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dm bufio: introduce forget_buffer_locked 

Introduce a function forget_buffer_locked that forgets a range of
buffers. It is more efficient than calling forget_buffer in a loop.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Mikulas Patocka 2020-06-02 15:34:40 +02:00 committed by Mike Snitzer
parent 88f878e588
commit 33a180623b
2 changed files with 63 additions and 4 deletions
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60
drivers/md/dm-bufio.c
View File

@ -262,6 +262,29 @@ static struct dm_buffer *__find(struct dm_bufio_client *c, sector_t block)
return NULL;
}
static struct dm_buffer *__find_next(struct dm_bufio_client *c, sector_t block)
{
struct rb_node *n = c->buffer_tree.rb_node;
struct dm_buffer *b;
struct dm_buffer *best = NULL;
while (n) {
b = container_of(n, struct dm_buffer, node);
if (b->block == block)
return b;
if (block <= b->block) {
n = n->rb_left;
best = b;
} else {
n = n->rb_right;
}
}
return best;
}
static void __insert(struct dm_bufio_client *c, struct dm_buffer *b)
{
struct rb_node **new = &c->buffer_tree.rb_node, *parent = NULL;
@ -1434,6 +1457,14 @@ retry:
}
EXPORT_SYMBOL_GPL(dm_bufio_release_move);
static void forget_buffer_locked(struct dm_buffer *b)
{
if (likely(!b->hold_count) && likely(!b->state)) {
__unlink_buffer(b);
__free_buffer_wake(b);
}
}
/*
* Free the given buffer.
*
@ -1447,15 +1478,36 @@ void dm_bufio_forget(struct dm_bufio_client *c, sector_t block)
dm_bufio_lock(c);
b = __find(c, block);
if (b && likely(!b->hold_count) && likely(!b->state)) {
__unlink_buffer(b);
__free_buffer_wake(b);
}
if (b)
forget_buffer_locked(b);
dm_bufio_unlock(c);
}
EXPORT_SYMBOL_GPL(dm_bufio_forget);
void dm_bufio_forget_buffers(struct dm_bufio_client *c, sector_t block, sector_t n_blocks)
{
struct dm_buffer *b;
sector_t end_block = block + n_blocks;
while (block < end_block) {
dm_bufio_lock(c);
b = __find_next(c, block);
if (b) {
block = b->block + 1;
forget_buffer_locked(b);
}
dm_bufio_unlock(c);
if (!b)
break;
}
}
EXPORT_SYMBOL_GPL(dm_bufio_forget_buffers);
void dm_bufio_set_minimum_buffers(struct dm_bufio_client *c, unsigned n)
{
c->minimum_buffers = n;

7
include/linux/dm-bufio.h
View File

@ -136,6 +136,13 @@ void dm_bufio_release_move(struct dm_buffer *b, sector_t new_block);
*/
void dm_bufio_forget(struct dm_bufio_client *c, sector_t block);
/*
* Free the given range of buffers.
* This is just a hint, if the buffer is in use or dirty, this function
* does nothing.
*/
void dm_bufio_forget_buffers(struct dm_bufio_client *c, sector_t block, sector_t n_blocks);
/*
* Set the minimum number of buffers before cleanup happens.
*/