->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@xxxxxxxxx>
---
include/linux/io_uring_types.h | 2 +-
io_uring/io_uring.c | 2 +-
io_uring/memmap.c | 6 +++---
io_uring/register.c | 8 ++++----
4 files changed, 9 insertions(+), 9 deletions(-)
diff --git a/include/linux/io_uring_types.h b/include/linux/io_uring_types.h
index aa5f5ea98076..ac7b2b6484a9 100644
--- a/include/linux/io_uring_types.h
+++ b/include/linux/io_uring_types.h
@@ -422,7 +422,7 @@ 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 da8fd460977b..d565b1589951 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 3d71756bc598..771a57a4a16b 100644
--- a/io_uring/memmap.c
+++ b/io_uring/memmap.c
@@ -322,7 +322,7 @@ __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))
@@ -358,7 +358,7 @@ 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))
@@ -408,7 +408,7 @@ 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 1e99c783abdf..ba61697d7a53 100644
--- a/io_uring/register.c
+++ b/io_uring/register.c
@@ -486,15 +486,15 @@ 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;
@@ -561,7 +561,7 @@ static int io_register_resize_rings(struct io_ring_ctx *ctx, void __user *arg)
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)
--
2.46.0
