release/src-rt-6.x/linux/linux-2.6/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_dir2.h"
  27 #include "xfs_imap.h"
  28 #include "xfs_alloc.h"
  29 #include "xfs_dmapi.h"
  30 #include "xfs_mount.h"
  31 #include "xfs_quota.h"
  32
  33 int
  34 vfs_mount(
  35         struct bhv_desc         *bdp,
  36         struct xfs_mount_args   *args,
  37         struct cred             *cr)
  38 {
  39         struct bhv_desc         *next = bdp;
  40
  41         ASSERT(next);
  42         while (! (bhvtovfsops(next))->vfs_mount)
  43                 next = BHV_NEXT(next);
  44         return ((*bhvtovfsops(next)->vfs_mount)(next, args, cr));
  45 }
  46
  47 int
  48 vfs_parseargs(
  49         struct bhv_desc         *bdp,
  50         char                    *s,
  51         struct xfs_mount_args   *args,
  52         int                     f)
  53 {
  54         struct bhv_desc         *next = bdp;
  55
  56         ASSERT(next);
  57         while (! (bhvtovfsops(next))->vfs_parseargs)
  58                 next = BHV_NEXT(next);
  59         return ((*bhvtovfsops(next)->vfs_parseargs)(next, s, args, f));
  60 }
  61
  62 int
  63 vfs_showargs(
  64         struct bhv_desc         *bdp,
  65         struct seq_file         *m)
  66 {
  67         struct bhv_desc         *next = bdp;
  68
  69         ASSERT(next);
  70         while (! (bhvtovfsops(next))->vfs_showargs)
  71                 next = BHV_NEXT(next);
  72         return ((*bhvtovfsops(next)->vfs_showargs)(next, m));
  73 }
  74
  75 int
  76 vfs_unmount(
  77         struct bhv_desc         *bdp,
  78         int                     fl,
  79         struct cred             *cr)
  80 {
  81         struct bhv_desc         *next = bdp;
  82
  83         ASSERT(next);
  84         while (! (bhvtovfsops(next))->vfs_unmount)
  85                 next = BHV_NEXT(next);
  86         return ((*bhvtovfsops(next)->vfs_unmount)(next, fl, cr));
  87 }
  88
  89 int
  90 vfs_mntupdate(
  91         struct bhv_desc         *bdp,
  92         int                     *fl,
  93         struct xfs_mount_args   *args)
  94 {
  95         struct bhv_desc         *next = bdp;
  96
  97         ASSERT(next);
  98         while (! (bhvtovfsops(next))->vfs_mntupdate)
  99                 next = BHV_NEXT(next);
 100         return ((*bhvtovfsops(next)->vfs_mntupdate)(next, fl, args));
 101 }
 102
 103 int
 104 vfs_root(
 105         struct bhv_desc         *bdp,
 106         struct bhv_vnode        **vpp)
 107 {
 108         struct bhv_desc         *next = bdp;
 109
 110         ASSERT(next);
 111         while (! (bhvtovfsops(next))->vfs_root)
 112                 next = BHV_NEXT(next);
 113         return ((*bhvtovfsops(next)->vfs_root)(next, vpp));
 114 }
 115
 116 int
 117 vfs_statvfs(
 118         struct bhv_desc         *bdp,
 119         bhv_statvfs_t           *statp,
 120         struct bhv_vnode        *vp)
 121 {
 122         struct bhv_desc         *next = bdp;
 123
 124         ASSERT(next);
 125         while (! (bhvtovfsops(next))->vfs_statvfs)
 126                 next = BHV_NEXT(next);
 127         return ((*bhvtovfsops(next)->vfs_statvfs)(next, statp, vp));
 128 }
 129
 130 int
 131 vfs_sync(
 132         struct bhv_desc         *bdp,
 133         int                     fl,
 134         struct cred             *cr)
 135 {
 136         struct bhv_desc         *next = bdp;
 137
 138         ASSERT(next);
 139         while (! (bhvtovfsops(next))->vfs_sync)
 140                 next = BHV_NEXT(next);
 141         return ((*bhvtovfsops(next)->vfs_sync)(next, fl, cr));
 142 }
 143
 144 int
 145 vfs_vget(
 146         struct bhv_desc         *bdp,
 147         struct bhv_vnode        **vpp,
 148         struct xfs_fid          *fidp)
 149 {
 150         struct bhv_desc         *next = bdp;
 151
 152         ASSERT(next);
 153         while (! (bhvtovfsops(next))->vfs_vget)
 154                 next = BHV_NEXT(next);
 155         return ((*bhvtovfsops(next)->vfs_vget)(next, vpp, fidp));
 156 }
 157
 158 int
 159 vfs_dmapiops(
 160         struct bhv_desc         *bdp,
 161         caddr_t                 addr)
 162 {
 163         struct bhv_desc         *next = bdp;
 164
 165         ASSERT(next);
 166         while (! (bhvtovfsops(next))->vfs_dmapiops)
 167                 next = BHV_NEXT(next);
 168         return ((*bhvtovfsops(next)->vfs_dmapiops)(next, addr));
 169 }
 170
 171 int
 172 vfs_quotactl(
 173         struct bhv_desc         *bdp,
 174         int                     cmd,
 175         int                     id,
 176         caddr_t                 addr)
 177 {
 178         struct bhv_desc         *next = bdp;
 179
 180         ASSERT(next);
 181         while (! (bhvtovfsops(next))->vfs_quotactl)
 182                 next = BHV_NEXT(next);
 183         return ((*bhvtovfsops(next)->vfs_quotactl)(next, cmd, id, addr));
 184 }
 185
 186 void
 187 vfs_init_vnode(
 188         struct bhv_desc         *bdp,
 189         struct bhv_vnode        *vp,
 190         struct bhv_desc         *bp,
 191         int                     unlock)
 192 {
 193         struct bhv_desc         *next = bdp;
 194
 195         ASSERT(next);
 196         while (! (bhvtovfsops(next))->vfs_init_vnode)
 197                 next = BHV_NEXT(next);
 198         ((*bhvtovfsops(next)->vfs_init_vnode)(next, vp, bp, unlock));
 199 }
 200
 201 void
 202 vfs_force_shutdown(
 203         struct bhv_desc         *bdp,
 204         int                     fl,
 205         char                    *file,
 206         int                     line)
 207 {
 208         struct bhv_desc         *next = bdp;
 209
 210         ASSERT(next);
 211         while (! (bhvtovfsops(next))->vfs_force_shutdown)
 212                 next = BHV_NEXT(next);
 213         ((*bhvtovfsops(next)->vfs_force_shutdown)(next, fl, file, line));
 214 }
 215
 216 void
 217 vfs_freeze(
 218         struct bhv_desc         *bdp)
 219 {
 220         struct bhv_desc         *next = bdp;
 221
 222         ASSERT(next);
 223         while (! (bhvtovfsops(next))->vfs_freeze)
 224                 next = BHV_NEXT(next);
 225         ((*bhvtovfsops(next)->vfs_freeze)(next));
 226 }
 227
 228 bhv_vfs_t *
 229 vfs_allocate(
 230         struct super_block      *sb)
 231 {
 232         struct bhv_vfs          *vfsp;
 233
 234         vfsp = kmem_zalloc(sizeof(bhv_vfs_t), KM_SLEEP);
 235         bhv_head_init(VFS_BHVHEAD(vfsp), "vfs");
 236         INIT_LIST_HEAD(&vfsp->vfs_sync_list);
 237         spin_lock_init(&vfsp->vfs_sync_lock);
 238         init_waitqueue_head(&vfsp->vfs_wait_single_sync_task);
 239
 240         vfsp->vfs_super = sb;
 241         sb->s_fs_info = vfsp;
 242
 243         if (sb->s_flags & MS_RDONLY)
 244                 vfsp->vfs_flag |= VFS_RDONLY;
 245
 246         return vfsp;
 247 }
 248
 249 bhv_vfs_t *
 250 vfs_from_sb(
 251         struct super_block      *sb)
 252 {
 253         return (bhv_vfs_t *)sb->s_fs_info;
 254 }
 255
 256 void
 257 vfs_deallocate(
 258         struct bhv_vfs          *vfsp)
 259 {
 260         bhv_head_destroy(VFS_BHVHEAD(vfsp));
 261         kmem_free(vfsp, sizeof(bhv_vfs_t));
 262 }
 263
 264 void
 265 vfs_insertops(
 266         struct bhv_vfs          *vfsp,
 267         struct bhv_module_vfsops *vfsops)
 268 {
 269         struct bhv_desc         *bdp;
 270
 271         bdp = kmem_alloc(sizeof(struct bhv_desc), KM_SLEEP);
 272         bhv_desc_init(bdp, NULL, vfsp, vfsops);
 273         bhv_insert(&vfsp->vfs_bh, bdp);
 274 }
 275
 276 void
 277 vfs_insertbhv(
 278         struct bhv_vfs          *vfsp,
 279         struct bhv_desc         *bdp,
 280         struct bhv_vfsops       *vfsops,
 281         void                    *mount)
 282 {
 283         bhv_desc_init(bdp, mount, vfsp, vfsops);
 284         bhv_insert_initial(&vfsp->vfs_bh, bdp);
 285 }
 286
 287 void
 288 bhv_remove_vfsops(
 289         struct bhv_vfs          *vfsp,
 290         int                     pos)
 291 {
 292         struct bhv_desc         *bhv;
 293
 294         bhv = bhv_lookup_range(&vfsp->vfs_bh, pos, pos);
 295         if (!bhv)
 296                 return;
 297         bhv_remove(&vfsp->vfs_bh, bhv);
 298         kmem_free(bhv, sizeof(*bhv));
 299 }
 300
 301 void
 302 bhv_remove_all_vfsops(
 303         struct bhv_vfs          *vfsp,
 304         int                     freebase)
 305 {
 306         struct xfs_mount        *mp;
 307
 308         bhv_remove_vfsops(vfsp, VFS_POSITION_QM);
 309         bhv_remove_vfsops(vfsp, VFS_POSITION_DM);
 310         if (!freebase)
 311                 return;
 312         mp = XFS_VFSTOM(vfsp);
 313         VFS_REMOVEBHV(vfsp, &mp->m_bhv);
 314         xfs_mount_free(mp, 0);
 315 }
 316
 317 void
 318 bhv_insert_all_vfsops(
 319         struct bhv_vfs          *vfsp)
 320 {
 321         struct xfs_mount        *mp;
 322
 323         mp = xfs_mount_init();
 324         vfs_insertbhv(vfsp, &mp->m_bhv, &xfs_vfsops, mp);
 325         vfs_insertdmapi(vfsp);
 326         vfs_insertquota(vfsp);
 327 }