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xfs: log refcount intent items 

Provide a mechanism for higher levels to create CUI/CUD items, submit
them to the log, and a stub function to deal with recovered CUI items.
These parts will be connected to the refcountbt in a later patch.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2016-10-03 09:11:21 -07:00
parent baf4bcacb7
commit f997ee2137
8 changed files with 375 additions and 0 deletions
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1
fs/xfs/Makefile
View File

@ -113,6 +113,7 @@ xfs-y += xfs_log.o \
xfs_trans_buf.o \
xfs_trans_extfree.o \
xfs_trans_inode.o \
xfs_trans_refcount.o \
xfs_trans_rmap.o \
# optional features

14
fs/xfs/libxfs/xfs_refcount.h
View File

@ -27,4 +27,18 @@ extern int xfs_refcount_lookup_ge(struct xfs_btree_cur *cur,
extern int xfs_refcount_get_rec(struct xfs_btree_cur *cur,
struct xfs_refcount_irec *irec, int *stat);
enum xfs_refcount_intent_type {
XFS_REFCOUNT_INCREASE = 1,
XFS_REFCOUNT_DECREASE,
XFS_REFCOUNT_ALLOC_COW,
XFS_REFCOUNT_FREE_COW,
};
struct xfs_refcount_intent {
struct list_head ri_list;
enum xfs_refcount_intent_type ri_type;
xfs_fsblock_t ri_startblock;
xfs_extlen_t ri_blockcount;
};
#endif /* __XFS_REFCOUNT_H__ */

175
fs/xfs/xfs_log_recover.c
View File

@ -45,6 +45,7 @@
#include "xfs_dir2.h"
#include "xfs_rmap_item.h"
#include "xfs_buf_item.h"
#include "xfs_refcount_item.h"
#define BLK_AVG(blk1, blk2) ((blk1+blk2) >> 1)
@ -1924,6 +1925,8 @@ xlog_recover_reorder_trans(
case XFS_LI_EFI:
case XFS_LI_RUI:
case XFS_LI_RUD:
case XFS_LI_CUI:
case XFS_LI_CUD:
trace_xfs_log_recover_item_reorder_tail(log,
trans, item, pass);
list_move_tail(&item->ri_list, &inode_list);
@ -3546,6 +3549,123 @@ xlog_recover_rud_pass2(
return 0;
}
/*
* Copy an CUI format buffer from the given buf, and into the destination
* CUI format structure. The CUI/CUD items were designed not to need any
* special alignment handling.
*/
static int
xfs_cui_copy_format(
struct xfs_log_iovec *buf,
struct xfs_cui_log_format *dst_cui_fmt)
{
struct xfs_cui_log_format *src_cui_fmt;
uint len;
src_cui_fmt = buf->i_addr;
len = xfs_cui_log_format_sizeof(src_cui_fmt->cui_nextents);
if (buf->i_len == len) {
memcpy(dst_cui_fmt, src_cui_fmt, len);
return 0;
}
return -EFSCORRUPTED;
}
/*
* This routine is called to create an in-core extent refcount update
* item from the cui format structure which was logged on disk.
* It allocates an in-core cui, copies the extents from the format
* structure into it, and adds the cui to the AIL with the given
* LSN.
*/
STATIC int
xlog_recover_cui_pass2(
struct xlog *log,
struct xlog_recover_item *item,
xfs_lsn_t lsn)
{
int error;
struct xfs_mount *mp = log->l_mp;
struct xfs_cui_log_item *cuip;
struct xfs_cui_log_format *cui_formatp;
cui_formatp = item->ri_buf[0].i_addr;
cuip = xfs_cui_init(mp, cui_formatp->cui_nextents);
error = xfs_cui_copy_format(&item->ri_buf[0], &cuip->cui_format);
if (error) {
xfs_cui_item_free(cuip);
return error;
}
atomic_set(&cuip->cui_next_extent, cui_formatp->cui_nextents);
spin_lock(&log->l_ailp->xa_lock);
/*
* The CUI has two references. One for the CUD and one for CUI to ensure
* it makes it into the AIL. Insert the CUI into the AIL directly and
* drop the CUI reference. Note that xfs_trans_ail_update() drops the
* AIL lock.
*/
xfs_trans_ail_update(log->l_ailp, &cuip->cui_item, lsn);
xfs_cui_release(cuip);
return 0;
}
/*
* This routine is called when an CUD format structure is found in a committed
* transaction in the log. Its purpose is to cancel the corresponding CUI if it
* was still in the log. To do this it searches the AIL for the CUI with an id
* equal to that in the CUD format structure. If we find it we drop the CUD
* reference, which removes the CUI from the AIL and frees it.
*/
STATIC int
xlog_recover_cud_pass2(
struct xlog *log,
struct xlog_recover_item *item)
{
struct xfs_cud_log_format *cud_formatp;
struct xfs_cui_log_item *cuip = NULL;
struct xfs_log_item *lip;
__uint64_t cui_id;
struct xfs_ail_cursor cur;
struct xfs_ail *ailp = log->l_ailp;
cud_formatp = item->ri_buf[0].i_addr;
if (item->ri_buf[0].i_len != sizeof(struct xfs_cud_log_format))
return -EFSCORRUPTED;
cui_id = cud_formatp->cud_cui_id;
/*
* Search for the CUI with the id in the CUD format structure in the
* AIL.
*/
spin_lock(&ailp->xa_lock);
lip = xfs_trans_ail_cursor_first(ailp, &cur, 0);
while (lip != NULL) {
if (lip->li_type == XFS_LI_CUI) {
cuip = (struct xfs_cui_log_item *)lip;
if (cuip->cui_format.cui_id == cui_id) {
/*
* Drop the CUD reference to the CUI. This
* removes the CUI from the AIL and frees it.
*/
spin_unlock(&ailp->xa_lock);
xfs_cui_release(cuip);
spin_lock(&ailp->xa_lock);
break;
}
}
lip = xfs_trans_ail_cursor_next(ailp, &cur);
}
xfs_trans_ail_cursor_done(&cur);
spin_unlock(&ailp->xa_lock);
return 0;
}
/*
* This routine is called when an inode create format structure is found in a
* committed transaction in the log. It's purpose is to initialise the inodes
@ -3773,6 +3893,8 @@ xlog_recover_ra_pass2(
case XFS_LI_QUOTAOFF:
case XFS_LI_RUI:
case XFS_LI_RUD:
case XFS_LI_CUI:
case XFS_LI_CUD:
default:
break;
}
@ -3798,6 +3920,8 @@ xlog_recover_commit_pass1(
case XFS_LI_ICREATE:
case XFS_LI_RUI:
case XFS_LI_RUD:
case XFS_LI_CUI:
case XFS_LI_CUD:
/* nothing to do in pass 1 */
return 0;
default:
@ -3832,6 +3956,10 @@ xlog_recover_commit_pass2(
return xlog_recover_rui_pass2(log, item, trans->r_lsn);
case XFS_LI_RUD:
return xlog_recover_rud_pass2(log, item);
case XFS_LI_CUI:
return xlog_recover_cui_pass2(log, item, trans->r_lsn);
case XFS_LI_CUD:
return xlog_recover_cud_pass2(log, item);
case XFS_LI_DQUOT:
return xlog_recover_dquot_pass2(log, buffer_list, item,
trans->r_lsn);
@ -4419,12 +4547,53 @@ xlog_recover_cancel_rui(
spin_lock(&ailp->xa_lock);
}
/* Recover the CUI if necessary. */
STATIC int
xlog_recover_process_cui(
struct xfs_mount *mp,
struct xfs_ail *ailp,
struct xfs_log_item *lip)
{
struct xfs_cui_log_item *cuip;
int error;
/*
* Skip CUIs that we've already processed.
*/
cuip = container_of(lip, struct xfs_cui_log_item, cui_item);
if (test_bit(XFS_CUI_RECOVERED, &cuip->cui_flags))
return 0;
spin_unlock(&ailp->xa_lock);
error = xfs_cui_recover(mp, cuip);
spin_lock(&ailp->xa_lock);
return error;
}
/* Release the CUI since we're cancelling everything. */
STATIC void
xlog_recover_cancel_cui(
struct xfs_mount *mp,
struct xfs_ail *ailp,
struct xfs_log_item *lip)
{
struct xfs_cui_log_item *cuip;
cuip = container_of(lip, struct xfs_cui_log_item, cui_item);
spin_unlock(&ailp->xa_lock);
xfs_cui_release(cuip);
spin_lock(&ailp->xa_lock);
}
/* Is this log item a deferred action intent? */
static inline bool xlog_item_is_intent(struct xfs_log_item *lip)
{
switch (lip->li_type) {
case XFS_LI_EFI:
case XFS_LI_RUI:
case XFS_LI_CUI:
return true;
default:
return false;
@ -4488,6 +4657,9 @@ xlog_recover_process_intents(
case XFS_LI_RUI:
error = xlog_recover_process_rui(log->l_mp, ailp, lip);
break;
case XFS_LI_CUI:
error = xlog_recover_process_cui(log->l_mp, ailp, lip);
break;
}
if (error)
goto out;
@ -4535,6 +4707,9 @@ xlog_recover_cancel_intents(
case XFS_LI_RUI:
xlog_recover_cancel_rui(log->l_mp, ailp, lip);
break;
case XFS_LI_CUI:
xlog_recover_cancel_cui(log->l_mp, ailp, lip);
break;
}
lip = xfs_trans_ail_cursor_next(ailp, &cur);

60
fs/xfs/xfs_refcount_item.c
View File

@ -22,12 +22,15 @@
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_bit.h"
#include "xfs_mount.h"
#include "xfs_defer.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_buf_item.h"
#include "xfs_refcount_item.h"
#include "xfs_log.h"
#include "xfs_refcount.h"
kmem_zone_t *xfs_cui_zone;
@ -381,3 +384,60 @@ xfs_cud_init(
return cudp;
}
/*
* Process a refcount update intent item that was recovered from the log.
* We need to update the refcountbt.
*/
int
xfs_cui_recover(
struct xfs_mount *mp,
struct xfs_cui_log_item *cuip)
{
int i;
int error = 0;
struct xfs_phys_extent *refc;
xfs_fsblock_t startblock_fsb;
bool op_ok;
ASSERT(!test_bit(XFS_CUI_RECOVERED, &cuip->cui_flags));
/*
* First check the validity of the extents described by the
* CUI. If any are bad, then assume that all are bad and
* just toss the CUI.
*/
for (i = 0; i < cuip->cui_format.cui_nextents; i++) {
refc = &cuip->cui_format.cui_extents[i];
startblock_fsb = XFS_BB_TO_FSB(mp,
XFS_FSB_TO_DADDR(mp, refc->pe_startblock));
switch (refc->pe_flags & XFS_REFCOUNT_EXTENT_TYPE_MASK) {
case XFS_REFCOUNT_INCREASE:
case XFS_REFCOUNT_DECREASE:
case XFS_REFCOUNT_ALLOC_COW:
case XFS_REFCOUNT_FREE_COW:
op_ok = true;
break;
default:
op_ok = false;
break;
}
if (!op_ok || startblock_fsb == 0 ||
refc->pe_len == 0 ||
startblock_fsb >= mp->m_sb.sb_dblocks ||
refc->pe_len >= mp->m_sb.sb_agblocks ||
(refc->pe_flags & ~XFS_REFCOUNT_EXTENT_FLAGS)) {
/*
* This will pull the CUI from the AIL and
* free the memory associated with it.
*/
set_bit(XFS_CUI_RECOVERED, &cuip->cui_flags);
xfs_cui_release(cuip);
return -EIO;
}
}
set_bit(XFS_CUI_RECOVERED, &cuip->cui_flags);
xfs_cui_release(cuip);
return error;
}

1
fs/xfs/xfs_refcount_item.h
View File

@ -96,5 +96,6 @@ struct xfs_cud_log_item *xfs_cud_init(struct xfs_mount *,
struct xfs_cui_log_item *);
void xfs_cui_item_free(struct xfs_cui_log_item *);
void xfs_cui_release(struct xfs_cui_log_item *);
int xfs_cui_recover(struct xfs_mount *mp, struct xfs_cui_log_item *cuip);
#endif /* __XFS_REFCOUNT_ITEM_H__ */

33
fs/xfs/xfs_trace.h
View File

@ -2932,6 +2932,39 @@ DEFINE_AG_EXTENT_EVENT(xfs_refcount_find_shared);
DEFINE_AG_EXTENT_EVENT(xfs_refcount_find_shared_result);
DEFINE_AG_ERROR_EVENT(xfs_refcount_find_shared_error);
TRACE_EVENT(xfs_refcount_finish_one_leftover,
TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno,
int type, xfs_agblock_t agbno, xfs_extlen_t len,
xfs_agblock_t new_agbno, xfs_extlen_t new_len),
TP_ARGS(mp, agno, type, agbno, len, new_agbno, new_len),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(xfs_agnumber_t, agno)
__field(int, type)
__field(xfs_agblock_t, agbno)
__field(xfs_extlen_t, len)
__field(xfs_agblock_t, new_agbno)
__field(xfs_extlen_t, new_len)
),
TP_fast_assign(
__entry->dev = mp->m_super->s_dev;
__entry->agno = agno;
__entry->type = type;
__entry->agbno = agbno;
__entry->len = len;
__entry->new_agbno = new_agbno;
__entry->new_len = new_len;
),
TP_printk("dev %d:%d type %d agno %u agbno %u len %u new_agbno %u new_len %u",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->type,
__entry->agno,
__entry->agbno,
__entry->len,
__entry->new_agbno,
__entry->new_len)
);
#endif /* _TRACE_XFS_H */
#undef TRACE_INCLUDE_PATH

11
fs/xfs/xfs_trans.h
View File

@ -36,6 +36,7 @@ struct xfs_busy_extent;
struct xfs_rud_log_item;
struct xfs_rui_log_item;
struct xfs_btree_cur;
struct xfs_cui_log_item;
typedef struct xfs_log_item {
struct list_head li_ail; /* AIL pointers */
@ -248,4 +249,14 @@ int xfs_trans_log_finish_rmap_update(struct xfs_trans *tp,
xfs_fsblock_t startblock, xfs_filblks_t blockcount,
xfs_exntst_t state, struct xfs_btree_cur **pcur);
/* refcount updates */
enum xfs_refcount_intent_type;
struct xfs_cud_log_item *xfs_trans_get_cud(struct xfs_trans *tp,
struct xfs_cui_log_item *cuip);
int xfs_trans_log_finish_refcount_update(struct xfs_trans *tp,
struct xfs_cud_log_item *cudp,
enum xfs_refcount_intent_type type, xfs_fsblock_t startblock,
xfs_extlen_t blockcount, struct xfs_btree_cur **pcur);
#endif /* __XFS_TRANS_H__ */

80
fs/xfs/xfs_trans_refcount.c Normal file
View File

@ -0,0 +1,80 @@
/*
* Copyright (C) 2016 Oracle. All Rights Reserved.
*
* Author: Darrick J. Wong <darrick.wong@oracle.com>
*
* 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; either version 2
* of the License, or (at your option) any later version.
*
* 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_shared.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
#include "xfs_trans_resv.h"
#include "xfs_mount.h"
#include "xfs_defer.h"
#include "xfs_trans.h"
#include "xfs_trans_priv.h"
#include "xfs_refcount_item.h"
#include "xfs_alloc.h"
#include "xfs_refcount.h"
/*
* This routine is called to allocate a "refcount update done"
* log item.
*/
struct xfs_cud_log_item *
xfs_trans_get_cud(
struct xfs_trans *tp,
struct xfs_cui_log_item *cuip)
{
struct xfs_cud_log_item *cudp;
cudp = xfs_cud_init(tp->t_mountp, cuip);
xfs_trans_add_item(tp, &cudp->cud_item);
return cudp;
}
/*
* Finish an refcount update and log it to the CUD. Note that the
* transaction is marked dirty regardless of whether the refcount
* update succeeds or fails to support the CUI/CUD lifecycle rules.
*/
int
xfs_trans_log_finish_refcount_update(
struct xfs_trans *tp,
struct xfs_cud_log_item *cudp,
enum xfs_refcount_intent_type type,
xfs_fsblock_t startblock,
xfs_extlen_t blockcount,
struct xfs_btree_cur **pcur)
{
int error;
/* XXX: leave this empty for now */
error = -EFSCORRUPTED;
/*
* Mark the transaction dirty, even on error. This ensures the
* transaction is aborted, which:
*
* 1.) releases the CUI and frees the CUD
* 2.) shuts down the filesystem
*/
tp->t_flags |= XFS_TRANS_DIRTY;
cudp->cud_item.li_desc->lid_flags |= XFS_LID_DIRTY;
return error;
}