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Commit f57de23a authored by Omar Sandoval's avatar Omar Sandoval Committed by Jens Axboe
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blk-mq-debugfs: get rid of a bunch of boilerplate 

A large part of blk-mq-debugfs.c is file_operations and seq_file
boilerplate. This sucks as is but will suck even more when schedulers
can define their own debugfs entries. Factor it all out into a single
blk_mq_debugfs_fops which multiplexes as needed. We store the
request_queue, blk_mq_hw_ctx, or blk_mq_ctx in the parent directory
dentry, which is kind of hacky, but it works.
Signed-off-by: default avatarOmar Sandoval <osandov@fb.com>
Reviewed-by: default avatarHannes Reinecke <hare@suse.com>
Signed-off-by: default avatarJens Axboe <axboe@fb.com>
parent 88aabbd7
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Inline Side-by-side
Showing with 136 additions and 328 deletions
block/blk-mq-debugfs.c
View file @ f57de23a
......@@ -26,23 +26,12 @@
struct blk_mq_debugfs_attr {
const char *name;
umode_t mode;
const struct file_operations *fops;
int (*show)(void *, struct seq_file *);
ssize_t (*write)(void *, const char __user *, size_t, loff_t *);
/* Set either .show or .seq_ops. */
const struct seq_operations *seq_ops;
};
static int blk_mq_debugfs_seq_open(struct inode *inode, struct file *file,
const struct seq_operations *ops)
{
struct seq_file *m;
int ret;
ret = seq_open(file, ops);
if (!ret) {
m = file->private_data;
m->private = inode->i_private;
}
return ret;
}
static int blk_flags_show(struct seq_file *m, const unsigned long flags,
const char *const *flag_name, int flag_name_count)
{
......@@ -97,9 +86,9 @@ static const char *const blk_queue_flag_name[] = {
};
#undef QUEUE_FLAG_NAME
static int blk_queue_flags_show(struct seq_file *m, void *v)
static int queue_state_show(void *data, struct seq_file *m)
{
struct request_queue *q = m->private;
struct request_queue *q = data;
blk_flags_show(m, q->queue_flags, blk_queue_flag_name,
ARRAY_SIZE(blk_queue_flag_name));
......@@ -107,10 +96,10 @@ static int blk_queue_flags_show(struct seq_file *m, void *v)
return 0;
}
static ssize_t blk_queue_flags_store(struct file *file, const char __user *buf,
static ssize_t queue_state_write(void *data, const char __user *buf,
size_t count, loff_t *ppos)
{
struct request_queue *q = file_inode(file)->i_private;
struct request_queue *q = data;
char opbuf[16] = { }, *op;
if (count >= sizeof(opbuf)) {
......@@ -134,19 +123,6 @@ static ssize_t blk_queue_flags_store(struct file *file, const char __user *buf,
return count;
}
static int blk_queue_flags_open(struct inode *inode, struct file *file)
{
return single_open(file, blk_queue_flags_show, inode->i_private);
}
static const struct file_operations blk_queue_flags_fops = {
.open = blk_queue_flags_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
.write = blk_queue_flags_store,
};
static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
{
if (stat->nr_samples) {
......@@ -157,9 +133,9 @@ static void print_stat(struct seq_file *m, struct blk_rq_stat *stat)
}
}
static int queue_poll_stat_show(struct seq_file *m, void *v)
static int queue_poll_stat_show(void *data, struct seq_file *m)
{
struct request_queue *q = m->private;
struct request_queue *q = data;
int bucket;
for (bucket = 0; bucket < BLK_MQ_POLL_STATS_BKTS/2; bucket++) {
......@@ -174,18 +150,6 @@ static int queue_poll_stat_show(struct seq_file *m, void *v)
return 0;
}
static int queue_poll_stat_open(struct inode *inode, struct file *file)
{
return single_open(file, queue_poll_stat_show, inode->i_private);
}
static const struct file_operations queue_poll_stat_fops = {
.open = queue_poll_stat_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
#define HCTX_STATE_NAME(name) [BLK_MQ_S_##name] = #name
static const char *const hctx_state_name[] = {
HCTX_STATE_NAME(STOPPED),
......@@ -196,9 +160,9 @@ static const char *const hctx_state_name[] = {
};
#undef HCTX_STATE_NAME
static int hctx_state_show(struct seq_file *m, void *v)
static int hctx_state_show(void *data, struct seq_file *m)
{
struct blk_mq_hw_ctx *hctx = m->private;
struct blk_mq_hw_ctx *hctx = data;
blk_flags_show(m, hctx->state, hctx_state_name,
ARRAY_SIZE(hctx_state_name));
......@@ -206,18 +170,6 @@ static int hctx_state_show(struct seq_file *m, void *v)
return 0;
}
static int hctx_state_open(struct inode *inode, struct file *file)
{
return single_open(file, hctx_state_show, inode->i_private);
}
static const struct file_operations hctx_state_fops = {
.open = hctx_state_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
#define BLK_TAG_ALLOC_NAME(name) [BLK_TAG_ALLOC_##name] = #name
static const char *const alloc_policy_name[] = {
BLK_TAG_ALLOC_NAME(FIFO),
......@@ -235,9 +187,9 @@ static const char *const hctx_flag_name[] = {
};
#undef HCTX_FLAG_NAME
static int hctx_flags_show(struct seq_file *m, void *v)
static int hctx_flags_show(void *data, struct seq_file *m)
{
struct blk_mq_hw_ctx *hctx = m->private;
struct blk_mq_hw_ctx *hctx = data;
const int alloc_policy = BLK_MQ_FLAG_TO_ALLOC_POLICY(hctx->flags);
seq_puts(m, "alloc_policy=");
......@@ -254,18 +206,6 @@ static int hctx_flags_show(struct seq_file *m, void *v)
return 0;
}
static int hctx_flags_open(struct inode *inode, struct file *file)
{
return single_open(file, hctx_flags_show, inode->i_private);
}
static const struct file_operations hctx_flags_fops = {
.open = hctx_flags_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
#define REQ_OP_NAME(name) [REQ_OP_##name] = #name
static const char *const op_name[] = {
REQ_OP_NAME(READ),
......@@ -383,38 +323,14 @@ static const struct seq_operations hctx_dispatch_seq_ops = {
.show = blk_mq_debugfs_rq_show,
};
static int hctx_dispatch_open(struct inode *inode, struct file *file)
{
return blk_mq_debugfs_seq_open(inode, file, &hctx_dispatch_seq_ops);
}
static const struct file_operations hctx_dispatch_fops = {
.open = hctx_dispatch_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static int hctx_ctx_map_show(struct seq_file *m, void *v)
static int hctx_ctx_map_show(void *data, struct seq_file *m)
{
struct blk_mq_hw_ctx *hctx = m->private;
struct blk_mq_hw_ctx *hctx = data;
sbitmap_bitmap_show(&hctx->ctx_map, m);
return 0;
}
static int hctx_ctx_map_open(struct inode *inode, struct file *file)
{
return single_open(file, hctx_ctx_map_show, inode->i_private);
}
static const struct file_operations hctx_ctx_map_fops = {
.open = hctx_ctx_map_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void blk_mq_debugfs_tags_show(struct seq_file *m,
struct blk_mq_tags *tags)
{
......@@ -432,9 +348,9 @@ static void blk_mq_debugfs_tags_show(struct seq_file *m,
}
}
static int hctx_tags_show(struct seq_file *m, void *v)
static int hctx_tags_show(void *data, struct seq_file *m)
{
struct blk_mq_hw_ctx *hctx = m->private;
struct blk_mq_hw_ctx *hctx = data;
struct request_queue *q = hctx->queue;
int res;
......@@ -449,21 +365,9 @@ static int hctx_tags_show(struct seq_file *m, void *v)
return res;
}
static int hctx_tags_open(struct inode *inode, struct file *file)
static int hctx_tags_bitmap_show(void *data, struct seq_file *m)
{
return single_open(file, hctx_tags_show, inode->i_private);
}
static const struct file_operations hctx_tags_fops = {
.open = hctx_tags_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int hctx_tags_bitmap_show(struct seq_file *m, void *v)
{
struct blk_mq_hw_ctx *hctx = m->private;
struct blk_mq_hw_ctx *hctx = data;
struct request_queue *q = hctx->queue;
int res;
......@@ -478,21 +382,9 @@ static int hctx_tags_bitmap_show(struct seq_file *m, void *v)
return res;
}
static int hctx_tags_bitmap_open(struct inode *inode, struct file *file)
{
return single_open(file, hctx_tags_bitmap_show, inode->i_private);
}
static const struct file_operations hctx_tags_bitmap_fops = {
.open = hctx_tags_bitmap_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int hctx_sched_tags_show(struct seq_file *m, void *v)
static int hctx_sched_tags_show(void *data, struct seq_file *m)
{
struct blk_mq_hw_ctx *hctx = m->private;
struct blk_mq_hw_ctx *hctx = data;
struct request_queue *q = hctx->queue;
int res;
......@@ -507,21 +399,9 @@ static int hctx_sched_tags_show(struct seq_file *m, void *v)
return res;
}
static int hctx_sched_tags_open(struct inode *inode, struct file *file)
static int hctx_sched_tags_bitmap_show(void *data, struct seq_file *m)
{
return single_open(file, hctx_sched_tags_show, inode->i_private);
}
static const struct file_operations hctx_sched_tags_fops = {
.open = hctx_sched_tags_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int hctx_sched_tags_bitmap_show(struct seq_file *m, void *v)
{
struct blk_mq_hw_ctx *hctx = m->private;
struct blk_mq_hw_ctx *hctx = data;
struct request_queue *q = hctx->queue;
int res;
......@@ -536,21 +416,9 @@ static int hctx_sched_tags_bitmap_show(struct seq_file *m, void *v)
return res;
}
static int hctx_sched_tags_bitmap_open(struct inode *inode, struct file *file)
{
return single_open(file, hctx_sched_tags_bitmap_show, inode->i_private);
}
static const struct file_operations hctx_sched_tags_bitmap_fops = {
.open = hctx_sched_tags_bitmap_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static int hctx_io_poll_show(struct seq_file *m, void *v)
static int hctx_io_poll_show(void *data, struct seq_file *m)
{
struct blk_mq_hw_ctx *hctx = m->private;
struct blk_mq_hw_ctx *hctx = data;
seq_printf(m, "considered=%lu\n", hctx->poll_considered);
seq_printf(m, "invoked=%lu\n", hctx->poll_invoked);
......@@ -558,32 +426,18 @@ static int hctx_io_poll_show(struct seq_file *m, void *v)
return 0;
}
static int hctx_io_poll_open(struct inode *inode, struct file *file)
{
return single_open(file, hctx_io_poll_show, inode->i_private);
}
static ssize_t hctx_io_poll_write(struct file *file, const char __user *buf,
static ssize_t hctx_io_poll_write(void *data, const char __user *buf,
size_t count, loff_t *ppos)
{
struct seq_file *m = file->private_data;
struct blk_mq_hw_ctx *hctx = m->private;
struct blk_mq_hw_ctx *hctx = data;
hctx->poll_considered = hctx->poll_invoked = hctx->poll_success = 0;
return count;
}
static const struct file_operations hctx_io_poll_fops = {
.open = hctx_io_poll_open,
.read = seq_read,
.write = hctx_io_poll_write,
.llseek = seq_lseek,
.release = single_release,
};
static int hctx_dispatched_show(struct seq_file *m, void *v)
static int hctx_dispatched_show(void *data, struct seq_file *m)
{
struct blk_mq_hw_ctx *hctx = m->private;
struct blk_mq_hw_ctx *hctx = data;
int i;
seq_printf(m, "%8u\t%lu\n", 0U, hctx->dispatched[0]);
......@@ -598,16 +452,10 @@ static int hctx_dispatched_show(struct seq_file *m, void *v)
return 0;
}
static int hctx_dispatched_open(struct inode *inode, struct file *file)
{
return single_open(file, hctx_dispatched_show, inode->i_private);
}
static ssize_t hctx_dispatched_write(struct file *file, const char __user *buf,
static ssize_t hctx_dispatched_write(void *data, const char __user *buf,
size_t count, loff_t *ppos)
{
struct seq_file *m = file->private_data;
struct blk_mq_hw_ctx *hctx = m->private;
struct blk_mq_hw_ctx *hctx = data;
int i;
for (i = 0; i < BLK_MQ_MAX_DISPATCH_ORDER; i++)
......@@ -615,96 +463,48 @@ static ssize_t hctx_dispatched_write(struct file *file, const char __user *buf,
return count;
}
static const struct file_operations hctx_dispatched_fops = {
.open = hctx_dispatched_open,
.read = seq_read,
.write = hctx_dispatched_write,
.llseek = seq_lseek,
.release = single_release,
};
static int hctx_queued_show(struct seq_file *m, void *v)
static int hctx_queued_show(void *data, struct seq_file *m)
{
struct blk_mq_hw_ctx *hctx = m->private;
struct blk_mq_hw_ctx *hctx = data;
seq_printf(m, "%lu\n", hctx->queued);
return 0;
}
static int hctx_queued_open(struct inode *inode, struct file *file)
{
return single_open(file, hctx_queued_show, inode->i_private);
}
static ssize_t hctx_queued_write(struct file *file, const char __user *buf,
static ssize_t hctx_queued_write(void *data, const char __user *buf,
size_t count, loff_t *ppos)
{
struct seq_file *m = file->private_data;
struct blk_mq_hw_ctx *hctx = m->private;
struct blk_mq_hw_ctx *hctx = data;
hctx->queued = 0;
return count;
}
static const struct file_operations hctx_queued_fops = {
.open = hctx_queued_open,
.read = seq_read,
.write = hctx_queued_write,
.llseek = seq_lseek,
.release = single_release,
};
static int hctx_run_show(struct seq_file *m, void *v)
static int hctx_run_show(void *data, struct seq_file *m)
{
struct blk_mq_hw_ctx *hctx = m->private;
struct blk_mq_hw_ctx *hctx = data;
seq_printf(m, "%lu\n", hctx->run);
return 0;
}
static int hctx_run_open(struct inode *inode, struct file *file)
static ssize_t hctx_run_write(void *data, const char __user *buf, size_t count,
loff_t *ppos)
{
return single_open(file, hctx_run_show, inode->i_private);
}
static ssize_t hctx_run_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct seq_file *m = file->private_data;
struct blk_mq_hw_ctx *hctx = m->private;
struct blk_mq_hw_ctx *hctx = data;
hctx->run = 0;
return count;
}
static const struct file_operations hctx_run_fops = {
.open = hctx_run_open,
.read = seq_read,
.write = hctx_run_write,
.llseek = seq_lseek,
.release = single_release,
};
static int hctx_active_show(struct seq_file *m, void *v)
static int hctx_active_show(void *data, struct seq_file *m)
{
struct blk_mq_hw_ctx *hctx = m->private;
struct blk_mq_hw_ctx *hctx = data;
seq_printf(m, "%d\n", atomic_read(&hctx->nr_active));
return 0;
}
static int hctx_active_open(struct inode *inode, struct file *file)
{
return single_open(file, hctx_active_show, inode->i_private);
}
static const struct file_operations hctx_active_fops = {
.open = hctx_active_open,
.read = seq_read,
.llseek = seq_lseek,
.release = single_release,
};
static void *ctx_rq_list_start(struct seq_file *m, loff_t *pos)
__acquires(&ctx->lock)
{
......@@ -735,140 +535,146 @@ static const struct seq_operations ctx_rq_list_seq_ops = {
.stop = ctx_rq_list_stop,
.show = blk_mq_debugfs_rq_show,
};
static int ctx_rq_list_open(struct inode *inode, struct file *file)
{
return blk_mq_debugfs_seq_open(inode, file, &ctx_rq_list_seq_ops);
}
static const struct file_operations ctx_rq_list_fops = {
.open = ctx_rq_list_open,
.read = seq_read,
.llseek = seq_lseek,
.release = seq_release,
};
static int ctx_dispatched_show(struct seq_file *m, void *v)
static int ctx_dispatched_show(void *data, struct seq_file *m)
{
struct blk_mq_ctx *ctx = m->private;
struct blk_mq_ctx *ctx = data;
seq_printf(m, "%lu %lu\n", ctx->rq_dispatched[1], ctx->rq_dispatched[0]);
return 0;
}
static int ctx_dispatched_open(struct inode *inode, struct file *file)
{
return single_open(file, ctx_dispatched_show, inode->i_private);
}
static ssize_t ctx_dispatched_write(struct file *file, const char __user *buf,
static ssize_t ctx_dispatched_write(void *data, const char __user *buf,
size_t count, loff_t *ppos)
{
struct seq_file *m = file->private_data;
struct blk_mq_ctx *ctx = m->private;
struct blk_mq_ctx *ctx = data;
ctx->rq_dispatched[0] = ctx->rq_dispatched[1] = 0;
return count;
}
static const struct file_operations ctx_dispatched_fops = {
.open = ctx_dispatched_open,
.read = seq_read,
.write = ctx_dispatched_write,
.llseek = seq_lseek,
.release = single_release,
};
static int ctx_merged_show(struct seq_file *m, void *v)
static int ctx_merged_show(void *data, struct seq_file *m)
{
struct blk_mq_ctx *ctx = m->private;
struct blk_mq_ctx *ctx = data;
seq_printf(m, "%lu\n", ctx->rq_merged);
return 0;
}
static int ctx_merged_open(struct inode *inode, struct file *file)
{
return single_open(file, ctx_merged_show, inode->i_private);
}
static ssize_t ctx_merged_write(struct file *file, const char __user *buf,
static ssize_t ctx_merged_write(void *data, const char __user *buf,
size_t count, loff_t *ppos)
{
struct seq_file *m = file->private_data;
struct blk_mq_ctx *ctx = m->private;
struct blk_mq_ctx *ctx = data;
ctx->rq_merged = 0;
return count;
}
static const struct file_operations ctx_merged_fops = {
.open = ctx_merged_open,
.read = seq_read,
.write = ctx_merged_write,
.llseek = seq_lseek,
.release = single_release,
};
static int ctx_completed_show(struct seq_file *m, void *v)
static int ctx_completed_show(void *data, struct seq_file *m)
{
struct blk_mq_ctx *ctx = m->private;
struct blk_mq_ctx *ctx = data;
seq_printf(m, "%lu %lu\n", ctx->rq_completed[1], ctx->rq_completed[0]);
return 0;
}
static int ctx_completed_open(struct inode *inode, struct file *file)
static ssize_t ctx_completed_write(void *data, const char __user *buf,
size_t count, loff_t *ppos)
{
return single_open(file, ctx_completed_show, inode->i_private);
struct blk_mq_ctx *ctx = data;
ctx->rq_completed[0] = ctx->rq_completed[1] = 0;
return count;
}
static ssize_t ctx_completed_write(struct file *file, const char __user *buf,
static int blk_mq_debugfs_show(struct seq_file *m, void *v)
{
const struct blk_mq_debugfs_attr *attr = m->private;
void *data = d_inode(m->file->f_path.dentry->d_parent)->i_private;
return attr->show(data, m);
}
static ssize_t blk_mq_debugfs_write(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
struct seq_file *m = file->private_data;
struct blk_mq_ctx *ctx = m->private;
const struct blk_mq_debugfs_attr *attr = m->private;
void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
ctx->rq_completed[0] = ctx->rq_completed[1] = 0;
return count;
if (!attr->write)
return -EPERM;
return attr->write(data, buf, count, ppos);
}
static int blk_mq_debugfs_open(struct inode *inode, struct file *file)
{
const struct blk_mq_debugfs_attr *attr = inode->i_private;
void *data = d_inode(file->f_path.dentry->d_parent)->i_private;
struct seq_file *m;
int ret;
if (attr->seq_ops) {
ret = seq_open(file, attr->seq_ops);
if (!ret) {
m = file->private_data;
m->private = data;
}
return ret;
}
if (WARN_ON_ONCE(!attr->show))
return -EPERM;
return single_open(file, blk_mq_debugfs_show, inode->i_private);
}
static const struct file_operations ctx_completed_fops = {
.open = ctx_completed_open,
static int blk_mq_debugfs_release(struct inode *inode, struct file *file)
{
const struct blk_mq_debugfs_attr *attr = inode->i_private;
if (attr->show)
return single_release(inode, file);
else
return seq_release(inode, file);
}
const struct file_operations blk_mq_debugfs_fops = {
.open = blk_mq_debugfs_open,
.read = seq_read,
.write = ctx_completed_write,
.write = blk_mq_debugfs_write,
.llseek = seq_lseek,
.release = single_release,
.release = blk_mq_debugfs_release,
};
static const struct blk_mq_debugfs_attr blk_mq_debugfs_queue_attrs[] = {
{"poll_stat", 0400, &queue_poll_stat_fops},
{"state", 0600, &blk_queue_flags_fops},
{"poll_stat", 0400, queue_poll_stat_show},
{"state", 0600, queue_state_show, queue_state_write},
{},
};
static const struct blk_mq_debugfs_attr blk_mq_debugfs_hctx_attrs[] = {
{"state", 0400, &hctx_state_fops},
{"flags", 0400, &hctx_flags_fops},
{"dispatch", 0400, &hctx_dispatch_fops},
{"ctx_map", 0400, &hctx_ctx_map_fops},
{"tags", 0400, &hctx_tags_fops},
{"tags_bitmap", 0400, &hctx_tags_bitmap_fops},
{"sched_tags", 0400, &hctx_sched_tags_fops},
{"sched_tags_bitmap", 0400, &hctx_sched_tags_bitmap_fops},
{"io_poll", 0600, &hctx_io_poll_fops},
{"dispatched", 0600, &hctx_dispatched_fops},
{"queued", 0600, &hctx_queued_fops},
{"run", 0600, &hctx_run_fops},
{"active", 0400, &hctx_active_fops},
{"state", 0400, hctx_state_show},
{"flags", 0400, hctx_flags_show},
{"dispatch", 0400, .seq_ops = &hctx_dispatch_seq_ops},
{"ctx_map", 0400, hctx_ctx_map_show},
{"tags", 0400, hctx_tags_show},
{"tags_bitmap", 0400, hctx_tags_bitmap_show},
{"sched_tags", 0400, hctx_sched_tags_show},
{"sched_tags_bitmap", 0400, hctx_sched_tags_bitmap_show},
{"io_poll", 0600, hctx_io_poll_show, hctx_io_poll_write},
{"dispatched", 0600, hctx_dispatched_show, hctx_dispatched_write},
{"queued", 0600, hctx_queued_show, hctx_queued_write},
{"run", 0600, hctx_run_show, hctx_run_write},
{"active", 0400, hctx_active_show},
{},
};
static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = {
{"rq_list", 0400, &ctx_rq_list_fops},
{"dispatched", 0600, &ctx_dispatched_fops},
{"merged", 0600, &ctx_merged_fops},
{"completed", 0600, &ctx_completed_fops},
{"rq_list", 0400, .seq_ops = &ctx_rq_list_seq_ops},
{"dispatched", 0600, ctx_dispatched_show, ctx_dispatched_write},
{"merged", 0600, ctx_merged_show, ctx_merged_write},
{"completed", 0600, ctx_completed_show, ctx_completed_write},
{},
};
......@@ -902,9 +708,11 @@ void blk_mq_debugfs_unregister(struct request_queue *q)
static bool debugfs_create_files(struct dentry *parent, void *data,
const struct blk_mq_debugfs_attr *attr)
{
d_inode(parent)->i_private = data;
for (; attr->name; attr++) {
if (!debugfs_create_file(attr->name, attr->mode, parent,
data, attr->fops))
(void *)attr, &blk_mq_debugfs_fops))
return false;
}
return true;
......
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