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-rw-r--r--arch/x86/include/asm/tsc.h2
-rw-r--r--arch/x86/kernel/tsc.c38
-rw-r--r--arch/x86/power/cpu.c2
-rw-r--r--drivers/xen/events.c21
-rw-r--r--fs/xfs/linux-2.6/xfs_aops.c13
-rw-r--r--fs/xfs/linux-2.6/xfs_super.c9
-rw-r--r--fs/xfs/linux-2.6/xfs_sync.c42
-rw-r--r--fs/xfs/xfs_fsops.c31
-rw-r--r--fs/xfs/xfs_fsops.h2
-rw-r--r--fs/xfs/xfs_ialloc.c16
-rw-r--r--fs/xfs/xfs_inode.c49
-rw-r--r--fs/xfs/xfs_log.c7
-rw-r--r--fs/xfs/xfs_log_cil.c263
-rw-r--r--fs/xfs/xfs_log_priv.h13
-rw-r--r--fs/xfs/xfs_trans.c5
-rw-r--r--fs/xfs/xfs_trans_priv.h3
-rw-r--r--kernel/sched_fair.c2
-rw-r--r--mm/page-writeback.c26
18 files changed, 321 insertions, 223 deletions
diff --git a/arch/x86/include/asm/tsc.h b/arch/x86/include/asm/tsc.h
index c0427295e8f5..1ca132fc0d03 100644
--- a/arch/x86/include/asm/tsc.h
+++ b/arch/x86/include/asm/tsc.h
@@ -59,5 +59,7 @@ extern void check_tsc_sync_source(int cpu);
extern void check_tsc_sync_target(void);
extern int notsc_setup(char *);
+extern void save_sched_clock_state(void);
+extern void restore_sched_clock_state(void);
#endif /* _ASM_X86_TSC_H */
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index ce8e50239332..d632934cb638 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -626,6 +626,44 @@ static void set_cyc2ns_scale(unsigned long cpu_khz, int cpu)
local_irq_restore(flags);
}
+static unsigned long long cyc2ns_suspend;
+
+void save_sched_clock_state(void)
+{
+ if (!sched_clock_stable)
+ return;
+
+ cyc2ns_suspend = sched_clock();
+}
+
+/*
+ * Even on processors with invariant TSC, TSC gets reset in some the
+ * ACPI system sleep states. And in some systems BIOS seem to reinit TSC to
+ * arbitrary value (still sync'd across cpu's) during resume from such sleep
+ * states. To cope up with this, recompute the cyc2ns_offset for each cpu so
+ * that sched_clock() continues from the point where it was left off during
+ * suspend.
+ */
+void restore_sched_clock_state(void)
+{
+ unsigned long long offset;
+ unsigned long flags;
+ int cpu;
+
+ if (!sched_clock_stable)
+ return;
+
+ local_irq_save(flags);
+
+ get_cpu_var(cyc2ns_offset) = 0;
+ offset = cyc2ns_suspend - sched_clock();
+
+ for_each_possible_cpu(cpu)
+ per_cpu(cyc2ns_offset, cpu) = offset;
+
+ local_irq_restore(flags);
+}
+
#ifdef CONFIG_CPU_FREQ
/* Frequency scaling support. Adjust the TSC based timer when the cpu frequency
diff --git a/arch/x86/power/cpu.c b/arch/x86/power/cpu.c
index e7e8c5f54956..87bb35e34ef1 100644
--- a/arch/x86/power/cpu.c
+++ b/arch/x86/power/cpu.c
@@ -113,6 +113,7 @@ static void __save_processor_state(struct saved_context *ctxt)
void save_processor_state(void)
{
__save_processor_state(&saved_context);
+ save_sched_clock_state();
}
#ifdef CONFIG_X86_32
EXPORT_SYMBOL(save_processor_state);
@@ -229,6 +230,7 @@ static void __restore_processor_state(struct saved_context *ctxt)
void restore_processor_state(void)
{
__restore_processor_state(&saved_context);
+ restore_sched_clock_state();
}
#ifdef CONFIG_X86_32
EXPORT_SYMBOL(restore_processor_state);
diff --git a/drivers/xen/events.c b/drivers/xen/events.c
index 72f91bff29c7..13365ba35218 100644
--- a/drivers/xen/events.c
+++ b/drivers/xen/events.c
@@ -112,6 +112,7 @@ static inline unsigned long *cpu_evtchn_mask(int cpu)
#define VALID_EVTCHN(chn) ((chn) != 0)
static struct irq_chip xen_dynamic_chip;
+static struct irq_chip xen_percpu_chip;
/* Constructor for packed IRQ information. */
static struct irq_info mk_unbound_info(void)
@@ -377,7 +378,7 @@ int bind_evtchn_to_irq(unsigned int evtchn)
irq = find_unbound_irq();
set_irq_chip_and_handler_name(irq, &xen_dynamic_chip,
- handle_level_irq, "event");
+ handle_edge_irq, "event");
evtchn_to_irq[evtchn] = irq;
irq_info[irq] = mk_evtchn_info(evtchn);
@@ -403,8 +404,8 @@ static int bind_ipi_to_irq(unsigned int ipi, unsigned int cpu)
if (irq < 0)
goto out;
- set_irq_chip_and_handler_name(irq, &xen_dynamic_chip,
- handle_level_irq, "ipi");
+ set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
+ handle_percpu_irq, "ipi");
bind_ipi.vcpu = cpu;
if (HYPERVISOR_event_channel_op(EVTCHNOP_bind_ipi,
@@ -444,8 +445,8 @@ static int bind_virq_to_irq(unsigned int virq, unsigned int cpu)
irq = find_unbound_irq();
- set_irq_chip_and_handler_name(irq, &xen_dynamic_chip,
- handle_level_irq, "virq");
+ set_irq_chip_and_handler_name(irq, &xen_percpu_chip,
+ handle_percpu_irq, "virq");
evtchn_to_irq[evtchn] = irq;
irq_info[irq] = mk_virq_info(evtchn, virq);
@@ -964,6 +965,16 @@ static struct irq_chip xen_dynamic_chip __read_mostly = {
.retrigger = retrigger_dynirq,
};
+static struct irq_chip xen_percpu_chip __read_mostly = {
+ .name = "xen-percpu",
+
+ .disable = disable_dynirq,
+ .mask = disable_dynirq,
+ .unmask = enable_dynirq,
+
+ .ack = ack_dynirq,
+};
+
int xen_set_callback_via(uint64_t via)
{
struct xen_hvm_param a;
diff --git a/fs/xfs/linux-2.6/xfs_aops.c b/fs/xfs/linux-2.6/xfs_aops.c
index 15412fe15c3a..b552f816de15 100644
--- a/fs/xfs/linux-2.6/xfs_aops.c
+++ b/fs/xfs/linux-2.6/xfs_aops.c
@@ -852,8 +852,8 @@ xfs_convert_page(
SetPageUptodate(page);
if (count) {
- wbc->nr_to_write--;
- if (wbc->nr_to_write <= 0)
+ if (--wbc->nr_to_write <= 0 &&
+ wbc->sync_mode == WB_SYNC_NONE)
done = 1;
}
xfs_start_page_writeback(page, !page_dirty, count);
@@ -1068,7 +1068,7 @@ xfs_vm_writepage(
* by themselves.
*/
if ((current->flags & (PF_MEMALLOC|PF_KSWAPD)) == PF_MEMALLOC)
- goto out_fail;
+ goto redirty;
/*
* We need a transaction if there are delalloc or unwritten buffers
@@ -1080,7 +1080,7 @@ xfs_vm_writepage(
*/
xfs_count_page_state(page, &delalloc, &unwritten);
if ((current->flags & PF_FSTRANS) && (delalloc || unwritten))
- goto out_fail;
+ goto redirty;
/* Is this page beyond the end of the file? */
offset = i_size_read(inode);
@@ -1245,12 +1245,15 @@ error:
if (iohead)
xfs_cancel_ioend(iohead);
+ if (err == -EAGAIN)
+ goto redirty;
+
xfs_aops_discard_page(page);
ClearPageUptodate(page);
unlock_page(page);
return err;
-out_fail:
+redirty:
redirty_page_for_writepage(wbc, page);
unlock_page(page);
return 0;
diff --git a/fs/xfs/linux-2.6/xfs_super.c b/fs/xfs/linux-2.6/xfs_super.c
index 15c35b62ff14..a4e07974955b 100644
--- a/fs/xfs/linux-2.6/xfs_super.c
+++ b/fs/xfs/linux-2.6/xfs_super.c
@@ -1226,6 +1226,7 @@ xfs_fs_statfs(
struct xfs_inode *ip = XFS_I(dentry->d_inode);
__uint64_t fakeinos, id;
xfs_extlen_t lsize;
+ __int64_t ffree;
statp->f_type = XFS_SB_MAGIC;
statp->f_namelen = MAXNAMELEN - 1;
@@ -1249,7 +1250,11 @@ xfs_fs_statfs(
statp->f_files = min_t(typeof(statp->f_files),
statp->f_files,
mp->m_maxicount);
- statp->f_ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
+
+ /* make sure statp->f_ffree does not underflow */
+ ffree = statp->f_files - (sbp->sb_icount - sbp->sb_ifree);
+ statp->f_ffree = max_t(__int64_t, ffree, 0);
+
spin_unlock(&mp->m_sb_lock);
if ((ip->i_d.di_flags & XFS_DIFLAG_PROJINHERIT) ||
@@ -1402,7 +1407,7 @@ xfs_fs_freeze(
xfs_save_resvblks(mp);
xfs_quiesce_attr(mp);
- return -xfs_fs_log_dummy(mp);
+ return -xfs_fs_log_dummy(mp, SYNC_WAIT);
}
STATIC int
diff --git a/fs/xfs/linux-2.6/xfs_sync.c b/fs/xfs/linux-2.6/xfs_sync.c
index dfcbd98d1599..d59c4a65d492 100644
--- a/fs/xfs/linux-2.6/xfs_sync.c
+++ b/fs/xfs/linux-2.6/xfs_sync.c
@@ -34,6 +34,7 @@
#include "xfs_inode_item.h"
#include "xfs_quota.h"
#include "xfs_trace.h"
+#include "xfs_fsops.h"
#include <linux/kthread.h>
#include <linux/freezer.h>
@@ -341,38 +342,6 @@ xfs_sync_attr(
}
STATIC int
-xfs_commit_dummy_trans(
- struct xfs_mount *mp,
- uint flags)
-{
- struct xfs_inode *ip = mp->m_rootip;
- struct xfs_trans *tp;
- int error;
-
- /*
- * Put a dummy transaction in the log to tell recovery
- * that all others are OK.
- */
- tp = xfs_trans_alloc(mp, XFS_TRANS_DUMMY1);
- error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0);
- if (error) {
- xfs_trans_cancel(tp, 0);
- return error;
- }
-
- xfs_ilock(ip, XFS_ILOCK_EXCL);
-
- xfs_trans_ijoin(tp, ip);
- xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
- error = xfs_trans_commit(tp, 0);
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
-
- /* the log force ensures this transaction is pushed to disk */
- xfs_log_force(mp, (flags & SYNC_WAIT) ? XFS_LOG_SYNC : 0);
- return error;
-}
-
-STATIC int
xfs_sync_fsdata(
struct xfs_mount *mp)
{
@@ -432,7 +401,7 @@ xfs_quiesce_data(
/* mark the log as covered if needed */
if (xfs_log_need_covered(mp))
- error2 = xfs_commit_dummy_trans(mp, SYNC_WAIT);
+ error2 = xfs_fs_log_dummy(mp, SYNC_WAIT);
/* flush data-only devices */
if (mp->m_rtdev_targp)
@@ -563,7 +532,7 @@ xfs_flush_inodes(
/*
* Every sync period we need to unpin all items, reclaim inodes and sync
* disk quotas. We might need to cover the log to indicate that the
- * filesystem is idle.
+ * filesystem is idle and not frozen.
*/
STATIC void
xfs_sync_worker(
@@ -577,8 +546,9 @@ xfs_sync_worker(
xfs_reclaim_inodes(mp, 0);
/* dgc: errors ignored here */
error = xfs_qm_sync(mp, SYNC_TRYLOCK);
- if (xfs_log_need_covered(mp))
- error = xfs_commit_dummy_trans(mp, 0);
+ if (mp->m_super->s_frozen == SB_UNFROZEN &&
+ xfs_log_need_covered(mp))
+ error = xfs_fs_log_dummy(mp, 0);
}
mp->m_sync_seq++;
wake_up(&mp->m_wait_single_sync_task);
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index dbca5f5c37ba..43b1d5699335 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -604,31 +604,36 @@ out:
return 0;
}
+/*
+ * Dump a transaction into the log that contains no real change. This is needed
+ * to be able to make the log dirty or stamp the current tail LSN into the log
+ * during the covering operation.
+ *
+ * We cannot use an inode here for this - that will push dirty state back up
+ * into the VFS and then periodic inode flushing will prevent log covering from
+ * making progress. Hence we log a field in the superblock instead.
+ */
int
xfs_fs_log_dummy(
- xfs_mount_t *mp)
+ xfs_mount_t *mp,
+ int flags)
{
xfs_trans_t *tp;
- xfs_inode_t *ip;
int error;
tp = _xfs_trans_alloc(mp, XFS_TRANS_DUMMY1, KM_SLEEP);
- error = xfs_trans_reserve(tp, 0, XFS_ICHANGE_LOG_RES(mp), 0, 0, 0);
+ error = xfs_trans_reserve(tp, 0, mp->m_sb.sb_sectsize + 128, 0, 0,
+ XFS_DEFAULT_LOG_COUNT);
if (error) {
xfs_trans_cancel(tp, 0);
return error;
}
- ip = mp->m_rootip;
- xfs_ilock(ip, XFS_ILOCK_EXCL);
-
- xfs_trans_ijoin(tp, ip);
- xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
- xfs_trans_set_sync(tp);
- error = xfs_trans_commit(tp, 0);
-
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- return error;
+ /* log the UUID because it is an unchanging field */
+ xfs_mod_sb(tp, XFS_SB_UUID);
+ if (flags & SYNC_WAIT)
+ xfs_trans_set_sync(tp);
+ return xfs_trans_commit(tp, 0);
}
int
diff --git a/fs/xfs/xfs_fsops.h b/fs/xfs/xfs_fsops.h
index 88435e0a77c9..a786c5212c1e 100644
--- a/fs/xfs/xfs_fsops.h
+++ b/fs/xfs/xfs_fsops.h
@@ -25,6 +25,6 @@ extern int xfs_fs_counts(xfs_mount_t *mp, xfs_fsop_counts_t *cnt);
extern int xfs_reserve_blocks(xfs_mount_t *mp, __uint64_t *inval,
xfs_fsop_resblks_t *outval);
extern int xfs_fs_goingdown(xfs_mount_t *mp, __uint32_t inflags);
-extern int xfs_fs_log_dummy(xfs_mount_t *mp);
+extern int xfs_fs_log_dummy(xfs_mount_t *mp, int flags);
#endif /* __XFS_FSOPS_H__ */
diff --git a/fs/xfs/xfs_ialloc.c b/fs/xfs/xfs_ialloc.c
index abf80ae1e95b..5371d2dc360e 100644
--- a/fs/xfs/xfs_ialloc.c
+++ b/fs/xfs/xfs_ialloc.c
@@ -1213,7 +1213,6 @@ xfs_imap_lookup(
struct xfs_inobt_rec_incore rec;
struct xfs_btree_cur *cur;
struct xfs_buf *agbp;
- xfs_agino_t startino;
int error;
int i;
@@ -1227,13 +1226,13 @@ xfs_imap_lookup(
}
/*
- * derive and lookup the exact inode record for the given agino. If the
- * record cannot be found, then it's an invalid inode number and we
- * should abort.
+ * Lookup the inode record for the given agino. If the record cannot be
+ * found, then it's an invalid inode number and we should abort. Once
+ * we have a record, we need to ensure it contains the inode number
+ * we are looking up.
*/
cur = xfs_inobt_init_cursor(mp, tp, agbp, agno);
- startino = agino & ~(XFS_IALLOC_INODES(mp) - 1);
- error = xfs_inobt_lookup(cur, startino, XFS_LOOKUP_EQ, &i);
+ error = xfs_inobt_lookup(cur, agino, XFS_LOOKUP_LE, &i);
if (!error) {
if (i)
error = xfs_inobt_get_rec(cur, &rec, &i);
@@ -1246,6 +1245,11 @@ xfs_imap_lookup(
if (error)
return error;
+ /* check that the returned record contains the required inode */
+ if (rec.ir_startino > agino ||
+ rec.ir_startino + XFS_IALLOC_INODES(mp) <= agino)
+ return EINVAL;
+
/* for untrusted inodes check it is allocated first */
if ((flags & XFS_IGET_UNTRUSTED) &&
(rec.ir_free & XFS_INOBT_MASK(agino - rec.ir_startino)))
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 68415cb4f23c..34798f391c49 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1914,6 +1914,11 @@ xfs_iunlink_remove(
return 0;
}
+/*
+ * A big issue when freeing the inode cluster is is that we _cannot_ skip any
+ * inodes that are in memory - they all must be marked stale and attached to
+ * the cluster buffer.
+ */
STATIC void
xfs_ifree_cluster(
xfs_inode_t *free_ip,
@@ -1945,8 +1950,6 @@ xfs_ifree_cluster(
}
for (j = 0; j < nbufs; j++, inum += ninodes) {
- int found = 0;
-
blkno = XFS_AGB_TO_DADDR(mp, XFS_INO_TO_AGNO(mp, inum),
XFS_INO_TO_AGBNO(mp, inum));
@@ -1965,7 +1968,9 @@ xfs_ifree_cluster(
/*
* Walk the inodes already attached to the buffer and mark them
* stale. These will all have the flush locks held, so an
- * in-memory inode walk can't lock them.
+ * in-memory inode walk can't lock them. By marking them all
+ * stale first, we will not attempt to lock them in the loop
+ * below as the XFS_ISTALE flag will be set.
*/
lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *);
while (lip) {
@@ -1977,11 +1982,11 @@ xfs_ifree_cluster(
&iip->ili_flush_lsn,
&iip->ili_item.li_lsn);
xfs_iflags_set(iip->ili_inode, XFS_ISTALE);
- found++;
}
lip = lip->li_bio_list;
}
+
/*
* For each inode in memory attempt to add it to the inode
* buffer and set it up for being staled on buffer IO
@@ -1993,6 +1998,7 @@ xfs_ifree_cluster(
* even trying to lock them.
*/
for (i = 0; i < ninodes; i++) {
+retry:
read_lock(&pag->pag_ici_lock);
ip = radix_tree_lookup(&pag->pag_ici_root,
XFS_INO_TO_AGINO(mp, (inum + i)));
@@ -2003,38 +2009,36 @@ xfs_ifree_cluster(
continue;
}
- /* don't try to lock/unlock the current inode */
+ /*
+ * Don't try to lock/unlock the current inode, but we
+ * _cannot_ skip the other inodes that we did not find
+ * in the list attached to the buffer and are not
+ * already marked stale. If we can't lock it, back off
+ * and retry.
+ */
if (ip != free_ip &&
!xfs_ilock_nowait(ip, XFS_ILOCK_EXCL)) {
read_unlock(&pag->pag_ici_lock);
- continue;
+ delay(1);
+ goto retry;
}
read_unlock(&pag->pag_ici_lock);
- if (!xfs_iflock_nowait(ip)) {
- if (ip != free_ip)
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- continue;
- }
-
+ xfs_iflock(ip);
xfs_iflags_set(ip, XFS_ISTALE);
- if (xfs_inode_clean(ip)) {
- ASSERT(ip != free_ip);
- xfs_ifunlock(ip);
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- continue;
- }
+ /*
+ * we don't need to attach clean inodes or those only
+ * with unlogged changes (which we throw away, anyway).
+ */
iip = ip->i_itemp;
- if (!iip) {
- /* inode with unlogged changes only */
+ if (!iip || xfs_inode_clean(ip)) {
ASSERT(ip != free_ip);
ip->i_update_core = 0;
xfs_ifunlock(ip);
xfs_iunlock(ip, XFS_ILOCK_EXCL);
continue;
}
- found++;
iip->ili_last_fields = iip->ili_format.ilf_fields;
iip->ili_format.ilf_fields = 0;
@@ -2049,8 +2053,7 @@ xfs_ifree_cluster(
xfs_iunlock(ip, XFS_ILOCK_EXCL);
}
- if (found)
- xfs_trans_stale_inode_buf(tp, bp);
+ xfs_trans_stale_inode_buf(tp, bp);
xfs_trans_binval(tp, bp);
}
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index 925d572bf0f4..33f718f92a48 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -3015,7 +3015,8 @@ _xfs_log_force(
XFS_STATS_INC(xs_log_force);
- xlog_cil_push(log, 1);
+ if (log->l_cilp)
+ xlog_cil_force(log);
spin_lock(&log->l_icloglock);
@@ -3167,7 +3168,7 @@ _xfs_log_force_lsn(
XFS_STATS_INC(xs_log_force);
if (log->l_cilp) {
- lsn = xlog_cil_push_lsn(log, lsn);
+ lsn = xlog_cil_force_lsn(log, lsn);
if (lsn == NULLCOMMITLSN)
return 0;
}
@@ -3724,7 +3725,7 @@ xfs_log_force_umount(
* call below.
*/
if (!logerror && (mp->m_flags & XFS_MOUNT_DELAYLOG))
- xlog_cil_push(log, 1);
+ xlog_cil_force(log);
/*
* We must hold both the GRANT lock and the LOG lock,
diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index 31e4ea2d19ac..ed575fb4b495 100644
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -68,6 +68,7 @@ xlog_cil_init(
ctx->sequence = 1;
ctx->cil = cil;
cil->xc_ctx = ctx;
+ cil->xc_current_sequence = ctx->sequence;
cil->xc_log = log;
log->l_cilp = cil;
@@ -269,15 +270,10 @@ xlog_cil_insert(
static void
xlog_cil_format_items(
struct log *log,
- struct xfs_log_vec *log_vector,
- struct xlog_ticket *ticket,
- xfs_lsn_t *start_lsn)
+ struct xfs_log_vec *log_vector)
{
struct xfs_log_vec *lv;
- if (start_lsn)
- *start_lsn = log->l_cilp->xc_ctx->sequence;
-
ASSERT(log_vector);
for (lv = log_vector; lv; lv = lv->lv_next) {
void *ptr;
@@ -301,9 +297,24 @@ xlog_cil_format_items(
ptr += vec->i_len;
}
ASSERT(ptr == lv->lv_buf + lv->lv_buf_len);
+ }
+}
+
+static void
+xlog_cil_insert_items(
+ struct log *log,
+ struct xfs_log_vec *log_vector,
+ struct xlog_ticket *ticket,
+ xfs_lsn_t *start_lsn)
+{
+ struct xfs_log_vec *lv;
+
+ if (start_lsn)
+ *start_lsn = log->l_cilp->xc_ctx->sequence;
+ ASSERT(log_vector);
+ for (lv = log_vector; lv; lv = lv->lv_next)
xlog_cil_insert(log, ticket, lv->lv_item, lv);
- }
}
static void
@@ -321,80 +332,6 @@ xlog_cil_free_logvec(
}
/*
- * Commit a transaction with the given vector to the Committed Item List.
- *
- * To do this, we need to format the item, pin it in memory if required and
- * account for the space used by the transaction. Once we have done that we
- * need to release the unused reservation for the transaction, attach the
- * transaction to the checkpoint context so we carry the busy extents through
- * to checkpoint completion, and then unlock all the items in the transaction.
- *
- * For more specific information about the order of operations in
- * xfs_log_commit_cil() please refer to the comments in
- * xfs_trans_commit_iclog().
- *
- * Called with the context lock already held in read mode to lock out
- * background commit, returns without it held once background commits are
- * allowed again.
- */
-int
-xfs_log_commit_cil(
- struct xfs_mount *mp,
- struct xfs_trans *tp,
- struct xfs_log_vec *log_vector,
- xfs_lsn_t *commit_lsn,
- int flags)
-{
- struct log *log = mp->m_log;
- int log_flags = 0;
- int push = 0;
-
- if (flags & XFS_TRANS_RELEASE_LOG_RES)
- log_flags = XFS_LOG_REL_PERM_RESERV;
-
- if (XLOG_FORCED_SHUTDOWN(log)) {
- xlog_cil_free_logvec(log_vector);
- return XFS_ERROR(EIO);
- }
-
- /* lock out background commit */
- down_read(&log->l_cilp->xc_ctx_lock);
- xlog_cil_format_items(log, log_vector, tp->t_ticket, commit_lsn);
-
- /* check we didn't blow the reservation */
- if (tp->t_ticket->t_curr_res < 0)
- xlog_print_tic_res(log->l_mp, tp->t_ticket);
-
- /* attach the transaction to the CIL if it has any busy extents */
- if (!list_empty(&tp->t_busy)) {
- spin_lock(&log->l_cilp->xc_cil_lock);
- list_splice_init(&tp->t_busy,
- &log->l_cilp->xc_ctx->busy_extents);
- spin_unlock(&log->l_cilp->xc_cil_lock);
- }
-
- tp->t_commit_lsn = *commit_lsn;
- xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
- xfs_trans_unreserve_and_mod_sb(tp);
-
- /* check for background commit before unlock */
- if (log->l_cilp->xc_ctx->space_used > XLOG_CIL_SPACE_LIMIT(log))
- push = 1;
- up_read(&log->l_cilp->xc_ctx_lock);
-
- /*
- * We need to push CIL every so often so we don't cache more than we
- * can fit in the log. The limit really is that a checkpoint can't be
- * more than half the log (the current checkpoint is not allowed to
- * overwrite the previous checkpoint), but commit latency and memory
- * usage limit this to a smaller size in most cases.
- */
- if (push)
- xlog_cil_push(log, 0);
- return 0;
-}
-
-/*
* Mark all items committed and clear busy extents. We free the log vector
* chains in a separate pass so that we unpin the log items as quickly as
* possible.
@@ -427,13 +364,23 @@ xlog_cil_committed(
}
/*
- * Push the Committed Item List to the log. If the push_now flag is not set,
- * then it is a background flush and so we can chose to ignore it.
+ * Push the Committed Item List to the log. If @push_seq flag is zero, then it
+ * is a background flush and so we can chose to ignore it. Otherwise, if the
+ * current sequence is the same as @push_seq we need to do a flush. If
+ * @push_seq is less than the current sequence, then it has already been
+ * flushed and we don't need to do anything - the caller will wait for it to
+ * complete if necessary.
+ *
+ * @push_seq is a value rather than a flag because that allows us to do an
+ * unlocked check of the sequence number for a match. Hence we can allows log
+ * forces to run racily and not issue pushes for the same sequence twice. If we
+ * get a race between multiple pushes for the same sequence they will block on
+ * the first one and then abort, hence avoiding needless pushes.
*/
-int
+STATIC int
xlog_cil_push(
struct log *log,
- int push_now)
+ xfs_lsn_t push_seq)
{
struct xfs_cil *cil = log->l_cilp;
struct xfs_log_vec *lv;
@@ -453,12 +400,14 @@ xlog_cil_push(
if (!cil)
return 0;
+ ASSERT(!push_seq || push_seq <= cil->xc_ctx->sequence);
+
new_ctx = kmem_zalloc(sizeof(*new_ctx), KM_SLEEP|KM_NOFS);
new_ctx->ticket = xlog_cil_ticket_alloc(log);
/* lock out transaction commit, but don't block on background push */
if (!down_write_trylock(&cil->xc_ctx_lock)) {
- if (!push_now)
+ if (!push_seq)
goto out_free_ticket;
down_write(&cil->xc_ctx_lock);
}
@@ -469,7 +418,11 @@ xlog_cil_push(
goto out_skip;
/* check for spurious background flush */
- if (!push_now && cil->xc_ctx->space_used < XLOG_CIL_SPACE_LIMIT(log))
+ if (!push_seq && cil->xc_ctx->space_used < XLOG_CIL_SPACE_LIMIT(log))
+ goto out_skip;
+
+ /* check for a previously pushed seqeunce */
+ if (push_seq < cil->xc_ctx->sequence)
goto out_skip;
/*
@@ -515,6 +468,13 @@ xlog_cil_push(
cil->xc_ctx = new_ctx;
/*
+ * mirror the new sequence into the cil structure so that we can do
+ * unlocked checks against the current sequence in log forces without
+ * risking deferencing a freed context pointer.
+ */
+ cil->xc_current_sequence = new_ctx->sequence;
+
+ /*
* The switch is now done, so we can drop the context lock and move out
* of a shared context. We can't just go straight to the commit record,
* though - we need to synchronise with previous and future commits so
@@ -626,6 +586,102 @@ out_abort:
}
/*
+ * Commit a transaction with the given vector to the Committed Item List.
+ *
+ * To do this, we need to format the item, pin it in memory if required and
+ * account for the space used by the transaction. Once we have done that we
+ * need to release the unused reservation for the transaction, attach the
+ * transaction to the checkpoint context so we carry the busy extents through
+ * to checkpoint completion, and then unlock all the items in the transaction.
+ *
+ * For more specific information about the order of operations in
+ * xfs_log_commit_cil() please refer to the comments in
+ * xfs_trans_commit_iclog().
+ *
+ * Called with the context lock already held in read mode to lock out
+ * background commit, returns without it held once background commits are
+ * allowed again.
+ */
+int
+xfs_log_commit_cil(
+ struct xfs_mount *mp,
+ struct xfs_trans *tp,
+ struct xfs_log_vec *log_vector,
+ xfs_lsn_t *commit_lsn,
+ int flags)
+{
+ struct log *log = mp->m_log;
+ int log_flags = 0;
+ int push = 0;
+
+ if (flags & XFS_TRANS_RELEASE_LOG_RES)
+ log_flags = XFS_LOG_REL_PERM_RESERV;
+
+ if (XLOG_FORCED_SHUTDOWN(log)) {
+ xlog_cil_free_logvec(log_vector);
+ return XFS_ERROR(EIO);
+ }
+
+ /*
+ * do all the hard work of formatting items (including memory
+ * allocation) outside the CIL context lock. This prevents stalling CIL
+ * pushes when we are low on memory and a transaction commit spends a
+ * lot of time in memory reclaim.
+ */
+ xlog_cil_format_items(log, log_vector);
+
+ /* lock out background commit */
+ down_read(&log->l_cilp->xc_ctx_lock);
+ xlog_cil_insert_items(log, log_vector, tp->t_ticket, commit_lsn);
+
+ /* check we didn't blow the reservation */
+ if (tp->t_ticket->t_curr_res < 0)
+ xlog_print_tic_res(log->l_mp, tp->t_ticket);
+
+ /* attach the transaction to the CIL if it has any busy extents */
+ if (!list_empty(&tp->t_busy)) {
+ spin_lock(&log->l_cilp->xc_cil_lock);
+ list_splice_init(&tp->t_busy,
+ &log->l_cilp->xc_ctx->busy_extents);
+ spin_unlock(&log->l_cilp->xc_cil_lock);
+ }
+
+ tp->t_commit_lsn = *commit_lsn;
+ xfs_log_done(mp, tp->t_ticket, NULL, log_flags);
+ xfs_trans_unreserve_and_mod_sb(tp);
+
+ /*
+ * Once all the items of the transaction have been copied to the CIL,
+ * the items can be unlocked and freed.
+ *
+ * This needs to be done before we drop the CIL context lock because we
+ * have to update state in the log items and unlock them before they go
+ * to disk. If we don't, then the CIL checkpoint can race with us and
+ * we can run checkpoint completion before we've updated and unlocked
+ * the log items. This affects (at least) processing of stale buffers,
+ * inodes and EFIs.
+ */
+ xfs_trans_free_items(tp, *commit_lsn, 0);
+
+ /* check for background commit before unlock */
+ if (log->l_cilp->xc_ctx->space_used > XLOG_CIL_SPACE_LIMIT(log))
+ push = 1;
+
+ up_read(&log->l_cilp->xc_ctx_lock);
+
+ /*
+ * We need to push CIL every so often so we don't cache more than we
+ * can fit in the log. The limit really is that a checkpoint can't be
+ * more than half the log (the current checkpoint is not allowed to
+ * overwrite the previous checkpoint), but commit latency and memory
+ * usage limit this to a smaller size in most cases.
+ */
+ if (push)
+ xlog_cil_push(log, 0);
+ return 0;
+}
+
+/*
* Conditionally push the CIL based on the sequence passed in.
*
* We only need to push if we haven't already pushed the sequence
@@ -639,39 +695,34 @@ out_abort:
* commit lsn is there. It'll be empty, so this is broken for now.
*/
xfs_lsn_t
-xlog_cil_push_lsn(
+xlog_cil_force_lsn(
struct log *log,
- xfs_lsn_t push_seq)
+ xfs_lsn_t sequence)
{
struct xfs_cil *cil = log->l_cilp;
struct xfs_cil_ctx *ctx;
xfs_lsn_t commit_lsn = NULLCOMMITLSN;
-restart:
- down_write(&cil->xc_ctx_lock);
- ASSERT(push_seq <= cil->xc_ctx->sequence);
-
- /* check to see if we need to force out the current context */
- if (push_seq == cil->xc_ctx->sequence) {
- up_write(&cil->xc_ctx_lock);
- xlog_cil_push(log, 1);
- goto restart;
- }
+ ASSERT(sequence <= cil->xc_current_sequence);
+
+ /*
+ * check to see if we need to force out the current context.
+ * xlog_cil_push() handles racing pushes for the same sequence,
+ * so no need to deal with it here.
+ */
+ if (sequence == cil->xc_current_sequence)
+ xlog_cil_push(log, sequence);
/*
* See if we can find a previous sequence still committing.
- * We can drop the flush lock as soon as we have the cil lock
- * because we are now only comparing contexts protected by
- * the cil lock.
- *
* We need to wait for all previous sequence commits to complete
* before allowing the force of push_seq to go ahead. Hence block
* on commits for those as well.
*/
+restart:
spin_lock(&cil->xc_cil_lock);
- up_write(&cil->xc_ctx_lock);
list_for_each_entry(ctx, &cil->xc_committing, committing) {
- if (ctx->sequence > push_seq)
+ if (ctx->sequence > sequence)
continue;
if (!ctx->commit_lsn) {
/*
@@ -681,7 +732,7 @@ restart:
sv_wait(&cil->xc_commit_wait, 0, &cil->xc_cil_lock, 0);
goto restart;
}
- if (ctx->sequence != push_seq)
+ if (ctx->sequence != sequence)
continue;
/* found it! */
commit_lsn = ctx->commit_lsn;
diff --git a/fs/xfs/xfs_log_priv.h b/fs/xfs/xfs_log_priv.h
index 8c072618965c..ced52b98b322 100644
--- a/fs/xfs/xfs_log_priv.h
+++ b/fs/xfs/xfs_log_priv.h
@@ -422,6 +422,7 @@ struct xfs_cil {
struct rw_semaphore xc_ctx_lock;
struct list_head xc_committing;
sv_t xc_commit_wait;
+ xfs_lsn_t xc_current_sequence;
};
/*
@@ -562,8 +563,16 @@ int xlog_cil_init(struct log *log);
void xlog_cil_init_post_recovery(struct log *log);
void xlog_cil_destroy(struct log *log);
-int xlog_cil_push(struct log *log, int push_now);
-xfs_lsn_t xlog_cil_push_lsn(struct log *log, xfs_lsn_t push_sequence);
+/*
+ * CIL force routines
+ */
+xfs_lsn_t xlog_cil_force_lsn(struct log *log, xfs_lsn_t sequence);
+
+static inline void
+xlog_cil_force(struct log *log)
+{
+ xlog_cil_force_lsn(log, log->l_cilp->xc_current_sequence);
+}
/*
* Unmount record type is used as a pseudo transaction type for the ticket.
diff --git a/fs/xfs/xfs_trans.c b/fs/xfs/xfs_trans.c
index fdca7416c754..1c47edaea0d2 100644
--- a/fs/xfs/xfs_trans.c
+++ b/fs/xfs/xfs_trans.c
@@ -1167,7 +1167,7 @@ xfs_trans_del_item(
* Unlock all of the items of a transaction and free all the descriptors
* of that transaction.
*/
-STATIC void
+void
xfs_trans_free_items(
struct xfs_trans *tp,
xfs_lsn_t commit_lsn,
@@ -1653,9 +1653,6 @@ xfs_trans_commit_cil(
return error;
current_restore_flags_nested(&tp->t_pflags, PF_FSTRANS);
-
- /* xfs_trans_free_items() unlocks them first */
- xfs_trans_free_items(tp, *commit_lsn, 0);
xfs_trans_free(tp);
return 0;
}
diff --git a/fs/xfs/xfs_trans_priv.h b/fs/xfs/xfs_trans_priv.h
index e2d93d8ead7b..62da86c90de5 100644
--- a/fs/xfs/xfs_trans_priv.h
+++ b/fs/xfs/xfs_trans_priv.h
@@ -25,7 +25,8 @@ struct xfs_trans;
void xfs_trans_add_item(struct xfs_trans *, struct xfs_log_item *);
void xfs_trans_del_item(struct xfs_log_item *);
-
+void xfs_trans_free_items(struct xfs_trans *tp, xfs_lsn_t commit_lsn,
+ int flags);
void xfs_trans_item_committed(struct xfs_log_item *lip,
xfs_lsn_t commit_lsn, int aborted);
void xfs_trans_unreserve_and_mod_sb(struct xfs_trans *tp);
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c
index 806d1b227a21..ab661ebc4895 100644
--- a/kernel/sched_fair.c
+++ b/kernel/sched_fair.c
@@ -3752,6 +3752,8 @@ static void task_fork_fair(struct task_struct *p)
raw_spin_lock_irqsave(&rq->lock, flags);
+ update_rq_clock(rq);
+
if (unlikely(task_cpu(p) != this_cpu))
__set_task_cpu(p, this_cpu);
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index c09ef5219cbe..a803f5e33471 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -985,22 +985,16 @@ continue_unlock:
}
}
- if (wbc->nr_to_write > 0) {
- if (--wbc->nr_to_write == 0 &&
- wbc->sync_mode == WB_SYNC_NONE) {
- /*
- * We stop writing back only if we are
- * not doing integrity sync. In case of
- * integrity sync we have to keep going
- * because someone may be concurrently
- * dirtying pages, and we might have
- * synced a lot of newly appeared dirty
- * pages, but have not synced all of the
- * old dirty pages.
- */
- done = 1;
- break;
- }
+ /*
+ * We stop writing back only if we are not doing
+ * integrity sync. In case of integrity sync we have to
+ * keep going until we have written all the pages
+ * we tagged for writeback prior to entering this loop.
+ */
+ if (--wbc->nr_to_write <= 0 &&
+ wbc->sync_mode == WB_SYNC_NONE) {
+ done = 1;
+ break;
}
}
pagevec_release(&pvec);

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