fs/xfs/xfs_icreate_item.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2008-2010, 2013 Dave Chinner
   4  * All Rights Reserved.
   5  */
   6 #include "xfs.h"
   7 #include "xfs_fs.h"
   8 #include "xfs_shared.h"
   9 #include "xfs_format.h"
  10 #include "xfs_log_format.h"
  11 #include "xfs_trans_resv.h"
  12 #include "xfs_mount.h"
  13 #include "xfs_inode.h"
  14 #include "xfs_trans.h"
  15 #include "xfs_trans_priv.h"
  16 #include "xfs_icreate_item.h"
  17 #include "xfs_log.h"
  18 #include "xfs_log_priv.h"
  19 #include "xfs_log_recover.h"
  20 #include "xfs_ialloc.h"
  21 #include "xfs_trace.h"
  22
  23 struct kmem_cache       *xfs_icreate_cache;             /* inode create item */
  24
  25 static inline struct xfs_icreate_item *ICR_ITEM(struct xfs_log_item *lip)
  26 {
  27         return container_of(lip, struct xfs_icreate_item, ic_item);
  28 }
  29
  30 /*
  31  * This returns the number of iovecs needed to log the given inode item.
  32  *
  33  * We only need one iovec for the icreate log structure.
  34  */
  35 STATIC void
  36 xfs_icreate_item_size(
  37         struct xfs_log_item     *lip,
  38         int                     *nvecs,
  39         int                     *nbytes)
  40 {
  41         *nvecs += 1;
  42         *nbytes += sizeof(struct xfs_icreate_log);
  43 }
  44
  45 /*
  46  * This is called to fill in the vector of log iovecs for the
  47  * given inode create log item.
  48  */
  49 STATIC void
  50 xfs_icreate_item_format(
  51         struct xfs_log_item     *lip,
  52         struct xfs_log_vec      *lv)
  53 {
  54         struct xfs_icreate_item *icp = ICR_ITEM(lip);
  55         struct xfs_log_iovec    *vecp = NULL;
  56
  57         xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_ICREATE,
  58                         &icp->ic_format,
  59                         sizeof(struct xfs_icreate_log));
  60 }
  61
  62 STATIC void
  63 xfs_icreate_item_release(
  64         struct xfs_log_item     *lip)
  65 {
  66         kvfree(ICR_ITEM(lip)->ic_item.li_lv_shadow);
  67         kmem_cache_free(xfs_icreate_cache, ICR_ITEM(lip));
  68 }
  69
  70 static const struct xfs_item_ops xfs_icreate_item_ops = {
  71         .flags          = XFS_ITEM_RELEASE_WHEN_COMMITTED,
  72         .iop_size       = xfs_icreate_item_size,
  73         .iop_format     = xfs_icreate_item_format,
  74         .iop_release    = xfs_icreate_item_release,
  75 };
  76
  77
  78 /*
  79  * Initialize the inode log item for a newly allocated (in-core) inode.
  80  *
  81  * Inode extents can only reside within an AG. Hence specify the starting
  82  * block for the inode chunk by offset within an AG as well as the
  83  * length of the allocated extent.
  84  *
  85  * This joins the item to the transaction and marks it dirty so
  86  * that we don't need a separate call to do this, nor does the
  87  * caller need to know anything about the icreate item.
  88  */
  89 void
  90 xfs_icreate_log(
  91         struct xfs_trans        *tp,
  92         xfs_agnumber_t          agno,
  93         xfs_agblock_t           agbno,
  94         unsigned int            count,
  95         unsigned int            inode_size,
  96         xfs_agblock_t           length,
  97         unsigned int            generation)
  98 {
  99         struct xfs_icreate_item *icp;
 100
 101         icp = kmem_cache_zalloc(xfs_icreate_cache, GFP_KERNEL | __GFP_NOFAIL);
 102
 103         xfs_log_item_init(tp->t_mountp, &icp->ic_item, XFS_LI_ICREATE,
 104                           &xfs_icreate_item_ops);
 105
 106         icp->ic_format.icl_type = XFS_LI_ICREATE;
 107         icp->ic_format.icl_size = 1;    /* single vector */
 108         icp->ic_format.icl_ag = cpu_to_be32(agno);
 109         icp->ic_format.icl_agbno = cpu_to_be32(agbno);
 110         icp->ic_format.icl_count = cpu_to_be32(count);
 111         icp->ic_format.icl_isize = cpu_to_be32(inode_size);
 112         icp->ic_format.icl_length = cpu_to_be32(length);
 113         icp->ic_format.icl_gen = cpu_to_be32(generation);
 114
 115         xfs_trans_add_item(tp, &icp->ic_item);
 116         tp->t_flags |= XFS_TRANS_DIRTY;
 117         set_bit(XFS_LI_DIRTY, &icp->ic_item.li_flags);
 118 }
 119
 120 static enum xlog_recover_reorder
 121 xlog_recover_icreate_reorder(
 122                 struct xlog_recover_item *item)
 123 {
 124         /*
 125          * Inode allocation buffers must be replayed before subsequent inode
 126          * items try to modify those buffers.  ICREATE items are the logical
 127          * equivalent of logging a newly initialized inode buffer, so recover
 128          * these at the same time that we recover logged buffers.
 129          */
 130         return XLOG_REORDER_BUFFER_LIST;
 131 }
 132
 133 /*
 134  * This routine is called when an inode create format structure is found in a
 135  * committed transaction in the log.  It's purpose is to initialise the inodes
 136  * being allocated on disk. This requires us to get inode cluster buffers that
 137  * match the range to be initialised, stamped with inode templates and written
 138  * by delayed write so that subsequent modifications will hit the cached buffer
 139  * and only need writing out at the end of recovery.
 140  */
 141 STATIC int
 142 xlog_recover_icreate_commit_pass2(
 143         struct xlog                     *log,
 144         struct list_head                *buffer_list,
 145         struct xlog_recover_item        *item,
 146         xfs_lsn_t                       lsn)
 147 {
 148         struct xfs_mount                *mp = log->l_mp;
 149         struct xfs_icreate_log          *icl;
 150         struct xfs_ino_geometry         *igeo = M_IGEO(mp);
 151         xfs_agnumber_t                  agno;
 152         xfs_agblock_t                   agbno;
 153         unsigned int                    count;
 154         unsigned int                    isize;
 155         xfs_agblock_t                   length;
 156         int                             bb_per_cluster;
 157         int                             cancel_count;
 158         int                             nbufs;
 159         int                             i;
 160
 161         icl = (struct xfs_icreate_log *)item->ri_buf[0].i_addr;
 162         if (icl->icl_type != XFS_LI_ICREATE) {
 163                 xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad type");
 164                 return -EINVAL;
 165         }
 166
 167         if (icl->icl_size != 1) {
 168                 xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad icl size");
 169                 return -EINVAL;
 170         }
 171
 172         agno = be32_to_cpu(icl->icl_ag);
 173         if (agno >= mp->m_sb.sb_agcount) {
 174                 xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad agno");
 175                 return -EINVAL;
 176         }
 177         agbno = be32_to_cpu(icl->icl_agbno);
 178         if (!agbno || agbno == NULLAGBLOCK || agbno >= mp->m_sb.sb_agblocks) {
 179                 xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad agbno");
 180                 return -EINVAL;
 181         }
 182         isize = be32_to_cpu(icl->icl_isize);
 183         if (isize != mp->m_sb.sb_inodesize) {
 184                 xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad isize");
 185                 return -EINVAL;
 186         }
 187         count = be32_to_cpu(icl->icl_count);
 188         if (!count) {
 189                 xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad count");
 190                 return -EINVAL;
 191         }
 192         length = be32_to_cpu(icl->icl_length);
 193         if (!length || length >= mp->m_sb.sb_agblocks) {
 194                 xfs_warn(log->l_mp, "xlog_recover_do_icreate_trans: bad length");
 195                 return -EINVAL;
 196         }
 197
 198         /*
 199          * The inode chunk is either full or sparse and we only support
 200          * m_ino_geo.ialloc_min_blks sized sparse allocations at this time.
 201          */
 202         if (length != igeo->ialloc_blks &&
 203             length != igeo->ialloc_min_blks) {
 204                 xfs_warn(log->l_mp,
 205                          "%s: unsupported chunk length", __func__);
 206                 return -EINVAL;
 207         }
 208
 209         /* verify inode count is consistent with extent length */
 210         if ((count >> mp->m_sb.sb_inopblog) != length) {
 211                 xfs_warn(log->l_mp,
 212                          "%s: inconsistent inode count and chunk length",
 213                          __func__);
 214                 return -EINVAL;
 215         }
 216
 217         /*
 218          * The icreate transaction can cover multiple cluster buffers and these
 219          * buffers could have been freed and reused. Check the individual
 220          * buffers for cancellation so we don't overwrite anything written after
 221          * a cancellation.
 222          */
 223         bb_per_cluster = XFS_FSB_TO_BB(mp, igeo->blocks_per_cluster);
 224         nbufs = length / igeo->blocks_per_cluster;
 225         for (i = 0, cancel_count = 0; i < nbufs; i++) {
 226                 xfs_daddr_t     daddr;
 227
 228                 daddr = XFS_AGB_TO_DADDR(mp, agno,
 229                                 agbno + i * igeo->blocks_per_cluster);
 230                 if (xlog_is_buffer_cancelled(log, daddr, bb_per_cluster))
 231                         cancel_count++;
 232         }
 233
 234         /*
 235          * We currently only use icreate for a single allocation at a time. This
 236          * means we should expect either all or none of the buffers to be
 237          * cancelled. Be conservative and skip replay if at least one buffer is
 238          * cancelled, but warn the user that something is awry if the buffers
 239          * are not consistent.
 240          *
 241          * XXX: This must be refined to only skip cancelled clusters once we use
 242          * icreate for multiple chunk allocations.
 243          */
 244         ASSERT(!cancel_count || cancel_count == nbufs);
 245         if (cancel_count) {
 246                 if (cancel_count != nbufs)
 247                         xfs_warn(mp,
 248         "WARNING: partial inode chunk cancellation, skipped icreate.");
 249                 trace_xfs_log_recover_icreate_cancel(log, icl);
 250                 return 0;
 251         }
 252
 253         trace_xfs_log_recover_icreate_recover(log, icl);
 254         return xfs_ialloc_inode_init(mp, NULL, buffer_list, count, agno, agbno,
 255                                      length, be32_to_cpu(icl->icl_gen));
 256 }
 257
 258 const struct xlog_recover_item_ops xlog_icreate_item_ops = {
 259         .item_type              = XFS_LI_ICREATE,
 260         .reorder                = xlog_recover_icreate_reorder,
 261         .commit_pass2           = xlog_recover_icreate_commit_pass2,
 262 };