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io_uring/kbuf: remove obsolete buf_nr_pages and update comments 

The buf_nr_pages field in io_buffer_list was previously used to
determine whether the buffer list uses ring-provided buffers or classic
provided buffers. This is now determined by checking the IOBL_BUF_RING
flag.

Remove the buf_nr_pages field and update related comments.

Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Joanne Koong 2025-11-20 11:15:56 -08:00 committed by Jens Axboe
parent f779ac0b87
commit 84692a1519
2 changed files with 4 additions and 5 deletions
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4
include/linux/io_uring_types.h
View File

@ -327,8 +327,8 @@ struct io_ring_ctx {
/* /*
* Modifications are protected by ->uring_lock and ->mmap_lock. * Modifications are protected by ->uring_lock and ->mmap_lock.
* The flags, buf_pages and buf_nr_pages fields should be stable * The buffer list's io mapped region should be stable once
* once published. * published.
*/ */
struct xarray io_bl_xa; struct xarray io_bl_xa;

5
io_uring/kbuf.h
View File

@ -14,8 +14,8 @@ enum {
struct io_buffer_list { struct io_buffer_list {
/* /*
* If ->buf_nr_pages is set, then buf_pages/buf_ring are used. If not, * If the IOBL_BUF_RING flag is set, then buf_ring is used. If not, then
* then these are classic provided buffers and ->buf_list is used. * these are classic provided buffers and ->buf_list is used.
*/ */
union { union {
struct list_head buf_list; struct list_head buf_list;
@ -27,7 +27,6 @@ struct io_buffer_list {
__u16 bgid; __u16 bgid;
/* below is for ring provided buffers */ /* below is for ring provided buffers */
__u16 buf_nr_pages;
__u16 nr_entries; __u16 nr_entries;
__u16 head; __u16 head;
__u16 mask; __u16 mask;