fs/ocfs2/dlmglue.h

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 /*
   3  * dlmglue.h
   4  *
   5  * description here
   6  *
   7  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
   8  */
   9
  10
  11 #ifndef DLMGLUE_H
  12 #define DLMGLUE_H
  13
  14 #include "dcache.h"
  15
  16 #define OCFS2_LVB_VERSION 5
  17
  18 struct ocfs2_meta_lvb {
  19         __u8         lvb_version;
  20         __u8         lvb_reserved0;
  21         __be16       lvb_idynfeatures;
  22         __be32       lvb_iclusters;
  23         __be32       lvb_iuid;
  24         __be32       lvb_igid;
  25         __be64       lvb_iatime_packed;
  26         __be64       lvb_ictime_packed;
  27         __be64       lvb_imtime_packed;
  28         __be64       lvb_isize;
  29         __be16       lvb_imode;
  30         __be16       lvb_inlink;
  31         __be32       lvb_iattr;
  32         __be32       lvb_igeneration;
  33         __be32       lvb_reserved2;
  34 };
  35
  36 #define OCFS2_QINFO_LVB_VERSION 1
  37
  38 struct ocfs2_qinfo_lvb {
  39         __u8    lvb_version;
  40         __u8    lvb_reserved[3];
  41         __be32  lvb_bgrace;
  42         __be32  lvb_igrace;
  43         __be32  lvb_syncms;
  44         __be32  lvb_blocks;
  45         __be32  lvb_free_blk;
  46         __be32  lvb_free_entry;
  47 };
  48
  49 #define OCFS2_ORPHAN_LVB_VERSION 1
  50
  51 struct ocfs2_orphan_scan_lvb {
  52         __u8    lvb_version;
  53         __u8    lvb_reserved[3];
  54         __be32  lvb_os_seqno;
  55 };
  56
  57 #define OCFS2_TRIMFS_LVB_VERSION 1
  58
  59 struct ocfs2_trim_fs_lvb {
  60         __u8    lvb_version;
  61         __u8    lvb_success;
  62         __u8    lvb_reserved[2];
  63         __be32  lvb_nodenum;
  64         __be64  lvb_start;
  65         __be64  lvb_len;
  66         __be64  lvb_minlen;
  67         __be64  lvb_trimlen;
  68 };
  69
  70 struct ocfs2_trim_fs_info {
  71         u8      tf_valid;       /* lvb is valid, or not */
  72         u8      tf_success;     /* trim is successful, or not */
  73         u32     tf_nodenum;     /* osb node number */
  74         u64     tf_start;       /* trim start offset in clusters */
  75         u64     tf_len;         /* trim end offset in clusters */
  76         u64     tf_minlen;      /* trim minimum contiguous free clusters */
  77         u64     tf_trimlen;     /* trimmed length in bytes */
  78 };
  79
  80 struct ocfs2_lock_holder {
  81         struct list_head oh_list;
  82         struct pid *oh_owner_pid;
  83         int oh_ex;
  84 };
  85
  86 /* ocfs2_inode_lock_full() 'arg_flags' flags */
  87 /* don't wait on recovery. */
  88 #define OCFS2_META_LOCK_RECOVERY        (0x01)
  89 /* Instruct the dlm not to queue ourselves on the other node. */
  90 #define OCFS2_META_LOCK_NOQUEUE         (0x02)
  91 /* don't block waiting for the downconvert thread, instead return -EAGAIN */
  92 #define OCFS2_LOCK_NONBLOCK             (0x04)
  93 /* just get back disk inode bh if we've got cluster lock. */
  94 #define OCFS2_META_LOCK_GETBH           (0x08)
  95
  96 /* Locking subclasses of inode cluster lock */
  97 enum {
  98         OI_LS_NORMAL = 0,
  99         OI_LS_PARENT,
 100         OI_LS_RENAME1,
 101         OI_LS_RENAME2,
 102         OI_LS_REFLINK_TARGET,
 103 };
 104
 105 int ocfs2_dlm_init(struct ocfs2_super *osb);
 106 void ocfs2_dlm_shutdown(struct ocfs2_super *osb, int hangup_pending);
 107 void ocfs2_lock_res_init_once(struct ocfs2_lock_res *res);
 108 void ocfs2_inode_lock_res_init(struct ocfs2_lock_res *res,
 109                                enum ocfs2_lock_type type,
 110                                unsigned int generation,
 111                                struct inode *inode);
 112 void ocfs2_dentry_lock_res_init(struct ocfs2_dentry_lock *dl,
 113                                 u64 parent, struct inode *inode);
 114 struct ocfs2_file_private;
 115 void ocfs2_file_lock_res_init(struct ocfs2_lock_res *lockres,
 116                               struct ocfs2_file_private *fp);
 117 struct ocfs2_mem_dqinfo;
 118 void ocfs2_qinfo_lock_res_init(struct ocfs2_lock_res *lockres,
 119                                struct ocfs2_mem_dqinfo *info);
 120 void ocfs2_refcount_lock_res_init(struct ocfs2_lock_res *lockres,
 121                                   struct ocfs2_super *osb, u64 ref_blkno,
 122                                   unsigned int generation);
 123 void ocfs2_lock_res_free(struct ocfs2_lock_res *res);
 124 int ocfs2_create_new_inode_locks(struct inode *inode);
 125 int ocfs2_drop_inode_locks(struct inode *inode);
 126 int ocfs2_rw_lock(struct inode *inode, int write);
 127 int ocfs2_try_rw_lock(struct inode *inode, int write);
 128 void ocfs2_rw_unlock(struct inode *inode, int write);
 129 int ocfs2_open_lock(struct inode *inode);
 130 int ocfs2_try_open_lock(struct inode *inode, int write);
 131 void ocfs2_open_unlock(struct inode *inode);
 132 int ocfs2_inode_lock_atime(struct inode *inode,
 133                           struct vfsmount *vfsmnt,
 134                           int *level, int wait);
 135 int ocfs2_inode_lock_full_nested(struct inode *inode,
 136                          struct buffer_head **ret_bh,
 137                          int ex,
 138                          int arg_flags,
 139                          int subclass);
 140 int ocfs2_inode_lock_with_page(struct inode *inode,
 141                               struct buffer_head **ret_bh,
 142                               int ex,
 143                               struct page *page);
 144 /* Variants without special locking class or flags */
 145 #define ocfs2_inode_lock_full(i, r, e, f)\
 146                 ocfs2_inode_lock_full_nested(i, r, e, f, OI_LS_NORMAL)
 147 #define ocfs2_inode_lock_nested(i, b, e, s)\
 148                 ocfs2_inode_lock_full_nested(i, b, e, 0, s)
 149 /* 99% of the time we don't want to supply any additional flags --
 150  * those are for very specific cases only. */
 151 #define ocfs2_inode_lock(i, b, e) ocfs2_inode_lock_full_nested(i, b, e, 0, OI_LS_NORMAL)
 152 #define ocfs2_try_inode_lock(i, b, e)\
 153                 ocfs2_inode_lock_full_nested(i, b, e, OCFS2_META_LOCK_NOQUEUE,\
 154                 OI_LS_NORMAL)
 155 void ocfs2_inode_unlock(struct inode *inode,
 156                        int ex);
 157 int ocfs2_super_lock(struct ocfs2_super *osb,
 158                      int ex);
 159 void ocfs2_super_unlock(struct ocfs2_super *osb,
 160                         int ex);
 161 int ocfs2_orphan_scan_lock(struct ocfs2_super *osb, u32 *seqno);
 162 void ocfs2_orphan_scan_unlock(struct ocfs2_super *osb, u32 seqno);
 163
 164 int ocfs2_rename_lock(struct ocfs2_super *osb);
 165 void ocfs2_rename_unlock(struct ocfs2_super *osb);
 166 int ocfs2_nfs_sync_lock(struct ocfs2_super *osb, int ex);
 167 void ocfs2_nfs_sync_unlock(struct ocfs2_super *osb, int ex);
 168 void ocfs2_trim_fs_lock_res_init(struct ocfs2_super *osb);
 169 void ocfs2_trim_fs_lock_res_uninit(struct ocfs2_super *osb);
 170 int ocfs2_trim_fs_lock(struct ocfs2_super *osb,
 171                        struct ocfs2_trim_fs_info *info, int trylock);
 172 void ocfs2_trim_fs_unlock(struct ocfs2_super *osb,
 173                           struct ocfs2_trim_fs_info *info);
 174 int ocfs2_dentry_lock(struct dentry *dentry, int ex);
 175 void ocfs2_dentry_unlock(struct dentry *dentry, int ex);
 176 int ocfs2_file_lock(struct file *file, int ex, int trylock);
 177 void ocfs2_file_unlock(struct file *file);
 178 int ocfs2_qinfo_lock(struct ocfs2_mem_dqinfo *oinfo, int ex);
 179 void ocfs2_qinfo_unlock(struct ocfs2_mem_dqinfo *oinfo, int ex);
 180 struct ocfs2_refcount_tree;
 181 int ocfs2_refcount_lock(struct ocfs2_refcount_tree *ref_tree, int ex);
 182 void ocfs2_refcount_unlock(struct ocfs2_refcount_tree *ref_tree, int ex);
 183
 184
 185 void ocfs2_mark_lockres_freeing(struct ocfs2_super *osb,
 186                                 struct ocfs2_lock_res *lockres);
 187 void ocfs2_simple_drop_lockres(struct ocfs2_super *osb,
 188                                struct ocfs2_lock_res *lockres);
 189
 190 /* for the downconvert thread */
 191 void ocfs2_wake_downconvert_thread(struct ocfs2_super *osb);
 192
 193 struct ocfs2_dlm_debug *ocfs2_new_dlm_debug(void);
 194 void ocfs2_put_dlm_debug(struct ocfs2_dlm_debug *dlm_debug);
 195
 196 /* To set the locking protocol on module initialization */
 197 void ocfs2_set_locking_protocol(void);
 198
 199 /* The _tracker pair is used to avoid cluster recursive locking */
 200 int ocfs2_inode_lock_tracker(struct inode *inode,
 201                              struct buffer_head **ret_bh,
 202                              int ex,
 203                              struct ocfs2_lock_holder *oh);
 204 void ocfs2_inode_unlock_tracker(struct inode *inode,
 205                                 int ex,
 206                                 struct ocfs2_lock_holder *oh,
 207                                 int had_lock);
 208
 209 #endif  /* DLMGLUE_H */