io_uring: rename ->resize_lock

->resize_lock is used for resizing rings, but it's a good idea to reuse
it in other cases as well. Rename it into mmap_lock as it's protects
from races with mmap.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/68f705306f3ac4d2fb999eb80ea1615015ce9f7f.1732886067.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

4 files changed, 9 insertions, 9 deletions

diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h
index fd4cdb0860a2..fafc1d779eb1 100644
--- a/include/linux/io_uring_types.h
+++ b/include/linux/io_uring_types.h
@@ -424,7 +424,7 @@ struct io_ring_ctx {
 	 * side will need to grab this lock, to prevent either side from
 	 * being run concurrently with the other.
 	 */
-	struct mutex			resize_lock;
+	struct mutex			mmap_lock;
 
 	/*
 	 * If IORING_SETUP_NO_MMAP is used, then the below holds
diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index d3403c8216db..539fecde0244 100644
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -350,7 +350,7 @@ static __cold struct io_ring_ctx *io_ring_ctx_alloc(struct io_uring_params *p)
 	INIT_WQ_LIST(&ctx->submit_state.compl_reqs);
 	INIT_HLIST_HEAD(&ctx->cancelable_uring_cmd);
 	io_napi_init(ctx);
-	mutex_init(&ctx->resize_lock);
+	mutex_init(&ctx->mmap_lock);
 
 	return ctx;
 
diff --git a/io_uring/memmap.c b/io_uring/memmap.c
index 57de9bccbf50..a0d4151d11af 100644
--- a/io_uring/memmap.c
+++ b/io_uring/memmap.c
@@ -329,7 +329,7 @@ __cold int io_uring_mmap(struct file *file, struct vm_area_struct *vma)
 	unsigned int npages;
 	void *ptr;
 
-	guard(mutex)(&ctx->resize_lock);
+	guard(mutex)(&ctx->mmap_lock);
 
 	ptr = io_uring_validate_mmap_request(file, vma->vm_pgoff, sz);
 	if (IS_ERR(ptr))
@@ -365,7 +365,7 @@ unsigned long io_uring_get_unmapped_area(struct file *filp, unsigned long addr,
 	if (addr)
 		return -EINVAL;
 
-	guard(mutex)(&ctx->resize_lock);
+	guard(mutex)(&ctx->mmap_lock);
 
 	ptr = io_uring_validate_mmap_request(filp, pgoff, len);
 	if (IS_ERR(ptr))
@@ -415,7 +415,7 @@ unsigned long io_uring_get_unmapped_area(struct file *file, unsigned long addr,
 	struct io_ring_ctx *ctx = file->private_data;
 	void *ptr;
 
-	guard(mutex)(&ctx->resize_lock);
+	guard(mutex)(&ctx->mmap_lock);
 
 	ptr = io_uring_validate_mmap_request(file, pgoff, len);
 	if (IS_ERR(ptr))
diff --git a/io_uring/register.c b/io_uring/register.c
index fdd44914c39c..77743e3f6751 100644
--- a/io_uring/register.c
+++ b/io_uring/register.c
@@ -489,15 +489,15 @@ static int io_register_resize_rings(struct io_ring_ctx *ctx, void __user *arg)
 	}
 
 	/*
-	 * We'll do the swap. Grab the ctx->resize_lock, which will exclude
+	 * We'll do the swap. Grab the ctx->mmap_lock, which will exclude
 	 * any new mmap's on the ring fd. Clear out existing mappings to prevent
 	 * mmap from seeing them, as we'll unmap them. Any attempt to mmap
 	 * existing rings beyond this point will fail. Not that it could proceed
 	 * at this point anyway, as the io_uring mmap side needs go grab the
-	 * ctx->resize_lock as well. Likewise, hold the completion lock over the
+	 * ctx->mmap_lock as well. Likewise, hold the completion lock over the
 	 * duration of the actual swap.
 	 */
-	mutex_lock(&ctx->resize_lock);
+	mutex_lock(&ctx->mmap_lock);
 	spin_lock(&ctx->completion_lock);
 	o.rings = ctx->rings;
 	ctx->rings = NULL;
@@ -564,7 +564,7 @@ overflow:
 	ret = 0;
 out:
 	spin_unlock(&ctx->completion_lock);
-	mutex_unlock(&ctx->resize_lock);
+	mutex_unlock(&ctx->mmap_lock);
 	io_register_free_rings(&p, to_free);
 
 	if (ctx->sq_data)