[PATCH 102/119] xfs: garbage collect old cowextsz reservations

Darrick J. Wong
2016-06-17T01:29:02Z

Trim CoW reservations made on behalf of a cowextsz hint if they get too
old or we run low on quota, so long as we don't have dirty data awaiting
writeback or directio operations in progress.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
---
fs/xfs/xfs_bmap_util.c | 3 +
fs/xfs/xfs_file.c | 3 +
fs/xfs/xfs_globals.c | 5 +
fs/xfs/xfs_icache.c | 238 ++++++++++++++++++++++++++++++++++++++++++------
fs/xfs/xfs_icache.h | 7 +
fs/xfs/xfs_inode.c | 4 +
fs/xfs/xfs_iomap.c | 2
fs/xfs/xfs_linux.h | 1
fs/xfs/xfs_mount.c | 1
fs/xfs/xfs_mount.h | 2
fs/xfs/xfs_reflink.c | 35 +++++++
fs/xfs/xfs_reflink.h | 2
fs/xfs/xfs_super.c | 1
fs/xfs/xfs_sysctl.c | 9 ++
fs/xfs/xfs_sysctl.h | 1
fs/xfs/xfs_trace.h | 5 +
16 files changed, 287 insertions(+), 32 deletions(-)

diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index b0c2c6d5..584f276 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -1222,6 +1222,7 @@ xfs_free_cow_space(
*/
if (ip->i_d.di_nblocks == 0) {
ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK;
+ xfs_inode_clear_cowblocks_tag(ip);
xfs_trans_log_inode(*tpp, ip, XFS_ILOG_CORE);
}
out:
@@ -1966,6 +1967,8 @@ xfs_swap_extents(
cowfp = ip->i_cowfp;
ip->i_cowfp = tip->i_cowfp;
tip->i_cowfp = cowfp;
+ xfs_inode_set_cowblocks_tag(ip);
+ xfs_inode_set_cowblocks_tag(tip);
}

xfs_trans_log_inode(tp, ip, src_log_flags);
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 618bd12..ad6a467 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -859,6 +859,9 @@ write_retry:
enospc = xfs_inode_free_quota_eofblocks(ip);
if (enospc)
goto write_retry;
+ enospc = xfs_inode_free_quota_cowblocks(ip);
+ if (enospc)
+ goto write_retry;
} else if (ret == -ENOSPC && !enospc) {
struct xfs_eofblocks eofb = {0};

diff --git a/fs/xfs/xfs_globals.c b/fs/xfs/xfs_globals.c
index 4d41b24..f3f6aa9 100644
--- a/fs/xfs/xfs_globals.c
+++ b/fs/xfs/xfs_globals.c
@@ -21,8 +21,8 @@
/*
* Tunable XFS parameters. xfs_params is required even when CONFIG_SYSCTL=n,
* other XFS code uses these values. Times are measured in centisecs (i.e.
- * 100ths of a second) with the exception of eofb_timer, which is measured in
- * seconds.
+ * 100ths of a second) with the exception of eofb_timer and cowb_timer, which
+ * are measured in seconds.
*/
xfs_param_t xfs_params = {
/* MIN DFLT MAX */
@@ -42,6 +42,7 @@ xfs_param_t xfs_params = {
.inherit_nodfrg = { 0, 1, 1 },
.fstrm_timer = { 1, 30*100, 3600*100},
.eofb_timer = { 1, 300, 3600*24},
+ .cowb_timer = { 1, 300, 3600*24},
};

struct xfs_globals xfs_globals = {
diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index 06f3b8c..884b570 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -33,6 +33,7 @@
#include "xfs_bmap_util.h"
#include "xfs_dquot_item.h"
#include "xfs_dquot.h"
+#include "xfs_reflink.h"

#include <linux/kthread.h>
#include <linux/freezer.h>
@@ -792,6 +793,33 @@ xfs_eofblocks_worker(
xfs_queue_eofblocks(mp);
}

+/*
+ * Background scanning to trim preallocated CoW space. This is queued
+ * based on the 'speculative_cow_prealloc_lifetime' tunable (5m by default).
+ * (We'll just piggyback on the post-EOF prealloc space workqueue.)
+ */
+STATIC void
+xfs_queue_cowblocks(
+ struct xfs_mount *mp)
+{
+ rcu_read_lock();
+ if (radix_tree_tagged(&mp->m_perag_tree, XFS_ICI_COWBLOCKS_TAG))
+ queue_delayed_work(mp->m_eofblocks_workqueue,
+ &mp->m_cowblocks_work,
+ msecs_to_jiffies(xfs_cowb_secs * 1000));
+ rcu_read_unlock();
+}
+
+void
+xfs_cowblocks_worker(
+ struct work_struct *work)
+{
+ struct xfs_mount *mp = container_of(to_delayed_work(work),
+ struct xfs_mount, m_cowblocks_work);
+ xfs_icache_free_cowblocks(mp, NULL);
+ xfs_queue_cowblocks(mp);
+}
+
int
xfs_inode_ag_iterator(
struct xfs_mount *mp,
@@ -1348,18 +1376,30 @@ xfs_inode_free_eofblocks(
return ret;
}

-int
-xfs_icache_free_eofblocks(
+static int
+__xfs_icache_free_eofblocks(
struct xfs_mount *mp,
- struct xfs_eofblocks *eofb)
+ struct xfs_eofblocks *eofb,
+ int (*execute)(struct xfs_inode *ip, int flags,
+ void *args),
+ int tag)
{
int flags = SYNC_TRYLOCK;

if (eofb && (eofb->eof_flags & XFS_EOF_FLAGS_SYNC))
flags = SYNC_WAIT;

- return xfs_inode_ag_iterator_tag(mp, xfs_inode_free_eofblocks, flags,
- eofb, XFS_ICI_EOFBLOCKS_TAG);
+ return xfs_inode_ag_iterator_tag(mp, execute, flags,
+ eofb, tag);
+}
+
+int
+xfs_icache_free_eofblocks(
+ struct xfs_mount *mp,
+ struct xfs_eofblocks *eofb)
+{
+ return __xfs_icache_free_eofblocks(mp, eofb, xfs_inode_free_eofblocks,
+ XFS_ICI_EOFBLOCKS_TAG);
}

/*
@@ -1368,9 +1408,11 @@ xfs_icache_free_eofblocks(
* failure. We make a best effort by including each quota under low free space
* conditions (less than 1% free space) in the scan.
*/
-int
-xfs_inode_free_quota_eofblocks(
- struct xfs_inode *ip)
+static int
+__xfs_inode_free_quota_eofblocks(
+ struct xfs_inode *ip,
+ int (*execute)(struct xfs_mount *mp,
+ struct xfs_eofblocks *eofb))
{
int scan = 0;
struct xfs_eofblocks eofb = {0};
@@ -1406,14 +1448,25 @@ xfs_inode_free_quota_eofblocks(
}

if (scan)
- xfs_icache_free_eofblocks(ip->i_mount, &eofb);
+ execute(ip->i_mount, &eofb);

return scan;
}

-void
-xfs_inode_set_eofblocks_tag(
- xfs_inode_t *ip)
+int
+xfs_inode_free_quota_eofblocks(
+ struct xfs_inode *ip)
+{
+ return __xfs_inode_free_quota_eofblocks(ip, xfs_icache_free_eofblocks);
+}
+
+static void
+__xfs_inode_set_eofblocks_tag(
+ xfs_inode_t *ip,
+ void (*execute)(struct xfs_mount *mp),
+ void (*set_tp)(struct xfs_mount *mp, xfs_agnumber_t agno,
+ int error, unsigned long caller_ip),
+ int tag)
{
struct xfs_mount *mp = ip->i_mount;
struct xfs_perag *pag;
@@ -1421,26 +1474,22 @@ xfs_inode_set_eofblocks_tag(

pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
spin_lock(&pag->pag_ici_lock);
- trace_xfs_inode_set_eofblocks_tag(ip);

- tagged = radix_tree_tagged(&pag->pag_ici_root,
- XFS_ICI_EOFBLOCKS_TAG);
+ tagged = radix_tree_tagged(&pag->pag_ici_root, tag);
radix_tree_tag_set(&pag->pag_ici_root,
- XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino),
- XFS_ICI_EOFBLOCKS_TAG);
+ XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino), tag);
if (!tagged) {
/* propagate the eofblocks tag up into the perag radix tree */
spin_lock(&ip->i_mount->m_perag_lock);
radix_tree_tag_set(&ip->i_mount->m_perag_tree,
XFS_INO_TO_AGNO(ip->i_mount, ip->i_ino),
- XFS_ICI_EOFBLOCKS_TAG);
+ tag);
spin_unlock(&ip->i_mount->m_perag_lock);

/* kick off background trimming */
- xfs_queue_eofblocks(ip->i_mount);
+ execute(ip->i_mount);

- trace_xfs_perag_set_eofblocks(ip->i_mount, pag->pag_agno,
- -1, _RET_IP_);
+ set_tp(ip->i_mount, pag->pag_agno, -1, _RET_IP_);
}

spin_unlock(&pag->pag_ici_lock);
@@ -1448,31 +1497,162 @@ xfs_inode_set_eofblocks_tag(
}

void
-xfs_inode_clear_eofblocks_tag(
+xfs_inode_set_eofblocks_tag(
xfs_inode_t *ip)
{
+ trace_xfs_inode_set_eofblocks_tag(ip);
+ return __xfs_inode_set_eofblocks_tag(ip, xfs_queue_eofblocks,
+ trace_xfs_perag_set_eofblocks,
+ XFS_ICI_EOFBLOCKS_TAG);
+}
+
+static void
+__xfs_inode_clear_eofblocks_tag(
+ xfs_inode_t *ip,
+ void (*clear_tp)(struct xfs_mount *mp, xfs_agnumber_t agno,
+ int error, unsigned long caller_ip),
+ int tag)
+{
struct xfs_mount *mp = ip->i_mount;
struct xfs_perag *pag;

pag = xfs_perag_get(mp, XFS_INO_TO_AGNO(mp, ip->i_ino));
spin_lock(&pag->pag_ici_lock);
- trace_xfs_inode_clear_eofblocks_tag(ip);

radix_tree_tag_clear(&pag->pag_ici_root,
- XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino),
- XFS_ICI_EOFBLOCKS_TAG);
- if (!radix_tree_tagged(&pag->pag_ici_root, XFS_ICI_EOFBLOCKS_TAG)) {
+ XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino), tag);
+ if (!radix_tree_tagged(&pag->pag_ici_root, tag)) {
/* clear the eofblocks tag from the perag radix tree */
spin_lock(&ip->i_mount->m_perag_lock);
radix_tree_tag_clear(&ip->i_mount->m_perag_tree,
XFS_INO_TO_AGNO(ip->i_mount, ip->i_ino),
- XFS_ICI_EOFBLOCKS_TAG);
+ tag);
spin_unlock(&ip->i_mount->m_perag_lock);
- trace_xfs_perag_clear_eofblocks(ip->i_mount, pag->pag_agno,
- -1, _RET_IP_);
+ clear_tp(ip->i_mount, pag->pag_agno, -1, _RET_IP_);
}

spin_unlock(&pag->pag_ici_lock);
xfs_perag_put(pag);
}

+void
+xfs_inode_clear_eofblocks_tag(
+ xfs_inode_t *ip)
+{
+ trace_xfs_inode_clear_eofblocks_tag(ip);
+ return __xfs_inode_clear_eofblocks_tag(ip,
+ trace_xfs_perag_clear_eofblocks, XFS_ICI_EOFBLOCKS_TAG);
+}
+
+/*
+ * Automatic CoW Reservation Freeing
+ *
+ * These functions automatically garbage collect leftover CoW reservations
+ * that were made on behalf of a cowextsize hint when we start to run out
+ * of quota or when the reservations sit around for too long. If the file
+ * has dirty pages or is undergoing writeback, its CoW reservations will
+ * be retained.
+ *
+ * The actual garbage collection piggybacks off the same code that runs
+ * the speculative EOF preallocation garbage collector.
+ */
+STATIC int
+xfs_inode_free_cowblocks(
+ struct xfs_inode *ip,
+ int flags,
+ void *args)
+{
+ int ret;
+ struct xfs_eofblocks *eofb = args;
+ bool need_iolock = true;
+ int match;
+
+ ASSERT(!eofb || (eofb && eofb->eof_scan_owner != 0));
+
+ if (!xfs_reflink_has_real_cow_blocks(ip)) {
+ trace_xfs_inode_free_cowblocks_invalid(ip);
+ xfs_inode_clear_cowblocks_tag(ip);
+ return 0;
+ }
+
+ /*
+ * If the mapping is dirty or under writeback we cannot touch the
+ * CoW fork. Leave it alone if we're in the midst of a directio.
+ */
+ if (mapping_tagged(VFS_I(ip)->i_mapping, PAGECACHE_TAG_DIRTY) ||
+ mapping_tagged(VFS_I(ip)->i_mapping, PAGECACHE_TAG_WRITEBACK) ||
+ atomic_read(&VFS_I(ip)->i_dio_count))
+ return 0;
+
+ if (eofb) {
+ if (eofb->eof_flags & XFS_EOF_FLAGS_UNION)
+ match = xfs_inode_match_id_union(ip, eofb);
+ else
+ match = xfs_inode_match_id(ip, eofb);
+ if (!match)
+ return 0;
+
+ /* skip the inode if the file size is too small */
+ if (eofb->eof_flags & XFS_EOF_FLAGS_MINFILESIZE &&
+ XFS_ISIZE(ip) < eofb->eof_min_file_size)
+ return 0;
+
+ /*
+ * A scan owner implies we already hold the iolock. Skip it in
+ * xfs_free_eofblocks() to avoid deadlock. This also eliminates
+ * the possibility of EAGAIN being returned.
+ */
+ if (eofb->eof_scan_owner == ip->i_ino)
+ need_iolock = false;
+ }
+
+ /* Free the CoW blocks */
+ if (need_iolock) {
+ xfs_ilock(ip, XFS_IOLOCK_EXCL);
+ xfs_ilock(ip, XFS_MMAPLOCK_EXCL);
+ }
+
+ ret = xfs_reflink_cancel_cow_range(ip, 0, NULLFILEOFF);
+
+ if (need_iolock) {
+ xfs_iunlock(ip, XFS_MMAPLOCK_EXCL);
+ xfs_iunlock(ip, XFS_IOLOCK_EXCL);
+ }
+
+ return ret;
+}
+
+int
+xfs_icache_free_cowblocks(
+ struct xfs_mount *mp,
+ struct xfs_eofblocks *eofb)
+{
+ return __xfs_icache_free_eofblocks(mp, eofb, xfs_inode_free_cowblocks,
+ XFS_ICI_COWBLOCKS_TAG);
+}
+
+int
+xfs_inode_free_quota_cowblocks(
+ struct xfs_inode *ip)
+{
+ return __xfs_inode_free_quota_eofblocks(ip, xfs_icache_free_cowblocks);
+}
+
+void
+xfs_inode_set_cowblocks_tag(
+ xfs_inode_t *ip)
+{
+ trace_xfs_inode_set_eofblocks_tag(ip);
+ return __xfs_inode_set_eofblocks_tag(ip, xfs_queue_cowblocks,
+ trace_xfs_perag_set_eofblocks,
+ XFS_ICI_COWBLOCKS_TAG);
+}
+
+void
+xfs_inode_clear_cowblocks_tag(
+ xfs_inode_t *ip)
+{
+ trace_xfs_inode_clear_eofblocks_tag(ip);
+ return __xfs_inode_clear_eofblocks_tag(ip,
+ trace_xfs_perag_clear_eofblocks, XFS_ICI_COWBLOCKS_TAG);
+}
diff --git a/fs/xfs/xfs_icache.h b/fs/xfs/xfs_icache.h
index 62f1f91..a22ac92 100644
--- a/fs/xfs/xfs_icache.h
+++ b/fs/xfs/xfs_icache.h
@@ -40,6 +40,7 @@ struct xfs_eofblocks {
in xfs_inode_ag_iterator */
#define XFS_ICI_RECLAIM_TAG 0 /* inode is to be reclaimed */
#define XFS_ICI_EOFBLOCKS_TAG 1 /* inode has blocks beyond EOF */
+#define XFS_ICI_COWBLOCKS_TAG 2 /* inode can have cow blocks to gc */

/*
* Flags for xfs_iget()
@@ -69,6 +70,12 @@ int xfs_icache_free_eofblocks(struct xfs_mount *, struct xfs_eofblocks *);
int xfs_inode_free_quota_eofblocks(struct xfs_inode *ip);
void xfs_eofblocks_worker(struct work_struct *);

+void xfs_inode_set_cowblocks_tag(struct xfs_inode *ip);
+void xfs_inode_clear_cowblocks_tag(struct xfs_inode *ip);
+int xfs_icache_free_cowblocks(struct xfs_mount *, struct xfs_eofblocks *);
+int xfs_inode_free_quota_cowblocks(struct xfs_inode *ip);
+void xfs_cowblocks_worker(struct work_struct *);
+
int xfs_inode_ag_iterator(struct xfs_mount *mp,
int (*execute)(struct xfs_inode *ip, int flags, void *args),
int flags, void *args);
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index 480e48a..fb9c2d7 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -1631,8 +1631,10 @@ xfs_itruncate_extents(
/*
* Clear the reflink flag if we truncated everything.
*/
- if (ip->i_d.di_nblocks == 0 && xfs_is_reflink_inode(ip))
+ if (ip->i_d.di_nblocks == 0 && xfs_is_reflink_inode(ip)) {
ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK;
+ xfs_inode_clear_cowblocks_tag(ip);
+ }

/*
* Always re-log the inode so that our permanent transaction can keep
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 3914f0f..58240b5 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -668,6 +668,8 @@ retry:
*/
if (prealloc)
xfs_inode_set_eofblocks_tag(ip);
+ if (whichfork == XFS_COW_FORK && extsz > 0)
+ xfs_inode_set_cowblocks_tag(ip);

*ret_imap = imap[0];
return 0;
diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h
index a8192dc..f05e2cf5 100644
--- a/fs/xfs/xfs_linux.h
+++ b/fs/xfs/xfs_linux.h
@@ -116,6 +116,7 @@ typedef __u32 xfs_nlink_t;
#define xfs_inherit_nodefrag xfs_params.inherit_nodfrg.val
#define xfs_fstrm_centisecs xfs_params.fstrm_timer.val
#define xfs_eofb_secs xfs_params.eofb_timer.val
+#define xfs_cowb_secs xfs_params.cowb_timer.val

#define current_cpu() (raw_smp_processor_id())
#define current_pid() (current->pid)
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index db80832..e53853d 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -1015,6 +1015,7 @@ xfs_unmountfs(
int error;

cancel_delayed_work_sync(&mp->m_eofblocks_work);
+ cancel_delayed_work_sync(&mp->m_cowblocks_work);

xfs_fs_unreserve_ag_blocks(mp);
xfs_qm_unmount_quotas(mp);
diff --git a/fs/xfs/xfs_mount.h b/fs/xfs/xfs_mount.h
index a516a1f..6b06d24 100644
--- a/fs/xfs/xfs_mount.h
+++ b/fs/xfs/xfs_mount.h
@@ -158,6 +158,8 @@ typedef struct xfs_mount {
struct delayed_work m_reclaim_work; /* background inode reclaim */
struct delayed_work m_eofblocks_work; /* background eof blocks
trimming */
+ struct delayed_work m_cowblocks_work; /* background cow blocks
+ trimming */
bool m_update_sb; /* sb needs update in mount */
int64_t m_low_space[XFS_LOWSP_MAX];
/* low free space thresholds */
diff --git a/fs/xfs/xfs_reflink.c b/fs/xfs/xfs_reflink.c
index f5195b7..9b14eb5 100644
--- a/fs/xfs/xfs_reflink.c
+++ b/fs/xfs/xfs_reflink.c
@@ -1727,6 +1727,7 @@ next:
/* Clear the inode flag. */
trace_xfs_reflink_unset_inode_flag(ip);
ip->i_d.di_flags2 &= ~XFS_DIFLAG2_REFLINK;
+ xfs_inode_clear_cowblocks_tag(ip);
xfs_trans_ijoin(tp, ip, 0);
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);

@@ -1864,3 +1865,37 @@ xfs_reflink_check_flag_adjust(
}
return 0;
}
+
+/*
+ * Does this inode have any real CoW reservations?
+ */
+bool
+xfs_reflink_has_real_cow_blocks(
+ struct xfs_inode *ip)
+{
+ struct xfs_bmbt_irec irec;
+ struct xfs_ifork *ifp;
+ struct xfs_bmbt_rec_host *gotp;
+ xfs_extnum_t idx;
+
+ if (!xfs_is_reflink_inode(ip))
+ return false;
+
+ /* Go find the old extent in the CoW fork. */
+ ifp = XFS_IFORK_PTR(ip, XFS_COW_FORK);
+ gotp = xfs_iext_bno_to_ext(ifp, 0, &idx);
+ while (gotp) {
+ xfs_bmbt_get_all(gotp, &irec);
+
+ if (!isnullstartblock(irec.br_startblock))
+ return true;
+
+ /* Roll on... */
+ idx++;
+ if (idx >= ifp->if_bytes / sizeof(xfs_bmbt_rec_t))
+ break;
+ gotp = xfs_iext_get_ext(ifp, idx);
+ }
+
+ return false;
+}
diff --git a/fs/xfs/xfs_reflink.h b/fs/xfs/xfs_reflink.h
index 97e8705..12c2bc6 100644
--- a/fs/xfs/xfs_reflink.h
+++ b/fs/xfs/xfs_reflink.h
@@ -56,6 +56,8 @@ extern void xfs_reflink_get_lxflags(struct xfs_inode *ip, unsigned int *flags);
extern int xfs_reflink_check_flag_adjust(struct xfs_inode *ip,
unsigned int *xflags);

+extern bool xfs_reflink_has_real_cow_blocks(struct xfs_inode *ip);
+
/* xfs_aops.c */
extern int xfs_map_cow_blocks(struct inode *inode, xfs_off_t offset,
struct xfs_bmbt_irec *imap);
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 10a0f721..93d159a 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -1504,6 +1504,7 @@ xfs_fs_fill_super(
atomic_set(&mp->m_active_trans, 0);
INIT_DELAYED_WORK(&mp->m_reclaim_work, xfs_reclaim_worker);
INIT_DELAYED_WORK(&mp->m_eofblocks_work, xfs_eofblocks_worker);
+ INIT_DELAYED_WORK(&mp->m_cowblocks_work, xfs_cowblocks_worker);
mp->m_kobj.kobject.kset = xfs_kset;

mp->m_super = sb;
diff --git a/fs/xfs/xfs_sysctl.c b/fs/xfs/xfs_sysctl.c
index aed74d3..afe1f66 100644
--- a/fs/xfs/xfs_sysctl.c
+++ b/fs/xfs/xfs_sysctl.c
@@ -184,6 +184,15 @@ static struct ctl_table xfs_table[] = {
.extra1 = &xfs_params.eofb_timer.min,
.extra2 = &xfs_params.eofb_timer.max,
},
+ {
+ .procname = "speculative_cow_prealloc_lifetime",
+ .data = &xfs_params.cowb_timer.val,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = proc_dointvec_minmax,
+ .extra1 = &xfs_params.cowb_timer.min,
+ .extra2 = &xfs_params.cowb_timer.max,
+ },
/* please keep this the last entry */
#ifdef CONFIG_PROC_FS
{
diff --git a/fs/xfs/xfs_sysctl.h b/fs/xfs/xfs_sysctl.h
index ffef453..984a349 100644
--- a/fs/xfs/xfs_sysctl.h
+++ b/fs/xfs/xfs_sysctl.h
@@ -48,6 +48,7 @@ typedef struct xfs_param {
xfs_sysctl_val_t inherit_nodfrg;/* Inherit the "nodefrag" inode flag. */
xfs_sysctl_val_t fstrm_timer; /* Filestream dir-AG assoc'n timeout. */
xfs_sysctl_val_t eofb_timer; /* Interval between eofb scan wakeups */
+ xfs_sysctl_val_t cowb_timer; /* Interval between cowb scan wakeups */
} xfs_param_t;

/*
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index fe4a5be..1d89f8f 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -136,6 +136,8 @@ DEFINE_PERAG_REF_EVENT(xfs_perag_set_reclaim);
DEFINE_PERAG_REF_EVENT(xfs_perag_clear_reclaim);
DEFINE_PERAG_REF_EVENT(xfs_perag_set_eofblocks);
DEFINE_PERAG_REF_EVENT(xfs_perag_clear_eofblocks);
+DEFINE_PERAG_REF_EVENT(xfs_perag_set_cowblocks);
+DEFINE_PERAG_REF_EVENT(xfs_perag_clear_cowblocks);

DECLARE_EVENT_CLASS(xfs_ag_class,
TP_PROTO(struct xfs_mount *mp, xfs_agnumber_t agno),
@@ -687,6 +689,9 @@ DEFINE_INODE_EVENT(xfs_dquot_dqdetach);
DEFINE_INODE_EVENT(xfs_inode_set_eofblocks_tag);
DEFINE_INODE_EVENT(xfs_inode_clear_eofblocks_tag);
DEFINE_INODE_EVENT(xfs_inode_free_eofblocks_invalid);
+DEFINE_INODE_EVENT(xfs_inode_set_cowblocks_tag);
+DEFINE_INODE_EVENT(xfs_inode_clear_cowblocks_tag);
+DEFINE_INODE_EVENT(xfs_inode_free_cowblocks_invalid);

DEFINE_INODE_EVENT(xfs_filemap_fault);
DEFINE_INODE_EVENT(xfs_filemap_pmd_fault);