bybrooklyn/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-04-18 06:44:00 -04:00
Code Issues Packages Projects Releases Wiki Activity

io_uring: move remaining file table manipulation to filetable.c

Browse Source 
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Jens Axboe
2022-05-26 09:44:31 -06:00
parent 7357298448
commit c98817e6cd
4 changed files with 90 additions and 88 deletions
Download Patch File Download Diff File Expand all files Collapse all files

87
io_uring/filetable.c
View File

@@ -4,14 +4,17 @@
#include <linux/file.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/nospec.h>
#include <linux/io_uring.h>
#include <uapi/linux/io_uring.h>
#include "io_uring_types.h"
#include "io_uring.h"
#include "rsrc.h"
#include "filetable.h"
int io_file_bitmap_get(struct io_ring_ctx *ctx)
static int io_file_bitmap_get(struct io_ring_ctx *ctx)
{
struct io_file_table *table = &ctx->file_table;
unsigned long nr = ctx->nr_user_files;
@@ -55,3 +58,85 @@ void io_free_file_tables(struct io_file_table *table)
table->files = NULL;
table->bitmap = NULL;
}
static int io_install_fixed_file(struct io_kiocb *req, struct file *file,
unsigned int issue_flags, u32 slot_index)
__must_hold(&req->ctx->uring_lock)
{
struct io_ring_ctx *ctx = req->ctx;
bool needs_switch = false;
struct io_fixed_file *file_slot;
int ret;
if (io_is_uring_fops(file))
return -EBADF;
if (!ctx->file_data)
return -ENXIO;
if (slot_index >= ctx->nr_user_files)
return -EINVAL;
slot_index = array_index_nospec(slot_index, ctx->nr_user_files);
file_slot = io_fixed_file_slot(&ctx->file_table, slot_index);
if (file_slot->file_ptr) {
struct file *old_file;
ret = io_rsrc_node_switch_start(ctx);
if (ret)
goto err;
old_file = (struct file *)(file_slot->file_ptr & FFS_MASK);
ret = io_queue_rsrc_removal(ctx->file_data, slot_index,
ctx->rsrc_node, old_file);
if (ret)
goto err;
file_slot->file_ptr = 0;
io_file_bitmap_clear(&ctx->file_table, slot_index);
needs_switch = true;
}
ret = io_scm_file_account(ctx, file);
if (!ret) {
*io_get_tag_slot(ctx->file_data, slot_index) = 0;
io_fixed_file_set(file_slot, file);
io_file_bitmap_set(&ctx->file_table, slot_index);
}
err:
if (needs_switch)
io_rsrc_node_switch(ctx, ctx->file_data);
if (ret)
fput(file);
return ret;
}
/*
* Note when io_fixed_fd_install() returns error value, it will ensure
* fput() is called correspondingly.
*/
int io_fixed_fd_install(struct io_kiocb *req, unsigned int issue_flags,
struct file *file, unsigned int file_slot)
{
bool alloc_slot = file_slot == IORING_FILE_INDEX_ALLOC;
struct io_ring_ctx *ctx = req->ctx;
int ret;
io_ring_submit_lock(ctx, issue_flags);
if (alloc_slot) {
ret = io_file_bitmap_get(ctx);
if (unlikely(ret < 0))
goto err;
file_slot = ret;
} else {
file_slot--;
}
ret = io_install_fixed_file(req, file, issue_flags, file_slot);
if (!ret && alloc_slot)
ret = file_slot;
err:
io_ring_submit_unlock(ctx, issue_flags);
if (unlikely(ret < 0))
fput(file);
return ret;
}