diff options
Diffstat (limited to 'fs')
| -rw-r--r-- | fs/bio.c | 61 | ||||
| -rw-r--r-- | fs/ioprio.c | 2 | ||||
| -rw-r--r-- | fs/splice.c | 4 |
3 files changed, 64 insertions, 3 deletions
@@ -19,12 +19,14 @@ #include <linux/swap.h> #include <linux/bio.h> #include <linux/blkdev.h> +#include <linux/iocontext.h> #include <linux/slab.h> #include <linux/init.h> #include <linux/kernel.h> #include <linux/export.h> #include <linux/mempool.h> #include <linux/workqueue.h> +#include <linux/cgroup.h> #include <scsi/sg.h> /* for struct sg_iovec */ #include <trace/events/block.h> @@ -418,6 +420,7 @@ void bio_put(struct bio *bio) * last put frees it */ if (atomic_dec_and_test(&bio->bi_cnt)) { + bio_disassociate_task(bio); bio->bi_next = NULL; bio->bi_destructor(bio); } @@ -1646,6 +1649,64 @@ bad: } EXPORT_SYMBOL(bioset_create); +#ifdef CONFIG_BLK_CGROUP +/** + * bio_associate_current - associate a bio with %current + * @bio: target bio + * + * Associate @bio with %current if it hasn't been associated yet. Block + * layer will treat @bio as if it were issued by %current no matter which + * task actually issues it. + * + * This function takes an extra reference of @task's io_context and blkcg + * which will be put when @bio is released. The caller must own @bio, + * ensure %current->io_context exists, and is responsible for synchronizing + * calls to this function. + */ +int bio_associate_current(struct bio *bio) +{ + struct io_context *ioc; + struct cgroup_subsys_state *css; + + if (bio->bi_ioc) + return -EBUSY; + + ioc = current->io_context; + if (!ioc) + return -ENOENT; + + /* acquire active ref on @ioc and associate */ + get_io_context_active(ioc); + bio->bi_ioc = ioc; + + /* associate blkcg if exists */ + rcu_read_lock(); + css = task_subsys_state(current, blkio_subsys_id); + if (css && css_tryget(css)) + bio->bi_css = css; + rcu_read_unlock(); + + return 0; +} + +/** + * bio_disassociate_task - undo bio_associate_current() + * @bio: target bio + */ +void bio_disassociate_task(struct bio *bio) +{ + if (bio->bi_ioc) { + put_io_context(bio->bi_ioc); + bio->bi_ioc = NULL; + } + if (bio->bi_css) { + css_put(bio->bi_css); + bio->bi_css = NULL; + } +} + +#endif /* CONFIG_BLK_CGROUP */ + static void __init biovec_init_slabs(void) { int i; diff --git a/fs/ioprio.c b/fs/ioprio.c index 5e6dbe8958fc..e50170ca7c33 100644 --- a/fs/ioprio.c +++ b/fs/ioprio.c @@ -50,7 +50,7 @@ int set_task_ioprio(struct task_struct *task, int ioprio) ioc = get_task_io_context(task, GFP_ATOMIC, NUMA_NO_NODE); if (ioc) { - ioc_ioprio_changed(ioc, ioprio); + ioc->ioprio = ioprio; put_io_context(ioc); } diff --git a/fs/splice.c b/fs/splice.c index f8476841eb04..406ef2b792c2 100644 --- a/fs/splice.c +++ b/fs/splice.c @@ -1388,7 +1388,7 @@ static long do_splice(struct file *in, loff_t __user *off_in, */ static int get_iovec_page_array(const struct iovec __user *iov, unsigned int nr_vecs, struct page **pages, - struct partial_page *partial, int aligned, + struct partial_page *partial, bool aligned, unsigned int pipe_buffers) { int buffers = 0, error = 0; @@ -1626,7 +1626,7 @@ static long vmsplice_to_pipe(struct file *file, const struct iovec __user *iov, return -ENOMEM; spd.nr_pages = get_iovec_page_array(iov, nr_segs, spd.pages, - spd.partial, flags & SPLICE_F_GIFT, + spd.partial, false, pipe->buffers); if (spd.nr_pages <= 0) ret = spd.nr_pages; |