/*
* Copyright (c) 2000-2003,2005 Silicon Graphics, Inc.
* All Rights Reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License as
* published by the Free Software Foundation.
*
* This program is distributed in the hope that it would be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_types.h"
#include "xfs_bit.h"
#include "xfs_log.h"
#include "xfs_inum.h"
#include "xfs_trans.h"
#include "xfs_sb.h"
#include "xfs_ag.h"
#include "xfs_dir2.h"
#include "xfs_dmapi.h"
#include "xfs_mount.h"
#include "xfs_error.h"
#include "xfs_da_btree.h"
#include "xfs_bmap_btree.h"
#include "xfs_alloc_btree.h"
#include "xfs_ialloc_btree.h"
#include "xfs_dir2_sf.h"
#include "xfs_attr_sf.h"
#include "xfs_dinode.h"
#include "xfs_inode.h"
#include "xfs_btree.h"
#include "xfs_ialloc.h"
#include "xfs_alloc.h"
#include "xfs_bmap.h"
#include "xfs_quota.h"
#include "xfs_trans_priv.h"
#include "xfs_trans_space.h"
STATIC void xfs_trans_apply_sb_deltas(xfs_trans_t *);
STATIC uint xfs_trans_count_vecs(xfs_trans_t *);
STATIC void xfs_trans_fill_vecs(xfs_trans_t *, xfs_log_iovec_t *);
STATIC void xfs_trans_uncommit(xfs_trans_t *, uint);
STATIC void xfs_trans_committed(xfs_trans_t *, int);
STATIC void xfs_trans_chunk_committed(xfs_log_item_chunk_t *, xfs_lsn_t, int);
STATIC void xfs_trans_free(xfs_trans_t *);
kmem_zone_t *xfs_trans_zone;
/*
* Reservation functions here avoid a huge stack in xfs_trans_init
* due to register overflow from temporaries in the calculations.
*/
STATIC uint
xfs_calc_write_reservation(xfs_mount_t *mp)
{
return XFS_CALC_WRITE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
}
STATIC uint
xfs_calc_itruncate_reservation(xfs_mount_t *mp)
{
return XFS_CALC_ITRUNCATE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
}
STATIC uint
xfs_calc_rename_reservation(xfs_mount_t *mp)
{
return XFS_CALC_RENAME_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
}
STATIC uint
xfs_calc_link_reservation(xfs_mount_t *mp)
{
return XFS_CALC_LINK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
}
STATIC uint
xfs_calc_remove_reservation(xfs_mount_t *mp)
{
return XFS_CALC_REMOVE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
}
STATIC uint
xfs_calc_symlink_reservation(xfs_mount_t *mp)
{
return XFS_CALC_SYMLINK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
}
STATIC uint
xfs_calc_create_reservation(xfs_mount_t *mp)
{
return XFS_CALC_CREATE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
}
STATIC uint
xfs_calc_mkdir_reservation(xfs_mount_t *mp)
{
return XFS_CALC_MKDIR_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
}
STATIC uint
xfs_calc_ifree_reservation(xfs_mount_t *mp)
{
return XFS_CALC_IFREE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
}
STATIC uint
xfs_calc_ichange_reservation(xfs_mount_t *mp)
{
return XFS_CALC_ICHANGE_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
}
STATIC uint
xfs_calc_growdata_reservation(xfs_mount_t *mp)
{
return XFS_CALC_GROWDATA_LOG_RES(mp);
}
STATIC uint
xfs_calc_growrtalloc_reservation(xfs_mount_t *mp)
{
return XFS_CALC_GROWRTALLOC_LOG_RES(mp);
}
STATIC uint
xfs_calc_growrtzero_reservation(xfs_mount_t *mp)
{
return XFS_CALC_GROWRTZERO_LOG_RES(mp);
}
STATIC uint
xfs_calc_growrtfree_reservation(xfs_mount_t *mp)
{
return XFS_CALC_GROWRTFREE_LOG_RES(mp);
}
STATIC uint
xfs_calc_swrite_reservation(xfs_mount_t *mp)
{
return XFS_CALC_SWRITE_LOG_RES(mp);
}
STATIC uint
xfs_calc_writeid_reservation(xfs_mount_t *mp)
{
return XFS_CALC_WRITEID_LOG_RES(mp);
}
STATIC uint
xfs_calc_addafork_reservation(xfs_mount_t *mp)
{
return XFS_CALC_ADDAFORK_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
}
STATIC uint
xfs_calc_attrinval_reservation(xfs_mount_t *mp)
{
return XFS_CALC_ATTRINVAL_LOG_RES(mp);
}
STATIC uint
xfs_calc_attrset_reservation(xfs_mount_t *mp)
{
return XFS_CALC_ATTRSET_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
}
STATIC uint
xfs_calc_attrrm_reservation(xfs_mount_t *mp)
{
return XFS_CALC_ATTRRM_LOG_RES(mp) + XFS_DQUOT_LOGRES(mp);
}
STATIC uint
xfs_calc_clear_agi_bucket_reservation(xfs_mount_t *mp)
{
return XFS_CALC_CLEAR_AGI_BUCKET_LOG_RES(mp);
}
/*
* Initialize the precomputed transaction reservation values
* in the mount structure.
*/
void
xfs_trans_init(
xfs_mount_t *mp)
{
xfs_trans_reservations_t *resp;
resp = &(mp->m_reservations);
resp->tr_write = xfs_calc_write_reservation(mp);
resp->tr_itruncate = xfs_calc_itruncate_reservation(mp);
resp->tr_rename = xfs_calc_rename_reservation(mp);
resp->tr_link = xfs_calc_link_reservation(mp);
resp->tr_remove = xfs_calc_remove_reservation(mp);
resp->tr_symlink = xfs_calc_symlink_reservation(mp);
resp->tr_create = xfs_calc_create_reservation(mp);
resp->tr_mkdir = xfs_calc_mkdir_reservation(mp);
resp->tr_ifree = xfs_calc_ifree_reservation(mp);
resp->tr_ichange = xfs_calc_ichange_reservation(mp);
resp->tr_growdata = xfs_calc_growdata_reservation(mp);
resp->tr_swrite = xfs_calc_swrite_reservation(mp);
resp->tr_writeid = xfs_calc_writeid_reservation(mp);
resp->tr_addafork = xfs_calc_addafork_reservation(mp);
resp->tr_attrinval = xfs_calc_attrinval_reservation(mp);
resp->tr_attrset = xfs_calc_attrset_reservation(mp);
resp->tr_attrrm = xfs_calc_attrrm_reservation(mp);
resp->tr_clearagi = xfs_calc_clear_agi_bucket_reservation(mp);
resp->tr_growrtalloc = xfs_calc_growrtalloc_reservation(mp);
resp->tr_growrtzero = xfs_calc_growrtzero_reservation(mp);
resp->tr_growrtfree = xfs_calc_growrtfree_reservation(mp);
}
/*
* This routine is called to allocate a transaction structure.
* The type parameter indicates the type of the transaction. These
* are enumerated in xfs_trans.h.
*
* Dynamically allocate the transaction structure from the transaction
* zone, initialize it, and return it to the caller.
*/
xfs_trans_t *
xfs_trans_alloc(
xfs_mount_t *mp,
uint type)
{
xfs_wait_for_freeze(mp, SB_FREEZE_TRANS);
return _xfs_trans_alloc(mp, type);
}
xfs_trans_t *
_xfs_trans_alloc(
xfs_mount_t *mp,
uint type)
{
xfs_trans_t *tp;
atomic_inc(&mp->m_active_trans);
tp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
tp->t_magic = XFS_TRANS_MAGIC;
tp->t_type = type;
tp->t_mountp = mp;
tp->t_items_free = XFS_LIC_NUM_SLOTS;
tp->t_busy_free = XFS_LBC_NUM_SLOTS;
XFS_LIC_INIT(&(tp->t_items));
XFS_LBC_INIT(&(tp->t_busy));
return tp;
}
/*
* This is called to create a new transaction which will share the
* permanent log reservation of the given transaction. The remaining
* unused block and rt extent reservations are also inherited. This
* implies that the original transaction is no longer allowed to allocate
* blocks. Locks and log items, however, are no inherited. They must
* be added to the new transaction explicitly.
*/
xfs_trans_t *
xfs_trans_dup(
xfs_trans_t *tp)
{
xfs_trans_t *ntp;
ntp = kmem_zone_zalloc(xfs_trans_zone, KM_SLEEP);
/*
* Initialize the new transaction structure.
*/
ntp->t_magic = XFS_TRANS_MAGIC;
ntp->t_type = tp->t_type;
ntp->t_mountp = tp->t_mountp;
ntp->t_items_free = XFS_LIC_NUM_SLOTS;
ntp->t_busy_free = XFS_LBC_NUM_SLOTS;
XFS_LIC_INIT(&(ntp->t_items));
XFS_LBC_INIT(&(ntp->t_busy));
ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
ASSERT(tp->t_ticket != NULL);
ntp->t_flags = XFS_TRANS_PERM_LOG_RES | (tp->t_flags & XFS_TRANS_RESERVE);
ntp->t_ticket = tp->t_ticket;
ntp->t_blk_res = tp->t_blk_res - tp->t_blk_res_used;
tp->t_blk_res = tp->t_blk_res_used;
ntp->t_rtx_res = tp->t_rtx_res - tp->t_rtx_res_used;
tp->t_rtx_res = tp->t_rtx_res_used;
ntp->t_pflags = tp->t_pflags;
XFS_TRANS_DUP_DQINFO(tp->t_mountp, tp, ntp);
atomic_inc(&tp->t_mountp->m_active_trans);
return ntp;
}
/*
* This is called to reserve free disk blocks and log space for the
* given transaction. This must be done before allocating any resources
* within the transaction.
*
* This will return ENOSPC if there are not enough blocks available.
* It will sleep waiting for available log space.
* The only valid value for the flags parameter is XFS_RES_LOG_PERM, which
* is used by long running transactions. If any one of the reservations
* fails then they will all be backed out.
*
* This does not do quota reservations. That typically is done by the
* caller afterwards.
*/
int
xfs_trans_reserve(
xfs_trans_t *tp,
uint blocks,
uint logspace,
uint rtextents,
uint flags,
uint logcount)
{
int log_flags;
int error = 0;
int rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
/* Mark this thread as being in a transaction */
current_set_flags_nested(&tp->t_pflags, PF_FSTRANS);
/*
* Attempt to reserve the needed disk blocks by decrementing
* the number needed from the number available. This will
* fail if the count would go below zero.
*/
if (blocks > 0) {
error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FDBLOCKS,
-((int64_t)blocks), rsvd);
if (error != 0) {
current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
return (XFS_ERROR(ENOSPC));
}
tp->t_blk_res += blocks;
}
/*
* Reserve the log space needed for this transaction.
*/
if (logspace > 0) {
ASSERT((tp->t_log_res == 0) || (tp->t_log_res == logspace));
ASSERT((tp->t_log_count == 0) ||
(tp->t_log_count == logcount));
if (flags & XFS_TRANS_PERM_LOG_RES) {
log_flags = XFS_LOG_PERM_RESERV;
tp->t_flags |= XFS_TRANS_PERM_LOG_RES;
} else {
ASSERT(tp->t_ticket == NULL);
ASSERT(!(tp->t_flags & XFS_TRANS_PERM_LOG_RES));
log_flags = 0;
}
error = xfs_log_reserve(tp->t_mountp, logspace, logcount,
&tp->t_ticket,
XFS_TRANSACTION, log_flags, tp->t_type);
if (error) {
goto undo_blocks;
}
tp->t_log_res = logspace;
tp->t_log_count = logcount;
}
/*
* Attempt to reserve the needed realtime extents by decrementing
* the number needed from the number available. This will
* fail if the count would go below zero.
*/
if (rtextents > 0) {
error = xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FREXTENTS,
-((int64_t)rtextents), rsvd);
if (error) {
error = XFS_ERROR(ENOSPC);
goto undo_log;
}
tp->t_rtx_res += rtextents;
}
return 0;
/*
* Error cases jump to one of these labels to undo any
* reservations which have already been performed.
*/
undo_log:
if (logspace > 0) {
if (flags & XFS_TRANS_PERM_LOG_RES) {
log_flags = XFS_LOG_REL_PERM_RESERV;
} else {
log_flags = 0;
}
xfs_log_done(tp->t_mountp, tp->t_ticket, NULL, log_flags);
tp->t_ticket = NULL;
tp->t_log_res = 0;
tp->t_flags &= ~XFS_TRANS_PERM_LOG_RES;
}
undo_blocks:
if (blocks > 0) {
(void) xfs_mod_incore_sb(tp->t_mountp, XFS_SBS_FDBLOCKS,
(int64_t)blocks, rsvd);
tp->t_blk_res = 0;
}
current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
return error;
}
/*
* Record the indicated change to the given field for application
* to the file system's superblock when the transaction commits.
* For now, just store the change in the transaction structure.
*
* Mark the transaction structure to indicate that the superblock
* needs to be updated before committing.
*
* Because we may not be keeping track of allocated/free inodes and
* used filesystem blocks in the superblock, we do not mark the
* superblock dirty in this transaction if we modify these fields.
* We still need to update the transaction deltas so that they get
* applied to the incore superblock, but we don't want them to
* cause the superblock to get locked and logged if these are the
* only fields in the superblock that the transaction modifies.
*/
void
xfs_trans_mod_sb(
xfs_trans_t *tp,
uint field,
int64_t delta)
{
uint32_t flags = (XFS_TRANS_DIRTY|XFS_TRANS_SB_DIRTY);
xfs_mount_t *mp = tp->t_mountp;
switch (field) {
case XFS_TRANS_SB_ICOUNT:
tp->t_icount_delta += delta;
if (xfs_sb_version_haslazysbcount(&mp->m_sb))
flags &= ~XFS_TRANS_SB_DIRTY;
break;
case XFS_TRANS_SB_IFREE:
tp->t_ifree_delta += delta;
if (xfs_sb_version_haslazysbcount(&mp->m_sb))
flags &= ~XFS_TRANS_SB_DIRTY;
break;
case XFS_TRANS_SB_FDBLOCKS:
/*
* Track the number of blocks allocated in the
* transaction. Make sure it does not exceed the
* number reserved.
*/
if (delta < 0) {
tp->t_blk_res_used += (uint)-delta;
ASSERT(tp->t_blk_res_used <= tp->t_blk_res);
}
tp->t_fdblocks_delta += delta;
if (xfs_sb_version_haslazysbcount(&mp->m_sb))
flags &= ~XFS_TRANS_SB_DIRTY;
break;
case XFS_TRANS_SB_RES_FDBLOCKS:
/*
* The allocation has already been applied to the
* in-core superblock's counter. This should only
* be applied to the on-disk superblock.
*/
ASSERT(delta < 0);
tp->t_res_fdblocks_delta += delta;
if (xfs_sb_version_haslazysbcount(&mp->m_sb))
flags &= ~XFS_TRANS_SB_DIRTY;
break;
case XFS_TRANS_SB_FREXTENTS:
/*
* Track the number of blocks allocated in the
* transaction. Make sure it does not exceed the
* number reserved.
*/
if (delta < 0) {
tp->t_rtx_res_used += (uint)-delta;
ASSERT(tp->t_rtx_res_used <= tp->t_rtx_res);
}
tp->t_frextents_delta += delta;
break;
case XFS_TRANS_SB_RES_FREXTENTS:
/*
* The allocation has already been applied to the
* in-core superblock's counter. This should only
* be applied to the on-disk superblock.
*/
ASSERT(delta < 0);
tp->t_res_frextents_delta += delta;
break;
case XFS_TRANS_SB_DBLOCKS:
ASSERT(delta > 0);
tp->t_dblocks_delta += delta;
break;
case XFS_TRANS_SB_AGCOUNT:
ASSERT(delta > 0);
tp->t_agcount_delta += delta;
break;
case XFS_TRANS_SB_IMAXPCT:
tp->t_imaxpct_delta += delta;
break;
case XFS_TRANS_SB_REXTSIZE:
tp->t_rextsize_delta += delta;
break;
case XFS_TRANS_SB_RBMBLOCKS:
tp->t_rbmblocks_delta += delta;
break;
case XFS_TRANS_SB_RBLOCKS:
tp->t_rblocks_delta += delta;
break;
case XFS_TRANS_SB_REXTENTS:
tp->t_rextents_delta += delta;
break;
case XFS_TRANS_SB_REXTSLOG:
tp->t_rextslog_delta += delta;
break;
default:
ASSERT(0);
return;
}
tp->t_flags |= flags;
}
/*
* xfs_trans_apply_sb_deltas() is called from the commit code
* to bring the superblock buffer into the current transaction
* and modify it as requested by earlier calls to xfs_trans_mod_sb().
*
* For now we just look at each field allowed to change and change
* it if necessary.
*/
STATIC void
xfs_trans_apply_sb_deltas(
xfs_trans_t *tp)
{
xfs_dsb_t *sbp;
xfs_buf_t *bp;
int whole = 0;
bp = xfs_trans_getsb(tp, tp->t_mountp, 0);
sbp = XFS_BUF_TO_SBP(bp);
/*
* Check that superblock mods match the mods made to AGF counters.
*/
ASSERT((tp->t_fdblocks_delta + tp->t_res_fdblocks_delta) ==
(tp->t_ag_freeblks_delta + tp->t_ag_flist_delta +
tp->t_ag_btree_delta));
/*
* Only update the superblock counters if we are logging them
*/
if (!xfs_sb_version_haslazysbcount(&(tp->t_mountp->m_sb))) {
if (tp->t_icount_delta)
be64_add(&sbp->sb_icount, tp->t_icount_delta);
if (tp->t_ifree_delta)
be64_add(&sbp->sb_ifree, tp->t_ifree_delta);
if (tp->t_fdblocks_delta)
be64_add(&sbp->sb_fdblocks, tp->t_fdblocks_delta);
if (tp->t_res_fdblocks_delta)
be64_add(&sbp->sb_fdblocks, tp->t_res_fdblocks_delta);
}
if (tp->t_frextents_delta)
be64_add(&sbp->sb_frextents, tp->t_frextents_delta);
if (tp->t_res_frextents_delta)
be64_add(&sbp->sb_frextents, tp->t_res_frextents_delta);
if (tp->t_dblocks_delta) {
be64_add(&sbp->sb_dblocks, tp->t_dblocks_delta);
whole = 1;
}
if (tp->t_agcount_delta) {
be32_add(&sbp->sb_agcount, tp->t_agcount_delta);
whole = 1;
}
if (tp->t_imaxpct_delta) {
sbp->sb_imax_pct += tp->t_imaxpct_delta;
whole = 1;
}
if (tp->t_rextsize_delta) {
be32_add(&sbp->sb_rextsize, tp->t_rextsize_delta);
whole = 1;
}
if (tp->t_rbmblocks_delta) {
be32_add(&sbp->sb_rbmblocks, tp->t_rbmblocks_delta);
whole = 1;
}
if (tp->t_rblocks_delta) {
be64_add(&sbp->sb_rblocks, tp->t_rblocks_delta);
whole = 1;
}
if (tp->t_rextents_delta) {
be64_add(&sbp->sb_rextents, tp->t_rextents_delta);
whole = 1;
}
if (tp->t_rextslog_delta) {
sbp->sb_rextslog += tp->t_rextslog_delta;
whole = 1;
}
if (whole)
/*
* Log the whole thing, the fields are noncontiguous.
*/
xfs_trans_log_buf(tp, bp, 0, sizeof(xfs_dsb_t) - 1);
else
/*
* Since all the modifiable fields are contiguous, we
* can get away with this.
*/
xfs_trans_log_buf(tp, bp, offsetof(xfs_dsb_t, sb_icount),
offsetof(xfs_dsb_t, sb_frextents) +
sizeof(sbp->sb_frextents) - 1);
tp->t_mountp->m_super->s_dirt = 1;
}
/*
* xfs_trans_unreserve_and_mod_sb() is called to release unused reservations
* and apply superblock counter changes to the in-core superblock. The
* t_res_fdblocks_delta and t_res_frextents_delta fields are explicitly NOT
* applied to the in-core superblock. The idea is that that has already been
* done.
*
* This is done efficiently with a single call to xfs_mod_incore_sb_batch().
* However, we have to ensure that we only modify each superblock field only
* once because the application of the delta values may not be atomic. That can
* lead to ENOSPC races occurring if we have two separate modifcations of the
* free space counter to put back the entire reservation and then take away
* what we used.
*
* If we are not logging superblock counters, then the inode allocated/free and
* used block counts are not updated in the on disk superblock. In this case,
* XFS_TRANS_SB_DIRTY will not be set when the transaction is updated but we
* still need to update the incore superblock with the changes.
*/
STATIC void
xfs_trans_unreserve_and_mod_sb(
xfs_trans_t *tp)
{
xfs_mod_sb_t msb[14]; /* If you add cases, add entries */
xfs_mod_sb_t *msbp;
xfs_mount_t *mp = tp->t_mountp;
/* REFERENCED */
int error;
int rsvd;
int64_t blkdelta = 0;
int64_t rtxdelta = 0;
msbp = msb;
rsvd = (tp->t_flags & XFS_TRANS_RESERVE) != 0;
/* calculate free blocks delta */
if (tp->t_blk_res > 0)
blkdelta = tp->t_blk_res;
if ((tp->t_fdblocks_delta != 0) &&
(xfs_sb_version_haslazysbcount(&mp->m_sb) ||
(tp->t_flags & XFS_TRANS_SB_DIRTY)))
blkdelta += tp->t_fdblocks_delta;
if (blkdelta != 0) {
msbp->msb_field = XFS_SBS_FDBLOCKS;
msbp->msb_delta = blkdelta;
msbp++;
}
/* calculate free realtime extents delta */
if (tp->t_rtx_res > 0)
rtxdelta = tp->t_rtx_res;
if ((tp->t_frextents_delta != 0) &&
(tp->t_flags & XFS_TRANS_SB_DIRTY))
rtxdelta += tp->t_frextents_delta;
if (rtxdelta != 0) {
msbp->msb_field = XFS_SBS_FREXTENTS;
msbp->msb_delta = rtxdelta;
msbp++;
}
/* apply remaining deltas */
if (xfs_sb_version_haslazysbcount(&mp->m_sb) ||
(tp->t_flags & XFS_TRANS_SB_DIRTY)) {
if (tp->t_icount_delta != 0) {
msbp->msb_field = XFS_SBS_ICOUNT;
msbp->msb_delta = tp->t_icount_delta;
msbp++;
}
if (tp->t_ifree_delta != 0) {
msbp->msb_field = XFS_SBS_IFREE;
msbp->msb_delta = tp->t_ifree_delta;
msbp++;
}
}
if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
if (tp->t_dblocks_delta != 0) {
msbp->msb_field = XFS_SBS_DBLOCKS;
msbp->msb_delta = tp->t_dblocks_delta;
msbp++;
}
if (tp->t_agcount_delta != 0) {
msbp->msb_field = XFS_SBS_AGCOUNT;
msbp->msb_delta = tp->t_agcount_delta;
msbp++;
}
if (tp->t_imaxpct_delta != 0) {
msbp->msb_field = XFS_SBS_IMAX_PCT;
msbp->msb_delta = tp->t_imaxpct_delta;
msbp++;
}
if (tp->t_rextsize_delta != 0) {
msbp->msb_field = XFS_SBS_REXTSIZE;
msbp->msb_delta = tp->t_rextsize_delta;
msbp++;
}
if (tp->t_rbmblocks_delta != 0) {
msbp->msb_field = XFS_SBS_RBMBLOCKS;
msbp->msb_delta = tp->t_rbmblocks_delta;
msbp++;
}
if (tp->t_rblocks_delta != 0) {
msbp->msb_field = XFS_SBS_RBLOCKS;
msbp->msb_delta = tp->t_rblocks_delta;
msbp++;
}
if (tp->t_rextents_delta != 0) {
msbp->msb_field = XFS_SBS_REXTENTS;
msbp->msb_delta = tp->t_rextents_delta;
msbp++;
}
if (tp->t_rextslog_delta != 0) {
msbp->msb_field = XFS_SBS_REXTSLOG;
msbp->msb_delta = tp->t_rextslog_delta;
msbp++;
}
}
/*
* If we need to change anything, do it.
*/
if (msbp > msb) {
error = xfs_mod_incore_sb_batch(tp->t_mountp, msb,
(uint)(msbp - msb), rsvd);
ASSERT(error == 0);
}
}
/*
* xfs_trans_commit
*
* Commit the given transaction to the log a/synchronously.
*
* XFS disk error handling mechanism is not based on a typical
* transaction abort mechanism. Logically after the filesystem
* gets marked 'SHUTDOWN', we can't let any new transactions
* be durable - ie. committed to disk - because some metadata might
* be inconsistent. In such cases, this returns an error, and the
* caller may assume that all locked objects joined to the transaction
* have already been unlocked as if the commit had succeeded.
* Do not reference the transaction structure after this call.
*/
/*ARGSUSED*/
int
_xfs_trans_commit(
xfs_trans_t *tp,
uint flags,
int *log_flushed)
{
xfs_log_iovec_t *log_vector;
int nvec;
xfs_mount_t *mp;
xfs_lsn_t commit_lsn;
/* REFERENCED */
int error;
int log_flags;
int sync;
#define XFS_TRANS_LOGVEC_COUNT 16
xfs_log_iovec_t log_vector_fast[XFS_TRANS_LOGVEC_COUNT];
void *commit_iclog;
int shutdown;
commit_lsn = -1;
/*
* Determine whether this commit is releasing a permanent
* log reservation or not.
*/
if (flags & XFS_TRANS_RELEASE_LOG_RES) {
ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
log_flags = XFS_LOG_REL_PERM_RESERV;
} else {
log_flags = 0;
}
mp = tp->t_mountp;
/*
* If there is nothing to be logged by the transaction,
* then unlock all of the items associated with the
* transaction and free the transaction structure.
* Also make sure to return any reserved blocks to
* the free pool.
*/
shut_us_down:
shutdown = XFS_FORCED_SHUTDOWN(mp) ? EIO : 0;
if (!(tp->t_flags & XFS_TRANS_DIRTY) || shutdown) {
xfs_trans_unreserve_and_mod_sb(tp);
/*
* It is indeed possible for the transaction to be
* not dirty but the dqinfo portion to be. All that
* means is that we have some (non-persistent) quota
* reservations that need to be unreserved.
*/
XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(mp, tp);
if (tp->t_ticket) {
commit_lsn = xfs_log_done(mp, tp->t_ticket,
NULL, log_flags);
if (commit_lsn == -1 && !shutdown)
shutdown = XFS_ERROR(EIO);
}
current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
xfs_trans_free_items(tp, shutdown? XFS_TRANS_ABORT : 0);
xfs_trans_free_busy(tp);
xfs_trans_free(tp);
XFS_STATS_INC(xs_trans_empty);
return (shutdown);
}
ASSERT(tp->t_ticket != NULL);
/*
* If we need to update the superblock, then do it now.
*/
if (tp->t_flags & XFS_TRANS_SB_DIRTY) {
xfs_trans_apply_sb_deltas(tp);
}
XFS_TRANS_APPLY_DQUOT_DELTAS(mp, tp);
/*
* Ask each log item how many log_vector entries it will
* need so we can figure out how many to allocate.
* Try to avoid the kmem_alloc() call in the common case
* by using a vector from the stack when it fits.
*/
nvec = xfs_trans_count_vecs(tp);
if (nvec == 0) {
xfs_force_shutdown(mp, SHUTDOWN_LOG_IO_ERROR);
goto shut_us_down;
} else if (nvec <= XFS_TRANS_LOGVEC_COUNT) {
log_vector = log_vector_fast;
} else {
log_vector = (xfs_log_iovec_t *)kmem_alloc(nvec *
sizeof(xfs_log_iovec_t),
KM_SLEEP);
}
/*
* Fill in the log_vector and pin the logged items, and
* then write the transaction to the log.
*/
xfs_trans_fill_vecs(tp, log_vector);
error = xfs_log_write(mp, log_vector, nvec, tp->t_ticket, &(tp->t_lsn));
/*
* The transaction is committed incore here, and can go out to disk
* at any time after this call. However, all the items associated
* with the transaction are still locked and pinned in memory.
*/
commit_lsn = xfs_log_done(mp, tp->t_ticket, &commit_iclog, log_flags);
tp->t_commit_lsn = commit_lsn;
if (nvec > XFS_TRANS_LOGVEC_COUNT) {
kmem_free(log_vector, nvec * sizeof(xfs_log_iovec_t));
}
/*
* If we got a log write error. Unpin the logitems that we
* had pinned, clean up, free trans structure, and return error.
*/
if (error || commit_lsn == -1) {
current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
xfs_trans_uncommit(tp, flags|XFS_TRANS_ABORT);
return XFS_ERROR(EIO);
}
/*
* Once the transaction has committed, unused
* reservations need to be released and changes to
* the superblock need to be reflected in the in-core
* version. Do that now.
*/
xfs_trans_unreserve_and_mod_sb(tp);
sync = tp->t_flags & XFS_TRANS_SYNC;
/*
* Tell the LM to call the transaction completion routine
* when the log write with LSN commit_lsn completes (e.g.
* when the transaction commit really hits the on-disk log).
* After this call we cannot reference tp, because the call
* can happen at any time and the call will free the transaction
* structure pointed to by tp. The only case where we call
* the completion routine (xfs_trans_committed) directly is
* if the log is turned off on a debug kernel or we're
* running in simulation mode (the log is explicitly turned
* off).
*/
tp->t_logcb.cb_func = (void(*)(void*, int))xfs_trans_committed;
tp->t_logcb.cb_arg = tp;
/*
* We need to pass the iclog buffer which was used for the
* transaction commit record into this function, and attach
* the callback to it. The callback must be attached before
* the items are unlocked to avoid racing with other threads
* waiting for an item to unlock.
*/
shutdown = xfs_log_notify(mp, commit_iclog, &(tp->t_logcb));
/*
* Mark this thread as no longer being in a transaction
*/
current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
/*
* Once all the items of the transaction have been copied
* to the in core log and the callback is attached, the
* items can be unlocked.
*
* This will free descriptors pointing to items which were
* not logged since there is nothing more to do with them.
* For items which were logged, we will keep pointers to them
* so they can be unpinned after the transaction commits to disk.
* This will also stamp each modified meta-data item with
* the commit lsn of this transaction for dependency tracking
* purposes.
*/
xfs_trans_unlock_items(tp, commit_lsn);
/*
* If we detected a log error earlier, finish committing
* the transaction now (unpin log items, etc).
*
* Order is critical here, to avoid using the transaction
* pointer after its been freed (by xfs_trans_committed
* either here now, or as a callback). We cannot do this
* step inside xfs_log_notify as was done earlier because
* of this issue.
*/
if (shutdown)
xfs_trans_committed(tp, XFS_LI_ABORTED);
/*
* Now that the xfs_trans_committed callback has been attached,
* and the items are released we can finally allow the iclog to
* go to disk.
*/
error = xfs_log_release_iclog(mp, commit_iclog);
/*
* If the transaction needs to be synchronous, then force the
* log out now and wait for it.
*/
if (sync) {
if (!error) {
error = _xfs_log_force(mp, commit_lsn,
XFS_LOG_FORCE | XFS_LOG_SYNC,
log_flushed);
}
XFS_STATS_INC(xs_trans_sync);
} else {
XFS_STATS_INC(xs_trans_async);
}
return (error);
}
/*
* Total up the number of log iovecs needed to commit this
* transaction. The transaction itself needs one for the
* transaction header. Ask each dirty item in turn how many
* it needs to get the total.
*/
STATIC uint
xfs_trans_count_vecs(
xfs_trans_t *tp)
{
int nvecs;
xfs_log_item_desc_t *lidp;
nvecs = 1;
lidp = xfs_trans_first_item(tp);
ASSERT(lidp != NULL);
/* In the non-debug case we need to start bailing out if we
* didn't find a log_item here, return zero and let trans_commit
* deal with it.
*/
if (lidp == NULL)
return 0;
while (lidp != NULL) {
/*
* Skip items which aren't dirty in this transaction.
*/
if (!(lidp->lid_flags & XFS_LID_DIRTY)) {
lidp = xfs_trans_next_item(tp, lidp);
continue;
}
lidp->lid_size = IOP_SIZE(lidp->lid_item);
nvecs += lidp->lid_size;
lidp = xfs_trans_next_item(tp, lidp);
}
return nvecs;
}
/*
* Called from the trans_commit code when we notice that
* the filesystem is in the middle of a forced shutdown.
*/
STATIC void
xfs_trans_uncommit(
xfs_trans_t *tp,
uint flags)
{
xfs_log_item_desc_t *lidp;
for (lidp = xfs_trans_first_item(tp);
lidp != NULL;
lidp = xfs_trans_next_item(tp, lidp)) {
/*
* Unpin all but those that aren't dirty.
*/
if (lidp->lid_flags & XFS_LID_DIRTY)
IOP_UNPIN_REMOVE(lidp->lid_item, tp);
}
xfs_trans_unreserve_and_mod_sb(tp);
XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(tp->t_mountp, tp);
xfs_trans_free_items(tp, flags);
xfs_trans_free_busy(tp);
xfs_trans_free(tp);
}
/*
* Fill in the vector with pointers to data to be logged
* by this transaction. The transaction header takes
* the first vector, and then each dirty item takes the
* number of vectors it indicated it needed in xfs_trans_count_vecs().
*
* As each item fills in the entries it needs, also pin the item
* so that it cannot be flushed out until the log write completes.
*/
STATIC void
xfs_trans_fill_vecs(
xfs_trans_t *tp,
xfs_log_iovec_t *log_vector)
{
xfs_log_item_desc_t *lidp;
xfs_log_iovec_t *vecp;
uint nitems;
/*
* Skip over the entry for the transaction header, we'll
* fill that in at the end.
*/
vecp = log_vector + 1; /* pointer arithmetic */
nitems = 0;
lidp = xfs_trans_first_item(tp);
ASSERT(lidp != NULL);
while (lidp != NULL) {
/*
* Skip items which aren't dirty in this transaction.
*/
if (!(lidp->lid_flags & XFS_LID_DIRTY)) {
lidp = xfs_trans_next_item(tp, lidp);
continue;
}
/*
* The item may be marked dirty but not log anything.
* This can be used to get called when a transaction
* is committed.
*/
if (lidp->lid_size) {
nitems++;
}
IOP_FORMAT(lidp->lid_item, vecp);
vecp += lidp->lid_size; /* pointer arithmetic */
IOP_PIN(lidp->lid_item);
lidp = xfs_trans_next_item(tp, lidp);
}
/*
* Now that we've counted the number of items in this
* transaction, fill in the transaction header.
*/
tp->t_header.th_magic = XFS_TRANS_HEADER_MAGIC;
tp->t_header.th_type = tp->t_type;
tp->t_header.th_num_items = nitems;
log_vector->i_addr = (xfs_caddr_t)&tp->t_header;
log_vector->i_len = sizeof(xfs_trans_header_t);
XLOG_VEC_SET_TYPE(log_vector, XLOG_REG_TYPE_TRANSHDR);
}
/*
* Unlock all of the transaction's items and free the transaction.
* The transaction must not have modified any of its items, because
* there is no way to restore them to their previous state.
*
* If the transaction has made a log reservation, make sure to release
* it as well.
*/
void
xfs_trans_cancel(
xfs_trans_t *tp,
int flags)
{
int log_flags;
#ifdef DEBUG
xfs_log_item_chunk_t *licp;
xfs_log_item_desc_t *lidp;
xfs_log_item_t *lip;
int i;
#endif
xfs_mount_t *mp = tp->t_mountp;
/*
* See if the caller is being too lazy to figure out if
* the transaction really needs an abort.
*/
if ((flags & XFS_TRANS_ABORT) && !(tp->t_flags & XFS_TRANS_DIRTY))
flags &= ~XFS_TRANS_ABORT;
/*
* See if the caller is relying on us to shut down the
* filesystem. This happens in paths where we detect
* corruption and decide to give up.
*/
if ((tp->t_flags & XFS_TRANS_DIRTY) && !XFS_FORCED_SHUTDOWN(mp)) {
XFS_ERROR_REPORT("xfs_trans_cancel", XFS_ERRLEVEL_LOW, mp);
xfs_force_shutdown(mp, SHUTDOWN_CORRUPT_INCORE);
}
#ifdef DEBUG
if (!(flags & XFS_TRANS_ABORT)) {
licp = &(tp->t_items);
while (licp != NULL) {
lidp = licp->lic_descs;
for (i = 0; i < licp->lic_unused; i++, lidp++) {
if (XFS_LIC_ISFREE(licp, i)) {
continue;
}
lip = lidp->lid_item;
if (!XFS_FORCED_SHUTDOWN(mp))
ASSERT(!(lip->li_type == XFS_LI_EFD));
}
licp = licp->lic_next;
}
}
#endif
xfs_trans_unreserve_and_mod_sb(tp);
XFS_TRANS_UNRESERVE_AND_MOD_DQUOTS(mp, tp);
if (tp->t_ticket) {
if (flags & XFS_TRANS_RELEASE_LOG_RES) {
ASSERT(tp->t_flags & XFS_TRANS_PERM_LOG_RES);
log_flags = XFS_LOG_REL_PERM_RESERV;
} else {
log_flags = 0;
}
xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
}
/* mark this thread as no longer being in a transaction */
current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
xfs_trans_free_items(tp, flags);
xfs_trans_free_busy(tp);
xfs_trans_free(tp);
}
/*
* Free the transaction structure. If there is more clean up
* to do when the structure is freed, add it here.
*/
STATIC void
xfs_trans_free(
xfs_trans_t *tp)
{
atomic_dec(&tp->t_mountp->m_active_trans);
XFS_TRANS_FREE_DQINFO(tp->t_mountp, tp);
kmem_zone_free(xfs_trans_zone, tp);
}
/*
* THIS SHOULD BE REWRITTEN TO USE xfs_trans_next_item().
*
* This is typically called by the LM when a transaction has been fully
* committed to disk. It needs to unpin the items which have
* been logged by the transaction and update their positions
* in the AIL if necessary.
* This also gets called when the transactions didn't get written out
* because of an I/O error. Abortflag & XFS_LI_ABORTED is set then.
*
* Call xfs_trans_chunk_committed() to process the items in
* each chunk.
*/
STATIC void
xfs_trans_committed(
xfs_trans_t *tp,
int abortflag)
{
xfs_log_item_chunk_t *licp;
xfs_log_item_chunk_t *next_licp;
xfs_log_busy_chunk_t *lbcp;
xfs_log_busy_slot_t *lbsp;
int i;
/*
* Call the transaction's completion callback if there
* is one.
*/
if (tp->t_callback != NULL) {
tp->t_callback(tp, tp->t_callarg);
}
/*
* Special case the chunk embedded in the transaction.
*/
licp = &(tp->t_items);
if (!(XFS_LIC_ARE_ALL_FREE(licp))) {
xfs_trans_chunk_committed(licp, tp->t_lsn, abortflag);
}
/*
* Process the items in each chunk in turn.
*/
licp = licp->lic_next;
while (licp != NULL) {
ASSERT(!XFS_LIC_ARE_ALL_FREE(licp));
xfs_trans_chunk_committed(licp, tp->t_lsn, abortflag);
next_licp = licp->lic_next;
kmem_free(licp, sizeof(xfs_log_item_chunk_t));
licp = next_licp;
}
/*
* Clear all the per-AG busy list items listed in this transaction
*/
lbcp = &tp->t_busy;
while (lbcp != NULL) {
for (i = 0, lbsp = lbcp->lbc_busy; i < lbcp->lbc_unused; i++, lbsp++) {
if (!XFS_LBC_ISFREE(lbcp, i)) {
xfs_alloc_clear_busy(tp, lbsp->lbc_ag,
lbsp->lbc_idx);
}
}
lbcp = lbcp->lbc_next;
}
xfs_trans_free_busy(tp);
/*
* That's it for the transaction structure. Free it.
*/
xfs_trans_free(tp);
}
/*
* This is called to perform the commit processing for each
* item described by the given chunk.
*
* The commit processing consists of unlocking items which were
* held locked with the SYNC_UNLOCK attribute, calling the committed
* routine of each logged item, updating the item's position in the AIL
* if necessary, and unpinning each item. If the committed routine
* returns -1, then do nothing further with the item because it
* may have been freed.
*
* Since items are unlocked when they are copied to the incore
* log, it is possible for two transactions to be completing
* and manipulating the same item simultaneously. The AIL lock
* will protect the lsn field of each item. The value of this
* field can never go backwards.
*
* We unpin the items after repositioning them in the AIL, because
* otherwise they could be immediately flushed and we'd have to race
* with the flusher trying to pull the item from the AIL as we add it.
*/
STATIC void
xfs_trans_chunk_committed(
xfs_log_item_chunk_t *licp,
xfs_lsn_t lsn,
int aborted)
{
xfs_log_item_desc_t *lidp;
xfs_log_item_t *lip;
xfs_lsn_t item_lsn;
struct xfs_mount *mp;
int i;
lidp = licp->lic_descs;
for (i = 0; i < licp->lic_unused; i++, lidp++) {
if (XFS_LIC_ISFREE(licp, i)) {
continue;
}
lip = lidp->lid_item;
if (aborted)
lip->li_flags |= XFS_LI_ABORTED;
/*
* Send in the ABORTED flag to the COMMITTED routine
* so that it knows whether the transaction was aborted
* or not.
*/
item_lsn = IOP_COMMITTED(lip, lsn);
/*
* If the committed routine returns -1, make
* no more references to the item.
*/
if (XFS_LSN_CMP(item_lsn, (xfs_lsn_t)-1) == 0) {
continue;
}
/*
* If the returned lsn is greater than what it
* contained before, update the location of the
* item in the AIL. If it is not, then do nothing.
* Items can never move backwards in the AIL.
*
* While the new lsn should usually be greater, it
* is possible that a later transaction completing
* simultaneously with an earlier one using the
* same item could complete first with a higher lsn.
* This would cause the earlier transaction to fail
* the test below.
*/
mp = lip->li_mountp;
spin_lock(&mp->m_ail_lock);
if (XFS_LSN_CMP(item_lsn, lip->li_lsn) > 0) {
/*
* This will set the item's lsn to item_lsn
* and update the position of the item in
* the AIL.
*
* xfs_trans_update_ail() drops the AIL lock.
*/
xfs_trans_update_ail(mp, lip, item_lsn);
} else {
spin_unlock(&mp->m_ail_lock);
}
/*
* Now that we've repositioned the item in the AIL,
* unpin it so it can be flushed. Pass information
* about buffer stale state down from the log item
* flags, if anyone else stales the buffer we do not
* want to pay any attention to it.
*/
IOP_UNPIN(lip, lidp->lid_flags & XFS_LID_BUF_STALE);
}
}
