xref: /openbmc/linux/fs/xfs/xfs_mount.h (revision 64c70b1c)
1 /*
2  * Copyright (c) 2000-2005 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_MOUNT_H__
19 #define	__XFS_MOUNT_H__
20 
21 
22 typedef struct xfs_trans_reservations {
23 	uint	tr_write;	/* extent alloc trans */
24 	uint	tr_itruncate;	/* truncate trans */
25 	uint	tr_rename;	/* rename trans */
26 	uint	tr_link;	/* link trans */
27 	uint	tr_remove;	/* unlink trans */
28 	uint	tr_symlink;	/* symlink trans */
29 	uint	tr_create;	/* create trans */
30 	uint	tr_mkdir;	/* mkdir trans */
31 	uint	tr_ifree;	/* inode free trans */
32 	uint	tr_ichange;	/* inode update trans */
33 	uint	tr_growdata;	/* fs data section grow trans */
34 	uint	tr_swrite;	/* sync write inode trans */
35 	uint	tr_addafork;	/* cvt inode to attributed trans */
36 	uint	tr_writeid;	/* write setuid/setgid file */
37 	uint	tr_attrinval;	/* attr fork buffer invalidation */
38 	uint	tr_attrset;	/* set/create an attribute */
39 	uint	tr_attrrm;	/* remove an attribute */
40 	uint	tr_clearagi;	/* clear bad agi unlinked ino bucket */
41 	uint	tr_growrtalloc;	/* grow realtime allocations */
42 	uint	tr_growrtzero;	/* grow realtime zeroing */
43 	uint	tr_growrtfree;	/* grow realtime freeing */
44 } xfs_trans_reservations_t;
45 
46 #ifndef __KERNEL__
47 /*
48  * Moved here from xfs_ag.h to avoid reordering header files
49  */
50 #define XFS_DADDR_TO_AGNO(mp,d) \
51 	((xfs_agnumber_t)(XFS_BB_TO_FSBT(mp, d) / (mp)->m_sb.sb_agblocks))
52 #define XFS_DADDR_TO_AGBNO(mp,d) \
53 	((xfs_agblock_t)(XFS_BB_TO_FSBT(mp, d) % (mp)->m_sb.sb_agblocks))
54 #else
55 struct cred;
56 struct log;
57 struct bhv_vfs;
58 struct bhv_vnode;
59 struct xfs_mount_args;
60 struct xfs_ihash;
61 struct xfs_chash;
62 struct xfs_inode;
63 struct xfs_perag;
64 struct xfs_iocore;
65 struct xfs_bmbt_irec;
66 struct xfs_bmap_free;
67 struct xfs_extdelta;
68 struct xfs_swapext;
69 
70 extern struct bhv_vfsops xfs_vfsops;
71 extern struct bhv_vnodeops xfs_vnodeops;
72 
73 #define	AIL_LOCK_T		lock_t
74 #define	AIL_LOCKINIT(x,y)	spinlock_init(x,y)
75 #define	AIL_LOCK_DESTROY(x)	spinlock_destroy(x)
76 #define	AIL_LOCK(mp,s)		s=mutex_spinlock(&(mp)->m_ail_lock)
77 #define	AIL_UNLOCK(mp,s)	mutex_spinunlock(&(mp)->m_ail_lock, s)
78 
79 
80 /*
81  * Prototypes and functions for the Data Migration subsystem.
82  */
83 
84 typedef int	(*xfs_send_data_t)(int, struct bhv_vnode *,
85 			xfs_off_t, size_t, int, bhv_vrwlock_t *);
86 typedef int	(*xfs_send_mmap_t)(struct vm_area_struct *, uint);
87 typedef int	(*xfs_send_destroy_t)(struct bhv_vnode *, dm_right_t);
88 typedef int	(*xfs_send_namesp_t)(dm_eventtype_t, struct bhv_vfs *,
89 			struct bhv_vnode *,
90 			dm_right_t, struct bhv_vnode *, dm_right_t,
91 			char *, char *, mode_t, int, int);
92 typedef void	(*xfs_send_unmount_t)(struct bhv_vfs *, struct bhv_vnode *,
93 			dm_right_t, mode_t, int, int);
94 
95 typedef struct xfs_dmops {
96 	xfs_send_data_t		xfs_send_data;
97 	xfs_send_mmap_t		xfs_send_mmap;
98 	xfs_send_destroy_t	xfs_send_destroy;
99 	xfs_send_namesp_t	xfs_send_namesp;
100 	xfs_send_unmount_t	xfs_send_unmount;
101 } xfs_dmops_t;
102 
103 #define XFS_SEND_DATA(mp, ev,vp,off,len,fl,lock) \
104 	(*(mp)->m_dm_ops.xfs_send_data)(ev,vp,off,len,fl,lock)
105 #define XFS_SEND_MMAP(mp, vma,fl) \
106 	(*(mp)->m_dm_ops.xfs_send_mmap)(vma,fl)
107 #define XFS_SEND_DESTROY(mp, vp,right) \
108 	(*(mp)->m_dm_ops.xfs_send_destroy)(vp,right)
109 #define XFS_SEND_NAMESP(mp, ev,b1,r1,b2,r2,n1,n2,mode,rval,fl) \
110 	(*(mp)->m_dm_ops.xfs_send_namesp)(ev,NULL,b1,r1,b2,r2,n1,n2,mode,rval,fl)
111 #define XFS_SEND_PREUNMOUNT(mp, vfs,b1,r1,b2,r2,n1,n2,mode,rval,fl) \
112 	(*(mp)->m_dm_ops.xfs_send_namesp)(DM_EVENT_PREUNMOUNT,vfs,b1,r1,b2,r2,n1,n2,mode,rval,fl)
113 #define XFS_SEND_UNMOUNT(mp, vfsp,vp,right,mode,rval,fl) \
114 	(*(mp)->m_dm_ops.xfs_send_unmount)(vfsp,vp,right,mode,rval,fl)
115 
116 
117 /*
118  * Prototypes and functions for the Quota Management subsystem.
119  */
120 
121 struct xfs_dquot;
122 struct xfs_dqtrxops;
123 struct xfs_quotainfo;
124 
125 typedef int	(*xfs_qminit_t)(struct xfs_mount *, uint *, uint *);
126 typedef int	(*xfs_qmmount_t)(struct xfs_mount *, uint, uint, int);
127 typedef int	(*xfs_qmunmount_t)(struct xfs_mount *);
128 typedef void	(*xfs_qmdone_t)(struct xfs_mount *);
129 typedef void	(*xfs_dqrele_t)(struct xfs_dquot *);
130 typedef int	(*xfs_dqattach_t)(struct xfs_inode *, uint);
131 typedef void	(*xfs_dqdetach_t)(struct xfs_inode *);
132 typedef int	(*xfs_dqpurgeall_t)(struct xfs_mount *, uint);
133 typedef int	(*xfs_dqvopalloc_t)(struct xfs_mount *,
134 			struct xfs_inode *, uid_t, gid_t, prid_t, uint,
135 			struct xfs_dquot **, struct xfs_dquot **);
136 typedef void	(*xfs_dqvopcreate_t)(struct xfs_trans *, struct xfs_inode *,
137 			struct xfs_dquot *, struct xfs_dquot *);
138 typedef int	(*xfs_dqvoprename_t)(struct xfs_inode **);
139 typedef struct xfs_dquot * (*xfs_dqvopchown_t)(
140 			struct xfs_trans *, struct xfs_inode *,
141 			struct xfs_dquot **, struct xfs_dquot *);
142 typedef int	(*xfs_dqvopchownresv_t)(struct xfs_trans *, struct xfs_inode *,
143 			struct xfs_dquot *, struct xfs_dquot *, uint);
144 
145 typedef struct xfs_qmops {
146 	xfs_qminit_t		xfs_qminit;
147 	xfs_qmdone_t		xfs_qmdone;
148 	xfs_qmmount_t		xfs_qmmount;
149 	xfs_qmunmount_t		xfs_qmunmount;
150 	xfs_dqrele_t		xfs_dqrele;
151 	xfs_dqattach_t		xfs_dqattach;
152 	xfs_dqdetach_t		xfs_dqdetach;
153 	xfs_dqpurgeall_t	xfs_dqpurgeall;
154 	xfs_dqvopalloc_t	xfs_dqvopalloc;
155 	xfs_dqvopcreate_t	xfs_dqvopcreate;
156 	xfs_dqvoprename_t	xfs_dqvoprename;
157 	xfs_dqvopchown_t	xfs_dqvopchown;
158 	xfs_dqvopchownresv_t	xfs_dqvopchownresv;
159 	struct xfs_dqtrxops	*xfs_dqtrxops;
160 } xfs_qmops_t;
161 
162 #define XFS_QM_INIT(mp, mnt, fl) \
163 	(*(mp)->m_qm_ops.xfs_qminit)(mp, mnt, fl)
164 #define XFS_QM_MOUNT(mp, mnt, fl, mfsi_flags) \
165 	(*(mp)->m_qm_ops.xfs_qmmount)(mp, mnt, fl, mfsi_flags)
166 #define XFS_QM_UNMOUNT(mp) \
167 	(*(mp)->m_qm_ops.xfs_qmunmount)(mp)
168 #define XFS_QM_DONE(mp) \
169 	(*(mp)->m_qm_ops.xfs_qmdone)(mp)
170 #define XFS_QM_DQRELE(mp, dq) \
171 	(*(mp)->m_qm_ops.xfs_dqrele)(dq)
172 #define XFS_QM_DQATTACH(mp, ip, fl) \
173 	(*(mp)->m_qm_ops.xfs_dqattach)(ip, fl)
174 #define XFS_QM_DQDETACH(mp, ip) \
175 	(*(mp)->m_qm_ops.xfs_dqdetach)(ip)
176 #define XFS_QM_DQPURGEALL(mp, fl) \
177 	(*(mp)->m_qm_ops.xfs_dqpurgeall)(mp, fl)
178 #define XFS_QM_DQVOPALLOC(mp, ip, uid, gid, prid, fl, dq1, dq2) \
179 	(*(mp)->m_qm_ops.xfs_dqvopalloc)(mp, ip, uid, gid, prid, fl, dq1, dq2)
180 #define XFS_QM_DQVOPCREATE(mp, tp, ip, dq1, dq2) \
181 	(*(mp)->m_qm_ops.xfs_dqvopcreate)(tp, ip, dq1, dq2)
182 #define XFS_QM_DQVOPRENAME(mp, ip) \
183 	(*(mp)->m_qm_ops.xfs_dqvoprename)(ip)
184 #define XFS_QM_DQVOPCHOWN(mp, tp, ip, dqp, dq) \
185 	(*(mp)->m_qm_ops.xfs_dqvopchown)(tp, ip, dqp, dq)
186 #define XFS_QM_DQVOPCHOWNRESV(mp, tp, ip, dq1, dq2, fl) \
187 	(*(mp)->m_qm_ops.xfs_dqvopchownresv)(tp, ip, dq1, dq2, fl)
188 
189 
190 /*
191  * Prototypes and functions for I/O core modularization.
192  */
193 
194 typedef int		(*xfs_ioinit_t)(struct bhv_vfs *,
195 				struct xfs_mount_args *, int);
196 typedef int		(*xfs_bmapi_t)(struct xfs_trans *, void *,
197 				xfs_fileoff_t, xfs_filblks_t, int,
198 				xfs_fsblock_t *, xfs_extlen_t,
199 				struct xfs_bmbt_irec *, int *,
200 				struct xfs_bmap_free *, struct xfs_extdelta *);
201 typedef int		(*xfs_bunmapi_t)(struct xfs_trans *,
202 				void *, xfs_fileoff_t,
203 				xfs_filblks_t, int, xfs_extnum_t,
204 				xfs_fsblock_t *, struct xfs_bmap_free *,
205 				struct xfs_extdelta *, int *);
206 typedef int		(*xfs_bmap_eof_t)(void *, xfs_fileoff_t, int, int *);
207 typedef int		(*xfs_iomap_write_direct_t)(
208 				void *, xfs_off_t, size_t, int,
209 				struct xfs_bmbt_irec *, int *, int);
210 typedef int		(*xfs_iomap_write_delay_t)(
211 				void *, xfs_off_t, size_t, int,
212 				struct xfs_bmbt_irec *, int *);
213 typedef int		(*xfs_iomap_write_allocate_t)(
214 				void *, xfs_off_t, size_t,
215 				struct xfs_bmbt_irec *, int *);
216 typedef int		(*xfs_iomap_write_unwritten_t)(
217 				void *, xfs_off_t, size_t);
218 typedef uint		(*xfs_lck_map_shared_t)(void *);
219 typedef void		(*xfs_lock_t)(void *, uint);
220 typedef void		(*xfs_lock_demote_t)(void *, uint);
221 typedef int		(*xfs_lock_nowait_t)(void *, uint);
222 typedef void		(*xfs_unlk_t)(void *, unsigned int);
223 typedef xfs_fsize_t	(*xfs_size_t)(void *);
224 typedef xfs_fsize_t	(*xfs_iodone_t)(struct bhv_vfs *);
225 typedef int		(*xfs_swap_extents_t)(void *, void *,
226 				struct xfs_swapext*);
227 
228 typedef struct xfs_ioops {
229 	xfs_ioinit_t			xfs_ioinit;
230 	xfs_bmapi_t			xfs_bmapi_func;
231 	xfs_bunmapi_t			xfs_bunmapi_func;
232 	xfs_bmap_eof_t			xfs_bmap_eof_func;
233 	xfs_iomap_write_direct_t	xfs_iomap_write_direct;
234 	xfs_iomap_write_delay_t		xfs_iomap_write_delay;
235 	xfs_iomap_write_allocate_t	xfs_iomap_write_allocate;
236 	xfs_iomap_write_unwritten_t	xfs_iomap_write_unwritten;
237 	xfs_lock_t			xfs_ilock;
238 	xfs_lck_map_shared_t		xfs_lck_map_shared;
239 	xfs_lock_demote_t		xfs_ilock_demote;
240 	xfs_lock_nowait_t		xfs_ilock_nowait;
241 	xfs_unlk_t			xfs_unlock;
242 	xfs_size_t			xfs_size_func;
243 	xfs_iodone_t			xfs_iodone;
244 	xfs_swap_extents_t		xfs_swap_extents_func;
245 } xfs_ioops_t;
246 
247 #define XFS_IOINIT(vfsp, args, flags) \
248 	(*(mp)->m_io_ops.xfs_ioinit)(vfsp, args, flags)
249 #define XFS_BMAPI(mp, trans,io,bno,len,f,first,tot,mval,nmap,flist,delta) \
250 	(*(mp)->m_io_ops.xfs_bmapi_func) \
251 		(trans,(io)->io_obj,bno,len,f,first,tot,mval,nmap,flist,delta)
252 #define XFS_BUNMAPI(mp, trans,io,bno,len,f,nexts,first,flist,delta,done) \
253 	(*(mp)->m_io_ops.xfs_bunmapi_func) \
254 		(trans,(io)->io_obj,bno,len,f,nexts,first,flist,delta,done)
255 #define XFS_BMAP_EOF(mp, io, endoff, whichfork, eof) \
256 	(*(mp)->m_io_ops.xfs_bmap_eof_func) \
257 		((io)->io_obj, endoff, whichfork, eof)
258 #define XFS_IOMAP_WRITE_DIRECT(mp, io, offset, count, flags, mval, nmap, found)\
259 	(*(mp)->m_io_ops.xfs_iomap_write_direct) \
260 		((io)->io_obj, offset, count, flags, mval, nmap, found)
261 #define XFS_IOMAP_WRITE_DELAY(mp, io, offset, count, flags, mval, nmap) \
262 	(*(mp)->m_io_ops.xfs_iomap_write_delay) \
263 		((io)->io_obj, offset, count, flags, mval, nmap)
264 #define XFS_IOMAP_WRITE_ALLOCATE(mp, io, offset, count, mval, nmap) \
265 	(*(mp)->m_io_ops.xfs_iomap_write_allocate) \
266 		((io)->io_obj, offset, count, mval, nmap)
267 #define XFS_IOMAP_WRITE_UNWRITTEN(mp, io, offset, count) \
268 	(*(mp)->m_io_ops.xfs_iomap_write_unwritten) \
269 		((io)->io_obj, offset, count)
270 #define XFS_LCK_MAP_SHARED(mp, io) \
271 	(*(mp)->m_io_ops.xfs_lck_map_shared)((io)->io_obj)
272 #define XFS_ILOCK(mp, io, mode) \
273 	(*(mp)->m_io_ops.xfs_ilock)((io)->io_obj, mode)
274 #define XFS_ILOCK_NOWAIT(mp, io, mode) \
275 	(*(mp)->m_io_ops.xfs_ilock_nowait)((io)->io_obj, mode)
276 #define XFS_IUNLOCK(mp, io, mode) \
277 	(*(mp)->m_io_ops.xfs_unlock)((io)->io_obj, mode)
278 #define XFS_ILOCK_DEMOTE(mp, io, mode) \
279 	(*(mp)->m_io_ops.xfs_ilock_demote)((io)->io_obj, mode)
280 #define XFS_SIZE(mp, io) \
281 	(*(mp)->m_io_ops.xfs_size_func)((io)->io_obj)
282 #define XFS_IODONE(vfsp) \
283 	(*(mp)->m_io_ops.xfs_iodone)(vfsp)
284 #define XFS_SWAP_EXTENTS(mp, io, tio, sxp) \
285 	(*(mp)->m_io_ops.xfs_swap_extents_func) \
286 		((io)->io_obj, (tio)->io_obj, sxp)
287 
288 #ifdef HAVE_PERCPU_SB
289 
290 /*
291  * Valid per-cpu incore superblock counters. Note that if you add new counters,
292  * you may need to define new counter disabled bit field descriptors as there
293  * are more possible fields in the superblock that can fit in a bitfield on a
294  * 32 bit platform. The XFS_SBS_* values for the current current counters just
295  * fit.
296  */
297 typedef struct xfs_icsb_cnts {
298 	uint64_t	icsb_fdblocks;
299 	uint64_t	icsb_ifree;
300 	uint64_t	icsb_icount;
301 	unsigned long	icsb_flags;
302 } xfs_icsb_cnts_t;
303 
304 #define XFS_ICSB_FLAG_LOCK	(1 << 0)	/* counter lock bit */
305 
306 #define XFS_ICSB_SB_LOCKED	(1 << 0)	/* sb already locked */
307 #define XFS_ICSB_LAZY_COUNT	(1 << 1)	/* accuracy not needed */
308 
309 extern int	xfs_icsb_init_counters(struct xfs_mount *);
310 extern void	xfs_icsb_reinit_counters(struct xfs_mount *);
311 extern void	xfs_icsb_sync_counters_flags(struct xfs_mount *, int);
312 
313 #else
314 #define xfs_icsb_init_counters(mp)	(0)
315 #define xfs_icsb_reinit_counters(mp)	do { } while (0)
316 #define xfs_icsb_sync_counters_flags(mp, flags)	do { } while (0)
317 #endif
318 
319 typedef struct xfs_mount {
320 	bhv_desc_t		m_bhv;		/* vfs xfs behavior */
321 	xfs_tid_t		m_tid;		/* next unused tid for fs */
322 	AIL_LOCK_T		m_ail_lock;	/* fs AIL mutex */
323 	xfs_ail_entry_t		m_ail;		/* fs active log item list */
324 	uint			m_ail_gen;	/* fs AIL generation count */
325 	xfs_sb_t		m_sb;		/* copy of fs superblock */
326 	lock_t			m_sb_lock;	/* sb counter mutex */
327 	struct xfs_buf		*m_sb_bp;	/* buffer for superblock */
328 	char			*m_fsname;	/* filesystem name */
329 	int			m_fsname_len;	/* strlen of fs name */
330 	char			*m_rtname;	/* realtime device name */
331 	char			*m_logname;	/* external log device name */
332 	int			m_bsize;	/* fs logical block size */
333 	xfs_agnumber_t		m_agfrotor;	/* last ag where space found */
334 	xfs_agnumber_t		m_agirotor;	/* last ag dir inode alloced */
335 	lock_t			m_agirotor_lock;/* .. and lock protecting it */
336 	xfs_agnumber_t		m_maxagi;	/* highest inode alloc group */
337 	size_t			m_ihsize;	/* size of next field */
338 	struct xfs_ihash	*m_ihash;	/* fs private inode hash table*/
339 	struct xfs_inode	*m_inodes;	/* active inode list */
340 	struct list_head	m_del_inodes;	/* inodes to reclaim */
341 	mutex_t			m_ilock;	/* inode list mutex */
342 	uint			m_ireclaims;	/* count of calls to reclaim*/
343 	uint			m_readio_log;	/* min read size log bytes */
344 	uint			m_readio_blocks; /* min read size blocks */
345 	uint			m_writeio_log;	/* min write size log bytes */
346 	uint			m_writeio_blocks; /* min write size blocks */
347 	struct log		*m_log;		/* log specific stuff */
348 	int			m_logbufs;	/* number of log buffers */
349 	int			m_logbsize;	/* size of each log buffer */
350 	uint			m_rsumlevels;	/* rt summary levels */
351 	uint			m_rsumsize;	/* size of rt summary, bytes */
352 	struct xfs_inode	*m_rbmip;	/* pointer to bitmap inode */
353 	struct xfs_inode	*m_rsumip;	/* pointer to summary inode */
354 	struct xfs_inode	*m_rootip;	/* pointer to root directory */
355 	struct xfs_quotainfo	*m_quotainfo;	/* disk quota information */
356 	xfs_buftarg_t		*m_ddev_targp;	/* saves taking the address */
357 	xfs_buftarg_t		*m_logdev_targp;/* ptr to log device */
358 	xfs_buftarg_t		*m_rtdev_targp;	/* ptr to rt device */
359 	__uint8_t		m_dircook_elog;	/* log d-cookie entry bits */
360 	__uint8_t		m_blkbit_log;	/* blocklog + NBBY */
361 	__uint8_t		m_blkbb_log;	/* blocklog - BBSHIFT */
362 	__uint8_t		m_agno_log;	/* log #ag's */
363 	__uint8_t		m_agino_log;	/* #bits for agino in inum */
364 	__uint8_t		m_nreadaheads;	/* #readahead buffers */
365 	__uint16_t		m_inode_cluster_size;/* min inode buf size */
366 	uint			m_blockmask;	/* sb_blocksize-1 */
367 	uint			m_blockwsize;	/* sb_blocksize in words */
368 	uint			m_blockwmask;	/* blockwsize-1 */
369 	uint			m_alloc_mxr[2];	/* XFS_ALLOC_BLOCK_MAXRECS */
370 	uint			m_alloc_mnr[2];	/* XFS_ALLOC_BLOCK_MINRECS */
371 	uint			m_bmap_dmxr[2];	/* XFS_BMAP_BLOCK_DMAXRECS */
372 	uint			m_bmap_dmnr[2];	/* XFS_BMAP_BLOCK_DMINRECS */
373 	uint			m_inobt_mxr[2];	/* XFS_INOBT_BLOCK_MAXRECS */
374 	uint			m_inobt_mnr[2];	/* XFS_INOBT_BLOCK_MINRECS */
375 	uint			m_ag_maxlevels;	/* XFS_AG_MAXLEVELS */
376 	uint			m_bm_maxlevels[2]; /* XFS_BM_MAXLEVELS */
377 	uint			m_in_maxlevels;	/* XFS_IN_MAXLEVELS */
378 	struct xfs_perag	*m_perag;	/* per-ag accounting info */
379 	struct rw_semaphore	m_peraglock;	/* lock for m_perag (pointer) */
380 	sema_t			m_growlock;	/* growfs mutex */
381 	int			m_fixedfsid[2];	/* unchanged for life of FS */
382 	uint			m_dmevmask;	/* DMI events for this FS */
383 	__uint64_t		m_flags;	/* global mount flags */
384 	uint			m_attroffset;	/* inode attribute offset */
385 	uint			m_dir_node_ents; /* #entries in a dir danode */
386 	uint			m_attr_node_ents; /* #entries in attr danode */
387 	int			m_ialloc_inos;	/* inodes in inode allocation */
388 	int			m_ialloc_blks;	/* blocks in inode allocation */
389 	int			m_litino;	/* size of inode union area */
390 	int			m_inoalign_mask;/* mask sb_inoalignmt if used */
391 	uint			m_qflags;	/* quota status flags */
392 	xfs_trans_reservations_t m_reservations;/* precomputed res values */
393 	__uint64_t		m_maxicount;	/* maximum inode count */
394 	__uint64_t		m_maxioffset;	/* maximum inode offset */
395 	__uint64_t		m_resblks;	/* total reserved blocks */
396 	__uint64_t		m_resblks_avail;/* available reserved blocks */
397 #if XFS_BIG_INUMS
398 	xfs_ino_t		m_inoadd;	/* add value for ino64_offset */
399 #endif
400 	int			m_dalign;	/* stripe unit */
401 	int			m_swidth;	/* stripe width */
402 	int			m_sinoalign;	/* stripe unit inode alignment */
403 	int			m_attr_magicpct;/* 37% of the blocksize */
404 	int			m_dir_magicpct;	/* 37% of the dir blocksize */
405 	__uint8_t		m_mk_sharedro;	/* mark shared ro on unmount */
406 	__uint8_t		m_inode_quiesce;/* call quiesce on new inodes.
407 						   field governed by m_ilock */
408 	__uint8_t		m_sectbb_log;	/* sectlog - BBSHIFT */
409 	int			m_dirblksize;	/* directory block sz--bytes */
410 	int			m_dirblkfsbs;	/* directory block sz--fsbs */
411 	xfs_dablk_t		m_dirdatablk;	/* blockno of dir data v2 */
412 	xfs_dablk_t		m_dirleafblk;	/* blockno of dir non-data v2 */
413 	xfs_dablk_t		m_dirfreeblk;	/* blockno of dirfreeindex v2 */
414 	uint			m_chsize;	/* size of next field */
415 	struct xfs_chash	*m_chash;	/* fs private inode per-cluster
416 						 * hash table */
417 	struct xfs_dmops	m_dm_ops;	/* vector of DMI ops */
418 	struct xfs_qmops	m_qm_ops;	/* vector of XQM ops */
419 	struct xfs_ioops	m_io_ops;	/* vector of I/O ops */
420 	atomic_t		m_active_trans;	/* number trans frozen */
421 #ifdef HAVE_PERCPU_SB
422 	xfs_icsb_cnts_t		*m_sb_cnts;	/* per-cpu superblock counters */
423 	unsigned long		m_icsb_counters; /* disabled per-cpu counters */
424 	struct notifier_block	m_icsb_notifier; /* hotplug cpu notifier */
425 	struct mutex		m_icsb_mutex;	/* balancer sync lock */
426 #endif
427 } xfs_mount_t;
428 
429 /*
430  * Flags for m_flags.
431  */
432 #define	XFS_MOUNT_WSYNC		(1ULL << 0)	/* for nfs - all metadata ops
433 						   must be synchronous except
434 						   for space allocations */
435 #define	XFS_MOUNT_INO64		(1ULL << 1)
436 			     /* (1ULL << 2)	-- currently unused */
437 			     /* (1ULL << 3)	-- currently unused */
438 #define XFS_MOUNT_FS_SHUTDOWN	(1ULL << 4)	/* atomic stop of all filesystem
439 						   operations, typically for
440 						   disk errors in metadata */
441 #define XFS_MOUNT_RETERR	(1ULL << 6)     /* return alignment errors to
442 						   user */
443 #define XFS_MOUNT_NOALIGN	(1ULL << 7)	/* turn off stripe alignment
444 						   allocations */
445 #define XFS_MOUNT_ATTR2		(1ULL << 8)	/* allow use of attr2 format */
446 			     /*	(1ULL << 9)	-- currently unused */
447 #define XFS_MOUNT_NORECOVERY	(1ULL << 10)	/* no recovery - dirty fs */
448 #define XFS_MOUNT_SHARED	(1ULL << 11)	/* shared mount */
449 #define XFS_MOUNT_DFLT_IOSIZE	(1ULL << 12)	/* set default i/o size */
450 #define XFS_MOUNT_OSYNCISOSYNC	(1ULL << 13)	/* o_sync is REALLY o_sync */
451 						/* osyncisdsync is now default*/
452 #define XFS_MOUNT_32BITINODES	(1ULL << 14)	/* do not create inodes above
453 						 * 32 bits in size */
454 			     /* (1ULL << 15)	-- currently unused */
455 #define XFS_MOUNT_NOUUID	(1ULL << 16)	/* ignore uuid during mount */
456 #define XFS_MOUNT_BARRIER	(1ULL << 17)
457 #define XFS_MOUNT_IDELETE	(1ULL << 18)	/* delete empty inode clusters*/
458 #define XFS_MOUNT_SWALLOC	(1ULL << 19)	/* turn on stripe width
459 						 * allocation */
460 #define XFS_MOUNT_IHASHSIZE	(1ULL << 20)	/* inode hash table size */
461 #define XFS_MOUNT_DIRSYNC	(1ULL << 21)	/* synchronous directory ops */
462 #define XFS_MOUNT_COMPAT_IOSIZE	(1ULL << 22)	/* don't report large preferred
463 						 * I/O size in stat() */
464 #define XFS_MOUNT_NO_PERCPU_SB	(1ULL << 23)	/* don't use per-cpu superblock
465 						   counters */
466 
467 
468 /*
469  * Default minimum read and write sizes.
470  */
471 #define XFS_READIO_LOG_LARGE	16
472 #define XFS_WRITEIO_LOG_LARGE	16
473 
474 /*
475  * Max and min values for mount-option defined I/O
476  * preallocation sizes.
477  */
478 #define XFS_MAX_IO_LOG		30	/* 1G */
479 #define XFS_MIN_IO_LOG		PAGE_SHIFT
480 
481 /*
482  * Synchronous read and write sizes.  This should be
483  * better for NFSv2 wsync filesystems.
484  */
485 #define	XFS_WSYNC_READIO_LOG	15	/* 32K */
486 #define	XFS_WSYNC_WRITEIO_LOG	14	/* 16K */
487 
488 /*
489  * Allow large block sizes to be reported to userspace programs if the
490  * "largeio" mount option is used.
491  *
492  * If compatibility mode is specified, simply return the basic unit of caching
493  * so that we don't get inefficient read/modify/write I/O from user apps.
494  * Otherwise....
495  *
496  * If the underlying volume is a stripe, then return the stripe width in bytes
497  * as the recommended I/O size. It is not a stripe and we've set a default
498  * buffered I/O size, return that, otherwise return the compat default.
499  */
500 static inline unsigned long
501 xfs_preferred_iosize(xfs_mount_t *mp)
502 {
503 	if (mp->m_flags & XFS_MOUNT_COMPAT_IOSIZE)
504 		return PAGE_CACHE_SIZE;
505 	return (mp->m_swidth ?
506 		(mp->m_swidth << mp->m_sb.sb_blocklog) :
507 		((mp->m_flags & XFS_MOUNT_DFLT_IOSIZE) ?
508 			(1 << (int)MAX(mp->m_readio_log, mp->m_writeio_log)) :
509 			PAGE_CACHE_SIZE));
510 }
511 
512 #define XFS_MAXIOFFSET(mp)	((mp)->m_maxioffset)
513 
514 #define XFS_FORCED_SHUTDOWN(mp)	((mp)->m_flags & XFS_MOUNT_FS_SHUTDOWN)
515 #define xfs_force_shutdown(m,f)	\
516 	bhv_vfs_force_shutdown((XFS_MTOVFS(m)), f, __FILE__, __LINE__)
517 
518 /*
519  * Flags for xfs_mountfs
520  */
521 #define XFS_MFSI_SECOND		0x01	/* Secondary mount -- skip stuff */
522 #define XFS_MFSI_CLIENT		0x02	/* Is a client -- skip lots of stuff */
523 /*	XFS_MFSI_RRINODES	*/
524 #define XFS_MFSI_NOUNLINK	0x08	/* Skip unlinked inode processing in */
525 					/* log recovery */
526 #define XFS_MFSI_NO_QUOTACHECK	0x10	/* Skip quotacheck processing */
527 /*	XFS_MFSI_CONVERT_SUNIT	*/
528 #define XFS_MFSI_QUIET		0x40	/* Be silent if mount errors found */
529 
530 /*
531  * Macros for getting from mount to vfs and back.
532  */
533 #define	XFS_MTOVFS(mp)		xfs_mtovfs(mp)
534 static inline struct bhv_vfs *xfs_mtovfs(xfs_mount_t *mp)
535 {
536 	return bhvtovfs(&mp->m_bhv);
537 }
538 
539 #define	XFS_BHVTOM(bdp)	xfs_bhvtom(bdp)
540 static inline xfs_mount_t *xfs_bhvtom(bhv_desc_t *bdp)
541 {
542 	return (xfs_mount_t *)BHV_PDATA(bdp);
543 }
544 
545 #define XFS_VFSTOM(vfs) xfs_vfstom(vfs)
546 static inline xfs_mount_t *xfs_vfstom(bhv_vfs_t *vfs)
547 {
548 	return XFS_BHVTOM(bhv_lookup_range(VFS_BHVHEAD(vfs),
549 				VFS_POSITION_XFS, VFS_POSITION_XFS));
550 }
551 
552 #define XFS_DADDR_TO_AGNO(mp,d)         xfs_daddr_to_agno(mp,d)
553 static inline xfs_agnumber_t
554 xfs_daddr_to_agno(struct xfs_mount *mp, xfs_daddr_t d)
555 {
556 	xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
557 	do_div(ld, mp->m_sb.sb_agblocks);
558 	return (xfs_agnumber_t) ld;
559 }
560 
561 #define XFS_DADDR_TO_AGBNO(mp,d)        xfs_daddr_to_agbno(mp,d)
562 static inline xfs_agblock_t
563 xfs_daddr_to_agbno(struct xfs_mount *mp, xfs_daddr_t d)
564 {
565 	xfs_daddr_t ld = XFS_BB_TO_FSBT(mp, d);
566 	return (xfs_agblock_t) do_div(ld, mp->m_sb.sb_agblocks);
567 }
568 
569 /*
570  * Per-cpu superblock locking functions
571  */
572 #ifdef HAVE_PERCPU_SB
573 STATIC_INLINE void
574 xfs_icsb_lock(xfs_mount_t *mp)
575 {
576 	mutex_lock(&mp->m_icsb_mutex);
577 }
578 
579 STATIC_INLINE void
580 xfs_icsb_unlock(xfs_mount_t *mp)
581 {
582 	mutex_unlock(&mp->m_icsb_mutex);
583 }
584 #else
585 #define xfs_icsb_lock(mp)
586 #define xfs_icsb_unlock(mp)
587 #endif
588 
589 /*
590  * This structure is for use by the xfs_mod_incore_sb_batch() routine.
591  * xfs_growfs can specify a few fields which are more than int limit
592  */
593 typedef struct xfs_mod_sb {
594 	xfs_sb_field_t	msb_field;	/* Field to modify, see below */
595 	int64_t		msb_delta;	/* Change to make to specified field */
596 } xfs_mod_sb_t;
597 
598 #define	XFS_MOUNT_ILOCK(mp)	mutex_lock(&((mp)->m_ilock))
599 #define	XFS_MOUNT_IUNLOCK(mp)	mutex_unlock(&((mp)->m_ilock))
600 #define	XFS_SB_LOCK(mp)		mutex_spinlock(&(mp)->m_sb_lock)
601 #define	XFS_SB_UNLOCK(mp,s)	mutex_spinunlock(&(mp)->m_sb_lock,(s))
602 
603 extern xfs_mount_t *xfs_mount_init(void);
604 extern void	xfs_mod_sb(xfs_trans_t *, __int64_t);
605 extern void	xfs_mount_free(xfs_mount_t *mp, int remove_bhv);
606 extern int	xfs_mountfs(struct bhv_vfs *, xfs_mount_t *mp, int);
607 extern void	xfs_mountfs_check_barriers(xfs_mount_t *mp);
608 
609 extern int	xfs_unmountfs(xfs_mount_t *, struct cred *);
610 extern void	xfs_unmountfs_close(xfs_mount_t *, struct cred *);
611 extern int	xfs_unmountfs_writesb(xfs_mount_t *);
612 extern int	xfs_unmount_flush(xfs_mount_t *, int);
613 extern int	xfs_mod_incore_sb(xfs_mount_t *, xfs_sb_field_t, int64_t, int);
614 extern int	xfs_mod_incore_sb_unlocked(xfs_mount_t *, xfs_sb_field_t,
615 			int64_t, int);
616 extern int	xfs_mod_incore_sb_batch(xfs_mount_t *, xfs_mod_sb_t *,
617 			uint, int);
618 extern struct xfs_buf *xfs_getsb(xfs_mount_t *, int);
619 extern int	xfs_readsb(xfs_mount_t *, int);
620 extern void	xfs_freesb(xfs_mount_t *);
621 extern void	xfs_do_force_shutdown(bhv_desc_t *, int, char *, int);
622 extern int	xfs_syncsub(xfs_mount_t *, int, int *);
623 extern int	xfs_sync_inodes(xfs_mount_t *, int, int *);
624 extern xfs_agnumber_t	xfs_initialize_perag(struct bhv_vfs *, xfs_mount_t *,
625 						xfs_agnumber_t);
626 extern void	xfs_xlatesb(void *, struct xfs_sb *, int, __int64_t);
627 
628 extern struct xfs_dmops xfs_dmcore_stub;
629 extern struct xfs_qmops xfs_qmcore_stub;
630 extern struct xfs_ioops xfs_iocore_xfs;
631 
632 extern int	xfs_init(void);
633 extern void	xfs_cleanup(void);
634 
635 #endif	/* __KERNEL__ */
636 
637 #endif	/* __XFS_MOUNT_H__ */
638