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path: root/drivers/md/dm-bufio.c
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Diffstat (limited to 'drivers/md/dm-bufio.c')
-rw-r--r--drivers/md/dm-bufio.c130
1 files changed, 75 insertions, 55 deletions
diff --git a/drivers/md/dm-bufio.c b/drivers/md/dm-bufio.c
index bb786c39545e..cf077f9b30c3 100644
--- a/drivers/md/dm-bufio.c
+++ b/drivers/md/dm-bufio.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2009-2011 Red Hat, Inc.
*
@@ -89,18 +90,18 @@ struct dm_bufio_client {
unsigned long n_buffers[LIST_SIZE];
struct block_device *bdev;
- unsigned block_size;
+ unsigned int block_size;
s8 sectors_per_block_bits;
- void (*alloc_callback)(struct dm_buffer *);
- void (*write_callback)(struct dm_buffer *);
+ void (*alloc_callback)(struct dm_buffer *buf);
+ void (*write_callback)(struct dm_buffer *buf);
struct kmem_cache *slab_buffer;
struct kmem_cache *slab_cache;
struct dm_io_client *dm_io;
struct list_head reserved_buffers;
- unsigned need_reserved_buffers;
+ unsigned int need_reserved_buffers;
- unsigned minimum_buffers;
+ unsigned int minimum_buffers;
struct rb_root buffer_tree;
wait_queue_head_t free_buffer_wait;
@@ -145,17 +146,17 @@ struct dm_buffer {
unsigned char list_mode; /* LIST_* */
blk_status_t read_error;
blk_status_t write_error;
- unsigned accessed;
- unsigned hold_count;
+ unsigned int accessed;
+ unsigned int hold_count;
unsigned long state;
unsigned long last_accessed;
- unsigned dirty_start;
- unsigned dirty_end;
- unsigned write_start;
- unsigned write_end;
+ unsigned int dirty_start;
+ unsigned int dirty_end;
+ unsigned int write_start;
+ unsigned int write_end;
struct dm_bufio_client *c;
struct list_head write_list;
- void (*end_io)(struct dm_buffer *, blk_status_t);
+ void (*end_io)(struct dm_buffer *buf, blk_status_t stat);
#ifdef CONFIG_DM_DEBUG_BLOCK_STACK_TRACING
#define MAX_STACK 10
unsigned int stack_len;
@@ -215,12 +216,12 @@ static DEFINE_SPINLOCK(global_spinlock);
static LIST_HEAD(global_queue);
-static unsigned long global_num = 0;
+static unsigned long global_num;
/*
* Buffers are freed after this timeout
*/
-static unsigned dm_bufio_max_age = DM_BUFIO_DEFAULT_AGE_SECS;
+static unsigned int dm_bufio_max_age = DM_BUFIO_DEFAULT_AGE_SECS;
static unsigned long dm_bufio_retain_bytes = DM_BUFIO_DEFAULT_RETAIN_BYTES;
static unsigned long dm_bufio_peak_allocated;
@@ -258,9 +259,11 @@ static void buffer_record_stack(struct dm_buffer *b)
}
#endif
-/*----------------------------------------------------------------
+/*
+ *----------------------------------------------------------------
* A red/black tree acts as an index for all the buffers.
- *--------------------------------------------------------------*/
+ *----------------------------------------------------------------
+ */
static struct dm_buffer *__find(struct dm_bufio_client *c, sector_t block)
{
struct rb_node *n = c->buffer_tree.rb_node;
@@ -438,7 +441,7 @@ static void *alloc_buffer_data(struct dm_bufio_client *c, gfp_t gfp_mask,
* as if GFP_NOIO was specified.
*/
if (gfp_mask & __GFP_NORETRY) {
- unsigned noio_flag = memalloc_noio_save();
+ unsigned int noio_flag = memalloc_noio_save();
void *ptr = __vmalloc(c->block_size, gfp_mask);
memalloc_noio_restore(noio_flag);
@@ -561,7 +564,8 @@ static void __relink_lru(struct dm_buffer *b, int dirty)
b->last_accessed = jiffies;
}
-/*----------------------------------------------------------------
+/*
+ *--------------------------------------------------------------------------
* Submit I/O on the buffer.
*
* Bio interface is faster but it has some problems:
@@ -577,7 +581,8 @@ static void __relink_lru(struct dm_buffer *b, int dirty)
* rejects the bio because it is too large, use dm-io layer to do the I/O.
* The dm-io layer splits the I/O into multiple requests, avoiding the above
* shortcomings.
- *--------------------------------------------------------------*/
+ *--------------------------------------------------------------------------
+ */
/*
* dm-io completion routine. It just calls b->bio.bi_end_io, pretending
@@ -591,7 +596,7 @@ static void dmio_complete(unsigned long error, void *context)
}
static void use_dmio(struct dm_buffer *b, enum req_op op, sector_t sector,
- unsigned n_sectors, unsigned offset)
+ unsigned int n_sectors, unsigned int offset)
{
int r;
struct dm_io_request io_req = {
@@ -623,17 +628,18 @@ static void bio_complete(struct bio *bio)
{
struct dm_buffer *b = bio->bi_private;
blk_status_t status = bio->bi_status;
+
bio_uninit(bio);
kfree(bio);
b->end_io(b, status);
}
static void use_bio(struct dm_buffer *b, enum req_op op, sector_t sector,
- unsigned n_sectors, unsigned offset)
+ unsigned int n_sectors, unsigned int offset)
{
struct bio *bio;
char *ptr;
- unsigned vec_size, len;
+ unsigned int vec_size, len;
vec_size = b->c->block_size >> PAGE_SHIFT;
if (unlikely(b->c->sectors_per_block_bits < PAGE_SHIFT - SECTOR_SHIFT))
@@ -654,7 +660,8 @@ dmio:
len = n_sectors << SECTOR_SHIFT;
do {
- unsigned this_step = min((unsigned)(PAGE_SIZE - offset_in_page(ptr)), len);
+ unsigned int this_step = min((unsigned int)(PAGE_SIZE - offset_in_page(ptr)), len);
+
if (!bio_add_page(bio, virt_to_page(ptr), this_step,
offset_in_page(ptr))) {
bio_put(bio);
@@ -684,9 +691,9 @@ static inline sector_t block_to_sector(struct dm_bufio_client *c, sector_t block
static void submit_io(struct dm_buffer *b, enum req_op op,
void (*end_io)(struct dm_buffer *, blk_status_t))
{
- unsigned n_sectors;
+ unsigned int n_sectors;
sector_t sector;
- unsigned offset, end;
+ unsigned int offset, end;
b->end_io = end_io;
@@ -716,9 +723,11 @@ static void submit_io(struct dm_buffer *b, enum req_op op,
use_dmio(b, op, sector, n_sectors, offset);
}
-/*----------------------------------------------------------------
+/*
+ *--------------------------------------------------------------
* Writing dirty buffers
- *--------------------------------------------------------------*/
+ *--------------------------------------------------------------
+ */
/*
* The endio routine for write.
@@ -775,6 +784,7 @@ static void __write_dirty_buffer(struct dm_buffer *b,
static void __flush_write_list(struct list_head *write_list)
{
struct blk_plug plug;
+
blk_start_plug(&plug);
while (!list_empty(write_list)) {
struct dm_buffer *b =
@@ -998,9 +1008,11 @@ static void __check_watermark(struct dm_bufio_client *c,
__write_dirty_buffers_async(c, 1, write_list);
}
-/*----------------------------------------------------------------
+/*
+ *--------------------------------------------------------------
* Getting a buffer
- *--------------------------------------------------------------*/
+ *--------------------------------------------------------------
+ */
static struct dm_buffer *__bufio_new(struct dm_bufio_client *c, sector_t block,
enum new_flag nf, int *need_submit,
@@ -1156,7 +1168,7 @@ void *dm_bufio_new(struct dm_bufio_client *c, sector_t block,
EXPORT_SYMBOL_GPL(dm_bufio_new);
void dm_bufio_prefetch(struct dm_bufio_client *c,
- sector_t block, unsigned n_blocks)
+ sector_t block, unsigned int n_blocks)
{
struct blk_plug plug;
@@ -1170,6 +1182,7 @@ void dm_bufio_prefetch(struct dm_bufio_client *c,
for (; n_blocks--; block++) {
int need_submit;
struct dm_buffer *b;
+
b = __bufio_new(c, block, NF_PREFETCH, &need_submit,
&write_list);
if (unlikely(!list_empty(&write_list))) {
@@ -1232,7 +1245,7 @@ void dm_bufio_release(struct dm_buffer *b)
EXPORT_SYMBOL_GPL(dm_bufio_release);
void dm_bufio_mark_partial_buffer_dirty(struct dm_buffer *b,
- unsigned start, unsigned end)
+ unsigned int start, unsigned int end)
{
struct dm_bufio_client *c = b->c;
@@ -1454,6 +1467,7 @@ retry:
__link_buffer(b, new_block, LIST_DIRTY);
} else {
sector_t old_block;
+
wait_on_bit_lock_io(&b->state, B_WRITING,
TASK_UNINTERRUPTIBLE);
/*
@@ -1529,13 +1543,13 @@ void dm_bufio_forget_buffers(struct dm_bufio_client *c, sector_t block, sector_t
}
EXPORT_SYMBOL_GPL(dm_bufio_forget_buffers);
-void dm_bufio_set_minimum_buffers(struct dm_bufio_client *c, unsigned n)
+void dm_bufio_set_minimum_buffers(struct dm_bufio_client *c, unsigned int n)
{
c->minimum_buffers = n;
}
EXPORT_SYMBOL_GPL(dm_bufio_set_minimum_buffers);
-unsigned dm_bufio_get_block_size(struct dm_bufio_client *c)
+unsigned int dm_bufio_get_block_size(struct dm_bufio_client *c)
{
return c->block_size;
}
@@ -1544,6 +1558,7 @@ EXPORT_SYMBOL_GPL(dm_bufio_get_block_size);
sector_t dm_bufio_get_device_size(struct dm_bufio_client *c)
{
sector_t s = bdev_nr_sectors(c->bdev);
+
if (s >= c->start)
s -= c->start;
else
@@ -1659,10 +1674,12 @@ static bool __try_evict_buffer(struct dm_buffer *b, gfp_t gfp)
static unsigned long get_retain_buffers(struct dm_bufio_client *c)
{
unsigned long retain_bytes = READ_ONCE(dm_bufio_retain_bytes);
+
if (likely(c->sectors_per_block_bits >= 0))
retain_bytes >>= c->sectors_per_block_bits + SECTOR_SHIFT;
else
retain_bytes /= c->block_size;
+
return retain_bytes;
}
@@ -1734,15 +1751,15 @@ static unsigned long dm_bufio_shrink_count(struct shrinker *shrink, struct shrin
/*
* Create the buffering interface
*/
-struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsigned block_size,
- unsigned reserved_buffers, unsigned aux_size,
+struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsigned int block_size,
+ unsigned int reserved_buffers, unsigned int aux_size,
void (*alloc_callback)(struct dm_buffer *),
void (*write_callback)(struct dm_buffer *),
unsigned int flags)
{
int r;
struct dm_bufio_client *c;
- unsigned i;
+ unsigned int i;
char slab_name[27];
if (!block_size || block_size & ((1 << SECTOR_SHIFT) - 1)) {
@@ -1796,8 +1813,9 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign
if (block_size <= KMALLOC_MAX_SIZE &&
(block_size < PAGE_SIZE || !is_power_of_2(block_size))) {
- unsigned align = min(1U << __ffs(block_size), (unsigned)PAGE_SIZE);
- snprintf(slab_name, sizeof slab_name, "dm_bufio_cache-%u", block_size);
+ unsigned int align = min(1U << __ffs(block_size), (unsigned int)PAGE_SIZE);
+
+ snprintf(slab_name, sizeof(slab_name), "dm_bufio_cache-%u", block_size);
c->slab_cache = kmem_cache_create(slab_name, block_size, align,
SLAB_RECLAIM_ACCOUNT, NULL);
if (!c->slab_cache) {
@@ -1806,9 +1824,9 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign
}
}
if (aux_size)
- snprintf(slab_name, sizeof slab_name, "dm_bufio_buffer-%u", aux_size);
+ snprintf(slab_name, sizeof(slab_name), "dm_bufio_buffer-%u", aux_size);
else
- snprintf(slab_name, sizeof slab_name, "dm_bufio_buffer");
+ snprintf(slab_name, sizeof(slab_name), "dm_bufio_buffer");
c->slab_buffer = kmem_cache_create(slab_name, sizeof(struct dm_buffer) + aux_size,
0, SLAB_RECLAIM_ACCOUNT, NULL);
if (!c->slab_buffer) {
@@ -1833,7 +1851,7 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign
c->shrinker.scan_objects = dm_bufio_shrink_scan;
c->shrinker.seeks = 1;
c->shrinker.batch = 0;
- r = register_shrinker(&c->shrinker, "md-%s:(%u:%u)", slab_name,
+ r = register_shrinker(&c->shrinker, "dm-bufio:(%u:%u)",
MAJOR(bdev->bd_dev), MINOR(bdev->bd_dev));
if (r)
goto bad;
@@ -1872,7 +1890,7 @@ EXPORT_SYMBOL_GPL(dm_bufio_client_create);
*/
void dm_bufio_client_destroy(struct dm_bufio_client *c)
{
- unsigned i;
+ unsigned int i;
drop_buffers(c);
@@ -1920,9 +1938,9 @@ void dm_bufio_set_sector_offset(struct dm_bufio_client *c, sector_t start)
}
EXPORT_SYMBOL_GPL(dm_bufio_set_sector_offset);
-static unsigned get_max_age_hz(void)
+static unsigned int get_max_age_hz(void)
{
- unsigned max_age = READ_ONCE(dm_bufio_max_age);
+ unsigned int max_age = READ_ONCE(dm_bufio_max_age);
if (max_age > UINT_MAX / HZ)
max_age = UINT_MAX / HZ;
@@ -1973,7 +1991,7 @@ static void do_global_cleanup(struct work_struct *w)
struct dm_bufio_client *locked_client = NULL;
struct dm_bufio_client *current_client;
struct dm_buffer *b;
- unsigned spinlock_hold_count;
+ unsigned int spinlock_hold_count;
unsigned long threshold = dm_bufio_cache_size -
dm_bufio_cache_size / DM_BUFIO_LOW_WATERMARK_RATIO;
unsigned long loops = global_num * 2;
@@ -2059,9 +2077,11 @@ static void work_fn(struct work_struct *w)
DM_BUFIO_WORK_TIMER_SECS * HZ);
}
-/*----------------------------------------------------------------
+/*
+ *--------------------------------------------------------------
* Module setup
- *--------------------------------------------------------------*/
+ *--------------------------------------------------------------
+ */
/*
* This is called only once for the whole dm_bufio module.
@@ -2145,28 +2165,28 @@ static void __exit dm_bufio_exit(void)
module_init(dm_bufio_init)
module_exit(dm_bufio_exit)
-module_param_named(max_cache_size_bytes, dm_bufio_cache_size, ulong, S_IRUGO | S_IWUSR);
+module_param_named(max_cache_size_bytes, dm_bufio_cache_size, ulong, 0644);
MODULE_PARM_DESC(max_cache_size_bytes, "Size of metadata cache");
-module_param_named(max_age_seconds, dm_bufio_max_age, uint, S_IRUGO | S_IWUSR);
+module_param_named(max_age_seconds, dm_bufio_max_age, uint, 0644);
MODULE_PARM_DESC(max_age_seconds, "Max age of a buffer in seconds");
-module_param_named(retain_bytes, dm_bufio_retain_bytes, ulong, S_IRUGO | S_IWUSR);
+module_param_named(retain_bytes, dm_bufio_retain_bytes, ulong, 0644);
MODULE_PARM_DESC(retain_bytes, "Try to keep at least this many bytes cached in memory");
-module_param_named(peak_allocated_bytes, dm_bufio_peak_allocated, ulong, S_IRUGO | S_IWUSR);
+module_param_named(peak_allocated_bytes, dm_bufio_peak_allocated, ulong, 0644);
MODULE_PARM_DESC(peak_allocated_bytes, "Tracks the maximum allocated memory");
-module_param_named(allocated_kmem_cache_bytes, dm_bufio_allocated_kmem_cache, ulong, S_IRUGO);
+module_param_named(allocated_kmem_cache_bytes, dm_bufio_allocated_kmem_cache, ulong, 0444);
MODULE_PARM_DESC(allocated_kmem_cache_bytes, "Memory allocated with kmem_cache_alloc");
-module_param_named(allocated_get_free_pages_bytes, dm_bufio_allocated_get_free_pages, ulong, S_IRUGO);
+module_param_named(allocated_get_free_pages_bytes, dm_bufio_allocated_get_free_pages, ulong, 0444);
MODULE_PARM_DESC(allocated_get_free_pages_bytes, "Memory allocated with get_free_pages");
-module_param_named(allocated_vmalloc_bytes, dm_bufio_allocated_vmalloc, ulong, S_IRUGO);
+module_param_named(allocated_vmalloc_bytes, dm_bufio_allocated_vmalloc, ulong, 0444);
MODULE_PARM_DESC(allocated_vmalloc_bytes, "Memory allocated with vmalloc");
-module_param_named(current_allocated_bytes, dm_bufio_current_allocated, ulong, S_IRUGO);
+module_param_named(current_allocated_bytes, dm_bufio_current_allocated, ulong, 0444);
MODULE_PARM_DESC(current_allocated_bytes, "Memory currently used by the cache");
MODULE_AUTHOR("Mikulas Patocka <dm-devel@redhat.com>");
generated by cgit v1.2.3 (git 2.39.0) at 2024-11-25 07:01:24 +0300