fs/xfs/xfs_icreate_item.c

   1 /*
   2  * Copyright (c) 2008-2010, 2013 Dave Chinner
   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_shared.h"
  21 #include "xfs_log_format.h"
  22 #include "xfs_trans_resv.h"
  23 #include "xfs_bit.h"
  24 #include "xfs_sb.h"
  25 #include "xfs_ag.h"
  26 #include "xfs_mount.h"
  27 #include "xfs_trans.h"
  28 #include "xfs_trans_priv.h"
  29 #include "xfs_error.h"
  30 #include "xfs_icreate_item.h"
  31
  32 kmem_zone_t     *xfs_icreate_zone;              /* inode create item zone */
  33
  34 static inline struct xfs_icreate_item *ICR_ITEM(struct xfs_log_item *lip)
  35 {
  36         return container_of(lip, struct xfs_icreate_item, ic_item);
  37 }
  38
  39 /*
  40  * This returns the number of iovecs needed to log the given inode item.
  41  *
  42  * We only need one iovec for the icreate log structure.
  43  */
  44 STATIC void
  45 xfs_icreate_item_size(
  46         struct xfs_log_item     *lip,
  47         int                     *nvecs,
  48         int                     *nbytes)
  49 {
  50         *nvecs += 1;
  51         *nbytes += sizeof(struct xfs_icreate_log);
  52 }
  53
  54 /*
  55  * This is called to fill in the vector of log iovecs for the
  56  * given inode create log item.
  57  */
  58 STATIC void
  59 xfs_icreate_item_format(
  60         struct xfs_log_item     *lip,
  61         struct xfs_log_iovec    *log_vector)
  62 {
  63         struct xfs_icreate_item *icp = ICR_ITEM(lip);
  64
  65         log_vector->i_addr = (xfs_caddr_t)&icp->ic_format;
  66         log_vector->i_len  = sizeof(struct xfs_icreate_log);
  67         log_vector->i_type = XLOG_REG_TYPE_ICREATE;
  68 }
  69
  70
  71 /* Pinning has no meaning for the create item, so just return. */
  72 STATIC void
  73 xfs_icreate_item_pin(
  74         struct xfs_log_item     *lip)
  75 {
  76 }
  77
  78
  79 /* pinning has no meaning for the create item, so just return. */
  80 STATIC void
  81 xfs_icreate_item_unpin(
  82         struct xfs_log_item     *lip,
  83         int                     remove)
  84 {
  85 }
  86
  87 STATIC void
  88 xfs_icreate_item_unlock(
  89         struct xfs_log_item     *lip)
  90 {
  91         struct xfs_icreate_item *icp = ICR_ITEM(lip);
  92
  93         if (icp->ic_item.li_flags & XFS_LI_ABORTED)
  94                 kmem_zone_free(xfs_icreate_zone, icp);
  95         return;
  96 }
  97
  98 /*
  99  * Because we have ordered buffers being tracked in the AIL for the inode
 100  * creation, we don't need the create item after this. Hence we can free
 101  * the log item and return -1 to tell the caller we're done with the item.
 102  */
 103 STATIC xfs_lsn_t
 104 xfs_icreate_item_committed(
 105         struct xfs_log_item     *lip,
 106         xfs_lsn_t               lsn)
 107 {
 108         struct xfs_icreate_item *icp = ICR_ITEM(lip);
 109
 110         kmem_zone_free(xfs_icreate_zone, icp);
 111         return (xfs_lsn_t)-1;
 112 }
 113
 114 /* item can never get into the AIL */
 115 STATIC uint
 116 xfs_icreate_item_push(
 117         struct xfs_log_item     *lip,
 118         struct list_head        *buffer_list)
 119 {
 120         ASSERT(0);
 121         return XFS_ITEM_SUCCESS;
 122 }
 123
 124 /* Ordered buffers do the dependency tracking here, so this does nothing. */
 125 STATIC void
 126 xfs_icreate_item_committing(
 127         struct xfs_log_item     *lip,
 128         xfs_lsn_t               lsn)
 129 {
 130 }
 131
 132 /*
 133  * This is the ops vector shared by all buf log items.
 134  */
 135 static struct xfs_item_ops xfs_icreate_item_ops = {
 136         .iop_size       = xfs_icreate_item_size,
 137         .iop_format     = xfs_icreate_item_format,
 138         .iop_pin        = xfs_icreate_item_pin,
 139         .iop_unpin      = xfs_icreate_item_unpin,
 140         .iop_push       = xfs_icreate_item_push,
 141         .iop_unlock     = xfs_icreate_item_unlock,
 142         .iop_committed  = xfs_icreate_item_committed,
 143         .iop_committing = xfs_icreate_item_committing,
 144 };
 145
 146
 147 /*
 148  * Initialize the inode log item for a newly allocated (in-core) inode.
 149  *
 150  * Inode extents can only reside within an AG. Hence specify the starting
 151  * block for the inode chunk by offset within an AG as well as the
 152  * length of the allocated extent.
 153  *
 154  * This joins the item to the transaction and marks it dirty so
 155  * that we don't need a separate call to do this, nor does the
 156  * caller need to know anything about the icreate item.
 157  */
 158 void
 159 xfs_icreate_log(
 160         struct xfs_trans        *tp,
 161         xfs_agnumber_t          agno,
 162         xfs_agblock_t           agbno,
 163         unsigned int            count,
 164         unsigned int            inode_size,
 165         xfs_agblock_t           length,
 166         unsigned int            generation)
 167 {
 168         struct xfs_icreate_item *icp;
 169
 170         icp = kmem_zone_zalloc(xfs_icreate_zone, KM_SLEEP);
 171
 172         xfs_log_item_init(tp->t_mountp, &icp->ic_item, XFS_LI_ICREATE,
 173                           &xfs_icreate_item_ops);
 174
 175         icp->ic_format.icl_type = XFS_LI_ICREATE;
 176         icp->ic_format.icl_size = 1;    /* single vector */
 177         icp->ic_format.icl_ag = cpu_to_be32(agno);
 178         icp->ic_format.icl_agbno = cpu_to_be32(agbno);
 179         icp->ic_format.icl_count = cpu_to_be32(count);
 180         icp->ic_format.icl_isize = cpu_to_be32(inode_size);
 181         icp->ic_format.icl_length = cpu_to_be32(length);
 182         icp->ic_format.icl_gen = cpu_to_be32(generation);
 183
 184         xfs_trans_add_item(tp, &icp->ic_item);
 185         tp->t_flags |= XFS_TRANS_DIRTY;
 186         icp->ic_item.li_desc->lid_flags |= XFS_LID_DIRTY;
 187 }