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