tjh.dev
Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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linux
1/*
2 * Copyright (c) 2000-2006 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_BMAP_H__
19#define __XFS_BMAP_H__
20
21struct getbmap;
22struct xfs_bmbt_irec;
23struct xfs_ifork;
24struct xfs_inode;
25struct xfs_mount;
26struct xfs_trans;
27
28extern kmem_zone_t *xfs_bmap_free_item_zone;
29
30/*
31 * List of extents to be free "later".
32 * The list is kept sorted on xbf_startblock.
33 */
34typedef struct xfs_bmap_free_item
35{
36 xfs_fsblock_t xbfi_startblock;/* starting fs block number */
37 xfs_extlen_t xbfi_blockcount;/* number of blocks in extent */
38 struct xfs_bmap_free_item *xbfi_next; /* link to next entry */
39} xfs_bmap_free_item_t;
40
41/*
42 * Header for free extent list.
43 *
44 * xbf_low is used by the allocator to activate the lowspace algorithm -
45 * when free space is running low the extent allocator may choose to
46 * allocate an extent from an AG without leaving sufficient space for
47 * a btree split when inserting the new extent. In this case the allocator
48 * will enable the lowspace algorithm which is supposed to allow further
49 * allocations (such as btree splits and newroots) to allocate from
50 * sequential AGs. In order to avoid locking AGs out of order the lowspace
51 * algorithm will start searching for free space from AG 0. If the correct
52 * transaction reservations have been made then this algorithm will eventually
53 * find all the space it needs.
54 */
55typedef struct xfs_bmap_free
56{
57 xfs_bmap_free_item_t *xbf_first; /* list of to-be-free extents */
58 int xbf_count; /* count of items on list */
59 int xbf_low; /* alloc in low mode */
60} xfs_bmap_free_t;
61
62#define XFS_BMAP_MAX_NMAP 4
63
64/*
65 * Flags for xfs_bmapi_*
66 */
67#define XFS_BMAPI_ENTIRE 0x001 /* return entire extent, not trimmed */
68#define XFS_BMAPI_METADATA 0x002 /* mapping metadata not user data */
69#define XFS_BMAPI_ATTRFORK 0x004 /* use attribute fork not data */
70#define XFS_BMAPI_PREALLOC 0x008 /* preallocation op: unwritten space */
71#define XFS_BMAPI_IGSTATE 0x010 /* Ignore state - */
72 /* combine contig. space */
73#define XFS_BMAPI_CONTIG 0x020 /* must allocate only one extent */
74/*
75 * unwritten extent conversion - this needs write cache flushing and no additional
76 * allocation alignments. When specified with XFS_BMAPI_PREALLOC it converts
77 * from written to unwritten, otherwise convert from unwritten to written.
78 */
79#define XFS_BMAPI_CONVERT 0x040
80
81#define XFS_BMAPI_FLAGS \
82 { XFS_BMAPI_ENTIRE, "ENTIRE" }, \
83 { XFS_BMAPI_METADATA, "METADATA" }, \
84 { XFS_BMAPI_ATTRFORK, "ATTRFORK" }, \
85 { XFS_BMAPI_PREALLOC, "PREALLOC" }, \
86 { XFS_BMAPI_IGSTATE, "IGSTATE" }, \
87 { XFS_BMAPI_CONTIG, "CONTIG" }, \
88 { XFS_BMAPI_CONVERT, "CONVERT" }
89
90
91static inline int xfs_bmapi_aflag(int w)
92{
93 return (w == XFS_ATTR_FORK ? XFS_BMAPI_ATTRFORK : 0);
94}
95
96/*
97 * Special values for xfs_bmbt_irec_t br_startblock field.
98 */
99#define DELAYSTARTBLOCK ((xfs_fsblock_t)-1LL)
100#define HOLESTARTBLOCK ((xfs_fsblock_t)-2LL)
101
102static inline void xfs_bmap_init(xfs_bmap_free_t *flp, xfs_fsblock_t *fbp)
103{
104 ((flp)->xbf_first = NULL, (flp)->xbf_count = 0, \
105 (flp)->xbf_low = 0, *(fbp) = NULLFSBLOCK);
106}
107
108/*
109 * Argument structure for xfs_bmap_alloc.
110 */
111typedef struct xfs_bmalloca {
112 xfs_fsblock_t *firstblock; /* i/o first block allocated */
113 struct xfs_bmap_free *flist; /* bmap freelist */
114 struct xfs_trans *tp; /* transaction pointer */
115 struct xfs_inode *ip; /* incore inode pointer */
116 struct xfs_bmbt_irec prev; /* extent before the new one */
117 struct xfs_bmbt_irec got; /* extent after, or delayed */
118
119 xfs_fileoff_t offset; /* offset in file filling in */
120 xfs_extlen_t length; /* i/o length asked/allocated */
121 xfs_fsblock_t blkno; /* starting block of new extent */
122
123 struct xfs_btree_cur *cur; /* btree cursor */
124 xfs_extnum_t idx; /* current extent index */
125 int nallocs;/* number of extents alloc'd */
126 int logflags;/* flags for transaction logging */
127
128 xfs_extlen_t total; /* total blocks needed for xaction */
129 xfs_extlen_t minlen; /* minimum allocation size (blocks) */
130 xfs_extlen_t minleft; /* amount must be left after alloc */
131 char eof; /* set if allocating past last extent */
132 char wasdel; /* replacing a delayed allocation */
133 char userdata;/* set if is user data */
134 char aeof; /* allocated space at eof */
135 char conv; /* overwriting unwritten extents */
136} xfs_bmalloca_t;
137
138/*
139 * Flags for xfs_bmap_add_extent*.
140 */
141#define BMAP_LEFT_CONTIG (1 << 0)
142#define BMAP_RIGHT_CONTIG (1 << 1)
143#define BMAP_LEFT_FILLING (1 << 2)
144#define BMAP_RIGHT_FILLING (1 << 3)
145#define BMAP_LEFT_DELAY (1 << 4)
146#define BMAP_RIGHT_DELAY (1 << 5)
147#define BMAP_LEFT_VALID (1 << 6)
148#define BMAP_RIGHT_VALID (1 << 7)
149#define BMAP_ATTRFORK (1 << 8)
150
151#define XFS_BMAP_EXT_FLAGS \
152 { BMAP_LEFT_CONTIG, "LC" }, \
153 { BMAP_RIGHT_CONTIG, "RC" }, \
154 { BMAP_LEFT_FILLING, "LF" }, \
155 { BMAP_RIGHT_FILLING, "RF" }, \
156 { BMAP_ATTRFORK, "ATTR" }
157
158#if defined(__KERNEL) && defined(DEBUG)
159void xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt,
160 int whichfork, unsigned long caller_ip);
161#define XFS_BMAP_TRACE_EXLIST(ip,c,w) \
162 xfs_bmap_trace_exlist(ip,c,w, _THIS_IP_)
163#else
164#define XFS_BMAP_TRACE_EXLIST(ip,c,w)
165#endif
166
167int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
168void xfs_bmap_add_free(xfs_fsblock_t bno, xfs_filblks_t len,
169 struct xfs_bmap_free *flist, struct xfs_mount *mp);
170void xfs_bmap_cancel(struct xfs_bmap_free *flist);
171void xfs_bmap_compute_maxlevels(struct xfs_mount *mp, int whichfork);
172int xfs_bmap_first_unused(struct xfs_trans *tp, struct xfs_inode *ip,
173 xfs_extlen_t len, xfs_fileoff_t *unused, int whichfork);
174int xfs_bmap_last_before(struct xfs_trans *tp, struct xfs_inode *ip,
175 xfs_fileoff_t *last_block, int whichfork);
176int xfs_bmap_last_offset(struct xfs_trans *tp, struct xfs_inode *ip,
177 xfs_fileoff_t *unused, int whichfork);
178int xfs_bmap_one_block(struct xfs_inode *ip, int whichfork);
179int xfs_bmap_read_extents(struct xfs_trans *tp, struct xfs_inode *ip,
180 int whichfork);
181int xfs_bmapi_read(struct xfs_inode *ip, xfs_fileoff_t bno,
182 xfs_filblks_t len, struct xfs_bmbt_irec *mval,
183 int *nmap, int flags);
184int xfs_bmapi_delay(struct xfs_inode *ip, xfs_fileoff_t bno,
185 xfs_filblks_t len, struct xfs_bmbt_irec *mval,
186 int *nmap, int flags);
187int xfs_bmapi_write(struct xfs_trans *tp, struct xfs_inode *ip,
188 xfs_fileoff_t bno, xfs_filblks_t len, int flags,
189 xfs_fsblock_t *firstblock, xfs_extlen_t total,
190 struct xfs_bmbt_irec *mval, int *nmap,
191 struct xfs_bmap_free *flist);
192int xfs_bunmapi(struct xfs_trans *tp, struct xfs_inode *ip,
193 xfs_fileoff_t bno, xfs_filblks_t len, int flags,
194 xfs_extnum_t nexts, xfs_fsblock_t *firstblock,
195 struct xfs_bmap_free *flist, int *done);
196int xfs_check_nostate_extents(struct xfs_ifork *ifp, xfs_extnum_t idx,
197 xfs_extnum_t num);
198uint xfs_default_attroffset(struct xfs_inode *ip);
199
200#ifdef __KERNEL__
201/* bmap to userspace formatter - copy to user & advance pointer */
202typedef int (*xfs_bmap_format_t)(void **, struct getbmapx *, int *);
203
204int xfs_bmap_finish(struct xfs_trans **tp, struct xfs_bmap_free *flist,
205 int *committed);
206int xfs_getbmap(struct xfs_inode *ip, struct getbmapx *bmv,
207 xfs_bmap_format_t formatter, void *arg);
208int xfs_bmap_eof(struct xfs_inode *ip, xfs_fileoff_t endoff,
209 int whichfork, int *eof);
210int xfs_bmap_count_blocks(struct xfs_trans *tp, struct xfs_inode *ip,
211 int whichfork, int *count);
212int xfs_bmap_punch_delalloc_range(struct xfs_inode *ip,
213 xfs_fileoff_t start_fsb, xfs_fileoff_t length);
214#endif /* __KERNEL__ */
215
216#endif /* __XFS_BMAP_H__ */