fs/xfs/xfs_dquot_item.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright (c) 2000-2003 Silicon Graphics, Inc.
   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_quota.h"
  15 #include "xfs_trans.h"
  16 #include "xfs_buf_item.h"
  17 #include "xfs_trans_priv.h"
  18 #include "xfs_qm.h"
  19 #include "xfs_log.h"
  20
  21 static inline struct xfs_dq_logitem *DQUOT_ITEM(struct xfs_log_item *lip)
  22 {
  23         return container_of(lip, struct xfs_dq_logitem, qli_item);
  24 }
  25
  26 /*
  27  * returns the number of iovecs needed to log the given dquot item.
  28  */
  29 STATIC void
  30 xfs_qm_dquot_logitem_size(
  31         struct xfs_log_item     *lip,
  32         int                     *nvecs,
  33         int                     *nbytes)
  34 {
  35         *nvecs += 2;
  36         *nbytes += sizeof(struct xfs_dq_logformat) +
  37                    sizeof(struct xfs_disk_dquot);
  38 }
  39
  40 /*
  41  * fills in the vector of log iovecs for the given dquot log item.
  42  */
  43 STATIC void
  44 xfs_qm_dquot_logitem_format(
  45         struct xfs_log_item     *lip,
  46         struct xfs_log_vec      *lv)
  47 {
  48         struct xfs_dq_logitem   *qlip = DQUOT_ITEM(lip);
  49         struct xfs_log_iovec    *vecp = NULL;
  50         struct xfs_dq_logformat *qlf;
  51
  52         qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QFORMAT);
  53         qlf->qlf_type = XFS_LI_DQUOT;
  54         qlf->qlf_size = 2;
  55         qlf->qlf_id = be32_to_cpu(qlip->qli_dquot->q_core.d_id);
  56         qlf->qlf_blkno = qlip->qli_dquot->q_blkno;
  57         qlf->qlf_len = 1;
  58         qlf->qlf_boffset = qlip->qli_dquot->q_bufoffset;
  59         xlog_finish_iovec(lv, vecp, sizeof(struct xfs_dq_logformat));
  60
  61         xlog_copy_iovec(lv, &vecp, XLOG_REG_TYPE_DQUOT,
  62                         &qlip->qli_dquot->q_core,
  63                         sizeof(struct xfs_disk_dquot));
  64 }
  65
  66 /*
  67  * Increment the pin count of the given dquot.
  68  */
  69 STATIC void
  70 xfs_qm_dquot_logitem_pin(
  71         struct xfs_log_item     *lip)
  72 {
  73         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
  74
  75         ASSERT(XFS_DQ_IS_LOCKED(dqp));
  76         atomic_inc(&dqp->q_pincount);
  77 }
  78
  79 /*
  80  * Decrement the pin count of the given dquot, and wake up
  81  * anyone in xfs_dqwait_unpin() if the count goes to 0.  The
  82  * dquot must have been previously pinned with a call to
  83  * xfs_qm_dquot_logitem_pin().
  84  */
  85 STATIC void
  86 xfs_qm_dquot_logitem_unpin(
  87         struct xfs_log_item     *lip,
  88         int                     remove)
  89 {
  90         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
  91
  92         ASSERT(atomic_read(&dqp->q_pincount) > 0);
  93         if (atomic_dec_and_test(&dqp->q_pincount))
  94                 wake_up(&dqp->q_pinwait);
  95 }
  96
  97 /*
  98  * This is called to wait for the given dquot to be unpinned.
  99  * Most of these pin/unpin routines are plagiarized from inode code.
 100  */
 101 void
 102 xfs_qm_dqunpin_wait(
 103         struct xfs_dquot        *dqp)
 104 {
 105         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 106         if (atomic_read(&dqp->q_pincount) == 0)
 107                 return;
 108
 109         /*
 110          * Give the log a push so we don't wait here too long.
 111          */
 112         xfs_log_force(dqp->q_mount, 0);
 113         wait_event(dqp->q_pinwait, (atomic_read(&dqp->q_pincount) == 0));
 114 }
 115
 116 /*
 117  * Callback used to mark a buffer with XFS_LI_FAILED when items in the buffer
 118  * have been failed during writeback
 119  *
 120  * this informs the AIL that the dquot is already flush locked on the next push,
 121  * and acquires a hold on the buffer to ensure that it isn't reclaimed before
 122  * dirty data makes it to disk.
 123  */
 124 STATIC void
 125 xfs_dquot_item_error(
 126         struct xfs_log_item     *lip,
 127         struct xfs_buf          *bp)
 128 {
 129         ASSERT(!completion_done(&DQUOT_ITEM(lip)->qli_dquot->q_flush));
 130         xfs_set_li_failed(lip, bp);
 131 }
 132
 133 STATIC uint
 134 xfs_qm_dquot_logitem_push(
 135         struct xfs_log_item     *lip,
 136         struct list_head        *buffer_list)
 137                 __releases(&lip->li_ailp->ail_lock)
 138                 __acquires(&lip->li_ailp->ail_lock)
 139 {
 140         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 141         struct xfs_buf          *bp = lip->li_buf;
 142         uint                    rval = XFS_ITEM_SUCCESS;
 143         int                     error;
 144
 145         if (atomic_read(&dqp->q_pincount) > 0)
 146                 return XFS_ITEM_PINNED;
 147
 148         /*
 149          * The buffer containing this item failed to be written back
 150          * previously. Resubmit the buffer for IO
 151          */
 152         if (test_bit(XFS_LI_FAILED, &lip->li_flags)) {
 153                 if (!xfs_buf_trylock(bp))
 154                         return XFS_ITEM_LOCKED;
 155
 156                 if (!xfs_buf_resubmit_failed_buffers(bp, buffer_list))
 157                         rval = XFS_ITEM_FLUSHING;
 158
 159                 xfs_buf_unlock(bp);
 160                 return rval;
 161         }
 162
 163         if (!xfs_dqlock_nowait(dqp))
 164                 return XFS_ITEM_LOCKED;
 165
 166         /*
 167          * Re-check the pincount now that we stabilized the value by
 168          * taking the quota lock.
 169          */
 170         if (atomic_read(&dqp->q_pincount) > 0) {
 171                 rval = XFS_ITEM_PINNED;
 172                 goto out_unlock;
 173         }
 174
 175         /*
 176          * Someone else is already flushing the dquot.  Nothing we can do
 177          * here but wait for the flush to finish and remove the item from
 178          * the AIL.
 179          */
 180         if (!xfs_dqflock_nowait(dqp)) {
 181                 rval = XFS_ITEM_FLUSHING;
 182                 goto out_unlock;
 183         }
 184
 185         spin_unlock(&lip->li_ailp->ail_lock);
 186
 187         error = xfs_qm_dqflush(dqp, &bp);
 188         if (!error) {
 189                 if (!xfs_buf_delwri_queue(bp, buffer_list))
 190                         rval = XFS_ITEM_FLUSHING;
 191                 xfs_buf_relse(bp);
 192         }
 193
 194         spin_lock(&lip->li_ailp->ail_lock);
 195 out_unlock:
 196         xfs_dqunlock(dqp);
 197         return rval;
 198 }
 199
 200 STATIC void
 201 xfs_qm_dquot_logitem_release(
 202         struct xfs_log_item     *lip)
 203 {
 204         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 205
 206         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 207
 208         /*
 209          * dquots are never 'held' from getting unlocked at the end of
 210          * a transaction.  Their locking and unlocking is hidden inside the
 211          * transaction layer, within trans_commit. Hence, no LI_HOLD flag
 212          * for the logitem.
 213          */
 214         xfs_dqunlock(dqp);
 215 }
 216
 217 STATIC void
 218 xfs_qm_dquot_logitem_committing(
 219         struct xfs_log_item     *lip,
 220         xfs_lsn_t               commit_lsn)
 221 {
 222         return xfs_qm_dquot_logitem_release(lip);
 223 }
 224
 225 static const struct xfs_item_ops xfs_dquot_item_ops = {
 226         .iop_size       = xfs_qm_dquot_logitem_size,
 227         .iop_format     = xfs_qm_dquot_logitem_format,
 228         .iop_pin        = xfs_qm_dquot_logitem_pin,
 229         .iop_unpin      = xfs_qm_dquot_logitem_unpin,
 230         .iop_release    = xfs_qm_dquot_logitem_release,
 231         .iop_committing = xfs_qm_dquot_logitem_committing,
 232         .iop_push       = xfs_qm_dquot_logitem_push,
 233         .iop_error      = xfs_dquot_item_error
 234 };
 235
 236 /*
 237  * Initialize the dquot log item for a newly allocated dquot.
 238  * The dquot isn't locked at this point, but it isn't on any of the lists
 239  * either, so we don't care.
 240  */
 241 void
 242 xfs_qm_dquot_logitem_init(
 243         struct xfs_dquot        *dqp)
 244 {
 245         struct xfs_dq_logitem   *lp = &dqp->q_logitem;
 246
 247         xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
 248                                         &xfs_dquot_item_ops);
 249         lp->qli_dquot = dqp;
 250 }
 251
 252 /*------------------  QUOTAOFF LOG ITEMS  -------------------*/
 253
 254 static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
 255 {
 256         return container_of(lip, struct xfs_qoff_logitem, qql_item);
 257 }
 258
 259
 260 /*
 261  * This returns the number of iovecs needed to log the given quotaoff item.
 262  * We only need 1 iovec for an quotaoff item.  It just logs the
 263  * quotaoff_log_format structure.
 264  */
 265 STATIC void
 266 xfs_qm_qoff_logitem_size(
 267         struct xfs_log_item     *lip,
 268         int                     *nvecs,
 269         int                     *nbytes)
 270 {
 271         *nvecs += 1;
 272         *nbytes += sizeof(struct xfs_qoff_logitem);
 273 }
 274
 275 STATIC void
 276 xfs_qm_qoff_logitem_format(
 277         struct xfs_log_item     *lip,
 278         struct xfs_log_vec      *lv)
 279 {
 280         struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip);
 281         struct xfs_log_iovec    *vecp = NULL;
 282         struct xfs_qoff_logformat *qlf;
 283
 284         qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QUOTAOFF);
 285         qlf->qf_type = XFS_LI_QUOTAOFF;
 286         qlf->qf_size = 1;
 287         qlf->qf_flags = qflip->qql_flags;
 288         xlog_finish_iovec(lv, vecp, sizeof(struct xfs_qoff_logitem));
 289 }
 290
 291 /*
 292  * There isn't much you can do to push a quotaoff item.  It is simply
 293  * stuck waiting for the log to be flushed to disk.
 294  */
 295 STATIC uint
 296 xfs_qm_qoff_logitem_push(
 297         struct xfs_log_item     *lip,
 298         struct list_head        *buffer_list)
 299 {
 300         return XFS_ITEM_LOCKED;
 301 }
 302
 303 STATIC xfs_lsn_t
 304 xfs_qm_qoffend_logitem_committed(
 305         struct xfs_log_item     *lip,
 306         xfs_lsn_t               lsn)
 307 {
 308         struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip);
 309         struct xfs_qoff_logitem *qfs = qfe->qql_start_lip;
 310         struct xfs_ail          *ailp = qfs->qql_item.li_ailp;
 311
 312         /*
 313          * Delete the qoff-start logitem from the AIL.
 314          * xfs_trans_ail_delete() drops the AIL lock.
 315          */
 316         spin_lock(&ailp->ail_lock);
 317         xfs_trans_ail_delete(ailp, &qfs->qql_item, SHUTDOWN_LOG_IO_ERROR);
 318
 319         kmem_free(qfs->qql_item.li_lv_shadow);
 320         kmem_free(lip->li_lv_shadow);
 321         kmem_free(qfs);
 322         kmem_free(qfe);
 323         return (xfs_lsn_t)-1;
 324 }
 325
 326 static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
 327         .iop_size       = xfs_qm_qoff_logitem_size,
 328         .iop_format     = xfs_qm_qoff_logitem_format,
 329         .iop_committed  = xfs_qm_qoffend_logitem_committed,
 330         .iop_push       = xfs_qm_qoff_logitem_push,
 331 };
 332
 333 static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
 334         .iop_size       = xfs_qm_qoff_logitem_size,
 335         .iop_format     = xfs_qm_qoff_logitem_format,
 336         .iop_push       = xfs_qm_qoff_logitem_push,
 337 };
 338
 339 /*
 340  * Allocate and initialize an quotaoff item of the correct quota type(s).
 341  */
 342 struct xfs_qoff_logitem *
 343 xfs_qm_qoff_logitem_init(
 344         struct xfs_mount        *mp,
 345         struct xfs_qoff_logitem *start,
 346         uint                    flags)
 347 {
 348         struct xfs_qoff_logitem *qf;
 349
 350         qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), 0);
 351
 352         xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ?
 353                         &xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops);
 354         qf->qql_item.li_mountp = mp;
 355         qf->qql_start_lip = start;
 356         qf->qql_flags = flags;
 357         return qf;
 358 }