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xfs: Reduce allocations during CIL insertion
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1 /*
2  * Copyright (c) 2000-2002,2005 Silicon Graphics, Inc.
3  * All Rights Reserved.
4  *
5  * This program is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU General Public License as
7  * published by the Free Software Foundation.
8  *
9  * This program is distributed in the hope that it would be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
12  * GNU General Public License for more details.
13  *
14  * You should have received a copy of the GNU General Public License
15  * along with this program; if not, write the Free Software Foundation,
16  * Inc.,  51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
17  */
18 #ifndef __XFS_TRANS_H__
19 #define __XFS_TRANS_H__
20
21 struct xfs_log_item;
22
23 #include "xfs_trans_resv.h"
24
25 /* kernel only transaction subsystem defines */
26
27 struct xfs_buf;
28 struct xfs_buftarg;
29 struct xfs_efd_log_item;
30 struct xfs_efi_log_item;
31 struct xfs_inode;
32 struct xfs_item_ops;
33 struct xfs_log_iovec;
34 struct xfs_log_item_desc;
35 struct xfs_mount;
36 struct xfs_trans;
37 struct xfs_trans_res;
38 struct xfs_dquot_acct;
39 struct xfs_busy_extent;
40
41 typedef struct xfs_log_item {
42         struct list_head                li_ail;         /* AIL pointers */
43         xfs_lsn_t                       li_lsn;         /* last on-disk lsn */
44         struct xfs_log_item_desc        *li_desc;       /* ptr to current desc*/
45         struct xfs_mount                *li_mountp;     /* ptr to fs mount */
46         struct xfs_ail                  *li_ailp;       /* ptr to AIL */
47         uint                            li_type;        /* item type */
48         uint                            li_flags;       /* misc flags */
49         struct xfs_log_item             *li_bio_list;   /* buffer item list */
50         void                            (*li_cb)(struct xfs_buf *,
51                                                  struct xfs_log_item *);
52                                                         /* buffer item iodone */
53                                                         /* callback func */
54         const struct xfs_item_ops       *li_ops;        /* function list */
55
56         /* delayed logging */
57         struct list_head                li_cil;         /* CIL pointers */
58         struct xfs_log_vec              *li_lv;         /* active log vector */
59         xfs_lsn_t                       li_seq;         /* CIL commit seq */
60 } xfs_log_item_t;
61
62 #define XFS_LI_IN_AIL   0x1
63 #define XFS_LI_ABORTED  0x2
64
65 #define XFS_LI_FLAGS \
66         { XFS_LI_IN_AIL,        "IN_AIL" }, \
67         { XFS_LI_ABORTED,       "ABORTED" }
68
69 struct xfs_item_ops {
70         void (*iop_size)(xfs_log_item_t *, int *, int *);
71         void (*iop_format)(xfs_log_item_t *, struct xfs_log_iovec *);
72         void (*iop_pin)(xfs_log_item_t *);
73         void (*iop_unpin)(xfs_log_item_t *, int remove);
74         uint (*iop_push)(struct xfs_log_item *, struct list_head *);
75         void (*iop_unlock)(xfs_log_item_t *);
76         xfs_lsn_t (*iop_committed)(xfs_log_item_t *, xfs_lsn_t);
77         void (*iop_committing)(xfs_log_item_t *, xfs_lsn_t);
78 };
79
80 #define IOP_PIN(ip)             (*(ip)->li_ops->iop_pin)(ip)
81 #define IOP_UNPIN(ip, remove)   (*(ip)->li_ops->iop_unpin)(ip, remove)
82 #define IOP_PUSH(ip, list)      (*(ip)->li_ops->iop_push)(ip, list)
83 #define IOP_UNLOCK(ip)          (*(ip)->li_ops->iop_unlock)(ip)
84 #define IOP_COMMITTED(ip, lsn)  (*(ip)->li_ops->iop_committed)(ip, lsn)
85 #define IOP_COMMITTING(ip, lsn) (*(ip)->li_ops->iop_committing)(ip, lsn)
86
87 /*
88  * Return values for the IOP_PUSH() routines.
89  */
90 #define XFS_ITEM_SUCCESS        0
91 #define XFS_ITEM_PINNED         1
92 #define XFS_ITEM_LOCKED         2
93 #define XFS_ITEM_FLUSHING       3
94
95 /*
96  * This is the type of function which can be given to xfs_trans_callback()
97  * to be called upon the transaction's commit to disk.
98  */
99 typedef void (*xfs_trans_callback_t)(struct xfs_trans *, void *);
100
101 /*
102  * This is the structure maintained for every active transaction.
103  */
104 typedef struct xfs_trans {
105         unsigned int            t_magic;        /* magic number */
106         xfs_log_callback_t      t_logcb;        /* log callback struct */
107         unsigned int            t_type;         /* transaction type */
108         unsigned int            t_log_res;      /* amt of log space resvd */
109         unsigned int            t_log_count;    /* count for perm log res */
110         unsigned int            t_blk_res;      /* # of blocks resvd */
111         unsigned int            t_blk_res_used; /* # of resvd blocks used */
112         unsigned int            t_rtx_res;      /* # of rt extents resvd */
113         unsigned int            t_rtx_res_used; /* # of resvd rt extents used */
114         struct xlog_ticket      *t_ticket;      /* log mgr ticket */
115         xfs_lsn_t               t_lsn;          /* log seq num of start of
116                                                  * transaction. */
117         xfs_lsn_t               t_commit_lsn;   /* log seq num of end of
118                                                  * transaction. */
119         struct xfs_mount        *t_mountp;      /* ptr to fs mount struct */
120         struct xfs_dquot_acct   *t_dqinfo;      /* acctg info for dquots */
121         unsigned int            t_flags;        /* misc flags */
122         int64_t                 t_icount_delta; /* superblock icount change */
123         int64_t                 t_ifree_delta;  /* superblock ifree change */
124         int64_t                 t_fdblocks_delta; /* superblock fdblocks chg */
125         int64_t                 t_res_fdblocks_delta; /* on-disk only chg */
126         int64_t                 t_frextents_delta;/* superblock freextents chg*/
127         int64_t                 t_res_frextents_delta; /* on-disk only chg */
128 #if defined(DEBUG) || defined(XFS_WARN)
129         int64_t                 t_ag_freeblks_delta; /* debugging counter */
130         int64_t                 t_ag_flist_delta; /* debugging counter */
131         int64_t                 t_ag_btree_delta; /* debugging counter */
132 #endif
133         int64_t                 t_dblocks_delta;/* superblock dblocks change */
134         int64_t                 t_agcount_delta;/* superblock agcount change */
135         int64_t                 t_imaxpct_delta;/* superblock imaxpct change */
136         int64_t                 t_rextsize_delta;/* superblock rextsize chg */
137         int64_t                 t_rbmblocks_delta;/* superblock rbmblocks chg */
138         int64_t                 t_rblocks_delta;/* superblock rblocks change */
139         int64_t                 t_rextents_delta;/* superblocks rextents chg */
140         int64_t                 t_rextslog_delta;/* superblocks rextslog chg */
141         struct list_head        t_items;        /* log item descriptors */
142         xfs_trans_header_t      t_header;       /* header for in-log trans */
143         struct list_head        t_busy;         /* list of busy extents */
144         unsigned long           t_pflags;       /* saved process flags state */
145 } xfs_trans_t;
146
147 /*
148  * XFS transaction mechanism exported interfaces that are
149  * actually macros.
150  */
151 #define xfs_trans_get_log_res(tp)       ((tp)->t_log_res)
152 #define xfs_trans_get_log_count(tp)     ((tp)->t_log_count)
153 #define xfs_trans_get_block_res(tp)     ((tp)->t_blk_res)
154 #define xfs_trans_set_sync(tp)          ((tp)->t_flags |= XFS_TRANS_SYNC)
155
156 #if defined(DEBUG) || defined(XFS_WARN)
157 #define xfs_trans_agblocks_delta(tp, d) ((tp)->t_ag_freeblks_delta += (int64_t)d)
158 #define xfs_trans_agflist_delta(tp, d)  ((tp)->t_ag_flist_delta += (int64_t)d)
159 #define xfs_trans_agbtree_delta(tp, d)  ((tp)->t_ag_btree_delta += (int64_t)d)
160 #else
161 #define xfs_trans_agblocks_delta(tp, d)
162 #define xfs_trans_agflist_delta(tp, d)
163 #define xfs_trans_agbtree_delta(tp, d)
164 #endif
165
166 /*
167  * XFS transaction mechanism exported interfaces.
168  */
169 xfs_trans_t     *xfs_trans_alloc(struct xfs_mount *, uint);
170 xfs_trans_t     *_xfs_trans_alloc(struct xfs_mount *, uint, xfs_km_flags_t);
171 xfs_trans_t     *xfs_trans_dup(xfs_trans_t *);
172 int             xfs_trans_reserve(struct xfs_trans *, struct xfs_trans_res *,
173                                   uint, uint);
174 void            xfs_trans_mod_sb(xfs_trans_t *, uint, int64_t);
175
176 struct xfs_buf  *xfs_trans_get_buf_map(struct xfs_trans *tp,
177                                        struct xfs_buftarg *target,
178                                        struct xfs_buf_map *map, int nmaps,
179                                        uint flags);
180
181 static inline struct xfs_buf *
182 xfs_trans_get_buf(
183         struct xfs_trans        *tp,
184         struct xfs_buftarg      *target,
185         xfs_daddr_t             blkno,
186         int                     numblks,
187         uint                    flags)
188 {
189         DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
190         return xfs_trans_get_buf_map(tp, target, &map, 1, flags);
191 }
192
193 int             xfs_trans_read_buf_map(struct xfs_mount *mp,
194                                        struct xfs_trans *tp,
195                                        struct xfs_buftarg *target,
196                                        struct xfs_buf_map *map, int nmaps,
197                                        xfs_buf_flags_t flags,
198                                        struct xfs_buf **bpp,
199                                        const struct xfs_buf_ops *ops);
200
201 static inline int
202 xfs_trans_read_buf(
203         struct xfs_mount        *mp,
204         struct xfs_trans        *tp,
205         struct xfs_buftarg      *target,
206         xfs_daddr_t             blkno,
207         int                     numblks,
208         xfs_buf_flags_t         flags,
209         struct xfs_buf          **bpp,
210         const struct xfs_buf_ops *ops)
211 {
212         DEFINE_SINGLE_BUF_MAP(map, blkno, numblks);
213         return xfs_trans_read_buf_map(mp, tp, target, &map, 1,
214                                       flags, bpp, ops);
215 }
216
217 struct xfs_buf  *xfs_trans_getsb(xfs_trans_t *, struct xfs_mount *, int);
218
219 void            xfs_trans_brelse(xfs_trans_t *, struct xfs_buf *);
220 void            xfs_trans_bjoin(xfs_trans_t *, struct xfs_buf *);
221 void            xfs_trans_bhold(xfs_trans_t *, struct xfs_buf *);
222 void            xfs_trans_bhold_release(xfs_trans_t *, struct xfs_buf *);
223 void            xfs_trans_binval(xfs_trans_t *, struct xfs_buf *);
224 void            xfs_trans_inode_buf(xfs_trans_t *, struct xfs_buf *);
225 void            xfs_trans_stale_inode_buf(xfs_trans_t *, struct xfs_buf *);
226 void            xfs_trans_ordered_buf(xfs_trans_t *, struct xfs_buf *);
227 void            xfs_trans_dquot_buf(xfs_trans_t *, struct xfs_buf *, uint);
228 void            xfs_trans_inode_alloc_buf(xfs_trans_t *, struct xfs_buf *);
229 void            xfs_trans_ichgtime(struct xfs_trans *, struct xfs_inode *, int);
230 void            xfs_trans_ijoin(struct xfs_trans *, struct xfs_inode *, uint);
231 void            xfs_trans_log_buf(xfs_trans_t *, struct xfs_buf *, uint, uint);
232 void            xfs_trans_log_inode(xfs_trans_t *, struct xfs_inode *, uint);
233 struct xfs_efi_log_item *xfs_trans_get_efi(xfs_trans_t *, uint);
234 void            xfs_efi_release(struct xfs_efi_log_item *, uint);
235 void            xfs_trans_log_efi_extent(xfs_trans_t *,
236                                          struct xfs_efi_log_item *,
237                                          xfs_fsblock_t,
238                                          xfs_extlen_t);
239 struct xfs_efd_log_item *xfs_trans_get_efd(xfs_trans_t *,
240                                   struct xfs_efi_log_item *,
241                                   uint);
242 void            xfs_trans_log_efd_extent(xfs_trans_t *,
243                                          struct xfs_efd_log_item *,
244                                          xfs_fsblock_t,
245                                          xfs_extlen_t);
246 int             xfs_trans_commit(xfs_trans_t *, uint flags);
247 void            xfs_trans_cancel(xfs_trans_t *, int);
248 int             xfs_trans_ail_init(struct xfs_mount *);
249 void            xfs_trans_ail_destroy(struct xfs_mount *);
250
251 extern kmem_zone_t      *xfs_trans_zone;
252 extern kmem_zone_t      *xfs_log_item_desc_zone;
253
254 #endif  /* __XFS_TRANS_H__ */