fs/xfs/linux-2.6/xfs_vfs.c

   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 #include "xfs.h"
  19 #include "xfs_fs.h"
  20 #include "xfs_inum.h"
  21 #include "xfs_log.h"
  22 #include "xfs_clnt.h"
  23 #include "xfs_trans.h"
  24 #include "xfs_sb.h"
  25 #include "xfs_ag.h"
  26 #include "xfs_dir.h"
  27 #include "xfs_dir2.h"
  28 #include "xfs_imap.h"
  29 #include "xfs_alloc.h"
  30 #include "xfs_dmapi.h"
  31 #include "xfs_mount.h"
  32 #include "xfs_quota.h"
  33
  34 int
  35 vfs_mount(
  36         struct bhv_desc         *bdp,
  37         struct xfs_mount_args   *args,
  38         struct cred             *cr)
  39 {
  40         struct bhv_desc         *next = bdp;
  41
  42         ASSERT(next);
  43         while (! (bhvtovfsops(next))->vfs_mount)
  44                 next = BHV_NEXT(next);
  45         return ((*bhvtovfsops(next)->vfs_mount)(next, args, cr));
  46 }
  47
  48 int
  49 vfs_parseargs(
  50         struct bhv_desc         *bdp,
  51         char                    *s,
  52         struct xfs_mount_args   *args,
  53         int                     f)
  54 {
  55         struct bhv_desc         *next = bdp;
  56
  57         ASSERT(next);
  58         while (! (bhvtovfsops(next))->vfs_parseargs)
  59                 next = BHV_NEXT(next);
  60         return ((*bhvtovfsops(next)->vfs_parseargs)(next, s, args, f));
  61 }
  62
  63 int
  64 vfs_showargs(
  65         struct bhv_desc         *bdp,
  66         struct seq_file         *m)
  67 {
  68         struct bhv_desc         *next = bdp;
  69
  70         ASSERT(next);
  71         while (! (bhvtovfsops(next))->vfs_showargs)
  72                 next = BHV_NEXT(next);
  73         return ((*bhvtovfsops(next)->vfs_showargs)(next, m));
  74 }
  75
  76 int
  77 vfs_unmount(
  78         struct bhv_desc         *bdp,
  79         int                     fl,
  80         struct cred             *cr)
  81 {
  82         struct bhv_desc         *next = bdp;
  83
  84         ASSERT(next);
  85         while (! (bhvtovfsops(next))->vfs_unmount)
  86                 next = BHV_NEXT(next);
  87         return ((*bhvtovfsops(next)->vfs_unmount)(next, fl, cr));
  88 }
  89
  90 int
  91 vfs_mntupdate(
  92         struct bhv_desc         *bdp,
  93         int                     *fl,
  94         struct xfs_mount_args   *args)
  95 {
  96         struct bhv_desc         *next = bdp;
  97
  98         ASSERT(next);
  99         while (! (bhvtovfsops(next))->vfs_mntupdate)
 100                 next = BHV_NEXT(next);
 101         return ((*bhvtovfsops(next)->vfs_mntupdate)(next, fl, args));
 102 }
 103
 104 int
 105 vfs_root(
 106         struct bhv_desc         *bdp,
 107         struct vnode            **vpp)
 108 {
 109         struct bhv_desc         *next = bdp;
 110
 111         ASSERT(next);
 112         while (! (bhvtovfsops(next))->vfs_root)
 113                 next = BHV_NEXT(next);
 114         return ((*bhvtovfsops(next)->vfs_root)(next, vpp));
 115 }
 116
 117 int
 118 vfs_statvfs(
 119         struct bhv_desc         *bdp,
 120         xfs_statfs_t            *sp,
 121         struct vnode            *vp)
 122 {
 123         struct bhv_desc         *next = bdp;
 124
 125         ASSERT(next);
 126         while (! (bhvtovfsops(next))->vfs_statvfs)
 127                 next = BHV_NEXT(next);
 128         return ((*bhvtovfsops(next)->vfs_statvfs)(next, sp, vp));
 129 }
 130
 131 int
 132 vfs_sync(
 133         struct bhv_desc         *bdp,
 134         int                     fl,
 135         struct cred             *cr)
 136 {
 137         struct bhv_desc         *next = bdp;
 138
 139         ASSERT(next);
 140         while (! (bhvtovfsops(next))->vfs_sync)
 141                 next = BHV_NEXT(next);
 142         return ((*bhvtovfsops(next)->vfs_sync)(next, fl, cr));
 143 }
 144
 145 int
 146 vfs_vget(
 147         struct bhv_desc         *bdp,
 148         struct vnode            **vpp,
 149         struct fid              *fidp)
 150 {
 151         struct bhv_desc         *next = bdp;
 152
 153         ASSERT(next);
 154         while (! (bhvtovfsops(next))->vfs_vget)
 155                 next = BHV_NEXT(next);
 156         return ((*bhvtovfsops(next)->vfs_vget)(next, vpp, fidp));
 157 }
 158
 159 int
 160 vfs_dmapiops(
 161         struct bhv_desc         *bdp,
 162         caddr_t                 addr)
 163 {
 164         struct bhv_desc         *next = bdp;
 165
 166         ASSERT(next);
 167         while (! (bhvtovfsops(next))->vfs_dmapiops)
 168                 next = BHV_NEXT(next);
 169         return ((*bhvtovfsops(next)->vfs_dmapiops)(next, addr));
 170 }
 171
 172 int
 173 vfs_quotactl(
 174         struct bhv_desc         *bdp,
 175         int                     cmd,
 176         int                     id,
 177         caddr_t                 addr)
 178 {
 179         struct bhv_desc         *next = bdp;
 180
 181         ASSERT(next);
 182         while (! (bhvtovfsops(next))->vfs_quotactl)
 183                 next = BHV_NEXT(next);
 184         return ((*bhvtovfsops(next)->vfs_quotactl)(next, cmd, id, addr));
 185 }
 186
 187 void
 188 vfs_init_vnode(
 189         struct bhv_desc         *bdp,
 190         struct vnode            *vp,
 191         struct bhv_desc         *bp,
 192         int                     unlock)
 193 {
 194         struct bhv_desc         *next = bdp;
 195
 196         ASSERT(next);
 197         while (! (bhvtovfsops(next))->vfs_init_vnode)
 198                 next = BHV_NEXT(next);
 199         ((*bhvtovfsops(next)->vfs_init_vnode)(next, vp, bp, unlock));
 200 }
 201
 202 void
 203 vfs_force_shutdown(
 204         struct bhv_desc         *bdp,
 205         int                     fl,
 206         char                    *file,
 207         int                     line)
 208 {
 209         struct bhv_desc         *next = bdp;
 210
 211         ASSERT(next);
 212         while (! (bhvtovfsops(next))->vfs_force_shutdown)
 213                 next = BHV_NEXT(next);
 214         ((*bhvtovfsops(next)->vfs_force_shutdown)(next, fl, file, line));
 215 }
 216
 217 void
 218 vfs_freeze(
 219         struct bhv_desc         *bdp)
 220 {
 221         struct bhv_desc         *next = bdp;
 222
 223         ASSERT(next);
 224         while (! (bhvtovfsops(next))->vfs_freeze)
 225                 next = BHV_NEXT(next);
 226         ((*bhvtovfsops(next)->vfs_freeze)(next));
 227 }
 228
 229 vfs_t *
 230 vfs_allocate(
 231         struct super_block      *sb)
 232 {
 233         struct vfs              *vfsp;
 234
 235         vfsp = kmem_zalloc(sizeof(vfs_t), KM_SLEEP);
 236         bhv_head_init(VFS_BHVHEAD(vfsp), "vfs");
 237         INIT_LIST_HEAD(&vfsp->vfs_sync_list);
 238         spin_lock_init(&vfsp->vfs_sync_lock);
 239         init_waitqueue_head(&vfsp->vfs_wait_single_sync_task);
 240
 241         vfsp->vfs_super = sb;
 242         sb->s_fs_info = vfsp;
 243
 244         if (sb->s_flags & MS_RDONLY)
 245                 vfsp->vfs_flag |= VFS_RDONLY;
 246
 247         return vfsp;
 248 }
 249
 250 vfs_t *
 251 vfs_from_sb(
 252         struct super_block      *sb)
 253 {
 254         return (vfs_t *)sb->s_fs_info;
 255 }
 256
 257 void
 258 vfs_deallocate(
 259         struct vfs              *vfsp)
 260 {
 261         bhv_head_destroy(VFS_BHVHEAD(vfsp));
 262         kmem_free(vfsp, sizeof(vfs_t));
 263 }
 264
 265 void
 266 vfs_insertops(
 267         struct vfs              *vfsp,
 268         struct bhv_vfsops       *vfsops)
 269 {
 270         struct bhv_desc         *bdp;
 271
 272         bdp = kmem_alloc(sizeof(struct bhv_desc), KM_SLEEP);
 273         bhv_desc_init(bdp, NULL, vfsp, vfsops);
 274         bhv_insert(&vfsp->vfs_bh, bdp);
 275 }
 276
 277 void
 278 vfs_insertbhv(
 279         struct vfs              *vfsp,
 280         struct bhv_desc         *bdp,
 281         struct vfsops           *vfsops,
 282         void                    *mount)
 283 {
 284         bhv_desc_init(bdp, mount, vfsp, vfsops);
 285         bhv_insert_initial(&vfsp->vfs_bh, bdp);
 286 }
 287
 288 void
 289 bhv_remove_vfsops(
 290         struct vfs              *vfsp,
 291         int                     pos)
 292 {
 293         struct bhv_desc         *bhv;
 294
 295         bhv = bhv_lookup_range(&vfsp->vfs_bh, pos, pos);
 296         if (!bhv)
 297                 return;
 298         bhv_remove(&vfsp->vfs_bh, bhv);
 299         kmem_free(bhv, sizeof(*bhv));
 300 }
 301
 302 void
 303 bhv_remove_all_vfsops(
 304         struct vfs              *vfsp,
 305         int                     freebase)
 306 {
 307         struct xfs_mount        *mp;
 308
 309         bhv_remove_vfsops(vfsp, VFS_POSITION_QM);
 310         bhv_remove_vfsops(vfsp, VFS_POSITION_DM);
 311         if (!freebase)
 312                 return;
 313         mp = XFS_VFSTOM(vfsp);
 314         VFS_REMOVEBHV(vfsp, &mp->m_bhv);
 315         xfs_mount_free(mp, 0);
 316 }
 317
 318 void
 319 bhv_insert_all_vfsops(
 320         struct vfs              *vfsp)
 321 {
 322         struct xfs_mount        *mp;
 323
 324         mp = xfs_mount_init();
 325         vfs_insertbhv(vfsp, &mp->m_bhv, &xfs_vfsops, mp);
 326         vfs_insertdmapi(vfsp);
 327         vfs_insertquota(vfsp);
 328 }