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