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