diff options
author | Omar Sandoval <osandov@fb.com> | 2017-01-25 08:06:42 -0800 |
---|---|---|
committer | Jens Axboe <axboe@fb.com> | 2017-01-27 08:17:44 -0700 |
commit | 950cd7e9ffdc44c340b8914126b39cc079f0c844 (patch) | |
tree | a9f4e5fc7958b798e9cdb30da733c20b0f9af268 /block/blk-mq-debugfs.c | |
parent | 9abb2ad21e8b9b7a2555411fbee225a508cf962d (diff) | |
download | linux-950cd7e9ffdc44c340b8914126b39cc079f0c844.tar.bz2 |
blk-mq: move hctx->dispatch and ctx->rq_list from sysfs to debugfs
These lists are only useful for debugging; they definitely don't belong
in sysfs. Putting them in debugfs also removes the limitation of a
single page of output.
Reviewed-by: Hannes Reinecke <hare@suse.com>
Signed-off-by: Omar Sandoval <osandov@fb.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
Diffstat (limited to 'block/blk-mq-debugfs.c')
-rw-r--r-- | block/blk-mq-debugfs.c | 106 |
1 files changed, 106 insertions, 0 deletions
diff --git a/block/blk-mq-debugfs.c b/block/blk-mq-debugfs.c index 0c14511fa9e0..1967c06d80e0 100644 --- a/block/blk-mq-debugfs.c +++ b/block/blk-mq-debugfs.c @@ -29,6 +29,20 @@ struct blk_mq_debugfs_attr { static struct dentry *block_debugfs_root; +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 hctx_state_show(struct seq_file *m, void *v) { struct blk_mq_hw_ctx *hctx = m->private; @@ -69,12 +83,104 @@ static const struct file_operations hctx_flags_fops = { .release = single_release, }; +static int blk_mq_debugfs_rq_show(struct seq_file *m, void *v) +{ + struct request *rq = list_entry_rq(v); + + seq_printf(m, "%p\n", rq); + return 0; +} + +static void *hctx_dispatch_start(struct seq_file *m, loff_t *pos) +{ + struct blk_mq_hw_ctx *hctx = m->private; + + spin_lock(&hctx->lock); + return seq_list_start(&hctx->dispatch, *pos); +} + +static void *hctx_dispatch_next(struct seq_file *m, void *v, loff_t *pos) +{ + struct blk_mq_hw_ctx *hctx = m->private; + + return seq_list_next(v, &hctx->dispatch, pos); +} + +static void hctx_dispatch_stop(struct seq_file *m, void *v) +{ + struct blk_mq_hw_ctx *hctx = m->private; + + spin_unlock(&hctx->lock); +} + +static const struct seq_operations hctx_dispatch_seq_ops = { + .start = hctx_dispatch_start, + .next = hctx_dispatch_next, + .stop = hctx_dispatch_stop, + .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 void *ctx_rq_list_start(struct seq_file *m, loff_t *pos) +{ + struct blk_mq_ctx *ctx = m->private; + + spin_lock(&ctx->lock); + return seq_list_start(&ctx->rq_list, *pos); +} + +static void *ctx_rq_list_next(struct seq_file *m, void *v, loff_t *pos) +{ + struct blk_mq_ctx *ctx = m->private; + + return seq_list_next(v, &ctx->rq_list, pos); +} + +static void ctx_rq_list_stop(struct seq_file *m, void *v) +{ + struct blk_mq_ctx *ctx = m->private; + + spin_unlock(&ctx->lock); +} + +static const struct seq_operations ctx_rq_list_seq_ops = { + .start = ctx_rq_list_start, + .next = ctx_rq_list_next, + .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 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}, }; static const struct blk_mq_debugfs_attr blk_mq_debugfs_ctx_attrs[] = { + {"rq_list", 0400, &ctx_rq_list_fops}, }; int blk_mq_debugfs_register(struct request_queue *q, const char *name) |