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xfs: embedd mru_elem into parent structure 

There is no need to do a separate allocation for each mru element, just
embedd the structure into the parent one in the user.  Besides saving
a memory allocation and the infrastructure required for it this also
simplifies the API.

While we do major surgery on xfs_mru_cache.c also de-typedef it and
make struct mru_cache private to the implementation file.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Dave Chinner <david@fromorbit.com>
This commit is contained in:
Christoph Hellwig 2014-04-23 07:11:51 +10:00 committed by Dave Chinner
parent ce695c6551
commit 22328d712d
3 changed files with 107 additions and 146 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

67
fs/xfs/xfs_filestream.c
View File

@ -118,6 +118,7 @@ static kmem_zone_t *item_zone;
*/
typedef struct fstrm_item
{
struct xfs_mru_cache_elem mru;
xfs_agnumber_t ag; /* AG currently in use for the file/directory. */
xfs_inode_t *ip; /* inode self-pointer. */
xfs_inode_t *pip; /* Parent directory inode pointer. */
@ -335,10 +336,10 @@ _xfs_filestream_update_ag(
{
int err = 0;
xfs_mount_t *mp;
xfs_mru_cache_t *cache;
fstrm_item_t *item;
xfs_agnumber_t old_ag;
xfs_inode_t *old_pip;
struct xfs_mru_cache_elem *mru;
/*
* Either ip is a regular file and pip is a directory, or ip is a
@ -349,16 +350,17 @@ _xfs_filestream_update_ag(
(S_ISDIR(ip->i_d.di_mode) && !pip)));
mp = ip->i_mount;
cache = mp->m_filestream;
item = xfs_mru_cache_lookup(cache, ip->i_ino);
if (item) {
mru = xfs_mru_cache_lookup(mp->m_filestream, ip->i_ino);
if (mru) {
item = container_of(mru, fstrm_item_t, mru);
ASSERT(item->ip == ip);
old_ag = item->ag;
item->ag = ag;
old_pip = item->pip;
item->pip = pip;
xfs_mru_cache_done(cache);
xfs_mru_cache_done(mp->m_filestream);
/*
* If the AG has changed, drop the old ref and take a new one,
@ -391,7 +393,7 @@ _xfs_filestream_update_ag(
item->ip = ip;
item->pip = pip;
err = xfs_mru_cache_insert(cache, ip->i_ino, item);
err = xfs_mru_cache_insert(mp->m_filestream, ip->i_ino, &item->mru);
if (err) {
kmem_zone_free(item_zone, item);
return err;
@ -422,14 +424,12 @@ _xfs_filestream_update_ag(
/* xfs_fstrm_free_func(): callback for freeing cached stream items. */
STATIC void
xfs_fstrm_free_func(
unsigned long ino,
void *data)
struct xfs_mru_cache_elem *mru)
{
fstrm_item_t *item = (fstrm_item_t *)data;
fstrm_item_t *item =
container_of(mru, fstrm_item_t, mru);
xfs_inode_t *ip = item->ip;
ASSERT(ip->i_ino == ino);
xfs_iflags_clear(ip, XFS_IFILESTREAM);
/* Drop the reference taken on the AG when the item was added. */
@ -532,7 +532,8 @@ xfs_agnumber_t
xfs_filestream_lookup_ag(
xfs_inode_t *ip)
{
xfs_mru_cache_t *cache;
struct xfs_mount *mp = ip->i_mount;
struct xfs_mru_cache_elem *mru;
fstrm_item_t *item;
xfs_agnumber_t ag;
int ref;
@ -542,17 +543,17 @@ xfs_filestream_lookup_ag(
return NULLAGNUMBER;
}
cache = ip->i_mount->m_filestream;
item = xfs_mru_cache_lookup(cache, ip->i_ino);
if (!item) {
mru = xfs_mru_cache_lookup(mp->m_filestream, ip->i_ino);
if (!mru) {
TRACE_LOOKUP(ip->i_mount, ip, NULL, NULLAGNUMBER, 0);
return NULLAGNUMBER;
}
item = container_of(mru, fstrm_item_t, mru);
ASSERT(ip == item->ip);
ag = item->ag;
ref = xfs_filestream_peek_ag(ip->i_mount, ag);
xfs_mru_cache_done(cache);
xfs_mru_cache_done(mp->m_filestream);
TRACE_LOOKUP(ip->i_mount, ip, item->pip, ag, ref);
return ag;
@ -573,8 +574,8 @@ xfs_filestream_associate(
xfs_inode_t *pip,
xfs_inode_t *ip)
{
struct xfs_mru_cache_elem *mru;
xfs_mount_t *mp;
xfs_mru_cache_t *cache;
fstrm_item_t *item;
xfs_agnumber_t ag, rotorstep, startag;
int err = 0;
@ -585,7 +586,6 @@ xfs_filestream_associate(
return -EINVAL;
mp = pip->i_mount;
cache = mp->m_filestream;
/*
* We have a problem, Houston.
@ -606,11 +606,13 @@ xfs_filestream_associate(
return 1;
/* If the parent directory is already in the cache, use its AG. */
item = xfs_mru_cache_lookup(cache, pip->i_ino);
if (item) {
mru = xfs_mru_cache_lookup(mp->m_filestream, pip->i_ino);
if (mru) {
item = container_of(mru, fstrm_item_t, mru);
ASSERT(item->ip == pip);
ag = item->ag;
xfs_mru_cache_done(cache);
xfs_mru_cache_done(mp->m_filestream);
TRACE_LOOKUP(mp, pip, pip, ag, xfs_filestream_peek_ag(mp, ag));
err = _xfs_filestream_update_ag(ip, pip, ag);
@ -671,17 +673,16 @@ xfs_filestream_new_ag(
struct xfs_bmalloca *ap,
xfs_agnumber_t *agp)
{
struct xfs_mru_cache_elem *mru, *mru2;
int flags, err;
xfs_inode_t *ip, *pip = NULL;
xfs_mount_t *mp;
xfs_mru_cache_t *cache;
xfs_extlen_t minlen;
fstrm_item_t *dir, *file;
xfs_agnumber_t ag = NULLAGNUMBER;
ip = ap->ip;
mp = ip->i_mount;
cache = mp->m_filestream;
minlen = ap->length;
*agp = NULLAGNUMBER;
@ -689,8 +690,9 @@ xfs_filestream_new_ag(
* Look for the file in the cache, removing it if it's found. Doing
* this allows it to be held across the dir lookup that follows.
*/
file = xfs_mru_cache_remove(cache, ip->i_ino);
if (file) {
mru = xfs_mru_cache_remove(mp->m_filestream, ip->i_ino);
if (mru) {
file = container_of(mru, fstrm_item_t, mru);
ASSERT(ip == file->ip);
/* Save the file's parent inode and old AG number for later. */
@ -698,8 +700,9 @@ xfs_filestream_new_ag(
ag = file->ag;
/* Look for the file's directory in the cache. */
dir = xfs_mru_cache_lookup(cache, pip->i_ino);
if (dir) {
mru2 = xfs_mru_cache_lookup(mp->m_filestream, pip->i_ino);
if (mru2) {
dir = container_of(mru2, fstrm_item_t, mru);
ASSERT(pip == dir->ip);
/*
@ -714,7 +717,7 @@ xfs_filestream_new_ag(
*agp = file->ag = dir->ag;
}
xfs_mru_cache_done(cache);
xfs_mru_cache_done(mp->m_filestream);
}
/*
@ -722,9 +725,9 @@ xfs_filestream_new_ag(
* function needs to be called to tidy up in the same way as if
* the item had simply expired from the cache.
*/
err = xfs_mru_cache_insert(cache, ip->i_ino, file);
err = xfs_mru_cache_insert(mp->m_filestream, ip->i_ino, mru);
if (err) {
xfs_fstrm_free_func(ip->i_ino, file);
xfs_fstrm_free_func(mru);
return err;
}
@ -818,7 +821,5 @@ void
xfs_filestream_deassociate(
xfs_inode_t *ip)
{
xfs_mru_cache_t *cache = ip->i_mount->m_filestream;
xfs_mru_cache_delete(cache, ip->i_ino);
xfs_mru_cache_delete(ip->i_mount->m_filestream, ip->i_ino);
}

155
fs/xfs/xfs_mru_cache.c
View File

@ -100,14 +100,20 @@
* likely result in a loop in one of the lists. That's a sure-fire recipe for
* an infinite loop in the code.
*/
typedef struct xfs_mru_cache_elem
{
struct list_head list_node;
unsigned long key;
void *value;
} xfs_mru_cache_elem_t;
struct xfs_mru_cache {
struct radix_tree_root store; /* Core storage data structure. */
struct list_head *lists; /* Array of lists, one per grp. */
struct list_head reap_list; /* Elements overdue for reaping. */
spinlock_t lock; /* Lock to protect this struct. */
unsigned int grp_count; /* Number of discrete groups. */
unsigned int grp_time; /* Time period spanned by grps. */
unsigned int lru_grp; /* Group containing time zero. */
unsigned long time_zero; /* Time first element was added. */
xfs_mru_cache_free_func_t free_func; /* Function pointer for freeing. */
struct delayed_work work; /* Workqueue data for reaping. */
unsigned int queued; /* work has been queued */
};
static kmem_zone_t *xfs_mru_elem_zone;
static struct workqueue_struct *xfs_mru_reap_wq;
/*
@ -129,12 +135,12 @@ static struct workqueue_struct *xfs_mru_reap_wq;
*/
STATIC unsigned long
_xfs_mru_cache_migrate(
xfs_mru_cache_t *mru,
unsigned long now)
struct xfs_mru_cache *mru,
unsigned long now)
{
unsigned int grp;
unsigned int migrated = 0;
struct list_head *lru_list;
unsigned int grp;
unsigned int migrated = 0;
struct list_head *lru_list;
/* Nothing to do if the data store is empty. */
if (!mru->time_zero)
@ -193,11 +199,11 @@ _xfs_mru_cache_migrate(
*/
STATIC void
_xfs_mru_cache_list_insert(
xfs_mru_cache_t *mru,
xfs_mru_cache_elem_t *elem)
struct xfs_mru_cache *mru,
struct xfs_mru_cache_elem *elem)
{
unsigned int grp = 0;
unsigned long now = jiffies;
unsigned int grp = 0;
unsigned long now = jiffies;
/*
* If the data store is empty, initialise time zero, leave grp set to
@ -231,10 +237,10 @@ _xfs_mru_cache_list_insert(
*/
STATIC void
_xfs_mru_cache_clear_reap_list(
xfs_mru_cache_t *mru) __releases(mru->lock) __acquires(mru->lock)
struct xfs_mru_cache *mru)
__releases(mru->lock) __acquires(mru->lock)
{
xfs_mru_cache_elem_t *elem, *next;
struct xfs_mru_cache_elem *elem, *next;
struct list_head tmp;
INIT_LIST_HEAD(&tmp);
@ -252,15 +258,8 @@ _xfs_mru_cache_clear_reap_list(
spin_unlock(&mru->lock);
list_for_each_entry_safe(elem, next, &tmp, list_node) {
/* Remove the element from the reap list. */
list_del_init(&elem->list_node);
/* Call the client's free function with the key and value pointer. */
mru->free_func(elem->key, elem->value);
/* Free the element structure. */
kmem_zone_free(xfs_mru_elem_zone, elem);
mru->free_func(elem);
}
spin_lock(&mru->lock);
@ -277,7 +276,8 @@ STATIC void
_xfs_mru_cache_reap(
struct work_struct *work)
{
xfs_mru_cache_t *mru = container_of(work, xfs_mru_cache_t, work.work);
struct xfs_mru_cache *mru =
container_of(work, struct xfs_mru_cache, work.work);
unsigned long now, next;
ASSERT(mru && mru->lists);
@ -304,28 +304,16 @@ _xfs_mru_cache_reap(
int
xfs_mru_cache_init(void)
{
xfs_mru_elem_zone = kmem_zone_init(sizeof(xfs_mru_cache_elem_t),
"xfs_mru_cache_elem");
if (!xfs_mru_elem_zone)
goto out;
xfs_mru_reap_wq = alloc_workqueue("xfs_mru_cache", WQ_MEM_RECLAIM, 1);
if (!xfs_mru_reap_wq)
goto out_destroy_mru_elem_zone;
return -ENOMEM;
return 0;
out_destroy_mru_elem_zone:
kmem_zone_destroy(xfs_mru_elem_zone);
out:
return -ENOMEM;
}
void
xfs_mru_cache_uninit(void)
{
destroy_workqueue(xfs_mru_reap_wq);
kmem_zone_destroy(xfs_mru_elem_zone);
}
/*
@ -336,14 +324,14 @@ xfs_mru_cache_uninit(void)
*/
int
xfs_mru_cache_create(
xfs_mru_cache_t **mrup,
struct xfs_mru_cache **mrup,
unsigned int lifetime_ms,
unsigned int grp_count,
xfs_mru_cache_free_func_t free_func)
{
xfs_mru_cache_t *mru = NULL;
int err = 0, grp;
unsigned int grp_time;
struct xfs_mru_cache *mru = NULL;
int err = 0, grp;
unsigned int grp_time;
if (mrup)
*mrup = NULL;
@ -400,7 +388,7 @@ exit:
*/
static void
xfs_mru_cache_flush(
xfs_mru_cache_t *mru)
struct xfs_mru_cache *mru)
{
if (!mru || !mru->lists)
return;
@ -420,7 +408,7 @@ xfs_mru_cache_flush(
void
xfs_mru_cache_destroy(
xfs_mru_cache_t *mru)
struct xfs_mru_cache *mru)
{
if (!mru || !mru->lists)
return;
@ -438,45 +426,29 @@ xfs_mru_cache_destroy(
*/
int
xfs_mru_cache_insert(
xfs_mru_cache_t *mru,
unsigned long key,
void *value)
struct xfs_mru_cache *mru,
unsigned long key,
struct xfs_mru_cache_elem *elem)
{
xfs_mru_cache_elem_t *elem;
int error;
int error;
ASSERT(mru && mru->lists);
if (!mru || !mru->lists)
return EINVAL;
elem = kmem_zone_zalloc(xfs_mru_elem_zone, KM_SLEEP);
if (!elem)
if (radix_tree_preload(GFP_KERNEL))
return ENOMEM;
if (radix_tree_preload(GFP_KERNEL)) {
error = ENOMEM;
goto out_free_item;
}
INIT_LIST_HEAD(&elem->list_node);
elem->key = key;
elem->value = value;
spin_lock(&mru->lock);
error = -radix_tree_insert(&mru->store, key, elem);
radix_tree_preload_end();
if (error) {
spin_unlock(&mru->lock);
goto out_free_item;
}
_xfs_mru_cache_list_insert(mru, elem);
if (!error)
_xfs_mru_cache_list_insert(mru, elem);
spin_unlock(&mru->lock);
return 0;
out_free_item:
kmem_zone_free(xfs_mru_elem_zone, elem);
return error;
}
@ -486,13 +458,12 @@ out_free_item:
* the client data pointer for the removed element is returned, otherwise this
* function will return a NULL pointer.
*/
void *
struct xfs_mru_cache_elem *
xfs_mru_cache_remove(
xfs_mru_cache_t *mru,
unsigned long key)
struct xfs_mru_cache *mru,
unsigned long key)
{
xfs_mru_cache_elem_t *elem;
void *value = NULL;
struct xfs_mru_cache_elem *elem;
ASSERT(mru && mru->lists);
if (!mru || !mru->lists)
@ -500,17 +471,11 @@ xfs_mru_cache_remove(
spin_lock(&mru->lock);
elem = radix_tree_delete(&mru->store, key);
if (elem) {
value = elem->value;
if (elem)
list_del(&elem->list_node);
}
spin_unlock(&mru->lock);
if (elem)
kmem_zone_free(xfs_mru_elem_zone, elem);
return value;
return elem;
}
/*
@ -519,13 +484,14 @@ xfs_mru_cache_remove(
*/
void
xfs_mru_cache_delete(
xfs_mru_cache_t *mru,
unsigned long key)
struct xfs_mru_cache *mru,
unsigned long key)
{
void *value = xfs_mru_cache_remove(mru, key);
struct xfs_mru_cache_elem *elem;
if (value)
mru->free_func(key, value);
elem = xfs_mru_cache_remove(mru, key);
if (elem)
mru->free_func(elem);
}
/*
@ -548,12 +514,12 @@ xfs_mru_cache_delete(
* status, we need to help it get it right by annotating the path that does
* not release the lock.
*/
void *
struct xfs_mru_cache_elem *
xfs_mru_cache_lookup(
xfs_mru_cache_t *mru,
unsigned long key)
struct xfs_mru_cache *mru,
unsigned long key)
{
xfs_mru_cache_elem_t *elem;
struct xfs_mru_cache_elem *elem;
ASSERT(mru && mru->lists);
if (!mru || !mru->lists)
@ -568,7 +534,7 @@ xfs_mru_cache_lookup(
} else
spin_unlock(&mru->lock);
return elem ? elem->value : NULL;
return elem;
}
/*
@ -578,7 +544,8 @@ xfs_mru_cache_lookup(
*/
void
xfs_mru_cache_done(
xfs_mru_cache_t *mru) __releases(mru->lock)
struct xfs_mru_cache *mru)
__releases(mru->lock)
{
spin_unlock(&mru->lock);
}

31
fs/xfs/xfs_mru_cache.h
View File

@ -18,24 +18,15 @@
#ifndef __XFS_MRU_CACHE_H__
#define __XFS_MRU_CACHE_H__
struct xfs_mru_cache;
struct xfs_mru_cache_elem {
struct list_head list_node;
unsigned long key;
};
/* Function pointer type for callback to free a client's data pointer. */
typedef void (*xfs_mru_cache_free_func_t)(unsigned long, void*);
typedef struct xfs_mru_cache
{
struct radix_tree_root store; /* Core storage data structure. */
struct list_head *lists; /* Array of lists, one per grp. */
struct list_head reap_list; /* Elements overdue for reaping. */
spinlock_t lock; /* Lock to protect this struct. */
unsigned int grp_count; /* Number of discrete groups. */
unsigned int grp_time; /* Time period spanned by grps. */
unsigned int lru_grp; /* Group containing time zero. */
unsigned long time_zero; /* Time first element was added. */
xfs_mru_cache_free_func_t free_func; /* Function pointer for freeing. */
struct delayed_work work; /* Workqueue data for reaping. */
unsigned int queued; /* work has been queued */
} xfs_mru_cache_t;
typedef void (*xfs_mru_cache_free_func_t)(struct xfs_mru_cache_elem *elem);
int xfs_mru_cache_init(void);
void xfs_mru_cache_uninit(void);
@ -44,10 +35,12 @@ int xfs_mru_cache_create(struct xfs_mru_cache **mrup, unsigned int lifetime_ms,
xfs_mru_cache_free_func_t free_func);
void xfs_mru_cache_destroy(struct xfs_mru_cache *mru);
int xfs_mru_cache_insert(struct xfs_mru_cache *mru, unsigned long key,
void *value);
void * xfs_mru_cache_remove(struct xfs_mru_cache *mru, unsigned long key);
struct xfs_mru_cache_elem *elem);
struct xfs_mru_cache_elem *
xfs_mru_cache_remove(struct xfs_mru_cache *mru, unsigned long key);
void xfs_mru_cache_delete(struct xfs_mru_cache *mru, unsigned long key);
void *xfs_mru_cache_lookup(struct xfs_mru_cache *mru, unsigned long key);
struct xfs_mru_cache_elem *
xfs_mru_cache_lookup(struct xfs_mru_cache *mru, unsigned long key);
void xfs_mru_cache_done(struct xfs_mru_cache *mru);
#endif /* __XFS_MRU_CACHE_H__ */