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io_uring/rsrc: pass 'struct io_ring_ctx' reference to rsrc helpers

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`io_rsrc_node` instance won't be shared among different io_uring ctxs,
and its allocation 'ctx' is always same with the user's 'ctx', so it is
safe to pass user 'ctx' reference to rsrc helpers. Even in io_clone_buffers(),
`io_rsrc_node` instance is allocated actually for destination io_uring_ctx.

Then io_rsrc_node_ctx() can be removed, and the 8 bytes `ctx` pointer will be
removed from `io_rsrc_node` in the following patch.

Signed-off-by: Ming Lei <ming.lei@redhat.com>
Link: https://lore.kernel.org/r/20241107110149.890530-2-ming.lei@redhat.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Ming Lei 2024-11-07 19:01:34 +08:00 committed by Jens Axboe
parent af0a2ffef0
commit 0d98c50908
5 changed files with 30 additions and 35 deletions
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13
io_uring/filetable.c
View File

@ -36,20 +36,21 @@ static int io_file_bitmap_get(struct io_ring_ctx *ctx)
return -ENFILE;
}
bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files)
bool io_alloc_file_tables(struct io_ring_ctx *ctx, struct io_file_table *table,
unsigned nr_files)
{
if (io_rsrc_data_alloc(&table->data, nr_files))
return false;
table->bitmap = bitmap_zalloc(nr_files, GFP_KERNEL_ACCOUNT);
if (table->bitmap)
return true;
io_rsrc_data_free(&table->data);
io_rsrc_data_free(ctx, &table->data);
return false;
}
void io_free_file_tables(struct io_file_table *table)
void io_free_file_tables(struct io_ring_ctx *ctx, struct io_file_table *table)
{
io_rsrc_data_free(&table->data);
io_rsrc_data_free(ctx, &table->data);
bitmap_free(table->bitmap);
table->bitmap = NULL;
}
@ -71,7 +72,7 @@ static int io_install_fixed_file(struct io_ring_ctx *ctx, struct file *file,
if (!node)
return -ENOMEM;
if (!io_reset_rsrc_node(&ctx->file_table.data, slot_index))
if (!io_reset_rsrc_node(ctx, &ctx->file_table.data, slot_index))
io_file_bitmap_set(&ctx->file_table, slot_index);
ctx->file_table.data.nodes[slot_index] = node;
@ -130,7 +131,7 @@ int io_fixed_fd_remove(struct io_ring_ctx *ctx, unsigned int offset)
node = io_rsrc_node_lookup(&ctx->file_table.data, offset);
if (!node)
return -EBADF;
io_reset_rsrc_node(&ctx->file_table.data, offset);
io_reset_rsrc_node(ctx, &ctx->file_table.data, offset);
io_file_bitmap_clear(&ctx->file_table, offset);
return 0;
}

4
io_uring/filetable.h
View File

@ -6,8 +6,8 @@
#include <linux/io_uring_types.h>
#include "rsrc.h"
bool io_alloc_file_tables(struct io_file_table *table, unsigned nr_files);
void io_free_file_tables(struct io_file_table *table);
bool io_alloc_file_tables(struct io_ring_ctx *ctx, struct io_file_table *table, unsigned nr_files);
void io_free_file_tables(struct io_ring_ctx *ctx, struct io_file_table *table);
int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
struct file *file, unsigned int file_slot);

24
io_uring/rsrc.c
View File

@ -130,13 +130,13 @@ struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx, int type)
return node;
}
__cold void io_rsrc_data_free(struct io_rsrc_data *data)
__cold void io_rsrc_data_free(struct io_ring_ctx *ctx, struct io_rsrc_data *data)
{
if (!data->nr)
return;
while (data->nr--) {
if (data->nodes[data->nr])
io_put_rsrc_node(data->nodes[data->nr]);
io_put_rsrc_node(ctx, data->nodes[data->nr]);
}
kvfree(data->nodes);
data->nodes = NULL;
@ -184,7 +184,7 @@ static int __io_sqe_files_update(struct io_ring_ctx *ctx,
continue;
i = up->offset + done;
if (io_reset_rsrc_node(&ctx->file_table.data, i))
if (io_reset_rsrc_node(ctx, &ctx->file_table.data, i))
io_file_bitmap_clear(&ctx->file_table, i);
if (fd != -1) {
@ -266,7 +266,7 @@ static int __io_sqe_buffers_update(struct io_ring_ctx *ctx,
node->tag = tag;
}
i = array_index_nospec(up->offset + done, ctx->buf_table.nr);
io_reset_rsrc_node(&ctx->buf_table, i);
io_reset_rsrc_node(ctx, &ctx->buf_table, i);
ctx->buf_table.nodes[i] = node;
if (ctx->compat)
user_data += sizeof(struct compat_iovec);
@ -442,10 +442,8 @@ int io_files_update(struct io_kiocb *req, unsigned int issue_flags)
return IOU_OK;
}
void io_free_rsrc_node(struct io_rsrc_node *node)
void io_free_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
{
struct io_ring_ctx *ctx = io_rsrc_node_ctx(node);
lockdep_assert_held(&ctx->uring_lock);
if (node->tag)
@ -473,7 +471,7 @@ int io_sqe_files_unregister(struct io_ring_ctx *ctx)
if (!ctx->file_table.data.nr)
return -ENXIO;
io_free_file_tables(&ctx->file_table);
io_free_file_tables(ctx, &ctx->file_table);
io_file_table_set_alloc_range(ctx, 0, 0);
return 0;
}
@ -494,7 +492,7 @@ int io_sqe_files_register(struct io_ring_ctx *ctx, void __user *arg,
return -EMFILE;
if (nr_args > rlimit(RLIMIT_NOFILE))
return -EMFILE;
if (!io_alloc_file_tables(&ctx->file_table, nr_args))
if (!io_alloc_file_tables(ctx, &ctx->file_table, nr_args))
return -ENOMEM;
for (i = 0; i < nr_args; i++) {
@ -551,7 +549,7 @@ int io_sqe_buffers_unregister(struct io_ring_ctx *ctx)
{
if (!ctx->buf_table.nr)
return -ENXIO;
io_rsrc_data_free(&ctx->buf_table);
io_rsrc_data_free(ctx, &ctx->buf_table);
return 0;
}
@ -788,7 +786,7 @@ static struct io_rsrc_node *io_sqe_buffer_register(struct io_ring_ctx *ctx,
if (ret) {
kvfree(imu);
if (node)
io_put_rsrc_node(node);
io_put_rsrc_node(ctx, node);
node = ERR_PTR(ret);
}
kvfree(pages);
@ -1018,7 +1016,7 @@ static int io_clone_buffers(struct io_ring_ctx *ctx, struct io_ring_ctx *src_ctx
* old and new nodes at this point.
*/
if (arg->flags & IORING_REGISTER_DST_REPLACE)
io_rsrc_data_free(&ctx->buf_table);
io_rsrc_data_free(ctx, &ctx->buf_table);
/*
* ctx->buf_table should be empty now - either the contents are being
@ -1042,7 +1040,7 @@ static int io_clone_buffers(struct io_ring_ctx *ctx, struct io_ring_ctx *src_ctx
kfree(data.nodes[i]);
}
out_unlock:
io_rsrc_data_free(&data);
io_rsrc_data_free(ctx, &data);
mutex_unlock(&src_ctx->uring_lock);
mutex_lock(&ctx->uring_lock);
return ret;

22
io_uring/rsrc.h
View File

@ -45,8 +45,8 @@ struct io_imu_folio_data {
};
struct io_rsrc_node *io_rsrc_node_alloc(struct io_ring_ctx *ctx, int type);
void io_free_rsrc_node(struct io_rsrc_node *node);
void io_rsrc_data_free(struct io_rsrc_data *data);
void io_free_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node);
void io_rsrc_data_free(struct io_ring_ctx *ctx, struct io_rsrc_data *data);
int io_rsrc_data_alloc(struct io_rsrc_data *data, unsigned nr);
int io_import_fixed(int ddir, struct iov_iter *iter,
@ -76,19 +76,20 @@ static inline struct io_rsrc_node *io_rsrc_node_lookup(struct io_rsrc_data *data
return NULL;
}
static inline void io_put_rsrc_node(struct io_rsrc_node *node)
static inline void io_put_rsrc_node(struct io_ring_ctx *ctx, struct io_rsrc_node *node)
{
if (node && !--node->refs)
io_free_rsrc_node(node);
io_free_rsrc_node(ctx, node);
}
static inline bool io_reset_rsrc_node(struct io_rsrc_data *data, int index)
static inline bool io_reset_rsrc_node(struct io_ring_ctx *ctx,
struct io_rsrc_data *data, int index)
{
struct io_rsrc_node *node = data->nodes[index];
if (!node)
return false;
io_put_rsrc_node(node);
io_put_rsrc_node(ctx, node);
data->nodes[index] = NULL;
return true;
}
@ -96,20 +97,15 @@ static inline bool io_reset_rsrc_node(struct io_rsrc_data *data, int index)
static inline void io_req_put_rsrc_nodes(struct io_kiocb *req)
{
if (req->file_node) {
io_put_rsrc_node(req->file_node);
io_put_rsrc_node(req->ctx, req->file_node);
req->file_node = NULL;
}
if (req->flags & REQ_F_BUF_NODE) {
io_put_rsrc_node(req->buf_node);
io_put_rsrc_node(req->ctx, req->buf_node);
req->buf_node = NULL;
}
}
static inline struct io_ring_ctx *io_rsrc_node_ctx(struct io_rsrc_node *node)
{
return (struct io_ring_ctx *) (node->ctx_ptr & ~IORING_RSRC_TYPE_MASK);
}
static inline int io_rsrc_node_type(struct io_rsrc_node *node)
{
return node->ctx_ptr & IORING_RSRC_TYPE_MASK;

2
io_uring/splice.c
View File

@ -51,7 +51,7 @@ void io_splice_cleanup(struct io_kiocb *req)
{
struct io_splice *sp = io_kiocb_to_cmd(req, struct io_splice);
io_put_rsrc_node(sp->rsrc_node);
io_put_rsrc_node(req->ctx, sp->rsrc_node);
}
static struct file *io_splice_get_file(struct io_kiocb *req,