Commit e97e7120 authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://oss.sgi.com/xfs/xfs

* 'for-linus' of git://oss.sgi.com/xfs/xfs:
  xfs: add a shrinker to background inode reclaim
parents fed0a9c6 9bf729c0
......@@ -1209,6 +1209,7 @@ xfs_fs_put_super(
xfs_unmountfs(mp);
xfs_freesb(mp);
xfs_inode_shrinker_unregister(mp);
xfs_icsb_destroy_counters(mp);
xfs_close_devices(mp);
xfs_dmops_put(mp);
......@@ -1622,6 +1623,8 @@ xfs_fs_fill_super(
if (error)
goto fail_vnrele;
xfs_inode_shrinker_register(mp);
kfree(mtpt);
return 0;
......@@ -1867,6 +1870,7 @@ init_xfs_fs(void)
goto out_cleanup_procfs;
vfs_initquota();
xfs_inode_shrinker_init();
error = register_filesystem(&xfs_fs_type);
if (error)
......@@ -1894,6 +1898,7 @@ exit_xfs_fs(void)
{
vfs_exitquota();
unregister_filesystem(&xfs_fs_type);
xfs_inode_shrinker_destroy();
xfs_sysctl_unregister();
xfs_cleanup_procfs();
xfs_buf_terminate();
......
......@@ -95,7 +95,8 @@ xfs_inode_ag_walk(
struct xfs_perag *pag, int flags),
int flags,
int tag,
int exclusive)
int exclusive,
int *nr_to_scan)
{
uint32_t first_index;
int last_error = 0;
......@@ -134,7 +135,7 @@ xfs_inode_ag_walk(
if (error == EFSCORRUPTED)
break;
} while (1);
} while ((*nr_to_scan)--);
if (skipped) {
delay(1);
......@@ -150,12 +151,15 @@ xfs_inode_ag_iterator(
struct xfs_perag *pag, int flags),
int flags,
int tag,
int exclusive)
int exclusive,
int *nr_to_scan)
{
int error = 0;
int last_error = 0;
xfs_agnumber_t ag;
int nr;
nr = nr_to_scan ? *nr_to_scan : INT_MAX;
for (ag = 0; ag < mp->m_sb.sb_agcount; ag++) {
struct xfs_perag *pag;
......@@ -165,14 +169,18 @@ xfs_inode_ag_iterator(
continue;
}
error = xfs_inode_ag_walk(mp, pag, execute, flags, tag,
exclusive);
exclusive, &nr);
xfs_perag_put(pag);
if (error) {
last_error = error;
if (error == EFSCORRUPTED)
break;
}
if (nr <= 0)
break;
}
if (nr_to_scan)
*nr_to_scan = nr;
return XFS_ERROR(last_error);
}
......@@ -291,7 +299,7 @@ xfs_sync_data(
ASSERT((flags & ~(SYNC_TRYLOCK|SYNC_WAIT)) == 0);
error = xfs_inode_ag_iterator(mp, xfs_sync_inode_data, flags,
XFS_ICI_NO_TAG, 0);
XFS_ICI_NO_TAG, 0, NULL);
if (error)
return XFS_ERROR(error);
......@@ -310,7 +318,7 @@ xfs_sync_attr(
ASSERT((flags & ~SYNC_WAIT) == 0);
return xfs_inode_ag_iterator(mp, xfs_sync_inode_attr, flags,
XFS_ICI_NO_TAG, 0);
XFS_ICI_NO_TAG, 0, NULL);
}
STATIC int
......@@ -673,6 +681,7 @@ __xfs_inode_set_reclaim_tag(
radix_tree_tag_set(&pag->pag_ici_root,
XFS_INO_TO_AGINO(ip->i_mount, ip->i_ino),
XFS_ICI_RECLAIM_TAG);
pag->pag_ici_reclaimable++;
}
/*
......@@ -705,6 +714,7 @@ __xfs_inode_clear_reclaim_tag(
{
radix_tree_tag_clear(&pag->pag_ici_root,
XFS_INO_TO_AGINO(mp, ip->i_ino), XFS_ICI_RECLAIM_TAG);
pag->pag_ici_reclaimable--;
}
/*
......@@ -854,5 +864,93 @@ xfs_reclaim_inodes(
int mode)
{
return xfs_inode_ag_iterator(mp, xfs_reclaim_inode, mode,
XFS_ICI_RECLAIM_TAG, 1);
XFS_ICI_RECLAIM_TAG, 1, NULL);
}
/*
* Shrinker infrastructure.
*
* This is all far more complex than it needs to be. It adds a global list of
* mounts because the shrinkers can only call a global context. We need to make
* the shrinkers pass a context to avoid the need for global state.
*/
static LIST_HEAD(xfs_mount_list);
static struct rw_semaphore xfs_mount_list_lock;
static int
xfs_reclaim_inode_shrink(
int nr_to_scan,
gfp_t gfp_mask)
{
struct xfs_mount *mp;
struct xfs_perag *pag;
xfs_agnumber_t ag;
int reclaimable = 0;
if (nr_to_scan) {
if (!(gfp_mask & __GFP_FS))
return -1;
down_read(&xfs_mount_list_lock);
list_for_each_entry(mp, &xfs_mount_list, m_mplist) {
xfs_inode_ag_iterator(mp, xfs_reclaim_inode, 0,
XFS_ICI_RECLAIM_TAG, 1, &nr_to_scan);
if (nr_to_scan <= 0)
break;
}
up_read(&xfs_mount_list_lock);
}
down_read(&xfs_mount_list_lock);
list_for_each_entry(mp, &xfs_mount_list, m_mplist) {
for (ag = 0; ag < mp->m_sb.sb_agcount; ag++) {
pag = xfs_perag_get(mp, ag);
if (!pag->pag_ici_init) {
xfs_perag_put(pag);
continue;
}
reclaimable += pag->pag_ici_reclaimable;
xfs_perag_put(pag);
}
}
up_read(&xfs_mount_list_lock);
return reclaimable;
}
static struct shrinker xfs_inode_shrinker = {
.shrink = xfs_reclaim_inode_shrink,
.seeks = DEFAULT_SEEKS,
};
void __init
xfs_inode_shrinker_init(void)
{
init_rwsem(&xfs_mount_list_lock);
register_shrinker(&xfs_inode_shrinker);
}
void
xfs_inode_shrinker_destroy(void)
{
ASSERT(list_empty(&xfs_mount_list));
unregister_shrinker(&xfs_inode_shrinker);
}
void
xfs_inode_shrinker_register(
struct xfs_mount *mp)
{
down_write(&xfs_mount_list_lock);
list_add_tail(&mp->m_mplist, &xfs_mount_list);
up_write(&xfs_mount_list_lock);
}
void
xfs_inode_shrinker_unregister(
struct xfs_mount *mp)
{
down_write(&xfs_mount_list_lock);
list_del(&mp->m_mplist);
up_write(&xfs_mount_list_lock);
}
......@@ -53,6 +53,11 @@ void __xfs_inode_clear_reclaim_tag(struct xfs_mount *mp, struct xfs_perag *pag,
int xfs_sync_inode_valid(struct xfs_inode *ip, struct xfs_perag *pag);
int xfs_inode_ag_iterator(struct xfs_mount *mp,
int (*execute)(struct xfs_inode *ip, struct xfs_perag *pag, int flags),
int flags, int tag, int write_lock);
int flags, int tag, int write_lock, int *nr_to_scan);
void xfs_inode_shrinker_init(void);
void xfs_inode_shrinker_destroy(void);
void xfs_inode_shrinker_register(struct xfs_mount *mp);
void xfs_inode_shrinker_unregister(struct xfs_mount *mp);
#endif
......@@ -891,7 +891,8 @@ xfs_qm_dqrele_all_inodes(
uint flags)
{
ASSERT(mp->m_quotainfo);
xfs_inode_ag_iterator(mp, xfs_dqrele_inode, flags, XFS_ICI_NO_TAG, 0);
xfs_inode_ag_iterator(mp, xfs_dqrele_inode, flags,
XFS_ICI_NO_TAG, 0, NULL);
}
/*------------------------------------------------------------------------*/
......
......@@ -223,6 +223,7 @@ typedef struct xfs_perag {
int pag_ici_init; /* incore inode cache initialised */
rwlock_t pag_ici_lock; /* incore inode lock */
struct radix_tree_root pag_ici_root; /* incore inode cache root */
int pag_ici_reclaimable; /* reclaimable inodes */
#endif
int pagb_count; /* pagb slots in use */
xfs_perag_busy_t pagb_list[XFS_PAGB_NUM_SLOTS]; /* unstable blocks */
......
......@@ -259,6 +259,7 @@ typedef struct xfs_mount {
wait_queue_head_t m_wait_single_sync_task;
__int64_t m_update_flags; /* sb flags we need to update
on the next remount,rw */
struct list_head m_mplist; /* inode shrinker mount list */
} xfs_mount_t;
/*
......
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