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 #include "xfs_log.h"
  32
  33 kmem_zone_t     *xfs_icreate_zone;              /* inode create item zone */
  34
  35 static inline struct xfs_icreate_item *ICR_ITEM(struct xfs_log_item *lip)
  36 {
  37         return container_of(lip, struct xfs_icreate_item, ic_item);
  38 }
  39
  40 /*
  41  * This returns the number of iovecs needed to log the given inode item.
  42  *
  43  * We only need one iovec for the icreate log structure.
  44  */
  45 STATIC void
  46 xfs_icreate_item_size(
  47         struct xfs_log_item     *lip,
  48         int                     *nvecs,
  49         int                     *nbytes)
  50 {
  51         *nvecs += 1;
  52         *nbytes += sizeof(struct xfs_icreate_log);
  53 }
  54
  55 /*
  56  * This is called to fill in the vector of log iovecs for the
  57  * given inode create log item.
  58  */
  59 STATIC void
  60 xfs_icreate_item_format(
  61         struct xfs_log_item     *lip,
  62         struct xfs_log_vec      *lv)
  63 {
  64         struct xfs_icreate_item *icp = ICR_ITEM(lip);
  65         struct xfs_log_iovec    *vecp = NULL;
  66
  67         xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ICREATE,
  68                         &icp->ic_format,
  69                         sizeof(struct xfs_icreate_log));
  70 }
  71
  72
  73 /* Pinning has no meaning for the create item, so just return. */
  74 STATIC void
  75 xfs_icreate_item_pin(
  76         struct xfs_log_item     *lip)
  77 {
  78 }
  79
  80
  81 /* pinning has no meaning for the create item, so just return. */
  82 STATIC void
  83 xfs_icreate_item_unpin(
  84         struct xfs_log_item     *lip,
  85         int                     remove)
  86 {
  87 }
  88
  89 STATIC void
  90 xfs_icreate_item_unlock(
  91         struct xfs_log_item     *lip)
  92 {
  93         struct xfs_icreate_item *icp = ICR_ITEM(lip);
  94
  95         if (icp->ic_item.li_flags & XFS_LI_ABORTED)
  96                 kmem_zone_free(xfs_icreate_zone, icp);
  97         return;
  98 }
  99
 100 /*
 101  * Because we have ordered buffers being tracked in the AIL for the inode
 102  * creation, we don't need the create item after this. Hence we can free
 103  * the log item and return -1 to tell the caller we're done with the item.
 104  */
 105 STATIC xfs_lsn_t
 106 xfs_icreate_item_committed(
 107         struct xfs_log_item     *lip,
 108         xfs_lsn_t               lsn)
 109 {
 110         struct xfs_icreate_item *icp = ICR_ITEM(lip);
 111
 112         kmem_zone_free(xfs_icreate_zone, icp);
 113         return (xfs_lsn_t)-1;
 114 }
 115
 116 /* item can never get into the AIL */
 117 STATIC uint
 118 xfs_icreate_item_push(
 119         struct xfs_log_item     *lip,
 120         struct list_head        *buffer_list)
 121 {
 122         ASSERT(0);
 123         return XFS_ITEM_SUCCESS;
 124 }
 125
 126 /* Ordered buffers do the dependency tracking here, so this does nothing. */
 127 STATIC void
 128 xfs_icreate_item_committing(
 129         struct xfs_log_item     *lip,
 130         xfs_lsn_t               lsn)
 131 {
 132 }
 133
 134 /*
 135  * This is the ops vector shared by all buf log items.
 136  */
 137 static struct xfs_item_ops xfs_icreate_item_ops = {
 138         .iop_size       = xfs_icreate_item_size,
 139         .iop_format     = xfs_icreate_item_format,
 140         .iop_pin        = xfs_icreate_item_pin,
 141         .iop_unpin      = xfs_icreate_item_unpin,
 142         .iop_push       = xfs_icreate_item_push,
 143         .iop_unlock     = xfs_icreate_item_unlock,
 144         .iop_committed  = xfs_icreate_item_committed,
 145         .iop_committing = xfs_icreate_item_committing,
 146 };
 147
 148
 149 /*
 150  * Initialize the inode log item for a newly allocated (in-core) inode.
 151  *
 152  * Inode extents can only reside within an AG. Hence specify the starting
 153  * block for the inode chunk by offset within an AG as well as the
 154  * length of the allocated extent.
 155  *
 156  * This joins the item to the transaction and marks it dirty so
 157  * that we don't need a separate call to do this, nor does the
 158  * caller need to know anything about the icreate item.
 159  */
 160 void
 161 xfs_icreate_log(
 162         struct xfs_trans        *tp,
 163         xfs_agnumber_t          agno,
 164         xfs_agblock_t           agbno,
 165         unsigned int            count,
 166         unsigned int            inode_size,
 167         xfs_agblock_t           length,
 168         unsigned int            generation)
 169 {
 170         struct xfs_icreate_item *icp;
 171
 172         icp = kmem_zone_zalloc(xfs_icreate_zone, KM_SLEEP);
 173
 174         xfs_log_item_init(tp->t_mountp, &icp->ic_item, XFS_LI_ICREATE,
 175                           &xfs_icreate_item_ops);
 176
 177         icp->ic_format.icl_type = XFS_LI_ICREATE;
 178         icp->ic_format.icl_size = 1;    /* single vector */
 179         icp->ic_format.icl_ag = cpu_to_be32(agno);
 180         icp->ic_format.icl_agbno = cpu_to_be32(agbno);
 181         icp->ic_format.icl_count = cpu_to_be32(count);
 182         icp->ic_format.icl_isize = cpu_to_be32(inode_size);
 183         icp->ic_format.icl_length = cpu_to_be32(length);
 184         icp->ic_format.icl_gen = cpu_to_be32(generation);
 185
 186         xfs_trans_add_item(tp, &icp->ic_item);
 187         tp->t_flags |= XFS_TRANS_DIRTY;
 188         icp->ic_item.li_desc->lid_flags |= XFS_LID_DIRTY;
 189 }