fs/ocfs2/dlmglue.h

   1 /* -*- mode: c; c-basic-offset: 8; -*-
   2  * vim: noexpandtab sw=8 ts=8 sts=0:
   3  *
   4  * dlmglue.h
   5  *
   6  * description here
   7  *
   8  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   9  *
  10  * This program is free software; you can redistribute it and/or
  11  * modify it under the terms of the GNU General Public
  12  * License as published by the Free Software Foundation; either
  13  * version 2 of the License, or (at your option) any later version.
  14  *
  15  * This program is distributed in the hope that it will be useful,
  16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  18  * General Public License for more details.
  19  *
  20  * You should have received a copy of the GNU General Public
  21  * License along with this program; if not, write to the
  22  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
  23  * Boston, MA 021110-1307, USA.
  24  */
  25
  26
  27 #ifndef DLMGLUE_H
  28 #define DLMGLUE_H
  29
  30 #include "dcache.h"
  31
  32 #define OCFS2_LVB_VERSION 5
  33
  34 struct ocfs2_meta_lvb {
  35         __u8         lvb_version;
  36         __u8         lvb_reserved0;
  37         __be16       lvb_idynfeatures;
  38         __be32       lvb_iclusters;
  39         __be32       lvb_iuid;
  40         __be32       lvb_igid;
  41         __be64       lvb_iatime_packed;
  42         __be64       lvb_ictime_packed;
  43         __be64       lvb_imtime_packed;
  44         __be64       lvb_isize;
  45         __be16       lvb_imode;
  46         __be16       lvb_inlink;
  47         __be32       lvb_iattr;
  48         __be32       lvb_igeneration;
  49         __be32       lvb_reserved2;
  50 };
  51
  52 #define OCFS2_QINFO_LVB_VERSION 1
  53
  54 struct ocfs2_qinfo_lvb {
  55         __u8    lvb_version;
  56         __u8    lvb_reserved[3];
  57         __be32  lvb_bgrace;
  58         __be32  lvb_igrace;
  59         __be32  lvb_syncms;
  60         __be32  lvb_blocks;
  61         __be32  lvb_free_blk;
  62         __be32  lvb_free_entry;
  63 };
  64
  65 #define OCFS2_ORPHAN_LVB_VERSION 1
  66
  67 struct ocfs2_orphan_scan_lvb {
  68         __u8    lvb_version;
  69         __u8    lvb_reserved[3];
  70         __be32  lvb_os_seqno;
  71 };
  72
  73 #define OCFS2_TRIMFS_LVB_VERSION 1
  74
  75 struct ocfs2_trim_fs_lvb {
  76         __u8    lvb_version;
  77         __u8    lvb_success;
  78         __u8    lvb_reserved[2];
  79         __be32  lvb_nodenum;
  80         __be64  lvb_start;
  81         __be64  lvb_len;
  82         __be64  lvb_minlen;
  83         __be64  lvb_trimlen;
  84 };
  85
  86 struct ocfs2_trim_fs_info {
  87         u8      tf_valid;       /* lvb is valid, or not */
  88         u8      tf_success;     /* trim is successful, or not */
  89         u32     tf_nodenum;     /* osb node number */
  90         u64     tf_start;       /* trim start offset in clusters */
  91         u64     tf_len;         /* trim end offset in clusters */
  92         u64     tf_minlen;      /* trim minimum contiguous free clusters */
  93         u64     tf_trimlen;     /* trimmed length in bytes */
  94 };
  95
  96 struct ocfs2_lock_holder {
  97         struct list_head oh_list;
  98         struct pid *oh_owner_pid;
  99         int oh_ex;
 100 };
 101
 102 /* ocfs2_inode_lock_full() 'arg_flags' flags */
 103 /* don't wait on recovery. */
 104 #define OCFS2_META_LOCK_RECOVERY        (0x01)
 105 /* Instruct the dlm not to queue ourselves on the other node. */
 106 #define OCFS2_META_LOCK_NOQUEUE         (0x02)
 107 /* don't block waiting for the downconvert thread, instead return -EAGAIN */
 108 #define OCFS2_LOCK_NONBLOCK             (0x04)
 109 /* just get back disk inode bh if we've got cluster lock. */
 110 #define OCFS2_META_LOCK_GETBH           (0x08)
 111
 112 /* Locking subclasses of inode cluster lock */
 113 enum {
 114         OI_LS_NORMAL = 0,
 115         OI_LS_PARENT,
 116         OI_LS_RENAME1,
 117         OI_LS_RENAME2,
 118         OI_LS_REFLINK_TARGET,
 119 };
 120
 121 int ocfs2_dlm_init(struct ocfs2_super *osb);
 122 void ocfs2_dlm_shutdown(struct ocfs2_super *osb, int hangup_pending);
 123 void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res);
 124 void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
 125                                enum ocfs2_lock_type type,
 126                                unsigned int generation,
 127                                struct inode *inode);
 128 void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
 129                                 u64 parent, struct inode *inode);
 130 struct ocfs2_file_private;
 131 void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres,
 132                               struct ocfs2_file_private *fp);
 133 struct ocfs2_mem_dqinfo;
 134 void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres,
 135                                struct ocfs2_mem_dqinfo *info);
 136 void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres,
 137                                   struct ocfs2_super *osb, u64 ref_blkno,
 138                                   unsigned int generation);
 139 void ocfs2_lock_res_free(struct ocfs2_lock_res *res);
 140 int ocfs2_create_new_inode_locks(struct inode *inode);
 141 int ocfs2_drop_inode_locks(struct inode *inode);
 142 int ocfs2_rw_lock(struct inode *inode, int write);
 143 int ocfs2_try_rw_lock(struct inode *inode, int write);
 144 void ocfs2_rw_unlock(struct inode *inode, int write);
 145 int ocfs2_open_lock(struct inode *inode);
 146 int ocfs2_try_open_lock(struct inode *inode, int write);
 147 void ocfs2_open_unlock(struct inode *inode);
 148 int ocfs2_inode_lock_atime(struct inode *inode,
 149                           struct vfsmount *vfsmnt,
 150                           int *level, int wait);
 151 int ocfs2_inode_lock_full_nested(struct inode *inode,
 152                          struct buffer_head **ret_bh,
 153                          int ex,
 154                          int arg_flags,
 155                          int subclass);
 156 int ocfs2_inode_lock_with_page(struct inode *inode,
 157                               struct buffer_head **ret_bh,
 158                               int ex,
 159                               struct page *page);
 160 /* Variants without special locking class or flags */
 161 #define ocfs2_inode_lock_full(i, r, e, f)\
 162                 ocfs2_inode_lock_full_nested(i, r, e, f, OI_LS_NORMAL)
 163 #define ocfs2_inode_lock_nested(i, b, e, s)\
 164                 ocfs2_inode_lock_full_nested(i, b, e, 0, s)
 165 /* 99% of the time we don't want to supply any additional flags --
 166  * those are for very specific cases only. */
 167 #define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full_nested(i, b, e, 0, OI_LS_NORMAL)
 168 #define ocfs2_try_inode_lock(i, b, e)\
 169                 ocfs2_inode_lock_full_nested(i, b, e, OCFS2_META_LOCK_NOQUEUE,\
 170                 OI_LS_NORMAL)
 171 void ocfs2_inode_unlock(struct inode *inode,
 172                        int ex);
 173 int ocfs2_super_lock(struct ocfs2_super *osb,
 174                      int ex);
 175 void ocfs2_super_unlock(struct ocfs2_super *osb,
 176                         int ex);
 177 int ocfs2_orphan_scan_lock(struct ocfs2_super *osb, u32 *seqno);
 178 void ocfs2_orphan_scan_unlock(struct ocfs2_super *osb, u32 seqno);
 179
 180 int ocfs2_rename_lock(struct ocfs2_super *osb);
 181 void ocfs2_rename_unlock(struct ocfs2_super *osb);
 182 int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex);
 183 void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex);
 184 void ocfs2_trim_fs_lock_res_init(struct ocfs2_super *osb);
 185 void ocfs2_trim_fs_lock_res_uninit(struct ocfs2_super *osb);
 186 int ocfs2_trim_fs_lock(struct ocfs2_super *osb,
 187                        struct ocfs2_trim_fs_info *info, int trylock);
 188 void ocfs2_trim_fs_unlock(struct ocfs2_super *osb,
 189                           struct ocfs2_trim_fs_info *info);
 190 int ocfs2_dentry_lock(struct dentry *dentry, int ex);
 191 void ocfs2_dentry_unlock(struct dentry *dentry, int ex);
 192 int ocfs2_file_lock(struct file *file, int ex, int trylock);
 193 void ocfs2_file_unlock(struct file *file);
 194 int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex);
 195 void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex);
 196 struct ocfs2_refcount_tree;
 197 int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex);
 198 void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex);
 199
 200
 201 void ocfs2_mark_lockres_freeing(struct ocfs2_super *osb,
 202                                 struct ocfs2_lock_res *lockres);
 203 void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
 204                                struct ocfs2_lock_res *lockres);
 205
 206 /* for the downconvert thread */
 207 void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb);
 208
 209 struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void);
 210 void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug);
 211
 212 /* To set the locking protocol on module initialization */
 213 void ocfs2_set_locking_protocol(void);
 214
 215 /* The _tracker pair is used to avoid cluster recursive locking */
 216 int ocfs2_inode_lock_tracker(struct inode *inode,
 217                              struct buffer_head **ret_bh,
 218                              int ex,
 219                              struct ocfs2_lock_holder *oh);
 220 void ocfs2_inode_unlock_tracker(struct inode *inode,
 221                                 int ex,
 222                                 struct ocfs2_lock_holder *oh,
 223                                 int had_lock);
 224
 225 #endif  /* DLMGLUE_H */