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 STATIC uint
 117 xfs_qm_dquot_logitem_push(
 118         struct xfs_log_item     *lip,
 119         struct list_head        *buffer_list)
 120                 __releases(&lip->li_ailp->ail_lock)
 121                 __acquires(&lip->li_ailp->ail_lock)
 122 {
 123         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 124         struct xfs_buf          *bp = lip->li_buf;
 125         uint                    rval = XFS_ITEM_SUCCESS;
 126         int                     error;
 127
 128         if (atomic_read(&dqp->q_pincount) > 0)
 129                 return XFS_ITEM_PINNED;
 130
 131         if (!xfs_dqlock_nowait(dqp))
 132                 return XFS_ITEM_LOCKED;
 133
 134         /*
 135          * Re-check the pincount now that we stabilized the value by
 136          * taking the quota lock.
 137          */
 138         if (atomic_read(&dqp->q_pincount) > 0) {
 139                 rval = XFS_ITEM_PINNED;
 140                 goto out_unlock;
 141         }
 142
 143         /*
 144          * Someone else is already flushing the dquot.  Nothing we can do
 145          * here but wait for the flush to finish and remove the item from
 146          * the AIL.
 147          */
 148         if (!xfs_dqflock_nowait(dqp)) {
 149                 rval = XFS_ITEM_FLUSHING;
 150                 goto out_unlock;
 151         }
 152
 153         spin_unlock(&lip->li_ailp->ail_lock);
 154
 155         error = xfs_qm_dqflush(dqp, &bp);
 156         if (!error) {
 157                 if (!xfs_buf_delwri_queue(bp, buffer_list))
 158                         rval = XFS_ITEM_FLUSHING;
 159                 xfs_buf_relse(bp);
 160         } else if (error == -EAGAIN)
 161                 rval = XFS_ITEM_LOCKED;
 162
 163         spin_lock(&lip->li_ailp->ail_lock);
 164 out_unlock:
 165         xfs_dqunlock(dqp);
 166         return rval;
 167 }
 168
 169 STATIC void
 170 xfs_qm_dquot_logitem_release(
 171         struct xfs_log_item     *lip)
 172 {
 173         struct xfs_dquot        *dqp = DQUOT_ITEM(lip)->qli_dquot;
 174
 175         ASSERT(XFS_DQ_IS_LOCKED(dqp));
 176
 177         /*
 178          * dquots are never 'held' from getting unlocked at the end of
 179          * a transaction.  Their locking and unlocking is hidden inside the
 180          * transaction layer, within trans_commit. Hence, no LI_HOLD flag
 181          * for the logitem.
 182          */
 183         xfs_dqunlock(dqp);
 184 }
 185
 186 STATIC void
 187 xfs_qm_dquot_logitem_committing(
 188         struct xfs_log_item     *lip,
 189         xfs_lsn_t               commit_lsn)
 190 {
 191         return xfs_qm_dquot_logitem_release(lip);
 192 }
 193
 194 static const struct xfs_item_ops xfs_dquot_item_ops = {
 195         .iop_size       = xfs_qm_dquot_logitem_size,
 196         .iop_format     = xfs_qm_dquot_logitem_format,
 197         .iop_pin        = xfs_qm_dquot_logitem_pin,
 198         .iop_unpin      = xfs_qm_dquot_logitem_unpin,
 199         .iop_release    = xfs_qm_dquot_logitem_release,
 200         .iop_committing = xfs_qm_dquot_logitem_committing,
 201         .iop_push       = xfs_qm_dquot_logitem_push,
 202 };
 203
 204 /*
 205  * Initialize the dquot log item for a newly allocated dquot.
 206  * The dquot isn't locked at this point, but it isn't on any of the lists
 207  * either, so we don't care.
 208  */
 209 void
 210 xfs_qm_dquot_logitem_init(
 211         struct xfs_dquot        *dqp)
 212 {
 213         struct xfs_dq_logitem   *lp = &dqp->q_logitem;
 214
 215         xfs_log_item_init(dqp->q_mount, &lp->qli_item, XFS_LI_DQUOT,
 216                                         &xfs_dquot_item_ops);
 217         lp->qli_dquot = dqp;
 218 }
 219
 220 /*------------------  QUOTAOFF LOG ITEMS  -------------------*/
 221
 222 static inline struct xfs_qoff_logitem *QOFF_ITEM(struct xfs_log_item *lip)
 223 {
 224         return container_of(lip, struct xfs_qoff_logitem, qql_item);
 225 }
 226
 227
 228 /*
 229  * This returns the number of iovecs needed to log the given quotaoff item.
 230  * We only need 1 iovec for an quotaoff item.  It just logs the
 231  * quotaoff_log_format structure.
 232  */
 233 STATIC void
 234 xfs_qm_qoff_logitem_size(
 235         struct xfs_log_item     *lip,
 236         int                     *nvecs,
 237         int                     *nbytes)
 238 {
 239         *nvecs += 1;
 240         *nbytes += sizeof(struct xfs_qoff_logitem);
 241 }
 242
 243 STATIC void
 244 xfs_qm_qoff_logitem_format(
 245         struct xfs_log_item     *lip,
 246         struct xfs_log_vec      *lv)
 247 {
 248         struct xfs_qoff_logitem *qflip = QOFF_ITEM(lip);
 249         struct xfs_log_iovec    *vecp = NULL;
 250         struct xfs_qoff_logformat *qlf;
 251
 252         qlf = xlog_prepare_iovec(lv, &vecp, XLOG_REG_TYPE_QUOTAOFF);
 253         qlf->qf_type = XFS_LI_QUOTAOFF;
 254         qlf->qf_size = 1;
 255         qlf->qf_flags = qflip->qql_flags;
 256         xlog_finish_iovec(lv, vecp, sizeof(struct xfs_qoff_logitem));
 257 }
 258
 259 /*
 260  * There isn't much you can do to push a quotaoff item.  It is simply
 261  * stuck waiting for the log to be flushed to disk.
 262  */
 263 STATIC uint
 264 xfs_qm_qoff_logitem_push(
 265         struct xfs_log_item     *lip,
 266         struct list_head        *buffer_list)
 267 {
 268         return XFS_ITEM_LOCKED;
 269 }
 270
 271 STATIC xfs_lsn_t
 272 xfs_qm_qoffend_logitem_committed(
 273         struct xfs_log_item     *lip,
 274         xfs_lsn_t               lsn)
 275 {
 276         struct xfs_qoff_logitem *qfe = QOFF_ITEM(lip);
 277         struct xfs_qoff_logitem *qfs = qfe->qql_start_lip;
 278
 279         xfs_qm_qoff_logitem_relse(qfs);
 280
 281         kmem_free(lip->li_lv_shadow);
 282         kmem_free(qfe);
 283         return (xfs_lsn_t)-1;
 284 }
 285
 286 STATIC void
 287 xfs_qm_qoff_logitem_release(
 288         struct xfs_log_item     *lip)
 289 {
 290         struct xfs_qoff_logitem *qoff = QOFF_ITEM(lip);
 291
 292         if (test_bit(XFS_LI_ABORTED, &lip->li_flags)) {
 293                 if (qoff->qql_start_lip)
 294                         xfs_qm_qoff_logitem_relse(qoff->qql_start_lip);
 295                 xfs_qm_qoff_logitem_relse(qoff);
 296         }
 297 }
 298
 299 static const struct xfs_item_ops xfs_qm_qoffend_logitem_ops = {
 300         .iop_size       = xfs_qm_qoff_logitem_size,
 301         .iop_format     = xfs_qm_qoff_logitem_format,
 302         .iop_committed  = xfs_qm_qoffend_logitem_committed,
 303         .iop_push       = xfs_qm_qoff_logitem_push,
 304         .iop_release    = xfs_qm_qoff_logitem_release,
 305 };
 306
 307 static const struct xfs_item_ops xfs_qm_qoff_logitem_ops = {
 308         .iop_size       = xfs_qm_qoff_logitem_size,
 309         .iop_format     = xfs_qm_qoff_logitem_format,
 310         .iop_push       = xfs_qm_qoff_logitem_push,
 311         .iop_release    = xfs_qm_qoff_logitem_release,
 312 };
 313
 314 /*
 315  * Delete the quotaoff intent from the AIL and free it. On success,
 316  * this should only be called for the start item. It can be used for
 317  * either on shutdown or abort.
 318  */
 319 void
 320 xfs_qm_qoff_logitem_relse(
 321         struct xfs_qoff_logitem *qoff)
 322 {
 323         struct xfs_log_item     *lip = &qoff->qql_item;
 324
 325         ASSERT(test_bit(XFS_LI_IN_AIL, &lip->li_flags) ||
 326                test_bit(XFS_LI_ABORTED, &lip->li_flags) ||
 327                XFS_FORCED_SHUTDOWN(lip->li_mountp));
 328         xfs_trans_ail_delete(lip, 0);
 329         kmem_free(lip->li_lv_shadow);
 330         kmem_free(qoff);
 331 }
 332
 333 /*
 334  * Allocate and initialize an quotaoff item of the correct quota type(s).
 335  */
 336 struct xfs_qoff_logitem *
 337 xfs_qm_qoff_logitem_init(
 338         struct xfs_mount        *mp,
 339         struct xfs_qoff_logitem *start,
 340         uint                    flags)
 341 {
 342         struct xfs_qoff_logitem *qf;
 343
 344         qf = kmem_zalloc(sizeof(struct xfs_qoff_logitem), 0);
 345
 346         xfs_log_item_init(mp, &qf->qql_item, XFS_LI_QUOTAOFF, start ?
 347                         &xfs_qm_qoffend_logitem_ops : &xfs_qm_qoff_logitem_ops);
 348         qf->qql_item.li_mountp = mp;
 349         qf->qql_start_lip = start;
 350         qf->qql_flags = flags;
 351         return qf;
 352 }