root/fs/xfs/xfs_trans.h

INCLUDED FROM

DEFINITIONS

1. xfs_trans_get_buf
2. xfs_trans_read_buf

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
   4  * All Rights Reserved.
   5  */
   6 #ifndef __XFS_TRANS_H__
   7 #define __XFS_TRANS_H__
   8 
   9 /* kernel only transaction subsystem defines */
  10 
  11 struct xfs_buf;
  12 struct xfs_buftarg;
  13 struct xfs_efd_log_item;
  14 struct xfs_efi_log_item;
  15 struct xfs_inode;
  16 struct xfs_item_ops;
  17 struct xfs_log_iovec;
  18 struct xfs_mount;
  19 struct xfs_trans;
  20 struct xfs_trans_res;
  21 struct xfs_dquot_acct;
  22 struct xfs_rud_log_item;
  23 struct xfs_rui_log_item;
  24 struct xfs_btree_cur;
  25 struct xfs_cui_log_item;
  26 struct xfs_cud_log_item;
  27 struct xfs_bui_log_item;
  28 struct xfs_bud_log_item;
  29 
  30 struct xfs_log_item {
  31         struct list_head                li_ail;         /* AIL pointers */
  32         struct list_head                li_trans;       /* transaction list */
  33         xfs_lsn_t                       li_lsn;         /* last on-disk lsn */
  34         struct xfs_mount                *li_mountp;     /* ptr to fs mount */
  35         struct xfs_ail                  *li_ailp;       /* ptr to AIL */
  36         uint                            li_type;        /* item type */
  37         unsigned long                   li_flags;       /* misc flags */
  38         struct xfs_buf                  *li_buf;        /* real buffer pointer */
  39         struct list_head                li_bio_list;    /* buffer item list */
  40         void                            (*li_cb)(struct xfs_buf *,
  41                                                  struct xfs_log_item *);
  42                                                         /* buffer item iodone */
  43                                                         /* callback func */
  44         const struct xfs_item_ops       *li_ops;        /* function list */
  45 
  46         /* delayed logging */
  47         struct list_head                li_cil;         /* CIL pointers */
  48         struct xfs_log_vec              *li_lv;         /* active log vector */
  49         struct xfs_log_vec              *li_lv_shadow;  /* standby vector */
  50         xfs_lsn_t                       li_seq;         /* CIL commit seq */
  51 };
  52 
  53 /*
  54  * li_flags use the (set/test/clear)_bit atomic interfaces because updates can
  55  * race with each other and we don't want to have to use the AIL lock to
  56  * serialise all updates.
  57  */
  58 #define XFS_LI_IN_AIL   0
  59 #define XFS_LI_ABORTED  1
  60 #define XFS_LI_FAILED   2
  61 #define XFS_LI_DIRTY    3       /* log item dirty in transaction */
  62 
  63 #define XFS_LI_FLAGS \
  64         { (1 << XFS_LI_IN_AIL),         "IN_AIL" }, \
  65         { (1 << XFS_LI_ABORTED),        "ABORTED" }, \
  66         { (1 << XFS_LI_FAILED),         "FAILED" }, \
  67         { (1 << XFS_LI_DIRTY),          "DIRTY" }
  68 
  69 struct xfs_item_ops {
  70         unsigned flags;
  71         void (*iop_size)(struct xfs_log_item *, int *, int *);
  72         void (*iop_format)(struct xfs_log_item *, struct xfs_log_vec *);
  73         void (*iop_pin)(struct xfs_log_item *);
  74         void (*iop_unpin)(struct xfs_log_item *, int remove);
  75         uint (*iop_push)(struct xfs_log_item *, struct list_head *);
  76         void (*iop_committing)(struct xfs_log_item *, xfs_lsn_t commit_lsn);
  77         void (*iop_release)(struct xfs_log_item *);
  78         xfs_lsn_t (*iop_committed)(struct xfs_log_item *, xfs_lsn_t);
  79         void (*iop_error)(struct xfs_log_item *, xfs_buf_t *);
  80 };
  81 
  82 /*
  83  * Release the log item as soon as committed.  This is for items just logging
  84  * intents that never need to be written back in place.
  85  */
  86 #define XFS_ITEM_RELEASE_WHEN_COMMITTED (1 << 0)
  87 
  88 void    xfs_log_item_init(struct xfs_mount *mp, struct xfs_log_item *item,
  89                           int type, const struct xfs_item_ops *ops);
  90 
  91 /*
  92  * Return values for the iop_push() routines.
  93  */
  94 #define XFS_ITEM_SUCCESS        0
  95 #define XFS_ITEM_PINNED         1
  96 #define XFS_ITEM_LOCKED         2
  97 #define XFS_ITEM_FLUSHING       3
  98 
  99 /*
 100  * Deferred operation item relogging limits.
 101  */
 102 #define XFS_DEFER_OPS_NR_INODES 2       /* join up to two inodes */
 103 #define XFS_DEFER_OPS_NR_BUFS   2       /* join up to two buffers */
 104 
 105 /*
 106  * This is the structure maintained for every active transaction.
 107  */
 108 typedef struct xfs_trans {
 109         unsigned int            t_magic;        /* magic number */
 110         unsigned int            t_log_res;      /* amt of log space resvd */
 111         unsigned int            t_log_count;    /* count for perm log res */
 112         unsigned int            t_blk_res;      /* # of blocks resvd */
 113         unsigned int            t_blk_res_used; /* # of resvd blocks used */
 114         unsigned int            t_rtx_res;      /* # of rt extents resvd */
 115         unsigned int            t_rtx_res_used; /* # of resvd rt extents used */
 116         unsigned int            t_flags;        /* misc flags */
 117         xfs_fsblock_t           t_firstblock;   /* first block allocated */
 118         struct xlog_ticket      *t_ticket;      /* log mgr ticket */
 119         struct xfs_mount        *t_mountp;      /* ptr to fs mount struct */
 120         struct xfs_dquot_acct   *t_dqinfo;      /* acctg info for dquots */
 121         int64_t                 t_icount_delta; /* superblock icount change */
 122         int64_t                 t_ifree_delta;  /* superblock ifree change */
 123         int64_t                 t_fdblocks_delta; /* superblock fdblocks chg */
 124         int64_t                 t_res_fdblocks_delta; /* on-disk only chg */
 125         int64_t                 t_frextents_delta;/* superblock freextents chg*/
 126         int64_t                 t_res_frextents_delta; /* on-disk only chg */
 127 #if defined(DEBUG) || defined(XFS_WARN)
 128         int64_t                 t_ag_freeblks_delta; /* debugging counter */
 129         int64_t                 t_ag_flist_delta; /* debugging counter */
 130         int64_t                 t_ag_btree_delta; /* debugging counter */
 131 #endif
 132         int64_t                 t_dblocks_delta;/* superblock dblocks change */
 133         int64_t                 t_agcount_delta;/* superblock agcount change */
 134         int64_t                 t_imaxpct_delta;/* superblock imaxpct change */
 135         int64_t                 t_rextsize_delta;/* superblock rextsize chg */
 136         int64_t                 t_rbmblocks_delta;/* superblock rbmblocks chg */
 137         int64_t                 t_rblocks_delta;/* superblock rblocks change */
 138         int64_t                 t_rextents_delta;/* superblocks rextents chg */
 139         int64_t                 t_rextslog_delta;/* superblocks rextslog chg */
 140         struct list_head        t_items;        /* log item descriptors */
 141         struct list_head        t_busy;         /* list of busy extents */
 142         struct list_head        t_dfops;        /* deferred operations */
 143         unsigned long           t_pflags;       /* saved process flags state */
 144 } xfs_trans_t;
 145 
 146 /*
 147  * XFS transaction mechanism exported interfaces that are
 148  * actually macros.
 149  */
 150 #define xfs_trans_set_sync(tp)          ((tp)->t_flags |= XFS_TRANS_SYNC)
 151 
 152 #if defined(DEBUG) || defined(XFS_WARN)
 153 #define xfs_trans_agblocks_delta(tp, d) ((tp)->t_ag_freeblks_delta += (int64_t)d)
 154 #define xfs_trans_agflist_delta(tp, d)  ((tp)->t_ag_flist_delta += (int64_t)d)
 155 #define xfs_trans_agbtree_delta(tp, d)  ((tp)->t_ag_btree_delta += (int64_t)d)
 156 #else
 157 #define xfs_trans_agblocks_delta(tp, d)
 158 #define xfs_trans_agflist_delta(tp, d)
 159 #define xfs_trans_agbtree_delta(tp, d)
 160 #endif
 161 
 162 /*
 163  * XFS transaction mechanism exported interfaces.
 164  */
 165 int             xfs_trans_alloc(struct xfs_mount *mp, struct xfs_trans_res *resp,
 166                         uint blocks, uint rtextents, uint flags,
 167                         struct xfs_trans **tpp);
 168 int             xfs_trans_alloc_empty(struct xfs_mount *mp,
 169                         struct xfs_trans **tpp);
 170 void            xfs_trans_mod_sb(xfs_trans_t *, uint, int64_t);
 171 
 172 struct xfs_buf  *xfs_trans_get_buf_map(struct xfs_trans *tp,
 173                                        struct xfs_buftarg *target,
 174                                        struct xfs_buf_map *map, int nmaps,
 175                                        uint flags);
 176 
 177 static inline struct xfs_buf *
 178 xfs_trans_get_buf(
 179         struct xfs_trans        *tp,
 180         struct xfs_buftarg      *target,
 181         xfs_daddr_t             blkno,
 182         int                     numblks,
 183         uint                    flags)
 184 {
 185         DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
 186         return xfs_trans_get_buf_map(tp, target, &map, 1, flags);
 187 }
 188 
 189 int             xfs_trans_read_buf_map(struct xfs_mount *mp,
 190                                        struct xfs_trans *tp,
 191                                        struct xfs_buftarg *target,
 192                                        struct xfs_buf_map *map, int nmaps,
 193                                        xfs_buf_flags_t flags,
 194                                        struct xfs_buf **bpp,
 195                                        const struct xfs_buf_ops *ops);
 196 
 197 static inline int
 198 xfs_trans_read_buf(
 199         struct xfs_mount        *mp,
 200         struct xfs_trans        *tp,
 201         struct xfs_buftarg      *target,
 202         xfs_daddr_t             blkno,
 203         int                     numblks,
 204         xfs_buf_flags_t         flags,
 205         struct xfs_buf          **bpp,
 206         const struct xfs_buf_ops *ops)
 207 {
 208         DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
 209         return xfs_trans_read_buf_map(mp, tp, target, &map, 1,
 210                                       flags, bpp, ops);
 211 }
 212 
 213 struct xfs_buf  *xfs_trans_getsb(xfs_trans_t *, struct xfs_mount *);
 214 
 215 void            xfs_trans_brelse(xfs_trans_t *, struct xfs_buf *);
 216 void            xfs_trans_bjoin(xfs_trans_t *, struct xfs_buf *);
 217 void            xfs_trans_bhold(xfs_trans_t *, struct xfs_buf *);
 218 void            xfs_trans_bhold_release(xfs_trans_t *, struct xfs_buf *);
 219 void            xfs_trans_binval(xfs_trans_t *, struct xfs_buf *);
 220 void            xfs_trans_inode_buf(xfs_trans_t *, struct xfs_buf *);
 221 void            xfs_trans_stale_inode_buf(xfs_trans_t *, struct xfs_buf *);
 222 bool            xfs_trans_ordered_buf(xfs_trans_t *, struct xfs_buf *);
 223 void            xfs_trans_dquot_buf(xfs_trans_t *, struct xfs_buf *, uint);
 224 void            xfs_trans_inode_alloc_buf(xfs_trans_t *, struct xfs_buf *);
 225 void            xfs_trans_ichgtime(struct xfs_trans *, struct xfs_inode *, int);
 226 void            xfs_trans_ijoin(struct xfs_trans *, struct xfs_inode *, uint);
 227 void            xfs_trans_log_buf(struct xfs_trans *, struct xfs_buf *, uint,
 228                                   uint);
 229 void            xfs_trans_dirty_buf(struct xfs_trans *, struct xfs_buf *);
 230 bool            xfs_trans_buf_is_dirty(struct xfs_buf *bp);
 231 void            xfs_trans_log_inode(xfs_trans_t *, struct xfs_inode *, uint);
 232 
 233 int             xfs_trans_commit(struct xfs_trans *);
 234 int             xfs_trans_roll(struct xfs_trans **);
 235 int             xfs_trans_roll_inode(struct xfs_trans **, struct xfs_inode *);
 236 void            xfs_trans_cancel(xfs_trans_t *);
 237 int             xfs_trans_ail_init(struct xfs_mount *);
 238 void            xfs_trans_ail_destroy(struct xfs_mount *);
 239 
 240 void            xfs_trans_buf_set_type(struct xfs_trans *, struct xfs_buf *,
 241                                        enum xfs_blft);
 242 void            xfs_trans_buf_copy_type(struct xfs_buf *dst_bp,
 243                                         struct xfs_buf *src_bp);
 244 
 245 extern kmem_zone_t      *xfs_trans_zone;
 246 
 247 #endif  /* __XFS_TRANS_H__ */