF1_BUF,
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XFS_BLFT_DIR_LEAFN_BUF,
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XFS_BLFT_DA_NODE_BUF,
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XFS_BLFT_ATTR_LEAF_BUF,
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XFS_BLFT_ATTR_RMT_BUF,
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XFS_BLFT_SB_BUF,
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XFS_BLFT_MAX_BUF = (1 << XFS_BLFT_BITS),
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};
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static inline void
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xfs_blft_to_flags(struct xfs_buf_log_format *blf, enum xfs_blft type)
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{
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ASSERT(type > XFS_BLFT_UNKNOWN_BUF && type < XFS_BLFT_MAX_BUF);
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blf->blf_flags &= ~XFS_BLFT_MASK;
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blf->blf_flags |= ((type << XFS_BLFT_SHIFT) & XFS_BLFT_MASK);
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}
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static inline __uint16_t
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xfs_blft_from_flags(struct xfs_buf_log_format *blf)
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{
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return (blf->blf_flags & XFS_BLFT_MASK) >> XFS_BLFT_SHIFT;
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}
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/*
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* buf log item flags
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*/
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#define XFS_BLI_HOLD 0x01
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#define XFS_BLI_DIRTY 0x02
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#define XFS_BLI_STALE 0x04
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#define XFS_BLI_LOGGED 0x08
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#define XFS_BLI_INODE_ALLOC_BUF 0x10
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#define XFS_BLI_STALE_INODE 0x20
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#define XFS_BLI_INODE_BUF 0x40
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#define XFS_BLI_FLAGS \
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{ XFS_BLI_HOLD, "HOLD" }, \
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{ XFS_BLI_DIRTY, "DIRTY" }, \
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{ XFS_BLI_STALE, "STALE" }, \
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{ XFS_BLI_LOGGED, "LOGGED" }, \
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{ XFS_BLI_INODE_ALLOC_BUF, "INODE_ALLOC" }, \
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{ XFS_BLI_STALE_INODE, "STALE_INODE" }, \
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{ XFS_BLI_INODE_BUF, "INODE_BUF" }
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#ifdef __KERNEL__
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struct xfs_buf;
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struct xfs_mount;
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struct xfs_buf_log_item;
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/*
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* This is the in core log item structure used to track information
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* needed to log buffers. It tracks how many times the lock has been
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* locked, and which 128 byte chunks of the buffer are dirty.
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*/
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typedef struct xfs_buf_log_item {
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xfs_log_item_t bli_item; /* common item structure */
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struct xfs_buf *bli_buf; /* real buffer pointer */
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unsigned int bli_flags; /* misc flags */
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unsigned int bli_recur; /* lock recursion count */
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atomic_t bli_refcount; /* cnt of tp refs */
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int bli_format_count; /* count of headers */
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struct xfs_buf_log_format *bli_formats; /* array of in-log header ptrs */
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struct xfs_buf_log_format __bli_format; /* embedded in-log header */
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} xfs_buf_log_item_t;
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void xfs_buf_item_init(struct xfs_buf *, struct xfs_mount *);
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void xfs_buf_item_relse(struct xfs_buf *);
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void xfs_buf_item_log(xfs_buf_log_item_t *, uint, uint);
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uint xfs_buf_item_dirty(xfs_buf_log_item_t *);
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void xfs_buf_attach_iodone(struct xfs_buf *,
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void(*)(struct xfs_buf *, xfs_log_item_t *),
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xfs_log_item_t *);
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void xfs_buf_iodone_callbacks(struct xfs_buf *);
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void xfs_buf_iodone(struct xfs_buf *, struct xfs_log_item *);
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void xfs_trans_buf_set_type(struct xfs_trans *, struct xfs_buf *,
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enum xfs_blft);
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void xfs_trans_buf_copy_type(struct xfs_buf *dst_bp, struct xfs_buf *src_bp);
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#endif /* __KERNEL__ */
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#endif /* __XFS_BUF_ITEM_H__ */
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