1 /* 2 * Copyright (c) 2000-2003 Silicon Graphics, Inc. All Rights Reserved. 3 * 4 * This program is free software; you can redistribute it and/or modify it 5 * under the terms of version 2 of the GNU General Public License as 6 * published by the Free Software Foundation. 7 * 8 * This program is distributed in the hope that it would be useful, but 9 * WITHOUT ANY WARRANTY; without even the implied warranty of 10 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. 11 * 12 * Further, this software is distributed without any warranty that it is 13 * free of the rightful claim of any third person regarding infringement 14 * or the like. Any license provided herein, whether implied or 15 * otherwise, applies only to this software file. Patent licenses, if 16 * any, provided herein do not apply to combinations of this program with 17 * other software, or any other product whatsoever. 18 * 19 * You should have received a copy of the GNU General Public License along 20 * with this program; if not, write the Free Software Foundation, Inc., 59 21 * Temple Place - Suite 330, Boston MA 02111-1307, USA. 22 * 23 * Contact information: Silicon Graphics, Inc., 1600 Amphitheatre Pkwy, 24 * Mountain View, CA 94043, or: 25 * 26 * http://www.sgi.com 27 * 28 * For further information regarding this notice, see: 29 * 30 * http://oss.sgi.com/projects/GenInfo/SGIGPLNoticeExplan/ 31 */ 32 #ifndef __XFS_VFS_H__ 33 #define __XFS_VFS_H__ 34 35 #include <linux/vfs.h> 36 #include "xfs_fs.h" 37 38 struct fid; 39 struct vfs; 40 struct cred; 41 struct vnode; 42 struct statfs; 43 struct seq_file; 44 struct super_block; 45 struct xfs_mount_args; 46 47 typedef struct statfs xfs_statfs_t; 48 49 typedef struct vfs_sync_work { 50 struct list_head w_list; 51 struct vfs *w_vfs; 52 void *w_data; /* syncer routine argument */ 53 void (*w_syncer)(struct vfs *, void *); 54 } vfs_sync_work_t; 55 56 typedef struct vfs { 57 u_int vfs_flag; /* flags */ 58 xfs_fsid_t vfs_fsid; /* file system ID */ 59 xfs_fsid_t *vfs_altfsid; /* An ID fixed for life of FS */ 60 bhv_head_t vfs_bh; /* head of vfs behavior chain */ 61 struct super_block *vfs_super; /* generic superblock pointer */ 62 struct task_struct *vfs_sync_task; /* generalised sync thread */ 63 vfs_sync_work_t vfs_sync_work; /* work item for VFS_SYNC */ 64 struct list_head vfs_sync_list; /* sync thread work item list */ 65 spinlock_t vfs_sync_lock; /* work item list lock */ 66 wait_queue_head_t vfs_wait_sync_task; 67 int vfs_frozen; 68 wait_queue_head_t vfs_wait_unfrozen; 69 } vfs_t; 70 71 #define vfs_fbhv vfs_bh.bh_first /* 1st on vfs behavior chain */ 72 73 #define bhvtovfs(bdp) ( (struct vfs *)BHV_VOBJ(bdp) ) 74 #define bhvtovfsops(bdp) ( (struct vfsops *)BHV_OPS(bdp) ) 75 #define VFS_BHVHEAD(vfs) ( &(vfs)->vfs_bh ) 76 #define VFS_REMOVEBHV(vfs, bdp) ( bhv_remove(VFS_BHVHEAD(vfs), bdp) ) 77 78 #define VFS_POSITION_BASE BHV_POSITION_BASE /* chain bottom */ 79 #define VFS_POSITION_TOP BHV_POSITION_TOP /* chain top */ 80 #define VFS_POSITION_INVALID BHV_POSITION_INVALID /* invalid pos. num */ 81 82 typedef enum { 83 VFS_BHV_UNKNOWN, /* not specified */ 84 VFS_BHV_XFS, /* xfs */ 85 VFS_BHV_DM, /* data migration */ 86 VFS_BHV_QM, /* quota manager */ 87 VFS_BHV_IO, /* IO path */ 88 VFS_BHV_END /* housekeeping end-of-range */ 89 } vfs_bhv_t; 90 91 #define VFS_POSITION_XFS (BHV_POSITION_BASE) 92 #define VFS_POSITION_DM (VFS_POSITION_BASE+10) 93 #define VFS_POSITION_QM (VFS_POSITION_BASE+20) 94 #define VFS_POSITION_IO (VFS_POSITION_BASE+30) 95 96 #define VFS_RDONLY 0x0001 /* read-only vfs */ 97 #define VFS_GRPID 0x0002 /* group-ID assigned from directory */ 98 #define VFS_DMI 0x0004 /* filesystem has the DMI enabled */ 99 #define VFS_UMOUNT 0x0008 /* unmount in progress */ 100 #define VFS_END 0x0008 /* max flag */ 101 102 #define SYNC_ATTR 0x0001 /* sync attributes */ 103 #define SYNC_CLOSE 0x0002 /* close file system down */ 104 #define SYNC_DELWRI 0x0004 /* look at delayed writes */ 105 #define SYNC_WAIT 0x0008 /* wait for i/o to complete */ 106 #define SYNC_BDFLUSH 0x0010 /* BDFLUSH is calling -- don't block */ 107 #define SYNC_FSDATA 0x0020 /* flush fs data (e.g. superblocks) */ 108 #define SYNC_REFCACHE 0x0040 /* prune some of the nfs ref cache */ 109 #define SYNC_REMOUNT 0x0080 /* remount readonly, no dummy LRs */ 110 111 #define IGET_NOALLOC 0x0001 /* vfs_get_inode may return NULL */ 112 113 typedef int (*vfs_mount_t)(bhv_desc_t *, 114 struct xfs_mount_args *, struct cred *); 115 typedef int (*vfs_parseargs_t)(bhv_desc_t *, char *, 116 struct xfs_mount_args *, int); 117 typedef int (*vfs_showargs_t)(bhv_desc_t *, struct seq_file *); 118 typedef int (*vfs_unmount_t)(bhv_desc_t *, int, struct cred *); 119 typedef int (*vfs_mntupdate_t)(bhv_desc_t *, int *, 120 struct xfs_mount_args *); 121 typedef int (*vfs_root_t)(bhv_desc_t *, struct vnode **); 122 typedef int (*vfs_statvfs_t)(bhv_desc_t *, xfs_statfs_t *, struct vnode *); 123 typedef int (*vfs_sync_t)(bhv_desc_t *, int, struct cred *); 124 typedef int (*vfs_vget_t)(bhv_desc_t *, struct vnode **, struct fid *); 125 typedef int (*vfs_dmapiops_t)(bhv_desc_t *, caddr_t); 126 typedef int (*vfs_quotactl_t)(bhv_desc_t *, int, int, caddr_t); 127 typedef void (*vfs_init_vnode_t)(bhv_desc_t *, 128 struct vnode *, bhv_desc_t *, int); 129 typedef void (*vfs_force_shutdown_t)(bhv_desc_t *, int, char *, int); 130 typedef void (*vfs_freeze_t)(bhv_desc_t *); 131 typedef struct inode * (*vfs_get_inode_t)(bhv_desc_t *, xfs_ino_t, int); 132 133 typedef struct vfsops { 134 bhv_position_t vf_position; /* behavior chain position */ 135 vfs_mount_t vfs_mount; /* mount file system */ 136 vfs_parseargs_t vfs_parseargs; /* parse mount options */ 137 vfs_showargs_t vfs_showargs; /* unparse mount options */ 138 vfs_unmount_t vfs_unmount; /* unmount file system */ 139 vfs_mntupdate_t vfs_mntupdate; /* update file system options */ 140 vfs_root_t vfs_root; /* get root vnode */ 141 vfs_statvfs_t vfs_statvfs; /* file system statistics */ 142 vfs_sync_t vfs_sync; /* flush files */ 143 vfs_vget_t vfs_vget; /* get vnode from fid */ 144 vfs_dmapiops_t vfs_dmapiops; /* data migration */ 145 vfs_quotactl_t vfs_quotactl; /* disk quota */ 146 vfs_get_inode_t vfs_get_inode; /* bhv specific iget */ 147 vfs_init_vnode_t vfs_init_vnode; /* initialize a new vnode */ 148 vfs_force_shutdown_t vfs_force_shutdown; /* crash and burn */ 149 vfs_freeze_t vfs_freeze; /* freeze fs for snapshot */ 150 } vfsops_t; 151 152 /* 153 * VFS's. Operates on vfs structure pointers (starts at bhv head). 154 */ 155 #define VHEAD(v) ((v)->vfs_fbhv) 156 #define VFS_MOUNT(v, ma,cr, rv) ((rv) = vfs_mount(VHEAD(v), ma,cr)) 157 #define VFS_PARSEARGS(v, o,ma,f, rv) ((rv) = vfs_parseargs(VHEAD(v), o,ma,f)) 158 #define VFS_SHOWARGS(v, m, rv) ((rv) = vfs_showargs(VHEAD(v), m)) 159 #define VFS_UNMOUNT(v, f, cr, rv) ((rv) = vfs_unmount(VHEAD(v), f,cr)) 160 #define VFS_MNTUPDATE(v, fl, args, rv) ((rv) = vfs_mntupdate(VHEAD(v), fl, args)) 161 #define VFS_ROOT(v, vpp, rv) ((rv) = vfs_root(VHEAD(v), vpp)) 162 #define VFS_STATVFS(v, sp,vp, rv) ((rv) = vfs_statvfs(VHEAD(v), sp,vp)) 163 #define VFS_SYNC(v, flag,cr, rv) ((rv) = vfs_sync(VHEAD(v), flag,cr)) 164 #define VFS_VGET(v, vpp,fidp, rv) ((rv) = vfs_vget(VHEAD(v), vpp,fidp)) 165 #define VFS_DMAPIOPS(v, p, rv) ((rv) = vfs_dmapiops(VHEAD(v), p)) 166 #define VFS_QUOTACTL(v, c,id,p, rv) ((rv) = vfs_quotactl(VHEAD(v), c,id,p)) 167 #define VFS_GET_INODE(v, ino, fl) ( vfs_get_inode(VHEAD(v), ino,fl) ) 168 #define VFS_INIT_VNODE(v, vp,b,ul) ( vfs_init_vnode(VHEAD(v), vp,b,ul) ) 169 #define VFS_FORCE_SHUTDOWN(v, fl,f,l) ( vfs_force_shutdown(VHEAD(v), fl,f,l) ) 170 #define VFS_FREEZE(v) ( vfs_freeze(VHEAD(v)) ) 171 172 /* 173 * PVFS's. Operates on behavior descriptor pointers. 174 */ 175 #define PVFS_MOUNT(b, ma,cr, rv) ((rv) = vfs_mount(b, ma,cr)) 176 #define PVFS_PARSEARGS(b, o,ma,f, rv) ((rv) = vfs_parseargs(b, o,ma,f)) 177 #define PVFS_SHOWARGS(b, m, rv) ((rv) = vfs_showargs(b, m)) 178 #define PVFS_UNMOUNT(b, f,cr, rv) ((rv) = vfs_unmount(b, f,cr)) 179 #define PVFS_MNTUPDATE(b, fl, args, rv) ((rv) = vfs_mntupdate(b, fl, args)) 180 #define PVFS_ROOT(b, vpp, rv) ((rv) = vfs_root(b, vpp)) 181 #define PVFS_STATVFS(b, sp,vp, rv) ((rv) = vfs_statvfs(b, sp,vp)) 182 #define PVFS_SYNC(b, flag,cr, rv) ((rv) = vfs_sync(b, flag,cr)) 183 #define PVFS_VGET(b, vpp,fidp, rv) ((rv) = vfs_vget(b, vpp,fidp)) 184 #define PVFS_DMAPIOPS(b, p, rv) ((rv) = vfs_dmapiops(b, p)) 185 #define PVFS_QUOTACTL(b, c,id,p, rv) ((rv) = vfs_quotactl(b, c,id,p)) 186 #define PVFS_GET_INODE(b, ino,fl) ( vfs_get_inode(b, ino,fl) ) 187 #define PVFS_INIT_VNODE(b, vp,b2,ul) ( vfs_init_vnode(b, vp,b2,ul) ) 188 #define PVFS_FORCE_SHUTDOWN(b, fl,f,l) ( vfs_force_shutdown(b, fl,f,l) ) 189 #define PVFS_FREEZE(b) ( vfs_freeze(b) ) 190 191 extern int vfs_mount(bhv_desc_t *, struct xfs_mount_args *, struct cred *); 192 extern int vfs_parseargs(bhv_desc_t *, char *, struct xfs_mount_args *, int); 193 extern int vfs_showargs(bhv_desc_t *, struct seq_file *); 194 extern int vfs_unmount(bhv_desc_t *, int, struct cred *); 195 extern int vfs_mntupdate(bhv_desc_t *, int *, struct xfs_mount_args *); 196 extern int vfs_root(bhv_desc_t *, struct vnode **); 197 extern int vfs_statvfs(bhv_desc_t *, xfs_statfs_t *, struct vnode *); 198 extern int vfs_sync(bhv_desc_t *, int, struct cred *); 199 extern int vfs_vget(bhv_desc_t *, struct vnode **, struct fid *); 200 extern int vfs_dmapiops(bhv_desc_t *, caddr_t); 201 extern int vfs_quotactl(bhv_desc_t *, int, int, caddr_t); 202 extern struct inode *vfs_get_inode(bhv_desc_t *, xfs_ino_t, int); 203 extern void vfs_init_vnode(bhv_desc_t *, struct vnode *, bhv_desc_t *, int); 204 extern void vfs_force_shutdown(bhv_desc_t *, int, char *, int); 205 extern void vfs_freeze(bhv_desc_t *); 206 207 typedef struct bhv_vfsops { 208 struct vfsops bhv_common; 209 void * bhv_custom; 210 } bhv_vfsops_t; 211 212 #define vfs_bhv_lookup(v, id) ( bhv_lookup_range(&(v)->vfs_bh, (id), (id)) ) 213 #define vfs_bhv_custom(b) ( ((bhv_vfsops_t *)BHV_OPS(b))->bhv_custom ) 214 #define vfs_bhv_set_custom(b,o) ( (b)->bhv_custom = (void *)(o)) 215 #define vfs_bhv_clr_custom(b) ( (b)->bhv_custom = NULL ) 216 217 extern vfs_t *vfs_allocate(void); 218 extern void vfs_deallocate(vfs_t *); 219 extern void vfs_insertops(vfs_t *, bhv_vfsops_t *); 220 extern void vfs_insertbhv(vfs_t *, bhv_desc_t *, vfsops_t *, void *); 221 222 extern void bhv_insert_all_vfsops(struct vfs *); 223 extern void bhv_remove_all_vfsops(struct vfs *, int); 224 extern void bhv_remove_vfsops(struct vfs *, int); 225 226 enum { 227 SB_UNFROZEN = 0, 228 SB_FREEZE_WRITE = 1, 229 SB_FREEZE_TRANS = 2, 230 }; 231 232 #define fs_frozen(vfsp) ((vfsp)->vfs_frozen) 233 #define fs_check_frozen(vfsp, level) \ 234 wait_event((vfsp)->vfs_wait_unfrozen, ((vfsp)->vfs_frozen < (level))) 235 236 #endif /* __XFS_VFS_H__ */ 237