UBI: create ltree_entry slab on initialization
Linux-MTD Mailing List
linux-mtd at lists.infradead.org
Tue Jan 8 02:59:02 EST 2008
Gitweb: http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=3a8d4642861fb69b62401949e490c0bcb19ceb40
Commit: 3a8d4642861fb69b62401949e490c0bcb19ceb40
Parent: 01f7b309e453dc8499c318f6810f76b606b66134
Author: Artem Bityutskiy <Artem.Bityutskiy at nokia.com>
AuthorDate: Sun Dec 16 12:32:51 2007 +0200
Committer: Artem Bityutskiy <Artem.Bityutskiy at nokia.com>
CommitDate: Wed Dec 26 19:15:14 2007 +0200
UBI: create ltree_entry slab on initialization
Since the ltree_entry slab cache is a global entity, which is
used by all UBI devices, it is more logical to create it on
module initialization time and destro on module exit time.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy at nokia.com>
---
drivers/mtd/ubi/build.c | 26 ++++++++++++++
drivers/mtd/ubi/eba.c | 85 ++++++++++-------------------------------------
drivers/mtd/ubi/ubi.h | 23 +++++++++++++
3 files changed, 67 insertions(+), 67 deletions(-)
diff --git a/drivers/mtd/ubi/build.c b/drivers/mtd/ubi/build.c
index 5490a73..44c8521 100644
--- a/drivers/mtd/ubi/build.c
+++ b/drivers/mtd/ubi/build.c
@@ -67,6 +67,9 @@ struct ubi_device *ubi_devices[UBI_MAX_DEVICES];
/* Root UBI "class" object (corresponds to '/<sysfs>/class/ubi/') */
struct class *ubi_class;
+/* Slab cache for lock-tree entries */
+struct kmem_cache *ubi_ltree_slab;
+
/* "Show" method for files in '/<sysfs>/class/ubi/' */
static ssize_t ubi_version_show(struct class *class, char *buf)
{
@@ -687,6 +690,20 @@ static void detach_mtd_dev(struct ubi_device *ubi)
ubi_msg("mtd%d is detached from ubi%d", mtd_num, ubi_num);
}
+/**
+ * ltree_entry_ctor - lock tree entries slab cache constructor.
+ * @obj: the lock-tree entry to construct
+ * @cache: the lock tree entry slab cache
+ * @flags: constructor flags
+ */
+static void ltree_entry_ctor(struct kmem_cache *cache, void *obj)
+{
+ struct ubi_ltree_entry *le = obj;
+
+ le->users = 0;
+ init_rwsem(&le->mutex);
+}
+
static int __init ubi_init(void)
{
int err, i, k;
@@ -709,6 +726,12 @@ static int __init ubi_init(void)
if (err)
goto out_class;
+ ubi_ltree_slab = kmem_cache_create("ubi_ltree_slab",
+ sizeof(struct ubi_ltree_entry), 0,
+ 0, <ree_entry_ctor);
+ if (!ubi_ltree_slab)
+ goto out_version;
+
/* Attach MTD devices */
for (i = 0; i < mtd_devs; i++) {
struct mtd_dev_param *p = &mtd_dev_param[i];
@@ -724,6 +747,8 @@ static int __init ubi_init(void)
out_detach:
for (k = 0; k < i; k++)
detach_mtd_dev(ubi_devices[k]);
+ kmem_cache_destroy(ubi_ltree_slab);
+out_version:
class_remove_file(ubi_class, &ubi_version);
out_class:
class_destroy(ubi_class);
@@ -737,6 +762,7 @@ static void __exit ubi_exit(void)
for (i = 0; i < n; i++)
detach_mtd_dev(ubi_devices[i]);
+ kmem_cache_destroy(ubi_ltree_slab);
class_remove_file(ubi_class, &ubi_version);
class_destroy(ubi_class);
}
diff --git a/drivers/mtd/ubi/eba.c b/drivers/mtd/ubi/eba.c
index c87db07..5fdb31b 100644
--- a/drivers/mtd/ubi/eba.c
+++ b/drivers/mtd/ubi/eba.c
@@ -31,7 +31,7 @@
* logical eraseblock it is locked for reading or writing. The per-logical
* eraseblock locking is implemented by means of the lock tree. The lock tree
* is an RB-tree which refers all the currently locked logical eraseblocks. The
- * lock tree elements are &struct ltree_entry objects. They are indexed by
+ * lock tree elements are &struct ubi_ltree_entry objects. They are indexed by
* (@vol_id, @lnum) pairs.
*
* EBA also maintains the global sequence counter which is incremented each
@@ -50,29 +50,6 @@
#define EBA_RESERVED_PEBS 1
/**
- * struct ltree_entry - an entry in the lock tree.
- * @rb: links RB-tree nodes
- * @vol_id: volume ID of the locked logical eraseblock
- * @lnum: locked logical eraseblock number
- * @users: how many tasks are using this logical eraseblock or wait for it
- * @mutex: read/write mutex to implement read/write access serialization to
- * the (@vol_id, @lnum) logical eraseblock
- *
- * When a logical eraseblock is being locked - corresponding &struct ltree_entry
- * object is inserted to the lock tree (@ubi->ltree).
- */
-struct ltree_entry {
- struct rb_node rb;
- int vol_id;
- int lnum;
- int users;
- struct rw_semaphore mutex;
-};
-
-/* Slab cache for lock-tree entries */
-static struct kmem_cache *ltree_slab;
-
-/**
* next_sqnum - get next sequence number.
* @ubi: UBI device description object
*
@@ -112,20 +89,20 @@ static int ubi_get_compat(const struct ubi_device *ubi, int vol_id)
* @vol_id: volume ID
* @lnum: logical eraseblock number
*
- * This function returns a pointer to the corresponding &struct ltree_entry
+ * This function returns a pointer to the corresponding &struct ubi_ltree_entry
* object if the logical eraseblock is locked and %NULL if it is not.
* @ubi->ltree_lock has to be locked.
*/
-static struct ltree_entry *ltree_lookup(struct ubi_device *ubi, int vol_id,
- int lnum)
+static struct ubi_ltree_entry *ltree_lookup(struct ubi_device *ubi, int vol_id,
+ int lnum)
{
struct rb_node *p;
p = ubi->ltree.rb_node;
while (p) {
- struct ltree_entry *le;
+ struct ubi_ltree_entry *le;
- le = rb_entry(p, struct ltree_entry, rb);
+ le = rb_entry(p, struct ubi_ltree_entry, rb);
if (vol_id < le->vol_id)
p = p->rb_left;
@@ -155,12 +132,12 @@ static struct ltree_entry *ltree_lookup(struct ubi_device *ubi, int vol_id,
* Returns pointer to the lock tree entry or %-ENOMEM if memory allocation
* failed.
*/
-static struct ltree_entry *ltree_add_entry(struct ubi_device *ubi, int vol_id,
- int lnum)
+static struct ubi_ltree_entry *ltree_add_entry(struct ubi_device *ubi,
+ int vol_id, int lnum)
{
- struct ltree_entry *le, *le1, *le_free;
+ struct ubi_ltree_entry *le, *le1, *le_free;
- le = kmem_cache_alloc(ltree_slab, GFP_NOFS);
+ le = kmem_cache_alloc(ubi_ltree_slab, GFP_NOFS);
if (!le)
return ERR_PTR(-ENOMEM);
@@ -189,7 +166,7 @@ static struct ltree_entry *ltree_add_entry(struct ubi_device *ubi, int vol_id,
p = &ubi->ltree.rb_node;
while (*p) {
parent = *p;
- le1 = rb_entry(parent, struct ltree_entry, rb);
+ le1 = rb_entry(parent, struct ubi_ltree_entry, rb);
if (vol_id < le1->vol_id)
p = &(*p)->rb_left;
@@ -211,7 +188,7 @@ static struct ltree_entry *ltree_add_entry(struct ubi_device *ubi, int vol_id,
spin_unlock(&ubi->ltree_lock);
if (le_free)
- kmem_cache_free(ltree_slab, le_free);
+ kmem_cache_free(ubi_ltree_slab, le_free);
return le;
}
@@ -227,7 +204,7 @@ static struct ltree_entry *ltree_add_entry(struct ubi_device *ubi, int vol_id,
*/
static int leb_read_lock(struct ubi_device *ubi, int vol_id, int lnum)
{
- struct ltree_entry *le;
+ struct ubi_ltree_entry *le;
le = ltree_add_entry(ubi, vol_id, lnum);
if (IS_ERR(le))
@@ -245,7 +222,7 @@ static int leb_read_lock(struct ubi_device *ubi, int vol_id, int lnum)
static void leb_read_unlock(struct ubi_device *ubi, int vol_id, int lnum)
{
int free = 0;
- struct ltree_entry *le;
+ struct ubi_ltree_entry *le;
spin_lock(&ubi->ltree_lock);
le = ltree_lookup(ubi, vol_id, lnum);
@@ -259,7 +236,7 @@ static void leb_read_unlock(struct ubi_device *ubi, int vol_id, int lnum)
up_read(&le->mutex);
if (free)
- kmem_cache_free(ltree_slab, le);
+ kmem_cache_free(ubi_ltree_slab, le);
}
/**
@@ -273,7 +250,7 @@ static void leb_read_unlock(struct ubi_device *ubi, int vol_id, int lnum)
*/
static int leb_write_lock(struct ubi_device *ubi, int vol_id, int lnum)
{
- struct ltree_entry *le;
+ struct ubi_ltree_entry *le;
le = ltree_add_entry(ubi, vol_id, lnum);
if (IS_ERR(le))
@@ -291,7 +268,7 @@ static int leb_write_lock(struct ubi_device *ubi, int vol_id, int lnum)
static void leb_write_unlock(struct ubi_device *ubi, int vol_id, int lnum)
{
int free;
- struct ltree_entry *le;
+ struct ubi_ltree_entry *le;
spin_lock(&ubi->ltree_lock);
le = ltree_lookup(ubi, vol_id, lnum);
@@ -306,7 +283,7 @@ static void leb_write_unlock(struct ubi_device *ubi, int vol_id, int lnum)
up_write(&le->mutex);
if (free)
- kmem_cache_free(ltree_slab, le);
+ kmem_cache_free(ubi_ltree_slab, le);
}
/**
@@ -931,20 +908,6 @@ write_error:
}
/**
- * ltree_entry_ctor - lock tree entries slab cache constructor.
- * @obj: the lock-tree entry to construct
- * @cache: the lock tree entry slab cache
- * @flags: constructor flags
- */
-static void ltree_entry_ctor(struct kmem_cache *cache, void *obj)
-{
- struct ltree_entry *le = obj;
-
- le->users = 0;
- init_rwsem(&le->mutex);
-}
-
-/**
* ubi_eba_copy_leb - copy logical eraseblock.
* @ubi: UBI device description object
* @from: physical eraseblock number from where to copy
@@ -1128,14 +1091,6 @@ int ubi_eba_init_scan(struct ubi_device *ubi, struct ubi_scan_info *si)
mutex_init(&ubi->alc_mutex);
ubi->ltree = RB_ROOT;
- if (ubi_devices_cnt == 0) {
- ltree_slab = kmem_cache_create("ubi_ltree_slab",
- sizeof(struct ltree_entry), 0,
- 0, <ree_entry_ctor);
- if (!ltree_slab)
- return -ENOMEM;
- }
-
ubi->global_sqnum = si->max_sqnum + 1;
num_volumes = ubi->vtbl_slots + UBI_INT_VOL_COUNT;
@@ -1205,8 +1160,6 @@ out_free:
continue;
kfree(ubi->volumes[i]->eba_tbl);
}
- if (ubi_devices_cnt == 0)
- kmem_cache_destroy(ltree_slab);
return err;
}
@@ -1225,6 +1178,4 @@ void ubi_eba_close(const struct ubi_device *ubi)
continue;
kfree(ubi->volumes[i]->eba_tbl);
}
- if (ubi_devices_cnt == 1)
- kmem_cache_destroy(ltree_slab);
}
diff --git a/drivers/mtd/ubi/ubi.h b/drivers/mtd/ubi/ubi.h
index 318ce25..0f2ea81 100644
--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
@@ -97,6 +97,28 @@ enum {
extern int ubi_devices_cnt;
extern struct ubi_device *ubi_devices[];
+/**
+ * struct ubi_ltree_entry - an entry in the lock tree.
+ * @rb: links RB-tree nodes
+ * @vol_id: volume ID of the locked logical eraseblock
+ * @lnum: locked logical eraseblock number
+ * @users: how many tasks are using this logical eraseblock or wait for it
+ * @mutex: read/write mutex to implement read/write access serialization to
+ * the (@vol_id, @lnum) logical eraseblock
+ *
+ * This data structure is used in the EBA unit to implement per-LEB locking.
+ * When a logical eraseblock is being locked - corresponding
+ * &struct ubi_ltree_entry object is inserted to the lock tree (@ubi->ltree).
+ * See EBA unit for details.
+ */
+struct ubi_ltree_entry {
+ struct rb_node rb;
+ int vol_id;
+ int lnum;
+ int users;
+ struct rw_semaphore mutex;
+};
+
struct ubi_volume_desc;
/**
@@ -359,6 +381,7 @@ struct ubi_device {
#endif
};
+extern struct kmem_cache *ubi_ltree_slab;
extern struct file_operations ubi_cdev_operations;
extern struct file_operations ubi_vol_cdev_operations;
extern struct class *ubi_class;
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